Temperature cascade control method of vacuum degreasing sintering furnace in metal powder injection molding

Abstract

The invention relates to a vacuum degreasing sintering furnace in metal powder injection molding, and discloses a temperature cascade control method of the vacuum degreasing sintering furnace in the metal powder injection molding. A main regulator performs automatic calculation according to input values of SV1 and PV1, then the output value of the main regulator is used as a set value SV2 of an assistant regulator, the assistant regulator performs automatic calculation according to the SV2 and the detected temperature value PV2 of an assistant circuit system, heating power needed by a heating body is calculated, power percent output is performed by a power controller according to heating power, the power controller controls heating power of the heating body through the output, and the PV1 and the SV1 are made to be approximate. According to the method, the heating power of the heating body in the sintering furnace body is controlled with the temperature cascade control method, and the true temperature of a product is displayed; dynamic characteristics in the process are improved, following performance of the temperature is improved, and the method is favorable for improving the process and saving working hours; secondary disturbance entering the assistant circuit system can be fast overcome.

Description

technical field [0001] The invention relates to a metal powder injection molding vacuum degreasing sintering furnace, in particular to a temperature cascade control method for a metal powder injection molding vacuum degreasing sintering furnace. Background technique [0002] The temperature control design of general metal powder injection molding vacuum degreasing sintering furnace is as follows: figure 1 As shown, the interior of the sintering furnace body 1 is provided with an insulating material 9 and a heating element 2, the material box 3 is placed in the middle of the sintering furnace body 1, and the material box 3 is provided with a material plate 4 for placing the product 5, and a thermocouple 6 Set outside the material box 3. works like figure 2 As shown, a single-loop control system is adopted, in which SV is the temperature setting value, PV is the actual temperature monitoring value of thermocouple 6, and the PID of the regulator performs automatic calculatio...

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Problems solved by technology

[0005] The present invention aims at the disadvantages in the prior art that the temperature inside the material box cannot be truly displayed, and the waiting time for heating needs to be estimated artificially, and the accuracy is not high, resulting in a decrease in product performance. The temperature cascade control method of the metal powder injection molding vacuum debinding sintering furnace

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