994 results about "Forming pressure" patented technology

Provided is a high-strength, bonded La(Fe, Si)₁₃-based magnetocaloric material, as well as a preparation method and use thereof. The magnetocaloric material comprises magnetocaloric alloy particles and an adhesive agent, wherein the particle size of the magnetocaloric alloy particles is less than or equal to 800 μm and are bonded into a massive material by the adhesive agent; the magnetocaloric alloy particle has a NaZn₁₃-type structure and is represented by a chemical formula of La_1-xR_x(Fe_1-p-qCo_pMn_q)_13-ySi_yA_α, wherein R is one or more selected from elements cerium (Ce), praseodymium (Pr) and neodymium (Nd), A is one or more selected from elements C, H and B, x is in the range of 0≦x≦0.5, y is in the range of 0.8≦y≦2, p is in the range of 0≦p≦0.2, q is in the range of 0≦q≦0.2, α is in the range of 0≦α≦3.0. Using a bonding and thermosetting method, and by means of adjusting the forming pressure, thermosetting temperature, and thermosetting atmosphere, etc., a high-strength, bonded La(Fe, Si)₁₃-based magnetocaloric material can be obtained, which overcomes the frangibility, the intrinsic property, of the magnetocaloric material. At the same time, the magnetic entropy change remains substantially the same, as compared with that before the bonding. The magnetic hysteresis loss declines as the forming pressure increases. And the effective refrigerating capacity, after the maximum loss being deducted, remains unchanged or increases.

An aircraft component, such as a wing, has perforations through an outer wall for boundary layer suction. In the space between the outer wall and an inner wall partition walls form pressure channels and suction channels that are adjacent to each other and alternate, which channels communicate with the perforations. For example, alternating channels may be formed by a corrugated structure having trapezoidal corrugations providing a larger area for the suction channels than for the pressure channels. The pressure channels may be coupled to a hot-air reservoir by a control device, lines and valves, and the suction channels may be coupled to a vacuum reservoir, unless a short-circuit valve is used to cross connect the lines.

The invention discloses a high-pressure gas injection hole-drilling pressure-releasing outburst prevention method which comprises the steps of: firstly, carrying out common drilling operation in a bottom plate stone drift (2) of a coal bed (1) in front of a coal mining or driving face; after a drill hole (3) enters a design depth of the coal bed, drawing back a drill, sending a jet nozzle (4) anda high-pressure drill rod (5) connected with the jet nozzle into the drill hole, and connecting a high-pressure gas-storing device (6) connected with the tail of the high-pressure drill rod (5) with a high-pressure gas compressing device (7) through a high-pressure tube; starting the high-pressure gas compressing device (7), carrying out near cylinder rotary impacting, cutting and holing on the hole wall of the drill hole in the coal bed (1) by using high-pressure impact wave as a power source through the jet nozzle (4) capable of jetting high-pressure airflow and automatically rotating to ensure that the coal body around the drill hole (3) is gradually crushed and separated from the hole wall to form pressure releasing space and subjected to the pressure balanced permeability increase through ground pressure and gas pressure action. According to the invention, the drainage efficiency of the gas in the coal bed is greatly improved and the outburst damage of the coal bed is reduced.

The invention provides a forming process of a curved composite tube. The forming process comprises the following steps of: manufacturing a forming die; preparing prepregs; laying up the prepregs; assembling the die; curing; and de-molding. The forming process has the beneficial effects that a closed and combined hard die is utilized as the forming die, a silicon rubber flexible die is utilized asthe inner cavity of the curved composite tube, and the size of the silicon rubber flexible die is determined by means of the forming pressure and the swelling property of silicon rubber, which solvesthe difficulties of the curved composite tube such as difficult de-molding process and difficult control of the cavity size of the product and ensures that the size of the inner cavity meets the requirements after the formed product is smoothly de-molded; the integral informing technology is adopted so as to solve the difficulties of extension positions at two sides of the curved composite tube such as difficult pressurization, difficult control of overall quality and the like, thus achieving the purpose of one-time forming of the product and meeting the requirements for dimensional precision; and by means of layering design and forming process control of a composite material, the problem of easiness in deformation of the formed curved composite tube is solved so as to meet the requirements for accuracy control of the product. The curved composite tube formed by the forming process has the advantages of better structural quality, higher performance, higher dimensional precision and higher curvature forming precision.

