[China Aluminum Industry Network] Continuous aluminum alloy quenching furnace is suitable for solution treatment and timely treatment of large and medium-sized aluminum alloy product parts. This equipment is specially designed for aluminum castings, large quantities of solid-melting and aging heat treatment. This equipment is used in conjunction with electrical controls and has a high degree of automation.
The continuous aluminum alloy quenching furnace is composed of a heating furnace cover and a movable chassis. The square (or round) furnace hood is equipped with a crane, and the basket can be hoisted to the furnace through chains and hooks. The furnace hood is supported by a profiled steel and the bottom of the oven door is operated pneumatically (or electrically). The base frame below the furnace hood can be moved along the track and positioned. The chassis carries the quenched water tank and basket. During production, the basket on the base frame is moved to the bottom of the furnace cover, the furnace door is opened, the chain and the hook are lowered, the material basket is lifted into the furnace, and the furnace door is closed and heated. The quenching is the ground. First move the sink on the bottom frame directly under the hood, then open the door and put down the chain to quench the basket (workpiece) into the water.
Continuous aluminum alloy quenching furnace main technical features:
The electric furnace is mainly composed of the main parts of the furnace body (including the furnace door), the furnace lining, the door lift, the furnace truck, the drive mechanism of the furnace car, the electric heating device, the temperature control and the recording system.
Concrete can be customized according to user requirements continuous aluminum alloy quenching furnace working principle:
The cooling rate in quenching is an important factor that can affect the quenching quality and determine the residual stress. It is also a factor that can give important or even decisive influence on the quenching crack. In order to achieve the purpose of quenching, it is usually necessary to accelerate the cooling rate of the part in the high temperature section and make it exceed the critical quenching cooling rate of the steel to obtain the martensite structure. As for the residual stress, since this can increase the thermal stress value that counteracts the stress of the tissue, it can reduce the tensile stress on the surface of the workpiece and achieve the purpose of suppressing the longitudinal crack. The effect will increase as the high-temperature cooling rate increases. Moreover, in the case of hardenability, the larger the cross-sectional size of the workpiece, although the actual cooling rate is slower, the greater the risk of cracking. All this is due to the fact that the thermal stress of such steel increases with the size, the actual cooling rate slows down, the thermal stress decreases, and the tissue stress increases with the increase of the size. Later on, the tensile stress mainly based on the microstructure stress acts on The effect of the workpiece surface features. And contrary to the traditional concept of cooling the slower the stress is very different. For such steel parts, only longitudinal cracks can form in the hardenable hardened steel parts that are quenched under normal conditions. The reliable principle of avoiding quenching cracks is to try to minimize the unequal time to transform the martensite inside and outside the section. The use of slow cooling in the zone of martensitic transformation is not sufficient to prevent the formation of longitudinal cracks. In general, cracks can only be produced in non-hardenable parts. Although rapid cooling as a whole is a necessary forming condition, its actual formation is not in the rapid cooling (including the martensitic transformation zone) itself. It is the localized position of the quenched part (determined by the geometry), and the cooling rate in the high temperature critical temperature zone is significantly slowed down, and therefore is not hardened. The transverse and longitudinal spalls produced in large non-hardened parts are caused by the residual tensile stress, which is mainly composed of thermal stress, acting on the center of the quenched part. At the center of the hardened part at the end of the quenched part, cracks are formed first and Caused by inward expansion. In order to avoid such cracks, a water-oil two-liquid quenching process is often used. In this process, rapid cooling in the high temperature section is carried out in order to ensure that the outer layer metal obtains the martensite structure. From the viewpoint of internal stress, the rapid cooling is not beneficial at this time. Secondly, the purpose of slow cooling in the late stage of cooling is not to reduce the expansion rate and the tissue stress value of the martensitic transformation, but to reduce the temperature difference between the section and the center of the section, so as to reduce the stress and reduce the stress. Final quench quenching purpose.
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