JP2004330289A - Wear plate, load supporting device, die cushion, and press machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To equalize cushion pins without using a large-scale hydraulic circuit and to reduce the production cost of a press machine. <P>SOLUTION: A sliding part 3, which slides with a bolt member 5 as a guide, is provided on one side of a wear plate 1, and an elastic member 6 for generating energizing force in the direction and the opposite direction of load by taking plied from the cushion pins 57 is provided in the sliding part 3. A cover part 4 is provided on one end of the sliding part 3, and the cover part 4 abuts on the cushion pins 57. In this structure, the load of the slide transmitted through the cushion pins 57 is supported with the sliding part 3, the cover part 4 and the elastic member 6. The other side of the wear plate 1 is attached to one side of a die cushion pad 21 and provided corresponding to respective cushion pins 57. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a wear plate and a load supporting device provided with an elastic member, a die cushion for equalizing a cushion pressure by using a plurality of the load supporting devices, and further relates to a press machine using the die cushion.
[0002]
[Prior art]
When performing press forming (particularly, deep drawing) using a die cushion, poor accuracy (tilt) of the blank holder, variation in the length of the cushion pin, parallelism error of the tie cushion pad holding the cushion pin, It is necessary to absorb the bending or tilting of the slide of the press machine and to make the wrinkle holding force (cushion pressure) of the work constant. For this reason, a cushion pin pressure equalizing device has been conventionally used. As such a cushion pin pressure equalizing device, for example, a device described in Patent Document 1 below is known.
[0003]
FIG. 9 is a cross-sectional view of a press machine using a conventional cushion equalizing device, and shows an example of a cushion pin equalizing device described in Patent Document 1 below. Hereinafter, the related art will be described with reference to FIG.
[0004]
In FIG. 9, an upper die 51 is fixed to a slide 52 of a press machine, and a lower die 53 is fixed to a bolster 54. The bolster 54 is supported by a carrier (corresponding to a press carrier 55 in Patent Document 1). In the lower mold 53, a blank holder (corresponding to the cushion pad of Patent Document 1) 56 is provided. The blank holder 56 is supported by upper ends of a plurality of cushion pins 57, 57..., And a lower end of each cushion pin 57 is supported by a cushion plate 69 of a die cushion 59 via hydraulic cylinders 58, 58. The die cushion 59 includes a cushion cylinder 61 that supports a cushion plate 69, and a predetermined air pressure determined by an air regulator 63 is supplied to the cushion cylinder 61 from an air pressure source 62 through an air tank 64. I have. Each of the hydraulic cylinders 58 is connected to an oil supply means 67 via a common pipe 65 and a flexible tube 66. The oil supply means 67 has a function of guaranteeing the amount of oil supplied to each of the hydraulic cylinders 58.
[0005]
According to the above configuration, when the work W is placed on the blank holder 56 and the slide 52 is lowered, the lowering force is transmitted to the die cushion 59 via the cushion pin 57, and the die cushion 59 is subjected to cushion pressure, that is, wrinkles. Generates pressing force. At this time, the hydraulic pressure generated in each hydraulic cylinder 58 at the lower end of the cushion pin 57 becomes constant because the hydraulic cylinders 58 communicate with each other, whereby the imbalance of the cushion pressure between the cushion pins 57 is absorbed. (That is, the pressure is equalized), and the wrinkle holding accuracy is improved.
[0006]
[Patent Document 1]
Japanese Utility Model Publication No. 5-27215 (page 1-2, FIG. 4)
[0007]
[Problems to be solved by the invention]
However, the conventional cushion pin pressure equalizer has the following problems. That is, in order to absorb the imbalance in cushion pressure between the cushion pins 57, the hydraulic cylinders 58 provided for each of the cushion pins 57 are connected to the refueling hand throw 67 via a common pipe 65 or an oil passage. There is a problem that a pressure equalizing hydraulic circuit is required, so that the cushion pin pressure equalizing device becomes large-scale and high in cost. In addition, in general, at the press production site, in addition to the press machine used for actual production, a press machine used at the time of test punching to determine molding conditions in advance before actual production is provided. Since the cushion pin pressure equalizing device is mounted on the machine, the required cost is doubled, and the problem of high cost cannot be neglected.
