JP2738758B2 - Manufacturing method of two-part bearing - Google Patents
Manufacturing method of two-part bearingInfo
- Publication number
- JP2738758B2 JP2738758B2 JP34047989A JP34047989A JP2738758B2 JP 2738758 B2 JP2738758 B2 JP 2738758B2 JP 34047989 A JP34047989 A JP 34047989A JP 34047989 A JP34047989 A JP 34047989A JP 2738758 B2 JP2738758 B2 JP 2738758B2
- Authority
- JP
- Japan
- Prior art keywords
- intermediate structure
- bearing
- ring
- cutter
- bearing intermediate
- 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
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は２分割型軸受の製造方法に関するものであ
り、詳細には、内燃機関や外燃機関のクランク軸や圧延
機のコネクティングロッド等の軸受装置として使用され
ている２分割型軌道輪の製造方法に関するものである。Description: TECHNICAL FIELD The present invention relates to a method for manufacturing a two-part bearing, and more particularly, to a method for manufacturing a crankshaft of an internal combustion engine or an external combustion engine, a connecting rod of a rolling mill, or the like. The present invention relates to a method of manufacturing a two-piece race used as a bearing device.
２分割型軸受の製造方法として自然割法が知られてい
る。この方法は、第２図に示すように焼入鋼の亀裂敏感
性を利用して、軌道輪（1a）（1b）を製造するものであ
って、リング状軸受中間構体（１）の外周面にカッタ
（２）で溝（３）（３）を形成し、この溝（３）（３）
内に楔（４）を打込むことによってリング状軸受中間構
体（１）に亀裂（５）を発生させ、２個１組の半円状の
軌道輪（1a）（1b）を製造するものである。The natural split method is known as a method for manufacturing a two-piece bearing. In this method, as shown in FIG. 2, the race rings (1a) and (1b) are manufactured using the crack sensitivity of hardened steel, and the outer peripheral surface of a ring-shaped bearing intermediate structure (1) is manufactured. The grooves (3) and (3) are formed with the cutter (2), and the grooves (3) and (3)
The ring-shaped bearing intermediate structure (1) is cracked (5) by driving a wedge (4) into the inside to produce a set of two semicircular races (1a) (1b). is there.
自然割法は、分割手段として焼入鋼の亀裂敏感性を利
用している関係上、２分割型軸受の材質と形状によって
は使用できない場合がある。例えば、軌道輪（1a）（1
b）が浸炭鋼から製造されている場合には、亀裂敏感値
が低いため、自然割法の採用は困難であり、また、軌道
輪（1a）（1b）の肉厚が大きい場合には、軌道輪（1a）
（1b）の内部迄焼きが入っていないため亀裂敏感値が低
くなり、自然割法の使用が困難となる。更に、軌道輪
（1a）または（1b）において、それぞれの肉厚差が大き
い場合、例えば第３図に示すような玉軸受（６）におい
て、内輪（７）の肉厚T1、T2が端部と中心部とで大幅に
相違しているような場合には、軸方向への亀裂の伸展が
望めないため、自然割法の使用は困難となる。The natural splitting method cannot be used depending on the material and shape of the two-split type bearing because the crack sensitivity of hardened steel is used as the splitting means. For example, the ring (1a) (1
When b) is made of carburized steel, it is difficult to adopt the natural splitting method because of its low crack sensitivity, and when the thickness of the races (1a) (1b) is large, Track ring (1a)
Since the inside of (1b) is not baked, the crack sensitivity value is low, and it is difficult to use the natural splitting method. Further, when the thickness difference between the races (1a) or (1b) is large, for example, in a ball bearing (6) as shown in FIG. 3, the thicknesses T 1 and T 2 of the inner race (7) are reduced. In the case where there is a great difference between the end and the center, it is difficult to use the natural splitting method because the extension of the crack in the axial direction cannot be expected.
２分割型軸受を自然割法によって製造する場合の材質
および形状による上記制約を取り除くため、第４図に示
すような半割り状態への旋削工程と熱処理工程とを組合
せた軸受製造方法が使用されている。In order to remove the above-mentioned restrictions due to the material and the shape when the two-split type bearing is manufactured by the natural splitting method, a bearing manufacturing method combining a turning process to a half split state and a heat treatment process as shown in FIG. 4 is used. ing.
