JPH025485B2 - - Google Patents
Info
- Publication number
- JPH025485B2 JPH025485B2 JP20131385A JP20131385A JPH025485B2 JP H025485 B2 JPH025485 B2 JP H025485B2 JP 20131385 A JP20131385 A JP 20131385A JP 20131385 A JP20131385 A JP 20131385A JP H025485 B2 JPH025485 B2 JP H025485B2
- Authority
- JP
- Japan
- Prior art keywords
- billet
- mandrel
- composite
- plug
- extrusion
- 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
- 239000002131 composite material Substances 0.000 claims description 46
- 238000001125 extrusion Methods 0.000 claims description 22
- 238000000886 hydrostatic extrusion Methods 0.000 claims description 8
- 239000000463 material Substances 0.000 claims description 6
- 238000003780 insertion Methods 0.000 claims description 3
- 230000037431 insertion Effects 0.000 claims description 3
- 239000002184 metal Substances 0.000 claims description 2
- 239000011247 coating layer Substances 0.000 description 7
- 229910045601 alloy Inorganic materials 0.000 description 4
- 239000000956 alloy Substances 0.000 description 4
- 238000005219 brazing Methods 0.000 description 4
- 239000011248 coating agent Substances 0.000 description 4
- 238000000576 coating method Methods 0.000 description 4
- 239000004359 castor oil Substances 0.000 description 3
- 235000019438 castor oil Nutrition 0.000 description 3
- ZEMPKEQAKRGZGQ-XOQCFJPHSA-N glycerol triricinoleate Natural products CCCCCC[C@@H](O)CC=CCCCCCCCC(=O)OC[C@@H](COC(=O)CCCCCCCC=CC[C@@H](O)CCCCCC)OC(=O)CCCCCCCC=CC[C@H](O)CCCCCC ZEMPKEQAKRGZGQ-XOQCFJPHSA-N 0.000 description 3
- 229910001315 Tool steel Inorganic materials 0.000 description 2
- 229910001093 Zr alloy Inorganic materials 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- 239000011162 core material Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000010409 ironing Methods 0.000 description 2
- 239000010410 layer Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 239000002345 surface coating layer Substances 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000002905 metal composite material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
Landscapes
- Extrusion Of Metal (AREA)
Description
【発明の詳細な説明】
［産業上の利用分野］
この発明は内面被覆複合管の静水圧押出し用複
合ビレツトに関するものである。DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] This invention relates to a composite billet for hydrostatic extrusion of internally coated composite pipes.
［従来の技術及び発明が解決しようとする問題
点］
従来、第３図に示すような内面に被覆層７を有
する金属複合管を静水圧押出し法により製造する
場合、押出しビレツトとしては断面構成が製品と
略同じ複合ビレツトを作成しているが、押出し開
始の際に油等の圧力媒体が複合ビレツトの孔とマ
ンドレルとの間隙から流出して押出し不能に陥る
ことを防止するため、第２図に示すように複合ビ
レツトの先端部１１の外径を本体部１２の外径よ
り小さくすると同時にマンドレル５の径よりも若
干小さくして仕上げ、マンドレル５を挿入する際
にいわゆる「締りばめ」の状態をもつてシールす
るように嵌合するようにしていた。[Prior art and problems to be solved by the invention] Conventionally, when manufacturing a metal composite pipe having a coating layer 7 on the inner surface as shown in FIG. A composite billet that is almost the same as the product is made, but in order to prevent pressure media such as oil from flowing out from the gap between the holes in the composite billet and the mandrel at the start of extrusion, making extrusion impossible, the billet shown in Figure 2 is used. As shown in the figure, the outer diameter of the tip 11 of the composite billet is made smaller than the outer diameter of the main body 12 and at the same time slightly smaller than the diameter of the mandrel 5. When inserting the mandrel 5, a so-called "interference fit" is achieved. They were designed to fit together to form a seal.
