60results about How to "Reduce the number of annealing" patented technology

The invention relates to a magnesium alloy plastic processing technology, and relates to a forging method for multi-direction, circulatory and high-speed hammer forging of a magnesium alloy. The method comprises the specific steps: after carrying out homogenization annealing of a casting-state or deformation-state magnesium alloy, carrying out continuous high-speed hammer forging along one direction of the bulk material at a certain temperature; after a certain deformation amount is reached, overturning the material, and continuing to carry out continuous high-speed hammer forging along another direction to reach a certain deformation amount; then overturning the material to another direction, and carrying out such circulatory hammer forging until the material reaches a predetermined deformation amount and size; and finally, carrying out heat treatment on the material. The method utilizes the textured micostructure formed during the processes of high-speed hammer forging of the magnesium alloy to be combined to change the hammer forging direction, thereby improving the ultimate deformation amount that the magnesium alloy can withstand and is not cracked during forging, and improving the plastic processing performance of the magnesium alloy. The method is suitable for magnesium and the alloy material thereof, and improves the forging processing production efficiency of magnesium and the alloy material thereof.

The invention discloses a method for forming thin-walled parts through stamping and drawing, which is used for reducing the thicknesses (0.4-2mm) of raw materials to 50-100% of the original thicknesses the raw materials; the raw materials comprise magnesium alloys, aluminum alloys, titanium alloys, high temperature alloys and complex splice-welded plates; and the method specifically comprises the following steps that: a flexible forming technique is adopted with the aid of moulds and a hydraulic machine, wherein the moulds are in concave-convex fit with the hydraulic machine; upper and lower blank holders and concave and convex moulds are respectively subjected to hydraulic pressure exertion control; the nominal pressure of a main hydraulic cylinder exerted on the concave and convex moulds is 25000-4500 KN, and the nominal pressure of a side-pressing hydraulic cylinder accounts for 50-67% of the nominal pressure of the main hydraulic cylinder; and the maximum operating pressure of a liquid chamber is 150MPa. By using the method disclosed by the invention, an expected effect is obtained, and the qualification rates and efficiencies of parts are obviously improved; and meanwhile, the hydroforming technology fills in the gaps in industry application, and lays a solid foundation for the thorough solving of technical bottlenecks existing in actuating cylinder cover forming and the research and preparation of future novel thin-wall parts and sheet metal forming parts.

The invention relates to a short-flow high-efficiency production method for white brass alloy pipes, belonging to the field of metal materials. In the method, a white brass pipe produced by virtue of a hot-cold-combined casting-mould horizontal continuous casting process is used as a blank; in a straight white brass pipe production process, the pipe blank is directly subjected to cold rolling with the total deformation amount of 50-90% and the single-pass deformation amount of not more than 20-25%; in a white brass coiled pipe production process, the pipe blank is subjected to the cold rolling deformation with the total deformation amount of not more than 50-70% and the single-pass deformation amount of not more than 20-25%, low-temperature recovery annealing is carried out at the temperature of 300-550 DEG C for 1-2 hours after the rolling is completed, an annealing protection atmosphere is formed by 2% of H2 and the balance of N2, and the annealed coiled pipe is bound to be subjected to once finishing in a serial continuous drawing way or triple continuous drawing before coil drawing; and in a subsequent coil drawing process, an average pass lengthening coefficient is 1.2-1.5, and the coil drawing speed is 1-1,000m/min. Compared with the traditional casting and rolling drawing method for producing the white brass pipes, the method provided by the invention has the advantages of short process flow, obviously decreased annealing frequency and low annealing temperature, and is beneficial to energy conservation and production efficiency improvement.

The invention relates to a forming die device for a sealing ring used in an engine. The device comprises a primary forming die and a final forming die, wherein the primary forming die specifically comprises a pressure plate, a first upper die, a first lower die, a supporting spring, an oil baffle pan, a base, an internal mold column, a sealing end cover, an oil guide pipe adapter, and the like; and the final forming die specifically comprises a pressure plate, a second upper die, an upper locking lantern ring, a lower locking lantern ring, a second lower die, an oil baffle pan, an intermediate model, a base, an internal mold column, a sealing end cover, and the like. The forming method for the sealing ring used in the engine comprises the following two steps of primary forming and final forming.

The invention relates to a copper-clad aluminum composite thin flat wire and a preparation method thereof. The copper-clad aluminum composite thin flat wire is composed of a core aluminum body and a pure copper cladding layer, and the pure copper cladding area ratio is 10% to 30%. , the thickness of the copper layer is evenly distributed, the minimum width of the cross-sectional dimension can reach 0.08mm, and the minimum thickness can reach 0.02mm. It is beneficial to reduce the volume and weight of the coil, and can meet the use requirements of micro-motor enameled wires for various precision micro-electrical appliances. The copper-clad aluminum composite thin flat wire is prepared by cold liquid extrusion to prepare copper-clad aluminum wire billet, combined with subsequent cold deformation strong processing (drawing, rolling) to prepare copper-clad aluminum composite thin flat wire, the prepared copper-clad aluminum composite thin The preparation process of the flat wire greatly reduces the number of annealing times, lowers the annealing temperature, and even does not need annealing according to needs, simplifies the production process, and reduces the production cost.

The invention relates to the field of preparation of aluminum and aluminum alloy strips, in particular to a high-strength high-surface anodic oxidation appearance aluminum alloy strip and a preparation method thereof. The high-strength high-surface anodic oxidation appearance aluminum alloy strip and the preparation method thereof mainly solve the technical problems of incapability of synchronously achieving high surface appearance and high strength because an aluminum profile in the prior art can achieve high strength through quenching and ageing after extrusion but an aluminum alloy strip can achieve strength through solid solution strengthening of solid solution elements and hardening given by cold rolling. The aluminum alloy strip comprises the following components in percentage by mass: 3.0-5.0 wt% of Mg, 0.1-1.0 wt% of Zn, no more than 0.05 wt%of Si, no more than 0.10 wt%of Fe, no more than 0.05 wt%of Mn,no more than 0.1 wt%of Cr, no more than 0.05 wt%of Ti, nomore than 0.10 wt%of Cu, and the balance Al, wherein Fe/Si=1-3.

The invention relates to an aluminum alloy plate strip preparation method based on vacuum centrifugal casting and a vacuum centrifugal casting device. The preparation method comprises the following steps that raw materials are prepared according to components of a target aluminum alloy; a cast pipe blank is cast in a vacuum centrifugal casting manner; the cast pipe blank prepared through vacuum centrifugal casting is split, the split cast pipe blank is leveled, and an aluminum alloy cast plate blank is obtained; and the aluminum alloy casting plate blank is rolled, and an aluminum alloy plate strip is obtained. According to the preparation method, under the action of centrifugal force, the feeding environment in the solidification process of aluminum alloy melt liquid can be obviously improved, and casting defects such as shrinkage porosity and shrinkage cavities can be effectively bridged under the action of the centrifugal force. Due to the fact that vacuum centrifugal casting is completed under the vacuum condition, a melt does not make contact with air, melt oxidation can be effectively avoided, the defect of oxide inclusion in the cast pipe blank is greatly reduced, and the quality of the pipe blank is improved.

The invention provides a processing method for processing a stainless steel thin-walled member applied in the field of processing of stainless steel thin-walled members. The method comprises: a step of continuous stretching for N times, a step of tempering treatment, and a step of alternated treatment of stretching for K-N times and tempering. By adopting twice continuous deformation stretching and then carrying out a process of once annealing treatment, the processing method reduces the annealing times so as to reduce the processing procedure, save the processing time and improve the processing efficiency.

The invention relates to an Mg-Al-Zn-Gd-Ce alloy and a preparing method and application thereof, in particular to an abrasion-resisting Mg-Al-Zn-Gd-Ce alloy, an Mg-Al-Zn-Gd-Ce alloy surfacing welding stick and a preparing method of the welding stick, and belongs to the technical field of metal material technologies and metallurgy. The Mg-Al-Zn-Gd-Ce alloy comprises magnesium alloy chemical components including, by mass percent, 2.47%-3.55% of Al, 0.29%-1.50% of Zn, 0.26%-0.56% of Mn, 0.80%-2.54% of Gd, 0.49%-2.38% of Ce, and the balance Mg. Under the room temperature dry friction abrasion test conditions, after the Mg-Al-Zn-Gd-Ce magnesium alloy welding stick is subjected to surfacing, the relative abrasion resistance of the Mg-Al-Zn-Gd-Ce magnesium alloy welding stick can reach 3.29.

The invention belongs to the metal material field and relates to a short-flow efficient production method of a pure copper tube. The technical scheme of the invention is as follows: the hot-cold combined moulding and continuous casting technology is adopted to efficiently produce the pure copper tube blank with an axial orientation structure and good inner surface quality and outer surface quality; subsequent shape processing is performed to the tube blank without adopting surface planing treatment; and intermediate annealing is not required in the processing process or little low-temperatureannealing is only required, so as to efficiently produce the pure copper tube. The hot-cold combined moulding and continuous casting technology is characterized in that a continuous casting crystallizer is combined by a heated hot moulding section and a cold moulding section which is forced to be cooled by the circulating water, and the solidification interface position of the tube is controlled to be near the borderline of the hot moulding section and the cold moulding section to efficiently prepare the tube blank with high surface quality and an axial orientation structure. The method has the advantages of short production process, low energy consumption, low cost, high yield and high production efficiency.

The invention discloses a cross rolling method of a molybdenum-copper alloy foil, cold rolling is performed on a molybdenum-copper alloy sintered plate billet in the thickness of 0.8-4mm multiple times, when the rolling deformation is 60-90%, 90-degree cross rolling is performed, the deformation is still controlled within 60-90%, and then annealing is performed on the cross-rolled foil, wherein the annealing temperature is 600-850 DEG C. The cross rolling can be continuously performed on the billet after annealing according to the requirement of the thickness of a product, and the cross rolling is performed once before every annealing. According to the cross rolling method disclosed by the invention, the surface cracking problem during the one-way rolling process can be effectively solved, the times of annealing can be reduced, and the high-density molybdenum-copper alloy foil in the thickness of 0.02-0.1mm can be prepared. The method has the advantages of low requirements on equipment, high production efficiency, low energy consumption and the like, and is suitable for mass production and rolling of the molybdenum-copper alloy foil.

The invention discloses an asynchronous cold rolling forming process of an aluminum alloy stainless steel composite plate. The process comprises the following process steps: 1, rolling and compoundinga stainless steel plate and an aluminum alloy plate in an asynchronous rolling mode, and 2, after asynchronous rolling, diffusing and annealing the composite plate, specifically, in the step 1, online heating is carried out on the opposite surface of the composite plate surface of the stainless steel plate, online cooling is carried out on the opposite surface of the composite plate surface of the aluminum alloy plate online, and the heating temperature is 350 DEG C-850 DEG C; the temperature of the composite plate surface of the stainless steel plate from which the composite plate is rolledis lower than 650 DEG C, and the temperature of the composite plate surface of the aluminum alloy plate from which the composite plate is rolled is lower than 300 DEG C; the rolling reduction rate is20%-90%; the different speed ratio of a roller for asynchronous cold rolling is 1.05-1.50; the thickness ratio of the aluminum alloy plate to the stainless steel plate is 1.5-4.0; and in the step 2, the annealing temperature is 250 DEG C-500 DEG C and the annealing time is 15-120 min. The single-side online heating process for rolling the composite plate is creatively provided so as to improve theinterface bonding strength of the composite plate and realize rolling compounding in an interface semi-melting state.

The invention discloses a cross rolling method for a tungsten-copper alloy foil. The method comprises the following steps of: performing multi-pass cold rolling on a tungsten-copper alloy sintering plate blank with the thickness of 0.8 to 3mm; when the rolling deformation amount is about 40 percent, performing 90-degree cross rolling, wherein the deformation amount is still controlled to be less than or equal to 40 percent; annealing the blank which is subjected to cross rolling at the temperature of between 700 and 900 DEG C; and performing cross rolling on the annealed blank continuously according to the thickness requirement of a product, wherein cross rolling is performed once every time before annealing. By the method, the problem that the surface is cracked in a one-way rolling process can be effectively solved, the annealing frequency is reduced, and the high-density tungsten-copper alloy foil with the thickness of 0.05 to 2mm can be prepared. The method has the advantages of low requirement on equipment, high production efficiency, low energy consumption and the like, is suitable for batch production, and tungsten-copper alloy of which the mass percentage of tungsten is 50 to 95 percent.

