JP2005319553A - Centering and machining method of workpiece - Google Patents

Centering and machining method of workpiece Download PDF

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JP2005319553A
JP2005319553A JP2004140625A JP2004140625A JP2005319553A JP 2005319553 A JP2005319553 A JP 2005319553A JP 2004140625 A JP2004140625 A JP 2004140625A JP 2004140625 A JP2004140625 A JP 2004140625A JP 2005319553 A JP2005319553 A JP 2005319553A
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workpiece
centering
machining
spindle
centering jig
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Isamu Matsudaira
勇 松平
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Sumitomo Electric Sintered Alloy Ltd
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Sumitomo Electric Sintered Alloy Ltd
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<P>PROBLEM TO BE SOLVED: To provide a centering and machining method of a workpiece, in which centering is carried out with reference to a bore of a workpiece simultaneously with machining of the bore, correction of inevitable relative displacement between a table of a machining device and a main shaft in order to ensure machining accuracy is not required, and the dimensional accuracy of each workpiece can be stabilized by carrying out a machining procedure each time under almost constant conditions without positional corrections. <P>SOLUTION: According to the centering and machining method, a centering jig 1 equipped with a centering member 3 having a taper cone 3a is mounted on the main shaft 5 of the machining device, and the centering jig 1 is fitted into the bore of the workpiece 10 to position the workpiece 10 to the center of the main shaft with reference to the main shaft 5, followed by clamping the workpiece 10 and fixing the same to a work holder 6 while the centering jig 1 is left as it is. Thereafter a tool is mounted on the main shaft 5 in place of the centering jig 1, and then the bore of the workpiece and an area with reference to the bore are machined. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

この発明は、軸穴を有する焼結部品などを精度よく加工することを可能ならしめるワークの芯出し加工方法に関する。   The present invention relates to a method for centering a workpiece that makes it possible to accurately process a sintered part having a shaft hole.

例えば、焼結スプロケットホイールは、仕上げとして中心の軸穴(内径穴)や周辺の小穴などを機械加工し、その処理を終えたものを製品として出荷している。図3に、焼結スプロケットホイールの一例を示す。例示の焼結スプロケットホイールについては、内径穴11と、その内径穴11の中心が位置基準になる周囲の小穴12、13とキー溝14の加工がなされる。   For example, sintered sprocket wheels are manufactured by machining a central shaft hole (inner diameter hole) or a peripheral small hole as a finish, and shipping the processed product as a product. FIG. 3 shows an example of a sintered sprocket wheel. In the illustrated sintered sprocket wheel, the inner diameter hole 11, the peripheral small holes 12 and 13 and the key groove 14 whose center is the center of the inner diameter hole 11 are processed.

機械加工は、量産品についてはマシニングセンタを使用し、焼結スプロケットホイールなどのワーク10を図4に示すようにテーブル側に設けた内径チャックCで保持し、内径面基準で芯出しを行って目的部位の加工を行っている。   For machining, a machining center is used for mass-produced products, and a workpiece 10 such as a sintered sprocket wheel is held by an inner diameter chuck C provided on the table side as shown in FIG. The part is being processed.

なお、ワークがボス部などを有し、外側から把持可能である場合には外径チャックでボス部などを把持して目的部位を加工することもある。   When the workpiece has a boss portion and can be gripped from the outside, the target portion may be processed by gripping the boss portion with an outer diameter chuck.

ワークを外径チャックで掴むと位置決めが外径基準でなされ、そのために、内、外径の同軸度が良くないワークは、加工部位の内径基準での位置精度が悪くなる。そこで、加工部位の内径基準での位置精度が要求されるときには、ワークを内径チャックで保持して加工する方法が採られるが、内径チャックを使用すると内径穴を加工するときにワークを掴み替えなければならず、生産性の低下と加工コスト上昇の問題が起こる。   When the workpiece is gripped by the outer diameter chuck, positioning is performed on the basis of the outer diameter. For this reason, a workpiece whose inner and outer diameters are not concentric is poor in positional accuracy on the basis of the inner diameter of the processing site. Therefore, when the position accuracy on the inner diameter reference of the processing part is required, a method of holding the workpiece with the inner diameter chuck is used. However, if the inner diameter chuck is used, the workpiece must be grasped when machining the inner diameter hole. In other words, there arises a problem of a decrease in productivity and an increase in processing cost.

