JP2002102916A - Method for manufacturing inside grooved tube - Google Patents
Method for manufacturing inside grooved tubeInfo
- Publication number
- JP2002102916A JP2002102916A JP2000302282A JP2000302282A JP2002102916A JP 2002102916 A JP2002102916 A JP 2002102916A JP 2000302282 A JP2000302282 A JP 2000302282A JP 2000302282 A JP2000302282 A JP 2000302282A JP 2002102916 A JP2002102916 A JP 2002102916A
- Authority
- JP
- Japan
- Prior art keywords
- grooved
- plug
- metal tube
- tube
- manufacturing
- 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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Links
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- Metal Extraction Processes (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、内面溝付管の製造
方法に関し、特に、転造法により内面に溝が加工された
金属管を製造する際の溝付プラグの欠けを低減するため
の内面溝付管の製造方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a grooved tube having an inner surface, and more particularly to a method for reducing chipping of a grooved plug when manufacturing a metal tube having a groove formed on an inner surface by a rolling method. The present invention relates to a method for manufacturing an inner grooved pipe.
【０００２】[0002]
【従来の技術】空気調和機や冷凍機などの熱交換器に
は、金属管による伝熱管が用いられている。この伝熱管
は、管内に相変化する冷媒を流動させ、管外流体との熱
交換を行うことにより、冷媒の蒸発あるいは凝縮を生じ
させるものである。例えば、ルームエアコンなどの熱交
換器においては、管内での冷媒の蒸発や凝縮による熱伝
導を促進するために、内面に螺旋状の連続した溝を設け
た内面溝付伝熱管（内面溝付管）が用いられている。こ
の内面溝付管には、シームレスタイプとシームタイプが
ある。シームレスタイプの製造方法として、例えば、特
開昭５４−３７０５９号公報、特開平６−１５３４５号
公報、特開平４−２６６４１７号公報（特許第２７５６
１９２号）などに提示されている。これら公報に共通す
る製造方法を以下に説明する。2. Description of the Related Art Heat exchangers such as metal tubes are used for heat exchangers such as air conditioners and refrigerators. The heat transfer tube causes the refrigerant that changes phase to flow in the tube and exchanges heat with the fluid outside the tube, thereby causing the refrigerant to evaporate or condense. For example, in a heat exchanger such as a room air conditioner, an inner grooved heat transfer tube (an inner grooved tube) having a spiral continuous groove on an inner surface thereof in order to promote heat conduction by evaporation and condensation of a refrigerant in the tube. ) Is used. The inner grooved pipe includes a seamless type and a seam type. As a seamless type manufacturing method, for example, JP-A-54-37059, JP-A-6-15345, and JP-A-4-266417 (Japanese Patent No. 2756)
192). Manufacturing methods common to these publications will be described below.
【０００３】図３は内面溝付管の製造方法を示す。金属
管１は保持ダイス９押圧手段５、６及び引抜きダイス
７、８に通される。この金属管１に、フローティングプ
ラグ２、このフローティングプラグ２に結合された連結
棒３、及び連結棒３の後端に結合された溝付プラグ４を
挿入して移動させることによりフローティングプラグ２
が保持ダイス９の部分に保持され、溝付プラグ４が押圧
手段５、６に対向する位置にセットされる。この溝付プ
ラグ４の周囲には、遊星回転する複数のロールやボール
等により構成された押圧手段５，６が配設され、この押
圧手段５，６によって対向位置を通過する金属管１の外
周面を溝付きプラグ４に圧迫し、金属管１の内面に連続
した溝付け加工を施す。さらに、縮管手段５，６の後段
に配置された引抜きダイス７，８で金属管１の空引きを
行うことにより、金属管１は所定の外径寸法に仕上げら
れる。FIG. 3 shows a method for manufacturing an inner grooved tube. The metal tube 1 is passed through holding dies 9 pressing means 5 and 6 and drawing dies 7 and 8. The floating plug 2, the connecting rod 3 connected to the floating plug 2, and the grooved plug 4 connected to the rear end of the connecting rod 3 are inserted into the metal tube 1 and moved, thereby moving the floating plug 2.