The invention discloses a method for preparing high-electric-conductivity pure copper strips for a transformer, belonging to the field of material manufacturing, for solving problems of longer preparation process and expensive required devices of the high-electric-conductivity pure copper strips in the prior art. The preparation method of the high-electric-conductivity pure copper strips for the transformer comprises the following steps of: distributing materials, melting materials, adding a copper phosphor intermediate alloy, and covering dry charcoal on liquid raw materials; transferring the liquid raw materials covered with dry charcoal in a heat preservation furnace at the temperature of 1180 DEG C-1280 DEG C, and keeping the temperature for 25-30 minutes; then carrying out horizontal continuous casting at the casting temperature from 1100 DEG C to 1200 DEG C by adopting pulling, stopping and returning technologies; and carrying out face milling, intermediate annealing after cold rolling and cogging, as well as roughing and reduction, secondary intermediate annealing, surface cleaning and passivation, cold finishing rolling, low-temperature thermal treatment for finished products, surface cleaning and passivation, stretch bending leveling, thus the required high-electric-conductivity pure copper strips are obtained. According to the invention, the existing uniform annealing working procedure is omitted, expensive devices are not required to be purchased additionally, the technology complexity is lowered, and the cost is lowered.

The invention relates to a preparation method of a zinc alloy pipe for a degradable cardiovascular stent, and belongs to the technical field of material preparation. The zinc alloy pipe comprises the following alloy components in percentage by weight: 0.05% of Mg, 0.2-0.5% of Mn, 0.1-0.5% of Cu, 0.02-0.05% of P, less than or equal to 10ppm of inevitable impurities and the balance of Zn. The preparation method comprises the following steps: (1) heating pure zinc to 550 +/-5 DEG C, adding other metals after melting, uniformly stirring, cooling the molten metal to 480 +/-10 DEG C, and casting; (2) preserving heat at 380 DEG C for 10-24 hours, and then cooling to room temperature in water; (3) conducting heat preservation for 30 min at the temperature of 150 DEG C, and then conducting hot extrusion forming at the temperature of 100 DEG C, wherein the extrusion speed is 0.2-1 mm/s; (4) conducting multi-pass hot drawing, wherein the accumulated deformation is 75-95%, the drawing speed is 0.2-10 mm/s, the drawing temperature is 100 DEG C, and the deformation of each pass is 10-15%; and (5) conducting cold drawing finishing and annealing treatment, and finally conducting air cooling to the room temperature. The preparation method of the zinc alloy pipe for the degradable cardiovascular stent is suitable for forming of various zinc alloy pipes so as to meet different use requirements.

The invention discloses a preparation method of a high-strength and high-toughness Cu-Nb-Cu composite wire, which comprises the following steps of: 1, carrying out annealing treatment on an Nb tube reinforced Cu-Nb, namely a Cu-Nb-Cu three-time composite wire prepared by adopting a bundling drawing method, and then carrying out groove rolling; 2, soaking the Cu-Nb-Cu three-time composite wire subjected to pass rolling in a foam tank filled with liquid nitrogen for cooling; and thirdly, the cooled Cu-Nb-Cu tertiary composite wire is subjected to plastic drawing, and the high-strength and high-toughness Cu-Nb-Cu composite wire is obtained. According to the method, the process of combining groove rolling with liquid nitrogen temperature zone drawing is adopted, the plastic deformation capacity of the Cu-Nb-Cu composite wire is improved, the superfine Cu-Nb-Cu composite wire is obtained, high strength is obtained, meanwhile, high toughness is achieved, the inversion relation between the material strength and plasticity is regulated and controlled, the process cost is saved, and batch production is easy to achieve.