Summary:1. Standard parts and specificationsThe selection method of standard specifications for molds is best to consider the following matters:(A). When the content of the specifications to be used is not limited, it is best to use the highest level.(B). St......
1. Standard parts and specifications
The selection method of standard specifications for molds
is best to consider the following matters:
(A). When the content of the specifications to be used is not limited, it is best to use the highest level.
(B). Standard numbers are used in principle.
(C). If the standard part of the mold does not have this size, the closest one is used for processing.2. Design of punch
The punch can be roughly divided into three parts according to its function:
(A). The tip of the cutting edge of the material to be processed (the cutting edge has an irregular shape, a square shape, a round shape, etc.).
(B). The contact part with the punch fixing plate (fixed part or shank, its cross-sectional shape is irregular, square, round, etc.).
(C). The connecting part (middle part) of the blade part and the shank part.
The design basis of each part of the punch is from:
(a). The length of the cutting edge,
(b). Grinding direction of the cutting edge,
(c). Briefly describe the fixing method of the punch and the shape of the handle.3. Design of the punch fixing plate
The thickness of the punch fixing plate is related to the size of the die and the load. Generally, it is 30~40% of the length of the punch, and the length of the punch guide should be higher than 1.5 times the diameter of the punch.4. Design of guide pin (punch)
The diameter of the guide portion of the guide pin (punch) and the gap between the material guide hole, its size and the amount of protruding pressure plate are designed according to the thickness of the material. The shape of the tip of the guide pin is roughly divided into two types:
A. Cannonball shape
B. Conical (push-pull).
(a). Cannonball shape is the most common form, and there are also standard parts on the market.
(b). The conical shape has a certain angle, which is very suitable for high-speed stamping of small parts. The determining factors of the push-pull angle are the stamping stroke, the material of the workpiece, the size of the guide hole, and the processing speed. When the push-pull angle is large, it is easier to correct the position of the material to be processed, but the length of the push-pull part will be longer. The connection between the push-pull part and the cylinder part should be smooth.