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Publication numberUS2145588 A
Publication typeGrant
Publication dateJan 31, 1939
Filing dateJun 8, 1937
Priority dateJun 8, 1937
Publication numberUS 2145588 A, US 2145588A, US-A-2145588, US2145588 A, US2145588A
InventorsStevenson Findlater
Original AssigneeNat Tube Co
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Pipe or tube mill
US 2145588 A
Images(4)
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Description  (OCR text may contain errors)

Jan. 31, 1939.

I s'. FINDLAL'ER 2,145,588

PIPE OR TUBE MILL Filed June 8, 1937 4 Sheets-Sheet 1 S. F'INDLATER Jan. 31, 1939.

PIPE OR TUBE MILL 4 Sheets-Sheet 2 Filed June 8, 1937 L INVENTOR. 57El/EN5ON f7/v0L 47-53 Jan. 31, 19 39. 5 F|NDLATER 2,145,588

PIPE OR TUBE MILL Filed June 8, 1937 4 Sheets-Sheet 3 INVENTOR. STEVENSON HNDLAW'EE H/5 A TTORNEYS.

Patented Jan. 31, 1939 UNITED STATES PATENT OFFICE to National Tube Company,,

New Jersey a corporation of Application June}, 1937, Serial No. 147,12'l

Claims.

This invention relates to pipe or tube mills and more particularly to the handling of the mandrel employed therein.

In order to maintain a substantial. commercial 5 yield from a pipe or tube mill, the work-piece must be completely rolled in a minimum of-time. This, of course, requires the rapid withdrawal and repositioning of the mandrel bar. That is to say, after the work-piece has been rolled and is telescoped over the mandrel bar, the latter must be completely withdrawn from within the work-piece, which is then removedfrom the outlet bed of the mill, after which the mandrel bar is returned to its original position.

On very large mills, for instance those which produce work-pieces of twenty inches in diameter, the mandrel bar and mandrel bar carriage weigh over sixteen thousand pounds and are moved into position at the rate of approximately five hundred feet per minute. -When a thin wall work-piece is being produced, the plug on the mandrel bar must be positioned very close to'the metal-workingrolls of the mill,'and if permitted to over-run its true position will occasion considerable damage to the metal-working rolls and numerous other parts of the mill.

It is among the objects of the present invention tooperate a pipe or tube mill in a manner which is not only rapid but which also eliminates damage to the component parts thereof.

Another object is to provide an inexpensive and efllcient apparatus which may be installed on pipe or tube mills of existing design to function in the manner previously mentioned.

35 The foregoing and further objects will be apparent after referring to the drawings, in which:

Figure 1 is aplan of a conventional pipe or tube mill which employs cone-shaped metal-working to s.

o Figure 2 is a plan of the mill of Figure 1 on a smaller scale and disclosing fragmentarily the outlet bed thereof.

Figure 3 is a view similar to Figure2 but dis-- a closing some of the elements of the pipe or tube mill in a different position.

Figure 4 is a view similar to Figure 1 but disclosing a mandrel bar and a mandrel plug carried thereby in the usual over-run position, which occasions the injurious results previously men- 50 tioned.

Figure 5 is a fragmentary sectional elevation of the mandrel bar carriage and its operating devices.

Figure 6 is a plan of one form of apparatus of 55 the present invention,

Figure 7 is a sectional view on the line VII-VII of Figure 6.

Flgure,8 is a wiring diagram.

. Figures 9, 10, 11, 12 and 13 are details of control switches. 5 Referring more particularly to the drawings,- the numerals 2 and 3 designate a pair of coneshaped metal-working rolls toward which there is extended a compression mandrel bar 4 carrying a mandrel plug 5 which is disposed intermediate the metal-working rolls. After a pipe or tube has been completely rolled between the metal-working rolls 2 and 3 and the intermediately disposed mandrel plug 5, and has moved onto the mandrel bar 4; it is removed from the mill by withdrawing 15 the mandrel bar and transferring the pipe or tube by the usual kick-oil arms (not shown), to a conveniently disposed skidway 6. According to conventional practice, the mandrel bar 4 is suitably attached to a mandrel bar carriage 8 which rides on an elongated frame 9 that forms part of the outlet bed of the mill.

