Views: 0 Author: Site Editor Publish Time: 2022-07-29 Origin: Site
The hub, also known as the rim, is an important part connecting the brake drum (or brake disc), the wheel disc and the half shaft. It uses a bearing set on the axle tube or steering journal. The requirements of a good hub are: uniform density, round shape, small thermal deformation, high strength, and strong interchangeability. There are some very important indicators of the wheel hub in the inspection process: hole distance, position and thickness, etc. Therefore, the accuracy of the manufacturing inspection of the wheel hub is very important for the safety, speed, comfort and other performance of a car.
There are more than 30 main geometric inspection items of the wheel hub, and the vertical inspection scheme can complete the inspection of all items through one clamping. The combination with the CAD model can realize the functions of offline programming, simulation operation and digital-analog comparison. In particular, the introduction of the virtual standard ball in the detection of the dome height detection item reduces the error transmission link, saves the detection cost, and improves the detection accuracy. The contour point window processing function guarantees its accurate and convenient measurement. It has been widely used in the detection of many series of automobile wheels such as BMW, Mercedes-Benz, Volkswagen and General Motors.
As consumers pay more attention to the appearance of the car body, various companies have increased the emphasis on the accuracy of the car body. A beautiful car appearance is the best reflection of the design and craftsmanship of a car, and a high-precision body-in-white is the appearance of the car. The guarantee of man-hour saving, and this needs to start from the design, manufacturing and other links. If a worker wants to do a good job, he must first sharpen his tools, and advanced and applicable measuring instruments are essential. It can be said that the three-coordinate measuring system used for inspection in the production process has actually become an integral part of the process.
A portable CMM with high precision, high flexibility and strong adaptability to the environment, it can meet the detection of various sizes from small to large, in fixture accuracy assurance, fixture accuracy maintenance, parts single product status, sub-assembly status. It is widely used in the analysis of assembly status and adverse events.
Most of the parts of the car body are thin in thickness, and the beginning is complicated. There is stress in the processing process. In order to eliminate the influence of stress, it is necessary to position and cooperate with the parts. Adjustment within tolerance. The environment of the welding workshop is harsh, and the parts are repeatedly loaded and taken out. The welding fixture will inevitably loosen and wear, so it is necessary to regularly measure and maintain the fixture. Large-scale fixtures, such as general welding fixtures and floor assembly fixtures, need to be measured with a laser tracker. For the absolute majority of assembly fixtures, considering factors such as cost and frequency of use, portable CMMs are usually used. The portable three-coordinate measuring instrument obtains the deviation of the three-dimensional spatial coordinates of the fixture by measuring the spatial coordinate value of the fixture. Using these deviation values, the fixture can be analyzed and adjusted to achieve the purpose of improving the geometric size of the body.
Most of the parts of the car body are complicated at the beginning, and various parts are prone to failure when they are matched. The traditional analysis method relies on the experience of quality technicians, and adopts methods such as replacement, hand repair, and trial processing to respond and solve. Now the three-coordinate measuring instrument can not only measure the hole position, but also scan and analyze the shape and surface of the part, determine the bad position and deviation, and effectively determine the real cause.
The application of the gantry type CMM in the automobile manufacturing industry is the actual situation that many people in the industry know. So what are the positive effects of the gantry type CMM in the automobile manufacturing industry?
1. It can ensure the smooth progress of the manufacturing process
In the manufacturing process of automobiles, some of the more important points are to ensure that the standards of the manufactured parts used are consistent in both production and design, so the operator is required to control the manufacturing process well. If the control standards are to be consistent, certain measurement tools must be used. After using certain measurement tools to measure the standard, if the subsequent standards are to be consistent, then the gantry type CMM will play a role at this time. its huge effect. It can be said that the gantry type CMM is the most convenient way to obtain the correct size in automobile manufacturing.
2. Can do constant work on the final test result
After the construction of each car, all aspects of its performance must be tested. When all the tests are qualified, it can be sold from the factory. For many aspects of automobile inspection, the inspection of the gantry-type three-coordinate measuring instrument is inseparable. For example, whether the parts inside the car can work normally, etc. As for the detection of automobiles, it should be said that it is a more critical matter, because after the unqualified automobiles are put into the market, they may cause personal injury to the drivers of the automobiles. In order to effectively avoid the occurrence of this phenomenon, it is necessary to use the gantry-type three-coordinate to monitor the various components.
