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Deformation failure mechanism of automobile parts 1) Definition: Deformation is defined as the change of the size and shape of a part due to the action of load or internal stress during its use. Deformation is an important cause of parts failure, such as crankshaft, clutch friction disc, transmission shaft and spindle. 2) classification of deformation failure: elastic deformation failure, plastic deformation failure and creep failure. 3) factors affecting the deformation of automotive parts Deformation failure of parts except metal materials, design stiffness and manufacturing process related to the installation of improper fastening or work has obvious overload phenomenon humidity: with the increase of working temperature, the strength of materials will also decline, so at higher temperatures working parts are prone to deformation of the deformation clutch piece warping deformation brake drum, exhaust manifold changes For foundations, there is internal stress due to imperfect ageing treatment during casting, which causes deformation due to stress redistribution in application, and incorrect repair techniques or methods, such as welding thermal stress. Feilong jiangli will update analysis of more auto parts failure models.
The damage of automobile parts mainly includes four types: deformation, fracture, corrosion and wear. The first three types of damage are usually repaired by cold working, hot working or gluing. If the general parts deformation can be cold-pressed or hot-pressed after correction for mechanical repair; shaft parts can be broken by inlaying, welding, forging and other methods to repair; cylinder block water jacket cracks can be repaired by welding, riveting or adhesive methods. Parts wear is the most common damage. Parts that have not worn out beyond the specified repair size are processed according to repair size. Parts that have worn out beyond the repair size are repaired by surfacing, spraying, electroplating and other metal covering processes and adhesive methods. Electroplating Repair Method This method is to use the part to be repaired as the cathode, so that the metal cations in the electrolyte move toward the part (cathode) under the action of electric field force, and deposit on the surface of the part. The advantage of the electroplating method is that it can obtain a good wear resistant layer and no distortion of the parts. Chromium plating is often used to repair automobile parts, followed by iron plating chromium plating and iron plating are both electrode crystals, with similar ultra-fine grains and high dislocation structure and large internal stress, and is stratified, with a large number of microcracks. But the chromium plating layer and the iron plating layer have their own characteristics, such as high hardness, good wear resistance, and prolonging the service life of the parts. The disadvantages are low current efficiency, slow deposition, thin coating, high cost, and highly toxic chromium anhydride, serious environmental pollution. The electrolyte temperature of iron plating used to be above 90 C, which can reduce the internal stress of the coating and prevent peeling, but the hardness of the coating is on the low side. In 70s, the wear resistance and the bonding strength of the coating were increased by using low temperature iron plating at 45 C. Iron plating also has the advantages of fast accumulation, low cost and no pollution to the environment.
Failure concept The failure of automobile parts to lose the functions specified in the original design is called failure. Failure refers not only to the complete loss of original functions, but also to functional degradation and serious damage or hidden dangers, continued use will lose reliability and safety components. Basic form of failure Classification of failure according to failure mode and failure mechanism is an important part of failure study. Automobile parts can be classified into five types according to their failure modes, i.e. wear, fatigue fracture deformation, decay and aging. Several failure modes or failure mechanisms may exist simultaneously for each part. Feilong jiangli try his best to take all the conditions into consideration to develop the best water pumps and other parts for the customers.
Grinding is the process of grinding metal with a grinding wheel on a grinder. Grinding is one of the main methods of finishing. In the automobile industry, the grinding machine accounts for about 25%. Therefore, finishing and grinding of hardened materials is a common method. In addition, grinding is easy to automate, and is conducive to efficient production. Grinding has the following characteristics: 1. The grinding wheel has high abrasive hardness and good heat resistance, so it can grind hard materials that metal tools can not process. 2. Grinding can remove very thin and very fine chips, the chip thickness is generally only a few microns, therefore, has a strong correction ability, processing accuracy can reach T6~IT5, surface roughness of Ra0.1 micron. 3. high grinding speed. 4. The cutting temperature is high, and the instantaneous maximum can reach 1000 degrees Celsius. Therefore, the grinding surface is easy to produce residual stress, burn and crack. According to the geometry of the object, grinding can be divided into outer circle, inner circle, plane and formed surface. By clamping and driving the workpiece, it can be divided into centering grinding and centerless grinding. According to the feed direction, it can be divided into longitudinal feed and transverse feed. According to the working surface types of grinding wheels, they can be divided into peripheral grinding, end grinding and peripheral grinding. The types of grinding machines commonly used in automobile manufacturing are ordinary grinder and special grinder. Ordinary grinder includes: cylindrical grinder, internal grinder, surface grinder, centerless grinder, etc. Special grinding machines include camshaft grinder, crankshaft grinder, cross shaft grinder and so on. https://s1.ax1x.com/2018/08/22/Po50z9.jpg