JPS63130268A - Hot scarfing method - Google Patents
Hot scarfing methodInfo
- Publication number
- JPS63130268A JPS63130268A JP27541086A JP27541086A JPS63130268A JP S63130268 A JPS63130268 A JP S63130268A JP 27541086 A JP27541086 A JP 27541086A JP 27541086 A JP27541086 A JP 27541086A JP S63130268 A JPS63130268 A JP S63130268A
- Authority
- JP
- Japan
- Prior art keywords
- hot
- scarfing
- oxygen
- billet
- hot billet
- 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
- 238000000034 method Methods 0.000 title claims description 7
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 11
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 11
- 239000001301 oxygen Substances 0.000 claims abstract description 11
- 229910000831 Steel Inorganic materials 0.000 claims description 25
- 239000010959 steel Substances 0.000 claims description 25
- 239000002904 solvent Substances 0.000 claims description 17
- 238000003754 machining Methods 0.000 claims 1
- 239000000463 material Substances 0.000 description 9
- 238000005261 decarburization Methods 0.000 description 6
- 229910000677 High-carbon steel Inorganic materials 0.000 description 4
- 238000007796 conventional method Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000000275 quality assurance Methods 0.000 description 1
- 239000013557 residual solvent Substances 0.000 description 1
- 238000007665 sagging Methods 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 239000002436 steel type Substances 0.000 description 1
Landscapes
- Forging (AREA)
Abstract
Description
【発明の詳細な説明】
[産業上の利用分野コ
本発明は熱鋼片をホットスカーフマシンによって全面溶
削する時、角部の溶削残り防止を可能とした熱間溶削方
法に関するものである。[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a hot cutting method that makes it possible to prevent uncut corners from remaining when a heated steel billet is entirely cut by a hot scarf machine. be.
[従来の技術コ
熱鋼片のホットスカーフマシンによる全面溶削は上下面
及び両側面の溶削用火口ユニットを用いて行う。[Conventional technology The entire surface of a heated steel billet is melt-cut using a hot scarf machine using melt-cutting nozzle units on the top, bottom, and both sides.
火口ユニットからのガス噴出址は火ロユニット+i全長
にわたって均一になるようにしており、鋼種・温度など
熱鋼片の特性や所要の溶削深さによりガス圧や溶剤時の
熱鋼片通過スピードの設定値を変えているが、熱鋼片角
部の溶剤残りが見られる場合は,ガス圧を高くしたり、
熱鋼片通過スピードを下げたりして対抗するケースもあ
る。また特公昭57−5622号のように熱鋼片角部専
用の火口ユニットを別に設置し、角部の溶削量の向上を
図るなどの例がある。The gas ejected area from the crater unit is made to be uniform over the entire length of the crater unit, and the speed at which the hot billet passes when using gas pressure and solvent is determined by the properties of the hot billet such as steel type and temperature, and the required cutting depth. If you are changing the setting value of the hot steel sheet, but if solvent remains on the corner of the hot steel piece, increase the gas pressure or
In some cases, countermeasures include lowering the speed at which the hot steel billet passes. In addition, as in Japanese Patent Publication No. 57-5622, there is an example of installing a separate crater unit exclusively for the corner of a hot steel piece to improve the amount of cutting at the corner.
これら従来の方法には以下に示す問題点がある。These conventional methods have the following problems.
第2図はホットスカーフマシンによる溶削前後の鋼材の
断面形状を示す図であるが、図により問題点を説明すれ
ば,溶削前の鋼材断面形状8に対し、溶削後の鋼材断面
形状9は、辺の溶削量に比較して角部の溶削量が小さく
、溶削残りが発生している事がわかる。これは角部の温
度低下などによるものであるが、この角部のみが溶削さ
れずに残存するため、ビレットなどの圧延製品において
、ヘゲやシーム疵が残存するなどの問題点があった。Figure 2 is a diagram showing the cross-sectional shape of a steel material before and after melt cutting with a hot scarf machine.To explain the problem with the figure, the cross-sectional shape of the steel material 8 before melt cutting is different from the cross-sectional shape of the steel material after melt cutting. In No. 9, the amount of cutting on the corners is smaller than the amount of cutting on the sides, and it can be seen that there is some remaining material left after cutting. This is due to a drop in temperature at the corners, but since only these corners remain without being melted, there are problems such as sagging and seam flaws remaining in rolled products such as billets. .
