JPS5937169B2 - Tokushiyuhagata Hob - Google Patents

Tokushiyuhagata Hob

Info

Publication number
JPS5937169B2
JPS5937169B2 JP50154215A JP15421575A JPS5937169B2 JP S5937169 B2 JPS5937169 B2 JP S5937169B2 JP 50154215 A JP50154215 A JP 50154215A JP 15421575 A JP15421575 A JP 15421575A JP S5937169 B2 JPS5937169 B2 JP S5937169B2
Authority
JP
Japan
Prior art keywords
wear
cutting
cutting edge
edge
hob
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
JP50154215A
Other languages
Japanese (ja)
Other versions
JPS5276795A (en
Inventor
寛治 島村
百郎 奈良
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
AZUMI KK
Original Assignee
AZUMI KK
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by AZUMI KK filed Critical AZUMI KK
Priority to JP50154215A priority Critical patent/JPS5937169B2/en
Publication of JPS5276795A publication Critical patent/JPS5276795A/en
Publication of JPS5937169B2 publication Critical patent/JPS5937169B2/en
Expired legal-status Critical Current

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  • Gear Processing (AREA)

Description

【発明の詳細な説明】 本発明は特殊刃形ホブに関するもので、その目的とする
ところは歯切創成において、従来から刃先丸み部と側面
切刃部との境界かど部に切屑の流れが合流して折目立上
りを起し、この部分に大きいかど磨耗が発生することが
多かったが、このようなかど磨耗の発生を防止して切削
抵抗を減少し、ホブの耐磨耗性、耐久性を向上させ、高
能率な歯切加工を可能とし、ざらにホブ切り精度が高く
、ホブ製作上研削加工が容易な特殊刃形ホブを提供しよ
うとするものである。
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a hob with a special blade shape, and its purpose is to prevent the flow of chips from converging at the boundary corner between the rounded part of the cutting edge and the side cutting part in gear cutting. However, by preventing the occurrence of such corner wear and reducing cutting resistance, the hob's wear resistance and durability have been improved. The purpose of the present invention is to provide a hob with a special blade shape that improves gear cutting, enables highly efficient gear cutting, has high hobbing accuracy, and is easy to grind during hob manufacturing.

従来、比較的小モジュールから大型モジュールに至るホ
ブとしては、組立式、一体式或いは超硬付刃ホブ等があ
るが、これらのホブの歯形は現在に至っても変っていな
い。
Hitherto, hobs ranging from relatively small modules to large modules have been assembled, integrated, or with carbide blades, but the tooth profiles of these hobs have not changed to date.

これは被削歯車の歯形形状から色々と制約を受け、各寸
法を満足させる上でホブ又はフライスの歯形はおのずと
定まり現在の基本形状を構成しているからである。
This is because there are various constraints imposed by the tooth profile shape of the gear to be cut, and the tooth profile of the hob or milling cutter is naturally determined and constitutes the current basic shape in order to satisfy each dimension.

しかし、切削工具による切削機構上、その歯形に「かど
」があると、かど部の逃げ面磨耗が他の切刃部に較べて
大きいことは良く知られている。
However, it is well known that when a cutting tool has a "corner" in its tooth profile, flank face wear at the corner is greater than at other cutting edge parts.

又、これとは別にホブの刃先丸み部と側面切刃部との境
界かと部に異常に大きい層線が発生する。
In addition, an abnormally large layer line occurs at the boundary between the rounded edge of the hob and the side cutting edge.

この磨耗は刃先丸み部に大きく、側面切刃部には小さい
This wear is large on the rounded part of the cutting edge and small on the side cutting edge.

極端な状態ではこの磨耗によって切削抵抗が倍加するば
かりでなく、被削歯車精度の低下、工具切刃の一部分の
大きな磨耗が生じ、この磨耗に基く正常な方形を含めて
の刃付研削を必要とし、高価なホブの寿命を一段と縮め
る等の難点がみられた。
In extreme conditions, this wear not only doubles the cutting resistance, but also reduces the precision of the gear being cut and causes significant wear on a portion of the cutting edge of the tool, making it necessary to grind the tool, including the normal square shape, based on this wear. However, there were drawbacks such as further shortening the lifespan of expensive hobs.

ホブ装作上からみると第4図ζこ示すようにホブ方形1
に対し研削砥石2がかけられ、砥石成形部が刃先丸み部
aのアール部を砥石逃げ角3をあけるようにした状態で
研削しなければならない。
Hob installation When viewed from above, the hob square 1 is shown in Figure 4.
The grinding wheel 2 is applied to the grinding wheel 2, and the grinding wheel forming part must grind the radiused part of the rounded part a of the cutting edge with the grinding wheel relief angle 3 open.

