40results about How to "Strong grinding force" patented technology

The invention provides a resin grinding wheel and a manufacturing method thereof, which belong to the field of grinding tools and are used for solving the problem of the production of harmful sulfur dioxide by pyrite serving as a lubricating agent existing in the conventional resin grinding wheel. The resin grinding wheel comprises a grinding body and a reinforcing sheet which is arranged inside the grinding body for enhancing the revolving strength of the grinding body, wherein 90-105 parts by mass of corundum is taken as a grinding material the grinding body; 2-8 parts by mass of phenolic aldehyde resin liquid and 6-25 parts by mass of phenolic aldehyde resin powder are taken as bonding agents; and 1-10 parts by mass of cryolite and 1-5 parts by mass of polytetrafluoroethylene powder are taken as fillers. The invention further provides a manufacturing method of the resin grinding wheel. In the grinding wheel, the polytetrafluoroethylene powder instead of pyrite is taken as a lubricating agent, so that sulfur dioxide is not produced and other pollution is avoided in the using process.

The invention provides a compound polishing powder of a polishing optical element, a preparation method and a polishing process, belonging to expendable material used for polishing the optical element, the preparation method and the polishing process of the polishing powder; wherein, the polishing powder comprises 0.5-3 of Cr2O3 powder and 1 of Al2O3 according to the weight proportion; the granularity of the Cr2O3 powder is ranging from 0.05 microns to 0.10 microns and the granularity of the Al2O3 powder is ranging from 0.05 microns and 0.10 microns; the polishing process comprises the steps as follows: 1) installing polishing formworks for the optical element; 2) filling the polishing powder; 3) arranging a lens disc; 4) fixing the lens disc; 5) rubbing and polishing. The polishing formwork comprises 500 of polishing asphalt and 20-200 of Al2O3 according to the weight parts; in the polishing process, the polishing powder and the polishing formwork can be used for polishing the optical element which is made of zinc selenide, with the surface smoothness of more than 20-10.

A high-efficiency diamond bit comprises a base and a tool bit fixedly disposed on the base. The tool bit consists of an inner sharp blank, an outer sharp blank and a wear-resistant hard blank sandwiched between the inner sharp blank and the outer sharp blank, and diamond particles and pre-alloyed powder are sintered after being mixed to form each of the inner sharp blank, the outer sharp blank and the wear-resistant hard blank. The tool bit is a sandwich type structure, namely, the wear-resistant hard blank is sandwiched between the inner sharp blank and the outer sharp blank, and excellent sharpness of the top of the tool bit is improved. In addition, when the tool bit grinds, the hardness of the inner sharp blank and the hardness of the outer sharp blank are lower than the hardness of the wear-resistant hard blank, accordingly, a triangular pointed edge can be constantly formed on the top of the tool bit, an excellent self-sharpening performance and excellent sharpness of the cutting head are constantly kept, and cutting force is high.

The invention provides oily grinding liquid and a preparation method thereof. The oilness grinding liquid is mainly prepared from the following components: diamond micropowder, matrix oil, a surfactant, a wetting dispersant, a suspension concentrate, a lubricant, an antiwear additive and a viscosity modifier. The preparation method comprises the following steps: after performing ultrasonic stirring on the diamond micropowder, the surfactant and the matrix oil for 5-10min, adding the wetting dispersant and the suspension concentrate, and performing ultrasonic stirring for 5-10min; and then adding the lubricant and the antiwear additive, performing ultrasonic stirring for 5-10min, determining viscosity, and stirring for a period of time after adding a viscosity reducer or a thickener according to the actual viscosity to obtain the oily grinding liquid. When being applied to sapphire substrate precision machining, the oily grinding liquid provided by the invention has the outstanding features of high grinding rate, controllable grinding disc temperature and small TTV, can improve the grinding processing efficiency, lowers the processing cost, is small in smell and liable to clean andis green and environmentally friendly.

The invention relates to a grinding tool. The powerful grinding sand disk is characterized by comprising a substrate, a reinforcing ring and a grinding work layer; the middle of the substrate is provided with a through hole; the reinforcing ring is fixed on the through hole of the substrate; the front side of the substrate is provided with the annular grinding work layer; the reinforcing ring is positioned on the inner side of the grinding work layer; and the material of the substrate comprises glass fibre or polyester cotton. The powerful grinding sand disk has the characteristics of high strength, good water resistance and weather fastness, low production cost and strong grinding force and is simple to manufacture.

