JPH0411618B2 - - Google Patents
Info
- Publication number
- JPH0411618B2 JPH0411618B2 JP60206326A JP20632685A JPH0411618B2 JP H0411618 B2 JPH0411618 B2 JP H0411618B2 JP 60206326 A JP60206326 A JP 60206326A JP 20632685 A JP20632685 A JP 20632685A JP H0411618 B2 JPH0411618 B2 JP H0411618B2
- Authority
- JP
- Japan
- Prior art keywords
- product
- shape memory
- cylindrical
- deep drawing
- memory alloy
- 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
- Non-Disconnectible Joints And Screw-Threaded Joints (AREA)
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、例えば管の継手や締付け用部品、あ
るいはシール用部品として使用される形状記憶合
金を用いた筒状製品とその製造方法に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a cylindrical product using a shape memory alloy, which is used, for example, as a pipe joint, a fastening part, or a sealing part, and a method for manufacturing the same.
形状記憶合金は例えばTiNi合金やCuZnAl合金
などであるが、これらはいずれも押出し、あるい
は引抜き等の塑性加工によつて管を作ることが困
難である。このため従来は、例えば管継手などに
用いる筒状の形状記憶合金製品を得る場合、次の
ような方法が行なわれている。
Shape memory alloys include, for example, TiNi alloys and CuZnAl alloys, but it is difficult to make tubes from any of these through plastic working such as extrusion or drawing. For this reason, conventionally, when obtaining a cylindrical shape memory alloy product used for, for example, a pipe joint, the following method has been used.
熱間鍛造等により丸棒を製作し、この丸棒を
バイトやドリルで切削加工することにより、筒
状とし、そののち形状記憶処理を行なう。 A round bar is manufactured by hot forging, etc., and this round bar is cut into a cylindrical shape using a cutting tool or a drill, and then shape memory treatment is performed.
所定の変態点となるような組成の金属粉末を
用い、粉末治金法によつて筒状に成形したの
ち、形状記憶熱処理を行なう。 Metal powder having a composition that provides a predetermined transformation point is used to form a cylinder into a cylinder by powder metallurgy, and then undergoes shape memory heat treatment.
形状記憶合金製の薄板材を円筒状にフオーミ
ングしたのち、その突合わせ部分を溶接する。 After forming a thin sheet material made of shape memory alloy into a cylindrical shape, the butt parts are welded.
しかしながら上記の方法では、切削によるた
め高価な形状記憶合金の材料歩留りがきわめて悪
くなり、しかも加工に手間が掛るなどの問題があ
り、量産に向かない。
However, the above method has problems such as extremely poor material yield of expensive shape memory alloys due to cutting, and requires time and effort for processing, and is not suitable for mass production.
一方、の方法では材料組織が不均一になりや
すく、局部的な変態点のずれや結晶粒の粗大化、
不純物の混入、気孔の存在などによる形状記憶特
性の劣化が考えられる。また、TiNi合金などは、
冷間加工度が大きいほど形状記憶特性（形状回復
力、温度ヒステリシス）が優れるが、上記，
の方法では冷間加工をほとんど施すことができな
いため、形状記憶特性が劣る。そして，の方
法とも極薄肉円筒の成形が不可能に近い。 On the other hand, with method 2, the material structure tends to become non-uniform, resulting in local shifts in the transformation point, coarsening of crystal grains,
Deterioration of shape memory properties is thought to be due to contamination of impurities, presence of pores, etc. In addition, TiNi alloy etc.
The higher the degree of cold working, the better the shape memory properties (shape recovery force, temperature hysteresis).
With this method, almost no cold working can be performed, so the shape memory properties are poor. Both methods are nearly impossible to form extremely thin-walled cylinders.
またの方法では、溶接に伴う品質と形状記憶
の劣化が問題であり、安定した製品が得られな
い。 In the other method, there is a problem of deterioration of quality and shape memory due to welding, and a stable product cannot be obtained.
