CH628832A5

CH628832A5 - Device for machining cutting tools hard metal or steel.

Info

Publication number: CH628832A5
Application number: CH633380A
Authority: CH
Inventors: Willy Voegtli
Original assignee: Willy Voegtli
Priority date: 1980-08-22
Filing date: 1980-08-22
Publication date: 1982-03-31
Also published as: EP0058177A1; WO1982000610A1; JPS57501228A

Abstract

The device comprises a first grinding member (1) for grinding in the mass the flutes (2) of a drill (3) and a second grinding member (4) for grinding in the mass the back of said flutes. The two grinding member (1, 4) operate simultaneously and are adjustable independently as to there angles, positions and centerings. Owing to this arrangement, the adjustment times are reduced by 80% and the production times by 2/3. The machining precision is increased in comparison to known devices.

Description

       

  
 

**ATTENTION** debut du champ DESC peut contenir fin de CLMS **.

 



   REVENDICATIONS
 1. Dispositif pour usiner des outils de coupe en métal dur ou en acier, comprenant une première meule pour rectifier dans le plein une goujure et une seconde meule pour rectifier dans le plein le dos de la goujure, caractérisé en ce que les deux meules (1, 4) sont entraînées séparément, mais agissent simultanément en une seule passe.



   2. Dispositif selon la revendication 1, caractérisé en ce que des moyens permettent de régler indépendamment les deux meules (1, 4) dans leurs angles, leurs positions et leurs centrages.



   3. Dispositif selon la revendication 2, caractérisé en ce que les positions des deux meules (1, 4) sont commandées par des dispositifs de copiage synchronisés avec l'avance de la pièce en travail (3).



   La présente invention a pour objet un dispositif pour usiner des outils de coupe en métal dur ou en acier, comprenant une première meule pour rectifier dans le plein une goujure et une seconde meule pour rectifier dans le plein le dos de la goujure.



   Dans les machines connues pour usiner des outils de coupe tels que mèches, mèches à centrer, alésoirs, fraises en bout, fraises circulaires, etc., on taille et rectifie d'abord la goujure avec une première meule, puis on utilise une seconde meule pour rectifier le dos de ladite goujure. Pour chaque goujure et son dos, il faut donc effectuer deux passages, ce qui provoque des temps morts pour régler les meules.



   La présente invention a pour but de remédier à ces inconvénients.



  Ce but est atteint par le dispositif selon l'invention qui est agencé tel que défini dans la revendication 1. Ce dispositif permet, par exemple, de réduire, d'une part, le temps de réglage d'environ 80% et, d'autre part, le temps d'usinage de 2/3
 Le dessin annexé représente, à titre d'exemple, une forme d'exécution du dispositif objet de l'invention:
 la fig.   I    est une vue schématique des meules dans l'axe de la pièce à usiner, en l'occurrence une mèche, et
 la fig. 2 est une vue en plan des meules et de la mèche,
 la meule de rectifiage du dos de la goujure étant représentée parallèle à la meule de rectifiage dans le plein de la goujure pour simplifier le dessin, les flèches indiquant les déplacements que les meules sont susceptibles d'effectuer.



   Le dispositif représenté montre l'usinage des rainures hélicoïdales et le détalonnage d'une mèche. Ce dispositif comprend une première meule 1 permettant de rectifier dans le plein les goujures 2 de la mèche 3. Cette meule 1 est montée sur un chariot (non représenté) susceptible d'être déplacé dans trois plans perpendiculaires les uns aux autres et fait un angle déterminé d'après le pas de la mèche 3 avec l'axe horizontal de ladite mèche qui se déplace selon son axe longitudinal (fig. 1 et 2).



   Pour effectuer le rectifiage du dos de la goujure, en l'occurrence le détalonnage, on a prévu une seconde meule 4. Dans la fig. 2, cette meule a été représentée parallèle à la meule 1 pour simplifier le dessin; mais, en réalité, son axe est incliné d'un angle   x    réglable par rapport au plan horizontal (fig. 1). La meule 4 est déplaçable en hauteur et dans deux plans qui se coupent à angle droit. Les meules 1 et 4 sont entraînées séparément, mais travaillent en même temps.



   Grâce à cet usinage simultané, le temps de production est réduit des deux tiers par rapport aux machines qui travaillent comme indiqué dans le préambule. Par ailleurs, la précision d'usinage est augmentée, vu que les réglages sont supprimés.



   L'entraînement et l'avance de la mèche 3, ainsi que les variations des positions des deux meules   1,4,    sont commandés par des dispositifs de copiage connus et synchronisés avec l'avance, de sorte que les meules sont amenées automatiquement dans la position adéquate sur la pièce en travail. 



  
 

** ATTENTION ** start of the DESC field may contain end of CLMS **.

 



   CLAIMS
 1. Device for machining cutting tools made of hard metal or steel, comprising a first grinding wheel to straighten a flute fully and a second grinding wheel to straighten the back of the flute, characterized in that the two grinding wheels ( 1, 4) are driven separately, but act simultaneously in a single pass.



   2. Device according to claim 1, characterized in that means allow the two grinding wheels (1, 4) to be adjusted independently in their angles, their positions and their centering.



   3. Device according to claim 2, characterized in that the positions of the two grinding wheels (1, 4) are controlled by copying devices synchronized with the advance of the workpiece (3).



