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53results about How to "good surface quality" patented technology

Ceramic tube inner surface polishing device and method

The invention relates to the technical field of ceramic tube inner surface ultra-precision machining, in particular to a ceramic tube inner surface polishing device and method. The ceramic tube inner surface polishing device comprises a lathe, a magnetism gathering device, a peripheral magnetic pole, a peripheral magnetic pole support, an auxiliary magnetic pole, an L-shaped bevel gear angle rotator, a transmission shaft, an auxiliary magnetic pole support, a high-speed motor, a high-speed motor bracket and a photoelectric limit switch. The magnetism gathering device, the peripheral magnetic pole and the peripheral magnetic pole support are fixed to a sliding box a of the lathe. The high-speed motor, the transmission shaft, the L-shaped bevel gear angle rotator and the auxiliary magnetic pole are connected in sequence and are fixed to a sliding box b of the lathe. A ceramic tube generates rotational motion under the action of the lathe. The high-speed motor drives the auxiliary magnetic pole to rotate. The auxiliary magnetic pole and the peripheral magnetic pole synchronously conduct axial feeding. Magnetic grinding particles and the inner surface of the ceramic tube part move relatively, so that ultra-precision machining of the inner surface of the ceramic tube is completed. The ceramic tube inner surface polishing device is high in machining precision and can be widely applied to polishing of inner surfaces of ceramic tubes.
Owner:UNIV OF SCI & TECH LIAONING

Thin thermoformed steel with tensile strength being not lower than 1700 MPa directly rolled by sheet billet and production method of thin thermoformed steel

The invention provides thin thermoformed steel with tensile strength being not lower than 1700 MPa directly rolled by a sheet billet. The thin thermoformed steel with tensile strength being not lower than 1700 MPa directly rolled by the sheet billet comprises the following components, in percentage by weight, 0.26-0.30% of C, 0.31-0.35% of Si, 1.3-1.5% of Mn, not higher than 0.008% of P, not higher than 0.005% of S, 0.015-0.060% of Als, 0.31-0.35% of Cr, 0.031-0.035% of Ti or 0.031-0.035% of Nb or 0.031-0.035% of V or a mixture mixed by more than two of the three components in any proportion, 0.003-0.004% of B, 0.20-0.25% of Mo, 0.06-0.10% of Ni and not higher than 0.005% of N. The production method of the thin thermoformed steel comprises the steps of desulfurizing molten iron; smelting the molten iron by an electric furnace smelting or a rotating furnace and refining the molten iron; performing continuous casting; performing descaling treatment before putting the molten iron into a soaking pit furnace; performing soaking; performing heating; performing high pressure water descaling before putting the molten iron into a rolling mill; performing rolling; performing cooling; performing coiling; performing austenitizing; performing mould stamping forming; and performing quenching. The steel is high in strength, short in manufacture process and good in quality of product surface, the accuracy of thickness can be controlled within +/-0.03mm and the energy consumption can be greatly reduced; moreover, the steel has great significance to realize automobile lightweight.
Owner:武汉钢铁有限公司

Novel nickel-chromium-cobalt-molybdenum high-temperature alloy seamless tube for power station and manufacturing method

PendingCN111636013AAvoid uneven deformationgood surface quality
The invention discloses a novel nickel-chromium-cobalt-molybdenum high-temperature alloy seamless tube for a power station. The novel nickel-chromium-cobalt-molybdenum high-temperature alloy seamlesstube comprises the following components in percentage by weight: 0.03-0.10% of C, less than or equal to 1.0% of Si, less than or equal to 0.70% of Mn, less than or equal to 0.012% of P, less than or equal to 0.008% of S, 20.00-24.00% of Cr, 10.00-15.00% of Co, 0.70-1.50% of Al, 0.20-0.70% of Ti, 8.00-10.00% of Mo, less than or equal to 2.00% of Fe, less than or equal to 0.5% of Cu, 0.001-0.006% ofB, less than or equal to 0.005% of Pb, less than or equal to 0.005% of Sb, less than or equal to 0.001% of Bi, less than or equal to 0.010% of Sn, less than or equal to 0.010% of As and the balance Ni and trace elements, wherein the sum of the components is 100%. According to the nickel-chromium-cobalt-molybdenum high-temperature alloy seamless tube disclosed by the invention, a certain amount ofCo, Mo, B and other elements are added by controlling and limiting the components, a smelting process adopts vacuum induction and vacuum self-consumption, a tube manufacturing process adopts hot extrusion and full cold rolling, and finally solution treatment is performed; and by adopting the way, the alloy seamless tube has good structure stability, mechanical properties and process properties and can meet the using requirements of a heat exchange tube for the novel power station.
Owner:JIANGSU YINHUAN PRECISION STEEL TUBE CO LTD

