1114results about How to "Improve processing stability" patented technology

The invention provides an electromagnetic field composite powder feeding type plasma arc additive manufacturing formability regulation and control method and system, and relates to the technical field of plasma arc additive manufacturing. The flowing direction and speed of liquid metal in a molten pool in the deposition process are regulated and controlled through the target composite electromagnetic field, and the morphology and the internal organization structure of a deposition layer are controlled; in the process of regulating and controlling the liquid metal in the molten pool, process parameters and molten pool dynamic image data in the deposition process are collected in real time, and a pre-trained state recognition model is used for conducting self-adaptive adjustment on the process parameters of a subsequent deposition layer; and after deposition of each layer is completed, a laser scanning system is adopted for measuring the actual geometric size and surface appearance of the deposition layer, deposition manufacturing of the next layer is executed based on the optimized composite electromagnetic field control parameters, the corrected layered slicing data and the process path, and the execution is executed circularly till manufacturing of the whole workpiece is completed.

The electrochemical mechanical polishing method and device are characterized in that a workpiece clamping device is adjusted according to the size of the semiconductor wafer and is adsorbed on a pressurizing device, and the semiconductor wafer is connected to a positive electrode of a power supply through a conducting ring to serve as an anode of an electrolysis system; the fixed abrasive pad is fixed on the polishing disc through a conductive adhesive and is connected to a power supply cathode through a conductive ring to serve as a cathode of the electrolysis system; during polishing, a polishing solution is connected with a conductive adhesive for fixing the polishing pad through a through hole in the fixed abrasive pad to form an electrolytic tank path, chemical oxidation and anodic oxidation are carried out on the surface of the third-generation semiconductor wafer during polishing to form a passivation oxide layer with low hardness, and valleys of the passivation oxide layer are passivated and protected. And the peak is quickly removed by the fixed abrasive, so that a polishing mode of anodizing and online removing the surface of the third-generation semiconductor wafer is realized. The method has the advantages of high abrasive utilization rate, high material removal rate, good surface quality, recycling of the polishing solution and the like.

The invention relates to the technical field of semiconductor equipment, in particular to an intelligent electromagnetic interference suppression system for semiconductor equipment. The system comprises a sensor network which is installed at an electromagnetic interference key position of semiconductor equipment, monitors and collects electromagnetic data of the semiconductor equipment in real time, and sends the electromagnetic data to a central data processing module; the central data processing module is used for analyzing the received electromagnetic data, identifying and positioning an interference source based on an interference source positioning model of a machine learning algorithm, performing behavior prediction analysis on the interference source, generating a self-adaptive interference suppression strategy and sending an interference suppression instruction; and the feedback control module is used for executing a feedback control action based on the interference suppression instruction, realizing real-time suppression of multi-level electromagnetic interference of the semiconductor equipment and feeding back a suppression effect. According to the invention, real-time effective suppression of electromagnetic interference is realized, and the process stability and the control precision of semiconductor equipment are remarkably improved.

The invention discloses an intelligent numerical control machining method and system for mold manufacturing, and the method comprises the steps: obtaining a to-be-cut pattern of a mold, planning a milling cutter feeding route, dividing the to-be-cut pattern into a plurality of milling cutter feeding sub-routes, determining milling cutter control tracks composed of spline curves, carrying out the clustering of the milling cutter control tracks, and obtaining a plurality of track sets; and in the milling process, a real-time machining track is collected, a curvature deviation value is calculated, if the curvature deviation value exceeds a preset value, a milling cutter control track is corrected, the milling cutter priority is ranked according to the size of the working radius, and proper track sets are screened out in sequence for milling till all the track sets are machined. Through intelligent path planning and real-time deviation correction, the use efficiency and machining precision of the milling cutter are remarkably improved, and high quality and high stability of mold manufacturing are ensured.

The invention discloses a pure smelting method for nickel-based superalloy, which relates to the technical field of metal smelting and comprises the following steps: (1) screening high-purity raw materials; (2) selecting a vacuum induction melting furnace and carrying out vacuumizing treatment; (3) sequentially adding the pretreated raw materials into a vacuum induction melting furnace, and heating and melting the raw materials; (4) carrying out electromagnetic stirring; (5) preparing special electroslag, and drying and crushing the electroslag; and (6) casting the alloy liquid subjected to vacuum melting into a consumable electrode, inserting the consumable electrode into the slag of the electroslag remelting furnace, and electrifying. According to the design scheme, impurities in the nickel-based superalloy are effectively removed, the purity and uniformity of the alloy are improved, the mechanical property and thermal stability of the alloy are improved, the service life is prolonged, and a better purification effect is achieved.

The invention provides a machine tool multi-body dynamics modeling method and system for a heterogeneous double-five-axis machine tool, and the method comprises the steps: S1, constructing a kinematic chain of the heterogeneous double-five-axis machine tool according to the structural characteristics and motion states of the heterogeneous double-five-axis machine tool; s2, performing three-dimensional modeling on the heterogeneous double five-axis machine tool, and extracting the mass of each component through a model; according to a Nitsche principle-based partition variation method of flexible multi-body dynamics, machine tool kinetic energy and potential energy expressions considering part flexibility are obtained; s3, based on Hertz contact modeling and a contact stiffness theory, establishing a kinetic model of a joint part of each component of the heterogeneous double-five-axis machine tool, and obtaining connection characteristic parameters among the components of the machine tool; and S4, establishing a multi-body dynamic model of the machine tool and solving the model. According to the method, the machine tool multi-body dynamic model is accurately constructed, so that the dynamic behavior in the machine tool movement process is accurately predicted.

The invention provides an auxiliary graph correction method and device, a medium and a product, and the method comprises the steps: determining at least one target edge in an initial layout according to the graph attribute of each graph in the initial layout; a recognition area is constructed with the first edge as the benchmark, and the first edge is any one of the at least one target edge; under the condition that the main graph exists in the recognition area, adding an initial auxiliary graph between the main graph and the first edge; judging whether the initial auxiliary pattern conforms to a preset mask manufacturing rule or not; and if not, correcting the initial auxiliary pattern according to a preset mask manufacturing rule to obtain a target auxiliary pattern. The embodiment of the invention can improve the correction effect of the auxiliary graph.

The invention provides an electrolytic hydrogen production device and an operation method thereof. The electrolytic hydrogen production device comprises a proton exchange membrane flow battery, a first proton exchange membrane electrolytic bath, a second proton exchange membrane electrolytic bath, a positive electrode electrolyte water tank, a negative electrode electrolyte water tank, a methanol storage tank and a control switching device, the proton exchange membrane flow battery is used for performing reversible redox reaction on the positive electrode electrolyte and the negative electrode electrolyte to realize charging and discharging; an anode chamber of the first proton exchange membrane electrolytic cell is used for carrying out oxidation reaction on methanol to obtain methyl formate and hydrogen ions; a cathode chamber of the second proton exchange membrane electrolytic cell is used for reducing hydrogen ions to obtain hydrogen; the positive electrode electrolyte water tank is used for carrying out oxidation-reduction reaction on the positive electrode electrolyte and realizing circulation; the negative electrode electrolyte water tank is used for carrying out oxidation-reduction reaction on the negative electrode electrolyte and realizing circulation; the control switching device is used for controlling the operation mode of the device. The device is high in safety and volatility absorption capacity and large in energy storage capacity.

The utility model discloses a chemical mechanical polishing and planarization system, which at least comprises a polishing head. A plurality of air holes are formed in the lower surface of the hard disc, and a third air cavity communicated with the air holes is formed in the hard disc; at least part of the elastic unit is of an annular structure, the elastic unit is connected with the polishing head body and the hard disc, and a second air cavity is defined by the polishing head body, the elastic unit and the hard disc; a retaining ring; when the third air cavity is in a negative pressure state, the lower surface of the hard disc can make contact with and adsorb the wafer substrate, and the pressure in the second air cavity is controllable, so that the elastic unit is driven to flexibly move, the hard disc and the wafer substrate are assisted to float, and chemical mechanical polishing of the wafer substrate is achieved. The hard drive in the hard disc solves the problem that when the flexible film drives the wafer substrate to polish, the flexible film is pulled to cause fracture or elastic modulus change under the severe polishing condition, and the service life of the flexible piece is prolonged.

