JPH09295080A - Core metal for expanding diameter of ring and method for expanding diameter of ring using this - Google Patents
Core metal for expanding diameter of ring and method for expanding diameter of ring using thisInfo
- Publication number
- JPH09295080A JPH09295080A JP11632396A JP11632396A JPH09295080A JP H09295080 A JPH09295080 A JP H09295080A JP 11632396 A JP11632396 A JP 11632396A JP 11632396 A JP11632396 A JP 11632396A JP H09295080 A JPH09295080 A JP H09295080A
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- Japan
- Prior art keywords
- ring
- diameter
- expanding
- core metal
- expanded
- 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.)
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Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、アルミニウムまた
はアルミニウム合金等（以下、単にアルミ合金等とい
う）で形成されたリング状被拡径体を拡径するために使
用するリング拡径用芯金および該リング拡径用芯金を使
用してリング状被拡径体を拡径するリング拡径方法に関
するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ring-expanding core bar used for expanding a ring-shaped expandable body made of aluminum, aluminum alloy or the like (hereinafter simply referred to as aluminum alloy). The present invention relates to a ring diameter expanding method for expanding a ring-shaped diameter-expanded body by using the ring diameter expanding core metal.
【０００２】[0002]
【従来の技術】従来、アルミ合金等で形成されたリング
状被拡径体を拡径する方法として、円柱状のリング拡径
用芯金の外周にリング状被拡径体を配置し、該リング状
被拡径体を、プレスとリング拡径用芯金とで圧縮しなが
ら拡径用芯金の回りに回転させ、これによってリング状
被拡径体を拡径する方法が知られている。2. Description of the Related Art Conventionally, as a method of expanding a ring-shaped diameter-expanded body formed of an aluminum alloy or the like, a ring-shaped diameter-expansion body is arranged on the outer periphery of a cylindrical ring diameter-expansion core. A method is known in which a ring-shaped diameter-expanded object is rotated around the diameter-expansion core while being compressed by a press and a ring-expansion core, thereby expanding the ring-shaped diameter-expansion object. .
【０００３】このようなリング拡径方法においては、リ
ング状被拡径体の拡径の割合が小さくてよい場合は１個
のリング拡径用芯金のみの使用でよいが、リング状被拡
径体の拡径の割合を大きくする必要がある場合は、１個
のリング拡径用芯金のみの使用では、リング状被拡径体
がある程度拡径されてくると相対的にリング拡径用芯金
の外周面の曲率半径が小さい状態となるので、リング状
被拡径体をリング拡径用芯金の周りに回転させる際の回
転ピッチを大きくすることができず、このために作業効
率が悪化すると共にリング状被拡径体の真円度も悪くな
るという問題があった。In such a ring diameter expanding method, when only the ratio of the diameter expansion of the ring-shaped diameter-expanded body is small, it is sufficient to use only one ring diameter-expanding core metal. When it is necessary to increase the ratio of the diameter expansion of the diameter body, if only one ring diameter expansion core is used, when the ring-shaped diameter-enlarged body expands to a certain extent, the ring diameter expansion becomes relatively large. Since the radius of curvature of the outer peripheral surface of the core metal is small, it is not possible to increase the rotation pitch when rotating the ring-shaped diameter-expanded body around the ring diameter-increasing core metal. There is a problem that the efficiency deteriorates and the circularity of the ring-shaped diameter-expanded body also deteriorates.
【０００４】そこで従来は、曲率半径の異なる円柱状ま
たは半円柱状のリング拡径用芯金を複数個用意してお
き、リング状被拡径体の拡径がある程度まで進んだ段階
で、順次曲率半径の大きなリング拡径用芯金に交換して
リング状被拡径体を所定の径のリングに仕上げていた。Therefore, conventionally, a plurality of cylindrical or semi-cylindrical ring diameter-increasing cores having different radii of curvature have been prepared, and when the diameter of the ring-shaped diameter-enlarged body has reached a certain degree, the cores are sequentially expanded. The ring-shaped diameter-expanded body was finished into a ring having a predetermined diameter by replacing the ring diameter-increasing core bar with a large radius of curvature.
