40results about How to "Improve machinability" patented technology

This invention relates to the field of carbon fiber composite materials technology, and discloses a carbon fiber bundle composite filament coated with nanofiber yarn, comprising carbon fiber bundles and nanofiber yarn, wherein the nanofiber yarn coats the outer surface of the carbon fiber bundles; the carbon fiber bundles are high-modulus carbon fiber bundles, and the nanofiber yarn is prepared from polymer materials by conjugated electrospinning. This invention utilizes conjugated electrospinning technology to introduce a dense and uniformly distributed layer of nanofiber yarn onto the surface of high-modulus carbon fiber bundles, obtaining a carbon fiber bundle composite filament coated with nanofiber yarn. This composite filament exhibits good wear resistance and toughness, and its processability is significantly improved.

The invention discloses a novel metal test piece end face polishing and grinding device which comprises a test piece chuck, a pressing device, a straight driven piece, a plane cam, a movable sliding block assembly body, a linear guide rail structure and a movable frame. The test piece chuck comprises a dovetail matching block, a test piece chuck block, a pressing screw and a chuck fixing screw. The pressing device comprises a cover plate, a compression spring, a lifting block, a threaded pin and a rolling bearing; the straight follower comprises a lifting block, an indexing block and a limiting screw. By means of the novel metal polishing and grinding device, the problem that after traditional manual polishing and grinding equipment conducts polishing and grinding, cambered surfaces and fillets appear on the polishing and grinding end face is solved, the yield of metallographic samples and the utilization rate of consumable items such as abrasive paper are increased, a linear one-way polishing and grinding mode is researched, developed and provided, and a novel semi-automatic mechanical polishing and grinding device is designed.

The application provides an image-side telecentric F-Theta scanning lens and application thereof, and relates to the technical field of optical imaging. The image-side telecentric F-Theta scanning lens comprises a diaphragm, a first positive lens, a second negative lens, a third positive lens, a fourth negative lens and a fifth positive lens which are coaxially arranged in sequence along the light path propagation direction. The fourth negative lens and the fifth positive lens are glued to form a glued double lens, and share one glued surface. The diaphragm is located at the front of the lens, is spaced apart from the first lens by 36.71 mm, and serves as an aperture diaphragm of the system to limit the incident light beam. The image-side telecentric F-Theta scanning lens provided by the application not only has a simple structure, but also is applied to scenes such as hyperspectral microscopic imaging, multi-waveband fluorescent microscopic imaging and wide-waveband industrial detection, and can realize low-distortion, image-side telecentric high-quality scanning imaging in a wide spectral range, so as to meet the strict requirements of the microscopic imaging system on large-field uniform illumination and accurate geometric measurement.

There is provided a lead-free free-cutting beryllium copper alloy that is superior in machinability. The lead-free free-cutting beryllium copper alloy consists of from 1.80% to 2.10% by weight of Be, from 0.10% to 3.00% by weight of Si, from 0.20% to 0.40% by weight of Co, from 0% to 0.10% by weight of Fe, from 0% to 0.10% by weight of Ni, and the balance being Cu and inevitable impurities, wherein the beryllium copper alloy includes a matrix phase being an α phase, a Si-rich phase being a κ phase rich in Si, and Co-Be-Si intermetallic compound grains containing Co, Be, and Si, and optionally Fe and / or Ni.

A method for preparing a multi-component polyimide resin includes the steps of first preparing polyimide acid (PAA) and then preparing the multi-component polyimide resin. The multi-component polyimide resin employs a unique molecular structure design, which endows the material with excellent heat resistance. It exhibits superior heat resistance, maintaining structural stability and performance unchanged at high temperatures, which is particularly important for temperature-sensitive fields such as aerospace and electronic packaging.

The application provides a composite metal sodium negative electrode material, a preparation method thereof and a sodium metal battery. The composite metal sodium negative electrode material comprises a porous organic film skeleton, an alloy type conductive sodium-philic layer and sodium metal filled in the pores inside the porous organic film skeleton. The application takes the porous organic film skeleton as a base material, constructs a three-dimensional flexible skeleton, and deposits the alloy type conductive sodium-philic layer on the porous organic film skeleton, so that the active sites for sodium ion deposition are increased and the rapid transmission of sodium ions is promoted.

