JPS6248449A - Method of automatically correcting boring diameter - Google Patents

Abstract

PURPOSE:To omit a constitutional equipment and reduce a price, by obtaining the number of revolutions of main spindle necessary for correction from a correction cut quantity and rotating a main spindle only for a time corresponding to the number of revolutions of main spindle so as to eliminate the necessity for a rotary speed detector and prevent a decrease of reliability and misoperation. CONSTITUTION:The number of revolutions main spindle necessary for correction of a correction cut quantity, obtained by an actually measured result after the preceding machining, is obtained by dividing the corrected quantity by a correction quantity per one revolution. And a time necessary for correction is obtained by further dividing the corrected revolutional quantity by a revolution quantity per one second of a main spindle 1. Here the main spindle, being started and rotated only for a time necessary for correction, is stopped after a necessary time by counting the time, finishing the correction. Accordingly, the necessity for a detector like a proximity switch for detecting a rotary speed of the main spindle is eliminated. As a result, a decrease of reliability due to the detector and misoperation can be prevented, while the price of a device can be reduced by enabling an electric system constitutional equipment relating to the detection of number of revolutions to be eliminated.

Description

【発明の詳細な説明】 ［産業上の利用分野］ 本発明は高い精度を要求されるボーリング加工作業に於
ける自動ボーリング径補正方法に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to an automatic boring diameter correction method in boring operations that require high accuracy.

［従来の技術］ ボーリング加工（孔内面仕上）を行う場合、工具の撓み
或は熱変形等の理由により工具の設定径どおりには仕上
げられない。従って最終仕上げ加工前に仕上げ寸法、よ
り０．３ＩｌｌＩｌ程度小さい径で切削加工する。その
後加工寸法を実測し、その実測結果に基づき最終切込み
量を決定し仕上げ加工を行っている。[Prior Art] When boring (finishing the inner surface of a hole), it is not possible to finish the hole according to the set diameter of the tool due to bending or thermal deformation of the tool. Therefore, before the final finishing process, cutting is performed to a diameter that is approximately 0.3IllIl smaller than the final dimension. After that, the machining dimensions are actually measured, the final depth of cut is determined based on the actual measurement results, and finishing machining is performed.

現在ＮＯ加工機の普及に伴ない最終切込み量の補正を自
動化している。斯かる切込量補正装置の１例として第１
図に示すものがある。Currently, with the spread of NO processing machines, the correction of the final depth of cut is being automated. As an example of such a depth of cut correction device, the first
There is one shown in the figure.

図中１は主軸を示し、該主軸１に切込量補正ユニット２
が取付られている。1 in the figure indicates the main shaft, and the cutting amount correction unit 2 is attached to the main shaft 1.
is installed.

主軸１と共に回転する主体３にはスライダ４が半径方向
に摺動可能に設けられ該スライダ４にバイト５が固着さ
れた支持体６が取付られている。前記主体３にはスクリ
ューロッド７が半径方向に回転自在に設けられ、スクリ
ューロッド７には主体の先端側端面をテーバせしめたナ
ツトブロック８が螺合されている。又、伝達体９は前記
ナツトブロック８のテーパ面に摺接し且前記主体３の軸
心方向に移動し得る。該伝達体９と前記スライダ４とは
テーバ部１０を介して係合しており、ナツトブロック８
の移動によつて伝達体９が軸心方向に動きテーパ部１０
を介してスライダ４、即ちバイト５が半径方向に移動す
る様になっている。A slider 4 is provided on the main body 3 that rotates together with the main shaft 1 so as to be slidable in the radial direction, and a support 6 to which a cutting tool 5 is fixed is attached to the slider 4. A screw rod 7 is provided on the main body 3 so as to be rotatable in the radial direction, and a nut block 8 having a tapered end face of the main body is screwed onto the screw rod 7. Further, the transmission body 9 is in sliding contact with the tapered surface of the nut block 8 and can move in the axial direction of the main body 3. The transmission body 9 and the slider 4 are engaged with each other via a tapered portion 10, and the nut block 8
The transmission body 9 moves in the axial direction due to the movement of the tapered portion 10.
The slider 4, ie, the cutting tool 5, is moved in the radial direction via.

前記主体３にはリング１１が軸受１２を介して回転自在
に設けら杵、リング１１にはシリンダ室１３が穿設され
ており、ロンド部１４を中心方向に突出せるピストン１
５が前記シリンダ室１３に活動自在に嵌装されている。A ring 11 is rotatably provided on the main body 3 via a bearing 12, and a cylinder chamber 13 is bored in the ring 11.
5 is movably fitted in the cylinder chamber 13.

又、ロンド部１４は前記スクリューロッド７の一端に１
１１！着された歯車１６と係合可能となっており、又前
記シリンダ室１３は通路１７を介して電磁弁１８に接続
され、該電磁弁１８の作動によってシリンダ室１３への
空気の給排が行われる様になっている。Moreover, the rond part 14 is attached to one end of the screw rod 7.
11! The cylinder chamber 13 is connected to a solenoid valve 18 via a passage 17, and air is supplied and discharged to and from the cylinder chamber 13 by operating the solenoid valve 18. It's like being exposed.

