Loom With Failure Analysis And Mechanical Properties NP5400 Electronic Dobby Device Reading Arm Strengthening

The electronic dobby shedding device is a new kind of power plant, it is widely used in many kinds of textile machinery for high speed, high stability, low noise, long life and so on. But the production level and manufacturing process is not advanced, the failure of key parts of textile machinery will lead equipment to stop work. The failure of the reading arm in NP5400electronic dobby shedding device for a company was analyzed in the dissertation, the results indicated that the main reason of fracture reading arm was caused by the problem of heat treatment process. The induction hardening process of reading arm was simulated by ANSYS software. The heat treatment processes of reading arm were optimized by the results of failure analysis for reading arm and simulation. The main research work and results obtained in this dissertation were as follows:1. The machining process of reading arm was analyzed in details by the actual working condition. The reasons for failure fracture were analyzed by chemical analysis, metallographic analysis, fracture morphology analysis and hardness analysis. The main reasons for causing reading arm fracture failure are high Si content, micro cracks, quenching medium and quenching crack and so on. The problem of frequency induction hardening heat treatment process was the main failure reasons.2. The induction hardening process was optimized by ANSYS simulation to get the distribution of temperature and stress field with the strength calculation results of reading arm. The results indicated that the hardened zone was adjusted and hardness gradient was distributed by quenching time and position. The transition zone hardness was easily to got between the hardened area and the base body, the strength and toughness of reading arm was improved to meet the design requirements.3. The heat treatment processes of reading arm were optimized by the failure analysis and ANSYS simulation. The normalizing process was adopted, the quenching medium and time was adjusted and so on. The structure of quenching inductor was designed to meet the requirements of heat treatment process. The mechanical properties of the reading arm were improved by the analysis of fracture surface morphology, metallographic, hardness test and so on. 4. The residual stress in hardening zone of reading arm was contrastive analyzed by XRD method. The results showed that residual stress was compressive stress, the residual compressive stress was improved with the optimized induction hardening process. The tensile strength and wear-resisting performance are the most important mechanical properties of reading arm. It concluded that the average maximum tension of reading arm was7.08KN, which was higher than the designed values with heat treatment processes optimized. The wear-resisting performance was more stable and increased by20～35%with the heat treatment process optimized...