JP5222066B2

JP5222066B2 - Inner diameter measuring device

Info

Publication number: JP5222066B2
Application number: JP2008227491A
Authority: JP
Inventors: 昭二三好; 弘章市原
Original assignee: TOKUSHIN ELECTRIC INDUSTRIES CO., LTD.
Current assignee: TOKUSHIN ELECTRIC INDUSTRIES CO., LTD.
Priority date: 2008-09-04
Filing date: 2008-09-04
Publication date: 2013-06-26
Anticipated expiration: 2028-09-04
Also published as: JP2010060468A

Description

本発明は、内輪等のワークに設けた凹部の内径を測定する内径測定装置に関する。 The present invention relates to an inner diameter measuring device that measures the inner diameter of a recess provided in a workpiece such as an inner ring.

図４には、一般的な円錐ころ軸受け１の構成を示している。円錐ころ軸受け１は、円環状を成す内輪２と、内輪２外周の軌道面に転動自在に配されるころ部材３と、ころ部材３を介して内輪２が回動自在に嵌合する円環状の外輪４とで、主体を形成している。 FIG. 4 shows a configuration of a general tapered roller bearing 1. The tapered roller bearing 1 includes an inner ring 2 having an annular shape, a roller member 3 that is rotatably disposed on a raceway surface of the inner ring 2, and a circle in which the inner ring 2 is rotatably fitted via the roller member 3. A main body is formed by the annular outer ring 4.

内輪２の中央には断面円形状の貫通孔５が設けてあり、この貫通孔５の内径については、従来から内輪２の製造ライン上において全数検査することが行われている。ここでの内径測定には、例えば特許文献１に記載されているような空気マイクロメータを用いた内径測定装置が好適に用いられる。この内径測定装置によれば、内輪２に設けてある貫通孔５内に、僅かな隙間を介して空気マイクロメータの測定ヘッドを挿入し、挿入位置において測定ヘッドのノズル口から側方に空気を噴出してその背圧等を検知することにより、貫通孔の内径が測定される。 A through hole 5 having a circular cross section is provided at the center of the inner ring 2, and the inner diameter of the through hole 5 has been conventionally inspected on the production line of the inner ring 2. For the inner diameter measurement here, for example, an inner diameter measuring device using an air micrometer as described in Patent Document 1 is preferably used. According to this inner diameter measuring apparatus, a measurement head of an air micrometer is inserted into a through hole 5 provided in the inner ring 2 through a slight gap, and air is laterally passed from the nozzle opening of the measurement head at the insertion position. The inner diameter of the through hole is measured by jetting out and detecting the back pressure and the like.

このように、製造ライン上での全数検査という形で内径を測定する場合、内輪２等の大量生産されるワーク７を次々と測定する必要があるため、測定するたびに空気マイクロメータの校正作業を行うことは困難である。したがって、環境温度等に変化が生じた場合には、精密な測定結果を得ることができない場合があるという問題があった。
特開２００１−１０８４２８号公報 In this way, when measuring the inner diameter in the form of 100% inspection on the production line, it is necessary to measure the mass-produced work 7 such as the inner ring 2 one after another, so that the calibration work of the air micrometer is performed each time measurement is performed. Is difficult to do. Therefore, there has been a problem that accurate measurement results may not be obtained when the environmental temperature or the like changes.
JP 2001-108428 A

本発明は上記問題点に鑑みて発明したものであって、製造ライン上での全数検査という形で内径を測定する場合であっても、測定のたびに校正作業を行って精密な測定結果を得ることのできる内径測定装置を提供することを、課題とする。 The present invention has been invented in view of the above problems, and even when measuring the inner diameter in the form of 100% inspection on the production line, a calibration operation is performed for each measurement to obtain a precise measurement result. It is an object to provide an inner diameter measuring device that can be obtained.

