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压铸铝合金件的成本中有25～60％花在工艺装备上,因此提高压铸模的寿命十分重要。为了提高模具的寿命需要确定其工作和检修的最佳技术组织条件。本文研究的模具,多数用在仪表行业的盒形铸件及平板形铸件,重0.1～6kg,壁厚1.5～8mm,投影面积1000cm~2以下,浇注温度580～650℃,压射速度及比压分别为2～3.5m/s和1200kgf/cm~2以下,浇注前模具温度250～280℃。模具衬块和大型芯的主要工作缺陷是裂缝。第一阶段的研究目标是确定两次定期预检间的间隔时间。经500、1000、1500、2000次浇注试验表明,浇注800～1500次后进行一次预检是较妥的,大于1500次,不会使铸型寿命有所增加。预检的项目包括:检查、消除小缺陷、更换易损件。随着成型表面的面积的增大,预检效果就更明显。但到S=450～500cm~2时,效果就不再提高了。
The cost of die-casting aluminum parts 25 to 60% spent on process equipment, so to improve the life of die-casting mold is very important. In order to improve the life of the mold need to determine the best technical organization of its work and overhaul. The molds studied in this paper are mostly used in box-shaped castings and flat-shaped castings in the instrumentation industry, weighing 0.1-6kg, wall thickness 1.5-8mm, projection area 1000cm 2 or less, pouring temperature 580-650 ℃, injection speed and specific pressure Respectively, 2 ~ 3.5m / s and 1200kgf / cm ~ 2, the mold temperature before casting 250 ~ 280 ℃. The main working flaw of mold inserts and large cores is cracks. The first phase of the study was to determine the interval between two regular pre-screening sessions. After 500,1000,1500,2000 times pouring test shows that after pouring 800 ~ 1500 times a pre-inspection is better, more than 1500 times, will not increase the life of the mold. Pre-inspection items include: inspection, eliminate small defects, replacement of wearing parts. With the molding surface area increases, the pre-inspection effect is even more obvious. But to S = 450 ~ 500cm ~ 2, the effect will no longer increase.