The invention discloses a production method of the TJ-1 special latex paper. The invention is characterized in that the method is that two working procedures of paper making and inner sizing are completed continuously in a multi-net and multi-cylinder paper machine: the latex is sprayed onto a wet shaped paper sheet by a dedicated sprayer on a circular-net pressure molding machine, and latex penetrates quickly to fill the paper with the latex component; then the surface sizing is conducted inside the paper machine, and a single side of the paper sheet is coated with the even and thin latex to reach the liquid adding performance. The TJ-1 special latex paper produced with the invention is applicable for polishing in the sectors of automobile, plane, shipbuilding, machinery, light industry, leather making, furniture, decoration, and so on.

The invention belongs to the technical field of grinding materials, and provides a nylon grinding block formula. The nylon grinding block formula comprises the raw materials, by weight, 25-35% of epoxy resin, 10-20% of curing agents, 5-10 % of wetting agents, 1.2-1.7% of coupling agents, 3-7% of diamonds, 23-27.5% of silicon carbide, 7-9% of polyamide resin, 4-6% of zinc oxide and 1.5-2.5% of PVC resin sand. A nylon grinding block obtained through the nylon grinding block formula is high in hardness, good in tenacity, strong in grinding force, resistant to abrasion, good in heat resistance and long in service life, the machining cost of the unit area is lowered greatly, machining efficiency is improved, holding force is good, and grinding materials cannot drop easily in work.

The invention discloses special zirconium-aluminium composite ground micro-powder for the optoelectronic industry and a production method for the same. The special zirconium-aluminium composite ground micro-powder for optoelectronic industry is produced from two main raw materials, namely, fused alumina and zirconium silicate, via ball-milling, water-washing, grading, compounding, surface coating, filtering, spray-drying and sieving, wherein the compounding ratios of the contents of the raw materials are as follows: the content of alumina particles is 30-50%, and the content of zirconium silicate particles is 70-50%. The product disclosed by the invention is reasonable in particle shape collocation, wide in particle size distribution, stable in median diameter, high in basic particle size ratio, without large particles and ultrafine particles, excellent in interparticle lubrication property, and especially suitable for grinding and polishing high-tech products in the optoelectronic industry.

The invention discloses a method for preparing a resin grinding wheel. The method comprises the following steps: (1) placing 70-85 parts by weight of white corundum into 10-15 parts by weight of acrylic emulsion to be soaked, evenly mixing 6-8 parts by weight of polytetrafluoroethylene powder, 1-2 parts by weight of boron nitride, 15-20 parts by weight of cryolite and 30-35 parts by weight of phenolic resin powder with the soaked white corundum, and enabling the mixture to pass through 20-25-mesh standard screens to obtain a grinding wheel mixture; (2) taking a glass fiber cloth, coating the two faces of the glass fiber cloth with phenolic resin, then placing the glass fiber cloth into a drying oven, and baking the glass fiber cloth at the temperature of 135-140 DEG C for 15-20min to obtain glass fiber pieces; (3) placing the glass fiber mixture into a forming mold, spreading the glass fiber mixture, completely embedding the glass fiber pieces into the grinding wheel mixture, and conducting compression forming to obtain a grinding wheel green body; (4) placing the grinding wheel green body into a sintering furnace to be sintered; (5) machining the sintered grinding wheel green body on a lathe and a grinding machine to obtain the finished resin grinding wheel. When resin grinding wheel prepared by the method is used, harmful gas caused by oxidation can not emit.

The present invention relates to one kind of abrasive cloth disc for machining metal workpiece, and the abrasive cloth disc consists of one basal body and one abrasive cloth layer. The abrasive cloth layer is adhered by means of adhesive onto the basal body, and the basal body is one integral punched metal member of 0.2-2.0 mm thick sheet and with one central installation hole. The present invention has environment friendship, high integral strength and low cost.

The invention belongs to the technical field of polishing, and particularly discloses a glass polishing disk and a production technology thereof. The glass polishing disk comprises a polishing disk base board, a bonding layer and a polishing layer. The polishing disk base board and the polishing layer are fixedly connected through the bonding layer. The polishing layer comprises, by weight percent, 15% to 55% of abrasive particles, 1% to 6% of heat conductive filler, 1% to 6% of active filler, 55% to 70% of unsaturated polyester resin, 1% to 5% of sodium hydrogen phosphate, 0.5% to 1% of a catalyst, 0.5% to 1% of a promoter, 0.05% to 0.35% of cyclohexanone peroxide, 0.05% to 0.15% of an accelerant, 0.5% to 1% of an initiator, 0.05% to 0.25% of a cleaning agent, 5% to 10% of magnesium sulfate, 3% to 7% of urea and 10% to 15% of ammonium bicarbonate. The glass polishing disk is good in polishing effect, no pollution is generated in the use process, and the production cost is low.

The invention discloses a self-sharpening diamond grinding wheel and a preparation method thereof. The diamond grinding wheel comprises material grinding blocks. Raw materials of the material grinding blocks include a metal bond, MoS2, an SG grinding material, diamond and an additive. The additive accounts for 1%-10% by mass of the raw materials of the material grinding blocks. The additive is prepared from the following raw materials including, by mass, 25%-35% of Bi2O3, 25%-35% of B2O3, 5%-10% of ZnO, 5%-10% of SiO2, 5%-10% of Al2O3, 1%-5% of CaF2, 1%-5% of Na2CO3, 1%-5% of Li2CO3 and 1%-5% of MgCO3. The diamond grinding wheel is high in self-sharpening performance and strength, is exquisite in structure, is uniformly consumed in the grinding process, does not need dressing during using and always maintains good grinding force, and thus the problems of long dressing time and high dressing cost of existing diamond grinding wheels are fundamentally solved.

The invention discloses a diamond grinding fluid. The diamond grinding fluid comprises the following components in parts by mass: 2-10 parts of a grinding material, 1-3 parts of a surfactant, 0.5-2 parts of a suspending agent, 0.1-1 part of a wetting agent, 0-8 parts of a pH value regulator, 1-10 parts of a viscosity regulator and 60-90 parts of matrix oil, wherein the grinding material is a mixture of polycrystalline diamond micro-powder, polycrystalline-like diamond micro-powder and monocrystal diamond micro-powder; the grinding material is subjected to surface modification treatment by adopting alkylphenol polyoxyethylene ether in advance; and the suspending agent is at least one selected from the group consisting of N-methyl pyrrolidone, modified polyurea, methyl pyrrolidine and castor oil derivatives. The diamond grinding fluid is high in grinding efficiency, uniform in grinding material dispersion, good in suspension stability and free of sedimentation and layering after being placed for a long time.

The invention discloses a squeezing device for a micro tea fruit oil mill. The squeezing device comprises a shell; a feed port is formed in the top of the right end of the shell; an oil outlet is formed in the bottom of the left end of the shell; a motor is mounted on the right side of the shell; an output end of the motor is connected with a grinding shaft; the grinding shaft penetrates through the shell, and extends to the left end in the shell; the right end of the surface of the grinding shaft is connected with multiple cake discs; first grinding patterns are arranged on the side surfaces of the cake discs; the left end of the surface of the grinding shaft is connected with a cylindrical grinding cylinder; second grinding patterns are arranged on the surface of the grinding cylinder; and multiple projections, uniformly distributed, are respectively arranged in the contacted points of the inner wall of the shell with the first grinding patterns and the second grinding patterns. The squeezing device can improve the grinding force thereof to increase the tea fruit oil yield, and meanwhile, can effectively prevent the blockage phenomenon thereof to deserve popularization.

The present invention relates to method of preparing a monocrystalline diamond abrasive grain comprising the steps of: sufficiently dispersing a micron-scale monocrystalline diamond and at least a micron-scale metal powder in a sol containing at least a nano-scale metal powder, and controlling the suitable ratio of the two kinds of metal powder with different order of magnitude of particle size, accordingly the micron-scale metal powder can be stuffed into voids among the monocrystalline diamond grains, and only a suitable amount of nano-scale metal powder is required to let the micron-scale metal powder and nano-scale metal powder coat together on the surface of the micron-scale diamond to form an integral and uniform coating layer including at least two kinds of metal grains, thus the resulting monocrystalline diamond abrasive grains have a unique rough-surface morphology, a plurality of contact points and contact surfaces resenting in the grinding process and good self-sharpening.

The invention discloses a self-sharpening resin binder diamond grinding wheel and a preparation method thereof. The formula of the grinding wheel comprises the following components of, in percentage by volume, 15%-65% of foam diamond, 15%-45% of phenolic resin powder, 2%-15% of chromic oxide, 0%-15% of zinc oxide, 2%-10% of graphite, 16%-50% of silicon carbide, 0%-3% of pore forming agent, 0%-3% of a coupling agent, and 0%-5% of a wetting agent. According to the self-sharpening resin binder diamond grinding wheel and the preparation method thereof, compared with an existing grinding wheel, the self-sharpening resin binder diamond grinding wheel prepared through the method is characterized in that the foam diamond, the pore forming agent, the wetting agent and the coupling agent are added, the effective contact area between the foam diamond and the binder is increased, abrasive particles cannot fall off integrally due to the inlaying effect of the foam structure of the foam diamond and the binder, the diamond grinding wheel is even in consumption in the using process, the finishing frequency can be effectively reduced, good grinding force is kept, meanwhile, the self-sharpening performance of a grinding tool is improved, cutting damage is effectively reduced, and the workpiece surface machining quality is improved.

The invention discloses a composite binder grinding wheel for machining a large-size silicon carbide substrate and a preparation method of the composite binder grinding wheel, and particularly relates to a formula and a preparation method of a composite binder superhard-material grinding wheel for machining a silicon carbide semiconductor material. The formula mainly comprises the following components of 25%-45% of diamond abrasives, 25%-40% of pre-alloyed powder, 8%-20% of polyphenylene sulfide, 10%-18% of zinc oxide whiskers and 8%-22% of SG abrasives. According to the preparation method, the polyphenylene sulfide and zinc-copper alloy powder are adopted as a composite binder system, and the binder system is high in abrasive holding force, resists high grinding resistance of large-size silicon carbide and is high in grinding force. The grain structure of an alloy system is refined through iron, aluminum and the like, brittleness is increased, and grinding sharpness of the grinding wheel is improved. Meanwhile, the isotropy of the microstructure of a grinding wheel layer can be improved through utilization of the whiskers and the like, a good homogeneous state is obtained, and the grinding stability problem of the silicon carbide substrate is solved. The machining problem of the large-size silicon carbide substrate is thoroughly solved.

The invention provides a resin grinding wheel and a manufacturing method thereof, which belong to the field of grinding tools and are used for solving the problem of the production of harmful sulfur dioxide by pyrite serving as a lubricating agent existing in the conventional resin grinding wheel. The resin grinding wheel comprises a grinding body and a reinforcing sheet which is arranged inside the grinding body for enhancing the revolving strength of the grinding body, wherein 90-105 parts by mass of corundum is taken as a grinding material the grinding body; 2-8 parts by mass of phenolic aldehyde resin liquid and 6-25 parts by mass of phenolic aldehyde resin powder are taken as bonding agents; and 1-10 parts by mass of cryolite and 1-5 parts by mass of polytetrafluoroethylene powder are taken as fillers. The invention further provides a manufacturing method of the resin grinding wheel. In the grinding wheel, the polytetrafluoroethylene powder instead of pyrite is taken as a lubricating agent, so that sulfur dioxide is not produced and other pollution is avoided in the using process.

The invention relates to a deburring method for the pressure regulating cavity of an oil injector body and the device, which is characterized in adopting grinding medium slurry jet for deburring. The method is as follow: a high pressure generator is used for generating high-speed jet of grinding medium slurry, wherein, the grinding medium particles with greater kinetic energy in the grinding medium slurry jet has strong grinding force; the burr and oxide on the channel inner wall of the pressure regulating cavity of the oil injector body are removed with the eroding and grinding function of the grinding medium particles. The device comprises a generator of high pressure slurry jet, a nozzle reciprocating movement mechanism, a workpiece rotary mechanism and a feed mechanism. The deburring method has the advantages of high processing efficiency and high processing quality together with the device.

The invention discloses a polishing wheel. The polishing wheel comprises the following raw materials including silicon carbide, brown aluminium oxide, industrial salt and resin-oatmeal. The invention further discloses a preparation method for the polishing wheel. The polishing wheel adopts resin binder, grinding materials are formed by choosing and compounding the silicon carbide and the brown aluminium oxide, since the two grinding materials are chosen and mixed, the relationship between the hardness and the toughness of the grinding materials can be adjusted, the polishing wheel has the properties and advantages of the two grinding materials, and therefore the grinding performance of the polishing wheel is improved, and the polishing wheel has the advantages of being high in hardness, good in self-sharpening performance, strong in grinding force and low in heat production amount; meanwhile, the preparation technology adopts the high-temperature pressing technology, the mechanical strength of the polishing wheel is further strengthened, and the grinding efficiency of the polishing wheel to workpieces is obviously improved. According to the production formula method for the polishing wheel, the produced polishing wheel is good in grinding performance, high in mechanical strength and long in service life.

The invention discloses a composite bond grinding wheel for large-scale silicon carbide substrate processing and a preparation method thereof, in particular to a compound bond superhard material grinding wheel formula and a preparation method for silicon carbide semiconductor material processing. The formula mainly consists of the following components: 25-45% diamond abrasive, 25-40% pre-alloyed powder, 8-20% polyphenylene sulfide, 10-18% zinc oxide whisker, and 8-22% SG abrasive. The preparation of the invention adopts polyphenylene sulfide and zinc-copper alloy powder as a composite binder system, and the binder system has strong holding force on abrasives, resists high grinding resistance of large-sized silicon carbide, and has strong grinding force. Iron, aluminum, etc. refine the grain structure of the alloy system, increase the brittleness, and improve the grinding sharpness of the grinding wheel. At the same time, the use of whiskers can increase the isotropy of the microstructure of the grinding wheel layer, obtain a better homogeneous state, and solve the problem of grinding stability of silicon carbide substrates. It completely solves the problem of processing large-size silicon carbide substrates.

The invention discloses an extruding and grinding type soft rock crusher, which belongs to the field of rock crushing equipment. It includes a frame combination plate, a vibrating crushing device A, a vibrating crushing device B, a vibrating crushing device C, a rotary extrusion crushing device A, a rotary extrusion crushing device B and a conical feeding port; Device B and vibrating lithotripsy device C have the same structure as vibrating lithotripsy device A, including metal coil spring A, guide column, metal coil spring B, guide sleeve and vibrating plate; Extrusion crushing device B has the same structure, including a rotating shaft bracket, an extruding rotating shaft, a synchronous gear, a sliding sleeve and a conical extruding plate. The invention is a simple and reasonable structure, adopts two modes of vibration and extrusion grinding to destroy soft rock, and has better crushing efficiency and crushing effect.

The invention discloses a ceramic tile chamfering grinding sheet and a production method thereof, belonging to the field of grinding tools. The binding agent in the grinding sheet at least comprises two components: melamine resin and bismaleimide resin; the grinding sheet It includes the following components by weight percentage: 50-60% of the bonding agent, 10-15% of the diamond abrasive and 20-30% of the filler; the production method includes: step 1, mixing the components uniformly in proportion to obtain Homogeneous mixture; step 2, put the homogeneous mixture into the steel mold and level it, put the nylon hook cloth into the steel mold, and put the indenter; step 3, put the steel mold and the indenter into the hydraulic press for heating and sintering Forming; finally, the tile chamfering polishing sheet is obtained. The beneficial effects of the invention are as follows: the ceramic tile chamfering grinding sheet produced by the formula and production method has the advantages of good wear resistance, good sharpness, good grinding stone effect, convenient replacement and environmental protection of materials.

The invention discloses a production process for high-strength green silicon carbide micropowder and a special grinder for the high-strength green silicon carbide micropowder. The special grinder comprises a horizontal mill body (1), a slurry circulation pump (2), an iron remover (4) and a settling tank (5), wherein the discharge hole of the horizontal mill body (1) is communicated with the feeding hole of the settling tank (5) by virtue of a slurry conveying pipeline A (3), the iron remover (4) is arranged between the slurry conveying pipeline A (3) and the feeding hole of the settling tank (5), the discharge hole of the settling tank (5) is communicated with a feeding hole of the horizontal mill body (1) by virtue of a slurry conveying pipeline B (3'), and a slurry flow control valve (8) is arranged on the slurry conveying pipeline B (3'). According to the production process for high-strength green silicon carbide micropowder and the special grinder disclosed by the invention, the problem of the traditional green silicon carbide micropowder that the strength and the cutting force are influenced as the particle sizes of the traditional green silicon carbide micropowder are different is solved, and the problem of the traditional grinder that in the grinding process, powders in different particle sizes are mixed and ground to cause excessive grinding is also solved.

