JP2009279589A - Press device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide side pin structure which is suitable to a high-speed press. <P>SOLUTION: A recessed part 41 which takes a large diameter D1 larger than the outside diameter d1 of the tip part 21 of a side pine 20 as an inside diameter is provided on a pad 40 and the tip part 21 of the side pin 20 is inserted into the recessed part 41. The tip part 21 of the side pin 20 is provided with an elastic body 27 to cover the pin main body 25, a cover member 28 to cover the elastic body 27 and specify the outside diameter of the tip part 21 of the side pin and a retaining member 32 which is mounted to the pin main body 25 in order to prevent the cover member 27 from slipping off. In the process where an upper die is elevated, when the tip part of the side pin hits against the pad, impact energy is generated and the impact energy is mitigated by the deflection of the elastic body. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an improvement of a side pin of a press device.

A press apparatus in which an upper die and a pad are connected by a side pin has been put to practical use (for example, see Patent Document 1).
JP 63-33126 A (FIG. 1)

Patent document 1 is demonstrated based on the following figure.
FIG. 10 is a cross-sectional view showing the main part of a conventional press apparatus. A side pin 102 is horizontally provided on an upper mold 101 that moves up and down, and a pad 103 is attached to the side pin 102 so as to be moved up and down.

The figure shows the state at the end of the pressing process, that is, the state where the upper die 101 is at the bottom dead center, and there is an L clearance between the side pin 102 and the pad 103 in the height direction.
The upper mold 101 is raised from this state to the top dead center. In the process, the clearance L gradually decreases, and when the clearance becomes zero, the side pin 102 engages with the pad 103. Thereafter, the pad 103 rises together with the upper mold 101.

  In recent years, the development of high-speed presses has been promoted for the purpose of improving productivity, and the moving speed (upward speed) of the upper mold from the bottom dead center to the top dead center is increased to about 1.5 times or more than the conventional one. Need came out.

In the conventional structure described above, when the rising speed of the upper mold 101 is increased, in the figure, a depression due to a dent is generated in the a part of the pad 103, and a depression is generated in the b part of the side pin 102. Cracks occurred in part c. With this structure, high-speed pressing is difficult.
Therefore, a structure suitable for high-speed press is required.

  An object of the present invention is to provide a side pin structure suitable for high-speed pressing.

According to the first aspect of the present invention, a side pin is horizontally provided on the upper mold that moves up and down, a pad is attached to the side pin, and a recess having a diameter larger than the outer diameter of the tip of the side pin is provided in the pad. In the press device which is configured to hold the pad so as to be movable up and down with the side pin by inserting the tip of the side pin into
The tip of the side pin has an elastic body disposed on the outer periphery of the pin body, a cover member that covers the elastic body and defines the outer diameter of the tip of the side pin, and prevents the cover member from coming off. For this purpose, a retaining member attached to the pin body is provided.

  In the invention according to claim 2, the cover member includes a cylindrical portion extending parallel to the axis of the pin main body, and a front lowering portion extending from the front and rear of the cylindrical portion to a position away from the pin main body so as to sandwich the elastic body. And a U-shaped cross section composed of a rear falling part.

  The invention according to claim 3 is characterized in that a gap is provided between the front lowering portion and the elastic body and between the rear lowering portion and the elastic body.

  The invention according to claim 4 is characterized in that the elastic body has a ring shape that fits on the outer periphery of the pin body, and the cover member has a cup shape.

  The invention according to claim 5 is characterized in that the elastic body has a roller shape extending in the axial direction of the pin main body, and the cover member has a cup shape and has an arc groove that houses the elastic body.

  The invention according to claim 6 is characterized in that the elastic body has a spherical shape, and the cover member has a cup shape and has a spherical concave portion for accommodating the elastic body.

In the invention according to claim 1, the pin body is covered with an elastic body, and the elastic body is covered with a cover member.
When the tip of the side pin hits the pad in the process of raising the upper mold, impact energy is generated. This impact energy is absorbed by the elastic body being bent. As a result, the impact force applied to the pad and the side pin can be sufficiently reduced, so that the formation of a dent in the pad and the generation of a dent in the side pin can be prevented.

