JPS6312692B2 - - Google Patents
Info
- Publication number
- JPS6312692B2 JPS6312692B2 JP19081281A JP19081281A JPS6312692B2 JP S6312692 B2 JPS6312692 B2 JP S6312692B2 JP 19081281 A JP19081281 A JP 19081281A JP 19081281 A JP19081281 A JP 19081281A JP S6312692 B2 JPS6312692 B2 JP S6312692B2
- Authority
- JP
- Japan
- Prior art keywords
- die
- tube
- walled
- thin
- different
- 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
- 238000000034 method Methods 0.000 claims description 27
- 238000004519 manufacturing process Methods 0.000 claims description 8
- 239000000463 material Substances 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 238000000465 moulding Methods 0.000 description 4
- 238000007796 conventional method Methods 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 238000000137 annealing Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 238000005482 strain hardening Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
- B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
- B21C37/15—Making tubes of special shape; Making tube fittings
- B21C37/16—Making tubes with varying diameter in longitudinal direction
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Metal Extraction Processes (AREA)
Description
本発明は、内径が一定で外径が部分的に異なる
異径管の製造方法に関するものである。
内径が一定で外径が部分的に異なる第1図のよ
うな異径管1を製造する場合の従来の製造法に
は、内径、外径ともに一様な管の外周を旋盤等
にて切削する方法、引抜き加工により薄肉部2
を両側から成形し、厚肉部3を残す方法、所要
間隔で大径部と小径部を有するプラグと管とを一
体的に移動させてダイスを通して引抜き、ついで
該プラグを抜き出す方法(特公昭52−471)、糸
巻き型のプラグを随時往復動させながらダイスを
通して引抜く方法(特公昭52−5471)等がある。
しかし、は材料の歩留が悪く、また成品の長さ
が限定され、は異径となる成品厚肉部が1ケ所
にしか成形されず、また引抜き方向を逆転させる
ため工程数が増し、、は成品の寸法精度が劣
り、さらに〜については成品の薄肉部と厚肉
部における冷間加工率が異なるため成品異径管内
の材質が不均一となり、何れも問題点を有してい
た。
本発明は、1回の引抜きで寸法精度よく、歩留
よく、必要に応じて複数の厚肉部も成形可能であ
り、さらに焼鈍工程との組合せによつて成品内の
材質が均一な異径管を製造することを目的とす
る。
本発明製造方法は、成品異径管の厚肉部と同一
形状同一寸法の谷部を有するスライド可能な分割
型2段ダイスと、平行部および後部にテーパー部
を有するプラグとの間に管を通し、該2段ダイス
の各段ダイスとプラグとの位置関係を適時変更し
て管を引抜くことを特徴とする。
以下に本発明法を図面により説明する。第2図
は、本発明法により原管14を引抜き異径管1を
製造する状態を示している。前方ダイス6および
後方ダイス7がボルト10によつて拘止されて分
割型2段ダイスが構成され、前方ダイス6の後部
および後方ダイス7の前部で形成されるダイス谷
部の形状および寸法が異径管1の厚肉部の形状お
よび寸法と一致している。該2段ダイスはダイス
タンド4内に保持され、デイスタンスピース5に
