14results about How to "Reduce crack defects" patented technology

The utility model discloses a tool for solving the problem of edge cracking in the coating and baking process of a lithium battery negative electrode plate, which comprises a wind shield arranged at an air nozzle of a baking oven, a thinning area positioned on the electrode plate and used for reducing the flow velocity and heat transfer area of convection air, and a heat transfer plate arranged at the air nozzle of the baking oven, the wind shield is of a U-shaped structure, and the wind shield is arranged on the air nozzle of the drying oven in a sleeving manner; the wind shield comprises a bottom plate and two connecting plates, and the two connecting plates are symmetrically arranged on the bottom plate; a connecting hole is formed in the connecting plate; during installation, bolts penetrate through the connecting holes to fix the wind shield to the drying oven, and airflow blown out by a drying oven tuyere is blocked; the convection air speed and the heat transfer area borne by the pole piece thinning area located right above the wind shield are reduced, the drying rate lower than the drying rate of the central area of the pole piece is shown, and the phenomenon of edge cracking is effectively reduced.

The invention belongs to the technical field of electrode paste preparation, and particularly relates to an efficient and environment-friendly electrode paste production process. A composite binder and a corncob powder-lignin composite carbonized precursor are prepared, hexamethylenetetramine-melamine resin is used as a composite cross-linking agent, the rigidity and thermal stability of boron modified phenolic resin in the composite binder are enhanced through a B-O bond, a phenolic hydroxyl group of the boron modified phenolic resin and plant pitch form a hydrogen bond, and the plant pitch is subjected to heat preservation and heat preservation. A hydrogen bond-covalent bond cross-linked network is formed under the action of the cross-linking agent, so that the high-temperature structure stability is guaranteed; the corncob powder fixes lignin through a porous framework, multistage pore channels are formed after carbonization, interface gaps are filled, the lignin is pyrolyzed at a high temperature to generate a carbon nano-whisker reinforced framework, thermal stress can be dispersed, interface bonding can be enhanced, and therefore the compactness and high-temperature stability of the electrode paste are improved. In addition, the bio-based composite binder is adopted to replace traditional petroleum-based asphalt, so that the emission of harmful substances is reduced from the source, and the environmental protection benefit and the high performance of the product are both considered.

The utility model discloses a stainless steel casting forming technical field's a kind of stainless steel casting forming equipment with quick cooling function, including casting mould, the bottom of casting mould is provided with cooling support assembly, cooling support assembly includes heat insulation pedestal, the bottom of one side of heat insulation pedestal is provided with circulating conveying component, circulating conveying component includes input pump box, circulating conveying component is installed in the bottom of one side of heat insulation pedestal, the scheme is arranged cooling support assembly, wherein the quick cooling cavity in heat insulation pedestal is arranged circulating cooling pipeline, and is matched with input pump box and output pump box to form circulating conveying system, can be outside ultra-low temperature cooling medium high-efficiency circulating conveying to pipeline inside, by the contact cooperation structure of metal heat conduction plate and metal heat conduction strip, and the recessed groove design of the matching of casting mould bottom four around and metal heat conduction strip, can be ultra-low temperature evenly conducted to casting mould, optimizes casting cooling process.

The invention discloses a laser cladding repairing method for a heavy-load universal coupling shaft sleeve, which comprises the following specific steps of: 1, preheating the shaft sleeve by adopting a heat treatment furnace at the preheating temperature of 200-250 DEG C, and preserving heat for 4 hours; secondly, a heating belt is wound around the outer circle of the shaft sleeve so that the shaft sleeve can be continuously heated in the cladding process; thirdly, the two symmetrical flat faces of the shaft sleeve are subjected to alternate laser cladding through an inner hole optical head; and fourthly, the shaft sleeve is integrally fed into a furnace for annealing, the annealing temperature is 500-550 DEG C, heat preservation is conducted for 5-7 h, slow cooling is conducted along with the furnace, and after the temperature is lower than 100 DEG C, the shaft sleeve is discharged out of the furnace for air cooling. When the flat surface of the shaft sleeve is cladded, an alternate cladding method is adopted, so that a cladding layer has time to fully release stress to reduce crack defects of the cladding layer caused by stress concentration, and heat preservation and slow cooling of the cladded surface are realized through continuous heating, so that the cladding surface gradually releases stress to avoid cracking of the cladding layer caused by rapid cooling.

