CN1069238C - Press die and method of making same - Google Patents

Abstract

The present invention relates to a press mold and a method of manufacturing the press mold, wherein the manufacturing man-hours are greatly reduced and the precision of the mold pressing surface is greatly improved. A plurality of pieces of resin are laminated to form a pair of first and second resin compacts. Machining is performed on one side of each lamination direction of the first and second resin compacts to form a flat reference plane. The other faces of the first and second resin compacts are machined using a numerically controlled machining machine to form a pair of opposing molding faces.

Description

Die and manufacturing method thereof

The invention relates to a compression mold and its manufacturing method.

The configuration of a conventional stamper used to stamp parts such as automobile parts on an experimental basis is shown in Figure 8. The lower mold 100 of the conventional die includes a square column iron frame 101, a bottom resin 102 covering the lower end of the iron frame 101, a reinforcing tube 103 placed in the iron frame 101, filling the inside of the iron frame and solidified with the resin sand 104, and the surface resin 105 covering the upper end of the iron frame 101. The outer surface of the surface resin 105 functions as a die surface 107 . The upper die 106 has a die surface 108 facing the die face 107 formed in the same manner as the lower die 100 .

In order to manufacture the above-mentioned conventional die, at first will do a master mold for lower mold 100 and do a master mold for upper mold 106, then do a plaster mold for lower mold 100 and for upper mold 106 on the basis of master mold Make a plaster mold, then make lower mold 100 and upper mold 106 on the basis of plaster mold.

Conventional stamping molds in the past have to manufacture master molds and plaster molds and have complex structures, which cost a lot of man-hours. A great deal of material is wasted as a by-product of making the master and plaster casts. Moreover, these by-products are difficult to discard. In addition, it is difficult to throw away the stampers after use because these stampers are not easily cut into small pieces.

It is therefore an object of the present invention to provide a stamper and a method of manufacturing such a stamper which are easy to manufacture and easy to discard.

According to an aspect of the present invention, a method of manufacturing a stamper is characterized in that it includes the steps of: forming a pair of first and second resin compacts by laminating a plurality of pieces of resin; One face of each blank forms a flat reference face; and a pair of opposing molding faces are formed by machining the other faces of each of the first and second resin blocks using a numerically controlled machining machine.

According to another aspect of the present invention, a method of manufacturing a stamper is characterized in that it includes the steps of: forming a pair of first and second resin compacts by laminating a plurality of resin plates; One surface of each of the two resin compacts forms a flat reference surface; a pair of opposing molding surfaces are formed by machining the other surfaces of the first and second resin compacts by using a CNC machining machine; and polishing the first and second resin compacts molded surface.

According to still another aspect of the present invention, a stamper is characterized in that the first and second resin blocks composed of first and second resin sheets composed of a plurality of laminated resin sheets are arranged in their respective directions of lamination. A flat reference plane is formed on one face, and a pair of opposing molded faces are formed on the respective other faces of the above-mentioned first and second resin compacts.

According to still another aspect of the present invention, a stamper is characterized in that the first and second resin blocks composed of a plurality of laminated resin plates are formed with a flat datum on one face of their respective lamination directions. On the other side of each of the above-mentioned first and second resin compacts, a pair of opposing molding surfaces processed by a numerically controlled machining machine are formed.

The present invention will be described in detail with reference to the accompanying drawings. In the attached picture:

Fig. 1 is the front sectional view of a preferred embodiment of die of the present invention;

Fig. 2 is a perspective view showing cutting a board;

3 is a perspective view of a first resin compact and a second resin compact;

Fig. 4 is a front view showing a datum surface processed;

Figure 5A is a front view showing a molded surface;

Figure 5B is a front view showing that another molding surface has been processed;

Figure 6A is a front view showing polishing of a molding surface;

Figure 6B is a front view showing polishing the other molding surface;

Fig. 7 is the lower sectional view that shows stamper to be in mating state; And

Fig. 8 is a front sectional view showing a conventional stamper.

Preferred embodiments of the present invention will now be described with reference to the accompanying drawings.