本発明による形状記憶合金を用いた筒状製品
は、形状記憶合金からなりかつ筒状に成形される
過程で、筒部が深絞りによつてその軸方向に圧延
されていることを特徴とするものである。この明
細書でいう「軸方向に圧延」とは、深絞り時に材
料が筒部の軸方向に引伸ばされつつ強加工が行な
われることをいう。筒状の形状記憶合金がこのよ
うな方向の強加工を受けることにより、深絞り方
向と直交する方向の形状記憶効果が大きくとれる
ような組織の異方性が得られる。なお本発明は、
有底カツプ状の筒状製品にも適用できるし、底を
切り落とした筒状製品にも適用できる。
The cylindrical product using a shape memory alloy according to the present invention is made of a shape memory alloy, and is characterized in that the cylindrical part is rolled in the axial direction by deep drawing during the process of being formed into a cylindrical shape. It is something. In this specification, "rolling in the axial direction" means that during deep drawing, the material is stretched in the axial direction of the cylindrical portion and subjected to strong working. By subjecting the cylindrical shape memory alloy to strong working in such a direction, anisotropy of the structure can be obtained such that the shape memory effect in the direction perpendicular to the deep drawing direction is large. Note that the present invention
It can be applied to cup-shaped cylindrical products with a bottom, as well as cylindrical products with the bottom cut off.
また本発明方法は、形状記憶合金からなる板状
素材に深絞り加工を行なつてカツプ状の中間製品
を得、そののちこの中間製品の底を切り落として
筒状の製品とすることを特徴とする製造方法であ
る。なお、必要に応じて上記深絞り加工に続いて
軸方向にしごき加工が行なわれる。 Further, the method of the present invention is characterized in that a cup-shaped intermediate product is obtained by deep drawing a plate-shaped material made of a shape memory alloy, and then the bottom of this intermediate product is cut off to obtain a cylindrical product. This is the manufacturing method. Note that, if necessary, ironing is performed in the axial direction following the deep drawing described above.
本発明によつて得られた形状記憶合金製の筒状
製品は、冷間で軸方向に強加工を受けているた
め、下記実施例中に詳述されるように、深絞り時
における圧延方向（深絞り方向）と直角な方向、
すなわち、製品の円周方向の形状記憶特性が優れ
ている。このため母相温度域で円周方向に大きな
締付け力が得られる。
Since the shape memory alloy cylindrical product obtained by the present invention has been subjected to strong cold working in the axial direction, as will be detailed in the examples below, (deep drawing direction) and perpendicular direction,
That is, the product has excellent shape memory characteristics in the circumferential direction. Therefore, a large tightening force can be obtained in the circumferential direction in the matrix temperature range.
（実施例）
一例として、CuZnAl合金を用いた形状記憶合
金製の円板状素材（ブランク）を用意する。この
板状素材を、第１図に図示されるようなダイス１
０とポンチ１１および皺押え１２を用いて、深絞
り加工を行なう。ポンチ１１は円柱または円筒状
をなしている。この深絞り加工によつて得られた
中間製品A′は、筒状に成形される過程で筒部の
軸方向に強加工を受け、底にあるカツプないしハ
ツト状となる。(Example) As an example, a disk-shaped material (blank) made of a shape memory alloy using a CuZnAl alloy is prepared. This plate material is cut into a die 1 as shown in FIG.
Deep drawing is performed using a punch 11 and a wrinkle presser 12. The punch 11 has a columnar or cylindrical shape. The intermediate product A' obtained by this deep drawing process is subjected to strong processing in the axial direction of the cylindrical part during the process of being formed into a cylindrical shape, so that it becomes a cup or a hat shape at the bottom.
以上の深絞り加工において、加工前の素材の直
径をＤ、ポンチ１１の外径をｄとした場合、１回
で絞り込める量すなわち限界絞り比Ｄ／ｄは約
2.0以下である。この深絞り加工は、後述するよ
うにダイス径を次第に小さくして複数回行なわれ
る。 In the above deep drawing process, if the diameter of the material before processing is D and the outer diameter of the punch 11 is d, the amount that can be drawn in one step, that is, the limit drawing ratio D/d is approximately
2.0 or less. This deep drawing process is performed multiple times by gradually reducing the die diameter, as will be described later.
所定の深絞り加工が行なわれたのち、しごき加
工が行なわれる。すなわち第２図に示されるよう
に、中間製品A′の筒部はダイス１５とポンチ１
６との間で軸方向にしごかれる。こうして中間製
品A′は軸方向に圧延され、径が小さくなりつつ
肉厚が減少する。しごき加工中は、中間製品
A′に皺が発生することを防止するために皺押え
１７が用いられる。 After a predetermined deep drawing process is performed, ironing process is performed. That is, as shown in FIG. 2, the cylindrical part of the intermediate product A' is
6 in the axial direction. In this way, the intermediate product A' is rolled in the axial direction, and its diameter and wall thickness are reduced. During the ironing process, intermediate products
A wrinkle presser 17 is used to prevent wrinkles from forming on A'.