The present invention discloses a photocurable composition used for forming pressure sensitive adhesive layer. The photocurable composition comprises pressure sensitive adhesive binder, reactive acrylate, thermal curing agent and phtoinitiator. The pressure sensitive adhesive binder is composed of pressure sensitive adhesive polymer resin and low molecular weight acrylate which comprises carbon-carbon double bond and is led into side chain of pressure sensitive adhesive resin. The reactive acrylate comprises dimethyl cyclosiloxane unit in molecular chain. The invention also discloses a cutting rubber belt which comprises a pressure sensitive adhesive layer formed by the photocurable composition. When a thin wafer is installed on cutting rubber belt, cut and radiated by UV, no connection occurs. Therefore the maximum peeling strength between the pressure sensitive adhesive layer and thin wafer is quite low, and the collecting capability of thin wafer is excellent.

The invention discloses a multi-deformed bending forming method for a pipe fitting. The method comprises the following steps: 1) placing a tube blank into an inner cavity of a hydraulic bulging die, 2) filling up a cylinder at an external part of the hydraulic bulging die with liquid, and mounting a punch with a through hole and an overflow valve on the cylinder, 3) driving movement of a piston of the cylinder to extrude the liquid in the cylinder so as to obtain high-pressure liquid, and injecting the high-pressure liquid into the tube blank through the punch, so that the tube blank obtains a hydraulic pressure required for bulging, 4) starting applying an axial force to the end part of the tube blank by the punch when the piston contacts the punch arranged inside the cylinder, and 5) controlling the axial force by controlling a travel of the piston, and controlling the size of the hydraulic pressure for forming the tube blank by adjusting an overflow value of the overflow valve so as to gradually increase a forming pressure of a forming apparatus, so that a transition fillet of the tube blank gradually gets close to the hydraulic bulging die, and achieves the required shape. The invention also discloses a multi-deformed bending forming device of the pipe fitting. The procedure and the die are simplified and the cost is reduced.

The invention discloses a method for manufacturing a large silicon oxide ceramic sheet. The method comprises the following steps of: preparing blank soil particles serving as raw materials, preparing the green body of the large silicon oxide ceramic sheet, preparing the base body layer plain panel of the large silicon oxide ceramic sheet and preparing the large silicon oxide ceramic sheet finished product. The large silicon oxide ceramic sheet is prepared from the following raw materials in part by weight: 30 to 60 parts of needle-like wollastonite, 25 to 30 parts of clay, 15 to 20 parts of mullite, 15 to 20 parts of china clay, 10 to 20 parts of feldspar and 10 to 30 parts of bentonite; the needle-like wollastonite accounts for 28.57 to 36.36 percent based on the total weight of the raw materials; and the draw ratio of the needle-like wollastonite is (16.5-20):1. The method specifically comprises the following steps of: pressing blank soil particles serving as the raw materials to form the green body under the forming pressure of 6,000 to 7,000tons/m<2>; drying at the temperature of between 80 and 250 DEG C for 40 to 100 minutes; biscuitfiring the base body layer plain panel at the temperature of between 800 and 1,300 DEG C for 50 to 120 minutes; and glazing, printing, firing at the temperature of between 900 and 1,300 DEG C for 30 to 120 minutes to obtain the large silicon oxide ceramic sheet finished product. A rubber pad and redundant green body materials are completely recycled. The specification of the large silicon oxide ceramic sheet finished product is that: the ratio of length to width to thickness is 1,500-2,200mm to 800-1,500mm to 3-6mm.

A porous polyimide holder is prepared from pure polyimine powder through sieving, loading in mould, pressing, locking, sintering at 370-390 deg.C, keeping the temp for 5-40 mi, cooling and demoulding.

The invention discloses a numerical control precision progressive forming device and a precision progressive forming method for plates, and belongs to the technical field of plate processing. The device comprises a five-axis numerical control forming machine, a plate fixture, a data acquisition system and an optimal control module, wherein the plate fixture is arranged on a worktable of the machine; the data acquisition system is connected with the five-axis numerical control forming machine and the optimal control module respectively, and transmits processing parameters and control instructions; the tail end of a spindle of the five-axis numerical control forming machine is provided with a forming pressure head or a laser ranging system; and the laser ranging system is connected with thedata acquisition system and transmits a laser ranging signal. By alternately using the forming pressure head and the laser ranging system, cyclic operation including plate progressive forming, error measurement and formed path modified forming is completed. The device can save development cost of a die, avoid occupying a press, ensure the dimensional accuracy of sheet metal parts, and reduce material loss due to geometric errors in actual production.