The outlet bedis provided with a pair of substantially spaced grooved pulleys Ill and H, the latter of which is driven by a motor l2. A cable I3 is strung between the rollers I0 and It and connected at its ends to the mandrel bar carriage 8. Thus, by driving the motor i2, the man-, drel bar carriage 8, and the mandrel bar 4, are moved toward and away from the mill, for ,the

purpose previously mentioned. Referring to Figures 6 and 7 of the drawings, the metal working roll 3 is shown as provided with a shaft I4 which extends toward an adjacently disposed frame l5. This frame l5 carries a pair of aligned bearings I ,6, in which there is iournaled an internally screw-threaded sleeve or nut ll: This internally screw-threaded sleeve or nut l'l carries an externally screw-threaded shaft l8 which is connected to the shaft ll of 40 the roll 3 by means of a suitable slip-coupling 19. The shaft H has a large gear 20 secured thereto which is driven from a suitably rotated adjacently disposed shaft 22 by means of a wide pinion gear 2| which is secured to the shaft 22.v The nature of the slip-coupling I9 is such that the gears 20 and 2| are rotated to drive the metal-working roll 3 without imparting rotation to the externally screw-threaded shaft [8. A worm-gear 23 is mounted on and secured to the internally screw-threaded sleeve or nut ll. A shaft 24 is suitably journaled on the frame I5 and has secured thereto a worm 25 which engages the worm-gear 23 on the sleeve or nut ll. A reversibleelectric motor 29. is mounted on the u All frame I5 and provided with an elongated drive shaft 30 to the extended end of which there is secured a pinion 3i which meshes with a large gear 2'I, the latter being secured to the shaft 24. The motor 29 is provided with a conventional magnetic brake 34.

According to the foregoing construction, it will be seen that the driving of the elongated drive shaft 30 of the motor 29 in alternate directions will move the roll 2 toward and away from the roll 3 and the mandrel plug 5, when the latter is occupying its metal-working position.

Referring to Figure 5, a vertical support 50 is disposed over the outlet bed of the pipe or tube mill adjacent the mandrel bar carriage 9 when the latter is in its forward position. This vertical support 50 carries a shaft 5I on which there is mounted a pivotable latch 52 having a flattened portion 59 on its extended end. The upper surface of the mandrel bar carriage 8 is provided with an abutment plate 54 having a flattened face 55.

At one side of the upper end of the vertical support 50 there is disposed a fluid-actuated cylinder 59, the piston of which is pivotally connected, as at 57, to a crank-arm 58 which is secured to the shaft 5i. Thus, it will be seen that the energization of the fluid-actuated cylinder 56 will rotate the shaft 5| so as to raise the latch 50 in such manner as to present its flattened portion 53 for contact with the flattened face 55 of the abutment plate 54 on the mandrel bar carriage 8.

The vertical support 50 maybe provided with suitable adjusting mechanism (not shown) for varying the position of the mandrel bar carriage 0 with respect to the metal-working rolls 2 and 3 in order to provide for changes in the wall thickness of the pipe or tube A.

Any suitable and conventional electric wiring circuits, including control devices, are provided for the motor 29 and the magnetic brake 34.

In operation, a tube A, which is shown as having previously been pierced, is introduced between the metal-working rolls 2 and 3 for movement over. the mandrel plug 5 on the forward end of the mandrel bar 4. The tube A is moved over the mandrel plug 5 and mandrel bar 4 by the helical advancing action of the metal-working rolls 2 and 3. As soon as the trailing end of the tube A has moved over the mandrel plug 5 and onto the mandrel bar 4, the motor 29 is suitably actuated (automatically or otherwise) to withdraw the metal-working roll 3 with respect to the metal-working roll 2.

As soon as the metal-working roll 3 has been Withdrawn a predetermined distance, the motor 29 and magnetic brake 24 are deenergized, thereby applying the latter. The mandrel bar I and mandrel plug 5, simultaneously with the withdrawal of the metal-working roll 9, after the energization of the fluid-actuated cylinder 56, are moved longitudinally of the outlet bed of the tube mill and away from the rolls 2 and 3 by the energization of the motor I2 to such an extent as to withdraw the mandrel bar 4 from the interior of tube A and to permit removal of the mandrel plug 5. The tube A is removed from the outlet bed of the mill by the usual kick-off devices (not shown). The direction of rotation of the motor I 2 is then reversed to move the mandrel bar 4 and the latch 52. The magnetic brake 34 is then energized to release the shaft of the motor 29, and the latter driven in a direction of rotation which is reverse to that previously described. This reverse direction of rotation of the motor 29 is decidedly rapid and likewise rapidly moves the metal-working roll 3 toward the metal-working roll 2. As soon as the roll 3 has advanced to a position which is adjacent its metal-working position in the mill, a limit switch is operated which, in turn, very materially retards, but does not stop, the rotation of the motor 29. The motor 29 continues its rotation in this retarded fashion until the metal-working roll 3 reaches its exact true metal-working position in the mill, at which time a limit switch deenergizes the motor 29 and the magnetic brake 34, thereby applying the latter.

The metal-working rolls 2 and 3 are, at this stage of the operation, ready to receive the next pipe or tube A and advance the same helically over the mandrel bar 4 and mandrel plug 5 which are now returned to their initial metal-working positions in the manner previously described.