また、マシニングセンタなどを使用して行う機械加工では、加工条件の経時変動が起こる。温度変化の影響やワークホルダの位置決め精度の影響などで主軸とテーブルとの間にずれが生じ、そのために加工ピッチが変動する。   Further, in machining performed using a machining center or the like, machining conditions change over time. A deviation occurs between the spindle and the table due to the influence of temperature change or the positioning accuracy of the work holder, and the machining pitch fluctuates accordingly.

これによる精度低下の問題を無くすために、従来は、加工済のワークを抜き取り検査して加工ピッチの変動状況を確認し、補正が必要と判断したときに主軸とテーブルの相対位置を補正する作業を1日に数回実施している。   In order to eliminate the problem of accuracy degradation due to this, conventionally, the processed workpiece is sampled and checked to check the fluctuation status of the machining pitch, and when it is judged that correction is necessary, the relative position between the spindle and the table is corrected. Is carried out several times a day.

しかしながら、この方法は、抜き取り検査や位置の補正に時間と手間を費やす。また、補正を行うまでの間にずれが蓄積していくので、製品の寸法精度のばらつき(許容値内でのばらつき)も大きくなる。   However, this method takes time and labor for sampling inspection and position correction. Further, since deviations are accumulated until correction is performed, variation in dimensional accuracy of the product (variation within an allowable value) also increases.

ここで、下記特許文献1は、旋回テーブル上にパレットを設置し、そのパレットの位置制御を直動アクチュエータで行ってパレット上のワークの位置を変化させる位置決めクランプ装置を開示している。この特許文献1の位置決めクランプ装置やこれと類似の機能を持つワークホルダを使用すれば補正作業を自動化することができるが、1日に数回の抜き取り検査による補正では、補正を行うまでの間のずれの蓄積による影響がでる。また、特許文献1が示しているような位置決めクランプ装置は高価であるので、経済負担も増す。
特開平08−057736号公報
Here, the following Patent Document 1 discloses a positioning clamp device in which a pallet is installed on a turning table, and the position of the pallet is controlled by a linear actuator to change the position of the workpiece on the pallet. If the positioning clamp device of this patent document 1 or a work holder having a function similar to this is used, the correction work can be automated, but in the correction by sampling inspection several times a day, the correction work is performed. It is affected by the accumulation of deviations. Moreover, since the positioning clamp apparatus as shown in Patent Document 1 is expensive, the economic burden increases.
Japanese Patent Application Laid-Open No. 08-057536

この発明は、熱変位などに対応するために従来実施している位置補正を不要となし、また、各回の加工条件をほぼ一定させてワークの寸法精度を安定させ、さらに、経済負担の増加や内径加工の規制なども無くすることを課題としている。   The present invention eliminates the need for conventional position correction to cope with thermal displacement, etc., stabilizes the dimensional accuracy of the workpiece by making the machining conditions almost constant, and increases the economic burden. The goal is to eliminate restrictions on internal diameter machining.

上記の課題を解決するため、この発明においては、先細テーパの外周面を有する芯出し治具を加工機の主軸に装着する過程、
加工機の主軸に装着したその芯出し治具をワークの内径穴に嵌合させてワークを主軸基準で主軸中心に位置決めする過程、
位置決めしたワークを芯出し治具を残したままクランプしてワークホルダに固定する過程、
前記芯出し治具と取り換えて加工機の主軸に工具を装着し、この工具でワークの内径穴又は内径穴が位置基準となる部位を加工する過程を経るワークの芯出し加工方法を提供する。
In order to solve the above problems, in the present invention, a process of mounting a centering jig having a tapered taper outer peripheral surface to the main spindle of the processing machine,
The process of positioning the workpiece centered on the spindle with reference to the spindle by fitting the centering jig attached to the spindle of the processing machine into the bore of the workpiece,
Clamping the positioned workpiece with the centering jig remaining and fixing it to the workpiece holder,
Provided is a workpiece centering method in which a tool is mounted on the spindle of a processing machine in place of the centering jig, and the inner diameter hole of the workpiece or a portion where the inner diameter hole serves as a position reference is processed with this tool.