The invention discloses a preparation method and application of a heat-resistant halogen-free flame-retardant modified polycarbonate film, and belongs to the technical field of polycarbonate films. Comprising the following raw materials in parts by weight: 80-97 parts of a polycarbonate raw material, 0.05-2 parts of a dispersing agent, 0.3-0.6 part of a sulfonate flame retardant, 0.5-2 parts of an organic silicon flame retardant, 0.2-0.5 part of an anti-dripping agent, 0.05-0.2 part of a dispersing agent, 0.1-1 part of a release agent, 0.05-1 part of an antioxidant and 1-4 parts of black masterbatch. Wherein the dispersing agent and the release agent can improve the processing stability and film forming; the antioxidant can play a synergistic role, so that the oxidation resistance of the film is improved; the black master batch ensures that the film product is lightproof; the organic silicon flame retardant can improve the heat resistance and mechanical property of the film, can play a synergistic role with the sulfonate flame retardant and the anti-dripping agent, enhances the flame retardant property of the film, is stable in performance and not prone to falling off, and has application value in the new energy battery and energy storage industry.

The invention relates to the technical field of machine tool intelligent machining, and discloses a machining method based on deep learning and multi-sensor fusion, which comprises the following steps: collecting data in the machining process of a numerical control machine tool, and preprocessing the data in the machining process of the numerical control machine tool to obtain a data set; inputting the obtained data set corresponding to the data acquired by the plurality of sensors into a Kalman filtering algorithm for Kalman recursive filtering processing to obtain fused actual observation data acquired by the sensors; inputting a data set corresponding to the fused actual observation data acquired by the sensor and the data acquired by the numerical control system into a depth Q network algorithm, and predicting to obtain an optimal tool path; a magnetic field is applied to the machined workpiece through the excitation module; and machining a machined workpiece model along the optimal tool path by adopting an ultrasonic tool high-frequency machining method. According to the invention, the surface quality of the to-be-processed workpiece can be obviously improved.

The invention belongs to the technical field of stator processing, and discloses a stator bar less-glue insulation whole immersion process, which comprises the following steps: S1, early-stage preparation; s2, stator bar pretreatment; s3, binding a less-glue mica tape; s4, dipping treatment; s5, curing treatment; s6, cleaning and detecting; the early-stage preparation comprises material selection and equipment inspection and debugging. According to the method, the excellent performance of an insulating layer is guaranteed from the source through the epoxy resin-based solvent-free impregnating varnish with the accurate proportion, secondly, in the link of binding the mica tape with less glue, the binding tightness and uniformity of the mica tape are guaranteed by accurately setting the speed and tension of a numerical control taping machine, the insulation defect caused by poor binding is effectively avoided, and in addition, the service life of the insulating layer is prolonged. Key technical measures such as pressure impregnation, accurate temperature control and pressure maintaining in the impregnation and curing process further promote sufficient permeation of the impregnating varnish and uniform curing of the insulating layer, and the compactness and the electrical performance of the insulating layer are remarkably improved.

The invention discloses a synthetic method of tris (isopropyl cyclopentadienyl) lanthanum. The synthetic method comprises the following steps: preparing a lanthanum trichloride tetrahydrofuran complex; synthesis of isopropyl cyclopentadiene is carried out; and synthesis of tri (isopropyl cyclopentadienyl) lanthanum. According to the technical scheme, the lanthanum trichloride tetrahydrofuran complex is prepared firstly and then reacts with lithium dimethylamino and isopropyl cyclopentadiene in sequence, and the target product is obtained. Reaction raw materials are simple and easy to obtain, operation is convenient, the safety coefficient is high, the yield is high, and the method is suitable for industrial large-scale production.

