JPH0260416B2 - - Google Patents
Info
- Publication number
- JPH0260416B2 JPH0260416B2 JP56211145A JP21114581A JPH0260416B2 JP H0260416 B2 JPH0260416 B2 JP H0260416B2 JP 56211145 A JP56211145 A JP 56211145A JP 21114581 A JP21114581 A JP 21114581A JP H0260416 B2 JPH0260416 B2 JP H0260416B2
- Authority
- JP
- Japan
- Prior art keywords
- part side
- shape
- sash
- axis
- door sash
- 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
- 239000000463 material Substances 0.000 claims description 27
- 238000004519 manufacturing process Methods 0.000 claims description 15
- 238000000034 method Methods 0.000 claims description 11
- 238000005452 bending Methods 0.000 claims description 9
- 238000005520 cutting process Methods 0.000 claims description 9
- 230000001788 irregular Effects 0.000 claims description 5
- 238000003825 pressing Methods 0.000 claims description 5
- 239000005357 flat glass Substances 0.000 claims description 4
- 239000002184 metal Substances 0.000 claims description 4
- 239000011521 glass Substances 0.000 claims description 3
- 230000002093 peripheral effect Effects 0.000 claims 1
- 238000003466 welding Methods 0.000 description 18
- 238000005304 joining Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
Landscapes
- Wing Frames And Configurations (AREA)
Description
【発明の詳細な説明】
産業上の利用分野
本発明は、所定の異形な横断面形状に予め成形
した金属製の長尺な直線状のサツシ素材から、ア
ツパー部側とサイド部側とで側面略へ、コの字状
等の所定な軸線形状を呈する車輌用ドアサツシを
形成するのに適用される車輌用ドアサツシの製造
方法に関するものである。DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention is characterized in that a long linear sash material made of metal is preformed into a predetermined irregular cross-sectional shape, and a side surface is formed between the upper part side and the side part side. The present invention generally relates to a method for manufacturing a vehicle door sash that is applied to forming a vehicle door sash having a predetermined axial shape such as a U-shape.
従来の技術
一般に、車輌用ドアサツシには、第１図ａで示
すような外側部１、内側部２、ガラス受入れ溝部
３、ウエザーストリツプ保持部４から異形な横断
面形状を呈する直線状の長尺材に、所定巾の金属
ストリツプ材を冷間ロール成形で予め屈曲成形し
たサツシ素材を用いて製造するものがある。2. Description of the Related Art In general, a door sash for a vehicle has a straight line which has an irregular cross-sectional shape from an outer part 1, an inner part 2, a glass receiving groove part 3, and a weather strip holding part 4, as shown in FIG. 1a. BACKGROUND OF THE INVENTION Some long materials are manufactured using a sash material that is formed by cold roll forming a metal strip material of a predetermined width.
従来、この車輌用ドアサツシを製造するのにあ
たつては、通常、上述した如く予め所定の横断面
形状に屈曲成形したサツシ素材を車輌の右側用、
左側用のアツパー側として必要な二倍の長さに切
断すると共に、そのサツシ素材を左右対称となる
よう軸線曲げを行つて一本の連続したサツシ素材
を車輌の右側用、左側用として曲げ加工し、この
サツシ素材を中央部分で切断することにより第１
図ｂで示す如き軸線形状を有し且つ第１図ｃで示
すような側面弓形に弯曲成形したアツパー部側を
得、また、別途同様にサイド部側を製作し、その
アツパー部側、サイド部側の互いに接合される各
端部を所定な接合角θの1/2θ角度で斜めに切断
した後、各断端面を互いに突き合せて突合せ部を
フラツシバツト、テイグ、ミグ、アーク等で溶接
することにより一つのドアサツシとして形成する
ことが行なわれている。 Conventionally, when manufacturing door sashes for vehicles, the sash material is usually bent and formed into a predetermined cross-sectional shape as described above.
The sash material is cut to twice the length required for the upper side of the left side, and the sash material is bent along the axis so that it is symmetrical, and one continuous sash material is bent for the right side and left side of the vehicle. By cutting this satsushi material at the center, the first
An upper part side having an axial shape as shown in Fig. 1b and a side curved shape as shown in Fig. 1c is obtained, and a side part side is separately manufactured in the same manner, After cutting the ends to be joined to each other diagonally at an angle of 1/2θ of the predetermined joint angle θ, the cut ends are abutted against each other and the butted parts are welded using flashbutt, Teig, MIG, arc, etc. In this way, the door sash is formed as a single door sash.