一例として、前記深絞り加工は第１から第４ま
での４段階の工程にわたつて行なわれ、しごき加
工は深絞り加工の終了後に、２段階にわたつて行
なわれる。 As an example, the deep drawing process is performed in four stages from the first to the fourth process, and the ironing process is performed in two stages after the deep drawing process is completed.
例えば素材の板厚ｔが0.5mmで外径Ｄが42mmの
場合、深絞り加工の第１〜第４工程では、ダイス
径が25mm→22mm→18.7mm→15.9mmと減少させられ
る。一方、しごき加工の第１〜第２工程では、ダ
イス径は15.8mm→15.6mmと変化させられる。この
場合、出来上がつたカツプ状の中間製品A′（第３
図）は、外径15.6mm、板厚0.23mm、軸方向の長さ
が66mmである。 For example, when the plate thickness t of the material is 0.5 mm and the outer diameter D is 42 mm, the die diameter is reduced from 25 mm to 22 mm to 18.7 mm to 15.9 mm in the first to fourth steps of deep drawing. On the other hand, in the first and second steps of ironing, the die diameter is changed from 15.8 mm to 15.6 mm. In this case, the finished cup-shaped intermediate product A′ (third
Figure) has an outer diameter of 15.6 mm, a plate thickness of 0.23 mm, and an axial length of 66 mm.
以上のように、深絞り加工としごき加工を適宜
回数行なう場合、加工の繰返しにより縁割れが生
じる場合には、加工の間に中間焼鈍を実施する。
中間焼鈍は、例えば550℃の温度で20分間行なわ
れ、焼鈍によつて素材の加工硬化が除去される。 As described above, when deep drawing and ironing are performed an appropriate number of times, if edge cracking occurs due to repeated processing, intermediate annealing is performed between the processing.
Intermediate annealing is performed at a temperature of, for example, 550° C. for 20 minutes, and work hardening of the material is removed by annealing.
以上の工程を経てカツプ状に成形された中間製
品A′は、底ａが切り落とされることにより、第
４図に示されるような円筒状の製品Ａが得られ
る。そして所望の形状記憶熱処理が行なわれる。 The intermediate product A' formed into a cup shape through the above steps is cut off at the bottom a to obtain a cylindrical product A as shown in FIG. A desired shape memory heat treatment is then performed.
製品Ａは、一例として第５図に示されるよう
に、管２０，２１を連結するための継手として使
用できる。この場合、製品Ａの内径は管２０，２
１の外径よりもやや小さい寸法に仕上げられ、か
つ形状記憶熱処理されている。そして連結に際
し、製品Ａをマルテンサイト温度まで冷却した状
態で拡管して挿入し、挿入後に母相温度に上昇さ
せればよい。 Product A can be used as a joint for connecting pipes 20 and 21, as shown in FIG. 5 by way of example. In this case, the inner diameter of product A is the tube 20, 2
It is finished to a size slightly smaller than the outer diameter of No. 1, and is heat-treated with shape memory. When connecting, product A may be expanded and inserted after being cooled to the martensite temperature, and after insertion, the temperature may be raised to the matrix temperature.
なお、上述した中間製品A′をスリツト加工な
どにより輪切りにして、複数個のリング（短筒
状）の製品Ａを得るようにしてもよい。こうした
リング状の製品Ａの場合には、例えばパイプの継
目のシール材として好適である。あるいは第６図
に示される使用例のように、管２０，２１を連結
する管継手２３をその外側から締付ける部品とし
て好適である。但し、これら以外の用途にも勿論
使用できる。また、必要に応じてリング状の製品
Ａの内面を様々な形状に加工してもよい。 Note that the above-mentioned intermediate product A' may be cut into rings by slitting or the like to obtain a plurality of ring (short cylindrical) products A. In the case of such a ring-shaped product A, it is suitable as a sealing material for pipe joints, for example. Alternatively, as in the usage example shown in FIG. 6, it is suitable as a component for tightening the pipe joint 23 connecting the pipes 20 and 21 from the outside. However, it can of course be used for purposes other than these. Further, the inner surface of the ring-shaped product A may be processed into various shapes as necessary.
