The piston rod is a connecting part that supports the work of the piston. Most of them are used in the cylinder and cylinder movement executing parts, and are a moving part with frequent movement and high technical requirements. Taking a hydraulic cylinder as an example, it consists of a cylinder, a piston rod (cylinder rod), a piston, and an end cover.
If the piston rod of the gas-liquid booster cylinder is pulled after work, if it is not treated in time, it will affect the use of the product, and if it is serious, the hydraulic cylinder will not work. So how do we fix it? The lighter stretch marks are repaired by local grinding and polishing; the heavier pull marks are repaired by welding and manual grinding.
The formation of the pull marks: After the disintegration of the gas-liquid booster cylinder, it was found that a piston rod of the luffing cylinder was severely strained, and the pull marks were arranged side by side. The main cause of the piston rod strain is: after the dust-proof ring is embrittled and lost in a block form, not only the dust-proof effect is lost, but also a lot of dust and magazines are accumulated there, so that the piston rod is directly ground with impurities, resulting in a piston. The rod was pulled and the scratches scraped the rubber seal assembly of the cylinder port, causing serious leakage of the hydraulic cylinder.
Repair requirements: the filler and the base metal must be combined firmly and smoothly; the seasoning must be durable and easy to process by hand; manual machining must ensure that the piston rod diameter error is less than 0.06mm. After analysis, it was decided that the filler used was J422 electrode. Because the acid electrode is not sensitive to rust, oil and moisture, it is not easy to produce hydrogenation holes; the process is good and easy to operate; the weld is beautifully formed; the material hardness is moderate, easy to process by hand; the arc is stable, the penetration is large, and the base metal The combination is firm.