272results about How to "Guaranteed Surface Accuracy" patented technology

The invention discloses a technique for improving the mechanical performance of a printed piece through shock processing in the process of metal part 3D printing. The technique is characterized in that shock processing is conducted on the upper surfaces of cladding layers after a certain number of layers are cladded, so that defects such as cavities, looseness and microcracks in the cladding layers are eliminated, and the density of a formed part is improved; in the shock processing process, heating and reasonable partitioned technology planning are conducted on the cladding layers, the shock processing angle can be changed according to different areas on the same layer and the change of the number of the layers, and therefore it is guaranteed that the density and the mechanical performance are improved, stress concentration is prevented, and the forming precision of the metal 3D printed part is ensured.

A vibrating mirror comprises a moving mirror configured to deflect a light beam, a torsion bar coupled to the moving mirror and defining a rotational axis of the moving mirror, and a mirror driving part configured to produce a rotational force for causing the moving mirror to oscillate, wherein the torsion bar is coupled to the moving mirror at connecting positions offset from the rotational axis by a distance r/2 in opposite directions so as to satisfy r>A/6, where A is the width of the moving mirror perpendicular to the rotational axis.

The invention relates to the technology field of communication and observation control, which provides a composite material satellite antenna reflection plane and the method for preparation. The composite material satellite antenna reflection plane adopts 3D glass fiber felt as core material, and adopts carbon fiber composite as covering sandwich type composite material satellite antenna reflection plane. Compared with the prior art, the invention has the following advantages: 1. shaped surface accuracy of the satellite antenna reflection plane is high and satellite signal gain is great, 2. quality of the reflection plane is light, and is fit for transportation, in particular to fitting for vehicle satellite antenna and portable satellite antenna, 3. integrality of the reflection plane is good, hardness is great, thereby being capable of preferably retaining the shaped surface accuracy and bearing more wind load and impact load, 4. adopting the 3D glass fiber felt as the core material, the invention inaugurates a new technology of the sandwich composite material satellite antenna reflection plane, the technology is capable of producing heavy caliber satellite antenna reflection plane, and which is simple in manufacturing technology comparatively and low in the cost.

The invention discloses an ultrasonic vibration auxiliary grinding method of an ultrahard linear microstructural surface, which relates to an ultrasonic vibration auxiliary grinding method, and is used for solving the problem that the surface flatness on the microstructural surface is damaged caused by the reason that the vibration track is interfered with the microstructural surface structure when the microstructural surface is processed by the existing ultrasonic vibration auxiliary grinding method. The method comprises the following steps: applying one-dimensional ultrasonic vibration to a vibration working table by an ultrasonic generator; when a parallel linear microstructural surface, namely a V-shaped groove matrix surface or a grating microstructural surface is ground, adjusting the vibration direction of the one-dimensional ultrasonic vibration table to be parallel to a grinding wheel feeding direction by utilizing a rotary platform; controlling the grinding wheel cutting direction to be opposite to the grinding wheel feeding direction; controlling the ultrasonic vibration frequency of the ultrasonic generator to be 25-35kHz, the ultrasonic vibration amplitude to be 1-10 mu m, the grinding wheel rotary speed to be 2000-4000rpm, and the workpiece feeding speed to be 0.2-2mm/min. The method provided by the invention is used for precisely processing the ultrahard microstructural surface.

The invention discloses an additive and subtractive manufacturing based metal part repair method. The additive and subtractive manufacturing based metal part repair method is used for solving the technical problem of the low material utilization rate of an existing metal part repair method. According to the technical scheme, firstly, after to-be-repaired model three-dimensional data are obtained through three-dimensional scanning, subtractive machining is carried out on the worn part of a part, that is, the part is worn through dry high-speed cutting, and a regular surface is obtained; and then additive manufacturing is carried out through an electron beam fuse wire additive process, the deposition additive repair process of the part is completed, meanwhile, the part surface is machined through dry high-speed cutting machining, and a repair part with high surface quality is obtained. According to the additive and subtractive manufacturing based metal part repair method, error accumulation brought by workpiece clamping, taking and placing during original multi-platform machining is avoided, meanwhile, the interference problem happening in the subtractive process of parts of complex structures is solved, and the mechanical performance of the damaged part achieves the level of normal parts. According to the method, the repair process is carried out in a vacuum environment, workpiece clamping only needs to be carried out once, and the material utilization rate is high.

