JPS6357026U - - Google Patents

Description

【図面の簡単な説明】[Brief explanation of the drawing]

第１図は本考案に係るヘリカルブローチの一実
施例において１条の各スプライン刃における各切
刃を模式的に示す説明図、第２図はヘリカルブロ
ーチの概略構成を示す部分省略正面図、第３図は
荒刃群の切削機構説明図、第４図はヘリカルブロ
ーチの使用態様図、第５図は従来技術によつて形
成される１条の各スプライン刃における各切刃を
模式的に示す説明図である。 １…仕上刃群、１_１…第１仕上刃群、１_２…第
２仕上刃群、２…スプライン刃、２_１…第１仕上
刃群のスプライン刃、２_２…第２仕上刃群のスプ
ライン刃、３_１…第１仕上刃群のスプライン刃の
切刃、３_２…第２仕上刃群のスプライン刃の切刃
、４_１…第１仕上刃群のスプライン刃の案内刃、
４_２…第２仕上刃群のスプライン刃の案内刃、５
…鋭角側側部、６…鈍角側側部、θ_１…鋭角側側
部に形成される切刃の側面逃げ角、θ_２…鈍角側
側部に形成される切刃の側面逃げ角、θ_３，θ_４
…それぞれの案内刃の側面逃げ角。 FIG. 1 is an explanatory diagram schematically showing each cutting edge of each spline blade in an embodiment of the helical broach according to the present invention, FIG. 2 is a partially omitted front view showing the schematic structure of the helical broach, and FIG. Figure 3 is an explanatory diagram of the cutting mechanism of the rough blade group, Figure 4 is a diagram of how the helical broach is used, and Figure 5 is a schematic diagram of each cutting edge in each spline blade formed by the conventional technique. It is an explanatory diagram. 1... Finishing blade group, 1 ₁ ... First finishing blade group, 1 ₂ ... Second finishing blade group, 2... Spline blade, 2 ₁ ... Spline blade of the first finishing blade group, 2 ₂ ... Second finishing blade group Spline blade, 3 ₁ ... Cutting edge of the spline blade of the first finishing blade group, 3 ₂ ... Cutting edge of the spline blade of the second finishing blade group, 4 ₁ ... Guide blade of the spline blade of the first finishing blade group,
4 ₂ ...Guide blade of spline blade of second finishing blade group, 5
...acute side side part, 6...obtuse side side part, θ ₁ ... side relief angle of the cutting edge formed on the acute side side part, θ ₂ ... side relief angle of the cutting edge formed on the obtuse side side part, θ ₃ , θ ₄
...Side clearance angle of each guide blade.

Claims (1)

【実用新案登録請求の範囲】 (1) 螺旋状に配列された仕上刃群１の各条のス
プライン刃２が、該仕上刃群１の略前半部となる
第１仕上刃群１_１と略後半部となる第２仕上刃群
１_２とを構成し、 前記第１仕上刃群１_１のスプライン刃２_１は、
その鋭角側側部５または鈍角側側部６のいずれか
一方の同側部に、切り込み段差を有する切刃３_１
を形成するとともに他方の同側部に、切り込み段
差が０の案内刃４_１を形成し、 前記第２仕上刃群１_２のスプライン刃２_２は、
前記第１仕上刃群１_１とはそれぞれ逆の同側部に
切刃３_２および案内刃４_２を形成し、 前記切刃３_１および３_２のうち鈍角側側部６に
形成される切刃の側面逃げ角θ_２を鋭角側側部５
に形成される切刃の側面逃げ角θ_１より大きく設
定し、 前記案内刃４_１および４_２の側面逃げ角θ_３お
よびθ_４を０°より大きく且つ前記鋭角側側部５
の切刃の側面逃げ角θ_１より小さく設定したこと
を特徴とするヘリカルブローチ。 (2) 前記切刃３_１および３_２の側面逃げ角θ_１
およびθ_２は２０′以上１°以下の範囲で設定さ
れ、前記案内刃４_１および４_２の側面逃げ角θ_３
およびθ_４は０°を超え２０′以下の範囲で設定
される実用新案登録請求の範囲第１項記載のヘリ
カルブローチ。[Claims for Utility Model Registration] (1) Each spline blade 2 of the finishing blade group 1 arranged in a spiral is a first finishing blade group 1 which is approximately the front half of the finishing blade group ₁ . The spline blades 2 1 of the first finishing blade group 1 1 constitute the second finishing blade group 1 ₂ which is the latter half, and the spline blades _{2 1 of} the first finishing blade group 1 1 are
The cutting blade 3 ₁ has a cutting step on either the acute side 5 or the obtuse side 6.
and a guide blade 4 ₁ with a cutting step of 0 is formed on the other same side, and the spline blade 2 ₂ of the second finishing blade group 1 ₂ is
A cutting blade 32 and a guide blade 42 are formed on the same side opposite to the first finishing blade group ₁₁ , and a cutting blade ₃₂ and a guide blade ₄₂ are formed on the obtuse side side 6 of the cutting blades ₃₁ and ₃₂ . The side relief angle θ ₂ of the blade is set to the acute side 5
The side relief angles θ ₃ and θ 4 of the guide blades 4 ₁ and 4 ₂ are set larger than 0°, and the side relief angles θ ₃ and θ ₄ of the guide blades 4 1 and 4 2 are set larger than 0°, and
A helical broach characterized in that the side relief angle θ of the cutting edge is set smaller than ₁ . (2) Side relief angle θ ₁ of the cutting edges 3 ₁ and 3 ₂
and θ ₂ is set in the range of 20′ or more and 1° or less, and the side clearance angle θ ₃ of the guide blades 4 ₁ and 4 ₂
and θ ₄ is set in a range of more than 0° and less than 20', the helical brooch according to claim 1, which is a registered utility model.