51results about How to "Eliminate welding distortion" patented technology

The invention relates to an axle housing assembly welding technique and a special clamp, belonging to welding machining technique and equipment field. A head seat 2 is connected with a tail seat 9 respectively through a guide rail and a machine body 1. An axle housing assembly balance-support device 5 and an axle housing assembly central positioning device 6 are connected with the machine body 1 through a connecting key. A support left-clamp body 3 and a support right-clamp body 8 are respectively connected through connecting keys with the head seat 2 and the tail seat 9. The support left-clamp body 3 and the support right-clamp body 8 are respectively connected with a hydraulic power device and a compressing device. The welding technique is that assembling is done first and point-welding is carried out for fixing, then the axle housing assembly is welded. In the welding process of the invention, a difference between the size between a round support and an axle housing body and the size of the drawings is preserved when in point-welding according to the distortion rule of welding, and after welding the size is eventually equal to that on the drawing through welding distortion.

The invention discloses a full-automatic assembling-welding system for an electric conduction assembly of a low-voltage plastic-shell circuit breaker. A rotating disc assembly is arranged on a horizontal table facet and comprises an inner disc and an outer rotating disc. The lower end of the inner disc is connected with a scale division mechanism. A first driving mechanism, a second driving mechanism, a third driving mechanism and a fourth driving mechanism are arranged on the upper surface, close to the outer edge, of the inner disc. Twelve clamp assemblies with the consistent structure are uniformly arranged on the outer rotating disc along the circumference. The twelve clamp assemblies are uniformly arranged as twelve rotating stations and are in one-to-one correspondence with feeding mechanisms, discharging mechanisms, a welding mechanism and a detector which surround the circumference of the rotating disc assembly. The structure is compact, the working efficiency is high, and the welding quality of a product is stable.

The invention discloses a thwartship bulkhead subsection guide rail frame preassembling process which comprises the following steps of: 1, manufacturing a tyre frame (1); 2, fixing a thwartship bulkhead rear wall (2) on the tyre frame (1), wherein the thwartship bulkhead rear wall (2) is formed by splicing a plurality of thwartship bulkhead rear wall boards; 3, welding a frame (3) on the thwartship bulkhead rear wall (2); 4, covering and adhering a thwartship bulkhead front wall (4) on the frame (3), and respectively fixing the thwartship bulkhead front wall at a plurality of points; 5, releasing the fixation of the tyre frame (1) and the thwartship bulkhead rear wall, turning the thwartship bulkhead front wall (4) and the thwartship bulkhead rear wall (2), welding the frame (3) and the thwartship bulkhead front wall (4) together; and 6, installing a guide rail frame. The invention eliminates the welding deformation caused by two-splicing folding, reduces the workload of subsection turning, and decreases the deformation of thwartship bulkhead subsections, which is caused by turning.

The invention discloses a press machine body welding deformation eliminating method based on residual stress quantitative analysis. The method includes the following steps: (1) determining a primary welding path, (2) performing numerical simulating analysis of the welding process on the structure of a machine body, (3) acquiring the residual stress of each unit node position of each welding seam and the deformation caused by the residual stress, (4) performing correction processing on an original welding path of a component of the machine body, (5) performing numerical simulation of the welding process according to the corrected path, (6) acquiring the welding residual stress after the path is corrected and the shape after the deformation, and making comparison with the initial path, (7) detecting whether the residual stress generated after the path is corrected and the welding deformation meet requirements of welding accuracy of the machine body, (8) if the accuracy requirements are met, designing the welding path of the press machine body, and (9) if the accuracy requirements are not met, continuing to perform the welding path processing and the numerical simulation until the accuracy requirements are met. The press machine body welding deformation eliminating method based on the residual stress quantitative analysis can reduce the effect on machine body quality caused by welding deformation, achieve optimization of the welding path and promote welding accuracy.

The invention discloses a method and a device for welding a drill pipe body for rotary drilling and outer keys. The method comprises the following steps of: a preheating step: preheating a welding area (13) between the drill pipe body (11) and each outer key (12); a welding step: welding the welding area (13) between the drill pipe body (11) and each outer key (12) to form a welding seam; and a post-heating step: heating the welding seam formed between the drill pipe body (11) and each outer key (12) after the welding step. The invention also discloses a device for welding the drill pipe body for the rotary drilling and the outer keys, which comprises a preheating unit (3), a welding unit (2) and a post-heating unit (4). By the technical scheme, the cold breaking phenomenon during the welding process of the drill pipe body and the outer keys can be effectively avoided. In addition, the welding stress and the welding deformation of the drill pipe body and the outer keys, caused after the preheating step and the post-heating step, can be effectively eliminated.

