EP3119542A1 - Shaft holding sleeve, shaft diameter enlarging apparatus and jig for shaft diameter enlarging apparatus - Google Patents
Shaft holding sleeve, shaft diameter enlarging apparatus and jig for shaft diameter enlarging apparatusInfo
- Publication number
- EP3119542A1 EP3119542A1 EP15714685.3A EP15714685A EP3119542A1 EP 3119542 A1 EP3119542 A1 EP 3119542A1 EP 15714685 A EP15714685 A EP 15714685A EP 3119542 A1 EP3119542 A1 EP 3119542A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- shaft
- shaft holding
- sleeve
- holding sleeve
- stock
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
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- 238000003780 insertion Methods 0.000 abstract description 7
- 230000037431 insertion Effects 0.000 abstract description 7
- 238000000576 coating method Methods 0.000 description 13
- 239000011248 coating agent Substances 0.000 description 12
- 239000000463 material Substances 0.000 description 11
- 238000005452 bending Methods 0.000 description 8
- 238000010586 diagram Methods 0.000 description 8
- 229910000997 High-speed steel Inorganic materials 0.000 description 7
- 235000019589 hardness Nutrition 0.000 description 7
- 229910052751 metal Inorganic materials 0.000 description 6
- 239000002184 metal Substances 0.000 description 6
- INZDTEICWPZYJM-UHFFFAOYSA-N 1-(chloromethyl)-4-[4-(chloromethyl)phenyl]benzene Chemical compound C1=CC(CCl)=CC=C1C1=CC=C(CCl)C=C1 INZDTEICWPZYJM-UHFFFAOYSA-N 0.000 description 3
- 238000011156 evaluation Methods 0.000 description 3
- 238000005121 nitriding Methods 0.000 description 3
- 230000004323 axial length Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000005229 chemical vapour deposition Methods 0.000 description 2
- 238000007654 immersion Methods 0.000 description 2
- 230000010355 oscillation Effects 0.000 description 2
- 238000005240 physical vapour deposition Methods 0.000 description 2
- 238000005268 plasma chemical vapour deposition Methods 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- -1 SKD11 Inorganic materials 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000011651 chromium Substances 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- VKYKSIONXSXAKP-UHFFFAOYSA-N hexamethylenetetramine Chemical compound C1N(C2)CN3CN1CN2C3 VKYKSIONXSXAKP-UHFFFAOYSA-N 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 230000003746 surface roughness Effects 0.000 description 1
- 230000008961 swelling Effects 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
- B21J5/06—Methods for forging, hammering, or pressing; Special equipment or accessories therefor for performing particular operations
- B21J5/08—Upsetting
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J13/00—Details of machines for forging, pressing, or hammering
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
- B21K1/00—Making machine elements
- B21K1/06—Making machine elements axles or shafts
- B21K1/12—Making machine elements axles or shafts of specially-shaped cross-section
Definitions
- the present invention relates to a shaft holding sleeve, a shaft diameter enlarging apparatus and a jig for the shaft diameter enlarging apparatus.
- a shaft diameter enlarging method is known as a method for forming a large diameter portion on an axially intermediate portion of a shaft stock.
- a shaft stock is rotated with a bending angle being given to the shaft stock in a state in which an axial compression stress is applied to the shaft stock, thereby enlarging a portion of the shaft stock to form the large diameter portion.
- a shaft diameter enlarging apparatus typically includes a pair of shaft holding sleeves for holding respective end portions of a shaft stock and a pair of spindles arranged along a reference line, along which the shaft stock is arranged.
- Each spindle has a fitting hole into which a corresponding holding sleeve is inserted.
- the shaft holding sleeves are inserted into the fitting holes of the respective spindles and fixed to the respective spindles.
- a portion of the shaft stock is enlarged by moving one of the spindles along the reference line to compress the shaft stock in the axial direction thereof and by simultaneously rotating the other spindle in a state in which the other spindle is tilted relative to the reference line (see, e.g., JP2013- 166168 A).
- the shaft holding sleeve is exchanged as needed in accordance with, for example, dimensions of shaft stocks or wearing of the shaft holding sleeve due to contact with the shaft stock.
- the air confined inside the fitting hole may hinder a smooth insertion or removal of the shaft holding sleeve.
- the shaft holding sleeve may include an outer sleeve fixed to the spindle and an inner sleeve press-fitted in the outer sleeve so that only the inner sleeve need to be exchanged.
