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附錄 3
附錄3
美國5829117 號專利——熱鋸機鋸切式連續(xù)軋制方法及它的裝置
美國專利局發(fā)布于1998 年11 月3 日
有效期至2017 年1 月30 日
摘要
一種熱鋸鋸切與連續(xù)軋制方法使得可以連續(xù)同時鑄造兩根鋼坯，能用熱鋸機將鋼坯切成預(yù)定的長度，能通過一連接裝置直接提供由軋制線生產(chǎn)的鋼坯，能用以閃光對焊機不斷地將鋼坯焊接成一連續(xù)的鋼坯，能用磨床將鋼坯焊縫處的毛刺去除，用感應(yīng)加熱器將鋼坯加熱到一更高溫度后可以通過一軋機群連續(xù)軋制鋼坯。一種熱鋸鋸切與連續(xù)軋制的裝置可以提供以上所描述的加工方法。
專利權(quán)項
專利權(quán)項有：
1、一種熱鋸鋸切與連續(xù)軋制方法由以下幾步構(gòu)成：
連續(xù)同時鑄造連根鋼坯；
用熱鋸機將鋼坯切成預(yù)定長度；
通過一連接裝置提供由軋制線生產(chǎn)的鋼坯；
用以閃光對焊機不斷地將鋼坯焊成一連續(xù)的鋼坯；
用磨床將鋼坯焊縫處的毛刺去除；
用感應(yīng)加熱器將鋼坯加熱到更高溫度并通過一軋機群連續(xù)軋制鋼坯。
2、一種熱鋸鋸切與連續(xù)軋制裝置構(gòu)成如下：
一能同時鑄造兩根鋼坯的鑄造機器；
一安裝在鑄造線上的移動熱鋸機；
一連接裝置，安裝在鑄造線與軋制線直接，能交替?zhèn)魉蛷那懈钐帿@得的鋼坯部件；
一移動式閃光對焊機，安裝在連接裝置的出口，能將鋼坯部件不斷的焊成一連續(xù)的鋼坯；
一移動式磨床，安裝在移動式閃光對焊機的出口，能去除鋼坯焊縫處的毛刺；
一感應(yīng)加熱器，安裝在移動式磨床的出口，能將連續(xù)的鋼坯加熱到一更高溫度；
一軋機群組，用于軋制被加熱到上述更高溫度的鋼坯。
3、權(quán)項2 中的連接裝置構(gòu)成如下：
一鏈?zhǔn)絺魉蜋C，安裝在軋機線的一側(cè)，將鑄造線提供的鋼坯送到軋制線；
另一鏈?zhǔn)絺魉蜋C，安裝在軋制線的另一側(cè)，將另一條鑄造線的鋼坯傳送到軋制線。
4、一種熱鋸鋸切與連續(xù)軋制裝置構(gòu)成如下：
一能同時鑄造兩根鋼坯的鑄造機器；
一安裝在鑄造線上的移動熱鋸機；
一連接裝置，安裝在鑄造線與軋制線之間，能通過轉(zhuǎn)動到預(yù)定角度交替?zhèn)魉蛷那懈钐帿@得的鋼坯部件；
一移動式閃光對焊機，安裝在連接裝置的出口，能將鋼坯部件不斷地焊成一連續(xù)的鋼坯；
一移動式磨床，安裝在移動式閃光對焊機的出口，能去除鋼坯焊縫處的毛刺；
一感應(yīng)加熱器，安裝在移動式磨床的出口，能將連續(xù)的鋼坯加熱到一更高溫度；
一軋機群組，用于軋制被加熱到上述更高溫度的鋼坯。
5、權(quán)項4 中的連接裝置構(gòu)成如下：
一能往復(fù)運動到一預(yù)定角度的轉(zhuǎn)盤，可以將鋼坯部件由一轉(zhuǎn)盤傳送到另一轉(zhuǎn)盤的回轉(zhuǎn)中心線上。
綜述
發(fā)明的背景
1、發(fā)明的領(lǐng)域
本發(fā)明是關(guān)于一種連續(xù)的軋制方法，軋制的鋼坯由一連續(xù)的鑄造機提供。尤其重要的是，本發(fā)明是關(guān)于一種連續(xù)的軋制方法和裝置。在這種裝置中，可以直接提供兩根鋼坯并由熱鋸機鋸切。鋸切的鋼坯用閃光對焊機焊接在一起，并磨削去毛刺。之后生成的鋼坯被感應(yīng)加熱到更高溫度后進行軋制。
2、涉及的技術(shù)
鋼坯連軋法是一種有效的節(jié)能軋制方法。它可以生產(chǎn)盤條、鋼棒和型鋼。例如，日本未經(jīng)審查的專利出版物第52-43754 號提出的鋼坯連軋法中，鋼坯由一連續(xù)鑄造機提供，而后鋼坯被熱鋸機切成預(yù)定長度，切斷后經(jīng)暫時冷卻鋼坯部件被加熱爐重新加熱，然后被重新加熱的鋼坯部件用閃光對焊機焊接在一起，毛刺被鋼坯燒剝器上的成型刀具去除。之后連續(xù)的鋼坯被感應(yīng)加熱器加熱到軋制所需的溫度從而使得加熱的連續(xù)的鋼坯由軋機群組軋制。
然而在這種常規(guī)的連軋法中，鋼坯必須由室溫20℃加熱到1000℃左右，以達到軋制所需的最終溫度1020℃。因此增加了很多加熱的成本。另外，連續(xù)鑄造能力和連續(xù)軋制能力的不同阻礙了鋼坯鑄造線和軋制線的直接連接。這就不可避免的導(dǎo)致了需使用巨大的設(shè)備并占用很大的空間。更重要的是，成型刀具被用來去除鋼坯閃光對焊部分的毛刺。這就使得當(dāng)鋼坯被焊接好后成型刀具的壽命短而不能連續(xù)的工作。從而使得在這個例子中難以完成去除毛刺的工作。
這項發(fā)明的摘要
這項發(fā)明的目的是解決上述的問題并提供一種連續(xù)軋制的方法和它的裝置。從而使得進一步節(jié)約能源和空間并獲得更高的效率成為可能。