Is held by the holding die 9, and the grooved plug 4 is set at a position facing the pressing means 5, 6. Around the grooved plug 4, pressing means 5, 6 composed of a plurality of planetary-rotating rolls, balls and the like are disposed, and the outer circumference of the metal tube 1 passing through the opposing position by the pressing means 5, 6 is provided. The surface is pressed against the grooved plug 4, and a continuous groove is formed on the inner surface of the metal tube 1. Further, the metal tube 1 is emptied by the drawing dies 7, 8 arranged at the subsequent stage of the contraction means 5, 6, whereby the metal tube 1 is finished to a predetermined outer diameter.
【０００４】図４は、図３に示した溝付プラグ４の詳細
を示す。図４の（ａ）に示すように、溝付プラグ４は、
軸線Ｘに対し角度βを成した溝付き加工用（フィン部形
成用）の溝１０が所定のピッチにより外周面に設けられ
ている。また、図４の（ｂ）に示すように、溝付プラグ
４は、溝側面１１の成す角度がα、開口部がＷ２、溝１
０の溝深さがＨｆとなるように加工されている。溝１０
が加工されずに溝１０間に残された突起部１２の幅はＷ
３となる。FIG. 4 shows details of the grooved plug 4 shown in FIG. As shown in FIG. 4A, the grooved plug 4 is
Grooves 10 for processing with grooves (for forming fins) having an angle β with respect to the axis X are provided on the outer peripheral surface at a predetermined pitch. As shown in FIG. 4B, the grooved plug 4 has an angle α formed by the groove side surface 11, an opening W2, and the groove 1
The groove is machined so that the groove depth of 0 becomes Hf. Groove 10
The width of the protrusion 12 left between the grooves 10 without being processed is W
It becomes 3.
【０００５】近年、伝熱性能向上の観点から、内面溝付
伝熱管内のフイン高さが高くする傾向にあり、フィン側
面の成す角度（＝溝側面１１の成す角度α）が小さくな
っている。これにともなって、溝付プラグ４は、内面溝
付管内のフィンに対応する溝１０が深くなり、角度αも
小さくなっている。このような加工においては、内面溝
付伝熱管のフィンを所定の高さに形成するために、溝付
プラグ４ヘの抑圧が高くなり、溝付プラグ４の突起部１
２の一部が欠落する所謂プラグ欠けが生じ易くなる。In recent years, from the viewpoint of improving the heat transfer performance, the fin height in the heat transfer tube with inner grooves has been increasing, and the angle formed by the side surfaces of the fins (= the angle α formed by the groove side surfaces 11) has become smaller. . Accordingly, in the grooved plug 4, the groove 10 corresponding to the fin in the inner surface grooved pipe is deepened, and the angle α is also reduced. In such processing, since the fins of the inner surface grooved heat transfer tube are formed at a predetermined height, the suppression of the grooved plug 4 is increased, and the protrusion 1 of the grooved plug 4 is formed.
That is, a so-called plug chipping in which a part of the plug 2 is missing easily occurs.
【０００６】図５はプラグ欠けの一例を示し、溝付プラ
グ４の突起部１２が溝底部より欠落した様子を示してい
る。プラグ欠けは、突起部１２に掛かる荷重の増加によ
って生じる。これを〔表１〕に示す形状の溝付プラグに
よって説明する。ここでは、Ａ，Ｂの２種類の形状の溝
付プラグを金属管（銅管）内に入れ、銅管外表面を圧縮
することで、圧縮荷重と銅管内面に形成するフィンの高
さを調査した。FIG. 5 shows an example of chipping of the plug, in which the projection 12 of the grooved plug 4 is missing from the groove bottom. The chipping of the plug is caused by an increase in the load applied to the protrusion 12. This will be described with reference to a grooved plug having the shape shown in Table 1. Here, two types of grooved plugs A and B are put in a metal tube (copper tube), and the outer surface of the copper tube is compressed to reduce the compression load and the height of the fin formed on the inner surface of the copper tube. investigated.
