55results about How to "Guaranteed forming quality" patented technology

The invention relates to a porous structure manufactured through laser powder bed melting additive manufacturing, in particular to a gradient porous structure with excellent mechanical property and functionality and an LPBF self-adaptive input manufacturing method of the gradient porous structure. According to the method, basic geometric parameters and gradient characteristics of the gradient porous structure are defined by utilizing Grasshopper parameterization design software. A gradient porous structure with excellent mechanical properties and functionality is generated through a grasshopper plug-in of software, and smooth transition from a solid state to a porous state is achieved. An LPBF technology is adopted and combined with an angle partitioning strategy, the gradient porous structure is melted layer by layer, the gradient porous structure is partitioned according to the strut suspension angle on the basis of optimizing process parameters, the optimized process parameters are applied to a model of the partitioned region, and the gradient porous structure is obtained. Scanning of each layer of the overhanging supporting columns at different angles is in appropriate laser parameter input, and the problems of deformation and high porosity caused by heat accumulation in the LPBF process are effectively solved.

The invention relates to an elevation control and precise regulation and control method for frozen sand mold additive manufacturing in a time sequence space. According to the method, a mathematical model that the thickness of floating sand changes along with time due to moisture heat exchange of the frozen sand mold in air is established, and the thickness of the floating sand of frozen sand molds with different curved surfaces under the parameter conditions of different environment temperatures, time scales, sand mold materials, moisture contents and the like is predicted and fed back; and in the freezing printing process, real-time adhesive and height compensation is carried out on sand molds at different wall thicknesses, and the dimensional precision and geometric precision of the frozen sand molds are protected to a certain extent. According to the method, the problem of dimensional accuracy error caused by floating sand generated by heat exchange in air in the manufacturing and subsequent placing processes of the frozen sand mold is effectively solved, and the dimensional accuracy of the sand mold during casting is ensured.

The invention discloses an in-situ control device and method for inhibiting metal additive manufacturing cracking, and belongs to the technical field of metal additive manufacturing. According to the device, the two propelling structures are arranged on the two sides of the core base plate with the transverse gap, the two propelling structures make contact with the core base plate from the two sides of the core base plate correspondingly, so that in the additive manufacturing process, the two propelling structures assist in extruding shrinkage of the core base plate from the two sides of the core base plate; and it is ensured that the shrinkage speed of the core substrate can be matched with the shrinkage speed required by the formed part. The device disclosed by the invention is a device for regulating and controlling the local structure deformation of the substrate in situ, and the local deformation of the substrate is regulated and controlled in real time in the additive manufacturing process, so that the distribution and evolution of a stress field are regulated, the tensile stress is successfully converted into the pressure stress, and the generation and expansion of cracks are effectively inhibited.

The invention discloses an automatic argon arc welding clamp for a high-temperature alloy sheet metal part of a wallboard assembly and a clamping method. A front end seam allowance in a positioning ring and a rear end seam allowance in a first ventilation ring jointly restrain the circumferential size of the wallboard assembly; the pressing hook and the end face of the positioning ring as well as the pressing plate and the end face of the first ventilation ring are jointly pressed to control and restrain the axial size of the front and rear mounting edges of the wallboard assembly, and an inert gas protection system composed of the first ventilation ring, the second ventilation ring, the hose, the first tee joint and the second tee joint controls argon arc welding seam back forming protection. The clamp and the method improve the welding seam quality and the welding efficiency. The inert gas protection device with the first ventilation ring, the second ventilation ring and the hose is adopted, the forming quality of the back of the weld joint is guaranteed, atmospheric condition welding is achieved, and the welding efficiency is greatly improved.

The present invention discloses a laser additive manufacturing scanning path area planning method considering overhang feature recognition, taking the three-dimensional model file of the part as the object, dividing the triangular facets into a set of overhang triangular facets and a set of non-overhang triangular facets; marking the overhang edge and establishing the overhang edge index when the tangent segment is intersected, and by traversing the slice contour, the slice contour line segment of the overhang mark is offset to the internal area of ​​the slice contour; the offset line segment contour is used as a dividing line to further divide the overhang area and the non-overhang area, and the laser additive manufacturing scanning path planning is performed on the overhang area and the non-overhang area. The present invention identifies and extracts the overhang triangular facets based on the three-dimensional model file information, and then divides the overhang area of ​​the two-dimensional slice contour, and performs path planning by deciding the appropriate scanning method for the feature area and the non-feature area, thereby ensuring the forming quality of the overhang structure of the part.