- the inner sleeve is worn due to contact with the shaft stock. Thus, costs can be reduced by exchanging only the inner sleeve.
- the inner sleeve contacts a radially enlarged portion of the shaft stock, and thus as the shaft stock is compressed, a load is exerted on the inner sleeve in a direction opposite to a compression direction in which the shaft stock is compressed. If the load exerted on the inner sleeve is excessive, the inner sleeve may be displaced relative to the outer sleeve in the direction opposite to the compression direction.
- the present invention has been made in view of above, and it is an object thereof to improve a shaft diameter enlarging work.
- a shaft holding sleeve is inserted in a fitting hole of a compressing machine that applies an axial compression stress to a shaft stock to hold an end portion of the shaft stock during a shaft diameter enlarging process for radially enlarging a portion of the shaft stock.
- the shaft holding sleeve includes a front end surface to be inserted in the fitting hole, an exposed portion to be exposed to an outside of the fitting hole, and at least one air communication passage extending from the front end surface to a surface of the exposed portion.
- a shaft diameter enlarging apparatus includes a pair of shaft holding sleeves described above to hold respective end portions of a shaft stock, a compressing machine having fitting holes into which the pair of shaft holding sleeves are inserted respectively, the compressing machine being configured to compress the shaft stock W having the respective end portions held by the pair of shaft holding sleeves in an axial direction of the shaft stock, and a load generation device configured to apply, to an intermediate portion of the shaft stock having the respective end portions held by the pair of shaft holding sleeves, an alternating load in a direction intersecting the axial direction.
- a jig for use with the shaft diameter enlarging apparatus described above is provided.
- the jig includes a mounting surface on which the shaft holding sleeve is mounted when inserting the shaft holding sleeve into the fitting hole. In a state in which the jig is attached to an opening edge portion of the fitting hole, the mounting surface is flush with an inner peripheral surface of the fitting hole.
- FIGs. 1 A to IE are diagrams schematically illustrating an example of a shaft diameter enlarging method
- Figs. 2A to 2C are diagrams schematically illustrating another example of the shaft diameter enlarging method
- FIGs. 3 A and 3B are diagrams schematically illustrating yet another example of the shaft diameter enlarging method
- Figs. 4A and 4B are diagrams schematically illustrating yet another example of the shaft diameter enlarging method
- Figs. 5A and 5B are diagrams schematically illustrating yet another example of the shaft diameter enlarging method
- Fig. 6 is a side view of an example of a shaft diameter enlarging apparatus for performing the shaft diameter enlarging method illustrated in Figs. 1 A to IE;
- Fig. 7 is a sectional view of a shaft holding sleeve and a spindle of the shaft diameter enlarging apparatus of Fig. 6;
- Fig. 8 is a front view of the shaft holding sleeve of Fig. 7;
- Fig. 9 is a sectional view of another example of the shaft holding sleeve.
- Fig. 10 is a side view of yet another example of the shaft holding sleeve
- Fig. 11 is a perspective view of yet another example of the shaft holding sleeve
- Fig. 12 is a sectional view of another example of the shaft holding sleeve and the spindle;
- Fig. 13 is a diagram illustrating a configuration of the shaft holding sleeve of Fig. 12;
- Fig. 14 is a diagram illustrating a configuration of another example of the shaft holding sleeve of Fig. 12;
- Fig. 15 is a side view illustrating an example of a jig for the shaft diameter enlarging apparatus
- Fig. 16 is a sectional view illustrating another example of the jig for the shaft diameter enlarging apparatus.
- Fig. 17 is a front view of the jig for the shaft diameter enlarging apparatus of Fig. 16.
- FIGs. 1A to 5B are diagrams illustrating various examples of a shaft diameter enlarging method.
- a shaft stock W is rotated while a bending angle is applied to the shaft stock W in a state in which an axial compression stress is exerted thereon, thereby enlarging a portion of the shaft stock W.
- both end portions of the shaft stock W are respectively inserted into a pair of shaft holding sleeves la and lb arranged on a reference line A to face each other.
- both end portions of the shaft stock W are respectively abutted to bottoms of the shaft holding sleeves la and lb, and thus the shaft stock W is sandwiched by the pair of shaft holding sleeves la and lb.
- a predetermined gap D is interposed between the pair of shaft holding sleeves la and lb and the gap D is determined depending on an axial length and an outer diameter of a radially enlarged portion formed on the shaft stock W.
