230results about How to "Avoid concentrated stress" patented technology

The present invention provides a semiconductor device exhibiting an improved reliability. A semiconductor device comprises a semiconductor chip having an electrode on a surface thereof and a mounting substrate, and the electrode (aluminum electrode) of the semiconductor chip is coupled to the mounting substrate through a bump (solder bump 104). A plurality of diffusion barrier films (UBM 112) for preventing a diffusion of a material composing the bump is provided between the electrode and the bump, and the diffusion barrier film is formed to have a plurality of divided portions via spacings therebetween.

The invention relates to a method for forming a grating for machine tool measurement in a two-step solidifying rolling pressing forming manner, which comprises the following steps: 1) coating an ultraviolet light solidifying adhesive layer on a grating blank substrate; 2) manufacturing a rolling mould having a prototype grating structure on the surface of a cylindrical mould, making an alignment mark, and polishing and performing low surface energy treatment on the surface of the rolling mould; 3) coating a flexible film on the adhesive layer on the grating blank substrate, carrying out primary exposure and peeling the film; 4) comparing the alignment mark on the grating blank substrate with an acquired alignment mark image on the surface of the rolling mould, adjusting and calibrating; 5) gluing the rolling mould with the grating, applying a pressing force, and compounding the prototype grating structure on the surface of rolling mould on the adhesive layer on the surface of the substrate; 6) carrying out exposure on the compounded ultraviolet light solidifying adhesive layer; and 7) collecting and packaging the grating. According to the method, the required pressing force is small, and thus, the substrate deformation and stress concentration are avoided. The method has high production efficiency and can be used for realizing the mass production of the grating for large-area and altitude machine tool measurement.

An oval single-tube two-way vacuum pipeline traffic system comprises an oval pipeline. The oval pipeline is internally provided with a two-way travelling vehicle, vehicle upward suspension magnetic poles are arranged on the two sides of the travelling vehicle and matched with an outer suspension track and an inner suspension track correspondingly, and the outer suspension track is connected to theinner wall of the oval pipeline. The inner suspension track is supported on the inner wall of the oval pipeline through a track first support. A support rod is arranged at the position of a short shaft of the oval section of the oval pipeline, a semi-oval groove-shaped support seat is arranged along the exterior of the oval pipeline, and tight-pushing clamps are arranged on the position, on the horizontal positions of the two sides of the exterior of the pipeline, of the upper portion of the groove-shaped support seat along the long axis of the section of the oval pipeline. Adjusting and fixing are conducted through adjusting bolts. As for a vehicle with the same section, the blockage ratio in two-way double pipelines is slightly decreased, and the train travelling pneumatic resistance isreduced; and pipeline manufacturing materials are reduced, the pipeline erecting work procedure is reduced, the cost is reduced, the effective clearance in the pipeline is greatly increased, and mounting, examining and maintaining are conveniently facilitated.

The invention relates to a connection device of a prestress concrete and steel combination wind power generation tower. The lower surface of a lower connection flange is provided with anchor bars connected with a concrete tower section. The connection device is further provided with prestress application components, a tension anchor flange and the lower connection flange are respectively and uniformly provided with flange holes for the prestress application components to pass, and the flange holes of the tension anchor flange are the same as those of the lower connection flange in quantity and correspond to the flange holes of the lower connection flange in a one-to-one mode in the vertical direction. The prestress application components sequentially penetrate through the flange holes of the anchor flange and the flange holes of the lower connection flange and penetrate through the concrete tower section on the lower portion. The top ends of the prestress application components are anchored on the top face of a lower section connection steel cylinder through anchorage devices after the prestress application components are tensioned. Concrete is poured between the tension anchor flange and the lower connection flange to form a prestress concrete structure. Due to the connection mode, the concrete on the flange connection section is uniformly stressed, stress concentration is reduced, the tensile stress level of the concrete is improved, and the situation that the concrete cracks is avoided.

