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1836results about How to "Improve manufacturing precision" patented technology

Coaxial powder feeding system for quickly molding and producing functional gradient material with laser

The invention relates to a coaxial powder feeding system of laser rapid prototyping preparation function gradient material, comprising a powder inlet device, and the powder is absorbed and conveyed by carrier gas. The powder inlet device is communicated with a powder mixer through a first conveying pipe. The powder mixer is used for mixing the powder which has been conveyed. The mixed powder enters into a powder separate device through a second conveying pie. The powder separate device is used for separating the mixed powder into multi-path. The powder separate device is communicated with the powder inlet of a nozzle through a third conveying pipe. The nozzle makes the multi-path powder flock together in a molten pool formed by laser. The function gradient material is prepared under the cladding action of laser and powder. The mix of the powder is uniform. The coaxial powder feeding system has good power feeding property, which can realize the optimum processing, and at the same time, can be suitable for different processing distances. The powder utilization rate is high. The manufacturing accuracy is good. At the same time, the powder conveying distance can be adjusted with a certain scope, and so the coaxial powder feeding system can not be limited to the manufacturing space.
Owner:SHENYANG INST OF AUTOMATION - CHINESE ACAD OF SCI

Integrated steel pipe and flange splicing and machining machine and machining process thereof

InactiveCN102729045ALarge amount of welding depositionImprove welding speed and qualityArc welding apparatusOther manufacturing equipments/toolsSteel tubeMachining process
The invention discloses an integrated steel pipe and flange splicing and machining machine and a machining process thereof and aims to provide an integrated steel pipe and flange splicing and machining machine which can improve the manufacturing precision and the production efficiency and reduce the labor intensity and is high in steel pipe and flange welding quality and a machining process of the machine. The integrated steel pipe and flange splicing and machining machine comprises a working platform, and a supporting bracket which is arranged on the working platform and is used for supporting a steel pipe, wherein one end of the working platform is provided with a first welding device; a first guide rail which extends to the other end of the working platform is arranged on the top of the working platform; a first mounting plate is arranged on the first guide rail in a sliding mode; a second welding device is arranged on the first mounting plate; and flange fixing templates are arranged on the first welding device and the second welding device. The machining process comprises the following steps of: lifting the steel pipe to the supporting bracket, and fixing the flange to a flange fixing template; and welding annular gaps of the inner and outer side faces of the steel pipe and the flange through the first welding device and the second welding device.
Owner:戴刚平

Double-turntable five-axis numerical control machine tool virtual assembling and numerical control machining simulation method

The invention discloses a double-turntable five-axis numerical control machine tool virtual assembling and numerical control machining simulation method and provides a simulation method capable of improving simulation efficiency under the premise of guaranteeing simulation correctness. The method includes: modeling; conducting three-dimensional modeling of blanks and clamps required in all moving components, a machine tool body and numerical control machining; connecting all moving components and the machine tool body to conduct virtual assembling according to a moving relation by using a Pro/E three-dimensional platform; operating a virtual simulating machine tool; outputting models of all components in a standard template library (STL) form on the basis of the same coordinate system; establishing a double-turntable five-axis numerical control machine tool virtual model; establishing a model tree in VERICUT, and the sequence of model components includes two branches: machine tool body Base - Y axis - X axis - A axis - C axis - clamp - blank and machine tool body Base - Z axis - main axis - tool; the STL assembly model output by Pro/E is led into corresponding components in VERICUT directly, namely the double-turntable five-axis numerical control machine tool virtual model is established; and numerical control machining simulation is operated.
Owner:TIANJIN UNIV OF COMMERCE

Aeroplane buffet air tunnel model integration design and manufacturing method

The invention relates to an integrated design and manufacture method of a full resin airplane low-velocity flutter wind tunnel model based on photocuring rapid prototyping. The method first conducts the integrated design of the flutter model according to the actual structure of an airplane, the requirement of a wind tunnel experiment and the parameters of photocuring resin material and based on the photocuring resin material, and makes the full resin flutter model in an integrated way on the basis of the optimization of the photocuring rapid process. The method proposes a new design and manufacture concept of the flutter model of low modulus material, gets rid of unnecessary assembly links by the use of the advantages of accuracy, quickness and low cost of the photocuring rapid prototyping technology, the uniformity of the model material, the low modulus of the resin material and isotropy characteristic, and designs and manufactures the full resin flutter wind tunnel model meeting the full dynamic similarity. The method overcomes the defects of traditional technologies, improves the manufacture precision of the wind tunnel model, reduces cost, shortens the period and realizes structural similarity, thus boosting the development speed of an airplane.
Owner:XI AN JIAOTONG UNIV

