174results about How to "Reduce cooling rate" patented technology

The invention discloses a 3D printing process intelligent control method and system based on real-time feedback, and relates to the technical field of 3D printing, a data acquisition module collects a printing layer surface image and printing data in real time, constructs an image data set and a printing data set, and performs cleaning and standardization processing on the data in a preprocessing module; the image analysis module analyzes surface defects of a printing layer by using a convolutional neural network, generates a defect score D, compares the defect score D with a preset defect score threshold D1, evaluates the state of the printing layer and triggers early warning, and the comprehensive evaluation module calculates a crack generation probability Z by combining printing data and the defect score; and the intelligent control module compares the crack generation probability Z with a preset crack generation probability threshold value Zl, evaluates the printing state and feeds back and controls printing parameters according to a result, so that crack and structure defects in the printing process are effectively prevented and reduced, and the printing precision and the finished product quality are improved.

The invention discloses an injection molding process for a plastic part of an air purifier, and relates to the technical field of injection molding processes. Multi-area dynamic mold temperature adjustment is performed, a plurality of temperature control areas are divided according to the thin wall and curved surface structure characteristics of the plastic part, the temperature is adjusted in real time, stress concentration and deformation are remarkably reduced, and the service life of the plastic part is prolonged. The problem of shrinkage stress of a thin-wall area is solved in a targeted mode, cooling of a thick area is accelerated, meanwhile, real-time temperature control and deformation compensation are controlled in a linkage mode, the temperature and the cooling rate are dynamically adjusted according to deformation data monitored in real time, and the deformation trend is predicted, so that pre-deformation compensation is provided, warping of the thin-wall area and the curved surface area is controlled, and deformation of the thin-wall area and the curved surface area is controlled. The stability of the plastic part in the forming process is kept, and the product precision is improved; in addition, simulation prediction and mold parameter adjustment are carried out, cooling requirements of different areas are adjusted, the temperature difference between the thin wall and the curved surface area is reduced, and the whole cooling process is more efficient.

The invention belongs to the technical field of laser processing, and particularly relates to a multi-mode laser coupling high-efficiency and high-quality additive manufacturing method for a metal-based composite material, which comprises the steps of pretreatment, substrate pretreatment, multi-mode coupling laser construction, additive manufacturing and the like. High-power pulse laser is adopted as energy supply main laser to melt the metal matrix composite wire, meanwhile, flowing of a molten pool is accelerated, the nucleation rate is increased, and metal matrix composite parts are machined through the additive manufacturing method. The continuous laser is adopted to effectively slow down the cooling speed of the molten pool, and the residual tensile stress generated in the component due to rapid solidification of the molten pool is greatly reduced. Oscillating laser is adopted to improve the shape of a molten pool and reduce the number of times of transverse lap joint. According to the method, multi-mode laser coupling and cooperation with the flat-topped laser light source are utilized, and the metal-based composite material machining part with the uniform and flat surface appearance macroscopically and the stable and uniform organization structure microcosmically is obtained.

The invention relates to an annealing-free alloy cold heading steel wire rod for a 12.9-grade bolt and a production method of the annealing-free alloy cold heading steel wire rod. The production process comprises the steps of molten iron pre-removal of P / S, electric furnace or converter smelting, external refining, bloom continuous casting, rolling into an intermediate billet and steel billet finishing, intermediate billet heating, high-pressure water descaling, rough rolling, intermediate rolling, pre-finish rolling, finish rolling, spinning, coil collecting and cooling. The annealing-free alloy cold forging steel wire for the 12.9-grade bolt comprises the following components in percentage by mass: 0.30%-0.35% of C, 0.10%-0.30% of Si, 0.70%-1.20% of Mn, 1.0%-1.5% of Cr, 0.15%-0.30% of Mo, 0.015%-0.030% of Al, 0.0030%-0.0080% of N, 0.01%-0.04% of Nb, less than or equal to 0.30% of Ni, less than or equal to 0.10% of Cu, less than or equal to 0.015% of P, less than or equal to 0.010% of S, less than or equal to 0.012% of (As + Sb + Bi), less than or equal to 0.0010% of O and the balance of Fe and inevitable impurity elements, the niobium-nitrogen product (Nb * N) is greater than On the premise that main alloy components are not reduced, a fine grain structure can be obtained under a certain condition by adding grain refining elements, and the delayed phase change effect the same as that of a low-temperature finish rolling process is achieved by utilizing the delayed phase change characteristic of the fine grain structure.

