45 results about "Thermal deflection" patented technology

A gas turbine vane to improve vane performance by addressing known failure mechanisms. A cooling circuit to the trailing edge of a vane airfoil is fed from the outer diameter platform, which prevents failure due to an oxidized and eroded airfoil trailing edge. The gas turbine includes an outer diameter platform, a hollow airfoil and an inner diameter platform with a plurality of cooling tubes extending radially through the airfoil. The cooling tubes are open at the outer diameter end and closed with covers at the inner diameter end. The inner diameter platform is also cooled and includes a meterplate for a portion of the cooling passageway and includes an undercut to improve thermal deflections of the inner diameter platform.

Compression molded pigmented door skins fabricated by compression molding a pigmented, curable, unsaturated polyester sheet molding compound containing a co-curable unsaturated monomer, a low profile additive, and a microvoid-reducing thermoplastic polymer, exhibit uniform stainability while maintaining a low linear thermal coefficient of expansion. Such door skins are suitable for preparing wood grain textured exterior insulated doors which exhibit minimal thermal deflection when exposed to interior/exterior temperature differentials, even at eight foot door heights. The doors may be stained without first applying a seal coat.

A vane assembly for a gas turbine engine is disclosed having lower thermally induced stresses resulting in improved component durability. The stresses in the vane assembly airfoils are lowered by increasing the flexibility of the vane platform and reducing their resistance to thermal deflection. This is accomplished by placing an opening along the vane assembly rail that reduces the effective stiffness of the platform, thereby lowering the operating stresses in the airfoils of the vane assembly. A removable seal is then placed in the opening in order to prevent undesired leakages, while maintaining the benefit of the increased platform flexibility.

The invention relates to a method for curved surface thermal-error compensation of the whole workbench of a precise numerical-controlled machine tool. The method includes acquiring the temperature information of key positions of main shafts of the machine tool and Z-axis coordinate information of representative position point of a workbench, screening temperature sensitive points, establishing a thermal-error model of all measuring points in a workbench scope, embedding the established thermal-error model of all measuring points in a compensator, calculating a predicted thermal deflection of all measuring points at the current temperature and current moment, carrying out curved surface modeling for predicted thermal deflection of all measuring points at the current temperature and current moment, establishing a whole workbench curved surface thermal-error compensation model, calculating the thermal error compensation value of the machine tool at the coordinate position, inputting the obtained compensation value to the machine tool, and realizing Z-axis axial thermal error real-time compensation in the whole workbench scope of the machine tool by combining true origin offset. Modeling and predicting Z-axis axial thermal error of the whole workbench scope are carried out, so that accurate Z-axis axial thermal error compensation value in the whole workbench scope is obtained.

A vane assembly for a gas turbine engine is disclosed having lower thermally induced stresses resulting in improved component durability. The stresses in the vane assembly airfoils are lowered by increasing the flexibility of the vane platform and reducing its resistance to thermal deflection. This is accomplished by placing an opening along the innermost vane assembly rail that reduces the effective stiffness of the platform, thereby lowering the operating stresses in the airfoils of the vane assembly. A removable seal is then placed in the opening in order to prevent undesired leakages, while maintaining the benefit of the increased platform flexibility.

The invention relates to a surface microstructure silicon cantilever enhancement type optical-thermal spectrum trace gas detection method and device. The device comprises a tunable laser, a reflective object, a surface microstructure silicon cantilever, a concave mirror, an optical fiber, an optical fiber coupler, a continuous laser, a laser controller, an optical detector, a signal processing system and the like. Modulated light emitted from the tunable laser is reflected on the concave mirror by the reflective object after passing through the gas to be detected, the received reflective light on the concave mirror is focused on a silicon surface of the cantilever beam. After the optical energy is absorbed by the cantilever beam, the optical-thermal deflection occurs to generate resonance. If the gas concentration is higher, the optical intensity absorbed by the gas is larger, and if the optical energy absorbed by the cantilever beam is smaller and the resonance amplitude is smaller. A length adjustable Fabry-Perot cavity is formed by an optical fiber end surface and a metal surface of the cantilever beam, the amplitude of the cantilever beam is demodulated to obtain gas absorption spectrum, furthermore the concentration of the detected trace gas is obtained. The device has the advantages of cheap price, small size, simple structure, convenience in use, strong flexibility, high detection sensitivity, and field work capacity and can be widely used in remotely detecting the components and concentration of a variety of or multi-component trace gas.