斯かる従来の補正装置に於いて、切込量の補正する場合
電磁弁１８を作動させ圧縮空気をシリンダ室１３に送給
しピストン１５のロンド部１４を前記歯車１６と係合可
能な位置に突出させる。この状態で主軸１を回転させる
と主体３と共にスクリューロッド７が回転し且リング１
１が固定されているので、主体３−回転毎に一歯分だけ
歯車１６とロッド部１４とが係合してスクリューロッド
１が所要角度だけ回転しナラミルブロック８を移動させ
る。In such a conventional correction device, when correcting the depth of cut, the solenoid valve 18 is operated to supply compressed air to the cylinder chamber 13, and the rond portion 14 of the piston 15 is placed in a position where it can engage with the gear 16. Make it stand out. When the main shaft 1 is rotated in this state, the screw rod 7 rotates together with the main body 3, and the ring 1
1 is fixed, the gear 16 and the rod portion 14 engage by one tooth every time the main body 3 rotates, and the screw rod 1 rotates by the required angle, thereby moving the Naramil block 8.

而して、前記した如くナツトブロック８の移動によって
バイト５の位置が補正され、然も一回転ごとのバイト移
動旧が一定であるので、実測結果に基づき回転数を決定
しておけば切込量の自動補正ができる。As mentioned above, the position of the cutting tool 5 is corrected by the movement of the nut block 8, and since the cutting tool movement is constant for each revolution, the cutting speed can be adjusted by determining the rotation speed based on the actual measurement results. The amount can be automatically corrected.

従来の切込面の補正方法では第３図に示す様に、主軸１
の切欠ぎ１９を回転検出に利用し、固定側に近接スイッ
チ２０を取付け、近接スイッチ２０の検出結果に基づぎ
回転数をカウントし補正に要すべき回転数に対比させ、
実際の主軸１の回転数が予定の回転となる様な作動を行
わせている。In the conventional cutting surface correction method, as shown in Fig. 3, the main axis 1
The notch 19 is used for rotation detection, a proximity switch 20 is attached to the fixed side, the number of rotations is counted based on the detection result of the proximity switch 20, and compared to the number of rotations required for correction,
The operation is performed so that the actual rotational speed of the main shaft 1 becomes the planned rotational speed.

［発明が解決しようとする問題点］ 然し、従来の補正方法では、実際に主軸の回転数を検出
しなければならない為、近接スイッチ或はそれに代る何
らかの回転検出器が必要であり、機器構成が複雑になる
と共に検出器の信頼性が問題となる。又近接スイッチは
第３図の様に主軸１に近接して取付ける必要がある為に
、切削油、細い切屑、埃等が付着して回転数をミスカウ
ントする虞れがある。[Problems to be solved by the invention] However, in the conventional correction method, it is necessary to actually detect the rotation speed of the main shaft, so a proximity switch or some kind of rotation detector is required in place of it, and the equipment configuration is The reliability of the detector becomes a problem as it becomes more complex. Further, since the proximity switch needs to be installed close to the main shaft 1 as shown in FIG. 3, there is a risk that cutting oil, thin chips, dust, etc. may adhere to the switch and cause the number of revolutions to be miscounted.

［問題点を解決する為の手段］ 本発明は、上記実情に鑑みてなしたものであり、主軸の
回転によりバイトの切込ωを補正し得る切込量補正ユニ
ットを備えたボーリング工作機に於いて、前加工後の実
測結果によって求めた補正切込量より切込量補正に必要
な主軸回転数を求め、該主軸回転数に相当する時間だけ
主軸を回転せしめることを特徴とするものである。[Means for Solving the Problems] The present invention has been made in view of the above-mentioned circumstances, and is directed to a boring machine tool equipped with a depth of cut correction unit capable of correcting the depth of cut ω of the cutting tool by rotation of the main shaft. The main spindle rotation speed required for the correction of the depth of cut is determined from the corrected depth of cut obtained from the actual measurement results after pre-machining, and the spindle is rotated for a time corresponding to the spindle rotation speed. be.

［作　　　用］ 時間を設定して、主軸を回転させると時間で決められた
範囲で主軸の回転数が決定され、この回転数に応じて切
込量が補正される。[Function] When a time is set and the spindle is rotated, the rotation speed of the spindle is determined within the range determined by the time, and the depth of cut is corrected according to this rotation speed.

［実　施　例］ 以下図面を参照しつつ本発明の詳細な説明する。[Example] The present invention will be described in detail below with reference to the drawings.

本発明では゛特に主軸の回転数を検出することなく所望
の切込量の補正を行おうとするものである。The present invention attempts to correct the desired depth of cut without particularly detecting the rotational speed of the spindle.

