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#018 Basics of Blanking Work (8) Outer Cutting Work - 2

Category : Shearing work
November13, 2009

Figure 1 shows an example for forming an outer contour shape using slot cutting and cutting. Slot cutting forms the shape along the width direction of the material and the shape along the feeding direction is formed by cutting, thereby saving material. Since cutting operations are used, the direction of the burrs in the product will be different in some parts when compared with other parts.

Fig. 1 Blanking work using slot cutting and cutting

Figure 2 shows an example for forming an outer contour shape using slot cutting and segmenting. In this form, the direction of the burrs is the same along the entire periphery of the product. This method can be said to be the most frequently used one among all the methods of forming shapes by outer cutting.

Fig. 2 Blanking work using slot cutting and segmenting

In this method for forming a shape, one blank and the next blank are connected near the center of the material. Depending on the product, guiding along the width direction may become difficult. As a countermeasure for this, the forming method shown in Fig. 3 can be used. This is a method in which the original material width is made to remain the same by as much as possible. In order to do this, hole punching operations will become necessary in addition to slot cutting work. By using hole punching work, it is possible to form the shape while maintaining the original width of the material. The advantage of this type of method for forming an outer contour shape is that, not only the material can be guided easily, but also it is possible to prevent the reduction in the strength of the material. The drawback is that the loss of material becomes somewhat larger. This is an example of forming the outer shape using slot cutting and segmenting. In this form, the direction of the burrs is the same along the entire periphery of the product. This method can be said to be the most frequently used one among all the methods of forming shapes by outer cutting.

Fig. 3 Blanking work using slot cutting, segmenting, and hole punching

Outer cutting work is not merely forming the shape of the outer contour, but is used for forming the blanking shapes of products that include bending, etc., in progressive cutting work. In outer cutting work, the design of the blanking shape punch is free. It is free to use any of the slot cutting, segmenting, hole punching, cutting, and slit cutting works. On the other hand, there are many cases of failures. Designing should be done taking care so that the number of punches used for outer cutting is made as small as possible, that there is a balance among the strengths of different punches, and that the shapes are simple.

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