Mould and method for preparation high-pressure switch cast aluminium can
A high-voltage switch and mold technology, applied in the field of aluminum alloy casting, mold, and high-voltage switch closed SF6 metal cans, can solve the problems of reduced pressure resistance, low qualification rate, poor surface quality, etc., and achieve good corrosion resistance and pressure resistance. , The effect of convenient parameter control and yield increase
Inactive Publication Date: 2007-06-27
新东北电气(沈阳)高压开关有限公司 +1
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[0002] At present, most of the methods for producing closed SF6 metal tanks for high-voltage switches adopt the method of welding steel plates commonly used in Japan. The tanks produced by this method are large in size, high in quality, poor in corrosion resistance, high in cost, and complicated in production procedures. The size and surface quality are not easy to guarantee, and the yield is low; in order to solve the above problems, a new method of integral casting of aluminum alloy has emerged in recent years, but most of them use conventional sand casting methods, resulting in poor surface quality and non-compact structure. There are many pores and slag pores, the pressure resistance is reduced, the air tightness is poor, the production efficiency is low, the pass rate is low, the production cost is high, and it is difficult to meet the tensile strength of 220-300kg / cm 2 , elongation 1~4%, withstand pressure > 4.0MPa, air leakage rate 2 s and surface finish ≥ Re150μm and other technical indicators
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[0013] The mold for preparing switch cast aluminum cans is made of metal materials, and its structure is shown in Figures 2 and 3. The mold shell is provided with an inlet port 4 connected with the crucible liquid riser, connected with the port and provided with a sprue 3 at its lower part, and a cap opening 5 is provided at the small flange at the upper end of the mold, and the cap port 5 is connected with the cavity Connected; the sand core 8 is provided with a runner 6 communicating with the sprue 3 at the left and right ends, communicating with the runner 6, and an annular inner gate 2 is arranged along the direction of the runner 6. Considering that the casting reaches a certain density and the related metallographic crystallization process has a positive effect on product quality, the casting method and steps are shown in Figure 1.
[0014] The operation steps of the casting method are shown in Figure 4, which are divided into liquid raising stage, mold filling stage, cr...
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Abstract
A technology for preparing the cast aluminium tank for high-voltage switch features the low-pressure casting with metallic mould is used, and the pressure for filling molten metal in mould is raised at 5000-8000 KPa step-by-step. Said metal mould has the guide inlet communicated with liquid lifting tube, straight running channel, raise head, and sand core with transverse running channel and internal pouring head.
Description
technical field [0001] The invention relates to a metal forming method, in particular to a method for sealing an SF6 metal tank with a high-voltage switch, adopting an aluminum alloy casting method and a mold adopting the method. Background technique [0002] At present, most of the methods for producing closed SF6 metal tanks for high-voltage switches adopt the method of welding steel plates commonly used in Japan. The tanks produced by this method are large in size, high in quality, poor in corrosion resistance, high in cost, and complicated in production procedures. The size and surface quality are not easy to guarantee, and the production yield is low; in order to solve the above problems, a new method of integral casting of aluminum alloy has appeared in recent years, but most of them use the conventional sand casting method, resulting in poor surface quality and non-compact structure. There are many pores and slag pores, the pressure resistance is reduced, the air tigh...
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IPC IPC(8): B22C9/02B22D18/04B22D21/04
Inventor 李荣德侯峻岭陆启为于海朋
Owner 新东北电气(沈阳)高压开关有限公司