Prestressed laser cladding crack suppressing method and device of shaft sleeve part

Abstract

The invention discloses a prestressed laser cladding crack suppressing method and device of a shaft sleeve part. The prestressed laser cladding crack suppressing method and device of the shaft sleevepart have the following technical effects that 1, prestressed laser cladding of the shaft sleeve part is realized; 2, the process is simple, pressure provided by a hydraulic cylinder can be detected in real time by using a digital display pressure gauge, and a complicated and expensive sensor force measuring device is omitted; 3, by adjusting a prestressing force, the surface residual stress of the laser-cladded shaft sleeve part can be regulated; and 4, through prestressing force adjusting, prestressed laser cladding cracks are reduced, and the remanufacturing service performance of the partis improved.

Description

technical field [0001] The patent of the present invention relates to the field of laser cladding remanufacturing, in particular to a prestressed laser cladding crack suppression method and device for shaft sleeve parts. Background technique [0002] Modern manufacturing has higher and higher requirements for the reliability and service life of shaft parts. Most of these parts are subjected to complex alternating stress, and some work in shock, vibration and severe corrosive environments. In the application, it is often found that the surface has cracks and damage, which will lead to fatigue failure of shaft parts and cause major accidents. Utilizing the dimensional recovery function of modern surface engineering technology, it is possible to realize the remanufacturing of failed parts and restore their original functions. According to the method used, it can usually be divided into the following types: one is to use electrode reaction to form a coating on the surface of th...

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Problems solved by technology

Related inventions have some examples, but all have essential differences with the present invention. In existing inventions, such as Fang Hongyuan of Harbin Institute of Technology; Liu Xuesong; Xu Wenli; Yang Jianguo; Fixtures with cracks" (patent application number 200610150821.9, application date 2006.09.28, publication / announcement number: 1927531A, publication / announcement date: 2007.03.14), the two-way prestress control thin plate welding deformation and cracks described in it refers to welding During the process, the longitudinal stress parallel to the weld and the transverse stress perpendicular to the weld direction are applied synchronously to control welding deformation and thermal cracks. In the vertical direction of the weld, several clamping heads are required to apply transverse extrusion strain to offset the solidification shrinkage. Cracking tensile strain, longitudinal stress is used to offset the extrusion strain of the weld and near the seam, while the crack in laser cladding is mainly caused by thermal stress and residual tensile stress caused by rapid heating, melting, and then rapid cooling , which is still very different from welding, and this patent is only suitable for thin plate processing. This fixture cannot meet the rotary motion of shaft sleeve parts, and this method is not suitable for the field of laser cladding

Another example is Peng Ruitao of Xiangtan University; Tan Yuanqiang; Tang Xinzi; Liao Miao; Zhang Cheng invented "a method and device for prestressed turning of shaft parts" (patent application number: 201210068123.X, application date 2012.03.15, open / announcement No.: CN1026152991A, date of publication / announcement: 2012.08.01) The prestressed turning mentioned in it actually refers to the prestressed force applied to the workpiece before the cutting process, and the elastic effect of the stress on the workpiece is maintained during the cutting process. During the process, the surface of the workpiece undergoes plastic deformation and is cut off. After processing, the prestress is released until the workpiece is completely cooled. Since the patent uses a force nut to apply prestress, the size of the prestress cannot be precisely controlled, and the The patent is used in the field of turning processing, and the generation of internal stress in laser cladding technology is thermal stress, which is essentially different from the thermoplastic deformation effect of cutting processing, and there is no prestressing device or technology in the field of laser cladding However, people often use to reduce the occurrence of cracks by changing the composition of laser cladding powder, cladding process, etc. The efficiency, effect and operability of these methods are very limited

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