① Scratch transfer on the sliding surface of the piston Before the piston is installed, there are scratches on the sliding surface, which are not treated and installed intact. These scratches will in turn scratch the inner surface of the cylinder wall. Therefore, these scars must be fully trimmed before installation.
② The sintering phenomenon caused by the excessive pressure on the sliding surface of the piston will cause the piston to tilt due to the self-weight of the piston rod, resulting in a different phenomenon, or the pressure on the sliding surface of the piston will rise due to the action of lateral load, which will cause the sintering phenomenon. When designing the hydraulic cylinder, its working conditions must be studied, and sufficient attention must be paid to the length and clearance of the piston and bushing.
③ Peeling of the hard chrome plating on the inner surface of the cylinder It is generally believed that the reasons for the peeling of the hard chrome plating are as follows.
ib. Lub plating txheej tsis zoo sib txuas. Lub ntsiab yog vim li cas rau cov neeg pluag adhesion ntawm lub electroplating txheej yog: ua ntej electroplating, degreasing thiab degreasing kev kho mob ntawm qhov chaw yog tsis txaus; Kev kho qhov chaw ua haujlwm ntawm qhov chaw tsis zoo, thiab oxide zaj duab xis txheej tsis raug tshem tawm.
b. Cov tawv tawv yog hnav. Kev hnav ntawm cov txheej txheej electroplated nyuaj chromium feem ntau yog tshwm sim los ntawm kev sib tsoo ntawm kev sib txhuam hlau hmoov ntawm lub piston. Thaum muaj noo noo nyob rau hauv nruab nrab, hnav yog sai dua. Qhov corrosion tshwm sim los ntawm kev sib cuag muaj peev xwm sib txawv ntawm cov hlau tsuas yog tshwm sim nyob rau hauv qhov chaw uas cov piston tiv tauj, thiab corrosion tshwm sim nyob rau hauv daim ntawv ntawm cov ntsiab lus. Raws li saum toj no, lub xub ntiag ntawm noo noo nyob rau hauv nruab nrab yuav txhawb txoj kev loj hlob ntawm corrosion. Piv nrog rau castings, kev sib cuag muaj peev xwm sib txawv ntawm tooj liab alloys yog siab dua, yog li qhov corrosion degree ntawm tooj liab alloys loj dua.
c. Corrosion vim kev sib cuag muaj peev xwm sib txawv. Kev sib cuag muaj peev xwm sib txawv corrosion tsis yooj yim tshwm sim rau hydraulic thooj voos kheej kheej uas khiav mus ntev; nws yog ib qho txhaum cai rau lub tog raj kheej hydraulic uas tsis siv rau lub sijhawm ntev.
④ Damage to the piston ring The piston ring is damaged during operation, and its fragments are caught in the sliding part of the piston, causing scratches.
⑤ The material of the sliding part of the piston is sintered and cast piston, which will cause sintering phenomenon when it bears a large lateral load. In this case, the sliding part of the piston should be made of copper alloy or welded with such material.