また高炭素鋼材においては、脱炭はバネなどの疲労寿命
を低下させる事から線材の重要な品質項目であるが、ビ
レットでの脱炭が高炭素鋼線材の部分的脱炭になるなど
の問題があった。溶剤残りの状況によっては、1ランク
溶剤址を上げるなどして対処するケースがあるが十分で
はなく、鋼片のグラインダー手入により角部の入念な手
入を必要とし、品質保証、コストの面で問題があった。In addition, in high carbon steel materials, decarburization is an important quality item for wire rods as it reduces the fatigue life of springs, etc. However, there are problems such as decarburization in billets resulting in partial decarburization of high carbon steel wire rods. was there. Depending on the situation with remaining solvent, there are cases where raising the solvent level by one rank is a solution, but this is not sufficient, and the corners need to be carefully cleaned by grinding the steel pieces, which is a problem in terms of quality assurance and cost. There was a problem.
[発明の目的コ
本発明はこれらの問題が生ずる原因となるところの熱細
片の角部の溶剤残り防止を可能とした熱間溶剤方法を堤
供するものである。[Object of the Invention] The present invention provides a hot solvent method that makes it possible to prevent solvent from remaining at the corners of hot strips, which is the cause of these problems.
本発明は熱鋼片をホットスカーフマシンによって全面溶
剤する際、熱鋼片寸法に対応する火口ユニット端部の酸
素流量を増加させる熱間溶剤方法である。The present invention is a hot solvent method for increasing the oxygen flow rate at the end of the nozzle unit corresponding to the size of the hot steel piece when the hot steel piece is completely solvent-treated by a hot scarf machine.
[問題点を解決するための手段、作用]第1図は本発明
法の1例の模式図で、熱鋼片の4面に配した火口ユニッ
トのうちの1ユニツトについてその断面を示した説明図
であり、以下第1図により本発明を説明すれば、熱間溶
剤時、火口ユニットは熱鋼片1にシュー2の部分で接触
しスライドして一定間隔を保ち溶剤駄を安定させている
。[Means and effects for solving the problems] Figure 1 is a schematic diagram of one example of the method of the present invention, and is an explanation showing a cross section of one of the crater units arranged on the four sides of a hot steel piece. The present invention will be explained below with reference to FIG. 1. During hot solvent use, the nozzle unit contacts the hot steel piece 1 at the shoe 2 and slides to maintain a constant distance and stabilize the solvent drop. .
溶剤用酸素は酸素ピストン3による熱鋼片中に対応する
範囲においてマニホルド4からヘッド5.バッフルプレ
ート6を(例えば紙面の手前側及び裏側を)経てオリフ
ィスプレート7の直線に配置された小径のノズルから噴
出されるが、バッフルプレート6の両端部と中央部に径
差を設け、両端部を細くする事により、酸素の流れの抵
抗が小さくなり噴出斌が多くなる。径差を設ける部分の
長さ及び径差は熱鋼片の寸法・コーナーR等により決め
られる。 火口ユニット端部の酸素流量を増加させる方
法はバッフルプレートに径差を設ける方法の外に、専用
ユニットを設けることなく、同一火口ユニットの端部を
別の酸素系統にするなどの方法も可能である。Solvent oxygen is supplied from the manifold 4 to the head 5. It passes through the baffle plate 6 (for example, on the front side and the back side of the page) and is ejected from a small diameter nozzle arranged in a straight line on the orifice plate 7, but there is a diameter difference between both ends and the center of the baffle plate 6, By making it thinner, the resistance to the flow of oxygen becomes smaller and the number of blowouts increases. The length and diameter difference of the portion where the diameter difference is provided are determined by the dimensions of the hot steel piece, corner radius, etc. To increase the oxygen flow rate at the end of the crater unit, in addition to creating a diameter difference in the baffle plate, it is also possible to use a different oxygen system at the end of the same crater unit without installing a dedicated unit. be.
つぎに本発明を実施した場合と従来法での鋼片のグライ
ンダー手入能率の比較の1例を第1表に示す。第1表に
示す如く、本方案では角部溶剤残りを防止出来た事によ
り、手入能率は50.9%と著しく向上した。Next, Table 1 shows an example of a comparison of the grinder maintenance efficiency of steel slabs when the present invention is implemented and the conventional method. As shown in Table 1, this method significantly improved the cleaning efficiency to 50.9% due to the prevention of solvent residue at the corners.