The invention discloses an aluminum alloy extrusion forming production process, which relates to the technical field of extrusion production, and comprises the following steps: designing an extrusion die, carrying out surface heat treatment on the extrusion die, selecting an aluminum alloy material, heating and extruding, carrying out surface treatment processing on a produced aluminum alloy profile, and packaging the aluminum alloy profile after the aluminum alloy profile is inspected to be qualified. Compared with the prior art, the method has the advantages that the grain structure of the profile can be more uniform and refined by accurately regulating and controlling the complex relation among parameters such as the extrusion temperature, the mold temperature, the extrusion speed and the lubricating condition, so that the mechanical property is enhanced, like a 6063 aluminum alloy profile, the tensile strength can be improved, the yield strength is improved, deformation or damage in the using process is effectively avoided, and meanwhile, the service life of the profile is prolonged. Good parameter matching can effectively reduce internal defects of the profile, metal can flow in a mold more smoothly, internal pores, cracks and other defects caused by non-uniform metal flow are reduced, and the surface quality is greatly improved.

The utility model discloses a laser welding device with a shielding gas heating function, which comprises a laser welding module, a shielding gas heating module is arranged on one side of the laser welding module, the shielding gas heating module comprises a cavity, the cavity is provided with a gas inlet and a gas outlet, a heating rod is arranged in the cavity, and the shielding gas heating module is arranged in the cavity. The air outlet is connected with an air supply pipe, and an outlet of the air supply pipe is arranged below a laser vibration mirror of the laser welding module. According to the utility model, nitrogen reaching a working procedure can be heated in advance, so that the consistency of the temperature of protective gas is ensured; and meanwhile, the shielding gas heating device has a temperature adjustable and controllable function, and the optimal temperature of the shielding gas can be confirmed by discussing the influence of the shielding gas at different temperatures on gas holes and cracks after welding, so that the cooling speed after welding is slowed down, the gas escapes from a molten pool, the probability of generating the welding cracks and the gas holes is reduced, and the welding quality is improved.

The utility model provides a hot galvanizing strip steel edge heating device, and relates to the technical field of hot galvanizing strip steel production, the hot galvanizing strip steel edge heating device comprises a shell, strip steel, an air supply assembly and two air knives, the strip steel penetrates through the shell, and the left side and the right side of the strip steel are each provided with a heating assembly, a first adjusting assembly and a second adjusting assembly; by arranging the heating assembly, the cooling speed of the strip steel edge coating can be slowed down, so that the phenomenon that the strip steel edge coating is too thick is prevented, the strip steel quality is guaranteed, the heating assembly can heat the strip steel edge from the upper side and the lower side at the same time, the heating uniformity is improved, and the heating effect is improved; by arranging the first adjusting assembly, the distance between the first air outlet pipe and the second air outlet pipe can be adjusted according to actual use requirements so as to adapt to strip steel of different thicknesses, and the use stability is improved; and by arranging the second adjusting assembly, the distance between the two heating assemblies located on the left side and the right side of the strip steel can be adjusted according to actual use requirements so as to adapt to the strip steel with different widths, and the use stability is improved.

The invention discloses a casting cylinder body preparation method. The casting cylinder body preparation method comprises the following steps that 1, the bottom of a plunger hole in a cylinder body is sealed; 2, the copper alloy and the casting cylinder body are sintered; step 3, cooling the cast cylinder body; according to the method, through a segmented cooling mode, casting defects such as shrinkage porosity and shrinkage cavities are avoided, copper-steel bimetal metallurgy diffusion bonding is achieved, it is guaranteed that a copper alloy layer has good mechanical and tribological properties, and therefore the service life of the copper-steel bimetal cylinder body is prolonged.