上記課題を解決するために本発明を、測定対象である凹部８を有するワーク７が配置されるテーブル９と、テーブル９に配置してあるワーク７の凹部８内に挿入される空気マイクロメータの測定ヘッド６と、テーブル９に配置してあるワーク７の上方に位置する基準器１０とを具備した内径測定装置とする。基準器１０は校正用の貫通孔１８を有するものであり、空気噴出用のノズル口１６を有する測定ヘッド６は、基準器１０の貫通孔１８内にノズル口１６を位置させる上方の校正位置と、ワーク７の凹部８内にノズル口１６を位置させる下方の測定位置との間で往復駆動されるものである。 In order to solve the above-mentioned problems, the present invention relates to a table 9 on which a workpiece 7 having a recess 8 to be measured is disposed, and an air micrometer inserted into the recess 8 of the workpiece 7 disposed on the table 9. The inner diameter measuring device includes a measuring head 6 and a reference device 10 located above the workpiece 7 arranged on the table 9. The reference device 10 has a calibration through-hole 18, and the measuring head 6 having the air ejection nozzle port 16 has an upper calibration position where the nozzle port 16 is positioned in the through-hole 18 of the reference device 10. The reciprocating drive is performed between the lower measurement position where the nozzle port 16 is positioned in the recess 8 of the work 7.

上記構成の内径測定装置によれば、製造ライン上で大量生産されるワーク７を全数検査する場合であっても、ワーク７を測定するたびに、上方に位置させた基準器１０を用いて空気マイクロメータの校正作業を行うことができる。したがって、環境温度等に変化が生じた場合であっても全てのワーク７に対して精密な測定結果を得ることができる。 According to the inner diameter measuring apparatus having the above-described configuration, even when all the workpieces 7 that are mass-produced on the production line are inspected, each time the workpieces 7 are measured, the air is measured using the reference device 10 positioned above. Micrometer calibration work can be performed. Therefore, accurate measurement results can be obtained for all the workpieces 7 even when the environmental temperature or the like changes.

また、上記構成の内径測定装置にあっては、測定時に基準器１０を降下させてワーク７の上面に乗せる上下駆動機構１１と、測定時にテーブル９と測定ヘッド６を相対的に回転させる回転駆動機構１２とを具備することが好適である。このようにすることで、ワーク７に設けた凹部８の内径を測定するとともに、凹部８の内径面の真円度についても測定することができる。しかも、ワーク７が軽量のものであっても、測定時には基準器１０の重量をワーク７に付加してテーブル９との間の摩擦抵抗を大幅に増大させるので、回転時にワーク７がテーブル９上で不意に動くことは防止される。したがって、ワーク７が軽量であっても、ワーク７をテーブル９に固定するための特別な機構や手間を要することなく、基準器１０を利用して速やかに且つ低コストで真円度を測定することができる。 In the inner diameter measuring apparatus having the above-described configuration, the vertical drive mechanism 11 that lowers the reference device 10 during measurement and places it on the upper surface of the work 7, and the rotational drive that relatively rotates the table 9 and the measurement head 6 during measurement. It is preferable to include the mechanism 12. By doing in this way, while measuring the internal diameter of the recessed part 8 provided in the workpiece | work 7, the roundness of the internal diameter surface of the recessed part 8 can also be measured. Moreover, even if the workpiece 7 is light, the weight of the reference device 10 is added to the workpiece 7 during measurement, and the frictional resistance with the table 9 is greatly increased. It is prevented from moving unexpectedly. Therefore, even if the workpiece 7 is lightweight, the roundness is measured quickly and at low cost by using the reference device 10 without requiring a special mechanism or labor for fixing the workpiece 7 to the table 9. be able to.

また、測定ヘッド６が挿入される凹部８は、ワーク７に形成してある断面円形状の貫通孔５であることが好適である。このようにすることで、ワーク７をテーブル９上の所定箇所に順次セットしていけば、上方に位置させた基準器１０によって校正作業を行った空気マイクロメータの測定ヘッド６を用いて、ワーク７に形成した断面円形状の貫通孔５の内径を速やかに測定していくことができる。したがって、製造ライン上での全数検査という形で内径を測定する場合であっても、全てのワーク７に対して、環境温度等の変化に影響されることなく精密な測定結果を得ることが可能となる。 The recess 8 into which the measurement head 6 is inserted is preferably a through-hole 5 having a circular cross section formed in the workpiece 7. In this way, when the workpiece 7 is sequentially set at a predetermined position on the table 9, the workpiece is measured using the measuring head 6 of the air micrometer that has been calibrated by the reference device 10 positioned above. 7 can be quickly measured. Therefore, even when measuring the inner diameter in the form of 100% inspection on the production line, it is possible to obtain accurate measurement results for all workpieces 7 without being affected by changes in the environmental temperature or the like. It becomes.