Provided is a method for manufacturing a rare-earth magnet capable of manufacturing a rare-earth magnet with high degree of orientation by sufficient plastic deformation while suppressing cracks at the side faces of a compact that is plastic-deformed during the hot deformation processing. The method includes a step of preparing a compact S, preparing a plastic processing mold including a die D in which a cavity Ca is provided, and punches P that are slidable in the cavity Ca, the cavity Ca having a cross section that is larger in cross-sectional dimensions than a cross section of the compact S that is orthogonal to a pressing direction by the punches P; and a step of placing the compact S in the cavity Ca and performing hot deformation processing, thus manufacturing an orientational magnet C. Let that W1 denotes a length of a short side of the cross section of the cavity Ca and t1 denotes a length of a side of the cross section of the compact S that is placed in the cavity Ca, the side corresponding to the short side of the cavity Ca, t1/W1 is within a range of 0.55 to 0.85, and from some stage during the hot deformation processing, a part of the compact S is constrained at a side face of the cavity Ca so that deformation of the compact is suppressed, but another part of the compact is in a non-constraint state.

The invention discloses a photo-thermal deflection spectrum detection device and detection method. The detection device mainly comprises a pump laser, a detection laser, a detection cavity, an optical position detector and devices for signal modulation, amplification and collection analysis. The method comprises steps of irradiating the pump light to a film to be detected during the detection, forming a refractive index gradient in a medium in the proximity after the film to be detected absorbs the pump light and produces a heating effect, irradiating the detection light to an area having refractive index gradient above the film to be detected, and using an optical position detector to detect the light deflection amount after the light passes through the area. The detection device of the invention is provided with two parallel reflectors on the detection optical path inside the detection cavity, the detection light which is deflected inside the detection cavity is oscillated between two reflectors, and the detection light repeatedly passes through the medium area having the refractive index gradient, which enables the detection light to increase the deflection angle and improve the sensitivity of the photothermal deflection spectroscopy.

The invention provides a light conducting plate composed of extrusion resin boards, wherein heat distortion is difficult to occur even if it is used in thin and large picture of backlight. The light conducting plate is composed of extrusion resin boards with the thickness of 0.1-2.0mm, the extrusion resin boards are placed in a thermal environment of 120 DEG C for 0.5 hours, and both the contraction percentage S1 (%) of the extrusion direction of the extrusion resin and the contraction percentage S2 (%) of the broad width direction of the extrusion resin board are 0-5%. Preferably the in-planedelay value of the extrusion resin board is below 200nm.

The invention discloses a feed shaft thermal deflection compensating method of a comprehensive machining machine. The compensating method is applied to a comprehensive machining machine which comprises a feed shaft and a platform installed on the feed shaft. The compensating method comprises the following steps: assembling a plurality of temperature sensors on the comprehensive machining machine; arranging a control module which is electrically connected with the temperature sensors and comprises a databank, wherein a plurality of preset region parameters corresponding to different movement ranges, and a plurality of displacement error mathematic expressions (corresponding to the preset region parameters) of displacement to be compensated, are stored inside the databank; measuring the feed shaft according to an encoder so as to calculate out the position of the platform by virtue of the control module and selecting one preset region parameter corresponding to the position; subsequently calculating out the displacement to be compensated according to the displacement error mathematic expressions and a plurality of received temperature signals; and moving the platform to a corresponding position, thereby reducing the error caused by the thermal deflection.

The invention provides an apparatus for defect detection of steel structure on the basis of eddy-current heating deflection spectroscopy. The apparatus includes: an induction heating power supply, a coil, a laser emitter, a laser receiving screen, a plurality of laser position sensors and an analyzer. The induction heating power supply is connected to the coil. The coil is arranged at a preset distance from a protective layer surface of a steel structure. The laser emitter and the laser receiving screen are respectively arranged at two sides of a zone between the coil and the protective layersurface. The laser emitter is faced to the laser receiving screen. The laser position sensors are paved on the laser receiving screen. The laser receiving screen is connected to the analyzer. In the apparatus, by means of difference of temperature changes between a defect position and a non-defect position on the steel structure under eddy-current heating, defect detection on the surface of the steel structure inside the protective layer can be completed without damage on the steel structure and the protective layer thereon. Meanwhile, because photo-thermal deflection effect is very sensitive,even a small temperature change can be detected, thus reducing eddy-current heating powder and greatly reducing weight and energy consumption of the apparatus.

