43results about How to "Near net shape" patented technology

The process of forming artificial joint of nanometer bioceramic relates to nanometer ceramic material forming technology, and aims at solving the problem of forming complicated shape ceramic product. The process includes the following steps: 1. hot pressing and sintering composite Al2O3 / ZrO2 powder or ZrO2 / HAP powder to prepare nanometer ceramic block; and 2. closed die forging to form ceramic product at high temperature. By means of the twice forming process, the present invention can form ceramic part of complicated shape. The present invention has the advantages of simple forming process, easy manufacture of mold, low cost, etc.

The invention provides a degradable antibacterial magnesium alloy and a preparation method of the degradable antibacterial magnesium alloy, and relates to the field of metal biomedical materials. Thedegradable antibacterial magnesium alloy comprises main active elements of Ag, Cu, Zn and Sr, and by means of composition optimization design of the magnesium alloy, the components comprise, by mass,1.35-1.65% of Ag, 0.9-1.1% of Cu, 3.6-4.4% of Zn, 0.9-1.1% of Sr, 0.36-0.44% of Ca and the balance Mg and other inevitable impurities. After the magnesium alloy material implant finishes the action, the magnesium alloy material implant can be completely degraded to avoid secondary operation removal, the medical cost and the pain of patients are reduced, the antibacterial property of the implant isimproved, and the magnesium alloy material implant has the functions of promoting osteoblast formation and inhibiting osteoclast bone absorption; the degradable antibacterial magnesium alloy adopts asemi-solid rheological die casting process, the microstructure of the product is uniformly distributed, the internal structure is compact, the defects of pores, segregation and the like are few, andthe requirements for high quality and high precision of implant products can be met.

The invention relates to a liquid die forging rolling composite forming method for an H13 hot work die steel unusual section large forging. The liquid die forging rolling composite forming method comprises the following steps of: (1) smelting; (2) liquid die forging, namely fixing a liquid die forging die on an indirect extrusion casting machine, pouring hot work liquid die forging die solution to the liquid die forging die and keeping the pressure for 35-90s under the pressure to obtain a near-net-section ring blank, wherein the pouring temperature is 1530-1630 DEG C; the pressurizing speed is 30-40mm / s; the filling time is 1-6s; the specific pressure is 150-200MPa; (3) homogenizing; (4) waste heat isothermally rolling, namely reducing the temperature of the homogenized near-net-section ring blank to be 1065-1175 DEG C and carrying out waste heat isothermally rolling on a diameter shaft composite rolling ring machine; (5) heat treating; and (6) finishing. With the adoption of the liquid die forging rolling composite forming method for the H13 hot work die steel unusual section large forging, the blanking preparing process of the hot work liquid die forging die ring forging can be simplified, the cost can be reduced, the production efficiency can be improved, the microstructure state of a nickel base high-temperature hot work liquid die forging die ring forging can be effectively improved, and the comprehensive mechanical performance can be effectively improved.

The invention discloses an iron-based gradient structure gear and a manufacturing method thereof; to realized high surface layer hardness and high core / shell layer bonding strength, Fe2Ni is adopted as a core layer and the Fe2Ni added with an alloying element Cr is adopted as a shell layer; through strengthening effect of Cr, sintering / heat treatment is adopted to facilitate surface layer hardness to exceed 40 HRC and realize the metallurgical bonding of the core layer and the shell layer; sintering time is adjusted to realized homogeneous diffusion of Cr outside the interface and core / shell layer bonding strength is higher than 280 MPa.

The invention discloses a hot push bending forming method of a wind tunnel scimitar. The forming method includes a. selecting a long steel plate with a rectangular cross-section and a width-to-thickness ratio of 7 to 10; b. installing a cooling water ring and an induction coil matching the cross-sectional size of the steel plate on the pushing machine; c. passing the steel plate through One end of the supercooled water ring and the induction coil is fixed on the push table of the hydraulic propulsion system of the pushing machine, and the other end is fixed on the straight plate clamp of the pushing machine, and the straight plate clamp is connected to the angle radius adjustment rod; d. Induction coil heating Part of the steel plate, when the local temperature of the steel plate reaches the bendable temperature, the hydraulic propulsion system of the pushing machine slowly pushes the steel plate forward, the straight plate clamp rotates around the angle radius adjustment rod, the steel plate is continuously bent at the position of the induction coil, and a flat semicircle is obtained after forming Ring machete. The scimitar forming method of the forming method has the advantages of stable forming, high speed, high precision, good mechanical properties, small blank tonnage required, obvious technical and economic advantages, and has the value of popularization and application.

The invention discloses a liquid die forging and rolling composite forming method for large stainless steel rings with different cross-sections, which includes melting → liquid die forging → homogenization → waste heat isothermal rolling → heat treatment → finishing; After the die forging die is fixed on the indirect squeeze casting machine, the stainless steel solution obtained by melting is poured quantitatively into the liquid die forging die. 6s, the specific pressure is 150-200MPa, and the pressure is maintained at this pressure for 35-90s to obtain a ring blank with a near-end section; the isothermal rolling with waste heat is: the homogenized ring blank with a near-end section is cooled to 1120-1160°C , the waste heat isothermal rolling is carried out on the diameter-shaft composite ring rolling mill. The liquid die forging and rolling composite forming method for stainless steel rings with different cross-sections of the present invention can not only simplify the blank-making process of alloy rings, reduce costs and improve production efficiency, but also can effectively improve the microstructure of stainless steel rings, improve Comprehensive mechanical properties.

The invention provides a liquid forging and rolling composite molding method of a nickel-base superalloy hetero-cross-section large ring piece. The liquid forging and rolling composite molding method comprises the following steps of: smelting, liquid forging, homogenization, waste heat isothermal rolling, heat processing and finishing. The step of liquid forging comprises: fixing a liquid forging mold on an indirect extrusion casting machine, subsequently casting a certain quantity of obtained nickel-base superalloy solution to the liquid forging mold, wherein the casting temperature is 1350-1450 DEG C, the pressuring speed is 35-50mm / s, the mold filling time is 1-6s, the specific pressure is 300-400MPa; and keeping the pressure for 35-90 seconds under the pressure so as to obtain a final cross section nearest ring blank. The step of waste heat isothermal rolling comprises: carrying out waste heat isothermal rolling on a radial axis composite ring rolling machine after the final cross section nearest ring blank subjected to homogenization is cooled to 1020-1140 DEG C. By utilizing the liquid forging and rolling composite molding method of the nickel-base superalloy hetero-cross-section large ring piece, not only can the blank manufacturing process of the alloy ring piece be simplified, the cost is reduced and the production efficiency is improved, but also the micro-texture state of the nickel-base superalloy ring piece is improved, and the comprehensive mechanical property is improved.

The invention discloses a liquid die forging rolling compound forming method for a 2A70 aluminium alloy large ring member with different cross sections. The liquid die forging rolling compound forming method comprises the following steps of: 1), smelting; 2), liquid die forging: fixing a forged die on an indirect extrusion casting machine; pouring alloy solution in the forged die for mold-filling for 1-5s at the pouring temperature between 700 and 720 DEG C and specific pressure between 180 and 200 MPa in the pressurizing speed of 35-40mm / s; and keeping the pressure for 40-60s under the pressure to obtain a ring blank with a nearly end cross section; 3) homogenization: cooling the ring blank with the nearly end cross section to 495 DEG C for keep the temperature for 16h; 4) afterheat isothermy rolling: reducing the temperature of the homogenized ring blank with the nearly end cross section to 430-450 DEG C, and performing isothermy rolling on a radial-shaft compound ring rolling machine; 5) thermal treatment: raising the temperature of the ring blank to 535 DEG C, keeping the temperature for 3 hours and performing water quenching; and then, raising the temperature to 190 DEG C and keeping the temperature for 12h; and 6) finishing.

The invention discloses a liquid die-forging and rolling composite forming method for a 6082 aluminum alloy special-section large ring piece. The method comprises the following steps of: 1) smelting; 2) performing liquid die-forging, namely fixing a die-forging die on an indirect extrusion casting machine, and pouring an alloy solution into the die-forging die at the pouring temperature of between 650 and 680 DEG C under the pressurization speed of between 35 and 40 mm / s, wherein the filling time is 1 to 6 seconds, and the specific pressure is 100 to 150 MPa; and keeping the pressure of between 100 and 150 MPa for 35 to 60 seconds, and thus obtaining a similar final section ring blank; 3) homogenizing, cooling the similar final section ring blank to the temperature of 550 DEG C, and keeping the temperature for 6 hours; 4) performing afterheat isothermal rolling, namely cooling the homogenized similar final section ring blank to the temperature of between 450 and 480 DEG C, and performing isothermal rolling on a radial shaft composite ring rolling machine; 5) performing thermal treatment, namely keeping the temperature of the ring blank at 525 DEG C for 1 hour, quenching in the water, rising the temperature to 165 DEG, and keeping the temperature for 12 hours; and 6) performing fine adjustment.