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首页 > 新闻咨讯 >   覆膜砂制芯工艺

覆膜砂制芯工艺

发布时间:2020-01-11
1.制作实体芯从理论上讲,覆膜砂几乎可以生产所有类型,尤其是高精度铸件的实体芯。采用湿态覆膜砂时,可直接利用热芯盒设备和工装制芯,而无需对原有设备和工装做任何改变。采用干态覆膜砂时,由于其流动性好,需对芯盒的排气方式、射嘴及芯盒密封进行特殊处理。可利用安息角原理(覆膜砂的安息角约30o ) ,解决射砂后排气时覆膜砂进入射腔和不射砂时覆膜砂自动下落等问题。目前,采用干态覆膜砂热芯盒制芯工艺的厂家较多。
1. making solid cores, theoretically speaking, coated sand can produce almost all types, especially the solid core of high-precision castings. When wet coated sand is used, the hot core box equipment and tooling can be made directly without any changes to the original equipment and tooling. When dry sand coated sand is used, due to its good fluidity, the exhaust mode of the core box, the sealing of the nozzle and the core box need to be specially treated. The principle of the rest angle (the rest angle of the coated sand is about 30o) can be used to solve the problem of automatic falling out of the coated sand when the coated sand enters the cavity and does not fire. At present, there are many manufacturers of dry coated sand core boxes.
2.制作壳型用覆膜砂制作壳型,常见于浇注凸轮轴等轴类零件或刹车片等盘类零件及一些表面要求高的阀类零件等。其相关参数如下:砂铁比1:(1.5)~4;拔模斜度0.5°~1°等,壳型壁厚8~12mm。
2. the shell type made of film coated sand made of shell type is common in such parts as shafts of camshaft, such as shaft parts or brake discs, and some valve parts with high surface requirements. The relevant parameters are as follows: sand iron ratio 1: (1.5) to 4; draft angle 0.5 to 1 degrees, and shell thickness 8 ~ 12mm.
均匀的壳型壁厚可以减少覆膜砂用量,获得均匀的铸件组织。用覆膜砂制作壳型,可采用固定式射芯机或翻转式射芯机,前者可用干态覆膜砂或湿态覆膜砂,后者只能选用干态覆膜砂。
Uniform shell thickness can reduce the amount of coated sand and obtain uniform casting structure. Using film coated sand to make shell type, a fixed ejection machine or a flip core machine can be used, the former can be dry state coated sand or wet coated sand, the latter can only choose dry coated sand.
3.制作壳芯用覆膜砂制作壳芯通常采用摇摆式壳芯机(如K85、K87、K89等),通过射砂、结壳、提出余砂、固化、脱膜等环节完成制芯过程。
3. the shell core used in making shell core is usually made of swing shell core (such as K85, K87, K89, etc.), and the core process is completed by shooting sand, crusting, putting forward sand, curing and removing film.
为了确保壳芯的品质,除了要保证覆膜砂的品质之外,还必须根据每个砂芯的具体情况来选择合理的制芯工艺。芯盒温度 芯盒温度是影响壳层厚度的主要因素之一,一般控制在230-300℃,并根据下列原则选定:
In order to ensure the quality of the shell core, in addition to ensuring the quality of the coated sand, it is necessary to choose a reasonable core making process according to the specific conditions of each sand core. Core box temperature core box temperature is one of the main factors affecting shell thickness, generally controlled at 230-300 C, and selected according to the following principles:
①保证覆膜砂上的树脂软化及固化所需的足够热量;
1. Ensure enough heat for resin softening and curing on resin coated sand.
②保证形成需要的壳厚且壳芯表面不焦化;
Second, ensure the formation of the required shell thickness and the surface of the shell core is not coking.
当前地址:http://www.pyshexinji.com/news/765/  作者:鹏宇射芯机
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