JP2551651B2 - Turning brooch - Google Patents
Turning broochInfo
- Publication number
- JP2551651B2 JP2551651B2 JP1064094A JP6409489A JP2551651B2 JP 2551651 B2 JP2551651 B2 JP 2551651B2 JP 1064094 A JP1064094 A JP 1064094A JP 6409489 A JP6409489 A JP 6409489A JP 2551651 B2 JP2551651 B2 JP 2551651B2
- Authority
- JP
- Japan
- Prior art keywords
- segment
- finishing
- tip
- machining
- cutting
- 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 - Fee Related
Links
Landscapes
- Milling, Broaching, Filing, Reaming, And Others (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 この発明は、ピンミラーカッタに代えてクランクシャ
フトの円筒部（ピン・ジャーナル）を削るのに用いるブ
ローチ、特に、略円板状に形成されたボディの外周に分
割切刃を配列し、ボディを微速回転させながら送りをか
ける方式の旋削ブローチに関する。DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention is a broach used for cutting a cylindrical portion (pin journal) of a crankshaft in place of a pin mirror cutter, and particularly formed in a substantially disc shape. The present invention relates to a turning broach in which divided cutting blades are arranged on the outer periphery of a body and the body is fed at a very low speed.
周知の旋削ブローチの中に、分割切刃を有するもの、
即ち、工具の加工部を粗加工部、中仕上げ部、最終仕上
部等に分け、それぞれの加工部に複数のスローアウエイ
チップを被削域が分担切削されるように配列して取付け
たものがある。この種の旋削ブローチは、１枚刃タイプ
のブローチと違ってチップの振れ精度が仕上げ精度を左
右し、従って、仕上部の切刃は振れ精度を調整可能とな
してある。Among the well-known turning broaches, those with split cutting edges,
That is, the machining part of the tool is divided into a rough machining part, a semi-finishing part, a final finishing part, etc., and a plurality of throwaway tips are arranged and attached to each machining part so as to divide the work area. is there. In this type of turning broach, unlike a single-blade type broach, the runout accuracy of the tip affects the finishing accuracy, and therefore the runout accuracy of the cutting edge of the finish is adjustable.
ところが、この刃振れ精度の調整は、いずれも切刃チ
ップを個々に加工径方向に微移動させる方法で行なって
いるため、従来の旋削ブローチには下記の問題が生じて
いた。However, since the adjustment of the blade runout accuracy is performed by a method of slightly moving the cutting blade tips individually in the machining radial direction, the conventional turning broach has the following problems.
第２図に示す如きクランクシャフトＡは、高能率加工
のために複数の円筒部ａを図のように同時加工すること
がある。ところが、クランクシャフトは剛性が充分でな
いので各円筒部に同じ切削抵抗が作用しても場所によっ
て変形量が異なる。また、ワークを除去する体積はそれ
ぞれの円筒部で異なるため、切削熱の差で各ブローチの
熱膨脹量にも差が生じ、これ等が原因で、各ブローチの
工具径を一致させておくと、場所によって円筒部の仕上
げ寸法にバラツキが生じる。このバラツキは、仕上部の
切刃位置を調整すれば補正可能であるが、従来の方式に
よるとチップを個々に動かすため、効率的な調整が望め
ない。In the crankshaft A as shown in FIG. 2, a plurality of cylindrical portions a may be simultaneously processed as shown in the drawing for high efficiency processing. However, since the crankshaft does not have sufficient rigidity, the amount of deformation varies depending on the location even if the same cutting resistance acts on each cylinder. Further, since the volume for removing the work is different in each cylindrical portion, the difference in cutting heat also causes a difference in the thermal expansion amount of each broach, and due to these, if the tool diameter of each broach is made to match, The finishing dimension of the cylindrical part varies depending on the location. This variation can be corrected by adjusting the position of the cutting edge of the finish, but according to the conventional method, since the chips are individually moved, efficient adjustment cannot be expected.
この発明は、この問題点を解決して簡単な操作で高加
工精度が得られる旋削ブローチを提供しようとするもの
である。The present invention is intended to solve this problem and provide a turning broach that can obtain high processing accuracy with a simple operation.