- the shaft holding sleeve lb is translated along the reference line A so that the shaft stock W sandwiched by the pair of shaft holding sleeves la and lb is axially compressed. Then, the shaft holding sleeve 1 a is tilted relative to the reference line A and also rotated, so that the shaft stock W sandwiched by the pair of shaft holding sleeves la and lb is bent about a bending center O on the reference line A and also is rotated about an axis of the shaft stock W.
- a shaft diameter enlarging method shown in Figs. 2A to 2C is identical to the shaft diameter enlarging method of Figs. 1A to IE, in that as a shaft stock W is bent and is rotated about an axis thereof, an alternating load is exerted on a bent portion (an intermediate portion) of the shaft stock W.
- this shaft diameter enlarging method instead of tilting one shaft holding sleeve la relative to the reference line A, the shaft holding sleeve la is slid in the direction intersecting the reference line A, thereby bending the shaft stock W.
- FIG. 6 shows a configuration of one example of a shaft diameter enlarging apparatus for performing the shaft diameter enlarging method shown in Figs. 1 A and IE.
- the shaft diameter enlarging apparatus 10 shown in Fig. 6 includes a pair of shaft holding sleeves 11 for holding end portions of a shaft stock and a pair of holder units 12a, 12b arranged to be spaced from each other along a reference line A, along which the shaft stock is arranged.
- One holder unit 12a is supported on a base 13 to be tiltable relative to the reference line A.
- the other holder unit 12b is supported on the base 13 to be movable along the reference line A.
- Each of the holder units 12a, 12b includes a spindle 14, on which the shaft holding sleeve is mounted, a housing 15 for rotatably supporting the spindle 14, and a cylinder 16 for pushing the end portion of the shaft stock, which has been inserted in the shaft holding sleeve 11, out of the shaft holding sleeve 11.
- the spindle 14 of each of the holder unit 12a, 12b is arranged on the reference line A.
- the shaft diameter enlarging apparatus 10 includes a translational driving unit 17 for moving the holder unit 12b along the reference line A, a tilting unit 18 for tilting the holder unit 12a relative to the reference line A and a rotation driving unit 19 for rotating the spindle 14 of the holder unit 12a.
- the holder units 12a, 12b and the translational driving unit 17 form a compressing machine for compressing the shaft stock in an axial direction of the shaft stock.
- the holder units 12a, 12b, the tilting unit 18 and the rotation driving unit 19 form a load generation device for exerting, on an intermediate portion of the shaft stock, an alternating load in a direction intersecting the axial direction (the reference line A) of the shaft stock.
- Figs. 7 and 8 show configurations of the shaft holding sleeve 11 and the spindle 14.
- the spindle 14 is provided with a fitting hole 20, into which the shaft holding sleeve 11 is inserted, and a pin insertion hole 21 connected to the fitting hole 20.
- a pressure receiving plate 22 for bearing the shaft holding sleeve 11 is fitted in the fitting hole 20, and the pressure receiving plate 22 is butted and fixed to a shoulder 23 formed inside the fitting hole 20.
- the pin insertion hole 21 is provided to extend through the spindle 14 along a center axis (reference line A) of the spindle 14, and a knock pin 24 of the cylinder 16 (see Fig. 6) is inserted through the pin insertion hole 21.
- the shaft holding sleeve 11 has a cylindrical portion 30 for receiving the end portion of the shaft stock and a backing metal 31 fitted in the cylindrical portion 30.
- the cylindrical portion 30 has an accommodated portion 32 received in the fitting hole 20 of the spindle 14 in a state in which the shaft holding sleeve 11 is inserted in the fitting hole 20, and an exposed portion 33 exposed out of the fitting hole 20.
- the exposed portion 33 is formed to have a diameter smaller than that of the accommodated portion 32, and a shoulder 34 is formed on a connection portion between the exposed portion 33 and the accommodated portion 32.
- the backing metal 31 forming a bottom of the shaft holding sleeve 11 is supported by the knock pin 24 and bears an end surface of the shaft stock W.
- the backing metal 31 is configured to be pressed by the knock pin 24, so that the end portion of the shaft stock W inserted in the shaft holding sleeve 11 is pushed out of the shaft holding sleeve 11.
- the shaft holding sleeve 11 inserted in the fitting hole 20 of the spindle 14 is fixed to the spindle 14 as the shoulder 34 of the cylindrical portion 30 is pressed by a flange pipe 35 fastened to an opening end of the spindle 14 in which the fitting hole 20 is opened.