這項發(fā)明的熱鋸連軋法由以下幾步構(gòu)成：連續(xù)地鑄造兩根鋼坯；用熱鋸機將鋼坯鋸成預(yù)定長度；通過連接裝置將鋸切的鋼坯直接傳送到軋制線；用閃光對焊機連續(xù)地焊接鋼坯部件；用磨床磨削去除焊接鋼坯的毛刺；用感應(yīng)加熱器將連續(xù)的鋼坯加熱到更高溫度；通過軋機群組連續(xù)地軋制鋼坯。
首先，熱鋸連軋裝置包括：一能連續(xù)同時鑄造兩根鋼坯的鑄造機；安裝在各自鑄造線上的移動式熱鋸機；安裝在鑄造線與軋制線之間的連接裝置，它能交替?zhèn)魉弯徢刑幍匿撆?；安裝在傳送裝置出口的移動式閃光對焊機，它能將鋼坯部件不斷地焊成連續(xù)的鋼坯；安裝在移動式閃光對焊機出口的移動式磨床，它能去除連續(xù)鋼坯焊縫處的毛刺；安裝在移動式磨床出口處的感應(yīng)加熱器，它能將連續(xù)的鋼坯加熱到一更高溫度；一軋機群組，它能軋制被加熱到上述更高溫度的連續(xù)鋼坯。
其次，熱鋸連軋裝置包括：一能連續(xù)同時鑄造兩根鋼坯的鑄造機；安裝在各自鑄造線上的移動式熱鋸機；安裝在鑄造線與軋制線之間的連接裝置，它能轉(zhuǎn)到預(yù)定角度從而可交替?zhèn)魉弯徢械匿撆?；安裝在傳送裝置出口的移動式閃光對焊機，它能將鋼坯部件不斷地焊成連續(xù)的鋼坯；安裝在移動式閃光對焊機出口的移動式磨床，它能去除連續(xù)鋼坯焊縫處的毛刺；安裝在移動式磨床出口處的感應(yīng)加熱器，它能將連續(xù)的鋼坯加熱到一更高溫度；一軋機群組，它能軋制被加熱到上述更高溫度的連續(xù)鋼坯。
通過本發(fā)明，鋼坯鑄造線和軋制線被一連接裝置間歇的連接在一起，從而消除了使用加熱爐的需要。而加熱爐在常規(guī)方法中很常見。這就使得加熱得到有效利用。因為感應(yīng)加熱器只需將鋼坯從100℃加熱到920℃以及在鑄造機輸出端將鋼坯加熱到軋制溫度1020℃,因此加熱成本得到很大幅度的減少。因為當(dāng)連鑄線只有一條時很難平衡連鑄能力和連軋能力，因此將連鑄線數(shù)目提高到兩根。將兩條連鑄線和一條連軋線通過一傳送裝置連接在一起時一種有效地方式，它平衡了連鑄能力和連軋能力。另外，當(dāng)連鑄線有3根或更多時，一干擾鑄造線上的熱鋸機的熱鋸機就不能放置了。
另外，因為熱鋸機的使用，使得切斷面平整有規(guī)則，從而減少了閃光對
焊機的焊接時間。
磨床被用來去除焊縫處的毛刺，從而使得刀具壽命長，即使形成的一個
步驟是在焊接部分也能完成去除毛刺的工作。
綜上所述，鋼坯鑄造線和軋制線由一連接裝置間歇的連接在一起，從而避免了加熱爐的使用，進而有效的節(jié)約了能源和降低了加熱成本。另外，由于兩條鑄造線的使用，連接裝置得以有效平衡了連鑄能力和連軋能力。這使得與常規(guī)設(shè)備相比節(jié)約了空間。再次，由于減少了閃光對焊的時間，從而延長了磨床的壽命，滿足了連軋的要求。
US Patent 5829117 - Hot saw cutting typecontinuous rolling method and apparatus thereof
US Patent Issued on November 3, 1998
Estimated Patent Expiration Date: January 30, 2017
Abstract
A hot saw cutting type continuous rolling method comprises casting two strand billets continuously; cutting the billets to predetermined length by hot saws; directly feeding billet portions obtained by cutting onto a rolling line via a line connecting device; continuously welding and joining the billets portions by a flash butt welder to form a continuous billet; grinding and removing burrs at the welded portion of the continuous billet by a grinding machine; and continuously rolling the billet by a rolling mill group, after heating the continuous billet to a higher temperature by an induction heater. A hot saw cutting type continuous rolling apparatus is provided for performing the above-described method.