この方法では、芯出し治具を弾性体で付勢し、前記先細テーパの外周面をワークの内径穴の入口部に弾性的に押し当てて嵌合させると好ましい。   In this method, it is preferable that the centering jig is urged by an elastic body, and the outer peripheral surface of the taper taper is elastically pressed against the inlet portion of the inner diameter hole of the workpiece to be fitted.

また、ワークホルダに設けた座面上にワークを載せ、前記芯出し治具で芯出しして位置決めした後、前記座面とこれに対向したワーク押さえとでワークを挟みつけて固定する方法や、座面によるワークの支持を局部支持とし、ワークホルダに設けた周壁でワークの外周を囲み、この状態で芯出し治具によるワークの芯出しを行うと方法を採るとより好ましい。   Also, after placing the workpiece on the seating surface provided in the workpiece holder, centering and positioning with the centering jig, the workpiece is sandwiched and fixed between the seating surface and the workpiece presser opposed thereto, It is more preferable to adopt a method in which the support of the work by the seating surface is a local support, the outer periphery of the work is surrounded by a peripheral wall provided on the work holder, and the work is centered by a centering jig in this state.

この発明の方法によれば、ワークの内径穴が主軸中心に位置決めされて加工が内径穴基準でなされるので、加工部位の内径基準での位置精度が高まる。また、ワークの位置決めが各ワークについてなされるので、加工機のテーブル上に設けるワークホルダと主軸の相対位置にずれが生じてもその影響がでず、加工条件が一定して製品の寸法、品質のばらつきが小さく抑えられる。   According to the method of the present invention, since the inner diameter hole of the workpiece is positioned at the center of the spindle and the machining is performed on the basis of the inner diameter hole, the positional accuracy on the basis of the inner diameter of the processed part is increased. In addition, since the workpiece is positioned for each workpiece, even if there is a deviation in the relative position between the workpiece holder and the spindle provided on the table of the processing machine, it will not be affected, and the machining conditions will be constant and the dimensions and quality of the product will be fixed. The variation of the is suppressed small.

さらに、この発明の方法では、ワークをクランプする前に芯出しするので、安価な芯出し治具で芯出しを行える。また、位置決め後に芯出し治具を工具と交換して加工を行うので、ワークを掴み替えずに内径穴を加工することも可能になる。   Furthermore, according to the method of the present invention, since the workpiece is centered before clamping, the centering can be performed with an inexpensive centering jig. In addition, since the centering jig is replaced with a tool after the positioning, the inner diameter hole can be processed without gripping the workpiece.

以下、この発明の実施の形態を添付図面の図1及び図2に基づいて説明する。図1は、この発明で使用する芯出し治具の一例を示している。この芯出し治具1は、加工機(マシニングセンタ)の主軸に差し込む取り付け部2と、その取り付け部2で軸方向スライド自在に保持した芯出し部材3と、この芯出し部材3を取り付け部2から芯出し部材3を押し出す向きに付勢するスプリング4とで構成されている。
ここでは、スプリングを用いたが、付勢手段は、ゴム、エアー等の流体ダンパ、エアー等の流体シリンダ等であってもよい。
Embodiments of the present invention will be described below with reference to FIGS. 1 and 2 of the accompanying drawings. FIG. 1 shows an example of a centering jig used in the present invention. The centering jig 1 includes an attachment portion 2 to be inserted into a main shaft of a processing machine (machining center), a centering member 3 held by the attachment portion 2 so as to be slidable in the axial direction, and the centering member 3 from the attachment portion 2. The spring 4 is configured to urge the centering member 3 in the pushing direction.
Although a spring is used here, the biasing means may be a fluid damper such as rubber or air, a fluid cylinder such as air, or the like.

