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

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.

The present method for coating a Fresnel lens blank includes providing an uncoated Fresnel lens blank having a structure surface and a non-structured surface, providing a transparent mold part having molding surface substantially matching the base curvature of the Fresnel lens, depositing a metered quantity of coating resin between the molding surface and the structured surface of the Fresnel lens, applying pressure between the Fresnel lens and the mold part while maintaining the distance between the molding surface and the structure surface so that the thickness of the coating is greater than 1.5 times the Fresnel structural height of the structured surface and less than 5 times of the Fresnel structure height of the structured surface and curing the resin coating in situ by directing the incident UV radiation at the Fresnel lens. A double coating may be employed for obtaining both higher optical power and better mechanical properties.

The invention provides a cavity gas back pressure and temperature control device, mainly comprising a mold, a program control valve, a back pressure gas supply unit and a high temperature gas supply unit, wherein, the mole is provided with injection channels which penetrate to the cavity and at least one air passage, the program control valve is arranged in the air passage of the mold for controlling high temperature gas and/or high pressure gas to get in and out from the cavity through the air passage, the back pressure gas supply unit supplies back pressure gas to the cavity through the program control valve, and the high temperature gas supply unit supplies high temperature gas to the cavity through the program control valve. According to the invention, the surface of the cavity is heated by the high temperature gas supply unit through cooperative control, and back pressure is provided by the back pressure gas supply unit when injection molding, so that a finished product with good surface quality is obtained, and the foaming size and uniformity are controlled.

The invention relates to a preparation method of a seamless high-pressure gas cylinder. The preparation method comprises the following steps of 1, preparing a blank; 2, extruding the blank reversely to machine a rough tube blank; 3, carrying out precision forging and tube drawing to form a precision forging tube blank; 4, carrying out heat treatment on the precision forging tube blank; 5, carryingout spinning to prepare a tube, reducting the thickness of the tube blank subjected to precision forging to a required thickness by thickness reduction spinning equipment, forming the tube, and preparing annular reinforcing ribs integrally formed with the tube on the inner wall of the tube through spinning; and 6, sealing the opening by hot spinning, and preparing the gas cylinder. The inventionfurther relates to the seamless high-pressure gas cylinder prepared by the method, the inner wall of the gas cylinder is provided with the integrally-formed annular reinforcing ribs, so that the pressure-bearing capacity of the tube is improved, and the tube is attractive in appearance and easy to install; and materials are saved, the cost is low.

The invention relates to a slag system for smelting GH984G nickel base alloys and an application method thereof. The slag system comprises the following components in percentage by weight: 25-30% of CaO, 20-25% of Al2O3, 2-5% of MgO, 4-7% of TiO2, 1-3% of SiO2 and the balance of CaF2. The slag system is suitable for smelting GH984G high-temperature alloys through remelting of T-shaped crystallizeringot extracting electroslag. The slag system can preferably solve the problems of nonuniform distribution of easy-oxidized elements at the heads and the tails of ingots in the process of smelting the GH984G high-temperature alloys through remelting of the ingot extracting electroslag and weaker surface quality of ingots.

The invention discloses a preparation method for a carbon fiber reinforced polyimide resin composite material, and belongs to the field of material preparation. The preparation steps comprise: preparing a polyimide resin solution; setting parameters of a roller arrangement machine, and employing a roller arrangement method to prepare a prepreg; putting the prepreg at a ventilated shade place for air drying; cutting the dried prepreg into a demanded size, and laying up according to a set direction; heating and pressurizing the laid-up prepreg for solidification; and after solidification is finished, naturally cooling to obtain the carbon fiber reinforced polyimide resin composite material. The key point of the preparation method comprises that the carbon fiber reinforced polyimide prepreg is prepared in an appropriate parameter scope by setting the tension force of the roller arrangement machine, the roller rotating speed and other parameters. By utilizing the provided parameter scopes, the prepared carbon fiber reinforced polyimide prepreg is good in surface quality, carbon fiber is completely soaked by polyimide resin, and also the composite material prepared by using the prepreg for processing is superior in mechanical properties and good in heat resistance.

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.

