US2139551A - Extrusion press - Google Patents

Description

Dec. 6, 1938. o. z. KLOPS CH 5? AL EXTRUS ION PRESS 4 Sheets-Sheet 2 Original Filed March 23, 1936 FIG.4.

INVENTORS OTTO Z.KLOPSCH GUY H. BRADLEY hm,

A TTORNEYS Dec. 6, 1938.

0. Z. KLOPSCH ET AL EXTRUSION PREss Original Filed March 23, 1936 4 Sheets-Sheet 3 FIGJI.

m m T N CY awn W V D T. N M /.K.B.MA NH WW d Dec. 6, 1938.

0. z. KLOPSCH ET AL EXTRUSION PRESS Original Filed March 23 1936 4 Sheets-Sheet 4 S KLOPSCH 11v VENTOR OTTO Z. GUY H. BRADLEY MM 15 A TTORj VE Y s Patented Dec. 6, 1938 UNITED STATES ax-rausrou muss Otto Z. Klopsch and Guy H. Bradley, Pleasant Ridge, Mich., assignor to Wolverine Tube Company, Detroit, Mich., a corporation of Michig an Original application March 23, 1936, Serial No.

70,458; Divided and this application December 21, 1936, Serial No. 117,064 a 13 Claims.

This invention relates generally to metal working machines embodying a punch and refers more particularly to improved means for cooling the punch. This application is a division of our copending application Serial No. 70,458, filed March 23, 1936.

More specifically, the present invention contemplates cooling apparatus for use in association with an extrusion press to effectively cool the extruding tool subsequent to the extrusion operation, and has as one of its principal objects to provide a cooling device capable of being readily positioned in operative relation to the extruding tool immediately after the latter has perfomed its extruding force.

Another advantageous feature of the present invention consists in the provision of a cooling device supported on the extrusion press to one side of the extruding tool and capable of being readily swung to a position in the path of travel of the tool when it is desired to cool the latter.

A further object of the present invention resides in the provision of a cooling device having an extensible receptacle movable into the path of travel of the punch and operated by the punch upon relative movement of the latter and receptacle in one direction to distend suiiiciently to completely house the punch.

In addition, the present invention contemplates a cooling device having an extensible punch receiving receptacle which, when collapsed, has a depth less than the length of the punch to be cooled and being extensible upon movement of the same upwardly relative to the punch to house the portion of the tool to be cooled. This construction is advantageous in cases where the cooling device is positioned between the work holder and lower end of a reciprocable punch, since it permitsefiectively cooling the punch even though the travel of the punch from its uppermost position to the work holder is less than the length of the punch to be cooled. The-foregoingas well as other objects, will be made more apparent as this description proceeds, especially when considered in connection with the accompanying drawings, wherein:--

Figure l is a side elevational view of an extruding pressconstructed in accordance with this invention;

Figure 2 is a fragmentary sectional view illustrating the positions of the working parts of the apparatus prior to the extruding operation;

Figure 3 is a view similar to Figure 2, showing the relative position of the parts after the extruding operation;

Figure 4 is a similar sectional view showing the piercing die in its retracted position and illustrating the flange at the upper end of the tube resulting from the extruding operation;

Figure 5 is a fragmentary sectional view illustrating the severing punch in operative relation with respect to the apparatus;

Figure -6 is a view similar to Figure 5, showing the position of the severing punch just prior to removing the flange from the end of the tube;

Figure 7 is a fragmentary longitudinal sectional view illustrating the manner in which the severing punch is operated;

Figure 8 is a similar sectional view illustrating the relative position of the parts subsequent to the severing operation;

Figure 9 is a fragmentary sectional view illustrating the severing punch in its retracted position;

Figure 10 is a semi-diagrammatic plan view, partly in section, illustrating the mounting for the severing punch and showing the latter in its operative position;

Figure 11 is a view similar to Figure 10, showing the actuating means for the severing punch in its operative position;

Figure 12 is a fragmentary side elevational view of the apparatus showing the cooling means in operative position with respect to the piercing punch;

Figure 13 is a semi-diagrammatic plan view of the construction shown in Figure 12;

Figure 14 is afragmentary view similar to Figure 12, showing the cooling means in the position the same assumes during its operation;

Figure 15 is a cross sectional view through the cooling means; and

Figure 16 is a plan view of the construction shown in Figure 15. y

In general, a billet A is pre-heated to the proper temperature and is inserted into a container in seating relation with an extruding die. In accordance with conventional practice, the billet is urged toward the extruding die by means (not shown) adapted to exert a pressure on the upper end of the billet. Upon completion of this operation, the billet assumes the position thereof shown in Figure 2 andthe piercing punch 13 is actuated to successively pierce the billet A and extrude the latter through the die around the piercing punch B, in the manner clearly shown in Figure 3.

