Application of beryllium copper in plastic molds
1. Sufficient hardness and strength: After many tests, engineers can find out and master the best hardening conditions of beryllium copper alloy precipitation and the best working conditions as well as the mass characteristics of beryllium copper (this is The beryllium copper alloy is a prelude to the application of the official product in the market); before the beryllium copper material is applied to the plastic mold, it needs to go through many rounds of tests to finally determine the best physical properties and chemical composition that meet the manufacturing and processing; Proved by practice – the hardness of beryllium copper can reach the hardness, strength, high thermal conductivity required for plastic mold manufacturing at HRC36-42, easy and convenient machining, long service life of mold and saving development and production cycle, etc. .
2. Good thermal conductivity: The thermal conductivity of beryllium copper material is conducive to controlling the temperature of plastic processing molds, making it easier to control the molding cycle, and at the same time ensuring the uniformity of mold wall temperature; if compared with steel molds, beryllium copper molding The cycle is much smaller, and the average temperature of the mold can be reduced by about 20%. When the difference between the average release temperature and the average wall temperature of the mold is small (for example, when the mold parts are not easy to be cooled), beryllium copper mold material is used for cooling. Time can be reduced by 40%. The mold wall temperature is only reduced by 15%; the above characteristics of beryllium copper mold material will bring several benefits to mold manufacturers using this material: shorten the molding cycle and increase productivity; mold wall temperature uniformity is good, improving the quality of drawn products ; The mold structure is simplified because the cooling pipes are reduced; The temperature of the material can be increased, thereby reducing the wall thickness of the product and reducing the cost of the product.
3. Long service life of the mold: Budgeting the cost of the mold and the continuity of production, the expected service life of the mold is very important for the manufacturer. When the strength and hardness of beryllium copper meet the requirements, beryllium copper will affect the mold temperature. The insensitivity of stress can greatly improve the service life of the mold. Before determining the use of beryllium copper mold materials, the yield strength, elastic modulus, thermal conductivity and temperature expansion coefficient of beryllium copper should also be considered. The resistance of beryllium copper to thermal stress is much stronger than that of die steel. From this point of view, the service life of beryllium copper is remarkable!
4. High heat penetration rate: In addition to the thermal conductivity performance, the heat penetration rate of the mold material is also very important for plastic products. On the mold using beryllium copper, overheating traces can be eliminated. If the heat penetration rate is low, The higher the contact temperature in the distal region of the mold wall, the greater the temperature difference in the mold, which in extreme cases can cause regional temperature changes to extend from sink marks on one end of the plastic to overheated product marks on the other end .
5. Excellent surface quality: Beryllium copper is very suitable for surface finishing, can be directly electroplated, and has very good adhesion performance, and beryllium copper is also easy to polish.