High-performance surface composite strengthening method for shaft parts

Abstract

The invention discloses a high-performance surface composite strengthening method for shaft parts, and belongs to the field of surface machining of metal materials. The surface composite strengtheningmethod comprises the following steps that S1, carrying out radial vibration turning on the shaft parts, and forming a specific regular distributed micron scale/nano scale microcosmic geometrical morphology on the surfaces of the shaft parts; S2, coating the surfaces; and S3, carrying out mechanical reinforcement treatment on the coating surfaces by adopting an ultrasonic rolling processing technology. Compared with the prior art, the high-performance surface composite strengthening method for the shaft parts can greatly improve the bonding strength of a bonding interface of a base material and a coating layer, meanwhile, the hardness, the fatigue strength and the wear-resistant and corrosion-resistant shaft parts of the final forming surfaces are improved, and the method has good popularization and application values.

Description

technical field [0001] The invention relates to the field of surface processing of metal materials, and specifically provides a high-performance surface composite strengthening method for shaft parts. Background technique [0002] In order to improve the tribological properties of shaft parts, improve their anti-corrosion performance, or improve their construction process, surface treatment of shaft parts has become a routine treatment method, and surface coating is one of the most common methods. Coating methods such as electroplating, electroless plating, laser cladding, ion-assisted coating, cold spraying, thermal spraying, chemical vapor spraying, physical vapor spraying, physical vapor deposition, etc. [0003] The electroless plating technology is a plating method that reduces the metal ions in the plating solution to metal and deposits them on the surface of the part with the help of a suitable reducing agent without an external current. Compared with electroplating,...

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Problems solved by technology

However, both electroless plating technology and physical vapor deposition technology have the following disadvantages: first, the film / substrate bonding force is weak, and the film layer is prone to fall off, resulting in component failure; second, the surface roughness after coating is high, and there are Residual tensile stress, resulting in poor mechanical properties of components and short service life

However, the above method is to strengthen the final forming surface after the coating process by using plastic strengthening processes such as ultrasonic rolling to improve surface roughness and residual stress distribution. However, there is still the problem of insufficient coating film / base bonding force. However, the post-strengthening treatment under the condition of insufficient film / substrate bonding force is often prone to the problem of film layer sliding or microscopic cracks.

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