The invention provides a thermal bimetal material which comprises the following ingredients in percentage by weight: 40-65% of one of tin, manganese and zinc, 20-35% of iron-nickel alloy, 5-16% of cobalt-based high temperature alloy and 10-30% of inorganic compound particles. The thermal bimetal material provided by the invention has the advantages that the production cost of the thermal bimetal material is reduced, economic benefits are increased, the quality is higher, the electrical resistivity reaches 175 Omega.m, the highest specific thermal deflection rate is 32.5 /DEG C and the thermal bimetal material can replace the conventional high-sensitivity thermal bimetal material.

Using the RIM process, rigid closed-cell polyurethane foams are produced by reacting an organic polyisocyanate with an isocyanate-reactive mixture in which a substantial amount of bio-based polyol is present. Foams produced in this way are characterized by improved heat sag and increased heat distortion temperature.

The invention discloses a roller cooling method and device, and belongs to the technical field of hot rolling. The roller cooling device comprises a supporting mechanism, wherein a cooling cover is arranged on the supporting mechanism; an exhaust pipeline is arranged on the cooling cover; U-shaped cooling manifolds are arranged in the cooling cover; the U-shaped cooling manifolds are connected with the supporting mechanism; nozzles are arranged on the U-shaped cooling manifolds; roller conveying mechanisms are connected with the supporting mechanism and arranged under the U-shaped cooling manifolds; an exhaust mechanism is arranged on the cooling cover; and cooling fans are arranged above the U-shaped cooling manifolds respectively. The roller cooling method and device provided by the invention can increase the cooling velocity of a roller which is dismounted from a rolling mill, reduces influence of thermal deflection caused by uneven cooling of the roller, and thus improves the grinding accuracy of a working roller to obtain an original roller shape expected by a process system.

The invention discloses an optical fiber cantilever beam temperature sensor based on metal coating, which belongs to the technical field of optical fiber sensors. The optical fiber cantilever beam temperature sensor based on metal coating comprises a laser source, a photodetector, an optical fiber circulator, an optical fiber, a fixed supporting end, an optical fiber cantilever beam, a metal film,a fabry-perot cavity and an optical fiber end surface, wherein the optical fiber cantilever beam is located on the optical fiber end surface and is connected with the optical fiber end surface through the fixed supporting end at the edge of the optical fiber end surface; the optical fiber cantilever beam is parallel with the optical fiber end surface to form the fabry-perot cavity, and an opticalfiber integration structure is formed; the outer surface of the optical fiber cantilever beam is coated with the metal film, and a two-film structure is formed; the laser source is connected with theport A of the optical fiber circulator; the optical fiber cantilever beam integration structure is connected with the port B of the optical fiber circulator; and the photodetector is connected with the port C of the optical fiber circulator. The metal film is expanded and contracted under temperature influences and two-film thermal deflection effects are generated with the optical fiber cantilever beam, the optical fiber cantilever beam generates thermal deflection, the length of the fabry-perot cavity is caused to change, light signals emitted by the laser source are reflected in the fabry-perot cavity, and under fabry-perot cavity length modulation, the reflected light signals are detected, and thus, the temperature can be detected.

The invention discloses a mounting structure and method for reducing thermal deflection of a tool tower crane, and relates to the technical field of precision machine tools. According to the technical scheme, the mounting structure for reducing the thermal deflection of the tool turret crane comprises a lathe bed, a mounting frame is arranged on the lathe bed, a lead screw is rotationally connected to the mounting frame, a driving motor for driving the lead screw to rotate is fixed to the mounting frame, a lead screw nut pair is rotationally connected to the lead screw, and a tool tower is slidably connected to the mounting frame. The tool tower is fixedly connected with the lead screw nut pair, a main shaft is arranged on one side of the tool tower, the main shaft is fixed to the lathe bed, the lead screw is pre-stretched to the length after the lead screw is heated and expanded, and an adjusting mechanism is further arranged on the lathe bed, the mounting frame, the tool tower and the main shaft. The adjusting mechanism detects the temperature change of each component, calculates and generates a correction quantity and feeds the correction quantity back to the NC of the machine tool for adjustment. The structure is reasonable, the influence caused by thermal expansion of the machine tool is effectively reduced, and the machining precision of the machine tool is greatly improved.