3results about How to "Stable temperature gradient" patented technology

This utility model relates to a solidification mold for aero-engine blades, comprising a blade shell membrane, a base plate, a pouring head, a sprue, a runner, and a heat insulation plate. The heat insulation plate includes an inner heat insulation plate and an outer heat insulation plate. The outer edge of the inner heat insulation plate has multiple evenly distributed notches (I). The outer heat insulation plate has a fan-shaped structure with notches (II) on its inner side. Notches (I) and (II) form a channel with the same cross-section as the blade shell membrane. The outer heat insulation plate is detachably installed on the outside of the inner heat insulation plate. This utility model, through the combined design of the inner and outer heat insulation plates and the ingenious cooperation of notches (I) and (II), forms a channel that perfectly fits the cross-section of the blade shell membrane. This design significantly reduces the gap between the blade shell membrane and the heat insulation plate, improves the heat insulation effect, effectively prevents heat exchange at the gap, and achieves a higher and more stable temperature gradient. The detachable connection between the inner and outer heat insulation plates provides convenience for the placement and removal of the blade shell membrane.

The application discloses a preparation method of an impact-resistant non-uniform hard alloy, and the method takes tungsten carbide powder with a particle size of 0.6-0.8 microns and tungsten carbide powder with a particle size of 2-2.5 microns as main raw materials, and is additionally provided with cobalt powder as a binder phase, and is further combined with grain inhibitors such as tantalum carbide, chromium carbide and yttrium oxide to inhibit abnormal growth of fine crystal regions in a sintering process, so as to ensure the stability and high hardness of the fine crystal structure of the bearing substrate, and to form a Zener pinning effect to mechanically hinder the migration of the grain boundary, further refine and stabilize the structure, purify the interface and strengthen the phase combination, and solve the problems of the existing hard alloy, such as difficult consideration of strength and toughness, easy fragmentation under high-speed impact load, sharp performance degradation caused by interface weakening in a high-temperature environment and the like.

The application discloses a cooling device and method for forming stable temperature gradient by large cylinder segment differential temperature rolling, and relates to the technical field of rolling metallurgy process. The flow of cooling water can be automatically adjusted according to the temperature distribution in the thickness direction of the cylinder segment and the flow fluctuation in the pipeline, thereby reducing the axial temperature difference of the cylinder segment and the risk of surface cracking, and the cooling water can be recycled without filtration. The cooling device comprises a temperature acquisition device, a control unit, an upper cooling support device and a lower cooling support device; the upper cooling support device and the lower cooling support device are respectively supported on the inner and outer wall surfaces of the cylinder segment; the upper cooling support device comprises an upper cooling roller and a cooling system symmetrically arranged on both sides of the upper cooling roller; the upper cooling roller comprises a shell, a reflux cylinder and a center support plate; the lower cooling support device is the same in structure as the upper cooling device; the cooling system comprises a water inlet pipeline, a water return pipeline, a water pump, a water tank and a plurality of spraying assemblies. The application also provides a cooling method based on the device.