【０００５】[0005]
【発明が解決しようとする課題】しかしながら、上記の
ように曲率半径の異なる円筒型または半円筒型のリング
拡径用芯金を複数個使用すると、芯金の製作費が高価に
なると共にそれらを置くためのスペースも必要になると
いう問題があった。また芯金が大きくなると、その交換
作業の際に大型の重機やクレーンが必要となり交換作業
に長時間を要するという問題があった。更に、芯金を交
換している際にリング状被拡径体が冷えてしまうので、
芯金を交換する度にリング状被拡径体を再加熱しなけれ
ばならずその作業も面倒であるという問題があった。However, if a plurality of cylindrical or semi-cylindrical ring expanding cores having different radii of curvature are used as described above, the manufacturing cost of the core bar becomes high and the core bars are expensive. There was a problem that a space for placing it was also required. Further, when the core metal becomes large, there is a problem that a large heavy machine or a crane is required for the replacement work, which requires a long time for the replacement work. Furthermore, since the ring-shaped diameter-expanded body will cool during the replacement of the core bar,
There was a problem that the ring-shaped diameter-expanded body had to be reheated every time the core metal was replaced, and the work was troublesome.
【０００６】[0006]
【課題を解決するための手段】本発明は上記課題を解決
したリング拡径用芯金およびこのリング拡径用芯金を使
用したリング拡径方法を提供するものである。SUMMARY OF THE INVENTION The present invention provides a ring diameter-expanding core metal that solves the above problems and a ring diameter-expanding method using the ring diameter-expanding core metal.
【０００７】本発明に係るリング拡径用芯金は、円周方
向に、異なった曲率半径を持つ複数の曲面を形成したこ
とを特徴とするものである（請求項１）。The ring expanding core metal according to the present invention is characterized in that a plurality of curved surfaces having different radiuses of curvature are formed in the circumferential direction (claim 1).
【０００８】また本発明に係るリング拡径方法は、リン
グ拡径用芯金の外周にリング状被拡径体を配置し、該リ
ング状被拡径体をプレスとリング拡径用芯金とで圧縮し
ながら拡径用芯金の回りに回転させ、これによってリン
グ状被拡径体を拡径してなるリング拡径方法において、
リング拡径用芯金として円周方向に異なった曲率半径を
持つ複数の曲面を形成したリング拡径用芯金を使用し、
リング状被拡径体をプレスとリング拡径用芯金とで圧縮
して拡径する際、曲率半径の小さな曲面から曲率半径の
大きな曲面の順番で各曲面を順次プレス側に対向させる
ことを特徴とするリング拡径方法である（請求項２）。In the ring diameter expanding method according to the present invention, a ring-shaped diameter-expanded body is arranged on the outer circumference of the ring diameter-increased core, and the ring-shaped diameter-increased body is pressed with a ring diameter-increased core metal. In the ring diameter expanding method, in which the ring-shaped diameter-expanded body is expanded by rotating around the core metal for diameter expansion while compressing with,
As the core metal for ring expansion, use a core metal for ring expansion that has a plurality of curved surfaces with different radii of curvature in the circumferential direction.
When compressing and expanding the ring-shaped body to be expanded by the press and the core for expanding the ring, it is necessary to sequentially face each curved surface to the press side in order from the curved surface with the smallest radius of curvature to the curved surface with the largest radius of curvature. This is a characteristic method for expanding the diameter of the ring (claim 2).
【０００９】リング拡径用芯金の円周方向に、異なった
曲率半径を持つ複数の曲面を形成することによって、１
個のリング拡径用芯金で、曲率半径の異なる複数のリン
グ拡径用芯金を使用した場合と同様な作用をさせること
ができる。すなわち、リング状被拡径体をプレスとリン
グ拡径用芯金とで圧縮して拡径する際、まず曲率半径の
一番小さな曲面をプレスに対向させて固定し、かかる状
態でリング状被拡径体をプレスと曲率半径の小さな曲面
とで圧縮しながらリング拡径用芯金の回りに回転させ、
これによってリング状被拡径体をある値まで拡径する。
ある値まで拡径した後は、曲率半径が二番目に小さい曲
面をプレスに対向させて固定し、前記と同様にリング状
被拡径体をある値まで拡径する。以下順次同様に拡径作
業を行うことにより、リング状被拡径体を所定の径のリ
ングに仕上げることができる。By forming a plurality of curved surfaces having different radii of curvature in the circumferential direction of the core metal for expanding the ring diameter,
With a single ring diameter-expanding core metal, it is possible to perform the same operation as when a plurality of ring diameter-expanding core metals having different radii of curvature are used. That is, when the ring-shaped diameter-expanded body is compressed and expanded by the press and the ring-expansion core metal, first the curved surface with the smallest radius of curvature is opposed to the press and fixed, and in this state. Rotate the expanded body around the ring expansion core while compressing it with a press and a curved surface with a small radius of curvature.