- the shaft holding sleeve 11 is appropriately exchanged depending on dimensions of shaft stocks. Also, the shaft holding sleeve 11 receives a reaction force of an alternating load exerted on the shaft stock, and in particular, a relatively large load is applied to a surface 30a of an opening portion of the shaft holding sleeve 11. Accordingly, the shaft holding sleeve 11 is worn due to repeated uses and thus appropriately exchanged.
- the shaft holding sleeve 11 When along with exchange of the shaft holding sleeve 11 , the shaft holding sleeve 11 is inserted in and removed from the fitting hole 20 of the spindle 14, air is confined inside the fitting hole 20 by the shaft holding sleeve 11, the spindle 14, the pressure receiving plate 22 and the knock pin 24, and therefore the shaft holding sleeve 11 is provided with an air communication passage for communicating the inside of the fitting hole 20 with the outside.
- the air communication passage of the shaft holding sleeve 11 is composed of a groove 36 formed in an outer peripheral surface of the accommodated portion 32.
- the groove 36 is provided to extend from a front end surface of the shaft holding sleeve 11 on a side (a bottom side) of an insertion direction into the fitting hole 20 along an axial direction of the shaft holding sleeve 11 to reach a surface of the exposed portion 33.
- at least one groove 36 is sufficient as the air communication passage, a plurality of grooves may be provided to be spaced from each other in a circumferential direction of an outer surface of the accommodated portion 32 as in the shown example.
- the inside of the fitting hole 20 is at a negative pressure relative to an ambient pressure when the shaft holding sleeve 11 is removed therefrom, whereas the inside of the fitting hole 20 is at a positive pressure relative to the ambient pressure when the shaft holding sleeve 11 is inserted therein, thereby hindering the shaft holding sleeve 11 from being smoothly inserted and removed.
- the inside of the fitting hole 20 is communicated with the outside by the groove 36, the inside of the fitting hole 20 is kept at the ambient pressure or a difference in pressure from the ambient pressure is reduced. Accordingly, the shaft holding sleeve 11 can be smoothly inserted and removed, so that the replacement of the shaft holding sleeve 11 can be facilitated, thereby contributing to an overall improvement in the shaft diameter enlarging work.
- the air communication passage of the shaft holding sleeve 11 is not limited to the groove 36 in so far as the air communication passage extends from the front end surface of the shaft holding sleeve 11 inserted in the fitting hole 20 to a surface of the exposed portion 33.
- the air communication passage may be configured as a through hole 37 extending from the front end surface of the shaft holding sleeve 11 to the opposite end surface thereof.
- an attaching portion 39 to which a lifting lug 38 is detachably fastened, may be provided on the outer peripheral surface of the shaft holding sleeve 11.
- the shaft holding sleeve 11 has a weight of about 60kg for a large article and thus is relatively heavy although being varied depending on the shaft stock to be held, the shaft holding sleeve 11 can be suspended via the lifting lug 38 so that the burden of workers in an operation of exchanging the shaft holding sleeve 11 can be reduced.
- workability in exchanging of the shaft holding sleeve 11 can be further improved.
- the flange pipe 35 for fixing the shaft holding sleeve 11 to the spindle 14 is constructed as a separate body from the cylindrical portion 30 of the shaft holding sleeve 11.
- the cylindrical portion 30 may be integrally provided with a flange portion 40.
- the flange portion 40 may be provided with a handle 41 as a grip portion.
- the shaft holding sleeve 11 has a cylindrical outer sleeve 3 OA, an inner sleeve 30B inserted in the outer sleeve 30A and a backing metal 31 fitted in the inner sleeve 30B.
- the outer sleeve 30A is inserted in the fitting hole 20 of the spindle 14, and the outer sleeve 30A and the inner sleeve 30B inserted in the outer sleeve 30A are supported at rear end surfaces thereof by the pressure receiving plate 22.
- the shoulder 34 provided on an outer peripheral surface of the outer sleeve 30A is pressed by the flange pipe 35 fastened to the opening end of the spindle 14 in which the fitting hole 20 is opened, and as a result, the outer sleeve 30A is fixed to the spindle 14.
- the inner sleeve 30B receives the end portion of the shaft stock W.
- the backing metal 31 forming a bottom of the shaft holding sleeve 11 is supported by the knock pin 24 and bears an end surface of the shaft stock W.
- the backing metal 31 is configured to be pressed by the knock pin 24, so that the end portion of the shaft stock W inserted in the shaft holding sleeve 11 is pushed out of the shaft holding sleeve 11.
- the inner sleeve 30B receives a reaction force of an alternating load exerted on the shaft stock, and in particular, a relatively large load is applied to a surface 30a of an opening portion of the inner sleeve 30B. Accordingly, the inner sleeve 30B is worn due to repeated uses.
- the inner sleeve 30B inserted in the outer sleeve 3 OA can be removed from the outer sleeve 30A , so that only the inner sleeve 30B can be exchanged depending on a wear degree.
- the inner sleeve 30B contacts the radially enlarged portion of the shaft stock during the shaft diameter enlarging process, and thus as the shaft stock W is compressed, a load is exerted on the inner sleeve 3 OB in a direction opposite to a compression direction of the shaft stock W.
- the outer sleeve 30 A and the inner sleeve 3 OB are provided with an engaging structure for preventing a movement thereof in the direction opposite to the compression direction of the shaft stock W.
- Fig. 13 shows one example of the engaging structure provided in the outer sleeve 30A and the inner sleeve 3 OB.
- An annular concave-convex portion 70 is provided on an inner peripheral surface of the outer sleeve 30A and an annular concave-convex portion 71 to be engaged with the concave-convex portion 70 of the outer sleeve 30 A is provided on an outer peripheral surface of the inner sleeve 30B.
- the concave-convex portions 70, 71 of the outer sleeve 3 OA and the inner sleeve 30B are engages with each other, thereby preventing the inner sleeve 30B from being displaced in the direction opposite to the compression direction of the shaft stock due to the load.
- a depth D of the concave portion and a height H of the convex portion in each of the concave-convex portions 70, 71 is preferably equal to or greater than 50 ⁇ and equal to or smaller than 1% of an outer diameter of the inner sleeve 30B.
- the inner sleeve 30B is inserted into the outer sleeve 3 OA, for example, by shrinkage fitting. While each of the concave-convex portions 70, 71 of the outer sleeve 30A and the inner sleeve 30B has a plurality of concave portions and convex portions, according to an alternative example, only one pair of concave portion and convex portion may be provided.
- FIG. 14 shows another example of the engaging structure provided in the outer sleeve 3 OA and the inner sleeve 30B.
- each concave portion and convex portion of the concave-convex portions 70, 71 of the outer sleeve 30 A and the inner sleeve 30B is configured in a saw-tooth shape extending away from a center axis (the reference line A) of the outer sleeve 30A and the inner sleeve 30B in the direction opposite to the compression direction in which the shaft stock is compressed.
- the inner peripheral surface of the outer sleeve 30 A and the outer peripheral surface of the inner sleeve 3 OB are formed in a tapered shape extending away from the center axis (the reference line A) of the outer sleeve 3 OA and the inner sleeve 3 OB in the direction opposite to the compression direction.
- the inner sleeve 30B can be inserted into the outer sleeve 30A by press fitting, thereby facilitating insertion of the inner sleeve 30B into the outer sleeve 3 OA.
- a hard material is preferably used as a material for the shaft holding sleeve 11 (or the inner sleeve 30B of the shaft holding sleeve 11).
- a frequency of exchanging the shaft holding sleeve 11 (or the inner sleeve 30B of the shaft holding sleeve 11) can be lowered, thereby improving the shaft diameter enlarging work.
- a material having a Rockwell hardness (JIS G 0202) of HRC58 or more can be preferably used, and the material can include die steels, such as SKD11, high speed steels, such as SKH51, semi-high speed steels or like.
- a surface hardening treatment may be applied on the shaft holding sleeve 11 (or the inner sleeve 30B of the shaft holding sleeve 11).
- the Vickers hardness (JIS Z 2244) of the hardened surface is preferably equal to or greater than HV1200, more preferably equal to or greater than HV3000. It is also preferable that the hardened surface be smooth.
- Examples of surface hardening treatment include coating, such as vanadium-based coating, chromium-based coating, titanium-based coating or diamond-like carbon (DLC) coating, nitriding and the like.
