A Grinding Process for the Shape of Needle Valve Body of Common Rail Injector

Abstract

The invention relates to a common rail oil nozzle needle valve body shape grinding process. The process comprises the two steps of (1) head forming and grinding and (2) appearance forming and grinding. According to the common rail oil nozzle needle valve body shape grinding process, common rail oil nozzle needle valve body shape grinding can be completed only through two steps, the production efficiency is greatly improved, the labor intensity is reduced, the surface roughness is improved, burrs at the junction are effectively avoided, the surface texture of the whole shape is fine and consistent, and conditions are provided for subsequent laser clear marking.

Description

Technical field[0001]The invention relates to a needle valve body grinding process, in particular to a common rail fuel injection nozzle needle valve body contour grinding process.Background technique[0002]The traditional shape grinding process of the common rail nozzle needle valve body has been used for many years. The process design principle takes into account that the shape grinding needs to ensure the product function requirements such as the position and size of the nozzle oil injection intersection point, head strength, and wall thickness concentricity. The traditional processing methods are mostly ordinary cylindrical grinders, so the designed process is divided into two stages: A benchmark processing OP010 grinding 60° process angle-OP020 grinding large external circle-grinding the middle hole seat surface; B final shape processing OP040 grinding Cutting the middle and outer circle and shoulder blade surface-OP050 grinding small outer circle and inclined surface-OP060 grin...

AI Technical Summary

Problems solved by technology

[0002] The shape grinding process of the traditional common rail nozzle needle valve body has been used for many years. The process design principle takes into account the shape grinding needs to ensure the functional requirements of the product such as the position and size of the fuel injection intersection point of the fuel injector, the head strength, and the concentricity of the wall thickness. Most of the traditional processing methods are ordinary cylindrical grinding machines, so the design process is divided into two stages: A benchmark processing OP010 grinding 60° process angle-OP020 grinding large outer circle-grinding the center hole seat surface; B final shape processing OP040 grinding Cutting the middle outer circle and scapular surface-OP050 grinding small outer circle and inclined surface-OP060 grinding ball head-OP070 grinding chamfering, the size chain design is also based on ensuring the position of the injection hole and the extension length of the nozzle ball head. For ordinary cylindrical grinding machines, the final processing is based on the seat surface and the center hole. This process has problems such as low precision, many and complicated processes, low efficiency, and high employment.

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