As a result, the diameter of the ring-shaped body to be expanded is expanded to a certain value.
After the diameter is expanded to a certain value, the curved surface having the second smallest radius of curvature is opposed to the press and fixed, and the ring-shaped expanded body is expanded to a certain value in the same manner as described above. The ring-shaped diameter-expanded body can be finished into a ring having a predetermined diameter by successively performing the diameter-expansion work in the same manner.
【００１０】[0010]
【発明の実施の形態】以下、本発明を図面を参照して詳
細に説明する。図１（イ）（ロ）は本発明に係るリング
拡径用芯金の一実施の形態を示すもので、このリング拡
径用芯金Ａは、円周方向に、異なった曲率半径を持つ４
個の曲面１、２、３、４が形成してある。曲率半径の大
きさはＲ1 ＜Ｒ2 ＜Ｒ3 ＜Ｒ4となっている。この曲率
半径の大きさは、拡径すべきリング状被拡径体の拡径割
合に応じて適宜選定するものである。また、曲面１、
２、３、４の長さＬも適宜選定するものであり、この長
さは最大でプレスの長さと同じ長さにすることができ
る。DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the drawings. 1 (a) and (b) show an embodiment of a ring expanding core metal according to the present invention. The ring expanding core metal A has different curvature radii in the circumferential direction. Four
Curved surfaces 1, 2, 3, 4 are formed. The radius of curvature is R 1 <R 2 <R 3 <R 4 . The size of the radius of curvature is appropriately selected according to the diameter expansion ratio of the ring-shaped diameter-enlarged body to be expanded. Also, curved surface 1,
The lengths L of 2, 3, and 4 are also appropriately selected, and this length can be the same as the length of the press at the maximum.
【００１１】なお円周方向に異なった曲率半径を持つ曲
面の数は４面に限定されるものではなく、６面、８面、
１０面、１２面等であってもよい。例えば図２には６個
の曲面を形成したリング拡径用芯金が示してあり、この
６個の曲面の曲率半径は、Ｒ＜１．４Ｒ＜１．８Ｒ＜
２．２Ｒ＜２．６Ｒ＜３．０Ｒに形成してある。The number of curved surfaces having different radii of curvature in the circumferential direction is not limited to four, but six, eight,
It may be 10 faces, 12 faces, or the like. For example, FIG. 2 shows a ring expanding core metal having six curved surfaces, and the radius of curvature of these six curved surfaces is R <1.4R <1.8R <
It is formed so that 2.2R <2.6R <3.0R.
【００１２】上記の如く円周方向に異なった曲率半径を
持つ曲面を形成する際、円周方向に異なった曲率半径を
持つ曲面同志は滑らかなテーパで結ぶことが好ましく、
またバランス上から対面に曲率半径が近い曲面を配置す
るのが好ましい。When forming curved surfaces having different radii of curvature in the circumferential direction as described above, it is preferable to connect curved surfaces having different radii of curvature in the circumferential direction with a smooth taper,
Further, it is preferable to arrange curved surfaces having a curvature radius close to each other from the viewpoint of balance.
【００１３】次に上記のような、円周方向に異なった曲
率半径を持つ複数の曲面を形成したリング拡径用芯金を
使用してリング状被拡径体を拡径する場合について説明
する。図３に示す如く、リング拡径用芯金Ａは円周方向
に異なった曲率半径Ｒ1 ＜Ｒ 2 ＜Ｒ3 ＜Ｒ4 を持つ４個
の曲面が形成してある。このリング拡径用芯金Ａの外周
にリング状被拡径体Ｂを配置した状態で該リング拡径用
芯金Ａの両端を芯金台Ｃに固定する。この際リング拡径
用芯金Ａの複数の曲面のうち、一番曲率半径の小さい曲
面Ｒ1 をプレスＤ側に向けて固定する。Next, as described above, different songs are arranged in the circumferential direction.
