PRODUCT CATEGORIES

Vacuum Heat Treatment Furnace

Vacuum Sintering Furnace

Vacuum Brazing Furnace

Comparison of Furnace Types and Functions of SIMUWU Vacuum Furnace

Model	Basic Function	Structure Brief	Feature
RVS-335-D 1600c NdFeB Vacuum Sintering Furnace	Vacuum sintering Furnace suitable for vacuum sintering for NdFeB magnetic materials , meanwhile ,for sintering,annealing and aging treatment of all kinds of alloy materials, work pieces(Tungsten, molybdenum, niobium, tungsten, copper alloy etc.), hydrogen storage alloy, active and refractory metals and so on.	Composed of furnace body, heating chamber, vacuum system, dewaxing system, electronic control system, air charging system, water cooling system, pneumatic system, temperature measurement system and feeding system.	In addition to being used for NdFeB sintering operations, it also has the function of sintering alloy devices, as well as part of the heat treatment function and the dewaxing function.
RVS-4411-S 2400c Vacuum Debinding&Sintering Furance for Silicon Carbide （non-standard）	It is mainly used for high temperature fine ceramic material silicon carbide sintering in a vacuum without pressure under the atmosphere of nitrogen or argon at an ultra-high temperature of 2400℃.	Composed of furnace body, heating chamber, vacuum system, dewaxing system, electronic control system, air cooling system, air charging system, water cooling system, pneumatic system, temperature measurement system and feeding system.	Non-standard customized vacuum furnace, suitable for ultra-high temperature of 2400 ℃. Dedicated to the sintering of silicon carbide ceramics.
RVT-446 900Vacumm Tempering Furnace	Mainly used in heating treatment and aging treatment of a variety of alloy materials, devices (tungsten, molybdenum, niobium, tungsten, copper alloy, etc.), magnetic materials, electrical steel, magnetic alloy, stainless steel, heat-resistant alloys, copper and its alloys, hydrogen storage alloy, active and hard molten metal. It can also be used for vacuum sintering of magnetic material, diamond, hydrogen storage material reduction.	Composed of shell, heating chamber, vacuum system, electrical control system, cooling system, gas inflation/deflation system, water cooling system, pneumatic system, temperature measurement system and feeding mechanism, etc.	The temperature required for tempering is relatively low, but there are high requirements for temperature uniformity. Simple structure and environmental friendly.
RVGQ-669 10bar Vacuum Gas Quenching Furnace	Applied for cool work &hot work steel, high speed steel, tool steel material vacuum quenching, tempering and solution-ageing process. The work piece can keep bright and minimal deformation after heat treatment.	Composed of furnaceshell(pressure vessle), heating chamber, vacuum system, electrical control system, cooling system, gas inflation/deflation system, water cooling system, pneumatic system, temperature measurement system and feeding mechanism, etc.	The gas quenching system requires a higher temperature and is equipped with a rapid cooling air duct cooling sytem.
RVB-121220L-AL AMS2750 Standard 13 temperature zone temperature measurement aluminum heat exchanger brazing furnace	It is mainly used for vacuum brazing of aluminum based materials and all kinds of tube-fin and bar-plate full-aluminum heat exchangers, after the processing, the work pieces will have the bright surface and no oxidation.	Assembled by Furnace shell, heating chamber, vacuum system, magnesium collector, control system, water cooling system, inflation system, pneumatic system, temperature measurement system, & feeding system.	The temperature needs to be up to the standard of the solder. Larger workpiece sizes require larger furnace dimensions. Higher requirements for vacuum and temperature control