第 1 表
但し 傘1 (C)=(A)−(B)峠(D)=(
C)/(B)x100%
また高炭素鋼線材の脱炭基準外れの発生率について本発
明を実施した場合と従来法との比較を第2表に示す。表
に示すごとく、本発明では角部溶剤残りを防fヒ出来た
事により、線材の部分脱炭による基準外れ発生率が減少
し、切り込み加工が不要となった。First Table However, Umbrella 1 (C) = (A) - (B) Pass (D) = (
C)/(B)x100% Furthermore, Table 2 shows a comparison between the case where the present invention is implemented and the conventional method regarding the incidence of deviation from the decarburization standard of high carbon steel wire rods. As shown in the table, in the present invention, since the residual solvent at the corners can be prevented from fraying, the incidence of deviation from the standard due to partial decarburization of the wire rod is reduced, and cutting is no longer necessary.
第 2 表
但し −1(C)=(A)−(ロ)
傘2 (D)= ((A)−(B)) /(A
)X100%[発明の効果]
本発明は以上の説明の如く次のような効果がある。Table 2 Provided that -1 (C) = (A) - (B) Umbrella 2 (D) = ((A) - (B)) / (A
)X100% [Effects of the Invention] As explained above, the present invention has the following effects.
(1)溶剤斌が辺と角部が同程度に均一化されることか
ら余分に溶剤盪を増加させる必要がなくなり歩留が向上
する。(1) Since the solvent droplet is made uniform to the same extent on the sides and corners, there is no need to increase the solvent droplet, and the yield is improved.
(2)鋼片角部のヘゲ疵やシーム疵が減少する事からグ
ラインダー手入能率が著しく向上する。(2) The grinder maintenance efficiency is significantly improved since the number of sludge defects and seam defects on the corners of the steel billet is reduced.
(3)高炭素鋼材においては脱炭不良による切込加工量
が減少する。(3) In high carbon steel materials, the amount of cutting due to poor decarburization is reduced.
(4)品質が安定する。(4) Quality is stable.
第1図は本発明を示す火l]ユニットの例の断面説明図
、第2図は従来法によるホットスカーフ前後の鋼材の断
面形状を示す図である。
■・・・熱鋼片、2・・・シュー、3・・・酸素ピスト
ン、4・・・マニホルド、5・・・ヘッド、6・・・バ
ッフルプレート、7・・・オリフィスプレー1へ、8・
・・溶剤Mf鋼材断面形状、9・・・溶剤後鋼材断面形
状、10・・・火口ユニット。
特許出願人 新日本製鐵株式会社
日本スピング株式会社FIG. 1 is a cross-sectional explanatory diagram of an example of a hot scarf unit showing the present invention, and FIG. 2 is a diagram showing the cross-sectional shape of a steel material before and after a hot scarf according to a conventional method. ■... Hot steel piece, 2... Shoe, 3... Oxygen piston, 4... Manifold, 5... Head, 6... Baffle plate, 7... To orifice spray 1, 8・
... Solvent Mf steel material cross-sectional shape, 9... Steel material cross-sectional shape after solvent, 10... Crater unit. Patent applicant Nippon Steel Corporation Nippon Sping Co., Ltd.
Claims (1)
、熱鋼片寸法に対応する火口ユニット端部の酸素流量を
増加させることによって熱鋼片角部の溶削残り防止を可
能とすることを特徴とする熱間溶削方法When a hot steel billet is entirely subjected to solvent treatment using a hot scarf machine, it is possible to prevent residual machining at the corners of the hot steel billet by increasing the oxygen flow rate at the end of the crater unit corresponding to the size of the hot steel billet. Hot cutting method
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP27541086A JPS63130268A (en) | 1986-11-20 | 1986-11-20 | Hot scarfing method |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP27541086A JPS63130268A (en) | 1986-11-20 | 1986-11-20 | Hot scarfing method |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS63130268A true JPS63130268A (en) | 1988-06-02 |
Family
ID=17555110
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP27541086A Pending JPS63130268A (en) | 1986-11-20 | 1986-11-20 | Hot scarfing method |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS63130268A (en) |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS4940265A (en) * | 1972-08-24 | 1974-04-15 |
-
1986
- 1986-11-20 JP JP27541086A patent/JPS63130268A/en active Pending
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS4940265A (en) * | 1972-08-24 | 1974-04-15 |
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