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Publication numberUS2411399 A
Publication typeGrant
Publication dateNov 19, 1946
Filing dateJan 20, 1945
Priority dateJan 20, 1945
Publication numberUS 2411399 A, US 2411399A, US-A-2411399, US2411399 A, US2411399A
InventorsAlfred R Walpole
Original AssigneeAmerican Brake Shoe Co
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Apparatus for finishing forgings
US 2411399 A
Abstract  available in
Images(4)
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Claims  available in
Description  (OCR text may contain errors)

Nov. 19, 1946. A. R. WALPOLE APPARATUS FOR FINISHING FORGIN GS 4 Sheets-Sheet 2 Filed Jan. 20, 1945 F/GZ I N VEN TOR. 41/6250 2 144441 015 BI MM CM.

Nov. 19, 1946.

A. R. WALPOLE APPARATUS FOR FINISHING FORGINGS 4 Sheets-Sheet 3 Filed Jan. 20, 1945 4 7 7 OP/VE K5 415950 2 W44 ou:

Patented Nov. 19, 1946 2,411,399 APPARATUS FOR FINISHING FORGINGS Alfred B. Walpole, Chicago, Ill., assignor to American Brake Shoe Company, New York, N. Y., a corporation of Delaware Application January 20, 1945, Serial No. 573,776

.6 Claims.

1 V This invention relates to forging of metal parts and it relates particularly to the punching and/ or trimming of such forging after the usual forging operations have been performed.

In the production of metal forgings, it is of ,course necessary that the provision be made in the forging dies for sufficient draft to allow ready separation of the dies from the forging as the forging operation progresses or is completed.

.,Ordinarily, the draft or sloping surfaces thus formed by the dies on the forgings is unobjectionable as to many sides or surfaces of the forging, but in respect to those sides or surfaces that are to serve in a functional sense for purposes of mounting, bearing, power transmission or the like, such draft on the forging must be removed, and to enable this to be done in a simple and expeditious manner is an important object of this invention.

In accordance with usual practice it is customary to trim the flash from the edges of a forging, and it is customary to punch out slugs that divide the aligned recesses where a bore is to be thereafter formed in a forging, but these operations are customarily so performed that the draft on the forging is allowed to remain in place. Trimming of such flash, and the punching of such slugs from a forging in accordance with prior practice has required relatively careful handling of the forging so as to be sure that the form of the work piece that has been attained in the forging operation will not be destroyed or distorted in the course of the trimming and the punching operation, and it is a further object of the present invention to simplify and expedite the trimming and punching of forgings that the desired form of the forging will invariably be maintained. A further. and related object of the invention is to enable the critical surfaces of a forging to be held and supported in the desired form while the forging is trimmed and punched, and to enable such trimming and punching operations to be so performed that the flash and the slug as well as the draft will be removed.

More specifically, it is an object to so perform the trimming operations on a forging that the draft on the critical surfaces thereof will be removed and such critical surfaces will be so formed as to materially simplify further metal working or machining operations that are to be performed on the forgings.

Other and further objects of the present invention will be apparent from the following description and claims and are illustrated in the accom panying drawings which, by way of illustration,

show a preferred embodiment and the principle thereof and what I now consider to be the best mode in which I have-contemplated applying that principle. Other embodiments of the invention embodying the same or equivalent principle may be used and structural changes may be made as desired by those skilled in the art without departing from the present invention and the purview of the appended claims.

In the drawings:

1 Fig. 1 is a side elevational view of a punching and trimming apparatus constructed in accordance with the present invention, such View being taken substantially along the line l--l of Fig. 2;

Fig. 2 is a vertical sectional View, taken substantially along the line 2-2 of Fig. 1, and showing the elements of the punching and trimming apparatus in their separated or rest positions, and with a work piece in position on the lower die element of theapparatus;

Fig. 3 is a view similar to Fig. 2 and showing the elements of the punching and trimming apparatus after the forging or work piece has been clamped in position and prior to the start of the punching and trimming operations; and

Fig. 4 is a view similar to Figs. 2 and 3 and illustrating the elements of the punching and trimming apparatus after completion of the punching and trimming operation and before the elements of the apparatus have started their relative separating movement.

