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2141 results about "Thermal deformation" patented technology

Automatic welding method based on three-dimensional model and machine vision and welding device based on three-dimensional model and machine vision

The invention relates to an automatic welding method based on a three-dimensional model and machine vision and a welding device based on the three-dimensional model and the machine vision, relating to the technical field of welding. An industrial camera is used for acquiring an image of a workpiece to be welded; three-dimensional match is carried out and the workpiece to be welded is positioned according to the three-dimensional model of the workpiece; a welding line is positioned according to welding line information in the three-dimensional model; the welding line is accurately positioned by using a structure optical sensor; a movement track of a welding gun is adjusted according to the accurate position of the welding line so as to accurately track and weld the welding line. According to the automatic welding method, an automatic positioning and tracking function of the welding line can be realized, and the reliability of tracking the welding line and the tracking precision are improved. The problems that the welding precision is influenced, caused by the fact that the workpiece is warped by thermal deformation in a welding process and the like are solved; the adjustment and the adaptation can be carried out very well and the welding quality is improved.
Owner:南京曼新智能科技有限公司

Selection optimization method of numerically-controlled machine tool thermal error compensation modeling temperature measuring point combination

The invention relates to a selection method of numerically-controlled machine tool thermal error compensation temperature sensor measuring point positions. The influence of temperature measuring points at all positions on a machine tool thermal error is identified on the basis of a main factor strategy and a weight product method theory. The method comprises the specific steps that firstly, k temperature sensors are arranged at special positions of a machine tool to measure the real-time temperature values, changing along with the time, in running of the machine tool, and meanwhile thermal displacement of a main shaft arranged on a tool rest is recorded; secondly, part of temperature measuring point positions are removed according to the main factor strategy; thirdly, a BP neural network model capable of simulating changes of the thermal error is built; fourthly, the weight product method is utilized for identifying the influence of remaining measuring point positions. According to the method, the problem that in the process of numerically-controlled machine tool thermal error compensation modeling, the temperature measuring points are too many or the robustness of the compensation model is poor is solved. According to the method, temperature measuring modeling with the fewest temperature sensors is utilized for predicating the error generated by dynamic thermal deformation of the numerically-controlled machine tool, the number of the machine tool temperature measuring points is reduced, and cost is saved.
Owner:JIANGSU QIHANG CNC MASCH TOOL CO LTD +1

Powder metallurgy preparation method of carbon nanotube reinforced aluminum alloy composite material

ActiveCN103789564ARapid precipitation strengtheningReliable and efficient processMicro nanoThermal deformation
The invention provides a powder metallurgy preparation method of a carbon nanotube reinforced aluminum alloy composite material. The method comprises the following steps: pre-preparing micro-nano flake powder of an alloying component, subsequently ball-milling the powder with a carbon nanotube and spherical pure aluminum powder to prepare flake composite powder, and further performing densifying, sintering, thermal deformation processing and thermal treatment to achieve alloying so as to finally obtain the carbon nanotube reinforced aluminum alloy composite material. Uniform compounding of the matrix aluminum powder, the carbon nanotube and the alloying component can be achieved through limited ball-milling, and meanwhile dangerous elements or uneasy grinding elements such as magnesium and silicon which are high in activity and likely to combust and explode are avoided by adopting the stable and easily ground pre-alloying aluminum powder, so that the security and the reliability are improved; in addition, because of large interlayer boundary and small layer thickness distance, the flake structure is beneficial for uniformly dispersing the alloying component and forming refined dispersed separated phase. The method is beneficial for bringing the effects of composite reinforcement of carbon nanotubes and alloy reinforcement into play to the maximum extent, is energy-saving and time-saving, and is safe and feasible.
Owner:SHANGHAI JIAO TONG UNIV

Machining method of three-dimensional closed impeller

The invention relates to a machining process of an impeller of a compressor, in particular to a machining method of a three-dimensional closed impeller, which is to clamp a semi-finish turned forge piece on a five-axis linked computer numerical control machining center to perform closed channel overall milling including drilling, coarse machining, semi-precision machining, back chipping and finish machining to mill the entire impeller and impeller channels. Compared with the conventional welding method, the machining method has the advantages that: the raw materials are saved and production cost is reduced as only one entire forge piece blank is used; the working efficiency is improved greatly because fewer machining process procedures are adopted and machining speed is high; the machining quality is high as quality defects caused by thermal deformation and welding are avoided; the machined impeller has high strength and high corrosion resistance; and the machining time of the impeller is reduced and the life index of a tool is improved because the flow the overall milling machining method is optimized according to the material, structure, specification and technical requirements of the workpiece and an applicable tool is configured according to different machining process procedures.
Owner:SHENYANG BLOWER WORKS GROUP CORP +1

Implementation method of automatic compensation for thermal deformation of machine tool

The invention discloses an implementation method of automatic compensation for thermal deformation of a machine tool, which comprises the following steps: (1) establishing a three-dimensional CAD model of the machine tool; (2) actually measuring the temperature field of the machine tool; (3) establishing a thermal characteristic finite element model of the machine tool; (4) calculating and correcting a finite element temperature field model; (5) actually measuring the thermal deformation of the machine tool; (6) determining the number and positions of temperature sensors; (7) calculating and correcting a finite element thermal deformation model of the machine tool; and (8) virtually analyzing the thermal compensation finite element of the machine tool. The method corrects the finite element temperature field and the thermal deformation model of the machine tool, so that the established finite element model of the machine tool can truly reflect the practical situation of the thermal deformation of the machine tool; and thus, the invention has the advantages of high compensation precision and good stability. In the method, multiple thermal compensation testing processes on the machine tool are completed by a computer through virtual analysis, thereby shortening the development cycle and reducing the development cost.
Owner:四川普什宁江机床有限公司

Novel repair and reconstruction technique for defect treatment of strip coiler hollow axle

The invention relates to a new technique method for treating and repairing the defects of a hollow shaft of a coiling machine with steel or reforging the hollow shaft of the coiling machine with steel. The technique method solves a series of technique problems such as material selection limitation, large thermal stress during the technique process, large thermal deformation, coarse material grains, poor bonding strength of matrix material, great effect of thermal welding processing on the mechanism performance of the base material, and the like. Both a laser cladding composite layer and the matrix have no coarse structure, a cladding layer and a base interface have compact structure and fine grains and the cladding structure has no crackle, inclusion and other defects; the cladding layer and the matrix form alloy combination and do not fall off; the thermal deformation is small, the stress is low and the surface hardness is high; the matrix dilution ratio is low, the size and position of the cladding layer can be controlled precisely, the mechanical finishing allowance after cladding is small, and the composite functional layer is characterized by high corrosion resistance and high abrasion performance. The method does not pollute the environment, has high production ratio and low energy consumption and greatly reduces the fittings consumption cost of enterprises.
Owner:岳阳大陆激光技术有限公司 +2

Polypropylene material filled with inorganic mineral powder, and its preparation method and application

InactiveCN102206376AExcellent resistance to folding fatigueImprove cold resistanceFlexural modulusMicrosphere
The invention discloses a polypropylene material filled with inorganic mineral powder, and its preparation method and application. The polypropylene material comprises, by weight, 43 to 90% of polypropylene, 0 to 1% of a heat stabilizer, 0 to 1% of a lubricant, 0 to 15% of a flexibilizer and 10 to 40% of an inorganic mineral powder filler, wherein the inorganic mineral powder filler is one selected from the group consisting of calcium carbonate, powdered steatile, kaolin, mica, wollastonite, glass microballoons, ceramic microspheres and barium sulfate or a mixture of the above-mentioned materials. When used as a material for hinges, the polypropylene material filled with inorganic mineral powder in the invention has excellent folding resistance which is similar to that of a pure polypropylene material, good fatigue durability and comprehensive mechanical properties, outstanding cold resistance and high thermal deformation temperature, wherein tensile strength is no less than 30 MPa, flexural modulus is no less than 2000 MPa, the thermal deformation temperature is no less than 110 DEG C; the material can be used for a long time at a temperature of from -35 to 85 DEG C and can be used to prepare hinge materials which have requirements for high heat resistance and cold resistance.
Owner:SHANGHAI KINGFA SCI & TECH

Comprehensive monitoring system and method for temperature and thermal deformation of high-speed numerically-controlled lathe

The invention discloses a comprehensive monitoring system for temperature and thermal deformation of a high-speed numerically-controlled lathe, which comprises a data acquisition module, a data processing module and sensors, wherein the sensors are arranged on a motorized spindle and a cutting tool for monitoring the temperature or the thermal deformation of the motorized spindle and the cutting tool; temperature or thermal deformation signals acquired by the sensors are transmitted to the data acquisition module through a signal conditioning circuit, and then provided for the data processingmodule to be processed after analog-to-digital conversion. The comprehensive monitoring system for temperature and thermal deformation of the high-speed numerically-controlled lathe is characterized in that the sensors comprise infrared temperature sensors, platinum-rhodium wire temperature sensor groups, Pt100 temperature sensor groups and laser displacement sensor groups; the platinum-rhodium wire temperature sensor group are arranged on at least three faces of the blade of the cutting tool of the high-speed numerically-controlled lathe; the Pt100 temperature sensor groups are arranged on at least three faces of the handle of the cutting tool of the high-speed numerically-controlled lathe; the infrared temperature sensors are arranged on the side faces of the motorized spindle of the high-speed numerically-controlled lathe; and the laser displacement sensors are positioned on the axial extension line of the motorized spindle of the high-speed numerically-controlled lathe for monitoring axial thermal deformation of the motorized spindle and thermal deformation of the tip of the cutting tool.
Owner:RES INST OF XIAN JIAOTONG UNIV & SUZHOU