As a result of extruding the billet through the die, a flange 0 remains on the upper end of the extruded tube in engagement with the upper face of the die'and, after the piercing punch B has been returned to the position thereof shown in Figure 4, a shearing punch D is swung into the position thereof shown in Figure 5. The shearing punch D is then lowered relative to the piercing punch B to the position thereof shown in Figure 6, wherein the. cutter E at the lower end of the punch assumes an operative position with respect to the upper end of the extruded tube.

After the shearing punch has been moved to the position illustrated in Figure 6, a spacer F for the punch is moved to the position thereof shown in Figure 7, wherein the lower end of the actuator abuts the upper end of the shearing punch. Upon positioning the parts in the foregoing manner, the piercing punch B is lowered and during its downward travel, engages the upper end of the spacer F to move the cutting portion of the tool E at the lower end of the shearing punch through the extruding die, in the manner shown in Figure 8. Of course, movement of the cutter E through the extruding die, in the manner specified above, severs the flange C from the upper end of the extruded tube and permits the tube to drop out of the apparatus. Upon completion of the severing operation, the spacer F is returned to its inoperative position and the severing punch D is retracted from the billet container to the position thereof shown in Figure 9 and due to the particular construction of the cutting tool E, the flange C is removed from the billet container as a unit therewith.

The severing punch D is then swung to its inoperative position shown in Figure 13 and the quenching or cooling device G is swung to the position of the same shown in Figure 12 of the drawings. After the cooling device G is swung to the position aforesaid, the same is actuated to surround the piercing punch B, in the manner shown in Figure 14, and the cooling medium is sprayed, or otherwise discharged, upon the piercing punch.

Referring now more in detail to the particular construction of the apparatus briefly described above, it will be noted from Figure 1 that the piercing punch B is secured to a head 20 reciprocably mounted upon a frame 2| of the machine and actuated through the medium of a fluid pressure operated piston (not shown). The piercing punch comprises a stem 22 having a reduced threaded portion 23 at-the lower end for detachably receiving a punch head 24 provided with a frusto-conically shaped portion 25 at the lower end. The head 24 is apertured to receive the piercing pin 26 and serves to secure the latter to the lower end of the stem 22.

The stem 22 issecured to the lower end of the reciprocable slide 20 in alignment with a billet container 21 fixedly supported on the machine frame 2| and having the bore therethrough lined with a bushing 28 of a diameter predetermined to receive the piercing punch B. Upon reference to Figure 2, it will be noted that an extruding die 29 is secured within the lower end of the bushing 28, in such a manner that the opening 30 through the die is in perfect axial alignment with the piercing pin 26 so as to permit the latter to pass therethrough, in the manner shown in Figure 3. The extruding die 29 is supported on the machine frame through the medium of a fabricated structure designated generally herein by the reference character 3| and the several parts of this structure are provided with openings therethrough in alignment with the opening 30 through the extruding die to permit the billet A to be extruded around the piercing pin 26 to form the tube. Upon reference to Figures 2 to 9, inclusive, it will be noted that the upper surface of the extruding die 29 corresponds in shape to the frustoconical surface 25 of the punch head 24 and serves to form a similar surface on the lower end of the billet A during the initial step (not shown) of the method of manufacture previously described as exerting a pressure on the upper end of the billet A to .urge the same'into engagement with the extruding die 29. After this initial step of the operation has been effected, the head 20 is lowered and the billet A is pierced by the pin 26 and is extruded through the die 29 to form the tube designated in Figure 3 by the reference character 32.