   The subject of the present invention is a device for machining cutting tools made of hard metal or steel, comprising a first grinding wheel for straightening a flute in the solid and a second grinding wheel for straightening the back of the flute.



   In machines known to machine cutting tools such as bits, centering bits, reamers, end mills, circular milling cutters, etc., the flute is first cut and ground with a first wheel, then a second wheel is used to correct the back of said flute. For each flute and its back, it is therefore necessary to make two passes, which causes dead time to adjust the grinding wheels.



   The present invention aims to remedy these drawbacks.



  This object is achieved by the device according to the invention which is arranged as defined in claim 1. This device makes it possible, for example, to reduce, on the one hand, the setting time by approximately 80% and, on the other hand, the machining time of 2/3
 The appended drawing represents, by way of example, an embodiment of the device which is the subject of the invention:
 fig. I is a schematic view of the grinding wheels in the axis of the workpiece, in this case a drill bit, and
 fig. 2 is a plan view of the grinding wheels and the drill bit,
 the grinding wheel of the back of the flute being shown parallel to the grinding wheel in the full of the flute to simplify the drawing, the arrows indicating the movements that the wheels are likely to make.



   The device shown shows the machining of the helical grooves and the calibration of a drill bit. This device comprises a first grinding wheel 1 making it possible to straighten the flutes 2 of the drill bit in full. This grinding wheel 1 is mounted on a carriage (not shown) capable of being moved in three planes perpendicular to each other and makes an angle determined according to the pitch of wick 3 with the horizontal axis of said wick which moves along its longitudinal axis (fig. 1 and 2).



   To perform the rectification of the back of the flute, in this case the recalibration, a second grinding wheel 4 is provided. In FIG. 2, this grinding wheel has been shown parallel to the grinding wheel 1 to simplify the drawing; but, in reality, its axis is inclined by an angle x adjustable relative to the horizontal plane (fig. 1). The grinding wheel 4 is movable in height and in two planes which intersect at right angles. Grinding wheels 1 and 4 are driven separately, but work at the same time.



   Thanks to this simultaneous machining, the production time is reduced by two thirds compared to the machines which work as indicated in the preamble. In addition, the machining precision is increased, since the settings are deleted.



   The drive and the advance of the drill bit 3, as well as the variations in the positions of the two grinding wheels 1,4, are controlled by known copying devices and synchronized with the advance, so that the grinding wheels are brought automatically into the adequate position on the workpiece.

Claims

CLAIMS 1. Device for machining cutting tools made of hard metal or steel, comprising a first grinding wheel for straightening a flute in the full and a second grinding wheel for fully grinding the back of the flute, characterized in that the two grinding wheels ( 1, 4) are driven separately, but act simultaneously in a single pass.

2. Device according to claim 1, characterized in that means allow the two grinding wheels (1, 4) to be adjusted independently in their angles, their positions and their centering.

3. Device according to claim 2, characterized in that the positions of the two grinding wheels (1, 4) are controlled by copying devices synchronized with the advance of the workpiece (3).

The subject of the present invention is a device for machining cutting tools made of hard metal or steel, comprising a first grinding wheel for straightening a flute in the solid and a second grinding wheel for straightening the back of the flute.

In machines known to machine cutting tools such as bits, centering bits, reamers, end mills, circular milling cutters, etc., the flute is first cut and ground with a first wheel, then a second wheel is used to correct the back of said flute. For each flute and its back, it is therefore necessary to make two passes, which causes dead time to adjust the grinding wheels.

The present invention aims to remedy these drawbacks.

This object is achieved by the device according to the invention which is arranged as defined in claim 1. This device makes it possible, for example, to reduce, on the one hand, the setting time by approximately 80% and, on the other hand, the machining time of 2/3 The appended drawing represents, by way of example, an embodiment of the device which is the subject of the invention: fig. I is a schematic view of the grinding wheels in the axis of the workpiece, in this case a drill bit, and fig. 2 is a plan view of the grinding wheels and the drill bit, the grinding wheel of the back of the flute being shown parallel to the grinding wheel in the full of the flute to simplify the drawing, the arrows indicating the movements that the wheels are likely to make.

The device shown shows the machining of the helical grooves and the calibration of a drill bit. This device comprises a first grinding wheel 1 making it possible to straighten the flutes 2 of the drill bit in full. This grinding wheel 1 is mounted on a carriage (not shown) capable of being moved in three planes perpendicular to each other and makes an angle determined according to the pitch of wick 3 with the horizontal axis of said wick which moves along its longitudinal axis (fig. 1 and 2).

To perform the rectification of the flute back, in this case the calibration, a second grinding wheel has been provided

4. In fig. 2, this grinding wheel has been shown parallel to the grinding wheel 1 to simplify the drawing; but, in reality, its axis is inclined by an angle x adjustable relative to the horizontal plane (fig. 1). The grinding wheel 4 is movable in height and in two planes which intersect at right angles. Grinding wheels 1 and 4 are driven separately, but work at the same time.

Thanks to this simultaneous machining, the production time is reduced by two thirds compared to the machines which work as indicated in the preamble. In addition, the machining precision is increased, since the settings are deleted.

The drive and the advance of the drill bit 3, as well as the variations in the positions of the two grinding wheels 1,4, are controlled by known copying devices and synchronized with the advance, so that the grinding wheels are brought automatically into the adequate position on the workpiece. ** ATTENTION ** end of the CLMS field may contain start of DESC **.