Planar jewelry shape follow-up measurement processing control method

Abstract

The invention discloses a planar jewelry shape follow-up measurement processing control method which comprises the following steps: 1, according to the boundary dimension of a standard jewelry blank,pre-compiling an automatic processing coordinate program of a numerical control machine tool and inputting the program into a computer of the numerical control machine tool; 2, taking the jewelry surface as a reference surface, dividing the jewelry appearance surface into an X-axis grid surface and a Y-axis grid surface, controlling a probe of a processing machine tool to perform automatic point-by-point conformal detection around the jewelry blank, and obtaining the spatial coordinate position of the appearance surface needing to be processed of the jewelry blank; 3, comparing and calculatingthe space coordinates of the appearance surface, needing to be processed, of the detected jewelry blank with the space coordinates of the appearance surface of the standard jewelry blank to obtain processing calibration data; and 4, starting a numerical control machine tool bit, and processing the machine tool bit along the actual shape of the jewelry blank all the time according to the actual processing parameters to obtain the standard jewelry blank. Planar jewelries can be dynamically measured in a conformal mode, compensation deviation is automatically and precisely corrected, and the machining precision of a numerical control machine tool is greatly improved.

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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