Consequences and repair methods of scratches on the surface of the inner hole of the hydraulic cylin

The bad consequences of the scratches on the surface of the inner hole of the hydraulic cylinder and the quick repair method

　　The material scraps extruded from the scratched groove will be embedded in the seal. During operation, while damaging the working part of the seal, it may cause a new scratch in the area.

　　 Deteriorate the surface roughness of the inner wall of the cylinder, increase friction, and easily cause creeping.

　　 aggravates the internal leakage of the hydraulic cylinder and reduces the working efficiency of the hydraulic cylinder. The main causes of scratches on the bore surface of the cylinder are as follows.

　　Scars caused when assembling hydraulic cylinders

When the assembly is mixed with foreign matter to cause scars, all parts of the hydraulic cylinder must be fully deburred and cleaned before the general assembly. When the parts are installed with burrs or dirt, foreign matter is easy to be embedded into the cylinder wall due to the "unusual strength" and the weight of the parts. Surface, causing scars.

Scars in the installation parts When installing the hydraulic cylinder, the pistons and cylinder heads and other parts have large masses, large dimensions, and large inertia. Even if the lifting equipment is used for auxiliary installation, due to the small clearance of the specified fit, no matter what, you will not put it hard. Therefore, when the end of the piston or the boss of the cylinder head hits the inner surface of the cylinder wall, it is easy to cause scars. The method to solve this problem: For small products with large quantities and large batches, special assembly guide tools are used when installing; for heavy, thick, large large and medium hydraulic cylinders, only careful and careful operation can try to avoid them.

　　The scars caused by the contact of the measuring instrument are usually used to measure the inner diameter of the cylinder with an inner diameter dial indicator. The measuring contact is inserted into the bore wall of the cylinder while rubbing, and the measuring contact is mostly made of high hardness and wear-resistant hard alloy. Generally speaking, the thin and elongated scratches caused by the measurement are slight and do not affect the running accuracy. However, if the measuring rod head size is not adjusted properly, the measuring contact is hardly embedded, which will cause more severe scratches. The countermeasure to solve this problem is to first measure the length of the adjusted measuring head. In addition, use a piece of paper tape with only holes in the measuring position and stick it on the inner surface of the cylinder wall, that is, the above-mentioned shape scratches will not be produced. . Minor scratches caused by measurement can generally be wiped off with the reverse side of an old emery cloth.