Method for controlling temperature of copper brazing furnace

A temperature control method and temperature control technology, applied in the direction of manufacturing tools, welding equipment, welding/welding/cutting items, etc., can solve the problems of overshoot, PID parameters can not be obtained, etc., to achieve no cleaning, fast welding speed, welding good quality effect

Inactive Publication Date: 2016-01-06
YANCHENG INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Since there is a first-order time-delay temperature object with a large time lag in the temperature control process of the copper brazing fur

Method used

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  • Method for controlling temperature of copper brazing furnace
  • Method for controlling temperature of copper brazing furnace
  • Method for controlling temperature of copper brazing furnace

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Embodiment Construction

[0024] The temperature control method of copper brazing furnace is to convert 380V AC into DC through three-phase bridge rectification and filtering, and use the DC as the power supply for heating resistors, and then use the power inverter to convert the DC into AC with different amplitudes. The first power supply, the second power supply, the third power supply, the fourth power supply, the fifth power supply, and the above six power supplies are superimposed to form the total power supply of the heating resistor. The temperature in the copper brazing furnace is detected by PLC, and then Analysis and judgment control the number of heating resistor power supplies connected. The direct current is composed of 6 diodes to form a three-phase bridge rectifier circuit, and a ∏ filter circuit is formed through a capacitor and an inductance.

[0025] The amplitude of the first AC power supply is 280, and the frequency is 50Hz;

[0026] The amplitude of the second AC power supply is 1...

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Abstract

The invention discloses a device for controlling the temperature of a copper brazing furnace. A direct-current power source supplies heating resistors distributed in the copper brazing furnace. 380 V alternating currents are converted into direct currents by means of three-phase bridge rectifier filters. The direct currents serve as the power source of the heating resistors, then the direct currents are inverted into the alternating currents which are the same as the direct currents in frequency but different in amplitude through a power inverter, the alternating currents serve as a first power source, a second power source, a third power source, a fourth power source and a fifth power source, and the six power sources are superimposed to form a total power source of the heating resistors. The temperature inside the copper brazing furnace is detected through a programmable logic controller (PLC), and then the power source of the heating resistors is analyzed, judged, controlled and switched in. According to the method, the influences of environmental changes on the temperature of the copper brazing furnace are avoided by means of the effective control over the power source, and it is guaranteed that the temperature in the copper brazing furnace is constant.

Description

technical field [0001] The invention belongs to the field of temperature control of copper brazing furnaces, in particular to a method for controlling the temperature of copper brazing furnaces. Background technique [0002] Copper brazing technology uses special brazing alloys of copper, tin and phosphorus to braze brass and red copper into tubes and heat dissipation strips into a high-strength metal whole. It uses extremely thin copper alloy solder to place near or inside the welding surface of the part that needs to be connected. After installation and drying, the parts are heated under the protection of a certain inert atmosphere to spread between the molten metal of the brazing alloy and the non-melting metal. After cooling, the brazing filler metal forms a metallic bond with the contact surface of the component. [0003] Copper brazing technology uses extremely thin copper alloy material, which has good thermal conductivity, high strength and high softening point. Mo...

Claims

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Application Information

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IPC IPC(8): B23K3/04B23K1/008B23K1/19B23K103/12
CPCB23K1/008B23K1/19B23K3/0478
Inventor 纪正飚王正刚周海
Owner YANCHENG INST OF TECH
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