この製造方法が常套的に取られているのは車輌
用のドアサツシが左右対で装備されるものである
から、夫々を必ず同じ条件下で軸線曲げするのが
よいという固定観念が背景にある。また、自動
車、車輌産業界においては時代の流れ、ニーズの
変化との関連から大量生産及び生産性の向上が至
上目標としてあり、これを達成するためには左右
用を同時に軸線曲げした一本のサツシ素材から中
間部分で切断して得られる各アツパー部側、サイ
ド部側を互いに突き合せて溶接するのが当業界の
技術的な常識に基づけば最善な方法と考えられて
いることも根底にある。 This manufacturing method is commonly used because vehicle door sashes are installed as a pair of left and right door sashes, so there is a fixed idea behind the idea that it is best to bend the axis of each door sash under the same conditions. In addition, in the automobile and vehicle industry, mass production and productivity improvement are the ultimate goals in relation to the trends of the times and changes in needs. Based on the technical common sense in the industry, it is believed that the best method is to cut the sash material at the middle and then weld the upper and side parts against each other. be.
発明が解決しようとする課題
然し、上述した方法に依ると、アツパー部側
ａ、サイド部側ｂが共に予め軸線曲げされ、特に
アツパー部側にあつては全長に亘つて厳密にはス
トレートな部分が全く存在しないよう軸線方向に
沿つて夫々異なる曲率で予め曲げられることにな
る。これに加えて、軸線を捩るようにも予め曲げ
られるから、両者を切断部分及び溶接部分以外で
所定長さに亘つて挾持した状態で互いに接合され
る各端部を所定の接各θの1/2θの角度で切断し、
しかる後に断端面を互いに突き合せて溶接しても
各断端面を全面に亘つて完全に密着させることが
困難で、その突合せ部に多少のバラ付きや隙間が
発生することを免れ得ない。この状態で溶接する
と、突合せ部が均一に加熱溶接されずしかも溶接
部分が冷却固化するのに伴つて相互間の収縮量に
バラ付きが発生することにより接部から他端側に
向つて大きな偏位によるバラ付きで溶接の暴れが
現出することになる。その暴れは事後に矯正する
必要があるが、この矯正は極めて手間の掛る手作
業で行わなければならない。特に、上述した自動
車用ドアサツシにおいてはガラス受入れ溝部を有
するものであるから、この溝内に窓ガラスをスム
ーズに摺動させるためにはドアサツシが所定の寸
法、形状に正確に保たれていなければならず、溶
接による暴れが残つていると捩れ等で窓ガラスの
摺動抵抗が極めて大きくなつたり或いは機能を発
揮しなくなるという事態を招く。また、その矯正
を単なる曲げ処理で行うと、適度の好ましくない
局部的な応力や歪みを接合部に発生させて溶接部
に割れや強度不足を誘発する一因ともなりかねな
い。更に、本願出願前にはドアサツシの横断面形
状が比較的単純なものであつたから手作業による
矯正でもある程度対応できたが、本願の出願時点
ではドアサツシの剛性を向上する必要から横断面
形状が複雑な形状に変る傾向にあつて、手作業に
よるだけでは正確に矯正するよう対応できなくな
つている状況もある。Problems to be Solved by the Invention However, according to the method described above, both the upper part side a and the side part side b are axially bent in advance, and in particular, the upper part side is strictly a straight part over the entire length. They are pre-bent at different curvatures along the axial direction so that there are no curves. In addition, since the axes can be bent in advance so as to twist, the ends to be joined to each other are held at a predetermined angle of 1 of each θ while the two are held together over a predetermined length other than at the cut and welded parts. Cut at an angle of /2θ,
Even if the stump surfaces are then butted against each other and welded, it is difficult to bring the respective stump surfaces into complete contact over the entire surface, and it is inevitable that some unevenness or gaps will occur at the butt portions. . If welding is performed in this state, the butt part will not be uniformly heated and welded, and as the welded part cools and solidifies, the amount of shrinkage will vary, resulting in a large deviation from the welding part toward the other end. Due to variations in position, unruly welding will appear. This behavior must be corrected after the fact, but this correction must be done manually, which is extremely time-consuming. In particular, the above-mentioned automobile door sash has a glass receiving groove, so in order for the window glass to slide smoothly into this groove, the door sash must be accurately maintained at a predetermined size and shape. First, if any unruliness from welding remains, the sliding resistance of the window glass will become extremely large due to twisting, etc., or the window glass will no longer function properly. Furthermore, if the correction is performed by a simple bending process, a moderate amount of undesirable local stress or distortion may be generated in the joint, which may cause cracks or insufficient strength in the weld. Furthermore, before the filing of this application, the cross-sectional shape of the door sash was relatively simple, so manual correction could be applied to some extent, but at the time of filing this application, the cross-sectional shape was complicated due to the need to improve the rigidity of the door sash. In some cases, it is no longer possible to correct the shape accurately by hand alone.
