Die casting mold production requirements

A mold with a correct and reasonable structure is a prerequisite for the smooth progress of die-casting production and plays an important role in ensuring the quality of castings. Due to the characteristics of the die-casting process, the correct selection of process parameters is the decisive factor for obtaining high-quality castings, and the mold is the prerequisite for the correct selection and adjustment of various process parameters. The mold design is essentially to predict the various factors that may occur in the die-casting production. The comprehensive reflection. If the mold design is reasonable, there will be fewer problems encountered in actual production, and the qualified rate of castings will be high. On the contrary, the mold design is unreasonable. For example, the wrapping force of the movable and fixed molds is basically the same when the casting is designed, and the gating system is mostly in the fixed mold, and it is produced on the Guannan die-casting machine where the punch cannot feed after the injection, so normal production cannot be performed. The casting has been stuck to the fixed mold. Although the finish of the fixed mold cavity is very bright, the phenomenon of sticking to the fixed mold still occurs due to the deep cavity. Therefore, when designing the mold, it is necessary to comprehensively analyze the structure of the casting, be familiar with the operation process of the die-casting machine, understand the possibility of adjusting the die-casting machine and process parameters, grasp the filling characteristics under different conditions, and consider the method of mold processing and drilling. Only after the eyes and the fixed form can we design a mold that is practical and meets the production requirements.

Controlling the surface temperature of is essential for the production of high quality die castings. Uneven or inappropriate temperature can also lead to instability of the casting size. During the production process, the casting deforms, resulting in defects such as hot pressing, sticking, surface depression, shrinkage, and hot air bubbles.

When the temperature difference of the zinc die-casting mold is large, it will affect the variables in the consumption cycle, such as filling time, cooling time and spraying time. There will be cold lines, the main reason is that the temperature in front of the melt soup is too low, and when there are traces, they stack up.

Improvement method:

1. If the thickness of the wall is too thin (designed or manufactured), then the thinner area should be directly filled.
2. The shape inspection is not easy to fill, the interval is too far, the blocked area (such as the blade (tail), cam), the blocked area, the fillet is too small, and other types of filling.
3. Shorten the filling time
4. Change the filling form.
5. Improve the temperature.
6. The temperature of the soup
7. Check the composition of the alloy.
8. Fleeing may be useful
9. A vacuum installation can be useful.

When manufacturing a pressure , not only the temperature of the zinc mold is controlled. There are some details. The net shape of the zinc alloy can show color differences, appearance damage and other problems.

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