Reason for cylinder pulling:

The reasons for cylinder pulling are very complex, with design factors such as material selection, determination of gap size, appropriateness of device installation, reasonable structural layout, surface roughness, and perfect lubrication and cooling arrangements. From a management perspective, it may be caused by the following reasons:

Poor cooling:

Poor cooling will result in excessively high temperature of the cylinder and piston, and poor lubrication; Poor cooling can cause excessive expansion and deformation of the piston and cylinder liner due to overheating, loss of the original normal clearance, and cylinder pulling. The reasons for poor cooling include insufficient discharge pressure of the cooling water pump, insufficient or interrupted water supply; Rust or dirt in the cooling water chamber; Water contains bubbles that accumulate in the cooling chamber but are not released, resulting in air resistance; The water quality is too dirty and the water temperature is too high.

Cylinder liners are divided into two categories: dry cylinder liners and wet cylinder liners. The cylinder liner that does not come into contact with cooling water on the back is called a dry cylinder liner, while the cylinder liner that comes into contact with cooling water on the back is a wet cylinder liner. The dry cylinder liner has a thin thickness, simple structure, and convenient processing. The wet cylinder liner is directly in contact with cooling water, which is beneficial for engine cooling and lightweight.

Processing process flow

Cylinder barrel: cutting - rough turning - heat treatment (quenching and tempering) - turning (flat head chamfering) - rough pushing inner hole - rolling inner hole - turning (outer circle opening socket) - car inner hole sealing - welding cylinder bottom - car (outer circle) - internal galvanizing or chromium plating as needed