この発明のブローチは、上記の問題点を無くすため、
略円板状となすボディの外周部を周方向に複数分割され
たセグメントで構成し、このセグメントを、円周上に座
面を有するセグメント支持部材の外周に位置決めして着
脱自在に取付ける。また、各々が分割刃の構成チップを
備えるセグメントのうち、最後にクランクシャフト円筒
部を仕上げる仕上げ用セグメントとセグメント支持部材
との間に仕上用セグメント全体を加工径方向に位置調整
する加工径方向位置調整機構を設け、さらに、仕上用セ
グメントに先行してクランクシャフト円筒部を加工する
中仕上用セグメントに、クランクシャフト円筒部の外周
を削る切刃チップの加工径方向位置調整機構を設ける。The brooch of the present invention eliminates the above problems,
An outer peripheral portion of a body having a substantially disc shape is composed of a plurality of segments divided in the circumferential direction, and the segments are removably attached to the outer periphery of a segment support member having a bearing surface on the circumference. Further, among the segments each of which has the constituent tips of the divided blades, the machining radial position for adjusting the position of the entire finishing segment in the machining radial direction between the segment supporting member and the finishing segment for finally finishing the crankshaft cylindrical portion. An adjusting mechanism is provided, and a medium-diameter segment for machining the crankshaft cylindrical portion prior to the finishing segment is provided with a machining-radial-position adjusting mechanism for a cutting blade tip that shaves the outer circumference of the crankshaft cylindrical portion.
なお、仕上用セグメントの側端部に設ける切刃チップ
は、セグメント本体にそのチップの径方向及び幅方向位
置調整ユニットを設けてこのユニットに取付けるのが望
ましい。The cutting edge tip provided on the side end of the finishing segment is preferably attached to the segment body by providing a radial and widthwise position adjusting unit of the tip on the segment body.
また、後述する理由から、仕上用セグメントの側端の
切刃チップは、コーナアールのみ、又はコーナアールと
これに続く微小長さのサラエ刃が有効刃となる刃形に
し、かつ、コーナアールのみが有効刃となるものについ
ては工具軸と直角面に対して側面側に１゜30′〜２゜3
0′の逃げ角を付し、一方、コーナアールに続いてサラ
エ刃を有するものについてはサラエ刃長さを3mm以下し
てそのサラエ刃に上記直角面とのなす角が10′〜40′の
傾きをつけるのが望ましい。In addition, for the reasons described below, the cutting edge tip at the side end of the finishing segment has a corner shape only, or a corner shape with a corner length followed by a Sarae blade of a minute length being an effective blade, and only the corner shape. For effective blades, 1 ° 30 'to 2 ° 3 on the side of the plane perpendicular to the tool axis
On the other hand, for those with a clearance angle of 0'and a Sarae blade following the corner, the Sarae blade length is 3 mm or less and the angle between the Sarae blade and the above-mentioned right-angled surface is 10 'to 40'. It is desirable to have a slope.
さらに、先行用セグメントの切刃チップのうち、送り
方向後尾のチップをセグメント本体に組付けた径方向位
置調整ユニットに取付けること、或いは、セグメント本
体のチップ座にねじ止めする各切刃チップの止めねじ挿
入孔を設けた側面中央部を、厚み方向（加工幅方向）に
凹ませてこの凹部に上記チップ座を進入させておくこと
は、ブローチの更なる信頼性向上に有効に作用する。Furthermore, of the cutting blade tips of the preceding segment, attach the tip of the trailing edge in the feed direction to the radial position adjustment unit that is assembled to the segment body, or fix each cutting blade tip by screwing to the tip seat of the segment body. It is effective to further improve the reliability of the broach that the center portion of the side surface provided with the screw insertion hole is recessed in the thickness direction (working width direction) and the tip seat is inserted into this recess.
仕上用セグメントとセグメント支持部材との間に設け
た加工径方向位置調整機構を操作すると、仕上用セグメ
ントの全切刃がセグメント本体と共に同時に加工径方向
に移動する。従って、クランクシャフトの変形量、工具
の熱膨脹量の差による加工径のバラツキの補正に必要な
仕上用セグメント全体の加工径調整は僅か１回の操作で
済む。When the machining radial position adjusting mechanism provided between the finishing segment and the segment support member is operated, all the cutting edges of the finishing segment move together with the segment body in the machining radial direction. Therefore, the adjustment of the machining diameter of the entire finishing segment necessary for correcting the variation of the machining diameter due to the difference between the deformation amount of the crankshaft and the thermal expansion amount of the tool can be performed only once.
また、中仕上用セグメントにクランクシャフト円筒部
の外周切削用切刃チップの加工径方向位置調整機構を具
体させたので、仕上用セグメントの切刃の加工径方向位
置調整によって生じる仕上代の変動を中仕上用セグメン
トの後尾の切刃の加工径方向位置調整によって吸収で
き、複数ブローチ間での仕上代を均一化して仕上精度に
バラツキが出ることを防止することができる。In addition, since the mechanism for adjusting the radial position of the cutting edge tip for cutting the outer periphery of the crankshaft cylinder is embodied in the medium finishing segment, the fluctuation of the finishing allowance caused by adjusting the radial position of the cutting edge of the finishing segment is adjusted. This can be absorbed by adjusting the machining radial position of the cutting blade at the tail of the middle finishing segment, and the finishing allowance can be made uniform among a plurality of broaches to prevent variations in finishing accuracy.
なお、請求項２の構成を付加すると、仕上用切刃の位
置を加工幅方向に調整して加工幅の精度を高めることが
できる。また、請求項３、４の構成は加工面粗さの改善
に役立つ。さらに、請求項５の構成は、後述するよう
に、仕上用セグメントの各刃の切削負担量を均一化する
のに役立つ。When the configuration of claim 2 is added, the position of the finishing cutting edge can be adjusted in the processing width direction to improve the accuracy of the processing width. Further, the structures of claims 3 and 4 are useful for improving the roughness of the machined surface. Furthermore, the structure of claim 5 is useful for equalizing the cutting load on each blade of the finishing segment, as will be described later.
以下、添付図面に基いてこの発明の旋削ブローチの一
具体例を説明する。A specific example of the turning broach of the present invention will be described below with reference to the accompanying drawings.
第１図及び第２図に示すように、ブローチ１は、軸心
と同心円の座面2a、その座面の中央部に突出させた周方
向突条2b、突条2bと直交する計５個の軸方向キー2cを有
するセグメント支持軸２と、周方向に複数に分割して軸
２の外周にボルト止めしたセグメント３、４、４′、
５、６と、２と６との間に設けたセグメント６の加工径
方向位置調整機構７とから成り、全体が略円板状になっ
ている。８は締結ボルトであり、このボルトによって固
定されるセグメントの各々は、突条2bとキー2cをこれ等
に対応して設けた溝に嵌合させて工具軸方向と周方向に
位置決めされている。また、これ等のセグメントは、３
がレスト溝を先行して削る先行部、４、４′がカウンタ
ーウエイト側面部を削る粗加工部、５がクランクシャフ
ト円筒部の外周とカウンターウエイト側面の一部を粗加
工する粗仕上部、６がクランクシャフト円筒部を最終仕
上げする仕上部となっている。As shown in FIGS. 1 and 2, the brooch 1 has a seat surface 2a concentric with the shaft center, a circumferential ridge 2b projecting in the center of the seat surface, and a total of five pieces orthogonal to the ridge 2b. A segment support shaft 2 having an axial key 2c, and segments 3, 4, 4'which are circumferentially divided into a plurality and are bolted to the outer periphery of the shaft 2,
5, 6 and a machining radial position adjusting mechanism 7 of the segment 6 provided between 2 and 6, and the whole is substantially disc-shaped. Reference numeral 8 denotes a fastening bolt, and each of the segments fixed by the bolt is positioned in the tool axial direction and the circumferential direction by fitting the ridge 2b and the key 2c into the grooves provided corresponding to these. . Also, these segments are 3
Is a leading part for cutting the rest groove in advance, 4'is a rough processing part for cutting the side surface of the counterweight, 5 is a rough finisher for roughly processing the outer periphery of the crankshaft cylindrical part and a part of the side surface of the counterweight, 6 Is the final finish for the crankshaft cylinder.
これ等のセグメントには、各セグメントに割り当てら
れた切削域を分担切削する切刃チップをステップ配置し
て取付けてあるが、この切刃チップは、セグメント本体
に直付けするものと位置調整可能に取付けるものゝ２種
類があるので区別のために前者を９、後者を10の符号で
示す。11は、仕上用セグメント６に設けた側端部切刃チ
ップ（第３図における上側の２個）の径方向及び幅方向
位置調整ユニット、12は中仕上用セグメント５の後尾に
設けたチップの径方向位置調整ユニット、13は先行用セ
グメント３に設けた後尾チップの径方向位置調整ユニッ
トであり、これ等については後に解説する。These segments are equipped with cutting edge tips that share the cutting area assigned to each segment in a step arrangement, and these cutting edge tips can be position-adjusted with those directly attached to the segment body. Since there are two types of attachments, the former is indicated by 9 and the latter is indicated by 10 for distinction. 11 is a radial and width direction position adjusting unit of the side end cutting blade tips (the upper two in FIG. 3) provided on the finishing segment 6, and 12 is a tip provided at the tail of the middle finishing segment 5. A radial position adjusting unit, 13 is a radial position adjusting unit of the rear tip provided in the preceding segment 3, which will be described later.
上記仕上用セグメント６の部分に設けた調整機構７
は、突条2b、キー2c、ボルト８を避けてセグメント本体
6aの内径溝面と支持軸２の外径平坦面との間に接線（６
の周方向中間部での接線）方向に配置したテーパ角が小
さくて横断面は四角いくさび7aと、このくさびを長手方
向にスライドさせるボルト7bと、支持軸２に固定したボ
ルトの反力受け7cとで構成されており、ボルト８を緩め
てボルト7bを操作すると、セグメント６の全体が径方向
微動して６の全切刃の加工径が調整される。Adjustment mechanism 7 provided on the finishing segment 6
Avoid the ridge 2b, key 2c, and bolt 8
A tangent line (6) is formed between the inner diameter groove surface of 6a and the outer diameter flat surface of the support shaft 2.
