Working principle of vacuum brazing furnace equipment

Vacuum brazing furnace is a mechanical equipment that uses copper welding wire to heat and melt to complete welding. Do you know the working principle of vacuum brazing furnace? Today, let's learn about the vacuum brazing furnace with Bian Xiao!
The working principle of a vacuum brazing furnace is to apply flux to the welding position of the cleaned and decontaminated product workpiece, sprinkle welding materials (powder, particles, flakes), and then place another part to be welded (the welding surface is also coated with flux). After the two parts are positioned and fixed, they are placed in the furnace and heated to the melting temperature of the welding material to complete the welding. It uses the furnace temperature to increase the temperature of the product workpiece, Melt the welding material with a melting temperature lower than the product workpiece, allowing the product workpiece to be welded.
Vacuum brazing furnace is a large-scale mechanical equipment used for heat treatment, which can complete vacuum brazing, vacuum annealing, vacuum aging and other processing. It can be programmed with various different programs, and hundreds of heat treatment curve points can be controlled and programmed. The temperature is controlled in six zones, including up, down, left, right, front, and back. There are multi-point and single point temperature recorders and overtemperature protection mechanical equipment, and the furnace temperature uniformity can be controlled within a constant temperature range. In addition, There are also high-purity nitrogen with high flow rate and strong cooling mechanical equipment.
The machine vacuum system mainly consists of a vacuum chamber, a pump system, a control valve, and a heat exchanger. The pump system consists of a mechanical pump, a maintenance pump, a Roots pump, and a diffusion pump. The valve consists of a front valve (butterfly valve), a bypass valve (butterfly valve), a maintenance pump valve (butterfly valve), and a high-level valve (flat valve), all of which are pneumatic valves controlled by PLC. The heating chamber mainly consists of a stainless steel heating chamber shell, stainless steel reflection screen, heater, ceramic insulator, water-cooled electrode, furnace, etc.
When the vacuum brazing furnace is running, first start the mechanical pump, maintenance pump, and diffusion pump (heating). At the same time, open the front lock valve and maintenance pump valve to vacuum the diffusion pump. When the system vacuum reaches a certain set value, the Roots pump starts, the bypass valve opens, and the bottom valve closes. At this time, the vacuum chamber is vacuumed. When the diffusion pump is heated to the specified temperature and the vacuum degree is higher than the specified value, the high valve opens, the bypass valve closes, and the bottom valve opens. At this time, before the heat treatment can be completed, the vacuum chamber is vacuumed to achieve the required vacuum degree for the process. After the heat treatment is completed, high-purity nitrogen is filled into the vacuum chamber through the heat exchanger to complete forced cooling and complete the entire process.