Technical standard of cylinder cover inner hole platform honing reticulate pattern based on three-dimension

Abstract

The invention discloses a technical standard based on a three-dimensional cylinder liner inner-hole platform honing reticulate pattern. A contact or non-contact three-dimensional roughness measuring apparatus is adopted to test the cylinder liner inner-hole platform honing reticulate pattern, provide two-dimensional and three-dimensional scanning patterns, read out three-dimensional parameters to form a technical standard, and evaluate the platform honing reticulate pattern; the three-dimensional parameters of the technical standard includes the parameters that evaluates the surface defects, reticulate-pattern angle, functional parameters, the degree of three-dimensional surface skewness and the three-dimensional root mean square deviation of the surface. The application of three-dimensional parameters change the theoretical defect of former two-dimensional parameters, and more universality can be achieved when the requirement of cylinder-liner reticulate pattern is satisfied. The invention replaces traditional double-membrane testing method, a three-dimensional roughness measuring apparatus is used to change the situation of poor efficiency and limited precision of reticulate-pattern testing method; rigid control of the quality of cylinder liner can be achieved based on the features of fine structure such as piece cap, rough peak valley and other quantitative requirements.

Description

technical field [0001] The invention relates to a technical standard, in particular to a three-dimensional technical standard for honing an inner hole platform of a cylinder liner. Background technique [0002] The inner surface of the cylinder liner is processed into a cross-textured surface with deep grooves and small platforms evenly alternated by honing process. At the same time, there are certain requirements for the surface texture angle of the honing texture, the depth and number of grooves, the skewness of the contour figure, the length ratio of the contour support, and the processing quality of the surface layer. The honing surface with these requirements is called platform honing textured surface. [0003] Platform honing texture is beneficial to the storage of lubricating oil and the formation and maintenance of oil film, and has a high surface support rate, can withstand large loads, and is resistant to wear. There is no thermal damage and deterioration layer. ...

AI Technical Summary

Problems solved by technology

[0019] ① Insufficiency of mesh shape requirements and detection methods

[0025] ③Insufficiency of mesh angle measurement

Even for typical applications such as cylinder liner honing surfaces, there are distortions in the measurement results, e.g. two dividing line values ​​M for three areas of the contour r1 , M r2 value would be totally unreasonable

At the same time, this method itself is greatly affected by the resolution of the measuring instrument. One of the reasons for the large impact of the resolution of the measuring instrument is that the parameters themselves fail to reflect the inherent characteristics of the surface.

[0027] ⑤Contour arithmetic mean deviation R a unreasonable value

[0028] ⑥Distortion of two-dimensional parameters

The quantitative parameters in the above technical requirements all have a common fatal flaw. The excellent performance shown by the platform texture structure can only be reflected on the surface. Both the platform and the texture are built on a certain area. The contour cannot reflect its essential characteristics, and it is obviously not enough to accurately describe the characteristics of the entire surface with parameters based on the two-dimensional contour

At the same time, the machining process of parts is a random process. The surface has a large number of random and messy peaks and structures. Even a regular surface with strong periodicity will contain random quantities to varying degrees. The traditional surface quality evaluation is only based on a two-dimensional Contour, from a statistical point of view, the reliability is very poor, due to the limitation of the amount of information, there is a large deviation in the measured value of the two-dimensional parameters

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