The invention discloses a method for achieving titanium-aluminum alloy additive manufacturing through an electron beam spot melting process. The method comprises the steps that firstly, after a three-dimensional CAD model of a target product is established, layering slicing is conducted; 2, preheating and heat preservation of the substrate; 3, spreading powder and preheating a powder bed; 4, additive manufacturing process parameters are set, powder melting and solidification are carried out point by point, and a single-layer solid sheet layer is obtained; 5, carrying out secondary preheating treatment on the powder bed and descending the forming platform; and 6, repeating the process to obtain the titanium-aluminum alloy. A discrete point melting technology is adopted to replace a traditional line scanning continuous melting technology, point melting and solidification are carried out on a target area in a powder bed one by one, the size of a molten pool is reduced, the cooling speed of the molten pool is increased, the heat affected zone range of the edge of the molten pool is reduced, the influence time of the heat affected zone is shortened, and the uneven structure caused by aluminum element volatilization and phase change is avoided; and meanwhile, single-process printing of the titanium-aluminum alloy complex part is achieved, the difficulty and cost of the additive manufacturing process are reduced, and the method is suitable for the field of titanium-aluminum alloy additive manufacturing.

The invention discloses an intelligent crankshaft machining machine tool, and relates to the technical field of crankshaft multi-station machining. Grooving and mounting are integrated, machining of different steps is achieved through station switching, the problem that time is wasted due to continuous switching of workpieces is solved, the machining efficiency is improved, multiple gears are mounted outside a crankshaft at a time through the multi-gear mounting mechanism, the multiple gears are heated, cooled and mounted at the same time, and the machining efficiency is improved. Batched heating, cooling and mounting are not needed, the mounting efficiency of the multi-gear crankshaft is greatly improved, the gears are automatically rotated, the clamping grooves of the gears are in butt joint with the protrusions, the positions of the clamping grooves do not need to be manually adjusted when the gears are placed, the adjusting time is shortened through automatic adjustment, the mounting efficiency is improved, and the mounting efficiency is improved. The gear is heated before being mounted, the inner diameter of the gear is increased, butt joint mounting of the gear is facilitated, and the problem that mounting is difficult due to slight dislocation during automatic butt joint is solved.

The soft plasma arc combined laser-MIG composite welding device comprises a mounting plate, a soft plasma arc welding gun, a laser welding gun head and an MIG welding gun are sequentially mounted on the mounting plate, and the soft plasma arc welding gun and the MIG welding gun can be horizontally, vertically and rotationally adjusted on the mounting plate; the soft plasma arc welding gun forms an upper end shielding gas channel, the upper end of the upper end shielding gas channel is connected with a shielding gas pipe connector, a lower end shielding gas channel, an annular shielding gas cavity and a round hole are formed in the gas nozzle, and the round hole vertically penetrates through the interior of the annular shielding gas cavity to the exterior of the gas nozzle. Compared with the prior art, through the synergistic effect of the soft plasma arc welding gun, the laser welding gun head and the MIG welding gun, the welding penetration depth is increased, the welding speed is increased, the occurrence of welding defects is reduced, and the welding quality is improved. And the welding quality and the welding efficiency are improved.

The invention relates to the technical field of metal welding, and discloses a welding process of high-strength medium alloy carburizing steel, which comprises the following steps: preheating the whole weldment to 200-250 DEG C before welding; the overall temperature of a weldment is kept at 200-250 DEG C in the welding process; and after welding is completed, a weldment is integrally heated to 250-300 DEG C, and heat preservation is conducted for preset time. According to the scheme, a new preheating technology in the welding technology is provided for the high-strength medium alloy carburizing steel, overall preheating is adopted before welding, during welding and after welding instead of local preheating, the temperature ranges before welding and during welding are kept consistent, the temperature range after welding is slightly higher than the temperature ranges of the first two stages, it is advantageously kept that the temperature of a mother part in the whole welding stage is stable and uniform, and the welding quality is improved. The temperature gradient in the whole welding process is reduced to the minimum, and through appropriate process steps and welding parameters, it is guaranteed that weld joints do not have welding defects, and meanwhile the mechanical property requirements of products are met.