ところが、この方法ではリング状の軸受中間構体を半
割り状態に旋削した後、２分割されたそれぞれの軌道輪
（1a）（1b）に熱処理を施しているため、第５図に斜線
付の矢印および二点鎖線で示すように熱処理時に軌道輪
（1a）（1b）に大きな熱変形が生じる。この結果、リン
グ状形態のまま軸受中間構体に熱処理を施した場合に比
較して仕上げ研削用の取代が大きくなる。特に、浸炭鋼
から軌道輪（1a）（1b）が形成されている場合には、上
記の熱変形が顕著なため、必要な硬化層（８）の深さを
確保することが困難となる。However, in this method, the ring-shaped bearing intermediate structure is turned into a half-split state, and then heat treatment is applied to each of the two orbital rings (1a) (1b). As shown by the two-dot chain line, large thermal deformation occurs in the bearing rings (1a) and (1b) during the heat treatment. As a result, the allowance for finish grinding is larger than when the heat treatment is performed on the bearing intermediate structure in the ring shape. In particular, when the races (1a) and (1b) are formed from carburized steel, the above-mentioned thermal deformation is remarkable, and it becomes difficult to secure a necessary depth of the hardened layer (8).
上記課題の解決手段として本発明は、鍛造によって形
成されたリング状の軸受中間構体に熱処理を施す工程
と、 前記リング状軸受中間構体のテンパー処理時に、長径
Ｄ＋Ｔ、短径Ｄなる楕円状の軸受中間構体（ここにＴは
カッタの刃幅）に変形させる楕円修正工程と、 前記軸受中間構体をＴなる刃幅寸法を具えたカッタに
よって短径に沿って切断し、半円状の横断面形状を具え
た２個１組の軌道輪に形成する工程と、 前記２個１組に切断された軌道輪の研削加工工程とか
らなる２分割型軸受の製造方法を提供するものである。As a means for solving the above-mentioned problems, the present invention provides a step of performing a heat treatment on a ring-shaped bearing intermediate structure formed by forging, and an elliptical bearing having a major axis D + T and a minor axis D at the time of tempering the ring-shaped bearing intermediate assembly. An ellipse correcting step of transforming the bearing intermediate structure into an intermediate structure (where T is the blade width of the cutter), and cutting the bearing intermediate structure along a minor axis by a cutter having a blade width dimension of T to form a semicircular cross-sectional shape. The present invention provides a method of manufacturing a two-piece bearing, comprising: a step of forming a set of two orbital rings provided with: and a step of grinding the orbital rings cut into sets of two.
カッタを利用して半円状の横断面形状を具えた２個１
組の軌道輪に切断する以前にリング状の軸受中間構体を
テンパー処理時に楕円修正治具を用い、長径方向に引り
出すことによって長径方向にカッタの刃幅分だけ楕円状
に変形させる。この後、楕円状に変形した軸受中間構体
を、前記の刃幅を持ったカッタで短径に沿って切断する
ことによって、切断端を突合せたとき横断面の形状が真
円となる２個１組の半円状の軌道輪を製造する。2 pieces with semicircular cross section using cutter
Before cutting into a pair of races, the ring-shaped bearing intermediate structure is pulled out in the major axis direction by using an elliptical correction jig during tempering, thereby being deformed in the major axis direction into an elliptical shape by the blade width of the cutter. Then, the elliptically deformed bearing intermediate structure is cut along the minor axis with a cutter having the above-mentioned blade width, so that when the cut ends are joined, the cross-sectional shape becomes a perfect circle. Manufacture sets of semi-circular races.
第１図Ａは本発明方法を説明する工程図、第１図Ｂは
その切断工程を示す軸受中間構体および軌道輪中間構体
の正面図である。FIG. 1A is a process diagram for explaining the method of the present invention, and FIG. 1B is a front view of a bearing intermediate structure and a raceway intermediate structure showing the cutting process.
尚、以下の記述において、従来技術を示す第２図乃至
第５図と同一の構成部材は同一の参照番号で表示し、重
複する事項に関しては説明を省略する。In the following description, the same components as those in FIGS. 2 to 5 showing the prior art are denoted by the same reference numerals, and the description of the same items will not be repeated.
