汽车发动机气缸体是铸造生产中最复杂的铸件之一,它要求很高的制造质量和很精确的形状和尺寸。这种铸件不应有缺陷,而且铸件材料要具有最佳的金相组织。 一些外国公司是通过对所有缸体铸件进行液压和气压试验(在机械加工的前后)的方法来保证其制造质量,但最重要的是,要研究和清除产生各种缺陷和缺陷区的原因。 美国公司所进行的研究表明,缸体的主要缺陷是枝晶间缩松、气孔、筛状氮气孔和氢气孔。 Automotive engine block is one of the most complex castings in foundry production, requiring high manufacturing quality and a very precise shape and size. This casting should not be flawed, and the casting material to have the best metallurgical structure. Some foreign companies guarantee the quality of their manufacture by hydraulically and pneumatically testing all cylinder castings (before and after machining), but most importantly, investigate and eliminate the causes of various defects and defective areas. Research conducted by American companies shows that the main defects of the cylinder body are dendrites, pores, sieve-like nitrogen pores and hydrogen pores.