4results about How to "Guaranteed shape and position accuracy" patented technology

A precise forming and manufacturing method for a spatial arc-shaped thin-wall structure relates to the field of precise forming of high-precision arc-shaped thin-wall structures, and comprises an upper female die, a lower female die, a left male die, a right male die and a positioning pin, the upper female die and the lower female die are consistent in structure and are symmetrical about an XOY plane, and the left male die and the right male die are consistent in structure and are symmetrical about a YOZ plane. A locating pin special hole is formed in the symmetric line of the upper female die and the lower female die, a thin-wall forming structure blank is installed between the upper female die and the lower female die, a locating pin penetrates through the locating pin special hole and a locating pin hole, and the upper female die and the lower female die are fixed through a fixing assembly. The inner arc surfaces of the upper female die and the lower female die are respectively designed according to upper and lower theoretical curved surfaces of the arc-shaped thin-wall structure; the left male die and the right male die are connected to the two sides of the upper female die through fixing assemblies, the left male die and the right male die are connected with the lower female die through fixing assemblies, and the die inner cambered surfaces of the left male die and the right male die are designed according to the left theoretical curved surface and the right theoretical curved surface of the arc-shaped thin-wall structure respectively. And high-precision manufacturing of the unit arc-shaped thin-wall structure is achieved.

A rectifier blade welding repair method, comprising the following steps: step S1: based on the finite element method, a thermal coupling numerical model of the rectifier welding process is established, and a heat source model of argon arc welding and laser welding is established; step S2: setting the argon arc welding numerical simulation parameters and the laser welding numerical simulation parameters, respectively adopting the argon arc welding and the laser welding mode to carry out numerical simulation welding on the rectifier; step S3: comparing the temperature field at the moment of welding completion, the residual stress field after welding and the residual axial deformation after welding by using the two welding modes; step S4: according to the comparison result in step S3, the suitable welding mode is determined; step S5: through the actual welding test, the feasibility of the suitable welding mode determined in step S4 is verified; step S6: if the feasibility verification in step S5 is passed, the rectifier is clamped by using the welding tooling, and the blade to be welded is welded on the outer ring by using the welding mode determined in step S4.

The invention discloses a wave generator, a harmonic reducer and an industrial robot, and relates to the field of harmonic reducers. The wave generator comprises a cam, an outer ring, a retainer and a plurality of rolling bodies, the rolling bodies are arranged between a first roller path of an annular part and a second roller path of the outer ring, the positions of the rolling bodies are limited through the retainer, and friction force generated when the cam rotates can be reduced. The cam comprises the annular part fixedly connected to the base part, and the first raceway is machined after the annular part is fixed to the base part, so that the problem that the first raceway is distorted due to the fact that the base part and the annular part need to be in interference fit is solved, the geometric accuracy and the form and position accuracy of the first raceway are guaranteed, and the operation stability of the wave generator is improved. And meanwhile, the problem that the annular part is easy to break and lose efficacy under the repeated action of alternating bending stress can be solved, so that the strength of the annular part is improved, and the service life of the wave generator is prolonged.

A processing device and method for a double thrust sliding bearing in the finishing stage, the device comprises two sets of pressure plate assemblies, the bearing alloy end face F is placed on the positioning working surface of the base so that they are reliably fitted, after the bearing is aligned, the first set of pressure plate assemblies is used to press the bearing alloy end face E through the inner hole to perform finishing of the outer circle, the second set of pressure plate assemblies is used to press the side of the outer circle ring groove from the outside of the bearing to perform finishing of the inner hole and the alloy end face E, the bearing is turned over, and the positioning cylindrical pin and the second set of pressure plate assemblies are used to position and press, and the alloy end face F is finished; the clamping force layout of the invention is reasonable, and the bearing is automatically centered when it is turned over without alignment, which solves the problem that the shape and position tolerance caused by the clamping of the bearing outer circle by the previous processing equipment is difficult to meet the design requirements and the quality problem that the alloy end face that has been processed is easy to be scratched, thereby ensuring the shape and position accuracy and product quality of the double thrust sliding bearing.