JP2008178978A5

JP2008178978A5 -

Info

Publication number: JP2008178978A5
Application number: JP2008110606A
Authority: JP
Filing date: 2008-04-21
Publication date: 2009-02-26
Anticipated expiration: 2022-09-27

Claims

A tool body having a substantially cylindrical shape;
  The tip of the tool body is composed of a tip body having a top surface having a short side and a long side, a seating surface, and a side surface, and a short side cutting edge at an intersecting ridge formed by the side surface and the top surface. First and second chips provided with long edge cutting edges;
With
  The first tip is attached to the tool body with the long side cutting edge as an outer peripheral blade, the short side cutting edge as a bottom blade, and the second tip has the long side cutting edge as a bottom blade, A throw-away end mill attached to the tool body with a short edge as an outer peripheral edge,
  In the first tip, the bottom blade has a concave shape that gradually decreases toward the central portion in the front end surface view of the tool body,
  A breaker wall provided on the upper surface along the bottom blade;
  A recess located on the upper surface between the breaker wall and the bottom blade and formed along the bottom blade and recessed toward the seating surface;
Is formed,
  The breaker wall is located at a portion where the width of the upper end of the breaker wall and the bottom blade in the thickness direction of the tip body is widest when viewed from the front end surface of the tool body. And having a wide part where the width in the thickness direction of the chip body is widest,
  A throw-away end mill, wherein rake angles at both ends of the bottom blade are larger than other portions of the bottom blade.

A tip used as the first tip of the throw-away end mill according to claim 1 ,
A chip body comprising an upper surface, a seating surface and side surfaces;
A cutting blade that is provided at the crossing ridge formed by the upper surface and the side surface, and has a concave shape that gradually decreases toward the center,
A breaker wall provided on the upper surface along the cutting edge;
A recess located on the upper surface between the breaker wall and the cutting edge and formed along the cutting edge and recessed toward the seating surface;
With
In the side view on the cutting edge side, the breaker wall is located at a portion where the upper end of the breaker wall and the cutting edge are widest in the thickness direction of the chip body, and the upper end of the breaker wall and the bottom of the recess And having a wide portion where the width in the thickness direction of the chip body is the largest,
A tip for a throw-away end mill, wherein a rake angle at both end portions of the cutting blade is larger than other portions of the cutting blade.

The breaker wall has a vertex at the highest width from the placement surface in the wide portion in a side view on the cutting edge side, and a height from the placement surface from the vertex toward both ends. The tip for a throwaway end mill according to claim 2 , wherein becomes gradually lower.

The tip for a throw-away end mill according to claim 2 or 3 , wherein the bottom of the recess has the lowest position corresponding to the wide portion of the breaker wall.

The tip for a throwaway end mill according to any one of claims 2 to 4 , wherein the breaker wall has a convex shape that gradually approaches the cutting edge toward a wide portion of the breaker wall in a top view.

The chip includes a breaker projection including the breaker wall and an inclined surface that gradually decreases in height with respect to the seating surface of the chip body in the direction opposite to the cutting edge with respect to the breaker wall as the distance from the breaker wall increases. The tip for a throwaway end mill according to any one of claims 2 to 5 , further comprising: