This news article was originally written in Spanish. It has been automatically translated for your convenience. Reasonable efforts have been made to provide an accurate translation, however, no automated translation is perfect nor is it intended to replace a human translator. The original article in Spanish can be viewed at HVR ofrece nuevas posibilidades en el desbaste de piezas grandes

A new module of the WorkNC CAM allows huge savings in the grinding of large parts

HVR offers new possibilities in the grinding of large parts

15/10/2002

The German subsidiary of French firm Sescoi has developed a machining strategy, including the version 15 of WorkNC (CAM) software, which is a very attractive alternative to the grinding of large pieces.

Roughing of great volume (in English called HVR: High-Volume Roughing) is a cycle of machining to reduce very significantly the cost and time in the cutting of parts with an important volume of swarf by extract (Z depth of more than 150-200 mm and a minimum size in X and and).

As they have found numerous clients of WorkNC and Ingersoll in Germany, in many practical cases is may reduce time roughing up to more than 50% and the total cost of mechanization by 20%.

The HVR allows the use of cutting tools of Iscar (Plunger) and Ingersoll (Punch In) (see Figure 1)

Figure 1

These tools Nombre large amounts of chips advancing along its Z axis.

The deleted section of material is Crescent-shaped and, in the case of a 100 mm diameter tool, the cross section is 1395 mm2, compared to the 183 mm2 of a traditional tool. (see fig 2).

Figure 2

Therefore with the HVR-speed of removal of swarf from 3 to 6 times higher than traditional roughing in high or low speed can be achieved.

Sescoi WorkNC software is adapted to the characteristics of these tools, and is the only one able to intelligently manage the successive last, beginning to attack the piece in its deeper, looking for successive points of attack avoiding the tool enters into narrow channels or hit to retire in search of a new point of attack.

To the left of the figure 3

Figure 3

the final model of a piece can be seen to mechanise, the Centre contains the HVR routes calculated by WorkNC (red displacement and yellow the progress of work) and to the right a visualization that WorkNC shows will look the block after the end of the cycle of HVR.

With the HVR have eliminated the vast majority of the volume of swarf removal to extract, and as second operation is recommended to use a roughing tool by detour, of similar to the HVR tool diameter, eliminating in this way the small steps that they have still been on the block. Subsequently all the operations of semi-processed and finished will be identical to those used traditionally with CAM systems.

WorkNC also allows to use the HVR within cavities, whenever that is carried out an initial drill at the point that will begin to work the HVR tool. The software allows to configure several parameters that optimize the HVR depending on the preferences of the user.

The HVR brings large savings in applications that comply with:

Parts with more than 150-200 mm Z, and a minimum dimensions X and and, with a geometry that involves lots of chips by extract.
Pieces of steel, aluminium or alloys of nickel.
Machine (new or old interchangeably) with a robust head and sufficient power. Vertical machining centres, it is important to expel the shavings with air pressure, especially to artefact cavities, being less relevant here in the case of horizontal centers (see Figure 4).

Figure 4

With the HVR have eliminated the vast majority of the volume of swarf removal to extract,

and as second operation is recommended to use a roughing tool by detour, of similar to the HVR tool diameter, eliminating in this way the small steps have yet been on the block

In addition to the considerable saving of time and cost, and additional benefits of the HVR must be cited:

Better use of the free capacity of machines them: machines and old controls (2D continuous) can compete with the new generation.
Minimum radial effort during the mechanization: minimum bending of the tool and minor wear of the printhead
Symmetric and continuous effort on the cutting edge of the tool