The invention relates to a girder machining method and a girder machining device for a crane and a crane span collecting-mounting method. The girder machining method for the crane comprises the following steps of step 1, welding girder hanging plates onto corresponding positions of two ends in the length direction of the girder, and enabling the side faces of the girder hanging plates to face the outside of the length direction of the girder; step 2, placing a girder bracket onto a corresponding girder support, fixing by a girder fixing device on the girder support, and utilizing corresponding machining equipment to machine a pressing plane used for being pushed and matched with corresponding matching faces on end beams; step 3, machining thread connecting holes penetrating through the girder hanging plates along the thickness direction in set positions of the girder hanging plates; finally, jointing the end beams with the girder and fixing the end beams and the girder by bolts. By adopting the technical scheme, the collecting-mounting quality of a crane span is prevented from being influenced by welding deformation.

The invention discloses a welding method of a super-thick steel casting. Process steps include S1, preparing a joint: an asymmetric X-type groove is adopted; S2, preheating: the front side and the reverse side are uniformly heated, the preheating temperature is set within the range of 150-160 DEG C, and the heating rate does not exceed 100 DEG C / h; S3, back welding: gas shielded welding backingis carried out on flux-cored welding wires for three layers, and fire warming is carried out to remove stress after each weld seam is welded; S4, reverse side air gouging: air gouging back chipping and carburized layer removal are carried out; S5, reverse side back welding: back welding is carried out by three layers after the temperature of the steel casting reaches a preheating temperature according to the method described in the step 2, and fire warming is performed on each weld seam to remove stress; S6, filling and cover surface welding: the front side and the reverse side are welded respectively by one welder simultaneously and symmetrically, and hammering is carried out layer by layer after each layer of weld beads of each weld seam is welded; and S7, 550 DEG C *2h heat treatment after stress removal is carried out immediately after the completion of welding. By means of the method, welding stress and welding deformation can be significantly reduced, and the probability of generating steel casting welding cracks is greatly reduced.

The invention relates to a manufacturing method of a ramp steel box girder. The manufacturing method comprises the following steps that segmented modeling is performed on the ramp steel box girder byusing three-dimensional modeling software, and components on each bridge segment are lofted to determine the cutting shape of each component; and a plurality of height-adjustable supporting columns are arranged in a tailor-welded area in an array mode, modeling is conducted on a supporting column array on the three-dimensional modeling software, and the distance between each supporting column anda bridge deck slab is obtained to determine the supporting height of each supporting column, so that the bending shape of the plate face of the spliced bridge deck slab is made to be the same as the bending shape of the road face of a designed ramp. According to the manufacturing method of the ramp steel box girder, accurate discharging of all components is achieved, overturning and positioning ofall sections of bridge deck slabs are achieved through the supporting columns, and it is guaranteed that the forming shape of the bridge deck meets the design requirement; the deformation area is corrected in advance, the influence of welding deformation on the whole is eliminated, and rapid butt joint of construction sites is achieved by reserving the positioning matching parts; and the application of the steel box girder to ramp approach bridges is realized, and the development of the steel box girder in the field of bridges is facilitated.

The invention provides a tool beneficial for large circular pipe welding and welding deformation control and an implementation method of the tool. The problem that in the prior art, due to the fact that the one-time percent of pass of circular pipes is low after the butt joint connection is conducted and multiple times of correction need to be conducted generally, adverse effects on the production quality and the construction period are caused is solved. The tool comprises a working table, a first sleeve, a second sleeve and a duplex central frame, wherein the first sleeve and the second sleeve are installed on the two sides of the working table respectively, the duplex central frame is arranged in the middle of the working table, the first sleeve, the second sleeve and the duplex central frame share the same center line, bearings are arranged in the first sleeve and the duplex central frame respectively, a circular pipe fixing device is arranged in the second sleeve, a motor is linked with the circular pipe fixing device through a transmission device, and the duplex central frame is of a structure with an opening in the middle. By means of the tool beneficial for large circular pipe welding and welding deformation control, the welding efficiency and quality of the circular pipe butt joint connection can be improved, the control over the welding deformation is achieved after welding is conducted, and the straightness of the circular pipes which are connected in a butt joint mode is ensured.