芯出し部材3は、軸心と同心のテーパ面を外周に設けた先細りのテーパコーン3aを前部に有している。   The centering member 3 has a tapered taper cone 3a having a tapered surface concentric with the shaft at the outer periphery at the front.

この芯出し治具1を使用して行うワークの芯出しと加工の方法を以下に具体的に述べる。   A method for centering and processing a workpiece using the centering jig 1 will be specifically described below.

図2に示すように、芯出し治具1を加工機の主軸5に装着する。また、加工機のテーブル(図示せず)上にワークホルダ6を設け、このワークホルダ6上に加工するワーク10を載せる。   As shown in FIG. 2, the centering jig 1 is mounted on the spindle 5 of the processing machine. A work holder 6 is provided on a table (not shown) of the processing machine, and a work 10 to be processed is placed on the work holder 6.

ワークホルダ6は、ワーク10の一面を下から受け支える座面7と、ワーク10の外周を囲う周壁8と、座面7に対向して座面7との間にワーク10を挟み付けるワーク押さえ9とを備えている。ワーク押さえ9は、クランプ、アンクランプ用の駆動手段(図示せず)を有しており、その駆動手段に駆動されて動く。   The work holder 6 holds a workpiece 10 between the seating surface 7 that receives and supports one surface of the workpiece 10 from below, a peripheral wall 8 that surrounds the outer periphery of the workpiece 10, and the seating surface 7 facing the seating surface 7. 9 and. The work presser 9 has driving means (not shown) for clamping and unclamping, and is moved by being driven by the driving means.

ワークホルダ6の座面7上にワーク10を載せたら、加工機の主軸5を下降させる。その動作で主軸5に装着した芯出し治具1のテーパコーン3aが図2に鎖線で示すようにワーク10の内径穴に挿入され、テーパコーン3aがワーク10の内径穴の入口の縁に押し当てられてテーパ面の作用でワーク10が主軸5の軸心を基準にした位置に位置決めされる。   When the workpiece 10 is placed on the seating surface 7 of the workpiece holder 6, the spindle 5 of the processing machine is lowered. As a result, the taper cone 3a of the centering jig 1 attached to the spindle 5 is inserted into the inner diameter hole of the workpiece 10 as shown by a chain line in FIG. Thus, the workpiece 10 is positioned at a position based on the axis of the main shaft 5 by the action of the tapered surface.

この後、スプリング4が圧縮され、芯出し部材3と取り付け部2の相対移動量が規定値に到達するなどして図示しないスイッチが作動し、ワーク押さえ9によるワーク10のクランプがなされてワーク10がワークホルダ6に固定される。
ここで、テーパコーン3aを主軸5によりワーク10の内径穴とテーパコーン3aに摺動摩耗が生じない程度の極低速で回転させつつ、ワーク10の位置決めをしてもよい。
Thereafter, the spring 4 is compressed, a switch (not shown) is actuated, for example, when the relative movement amount of the centering member 3 and the mounting portion 2 reaches a specified value, and the workpiece 10 is clamped by the workpiece presser 9. Is fixed to the work holder 6.
Here, the workpiece 10 may be positioned while the taper cone 3a is rotated by the spindle 5 at an extremely low speed that does not cause sliding wear on the inner diameter hole of the workpiece 10 and the taper cone 3a.

そこで、主軸5を一旦上昇させ、この主軸5に装着している芯出し治具1を工具と取り換えて主軸に取り付けた工具でワークを加工する。その加工は、内径穴や内径穴の周囲の小穴などについて行われ、工具は加工内容に応じたものが取り換えて使用される。   Therefore, the spindle 5 is once raised, the centering jig 1 mounted on the spindle 5 is replaced with a tool, and the workpiece is processed with a tool attached to the spindle. The machining is performed on an inner diameter hole or a small hole around the inner diameter hole, and a tool corresponding to the machining content is replaced and used.

