US2012264528A1PendingUtilityA1

Screw manufacturing method, whirling cutter, and screw manufacturing machine

Assignee: ISOBE KENJIPriority: Dec 25, 2009Filed: Dec 24, 2010Published: Oct 18, 2012

Est. expiryDec 25, 2029(~3.4 yrs left)· nominal 20-yr term from priority

Inventors:Kenji Isobe Taku Koike Naoki Ando Hiromichi Murata

B23G 5/18B23G 2200/10B23G 2240/60B23G 1/34A61B 2017/00526A61B 17/8625B23G 9/001B26D 1/14A61B 17/86A61B 17/58

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References

Claims

Abstract

A screw manufacturing method by thread whirling machining and others are provided which can solve problems due to thread rolling and cutting and which inhibits moving paths of inserts from interfering with a curved line of a desired screw upon going in and out, thereby providing the screw with a targeted curved line. In the method of manufacturing a screw, a mount angle of the screw is calculated by formulae below in case that a lead angle of the screw is different from the mount angle. mount angle=tan −1 {n ×pitch/(π× D 1)} (1) D 1={(screw valley diameter+screw outer diameter)/2}+Δ T (2) screw valley diameter≦ D 1≦screw outer diameter (3) in case ΔT>0, {(screw outer diameter−screw valley diameter)/2}×0.2<Δ T <{(screw outer diameter−screw valley diameter)/2} (4) in case ΔT<0, −{(screw outer diameter−screw valley diameter)/2}<Δ T <−{(screw outer diameter−screw valley diameter)/2}×0.2 (5) where D 1 ≠0, ΔT≠0, and n indicates a number of threads.

Claims

exact text as granted — not AI-modified

1 - 11 . (canceled) 
     
     
         12 . A screw manufacturing method for manufacturing a medical screw, the method using:
 an annular cutter member that has a plurality of inserts radially arranged and is rotatable on its rotation axis; and   a holding portion that holds a work piece for forming the medical screw and is rotatable, the cutter member being inclined with respect to an axial center of the work piece at a predetermined angle (mount angle),   the method comprising a step of calculating the mount angle by formulae (1), (2), (3), (4) and (5) below, when a lead angle of the medical screw is different from the mount angle:
   mount angle=tan −1   {n ×pitch/(π× D 1)}  (1)
 
     D 1={(screw valley diameter+screw outer diameter)/2 }+ΔT   (2)
 
   screw valley diameter≦ D 1≦screw outer diameter  (3)
 
   in case ΔT&gt;0,
   {(screw outer diameter−screw valley diameter)/2}×0.2 &lt;ΔT &lt;{(screw outer diameter−screw valley diameter)/2}  (4)
 
   in case ΔT&lt;0,
   −{(screw outer diameter−screw valley diameter)/2 }&lt;ΔT &lt;−{(screw outer diameter−screw valley diameter)/2}×0.2  (5)
 
   where D 1 ≠0, ΔT≠0, and n indicates a number of threads.   
     
     
         13 . The screw manufacturing method according to  claim 12 , wherein the ΔT is set to be within ranges of formulae (6) and (7) below:
 in case ΔT&gt;0,
   {(screw outer diameter−screw valley diameter)/2}×0.6 ≦ΔT ≦{(screw outer diameter−screw valley diameter)/2}  (6)
 
 
 in case ΔT&lt;0,
   −{(screw outer diameter−screw valley diameter)/2 }Δ≦T ≦−{(screw outer diameter−screw valley diameter)/2}×0.6  (7).
 
 
 
     
     
         14 . The screw manufacturing method according to  claim 12 , wherein the D 1  is set to be the outer diameter of the screw or the valley diameter of the screw. 
     
     
         15 . The screw manufacturing method according to  claim 13 , wherein the D 1  is set to be the outer diameter of the screw or the valley diameter of the screw. 
     
     
         16 . A screw manufacturing method for manufacturing a worm screw, the method using:
 an annular cutter member that has a plurality of inserts radially arranged and is rotatable on its rotation axis; and   a holding portion that holds a work piece for forming the worm screw and is rotatable, the cutter member being inclined with respect to an axial center of the work piece at a predetermined angle (mount angle),   the method comprising a step of calculating the mount angle by formulae (1), (2), (3), (4) and (5) below, when a lead angle of the worm screw is different from the mount angle:
   mount angle=tan −1   {n ×pitch/(π× D 1)}  (1)
 
     D 1={(screw valley diameter+screw outer diameter)/2 }+ΔT   (2)
 
   screw valley diameter≦ D 1≦screw outer diameter  (3)
 
   {(screw outer diameter−screw valley diameter)/2}×0.2 &lt;ΔT &lt;{(screw outer diameter−screw valley diameter)/2}  (4)
 
   in case ΔT&lt;0,
   −{(screw outer diameter−screw valley diameter)/2 }&lt;ΔT &lt;−{(screw outer diameter−screw valley diameter)/2}×0.2  (5)
 
   where D 1 ≠0, ΔT≠0, and n indicates a number of threads.   
     
     
         17 . The screw manufacturing method according to  claim 16 , wherein the ΔT is set to be within ranges of formulae (6) and (7) below:
 in case ΔT&gt;0,
   {(screw outer diameter−screw valley diameter)/2}×0.6 ≦ΔT ≦{(screw outer diameter−screw valley diameter)/2}  (6)
 
 
 in case ΔT&lt;0,
   −{(screw outer diameter−screw valley diameter)/2 }≦ΔT ≦{(screw outer diameter−screw valley diameter)/2}×0.6  (7).
 
 
 
     
     
         18 . The screw manufacturing method according to  claim 16 , wherein the D 1  is set to be the outer diameter of the screw or the valley diameter of the screw. 
     
     
         19 . The screw manufacturing method according to  claim 17 , wherein the D 1  is set to be the outer diameter of the screw or the valley diameter of the screw. 
     
     
         20 . A screw manufacturing method for manufacturing a metric screw thread, the method using:
 an annular cutter member that has a plurality of inserts radially arranged and is rotatable on its rotation axis; and   a holding portion that holds a work piece for forming the metric screw thread and is rotatable,
 the cutter member being inclined with respect to an axial center of the work piece at a predetermined angle (mount angle), 
   the method comprising a step of calculating the mount angle by formulae (1), (2) and (3) below, when a lead angle of the metric screw thread is different from the mount angle:
   mount angle=tan −1   {n ×pitch/(π× D 1)}  (1)
 
     D 1={(screw valley diameter+screw outer diameter)/2 }+ΔT   (2)
 
   screw valley diameter≦ D 1≦screw outer diameter  (3)
 
   where D 1 ≠0, ΔT≠0, and n indicates a number of threads.   
     
     
         21 . The screw manufacturing method according to  claim 20 , wherein the ΔT is set to be within ranges of formulae (6) and (7) below:
 in case ΔT&gt;0,
   −{(screw outer diameter−screw valley diameter)/2}×0.6 ≦ΔT ≦{(screw outer diameter−screw valley diameter)/2}  (6)
 
 
 in case ΔT&lt;0,
   −{(screw outer diameter−screw valley diameter)/2 }≦ΔT ≦{(screw outer diameter−screw valley diameter)/2}×0.6  (7).
 
 
 
     
     
         22 . The screw manufacturing method according to  claim 20 , wherein the D 1  is set to be the outer diameter of the screw or the valley diameter of the screw. 
     
     
         23 . The screw manufacturing method according to  claim 21 , wherein the D 1  is set to be the outer diameter of the screw or the valley diameter of the screw. 
     
     
         24 . An annular whirling cutter rotatable on its rotation axis comprising a plurality of inserts radially arranged,
 wherein the whirling cutter is inclined with respect to an axial center of a work piece for manufacturing a medical screw at a predetermined angle (mount angle), and,   in case that a lead angle of the medical screw is different from the mount angle, formulae (1), (2), (3), (4) and (5) below are satisfied:
   mount angle=tan −1   {n ×pitch/(π× D 1)}  (1)
 
     D 1={(screw valley diameter+screw outer diameter)/2 }+ΔT   (2)
 
   screw valley diameter≦ D 1≦screw outer diameter  (3)
 
   in case ΔT&gt;0,
   {(screw outer diameter−screw valley diameter)/2}×0.2 &lt;ΔT &lt;{(screw outer diameter−screw valley diameter)/2}  (4)
 
   in case ΔT&lt;0,
   −{(screw outer diameter−screw valley diameter)/2 }&lt;ΔT &lt;−{(screw outer diameter−screw valley diameter)/2}×0.2  (5)
 
   where D 1 ≠0, ΔT≠0, and n indicates a number of threads.   
     
     
         25 . An annular whirling cutter rotatable on its rotation axis comprising a plurality of inserts radially arranged,
 wherein the whirling cutter is inclined with respect to an axial center of a work piece for manufacturing a worm screw at a predetermined angle (mount angle), and,   in case that a lead angle of the worm screw is different from the mount angle, formulae (1), (2), (3), (4) and (5) below are satisfied:
   mount angle=tan −1 {n×pitch/(π× D 1)}  (1)
 
     D 1={(screw valley diameter+screw outer diameter)/2 }+ΔT   (2)
 
   screw valley diameter≦ D 1≦screw outer diameter  (3)
 
   in case ΔT&gt;0,
   −{(screw outer diameter−screw valley diameter)/2}×0.2 &lt;ΔT &lt;{(screw outer diameter−screw valley diameter)/2}  (4)
 
   in case ΔT&lt;0,
   −{(screw outer diameter−screw valley diameter)/2 }&lt;ΔT &lt;−{(screw outer diameter−screw valley diameter)/2}×0.2  (5)
 
   where D 1 ≠0, ΔT≠0, and n indicates a number of threads.   
     
     
         26 . An annular whirling cutter rotatable on its rotation axis comprising a plurality of inserts radially arranged,
 wherein the whirling cutter is inclined with respect to an axial center of a work piece for manufacturing a metric screw thread at a predetermined angle (mount angle), and,   in case that a lead angle of the metric screw thread is different from the mount angle, formulae (1), (2) and (3) below are satisfied:
   mount angle=tan −1   {n ×pitch/(π× D 1)}  (1)
 
     D 1={(screw valley diameter+screw outer diameter)/2 }+ΔT   (2)
 
   screw valley diameter≦ D 1≦screw outer diameter  (3)
 
   where D 1 ≠0, ΔT≠0, and n indicates a number of threads.   
     
     
         27 . A screw manufacturing machine comprising:
 an annular whirling cutter that has a plurality of inserts radially arranged and is rotatable on its rotation axis; and   a main spindle that coaxially holds a base of a work piece for manufacturing a medical screw and rotates the work piece,   wherein the whirling cutter is inclined with respect to an axial center of the work piece at a predetermined angle (mount angle), and,   in case that a lead angle of the medical screw is different from the mount angle, formulae (1), (2), (3), (4) and (5) below are satisfied:
   mount angle=tan −1   {n ×pitch/(π× D   1 )}  (1)
 
     D 1={(screw valley diameter+screw outer diameter)/2 }+ΔT   (2)
 
   screw valley diameter≦ D 1≦screw outer diameter  (3)
 
   in case ΔT&gt;0,
   {(screw outer diameter−screw valley diameter)/2}×0.2 &lt;ΔT &lt;{(screw outer diameter−screw valley diameter)/2}  (4)
 
   in case ΔT&lt;0,
   −{(screw outer diameter−screw valley diameter)/2 }&lt;ΔT &lt;−{(screw outer diameter−screw valley diameter)/2}×0.2  (5)
 
   where D 1 ≠0, ΔT≠0, and n indicates a number of threads.   
     
     
         28 . A screw manufacturing machine comprising:
 an annular whirling cutter that has a plurality of inserts radially arranged and is rotatable on its rotation axis; and   a main spindle that coaxially holds a base of a work piece for manufacturing a worm screw and rotates the work piece,   wherein the whirling cutter is inclined with respect to an axial center of the work piece at a predetermined angle (mount angle), and,   in case that a lead angle of the worm screw is different from the mount angle, formulae (1), (2), (3), (4) and (5) below are satisfied:
   mount angle=tan −1   {n ×pitch/(π× D 1)}  (1)
 
     D 1={(screw valley diameter+screw outer diameter)/2 }+ΔT   (2)
 
   screw valley diameter≦ D 1≦screw outer diameter  (3)
 
   in case ΔT&gt;0,
   {(screw outer diameter−screw valley diameter)/2}×0.2 &lt;ΔT &lt;{(screw outer diameter−screw valley diameter)/2}  (4)
 
   in case ΔT&lt;0,
   −{(screw outer diameter−screw valley diameter)/2 }&lt;ΔT &lt;−{(screw outer diameter−screw valley diameter)/2}×0.2  (5)
 
   where D 1 ≠0, ΔT≠0, and n indicates a number of threads.   
     
     
         29 . A screw manufacturing machine comprising:
 an annular whirling cutter that has a plurality of inserts radially arranged and is rotatable on its rotation axis; and   a main spindle that coaxially holds a base of a work piece for manufacturing a metric screw thread and rotates the work piece,   wherein the whirling cutter is inclined with respect to an axial center of the work piece at a predetermined angle (mount angle), and,   in case that a lead angle of the metric screw thread is different from the mount angle, formulae (1), (2) and (3) below are satisfied:
   mount angle=tan −1   {n ×pitch/(π× D 1)}  (1)
 
     D 1={(screw valley diameter+screw outer diameter)/2 }+ΔT   (2)
 
   screw valley diameter≦ D 1≦screw outer diameter  (3)
 
   where D 1 ≠0, ΔT≠0, and n indicates a number of threads.

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