This invention relates to a bag-film laminate comprising a base layer, a gas barrier layer, and a sealant layer sequentially laminated together, wherein the amount of lubricant present on the surface of the sealant layer is 5 mg / m³. 2 Up to 25 mg / m 2 The surface roughness (Ra) of the sealant layer is 0.1 μm to 0.5 μm. The amount of lubricant is obtained by cutting the bag-film assembly into 100 mm × 100 mm sections in the MD direction and TD direction, dropping 5 ml of chloroform onto the surface of the sealant layer of the bag-film assembly and letting it stand for 1 minute to prepare a lubricant extraction solution, and then using gas chromatography to measure the amount of lubricant contained in the lubricant extraction solution.

The present application relates to the field of organic electrochromic materials, and particularly relates to a transparent conductive material, a preparation method and application. The transparent conductive material simultaneously introduces two independent carbonyl groups in a molecular main chain, and realizes accurate coordination of energy level, polarity and charge transport performance through differential regulation of oxygen or nitrogen atoms. The polymer can be used as an ion storage layer, an electrode modification layer or an active functional layer in an electrochromic device, can realize fast reversible optical modulation at a low voltage (±1.0 V), has a high optical contrast (ΔT 550 > 65%), a short response time (<2 s) and excellent cycle stability (more than 3×10 4 times of cycles, a retention rate >95%), and has a wide application prospect in the fields of intelligent display, energy-saving buildings and flexible electronics.

Provided is an electronic device that achieves both stability of electrical contact between terminals and sealing performance. A power supply unit 101 includes a power supply adjustment board 10 and a holder 100 that holds the power supply adjustment board 10, an accommodation member 20 that accommodates the power supply unit 101 inserted from an opening 20a, and a cap member 23 that closes the opening 20a, wherein a positive electrode terminal 42 and a negative electrode terminal 43 are arranged side by side in the accommodation member 20, a positive electrode terminal 14 and a negative electrode terminal 15 are arranged side by side on one end side in the power supply unit 101, a locking mechanism P that locks the power supply unit 101 is provided in the accommodation member 20 such that the positive electrode terminal 14 and the negative electrode terminal 15 of the power supply unit 101 are brought into electrical contact with the positive electrode terminal 42 and the negative electrode terminal 43 of the accommodation member 20, and power supply lines 27 and 29 are disposed to penetrate the cap member in a sealed state and configured for connecting an external power supply to the power supply adjustment board 10.

This invention relates to a PCB back-drill cover plate and its preparation method. The preparation method includes: (1) impregnating resin onto a backing paper A and baking it to obtain a resin semi-cured sheet; placing aluminum foil on a backing paper B and laminating it to obtain an aluminum foil backing paper; (2) stacking one side of the backing paper B with the resin semi-cured sheet and then hot-pressing it to obtain the PCB back-drill cover plate. This invention uses aluminum foil backing paper to replace traditional pure aluminum foil, which can reduce the thickness of the aluminum foil and enhance the processability by relying on the backing paper, solving the problems of easy wrinkling, stretching, and breakage in aluminum foil processing; at the same time, the preferred use of ultra-thin aluminum foil can also improve the back-drilling depth control accuracy, residual pile consistency, and hole concentricity, reduce the risk of overcutting and simplify the drilling process. By pre-laminating the aluminum foil backing paper and optimizing the paper weight and glue application amount, the support of the cover plate and the flatness of the board surface can be improved, and the separate glue application step on site can be eliminated, making the process simpler and the performance more stable.

