46results about How to "High tissue density" patented technology

The invention belongs to the technical field of metallurgy, and particularly relates to a process for controlling center porosity of a large and round continuous casting billet. The process comprises steps as follows: qualified molten steel in tundish is injected into a mold through a four-slitting sided cyclone submerged nozzle; mold fluxes are added, and the depth of the submerged nozzle of the mold is controlled to range from 110 mm to 130 mm; a mold liquid level automatic control system is used for stabilizing a mold liquid level and a pulling rate, and the superheat degree of the molten steel in the tundish is stabilized; the secondary cooling speed of a casting billet is controlled; and M-EMS (mold electromagnetic stirring) and F-EMS (final electromagnetic stirring) parameters are optimized. With the adoption of the process, the large and round billet is produced, melting of the mold fluxes is facilitated, the temperature gradient from a billet shell to molten steel at the core part of the casting billet can be reduced, the overheat degree of the molten steel in the center is decreased, the isometric crystal proportion of the casting billet is increased, the tissue density of the casting billet is increased, and the grade of the center porosity of the large and round continuous casting billet can be controlled.

The invention relates to a furnace building method of an intermediate-frequency induction furnace for copper alloy smelting, which comprises the following steps: firstly, preparing a lining material of a furnace-body outer lining and a fire-door lute, and laying a layer of epoxy plate and placing an induction coil on an asbestos board base; laying a glass fiber fabric on the inner wall of the induction coil and the epoxy plate, so that the glass fiber fabric is formed into a pocket shape; hierarchically adding the lining material of the furnace-body outer lining into the glass fiber fabric pocket, and hierarchically tamping and knotting the obtained product so as to form a furnace bottom; then, placing a graphite crucible on the midmost position of the furnace bottom and compacting the furnace bottom; hierarchically adding the lining material of the furnace-body outer lining into a space between the glass fiber fabric bag and the graphite crucible, and tamping and knotting the lining material so as to obtain the furnace-body outer lining, so that the top surface of the furnace-body outer lining is lower than the top surface of the graphite crucible and the top surface of the induction coil; adhering a fire door to the top surface of the graphite crucible through the fire-door lute, filling the fire-door lute between the fire door and the glass fiber fabric bag, and carrying out tamping and flattened-brushing on the fire-door lute so as to obtain a fire-door outer lining; carrying out sintering on the outer lining by using an oven, so that silica has crystal transformation; and after the whole furnace is hardened, stopping heating so as to complete the furnace building. The method disclosed by the invention has the characteristics of high strength, good furnace-body combined performances and long service life.

The invention belongs to the technical field of powder metallurgy, and discloses a preparing method for a novel W-Mo-Cr alloy polishing disk. The preparing method comprises the following steps that powder W, powder Mo, powder Cr and powder Y are evenly mixed, and alloy polishing disk raw materials are obtained; secondly, a high-powered ball mill is utilized for conducting ball milling on a stainless steel ball and the alloy polishing disk raw materials, and alloy powder is obtained; thirdly, the alloy polishing disk is prepared through vacuum heat pressing and sintering; and fourthly, the alloy polishing disk is finished, the alloy polishing disk end face with the bright, clean and smooth surface is obtained, and the novel W-Mo-Cr alloy polishing disk is prepared. The preparing method has the beneficial effects that the novel W-Mo-Cr alloy polishing disk is excellent in sintering effect, high in structure density, uniform in component distribution, high in hardness and high in preparing repeatability.

A lead-acid storage battery electrode grid, which includes a lead substrate, a number of uniformly distributed mesh holes are punched on the substrate, a frame is respectively arranged around the substrate, and an outwardly protruding tab is provided on one of the frames. After the electrode grid of the present invention is used on a lead-acid battery, the mesh of the electrode grid is filled with active electrolytic substances, and the current generated by the oxidation-reduction reaction of the active electrolytic substances is transmitted through the tabs to achieve the purpose of power supply; the electrode of the present invention The grid uses rolled lead strips, the structure density is much higher than that of the cast grid with loose structure, which is more corrosion-resistant and effectively prolongs the service life of the battery; under the condition of ensuring the electrical conductivity, the grid ribs of the present invention can be compared with the cast grid It is thinner and saves lead consumption of the grid. The invention also provides a manufacturing process of the lead-acid storage battery electrode grid, which has the advantages of energy saving, environmental protection, high production efficiency and saving grid consumption.

