A Conformal Measurement and Processing Control Method for Oval-shaped Jewelry

Abstract

The invention discloses a method for controlling shape-based measurement and processing of a kind of ellipse-shaped jewelry. The method includes steps 1. Pre-programming a coordinate program for automatic processing of a numerical control machine tool according to the external dimensions of a standard jewelry blank; 2. Using the center point of the elliptical-shaped jewelry As the origin, control the probe of the processing machine tool to automatically detect point by point around the jewelry blank to obtain the spatial coordinate position of the outer surface of the jewelry blank to be processed; 3. Compare the detected outer surface space coordinates with the standard jewelry blank outer shape space coordinates Comparing and calculating, the processing and calibration data obtained are 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. Start the processing of the cutter head of the CNC machine tool to obtain a standard jewelry blank. It can dynamically measure each piece of jewelry along with the shape, automatically and precisely correct and compensate the deviation, which greatly improves the processing accuracy and makes the pass rate of all kinds of jewelry processing reach more than 99.8%, which saves the cost of gold and improves 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] 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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