加工を終了すると、ワーク押さえ9をアンクランプにしてワーク10を取り外し、新たなワークをセットして上記の動作を繰り返す。   When the machining is completed, the workpiece holder 9 is unclamped, the workpiece 10 is removed, a new workpiece is set, and the above operation is repeated.

この方法によれば、ワークを1つ加工する度に芯出し治具1を主軸5に着け外しする必要があるが、最近のマシニングセンタは、工具交換を1秒にも満たない時間で行えるものが出現しており、生産性には殆ど影響がでない。   According to this method, it is necessary to attach and detach the centering jig 1 to and from the spindle 5 every time one workpiece is machined. However, recent machining centers can perform tool change in less than 1 second. Has emerged and has little impact on productivity.

また、この方法では全てのワークを主軸基準で位置決めするのでテーブルと主軸の相対変位が起こっても加工精度には影響がでない。例えば、図3の焼結スプロケットホイールについては、内径穴11の中心から小穴12の中心までのピッチPについて、内径チャック方式とこの発明の方法によるチャック方式は、同等以上の精度を得ることが可能になった。   Further, in this method, since all the workpieces are positioned on the basis of the spindle, the machining accuracy is not affected even if a relative displacement between the table and the spindle occurs. For example, with respect to the sintered sprocket wheel of FIG. 3, the inner diameter chuck method and the chuck method according to the method of the present invention can obtain the same or better accuracy for the pitch P from the center of the inner diameter hole 11 to the center of the small hole 12. Became.

なお、ワークホルダの座面7は、図2に示すように部分的に隆起した面にするとワークの支持面積が小さく、ワークが芯出し時に滑り易くなって芯出しがスムーズになされる。また、座面7の面積を狭くすると、ワークの端面に生じたバリが座面7上にのり上げてワークの保持姿勢が崩れると云う不具合も発生し難い。   If the seat surface 7 of the work holder is a partially raised surface as shown in FIG. 2, the support area of the work is small, and the work is easily slipped when centering, so that the centering is smoothly performed. Further, when the area of the seat surface 7 is reduced, it is difficult to cause a problem that a burr generated on the end surface of the workpiece rises on the seat surface 7 and the workpiece holding posture is lost.

この発明の方法で使用する芯出し治具の一例を示す断面図Sectional drawing which shows an example of the centering jig used with the method of this invention この発明の方法での芯出し状態を示す断面図Sectional drawing which shows the centering state by the method of this invention ワークの一例を示す断面図Sectional view showing an example of a workpiece 内径チャックでワークを保持した状態の断面図Sectional view of workpiece held by inner diameter chuck

符号の説明Explanation of symbols

1 芯出し治具
2 取り付け部
3 芯出し部材
3a テーパコーン
4 スプリング
5 主軸
6 ワークホルダ
7 座面
8 周壁
9 ワーク押さえ
10 ワーク
11 内径穴
12、13 小穴
14 キー溝
DESCRIPTION OF SYMBOLS 1 Centering jig 2 Mounting part 3 Centering member 3a Taper cone 4 Spring 5 Spindle 6 Work holder 7 Seat surface 8 Peripheral wall 9 Work holding 10 Work 11 Inner diameter hole 12, 13 Small hole 14 Keyway

Claims (4)