The invention relates to a production method for a bar, in particular to a production method for a Gamma-TiAl alloy bar. The production method solves the problems that a Gamma-TiAl alloy bar produced by the prior method has the defects of surface cracks, uneven diameter, uneven size of crystal grains and easy fusion caused by the reaction of Gamma-TiAl alloy and blank at high extrusion temperature. The production method comprises the steps: heating a cast ingot, keeping temperature and annealing; cutting a cylinder in the cast ingot, packaging aluminum silicate fibers, placing in the middle of a stainless steel pipe, and sealing both ends to obtain the blank; washing the sheathed blank, drying and heating the sheathed blank, keeping temperature, placing the sheathed blank in the air, putting the sheathed blank into a cup pre-pressured by glass lubricant, putting the sheathed blank into a mould to extrude to obtain the bar; annealing the bar, taking the bar out of a blast furnace for air cooling, and obtaining the Gamma-TiAl alloy bar. The obtained bar has the advantages of no surface cracks, even diameter, even size of crystal grains and no fusion caused by the reaction of the Gamma-TiAl alloy and the sheath.

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.

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.

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.

The invention discloses a method for smelting a TA10 titanium alloy by using an electron beam cold hearth, and belongs to the field of titanium alloys. The method comprises the following steps that (1), materials containing titanium, nickel and molybdenum are mixed and pressed into a material block, and then the material block is dried; and (2) the dried material block is subjected to smelting byusing the electron beam cold hearth, and the TA10 titanium alloy is obtained. Electron beam cold hearth smelting comprises a gun starting stage, a casting ingot bottom making stage, and a stable smelting stage; and the electron beam cold hearth comprises a melting zone, a refining zone and a crystallization zone which are sequentially adjoined, the power of the melting zone in the stable smeltingstage is 800-1100 Kw, the power of the refining zone is 150-180 Kw, and the power of the crystallization zone is 180-210 Kw. The TA10 titanium alloy prepared through the method is good in element distribution uniformity and surface quality.

The invention discloses a multi-component rare earth magnesium alloy 3D printing process which adopts Mg-3.4-Y-3.6-Sm-2.6Zn-0.8Zr alloy powder. The printing process comprises the following steps of drying alloy powder before 3D printing; selecting a ZK61m alloy as a substrate material in printing, wherein the preheating temperature is 180 DEG C, and in a high purity argon atmosphere (the oxygen content is 10 ppm), the laser power is 30w, 40w, 50w and 60w, the scanning speeds are 200 mm/s, 300 mm/s, 400 mm/s, 500 mm/s and 600 mm/s, the powder paving thickness is 20 [mu]m, the laser hatch separation distance is 80 [mu]m, and the spot diameter is 60 [mu]m; and carrying out snakelike divisional scanning with a scanning track and carrying out rotation for 67 degrees layer by layer. By adoptinga substrate preheating and snakelike divisional scanning policy and reasonable process parameters, the problem of large residual stress in a 3D printing process is solved successfully. The density ofa prepared specimen is 84-98.6%, the surface quality is good and the alloy type is novel. Limit of raw materials in a current magnesium alloy 3D printing research process is broken. The multi-component rare earth magnesium alloy 3D printing process has higher scientific research value.

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.

The invention belongs to the technical field of steel plate manufacturing, and particularly relates to a hot-dip galvanized steel plate and a preparation method thereof. The hot-dip galvanized steel plate comprises the chemical components of, by weight, 0.07-0.13% of C, 0.01-0.06% of Si, 0.20-0.90% of Mn, 0.010-0.040% of P, 0.015% or the less of S, 0.020-0.070% of Als and the balance Fe and unavoidable impurities. The preparation method of the hot-dip galvanized steel plate comprises the steps that molten steel is smelted and continuously cast, and then a plate blank is obtained; and the plateblank is subjected to working procedures of hot rolling, acid rolling, annealing and hot dip galvanizing, and then the hot-dip galvanized steel plate is obtained. According to the hot-dip galvanizedsteel plate, the yield strength is 260-330 MPa, the tensile strength is 350-430 MPa, the elongation percentage is larger than or equal to 28.0%, n90 is larger than or equal to 0.15, mechanical properties and forming properties are excellent, and the hot-dip galvanized steel plate can meet the using requirements of automobile users.

The invention discloses a high-precision wire cut electrical discharge machining mechanism. The high-precision wire cut electrical discharge machining mechanism comprises a wire storage cylinder, a wire frame, a pulsed power supply, working fluid, a workpiece, an electrode wire and guide wheels; the electrode wire is pulled out from the wire storage cylinder and is driven to perform reciprocating rectilinear movement on the surface of the workpiece through the guide wheels which are fixed on the wire frame; the working liquid is sprayed on the electrode wire which is in contact with the surface of the workpiece; the workpiece is connected with a positive electrode of the pulsed power supply; the electrode wire is connected with a negative electrode of the pulsed power supply. According to the above mode, the high-precision wire cut electrical discharging machining mechanism adopts a wire conveying system which is formed by the four guide wheels, so that the high spatial position accuracy and stability of the electrode wire can be guaranteed, and purposes of good surface quality and cutting accuracy are achieved.

