2141 results about "Thermal deformation" patented technology

The present disclosure provides a device and method for powder distribution and an additive manufacturing method, wherein different size or kind of powders could be chosen to be accommodated within a receptacle. The receptacle can uniformly mix the powder by a rotation movement, pour out the powders by the rotation movement and distribute the powders for forming a layer by a translation movement. In another embodiment, the receptacle further comprises a heating element for preheating the powders. Not only can the present disclosure uniformly mix the powders so as to reduce the thermal deformation and distribute the powder layer compactly, but also can the present disclosure distribute different kinds of powder in different layer so as to increase the diversity in additive manufacturing.

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.

A piston connected with a piston rod is fitted in a cylinder having a hydraulic fluid sealed therein. A damping force is generated through extension and compression disk valves and an orifice. Vehicle height adjustment is performed with a self-leveling mechanism by transferring the hydraulic fluid between the cylinder and a hydraulic fluid tank. A bladder of the hydraulic fluid tank is clamped between an outer flange portion of a partition member and a casing. Because the hydraulic fluid tank is formed without welding, it is possible to avoid contamination of the hydraulic fluid by welding sputter and thermal deformation. Provision of an O-ring on the outer flange portion can reduce the pressure acting from a reservoir on the clamped portion of the bladder and hence prevent dislodging of the bladder.

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.

The present invention is a method of manufacturing a liquid crystal display device, wherein light having an exposure energy is irradiated on the surface of a photo-sensitive resin layer having a predetermined film thickness, and a distribution of thermal deformation characteristics in the thickness direction (or the plane direction) of the photo-sensitive resin layer is formed, then heat treatment is performed to form random undulation (micro-grooves or micro-wrinkles) on the surface of the photo-sensitive resin layer.

Embodiments of the invention provide a perpendicular recording magnetic head capable of reducing leakage magnetic fields from the soft magnetic films on the air bearing surface side and reducing the protrusion of the soft magnetic films in the direction of the air bearing surface side due to thermal deformation of the soft magnetic films. In one embodiment, the write functional section includes a coil conductor, second soft magnetic film pattern and first soft magnetic film pattern that cover the coil conductor from top and bottom and are magnetically coupled to each other, and a main magnetic pole piece determining a track width. The read functional section includes a reading element sandwiched between two magnetic shield films. A pedestal magnetic pole pattern is formed at the frontal end position of the first soft magnetic film pattern.

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.

A method and apparatus of correcting thermally-induced field deformations of a lithographically exposed substrate, is presented herein. In one embodiment, the method includes exposing a pattern onto a plurality of fields of a substrate in accordance with pre-specified exposure information and measuring attributes of the fields to assess deformation of the fields induced by thermal effects of the exposing process. The method further includes determining corrective information based on the measured attributes, and adjusting the pre-specified exposure information, based on the corrective information, to compensate for the thermally-induced field deformations. Other embodiments include the use of predictive models to predict thermally-induced effects on the fields and thermographic imaging to determine temperature variations across a substrate.

The present invention relates to a hair iron having a buffer member, particularly to a hair iron having a buffer member, which is located in between two opposing steel plates to help hair passing through the steel plates to be straightened smoothly and prevent thermal deformation of hair.

The invention is characterized by a hair iron comprising a first pressing member 10 and a second pressing member 20 to which steel plates 12, 22 having built-in thermal wire heaters 13, 23 are attached, respectively. A buffer member 40 is attached to the steel plate 22 which is attached to the second pressing member 20.

The invention discloses a preparation method of polycarbonate/polyester alloy. Glycidyl methacrylate grafted ethylene-octylene multipolymer/organic modified needle-shaped aedelforsite composite toughener, i.e. a technology of simultaneously using organic/inorganic rigid particle toughener is adopted; the glycidyl methacrylate grafted ethylene-octylene multipolymer, organic modified needle-shaped aedelforsite, polycarbonate and polyester are melted and mixed in a double-screw extruder, to obtain high-performance alloy material. The prepared polycarbonate/polyester alloy has excellent integrated mechanical properties and size stability, the notched impact strength reaches 1200J/m, the tensile strength reaches 67MPa, the elongation at break reaches 250 percent, the flexural strength is up to 98MPa, the flexural modulus reaches 2750MPa, and the thermal deformation temperature in high load (1.82MPa) is up to 105 DEG C. Therefore, the prepared polycarbonate/polyester alloy can be applied in cars, and to outer decorations, household electrical appliances, IT and the like industrial products.

