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Shoe uppers and soles design

CAD in 2D is realized by digitization of the model basic lines with the help of digitizer tablet cursor or mouse. The designer creates then individual upper patterns interactively on screen using a number of special functions for effective work at all stages. Patterns can be also edited and combined with already designed parts.

Measurement of distances, lengths and areas etc. can be done very accurate and easily. To design in 3D, the shoe last geometry data has to be input first by a special scanning device. The upper pattern can then be sketched on the image of the last on monitor. The software module flattens the 3D parts in 2D for further use. The patterns, a complete documentation for shoe design and models for cutting die production, can be cut on cardboard directly with a table cutter connected to the CAD workstation.

Shoe upper patterns need to be graded for the whole scale of the assortment of the required shoe sizes, which can be French, English or American sizing. Individual parts are graded instantaneously, which enables the designer to check the graded parts on the monitor. If any discrepancies are found, the designer can change the grading specifications immediately and re-grade the parts in no time.

Cutting dies made of steel are used in the shoe production to cut uppers from leather, textile or synthetics. Some CAD systems offer modules, which enable long-distance transfer of data for shoe production preparation via modem or the Internet. The graphics data of patterns designed can then be transmitted easily to the die producer. The system calculates also the circumference of the die, which is the key factor of the die cost.

Automated cutting machines are widely used today in the footwear industry to cut uppers from leather, when die costs are relatively high for samples or low quantity styles. Computerized cutting systems use graphics data output of CAD systems as input.

CAD/CAM software can be used to generate machining data for shoe sole models and moulds. Shoe sole mould makers are able to strengthen their capabilities of mould design and production techniques to meet the market demands for shorter product life cycle, quality improvement and handling versatile pattern design. This helps especially sports shoe producers to manufacture products rapidly and to introduce them earlier than their competitors.

3D CAD/CAM is the core technology for shoe sole mould in the footwear industry and develops towards specialization.

Benefits of CAD/CAM in the mould manufacturing are total modeling for rapid generation of design concepts and variations, reverse engineering from existing models or parts, easy design modification and morphing capability, completely accurate designs regardless of complexity, group grading of soles and uppers, advanced decorating techniques, realistic onscreen visualization, rapid generation of molds from product designs.

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