143results about How to "Reduce grinding process" patented technology

The invention discloses a method for producing cord steel, which comprises smelting, refining, continuous casting and rolling and specifically comprises the following steps of: 1, adding waste steel and molten iron raw materials into a converter, and raising quality requirements for the molten iron and the waste steel; 2, smelting the raw materials in the converter, and controlling the aim carbon content to be 0.30 to 0.70 percent; 3, controlling steel tapping; 4, refining the steel; 5, continuously casting billets, electromagnetically stirring the billets by using a crystallizer, and controlling the continuous casting pulling speed to be 2.0 to 2.6m / min; and 6, rolling wires at high speed, and rolling the billets to form cord steel coil rods by using a high-speed wire mill. The method saves the processes of molten iron desulfuration or molten iron three-removal pretreatment and RH or VD vacuum treatment of molten steel, saves electromagnetic stirring of two cooling zones and electromagnetic stirring of a tail end in continuous casting production, saves primary rolling cogging and steel ingot polishing, improves the yield, realizes reduction of cost, and saves energy.

The invention provides a method for producing silicate cement by using silico-calcium dregs and carbide dregs, relating to the technical field of building materials. The method has the following steps: 1. adding carbide dregs and water into silico-calcium dregs followed by dealkalization and carrying out pressure filtering and drying on the dealkalized silico-calcium dregs if the alkali content in the silico-calcium dregs is high, or directly drying the silico-calcium dregs if the alkali content in the silico-calcium dregs is low; and drying the carbide dregs and desulfurated plaster respectively; 2. dosing and homogenizing the dealkalized silico-calcium dregs and carbide dregs after drying; 3. sending the homogenized crude materials into a rotary kiln for high temperature calcinations and obtaining the cement clinker after cooling; and 4. smashing the cement clinker and sending the smashed cement clinker and the dried desulfurated plaster into a cement grinding mill for grinding to prepare the silicate cement. Compared with the prior art, the method of the invention is simple in process, low in investment, low in production cost, low in energy consumption, and stable in the prepared silicate cement performance.

The invention relates to an inorganic high temperature protection coating technology, particularly to a high-temperature oxidation resistant and corrosion resistant glass ceramic composite coating which can be used for components made of titanium alloy and other metallic materials and a preparation technology of the composite coating. The coating is formed through uniformly dispersing and distributing micron scale ceramic particle phase and nanoscale metal / oxide mixed powder into a glass matrix phase, the glass matrix phase is formed through performing high temperature conversion on sodium silicate water glass or potassium silicate water glass, the micron phase ceramic particle phase accounts for 15-60 wt% of the glass ceramic composite coating, and the nanoscale metal / oxide mixed powder accounts for 0.5-5 wt% of the glass ceramic composite coating. The coating preparation technology comprises the steps of coating material preparation, coating material spraying and high temperature processing. The glass ceramic composite coating, provided by the invention, is compact, has no holes, has higher strength and breaking tenacity, and has good binding force with a titanium alloy matrix and thermal expansion coefficient matched with the titanium alloy matrix, thereby having excellent anti-thermocycling thermal shock performance, high-temperature oxidation resistance and corrosion resistance.

The invention provides a horizontal lathe for machining a cylindrical eccentric part and a method adopted by the horizontal lathe, which relate to a machining mechanism for machining the cylindrical eccentric part, in particular to a horizontal lathe for machining the cylindrical eccentric part and a machining method of the cylindrical eccentric part. Through the horizontal lathe and the machining method, the machining efficiency and the machining accuracy of the cylindrical eccentric part are improved; the production cost is reduced; the machining of the cylindrical eccentric part by the horizontal lathe is realized; and the needs for machining the cylindrical eccentric parts with different specifications and lengths are satisfied. The horizontal lathe comprises a horizontal lathe, and one side of a lathe body of the horizontal lathe is provided with a lathe headstock and the other side thereof is provided with a lathe tailstock; the lathe headstock is provided with a clamping disk with clamping jaws; correspondingly, the lathe tailstock is provided with a tip; and a tool feed rest is arranged on a guide rail of the lathe body between the lathe headstock and the lathe tailstock. The horizontal lathe has structural key points as follows: a roller support transmission combined with the guide rail of the lathe body is arranged; and the tool feed rest is used for fixing an excircle turning tool or an inner-hole turning tool.

