Structural Characteristics of Vacuum Quenching Furnace

The vacuum quenching furnace is suitable for solution treatment and timely treatment of parts and components of large and medium-sized vacuum products. The vacuum high-pressure gas quenching furnace is a very advanced vacuum heat treatment equipment. Its excellent performance and unique design provide a wide range of vacuum bright gas for high-precision parts of high-speed steel, die steel, stainless steel, alloy steel, titanium alloy, etc. Features of quenching, annealing, sintering of magnetic materials and rapid cooling. The vacuum quenching furnace is composed of a heating furnace cover and a movable bottom frame. The top of the square (or round) furnace hood is equipped with a crane, and the material basket can be hoisted to the furnace through chains and hooks. The furnace hood is supported by profiled steel, and there is a pneumatic (or electric) operated furnace door at the bottom. The bottom frame under the furnace hood can be moved and positioned along the track, and the bott om frame is equipped with a quenching water tank and a material basket. During production, move the material basket on the bottom frame to just below the furnace hood, open the furnace door, lower the chain and hook to hoist the material basket into the furnace , and close the furnace door for heating. Quenching is ground, first move the water tank on the bottom frame to just below the furnace hood, then open the furnace door, put down the chain, and quench the basket (workpiece) into the water .

The vacuum quenching furnace is composed of a furnace body, a furnace body steel support, a detachable furnace top, a furnace lining, an electric heating element, a circulating fan, an air guide plate, a furnace bottom split furnace door, a double- speed lifting mechanism, a material rack, a quenching tank, and a transportation It is composed of material truck, control system, power distribution cabinet/control cabinet, hydraulic system, etc. The furnace shell frame is welded with profiled steel, the inner wall is made of 1Cr18Ni9Ti heat-resistant steel plate, and the inner lining is made of high-quality full-fiber structure. A layer of rubber asbestos board is attached to the inner surface of the furnace shell to provide heat insulation and protect the surface of the furnace shell from corrosion. The heating element adopts the heating element to be wound into a ribbon shape with 0Cr25AL5 alloy wire, sheathed on an insulating porcelain tube, and fixed on the furnace shell through stain less steel round steel. This structure resistance band is hung around the furnace, which facilitates heat dissipation and circulation. The hot air circulation device is composed of a fan device and an air guide plate. The fan device is placed on the top of the furnace body. The fan is made of 1Cr18Ni9Ti heat-resistant steel into a centrifugal fan blade. The wind deflector is made of 1Cr18Ni9Ti heat-resistant steel, and is fixed on the inner wall of the furnace through a number of shelf rods, wrapping the resistance band inside, and thermally circulating the heat dissipated by the resistance band through the hot air circulation system to make the temperature in the furnace uniform. The ventilation device is made according to the furnace volume to ensure that the number of hot air cycles is more than 40 times per minute.

The base frame is used for storing furnace parts and is welded by section steel. The furnace door shell is formed by welding steel, and the inner lining is made of high-quality all-fiber structure. The furnace door and the furnace body are sealed with aluminum silicate refractory fiber material.

The electric stove is equipped with two carts. The lifting mechanism is composed of a hoist, a loading frame, a lifting hinge, a rolling wheel, etc. The winch is installed on the side of the base frame, adopts a low-speed ratio reducer, and has a self-locking device, which can ensure that the loading frame stays at any position and decelerates to run, and prevents the loading frame from quickly hitting the quenching tank when it is lowered. The loading frame is made of section steel according to user requirements. The lifting device frame is hauled by steel cables.

The depth of the quenching pool is 1.5 times higher than that of the loading frame, which can ensure that the workpiece is quenched and cooled in the quenching pool, and an electric heating tube is used for heating in the quenching pool. And it is automatically controlled by a temperature measuring instrument. The pool has a water inlet to cool the water temperature, and a circulating water pump is installed in the pool to circulate hot water to make the temperature even. Refractory fiber cotton sand sealing knives are embedded around the furnace mouth. After the furnace door is closed, it is closely attached to the insert knife at the furnace mouth to ensure that no heat is dissipated. The heating element adopts belt-shaped electric heating elements, which are respectively arranged on both sides of the furnace , and the material is 0Cr25AL5 alloy wire, which has a long service life.

Each mechanical transmission part of the electric furnace adopts interlocking control, that is, after the furnace door is opened, the fan device and the heating element power supply are automatically cut off. After the furnace door is closed in place, the ventilator device and the heating element can be switched on to prevent malfunctions and accidents caused by misoperation. The system has a sound and light alarm function. The temperature control system uses PID zero-crossing to trigger the thyristor, and the intelligent meter controls the temperature.