【０００７】[0007]
【表１】 [Table 1]
【０００８】図６は、〔表１〕における溝付プラグＡ，
Ｂによるフィンの高さ（ｍｍ）と荷重（ｋＮ）の関係を
示す。溝開口部幅Ｗ２は、溝１０の角度αが小さくなれ
ば小さくなり、小さいほど伝熱性能は向上する。溝付プ
ラグＡ，Ｂ共に、形状比率を示すＷ２／（Ｈｆ×Ｗ３）
の値が小さいと、図６に示すように、フィンを目標の高
さに形成するための圧縮荷重が高くなる。これは、溝深
さＨｆ、プラグ突起部幅Ｗ３が同じで溝開口部幅Ｗ２が
小さいと、伝熱管のフィン高さが同じでも、溝開口部幅
Ｗ２が小さい溝付プラグ４を用いた場合には、溝付プラ
グ４に銅管（金属管１）を押し付ける荷重が高くなるこ
とを意味している。即ち、フィン先端角度が小さいタイ
プの高性能伝熱管は、溝付け加工の際、溝付プラグ４に
押し付ける荷重が高くなる。FIG. 6 shows the grooved plugs A, [Table 1].
The relationship between the height (mm) of the fin and the load (kN) by B is shown. The groove opening width W2 decreases as the angle α of the groove 10 decreases, and the heat transfer performance improves as the angle α decreases. W2 / (Hf × W3) indicating the shape ratio for both grooved plugs A and B
Is small, the compressive load for forming the fin at the target height increases as shown in FIG. This is because when the groove depth Hf and the plug protrusion width W3 are the same and the groove opening width W2 is small, the grooved plug 4 having a small groove opening width W2 is used even if the fin height of the heat transfer tube is the same. Means that the load for pressing the copper tube (metal tube 1) against the grooved plug 4 increases. That is, in the case of a high-performance heat transfer tube of a type having a small fin tip angle, the load pressing against the grooved plug 4 becomes high during the groove forming process.
【０００９】[0009]
【発明が解決しようとする課題】しかし、従来の内面溝
付管の製造方法によると、Ｗ２／（Ｈｆ×Ｗ３）が小さ
い溝付プラグの場合、溝付プラグに掛かる押し付け圧が
高く、また、押圧手段５，６の回転により加圧力が付与
されるため、材料が溝部へ流れ込む際、溝付プラグ４の
溝側面１１に大きな荷重が掛かることになる。この荷重
によって、溝付プラグ４の突起部１２は曲げ力を受ける
結果、溝１０の底部に引張力が作用し、プラグ欠けに至
って断管や製品不良を生じさせ、生産性の低下を招くほ
か、資源の有効利用が図れなくなる。また、溝付プラグ
４の溝１０を深くして角度αを小さくした場合、溝１０
への材料の流れ込みが悪くなり、内面溝付管のフィンを
所定の高さにすることが難しくなるため、加工性が低下
し、生産性を悪化させる。However, according to the conventional method for manufacturing an inner grooved pipe, in the case of a grooved plug having a small W2 / (Hf × W3), the pressing pressure applied to the grooved plug is high, and Since the pressing force is applied by the rotation of the pressing means 5 and 6, a large load is applied to the groove side surface 11 of the grooved plug 4 when the material flows into the groove. As a result of this load, the protruding portion 12 of the grooved plug 4 receives a bending force, and as a result, a tensile force acts on the bottom of the groove 10, which leads to chipping of the plug, causing disconnection and defective products, and lowering productivity. As a result, effective use of resources cannot be achieved. When the angle α is reduced by making the groove 10 of the grooved plug 4 deep, the groove 10
Since the flow of the material into the pipe becomes worse and it becomes difficult to set the fin of the inner surface grooved pipe to a predetermined height, workability is reduced and productivity is deteriorated.
【００１０】したがって、本発明の目的は、溝付プラグ
のプラグ欠けを無くし、伝熱性能の高い内面溝付管の生
産性向上及び資源の有効利用が可能な内面溝付管の製造
方法を提供することにある。Accordingly, an object of the present invention is to provide a method of manufacturing an inner grooved tube capable of improving the productivity of an inner grooved tube having high heat transfer performance and effectively utilizing resources by eliminating the plug chipping of the grooved plug. Is to do.
