323results about How to "Reduce grinding" patented technology

The invention provides a medical high-strength titanium alloy wire and a preparation method thereof and relates to component control of a Ti-6Al-4V titanium alloy wire having high strength and good cold molding characteristic and a preparation method thereof. The component control of the Ti-6Al-4V titanium alloy wire is as follows: based on weight percent, 6.0%-6.3% of main element Al, 4.2%-4.5% of V, 0.13-0.15% of interstitial element O and 0.08%-0.12% of Fe. The alloy obtained according to the component control is subjected to smelting, cogging and forging, multiple heating numbers of upsetting and forging, large-deformation rolling, temperature-control hot drawing, stress relief annealing, electric heating straightening and grinding processes so as to prepare the high-strength titanium alloy wire. The Ti-6Al-4V titanium alloy can obtain high strength (tensile strength of more than or equal to 1200Mpa and elongation A of more than or equal to 8%) and excellent plasticity, and can be applied to a medical Kirschner wire fixing system.

The invention discloses a beneficiation method for producing high-quality iron ore concentrate by low-grade magnetic iron ore, which comprises the following steps that a stage grinding-stage magnetic separation discarding tailing beneficiation process is adopted to produce magnetic separation ore concentrate with the iron ore concentrate grade TFe of 62-66%; a positive ion collector reverse flotation process is adopted on the magnetic separation ore concentrate to obtain positive ion collector reverse flotation iron ore concentrate and middling; a negative ion collector reverse flotation process is adopted on the middling obtained by positive ion collector reverse flotation to obtain negative ion collector reverse flotation iron ore concentrate; and the positive ion collector reverse flotation iron ore concentrate and the negative ion collector reverse flotation iron ore concentrate are combined to obtain the ultimate high-quality iron ore concentrate. The invention has the advantages of high grade of iron ore concentrate, high iron recovery rate, small loss of fine iron minerals, low beneficiation energy consumption and small consumption of medicaments, can relieve the industry difficulty of difficult filtration caused by adding starch into fine concentrate, greatly optimizes concentrate filtration operation, can be used for the sorting of magnetite ore, and can also be used for the sorting of weakly magnetic iron minerals such as hematite and the like.

The invention discloses a composite cement grinding aid and its preparation method. According to a formula, the composite cement grinding aid comprises: a grinding agent, a reinforcing agent, a surfactant, molasses, N, N-bis(2-hydroxyethyl)isopropanolamine and water. The composite cement grinding aid can enhance the fluidity of materials during grinding, effectively reduce overgrinding phenomenon of a mill, improve adhesion of the materials to a grinding body, a lining board, and a bin partition board as well as the self agglomeration phenomenon of the materials, thus increasing the machine-hour yield of the cement grinding mill by l0%-20%, enhancing the cement specific surface area to 20-40m<2>/Kg, reducing the sieve residue, optimizing cement particle gradation, promoting cement clinker hydration, and improving the cement mixture activity. The 3-day compressive strength is increased by 3-5MPa, and the 28-day compressive strength is increased by 4-8MPa. The clinker consumption is reduced by 6-10%. The cement production cost is effectively reduced, the cement security is improved, and the adaptability of cement and concrete admixtures are improved.

The invention discloses a silicon carbide wafer bevel grinding, milling and polishing machine and an operation method thereof. The silicon carbide wafer bevel grinding, milling and polishing machine comprises a supporting sheet (1), a rotating shaft (2), a driving motor (3), a motor bracket (4), a vertical rotating arm (5), a horizontal rotating arm (6), a slide frame (7) and a screw rod (9) which are sequentially connected, wherein the lower end of the screw rod (9) is sequentially connected with a first cone gear (12), a second cone gear (13), an adjusting shaft (14) and a rotating wheel (15); a machining tool (19) of a silicon carbide wafer is arranged below the supporting sheet (1). The silicon carbide wafer bevel grinding, milling and polishing machine is reasonable in structural design, convenient to operate and high in working efficiency, bevel grinding, milling and polishing integrated machining can be performed on the silicon carbide wafer, the working efficiency is high, the roughness of a polished bevel can be smaller than 0.1 micron, the machining precision is high, and the applicability is high. The operation method can be applied to the bevel grinding, milling and polishing integrated machining on the silicon carbide wafer which is round or not round.

