60results about How to "Dimensional accuracy is easy to control" patented technology

The invention relates to a neutron absorbing material rapid semi-solid state temperature zone forming method, and belongs to the technical field of semi-solid state forming. The method is suitable forsemi-solid state forming plate blanks of particle (nano and micro scale) reinforced metal base composites. The method comprises the steps that a ball milling technology is adopted to prepare boron carbide and aluminum alloy mixed powder, and through isostatic cool pressing, a green body is obtained; technologies of hot pressing sintering, hot isostatic pressing and the like are carried out on solid and liquid two-phase semi-solid state temperature zone of an aluminum alloy, a high-compactness composite with ceramic particles evenly dispersed and distributed in an aluminum alloy base body isobtained, hot forging pressing, hot extrusion or hot rolling treatment is carried out on the aluminum alloy base body deformation temperature zone, heat treatment is carried out, and a high-compactness aluminum-based boron carbide neutron absorbing material with the uniform structure is made. Non-metallic materials are easily added, the preparing time is short, the material compactness is high, micrograph morphology is good, and production cost is low.

The invention discloses a process method for assembling and welding a pile leg of an ocean platform. According to the method, the production speed is high, and the percent of pass of products is high. A pile leg assembly is composed of a rack and two semicircular pipes. Coming cargo examination should be carried out on the rack and the semicircular pipes carefully, and the rack and the semicircular pipes are installed through a tool. The rack is turned over through a turnover device. The assembled pile leg examined to be qualified is lifted to an electric heating furnace stage trolley, conveyed into a furnace and heated, wherein the temperature ranges from 150 DEG C to 200 DEG C. The temperature in a hearth should be kept even. The heated pile leg is placed on the ground. Two welding joints are in the horizontal state. Manual welding rods are used for backing welding. Welding is performed on the pile leg by four welding workers from the middle position. The two sides are simultaneously and symmetrically welded. After welding is finished, the pile leg is turned over and welded continuously. After the welding joints are backed for 1 to 2 layers, the pile leg is lifted to roller carriers on a submerged arc welding production line and then formally welded. The welded pile leg is conveyed into a thermal treatment furnace, the heating temperature ranges from 200 DEG C to 280 DEG C and maintained for 2 to 3 hours, and then the pile leg is delivered out of the thermal treatment furnace.

The invention discloses a manufacture technology of a mask plate. The technology comprises the following steps: forming an electroforming layer through an electroforming technology, and etching an etched groove with a certain depth on the electroforming layer on the side near the opening of the electroforming layer, wherein the electroforming technology comprises the steps of film pasting (1), exposing (1), developing (1), and electroforming; and the etching technology comprises the steps of film pasting (2), exposing (2), developing (2), etching, and film removing. The effective deposition opening precision of the mask plate, which is prepared by the provided technology, is easy to control, thus the opening precision can be improved, and the hole wall of the opening formed by electroforming is smooth and convenient for mould removing. The etched groove prepared by the etching technology of the opening forms a bowl shaped hole wall which is matched with the opening prepared by the electroforming, the bowl shaped hole wall has a large conical angle, so that the hole wall will not shield the vapor plating material during the vapor plating process, and thus the film forming rate of vapor plating is increased.

The invention belongs to the field of automobile part processing and discloses a drilling processing and fixing device and method for a brake drum. The device comprises a chuck and a tool of an internal positioning device and comprises an upright post and an ejector rod of an external positioning device. The drilling processing and fixing device and method are accurate in positioning and drillingposition, high in dimensional accuracy, firm in fixing effect and wide in applicability.

A disclosed preparation technology for a mask plate comprises: firstly electroforming an electroformed layer through an electroforming technology, and then etching an etched groove with certain depth at the opening side of the electroformed layer through an etching technology, wherein the electroforming technology comprises first film pasting, first exposuring, first developing, electroforming and first film removing, and the etching technology comprises secondary film pasting, secondary exposuring, secondary developing, etching, and secondary film removing. The mask plate prepared by employing the provided technology has the opening formed by combining of an electroforming opening and the etched groove, the electroforming opening has smooth sidewall and is easy for demolding, the effective deposition opening precision is easily controlled, and the opening precision is improved; and the etched groove prepared by using the etching technology on the basis of an electroformed opening forms a bowl-shaped hole wall and is combined with the electroformed opening, due to the fact that the bowl-shaped hole wall has a large conicity, shielding of the hole wall to an evaporation material during evaporation is avoided, and the evaporation film-forming rate is improved.

