Why Valve Grinding Machine Is Necessary?

Dec. 09,

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A valve grinding machine is an essential tool used for refining the sealing surface in the manufacturing of valves.

The Significance of a Valve Lapping Machine

Utilizing a valve lapping machine allows for the achievement of exceptional dimensional accuracy, geometric shape precision, and surface roughness on valve sealing surfaces. Typically, after grinding, the dimensional accuracy can reach between 0.001mm to 0.003mm, while the geometric accuracy can often reach 0.001mm. The grinding process, aided by a specifically designed research tool, aligns perfectly with the sealing surface, facilitating a complex grinding motion. An abrasive medium is placed between the grinding tool and the sealing surface. As the tool moves, certain abrasive particles slide or roll, effectively cutting away a minuscule layer of metal from the sealing surface. This allows for the gradual smoothing of uneven features until the desired geometry is attained.

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Grinding extends beyond mere mechanical action; it also encompasses a chemical process. The greases in the abrasive material promote grinding by developing an oxide layer on the treated surface.

Purpose of Valve Grinding

Valve grinding, often referred to as a valve job or valve lap, is vital for the effective functionality of valves and seals. This process smooths out engine valves to ensure they remain sealed within the valve seat of the cylinder head, effectively securing the combustion chamber of the engine.

Importance of Grinding in Modern Production

As highlighted, industrial grinding machines form a crucial component of today’s industries. Their capability to extract minerals, reduce material sizes, and generate nanoscale materials with high precision and cost-efficiency underscores their significance.

Grinding Methodology

1. Initially, the grinding plane for shutting off the valve seat employs a coarse abrasive cloth. This continues until the sealing bevel and other groove marks are nearly eradicated.

2. Subsequently, a grinding head of similar size and angle is utilized, along with 120-240# SiC sandpaper. Light pressure is applied while grinding slowly until a reflection can be observed. The width of the sealing bevel is ideally 5-10% of the passage diameter. For tapered valves above DN>50, the sealing bevel width should be between 2.5-4.0mm. Under similar conditions, wider diameters require greater widths, but it's essential to manage this to prevent shortening service life or damaging due to solid particle extrusion.

3. After finishing the valve seat, the valve head should be shaped according to the same angle using a lathe. Coaxiality needs to be less than 0.015, with roundness below 0.005 to avoid ovality. The final procedure can be polished using 400# SiC sandpaper. Generally, centering clamping of the valve seat and head should occur under stable conditions, utilizing suitable centering sleeves during processing. Using 800# grit grinding paste is advisable to achieve a bright line without any swings.

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