JPH07190032A - Manufacture of ceramic bolt - Google Patents
Manufacture of ceramic boltInfo
- Publication number
- JPH07190032A JPH07190032A JP35487593A JP35487593A JPH07190032A JP H07190032 A JPH07190032 A JP H07190032A JP 35487593 A JP35487593 A JP 35487593A JP 35487593 A JP35487593 A JP 35487593A JP H07190032 A JPH07190032 A JP H07190032A
- Authority
- JP
- Japan
- Prior art keywords
- bolt
- ceramic
- nut
- bolt shaft
- screw
- 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
- 239000000919 ceramic Substances 0.000 title claims abstract description 19
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 14
- 238000000034 method Methods 0.000 claims abstract description 13
- 239000011148 porous material Substances 0.000 claims description 4
- 230000000149 penetrating effect Effects 0.000 claims 1
- 238000000465 moulding Methods 0.000 abstract description 10
- 238000003754 machining Methods 0.000 abstract description 9
- 239000000463 material Substances 0.000 abstract description 4
- 238000001746 injection moulding Methods 0.000 description 3
- 238000005245 sintering Methods 0.000 description 3
- 238000005266 casting Methods 0.000 description 2
- 229910010293 ceramic material Inorganic materials 0.000 description 2
- 229910052602 gypsum Inorganic materials 0.000 description 2
- 239000010440 gypsum Substances 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
Landscapes
- Devices For Post-Treatments, Processing, Supply, Discharge, And Other Processes (AREA)
Abstract
Description
【０００１】［産業上の利用分野］本発明は締結用のセ
ラミックス製ボルト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 a ceramic bolt for fastening.
【０００２】［従来の方法］従来はセラミックス製ボル
トは一般に金型を使用する射出成形法か石膏を使用する
鋳込み成形法により、そのねじ部も同時に一体成型で作
られてきた。 或は丸棒のマシナブルセラミックス材料
からボルトを機械で削り出して作られてきた。[Conventional Method] Conventionally, a bolt made of ceramics has generally been integrally formed with its screw portion by an injection molding method using a mold or a casting molding method using gypsum. Or, it has been made by machining a bolt from a machinable ceramic material of a round bar with a machine.
【０００３】［発明が解決しようとする課題］セラミッ
クスのなま素材を射出又は鋳込み成形により一定のサイ
ズのボルト成形品にしてから製品にするため高温で焼結
するとボルトの寸法が大巾に収縮する。予めこの収縮を
見込んで型の寸法を調節しておき、焼結後に機械加工で
修正して仕上げるにしても、外径、内径、長さは修正で
きても、ねじのピッチを修正することは不可能であり、
従って製品としてのボルトは締結相手のめねじを切った
部材やナットと正しいねじ嵌合を得られず、ねじ山がか
た当りをして、ねじ部が破損するか又は弱い締付け力し
か得られず、ねじがゆるみ易いと云うフアスナーとして
重大な欠点があった。[Problems to be Solved by the Invention] [0003] Bolts shrink significantly when sintered at a high temperature in order to produce a product from a ceramic raw material by injection or casting to make a bolt-formed product of a certain size and then to make a product. To do. Even if the outer diameter, inner diameter, and length can be corrected even if the dimensions of the die are adjusted in advance to allow for this shrinkage and the material is modified by machining after sintering to finish it, the pitch of the screw cannot be modified. Impossible,
Therefore, the bolt as a product cannot obtain a correct screw fitting with the member or nut that is a female thread of the fastening partner, and the screw thread hits the screw part, or the screw part is damaged or only a weak tightening force is obtained. However, it had a serious drawback as a fastener that the screws were easily loosened.
【０００４】また、製造コストの面からみると、射出成
形用の金型はボルトの各サイズと各長さ毎にそれぞれ高
価な金型代がかかるので、ボルトの少量生産には射出成
形法は不向きであった。In terms of manufacturing cost, an injection mold requires an expensive mold cost for each size and each length of the bolt, so that the injection molding method is used for small-volume production of bolts. It was unsuitable.
【０００５】鋳込み成型法は石こうの型代は安価であ
り、設備も簡単なものであるから、コストの面では有利
のようであるが、、ボルトのような小物部品の場合、作
業に手間がかかり、熟練と経験が必要な上に、生産効率
が悪いため、結局はコスト高につながった。 成形品に
歪みが発生し易く、ねじ部のばり取りも問題であった。The cast molding method is advantageous in terms of cost because the mold cost of gypsum is inexpensive and the equipment is simple. However, in the case of small parts such as bolts, the work is troublesome. It takes a lot of skill, experience, and poor production efficiency, which eventually leads to higher costs. Distortion is likely to occur in the molded product, and deburring of the screw part was also a problem.
