JPS6317535Y2 - - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a laminated die set.

When forming metal materials such as punching, bending, drawing, or casting in a high-mix, low-volume production system, reducing the cost of the molds used for these processes and shortening delivery times become major issues. It is clear that manufacturing punches and dies for such molds (cutting dies, bending dies, drawing dies, etc.) is costly and time consuming, but the processing of die sets also often takes up a large part of the mold manufacturing process. Are known.

A die set is a means to ensure precision of movement between a punch and a die, and consists of an upper and lower holder, a guide post, and a guide bush, and is an essential part of the die structure of cutting dies and the like. This die set especially the upper and lower holders.
are usually made by rough and finishing hollowing and drilling on a thick plate of molten lumber.

However, since the die set requires strength to withstand the load during molding, it has a fairly large wall thickness, and therefore the press-fit holes for the guide posts and guide bushes are deep, and in the case of a punch-out type, the punch hole is also deep. For this reason, in the past, manufacturing a die set required an extremely long processing time, which inevitably increased the mold cost.

The present invention was devised after repeated research in view of the above-mentioned circumstances.The purpose of this invention is to have a simple structure, good accuracy, and other characteristics, be easy to manufacture, and significantly reduce mold costs. Our objective is to provide a die set that can be reduced in size and delivered quickly.

In order to achieve this objective, the present invention has developed a fully laminated structure model using metal plates with the necessary holes cut by laser cutting or punching, and one screw member is welded to the back side of the metal plate, which will become the mold surface layer during lamination. A hole for receiving a screw member is formed in the metal plate of the next layer and below along with a dropout hole, a guide post hole, and a guide bushing hole, and the metal plate of the next layer and below is overlapped with the surface metal plate and inserted into the hole. While tightening the other threaded member on the front and back side, a guide post having a flange and a thread in the middle is fitted into the guide post hole, and the guide post is integrated by screwing the nut and the male thread. A guide bushing having a flange at the lower end and a thread at the upper end is fitted into the guide bushing hole, and a nut is screwed onto the male thread to integrate the guide bushing and secure the surrounding area of the laminate. This is to obtain a fixed value.

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

Figures 1 to 3 show an example of a laminated die set according to the present invention and a cutting die of a full laminated structure using the same, where 1 is the die set, 2 is the die (lower die),
3 is a punch (upper mold), and 4 is a movable stripper.
FIG. 4 shows an embodiment in which the present invention is applied to a drawing die.

The die set 1 consists of a lower die set body 5, an upper die set body 6, a guide post 7, and a guide bush 8. However, in the present invention, both of the lower die set body 5 and the upper die set body 6, or in some cases, either one is constructed by laminating a large number of metal plates 9, 9' and tightening this laminated body with special guide posts 7 and guide bushes 8.

First, each metal plate 9, 9' is made of a flat plate made of low, medium, or high carbon steel with a required thickness of 3 to 10 mm, for example, and has a guide post hole 10, a guide bush hole 11, and a shank mounting hole 12. Necessary holes such as a hole 13 for attaching a punch holder, and a cut-out hole 14 are formed through the thickness of the plate.

The holes are formed using NC tape 1 from the master model or die set design drawing 15, as shown in Figure 5.
5' is prepared, and using this NC tape 15', processing is carried out with a processing machine 16 such as a laser cutting machine or an NC turret punch press. When a laser cutting method is adopted, it has the advantage that it can be performed regardless of the hardness of the metal plate, there is a high degree of freedom in the cutting shape, and the cut surface is smooth. Further, since the cutting width is narrow, a punch laminated member, a die laminated member, or a peripheral laminated member can be obtained simultaneously by processing a single hard plate.

The metal plate 9 for the lower die set body 5 is
It consists of an upper plate 9a having a hole 101 corresponding to the neck 72 of the guide post 7, and a lower plate 9b having a large diameter hole 102 larger than the hole 101. In the illustrated case, the plate 9' has a hole with a constant diameter corresponding to the outer diameter of the guide bush, and the upper plate 9a' has an enlarged hole 130 for attaching a punch holder.

The metal plates 9 and 9' are laminated to a required thickness so that the cores of the holes formed in the metal plates coincide with each other, and this lamination results in the guide post holes 1 accumulated in the shape of deep holes.
0, the guide bush hole 11, the dropout hole 14, and other holes described above are obtained.

