48 results about "Investment material" patented technology

The invention discloses a vacuum sealing method for high-temperature forming of a composite autoclave. The technical problem that a vacuum bag is prone to deformation at high temperature in the prior art is solved. The vacuum sealing method for high-temperature forming of the composite autoclave mainly comprises the steps of assembling of a forming mold, laying of prepreg, vacuum coating of the mold, curing of the autoclave and demolding. The vacuum bag used for wrapping the mold is made of aluminum foil or glass fiber reinforced aluminum foil. The plastic film has good ductility, electrical conductivity, thermal conductivity and shading performance, and can effectively block oxygen, moisture and peculiar smell. The problem of vacuum leakage in the curing process of polyimide and other high-temperature-resistant materials is effectively solved, and a reliable vacuum auxiliary material is provided for molding of products with high temperature resistance level and certain functionality. The method not only improves the forming quality of the composite material, but also reduces the production cost, and has remarkable economic benefits and social benefits.

The invention provides a granulation raw material, a pre-sintered body, a zirconia porcelain block, a fast firing production method and application. The fast firing production method comprises the following steps: S1, providing a first zirconium oxide material and a second zirconium oxide material; s2, compounding the first zirconium oxide material and the second zirconium oxide material, and granulating together with an auxiliary material to obtain a granulation raw material; s3, obtaining a green body based on the granulation raw materials; s4, carrying out pre-sintering treatment on the green body to obtain a pre-sintered body; and S5, machining the pre-sintered body, and then carrying out fast firing treatment to obtain the zirconium oxide porcelain block. On the basis of compounding of granulation raw materials, the overall performance of the zirconia ceramic block can be improved while a pre-sintered body can be rapidly sintered.

The invention relates to the field of metal material casting, and discloses a production method of green sand as-cast high-plasticity nodular cast iron QT800-5, which comprises the following steps: preparing pig iron, waste steel and foundry returns, and using auxiliary materials such as a silicon carbide pretreating agent, a high-temperature graphitization carburant, a rare earth magnesium silicon iron nodulizing agent, a silicon barium nucleating agent and a silicon strontium nucleating agent to prepare the green sand as-cast high-plasticity nodular cast iron QT800-5. The purity and component stability of molten iron are ensured; in the smelting process, purification and adjustment are carried out through temperature control and segmented addition of auxiliary materials, then spheroidizing is carried out through a pouring method, and the microscopic structure of a casting is optimized through ladle-to-ladle inoculation and stream inoculation; the final casting has excellent mechanical properties including the tensile strength larger than or equal to 800 MPa, the yield strength larger than or equal to 480 MPa, the elongation larger than or equal to 5% and the matrix pearlite content larger than or equal to 80%. The production process disclosed by the invention is simplified, is suitable for large-scale industrial production, and has a wide application prospect in lightweight application requiring high-strength and high-plasticity materials.

The invention relates to the technical field of laser processing, and discloses a laser processing method of a ceramic substrate, which adopts an ultrashort pulse laser and nanosecond laser dual-laser system process, integrates the advantages of precise surface modification of ultrashort pulse laser and efficient processing of nanosecond laser, and forms a micron-sized porous sacrificial layer on the surface of a ceramic material. Micropores and microcracks on the micron-sized porous sacrificial layer destroy the continuous heat conduction path of the original compact ceramic, and heat is gathered on the micron-sized porous sacrificial layer formed on the surface, so that when subsequent nanosecond laser acts, compared with the original smooth ceramic substrate, the generated cracks are easy to block, two-dimensional cracks are not easy to generate on the surface of the ceramic substrate, and the surface of the ceramic substrate is not easy to crack. And low-power and high-efficiency processing can be carried out on the ceramic material without coating an auxiliary material, and high-absorption and low-heat-influence processing is realized.