Claims
What is claimed is:
1. A hot saw cutting type continuous rolling method comprising the steps of: casting two strand billets continously; cutting the billets to predetermined length by hot saws; directly feeding billet portions obtained by cutting to a billet rolling line through means of a line connecting device; continously welding and joining the billets portions by a flash butt welder to form a continuous billet; grinding and removing burrs at the welded billet portion by a grinding machine; heating the continuous billet to a higher temperature by an induction heater; and continuously rolling the billet by a rolling mill group.
2. A hot saw cutting type continuous rolling apparatus comprising:
a continuous casting machine for casting two strand billets; traveling-type hot saws disposed on their respective casting lines; a line connecting device including means for alternately performing transverse feeding of billet portions obtained by cutting, disposed between the casting lines and a rolling line; a traveling-type flash butt welder for continuously welding and joining the billet portions to form a continuous billet, disposed at a downstream side of the line connecting device; a traveling-type grinding machine for removing burrs at the welded portion of the continuous billet, disposed at a downstream side of the traveling-type flash butt welder; an induction heater for heating the continuous billet to a higher temperature, disposed at a downstream side of the traveling-type grinding machine; and a rolling mill group for rolling the continuous billet which was heated to said higher temperature.
3. The apparatus of claim 2, wherein the line connecting device comprises:
a first chain conveyor disposed at one side of the rolling line, transversely feeding the billet on one casting line onto the rolling line; and a second chain conveyor disposed at another side of the rolling line, transversely feeding the billet on another casting line onto the rolling line.
4. A hot saw cutting type continuous rolling apparatus comprising:
a continuous casting machine for casting two strand billets; traveling-type hot saws disposed on their respective casting lines; a line connecting device including means which rotates by a predetermined angle for alternately performing transverse feeding of billet portions obtained by cutting, disposed between the casting lines and a rolling line; a traveling-type flash butt welder for continuously welding and joining the billet portions to form a continuous billet, disposed at a downstream side of the line connecting device; a traveling-type grinding machine for removing burrs at the welded portion of the continuous billet, disposed at a downstream side of the traveling-type flash butt welder; an induction heater for heating the continuous billet to a higher temperature, disposed at a downstream side of the traveling-type grinding machine; and
a rolling mill group for rolling the continuous billet which was heated to said higher temperature.
5. The apparatus of claim 4, wherein the line connecting device comprises:
a turntable which reciprocately rotates by a predetermined angle; and means for transversely pushing the billet portion on the turntable onto a centerline of rotation of the turntable.
Description
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a continuous rolling method of a billet directly fed from a continuous casting machine, and, more particularly, to a continuous rolling method and apparatus in which after two billet strands have been directly fed and cut by a hot saw, the billet portions obtained by cutting are welded together by flash butt welding, followed by burr grinding, after which the resulting billet is heated to a higher temperature by induction heating to roll the billet.
2. Description of the Related Art
The billet continuous rolling method is known as an energy-saving rolling method for efficiently producing a wire rod, steel bar, or shaped steel. For example, in the billet continuous rolling method disclosed in Japanese Unexamined Patent Publication No. 52-43754, a billet, directly fed from a continuous casting machine, is cut into a predetermined length by a hot saw, followed by temporary cooling of the billet portions obtained by cutting to reheat the cooled billet portions in a heating furnace. Then, the reheated billet portions are welded together by a flash butt welder, after which the burr on welded portion is peeled off by a forming tool disposed on a scarfer. Thereafter, the continuous billet is heated to the required temperature for rolling by an induction heater to roll the heated continuous billet by a group of rolling mill.
