The purpose of die maintenance is to quickly find out the problem and solve it, so that the die can be restored to its original state and can continue to produce standard products. The products made by the same mold have the same size and shape, that is, part or all of the size and shape are completed after each project is processed. Therefore, when there is variation in the product, the processing station can be found according to the variation position, and the The repair will restore the original state, and if it is determined that the design is wrong, the design will be changed. Mold maintenance is based on this principle. The following points can be used as a reference for maintenance: 1. Measure the finished product, check the inspection standard to determine the variation, check the Layout to measure whether the size of the project is the same as the mold drawing, and whether the size varies, it must be measured if necessary. Before and after the relevant projects to accurately determine the variation and cause, and then implement countermeasures to solve. 2. When it is impossible to judge or propose countermeasures, you should consult others for advice, and do not act arbitrarily. 3. The hair head is too large a. The knife edge is worn: regrind. b. The gap is too large: most of the sides are polished strips, the brightness is low, and the gap is reduced. c. The material is too hard: replace the material or increase the gap. d. Die chipping: regrind.

4. Dimensional variation a. Knife edge wear: the hair head is too large or the size becomes larger (cutting shape); becomes smaller (punching); the flatness is not good, regrind or replace the die. b. No guide: the guide pin or other positioning devices are ineffective, the feeder is not loosened or the guide pin diameter is insufficient, the guide cannot be corrected, the positioning block is worn, and the feeding distance is too long. c. Improper ejection: Improper configuration of ejector pins, inappropriate spring force or too long ejection, adjust the elastic force or change the position or the number of ejector pins, and the pins are ground for a short fit. d. Punching shear deformation: the material is twisted unevenly, and the size is eccentric and asymmetric. 5. Die damage a. Stamping stacking: The stacking of sheets still continues to stamp, which usually leads to the breakage of the stripper. b. Waste blockage: The blanking hole is not drilled or the size is inconsistent, or the punching table is not cleaned in time, and the punch and the lower template are damaged more. c. The punch falls: it is not fully fixed or suspended, or the screw is too thin and the strength is not enough, or the punch is broken. d. Insufficient escape hole: The size or depth of the escape hole of the punch press plate is not enough, and the insufficient escape hole of the punch and the stripper plate usually leads to the damage of the stripper plate. e. Foreign matter entry: The product is blown back or not blown out, the mold parts are broken and dropped, the screw protrudes from the mold surface or other items enter the mold, which may damage the lower mold, stripper plate, punch or guide post. f. Assembly error: the wrong position and direction of the parts are damaged. g. Spring factor: Insufficient or broken spring force or unequal height of the sleeve makes the stripping plate inclined, or the spring is improperly configured, resulting in overlapping punching damage to the parts. h. Improper punching: the working height is adjusted too low, the guide column loses oil, the material belt is sent by mistake or half punched, the peripheral equipment such as sending, releasing, the receiving machine is damaged, the air pipe is not installed or closed, the punching machine is abnormal, etc. damage caused. i. Improper maintenance: the above points occur because the replacement is not replaced or the screws are not locked or restored as they were.

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