  In the invention which concerns on Claim 2, a cover member exhibits the U-shaped cross section which has a front part falling part and a rear part falling part. The elastic body is prevented from moving forward at the front lowering portion, and the elastic body is prevented from moving rearward at the rear lowering portion. As a result, the elastic body can be held at an appropriate position.

  In the invention which concerns on Claim 3, the clearance gap was provided between the front part fall part and the elastic body, and between the rear part fall part and the elastic body. When the elastic body is compressed, it swells in the axial direction of the side pin. Allow the elastic body to bulge in the gap. As a result, the degree of freedom of deformation of the elastic body is increased, and the life of the elastic body can be extended.

In the invention which concerns on Claim 4, an elastic body exhibits the ring shape fitted to the outer periphery of a pin main body, and the cover member is exhibiting the cup shape.
Since the elastic body is a ring, the shape is simple and the manufacturing is easy, and the manufacturing cost of the side pin can be reduced.

In the invention which concerns on Claim 5, an elastic body exhibits the roller shape extended in the axial direction of a pin main body, and the cover member has a circular arc groove which accommodates an elastic body while exhibiting a cup shape.
It is easy to adjust the impact absorption force by the contact area between the elastic body, the pin main body, and the cover member.

In the invention according to claim 6, the elastic body has a spherical shape, and the cover member has a cup shape and a spherical concave portion that houses the elastic body.
It is possible to adjust the impact absorption force in more detail by using the spherical elastic body.

The best mode for carrying out the present invention will be described below with reference to the accompanying drawings.
Claim 1 will be described with reference to FIGS. 1 to 9, claims 2 and 3 will be described with reference to FIGS. 2 to 3, claim 4 with reference to FIGS. 3 and 6, and claim 5 with reference to FIG. 8 and FIG. 8 is described with reference to FIG.

  FIG. 1 is a cross-sectional view of a main part of a press device according to the present invention. The press device 10 has a side pin 20 attached horizontally to an up-and-down upper mold 11 and a pad 40 attached to the side pin 20. A recess 41 having a diameter larger than the outer diameter of the tip 21 is provided in the pad 40, and the tip 21 of the side pin 20 is inserted into the recess 41.

FIG. 2 is an exploded view of the main part of the press device, and the upper die 11 has a pin hole 12 formed horizontally.
Further, the side pin 20 includes a key plate groove 22 at the tail, a small diameter portion 23 at the tip, and a pin main body 25 in which a female screw portion 24 is provided at the small diameter portion 23. A disc having a rectangular cross section and a ring-shaped elastic body 27, a cover member 28 for housing the elastic body 27, a male screw 29 corresponding to the female thread portion 24, and a tool hole 31 into which a tool is inserted. And a retaining member 32 having a shape.

  The retaining member 32 may be fixed to one end of the pin body 25 with a plurality of bolts or screws. In this case, the retaining member 32 may be a disc having a plurality of bolt holes. Alternatively, the retaining member 32 may be provided with a large female screw portion, a male screw portion may be provided at the tip of the small diameter portion 23, and the retaining member 32 may be fixed by screw connection. Therefore, the retaining member 32 may be any member as long as it exhibits the retaining action of the cover member 28, and the form is arbitrary.

  The elastic body 27 is preferably urethane, and polyester urethane is particularly preferable because it has a Shore A hardness of about 90, a tear strength of about 90 kN / m, and excellent wear resistance and strength characteristics. However, any material can be used as long as it is an equivalent elastic body.

  The cover member 28 has a U-shaped cross section including a cylindrical portion 34 extending parallel to the longitudinal axis of the pin body 25, and a front lowering portion 35 and a rear lowering portion 36 that are lowered from the front and rear of the cylindrical portion 34. And The cover member 28 is preferably made of alloy tool steel (JIS-SKD11) because of its high wear resistance.

FIG. 3 is an assembly diagram of FIG. 2, and the side pin 20 inserted into the upper mold 11 from the right side of the figure is fixed to the upper mold 11 by the key plate 13.
A recessed portion 41 having an inner diameter D1 larger than the outer diameter d1 of the distal end portion 21 of the side pin 20 is provided in the pad 40, and the distal end portion 21 of the side pin 20 is inserted into the recessed portion 41.