The invention relates to the technical field of assembly tools for deformed parts, in particular to a flaring self-locking nut mounting tool. The flaring self-locking nut installation tool comprises a main seat body, a nut limiting seat and a flaring punch, a flaring driving mechanism used for driving the flaring punch to move is arranged on the main seat body, the nut limiting seat is provided with a limiting part opposite to the flaring punch in the flaring punch moving direction, and the limiting part is used for being arranged on a thread sleeve section of a flaring self-locking nut in a sleeving mode. A pre-pressing structure is arranged on the main seat body and comprises a pressing part and a pressing driving mechanism used for driving the pressing part to move towards the side where the limiting part is located. The pressing part is used for being pressed on the side face, opposite to the anti-rotation section of the flaring self-locking nut, of the part so as to be matched with the limiting part to clamp the anti-rotation section of the flaring self-locking nut and the part to achieve pre-fixing, and the situation that the nut inclines and the installation quality is affected due to the factor that an operator exerts force on the installation tool when holding the installation tool is not likely to happen.

The application discloses a forming method for concave thin plate corrugated stainless steel parts, which comprises die assembling, stamping buffer layer laying, stamping preforming, stamping forming and shearing correction. By using the forming method, the existing punch is used, in the stamping preforming process, the stamping buffer layer is laid, the step-by-step pressing mode is adopted, the stamping buffer layer can control the material flow problem, so that the material uniformity is achieved; in the stamping forming, the die is replaced, and the one-time pressing forming is adopted, which can effectively solve the technical problem that the boundary of the corrugated area is prone to wrinkling, and can improve the forming efficiency, so as to improve the qualified rate of part forming, ensure the product forming quality, greatly reduce the processing cost, and be applied to the processing of the parts prone to wrinkling, and is convenient to operate and suitable for popularization and application.

The application discloses a kind of real-time regulation and control laser additive manufacturing alloy method based on online ultrasonic monitoring, which uses ultrasonic sensor to track the back wall reflection of laser forming sample in the process of laser additive manufacturing, and can accurately reflect the generation of crack and pore in the process of laser forming by processing ultrasonic signal data, and adjusts the laser forming process parameters in real time according to feedback data, to obtain the laser additive manufacturing alloy sample without crack and pore finally.The method provides a method for real-time monitoring and regulating alloy forming quality in the process of laser additive manufacturing, which significantly improves the laser forming quality of the formed alloy.

The invention discloses a heat dissipation pipe bending forming device, relates to the technical field of heat dissipation pipe machining, and aims to solve the technical problems that in the prior art, the interior of a pipeline is difficult to support, so that the defects of wrinkles, section distortion and the like are easily generated in the bending process of the pipeline, and the machining quality of the heat dissipation pipe is limited. Comprising a control cabinet and a driving disc arranged outside the control cabinet. Flexible support can be provided for the interior of the heat dissipation pipe in the mode that liquid is injected into the heat dissipation pipe, wrinkles and section distortion of the pipe in the bending process can be avoided, meanwhile, due to the fact that the pressure of a liquid medium acting on the inner wall of the pipe is the same in all directions, the forming quality can be guaranteed, defects are reduced, and the production efficiency is improved. Due to the supporting effect of the liquid medium, the wall thickness changes of the inner side and the outer side of the pipe in the bending process are relatively uniform, the wall thickness thinning and thickening phenomena are reduced, and then the effect of guaranteeing the quality of the heat dissipation pipe machined by the device is achieved.

The invention relates to the technical field of laser machining, in particular to a laser machining device and method with a curved surface part positioning mechanism, a curved surface part is arranged below laser machining equipment, and a track recognition module used for conducting track recognition on a machining area of the laser machining equipment is installed on one side of a welding frame body; curved surface positioning modules which are uniformly distributed are mounted above the positioning base plate, curved surface parts are arranged above the curved surface positioning modules, and a curved surface part cooling module is further mounted above the positioning base plate; a curved-surface part cooling module is mounted on the upper surface of the positioning base plate, and when surface machining is conducted on a curved-surface part, a second controllable lifting unit drives an attaching hose to move upwards; the attaching hose is of a flexible structure, heat is taken away through a cooling medium circulating in the attaching hose, rapid cooling and shaping of a welding area are achieved, molten metal liquid is made to be formed along a preset track, and the machining precision and the forming quality of the curved surface part are guaranteed.

The invention provides automatic forming equipment for a copper sheet lead of a transformer, which belongs to transformer production and comprises a workbench, a supporting bottom plate is arranged above the workbench, a supporting plate is arranged on the supporting bottom plate, a cotton clamping mechanism and a roller group are arranged on the supporting plate, and the copper sheet lead is arranged in the cotton clamping mechanism and the roller group in a penetrating manner; a wire feeding mechanism and a lead pre-bending mechanism are arranged at one end of the roller group, the roller group, the wire feeding mechanism and the lead pre-bending mechanism are linearly and sequentially arranged, and two groups of supporting plates are arranged on the supporting bottom plate; a lead pressing machine, a lead flattening and cutting mechanism and a blanking mechanism are arranged on the supporting bottom plate, and the lead flattening and cutting mechanism and the blanking mechanism are both located on one side of the lead pre-bending mechanism. According to the equipment, the cotton clamping mechanism, the roller group, the wire feeding mechanism, the lead pre-bending mechanism, the lead pressing mechanism, the lead flattening and cutting mechanism and the blanking mechanism are sequentially arranged on the supporting bottom plate, and automatic forming of the copper sheet lead is realized through cooperation of the mechanisms, so that the labor cost is reduced, and the working efficiency is improved.

The utility model relates to the technical field of charging pile processing, in particular to a paint spraying device for charging pile processing, which comprises a supporting bottom plate, a storage barrel and a liquid inlet funnel, a uniform mixing mechanism is arranged in the storage barrel, and a uniform paint spraying mechanism is arranged on the side edge of the uniform mixing mechanism. The paint spraying device comprises a uniform paint spraying mechanism, a rotating control mechanism is arranged on the side edge of the uniform paint spraying mechanism, and a stable positioning mechanism is arranged on the side edge of the rotating control mechanism. The whole device can well achieve a good stabilizing effect on charging piles of different sizes and specifications, meanwhile, fixed spraying of the charging piles is changed into rotary spraying, the charging piles can be well sprayed, meanwhile, compared with single-face one-by-one spraying, a large amount of spraying time is saved, the overall structural design is ingenious, the application range is wide, and the practicability is high. And the practical effect is good.

The utility model discloses a kind of prevention and control reinforcing structure of shield segment floating, for the construction of tunnel, the inner wall of tunnel is connected by multiple shield segments, including several sleeve valve pipes, several sleeve valve pipes are fan-shaped and arranged on shield segment;It further includes detection assembly, the detection assembly is set between the two adjacent shield segments, detection assembly includes detection rod and the measuring piece being set on detection rod, and measuring piece is used to measure the relative inclination angle between the two adjacent shield segments. Diffusion type one-way grouting is carried out through the pipe wall hole of sleeve valve pipe, the sleeve valve pipe outer wall and the soft soil layer of the annular area can be combined into one after slurry solidification, to prevent segment floating. The inclination angle of sleeve valve pipe is detected by detection assembly, when the relative inclination angle between the two adjacent shield segments reaches preset inclination angle, sleeve valve pipe can inject mud again between corresponding shield segment and the inner wall of tunnel, to accurately inhibit the floating of shield segment.

This invention relates to the field of automated welding technology, specifically to an automated welding fixture and method for laser wire-filler welding of circumferential welds. The fixture includes a laser welding torch, a rotating system, and a control system. The laser welding torch is equipped with a wire feeding mechanism and is fixed on the welding torch support of the rotating system. The rotating system consists of a motor mechanism, a rotating support, and a rotating base. The rotating base includes a welding torch support, an XY bidirectional fine-tuning slide, a rotating platform, and a bearing assembly. This invention uses a motor-driven rotating mechanism to rotate the welding torch at a uniform speed, ensuring that the laser spot and wire feeding position are always aligned with the center of the circumferential weld. The control system coordinates the adjustment of laser power, wire feeding speed, and rotation speed to achieve automated welding of the circumferential weld.

The present invention discloses an in-situ self-resistance heating-magnetic pulse bending forming process and device, which relates to the field of metal plastic processing and forming technology. The bending forming process includes the following steps: placing the grid rib wall panel workpiece to be processed on the forming die, and fixing and clamping it by the edge clamping block, and suspending the driving blocks mutually above the grid rib wall panel workpiece; the grid rib wall panel workpiece is heated and softened to the target heating temperature by self-resistance heating; the driving block moves at high speed under the action of strong Lorentz force and hits the grid rib wall panel workpiece to bend and deform it; the grid rib wall panel workpiece is taken out after natural cooling. The present invention utilizes the Joule heat effect and the pure electroplastic effect to improve the bending formability of the titanium alloy grid rib wall panel, and sets a driving block of a specific structure embedded with the rib plate, thereby increasing the forming action area and the Lorentz force while further improving the forming effect, solving the problem of low electrical conductivity of the titanium alloy wall panel, and enhancing the deformation efficiency at the same time, avoiding instability during the bending process of the rib plate.

A mining butterfly chain chaining tool die comprises a chaining die, an ejector and an extrusion roller. The chaining mold comprises an upper mold and a lower mold which can be butted together; the upper end face of the upper die is provided with a first groove, the front end of the upper die is provided with a first protrusion, the first protrusion and the front end of the upper die form a first arc-shaped part, the upper end face of the lower die is provided with a second groove, the front end of the lower die is provided with a second protrusion, and the second protrusion and the front end of the lower die form a second arc-shaped part. The end face of the first protrusion and the end face of the second protrusion are in butt joint and attached, so that the first arc-shaped part and the second arc-shaped part form an arc-shaped groove for shaping the vertical ring forging material, and the first groove and the second groove form a sinking groove for positioning the butterfly-shaped flat ring. The ejector directly faces the sinking groove of the chaining mold; and the extrusion rollers are symmetrically mounted on two sides of the chaining die. By means of the special butterfly chain chaining combined die which is specially designed, it can be guaranteed that the process requirement can be met during chaining, and the forming quality of products is guaranteed.

The present invention discloses an electromagnetic impact heterogeneous metal plate composite stamping integrated forming device and method, the device comprises: a bottom die, the upper end of which is provided with a forming surface, and the forming surface is provided with an inward concave groove; a pressing electrode, which is movable and movable above the bottom die, is used to press the edge of the upper metal plate and electrically heat the upper metal plate; an upper die, which is movable and movable above the bottom die, and the bottom is provided with a pressing surface adapted to the forming surface; an electromagnetic pulse coil, which is installed on the upper die, is used to apply a high-speed electromagnetic impact load to the upper metal plate and the lower metal plate, so that the upper metal plate and the lower metal plate are interface-compounded under the coupling of high temperature and high-speed electromagnetic impact, and at the same time bulge toward the groove together, and the composite metal plate is fitted with the groove wall of the groove. The present invention realizes the heating of metal parts, the composite of heterogeneous materials and multiple stamping, shortens the process flow, improves production efficiency, has a short process flow, low energy consumption, good composite interface strength, and high forming accuracy.

The invention discloses a thin-wall part with a supporting structure used in a laser powder bed melting additive manufacturing thin-wall cavity, and belongs to the technical field of powder bed melting additive manufacturing. The thin-wall part comprises a thin part main body internally provided with a cavity, the cavity is flat, and a supporting main body is arranged in the cavity; the supporting body is of a rib structure which is reserved in a boundary track after Boolean operation is conducted between a honeycomb structure formed by ribs and the boundary track formed at the maximum cross section of the cavity, the rib structure comprises a main rib part and a boundary rib part, and the main rib part is of a plurality of hexagonal structures defined by the ribs. The boundary rib parts are a plurality of opening rib structures which are located in the boundary track and close to the boundary track; the method is favorable for controlling the deformation of the thin-wall surface and the high-precision and effective forming of the thin-wall cavity part; after the powder bed is melted, residual powder in the cavity can be cleaned, the influence of residual powder agglomeration or caking caused by subsequent heat treatment can be avoided, the part forming quality is guaranteed, and the part performance is improved.