The invention discloses a nanostructure tungsten-zirconium carbide alloy. The nanostructure tungsten-zirconium carbide alloy comprises the following components by weight percentage: 98-99.8% of tungsten, and 0.2-2.0% of zirconium carbide with the grain diameter of 5-300 nm, wherein the zirconium carbide grains are mostly uniformly distributed in the interiors of the tungsten crystal grains. The invention further discloses a preparation method of the alloy. The prepared alloy has good mechanical property and high-temperature stability; the zirconium carbide nanograins can be uniformly distributed in the interiors of the tungsten crystal grains, so that stress concentration and embrittlement generated by coarse particle in the tungsten crystal grains are avoided; the strength and high-temperature performance can be improved by pinning dislocation, and meanwhile, the toughness is ensured.

The invention relates to a preparation method and a molding mold of thermal flared end fluoroplastic pipe, which is that a flared end fluoroplastic pip is clamped in a mounting hole of a flared end cavity die with a trumpet flared end and rotates with a chuck of a lathe spindle; a male die expander with a heater and temperature control device is used for heating the head the flared end to flaring temperature and the head the flared end is fed through a lathe tail spindle to ensure that the fluoroplastic pipe is intenerated in rotating and tightly joined and matched with trumpet flared end of the flared end cavity die and cooled to form mold. The heater is fixedly connected on a the male die expander and electrically connected with the temperature control device controlled the temperature of the flared end; the flared end cavity die clamped in a rotator comprises two symmetrical clutch semicylinders is positioned on the same central line with the flared end head of flared end cavity die. The utility model takes advantage of the cold flow property of fluoroplastic to solve the defects that stress centralizes and leaves at the flared end, material is easily decomposed and the flared end is easily cracked. The invention ensures that the wall thickness of expanded trumpet flared end is more uniform and the surface of the flared end is smoother and avoids the occurrences of crinkle, forting and rippling.

This invention discloses a supporting joint used in girders or rack, characterized in that it comprises an erection support connected with a supporting member, and connected with several joints formed from the integrated component. Said supporting joint is easy to manufacture and install, and it has firm structure and high precision, in addition, it can be used for force analysis and computing.

The invention relates to a scanning method used for a metal laser selective melting forming process. By means of the method, the probability that thermal stress concentration, stress concentration, cracking and other defects happen in the metal part forming process is greatly reduced, and the forming quality of final parts is ensured. The method comprises the main steps that (1) contour offset iscarried out; (2) multiple Thiessen polygons are constructed in an inner contour area; (3) the inner contour area is canned; (4) a narrow-side outer contour area is scanned; (5) the steps from 1 to 4 are repeated till scanning of all of N-1 layers of sections is completed; and (6) the Nth section is scanned.

The invention provides a display panel and a manufacturing method thereof. A display area and a bending area are defined on the display panel, the display panel comprises a flexible substrate, a firstinorganic insulating layer, a first organic insulating layer, a first metal layer, a second organic insulating layer, a second inorganic insulating layer, a second metal layer and a third organic insulating layer which are arranged in a stacking mode. The manufacturing method of the display panel comprises the following steps of: providing a flexible substrate, manufacturing a first inorganic insulating layer, manufacturing a first organic insulating layer, manufacturing a first metal layer, manufacturing a second organic insulating layer, manufacturing a second inorganic insulating layer, manufacturing a second metal layer and manufacturing a third organic insulating layer. According to the invention, the second inorganic insulating layer of the bending area is arranged on the second organic insulating layer, so that residues of the second inorganic insulating layer generated in the through holes of the first metal layer are avoided, the risk of stress concentration or film peeling generated by a first signal line under bending stress is avoided, and the product yield is improved.

The invention provides a design method of the optimal coal pillar alternate distance of a shallow buried multi-seam working face. The reasonable coal pillar alternate distance of an upper coal seam and a lower coal seam is determined through a terrestrial surface displacement law and a coal pillar concentrated stress propagation law, the stress concentration area of the upper coal seam is avoided, the disturbance of ground depression happening after shallow buried multi-seam mining is reduced, terrestrial surface concentration cracks are avoided, terrestrial surface uniformly sediments, and an environment-friendly development method integrating safe mining and terrestrial surface damage reduction is provided for shallow buried multi-seam mining.