The invention relates to an ultrasonic vibration auxiliary grinding device for minutely processing the surface of a micro-structure. By the ultrasonic vibration auxiliary grinding device, the problem that a vibration trace interferes with a surface structure during processing of the surface of an ultrahard material micro-structure because the conventional ultrasonic vibration auxiliary grinding device cannot adjust a vibration direction and then the surface flatness of the surface of the micro-structure is broken can be solved. The lower end face of a rotary table is fixed on the upper end face of an inclined table; a supporting base plate is fixed on the upper end face of the rotary table; a vibration working table is fixed above the supporting base plate through four supporting pieces; the area of one end face of an amplitude-variable rod is small, and the area of the other end face of the amplitude-variable rod is large; the small-area end of the amplitude-variable rod is fixedly connected with the side wall of the vibration working table, and the large-area end of the amplitude-variable rod is fixedly connected with an energy transducer; and the energy transducer is connected with an ultrasonic generator through a lead wire. In the invention, the ultrasonic vibration direction can be adjusted randomly by adjusting the rotary table and the inclined table, so the normal grinding rigidity is improved; and the ultrasonic vibration auxiliary grinding device is used for minutely processing the surfaces of ceramic ultrahard micro-structures.

The invention relates to a liquid die forging and rolling compound formation method for a GH4033 high-temperature alloy irregular-section large ring piece. The method comprises the following steps of: 1) smelting; 2) performing liquid die forging, namely fixing a liquid die forging mold on an indirect extrusion casting machine, pouring a quantitative amount of alloy solution into the liquid die forging mold at the pouring temperature of between 1350 and 1450 DEG C, pressurizing at the speed of 40 to 50 mm/s, filling for 1 to 6 seconds at the specific pressure of 300 to 400 MPa, keeping the pressure for 50 to 90 seconds, and thus obtaining a similarly final section ring blank; 3) homogenizing; 4) performing afterheat isothermal rolling, namely cooling the homogenized similarly final section ring blank to the temperature of between 1100 and 1140 DEG C, and performing afterheat isothermal rolling on a radial shaft compound ring rolling machine; 5) performing thermal treatment, namely performing solid solution instant thermal treatment, keeping the ring blank at the temperature of between 900 and 1000 DEG C for 1 to 2 hours, performing air cooling, then heating to the temperature of 1080 DEG C, keeping the temperature for 8 hours, performing air cooling to the temperature of 750 DEG C, keeping the temperature for 16 hours, and performing air cooling; and 6) finishing.

The invention discloses a method for machining a titanium alloy hollow light-weight airfoil and relates to the technical field of welding. The method for machining the titanium alloy hollow light-weight airfoil aims at achieving the effects that the wall thickness of each core lattice of the hollow light-weight airfoil is small, the height of each core lattice of the hollow light-weight airfoil islarge, production efficiency of products can be improved, and manufacturing cost can be lowered. The method for machining the titanium alloy hollow light-weight airfoil comprises the steps of 1, conducting airfoil structure design, wherein the airfoil comprises skin, the internal core lattices and a frame, the internal core lattices comprise rib plates and connecting ribs, the rib plates are in cross connection, and each connecting rib connects the two corresponding crossing rib plates; 2, conducting material preparation, and conducting cutting and cleaning treatment on the skin, the rib plates, the connecting ribs and the frame; 3, conducting laser welding, wherein firstly, laser welding is conducted on the frame and the internal core lattices, so that a framework is formed, and secondly, laser welding is conducted on the skin and the frame; and 4, conducting thermal shaping, wherein after welding is completed, a workpiece is put into a shaping tool.

An embodiment of the invention provides a skirt plate structure of a rail traffic vehicle body and a forming method of the skirt plate structure, and belongs to the technical field of composite structure forming. The skirt plate structure of the rail traffic vehicle body comprises an outer skin layer, a honeycomb core layer, an inner skin layer and a support frame, wherein upper and lower surfacesof the honeycomb core layer are connected with the outer skin layer and the inner skin layer respectively, a mounting groove is formed in the inner skin layer and the honeycomb core layer, the support frame is located in the mounting groove and connected with the outer skin layer, the outer skin layer and the inner skin layer are made of a composite material, and the support frame is made of a metal material or a composite material. The skin layers are made of the composite material, uniform radian of the inner and outer skin layers is realized by the honeycomb core, and surface precision ofthe large curved skirt plate structure is guaranteed; mechanical strength of the large skirt plate structure is guaranteed by the support frame; with adoption of the composite materials and a hollow structure, the weight of the large skirt plate structure is reduced by about 20%, and the requirement for the light vehicle body is met.

The invention relates to the field of precision casting of high-temperature alloy vacuum furnaces, in particular to a method for preparing a modified ceramic mold shell through special-shaped cross section short carbon fibers. The mold shell is a compound shell and comprises a surface layer and a back layer modified by adding the special-shaped cross section short carbon fibers. The method comprises the preparation steps that surface layer slurry and back layer slurry are prepared correspondingly; the short carbon fibers which are evenly scattered in advance are added into the back layer slurry; the surface layer is coated with the surface layer slurry, the back layer is coated with the back layer slurry, and sand is sprayed to the surface layer and the back layer; the slurry coating and sand spraying operations are conducted repeatedly till a preset number of layers is met; the surface layer slurry is used for slurry sealing, and the mold shell is dewaxed; and the mold shell is cooled in a furnace after being roasted. According to the mold shell prepared through the method, the fibers are scattered evenly and are not likely to be pulled out and lose efficacy, the strength of the mold shell is improved, the thickness of the mold shell is reduced, the heat dissipation performance of the mold shell is enhanced, the performance requirements for thin walls and high strength are met, and the yield of single-crystal blades is increased.

The invention provides a molding method of an aramid fiber composite material frequency selection surface reflector. The problems of profile accuracy control of the aramid fiber composite material frequency selection surface reflector and molding of a surface metal array are mainly solved by adopting a multi-step molding method, thermal cycle ageing and room-temperature aging treatment on a solidified reflector, a method of bonding a copper-coated polyimide membrane on the surface of a reflector substrate by using an adhesive film through a procured NOMEX honeycomb core and a reflector at a 'B' stage.

The invention discloses a process for manufacturing a high-strength aluminum alloy plate, which comprises eleven steps of batching, smelting, checking, standing, casting, sawing and face milling, heat treatment, hot rolling, quenching, ageing and finished product shearing in turn. The manufacturing process radically changes the common phenomena of high energy consumption and high pollution in the conventional smelting furnace, meets the requirements of energy conservation and environmental protection, and the cast aluminum alloy plate has high mechanical property and good machining quality, and meanwhile the finished product rate and the production efficiency are effectively improved.

The invention discloses a mounting tool for a spring ring. The mounting tool comprises a guiding body and a pushing sleeve, wherein the guiding body has a shape of circular platform; the pushing sleeve is in clearance fit with the guiding body; an inner diameter of the pushing sleeve is slightly more than a maximum diameter of the guiding body and is less than an outer diameter of a mounted spring ring; a minimum diameter of the guiding body is less than an inner diameter of the mounted spring ring; the guiding body is a circular platform at a small conical degree; the maximum diameter of the guiding body is slightly more than the diameter of an axle of the mounted spring ring; a connecting threaded pillar is arranged on an end face of a maximum-diameter end of the guiding body; and the threaded pillar is coaxial with the guiding body. The mounting tool for the spring ring has a simple structure, is portable and conveniently used, is capable of flexibly moving and can be used for mounting the spring ring. Under the guidance of the guiding body, the spring ring is uniformly expanded, thereby avoiding a situation of serious local deformation of the spring ring caused by an unevenly pressed local part, ensuring the precision of the outer surface of the axle of the mounted spring ring, and improving the service life of the spring ring and assembling efficiency.

The invention discloses an ultra-precision machining device and method for an off-axis thin-wall aspherical optical element. The method includes the steps that first, the optical element is arranged in a wedge angle tool, the bottom plane of the optical element is attached to the top face of a groove of the wedge angle tool, and the aspherical face of the optical element is made to be leveled up; second, a through hole of the optical element is padded with a spacer; third, a washer is installed between the outer circle wall of the optical element and the top face of the wedge angle tool; fourth, the optical element, the spacer and the washer are synchronously milled and ground through a milling and grinding machine, and then the aspherical face of the optical element is milled and ground; fifth, the aspherical face, the spacer and the washer on the outer circle of the optical element are polished through a polishing machine. According to the method, the off-axis thin-wall aspherical optical element is precisely machined by ingeniously utilizing the wedge angle tool, the spacer and the washer, and thus the problem that the off-axis thin-wall aspherical optical element is hard to machine is solved.

The invention relates to a lens installing and positioning device in a cold optical technology, and relates to the field of low-temperature infrared. The lens installing and positioning device comprises a main lens cone, two lenses, a tetrafluoroethylene cushion, fine-thread adjusting screws, a mirror spacer ring, a lens pressing ring, pressure springs, pressing screws and a pressing cover. The first lens is positioned through cooperation of an oblique face at the front end of the main lens cone and an oblique face of the first lens, optical spacing between the first lens and the second lens is guaranteed through the mirror spacer ring, the mirror spacer ring is in oblique face fit with the two lenses, the second lens is pressed through the lens pressing ring, pressing force between the second lens and the lens pressing ring is realized through the pressure springs, connection between the pressing screws and the main lens cone is used for adjusting the pressing force, and the pressing cover plays a protective role. The lens installing and positioning device solves the problem of lens installing and fixing within a large temperature change range, can adapt to thermal deformation of the lenses and a supporting structure thereof within a large temperature change range, and guarantees that the lenses are not damaged irrecoverably while surface shape precision of lens surfaces is guaranteed.

The invention relates to a transmission optical component damage threshold improvement method based on multi-iteration etching technology. The method comprises a step of using a high concentration hydrofluoric acid solution to carry out rapid etching of an optical element with an etching depth d1, a step of using an annular polishing machine to carry out rapid polishing on the optical element with a polishing removal depth d2, a step of baking the optical element in high temperature of 300 degrees and then using an ion source to carry out bombardment etching on the surface of the optical element with an etching depth d3, a step of carrying out low speed polishing processing with an polishing removal depth d4, and a step of using the ion source to carry out bombardment etching on the surface of the optical element again with an etching depth d5. Compared with the prior art, the method has the advantages of strong pertinence and good repeatability, through the multi-iteration etching, especially the successive decreasing removal depth and removal rate are employed, and the damage threshold of a transmission type optical element can be greatly enhanced.

A primary mirror flexible support mechanism relates to a primary mirror flexible support mechanism. The mechanism is provided to solve the problem of the existing primary mirror support mechanism, namely, the existing mechanism cannot isolate outside temperature change and has alignment error, the axial support component mechanism and the radial support mechanism interfere with each other as the pitch angle changes, and thus, the surface shape of the primary mirror is affected. The primary mirror flexible support mechanism comprises a support base, an axial support component supporting a primary mirror, a tensile component glued onto the back of the primary mirror, a radial support component glued to the center of the primary mirror, and a protective component. The radial support component comprises a flexible mandrel adhered into the center hole of the primary mirror, a center cylinder installed in the middle of the support base through spigot fitting, and a flexible diaphragm arranged between the center cylinder and the flexible mandrel. The protective component comprises an O-shaped rubber ring and a protective ring. The problem that the primary mirror may be broken due to overturn after failure of the axial support is prevented. The protective device ensures that the primary mirror can be protected under certain amplitude of vibration.

A method for compensating the radial error of precise and ultraprecise grinding abrasion wheels and an application of the method for compensating the radial error of the precise and ultraprecise grinding abrasion wheels belong to the technical field of precise and ultraprecise processing and aim to solve the problem which is caused by radial error and radial run-out in the prior art. The method comprises the following steps: the radius of the abrasion wheel is determined through a multi-measurement method; a central path of an abrasion wheel grinding process is determined according to the determined radius of the abrasion wheel; and the abrasion wheel with the determined abrasion wheel radius in the step 1 is ground along the central path of the determined abrasion wheel in the step 2. According to the method, the edge points of the abrasion wheel are randomly selected to determine a plurality of circle centers of the abrasion wheel so as to determine the radium of the abrasion wheel, so that the radius of the abrasion wheel is corrected, the surface precision of a processed element is ensured, and the processing precision is increased; and according to the method for compensating the radial error, edge point coordinates are determined when the abrasion wheel rotates at high speed, the distribution of circle center points is integrated to determine the radial run-out of the abrasion wheel to a certain extent, and the compensating process is further corrected.