【０００６】他方、マシナブルセラミックスを丸棒から
機械で削り出してボルトを作る方法は、ねじ部の精度上
の問題はないが、ねじのサイズが大きく、且つボルトの
長さが長くなればなるほど、非常に高価な材料を大巾に
除去することになり、不経済であるばかりでなく、超硬
工具の損耗も大きく、加工時間も長くなり、やはりコス
ト高になった。On the other hand, in the method of making a bolt by mechanically cutting a machinable ceramic from a round bar, there is no problem in accuracy of the threaded portion, but as the size of the screw becomes larger and the length of the bolt becomes longer, However, not only is it very economical to remove very expensive materials, it is uneconomical, the wear of the cemented carbide tool is large, the processing time is long, and the cost is high.
【０００７】［課題を解決するための手段］本発明で
は、ボルト頭部とボルト軸とを別個に作り、ねじと丸キ
ーを利用して六角ナット又は円筒ナットをボルト軸の一
端に固定してボルト頭部を形成させた。また、セラミッ
クスの除去量が僅少であるねじ部の創成は機械加工によ
った。[Means for Solving the Problems] In the present invention, the bolt head and the bolt shaft are separately formed, and a hexagon nut or a cylindrical nut is fixed to one end of the bolt shaft by using a screw and a round key. The bolt head was formed. In addition, the creation of the threaded portion where the amount of ceramics removed was small was by machining.
【０００８】［作用］本発明のボルトのねじ部は材料の
セラミックスを焼結させた後に機械加工で創成されるの
で、ねじ部が収縮して寸法精度が狂うことがなく、従っ
て常にねじの互換性が確保され、相手部材に適正な締付
け力を与えることができる。[Operation] Since the threaded portion of the bolt of the present invention is created by machining after sintering the ceramic material, the threaded portion does not shrink and the dimensional accuracy does not change, and therefore the thread is always compatible. As a result, the proper tightening force can be applied to the mating member.
【０００９】［実施例］以下に、実施例を図面を参照し
ながら説明する。図１と図２は本発明の一実施例におけ
る平面図と縦断面図を、それぞれ示す。所要の長さと外
径を有するセラミックス製の丸棒をプレス成形法、又は
射出成形法、又は鋳込み成型法などにより、或はまたマ
シナブルセラミックスのブロックや丸棒から削り出す方
法により作り、その両端にねじ部１とねじ部２を機械で
おねじを切って設け、ボルト軸３を用意する。次に、上
記の各種成形法のいずれかにより、所要の六角外形、内
径、高さを有するセラミックス製の中空六角形の成形品
を焼成し、その内径にめねじを機械加工で創成して六角
ナット４を用意する。[Embodiment] An embodiment will be described below with reference to the drawings. 1 and 2 are a plan view and a vertical sectional view, respectively, in an embodiment of the present invention. A round bar made of ceramics with the required length and outer diameter is made by press molding, injection molding, cast molding, etc., or is also machined from a machinable ceramic block or round bar, and its both ends A threaded portion 1 and a threaded portion 2 are machined to form a male thread, and a bolt shaft 3 is prepared. Then, by any of the above-mentioned various molding methods, a ceramic hollow hexagonal molded product having the required hexagonal outer shape, inner diameter, and height is fired, and a female screw is machined to the inner diameter to create a hexagonal shape. Prepare the nut 4.
【００１０】六角ナット４をねじ部１にきつく締め込ん
でから細孔５を穿ち、これにセラミックス製の平行ピン
を丸キー６としてきつく打ち込んで六角ナット４をボル
ト軸３の上端に固定してボルト頭部を形成する。 この
時、六角ナット４の上面がボルト軸３の上面とほぼ同じ
位置にくるように、予めねじ部１の長さを設定してお
く。After tightening the hexagon nut 4 tightly on the threaded portion 1 and making the pore 5, the parallel pin made of ceramics is tightly driven as the round key 6 to fix the hexagon nut 4 to the upper end of the bolt shaft 3. Form the bolt head. At this time, the length of the screw portion 1 is set in advance so that the upper surface of the hexagon nut 4 is located at substantially the same position as the upper surface of the bolt shaft 3.
【００１１】丸キー６が使用条件などにより脱落の恐れ
がある場合はテーパーピンを使用し、細孔５もテーパー
孔とする。或は平行ピンを耐熱接着剤で細孔５に固着さ
せる。If the round key 6 is likely to fall off due to the conditions of use, a tapered pin is used, and the fine hole 5 is also a tapered hole. Alternatively, the parallel pins are fixed to the pores 5 with a heat resistant adhesive.
