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Coplanarity Test Method for Large Split Nut Columns

A detection method and nut column technology, which can be used in measuring devices, instruments, etc., can solve problems such as coplanarity detection of non-split nut column

Active Publication Date: 2017-01-11
CHINA ERZHONG GRP DEYANG HEAVY IND +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the traditional technology, there is no effective detection method to detect the coplanarity of the split nut column

Method used

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  • Coplanarity Test Method for Large Split Nut Columns
  • Coplanarity Test Method for Large Split Nut Columns

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Embodiment Construction

[0020] The invention aims to provide a method for detecting the coplanarity of a large-scale split nut column, which can effectively detect the coplanarity of the split nut column. The scheme of the present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0021] Taking the measurement of the coplanarity of the nut column of the Three Gorges ship lift as an example, since the assembled thread contact surface is a spatial curved surface, to accurately measure the coplanarity, the actual contour of the thread contact surface must be obtained first. For the measurement of the actual contour, it comes down to two methods: single-point measurement and scanning measurement. The number of measurement points will directly affect the accuracy of the final contour. In order to ensure the accuracy of the actual contour measurement, it is necessary to select equipment with continuous scanning measurement function Point cloud data co...

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Abstract

The invention relates to the detection technology for large irregular curved surfaces and discloses a large split type nut column coplanarity detection method. The coplanarity of a split nut column is detected accurately and effectively. The method comprises the steps that measuring bases are set, a nut column workpiece unified coordinate system is built, points on the corresponding spiral surfaces of threaded elements on the left side and the right side are collected under the unified coordinate system through the scanning function of measuring equipment, three-dimensional coordinate values of feature points on the detected spiral surfaces are obtained, preprocessing is carried out on the three-dimensional coordinate values, an actual spiral surface is constructed through three-dimensional modeling software, and the coplanarity of each single spiral surface and the coplanarity of the split type nut column are calculated according to the actual threaded surfaces and the standard threaded surfaces. The method is applicable to coplanarity detection on large irregular curved surfaces.

Description

technical field [0001] The invention relates to a detection technology for large-scale different-surface curved surfaces, in particular to a detection method for the coplanarity of large-scale split nut columns. Background technique [0002] For threads of general size, after the overall processing, the main parameters that affect the screwing and fit quality of the threads are: pitch diameter, thread pitch, half-angle of the tooth profile. When testing such workpieces, it is usually required to have four uniformly distributed on the circumference. position is detected. For large-scale nut workpieces (such as the nut column of the Three Gorges ship lift), due to the limitation of processing capacity, it is usually designed as a split type, that is, the processing process is processed according to split parts. After combining multiple nut parts through connecting parts and fixing parts, Then form the whole nut. For such a large nut workpiece, in addition to ensuring the pro...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01B21/30
Inventor 史苏存吴小云段玲石小兵
Owner CHINA ERZHONG GRP DEYANG HEAVY IND