しかるに、複合ビレツトの被覆用パイプ２が硬
質でも薄い場合あるいは軟質である場合には、マ
ンドレル５挿入の際に硬質のマンドレル５によつ
てビレツト先端の縮径部の被覆用パイプ２が局部
的なしごき加工を受けて破断ないしは亀裂が生ず
ることが多い。こうして被覆用パイプ２が破断す
ると、圧力媒体がその部分から流出して押出し不
能となるのみならず、再び被覆用パイプ２の加工
を行わなければならず、その経済的損失は極めて
大きい。そこで、かねてよりマンドレル５挿入の
際に被覆用パイプ２を損傷することなく、しかも
押出し開始の際にビレツト先端部１１とマンドレ
ル５間の圧力媒体に対するシールが十分に達成さ
れるように、複合ビレツトの構造を改善すること
が望まれていた。 However, if the covering pipe 2 of the composite billet is hard but thin or soft, the hard mandrel 5 may cause the covering pipe 2 at the reduced diameter part at the tip of the billet to be partially damaged when inserting the mandrel 5. Breaks or cracks often occur during ironing. When the covering pipe 2 is broken in this way, not only does the pressure medium flow out from that part and extrusion becomes impossible, but also the covering pipe 2 has to be processed again, resulting in an extremely large economic loss. Therefore, we have developed a composite billet for some time in order to avoid damaging the covering pipe 2 when inserting the mandrel 5 and to ensure a sufficient seal against the pressure medium between the billet tip 11 and the mandrel 5 at the start of extrusion. It was desired to improve the structure of
なお、第２図において、マンドレル５の後端部
に一体に存するストツパ４は、複合ビレツトの後
端面に当接した状態で押出中はマンドレルと共に
押出し用ダイスに向つて移動するものである。 In FIG. 2, a stopper 4 integrally provided at the rear end of the mandrel 5 moves toward the extrusion die together with the mandrel during extrusion while being in contact with the rear end surface of the composite billet.
したがつて、この発明の目的とするところは、
前記した従来技術の欠点を解消し、複合ビレツト
とマンドレル間で圧力媒体の漏れを生ずることな
く押出し開始の可能な複合ビレツト構造を提供す
ることにある。 Therefore, the purpose of this invention is to
The object of the present invention is to solve the above-mentioned drawbacks of the prior art and to provide a composite billet structure in which extrusion can be started without leakage of pressure medium between the composite billet and the mandrel.
この発明において、内面被覆用パイプの材質に
ついては、従来法であればマンドレルと同程度に
硬質のものでも薄ければ損傷を起すことから、特
に硬軟の材質を問わないものである。 In this invention, the material of the inner-coating pipe does not particularly matter, since in the conventional method, even if it is as hard as the mandrel, it will be damaged if it is thin.
なお、静水圧押出し法による複合管の製造に関
する従来例としては特開昭47−31862号があるが、
これは圧力媒体がビレツトのケースと中空芯との
間に流入するのを防止し、かつダイスの出口から
漏れるのを防止したものであり、マンドレル挿入
の際の被覆用パイプの損傷を防止することを目的
としたものではない。その他、ビレツトの静水圧
押出し技術に関する従来例として特開昭48−
55167号、同49−63641号、同57−11719号等が知
られているが、これらはいずれも単一材、又は芯
材の外側に被覆材を設けてなる複合材から成るビ
レツトの押出し加工に関するものであつて、マン
ドレルを使用する内面被覆複合管用の複合ビレツ
トを対象としたものではない。 In addition, as a conventional example of manufacturing composite pipes using the hydrostatic extrusion method, there is Japanese Patent Application Laid-Open No. 47-31862.
This prevents the pressure medium from flowing between the billet case and the hollow core, and also prevents it from leaking from the outlet of the die, and prevents damage to the covering pipe when inserting the mandrel. It is not intended for this purpose. In addition, as a conventional example of billet hydrostatic extrusion technology,
No. 55167, No. 49-63641, No. 57-11719, etc. are known, but these all involve extrusion processing of a billet made of a single material or a composite material with a covering material provided on the outside of the core material. and is not directed to composite billets for internally coated composite pipes using mandrels.
［問題点を解決するための手段及び作用］
この発明は、ビレツトの先端部を略円錐状の単
一金属製プラグ３とし、該プラグはマンドレルの
先端部を圧入してこれを一体にカシメることによ
りシールするマンドレル挿入口を軸心に有すると
共に押出し用ダイスの内面に適合するテーパ面を
有する略円錐状のものであり、該プラグ３の後端
面（すなわち外径の大きい側）に前記マンドレル
の外径より大きい内径を有する薄肉の被覆用パイ
プ２の一端を溶接（ろう付けを含む）し、その被
覆用パイプ２の周囲に基材となる中空ビレツト１
を配設してその一端を前記プラグの後端面に溶接
し、押出し後端側の中空ビレツトと被覆用パイプ
の間に溶接（ろう付けを含む）６′による気密処
理を施すと共にそれらの後端面に上記マンドレル
の後端部に一体に存する、ストツパ４を当接して
複合ビレツトを構成したことにより、この複合ビ
レツトにマンドレル５を挿入した際に被覆用パイ
プ２のマンドレル５によるしごき加工に起因する
破断が防止されると共にビレツト先端のプラグ部
分におけるシールが確保される。[Means and effects for solving the problems] In this invention, the tip of the billet is a substantially conical single metal plug 3, and the plug is press-fitted with the tip of a mandrel and swaged together. The plug 3 has a substantially conical shape having a mandrel insertion port at its axis for sealing and a tapered surface that fits the inner surface of the extrusion die. One end of a thin-walled covering pipe 2 having an inner diameter larger than the outer diameter of is welded (including brazing), and a hollow billet 1 serving as a base material is placed around the covering pipe 2.
is arranged and one end is welded to the rear end surface of the plug, and airtight treatment is performed by welding (including brazing) 6' between the hollow billet on the extruded rear end side and the covering pipe, and the rear end surface thereof is By forming a composite billet by abutting the stopper 4, which is integrally present at the rear end of the mandrel, when the mandrel 5 is inserted into the composite billet, ironing of the covering pipe 2 by the mandrel 5 occurs. Breakage is prevented and a seal at the plug portion at the tip of the billet is ensured.
［実施例］
実施例 １
内面Cu被覆Ti管押出し用に第１図に示す構造
の複合ビレツトを作製した。すなわち、複合ビレ
ツト先端のプラグ３は截頭円錐状でCu製とし、
その軸心に径28.7mm、長さ約50mmのマンドレル挿
入用の孔を有し、その後端面に内径31.5mm、肉厚
0.5mm、長さ900mmのCu管２をその軸心がプラグ孔
の軸心に一致するように溶接し、その周囲に内径
33.0mm、外径160mm、長さ900mmのTi製中空ビレツ
ト１を配設した。そして先端側のCu製プラグと
Ti製ビレツト、及び後端側のTi製ビレツトとCu
管とはそれぞれ溶接６，６′により接着した。こ
うして作製した複合ビレツトの孔に外径30.5mmの
工具鋼製マンドレル５を第１図にしめすように挿
入した。ただしその際、Cu製プラグ３の孔径は
マンドレル５の径より若干小さいため、この部分
はマンドレル５の先端に形成したテーパ部を利用
してマンドレル５をプラグ孔に強制圧入し、これ
によりビレツト先端部のシールを確保した。[Examples] Example 1 A composite billet having the structure shown in FIG. 1 was prepared for extrusion of a Ti tube with a Cu-coated inner surface. That is, the plug 3 at the tip of the composite billet has a truncated conical shape and is made of Cu.
It has a hole for inserting a mandrel with a diameter of 28.7 mm and a length of about 50 mm at its axis, and an inner diameter of 31.5 mm and a wall thickness on the rear end surface.
A Cu tube 2 with a length of 0.5 mm and a length of 900 mm is welded so that its axis coincides with the axis of the plug hole, and the inner diameter is
A Ti hollow billet 1 with a diameter of 33.0 mm, an outer diameter of 160 mm, and a length of 900 mm was installed. And the Cu plug on the tip side
Ti billet and rear end side Ti billet and Cu
They were bonded to the tubes by welding 6 and 6', respectively. A tool steel mandrel 5 having an outer diameter of 30.5 mm was inserted into the hole of the composite billet thus prepared as shown in FIG. However, at that time, the hole diameter of the Cu plug 3 is slightly smaller than the diameter of the mandrel 5, so the mandrel 5 is forcibly press-fitted into the plug hole using the taper part formed at the tip of the mandrel 5, and the tip of the billet is The department's seal was secured.
こうして作製された複合ビレツト／マンドレル
のセツトを孔径40.5mmのダイス（図示せず）上に
配置し、ひまし油を圧力媒体として押出し温度
600℃で静水圧押出しを行つたところ、約13000
Kg／cm2の押出し圧力で外径40.5mm、肉厚5.0mmの
内面にCuが被覆されたTi管を支障なく押し出す
ことができた。 The thus prepared composite billet/mandrel set was placed on a die (not shown) with a hole diameter of 40.5 mm, and extruded using castor oil as a pressure medium at a temperature of
When hydrostatic extrusion was carried out at 600℃, the result was approximately 13,000
At an extrusion pressure of Kg/cm 2 , a Ti tube with an outer diameter of 40.5 mm and a wall thickness of 5.0 mm whose inner surface was coated with Cu could be extruded without any problems.
