JPH03198910A - Reducing method of continuously casted material - Google Patents
Reducing method of continuously casted materialInfo
- Publication number
- JPH03198910A JPH03198910A JP34219089A JP34219089A JPH03198910A JP H03198910 A JPH03198910 A JP H03198910A JP 34219089 A JP34219089 A JP 34219089A JP 34219089 A JP34219089 A JP 34219089A JP H03198910 A JPH03198910 A JP H03198910A
- Authority
- JP
- Japan
- Prior art keywords
- reducing
- continuous casting
- punching
- tip side
- continuously casted
- 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.)
- Pending
Links
- 239000000463 material Substances 0.000 title claims abstract description 52
- 238000000034 method Methods 0.000 title claims description 17
- 238000001192 hot extrusion Methods 0.000 claims abstract description 11
- 238000004080 punching Methods 0.000 claims description 25
- 239000002994 raw material Substances 0.000 claims description 3
- 230000010355 oscillation Effects 0.000 abstract description 17
- 238000009749 continuous casting Methods 0.000 description 28
- 229910000831 Steel Inorganic materials 0.000 description 4
- 238000005520 cutting process Methods 0.000 description 4
- 235000012438 extruded product Nutrition 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- 230000007547 defect Effects 0.000 description 3
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- 229920000297 Rayon Polymers 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000004886 process control Methods 0.000 description 1
- 239000002964 rayon Substances 0.000 description 1
Landscapes
- Extrusion Of Metal (AREA)
- Metal Extraction Processes (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野］
本発明は、連続鋳造材を素材として熱間押出し加工を行
うに際して、前記連続鋳造材にダイス押抜き縮径真円化
加工を施す連続鋳造材の押抜き加工方法に関する。Detailed Description of the Invention (Industrial Field of Application) The present invention relates to a continuous casting process in which, when performing hot extrusion processing using a continuous casting material as a raw material, the continuous casting material is subjected to die punching and diameter reduction processing. This article relates to a method for punching materials.
（従来の技術〕
最近の連続鋳造技術の発達により、ステンレス鋼やその
他の合金鋼等の鋼棒についても、高品質な円形断面の連
続鋳造材の製造が可能になり、これを背景として、ステ
ンレス鋼やその他の合金鋼の連続鋳造材より管、丸棒等
の熱間押出し製品を直接製造することが行われ始めた。(Prior technology) With the recent development of continuous casting technology, it has become possible to manufacture high-quality continuous casting materials with a circular cross section for steel bars such as stainless steel and other alloy steels. Direct manufacturing of hot extruded products such as pipes and round bars from continuous casting materials of steel and other alloy steels has begun.
熱間押出し製品の素材として連続鋳造材を用いると、熱
間分塊圧延工程が不要となり、熱間押出し製品の製造コ
ストが著しく引き下げられる。When a continuous casting material is used as a material for a hot extruded product, a hot blooming process is not necessary, and the manufacturing cost of the hot extruded product is significantly reduced.
しかし、連続鋳造材がステンレス鋼やその他の合金鋼の
場合には、熱間押出し製品の表面にスジ状の欠陥が発生
し、製品価値を著しく下落させることが知られており、
その対策として、例えば特開昭６０−２２１１２１号公
報には、熱間押出し加工に先だって、連続鋳造材に、加
熱により内質まで結晶粒が細粒化されるに足る加工度の
ダイス押抜き縮径真円化加工を施すことが開示されてい
る。そして、押抜き加工を受けた連続鋳造材から複数本
の熱間押出し用丸ビレットが採取される。However, when the continuous casting material is stainless steel or other alloy steel, it is known that streak-like defects occur on the surface of the hot extruded product, significantly reducing the product value.
As a countermeasure against this, for example, Japanese Patent Application Laid-open No. 60-221121 discloses that prior to hot extrusion, a continuous cast material is subjected to extrusion shrinkage using a die with a working degree sufficient to refine the crystal grains down to the internal quality by heating. It is disclosed that the diameter is rounded. Then, a plurality of round billets for hot extrusion are collected from the continuous casting material that has undergone the punching process.
熱間押出し素材としての連続鋳造材に上記の如き押抜き
加工を施すと、連続鋳造材の先端面が現れる熱間押出し
製品の先端部外表面にもスジ状の欠陥を生しるおそれが
なく、他の対策と比べて製品歩留りが一層改善される。When the above-described punching process is performed on a continuous casting material as a hot extrusion material, there is no risk of streak-like defects occurring on the outer surface of the tip of the hot extrusion product where the tip surface of the continuous casting material appears. , product yield is further improved compared to other measures.
また、押抜き加工によって連続鋳造材の真円度が高まり
、熱間押出し用ビレットとするためのヒレント採取］１
稈において、外面切削代を少なくできる利点もある。In addition, the roundness of the continuous casting material is increased by the punching process, and the roundness of the continuous casting material is increased, and Hirent extraction is used to make billets for hot extrusion]1
There is also the advantage that the cutting allowance for the outer surface of the culm can be reduced.
