JPH0615554A - Manufacture of ceramic ball - Google Patents
Manufacture of ceramic ballInfo
- Publication number
- JPH0615554A JPH0615554A JP4197697A JP19769792A JPH0615554A JP H0615554 A JPH0615554 A JP H0615554A JP 4197697 A JP4197697 A JP 4197697A JP 19769792 A JP19769792 A JP 19769792A JP H0615554 A JPH0615554 A JP H0615554A
- Authority
- JP
- Japan
- Prior art keywords
- ball
- molding
- balls
- sintering
- ceramic
- 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.)
- Pending
Links
Landscapes
- Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)
- Devices For Post-Treatments, Processing, Supply, Discharge, And Other Processes (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】この発明は、ハイブリッド軸受
や、オールセラミックス軸受等に使用されるセラミック
ス製ボールの製造方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing ceramic balls used for hybrid bearings, all-ceramic bearings and the like.
【０００２】[0002]
【従来の技術】従来、軸受用のセラミックス製ボールを
製造する場合、セラミックスの未焼結のボールすなわち
グリーンボールを形成し、これを焼結した後に研磨を行
っている。研磨が必要になるのは次の理由による。2. Description of the Related Art Conventionally, when manufacturing a ceramic ball for a bearing, an unsintered ceramic ball, that is, a green ball is formed, and is sintered after polishing. The reason why polishing is necessary is as follows.
【０００３】すなわち、グリーンボールを成形する方法
として、金型成形、射出成形、ＣＩＰ成形（冷間等方加
圧成形）等がある。図３（Ａ）は金型成形の過程を示
し、上下のパンチ３１，３２とダイス３３との間にセラ
ミックス粉末を充填してグリーンボールＢを加圧成形す
る。図４（Ａ）はＣＩＰ成形の過程を示し、上ゴム型３
５および下ゴム型３６からなるゴム型３７内にセラミッ
クス粉末を充填し、ゴム型３７を圧力容器（図示せず）
の液体内に浸してグリーンボールＢを加圧成形する。こ
れらの成形方法によると、成形後のボール形状を図３
（Ｂ）および図４（Ｂ）に各々示すように、いずれも型
合わせ面に凸部ａが生じる。そのため、これらの凸部ａ
の除去が必要であり、焼結後に研磨を施して真球に近い
形状に加工している。That is, as a method of molding a green ball, there are a die molding, an injection molding, a CIP molding (cold isotropic pressure molding) and the like. FIG. 3A shows a process of molding a die, in which ceramic powder is filled between the upper and lower punches 31 and 32 and the die 33 to press-mold the green ball B. FIG. 4A shows the process of CIP molding, in which the upper rubber mold 3
5 and the lower rubber mold 36 are filled with ceramic powder, and the rubber mold 37 is filled with a pressure container (not shown).
And the green ball B is pressure-molded. According to these molding methods, the ball shape after molding is shown in FIG.
As shown in FIGS. 4B and 4B, in each case, a convex portion a is formed on the mold matching surface. Therefore, these convex parts a
Are required to be removed, and polishing is performed after sintering to form a shape close to a true sphere.
【０００４】[0004]
【発明が解決しようとする課題】しかし、焼結したセラ
ミックス製ボールは硬度が非常に高く、またいずれの成
形方法によっても凸部ａが大きく生じて加工代が大きな
ものとなるため、加工時間が長くなる。しかも、大きな
凸部ａがあるために加工定盤の損耗が早いという問題点
がある。However, since the sintered ceramic balls have a very high hardness, and the convex portions a are largely generated by any of the molding methods, the machining allowance is large, so that the machining time is long. become longer. In addition, there is a problem that the work surface plate is quickly worn due to the large convex portion a.
【０００５】この発明の目的は、加工能率が良く、コス
ト低下が図れるセラミックス製ボールの製造方法を提供
することである。An object of the present invention is to provide a method of manufacturing a ceramic ball which has a high working efficiency and can reduce the cost.
【０００６】[0006]
【課題を解決するための手段】この発明のセラミックス
製ボールの製造方法は、グリーンボールを仮焼した状態
またはグリーンボールのままの状態で研磨し、成形時に
できる型合わせ面等の凸部を除去して真球に近い形状に
加工する方法である。前記の研磨は、多数個を加工定盤
間に装入して同時に行う。この研磨の後に焼結を行う。
仮焼は、焼結温度よりも低い温度で加熱することにより
行う。According to the method of manufacturing a ceramic ball of the present invention, a green ball is calcinated or ground as it is, and a convex portion such as a mating surface formed during molding is removed. Then, it is a method of processing into a shape close to a true sphere. The above-mentioned polishing is carried out at the same time by inserting a large number of them between the processing surface plates. After this polishing, sintering is performed.
The calcination is performed by heating at a temperature lower than the sintering temperature.
【０００７】[0007]
【作用】この方法によると、焼結前の状態でセラミック
ス製ボールを研磨し、成形時にできる型合わせ面等の凸
部を除去して真球に近い形状とするため、焼結後の仕上
加工代が少なくて済み、あるいは仕上加工が不要とな
る。焼結前の研磨は、ボールが柔らかな状態で行えるた
め、焼結後の研磨に比べて非常に高い能率で行え、また
加工定盤間で一度に多数個加工できる。仮焼したボール
は仮焼前のボールよりも若干強度は高くなるが、焼結し
たものに比べて格段に容易に研磨が行える。According to this method, the ceramic balls are ground in the state before sintering and the convex portions such as the mating surfaces formed during the molding are removed to form a shape close to a true sphere. The cost is low, or finishing work is unnecessary. Polishing before sintering can be performed with a very soft ball, so that it can be performed at a much higher efficiency than polishing after sintering, and a large number of balls can be machined at one time between machining surface plates. The calcined balls have a slightly higher strength than the balls before calcination, but they are much easier to polish than the sintered ones.
【０００８】[0008]
【実施例】この発明の一実施例を図１に基づいて説明す
る。まず、図１（Ａ）に示すように、グリーンボールＢ
を成形する。この成形は、図３または図４と共に前述し
た金型成形，ＣＩＰ成形，または射出成形等により行
う。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described with reference to FIG. First, as shown in FIG. 1 (A), the green ball B
To mold. This molding is performed by the mold molding, CIP molding, injection molding or the like described above with reference to FIG. 3 or FIG.
【０００９】このグリーンボールＢを、焼結温度よりも
低い温度で仮焼する（図１（Ｂ）。焼結温度はセラミッ
クス材料によって異なっており、例えば窒化けい素（Ｓ
ｉ3Ｎ4 系）では１７００〜２０００℃、炭化けい素
（ＳｉＣ系）では２０００〜２２００℃、酸化アルミニ
ウム（Ａｌ2 Ｏ3 系）では１５００℃前後である。した
がって仮焼の温度も材質によって異なり、グリーンボー
ルＢの材質に応じて焼結温度と常温との間の適宜の温度
で仮焼を行う。This green ball B is calcined at a temperature lower than the sintering temperature (FIG. 1 (B). The sintering temperature varies depending on the ceramic material, for example, silicon nitride (S
i 3 N 4 system) is 1700 to 2000 ° C., silicon carbide (SiC system) is 2000 to 2200 ° C., and aluminum oxide (Al 2 O 3 system) is around 1500 ° C. Therefore, the calcination temperature also differs depending on the material, and the calcination is performed at an appropriate temperature between the sintering temperature and room temperature depending on the material of the green ball B.
【００１０】このように仮焼を行ったボールＢを、図１
（Ｃ）に示すようにラップ盤１の上下の加工定盤２，３
間に多数個装入し、グリーンボールＢの成形時に生じる
型合わせ面等の凸部ａ（図１（Ａ））を除去して真球に
近い形状とする。なお、仮焼工程を省略してグリーンボ
ールＢの状態でラップ盤１による研磨を行っても良い。
上下の加工定盤２，３は、ボールＢを配置する円周溝を
対向面に有するものであり、少なくとも一方を回転駆動
する。両方を回転駆動する場合は、互いに逆方向に回転
させる。加工定盤２，３は、焼結状態のセラミックス製
ボールを研磨するものと同様な機構のものであるが、未
焼結のボールＢに用いるものでは、加工定盤２，３は軟
鋼製でも良い。焼結ボールの場合はダイヤモンド砥石が
使用される。研磨を行ったボールＢ′は、焼結を行い
（図１（Ｄ））、その後に仕上研磨を施して全工程が終
了する。Ball B thus calcined is shown in FIG.