The invention relates to a method for configuring the shape of a supporting roll of a four-high mill and the shape of a working roll thereof, belonging to the technical field of steel rolling. According to three types of width specifications of band steel which are most rolled by hot-rolling band steel production line, sixth-power polynomial supporting roll shape technology and second-power working roll shape curve are used for configuration so as to lead the contact length of the supporting roll and the working roll and the width of the rolled band steel to be fit. The method has the advantages of eliminating hazardous contact areas in which the parts of the two ends of the supporting roll with the flat roll shape and the working roll expand out of the edge of the band steel to generate large deflection and deformation, solving the problems that the stress concentration of the edges of the supporting roll and the working roll in a hot continuous mill for wide band steel causes stripping and the mill roll with the flat roll shape has large wearing capacity and is not even, reducing the consumption of the mill rill, saving energy, reducing consumption and reducing cost for rolling steel; and by the technical configuration of R2 working roll shape and the supporting roll shape, the invention solves the plate-shape problems that the middle blank generates negative convexity and the wedge shape is large, and improves the control precision of the shape of hot-rolled band steel.

The present invention provides a method and device for detecting the most suitable tooth matching angle of a gear by performing all tooth detection and its signal processing in a short time, thereby canceling the cumulative pitch errors of the left and right tooth surfaces, preventing cutting resides left on the left and right tooth surfaces, and reducing the cutting allowances of the left and right tooth surfaces to irreducible minimum values.According to the left tooth surface (28) which is most considered to leave cutting residue and having a maximum cumulative pitch error AL max (when the clockwise direction is a plus direction) and the right tooth surface(29) having a minimum cumulative error AR min (when the clockwise direction is a plus direction), these cumulative pitch errors are canceled. A correction value d for reducing the cumulative pitch errors after cutting is determined, a reference tooth groove angle 0 is corrected with the correction value d, and thus the tooth matching angle of a work gear(14) is determined.

The invention discloses a preparation method of a silica shear thickening liquid. The preparation method comprises the following steps of: preparing monodisperse silica microspheres with certain grain size in an alcohol-water mixed liquid according to a multi-level seed growth method by utilizing tetraethoxysilane serves as a raw material and ammonia as a catalyst; after reaction is finished, adding shear thickening liquid dispersion media (polyethylene glycol, glycerol and the like) into a SiO2 suspension liquid; after mixing uniformly, removing ethanol, water and ammonia from the mixed liquid by adopting a heating and pressure-reducing method to finally prepare the silica shear thickening liquid, wherein the ethanol which is collected under reduced pressure can serve as a solvent and can be reused. In the preparation method, the SiO2 microspheres exist in the form of a uniformly dispersed suspension liquid from the synthesis link to the preparation link of the shear thickening liquid, so the agglomeration phenomenon of powder in drying and redispersion processes is avoided, and the stability and rheological property of the shear thickening liquid are improved.

The invention discloses a weathering type ilmenite beneficiation treatment method. The beneficiation treatment method comprises the following steps that A prescreening is carried out; B, low intensitymagnetic separation is carried out; C, high intensity magnetic separation is carried out; D, preliminary classification is carried out; and E, flotation is carried out. According to the weathering type ilmenite beneficiation treatment method, the titanium recovery rate is effectively improved, titanium concentrate and iron ore concentrate are obtained at the same time, the technology is simple, the technological process is easily operated, and popularization is facilitated. Beneficiation according to the technical scheme is adopted, the particle size of monomer separation fine-fraction ilmenite in raw ore is protected, and excessive abrasion is avoided; the high intensity magnetic separation technology is used for discarding tailings, the follow-up handling quantity is greatly reduced, and the ore grinding cost and the beneficiation cost are reduced; and an environment-friendly collecting agent KM221 which is good in selectivity, low in cost, non-poisonous and harmless is adopted forflotation recovering of ilmenite ore, fine fraction titanium resources which are difficult to recover through the traditional technological process are effectively recovered, and the weathering type ilmenite resource using rate is improved.

A rack machining comprises drilling on the blank, cutting slot along the tangential line of the hole, milling the gear slot to form the rack, with less grinding effort and machining time with improved machining efficiency. The rack machining equipment comprises a machine base, working bench along the X axis in action, vertical post along Y axis, beam fixed with the post, No.2 milling device on the said beam along the Z axis in motion, with the second milling device composed No.2 generator, rotor shaft of the No.2 generator connected with No.2 gear box in motion, No.2 milling tool wit same output shaft and connected with the No.2 gear box, with the axle line of the output shaft of the No.2 gear box having a inclination angle of 20 degree with the said working bench.

The invention relates to a method for preparing a large-size low-water-peak prefabricated rod, which comprises the following steps of: 1, depositing a core layer and partial cladding material in a quartz glass lining tube by using an in-tube chemical vapor deposition method to meet the requirement of a waveguide structure and optimize fluorine doped components, wherein the F-doped refractive index contribution of an inner cladding layer prepared by an in-tube method is not more than -0.10 percent and the F-doped refractive index contribution of the core layer is not more than -0.03 percent; 2, melting and shrinking the quartz glass lining tube deposited with the core layer and the partial cladding material at the temperature of between 1,900 and 2,300DEG C into a solid core rod, and manufacturing a core rod of which the b/a is more than or equal to 1.5 and less than or equal to 3.0 and the c/a is more than or equal to 2.3 and less than 4.5; 3, cladding a proper amount of uniform quartz loose body on the outer surface of the core rod directly by using an outside vapor deposition method to obtain a loose body prefabricated rod; and 4, slowly heating the loose body prefabricated rod at high temperature for dehydration, and sintering to obtain the transparent large-size low-water-peak prefabricated rod. The advantage of doping of the in-tube method and the advantage of large size of the outside method are combined, the process is simple, and the method is suitable for producing large-size low-water-peak prefabricated rods at low cost on a large scale.

The invention relates to a consolidation grinding material wire-electrode cutting method and dedicated cutting fluid. The existing consolidation grinding material wire-electrode cutting is bad in cutting surface quality, possesses a plurality of deep check lines and tiny damage and is high in surface roughness, and meanwhile, swarf and dropped grinding material grains are easily adhered between the cutting line surface and grinding material grains to lower cutting force of cutting lines. The invention provides the novel consolidation grinding material cutting method and the dedicated cutting fluid used for the consolidation grinding material cutting method. Due to the development of the cutting fluid formula, the consolidation grinding material wire-electrode cutting method and the dedicated cutting fluid used for the consolidation grinding material cutting method overcome the technical limits, obviously improve check lines and tiny damage of the cutting surface, reduce roughness, reduce phenomenon of swarf attachment, improve cutting efficiency, reduce surface modification processing requirements such as grinding, polishing and the like of the cutting surface after cut and reduce cutting cost and follow-up process cost.

The invention discloses method and equipment for eliminating iron scraps from raw materials. The equipment comprises a rack, a charging bucket and a group of magnetic rods, and is characterized in that rotary arms are arranged on the rack and can horizontally rotate around the rack; a lifting mechanism is arranged on each of the rotary arms; rotary mechanisms are connected to the bottoms of the lifting mechanisms; a group of iron barrels are connected to the lower parts of each of the rotary mechanisms; a connection plate, a vibrator and an iron barrel connected with the connection plate are arranged in the group of iron barrels; the group of iron barrels is driven by the lifting mechanisms to sleeve iron barrels on the magnetic rods in the group of the magnetic rods; a motor, a rotary disc and a spring are arranged in each of the rotary mechanisms; each of the rotary disc is connected with each of the motors; a spring is fixed between each of the connection plates and each of the rotary discs; and vibrators are arranged on the connection plates. The method and the equipment have the beneficial effects that the iron barrels and the magnetic rods rotate in the charging bucket when irons are attracted, so that the contact probability of the iron barrels and slurries is increased, and the iron-attraction effect is improved; and when the iron barrels are subjected to iron removal, another group of iron barrels are quickly sleeved on the magnetic rods to perform the next round of iron attraction, so that the iron removal time is shortened, and the efficiency is improved.