本発明は、製造ライン上での全数検査という形で内径を測定する場合であっても、測定のたびに校正作業を行うことにより、環境温度等の変化に影響されることなく精密な測定結果を得ることができるという効果を奏する。 Even when measuring the inner diameter in the form of 100% inspection on the production line, the present invention provides accurate measurement results without being affected by changes in environmental temperature, etc., by performing calibration work for each measurement. There is an effect that can be obtained.

本発明を添付図面に示す実施形態に基づいて説明する。図１、図２には、本発明の実施形態における一例の内径測定装置を概略的に示している。図１は測定作業時、図２は校正作業時である。 The present invention will be described based on embodiments shown in the accompanying drawings. 1 and 2 schematically show an inner diameter measuring apparatus as an example in the embodiment of the present invention. FIG. 1 shows a measurement operation, and FIG. 2 shows a calibration operation.

本例の内径測定装置は、円錐ころ軸受け１を成す内輪２に設けた貫通孔５の内径を測定するものである。この内径測定装置の構造は、空気マイクロメータの測定ヘッド６を貫通孔５内に挿入した状態で、測定ヘッド６から側方に空気を噴出させることで、検知される背圧等を基にして貫通孔５の内径を測定する構造である。また、測定ヘッド６から側方に空気を噴出させると同時に、測定ヘッド６と内輪２を相対的に回転させることで、貫通孔５の内径面の真円度についても測定可能になっている。 The inner diameter measuring device of this example measures the inner diameter of the through hole 5 provided in the inner ring 2 constituting the tapered roller bearing 1. The structure of the inner diameter measuring device is based on the detected back pressure or the like by ejecting air laterally from the measuring head 6 with the measuring head 6 of the air micrometer inserted into the through hole 5. In this structure, the inner diameter of the through hole 5 is measured. In addition, the roundness of the inner diameter surface of the through-hole 5 can be measured by causing air to be ejected laterally from the measurement head 6 and simultaneously rotating the measurement head 6 and the inner ring 2.

なお、本例では、上記のように円錐ころ軸受け１の内輪２を測定対象のワーク７とし、該内輪２の貫通孔５の内径や真円度を測定するようになっているが、該内輪２の貫通孔５以外の内径や真円度を測定することも可能である。つまり、内輪２に設けた貫通孔５に限らず、ワーク７に貫通又は凹ませて形成してある凹部８の内径や真円度であれば、本発明の内径測定装置を用いて測定可能である。 In this example, as described above, the inner ring 2 of the tapered roller bearing 1 is used as the workpiece 7 to be measured, and the inner diameter and roundness of the through hole 5 of the inner ring 2 are measured. It is also possible to measure the inner diameter and roundness other than the two through holes 5. That is, not only the through-hole 5 provided in the inner ring 2 but also the inner diameter and roundness of the recess 8 formed by penetrating or denting the work 7 can be measured using the inner diameter measuring device of the present invention. is there.

本例の内径測定装置は、貫通孔５の開口部分が上方を向くようにして内輪２を所定位置に配置させるテーブル９と、テーブル９の上面１３に配置してある内輪２の貫通孔５に対して該貫通孔５の上端開口から挿入される空気マイクロメータの測定ヘッド６と、テーブル９に配置された内輪２の上方に保持されるリング状の基準器１０と、基準器１０を上下動させる上下駆動機構１１と、真円度を測定するに際してテーブル９を回転駆動させる回転駆動機構１２とを具備している。 The inner diameter measuring device of this example includes a table 9 that places the inner ring 2 in a predetermined position so that an opening portion of the through hole 5 faces upward, and a through hole 5 of the inner ring 2 that is arranged on the upper surface 13 of the table 9. On the other hand, a measurement head 6 of an air micrometer inserted from the upper end opening of the through hole 5, a ring-shaped reference device 10 held above the inner ring 2 disposed on the table 9, and the reference device 10 are moved up and down. And a rotary drive mechanism 12 that drives the table 9 to rotate when measuring the roundness.

