The method of repair of the screw:
1、broken screw according to the actual internal diameter of the barrel to consider,according to the normal clearance barrel outside diameter of the screw gives new manufacturing deviations .
2、reduced diameter threaded screw wear surface after treatment,thermal spraying wear-resistant alloy,and then by grinding to size.This method is generally a professional spray processing plant repair,the cost is still relatively low.
3、the threaded portion of the screw in wear resistant alloys.According to the degree of wear surfacing screw 1~2mm thick,then screw grinding to size.This wear-resistant alloy of C,Cr,Vi,Co,W and B,such as material composition,increasing the screw anti-wear and corrosion resistance capabilities.The high cost of professional welding plant for such processing,in addition to the special requirements of the screw,seldom used .
4、can also be used to repair the screw method of hard chrome plated,chrome is also wear-and corrosion-resistant metal,but hard chromium layer is relatively easy to fall off.
Repair barrel as follows:
Inner surface of the barrel higher than the hardness of the screw,it is more damaging than the screw late.Scrapped diameter is the diameter of the barrel due to increased wear and tear of time.Its restoration follows:
1、due to increased wear of the cylinder diameter,if there is a certain time of the nitrided layer can be directly put the barrel hole boring,grinding to a new diameter size,and then click the preparation of a new screw diameter.
2、the inner diameter of the barrel again after finishing machining cast alloy thickness between 1~2mm,then finish to size.
3 、plasticizing section of the barrel wear faster under normal circumstances can be paragraph(take 5~7D long)was boring dressing,adding a nitriding steel bushings,screw diameter bore diameter of the light,stay in normal with the gap,preparation for processing.