油缸、活柱筒是煤矿用支护产品中的重要零件，其制造过程中热处理的质量直接关系到整个支护产品的性能及成本，因此许多生产支护产品的厂家都把热处理的工序放在重要的位置，其热处理的工艺也是多种多样的。但是大多数厂家都以中频炉淬火加淬火机床校直再加中频回火炉回火组成 Oil cylinder and piston column are important parts in coal mine support products. The quality of heat treatment in the manufacturing process is directly related to the performance and cost of the whole support product. Therefore, many manufacturers of support products place the heat treatment process on Important location, the heat treatment process is also varied. However, most of the manufacturers are quenching and quenching medium frequency furnace straightening machine plus tempering IF tempering furnace composition