JPS58181805A - Manufacture of dense seamless pipe - Google Patents
Manufacture of dense seamless pipeInfo
- Publication number
- JPS58181805A JPS58181805A JP6277082A JP6277082A JPS58181805A JP S58181805 A JPS58181805 A JP S58181805A JP 6277082 A JP6277082 A JP 6277082A JP 6277082 A JP6277082 A JP 6277082A JP S58181805 A JPS58181805 A JP S58181805A
- Authority
- JP
- Japan
- Prior art keywords
- swaging
- density
- extrusion
- sintering
- seamless pipe
- 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.)
- Granted
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/22—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces for producing castings from a slip
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Powder Metallurgy (AREA)
Abstract
Description
【発明の詳細な説明】
この発明は金属粉末の押出、スェージング矯正加工、加
熱焼結等の工程よりなる高緻密シームレスパイプの製造
方法に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a highly dense seamless pipe, which includes steps such as extrusion of metal powder, swaging straightening, and heating sintering.
従来、金属粉末からシームレスパイプをＩｌｉ造する方
法として、金属粉末、粘結剤、潤滑剤、水などからなる
混練物をスクリュウ押出し、ついで押出した素形管を乾
燥後、所定温度で加熱焼結する。その後スェージング矯
正加工して緻密度を高め、さらに再びＤ口熱焼結する方
法がある。この場合押出、乾燥状態におけるシームレス
パイプの密度は１７〜．１９１／Ｃ１ｌである。つぎに
これを加熱焼結すると収Ｈによって円周方向に細長い割
れか生じ易く、この櫨の欠′ｆ！ｉ１により良品歩留が
着しく低いという欠点がある。Conventionally, the method for manufacturing seamless pipes from metal powder is to extrude a mixture of metal powder, binder, lubricant, water, etc. using a screw, then dry the extruded pipe, then heat and sinter it at a predetermined temperature. do. There is a method in which the material is then subjected to swaging correction processing to increase its density, and then D-shaped hot sintering is performed again. In this case, the density of the seamless pipe in the extruded and dry state is 17~. 191/C1l. Next, when this is heated and sintered, elongated cracks are likely to occur in the circumferential direction due to the agglomeration. There is a drawback that the yield of good products is extremely low due to i1.
この発明の目的は前記の欠陥がほとんど発生せず、しか
も従来の押出焼結シームレスパイプにくらぺて着しく緻
密度か高い高緻密シームレスパイプの１ｌｌｉ造方法を
提供することである。An object of the present invention is to provide a method for producing a highly dense seamless pipe in which almost no of the above-mentioned defects occur, and which has a higher density than conventional extrusion-sintered seamless pipes.
またこの発明の要旨は、押出乾燥状態の素形管をスェー
ジング矯正加工後加熱焼結し、その後少なくとも／回置
スェージング矯正加工および再加熱焼結することである
。Further, the gist of the present invention is to heat and sinter the preformed tube in an extrusion dry state after swaging and straightening, and then subjecting it to at least/return swaging and reheating and sintering.
以下、この発明の実施例として５ＵＳｊ／６Ｌステンレ
ス鋼押出焼結シームレスパイプの製造（へ）を従来法と
一比較しなから説明する。たとえば第１衣に示すように
、所定の配合割合へらなるＳ練物を所定の押出用金型（
従来法；外径／＆５Ｉｌａ×内住／２０ｋｍ、この発明
決：外径／と、５’ｆｌＸ内径／２０１１１１１）を用
い、同一圧力でスクリュウ押出成形第 ／ 表
（注）／、■、■、■は第ｌ、第２．第３工程であるこ
とを示す。Hereinafter, as an example of the present invention, the production of a 5USj/6L stainless steel extrusion sintered seamless pipe will be explained with a comparison with a conventional method. For example, as shown in No.
Conventional method: Outer diameter/&5Ila x inner diameter/20km, this invention: Extrusion molding using screw extrusion at the same pressure using outer diameter/ and 5'fl x inner diameter/2011111) Table (Note)/, ■, ■, ■ is the first, second. Indicates that it is the third step.
ユ蕾寸沃閤における（ ）数字字は外径、〔〕内数字
は内径全示す。The numbers in parentheses ( ) indicate the outer diameter, and the numbers in [ ] indicate the entire inner diameter.
（各１０本）した。その後これを加温乾燥した場合、両
者の密度はほぼ同等であった。つぎに従来法による場合
は密度が３．７〜ｌ ９１／ｃｄの素形管を第２表に示
す条件で加熱焼結したが、シームレスパイプには前記の
欠陥が発生しており、これにより良品歩留は３０％に低
下した。このうち前記の欠陥がないパイプを１回スェー
ジング矯正加工することによって密度は仏ｌ〜よＯｆ／
−に達した。(10 each). When this was then heated and dried, the densities of the two were almost the same. Next, when using the conventional method, a preformed pipe with a density of 3.7 to 191/cd was heated and sintered under the conditions shown in Table 2, but the above-mentioned defects occurred in the seamless pipe. The yield of good products decreased to 30%. Of these, by performing swaging correction once on a pipe that does not have the above-mentioned defects, the density can be reduced to 1.
- reached.
つぎにこれを同表に示す条件で再加熱焼結すると密度は
まＯ−よ／ Ｉ／ｃｗ！程度まで高められるに過ぎない
。Next, when this is reheated and sintered under the conditions shown in the same table, the density becomes O-yo/I/cw! It can only be heightened to a certain extent.
