A Plasma Cladding Process for Agricultural Wearable and Soil-Contacting Parts

Abstract

The invention relates to a plasma cladding process for an agricultural easily-abraded soil touching part. The plasma cladding process for the agricultural easily-abraded soil touching part comprises the following steps that the current of a plasma welding machine is controlled to be 10-30% of current applied during normal cladding, the surface of a clad part is preheated, and a moving route of a welding gun is a bow-type fold line B-C-F-G-J-K-N-O; and when the welding gun is moved to a starting point A, a powder feeder is opened, and the welding gun starts a moving route A-B-C-D-E-F-G-H-I-J-K-L-M-N-O-P, wherein in the step, the powder feeder is kept in an open state in the whole course, a plasma arc is started at the intervals B-C, F-G, J-K and N-O at the actual cladding length, and the plasma arc is in a closed state at the intervals A-B, C-D-E-F, G-H-I-J, K-L-M-N and O-P which are located at two ends and have the length being 20-30% of the actual cladding length. According to the plasma cladding process for the agricultural easily-abraded soil touching part, cladding boundaries achieve natural transition, no salient point is generated, and a flat abrasion-resisting layer can be formed in a cladding mode.

Description

technical field [0001] The invention belongs to the technical field of cladding treatment of agricultural machinery parts, and in particular relates to a plasma cladding process for agricultural easy-wearing soil-contacting parts. Background technique [0002] The wear and consumption of agricultural tillage parts is huge. Plasma cladding technology is a low-cost and high-efficiency method to improve the wear resistance of parts, and the market demand is broad. [0003] During plasma cladding, the surface to be clad undergoes a process of rapid cooling and rapid heating, and the temperature of the molten pool formed during cladding changes greatly. In the process of melting, solidification and cooling, the temperature of the molten pool directly affects the solidification structure and solid phase transition of the material The organizational structure ultimately determines the cladding quality. Cladding is a process of gradual accumulation from line to surface. The tempera...

AI Technical Summary

Problems solved by technology

Cladding is a process of gradual accumulation from line to surface. At the beginning of cladding, the temperature of the substrate is low. As the cladding process progresses, the temperature of the substrate continues to rise, which will inevitably lead to a certain difference in cladding quality before and after.

In addition, during the cladding, it was also found that the boundary of the cladding area is prone to bulges. This is due to the acceleration and deceleration process of the CNC workbench when changing directions, resulting in a large accumulation of metal powder, which seriously affects the smoothness of the cladding surface.

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