The invention discloses cutter handle resistance welding equipment and a welding process, and relates to the technical field of PCB cutter machining. The device comprises a welding table, machining bases, vibration discs, a heating box and a grinding mechanism, the two machining bases arranged in a mirror image mode are fixed to the table top of the welding table, the vibration discs are fixed to the positions, located on the inner sides of the machining bases, of the table top of the welding table, and the heating box is fixed into a first groove, a second groove and a third groove which communicate with one another; and a group of uniformly distributed No.2 heating pipes are fixed in an inner cavity of each side box plate of the heating box. The preheating box is additionally arranged at the feeding part, the cooling speed after welding can be reduced, cracks are prevented from being generated, welding stress is reduced, welding defects are reduced, the workpiece quality is improved, excessive time and procedures are not consumed, the production efficiency is improved, in addition, after-heat treatment can be conducted on the welded workpiece, hydrogen escape is facilitated, delayed cracks are prevented, and the welding quality is improved. And the welding quality is further improved.

The invention relates to the technical field of metallurgy, in particular to a heat treatment process for improving the HIC resistance of a Q345R (HIC) steel plate, which comprises the following steps of: heating the steel plate to 30-50 DEG C above AC3, keeping in-furnace time for more than or equal to 30 minutes, and then cooling in two stages: in the first stage, quickly cooling, namely cooling to Ar1 temperature at the speed of 25-30 DEG C / s; in the second stage, the cooling speed is reduced, and cooling is conducted to the Bs temperature at the speed of 2-5 DEG C / s; and then air-cooling to room temperature. The phase change degree of the steel plate is controlled by adopting a two-stage cooling mode, so that the final structure of the steel plate is changed, the purposes of reducing the banded structure and improving the acid resistance of the Q345R (HIC) steel plate are achieved, and good social and economic benefits are achieved.

The invention discloses a control method for eliminating staggered layers of the end face of an aluminum foil after annealing, which comprises the following steps: S1, slitting an aluminum foil roll to ensure that the coiling density of the aluminum foil roll is controlled at 2.45-2.55 kg / m; s2, the slit aluminum foil coil is put into a furnace to be subjected to oil removal annealing, and the cooling speed of an annealing cooling section is required to be smaller than or equal to 3 DEG C / h; and S3, the aluminum foil coil is taken out of the furnace and placed in a cooling area, the cooling area is covered with a heat preservation cover, the difference between the temperature of the aluminum foil coil and the environment temperature of the cooling area cover is smaller than or equal to 40 DEG C, and the cooling rate of the aluminum foil coil is smaller than or equal to 4 DEG C / h. According to the method, the internal and external temperature difference of the aluminum foil roll is smaller than or equal to 5 DEG C, the shrinkage speed difference of the aluminum foil roll during cooling is reduced, deformation stress concentration in the cooling shrinkage process is reduced, and therefore axial sliding between layers of the aluminum foil is reduced, and end face staggered layers of the aluminum foil roll are eliminated.

The utility model discloses a top cover structure with high sealing performance, which belongs to the technical field of electric kettles and comprises a top cover, a hollow rubber ring is arranged on the outer side of the top cover in a surrounding manner, and an air cavity is vertically formed in the middle of the inside of the top cover. The hollow rubber ring is arranged on the outer side of the top cover, the suction mechanism composed of the air cavity, the piston, the spring, the through hole, the pull rod and the pull block is arranged on the inner top of the top cover, and the hollow rubber ring is communicated with the interior of the air cavity through the guide hole, so that in the process that the pull block is held by hand to lift the top cover, the top cover can be conveniently sucked. Due to the gravity influence of the top cover, upward movement of a piston can be controlled, air in a hollow rubber ring is sucked into an air cavity, the hollow rubber ring is in a compressed state, the top cover can be conveniently taken out, after the top cover is placed, the air in the air cavity can be injected into the hollow rubber ring through the reset effect of a spring, and the air in the air cavity can be conveniently taken out. The hollow rubber ring is expanded to be attached to the inner wall of the kettle opening, and the sealing effect in the using process is improved.

