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高锰钢铸件大部份是非加工件,因此对尺寸公差和表面质量要求较高,不能忽视。现将我厂在工艺操作等方面的做法介绍如下: 一、木模工艺及其检验 (1)我厂生产的高锰钢铸件大部分采用型板造型(数量在80只以上),型板的优点是:产量高,成本低,尺寸正确,表面光洁,对其使用面一律朝下,这样不但质量有保证,而且表面又光洁。高锰钢缩尺我厂均按2.5％计算。 (2)对安装孔完全采用“+”公差,孔与孔之间间距不变,按2.5％放收缩率,如铲齿两孔中心线不变,孔眼放大2毫米。φ3.6~(+3 -1)
Most of high manganese steel castings are non-machined parts, so the dimensional tolerance and surface quality requirements can not be ignored. Now I plant operations and other aspects of the practices are as follows: First, the wood mold technology and its inspection (1) I plant the majority of high manganese steel castings using the template shape (the number of more than 80), the template The advantages are: high yield, low cost, correct size, smooth surface, the use of its face down, so that not only the quality assurance, and the surface is bright and clean. High manganese steel scale I plant are calculated according to 2.5%. (2) The installation hole is completely “+” tolerance, the spacing between holes is constant, put the shrinkage ratio at 2.5%. If the center line of the two holes of the shovel tooth is unchanged, the eyelet enlarges 2mm. φ3.6 to (+3 -1)