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.

Provided is an EGR cooler which can solve the problem of the vibrated tubes without causing thermal deformation due to stagnation of the coolant water, without complexity of piping in the coolant water system and without increase in pressure loss.

The EGR cooler comprises tubes 3 and a shell surrounding the tubes 3, the coolant water being supplied and discharged to and from the shell 1 and being passed through the respective tubes 3 so as to make heat exchange of the exhaust gas with the coolant water. In the shell 1, an intermediate support plate 13 with a plurality of through-holes 14 is arranged and mutually adjacent ones of the tubes 3 are grouped for penetratingly fixture to the through-hole 14. A coolant water passage 15 is ensured between the tubes 3 grouped and penetratingly fixed to the same through-hole 14 of the intermediate support plate 13 for free communication between the tubes 3.

The invention discloses a production technology of an aluminum alloy sectional bar for an automobile bumper and belongs to the technical field of metal machining. The aluminum alloy sectional baral bar for the bumper is processed through the steps of mixing, melting, permanent magnetic stirring, temperature measurement, sampling, ingredient and temperature adjustment, turning down, refining(first purification), standing still, online addition of Al-Ti-B wire, online removal of gas and sand (secondary purification), two-stage filtration, same-level hot top casting, cast ingot homogenization, machining of cast ingot, inspection of cast ingot, heating of cast ingot by an induction furnace, extrusion, precise on-line quenching, stretching and straightening, aging, structure and property inspection of sectional bars, and delivery. The aluminum alloy sectional bar processed by the technology is excellent in thermal deformation performance, and high in strength due to on-line quenching during extrusion. The product has excellent welding performance and corrosion resistance, certain resistance to stress corrosion, and especially has strong shock absorption and folding resistance.

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.

The invention relates to a 3D printing modified polyamino acid material. Raw materials for preparing the 3D printing modified polyamino acid material comprise, by weight, 75-85 parts of polyamino acid, 1-5 parts of a chain extender, 1-5 parts of a crosslinking agent, 0.5-1 part of a nucleating agent, 5-10 parts of a toughening agent, 0.1-0.5 parts of a thermal stabilizer, 1-5 parts of a reinforcing agent and 0.3-0.8 parts of an antioxidant. A low temperature crushing mixing reaction technology is used to modify polyamino acid, so the toughness, the impact strength and the thermal deformation temperature of the modified polyamino acid are greatly improved, thereby the polyamino acid material has a good application prospect in 3D printing.

The invention provides a powder metallurgy preparation method of a carbon nanotube reinforced aluminium alloy composite material. According to the powder metallurgy preparation method, slurry mixing method or in-suit growth method is adopted for pre-preparation of carbon nanotube/pure aluminium flaky composite powder; the carbon nanotube/pure aluminium flaky composite powder is mixed with aluminium alloy powder according to a certain ratio; an obtained mixture is subjected to densifying, sintering, thermal deformation processing and heat treatment so as to obtain the carbon nanotube reinforced aluminium alloy composite material. The powder metallurgy preparation method is capable of solving problems that dispersion of carbon nanotube in aluminium alloy powder is difficult to realize, and hydrolysis is easily caused, so that it is beneficial for preparation of the carbon nanotube/aluminium alloy composite material with high strength, high modulus, and high plasticity.

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.

A thermal deformation compensating method for the main drive system of numeral controlled machine-tool includes such steps as determining several important heat generating sources of numeral controlled machine-tool, acquiring their temp variables and relative thermal deformations of mainshaft, processing them to obtain a mathematical model between temp variation and thermal deformation of mainshaft, inputting it to the numeral control system, acquiring the temp values of several important heat sources, inputting them to the numeral control system, calculating the thermal deformation of mainshaft, and real-time compensation by driving the transmission part.

The invention provides a selective laser forming metal powder preheating method and device. The device comprises a substrate heating device on a forming cylinder piston. Before machining starts, the substrate heating device preheats a substrate to preset temperature, heating is conducted by carrying out laser scanning on metal powder on the section of a workpiece after powder laying and machining, and accordingly the metal powder is preheated. Thus, thermal stress and thermal deformation of the workpiece can be greatly reduced, gas residues among powder can be greatly reduced, and accordingly the aim of improving precision, surface quality and mechanical performance of the workpiece is achieved.