Fig. 1 shows a preferred embodiment of the stamper of the present invention. This stamper is a temporary stamper used to press parts such as automobile parts on an experimental basis. When manufacturing this stamper, first process a flat datum plane on one side of the lamination direction of a pair of first and second resin bad blocks B ₁ and B ₂ laminated with multi-layer resin board 1 2. Then, on the other side of the first and second resin blocks B ₁ , B _{2 ,} process a pair of mold face pressures P ₁ , P ₂ with a CNC cutting machine.

The resin plates 1 forming the first and second resin compacts B ₁ , B ₂ are adhered to each other with an adhesive. The molded faces _P1 , _P2 have irregular configurations corresponding to the irregular inner and outer surfaces of the part, respectively.

The molding surface is formed on the other side of the first and second resin compacts B ₁ , B ₂ in the lamination direction of the resin sheets 1 constituting the first and second resin compacts B ₁ , B ₂ , and thus, when molding one In the case of a plate (for example, a steel plate), the pressure of the molding is applied in a direction perpendicular to the bonding surface of the resin plate 1. Thus, the multilayer boards 1 will remain bonded to each other. The molded surfaces P ₁ and P ₂ are processed by CNC cutting machine tools, and the precision of the molded surfaces is higher than that of injection molded surfaces. Also, the structure of the stamper is simple and easy to manufacture. The entire first and second resin blocks B ₁ , B ₂ are made of resin, so the design of the die can be changed only by processing the molding faces P ₁ , P ₂ . After the die is used up, the molding surfaces P ₁ and P ₂ can be cut flat, and then new molding surfaces P ₁ and P ₂ can be processed. Therefore, the first and second resin compacts B ₁ , B ₂ can be reused. The first and second resin compacts B ₁ , B ₂ can be easily cut into small pieces, and these small pieces of waste can be easily disposed of.

A method of manufacturing such a stamper will be described below. First, as shown in FIG. 2 , the resin plate 3 is cut to a predetermined size with a cutter 4 . In the same way, many resin boards 1 are cut out. The material of the plate 1 is ABS resin, wherein inorganic additives and other additives are added. This can improve the wear resistance and compressive strength of the stamper.

As shown in FIG. 3, a plurality of resin plates are laminated into a pair of first and second resin compacts B ₁ , B ₂ . That is, a plurality of boards 1 are bonded to each other with an adhesive. Therefore, no resin injection molding is required, the first and second resin compacts _B1 , _B2 can be manufactured easily, and the manufacturing cost of the press mold can be reduced.

As shown in Figure 4, one surface of the first (second) resin block B ₁ (B ₂ ) in the lamination direction is processed with a cutter 7 to form a flat reference plane 2 (hereinafter referred to as the reference plane) processing procedure). The reference surface 2 is used as a reference surface in subsequent processing steps, and as a mounting base surface when the first (second) resin compact B ₁ (B ₂ ) is mounted on a press (not shown).

In the next step, as shown in Fig. 5A and Fig. 5B, the other side of the first and second resin blocks _B1 , _B2 (ie the side opposite to the reference plane 2) is machined with a tool 5 on the CNC machining machine. For the molding surface P ₁ , P ₂ (hereinafter referred to as cutting process).

That is to say, first, as shown in Figure 5A, input the relevant data of the lower mold into the CNC machine tool, and use the tool 5 of the CNC machine tool to process the other side of the first resin block _B1 in the lamination direction to form the molding surface of the lower mold _P1 . Then input the upper mold data opposite to the lower mold data into the CNC machine tool, as shown in Figure 5B, use its cutting tool 5 to process the other side of the second resin block B ₂ in the lamination direction to form the molding surface P ₂ of the upper mold .

The molded surfaces P ₁ , P ₂ are thus machined using a numerically controlled machine tool, and the precision of the molded surfaces is much higher than that formed by injection molding. Numerical control machine tools used for wood processing can be used to process such dies, so equipment costs can be reduced.

Contrary to the above sequence, it is also possible to first input the data of the upper mold into the CNC machine tool, first process the molding surface P ₂ of the upper mold, and then input the data of the lower mold opposite to the data of the upper mold into the CNC machine tool to process the molding surface of the lower mold _P1 .