【００１１】[0011]
【課題を解決するための手段】本発明は、上記の目的を
達成するため、フローティングプラグと前記フローティ
ングプラグに連結部材を介して連結されると共に材料に
超硬合金を用いた溝付プラグを金属管に内挿し、前記金
属管を引き抜きする過程で押圧手段により前記金属管を
前記溝付きプラグに押圧することにより前記金属管の内
面に複数の溝を形成することを特徴とする内面溝付管の
製造方法を提供する。SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a floating plug and a grooved plug which is connected to the floating plug via a connecting member and which uses a cemented carbide as a material. A plurality of grooves are formed on the inner surface of the metal tube by pressing the metal tube against the grooved plug by pressing means in a process of inserting the metal tube into the tube and pulling out the metal tube. And a method for producing the same.
【００１２】この方法によれば、材料に超硬合金を用い
た溝付プラグを用いて金属管の内面に複数の溝を形成す
るようにしたため、超硬合金によって溝付プラグの強度
が高められ、溝付プラグのプラグ欠けが防止される。プ
ラグ欠けの解消により、断管や製品不良が低減して生産
性の向上が可能になり、更に、資源の有効利用が図れる
ようになる。According to this method, since the plurality of grooves are formed on the inner surface of the metal tube using the grooved plug using a cemented carbide as a material, the strength of the grooved plug is increased by the cemented carbide. Also, the chipping of the grooved plug is prevented. Eliminating the lack of plugs can reduce disconnection and product defects, improve productivity, and achieve more efficient use of resources.
【００１３】[0013]
【発明の実施の形態】以下、本発明の実施の形態につい
て図面を基に説明する。本発明の内面溝付管の製造方法
は、図３で説明した従来の製造方法と同一であるので、
ここでは説明は省略する。本発明者らは、溝付プラグ４
の強度を上げ、プラグ欠けの発生を抑えることのできる
プラグ材質について種々検討した。その結果、主成分で
あるタングステンカーバイド（ＷＣ）の粒度が０．５μ
ｍ以下、抗析力が３，４００Ｎ／ｍｍ2 以上、引張強さ
が１，９００Ｎ／ｍｍ2 以上、及び圧縮強さが４，２０
０Ｎ／ｍｍ 2 以上を有する超硬合金を用いることによ
り、好結果が得られることを見いだした。プラグ材料と
して上記超硬合金（材質ｂ）を用いた本発明の溝付プラ
グと、従来のプラグ材料（材質ａ）による溝付プラグの
機械的特性を示したのが〔表２〕である。〔表２〕から
明らかなように、本発明の溝付プラグは従来の溝付プラ
グに比べ、抗析力、引張強さ、及び圧縮強さが高く、タ
ングステンカーバイド（ＷＣ）の粒度が小さくなってい
ることがわかる。BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described.
This will be described with reference to the drawings. Method for manufacturing inner grooved pipe of the present invention
Is the same as the conventional manufacturing method described with reference to FIG.
The description is omitted here. The present inventors have proposed a grooved plug 4
Of the plug can be reduced, and the occurrence of plug chipping can be suppressed.
Various investigations were made on plug materials. As a result,
Some tungsten carbide (WC) has a particle size of 0.5μ
m or less, anti-deposition force is 3,400 N / mmTwoAbove, tensile strength
Is 1,900 N / mmTwoAbove and a compressive strength of 4,20
0N / mm TwoBy using a cemented carbide having the above
And found good results. With plug material
And the grooved plastic of the present invention using the above cemented carbide (material b)
Of the grooved plug with the conventional plug material (material a)
Table 2 shows the mechanical characteristics. From [Table 2]
As can be seen, the grooved plug of the present invention is a conventional grooved plug.
Higher precipitation resistance, tensile strength, and compressive strength than
The particle size of tungsten carbide (WC) is small
You can see that
【００１４】[0014]
【表２】 [Table 2]
【００１５】次に、溝付プラグ４の寸法を〔表３〕のよ
うにし、また、溝付プラグ４の材料は〔表２〕の材質ｂ
及び材質ａを用いた。この溝付プラグ４を用いて金属管
１の内面にフィンを形成する際の押し付け荷重の変化を
測定した。Next, the dimensions of the grooved plug 4 are set as shown in [Table 3], and the material of the grooved plug 4 is the material b shown in [Table 2].
