Metal tools and implements – making – Saw-making or furbishing device or machine – Sharpening and gumming
Patent
1998-11-05
2000-08-29
Watts, Douglas D.
Metal tools and implements, making
Saw-making or furbishing device or machine
Sharpening and gumming
76 41, 76 43, 76 48, 76 77, 451 9, 451 65, B23D 6314
Patent
active
061091375
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a machine for machining workpieces which have cutting teeth, especially saw blades as defined in the precharacterizing clause of claim 1.
Such a machine is known from the brochure "VOLLMER CHD--Die Automaten zum Schleifen der kompletten Zahngeometrie hartmetallbestuckter Kreissageblatter in einer Einstellung", published by the applicant in October 1995. Although that machine is intended specifically for grinding the teeth of circular saw blades, machines characterized by the features recited in the preamble of claim 1 in principle are suited also for machining saw blades of band saws and gang saws as well as milling cutters and the like. Moreover, the work also may be carried out by way of electric discharge machining, using one or more rotating spark erosion discs. Accordingly, the instant invention is not limited to the grinding of teeth of circular saw blades.
Regardless of the general configuration and purpose of the workpieces to be machined, their cutting teeth normally are so hard that the rotationally symmetric tool used which is adapted to be driven in rotation, whether it be one or more grinding or erosion discs, may suffer so much wear, possibly by machining no more than one workpiece or but a single tooth, that dimensional variations of the tool must be taken into account in the further processing of the workpiece. To accomplish that, the tool so far must be subjected to time-consuming measurements. Usually a certain starting dimension of the workpiece also must be determined to allow for the proper positioning of the workpiece to be machined. With circular saws, for example, their diameter must be measured prior to machining. Finally, it must be kept in mind with machines of the kind in question that the advance finger belonging to the advance means gradually becomes flattened by its intermittent action on one each of the cutting teeth so that corrective measures are required to make sure that all the cutting teeth at least of one and the same workpiece are pushed by the advance finger precisely into the desired position for machining. The desired machining position of a machine of the kind in question normally is the position at which the tip of the cutting tooth to be machined lies on the axis defined as pivot axis. In general, and in the present case, too, the tip of the tooth is understood to be a sharp edge formed by a tooth face and the back of the tooth, also called tooth flank.
It is the object of the invention to make it possible for the measuring and correcting procedures described to be carried out automatically.
The object is met, in accordance with the invention, by the features defined in claim 1. Advantageous further developments may be gathered from the dependent claims.
An embodiment of the invention will be described in greater detail below with reference to diagrammatic drawings, in which:
FIG. 1 shows the machine according to the invention, as seen from the front,
FIG. 2 is an enlarged part sectional elevation in the direction of arrow II in FIG. 1,
FIG. 3 is the corresponding top plan view according to arrow III in FIG. 2,
FIG. 4 shows an enlarged cutout of FIG. 1 at a first phase of an operating cycle of the machine,
FIGS. 5 to 10 show corresponding cutouts at further phases of an operating cycle,
FIG. 11 shows an enlarged cutout of FIG. 3, but with modified tool equipment of the machine, and
FIG. 12 is a cutout similar to FIG. 7, but with further modified tool equipment of the machine.
The example shown of a workpiece 10 to be machined on the machine illustrated is a circular saw comprising hard metal trimmed cutting teeth 12, each of which is to be machined at its tooth face 14 and tooth flank 16 while its tooth tip 18 remains precisely in a predetermined position.
The machine shown comprises a machine bed 20 on which an elongate pivot body 22 is supported for swinging adjustment about a pivot axis A which is horizontal in the embodiment illustrated. The pivot axis A is defined as the line of intersection of a vertical first reference plane B an
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VOLLMER CHD, Die Automaten zum Schleifen der Kompletten Zahngeometrie, Oct. 1995, Germany.
Bailer Norbert
Lenard Peter
Schmucker Rudi
Browning Clifford W.
Vollmer Werke Maschinenfabrik GmbH
Watts Douglas D.
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