Sometimes, the surface of the die casting has a network of hair-like raised or sunken marks, as the number of die-casting increase and can not be expanded and extended.Visual recognition, hand touch surface and rough.

Causes:

1, die casting mold cavity surface crack

2. The used die casting mold material is improper or the heat treatment process is incorrect

3. The temperature difference between cold and heat of the mold changes too much in a very short time

4. Casting temperature is too high

5. Uneven and insufficient preheating before mold production

6. Rough surface of mold cavity

To improve the method

1. Correct selection of mold materials and heat treatment process

Longhua die casting machine adopts H13 hot die steel, which is resistant to high temperature, corrosion and easy to maintain to ensure casting quality.

2. Casting temperature should not be too high, especially for alloys with high melting point.In order to meet the production demand, the casting temperature should be as low as possible

3. Preheat the mold sufficiently and evenly. Longhua die-casting machine suggests that before the use of the mold, use liquefied gas or natural gas concentrated baking 3-5 minutes, to ensure that the mold fully uniform preheat, improve the surface problems of the die casting.

4, mold production to a certain number of annealing, to eliminate the internal stress. Longhua die-casting machine suggests that you, after each use, timely remove the impurities in the mold cavity, smear lubricating oil to maintain the mold, prolong the service life of the mold.

5. The surface of runner and cavity is not regularly polished to ensure the surface of the mold is clean

6, reasonable choice of mold cooling method, to ensure the mold heat balance