The invention relates to a method for forming an ultra-thin stainless steel bend pipe. The method comprises the following steps: selecting hollow stainless seamless steel pipe as raw blank, regulating the clearance between a core head and the pipe to reduce the thickness reduction of the bend pipe and prevent corrugation; sleeving the seamless steel pipe in a forming mold core rod, regulating the technology parameters such as mandrel extension; mounting three mold core heads on a mandrel, wherein the distance between the mold core heads is in the range of 4-8 mm and thus the core heads can flexibly rotate; combining a clamping block and an insert block and fixing and clamping the pipe, guaranteeing the center of the pipe paralleled to the center of the mandrel by regulating the transverse pressure and increasing the friction force between the clamping block and the pipe; combining a push aid block and an anti-corrugation block, allowing a roller to rotate, forming a bend part, wherein the push aid speed of the push aid block is equal to the maximum linear velocity of the roller; bending the pipe to 90 degrees, lifting up the insert block and the push aid block, separating the insert block and the push aid block from the clamping block and the anti-corrugation block, and taking the formed bend pipe from the mandrel.

The invention belongs to the technical field of welding, and discloses a hollow tungsten electrode shunt based consumable electrode electric-arc welding device and method. The hollow tungsten electrode shunt based consumable electrode electric-arc welding device comprises a GMA welding power supply, a wire feeding mechanism, a shunt module, a controller, a current sensor, a workpiece, and a hollowtungsten electrode shunt consumable electrode welding gun, wherein the hollow tungsten electrode shunt consumable electrode welding gun comprises a welding wire, a conductive nozzle, a hollow tungsten electrode and a protective cover; one end of the welding wire is positioned in the wire feeding mechanism, and the other end of the welding wire is inserted into the conductive nozzle; the conductive nozzle is positioned in the hollow tungsten electrode; the upper half part of the conductive nozzle is a hollow cylinder; the lower half part of the conductive nozzle is a hollow cone; the hollow tungsten electrode is positioned in the protective cover; the upper half part of the hollow tungsten electrode is a hollow cylinder and the lower half part of the hollow tungsten electrode is a hollow cone; and the protective cover is in the shape of a cylindrical surface. The hollow tungsten electrode shunt based consumable electrode electric-arc welding device improves flexibility of the welding gun, guarantees consistency and reliability of welding quality, is convenient for all-position multi-direction welding, improves electric-arc stiffness and penetrability, and improves melting efficiency of filler wires.

The invention discloses a machining process of a large hydraulic plate shear rack, and belongs to the field of plate shear machining. The machining process of the large hydraulic plate shear rack comprises the machining steps that 1, wallboards and a front face plate are machined; 2, a bracket is welded, and a reference surface is machined; 3, the wallboards and the front face plate are welded; 4, a top supporting beam is welded between the two wallboards; 5, the bracket is intermittently welded and fixed; 6, cooling is carried out after fire spraying heating, and deformation is eliminated; 7, the bracket is welded again; 8, overall machining is carried out. By means of the machining process of welding method control, fire spraying deformation correction and overall machining, the deformation quantity of the rack during welding machining is reduced, size precision is improved, the product machining quality of a plate shear can be improved, and the service life of the plate shear can be prolonged.

The invention provides a suspension frame carrying arm structure of a middle-low-speed magnetic suspension vehicle, and relates to the technical field of magnetic suspension vehicle travelling mechanisms. The suspension frame carrying arm structure comprises an upper carrying arm portion, a lower carrying arm portion and a longitudinal beam connected with a carrying arm. The upper carrying arm portion and the lower carrying arm portion are in joggle joint through a tenon and a mortise, and are fastened through a bolt; the upper carrying arm portion and the longitudinal beam are in joggle joint through a tenon and a mortise, and are fastened through a bolt. Each tenon is of a hollow structure in the shape of double-hollow square blocks, and two rows of screw holes are distributed evenly in each of four surfaces. The lower carrying arm portion is an 'r-shaped' structure with a mounting base, the horizontal end of the 'r-shaped' structure is a mortise matched with a first boss structure, and two rows of screw holes are distributed evenly in each of four surfaces of the 'r-shaped' structure. A mounting base is arranged at the vertical end of the 'r-shaped' structure. A bevel with ridges is arranged at the right-angle position of the 'r-shaped' structure. Other two embodiments can be derived on the basis of the joggle-joint structures. The suspension frame carrying arm structure is mainly applied to suspension frame carrying arms of middle-low-speed magnetic suspension vehicles.