The taper angle is small and the transverse cross section is square wedge 7a, the bolt 7b that slides this wedge in the longitudinal direction, and the reaction force receiver 7c of the bolt fixed to the support shaft 2 When the bolt 8 is loosened and the bolt 7b is operated, the entire segment 6 is slightly moved in the radial direction, and the machining diameters of all the cutting edges 6 are adjusted.
また、仕上用セグメント６に設けた調整ユニット11
は、第６図に示すように、セグメント本体6aの側面の座
溝に挿入したロケータ（可動ブロック）11a、このロケ
ータ11aを座溝の側面に引きつけるねじ11b、ロケータ11
aの下端のテーパ面とセグメント本体6aとの間に挿入し
たくさび11c、そのくさびの圧入ねじ11d、ロケータ上端
側を側方に押す加工ねじ11eから成る。このユニット11
は、ねじ11eを締め込むと外側端の切刃チップ10を取付
けたロケータ11aが図のように傾き、クランクシャフト
円筒部側面の加工幅が変わる。このとき、ロケータ11a
は下端コーナ部を支点にして傾くため、加工幅の調整に
は加工径の変動が伴うが、これは、くさび11cの圧入量
調整で補正し得る。なお、ロケータ11aの横移動は本体6
aとの間にくさびを挿入して行なってもよいが、厚みの
薄い旋削ブローチにはスペース面で第６図の調整機構が
適している。但し、この機構を用いる場合には、ロケー
タ11aの傾きによって、そのロケータに取付けたチップ1
0のすくい面と逃げ面との交差稜が加工径よりも外側に
飛び出す恐れがあるので、これによる加工面粗さの悪化
を避けるため、外側端のチップはコーナアール部のみ又
はコーナアールとこれに続く微小長さのサラエ刃（第７
図のｌの部分）が有効刃となるものを選択する。14は６
に設けた他のチップの径方向調整機構であって、チップ
を支持したロケータ14aを、調整ねじで推進させるくさ
びによって半径方向に移動させる。また、ロケータ14a
の固定はねじに引込まれるくさび状の押え金15によって
行なわれる。In addition, the adjusting unit 11 provided in the finishing segment 6
As shown in FIG. 6, a locator (movable block) 11a inserted into a seat groove on the side surface of the segment body 6a, a screw 11b for attracting the locator 11a to the side surface of the seat groove, a locator 11
It comprises a wedge 11c inserted between the taper surface at the lower end of a and the segment body 6a, a press-fitting screw 11d for the wedge, and a processing screw 11e for pushing the upper end side of the locator laterally. This unit 11
When the screw 11e is tightened, the locator 11a to which the cutting edge tip 10 at the outer end is attached tilts as shown in the figure, and the machining width of the side surface of the crankshaft cylindrical portion changes. At this time, locator 11a
Since it tilts with the lower end corner as a fulcrum, the adjustment of the machining width involves a variation of the machining diameter, which can be corrected by adjusting the press-fitting amount of the wedge 11c. In addition, the horizontal movement of the locator 11a
A wedge may be inserted between a and this, but the adjusting mechanism shown in FIG. 6 is suitable for thin turning broaches in terms of space. However, when this mechanism is used, the tip 1 attached to the locator 11a is tilted due to the inclination of the locator 11a.
The cross edge of the rake face and flank face of 0 may jump out to the outside of the machined diameter. A very small length of Sarae blade (7th
Select the one where the effective blade is (1 in the figure). 14 is 6
Another radial adjustment mechanism for the tip provided in the above, the locator 14a supporting the tip is moved in the radial direction by a wedge propelled by an adjustment screw. Also, locator 14a
Is fixed by a wedge-shaped presser foot 15 drawn into the screw.
このほか、旋削ブローチによる加工では、第８図のよ
うに、工具の送りf1が一定していても、円筒部側面の加
工ではワーク半径方向の送りf2、f3がワーク中心から離
れるほど大きくなって外径側ほど加工面粗さが粗くなる
ので、面粗さの改善策として、第６図の形状のチップ10
は側面側の逃げ角度γを１゜30′〜２゜30′の範囲に収
めるのがよい。また、第７図のチップ10はｌを3mm以下
としてγ′を10′〜40′の範囲に収めるのがよい。In addition, in machining by turning broach, even if the tool feed f 1 is constant, as shown in Fig. 8, in machining the side surface of the cylindrical part, the feeds f 2 and f 3 in the workpiece radial direction become more distant from the center of the workpiece. The larger the outer diameter, the rougher the machined surface becomes. Therefore, as a measure to improve the surface roughness, the tip 10 having the shape shown in FIG.
It is advisable to set the side relief angle γ within the range of 1 ° 30 'to 2 ° 30'. Further, in the chip 10 of FIG. 7, it is preferable that γ'is within the range of 10'-40 'by setting l to 3 mm or less.