以下、圧延機のコネクティングロッド（図示省略）の
軸受装置に使用される２分割型軌道輪（1a）（1b）を浸
炭鋼材から製造する具体例に基づいて本発明を説明す
る。Hereinafter, the present invention will be described based on a specific example in which the two-split raceways (1a) and (1b) used in a bearing device for a connecting rod (not shown) of a rolling mill are manufactured from a carburized steel material.
上記コネクティングロッドの直径寸法770mmに合わせ
て、浸炭加工可能な鋼材から鍛造によって平均内径約77
0mm、平均外径約1070mm、幅約300mmのリング状軸受中間
構体（１）を製造する。更に正確に説明すると、この軸
受中間構体（１）の最大内径は、後記カッタ（２）によ
り切断に備えて、第１図Ｂに示すようにコネクティング
ロッドの直径770mmよりもカッタ（２）の刃幅寸法Ｔ
（例えば3mm）だけ大径に設定する。上記リング状軸受
中間構体（１）に表面硬化用の熱処理（浸炭加工）を施
した後、この軸受中間構体（１）をリング形状のまま所
定温度に加熱して二次焼入を行う。次いで、テンパー処
理時にリング状軸受中間構体（１）にカッタ（２）の切
り込み位置から90°の位置で内側より修正治具にてこの
リング状軸受中間構体（１）を楕円状に変形させる（第
１図Ｃ、Ｄ）。この後、リング状軸受中間構体（１）を
幅1mmのカッタ（２）で短径方向で切断することによっ
て、半円状の横断面形状を具えた２個１組の軌道輪中間
構体（1a′）（1b′）を形成する。最後に、カッタ
（２）による切断面同士を突き合わせた状態にして軌道
輪中間構体（1a′）（1b′）の表面に仕上げ研削加工を
施す。これによって、真円形の横断面形状を具えた２分
割型の軌道輪（1a）（1b）が最終製品として製造され
る。According to the diameter of the connecting rod 770mm, the average inner diameter of about 77 by forging from carburizable steel
A ring-shaped bearing intermediate structure (1) having a diameter of 0 mm, an average outer diameter of about 1070 mm, and a width of about 300 mm is manufactured. More specifically, the maximum inner diameter of the bearing intermediate structure (1) is set to be smaller than the connecting rod diameter of 770 mm as shown in FIG. 1B in preparation for cutting by the cutter (2) described later. Width dimension T
(For example, 3 mm) is set to a large diameter. After subjecting the ring-shaped bearing intermediate structure (1) to heat treatment (carburizing) for surface hardening, the bearing intermediate structure (1) is heated to a predetermined temperature in a ring shape to perform secondary quenching. Next, at the time of tempering, the ring-shaped bearing intermediate structure (1) is deformed into an elliptical shape by a correction jig from the inside at a position 90 ° from the cutting position of the cutter (2) in the ring-shaped bearing intermediate structure (1) ( FIG. 1C, D). Thereafter, the ring-shaped bearing intermediate structure (1) is cut in the minor diameter direction with a cutter (2) having a width of 1 mm to thereby provide a set of two raceway intermediate structures (1a) having a semicircular cross-sectional shape. ') Form (1b'). Finally, the surfaces of the raceway intermediate structures (1a ') and (1b') are subjected to finish grinding with the cut surfaces of the cutter (2) abutting each other. As a result, a two-piece raceway (1a) (1b) having a true circular cross-sectional shape is manufactured as a final product.
尚、上記実施例では、テンパー処理時にリング状軸受
中間構体（１）に修正治具を使用して、楕円状に変形さ
せているが、製法として二次焼入直後の製品温度が高い
間に修正治具にて変形させる方法も採用することができ
る。In the above-described embodiment, the ring-shaped bearing intermediate structure (1) is deformed into an elliptical shape using a correction jig during the tempering process. A method of deforming with a correction jig can also be adopted.
リング状のまま軸受中間構体が熱処理されるため、熱
処理工程での変形が少なく、この分だけ仕上げ研削用の
取代を小さくすることができる。従って、加工工数の削
減が可能となる。特に、浸炭鋼から軌道輪を製作する場
合に、熱変形に伴う取代として大きな浸炭深さを見込む
必要がないため、熱処理工数の節減効果が大きくなる。Since the bearing intermediate structure is heat-treated in a ring shape, the deformation in the heat treatment process is small, and the allowance for finish grinding can be reduced accordingly. Therefore, the number of processing steps can be reduced. In particular, when manufacturing a bearing ring from carburized steel, it is not necessary to allow for a large carburizing depth as a margin for thermal deformation, so the effect of reducing the number of heat treatment steps is increased.
第１図Ａは本発明方法を説明する工程図、第１図Ｂはそ
の切断工程を示す軸受中間構体および駆動輪中間構体の
正面図、第１図Ｃは楕円修正工程を説明する工程図、第
１図Ｄは楕円修正工程を示す正面図、第２図は自然割法
の説明図、第３図は玉軸受の内輪の縦断面図、第４図は
従来方法の工程図、第５図は従来方法を使用した場合の
軌道輪の熱変形形態を説明する平面図である。 （１）……リング状軸受中間構体、（1a）（1b）……軌
道輪、（1a′）（1b′）……軌道輪中間構体、（２）…
…カッタ、（Ｔ）……カッタの刃幅。1A is a process diagram for explaining the method of the present invention, FIG. 1B is a front view of a bearing intermediate structure and a drive wheel intermediate structure showing the cutting process, FIG. 1C is a process diagram for explaining an elliptical correction process, FIG. 1D is a front view showing an ellipse correcting process, FIG. 2 is an explanatory view of a natural split method, FIG. 3 is a longitudinal sectional view of an inner ring of a ball bearing, FIG. FIG. 3 is a plan view illustrating a thermal deformation of a bearing ring when a conventional method is used. (1) ... ring-shaped bearing intermediate structure, (1a) (1b) ... raceway, (1a ') (1b') ... raceway intermediate structure, (2) ...
... cutter, (T) ... cutter blade width.
Claims (1)
間構体に熱処理を施す工程と、 前記リング状軸受中間構体のテンパー処理時に、長径Ｄ
＋Ｔ、短径Ｄなる楕円状の軸受中間構体（ここにＴはカ
ッタの刃幅）に変形させる楕円修正工程と、 前記軸受中間構体をＴなる刃幅寸法を具えたカッタによ
って短径に沿って切断し、半円状の横断面形状を具えた
２個１組の軌道輪に形成する工程と、 前記２個１組に切断された軌道輪の研削加工工程とから
なる２分割型軸受の製造方法。A step of subjecting a ring-shaped bearing intermediate structure formed by forging to a heat treatment;
An elliptical bearing intermediate structure (here, T is the blade width of the cutter) having an elliptical bearing having a + T and a minor axis D, and a cutter having a blade width dimension of the bearing intermediate structure along the minor axis. Production of a two-part bearing comprising a step of cutting and forming a set of two orbital rings having a semicircular cross-sectional shape, and a step of grinding the orbital rings cut into a set of two. Method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP34047989A JP2738758B2 (en) | 1989-12-29 | 1989-12-29 | Manufacturing method of two-part bearing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP34047989A JP2738758B2 (en) | 1989-12-29 | 1989-12-29 | Manufacturing method of two-part bearing |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03204412A JPH03204412A (en) | 1991-09-06 |
| JP2738758B2 true JP2738758B2 (en) | 1998-04-08 |
Family
ID=18337357
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP34047989A Expired - Fee Related JP2738758B2 (en) | 1989-12-29 | 1989-12-29 | Manufacturing method of two-part bearing |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2738758B2 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4901787B2 (en) * | 2008-03-06 | 2012-03-21 | Ｎｔｎ株式会社 | Machine split manufacturing method of split ring-shaped member |
| JP6191205B2 (en) * | 2013-04-05 | 2017-09-06 | 日本精工株式会社 | Outer ring split type rolling bearing and manufacturing method thereof |
| JP6511815B2 (en) * | 2015-01-08 | 2019-05-15 | 日本精工株式会社 | Manufacturing method of split type bearing ring |
| JP6511816B2 (en) * | 2015-01-08 | 2019-05-15 | 日本精工株式会社 | Manufacturing method of split type bearing ring |
-
1989
- 1989-12-29 JP JP34047989A patent/JP2738758B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH03204412A (en) | 1991-09-06 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |