blowingmolding

That is, the pin 3 traverses the punch 5, hangs in the circular countersink of the mounting plate 4, and then is screwed into the screw hole of the upper die base 2 with the hexagon socket screw plug 1, thereby pressing the punch and carrying the punch against the die base The reverse impact force can press the punch more than the pad, so that the manufacturing accuracy of the length of the punch can be greatly reduced. Therefore, when processing the concave mold, pay attention to the relationship between the outer shape of the concave mold and the positioning size of the crescent hole. Then use four pressing plates to press on the workpiece.1. The indexing mechanism is the key mechanism for stepwise punching of 25 double-row crescent shaped holes. Whether the positioning size of the crescent shaped holes can meet the design requirements of the workpiece depends on the index plate 11, the positioning axis 12 and the operation index plate rotation and The size of the positioning pin 5 and the support 6 and the matching installation accuracy. Design of die structure and fixed form

There are many types of concave molds, which are divided into round and plate shapes according to the shape, integral and mosaic according to the structure, flat blades and inclined blades according to the shape of the cutting edge, straight cylinder and tapered according to the shape of the hole [ 1], the die structure is shown in Figure 6. Conclusion

Production experiments show that the crescent-shaped manual indexing punching die of the stainless steel impeller disk can realize manual indexing and punching of 25 uniformly distributed crescent-shaped holes on the parts, and the size of the stamped parts meets the requirements of the drawings. A straight-through punch as shown in Fig.

Author: Mengshao Ming Nie Huiping Chen Chen Unit: Hunan College of Chemical Technology in Aviation Industry South Aviation Industry

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Community. Use Figure 7 for positioning and clamping. 2 that the crescent hole is non-circular and the wall thickness of the punch is only 2mm (R42-R40 = 2mm). 6 stepped holes with diameters of Φ9mm and Φ15mm and counterbore depth of 12mm). 5 is designed, which is fixed by a pin and a cross pin. Workpiece positioning and clamping method

The positioning method of the mold is used to ensure the correct feeding of the strip (blank) and the correct position of the single blank in the mold [1].

6. The fixing method adopts 2 pin positioning (2-Φ8mm hole in Fig. So that the pressure plate can move around in the screw 1 (after the first positioning and clamping, the pin 8 must be pulled out so that the workpiece can be indexed with the index plate).

2. 5) and 2 hexagon socket countersunk head screws (Fig. To facilitate installation and removal of the workpiece, a round hole is processed in the pressing plate.

3. The integral plate-shaped straight cylinder opening structure is adopted, and the outer shape of the concave mold is designed according to the positioning size of the crescent-shaped hole. For this purpose, two annular grooves are processed in the lower mounting plate to reduce the lower mounting plate and The contact area of ​​the indexing plate solves the problem of over-positioning), using the material pin and the positioning pin to achieve the initial positioning of the blank, using the pressure plate to clamp the blank, and indexing the indexing plate through the shaft pin in the indexing mechanism, In order to achieve manual indexing punching of the crescent hole of the workpiece (to ensure the accuracy of the workpiece and the requirements of several special positioning dimensions, special attention should be paid to the assembly accuracy of the indexing plate, positioning shaft and lower mounting plate, and the indexing mechanism pin during mold assembly Installation accuracy of shaft and index plate hole).

4 Indexing mechanism design

The indexing plate and indexing mechanism are shown in Figure 8. Moreover, the operation is convenient, the life of the mold is long, and the product quality is stable, which brings good economic benefits to the enterprise.

5. In order to prevent the workpiece from being crushed, copper plating is carried out at the pressing position of the pressing plate (copper plating 3 in Figure 7). Design of punch structure and fixed form

It can be seen from Fig. Use four stop pins 6 installed in the index plate 7 to be stuck in the Φ130mm inner hole (as shown in the part drawing in Figure 1), and then use the blowing machine parts suppliers positioning pin 8 to insert into the Φ20mm hole (the hole with the widest Φ6mm hole spacing), Until it is inserted into the corresponding positioning hole of the lower mold base. In order to meet the design requirements, a bushing 4 is installed in the indexing hole of the index plate, and a bushing 7 is also installed in the hole of the support [9-10]. Mold assembly

The mold uses a positioning shaft to position and index the indexing plate (but the indexing plate has been positioned in the positioning shaft and the lower mounting plate