45results about How to "Eliminate dents" patented technology

The invention discloses a plasma etching method and device, wherein, the method includes the following steps: the inside of a reaction chamber is provided with a semiconductor substrate which is provided with a to-be-etched material layer; etching gas which is ionized into plasma by a radio frequency power source is fed in the reaction chamber; the radio frequency power source outputs radio frequency power in pulse output mode. The device comprises a reaction chamber, a wafer holder, a first radio frequency power source, a loop winding, a second radio frequency power source and a pulse control circuit, wherein, the inside of the reaction chamber contains the etching gas; the wafer holder is used to bear the weight of a semiconductor wafer; the first radio frequency power source provides bias voltage for the wafer; the loop winding is arranged at the upper part and the top of the reaction chamber; the second radio frequency power source which is used to generate radio frequency power is connected with the loop winding through the pulse control circuit and outputs radio frequency power in pulse output mode to ionize the etching gas into plasma. The invention can generate plasma which is output in pulse mode and used for etching, thereby improving the control precision of etch end point.

The invention discloses a refill friction stir spot welding method which is characterized in that a circular convex block is arranged at a welding spot of an upper plate of a workpiece; during welding, a hold-down ring of a stirring head is contacted with the upper plate and surrounds the convex block, and a stirring needle and a sleeve are contacted with the convex block; with the application of ultrasonic vibration to positions, on the outer side of the hold-down ring, of the upper plate, a material in a welding zone is plastified through the rotation of the sleeve and the stirring needle, then the sleeve pricks downwards to penetrate through the upper plate and pricks into a lower plate by a certain depth, the stirring needle is drawn back with the downward pricking of the stirring needle, after the sleeve reaches the designed downward pricking depth, the sleeve and the stirring needle return to initial positions, and continue to rotate and press down in the initial positions to allow the surface of the welding spot to be smooth, and after the stirring head stops rotating, an operator continues to apply the ultrasonic vibration for a certain time. According to the refill friction stir spot welding method, by employing the convex block for compensation, a pit of the welding spot produced after the welding can be eliminated; through the ultrasonic vibration, material flowing and material exchange between the upper plate and the lower plate can be improved, and the joint quality is improved; and the operator continues to apply the ultrasonic vibration after the welding, so that the residual stress of the welding spot can be reduced.

The invention discloses a method for producing low-alloy peritectic steel by a conventional slab continuous casting machine. The method comprises the technological processes of decarburization converter smelting, LF refining and slab continuous casting. Through the adjustment on the continuous casting procedures of the conventional slab continuous casting machine, the phenomenon of large liquid level fluctuation during peritectic steel pouring is eliminated, the shock mark depth of a casting blank is obviously reduced, cracks and concave parts in the surface of the casting blank are eliminated, the conventional slab continuous casting machine can produce flawless low-alloy peritectic steel in batches, and high-quality raw materials are provided for low-alloy high-strength steel stable in production performance.

The invention discloses a display device packaging method. The method comprises the following steps of coating the cover plate glass with a heating decomposable glue; carrying out screen printing on the frit glue, wherein the frit glue is positioned on the heating decomposable glue; and baking the heating decomposable glue and the frit glue. The decomposition temperature of the heating decomposable glue is different from the curing crystallization temperature of the frit glue, and the frit glue is still in a molten state at the decomposition temperature required for the heating decomposable glue, so that the height generated by the decomposed frit glue is poor. The frit glue in the molten state automatically flows to fill the position occupied by the original heating decomposable glue, sothat recesses generated during the screen printing of the frit glue are eliminated, and the frit glue is cured and crystallized along with the temperature rise, and accordingly the recesses generatedby the screen printing of the frit glue are eliminated, and the quality of a packaging process is improved.

The invention discloses a method for producing anhydrous citric acid crystals. The method comprises the following steps: crystallizing a citric acid solution under the circulating stirring condition to obtain a crystal slurry solution; changing the initial temperature of the crystal slurry solution to repair crystals in the crystal slurry solution, and obtaining a solution containing the anhydrous citric acid crystals, wherein the process of changing the initial temperature of the crystal slurry solution comprises the following steps: (1) heating the crystal slurry solution to 2-20 DEG C after crystallization; (2) cooling the crystal slurry solution to 1-10 DEG C after crystallization; or (3) heating the crystal slurry solution to 2-20 DEG C at first after crystallization and then cooling the heated crystal slurry solution to 2-25 DEG C. Through the technical scheme, recesses in crystal surfaces can be effectively removed, and residues in mother liquid in the crystals are reduced, so that the content of water in the crystals is reduced; moreover, anhydrous citric acid molecules on the crystal surfaces are rearranged in a repair process, so that the quality is effectively improved and readily carbonizable substances are reduced.