The invention relates to a ventricular drainage device, and belongs to the technical field of medical instruments, the ventricular drainage device comprises a controller, a drainage tube and a drainage bag, and further comprises a fixing frame; a pushing mechanism; a limiting mechanism; a knocking mechanism; and a kneading mechanism. Through cooperative use of the pushing mechanism and the limiting mechanism, in the process that the drainage tube conducts drainage on liquid in the brain of a patient, a pushing plate of the pushing mechanism intermittently extrudes the drainage tube under the limiting effect of the limiting mechanism, and when the movement direction of the pushing plate is the same as the flowing direction of the liquid drained in the drainage tube, the pushing plate can push the drainage tube to move. When the drainage tube is blocked, the pushing plate extrudes the drainage tube, so that the pushing plate extrudes and pushes blockages adhered to the inner wall of the drainage tube in the drainage direction, the probability that the drainage tube is blocked is reduced, the drainage tube is prevented from being blocked, the flowing speed of liquid in the drainage tube is prevented from being reduced, and the intracranial pressure of a patient is prevented from being increased, so that the drainage smoothness is ensured; and the patient is well protected.

The invention belongs to the technical field of laser welding, and discloses a medium-thickness plate welding process without beveling, three groups of laser arrays are adopted for welding, the first laser array completely covers a butt joint gap to generate a stable molten pool with shallow depth and large melting area, and the second laser array melts and gasifies materials to form a deep melting key hole. The third laser array acts on the rear wall of the deep melting key hole to maintain the opening state of the key hole, and the third laser array, the first laser array and the second laser array jointly act to form a Y-shaped large key hole; due to the fact that the three sets of laser arrays are adopted for parallel machining, the total welding input energy can be accurately controlled, large-penetration-depth single-time welding of pure laser is achieved, and meanwhile the problems of welding deformation and incomplete penetration during multi-pass welding are solved; the to-be-welded workpiece does not need to be beveled in advance, the workpiece does not need to be cleaned before welding, and the welding efficiency can be effectively improved.

The invention relates to an additive manufacturing high-temperature alloy printing piece and a preparation method thereof, and relates to the technical field of additive manufacturing. According to the main technical scheme, the preparation method of the additive manufacturing high-temperature alloy printing piece comprises the following steps that selective laser melting forming treatment is conducted on high-temperature alloy powder, and a sedimentary state additive manufacturing high-temperature alloy printing piece is obtained; wherein the technological parameters of the selective laser melting forming treatment are set as follows: the laser power is 220 to 260 W, the scanning interval is 0.03 to 0.05 mm, the scanning rate is 1000 to 1100 mm / s, the layer thickness is 30 to 50 [mu] m, and the light spot diameter is 150 to 180 [mu] m. The method is mainly used for preparing the additive manufacturing high-temperature alloy printing piece with the obliquely-grown columnar crystals.

The invention relates to the technical field of metal plastic forming, and provides a thin-wall deep barrel forming die with local protrusions, the thin-wall deep barrel forming die comprises a fixing plate, a die body, a cleaning assembly and a measuring assembly, the die body comprises an upper die set and a lower die set, and the lower die set comprises a lower die plate fixedly connected to the top of the fixing plate through bolts; a lower die mounting block is fixedly connected to the top of the lower die plate, a lower die positioning block is fixedly connected to the top of the lower die mounting block, a backing ring is fixedly connected to the top of the lower die positioning block, and a blank and the lower die are preheated through the heating device, so that thermal stress generated by sudden temperature change in the forming process is avoided; the product quality is improved, the service life of the die is prolonged, meanwhile, the cooling speed after the blank is put into the die is reduced, and it is ensured that the blank keeps stable in the forming process.

The utility model relates to a kind of cement stabilized macadam mixing devices of admixture recycling powder, it is related to recycling powder mixing technical field, including pre-stirring cooling cylinder, the top of pre-stirring cooling cylinder is provided with feed inlet, the inside opposite side between pre-stirring cooling cylinder is all provided with stirring assembly, the outer surface wall of pre-stirring cooling cylinder is provided with annular body, the top of annular body is provided with annular rack;Beneficial effect: by pre-stirring cooling cylinder, aggregate and recycling powder can be first stirred and mixed by stirring assembly, the heat absorption capacity of aggregate is reduced recycling powder temperature, then by fan device, the inside of pre-stirring cooling cylinder can be blown and cooled, water component is used to let the spray head body can be conveniently sprayed to carry out cooling treatment, which can accelerate the cooling efficiency of recycling powder, as far as possible can save time, and the cement stabilized macadam mixing efficiency is improved.

