A processing method for high-precision valve assembly

Abstract

The invention discloses a machining method of a high-precision valve assembly. The machining method comprises the following steps that a, a part I and a part II are selectively assembled through matchgrinding, and then the part I is pressed into the part II and fixed; b, the diameter D1 of a hole a in the part II is measured, and then the fit clearance theta between the hole a and a valve part III is ensured through match grounding of the outer circle of the valve part III, wherein theta = 0.005-0.009mm; c, the thickness L from the end surface d of the valve part III to the annular groove endsurface e of the valve part III is calculated, and the end surface d is ground according to the calculated thickness L; and d, on the premise of ensuring a dimension A and a dimension B in the step c, the distance S1 between the end face a and the end face c is ensured by grinding the end face a or the end face c of the valve part III, and S1 = 22+ / -0.05 mm. The machining method meets the requirements of the fit dimensions of the high-precision valve assembly, and the air tightness of the high-precision valve assembly is effectively ensured.

Description

technical field [0001] The invention relates to the field of valve component processing, in particular to a high-precision valve component processing method. Background technique [0002] As a sealing element in hydraulic and pneumatic systems, valve components are widely used in aviation, aerospace, energy, automobile and other fields. The valve assembly requires high precision, and has multi-directional matching requirements for radial fit and axial fit: to ensure that the shaft and hole fit clearance θ=0.005~0.009mm, opening size 0.5±0.05mm, and overlapping size 0.02~0.05mm In this case, at the same time, it is necessary to ensure the distance S1=22±0.05mm between the end face a and the end face c; not only that, when the high pressure of aviation kerosene of 12MPa is introduced, it is also necessary to meet the sealing performance test requirements (see figure 1 ). Adopt traditional processing method, there are following problems: [0003] 1) In the case of ensuring t...

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Problems solved by technology

[0003] 1) In the case of ensuring the opening size of 0.5±0.05mm and the overlapping size of 0.02~0.05mm, the size S1=22±0.05mm cannot be guaranteed at the same time

[0004] 2) When the valve part Ⅲ is in figure 1 In the position state, that is: A=0.02~0.05mm, B=0.5±0.05mm, the C port is fed with 12MPa aviation kerosene, and the leakage of D port cannot be guaranteed to be less than 10ml / min

[0005] 3) When the valve part Ⅲ is in figure 2 In the position state, that is: A=0.5±0.05mm, B=0.02~0.05mm, the H port is fed with 12MPa aviation kerosene, and the leakage of D port cannot be guaranteed to be less than 10ml / min

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