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Roll sleeve of ultra-strong wear-resistant high alloy steel roll squeezer and manufacturing method roll sleeve

The invention relates to a roll sleeve of an ultra-strong wear-resistant high alloy steel roll squeezer and a manufacturing method of the roll sleeve, belonging to the technical field of casting in building material industry. The technical scheme is as follows: an outer layer adopts ultra-strong wear-resistant high alloy steel, an inner layer is formed by compounding low-carbon medium alloy steel, and the roll sleeve is manufactured through the process steps of melting the outer-layer ultra-strong wear-resistant high alloy steel, melting the inner-layer low-carbon medium alloy steel, centrifugally casting the compound roll sleeve and performing heat treatment on the compound roll sleeve. The roll sleeve and the manufacturing method thereof, disclosed by the invention, have the positive effects that: the preferential mixture ratio of the inner-layer material to the outer-layer material of the roll sleeve is adopted and a reasonable centrifugal compound casting process is adopted, thereby the inner layer and the outer layer are subjected to metallurgical bonding and a good bonding state is achieved. According to the characteristics of high alloy of the roll sleeve, the fracture toughness of the roll sleeve is enhanced by raising tempering temperature and performing multiple tempering processes. The outer layer of the roll sleeve disclosed by the invention has the hardness of 60-64HRC and the impact toughness of 12J / cm<2>, the inner layer has the hardness of 26-30HRC, the tensile strength of 800-900MPa and the yield strength of 730MPa, and the service life of the roll sleeve is prolonged by above 2 times in comparison with the traditional roll sleeve formed by forging and overlaying welding.
Owner:河北津西钢铁集团重工科技有限公司

Method for manufacturing injection-molding rare-earth radial magnetic ring

A method for manufacturing injection-molding rare-earth radial magnetic ring belongs to the technical field of rare earth magnet preparing. The method of the invention comprises the following technical processes: mixing and drying the rare-earth magnetic powder which is coated by the coupling agent and antioxidant in negative pressure until the dissolvent and the absorbed gas is totally released, then placing the thermoplastic organic resin powder into a mixing machine for mixing to uniform in inert protective atmosphere, then placing a double-screw extruder with protective atmosphere, fully compounding the thermoplastic organic binding agent with magnetic powder, granulating for obtaining the granulate for rare-earth anisotropic bonded permanent magnet, placing the granulate into a magnetic field injector with magnetic field mold for preparing into the magnetic ring oriented along the radial direction, wherein the magnetic ring comprises radially oriented magnetic ring and multipole magnetic ring. The method of the invention has the advantage that the granulate manufactured by organic resin has excellent oxidation resistance, fluidity and magnetic characteristic. The radiating, quadrupole and multipole oriented magnetic field which is obtained by matching the permanent magnet repulsive permutation and combination and magnetic material is higher than the permanent magnetic field in which N and S are alternately permutated and combined. An energy saving effect is obtained.
Owner:BEIJING BEILILONG MAGNETIC MATERIALS TECH
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