JPS5882700A - Method and device for punching soft material - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method and a punching apparatus for punching soft materials, which are conventionally used for punching soft materials such as sheet rubber, rubberized cloth, cloth, and soft synthetic resin molded products. As shown in Fig. 5, a punched board 1 made of cardboard with a smooth surface or a semi-hard synthetic resin such as vinyl chloride or acrylic is used as a punching board 1 made of a strong hard material such as iron or concrete. The soft material 3 is placed on the upper surface of the punching plate 1 placed on the substrate 2. The method used was to punch out an arbitrary shape by pressing down to a thickness of 1 mm and 2 mm. According to this conventional method, the blade of the punching die 4 is recessed in the punching plate 1, and the position where the blade is formed must be constantly moved so as not to come into contact with the sheet material during the next punching. This movement requires manpower, and if the punching board 1 has a blade shape exceeding a certain limit, the punching board 1 must be replaced, and the punching board 1 is severely worn out, making it expensive and unusable. It was economical. In addition, since the punching die 4 bites into the punching plate 1, the blade of the punching die 4 is severely worn out, and the punching plate 1 is cut little by little, producing chips, which adhere to the punched soft material 3. Therefore, a process was required to remove this. In addition, at the same time that the cutting edge of the punching die 4 bites into the punching board 1, the soft material 3 is also drawn into the biting part and deforms, and the cut surface is deformed in an unspecified manner different from the cutting edge of the punching die 4, resulting in precision cutting. It was a hindrance.

The present invention eliminates the above-mentioned drawbacks, and an embodiment thereof will be described below with reference to the drawings. Reference numeral 10 denotes an elastic buffer body placed on a substrate 11 that is easily deformed and restored, and is made of open-cell foam. It is made of soft synthetic resin, sponge, a plurality of coil springs 10a as shown in 4g, etc., and does not deform even if a punching plate 12 made of a hard material and a soft material for punching are placed on the top surface. It is desirable that the material has enough elasticity to sensitively react and contract and deform when a pressing force is applied from the upper surface during this placement.

The punching plate 12 made of a hard material is made of an iron plate, a stainless steel plate, etc., and has a thickness of about 3 mm and has a smooth surface polished. Reference numeral 13 denotes a soft material for punching and molding, which is made of a soft material such as a laminate of metals, a soft elastic synthetic resin molding, or the like.

14 is a punching die located facing the upper surface of the soft material 13;
The cross-sectional shape of the cutting edge 15 is formed into a draft shape, and the planar shape is formed to match the target shape of punching, and is attached to a Luss device, so that the lowest point of the cutting edge 15 during punching operation is in a non-pressed state. It is set approximately 1,510 m below the armpit from the front side of the punching plate 12 at the time.

In the structure as described above, when the punching die 14 is lowered after placing the soft material 13', which is the object to be punched, on the surface of the punching plate 12, the punching die 14 forms a chain 2 as shown in Figure 2. Soft material 1
When the cutting edge 15 contacts the punching plate 12, the punching plate 12 compresses the elastic buffer 10 and moves downward as shown in FIG.
2 is never deformed or the cutting edge 15 bites into the punching plate 12 at all. The cushioning body 10 was a sponge, the punching plate 12 had a hardness of HHB90, and punching was performed by setting the lowest point of the punching die 14 1.5 mm below the surface of the punching plate 12 in the non-pressed state. In one embodiment, the punching plate 12
Only a blade shape with a depth of about 2/1000 mm was formed on the surface. In addition, the cut surface of the soft material 13 does not become thinner and deformed as in the conventional case, but has a shape that corresponds precisely to the shape of the cutting edge 15 of the Fi type 14, and the precision of the cut shape is improved. According to the conventional method, as the cutting edge 15 bites into the punching plate 12, the soft material also deforms and follows, and is drawn into the punching plate 12, deforming the cut surface and impairing precision. However, according to the method of the present invention, the punching plate 12 moves downward at the same time as the cutting edge 15 punches and cuts the soft material, and the cutting edge 15 does not bite into the punching plate 12. The blade can be cut with high precision into a shape that corresponds to the shape of the cutting edge. Father -
In the embodiment, the soft material 13 was formed into a sheet, but in other embodiments, a part of the sheet may be uneven, or the sheet may have a U-shaped cross section with a flange on the outer periphery of the opening. Of course, it is also possible to punch out the soft material 13 that has been formed into an arbitrary shape, such as by forming the soft material 13 into an arbitrary shape. The shape must be compatible.

As described above, in the present invention, since the blade shape formed on the punching plate is relatively shallow, it is not necessary to move the punching plate every time punching is performed. At the same time, it becomes possible to punch out an extremely large number of soft materials with a single punching board, dramatically reducing the consumption of punching boards and increasing economic efficiency. Since there is no biting, no chips are generated, and as mentioned above, the cutting surface can be cut precisely in accordance with the cutting edge of the punching die, making it possible to improve the machining accuracy.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, and 1st wJ is a cross-sectional view showing the state before punching, FIG. 2 is a cross-sectional view at the start of punching, and FIG. 3 is a cross-sectional view showing the state of movement of the punching board. 4 is a cross-sectional view showing another different embodiment, and FIG. 5 is a cross-sectional view showing a conventional example.
Fig. 111.

Claims (2)

[Claims] (1) A soft material for punching and molding is placed on the upper surface of a punching plate made of a hard material with an elastic buffer that can easily be deformed and restored, and the soft material is punched in a non-pressing state. The eel is punched and formed using a punching die whose descent point is set slightly below the surface of the board, and the impact applied to the punched board is
% The fact that the cushioning material is deformed and contracted to absorb
A method for punching out soft materials that become moldy. (2) An elastic shock absorber placed on the substrate that can be easily deformed and restored, and a punch made of a hard material placed on the top surface of the elastic shock absorber for placing a soft object to be punched and formed on the surface. A soft material punching device comprising: a plate; and a soft material punching die having a lowermost point slightly below the one surface position of the punching plate in an unpressed state.