JPH0634817U - Pushback press machine - Google Patents

Abstract

(57) [Abstract] [Purpose] It is an object of the present invention to provide a pushback type press device capable of compensating the flatness of a punched material. [Structure] A lower die ejector that is supported by a lower die table that guides a plate material to be lifted and is urged in an ascending direction, moves up and down with respect to this lower die ejector, and after contacting the lower die ejector, this The lower die ejector and the upper die punch have a lower die ejector and an upper die punch in a pushback type press device having a punching contact surface that comes into contact with the front and back of a plate material to be processed. A push-back press device in which the punching contact surfaces of the punches have a convex taper surface and a concave taper surface, respectively, where the lower ejector and the upper punch have a higher center side.

Description

[Detailed description of the device]

[0001]

【Technical field】

 The present invention relates to a pushback type press device that temporarily returns a punched material to a punched hole of a plate material to be processed.

[0002]

[Prior art and its problems]

 The push-back type press machine sandwiches the plate material to be processed between the lower die punch and the lower die ejector to perform punching work, and then the lower die ejector urged in the ascending direction It is a device for returning a punched material punched from a plate material to a punching hole of the plate material to be processed. In this press machine, the stamped material is removed from the punched hole again at any step after the punching process to obtain a press-molded product.

However, the inventor of the present invention has found that the punching material punched by the pushback type press device has a problem that the flatness is impaired. In particular, when the plate material to be processed is a relatively soft material such as an aluminum alloy, the flatness is greatly impaired.

[0004]

[The purpose of the device]

 The present invention has been made in view of the above problems of the pushback type press device, and an object of the present invention is to provide a pushback type press device capable of compensating for the flatness of a punched material. There is.

[0005]

[Outline of the device]

 The present invention that achieves the above-mentioned object is a lower die ejector which is supported by a lower die table that guides a plate material so as to be able to move up and down, and is urged in an ascending direction. It has an upper die punch that raises and lowers the ejector after contacting it. The lower die ejector and the upper punch have a punch-back press device that has punching contact surfaces that come into contact with the front and back of the plate material to be processed. In the above, the punching contact surfaces of the lower die ejector and the upper die punch are respectively characterized by a convex taper surface and a concave taper surface on the center side of the lower die ejector and the upper die punch.

[0006]

[Example of device]

 The present invention will be described below with reference to illustrated embodiments. FIG. 1 is a front sectional view showing an entire push-back type press device 11 to which the present invention is applied. The push-back type press device 11 has a lower mold base 13 for guiding the plate material 12 to be processed, and an upper mold base 15 supported on the lower mold base 13 via an elevating part 14 so as to be able to move up and down. It The lower mold base 13 has a lower mold ejector 16 which is biased in the ascending direction, and the upper mold base 15 moves up and down with respect to the lower mold ejector 16, and after contacting the lower mold ejector 16, both It has an upper die punch 17 for raising and lowering. When the upper mold base 15 approaches the lower mold base 13, the guide pins 18 of the upper mold base 15 are inserted into the guide bushes 19 of the lower mold base 13. The lower die ejector 16 is slidably fitted in the cutting hole 23 of the lower die stand 13, and the upper die punch 17 is slidably fitted in the cylinder portion 24 of the upper die stand 15. ing. Reference numeral 27 in FIG. 1 denotes a guide roller that guides the plate material 12 to be processed that is fed in the direction perpendicular to the paper surface from the back side of the paper surface to the front side.

FIG. 3 is a side sectional view of the pushback type press device 11, and FIG. 7 is a plan view showing the lower die stand 13. The lower die table 13 has the cutting hole 23, the recess 25, and the punched material dropping hole 22 formed along the flow direction of the plate material 12 to be processed. A cylinder portion 26 into which the punching punch 21 is slidably fitted is formed at a position corresponding to the punching material dropping hole 22 of the upper mold base 15.

The lower die ejector 16 and the upper die punch 17 respectively have punching contact surfaces 16 a and 17 a that come into contact with the front and back surfaces of the plate material 12 to be processed. As shown in FIG. 2, the punching contact surfaces 16a and 17a are formed as a convex taper surface and a concave taper surface, respectively, on which the center sides of both punches 16 and 17 are high. The convex tapered surface (16a) and the concave tapered surface (17a) can be set, for example, at angles a and b from the horizontal plane h of less than 1 °, for example, around 40 '. The punching material 20 which is punched from the plate material 12 by the lower die ejector 16 and the upper die punch 17 has a circular hole 28 (FIG. 6) formed in the central portion thereof in the process before punching. When punched, it becomes an annular plate material.

