Temperature Control Of Vacuum Heat Treatment Furnace

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Shanghai Gegang Vacuum Technology Co., Ltd. is a manufacturer with many years of production, design and research and development of vacuum heat treatment. The following is the vacuum heat treatment furnace temperature control method summarized according to many years of experience.

Key methods of temperature control in vacuum heat treatment:

First, vacuum heat treatment furnace temperature control system and temperature control accuracy for zero point one percent of the intelligent temperature control instrument, computer control program control according to the product process curve of vacuum furnace heating, heat preservation, cooling process, the operation of the temperature control instrument, stop automatic control by a PC, implementation process technical requirements of temperature control curve.

Second, the temperature control system can be set, store multiple temperature control curves, each curve can be divided into multi-section control, each temperature control curve has optional PID parameters, self-tuning function, to ensure no temperature overshoot, the system can be suitable for a variety of indexing thermocouple and preset temperature temperature insulation curve.

Third, the temperature controller output 4-20mA current signal to the triggering unit, the triggering unit to change the current signal into voltage signal, the output control of the DC voltage and current of the excitation loop, so as to control the magnetic voltage and current, to ensure that the vacuum heat treatment furnace heating and insulation according to the set curve.To complete the temperature control, the sensing and control technology of the temperature under vacuum is one of the key technologies of the vacuum heat treatment process and equipment. The process of using the vacuum heat treatment furnace must be well mastered.

Then the abnormal temperature of vacuum heat treatment furnace, including high temperature alarm, can not reach the expected value, what should we do?

First, check whether the thermocouple in the corresponding working area of the vacuum heat treatment furnace is damaged.To see these thermocouples, connect the thermocouple on the thermostat to the thermostat and investigate the temperature appearance.If the thermocouple is indeed damaged, it is necessary to replace it.If there is no problem with the thermostat and thermocouple, it is necessary to test whether the heating tube operates normally.

Second, if the vacuum heat treatment furnace is too high temperature alarm failure, then we first check whether the constant temperature parameters of the operation area are normal, refer to all the parameters of other normal use of the thermostat proof.According to the circuit diagram to check whether the output of the solid-state relay in the corresponding operation area is broken down, the method is: power off, use the multimeter resistance to measure the solid-state relay output resistance between two points, the normal resistance will reach a few megawatts or higher, if it is a breakdown, there is almost no resistance, it is necessary to replace the new type of the same type.

Third, in the case of the vacuum heat treatment furnace starting power, the hand vibrates the corresponding operation area of the thermocouple probe to check whether the corresponding thermostat shows a wide range of beating. If this phenomenon occurs, the thermocouple probe is not in good contact, and a new one needs to be replaced. If the apparent temperature of the vacuum heat treatment furnace is lower than the set value and the same, firstly check whether the temperature controller parameters in the working area are normal and whether there is an output signal.

Editing by Frank Lee

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