Electric upsetter capable of realizing process parameter optimum control

Abstract

The electric upsetter includes mechanical mechanism, heating mechanism, detection mechanism, and control mechanism. The mechanical mechanism includes upsetting cylinder, upsetting block, smithy cylinder, smithy block and conducting holding cylinder; the heating mechanism includes holding electrodes and transformer; the detection mechanism includes displacements mounted on the upsetting cylinder and the smithy cylinder separately; and the transformer is controlled with an electronic unit and continuously controlled output voltage. Based on the plastic mechanics and thermodynamic principles, the calculation method of heating current, upsetting pressure, speed and other technological parameters is given; and by means of the continuous closed loop control of speed, pressure, temperature and current, the optimal control of the electric upsetting process is realized.

Description

1. Technical field: [0001] The invention is an intelligent electric upsetting machine, in particular an electric upsetting machine for electrothermal upsetting of engine valves, which belongs to the innovative technology of mechatronics. 2. Background technology: [0002] At present, the intelligence level of electric upsetting machines is low, and the process parameters such as heating current, upsetting pressure, and speed can only be determined by experience in production. The main problems are as follows: (1) Each process parameter (pressure, speed, voltage, etc.) ) is a preset constant in a single working cycle, and parameter optimization cannot be realized; (2) After the working conditions (temperature, wear, blank quality, etc.) change during the working process, the system cannot automatically change to adapt to the changes in working conditions, To ensure the quality of the product; (3) Every time a product is replaced, the process parameters must be readjusted and ...

AI Technical Summary

Problems solved by technology

[0002] At present, the intelligence level of electric upsetting machines is low, and the process parameters such as heating current, upsetting pressure, and speed can only be determined by experience in production. The main problems are as follows: (1) Each process parameter (pressure, speed, voltage, etc.) ) is a preset constant in a single working cycle, and parameter optimization cannot be realized; (2) After the working conditions (temperature, wear, blank quality, etc.) change during the working process, the system cannot automatically change to adapt to the changes in working conditions, To ensure the quality of the product; (3) Every time a product is replaced, the process parameters must be readjusted and explored, which not only wastes time, but also causes a lot of waste products, and often occurs overheating, overburning, folding, skewing, cracks, etc.

For this reason, many manufacturers and scientific research institutions at home and abroad have taken great pains and done a lot of work, such as the "parameter analysis and microcomputer control of valve electric upsetting process" disclosed by Yin Ximeng and others in "Forging Technology" 1986 / 4; The "learning-based expert control system for electric upsetting machines" disclosed by Liu Jingyu and others in "Electrical Automation" 1999 / 2; the "group control system for electric upsetting machines" disclosed by Yang Qingyun in "Forging Technology" 1990 / 3; The introduction of automatic control has played a certain role in improving the quality of products, but they also have some shortcomings, such as: discontinuous control, only control part of the electric upsetting process parameters or separation of data acquisition and control, so it is difficult to ensure the quality of control, the most critical Unfortunately, they failed to achieve the optimization of process parameters

Images