This guide post hole 10 and guide bush hole 1
In the present invention, the guide post 7 has a flange 71 at the bottom, and a thread 75 is formed between the neck portion 72 and the shaft portion 74. Therefore, by fitting the flange 71 into the large-diameter hole 102 of the lower plate 9b, placing the nut 17 on the male screw 75 protruding from the upper plate 9a, and rotating this, the thickness of the laminate is reduced between the lower surface of the nut and the upper surface of the flange. The lower die set body 5 is firmly tightened in the transverse direction and is integrated with the guide post 7.

On the other hand, the guide bush 8 has a flange 81 at the lower end.
and has a male thread 82 on the outer periphery of the upper end, and the laminate is tightened by screwing the nut 18 into the male thread 82 protruding from the upper plate 9a'.
The upper die set body 6 is integrated with the guide bush 8. Note that bolts 19 and 20 are also inserted into the shank attachment hole 12, punch holder attachment hole 13, etc., respectively, and are integrated with the upper die set body 6 by tightening them with nuts.

When stacking the metal plates 9 and 9' as described above,
The metal plate itself has slight warpage, and warpage is also formed by drilling holes. Therefore, the third
If the metal plates A are stacked with their warpage directions in the same direction as shown in FIG. Therefore, in the present invention, as shown in Fig. 3b, each set of the required number of metal plates A and B having the same warp direction is assembled so that the warp directions are opposite to each other. . As a result, guide post 7
In addition to improving the perpendicularity, a kind of disk spring effect occurs to prevent loosening of the screws 75, 82 and nuts 17, 18, and exhibits characteristics that can sufficiently withstand repetitive loads such as punching. .

In this embodiment, the die and punch are each constructed by laminating hard thin plates 19 such as bainite steel plates that are laser cut or punched. These laminated dies 2 and laminated punches 3 are the lower die set body 5 and the upper die set body 6 described above.
be fixed in any way. Strictly speaking, the second layer of the laminated die 2 and the second and lower layers of the laminated punch 3 are packing plates, but in this invention they are collectively referred to as the laminated die and laminated punch. .

Note that the metal plates 9 and 9' are fixed by tightening with the guide post 7 and guide bush 8 as before, but in order to increase the laminated strength, each of the laminated plates 9 and 9' is further tightened with screws as shown below. It is fixed. That is, as shown in FIG. 2, a through hole 21 is formed in the metal plate constituting the laminated die 2 or the die set body by laser cutting or punching, and one screw member 22 is welded to the lower surface of the surface plate corresponding to the through hole 21. After lamination, the other screw member 23 may be inserted into the through hole 21 and screwed together. In other drawings, 24 is a retainer, 25 is a spring, 26 is a shell, and 27 is a punch holder.

Since the present invention has the above-mentioned configuration, the die set 2 is fixed to the lower die set body 5, and the punch 3 and movable stripper 4 are fixed to the upper die set body 6 via the punch holder 26, thereby forming the desired mold (in the drawings). The lower die set body 5 is placed on a pole star, etc., the upper die set body 6 is connected to the shaft 25, and the workpiece is charged in the usual manner and the upper die set body 6 is raised and lowered to perform processing. will be held.

In this case, the lower die set body 5 and the upper die set body 6, which are the main elements of the die set, are connected to the metal plate 9,
Since it has a 9' laminated structure, its rigidity is lower than that of a conventional die set which is made by hollowing out a solid shape. However, since the lamination of the metal plates 9 and 9' has a certain degree of springiness, and a moderate cushioning effect is exerted over the whole, good tool properties can be obtained even if the actual rigidity is low, and it is possible to perform processing such as punching. There is no difference in accuracy. Note that mold rigidity can be easily increased by increasing the plate thickness or increasing the number of laminated sheets.

According to experiments by the present inventors, 4.5
Using mm-thick S55C material, holes were cut using laser cutting, and 10 sheets were stacked to form the lower die set body.
8 sheets are stacked to form the upper die set body, and as shown in Fig. 2, they are tightened and fixed with guide posts and guide bushes, and one 2.0 mm thick bainite steel plate is used for the die and punch cutting edge, and the metal plate is used as a back-up. A cutting die was made by stacking one sheet on the die and four sheets on the punch, and punched out SPC material (1.0 mmt), pure copper plate material (1.0 mmt), and pure aluminum plate material (2.0 mmt) as work materials. The punched shape was a butterfly shape as shown in FIG. As a result, a uniform good product with almost no error from the design value and a burr height of within 0.04 mm was obtained, and almost no deviation occurred even after punching 10,000 times.

In addition, in the case of the present invention, since the guide post 7 and guide bush 8 are removable, the dimensions of the guide post hole 10 and guide bush hole 11 can be unified for each type of laminated die set, so that they can be used freely. Since it is made up of laminated metal plates 9 and 9', it is possible to freely respond to variations in forming load by increasing or decreasing the number of laminated metal plates.

In addition, manufacturing time is extremely short, as metal plates with holes cut using an NC laser cutting machine or a turret punch press are layered to create a die set of the required thickness. For example, in the case of the previous prototype, the die set was approximately
It took 100 minutes to complete, and the entire mold took about 2 hours and 20 minutes.

According to the present invention described above, in a mold in which metal plates with necessary holes cut by laser cutting or punching are laminated, one screw member 22 is welded and fixed to the back side of the metal plates that will become the surface layer during lamination, and then A through hole 21 for receiving a screw member is formed in the metal plate in the next layer and the cutout hole, the guide post hole 10, and the guide bush hole 11.
The stacked state is fixed by screwing and tightening the other screw member 23 inserted into the screw member 22 on the back side of the surface layer, while the flange 71 is inserted into the guide post hole 10.
The guide post 7 is fitted with a thread 75 in the middle, and the nut 17 and the male thread 15 are screwed together to integrate the guide post and fix the periphery of the laminate. The guide bush 8 having a screw 82 at the upper end is fitted, and the nut 18 is screwed onto the male thread 82 to integrate the guide bush and fix the periphery of the laminate. While taking advantage of the advantages, it is possible to solve manufacturing and usage problems such as mold strength and accuracy.

In other words, since the present invention is a fully laminated type including the shoe, there is no need to process thick parts at all, and there is no need to perform processes such as smoothing or polishing on the metal plate, which simplifies mold production. After fixing the laminated state by screwing and tightening the other screw member 23 inserted into the through hole 21 in the middle part with one screw member 22 on the back side of the surface layer, the guide post and guide bushing can be attached to the peripheral part. Since it is firmly fixed, it can be made into a sufficiently strong fixed laminated structure, and even if the plate thickness is thin, it can sufficiently withstand large loads and repeated loads many times.

At the same time, due to the above fixing method, the guide post has good straightness despite the laminated structure, and there is no misalignment between the plate surfaces due to unbalanced lateral forces, so good movement accuracy can be obtained. In addition, not only does the laminated fixing member not appear on the surface of the mold at all, but there is also no hole for inserting the fixing member, so there is no possibility that the screw head will protrude from the insertion hole over time and interfere with the feed of the workpiece. Furthermore, there is no problem of the insertion hole being transferred as an impression on the product, and therefore the processing accuracy can be improved.

Furthermore, when disassembling the mold to replace the cutting blade or change the stacking height, there is no problem of the insertion hole being clogged with chips and the fixing member cannot be removed. 17,18
This work is also extremely easy as it can be easily attached and detached from the laminate by loosening it.

This makes it possible to reduce costs and shorten delivery times for various cutting dies including progressive dies for high-mix, low-volume production, bending dies, drawing dies, casting dies, injection molding dies, and assembly jigs such as sub-presses. Excellent results can be obtained.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing an embodiment of the laminated die set according to the present invention and a cutting die to which the same is applied, with the top and bottom separated, Fig. 2 is a cross-sectional view thereof, and Fig. 3 shows the lamination method of metal plates. In the figure, a indicates an unfavorable case, and b indicates a preferable case. FIG. 4 is a partial sectional view showing an embodiment in which the present invention is applied to a drawing die, and FIG. 5 is an explanatory view showing the manufacturing process of the laminated die of the present invention. 1...Die set, 5...Lower die set body,
6... Upper die set body, 7... Guide post,
8...Guide bush, 9,9'...Hard plate, 1
0... Guide post hole, 11... Guide bush hole, 17... Nut, 18... Nut, 71...
Flange, 75...male thread, 81...flange,
82...Male thread.

Claims (1)

[Scope of utility model registration request] In the fully laminated structure type, which is made of metal plates with the necessary holes processed by laser cutting or punching, one screw member is welded and fixed to the back side of the metal plate, which will become the surface layer of the mold surface during lamination, and then attached to the metal plates of the next and subsequent layers. Forms a through hole together with the cut-out hole, guide post hole, and guide bushing hole, overlaps the metal plate of the next layer and below with the surface metal plate, and screws the other screw member inserted into the through hole with the screw member on the back side of the surface layer. While tightening, a guide post having a flange and a thread in the middle is fitted into the guide post hole, and the nut and male thread are screwed together to integrate the guide post and fix the periphery of the laminate. A laminated die set characterized in that a guide bush having a flange at the lower end and a thread at the upper end is fitted, and a nut is screwed onto the male thread to integrate the guide bush and fix the peripheral part of the laminate. .