755results about How to "Small thermal deformation" patented technology

The present invention is a cooling plate including a groove, which becomes a passage of a coolant, inside a body, wherein one or more fins are provided inside the groove, wherein the groove is covered with a lid having width larger than the groove, wherein the lid is joined to the body by friction stir welding, and wherein a weld bead formed by the joining is outside the passage, and the weld bead formed by the joining is formed within the body and further, is characterized by a manufacturing method of a cooling plate that has a first groove, which becomes a passage of a coolant, and a second groove, which has width larger than the first groove and receives a lid on the first groove, inside a body, receives the lid on the second groove, and is joined to the body, the manufacturing method of a cooling plate wherein, while the lid and the body are joined together by the friction stir welding owing to insertion of a rotation tool having a shoulder and a pin, the joining is performed so that a weld bead formed by the joining may become out of the passage, and furthermore, is characterized in that a target for sputtering is joined to the cooling plate.

A plane wing titanium alloy thin-wall web efficient numerical control machining technology comprises the following steps that (1) blanking is carried out; (2) web outer contour machining is carried out, and an ear piece for locating is machined; (3) a web is clamped, and a cavity on the front face of the web is machined; (4) a web side wall is machined; (5) web quick converting is carried out, and a cavity on the back face of the web is machined; (6) the locating ear piece is removed by milling; and (7) quality testing is carried out. The rigidity of a machining technology system is improved, unstressed machining is achieved, by optimized design of a feed track, the stability of a machining process is improved, machining speed is increased, titanium alloy shallow cutting large feeding milling technology parameters are used, heat deforming during machining is lowered, rectifying processes are omitted, the metal removing rate is improved by 30%-50%, finally, machining efficiency is obviously improved, the clamping time of workpieces is obviously shortened through a quick-reloading technology, the repeated locating accuracy of clamping is guaranteed, and accordingly numerically-controlled machine tool machining efficiency is greatly improved.

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.

The invention discloses high-entropy alloy powder for laser cladding and a preparation method of a cladding layer. The high-entropy alloy powder comprises Ti, Zr, V, Nb, Ta and Mo. In addition, high-entropy alloy powder which comprises Ti, Zr, V, Nb, Ta, Mo and W, high-entropy alloy powder which comprises Ti, Zr, V, Nb, Ta, Mo, W and Cr and the preparation method of the cladding layer of the high-entropy alloy powder for laser cladding are provided. The high-entropy alloy powder mainly comprises two characteristics, namely, the high-entropy effect and the cocktail effect, each kind of powder exerts respective advantages, and therefore the cladding layer with high hardness, high corrosion resistance, excellent tempering softening resisting performance and excellent structure performance is obtained. Metallurgical bonding is formed by an alloy layer and a matrix through laser cladding; the bonding strength of the cladding layer and the matrix is greatly improved, and the heating speed is high; metal of the cladding layer is not prone to being diluted by the matrix; little heat deformation is generated; and therefore the part rejection rate is low.

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.

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.

The invention discloses a laser seal welding technique for a 3A21 aluminum alloy casing. The laser seal welding technique comprises the following steps of visual alignment, laser spot welding location and laser seal welding. The technological parameters of the laser seal welding are that the laser pulse peak power is 3000W-3500W, the impulse waveform is preheating thermal-insulation wave, the pulse width is 4ms-8ms, the pulse repetition frequency is 10Hz-20Hz, the welding speed is 108mm / min-180mm / min, and the defocusing amount is -1mm to -2mm. The laser seal welding technique for the 3A21 aluminum alloy casing can effectively remove cracks and air holes on welding seams of laser welding of the 3A21 aluminum alloy casing. The sealed 3A21 aluminum alloy casing has the beneficial effects of being attractive in welding seam appearance, high in air tightness, high in reliability, high in efficiency and low in cost.