The invention relates to a hot-dipping Zn-Al-Mg alloy coating layer steel plate and a preparation method thereof, and belongs to the technical field of hot dipping. According to the hot-dipping Zn-Al-Mg alloy coating layer steel plate provided by the invention, a coating is prepared from the chemical components: 1.0 to 2.5 percent of aluminum, 1.1 to 2.8 percent of magnesium, less than or equal to0.015 percent of inevitable impurities, and the balance zin, wherein the weight ratio of Mg to Al is equal to 0.5 to 1.2. The preparation method comprises the steps of degreasing, cleaning, continuously annealing, hot dipping, purging through an air knife, cooling, finishing, carrying out surface treatment, and coiling. The hot-dipping Zn-Al-Mg alloy coating layer steel plate has excellent corrosion resistance, formability and coating performance, has favorable surface quality without adopting an N2 air knife, can be used as an inner part for a home appliance after being punched and formed, can be further applied to an outer part for the home appliance after being sprayed, and completely meets the use demands of home appliance users.

The invention provides a method for controlling the lapping speed of a silicon chip, which comprises the following steps: the silicon chip to be lapped is clamped to a lapping plate of a lapper, the surface of the silicon chip to be lapped is supplied with lapping liquid, the lapper is subjected to pressure and the lapping plate of the lapper is controlled to rotate, and the surface of the object to be lapped is lapped; the improvement of the method is that the lapping liquid used comprises abrasive filler, osmotic agent, pH regulator, surface active agent and deionized water; and the lapping pressure of the lapper is controlled below 50kPa, the rotating speed of an upper lapping plate is controlled below 200 rounds per minute, and the rotating speed of a lower lapping plate is controlled below 200 rounds per minute. The method can effectively improve the lapping speed for lapping the silicon chip, guarantee that the silicon chip has better surface quality after lapping, improve the production efficiency, and reduce the production cost.

The invention relates to a manufacturing method a ceramic-based composite part with three-stage pores. The manufacturing method includes: making a part resin shell with openings at two ends; preparing organic monomer, a crosslinking agent, carbon fiber and ceramic powder into suspension slurry, and pouring the suspension slurry into the part resin shell; arranging a temperature field to enable a solvent in the suspension slurry to being cooled, solidified and directionally crystallized along a temperature gradient direction, shelling after the suspension slurry is completely solidified for vacuum freeze-drying, holding temperature at 800-1200 DEG C in a vacuum condition, and removing organic matter to obtain a ceramic part porous body; using a CVD/CVI method to deposit a SiC interface layer on the surface of the carbon fiber inside the ceramic part porous body; in an oxygen-containing atmosphere, burning off the carbon fiber inside the ceramic part porous body to obtain the ceramic-based composite part. Quick forming technology and gel casting technology are combined to prepare a porous structure material with uniform pores in certain distribution direction.

The invention discloses a preparation method of of a ceramic core for directionally solidifying a niobium-silicon-based alloy hollow turbine blade. The preparation method comprises: S1, carrying out mixing on hafnium oxide powder, yttrium oxide powder and aluminium oxide crystal whiskers, and after obtaining ceramic powder, carrying out heat preservation; S2, according to a proportion of 80 to 95wt% of ceramic powder and 5 to 20wt% of a plasticizer, after adding the ceramic powder into the molten plasticizer, stirring for 2 to 10h, and after obtaining core slurry, cooling into a material cake;S3, melting the material cake at a temperature of 110 to 130 DEG C, preheating a die at a temperature of 35 to 45 DEG C, and pressing a ceramic core body by adopting a ceramic core green body; S4, placing the ceramic core green body in lightweight magnesium oxide to carry out de-waxing and roasting so as to obtain the ceramic core for directionally solidifying the niobium-silicon-based alloy turbine blade.

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.

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.

The invention discloses a technology for eliminating withdrawing and straightening lines on the surface of galvanized door plate steel. The technology comprises the steps of pickling, rolling, cover type annealing, flattening and galvanizing. The selected galvanized door plate steel comprises 0.01 wt% or less of C, 0.04 wt% or less of Si, 0.15-0.25 wt% of Mn, 0.02 wt% or less of P, 0.015 wt% or less of S, 0.015-0.055 wt% of Al, 0.004 wt% or less of N, and 0.001-0.002 wt% of B. The galvanizing is carried out after the rolling in a general technology for the galvanized door plate steel, the route of technology in the invention is afresh designed and is characterized in that trip steel does not enter the galvanizing line, enters a cover type annealing furnace and is completely annealed, so the defect of incomplete annealing of the strip steel in a galvanizing and continuous annealing furnace is avoided, and complete annealing realizes the elimination of the residual stress in the strip steel and thorough removal of the yield point elongation from the strip steel, thereby withdrawing and straightening line defects on the surface of the strip steel are improved and removed after the galvanizing.