A core metal for ring expansion that has multiple curved surfaces with index radii
Explain the case of expanding the ring-shaped expanded object
I do. As shown in FIG. 3, the core metal A for expanding the ring has a circumferential direction.
Different radius of curvature R1<R Two<RThree<RFour4 with
Curved surface is formed. Outer circumference of core metal A for expanding the diameter of this ring
For expanding the ring diameter with the ring-shaped expanded object B placed
Both ends of the core metal A are fixed to the core metal base C. At this time, ring expansion
Of the multiple curved surfaces of core metal A, the curve with the smallest radius of curvature
Surface R1Is fixed toward the press D side.
【００１４】次にリング状被拡径体ＢをプレスＤとリン
グ拡径用芯金Ａの一番曲率半径の小さい曲面Ｒ1 との間
で圧縮する。この圧縮作業は、リング状被拡径体Ｂをリ
ング拡径用芯金Ａの周りに回転させながら行う。これに
よってリング状被拡径体Ｂはある大きさに拡径される。Next, the ring-shaped expanded body B is compressed between the press D and the curved surface R 1 having the smallest radius of curvature of the ring expanding core metal A. This compression work is performed while rotating the ring-shaped diameter-expanded body B around the ring diameter-increasing core metal A. As a result, the ring-shaped expandable body B is expanded to a certain size.
【００１５】次にリング拡径用芯金Ａを回転させて２番
目に曲率半径の小さい曲面Ｒ2 をプレスＤ側に向けて固
定する。この状態で再度リング状被拡径体ＢをプレスＤ
とリング拡径用芯金Ａの曲面Ｒ2 との間で圧縮する。こ
の圧縮作業は、リング状被拡径体Ｂをリング拡径用芯金
Ａの周りに回転させながら行う。これによってリング状
被拡径体Ｂは更に拡径される。Next, the ring expanding core A is rotated to fix the curved surface R 2 having the second smallest radius of curvature toward the press D side. In this state, press the ring-shaped expanded body B again
And the curved surface R 2 of the core metal A for expanding the ring diameter. This compression work is performed while rotating the ring-shaped diameter-expanded body B around the ring diameter-increasing core metal A. As a result, the ring-shaped expandable body B is further expanded.
【００１６】以下同様に曲面Ｒ3 および曲面Ｒ4 をプレ
スＤ側に順次向けてこれらの各曲面Ｒ3 ・Ｒ4 とプレス
Ｄとでリング状被拡径体Ｂを順次圧縮する。これによっ
てリング状被拡径体を所定の大きさに拡径し、所望の大
きさのリングを形成するものである。Similarly, the curved surface R 3 and the curved surface R 4 are sequentially directed toward the press D, and the ring-shaped diameter-expanded body B is sequentially compressed by the respective curved surfaces R 3 and R 4 and the press D. As a result, the ring-shaped body to be expanded is expanded to a predetermined size to form a ring of a desired size.
【００１７】[0017]
【実施例】円周方向に、４５０ｍｍ、６５０ｍｍ、８５
０ｍｍ、１０５０ｍｍの曲率半径を持つ４個の曲面を形
成して本発明に係るリング拡径用芯金を形成した。この
芯金を使用して、内径９８０ｍｍのアルミ合金製のリン
グ状被拡径体を最終製品が内径２２００ｍｍであるリン
グに仕上げた。この際、まず４５０ｍｍの曲面をプレス
側に向けて固定しかかる曲面を利用して内径１３９０ｍ
ｍまで拡径した。次に６５０ｍｍの曲面をプレス側に向
けて固定しかかる曲面を利用して内径１７５０ｍｍまで
拡径した。、次に８５０ｍｍの曲面をプレス側に向けて
固定しかかる曲面を利用して内径２０００ｍｍまで拡径
した。最後に１０５０ｍｍの曲面をプレス側に向けて固
定しかかる曲面を利用して内径２２００ｍｍまで拡径し
た。上記拡径作業の途中で、リング状被拡径体を再加熱
することはなかった。Example: 450 mm, 650 mm, 85 in the circumferential direction
Four curved surfaces having a radius of curvature of 0 mm and 1050 mm were formed to form a ring expanding core metal according to the present invention. Using this core metal, a ring-shaped expandable body made of an aluminum alloy having an inner diameter of 980 mm was finished into a ring having an inner diameter of 2200 mm as a final product. At this time, first, a 450 mm curved surface is fixed toward the press side, and the curved surface is used to measure an inner diameter of 1390 m.
