JP2879178B2 - Ceramic push rod and method of manufacturing the same - Google Patents
Ceramic push rod and method of manufacturing the sameInfo
- Publication number
- JP2879178B2 JP2879178B2 JP10179492A JP10179492A JP2879178B2 JP 2879178 B2 JP2879178 B2 JP 2879178B2 JP 10179492 A JP10179492 A JP 10179492A JP 10179492 A JP10179492 A JP 10179492A JP 2879178 B2 JP2879178 B2 JP 2879178B2
- Authority
- JP
- Japan
- Prior art keywords
- push rod
- hole
- ceramic
- hanging tool
- firing
- 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 - Lifetime
Links
Landscapes
- Valve-Gear Or Valve Arrangements (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は、焼成後の切断加工を省
略すると共に、研磨加工を極力少なくしたエンジン用の
セラミックプッシュロッドおよびその製造方法に関する
ものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ceramic push rod for an engine in which cutting after firing is omitted and polishing is minimized, and a method of manufacturing the same.
【０００２】[0002]
【従来の技術】従来のセラミックプッシュロッドは、ロ
ッドの長さが径の約２０〜３０倍もある細長い形状のた
め、焼成時変形し易い。そこでその焼成変形を極力避け
るため、セラミック材を円柱状にプレス加工し、そのプ
レス加工したプッシュロッド２０に吊り具用孔２０ａを
穿設し、図４に示すように、吊り具用孔２０ａに吊り具
２１を嵌挿し、その吊り具２１を焼成炉のサヤ２２に引
っ掛けて吊り焼きし、その吊り具２１を抜くか、図７の
ように、吊り部２１ａを焼成炉のサヤに引っ掛けて吊り
焼きし、焼成後、図５に示すように、引っ掛け部分２３
を切断すると共に、図６に示すように、凹球面基部２４
を粗加工し、その後凹球面基部２４および凸球面基部２
５を研磨加工するようになっていた。2. Description of the Related Art A conventional ceramic push rod has an elongated shape in which the length of the rod is about 20 to 30 times its diameter, so that it is easily deformed during firing. Therefore, in order to avoid the firing deformation as much as possible, a ceramic material is pressed into a columnar shape, and a hole 20a for a hanging tool is formed in the pressed push rod 20, and as shown in FIG. The hanging tool 21 is inserted and hooked on the sheath 22 of the baking furnace and hung, and the hanging tool 21 is pulled out or, as shown in FIG. 7, the hanging part 21a is hooked on the sheath of the baking furnace. After baking and baking, as shown in FIG.
And, as shown in FIG.
, And then the concave spherical base 24 and the convex spherical base 2
5 was to be polished.
【０００３】[0003]
【発明が解決しようとする課題】ところが、この製造方
法は、プッシュロッド２０の吊り具用孔２０ａに吊り具
２１を嵌挿し、引っ掛け部分２３を切り捨てるため、引
っ掛け部分２３の分だけセラミック材料が余分にかかる
し、焼成後引っ掛け部分２３を切断すると共に、切断側
の端部に凹球面基部２４を研磨によって粗成形しなけれ
ばならないので、加工時間が多くかかり、コストアップ
を招いてしまう欠点があった。However, in this manufacturing method, since the hanging tool 21 is inserted into the hanging tool hole 20a of the push rod 20, and the hooked portion 23 is cut off, the ceramic material is extra by the amount of the hooked portion 23. In addition, since the hooked portion 23 must be cut after firing, and the concave spherical base 24 must be roughly formed by polishing at the end on the cut side, processing time is increased and the cost is increased. Was.
【０００４】そこで、本発明の課題は、セラミック材料
の節約、工程の省略および加工時間の短縮により、コス
ト低減を可能となすセラミックプッシュロッドおよびそ
の製造方法を提供することにある。It is an object of the present invention to provide a ceramic push rod and a method for manufacturing the same, which can reduce costs by saving ceramic materials, omitting steps and shortening processing time.
