69results about How to "Small amount of thermal deformation" patented technology

The invention relates to a high-speed high-precision built-in dynamic and static piezoelectric main shaft. The high-speed high-precision built-in dynamic and static piezoelectric main shaft is characterized in that the main shaft comprises a box body, a front bearing and a rear bearing are arranged in the box body through a front bearing end cover and a rear bearing end cover correspondingly, and the front bearing and the rear bearing jointly bear a main shaft body internally provided with an online dynamic balancing head; the box body is provided with an oil inlet and an oil outlet, the oil inlet communicates with the oil outlet through an oil way, the oil way is divided into two parts, and one part enters the front bearing and the rear bearing through the oil inlet to suspend the main shaft body in a gap between the front bearing and the rear bearing to form pure liquid lubrication; and the other part is fed to the front bearing and the front bearing end cover to make the main shaft body achieve axial positioning, and a grinding wheel is arranged on the front bearing end cover through a flange disc. The high-speed high precision built-in dynamic and static piezoelectric main shaft is simple in structure, good in dynamic performance, large in rotation number of the main shaft, high in rotation precision and small in heat deformation and can be widely applied to grinding wheel electric main shafts of precise grinding machines, main shafts of numerical control machining centers and precise lathes and the like.

The present invention relates to a mnicar engine cylinder pressure casting aluminium alloy, and its chemical component composition includes (wt%) Cu 1.5-3.0%, Si 10.0-12.0%, Mg 0.15-0.35%, the rest is al and the other is impurity. Said alloy tensile strength Qb is greater than or equal to 300MP. Said alloy has enough strength and rigidity and good size stability. Said alloy can meet the requirements for minicar engine cylinder body high-pressure casting process and mechanical working process.

The invention provides a method for welding a thin-walled cylinder with a magnet sleeved inside in a seal housing component. The welding efficiency of the aluminum alloy thin-walled seal housing component can be obviously improved through the method, quality is stable, a connector is bright, fusion is even, and continuous and compact welding beads can be formed. According to the technical scheme, the method comprises the following steps that the butt joint positions of inner and outer housing welding joints are closely attached through a clamp, and annular welding joint pulse electron beam tack welding is carried out on the circumferential seam crossing of an assembled component; a deflection distance occurring to an electron beam caused by Lorentz force is compensated by an electron beam deflection angle; the total heat input amount of the electron beam is controlled with the impulse waveform of the pulse electron beam, the impulse waveform is steep in the front and gentle in the back, and welding is carried out through heat generated when beam flow ascends and descends; under the condition that small pulse power is set and steam pressure is reduced, a pulse back edge is prolonged by 3-5s, slow reduction is carried out, the focal position of the electron beam is adjusted to be within the range 0.55mm below the surface of a workpiece, the surface of a connector to be welded is melted and integrally welded, and the continuous welding beads are formed.

The invention discloses an insulation cylinder used in a laser crystal growth process. The invention is characterized in that the insulation cylinder is in a split structure, i.e. the whole insulation cylinder is split into unit components which can be mutually spliced to form a cylindrical body. The invention can effectively avoid thermal deformation due to different thermal expansion systems, thereby ensuring the reliability of the production process.

The invention discloses a full-carbon fiber composite material reflecting mirror substrate and a preparation method thereof. The full-carbon fiber composite material reflecting mirror substrate comprises a first panel, a first adhesive film, a honeycomb core, a second adhesive film and a second panel, wherein the first panel is adhered to one side of the first adhesive film; the second panel is adhered to one side of the second adhesive film; and the other side of the first adhesive film and the other side of the second adhesive film are adhered to two sides of the honeycomb core. By designing the first panel, the honeycomb core and the second panel, properties of a carbon fiber composite material are effectively utilized and the problems of a traditional reflecting mirror that the weight is great, the coefficient of thermal expansion is high and the thermal performance is not matched are solved; and layering angles and sequences of the honeycomb core are designed so that the specific modulus of the reflecting mirror is improved and the defect that the honeycomb vertical performances of the traditional reflecting mirror are poor is overcome.

The invention discloses a high-speed motor with a rotor cooling structure, comprising a motor shell, a main shaft of the motor, a front flange component, a rear flange component, a motor stator and a motor rotor. The motor stator is sleeved in the motor shell; the motor rotor is sleeved in the motor stator; the front flange component is assembled at the front end of the motor shell to form into a front end cavity; the rear flange component is assembled at the rear end of the motor shell to form into a rear end cavity; the main shaft of the motor is sleeved in the motor rotor, and the front end and the rear end of the main shaft are respectively supported on the front flange component and the rear flange component; the motor rotor is provided with an air vent hole which communicates the front end cavity with the rear end cavity; the motor stator is provided with an air return hole which communicates the front end cavity with the rear end cavity; and the front end cavity or the rear end cavity on the main shaft of the motor is internally provided with an impeller. The high-speed motor with the rotor cooling structure can be used for cooling the motor rotor, and has high rotation precision, long service life, simple structure and convenient installation.

The invention discloses an additive and subtractive composite manufacturing part deformation prediction and control method and equipment. The method comprises conducting feature recognition and feature decomposition on a target part model, and determining printing parameters; performing finite element thermal coupling analysis of equivalent loading on the model; performing model reversible deformation optimization design according to a simulation result; and determining an optimized final part structure model in an iteration mode. According to the method, a method of combining unit-by-unit activation and Gaussian moving heat source commonly adopted at present is converted into surface heat flow loading of layer-by-layer life and death unit activation in an energy equivalent mode. In the simulation process, birth and death units are used for simulation, all the units are killed firstly, namely, the rigidity is changed into 0, and then the rigidity is activated to be changed into a'birth 'state. Compared with other current life-death unit analog simulation additive manufacturing methods, the method has the advantages that the calculation process can be simplified, the calculation speed can be increased, overall simulation of large parts can be achieved, and an overall temperature field-stress field-displacement field can be obtained quickly.

The invention provides an optical experiment platform capable of achieving active and uniform heat conduction and a preparation method thereof. The optical experiment platform capable of achieving active and uniform heat conduction comprises a panel, threaded holes and U-shaped passages, wherein the U-shaped passages are sealed inside the panel and filled with inorganic heat superconducting materials, the panel is provided with the threaded holes, and the threaded holes and the U-shaped passages are distributed alternately. The optical experiment platform capable of achieving active and uniform heat conduction has the advantages that the inorganic heat superconducting materials are extremely high in heat conductivity, heat can be diffused to the whole platform rapidly after the platform is heated locally, and the heat can be transferred from a hot end to a cold end only in several seconds; since the inorganic heat superconducting materials are uniform in heat distribution, stability of the platform is improved while heat deformation is decreased; influence on accuracy degree of an optical path in an optical experiment is small, and high experiment accuracy and good reliability are guaranteed, so that success rate of the optical experiment is increased greatly.

The present invention relates to laser welding technology, and is especially laser micro welding process for plastic. Micro optical diffraction element is designed based on the weld seam shape and laser wavelength by means of proper algorithm, and formed on transparent chip material through reaction ion etching, UV photo etching or direct laser beam writing. Laser beam is made to pass through the micro optical diffraction element and one standard lens to form laser spot in the shape same as the weld seam for irradiating the joint of two plastic workpieces to complete the laser micro welding. The laser micro welding process for plastic has short processing time, no need of shifting laser beam and welded parts, small heat deformation and other advantages, and is suitable for batch production.

The invention aims to provide a light heating compensating lens and an application method thereof. The light heating compensating lens includes a lens body, a laser attenuator, a laser beam expanding system and a diaphragm. During a heat compensation process, a part of laser passes through the center of the lens body with a central hole and then the laser attenuator for adjustment of heat compensation energy, the laser beam expanding system composed of a concave lens and a concave mirror for adjustment of diameter of heat compensation light beams, and the diaphragm for adjustment of a heat compensation heating range. The laser then goes to the back face of a mirror coated with a highly absorbing film for heat compensation. According to the invention, light energy of a laser can be utilized for realizing the uniform heat compensation of a laser endoscope and heat deformation of a light spot of the laser endoscope can be reduced to a value which is 1/40 of an original one.

The invention discloses a temperature-centrifugation composite environment assessment test device and a test method. The test device comprises a centrifuge test system, a thermal loading unit and a data monitoring processing unit; the centrifuge test system comprises a centrifuge and a fairing; and the thermal loading unit is integrally mounted at the far end of a big arm of the centrifuge, the fairing is mounted outside the thermal loading unit in a sleeving manner, a vacuum environment is arranged inside the fairing, and a test piece is arranged in the thermal loading unit. According to thedevice and the method, vacuum, high temperature, centrifugal load and load history under action scenes such as space isotope heat source product ground emission, space attitude adjustment, space detection, landing and the like can be accurately simulated; a complete data testing system is arranged, multiple parameters such as the temperature, the strain, the vacuum degree and the product state canbe detected in an integrated mode in the testing process, and the product response situation of a tested product under the temperature-centrifugation composite environment can be accurately obtained.

The invention relates to the technical field of a stamping die, in particular to a stamping die, the stamping die comprises a cover plate, a bracket plate, a bottom plate, a first cylinder, an upper stamping block, a lower stamping holder, a pushing unit, a gas collecting box and a magnet unit, wherein the lower end of the bracket is fixedly connected with the upper surface of the bottom plate, and the upper end is fixedly connected with the lower surface of the cover plate; the pushing unit is positioned at the right side of the lower stamping base and fixedly installed on the upper surface of the bottom plate; the magnet unit is positioned in an arc-shaped groove of the lower stamping base; through the mutual cooperation of the cover plate, the bracket plate, the bottom plate, the firstcylinder, the upper stamping block, the lower stamping base, the pushing unit, the gas collecting box and the magnet unit, the stamped metal material is tightly adsorbed by the magnet so as to avoid shaking; and the quality of stamped parts is higher.

The invention relates to a laser composite repair method for surface corrosion of an inner hole of a shell. The laser composite repair method comprises the following steps of disassembling and cleaning the surface of an inner hole of a powder push rod shell, and measuring the dimensions; determining the local corrosion part and corrosion amount of the inner hole; analyzing the powder push rod shell and evaluating the life of the powder push rod shell according to the detection results, and removing the corrosion layer of the inner hole of the shell; and adopting magnetic particle testing, andensuring that no crack defects occur after removal of the corrosion layer. By adopting preset additive materials of microarc deposition GH4169 corrosion resistant metal bars, the trouble that powder is hard to reach the repair part of the inner hole in a laser cladding feeding mode is overcome; by adopting a microarc deposition and laser scanning composite processing mod, a specific method for corrosion repair of the inner hole is formed; beneficial reference is provided for damage repair of the inner hole, and the repair method has the advantages of low heat input amount and thermal deformation amount, and less heat effect on and heat damage to metal base; and the repair quality of the inner hole of the shell can be improved obviously.

The invention discloses an electric heating stove plate used in a ship kitchen. The electric heating stove plate consists of a cast iron plate, electric heating pipes, electric heating wires installed in the electric heating pipes and multiple stove plate wiring post modules, wherein the number of the stove plate wiring post modules corresponds to the electric heating wires in the electric heating pipes. The stove plate wiring post modules consist of stainless steel pipes, leading-out rods, ceramic insulators, pressing nuts and wiring copper nuts, leading-out positions at two ends of each electric heating wire in the corresponding electric heating pipe are respectively connected with one end of the corresponding leading-out rod, the other end of each leading-out rod is sleeved with a ceramic insulator, the pressing nuts and the wiring copper nuts are installed on the leading-out rods, modified magnesium oxide filling layers are arranged around the electric heating wires in the electric heating pipes, and lead-free glass ceramics are arranged at pipe orifices of the electric heating pipes. By means of the technical scheme, the shortcomings in the prior art are overcome, and the electric heating stove plate is simple in structure, economical, environment-friendly, low in cost, convenient to replace, durable and even in heat emitting and ensures the temperature requirement when being used in a ship.

The manufacturing method of assembly parts of this invention first forms a first structure member by using a pressing method, and forms a second structure member by using the metal powder injection molding or die casting method, and then joins the first structure member and the second structure member into one piece by using laser welding. The stand manufactured by using the manufacturing method includes a supporting member formed by the pressing method, and a connection member made by using the metal powder injection molding or die casting method. In this way, the stand formed in one piece by conventional methods is now made by joining two structure members so that the quality problems of shrinkage and sand holes on the surface can be solved, thus increasing the production yields and reducing the cost greatly.

The invention discloses alloy powder for laser cladding. The alloy powder comprises the following components in percentage by mass: 0.05-0.09% of C, 0.8-1.18% of Si, 15.7%-17.86% of Cr, 2.45%-3.38% ofNi, 0.31%-0.5% of Mo, 0.28%-0.32% of Co, 0.01%-0.02% of V and the balance Fe. The alloy powder has the advantages of being small in particle size, large in specific surface area, and capable of reducing heat absorption requirements; and lower laser power can be used to reduce the heat influence on a substrate, and cladding processing precision, scanning speed and cladding efficiency are obviouslyimproved.