The present invention relates to the technical field of mechanical property testing of metal materials, and in particular to a testing method for obtaining material fracture properties based on 0.5T-CT specimen reconstitution technology. The testing method for obtaining material fracture properties based on 0.5T-CT specimen reconstitution technology comprises: preparing an original 0.5T-CT specimen of a base material, and carrying out a fracture property test to obtain a residual 0.5T-CT specimen after the test; testing and analyzing the base material to obtain a full-range equivalent stress-strain relation curve of the base material; determining the range of materials that can be used for preparing a reconstituted specimen; welding a reusable material and an auxiliary material for specimen reconstitution to obtain a reconstituted 0.5T-CT specimen; testing and analyzing a weld material to obtain a stress-strain relation curve of the weld material; determining fracture parameters of the reconstituted 0.5T-CT specimen; and on the basis of the fracture parameters, carrying out a fracture toughness test of the reconstituted 0.5T-CT specimen to obtain fracture properties of the base material and / or the weld material. The testing method in the present invention is simple, and the testing result is accurate.

The invention relates to the technical field of vacuum brazing of ceramic target materials and metal back plates, in particular to a vacuum brazing method suitable for binding of the ceramic target materials and the metal back plates, and the vacuum brazing method comprises the following steps that S1, ceramic and metal are pretreated; s2, brazing filler metal and auxiliary materials are prepared; s3, charging and vacuum control; s4, carrying out stepped heating and pressurization; and S5, cooling and post-processing. The method has the beneficial effects that the vacuum rate during brazing is adjusted in a gradient mode, temperature-pressure dynamic matching is achieved through cooperative adjustment, the performance of a vacuum brazing joint is improved, and the applicability is greatly improved.

The invention relates to the field of casting, and discloses a production method of green sand as-cast high-plasticity nodular cast iron QT450-18, which comprises the following steps of: preparing pig iron, waste steel and foundry returns according to a certain proportion, and preparing the green sand as-cast high-plasticity nodular cast iron QT450-18 by using auxiliary materials such as a silicon carbide pretreatment agent, a high-temperature graphitization carburant, a rare-earth magnesium silicon iron nodulizer, a silicon barium inoculant and a silicon strontium inoculant. And purity and component stability of molten iron are ensured. In the smelting process, purification and adjustment are carried out through accurate temperature control and segmented addition of auxiliary materials, then spheroidizing is carried out through a pouring method, and the microstructure of a casting is optimized through ladle-to-ladle inoculation and stream inoculation. The final casting has excellent mechanical properties, including tensile strength greater than or equal to 440 MPa, yield strength greater than or equal to 300 MPa, elongation greater than or equal to 16%, and V-shaped notch normal temperature impact absorption energy greater than or equal to 8 J. The method is simple and convenient to operate, high in production efficiency and suitable for large-scale industrial production.

The invention provides lightweight high-strength ceramsite and a preparation method thereof, and relates to the technical field of metallurgical industry solid waste recycling. According to the lightweight high-strength ceramsite provided by the invention, the steel slag is taken as a main raw material, the smelting slag and the coal gangue are taken as auxiliary materials, after reasonable proportioning and mixing, grinding and screening are performed, a ceramsite green body is prepared, after drying, the green body is put into a high-temperature kiln to be roasted, and finally a cooled ceramsite product is obtained. In the process, the smelting slag is used as a material which is rich in silicon and aluminum elements and has certain viscosity, so that the problem of poor plasticity of the steel slag can be solved, the quality of the ceramsite can be effectively improved, and the strength of the ceramsite green body can be improved; the coal gangue provides carbon elements and can provide heat for a roasting section, so that the reduction of energy consumption is facilitated. Due to the addition of silicon and aluminum elements, the final mineral phase is ordinary pyroxene, the cylinder compressive strength of the sintered ceramsite is increased, and the water absorption rate of the sintered ceramsite is reduced.

A manufacturing system for a multifunctional composite mala colored stone material, characterized in that: It comprises a raw material pretreatment module, a precision composite manufacturing module, a finished product post-treatment module, which are connected in sequence, and an intelligent control module that networks the respective modules; that the raw material pretreatment module contains an aggregate treatment unit and an auxiliary material treatment unit, for the aggregate treatment unit a link of “vibrating feed → jaw coarse crushing → cone medium crushing → VSI sand production-shaping → classification by means of a multi-deck circular vibrating screen” is used, through the classification aggregates are obtained in specifications of 30 meshes, 50 meshes, 80 meshes, 120 meshes, the auxiliary material treatment unit is equipped with an LM vertical mill and a drying-dehumidifying device;that the precise compound manufacturing module includes an intelligent dosing unit and a mixing modification unit, the intelligent feeding unit is controlled by a PLC control system networked with an electronic dosing scale, and the precision error of a proportional division is ≤ ± 0.5%.

