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Cause and treatment of sticking and punching of powder molding press

Author: ComeFrom: Date:2017/8/21 17:34:24 Hits:2100
  Cause and treatment of sticking and punching of powder molding press:
  1、The surface of the punch is damaged or the surface finish is reduced. It may also have antirust oil or lubricating oil. The surface of the new die is rough or the lettering is too deep and has edges and corners. The punches can be wiped off, replaced by dies with different specifications or by a trace of liquid paraffin on the surface of the lettering punch so that the words are lubricated literally. In addition, if the mechanical heating caused by sticky stamping, should check the reasons, overhaul equipment.
  2、The design of engraving and punching characters is unreasonable. Change punches or change character designs accordingly.
  3、Excessive water content or uneven wetting and drying of particles cause sticking. Solution: control the moisture content of particles around 2%~3% and strengthen the dry particle inspection.
  4、Lack of lubricant or improper selection, excessive fines. Lubricant dosage should be increased or new lubricant should be removed to remove too much fine powder.
  5、The fineness of raw materials varies greatly, resulting in uneven mixing or improper mixing time. Solution: to the raw materials for crushing, screening, so that the fineness to meet the quality requirements of the species, while master and control the mixing time.
  6、Low adhesive concentration or adhesive force resulting from adhesive quality, too much fine powder (more than 10%) and sticky. Solution: sieve the fine powder with 40 mesh sieve, then re granulation, dry, and then evenly mix the whole batch, then press again.
  7、Due to the raw material itself (such as moisture absorption) caused by adhesive impact. Solution: add a certain amount of absorbent (such as adding 3% calcium hydrogen phosphate) to avoid sticking.
  8、Excessive environmental humidity and excessive humidity. Lower environmental humidity.
  9、The operating room temperature is too high, easy to produce sticky punching. Attention should be paid to lowering operating room temperature.

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