The invention provides a high-strength/toughness magnesium lithium alloy and a preparation method thereof by an accumulative roll bonding process. The method comprises the following steps: a) carrying out homogenizing treatment on a smelted magnesium lithium alloy cast ingot; b) carrying out thermal deformation processing to obtain a magnesium lithium alloy plate; c) carrying out stress-relief annealing; d) cutting the plate for accumulative roll bonding into two pieces with equal size, and carrying out surface treatment; e) fixing the two Mg-Li alloy plates; f) rolling; g) repeating the roll bonding according to the steps d)-f) 4-6 times; and h) carrying out annealing treatment. The obtained alloy comprises the following components in percentage by mass: 7.5-9.5% of Li, 2.5-3.5% of Al, 0.5-1.5% of Zn, less than 0.03% of inevitable impurities (Fe, Cu, Ni, Mn and Si), and the balance of Mg. The magnesium lithium alloy is reinforced according to the specific alloying elements and proportioning thereof, and subjected to multipass accumulative roll bonding at proper temperature to refine the magnesium lithium alloy crystal grains, so that the alloy has higher strength on the premise of keeping favorable plasticity.

The present invention relates to a hair iron having a buffer member, particularly to a hair iron having a buffer member, which is located in between two opposing heating plates to help hair passing through the heating plates to be straightened smoothly and prevent thermal deformation of hair. The invention is characterized by a hair iron comprising a first pressing member 10 and a second pressing member 20 to which heating plates 12 and 22 having built-in thermal wire heaters 13 and 23 are attached, respectively. A buffer member 40 is attached to the heating plate 22 which is attached to the second pressing member 20.

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.

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.

The invention is applicable to the technical field of engineering plastic and provides a PET (polyethylene terephthalate) engineering plastic and a preparation method and application thereof. The PET engineering plastic comprises PET, compatilizer, bromine flame retardant, flame-retardant synergist, nucleating agent, nucleating synergist, oxidation inhibitor and glass fibers and the like. Crystallization density and crystallization rate of PET composite materials are increased and excellent tension, bending, impacting and thermal-deformation performances and excellent injection molding processing performances of the PET engineering plastic are realized by the aid of compounding of the nucleating agent, the nucleating synergist, the flame retardant and the flame retardant synergist. Flame retardant of the PET engineering plastic is improved by compounding of the flame retardant and the flame retardant synergist, tracking of the PET engineering plastic is suppressed or alleviated and CTI (comparative tracking index) value of the PET engineering plastic is increased.

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.

The invention provides a process for preparing aluminum oxide dispersion strengthened copper with high strength and high conductivity, wherein the Cu-Al alloy powder contains 0.1-0.6 wt% of Al and less than 0.5 wt% of impurity, and cuprous oxide is used as an oxidizing agent. The alloy is directly executed cold deformation after sintered and densification treatment, which avoids thermal deformation process in traditional preparation technique. The prepared aluminum oxide dispersion strengthened copper composite material has performances of high strength, high conductivity and excellent high temperature anti-softening, wherein the tensile strength is larger than 500N/mm, the electric conductivity is larger than 80% IACS, and the softening temperature is higher than 600 DEG C; and the tensile strength is larger than 400N/mm after annealing at 950 DEG C for 30min. The aluminum oxide dispersion strengthened copper is ideal material for making a lead frame of an integrate circuit, aerial extension of high speed electrified railroad, a resistance welding electrode, large thrust rocket engine inside lining, etc.

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.

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.

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.

The invention discloses a photocuring adhesive used for adhering optic glass lenses, which consists of the following components in percentages by weight: 50-80% of main resin, 10-40% of auxiliary resin, 5-20% of active monomer, 4-4.5% of photo initiator and 0.5-1% of auxiliary. The main resin is alicyclic epoxy resin. The auxiliary resin is modified epoxy acrylate resin. The active monomer is oneor a mixture of vinyl ether monomers and acrylate monomers. The photo initiator is a radical photo initiator and a cation photo initiator. The auxiliary is a coupling agent. The photocuring optic adhesive has the characteristics of high curing speed, high refraction rate, high light transmittance, low curing shrinkage rate, small thermal deformation, strong adhesion force, small smell, yellowing resistance and the like.