It has been stated above that as a result of the extruding operation, a flange C is formed on the upper end of the tube 32 and that this flange is severed from the tube by means of the shearing punch D. The shearing punch D is shown in Figures 5 to 9, inclusive, as comprising a holder 33 carrying the cutter E at the lower end thereof and secured at the upper end to the free end of an arm 34. The opposite end of the arm 34 is provided with a boss 34' journalled on a vertical shaft 35 which, in turn, is supported by the free end of a bracket 36 having the opposite end journalled on a vertical shaft 31 supported on the machine frame for reciprocation in the direction of its axis. Upon reference to Figure 1. it will be noted that the lower end of the shaft.3'| has a piston 38 secured thereto and adapted to be actuated by fluid pressure admitted to the cyiinder 39 on the machine frame through the lower end of the cylinder.

Assuming that the shaft 31 is in its uppermost position and that the piercing punch B has been returned to its uppermost position subsequent to the extruding operation, the bracket 36, together with the arm 34, is swung inwardly to the position thereof shown in Figure 10 wherein the severing punch is in alignment with the bushing 28 of the billet container 21. In this connection, attention is called to the fact that the holder 33 for the cutter E and the free end of the arm 34 are slotted in the manner indicated in Figure 5 by the reference character 40' to receive the piercing 'pin 26. This construction is desirable in that it offers the possibility of reducing the extent of travel of the piercing punch B to the minimum and, at the same time, renders it possible to locate the severing punch D in its operative position beneath the piercing punch head 25.

When the severing punch D is in its operative position, or in the position thereof shown in Figure 5, the fluid pressure in the cylinder 39 is exhausted permitting the shaft 31 to return to its lowermost position by the action of gravity. Inasmuch as the severing punch D is carried by the bracket 36, which, in turn, is secured to the shaft 31, it necessarily follows that the severing punch D is moved downwardly as a unit with the shaft 31 and assumes the position thereof shown in Figure 6.

Movement of the vertical shaft 31 downwardly in the aforesaid manner also locates the spacer F in a position to permit the same to be swung inwardly to a position in alignment with the severing punch D. In this connection, it will be noted that the spacer F is carried at the free end of an arm 4|, similar to the arm 34 in that the opposite end is journalled on the shaft 35 above the arm 34. Upon reference to Figure 10, it will ing die." and the arm 4| is swung in the direc- 76 tion of the arrow 43 to locate the spacer F in alignment with the severing punch D. As shown in Figure 7, the spacer F and free end of the arm 4| are also slotted, as at 44, to receive the piercing pin 26. The slot 44 in the spacer F cooperates with the corresponding slot 40 in the shearing punch D to provide the minimum travel of the piercing punch B, and this is desirable in that it not only reduces the cost and weight of the apparatus, but also increases the speed of operation of the same.

When the spacer F is in the position thereof shown in Figure 7, the piercing punch B is lowered through the medium of the slide 26, causing the head 25 of the punch to engage the upper end of the spacer F and, since the lower end of the latter engages the upper end of the shearing punch B, it necessarily follows that continued downward movement of the piercing punch B efiects a corresponding movement of the shearing punch D. As the shearing punch D is moved downwardly, the tool E serves the flange C from the upper end of the extruded tube 32 and permits the latter to drop out of the apparatus. This latter operation is clearly shown in Figure 8 of the drawings, and it will be noted from this figure that the annular cutting portion 45 of the tool presents a shoulder 46 adapted to remove the flange C from the billet container upon movement of the shearing punch D to the position thereof shown in Figure 9. Before the shearing punch D is moved to the position shown in Figure 9, the slide 20 is returned to its uppermost position by means of fluid pressure operated pistons in the form of rods 41 connected at the upper ends to the slide and having the lower ends slidably mounted in the cylinders 48. After the slide 20 has been moved to its uppermost position, the spacer F is swung to its inoperative position and the shaft 31 is moved upwardly by admitting fluid pressure into the cylinder 39 beneath the piston 38. This action locates the shearing punch D in the position thereof shown in Figure 9 and permits the latter to be swung to its inoperative position.

Upon reference to Figure 13, it will be noted that in successively swinging the spacer F and shearing punch D to their inoperative positions, the former is swung in the direction of the arrow 49 shown in this figure and the latter is swung in the opposite direction. Inasmuch as the cooling device G is connected to the boss 34' of the shearing punch carrying arm 34 by means of an arm 50, it necessarily follows that movement of the arm 34 to its inoperative position against the stop 50', shown in Figures 10, 11 and 13, automatically positions the cooling device G in operative relationship to the piercing Punch B.

Upon reference to Figure 15, it will be noted that the cooling device G comprises, in general, two telescopically engaging units 5| and 62. The outer unit 5! is substantially cup-shaped and is supported upon the free end of the arm for vertical sliding movement relative thereto. The inner unit 52 is fixedly secured to the free end of the arm 50 and is operatively connected to the section 5| through the medium of springs 53.

The inner-unit 62 of the cooling device comprises atubular member 54 sleeved upon and permanently secured to an annular ring portion 55 on the free end of the arm 56 and having means 56 at one side cooperating with corresponding means 51 on an adjacent side wall of the unit 5| to guide the latter throughout its movement relative to the unit 62/ In addition,

the unit 52 is provided with an assembly 59 for receiving and spraying cooling medium upon the piercing punch B. In detail, the assembly 59 is supported within the annular collar portion 55, at the free end of the arm 50, in concentric relation with the tubular member 54 and is secured to the upper end of the collar portion by means of the anchoring brackets 60 for the springs 53. Asshown in Figure 15, the assembly 59 comprises a chamber 6i communicating with a source of fluid under pressure through the medium of a conduit 62 and having openings 63 in the side walls thereof for discharging the cooling medium against the piercing punch B. In addition, the assembly 59 is provided with a second chamber 64 spaced below the chamber 6| and communicating with a. source of cooling medium under pressure through the medium of a conduit 65. The chamber 64 comprises an annular detachable collar 66 at the lower end thereof having the side walls apertured, as at 61, to provide for discharging cooling medium against the piercing punch B. In actual practice, the discharge opening 63 provides for spraying cooling medium on the head 24 of the piercing punch while the openings 61 discharge the cooling medium on the piercing pin 26 of the piercing punch.

'As will be apparent from Figure 12, the two units of the cooling device are in their inoperative positions when swung into operative relation with the piercing punch B and are held in their inoperative positions by means of the springs 53. After the cooling device has been properly positioned with respect to the piercing punch B, the shaft 31 is raised causing a corresponding upward movement of the device G until the lower end of the Piercing pin 26 engages in a saddle 68 secured within the cup-shaped unit 5| on the bottom wall of the latter. As a result, the unit 5! is arrested and the unit 52 continues to move upwardly against the action of the springs 53 until the device is fully extended, or until the piercing punch is completely housed therein. The cooling medium under pressure is then discharged into the two chambers 6| and 64 surrounding the piercing punch and the latter is effectively cooled. It will be understood that the cooling medium is drained from the cooling device by means of aconduit shown in Figure 16. Upon completion of the cooling operation, the shaft 31 is again returned to its lowermost position by exhausting the cylinder 39, whereupon the springs 53 return the two units of the cooling device to the positions thereof shown in Figure 12. The cooling device may then be swung to its inoperative position and the arm 36 is preferably swung outwardly about the axis of the shaft 31 to permit the cycle of operation previously described to be repeated.

Although the cooling device previously described may be used to advantage in connection with various different types of punch presses, nevertheless, its use is particularly advantageous in machines wherein the stroke of the punch is reduced to the minimum. Asa matter of fact, in the present illustrative embodiment of the invention, the distance between the top of the work holder 21 and the lower end of the punch 26, in the uppermost position of the latter, is less than the length of the punch to be received by the cooling device. With the cooling device previously described, the collapsed height of the latter is less than the distance aforesaid so as to permit the device to be swung into the space between the work holder and punch when the latter is in its uppermost position. Notwithstanding the fact, however, that the collapsed height of the cooling device is sufliciently less than the portion of the punch to be cooled to permit positioning the device between the lower end of the punch and work holder, the punch is efiectively cooled by virtue of the fact that the device is extended upon movement of the same in an upward direction to receive the punch.

What we claim as our invention is:

1. In an extrusion press, a piercing tool, an extensible cooling device adapted to be supported in axial alignment with the punch and being extensible in the direction of length of the tool upon relative axial movement of the tool and device in directions toward each other to substantially house said punch.