Next, as shown in FIGS. 6A and 6B , the molding surfaces P ₁ , P ₂ of the first and second resin compacts B ₁ , B ₂ are polished (hereinafter referred to as a polishing process). The molding surfaces P ₁ , P ₂ are manually polished with sand paper 6 , however, electric files can also be used instead of sand paper 6 .

As shown in FIG. 7 , when the first and second resin blocks B ₁ and B ₂ are matched, the molding surfaces P ₁ and P ₂ are closely attached to each other.

So far, the stamper shown in Fig. 1 has been manufactured. The first resin block _B1 becomes the lower mold, and the second resin compact _B2 becomes the upper mold.

As for the working order of die processing, in addition to performing the datum plane processing, cutting and polishing of the first and second resin blocks _B1 and _B2 synchronously as mentioned above, the first Resin blank _B1 carries out its datum plane processing procedure, cutting processing procedure and polishing procedure, first processes a lower die, and then carries out its datum plane processing procedure, cutting processing procedure and polishing procedure on the second resin compact _B2 , Process the upper mold. In addition, it is also possible to firstly carry out the datum plane machining process, the cutting process and the polishing process on the second resin compact _B2 , first add the upper mold, and then carry out the datum plane machining process on the first resin compact _B1 , cutting The machining process and polishing process process the lower mold.

According to the method of manufacturing a stamper as described above, it is not necessary to use a master mold and a plaster mold to form a molded surface as in conventional methods. The first and second resin compacts B ₁ , B ₂ can be easily formed by laminating the board 1 without resin injection molding. In addition, the molded surfaces P ₁ , P ₂ are superior in accuracy to those formed by resin injection molding because they are machined with a numerically controlled machine. This method takes less man-hours than the conventional method in manufacturing the experimental stamper, about one-third of the conventional method.

The first and second resin compacts B ₁ , B ₂ are all made of a single material (resin), so that the design can be easily changed by cutting the previously formed molding surfaces P ₁ , P ₂ . In addition, the molded surfaces P ₁ and P ₂ can also be cut into planes, and then new molded surfaces can be processed on the planes. In other words, the first and second resin compacts B ₁ , B ₂ can be recycled.

As for the material of the plate 1 forming the first and second resin compacts B ₁ , B ₂ , any resin including ABS resin can be used.

The stamper manufactured by the above-mentioned method is excellent in wear resistance and compressive strength. For example, more than 100 steel plate parts with a thickness of 0.8 mm can be produced. In addition, the first and second resin compacts B ₁ , B ₂ can be cut into small pieces and thrown away after use.

Although only preferred embodiments of the present invention have been described in this specification, it should be understood that the above description is illustrative rather than restrictive, since various changes can be made within the scope of the spirit and essential characteristics of the present invention. .

Claims (5)

1. A method of manufacturing a stamper, characterized in that it comprises the steps of: forming a pair of first and second resin compacts by laminating a plurality of pieces of resin; forming a flat reference surface by machining one surface each of the first and second resin blanks; and A pair of opposing molding surfaces are formed by machining the respective other surfaces of the first and second resin compacts using a numerically controlled machining tool. 2. A method of manufacturing a stamper, characterized in that it comprises the steps of: forming a pair of first and second resin compacts by laminating a plurality of resin plates; forming a flat reference surface by machining one surface of each of the first and second resin compacts; forming a pair of opposing molding surfaces by machining the respective other surfaces of the first and second resin compacts using a numerically controlled machining machine; and The molded faces of the first and second resin compacts are polished. 3. A stamper characterized in that first and second resin blocks composed of first and second resin sheets composed of a plurality of laminated resin sheets are formed with a flat Reference planes, a pair of opposing molded planes are formed on the respective other surfaces of the first and second resin compacts. 3. A stamper, characterized in that first and second resin blocks composed of a plurality of laminated resin plates are formed with a flat reference plane on one side of their respective lamination directions, and in the above first and second A pair of opposite molding surfaces processed by a numerically controlled machining tool are formed on the other surfaces of the two resin blocks. 4. A stamper, characterized in that first and second resin blocks composed of a plurality of laminated resin plates are formed with a flat reference plane on one side of their respective lamination directions, and in the above first and second A pair of opposite molding surfaces processed by a numerically controlled machining tool are formed on the other surfaces of the two resin blocks.

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