5 results about "Freeform surface machining" patented technology

The present application relates to the technical field of machining, in particular to a free curved surface machining track generation method based on conformal mapping, which first selects an input three-dimensional triangular mesh curved surface; then uses a boundary-first unfolding algorithm to unfold it into a two-dimensional parameter domain triangular mesh plane, so that the obtained two-dimensional parameter domain triangular mesh plane is rectangular, and the deformation generated by the mapping is minimal; the next step is to deform the shape of the two-dimensional parameter domain triangular mesh plane to the size of the design area; after a designer plans a two-dimensional machining track on the design area, i.e. the deformed two-dimensional parameter domain triangular mesh plane, the machining track is discretized into a plurality of machining track points, and the barycentric coordinates of the machining track points in the corresponding triangular elements of the two-dimensional parameter domain triangular mesh plane are calculated, and finally the machining track points are inversely mapped onto the input triangular mesh curved surface, so that the input three-dimensional machining track is obtained. The present application solves the shortcomings of the prior art and can adaptively generate a corresponding spatial machining track on a three-dimensional curved surface.

The invention relates to the technical field of optical element machining, and particularly discloses an x offset value adjusting method and device for aspheric surface, spherical surface and free-form surface machining and a storage medium. A corresponding aspheric coefficient is input for programming, and the aspheric arc height is determined to be correct; acquiring aspheric surface shape errors, and when the surface shape errors are in an M shape, a V shape, a W shape and an inverted V shape, changing the curvature radius R to convert the aspheric surface shape errors into the V shape or the inverted V shape; obtaining a PV value of a V-shaped or inverted V-shaped surface error and a corresponding x coordinate; in the aspheric software, a z value is input, a deviation value of an aspheric surface is calculated, for the aspheric software which completes parameter programming, an x coordinate is input, a corresponding vector height value z value is obtained, an x + x coordinate is input, a corresponding vector height value z + z is obtained, and x is a cutter deviation value generated by a machine tool during machining; inputting a cutter deviation value in the corresponding cutter number parameters of the single-point machine tool; and after aspheric surface measurement analysis, cutter radius or program radius adjustment is carried out according to the R.

The application relates to the technical field of free surface machining, and particularly discloses a laser additive manufacturing method for a free surface circuit, which specifically comprises the following steps: extracting a curved surface metal conductor model; dividing the curved surface metal conductor model into a plurality of quadrilateral grids, calculating the curvatures of each vertex in each quadrilateral grid, obtaining the average value of the curvatures of the positions of the vertices, and dividing a galvanometer processing area; according to the minimum normal angle principle, solving the optimal processing posture of each galvanometer processing area, and calculating the parameters of five mechanical movement axes; in each galvanometer processing area, the laser incidence angle under the optimal processing posture is determined; and the laser parameters are matched according to the laser incidence angle. By controlling the position between the laser and the free surface circuit, the laser can be incident on each processing area with the smallest incidence angle, and meanwhile, the laser micro additive manufacturing processing of the free surface surface circuit can be realized in a high-efficiency, high-precision and high-reliability mode by dynamically associating and controlling the laser parameters and the incidence angle.

The application relates to a large-curvature optical surface superfinishing tool path auxiliary curved surface construction method, which comprises the following steps: step S1, preliminary expansion: using the "expansion" instruction of UG software, uniformly expanding an original optical surface along the periphery to form an auxiliary surface consistent with the curvature of the original optical surface; step S2, lateral stretching: using the "stretching" instruction of UG software, stretching the expanded auxiliary surface on both sides; and step S3, surface rounding: using the "surface rounding" instruction of UG software, rounding all the connecting parts of the expanded surface and the lateral stretching surface of the auxiliary surface to form an integrated and curvature-continuous auxiliary curved surface. The application can realize "interference active avoidance", and completely solves the tool path disorder and collision problem in the machining of a large-curvature z free curved surface.

A method for turning free-form surfaces based on B-axis control of uniform tool wear includes: (1) preparation stage: setting tool parameters, surface quality requirements and effective cutting edge discretization model; (2) offline path planning stage: generating tool contact points based on Archimedes spiral, combining surface normal angle and virtual wear accumulation array, dynamically selecting the cutting edge with the least wear, calculating the corresponding B-axis rotation angle and updating the wear state; (3) online machining stage: performing tool center coordinate compensation, generating X, Z, C, B four-axis linkage NC code, driving the machine tool to complete the machining; This invention actively controls the B-axis posture, transforming tool wear from local concentration to uniform distribution across the entire cutting edge, significantly extending tool life, improving the machining accuracy and consistency of free-form surfaces, and is particularly suitable for single-point diamond turning of optical components such as off-axis parabolic surfaces.