よつて該ダイスタンド4の前部(ジヨー12側)
に設けられたダイストツパー9との間に所要間隔
dが保たれている。該間隔dは、第1図に示す成
品異径管の厚肉部長さlと一致させる。プラグ8
は平行部とテーパー部を有し、ダイス孔内に挿入
されプラグロツド13によつて後方で固定されて
いる。デイスタンスピース5はボルト11によつ
て後方ダイス7に拘止され、本例では第3図のよ
うに4個用いられいずれもボルト11をはずすと
ダイスタンド外に取り除くことができるようにな
つている。前方ダイス6は第3図に示すように2
分割されていて、第2図に示すようにボルト10
によつて後方ダイス7に拘止されており、デイス
タンスピース5を取り除いた後、ボルト10をは
ずすとダイスタンド外に取り除くことができるよ
うになつている。
第2図のようにデイスタンスピース5がセツト
された状態では、前方ダイス6のベアリングラン
ド16は後端がプラグ8の平行部上に位置され、
後方ダイス7のベアリングランド17はプラグ8
の後方に位置され、デイスタンスピース5が取り
除かれて両ダイス6,7が前方に移動しダイスト
ツパー9に接して停止した状態では、少なくとも
後方ダイス7のベアリングランド17がプラグ8
の平行部上に位置される。第2図に示す前方ダイ
スベアリングランド16の径および後方ダイスベ
アリングランド17の径を成品異径管薄肉部の外
径と一致させ、プラグ8の平行部の外径を成品異
径管の内径と一致させる。
第4図に成形工程を示す。原管14の寸法は成
品に要求される加工率に応じて適宜選択するが、
内径は成品内径よりも大とする。成形に際して、
まず第4図aのように原管14をドローベンチに
セツトする。このとき、原管14の一端を図の右
方から後方ダイス7および前方ダイス6に通す
が、あらかじめ図示しないロータリースエージヤ
ー等の加工機により必要長さだけ細径にしてお
く。また原管14の先端にはジヨー12でつかめ
るように口付け部15を前記加工機等により形成
しておく。第4図aのように原管14の加工した
一端をダイス孔に通し、ジヨー12にて口付け部
15をつかみ、後方よりプラグ8を原管14内に
挿入し、プラグロツド13の後端は固定せずフリ
ーにしておく。この状態でジヨー12を前方に引
くと原管14とプラグ8が共にダイス孔内に入
り、第4図bの状態すなわちプラグ平行部19と
プラグテーパー部20の境界が前方ダイスベアリ
ングランド16の後端の後方(第4図では右方)
直近にきた状態でプラグロツド13の後端を固定
することによつてプラグ8の位置を固定する。こ
のときプラグ8の先端と前方ダイスベアリングラ
ンド16の間にある管は成品異径管の薄肉部2と
して成形されている。
つぎに成品異径管の前方薄肉部の成形を行う。
第4図bの状態から同図cの状態まで、ジヨー1
2を前方に引くと原管14は、まず後方ダイス7
によつて外径側が圧下されるとともに肉厚全体が
管軸に向つて変形し、ついでプラグテーパー部2
0に沿つて内径側が拡管されるとともに外径側が
ダイス谷部18内にわずかに盛上がり、つぎに前
方ダイス6とプラグ平行部19によつて外径側お
よび内径側が圧下され成品異径管の薄肉部2が成
形される。第4図cは薄肉部2が所要長さ成形さ
れた時点であり、この状態でジヨー12を停止さ
せる。
つぎに成品異径管の厚肉部の成形を行う。まず
第4図cに示すようにデイスタンスピース5を取
りはずす。この取りはずしは同図には示していな
いが第2図、第3図に示したボルト11をはずす
ことによつて行う。ついで、ジヨー12を前方に
引くと、第4図dに示すように、前方ダイス6と
後方ダイス7の間にある変形された管がプラグテ
ーパー部20に沿つて拡管され、ダイス谷部18
内に充満されつつ前方ダイス6を後方から押し、
また原管14が後方ダイス7を後方から押し、前
方ダイス6、後方ダイス7はダイスタンド4の内
面を摺動して前方に向う。このとき、プラグ8に
よつてダイス谷部18内に充満された管が成品異
径管の厚肉部3となる。第4図dではダイス谷部
18にはまだ空所がある。第4図eのように後方
ダイスベアリングランド17がプラグ平行部19
上にくると、ダイス谷部18は完全に充満され、
成品異径管の厚肉部3が完成する。このとき、前
方ダイス6および後方ダイス7はダイストツパー
9に接し、同時にジヨー12を停止する。
つぎに成品異径管の後方薄肉部の成形を行う。
まず、第4図eの状態でボルト10をはずし、つ
いでジヨー12を前方に引くと、第4図fに示す
ように、原管14は後方ダイス7とプラグ8によ
つて成形されて後方薄肉部2′となり、すでに成
形されている厚肉部3が前方ダイス6をダイスタ
ンド4の外に押し出す。押し出された前方ダイス
6は分割されているので、第4図gのように成品
異径管1から容易に取りはずすことができる。さ
らにジヨー12を前方に引いて原管14を後方ダ
イス7とプラグ8の間で引抜き、異径管1の成形
が完了する。
なお、厚肉部3を複数有する異径管を成形する
場合は、第4図gのようにして後方薄肉部2′を、
必要とする中間薄肉部の長さよりもダイス谷部長
さ分だけ短い長さ成形した後、第5図aに示すよ
うに前方ダイス6をボルト10にて後方ダイス7
に取りつける。ついでプラグロツド13後端の固
定をはずしジヨー12を後方に移動させ、第5図
bのように管と前方ダイス6、後方ダイス7、プ
ラグ8を一体としてダイスタンド4内を後方に移
動させた後デイスタンスピース5を取りつける。
ついで、ジヨー12を前方に引き、第5図cのよ
うにプラグ8を原管14とともに引き出し、プラ
グ8と前方ダイス6との位置関係が第4図bのよ
うになつたときにジヨー12を停止し、プラグロ
ツド13の後端を固定する。つぎに、デイスタン
スピース5を取りはずし、ジヨー12を前方に引
く。すると第4図dと同様にして成品異径管厚肉
部3が成形される。以下第4図e,f,gと同様
に後方薄肉部を成形する。このように第4図a〜
fの各工程に続けて第5図a〜c、第4図d〜f
の各工程を繰返すことによつて、複数の厚肉部を
有する異径管を製造することができる。
成品異径管の厚肉部寸法が長い場合はダイス谷
部を広くし、第4図cからeに至る引抜き距離を
長くしなければならない。この場合、デイスタン
スピース5を厚くすればよいが、重量が増して取
り付け、取りはずしに支障をきたすときは、第6
図に示すように後方ダイス7の先端のダイスタン
ド4側に切欠き21を設け、ダイストツパー9と
後方ダイス7間の距離dが前記厚肉部長さ(テー
パー部を含む)と等しくなるようにすればよい。
以上のようにして製造した異径管は、薄肉部と
厚肉部とで加工率が異なるため硬さ等の機械的性
質が均一でなく、用途によつては問題を生ずるこ
とがある。このような場合、本発明法においては
つぎのようにして均一な材質にすることができ
る。すなわち、肉厚均一な原管からまず成品異径
管よりも大きい径、肉厚の薄肉部、厚肉部を有す
る中間異径管を第4図のようにして引抜き、つい
でこれを焼鈍し、さらに焼鈍した中間異径管を原
管として第4図のようにして引抜く。このとき、
中間異径管の薄肉部、厚肉部をそれぞれ成品異径
管の薄肉部、厚肉部とし、また成品異径管各部の
加工率が均一になるように中間異径管の内径およ
び薄肉部、厚肉部のサイズを定める。なお、中間
異径管の引抜きを2段ないし3段行えば成品異径
管各部の材質はより均質化される。
実施例
オースナイト系ステンレス鋼管を原管として内
径40.6mm薄肉部肉厚1.2mm、厚肉部肉厚2.0mmの異
径管を第1表に示す各方法により製造した。な
お、第1表C(従来法)は、特公昭52−471号公報
により知られている従来法で製造したものであ
る。
The present invention relates to a method of manufacturing a tube of different diameters, which has a constant inner diameter and partially different outer diameters. The conventional manufacturing method for producing pipes 1 of different diameters as shown in Fig. 1, which have a constant inner diameter and partially different outer diameters, involves cutting the outer periphery of a pipe whose inner and outer diameters are uniform using a lathe or the like. Thin wall part 2 by drawing process
A method in which a plug and a pipe having a large diameter part and a small diameter part are integrally moved at a required interval and pulled out through a die, and then the plug is pulled out (Tokuko Shou 52 -471), a method of pulling the plug through a die while reciprocating the plug at any time (Japanese Patent Publication No. 52-5471), etc.