As shown in (C), the processing surface plates 2 and 3 above and below the lapping machine 1
A large number of them are inserted in between, and the convex portion a (FIG. 1A) such as the mold matching surface generated during the molding of the green ball B is removed to form a shape close to a true sphere. The calcination step may be omitted and the green ball B may be ground by the lapping machine 1.
The upper and lower processing surface plates 2 and 3 have circumferential grooves in which balls B are arranged, on opposite surfaces, and at least one of them is rotationally driven. When both are driven to rotate, they are rotated in opposite directions. The processing surface plates 2 and 3 have the same mechanism as that for polishing the ceramic balls in the sintered state, but in the case of using the unsintered balls B, the processing surface plates 2 and 3 may be made of mild steel. good. In the case of a sintered ball, a diamond grindstone is used. The polished ball B ′ is sintered (FIG. 1 (D)) and then finish-polished to complete the whole process.
【００１１】この製造方法によると、焼結前の状態でセ
ラミックス製ボールＢを研磨し、グリーンボールＢの成
形時に生じる型合わせ面等の凸部ａを除去して真球に近
い形状とするため、焼結後の仕上加工代が少なくて済
み、あるいは仕上加工が不要となる。そのため加工時間
が短縮される。焼結前の研磨は、ボールＢが柔らかな状
態で行えるため、焼結後の研磨に比べて格段に高い能率
で加工でき、しかも加工定盤２，３間で一度に多数個加
工でき、したがって加工コストが低減する。According to this manufacturing method, the ceramic balls B are ground in the state before sintering, and the convex portions a such as the mold-matching surface generated during the molding of the green balls B are removed so that the green balls B have a shape close to a true sphere. The finishing processing cost after sintering is small, or the finishing processing is unnecessary. Therefore, the processing time is shortened. Since the ball B can be polished before sintering in a soft state, it can be machined with a significantly higher efficiency than polishing after sintering, and more than one can be machined between the processing surface plates 2 and 3 at a time. Processing cost is reduced.
【００１２】図２はセラミックスボールＢの焼結または
仮焼の程度と加工能率との関係を示すグラフである。横
軸に加熱処理温度を取り、縦軸に加工能率を対数目盛り
で示してある。同図は、セラミックスボールＢの材質と
して前記の窒化けい素（Ｓｉ3 Ｎ4 系）を用いた場合の
例である。同図から分かるように、焼結ボールに比べ
て、グリーンボールまたは仮焼ボールの場合は、飛躍的
に加工能率が高くなる。仮焼した場合は、仮焼前のボー
ルよりも若干強度は高くなるが、焼結したものに比べる
と研磨能率は桁違いに高い。仮焼した場合は、ボールＢ
の強度が強くなるために研磨時の取扱性が良い。FIG. 2 is a graph showing the relationship between the degree of sintering or calcination of the ceramic balls B and the working efficiency. The abscissa represents the heat treatment temperature, and the ordinate represents the processing efficiency on a logarithmic scale. The figure shows an example in which the above silicon nitride (Si 3 N 4 system) is used as the material of the ceramic balls B. As can be seen from the figure, in the case of the green ball or the calcined ball, the working efficiency is remarkably higher than that of the sintered ball. When calcined, the strength is slightly higher than that of the ball before calcining, but the polishing efficiency is orders of magnitude higher than that of the sintered one. Ball B if calcined
Since the strength of is strong, it is easy to handle during polishing.