次に、中仕上用セグメント５の切刃チップは、数個を
１組として複数組設けると共に、最後尾の１組のチップ
は調整ユニット12のホルダブロック12aに取付けてあ
る。ホルダブロック12aは、中仕上用セグメント本体5a
の周方向後部に設けた座溝内にシム12bと周方向、加工
幅方向の各位置決めキー12c、12dを介して挿入され、セ
グメント本体5aにボルト12eで固定されている。従っ
て、シム12bの交換が可能であり、そのシムの厚みを変
えるとホルダブロック12aが加工径方向に変位して中仕
上げの加工径が変わる。このように、中仕上用セグメン
ト５に加工径の調整ユニット12を設けておくと、高精度
加工面でより一層有利になる。即ち、クランクシャフト
各部での加工径のバラツキの補正のために調整機構７で
仕上用セグメント６の加工径を調整すると、複数ブロー
チ間での仕上代が不均一になり、加工径の高精度維持が
難しくなる。しかし、調整ユニット12があれば仕上代を
効率良く均一化して上の不都合を解消し得る。Next, a plurality of cutting blade tips of the intermediate finishing segment 5 are provided, one set being several, and the last set of tips is attached to the holder block 12a of the adjusting unit 12. The holder block 12a is a segment main body 5a for medium finishing.
It is inserted into the seat groove provided at the rear portion in the circumferential direction through the shim 12b via the positioning keys 12c and 12d in the circumferential direction and the machining width direction, and is fixed to the segment body 5a with the bolt 12e. Therefore, the shim 12b can be replaced, and when the thickness of the shim is changed, the holder block 12a is displaced in the machining radial direction and the machining diameter for semi-finishing is changed. As described above, when the machining diameter adjusting unit 12 is provided in the medium finish segment 5, it becomes more advantageous in terms of high precision machining. That is, when the machining diameter of the finishing segment 6 is adjusted by the adjusting mechanism 7 in order to correct the variation of the machining diameter in each part of the crankshaft, the finishing allowance becomes uneven between a plurality of broaches and the machining diameter is maintained with high accuracy. Becomes difficult. However, if the adjustment unit 12 is provided, the finishing allowance can be efficiently equalized and the above inconvenience can be eliminated.
調整ユニット13は、先行用セグメント３が削るレスト
溝の深さ調整のために設けてある。即ち、図のブローチ
においては、先行用セグメントの切刃チップは、周方向
に位置ずれさせた３個をセグメント本体3aの幅方向中央
部に整列させて径方向に略均一段差がつくようにステッ
プ配置してあるが、クランクシャフト円筒部の幅方向中
央部を切る先行用セグメント３の加工径と中仕上用セグ
メント５の加工径が異なると仕上代を残した被加工円筒
部に段差が生じ、仕上用セグメントの各刃の切削負担量
が安定しない。そこで、先行用セグメントの最終刃の加
工径を中仕上用セグメントの最終刃加工径と一致させる
ために調整ユニット13を設けてある。この調整ユニット
13は、セグメント本体3a外周のポケットに径方向には移
動可能、幅方向には移動不可に係合させて前面側をねじ
に引込まれる押え金15でクランプしたロケータ13a、ロ
ケータ位置を変えるアジャストスクリュー13bで構成さ
れ、押え金15を緩めてスクリュー13bの回転操作でロケ
ータ11aと共に切刃チップ10を径方向に移動させるよう
になっている。The adjusting unit 13 is provided for adjusting the depth of the rest groove cut by the preceding segment 3. That is, in the broach shown in the drawing, the cutting edge tips of the preceding segment are aligned in the widthwise central portion of the segment main body 3a by aligning the three circumferentially offset cutting tips to form a substantially uniform step in the radial direction. Although arranged, if the machining diameter of the preceding segment 3 and the machining diameter of the medium-finishing segment 5 that cut the central portion in the width direction of the crankshaft cylindrical portion are different, a step is generated in the cylindrical portion to be machined leaving a finishing allowance, The cutting load on each blade of the finishing segment is not stable. Therefore, an adjusting unit 13 is provided in order to match the machining diameter of the final blade of the preceding segment with the machining diameter of the final blade of the medium finishing segment. This adjustment unit
13 is a locator 13a clamped by a presser foot 15 which is engaged with a pocket on the outer circumference of the segment main body 3a in a radial direction and is immovable in a width direction and the front side is pulled into a screw, and an adjuster for changing the locator position. The screw 13b is configured to loosen the presser foot 15 and rotate the screw 13b to move the cutting blade tip 10 in the radial direction together with the locator 11a.
