Machining apparatus and method to machine surfaces in recesses of workpieces

Abstract

In a machining apparatus to machine surfaces in recesses of workpieces, especially tools with flutes and cutting edges, such as twist drills, milling heads, reamers, and similar, the machining apparatus has a circular disk-shaped or frustum-shaped machining body with a symmetrical and rotational axis which is seated in a bearing in a rotatable manner and is connected with a machining drive to generate a rotational movement of the machining body about its rotational axis. The machining body has magnets acting outward in relation to the rotational axis to retain magnetic or magnetizable, abrasive machining powder on a circumferential surface of the machining body. A workpiece holder positionable relative to the machining body and moveably driven at least in an advancing or rotational direction or both is connected at least indirectly by means of a corresponding positioning medium and drives to the bearing of the machining body.

1 . A machining apparatus to machine a surface in at least one recess of a workpiece, comprising: 
 a circular disk-shaped or frustum-shaped machining body with a symmetrical and rotational axis which is rotatably seated in a bearing and is connected to a machining drive to generate a rotational motion of the machining body about said rotational axis;    the machining body having magnets acting outwardly in relation to the rotational axis to retain magnetic or magnetizable abrasive machining powder on a circumferential surface of the machining body; and    a workpiece holder for said workpiece positionable relative to the machining body and moveably driven in an advancing or rotational direction or both and which is at least indirectly connected to the bearing of the machining body by means of corresponding positioning media and drives.    
   
   
       2 . A machining apparatus according to  claim 1  wherein the machining body is constructed as a magnetic head in which the magnets are formed from a plurality of permanent magnets to retain the machining powder.  
   
   
       3 . A machining apparatus according to  claim 1  wherein the workpiece holder has a feed drive and a rotation drive with which a workpiece is to be simultaneously advanced and rotated, the feed drive and the rotation drive being connected to a control unit constructed such that advancing motion and rotational motion of the workpiece are coordinated according to a path of said recess of the workpiece to be machined.  
   
   
       4 . A machining apparatus according to  claim 3  wherein the workpiece recess comprises a flute.  
   
   
       5 . A machining apparatus according to  claim 1  wherein the recess of the workpiece comprises at least one of a flute or a cutting edge, and wherein the workpiece comprises a twist drill, a milling head, or a reamer.  
   
   
       6 . A machining apparatus to machine a surface in at least one recess of a workpiece, comprising: 
 a circular machining body with a symmetrical rotational axis which is mounted to a rotatable bearing connected to a machining drive to generate a rotational motion of the machining body about said rotational axis;    the machining body having a plurality of magnets at a peripheral region to retain abrasive machining powder at a circumferential surface of the machining body; and    a workpiece holder for said workpiece positionable relative to the machining body and moveably driven, and the moveable driving being at least indirectly linked to movement of the bearing of the machining body for synchronization thereof.    
   
   
       7 . A machining apparatus to machine a surface in at least one recess of a workpiece, comprising: 
 a circular machining body with a symmetrical rotational axis which is mounted to a rotatable bearing connected to a machining drive to generate a rotational motion of the machining body about said rotational axis;    the machining body having a magnet system acting outwardly in relation to the rotational axis to retain abrasive machining powder at a circumferential surface of the machining body; and    a workpiece holder for said workpiece positionable relative to the machining body and moveably driven, and the moveable driving being at least indirectly linked to movement of the bearing of the machining body.