49results about How to "Uniform strain" patented technology

The invention relates to a method for simultaneously rolling and expanding two trapezoid-cross-section flange ring forge pieces. The method comprises cutting a cylindrical billet into material sections; heating the material sections from room temperature to austenitizing temperature evenly and keeping warm; then heading, punching and chambering the material sections to be manufactured into ring piece blanks to be rolled and expanded; baking again and heating the obtained blanks to reach target temperature and keep warm; placing the obtained blanks into a hole mould of a ring rolling machine formed by an irregular-shaped driving roller and an irregular-shaped core roller to be rolled, expanded and formed; achieving the ring forge pieces which is narrow at two ends and wide in middle and with the axial height as twice as the height of a target trapezoid flange; cutting the ring forge pieces from the middle of the axial height, symmetrically dividing a work piece into two parts to obtain two trapezoid-cross-section flange ring forge pieces; and finally turning the forge pieces into end product flanges. The method for simultaneously rolling and expanding two trapezoid-cross-section flange ring forge pieces is high in production efficiency, energy-saving, environmental-friendly and capable of improving utilization rate of raw materials and quality of products.

The invention discloses an extrusion forming method for magnesium alloy housing type component ring ribs. The extrusion forming method comprises the following steps of: (1), placing a processed hollow blank in a barrel-shaped hollowing block; (2), symmetrically arranging at least two split terrace dies in an inner tube of the hollow blank, moving the split terrace dies in the radial direction, respectively extruding the inner tube wall surface of the hollow blank by extrusion bulges of the split terrace dies, forming a certain vacancy between the extrusion bulges of the two split terrace dies, enabling un-extruded part of the inner wall of the hollow blank to plastically flow towards the vacancy between the extrusion bugles to form radial bulges, and automatically returning the split terrace dies; and (3), rotating the split terrace dies by a certain angle to reach positions at which the extrusion bulges of the split terrace dies correspond to the radial bulges, circulating the extrusion operation in the step (2), retracting the extruded split terrace dies, extruding the ring ribs at the periphery, repeating the operations when the split terrace dies reach the position of the next ring rib, and finally forming the qualified housing component with the ring ribs.

The invention discloses an extrusion forming mould for annular ribs of magnesium alloy shell parts. The extrusion forming mould mainly comprises an upper mould plate, a mandrel, a split male mould pull rod, split male moulds, tension springs, a male mould sliding guide rail, a split male mould sliding bottom plate, a supporting plate and a cylindrical female mould, wherein the head part of the mandrel is conical, a center hole is formed in the axial direction of the mandrel, one end of the split male mould pull rod is inserted in the center hole, the other end of the split male mould pull rod is fixed on the split male mould sliding bottom plate, the at least two split male moulds are symmetrically arranged around the split male mould pull rod, are fixedly connected with the split male mould pull rod through the tension springs and are arranged in a radial sliding groove of the split male mould sliding bottom plate through the male mould sliding guide rail, a wedge-shaped inclined plane adapting to the conical head part of the mandrel is arranged at the inner side of each split male mould, an arc-shaped extruding bulge is arranged at the arc-shaped wall surface of the outer side of each split male mould, and the arc length of each extruding bulge is more than the distance between each two adjacent extruding bulges. According to the extrusion forming mould, all the split male moulds do radial movement by virtue of the axial movement of the mandrel, metal flows in the radial direction, and thus the annular ribs are generated.

The invention discloses a heat simulation method for differential temperature rolling, and belongs to the technical field of metal material technology research. On the basis of Gleeble thermal simulated test machine, an air injection cooling device is additionally arranged inside a working cavity of the thermal simulated test machine. The method comprises the experimental steps of manufacturing, sample grinding, thermocouple welding, differential temperature rolling, quenching treatment and experimental analysis. The heating characteristics of the Gleeble thermal simulated test machine, the conventional sample size is changed, an auxiliary cooling tool is used, and the heat simulation method is used for differential temperature rolling technology research, and convenient and fast research means is provided for mature application of the differential temperature rolling technology.

The invention discloses a thermal medium bulging test machine, which mainly consists of a base, a vertical column, a middle beam, an upper beam, a blank cylinder, a heating furnace, a high pressure medium generation device, a bulging device, a bulging height measuring device, a pressure measuring device, an anti-oxidation device and a cooling device, wherein the vertical column is arranged on the base; the middle beam is arranged on the vertical column; the upper beam is arranged on the vertical column; the blank cylinder is arranged on the upper beam; the heating furnace is arranged between the middle beam and the upper beam; the high pressure medium generation device is arranged between the base and the middle beam; the bulging device is arranged in the heating furnace; the bulging height measuring device is arranged on the upper beam; the pressure measuring device is arranged at the outlet end of the high pressure medium device; the anti-oxidation device is connected with the side wall of the heating furnace through a pipeline; and the cooling device is connected with the outlet end of the high pressure medium device and an ejector rod through the pipeline. The base, the middle beam and the upper beam are integrally connected through bolts; the heating furnace is welded and fixed on the middle beam; a cooling separator is fixed on the blank cylinder through the bolts; the ejector rod is fixed on the cooling separator through the bolts; and a cooling water jacket is fixed on the middle beam through the bolts.

