JPH08309456A - Press die - Google Patents

Abstract

PURPOSE: To provide a press die which is capable of reducing working manhour and assembling manhour and which is provided with a simple guide structure and an easy-to-repair sliding face structure. CONSTITUTION: In a press die 11 in which a guide post 16b is guided by a guide bush 16h so as to make it slide and relatively move each main body of a lower die 12 and an upper die 13 for press forming, the guide post 16b is made of a prism with a fixed block 16a also installed for sticking the guide post 16b on one main body of either the lower die 12 or the upper die 13. Then, the guide bush 16h for receiving the prismatic guide post 16b is provided freely detachably from the other main body.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a press die, and more particularly to an improvement of a guide portion of a press upper and lower dies.

[0002]

2. Description of the Related Art Conventional press dies for steel plate processing are
A round guide post is often used as a guide part with good positional accuracy. However, when using a round guide post with a cam type shear type that receives a strong thrust force,
It is rare to hit the entire surface of the guide post uniformly, and it is normal to receive a strong thrust force as a line contact. Therefore, the wear is so severe that the displacement even affects the cutting edge, and failures such as breakage of the cutting edge often occur.

Therefore, as shown in FIGS. 3 and 4, a press die 1 having a guide portion 6 integrally combined with a round guide post 6a is added by adding a heel type guide 6b which receives a thrust force on its surface. It has come to be used.

That is, FIG. 3 is a sectional view showing a cam type shearing die as an example of a die for receiving a thrust force. The construction will be described with reference to FIGS. 3 and 4.

The press die 1 is manufactured by machining a material integrally cast. This press die 1 comprises an upper die 3 and a lower die 2,
A punch 2a and a pressing block 3d as a holding mechanism 4 for the molding plate 7 are provided at the center of the mold, and a cam 5a mounted on the upper mold 3 as a shearing mechanism 5 and a lower block 2 are mounted on the lower mold 2. It is composed of a cam slide 5b. Then, a guide portion 6 in which a round guide post 6a and a heel type guide 6b are combined is configured at the end of the die outside the shearing mechanism 5. In this embodiment, as shown in FIG. 4, the guide portion 6 has a mold structure in which four guides are provided at four corners of the mold.

Next, the operation of the press die 1 is as follows. When the upper die 3 mounted on the slide of a press machine (not shown) is lowered toward the lower die 2, first, the pressing block 3d is installed on the punch 2a. The formed plate 7 is fixed by pressing. When the pressing is continued, the spring 3e of the presser block 3d contracts and can descend. Therefore, the cam 5a abuts the cam slide 5b, and the cam slide 5b is provided on the cam slide 5b while advancing to the punch 2a side. The end material portion 7a of the forming plate 7 is sheared and cut between the cutting blade 5c and the eaves portion 2b of the punch 2a.

When the shear cutting of the forming plate 7 is completed, the upper die 3
Moves up as the slide of the press machine moves up, and is returned to its original position by the return mechanism in which the cam slide 5b is also incorporated, completing one machining cycle operation. By repeating this press working operation, press parts were produced.

[0008]

However, since the guide portion 6 in which the round guide post 6a and the heel type guide portion 6b are combined is an integrally cast material, it is necessary to perform multifaceted processing. In addition to the need to move the entire casting material for the machining of the above, since it is a large product, it is difficult to obtain machining accuracy, and a great number of machining man-hours are required.

Further, the fitting of the round guide post 6a into the machined boss portion 2c, the attachment of the wear plate 8 to the outer peripheral surface portion 3c, and the like are all performed in parallel with the movable direction. Therefore, there has been a problem that the number of working steps and assembling steps for the press die 1 is required, and the manufacturing cost is increased.

When repairing a die such as a sliding surface,
A great deal of work such as disassembling the entire press die 1 and exchanging parts such as the round guide post 6a and wear plate 8 and cutting, assembling the press die 1 and adjusting the contact of each sliding surface. It required man-hours.

