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压铸模合型后,压射室内的气体体积远大于型腔和浇道,设法排除此处的气体对减少铸件的气孔很关键,对于卧式压铸机采用办法如下。 在压射室顶部开设宽7mm排气通槽和宽16mm排气道,并在相关件〈机床缸套〉开设宽16mm深4mm排气出口上下两个。当合金液浇入,压射活塞向前推进时,合金液尚未达到压射室顶部,所以排气通槽只能排不能跑出合金液;压射活塞继续前进,当合金液达到压射室顶部时,前进的活塞已经堵住了排气槽,所以合金液仍不能跑出。如果操作者浇料超过保险余量,会有一些合金液
After the die-casting mold is shaped, the volume of gas in the injection chamber is much larger than the cavity and the runner. It is very important to eliminate the gas here to reduce the porosity of the castings. The following methods are used for the horizontal die-casting machine. In the top of the injection chamber to open a wide 7mm exhaust through slot and 16mm wide exhaust path, and in the relevant pieces of wide 16mm deep 4mm exhaust outlet up and down two. When the alloy liquid is poured and the injection piston advances, the alloy liquid has not reached the top of the injection chamber. Therefore, the discharge passage can only discharge the alloy liquid and the injection piston can move forward. When the alloy liquid reaches the injection chamber At the top, the forward piston has blocked the exhaust groove, so the alloy liquid still can not run out. If the operator pour over the insurance margin, there will be some alloy liquid