以下、各構成について更に詳述する。テーブル９はその上面１３を水平に形成したものであって、該上面１３のうち少なくとも内輪２を配置する所定箇所に、粗いローレット加工を施してある。上記ローレット加工を施すことにより、前工程にて内輪２に付着した研磨油を逃がすための微細溝１４が、上面１３に多数凹設されている（図１（ｂ）参照）。 Hereinafter, each configuration will be further described in detail. The table 9 has an upper surface 13 formed horizontally, and a rough knurling process is applied to at least a predetermined portion of the upper surface 13 where the inner ring 2 is disposed. By performing the knurling process, a large number of fine grooves 14 for releasing the polishing oil adhering to the inner ring 2 in the previous step are formed in the upper surface 13 (see FIG. 1B).

測定ヘッド６は円柱状を成しており、その外周面１５の下端近傍には、空気噴出用のノズル口１６を周方向に１８０度ずれた箇所に一対開口させている。測定ヘッド６の内部には給気路１７を貫通形成しており、該給気路１７の上流端を、空気マイクロメータの空気ポンプ（図示は省略）に接続させている。給気路１７は、その流路途中に設けた分岐箇所よりも下流側を、互いに逆方向にむけて二手に分岐させており、分岐したそれぞれの下流端にノズル口１６を形成している。測定ヘッド６は支持機構２５によって支持されるとともに、図１に示す測定位置と図２に示す校正位置との間の所定範囲内で、上下方向に往復駆動されるようになっている。 The measuring head 6 has a columnar shape, and a pair of air ejection nozzle ports 16 are opened near the lower end of the outer peripheral surface 15 at positions shifted by 180 degrees in the circumferential direction. An air supply path 17 is formed through the measuring head 6, and an upstream end of the air supply path 17 is connected to an air pump (not shown) of an air micrometer. The air supply path 17 is bifurcated downstream from the branch location provided in the middle of the flow path in opposite directions, and a nozzle port 16 is formed at each branched downstream end. The measuring head 6 is supported by a support mechanism 25 and is reciprocated in the vertical direction within a predetermined range between the measurement position shown in FIG. 1 and the calibration position shown in FIG.

基準器１０は、その中央に貫通孔１８を有するリング状の部材である。貫通孔１８の内径面は、内輪２の貫通孔５の内径面の基準寸法となるように、精密に寸法形成してある。また、図１に示すように内輪２の上面に基準器１０を乗せたときには、内輪２の貫通孔５と基準器１０の貫通孔１８とが、上下一直線状に連通するように設けている。測定ヘッド６は、上方に位置する基準器１０の貫通孔１８を通じて、下方に位置する内輪２の貫通孔５内へと挿入される。基準器１０の外周面下部には、該基準器１０を持ち上げる際に用いる係止溝１９を、全周に亘って凹設している。 The reference device 10 is a ring-shaped member having a through hole 18 at the center thereof. The inner diameter surface of the through hole 18 is precisely dimensioned so as to be the reference dimension of the inner diameter surface of the through hole 5 of the inner ring 2. Further, as shown in FIG. 1, when the reference device 10 is placed on the upper surface of the inner ring 2, the through hole 5 of the inner ring 2 and the through hole 18 of the reference device 10 are provided so as to communicate in a straight line. The measuring head 6 is inserted into the through hole 5 of the inner ring 2 located below through the through hole 18 of the reference device 10 located above. A locking groove 19 used for lifting the reference device 10 is formed in the lower part of the outer peripheral surface of the reference device 10 over the entire periphery.

上下駆動機構１１は、基準器１０を引掛けて水平姿勢を保持したまま該基準器１０を上下動させるリフト機構２０から成る。リフト機構２０は、下端が開口した円筒状のリフト部材２１を上下動自在に備え、該リフト部材２１内に基準器１０を収納した構造である。リフト部材２１の下端開口縁からは、凸リブ状のフック２２を内方に延設しており、基準器１０に凹設した係止溝１９が、該フック２２によって下方から引掛け係止されるようになっている。 The vertical drive mechanism 11 includes a lift mechanism 20 that moves the reference device 10 up and down while hooking the reference device 10 and maintaining a horizontal posture. The lift mechanism 20 includes a cylindrical lift member 21 having an open lower end that can freely move up and down, and the reference device 10 is housed in the lift member 21. A convex rib-like hook 22 extends inwardly from the opening edge of the lower end of the lift member 21, and a locking groove 19 recessed in the reference device 10 is hooked and locked from below by the hook 22. It has become so.