Therefore, the present invention provides a press die having a guide portion having a simple guide portion structure and a sliding surface structure which can be easily repaired, while reducing the number of working steps and assembling steps. The purpose is to do.

[0012]

In order to achieve the above object, the invention described in claim 1 is such that a guide post is slid on a guide bush so that a lower mold body and an upper mold body are relatively moved. In a press die for moving and press-forming, the guide post is a prism, and a fixing block for fixing the guide post is provided on one of the lower mold body or the upper mold body and receives the prism. It is characterized in that the guide bush is detachably provided on the other side.

According to a second aspect of the present invention, in the press die according to the first aspect, the fixing block is composed of two parts, and each of the fixing blocks sandwiches and supports two adjacent surfaces of the prism. It is characterized in that it has a supporting surface and also has screw means for applying a pressing fixing force to the ridge line portion formed by the two adjacent surfaces of the prism. According to a third aspect of the present invention, in the press die according to the first aspect, the guide bush is composed of two parts, each of which has a guide support surface for guiding and supporting two adjacent surfaces of the prism. It is characterized by

[0014]

According to the invention of claim 1, the guide post is a prism, and a fixing block for fixing the guide post is provided on one of the lower die body and the upper die body, and the guide bush for receiving the prism is provided on the other. By being provided detachably, the thrust force can be received as the surface pressure of the prism. Therefore, the load per unit area is small and the amount of wear is small.

Further, since the fixed block and the guide bush provided on the lower die and the upper die are detachable, they can be machined and repaired as a single unit and can be machined with good workability and accuracy. The number of steps can be reduced.

According to the second aspect of the present invention, the fixed block is composed of two parts, each having a sandwiching support surface for sandwiching and supporting two adjacent surfaces of the prism, and the two adjacent surfaces of the prism. By having screw means for applying pressure fixing force to the formed ridge line, it is only necessary for the two parts to be used in correspondence with each other, and the parts can be machined separately, resulting in good workability and high accuracy. Easy to put out. Further, unlike the conventional fitting and assembling, the screw means receives the force applied in the direction of the ridgeline by adjustment, and also applies the uniform force to the two adjacent sandwiching support surfaces.

According to the invention of claim 3, the guide bush is composed of two parts, each of which has a guide support surface for guiding and supporting two adjacent surfaces of the prism.
The two parts can be the same product, and because they can be machined separately, they are easy to work with high accuracy. Also, by using two sets as a set, the same guide bush can be used, and the number of parts can be reduced.

[0018]

Embodiments of the present invention will be described below with reference to the drawings.

1 (a) and 1 (b) are sectional views showing an embodiment of the present invention.

First, the structure will be described.
Shows a cam type shearing die which is a press die, and is constituted by a lower die body 12 attached to a bolster of a press molding machine (not shown) and an upper die body 13 attached to a slide. This cam type shearing type substantially central portion 14
The cam type shearing mechanism 15 is provided in the
Guide portions 16 are provided on both sides of.

The lower mold body 12 of the cam type shear mold 11 is
A die plate 12a serving as a base is provided, a punch 12b is attached to a substantially central portion 14 of the die plate 12a, a nest pin 12e is provided on the punch 12b, and a molding plate 17 is fixed to the nest pin 12e. A cutting edge 12d is provided on a peripheral portion 12c of the punch 12b. A slide block 15b is provided at a position facing the cutting blade 12d, and the cutting blade 1 is attached to the slide block 15b.
2d and a plate end pressing portion 15c are provided. Then, the scale 15d is attached to the die plate 12a on the outside of the slide block 15b, and the sliding portion 15e of the cam 15a is attached.
Is formed.

A cam type shearing mechanism 15 is constructed by combining the above-mentioned upper and lower molds.

