Post-treatment method of high-strength durable rolling external thread part

Abstract

The invention mainly relates to the technical field of machining of mechanical parts, and discloses a post-treatment method of high-strength durable rolling external thread parts. The post-treatment method comprises the following steps of cleaning, heating, carbonitriding, sulfurizing, quenching, tempering and coating; According to the post-treatment method of the high-strength durable rolling external thread parts, after the rolling external thread metal parts are subjected to post-treatment, the obtained parts are high in hardness, high in wear resistance and corrosion resistance, capable ofdelaying thread abrasion during a long-term use process, good in sealing effect, and capable of being widely applied to precise instruments, so that the application range of the rolling external thread parts are expanded.

Description

technical field [0001] The invention mainly relates to the technical field of mechanical parts processing, in particular to a post-processing method for high-strength and durable rolled external thread parts. Background technique [0002] The thread is a helical continuous convex part with a specific cross section made on the surface of the cylindrical or conical parent body; the thread is divided into cylindrical thread and conical thread according to the shape of the parent body; according to its position in the parent body, it is divided into external thread, Internal thread; according to its cross-sectional shape (tooth shape), it is divided into triangular thread, rectangular thread, trapezoidal thread, zigzag thread and other special shape threads; mold method, rolling method, thread rolling method are usually used in the thread preparation process , thread rolling method, cutting method, thread milling method, thread grinding method, thread grinding method, tapping an...

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Problems solved by technology

[0002] The thread is a helical continuous convex part with a specific cross section made on the surface of the cylindrical or conical parent body; the thread is divided into cylindrical thread and conical thread according to the shape of the parent body; according to its position in the parent body, it is divided into external thread, Internal thread; according to its cross-sectional shape (tooth shape), it is divided into triangular thread, rectangular thread, trapezoidal thread, zigzag thread and other special shape threads; mold method, rolling method, thread rolling method are usually used in the thread preparation process , thread rolling method, cutting method, thread milling method, thread grinding method, thread grinding method, tapping and threading method and turning method; the rolling method is to use a forming rolling die to deform the workpiece to obtain the thread processing The method is suitable for mass production of external threads of standard fasteners and other threaded joints, and the surface roughness of the thread prepared by the rolling method is small, and the precision is high, which can be used for precision instruments, but the rolling thread requires workpiece materials The hardness does not exceed HRC40. Higher hardness will cause great difficulties in the preparation of rolled threads, but lower hardness will cause thread wear of parts after a period of use and shorten the service life of parts. Therefore, it is necessary to roll threaded parts post-processing after fabrication to improve part strength and durability

[0003] The existing patent document CN1718992 discloses a method for surface treatment of the internal thread of the stainless steel oil pipe coupling. It is used as a pretreatment method for metal coating, which can improve the bonding ability between metal and coating layer. In the patent document, various treatment methods are used to improve the anti-sticking ability of internal threads, and the effect on metal strength enhancement is not ideal.

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