This invention relates to the field of photovoltaic cable manufacturing technology, and more particularly to a solar photovoltaic cable and its manufacturing process. The process includes: processing a tin-plated cable core according to a pre-process; extruding the tin-plated cable core through an extruder with preset extrusion parameters to perform a first functional layer extrusion; pre-cooling the extruded cable; determining a second preset pulling speed for the second functional layer extrusion process based on a first excess value when the functionality is deemed unqualified, and further determining a second preset pulling speed based on a first excess value when the functionality is deemed unqualified after the pre-cooling stage; and adjusting the cooling temperature based on a second excess value when the cooling is deemed unqualified, and based on a second excess value when the cooling is deemed unqualified, after the cooling is deemed unqualified. This invention can comprehensively assess the manufacturing quality of photovoltaic cables from multiple dimensions and deeply refine it from a single dimension, and automatically feed back and adjust the parameters for manufacturing photovoltaic cables to improve the stability of the performance and the stability of the manufacturing process of photovoltaic cables.

The present invention discloses a laser deposition manufacturing method for a large wing frame beam combined with topology optimization, which belongs to the field of laser additive manufacturing. The method comprises the following steps: based on the aerodynamic load and fatigue life characteristics of the wing frame beam, the wing frame beam is topologically optimized to obtain an output frame structure; the output frame structure is divided into parts to obtain a main body and a sub-body; the main body and the sub-body are scanned based on a variety of scanning methods to obtain a manufactured main body and sub-body; the manufactured main body and the sub-body are connected by laser additive according to the positional relationship to obtain an integral wing frame beam. The present invention solves the problems of heavy wing frame beams and complex structures, has the effects of structural optimization, lightweight and integration, and improves product quality and production efficiency.

The invention discloses a pipeline all-position automatic welding method and device based on instantaneous heat input control. The method comprises the following steps executed by a welding control system: S1, receiving basic parameters and welding process specifications of a to-be-welded pipe; s2, welding process parameters are matched based on the basic parameters and welding process specifications; s3, a welding torch is controlled to conduct all-position welding on the pipeline based on the welding process parameters, and the instantaneous welding current, the instantaneous welding voltage, the welding speed and the sampling frequency collected by a welding power source are obtained; and S4, instantaneous heat input is calculated according to the instantaneous welding current, the instantaneous welding voltage, the welding speed and the sampling frequency, and the walking speed and position of the welding torch are adjusted in real time based on the instantaneous heat input. According to the scheme, the instantaneous heat input of the pipeline welding joint can be controlled, then the grain size, the phase change conversion and the segregation tendency of a weld nugget area and a heat affected area of a welding seam are controlled, the structure performance of the welding joint is improved, and the welding quality of the pipeline circumferential welding seam is improved.

The utility model discloses a kind of marine engineering thick plate weld rapid preheating device, marine engineering structure thick plate weld rapid preheating device is used to preheat the weld position of thick plate, marine engineering structure thick plate weld rapid preheating device includes main pipe and multiple sub-pipes, wherein, mixed gas is arranged in main pipe;Multiple sub-pipes are connected in parallel in main pipe, multiple gun heads are arranged on each sub-pipe, gun head can output mixed gas as preheating flame, the gun head on adjacent sub-pipe can output preheating flame to the both sides of weld position, for preheating weld position.The marine engineering structure thick plate weld rapid preheating device is heated by multiple gun heads double-side synchronously, solve traditional single-head bake handle temperature uneven problem, reduce weld pore and crack defect.Parallel sub-pipe design expands preheating area, shortens preheating time, applicable to 38mm above thick plate (such as 1.2-3m length thick plate);Main pipe-sub-pipe integrated design reduces gas delivery loss, improves heat energy utilization.

The invention discloses a laser welding preparation process for sealing connection of a multi-cavity aluminum profile of a high-speed rail vehicle, which comprises the following steps: preparation before welding, welding process and post-welding treatment, welding is performed through an arranged outer welding mechanism and an inner welding mechanism in the welding process, the outer welding mechanism and the inner welding mechanism both comprise welding assemblies, the outer welding mechanism further comprises an outer adjusting assembly, and the inner welding mechanism comprises an inner adjusting assembly; the inner welding mechanism further comprises an inner adjusting assembly, the welding assembly comprises a fixedly-arranged limiting barrel, a second fine adjustment barrel is slidably arranged on the inner side of the limiting barrel, a welding fixing barrel is rotatably arranged on the outer side of the second fine adjustment barrel, a rotating disc is rotatably connected to the outer side of the welding fixing barrel, and a bearing supporting plate is slidably arranged on the inner side of the rotating disc. A plurality of electromagnetic coils are arranged on the outer side of the welding end of the laser welding head in a circumferential array motion mode, 8-shaped swing of the laser welding head and a rotating magnetic field of the electromagnetic coils cooperate to conduct three-dimensional stirring on a molten pool, and therefore efficient exhaust and grain refinement are achieved, and the sealing performance and strength of a welding seam are remarkably improved.

