17 results about "Structural transition" patented technology

The utility model provides a fragmented steel-concrete composite structure transition section for a lattice type tower, which comprises two groups of fragmented structures which are oppositely arranged, two ends of the two groups of fragmented structures are connected through connecting components, each fragmented structure comprises a combined cavity, an outer steel shell, an inner steel shell cylinder, a top steel plate and a bottom steel plate, the inner steel shell barrel is arranged on the inner side of the outer steel shell, the top steel plate and the bottom steel plate are arranged on the tops and the bottoms of the inner steel shell barrel and the outer steel shell respectively and welded to the tops and the bottoms of the inner steel shell barrel and the outer steel shell to form a cavity, lattice type tower frame corner columns communicated with the combined cavity are arranged at the bottom of the combined cavity, and a concrete pouring body is arranged in the combined cavity. And the concrete pouring body is filled in an inner cavity of the lattice type tower corner post. The structure is simple in transmission and clear in stress, the compression resistance of the transition section can be remarkably improved, meanwhile, the risk of buckling of the combined cavity can be avoided, and the phenomenon that stress is concentrated when the stress of the upper steel tower is transmitted to the lower lattice section to be transmitted can be effectively avoided.

The invention discloses a corrosion-resistant and wear-resistant composite metal plate, which relates to the technical field of composite metal materials, and is technically characterized by comprising the following steps: firstly, preparing a flux-cored wire, and preparing deposited metal components according to mass percent by using a specific low-carbon steel strip; then, a thick low-carbon steel plate or a low-alloy steel plate serves as a base plate, a double-layer structure is formed through a gradient surfacing technology, a transition layer is prepared according to the proportion, a main wear-resisting layer is formed by fusing and diffusing flux-cored wires and contains various high-hardness wear-resisting phases, the lap joint width is controlled, cooling is conducted, and a surfacing composite layer is formed; the surfacing composite layer is integrally leveled through a press machine, and a semi-finished product is obtained; and finally, mixing organic silicon modified polyester resin and the like to prepare a joint sealing agent, coating the semi-finished product for 3-4 layers, and curing to obtain a finished product. The wear-resistant layer is free of cracks, and the corrosion resistance of the base body is improved.

The invention relates to the technical field of structural design optimization, in particular to a structural parameter optimization design method and system based on sheet metal parts. The method comprises the following steps of calculating a normal included angle field by extracting a surface patch normal and a surface center coordinate of a CAD model, identifying a rib position transition area, and performing arc length calculation, curvature point analysis, step jump judgment and transition curve fitting based on a rib rotation angle coefficient. And the fatigue performance and the structural design optimization effect of the fitted curve are verified through a load cycle test. According to the method, the transition rib position area of the sheet metal part is accurately recognized through the normal included angle field, fine parameterization of the curve form is achieved in combination with the rib rotation angle coefficient, then step jump analysis and fitting are carried out, the stress streamline and structure transition design is optimized, the improvement effect of the method on the fatigue performance is verified through a load cycle test, and therefore the damage risk is effectively reduced, and the fatigue performance of the sheet metal part is improved. And the service life and reliability of the sheet metal part under the repeated load are improved.

The invention discloses an electric arc additive remanufacturing method for a gradient material structure of a steel roller, aiming at the repair requirement of a 50Cr5MoV steel support roller, an electric arc additive technology is adopted, and a transition layer and a working layer are deposited in sequence to form a tough-hard gradient structure. A 410 martensitic stainless steel gas shielded welding wire is selected as a transition layer, a wear-resistant flux-cored wire containing 13% of chromium is adopted as a working layer, and good metallurgical bonding of a cladding layer and a matrix is achieved by optimizing the preheating temperature of 220 DEG C, the interpass temperature (250-600 DEG C, preferably 600 DEG C) and welding parameters. The method solves the problems of low bonding strength, easy cracking and single performance in traditional repair, remarkably improves the shock resistance and high-temperature wear resistance of the repair layer, is low in cost and high in efficiency, and is suitable for remanufacturing of high-temperature wear components such as rollers.

This invention relates to the field of integrated molding in the low-to-intermediate temperature range of aero-engines, specifically to a method for constructing a "sandwich structure" to prevent cracking. This invention combines laser-directed energy deposition technology with gradient structure transition design. Through precise control of process parameters and synchronous powder feeding from multiple powder bins, a dual-interface "sandwich structure" of "TC4 matrix - gradient transition structure - Inconel 718 material" can be successfully constructed, achieving integrated molding of heterogeneous materials. The "sandwich structure" designed in this invention can alleviate stress concentration caused by drastic compositional changes, reduce cracking tendency, achieve good metallurgical bonding between TC4 and Inconel 718, and solve problems such as easy cracking failure and poor load-bearing capacity in heterogeneous material connections. This invention features a reasonable structural design, a simple and controllable manufacturing process, and produces a product with excellent performance, facilitating industrial application.

This invention relates to the field of intelligent manufacturing technology, specifically to an intelligent method and system for evaluating the solidification effect of ductile iron using multi-parameter fusion. The method includes the following steps: acquiring the crystallization interface and cooling path, identifying grain offset trends, tracking impurity offset trajectories, determining grain misalignment boundaries, analyzing pore extension directions, identifying structural path intersection relationships, and obtaining the structural interference trend manifestation during the solidification process. In this invention, the spatial offset between the grain propagation direction and the cooling path is used to identify local structural transition regions; the migration trajectory of impurities in grain abrupt change regions is correlated with boundary changes for identification; grain connection angle jumps are used to determine misalignment paths; the pore extension direction and grain arrangement relationship are used to calibrate the penetration trend; the intersection behavior between paths forms the basis for fusion judgment through spatial distribution; interference regions are extracted; and the linkage between path behaviors transforms the local structural state into a difference in the solidification process, improving the coverage accuracy of multi-parameter fusion evaluation at the structural level.

A method for transition from a bent arc to straight corner welding adopts a transition plate to transition an arc-shaped bent plate to straight corner welding, so that longitudinal continuity of an inner bottom plate, an inner shell and a stringer structure is realized, a large toggle plate, the transition plate and the inner bottom plate are sequentially butted and welded, and fillet welds of the stringer, the large toggle plate, a connecting plate and the inner bottom plate are continuous. The transition arc plate gradually transits the arc of the large toggle plate to the straight corner welding seam, and no structural hard point and no non-alignment structure exist in the whole structure transition process. The transition of the continuous bulkhead structure from the arc bending form to the fillet welding form is effectively realized through the transition form of variable arc radius, and the tightness and continuity of the key node position of the continuous bulkhead structure are ensured. According to the design scheme that the arc is transited to the straight edge, narrow space which cannot be aligned is avoided, the structure has the advantages of being convenient to construct, continuous in structure, high in reliability and reasonable in structural design, materials are saved, and the number of structural components and the structural weight can be effectively reduced.

The invention provides an aluminum steel structure transition joint, a butt joint and a welding method of the aluminum steel structure transition joint. The welding method of the aluminum steel structure transition joint comprises the following steps that to-be-welded faces of a to-be-welded composite layer, a to-be-welded middle layer and a to-be-welded base layer are ground and polished; the composite layer is an aluminum alloy plate, the middle layer is an aluminum-manganese series aluminum alloy plate, and the base layer is a steel plate; the treated base layer and the treated middle layer are subjected to first-time explosive welding, and the aluminum alloy-steel composite plate is obtained; the aluminum alloy-steel composite plate is subjected to leveling and surface polishing treatment; and the aluminum alloy surface and the composite layer in the obtained aluminum alloy-steel composite plate are subjected to secondary explosive welding, and the welded composite plate is machined into the transition joint. According to the method, an aluminum-manganese series aluminum alloy plate serves as a middle layer, a composite plate is obtained through layered two-time explosive welding, a transition joint is prepared through a cold machining method, joint butt joint is achieved in combination with electromagnetic pulse welding, and transition connection between dissimilar metal aluminum alloy and steel is achieved.

