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轧机的辊系在换辊前可以预安装并调整好，轧机生产厂家，轧机停车后只需较短时间即可换上新辊系。而新辊系经少量试轧后即能轧出合格产品。因此这种轧机可调性能好，成材率高。

短应力线轧机可制成二辊式、三辊式或四辊式多种形式的轧机。在型钢、线材和板带钢生产中部有应用。

The roll system of rolling mill can be pre installed and adjusted before changing the roll. After the rolling mill ， it only needs a short time to replace the new roll system. The new roll system can be rolled out of the qualified product after a small amount of test rolling. Therefore， this kind of rolling mill has good adjustable performance and high yield.  

The short stress line mill can be made into two - roll， three - roll， or four - roll type rolling mills. It is applied in the middle part of steel， wire and strip steel.

半闭口式机架是机架与机架盖之间采用斜楔连接的一种机架。这种机架兼有开口式机架和闭口式机架的优点，装卸、换辊方便，450轧机报价，制造容易，轧机，并有较高的刚度，故一般大中型的型钢轧机都采用这种形式的机架。

A semi closed frame is a frame with a wedge between the frame and the frame cover. The rack has the advantages of open frame and closed frame. It has the advantages of loading and unloading，轧机采购， easy roll changing， easy manufacture and high rigidity. Therefore， a large and medium-sized steel mill is adopted in this form.