茲において、本発明は軸線の矯正曲げや捩り曲
げが事後に必要とされないよう正確に溶接できし
かも所望通りの軸線形状を有する車輌用ドアサツ
シを製造できるよう創意工夫した車輌用ドアサツ
シの製造方法を提供することを目的とする。 In this regard, the present invention provides a method for manufacturing a door sash for a vehicle, which is ingeniously devised so that a door sash for a vehicle can be accurately welded and have a desired axial shape so that corrective bending or twisting of the axis is not required after the fact. The purpose is to
課題を解決するための手段
本発明に係る車輌用ドアサツシの製造方法にお
いては、少なくとも軸線方向に沿つて側面弓形等
の所望な軸線形状に弯曲成形する必要のあるアツ
パー部側の軸線を長尺な直線状のサツシ素材のま
まに保持し、そのアツパー部側とサイド部側を含
む両サツシ素材の互いに接合される各端部を軸線
の所定な接合角θの1/2θの角度で斜めに切断し
た後、これら異形な断端面を有する各サツシ素材
の各端部を相互に形状合させて突き合せると共
に、その突合せ部を溶接したアツパー部側が直線
状のままのドアサツシ中間材を得、この後にアツ
パー部側の軸線を所望形状に弯曲形成させて車輌
用ドアサツシとして製造するようにされている。Means for Solving the Problems In the method for manufacturing a vehicle door sash according to the present invention, the axis of the upper part side that needs to be curved into a desired axial shape such as a side bow shape at least along the axial direction is elongated. Hold the straight sash material as it is, and cut the ends of both sash materials, including the top and side parts, to be joined to each other diagonally at an angle of 1/2θ of the predetermined joint angle θ of the axis. After that, the ends of each sash material having these irregularly shaped cut surfaces are matched and abutted against each other, and the abutted parts are welded to obtain a door sash intermediate material in which the upper part side remains straight. Later, the axis of the upper part side is curved into a desired shape to manufacture a vehicle door sash.
作 用
この車輌用ドアサツシの製造方法では当業界の
常識にとらわれないで、軸線方向を所望の軸線形
状に弯曲成形する必要のあるアツパー部側を直線
状のままに保持した状態で各サツシ素材の各端部
を突合せに必要な接合角θの1/2θの角度で斜め
に切断し、その異形な断端面を形状合せさせて突
き合せた後突合せ部を溶接するものであるから、
突合せ部を局部的に加熱させて溶接することによ
つてもねじれ等が発生することはなく、被取付体
となるパネル部材の形状に合わせて正確に形成す
ることができる。Function This method of manufacturing door sashes for vehicles is not bound by common sense in the industry, and involves manufacturing each sash material while keeping the upper part side, which needs to be curved in the axial direction to the desired axial shape, in a straight line. Each end is cut diagonally at an angle of 1/2θ of the joint angle θ required for butting, and after the irregularly shaped cut surfaces are matched and butted, the butted parts are welded.
Even if the butt portions are locally heated and welded, twisting or the like does not occur, and the panel member can be formed accurately to match the shape of the panel member to be attached.
実施例
以下、第２及び３図を参照して説明すれば、次
の通りである。Embodiments The following description will be made with reference to FIGS. 2 and 3.