2. In an extrusion press, an extruding tool, an extensible cooling device adapted to be supported in alignment with the tool for movement axially of the tool to receive the latter and having a portion cooperating with the tool to effect an extension of the device in .the direction of length of the tool.

3. In an extrusion press, an extruding tool, a cooling device comprising telescopically arranged parts adapted to be supported in alignment with the tool for movement axially of the tool in a direction to receive the same, means carried by one of the parts and engageable with the tool upon movement of the device toward the latter to effect an extension of said device, and means discharging a cooling medium against the tool.

4. In an extrusion press, a reciprocable extruding tool, a cooling device supported to one side of the tool for swinging movement about an axis parallel to the path of travel of the tool to a position in axial alignment with the tool, means for moving the device along said path of travel toward the tool to position the latter within the same, and means for discharging cooling medium against said tool. 7

5. In an extrusion press, an extruding tool, a cooling device comprising telescopically engaging parts and supported for swinging movement into a position in alignment with the tool to receive the latter upon relative movement of the tool and device toward each other, and means on one of the telescopically engaging parts engageable with the tool upon the relative movement aforesaid to extend said device.

6. In an extrusion press, an extruding die,

means for supporting stock on the die, a. member movable toward the die to force the stock therethrough, means for moving said member in a direction away from the die subsequent to the extruding operation, a cooling device supported to one side of the member and movable into the path of travel of the latter between the same and said die, and means for effecting relative axial movement of the member and cooling device to locate the former in the latter.

7. In a machine having a reciprocable punch,

a cooling device having an open ended receptacle supported to one side of the path of travel of the punch for movement into said path'of travel with the open end of the receptacle in registration with the punch, and means for effecting relative movement of the punch and cooling device toward each other along said path of travel to locate the punch within said device. I

8. In a machine having a reciprocable punch,

a cooling device having a receptacle extensible in the direction of the path of travel of the punch and supported to one side of the path of travel of the punch and movable into said path of travel, and means for relatively moving the punch and receptacle toward each other and eifective to extend the receptacle.

9. In a machine, a reciprocable punch, a cooling device having an extensible receptacle adapted to be supported in the path of travel of the punch and being extensible in the direction of the path of travel of the punch upon relative movement of the punch and receptacle toward each other to substantially house said punch.

10. In a machine, a reciprocable punch, a cooling device having an extensible receptacle movable into the path of travel of the punch and in its collapsed position having a depth less than the length of the punch to be cooled, and means efiective upon relative movement of the punch and receptacle toward each other to extend the receptacle to house the portion of the punch to be cooled.

11. In a machine, a work holder, a punch supported for reciprocation toward and away from the work holder, a cooling device having an extensible receptacle provided' with a depth less than the distance between the work holder and lower end of the punch when the latter is in its uppermost position, means supporting the receptacle for movement into the space between the work holder and lower end of the. punch when the latter is in its uppermost position, and means effective upon relative movement of the punch and receptacle toward each other to locate the punch within the receptacle and to extend the latter to completely house the portion of the punch to be cooled.

12. In a machine having a work holder, a punch movable toward and away from the work holder and having a length of travel from the uppermost position thereof to the top of the work holder less than the length of the punch to be cooled, a cooling device provided with an extensible receptacle having a collapsed height less than the distance between the top of the work holder and the lower end ofthe punch in its uppermost position, means for positioning the receptacle between the top of the work holder and lower end of the punch, and means for moving the cooling device in a direction toward the punch and for extending the receptacle to receive the length of the punch it is desired to cool.

13. In a machine having a work holder, a punch movable toward and away from the work holder and having a length of travel from the uppermost position thereof to the top of the work holder less than the length of the punch to be cooled, a cooling device provided with an extensl-- ble receptacle having a collapsed height less than the distance between the top of the work holder and the lower end of the punch in its uppermost position, means for positioning the receptacle between the top of the work holder and lower end of the punch, means for moving the receptacle in a direction toward the punch, and means on the receptacle engageable with the punch upon movement of the former toward the latter and eilfective to extend the receptacle to receive the portion of the punch it is desired to cool.

OTTO Z. KLOPSCH. GUY H. BRADLEY.

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