The invention relates to a high-strength and high-precision cold drawing accurate grinding bar production technology. After a bar produced through a continuous casting and rolling technology is subjected to cold drawing, roundness is greatly improved, meanwhile, the strength of the bar is improved, and the needed mechanical performance is obtained. In addition, a machining hardening layer is formed on the surface, wear resistance of the surface of the bar can be improved, and the accurate grinding bar is obtained after rough grinding and accurate grinding machining, wherein the size precision is h7, the three-point out-of-roundness is smaller than a half of the tolerance, and the surface roughness is smaller than or equal to Ra 0.2 microns.

The invention relates to a production method for high-yield-strength-grade TRIP690+Z steel. The method comprises the steps of heating a slab, performing hot rolling, performing acid rolling, performing hot galvanizing and performing finishing, withdrawal and straightening. Due to the reasonable composition design, key technological parameters of step segments are effectively controlled, the multi-phase structure balance ratio is realized, the steel is prepared from 40-60% of a ferritic structure, 30-50% of a bainite structure and not smaller than 8% of retained austenite structure, the TRIP690+Z steel product with the good surface quality and the yield strength grade being 490-530 MPa is produced, the thickness specification range of the steel product is 0.8-2.0 mm, the tensile strength islarger than 690 MPa, the yield ratio is larger than 0.68, the elongation ratio A 80 is larger than 20%, n is not smaller than 0.19, and the hole expansion rate lambda is not smaller than 85%, and themethod is particularly applicable to manufacturing reinforcers and anti-collision parts for complex automobiles with the special requirements for the good corrosion resistance, the good surface quality, flanging, chambering and the like.

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.

The invention relates to the technical field of zinc-copper-titanium alloy wire material, and discloses a zinc-copper-titanium alloy wire material for electric arc spraying and a preparation process thereof, wherein the preparation method includes the following steps: 1) refining an intermediate alloy, and melting uniformly the intermediate alloy with the weight ratio of metals zinc, copper and titanium of 55:45:5 in a vacuum induction furnace; 2) melting a zinc ingot, melting the zinc ingot with the purity of 99.99% in the vacuum induction furnace, after completely melting, fully stirring, and degassing and deslagging by a special refining agent; 3) preparing an alloy wire blank by a continuous casting and hot continuous rolling method; and 4) annealing and cooling the alloy wire blank, to produce the zinc-copper-titanium alloy wire material. According to the zinc-copper-titanium alloy wire material for electric arc spraying and the preparation process thereof, the prepared zinc-copper-titanium alloy wire material has good surface quality and moderate hardness and meets the standards of electric arc spraying construction; at the same time, the zinc-copper-titanium alloy wire material product has moderate cost, is suitable for large-scale production and has prospect of vigorous promotion.

This invention involves a drip gas boronizing approach. The method contains the steps of: adopting ordinary drip gas carburizing furnace, heating the furnace to the temperature for boronizing, and dropping boriding agent containing trimethyl borate, methanol and chloridated rare earth and methanol to the furnace, decomposing and to form boride on the steel surface through adsorption and diffusion of boron atom decomposed by trimethyl borate. The invention has the advantage of uniform and compact leaking layer, good surface quality, Layer depth and surface boron content can be controlled; no need of cleaning workpiece after infiltration, with directly quenching after infiltration and low labor intensity; penetration enhancers without rank poison, non-explosive, with relatively good and safe, reliable working environment, without specialized equipments, commonly used carburizing furnace can meet the requirements, can handle all sorts of shapes and sizes workpiece, can be easy to achieve automatic control, with high efficiency, easy operation and high applicability.

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.

The invention discloses a wax mold casting technology and belongs to the technical field of wax mold casting. The technology comprises the following steps that firstly, a wax mold is manufactured, wherein the shape of the wax mold is consistent with that of a casting; secondly, a reinforcing agent is sprayed to the surface of the wax mold; thirdly, the wax mold is put into a large pot containing clean water to be boiled; fourthly, a shell mold is sleeved with a fixing shell, and dry sand is added between the shell mold and the fixing shell for fixing the shell mold; fifthly, the shell mold obtained in the fourth step is dried; and sixthly, smelted molten metal is poured into the shell mold, then cooling and shelling are conducted, and the molded casting is obtained. The surface quality of the casting is good, and the precision is high; a wax mold shell is high in strength and is not likely to be damaged, and the modeling success rate is high; and processes of the wax mold casting technology are simple, and the labor intensity is low.