リフト部材２１が上下動する所定範囲の上端位置において（図２参照）、基準器１０は、内輪２に対してその上方に浮いた状態となってリフト部材２１に支持される。また、リフト部材２１が上下動する所定範囲の下端位置において（図１参照）、基準器１０は内輪２の上面に乗せられ、内輪２に対して該基準器１０の重量全体をかけるように配置される。 At the upper end position of a predetermined range in which the lift member 21 moves up and down (see FIG. 2), the reference device 10 is supported by the lift member 21 in a state of floating above the inner ring 2. Further, at the lower end position of a predetermined range in which the lift member 21 moves up and down (see FIG. 1), the reference device 10 is placed on the upper surface of the inner ring 2 and is arranged so as to apply the entire weight of the reference device 10 to the inner ring 2. Is done.

上記構成から成る本例の内径測定装置を用いて、内輪２の貫通孔５の内径や真円度を測定するにあたっては、まずテーブル９の上面１３の所定位置に、貫通孔５が上下方向に貫通した姿勢となるように内輪２を配置する。このとき、測定ヘッド６は貫通孔５の上方の校正位置にて待機させておく。また、基準器１０についても、リフト部材２１により引っ掛けて持ち上げた状態で内輪２の上方に待機させておく（図２参照）。この待機状態において、校正位置にある測定ヘッド６の下端部は基準器１０の貫通孔１８内に位置し、測定ヘッド６の一対のノズル口１６は、貫通孔１８の内周面と対向するように位置する。 When measuring the inner diameter and roundness of the through-hole 5 of the inner ring 2 using the inner-diameter measuring apparatus of this example having the above-described configuration, first, the through-hole 5 is placed in a predetermined position on the upper surface 13 of the table 9 in the vertical direction. The inner ring 2 is arranged so as to have a penetrating posture. At this time, the measuring head 6 is kept waiting at the calibration position above the through hole 5. Further, the reference device 10 is also kept waiting above the inner ring 2 while being hooked and lifted by the lift member 21 (see FIG. 2). In this standby state, the lower end portion of the measuring head 6 at the calibration position is located in the through hole 18 of the reference device 10, and the pair of nozzle ports 16 of the measuring head 6 are opposed to the inner peripheral surface of the through hole 18. Located in.

ここで、基準器１０に設けてある貫通孔１８を利用して、空気マイクロメータの校正を行う。具体的には、校正位置にある測定ヘッド６において、基準器１０の貫通孔１８の内径面と対向する一対のノズル口１６から空気を噴出させて該貫通孔１８の内径を測定し、この測定結果を基にして空気マイクロメータの校正を行う。 Here, the air micrometer is calibrated using the through hole 18 provided in the reference device 10. Specifically, in the measuring head 6 at the calibration position, air is ejected from a pair of nozzle ports 16 facing the inner diameter surface of the through hole 18 of the reference device 10 to measure the inner diameter of the through hole 18, and this measurement is performed. Calibrate the air micrometer based on the results.

次いで、校正作業の完了した測定ヘッド６を降下させるとともに、リフト部材２１と共に基準器１０を降下させていき、図１に示す測定状態に移行する。この測定状態において、測定位置にある測定ヘッド６は内輪２の貫通孔５内に先端側から挿入され、測定ヘッド６の一対のノズル口１６は貫通孔５の内径面と対向して位置することになる。また、基準器１０は、リフト部材２１から離間したうえで内輪２の上面に乗せ置かれる。 Next, the measuring head 6 that has been calibrated is lowered, and the reference device 10 is lowered together with the lift member 21 to shift to the measurement state shown in FIG. In this measurement state, the measurement head 6 at the measurement position is inserted into the through hole 5 of the inner ring 2 from the front end side, and the pair of nozzle ports 16 of the measurement head 6 are positioned to face the inner diameter surface of the through hole 5. become. Further, the reference device 10 is placed on the upper surface of the inner ring 2 after being separated from the lift member 21.

