紧固件采购？紧固件的韧性大,热强度高,砂轮磨粒的切削刃具有比较大的负前角,磨削过程中的磨屑也不容易被切离,切削阻力大,挤压、摩擦剧烈。单位面积的磨削力很大,磨削温度可达1000℃~1500℃。同时,在高温高压的作用下,磨屑一般比较容易粘附在砂轮上,填满了磨粒间的空隙,也会使磨粒失去切削作用。紧固件的类型不同,从而产生砂轮堵塞的情况也就不相同,如磨削耐浓硝酸紧固件及耐热紧固件,粘附、堵塞现象比1Cr18NiTi严重,而1Cr13、2Cr13等马氏体紧固件就比较轻。
The thermal conductivity of the fastener is small, the high temperature during grinding is not easy to be derived, and the surface of the workpiece is prone to burns and annealing. The depth of the annealing layer can sometimes reach 0.01~0.02 mm.Severe extrusion deformation occurs during the grinding process, resulting in work hardening of the ground surface, especially when grinding austenitic fasteners, because the austenite structure is not stable enough, it is easy to produce martensite structure after grinding, making the surface Hardening is severe.
The coefficient of linear expansion of fasteners is large, and it is easy to deform under the action of grinding heat, and its size is difficult to control.Especially for thin-walled and slender parts, this phenomenon is more serious.
Fastener procurement?Most types of fasteners cannot be magnetized. During surface grinding, only mechanical clamping or special fixtures can be used to clamp the workpiece. The side of the workpiece is used to clamp the workpiece, which will cause deformation and cause shape or size errors. prominent.At the same time, it can also cause chattering during grinding and scaly ripples appear.