In the whole process of part manufacturing, measuring the finished parts is also an important part. The data obtained through measurement can help you judge the quality of parts without the actual object, and the more accurate the measuring instrument is, the more accurate the data can be provided. Nowadays, most regular manufacturers will be equipped with a high-precision measuring instrument instrument.
Among the commonly used high-precision measuring instruments, the two-dimensional imager and the three-coordinate measuring machine are the two most widely used instruments. Since the two machines measure differently, their fields of application are also different. The two-dimensional imager mainly uses non-contact measurement, so it is more suitable for measuring electronic accessories, precision hardware, flat glass, screens, etc. The three-coordinate measuring machine is through contact measurement, focusing on the machinery industry, mold industry and automobile industry.
This article will give you a quick introduction to the coordinate measuring machine.
What is a coordinate measuring machine?
Three-dimensional coordinate measuring machine mainly refers to an instrument for measuring by taking three-dimensional points. Its 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 of the measured point (point group) through certain mathematical calculations Fitting, finally restore the measured geometric elements, and calculate the deviation between them and the theoretical value (nominal value) on this basis, so as to complete the inspection of the measured parts.
This working principle of CMM makes it have great versatility and flexibility. In principle, it can measure any parameter of any geometric element of any workpiece.
The three-coordinate measuring machine is a typical mechatronic equipment, which consists of two parts: mechanical system and electronic system.
(1) Mechanical system: generally composed of three orthogonal linear motion axes. The X guide rail system is installed on the workbench, the moving bridge beam is the Y guide rail system, and the Z guide rail system is installed in the central carriage. Grating scales are installed on the axes in three directions to measure the displacement value of each axis. Manually driven handwheels and motorized and numerically controlled motors are generally located near each axis. The probe used to touch the surface of the tested part is installed at the end of the Z axis.
(2) Electronic system: generally composed of grating counting system, probe signal interface and computer, etc., used to obtain the measured coordinate point data and process the data.
The common appearance 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 and so on.
Common transmission methods are divided into two types: manual transmission and motor transmission. Generally, there are three types of models:
Manual measurement: directly pull the Z axis or manually rotate the hand wheel to move.
Electronically controlled measurement: the motor is installed on the moving shaft, and the movement is controlled by a rocker or an electronic handwheel.
CNC (DCC) automatic measurement: Servo motors are installed on all moving axes, and the electronic control system can be used for automatic measurement under program instructions.
The use of three-coordinate measuring machine
The three-coordinate measuring machine can accurately measure the size, angle, shape and position of various workpieces, as well as various parameters of threaded parts. It is suitable for machine manufacturing, precision engineering, mold manufacturing, instrumentation manufacturing, electronics industry, plastics and The measurement room of the rubber industry is good at quality inspection and comparison of mechanical parts, measuring tools, knives, fixtures, molds, electronic components, circuit boards, stamping parts, plastic and rubber products.
Hope the above content is helpful to you.