The utility model belongs to the field of municipal engineering, and particularly relates to a manual hole digging pile retaining wall pouring device which comprises two supporting plates, a discharging bin is fixed to the two supporting plates, the discharging bin is downwards connected with a discharging pipe, and the discharging pipe is downwards connected with a plurality of extension pipes. A chute A is lapped above the blanking bin, and the upper part of the chute A is supported by a supporting rod; the device further comprises a chute B, an upper cover plate is arranged on the upper portion of the chute B, a material receiving hole is formed in the upper cover plate, the extension pipe extends into the material receiving hole, the upper portion of the chute B is downwards and fixedly connected with a rotating column, the rotating column is inserted into a sleeve, and the sleeve is fixed to the base; handles are arranged on the two sides of the lower portion of the chute B, a supporting column is downwards arranged on the bottom face of the lower portion of the chute B, universal wheels are arranged at the bottom end of the supporting column, and the chute B rotates to pour concrete into the wall protection formwork. Concrete can be continuously poured into the formwork, the construction efficiency is greatly improved, the retaining wall forming quality is guaranteed, the labor amount of workers is reduced, and unsafe factors in traditional construction are avoided.

The invention relates to a thread rolling wheel control method and system, computer equipment and a storage medium. The initial meshing moment is calculated, and initial dynamic parameters of the thread rolling wheel are set in combination with workpiece characteristics, so that the thread rolling wheel enters a controlled state before contact, and instant impact caused by no control or extensive control is avoided. Meanwhile, in the initial meshing process, data of a driving unit and a response sensor are obtained in real time, the dynamic sensing capacity for the contact state (including stress change and contact rigidity) is established, the system can adjust the feeding speed and / or preloading force in a self-adaptive mode according to the actual meshing condition, and flexible transition from initial slow feeding to steady-state rolling is achieved.

The invention provides a construction method of a material pressing surface of a stamping part, a computer program product and computer equipment, and the construction method of the material pressing surface of the stamping part comprises the following steps: constructing an initial plane material pressing surface for the stamping part; calculating point cloud coordinate data of the stamping part through the initial plane material pressing surface; calculating a control point set in XZ and YZ planes of a stamping coordinate system according to the point cloud coordinate data; constructing section lines in XZ and YZ planes according to the control point set; and an actual material pressing surface is formed based on scanning of the two section lines.

The invention discloses an in-situ self-resistance heating-magnetic pulse bending forming technology and device, and relates to the technical field of metal plastic processing and forming. The bending forming technology comprises the following steps that a to-be-treated grid rib wall plate workpiece is placed on a forming female die and is fixedly clamped through a blank pressing block, and the to-be-treated grid rib wall plate workpiece is subjected to in-situ self-resistance heating-magnetic pulse bending forming; driving blocks are mutually suspended above the grid rib wall plate workpiece; the grid rib wallboard workpiece is subjected to self-resistance heating to be heated and softened to the target heating temperature; the driving block moves at a high speed under the action of strong Lorentz force and impacts the grid rib wall plate workpiece to bend and deform the grid rib wall plate workpiece; and the grid rib wallboard workpiece is taken out after being naturally cooled. The bending formability of the titanium alloy grid rib wall plate is improved through the Joule heating effect and the pure electroplastic effect, the driving block which is embedded with the rib plate and is of a specific structure is arranged, the forming effect is further improved while the forming action area and Lorentz force are increased, the problem that the titanium alloy wall plate is low in conductivity is solved, meanwhile, the deformation benefit is enhanced, and the service life of the titanium alloy grid rib wall plate is prolonged. And instability of the rib plate in the bending process is avoided.