【００１２】図３と図４は本発明の別の一実施例におけ
る平面図と縦断面図を、それぞれ示す。上述の各種成形
法のいずれかにより、所要の外径、内径、高さ及び平行
なる平坦面７を有する中空円筒形の成形品を焼成し、そ
の内径に機械加工でめねじを創成した円筒ナット８を用
意する。 或は、マシナブルセラミックスのブロック又
は丸捧より機械加工で削り出して円筒ナット８を作って
もよい。前実施例の場合と同様の方法でボルト軸３を用
意し、そのねじ部１に円筒ナット８を、上記の方法でボ
ルト軸３の上端に固定する。3 and 4 are a plan view and a vertical sectional view, respectively, showing another embodiment of the present invention. A cylindrical nut in which a hollow cylindrical molded product having a required outer diameter, inner diameter, height and parallel flat surface 7 is fired by any of the various molding methods described above, and a female screw is created in the inner diameter by machining. Prepare 8. Alternatively, the cylindrical nut 8 may be made by machining a block of machinable ceramics or a round sword by machining. The bolt shaft 3 is prepared by the same method as in the previous embodiment, and the cylindrical nut 8 is fixed to the threaded portion 1 of the bolt shaft 3 by the above-mentioned method.
【００１３】また、ボルト軸３の上面中央にすり割り９
を予め設けておけば、平坦部７によるスパナ駆動の他
に、ドライバー駆動ができるので締結作業のスペースが
狭い時に便利である。 この場合はボルト軸３の上面の
位置を図４に示すように円筒ナット８の上面より僅かに
低くした方がドライバーをすり割り９に差し込むのが容
易になる。A slot 9 is formed in the center of the upper surface of the bolt shaft 3.
If the above is provided in advance, the driver can be driven in addition to the spanner driven by the flat portion 7, which is convenient when the space for fastening work is narrow. In this case, if the position of the upper surface of the bolt shaft 3 is made slightly lower than the upper surface of the cylindrical nut 8 as shown in FIG. 4, it becomes easier to insert the driver into the slit 9.
【００１４】［発明の効果］本発明ではねじ部は凡て機
械加工で創成し且つボルト頭部とボルト軸とを別個の部
品として作り、この二つをねじと丸キーで一体にアセン
ブリーしてボルトを製造する方法を採っているので、ね
じ部を設ける前の各部品はシンプルな形状をしており、
またそれらの断面形状も一様であるため、セラミックス
の成形及び焼結の過程で歪みが生じにくく、密度も均一
になるので収縮も均等で、且つ比較的小さい。ねじ部の
ねじ山やピッチは材料の収縮後に創成されるので高精度
の寸法が得られ、本発明のボルトは他のねじとの互換性
もあり、信頼性のある締め付け力を発揮し得る。[Effects of the Invention] In the present invention, the screw portion is created by machining and the bolt head and the bolt shaft are made as separate parts, and these two are integrally assembled with the screw and the round key. Since the method of manufacturing the bolt is adopted, each part before the threaded part has a simple shape,
Further, since their cross-sectional shapes are uniform, distortion is unlikely to occur during the molding and sintering of ceramics, and the density is uniform, so that the shrinkage is uniform and relatively small. Since the threads and pitch of the threaded portion are created after contraction of the material, high-accuracy dimensions can be obtained, and the bolt of the present invention is compatible with other threads and can exhibit reliable tightening force.
【００１５】更に、ねじ部を設ける前の各部品の成形形
状がシンプルで断面形状が一様であるため、金型代もそ
れだけ安くなる上に、生産効率のよい乾式プレス成形法
を採用することができるので生産コストの低減がはかれ
る。また、本発明でボルト頭部を形成した六角ナット４
及び円筒ナット８はそのまま、本ボルトや他のボルトと
セットにして締結する際の通常のナットとしても使用で
きるので、同じ金型の有効利用につながり、生産コスト
上、有利である。Further, since the molding shape of each part before the screw part is provided is simple and the cross-sectional shape is uniform, the die cost is reduced by that much, and the dry press molding method with good production efficiency is adopted. Therefore, the production cost can be reduced. In addition, the hexagonal nut 4 in which the bolt head is formed in the present invention
Since the cylindrical nut 8 can be used as it is as a normal nut when it is fastened as a set with the present bolt or another bolt, it leads to effective use of the same mold, which is advantageous in terms of production cost.
【図１】六角ナットをボルト頭部として形成させた、本
発明の一実施例の平面図である。FIG. 1 is a plan view of an embodiment of the present invention in which a hexagon nut is formed as a bolt head.
【図２】同上の中央縦断面図である。FIG. 2 is a central longitudinal sectional view of the above.
