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750results about How to "Small thermal deformation" patented technology

Rhombic internal support clamp for round pipe welding

The invention discloses a rhombic internal support clamp for round pipe welding. The rhombic internal support clamp comprises at least one rhombic internal support unit, push cylinders corresponding to the rhombic internal support units one to one, two end covers, a main shaft and a plurality of pressing back-blowing modules, wherein the main shaft is arranged at the center of a round pipe, and both ends of the main shaft are respectively fixed in the centers of the two end covers; each push cylinder is fixedly arranged on the main shaft; each rhombic internal support unit comprises a positioning ring, a movable ring and at least one rhombic supporting frame; the positioning rings fixedly sleeve the main shaft; the movable rings sleeve the main shaft and can move back and forth along the main shaft along with the pushing of the corresponding push cylinders; one pair of diagonals of each rhombic supporting frame is respectively hinged to the corresponding positioning ring and the corresponding movable ring, and the other pair of diagonals of each rhombic supporting frame is respectively hinged to two supporting platforms; at least one pressing back-blowing module is fixed on each supporting platform. According to the rhombic internal support clamp, the internal protection problem for pipe welding is solved, the quality of welds is improved, and thermal deformation is relieved.
Owner:SHANGHAI PURUIMA INTELLIGENT TECH CO LTD

Numerically-controlled milking composite machine tool

The invention discloses a digital control turning-milling complex machine tool, which comprises a digital control machine tool body, a spindle system, a milling unit head, a cutting off tool rest, a tailstock, a longitudinal and horizontal feed system and a lubricating system, and is characterized in that a lower slide block is arranged on a saddle of the machine tool; the front end of the lower slide block is provided with the four-station electric cutting off tool rest; the back end of the lower slide block is provided with the milling unit head capable of lifting; a mill head spindle of the milling unit head is provided with a milling cutter or a drill bit; the lifting of the milling unit head is realized by a servo motor driving a ballscrew pair to rotate; and a variable-frequency motor drives the mill head spindle to rotate, and the rotating speed of the mill head spindle is changed through adjustment of the frequency of the variable-frequency motor. Through once clamping, the digital control turning-milling complex machine tool can realize turning-milling complex processing to achieve the aim of multiple functions of one machine; the machine tool realizes four-axis linkage controlled by four axes combined by an X axis, a Y axis, a Z axis and a C axis together through a digital control system; and the whole machine has good rigidity, and the dimensional precision of processed parts reaches IT 7 and the surface roughness Ra is less than or equal to 3.2 mu m.
Owner:CHANGSHA JINLING MACHINE TOOL

3D additive repair device for laser-arc hybrid welding and repair method

The invention discloses a 3D additive repair device for laser-arc hybrid welding and a repair method. The 3D additive repair device comprises a controller, a four-axis linkage platform, a laser vision sensor, an infrared vision sensor, a fixture, a laser welding torch, an arc welding torch, a filling welding wire, a wire reel and a gas guide pipe. The method includes the steps that a defective workpiece is mounted on a repair workbench; the laser vision sensor is driven to scan the three-dimensional profile of a defect; the three-dimensional profile of the defect is rebuilt through the controller; welding parameters are confirmed; the controller drives the near-infrared vision sensor to scan a molten pool, the time-frequency parameter of an image of the molten pool is obtained, a compensation control code is generated according to the time-frequency parameter of the image of the molten pool, and the set welding parameters are corrected in real time; and after repair is completed, the laser vision sensor is driven again to scan the three-dimensional profile of the defect, whether the repaired workpiece meets the standard or not is confirmed, and if not, the defect is repaired again till the repaired defect meets the standard. The 3D additive repair device for laser-arc hybrid welding and the repair method have the beneficial effects that the structure is simple, operation is convenient, and reliability and adaptability are high.
Owner:GUANGDONG UNIV OF TECH

Secondary mirror support structure of space optical remote sensor

A secondary mirror support structure of a space optical remote sensor comprises a primary mirror, a secondary mirror, a primary mirror frame, a secondary mirror frame, and secondary mirror support bars, wherein the secondary mirror frame is connected with the primary mirror frame through the secondary mirror support bars, and is parallel to the primary mirror frame; the primary mirror is fixedly mounted on the primary mirror frame; the secondary mirror is fixedly mounted on the secondary mirror frame; the primary mirror is parallel to the secondary mirror; each secondary mirror support bar includes two single plates and a plurality of stiffening ribs; both ends of the single plate are respectively connected with the secondary mirror frame and the primary mirror frame; and the stiffening ribs are arranged between the two single plates of each secondary mirror support bar. The secondary mirror support structure resolves the contradiction of small obstruction ratio, light weight and high rigidity of the support bars. Under the condition of the same obstruction ratio and the same weight, the double-plate structure provided by the invention can greatly improve the rigidity and the thermal stability of the structure in comparison to the conventional single-plate structure; and the specific manifestations are that the fundamental frequency is improved by more than one time, the deformation displacement in the optical axis direction is reduced to about 10% that of the conventional single-plate structure, and the double-plate structure has lower vibration response and less thermal deformation.
Owner:BEIJING RES INST OF SPATIAL MECHANICAL & ELECTRICAL TECH