The application discloses a large-diameter corrugated pipe precision forming die and process, relates to the technical field of corrugated pipe dies, and comprises an upper die base, a lower die base and middle die pieces, the middle die pieces are provided in groups, the end portions of each group of middle die pieces are connected with hydraulic cylinders through connecting rods, the hydraulic cylinders are installed below the lower die base, guide columns are arranged on the lower die base, the upper ends of the guide columns are connected with the upper die base, the guide columns are provided in two, and the two guide columns are connected with the upper die base and the lower die base through guide sleeves. The large-diameter corrugated pipe precision forming die and process adopt the above structure, the position control mode of the die pieces is coordinately controlled through laser sensors, the peak position can be accurately detected, corrugated pipes with different wave heights can be formed, the adaptability is good, the position movement of the die pieces is realized through the control of the hydraulic cylinders, the die pieces are flexibly moved, the peak positions are consistent when the die is closed, the problem of low wave form precision of the corrugated pipe in the forming process is solved, the forming efficiency is improved, and the forming quality is ensured.

The invention discloses a powder cleaning method for a thin-wall part of a cavity structure based on laser powder bed melting additive manufacturing, and belongs to the technical field of powder bed melting additive manufacturing. The powder cleaning method comprises the following steps that based on the laser powder bed melting additive manufacturing technology, a supporting mechanism is arranged in the cavity structure, and the cavity structure is supported by the supporting mechanism; the thin-wall part with a cavity structure is manufactured, and a fluid flowing channel used for communicating the interior of the cavity structure of the thin-wall part with the exterior of the thin-wall part is arranged on the supporting mechanism; a plurality of powder discharging holes are formed in the thin-wall part, threaded structures used for being connected with the outside are arranged in the powder discharging holes, and the fluid circulation channel communicates with the outside of the thin-wall part through the powder discharging holes. A thin-wall part provided with a powder discharging hole is installed on a base plate of a rotating table, a powder suction pipe and a plurality of powder blowing pipes are installed according to the position of the powder discharging hole, powder remaining in a cavity of the part can be cleaned after a powder bed is melted, the influence of residual powder agglomeration or caking caused by subsequent heat treatment is avoided, and the powder feeding efficiency is improved. The part forming quality is ensured; and the part performance is improved.

The utility model discloses a driving shaft supporting structure of a vertical ring rolling mill. According to the device, an overall moving frame is in an inverted L shape, a first supporting structure is arranged at the bottom of the middle position of the overall moving frame, a supporting frame is vertically arranged at the bottom of the right side of the overall moving frame, and a second supporting structure is arranged at the bottom of the supporting frame; the third supporting structure is arranged at the left bottom of the integral moving frame; the first supporting structure comprises a first bearing mounting cylinder and a first rolling bearing, and the main body part of the driving shaft penetrates through the first rolling bearing; the second supporting structure comprises a second bearing mounting cylinder and a second rolling bearing, and the tail end of the driving shaft penetrates through the second rolling bearing; the third supporting structure comprises a third bearing mounting cylinder and a third rolling bearing, and the head end of the driving shaft penetrates through the third rolling bearing; and the centers of the first supporting structure and the second supporting structure are collinear. The horizontal state of the driving shaft in the working process can be kept, the problem that the outer wall of a formed ring piece is inclined is solved, and the forming quality of the ring piece is guaranteed.

The invention provides an electric arc fuse additive manufacturing slender rod structure forming method and system, and the method comprises the steps: 1, determining a raw material wire for forming and used corresponding process parameters, and carrying out base forming through unified welding by using a preset wire feeding speed; 2, the position of a welding gun is adjusted through a six-axis robot, and the distance between the center position of the tail end of the welding gun and the workpiece is 10-12 mm; 3, the attitude angle coordinate of a welding gun is adjusted to be parallel to the slender rod forming direction; 4, the surface temperature of the rod body is monitored in real time through an infrared camera, and when the average surface temperature of the slender rod is lower than 70 DEG C, the step 5 is executed; and 5, the slender rod structure is formed in the forming direction, and the step 2 to the step 5 are executed repeatedly till the slender rod is formed. According to the method, large-angle inclined slender rod structure forming can be achieved originally, the appearance is smooth and complete, and the forming quality is good.