なお、先行用セグメントに設ける切刃チップは、厚み
のあまりない本体3aに配置されるので、ロケータ13aで
支持するもの、本体3aに直付けするもの共、止めねじの
ねじ込み量を充分に確保し難い。そのため、第９図に示
すようなクランプ構造を採用してねじ孔加工部の厚み不
足を補ない、チップのクランプ強度を高めてある。即
ち、図のように、止めねじ16の挿入孔を加工してある側
面中央部に凹所9a（10a）を設け、この凹所9aに本体3a
又はロケータ13aに形成された突起状のチップ座を進入
させて切刃の有効長さを短くせずにチップ座に設けるね
じ孔の孔長さl1を増加させてある。Since the cutting blade tip provided in the preceding segment is arranged in the main body 3a having a small thickness, both the one supported by the locator 13a and the one directly attached to the main body 3a ensure a sufficient screwing amount of the set screw. hard. Therefore, a clamp structure as shown in FIG. 9 is adopted to increase the clamp strength of the tip without compensating for the insufficient thickness of the screw hole processed portion. That is, as shown in the figure, a recess 9a (10a) is provided in the center of the side surface where the insertion hole of the set screw 16 is machined, and the recess 9a is provided with a main body 3a.
Alternatively, the projecting tip seat formed on the locator 13a is inserted to increase the hole length l 1 of the screw hole provided in the tip seat without shortening the effective length of the cutting blade.
さらに、先行用セグメントの最後尾チップのみセグメ
ント本体の幅方向中央部に配置し、その他は中心から１
〜2mmずらして配置してある。これは、先行用セグメン
トのチップを全て中央に整列させると、最後尾のチップ
に近づくにつれて溝深さが深くなり、切屑がつまり易く
なるため、溝幅をチップ幅よりも広くして切屑づまりを
防止するためである。Furthermore, only the rearmost tip of the preceding segment is placed in the widthwise central part of the segment body, and the others are 1 from the center.
They are arranged with a shift of ~ 2mm. This is because when all the chips of the preceding segment are aligned in the center, the groove depth becomes deeper as it approaches the last chip, and chips are easily clogged.Therefore, make the groove width wider than the chip width to prevent chip clogging. This is because
以上のように、この発明の旋削ブローチは、周方向に
分割して取付けたセグメントのうち、最後尾の仕上用セ
グメントをセグメント支持部材との間に設けた調整機構
により径方向に一括して位置調整可能となしたものであ
るから、クランクシャフト円筒部の複数同時加工におい
て発生するクランクシャフトの変形量差、ブローチの熱
膨脹差に起因した円筒部各部での加工径のバラツキを効
率良く補正して高加工精度を確保できる。また、中仕上
用セグメントのクランクシャフト円筒部外周切削用切刃
の加工径方向調整機構を具備しているので、仕上用セグ
メントの加工径調整で生じる仕上代の変動を中仕上げ切
刃の加工径方向位置調整で吸収して複数ブローチ間での
仕上代を均一化することができ、仕上げ精度のバラツキ
が小さくなって加工精度がより一層向上すると云う効果
がある。As described above, in the turning broach of the present invention, among the segments which are divided and attached in the circumferential direction, the rearmost finishing segment is collectively positioned in the radial direction by the adjusting mechanism provided between the segment supporting member. Since it is adjustable, it is possible to efficiently correct the variation in the machining diameter at each part of the cylinder part due to the difference in the amount of crankshaft deformation and the difference in thermal expansion of the broach that occur during the simultaneous machining of multiple parts of the crankshaft cylinder. High processing accuracy can be secured. In addition, since it is equipped with a mechanism for adjusting the machining diameter of the cutting edge for cutting the outer circumference of the crankshaft cylindrical portion of the medium finishing segment, fluctuations in the finishing allowance caused by adjusting the machining diameter of the finishing segment can be used There is an effect that it can be absorbed by adjusting the directional position and the finishing allowance can be made uniform among a plurality of broaches, variation in finishing accuracy is reduced, and processing accuracy is further improved.
なお、仕上用セグメントに切刃の径方向及び幅方向位
置調整ユニットを付加したものは、加工幅の精度も高め
ることができる。It should be noted that the finishing segment added with the cutting blade radial direction and width direction position adjusting unit can improve the accuracy of the working width.
また、仕上用セグメントの側端の切刃を、セグメント
本体に組付けた径方向及び幅方向調整ユニットで支持し
たものは、加工幅の調整も行え、加工精度をより高め得
る。In addition, when the cutting edge at the side end of the finishing segment is supported by the radial direction and width direction adjusting unit assembled to the segment body, the working width can be adjusted, and the working accuracy can be further improved.
また、請求項の３、４に記載の構成を付加したもの
は、チップの側面部切刃によるサラエ作用によってクラ
ンクシャフト円筒部の側面、特にワークの外径側側面の
面粗さが改善されると言う効果がある。Further, in the structure to which the configurations described in claims 3 and 4 are added, the surface roughness of the side surface of the crankshaft cylindrical portion, particularly the outer diameter side surface of the work is improved by the Sarae action of the side surface cutting edge of the tip. Is effective.
さらに、請求項５に記載の構成を付加したものは仕上
刃の切削分担量の均一化とチップクランプの安定化が計
れ、工具の信頼性、加工精度の更なる向上に寄与できる
と言う効果がある。Further, the structure to which the structure according to claim 5 is added has an effect that the amount of cutting sharing of the finishing blade can be made uniform and the tip clamp can be stabilized, which can contribute to further improvement of the reliability and machining accuracy of the tool. is there.
第１図は、この発明の一実施例を示す側面図、第２図は
使用状態を簡略化して示す断面図、第３図は仕上用セグ
メントの外径面側を展開して示す図、第４図は中仕上用
セグメントの後尾外径面側の展開図、第５図は先行用セ
グメントの後尾外径面側の展開図、第６図は仕上用セグ
メントに設けた調整ユニットの断面図、第７図は仕上用
セグメントの外側端切刃チップの一例を示す正面図、第
８図はワーク半径方向送りの変化状態についての説明
図、第９図は先行用セグメントに採用したチップクラン
プ機構の断面図である。 １……旋削ブローチ、２……セグメント支持軸、 ３……先行セグメント、 ４、４′……粗加工用セグメント、 ５……中仕上用セグメント、 ６……仕上用セグメント、 ７……径方向位置調整機構、 ８……ボルト、９、10……切刃チップ、 11……径方向及び幅方向位置調整ユニット、 12、13、14……径方向位置調整ユニット、 15……押え金、16……止めねじ。FIG. 1 is a side view showing an embodiment of the present invention, FIG. 2 is a cross-sectional view showing a simplified use condition, and FIG. 3 is a view showing an outer diameter surface side of a finishing segment in a developed manner. FIG. 4 is a development view of the rear outer diameter surface side of the middle finishing segment, FIG. 5 is a development view of the rear outer diameter surface side of the preceding segment, and FIG. 6 is a cross-sectional view of an adjusting unit provided in the finishing segment. FIG. 7 is a front view showing an example of the outer edge cutting blade tip of the finishing segment, FIG. 8 is an explanatory view of a change state of the work radial feed, and FIG. 9 is a tip clamping mechanism adopted for the preceding segment. FIG. 1 ... Turning broach, 2 ... Segment support shaft, 3 ... Leading segment, 4, 4 '... Roughing segment, 5 ... Medium finishing segment, 6 ... Finishing segment, 7 ... Radial direction Position adjustment mechanism, 8 ... Bolt, 9, 10 ... Cutting edge tip, 11 ... Radial and width direction adjustment unit, 12, 13, 14 ... Radial position adjustment unit, 15 ... Presser foot, 16 ...... Set screw.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 松下 豊 愛知県豊田市トヨタ町１番地 トヨタ自 動車株式会社内 (72)発明者 山本 修三 愛知県豊田市トヨタ町１番地 トヨタ自 動車株式会社内 (72)発明者 星野 幸雄 愛知県刈谷市朝日町１丁目１番地 豊田 工械株式会社内 (72)発明者 山根 克敏 兵庫県伊丹市昆陽北１丁目１番１号 住 友電気工業株式会社伊丹製作所内 (56)参考文献 特開 昭63−105810（ＪＰ，Ａ) 特開 昭64−71615（ＪＰ，Ａ) 米国特許4382731（ＵＳ，Ａ) ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yutaka Matsushita 1 Toyota Town, Toyota City, Aichi Prefecture, Toyota Motor Corporation (72) Inventor Shuzo Yamamoto 1 Toyota Town, Toyota City, Aichi Prefecture, Toyota Motor Corporation ( 72) Inventor Yukio Hoshino 1-1 Asahi-cho, Kariya City, Aichi Toyota Machinery Co., Ltd. (72) Inventor Katsutoshi Yamane 1-1-1 Kunyo Kita, Itami City, Hyogo Sumitomo Electric Industries Itami Works (56) References JP-A-63-105810 (JP, A) JP-A-64-71615 (JP, A) US Pat. No. 4,382,731 (US, A)
Claims (5)
工具であって、その全体が略円板状をなし、かつ、円周
上に座面を有するセグメント支持部材とこの支持部材の
座面上に位置決めして着脱自在に取付ける周方向に複数
分割されたセグメントから成り、各々が分割刃を構成す
る切刃チップを備えた上記セグメントの中にクランクシ
ャフト円筒部を仕上げる仕上用セグメントと、仕上用セ
グメントに先行してクランクシャフト円筒部の外周を加
工する中仕上用セグメントが含まれ、前記仕上用セグメ
ントとセグメント支持部材との間に仕上用セグメント全
体を径方向に位置調整する加工径方向位置調整機構を具
備し、また、前記中仕上用セグメントはクランクシャフ
ト円筒部の外周を削る切刃チップの加工径方向位置調整
機構を具備していることを特徴とする旋削ブローチ。1. A broaching tool for cutting a cylindrical portion of a crankshaft, the whole of which has a substantially disc shape, and a segment supporting member having a seating surface on the circumference, and a seating surface of the supporting member. A finishing segment for finishing the crankshaft cylinder in the segment that has a plurality of circumferentially divided segments that are positioned and removably attached, and each of which has a cutting edge tip that constitutes a divided blade, and a finishing segment And a finishing radial segment for machining the outer circumference of the crankshaft cylindrical portion, and a machining radial position adjusting mechanism for radial positioning of the finishing segment between the finishing segment and the segment support member. Further, the intermediate finishing segment is provided with a machining radial position adjusting mechanism of a cutting edge tip for cutting the outer periphery of the crankshaft cylindrical portion. Turning brooch, characterized in that.