The invention provides processing method and clamp for a thin-wall double-channel structure, and belongs to the technical field of welding and processing. The method is that double-surface argon-arc welding is performed for welding the weld joint strength, the welding deformation is controlled by rigid limiting of the clamp, thus the processing quality of the welding assembly of the double-channel structure is improved, the technical bottleneck of cracking and chipping can be broken, and the stability of mass production and processing can be improved. The method comprises the steps of welding to form an inner channel welding assembly; welding to form an outer channel welding assembly; forming an inner channel hole and an outer channel hole; forming a groove; mounting the thin-wall double-running structure welding assembly on the clamp; performing double-surface argon-arc welding; non-destructively testing; thermally treating under vacuum. The clamp comprises a base, a rectifier blade locating block, a vertical column, a supporting rod, a pressing plate, an expansion block, a propping rod, an inner channel locating block, an outer channel locating block, a pressing cover, a first nut and a second nut.

The invention relates to the technical field of desulfurization and denitrification, particularly to an adsorption tower, a tower body module unit, and a manufacturing method of the adsorption tower. The adsorption tower sequentially comprises a feed part, a tower body and a discharge part from top to bottom, the tower body is formed by overlapping a plurality of same tower body module units, and a plurality of inner containing cavities which are parallel in the direction of the air flow and enable the material to descend are formed. The tower body is processed and formed and is manufactured on the modularized basis, all tower body module units are processed in a centralized manner in a factory, and are sequentially overlapped, assembled and fixed in the construction on site. Through the application of the adsorption tower, the construction capacity on site is greatly reduced, the difficulty in manufacturing the tower body is reduced, the production precision is improved, so that the safety and the reliably of the on-site operation are effectively improved; on the other side, the manufacturing of the adsorption tower accords with the standard of industrial standard production based on the arrangement possibility of pre-processing procedures and the convenience of on-site assembly operation, so that the processing and manufacturing costs and the overhaul and maintenance costs of the adsorption tower are greatly lowered.

The invention relates to an adjusting device for straight seam splicing welding of a pre-deformation thick plate and a welding method thereof and belongs to the technical field of welding and fixing devices. The adjusting device comprises a welding area, a left platform and a right platform. The welding area is in a linear long strip shape. The left platform is adjacently arranged on the left side of the welding area. The right platform is adjacently arranged on the right side of the welding area and symmetrical to the left platform. A left centering pushing plate and a left end pushing plate are arranged on the left platform. The left centering pushing plate is in a long strip shape and is parallel to the welding area. The left end pushing plate is arranged on one side of the left centering pushing plate and perpendicular to the welding area. The left end pushing plate is located between the left centering pushing plate and the welding area. An inner support is rotatably connected with the inner side of the bottom of the left platform, and an elevator is rotatably connected with the outer side of the bottom of the left platform. The adjusting device is used for straight seam slicing welding of the thick wall steel plate and has the functions of end aligning and automatic centering. Meanwhile, the pre-deformation angle is adjusted before welding, and after welding, the steel plate is changed gradually up to be in a horizontal state, so that welding deformation is eliminated.

The invention relates to a bolting and welding mixed connection structure for plate type steel plate walls and a construction method of the bolting and welding mixed connection structure.The bolting and welding mixed connection structure comprises the plate type steel plate walls, vertical bolting connectors and horizontal weld joints.The vertical bolting connectors are used for vertical connection of each same plate type steel plate wall, and the horizontal weld joints are used for horizontal connection of upper and lower plate type steel plate walls.In construction, after all plate type steel plate walls of a same wall section are fixed temporarily, vertical bolting connection of each plate type steel plate wall is completed sequentially, and then horizontal weld joint connection between upper and lower plate type steel plate walls is completed, so that mounting of plate type steel plate components is finished.By the bolting and welding mixed connection structure for the plate type steel plate walls and the construction method of the bolting and welding mixed connection structure, the problem of high welding deformation caused by welding connection for both vertical and horizontal connections of the plate type steel plate walls is solved, the problems of high positioning deviation, poor integrality and the like caused by bolting connection for both vertical and horizontal connections of the plate type steel plate walls are solved, and the problem of difficulty in high-precision, high-efficiency and high-integrality mounting of the plate type steel plate walls is solved.

The invention relates to a technological method for reducing deformation of sectioning thin-walled cylinder type workpieces. According to structural characteristics of the sectioning thin-walled cylinder type workpieces, by means of the combination of various methods of beforehand sizing, sizing and time keeping, auxiliary supporting, rough and fine machining, aging treatment and the like, the cylinder type workpieces are better in cylindricity after being sized, the requirement for working allowance is met after sizing, meanwhile, machining allowance is uniform, machining stress is uniform, and deformation is uniform; the thin-walled cylinder type workpieces are placed under application of a special sizing tool for a period of time before being roughly machined, welding deformation of the thin-walled cylinder type workpieces is better eliminated; the thin-walled cylinder type workpieces are placed again under application of the special sizing tool for a period of time before being finely machined, workpiece deformation caused after stress release in aging treatment is further reduced; meanwhile, the sizing tool is used as a machining auxiliary supporting tool, the workpiece strength is increased, and machining deformation is reduced.

The invention provides a high-speed brake pad provided with a connection board, wherein the connection board is added to a steel back, a dovetail board is installed on the connection board, and the connection board is connected with the steel back in a riveted mode. Welding deformation of the steel back and the dovetail board is eliminated, strength of the steel back is enhanced, the steel back cannot be deformed or shake under the action of pushing force of a brake, and a resilient pad is installed between the steel back and a skeleton of a brake block, so that the brake block can be effectively and tightly attached to a brake disc to achieve friction braking. By means of the structure, under the action of pushing of brake pressure, the brake block can be tightly attached to the brake disc in the same plane to conduct braking, and the problems of eccentric abrasion, falling of edges and corners of the brake block, low braking efficiency, long braking distance and the like are solved, wherein falling of the edges and the corners of the brake block, low braking efficiency, and long braking distance are caused by eccentric abrasion.

The invention discloses a reversible-deformation mechanism on an instrument panel beam welding fixture. The reversible-deformation mechanism comprises a support frame and a pressure mechanism, wherein the support frame is mounted on a bottom plate of the welding fixture. The support frame comprises a vertical plate, a front ribbed plate and a rear ribbed plate, wherein the vertical plate is vertically mounted in the middle of the upper end face of the bottom plate and forms an angle alpha with the upper end face of the bottom plate, the front ribbed plate is transversely mounted on the upper end face of the bottom plate and is perpendicularly connected in the middle of the front end face of the vertical plate, and the rear ribbed plate is transversely mounted on the upper end face of the bottom plate and is perpendicularly connected at one side edge of the rear end face of the vertical plate. The pressure mechanism comprises a pressure air cylinder, a connecting rod and a pressure head, wherein the pressure air cylinder is mounted in the middle of the rear end face of the vertical plate in a manner that a piston rod of the pressure air cylinder is upward, one end of the connecting rod is in hinge joint with the piston rod of the pressure air cylinder, the pressure head is mounted at the top of the vertical plate movably, and the rear end of the pressure head is in hinge joint with the other end of the connecting rod. The reversible-deformation mechanism is capable of applying rigid restraining force opposite to a welding direction additionally when an automobile instrument panel beam pipe is welded.

The invention discloses a technology device for thin-wall double-layer structure heat correction. A base and a round support are connected through hexagon bolts. A boss at the lower end of a disc is arranged in a groove in the upper end of the round support, and the end face of the round support is in face contact with the two ends of the disc boss. A guide groove is formed in the upper end of thedisc, and an expansion block is placed in the guide groove. One end of each small stand column is provided with a thread and penetrates through the expansion block to be fixed in a threaded hole in the disc. One end of a big stand column is provided with a thread and penetrates through an installing hole of the disc to be inserted and connected in an installing hole of the round support and is fixed to the round support through a cylinder pin. A cone penetrates through the big stand column and makes contact with the disc, and the conical face of the cone makes contact with the conical face ofthe expansion block. For a component, the cone is used for tensioning the expansion block through the disc guide groove, a large wedge block tightly presses the cone through a big stand column hole,and meanwhile a small wedge block locks the expansion block through a hole of each small stand column. A flying ring is fixed to the big stand column. According to the technical scheme, the structureis reasonable, the operation requirements for component assembling, heat correction, detachment and the like are met, and the design drawing and machining requirements are finally met.