The application discloses a molding method and tool of a composite material pattern plate in the technical field of composite material manufacturing, and comprises the following steps: S1: selecting an original mold with a target pattern as a basis, and preparing a molding negative mold which is complementary to the target pattern through a first composite material molding process; S2: taking the molding negative mold as a production mold, and preparing a composite material pattern plate with the target pattern through a second composite material molding process, wherein the first composite material molding process and the second composite material molding process are both vacuum introduction processes, and the vacuum introduction process comprises the steps of reinforcing material laying, auxiliary material arrangement, vacuum packaging, vacuumizing, resin injection, curing and demolding. The application adopts an existing stainless steel pattern plate as an original base mold, does not need to separately design and process a customized mold, and the molding negative mold can be repeatedly used, and meanwhile, the vacuum bag packaging tool is combined, so that the time cost and economic investment of mold preparation are greatly reduced, and the production demand of small batches and multiple varieties is adapted.

The invention belongs to the technical field of composite material manufacturing, and relates to a composite material structure non-autoclave combination die forming method which comprises the following steps: step 1, preparing a forming die; 2, auxiliary materials are prepared; step 3, blanking the composite material; step 4, paving a composite material in a non-autoclave; 5, the composite material obtained after laying is completed is subjected to mold closing and then packaged; step 6, carrying out vacuum detection on the packaged composite material; step 7, curing the composite material; according to the method, the air guide tows are arranged when the composite material is laid, the non-adhesive polytetrafluoroethylene cloth, the non-adhesive glass fiber cloth and other auxiliary materials are used when the composite material is compacted and packaged, and the air guide window is arranged in the R-angle area, so that the composite material structure manufactured through combination die non-autoclave forming effectively meets the product quality requirement. And compared with an autoclave forming process, the equipment cost and the energy power cost are effectively reduced by using the curing furnace for curing.

The present application relates to the technical field of aircraft body structure repair, in particular to a method for improving the adhesion of composite material bonding repair metal structure, comprising the following steps: determining the damage range by visual inspection and non-destructive testing method; then using artificial polishing method to pretreat the surface of the damaged part; preparing composite patch material, adhesive and related auxiliary materials; laying the patch according to the design requirements; packaging the vacuum bag, installing the heating unit and curing; post-processing the patch; checking the composite patch; according to the gap size and area size of different regions, cutting the appropriate size of glass fiber fabric; marking the installation position of the patch by using the red pencil line method; mixing the glue; cutting a layer of glass cloth, the size of which is larger than the total size of the required filling size, and the glass cloth is treated by dipping in glue. The present application can effectively control the thickness of the glue layer, increase the controllability of the repair process, improve the tensile shear strength after bonding, effectively improve the actual repair effect, and meet the actual use requirements.

The invention belongs to the technical field of composite material processing, and provides a process method for improving the quality of a small-size cap-shaped rib internal corner, which comprises the following steps: designing a female and male combined forming die according to the structure of a composite material cap-shaped rib; paving prepreg in a male mold forming area according to a paving layer structure required by the design of the composite cap-shaped rib, and compacting; taking down the compacted prepreg, transferring the prepreg into a female die forming die, and compacting the prepreg; after compaction, auxiliary materials for curing are laid on the surface of the prepreg; a core mold is laid on the surface of the auxiliary material and is compacted; continuing to lay the rest auxiliary materials for curing; and curing and molding. The method solves the technical problem that the surface quality of a composite cap-shaped rib structure is poor, and good thickness uniformity and R angle quality of a workpiece are achieved.

The invention discloses a process for preparing 95 aluminum oxide ceramic by using dry pressing and granulation powder tailings. The process comprises the following steps: S1, preparing raw materials; s2, performing pretreatment; s3, adding auxiliary materials; s4, mixing and homogenizing treatment; s5, adjusting and refining treatment; s6, granulating and forming; s7, sintering treatment is carried out; and S8, carrying out post-treatment and detection. According to the method, the tailings generated in the processing process are recycled as raw materials, so that resource waste caused by direct discarding of the tailings is avoided, and cyclic utilization of the materials is realized. The tailings are subjected to pretreatment such as sedimentation, ball milling, sieving and iron removal, and a proper amount of aluminum oxide micro powder is added, so that raw material components are uniform and pure; the dry pressing molding and sintering process are combined to ensure the densification of the green body, so that the prepared 95 aluminum oxide ceramic is superior to the traditional prior art in the aspects of voltage resistance, breaking strength, hardness and appearance quality, and the problems of low voltage resistance, surface stripes and the like of the traditional tailing recycled ceramic are avoided.

The invention discloses an iron-copper alloy-based friction plate and a preparation method thereof. The iron-copper alloy-based friction plate comprises the following raw materials in percentage by weight: 70-80% of iron-copper alloy powder, 7-15% of a friction reinforced phase composite material, 2-7% of a friction auxiliary material, 8-15% of a solid solution strengthening material, 0.7-1.5% of graphite and 0.5-1% of a lubricant, the friction reinforced phase composite material is a mixture of silicon dioxide, silicon carbide and aluminum oxide; the friction auxiliary material is a mixture of silicon-aluminum whiskers, calcium silicate whiskers, manganese-zinc alloy powder and carbon fiber powder; the solid solution strengthening material is zinc-tin-phosphorus alloy powder. The preparation method comprises the following steps: preparing materials; performing compression molding; sintering is performed; and machining and surface treatment. According to the invention, the raw material formulas cooperate with each other and cooperate with each step of the preparation method, so that the prepared product is good in wear resistance and stable in friction coefficient.

The utility model relates to the technical field of composite material manufacturing, and discloses a composite material rapid sealing device for monitoring ionic viscosity, which comprises an adhesive tape crimping device and an objective table, a first slide rail and a second slide rail are arranged on the objective table; the adhesive tape crimping device comprises a first chute, a second chute, a first end plate, a second end plate and a fixed knob; the first sliding groove and the second sliding groove are movably assembled on the first sliding rail and the second sliding rail respectively, the two ends of the first end plate are movably assembled in the first sliding groove and the second sliding groove respectively, the second end plate is fixed between the first sliding groove and the second sliding groove, and the fixing rotary knob is connected with one end of the first end plate. Compared with a traditional mode that the bag body needs to be totally closed through sealant, the first end plate and the second end plate in the adhesive tape crimping device can be matched with the fixing rotary knob to seal the unsealed edge of the bag body, and the sealing operation before each composite material curing monitoring experiment is omitted; and auxiliary materials used for packaging each time are saved.

The utility model provides an auxiliary material flattening device for molding and packaging a composite material pressure bag, which comprises a pressure equalizing plate, a flattening plate, a pressing plate, a pressing plate, a pressing plate and a pressing plate, wherein the pressure equalizing plate is provided with a non-working surface and a working surface opposite to each other; the electromagnet module is arranged on the non-working surface; and the tensioning positioning rod is arranged on the working face and can be attracted by the electromagnet module to tension the corners of the auxiliary material under the condition that the electromagnet module works. According to the auxiliary material laying device, the flatness in the auxiliary material laying process is guaranteed, material wrinkling and local deformation are avoided, and then the surface flatness of a formed plate is improved.

