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 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 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 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 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 discloses an aluminum alloy semi-trailer longitudinal beam assembly, which is applied in the technical field of semi-trailers, and comprises a longitudinal beam, which is made of an aluminum alloy material and is divided into an ab section, a bc section and a bc section along the length direction of the longitudinal beam. cd section, the ab section, bc section and cd section are integrally formed, and the molding process is an aluminum extrusion process. Among them, the ab section includes the upper wing plate and the web, and its cross section is T-shaped; the bc section and the cd section include the upper wing plate, the web plate and the lower wing plate, and its cross section is I-shaped, and one side of the lower wing plate is provided with The gooseneck reinforcement plate is connected with the web plate of section ab and the lower wing plate of section bc. At present, semi-trailers are mostly welded by steel structural parts, which have problems such as high fuel consumption, heavy vehicle weight, poor corrosion resistance, and low residual value rate. The present invention can lift and reduce weight while meeting the requirements of regulations Effect, and improve corrosion resistance, recovery value, residual value rate, economic benefits, has broad application prospects.

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.