The present invention relates to an electron beam processing equipment precision acceleration power supply device and a control method thereof. The electron beam processing equipment precision acceleration power supply device comprises an incoming line filter, a low voltage rectification filtering unit, a DC-DC conversion unit, an inverter unit, a high voltage unit and a regulator, the input end of the incoming line filter is connected with an external power grid, and the output end of the incoming line filter, the low voltage rectification filtering unit, the DC-DC conversion unit, the inverter unit and the input end of the high voltage unit are connected in series orderly, and the high voltage output end of the high voltage unit outputs a high voltage and is electrically connected with the cathode of an electronic gun. A high voltage feedback signal U outputted by the signal end of the high voltage unit is sent to the second input end of the regulator, the first input end of the regulator inputs a high voltage given signal U*, and the output end of the regulator is connected with the signal end of the DC-DC conversion unit. Relative to the prior art, the electron beam processing equipment precision acceleration power supply device and the control method thereof of the present invention utilize a synchronous Buck circuit to regulate the voltage, thereby solving the problem that a light load current generates a peak pulse voltage interruptedly.

The invention discloses a method for producing low-alloy peritectic steel by a conventional slab continuous casting machine. The method comprises the technological processes of decarburization converter smelting, LF refining and slab continuous casting. Through the adjustment on the continuous casting procedures of the conventional slab continuous casting machine, the phenomenon of large liquid level fluctuation during peritectic steel pouring is eliminated, the shock mark depth of a casting blank is obviously reduced, cracks and concave parts in the surface of the casting blank are eliminated, the conventional slab continuous casting machine can produce flawless low-alloy peritectic steel in batches, and high-quality raw materials are provided for low-alloy high-strength steel stable in production performance.

The invention discloses a refill friction stir spot welding method which is characterized in that a circular convex block is arranged at a welding spot of an upper plate of a workpiece; during welding, a hold-down ring of a stirring head is contacted with the upper plate and surrounds the convex block, and a stirring needle and a sleeve are contacted with the convex block; with the application of ultrasonic vibration to positions, on the outer side of the hold-down ring, of the upper plate, a material in a welding zone is plastified through the rotation of the sleeve and the stirring needle, then the sleeve pricks downwards to penetrate through the upper plate and pricks into a lower plate by a certain depth, the stirring needle is drawn back with the downward pricking of the stirring needle, after the sleeve reaches the designed downward pricking depth, the sleeve and the stirring needle return to initial positions, and continue to rotate and press down in the initial positions to allow the surface of the welding spot to be smooth, and after the stirring head stops rotating, an operator continues to apply the ultrasonic vibration for a certain time. According to the refill friction stir spot welding method, by employing the convex block for compensation, a pit of the welding spot produced after the welding can be eliminated; through the ultrasonic vibration, material flowing and material exchange between the upper plate and the lower plate can be improved, and the joint quality is improved; and the operator continues to apply the ultrasonic vibration after the welding, so that the residual stress of the welding spot can be reduced.

A printed circuit board according to the embodiment includes an insulating layer; a first pad on a top surface of the insulating layer; a second pad on a bottom surface of the insulating layer; and a via formed in the insulating layer and having one surface connected to the first pad and an opposite surface connected to the second pad, wherein the via includes a plurality of via parts which are at least partially overlapped with each other.

When etching ONO laminated construction of SONOS parts, the method uses mixed gas of carbon tetrafluoride (CF4) and fluoroform (CHF3) as main etching gas instead of mixed gas of HBr and C2F6, and uses CHF3 as over etching gas instead of mixed gas of CH2F2 / SF6. Using mixed gas of CF4 and CHF3 accomplishes main etching and over etching step for one time so as to simplify etching technique. Based on good etching selectivity and suitable etching speed, the method controls and buffers effect for etching ONO laminated construction by plasma of etching gas. In procedure for etching wafer thin oxidizing layer of grid electrode, the method is capable of controlling etching depth accurately, stopping etching at oxidation surface at low layer of ONO. Moreover, the method eliminates concave phenomena at sidewall and root part of polysilicon gate caused by transversal etching.

The invention provides a method for using dummy grids to manufacture a semiconductor device. The method includes: providing a semiconductor substrate containing a first area and a second area; forming the first dummy grid on the first area of the substrate, and forming the second dummy grid on the second area of the substrate, wherein each of the first dummy grid and the second dummy grid comprises a grid dielectric layer, a covering layer, a grid barrier layer and a grid electrode layer which are sequentially stacked; forming a source drain in the substrate; using wet etching to remove the grid electrode layer of the first dummy grid to form a channel; filling the channel to form a metal grid. By the method, recess, caused by steps such as etching during the dummy grid replacement process, of the surface of the inter layer dielectric (ILD) layer can be eliminated, wider operation range can be achieved, and accordingly device performance and the semiconductor device process are improved.

