JPS62127186A - Bar junction device - Google Patents

Abstract

PURPOSE:To enable the junction of uniformity and high intensity by cutting off the oxidized scale on a hot working bar junction face by using a cutting device and by press-fitting with spraying an oxygen. CONSTITUTION:The cutting device 16 having a cutting blade 15 is provided behind a bar press-fitting device 1 and an oxygen gas feeding pipe 11 is fitted to an injection nozzle 10. In case of joining the preceding bar 7 and succeeding bar 5, the oxidized scale on the lower face of the junction face is cut off by inserting the cutting device 16 to the lower side of the preceding bar 7. Then, the press-fitting junction is performed by descending the upper metal die 3 with blowing off the oxidized scale as well as performing the heating melt by blowing an oxygen gas on the junction face via the feeding pipe 11. Consequently the junction part can be uniformized and intensified.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a device for hot joining the rear end of a leading bar and the tip of a trailing bar to each other.

[Prior Art] In conventional hot rolling equipment, each slab is rolled and the plate (sheet bar) is wound into a coil shape. In such conventional equipment, the rolling speed during bar biting and ash removal is slow, and there is a time lag between the completion of rolling of the preceding material and the start of rolling of the succeeding material, resulting in poor production efficiency and aging. There was a problem.

In order to solve the above-mentioned drawbacks of the equipment, a method has been proposed in which the trailing end of the preceding material and the leading end of the succeeding material are twisted together and crimped together using a press method.

[Problems to be Solved by the Invention] However, in the above method, since the overlapping portions of the bars are simply crimped, the oxidized surface may remain inside and the joint may not be successful, so welding work is required. There was a problem that the work became complicated.

In view of these circumstances, the present invention is designed to enable homogeneous and high-strength joining of the rear end of a preceding bar and the tip of a succeeding bar without welding.

[Means for solving the problems] The present invention attempts to solve the above technical problems, and
A device for hot joining a leading bar and a trailing bar includes a cutting device for scraping off the oxidized scale surface on one side of the bar joining surface, and a cutting device that sprays oxygen gas and, if necessary, iron powder on the other joining surface to dissolve it. The present invention relates to a bar joining device, characterized in that it is equipped with a jet nozzle having a diameter of 10 mm, and a crimping device for crimping and joining the joining surfaces.

[Function] Therefore, in the present invention, the oxide scale on one side of the joint surface of the hot bar is scraped off by a cutting device, and the other side of the joint surface is blown with oxygen 02 gas to oxidize and heat to melt and blow off the oxide scale. By crimping,
Bars can be joined together with high strength. Also, by spraying iron powder together with oxygen gas, it is possible to join stainless steel bars.

[Example] An embodiment of the present invention will be described below with reference to the drawings.

Reference numeral 1 in FIG. 1 is a bar crimping device, and the bar crimping device 1 includes an upper mold 3 for pressing that can be moved up and down by a fluid pressure cylinder 2, etc., and a lower mold 4 that is fixed so as not to go up and down.
Further, a rear support roller 6 is provided on the rear side of the bar crimping device 1 to guide the tip end of the trailing bar 5 onto the lower mold 4, and a leading bar is provided on the front side of the bar crimping device 1. 7
A front support roller 8 is provided which supports and moves up and down.

Further, on the rear side of the bar crimping device 1, there is provided an injection nozzle 10 which is raised and lowered by a fluid pressure cylinder 9 by 1q. The injection nozzle 10 is connected to an 02 (oxygen gas) supply pipe 11 and an iron powder supply pipe 12 that supplies iron powder using N2 gas as a carrier gas, and is supported by the rear support roller 6 and lowered. Trailing bar 5 located on mold 4
It has an 02 injection port 13 and an iron powder injection port 14 for injecting the 02 and iron powder toward the top surface of the tip.

In addition, a front support roller 8 is attached to the bar pressure bonding device 1.
A cutting device 16 is provided, which is supported upwardly by the upper mold 3 and is inserted under the rear end of the leading bar 7 located below the upper mold 3 to scrape off the lower surface of the rear end through a cutting blade 15. ing.

The upper mold 3 is raised, and the tip of the trailing bar 5 is located above the lower mold 4, the rear end of the leading bar 7 is located below the upper mold 3, and the distance between the bars 5 and 7 is increased. While supported by support rollers 6.8 to maintain the required spacing,
02 is injected and supplied to the upper surface of the tip of the bar 5 through the 02 supply pipe 11, the injection nozzle 10, and the 02 injection port 13.

By spraying the 02 gas, the tip of the hot high temperature bar (steel material) 5 is heated, for example, to around 1000°C and is partially melted, and the top surface of the tip of the bar 5 is heated by the injection of the Q2 gas. The oxide scale that has formed is blown away.

Subsequently, the injection nozzle 10 is raised by the fluid pressure cylinder 9, and at the same time, the cutting device 16 is inserted under the rear end of the leading bar 7 to scrape off the oxidized scale on the lower surface of the rear end.

In this state, by lowering the front support roller 8 and extending the fluid pressure cylinder 2 to lower the upper mold 3, the front and rear ends of the bar 5.7 are pressed together as shown in FIG.

Thereby, the joint portion can be joined uniformly and with high strength.

In addition, when joining stainless steel bars, it is not possible to expect a significant temperature increase due to oxidation just by spraying O2, so at the same time as spraying O2, the iron powder supply pipe 12, injection nozzle 10, and iron powder injection port 14 are Inject iron powder through the Then, the stainless steel bar can be heated by the oxidation of the iron powder by O2, so that it can be joined by pressure bonding.

It should be noted that the present invention is not limited to the above-mentioned embodiments, but it is also possible to join the bars by using a butt joining method, scraping off one of the joining surfaces with a cutting device, and spraying 02 on the other side to melt and join. Of course, various types of crimping devices and cutting devices for crimping the bars together can be used, and various changes can be made without departing from the gist of the invention.

[Effects of the Invention] As described above, according to the bar joining apparatus of the present invention, the oxidized scale on one of the joining surfaces of the hot bar is scraped off by a cutting device, and the oxidized scale is removed by spraying oxygen gas on the other joining surface. By avoiding heat melting and blowing off the oxide scale, the joint surfaces of the bars are crimped and joined together in this state, so the joint can be made homogeneous and joined with high strength.Furthermore, by spraying iron powder at the same time, It has an excellent effect of joining not only steel materials but also stainless steel bars.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing an example of an apparatus for carrying out the method of the present invention, and FIG. 2 is an explanatory diagram showing an example of a joined state of bars. 1 is a bar crimping device, 2 is a fluid pressure cylinder, 3 is an upper mold,
4 is a lower mold, 5 is a trailing bar, 6 is a rear support roller, 7 is a leading bar, 8 is a front support roller, 9 is a fluid pressure cylinder,
10 is an injection nozzle, 11 is an oxygen gas supply pipe, 12 is an iron powder supply pipe, 15 is a cutting blade, and 16 is a cutting device.

Claims (1)

[Claims] 1) In a device that hot joins a leading bar and a trailing bar, there is a cutting device that scrapes off the oxide scale surface on one side of the bar joint surface, and a cutting device that scrapes off the oxide scale surface on one side of the bar joint surface, and melts it by spraying oxygen gas and, if necessary, iron powder on the other joint surface. 1. A bar joining device comprising: an injection nozzle configured to press the joining surfaces together; and a crimping device for crimping and joining the joining surfaces.