The cast iron T-slot platform is widely used in the assembly, debugging, welding, riveting and welding of power machinery equipment. This product has a T-slot on the surface, which can fix the mechanical equipment. It is precisely the cast iron T-slot platform that has such a wide range of uses, and the quality requirements of its products are even stricter, especially the occurrence of stress deformation and cracks during the casting process.
Similarly, we first introduce the common characteristics of the widely used cast iron T-slot platform. Generally, the working surface of the cast iron T-slot platform adopts the scraping process, which is inspected by the method of painting to ensure the accuracy of the plane. The working surface generally has a T-slot, and long holes and round holes can also be processed according to requirements. This T-slot platform uses excellent
Made of pure pure iron, thus ensuring the stability of the basic working parameters of the cast iron T-slot platform.
So how do the causes of stress deformation and cracks in the cast iron T-slot platform and castings be caused? During the cooling process of the cast iron T-slot platform and the casting, the algebra of shrinkage stress, thermal stress, phase transformation stress and the casting stress exceed the fracture resistance of the metal section to form a crack. Once stress deformation and cracks appear, their morphological characteristics are generally expressed as: hot cracks are formed at high temperature (1150 ~ 1000 ℃), showing dark brown uneven fractures. Cold cracks appear in the elastic range below 600 ℃, showing a light brown smooth and straight fracture. Above 600 ° C, the casting stress exceeds the yield to produce plastic deformation. In fact, according to the continuous exploration and progress of the casting industry, it is concluded that when the composition of the ductile iron is normal, it is not easy to crack.
Therefore, it is especially important to find the elements affecting the stress deformation and cracks of the cast iron T-slot platform: factors that increase the white mouth tendency, such as low carbon and silicon content, increased carbide forming elements, insufficient inoculation, and excessive cooling can increase Casting stress and cold cracking tendency. Phosphorus increases the tendency of cold cracking, P> 0.25% can also cause hot cracking. Cast iron T-slot platforms and castings have large wall thickness differences and complex shapes, which are prone to deformation and cracks.
After thorough research on the nature of defects in the casting process, the prevention measures for the stress deformation and cracks of the cast iron T-slot platform and castings were put on the agenda: the need to properly increase the carbon content, reduce the phosphorus content, strengthen the inoculation and casting Type technological measures. The sand falling temperature of large complex parts should be lower than 700 ℃. In addition, low temperature annealing at 500 ~ 600 ℃ can relieve stress. Two artificial annealing treatments were performed on the cast iron T-slot platform, which were in two stages before and after roughing, which has gradually replaced the previous natural aging treatment method, but instead made the cast iron T-slot platform itself more stable Promote.
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Stainless Steel Seamless Round Pipe
Stainless Steel Pipe is a kind of hollow long round steel, which is widely used in petroleum, chemical, medical, food, light industry, mechanical instruments and other industrial pipelines and mechanical structural parts. In addition, when the bending and torsion strength are the same, the weight is lighter, so it is also widely used in manufacturing mechanical parts and engineering structures. It is also used for furniture, kitchenware, etc. The hardness of stainless steel pipe is usually measured by Brinell, Rockwell and Vickers. Annealed stainless steel pipe with inner diameter of more than 6.0 mm and wall thickness of less than 13 mm. Production process of stainless steel seamless pipe A. round steel preparation; b. Heating; c. Hot rolling perforation; d. Cutting head; e. Pickling; f. Grinding; g. Lubrication; h. Cold rolling; i. Degreasing; j. Solution heat treatment; k. Straightening; l. Pipe cutting; m. Pickling; n. Finished product inspection. Common materials are 201, 304 and 316.ETC
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