上記測定状態にセットしたうえで、空気マイクロメータの空気ポンプから給気路１７内に空気を送り込み、一対のノズル口１６から貫通孔５の内径面に向けて空気を噴出させるとともに、テーブル９を鉛直軸Ａ中心に回転駆動させる。なお、テーブル９の回転中心軸となる鉛直軸Ａは、内輪２の貫通孔５の中心軸と一致し、且つ、測定ヘッド６の中心軸と一致するように設けている。 After setting in the above measurement state, air is sent from the air pump of the air micrometer into the air supply path 17, and air is ejected from the pair of nozzle ports 16 toward the inner diameter surface of the through hole 5, and the table 9 is It is driven to rotate about the vertical axis A. The vertical axis A, which is the rotation center axis of the table 9, is provided so as to coincide with the center axis of the through hole 5 of the inner ring 2 and coincide with the center axis of the measurement head 6.

ここで、仮に、基準器１０を乗せない状態のまま貫通孔５内に測定ヘッド６を挿入し、テーブル９を回転させた場合には、軽量である内輪２が不意に動きやすくなり、内輪２をテーブル９と同期して回転させることが困難となる。これは、貫通孔５と測定ヘッド６との間には僅かな隙間（例えば０．０３ｍｍ）しか存在しないため、内輪２が回転の影響を受けてしまうからである。 Here, if the measuring head 6 is inserted into the through-hole 5 and the table 9 is rotated while the reference device 10 is not placed, the inner ring 2 that is lightweight is likely to move unexpectedly. Is difficult to rotate in synchronization with the table 9. This is because there is only a slight gap (for example, 0.03 mm) between the through hole 5 and the measuring head 6, and therefore the inner ring 2 is affected by the rotation.

これに対して、上記のように測定時には内輪２の上に基準器１０を乗せることで、内輪２とテーブル９との間の摩擦抵抗を大幅に増大させ、内輪２をテーブル９上に確実に保持したまま一体に回転させることが可能となる。そして、テーブル９と共に内輪２を１８０度回転させながら、空気マイクロメータにて背圧を測定することにより、貫通孔５の内径とともにその内径面の真円度を測定することができる。 On the other hand, by placing the reference device 10 on the inner ring 2 at the time of measurement as described above, the frictional resistance between the inner ring 2 and the table 9 is greatly increased, and the inner ring 2 is securely placed on the table 9. It is possible to rotate it integrally while holding it. Then, by measuring the back pressure with an air micrometer while rotating the inner ring 2 together with the table 9, the roundness of the inner diameter surface of the through hole 5 can be measured.

つまり、測定時に基準器１０を乗せるという手段を採用することによって、内輪２のような軽量のワーク７であっても、測定のたびにテーブル９上に固定するといった手間や特別な機構を要することなく、確実に且つ速やかに真円度を測定することが可能となる。したがって、本例の内径測定装置によれば、内輪２の貫通孔５の真円度測定についても、製造ライン上での全数検査という形で実施することが可能となる。 In other words, by adopting a means for placing the reference device 10 at the time of measurement, even a lightweight work 7 such as the inner ring 2 needs to be fixed on the table 9 each time it is measured, and a special mechanism is required. It is possible to measure the roundness reliably and promptly. Therefore, according to the inner diameter measuring apparatus of this example, the roundness measurement of the through-hole 5 of the inner ring 2 can be performed in the form of 100% inspection on the production line.

換言すれば、本例の基準器１０は、空気マイクロメータの基準器１０としての機能に加え、測定時において軽量の内輪２に重量を付加する重り部２３としての機能を併せ持つものである。 In other words, the reference device 10 of this example has a function as the weight portion 23 that adds weight to the lightweight inner ring 2 at the time of measurement in addition to the function as the reference device 10 of the air micrometer.

ところで図１等に示すように、測定ヘッド６の外周面１５の直径については、内径や真円度を測定するときに基準器１０の貫通孔１８内に位置する部分の直径を、他の部分（特にノズル口１６を開口させている下端部分）の直径よりも、僅かに小さく設けている。このように設けることで、テーブル９と同期して内輪２や基準器１０を回転させる際に、基準器１０の貫通孔１８の内径面に測定ヘッド６に当たって磨耗することを防止している。 By the way, as shown in FIG. 1 etc., the diameter of the outer peripheral surface 15 of the measuring head 6 is the same as the diameter of the portion located in the through hole 18 of the reference device 10 when measuring the inner diameter and roundness. It is provided slightly smaller than the diameter of (particularly the lower end portion where the nozzle port 16 is opened). By providing in this way, when the inner ring 2 and the reference device 10 are rotated in synchronization with the table 9, the inner diameter surface of the through hole 18 of the reference device 10 is prevented from hitting the measuring head 6 and being worn.

