Cutting operation is a simple type of shearing work. If this method is used, it is possible to carry out work with a good yield using a simple die.

Figure 1 shows a cutting work. The material is cut along a single line. Because of this, the direction of burrs after cutting at the left and at the right will be opposite to each other. Depending on the product, this method may not be able to be used because of the specifications of the direction of burrs, but if this method can be used, it is possible to carry out work without any scraps thereby making the rate of utilization of the material very high.

There are limitations such as those shown in Fig. 2 in carrying out the work along a single line. In other words, the shapes should be the same at the left and at the right. Some times it is possible to carry out shearing work by slightly changing the product shape therefore it is desirable to use shearing work.

The relationships among the punch, die, and clearance in shearing work will be as shown in Fig. 3. The product dimensions will be shorter than the length of the feed by an amount equal to the clearance. Among blanking operations, the method of setting the clearance is special only in this type of work, and hence care should be taken in regards to this. The reason for this is that the work is done along a single line.

Another cause of trouble due to working along a single line is shown in Fig. 4. Since this is a one sided piece, because of the bending moment generated at the cut part, the material below the punch becomes inclined. If the cutting is made as it is in that condition, even the cut surface of the product becomes inclined. As a countermeasure, the size of the clearance is made less than half the clearance of normal blanking operations. As a strong measure, the inclination of the material during working is suppressed by providing a reverse pressing member in the die.

If a simple method of work can be used, even the preparation of dies becomes easy, and the cost gets reduced. It is important to review one's work by remembering the basics.