前加工後の実測結果によって仕上加工する場合の補正切
込ｍが求められる。この補正切込量が求められることに
より補正作業時に主軸１（第１図参照）を何回転しなけ
ればならないかが求められる。The corrected depth of cut m for finishing machining is determined based on the actual measurement results after pre-machining. By determining this correction depth of cut, it is possible to determine how many revolutions the spindle 1 (see FIG. 1) must make during the correction work.

又、主軸１は定速回転によって駆動されるので、回転数
が求められれば補正作業時必要な主軸１の回転時間を求
めることができる。Further, since the main shaft 1 is driven by constant speed rotation, if the number of rotations is determined, the rotation time of the main shaft 1 necessary for the correction work can be determined.

而して、本発明では切込量の補正を主軸の回転数そのも
のではなく主軸の回転時間によって行っている。Therefore, in the present invention, the depth of cut is corrected based on the rotation time of the spindle rather than the rotation speed of the spindle itself.

この場合、主軸１の回転起動時、停止時は、主軸が定速
回転を行わないので、厳密には主軸の回転数即ち回転時
間とはならない。In this case, when the spindle 1 starts rotating and stops, the spindle does not rotate at a constant speed, so strictly speaking, it does not correspond to the rotational speed of the spindle, that is, the rotation time.

然し、目的とする孔仕上精度がＨ７公差以下であれば充
分実用に足りる。However, if the desired hole finishing accuracy is less than or equal to the H7 tolerance, it is sufficient for practical use.

次に、第２図を併用して本発明を説明する。Next, the present invention will be explained with reference to FIG.

必要な回転数は補正量（補正切込伍）を１回転当りの補
正量で割って求められ、更に補正回転間を主軸の１秒当
りの回転数で割り補正に必要な時間〈秒）を求める。主
軸を起動し補正に必要な時間だけ主軸１を回転させる。The required number of rotations is calculated by dividing the correction amount (correction depth of cut) by the correction amount per rotation, and then dividing the correction rotation interval by the rotation speed of the spindle per second and calculating the time (seconds) required for correction. demand. The main shaft is started and the main shaft 1 is rotated for the time required for correction.

時間をカウントし必要な時間を経過したら主軸を停止さ
せ補正を終了する。The time is counted, and when the required time has elapsed, the spindle is stopped and the correction is completed.

尚、本発明を実施した場合の実績は表によって示してあ
り、この実績により本方法が充分実用に足ることが証明
される。Incidentally, the results obtained when the present invention was implemented are shown in the table, and these results prove that the present method is sufficiently practical.

表 該表に於いて主軸１回転での補正量は２ＪＪＩｌｌ′ｃ
ある。In the table, the amount of correction per spindle rotation is 2JJIll'c
be.

［発明の効果］ 以上述べた如く本発明によれば、近接スイッチ等主軸の
回転数を検出する為の検出器が不要となり検出器を原因
とする信頼性の低下、誤操作を防止し得ると共に回転数
検出に関連する電気系構成物を省略し得て装！ｆｆ１ｉ
ｌｊ格を但減できる。[Effects of the Invention] As described above, according to the present invention, there is no need for a detector for detecting the rotation speed of the main shaft such as a proximity switch, and it is possible to prevent a decrease in reliability and erroneous operation caused by the detector, and to prevent rotation The electrical system components related to number detection can be omitted! ff1i
The lj case can be reduced.

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

第１図は切込追補正装置の１例を示す説明図、第２図は
本発明を説明するところのフローチャート、第３図は従
来例の説明図である。 １は主軸、２は切込ｆ！！補正補正ユニー、５はバイト
、７はスクリューロッド、８はナツトブロック、９は伝
達系を示す。FIG. 1 is an explanatory diagram showing one example of a depth of cut correction device, FIG. 2 is a flowchart for explaining the present invention, and FIG. 3 is an explanatory diagram of a conventional example. 1 is the main axis, 2 is the cutting depth f! ! A correction unit, 5 is a cutting tool, 7 is a screw rod, 8 is a nut block, and 9 is a transmission system.

Claims (1)

【特許請求の範囲】[Claims] １）主軸の回転によりバイトの切込量を補正し得る切込
量補正ユニットを備えたボーリング工作機に於いて、前
加工後の実測結果によつて求めた補正切込量より切込量
補正に必要な主軸回転数を求め、該主軸回転数に相当す
る時間だけ主軸を回転せしめることを特徴とする自動ボ
ーリング径補正装置。1) In a boring machine tool equipped with a depth of cut correction unit that can correct the depth of cut of the cutting tool by rotating the spindle, the depth of cut is corrected based on the corrected depth of cut determined from the actual measurement results after pre-machining. 1. An automatic boring diameter correction device characterized by determining the spindle rotation speed necessary for the spindle rotation speed and rotating the spindle for a time corresponding to the spindle rotation speed.