Error compensation based corner processing precision control method

The present invention relates to an error compensation based corner processing precision control method and, more particularly, to a method for controlling corner processing precision based on error compensation. The invention is designed to solve the problems that the processing precision in prior art is low, the requirements for the machine tool and the numerical control system are high and the error is large. The method comprises the following steps: 1) establishing a milling force model for corner processing; 1A) establishing a micro-element milling force model; 1B) establishing a milling force model for the corner processing process; 2) establishing a cutter deformation model according to step 1; 3) conducting error iterative compensation to the cutter compensation model established in step 2 for the corner processing cutter path after compensation. The present invention facilitates the optimization of geometric kinematic errors, milling force errors, and thermal deformation errors in corner processing. The method of the invention plays an important role in improving the processing precision and the processing efficiency of corner milling and processing of a mold cavity. The invention finds applications in corner processing of mold cavities.
Owner:HARBIN UNIV OF SCI & TECH

Separated-type wave foil dynamic pressure gas thrust bearing

The invention relates to a separated-type wave foil dynamic pressure gas thrust bearing capable of bearing certain axial load. The separated-type wave foil dynamic pressure gas thrust bearing comprises a bearing chassis, flat foil sheets, wave foil sheets and a gasket, wherein the circle of the bearing chassis is divided into a plurality of parts by clearances along the radius direction; the flat foil sheets and the wave foil sheets are inserted into the clearances; the gasket is inserted into a rectangular groove in the bearing chassis; a screw is screwed in a threaded hole at the rear part of the bearing chassis, and presses the gasket tightly so as to fix the foil sheets; the rigidity of the separated-type foil sheets can be changed along the radius direction and the circumference direction; the rigidity characteristic is beneficial to the adaptation of nonuniform pressure distribution for the bearing caused by velocity differences along the radius direction, so that the pressure can be homogenized, and the foil sheet deformation can be harmonized, and the bearing loading capability can be improved; slits among foil belts can ensure that the foil sheets prevent thermal deformation caused by nonuniform temperature distribution, and also can ensure that the bearing is adaptive to less axial deviation; the foil belts are connected integrally at free ends, and the damage on pressure air membrane surfaces caused by radial deviation of the foil sheets can be prevented.
Owner:NANJING UNIV OF AERONAUTICS & ASTRONAUTICS

Radial ventilation cooling structure of motor

The invention provides a radial ventilation cooling structure of a motor. The radial ventilation cooling structure for the motor comprises at least three iron core sections, wherein ventilation channel steel is arranged between every two adjacent iron core sections; a ventilating duct is formed between every two adjacent iron core sections and the ventilation channel steel; the impedance of the multiple ventilating ducts is gradually increased along two ends of the motor to the middle direction of the motor. According to the radial ventilation cooling structure of the motor, provided by the invention, the impedance of the multiple ventilating ducts is gradually increased along the two ends of the motor to the middle direction of the motor, so that the balance of the flow of wind flowing through the multiple ventilating ducts can be improved, and further the balance that the temperatures, along the axial direction of the motor, of a coil and the multiple iron core sections are distributed is improved; under the condition that total flow of the wind is unchanged, a maximum temperature value is reduced, and motor shutdown caused by overhigh local temperature rising is effectively avoided; meanwhile, thermal deformation of an iron core bracket is reduced, and normal operation of the motor is guaranteed.
Owner:BEIJING GOLDWIND SCI & CREATION WINDPOWER EQUIP CO LTD

Halogen-free flame retardant polyamide 6 composition

The invention discloses a halogen-free flame-retardant polyamide 6 composition with high toughness and antistatic property. The composition comprises active magnesium hydrate, organic phosphate oligomer, zinc oxide crystal whisker, a macromolecular compatilizer, a plasticizer and an additive. The active magnesium hydrate and the organic phosphate oligomer are used to improve flame retardance; organic anlistatig and the zinc oxide crystal whisker are used to improve the antistatic property; and the macromolecular compatilizer is used to improve interaction among polyamide, the inorganic magnesium hydrate and the zinc oxide crystal whisker. The flame-retardant polyamide 6 composition has the advantages that compared with a sole magnesium hydrate flame-retardant polyamide 6, the use amount of the magnesium hydrate is reduced to below 50 mass percent; the impact strength of a gap is increased by over 80 percent; the breaking elongation rate is improved by approximately 20 times; the resistivity is reduced by 4 orders of magnitude; the flame retardant performance reaches UL94V-0 level; simultaneously, the toughness is basically maintained at the level of pure polyamide 6; the temperature for thermal deformation is much higher than 65 DEG C of the pure polyamide 6; and the molding shrinkage rate is reduced to 0.6 percent from 1.78 percent of the pure polyamide 6.
Owner:GUANGDONG XINHUI MEIDA NYLON
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