先細テーパの外周面を有する芯出し治具を加工機の主軸に装着する過程、
加工機の主軸に装着したその芯出し治具をワークの内径穴に嵌合させてワークを主軸基準で主軸中心に位置決めする過程、
位置決めしたワークを芯出し治具を残したままクランプしてワークホルダに固定する過程、
前記芯出し治具と取り換えて加工機の主軸に工具を装着し、この工具でワークの内径穴又はその内径穴が位置基準となる部位を加工する過程を経るワークの芯出し加工方法。
A process of mounting a centering jig having a tapered taper outer peripheral surface to the spindle of the processing machine,
The process of positioning the workpiece centered on the spindle with reference to the spindle by fitting the centering jig attached to the spindle of the processing machine into the bore of the workpiece,
Clamping the positioned workpiece with the centering jig remaining and fixing it to the workpiece holder,
A work centering method in which a tool is mounted on a spindle of a processing machine in place of the centering jig, and the inner diameter hole of the work or a portion where the inner diameter hole serves as a position reference is processed with this tool.
前記芯出し治具を弾性体で付勢し、前記先細テーパの外周面をワークの内径穴の入口部に弾性的に押し当てて嵌合させる請求項1に記載のワークの芯出し加工方法。   The work centering method according to claim 1, wherein the centering jig is urged by an elastic body, and the outer peripheral surface of the tapered taper is elastically pressed and fitted to an inlet portion of an inner diameter hole of the work. ワークホルダに設けた座面上にワークを載せ、前記芯出し治具で芯出しして位置決めした後、前記座面とこれに対向したワーク押さえとでワークを挟みつけて固定する請求項1又は2に記載のワークの芯出し加工方法。   The workpiece is placed on a seating surface provided in a workpiece holder, centered by the centering jig and positioned, and then the workpiece is sandwiched and fixed by the seating surface and a workpiece presser opposed thereto. 2. The work centering method according to 2 above. 前記座面によるワークの支持を局部支持とし、さらに、ワークホルダに設けた周壁でワークの外周を囲み、この状態で芯出し治具によるワークの芯出しを行う請求項1乃至3のいずれかに記載のワークの芯出し加工方法。   The support of the workpiece by the seating surface is a local support, and the outer periphery of the workpiece is surrounded by a peripheral wall provided on the workpiece holder, and the workpiece is centered by a centering jig in this state. The workpiece centering method described.
JP2004140625A 2004-05-11 2004-05-11 Centering and machining method of workpiece Pending JP2005319553A (en)

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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100881784B1 (en) 2007-10-12 2009-02-03 두원중공업(주) An apparatus for center setting
CN102357825A (en) * 2011-09-07 2012-02-22 池州市邦鼐机电科技有限公司 Clamping device for processing slender axle top hole
CN102615559A (en) * 2012-04-19 2012-08-01 天津第一机床总厂 Fine machining device and machining method of excircle of big tapered-hole spindle of large gear milling machine
CN103111880A (en) * 2013-02-21 2013-05-22 上海电气电站设备有限公司 Clamping and supporting device used for adjusting guide sleeve processing
CN104209898A (en) * 2014-08-11 2014-12-17 珠海格力电器股份有限公司 Shaft deviation-prevention tool for motor of wall penetrating machine of air conditioner
JP2017193019A (en) * 2016-04-21 2017-10-26 実 金松 Tool holder with center and processing method
KR102132272B1 (en) * 2019-03-11 2020-07-09 (주)신스윈 Zig for oldhamring
WO2021131362A1 (en) * 2019-12-24 2021-07-01 株式会社トクヤマデンタル Processing block, holder for processing block, and method of positioning processing block

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100881784B1 (en) 2007-10-12 2009-02-03 두원중공업(주) An apparatus for center setting
CN102357825A (en) * 2011-09-07 2012-02-22 池州市邦鼐机电科技有限公司 Clamping device for processing slender axle top hole
CN102615559A (en) * 2012-04-19 2012-08-01 天津第一机床总厂 Fine machining device and machining method of excircle of big tapered-hole spindle of large gear milling machine
CN103111880A (en) * 2013-02-21 2013-05-22 上海电气电站设备有限公司 Clamping and supporting device used for adjusting guide sleeve processing
CN104209898A (en) * 2014-08-11 2014-12-17 珠海格力电器股份有限公司 Shaft deviation-prevention tool for motor of wall penetrating machine of air conditioner
JP2017193019A (en) * 2016-04-21 2017-10-26 実 金松 Tool holder with center and processing method
KR102132272B1 (en) * 2019-03-11 2020-07-09 (주)신스윈 Zig for oldhamring
WO2021131362A1 (en) * 2019-12-24 2021-07-01 株式会社トクヤマデンタル Processing block, holder for processing block, and method of positioning processing block

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