The invention discloses a floating deburring tool and a part deburring method.The deburring tool comprises a rod handle, a connecting sleeve, a tool bar, a nut, a clamping sleeve, a tool bit and an adjusting mechanism, the rod handle and the tool bar are connected through the connecting sleeve, the clamping sleeve is clamped to the upper middle end of the tool bit, and the clamping sleeve is fixedly connected to the tool bar through the nut; the upper end of the tool bit sequentially penetrates through the nut and the tool bar and is connected with an adjusting mechanism arranged in the connecting sleeve, and the adjusting mechanism can drive the tool bit penetrating through the tool bar to achieve radial and axial floating along the central axis of the connecting sleeve. By the adoption of the deburring tool and the part deburring method, the burr and flash grinding treatment requirements of different parts can be met, the deburring tool is simple in structure and convenient to assemble and disassemble, and products obtained through deburring are good in consistency, high in efficiency, stable in product machining, high in reliability and suitable for application and popularization.

The invention belongs to the technical field of additive manufacturing, and particularly relates to an additive manufacturing method of an ultrahigh-strength steel-stainless steel interlayer heterogeneous structural part. Comprising the following steps that (1) a model is obtained, and an additive model is designed according to performance requirements needed by a structural part; (2) additive preparation is conducted, specifically, the type and specification of a base plate are selected, mechanical grinding and welding wire filling are conducted on the base plate, an additive path is planned according to the model, and a robot walking program is written; and (3) material adding is started, the optimal technological parameters are matched according to the planned material adding path, and material adding of the structural part is started and completed. The ultrahigh-strength steel-stainless steel heterostructure part obtained through the method has the excellent strength-toughness comprehensive mechanical property, the material adding efficiency is high, the interface of the ultrahigh-strength steel-stainless steel heterostructure part is free of the defects of holes, microcracks, unbonding and the like, and the surface quality is excellent.

The invention discloses a method for electric spark machining of a high-carbon high-chromium molybdenum alloy steel chute, a first group of electrodes is adopted to machine the chute to be machined, the first group of electrodes comprises a first electrode, a second electrode and a third electrode, when the first group of electrodes is adopted to machine each chute, the first electrode is firstly used for rough machining, and then the second electrode is used for machining; carrying out semi-finish machining by using a second electrode, and finally carrying out finish machining by using a third electrode; after a plurality of skewed slots are machined, after a first electrode in a first group of electrodes is abraded, a second group of electrodes is adopted to machine the skewed slots to be machined, the second group of electrodes comprises a second electrode, a third electrode and a fourth electrode, when the second group of electrodes is adopted to machine each skewed slot, the second electrode is firstly used for rough machining, and then the third electrode is used for semi-finish machining; and finally, finish machining is conducted through a fourth electrode. And in this way, after the (n-3) th electrode in the (n-3) th group of electrodes is abraded, the (n-2) th group of electrodes is adopted to machine the chute to be machined, the (n-2) th group of electrodes comprises the (n-2) th electrode, the (n-1) th electrode and the nth electrode, when the (n-2) th group of electrodes is adopted to machine each chute, the (n-2) th electrode is firstly used for rough machining, and then the (n-1) th electrode is used for semi-finish machining, and finally, finish machining is conducted through the nth electrode. The invention aims to improve the processing efficiency and reduce the production cost while ensuring the processing quality.

The invention discloses a patch packaging manufacturing method of a driving power supply and the driving power supply manufactured by the patch packaging manufacturing method. The patch packaging manufacturing method comprises special-shaped surface-mounted pins, a carrier plate, a plastic packaging material and a device. The shapes of the special-shaped surface-mounted pins can be in various shapes (such as an I shape), the special-shaped surface-mounted pins can be made of materials such as a PCB or a resin plated metal structural part or a metal part, and the required number of metal bonding pads are manufactured on the two faces of the special-shaped surface-mounted pins according to application requirements and are communicated. The overall thickness of the special-shaped surface-mounted pins is required to be larger than that of the highest device; the metal bonding pad C 303 of the first surface 301 of the special-shaped surface-mounted pin is welded on the second surface 202 of the carrier plate, and the metal bonding pad D 304 of the second surface 302 of the special-shaped surface-mounted pin is exposed. According to the driving power supply manufactured through the patch packaging manufacturing method of the driving power supply, the flat and small design of the patch power supply is achieved, and the problem that the board arrangement space of high-density small-space equipment is insufficient is well solved.

