6 results about "Corner radius" patented technology

The invention relates to a finite element judgment method for predicting hole flanging cracks, which comprises the following steps of: screening hole flanging meeting conditions according to a priority sequence of minimum hole flanging corner radius > minimum hole flanging diameter > maximum flanging height, and carrying out a hole flanging simulation test by utilizing finite element software. Comparing the stress value of the unit with the maximum stress of the neutral layer with the hole flanging crack in the simulation test with the maximum stress in the input stress-strain curve so as to correct the stress curve of the material until the stress value of the unit with the maximum stress in the simulation test result is equal to the maximum stress in the input original stress-strain curve; predicting hole flanging deformation characteristics and hole flanging cracks of the material; according to the method, the technical problem that only fixed-aperture hole flanging deformation characteristics can be predicted by adopting a traditional fixed-aperture method is solved, the hole flanging crack prediction precision of the part is greatly improved, the method is very suitable for occasions where parts with various different-aperture characteristics are predicted, and the application requirements of engineering practice and scientific research work are widely met.

Embodiments of the present application relate to a kind of elbow-shaped water inlet flow passage parameterization design method, device, equipment and storage medium.The method comprises: according to the preset three-dimensional structure of elbow-shaped water inlet flow passage, four-order Bezier curve is used to fit flow passage three-dimensional space guide line;Wherein, the three-dimensional space guide line is defined by five control points;Five control points are set in the symmetry plane of the elbow-shaped water inlet flow passage, and meet the preset constraint condition;Along the flow passage three-dimensional space guide line, feature cross section is placed at multiple preset positions;Wherein, the feature cross section is perpendicular to the flow passage three-dimensional space guide line, cross section area is continuously contracted along flow direction, and cross section shape gradually changes from the rectangle or rounded rectangle of the inlet of the elbow-shaped water inlet flow passage to the circularity of outlet, and the corner radius gradually increases along flow direction;Based on the feature cross section, continuous smooth flow passage side wall is generated, and three-dimensional flow passage model is obtained.The embodiment of the present application can control flow passage curvature variation, facilitate parameterization optimization.

The invention belongs to the field of metal manufacturing, and discloses a control method for over-bending deformation in the cold bending and rolling process of an aluminum alloy thin-wall corrugated groove profile, which comprises the following steps of: carrying out numerical simulation on the cold bending and rolling forming process of a multi-corrugated groove profile according to a constructed three-dimensional assembly model; and the bending plastic strain of the thin-wall profile under different cold-bending rolling forming process parameters is obtained through prediction. The influence degree of each process parameter on bending deformation is evaluated by researching the relationship between the roller diameter, the corner radius and the roller station spacing parameter and the bending plastic strain in the rolling forming process of the corrugated groove profile, so that the over-bending deformation control in the rolling process of the aluminum alloy thin-wall corrugated groove profile is achieved. According to the method, the plastic bending peak strain of the profile in the rolling process is reduced to the minimum in the mode of optimizing technological parameters, the method is also suitable for controlling over-bending deformation of multi-groove rolling forming pieces made of other alloy materials, the rolling forming quality of the profile plate is improved to a great extent, and the debugging cost of a rolling forming unit is greatly reduced.

The invention discloses a method for automatically generating a curled fillet curved surface based on virtual constraint and self-adaptive offset, and relates to the technical field of computer aided design, comprising the following steps: S1, constructing a virtual constraint wall: according to different constraint modes, along a parameter boundary of a basic curved surface, according to a certain height, direction and draft angle, constructing the virtual constraint wall; automatically generating an NURBS curved surface representing physical space limitation, namely a virtual wall; and S2, generating a self-adaptive offset curve: calculating a parallel space curve in a parameter domain according to the current offset near the target boundary of the basic curved surface. The system provided by the invention not only realizes automation of a whole process, but also introduces numerous key design parameters including a fillet radius, a flange height, a scanning angle, geometric attributes of a virtual wall and a constraint mode; in this way, the method can be easily integrated into a product life cycle management or computer-aided engineering optimization process to serve as a reliable link in design of an automation chain.

The application discloses a kind of ultrasonic auxiliary milling force modeling methods suitable for round corner cutter, three-dimensional cutting force measured by cutting force measuring system is converted to the normal force and friction force suffered by tool rake face, and break through the limitation of traditional right-angle cutter model, innovatively introduce the geometric correction to tool round corner radius, decompose cutting edge into linear segment and circular arc segment respectively for mechanical analysis and synthesis, so that the model can more truly reflect the complex stress state of round corner cutter, significantly improve the calculation precision of normal force and friction force, and has fundamental significance for in-depth study of tribological behavior, wear mechanism and chip formation process.

The invention provides a method for acquiring and analyzing surface topography data of a copper foil for nickel sheet convex hull stamping, which comprises the following steps: acquiring initial geometric parameters and material flow characteristic data of a nickel sheet, and analyzing the bidirectional tensile stress concentration degree of a bottom fillet area through stress distribution when the height of a convex hull is increased to obtain a strain concentration index of the bottom fillet area; according to the strain concentration index of the bottom fillet area, determining fillet radius configuration corresponding to the deformation stage through a genetic algorithm; extracting the metal transfer rate of the flange area from the corrected fillet radius configuration, simulating material flow balance from the flange area to the convex hull area, and determining a predicted value of the thinning degree of the bottom of the convex hull; and according to the optimized punch stroke parameters, the risk that microscopic cracks are generated and expanded along the grain boundary is evaluated, and a dynamic punching control sequence is generated.