測定が完了すると、再び基準器１０を引っ掛けて上方の校正位置にまで持ち上げておき、図２に示す状態において、測定完了後の内輪２を次回測定予定の内輪２と交換する。そして、内輪２の交換時間を利用して、再び基準器１０による空気マイクロメータの校正作業を行う。したがって、一つの内輪２を測定する直前には必ずマイクロメータの校正作業を行うことができ、大量の内輪２を次々と測定する場合であっても、その内径や真円度を、環境温度等の変化に影響されることなく精密に測定することが可能となる。 When the measurement is completed, the reference device 10 is again hooked and raised to the upper calibration position. In the state shown in FIG. 2, the inner ring 2 after completion of the measurement is replaced with the inner ring 2 scheduled for the next measurement. Then, using the replacement time of the inner ring 2, the calibration operation of the air micrometer by the reference device 10 is performed again. Therefore, the micrometer can always be calibrated immediately before measuring one inner ring 2, and even when a large number of inner rings 2 are measured one after another, the inner diameter and roundness of the inner ring 2 can be determined according to the environmental temperature, etc. It is possible to measure accurately without being affected by the change of the.

図３には、本例の内径測定装置を用いた内径・真円度測定工程を、内輪２の製造ライン中に組み入れた例を示している。図示例では、素材投入、端面研磨、軌道面研磨、ころ端面との接触面研磨、内径面研磨の各工程をこの順に実施した後に、本例の内径測定装置を用いた内径・真円度測定工程を実施し、その後に、軌道面超仕上げ工程、組立工程を順に実施する。 FIG. 3 shows an example in which the inner diameter / roundness measuring step using the inner diameter measuring apparatus of this example is incorporated in the production line of the inner ring 2. In the example shown in the figure, after the raw material charging, end surface polishing, raceway surface polishing, contact surface polishing with the roller end surface, and inner surface polishing are performed in this order, the inner diameter / roundness measurement is performed using the inner diameter measuring device of this example. A process is implemented, and a track surface superfinishing process and an assembly process are implemented in order after that.

内径・真円度測定工程においては、内径面研磨後の内輪２を内径測定装置のテーブル９上に順次搬していき、基準器１０によって空気マイクロメータに校正作業を施した後に、搬送された内輪２の上面に基準器１０を乗せ、貫通孔５内に測定ヘッド６を挿入した状態でテーブル９を回転させることで、内径および真円度測定を行う。なお、直前の軌道面、内径面研磨工程において内輪２の表面には研磨油が付着しているが、既述のとおりテーブル９の上面１３には多数の微細溝１４を施してあるので、この微細溝１４を通じて研磨油が逃げることによって、油膜による内輪２の滑りは防止される。 In the inner diameter / roundness measurement step, the inner ring 2 after inner diameter surface polishing was sequentially carried onto the table 9 of the inner diameter measuring device, and after the calibration operation was performed on the air micrometer by the reference device 10, the inner ring 2 was conveyed. The reference device 10 is placed on the upper surface of the inner ring 2, and the inner diameter and the roundness are measured by rotating the table 9 with the measurement head 6 inserted into the through hole 5. In the previous raceway surface and inner diameter surface polishing step, polishing oil adheres to the surface of the inner ring 2, but since the upper surface 13 of the table 9 is provided with a number of fine grooves 14 as described above, As the polishing oil escapes through the fine grooves 14, the slip of the inner ring 2 due to the oil film is prevented.

そして、空気マイクロメータで測定される貫通孔５の内径および真円度が共に適正範囲内にある場合には、そのまま次の軌道面超仕上げ工程にまでその内輪２を搬送する。一方、貫通孔５の内径および真円度の少なくとも一方が適正範囲外となる場合には、その内輪２を次工程にまで搬送することなく製造ラインから排除する。 When both the inner diameter and the roundness of the through-hole 5 measured by the air micrometer are within the appropriate ranges, the inner ring 2 is conveyed as it is to the next raceway surface superfinishing process. On the other hand, when at least one of the inner diameter and the roundness of the through hole 5 falls outside the proper range, the inner ring 2 is removed from the production line without being transported to the next process.