The invention discloses a lead-free low-Curie-temperature PTC thermistor and a manufacturing method thereof, the lead-free low-Curie-temperature PTC thermistor comprises a main material, an auxiliary material and a sintering aid, on the basis of 1 mol of TiO2, the main material comprises 1 mol of TiO2 and 0.6551-0.8817 mol of BaCO3; the molar ratio of CaCO3 to CaCO3 is 0.1145 mol to 0.3339 mol; the molar ratio of SrCO3 to SrCO3 is 0.0010 mol to 0.0038 mol; the molar composition of the auxiliary material is as follows: 0.0020 mol to 0.0060 mol of Y2O3; and the molar composition of the sintering aid is as follows: 0.010 mol to 0.0450 mol of SiO2 and 0.0050 mol to 0.030 mol of TiO2. The preparation of the PTC thermistor with the Curie temperature of 125 DEG C, the resistance value R25 of 4.5 omega + / -20% and the Curie temperature Tc25 of about 125 + / -5 DEG C can be smoothly realized by combining the formula proportion of the lead-free ceramic material with the existing tunnel furnace sintering process. Meanwhile, due to the advantage of low resistivity of the formula, tunnel furnace sintering and post-processing technologies are stable, and the material is suitable for mass production.

The present invention discloses a resin infiltration control system and its control method for the liquid molding VARI process. The control system includes: a mold, a preform, a fixture group, a vacuum bag group, a glue injection pipeline, a vacuum pumping device, and a semi-permeable membrane. The method includes: First, laying the preform above the mold; Second, laying an auxiliary material layer above the preform; Third, dividing the exhaust channels according to the thickness of the preform perpendicular to the resin infiltration direction, and drilling holes in the glue injection pipeline and the exhaust channels; Fourth, covering the holes of the exhaust channels with a semi-permeable membrane, and placing the glue injection pipeline and the exhaust channels above the auxiliary material; Fifth, performing steps such as sealing. The present invention establishes a "zero glue leakage" system for the composite material VARI process, which can accurately control the resin amount and reduce the resin waste phenomenon. Moreover, it controls the flow front of the resin infiltration process of the variable-thickness reinforcement preform, avoids the problem of air entrainment caused by the convergence of the flow front, and reduces the risk of quality problems such as dry spots and pores in the parts.

The invention provides a side wall plate which comprises a substrate layer and elastic layers, the elastic layers are laid on the two sides of the substrate layer, a plurality of hemp holes are formed in the elastic layers, the hemp holes are evenly distributed in the elastic layers in an array mode, the substrate layer is embedded into the hemp holes in a vulcanization mode, and the vulcanization gluing area of the substrate layer and the elastic layers is increased through the hemp holes. The invention further provides a through channel. The through channel comprises the side wall plate, a rotating shaft assembly and a vehicle body profile. The invention further provides a preparation method for preparing the side wall plate. The preparation method comprises the following steps: step 1, putting raw materials into the lower mold; 2, auxiliary materials are laid on the raw materials; 3, vacuumizing is conducted after mold closing; 4, the temperature and the pressure are kept till vulcanization is completed; and 5, opening the mold, and taking out the side wall plate. According to the side wall plate manufactured through the manufacturing method, the original strength of the side wall plate is kept, meanwhile, the elasticity of the side wall plate is improved, the service life is prolonged, and the side wall plate can be suitable for a more complex driving environment.

The invention relates to the technical field of additive manufacturing, and discloses a recyclable titanium powder-containing composite material, which is prepared by the following steps: weighing a base material, an auxiliary material and an additive after formula optimization, optimizing original reaction equipment, additionally arranging a heating system, a pressurizing system and a cooling system in a reaction kettle, and preparing the recyclable titanium powder-containing composite material. A jaw crusher, screening equipment, magnetic separation equipment and cleaning equipment are additionally arranged at the production beginning position, an unqualified composite material collecting device is additionally arranged at the production ending position and connected through a conveying belt, reaction kettle conditions are set and comprise the temperature, the pressure, the vacuum degree and the stirring speed, and the stirring speed is set in the initial stage, the middle stage and the later stage of reaction. The method comprises the following steps: adding formula materials in sequence, after reaction is completed, closing a heating and pressurizing system, starting a cooling system, cooling to room temperature, carrying out quality detection on the cooled composite material, treating the unqualified composite material and the recycled titanium-containing composite waste material according to the steps of the recycling equipment, and converting the unqualified composite material and the recycled titanium-containing composite waste material into a reusable composite material raw material. And cyclic utilization of resources is realized.

