A method for controlling curved surface of jewelry with conformal measurement and processing

Abstract

The invention discloses a control method for follow-up measurement and processing of arc-shaped jewelry surfaces. The probe of the machine tool automatically detects point by point around the jewelry blank, and obtains the spatial coordinate position of the outer surface of the jewelry blank to be processed; 3. Compare and calculate the detected outer surface space coordinates with the standard jewelry blank outer shape space coordinates , the processing calibration data obtained is automatically compensated to the coordinate parameters of the automatic processing in advance, and the actual processing parameters of the CNC machine tool are obtained; 4. The CNC machine tool head processing is started to obtain a standard jewelry blank. It can dynamically measure each piece of arc-shaped jewelry according to the shape, and automatically and precisely correct and compensate the deviation, which greatly improves the machining accuracy of the CNC machine tool, improves the processing speed and economic benefits.

Description

technical field [0001] This scheme belongs to the field of mechanical processing, specifically the application field of jewelry processing. Background technique [0002] Many jewelry such as gold, silver, K gold, platinum, palladium and other metal jewelry processing usually rely on manual or mechanical processing with simple electric grinding tools, such as the patent name "hollow bracelet manufacturing integrated equipment" , CN201711431380.4, in the traditional hollow bracelet manufacturing process, the two processes of processing gold and silver sheets into round tubes and round tubes into rings are processed by mechanical processing, but the processing accuracy of this operation is difficult to reach 0.05-0.5 mm The requirements for engraving patterns on bracelets cannot guarantee the same size, thickness and fine patterns of thousands of bracelets. [0003] At present, five-axis CNC machine tools are only used to process hard metal materials such as stainless steel an...

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] Because of the irregular shape and non-uniform radian of arc-shaped jewelry, there is no fixed processing for flat-shaped jewelry, which 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. The movement distance and angle of the probe detection of organic machine tools are not easy to calculate and control. It is impossible to accurately compensate and control the running position of the tool according to the deviation value of each piece of jewelry, and it is impossible to achieve a surface processing depth accuracy of 0.01-0.2 mm for 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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