Five-axis linkage horizontal machining center machine tool

The invention discloses a five-axis linkage horizontal machining center machine tool. A lathe bed comprises a horizontal lathe bed and a longitudinal lathe bed. The machine tool is characterized in that: the horizontal and longitudinal lathe beds are arrange in a T shape; a rotary table moves side to side, namely performs X-axis motion on the horizontal lathe bed; an upright post moves back and forth, namely performs Z-axis motion on the longitudinal lathe bed; a spindle head drives a spindle to move up and down, namely performs Y-axis motion on the upright post; the spindle swings around the axis of the A axis, namely performs A-axis motion; the rotary table rotates around the axis of the Y axis, namely performs B-axis motion; the X axis, Y axis, Z axis, A axis and B axis can realize five-axis linkage machining; the A-axis single spindle head has a wide pendulum angle ranging from -120 to +95 degrees; a double-exchange workbench is matched in front of the horizontal lathe bed; the right of the longitudinal lathe bed is provided with a magazine tool and a tool changing mechanical arm, and also provided with a tool measuring and workpiece measuring device; and the moving upright post has a front-and-side bidirectional variable cross section structure. The five-axis linkage horizontal machining center machine tool is suitable for machining medium and large titanium alloy aviation structures at high efficiency and high precision, and meets the requirements on high-efficiency high-precision machining equipment for the titanium alloy aviation structures of the domestic aerospace industry.
Owner:ZHONGJIE MACHINE TOOL

Self-lubricating wear-resistant composite coating for titanium alloy surface and preparation method of self-lubricating wear-resistant composite coating

The application provides a self-lubricating wear-resistant composite coating for a titanium alloy surface and a preparation method of the self-lubricating wear-resistant composite coating. The method comprises the following steps: mixing mixed alloy powder and a binding agent, and then coating on the titanium alloy surface to form a pre-paving coating, wherein the mixed alloy powder comprises the following components in percentage by weight: 59-62% of nickel, 18.5-21% of chromium, 5-8% of boron, 6.5-10% of silicon and 3-7% of hexagonal boron nitride. The pre-paving coating is irradiated by adopting laser beams so as to obtain the self-lubricating wear-resistant composite coating. The mixed alloy powder comprises nickel, chromium, boron and silicon with the contents and can take an excellent anti-wear effect; and meanwhile, the mixed alloy powder comprises a proper amount of h-BN, thus the frictional wear of the coating and the frictional wear between the coating and a mating plate can be reduced, and the high-temperature wear-resistance service life of a titanium alloy can be significantly prolonged. The self-lubricating wear-resistant composite coating provided by the application adopts a laser cladding technology, ensures that a coating micro-structure is fine and compact and can be firmly combined with a titanium alloy matrix, and can be used for significantly improving the comprehensive mechanical performance of the titanium alloy.
Owner:SUZHOU UNIV

Mill of coffee-making machine

The invention relates to a coffee machine grinder which comprises a grinding head, a cutter head, a cutter cover and a transmission mechanism. The grinding head is installed and fixed at the upper end of a vertical rotating shaft in the grinder, and the underside is provided with the cutter head. The cutter head and the cutter cover arranged in the grinder are in clearance fit. A coffee turnplate is also fixed in the vertical rotating shaft. The lower end of the vertical rotating shaft is connected with the transmission mechanism in a driving way. The coffee machine grinder is characterized in that the cutter head and the cutter cover are made from ceramic material; furthermore, the cutter head is spliced and connected with the coffee turnplate by a positioning pin; an elastic element is supported between the opposite surfaces of the cutter head and the coffee turnplate. The coffee machine grinder is provided with the cutter head and the cutter cover made from ceramic material and is combined with an elastic mechanism to ensure that a cutter head component is hard wearing, resists high temperature and corrosion and has less thermal deformation, high hardness and large strength, so as to ensure that the grinder grinds meals uniformly, outputs meals fast, reduces noise, has reasonable structure and is practical.
Owner:NINGBO HAWK ELECTRICAL APPLIANCE CO LTD