Expanded to m. Next, a curved surface of 650 mm was fixed toward the press side, and using this curved surface, the inner diameter was expanded to 1750 mm. Then, a curved surface of 850 mm was fixed toward the press side, and the inner diameter was expanded to 2000 mm using the curved surface. Finally, a curved surface of 1050 mm was fixed toward the press side, and using this curved surface, the inner diameter was expanded to 2200 mm. The ring-shaped diameter-expanded body was not reheated during the diameter-expansion work.
【００１８】これに対して従来の方法では、４５０ｍ
ｍ、６５０ｍｍ、８５０ｍｍ、１０５０ｍｍの曲率半径
を持つ４個のリング拡径用芯金を別個に製造しておき、
これをアルミ合金製のリング状被拡径体の内径に応じて
順次交換して内径９８０ｍｍのアルミニウム製のリング
状被拡径体を内径２２００ｍｍのリングに仕上げなけれ
ばならなかった。また従来の方法においては、芯金を交
換する度にリング状被拡径体を再加熱する必要があっ
た。On the other hand, in the conventional method, 450 m
m, 650 mm, 850 mm, 1050 mm radius of curvature of four ring cores for diameter expansion are manufactured separately,
This had to be sequentially replaced according to the inner diameter of the aluminum alloy ring-shaped diameter-expanded body to finish the aluminum ring-shaped diameter-expanded body having an inner diameter of 980 mm into a ring having an inner diameter of 2200 mm. Further, in the conventional method, it is necessary to reheat the ring-shaped diameter-expanded body every time the core metal is replaced.
【００１９】なお、本発明においては、円周方向に異な
った曲率半径を持つ複数の曲面を形成したリング拡径用
芯金を１本のみではなく複数本使用し、かかる芯金を交
換することによってリング状被拡径体を拡径するように
してもよいことは勿論である。In the present invention, not only one ring expanding core having a plurality of curved surfaces having different radii of curvature in the circumferential direction but also a plurality of core expanding cores is used and the cores are replaced. Needless to say, the ring-shaped body to be expanded may be expanded in diameter.
【００２０】[0020]
【発明の効果】以上のように、本発明に係るリング拡径
用芯金は、円周方向に異なった曲率半径を持つ複数の曲
面が形成されているために、１本の芯金で径の異なる複
数本の芯金と同様な作業を行うことができる。したがっ
て芯金の数を減少させることができるので、芯金の製作
費が安価になると共にそれらを置くためのスペースも少
なくて済むという効果がある。As described above, since the ring expanding core metal according to the present invention is formed with a plurality of curved surfaces having different radii of curvature in the circumferential direction, the diameter of one core metal is large. It is possible to perform a work similar to that of a plurality of cored bars different from each other. Therefore, since the number of cores can be reduced, the manufacturing cost of the cores is low, and the space for placing them is small.
【００２１】また、本発明に係るリング拡径方法によれ
ば、芯金の交換作業を無しまたは大幅に減らすことがで
きると共に芯金の曲面を変更させる作業を短時間でおこ
なうことができる。したがって拡径に要する作業時間を
短縮することができるばかりでなく芯金の曲面を変更さ
せる作業を短時間でおこなうことができるのでリング状
被拡径体を再加熱する必要がなくなるという顕著な効果
がある。According to the ring diameter expanding method of the present invention, the work of exchanging the cored bar can be eliminated or greatly reduced, and the operation of changing the curved surface of the cored bar can be performed in a short time. Therefore, not only the work time required for the diameter expansion can be shortened, but also the work for changing the curved surface of the core metal can be performed in a short time, so that it is not necessary to reheat the ring-shaped diameter-expanded body. There is.
