1294results about How to "Reduced processing performance" patented technology

The invention discloses a halogen-free flame retardant antistatic polycarbonate composition and a preparation method thereof. The composition comprises the components based on parts by weight: 50-70 parts of polycarbonate, 5-20 parts of polymer which can form a third phase, 8-15 parts of impact modifier, 3-15 parts of phosphonium flame retardant, 0.2 part of fluoro-polyolefine additive, 1-10 parts of conducting material and 0.1-1 part of other accessory ingredient. When in operation, the polymer which can form the third phase, the phosphonium flame retardant, the conducting material and other accessory ingredient are firstly melted and extruded by a double screw extruder to prepare intermediate composition; after being melted and extruded by the double screw extruder, the intermediate composition, the polycarbonate, the impact modifier and the fluoro-polyolefine additive are pelleted and then dried. The composition prepared by the invention does not contain chlorine and bromine, has excellent antistatic property, flame retardance, impact resistance and formability and needs a little conductive filler.

A biodegradable copolyester (butanediester polysuccinate for example) is prepared from butanedioic acid, butanediol, copolydiol and copolydiacid through copolymerizing to obtain atactic linear copolyester, and condensation.

The invention belongs to the field of sheet metal and welding processing, and relates to an integral forming method for a thin-walled titanium alloy part with an irregularly-shaped curved surface. The integral forming method aims at overcoming the defects that the shape of parts processed through the prior art is limited or the procedure and the cost are higher, and effectively ensuring the precision forming of a thin-walled component with an irregular shape. The integral forming method comprises the steps as follows: a parting surface is determined; blanking is carried out; in the preforming step, a plate is bent from a flat into a circular arc through a bending die or a bending machine; welding is carried out; in the hot shaping step, a hot shaping die is put in the inner part of a part that is processed through the assembly welding under the ordinary temperature, and the part is supported tightly due to the dead weight of the die and is heated in a hot shaping machine; and in addition, a pressing machine applies pressure to the hot shaping die when the part is heated until material is softened, so as to enable the part to reach the needed size. The integral forming method comprehensively utilizes the advantages of various processes, can obtain the large-sized thin-walled titanium alloy part with the irregularly-shaped curved surface through only two weld joints, and achieves higher surface quality of the part.

The present invention provides one kind of copper alloy for connector and with low cost, high strength and excellent conducting performance and punching performance and its making process. The alloy contains Zn in 23-28 wt% and Sn 0.3-1.8 wt% and the sum of 0.25 Zn wt%+Sn wt% is 6.0-8.5. Through casting, cooling, hot rolling at temperature below 900 deg.c, repeated cold rolling and annealing, copper alloy belt is produced with 0.2 % yield strength over 600 N/sq mm, tensile strength over 650 N/sq mm, conductivity over 20 % IACS, youngs modules below 120 Kn/sq mm and stress relaxation rate below 20%.

The invention relates to a command point shaping, compressing and interpolating method suitable for a numerical control device. The method comprises the following steps of: inserting an arc which has a distance with the middle point of a tolerance set by the numerical control device and is tangential with segments of adjacent command points to the middle point of every three adjacent command points when a numerical control processing procedure judges that any three adjacent command points on a processed curve surface meet a continuous processing condition, wherein the tangential points are used as interpolation points; trimming the interpolation points to reduce calculation errors and rounding errors in the process of reckoning the interpolation points; selecting a characteristic interpolation point through judging the bending directions of processing paths of all the interpolation points; fitting by using a continuous polynomial spline curve with a second derivative to generate a smooth curve; approximately calculating the interpolation points of a current interpolation period and sending the positions of the interpolation points to a servo system of the numerical control device; and driving a servo motor to move. The invention furthest improves the processing efficiency and reduces the influences of the calculation errors and the rounding errors on the processing precision and the processed surface smoothness.

The invention discloses a precise die forging technique of a petroleum drill rod connector and is characterized in that: 1) flan material is prepared with a band saw; 2) the flan material is heated quickly at a temperature that is suitable for forging by a medium frequency electric induction furnace; 3) then the flan material is extruded in a close type into a prefabricated flan and a flan makes concave die on a quick flan-making oil hydraulic machine; 4) a molding concave by die level method extrudes and presses the prefabricate flan into a connector die forging piece on the quick flan-making oil hydraulic machine which can implement combination of the upper molding concave die and the lower molding concave die and relative extrusion and pressing from right and left and inner holes of the connector die forging piece is provided with wad; 5) finally a hole punching die punches away the recess inside the inner hole of the forging piece on a special hole punching oil hydraulic machine to obtain the connector forging piece with accurate specifications, excellent structure performance and central through holes. The invention has the advantages of good streamline distribution, material conservation, environmental protection and high production efficiency.

The invention relates to a ferrite stainless steel cold-rolled steel band and a manufacturing method thereof. The ferrite stainless steel cold-rolled steel band comprises the following chemical ingredients in percentage by weight: 0.02%-0.04% of C, 0.10%-0.50% of Si, 0.10%-1.00% of Mn, 14.0%-19.0% of Cr, less than or equal to 0.030% of P, less than or equal to 0.010% of S, more than 0% while lessthan or equal to 0.030% of N, more than 0% while less than or equal to 0.60% of Ni, and the balance of Fe and unavoidable impurities. The manufacturing method comprises the following steps: (1) smelting, i.e. smelting liquid steel according to the requirement of the steel band; (2) continuous casting, i.e. casting into a continuous casting billet; (3) casting billet hot rolling, i.e. rolling the casting billet into a hot rolled coil; (4) hot coiling annealing, i.e. preserving the temperature at 800 DEG C-880 DEG C for the temperature preserving time of 10-13 hours, freely reducing the temperature to 600 DEG C after the temperature preservation is completed; (5) cold rolling, i.e. adopting once cold rolling or twice cold rolling among cold rolled finished products; and (6) cold coiling annealing, i.e. controlling annealing temperature at 860+/-20 DEG C, and controlling annealing time according to 2-5 minutes/mm. The ferrite stainless steel cold-rolled steel band has good cold processingforming property and excellent crinkling and breaking resistance.

The invention discloses a method for hydrogenation of coal tar via a fluidized bed. The method comprises the following steps: subjecting a coal tar raw material to hydro-upgrading; carrying out separation to remove water; and then carrying out hydrorefining and fractionation so as to obtain a gasoline fraction, a diesel fraction and hydrogenation tail oil. A hydro-upgrading catalyst used in the method comprises iron oxyhydroxide, organic polybasic carboxylic acid, macroporous alumina, a molecular sieve and pseudo-boehmite; and a hydrofining catalyst used in the method comprises iron oxyhydroxide, organic polybasic carboxylic acid, macroporous alumina and a binder. The method provided by the invention adopts cheap iron oxyhydroxide as an active metal component, the hydro-upgrading catalyst and the hydro-refining catalyst are graded, so cost is low. According to the invention, moderate cracking of coal tar is carried out before refining of coal tar, so impurities in coal tar are effectively removed, product distribution and product quality are adjusted, and the running period of a device is prolonged.

The invention discloses a terahertz subharmonic frequency doubling and mixing device based on a monolithic integrated circuit. The device comprises a fundamental wave input waveguide micro-strip transition, a CMRC structure local oscillator low-pass filter, a frequency doubling matching circuit, a four-die frequency doubling diode, a local oscillator matching circuit, a frequency mixing diode, a radio frequency matching circuit, a radio frequency input waveguide micro-strip transition, and a CMRC structure intermediate frequency low-pass filter. According to the terahertz subharmonic frequency doubling and mixing device based on the monolithic integrated circuit, on the one hand, the number of dielectric substrates is decreased, and circuits are integrated on one substrate, so that the number of cavities to be processed is decreased, and processing and assembling are easy; on the other hand, waveguide transitions to be designed and processed are reduced, and the cavity size is reduced.

The invention relates to austenite stainless steel and a production method thereof, and belongs to the technical field of stainless steel processing. The stainless steel product mainly comprises the following chemical components in percentage by weight: less than or equal to 0.03 percent of C, 0.4-0.6 percent of Si, 1.0-1.5 percent of Mn, 16.5-18.0 percent of Cr, 10.0-11.0 percent of Ni, 0.010-0.050 percent of N, 2.00-2.50 percent of Mo, less than or equal to 0.040 percent of P, less than or equal to 0.003 percent of S, 20-40ppm of B and the balance of Fe and inevitable impure elements, wherein the DG value is between 6 and 9, the value of Md30 is 30DEG C below zero- 60 DEG C below zero. The production process comprises the following steps: intensively deoxidizing and desulfurizing, adding Fe-B to refine the grain size of an as-cast billet, adding Ca-Si wires into a ladle furnace (LF) and prolonging the time of soft blowing and standing, controlling the superheat degree to be 20-40 DEG C and constant pulling speed of 1.1-1.15m/min; and weakening secondary cooling water, performing hot rolling, cold rolling and thermal treatment, and pickling. By adopting the method, the problem of surface defects occurring in the stainless steel processing process can be alleviated, and the cold rolling yield can be increased.

The invention relates to a manufacturing technology for a half-axis sleeve tube, and the manufacturing technology comprises the following steps: blanking; forging; performing normalizing treatment; performing mechanical fine machining; performing quenching and tempering treatment; and performing the mechanical fine machining. In the manufacturing technology, a heating and forging method comprises the following steps: 1) mid-frequency inductively heating a round steel material to be at a preset temperature of 1100 DEG C to 1200 DEG C; 2) using a rolling forging machine to pre-forge and form; and 3) using a special 800-ton frame type hydraulic press to perform once die-forging forming treatment and completely running through an inner hole. According to the manufacturing technology, a processing process and labor hours are reduced, a tool cost is saved, a forged piece is free from any burr, the use ratio of materials can reach 99%, and the production efficiency and product quality of the half-axis sleeve tube are increased.

The invention provides a method for manufacturing ceramic of a multi-layer structure. The method includes the following steps that a common ceramic brick material is used for manufacturing surface blank, a foamed ceramic bottom blank material is used for preparing foamed ceramic bottom blank, the surface blank and the foamed ceramic bottom blank are pressed into multiple layers in a spaced mode, the uppermost layer of a tile serves as the surface blank, and after the surface blank is dried, a semi-finished product is obtained; the semi-finished product is colored and subjected to one-time cofiring to form a ceramic tile of the multi-layer structure where the foamed ceramic bottom blank layer and the non-porous surface blank layer coexist. The ceramic tile of the multi-layer structure has the advantages that the ceramic tile is light and convenient to attach, the surface blank is compact, and photochromism is high.

The invention discloses an organic-inorganic composite flame retardant agent containing a mesopore molecular sieve. The flame retardant agent comprises 0.1-50 weight percent of mesopore molecular sieve and 50-99.9 weight percent of organic flame retardant agent. The preparation method of the flame retardant agent and flame retardant resin containing the flame retardant agent are also disclosed. The composite flame retardant agent obtained through the invention plays roles of both the self-flame retardant function of organic flame retardant molecules and the mesopore molecular sieve and the synergistic effect between the organic flame retardant molecules and the mesopore molecular sieve. The flame retardant efficacy is improved greatly. In addition, the mesopore molecular sieve can also play a releasing role of a microcapsule. As a novel highly efficient halogen-free composite flame retardant agent, the organic-inorganic composite flame retardant agent can be widely applied to the polymer material flame retarding field.

The invention discloses a heat-resistant flexible transparent conductive film and a preparation method of the film. According to the film, the surface of PET is coated with coating, and then the film is prepared after being dried . According to the formula of the coating, the coating is composed of nanometer silver wires, oleoresin, additive powder, flatting agents and a proper quantity of organic solvents. The nanometer silver wires excellent in electrical conductivity and mixed additives composed of carbon fibers, nanometer limestone powder, nanometer palygorskite powder, nanometer aluminum oxide powder and propyl gallate are adopted for improving the electrical conductivity and the heat resistance of the film. The heat-resistant flexible transparent conductive film is low in cost and raw materials are easy to obtain.

The invention provides an inert and damping integrated gas-filled damper. The inert and damping integrated gas-filled damper comprises a cylinder barrel, a piston, a damping valve, a piston rod, a metal spiral tube, an external nitrogen gas tank and a floating piston, wherein the piston and the piston rod are connected and are arranged in the cylinder barrel for dividing the cylinder barrel into a rod cavity and a rodless cavity, and a damping valve is arranged on the piston; at least one of the rod cavity and the rodless cavity is communicated with the metal spiral tube; the floating piston is arranged in the external nitrogen gas tank, and used for dividing the external nitrogen gas tank into upper and lower cavities; the external nitrogen gas tank and the metal spiral tube are connected in parallel or in series; one of upper and lower cavities of the external nitrogen gas tank is communicated with the metal spiral tube; the rod cavity and the rodless cavity of the cylinder barrel, the metal spiral tube, and one cavity, communicated with the metal spiral tube, of the external nitrogen gas tank is filled up with oil, and the other cavity of the external nitrogen gas tank is filled up with nitrogen gas. The inert and damping integrated gas-filled damper disclosed by the invention is simple in structure, relatively few in components, easy to process and assemble, relatively low in cost, high in production efficiency, and the service life of the searching damper is greatly prolonged.

The invention discloses a bearing type RV speed reducer, and belongs to the technical field of speed reducers. The speed reducer comprises a pin wheel housing, an installation frame is arranged in the pin wheel housing in a rotary mode, the installation frame is provided with two cycloid gears in transmission connection with the pin wheel housing through needle rollers, the installation frame is rotatably provided with a power input shaft, the power input end of the power input shaft extends out of the installation frame, the power input shaft is provided with two eccentric drive wheels which penetrate through the centers of the two cycloid gears respectively and are matched with the corresponding cycloid gears, the installation frame is rotatably provided with at least two positioning shafts which are symmetric to the rotation center of the power input shaft, and each positioning shaft is provided with two eccentric transmission wheels which penetrate through the two cycloid gears respectively and are matched with the cycloid gears. Power center input and first speed reduction are achieved. Compared with the prior art, the bearing type RV speed reducer reduces the number of power input shafts and use of sun gears and planetary gears, manufacturing cost is low, transmission is reliable, machining and installation are convenient to achieve, and service life is prolonged.