Optimization method of process for repairing axial surface wear part by laser cladding

Abstract

The invention discloses an optimization method of a process for repairing an axial surface wear part by laser cladding, which realizes the analysis of a nonlinear problem of a material by defining thermophysical parameters of the material changing along with temperature and ensures the reliability of an analysis process. A heat source model is defined as a body heat generation rate model, so thata molten powder heat transfer process in a coaxial powder feeding mode can be accurately simulated; by adopting an APDL programming mode under a cylindrical coordinate system, the simulation process of laser cladding on the axial surface of the part can be realized; calculation is carried out by adopting an indirect sequential thermal-structural coupling mode, advanced temperature field calculation is carried out, then stress field calculation is carried out, the number of coupling equations is small, and convergence is easy.

Description

technical field [0001] The invention belongs to the technical field of overhauling wear parts on the shaft surface, and in particular relates to an optimization method for the process of repairing the wear parts on the shaft surface by laser cladding based on ANSYS. Background technique [0002] The problem of shaft wear is a problem that often occurs in the management of production equipment in enterprises. For a long time, it is difficult for enterprises to use traditional methods to repair equipment in the face of shaft wear. Many companies often use the replacement of spare parts to deal with the problem. The disassembly of spare parts is not only expensive , The workload is heavy, and the inventory of a large number of spare parts brings great pressure and invisible economic losses to the company's cash flow. The traditional repair welding machine processing method is easy to cause material damage, resulting in deformation or fracture of parts, which has a large Limitat...

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Problems solved by technology

[0002] The problem of shaft wear is a problem that often occurs in the management of production equipment in enterprises. For a long time, it is difficult for enterprises to use traditional methods to repair equipment in the face of shaft wear. Many companies often use the replacement of spare parts to deal with the problem. The disassembly of spare parts is not only expensive , The workload is heavy, and the inventory of a large number of spare parts brings great pressure and invisible economic losses to the company's cash flow. The traditional repair welding machine processing method is easy to cause material damage, resulting in deformation or fracture of parts, which has a large Limitations: The method of brush plating and spraying and then machining often requires outsourcing, not only the repair cycle is long and the cost is high, but also because the repair material is still a metal material, it cannot fundamentally solve the cause of wear, that is, the impact resistance of the metal and The concession is poor; many parts can only be scrapped and replaced, which greatly increases production costs and spare parts in stock, and makes the company's good resource advantages idle and wasted. Therefore, choosing laser cladding to repair the size of the worn parts on the shaft surface is A better choice, laser cladding on the worn axial surface is a manufacturing process that uses the laser cladding process to form a dense metal coating based on metallurgical fusion on the damaged axial surface to restore its shape, size and performance. The cladding process is affected by time-varying high-temperature thermal cycles and the thermophysical properties of heterogeneous material substrates and powders. Its forming mechanism is very complicated. If it is not properly controlled, it will affect the manufacturing quality and even produce defects such as microcracks.

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