【００１３】[0013]
【発明の効果】この発明のセラミックス製ボールの製造
方法は、焼結前の状態でセラミックス製ボールを研磨
し、成形時に生じる型合わせ面等の凸部を除去して真球
に近い形状とするため、焼結後の仕上加工代が少なくて
済み、あるいは仕上加工が不要となり、加工時間が短縮
される。焼結前の研磨は、ボールが柔らかな状態で行え
るために加工能率が格段に良く、また加工定盤間で一度
に多数個加工することができ、加工コストが低減され
る。また加工定盤の損耗も少ない。According to the method of manufacturing a ceramic ball of the present invention, the ceramic ball is ground in a state before sintering, and convex portions such as a mating surface generated during molding are removed to obtain a shape close to a true sphere. Therefore, the finishing processing cost after sintering is small, or the finishing processing is unnecessary, and the processing time is shortened. The polishing before sintering can be performed in a soft state of the balls, so that the processing efficiency is remarkably high, and a large number of pieces can be processed at one time between the processing surface plates, thus reducing the processing cost. Also, there is little wear on the processing surface plate.
【図１】この発明の一実施例の製造方法の工程説明図で
ある。FIG. 1 is a process explanatory view of a manufacturing method according to an embodiment of the present invention.
【図２】焼結または仮焼の程度と加工能率との関係を示
すグラフである。FIG. 2 is a graph showing the relationship between the degree of sintering or calcination and the working efficiency.
【図３】（Ａ），（Ｂ）は各々従来の金型成形法を示す
破断側面図および成形後のグリーンボールの側面図であ
る。3 (A) and 3 (B) are respectively a broken side view and a side view of a green ball after molding showing a conventional die molding method.
【図４】（Ａ），（Ｂ）は各々従来のＣＩＰ成形法を示
す破断側面図および成形後のグリーンボールの側面図で
ある。4 (A) and (B) are respectively a side view of a fracture and a side view of a green ball after molding showing a conventional CIP molding method.
１…ラップ盤、２，３…加工定盤、Ｂ…ボール、ａ…突
部1 ... Lapping machine, 2, 3 ... Processing surface plate, B ... Ball, a ... Projection
Claims (1)
る過程と、このグリーンボールを焼結温度よりも低い温
度に仮焼した状態または未加熱処理の状態で加工定盤間
に多数個装入し真球に近い形状に研磨する過程と、この
研磨されたボールを焼結する過程とを含むセラミックス
製ボールの製造方法。1. A process of forming a ceramic green ball, and a plurality of true spheres loaded into a working surface plate in a state where the green balls are calcined at a temperature lower than a sintering temperature or in an unheated state. A method of manufacturing a ceramic ball, which includes a step of polishing the ball into a shape close to the shape described above and a step of sintering the polished ball.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4197697A JPH0615554A (en) | 1992-06-30 | 1992-06-30 | Manufacture of ceramic ball |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4197697A JPH0615554A (en) | 1992-06-30 | 1992-06-30 | Manufacture of ceramic ball |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0615554A true JPH0615554A (en) | 1994-01-25 |
Family
ID=16378855
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4197697A Pending JPH0615554A (en) | 1992-06-30 | 1992-06-30 | Manufacture of ceramic ball |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0615554A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100400658B1 (en) * | 2000-10-26 | 2003-10-08 | 이부락 | the method foaming of ball ceramic |
| CN100464951C (en) * | 2007-05-15 | 2009-03-04 | 山东东阿钢球集团有限公司 | Technique for processing silicon fluoride ball in G3 grade |
| JP2010100461A (en) * | 2008-10-22 | 2010-05-06 | Olympus Corp | Spherical material and method of manufacturing the same |
| JP2016221585A (en) * | 2015-05-27 | 2016-12-28 | 株式会社ジェイテクト | Spherical body polishing device and truing-up method thereof |
-
1992
- 1992-06-30 JP JP4197697A patent/JPH0615554A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100400658B1 (en) * | 2000-10-26 | 2003-10-08 | 이부락 | the method foaming of ball ceramic |
| CN100464951C (en) * | 2007-05-15 | 2009-03-04 | 山东东阿钢球集团有限公司 | Technique for processing silicon fluoride ball in G3 grade |
| JP2010100461A (en) * | 2008-10-22 | 2010-05-06 | Olympus Corp | Spherical material and method of manufacturing the same |
| JP2016221585A (en) * | 2015-05-27 | 2016-12-28 | 株式会社ジェイテクト | Spherical body polishing device and truing-up method thereof |
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