71results about How to "High material hardness" patented technology

A screw assembly and method includes a coupling member comprising a semi-bulbous end; a fixator component that receives the semi-bulbous end of the coupling member; a resisting member mounted in the coupling member and comprising a mating member; a connection pin comprising a resisting member socket operatively connected to the mating member of the resisting member; and a blocker that engages the coupling member.

The invention discloses a standard test piece based on a calibration permeability test. The standard test piece is in the shape of a solid cylinder and composed of a solid framework, gaps and pore canals. The solid framework has a firm structure and stably material properties. The material has high rigidity, good toughness, corrosion resistance, rust resistance, heat resistance and pressure resistance. The gaps are near-spherical, the aperture sizes are uniform, and the apertures are controlled in the range of 1-50 microns, the gaps are uniformly distributed inside the test piece and on surface thereof. The pore canals are intersected and the average pore opening extent of the interconnected pore canals passing through two end faces is controlled in the range of 0.1-5% on the cross section. The invention is detected by permeation for a long time, has constant permeability parameters, high efficiency, high reliability and strong practicality. By using the permeation coefficients of the invention as a reference standard, the invention provides a detection method and tool as reference for global permeability test technique. The standard test piece based on a calibration permeability test is applicable to all permeability tests and in particular to the precision and measuring range of a calibration low-permeability testing method and device.

The Be-Cu alloy contains Be 0.2-0.6 wt%, Cr 0-0.5 wt%, Mn 1.8-3.0 wt%, Fe 1.8-3.0 wt% and Al 12.5-14.5 wt%, except Cu and inevitable small amount of impurity. It has hardness of HRC 42-52 deg, high heat conductivity, small friction coefficient, high wear resistance, high anticorrosion, smoothness and long service life.

To manufacture a cylindrical member, such as the nozzle body of a fuel injector, in which a fluid passage is formed at high productivity and to improve the reliability.

A cylindrical member, such as the nozzle body of a fuel injector, in which a fluid passage is formed is manufactured by drawing martenstic stainless steel. In addition, during the drawing process of martenstic stainless steel, an intermediate product is annealed and lug is removed after another drawing process, and then is subjected to drawing again to obtain a product.

The invention provides a manufacturing method of a radial strengthening sliding bearing static ring. The method comprises the steps that a static ring manufacturing mold is acquired, the mold comprises a core mold and a matrix coaxially placed outside the core mold, annular space is formed between the core mold and the matrix, and containing space is formed among the core mold, the matrix and a cover plate; a locating datum is arranged, a to-be-bonded component is cleaned, and a wear-resisting part is bonded to the outer cylinder face of the core mold; filler is assembled, cast tungsten carbide powder is dumped into the residual clearance of the annular space, locating powder is placed into the position above the cast tungsten carbide powder to form a locating layer, then a certain quantity of a bonding alloy is placed according to the proportion, a certain quantity of a fluxing agent is evenly scattered on the bonding alloy according to the proportion, and the mold is covered with thecover plate; the assembled and filled mold is sintered, and a static ring blank is obtained; and after air cooling, the static ring blank is machined, and the size of the static ring can meet the design requirements. By means of the method, the work life of a radial strengthening sliding bearing can be prolonged, and meanwhile the machining difficulty and manufacturing cost can be reduced.

The invention relates to a process for manufacturing a part, involving forming consecutive solid metal layers (20₁ . . . 20_n) that are stacked on top of one another, each layer describing a pattern defined on the basis of a numerical model {M), each layer being formed by depositing a metal (25), referred to as filling metal, the filling metal being subjected to an input of energy so as to melt and constitute said layer upon solidifying, the filling metal being in the form of a powder (25) that is exposed to an energy beam (32), resulting in melting followed by solidification such that a solid layer (20₁ . . . 20_n) is formed, the process being characterized in that the filling metal (25) is an aluminum alloy comprising at least the following alloying elements: —Ni, in a moiety of 1 to 6%, preferably 1 to 5.5%, more preferably 2 to 5.5%; —Cr, in a moiety of 1 to 7%, preferably 3 to 6.5%; —Zr, in a moiety of 0.5 to 4%, preferably 1 to 3%; —Fe, in a moiety of no more than 1%, preferably between 0.05 and 0.5%, more preferably between 0.1 and 0.3%; —Si, in a moiety of no more than 1%, preferably no more than 0.5%. The invention also relates to a part obtained by said process. The alloy used in the additive manufacturing process according to the invention makes it possible to obtain parts with remarkable features.

The invention discloses a method for preparing a SiGe thermoelectric material. According to the method, Si powder, Ge powder, B powder or P blocks are mixed according to a determined molar ratio; obtained mixtures are loaded into hard steel ball mill tanks under the protection of an Ar inert atmosphere; ball-milling and alloying are performed on the mixtures through using a planetary ball mill, sothat single-phase SiGe thermoelectric material powder is obtained; the single-phase SiGe thermoelectric material powder is subjected to discharge plasma sintering at 1150 DEG C, so that dense blockscan be obtained. The P type and N type SiGe alloy prepared by the method for preparing the SiGe thermoelectric material of the present invention have high electrical conductivity, high Seebeck coefficients and high power factors. The method for preparing the SiGe thermoelectric material of the invention has the advantages of high synthesis speed, simplicity, convenience, high efficiency and wide application prospect.

The invention belongs to a preparation method of an abrasive wheel for cutting of a blue glass infrared cut-off optical filter. Ultrafine-grain-size powder is adopted as raw materials of a metallic bond, better holding force on diamonds is achieved, the service life of the abrasive wheel can be prolonged, and the cutting speed of the abrasive wheel can be increased. By means of the composite mixing process adopting a three-dimensional mixer for premixing and ultrasonic wet mixing, the quality stability of the abrasive wheel and consistency of the cutting performance of the abrasive wheel are guaranteed. A certain amount of boron carbide and a certain amount of titanium diboride are added into the bond, do not participate in sintering and can fall off from the bond in time in the cutting process, and therefore keenness of the abrasive wheel is improved, the stable cutting capacity of the abrasive wheel is improved, and tool repair is avoided in the cutting process; and meanwhile due to the fact that the hardness of the two kinds of matter is high, the cutting assisting effect is achieved, and the cutting capacity of the diamond abrasive wheel is improved. The re-pressing process is adopted, an abrasive wheel blank obtained through hot-pressing sintering is strengthened, and therefore the density, rigidity and strength of the abrasive wheel are improved, and the mechanical performance of the abrasive wheel is further guaranteed.

The invention discloses a spheroidal graphite cast iron production method and spheroidal graphite cast iron prepared by the method, which relate to the field of a metallurgical industry. The production method disclosed by the invention comprises the steps of adding a nucleating agent when covering a spheroidizing agent, adding a nucleating agent before discharging molten iron for the second time after spheroidizing reaction is finished, adding a nucleating agent after discharging all molten iron and slagging-off, and adding a nucleating agent during pouring, so that molten iron is still at aneffective nucleating state during a whole pouring process, qualified spheroidal graphite form and quantity can be obtained, and the quality of the produced spheroidal graphite cast iron is ensured.

The invention provides a pattern block protective structure, a pattern block and a tire segmental mold. The pattern block protective structure is used for the pattern block of the tire segmental mold, the pattern block protective structure comprises a protective block which is assembled in a groove of a surface to be protected of the pattern block, the hardness of the protective block material is more than that of the pattern block, and the protective block is used for reducing abrasion of the pattern block to the to-be-protected surface when the pattern block is used. The pattern block protective structure has the hardness higher than that of a pattern block matrix, can reduce the abrasion of the pattern block when the pattern block is used, can prolong the service life of the pattern block, and can reduce the using cost of the segmental mold composed of the pattern block.

The invention belongs to the field of metallurgical industry and in particular relates to a preparation method of high strength and high hardness spheroidal graphite cast iron. The preparation methodcomprises the preparation steps of 1) calculating raw material amounts in proportion and preparing raw materials; 2) blowing a modifier into a smelting furnace, wherein the modifier and molten metal in the smelting furnace are fully and uniformly stirred, and leaving the mixture to stand and keeping the temperature; 3) casting ladle pre-treatment: paving a first nucleating agent on the outer surface of a spheroidizing agent and then paving a dregs remover on the outer surface of the first spheroidizing agent for spheroidizing treatment and first time nucleation; adding a second nucleating agent after drossing for second time nucleation and adding a nitrogen getter for quenching and tempering treatment; 4) carrying out casting to obtain a prefabricated part; and 5) carrying out thermal treatment. The technical scheme of the invention has the technical advantages that the prepared spheroidal graphite cast iron with high tensile strength and high material hardness is obtained as well under a circumstance that alloys such as Mo, Ni and V high in price are avoided, the production cost is lowered greatly, and the market competitiveness of a product is improved.

The invention relates to a process for manufacturing a part comprising a formation of successive solid metal layers (20₁ . . . 20_n), superposed on one another, each layer describing a pattern defined using a numerical model (M), each layer being formed by the deposition of a metal (25), referred to as solder, the solder being subjected to an input of energy so as to start to melt and to constitute, by solidifying, said layer, wherein the solder takes the form of a powder (25), the exposure of which to an energy beam (32) results in melting followed by solidification so as to form a solid layer (20₁ . . . 20_n), the process being characterized in that the solder (25) is an aluminium alloy comprising at least the following alloy elements: —Si; in a weight fraction of from 0 to 4%, preferably from 0.5% to 4%, more preferably from 1% to 4% and more preferably still from 1% to 3%; —Fe in a weight fraction of from 1% to 15%, preferably from 2% to 10%; —V in a fraction of from 0 to 5%, preferably from 0.5% to 5%, more preferentially from 1% to 5%, and more preferentially still from 1% to 3%; at least one element chosen from Ni, La and/or Co, in a weight fraction of from 0.5% to 15%, preferably from 1% to 10%, more preferably from 3% to 8% each for Ni and Co, in a weight fraction of from 1% to 10%, preferably from 3% to 8% for La, and in a weight fraction of less than or equal to 15%, preferably less than or equal to 12% in total. The invention also relates to a part obtained by this process. The alloy used in the additive manufacturing process according to the invention makes it possible to obtain parts with remarkable characteristics.

The invention relates to an output shaft material for a pneumatic performing mechanism and a preparation method for an output shaft. The output shaft material consists of the following components in percentage by weight: 1.2%-2.5% of Cu, 0.65%-1.0% of Mg, 0.15%-0.2% of Mn, 1.2%-2% of Ni, 1.6-2.4% of Zn, 0.42%-0.58% of B2O3, 1.5%-2.5% of SiO2, 1.2%-2.8% of TiC, 0.5%-1.5% of Re and the balance of Fe. The preparation method for the output shaft comprises the following steps of: preparing blank, pre-treating the blank, performing finish machining and performing quenching treatment. The output shaft has the characteristics of being relatively high in wear resistance, high in material hardness, small in thermal expansion coefficient, low in friction coefficient and the like. Meanwhile, the formula and the preparation process of the process material are improved, so that the output shaft material has good mechanical performance.

The invention provides a manufacturing method of a movable ring of a radially straightened sliding bearing. The method comprises the following steps of acquiring a movable ring manufacturing die whichcomprises a matrix and a sleeve die coaxially placed outside the matrix, wherein an annular space is formed between the matrix and the sleeve die, and an accommodation space is formed among the matrix, the sleeve die and a cover plate; arranging positioning reference, cleaning a to-be-bonded part, and bonding a wear-resistant part to an inner cylindrical surface of the sleeve die; assembling filler: pouring cast tungsten carbide powder into residual gaps of the annular space, putting positioning powder above the cast tungsten carbide powder to form a positioning layer, then placing a certainamount of bonding alloy in proportion, spraying a certain amount of fluxing agent uniformly to the bonding alloy in proportion, and carrying out covering by a cover plate; sintering an assembled and filled die to obtain a movable ring blank; and machining the air-cooled movable ring blank, wherein the dimension of the movable ring meets a designed demand. The service life of the radially straightened sliding bearing can be prolonged, and meanwhile, the machining difficulty and the manufacturing cost are lowered.