In the push-back type press device 11 having the above-described configuration, the upper mold base 15 is brought into contact with and separated from the lower mold base 13 at a predetermined timing, and the plate material 12 to be processed has a circular hole 28 and a cam. The grooves 29 and the like are formed along the flow direction. Then, when the portion where the circular hole 28 and the cam groove 29 are formed reaches the punching position by the upper die punch 17, the upper die punch 17 descends toward the workpiece plate 12 at the position, and the workpiece plate 12 is cut. The punching contact surface 17 a is brought into contact with the surface of 12. At this time, since the punching contact surface 16a of the lower die ejector 16 is in contact with the back surface of the plate material 12 to be processed, the front and back of the plate material 12 is sandwiched between the lower ejector 16 and the upper punch 17.

From this state, the upper die punch 17 punches out the plate material 12 having the circular holes 28, descends together with the lower die ejector 16 biased in the ascending direction, and then ascends again to the lower die ejector. The punching material 20 sandwiched by 16 and 16 is returned to the punching position where the plate material 12 to be processed is located. The punching material punched out by the conventional pushback type press machine is mainly warped upward to impair its flatness. Is punched in a state in which it is sandwiched between the punched contact surface 16a having a convex tapered surface shape and the punched contact surface 17a having a concave tapered surface shape, so that the force of warping upward causes the contact force to warp in the opposite direction. It is offset by the clamping force between the surfaces 16a and 17a. Therefore, the punching material 20 is punched without significantly impairing its planarity, and is returned from that state to the punching hole 30 of the plate material 12 to be processed located at the punching position.

The punched material 20 after punching is returned to the punching hole 30 of the plate material 12 to be processed, passes through the recess 25, and is punched out when it is positioned in the punching material drop hole 22. It is pressed by the punch 21 and dropped as a press-molded product into the punching material dropping hole 22.

[0012]

[Effect of device]

 As described above, according to this pushback type press device, the punching contact surfaces of the lower die ejector and the upper die punch have the convex taper surface and the concave taper surface, respectively, which are higher on the center side of both punches, so that the punched punching Very little loss of flatness. In particular, even when the plate material to be processed is a relatively soft material such as an aluminum alloy, a press-formed product can be manufactured without significantly impairing the flatness.

[Brief description of drawings]

FIG. 1 is a front cross-sectional view showing an entire pushback type press device to which the present invention is applied.

FIG. 2 is an enlarged cross-sectional view showing tapered punching contact surfaces formed on an upper die punch and a lower die ejector, respectively.

FIG. 3 is a side view showing a state in which the upper die punch of the pushback type press device is brought into contact with the lower die ejector, as seen from the direction of arrow A in FIG. 1.

FIG. 4 is a front cross-sectional view showing an upper mold base in an enlarged manner.

FIG. 5 is a front cross-sectional view showing an enlarged lower mold base.

FIG. 6 is a plan view showing a plate material to be processed on a lower mold base.

FIG. 7 is a plan view showing a lower mold base.

[Explanation of symbols]

 11 Push Back Type Press Device 12 Work Plate Material 13 Lower Die 14 Elevator 15 Upper Die 16 Lower Die Ejector 16a 17a Punching Contact Surface 17 Upper Die Punch 20 Punching Die 22 Punching Die Drop Hole 23 Cutting Hole 27 Guide Roller 28 Circular hole

Claims (3)

[Scope of utility model registration request] 1. A lower die ejector, which is supported by a lower die stand for guiding a plate material to be lifted and is urged in an ascending direction; and a lower die ejector which is raised and lowered with respect to the lower die ejector and after contacting the lower die ejector. In the pushback type press device having a punching contact surface for contacting the front and back of the plate material to be processed. The punching contact surfaces of the ejector and upper die punch are respectively
A push-back type press device characterized in that a convex taper surface and a concave taper surface are provided so that the center side of the lower die ejector and the upper die punch is high. 2. The pushback type press device according to claim 1, wherein the angle of each of the concave tapered surface and the convex tapered surface from the horizontal plane is less than 1 °. 3. The push-back type press device according to claim 1, wherein the punching material punched from the plate material to be processed by the lower die ejector and the upper punch is an annular plate material.