The tip portion 21 of the side pin 20 includes an elastic body 27 that covers the small diameter portion of the pin main body 25, a cover member 28 that covers the elastic body 27 and defines the outer diameter of the tip portion 21 of the side pin, and the cover member And a retaining member 32 attached to the pin main body 25 for retaining the retaining member 27.
Defining the outer diameter means that the outer diameter d1 of the distal end portion 21 is determined by the cover member 28.

  The front lowering portion 35 and the rear lowering portion 36 are extended to a position away from the pin body 25 (small diameter portion). Therefore, the elastic body 27 is compressed until the front lowering portion 35 or the rear lowering portion 36 comes into contact with the pin main body 25 (small diameter portion), that is, within the range of the clearance M, and impact energy is absorbed by this compression.

Furthermore, gaps C and C are provided between the front lowering portion 35 and the elastic body 27 and between the rear lowering portion 36 and the elastic body 27.
When the elastic body 27 is compressed, it swells in the axial direction of the side pin 20. The elastic body 27 is allowed to bulge in the gaps C and C. As a result, the degree of freedom of deformation of the elastic body 27 increases, and the life of the elastic body 27 can be extended.

Next, the operation of the side pin having the above configuration will be described.
In the description of the operation, first, a comparison with a normal pressed high-speed press will be made, and then the operation of the side pin of the present invention will be described.
FIG. 4 is a graph showing the results of a comparative test. When an impact force applied to a side pin (see FIG. 6 for the structure; no elastic body) is measured in a normal press (ascending speed is 500 to 700 mm / s), a broken line is obtained. The data indicated by

  When the impact force applied to the side pin (without elastic body) was measured in a high-speed press (the rising speed was about 1.5 times that of the normal breath), data indicated by a solid line was obtained. Considering the damage to the side pins and pads, it is desirable that the maximum value of the impact force in the high-speed press be kept at the maximum value in the normal press.

Therefore, the impact force was specifically measured for the side pin 20 having the structure of FIG.
FIG. 5 is a graph showing the relationship between urethane thickness and impact force.
In the high-speed press, the impact force applied to the side pin (FIG. 3) is measured.
The thickness of the elastic body was measured as T, 1.5 × T, and 2 × T.
As shown in the figure, when the thickness of the elastic body is T, the impact force was large, but it was almost the same as the maximum value of the impact value in the normal breath shown in FIG.

  When the thickness of the elastic body was 1.5 × T, the impact force was reduced, and when the thickness of the elastic body was 2 × T, the impact force was further reduced.

Next, another embodiment of the side pin will be described with reference to FIGS.
FIG. 6 is a view showing an example of a side pin in which the form of the cover member is changed. The side pin 20B has a key plate groove 22 at the tail and a small diameter portion 23 at the tip, and the small diameter portion 23 has a female screw. A pin main body 25 provided with a portion 24, a ring-shaped elastic body 27 fitted in the pin main body 25 and having a rectangular cross section, a cup-shaped cover member 28B for housing the elastic body 27, and the cover member 28B includes a retaining member 32B that holds the pin main body 25 so that it does not come off.

  The retaining member 32 </ b> B includes a holding plate 44 having a boss 42 and a flange 43, and a screw 45 for screwing the holding plate 44 to the female screw portion 24. The length of the boss 42 is determined so that a gap t is opened between the cover member 28 </ b> B and the flange 43. The presence of the gap t enables the cover member 28B to move up and down in the drawing.

  FIG. 7 is a view showing an example of a side pin in which the form of the elastic body is changed. The side pin 20C is provided with a key plate groove 22 at the tail portion and a small diameter portion 23 at the tip, and the small diameter portion 23 has a female screw. A pin main body 25 provided with the portion 24, an elastic body 27C fitted to the pin main body 25, a cup-shaped cover member 28C for housing the elastic body 27C, and the cover member 28C coming off from the pin main body 25. It consists of a retaining member 32C that holds it down. Since the structure and operation of the retaining member 32C are the same as those of the retaining member 32B in FIG. 6, detailed description thereof is omitted.