The invention discloses a total temporomandibular joint prosthesis. The total temporomandibular joint prosthesis comprises a mandible prosthesis, a condyloid process head prosthesis, a glenoid fossa bottom prosthesis and a glenoid fossa fossa prosthesis; the mandible prosthesis comprises a head part, a neck part and a lifting and supporting fixing part; the condyloid process head prosthesis is of a hollow ball body, and the hollow part is in a shape of a circular platform in match with the head part of the mandible prosthesis, and thus the head part of the mandible prosthesis is perfectly connected with the condyloid process head prosthesis; the glenoid fossa bottom prosthesis comprises a zygomatic arch fixing part and a connecting part; the glenoid fossa fossa prosthesis is cuboid, and clamping strips are arranged at the left side edge and the right side edge of the glenoid fossa fossa prosthesis; the clamping strips are connected with clamping slots in the fossa surface at a connecting part of the glenoid fossa bottom prosthesis by an inserting and drawing manner; the bottom surface of the glenoid fossa fossa prosthesis is a circular concave surface and is clung to the condyloid process head prosthesis. With the adoption of the total temporomandibular joint prosthesis, the postoperative wound can be reduced; the stability is high; the characteristic that the glenoid fossa of Chinese people is deeper than that of occidental; the articular tubercle is avoided grinding which leads to damage to basis cranii in operation.

The invention discloses a steel mill of a grain mill. The steel mill comprises a movable cutter disc and a fixed cutter disc which are arranged at a predetermined gap, wherein the movable cutter disc and the fixed cutter disc are provided with grinding cutters respectively; the inner ring of the grinding cutter of the movable cutter disc is provided with at least one circle of crushing cutters; the inner ring of the grinding cutter of the fixed cutter disc is provided with at least one circle of crushing cutters; and the outer ring of the grinding cutter on the movable cutter disc is provided with a plurality of centrifugal blades which are arranged annularly.

The invention discloses a mineral processing method for efficiently recovering fine-grained low-grade magnetite. Iron concentrate I and tailings I can be obtained by weak magnetic separation with a magnetic induction intensity of 1100-1300Oe; iron concentrate II and tailings II can be obtained from tailings I by strong magnetic separation with a magnetic induction intensity of 0.9-1T; iron concentrate I and iron Concentrate II is combined and ground to -0.045mm, accounting for 75-85% to obtain fine-grained ore II; fine-grained ore II is subjected to weak magnetic separation with a magnetic induction intensity of 1000-1200Oe to obtain iron concentrate III and tailings III; Iron concentrate IV and tailings IV are obtained by strong magnetic separation with a magnetic induction intensity of 0.560-0.783T, and iron concentrate III and iron concentrate IV are combined to obtain a total concentrate, and tailings II and tailings IV are combined to throw tailings. The invention has the characteristics of short process flow, less grinding amount, high beneficiation efficiency, iron recovery rate and high concentrate grade.

The invention provides a method for preparing large-size hard alloy, which comprises the following steps of: (S1) preparing several segments of small-size hard alloy blanks by using a compression molding method; (S2) performing first vacuum sintering on each hard alloy blank to obtain a semi-finished hard alloy product; (S3) flat grinding the end face of each semi-finished hard alloy product, and successively butting the end faces; and (S4) performing second vacuum sintering on the several segments of entire butted semi-finished hard alloy products to obtain the finished large-size hard alloy product, wherein the highest temperature of second vacuum sintering is 1400-1420 DEG C, the heating speed in the second vacuum sintering process is 3-7 DEG C/min, and the temperature is maintained for 45-80 min after a liquid phase occurs during the second vacuum sintering process. The invention overcomes the limitation that the large-size hard alloy product can only be produced by isostatic pressing in the prior art. Compared with the isostatic pressing production method, the method provided by the invention has greatly reduced cost and greatly shortened production period, and the grinding amount of the product is small.

The hydraulic generator runner plate grinding apparatus includes one hollow pedestal possessing horizontal top plate with one central hole, one coaxial hollow bottomless upper bracket possessing horizontal top plate with one thrust bearing, one horizontal rotating arm on the thrust bearing and with one vertical shaft stretching into the upper bracket space and one grinding mechanism in the work end, one vertical reducing drive unit with one output shaft penetrating the central hole in the pedestal and stretching into the upper bracket space, and one pair of shaft couplers to connect the rotating arm shaft and the output shaft separately. The grinding process includes the following steps: fixing the runner plate and the grinding plate levelly on the platform, grinding while adding engine oil and W20 emery and in the grinding head linear speed of 2.7-3.5 m/s and grinding head pressure of 0.6-1.0 kg/sq cm, and polishing with polishing disc while adding kerosene and grinding paste.