And material a. Using this grooved plug 4, a change in the pressing load when fins were formed on the inner surface of the metal tube 1 was measured.
【表３】 [Table 3]
【００１６】図１は、〔表３〕の溝付プラグ４を用いた
本発明と従来の溝付プラグのフィン高さと押し込み荷重
の比率の関係を示す。図１から明らかなように、本発明
の溝付プラグ（一点鎖線の特性）は、破壊荷重（Ｗｂ）
に対して、目標のフィン高さに形成する際の押し込み荷
重（Ｗｆ）の比率（Ｗｆ／Ｗｂ）が、従来の溝付プラグ
（実線）より小さくなっている。これは、本発明のプラ
グが従来のプラグよりも破壊し難いことを示している。FIG. 1 shows the relationship between the fin height and the ratio of the indentation load of the present invention and the conventional grooved plug using the grooved plug 4 shown in [Table 3]. As is clear from FIG. 1, the grooved plug of the present invention (characteristic indicated by a dashed line) has a breaking load (Wb).
On the other hand, the ratio (Wf / Wb) of the indentation load (Wf) when forming at the target fin height is smaller than that of the conventional grooved plug (solid line). This indicates that the plug of the present invention is harder to break than the conventional plug.
【００１７】〔表４〕は、〔表２〕に示した材質による
従来と本発明の溝付プラグの形状及びプラグ欠け発生率
を示す。Table 4 shows the shapes of the grooved plugs of the prior art and the present invention and the rate of occurrence of chipping of the plugs according to the materials shown in Table 2.
【表４】 ここで、プラグ欠け率は、各形状（プラグ番号Ｐ１〜Ｐ
７）共に内面溝付管の加工に用いたプラグ数（Ｎｔ）＝
５０個に対して、プラグ欠けが発生したプラグ数（Ｎ
Ｐ）の比（ＮＰ／Ｎｔ）で表している。〔表４〕から明
らかなように、従来の溝付プラグは、形状比率｛＝Ｗ２
／（Ｈｆ×Ｗ３）｝が５以下になるとプラグ欠けを発生
する。一方、本発明の溝付プラグは、形状比率にかかわ
らず、プラグ欠けの発生は見られなかった。[Table 4] Here, the plug chipping rate is determined for each shape (plug numbers P1 to P
7) Number of plugs (Nt) used for processing the inner grooved tube =
For 50 plugs, the number of plugs (N
P) (NP / Nt). As is clear from Table 4, the conventional grooved plug has a shape ratio ｛= W2
When / (Hf × W3)} is 5 or less, plug missing occurs. On the other hand, the grooved plug of the present invention did not show any chipping of the plug regardless of the shape ratio.
【００１８】図２は、〔表４〕における従来の溝付プラ
グのプラグ欠け発生率特性を示す。図２は〔表４〕のプ
ラグ番号Ｐ２〜Ｐ５をもとに作成したものである。形状
比率Ｗ２／（Ｈｆ×Ｗ３）が５〜５．５以下になるとプ
ラグ欠け率は顕著になり、Ｗ２／（Ｈｆ×Ｗ３）の値が
小さくなるに従ってプラグ欠け率が大きくなることがわ
かる。しかし、本発明の溝付プラグ４によれば、５．０
以下のＷ２／（Ｈｆ×Ｗ３）にする仕様も推奨できるこ
とになる。FIG. 2 shows the characteristics of the occurrence of chipping of the conventional grooved plug shown in Table 4. FIG. 2 is created based on the plug numbers P2 to P5 in [Table 4]. It can be seen that when the shape ratio W2 / (Hf × W3) becomes 5 to 5.5 or less, the plug chipping rate becomes significant, and as the value of W2 / (Hf × W3) decreases, the plug chipping rate increases. However, according to the grooved plug 4 of the present invention, 5.0.
The following specification of W2 / (Hf × W3) can also be recommended.