A manufacturing method of an iron-type golf club head has acts of preparing a formed bar-shaped steel substrate, rough-hot forging the bar-shaped steel substrate, mid-hot forging the rough blank, fine-cold forging the mid-blank, cold stamping the striking surface and drilling a hosel of the iron-type golf club head. The cold forging reduces the thermal expansion and contraction of the blank, and the shape of the forged blank is more accurate therefore. As a result, the following grinding processes of the blank are reduced. Therefore, the weight of the blank is more accurate, and the manufacturing time and cost are also reduced. The blank does not have to be heated to high-temperature state prior to cold forging so that the blank can be cooled down faster, and the cost of the heating is reduced.

The invention relates to the field of polishing processing and in particular relates to gear polishing equipment. The gear polishing equipment comprises a rack, a main polishing mechanism, a supporting mechanism and a secondary polishing mechanism, wherein a sliding groove is formed in the bottom of the rack; the main polishing mechanism comprises a motor case, a motor and a ball screw pair; the ball screw pair comprises a rotary rod, a ball nut, a gear and a toothed rod; a main polishing wheel sleeves the toothed rod; the supporting mechanism comprises a supporting seat and a supporting rod;channels are formed in the supporting seat and the supporting rod; airbags are mounted in the channels; a through hole is formed in the supporting rod; a wedged block is mounted in the through hole; the secondary polishing mechanism comprises a base and a connection rod; the connection rod is provided with a secondary polishing wheel; polishing discs are mounted at two sides of the secondary polishing wheel; an electromagnet is arranged at one side of each polishing disc; the electromagnets are fixed on the rack through fixed rods; the supporting seat and the motor case slide in the sliding groove. According to the gear polishing equipment provided by the invention, when a gear is polished, planes at two sides of the gear can be polished, and a toothed surface of the gear also can be polished at the same time.

The invention discloses a book gluing device which comprises a paper feeding mechanism, a content paper clamping mechanism, a coating mechanism and a cover compressing mechanism, wherein the paper feeding mechanism comprises a paper inlet, an upper part channel, a lower part channel as well as a reversing mechanism arranged among the paper inlet, the upper part channel and the lower part channel, and is used for exchanging and connecting the paper inlet to the upper part channel or the lower part channel. The book gluing device is provided with the reversing mechanism through the paper inlet so as to exchange the communicated states of the paper inlet and the upper part channel and the lower part channel, so that the content paper and the cover are conveyed to the appropriate position; pages are glued twice through moving a glue pot, and the size of the gluing device is reduced effectively; by gluing twice, the book polishing working procedure is reduced, and the production efficiency is improved; and the gluing device integrates functions of book arrangement, gluing and covering, simplifies the structure, lowers the cost, is simple to operate, and is wide in application range.

The invention discloses a method for machining a special-shaped powder metallurgy precision die, which comprises the following steps: (1) manufacturing a rough blank, namely cutting the rough blank on a material blank according to the required dimension by using a linear cutting machine; (2) roughly turning appearance, namely roughly turning the appearance by using a special alloy machining cutter; (3) grinding a base, namely flatly grinding the bottom surface till the appearance of the flatly ground base reaches the specified dimension; (4) grinding with a tool, namely machining each angle plane and each arc position on a surface grinder respectively by using a divisible and adjustable rotary center tool, and finally accurately grinding the angle plane and the arc position to the specified dimensions with finish of below Ra 0.2; and (5) polishing the appearance and the molded position till the finish reaches below Ra 0.1. The method has the advantages that: 1, the method has low requirement on equipment, only adopts a tool grinder and does not need to adopt imported high-end equipment; 2, the machining efficiency is improved by 5 times; 3, the cost of auxiliary materials is saved, a red copper or copper-tungsten alloy electrode material is not needed, and only the grinding materials such as a grinding wheel and the like are needed; and 4, the grinding process is reduced, and the grinding precision can reach + / - 0.005.

The invention discloses a grinding process of a vibration reducer piston rod. The grinding process comprises the steps of: (1) performing the first rough grinding form a molded piston rod rough blank; (2) quenching the piston rod after the first rough grinding; (3) straightening the quenched piston rod; (4) performing the second rough grinding for the straightened piston rod; (5) performing the finish turning for the piston rod after the second rough grinding; (6) performing the semi-finish grinding for the piston rod after the finish turning; (7) polishing the piston rod after the semi-finish grinding; (8) electroplating the polished piston rod; (9) performing the ultra-finish grinding for the electroplated piston rod; and (10) performing the UB grinding wheel polishing for the piston rod after the ultra-finish grinding. The grinding process can largely improve the surface quality of the vibration reducer piston rod, can prolong the service life of the piston rod, and can improve the use precision of a vibration reducer.

The invention discloses an assembling fixture without a corner bracket. The assembling fixture without the corner bracket comprises a first vertical support, a transverse support and a second vertical support. The two vertical supports are perpendicularly arranged at the two ends of the transverse support respectively and located on the same side of the transverse support. An electric sucker is arranged at the end, away from the transverse support, of the first vertical support, a first screw rod sleeve seat is arranged on the transverse support, and a first screw rod is screwed on the first screw rod sleeve seat through a thread, moves in the vertical direction and comprises a first abutting end and a first screwing end. The second vertical support is provided with a second screw rod sleeve seat, a second screw rod is screwed on the second screw rod sleeve seat through a thread, moves in the horizontal direction and comprises a second abutting end and a second screwing end, and the first abutting end and the second abutting end are both located between the first vertical support and the second vertical support. Compared with the prior art, the assembling fixture without the corner bracket is simple in structure and high in universality, it can be avoided that craters are left on the surface of a steel plate or profile steel, the disassembling and polishing procedures in a later stage are omitted, the production efficiency is improved, and the manufacturing cost is reduced.

The invention belongs to the field of nanotechnology application, and in particular relates to an antimicrobial stock solution prepared from micro nano particles consisting of nano silver single substance and added in an antibacterial paint, a preparation method thereof and application thereof in the paint. The preparation method comprises that: firstly, nano pure silver colloid, pure water, alcohol solvent, an coating agent, a dispersant and the like are prepared into nano silver mother solution; then, the nano silver mother solution is mixed with solvent, a stabilizing agent and the dispersant to prepare the antimicrobial stock solution for the nano-silver antibacterial paint; and finally, the antimicrobial stock solution for the nano-silver antibacterial paint is added into a water paint or an oil paint required to be used. The invention can provide the antimicrobial stock solution prepared from nano silver single substance; the antimicrobial stock solution uses liquid nano silver stock solution to replace the common powder antimicrobial, solves the problems of small dosage, difficult dissolution and dispersion and easy glomeration, is applied to the paint and can be widely applied to various oil and non-oil (namely solvent and non solvent) paints.

The invention provides a robot welding clamp for a pollution cleaning device. The robot welding clamp for the pollution cleaning device comprises a base, and a first workpiece supporting clamping mechanism, a second workpiece clamping centering mechanism, a third workpiece clamping centering mechanism, a fourth workpiece supporting clamping mechanism and a fifth workpiece supporting clamping mechanism which are all arranged on the base. According to the robot welding clamp for the pollution cleaning device provided by the invention, a cylindrical can body, a head tank cover body, a tail tank cover body, a left flange and a right flange (respectively a first workpiece, a second workpiece, a third workpiece, a fourth workpiece and a fifth workpiece) of the pollution cleaning device are positioned and clamped simultaneously; pipe bodies are spliced in a hand shaking manner; the positioning precision of the tank body is ensured; automatic welding operation of a robot is assisted; the operation is convenient and quick; the structure is novel; the positioning is precise; the clamping is firm and stable; therefore, the welding quality is improved, grinding processes are reduced, the enterprise production cost is reduced, and the product quality is improved.