Niobium alloy target material and preparation method thereof

The invention provides a preparation method of a niobium alloy target material. The preparation method comprises the steps: firstly, carrying out hot extrusion of a niobium alloy tube blank, then carrying out inner hole processing of the niobium alloy tube blank after hot extrusion, and thus obtaining the niobium alloy target material. In the preparation process of the niobium alloy target material, firstly, the surface of the niobium alloy tube blank is coated with a glass powder; because the surface of the niobium alloy tube blank is spray-coated with the glass powder, the niobium alloy tube blank is allowed to have relatively good lubrication effect in the hot extrusion process, and thus the surface quality of the niobium alloy tube blank is relatively good; the subsequent hot extrusion processing and heat treatment are conducive to refinement and homogenization of crystal grains of the niobium alloy tube blank; and finally, the niobium alloy tube blank after hot extrusion is subjected to mechanical processing, and an inner hole of the niobium alloy tube blank is bored and milled by selected special tools, so that chip breaking can be allowed to be continuously discharged from the inner hole, the problem that chip breaking is accumulated in the inner hole to affect processing of the inner hole surface is avoided, and thus the niobium alloy target material with uniform and fine internal crystal grains and relatively low surface roughness value is obtained. The invention also provides the niobium alloy target material.
Owner:NINGXIA ORIENT TANTALUM IND

75Cr hot-rolled plate coil produced from thin sheet billets through continuous casting and continuous rolling and production method thereof

ActiveCN103643122Agood surface qualityUniform tissue performance
The invention discloses a 75Cr hot-rolled plate coil produced from thin sheet billets through continuous casting and continuous rolling and a production method thereof. The 75Cr hot-rolled plate coil comprises the following chemical ingredients in percentage by weight: 0.73-0.78% of C, 0.25-0.40% of Si, 0.65-0.90% of Mn, not higher than 0.020% of P, not higher than 0.012% of S, 0.30-0.60% of Cr, 0.015-0.03% of Als and the balance of Fe and inevitable impurities. The production method has the advantages that the production problems of large liquid level fluctuation, caking, unstable heat flow and the like appearing during the continuous casting of thin sheet billets under the condition of high pulling rate and the quality problems of surface crackle, center segregation, center porosity and the like of casting blanks are solved, and a stable production technology for 75Cr steel in a thin-sheet continuous casting and continuous rolling production line is realized. The 75Cr plate coil has the advantages that the surface quality is good, cracks and slag inclusions are not discovered, the structure property is uniform, the tensile strength is 920-1010MPa, the yield strength is 490-820MPa, the elongation percentage is 13-24%, and the Brinell hardness is 270-320HBW.
Owner:HEBEI IRON AND STEEL

Preparation method of nickel-chromium-based precision resistance alloy foil

The invention discloses a preparation method of a nickel-chromium-based precision resistance alloy foil, and belongs to the technical field of resistance alloy manufacturing. The preparation method comprises the following specific steps that a flat billet is heated, hot rolling is carried out on the flat billet for 7 or 9 passes to obtain a strip billet with the thickness of 5.5 - 6.0 mm; heat preservation is carried out after homogenizing annealing treatment is carried out on the strip billet, and then rough rolling is carried out; thick semi-finished product rolling is carried out on a ground strip billet on a four-high rolling mill, rolling is carried out for three times, the rolling thickness is 0.45 - 0.50 mm, surface abrasive belt cleaning is carried out on a strip, then thin semi-finished product rolling is carried out on the strip on a 20-high rolling mill, and surface polishing is carried out on the rolled strip; and finally, finish rolling is carried out on the strip on a 32-high rolling mill to obtain a finished foil with the thickness of 0.01 - 0.02 mm. The preparation method of the nickel-chromium-based precision resistance alloy foil has the advantages that the pinhole defect caused by the steel purity problem of the finished foil is avoided, surface oxide layer and defect treatment is more thorough, and oxide skin particles left on the surface can be removed favorably, so that the surface quality is improved.
Owner:BEIJING BEIYE FUNCTIONAL MATERIALS CORP

High-hardness coating surface rapid finishing device and method

The invention relates to a high-hardness coating surface rapid finishing device and method. A rotating bed base plate of the device is provided with a spindle chuck for positioning a workpiece to be processed and a tailstock arranged opposite to the spindle chuck; the rotating bed base plate is further provided with a reciprocating machine and a grinding head assembly for processing a high hardness coating surface of a cylindrical shaft part to be processed; the reciprocating machine comprises a reciprocating machine shell, a screw nut is arranged in the reciprocating machine shell, the screwnut is mounted at the middle portion of a lead screw, the reciprocating machine shell is provided with an avoiding hole which is matched with the lead screw to be assembled, the diameter of the avoiding hole is larger than the diameter of the lead screw, the upper part of the reciprocating machine shell is mounted with a mounting seat, and the grinding head assembly is mounted on the mounting seat; and the grinding head assembly comprises a grinding head and a grinding head mounting machine case, and the grinding head is mounted in the grinding head mounting machine case through a grinding head pressure pretensioning device. The high-hardness coating surface rapid finishing device and method solve the problems that a traditional grinder machine is extremely low in HV1200 or more high-hardness coating efficiency, the surface has vibration lines, the cylindricity is prone to being overproof, a diamond grinding wheel is seriously abraded, and cost is high; and the processing efficiency ishigh, and the coating surface quality is good.
Owner:湖北超卓航空技术有限公司

