Machining control method for follow-up measurement and application thereof in jewelry processing field

Abstract

The invention discloses a machining control method for follow-up measurement and application thereof in jewelry machining field. The method comprises the following steps of S1, pre-programming a coordinate program for automatic machining of a numerical control machine tool according to the boundary dimension of a standard jewelry blank; S2, controlling a probe of a machining tool to detect the jewelry blank point by point automatically in a follow-up manner to obtain a spatial coordinate position of a shape surface needed to be machined for the jewelry blank and feeding the position back to acomputer of the numerical control machine tool; S3, comparing and calculating the spatial coordinate position of the shape surface of the detected jewelry blank and the shape spatial coordinate of thestandard jewelry blank to obtain machining calibration data, and compensating the machining calibration data to a coordinate parameter of automatic machining in advance automatically to obtain the actual machining parameter of the numerical control machine tool; and S4, starting a tool bit of the numerical control machine tool to machine to obtain the standard jewelry blank. Each piece of jewelrycan be measured dynamically in a follow-up manner, and deviation is calibrated and compensated automatically and precisely, so that the machining precision of the numerical control machine tool is improved greatly, and therefore, the machining percent of pass of jewelry of various types reaches over 99.8%, and the rejection rate is reduced obviously.

Description

technical field [0001] This scheme belongs to the field of mechanical processing, specifically the application field of jewelry processing. Background technique [0002] A CNC machine tool is an automated machine tool equipped with a program control system. The control system has a high degree of automation and works according to the designed operating program. There are three-axis CNC machine tools and five-axis CNC machine tools. Among them, the XYZ three-axis mechanical arm can move in three-dimensional space, and the five-axis CNC machine tool has high machining accuracy and stability. The processing quality is usually used to process metal parts and plastic parts. [0003] Many jewelry such as gold, silver, K gold, platinum, palladium and other metal jewelry processing usually rely on manual processing with simple electric polishing tools, such as the patent name "Hollow Bracelet Manufacturing Integrated Equipment", CN201711431380 .4. In the traditional hollow bracele...

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 0.2-1 mm difference in different parts, plus 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 measurement axis, the accumulation of various deviation values ​​often leads to the machining of jewelry according to a fixed program, the tool operation is unstable, and the engraving pattern error of 0.05-1 mm is prone to occur, resulting in product scrap rate Large, up to 4-25%, the cost of materials is huge, affecting the quality of jewelry and making it impossible to sell

[0005] Because of the changeable shape and soft texture of jewelry, it is required to process patterns and the grinding angle is extremely precise. Traditional CNC machine tools do not have suitable and accurate detection methods and advanced comparison control algorithms, so they cannot accurately compensate and control the tool according to the deviation value of each piece of jewelry. Operating position, unable to achieve 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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