树脂砂加热硬化工艺的特点是所用的硬化剂在常温下不起作用或作用甚敏,加热到一定温度以后立即作用使树脂发生硬化反应。这种硬化剂我们称之为潜硬化剂。 常用的加热硬化工艺有以下三种。 一、壳型(壳芯)工艺 此工艺是德国人克朗宁在第二次世界大战期间发明的,战后为美国占领军技术服务部的研究人员所发现,并作为一项战利成果而公开发表,给铸造 Resin sand heating and hardening process is characterized by the use of hardeners at room temperature does not work or role very sensitive to a certain temperature immediately after heating the resin hardening reaction occurs. This type of hardener we call the latent hardener. The commonly used heat hardening process has the following three kinds. First, the shell (shell core) process This process was invented by the German Kronen during World War II, the post-war for the United States occupation forces technical services department researchers found and published as a result of the war Posted, to the casting