The invention discloses a welding device and method for preventing welding angular distortion. The device mainly comprises a welding platform, a guide rail, a heating device, a control box, a feedback panel, a welding mask, a controller and soldering pliers. The control box is electrically connected with the heating device, the feedback panel, the controller and the soldering pliers. The heating device is installed on the guide rail. The guide rail is located below a welding post. The feedback panel is installed on the welding mask. The controller is arranged in a belt shape and installed on the soldering pliers. The method mainly includes the following steps that welding parts are fixed to the welding platform; the controller on the soldering pliers is adjusted, the heating device arrives at the position below a welding point, and the feedback panel displays positional information of the heating device in real time; a first microcontroller and a second microcontroller drive a first magnetic stripe and a second magnetic stripe to generate corresponding magnetic fields, and thus the end face of a heating tip can heat the back face of the welding point; and the welding point is welded. The welding device is simple in structure, convenient to use, high in working efficiency and low in production cost.

The invention discloses an automobile fuel filler cap assembly, which comprises a fuel filler cap main body and a reinforcing piece connected with the fuel filler cap main body, and is characterized in that a hinge assembly is connected with the reinforcing piece, and consists of a female hinge and a male hinge; and a latch is arranged on the reinforcing piece and is integrated with the reinforcing piece into a whole body, the root part of the latch is provided with a round rib, and a reinforcing rib and a sunk platform are additionally arranged on the reinforcing piece. The invention has the beneficial effects that: because adopting a weldment technology and accuracy guarantee measures, the automobile fuel filler cap assembly easily ensures the accuracy, has high strength, can realize high-precision rotating, and simultaneously has compact structure, light dead weight and low manufacturing cost.

The invention provides a high-speed high-strength brake pad. A connection plate is additionally arranged behind a steel back, a forked tail plate is arranged on the connection plate, and the connection plate is riveted with the steel back. Welding deformation of the steel back and the forked tail plate is eliminated, the strength of the steel back is reinforced, the steel back cannot deform or shade under effect of braking thrust, and an elastic gasket is installed between the steel back and a framework of the brake pad, so that the brake pad can be firmly adhered with a brake plate for friction braking. By means of the structure, under pushing of the brake pressure, the brake pad can be adhered onto the brake plate on the same plane for braking, and eccentric abrasion and various problems that edges and angles of the brake pad can fall easily, the brake efficiency is low, the brake distance is long and the like caused by the eccentric abrasion are avoided.

The invention relates to a heat treatment method for a large-size welding structure. The heat treatment method for the large-size welding structure comprises the following steps that a mold is installed, and the inner surface of the mold is coated with an insulating coating; an electrode is installed, and a to-be-treated part after welding is placed in the mold; a heat insulation insulating layer is laid, and a heat insulation insulating layer is laid on the surface of the part; a driving plate is installed, and the driving plate is bent and then attached to the heat insulation insulating layers; an induction coil is installed, the induction coil is fixed by adopting a supporting frame, and the induction coil is fixed to a welding seam area of the part through the supporting frame; local heat treatment is carried out, and the welding seam area of the part is subjected to local heat treatment through the joule heat effect generated by high-energy pulse current; shape correction is carried out, after the part reaches the preset temperature, the induction coil is connected with a magnetic pulse power supply, induction current is formed on the driving plate when the induction coil discharges, the electromagnetic force of the induction coil is transmitted to the part through the driving plate, and the shape of the part is corrected through the electromagnetic force; and the treatment is completed.

The invention relates to the field of clamps, and specifically relates to a following clamping device. The device comprises a device body, a driving mechanism which is mounted on the device body, anda clamping mechanism which is in driving connection with the driving mechanism, wherein the clamping mechanism comprises a bearing assembly, an elastic element and a clamping plate which are coaxiallyarranged; one end of the elastic element is fixed to the bearing assembly, and the other end of the elastic element is connected to the clamping plate; the driving mechanism drives the clamping mechanism to move, and the clamping plate clamps a workpiece; and the bearing assembly, the elastic element and the clamping plate are interlinked along with the workpiece. According to the following clamping device, the clamping mechanism is self-adapted to certain parallelism error and coaxility error of the clamping plate and the workpiece, so that the compressing force of the compressing plate is uniform, and the compressing plate follows smoothly, and as a result, the welding deformation of the workpiece in the later welding process can be removed.