Referring to Figure 8 of the drawings, I have illustrated one form of electrical circuit which may be utilized to operate the devices of the invention in the manner previously described. In

this diagram the numerals I00 and I02 designate,

a pair of suitable power lines carrying normal voltage; such as 220 volts. In order to satisfactorily control the operation of the reversible motor 29, it is connected to the power lines I00 and I02 through a manually operable switch I03 by a line I04 and includes in its circuit contacts I05"- and I05 and I06 and MW, which are operated by coils I05 and I06, respectively, in a manner to be later described. The series field of the reversible motor 29 is designated in the line I04 at 29 The magnetic brake 34 for the reversible motor 29 is also connected in series in this line I 04, whereby it will be energized during the passage of current therethrough;

A line I I0 is connected between the power lines I00 and I02 and includes in its circuit contacts H2 H4 and H0 which form part of limit switches II2, II4 and H6, respectively; together with coil I06 which operates the contacts I06 and I00 of the motor 29. A line I20 is connected to the line II 0 between the contact 2 of the limit switch H2 and the power line I00, and to the line IIO between the coil I06 and the power line I 02. This line I20 has included in its circuit contacts I I2 and 4 and H6 which also form part of the limit switches H2, H4 and H6, respectively; together with a coil I05 which operates the contacts I05 and I05 of the motor 29.

Referring to Figure 9, the limit switch H2 is shown as comprising an operating arm which is spring-biased into connection with the contact II2 but operable by contact with the lower part of the mandrel bar carriage 8, while the latter is in its forward position, into connection with the contact H2. The limit switch H4 is shown as comprising an operating arm secured to the shaft 5| on the upper part of the vertical support 50. The energization of the fluid cylinder 55 will move the operating arm of the limit switch I I4 into connection with the contact I III and the deenergization of the fluid-cylinder 56 will permit the latch 52 on the shaft 5| to drop by gravity.

and move the operating arm into connection with the contact I I4 Referring to Figures 11, 12 and 13, the limit switch H6 is shown as comprising a screw I30 which is secured to and rotates with the shaft 33. This screw I30 carries a nut I32 which-is provided with a centrally depending ing which rides in a guideway I33 formed by part of the frame I5. Each side of the nut I32 is provided with a stud I34 which carries a pivotally mounted roller IIB. Each of the rollers III rides fora limited distance on a longitudinally adjustable contact strip which is mounted on, but suitably insulated from, the frame I5.. These contact strips form contacts I I6 and H6 which operate in a manner to be later described. According to the embodiment illustrated, the rollers I I3 will, when in extreme positions, connect either the contact I I6 or the contact H6, and permit a limited range of travel of the nut I32 during which both contacts will be connected.

While the mandrel bar carriage 3 is in its forward position, the contacts H2 and H4 of the limit switches H2 and H4, respectively, are closed, but the nut I 32 of the limit switch II3 occupies its extreme inward position on the shaft I30, thereby breaking connection with the contact H6 but continuing connection with the contact I I6. Therefore, the operating coil. I06 is now deenergized, thereby opening the contacts I 06 and I06 of the reversible motor 23. The coil I05 is at this time deenergized because the contacts II2 and H4 of the limit switches H2 and H4, respectively, are open. The foregoing position of elements is represented in the diagram of Figure 8 of the drawings.

As soon as the tube A has been completely pierced by the conjoint operation of the metalworking rolls 2 and 3 and the mandrel plug 5 on the forward end of the mandrel bar 4, the operator of the mill operates a suitable valve to fill the cylinder 56 with fluid under pressure, thereby raising the latch 52.

The raising of the latch 52 breaks the connec-,

tion of the limit switch II4 with its contact H4 and makes connection with its contact I I4. The operator then operates the reversing switch I for the reversible motor I2 to drive the same in such manner as to withdraw the mandrel bar carriage 0. This operation of the motor I2 is continued until the mandrel bar carriage 8 is in its extreme rearward position.

As soon as the mandrel bar carriage 0 begins its rearward movement caused by the operation of the reversible motor I2, the contact II2 of the limit switch H2 is closed by its operating spring I I2 In view of the fact that the limit switches H4 and H6 are at this time already connected with their contacts H4 and H6, respectively, the coil I05 is energized by the closing of the contact II2 of the limit switch II2, as just described, to close the contacts I05 and I05 of the motor 23. This connection of the motor 23 energizes, and therefore releases, the magnetic brake 34 and permits the former to withdraw the metalworking roll 3 from the position it previously occupied. The extent of this movement is short and determined by the distance required by the travel of the nut I32 to break the connection of the contact II6 with its contacting roller H6. The breaking of the connection of the limit switch II6 with the contact II6 deenergizes the coil I05, thereby opening the contacts I05 and I05 to deenergize the motor 23 and also the magnetic brake 34 which is then applied.