The invention belongs to the field of ceramic cores in the fields of aerospace, electronic information, precision investment casting and the like, and particularly relates to a preparation method of a special-shaped hole in a ceramic core. The method sequentially comprises the following steps that 1, a refractory metal pore-forming part is designed and machined according to requirements; 2, a refractory metal pore-forming component composite ceramic core is prepared, and a corresponding refractory metal pore-forming component is placed at the position where a special-shaped hole needs to be formed; and step 3, sintering the ceramic core, removing the refractory metal pore-forming component through high-temperature oxidation and sublimation, and forming the special-shaped hole in the ceramic core. The refractory metal is adopted as the template to prepare the special-shaped hole in the ceramic core, and the problems that the special-shaped hole in the ceramic core is difficult to machine and auxiliary materials are difficult to remove are solved.

The present invention relates to a ceramic tracing proppant, and belongs to the field of oil and gas exploitation aids. The ceramic tracing proppant of the present invention is mainly prepared from a neutron absorbing material and the following raw materials in parts by weight: 60-90 parts of bauxite, 30-90 parts of kaolin, and 1-5 parts of fluorite. The ceramic tracing proppant of the present invention has a very high compressive strength under a relatively low density, can effectively prop formation cracks, ensure a fracturing effect and provide an efficient channel for oil and gas output, and has a wide raw material source and a relatively low cost. In addition, the neutron absorbing material is used and fused with an existing neutron logging technology, such that permanent tracing can be achieved under non-radioactive conditions, and the crack height can be effectively, accurately, and quantitatively determined.

The invention discloses an investment material for casting large thick-wall parts. The investment material comprises the following components in percentage by weight: 30%-60% of petroleum wax, 30%-60% of tackifying resin, 1%-15% of synthetic wax and 1%-10% of a first high-molecular polymer. According to the investment material disclosed by the invention, the components are adopted, and the first high-molecular polymer is added, so that intertwining and crosslinking of molecular chains are realized, and the strength of an unsolidified layer in a thick-wall part of an investment is improved. And after the fired mold is demolded and freely cooled, the surface of the fired mold has a lower recess or shrinkage recess or even has no surface recess. In addition, the bending strength of the investment material is also improved.

The invention provides a barium-rich ceramic dielectric material, a multilayer ceramic capacitor and a preparation method thereof, and relates to the technical field of ceramic dielectric. The barium-rich ceramic dielectric material comprises the following components in percentage by mass: 97.0-99.5% of a main crystal phase A, a stoichiometric formula of BaxTiO3, 1.000 < = x < = 1.050, 0.2-1% of an auxiliary material B, TiO3 with a stoichiometric formula of (M, Mn), and 0.3-2% of a modified additive, wherein M is one or more of Mg, Ca and Sr. The preparation method comprises the following steps: carrying out step-by-step wet ball milling, calcining to prepare the main crystal phase A and the auxiliary material B, mixing with the modified additive, and carrying out ball milling and drying to obtain the ceramic dielectric material. When a multilayer ceramic capacitor is prepared on the basis of the material, the material, absolute ethyl alcohol and a PVB adhesive are mixed for pulping and film casting, after treatment such as overprinting and isostatic pressing with nickel slurry as an inner electrode, sintering is performed for 1.5-6 hours at the temperature of 1180-1300 DEG C in a reducing atmosphere, and the multilayer ceramic capacitor is prepared. The capacitor is excellent in dielectric property, is adaptive to a cheap metal inner electrode, and meets the X7R characteristic requirement.

A forming method of a composite material sharp-mouth-shaped front edge structure comprises the steps that firstly, a part is positioned through a forming device of the composite material sharp-mouth-shaped front edge structure, after the part is positioned, the part is subjected to vacuum packaging through an auxiliary material, and a prefabricated body is formed; clamping and pressing the prefabricated body through a clamp, a clamping strip and a vertical tool of the composite material sharp-mouth-shaped front edge structure forming device to form a sharp-mouth-shaped front edge structure prefabricated body; and finally, placing the sharp mouth type front edge structure prefabricated body in a curing oven, and curing according to the curing parameters of the glue film used by the front edge assembly. The clamping strip and the clamp are additionally arranged on the vertical tool for mechanical pressing, repeated use is achieved, energy consumption is greatly reduced, and the purpose of low-cost manufacturing is achieved; vertical tool forming can guarantee symmetry of skin shapes on the two sides of the front edge, tolerance can be evenly distributed on the two sides, and the aerodynamic shape precision of the front edge is guaranteed.