Further, the guide portions 16 provided on both outer sides of the shearing mechanism 15 have the guide posts 16b as prisms, and a fixed block for fixing the guide posts 16b to one of the lower mold body 12 and the upper mold body 13. 16a and the guide bush 1 which slides the guide post 16b on the other side
6h is provided, and the guide post 16b is fixed to the fixed block 16a by adjusting the screw means 16g so as to be parallel to the sliding direction of the press machine. FIG. 1B shows a state in which the two fixed blocks 16a form a set and sandwich the guide posts 16b from opposite directions.

That is, the fixed block 16a comprises a holding portion 16c and a flange portion 16d.
6d is provided with a locating pin 16e and a fixing bolt 16f so as to be attached to the upper and lower die plates 12a, and the holding portion 16c has a prismatic guide post 16b.
A sandwiching support surface for sandwiching and supporting two adjacent surfaces of is formed,
An escape groove (not shown) that escapes the corner of the guide post 16b is formed at the center position of the two surfaces. At the clearance groove position, the screw means 16g adjusts the tilt of the guide post 16b that is abutted against the ridge of the opposing guide post 16b, the even contact between the guide post 16b and the sandwiching support surface of the fixed block 16a, and pressing. It gives a fixed force.

In addition, the guide bush 1 is used for other types.
6h is removable. This guide bush 16
The h is composed of two parts and has a guide support surface for guiding and supporting two adjacent surfaces of the prism, and is substantially the same as the fixed block 16a, but is different in that the height and the screw means 16g are not provided. An escape groove is formed in the Sakai of the guide support surface forming a right angle. The prismatic guide posts 16b are slidably fitted to guide bushes 16h that form a square hole in pairs so as to sandwich them. And the flange portion 16d
The die plate 13a of one of the molds 13 is fixed to the mold.

The guide post 16b has an oil groove 16k.
Is provided to improve the wear resistance of the sliding surface with the guide bush 16h.

Next, the guide portion 16 of this press die 11
The assembling and repair assembling operations will be described.

When the guide portion 16 provided on the die receives the thrust force applied to the press die, and when the sliding surface of the guide portion is abraded, the upper and lower die plates 12a and 13a respectively fix the fixed block 16a and Remove the guide bush 16h. That is, first, the locate pin 16e of the flange portion 16d is pulled out, then the fixing bolt 16f is removed, and the upper and lower molds are disassembled. At this time, the guide posts 16b can be taken out by removing the fixed blocks 16a and the guide bushes 16h in pairs.

Then, each sliding surface may be inspected, and the surface may be cut and polished as needed according to the angle of the guide post. That is, it is only necessary to perform the drive-in work on the sliding surface which is a single component.

Then, when the surface processing is completed, the assembling into the mold is started. First, the fixed block 16a and the locate pin 16e of the guide bush 16h are reamed so that the fixed block 16a is attached to one mold. From the die plate 12a, (13a), then the fixing bolt 1
Assemble on 6f. Then, the guide bush 16h is similarly assembled to the other mold in the order of the locate pin 16e and the fixing bolt 16f to complete the repair assembly of the guide portion 16. .

In the present invention, the difference in function due to the guide post being changed from the conventional round shape to the prism shape is that, as shown in FIG. 2, a round guide post: τmax (1) = 4/3 · F / πr ² = 1.333F / A ・ ・ ・ ・ ・ Prism guide post: τmax (2) ＝ 9 / 8√2 ・ F / a ² ＝ 1.591F / A ……, and when the same shear load is applied, and The drag ratio to the maximum shearing force of the other side is / = 1.19, and about 20% of the prismatic cross section has stronger shear resistance than the round cross section.

Further, the maximum value in the shear stress distribution comes to one place in the central portion in the round cross section, but it is received by two faces in the prism, which makes it resistant to shear. Moreover, FIG. 2 shows that the shear stress distribution area is large and the shear drag is large.

Therefore, it is apparent from the above-mentioned results that the thrust guide force cannot be received by the round guide post 6a alone and the thrust guide force must be used together with the heel type guide 6b. Further, in the present invention, if the cross-sectional area is commensurate with the pressing force only by the simple structure of the prismatic guide post 16b, the round guide post 6a can be guided with high precision and the heel-type guide 6b having the surface load structure. It can be seen that the advantages can be gathered in the guide portion 16 of the prismatic guide post 16b. That is, it can be said that the guide portion 6 in which the round guide post and the heel-type guide are combined can be sufficiently comparable.

Further, it is needless to say that the prism having stress distribution such as the guide portion 16 of the present invention is less worn and less repaired.

Further, since the fixed block 16a and the guide bush 16h provided on the lower mold 12 and the upper mold 13 are detachable, parts can be manufactured and processed independently, and workability and accuracy are easy to obtain. Also, the workability becomes good, and the man-hours for processing and the man-hours for assembling can be reduced.

Further, unlike the conventional fitting and assembling, the fixing screw 16g can be disassembled and the precision of the guide post 16b can be adjusted. Therefore, the processing man-hours and the assembly man-hours can be reduced.

[0037]

As described above, according to the first aspect of the present invention, the guide post is a prism, and a fixing block for fixing the guide post is provided on one of the lower mold body and the upper mold body. Since the guide bush for receiving the prism is detachably provided on the other side, the thrust force can be received as the surface pressure of the prism. Therefore, the load per unit area is small and the amount of wear is small.

Further, since the fixed block and the guide bush provided on the lower mold and the upper mold are detachable, parts can be machined as a single unit, and the workability and the accuracy can be easily improved. Can be achieved.

According to the second aspect of the present invention, the fixing block is composed of two parts, each having a sandwiching support surface for sandwiching and supporting two adjacent surfaces of the prism, and the two adjacent surfaces of the prism. By having the screw means for applying the pressing fixing force to the formed ridge portion, the two parts can be the same product, and the types of the parts can be reduced. In addition, parts can be processed by itself, workability is good and accuracy is easy to obtain. Further, unlike the conventional fitting and assembling, the assembling by the fixing screw and the precision adjustment of the guide post can be performed. Therefore, the processing man-hours and the assembly man-hours can be reduced.

According to the invention of claim 3, the guide bush is composed of two parts, and each has a guide support surface for guiding and supporting two adjacent surfaces of the prism.
The two parts are the same, and the types of parts can be reduced. or,
Since it can be machined as a single unit, it has good workability and accuracy.

[Brief description of drawings]

FIG. 1A is a sectional view of a main part of a press die showing an embodiment of the present invention, and FIG. 1B is a sectional view of a guide portion taken along the line AA of FIG.

FIG. 2 is a shear stress distribution diagram of a cross section of a prismatic guide post of the present invention and a conventional round guide post.

FIG. 3A is a cross-sectional view of a main part of a press die showing a conventional example, and FIG. 3B is a cross-sectional view of a guide portion taken along the line BB of FIG.

FIG. 4 is a plan layout view of a guide portion of a press die showing a conventional example.

[Explanation of symbols]

 11 ... Press mold 12 ... Lower mold 13 ... Upper mold 16 ... Guide part 16a ... Fixed block 16b ... Guide post 16h ... Guide bush

Claims (3)

[Claims] 1. A press die in which a guide post is guided and slid by a guide bush to relatively move a lower die body and an upper die body to perform press forming, wherein the guide post is a prism and the lower die is provided. A press die, wherein a fixing block for fixing the guide post is provided on one of a die body and the upper die body, and the guide bush for receiving the prism is detachably provided on the other. 2. The fixed block comprises two parts,
Each of them has a sandwiching support surface for sandwiching and supporting two adjacent surfaces of the prism, and also has a screw means for applying a pressing fixing force to a ridge line portion formed by the two adjacent surfaces of the prism. The press die according to claim 1, wherein: 3. The press die according to claim 1, wherein the guide bush is composed of two parts, each of which has a guide support surface for guiding and supporting two adjacent surfaces of the prism. .