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INNOVATIVE TECHNOLOGY INNOVATIVE TECHNOLOGY

processing time on the CNC machine.
Given the complex shape and
large dimensions of the workpieces, it
was decided to scan them directly at the
customer’s enterprise using a portable
coordinate measuring machine (CMM)
СimСore INFINITE 2.0, equipped with a Fig. 2. Point cloud of one of the scanned blanks
ScanWorks laser scanner. With its help, a (top) and its corresponding theoretical CAD model.
3D scan of three blanks was made. The
scanning process was carried out in several
KIM reinstallations necessary for access
to product elements from all sides. As a
result, up to six files were obtained for each
blank describing its shape using clouds
of scanned points in various coordinate
systems. Then, using the PowerINSPECT
CAI system (also developed by Delcam),

Fig. 3. Examples of a triangulated 3D model blanks.

Fig. 4. Solid CAD model of one from blanks.

Fig. 5. The process of
combining CAD model
theoretical details with a
real model blanks to achieve
uniform allocation allowance.

Fig. 1. Heat-resistant blank dies, The use of reverse engineering
machined on CNC machines. tools implemented in Delcam software
allowed us to solve quickly the
problem of constructing solid-state
CAD models of actual workpieces
in a short time. This, in turn, made
the files were combined into a single coordinate system. Figure 2 shows the result of scanning it possible for programmers and technicians
in the form of point clouds (above) and the theoretical CAD-model of the workpiece, constructed to distribute evenly the machining allowance
according to the design documentation. After processing the scanned data in PowerSHAPE Pro and precisely set the boundaries of the zones of
(removing unnecessary and obviously erroneous points, thinning and smoothing surfaces), guaranteed safe tool movements at accelerated
triangulated 3D models of actual workpieces were constructed (Fig. 3). feeds. Thanks to the work done, the efficiency of
In order for the obtained 3D models of actual workpieces to be used in the CAM system control programs has significantly increased and
used at the enterprise, PowerSHAPE Pro also needed to create traditional solid-state CAD models the likelihood of breakdown of tools and equipment
of workpieces with an exact mathematical description based on triangulated surfaces (Fig. 4). has decreased.
In addition, auxiliary planes were constructed, which serve to base the theoretical CAD model
of the part relative to the actual workpiece.
After constructing solid-state CAD models of real workpieces, each CAD model of the
theoretical part was combined with a real workpiece model based on the condition of ensuring
the most uniform machining allowance (Fig. 5). A.G. Bazhin, I.A. Pechenkin, V.A. Puzanov.
Izhevsk State Technical University.

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