【０００５】[0005]
【課題を解決するための手段】上記課題を解決するため
に、本発明のセラミックプッシュロッドは、軸方向に三
等分した場合、中央部を除いた部分で、凸球面基部と凹
球面基部のいずれからも５ｍｍ以上離れた位置に、吊り
具用孔を単独で、且つ軸心と直交するよう貫設したもの
であり、又本発明の製造方法は、セラミック材を鋳込ん
で両端に球面基部を有するプッシュロッド形状をニアネ
ットシェイプ成形し、そのニアネットシェイプ成形した
プッシュロッドの少なくとも一方の端側部に吊り具用孔
を貫設し、その吊り具用孔に吊り具を嵌挿して前記プッ
シュロッドを吊り焼きし、焼成後両端の球面基部を研磨
加工するものである。In order to solve the above-mentioned problems, a ceramic push rod according to the present invention, when divided into three equal parts in the axial direction, has a convex spherical base and a concave spherical base at a portion excluding a central portion. At least 5 mm away from any of them, a hole for a hanging tool is provided independently and penetrating so as to be orthogonal to the axis, and the manufacturing method of the present invention is such that a ceramic material is cast and spherical bases are provided at both ends. A push rod shape having a near-net shape is formed, a hole for a hanging tool is penetrated through at least one end side of the push rod formed with the near-net shape, and the hanging tool is inserted into the hole for the hanging tool. The push rod is suspended and baked, and after firing, the spherical bases at both ends are polished.
【０００６】[0006]
【作用】吊り具用孔は、軸方向に三等分した場合、中央
部を除いた部分で、凹球面基部と凸球面基部のいずれか
らも５ｍｍ以上離れた位置に、単独で、且つ軸心と直交
するよう貫設されているので、剛性，強度および焼成変
形に悪影響を及ぼさない。又鋳込み成形により両端の球
面部をニアネットシェイプ成形したプッシュロッドに吊
り具用孔を貫設し、その吊り具用孔に吊り具を嵌挿し、
その吊り具を焼成炉のサヤに引っ掛けてプッシュロッド
を焼成し、焼成後その吊り具を取り外し、ニアネットシ
ェイプ成形した凹球面基部及び凸球面基部を研磨するだ
けで製品となるので、従来のように、引っ掛け部分を切
断したり、凹球面基部を研磨によって粗加工したりする
必要がなく、加工時間を短縮できコストを低減できる。When the hole for the hanging tool is divided into three equal parts in the axial direction, the hole excluding the central part is located at a distance of at least 5 mm from both the concave spherical base and the convex spherical base, and is independently and axially separated. Since it is penetrated so as to be perpendicular to, the rigidity, strength and firing deformation are not adversely affected. In addition, a hole for a hanging tool is provided through a push rod in which the spherical portions at both ends are formed in a near net shape by casting, and a hanging tool is inserted into the hole for the hanging tool,
The hanging tool is hooked on the sheath of the firing furnace to fire the push rod, and after firing, the hanging tool is removed, and the near-net-shaped concave spherical base and convex spherical base are simply polished to produce a product. In addition, there is no need to cut the hooked portion or rough-process the concave spherical base by polishing, so that the processing time can be shortened and the cost can be reduced.
【０００７】[0007]
【実施例】本発明に係るセラミックプッシュロッドの製
造方法の実施例を、図面に基づいて説明する。焼結窒化
珪素、ジルコニア等から成るセラミック材料を鋳込ん
で、図１示の如く、片端に凹球面基部１ａを、他端に凸
球面基部１ｂを有する細長いセラミックプッシュロッド
１をニアネットシェイプ成形する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a method for manufacturing a ceramic push rod according to the present invention will be described with reference to the drawings. As shown in FIG. 1, an elongated ceramic push rod 1 having a concave spherical base 1a at one end and a convex spherical base 1b at the other end is molded into a near net shape by casting a ceramic material made of sintered silicon nitride, zirconia, or the like. .
【０００８】そして、セラミックプッシュロッド１の剛
性，強度および焼成変形に悪影響を及ぼさぬように、吊
り具用孔２を次に述べる位置に穿設する。吊り具用孔は
できるかぎり基端側部に施すことが望ましく、少なくと
も全長を約三等分した場合、中央のＹ部分を除いたＸ及
びＺ部分のうちのＺ部分で、かつ凸球面基部１ｂから５
ｍｍ以上離れた位置に、吊り具用孔２を、単独で、且つ
軸心と直交するよう貫設する。そして、この吊り具用孔
２は、図２のように、全長を約三等分した場合、同じく
中央のＹ部分を除いたＸ及びＺ部分のうちのＸ部分で、
かつ凹球面基部１ａから５ｍｍ以上離れた位置に設けて
も良い。尚、全長を約三等分した場合、中央のＹ部分
は、使用時高い応力がかかり、また、焼成時、焼成炉の
サヤより上方に突出した部分に曲りが発生し易いので、
吊り具用孔２を設けることは避けた方が良い。A hole 2 for a hanging tool is formed at a position described below so that the rigidity, strength and firing deformation of the ceramic push rod 1 are not adversely affected. It is desirable that the hole for the hanging tool be formed on the base end side as much as possible. When the entire length is at least approximately equal to three, the Z part of the X and Z parts excluding the central Y part, and the convex spherical base part 1b From 5
At a position separated by not less than mm, the hole 2 for a hanging tool is penetrated independently and perpendicular to the axis. Then, as shown in FIG. 2, when the entire length is approximately divided into three equal parts, the hanging tool hole 2 is the X part of the X and Z parts excluding the central Y part,
Further, it may be provided at a position 5 mm or more away from the concave spherical base 1a. When the entire length is divided into approximately three equal parts, the central Y portion is subjected to a high stress during use, and, during firing, a portion protruding above the sheath of the firing furnace is likely to bend.
It is better to avoid providing the hole 2 for the hanging tool.
【０００９】上記のように形成したセラミックプッシュ
ロッド１の吊り具用孔２に、図３に示す如く、吊り具と
してのセラミックバー３を嵌挿し、このセラミックバー
３を焼成炉（図示省略）のサヤ４に引っ掛けてセラミッ
クプッシュロッド１を焼成し、焼成後そのセラミックバ
ー３を取り外し、ニアネットシェイプ成形した球面基部
１ａおよび凸球面１ｂを研磨すれば製品となる。As shown in FIG. 3, a ceramic bar 3 as a hanger is inserted into the hanger hole 2 of the ceramic push rod 1 formed as described above, and the ceramic bar 3 is inserted into a firing furnace (not shown). The ceramic push rod 1 is hooked to the sheath 4 and fired. After firing, the ceramic bar 3 is removed, and the spherical base 1a and the convex spherical surface 1b, which have been subjected to the near net shape molding, are polished to obtain a product.
【００１０】このように、セラミックプッシュロッド１
は、焼成後引っ掛け部分を切り捨てることがないので、
従来のセラミックプッシュロッドに比べ、その引っ掛け
部分だけセラミック材料を節約でき、また、従来の方法
に比べ、引っ掛け部分を切断したり、球面穴を研磨によ
って粗加工したりする工程が省略されるので、加工時間
を短縮できコストを低減でき、さらに、吊り具用孔を貫
設した分、軽量化することができる。[0010] Thus, the ceramic push rod 1
Does not cut off the hooked part after firing,
Compared with the conventional ceramic push rod, the ceramic material can be saved only in the hooked part, and the step of cutting the hooked part and roughing the spherical hole by polishing is omitted compared to the conventional method, The processing time can be shortened, the cost can be reduced, and the weight can be reduced by the through hole for the hanging tool.