Method for machining gas compressor fixed blade ring of gas turbine

The invention provides a method for machining a gas compressor fixed blade ring of a gas turbine. The method comprises the steps that a fixed blade ring blank is placed on a permanent magnetic chuck workbench of a machine tool, and clamped by the permanent magnetic chuck workbench, and the outer circumferential surface, the annular inner conical surface and the upper end face of the fixed blade ring are turned at a time; the bottom plane is machined; the turned fixed blade ring blank is placed on a working platform of a five-axis numerical control wire cutting machine, the cutting inclination of the five-axis numerical control wire cutting machine ranges from 0 degree to 60 degrees, and is adjustable, and the axis of the fixed blade ring blank coincides with the axis of a rotary platform of the five-axis numerical control wire cutting machine; the cut portion of a wire electrode of the five-axis numerical control wire cutting machine is made to be opposite to a molded line inclined groove in the annular inner conical surface in position by adjusting the rotary platform on a machine tool body, the inclination angle of the cut portion of the wire electrode is equal to the inclination angle of the molded line inclined groove, and the molded line inclined groove is machined; the rotary platform on the machine tool body is adjusted repeatedly, and machining of all the molded line inclined grooves is accomplished. According to the method for machining the gas compressor fixed blade ring of the gas turbine, the machining cost is low, the machining speed is high, the degree of thermal deformation is low, machining stability is good, and machining precision is high.
Owner:SHANGHAI ELECTRIC POWER GENERATION EQUIPMENT CO LTD

Composite material precision molding tool for airplane and precision molding manufacturing method

The invention relates to a composite material precision molding tool for an airplane and a precision molding manufacturing method. In a single large-scale part composite material molding process, the size precision is affected by many factors such as a mould material and structure, a composite material laying angle, layers and curing processes. The composite material precision molding tool provided by the invention comprises a set of special mould for test piece preparation, a test piece, an easy molding mould, a thin-shell mould and the like; the composite material test piece is prepared on the special test piece preparation mould, a transformative database is built by analyzing the transformation rule of the test piece, and a product digital model is converted into a process digital model by compensating molding errors by using CATIA software. According to the process digital model, a molded surface of the thin-shell mould is manufactured on an easy molding mould transition tool, and the composite material product is manufactured by utilizing the molded surface of the thin-shell mould, so that the molding quality and accuracy of the composite material can be improved, the design difficulty of the molded surface of the mould and the mould manufacturing cost are reduced, the thermal capacity of the mould is effectively reduced, and the optimization of curing reaction is facilitated.
Owner:哈尔滨新科锐工艺装备制造有限公司 +1

Method for forming grating for machine tool measurement in two-step solidifying rolling pressing forming manner

The invention relates to a method for forming a grating for machine tool measurement in a two-step solidifying rolling pressing forming manner, which comprises the following steps: 1) coating an ultraviolet light solidifying adhesive layer on a grating blank substrate; 2) manufacturing a rolling mould having a prototype grating structure on the surface of a cylindrical mould, making an alignment mark, and polishing and performing low surface energy treatment on the surface of the rolling mould; 3) coating a flexible film on the adhesive layer on the grating blank substrate, carrying out primary exposure and peeling the film; 4) comparing the alignment mark on the grating blank substrate with an acquired alignment mark image on the surface of the rolling mould, adjusting and calibrating; 5) gluing the rolling mould with the grating, applying a pressing force, and compounding the prototype grating structure on the surface of rolling mould on the adhesive layer on the surface of the substrate; 6) carrying out exposure on the compounded ultraviolet light solidifying adhesive layer; and 7) collecting and packaging the grating. According to the method, the required pressing force is small, and thus, the substrate deformation and stress concentration are avoided. The method has high production efficiency and can be used for realizing the mass production of the grating for large-area and altitude machine tool measurement.
Owner:XI AN JIAOTONG UNIV

