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Sunday, February 26, 2017


Sheet CAD

The software SHEET CAD is able to process some 240 different types of unfolding processes. Three-dimensional structures such as containers, pipe bend elbows, pipe branchings, screw conveyors, silos and adapters can easily be created using this software. Just select the required design from the options available (Fig. 1). You are now able to enter the dimensions directly into the drawing, illustrated by Fig 2. The three-dimensional structure, drawn to scale, now rotates on the screen for initial inspection. Full-scale unfolding process can now be displayed by a simple mouse click.

Fig. 1: Available options
Available options
Fig. 2: Design drawing for input of measures
Design drawing for input of measures
Fig. 3: Tru-scale rotating 3D-representation
Tru-scale rotating 3D-representation

Products can be easily manufactured from two-dimensional sheet unfoldings using parameters such as fold lines, flame-cut additions, folded seams etc. The position of the welding seam can be modified interactively (Figs. 4 and 5).

Fig. 4: System proposal for welding seam position
System proposal for welding seam position
Fig. 5: Previous figure after moving the welding seam by 180°
Previous figure after moving the welding seam by 180°

Large sheet unfoldings can be assembled from several small sheets in the form of a puzzle. A net of sheet metal plates of a given size is displayed on top of the unfolding contour and can be shifted using the mouse in order to optimize material requirements. Coordinates are then given for each metal sheet separately.
Correspondingly, the unfoldings in full size (i.e. 1:1) can be plotted in a puzzle.
Technical calculation parameters such as unfolding length and width, sheet dimensions, sheet weights, length of cuts and welded seams etc. can be rinted in the form of a table for each individual design or assigned to EXCEL.

Fig. 6: Calculation results
Calculation results

The data output is preferably generated using arc-line interpolation if a NC machine is connected. The contour then comprises of basket-handle arches and straight lines. You have the choice between x-y coordinates and a compass construction for a manual drawing.  
The accuracy of the unfoldings is entered as a calculation tolerance in millimeters. A low given accuracy minimizes, especially, the number of the resulting snatching coordinates.
A large number of parameters, such as drawing parameters, can be modified, thus making SHEET CAD a flexible and powerful software program. Here are some points:

  • Attaching seam edges
  • Adding component edges with/without notches
  • Number of interpolation points
  • Puzzle
  • Regular divide
  • Arbitrary divide
  • Selection of welding seam
  • Optimisation of welding seam
  • Accuracy of line interpolation
  • Accuracy of arc interpolation
  • Stamp length
  • Number of fold lines
  • Drawing with truncated fold lines
  • Showing the bending angle
  • Definition of origin
  • Illustrating the coordinate system
  • Creating bridges
  • Creating notches
  • Making the coordinate points visible
  • Marking of the infolding rectangle
  • minimum distance between figures
  • contour removal

With the module dimension each length, angle and curve can be dimensioned. With the module nesting, the unfoldings can be displaced and revolved by using the mouse, for nesting in a given plate.
With the module labelling, the unfoldings as well as the contours and folding angles can be labelled and exported in DXF-format.
With the modul print, on any place of the unfoldings can be printed a text to be exported by DXF.
Regular and irregular folding seams can be created for each contour of a folding.
Alternatively, connecting pieces can be entered as “put on” or “put through”.
Bending angles of each folding line can be given in a table for the most common designs.

Fig. 7: Folding seams
Folding seams