论文部分内容阅读
1 引言我厂是矿山设备的备品配件专业生产的厂家。为了扩大生产和提高铸件的产品质量,于九○年开始逐步建成一条年产千吨铸钢件的酯硬化水玻璃生产线。酯硬化水玻璃砂与树脂自硬砂同属目前世界上最先进的造型工艺,两者操作方法基本相同,混合料在模内硬化后脱模,可以不经烘干进行浇注,这种砂流动性很好,一般铸型无需进行专门紧实,直接从连续式混砂机出砂口落到砂箱内,砂层在落下的砂粒冲击作用下得到紧实。但对于一些复杂件及高大件,砂型起模后放数十小时有时会发现砂型在砂箱内有下沉现象,造成这种现象有原因有:一是砂型硬化强度
1 Introduction I plant is a mine equipment spare parts specializing in the production of the manufacturers. In order to expand production and improve the quality of the castings, an esterified water glass production line that annually produces thousands of tons of steel castings began to be built in 1990. Ester-hardened sodium silicate sand and resin self-hardening sand belong to the world’s most advanced modeling techniques, the two methods are basically the same, the mixture is hardened in the mold stripping, you can pour without drying, the sand fluidity Very good, the general mold without special compaction, sand directly from the sand out of sand falling sand box, the sand layer in the sand under the impact of the impact of the compact. However, for some complex parts and tall pieces, sand mold release dozens of hours after the release sometimes found in sand box sand phenomenon, resulting in this phenomenon for some reasons: First, the hardening strength of the sand