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#136 Design of Blanking Dies (9) Design of a Fixed Stripper (3)

Category : Shear Forming
November30, 2012

As shown in Fig. 1, a fixed stripper can be thought of as being composed of two parts, namely a stripper portion and a stock guide portion.

Fig. 1

If the stock guide portion is made so that it is easy to insert the stock, the die becomes easy to use in press operations. If the stock guide portion is made a separate part, it is possible to make the stock guide long as shown in Fig. 2, and in addition, to provide a stock receiving plate so that the stock is placed first and then pushed in.
If the die is small, there is not much effect on the press operations even if the fixed stripper is prepared integrally with the die, but if the die becomes large, it becomes cumbersome to insert the stock into the die. This is a countermeasure for such situations.
Fig. 2

During processing using a coiled stock, once the stock is inserted in the die there will be no problems for some time.

In the case of processing stocks of fixed lengths, when the stock is inserted from the front of the die and the processing is carried out towards the deep end, a stock table for supporting the stock is placed at the front of the die so that when both hands are used for operating the press buttons of the press machine, the stock will not slide and fall off when the operator takes his hands off the stock.

Therefore, very often, when about half the length of a fixed length stock has been processed, the stock is withdrawn and inserted and processed again from the other end. If this is not done, it is difficult to carry out the work (and also dangerous). However, it may be difficult to carry out the work because the stock may come above the press buttons of both hands.

In view of this, sometimes the processing is carried out by moving the stock in the left - right direction. Even in such operations, the press machine is operated by taking both hands off from the stock and pressing the buttons of the press machine. If the die is prepared without thinking about this, the stock will droop when both hands are taken off it, and it becomes impossible to carry out the work. Fig. 3 shows a measure for carrying out the processing while making the stock move in the left - right direction.

Fig. 3

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