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Ogawa hiroshi

A technology of drill bits and cutting parts, applied in the direction of manufacturing tools, metal processing equipment, drilling/drilling equipment, etc., can solve problems such as deterioration, deformation, surface roughness, stress (increased cutting torque, etc.), and achieve reduced clogging, excellent Effect of hole machinability and excellent fracture resistance

Active Publication Date: 2013-05-08
KYOCERA CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, in a drill in which the flutes meet in this way, the chips generated from each cutting edge tend to clog the part where the two flutes meet.
As a result, there is a possibility that the workpiece may be deteriorated or the inner wall of the machined hole may be deformed (deterioration of the surface roughness) due to the generation of heat at the junction due to clogged chips.
In addition, if the chips are clogged at the junction of the grooves, the stress (cutting torque) applied to this part during machining increases, and there is a possibility that the drill may be broken.
On the other hand, since the grooves cross each other at the junction of the flutes, the shape of the flutes changes, so the flow of chips passing through the flutes changes at the junction, and there is a risk of damaging the inner wall of the machining hole.

Method used

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  • Ogawa hiroshi
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Examples

Experimental program
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Effect test

no. 1 approach

[0016] Below, refer to Figure 1 ~ Figure 3 A first embodiment of the drill according to the present invention will be described in detail.

[0017] like figure 1 As shown, the drill 1 of the present embodiment has a main body 20 held by the rotating shaft of a machine tool and a cutting part 10 provided on one end side of the main body 20 . The main body portion 20 is a portion designed according to the shape of the rotary shaft of the machine tool. The cutting portion 10 is a portion that contacts the workpiece 30 .

[0018] The cutting portion 10 is a portion that plays a major role in cutting the workpiece 30 , and has a cylindrical shape in the present embodiment. That is, in a section perpendicular to the rotation axis O of the cutting portion 10, when the diameter of the front end portion 10a is T1 and the diameter of the portion other than the front end portion 10a is T2, T1 and T2 have a relationship of T1=T2. relation. In addition, the diameter of the cutting po...

no. 2 approach

[0036] Next, a drill according to a second embodiment of the present invention will be described. It should be noted that the basic structure is the same as that of the drill according to the first embodiment, so it is appropriate to refer to Figure 1 ~ Figure 3 while explaining.

[0037] The drill 1 according to this embodiment has a cylindrical cutting portion 10 and a main body portion 20 . The cutting part 10 has two cutting edges 11a, 11b arranged apart from each other at the front end 10a, and two grooves 12a, 12b respectively continuous with the two cutting edges 11a, 11b, extending helically toward the rear end 10b, and converging. In addition, the two grooves 12a and 12b respectively reach the bottom 12a3 as the depth from the outer periphery of the cutting part 10 increases away from the one end 12a1 in cross-section, and the depth decreases from the bottom 12a3 to the other end 12a2. In addition, the cutting portion has a curved first merging groove 12c that has ...

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PUM

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Abstract

A drill according to an embodiment of the present invention is provided with a main body portion and a columnar cutting portion. The cutting portion has two cutting blades disposed so as to be apart from each other on a front edge part, two grooves which are continuous to the two cutting blades, respectively, and are extended spirally toward a tail edge part, and a clearance which is extended spirally from a front edge part side toward a tail edge part side and is concave inwards in a cross-sectional view with an outer circumference of the cutting portion as a reference. In the cutting portion, at least one of the two grooves and the clearance are converged, and the cutting portion has a first convergence groove, the bottom surface of which is convex outwards in a curved shape in a cross-sectional view. A manufacturing method for a cutting work piece by using the drill is provided.

Description

technical field [0001] The present invention relates to a drill and a method of manufacturing a machined object using the drill. Background technique [0002] Conventionally, for example, Japanese Patent Application Laid-Open No. 2007-307642 discloses that, in a drill having two cutting edges and two curved grooves connected to each cutting edge at the front end of the main body, two curved The grooves merge into one groove at a position retreated by a predetermined amount from the front end of the main body. [0003] However, in a drill in which the grooves merge in this way, chips generated from the respective cutting edges tend to be easily clogged at the junction of the two grooves. As a result, the converging portion is heated due to the clogged chips, which may cause deterioration of the workpiece or deformation of the inner wall of the machined hole (deterioration of surface roughness). In addition, when the chips clog the converging portion of the grooves, the stre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23B51/00
CPCB23B2251/44B23B2251/406B23B51/02B23B2251/426Y10T408/9097Y10T408/03B23B51/011
Inventor 小川浩
Owner KYOCERA CORP