Analysis of Influencing Factors of Die Casting Production Process
Thu Jun 08 08:55:21 CST 2023
1. Preheat the mold before production, so that the toughness and hardness of the mold are excellent, which has a great impact on the life of the mold. Production is carried out without preheating. When the high-temperature molten metal fills the cavity, the surface of the cavity is subjected to severe thermal shock, which causes the temperature gradient between the inner and outer layers of the cavity to increase, which may easily cause surface cracks or even cracks. The preheating temperature of the die-casting mold is selected according to the type of alloy used.
2. During the production process, the temperature of the mold gradually increases. When the temperature is overheated, it will cause defects in the casting, sticking of the mold or failure of the movable mechanism. When lowering the mold temperature, it is necessary to pay attention to the appropriate cooling temperature. The mold coolant needs to be heated to 50°C before use, which can reduce thermal cracking. Generally, it is not allowed to use less than 20°C. Generally, molds should be equipped with cooling channels, and an appropriate amount of cooling water should be passed in to control the temperature change in the mold production process. When conditions permit, it is recommended to use a mold temperature control system to keep the mold within an appropriate working temperature range during the production process, and the life of the mold can be greatly extended.
3. Whether the lubrication of the guide slide part of the mold, the selection and use of cavity and core coatings are appropriate will also have a great impact on the life of the mold. Mold lubricants must be firmly attached to the surface of the mold cavity to avoid direct metal contact with the mold.
4. Surface cleaning: Aluminum slag and release agent residues accumulated on the mold core, parting surface, and inner cavity should be removed in time during production. Maintain the correct working position and movement position of the mold parts.
5. Stress relief: During the die-casting process, the die-casting mold is repeatedly washed by high-temperature and high-pressure molten metal, and the alternating heat and cold are intense, which will continuously generate stress, and the internally accumulated stress will become larger and larger. When the stress exceeds the strength limit of the material When the mold surface is cracked. If these stresses are not removed, fatigue cracks will be the first to be caused to a certain extent. Therefore, during the use of the mold, pay attention to regular stress relief, which can prolong the life of the mold.