The invention discloses a process for processing a diamond blind groove by water-guided laser, which not only can optimize a laser incident angle, reduce a scattering effect and improve the smoothness of a groove wall through multi-angle compensation, but also can avoid periodic lines and defects caused by single-direction processing. The laser focus is always matched with the material surface through dynamic angle adjustment, the energy attenuation problem caused by depth increase is effectively relieved, and uniform machining of the bottom of the deep groove is ensured. And a complex multi-taper or gradual change structure can be realized, and the machining flexibility is obviously improved. Meanwhile, heat distribution is improved through multi-angle machining, the influence of heat accumulation on material performance is reduced, a water flow guide field is optimized, machining stability is enhanced, the limitation of the depth-diameter ratio is broken through, and the removal rate and machining precision are improved.

The invention discloses a continuous conveying device for heavy oil cleaning agent production, and relates to the technical field of heavy oil cleaning agent production, in particular to a continuous conveying device for heavy oil cleaning agent production, which comprises a first conveyor and a second conveyor, one end of the first conveyor is connected with a feeding machine in an attached mode. According to the continuous conveying device, the roller structures are arranged on the surfaces of the guide plate and the limiting side plate, when the braking plate enables containers in a machining area to be kept relatively stable, the conveying belt can conduct continuous transmission, workpieces at the front end can continue to be conveyed forwards in order by means of the transmission conveying belt and the roller structures on the two sides of the limiting side plate, stagnation of the containers at the front end is avoided, and the machining efficiency is improved. According to the packing machine, the number of starting and stopping times of the whole conveying equipment is reduced, due to intermittent rotation of the push disc, the containers which are originally tightly arranged are rearranged, an interval which is more convenient to grab is formed between the containers, the grabbing time is shortened, and the packing efficiency is improved.

The invention provides a method for forming an embedded source-drain region. The method comprises the following steps of: covering a semiconductor layer and a gate stack structure to form a sacrificial layer; covering the side wall of the gate stack structure with a sacrificial layer to form an auxiliary side wall; and covering the first device region with a patterned mask layer, etching the second device region by taking the auxiliary side wall and the sacrificial layer as masks to form a sigma trench extending to enter the lower part of the gate stack structure, and simultaneously thinning the sacrificial layer covering the top surface of the gate stack structure of the second device region. According to the forming method, the etching loss of the gate stack structure of the corresponding device region can be reduced, the height difference of the isolation side walls between the PMOS region and the NMOS region is reduced or eliminated, the influence of different etching loads on the subsequent process is avoided, and the process stability is improved on the premise that the process cost and the process complexity are not improved.

The invention provides a workpiece surface residual stress optimization method and device based on multi-parameter collection, and relates to the technical field of cutting machining optimizing.The workpiece surface residual stress optimization method comprises the steps that cutting force data and cutting temperature data are collected through a three-axis cutting force sensor and an infrared temperature sensor respectively, and the feeding speed and the cooling liquid flow are adjusted in real time through a PID controller; secondly, a workpiece residual stress model is established through finite element analysis, and technological parameters are optimized through a genetic algorithm; and finally, in combination with data of a strain sensor, generating stress deviation according to the stress generated by finite element analysis and the actual stress, and further adjusting the cutting force and the cutting temperature through a PID controller based on the stress deviation so as to achieve the purpose of optimizing the residual stress on the surface of the workpiece.

The invention discloses adjustable feeding equipment for stainless steel product machining, and relates to the technical field of stainless steel wafer machining, in particular to the adjustable feeding equipment for stainless steel product machining, which comprises a feeding area and a discharging area, the feeding area is positioned at one end of the discharging area, and the discharging area consists of a discharging base and a steering seat; and a driving steering gear and a driven steering gear are rotationally connected to the interior of the discharging base. According to the adjustable feeding equipment for stainless steel product machining, when a set of coiled plates are discharged to be close to the tail end, raw materials can be mounted on the mounting disc on the other side, then horizontal steering is conducted through the steering base, the production preparation time is further shortened, the bracket can easily jack the coiled materials to the proper height to be parallel to the mounting disc through the first hydraulic jacking cylinder, the mounting steps are simplified, and the production efficiency is improved. The height of the feeding area can be adjusted through a second hydraulic jacking cylinder, the feeding area is accurately in butt joint with external stamping equipment, the position of a limiting plate can be adjusted according to the specifications of the plates, and the plates are prevented from deviating in the conveying process.

