At present, the main method for producing flange nuts in our factory is to use cold bars to pass the cold extrusion of the wool, and then through the post-processing. Due to the large size of some products, the method of cold extrusion of blanks with solid rods is limited by the tonnage of the press, which brings certain difficulties to production. Therefore, at the end of 1998, we began to study the cold extrusion of large flanged nut blanks with seamless steel tubes on the basis of solid bar cold extrusion blanks, and successfully completed the trial production of large flange nuts as shown in early 1999. .
1 Process of cold extrusion of large flange nut blank with seamless steel pipe 1.1 Process route: Preparation material - blanking - spheroidizing annealing ※ Phosphorus, saponification treatment ※ Cold extrusion of blank blank processing ※ Finished product.
1.2 Determination of the size of the seamless steel pipe The inner and outer diameters of the seamless steel pipe can be based on the flange diameter and internal thread specifications of the part and the deformation conditions (the allowable deformation degree e 1.3 the design of the die design of the mold as shown, in order to It is convenient to remove the part from the punch and process the 2* cone on the punch core. The die is designed according to the external dimensions of the part.
2 The process of cold-squeezing a large flanged nut blank with a seamless steel pipe and the cold extrusion process with a solid bar is basically the same as that of a cold-extruded flange nut with a seamless steel pipe, but less in the subsequent processing. The drilling process, which significantly increases productivity.
2.2 The compression force from the forming of the part and the comparison of the usual pressing force on the equipment are calculated by the following formula.
In this way, it can be seen that the squeezing force of the large-scale flanged nut with a seamless steel tube is much smaller than that of the squeezing force with a solid bar (calculated by about 1.5 times). Since the total pressing force is the main basis for selecting the tonnage of the press, it can also be seen that the same type of flange face nut is squeezed, and the tonnage of the used equipment is often squeezed with a seamless steel pipe. The equipment used is much larger, so the process of extrusion with a seamless steel pipe has a much higher utilization rate than that of a solid bar.
2.3 Comparison from the service life of the mold Due to the relative reduction of the cold extrusion force, the force acting on the mold is also relatively reduced, so that the service life of the mold is higher.
3 Feasibility of the process Since the price of the seamless steel pipe is much higher than the price of the solid bar of the same material, the cost of the raw material is increased, but from the comparison of the above two processes, the large-scale method of extruding the seamless steel pipe The blue nut process reduces the number of processes and improves the production efficiency. At the same time, the mold life is greatly improved, the mold consumption cost is reduced, and the production cost of the parts is reduced. After analyzing and calculating the production cost of extruding a large flange nut with a seamless steel pipe and compacting it with a solid bar, the process is feasible.
4 Conclusion After nearly two years of production verification by our factory, the small and medium-sized flange nut is more suitable for extrusion with solid bar material. The large-size flange nut is more suitable for extrusion with seamless steel pipe. All in all, the production of flange nut by cold extrusion is a relatively advanced process in China. It does not require a large amount of money to purchase special production equipment, and can be carried out in large quantities under the premise of a press. Production, it is a technology that is easier to promote in the country.
Shanghai: Shanghai People's Publishing House, 1976 Shanghai Jiaotong University. Cold extrusion process and mold catalogue. Beijing: Mechanical Industry Press, 1976 Japan developed a new technology to improve the strength of stainless steel by powder metallurgy. A researcher at a university in Japan has developed a new technology to improve the strength of stainless steel. The technology is to first re-crush a commercially available stainless steel powder using a powerful pulverizer and apply a strong twist. Then, stainless steel powder was charged into a mold and sintered at a high temperature of 800*C. This technique is actually an unbalanced powder metallurgy method used to make precision materials. When stainless steel is produced by this method, the material begins to crystallize at room temperature, and the crystallite grains in the material after sintering are smaller than those in ordinary stainless steel, which is the key to its high strength. Compared with ordinary stainless steel, the performance of stainless steel made by the new technology is obviously improved, the tensile strength is 2.2 times, and the bending strength is 3.4 times.
Excerpted from "Shanghai Jinyu"
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