Free curved surface precision machining tool

Abstract

A free curved surface precision machining tool for precision-machining a surface to be machined with the lower end in contact therewith by rotation around an axis x. It includes a drum-shaped tool having a rotation axis x orthogonal to the axis z and rotationally driven around the rotation axis x. This drum-shaped tool has a convex machining surface in the form of an arcuate rotary body obtained by rotating an arc of a radius r with the center at the intersection O between the axis z and the rotation axis x around the rotation axis x. The convex machining surface contacts the surface to be machined to precision-machine the latter, while the convex machining surface is rotated around the orthogonal axis x so as to disperse the machining position of the convex machining surface.

1 . A free curved surface precision machining tool for precision-machining a surface to be machined with the lower end in contact therewith by rotation around an axis z, comprising a drum-shaped tool having an orthogonal axis x orthogonal to the axis z and rotationally driven around the orthogonal axis x, 
 wherein the drum-shaped tool has a convex machining surface in the form of an arcuate rotary body obtained by rotating an arc of a radius r with the center at the intersection O between the axis z and the orthogonal axis x around the orthogonal axis x, whereby the convex machining surface contacts the surface to be machined to precision-machine the latter, while the convex machining surface is rotated around the orthogonal axis x so as to disperse the machining position of the convex machining surface.    
   
   
       2 . The free curved surface precision machining tool according to  claim 1 , wherein the radius r is set smaller than the maximum radius R of the convex machining surface from the orthogonal axis x, whereby the position control of a machining trajectory is performed at the center O of rotation of the arc.  
   
   
       3 . The free curved surface precision machining tool according to  claim 1 , wherein the radius r is set larger than the maximum radius R of the convex machining surface from the orthogonal axis x, whereby the position control of a machining trajectory is performed at the center A of the lowest arc.  
   
   
       4 . The free curved surface precision machining tool according to  claim 1 , wherein the convex machining surface of the drum-shaped tool is made of a grindstone or a cutter.  
   
   
       5 . The free curved surface precision machining tool according to  claim 4 , wherein the grindstone includes a metal in its bonding material.  
   
   
       6 . The free curved surface precision machining tool according to  claim 1 , further comprising a non-machining section for protecting the end of the convex machining surface without direct involvement in machining, the non-machining section being adjacent to the convex machining surface of the drum-shaped tool.  
   
   
       7 . The free curved surface precision machining tool according to  claim 6 , wherein the non-machining section is made of material wearing out more easily than a grindstone bonding material so as not to damage the surface to be machined and includes a conductive material in its material.  
   
   
       8 . The free curved surface precision machining tool according to  claim 1 , further comprising an impeller disposed on both sides or one side of the drum-shaped tool and a flow channel for emitting a jet of fluid to the impeller in the rotative direction, wherein the drum-shaped tool is rotationally driven around the orthogonal axis x.  
   
   
       9 . The free curved surface precision machining tool according to  claim 1 , further comprising a belt in contact with the outer peripheral surface of the drum-shaped tool and a pulley for holding the belt between the pulley and the drum-shaped tool, wherein the drum-shaped tool is rotationally driven around the orthogonal axis x by rotation of the belt.  
   
   
       10 . The free curved surface precision machining tool according to  claim 9 , wherein the belt has a polishing surface on the side in contact with the outer peripheral surface so as to correct the convex machining surface of the drum-shaped tool as soon as the drum-shaped tool begins to be rotationally driven.  
   
   
       11 . The free curved surface precision machining tool according to  claim 6 , further comprising a pulley in contact with the outer peripheral surface of the non-machining section and a belt for rotationally driving the pulley, wherein the drum-shaped tool is rotationally driven around the orthogonal axis x by rotation of the pulley.  
   
   
       12 . The free curved surface precision machining tool according to  claim 1 , further comprising a driven gear disposed on both sides or one side of the drum-shaped tool and a main driving gear for driving the driven gear, wherein the main driving gear is belt-driven so as to rotationally drive the drum-shaped tool around the orthogonal axis x.  
   
   
       13 . The free curved surface precision machining tool according to  claim 1 , further comprising correction means for correcting the convex machining surface of the drum-shaped tool.  
   
   
       14 . The free curved surface precision machining tool according to  claim 13 , wherein the correction means is formed of grindstone, electrolysis, or discharge means or combined means thereof.  
   
   
       15 . The free curved surface precision machining tool according to  claim 12 , wherein the correction means functions simultaneously with the machining of material to be machined.