【図１】本発明のリング拡径用芯金の一実施の形態を示
すもので、（イ）は断面図、（ロ）は側面図。FIG. 1 shows an embodiment of a core metal for expanding a ring diameter of the present invention, in which (a) is a sectional view and (b) is a side view.
【図２】本発明のリング拡径用芯金の他の実施の形態を
示す断面図。FIG. 2 is a cross-sectional view showing another embodiment of the core metal for expanding the ring diameter of the present invention.
【図３】本発明のリング拡径方法の実施状況を示す説明
図。FIG. 3 is an explanatory view showing an implementation situation of the ring diameter expanding method of the present invention.
Ａ リング拡径用芯金 Ｂ リング状被拡径体 Ｃ 芯金台 Ｄ プレス １、２、３、４ 曲面 Ｒ1 、Ｒ2 、Ｒ3 、Ｒ4 曲率半径の大きさA Ring expansion core B Ring expanded object C Core bar D Press 1 , 2 , 3 , 4 Curved surface R 1 , R 2 , R 3 , R 4 Curvature radius size
Claims (2)
数の曲面を形成したことを特徴とするリング拡径用芯
金。1. A core metal for expanding a ring, wherein a plurality of curved surfaces having different radii of curvature are formed in a circumferential direction.
径体を配置し、該リング状被拡径体をプレスとリング拡
径用芯金とで圧縮しながら拡径用芯金の回りに回転さ
せ、これによってリング状被拡径体を拡径してなるリン
グ拡径方法において、リング拡径用芯金として円周方向
に異なった曲率半径を持つ複数の曲面を形成したリング
拡径用芯金を使用し、リング状被拡径体をプレスとリン
グ拡径用芯金とで圧縮して拡径する際、曲率半径の小さ
な曲面から曲率半径の大きな曲面の順番で各曲面を順次
プレス側に対向させることを特徴とするリング拡径方
法。2. A ring-shaped diameter-expanded body is arranged on the outer periphery of the ring diameter-increased core, and the ring-shaped diameter-increased body is compressed by a press and a ring diameter-expansion core metal. In the ring expanding method in which the ring-shaped expanded object is expanded by rotating the ring, the ring having a plurality of curved surfaces having different curvature radii in the circumferential direction is used as the ring expanding core metal. When a ring-shaped diameter-expanded body is compressed and expanded by a press and a ring diameter-expanding core metal using a diameter-expansion core metal, each curved surface in order from a curved surface with a small radius of curvature to a curved surface with a large radius of curvature. The ring diameter expanding method characterized in that the rings are sequentially opposed to the press side.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11632396A JP3565462B2 (en) | 1996-05-10 | 1996-05-10 | Ring expanding core and ring expanding method using the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11632396A JP3565462B2 (en) | 1996-05-10 | 1996-05-10 | Ring expanding core and ring expanding method using the same |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH09295080A true JPH09295080A (en) | 1997-11-18 |
| JP3565462B2 JP3565462B2 (en) | 2004-09-15 |
Family
ID=14684143
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11632396A Expired - Lifetime JP3565462B2 (en) | 1996-05-10 | 1996-05-10 | Ring expanding core and ring expanding method using the same |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3565462B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114260398A (en) * | 2020-09-16 | 2022-04-01 | 宝山钢铁股份有限公司 | Forming device for preparing closed metal square frame and preparation method thereof |
| CN114309443A (en) * | 2021-12-29 | 2022-04-12 | 西南铝业（集团）有限责任公司 | Preparation method of 6061T6 forged ring |
-
1996
- 1996-05-10 JP JP11632396A patent/JP3565462B2/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114260398A (en) * | 2020-09-16 | 2022-04-01 | 宝山钢铁股份有限公司 | Forming device for preparing closed metal square frame and preparation method thereof |
| CN114260398B (en) * | 2020-09-16 | 2024-03-08 | 宝山钢铁股份有限公司 | Forming device for preparing closed metal square frame and preparation method thereof |
| CN114309443A (en) * | 2021-12-29 | 2022-04-12 | 西南铝业（集团）有限责任公司 | Preparation method of 6061T6 forged ring |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3565462B2 (en) | 2004-09-15 |
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