Translation of "Vorschleifen" in English

Due to the composition a fast rough grinding and re-finish is made easily.

The use of CBN grinding wheels permits both pre-grinding and precise finish grinding.

Due to the composition a fast rough grinding and a re-finish is made easily.

This interchangeable grinding wheel has sections to break the edges of the cams during roughing.

This rough-grinding can also be advantageous, depending on which material is to be machined.

An almost purely fine-grinding operation remains as finish grinding operation, without pre-grinding having to be carried out.

They are suitable for the pregrinding, deburring, chamfering, fine grinding and polishing of duroplastics, thermoplastics or elastomers.

To grind grooves or to pre-grind threads, a galvanically bonded grinding wheel is usually used.

After this machining of the crankshaft, the pregrinding which is otherwise customary can be dispensed with, so that merely a finish grinding of the bearing diameter, and therefore the removal of a very small oversize, is still necessary.

With this turning-broaching machining, the bearing diameter of the crankshaft is completely machined to such an extent that pre-grinding can be dispensed with so that only finish-grinding is effected.

Polishing or grinding the soleplate prior to the fabrication of an aluminum oxide coating has the advantage that, after fabrication of the soleplate with aluminum oxide, the amount of stock to be removed from the surface in order to achieve the specified final surface roughness is less than would be the case in the absence of a prior polishing or grinding operation.

In this process it is important that the pre-grinding of the back face of all the cutting inserts from one production run is done to the same degree of removal.

The method as claimed in one of claims 1 to 3, wherein at least some of the rough-grinding and finish-grinding is effected with a single grinding wheel.

Norton ceramic belts provide the best results in the pre-grinding, shaping and finishing of instruments in the Medical industry.

In fact, it is suggested that concave contours should be pre-ground with a large wheel and finished with a small wheel (Fig. 5).

The grinding of the rod bearings in the pin-chasing grinding process can be carried out with a single grinding wheel which serves for the rough grinding right through to the finish grinding and is used successively at the various rod bearings.

In this known method, the grinding started with the rough grinding of the main bearings so that the crankshaft is clamped in a precisely defined rotation axis, namely its defining geometrical longitudinal axis, for the grinding of the rod bearings.

The advantage of such a production line is that the substantial wear on the grinding wheels which is otherwise present in the rough grinding or pre-grinding of the flat shoulders no longer occurs, because this part of the pre-machining is performed separately on the turning centre by the turning tools.

A grain of 24 is more likely coarse and is suited, for example, for the removal of layers of glue or paint, while a grain of 60 is a more medium grain and is used, for example, for coarse pre-sanding of raw wood surfaces.

After the flat shoulders 9 have been turned in the context of the first working step, the loading of the grinding wheel becomes significantly less during the rough grinding of the journals because the plane grinding of the high flat shoulders on the central journals is omitted completely, at least in the case of pre-grinding.

Therefore during finish grinding this can take place in a single operation, so that the previously conventional sub-division into pre-grinding with a pre-grinding wheel and finish grinding with a finish-grinding wheel is often no longer necessary.

For these pre-machined crankshafts a conventional finish machining is then carried out in such a way that first of all pre-grinding is carried out, followed by finish grinding or fine grinding.

On the flanks, for instance, a coarse grain can be chosen on the surface, which can be used for instance for pregrinding when profiling a worm.

Pre-grinding the blade tip can for example be performed in a state where the rotor blade is attached to a dummy rotor disk as described in the introduction, or using a single blade grinding device.

To improve the efficiency of the production especially of rotors of rotary screw compressors and ensure a high quality of the production the invention is characterized in that the pre-grinding and/or the finish-grinding is carried out with a grinding worm (3) by a continuous generative grinding process.

In the processing steps from pre-grinding to fine grinding, tactile contour metrology is particularly well suited for determining the deviation from the nominal shape.