The invention discloses a method for preparing precoated sand by using cast steel waste sand, and belongs to the technical field of casting, and the method comprises the following steps: preparing regenerated sand by using the cast steel waste sand, heating the regenerated sand, sequentially adding alumina sol, phenolic resin, urotropine and calcium stearate into the heated regenerated sand in a stirring environment, and mixing to obtain the precoated sand. The method has the beneficial effects that the steel casting waste sand is used for preparing the reclaimed sand, so that the steel casting waste sand is recycled, the production cost is saved, and meanwhile green production is achieved; and the prepared reclaimed sand has the excellent properties of lower expansion coefficient, lower acid consumption value and the like, and can be matched with other components of the precoated sand to generate a better effect during production of the precoated sand.

The utility model relates to the technical field of silicon steel sheet production and processing, and discloses an automatic rotating silicon steel sheet extrusion device which comprises a base, a workbench is fixedly connected to the top wall of the base, an installation block is installed in the middle of the top wall of the workbench, and a hydraulic rod is fixedly connected to the middle of the inner bottom wall of the installation block. A bottom plate is fixedly connected to the output end of the hydraulic rod, sliding columns are fixedly connected to the four corners of the top wall of the bottom plate, square plates are slidably connected to the outer walls of the multiple sliding columns, a fixing column module is fixedly connected to the middle of the top wall of each square plate, and a plurality of fixing blocks are fixedly connected to the left side and the right side of the top wall of the bottom plate at equal intervals; and the inner wall of the fixed block is rotationally connected with a bidirectional pulley. In the utility model, the two-way pulley rotates on the fixed block to enable the other side to jack up the fixed column module again, so that the defects of deformation and cracking caused by non-uniform resistance stress of different parts in the process of separating the die from the bottom die are reduced.

The invention relates to an alloy steel hot-rolled coil plate for a bearing as well as a preparation method and application of the alloy steel hot-rolled coil plate. The coil plate comprises the following components in percentage by weight: 0.95-1.15% of C; 0.15% to 1.30% of Si; 0.20% to 1.20% of Mn; 0.015% to 0.080% of Al; p < = 0.012%; s < = 0.009%; 1.25% to 5.0% of Cr; 0 to 1.00% of Mo; 0 to 0.50 percent of V; 0 to 0.50 percent of Ni; 0 to 0.060 percent of Nb; cu: less than or equal to 0.080%; ti: less than or equal to 0.005%; h: < = 0.0002%; n < = 0.008%; o: < = 0.0012%; as: less than or equal to 0.010%; less than or equal to 0.002% of Pb; ca is less than or equal to 0.003%, and the balance is Fe and impurity elements. The steel has the advantages of good comprehensive performance and capability of meeting the use requirements of the bearing steel.

The invention provides preparation and application of rubber concrete. The rubber concrete comprises the following raw materials: 460-650 Kg / m < 3 > of cement, 300-800 Kg / m < 3 > of aggregate, 350-950 Kg / m < 3 > of rubber particles, 120-170 Kg / m < 3 > of water, 110-350 Kg / m < 3 > of a reinforcing agent and 110-330 Kg / m < 3 > of a water reducing agent. The preparation method mainly comprises a hot method and a cold method, the waste rubber tires are crushed into particles and mixed into the concrete, so that the durability of the concrete is improved, the cyclic utilization of resources is realized, the concrete has remarkable environmental protection significance, and the related construction method has important application value in the building industry. Through reasonable preparation and construction processes, the rubber concrete can significantly improve the durability and environmental protection performance of a building structure, and contributes to sustainable development. With continuous progress of science and technology and improvement of environmental awareness, rubber concrete will play a greater role in the building field in the future.

The present invention discloses a design method for a 3D printed ceramic conformable mold, which specifically includes the following steps: S1, obtaining three-dimensional model data of a part; S2, establishing a block; S3, obtaining a concave block; S4, honeycombing the concave block; S5, obtaining a three-dimensional drawing of a conformable mold; S6, preparing a conformable mold green body; S7, applying a layer of coarse ceramic powder on the concave surface of the conformable mold green body; S8, placing a photocurable 3D printed ceramic part green body on the conformable mold green body; S9, degreasing and sintering; S10, taking it out after cooling to room temperature; S11, separating the sintered ceramic part and the conformable mold to obtain the sintered ceramic part, and the present invention relates to the field of ceramic mold technology. The design method of the 3D printed ceramic conformable mold reduces the deformation of the part size, reduces the structural size error to within ±0.1mm, reduces the crack defects of the part, prevents adhesion to the conformable mold during the sintering process, makes the honeycomb lightweight, reduces material loss, and reduces the weight of the parts inside the furnace.