Apparatus and method for cutting edge preparation

Abstract

The invention describes an apparatus (1) for a cutting edge preparation of cutting tools (5), in particular of drills or milling tools or similar tools (5), in particular of hard-metal cutting tools, wherein during a relative movement the cutting tool (5) interacts in a machining fashion with a flexibly-bonded grinding body (2) that is provided with abrasive particles, the particles of the grinding body (2) influencing the edge geometry of the cutting tool (5),wherein the grinding body (2) is adapted with its dimensions substantially to the dimensions of the respective cutting tool (5) that is to be prepared and is accommodated in an exchangeable holder (4) which is arranged in a region of a processing device, in particular of a tool grinding machine, and is held such that it is machinable by the cutting tool (5) for the cutting edge preparation. Furthermore, a corresponding method and a corresponding grinding body (2) are given.

1 . An apparatus ( 1 ) fora cutting edge preparation of cutting tools ( 5 ), wherein during a relative movement the cutting tool ( 5 ) interacts in a machining fashion with a flexibly-bonded grinding body ( 2 ) that is provided with abrasive particles, the particles of the grinding body ( 2 ) influencing the edge geometry of the cutting tool ( 5 ),
 wherein the grinding body ( 2 ) is adapted with its dimensions substantially to the dimensions of the respective cutting tool ( 5 ) that is to be prepared and is accommodated in an exchangeable holder ( 4 ) which is arranged in a region of a processing device and is held such that it is machinable by the cutting tool ( 5 ) for the cutting edge preparation.   
     
     
         2 . The apparatus ( 1 ) according to  claim 1 ,
 wherein the exchangeable holder ( 4 ) is held in the workroom of a tool grinding machine.   
     
     
         3 . The apparatus ( 1 ) according to  claim 1 ,
 wherein the grinding body ( 2 ) is implemented substantially in a cylindrical fashion.   
     
     
         4 . The apparatus ( 1 ) according to  claim 3 ,
 wherein the cylindrical circumferential measurements of the grinding body ( 2 ) are substantially adapted to the circumferential measurements of the cutting tool ( 5 ) that is to be prepared.   
     
     
         5 . The apparatus ( 1 ) according  claim 1 ,
 wherein after complete usage, the grinding body ( 2 ) can be simply replaced by a new grinding body ( 2 ).   
     
     
         6 . The apparatus ( 1 ) according to  claim 1 ,
 whrerein the rotationally symmetrical grinding body ( 2 ) can be manufactured and be pressed into the exchangeable holder ( 4 ) with a very slight allowance that is adapted to the diameter of the cutting tool ( 5 ) that is to be prepared.   
     
     
         7 . The apparatus ( 1 ) according to  claim 1 ,
 wherein the exchangeable holder ( 4 ) is insertable into a bore ( 11 ) in the grinding disk receptacle ( 3 ).   
     
     
         8 . The apparatus ( 1 ) according to  claim 7 ,
 wherein the exchangeable holder ( 4 ) comprises an outer thread ( 6 ), which can be screwed into the bore ( 11 ) in the grinding disk receptacle ( 3 ) that is provided with an inner thread, or of a different processing device.   
     
     
         9 . The apparatus ( 1 ) according to  claim 7 ,
 wherein that the exchangeable holder ( 4 ) can be pressed or inserted into the bore ( 11 ) in the grinding disk receptacle ( 3 ) and is held there in a rotationally fix fashion.   
     
     
         10 . The apparatus ( 1 ) according to  claim 1 ,
 wherein a guide bushing ( 12 ) is arranged in the region of the exchangeable holder ( 4 ) for the grinding body ( 2 ), via which long-projecting asymmetrical cutting tools ( 13 ), having a great length:diameter ratio, can be guided and prepared, wherein the guide bushing ( 12 ) is arranged relative to the exchangeable holder ( 4 ) in such a way that the guide bushing ( 12 ) guides and supports the long-projecting cutting tool ( 13 ) in front of the region of the machining of the grinding body ( 2 ).   
     
     
         11 . The apparatus ( 1 ) according to  claim 1 ,
 wherein sensor elements, which provide information on the progression of the cutting edge preparation, are introducible in the exchangeable holder ( 4 ), wherein the sensor elements are equipped with accumulators, which are integrated in the exchangeable holder ( 4 ) and can be charged in the grinding disk magazine or externally while not in use.   
     
     
         12 . The apparatus ( 1 ) according to  claim 1 ,
 wherein the grinding body ( 2 ) comprises abrasive particles and is successively completely machinable by the cutting tools ( 5 ) which are to be prepared.   
     
     
         13 . The apparatus ( 1 ) according to  claim 12 ,
 wherein the grinding body ( 2 ) comprises a mixture of fine and coarse abrasive particles, wherein a distribution of fine and coarse abrasive particles within the grinding body ( 2 ) is implemented inhomogeneously.   
     
     
         14 . The apparatus ( 1 ) according to  claim 1 ,
 wherein the grinding body ( 2 ) has an axially-extending perforation ( 15 ) which is adapted to the cutting tool diameter ( 5 ) and within which the cutting tool ( 5 ) is not affected by the particles of the grinding body ( 2 ).   
     
     
         15 . The apparatus ( 1 ) according to  claim 1 ,
 wherein the grinding body ( 2 ) comprises sections ( 21 ,  22 ) having differing degrees of hardness of the bonding.   
     
     
         16 . A method for a cutting edge preparation of cutting tools ( 5 ), wherein during a relative movement the cutting tool ( 5 ) interacts in a machining fashion with a flexibly-bonded grinding body ( 2 ) which is provided with abrasive particles, the particles of the grinding body ( 2 ) influencing the edge geometry of the cutting tool ( 5 ),
 wherein the grinding body ( 2 ) is adapted with its dimensions substantially to the dimensions of the respective cutting tool ( 5 ) that is to be prepared and is accommodated in an exchangeable holder ( 4 ) which is arranged in the region of a processing device and in which the grinding body ( 2 ) is successively completely machined by the cutting tools ( 5 ) which are to be prepared.   
     
     
         17 . The method according to  claim 16 ,
 wherein the cutting edge preparation is carried out in the same clamping arrangement, directly following a first-time manufacturing of the shape of the cutting tool ( 5 ) or following a regrinding of the cutting tool ( 5 ), on the same processing device.   
     
     
         18 . The method according to one of  claim 16 ,
 wherein in the machining of the grinding body a wide range of adaptation of the cutting speeds is obtainable by the relative movement of grinding body ( 2 ) and cutting tool ( 5 ).   
     
     
         19 . The method according to  claim 18 ,
 wherein the grinding body ( 2 ) and the cutting tool ( 5 ) execute rotary movements during the machining of the grinding body ( 2 ), wherein a superimposition of the rotary movements of the grinding body ( 2 ) and of the cutting tool ( 5 ) permits selective roundings of the cutting edge of the cutting tool ( 5 ).   
     
     
         20 . The method according to  claim 18 ,
 wherein during the cutting edge preparation the cutting tool ( 5 ) that is to be prepared executes the necessary translational and rotary movements.   
     
     
         21 . The method according to  claim 16 ,
 wherein the grinding body ( 2 ) creates variable roundings over the cutting region of the cutting tools ( 5 ) by means of sections having different degrees of hardness of the bonding.   
     
     
         22 . The method according to  claim 16 ,
 wherein due to an axially-extending perforation ( 15 ), which is adapted to the cutting tool diameter ( 5 ) and within which the cutting tool ( 5 ) is not affected by the particles of the grinding body ( 2 ), the grinding body ( 2 ) does not subject the axial regions of the cutting tool ( 5 ) to a cutting edge preparation.   
     
     
         23 . The method according to  claim 16 ,
 wherein the grinding body ( 2 ) has external measurements which are adapted to the cutting tool diameter ( 5 ), such that only selected regions of the cutters of the cutting tool ( 5 ) are subjected to a cutting edge preparation.   
     
     
         24 . The method according to  claim 16 ,
 wherein the cutting edge preparation is carried out on new tools ( 5 ) or on cutting tools ( 5 ) which were reground and are therefore already coated with a hard-metal layer on certain functional surfaces.   
     
     
         25 . The method according to  claim 16 ,
 wherein the cutting tool ( 5 ) having main cutters and secondary cutters successively machines—by means of its main cutters, respectively secondary cutters—respectively corresponding grinding bodies ( 2 ) which have different characteristics and are allocated one by one.   
     
     
         26 . A grinding body ( 2 ) for an execution of the method according to  claim 16 ,
 wherein the cylindrical circumferential measurements of the grinding body ( 2 ) are substantially adapted to the circumferential measurements of the cutting tool ( 5 ) that is to be prepared.