The invention discloses a diamond particle reinforced metal matrix composite material and a preparation method and application thereof. The preparation method comprises the steps of 1, preparing an interface layer; 2, preparing a metal layer; 3, premolding; and 4, carrying out densification treatment. According to the diamond particle reinforced metal matrix composite material and the preparationmethod and application thereof, the adopted sintering of a two-step solid-phase method combined with the premolding and densification treatment is characterized by complementing for each other, fostering strengths and circumventing weaknesses, so that the the characteristic that the solid-phase sintering method capable of preparing a material with smaller particle size is retained, the size of thematerial prepared in a single batch is larger, the thickness reaches the centimeter level or a higher level, the production efficiency is higher, and the cost is greatly reduced; the prepared material has higher thermal conductivity, adjustable thermal expansion coefficient and better uniformity and reliability, and can be directly cut for processing by an electric spark wire; and meanwhile, thepremolding before the densification treatment can solve the problem that a bag sintered by directly adopting hot isostatic pressing is deformed too much so as to result in too much waste of the material, and the material utilization rate is higher.

An oral appliance for the treatment of sleep disorders, such as obstructive sleep apnea, in a user is presented. The oral appliance may include a mouthpiece configured to receive a user's dentition. The mouthpiece may include an oxygen sensor, a pressure sensor, an airflow sensor, an actigraphy sensor, a noise detector, and at least one stimulator for providing stimulation to a user's tongue in the event of decreased oxygen saturation levels, increased pressure applied to occlusal surfaces of the user's dentition, decreased actual airflow levels and/or increased noise levels. The mouthpiece may be provided with pharmaceutical compound reservoirs that deliver pharmaceutical compounds to the oral mucosa of the user, which compounds treat symptoms of sleep apnea. The mouthpiece may further include a microprocessor that receives data from the oxygen sensor, pressure sensor, airflow sensor, actigraphy sensor and noise detector, and activates the at least one stimulator and/or pharmaceutical compound reservoirs.

The invention discloses an automatic soldering machine which comprises a machine frame, a case arranged on the machine frame, a saw blade automatic positioning mechanism arranged on the case, a saw blade automatic detecting and clamping mechanism matched with the saw blade automatic positioning mechanism, a soldering lug automatic cutoff forming and positioning mechanism connected with the saw blade automatic detecting and clamping mechanism, an alloy knife grain automatic positioning mechanism connected with the soldering lug automatic cutoff forming and positioning mechanism, a soldering mechanism arranged above the soldering lug automatic cutoff forming and positioning mechanism, and a soldering flux tape reel arranged below the soldering lug automatic cutoff forming and positioning mechanism. All the mechanisms are controlled by a touch screen operating system, and the touch screen operating system is connected with a computer. According to the automatic soldering machine, soldering flux pieces can be automatically formed and machined, precision and stability during soldering are guaranteed, soldering efficiency and product quality are improved, and manufacturing cost is reduced.

The invention provides a preparation method for a superfine hard alloy cutter blank with a preformed cutter groove. The preparation method is characterized by comprising the following steps: step 1, performing wet mixing and ball milling on superfine WC, superfine Co, superfine VC and Cr3C2, and then performing uniform mixing to obtain a superfine mixture of which all the components are uniform; step 2, adding an adhesive into a vacuum kneading machine, performing kneading till the superfine mixture and the adhesive are uniformly mixed, pelletizing the superfine mixture doped with the adhesive, heating the pelletized material in an injection molding machine till the pelletized material enters a molten state, injecting the molten material into a mold cavity by an injection molding mode, and dissolving and removing the adhesive in a superfine hard alloy soft blank in water; and step 3, performing sintering at 1340-1420 DEG C in a low-pressure sintering furnace, and performing argon gas pressurization at 1-10 MPa to prepare the superfine hard alloy cutter blank with the preformed cutter groove. When the superfine hard alloy cutter blank with the preformed cutter groove is produced by adopting the preparation method provided by the invention, the grinding amount during cutter production can be greatly reduced, the cutter production efficiency can be greatly improved, and the waste of tungsten resources can be reduced.