図示実施例においては、全体が側面略への字状
を呈するようにアツパー部側ａとサイド部側ｂと
を溶着接合することにより自動車用ドアサツシを
製造することが行われている。このアツパー部側
ａ、サイド部側ｂとしてはいずれも第１図ａで示
すと同じ横断面形状に屈曲成形したサツシ素材を
夫々所定長さに切断して用い、そのうちサイド部
側ｂのサツシ素材は第１図ｂのような正面円弧形
を呈する軸線形状に予め弯曲成形したものを用い
てもよい。これに対し、少なくとも、アツパー部
側ａは所定の横断面形状に形成したサツシ素材を
軸線方向に沿つて直線状のままに保持する。その
状態で、アツパー部側ａ、サイド部側ｂの互いに
接合される端部を所定の接合角θの1/2θに相応
する角度で斜めに切断する。この切断は切造端の
近傍をホルダー等で挾持すると共に、別途のメタ
ルソー等で切断するようにできる。その切断にあ
たつては軸線方向を所定形状に弯曲成形する必要
のある少なくともアツパー部側ａのサツシ素材を
直線状のまま保持することにより行うので、サツ
シ素材を挾持するホルダー等に対して位置関係が
バラ付かないことにより、所定の角度に正確に切
断することができる。この切断後に、アツパー部
側ａとサイド部側ｂの各異形な断端面相互を形状
合せさせて突合せ、更に互いに溶接することによ
りドアサツシの中間材を得る。その溶接にあたつ
てはフラツシユバツト、テイグ、ミグ、アーク等
の溶接方法を適用することができ、このうちでは
特にテイグ、ミグ溶接法を適用するのが好まし
い。その溶接時にはアツパー部側ａが直線状のま
まに保持されているから、上述した切断時と同様
に正確な突合せ位置決めを行うことができ、突合
せ部のみを溶接で局部的に加熱しても異形な断端
面相互が正確に形状合せされているのでねじれ等
が生ずることもない。 In the illustrated embodiment, a door sash for an automobile is manufactured by welding and joining an upper part side a and a side part side b so that the whole exhibits a substantially curved side shape. For both the upper part side a and the side part side b, sash material bent and formed into the same cross-sectional shape as shown in FIG. It is also possible to use one whose axial line is curved in advance to have an arcuate frontal shape as shown in FIG. 1b. On the other hand, at least the upper part side a holds the sash material formed in a predetermined cross-sectional shape in a straight line along the axial direction. In this state, the ends of the upper part side a and the side part side b which are to be joined to each other are cut diagonally at an angle corresponding to 1/2θ of the predetermined joining angle θ. This cutting can be done by holding the vicinity of the cut end with a holder or the like and cutting with a separate metal saw or the like. The cutting is carried out by holding the sash material on at least the upper part side a straight, which needs to be curved into a predetermined shape in the axial direction, so that the sash material is positioned relative to the holder etc. that holds the sash material. Since the relationship does not vary, cutting can be performed accurately at a predetermined angle. After this cutting, the irregularly shaped cut end surfaces of the upper part side a and the side part side b are matched and butted together, and further welded together to obtain an intermediate member of the door sash. For welding, flash butt, Teig, MIG, arc welding methods and the like can be used, and Teig and Mig welding methods are particularly preferred. During welding, the upper part side a is held straight, so accurate butt positioning can be performed in the same way as when cutting as described above, and even if only the butt part is locally heated during welding, it will not be possible to form irregular shapes. Since the cross-section surfaces are precisely aligned with each other, twisting and the like will not occur.