The cathode system of conductive glass steel electric defroster can be used in the device for removing acid mist in the process that purifying the mercurial smoke in acid industry, belonging to the electric defroster area. The invention is formed by a cathode support beam, a cathode wire, a weight, and a lower cathode frame; wherein, the upper end of cathode wire is hanged on the cathode support beam, which is characterized in that the weight that connecting the lower end of cathode wire is formed by a sealed plastic outer cylinder and a inner lead weight; the lower cathode frame is formed by main beam and branch beam that made from plastic or glass steel; the branch beam has a hole adjusting plate; the weight outer cylinder is through the hole of said adjusting plate. In said system, lead weight inside the weight and the cathode wire are separated to effectively avoid the electric chemical erosion between them, and prolong the service life of cathode wire; the lower cathode frame has simple structure, high strength, and its hole adjusting plate make the position and distance adjustment of cathode wire easy; each cathode wire can be independently adjusted according to the shape of anode tube, with controllable size accuracy, lower weight, and easy installment; the electric field inside the conductive glass steel electric defroster is stable, with long service life, high defrosting efficiency and the acid mist outlet is not more than 3mg/NM3.

The invention discloses a gradient composite Fe-Al intermetallic compound microporous filter material and a preparation method thereof, and relates to the field of powder metallurgy preparation. Aiming at the problem that a Fe-Al filter material with high temperature corrosion resistance is difficult to prepare due to process limitation in the prior art, the invention provides the gradient composite Fe-Al intermetallic compound microporous filter material. The gradient composite Fe-Al intermetallic compound microporous filter material is characterized by comprising a matrix framework and a surface filter membrane outside the matrix framework, wherein the matrix framework is pressed and sintered prealloyed Fe-Al intermetallic compound powder; and the surface filter membrane is a mixture ofa binder, water and the prealloyed Fe-Al intermetallic compound powder which are coated on the outer surface of the matrix framework and then sintered for the second time. Therefore, the gradient composite Fe-Al intermetallic compound microporous filter material with high precision, large flux, low resistance drop, good back flushing regeneration characteristic, high strength and high temperaturecorrosion resistance is realized.

The invention belongs to turbine blisk technologies, and relates to an anti-vibration type dual-alloy turbine blisk and a manufacturing method thereof. The anti-vibration type dual-alloy turbine blisk is formed by welding a precision cast blade ring component and a sintered alloy blisk body in a diffusion mode through hot isostatic pressure, cut joints are formed between blade channels of the blisk, damping holes communicated with the cut joints are formed in the lower portion of the rim of the blisk, and friction dampers are arranged in the damping holes. The anti-vibration type dual-alloy turbine blisk is formed by welding the precision cast blade ring component and the sintered alloy blisk body in the diffusion mode through hot isostatic pressure, flexible selection and best usability matching of turbine disks and blades are achieved, meanwhile, the friction dampers are arranged on the blisk, the damping and vibration reducing effect is improved, the purposes of improving anti-fatigue ability of the blades and reducing vibration stress of the blades are achieved, and the anti-vibration type dual-alloy turbine blisk has great practical use value.

The present invention relates to a thermal structure composite material high-temperature anti-oxidation composite coating and a preparation method thereof. The preparation method comprises: carrying out thermal insulation on a thermal structure composite material for a first preset time at a first preset temperature, carrying out pre-oxidation, and naturally cooling the thermal structure composite material to a room temperature; under a protection atmosphere, embedding the thermal structure composite material into an embedding powder material, and carrying out thermal insulation for a second preset time at a second preset temperature to obtain a thermal structure composite material having a SiC coating; and spraying a spraying powder material onto the thermal structure composite material having the SiC coating under a preset voltage and a preset current by using a plasma spraying method to obtain the Si-Yb2Si2O7-ZrB2 coating. According to the present invention, the preparation method has advantages of simple preparation process, convenient operation, easily available raw material, and low preparation cost.