これに対して、この発明法による揚台ハＨ度か３．７〜
３．９ ｆ／ｄの素形管（外径／１．０閤×内径ｌ／ｊ
騙）を第２表に示すように７回スェージング矯正加工し
たことにより密度は！、７〜＆ ０ ｆ／ｃｖｌに増大
し、つぎにこれを第２表に示す従来法と同一条件で加熱
焼結し、ついで再開／回スエージンダ矯正加工するのみ
で密度はｚＯ〜７コＵ讐に増大し、前記の欠陥シボはと
んど発生せず、良品歩留は９５％であった。つぎにこれ
を同表に示す従来法と同一条件で再度ＩＸＪＸ焼熱する
と密度はＺ２〜Ｚ３１／ａＪにまで増大させることがで
きた。On the other hand, the lifting platform according to this invention has a temperature of 3.7~
3.9 f/d original pipe (outer diameter/1.0 yen x inner diameter l/j
As shown in Table 2, the density is reduced by swaging straightening process 7 times. , 7~&0 f/cvl, and then heated and sintered under the same conditions as the conventional method shown in Table 2, and then restarted/sweginder straightening process to reduce the density to zO ~ 7 f/cvl. The defective grains hardly occurred, and the yield of non-defective products was 95%. Next, when this was subjected to IXJX firing again under the same conditions as the conventional method shown in the same table, the density could be increased to Z2 to Z31/aJ.
この５ＵＳｊ／ｊＬステンレス鋼の理論密度は約７９ｆ
／−であるから、理論密度に対して従来法では約ＩＪ１
この発明法では約１１にまで緻密化することかで暑た。The theoretical density of this 5USj/jL stainless steel is approximately 79f
/-, so in the conventional method, about IJ1 with respect to the theoretical density
In this invention method, the density was increased to about 11.
したがって、この発明法によれば従来法にくらべて着し
く緻密度が高いシームレスパイプかｗ命できることがわ
かった。Therefore, it was found that according to the method of the present invention, it was possible to produce seamless pipes that were more compact and denser than the conventional method.
前記のとおり、この発明法は押出、乾燥状態の素形管を
スェージング矯正加工後加熱焼結し、その後少なくとも
１同書スェージング矯正加工および弗加熱焼結すること
が特徴であって、加熱焼結条件を変更することによって
なお一層理論密度に近づけることができる。As mentioned above, the method of this invention is characterized by heating and sintering the preformed tube in an extruded and dry state after swaging straightening, and then subjecting it to at least one swaging straightening and fluoroheating sintering, and the heating sintering conditions are By changing , the density can be brought even closer to the theoretical density.
また押出→乾燥状態の素形管をスェージング鳴止Ｄロエ
することによって密度を約仏！Ｉ／ｃｄ以上に高めると
、前記の欠陥が発生しにくいことを知見している。In addition, the density can be reduced by extruding and swaging the dry preformed tube! It has been found that the above-mentioned defects are less likely to occur when the temperature is increased above I/cd.
つぎに前記５ＵＳ３／ｌＬステンレス鋼押出焼結シーム
レスパイプの製造例とほぼ同様な工程で青銅（Ｐ１３Ｃ
，２）押出焼結シームレスバイブを製造したか、はぼ同
様の成績を得た。Next, bronze (P13C
, 2) produced an extrusion sintered seamless vibrator, and obtained similar results.
以上のとおり、この発明法は従来法にくらぺて者しく緻
密度が高い押出焼結シームレスバイブが制置でき、−量
中に前記の欠陥はほとんど発生しないため、安定した品
實性能の押出焼結シームレスバイブを提供できる。As described above, this invention method can produce an extrusion sintered seamless vibrator with a higher density compared to the conventional method, and the above-mentioned defects hardly occur during extrusion, resulting in extrusion with stable product performance. We can provide sintered seamless vibes.
待 許 出 願 人 マイクロフィルター株式会社Person waiting for permission to leave Microfilter Co., Ltd.
Claims (1)
成形して得られた素形管を乾燥処理し、ついでスェージ
ング矯正加工後、所定温度で加熱焼結し、その後少なく
とも１同書スェージング矯正加工および再加熱焼結する
ことを特歇とする高緻密シームレスパイプの製造方法。A preformed tube obtained by extrusion molding a mixed material consisting of metal powder, water, a binder, a lubricant, etc. is dried, then swaged and straightened, heated and sintered at a predetermined temperature, and then at least one A method for producing a high-density seamless pipe that includes swaging straightening and reheating sintering.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6277082A JPS58181805A (en) | 1982-04-15 | 1982-04-15 | Manufacture of dense seamless pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6277082A JPS58181805A (en) | 1982-04-15 | 1982-04-15 | Manufacture of dense seamless pipe |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS58181805A true JPS58181805A (en) | 1983-10-24 |
| JPS6140281B2 JPS6140281B2 (en) | 1986-09-08 |
Family
ID=13209946
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6277082A Granted JPS58181805A (en) | 1982-04-15 | 1982-04-15 | Manufacture of dense seamless pipe |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58181805A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4894158A (en) * | 1986-09-11 | 1990-01-16 | Kirin Beer Kabushiki Kaisha | Porous filter element with undulations |
| JP2002528644A (en) * | 1998-11-02 | 2002-09-03 | ゲーカーエヌ・ジンター・メタルス・ゲゼルシャフト・ミト・ベシュレンクテル・ハフツング | Method for manufacturing sintered member with secondary deformation of green compact |
-
1982
- 1982-04-15 JP JP6277082A patent/JPS58181805A/en active Granted
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4894158A (en) * | 1986-09-11 | 1990-01-16 | Kirin Beer Kabushiki Kaisha | Porous filter element with undulations |
| JP2002528644A (en) * | 1998-11-02 | 2002-09-03 | ゲーカーエヌ・ジンター・メタルス・ゲゼルシャフト・ミト・ベシュレンクテル・ハフツング | Method for manufacturing sintered member with secondary deformation of green compact |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6140281B2 (en) | 1986-09-08 |
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