The invention relates to modified unsaturated polyester resin and in particular relates to polishing-free highlight coating resin. The polishing-free highlight coating resin is characterized in that at least one air-dried monomer is introduced into unsaturated polyester and at least two photoinitiators, namely surface layer initiator photo-curing resin and deep layer initiator photo-curing resin respectively, are adopted. According to the polishing-free highlight coating resin, the air-dried monomer is introduced into the unsaturated polyester, multiple photoinitiators are adopted for playing a synergistic effect, and an ingenious formulation design is adopted, so as to obtain a polishing-free highlight coating, so that a polishing process is eliminated, the production efficiency is improved, the usage amount of resin is reduced, and the production cost is saved; furthermore emission of VOC (volatile organic compounds) is reduced while a photocuring process is adopted, thereby being consistent with the policy of building a resource-saving and environmentally-friendly society advocated in China.

The invention provides an apparatus for polishing a surface of a substrate. The entire surface of a substrate, such as a wafer, can be polished, and the outermost part of the surface of the substratecan be polished without using an edge polishing device, so that the polishing process is reduced. The apparatus includes a substrate holder (10) configured to hold a substrate (W) and rotate the substrate (W); and a polishing head (50) configured to rub a polishing tool (61) against a first surface (1) of the substrate (W) to polish the first surface (1). The substrate holder (10) includes a plurality of rollers (11) which can contact a periphery of the substrate (W). The plurality of rollers (11) are rotatable about their respective own axes.

The invention discloses a pretreatment method for thinning glass. The pretreatment method comprises the following steps of: adding nitric acid, ethylene glycol butyl ether, hydrochloric acid and traceHF into sulfuric-acid solution in sequence according to the priority order and preparing pretreatment blended liquid, wherein the nitric acid accounts for 0.55% of the solute mass fraction of the pretreatment blended liquid, the ethylene glycol butyl ether accounts for 0.02% of the solute mass fraction of the pretreatment blended liquid, the hydrochloric acid accounts for 1.35% of the solute massfraction of the pretreatment blended liquid, the hydrofluoric acid accounts for 0.4% of the solute mass fraction of the pretreatment blended liquid; heating the pretreatment blended liquid to 31-33 DEG C, keeping constant temperature, stopping stirring after stirring for 30 minutes; putting a glass substrate without being thinned into the pretreatment blended liquid for thinning, wherein the thinning speed is 0.015-0.018mu m / s and the thinning thickness is less than 45mu m. The pretreatment method disclosed by the invention has the advantages that the bad phenomena such as pits and scratcheson the surface of the glass substrate are repaired and suppressed, so that the good-product rate in the following thinning procedure is increased, the grinding procedure is saved, the production efficiency is improved, the cost is effectively saved and simultaneously the product quality is improved.

The invention discloses a paint archaized coating process for furniture. The paint archaized coating process is characterized by comprising the following steps of: polishing a white blank, namely polishing the surface of the furniture, so that the surface is smooth; spraying an archaizing agent, namely spraying the archaizing agent on the surface and then drying; spraying primer, namely uniformly spraying the primer after the archaizing agent is dried; and trimming and polishing, namely polishing the surface of the paint, so that the surface is smooth. Compared with the traditional process, the process has the advantages that procedures of applying oil stain, coating a first layer of primer, performing secondary polishing and coating glaze are eliminated, so that the production procedures are simplified, using materials are reduced, the production cost is saved, the paint coating time is shortened, and the production efficiency is improved; and the primary polishing process is eliminated, so that dust generated during polishing is reduced, and the environmental pollution is reduced.

The invention relates to metal cutting gas. The metal cutting gas is prepared from natural gas and additives, and the additives are prepared from p-xylene, ethylbenzene, m-xylene and ferrocene. The cutting temperature of the natural gas metal cutting gas is higher than or equal to that of traditional acetylene gas, cutting quality is good, the source is wide, the preparation cost is low, and using is quite safe.

The invention discloses a simplified method for pretreatment-acid leaching of a neodymium iron boron waste material, the waste material is pulverized by automatically triggered alloy expand and burst in the waste material under the condition of hydrogenation of the neodymium iron boron waste material by use of hydrogen absorption and hydrogen decrepitation characteristics of neodymium iron boron intermetallic compounds; then the waste material is supplied with oxygen for roasting under the condition of complete no dehydrogenation and incomplete dehydrogenation, the waste material is further broken into fine powder, and by common effects of other many favorable factors, Fe element in the waste material can be fully transformed very simply into ferric iron. Based on the pretreatment process, on the one hand, acid leaching optimal solution selectivity can be significantly improved, on the other hand, due to a high degree of pulverization of the waste material, a large number of micro cracks exist in the alloy, and the acid leaching time can be greatly shortened. The method has simple technological process, mild process conditions, high resource and energy efficiency, clean production properties, and other characteristics.

The invention discloses a heating quenching inductor with different heat distributions, and the heating quenching inductor is used for carrying out quenching treatment on a web type gear which is uniformly provided with weight-reducing holes. The heating quenching inductor comprises a ring-shaped effective heating ring and an insulating supporting frame, wherein the outer side wall of the ring-shaped effective heating ring is provided with a plurality of quenching water tubes; the inner side wall of the ring-shaped effective heating ring is uniformly distributed with a plurality of a water outlet fine holes; the upper end of the insulating supporting frame is provided with a cavity which is matched with the web type gear; the outer side wall of the ring-shaped effective heating ring is uniformly embedded with a plurality of magnetizers; and the magnetizers and the weight-reducing holes are arranged in a staggered mode. According to the heating quenching inductor, heat, generated by a peripheral part, close to the weight-reducing holes, of the gear is lower than heat generated by the peripheral part, far from the weight-reducing holes, of the gear, so that thermal deformation caused by induction heating and surface quenching is greatly reduced, and a follow-up milling process is omitted, and therefore, the gear production efficiency is improved and the gear manufacturing cost is reduced.

The invention discloses a preparation method of a high-ferrosilicon tailing autoclaved brick. The preparation method comprises the following steps: firstly, performing high-ferrosilicon tailing powder preparation, A, slowly adding 20-70% sulfuric acid into untreated iron tailings until the iron tailings are completely soaked into the sulfuric acid, and standing for 1-5 days; B, slowly stirring a sample, filtering the sample by using a funnel, adding water, filtering until no sulfuric acid is attached, taking out the sample, and drying to obtain high-ferrosilicon tailing powder, wherein the filtrate can be prepared into iron sulfate by using a common method; secondly, autoclaving by taking the high-ferrosilicon tailing powder as the main raw material to obtain the high-ferrosilicon tailing autoclaved brick.

The invention discloses a light emitting diode epitaxial wafer preparation method and a light emitting diode epitaxial wafer, which belong to the technical field of semiconductors. The method comprises steps: a first un-doped gallium nitride layer grows on a buffer layer which is stacked on a substrate; a colloidal crystal thin film is formed on the first un-doped gallium nitride layer, wherein the colloidal crystal thin film comprises multiple organic particles arranged in an array; an oxide thin film is deposited on the multiple organic particles and between the multiple organic particles; the multiple organic particles are heated, the multiple organic particles are decomposed to a gas during a temperature rise process and the gas is exhausted from between the oxide thin film and the first un-doped gallium nitride layer, and multiple cavities which are arranged in an array are formed between the first un-doped gallium nitride layer and the oxide thin film; a second un-doped gallium nitride layer grows on the oxide thin film; and an N-type gallium nitride layer, multiple quantum well layers, an electron barrier layer and a P-type gallium nitride layer grow on the second un-doped gallium nitride layer sequentially, and an epitaxial wafer is formed. Thus, the epitaxial wafer consistency is improved.

The invention discloses a method for improving the surface quality of a sulfuric acid dew point corrosion resistant steel plate, the method comprises heating, rolling and cooling processes; in the heating process, a refractory coating is sprayed on the surface of a plate blank before the plate blank enters a heating furnace; the temperature of the plate blank is controlled at 980 to 1180 DEG C when the plate blank is discharged from the heating furnace. The method adopts the surface treatment technology before the plate blank is put into the heating furnace to improve the descaling effect, andeffectively reduces the selective oxidation of Cu and Fe elements on the surface of the plate blank during the heating process of the sulfuric acid dew point corrosion resistant steel plate; the lowtemperature heating technology improves formation of a liquid Cu-rich phase on the surface of the steel plate and penetration of the liquid Cu-rich phase along austenite grain boundary, and the methodhas the advantages of preventing the occurrence of cracks on the surface of the steel plate, reducing the surface grinding process of the steel plate, improving the finished product rate, and effectively improving the surface quality of the steel plate. The method can effectively improve the surface crack defect of the sulfuric acid dew point corrosion resistant steel plate and improve the surface quality of the steel plate without adding of a relatively-expensive Ni element to the steel plate component, and the sulfuric acid dew point corrosion resistant steel plate has the characteristics of good surface quality, low cost and simple process and the like.

The invention discloses a machining method of an aircraft large arc-shaped structural part and a T-shaped staggered tooth cutter for machining. Firstly, the hard alloy T-shaped staggered tooth cutteris used to machine the part; and the hard alloy T-shaped staggered tooth cutter is designed personally and staggered teeth of a cutting edge of the hard alloy T-shaped staggered tooth cutter are correspondingly arranged on an upper plane and a lower plane of a cutter body. Through the machining method comprising the steps of forged piece preparation, inspection, part rough machining, heat treatment, part finish machining and inspection, the machined part is good in surface quality, the part yield is high, the working efficiency of part machining is high, a bench worker grinding process is reduced, the probability that the part is affected by human factors is reduced and the delivery cycle is shortened.

The invention belongs to the technical field of nuclear fuel preparation, and relates to a preparation method of a honeycomb fuel pellet. The preparation method which does not include a grinding stepsequentially comprises the following steps: (1) granulating: weighing raw material powder particles, filling a mold with the raw material powder particles, pre-pressing the raw material powder particles in a hydraulic machine, crushing a pre-pressed green body, sieving the crushed green body to obtain large particles, mixing the large particles with a binder, pouring the obtained mixture into a ball mill jar, placing grinding balls in the jar, and performing high-energy ball milling; (2) pressing: sieving the obtained ball-milled powder, filling the mold with the large particles, pressing thelarge particles, and demolding the pressed large particles to obtain a pellet pressed body; and (3) sintering: dewaxing the pellet pressed body, placing the dewaxed pellet pressed body in a burning boat, and placing and sintering the burning boat in a sintering furnace to obtain the finished honeycomb fuel pellet. The preparation method of the honeycomb fuel pellet of the invention has the advantages of realization of the production of the nuclear fuel pellet with a complicated shape by using the existing nuclear fuel production line, omission of the grinding process, increase of the production efficiency and reduction of the production cost.

The invention discloses a motion control method for later-cutting rounded glass. The motion control method comprises the following steps: performing Y-axis motion to cut in linear cutting; when the linear cutting enters arc cutting, performing X-axis, Y-axis and C-axis linked motion to keep the position of a cutting point unchanged; in arc cutting, leading the X-axis, Y-axis and C-axis motion to be simultaneous to complete arc cutting; when the arc cutting enters the linear cutting, performing X-axis, Y-axis and C-axis linked motion to keep the position of a cutting point and the speed unchanged; and then entering linear cutting again, and leading the Y axis to move for cutting. According to the motion control method for later-cutting rounded glass, the precision of linear and arc transition and an arc cutting part can be enhanced, and the subsequent polishing procedure can be omitted.

The invention provides a sintering method for a powder metallurgy brake pad. The sintering method comprises the steps that at least one high-temperature-resistant tray is provided, at least one cavityis formed in each high-temperature-resistant tray, a bottom face and an avoiding structure are arranged in each cavity, and the avoiding structures contain protruding structures and cylindrical coreson avoiding back plates; the high-temperature-resistant trays are installed in a sintering furnace in a reducing gas atmosphere; the brake pad obtained after cold press molding is placed in the cavities; at least one pressing plate is provided; the pressing plates are placed in the cavities above friction blocks; pressure acts on the pressing plates so that the pressing plates can press the friction blocks, and the pressure is maintained within a set temperature range; and the high-temperature-resistant trays and the brake pad are slowly cooled together, and then the brake pad is taken out ofthe high-temperature-resistant trays. According to the sintering method for the powder metallurgy brake pad, the product performance and quality are effectively improved, and the product consistencyand reliability are guaranteed.

The invention relates to the technical field of automatic equipment, and provides an automatic steel bar machining system. Automatic steel bar machining is achieved through a cutting module, a rib peeling chamfering module and a thread rolling module, the labor cost can be saved, and the production efficiency is improved, wherein the cutting module, the rib peeling chamfering module and the threadrolling module are sequentially arranged. The machining modules are arranged in a modular combination manner. Through the arrangement of procedures of saw cutting, rib peeling chamfering and thread rolling, the technical problem that in the prior art, a flat end face formed after saw cutting deforms after rib peeling and thread chaing, and rubbing-down needs to be conducted again is solved, the grinding procedure is omitted, technology arrangement is more reasonable and simpler, the problem about the large occupied area is solved, and energy saving and consumable reduction are facilitated. Rib peeling chamfering machining and thread rolling machining are divided into two procedures, the problem that in the prior art, the machining duration of rib peeling and thread rolling machining and grinding machining is not matched with the saw cutting machining duration beat is solved, technology arrangement and the production beat are more reasonable, and the production efficiency can be betterimproved.

The invention discloses an automatic line sander. The automatic line sander comprises a rack, a feeding driving unit and a polishing head system. The rack comprises an adjustable lifting mechanism, afeeding table lifting operation mechanism and a polishing head installation frame, the polishing head installation frame is fixed to the adjustable lifting mechanism through a bolt, the feeding driving unit is installed on the rack, the polishing head system is installed on the polishing head installation frame in the rack and comprises five polishing head mechanisms, the five polishing head mechanisms comprise the two horizontal polishing head mechanisms, the one perpendicular polishing head mechanism and the two oblique polishing head mechanisms which polish a line from five different anglescorrespondingly, and the angles are adjustable. The automatic line sander has the advantages that (1) the manual line coping procedure is omitted, and the labor cost is saved; (2) the efficiency is high, and after shape milling is conducted, one-time forming is achieved through polishing; (3) polishing is even, and the sanding quality is good; and (4) the installation space is saved.

The invention discloses a nanometer calcium carbonate-polyvinyl chloride composite resin preparation method, wherein a liquid-phase blending method is adopted to mix a polyvinyl chloride slurry and a nanometer calcium carbonate emulsion in a slurry tank, and dewatering drying is performed to obtain the nanometer calcium carbonate-polyvinyl chloride composite resin. According to the method of the present invention, the characteristics of lipophilicity of the modified nanometer calcium carbonate, no pore residue on the skin and in the internal of the desorbed polyvinyl chloride, and the like are utilized, and the nanometer calcium carbonate and the polyvinyl chloride resin particles form the uniformly-dispersed stable composite resin through the organic terminal molecule chain winding and the physical adsorption, such that the negative influence of the processing aid during the plastic product production on the dispersion and molecule chain winding effect between the nanometer calcium carbonate and the polyvinyl chloride molecules is avoided, and the mechanical properties of the polyvinyl chloride materials are improved; compared with the in-situ polymerization method and the melt blending method, the method of the preparation method has advantages of simple operation, no solid dust pollution, cleaning and the like; and the drying and grinding step in the nanometer calcium carbonate production can be eliminated so as to substantially reduce the equipment cost and the production cost.

The invention discloses a dart edge-free technique for pouring and casting a film-coated sand shell mold, which comprises the following steps: filling a Y-shaped sprue cup (11) with paint, and passing the paint through the Y-shaped sprue cup (11) and the runner ( 12) Flow into the mold cavity (13), reverse the mold cavity (13) by 180°, and the paint flows out from the triangular cavity (1301) and drain hole (1302) of the sprue cup (11); drying, pouring 1600 ° molten steel is filled with Y-shaped sprue cup (11) and runner (12) and flows into the mold cavity (13) for forming; after that, the model (casting) is polished and shaped. The coated sand shell mold casting process improves the surface quality of castings, which can be higher than the surface smoothness of water glass precision casting, reduces the grinding process, and can obtain coated sand shell mold castings with good smoothness, high yield and high added value.