The invention discloses an automobile plate laser cutting device for solving round hole burrs, and relates to the technical field of laser cutting, the automobile plate laser cutting device comprises a machining clamping unit, a laser cutting unit and a control unit, and the laser processing unit is arranged on the surface of the movable plate, the laser processing unit comprises a laser rod, the bottom of the laser rod is fixedly connected with a cutting head, and the surface of the laser rod is rotationally sleeved with a sealing column cavity. The rotating control part is started to drive the sealing column cavity to rotate on the outer side of the laser rod through the synchronous belt and the synchronous wheel, so that when the sealing column cavity rotates, the laser rod drives the sealing column cavity which is clamped on the surface of the cutting head and is in a rotating state to move when the cutting head transfers, cuts and draws a circle to form a circular hole; the inclined surface shoveling block on the inner side of the sealing column cavity can shovel molten metal sealed by the sealing column cavity in the rotating movement process, so that the volume of the molten metal is reduced, and burrs are reduced.

The utility model discloses an auxiliary heating structure of an injection mold, which comprises a heating rod arranged in a fixed mold core, the heating rod penetrates through a cavity of the fixed mold core, and a space between a bulge structure in the cavity and the inner side wall closest to the bulge structure in the cavity is set as a heating section needing to be heated. The projection of the heating section in the depth direction of the cavity of the fixed mold core is partially or completely overlapped with the projection of the heating rod in the depth direction of the cavity of the fixed mold core, the cavity penetrates through the top wall of the fixed mold core to form a discharging port for taking out a product, the heating rod is located on the side, away from the discharging port, of the fixed mold core, and the heating rod is detachably connected with the fixed mold core. According to the utility model, the overall temperature is high when the injection molding material flows to the fusion position, so that the fusion position is not easy to form a fusion line.

This invention relates to a temperature control device for a battery pack in a new energy bus, comprising a battery box, several module boxes arranged side-by-side in the middle of the inner side of the battery box, several battery cells arranged side-by-side in the module boxes, a heat spreader plate embedded in one inner wall of one side of the module box, several heat exchange tubes embedded inside the module box and abutting against the heat spreader plate, an insulation tank on one side of the outer side of the battery box, a heat exchanger on one side of the insulation tank, and an air conditioner on one side of the heat exchanger. The air conditioner is connected to the heat exchanger and the insulation tank respectively through refrigerant pipes. A water pump is installed at one end of the insulation tank. In winter or low-temperature environments, it collects heat from the air, heating the water in the insulation tank to hot water. In summer or high-temperature environments, it releases heat to the air through the heat exchanger and cools the water in the insulation tank to cold water, so that the battery cells can be maintained between 20 and 30 degrees Celsius in various temperature environments, so that the working efficiency of the battery cells can be optimized.

The utility model discloses edge-thickened leakage-proof aluminum tableware, which belongs to the technical field of tableware and comprises a box body, a leakage-proof mechanism is arranged in the box body, a cover body is arranged above the box body, and a sealing mechanism is arranged between the cover body and the box body. The anti-scalding assembly is arranged, the bottom end of the box body is movably placed in the heat insulation sleeve box, the heat insulation sleeve box moves along with the heat insulation sleeve box to be attached to the side wall of the external connection ring, the water injection pipe penetrates through the external connection ring through the penetrating hole, then the sealing cover is screwed to the water injection pipe, a user holds the heat insulation sleeve box to move and take the box body subsequently, and it is avoided that in the moving and taking process, the heat insulation sleeve box is damaged. Heat of food in the box body is transferred to the hands of a user, in cold weather, the sealing cover is taken down from the water injection pipe in a rotating mode, then hot water is injected into the heat insulation sleeve box through the water injection pipe, heat preservation operation can be conducted on the food in the box body through the hot water, and the cooling rate of the food in the box body is slowed down in cooperation with the heat preservation effect of heat preservation cotton. And the taste of food is ensured.