【００１１】なお、上記実施例におけるセラミックプッ
シュロッドやセラミックバーの成形方法，形状および吊
り具用孔を設ける位置は一例であって、それに限定され
るものではなく、本発明の目的及び趣旨を逸脱しない範
囲において適宜変更できるものである。又、図８及び図
９に示すように、円筒端側部に段付部を設けても同様の
効果があるが、図８の突出した段付部２５は重量増とな
り動弁系部品としては好ましくなく、図９のような溝状
の段付部２６は、焼成収縮を見込んだ溝深さを設定しな
ければならず、また、収縮時にサヤ２２にセットした位
置よりずれる可能性もあるため、吊り部の径を外周円筒
部径より大幅に小さくしなければならず、外周円筒部径
がφ１０程度で設定されることの多いプッシュロッドで
は、溝を吊り部として設定することは好ましくない。吊
り部を孔として設計すれば、孔径に対し吊り具の径を選
択するだけで良くなる。The method and the shape of the ceramic push rod and the ceramic bar in the above embodiment and the position where the hole for the hanging tool is provided are merely examples, and the present invention is not limited thereto, and departs from the object and spirit of the present invention. It can be changed appropriately within a range not to be performed. As shown in FIGS. 8 and 9, the same effect can be obtained by providing a stepped portion on the cylindrical end side, but the protruded stepped portion 25 in FIG. Undesirably, the groove-shaped stepped portion 26 as shown in FIG. 9 must be set to a groove depth in consideration of firing shrinkage, and may be shifted from the position set in the sheath 22 during shrinkage. On the other hand, the diameter of the hanging portion must be significantly smaller than the diameter of the outer cylindrical portion, and in a push rod in which the outer cylindrical portion diameter is often set to about φ10, it is not preferable to set the groove as the hanging portion. If the hanging portion is designed as a hole, it is sufficient to select only the diameter of the hanging tool with respect to the hole diameter.
【００１２】[0012]
【発明の効果】以上説明したように、本発明に係るセラ
ミックプッシュロッドは、吊り具用孔が、軸方向に三等
分した場合、中央部を除いた部分で、凸球面基部と凹球
面基部のいずれからも５ｍｍ以上離れた位置に、単独
で、且つ軸心と直交するよう貫設されているので、吊り
具用孔が設けられている部分に高い応力がからないし、
吊り具用孔の分、軽量化される。又本発明の製造方法
は、両端に球面基部を有するプッシュロッド形状をニア
ネットシェイプ成形し、少なくとも一方の端側部に吊り
具用孔を穿設し、その吊り具用孔に吊り具を嵌挿して吊
り焼きし、焼成後は、両端の球面基部を研磨加工するだ
けであるから、セラミック材料を節約でき、また、従来
の方法に比べ、引っ掛け部分を切断したり、凹球面基部
を研磨によって粗加工したりする工程が省略され、加工
時間を大幅に短縮できコストを低減できる等、実用上優
れた効果を奏するものである。As described above, the ceramic push rod according to the present invention has a convex spherical base and a concave spherical base except for the central part when the hole for the hanging tool is divided into three equal parts in the axial direction. 5 mm or more from any of the above, since it is provided alone and penetrating perpendicular to the axis, high stress is not applied to the portion where the hole for the hanging tool is provided,
The weight is reduced by the amount of the hole for the hanging tool. Further, in the manufacturing method of the present invention, a push rod shape having spherical bases at both ends is formed in near net shape, a hole for a hanging tool is formed in at least one end side, and the hanging tool is fitted into the hole for the hanging tool. After inserting, hanging and baking, after firing, it is only necessary to grind the spherical base at both ends, so that ceramic material can be saved, and compared to the conventional method, the hooked part can be cut or the concave spherical base is polished. The step of performing rough processing is omitted, and a practically excellent effect is exhibited, for example, the processing time can be significantly reduced and the cost can be reduced.
【図１】本発明の実施例のセラミックプッシュロッドの
一形状の説明図である。FIG. 1 is an explanatory view of one shape of a ceramic push rod according to an embodiment of the present invention.
【図２】図１の吊り具用孔位置を変更したセラミックプ
ッシュロッドの説明図である。FIG. 2 is an explanatory view of a ceramic push rod in which a position of a hole for a hanging tool in FIG. 1 is changed.
【図３】セラミックプッシュロッドの焼成の状態の説明
図である。FIG. 3 is an explanatory view of a state of firing a ceramic push rod.
【図４】従来のセラミックプッシュロッドの焼成の状態
の説明図である。FIG. 4 is an explanatory view of a state of firing a conventional ceramic push rod.
【図５】従来のセラミックプッシュロッドの引っ掛け部
分を切断した状態の説明図である。FIG. 5 is an explanatory view showing a state in which a hook portion of a conventional ceramic push rod is cut.
【図６】従来のセラミックプッシュロッドにおいて焼成
後、凹球面基部を粗加工した状態の説明図である。FIG. 6 is an explanatory view showing a state in which a concave spherical base is roughly machined after firing in a conventional ceramic push rod.
【図７】従来のセラミックプッシュロッドの焼成の状態
の説明図である。FIG. 7 is an explanatory diagram of a state of firing a conventional ceramic push rod.
【図８】突出した段付部を有するセラミックプッシュロ
ッドの焼成の状態の説明図である。FIG. 8 is an explanatory diagram of a firing state of a ceramic push rod having a protruding stepped portion.
【図９】溝状の段付部を有するセラミックプッシュロッ
ドの焼成の状態の説明図である。FIG. 9 is an explanatory diagram of a firing state of a ceramic push rod having a groove-shaped stepped portion.
１・・セラミックプッシュロッド、１ａ・・凹球面基
部、１ｂ・・凸球面基部、２・・吊り具用孔、３・・セ
ラミックバー、４・・サヤ。1. Ceramic push rod, 1a .. concave spherical base, 1b .. convex spherical base, 2 .. hole for hanging tool, 3 .. ceramic bar, 4 ..
Claims (2)
た部分で、凹球面基部と凸球面基部のいずれからも５ｍ
ｍ以上離れた位置に、吊り具用孔を単独で、且つ軸心と
直交するよう貫設したセラミックプッシュロッド。1. When divided into three equal parts in the axial direction, a portion excluding the central portion is 5 m from both the concave spherical base and the convex spherical base.
A ceramic push rod in which a hole for a hanging tool is provided independently at a distance of m or more and perpendicularly to the axis.
を有するプッシュロッド形状をニアネットシェイプ成形
し、そのニアネットシェイプ成形したプッシュロッドの
少なくとも一方の端側部に吊り具用孔を貫設し、その吊
り具用孔に吊り具を嵌挿して前記プッシュロッドを吊り
焼きし、焼成後両端の球面基部を研磨加工する請求項１
記載のセラミックプッシュロッドの製造方法。2. A push rod shape having spherical bases at both ends is cast into a ceramic material to form a near-net shape, and at least one end side of the near-net-shaped push rod is provided with a hole for a hanging member. 2. The push rod is hung by inserting a hanger into the hanger hole, and after firing, the spherical bases at both ends are polished.
A method for manufacturing the ceramic push rod described in the above.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10179492A JP2879178B2 (en) | 1992-03-28 | 1992-03-28 | Ceramic push rod and method of manufacturing the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10179492A JP2879178B2 (en) | 1992-03-28 | 1992-03-28 | Ceramic push rod and method of manufacturing the same |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH05280310A JPH05280310A (en) | 1993-10-26 |
| JP2879178B2 true JP2879178B2 (en) | 1999-04-05 |
Family
ID=14310071
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10179492A Expired - Lifetime JP2879178B2 (en) | 1992-03-28 | 1992-03-28 | Ceramic push rod and method of manufacturing the same |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2879178B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6550280B1 (en) * | 1999-12-13 | 2003-04-22 | Agere Systems Guardian Corp. | Process of sintering a hanging silica tube so as to exhibit a low bow |
-
1992
- 1992-03-28 JP JP10179492A patent/JP2879178B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH05280310A (en) | 1993-10-26 |
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