〔発明が解決しようとする課題］
しかしながら、連続鋳造材に押抜き加工を施すと、第１
図に示すように、連続鋳造材１の表面に形成されていた
オシレーションマーク２がダイス３を通過する際に拡開
して表面割れ４に至ることがある。この表面割れ４は、
第１同では若干誇張されているものの、それでもｆｆい
ものは７ｍｍにも達し、ピレノ） １ｆｆｉ取工程にお
いて外面切削代を増大させる要因になっ“ζいる。[Problems to be solved by the invention] However, when a continuous casting material is subjected to punching, the first
As shown in the figure, the oscillation marks 2 formed on the surface of the continuous casting material 1 may expand when passing through the die 3, resulting in surface cracks 4. This surface crack 4 is
Although it is slightly exaggerated in the first version, the thickness of the ff is still as high as 7 mm, which is a factor that increases the external cutting allowance in the 1ffi removal process (Pireno).
本発明は、上記事情に本みなされたもので、オシレーシ
ョンマークを起点とする表面割れを防＋Ｉ−し得る連Ｖ
ｔ鋳造材の押抜き加工方法を提供することを目的とする
。The present invention has been made in view of the above circumstances, and is a combination V that can prevent surface cracking starting from oscillation marks.
The object of the present invention is to provide a method for punching a cast material.
［課題を解決するための手段］
連続鋳造材に押抜き加工を施した場合に、連続鋳造材の
オシレーションマークを起点として生しる表面割れは、
必す生じるというものではない。[Means for solving the problem] When continuous casting material is subjected to punching, surface cracks that occur starting from the oscillation marks of the continuous casting material,
It does not necessarily occur.
例えば、顕著なオシレーションマークが生じているにも
かかわらす表面割れが全く発生しないこともある。本発
明者らは、オシレーションマークを起点とする表面割れ
が突発的に生しることに着目して、連続鋳造材とその押
抜き加工条件との関連について調査したところ、連続鋳
造材が製造される際の鋳片引抜き方向と、押抜き加工に
おける連続鋳造材の押抜き方向との関係が、表面割れの
発生を支配しでいることが判明した。For example, there may be no surface cracking at all even though there are noticeable oscillation marks. The present inventors focused on the sudden occurrence of surface cracks originating from oscillation marks, and investigated the relationship between continuous casting materials and their punching conditions. It has been found that the relationship between the direction in which the slab is pulled out during punching and the direction in which the continuously cast material is punched out during the punching process controls the occurrence of surface cracks.
すなわち、連続鋳造材の表面に生じるオシレーンヨンマ
ークは、第２図に示すように、その製造段階での鋳片引
抜き方向とは逆の方向に傾斜しており、オシレーション
マークの傾斜方向に連続鋳造材が押抜かれた場合にのみ
、材料表面とダイス内面との間に作用する摩擦および剪
断力によって、第１図の如（オシレーションマークが拡
開するのである。この現象は、木材をかんなで削る際の
逆目皮削り現象に酷似しており、オシレーションマーり
の傾斜方向に対して逆の方向に連続鋳造材が押抜かれた
場合には、オシレーションマークの程度にかかわらず、
それが表面割れに発展することはない。In other words, as shown in Figure 2, the oscillation marks that occur on the surface of continuous casting materials are inclined in the opposite direction to the direction in which the slab is pulled out at the manufacturing stage, and Only when a continuous cast material is punched out, the oscillation marks expand as shown in Figure 1 due to the friction and shear forces acting between the material surface and the inner surface of the die. This phenomenon is very similar to the reverse grain shaving phenomenon that occurs when shaving with a planer, and when a continuous cast material is punched out in the opposite direction to the inclination direction of the oscillation mark, regardless of the degree of the oscillation mark,
It will not develop into surface cracks.
本発明は上記知見に基づきなされたもので、連続鋳造材
を素材として熱間押出し加工を行うに際して、前記連続
鋳」間材にダイス押抜き縮径真円化加工を施ず連）！１
ｈｌａ材の押抜き加工方法であって、前記連続鋳造材に
対するダイス押抜き縮径真円化加圧を、ｔｉｉｌ記連続
鋳造材の鋳片引抜き先端側を押抜き加工先端側にして行
うことを特徴とする連続鋳造材の押抜き加工を要旨とす
る。The present invention has been made based on the above-mentioned knowledge, and when performing hot extrusion processing using a continuous casting material as a raw material, the continuous casting material is not subjected to die punching and diameter reduction processing. 1
A method for punching HLA material, wherein pressurization of the continuous casting material to reduce its diameter by pressing with a die is performed with the tip side of the continuous casting material when the slab is drawn out facing the tip side of the punching process. This paper focuses on the characteristic punching process of continuous casting materials.
