Abstract
In the internal thread extrusion forming, if the process parameters are not selected properly, the extrusion torque will increase, the extrusion temperature will be too high, or even the tap will break. In order to obtain effective process parameters under certain working conditions, this paper uses a combination of numerical simulation and process experiment to analyze the influence of the bottom hole diameter, extrusion speed, and friction factor on the extrusion torque and extrusion temperature. Through an orthogonal experiment, the significant influence law of different process parameters on the extrusion torque and extrusion temperature was studied, and the order of their influence was determined. Based on the optimal process parameters, numerical simulations and process tests were carried out, and the extrusion effect and related parameters were compared and analyzed. The results show that the extruded thread has clear contour, uniform tooth pitch, complete tooth shape, and good flatness. Compared with before optimization, the maximum extrusion torque has been reduced by 37.15%, the maximum temperature has been reduced by 29.72%, and the extrusion quality has been improved. It shows that the optimized method and optimized process parameters have good engineering practicability.
Highlights
In recent years, China has vigorously developed the equipment manufacturing industry, such as rail transit equipment, automobiles and parts, machine tool manufacturing, robots, etc., and it has developed many new equipment and machines, among which threaded connections are indispensable; its performance is directly related to the service life of related equipment
It can be seen that when the internal thread is extruded at different extrusion speeds, the overall can be that when the internal thread is extruded at different speeds, the overall changeIttrend of seen the extrusion torque remains unchanged, and both increaseextrusion at first and decrease
It can be seen that when the internal thread is extruded at different extrusion speeds, the overall change trend of the extrusion torque remains unchanged, and both increase at first and decrease
Summary
China has vigorously developed the equipment manufacturing industry, such as rail transit equipment, automobiles and parts, machine tool manufacturing, robots, etc., and it has developed many new equipment and machines, among which threaded connections are indispensable; its performance is directly related to the service life of related equipment. In the extrusion molding process, the metal fiber is not cut, the thread surface structure is fibrous and distributed along the tooth shape, and there is a certain hardened layer and residual compressive stress on the tooth root surface It has better comprehensive performance and better performance than machined threads, as well as a large carrying capacity [1,2]. Extrusion processing can effectively improve the strength and hardness of internal threads, extend their service life, and have high processing accuracy and good surface quality. It has become the first choice for Materials 2020, 13, 3960; doi:10.3390/ma13183960 www.mdpi.com/journal/materials. Process of internal threads; Miu Hong, and explored the key technologies affecting the cold extrusion process internal threads; Miu. Min [4–10], and others conducted experiments on Q460, 300 Mofhigh-strength steel, and they.
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