Introduction To China Nut Improvement

    1. China Nut takes improvement measures on the punch
      (1) When the material is very thin, it is easy to be adsorbed on the bottom of the punch due to oil adhesion, magnetism, vacuum and other reasons. Improve the punch to reduce the contact area between the punch and the waste, thereby reducing the convexity. Absorption of waste by the mold.
            (2) The ejector punch of the spring pin. Step holes are processed in the punch, and the punch pins and springs are set. During blanking, the extrusion of the sheet material presses the pin into the punch. When discharging, the knocking pin is ejected by the spring, and the waste material on the suction convex mold is pushed into the concave mold, and the waste material will not move up.
            (3) Punch with air holes. An air hole is processed in the center of the punch. The air hole is connected with high-pressure air. After the punching is completed, the high-pressure air blows off the waste and blows out the working range of the mold.
            (4) Slant cutting edge punch. The cutting edge of the punch is processed into a material surface. When punching, one end of the cutting edge first contacts the material, and the material is cut as the punch deepens, so that the waste and the punch are not easy to form a vacuum to prevent the waste from moving up.
            (5) In mass production, the punch edge will generate magnetism due to friction and attract waste, so it must be demagnetized regularly.
            2. Take improvement measures on the die
            (1) The waste is not easy to be blocked, is easy to fall, and has the effect of preventing the waste from moving up.
            (2) On the inner wall of the cavity, process two or more inclined grooves from the center to the opposite direction, and the depth is about 0.005mm-0.1mm. In the early stage of blanking, the blanking waste will form small protrusions corresponding to the inclined groove of the die. As the male mold is further pressed in, the protruding part will be compressed by the side of the female mold and the friction will increase, thereby preventing the waste from moving up.
            (3) The inner side wall of the mold is designed to be convex in the depth direction of 2mm to 3mm, and the thickness is about 0.01 mm. As the punch further presses the person, the waste is squeezed here, and the friction increases, which can prevent the waste from moving up.
            (4) For punching holes that do not require high dimensional accuracy, use coarse-grained grinding wheels when grinding the straight wall of the die, so that the roughness of the straight wall of the die should not be too high to reduce the possibility of waste moving up;
            (5) Since the waste material collides with the lower part of the cutting edge of the die, burrs will be blocked and the waste will move up, so the lower part of the straight wall of the die needs to be polished.
            (6) The straight wall part of the concave mold is too long, which is easy to cause the waste to move up, so the depth of the concave mold can be minimized under the premise of ensuring the strength.
            3. Other improvement measures
            (1) When the waste is prone to move up, the depth of the punch inserted into the female mold should be controlled between 3mm and 5mm, and the clogged waste is limited to three pieces.
            (2) Choose a reasonable blanking gap value and modify it.
            (3) During mass production, magnetism will be generated due to the friction between the punch and the die, so the cutting edge should be demagnetized regularly.
            (4) Use vacuum to generate suction, increase the surface and roughness of the inner surface of the cutting edge of the die, make a small chamfer on the cutting edge of the die, and change the contour shape and blanking gap.
            (5) The leakage part of the lower part of the Bolt Factory die should be kept unblocked and the structure should be reasonable.