The application provides a 800MPa-grade torsion beam steel and a preparation method, and belongs to the field of steel preparation.The chemical components of the torsion beam steel include:C:0.06%-0.09%, Si>0 and ≤0.6%, Mn:1.5%-2.1%, P≤0.015%, S≤0.003%, Nb:0.01%-0.05%, Ti:0.03%-0.07%, Cr:0.3%-0.7%, Al:0.3%-0.7%, N>0 and ≤0.005%;the internal microstructure of the torsion beam steel includes:≥85% of bainite, 5%-10% of residual austenite, and the rest of ferrite or martensite.Through reasonable design of the chemical components of the steel, the bainite structure containing residual austenite is obtained, the high strength and high forming performance of the raw material are realized, and the high strength and excellent processability of the torsion beam steel are simultaneously considered.

This invention discloses a deuterated scintillator with a space charge transfer structure, its preparation method, and its application in X-ray scintillation imaging, belonging to the field of scintillator materials. The scintillator structure of this invention is characterized by using tripterene as a bridging unit to connect a planar nitrogen-oxygen donor and a deuterated boron-oxygen acceptor. While ensuring high X-ray absorption capacity, it reduces the non-radiative transition rate, achieving a synergistic effect of high luminescence quantum yield, fast decay lifetime, and low self-absorption, thus meeting the requirements of high-resolution, high-sensitivity X-ray imaging. A transparent and highly flexible organic gel scintillator film is prepared by blending and polymerizing an X-ray-responsive organic scintillator with hydroxyethyl methacrylate. This film exhibits highly efficient luminescence under both photoluminescence and radiative luminescence conditions, significantly improving X-ray imaging sensitivity and resolution. Experiments show that the organic gel scintillator film prepared by this invention achieves a resolution of over 16.0 lp / mm under standard line-pair cards.

This invention discloses a low-carbon tin-containing free-machining steel and its production method. The weight percentage (wt%) of the chemical composition in the steel is: C 0.06-0.15, Si 0.10-0.30, Mn 1.50-1.80, S 0.40-0.60, P 0.06-0.10, Sn 0.30-0.50, Mn / S≥4.0, Sn / S≥0.80, O: 130-200ppm, with the remainder being iron and unavoidable impurities. This invention, through compositional design, controls Mn / S≥4.0 to improve the spindle morphology of sulfides, and Sn / S≥0.80 to achieve Sn aggregation near sulfides and grain boundaries, as well as aggregation and precipitation in other areas of the material matrix, which is more conducive to improving the material's machinability and reducing turning cracks. The Sn element is added using a combined addition technology of the tundish impact zone and the crystallizer nozzle, which improves the Sn yield.

This invention discloses a PVC cable sheath material, comprising the following components by weight: 100 parts PVC resin; 26-40 parts cold-resistant rubber; 45-53 parts cold-resistant plasticizer; 45-52 parts filler; 10-26 parts flame retardant; 9-15 parts heat stabilizer; 0.5-1.2 parts antioxidant; 2.0-3.5 parts lubricant; and 0-1.2 parts colorant. This invention also discloses a method for preparing the PVC cable sheath material and a cold-resistant and flame-retardant cable. The PVC cable sheath material of this invention has excellent cold resistance and flame retardancy, and can meet the requirements for cable sheath use in extremely cold environments of ~40℃ and below.

The invention relates to a melt spinning device for extruding synthetic filaments, in particular polyamide filaments, which release monomer and / or oligomer compounds during extrusion, comprising a spinning block (2) for extruding filaments (F), the spinning block having a spinneret (20) through which the synthetic filaments are extruded at a predetermined first temperature (T1) into an extrusion chamber (5) located between the spinneret and a cooling device for cooling the filaments, the cooling device (6) delimiting a cooling chamber (8) in which the filaments are cooled to a predetermined second temperature (T2), the extrusion chamber being extended from the cooling chamber by a decoupling extension (4) such that in an evaporation section (50) the first temperature (T1) is maintained at an evaporation temperature (TEVP) at which no exhaust gases (70), in particular monomer and / or oligomer compounds, are present in the decoupling extension (4) by condensation (K) resulting in a deposit.