The invention relates to the technical field of data processing, and provides an error compensation method, device and equipment for shaft part machining and a storage medium, and the method comprises the steps: obtaining the measurement data of the actual size of a shaft part, calculating the deviation data, inputting the measurement data and the deviation data into a preset neural network compensation model, compensation parameters and machining stability parameters are obtained, the path of a machining tool is adjusted based on the compensation parameters, a target path machining instruction is obtained and subjected to spectral analysis, a corrected instruction is obtained and checked through the machining stability parameters, and the shaft part is machined after the target machining instruction is obtained. The actual size of the shaft part is measured, deviation is calculated, a machining path is adjusted in combination with a neural network compensation model, a machining instruction is optimized through a spectral analysis technology, and the problems that errors of dynamic changes in the machining process cannot be coped with, tremor is likely to occur in the machining process, and the part compensation difficulty is aggravated are solved. And the problem of insufficient real-time error correction exists.

The invention relates to a low-cost composite metal catalyst which is a CuO / ZnO / Al2O3 composite metal catalyst, and the molar ratio of CuO to ZnO to Al2O3 is (6-4): (3-4): (0.5-1). The composite catalyst is prepared by the following steps: adding carbonate into a mixed salt aqueous solution of copper salt, zinc salt and aluminum salt for co-precipitation, grinding a filter cake, and roasting at high temperature. According to the catalyst, 1, 12-dodecanedioic acid dimethyl ester which is low in price and easy to obtain can serve as a raw material, 1, 12-dodecanediol is prepared through catalytic hydrogenation under the milder condition compared with the prior art, high yield and low cost are achieved on the premise that the process condition control difficulty is greatly reduced and the process safety is improved, and the problems that in the prior art, 1, 12-dodecanedioic acid dimethyl ester is synthesized, and the cost is low are solved. The technical problems of high energy consumption, expensive catalyst, harsh reaction conditions and difficult realization of industrial production in the reaction process of 1, 12-dodecanediol in the prior art are solved.

The invention discloses a detachable assembly type building mold, relates to the technical field of building molds, and solves the technical problems that in the concrete forming process, the side pressure on a fixed baffle in the mold can be increased, and formwork deformation and slurry leakage are likely to be caused. Comprising two fixed templates which are installed on a bottom template in a sliding mode, and a base is arranged at the bottom of the bottom template; the supporting and positioning mechanisms are mounted on the base and support the base, and the two supporting and positioning mechanisms play a role in limiting and supporting the two fixed templates; the supporting and positioning mechanism comprises a bottom rail mounted on the upper surface of the base; according to the invention, the two fixed templates can be supported, the pressure of internal concrete on the fixed templates is shared, the deformation amount is reduced, and inward thrust is applied to the fixed templates in the mounting and supporting process, so that the fastening bolts on the side surfaces can be conveniently aligned and connected to adapt to the fixed templates with different heights; and the machining safety and stability of the mold on the concrete prefabricated part are improved.

The invention provides a preparation method of carbon-loaded MOF (Metal Organic Framework) derivative aerogel. The preparation method comprises the following steps: S1, preparing ZIF-67 with a rhombic dodecahedron structure; s2, preparing cellulose aerogel; s3, preparing a ZIF-67 at cellulose compound by using the ZIF-67 with the rhombic dodecahedron structure and the cellulose aerogel; s4, the ZIF-67 at cellulose compound is carbonized, and the carbon-loaded MOF derivative aerogel is obtained. The problems that in the prior art, a wave-absorbing material is poor in performance, does not have good heat insulation performance, and is high in raw material cost are solved.

The invention relates to the technical field of optical fiber processing, and discloses a multi-core-diameter optical fiber ultrasonic cutting system under uniform stress, which comprises a clamping symmetrical assembly, a horizontal tension driving assembly, an ultrasonic cutting assembly and a cutting knife pushing assembly, an optical fiber is clamped through the cooperation of the pressing plate and the clamping assembly base; the clamping assemblies are slidably connected with the horizontal tension driving assembly, the two clamping assemblies are driven by the horizontal tension driving assembly to move reversely, and horizontal tension is applied to the optical fiber, the ultrasonic cutting assembly is slidably connected with the cutting knife pushing assembly, and the cutting knife pushing assembly is arranged on one side of the clamping symmetrical assembly and located between the two clamping assemblies. The cutting knife pushing assembly drives the ultrasonic cutting assembly to move to cut the optical fiber; the optical fiber cutting device can effectively meet the cutting requirements of optical fibers with different core diameters, the flatness of the cut end face is remarkably improved, and burrs and cracks are reduced.

The invention discloses a modified polyethylene groove type building drainage pipe and a preparation method thereof, and relates to the technical field of plastic pipes. The modified polyethylene groove type building drainage pipe at least comprises the following raw materials in parts by weight: 20-30 parts of silane modified polyethylene; 30-50 parts by weight of high density polyethylene; 5-10 parts by weight of talcum powder; 5 to 15 parts by weight of modified basalt fiber bundles wrapped by polydopamine; 1-5 parts by weight of a lubricant; 3-6 parts by weight of a crosslinking accelerator; and 1-2 parts by weight of an antioxidant. The talcum powder and the modified basalt fiber bundles are added into the silane modified polyethylene and high-density polyethylene cross-linked resin, and the obtained groove type building drainage pipe has the advantages of being high in strength, high in toughness, excellent in temperature resistance and long in service life.

The invention discloses a side-flow type electrolytic machining device and method for sealing a casing cavity, an electrolytic machining machine tool comprises a machine tool rotary table and a machine tool spindle, the electrolytic machining device comprises a clamping assembly, a clamping assembly, a clamping assembly and a clamping assembly, the clamping assembly is used for clamping a casing workpiece and fixing the casing workpiece to the machine tool rotary table, and the machine tool rotary table is connected with the positive electrode of a power source; the cathode assembly is connected with the machine tool spindle and arranged on one side of the cartridge receiver in the radial direction of the cartridge receiver so as to form a machining gap with the outer surface of the cartridge receiver, and the machine tool spindle is connected with the negative electrode of the power source; the sealing assembly comprises a sealing sleeve and a pressing mechanism, the sealing sleeve is provided with an inner cavity, a liquid inlet and a liquid outlet, the liquid inlet and the liquid outlet are located on the two sides of the sealing assembly respectively and communicate with the inner cavity, and the sealing assembly is arranged on the cathode assembly in a sleeving mode so that the machining end of the cathode assembly can be located in the inner cavity; the pressing mechanism is used for enabling the sealing assembly to be pressed and sealed on the outer surface of the casing so as to seal the inner cavity, and the liquid inlet is used for introducing electrolyte to flow through the machining gap and be discharged through the liquid outlet.

The invention provides a trench gate silicon carbide transistor structure and a preparation method thereof. According to the invention, the sacrificial oxide layer with a thin film layer grows and is formed on the surface of the polycrystalline silicon layer of the trench gate structure and the surface of the polycrystalline silicon layer of the driving gate structure, so that sputtering metal can be prevented from reacting with polycrystalline silicon when an ohmic contact structure is formed; therefore, the condition that the photoetching and etching processes of the source contact hole and the gate contact hole can use the same photomask can be met; and meanwhile, the sacrificial oxide layer is thin, so that the sacrificial oxide layer can be conveniently removed together when the first metal layer which does not react is removed, and the influence on other film layers is small. The source contact hole and the gate contact hole are simultaneously formed through photoetching and etching by adopting the same photomask, so that the number of layers of the photomask is reduced, the photoetching and etching process time can be saved on one hand, the process manufacturing cost can be reduced, the parameter abnormity caused by external defects can be reduced on the other hand, the process stability is improved, and the production efficiency is improved. Therefore, the production efficiency is improved, and the productivity is increased.