【００１９】以上においては、内面溝付管の溝付プラグ
の製造方法について説明したが、溝付ロールによりエン
ボス圧延を行い、その圧延材フォーミング後、溶接によ
り溝付管を製造する方法における溝付ロールについて
も、本発明を適用可能である。In the above, the method of manufacturing the grooved plug of the inner surface grooved tube has been described. However, embossing is performed by a grooved roll, and after forming the rolled material, the grooved method is manufactured by welding. The present invention is also applicable to rolls.
【００２０】[0020]
【発明の効果】以上より明らかなように、本発明によれ
ば、フローティングプラグと前記フローティングプラグ
に連結部材を介して連結され溝付プラグを金属管に内挿
し、前記金属管を引き抜きする過程で押圧手段により前
記金属管を前記溝付プラグに押圧することにより前記金
属管の内面に複数の溝を形成する内面溝付管の製造方法
において、溝付プラグの材料に超硬合金を用いたため、
溝付プラグの強度が高められ、溝付プラグのプラグ欠け
が防止されるため、断管や製品不良が低減して生産性の
向上が可能になり、更に、資源の有効利用が図れるよう
になる。特に、伝熱性能の高い伝熱管の製造において
は、生産性の向上によりコスト低減が図れるので、最終
的には、高性能な空調設備を安価に提供できるようにな
り、更に、地球環境の保全にも寄与する。As is apparent from the above, according to the present invention, the floating plug and the grooved plug connected to the floating plug via the connecting member are inserted into the metal tube, and the process of pulling out the metal tube is performed. In the method for manufacturing an inner grooved tube in which a plurality of grooves are formed on the inner surface of the metal tube by pressing the metal tube against the grooved plug by pressing means, since a cemented carbide is used as a material of the grooved plug,
Since the strength of the grooved plug is enhanced and the plug of the grooved plug is prevented from being chipped, disconnection and defective products are reduced, productivity can be improved, and more effective use of resources can be achieved. . In particular, in the production of heat transfer tubes with high heat transfer performance, costs can be reduced by improving productivity, so that ultimately, high-performance air conditioning equipment can be provided at low cost, and furthermore, the preservation of the global environment Also contributes.
【図１】本発明及び従来の溝付プラグにおけるフィン高
さ対押し込み荷重の比率の特性を示す特性図である。FIG. 1 is a characteristic diagram showing characteristics of a ratio of a fin height to a pushing load in a grooved plug of the present invention and a conventional grooved plug.
【図２】従来の溝付プラグにおけるプラグ欠け発生率を
示す特性図である。FIG. 2 is a characteristic diagram showing a plug chipping occurrence rate in a conventional grooved plug.
【図３】内面溝付管の製造方法を示す製造装置の断面図
である。FIG. 3 is a sectional view of a manufacturing apparatus showing a method for manufacturing an inner grooved pipe.
【図４】図３に示した溝付きプラグを示す正面図であ
る。FIG. 4 is a front view showing the grooved plug shown in FIG. 3;
【図５】プラグ欠けの一例を示す写真である。FIG. 5 is a photograph showing an example of a missing plug.
【図６】本発明（プラグＡ）と従来（プラグＢ）の溝付
プラグにおけるフィンの高さと荷重の関係を示す特性図
である。FIG. 6 is a characteristic diagram showing a relationship between a fin height and a load in the grooved plug of the present invention (plug A) and the conventional (plug B).