実施例 ２
内面Cu被覆ジルカロイ管押出し用に第１図に
示す構造の複合ビレツトを作製した。すなわち、
複合ビレツト先端のプラグ３は截頭円錐状でCu
製とし、その軸心に径24.7mm、長さ約50mmのマン
ドレル５挿入用の孔を有し、その後端面に内径27
mm、肉厚0.5mm、長さ900mmのCu管２をその軸心が
プラグ孔の軸心に一致するように溶接し、その周
囲に内径29mm、外径160mm、長さ900mmのジルカロ
イ−２合金（1.5％Sn−0.15％Fe−0.10％Cr−
0.05％Ni−残部Zr）製の中空ビレツト１を配設
した。そして先端側のCu製プラグとジルカロイ
−２合金製ビレツト、及び後端側のジルカロイ−
２合金製ビレツトとCu管とはそれぞれ特殊ろう
付け６，６′により接着した。こうして作製した
複合ビレツトの孔に外径25.5mmの工具構成マンド
レル５を第１図に示すように挿入した。ただしそ
の際実施例１と同様に、Cu製プラグ３の孔径は
マンドレル５の径より若干小さいため、この部分
はマンドレル５の先端に形成したテーパ部を利用
してマンドレル５をプラグ孔に強制圧入し、これ
によりビレツト先端部のシールを確保した。Example 2 A composite billet having the structure shown in FIG. 1 was prepared for extrusion of a Zircaloy tube whose inner surface was coated with Cu. That is,
Plug 3 at the tip of the composite billet has a truncated conical shape and is made of Cu.
It has a hole for inserting a mandrel 5 with a diameter of 24.7 mm and a length of about 50 mm at its axis, and an inner diameter of 27 mm at its rear end.
A Cu tube 2 with a wall thickness of 0.5 mm and a length of 900 mm is welded so that its axis coincides with the axis of the plug hole, and around it is a Zircaloy-2 alloy with an inner diameter of 29 mm, an outer diameter of 160 mm, and a length of 900 mm. (1.5%Sn−0.15%Fe−0.10%Cr−
A hollow billet 1 made of 0.05% Ni (balance Zr) was provided. And a Cu plug and a Zircaloy-2 alloy billet on the tip side, and a Zircaloy-2 alloy on the rear end side.
The billet made of the two alloys and the Cu tube were bonded by special brazing 6 and 6', respectively. A tool-forming mandrel 5 having an outer diameter of 25.5 mm was inserted into the hole of the composite billet thus produced as shown in FIG. However, in this case, as in Example 1, the hole diameter of the Cu plug 3 is slightly smaller than the diameter of the mandrel 5, so the mandrel 5 is forcibly press-fitted into the plug hole using the tapered part formed at the tip of the mandrel 5. This ensured a seal at the tip of the billet.
こうして作製された複合ビレツト／マンドレル
のセツトを孔径31.5mmのダイス（図示せず）上に
配置し、ひまし油を圧力媒体として押出し温度
600℃で静水圧押出しを行つたところ、約13000
Kg／cm2の押出し圧力で外径31.5mm、内径3.0mmの
内面にCuが被覆されたジルカロイ−２管を支障
なく押し出すことができた。 The thus prepared composite billet/mandrel set was placed on a die (not shown) with a hole diameter of 31.5 mm, and extruded using castor oil as a pressure medium at a temperature of
When hydrostatic extrusion was carried out at 600℃, the result was approximately 13,000
At an extrusion pressure of Kg/cm 2 , a Zircaloy-2 tube with an outer diameter of 31.5 mm and an inner diameter of 3.0 mm whose inner surface was coated with Cu could be extruded without any problem.
［比較例］
内面Cu被覆ジルカロイ管押出し用に従来技術
に基づき第２図に示す構造の複合ビレツトを作製
した。すなわち、円錐状の先端部１１の孔径25.7
mm、本体部１２の孔径29mm、外径160mm、長さ900
mmのジルカロイ−２（上記と同じ組成）製の中空
ビレツト１の孔内に外径23.5mm、肉厚0.5mmのCu
管を該ビレツト１の全長に亘つて挿入し、ラバー
プレスにより拡管し、中空ビレツト１の内面に密
着させた。前後端でのCuとジルカロイ−２の接
着は特殊ろう付け６，６′により実施した。こう
して作製した複合ビレツトの孔に外径25.5mmの工
具鋼製マンドレル５を第２図に示すように挿入し
た。次いで孔径31.5mmのダイス（図示せず）を使
用し、ひまし油を圧力媒体として押出し温度600
℃で静水圧押出しを試みが、マンドレル／複合ビ
レツト間より圧力媒体が漏れ出し、押出し不可能
であつた。その後マンドレル５を抜き取り、複合
ビレツトの先端部を点検したところ、Cu層の一
部に亀裂が生じていた。[Comparative Example] A composite billet having the structure shown in FIG. 2 was prepared based on the conventional technique for extrusion of a Zircaloy tube whose inner surface was coated with Cu. That is, the hole diameter of the conical tip 11 is 25.7
mm, hole diameter of main body 12 29mm, outer diameter 160mm, length 900mm
A Cu hole with an outer diameter of 23.5 mm and a wall thickness of 0.5 mm is placed in the hole of a hollow billet 1 made of mm Zircaloy-2 (same composition as above).
A tube was inserted over the entire length of the billet 1, expanded using a rubber press, and brought into close contact with the inner surface of the hollow billet 1. Bonding of Cu and Zircaloy-2 at the front and rear ends was carried out by special brazing 6, 6'. A tool steel mandrel 5 having an outer diameter of 25.5 mm was inserted into the hole of the composite billet thus prepared as shown in FIG. Then, using a die with a hole diameter of 31.5 mm (not shown), the extrusion temperature was 600°C using castor oil as a pressure medium.
Attempts were made to perform hydrostatic extrusion at 0.degree. C., but the pressure medium leaked between the mandrel and the composite billet, making extrusion impossible. Thereafter, when the mandrel 5 was removed and the tip of the composite billet was inspected, it was found that a crack had formed in a part of the Cu layer.
そこで、Cu管密後の中空ビレツト先端部１１
の孔径を順次拡大して行つたところ、孔径25.1mm
でCu管２の亀裂生成はなくなつたが、マンドレ
ル先端部において複合ビレツトによる十分な緊縛
力が得られず、マンドレル／複合ビレツト間で圧
力媒体が漏れ出し、押出し不可能であつた。 Therefore, after sealing the Cu tube, the hollow billet tip 11
When the hole diameter was gradually enlarged, the hole diameter was 25.1 mm.
Although cracks in the Cu tube 2 were no longer generated, sufficient binding force was not obtained by the composite billet at the tip of the mandrel, and pressure medium leaked between the mandrel and the composite billet, making extrusion impossible.
［変形例］
上記の実施例では内面に単一の被覆層７を有す
る複合管の静水圧押出し用複合ビレツトについて
説明したが、この発明は第４図に示すように内面
被覆層７及び外面被覆層８を有する複合管あるい
は第５図に示すように内面に２層の被覆層７，
７′を有する複合管の静水圧押出し用複合ビレツ
トについても適用されるものである。[Modification] In the above embodiment, a composite billet for hydrostatic extrusion of a composite pipe having a single coating layer 7 on the inner surface was described, but the present invention has a single coating layer 7 on the inner surface and an outer coating as shown in FIG. A composite pipe with a layer 8 or two coating layers 7 on the inner surface as shown in FIG.
This also applies to composite billets for isostatic extrusion of composite pipes having a diameter of 7'.
［発明の効果］
以上説明したようにこの発明によれば、マンド
レル挿入時の内面被覆用パイプの破断が防止さ
れ、従つて押出し開始時の圧力媒体の漏れが防止
され押出し成功率が著しく上昇し、かつ従来構造
の複合ビレツトと比較して内面被覆用パイプとし
て薄肉のものあるいは軟質の材料を使用すること
ができる。[Effects of the Invention] As explained above, according to the present invention, breakage of the inner surface coating pipe when inserting the mandrel is prevented, and therefore, leakage of pressure medium at the start of extrusion is prevented, and the extrusion success rate is significantly increased. In addition, compared to the conventional composite billet structure, a thinner walled pipe or a softer material can be used as the inner coating pipe.