A rolling apparatus for an annular workpiece includes roller, a rolling wheel device, a base, and a stand. The roller has two circular frames that holds the annular workpiece therein using removable fixing members. After an outer circumferential surface of the annular workpiece is tightly wrapped by an investment material, the fixing members are removed to leave a through hole at the center of the investment material and the annular workpiece has its inner circumferential surface exposed at the through hole. The cylindrical rolling wheel of the rolling wheel device passes through the through hole of the investment material and rolls on the inner circumferential surface of the annular workpiece against a rolling platform of the base to increase the density of the annular workpiece. During the rolling operation, the investment material positions the annular workpiece and protects textures and patterns preformed on the outer circumferential surface.

The present invention discloses a water-cooled mold for casting an aluminum alloy motor case, comprising a top mold, a side mold and a bottom mold that cooperate with each other, a mold cavity being formed between the top mold, a diverter cone extending toward the bottom mold being provided on the top mold, and a positioning sleeve being further provided, wherein the bottom of the positioning sleeve is circumferentially provided with a plurality of first recesses, the top of the positioning sleeve is circumferentially provided with a plurality of first protrusions that can cooperate with the iron sleeve of the motor case, a second protrusion that cooperates with the first recess is provided in the middle of the bottom mold, the diverter cone is interference fit with the diameter of the positioning sleeve, and the structure further comprises a side mold water-cooling structure provided on the side mold and a bottom mold water-cooling structure provided on the bottom mold. The structure is produced by a low-pressure casting process. Due to the water-cooling process, the density of the casting is high and the quality of the casting is good. At the same time, the metal utilization rate is high and the consumption of auxiliary materials is small. The structure integrally casts the body and the end cover of the motor case, thereby simplifying the production process of the motor case, reducing the weight of the motor case and improving production efficiency.

The invention relates to an out-of-plane / in-plane differential response flexible sensing material and a preparation method thereof, and belongs to the field of flexible sensing materials. The chemical formula of the flexible sensing material is xAg / PDMS, the numerical value of x is 0-60 vol% and is not 0, x is the volume ratio of Ag to PDMS, the particle size range of Ag nanoparticles is 0.01-20 [mu] m, the functional auxiliary material of the flexible sensing material is a perovskite structure ferroelectric ceramic material (BCZT), and the volume ratio of Ag to BCZT is 3: 100. According to the flexible sensing material, silver nanoparticles and PDMS are compounded, and the silver nanoparticles are regulated by means of an external electric field to form Ag nanoparticle columns which are aggregated in the out-of-plane direction and are isolated from one another, so that the Ag nanoparticles are arranged in a chain shape in the out-of-plane direction, and differential response of high out-of-plane sensitivity / insensitive in-plane sensitivity is achieved; the construction of a quasi-conductive network is realized under the condition of low filling amount, meanwhile, good mechanical flexibility of the material is maintained, and the specific types and geometrical shapes of the conductive particles can be flexibly selected according to actual requirements.

The utility model relates to a turnover assembly type wall reinforcing steel bar positioning ladder frame which comprises vertical stand frames, reinforcing steel bar clamping grooves are formed in one ends of the vertical stand frames, supporting plates are arranged on one sides of the vertical stand frames, and the pair of vertical stand frames are symmetrically arranged at intervals; and the transverse support is arranged between the pair of vertical stand frames and is detachably connected with the vertical stand frames through a supporting plate. By adopting a modular structure, the device can be assembled and disassembled at any time, is free from one-time input of materials and can be used repeatedly, so that the input cost of the materials is greatly reduced. The distance between the pair of vertical stand frames is adjusted by replacing the transverse supports with the different bayonet distances, the device can be suitable for positioning and installing wall steel bars of different thicknesses, and the application range is wide.