Dynamic pressure supporting device and method for thin-wall part processing

ActiveCN109848724Agood surface qualityStrong shock absorption
The invention relates to a dynamic pressure supporting device and a method for thin-wall part processing, and belongs to the technical field of precision processing and supporting. The dynamic pressure supporting device comprises a processing system and a dynamic pressure system, wherein a cutter of the processing system is positioned at a processing side of a workpiece and connected with a servofeeding system, and the workpiece is positioned between the cutter and the dynamic pressure system; a roller in the dynamic pressure system is positioned at the supporting side of the workpiece and immersed in lubricating oil; a wedge-shaped gap is formed between the roller and the workpiece; the roller is driven to rotate by a motor to form a dynamic pressure oil film on the surface of the workpiece, so the flexible support for the workpiece is realized; the lubricating oil is injected into an oil supply tank through an oil supply port on the oil supply tank and sealed by a flexible film. According to the invention, the workpiece can be separated from the roller by the dynamic pressure oil film, the roller does not contact with the workpiece directly, so scratches are not generated on thesurface of the workpiece. Meanwhile, the oil film has strong vibration absorption, which can effectively inhibit chatter during machining and improve the surface quality of the machined workpiece.
Owner:DALIAN UNIV OF TECH

Low-temperature prewarming and flattening method of normalizing furnace

InactiveCN101451184BImprove the curvaturegood surface quality
The invention discloses a low-temperature preheating flattening method for a normalizing furnace, which comprises the following steps: firstly, the heating temperature of the normalizing furnace of steel is between 450 and 650 DEG C, and the total heating time is 1.2 minutes per millimeter; and secondly, when a steel plate enters the furnace, a slow-charging and quick-discharging method is adopted, wherein the charging speed is between 0.007 and 0.125 meter per second, and the discharging speed is between 0.1 and 0.5 meter per second; and impurities such as sheet iron on the surface of the steel plate are blown to be clean by blowing before straightening. The method can eliminate partial internal stress of the steel by adoption of lower heating temperature, so as to be favorable for straightening the steel plate. Moreover, because the heating temperature is lower, the temperature of the steel plate is lower after straightening and the possibility of generating re-buckling due to nonuniform cooling when the steel plate is conveyed and cooled is greatly reduced, thereby the straightening effect of the method on thin and wide plates can be better. Simultaneously, the lower heating temperature is very important to reduce the energy consumption. The method meets the technical condition requirements of a user contract, and creates great benefit when simultaneously reducing unscheduled investment of factories.
Owner:WUYANG IRON & STEEL

Online switching method aluminum-zinc-magnesium coated steel plate and preparation method thereof

ActiveCN111270183Agood surface qualityNot easy to slagging
The invention relates to the technical field of hot-dip coating, in particular to an online switching method aluminum-zinc-magnesium coated steel plate and a preparation method thereof. The online switching method aluminum-zinc-magnesium coated steel plate comprises a steel plate substrate and an aluminum-zinc-magnesium coating located on the surface of the steel plate substrate. The online switching method aluminum-zinc-magnesium coated steel plate is characterized in that the aluminum-zinc-magnesium coating comprises, by mass percent, 51-55% of Al, 1.0-1.2% of Mg, 0-0.2% of Si, 0.02-0.05% ofRe and the balance Zn and other inevitable impurities. The preparation method comprises the following steps that the zinc liquid component in a main pot is adjusted to obtain an aluminum-zinc-magnesium plating solution; and a strip steel substrate is put in the aluminum-zinc-magnesium plating solution in the main pot to be subjected to hot-dip coating, and the aluminum-zinc-magnesium coated steelplate is obtained. According to the online switching method aluminum-zinc-magnesium coated steel plate and the preparation method thereof, based on the aluminum-zinc-magnesium plating solution, the components of the plating solution in the main pot are subjected to online switching, related technological parameters are adjusted, the step for extracting zinc liquid from the main pot is omitted, and the obtained aluminum-zinc-magnesium coated steel plate is high in corrosion resistance; and the strength of bonding between the coating and the steel plate substrate is high, the coating is difficult to peel, and the aluminum-zinc-magnesium coated steel plate can adapt to poor working conditions.
Owner:SHOUGANG JINGTANG IRON & STEEL CO LTD
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