Axial elastic precise positioning clamping device for needle valve parts

Abstract

Disclosed is an axial elastic precise positioning clamping device for needle valve parts. When conveyed into an inner hole of a self-centering expansion sleeve, a needle valve is precisely axially limited by an elastic axial limit structure at first, and then is clamped by an actuating sleeve in an expansion and contraction manner, the self-centering expansion sleeve is axially fixed during clamping, accordingly, the distances from two variable-frequency electric spindles to end surfaces to be machined are ensured, precision of high-precision axial dimensions from an abutting end surface to an oil outlet conical surface of the needle valve is accurately controlled, and perpendicularity of the abutting end surface relative to a reference of a valve needle hole can also be guaranteed.

Description

Technical field: [0001] The invention relates to the processing equipment of shaft sleeve parts in oil pump oil nozzle and fuel injection nozzle, in particular to the end face processing equipment of high precision shaft sleeve parts. Background technique: [0002] High-precision shaft sleeve parts are used in all kinds of machinery, and some parts have high design requirements, which cannot be met by conventional processing equipment. [0003] figure 1 It is a schematic diagram of the structure of the high-pressure common rail injector assembly produced by Bosch in Germany, which includes solenoid valves, solenoid valve spring adjustment washers, solenoid valve springs, bushing rings, solenoid tight caps, control valve couplings, valves Components, orifice positioning pins, sealing rings, spring upper seats, adjusting gaskets, pressure regulating springs, ejector rods, transition blocks, nozzle positioning pins, nozzle couplings, nozzle tight caps, upper sealing rings and ...

AI Technical Summary

Problems solved by technology

[0004] At present, the end face processing of high-precision shaft sleeve parts similar to the needle valve body of the fuel injector is positioned on the outer circle of the needle valve body, and the three processes of rough grinding, fine grinding and super fine grinding are ground step by step. Processing, the clamping of the needle valve body is the same as the processing method of domestic oil pump nozzle parts, both of which use image 3 The shown self-centering expansion sleeve is clamped. When the expansion sleeve is tightened, the workpiece will move with the expansion sleeve in the axial direction. The needle valve body has no stable positioning reference in the axial direction. The three axial dimensional accuracy of fuel injection quantity is 39.6 -0.08 、40.23 -0.01 and 42.1 +0.05 Difficult to meet design requirements, poor stability

At the same time, the needle valve body needs to be installed three times during the grinding process, and there is an installation error, which may easily cause the verticality of the butt end face 53 relative to the needle valve hole reference A to be out of tolerance; the grinding of the butt end face 53 is a common high-speed grinding head The flatness, straightness and surface roughness of the butt end face 53 sometimes fail to meet the requirements; such processing technology and grinding processing equipment not only require more auxiliary time, but also have a low yield

[0005] Through the above objective analysis, it can be seen that in the existing diesel engine high-pressure common rail injector, the design of the butt joint end surface grinding process of the needle valve body is unreasonable, and the processing quality is unstable with the existing cylindrical grinding machine, especially the needle valve body. The installation and positioning method is unreasonable, the clamping of parts does not have a unified positioning reference in the axial direction, and there are misalignment errors in multiple installation and clamping

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