このように、アツパー部側ａとサイド部側ｂと
を溶接した後は、第２図で示す如くアツパー部側
ａが少なくとも直線状のままに保持されているか
らドアサツシの中間材として側面が金尺状の形状
を呈するようになる。そのドアサツシの中間材を
得たならば、アツパー部側ａには軸線を略弓形等
の所望な軸線形状に弯曲成形する曲げ加工を施
す。この曲げ加工を行うときには第３図に示す如
くアツパー部側ａ、サイド部側ｂの各内側から所
望の軸線形状に弯曲成形する曲面を持つ受け型
（図示せず）を用い、アツパー部側ａには押し型
w1で押圧力を加えて受け型の曲面に軸線を圧接
することにより曲げ加工を施すことができる。そ
の押し型w1は受け型の曲げ半径の中心外側より
アツパー部側ａの軸線に沿つて摺動すれば、アツ
パー部側ａの軸線に押圧力を加えることができる
から曲げ加工を行うことができる。また、サイド
部側ｂにあつては押し型w1と同調して摺動する
押し型w2で押圧保持すればよく、その押し型w2
でサイド部側ｂも側面円弧状を呈するよう曲げ加
工をすることができる。 In this way, after welding the upper part side a and the side part side b, the upper part side a is held at least straight as shown in FIG. It begins to take on an elongated shape. Once the intermediate material for the door sash is obtained, the upper part side a is bent to curve the axis into a desired axis shape, such as a substantially arcuate shape. When performing this bending process, as shown in FIG. There is a push type
Bending can be performed by pressing the axis line against the curved surface of the receiving mold by applying a pressing force with w 1 . If the pressing mold w 1 slides along the axis of the upper part side a from outside the center of the bending radius of the receiving mold, it can apply a pressing force to the axis of the upper part side a, so that bending can be performed. can. In addition, for the side part side b, it is only necessary to press and hold it with a press die w 2 that slides in synchronization with the press die w 1 , and the press die w 2
The side part side b can also be bent so as to have a side arc shape.
このように、少なくともアツパー部側ａを直線
状のままに保持して各断端面を突合せて相互を溶
接すれば、互いに接合される各端部を正確な角度
に保て切断できしかも突合せも各断端面相互を形
状合せすることにより行えるから、溶接の際にも
隙間等を発生させないで変動の少ない略均一な溶
接ができることになる。また、そのアツパー部側
ａ、サイド部側ｂの各端部溶接後、アツパー部側
ａの如き弓状等の側面形状に成形する必要のある
部分に曲げ加工を施すから、この曲げ加工側を所
期の曲げ形状通りに形成することができる。 In this way, by keeping at least the upper part side a straight and abutting each cut end surface and welding each other, each end to be joined to each other can be cut while maintaining an accurate angle, and the butt can also be easily cut. Since this can be done by matching the shapes of the respective cross-section surfaces, substantially uniform welding with little variation can be achieved without creating any gaps during welding. In addition, after welding the ends of the upper part side a and side part side b, bending is performed on the part of the upper part side a that needs to be formed into a side shape such as an arcuate shape. It can be formed into a desired bent shape.
なお、上述した実施例は略への字状を呈するフ
ロント側のサイドドアサツシに基づいて説明した
が、それは略コの字状に形成するバツク側のサイ
ドドアサツシにも同様に適用することができる。
また、溶接面は正確に密着した突合せ部として溶
接できるので、過度な肉盛り部や溶け込み部が発
生しないから事後にグラインダ等で研磨する程度
で表面を短時間に美麗な平滑面に容易に仕上げる
ことができる。 Although the above-mentioned embodiment has been explained based on the front side door sash having a substantially U-shape, it can be similarly applied to the back side door sash having a substantially U-shape. can.
In addition, since the welding surfaces can be welded as exactly tight butt parts, excessive build-up or welding will not occur, so the surface can be easily finished into a beautiful smooth surface in a short time by simply polishing with a grinder etc. be able to.
発明の効果
以上の如く、本発明に係るドアサツシの製造方
法に依れば、アツパー部側、サイド部側の各端部
溶接に溶接の抜け落ち等による接合不良を生ずる
ことなく、その突合せ部を局部的に加熱しても各
サツシ素材の異形な断端面相互を正確に形状合せ
できるから暴れが生ずることも抑え得、各部分の
曲げ形状にバラ付きが発生しないので正確な接
合、形状保持を図ることができる。Effects of the Invention As described above, according to the method for manufacturing a door sash according to the present invention, the butt portions can be locally welded without causing joint failure due to weld dropout in the welding of each end of the upper part side and the side part side. Even when heated, the irregularly shaped end surfaces of each sash material can be precisely matched to each other, which prevents the occurrence of unruliness, and the bending shape of each part does not vary, allowing for accurate joining and shape retention. can be achieved.
