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随着机械工业的飞速发展,对机床性能及质量的要求正不断提高。同样,机床铸铁件的质量也需要提高,而采用常温自硬呋喃树脂砂工艺生产机床铸铁件,则能满足机床工业发展的需要。现将我厂使用树脂砂的经验介绍如下。一、常温自硬呋喃树脂砂原材料的选择1.原砂(1)要有良好的高温德定性,因此,要考虑原砂矿物组成及化学成分。一般铸铁件要求原砂石英含量大于85％、SiO_2含量大于88％。(2)原砂表面的吸附水能增加砂粒表面与有机粘结剂之间的表面张力,使有机粘结剂不易润湿砂粒,附着力减弱,导致型砂强度降低,并延缓
With the rapid development of machinery industry, the requirements of machine tool performance and quality are constantly increasing. Similarly, the quality of cast iron machine tools also need to be improved, and the use of room temperature hard furan resin sand production process of machine tool cast iron, you can meet the needs of machine tool industry. Now I plant experience using resin sand introduced below. First, the room temperature choice of raw materials, raw materials, furan resin 1. The original sand (1) to have a good high-temperature German qualitative, therefore, to consider the composition of the original sand and chemical composition. General requirements of the original cast iron sand content greater than 85%, SiO2 content greater than 88%. (2) Adsorption of water on the surface of the original sand can increase the surface tension between the surface of the sand and the organic binder, so that the organic binder can not moisten the sand, and the adhesion is weakened, so that the strength of the sand is reduced and retarded