57results about How to "Improve the densification effect" patented technology

The invention discloses a pressing head and device for achieving densification of a spray deposition porous panel and application of the pressing head and the device. An installation end face and a working end are arranged on the pressing head, and a first pressure keeping area, a main pressing area, a prepressing area and a second pressure keeping area are arranged at the working end in the advancing direction of the pressing head. The main pressing area is a horizontal plane, the prepressing area is a slope and inclines from the main pressing area to the installation end face, and the two pressure keeping areas are used for preventing materials from flowing when densification is achieved. The four areas where smooth transition exists are arranged on the pressing head, continuous deformation of the materials is achieved in the densification process, and no fracture can be produced. Meanwhile, the invention discloses the device which is used for achieving densification and provided with the pressing head. When the panel is machined through the device, the pressing face of the main pressing area horizontally acts on a panel blank, and the pass reduction of the pressing head is larger than the inclination height of the prepressing area of the pressing head relative to the main pressing area of the pressing head. Uniformity of the microscopic structure of the panel blank can be kept in the densification process.

The present invention provides a preparation method of high-strength proppant. Said method includes the following steps: mixing bauxite raw ore powder, rare earth concentrate, combustible substance and binding agent according to a certain mixing ratio, grinding them into powder material, sphere-forming to obtain blank spheres, screen to obtain semi-finished product spheres, roasting at 1250-1500 deg.C, further screening, polishing, removing dust, finally covering the spheres with phenol-formaldehyde resin so as to obtain finished product. Said invention also provides its application range.

The invention relates to a method for preparing a copper-based powder metallurgy part with a densified surface. In order to make the prepared copper-based powder metallurgy part have better density and strength, the invention designs an extrusion process for extruding the outer surface of the part. The die and the extrusion mandrel on the inner surface of the extruded part are supplemented by an upper punching die and a lower punching die that can clamp the part. When in use, the part is fixed and the corresponding extrusion die is moved to complete the extrusion. Such a method can avoid the defect that cracks are prone to appear in the part after the extrusion is completed; compared with the energy required for the surface plastic densification after the sintering step in the prior art, the present invention can use less extrusion The margin gets a larger deformation depth, and significantly reduces the energy demand, thereby reducing the production cost and improving the degree of densification; the shape of the prepared blank part is closer to the shape of the final product, so the extrusion margin is small, and the impact on the mold The loss is small, which prolongs the life of the mold to a certain extent.