上記方法により製作される形状記憶合金製の筒
状製品Ａは、冷間で軸方向に強加工を受ける。こ
のため、深絞り加工前に既に冷間圧延されている
板状素材は、深絞り加工されて筒状製品Ａとなる
加工率が増大し、特に深絞り時における圧延方向
（深絞り方向）と直交する方向の形状記憶特性が
向上する。すなわち円周方向の締付け力と形状回
復力が大きくなる。 The shape memory alloy cylindrical product A manufactured by the above method is subjected to severe cold working in the axial direction. For this reason, the processing rate of the sheet material that has already been cold rolled before deep drawing increases to become the cylindrical product A, and especially in the rolling direction (deep drawing direction) during deep drawing. Shape memory properties in orthogonal directions are improved. In other words, the tightening force and shape recovery force in the circumferential direction become larger.
第７図ないし第９図は、Ti含有率が49.4at％
TiNi合金を用いた形状記憶合金の引張り試験結
果を示す。この試料は、熱間圧延および冷間圧延
後の焼鈍材である。第７図は母相（オーステナイ
ト）温度におけるひずみと応力との関係を、圧延
方向と圧延方向に対し直角の方向とに分けて示し
ている。第８図はマルテンサイト温度（低温度
域）におけるひずみと応力の関係である。マルテ
ンサイト温度と母相温度における応力比較から形
状回復力（第９図）を見ると、圧延方向（第４図
において矢印f1方向）に対して直交する方向のf2
の形状記憶特性が最も優れている。すなわち、本
実施例のように深絞り時に軸方向に圧延された筒
状製品Ａにおいては、その円周方向の形状回復力
すなわち締付け力が最も増大する。 In Figures 7 to 9, the Ti content is 49.4 at%.
The results of a tensile test of a shape memory alloy using a TiNi alloy are shown. This sample is an annealed material after hot rolling and cold rolling. FIG. 7 shows the relationship between strain and stress at the parent phase (austenite) temperature, divided into the rolling direction and the direction perpendicular to the rolling direction. FIG. 8 shows the relationship between strain and stress at martensite temperature (low temperature range). Looking at the shape recovery force (Fig. 9) from stress comparison at martensite temperature and matrix temperature, f 2 in the direction perpendicular to the rolling direction (arrow f 1 direction in Fig. 4)
has the best shape memory properties. That is, in the cylindrical product A rolled in the axial direction during deep drawing as in this embodiment, the shape recovery force in the circumferential direction, that is, the tightening force increases the most.
本実施例方法により製作された筒状製品Ａと、
従来の切削加工により製作された筒状製品の円周
方向の締結力を比較したところ、本実施例方法に
よれば深絞り加工としごき加工時の減面率にもよ
るが、従来と比較して約２倍ないし４倍の締結力
が得られることが判つた。そして、締付け力が増
大したことにより従来品に比べて薄肉化が可能と
なり、高価な形状記憶合金の使用量を減らすこと
ができる。 A cylindrical product A manufactured by the method of this embodiment,
A comparison of the circumferential fastening force of cylindrical products manufactured by conventional cutting revealed that, although it depends on the area reduction rate during deep drawing and ironing, the method of this example has a higher It was found that approximately twice to four times the fastening force could be obtained. In addition, the increased tightening force allows the product to be made thinner than conventional products, and the amount of expensive shape memory alloy used can be reduced.
なお、本実施例以外の種類のCu系およびNiTi
系、その他の形状記憶合金についても各工程での
減面率および中間焼鈍等を適宜選定することによ
り、上記実施例と同等の筒状製品が得られ、その
締付け力についても実施例とほぼ同等の効果が得
られた。 In addition, types of Cu-based and NiTi other than those in this example
By appropriately selecting the area reduction rate and intermediate annealing in each process for other shape memory alloys, a cylindrical product similar to that of the above example can be obtained, and its tightening force is also approximately the same as that of the example. The effect was obtained.
なお、本発明の筒状製品は円筒に限らない。例
えば第１０図に示されるような異形断面であつて
もよい。また、第１１図に示される段付きパイプ
や、第１２図に示されるように管軸方向に肉厚の
変化する形状に加工されてもよい。 Note that the cylindrical product of the present invention is not limited to a cylinder. For example, it may have an irregular cross section as shown in FIG. Further, it may be processed into a stepped pipe as shown in FIG. 11 or a shape in which the wall thickness changes in the pipe axis direction as shown in FIG. 12.
更に第１３図に示されるようなテーパ付きのパ
イプや、第１４図の如き屈曲したパイプであつて
もよい。 Furthermore, a tapered pipe as shown in FIG. 13 or a bent pipe as shown in FIG. 14 may be used.
本発明によれば特に円周方向の形状回復力が他
の方向よりも大きな、異方性をもつ筒状製品が得
られ、かつ締付力も従来品よりも大きくすること
ができ従つて管継手など円周方向の締付け力を利
用する用途にきわめて効果的である。しかも切削
によらないため、歩留りが高く、かつ加工に手数
が掛らないので量産に適する。そして板厚のきわ
めて薄い製品も容易に得ることができる。
According to the present invention, it is possible to obtain an anisotropic cylindrical product in which the shape recovery force in the circumferential direction is larger than in other directions, and the tightening force can also be increased compared to conventional products. It is extremely effective for applications that utilize tightening force in the circumferential direction. Moreover, since it does not involve cutting, it has a high yield and requires no processing time, making it suitable for mass production. Furthermore, products with extremely thin plates can be easily obtained.
第１図は深絞り加工を説明するための略断面
図、第２図はしごき加工を説明するための略断面
図、第３図は中間製品の縦断面図、第４図は筒状
製品の縦断面図、第５図は筒状製品の使用状態を
示す側面図、第６図はリング状の筒状製品の使用
状態を示す側面図、第７図は母相温度でのひずみ
と応力の関係を示す図、第８図はマルテンサイト
温度でのひずみと応力の関係を示す図、第９図は
圧延方向と形状回復力の関係を示す図、第１０図
は本発明の他の実施例を示す筒状製品の横断面
図、第１１図ないし第１４図はそれぞれ本発明の
互いに異なる実施例を示す筒状製品の縦断面図で
ある。
Ａ……筒状製品、A′……中間製品。
Fig. 1 is a schematic sectional view to explain deep drawing processing, Fig. 2 is a schematic sectional view to explain ladder processing, Fig. 3 is a longitudinal sectional view of an intermediate product, and Fig. 4 is a schematic sectional view of a cylindrical product. Fig. 5 is a side view showing how the cylindrical product is used, Fig. 6 is a side view showing how the ring-shaped cylindrical product is used, and Fig. 7 shows the strain and stress at the matrix temperature. Figure 8 is a diagram showing the relationship between strain and stress at martensite temperature, Figure 9 is a diagram showing the relationship between rolling direction and shape recovery force, and Figure 10 is another example of the present invention. FIGS. 11 to 14 are longitudinal sectional views of the cylindrical product showing different embodiments of the present invention, respectively. A...Tubular product, A'...Intermediate product.
Claims (1)
に、筒状に成形される過程で筒部が深絞りによつ
てその軸方向に圧延されていることを特徴とする
形状記憶合金を用いた筒状製品。 ２ 形状記憶合金からなる板状素材に深絞り加工
を行なつてカツプ状の中間製品を得、そののちこ
の中間製品の底を切り落として筒状の製品とする
ことを特徴とする形状記憶合金を用いた筒状製品
の製造方法。 ３ 上記深絞り加工を限界絞り比2.0以下で行な
うことを特徴とする特許請求の範囲第２項記載の
形状記憶合金を用いた筒状製品の製造方法。 ４ 上記深絞り加工に続いて軸方向のしごき加工
を行なうようにし、これら深絞り加工としごき加
工を適宜の回数行なうことによつて上記中間製品
を得ることを特徴とする特許請求の範囲第２項記
載の形状記憶合金を用いた筒状製品の製造方法。 ５ 上記深絞り加工としごき加工を繰返す間に中
間焼鈍を行なうことを特徴とする特許請求の範囲
第４項記載の形状記憶合金を用いた筒状製品の製
造方法。 ６ 上記中間製品を得たのち、更にこの中間製品
を輪切りにすることによりリング状の製品を得る
ことを特徴とする特許請求の範囲第４項記載の形
状記憶合金を用いた筒状製品の製造方法。[Scope of Claims] 1. A shape memory device made of a shape memory alloy and having a cylindrical shape, and characterized in that the cylindrical portion is rolled in the axial direction by deep drawing during the process of being formed into the cylindrical shape. A cylindrical product made of alloy. 2. A shape memory alloy characterized by performing deep drawing on a plate-shaped material made of a shape memory alloy to obtain a cup-shaped intermediate product, and then cutting off the bottom of this intermediate product to make a cylindrical product. The manufacturing method of the cylindrical product used. 3. A method for manufacturing a cylindrical product using a shape memory alloy according to claim 2, characterized in that the deep drawing is performed at a critical drawing ratio of 2.0 or less. 4. The second aspect of the present invention is characterized in that the deep drawing process is followed by axial ironing process, and the intermediate product is obtained by performing the deep drawing process and ironing process an appropriate number of times. A method for manufacturing a cylindrical product using the shape memory alloy described in . 