従って、刃先丸み部aと側刃切刃部Cとの境界かど部b
?こ大きいかどが生じ、この部分による切削によりかど
磨耗が発生する。
Therefore, the boundary corner b between the rounded part a of the cutting edge and the side cutting edge part C
? A large corner is formed, and cutting by this portion causes corner wear.

かど磨耗の発生する切削部分を第5図イ2口に示す。The cutting part where edge wear occurs is shown in Fig. 5 A2.

すなわち、イは下向切削の場合、口は上向切削の場合で
あるが、切刃稜で歯みぞが削られると切屑は切削力によ
りせん断変形やそ性愛形をうけてすくい面を流出し始め
る。
In other words, A is for downward cutting and the mouth is for upward cutting, but when the tooth groove is scraped at the cutting edge, the chips are sheared and distorted by the cutting force and flow out of the rake face. start.

第6図に切くず流れのモデルを示すように切先1bab
より流出した切屑はbb線を通過するまでに左右の歯面
より広がるのを制限されて20.1%縮まねばならない
As shown in Figure 6, the chip flow model is
The more flowing chips are restricted from spreading beyond the left and right tooth flanks and must shrink by 20.1% before passing the bb line.

この両歯面よりの側圧と切削力とにより切屑はすくい面
をえぐるように座屈しながら流れるので、刃先部の三カ
月状クレータ磨耗の成因となることが理解できる。
This lateral pressure and cutting force from both tooth surfaces causes the chips to flow while buckling as if gouging the rake face, which can be understood to be the cause of crescent-shaped crater wear on the cutting edge.

側刃bcより強い切屑が合流するときは、刃先部bab
よりの切屑の流れはbb線ですくい面に垂直に立上り、
側刃bcよりは切刃稜から直ちに立上る「流出モデル」
を考えると、切屑同志の干渉力は釣合うことになる。
When chips stronger than the side blade bc merge, the cutting edge bab
The flow of chips during twisting rises perpendicularly to the rake face at the bb line.
"Outflow model" that rises immediately from the cutting edge ridge rather than the side blade bc
Considering this, the interference power of the chips will be balanced.

第7図に示すように、刃先よりの流れは両かどを結ぶ紳
で湾曲してそり上り、流出方向が異なる側刃からの流れ
とはかど部すを折り目として合流している。
As shown in Fig. 7, the flow from the cutting edge curves up at the edge connecting both corners, and merges with the flow from the side edges, which flow in different directions, at the edge.

この時かと部が所謂かどになっている時には第6図tで
示すように1つ前の刃が削った切り口かと部の切削厚さ
がうずくなるので折り目になり磨耗の誘因となり易い。
At this time, when the heel has a so-called corner, as shown in FIG. 6 t, the cutting thickness of the cut heel made by the previous blade becomes rough, which tends to create creases and cause wear.

第8図のイ22ロ、ハ第7図の刃先中央、かど部、側刃
部に応じた方形に直角断面で示した切屑の流れを表わす
もので、イ及びハでは削られた切屑は流出するが刃先丸
み部aのアールと側面切刃部Cとが接する境界かど部す
では歯面4が削られると直ちに5のように立上らねばな
いない。
A22B and C in Figure 8 represent the flow of chips shown in a rectangular section at right angles to the center, edge, and side edges of the cutting edge in Figure 7. In A and C, the cut chips flow out. However, at the boundary corner where the radius of the rounded part a of the cutting edge and the side cutting edge part C contact, the tooth surface 4 must immediately rise as shown in 5 when it is ground.

切削速度が速いか、被剛材が硬いような場合には4から
5に立上るためのせん断やそ性変形を5によって阻害さ
れ、4の下端は圧縮により高圧になるものと考えられる
If the cutting speed is high or the material to be rigid is hard, the shearing and warping deformation caused by rising from 4 to 5 will be inhibited by 5, and the lower end of 4 will be under high pressure due to compression.

第9図はかと磨耗の初期とその成長を示すもので、歯車
材としてSCM3.HB160を用い、かど磨耗が生じ
にくい条件にしたもので、すくい面上の流出が妨げられ
る部分の切削痕幅は0.2 mm程度の微少な広さであ
リイ、この部分の切刃稜がかすかに白く光るようになっ
たとき、工具顕微鏡で観察するとかど部と稜の微少な「
欠け」が発生していた口。
Figure 9 shows the initial stage of heel wear and its growth, using SCM3. Using HB160, the conditions were such that edge wear was difficult to occur, and the width of the cutting marks on the rake face where flow was impeded was as small as 0.2 mm, and the edge of the cutting edge in this area was When it starts to glow faintly white, when you observe it with a tool microscope, you can see minute "
The mouth where "chip" had occurred.