[0008]
Furthermore, in order to obtain high molding accuracy, it may be necessary to vary the wrinkle holding force for each location according to the shape of the same work even in the case of the same work. In this case, usually, as shown in FIG. Areas D1 to D4 divided into four around the center of the mold are provided, and four die cushions 59 having different cushion pressures for each of the areas D1 to D4 and a cushion pin equalizing device corresponding to each die cushion 59 are provided. And higher costs.
[0009]
The present invention has been made in view of such circumstances, and has as its object to reduce the manufacturing cost of a press machine by achieving cushion pressure equalization without using a large-scale hydraulic circuit.
[0010]
[Means for Solving the Problems, Functions and Effects]
Therefore, the first invention is
The wear plate includes support portions 3, 4, and 6 having elastic members 6, and supports loads applied from one direction by the support portions 3, 4, and 6.
[0011]
The second invention is
In a load supporting device provided on one surface of the die cushion pad 21 and supporting a load applied from a direction opposite to the one surface,
There is provided a support portion having an elastic member, wherein the load is supported by the support portions.
[0012]
The first and second inventions will be described with reference to FIG.
[0013]
On one surface of the wear plate (load support device) 1 is provided a sliding portion 3 that slides with the bolt member 5 as a guide, and the sliding portion 3 is provided with a direction of a load received from the cushion pin 57 and a direction opposite thereto. An elastic member 6 for generating a force is provided. A lid 4 is provided at one end of the sliding portion 3, and the lid 4 abuts on the cushion pin 57. With such a structure, the load of the slide transmitted through the cushion pin 57 is supported by the sliding portion 3, the cover 4, and the elastic member 6. The other of the wear plate 1 is attached to one surface of the die cushion pad 21 and is provided so as to correspond to each cushion pin 57.
[0014]
Each elastic member 6 is reduced by an amount corresponding to a variation in the length of each cushion pin 57, a parallelism error of the die cushion pad 21, and the like, and keeps the die cushion pad 21 horizontal. At this time, a difference occurs in the urging force of each elastic member 6. By setting the elastic coefficient of the elastic member 6 so that the difference in the urging force becomes smaller with respect to the cushion pressure level, the transmission of each wear plate 1 is performed. The pressure can be equalized.
[0015]
As described above, according to the first and second aspects of the present invention, the pressure can be equalized with a simple configuration in which the elastic member is provided on the die cushion pad side, so that a hydraulic circuit for equalizing is unnecessary, and the equalizing device is provided. Is a very simple configuration. For this reason, the manufacturing cost of the press machine can be reduced.
[0016]
When different cushion pressures are set for a plurality of areas of the mold, a cushion pressure difference generated between the plurality of areas may be set by making the elastic coefficients of the elastic members different. Therefore, only one die cushion needs to be provided in the press machine, and the manufacturing cost of the press machine can be reduced.
[0017]
Further, since a hydraulic circuit for equalizing pressure is not required, oil contamination, noise of hydraulic equipment, and the like are reduced, and the work environment at the work site can be improved.
[0018]
The third invention is
In the die cushion which receives the load applied via the plurality of cushion pins 57 with the die cushion pad 21,
A plurality of load supporting devices according to claim 2 are provided on one surface of the die cushion pad 21, and the load is supported by abutting each cushion pin 57 with each load supporting device.
[0019]
In addition, the fourth invention provides:
It is a press machine using the die cushion of the third invention.
[0020]
According to the third and fourth aspects of the present invention, the pressure applied from the cushion pin can be equalized by using the load supporting device having the elastic member, so that the molding accuracy such as deep drawing using the die cushion can be improved. .
[0021]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0022]
FIG. 1 is a sectional view of a press machine using the load supporting device according to the present invention.
In the press machine shown in FIG. 1, a wear plate is used as a load supporting device. Note that the same components as those shown in FIG. 9 are denoted by the same reference numerals, and description thereof will be omitted.
[0023]
As shown in FIG. 1, in a press machine, a workpiece W to be processed is provided between an upper die 51 on a slide 52 and a lower die 53 on a bolster 54. The lower part of the work W is supported by a plurality of cushion pins 57. Each of the cushion pins 57 is inserted into the lower mold 53 and the bolster 54, and one end of the cushion pin 57 contacts the work W via the blank holder 56, and the other end contacts the wear plate 1 on the die cushion pad 21. The bolster 54 is supported by the frame 30 via a carrier 55.
[0024]
The die cushion 20 is provided on the frame 30 side. The die cushion 20 is mainly composed of a die cushion pad 21, a cushion cylinder 22, and a stopper 23. A plurality of wear plates 1 corresponding to the respective cushion pins 57 are provided on the surface of the die cushion pad 21 on the bolster 54 side. Each cushion pin 57 is supported by the corresponding wear plate 1. The opposite surface of the die cushion pad 21 is supported by a cushion cylinder 22.
[0025]
The cushion cylinder portion 22 includes a cylinder 22 a provided on the die cushion pad 22 and a piston 22 b provided on the frame 30. A piston 22b is slidably inserted into the cylinder 22a, and a pressure chamber 22c is formed by the inner surface of the cylinder 22a and the end surface of the piston 22b. A predetermined air pressure determined by an air regulator 63 is supplied to the pressure chamber 22 c from an air pressure source 62 through an air tank 64.
[0026]
The stopper portion 23 includes a cylinder 23a and a nut 23b. The nut 23b and the die cushion pad 21 are connected by a rod 23c. A nut 23b is slidably inserted into the cylinder 23a. The cylinder 23a is filled with hydraulic oil, and when the nut 23b slides in the cylinder 23a in accordance with the operation of the die cushion pad 21, the hydraulic oil is squeezed between the cylinder 23a and the nut 23b. Therefore, the die cushion pad 21a is gently stopped at the top dead center.
[0027]
FIG. 2 is a sectional view of a press machine using the load supporting device according to the present invention.
FIG. 1 shows a state in which the workpiece W is placed, while FIG. 2 shows a state in which the mold is loaded and unloaded. At the time of loading and unloading the mold, the air in the pressure chamber 22c of the cushion cylinder portion 22 is discharged, and the die cushion pad 21 is located at the lowermost end. In this state, the cushion pin 57 and the wear plate 1 are separated. When the mold is carried out, the carrier 55 is removed from the frame 30, and the integrated upper mold 51, lower mold 53, bolster 54, carrier 55, blank holder 56, and cushion pin 57 are carried out. When the mold is carried in, the integrated upper mold 51, lower mold 53, bolster 54, carrier 55, blank holder 56, cushion pin 57 are carried in, and the carrier 55 is attached to the frame.
[0028]
FIG. 3 is a partial side cross-sectional view of the load supporting device according to the first embodiment, and FIG. 4 is a cross-sectional view taken along line AA of FIG.
Hereinafter, the wear plate 1 will be described with reference to FIGS. The wear plate 1 has a plate part 2, a sliding part 3, and a lid part 4.
[0029]
The plate portion 2 is formed of a plate-shaped member, and its material is hard enough to prevent perforation caused by contact with the sliding portion 3. The plate portion 2 is formed with a screw hole 2a having an annular stepped end surface 2b therein and two or more bolt holes 2c penetrating in the same direction as the central axis direction of the screw hole 2a. The screw hole 2a has a large diameter on the opening side with respect to the stepped end surface 2b. A screw 9a is formed at one end of the bolt 9, and a head 9b is formed at the other end. A screw hole 21 a is formed on the surface of the die cushion pad 21. The screw portion 9 a of the bolt 9 is inserted through the washer 10 and the bolt hole 2 c of the plate portion 2 and screwed into the screw hole 21 a of the die cushion pad 21. Then, the plate portion 2 is pressed against the die cushion pad 21 by the pressure of the bolt head 9 b transmitted through the washer 10.