In the form chosen for disclosure herein, the invention is embodied in a cutting and trimming apparatus In that is shown in elevation in Fig. 1 of the drawings. this cutting and trimming apparatusbeing adapted for mounting in conventional press equipment, and as herein shown the cutting and trimming apparatus I0 is illustrated as mounted in a conventional punch press ll having spaced vertical columns [2 with a bed 13 between the columns 12 near their lower ends and having a ram or head 14 disposed upwardly from the bed l3 and mounted for vertical reciprocation between the columns l2.

The punching and trimming apparatus of the present invention includes a stationarily mounted lower portion i5 and a movable upper portion 16 that is in the present case carried on the ram ll of the press. The lower or stationary portion 15 of the apparatus includes a lower die shoe 20 secured in a conventional manner upon the bolster plate 2! of the press, such bolster plate 2| being disposed upon the bed l3. The die shoe 20 is in the form of a relatively thick flat plate and serves as a mounting for a lower die 22 upon which the work piece such as a forging W is rested and supported during the punching and trimming operation. As will be evident in Fig. 2 of the drawings, the lower die 22 has a projection 23 on its lower face that fits into a complemental reces in the die shoe 29, and the die 22 is held in place-by cap. screws 24 .extended .npwardly through fthe' die shoe and .;threaded izinto. the lower die 22. In the present instance the apparatus It is fitted particularly for the punching and trimming of a wheel-like work piece W having a hub 25, an annular webs26 :and an outer rim 27, as indicated in Fig. 2" ofthe drawings. In the final form of the work piece W thafltxis herein shown, there is to be a centralboreiformed therein, as shown in Fig. 4 of the drawings, and in order that this bore may readily be formed in the work piece W, the forging operation is arranged to aiford aligned recesses 28 that are disposed on the axis of the hub and that are .divided'or separated by a web or slug 29. It will be evident in Fig. 20f the drawings that each of the recesses 28 has walls tapered as at 36 so as to afford the draft required forthe forging tools or dies in the course of the forging operation. similarly the outer surfaces of the hub 25are of a sloping form as indicated'at 3| in-Fig. 2, while corresponding draft is provided "at 32 on the inner face of the rim 21. The outerf'aces'ofthe'rim 21 also have a sloping surface '3'3.that afford the necessary draft, and "these surfaces 33 ordinarily merge into the flash that is formed along the :parting line .of the'fo'rging dies used in forging operation.

It will begrecognize'd thatlin different kinds and withdifferent forms of work piece W, there will be considerable variation in the surfaces that are considered to be critical and which are torbeused in mounting or in the'transmission of power by the work piece .or for other functionalj'purposes, butinthe present instance, the outer periphery of the rim 2! of the work piece may be intended .for further machining operations for the purpose of forming gear teeth thereon, or.rnay be'inten'ded to .serve as ,a rolling surface in the event that the .work piece is to be utilized a-s.a roller. Further- .more, the central bore of the Work piece 'W herein .shown is considered to bea critical Surface that will in .most instances be subjected to further machining operations, .and in accordance with i the presentinvention the punching and trimming apparatus is. constructed and arranged to trim the flash '34 and thedraft 33 from the. outer periphery of the .rim 2.! .and to punch. the draft '38 and the slug '29 .from the hub .25 thereby to provide a cylindrical. outer surface on therim 2'! anda con- -centriccylindricalicentral bore in the hub 25.

In order that such punching and trimming operations may be performed while maintaining the desired form of the element-s of the forging W, theilowendie22 and an upper die 40 are arranged to embrace the work piece W so as to maintain the form of the workpiece Wwhile the punching and trimming operations are performed. To this end, the upper face of the .lower die 22 is formed so as to.a.ccurately engage the lowerend surface of the hubf25, the draft surface 3|, lower half .of the hub 25, .thelower faceof the web 26, the draft surface .32 of the rim 2'! and thelower side face .of;the-rim 127. In practice, the work piece Wis .placedina position of thelower die 22, as shown .inFigj2, while theram l4 and the upper die are in .the uppenor. retracted position of Figs. 1 and .2, .and this is done immediately after the completion of the forging operation so that the a bearing sleeve 56 fixed within work piece W is still at substantially the same temperature as it was when the forging operation was completed. After the forging W has been placed in position on the lower die 22, the upper die 40 is brought down into engagement with the upper surface of the work piece W, as

.showninFi 3, after which the punching and trimming aoperationsiare performed while the work piece W is firmly held "between'the lower and upper dies 22 and 40.