The invention discloses a scissor type lift and a lifting device thereof. The lifting device comprises a protective supporting plate, a lock, a bumper, a head shaft and at least two parallel engine-driven telescopic devices, wherein each engine-driven telescopic device comprises a telescopic rod at one end thereof respectively; the head shaft is pivoted with tail ends of telescopic rods of the at least two parallel engine-driven telescopic devices respectively; the two ends of the protective supporting plate are fixed to the at least two parallel engine-driven telescopic devices respectively; the lock is arranged on the protective supporting plate between the two engine-driven telescopic devices; one end of the bumper is pivoted with the head shaft; the rod is close to the lock and is provided with a plurality of notches distributed along the axial direction; and the notches and the lock forms a self-locked structure locked in one way. The scissor type lift and the lifting device thereof of the invention can ensure the safety of the lifting operation, reduce the height difference between two platforms of the scissor type lift and meet the standard requirement.

The invention belongs to the technical field of high-molecular composite materials, and relates to a long glassfiber reinforced nylon composite material and a preparation method thereof. The composite material is prepared from the following components in parts by weight: 100 parts of nylon, 2 to 10 parts of compatilizer, 0.1 to 0.5 part of antioxidant, 0.2 to 1.0 part of lubricant and 10 to 40 parts of glassfibers. Compared with the short glassfiber reinforcement mode, according to the composite material provided by the invention, abrasions among short glassfibers, a screw rod and a feed cylinder are decreased during a double-screw extruding process, namely, the minimum fiber retained in an injection-molding product is large in length, so that the glassfiber reinforced nylon composite material with excellent performance is prepared. Thus, the applications of the glassfiber reinforced nylon composite material in the fields of automobiles, electric appliances, machinery, military industry and the like are enlarged.

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.

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.

A structure member is used wherein a circuit board is connected to a solid-state image pickup element and placed between a portion of the structure member to which the solid-state image pickup element is attached, and another portion to which a light-transmitting member is attached, and the circuit board is sealed integrally into the structure member. The solid-state image pickup element is attached to a through-opening portion 1C, and a light-transmitting member is attached so as to cover the through-opening portion 1C with being separated from the solid-state image pickup element by a predetermined distance. In a process of molding the structure member, the circuit board is integrally molded, whereby the manpower can be reduced, and the structures of the attaching portions can be simplified to miniaturize the device.

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.

The invention discloses a 150 DEG C irradiation crosslinking low-smoke non-halogen flame-retardant cable material which is prepared by the following raw materials in parts by mass: 60-90 parts of ethylene-vinyl acetate copolymer, 10-30 parts of LLDPE (linear low density polyethylene), 100-150 parts of inorganic filler, 1-3 parts of surface conditioning agent, 0.5-1 part of anti-oxidant, 2-5 parts of anti-aging agent, and 2-4 parts of processing aid. The cable material is manufactured through procedures of raw material mixing, plastication and granulation, and has the advantages of excellent heat-resistant quality (the temperature resisting grade is 150 DEG C), better mechanical property, flame resistance and electric performance, small thermal deformation, low smoke, low toxicity, and environmental protection.

The invention provides a technique for repairing an oil electric engine cylinder sleeve for ship, which is characterized in that the invention comprises the following working procedures: 1 detecting and cleaning the cylinder sleeve: carrying out a jump detection and a dimension detection on the cylinder sleeve on a lathe, confirming a hurt part, carrying out mechanical cleaning on the machine type of the hurt part and carrying out detection of removing a surface fatigue layer; 2 laser cladding repairing on the hurt part: the parameters during an operation process are: a laser power of 6200 to 8000W, a facula diameter of 2 to 6mm and a facula moving speed of 100 to 150mm / s; 3 machinery processing to resume the shape of the cylinder sleeve: carrying out machinery processing to resume the original designed dimension state on a boring lathe and a boring lathe. The technique for repairing an oil electric engine cylinder sleeve for ship provided by the invention has the advantages of high suitability, simple and convenient operation, small temperature distortion, uniform welding structure, realizing automatic operation with little residual stress; the invention requires no restoration heat treatment.

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.

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.

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.