The invention belongs to the technical field of aeronautical manufacturing and particularly relates to a forming mould for a composite material part of a box type closed-angle structure. In the present, composite material forming moulds include metal moulds, composite material moulds, rubber moulds, foam moulds, plaster moulds and soluble polymer moulds. Traditional composite material parts of irregular-shaped structures can be manufactured and formed by rubber shrinkage moulds, foam and plaster, and then the moulds are broken to obtain the parts. However, the moulds can only be used for once or several time and is not suitable for batch production, and the surface accuracy and the quality of the composite material parts manufactured by the moulds are not as good as the surface accuracy and the quality of the composite material parts manufactured by metal moulds totally. The forming mould for the composite material part of the box type closed-angle structure is reasonable in design and simple to manufacture and also solves the problem of demoulding of the composite material part of the box type closed-angle structure.

The invention discloses a laser impact wave polishing device with micro grooves in a contact film. The device is characterized by structurally comprising high energy pulse laser, a restraint layer, laser waves, an absorbing layer and a rigid contact film with micro grooves. A specific process is as follows: high energy pulse laser is irradiated onto the absorbing layer through the restraint layer,and the absorbing layer quickly vaporizes to generate plasma explosion and induce high-pressure impact waves; under action of the impact waves, the rigid contact film with micro grooves grind micro bulges; the micro grooves are formed in the contact film, so that the contact film has good softness, and fits to a curved surface easier; and in a polishing process, surface roughness of a polishing area is guaranteed to be consistent; meanwhile, in the presence of the micro grooves, the bottom of the contact film can be stored to the original shape after being acted by laser impact waves, so thatsurface precision after a workpiece surface is polished during large-area polishing can be guaranteed, and the contact film can be repeatedly used. The laser impact wave polishing device can be applied to polishing treatment of a large-area free curved surface of a metal surface.

A hemispherical harmonic oscillator flow channel constraint-shear rheological polishing method comprises the following steps that (1) a non-Newtonian fluid polishing solution with the shear rheological effect is prepared and added into a polishing solution station; (2) a hemispherical harmonic oscillator is connected to a polishing machine workpiece spindle through a clamp, and the rotation axis of the hemispherical harmonic oscillator is adjusted to be coaxial with the rotation axis of the workpiece spindle; (3) the spherical surface of a polishing head is adjusted to be concentric with the spherical surface of the hemispherical harmonic oscillator, and a polishing solution circulating system is started; and (4) the workpiece spindle is started, the polishing head rotates relative to thehemispherical harmonic oscillator, the polishing solution forms two shear rheological flow fields in gaps between a constraint flow channel and the surface of the polishing head-harmonic oscillator, and efficient polishing of the hemispherical harmonic oscillator is achieved by controlling the flow speed of the polishing solution and the rotating speed of the workpiece spindle. A hemispherical harmonic oscillator flow channel constraint-shear rheological polishing device is provided. By means of the hemispherical harmonic oscillator flow channel constraint-shear rheological polishing method and device, on the premise that the grinding surface shape precision of the hemispherical harmonic oscillator is kept, a damage layer on the grinding surface can be efficiently removed, and efficient and high-quality polishing is achieved.

The invention discloses a modularized micro-nano satellite platform, which is composed of a set of replaceable basic components matched with each other, including a laminated frame, an adapter frame, a screw and a tension plate, at least one laminated frame is stacked and fixed on the rotary The top of the frame is connected in series with the integrated satellite platform body through screws. Each layer of stack frame and adapter frame has a unified standard mechanical interface. The tension plates are distributed on the side of the satellite platform body and fixedly connected to the adapter frame and each layer. layer frame. The invention has a standard mechanical interface, is easy to change the design, is simple to assemble, and is suitable for mass production and mass launch.

The invention provides a transmission electron microscope in-situ nano indentation method for micron alloy containing isometric single nano-twin crystal, and belongs to the field of transmission electron microscope in-situ mechanical testing f nano-twin crystal. A macro-micro-nano integrated diamond tool is used, each tip has a curvature radius of 40-90 nm and a height of 100-300 Mu m; the tips are arrayed and are distributed on the surface of the tool. The diamond tool is used to indent the surface of the alloy; the indented surface is processed by chemical mechanical polishing; the polishedalloy has surface roughness Ra of 0.5-0.9 nm. A scanning electron microscope with focusing ion beams is used to perform in-situ cutting, splicing, transporting and ion thinning, and a sample has a length of 5-20 Mu m, a height of 4-10 Mu m and a thickness of 50-100 nm. A displacement control mode is used, maximum displacement is 200-1000 nm, and loading speed is 10-30 nm/s. The transmission electron microscope in-situ nano indentation method for single nano-twin crystal is achieved herein.