Method for manufacturing metal composite plates by stirring friction

The invention discloses a method for manufacturing metal composite plates by stirring friction, relating to a method for manufacturing metal composite plates. The invention solves the problems of uneven welding layer surface, complicated working procedure and narrow application range of the existing method for manufacturing metal composite plates. A metal shroud plate is arranged on the upper end surface of a metal substrate, and the metal shroud plate and the metal substrate are both fixed on a worktable; a stirring head is arranged on optional position of the upper surface of the metal shroud plate; the included angle between the stirring head and vertical direction is from 0 to 10 degrees, the stirring head penetrates through the metal shroud plate to embed the metal substrate at the rotation speed of 200 to 3000 revolutions per minute, the embedding speed of the stirring head is 1-5mm / min, and the embedding depth in the metal substrate is 0.1-100mm; when the stirring head reaches set embedding depth, the stirring head moves along horizontal direction at the speed of 10-1000mm / min until the metal substrate and the metal shroud plate are combined. The method of the invention has simple operation, low cost, and no contamination in the manufacturing process.
Owner:HARBIN INST OF TECH

High-speed high-precision built-in dynamic and static piezoelectric main shaft

The invention relates to a high-speed high-precision built-in dynamic and static piezoelectric main shaft. The high-speed high-precision built-in dynamic and static piezoelectric main shaft is characterized in that the main shaft comprises a box body, a front bearing and a rear bearing are arranged in the box body through a front bearing end cover and a rear bearing end cover correspondingly, and the front bearing and the rear bearing jointly bear a main shaft body internally provided with an online dynamic balancing head; the box body is provided with an oil inlet and an oil outlet, the oil inlet communicates with the oil outlet through an oil way, the oil way is divided into two parts, and one part enters the front bearing and the rear bearing through the oil inlet to suspend the main shaft body in a gap between the front bearing and the rear bearing to form pure liquid lubrication; and the other part is fed to the front bearing and the front bearing end cover to make the main shaft body achieve axial positioning, and a grinding wheel is arranged on the front bearing end cover through a flange disc. The high-speed high precision built-in dynamic and static piezoelectric main shaft is simple in structure, good in dynamic performance, large in rotation number of the main shaft, high in rotation precision and small in heat deformation and can be widely applied to grinding wheel electric main shafts of precise grinding machines, main shafts of numerical control machining centers and precise lathes and the like.
Owner:DONGHUA UNIV

Reel-to-reel hot roller coining forming method for micro-nano structure on surface of polymer

InactiveCN106113479AAccelerate filling flowReduce apparent viscosityMicro nanoPolymeric surface
The invention relates to a reel-to-reel hot roller coining forming method for a micro-nano structure on the surface of polymer. The reel-to-reel hot roller coining forming method comprises the steps that a polymer material is conveyed to a preheat roller from an unreeling device, preheated to the attaching temperature and attached to a base band in a hot pressing mode; the polymer material attached to the base band is conveyed to the position between a mold roller and a pressure roller and heated to the coining temperature through the mold roller heated in advance, and then a mold cavity is filled with the polymer material through the action of the pressure roller; mold filling and supersonic vibration assembly starting are conducted at the same time, and the reel-to-reel hot roller coining process is completed with assistance of supersonic vibration; the polymer material is conveyed out from the position between the mold roller and the pressure roller, and then cooled and separated from the position inside the mold roller; and after demolding is completed, a polymer product is continuously cooled, separation of the polymer product and the base band is achieved, and finally reeling is conducted. According to the reel-to-reel hot roller coining forming method for the micro-nano structure on the surface of the polymer, the reel-to-reel hot roller coining process is improved through supersonic vibration, the mold filling process is accelerated, the duplication precision is improved, and the demolding force and demolding deformation are reduced; and the reel-to-reel hot roller coining forming method is advanced.
Owner:SHANGHAI JIAO TONG UNIV

Cooler of static chuck of extreme ultraviolet photolithographic mask platform

A extreme ultraviolet photoetched mask electrostatic chuck cooler is disclosed, array thermoelectric cooler [4] is located at the bottom of the electrostatic chuck [2], the cold junction insulating heat conducting plate [302] of refrigerator is contacted with the bottom of the electrostatic chuck [2]; the mask plate [1] is attached to the top of the electrostatic chuck [2] via electrostatic absorption force. The array thermoelectric cooler [4] is constructed by several concentric square thermoelectric cooling areas from center to outer, each of the cooling areas canbe divided to several thermoelectric cooler units [3], every thermoelectric cooler unit [3] is constructed by concatenation connection of pyod couple [400] with m row, n line; the pyod couple [400] is formed by connection of a n type semi-conductor and a p type semi-conductor. The pyod couples [400] in the same thermoelectric cooler unit [3] are series-feed, the current is identical, and the temperature of the cold junction is identical. The invention is at precondition of confirmation of voltage, material, resistance and hot junction temperature, the cold junction temperature and refrigerating capacity of the array thermoelectric cooler unit can be controlled just by controlling the input current.
Owner:INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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