第１図はこの発明に係る複合ビレツトの一実施
例を示す断面図、第２図は従来の複合ビレツトを
示す断面図、第３図は内面に単一の被覆層を有す
る複合管を示す断面図、第４図は内面及び外面に
被覆層を有する複合管を示す断面図、第５図は内
面に２層の被覆層を有する複合管を示す断面図で
ある。
１……中空ビレツト、１１……先端部、１２…
…本体部、２……被覆用パイプ、３……プラグ、
４……ストツパ、５……マンドレル、５１……テ
ーパ部、６，６′……溶接又はろう付け部、７，
７′……内面被覆層、８……外面被覆層。
FIG. 1 is a sectional view showing an embodiment of a composite billet according to the present invention, FIG. 2 is a sectional view showing a conventional composite billet, and FIG. 3 is a sectional view showing a composite pipe having a single coating layer on the inner surface. 4 are cross-sectional views showing a composite tube having a coating layer on the inner and outer surfaces, and FIG. 5 is a cross-sectional view showing a composite tube having two coating layers on the inner surface. 1...Hollow billet, 11...Tip, 12...
...Main body, 2... Covering pipe, 3... Plug,
4... Stopper, 5... Mandrel, 51... Tapered part, 6, 6'... Welded or brazed part, 7,
7′... Inner surface coating layer, 8... Outer surface coating layer.
Claims (1)
カシメることによりシールするマンドレル挿入孔
を軸心に有すると共に押出し用ダイスの内面に適
合するテーパ面を有する略円錐状の単一金属製プ
ラグの後端面に、前記マンドレルの外径より大き
い内径を有する薄肉の被覆用パイプの一端を該プ
ラグと同一軸心に溶接し、この被覆用パイプの周
囲に基材となる中空ビレツトを配設してその一端
を前記プラグの後端面に溶接し、一方押出し後端
側において前記被覆用パイプと前記中空ビレツト
の他端を溶接することにより気密処理を施して複
合ビレツトを形成し、前記により形成された複合
ビレツトの中空部に上記マンドレルを挿着してそ
のマンドレルの先端部を上記プラグのマンドレル
挿入孔に圧入して一体にカシメることによりシー
ルすると共に、前記マンドレルの後端部に一体に
存するストツパを前記複合ビレツトの押出し後端
側に当接して構成されたことを特徴とする内面被
覆複合管の静水圧押出し用複合ビレツト。1 A substantially conical single metal plug having a mandrel insertion hole in its axis that is sealed by press-fitting the tip of the mandrel and caulking it together, and having a tapered surface that fits the inner surface of an extrusion die. One end of a thin-walled covering pipe having an inner diameter larger than the outer diameter of the mandrel is welded to the rear end surface on the same axis as the plug, and a hollow billet serving as a base material is arranged around the covering pipe. One end of the plug is welded to the rear end surface of the plug, and the other end of the sheathing pipe and the hollow billet are welded on the extruded rear end side to perform airtight treatment to form a composite billet. The mandrel is inserted into the hollow part of the composite billet, the tip of the mandrel is press-fitted into the mandrel insertion hole of the plug, and the plug is caulked together to form a seal. A composite billet for hydrostatic extrusion of an internally coated composite pipe, characterized in that the billet is configured such that the billet is in contact with the extrusion rear end side of the composite billet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60201313A JPS6261719A (en) | 1985-09-11 | 1985-09-11 | Composite billet for hydrostatic extrusion of internally coated composite pipes |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60201313A JPS6261719A (en) | 1985-09-11 | 1985-09-11 | Composite billet for hydrostatic extrusion of internally coated composite pipes |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6261719A JPS6261719A (en) | 1987-03-18 |
| JPH025485B2 true JPH025485B2 (en) | 1990-02-02 |
Family
ID=16438937
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP60201313A Granted JPS6261719A (en) | 1985-09-11 | 1985-09-11 | Composite billet for hydrostatic extrusion of internally coated composite pipes |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6261719A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3273690B2 (en) * | 1994-03-24 | 2002-04-08 | 株式会社ニフコ | Glass holder |
| CN103737263B (en) * | 2013-12-25 | 2016-08-31 | 西安西工大超晶科技发展有限责任公司 | A kind of roller expansion type mechanical plug for heat transfer tube of steam generator and manufacture method thereof |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000155089A (en) * | 1998-11-20 | 2000-06-06 | Murata Mfg Co Ltd | Dispersibility evaluating method |
| JP2005351808A (en) * | 2004-06-11 | 2005-12-22 | Nikon Corp | Abrasive dispersion inspection device |
-
1985
- 1985-09-11 JP JP60201313A patent/JPS6261719A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6261719A (en) | 1987-03-18 |
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