The invention discloses a weldless lightweight battery box body and a manufacturing process thereof. The weldless lightweight battery box body comprises frame profiles, frame corner connectors, crossbeams and a bottom plate, wherein the frame profiles are assembled together through the frame corner connectors to form a frame set, the cross beams are transversely installed in the frame set and locked with the left side and the right side of the frame set, and the bottom plate is connected to the frame set in a buckled mode and locked and fixed with the frame set; the frame set is sequentiallysubjected to the steps of coating the frame corner connectors with adhesive, inserting the frame corner connectors into one frame, inserting the frame corner connectors into the other frame, clamping,screw assembling, adhesive supplementing or smearing and curing; the cross beams are sequentially subjected to pre-fixing, structural adhesive coating, assembling and curing; and the bottom plate issequentially subjected to adhesive coating, adhering and FDS riveting. According to the weldless lightweight battery box and the manufacturing process thereof, large-area fusion welding and stirring welding can be removed, the cost and the efficiency are greatly improved, the size precision is easy to control, the deformation is avoided, the equipment cost is reduced, the adhesive coating processand the FDS process are used together, and high feasibility of an automatic production line is guaranteed.

The invention relates to a fixing structure of a front control board of a set top box and the set top box. The fixing structure of the front control board of the set top box comprises a shell, a first fixing part and a second fixing part. The first fixing part comprises a first limiting part and a first buckle, the second fixing part comprises a second limiting part and a second buckle, and when the first buckle and the second buckle are buckled to the front control board and installed in a first limiting groove and a second limiting groove respectively, the first buckle and the second buckle penetrate through two buckle holes formed in the front control board in advance respectively to be buckled. Because the fixing structure is provided with two fixing parts, the two fixing parts respectively comprise one limiting groove and one buckle, the front panel is fixed through the two oppositely arranged limiting grooves and two buckle structures hung upside down, the front control board can be stably fixed just by being installed in the two limiting grooves and buckled to the two buckles, no structure needs to be arranged on the front side wall, no screw needs to be used for fixation, the implementation difficulty of a mold is greatly reduced, the precision is very high, the difficulty in fixing the front control board is reduced, and the cost of the set top box is effectively reduced.

The invention provides a hard alloy integral type expansion-extrusion countersink for machining a deep hole. The countersink comprises a hard alloy circular cutter bar. The countersink is characterized in that the front half section of the hard alloy circular cutter bar is evenly provided with 4-6 twist bit-shaped spiral grooves, and the lift angle of each spiral groove is 20-25 degrees; the leading surfaces along the rotation direction of the excircle surfaces of the spiral bodies between every two adjoining spiral grooves are raised along the radial direction to have spiral blade belts, the circumferential belt width of each spiral blade belt is 0.5-1.2mm, the radial raised height of each spiral blade belt is 0.3-0.5mm, and the relief angle of each spiral blade belt is 0 degree; the front end face of each spiral body 5 is inwards concaved, the front end face of each spiral body is provided with a radial blade which is raised out of the front end face of each spiral body from the tail end of each spiral blade belt to the axial lead of the circular cutter bar, the width of each radial blade is 0.8-1.0mm, the concave inclined angle Q of the vertical plane between the front end face of each radial blade and the axial lead of the circular cutter bar 1 is 3 degrees, and the relief angle of each radial blade is 6-8 degrees. The hard alloy integral type expansion-extrusion countersink has the advantages that the countersink is good in manufacturability, and convenient to machine, the dimensional accuracy is easy and stable to control, and the expansion and the extrusion can be completed at once.

The invention provides a pump split type crosshead and relates to the field of high-pressure plunger pump components. The pump split type crosshead comprises a split type crosshead main body, a crosshead stretcher and a locking component; during the later actual using process, the wear degree of the crosshead stretcher is far less than that of the crosshead main body, so that a working staff can change the crosshead main body only, the later maintaining cost is further reduced, and the cost is decreased; in addition, the crosshead main body and the crosshead stretcher can be separately manufactured, so that later treatment to the cavity and the pin hole of the crosshead is further avoided, and the production efficiency is improved; and moreover, the locking component can lock the crossheadmain body and the crosshead stretcher in the axial direction to prevent the connecting part of the crosshead main body and the crosshead stretcher from breaking, so that the overall strength of the crosshead can be effectively improved.