Basic parameter comparison

Model	RVS-335-D	RVT-446	RVS-4411-S	RVGQ-669	RVB-121220L-AL
Furnace type	Single chamber, horizontal type, single door，circle heating chamber	Single chamber, horizontal type, Front loading	Single chamber, horizontal type, double door，Rectangle heating chamber	Horizontal, Circular single chamber, inner circulation	Horizontal type, Front & back door
Usage	Vacuum Sintering of NdFeB Magnetic Materials	Vacuum tempering, low temperature vacuum heat treatment	Ceramic material silicon carbide vacuum sintering	Heat treatment such as vacuum quenching, tempering and solid solution aging	All-aluminum heat exchanger brazing
Working Zone（mm）	300(W)300（H） 500（L）	400(W)400（H）600（L）	400(W)400（H）1100（L）	600(W)600（H）900（L）	1200(W)1200(H) 2000(L) Maximum load size
Loading capacity	100kg	200kg	250kg（depending on the shape of workpiece）	500kg（with jigs/fixture）	3ton（with jigs/fixture）
Ultimate vacuum(empty cold)	10^-4Pa	5×10-²mbar	6.7×10^-3mbar (6.7×10^-1Pa)	6.7×10^-1mbar	6.7×10^-6mbar
Working vacuum					1×10-5mbar
Pressure rising rate(empty cold)	≤0.4Pa/h	≤0.67Pa/h	≤0.67Pa/h	≤0.67Pa/h	≤6.7×10-3mbar/h
Max. Temperature	1600℃	950℃	2400℃	1350℃	750℃
Working temperature	Depend by need	900℃	2300℃	500-1300℃	RT-700℃
Temperature rising speed(Empty)	20℃/min	5-20℃/min	20℃/min	≤60min（cold empty furnace to 1200℃）	20℃/min
Uniformity temperature(empty cold, 1000℃)	≤±5℃	≤±5℃	≤±5℃	≤±5℃	±1℃
Heating area quantity	1	3	1	1	11
Power supply	380V(±5%) 3Phase 50HZ	415V(±5%) 3Phase 50HZ	380V(±5%) 3Phase 50HZ	415V(±5%) 3Phase 50HZ	380V(±6%) (3 phase) 50HZ
Cooling Speed		≤60min（from empty furnace 800℃ to 50℃）		≤60min（from empty furnace 800℃ to 50℃）
Heating element	high temperature Molybdenum heating belt	Cr20Ni80 alloy belt	graphite felt heat insulation screen	Graphite	Nickel chrome belt. Size:20mmW 4mm thickness
Heating power	80KW	90KW	290KW	190KW	230KW
Temperature control model	Intelligent programmable temperature controller automatically controls the temperature	Intelligent programmable temperature controller automatically controls the temperature	Intelligent programmable temperature controller automatically controls the temperature	Intelligent programmable temperature controller automatically controls the temperature	Intelligent programmable temperature controller automatically controls the temperature
Control model	PLC / Manual interlock protection control	PLC / Manual interlock protection control	PLC / Manual interlock protection control	PLC / Manual interlock protection control	PLC
Absolute air charging pressure	≤0.1Mpa	≤0.2Mpa	≤1bar（0.1Mpa）	<10 bar （1Mpa）

Features Summary:

The vacuum furnaces in the table can be separated into three different types, the vacuum sintering furnace, the vacuum heat treatment furnace and the vacuum brazing furnace.

RVS-335-D and RVS-4411-S belong to vacuum sintering furnace. The two have different functions and different process requirements, so there are corresponding differences in size, heating system and pump system, and the configuration of components.

RVS-335-D：

Due to the high design temperature, high-temperature-resistant molybdenum is used as the heating element, and the worktable is also made of high-temperature-resistant molybdenum, and the bearing capacity meets the design requirement (100kgh). Due to the need

of dewaxing function, TZM molybdenum special material muffle box is set inside the element to prevent dewaxing gas pollution. There is also a dewaxing port at the bottom of the box, and the wax-based adhesive is pumped into the dewaxing tank through a 2X-30 mechanical pump. The dewaxing tank is designed with double water cooling, relying on convoluted fins to dissipate heat, condense the adhesive and collect it.

The pump system consists of KT-400 diffusion pump, ZJP-150 Roots pump and 2X-30 mechanical pump. An isolation valve is provided to prevent contamination of the pump system. Among them, the mechanical pump is responsible for the low vacuum range, and then the Roots pump is started to operate, and finally the high vacuum in the design is pumped by the diffusion pump. The ultimate vacuum can reach 10-⁴Pa in the condition of empty furnace.

The inner wall of the furnace is made of stainless steel, and the outer wall is made of high-quality carbon steel, which can effectively withstand the pressure brought by the vacuum, as well as the internal energy and deformation generated by the internal heating, and prevent the influence of the dewaxing process. The water cooling system in the double-layer shell can effectively reduce the temperature, so that the outer surface temperature is lower than 40℃.

The vacuum furnace can be connected to the charging system according to the customer’s requirements. There are two parallel air passages for the main and auxiliary, with the electromagnetic valve used to accurately control the filling of small amount protective gas.

High temperature resistance and precise temperature control can be used not only for sintering operations, but also for annealing of metal components.

RVS-4411-S:

The non-standard customized sintering furnace is mainly used for the sintering of silicon carbide ceramics. Due to the ultra-high temperature of 2300 ℃, there is a graphite box in the heating chamber, with a graphite thermal insulation felt laid in, heating element is made of isostatic graphite. The outermost layer of graphite felt is fixed by the heat insulation board to reduce the influence of its deformation.

Thermocouples are used for the measurement in the low temperature stage, while infrared temperature measurement is used in the high temperature stage.

The graphite hearth can withstand a weight of 250kg upon request.

The vacuum system consists of two vacuum pumps, the mechanical pump is responsible for the low vacuum, and the Roots pump is then started to reach the process target. The power of the pump is higher than that of the RVS-335-D, and the ultimate vacuum is relatively lower.

The inner and outer walls of the furnace shell are made of high-quality carbon steel, with water cooling system inside, the outer wall temperature is controlled at 40 °C, and the furnace length is long in terms of specifications.

Both RVT-446 and RVGQ-669 belong to the vacuum heat treatment furnace, but the two are suitable for different processes. Among them, RVT-446 is responsible for the tempering process, and RVGQ-669 is the vacuum air quenching process.

RVT-446:

The principle of the tempering process is to reheat the quenched workpiece to improve its properties. Its structure is relatively simple, energy saving and environmental friendly. The uniformity of the internal temperature is strictly required.

The heating element is made of nickel-chromium alloy belt, and three temperature zones are set to achieve uniform heating. In order to meet the needs of heat treatment of components, it is necessary to ensure the uniformity of the temperature in the furnace, six thermocouples are used to monitor the internal temperature. The furnace body is equipped with multi-point temperature measuring joints to check the heating uniformity.

The heating chamber is equipped with a damper, which can accelerate the cooling to meet different process requirements. There is a stirring fan inside to ensure the uniformity of the internal temperature.

The vacuum unit consists of a Roots pump and a rotary vane pump. The rotary vane pump can be used in the case of large inlet pressure and still has a high pumping speed under low pressure. It is used as the backing pump in the system, while the Roots pump is Can operate in high vacuum section. The degree of vacuum is not high compared to other models.

Equipped with automatic feeding equipment, which is convenient for production.

RVGQ-669:

The gas quenching process is a kind of quenching process. The heating temperature is high, and it is necessary to rush gas into the heating chamber and circulate cooling to achieve the quenching effect. Due to the introduction of gas, the thermocouple, the gas charging and discharging interface, etc. have water cooling measures to ensure the normal sealing work at high temperature. In addition to the thermocouples used for temperature measurement and temperature control, there are nine workpiece thermocouples for workpiece temperature measurement.

The high-purity graphite heating element is used to ensure the performance at high temperature. The thermal insulation layer is composed of hard felt and soft felt, and the surface is smooth and can withstand the erosion of gas.

The load-bearing requirement is 500kg, which is relatively high.

The vacuum unit is composed of a Roots pump and a spool valve pump. The spool valve pump has a wide working range with reliable structure. The Roots pump is suitable for high vacuum and can achieve a high degree of vacuum.

The cooling system consists of a motor, an impeller, a heat exchanger and a reasonably arranged air duct, to provide a quick and uniform cooling of the workpiece. The copper heat exchanger with high fins has a larger heat exchange area and increases the cooling efficiency.

Equipped with a feeding car can feed automatically

RVB-121220L-AL is an aluminum heat exchanger brazing furnace for brazing work. Due to the large size of the workpiece, there are corresponding requirements for the size of the furnace. In order to accurately melt the solder without damaging the workpiece, there is a high demand for temperature and vacuum in addition. The heating chamber is square, insulated and can be disassembled as a whole. In order to ensure the uniformity of heating and the accuracy of temperature, 11 independent heating zones are set up to ensure the temperature requirements within a large heating range.

The furnace is equipped with multi-point temperature measuring joints, which can check the uniformity of the temperature in the furnace.

Due to the large heating space in the furnace, the vacuum system consists of four pumps, including a diffusion pump, a roots pump, a mechanical pump, and a maintenance pump. The purpose of using the pump set is to generate a very high vacuum in a large furnace volume.