第１図ａ，ｂ，ｃは従来例に係る車輌用ドアサ
ツシの製造工程を示す説明図、第２及び３図は本
発明に係る車輌用ドアサツシの製造工程を示す説
明図である。
ａ：アツパー部、ｂ：サイド部、w1，w2：押
し型。
FIGS. 1a, b, and c are explanatory views showing the manufacturing process of a conventional vehicle door sash, and FIGS. 2 and 3 are explanatory views showing the manufacturing process of a vehicle door sash according to the present invention. a: top part, b: side part, w 1 , w 2 : press mold.
Claims (1)
受入れ溝を有する異形な横断面形状に予め屈曲成
形した金属製の長尺な直線状のサツシ素材から、
アツパー部側とサイド部側とで側面略へ、コの字
状等の所定な軸線形状を呈する車輌用ドアサツシ
を形成するべく、少なくとも軸線方向に沿つて側
面弓形等の所望な軸線形状に弯曲成形する必要の
あるアツパー部側の軸線を長尺な直線状のサツシ
素材のままに保持し、そのアツパー部とサイド部
側を含む両サツシ素材の互いに接合される各端部
を軸線の所定な接合角θの1/2θの角度で斜めに
切断した後、これら異形な断端面を有する各サツ
シ素材の端部を相互に形状合せさせて突き合せる
と共に、その突合せ部を溶接してアツパー部側が
直線状のままのドアサツシ中間材を得、この後に
アツパー部側の軸線を所望な軸線形状に弯曲成形
させて車輌用ドアサツシとして製造するようにし
たことを特徴とする車輌用ドアサツシの製造方
法。 ２ 上記アツパー部側の所望な軸線形状に相応す
る曲面を持つ受け型に、曲げ半径の中心外側から
押圧摺動する押し型でアツパー部側の軸線を圧接
することによりアツパー部側の軸線を弯曲成形す
るようにしたところの特許請求の範囲第１項記載
の車輌用ドアサツシの製造方法。[Scope of Claims] 1. A long linear sash material made of metal that has been bent and formed in advance into an irregular cross-sectional shape having a continuous glass receiving groove that guides the peripheral edge of the window glass,
In order to form a vehicle door sash that exhibits a predetermined axial shape such as a U-shape, the upper part side and the side part side are curved into a desired axial shape such as a side bow shape at least along the axial direction. Keep the axis of the top part side that needs to be fixed as a long straight sash material, and join each end of both the sash materials including the top part and side part side to each other at the specified joint of the axis line. After cutting diagonally at an angle of 1/2θ of the angle θ, the ends of each sash material with these irregular cut surfaces are matched and butted against each other, and the butted portions are welded to make the upper part side This method of manufacturing a door sash for a vehicle is characterized in that the door sash intermediate material is obtained in a straight line, and then the axis on the upper part side is curved into a desired axial shape to manufacture the door sash for the vehicle. 2 The axis of the upper part side is curved by pressing the axis of the upper part side with a receiving mold having a curved surface corresponding to the desired axis shape of the upper part side with a press die that presses and slides from outside the center of the bending radius. A method for manufacturing a vehicle door sash according to claim 1, wherein the door sill is molded.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21114581A JPS58110780A (en) | 1981-12-25 | 1981-12-25 | Production of door sash for vehicle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21114581A JPS58110780A (en) | 1981-12-25 | 1981-12-25 | Production of door sash for vehicle |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS58110780A JPS58110780A (en) | 1983-07-01 |
| JPH0260416B2 true JPH0260416B2 (en) | 1990-12-17 |
Family
ID=16601121
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP21114581A Granted JPS58110780A (en) | 1981-12-25 | 1981-12-25 | Production of door sash for vehicle |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58110780A (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5699094A (en) * | 1980-01-14 | 1981-08-10 | Nippon Steel Metal Prod Co Ltd | Manufacture of square welded steel pipe |
-
1981
- 1981-12-25 JP JP21114581A patent/JPS58110780A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5699094A (en) * | 1980-01-14 | 1981-08-10 | Nippon Steel Metal Prod Co Ltd | Manufacture of square welded steel pipe |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS58110780A (en) | 1983-07-01 |
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