[0030]
The sliding portion 3 is formed of a columnar (in this example, a columnar) member. At one end of the sliding portion 3, a screw hole 3e having a bottom surface 3b and a female screw 3a threaded on the inner peripheral surface is formed, and at the other end, a cylindrical hole 3c is formed. A through-hole 3d communicating the portion 3e and the hole 3c is formed. The screw hole 3e, the hole 3c, and the through hole 3d have the same central axis, and the screw hole 3e and the hole 3c have a larger diameter than the through hole 3d. An annular elastic member 6 and an annular spacer 7 are accommodated in the hole 3c in this order from the back. The elastic member 6 is made of an elastic body such as a disc spring, a spring, and a hard urethane material that generates an urging force when the length in the axial direction is reduced. Note that the elastic member 6 of the present embodiment is a disc spring.
[0031]
At one end of the bolt member 5, a screw portion 5a is formed, and at the other end, a small-diameter head 5b and a large-diameter head 5c are formed closer to the axial center than the small-diameter head 5b. An annular stepped end surface 5d is formed on the surface of the large-diameter head portion 5c on the central side in the axial direction. Further, an intermediate portion 5g having a smaller diameter than the large diameter head 5c and a slightly larger diameter than the screw portion 5a is formed between the large diameter head 5c and the screw portion 5a. An annular stepped end surface 5f is formed at the joint between the intermediate portion 5g and the screw portion 5a.
[0032]
The bolt member 5 is slidably inserted through the screw hole 3 e of the sliding portion 3 in the order of the through hole 3 d, the annular elastic member 6 and the annular spacer 7. It is screwed into the hole 2a. Then, the stepped end surface 5 d of the bolt member 5 comes into contact with the bottom surface 3 b of the sliding portion 3. When the screw portion 5a is further screwed in this state, the stepped end surface 5f of the bolt member 5 comes into contact with the stepped end surface 2b of the plate portion 2. In this state, the stepped end face 5d of the bolt member 5 presses the elastic member 6 via the sliding portion 3, so that an axial urging force of the bolt member 5 is generated. In other words, the sliding portion 3 is pressed against the stepped end surface 5d of the bolt member 5 by the urging force of the elastic member 6.
[0033]
The plate part 2, the sliding part 3, the bolt member 5, and the elastic member 6 are so formed that a gap of a predetermined distance L1 is formed between the end face of the sliding part 3 and the end face of the plate part 2 in a state where the urging force is generated. The dimensions of each part of the spacer 7 are designed. The distance L1 is such that when the set cushion pressure is applied to the cushion pin 1, the urging force and the cushion pressure corresponding to the reduced length (displacement amount) of the elastic member 6 are considered in consideration of the elastic coefficient of the elastic member 6. What is necessary is just to make it possible to balance and set the distance to allow for the displacement of the elastic member 6. According to the analysis of the applicant, it is considered that the distance L1 may be, for example, about 0.1 to 0.2 mm.
[0034]
The lid 4 is formed of a columnar (in this example, a columnar) member. A male screw 4a having the same diameter as the female screw 3a of the sliding portion 3 is formed on the outer peripheral surface of one end of the lid portion 4. The diameter of the male screw 4a is slightly larger than the diameter of the large-diameter head 5c of the bolt member 5 substantially at the center. Is formed. When the male screw 4a of the lid 4 is screwed into the female screw 3a of the sliding part 3, the hole 4b of the lid 4 is slidably inserted into the outer peripheral surface of the large diameter head 5c of the bolt member 5, A grease collecting chamber 8 is formed between the inner peripheral surface of the hole 4b of the cover 4 and the outer peripheral surface of the small diameter head 5b of the bolt member 5. Grease is sealed in the grease reservoir 8 from an injection port (not shown). An end of the cushion pin 57 contacts the other end of the lid 4.