The application discloses a method for applying photo-thermal orthogonal regulation color-changing fluorescent polymer hydrogel to temperature monitoring and anti-counterfeiting, using phase change materials, thermochromic molecules and photochromic molecules as raw materials, a series of photo-thermal orthogonal regulation color-changing fluorescent polymer capsules are prepared by adopting an emulsion-solvent evaporation method, then the prepared capsules are dispersed in hydrogel to prepare photo-thermal orthogonal regulation color-changing fluorescent polymer hydrogel, and the prepared hydrogel is used for temperature monitoring and anti-counterfeiting under photo-thermal orthogonal regulation after arrangement and combination. The prepared color-changing fluorescent polymer hydrogel has fast photoresponsivity and thermal responsivity, excellent light switching performance and high fluorescent contrast, a relatively narrow temperature response interval, temperature response sensitivity, and a simple preparation process, and has great application potential in the fields of data encryption, anti-counterfeiting and temperature monitoring.

The invention relates to a method for producing an injection molded part (50), wherein in particular the following steps are carried out in the following order: a) providing an insert film or insert sheet, wherein the insert film or insert sheet (10) comprises a haptics layer (11); b) applying a cushioning protection film comprising an adhesive layer (21) and a cushioning layer (22) onto the haptics layer (11) of the insert film or insert sheet (10); c) inserting the insert film or insert sheet (10) into an injection mold (60) of an injection molding machine such that the cushioning protection foil (20) is in contact with the walls of the injection mold (60); d) back injection molding the insert film or insert sheet (10) with a plastic compound to provide the injection molded part (50); e) removing the injection molded part (50) from the injection mold (60).

The application discloses a full-organic polymer dielectric film with a five-layer structure and a preparation method thereof. The dielectric film comprises five-layer films; the five-layer films comprise two low-loss high-breakdown layer films located at the outermost layers, two intermediate transition layer films arranged between the two low-loss high-breakdown layer films, and a high-dielectric layer film arranged between the two intermediate transition layer films; and the full-organic polymer dielectric film is prepared by bonding the five-layer films in a continuous hot-pressing process. The organic polymers with different properties are combined together by the method of multi-layer continuous hot-pressing, so that the advantages of each component can be fully exerted, the growth of the electric tree branches is inhibited by the differences between the layers of different components, and the breakdown strength is improved. The full-organic composite film has the advantages of high dielectric constant, high breakdown field strength and high discharge energy density.

This invention belongs to the field of LD steel preparation technology, and specifically relates to a method for preparing rare earth cerium-modified LD steel and its application. The method includes the following steps: S1, batching and smelting; S2, multi-directional forging; S3, spheroidizing annealing; S4, quenching treatment; S5, deep cryogenic treatment and tempering. This invention adds rare earth cerium in a specific form, utilizing its strong deoxidizing and desulfurizing capabilities to effectively reduce the content of gases and harmful impurities in the molten steel. Simultaneously, cerium can form a stable composite phase with inclusions in the steel, modifying the originally angular harmful inclusions into spherical or near-spherical shapes, significantly reducing the cutting effect of inclusions on the matrix, reducing stress concentration sources, refining grains, suppressing network carbides, and promoting dispersed carbide distribution. Ultimately, a well-matched LD steel with high hardness, high tensile strength, and high impact toughness is obtained, improving wear resistance and extending tool life.

This invention discloses a mild aqueous-phase synthesis method for ionic covalent organic framework nanosheets. Tp and Py are added to anhydrous ethanol at a molar ratio of 1:3. After reaction under stirring, a pale yellow solid is obtained by filtration, washing, and drying. This solid is used as an aldehyde monomer and reacts with an amino monomer containing ionic groups in a pure aqueous system under mild conditions catalyzed by Brønsted acid, thereby achieving the direct synthesis of ionic covalent organic framework nanosheets. By introducing Brønsted acid into the reaction system to regulate the hydrolysis rate of the aldehyde monomer and the formation rate of the covalent organic framework, the reaction can be completed in a pure aqueous system at room temperature and pressure, significantly simplifying the synthesis process and eliminating the need for toxic organic solvents, thus exhibiting good green sustainability. The obtained nanosheets have excellent processability and can be applied to the preparation of membrane materials such as nanofiltration membranes and tubular composite membranes.

The invention discloses a heat treatment method for reducing quenching and tempering state surface hardness of 15CrMoR, and belongs to the technical field of metallurgy. The heat treatment method comprises quenching and tempering heat treatment. In the quenching process, the heating temperature ranges from 830 DEG C to 840 DEG C, the total heating time ranges from 2.0 min / mm to 2.5 min / mm, and water cooling is conducted to the room temperature after discharging; and in the tempering process, the heating temperature is 720-730 DEG C, the heat preservation coefficient is 3-3.5 min / mm, and air cooling is conducted after discharging. The structure of the tempered steel plate is a two-phase structure of ferrite and tempered martensite. The produced steel plate has good obdurability matching, the surface hardness is smaller than or equal to 220 HB, and the crack defect in the machining process of rolling, welding and the like is avoided.

The utility model discloses a heat abstractor of circuit board. Heat abstractor of circuit board, include: heat abstractor and install the air -cooled group of heat abstractor, heat abstractor includes the heat conduction sheet, the heat conduction sheet is attached in electronic component side wall, and the heat conduction sheet outer wall installs several leaf fin, the air -cooled group includes the fan, and the fan is installed on the heat conduction sheet upper end through the connecting component, the fan drives the leaf fin periphery air flow, the heat conduction sheet and leaf fin constitute the heat abstractor unit, and multiple heat abstractor units are attached on electronic component side wall, and the elastic connection between each heat abstractor unit is equipped with the spring between two adjacent heat abstractor units, and one section of spring is fixed on the leaf fin, and the other end of spring is fixed on the leaf fin of another heat abstractor unit. The utility model provides heat abstractor of circuit board realizes the effect of heat dissipation from electronic component side surface through setting heat abstractor, and compared with the heat dissipation mode from the upper surface, and the heat dissipation efficiency of higher electronic component for the height is higher.

The fused BODIPY high polymer material provided in the application has a structure of formula (I), the main peak of the absorption spectrum thereof is located at 780 nm to 1600 nm, can cover the main energy area of near-infrared sunlight, and can realize efficient solar heat insulation; the maximum absorbance in the visible light area is not more than 15% of the main peak absorbance of infrared absorption, has good visible light transmittance and natural lighting effect; moreover, the fluorene group with large steric hindrance is introduced, the intermolecular stacking is significantly weakened, and the solubility and processability of the material are improved; meanwhile, the material has excellent photothermal stability and can maintain stable performance under long-term light and high temperature conditions. Therefore, the high polymer material provided in the application can be used in the field of transparent heat insulation materials, can realize efficient heat insulation effect under the premise of ensuring high visible light transmittance, and has good processability. Formula (I)

The present invention relates to a steel material comprising, in mass%, 0.30%≤C≤0.45%, 0.10%≤Si≤1.00%, 0.60%≤Mn≤1.20%, 0.20%≤Cr≤0.70%, 0.30%≤V≤0.47%, Ti≤0.015%, P≤0.100%, and S≤0.080%, the balance being Fe and unavoidable impurities, and having a P0 value defined by P0=P0'×V / P1, satisfying P0≥0.30, where P0'=Mn+0.49Cu+0.89Ni+0.40Cr-0.30Si, and P1=C+0.07Si+0.16Mn+0.61P+0.19Cu+0.17Ni+0.2Cr+V, in the formula, each element symbol represents the content of each element in mass%.

The utility model provides a kind of water hammer eliminator, including outer cylinder, compression spring and buffer plate;The lower end of outer cylinder is provided with the inlet for the water flow in pipeline to rush in;Compression spring is vertically arranged in outer cylinder, buffer plate is transversely arranged in outer cylinder and is connected with the lower end of compression spring, the length direction both ends of buffer plate are connected with pulley, pulley and outer cylinder inner wall sliding fit;Buffer plate is vertically reciprocated in outer cylinder by the elastic deformation of compression spring;It is more convenient to use, and service life is longer.

The application provides a high-toughness ferrite-pearlite type non-quenched and tempered steel and a manufacturing method thereof, and the composition of the steel is as follows: C 0.35-0.42%, Si 0.35-0.45%, Mn 1.25-1.65%, P ≤0.010%, S 0.025-0.050%, Cr 0.10-0.30%, Nb 0.02-0.05%, Mo 0.010-0.050%, Ni 0.10-0.25%, Al 0.025-0.045%, V 0.10-0.30%, Cu ≤0.10%, Ti 0.010-0.040%, [N] 120-160ppm, [H] ≤1.0ppm, T.O ≤10ppm; the rest is Fe and inevitable impurity elements; the steel is combined with a controlled rolling and controlled cooling process, the ferrite content is increased, the strength and toughness are improved, the strength and toughness are matched, and the cutting performance is improved.

An air conditioner including a refrigerant module includes a module housing and a first refrigerant chamber and a second refrigerant chamber formed in the module housing. The second refrigerant chamber is disposed adjacent to the first refrigerant chamber. The refrigerant module includes a first inflow flow path and a first discharge flow path formed in the module housing and fluidly connected to one of the first refrigerant chamber and the second refrigerant chamber. The refrigerant module also includes a second inflow flow path and a second discharge flow path formed in the module housing and fluidly connected to the other of the first refrigerant chamber and the second refrigerant chamber. The refrigerant module also includes an expansion valve disposed in the module housing and fluidly connected to the first discharge flow path, an expansion flow path formed in the module housing for the refrigerant expanded in the expansion valve to flow through, and a connection flow path formed in the module housing for fluidly connecting a compressor and a condenser.

This invention belongs to the field of iron and steel metallurgical refining technology, specifically relating to a method for treating inclusions in heavy rail steel using tellurium or calcium tellurium composite treatment. To reduce the Class A inclusion rating of heavy rail steel, this invention provides a method for treating inclusions in heavy rail steel using tellurium or calcium tellurium composite treatment. This method involves performing tellurium or calcium tellurium composite treatment during RH refining to improve the morphology of sulfides in the heavy rail steel. The tellurium or calcium tellurium composite treatment process employs inert gas soft blowing to enhance the circulation of molten steel in the ladle, thereby improving the effect of the tellurium or calcium tellurium composite treatment, reducing the Class A inclusion rating, and improving the machinability of the steel.

This invention discloses a crystalline polyimide / polyimide composite material, its preparation method, and its applications. The method involves first uniformly mixing phenylhexacarboxylic acid trihydride with a diamine monomer, followed by a solid-phase reaction under argon atmosphere protection. After the reaction, the product is immersed in a polar solvent to obtain crystalline polyimide. Then, the crystalline polyimide is added to an organic solution of polyamic acid, subjected to ultrasonic treatment in an ice-water bath, and subsequently thermosetting to obtain the crystalline polyimide / polyimide composite material. The crystalline polyimide in this composite material has a layered two-dimensional COF structure, giving it relatively high thermal conductivity, heat resistance, and high-temperature mechanical properties. Introducing the crystalline polyimide into the polyamic acid solution utilizes the special interfacial compatibility between the amino groups in the crystalline polyimide and the anhydrides in the polyamic acid to react, solving the problem of difficult processing and effectively expanding its application range.

The invention relates to a method for preparing para-aramid fibrid through a dissolution method. The method provided by the invention comprises the following steps: (1) dissolving: dissolving poly (p-phenylene terephthamide) (PPTA) in a composite solvent to obtain a poly (p-phenylene terephthamide) solution; and (2) fiber forming: adding the poly-p-phenylene terephthamide solution obtained in the step (1) into a coagulating bath, and stirring to obtain the para-aramid fibrid dispersion liquid. The method disclosed by the invention is simple in process, low in cost, low in equipment requirement, low in implementation difficulty and capable of obtaining the para-aramid fibrid with excellent performance. Moreover, according to the method disclosed by the invention, the waste material generated in the production process of the para-aramid fiber and / or the recovered para-aramid fiber product can be used as the raw material, so that the production cost is low, and the method is environment-friendly.