The utility model relates to a carbon fiber array frame for aircraft installation equipment. The carbon fiber array frame comprises a structure transition piece and an assembly transition plate. The structure transition piece is composed of a carbon fiber main body structure and a metal connecting piece; the carbon fiber main body structure and the assembly transition plate are made of carbon fiber composite materials, and the metal connecting piece and the standard piece are made of titanium alloy materials. The outer diameter of the carbon fiber main body structure is a semicircle which is the same as the outer diameter of an aircraft; the metal connecting piece is connected with the carbon fiber main body structure through a screw and an adhesive; the installed equipment, the vibration isolator and the assembly transition plate are connected to the structure transition piece through the bolts, the double-folded sawtooth locking gasket, and the structure transition piece is fixedly connected with the reserved interface of the platform through the bolts. The device has the advantages of being simple, easy to achieve, resistant to corrosion and pressure and capable of fixing the device on the horizontal plane of the aircraft, and the buoyancy of the aircraft in water is guaranteed.

This application provides a substrate conveying device, relating to the field of semiconductor manufacturing technology. By forming recessed clearance grooves on opposite sides of adjacent rotating shaft assemblies, and fitting a separating support member and at least partially embedding it within these grooves, an embedded fit is formed between the separating support member and the adjacent rotating shaft assemblies in the axial direction. This transforms the originally independently arranged separating and supporting structure in the axial direction into an embedded structure arrangement. While ensuring that each rotating shaft assembly can rotate independently and achieve reliable support, the recessed space between adjacent structures accommodates and embeds the separating support member, reducing the redundant stacking of structures in the axial direction. This compresses the structural transition area between adjacent rotating shaft assemblies, thereby reducing the overall stacking length of the multi-shaft integrated structure in the axial direction, improving structural compactness and space utilization, and enhancing its applicability in space-constrained robotic arms and conveying systems.

The invention discloses a high-activation-performance vanadium-based solid solution hydrogen storage alloy, and relates to the field of hydrogen storage alloys, the hydrogen storage alloy has a gradient nanostructure, and comprises a core area: an isometric crystal structure with a grain size of 50-200 nm; the transition area is of a nanocrystalline structure with the grain size of 20-50 nm; and the surface layer area is an amorphous / nanocrystalline composite layer with the thickness of 2-8nm, by designing a gradient nanostructure and through the synergistic effect of the core area, the transition area and the surface layer area, the mechanical strength of the alloy is guaranteed, the surface activation performance is improved, and by means of the novel preparation technology combining ball milling with gradient sintering and accurately controlling technological parameters of all stages, the mechanical strength of the alloy is improved. And the optimized distribution of the additive and the controllable formation of the nano structure are realized.

The application provides an aluminum-steel structure transition joint, a butt joint and a welding method thereof. The welding method of the aluminum-steel structure transition joint comprises the following steps: polishing and polishing the to-be-welded surfaces of a complex layer, an intermediate layer and a base layer to be welded respectively; the complex layer is an aluminum alloy plate, the intermediate layer is an aluminum-manganese aluminum alloy plate, and the base layer is a steel plate; the treated base layer and intermediate layer are subjected to first explosive welding to obtain an aluminum alloy-steel composite plate; the aluminum alloy-steel composite plate is subjected to leveling and surface polishing treatment; the aluminum alloy surface of the obtained aluminum alloy-steel composite plate and the complex layer are subjected to second explosive welding, and the welded composite plate is processed into a transition joint. The aluminum-manganese aluminum alloy plate is used as the intermediate layer, the composite plate is obtained through layered two-time explosive welding, the transition joint is prepared through cold working, the joint butt joint is realized through electromagnetic pulse welding, and the transition connection between the dissimilar metals of the aluminum alloy and the steel is realized.

The invention discloses a high-efficiency low-loss grinding method for laser lift-off of a 4H-SiC wafer, which comprises the following steps of: carrying out directional modification treatment on the inside of the 4H-SiC crystal by adopting laser to form a lift-off layer, and separating the wafer from the crystal; carrying out microscopic observation on the wafer after laser stripping, and identifying a laser modified layer, a structure transition layer and an intrinsic SiC layer of the wafer; and according to the structural characteristics of different areas, feeding parameters of segmented grinding are set, the feeding speed of the laser modified layer is made to be larger than that of the intrinsic SiC layer, and automatic thinning equipment and a diamond grinding wheel are used for precise grinding. According to the layered feeding strategy, matching of machining parameters and material structure characteristics is achieved, the stability of the grinding process is effectively improved, the surface quality is effectively improved, and the service life of a tool is effectively prolonged.

The application belongs to the technical field of aviation manufacturing, and discloses a replaceable head type end face groove turning tool and a machining method thereof. The turning tool adopts a sectional structure design and comprises a replaceable head, a transition section and a tool shank. The head is a replaceable structure, the transition section is welded with the tool shank to form a tool body, and the head and the tool body are both formed by wire cutting. During use, the head is inserted into an arc-shaped through slot, and the turning tool holder baffle is pressed to tightly install the turning tool. During the machining process, when the head is worn, the head is only needed to be replaced, and the above installation process is repeated to continue using the turning tool. The machining process property is fully considered in the structural design, the risk of head fracture in the manufacturing and using process is effectively reduced, and the turning tool has the advantages of reducing machining difficulty, improving production efficiency, prolonging tool life and the like.

The application discloses a composite material flat plate flow-induced testing device with a flow guide device and a method, and belongs to the technical field of ship and ocean engineering testing.The application solves the problem that when the existing flow-induced testing device adopts a composite material flat plate to perform flow-induced testing, water flow encounters structural transition and is easy to cause turbulence eddy such as flow separation and backflow, and is easy to affect the vibration noise testing result.The first flow guide structure is used to realize smooth transition between the front flow-encountering surface of the composite material flat plate and the top inner wall of the uniform speed working section, and the second flow guide structure is used to realize smooth transition between the rear flow-encountering surface of the composite material flat plate and the top inner wall of the uniform speed working section.Through the first flow guide structure, the water flow is guided to move along the flow-encountering surface of the composite material flat plate, and the water flow encountering structural transition is avoided to cause adverse effects on measurement.Through the second flow guide structure, the water flow is guided to leave the rear part of the composite material flat plate, and the turbulence eddy such as flow separation and backflow caused by structural transition is avoided to cause adverse effects on measurement.

The invention discloses a flexible gasket for shaft end compression connection and a connection system. The flexible gasket comprises a gasket body, the section of the gasket body is S-shaped, termination contact surfaces are formed on the outer sides of two corner sections of the S-shaped gasket body, the two ends of the S-shaped gasket body extend out relative to the termination contact surfaces, and initial contact surfaces are formed at the two ends of the S-shaped gasket body. The connecting system comprises the threaded shaft and further comprises the flexible gasket, and the gasket body is arranged on the threaded shaft and located between the pressed piece and the pressing nut. The flexible gasket has the beneficial effects that the flexibility of the gasket is high, the flexibility of a traditional connection system can be improved by dozens of times to dozens of times, meanwhile, the elastic compression length of the flexible gasket can reach 3-4 mm, and large uncoordinated deformation of the connection system can be contained; the gasket is uniform in overall thickness, smooth in structural transition, S-shaped and free of obvious stress concentration when pressed; the gasket is provided with a termination contact surface, can bear large extrusion force, and allows the compression nut connecting system to have high initial pretightening force.

This invention discloses a method for determining the lower edge curves of the mid-span and lower chord beams of a hollow continuous rigid frame bridge, including determining the total height H between the upper and lower chord beams in the hollow area and the height h of the lower chord beam in the hollow area. 1 The height h of the upper chord beam in the empty area 2 Beam height at the junction of the upper and lower chords, and the range L of the mid-span beam segment. m and the height h of the mid-span beam 3 The method calculates the lower edge curve F(x) of the mid-span beam segment and the lower edge curve G(x) of the hollow lower chord beam segment; calculates the continuity of the function and first derivative of curves F(x) and G(x) at the connection point of the upper and lower chords; in this method, the lower edge curve of the mid-span beam segment conforms to the stress characteristics of the mid-span beam segment in cantilever construction; the upward arch of the lower edge curve of the hollow lower chord beam segment balances the self-weight of the lower chord beam segment and the load transmitted by the upper chord; the structural transition and stress transmission between the mid-span beam segment and the hollow lower chord beam segment are smooth; the lower edge curves of the mid-span beam segment and the hollow lower chord beam segment are optimized, making the structure of the hollow continuous rigid frame bridge more reasonable.