73results about How to "Improve grinding force" patented technology

Alpha alumina-based abrasive grain and method of making the same. The abrasive grain can be incorporated into abrasive products such as coated abrasives, bonded abrasives, non-woven abrasives, and abrasive brushes.

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 discloses a binder-free polycrystalline cubic boron nitride abrasive and a preparation method thereof. The preparation method of the abrasive comprises the following steps: 1, adding hexagonal boron nitride powder into a die, and carrying out molding preformation; 2, carrying out cold isostatic pressing treatment on the above preformed product under vacuum conditions; 3, adding the above obtained hexagonal boron nitride block into a tantalum cup in order to form an assembled block together with a pressure transmitting medium; and 4, carrying out high temperature high pressure synthesis treatment on the assembled block, carrying out furnace cooling, demolding, crushing, and grading to prepare the abrasive. The binder-free polycrystalline cubic boron nitride abrasive has the ultrafine crystal structure of submicron dimension cBN monocrystal, and the micro-fragmentation self-sharpening effect and the isotropy of the binder-free polycrystalline cubic boron nitride abrasive overcome passivation, cleavage, anisotropy and other defects of monocrystalline cBN abrasives; and the binder-free polycrystalline cubic boron nitride abrasive disclosed in the invention has high hardness and strength, is suitable for high precision processing of high hardness quenched steel, especially electrical, electronic and optical devices, has very high social values and economic benefit, and is suitable for popularization and application.

The invention relates to a method for producing polishing powder used for a liquid crystal display device. The method comprises the following steps: at the room temperature, 30 to 40 percent of fluorosilicic acid is added into rare earth chloride solution with REO of between 80 and 100 gram/litre and CeO2/REO of more than or equal to 70 percent under the stirring; after five minutes, an additive A is added into the mixture, is heated to the temperature of between 70 and 80 DEG C, is kept at the temperature and is added with mixed precipitant solution till the reaction ends; the PH value of the mixture is 7; the mixture is stirred for 10 minutes, is kept stand for 3 to 5 hours and supernatant fluid of the mixture is removed through siphonage; under the stirring, cold water is added to nearly fill a groove fully; before the stirring is stopped, flocculant solution is added till appearing the flocculating effect; the mixture is kept stand, is deposited and the supernatant fluid of the mixture is removed through siphonage for three times; the mixture is washed, is heated up to 98 DEG C, is kept at the temperature for 10 minutes and is discharged to a stainless steel sieve with 120 meshes; the mixture is subjected to solid-liquid separation, vacuum extraction and filtering and dewatering by a centrifuge; a filter cake is transferred to a quartz material sagger; the charging thickness is less than or equal to 9 centimeters; the filter cake is transported to a muffle tunnel kiln at the temperature of 900 DEG C, is subjected to dehydration in a preheating section and decomposition and transformation at certain degree, is roasted for 3 to 4 hours at high temperature of 900 DEG C, is cooled to the temperature of less than 400 DEG C in a cooling section and comes out from the kiln; a roasted material is cooled to the room temperature and is subjected to stage treatment; and a quality part is the product.

Disclosed is a synthetic grinding stone used for polishing of silicon wafer, which is composed of a structure comprising cerium oxide fine particles as abrasive grain, a resin as a binder, a salt as a filler and a nano diamond as an additive. This synthetic grinding stone is characterized in that the purity of the cerium oxide is not less than 60% by weight, the content of the salt as a filler is not less than 1% but not more than 20%, the volume content of the nano diamond as an additive is not less than 0.1% but less than 20% relative to the total volume of the structure, and the porosity as the volume fraction relative to the total volume of the structure is less than 30%.

The invention belongs to the field of PCB cutting, and discloses a non-woven fabric brush wheel as well as a production system and method thereof. The non-woven fabric brush wheel comprises an axis and a non-woven fabric layer which is wound on the axis and is formed by a plurality of layers of non-woven fabrics. The non-woven fabric brush wheel is characterized in that the non-woven fabric layeris formed by a non-woven fabric wound on the axis after being impregnated. The production system for the non-woven fabric brush wheel comprises a feeding unit for inputting the non-woven fabric, an impregnating unit for impregnating non-woven fabric and a rolling unit for rolling impregnated non-woven fabric into a compact non-woven fabric roll, and the feeding unit, the impregnating unit and therolling unit are sequentially arranged. The invention aims to provide the non-woven fabric brush wheel. The non-woven fabric brush wheel is high in hardness, is uniform in glue content, is good in grinding effect and is long in service life. The invention further discloses the production system and the production method for the non-woven fabric brush wheel.

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 invention discloses an improved dual-support oil wedge-shaped dynamic pressure spindle assembly for a conical roller coreless grinding machine. The dual-support oil wedge-shaped dynamic pressure assembly comprises a spindle, a sand wheel combination and tile sleeve combinations; the sand wheel combination is positioned in the middle of the spindle and comprises a sand wheel chuck, a spindle conical sleeve, a sand wheel chuck end cover and a sand wheel; the sand wheel is fixed on the sand wheel chuck by the spindle, the sand wheel chuck, the spindle conical sleeve and the sand wheel chuck end cover; the tile sleeve combinations are arranged at two ends of the spindle; each tile sleeve combination comprises a tile sleeve, a shaft tile, a tile sleeve end cover, a tile sleeve end cover and an end cover connection disc. Compared with the single-support oil wedge-shaped spindle assembly, the improved dual-support oil wedge-shaped dynamic pressure spindle assembly for the conical roller coreless grinding machine has the advantages of high machining and rotating precision and large grinding force.

The invention relates to a production method of a no-network polyester fabric, which belongs to the field of textile technology and aims to solve the technical problem that complex preparation processes in the prior art require production of network yarns to enhance product strength. The production method includes: A, preparing polyester chips; B, preparing master-batches; C, preparing draw textured yarns, and D, preparing the no-network polyester fabric. The production method is simple in process and requires no processing of network polyester yarns or setting via a second hot box, and the high-strength fabric can be obtained. The fabric produced by the method is high in color fastness.

The invention relates to a positioning assembly for a back support of a mirror of an optical remote sensor, which comprises a substrate; a first fixing component arranged on the substrate and used forfixing the mirror of the optical remote sensor; a bearing component which comprises a bearing piece arranged on the substrate and a second fixing component arranged on the bearing piece; the bearingpiece is used for bearing a contact pad of the mirror of the optical remote sensor, and the second fixing component is used for fixing the contact piece on the bearing piece. According to the invention, the mirror body and the contact pad are relatively fixed through the first fixing component and the bearing component; when grinding is carried out, the grinding force directly acts on the end faceof the contact pad at the back of the main mirror component and is directly transmitted to the substrate through the bearing component, the back support piece does not bear alternating stress so as to avoid fatigue damage, and meanwhile, the grinding force when grinding the end face of the contact pad can be greatly improved so as to improve the grinding efficiency of the coplanarity grinding ofa flexible end face.

The invention discloses an external grinding device for a thin-walled part for a motor. The external grinding device comprises a rack, a clamp, a three-jaw chuck fixed to the rack, a spindle box driving the three-jaw chuck, and a grinding tool. The clamp comprises a mandrel, an expansion bushing, a pressing plate and a gland nut. The mandrel is provided with a threaded section and a conical section. The small-diameter end of the conical section is close to the threaded section. The gland nut is in threaded connection with the threaded section. The expansion bushing is a polyurethane expansion bushing. The inner working surface of the expansion bushing is arranged to be a taper hole. The conicity of the taper hole is matched with that of the conical section of the mandrel. The pressing plate is located between the gland nut and the expansion bushing. The pressing plate is annular. The inner diameter of the pressing plate is smaller than that of the expansion bushing and larger than the large diameter of the threaded section. The outer diameter of the pressing plate is larger than that of the expansion bushing. The grinding tool comprises two bearing rollers fixed to the rack, two counterweights and an abrasive belt. The abrasive belt is located between the expansion bushing and the bearing rollers. The two ends of the abrasive belt are wound around the bearing rollers and connected with the counterweights in a hanging mode. The external grinding device is easy to design and manufacture and capable of being applied to small-lot or single-piece production.

The invention discloses a method for preparing waterborne epoxy resin for manufacturing polishing cloth. The method includes steps of S1, dissolving, by weight, 500-580 parts of epoxy resin in 500-580 parts of mixed organic diluents to obtain solution A; S2, dissolving, by weight, 200-230 parts of diethylenetriamine in 500-580 parts of organic solvents to obtain solution B; S3, dropwise adding the solution A into the solution B to obtain solution C when the solution A is completely dropwise added into the solution B; S4, cooling the solution C until the temperature of the solution C reaches 20 DEG C, dropwise adding, by weight, 470-575 parts of organic acid into the solution C and stirring the solution C and the organic acid for 0.5 hour to obtain the transparent orange waterborne epoxy polyamine resin for manufacturing the polishing cloth. The temperatures of the solution A and the solution B are 40 DEG C when the solution A starts to be dropwise added into the solution B, the dropwise adding speeds are controlled in dropwise adding procedures, and the reaction temperatures are 40-50 DEG C. The method has the advantages that the polishing cloth with phenolic resin can be toughened by the waterborne epoxy resin prepared by the aid of the method; the polishing cloth manufactured by the aid of the method is excellent in tearing and tensile strength, cutting force can be enhanced, and the moisture absorption can be obviously improved.