Numerical control turret punch mold use and maintenance methods

Some technical points that should be followed in the use and maintenance of CNC turret punch press molds, and corresponding solutions to practical problems, may have a good guiding role for users.

First, to ensure the best mold clearance

The die gap is the sum of the gaps between the two sides of the punch into the lower die. It is related to plate thickness, material and stamping process. Selecting the right mold clearance can ensure good punching quality, reduce burr and collapse, maintain sheet leveling, effectively prevent tape, and prolong mold life.
By checking the situation of stamping waste, it can be determined whether the mold gap is appropriate. If the gap is too large, the waste will have a rough undulating fracture surface and a smaller shiny surface. The larger the gap, the larger the angle formed by the fracture surface and the bright surface. When the hole is punched, curling and breaking occur, and even a thin edge protrusion appears. Conversely, if the gap is too small, scrap will appear with a small angle fracture surface and a larger shiny surface.
When performing local punching such as slotting, nibbling, shearing, etc., the lateral force will cause the punch to deflect and cause the unilateral clearance to be too small. Sometimes the edge deviation will scratch the lower die, causing rapid wear of the upper and lower molds.
When the die is punched with the best clearance, the fracture surface and the glossy surface of the scrap have the same angle and coincide with each other, so that the blanking force can be minimized and the burrs of the punching holes can also be small.

Second, timely grinding can effectively extend the life of the mold

If the workpiece has excessive burrs or unusual noise during stamping, the mold may be passivated. Check the punch and the lower die, and sharpen the edge when it wears to create an arc with a radius of about 0.10 mm.
Practice has shown that frequent sharp grinding rather than waiting until the non-abrasive can not only sharpen, not only will maintain a good workpiece quality, reduce the blanking force, but also can extend the life of the mold more than doubled.
In addition to knowing when the mold is sharpened, it is especially important to have a proper sharpening method. The mold grinding procedure is as follows:
(1) When sharpening, the punch is clamped vertically in the V-groove or fixture of the magnetic chuck of the surface grinding machine, and the grinding amount is 0.03-0.05mm each time, and grinding is repeated until the punch is sharp. The maximum grinding amount is generally 0.1~0.3mm.
(2) The use of sintered alumina grinding wheel, hardness D ~ J, abrasive grain size 46 ~ 60, the best choice for high-speed steel grinding wheel.
(3) When the grinding force is large or the mold is close to the grinding wheel, adding the cooling liquid can prevent the mold from overheating and cracking or annealing, and the quality and multi-purpose cooling liquid should be selected according to the manufacturer's requirements.
(4) The feed rate of the grinding wheel is 0.03~0.08mm, the feed rate is 0.13~0.25mm, and the feed rate is 2.5~3.8m/min.
(5) After sharpening, use whetstone to sharpen the cutting edge to remove burrs, and grind a fillet with a radius of 0.03 to 0.05 mm to prevent the edge from cracking.
(6) The punch is demagnetized and sprayed with lubricating oil to prevent rust.

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