The invention discloses a tin-bismuth composite alloy and a preparation method thereof. The method comprises the following steps: synthesizing conductive polymer nano fiber, and preparing a metal coating layer on the surface of the conductive polymer nano fiber; adding the conductive polymer nano fiber with the metal coating layer into an organic solvent, and dispersing; performing secondary doping treatment; preparing nano tin powder and nano bismuth powder respectively; adding the obtained nano tin powder and nano bismuth powder into the organic solvent, and performing acid pickling treatment; performing purification treatment to obtain pure nano composite powder; mixing the obtained conductive polymer nano fiber after the secondary doping treatment, the obtained nano composite powder and a soldering flux, and stirring to obtain uniform tin-bismuth composite powder; performing sintering treatment on the tin-bismuth composite powder to obtain the tin-bismuth composite alloy. Through the method, a low-temperature tin-bismuth composite alloy material with a low melting point and high toughness is obtained.

The invention belongs to the technical field of foundation reinforcement, and discloses a tube-immersed cast-in-situ pile and its construction technology. The tube-immersed cast-in-place pile involves a pile tip, a pile pipe, a geotextile bag, a pile body and a reinforcement cage. The technological process is as follows: 1) 2) Immerse the pipe; 3) Put it into a geotextile bag; 4) Pouring concrete; 5) Hanging the reinforcement cage; 6) Pulling out the pipe; 7) Forming. The invention avoids common problems such as necking piles, broken piles, stilted piles and pile tip water inflow in the traditional sinking tube pouring pile process, and ensures the formation of the pouring piles, thereby effectively increasing the bearing capacity of the piles.

The ends of the pins (2) rotatably supporting the rolling bodies (1) are fitted in pin receiving holes (4) in the annular side plates (3). The interference between the pin receiving hole (4) and the outer diameter of the pin (2) is in the range of 5 to 40 μm. The end of the pin (2) is welded to the annular side plate (3), wherein the end of the pin (2) is pressed into the pin receiving hole (4) with an interference of 5-40 μm.

The invention belongs to the technical field of automobile manufacturing and provides an automobile drive axle housing and a manufacturing technology and a manufacturing mold of the automobile drive axle housing. The manufacturing technology comprises a blanking process, a thickening process, a shifting process, a hydraulic molding process, an aging process, a finish machining process, a welding process, a drilling process and a coating process. According to the automobile drive axle housing and the manufacturing technology and the manufacturing mold of the automobile drive axle housing, by additionally arranging the thickening process, the shifting process and the hydraulic molding process, the welding positions of the automobile drive axle housing and the juncture number of parts are reduced, so that the finish machined axle housing is of a structure formed integrally; the problems of stress concentration and cold joint caused by the welding process are avoided, the finished product sealing performance of the whole axle housing is ensured, and occurring of the oil leakage phenomenon is reduced; in addition, by means of the structure formed integrally, the strength of the automobile drive axle housing can be improved, fracture is prevented, and the reliability of the whole automobile drive axle housing is improved; accordingly, the axle housing is light in weight, and the cost is reduced.

The invention discloses a constant support and hanger which comprises a shell, a pull rod assembly, a locking device and a load assembly. The load assembly comprises an upper pull rod and a lower pull rod, a longitudinal counter bore is formed in the lower end of the upper pull rod, inner threads are arranged in the longitudinal counter bore, outer threads are arranged on the periphery of the lower pull rod, the upper pull rod and the lower pull rod are connected to form a whole through the threads, a first transverse through hole and a second transverse through hole are transversely formed in the bore wall of the longitudinal counter bore in the radial direction, the center line of the first transverse through hole and the center line of the second transverse through hole are both perpendicular to the center line of the longitudinal counter bore, and an included angle alpha is formed between the center line of the first transverse through hole and the center line of the second transverse through hole and is an obtuse angle. Grooves corresponding to the first transverse through hole and the second transverse through hole respectively are formed in the peripheral face of the upper end of the lower pull rod. When connection is carried out, transverse rods are inserted into the first transverse through hole and the second transverse through hole respectively, and one end of each transverse rod is inserted into the corresponding groove. The constant support and hanger is convenient to use and firm in connection.