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我厂DD28电度表中用的磁钢采用熔模铸造法制造,其牌号是铝镍9.6。经大批生产考核证明,我厂电表磁钢的工艺技术是可行的。现将其工艺简介如下: 一、设计铸件图 设计铸件图时,①考虑到磁钢是一种硬而脆的材料(Rc45～50),因此,只在产品要求7的端面上留有Q.5毫米的磨削余量,其余部位均不留加工余量。②为提高制模生产率,同时利用磁钢硬而脆的特点采用自带易割内浇口。③内浇口位置应尽量避开工作使用面。磁钢还要求结晶结构和磁结构。一般内浇口位置应该尽量使结晶方向平行于工作使用定向。④为防止铸件产生缩松、缩孔、开裂等缺陷,内浇口应设置在铸件的厚壁部位,以利铸件顺序凝
DD28 meters in our factory used in the use of investment casting magnet, its grade is AlNi 9.6. After a large number of production tests proved that my factory meter magnetic technology is feasible. Now the process is as follows: First, the design castings Figure casting diagram, ① Considering the magnet is a hard and brittle material (Rc45 ~ 50), therefore, only the product requirements of the end of the left Q. 5 mm grinding allowance, the remaining parts do not leave machining allowance. ② In order to improve the mold making productivity, at the same time, take advantage of the hard and brittle magnetic steel with its own easy to cut within the gate. ③ gate position should be avoided as far as possible the use of work surface. Magnets also require crystalline structure and magnetic structure. General gate location should try to make the crystal direction parallel to the use of work orientation. ④ To prevent casting shrinkage, shrinkage, cracking and other defects, the gate should be set in the thick parts of the casting, to facilitate the casting sequence of condensate