The invention discloses a soil and structure contact surface testing machine. The soil and structure contact surface testing machine comprises a body frame, a structure panel, an X-direction motion system, a Y-direction motion system, a Z-direction motion system, a hydraulic loading and control system, a data acquisition system, a confining pressure chamber system, a temperature control system andthe like. The soil and structure contact surface testing machine is specially designed for researching the problem of the soil and structure contact surfaces, and can complete the research on the problem of the contact surfaces between various soil types, such as clay, fine-grained soil and coarse-grained soil and all kinds of structural panels under various saturation or non-saturation temperature field conditions. The normal stress is directly applied to the contact surfaces during the test. The concept is clear and the stress state is clear, the uniform strain of the soil can be ensured, the strain localization phenomenon is eliminated, the constant areas of the contact surfaces are ensured, and it is ensured that the results are true and reliable.

The invention relates to a manufacturing method of a composite material pressure container, which comprises the following steps: 1, connecting an inflating and pressure-maintaining tooling with a lining, inflating the lining with air having a certain pressure to enable the lining to be subjected to swelling deformation, and calculating to determine the internal pressure of the inflated metal lining according to a formula; 2, keeping the lining in a pressure-maintaining state, and performing twisting processing of fibrous composite materials; 3, after the twisting operation is finished, transferring into a curing oven, and performing rotary hot curing; and 4, after the curing operation is finished, naturally cooling, and slowly releasing the internal air to relieve the pressure, thereby ensuring that the elastic contraction of the lining counteracts the compression stress in the twisting process and the curing contraction of the composite material and the lining can be peeled and separated from the composite material layer. According to the invention, the internal stress required in the self tightening process can be reduced, and the swelling deformation rate of the composite material layer can be reduced, thereby lowering the fiber breakage rate of the composite material layer and ensuring high overall performance of the composite material.

Apparatus for dispersion compensating a signal (18) that propagates along a signal path (19), which apparatus comprises a grating (1) and a tuning means (2). The grating (1) is characterized by a wavelength operating range (3) and a group delay (4) that varies with wavelength (5), wherein the group delay (4) is equal at a plurality of pairs of wavelengths (6), (7) that are separated within the wavelength operating range (3), and wherein the grating (1) reflects each wavelength pair (6) from the same region (8) of the grating (1), and different wavelength pairs (7) from different regions (9) of the grating (1).

The invention relates to a mask plate, an evaporated mask plate assembly and a mask plate manufacturing method, and relates to the technical field of displaying. The mask plate comprises at least twoauxiliary mask plates, and all the auxiliary mask plates extend in the first direction and comprise a plurality of mask units arranged in the first direction in sequence; the side surfaces, facing towards the auxiliary mask plates adjacent to the corresponding auxiliary mask plates, of the corresponding auxiliary mask plates are provided with protruding parts corresponding to the mask units; all the protruding parts protrude outwards in the second direction which is perpendicular to the first direction; and the protruding parts between the adjacent auxiliary mask plates can be in overlap jointso that all the auxiliary mask plates can be spliced to form the mask plate with a flat surface. According to the mask plate, the evaporated mask plate assembly and the mask plate manufacturing method, the edges of the mask units are provided with the protruding parts, all the protruding parts are in overlap joint, thus, on the one hand, stress of an opening zone is balanced, and the corrugated state of the mask plate after stretching is improved; on the other hand, the distance between the mask plates is decreased so that the space utilization rate can be increased; and on another hand, theoverall weight of the mask plates is decreased so that the gravity ptotic amount of the mask plates can be reduced.

The invention provides an MEMS (Micro Electro Mechanical System) capacitor film vacuum gauge, which can realize the measurement of the vacuum degree in a range of 1-1000Pa, and the measurement resolution is 0.5 Pa. A pressure sensing film is a circular film with an island-shaped structure film. The circular film is very uniform in radial stress and strain, and under the same pressure, the deflection of the circular film is larger than that of a square film, so that the sensitivity of the pressure sensing film is higher. The island-shaped structure film can increase the rigidity of the film, sothat the deflection of the pressure sensing film is reduced, the basic capacitance is increased, the resolution ratio is improved, and meanwhile, the linearity of the pressure-capacitance relationship is better. Meanwhile, the circular film with the island-shaped structure film is of a double-side electrode differential type sensitive capacitor structure. When the pressure sensing film deforms due to pressure, the sensitive capacitor outputs two capacitances which are equal in variation and opposite in direction, and a double-differential structure is formed through a subsequent differentialmeasurement circuit, so that the common-mode rejection ratio is improved, the influence of parasitic capacitance, temperature and other factors on a measurement result is eliminated, and the measurement resolution is improved.

The invention provides a shoe with a curve L-shaped mass block piezoelectric power generation device used, and belongs to the technical field of vibration energy recovery power generation. According to the shoe, the curve L-shaped mass block piezoelectric power generation device is installed in the shoe, the structure of a curve L-shaped mass block homogenizes strain distribution on a cantilever beam to some extent, and the energy density of a piezoelectric energy recovery device is improved, so that the recovery efficiency of vibration energy is improved; meanwhile, a rectifying circuit and a capacitor or a battery are arranged in the mass block, therefore, the whole device is compact in structure, the reliability is improved, and stored electric energy can be used for charging electronic equipment through conversion.

A crank apparatus includes a crank arm having at least one cavity on one of the surfaces of the crank arm, at least one thin material layer embedded within the at least one cavity and having an exposed outer surface, and at least one sensing element attached to the outer surface of the thin material layer. The crank arm is manufactured of a material with non-uniform strain characteristics, the thin material layer is manufactured of a material with uniform strain characteristics, the crank arm is adapted to be deformed by a force, the thin material layer is adapted to be deformed correspondingly with the deformation of the crank arm, the at least one sensing element is adapted to measure the corresponding strain of the thin material layer to measure the force applied on the crank arm. A bicycle and a stationary exercise bicycle equipped with the crank apparatus are further provided.

Provided is a method for manufacturing a rare-earth magnet capable of preventing the lubricant from flowing down during hot deformation processing, whereby friction force can be made as uniform as possible at the overall region of the sintered body, and so the rare-earth magnet manufactured can have less distribution of magnetic performance. A method for manufacturing a rare-earth magnet includes: a first step of sintering magnetic powder MF as a material of the rare-earth magnet to prepare a sintered body S; and a second step of placing the sintered body S in a cavity K of a forming die M made up of a die D and a lower punch P and / or an upper punch P sliding in the die D, and performing hot deformation processing of the sintered body S to give magnetic anisotropy to the sintered body to manufacture the rare-earth magnet C. In the second step, a lubrication sheet 10 is disposed between a side face of each of the lower and the upper punches P, P facing the cavity K and the sintered body S, the lubrication sheet including a pair of graphite sheets 11 and glass-based lubricant 12 sandwiched therebetween, and the hot deformation processing is performed while sandwiching the sintered body S between the upper and the lower lubrication sheets 10.

The invention discloses a water pollution monitoring biosensor, a monitoring system and a monitoring method, wherein the biosensor comprises an aquatic organism which is a living bivalve organism, anoptical grating fixing structure, and an optical grating; the optical grating fixing structure comprises a first fixing base, a second fixing base and an elastic beam piece, the elastic beam piece isof an arch structure, a first fixing part and a second fixing part of the elastic beam piece are mounted on the first fixing base and the second fixing base respectively, and a bent part in the middleof the elastic beam piece is located between the two fixing bases; the two fixed bases are respectively fixed on the surfaces of two shells of the aquatic organism; the optical grating is a fiber Bragg grating and is adhered to the outer side of the bent part of the optical grating fixing structure; opening and closing of the two shells of the aquatic organism drive the bent part to expand or contract through the two fixing bases, then the optical grating is driven to regularly expand or contract, and signal changes are generated.

The invention discloses a forward and backward extrusion forming die and method for a curved generatrix type shell. Forward extrusion forming space is formed in the bottom of an extrusion female die forming cavity, when an extrusion male die moves downwards, a blank at the lower end of the extrusion male die mainly flows in the forward direction, the forward extrusion forming space is preferentially filled, forward flowing of materials is promoted, and the dependent variable of the materials in a dead area is increased; and when the extrusion male die continues to move downwards, after the forward extrusion forming space is filled, the blank at the lower end of the extrusion male die mainly flows reversely and fills the forming cavity. An overflow groove is formed in the upper portion of abackward extrusion forming cavity, the extrusion male die is pressed downwards into the overflow groove, the blank is extruded in the forming cavity in a closed mode, the blank flows forwards and backwards at the same time, forward flowing of the materials at an opening is promoted, the dependent variable of the materials in a rigid translation area is increased, and therefore uniform material strain of different parts of the shell is achieved, the problems that after an existing curved generatrix type shell is formed, deformation is uneven, and the difference of mechanical properties of different parts and in different directions is large are solved.