（作 用〕
連続鋳造材の引抜き先端側を押抜き加工先端側にして、
その連続鋳造材をダイス押抜き加工することにより、連
続鋳造材の押抜き方向がオシレーンヨンマークの傾斜方
向に対して逆になり、オシレーションマークの拡開が防
止される。(Function) With the drawing end side of the continuous casting material facing the punching processing end side,
By punching the continuous cast material with a die, the direction of punching the continuous cast material is reversed to the direction of inclination of the oscillation mark, thereby preventing the oscillation mark from expanding.
（実施例）
ＳＵＳ３２１よりなる外径２２２ｍｍ、長さ３５００ｆ
ｆｌＩ１１の連続鋳造材に、内径が２１６−のダイスに
て押抜き加工を施すに際し、連続鋳造材の鋳片引抜き方
向とは逆の方向に連続鋳造材をダイスに挿通させた場合
は、オシレーションマークを起点として最大深さが７ｍ
ｍの表面割れが生じたが、その連続鋳造材をその鋳片引
抜き方向に押抜いた場合は、表面割れは全く認められな
かった。その結果、押抜き後の連続鋳造材より熱間押出
し用ビレットを採取するためのビレット採取工程におい
て、外面切削代を１５鵬から９Ｗａに減少させることが
できた。そして、採取された丸ビレ・ノド（外径２０７
順、内径４７ｍｍ、長さ６００間）より熱間押出し加工
によって外径５４ｍｍ、肉厚ｔｏｍｍ、長さ５３００ｎ
ｍを製造したところ、その製品の全長にわたってスジ状
の表面欠陥は生じなかった。(Example) Made of SUS321, outer diameter 222mm, length 3500f
When punching flI11 continuous casting material using a die with an inner diameter of 216mm, if the continuous casting material is inserted through the die in the direction opposite to the direction in which the continuous casting material is pulled out, oscillation may occur. Maximum depth is 7m starting from the mark
However, when the continuous cast material was punched out in the slab drawing direction, no surface cracks were observed at all. As a result, in the billet collection step for collecting billets for hot extrusion from the continuously cast material after punching, the outer surface cutting allowance was able to be reduced from 15 mm to 9 Wa. Then, the collected round fin and throat (outer diameter 207
(inner diameter: 47mm, length: 600mm) to outer diameter: 54mm, wall thickness: tomm, length: 5300n by hot extrusion processing
When No. m was manufactured, no streak-like surface defects occurred over the entire length of the product.
以上の説明から明らかなように、本発明の押抜き加工方
法は、オシレーションマークを起点とする表面割れを確
実にかつ簡単に防止することができ、これにより外面切
削代の低減を図って、歩留り改善に大きく貢献する。As is clear from the above explanation, the punching method of the present invention can reliably and easily prevent surface cracks starting from oscillation marks, thereby reducing the outer surface cutting allowance. This greatly contributes to yield improvement.
第１図はオシレーションマークを起点とする表向割れの
発生状況を示す模式図、第２図はオシレーションマーク
の発イロ状況と鋳片引抜き方向との関係を示す模式図で
ある。
１ ： ［ｕＡ造材、２ニオツレ−ジョンマーク、３：
ダイス、４：表面割れ。
５９
押抜き方向
引抜き方向FIG. 1 is a schematic diagram showing the occurrence of surface cracks starting from oscillation marks, and FIG. 2 is a schematic diagram showing the relationship between the occurrence of eroding of the oscillation marks and the direction in which the slab is pulled out. 1: [uA lumber, 2 niots-rayon marks, 3:
Dice, 4: Surface crack. 59 Push-out direction Pull-out direction
Claims (1)
際して、前記連続鋳造材にダイス押抜き縮径真円化加工
を施す連続鋳造材の押抜き加工方法であって、前記連続
鋳造材に対するダイス押抜き縮径真円化加工を、前記連
続鋳造材の鋳片引抜き先端側を押抜き加工先端側にして
行うことを特徴とする連続鋳造材の押抜き加工方法。(1) A method for extruding a continuous cast material, in which the continuous cast material is subjected to die punching and diameter reduction processing when hot extrusion is performed using the continuous cast material as a raw material, the method comprising: A method for punching a continuous cast material, characterized in that die punching to reduce the diameter to a round shape is carried out with the tip side of the continuous cast material when the slab is drawn to the tip side of the punching process.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP34219089A JPH03198910A (en) | 1989-12-27 | 1989-12-27 | Reducing method of continuously casted material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP34219089A JPH03198910A (en) | 1989-12-27 | 1989-12-27 | Reducing method of continuously casted material |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH03198910A true JPH03198910A (en) | 1991-08-30 |
Family
ID=18351816
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP34219089A Pending JPH03198910A (en) | 1989-12-27 | 1989-12-27 | Reducing method of continuously casted material |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH03198910A (en) |
-
1989
- 1989-12-27 JP JP34219089A patent/JPH03198910A/en active Pending
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