JPS6030964Y2 - Plug for piercing rolling - Google Patents
Plug for piercing rollingInfo
- Publication number
- JPS6030964Y2 JPS6030964Y2 JP2567581U JP2567581U JPS6030964Y2 JP S6030964 Y2 JPS6030964 Y2 JP S6030964Y2 JP 2567581 U JP2567581 U JP 2567581U JP 2567581 U JP2567581 U JP 2567581U JP S6030964 Y2 JPS6030964 Y2 JP S6030964Y2
- Authority
- JP
- Japan
- Prior art keywords
- plug
- piercing
- rolling
- piercing rolling
- thermal stress
- 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
Links
Landscapes
- Reduction Rolling/Reduction Stand/Operation Of Reduction Machine (AREA)
Description
【考案の詳細な説明】
本考案は金属熱ブルームを穿孔又は圧延する際に用いる
プラグに関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a plug used when drilling or rolling metal thermal blooms.
従来、例えばシームレス鋼管の製造用穿孔圧延プラグと
して耐熱合金が用いられ、種々の改善が重ねられてきた
が、なお一層の寿命向上が望まれている。Conventionally, heat-resistant alloys have been used as punch-rolled plugs for producing seamless steel pipes, and various improvements have been made, but there is a desire for further improvement in service life.
本考案は耐熱合金より耐熱性の優れているセラミックを
熱間工具材料として実用化することも目的とする。Another purpose of the present invention is to put ceramic, which has better heat resistance than heat-resistant alloys, into practical use as a hot tool material.
セラミックは一般に熱衝撃、熱応力に対して弱く、シー
ムレス鋼管製造用穿孔圧延用プラグの様な急激な温度変
化を生じる部分に用いると熱応力により破壊する。Ceramics are generally weak against thermal shock and thermal stress, and will break due to thermal stress if used in parts where rapid temperature changes occur, such as plugs for piercing and rolling in the production of seamless steel pipes.
考案者らは種々の実験の結果、セラミック製穿孔圧延用
プラグが熱応力により破壊する位置の周辺にあらかじめ
これを長さ方向に分割しておき、該境界によって熱応力
を緩和することにより割れを防止できることを確認した
。As a result of various experiments, the inventors found that by dividing the ceramic piercing-rolling plug in the length direction in advance around the location where it would break due to thermal stress, the cracks could be prevented by relaxing the thermal stress using the boundaries. We confirmed that it can be prevented.
セラミック製穿孔圧延用プラグの分割数は、穿孔圧延機
のタイプおよびプラグの寸法により適宜選定することが
できる。The number of divisions of the ceramic piercing-rolling plug can be appropriately selected depending on the type of piercing-rolling mill and the dimensions of the plug.
その分割位置はプラグ表面の最大受熱部を避け、最も熱
勾配の大きな位置とするのが好ましい。It is preferable that the dividing position avoids the maximum heat-receiving part of the plug surface and is set at a position where the thermal gradient is the largest.
また境界部は適宜接着剤により接合することができる。Further, the boundary portion can be appropriately joined with an adhesive.
表１に実機の３分の１規模のプレスロール穿孔機による
実施例を示す。Table 1 shows an example using a press roll punching machine that is one-third the scale of the actual machine.
プラグの形状はすべて第１図に示す通りで、１，２．３
の部分に分割された直径６５ｍのプラグを３００℃に予
熱して使用した。All plug shapes are as shown in Figure 1, 1, 2.3
A plug with a diameter of 65 m divided into sections was preheated to 300°C and used.
プラグは図の右端部がマンドレルと嵌合して支持され圧
延素材は低炭素キルド鋼で、１１３ｍｍ角の長さ１２０
−の素材を用い、これを１２５０℃に加熱したのち、プ
レスロール穿孔機によリ一工程で外径１３１斜、内径６
５順、長さ１５０−の円管に穿孔した。The right end of the plug fits into the mandrel and is supported, and the rolled material is low carbon killed steel and is 113 mm square with a length of 120 mm.
- After heating it to 1250℃, it is passed through a press roll punching machine with an outer diameter of 131 and an inner diameter of 6.
A circular tube with a length of 150 mm was perforated in 5 order.
一体プラグでは１本の穿孔ですべて割れを発生し、割れ
部が脱落し再使用不能となったが、本考案ではすべて３
分割した例であるが、割れが発生しないか、又は割れが
発生しても脱落するには至らず、再使用が可能であり、
例１では２４回以上、例２、例３では６（２）使用後も
再使用可能の状態であった。With the one-piece plug, all cracks occurred with one hole, and the cracked part fell off, making it impossible to reuse, but with this invention, all three
This is an example of splitting, but there is no cracking, or even if cracking occurs, it does not fall off, and it is possible to reuse it.
It remained reusable after 24 or more uses in Example 1, and 6 (2) times in Examples 2 and 3.
以上の如く本考案の穿孔圧延用プラグの実用的効果は顕
著である。As described above, the practical effects of the plug for piercing and rolling of the present invention are remarkable.
第１図は本考案の穿孔圧延用プラグの側面図である。 FIG. 1 is a side view of the piercing-rolling plug of the present invention.
Claims (1)
れた穿孔圧延用プラグ。A plug for piercing and rolling made of ceramic whose practical part is divided in the length direction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2567581U JPS6030964Y2 (en) | 1981-02-25 | 1981-02-25 | Plug for piercing rolling |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2567581U JPS6030964Y2 (en) | 1981-02-25 | 1981-02-25 | Plug for piercing rolling |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS57141804U JPS57141804U (en) | 1982-09-06 |
| JPS6030964Y2 true JPS6030964Y2 (en) | 1985-09-17 |
Family
ID=29823370
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2567581U Expired JPS6030964Y2 (en) | 1981-02-25 | 1981-02-25 | Plug for piercing rolling |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6030964Y2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1998029204A1 (en) * | 1996-12-27 | 1998-07-09 | Kawasaki Steel Corporation | Plug and mandrel bar for rolling of seamless steel pipe and method of manufacturing seamless steel pipe |
-
1981
- 1981-02-25 JP JP2567581U patent/JPS6030964Y2/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1998029204A1 (en) * | 1996-12-27 | 1998-07-09 | Kawasaki Steel Corporation | Plug and mandrel bar for rolling of seamless steel pipe and method of manufacturing seamless steel pipe |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS57141804U (en) | 1982-09-06 |
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