5. The method for manufacturing a cylindrical product using a shape memory alloy according to claim 4, characterized in that intermediate annealing is performed while the deep drawing and ironing are repeated. 6. Manufacture of a cylindrical product using a shape memory alloy according to claim 4, characterized in that after obtaining the intermediate product, a ring-shaped product is obtained by further slicing the intermediate product into rings. Method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20632685A JPS6267159A (en) | 1985-09-20 | 1985-09-20 | Tubular product made of shape memory alloy and its production |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20632685A JPS6267159A (en) | 1985-09-20 | 1985-09-20 | Tubular product made of shape memory alloy and its production |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6267159A JPS6267159A (en) | 1987-03-26 |
| JPH0411618B2 true JPH0411618B2 (en) | 1992-03-02 |
Family
ID=16521441
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP20632685A Granted JPS6267159A (en) | 1985-09-20 | 1985-09-20 | Tubular product made of shape memory alloy and its production |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6267159A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01295092A (en) * | 1988-05-23 | 1989-11-28 | Nippon Steel Corp | Shape memory alloy-made joint for pipes of different outside diameter |
| JPH0332282U (en) * | 1989-08-09 | 1991-03-28 |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS55112139A (en) * | 1979-02-21 | 1980-08-29 | Sukai Alum Kk | Production of rim for tyre wheel |
| JPS58128516A (en) * | 1982-01-27 | 1983-08-01 | 中越合金鋳工株式会社 | Method of clamping clamping part made of brass group form memory alloy |
| JPS59170246A (en) * | 1983-03-15 | 1984-09-26 | Tohoku Metal Ind Ltd | Production of titanium nickel alloy parts having reversible shape memory effect |
| JPS6075562A (en) * | 1983-09-30 | 1985-04-27 | Tohoku Metal Ind Ltd | Reversible shape memory pipe joint |
-
1985
- 1985-09-20 JP JP20632685A patent/JPS6267159A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6267159A (en) | 1987-03-26 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| KR960003899B1 (en) | Method for manufacturing tubular bodies | |
| JP3242521B2 (en) | Manufacturing method of titanium alloy ring | |
| JPH0411618B2 (en) | ||
| JP2000015326A (en) | Die for Cu hot extrusion and method for producing the same | |
| JP5387797B1 (en) | Seamless steel pipe manufacturing method | |
| JP2768849B2 (en) | Grain refining method for non-magnetic steel cylindrical forgings | |
| JPS60141823A (en) | Production of nonmagnetic steel working member | |
| JPH086160B2 (en) | Method for manufacturing conical tubular member | |
| DE1802430A1 (en) | Process for making cylindrical or rod-shaped composite material | |
| JPS61132241A (en) | Production of ring | |
| JPS62236676A (en) | Manufacture of single head l-shaped wheel nut wrench | |
| JP2001047127A (en) | Manufacture of intermediate drawn tube | |
| EP1375019B1 (en) | Thick-walled small diameter pipe producing method | |
| JPS58209441A (en) | Forging method of ring | |
| JP2006289394A (en) | Method for producing ring made of Mn-Cu alloy | |
| JPS613614A (en) | Manufacture of shape memory alloy | |
| US618165A (en) | Island | |
| SU620298A1 (en) | Method of manufacturing polymetal semi-finished products | |
| EP1379341B1 (en) | Method of manufacturing a closed profile | |
| UA62615A (en) | Method for equal-channel polygonal pressing of articles | |
| JPH0579401B2 (en) | ||
| DE890635C (en) | Process for the production of pipes from high-weight, in particular aluminum-Teftitic chromium-nickel steels | |
| JPS61190052A (en) | Manufacture of finned tube made of titanium | |
| JPS6281237A (en) | Manufacture of special form ring | |
| JPH02104404A (en) | Manufacture of titanium seamless tube |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |