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Twist drill bit

A technology of twist drill and drill point angle, which is used in twist drills, repair drills, drilling tool accessories, etc., can solve problems such as tremor and long time, and achieve high-quality drilling

Active Publication Date: 2011-04-20
SUMITOMO ELECTRIC HARDMETAL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because drills with small point angles have long cutting edges, such drills often cause so-called chatter
Especially when drilling through holes, it takes a long time because the drill needs to be inserted deeply

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0043] The influence of the inclination angle γ of the secondary cutting edge relative to the rotation axis on the drilling quality in double-angle drills was studied. The specifications of the drill used in the test are as follows: Drill diameter D = Φ10 mm, the drill point angle of the main cutting edge is 120°, the drill point angle of the secondary cutting edge is 60°, and the diameter of the outer end of the main cutting edge d = 0.9 D, and the inclination angle γ of the minor cutting edge was changed as shown in Table 1.

[0044] The workpiece uses a 3mm thick CFRP plate. Cutting conditions were: cutting speed Vc=100 m / min, and feed speed f=0.05 mm / rev. Table 1 lists the experimental results.

[0045] In the row indicating tremor in Table 1, "+" indicates "no tremor occurred", "±" indicates "slight tremor occurred", and "-" indicates "tremor occurred". In the row indicating fuzzing, "+" means "no fuzzing occurs and the quality of the inner surface of the drilled hole ...

example 2

[0050] Next, the influence of the different drill point angle α2 of the secondary cutting edge of the double-angle drill on the drilling quality and top wear is studied. The specifications of the drill used in the test are as follows: drill diameter D = Φ6 mm, drill point angle α1 = 140° of the main cutting edge, and drill diameter d = 0.83D at the outer end of the main cutting edge.

[0051] The workpiece uses a 10mm thick CFRP plate. Cutting conditions were: cutting speed Vc=100 m / min, and feed speed f=0.05 mm / rev. Table 2 lists the experimental results.

[0052] In the row indicating fuzzing of Table 2, "+" means "no fuzzing occurs and the quality of the inner surface of the borehole is excellent", and "-" means "fuzzing occurs and the quality of the inner surface of the borehole is poor". Top wear was evaluated after 500 holes were drilled. The crown wear amount in the evaluation cell represents the maximum flank wear amount (mm).

[0053] [Table 2]

[0054]

[005...

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Abstract

Disclosed is a double-angled twist drill bit with which the finish quality is increased, without increasing the manufacturing effort. A secondary cutting edge (4b) is set nearly parallel to the rotational axis (O) of the drill bit, and at least the cutting face (10) of the cutting edge is constructed with a fluted surface with a helical flute (6). By concavely curving the fluted surface located along the leading edge (9) of the helical flute relative to the forward direction of rotation of the drill bit, a secondary cutting edge (4b) can be constructed with a minimal angle of offset from the rotational axis at the ridge line located at the intersection between the fluted surface and the flank of the clearance face.

Description

technical field [0001] The present invention relates to a double-angle twist drill comprising a cutting edge having a main cutting edge arranged near the center of rotation and a secondary cutting edge (peripheral cutting edge) connected to the outer end of the main cutting edge, the main cutting edge and the secondary cutting edge Available in different point angles. Background technique [0002] When drilling fiber-reinforced composite materials such as carbon fiber-reinforced plastic (CFRP), the smaller the point angle of the drill, the less fuzzing the reinforcing fibers of the workpiece will have. However, since drills with small point angles have long cutting edges, such drills often cause so-called chatter. Especially when drilling a through hole, it takes a long time because the drill needs to be inserted deeply. [0003] Double-angle twist drills have primary and secondary cutting edges with different point angles to limit the length of the cutting edge. Furtherm...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23B51/00
CPCB23B2251/085B23B2251/04B23B51/02B23B2251/14B23B2226/27B23B2226/275Y10T408/9097
Inventor 中村直宏阿部诚
Owner SUMITOMO ELECTRIC HARDMETAL CORP
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