How To Maintain Zinc Alloy Die Casting Mold Correctly

Zinc alloy die casting mold is one of the three essential factors in zinc alloy die casting production. The use of die casting mold directly affects the service life, production efficiency and product quality of die casting mold, and is related to the cost of zinc alloy die casting. For die-casting factories, good maintenance of die-casting molds is a powerful guarantee for the smooth progress of normal production, conducive to the stability of product quality, reduce intangible production costs to a great extent, and improve production efficiency.

Matters Needing Attention In The Production Of Die Casting Mold

Special attention shall be paid to the following points during the use of die casting mold:

(1) Use of die casting mold cooling system. When the cooling water of die-casting mold is used correctly, it not only prolongs the service life of die-casting mold, but also improves the production efficiency. The materials of die-casting molds are generally made of special die steel through various treatments. No matter how good the die steel is, it also has the limits of their use, such as temperature. When the die-casting mold is in use, if the mold temperature is too high, it is easy to make turtle cracks appear on the surface of the mold core early. Some molds even have turtle cracks in a large area before more than 2000 mold times. Even in the production of die-casting molds, because the mold temperature is too high, the mold core has changed color, and even reached more than 400 degrees after measurement. When such temperature meets the state of release agent cooling, turtle cracks are easy to appear, and the produced products are also easy to deform, strain and stick to the mold. In the case of using mold cooling water, the use of release agent can be greatly reduced, so that the operator will not use release agent to reduce the temperature of die-casting mold. The utility model has the advantages of effectively prolonging the service life of the die-casting mold, saving the zinc alloy die-casting cycle, improving the product quality, reducing the occurrence of die sticking and strain, and reducing the use of release agent. It can also reduce the loss of ejector rod and core caused by overheating of die casting mold.


(2) The die-casting mold must be preheated during the production process to prevent turtle cracks caused by hot metal liquid in the cold mold. The more complex mold can be preheated by blowtorch and liquefied gas, the mold temperature machine with good conditions, and the simpler mold can be preheated by slow injection.


(3) It is easy to ignore the cleaning of the parting surface of the die-casting mold. If the die quality is not good, it is inevitable that there will be flash or dirt on the parting surface of the die during production. The operator should clean these parts frequently and be equipped with a small shovel at any time. If the flash is not removed in time, the mold parting surface is easy to collapse, resulting in material running in the production process. Once this consequence is caused, no matter how good a mold repair expert you have, the possibility of complete repair is very small. The consequences caused by material running not only increase the cost of zinc alloy die casting, waste of white raw materials and unstable product quality, especially the internal quality, but also increase the difficulty of determining process parameters, and the qualified rate will drop a lot. From the perspective of safety, it increases the probability of industrial injury. During shift handover, the operator shall thoroughly clean the parting surface of the die-casting mold with kerosene, which can not only prevent the die from being squeezed, but also open the exhaust slot blocked by the residue of release agent or other dirt on the die after cleaning, which is conducive to the discharge of gas in the medium cavity during the injection process and improve the product quality.


(4) If the mold is equipped with neutron control, it is absolutely forbidden to have a joint on the signal line between the die casting machine and the mold. The reason is very clear. In daily production, it is difficult to avoid water on the signal line, or the place where the joint is wrapped is easy to be broken, resulting in a short circuit with the machine tool. If the signal is wrong, the alarm will be given, the automatic shutdown will delay the time, and the signal will be disordered, Break the mold. Cause unnecessary losses. The travel switch shall be waterproof.


How To Maintain Die Casting Mold

1. Mold repair personnel must master a principle in the process of maintenance, repair and maintenance. It is absolutely not allowed to change the size of the mold without permission. Carry out work on such a premise. Once the original size is changed, batch quality accidents will occur, and the loss will be very heavy.

2. All moving parts, joint parts and screws of the die shall be lubricated and antirust treated.

3. The polishing mould needs to be supplemented. Where there is adhesive and carbon deposit, it can be polished to minimize the wear of die-casting mold caused by polishing.

4. For vulnerable parts such as ejector rod and core, carefully check whether there are bends, cracks, etc. if any, replace them in time.