【図３】円筒ナットをボルト頭部として形成させた、本
発明の別の一実施例の平面図である。FIG. 3 is a plan view of another embodiment of the present invention in which a cylindrical nut is formed as a bolt head.
【図４】同上の中央縦断面図である。FIG. 4 is a central longitudinal sectional view of the above.
１．．ねじ部 ２．．ねじ部
３．．ボルト軸 ４．．六角ナット ５．．細孔
６．．丸キー ７．．平坦面 ８．．円筒ナット
９．．すり割り1. ． Screw part 2. ． Screw part
3. ． Bolt shaft 4. ． Hexagon nut 5. ． pore
6. ． Round key 7. ． Flat surface 8. ． Cylindrical nut
9. ． Slotting
─────────────────────────────────────────────────────
─────────────────────────────────────────────────── ───
【手続補正書】[Procedure amendment]
【提出日】平成６年３月１６日[Submission date] March 16, 1994
【手続補正１】[Procedure Amendment 1]
【補正対象書類名】明細書[Document name to be amended] Statement
【補正対象項目名】特許請求の範囲[Name of item to be amended] Claims
【補正方法】変更[Correction method] Change
【補正内容】[Correction content]
【特許請求の範囲】[Claims]
Claims (2)
丸棒の両端部に機械加工によりおねじを切ってねじ部を
設けてボルト軸とし、その一方のねじ部に同じく機械加
工によりめねじを切ったセラミックス製の六角ナットを
きつく締め込む。 この時、六角ナットの上面がボルト
軸の上面とほぼ同じ位置に固着するように、上記のねじ
部の長さを予め設定しておく。更にこの状態で嵌合して
いる両方のねじ山をたてに貫通する細孔を穿つ。 この
細孔にセラミックス製のピンを丸キーとしてきつく打ち
込んで六角ナットをボルト軸の一端に固定して、ボルト
頭部を形成させたことを特徴とする、セラミックス製ボ
ルトの製造方法。1. A ceramic round bar cut to a required length is machined to form a male thread at both ends to provide a threaded portion to form a bolt shaft, and one threaded portion is also machined to form a female thread. Tighten the cut ceramic hexagon nut. At this time, the length of the above-mentioned screw portion is set in advance so that the upper surface of the hexagonal nut is fixed at substantially the same position as the upper surface of the bolt shaft. Further, in this state, a hole penetrating vertically both screw threads that are fitted is formed. A method for manufacturing a ceramic bolt, characterized in that a ceramic pin is tightly driven into the pore with a round key to fix a hexagon nut to one end of a bolt shaft to form a bolt head.
械加工によりめねじを切った内径と側面に平行な２つの
平坦面を有する円筒ナットを使用した、請求項１記載の
セラミックス製ボルトの製造方法。2. The production of a ceramic bolt according to claim 1, wherein instead of the hexagon nut, a cylindrical nut having an inner diameter and a flat surface parallel to the side surface, which is also machined to form an internal thread, is used. Method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP35487593A JPH07190032A (en) | 1993-12-27 | 1993-12-27 | Manufacture of ceramic bolt |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP35487593A JPH07190032A (en) | 1993-12-27 | 1993-12-27 | Manufacture of ceramic bolt |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH07190032A true JPH07190032A (en) | 1995-07-28 |
Family
ID=18440497
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP35487593A Pending JPH07190032A (en) | 1993-12-27 | 1993-12-27 | Manufacture of ceramic bolt |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07190032A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100432164B1 (en) * | 2001-04-19 | 2004-05-17 | 이부락 | a method processing and supersonic method adult form of nut and bolt ceramic |
| JP2007120626A (en) * | 2005-10-28 | 2007-05-17 | Meidensha Corp | Ceramic bolt manufacturing method and ceramic bolt |
| JP2007120625A (en) * | 2005-10-28 | 2007-05-17 | Meidensha Corp | Ceramic bolt manufacturing method and ceramic bolt |
| US20120286440A1 (en) * | 2007-03-16 | 2012-11-15 | Wan Young Jang | Dental prosthesis and manufacturing method thereof |
-
1993
- 1993-12-27 JP JP35487593A patent/JPH07190032A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100432164B1 (en) * | 2001-04-19 | 2004-05-17 | 이부락 | a method processing and supersonic method adult form of nut and bolt ceramic |
| JP2007120626A (en) * | 2005-10-28 | 2007-05-17 | Meidensha Corp | Ceramic bolt manufacturing method and ceramic bolt |
| JP2007120625A (en) * | 2005-10-28 | 2007-05-17 | Meidensha Corp | Ceramic bolt manufacturing method and ceramic bolt |
| US20120286440A1 (en) * | 2007-03-16 | 2012-11-15 | Wan Young Jang | Dental prosthesis and manufacturing method thereof |
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