刃の径方向及び幅方向位置調整ユニットを設け、仕上用
セグメントの側端部に設ける切刃チップをそのユニット
に取付けてある請求項１に記載の旋削ブローチ。2. A radial and widthwise position adjusting unit for a cutting blade to be assembled to the main body of the finishing segment is provided, and a cutting blade tip provided at a side end portion of the finishing segment is attached to the unit. Turning brooch described in.
コーナアールのみが有効刃となる刃形にし、かつ、工具
軸と直角面に対して側面側に１゜30′〜２゜30′の逃げ
角を付した請求項１又は２記載の旋削ブローチ。3. The cutting edge tip at the side end of the finishing segment comprises:
The turning broach according to claim 1 or 2, wherein only the corner is an effective blade, and a clearance angle of 1 ° 30 'to 2 ° 30' is provided on the side surface with respect to the plane perpendicular to the tool axis.
コーナアールとこれに続くサラエ刃が有効刃となる刃形
にし、かつ、サラエ刃長さを3mm以下にしてそのサラエ
刃に工具軸と直角面とのなす角が10′〜40′の傾きをつ
けた請求項１又は２記載の旋削ブローチ。4. The cutting edge tip at the side end of the finishing segment comprises:
The corner and the subsequent Sarae blade are made to be effective blades, and the Sarae blade length is set to 3 mm or less, and the angle between the tool axis and the right angle surface is 10 'to 40'. The turning broach according to claim 1, which is attached.
メントの切刃チップは、先行用セグメントの最後尾チッ
プのみを幅方向中央部に、その他は千鳥に中心から１〜
2mmずらして配置すると共に径方向に略均一にステップ
配置し、さらに、送り方向後尾のチップはセグメント本
体に組付けた径方向位置調整ユニットに取付け、なおか
つ、チップ座にねじ止めする各切刃チップは、止めねじ
挿入孔を設けた側面中央部を加工幅方向に凹ませて、こ
の凹部に上記チップ座を進入させた請求項１乃至４のい
ずれかに記載の旋削ブローチ。5. The cutting edge tip of the preceding segment included in the above segment has only the rearmost tip of the preceding segment in the widthwise central portion, and the others in a zigzag from the center.
Displaced by 2 mm and stepped almost uniformly in the radial direction.In addition, each tip in the feed direction is attached to the radial position adjustment unit assembled in the segment body, and each cutting edge tip is screwed to the tip seat. The turning broach according to any one of claims 1 to 4, wherein the center portion of the side surface provided with the setscrew insertion hole is recessed in the machining width direction, and the tip seat is inserted into this recess.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1064094A JP2551651B2 (en) | 1989-03-16 | 1989-03-16 | Turning brooch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1064094A JP2551651B2 (en) | 1989-03-16 | 1989-03-16 | Turning brooch |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02243216A JPH02243216A (en) | 1990-09-27 |
| JP2551651B2 true JP2551651B2 (en) | 1996-11-06 |
Family
ID=13248145
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1064094A Expired - Fee Related JP2551651B2 (en) | 1989-03-16 | 1989-03-16 | Turning brooch |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2551651B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2871730B2 (en) * | 1989-07-03 | 1999-03-17 | ヴイデイア・ハインライン・ゲゼルシヤフト・ミツト・ベシユレンクテル・ハフツング | Rotating brooch |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4382731A (en) | 1981-08-29 | 1983-05-10 | Rigdon Russell L | Rotary machining apparatus |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3689694D1 (en) * | 1986-10-21 | 1994-04-07 | Hegenscheidt Gmbh Wilhelm | Rotary broaching tool. |
-
1989
- 1989-03-16 JP JP1064094A patent/JP2551651B2/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4382731A (en) | 1981-08-29 | 1983-05-10 | Rigdon Russell L | Rotary machining apparatus |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH02243216A (en) | 1990-09-27 |
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