[0035]
As shown in FIG. 4, two cutout end faces 5 e, 5 e parallel to each other are formed on the outer peripheral surface of the small diameter head 5 b of the bolt member 5. Two notched end faces 4c, 4c are formed. These notch end faces 5e, 5e and notch end faces 4c, 4c are for applying a tool such as a wrench at the time of attachment and detachment.
[0036]
The operation of the above configuration will be described with reference to FIGS.
[0037]
When the slide 52 of the press machine is lowered, the upper die 51 first contacts the work W. The upper die 51 presses the work W, the blank holder 56, the cushion pin 57, the wear plate 1 and the die cushion pad 21, and descends together with the work W, the blank holder 56, the cushion pin 57, the wear plate 1 and the die cushion pad 21, and The work W is formed between the mold 51 and the lower mold 53. The load when the slide 52 descends is transmitted to each wear plate 1 that supports each cushion pin 57. The lid 4 and the sliding part 3 of the wear plate 1 are pressed against the plate part 2 by this load, and slide with the bolt member 5 as a guide. At this time, the elastic member 6 is reduced.
[0038]
The reduction of the elastic member 6 absorbs variations in the length of the cushion pin 57 and variations in the cushion pin axial position in consideration of the parallelism error of the die cushion pad 21 and the like. The reduced length of the elastic member 6 is determined according to the variation in the position of the cushion pin in the axial direction. Then, an urging force corresponding to the reduced length of each elastic member 6 is generated for each wear plate 1, and the variation of the urging force of the elastic member 6 for each wear plate 1 is caused by the variation of the cushion pressure of each wear plate 1. Is equivalent to Here, if the elastic coefficient of the elastic member 6 is set such that the variation of the urging force of the elastic member 6 becomes negligible with respect to the level of the set cushion pressure of the die cushion 20, the transmission pressure of each wear plate 1 is set. Is equalized. Thereby, the wrinkle holding force of each cushion pin 57 can be made substantially constant, and the molding accuracy can be improved.
[0039]
The upper end of the cushion pin 57 may be directly applied to the work W.
[0040]
Further, the sliding portion 3 and the lid 4 of the wear plate 1 do not need to be cylindrical, and the diameter of the lid 4 may be larger than the diameter of the sliding portion 3, for example.
[0041]
According to the first embodiment, a die cushion is provided in which the cushion pressure is equalized by interposing the wear plate 1 having the elastic member 6 that generates an urging force in the direction of the load received from the cushion pin 57 and the opposing direction. Therefore, a hydraulic circuit for pressure equalization is not required, and the pressure equalizing device has a very simple configuration. For this reason, the manufacturing cost of the press machine can be reduced.
[0042]
When different cushion pressures are set for each of a plurality of areas (D1 to D4) of the mold as shown in FIG. 10, the main cushion pressure is set by the cushion cylinder portion 22 of the die cushion 20, and between the plurality of areas. The generated cushion pressure difference may be set by making the elastic coefficient of the elastic member 6 of each wear plate 1 different. Therefore, only one die cushion needs to be provided in the press machine, and the manufacturing cost of the press machine can be reduced.
[0043]
Further, since a hydraulic circuit for equalizing pressure is not required, oil contamination, noise of hydraulic equipment, and the like are reduced, and the work environment at the work site can be improved.
[0044]
FIG. 5 is a partial side cross-sectional view of the load support device according to the second embodiment.
In the second embodiment, one plate portion 2 is provided with a plurality of sliding portions 3 and a lid portion 4. The configurations of the sliding part 3 and the lid part 4 are the same as in the first embodiment.
[0045]
FIG. 6 is a partial side cross-sectional view of the load support device according to the third embodiment.