The invention relates to the technical field of bolt forging, in particular to a bolt forging combined tool and a using method.The bolt forging combined tool comprises a rack, a hydraulic cylinder and a supporting rod and further comprises a movable die assembly, an electromagnetic coil, a top plate, a fixed die assembly, a transmission assembly, a connecting assembly and a side groove, the movable die assembly is connected with the hydraulic cylinder, and the hydraulic cylinder extends to the inner side of the movable die assembly; the electromagnetic coil is installed between the inner walls of the rack, the top plate is installed on the top of the rack, and the fixed mold assembly is rotationally installed at the bottom of the top plate. The corresponding top dies are sequentially switched in the ascending process of the blank along with the bottom die, and the blank is subjected to secondary heating before entering the corresponding top dies to make up heat loss of the blank, so that the problem that the blank needs to be transferred for multiple times when a single blank is forged in a three-pass forming mode is solved; and the problem that the forging efficiency of the brake lever bolt is low due to the fact that the strain uniformity becomes poor due to temperature reduction in the blank transferring process and secondary heating is needed is solved.

The invention discloses an electron beam welding method for thin-wall ultrahigh-strength steel D506A. The electron beam welding method comprises the specific steps of part cleaning, assembling, demagnetizing, welding, post-welding treatment and inspection. Wherein the welding steps comprise positioned welding, preheating, deep penetration welding, first modification welding and second modification welding in sequence, and all the steps are completed in a vacuum electron beam welding machine. According to the thin-wall ultrahigh-strength steel D506A electron beam welding method, by optimizing electron beam welding parameters and controlling the interlayer temperature, the cooling speed of welding is reduced; meanwhile, the defocusing electron beam is used for preheating the to-be-welded position for a certain time, cold cracks can be avoided, the hardness of a heat affected zone can be reduced, and the plasticity of a connector can be improved; and moreover, a deep penetration welding bead is covered through two modification welding processes for surface covering, so that the forming quality of a welding seam is ensured, the problem that cracks are easily generated in thin-wall ultrahigh-strength steel D506A electron beam welding is solved, and the use requirement of a solid rocket engine is ensured.

The application provides a heat exchange plate, a heat exchange plate pair, a core plate bundle and a heat exchanger. The heat exchange plate comprises a plate body, a plurality of corrugated protrusions inclined to the length direction of the plate body are arranged on the plate body, and a through strip-shaped flow channel is formed between adjacent corrugated protrusions. A supporting protrusion is arranged on the top surface of the corrugated protrusion. Two heat exchange plates are stacked to form a heat exchange plate pair. In the heat exchange plate pair, the supporting protrusions of the two heat exchange plates are arranged in abutment, and the number of intersection points of the projections of the corrugated protrusions of the two heat exchange plates is greater than the number of the abutting supporting protrusions. The heat exchange plate, the heat exchange plate pair, the core plate bundle and the heat exchanger provided by the application have the advantages of simple structure, convenient manufacturing, high heat exchange efficiency, effective alleviation of the scaling and wall sticking of impurities in wine, improvement of the quality of wine, and prolongation of the cleaning cycle.

The invention provides a springback measurement and control method for an impact hydraulic bulging branch pipe, which comprises the following steps: S1, positioning and mounting a mold, mounting a pipe in the mold, and setting optimal bulging parameters according to the characteristics of the pipe and historical experimental data; s2, parameter setting is conducted based on XTDIC system measurement software, and three-dimensional deformation of the pipe in the bulging process is monitored; s3, marking to obtain three-dimensional coordinates and coordinate displacement of the key point of the bulging part; displacement data are transmitted to a PLC program in real time, and the springback displacement and the direction of the springback displacement are obtained; and a PID control logic is constructed, and the material supplementing amount of the punch is adjusted. According to the method, the PID control algorithm is utilized, according to the calculated error, the mode of continuously obtaining the actual bulging value, generating the control signal and adjusting the material supplementing amount in the control cycle is adopted, accurate springback control is achieved, the pipe forming quality is ensured, the whole process depends on experiments and experience to optimize PID parameters, and the optimal control effect is achieved.