The utility model discloses a rapid cooling device of a catalyst reaction kettle, and relates to the technical field of reaction kettle cooling. The rapid cooling device of the catalyst reaction kettle comprises the reaction kettle, a storage ring is fixedly connected to the outer surface of the reaction kettle, the interior of the storage ring is hollow, a conveying box is arranged on the outer surface of the reaction kettle, the interior of the conveying box is also hollow, and an annular cavity is formed in the side wall of the reaction kettle; a spiral cooling pipe is arranged in the reaction kettle, fixing rods are fixedly connected to the inner walls of the upper side and the lower side of the reaction kettle correspondingly, the two fixing rods are fixedly connected with the spiral cooling pipe correspondingly, the upper end of the spiral cooling pipe penetrates into the conveying box, and a first water pump is arranged in the storage ring. The contact area with internal materials can be increased through the spiral cooling pipe arranged inside, meanwhile, the contact interval between material circulation and the inner wall is compensated, and therefore the overall cooling efficiency is effectively improved.

The invention relates to a bridge steel structure welding device and method, and belongs to the technical field of welding, the bridge steel structure welding device comprises a foundation trench, a first covering layer, a third covering layer and a first isolation groove, the foundation trench is placed on a foundation and used for being filled with a first filling layer, and the first filling layer is used for supporting a top plate; the first covering layer is used for covering the top plate when the top plate is welded and is used for absorbing and conducting heat generated by welding; the third covering layer is used for covering the bottom plate when the bottom plate is welded and is used for absorbing and conducting heat generated by welding; the first isolation groove is connected to the abutted seam of the two adjacent top plates and the abutted seam of the two adjacent bottom plates and used for isolating a welding seam between the top plates and a welding seam between the bottom plates. The first filling layer, the first covering layer and the third covering layer are all formed by laying a plurality of heat-conducting particles; the technical problem that in the prior art, the mechanical property is reduced after welding due to the fact that heat cannot be evenly distributed when a large-thickness steel plate is welded can be solved.

The invention discloses low-yield-ratio Q355B structural steel and a production process thereof, and relates to the technical field of steel production, and the low-yield-ratio Q355B structural steel comprises the following chemical components in percentage by mass: 0.10%-0.20% of C, 0.10%-0.35% of Si, 0.60%-1.60% of Mn, less than or equal to 0.030% of P, less than or equal to 0.025% of S, 0.005%-0.020% of Nb, 0.010%-0.030% of Ti, 0.020%-0.050% of Al and the balance of Fe and inevitable impurities.

The utility model relates to steel ingot casting technical field especially no step heat preservation cap mouth structure, it includes mud cap mouth, iron cap mouth and heat preservation cover. Mud cap mouth is conical, and the inner chamber adopts octagonal plum blossom shape taper structure, and the taper range is 0.8% 1.5%, iron cap mouth includes circular ring and lug, and is installed in close cooperation with mud cap mouth, heat preservation cover is composed of stone wool heat preservation board and metal sheet, and covers in the periphery to reduce the cooling rate. The utility model discloses through optimizing the inner chamber shape and cancelling step structure, reduces stress concentration and slag inclusion defect, significantly improves the billet yield, is applicable to electric furnace ingot and other metal ingot casting process.

The present invention discloses a device for solving the burr problem of circular holes in laser cutting of automobile plates, which relates to the technical field of laser cutting and comprises: a processing clamping unit, which comprises a frame; a laser processing unit, which is arranged on the surface of a movable plate, and comprises a laser rod, the bottom of which is fixedly connected with a cutting head, and the surface of which is rotatably sleeved with a sealing column cavity. The rotary control member is started, so that the rotary control member drives the sealing column cavity to rotate on the outside of the laser rod through a synchronous belt and a synchronous wheel, and then the cutting head is combined with the moving cutting when the sealing column cavity rotates, so that when the cutting head transfers the cutting circle to form a circular hole, the laser rod drives the rotating sealing column cavity clamped on its surface to move, so that the inclined shovel block on the inner side of the sealing column cavity can remove the molten metal sealed by the sealing column cavity during the rotating movement, thereby reducing the volume of the molten metal and the formation of burrs.