Machines and complete plants

for the round bars

cold finishing

CENTERLESS GRINDING MACHINES FOR BARS

Our grinding machines are able to achieve the highest standards on the dimensional tolerances of roundness and surface finish, thanks to the extraordinary rigidity of the entire machine can avoid copying of pre-existing defects.

The Landgraf grinding machines have two grinding spindles and differ mainly respect to the classical centerless grinding for the way in which the bars are moved within the machine. The normal centerless grinding uses a contrast roller specially inclined opposite to the grinding wheel for the feed of the workpiece, or in this case of the bar. Our solution is to split the material’s removal area from the material’s advance area, by two pairs of disks placed one input and one output which roto-translate the material through the machinery.

What is gained with this philosophy?

 

1. The obvious possibility for the same size to use two opposite grinding wheels in place of one only, doubles the abrasive material’s quantity but especially the installed power is converted into greater capacity for chip removal. We achieve removals unthinkable standards  compared to a conventional machine, while still providing the geometry on the finished product. We reduce the number of passes required for the finished product thereby saving downtime for the moving of the material, energy and on the handling for the recirculation of the bars.

2. The speed of the discs is controlled by four separate inverters which allow to vary the rotation’s speed of the discs, which determines the variation of the speed of the bar’s feed. But also may vary simultaneously the positioning of the height axis of the discs compared to the working axis bar. This allows the operator to change during the grinding of the material also the rolling speed of the material that is the number of revolutions that the bar accomplishes with the constant feedrate

This is our historic range still in production that guarantees the classical reliability and accuracy throughout the range up to ISO IT 6 tolerances and surface roughness Ra≤ 0,1µm:

This is the future of the production range of LANDGRAF grinding machines in production since 2014, that has all the quality and the features of the previous range, but introduces new solutions that ensure the absolute reliability with significantly reduction of operator intervention thanks to a new automation system and new controls included. Was also added a new handling carts system that brings that the grindstone and corrections of the measurement on the bar, that allow us to guarantee a continuous tolerance up to ISO IT 5.

Landgraf s.r.l.

Via Enzo Pagani, 116
20025 Legnano (MI)

Phone: + 39 0331 1528680

Telefax: + 39 0331 1528681

 info@landgraf.it

 

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