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The stripping plate 22 and the shoulder screw 13 and the spring 7 constitute a discharging mechanism for taking off the pressing member of the hoop 23, and the spring serves to support the stripping plate and can ensure the stripping plate and The shoulder screw is moved up and down to reduce the length of the punch and make up for the insufficient stroke of the press.
The punch 23 and the punch press ring 4 are also tapered, and are positioned by the shoulder of the punch press ring and the groove of the upper die plate 2, and are tightly connected to the upper die plate by the hexagon socket screw 3.
The guide sleeve 6 and the guide post 11 are press-fitted into the upper template and the lower template respectively to form a guiding system, so that the hot extrusion die has high precision and reliable operation. Due to the connection of the guiding system, a complete set of anti-extrusion dies is formed.
Tap water is introduced through the pipe joint 20 to achieve die cooling. The anti-extrusion die can be made in one piece or in a nested form.
On the side of the reverse extrusion die, the upper anvil block 5, the lower anvil block 8, the height adjustment block 9, the pin 21 and the adjusting screw 14 are formed into a thickened table. The purpose of setting the upsetting table is mainly to remove the scale and change the diameter of the blank.
When the entire reverse extrusion die is mounted on the press, it is positioned by the die handle 1 and the press. As can be seen from Fig. 3, as long as the punch, the die and the stripper are replaced, a different size of the anti-extrusion cup-shaped extrusion can be produced.
2. Calculation of the main dimensions of the anti-extrusion die
The combined extrusion die is shown in Figure 4. The calculation of the size is usually based on the outer diameter of the extrusion, the working diameter of the concave mold cavity is first calculated, and then the dimensions of the other parts are calculated according to the working diameter of the concave mold cavity.
Figure 4 reverse extrusion die
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