- the surface hardening treatment is performed at least on a surface 30a of the opening portion of the shaft holding sleeve 11, and also may be performed on the entire inner peripheral surface of the cylindrical portion 30 including the surface 30a of the opening portion (or the entire inner peripheral surface of the inner sleeve 30B of the shaft holding sleeve 11) or may performed on the entire surface of the shaft holding sleeve 11 (or the entire surface of the inner sleeve 30B of the shaft holding sleeve 11).
- the coating may be composed of a single layer coating formed by various coatings listed above or a multilayer coating formed by one or more thereof.
- Examples of method of forming the coating can include salt bath immersion method (thermo-reactive deposition and diffusion method), chemical vapor deposition (CVD), physical vapor deposition (PVD), plasma CVD (PCVD) and the like.
- a jig may be used when exchanging the shaft holding sleeve 11.
- Fig. 15 shows a configuration of one example of a jig for the shaft diameter enlarging apparatus.
- the jig 50 shown in Fig. 15 has a plurality of cylindrical guide rods 51 (only one is shown in the figure). Screw holes are provided in the opening end of the spindle 14 to which the flange pipe 35 of the shaft holding sleeve 11 is fastened.
- the guide rod 51 shown in Fig. 15 is fastened to one of the screw holes located vertically below the fitting hole 20 so that it is attached to an opening edge portion of the fitting hole 20.
- the shaft holding sleeve 11 is seated on the plurality of guide rods 51 and thus mounted on the guide rods 51.
- An outer peripheral surface of each guide rod 51 is flush with the inner peripheral surface of the fitting hole 20 along a generatrix line of the outer peripheral surface thereof that contacts the mounted shaft holding sleeve 11 , so that the shaft holding sleeve 11 is smoothly moved from on the guide rods 51 into the fitting hole 20 and also from the fitting hole 20 onto the guide rods 51. Therefore, operations of inserting and removing the shaft holding sleeve 11 can be easily performed, and thus workability in exchanging of the shaft holding sleeve 11 can be further improved.
- each of the guide rods 51 is provide at a distal end thereof with a large diameter stopper portion 52, and the stopper portion 52 is abutted to the shaft holding sleeve 11 to prevent the shaft holding sleeve 11 from being dropped out, in a case where the shaft holding sleeve 11 is excessively moved toward the distal ends of the guide rods 51, such as when the shaft holding sleeve 11 is removed from the fitting hole 20.
- FIGs. 16 and 17 show a configuration of another example of the jig for the shaft diameter enlarging apparatus.
- the jig 60 shown in Figs. 16 and 17 is formed in an annular shape and is fitted on the outer side of the opening end of the spindle 14 to be mounted to the spindle 14.
- the jig 60 has a half-cylindrical support portion 62 formed to protrude from a lower edge, in the vertical direction, of an opening 61 exposing the fitting hole 20, and the shaft holding sleeve 11 is mounted to the support portion 62.
- An inner peripheral surface of the support portion 62 is flush with the inner peripheral surface of the fitting hole 20, so that the shaft holding sleeve 11 is smoothly moved from on the support portion 62 into the fitting hole 20 and also from the fitting hole 20 onto the support portion 62.
- the jig 60 of the present example the jig 60 can be easily mounted to and removed from the spindle 14 and workability in exchanging of the shaft holding sleeve 11 can be further improved.
- Example 1 semi-high speed steel was used as the base material, and surface hardening treatment was omitted.
- Example 2 semi-high speed steel was used as the base material and nitriding was performed as surface hardening treatment.
- Example 3 SKH51 (high speed steel) was used as the base material, and as surface hardening treatment, a VC (vanadium carbide) coating was formed by TD Process (trademark), a type of salt bath immersion method.
- Base material hardnesses and surface properties of the sleeves of Examples 1 to 3 are shown in Table 1.
- Galling life 0 1 1 396 With respect to each of the sleeves of Examples 1 to 3, shaft diameter enlarging process was repeatedly performed under the same conditions by the shaft diameter enlarging apparatus 10 described above, and then the number of shaft stocks processed until a visible galling (adhesion wear) occurred was evaluated as a life.
- the evaluation results are shown in Table 1. From the evaluation results shown in Table 1 , it can be found that wearing of the sleeves due to contact with shaft stocks can be suppressed by performing the surface hardening treatment. In addition, by suppressing wearing of the shaft holding sleeve 11 , a frequency of exchanging the sleeves can be lowered, thereby improving the shaft diameter enlarging work.