The invention discloses a bent and insensitive multimode optical fiber. A light guiding interface layer is arranged between a core rod and an outer wrapping layer, a conduit interface layer is formed by a fluoride-doped inner wrapping layer tube arranged on the core rod in a sleeved mode, and the outer wrapping layer wraps the fluoride-doped inner wrapping layer tube. The manufacturing method includes the first step of manufacturing the core rod, the second step of manufacturing the fluoride-doped inner wrapping layer tube, the third step of manufacturing the outer wrapping layer, enabling a silica dioxide porous body to be deposited outside a fluoride-doped transparent silicon dioxide glass tube, and obtaining the outer wrapping layer wrapping a fluoride-doped inner wrapping layer, the fourth step of manufacturing an integral fiber rod, heating a pipe body which is subjected to the third step, inserting the core rod which is manufactured in the first step into the pipe body, and sintering the core rod and the pipe body into a whole to form the integral fiber rod, and the fifth step of carrying out optical fiber drawing. Through the method, the conductivity of an original high-order guided mode in an optical fiber core is enhanced greatly and the bending resistance of the optical fiber is improved effectively; the manufacturing method can be used for accurately controlling the refractive index distribution of the optical fiber, eliminating center sag and improving the properties of the optical fiber.

The invention discloses a bestriding type of dual-wheel motorcycle. The frame of the motorcycle consists of two parallel upper longitudinal beams and two parallel lower transverse bent beams, which are connected to the main tube of the motorcycle head. The rear end of the frame is ream jointed to one flat triangle fork through the flat folk spindle. The upper longitudinal beams have a rear section which gradually declined downward for the purpose of reducing the height of the motorcycle seat. The upper inclined forked tube of the flat triangle fork extends itself along the extending line of the rear section of the upper longitudinal beam. The rear shock absorber, which is horizontally mounted, is parallel with the rear section of the upper longitudinal beam and is located below the seat. The front end and the rear end of the rear shock absorber are beam jointed with the upper longitudinal beam and the flat triangle fork respectively. An air filter is available near the point where the upper longitudinal beam, the lower bent beam connected with the main tube of the motorcycle head. Below this point and on the lower bent beam, a water cooler is equipped. A water-cooling motor is mounted on the suspending device equipped on the frame. The front pedals are mounted on the front turning points, which are near the lower end of the lower bent beam. The two pedals extrude out of the frame on both the right side and left side. These pedals can reduce the height of the seat and improve the shock-absorbing effect and comfort in driving.

The invention relates to a rhomboid wheel-arranged cross-shaped axle 4WD (4 wheel drive) mechanism which comprises four wheels, a driver, suspensions, steering king-pin assemblies and a fore-and-aft steering driving mechanism; and the 4WD mechanism is characterized in that the four wheels (left, right, upper and lower wheels) are rhomboidally arranged at four corners; the left wheel, a left steering king-pin assembly, a left suspension, the driver, a right suspension, a right steering king-pin assembly and the right wheels form a left-and-right steering drive axle; the upper wheel, an upper electric clutch, an upper electromotor, a middle suspension, a lower electromotor, a lower electric clutch and the lower wheel form an up-and-down drive axle; and the left-and-right steering drive axleand the up-and-down drive axle form an intersecting cross-shaped drive axle. By using the 4WD mechanism provided by the invention, the rolling uniformity of the wheels on the road surface is improved; a modularly combined drive mode of an engine and an electromotor is realized; the 4WD mechanism has an antiskid 4WD function; and the initiative steering of the front and rear wheels is realized, thereby improving the accuracy of car motion position control.

The vacuum electron beam welding method for the chromium bronze butt joint of the sandwich structure circular workpiece is to use the first clamping tool to clamp the workpiece, so that the copper backing plate is closely attached to the back of the weld seam of the workpiece, and after the electron beam segmental positioning welding, the workpiece and The first clamping tool is disassembled, and the copper backing plate on the back of the weld is corrected so that the back of the weld and the copper backing plate are closely attached. Use the second clamping tool to clamp the workpiece for formal welding. The second clamping tool allows the chrome bronze butt weld and copper backing plate of the workpiece to be welded through. After welding, the copper backing plate on the back of the workpiece weld is removed by manual grinding. . The invention solves the easy-to-produce depression on the back of the chrome bronze electron beam weld, and at the same time significantly reduces the probability of air holes inside the chrome bronze electron beam weld, so that the first pass rate of the X-ray inspection of the workpiece is significantly improved, and the number of rework welding of the workpiece is reduced , reducing production costs.

The invention belongs to a push handle for a cigarette collecting machine, comprising a push handle main body, a groove is arranged on one side of the push handle main body for pushing cigarettes, a spring is fixed at the bottom of the groove, and a metal frame is connected to the other end of the spring, and inside the metal frame Filled with asbestos pads; the main body of the push hand is provided with a shaft, which passes through the metal frame and the asbestos pad in turn, and bearings are installed at both ends of the shaft, and the two ends of the main body of the push hand are provided with guide rail grooves for bearing movement, and there are gears on the outside of the guide rail grooves. plate. The invention eliminates the dents on the long side of the cigarette and the quality defects of the small inner box caused by the large impact force of the conventional push hand, greatly reduces the probability of scratches, and improves the appearance quality of the cigarette.