Ultra-precise processing integrated platform for large caliber optical mirror surface

ActiveCN102756316AEasy to moveAchieve multi-axis ultra-precision grindingOptical surface grinding machinesOptical processingSurface grinding
An ultra-precise processing integrated platform for a large caliber optical mirror surface solves the problem that processing and detection are not integrated while processing the large caliber optical mirror surface in the conventional optical processing technical field. The platform integrates grinding, detection and milling for processing the large caliber optical mirror surface, and comprises a base, a horizontal moving device, a rotation device, an ultra-precise grinding device, a mirror surface detection device and a milling device, wherein the horizontal moving device drives the rotation device to move to a workpiece mounting position, a grinding position, a surface shape detection position and a milling position in a horizontal direction; a vertical moving device drives a spindle system and a diamond grinding wheel to move up and down in a vertical direction; the spindle system can adjust the inclined angle of the diamond grinding wheel; the diamond grinding wheel has a cambered surface; when in the workpiece mounting position, the rotation device can conduct cambered surface grinding on a workpiece; when in the surface shape detection position, the rotation device can conduct surface shape detection on the workpiece; when in the surface shape detection position, the rotation device can mill the workpiece.
Owner:SHANGHAI JIAO TONG UNIV

Truss combined beam and upper and layer connected light steel structure and construction method thereof

InactiveCN102359180ATroubleshoot simultaneous connectionsSolve the shortcomings that the pressure is not easy to meet the force requirementsGirdersJoistsRear quarterKeel
The invention discloses a truss combined beam and upper and layer connected light steel structure and a construction method thereof. The light steel structure comprises upper wall sheet columns distributed at intervals, lower wall sheet columns distributed at intervals, upper wall sheet column lower connecting pipes connected among the lower parts of the upper wall sheet columns, lower wall sheet column upper connecting pipes connected among the upper parts of the lower wall sheet columns, and truss combined beams connected between the upper wall sheet columns and the lower wall sheet columns through upper and lower connectors, wherein the upper and lower connectors are beam passing buckles, the web plates of the beam passing buckles consist of upper web plates and lower web plates, a square connecting port is formed between the upper web plates and the lower web plates, upper chord member connecting plates are extended from the left and right sides of the square connecting ports, and the upper chord member connecting plates and side plates of the beam passing buckles are positioned in the same plane. Through the light steel structure, the structural stability of a light steel keel house system is enhanced, and the floor surface beams, the connecting pipes and the floor panels do not easily vibrate.
Owner:筑巢(北京)科技有限公司

Deposition forming manufacturing method of parts and molds

The invention discloses a deposition forming manufacturing method of parts and molds, and belongs to the field of non-mold growing manufacturing and remanufacturing. The method comprises the following steps that S1, the three-dimensional CAD model of a workpiece to be formed is subjected to hierarchical slicing; S2, the CNC codes of all hierarchical slices are acquired; S3, deposition forming is conducted layer by layer according to the CNC codes of all the hierarchical slices, the fine portions of the workpiece are formed by laser, and one or more technologies in electric arc welding, electron beam welding, electroslag welding and submerged-arc welding is or are adopted to form the thick wall and the non-fine portions of the workpiece; or in the S3, a heat source which is compounded by laser beams and gas protection electric arcs or a heat source which is compounded by the laser beams and vacuum protection electronic beams is adopted for forming the thin wall and the fine portions of the workpiece, and the gas protection electric arcs or the vacuum protection electron beams are shut down. According to the deposition forming manufacturing method, direct deposition forming can be achieved to obtain parts and molds which are stable in structure property and high in manufacturing precision and are provided with thin walls or fine portions.
Owner:HUAZHONG UNIV OF SCI & TECH

Production method for dedicated steel ball for bearing of high-speed high-precision numerical control machine tool

The invention discloses a production method for a dedicated steel ball for a bearing of a high-speed high-precision numerical control machine tool. The method comprises the following steps of steel ball cold heading, namely machining blank by sleeve cutting, shaping, cold heading multi-station and high-speed cold heading ways; rough machining by adopting a macrocyclic light bulb technology; performing controllable atmosphere quenching, cold treatment and tapering treatment by adopting a continuous drum furnace, automatically controlling carbon potential; surface strengthening by adopting a frequency conversion speed adjusting multi-beating-plate structure; hard grinding by adopting a ceramic sand wheel to perform macrocyclic process to machine; after primary grinding, adopting double-roller sorting; after fine grinding, performing photoelectric eddy current test; performing ultra-fine grinding machining after aging treatment; and performing photoelectric detection after ultra-fine grinding. The diameter variation of the steel ball which is machined and produced by the method provided by the invention is less than 0.07 micron, the roundness is less than 0.05 micron, the spherical error is less than 0.05 micron, the surface roughness Ra is less than 0.07 micron, the variation of the diameter of the ball lot is less than 0.09 micron, and the bearing dmn value of the steel ball after being sleeved is more than 2.5*10<6> mm*r / min.
Owner:SHANDONG DONGE STEEL BALL GRP

Deflection error compensation method for five-axis machining center tool

The invention discloses a deflection error compensation method for a five-axis machining center tool. The deflection error compensation method includes the steps that the milling force is computed according to a built five-axis machining milling force model; the theoretical tool location point and a tool-axis vector serve as the benchmark of mirror image reversible deflection compensation; the tool deflection error, caused by the milling force, of the current tool position is worked out according to the tool deflection; mirror image reversible deflection compensation is conducted on the current tool location point and the tool-axis vector, and a new tool location point and a new tool-axis vector are worked out according to the tool deflection error; a new tool deflection error is computed according to the compensated tool location point data, and whether the new error exists or not is judged; if the requirement is met, operation is stopped, and the tool location point information is stored; and the compensated tool location point data information corresponding to the tool path positions from 1 to N is collated, accordingly the compensated tool location locus is obtained, and a compensated numerical control program is generated through post-processing software.
Owner:TIANJIN UNIV

Device and method for detecting movement errors of working platform in multiple degrees of freedom

The invention discloses a device and a method for detecting movement errors of a working platform in multiple degrees of freedom. Reflected light is reflected onto a three-surface reflector fixed on the working platform through a light path regulation reflector, returns to the light path regulation reflector after being reflected by the three-surface reflector in sequence, is reflected onto a second light splitting piece, enters a beam expanding mirror after being reflected by the second light splitting piece, and is projected onto a detector. Transmission light enters the beam expanding mirror after being transmitted by the second light splitting piece and is projected onto the detector. Two beams of light generate interference on the detector, and measurement on deflection and movement displacement of the working platform can be achieved by regulating shapes of interference fringes and measuring phase displacement. By means of the device and the method for detecting movement errors of the working platform, synchronous and real-time measurement on an angle of oscillation, an angle of pitch and axial movement displacement of the working platform can be performed, real-time compensation is performed according to the measurement result to eliminate effect caused by movement errors, and measurement precision and manufacturing precision can be improved. The angle measurement ranges from +3rad to -3mrad, and measurement requirements of the working platform can be met.
Owner:LINGYUN GROUP WUHAN

Stretch-bending molding process of angle steel component of vehicle body

The invention relates to a stretch-bending molding process of an angle steel component of a vehicle body and mainly aims to scientifically and rationally overcome the defects of overlarge rebound modulus and section bending deflection of workpieces and the like during the stretch-bending molding of the angle steel component of the vehicle body. The process realizes the emulation of pretension and post-tension corresponding to the minimum rebound modulus, provides a computing formula for the initial length of profiles and a trajectory model of a clamp, improves the forming quality, precision and work efficiency of a stretch-bending workpiece and the manufacturing quality of vehicle steel structure, reduces the manufacturing and maintenance cost, overcomes stretch-bending defects and provides basis for the stretch-bending molding precision control of profile parts. The process initially establishes a mathematical model for length rebound modulus of a multi-curvature profile, can precisely determine the initial length of a blank profile of parts, determines the optimal pretension and post-tension by a simulation method and precisely determines the trajectory of the clamp by establishing a multi-curvature profile stretch-bending module, thereby obtaining the ideal forming quality of the formed profile.
Owner:白城市瑞程汽车部件有限公司
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