However, the material yield is poor, the length of the product is limited, the thick part of the product with a different diameter is only formed in one place, and the number of steps increases because the drawing direction is reversed. The dimensional accuracy of the product was poor, and the cold working rate of the thin-walled part and the thick-walled part of the product differed in the products, resulting in non-uniformity of the material inside the product with different diameters, all of which had problems. The present invention has good dimensional accuracy and high yield in one drawing process, and can form multiple thick parts as needed.Furthermore, by combining it with an annealing process, the material inside the product can be made uniform and different diameters can be formed. The purpose is to manufacture pipes. In the manufacturing method of the present invention, a tube is inserted between a slidable split-type two-stage die having a valley portion having the same shape and size as the thick wall portion of the finished tube of different diameters, and a plug having a parallel portion and a tapered portion at the rear. The pipe is drawn out by changing the positional relationship between each die of the two-stage die and the plug as appropriate. The method of the present invention will be explained below with reference to the drawings. FIG. 2 shows the state in which the original tube 14 is drawn out to produce the different diameter tube 1 by the method of the present invention. The front die 6 and the rear die 7 are secured by bolts 10 to form a split two-stage die, and the shape and dimensions of the die valley formed by the rear part of the front die 6 and the front part of the rear die 7 are The shape and dimensions match the thick wall portion of the different diameter tube 1. The two-stage die is held in the die stand 4, and is held at the front part of the die stand 4 (on the side of the die stand 12) by the distance piece 5.
A required distance d is maintained between the die stopper 9 provided at The distance d is made to match the length l of the thick wall portion of the finished pipe with different diameters shown in FIG. Plug 8
has a parallel part and a tapered part, and is inserted into the die hole and fixed at the rear by a plug rod 13. The distance pieces 5 are secured to the rear die 7 by bolts 11, and in this example, four pieces are used as shown in FIG. 3, and each can be removed from the die stand by removing the bolts 11. There is. The front die 6 is 2 as shown in FIG.
The bolt 10 is divided into parts as shown in Figure 2.
It is secured to the rear die 7 by a bolt, and can be removed from the die stand by removing the bolt 10 after removing the distance piece 5. When the distance piece 5 is set as shown in FIG. 2, the rear end of the bearing land 16 of the front die 6 is located on the parallel part of the plug 8.
The bearing land 17 of the rear die 7 is the plug 8
When the distance piece 5 is removed and both dies 6 and 7 move forward and stop in contact with the die stopper 9, at least the bearing land 17 of the rear die 7 is in contact with the plug 8.
is located on the parallel part of. The diameter of the front die bearing land 16 and the diameter of the rear die bearing land 17 shown in FIG. Match. Figure 4 shows the molding process. The dimensions of the raw tube 14 are appropriately selected depending on the processing rate required for the finished product.
The inner diameter shall be larger than the finished product inner diameter. When molding,
First, as shown in FIG. 4a, the original tube 14 is set on a draw bench. At this time, one end of the raw tube 14 is passed through the rear die 7 and the front die 6 from the right side of the figure, but the diameter is previously reduced to the required length using a processing machine such as a rotary swager (not shown). Further, a mouth portion 15 is formed at the tip of the original tube 14 by the processing machine or the like so that it can be gripped by the jaw 12. As shown in Fig. 4a, pass one end of the raw tube 14 through the die hole, grip the mouth part 15 with the jaw 12, insert the plug 8 into the raw tube 14 from the rear, and fix the rear end of the plug rod 13. Leave it free. When the jaw 12 is pulled forward in this state, both the original tube 14 and the plug 8 enter the die hole, and the state shown in FIG. Back of the end (right side in Figure 4)
The position of the plug 8 is fixed by fixing the rear end of the plug rod 13 in the most recent state. At this time, the tube between the tip of the plug 8 and the front die bearing land 16 is formed as a thin wall portion 2 of a finished tube with different diameters. Next, the front thin wall portion of the finished pipe with different diameters is formed.
From the state shown in Fig. 4b to the state shown in Fig. 4c, Joe 1
When you pull 2 forward, the original tube 14 first moves backward to the die 7.
The outer diameter side is pressed down and the entire wall thickness deforms toward the tube axis, and then the plug taper part
0, the inner diameter side is expanded and the outer diameter side is slightly raised in the die valley 18, and then the outer diameter side and the inner diameter side are rolled down by the front die 6 and the plug parallel part 19, resulting in a thin walled product with different diameters. Part 2 is molded. FIG. 4c shows the point in time when the thin-walled portion 2 has been formed to the required length, and the jaw 12 is stopped in this state. Next, the thick-walled portion of the finished pipe with different diameters is formed. First, the distance piece 5 is removed as shown in FIG. 4c. This removal is carried out by removing the bolt 11 shown in FIGS. 2 and 3, although it is not shown in the same figure. Next, when the jaw 12 is pulled forward, the deformed tube between the front die 6 and the rear die 7 is expanded along the plug taper portion 20, and the die valley portion 18 is expanded as shown in FIG. 4d.
Push the front die 6 from behind while filling the inside,
Further, the raw tube 14 pushes the rear die 7 from behind, and the front die 6 and the rear die 7 slide on the inner surface of the die stand 4 and move forward. At this time, the tube filled in the die valley 18 by the plug 8 becomes the thick wall portion 3 of the finished tube with different diameters. In FIG. 4d, there is still a blank space in the die valley 18. As shown in Figure 4e, the rear die bearing land 17 is connected to the parallel part 19 of the plug.
When it comes to the top, the die valley 18 is completely filled,
The thick wall portion 3 of the finished product with different diameters is completed. At this time, the front die 6 and the rear die 7 come into contact with the die stopper 9 and stop the jaw 12 at the same time. Next, the rear thin-walled portion of the finished pipe with different diameters is formed.
First, when the bolt 10 is removed in the state shown in FIG. 4e, and then the jaw 12 is pulled forward, the original tube 14 is formed by the rear die 7 and the plug 8 and has a thin rear wall, as shown in FIG. 4f. 2', and the already formed thick part 3 pushes the front die 6 out of the die stand 4. Since the extruded front die 6 is divided, it can be easily removed from the finished product different diameter tube 1 as shown in FIG. 4g. Further, the jaw 12 is pulled forward to pull out the original tube 14 between the rear die 7 and the plug 8, and the forming of the different diameter tube 1 is completed. In addition, when molding a tube with different diameters having multiple thick-walled parts 3, the rear thin-walled part 2' is formed as shown in Fig. 4g.
After forming a length shorter than the required length of the intermediate thin section by the length of the die trough, as shown in FIG.
Attach to. Next, the rear end of the plug rod 13 is unfixed, the jaw 12 is moved rearward, and the tube, front die 6, rear die 7, and plug 8 are integrally moved rearward inside the die stand 4 as shown in Fig. 5b. Attach distance piece 5.
Next, pull the jyo 12 forward and pull out the plug 8 together with the original tube 14 as shown in Fig. 5c, and when the positional relationship between the plug 8 and the front die 6 becomes as shown in Fig. 4b, the jyo 12 is pulled out. Stop and fix the rear end of the plug rod 13. Next, remove the distance piece 5 and pull the Jyo 12 forward. Then, the thick-walled portion 3 of the finished tube with different diameters is formed in the same manner as shown in FIG. 4d. Thereafter, the rear thin wall portion is formed in the same manner as in FIG. 4 e, f, and g. In this way, Figure 4 a~
Following each step in f, Fig. 5 a to c, Fig. 4 d to f
By repeating each step, a pipe of different diameters having a plurality of thick-walled parts can be manufactured. If the thick wall part of the finished pipe with different diameters is long, the die valley must be made wider and the drawing distance from c to e in Figure 4 must be made longer. In this case, the distance piece 5 can be made thicker, but if the increased weight makes installation and removal difficult, the distance piece 5 can be made thicker.
As shown in the figure, a notch 21 is provided at the tip of the rear die 7 on the side of the die stand 4 so that the distance d between the die stopper 9 and the rear die 7 is equal to the length of the thick part (including the tapered part). Bye. The different diameter tubes manufactured as described above have different mechanical properties such as hardness because the processing rate is different between the thin and thick parts, which may cause problems depending on the application. In such a case, the material can be made uniform in the following manner using the method of the present invention. That is, first, an intermediate variable diameter tube having a diameter larger than that of the finished variable diameter tube, a thin wall portion, and a thick wall portion is drawn from the original tube having a uniform wall thickness as shown in FIG. 4, and then this is annealed. Furthermore, the annealed intermediate tube with different diameters is used as a master tube and is pulled out as shown in FIG. At this time,
The thin-walled portion and thick-walled portion of the intermediate different-diameter tube are used as the thin-walled portion and thick-walled portion of the finished different-diameter tube, respectively, and the inner diameter and thin-walled portion of the intermediate different-diameter tube are , determine the size of the thick part. Note that if the intermediate pipe with different diameters is drawn in two or three stages, the material of each part of the finished pipe with different diameters will be made more homogeneous. Examples Different diameter tubes having an inner diameter of 40.6 mm, a wall thickness of the thin wall portion of 1.2 mm, and a wall thickness of the thick wall portion of 2.0 mm were manufactured using the methods shown in Table 1 using ausnitic stainless steel tubes as original tubes. Incidentally, Table 1 C (conventional method) is a product manufactured by a conventional method known from Japanese Patent Publication No. 52-471.
【表】
製造した成品異径管の断面肉厚中心部の硬さの
長さ方向分布を第7図に示す。同図から明らかな
ように、本発明法によれば薄肉部と厚肉部の硬さ
の差が小さく、特に3段引抜を行つたAは、長さ
方向にほゞ均一な硬さが得られている。なお、本
発明法Aは左側の薄肉部が前方薄肉部であり、本
発明法Bは右側の薄肉部が前方薄肉部である。
A,Bにおいて、前方薄肉部が後方薄肉部よりも
硬さが僅かに高いのは、第4図bのように、前方
薄肉部では後方ダイスにより空引きされて一度細
径管になるためである。しかし、この程度の僅小
な硬度差は実用上問題にならない。
以上のように、本発明法によれば内径が一定で
外径が部分的に異なる異径管を歩留よく寸法精度
よく成形でき、必要に応じて厚肉部を複数有する
異径管も成形でき、さらに引抜を2〜3段行うこ
とにより薄肉部と厚肉部の機械的性質の差をなく
すことができる。[Table] Figure 7 shows the longitudinal distribution of hardness at the center of the cross-sectional wall thickness of the manufactured product with different diameters. As is clear from the figure, according to the method of the present invention, the difference in hardness between the thin-walled part and the thick-walled part is small, and in particular, A, which was drawn in three stages, has almost uniform hardness in the length direction. It is being In addition, in the method A of the present invention, the thin part on the left side is the front thin part, and in the method B of the present invention, the thin part on the right side is the thin part at the front.
In A and B, the reason why the front thin wall part is slightly higher in hardness than the rear thin wall part is because the front thin wall part is emptied by the rear die and becomes a small diameter tube, as shown in Figure 4b. be. However, such a small difference in hardness does not pose a practical problem. As described above, according to the method of the present invention, different diameter tubes with a constant inner diameter and partially different outer diameters can be formed with good yield and dimensional accuracy, and if necessary, different diameter tubes with multiple thick-walled parts can also be formed. Furthermore, by performing drawing in two or three stages, the difference in mechanical properties between the thin-walled portion and the thick-walled portion can be eliminated.
第1図は本発明法により成形する異径管の一例
を示す図、第2図、第3図、第6図は本発明法を
行うための装置例を示す図、第4図、第5図は本
発明法の各成形工程を示す図、第7図は実施例の
硬さ分布を示す図である。
1:異径管、2:異径管薄肉部、3:異径管厚
肉部、4:ダイスタンド、5:デイスタンスピー
ス、6:前方ダイス、7:後方ダイス、8:プラ
グ、9:ダイストツパー、10:ボルト、11:
ボルト、12:ジヨー、13:プラグロツド、1
4:原管、15:口付け部、16:前方ダイスベ
アリングランド、17:後方ダイスベアリングラ
ンド、18:ダイス谷部、19:プラグ平行部、
20:プラグテーパー部、21:後方ダイス先端
切欠き。
FIG. 1 is a diagram showing an example of a tube of different diameter formed by the method of the present invention, FIGS. 2, 3, and 6 are diagrams showing examples of an apparatus for carrying out the method of the present invention, and FIGS. The drawings are diagrams showing each molding step of the method of the present invention, and FIG. 7 is a diagram showing the hardness distribution of the example. 1: Different diameter pipe, 2: Thin wall part of different diameter pipe, 3: Thick wall part of different diameter pipe, 4: Die stand, 5: Distance piece, 6: Front die, 7: Back die, 8: Plug, 9: Daistopper, 10: Bolt, 11:
Bolt, 12: Jiyo, 13: Plug rod, 1
4: Original pipe, 15: Mouth part, 16: Front die bearing land, 17: Back die bearing land, 18: Die valley, 19: Plug parallel part,
20: Plug taper part, 21: Rear die tip notch.
Claims (1)
製造において、該異径管の厚肉部と同一形状同一
寸法の谷部を有するスライド可能な分割型2段ダ
イスと、平行部および後部にテーパー部を有する
プラグとの間に管を通し、 イ 前記2段ダイスの前方ダイスと前記プラグの
平行部により管内を圧下する前方薄肉部成形工
程 ロ 前記2段ダイスをスライドさせつつ該ダイス
の谷部に管内を充満させる厚肉部成形工程 ハ 前記2段ダイスを前方ダイスおよび後方ダイ
スに分割し、該後方ダイスと前記プラグの平行
部により管肉を圧下する後方薄肉部成形工程を
順に行うことを特徴とする異径管の製造方法。 2 後方薄肉部成形終了後にダイスを2段ダイス
とし、該2段ダイスをスライドさせつつ該ダイス
の谷部に管肉を充満させる厚肉部成形工程を行
い、ついで前記2段ダイスを前方ダイスおよび後
方ダイスに分割し、該後方ダイスとプラグの平行
部により管肉を圧下する薄肉部成形工程を行い複
数の厚肉部を有する異径管を製造することを特徴
とする特許請求の範囲第1項記載の異径管の製造
方法。 3 冷間にて成形し、焼鈍した異径管の薄肉部に
前方薄肉部成形工程を施こし、該異径管の厚肉部
に厚肉部成形工程を施こし、該異径管の他の薄肉
部に後方薄肉部成形工程を施こすことを特徴とす
る特許請求の範囲第1項または第2項記載の異径
管の製造方法。[Scope of Claims] 1. In the production of different diameter tubes with a constant inner diameter and partially different outer diameters, a slidable split-type two-stage structure having a trough portion having the same shape and size as the thick wall portion of the different diameter tube. A tube is passed between the die and a plug having a parallel portion and a tapered portion at the rear, and (a) a front thin-walled portion forming process in which the inside of the tube is rolled down by the front die of the two-stage die and the parallel portion of the plug; (b) the two-stage die A thick-walled part forming process in which the tube is filled in the valley part of the die while sliding the die.C) The two-stage die is divided into a front die and a rear die, and the rear die is compressed by the parallel part of the rear die and the plug. A method for manufacturing a pipe of different diameters, characterized by sequentially performing thin-walled portion forming steps. 2. After forming the rear thin-walled part, the die is changed to a two-stage die, and a thick-walled part forming process is performed in which the valley part of the die is filled with pipe wall while sliding the two-stage die, and then the two-stage die is replaced with the front die and Claim 1, characterized in that the tube is divided into rear dies, and a thin-walled section forming process is performed in which the tube wall is rolled down by the parallel portions of the rear dies and the plug, to produce a tube of different diameters having a plurality of thick-walled sections. 2. Method for manufacturing pipes with different diameters as described in Section 1. 3. A front thin-walled part forming process is performed on the thin-walled part of the cold-formed and annealed different-diameter pipe, a thick-walled part-formed process is performed on the thick-walled part of the different-diameter pipe, and the other parts of the different-diameter pipe are subjected to a thin-walled part forming process. 3. The method for manufacturing a different diameter tube according to claim 1 or 2, characterized in that a rear thin-walled portion forming step is performed on the thin-walled portion of the tube.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP19081281A JPS5893512A (en) | 1981-11-30 | 1981-11-30 | Manufacture of different-diameter tube |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP19081281A JPS5893512A (en) | 1981-11-30 | 1981-11-30 | Manufacture of different-diameter tube |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5893512A JPS5893512A (en) | 1983-06-03 |
JPS6312692B2 true JPS6312692B2 (en) | 1988-03-22 |
Family
ID=16264153
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP19081281A Granted JPS5893512A (en) | 1981-11-30 | 1981-11-30 | Manufacture of different-diameter tube |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5893512A (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP5430159B2 (en) * | 2009-01-28 | 2014-02-26 | 日新製鋼株式会社 | Manufacturing method of different diameter steel pipe |
CN114226477B (en) * | 2021-10-27 | 2024-06-25 | 首都航天机械有限公司 | Automatic drawing forming device for spray pipe bundles |
-
1981
- 1981-11-30 JP JP19081281A patent/JPS5893512A/en active Granted
Also Published As
Publication number | Publication date |
---|---|
JPS5893512A (en) | 1983-06-03 |
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