In order that the upper die 4!! may be moved into itsactive position of Fig. 3 and may yet be carried .upon the upper head 14 of the press, the

.mounting of -.the 'upper die 40 is related to the ported on the punch holder M that is "fixed by means including dovetail member upon "the lower face of the head of ram M of the press. The mounting of the trimming ring 43 and-the punch 42 is, in accordance w'iththe present invention, such as to cooperate in affordingsupporting and guiding means for the upper die lll. Thus the trimming "ring '43 is secured upon the lower end of a supporting member 46,- this supporting member in the present case "being'generally cylindrical'in both its inner'and outer-form and having two opposite sides flattenedforclearance purposes as willhereina fter appear. The supporting member '45 has its upper endrecessed into the punch support 44 at 44A, andissecured in position by cap screws 45A. The trimming ring 13 is in the present instance secured in a position in a locating groove in the lower faceof the supporting member 46 by cap screws 48 as shown in Fig. 2 of the-drawings. "The'punch-M is,in the present case, sectional in characterso as to enable the lower en'd'por-tion thereof to be readily replaced, and where this arrangement is employed, the upper or mounting portion of the punch has a head that is disposedagainst the lower face of the punchholder Mandsecured in this position by cap screws 50.

The punch 42 serves as guidingmeanslfor locating the upper die4'0 in proper position'for engagement with the upper-surfaces of the forging W, and in attaining such guiding action, the

upper die 40 is mounted on an upper dieholder SE-that is disposed within the mounting member 45. The upper die holder '55 "hasa longitudinal opening therein that surrounds the punch "42, and

this central opening is arranged to'have bearing engagement with the upper enlarged portion 42A of the punch 42. When the head or.ram M of the press is in its upper position of Fig. 2, 'the upper die holder is located in its most lower position with respect to the punch 42 and the mounting member 46, this position being determined by :a downwardly facing annular shoulder 5'! formed on the dieholder 55 and engaged at this time with an inwardly projected annular flange or shoulder 58 formed on the mounting member'46.

The upper die holder -55 is 'urged downwardly toward-this position by an expansive coil'spring v relatively deep annular groove '62 'extendeii into the upper face of'the die holder55. In the'pres ent case, the upper die 40 is held in position on the lower end of the die holder 55 by cap screws 63 that are extended downwardly from the bottom of the annular groove 52 and are threaded into the die 40. The die 40 is positioned in a lateral sense by a projection 54 that is seated in a complemental recess in the lower face of the upper die holder 55.

When the ram i4 is in its upper position, the

die holder 55 is in the relative position determined by the shoulder 58, and the lower end portion of the punch 42 is disposed in a central bore 40A formed in the die 49, while the trimming ring 43 is disposed considerably above the lower or effective surfaces of the die 40, as willbe evident in Fig. 2 of the drawings. It will also be observed that the lower surfaces of the upper die 40 are formed so as to be complemental with the upper end surfaces of the hub 25 of the work piece, the draft surface 3| of the hub, the upper surface of the web 26, and the upper side surface of the rim 21, and when a punching and trimming operation is to be performed these complemental surfaces of the upper die 40 are brought into engagement with the upper surfaces of the forging W before the punching and trimming operations are performed, thereby to maintain the forging in the proper form while the punching and trimming operations are performed. Thus, as will be evident by comparison of Figs. 2 and 3 of the drawings, the downward movement of the ram l4 first acts to cause such en gagement of the upper die 4|] with the forging W. In order that the die 40 may accurately match in every instance with the forging W located on the lower die 22, the downward move- ,ment of the upper portion of the apparatus is accurately guided with respect to the lower portion l5 of the apparatus. Such guiding action is in the present instance accomplished through the provision of a plurality of guide or leader pins 65 as shown in Fig. 1 of the drawings, such leader pins being extended upwardly from each of the four corners of the die shoe 20 in a perpendicular and rigid relation thereto. Each leader pin 55 is extended into a guiding bushing 66 that is bolted at B1 to the corresponding corner of the lower face of the punch holder 44, and with this construction the downward movement of the ram 14 and the punch holder 44 causes the guide bushings to ride downwardly in accurately guided relationship along the leader pins 65. In the course of such downward movement, the upper die 40 is engaged with the upper surface of the forging W, and as the downward movement of the ram I4 further progresses, the spring 60 is compressed so as to apply substantial clamping and positioning forces to the die 46. In the course of such further downward movement, the punch 42 and the trimming ring 43 move downwardly and into the operative relationship to the forging W, the arrangement in the present instance being such that the punch 42 first enters upon its punching operation prior to the engagement of the trimming ring 43 with the forging. With this arrangement the punching and trimming operations are completed at substantially the same time.

The punch 42 acts, as will be evident from a comparison of Figs. 3 and 4, to punch the draft 30 as well as the slug 29 from the hub 25 0f the forging, and the slug and the associated material are discharged downwardly through a dis posal opening H! formed in the lower die 22 and 'in the die shoe 20 and the bolster plate and bed of the press. The trimming ring 43 serves to trim the draft- 33 as well as the flash 34 from the periphery of the rim 2'! of the forging, and this material is in the form of a ring that may cling to the outer surfaces of the lower die 22. For this reason, an annular stripper ring H is dispose-d in surrounding relation to the lower die 22, this stripper ring being guided for vertical movement on guide studs 12 that extend through a flange I IA of the stripper ring and are threaded into the die shoe 20. An expansive coil spring 13 surrounds each of the guide-studs 12 so as to urge the stripper ring 1| in an upward direction when the trimmer ring 43 is withdrawn. The springs 13 are, of course, compressed by any material that may be disposed between the trimmer ring 43 and the stripper plate H, andit may be here observed that the flash and other material cut from the work piece W have not been shown in Fig. 4 of the drawings, although such material would, in fact, be present at the stage of operation that is illustrated in Fig. 4. Upon completion of the punching and trimming operation, the ram I4 is withdrawn in an upward direction, and as such withdrawal movement progresses from the relationship shown in Fig. 4 to the relationship shown in Fig. 3, the spring 60 gradually expands so as to maintain an upper die in engagement with the forging W. When the ram has reached the position shown in Fig. 3, the flange 58 engages the shoulder 51 upon the upper die holder 55, thereby to move the die holder 55 with the supporting member 45 in the continued upward or withdrawing movement of the ram, and at the completion of the upward stroke of the ram, the parts attain the position shown in Fig. 2 of the drawings.

Under some circumstances the trimming ring 43 may not strip properly along or with respect to thesides 0f the forgin W, or the punch 42 may not strip properly in an upward direction from the central bore of the forging W, and in such a situation, the forces acting between the trimming ring 43 and the forging, or between the punch 42 and the forging, may be of such a magnitude that the spring 60 will be unable to maintain the die 40 in its lower position while the ram I4 is being withdrawn to the position of Fig. 3. When this occurs it is desirable to have a positive stripping force applied so as to strip the completed forging W from the punch 42 and from the trimming ring 43. In accordance with the present invention, therefore, a lost motion connecting means is provided between the upper die holder 55 and the lower die shoe 20 in such a way that positive stripping forces are applied in the event that the spring 55 does not attain the desired stripping action. As herein shown, this lost motion connection includes a pair of pins 15 extended in opposite directions outwardly from the upper die holder 55 and through slots N5 formed in the mounting member 46 so as to open through the opposite outer flat surfaces. Each of these pins 15 has a link 1'! pivotally supported thereon to depend therefrom along the adjacent outer flat surfaces of the mounting member 46, and the lower ends of these links are arranged to ride in a slidable relation within upstanding sleeves 18 that are secured rigidly on the die shoe 2!]. The sleeves 18 have slots 19 formed in their opposite sides, such slots terminating short of the upper ends of the sleeves l3, and each link T! has a transverse pin in its lower end that extends in opposite directions outwardly through the slots 19 of the related sleeve 18. The relationship of the slots Hand the-pinstil is such that when the upper-Edie holder-155 has reached the height at which it is located in Fig. 2, the pins 80 will engage the upper ends of the slots 79. Thus, it will be clear that if the forging W does not strip from the trimming .ring-43-and thereby causes the upper die holder 55 to remain in the position shown in Fig. 4 with respect tothe mounting member 46, then as the .upward or withdrawing stroke of r the ram M progresses, thedie holder 55 will reach the upper position of Fig. 2 prior to the time when the punch 42 and trimming ring 43 have reached end upper portions, andunder such circumstances the links 11 will -restrain the die holder '55 against further upwardmovement and hence, further upward withdrawal of the "ram It will forcibly withdraw the trimming ring 43 and the punch 42 upwardly so -as to effect the stripping .of the forging from the cutting tools.

sInthe use of the punching and trimming apparatus of this invention, it will be observed that the surfaces of the forging are firmly supported at all times exceptwhere the punching or trimming operations are to be performed, and as will be evident in Fig. 4 of the drawings, the upper surfaces of the lower die 22 where such surfaces border theopening Iii are arranged to support the lower surface of the hub .25 relatively close to the border of a central bore that is to be punched by the punch 42, and hence, the action of the lower die 22 at this point prevents distortion of the lower surface of the .hubl25. 'Ihecorresponding .upper surfaceo-f thehub 25 is of course held in the proper formby the portions of the upper die 40 that surroundand define the central opening 40A of the upper die, while the other surface of the upper and lower die engage the surfaces of the work piece so as to prevent distortion of the portions of the forgin in the course of the punching and trimming operations. With respect to the outer edge portions of the rim 21 of the forging,

it will be observed that the edge surfaces of the a rim are engaged by the upper and lower dies substantially to the outer periphery of the rim that is to be defined by the trimming operation, and thus the rim is held accurately in the desired form as the trimming operation progresses.

Since the forging W is clamped betweenvthe upper and lower die with a substantial'force afforded by the spring 60, such clamping action may be advantageously utilized to effect stamping of identification numbers and the like in the surfaces of the forging, and as indicated in desired outline, in Fig. 2 of the drawings, a stamping die 85 may be mounted in the lower die 22 so as to form an impression in a portion of the forging when the forging is forced downwardly by the action of the upper die it. Thus the usual operation of manually applying such marking or other identification to the forging may be eliminated where the-punching and trimming apparatus of the present invention is employed,

From the foregoing description it will be evident that the present invention enables forgings to be punched and trimmedin .asimple and expeditious manner, and this isaccomplished insuch a way that the form of the forging is maintained at all times. Moreover, thepunching and trimming appar'atus of the present invention,-by engaging and supporting all of the surfacesof the forging except those that are to be punched or trimmed, en ables relatively large amounts of material in such punching and trimming operations. Because of this advantageous arrangement, .it i possible to remove not only .theslug and the flash from the myself .of such changes 8 forgings but also to remove the. draft from the critical surfaces of'the forging, and lbecause of this, the further machining or other ,finishingrof' such critical surfaces of the forging ,is materially simple. The punching and trimming apparatus at the present invention is rugged in character, and the arrangementiis suchthat proper stripping action is obtained in every instance.

Thus, while I have described the .preferredembodimentof myinvention, it is to be understood that these are capable of variation and modification and I therefore do not wish to be limitedto the precise details set, forth, but desire toavail and alterations as fall within the purview of the following claims.

v..I claim:

1.,In a trimming apparatus for trimming ,a forging, a die holder and an upper holder ,plate, means guiding said .holderplate for movement along a predetermined path toward and away .from.said die holder, a lower vdie mounted on said die "holder in a fixedposition and having surfaces thereon eomplemental .to those lower surfaces of a forging that are to be maintained in proper forrnduring trimming of the forging, an .upper die havinglower surfaces complemental .to those upper surfaces of a forging that are tobemaintained in properlform lduring trimming of the forging, an upper di holder upon which said upper :die is secured, a mounting member having an enlarged central chamber .therein'in which said upper die holder is disposed, means securing the upper end of said mountingmember on said upperholder plate, cooperating shoulders on said upper die holder and on said mounting member to limit downward movement of said upper die holder relative to said mounting member, means acting yieldingly between said upper holder plate and said upper die holder to urge said upper die :holder in a downward direction, and cutting means mounted in fixed relation to said upper holder plate and extended downwardly therefrom for trimming a, predetermined surface of clamped and supported forging in the cours of downward movement of said upper holder with respect to said lower dieholder.

