A control method for conformal measurement and processing of flat jewelry

Abstract

The invention discloses a control method for shape-based measurement and processing of plane jewelry, which includes step 1. according to the external dimensions of standard jewelry blanks, pre-programming a coordinate program for automatic processing of a numerical control machine tool and inputting it into a computer of the numerical control machine tool; step 2. taking the jewelry surface as the The reference plane divides the jewelry profile surface into XY-axis grid surfaces, controls the probe of the processing machine tool to automatically detect point by point around the jewelry blank, and obtains the spatial coordinate position of the jewelry blank to be processed; step 3. Compare and calculate the space coordinates of the outer surface of the blank to be processed with the outer space coordinates of the standard jewelry blank to obtain the processing calibration data; step 4. Start the CNC machine tool head, and according to the actual processing parameters, the machine tool head is always along the jewelry The actual shape of the blank is processed to obtain a standard jewelry blank. It can dynamically measure flat jewelry along with the shape, automatically and precisely correct and compensate deviations, which greatly improves the machining accuracy of CNC machine tools.

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 its irregular shape, two-dimensional jewelry can be drop-shaped, crescent-shaped, etc. The moving distance and angle of the probe detection of the existing machine tools on the market are not easy to calculate and control. In addition, it is required to process patterns and the grinding angle is extremely accurate. Traditional CNC machine tools Without a suitable and accurate detection method and an advanced comparison control algorithm, it is impossible to accurately compensate and control the operating 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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