Failure and maintenance of 1. punch
Punch is the most frequently maintained part, and its main fault is breaking. The main reasons are: the length of the punch is too long, the gap between the convex and concave die is not uniform, the unloading plate is not stable during the stamping process, the gap between the punch plate, the discharge plate and the punch is too large, and the waste die waste is excluded from the unblocked.
Therefore, the punch length is generally not more than 35mm to ensure that it has sufficient rigidity; the die and discharge plate should be guided by four small guide columns fixed on the fixed plate of the punch to ensure that the clearance of the convex and concave die is uniform and a number of small punch guides. The unloading screw on the discharge plate is used as an equal height sleeve to ensure that it is punched. In order to ensure the smooth removal of the punching waste, the cutting edge should be lapping regularly to ensure the sharpness.
Failure and maintenance of 2. die
Because the material is soft and the thickness is about 11mm, it is almost close to the no gap mold. In order to ensure the die gap and the quality of the punching hole, the die materials choose 45# steel without heat treatment. In addition, hollowing out of the effective cutting edge of the concave die will result in excessive wear and collapse of the cutting edge of the die. Therefore, the concave die should be designed as a mosaic structure, and more spare parts should be prepared to facilitate the timely replacement.
Maintenance of gap between 3. punch and die
The wear of convex and concave die, especially the wear of the die, increases the gap of the die, causes the edge of the hole to be hairy, the size becomes larger, and the small copper hammer should be used in time to gently strike the rim of the die inlaid with the die without heat treatment. The shape of the die is smaller by the plastic deformation of the die, and the surface of the die is then on the grinding machine. Remove the 11mm on the top, close the upper and lower die, and run the empty stroke 5-10 times until the edge of the punched hole has no edge.
The clearance between the small punch and the discharge plate should be checked regularly to ensure that it is less than the clearance of the mold and to add the lubricant in time. If the gap is too large, the insert on the discharge plate should be replaced in time. The guide column is the key part to ensure the uniform gap between the die and the die. It should not only guide the discharging plate, but also guide the die. Only in this way can the clearance of the die be uniform and reasonable.
Maintenance of 4. positive nailing
The location of pins and pads on flexible circuit boards is ensured by the location of locating holes, which are pre processed on CNC drilling machines. The position and quantity of the guide pin on the die are not fixed. Due to the different environmental temperature and material, the flexible PCB will produce unequal shrinkage, which leads to the deviation of the hole position. Therefore, attention should be paid to adjusting the position and relative quantity of the guide pin to ensure the quality of the product.
5. punching waste jumps and Solutions
Because of the electrostatic action of flexible materials, the punching waste is often adsorbed together, and it is difficult to remove from the leakage of the mold. Some of the waste will even be adsorbed on the punch, which seriously affects the subsequent blanking. Therefore, the depth of the punch into the concave die should be increased to about 1mm, so as to ensure that the waste material is completely removed from the lower die.
Maintenance and maintenance of 6. die
When the mold is not used, it should be coated with rust oil in time, but attention should be paid to the next use of the mold, the oil should be cleaned first, and the oil sucking paper is tested until the oil is adsorbed. Otherwise, the quality of the electroplating will be affected.
When moving the mold, it should be light, stable, and slow to avoid shock and intense vibration. Two. Storage must have a fixed position, to control the humidity of the air, to avoid dust or sundries falling on the shelf, and strictly prohibit directly placed on the cement floor.
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