However, in such a conventional continuous rolling method, the billet must be heated by about 1000° C., from room temperature of 20° C. to a final rolling required temperature of 1020° C, thereby considerably increasing heating costs. In addition, a difference between the continuous casting capacity and the rolling capacity prevents direct connection of a billet casting line and a billet rolling line,which inevitably results in huge facilities and makes it necessary to use a large space. Further, a forming tool is used for removing burrs from the billet flash butt welded portion, so that the forming tool has a short tool life and continuous operation cannot be performed, when a step is formed at the billet welded portion, since it is difficult to perform burr removal in such a case.
SUMMARY OF THE INVENTION
The present invention aims to solve the above-described problem and to provide continous rolling method and apparatus thereof to make it possible to further save energy and space, and achieve higher efficiency.
A hot saw cutting type continuous rolling method of the present invention comprises the steps of casting two strand billets continously; cutting the billets to predetermined length by a hot saw; directly feeding billet portions obtained by cutting to a billet rolling line through means of a line connecting device; continously welding and joining the billets portions by a flash butt welder; grinding and removing burrs at the welded billet portion by a grinding machine; heating the continuous billet to a higher temperature by an induction heater; and continuously rolling the billet by a rolling mill group.
Firstly, a hot saw cutting type continuous rolling apparatus comprises: a continuous casting machine for casting two strand billets; traveling-type hot saws disposed on their respective casting lines; a line connecting device including means for alternately performing transverse feeding of the billet portions obtained by cutting, disposed between the casting lines and a rolling line; a traveling-type flash butt welder for continously welding and joining the billet portions to form a continuous billet, disposed at a downstream side of the line connecting device; a traveling-type grinding machine for removing burrs at the welded portion of the continous billet, disposed at a downstream side of the traveling-type flash butt welder; an induction heater for heating the continous billet to higher temperature, disposed at a downstream side of the traveling-type grinding machine; and a rolling mill group for rolling the continous billet which was heated to said higher temperature.
Secondly, a hot saw cutting type continuous rolling apparatus comprises: a continuous casting machine for casting two strand billets; traveling-type hot saws disposed on their respective casting lines; a line connecting device including means which rotates by a predetermined angle for alternately performing transverse feeding of billet portions by cutting, disposed between the casting lines and a rolling line; a traveling-type flash butt welder for continously welding and joining the billet portions to form a continuous billet, disposed at a downstream side of the line connecting device; a traveling-type grinding machine for removing burrs at the welded portion of the continous billet, disposed at a downstream side of the traveling-type flash butt welder; an induction heater for heating the continous billet to a higher temperature, disposed at a downstream side of the traveling-type grinding machine; and a rolling mill group for rolling the continous billet which was heated to said higher temperature.
According to the present invention, a billet casting line and a rolling line are intermittently connected together by a line connecting device, thereby eliminating the need for a heating furnace, as has been conventionally the case, and allowing effective use of the heat of the billets. Therefore, heating costs are greatly reduced, since the induction heater needs to heat the billets by only about 100° C. from about 920° C. at the output side of the continuous casting machine to about 1020° C. rolling temperature.
Two billet strands are subjected to continuous casting, since when only one strand is subjected to continuous casting, it becomes difficult to balance the continuous casting capacity and the continuous rolling capacity. The continuous casting capacity and the continuous rolling capacity are balanced in an efficient manner by connecting the two strand casting lines and the one strand rolling line by a line connecting device interposed therebetween. On the other hand, when three or more strands are to be subjected to continuous casting, a hot saw, which interferes with another hot saw on the casting line, cannot be placed.
In addition, since a hot saw is used for cutting operations, the cutting face is cut at right angles and has no irregularities, thereby reducing the welding time of the flash butt welder.
A grinding machine is used for grinding the burrs at the welded portion, so that the tool life thereof is long, and burr removal is possible, even when a step is formed at the welded portion, since a relatively deep grinding operation can be performed.
As described above, the billet casting lines and the billet rolling line are intermittently connected by a line connecting device, thereby eliminating the need for a billet heating furnace, so that energy is effectively saved and heating costs are greatly reduced. In addition, since two strands of billets are directly fed, the line connecting device allows the continuous casting capacity and the rolling capacity to be efficiently balanced. It is possible to save space compared to conventional facilities. Further, the flash butt welding time is reduced, thereby prolonging the life of the grinding machine, and satisfactorily allowing continuous rolling.