CAD software specialized for manufacturing
Create, supplement and modify CAD surface models
Parts are described virtually in the form of CAD models in CAD/CAM processes. Based on their origin in the participating CAD systems and their special mathematics, a distinction is frequently drawn between
- Surface models consisting primarily of free-form geometry and
- Solid models that consist primarily of ruled geometries.
The CAD model is always the template for the real part that will be manufactured. Tebis CAD software components provide a wide range of function packages for manufacturing-specific design tasks in a variety of industries. These include the following:
- The original creation of CAD free-form surfaces, designing with points, curves and surfaces in 3D space combined with ruled geometry
- The reverse engineering method that is based on scanned real parts, enables generation of the virtual CAD twin and updates it in the event of manual changes
- Design preparation of existing CAD models for their NC manufacture on milling machines, lathes, laser cutting machines and additional methods
- Special derivation of sinker electrodes from the part geometry to be generated in mold manufacturing
- Special creation of active surface geometry in sheet-metal draw-die manufacturing
- Compensation of springback effects in sheet-metal parts in sheet-metal draw-die manufacturing
- Qualitative optimization of existing surface models for surface quality
The Tebis CAD software will be updated with robust new functions in early 2019. The Tebis design functions will also be modified for parametric capabilities, which will yield more potential applications and simplified handling for designers and NC programmers.
Free-form surfaces are created from points and curves in 3D space. They represent a topology that describes the surface of the part. Factors that determine the quality of the surface model are the mathematical polynomial degree, the degree of segmentation and surfaces and gaps between the individual surfaces.
Reverse engineering is used everywhere where work is done manually on real objects and a CAD model is required for the subsequent process. In model manufacturing, design objects and vehicles modeled in clay are scanned and converted to CAD surfaces. In die manufacturing, manual changes to sheet-metal dies in the tryout phase are scanned and the existing CAD model is updated based on the scanned data.
The better a CAD model is prepared for NC manufacturing, the less effort needs to be invested in NC programming; in many cases, NC programming can then proceed automatically in Tebis.
Electrodes are required in mold manufacturing when special areas of the mold need to be machined on sinker EDM machines: for example, for ribs, sharp-edged depressions and special surfaces. Electrode design accounts for the part geometry, electrode holder and commercially available blanks.
Active surface design
Active surfaces are the areas of the sheet-metal die that come in direct contact with the sheet metal. There are active surfaces in all die components, including the die, punch, blank holder and all small parts for trim and restriking operations.
When active surface designers account for sheet metal thickness, thinning effects and reliefs in the CAD data used for the dies, it results in tremendous time savings in NC programming, machining and tryout.
The elastic properties of the sheet metal cause unavoidable springback effects after the forming of sheet-metal parts. This is ordinarily compensated in the sheet-metal die so that the part is initially formed to an "incorrect" geometry and then springs back to yield the desired geometry. Mechanical compensation introduced by grinding the die is enormously time-consuming. The approved die geometry can be derived far more quickly by implementing deformation technology in the CAD surfaces.
In addition to curvature, the most important evaluation criteria for CAD free-form surfaces include gaps and overlaps between the individual surfaces, the polynomial degree, the number of surface segments and the layout of the surfaces in the overall assembly. To improve later processing of the CAD data in design and manufacturing and to pass them on in other CAD systems, both automatic and manual surface optimization can be performed in Tebis to yield surface quality up to Class-A level.
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