Shape follow-up measurement processing control method for ellipse-like jewelries

Abstract

The invention discloses a shape follow-up measurement processing control method for ellipse-like jewelries. The method comprises the following steps: 1, writing an automatic processing coordinate program of a numerical control machine tool in advance according to the boundary dimension of a standard jewelry blank; 2, by taking the central point of the ellipse-like jewelry as an original point, controlling a probe of a machining tool to carry out automatic point-by-point shape follow-up detection around the jewelry blank to obtain a spatial coordinate position of a to-be-processed appearance surface of the jewelry blank; 3, comparing and calculating the space coordinates of the detected appearance surface with the space coordinates of the appearance of the standard jewelry blank to obtain machining calibration data, and automatically compensating the machining calibration data into the coordinate parameters obtained after automatic processing in advance to obtain actual machining parameters of the numerical control machine tool; and 4, starting a tool bit of the numerical control machine tool for machining to obtain a standard jewelry blank. Each piece of jewelry can be measured ina dynamic shape follow-up mode, and compensation deviation is automatically and precisely corrected, so that machining precision is greatly improved, the machining percent of pass of various jewelriesreaches 99.8% or above, gold cost is saved, and economic benefits are improved.

Description

Technical field [0001] This scheme belongs to the field of mechanical processing, and the application field of specific jewelry processing. Background technique [0002] Many jewelry processing such as gold, silver, K gold, platinum, palladium and other metal jewelry usually rely on manual or mechanical processing with simple electric grinding tools, such as the patent name "Integrated Equipment for Hollow Bracelet Manufacturing" , CN201711431380.4, in the traditional hollow bracelet manufacturing process, the two processes of processing the gold and silver sheets into a round tube and the round tube into a ring are processed by mechanical processing, but the processing accuracy is difficult to reach 0.05-0.5 mm. The requirement of carving patterns on bracelets cannot guarantee that thousands of bracelets have the same size, thickness and fine patterns. [0003] At present, the five-axis CNC machine tool is only used to process hard metal materials such as stainless steel and cast...

AI Technical Summary

Problems solved by technology

This is because the shape, size, texture, and inner and outer patterns of different jewelry are different. Because each jewelry rough body has slight differences in thickness and size, such as 0.1-1mm difference in different parts, plus the assembly to the machine tool fixture When it is fixed on the top, there is a deviation value for jewelry clamping. In addition, the five-axis CNC machine tool itself has mechanical deviation values, including linear error, straightness in the horizontal direction, straightness in the vertical direction, yaw angle in the horizontal plane, pitch angle in the vertical plane, and The roll angle deviation around the measuring axis, the accumulation of various deviation values ​​often leads to machining according to a fixed program when machining jewelry, the tool operation is unstable, and 0.05-mm engraving pattern errors are prone to occur, which leads to a high product scrap rate , up to 4-25%, the cost of materials is huge, which affects the quality of jewelry and cannot be sold

[0004] Due to the irregular shape of oval-shaped jewelry, there is no fixed processing for round jewelry. It requires processing patterns and extremely precise grinding angles. Traditional CNC machine tools do not have suitable and accurate detection methods and advanced comparison control algorithms, so they cannot be processed according to the shape of each piece of jewelry. Deviation value, precise compensation and control of the tool running position, it is impossible to achieve a depth accuracy of 0.01-0.2 mm for surface processing of various shapes of jewelry

Existing machine tool processing technology cannot guarantee industrial production to process thousands of pieces of jewelry a day, with high quality and extremely low scrap rate

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