In a localized torsional severe plastic deformation method for conical tube metal, a desired region of a conical tube metal can be subjected to severe plastic deformation using molds in which roughness is formed at predetermined regions. The method includes roughening a predetermined region of each of the molds; sticking the conical tube metal only to the roughened regions of the molds; moving the lower mold toward the upper mold to apply a load to the conical tube metal; and rotating the molds to apply severe plastic deformation to the conical tube metal only at the regions stuck to the roughened regions of the molds.

The invention relates to a mold core arbor for a heterogeneous valve body. The mold core arbor comprises a hollow pipe arbor, wherein holes with uneven sizes and distribution are formed in a wall body of the arbor, and the holes with uneven sizes and distribution comprise at least one large hole 1 in at least one of local regions on the wall body of the arbor and at least one small hole 1 in at least one of the other local regions on the wall body of the arbor; and the areas of the large holes 1 are greater than those of the small holes 1, and the cross-section application force of the large holes 1 in the local regions is smaller than those of the small holes 1 in the other local regions. According to the mold core arbor for the heterogeneous valve body provided by the invention, the mold core can meet the requirements of intensity and rigidity, and each cross-section stress is even, so that the stress is even, the barrier when sands are jet can be effectively reduced, the working allowance can be reduced, the follow-up machining difficulty can be reduced, and high product yield can be obtained.

The invention discloses a mask plate and a mask assembly, the mask plate comprises an evaporation area and a peripheral area, and the evaporation area comprises at least one evaporation opening; the peripheral area comprises a solid area arranged around the evaporation area, stress release parts are arranged on the solid area, and the stress release parts surround the evaporation area and are distributed in the circumferential direction. In the mask plate, the stress release parts are formed in the peripheral area, the stress release parts reduce the volume of the stress concentration part in the entity area, and the stress release parts are distributed in the circumferential direction around the evaporation area, so that the stress of the entity area is uniformly released; the stress releasing part is formed in the peripheral area, so that the strain of the mask plate tends to be uniform during net stretching, the mask plate is not prone to wrinkling during net stretching, and therefore the evaporation yield is increased.

The invention provides a preparation method and a preparation device of a flexible electronic device. The preparation method comprises the following steps: uniformly stretching a flexible substrate along the outer contour direction of the flexible substrate; after the flexible substrate is stretched in place, under the stretching state of the flexible substrate, coating the sensitive unit materials on the surface of the flexible substrate in an array mode; and after the sensitive unit material on the flexible substrate is cured, releasing the flexible substrate to enable the flexible substrate to retract to the initial size. According to the preparation method, the flexible substrate is uniformly stretched along the outer contour direction of the flexible substrate, so that the flexible substrate is uniformly deformed outwards along the outer contour direction, the periphery of the flexible substrate is uniformly retracted after the flexible substrate is retracted, the sensitive unit coated on the surface of the flexible substrate is uniformly retracted along with the flexible substrate, the sensitive unit is uniformly retracted, and the strain of the sensitive unit in each direction is uniform; and after retraction, the sensitive unit does not generate cracks or wrinkles.

A method for operating a ride height control device, which includes at least one air spring, of a vehicle body of a vehicle, by providing a setpoint ride height predefined for a journey, and by setting, at the beginning, during or immediately before the end of the journey, the ride height of the vehicle body at least once to a ride height which deviates from the setpoint ride height predefined for the journey.

A crank apparatus includes a crank arm having at least one cavity on one of the surfaces of the crank arm, at least one thin material layer embedded within the at least one cavity and having an exposed outer surface, and at least one sensing element attached to the outer surface of the thin material layer. The crank arm is manufactured of a material with non-uniform strain characteristics, the thin material layer is manufactured of a material with uniform strain characteristics, the crank arm is adapted to be deformed by a force, the thin material layer is adapted to be deformed correspondingly with the deformation of the crank arm, the at least one sensing element is adapted to measure the corresponding strain of the thin material layer to measure the force applied on the crank arm. A bicycle and a stationary exercise bicycle equipped with the crank apparatus are further provided.

A production method includes producing a rare-earth magnet precursor (S′) by performing first hot working in which, in two side surfaces of a sintered body, which are parallel to a pressing direction and are opposite to each other, one side surface is brought to a constrained state to suppress deformation, and the other side surface is brought to an unconstrained state to permit deformation; and producing a rare-earth magnet by performing second hot working in which, in two side surfaces (S′1, S′2) of the rare-earth magnet precursor (S′), which are parallel to the pressing direction, a side surface (S′2), which is in the unconstrained state in the first hot working, is brought to the constrained state to suppress deformation, and a side surface (S′1), which is in the constrained state in the first hot working, is brought to the unconstrained state to permit deformation.