Patent Publication Number: US-2009238651-A1

Title: Adjustable center high tool holder head

Description:
BACKGROUND OF THE INVENTION 
     This present invention relates to the tool holder for cutting insert for CNC lathe machine and more practical for adjustment of the center high of the tool holder head. The precise center high of cutting insert of the tool holder axis is known to be necessary in order to increase cutting inserts life and leave no tip in the center of the facing parts. Its unique designed allows easy adjustment of the center high axis of a tool holder by flexible head. 
     SUMMARY OF THE INVENTION 
     The present invention relates to the tool holder for holding cutting insert. The tool holder is to provide an easy adjustment of center high of cutting insert, comprises: an adjustable head having a slot cut through one wall of the hole for flexible head, two Screws passing through two internally threaded holes in the head, a set screw pushing up the tool holder head for adjusting the higher center line and a socket head cap screw for clamping down the tool holder head for adjusting the lower center line; and tightening the tool holder head. The cutting insert is held in place by a socket button head cap screw clamp, which applies two ways forces against the bottom insert support surface and the angular side walls of an insert receiving pocket. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is an exploded side perspective view of tool holder according to the present invention. 
         FIG. 2  is multiple sectional views of the tool holder and the socket button head cap screw shows un-clamp position. 
         FIG. 3  is a view similar to  FIG. 2 , but showing the socket button head cap screw in clamping position. 
         FIG. 4  is a view similar to  FIG. 3 , but showing adjustable head by hidden lines. 
         FIG. 5  is a front view of the tool holder 
         FIG. 6  is a view similar to  FIG. 1  but has the insert-shim  8 . 
         FIG. 7  is a view similar to  FIG. 2  but has the insert-shim  8 . 
         FIG. 8  is a view similar to  FIG. 3  but has the insert-shim  8 . 
         FIG. 9  is a view similar to  FIG. 4  but has the insert-shim  8 . 
         FIG. 10  is an enlarge cross-view of the clamp socket button head cap screw. 
         FIG. 11  and  FIG. 12  are side view of the prior art 
     
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
     As showing  FIG. 1  and  FIG. 6  is similar but  FIG. 6  having a insert shim  8 , schematically illustrates the tool holder for used on CNC lathe or conventional lathe machines. The adjustable center high tool holder head comprises: a tool holder body square or rectangle shank  1 , an adjustable head  4  including the insert receiving pocket comprise a bottom supporting seat  11 A, and three side surfaces upstanding  11 , include angular of 35 degree (VN style), or 55 degree (DN style), or 80 degree (CN style), or 60 degree (TN style) and 80 degree (WT style) from the bottom supporting seat  11 A, a clearance recess arc  12  hole  5  having a center line  16  situated in the bottom support seat surface  11 A, the clearance recess  14  for the radius nose of cutting insert, a slot  2  cut through one wall of the hole  3 , created a thin wall at upper surface  3 A for flexible head  4 , a socket set screw  6 , a socket head cap screw  7 , and an insert 
     shim  8 , a cutting insert  9 , a clamp socket head cap screw  10   
     As showing in  FIG. 2  the center of the counter bore  5 A and the internally threaded hole  5  having a center line  16 , the cutting insert hole  9  having a center line  15 , the center lines  15  and  16  is off set as shown, the special clamp socket button head cap screw  10  just begin tightening, the screw shoulder  10 A is touching upper hole of cutting insert  9  and the annular neck  10 B is straight. 
     As showing in  FIG. 3  the cutting insert  9  is held in place by a special socket button head cap screw  10 , when the screw  10  is finally tightening down the screw flange  10 C forces, clamps the cutting insert against the bottom surface of receiving pocket  11 A while the annular neck  10 B is bend create forces to the shoulder  10 A against the angular side of three walls  11  ( FIG. 1 ) causes by off set of center lines  15  and  16  illustrated in  FIG. 3   
     As showing in  FIG. 4  to adjust the center high of cutting insert nose  21  and tighten the tool holder head  4 , the two Screws  6  and  7  passing through two internally threaded holes  6 A and  7 A, a socket set screw  6  pushing up the adjustable head  4  and a socket head cap screw  7  for clamping the adjustable head  4  against the pushing up forces of the socket set screw  6 . 
     As showing in  FIG. 5  is a front view of tool holder, a socket head cap screw  7 , a socket set screw  6 . As the prior art illustrated in  FIG. 11  when the cutting insert nose  21  is matching the facing of a center line  20 , leave no tip at the center. As the prior art illustrated in  FIG. 12  when the cutting insert nose  21  is lower than facing of a center line  20  there will leave a tip  22  at the center. 
     As showing in  FIG. 10  a special socket button head cap screw  10  Included socket hex or torx  1 C, a button head flange  10 C, an annular shoulder  10 A and the annular shoulder diameter is same as the major diameter of the threaded  7 C, a annular flexible neck  10 B and the annular neck diameter is same as the minor of the thread  7 B, the fillet radius  8 C and fillet radius  3 C to prevent from crack. The fillet radius  6 C the taper  6 D and the fillet radius  6 F is helping the screw bend easily when the screw tightening down. 
     As showing in  FIG. 7  is similar as  FIG. 2  but  FIG. 7  having a shim insert  8 . 
     As showing in  FIG. 8  is similar as  FIG. 3  but  FIG. 8  having a shim insert  8 . 
     As showing in  FIG. 9  is similar as  FIG. 4  but  FIG. 9  having a shim insert  8 .