This invention discloses a sintered NdFeB alloy magnetic materials preparation methods, the method is the weight of the shares in the 100 Nd-Fe-B alloy powder to add 0.01 to 0.2 in antioxidants, mixed after ground into a uniform particle size 2.8 - 4.5 mu m powder; good Nd-Fe-B powder in the mill to add 0.01 to 0.5 in the lubricant, argon or nitrogen, under the protection of uniform mixing obtained magnetic; will magnetic suppression after forming and sintering heat treatment, access to the final product . This invention in the Nd-Fe-B magnets milling through the process of adding antioxidants, in the process of accession lubricant mixture, in the suppression of the Nd-Fe-B magnetic particle forming process, the magnetic field intensity in the same circumstances raise powder orientation, thereby improving Magnetic products if the production is the same as the magnetic properties of magnets, we can reduce the forming pressure and time, so that get more capacity and reduce costs.

The invention relates to a design of an air seal structure of an electric spindle used for a grease film. The air with a certain pressure enters in an annular cavity between a baffle plate 3 and a front small cover 6 through an air passage 8 arranged on a front bearing seat 7 and then reaches an annular groove through a radial slant hole, a clearance is formed between the inner circle of the baffle plate and the outer circle of a front screw cap 2, a sawtooth-shaped groove is designed on the front screw cap and corresponds to the other annular groove of the baffle plate, the pressure air forms pressure air sealing rings in the clearance and the two grooves along with the rotation of the rotating axle at high speed, and the pressure air sealing rings are used for preventing the cooling fluid and the foreign impurities from entering in the rotating axle; an O-shaped sealing ring is sealed at the sealing point among the baffle plate, a dust cap and the front bearing seat for ensuring the air tightness of running of the pressure air in the air passage; and the sawtooth shape of the front screw cap can prevent a small amount of cutting solution from infiltrating, the small amount of the cutting solution can be thrown into the other annular groove of the baffle plate along with the rotation of the front screw cap, and then is discharged outside the electric spindle through the baffle plate and a guide groove or guide hole for the dust cap, so that the reliable air tightness is provided for the high-precision running of a bearing 9.

The present invention belongs to the field of marine technological instrument and equipment. One sample barrel with I-shaped sample cavity piston and one pressure accumulating barrel with pressure accumulating cavity piston are fixed to two ends of one containing body with axial small hole separately, to form pressure accumulating cavity, isolated water cavity, pre-sucking cavity and sample cavity. There are one one-way valve mechanism set in front of the sample cavity piston; varying-damp throttle mechanism comprising the throttle rod on pressure accumulating cavity piston and the small hole in the connecting body; valve plate, sampling valve and water sucking pipe in front end of the sample barrel; and inflating valve behind the pressure accumulating barrel. The present invention hashigh sample purity and automatically controlled sample speed, and is suitable for collecting deep sea hot liquid flow sample.

An internal high pressure method for forming tubular part with decreased forming pressure includes such steps as preshaping the tubular part to make its cross-section like a multi-petal flower shape, putting it in the cavity of lower die, closing upper and lower dies, and introducing high-pressure liquid to the tubular part to expand it for plastic deformation.

The invention relates to thermally-conductive and insulating polymer composite material with a three-dimensional isolation structure and a preparation method of the thermally-conductive and insulating polymer composite material. The thermally-conductive and insulating polymer composite material comprises, by weight, 70-99 parts of polymer powder and 1-30 parts of thermally-conductive and insulating filler. The preparation method includes the steps of firstly, mixing the 1-30 parts of thermally-conductive and insulating filler with the 70-99 parts of polymer powder, and mechanically grinding to prepare a thermally-conductive and insulating filler@polymer powder core-shell structure, wherein the grinding pressure is 3-30MPa, and the grinding time is 5-60 minutes; secondly, placing the thermally-conductive and insulating filler@polymer powder core-shell structure into a die to prepare the thermally-conductive and insulating polymer composite material with the three-dimensional isolation structure through thermo-compression formation, wherein the formation pressure is 5-50MPa, the formation temperature is 80-350 DEG C, and the formation time is 10-60 minutes.

The invention relates to a porous glass-ceramics and a method for preparing the same belonging to the glass-ceramics filter material field, which is characterized by preparing a glass powder of CaO-MgO-Al2O3-SiO2 system by means of water quenching using fly ash and rare earth tailings as raw materials; preparing the porous glass-ceramics mainly open pores by adding pore formers. The rare earth tailings of the invention not only contains the main chemical compositions for preparing the glass-ceramics, but also contains rare earth, niobium and fluorite as composite nucleating agents which can reduce the nucleation activation energy, improve the nucleation and crystallization of the glass to make the microcrystalline finer, thereby improving the mechanical property of the glass-ceramics. Meanwhile the cost for preparing the porous glass-ceramics is greatly reduced and the high intensity communicating pore porous glass-ceramics which satisfies different filtration objects with an adjustable porosity and pore size distribution are obtained by adjusting the species, granularity, dosage and forming pressure of the pore formers.

The invention belongs to the technical field of plastic forming, and particularly relates to a supersonic vibrating auxiliary plastic forming device. The supersonic vibrating auxiliary plastic forming device is characterized in that a servomotor is arranged in the middle of an upper crossbeam of a rack; a middle fixed crossbeam is provided with a coupler; a ball screw is connected with a spindle of the servomotor and penetrates through the coupler to be meshed with a ball nut; the ball nut is fixed on a movable crossbeam by a cylindrical sleeve; two ends of the movable crossbeam move up and down along guide rails by sliding blocks to drive an upper die to move, a pressure sensor is arranged between the upper die and the movable crossbeam and used for detecting the forming pressure between the upper die and a lower die; a vertical guide rail is provided with a precise grating ruler for detecting and controlling the position of the upper die. The supersonic vibrating assistant plastic forming device is simple and reliable in structure and capable of being used for supersonic auxiliary forming machining of metal materials of copper and nickel and non-metallic materials such as resin and rubber and can realize higher machining precision.

The invention relates to a method for preparing biomass molded coal, which comprises: (a) crushing and sieving raw coal and biomass, and mixing and heating in a first mode of mixing raw coal and biomass and heating to a preset temperature or a second mode of heating the raw coal and biomass to a first temperature and a second temperature respectively, mixing and heating to the preset temperature; (b) performing pressing molding of the mixture of the raw coal and the biomass, which is obtained in the first mode or second mode, by using a mold under a forming pressure; and (c) cooling the molded coal and demolding to obtain the biomass molded coal. In the method, the biomass contains lignin, the preset temperature is a temperature at which the lignin in the biomass softens or liquefies, and the first temperature is lower than or equal to the second temperature. When the method is used for forming fuel, the high-strength biomass composite molded coal can be produced without using adhesive.

The invention relates to a low temperature and low pressure BMC (Bulk Molding Compound) material. The low temperature and low pressure BMC material comprises unsaturation resin, a low shrinkage additive, a filler, a curing agent, a mold release agent, a polymerization inhibitor, an auxiliary and glass fiber, wherein the mold release agent is a mixture of zinc stearate and calcium stearate. The molding temperature of the low temperature and low pressure BMC material provided by the invention is only 110-130 DEG C and is reduced by about 30% when compared with the molding temperature of the traditional BMC molding material; and the molding pressure of the low temperature and low pressure BMC material provided by the invention is only 70-100 kg/cm2 and is reduced by about 50% when compared with the molding pressure of the traditional BMC molding material.

The invention discloses a filled 0-degree carbon fiber prepreg preforming tooling and a preforming process. The tooling comprises a forming pressure plate, forming mandrels, a base plate and limit stops, wherein multiple forming mandrels are closely and parallelly arranged on the base plate, the chamfers of the forming mandrels are consistent with an R angle of a long joist, filled 0-degree carbon fiber prepregs are located at the chamfers of the forming mandrels, the pressure plate is arranged above the mandrels, and the outer sides of the mandrels at the two ends are respectively provided with a limit stop. The preforming process comprises the following steps: (1) manufacturing a preforming tooling; (2) calculating the theoretic application amount of filled 0-degree carbon fiber prepregs; and (3) filling the 0-degree carbon fiber prepregs: weighting the 0-degree carbon fiber prepregs, cutting the 0-degree carbon fiber prepregs into fiber bundles with a size of 3-4mm, feeding the cut 0-degree carbon fiber prepregs into the preforming tooling, slightly compacting the prepregs by using a scraping plate, and after the prepregs are subjected to vacuum compaction on a heating platform at temperature of 70-80 DEG C for 15 min, transferring the prepregs to a normal-temperature workbench for cooling, and then taking out the obtained products. According to the invention, the forming quality of long joists is improved, and a situation that the shape of long joists after being manufactured is irregular is greatly improved.

The invention relates to a preparation process for high-density fine grain tungsten copper alloy. The alloy consists of 50 to 90 percent of W and 10 to 50 percent of Cu. The preparation process synthesizes the mechanical alloying advantage of ball milling and dry milling and the quick grain refining advantage of wet milling in the aspect of preparation of powder, and also synthesizes the liquid phase rearrangement advantage of liquid phase sintering and the forming pressure-reducing and sintering time-shortening advantages of solid phase hot-pressed sintering in the aspects of sintering process, so the high-density fine grain tungsten copper alloy with the relative density of 99.2 to 99.5 percent and tungsten crystal grain of 0.3 to 0.8 micron is prepared at the relatively low sintering temperature. The tungsten copper alloy prepared by the preparation process is uniform in structure, low in oxygen content, small in crystal grain and high in density; and the process is simple and the used equipment is industrial common powder manufacturing equipment and sintering equipment, so industrialized production is facilitated.