異常なかと磨耗ハ、二に示すように上記欠は口が成長し
て生じたもの推察できる。
As shown in Figure 2, it can be assumed that the above defects are caused by the growth of the mouth.

上記からかと磨耗は刃先部ならびに左右側刃からの切屑
がかど部を折り目に3方向に曲がるとき、折り目となる
微少部分で切屑の流出が妨げられるため切刃稜が欠ける
ことにより発生し、この穴を切削されずに通過する歯車
材のこすりにより成長することが判明した。
The above-mentioned chattering wear occurs when the chips from the cutting edge and the left and right side blades bend in three directions at the creases, and the tiny parts that form the creases prevent the outflow of chips, resulting in chipping of the cutting edge. It was found that the growth occurs due to the scraping of the gear material that passes through the hole without being cut.

第10図にかど磨耗の進行状態を示したが実験1.rt
14.Z33の場合と実験2 y m 3 t Z42
の場合を比較した。
Figure 10 shows the progress of edge wear in Experiment 1. rt
14. Case of Z33 and Experiment 2 y m 3 t Z42
The cases were compared.

急激に発生したかど部における磨耗が一定の磨耗領域に
達したとき、かど磨耗と刃先中央磨耗を較べると、かど
磨耗の方が大きく差がついている。
When the sharply occurring wear at the edge reaches a certain wear range, when we compare the edge wear and the center wear of the cutting edge, there is a larger difference in the edge wear.

しかし磨耗の成長はそれ以上急速には伸びず緩やかな曲
線を以って成長していくことがわかる。
However, it can be seen that the growth of wear does not grow any more rapidly, but instead grows along a gentle curve.

本発明は歯切工具の寿命を大きく左右する方形の「かど
」磨耗を皆無とし、方形全体を平均した最小の磨耗にと
どめることによって歯切工具の寿命を延ばし、耐久性、
耐磨耗性を向上し高能率な歯切加工を実現できる特殊方
形構成を提供するものである。
The present invention eliminates the "corner" wear of the square, which greatly affects the life of the gear cutting tool, and keeps the average wear of the entire square to a minimum, thereby extending the life of the gear cutting tool and improving durability.
It provides a special rectangular configuration that improves wear resistance and realizes highly efficient gear cutting.

本発明では、刃先丸み部aと側面切刃ErfAcとが接
する個所としての境界かど部すに面取落し部や波形部を
形成したもので、この境界かど部すは通常アデンダムに
おいて刃先先端から1/3程度の位置を指す。
In the present invention, a chamfered part or a corrugated part is formed in the boundary corner where the rounded part a of the cutting edge and the side cutting edge ErfAc come into contact. /3 point.

第1図は本発明の代表的な面取落しホブの方形を示し、
小形歯車の仕上剤りに用いる。
FIG. 1 shows the square shape of a typical chamfer hob of the present invention.
Used as a finishing agent for small gears.

従来のかど部に肖る部分にh−h’の幅をもった面取落
し部6を形成した。
A chamfered portion 6 having a width of hh' is formed in a portion corresponding to a conventional corner portion.

αlの角度で面取りをしである。本発明特殊刃形ホブを
使用することにより、第2図、第3図イ刃先丸み部、口
面取落し部、ハ側面切刃部に示すように、切屑を刃先丸
み部aと側面切刃部Cとに分離することによって、折り
目立上り部のない滑らかな切屑の流出状態が得られた。
It is chamfered at an angle of αl. By using the special edge shape hob of the present invention, chips can be removed from the rounded edge part a and the side cutting edge as shown in Figures 2 and 3. By separating into part C, a smooth flow of chips with no rising creases was obtained.

このように、従来のかど部に変わる幅h−h’部を最初
から基準方形構成に取入れることによって切屑の流出を
妨げていた折り目、立上り部を皆無とした。
In this way, by incorporating the width h-h' portion, which replaces the conventional corner portion, into the standard square configuration from the beginning, creases and rising portions that obstruct the outflow of chips are completely eliminated.

尚、本発明ホブの研削加工については、第4図において
、ホブ方形を点線形に切落すことにより容易に行なうこ
とができ、従来の加工問題も解消することができた。
Incidentally, the grinding process of the hob of the present invention can be easily carried out by cutting off the hob rectangle in a dotted line as shown in FIG. 4, and the problems of conventional machining can also be solved.

第11図に示した例は形成された波形部の位相をずらせ
た切刃を順次歯条方向に交互に配置したものである。
In the example shown in FIG. 11, the cutting edges of the formed corrugated portions are sequentially arranged alternately in the tooth direction.

7は波形部、8は位相をずらせて歯条方向の次順位にあ
る波形部を示す。
Reference numeral 7 indicates a waveform portion, and 8 indicates a waveform portion in the next order in the tooth direction with a phase shift.

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

第1図は本発明特殊刃形の一実施例を示す正面図、第2
図は本発明による切屑流れの斜視説明図、第3図イ9口
、ハはそれぞれ刃先丸み部、面取り落し部及び側面切刃
部における切屑流れ説明図、第4図はホブ方形と研削砥
石の位置関係説明図、第5図イ、幀マホブ切削方向によ
るかど磨耗の発生状態説明図、第6図は従来例の切屑流
れの説明図、第7図は同切屑流れの斜視説明図、第8図
イ。 口、ハは従来例の刃先丸み部、境界かど部及び側面切刃
部での切屑流れ説明図、第9図イ2口、ハ。 二はかと磨耗の初期と成長状態を示す説明図、第10図
はかと磨耗の進行状態を示すグラフ、第11図は歯条方
向で位相をずらせた波形部の正面説明図である。 1・・・・・・ホブ方形、6・・・・・・面取落し部、
7,8・・・・・・波形部、a・・・・・・刃先丸み部
、b・・・・・・境界かど部、C・・・・・・側面切刃
部。
Fig. 1 is a front view showing one embodiment of the special blade shape of the present invention;
The figure is a perspective explanatory diagram of the flow of chips according to the present invention. Figure 3 (a) and (c) are explanatory diagrams of the flow of chips at the rounded part of the cutting edge, the chamfered part, and the side cutting edge, respectively. Fig. 5A is an explanatory diagram of the occurrence of corner wear depending on the cutting direction of the mahob; Fig. 6 is an explanatory diagram of the chip flow in the conventional example; Fig. 7 is a perspective explanatory diagram of the same chip flow; Figure I. Figures 9 and 9 are explanatory diagrams of chip flow at the rounded edge, boundary corner, and side cutting edge of the conventional example. 2 is an explanatory diagram showing the initial stage and growth state of heel wear; FIG. 10 is a graph showing the progressing state of heel wear; and FIG. 11 is a front explanatory diagram of a corrugated portion whose phase is shifted in the tooth direction. 1... Hob square, 6... Chamfered part,
7, 8... Waveform part, a... Rounded edge part, b... Boundary corner part, C... Side cutting edge part.

Claims (1)

【特許請求の範囲】[Claims] 1 歯先丸み部aと側面切刃部Cとの境界かど部すを有
するホブにおいて、前記境界かと部に面取落し部或いは
波形部を形成したことを特徴とする特殊刃形ホブ。
1. A special blade hob having a boundary corner between a rounded tooth tip portion a and a side cutting edge portion C, characterized in that a chamfered portion or a corrugated portion is formed at the boundary corner.
JP50154215A 1975-12-22 1975-12-22 Tokushiyuhagata Hob Expired JPS5937169B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP50154215A JPS5937169B2 (en) 1975-12-22 1975-12-22 Tokushiyuhagata Hob

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP50154215A JPS5937169B2 (en) 1975-12-22 1975-12-22 Tokushiyuhagata Hob

Publications (2)

Publication Number Publication Date
JPS5276795A JPS5276795A (en) 1977-06-28
JPS5937169B2 true JPS5937169B2 (en) 1984-09-07

Family

ID=15579346

Family Applications (1)

Application Number Title Priority Date Filing Date
JP50154215A Expired JPS5937169B2 (en) 1975-12-22 1975-12-22 Tokushiyuhagata Hob

Country Status (1)

Country Link
JP (1) JPS5937169B2 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010082786A (en) * 2008-10-02 2010-04-15 Nissan Motor Co Ltd Hob cutter and method for manufacturing gear
CN103551674A (en) * 2013-10-21 2014-02-05 合肥工业大学 Pre-grinding hob for machining micro-segment gears

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS509196A (en) * 1973-05-29 1975-01-30

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5214313Y2 (en) * 1972-10-02 1977-03-31

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS509196A (en) * 1973-05-29 1975-01-30

Also Published As

Publication number Publication date
JPS5276795A (en) 1977-06-28

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