8 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.

The invention discloses a wood component free-form surface machining system and method supporting flexible and quick connection of a cutter, and the system comprises a multi-axis mechanical arm which is arranged on a mechanical arm displacement platform which is used for controlling the displacement of the multi-axis mechanical arm in the horizontal direction; the wood processing platform is close to the mechanical arm displacement platform and corresponds to the multi-axis mechanical arm, and the wood processing platform is used for fixing a wood component to be processed; the multi-shaft mechanical arm is provided with an electric spindle, and the quick-changing band saw module is detachably connected to the end of the electric spindle. The multi-shaft mechanical arm is used for controlling the electric main shaft to advance or retreat at multiple angles, and the electric main shaft is used for clamping or putting down the quick-changing band saw module; when the motorized spindle clamps the quick-change band saw module, the free-form surface machining action of the wood component to be machined is carried out under the control of the multi-axis mechanical arm; the band saw does not need an independent motor, shares a power driving system with the motorized spindle, supports rapid switching of cutting tools, is compatible with a rotary milling composite process, and improves the machining efficiency.

The invention discloses a spiral machining track efficient generation method combining isoparametric lines and equal residual heights, and belongs to the field of free-form surface machining path planning. Firstly, a machining curved surface is converted into a parametric curved surface, and the curvature radius of each cutter contact is calculated; then, a boundary point of the parametric curved surface serves as an initial cutter contact, a first annular cutter contact track is generated through an isoparametric line method, other annular cutter contact tracks are sequentially generated through an equal residual height method, and the annular cutter contact tracks are made to be laid on the whole machining curved surface; and finally, interpolation is performed on adjacent annular cutter contact tracks in the v direction in a parameter domain of the parameter curved surface, so that the value of the previous annular cutter contact track in the v direction is uniformly transited to the value of the next annular cutter contact track in the v direction, a section of spiral cutter contact track is generated, and all sections of spiral cutter contact tracks form a continuous spiral cutter contact track. And coordinate transformation is conducted on the continuous spiral cutter contact tracks, and a spiral machining track is obtained. The method solves the problem of frequent cutter lifting.

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.

The invention belongs to the technical field of precision machining, and discloses a cup-shaped arc grinding wheel free-form surface grinding and error compensation method which comprises the steps that a theoretical free-form surface equation needed by free-form surface grinding is obtained, and the motion trail of the cup-shaped arc grinding wheel free-form surface grinding is obtained; based on a five-axis machine tool, the cup-shaped arc grinding wheel moves along the surface of the free-form surface workpiece according to the movement track, and the surface is ground into a free-form surface; after machining is finished, the surface shape precision of the free-form surface workpiece is detected, and a surface shape error is obtained; and the surface shape error is reversely added into the theoretical free-form surface equation, the compensation motion trail of the cup-shaped arc grinding wheel for grinding the free-form surface is calculated, the free-form surface workpiece is machined again till the surface shape error of the free-form surface workpiece is within the allowable range, machining is completed, the machining efficiency and precision of the free-form surface are improved, and the machining precision of the free-form surface is improved. And the problem of limited wear control precision is solved.