A three-dimensional measuring instrument mainly refers to an instrument that measures by taking three-dimensional points. There are also called three-dimensional coordinate measuring machines, three-dimensional coordinate measuring machines, three-dimensional coordinate measuring machines, and three-dimensional measuring instruments on the market. The main principle is: by placing the measured object in the three-dimensional measurement space, the coordinate positions of each measuring point on the measured object can be obtained. Based on the spatial coordinate values ??of these points, the geometric size, shape and position of the measured object can be obtained through calculation. . The basic principle is to obtain the discrete spatial point position of the measured geometric element through the cooperation of the detection sensor (probe) and the movement of the measurement space axis, and then complete the analysis and simulation of the measured point (point group) through certain mathematical calculations. Combined, the measured geometric element is finally restored, and on this basis, the deviation from the theoretical value (nominal value) is calculated, thereby completing the inspection of the measured part.
Three-dimensional coordinates Coordinate Measuring Machine (CMM), also known as three-dimensional measuring machine, is called three-dimensional measuring machine in Japanese and three-dimensional measuring machine or three-dimensional coordinate measuring machine in mainland China. In Taiwan, in order to distinguish the two-dimensional image measuring instrument from the so-called non-contact three-dimensional (or 2.5D), its so-called 0.5D refers to the Z-axis with an optical ruler, which can use the focus of the lens itself to achieve height or step difference. Measurement), so it is also called contact three-dimensional. As the name implies, the measurement method of this machine is to measure the workpiece by directly touching the detection system.
The measurement principle is to use a probe (most of which has a ruby ??ball at the end) to collide with the edge of the workpiece, obtain the coordinate value of the position, and then subtract the radius of the probe to obtain the workpiece's Actual coordinate value. Generally, the three axes of the measuring instrument are equipped with optical rulers. When the probe contacts the workpiece, a signal will be sent to capture the current coordinate value. Then, through calculation and processing by the measurement software, the coordinate value or size we want can be calculated. , so you only need to pick points according to the measurement location to get the measurement data.
The composition of the three-dimensional measuring instrument:
1. Host mechanical system (X, Y, Z three-axis or other);
2. Probe system ;
3. Electrical control hardware system;
4. Data processing software system (measurement software);
5. Forward engineering: product design-- >Manufacturing-->Inspection (three-dimensional measuring instrument)
Currently, most three-dimensional machine structures use precision granite as the platform, and better machines use granite above grade 00. granite. Most of the three-axis structures are made of granite, some models use aluminum alloy or cast iron, and higher-end models use carbon fiber, ceramics or other composite materials. The common external structure is gantry type (or mobile bridge type), and other more common ones are unilateral bridge type (or L bridge type), bilateral bridge type, cantilever type, etc.
Edit the purpose of this paragraph The purpose of the measuring instrument:
Accurately measure the size, angle, shape and position of various workpieces
As well as various types of threaded parts Parameters, suitable for machine manufacturing
precision manufacturing, mold manufacturing, instrument manufacturing,
electronics industry, measurement rooms in plastics and rubber industries, and for machinery
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Quality inspection of parts, measuring tools, cutting tools, fixtures, molds, electronic components,
circuit boards, stamping parts, plastic and rubber products