なお、図１、図２に示す内輪２は鍔部分を有さない形態となっているが、鍔部分を有する形態の内輪２を製造する場合にあっては、図３に示す軌道面研磨工程と内径面研磨工程との間に、更に鍔面研磨工程を組み入れる。 In addition, although the inner ring | wheel 2 shown in FIG. 1, FIG. 2 becomes a form which does not have a collar part, when manufacturing the inner ring 2 of a form which has a collar part, a track surface grinding | polishing process shown in FIG. Further, a side surface polishing step is incorporated between the inner surface polishing step and the inner surface polishing step.

このように、本例の内径測定装置によれば、製造ライン上での全数検査という形で、内輪２の貫通孔５の内径検査や真円度検査を、精密に且つ速やかに行うことができる。しかも、このような測定を実現するために複雑な構造は必要でないため、上記全数検査が低コストで実施可能となる。 As described above, according to the inner diameter measuring apparatus of this example, the inner diameter inspection and the roundness inspection of the through-hole 5 of the inner ring 2 can be accurately and quickly performed in the form of 100% inspection on the production line. . Moreover, since a complicated structure is not necessary to realize such measurement, the 100% inspection can be performed at a low cost.

本例では、回転駆動機構１２として測定時にテーブル９のみを回転させる機構を採用し、更なる低コスト化を実現しているが、他の機構を用いてもよい。つまり、測定時にテーブル９と測定ヘッド６が鉛直軸Ａ中心に相対的に回転する機構であればよいので、例えば測定ヘッド６のみを回転させる機構であってもよいし、或いは、テーブル９と測定ヘッド６を共に回転させる機構であってもよい。 In this example, a mechanism for rotating only the table 9 at the time of measurement is adopted as the rotational drive mechanism 12 to realize further cost reduction, but other mechanisms may be used. That is, any mechanism that rotates the table 9 and the measuring head 6 relative to the center of the vertical axis A at the time of measurement may be used. For example, a mechanism that rotates only the measuring head 6 may be used. It may be a mechanism that rotates the head 6 together.

本発明の実施形態における一例の内径測定装置の測定状態を示しており、（ａ）は概略的な側断面図、（ｂ）は（ａ）のＰ部拡大図である。The measurement state of the internal diameter measuring apparatus of an example in embodiment of this invention is shown, (a) is a schematic sectional side view, (b) is the P section enlarged view of (a). 同上の内径測定装置の校正状態を示す概略的な側断面図である。It is a schematic sectional side view which shows the calibration state of an internal diameter measuring apparatus same as the above. 同上の内径測定装置を用いた内径測定工程を有する、円錐ころ軸受の内輪製造工程のフロー説明図である。It is flow explanatory drawing of the inner ring manufacturing process of a tapered roller bearing which has an internal diameter measurement process using the internal diameter measuring apparatus same as the above. 円錐ころ軸受けの説明図である。It is explanatory drawing of a tapered roller bearing.

Explanation of symbols

１円錐ころ軸受け
２内輪
５貫通孔
６測定ヘッド
７ワーク
８凹部
９テーブル
１０基準器
１１上下駆動機構
１２回転駆動機構
１６ノズル口
１８貫通孔 DESCRIPTION OF SYMBOLS 1 Tapered roller bearing 2 Inner ring 5 Through-hole 6 Measuring head 7 Work piece 8 Recess 9 Table 10 Reference device 11 Vertical drive mechanism 12 Rotation drive mechanism 16 Nozzle port 18 Through hole

Claims

A table on which a workpiece having a concave portion to be measured is arranged, a measurement head of an air micrometer inserted into the concave portion of the workpiece arranged on the table, and a reference located above the workpiece arranged on the table An internal diameter measuring device comprising a measuring device, wherein the reference device has a calibration through-hole, and the measuring head having an air ejection nozzle port has a nozzle port in the through-hole of the reference device. An inner diameter measuring device which is reciprocally driven between an upper calibration position to be positioned and a lower measurement position to position a nozzle opening in a concave portion of a workpiece.

2. The inner diameter measurement according to claim 1, further comprising: a vertical drive mechanism that lowers the reference device during measurement and places it on the upper surface of the work; and a rotary drive mechanism that relatively rotates the table and the measurement head during measurement. apparatus.

The inner diameter measuring device according to claim 1 or 2, wherein the recess into which the measuring head is inserted is a through-hole having a circular cross section formed in the workpiece.