  8 is a cross-sectional view taken along line 8-8 in FIG. 7, and the elastic body 27C has a roller shape (cylindrical shape). In order to stably store such an elastic body 27C, the cover member 28C is provided with a necessary number of arc grooves 46. Preferably, the required number of arc grooves 47 are also provided in the small diameter portion 23 of the pin body. Thus, the cover member 28C can move up and down in the drawing. The elastic body 27 </ b> C may be connected to each other by a thin band 48. When connected with a band 48, transportation and mounting are facilitated.

  FIG. 9 is a view showing an example of a side pin in which the form of the elastic body is further changed. The side pin 20D is provided with a key plate groove 22 at the tail and a small diameter portion 23 at the tip. A pin main body 25 provided with a screw portion 24, a spherical elastic body 27D fitted to the pin main body 25, a cup-shaped cover member 28D for housing the elastic body 27D, and the cover member 28D And a retaining member 32 </ b> D for restraining it from slipping out of 25.

  In order to stably store the spherical elastic body 27D, a necessary number of spherical concave portions 49 are provided in the cover member 28D. Preferably, the required number of spherical concave portions 51 are also provided in the small diameter portion 23 of the pin body.

Since the configuration and operation of the retaining member 32D are the same as those of the retaining member 32B of FIG. 6, detailed description thereof is omitted.
In the embodiment, the spherical elastic bodies 27 are arranged in three rows, but the number of rows may be two or four or more.

  The shape of the cover member is not limited to the embodiment. Further, the structure of the present invention may be applied to a normal press.

  The present invention is suitable for a high-speed press.

It is principal part sectional drawing of the press apparatus which concerns on this invention. It is an exploded view of the principal part of a press apparatus. FIG. 3 is an assembly diagram of FIG. 2. It is a graph which shows the result of a comparative test. It is the graph which investigated the relationship between the thickness of urethane and impact force. It is a figure which shows the example of the side pin which changed the form of the cover member. It is a figure which shows the example of the side pin which changed the form of the elastic body. FIG. 8 is a cross-sectional view taken along line 8-8 in FIG. 7. It is a figure which shows the example of the side pin which changed the form of the elastic body further. It is sectional drawing which shows the principal part of the conventional press apparatus.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Press apparatus, 11 ... Upper mold | type, 20, 20B, 20C, 20D ... Side pin, 21 ... Tip part, 25 ... Pin main body, 27, 27C, 27D ... Elastic body, 28 ... Cover member, 32, 32B, 32C , 32D ... retaining member, 34 ... cylindrical portion, 35 ... front lowering portion, 36 ... rear lowering portion, 46, 47 ... arc groove, 49, 51 ... spherical concave portion, C ... gap, d1 ... outer diameter of tip portion , D1... Inner diameter of the recess.

Claims (6)

A side pin is provided horizontally on the upper die that moves up and down, a pad is attached to the side pin, a recess having a diameter larger than the outer diameter of the tip of the side pin is provided in the pad, and the tip of the side pin is provided in the recess. In the press device that is configured to hold the pad so as to be movable up and down by the side pin by inserting,
The tip of the side pin has an elastic body disposed on the outer periphery of the pin body, a cover member that covers the elastic body and defines the outer diameter of the tip of the side pin, and prevents the cover member from coming off. And a retaining member attached to the pin body.   The cover member includes a cylindrical portion extending parallel to the axis of the pin main body, and a front lower portion and a rear lower portion extending from the front and rear of the cylindrical portion to the position away from the pin main body so as to sandwich the elastic body. The press device according to claim 1, wherein the press device has a U-shaped cross section.   The press device according to claim 2, wherein a gap is provided between the front lowering portion and the elastic body and between the rear lowering portion and the elastic body.   The press device according to claim 1, wherein the elastic body has a ring shape that fits on an outer periphery of the pin body, and the cover member has a cup shape.   2. The press according to claim 1, wherein the elastic body has a roller shape extending in the axial direction of the pin body, and the cover member has a cup shape and an arc groove that houses the elastic body. apparatus.   2. The press apparatus according to claim 1, wherein the elastic body has a spherical shape, and the cover member has a cup shape and a spherical concave portion that houses the elastic body.

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