Views: 0 Author: Site Editor Publish Time: 2022-09-12 Origin: Site
With the rapid development of economy, automobiles have been widely recognized and used by human society. However, as the living standards and material requirements of human beings are getting higher and higher, the product quality of the car itself is more and more concerned by users and car manufacturers.
The coordinate measuring machine is a high-efficiency and precise general-purpose measuring and testing equipment developed after the middle of the 20th century, which integrates optics, microelectronics technology, mechanical design and manufacturing, computer hardware and software, and automatic control technology. It can use the mutual movement of the three axes, under the monitoring and coordination of the digital control system, through the operation of the user-friendly and powerful software, to accurately measure the features and interrelationships of the basic elements such as points, lines, and surfaces of the parts, as well as the space.
Position dimensions and shape position tolerances of related dimensions, etc. In recent years, with the rapid development of computer hardware and measurement software technology, curve and surface measurement software for special function detection, measurement software for sheet metal parts and thin-walled metal parts, various gear detection and evaluation software, and thread detection software. A variety of detection software for complex geometric profiles have come out one after another, coupled with the application of optical scanning, laser scanning, CCD technology, and the continuous development of reverse engineering, making the application prospects and fields of measuring machines continue to expand.
CMM has now become an indispensable testing equipment in aviation, aerospace, machinery, automobile manufacturing and other fields, and is an important unit of design, manufacturing and testing integration. In the automotive industry, the CMM can not only complete the automatic online inspection of the automobile production line and the quality control of key parts, but also be applied to the whole process of automobile development, research and production, which accelerates the automobile research and development cycle. It has opened up a new era of R&D and manufacturing in the automotive field.
The production and manufacture of automobiles are inseparable from the CMM. The high quality of the product is fundamentally achieved through the manufacturing process, rather than relying on final inspection to obtain and guarantee. The goal of quality in the modern manufacturing industry is to keep parts produced as closely as possible to design requirements. However, to ensure the consistency of the production process and design, the manufacturing process must be controlled. The most effective way to control the manufacturing process is to accurately measure the size of the workpiece, after obtaining the dimensional information, analyze and feedback the data to the production process, so as to continuously improve the product quality. For automobile mass production enterprises, process control should be emphasized and emphasized. At the heart of process control is the accurate measurement of workpiece dimensions.
The application of CMM in the automobile industry runs through the whole process of automobile R&D and production. Different types of CMM play an important role in each link. Taking the three main types of components in automobile production: thin-walled workpieces, body-in-white inspection and box-type workpieces as examples, the main applications of measuring machines in the automotive industry are discussed:
1. Thin-walled parts
Thin-walled parts are a type of parts that are widely used in the automotive industry, have high quality requirements, and are difficult to measure. It mainly includes sub-assemblies, stamping parts, instrument panels, interior parts, plastic parts, etc., which have typical thin-walled parts that are easily deformed. The selection of a coordinate measuring machine for detection sub-assemblies needs to take into account accuracy, suitable for workshop environmental conditions and high repeatability. performance and stability requirements. Bridge CMM has become a good choice for measuring various sub-assemblies because of its small footprint, low cost, relatively stable structure, fewer moving parts, and better rigidity and stability.
2. Detection of body-in-white: a large horizontal double-cantilever coordinate measuring machine or a gantry-type coordinate measuring machine can be used. These machines have a large enough measurement range to detect the body-in-white of the car: when the accuracy requirements are met, considering the body characteristics, it is recommended to first choose a horizontal double cantilever coordinate measuring machine. The reasons are as follows: the openness of the horizontal double cantilever coordinate measuring machine is relatively good, its working bottom can be sunk into the ground, and its upper surface is flush with the ground. In this way, the parts can be hoisted from various angles, which is very convenient and easy; the structure of the horizontal arm makes it easier for the probe to enter each measured part of the workpiece, including the inner area of the body frame or the bottom of various thin-walled parts or even Bottom inside. The probe device installed at the end of the measuring arm has the function of double coordinate rotation, which makes the measuring machine more adaptable and flexible. The advanced multi-axis control system can manipulate the double arms of 10 coordinates, and simultaneously measure the workpiece from both sides. The detection and measurement work efficiency is very high.
3. Box-type workpieces: Many parts of the powertrain part of the car have complex structures and have certain requirements for rigidity and strength. Such as shafts, connecting rod pistons, engine blocks, reducers, etc. The inspection of box-type parts in the automotive industry has distinct characteristics: multi-parameter comprehensive inspection; a large amount of data analysis and statistical analysis, which requires final inspection; relatively complex parts with large changes in volume and high flexibility. Based on the above characteristics, using the measuring machine as its detection tool can solve such problems very well. For example, the cylinder bore detection of automobiles.
In conclusion, CMM is one of the most effective ways to accurately obtain measurement and evaluation dimensional data, and can replace a variety of surface measurement tools, plane measurement tools, expensive fixed or custom combination gauges, and precise manual measurement by one device tools, thereby greatly reducing the time required to complete complex vehicle inspections.
While providing useful information on production process conditions such as dimensional data for process control, measuring machines can also provide many additional capabilities such as incoming product inspection, machine tool accuracy verification, customer quality certification, gauge inspection, machining tests, and optimization of machine tool settings. For the inspection of stamping parts, body-in-white, sub-assemblies, seats and interior parts, which are widely used in the automobile manufacturing industry, the manufacturer of the CMM has correspondingly developed auxiliary links and sheet metal parts related to conveying, clamping, etc. The procedures of metal parts inspection ensure the installation of components and the interchangeability of parts, and the appearance of the body is beautiful and generous.