The foregoing operation of the devices included in the wiring diagram of Figure 8 is entirely independent of the operation of the motor I2, which, as before stated, is operated to withdraw the mandrel bar carriage I to its extreme rearward position either automatically or manually. When the mandrel bar carriage 8 is completely withdrawn, the reversible motor I2 is deenergized. The operator then operates the usual kick-off arms (not shown) to translate the tube A from the outlet bed of the mill whereupon it is permitted to roll over the skidway 6. The operator then restores the kick-off arms to their initial positions and operates the reversing switch I25 to drive the reversible motor I2 in such manner as to move the mandrel bar carriage 8 to its initial position. The reversing switch I25 is then operated to deenergize the reversible motor I2. If desired, the operation of the reversible motor I2 may be regulated by suitable limit switches (not shown).

As soon as the mandrel bar carriage 8 arrives at its proximate initial position, it operates the limit switch II2 to make connection with the contact H2 and break connection with the contact H2". At this time the latch 52 is either already in its lowermost position, or is then moved into such position by exhausting the fluid from the fluid-cylinder 56, whereupon it is permitted by gravity to drop. The lowering of the latch 52 operates the limit switch II4 to make connection 'with the contact H4". The limit switches H2 and H6 are in connection with the contacts H2 and II 6, respectively. Therefore, the closing of the contact II4 of the limit switch II4 now energizes the coil I06 which closes the contacts I06 and I06 of .the reversible motor 23. This energizes the motor 29 and also the magnetic brake 34 which is then released. The motor 23 then returns the metal-working roll 3 to its initial position.

As soon as the metal-working roll 3 is restored to its exactly proper initial position, the now outwardly traveling nut I32 breaks the connection of the limit switch II6 with the contact II6 but continues its connection with the contact H6". The breaking of the connection of the limit switch II6 with the contact H6 deenergizes the coil I06, thereby opening the contacts I06 and I0Ii to deenergize the motor 26 and also the magnetic brake 34 which is then applied.

The entire apparatus is thus set for another cycle of operation, which is initiated after the passage of a succeeding tube A through the mill.

In my copending application, Serial No. 147,128, entitled Pipe or tube mills" and filed concurrently herewith, there is disclosed and claimed an apparatus which eliminates the overrunning of the plug on the mandrel bar, whereby its impact with the metal-working rolls of the mill is prevented. In said copending application this result is obtained entirely by the control of the movement of the mandrel bar carriage.

While I have shown and described one specific embodiment of my invention, it will be understood that I do not wish to be limited exactly thereto, since various modifications may be made without departing from the scope of my invention, as defined by the following claims.

I claim:

.1. The method of making metallic pipes or tubes which include passing a metallic blank being position while the metal-working roll is withdrawn, and then returning the withdrawn metalworking roll to its metal-worlnng position.

2. A pipe or tube mill comprising, in combination, at least a pair of metal-working rolls, a mandrel, means for moving said mandrel toward and away from said metal-working rolls, releasable means for holding said mandrel in its metal-working {position against the thrust of the work-piece, means for withdrawing one of said metal-working rolls from its metal-working position, said withdrawing means being operable only when said releasable mandrel holding means is in released position, and means for returning said metal-working roll to its metalworking position, said returning means being operable only when said releasable mandrel holding means'is in holding position.

3. Apipe or tube mill comprisingdn'combination, at least a pair of metal-working rolls, a mandrel, means for moving said mandrel toward and away from said metal-working rolls, releasable means for holding said mandrel in its metal-working position against the thrust of the work-piece, means dependent upon the position of said first named means for withdrawing one of said metalworking rolls from its metal-working position, said withdrawing means being operable only when said releasable mandrel holding means is in released position, and means glep e ndentupon amazes releasable means for holding said mandrel in its metal-working position against the thrust of the work-piece, means operable by said first namied means for withdrawing one of said metal-working rolls from its metal-working position, said withdrawing means being operable only when said releasable mandrel holding means is in released position, and means for returning said metalworking roll to its metal-working position, said returning means being operable only when said releasable mandrel holding means is in holding position.

5. The method of making metallic pipes or tubes which includes passing a metallic blank between at least a pair of metal-working rolls and over a mandrel, withdrawing the mandrel from the interior of the tubular blank, withdrawing at least one of the metal-working rolls from its metal-working position, returning the mandrel to its metal-working position while the metal-working roll is withdrawn, and then returning the withdrawn metal-working roll to its metal-working position.

STEVENSON FINDLA'IER.

Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2528651 *Aug 25, 1948Nov 7, 1950Nat Tube CoTandem rotary expanding mill
US4646548 *Oct 12, 1984Mar 3, 1987Carrier CorporationTube expanding and grooving tool and method
Classifications
U.S. Classification72/14.2, 72/97
International ClassificationB21B25/02, B21B25/00
Cooperative ClassificationB21B25/02
European ClassificationB21B25/02