The invention discloses a microcrystalline and high corrosion resistance type titanium alloy pipe and a preparation method thereof, and belongs to the technical field of titanium alloy pipes. According to the technical scheme, the preparation method is characterized by comprising the steps of preparing titanium sponge as a raw material; controlling the following chemical components in percentage by mass: 5.0-7.0% of Al, 2.0-3.0% of Nb, 0.5-2.0% of Zr, 0.7-1.2% of Mo, 0.02-0.05% of Fe, 0.01-0.03% of Si, and the balance Ti; smelting and forging to obtain a pipe blank; maintaining the temperatureof 990-1040 DEG C for 60-120min; performing cross piercing rolling; cooling; maintaining the temperature of 700-900 DEG C for 20-40min; rolling to obtain a pre-fabricated pipe; annealing for 30min to2h under the temperature of 350-550 DEG C; and cooling to obtain the pipe. The pipe structure contains an alpha phase and a beta phase; the grain size of the alpha phase is 0.5-1 micron; the grain size of the beta phase is 0.1-0.3 microns; and the intensity, the toughness and the corrosion resistance are greatly improved.

The invention relates to an aluminum alloy wheel liquid forging and spinning processing system, which comprises liquid forging equipment, a heat treatment device, a machining device and a spinning device, wherein aluminum alloy wheel workblanks produced by a liquid forging machine sequentially pass through the heat treatment device, the machining device and the spinning device. The aluminum alloy wheel liquid forging and spinning processing system has the advantages that the liquid forging is utilized for improving the spoke performance, and the spinning processing is utilized for improving the wheel rim performance, so that the integral performance of a wheel product is improved, the product performance is improved, the rejection rate is reduced, the cost is reduced, and the integral production efficiency is improved.

The invention relates to a 2Al2 aluminum alloy casting process. Firstly, intermediate alloys including a copper-aluminum alloy, an aluminum-manganese alloy and an aluminum-titanium alloy are prepared and smelted; then pure aluminum is arranged in a crucible, the copper-aluminum alloy, the aluminum-manganese alloy and the aluminum-titanium alloy are added in batch and in sequence, and sufficient stirring while adding is carried out; magnesium metal is added into the crucible, and aluminum alloy liquid is prepared; the aluminum alloy liquid is subject to refining, slag removal and modification treatment; after sampling analysis is qualified, pouring is carried out, and crude workpieces are prepared; the crude workpieces are settled and corrected; and the crude workpieces are arranged in an aging oven to be subject to aging treatment, and a finished product is prepared through slinging treatment and machining. The 2Al2 aluminum alloy casting process has the beneficial effects that operation is convenient, the workpieces are molded through casting, raw materials can be saved, the production cost is reduced, the casting tissue density is good, the degree of finish is high, the workpiece quality is good, the size deformation is small, the finished product rate is high, and the production efficiency is high.

The invention discloses a method for preparing a lead-base layer-shaped composite material and belongs to the technical field of preparing composite materials. Metal sheets of different specifications are used as inner core reinforcing bodies, a low-pressure casting method is used for enabling lead and alloy materials of the lead to wrap the metal sheets with inner cores of different specifications, and therefore the metallurgy-combined lead-base layer-shaped composite material is prepared. The lead-base layer-shaped composite material produced through a low-pressure casting technology is good in mold filling and feeding effect, the material organization of the produced lead-base composite material is compact, the mechanical property of the product is high, and the combining rate of compound interface layers can reach more than 95 percent. Compared with a traditional lead-base composite material preparing method, one-time forming can be achieved through the low-pressure casting method, the technological process is shortened, the production efficiency of the product is greatly improved, and labor intensity is lowered.

The welding manufacturing method of the large-scale cast-welding structure loop cable clamp of the present invention adopts welding materials and welding methods that match the cable clamp body and ear plates, controls the preheating before welding and the interlayer temperature, and selects appropriate welding process parameters to The cross cable lugs, membrane cable lugs and strut lugs are welded to the ring cable clamp body, which not only ensures the mechanical properties of the welded joints, but also greatly improves the production efficiency and saves manufacturing time; adopts groove design and welding sequence control Measures such as these ensure the manufacturing and installation accuracy of the weld seam of the hoop and cable clamp and reduce welding deformation; the method of overall stress relief annealing after welding reduces the internal stress of the weld seam and the entire cable clamp.