- a shaft holding sleeve 11 is inserted in a fitting hole 20 of a compressing machine 12a, 12b, 17 that applies an axial compression stress to a shaft stock W to hold an end portion of the shaft stock W during a shaft diameter enlarging process for radially enlarging a portion of the shaft stock W.
- the shaft holding sleeve 11 includes a front end surface to be inserted in the fitting hole 20, an exposed portion 33 to be exposed to an outside of the fitting hole 20, and at least one air communication passage 36, 37 extending from the front end surface to a surface of the exposed portion 33.
- the air communication passage 36, 37 may include a groove 36 formed on an outer peripheral surface of the shaft holding sleeve 11.
- the air communication passage 36, 37 may include a through hole 37 extending from the front end surface to an opposite end surface of the shaft holding sleeve 11.
- the shaft holding sleeve 11 may further include an attaching portion 39 provided on an outer peripheral surface of the shaft holding sleeve 11 , the attaching portion 39 being configured such that a lifting lug 38 is attachable and detachable with respect to the attaching portion 39.
- the shaft holding sleeve 11 may further include a grip portion 41 provided on the exposed portion 33.
- the shaft holding sleeve 11 may further include a surface-hardened portion 30a at least at an opening portion of the shaft holding sleeve 11 from which the end portion of the shaft stock W is inserted into the shaft holding sleeve 11.
- a shaft diameter enlarging apparatus 10 includes a pair of shaft holding sleeves 11 described above to hold respective end portions of a shaft stock, a compressing machine 12a, 12b, 17 having fitting holes 20 into which the pair of shaft holding sleeves 11 are inserted respectively, the compressing machine 12a, 12b, 17 being configured to compress the shaft stock W having the respective end portions held by the pair of shaft holding sleeves 11 in an axial direction of the shaft stock W, and a load generation device 18, 19 configured to apply, to an intermediate portion of the shaft stock W having the respective end portions held by the pair of shaft holding sleeves 11 , an alternating load in a direction intersecting the axial direction.
- a jig 50, 60 for use with the shaft diameter enlarging apparatus 10 described above is provided.
- the jig 50, 60 includes a mounting surface on which the shaft holding sleeve 11 is mounted when inserting the shaft holding sleeve 11 into the fitting hole 20. In a state in which the jig 50, 60 is attached to an opening edge portion of the fitting hole 20, the mounting surface is flush with an inner peripheral surface of the fitting hole 20.
- a shaft holding sleeve 11 is configured to hold an end portion W of a shaft stock during a shaft diameter enlarging process for radially enlarging a portion of the shaft stock W.
- the shaft holding sleeve 11 includes a cylindrical outer sleeve 30A adapted to be fixed to a compressing machine 12a, 12b, 17 that applies an axial compression stress to the shaft stock W, and an inner sleeve 30B provided inside the outer sleeve.
- the inner sleeve 30B is configured to accommodate the end portion of the shaft stock W and is arranged to contact the radially enlarged portion of the shaft stock W.
- the outer sleeve and the inner sleeve are provide with an engaging structure 70, 71 configured to prevent a relative movement of the inner sleeve 30B with respect to the outer sleeve 30 A in a direction opposite to a compression direction in which the shaft stock W is compressed.
- the engaging structure 70, 71 may be provided on an inner peripheral surface of the outer sleeve 3 OA and on an outer peripheral surface of the inner sleeve 30B.
- the engaging structure 70, 71 may include an annular concave-convex portion.
- Each concave portion and convex portion of the engaging structure 70, 71 may be configured in a saw-tooth shape extending away from a center axis A of the outer sleeve 3 OA and the inner sleeve 30B in the direction opposite to the compression direction.
- the inner peripheral surface of the outer sleeve and the outer peripheral surface of the inner sleeve may be formed in a tapered shape extending away from the center axis A of the outer sleeve 30A and the inner sleeve 3 OB in the direction opposite to the compression direction.
- a depth of each concave portion and a height of each convex portion of the engaging structure 70, 71 may be equal to or greater than 50 ⁇ and equal to or smaller than 1% of an outer diameter of the inner sleeve 30B.
- the shaft holding sleeve 11 may further include a surface-hardened portion 30a at least at an opening portion of the inner sleeve 30B from which the end portion of the shaft stock W is inserted into the shaft holding sleeve 11.
- a Vickers hardness of the surface-hardened portion 30a may be equal to or greater than HV 1200.
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2014056520A JP6360697B2 (en) | 2014-03-19 | 2014-03-19 | Shaft holding member for shaft enlargement processing |
JP2014056519A JP6427326B2 (en) | 2014-03-19 | 2014-03-19 | Shaft holding sleeve, shaft enlargement processing machine, and jig for shaft enlargement processing machine |
PCT/JP2015/058650 WO2015141865A1 (en) | 2014-03-19 | 2015-03-17 | Shaft holding sleeve, shaft diameter enlarging apparatus and jig for shaft diameter enlarging apparatus |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3119542A1 true EP3119542A1 (en) | 2017-01-25 |
EP3119542B1 EP3119542B1 (en) | 2020-04-29 |
Family
ID=52814167
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP15714685.3A Active EP3119542B1 (en) | 2014-03-19 | 2015-03-17 | Shaft holding sleeve, shaft diameter enlarging apparatus and jig for shaft diameter enlarging apparatus |
Country Status (4)
Country | Link |
---|---|
US (1) | US20160346828A1 (en) |
EP (1) | EP3119542B1 (en) |
CN (1) | CN106102954A (en) |
WO (1) | WO2015141865A1 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP3037189B1 (en) * | 2014-12-23 | 2018-11-07 | Ellwood National Investment Corp. | Net shaped forging for fluid end blocks |
JP6560880B2 (en) * | 2015-03-25 | 2019-08-14 | 高周波熱錬株式会社 | Mold for enlargement processing and enlargement processing method |
Family Cites Families (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3111327A (en) * | 1961-07-06 | 1963-11-19 | Ruehl Harold | Expansible and contractible work piece holder |
CH480119A (en) * | 1967-04-27 | 1969-10-31 | Emuge Werk Richard Glimpel | Clamping device with a clamping sleeve that can be changed in circumference |
RU2159162C2 (en) * | 1998-10-01 | 2000-11-20 | Институт проблем сверхпластичности металлов РАН | Method for working blanks of metals and alloys |
EP1120178A1 (en) * | 1999-01-20 | 2001-08-01 | Iura Co., Ltd | Method and device for increasing diameter of metal shaft material |
JP3424000B2 (en) * | 1999-06-02 | 2003-07-07 | 株式会社いうら | Color molding equipment |
JP2000237832A (en) * | 1999-02-17 | 2000-09-05 | Iura:Kk | Method and device for expanding metal tube |
EP1675697B1 (en) * | 2003-10-21 | 2011-03-09 | Showa Denko K.K. | Forging method, forged article and forging apparatus |
DE50304879D1 (en) * | 2003-11-06 | 2006-10-12 | Schunk Gmbh & Co Kg | Intermediate bushing for a chuck and method for its production |
JP4610202B2 (en) * | 2004-01-30 | 2011-01-12 | 株式会社いうら | Heat-treatable shaft enlargement processing equipment |
JP4927590B2 (en) * | 2007-02-19 | 2012-05-09 | 株式会社いうら | Axial hypertrophy processing machine |
DE102008060374A1 (en) * | 2008-08-29 | 2010-03-04 | Franz Haimer Maschinenbau Kg | damping sleeve |
CN201486982U (en) * | 2009-08-25 | 2010-05-26 | 哈尔滨飞机工业集团有限责任公司 | Lining arranged in blind hole |
CN202097337U (en) * | 2011-01-17 | 2012-01-04 | 东莞诚兴五金制品有限公司 | Hexagon-headed bolt die |
JP5977530B2 (en) * | 2012-02-15 | 2016-08-24 | 高周波熱錬株式会社 | Shaft holding unit used for shaft enlargement processing, shaft enlargement processing device, and shaft enlargement processing method using the same |
CN202825251U (en) * | 2012-06-07 | 2013-03-27 | 安徽德锐仕机床制造有限公司 | Locating pin with air discharge duct |
-
2015
- 2015-03-17 WO PCT/JP2015/058650 patent/WO2015141865A1/en active Application Filing
- 2015-03-17 US US15/117,293 patent/US20160346828A1/en not_active Abandoned
- 2015-03-17 CN CN201580014839.3A patent/CN106102954A/en active Pending
- 2015-03-17 EP EP15714685.3A patent/EP3119542B1/en active Active
Also Published As
Publication number | Publication date |
---|---|
CN106102954A (en) | 2016-11-09 |
US20160346828A1 (en) | 2016-12-01 |
EP3119542B1 (en) | 2020-04-29 |
WO2015141865A1 (en) | 2015-09-24 |
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