In the third embodiment, a columnar hard urethane 6 'is used as an elastic member. One end of the hard urethane 6 'is fitted into a hole 2'a formed in the plate portion 2', and one end surface of the hard urethane 6 'and the bottom surface of the hole 2'a are in contact. On the other hand, the other end of the hard urethane 6 'is fitted into a hole 4'a formed in the lid 4', and the other end surface of the hard urethane 6 'is in contact with the bottom surface of the hole 4'a. In this state, a gap of a predetermined distance L1 is provided between one end surface of the lid portion 4 'and one end surface of the plate portion 2'. The other end surface of the cover 4 ′ is in contact with the cushion pin 57.
[0046]
FIG. 7 is a partial side cross-sectional view of the load support device according to the fourth embodiment.
The fourth embodiment uses a cylindrical hard urethane 6 'as an elastic member as in the third embodiment. However, in the fourth embodiment, a lid is not provided, and the end surface of the hard urethane 6' is not provided. Directly contact the cushion pin 57. In this state, a gap of a predetermined distance L1 is provided between the end face of the cushion pin 57 and one end face of the plate portion 2 '. The diameter of the hard urethane 6 'is smaller than the diameter of the cushion pin 57. However, the diameter of the hard urethane 6 'may be larger than the diameter of the cushion pin 57. In this case, there is no need for a gap provided between the end of the cushion pin 57 and one end of the plate portion 2 '.
[0047]
FIG. 8 is a partial side cross-sectional view of the load support device according to the fifth embodiment.
In the fifth embodiment, the bolt member 5 is directly screwed to the die cushion pad 21 without the plate portion 2 in the first embodiment. The screw portion 5 a of the bolt member 5 is screwed into a screw hole 21 b formed on the surface of the die cushion pad 21. In this state, a gap of a predetermined distance L1 is provided between the end surface of the sliding portion 3 and the surface of the die cushion pad 21. In this case, it is necessary to make the surface of the die cushion pad 21 hard enough to prevent perforation caused by contact with the sliding portion 3.
[0048]
According to the second to fifth embodiments, the same effects as those of the first embodiment can be obtained.
[Brief description of the drawings]
FIG. 1 is a sectional view of a press machine using a load supporting device according to the present invention.
FIG. 2 is a sectional view of a press machine using the load supporting device according to the present invention.
FIG. 3 is a partial side sectional view of the load support device according to the first embodiment.
FIG. 4 is a sectional view taken along line AA of FIG. 3;
FIG. 5 is a partial cross-sectional side view of a load support device according to a second embodiment.
FIG. 6 is a partial side sectional view of a load support device according to a third embodiment.
FIG. 7 is a partial side sectional view of a load support device according to a fourth embodiment.
FIG. 8 is a partial side sectional view of the load support device according to the first embodiment.
FIG. 9 is a sectional view of a press machine using a conventional cushion pressure equalizer.
FIG. 10 is an arrangement example of a hydraulic cylinder of a conventional cushion pressure equalizing device.
[Explanation of symbols]
2 plate part 3 sliding part 4 lid part 5 bolt member 6 elastic member 21 die cushion pad 57 cushion pin

Claims (4)

A wear plate comprising a support portion (3, 4, 6) having an elastic member (6), wherein a load applied from one direction is supported by the support portion (3, 4, 6). In a load supporting device provided on one surface of the die cushion pad (21) and supporting a load applied from a facing direction of the one surface,
A load supporting device comprising a support (3, 4, 6) having an elastic member (6), wherein the load is supported by the support (3, 4, 6). In a die cushion receiving a load applied via a plurality of cushion pins (57) by a die cushion pad (21),
A die comprising a plurality of load supporting devices according to claim 2 provided on one surface of said die cushion pad (21), wherein each of said cushion pins (57) abuts against each of said load supporting devices to support said load. cushion. A press machine using the die cushion according to claim 3.

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