42results about How to "Improve plastic forming ability" patented technology

The invention discloses a high-silicon aluminum alloy swash plate die-forging process, which realizes plastic forming of die forgings by a small flashing open type forging die. The die-forging process comprises the following steps: extruding a bar material, blanking, heating, die-forging plastic forming and post treatment, wherein the heating temperature of a blank is 500+/-5 DEG C, and the preheating temperature of a concave die is 200+/-5 DEG C; the small flashing die-forging process directly forges the heated aluminum alloy bar material to form swash plate die forgings with small flashing; the die is the small flashing open type forging die and consists of an upper convex die, a lower convex die and an extrusion cylinder; the concave die adopts a detachable structure; during ejecting, the die forgings are directly ejected from the lower convex die; the upper convex die is provided with annular even gaps of which height is 3 millimeters and thickness is 0.5 millimeter, namely flashing grooves; and the gradient of all surface withdrawing die contacted with the extrusion cylinder is less than or equal to 5 degrees. The process flow is reasonable, the process parameter and performance are stable, the die has a simple structure, the manufacture, assembly and use are convenient, and the work is reliable.

The invention belongs to the technical field of new materials, in particular to a preparation process for modifying and optimizing magnesium alloy matrix and reinforcing the interphase contact surface and interface aiming at the magnesium borate crystal whisker reinforced magnesium-matrix composite material. The study proves that no obvious interface reaction occurs at the interface of the magnesium borate crystal whisker and the magnesium matrix, and the bonding strength of the interface is not high. By adopting the invention, the interface of the crystal whisker reinforced magnesium-matrix composite material reaches a better bonding state, and the performance of the magnesium borate crystal whisker reinforced magnesium-matrix composite material is improved. The preparation process comprises steps of coating the magnesium borate crystal whisker, preparing the modified magnesium borate crystal whisker prefabricated block, preparing cast composite ingot blank by a vacuum pressure infiltration method; and thermally extruding the ingot blank. The composite material comprises components of aluminium isopropoxide Al(OC3H7)3, distilled water, muriatic acid, magnesium borate crystal whisker, magnesium and the balance of magnesium alloy.

The invention discloses a low-cost high-speed-extruded magnesium alloy material and a preparation process thereof and belongs to the technical field of metal materials. The extruded material comprises the following chemical components by weight percent: 0.1-0.9% of Zn, 0.1-0.5% of Ca, 0-0.5% of Mn and the balance Mg and inevitable impurities, wherein the total content of the alloy elements (Zn, Ca and Mn) does not exceed 1.5 wt%. Production is performed at the extrusion outlet speed of more than or equal to 24 m/min, the extrusion production efficiency is high, the cost of the extruded material is lowered, the extruded material is smooth in surface and has no surface cracks, and therefore, the yield of the extruded material is guaranteed; and meanwhile, the extruded material has a weak non-basal texture with the maximum density value of less than or equal to 4. The extruded material is low in content of alloy elements, does not contain rare earth elements or other noble metal elements, and therefore, is low in cost.

The invention provides room-temperature high-plasticity wrought magnesium alloy and a preparation method thereof. The magnesium alloy comprises the following components by weight percent: 5.5wt%-7.3wt% of Al, 0.40wt%-1.50wt% of Zn, 0.15wt%-0.50wt% of Mn, 0.05wt%-1.0wt% of P and the balance being Mg and inevitable impurities, wherein the inevitable impurities comprise the following components: not more than 0.05wt% of Si, not more than 0.004wt% of Fe, not more than 0.004wt% of Cu and not more than 0.002wt% of Ni. According to the magnesium alloy, a nonmetal element P is added in an existing magnesium alloy smelting process, a stable small grain structure is obtained under the action of the nonmetal element P, the room-temperature plasticity is improved, and the room-temperature processing and using requirements of finished products or semi-finished products can be met.

The invention discloses a high-speed extruded magnesium alloy deformed profile low in rare earth content and a preparation technique thereof, and belongs to the technical field of metal materials. The magnesium alloy comprises, by weight, 0.1-2.0% of Zn, 0.1-0.9% of RE, and the balance Mg. A trace of or a small amount of rare earth (RE) is added into the magnesium alloy, and the alloy cost is effectively reduced. Production is conducted with the speed of an extrusion outlet larger than 24 m/min, the extrusion production efficiency is high, the cost of the extruded profile is reduced, the surface of the obtained extruded profile is smooth and free of cracks, and the yield of the extruded profile is guaranteed. Meanwhile, the obtained extruded profile might have weak basal textures or weak non-basal textures, and the maximum pole density value of the weak basal textures or the weak non-basal textures is smaller than or equal to 4; and through optimized constituents, the room-temperature elongation of the extruded profile can be larger than or equal to 25%.

The invention discloses a die-forging process for high-silicon aluminum alloy pistons and forging die. The process can directly mold a high-silicon aluminum alloy extrusion bar blank in one step into a piston forging piece heated up to 400-470 DEG C which has a transversal flash edge of a thickness no more than 1.2 mm along the die parting surface, and the piston forging is obtained after cutting the flash edge. The forging die comprises an upper die and a lower die. The die cavity of the lower die is provided circumferentially with a flash edge groove that consists of a bridge portion and a storage portion. The width/thickness ratio of the bridge portion close to the die cavity is 8-10. The upper and the lower dies are guided and positioned based on the engagement of two pilot pins and the corresponding pilot holes. The forging die is mounted to work on a high-speed hydraulic press (4000KN). The inventive process has the advantages of good stability, simple die structure and easy operation.

The invention discloses a Y-doped Mg alloy. The Y-doped Mg alloy is composed of Mg, Zn, Zr and Y and comprises, by mass, 4.9-5.5% of Zn, 0.16-0.19% of Zr, 2.9-3.2% of Y, and the balance Mg and inevitable impurities. A preparation method of the Y-doped Mg alloy comprises the steps of (1) preparation of alloy powder, specifically, adding ethyl alcohol to Mg-Zn-Zr powder and Y powder, adding zinc stearate, conducting vacuum pumping, and conducting ball milling to obtain the alloy powder; (2) sintering, specifically, feeding the alloy powder into a vacuum hot pressing sintering furnace, and conducting vacuum pumping, heating sintering and cooling to obtain an alloy billet; and (3) hot extrusion, specifically, conducting heat preservation, feeding the alloy billet into an extrusion die for extrusion and then obtaining the Y-doped Mg alloy. According to the Y-doped Mg alloy and the preparation method thereof, the rare earth element Y is subjected to solid solution to go into a Mg base body to promote formation of an alloy double-peak crystal structure, grain refinement, generation of high-melting-point hard phases and the like. On the premise of ensuring the strength, the toughness and plastic formability of the Mg alloy are improved, and a certain reference basis is provided for actual application of the Y-doped Mg alloy.

The invention provides a spiral rivet lock welding device for explosive shock forming. The spiral rivet lock welding device comprises an implementation mechanism, rivet units, a guide edge pressing mechanism and a controller. The rivet units are stored in a rivet box in a centralized manner. The implementation mechanism can move and is used for taking the rivet units from the rivet box, placing the rivet units on the guide edge pressing mechanism and triggering the rivet units. The guide edge pressing mechanism is pressed on an upper plate and a lower plate in advance and used for pressing theupper plate and the lower plate on a flat die. The controller is electrically connected with the implementation mechanism and the guide edge pressing mechanism respectively and used for controlling movement of the implementation mechanism and pressing of the guide edge pressing mechanism. The invention further provides a spiral rivet lock welding method for explosive shock forming. The spiral rivet lock welding device is reasonable in structural design and high in operation automation degree, plate connection can be efficiently completed, the connecting point precision is high, the mechanicalperformance is high, and the characteristic of resisting torque is achieved.

The invention provides a semi-solid magnesium alloy gradient extrusion combination die. The left side of a supporting plate of the die is fixedly connected with a casting-rolling machine rack througha bolt, the right side of the supporting plate of the die is connected with a temperature control room through a bolt, and the interior of the die is connected with a diversion room, a male die and afemale die in an interference fit manner. The supporting plate is connected with the diversion room through a bolt, the right side of the diversion room is connected with the male die and the female die in a clearance fit manner, and the right end of the temperature control room is connected with a support through a bolt. The support is connected with the female die through a bolt, the left end ofa core bar is fixed to the male die, and the axis of the core bar coincides with the axis of the female die. In other words, a core is in interference fit with a core hole, a solution enters a diversion hole through a diversion bridge in a diversion manner, then enters a welding room and finally flows out of the core hole, backward spiral type cooling liquid is distributed on the periphery of themale die and the periphery of the female die, and therefore the solution solid phase rate is controlled. By means of the semi-solid magnesium alloy gradient extrusion combination die, the texture distribution is effectively improved, the anisotropy is weakened, the plastic forming capability of products is improved, and energy is saved; and the beneficial effects that the production capacity is high, the quality is high, flexibility is high, and production is stable are achieved.

The invention relates to the field of layered composite materials, in particular to a magnesium-aluminum layered composite plate and a preparation method thereof. The preparation method of the magnesium-aluminum layered composite plate comprises the following steps: preparing a composite pipe blank by adopting centrifugal casting; the composite pipe blank is pretreated to form a composite board; two or more composite boards with the same size are stacked and rolled according to the mode that aluminum layers and magnesium layers are alternately arranged at intervals, the magnesium-aluminum layered composite board is obtained, and a nickel layer is arranged between every two adjacent composite boards. And centrifugal casting is adopted, so that the grain size of the composite plate is refined, the strength and the plastic forming capacity are improved, and subsequent rolling deformation is facilitated. And a nickel layer is arranged between the composite plates before ply rolling, so that a large number of hard and brittle intermetallic compounds are prevented from being generated at the interface of the composite plates at the medium-high temperature (350-500 DEG C), and the mechanical property of the magnesium-aluminum composite plate is improved.

The preparation method comprises the following steps: synthesizing an Al-TiB2 intermediate alloy containing nanoscale TiB2 ceramic particles through an in-situ reaction, adding the Al-TiB2 intermediate alloy into a magnesium alloy melt to obtain a TiB2/Mg composite material, carrying out hot rolling to obtain a thin plate, alternately stacking the thin plate and a pure magnesium plate, and carrying out vacuum hot pressing sintering to obtain the layered magnesium-magnesium-based composite material plate. And the layered magnesium/magnesium-based composite material plate with excellent performance can be prepared through multi-pass hot rolling. In the macroscale, the ceramic particles are non-uniformly distributed in a layered manner, and in the microscale, the ceramic particles are uniformly distributed in the magnesium-based composite material layer. The strength, plasticity and toughness of the laminated composite material plate can be flexibly and accurately regulated and controlled by regulating and controlling the content of TiB2 particles in the laminated composite material and the interlayer spacing, the problem that the toughness of the composite material is mismatched is hopefully solved, and the method has a wide application prospect.