It is necessary to understand the requirements for the design and planning of precision casting molds, produce drawings of regular parts, indicate the transparency and trademark of the plastic used, explain the technical requirements and instructions of the plastic parts, and the output value, etc., and then the planners follow the requirements. Injection molding Mold planning.

When the beam still undergoes phase transformation during the cooling process, for example, the direction of the phase transformation stress and the thermal stress is the same. The beam will bend more severely. If the direction is opposite, the bending of the beam will become smaller. When the phase transformation stress is greater than the thermal stress, bending in the opposite direction will be formed. In order to avoid the inclination and thickness difference of the precision casting mold, on the one hand, the damage to the mold and the flask that can promote the inclination of the precision casting mold should be repaired in time.

At the same time, check the accuracy of the mud core manufacturing before installation. If it is deformed, it should be repaired in time; also check whether the positioning and positioning pins are moved and damaged, and check whether the positioning pins and pin holes on the sand box and template are worn and deformed. If there is deformation and damage, it must be repaired in time. On the other hand, it is necessary to strictly control the gap standard between the mud core head and the mud core seat.

How to improve the precision of precision casting molds?

When the formwork is modeled, positioning pins should be selected to ensure that the shapes of the castings in the upper and lower boxes coincide; if necessary, a mud core head with a "tenon" can be used, which can avoid the tilt of the mud core without the use of mud core support. Next, select the appropriate tonnage of the injection molding machine and determine the shape range of the mold. When planning the mold, it should be done according to the type of molding equipment, so it is necessary to understand the specifications, features and functions of various molding equipment.

Determine the type of mold again, such as injection mold, die casting mold or limit mold; according to the structure of the mold type, determine the required molding equipment, which must meet the requirements of plastic manufacturing process technology and production, and ensure the geometry of plastic parts. shape, standard precision and finish of the exterior. It is necessary to allow the molds to work continuously and have a long service life.

The final production mold drawing, according to the drawing standard requirements, combined with the factory's customary drawing method and standards, to manufacture the mold drawing, before manufacturing the general assembly drawing, the process drawing must be produced first, and the requirements of the process and part drawing must be met. If it is the standard guaranteed by the next process, the wording of the process standard should be marked on the picture.

The deformation of the precision casting mold is caused by the casting stress, and the shape and standard of the casting do not match the drawing. The reason is simply that the thickness difference between the upper and lower sides is large, and the temperature difference formed during cooling is also large; the thin one cools quickly, and the thicker one shortens faster, forming the twists and turns shown by the imaginary line of the precision casting mold.

Conclusion

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