The rolling method is a plastic processing process, which makes the metal body plastically displace without destroying the metal fiber, so that no metal is formed by the chip, which can improve the mechanical properties of the thread to be processed, and greatly saves the economy. Special materials for aerospace parts. Because the parts in the aerospace industry generally use high-temperature alloys with high thermal strength, good thermal stability and high corrosion resistance, titanium and its alloys, stainless steel and other materials. The remarkable characteristics of these materials are high specific strength, good thermal strength, good corrosion resistance, high chemical activity, poor thermal conductivity and small elastic modulus. All of them are difficult to process materials, and their cutting characteristics are characterized by small deformation coefficient and cutting. Large deformation, high work hardening tendency, large cutting force, high cutting temperature, easy tool wear, surface quality and accuracy are not guaranteed. Aerospace parts are available in a variety of forms, and threading is an important form of connection. Commonly used threaded joints are widely used MJ reinforced threads, the external threaded workpiece bottom is required to increase the arc of the reinforcing thread, and after quenching and rolling the thread, the use of such a thread can obtain higher bolt mechanical properties. Aerospace MJ's best solution for strengthening external threads For aerospace titanium alloys and high-temperature alloy MJ reinforced external threads, general-purpose tools can not meet the requirements of parts, but need to provide the best processing solutions from design, manufacturing, etc., which involves selecting tool materials and improving Tool technology, choose the right cutting speed, etc. The rolling method is a plastic processing process, which makes the metal body plastically displace without destroying the metal fiber, so that no metal is formed by the chip, which can improve the mechanical properties of the thread to be processed, and greatly saves the economy. Special materials for aerospace parts. After the externally threaded parts are subjected to rolling plastic deformation, the strength and hardness are improved, and the plasticity is reduced. The metal fibers of the threaded portion are not cut, but the deformation is performed along the thread form. After rolling the parts and materials, the material is relatively dense, and the surface produces a cold hardened layer, and there is residual compressive stress, so the wear resistance of the parts after rolling is greatly improved, and the fatigue strength of the thread can be increased by 20%~40. %. Rolled parts, the surface roughness of the thread is also greatly improved, and the excellent surface quality can improve the cycle strength of the thread. After the plastic deformation of the material, the strength becomes higher and higher with the increase of the degree of deformation. Therefore, the tensile strength of the rolled thread can be increased by 20% to 30%, and the shear strength is increased by 5%. Meanwhile, MJ is strengthened. The external thread has higher requirements on strength, and the method of rolling the thread by the principle of metal plastic deformation better solves the problem that the bottom of the tooth is enlarged arc. Therefore, the best tool for machining aerospace enterprises' titanium alloy and superalloy MJ to strengthen externally threaded parts should use a rolling wheel. Design and use points of the rolling wheel 1 Titanium alloy, high temperature alloy MJ external thread features (1) Part materials are usually difficult to machine materials such as titanium alloys and superalloys. (2) The only difference between the thread and the ordinary thread is that the external thread adopts a large arc bottom, and the root is a continuous and smooth curve. The radius of the arc on the curve is 0.18P. (3) The thread precision is higher. The tolerance belt is 4h6h and 4g6g. In the medium diameter tolerance range, the pitch error, half angle error, roundness error, taper error and any other medium diameter corresponding to the error of the thread shape. The sum of the equivalents shall not exceed half of the medium diameter tolerance. The pitch limit deviation ΔP = 0.4Td2 / 1.7321, and the half angle limit deviation Δa / 2 = arctan (0.3Td2 / 1.125P). Next page
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