A valve grinding machine is a common method of light finishing processing its sealing surface in the valve manufacturing process.

The importance of valve lapping machine

Grinding with a valve lapping machine can make the valve sealing surface obtain high dimensional accuracy, geometric shape accuracy, and surface roughness. After grinding the valve sealing surface can usually achieve the dimensional accuracy of 0.001mm ~ 0.003mm; geometric shape accuracy (such as unevenness) of 0.001mm. the grinding project, the research tool, and the sealing surface is well fit together, the research tool along the fit surface for complex grinding motion. Abrasive is placed between the grinding tool and the sealing surface. When the grinding tool moves relative to the sealing surface, some of the abrasive particles in the grinding tool slide or roll between the grinding machine and the sealing surface, cutting off a very thin layer of metal on the sealing surface. The convex peaks on the sealing surface are first ground away and then gradually reach the required geometry.

Grinding is not only a mechanical process of abrasives on the metal but also a chemical process. The grease in the abrasive accelerates the grinding process by forming an oxide film on the machined surface.

What is the purpose of valve grinding?

A valve grind (commonly referred to as a valve job or valve lap) can be crucial for proper functioning valves/seals. It is the process of smoothing out the engine valves so that they are effectively able to seal in the valve seat in the cylinder head to completely seal the engine’s combustion chamber.

Why is grinding so important in modern production?

As you can see, industrial grinding machines are an important part of industries today because they allow companies to extract minerals, reduce the particulate size of materials, and create nanostructure materials mechanically with high precision and at a low cost.

Grinding method

1. first with grinding plane shut-off valve seat grinding way grinding valve seat plane. Use all resin imported coarse abrasive cloth. Until the sealed bevel on the scouring and other groove marks disappear nearly disappeared.

2. Then use the same angle size - the same taper grinding head. Use 120-240# SiC sandpaper, apply light pressure and grind slowly until observed with reflection. The width of the sealed bevel is about 5-10% of the diameter of the passage is appropriate. (For tapered valves with DN>5O or more, the seal bevel width should be between 2.5-4.0mm. Under the same conditions, the larger the diameter, the width should be increased. But the wider the shorter the service life, the easier it is to close the extrusion of solid particles and damage).

3. after grinding the valve seat, the valve head according to the same angle on the lathe finishing. Coaxial should be less than e0.015, roundness less than ○0.005, to avoid an oval error. The final process can be polished with 400# SiC sandpaper. In general, the valve seat, the valve head in the centering clamping suitable and stable conditions need to be processed according to the valve seat bore site suitable centering sleeve before the study. It is recommended to use 800-1000# grit grinding paste. To study out of the ring bright-line shall prevail. Do not appear with a swing.

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