The invention discloses an aluminum alloy semitrailer longitudinal beam assembly, and is applied to the technical field of semitrailers. The aluminum alloy semitrailer longitudinal beam comprises a longitudinal beam, wherein the longitudinal beam is made of aluminum alloy materials, and is divided into an ab segment, a bc segment and a cd segment in the length direction of the longitudinal beam; the ab segment, the bc segment and the cd segment adopt an integrated molding structure through a molding technology of an aluminum extrusion technology; the ab segment comprises an upper wing plate and a web, and the section of the ab segment is T-shaped; the bc segment comprises an upper wing plate, a web and a lower wing plate, and the section of the bc segment is H-shaped; the cd segment comprises an upper wing plate, a web and a lower wing plate, and the section of the cd segment is H-shaped; and gooseneck reinforcing plates are respectively arranged on one sides of the lower wing plates,and are connected with the web of the ab segment and the lower plate of the bc segment. Most current semitrailers are formed by the welding of steel structural components, and have the problems of being high in oil consumption, large in total semitrailer weight, poor in corrosion resistance, low in ratio of remaining value, and the like. Through the adoption of the aluminum alloy semitrailer longitudinal beam disclosed by the invention, the weight reducing effect can be improved under the condition of meeting the load required by laws, and the corrosion resistance, the recovery value, the ratio of remaining value and the economic benefit can be enhanced, so that the aluminum alloy semitrailer longitudinal beam has an extensive application prospect.

The invention discloses a process for forming an equal-wall-thickness reducing fuel spray rod through selective laser melting, and belongs to the technical field of additive manufacturing. The processfor forming the equal-wall-thickness reducing fuel spray rod through selective laser melting comprises the following steps of: S1, establishing a three-dimensional model of an equal-wall-thickness reducing fuel spray rod; S2, determining the forming direction of the equal-wall-thickness reducing fuel spray rod; S3, adding supports; S4, setting selective laser melting forming process parameters; S5, forming the equal-wall-thickness reducing fuel spray rod through selective laser melting; and S6, carrying out post-processing. According to the process for forming the equal-wall-thickness reducing fuel spray rod through selective laser melting, the number of processing procedures of the equal-wall-thickness reducing fuel spray rod is greatly reduced, the turnover time is greatly shortened, tools and clamps are not needed, the manufacturing period is shortened, the manufacturing cost is reduced, and the technical problems of large welding deformation of the fuel spray rod, a long repair period of a heat shield, large assembly residual stress, repeated correction and the like are solved.

The invention discloses a high speed train and a vehicle body and an end wall structure. The end wall structure comprises end door pillars (6) and an end wall body, and is characterized in that the end wall body comprises two end wall side panels (1) which are located on the left and on the right respectively and a top panel connected with the two end wall side panels (1), a door frame of the end wall structure is defined by the inner sides of the two side panels and the top panel, the inner sides of the end wall side panels are both provided with the end door pillars (6), and each end door pillar (6) and the corresponding end wall side panel (1) are of an integral structure; compared with the prior art, each end door pillar and the end wall side panel connected with the door pillar are integrally formed, welding connection is not needed for the end door pillars and the end wall side panels, the end wall side panels are not affected by the welding heat, so that welding deformation is eliminated and assembly precision of the vehicle body is improved, in addition the welding process is not needed so that the processing cost of the end wall structure can be reduced to some extent.

The invention discloses a method and a device for welding a drill pipe body for rotary drilling and outer keys. The method comprises the following steps of: a preheating step: preheating a welding area (13) between the drill pipe body (11) and each outer key (12); a welding step: welding the welding area (13) between the drill pipe body (11) and each outer key (12) to form a welding seam; and a post-heating step: heating the welding seam formed between the drill pipe body (11) and each outer key (12) after the welding step. The invention also discloses a device for welding the drill pipe body for the rotary drilling and the outer keys, which comprises a preheating unit (3), a welding unit (2) and a post-heating unit (4). By the technical scheme, the cold breaking phenomenon during the welding process of the drill pipe body and the outer keys can be effectively avoided. In addition, the welding stress and the welding deformation of the drill pipe body and the outer keys, caused after the preheating step and the post-heating step, can be effectively eliminated.