v2. In a combination punching and trimming apparatus for trimming the draft from the rim of a forging and for removing the slug and the draft from an opening that is to be formed in the forging,a die holder and an upper holder .plate, leader pins and bushings ,gui'ding said holder plate formovement along a predetermined path toward and away fromisaid die holder, ,a lower die mounted on said die holder in a ,fix'ed position and having surfaces thereon ,complemental to those lower surfaces of a forging that are to be maintained in proper form during punching and trimmingof the forging, .an upper die having lower surfaces complemental .to those upper sup. faces of a forging that proper form during punching andtrimming of the forging an i per dieholder upon which said upper die .is secured,,amountingmember having an enlarged central chamber therein in which said.upperldie holder is disposed, means securing the upper ,end of said mounting member on said upper holder plate, cooperating shoulders on said upper ,die holder plate, cooperating shoulderson said upper die holder and on saidmounting member to limit downward movement of said upper die, holderrelative to said mounting ,member, expansive coil spring means acting between said upper holderplate and said upper die holder to urge said upper-di holder'in a downward are to be maintained in direction, said upper die and said upper die holder having alig'nedvertical bores therein, a punch fixed on said upper holder plate and extended downwardly through said upper die holder and into the opening in said upper die, and a cutter ring secured. to a lower nd or said mounting member for removing the draft from the outer surface ofthe rim of a forging in the course of downward movement of said upper holder with respect to said lower die holder.

3. In a combination punching and trimming apparatus for trimming the draft from the rim of a forging and for removing the slug and the draft from an opening that is to be formed in theforging, a die holder and an upper holder plate,leader pins and bushings guiding said holder plate for movement along a predetermined path toward and away from said di holder, a lower die mounted on said die holder in a fixed position and having surfaces thereon complemental to those lower surfaces of a forging that are to be maintained in proper form during punching and trimming of the forging, an upper die having lower surfaces complemental to those upper surfaces of a forging that are to be maintained in proper form during punching and trimming of the forging, an upper die holder upon which said upper die is secured, a mounting member having an enlarged central chamber therein in which said upper die holder is disposed, means securing the upper end of said mounting member on said upper holder plate, cooperating shoulders on said upper die holder and on said mounting member to limit downward movement of said upper die holder relative to said mounting member, expansive coil spring means acting between said upper holder plate and said upper die holder to urge said upper die holder in a downward direction, said upper die and said upper die holder having aligned vertical bores therein, a punch fixed on said upper holder plate and extended downwardly through said upper die holder and into the opening in said upper die, a cutter ring secured to a lower end of said mounting member for removing the draft from the outer surface of the rim of a forging in the course of downward movement of said upper holder with respect to said lower die holder, and means acting between said upper die holder and said lower die holder to limit separating movement thereof to an amount that is less than the stroke of said punch.

4. In a combination punching and trimming apparatus for trimming the draft from the rim of a forging and for removing the slug and the draft from an opening that is to be formed in the forging, a die holder and an upper holder plate, leader pins and bushings guiding said holder plate for movement along a predetermined path toward and away from said die holder, a lower die mounted on said die holder in a fixed position and having surfaces thereon complemental to those lower surfaces of a forging that are to be maintained in proper form during punching and trimming of the forging, an upper die having lower surfaces complemental to those upper surfaces of a forging that are to be maintained in proper form during-punching and trimming of the forging, an upper die holder upon which said upper die is secured, a mounting member having an enlarged central chamber therein in which said upper die holder is disposed, means securing the upper end of said mounting member on said upper holder plate, cooperating shoulders on said upper die holder and on said mounting member to limit downward movement of said upper die holderrelative to said mounting member, expansive coil spring means acting between said upper holderplate and said upper die holder to urge said upper die holder in a downward direction, said upper die and said upper die holder having aligned vertical bores therein, a punch fixed on said upper holder plate and extended downwardly through said upper die holder and into the opening in said upper die, a pair of slots formed in opposite sides of said mounting member and extended parallel to said punch, a pair of pins extended outwardly from said upper die holder through said slots on opposite'sides of said upper die holder, and means affording a lost motion connection between said pins and said lower die holder to limit upward withdrawing movement of said upper die holder so as to thereby insure stripping of a forging from said punch as an incident to upward separating movement of said upper holder plate with respect to said lower die holder.

5. In a combination punching and trimming apparatus for trimming the draft from the rim of a forging and for removing the slug and the draft from an opening that is to be formed in the forging, a die holder and an upper holder plate, leader pins and bushings guiding said holder plate for movement along a predetermined path toward and away from said die holder, a lower die mounted on said die holder in a fixed position and having surfaces thereon complemental to those lower surfaces of a forging that are to be maintained in proper form during punching and trimming of the forging, an upper die having lower surfaces complemental to those upper surfaces of a forging that are to be maintained in proper form during punching and trimming of the forging, an upper die holder upon which said upper die is secured, a mounting member having an enlarged central chamber therein in which said upper die holder is disposed, means securing the upper end of said mounting member on said upper holder plate, cooperating shoulders on said upper die holder and on said mounting member to limit downward movement of said upper ber, expansive coil spring means acting between said upper holder plate and said upper die holder to urge said upper die holder in a downward direction, said upper die and said upper die holder having aligned vertical bores therein, a punch fixed on said upper holder plate and extended downwardly through said upper die holder and into the opening in said upper die, a yieldably mounted separating ring mounted on said lower die holder in surrounding relation to said lower die for stripping material from said lower die, and means affording a lost motion connection between said upper die holder and said. lower die holder to insure stripping of a forging from said punch as an incident to upward withdrawing movement of said upper holder plate.

6. In a combination punching and trimming apparatus for trimming the draft from the rim of a forging and for removing the slug and the draft from an opening that is to be formed in the forging, a die holder and an upper holder plate, leader pins and bushings guiding said holder plate for movement along a predetermined path toward and away from said die holder, a lower die mounted on said die holder in a fixed position and having surfaces thereon complemental to those lower surfaces of a forging that are to be maintained in proper form during punching and trimming of the forging, an upper die having die holder relative to said mounting memi1 c lower surfaces" c'ompleiiiental tothose uppersurfaces of: a forging that are to be maintairle'din proper form'during" punching and trimming of the forging, an upper die'holder upon which said upper die is secured, a mounting' member having an enlarged central chamber therein in which said upper die holder is disposed, means securing the upper end of said mounting member on said upper holder plate, cooperatingshou-lders on said upper die holder and on saidmounting member tolimit downw ard movement of said upper holder relative to said mounting member, expansive coil spring:.means acting between said upper holder plate and said; upper die holder to urge-said upper die holder'in a downward direction; saidupper die andsaid upper die holder havingaligned vertical bores th'erein, a punch fixed on said upper holder plate-and extended downwardly through said upper die'holder and into theopeninginsaid upper 12 die; at pair-of-"slbts'formedin' oppbs'ite 512183701 3313 mp n'ti'ng' member: and extended parallel to.said punch, a, pair or pins extended? outwardly from said upper die holder"throughwaid'slotsfonloppoe siteside'siof saiduppjer die, holder; a pairjof links one of which. is suspended fromleach ofsaidpin's; a pair of sleeves fixedon saidlowe'rdieh'oldeiiin alignment with saididepending' links and su'r rounding said links so thatsaidllinks maynmov'e vertically thereirL'each of said sleeves having at least one verticall slot Y formed therein, and each of: said links having, altra'nsverse' pin therein. exl tendedoutwardly. through the slot in. the sleeve in: whichthelinl; is positioned,saidlslots and said pins being sorelated'as to permitlfree' downward movement-of said upper die holder; butto limit upward movement ofa'said" upper die to thereby insure stripping-of a1 forging from said punchu ALFRED R; WALPOLE.

Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2499292 *Jun 17, 1947Feb 28, 1950Jones & Laughlin Steel CorpMethod of and apparatus for shearing fins from ingots
US2763325 *Jun 8, 1953Sep 18, 1956Western Electric CoStripper assembly for punch presses
US2882971 *Sep 20, 1956Apr 21, 1959George F WalesPunch construction and guide therefor
US3113379 *Feb 28, 1956Dec 10, 1963Frank Joseph JClosure fastening
US3777601 *Mar 29, 1971Dec 11, 1973P StrandellPunching apparatus
US4463637 *Oct 7, 1982Aug 7, 1984Delio Ralph DMethod and apparatus for trimming forgings
US4866976 *Aug 2, 1988Sep 19, 1989Aatec Assembling-Automations Technik GmbhApparatus for the metal working of components
Classifications
U.S. Classification83/387, 83/621
International ClassificationB23D31/04
Cooperative ClassificationB21J5/027, B23D31/04
European ClassificationB21J5/02F, B23D31/04