The invention discloses a method for machining a variable-section nozzle ring blade of a turbocharger. The method includes clamping a blade (1) on a rotary fixture; manufacturing a grinding wheel (2) according to the shape of the blade; acquiring the ratio of the feeding width to the feeding depth of the grinding wheel according to ground quantities of a blade rod (3) and a lower end surface (4) of the blade; enabling the grinding wheel to rotate under the control of a computer and obliquely feeding the grinding wheel according to a ratio angle relative to the blade; grinding and machining the blade rod and the lower end surface of the blade simultaneously and automatically measuring the blade rod and the lower end surface of the blade; and automatically withdrawing the grinding wheel after machining requirements are met until a workpiece is machined. The method has the advantages that the blade rod and the lower end surface of the variable-section nozzle ring blade which originally needs to be machined on a plurality of different machine tools in a plurality of working procedures can be simultaneously machined on a single machine tool in a single working procedure, accordingly, labor, materials and the machining time are saved, and the machining efficiency is improved; and the blade machining precision and the mechanical strength of the blade can be guaranteed, and the machining quality can be improved.

The invention belongs to the technical field of grinding materials, and provides a nylon grinding block formula. The nylon grinding block formula comprises the raw materials, by weight, 25-35% of epoxy resin, 10-20% of curing agents, 5-10 % of wetting agents, 1.2-1.7% of coupling agents, 3-7% of diamonds, 23-27.5% of silicon carbide, 7-9% of polyamide resin, 4-6% of zinc oxide and 1.5-2.5% of PVC resin sand. A nylon grinding block obtained through the nylon grinding block formula is high in hardness, good in tenacity, strong in grinding force, resistant to abrasion, good in heat resistance and long in service life, the machining cost of the unit area is lowered greatly, machining efficiency is improved, holding force is good, and grinding materials cannot drop easily in work.

A high-efficiency diamond bit comprises a base and a tool bit fixedly disposed on the base. The tool bit consists of an inner sharp blank, an outer sharp blank and a wear-resistant hard blank sandwiched between the inner sharp blank and the outer sharp blank, and diamond particles and pre-alloyed powder are sintered after being mixed to form each of the inner sharp blank, the outer sharp blank and the wear-resistant hard blank. The tool bit is a sandwich type structure, namely, the wear-resistant hard blank is sandwiched between the inner sharp blank and the outer sharp blank, and excellent sharpness of the top of the tool bit is improved. In addition, when the tool bit grinds, the hardness of the inner sharp blank and the hardness of the outer sharp blank are lower than the hardness of the wear-resistant hard blank, accordingly, a triangular pointed edge can be constantly formed on the top of the tool bit, an excellent self-sharpening performance and excellent sharpness of the cutting head are constantly kept, and cutting force is high.

The invention provides a water-milling environmental-friendly polishing wheel. The polishing wheel comprises, by weight, 30-40 parts of polyether polyol, 10-20 parts of polyester polyol, 20-60 parts of isocyanate, 0.01-0.05 part of catalyst, 1-5 parts of chain extender, 0.1-1.0 part of foaming agent, 100-300 parts of abrasive material, and 5-15 parts of filler. The hardness range of the water-milling environmental-friendly polishing wheel is 92-98A (Shore hardness), compared with a rubber polishing wheel, the water-milling environmental-friendly polishing wheel has the hardness advantage (high hardness, strong grinding force and high grinding efficiency), and compared with a resin grinding wheel and a magnesia grinding wheel, the water-milling environmental-friendly polishing wheel is high in glossiness and good in structural toughness, and workpieces needing to be polished are not easy to be damaged. Therefore, the water-milling polishing wheel can achieve the effects that the surface of the workpiece has good glossiness and beautiful surface texture modification through one-time polishing treatment.

The invention provides a large-bevel-edge 2.5 D cover plate machining device and method, and relates to the field of glass machining and manufacturing, the large-bevel-edge 2.5 D cover plate machining device comprises a cover plate fixing mechanism, a first grinding wheel rod and a second grinding wheel rod, the first grinding wheel rod is provided with a first cutting edge face, and the first cutting edge face is a first conical face with the large upper portion and the small lower portion; the second grinding wheel rod is provided with a second cutting edge surface and a third cutting edge surface which are consistent in shape, the second cutting edge surface comprises a second conical surface, a third conical surface, a fourth conical surface, a cylindrical surface and a fifth conical surface which are sequentially connected from top to bottom, and the roughness of the first cutting edge surface, the second cutting edge surface and the third cutting edge surface is sequentially reduced. A large bevel edge is machined at a time through the first cutting edge face, a contour is formed at the upper position and the lower position of the large bevel edge at a time through the second cutting edge face, and finally the contour of a rough product is finely trimmed through the third cutting edge face, so that the cover plate is obtained through complete forming, and beveling trimming is not needed. The processing yield and the processing efficiency are higher, and the standard reaching rate of the product size and the processing precision are improved.