１ 金属管 ２ フローティングプラグ ３ 連結棒 ４ 溝付プラグ ５，６ 縮管手段 ７，８ 引抜きダイス ９ 保持ダイス １０ 溝 DESCRIPTION OF SYMBOLS 1 Metal tube 2 Floating plug 3 Connecting rod 4 Plug with groove 5, 6 Contraction means 7, 8 Drawing die 9 Holding die 10 Groove
───────────────────────────────────────────────────── フロントページの続き (72)発明者 於本 秀人 茨城県土浦市木田余町3550番地 日立電線 株式会社土浦工場内 (72)発明者 永井 淳 茨城県土浦市木田余町3550番地 日立電線 株式会社土浦工場内 Ｆターム(参考） 4E096 EA18 FA02 FA03 FA18 FA24 FA30 GA03 HA16 ──────────────────────────────────────────────────の Continuing on the front page (72) Inventor Hideto Omoto 3550 Kida Yomachi, Tsuchiura City, Ibaraki Prefecture Within Hitachi Cable Co., Ltd. F-term in Tsuchiura Works Co., Ltd. (reference) 4E096 EA18 FA02 FA03 FA18 FA24 FA30 GA03 HA16
Claims (4)
ングプラグに連結部材を介して連結されると共に材料に
超硬合金を用いた溝付プラグを金属管に内挿し、 前記金属管を引き抜きする過程で押圧手段により前記金
属管を前記溝付プラグに押圧することにより前記金属管
の内面に複数の溝を形成することを特徴とする内面溝付
管の製造方法。1. A floating plug and a grooved plug which is connected to the floating plug via a connecting member and which uses a cemented carbide as a material are inserted into a metal tube, and a pressing means is used in a process of pulling out the metal tube. A method for manufacturing an inner surface grooved tube, wherein a plurality of grooves are formed on an inner surface of the metal tube by pressing the metal tube against the grooved plug.
テンカーバイド（ＷＣ）の粒度が０．５μｍ以下、抗析
力が３，４００Ｎ／ｍｍ２以上、引張強さが１，９００
Ｎ／ｍｍ２以上、圧縮強さが４，２００Ｎ／ｍｍ２以上
であることを特徴とする請求項１記載の内面溝付管の製
造方法。2. The cemented carbide has tungsten carbide (WC) as a main component having a particle size of 0.5 μm or less, a cohesive strength of 3,400 N / mm 2 or more, and a tensile strength of 1,900.
The method for producing an inner grooved pipe according to claim 1, wherein the compression strength is not less than N / mm2 and the compression strength is not less than 4,200 N / mm2.
２、溝深さをＨｆ、溝付プラグ突起部１個の外周面の長
さをＷ３とするとき、Ｗ２／（Ｈｆ×Ｗ３）の値が５以
下であることを特徴とする請求項１記載の内面溝付管の
製造方法。3. The grooved plug has a groove opening length of W
2. The value of W2 / (Hf × W3) is 5 or less, where the groove depth is Hf and the length of the outer peripheral surface of one grooved plug projection is W3. Method for manufacturing an inner grooved pipe.
溝が形成された金属管を、３５％以下の加工度による空
引き加工して、外径１０ｍｍ以下の目標外径に加工する
ステップを含むこと特徴とする請求項１記載の内面溝付
管の製造方法。4. A step subsequent to the drawing step, wherein a metal pipe having a groove formed on an inner surface is subjected to an empty drawing process with a working degree of 35% or less to form a target outer diameter of an outer diameter of 10 mm or less. The method for manufacturing an inner grooved pipe according to claim 1, further comprising:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000302282A JP2002102916A (en) | 2000-10-02 | 2000-10-02 | Method for manufacturing inside grooved tube |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000302282A JP2002102916A (en) | 2000-10-02 | 2000-10-02 | Method for manufacturing inside grooved tube |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2002102916A true JP2002102916A (en) | 2002-04-09 |
Family
ID=18783661
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2000302282A Pending JP2002102916A (en) | 2000-10-02 | 2000-10-02 | Method for manufacturing inside grooved tube |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2002102916A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009101405A (en) * | 2007-10-25 | 2009-05-14 | Hitachi Cable Ltd | Method of manufacturing high pressure-tight heat transfer tube with internal groove |
| JP2009279614A (en) * | 2008-05-22 | 2009-12-03 | Sanyo Special Steel Co Ltd | Method of manufacturing wire rod |
-
2000
- 2000-10-02 JP JP2000302282A patent/JP2002102916A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009101405A (en) * | 2007-10-25 | 2009-05-14 | Hitachi Cable Ltd | Method of manufacturing high pressure-tight heat transfer tube with internal groove |
| JP2009279614A (en) * | 2008-05-22 | 2009-12-03 | Sanyo Special Steel Co Ltd | Method of manufacturing wire rod |
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