This invention provides an infrared reflective layered product, particularly a back sheet for solar cells, which, even when it has a black colored or chromatically colored appearance, can reflect infrared radiation with certain wavelengths to prevent heat accumulation and, at the same time, has excellent heat resistance. The infrared reflective layered product comprises the following layer (B) as a base layer, the following layer (A) layered on one side of the layer (B), and the following layer (C) layered on the other side of the layer (B).Layer (A): a colored resin layer which has an absorptance of a light with a wavelength of 800-1400 nm of not more than 10%.Layer (B): a thermoplastic resin layer which shows a dimensional change (s) satisfying 1%≧s≧−1% when left at 150° C. for 30 minutes.Layer C: a colored resin layer having a reflectance of a light with a wavelength of 400-1400 nm of not less than 50%.Preferably, the layer (A) is formed of a resin containing an infrared transmittable coloring agent, and the layer (C) is formed of a resin containing a white pigment. A water vapor barrier layer (D) may be additionally provided.

The invention provides a turning method. The method comprises the following step: turning the outer surface of a niobium alloy target material or a niobium alloy target material by adopting a turning tool, wherein the front angle of the turning tool is 20-40 degrees, the rear angle is 4-15 degrees, the main deflection angle is 45-60 degrees, the auxiliary deflection angle is 45-90 degrees, and the blade inclination angle is 10-25 degrees. By selecting the front angle, rear angle, main deflection angle, auxiliary deflection angle and blade inclination angle of the turning tool, cuttings can be discharged from processed surfaces, so that the cuttings are prevented from sticking to the tool, and the cutting difficulty is lowered. The invention further provides a turning tool. The front angle of the turning tool is 20-40 degrees, the rear angle is 4-15 degrees, the main deflection angle is 45-60 degrees, the auxiliary deflection angle is 45-90 degrees, and the blade inclination angle is 10-25 degrees.

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.

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.

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.

A method for measuring horizontal stress of fine granulated saturation soil at original place in real time calculates out degree U of consolidation and horizontal consolidation coefficient C as well as static side pressure coefficient K by obtaining relation curve of horizontal pressure R at saturation soil layer deep position to time T and by applying three ¿C points calculation means to calculate horizontal stress R1 at initial time and horizontal stress at time of finalizing excess pore water pressure evanish . The probe for realizing said method is also disclosed.

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.

The invention provides a method of processing impellers on a five-axis machining center and relates to the field of machining, and particularly relates to the method of processing the impellers on the five-axis machining center. The method comprises following steps: (1) clamping positioning with a mandrel: processing a key groove on a workblank for assistant positioning and performing the clamping positioning being suitable for the mandrel; and (2) alignment of a workpiece with a dial indicator: calculating the coordinate system of the workpiece, installing a mounting rod of the dial indicator on a cutter handle and moving a workbench to move the central line of a main shaft approximately to the center of the workpiece. By mean of the method, clamping times can be reduced and positioning precision is ensured, and meanwhile the surface roughness of the impellers can be increased. By means of high-speed milling, the cutting force and the cutting zone temperature are effectively reduced, thereby reducing thermo-deformation of the impellers. The method can not only increase processing efficiency but also increasing processing quality and precision, and can enhance the strength and the rigidity of the impellers.

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.

The invention discloses a non-gas metal arc welding 3 D adding material repair device and repair method. The repair device comprises a controller, a four-axis linkage platform, a laser vision sensor, an infrared vision sensor, a clamp, a non-metal arc welding torch, a wire feeding unit and a welding wire disc. The repair method comprises the steps that a defective workpiece is installed on a repair workbench; the laser vision sensor is driven to scan a defective three-dimensional outline; the controller rebuilds the defective three-dimensional outline; specific welding parameters are determined; the controller drives the infrared vision sensor to scan a molten pool, time-frequency parameters of a molten pool image are obtained, a compensation control code is generated according to the time-frequency parameters of the molten pool image, and the set welding parameters are corrected in real time; and after repair, the laser vision sensor is driven again to scan the defective three-dimensional outline, whether the repaired workpiece reaches the standard is determined, and if not, defects are repaired again till defect repair reaches the standard. The repair device is simple in structure, convenient to operate and high in reliability and adaptability.