JPS61176484A - Joining method of metallic plate - Google Patents

Abstract

PURPOSE:To join solidly an end face with the melting of a spinning plug and both end faces by friction and removal of scales on the end face by performing a butt pressing of both end faces with rotating at high speed by pinching plural spinning plugs between the end faces of both metallic plates. CONSTITUTION:The end part of rolled stocks 1, 2 is cut by shear and both end faces 1a, 2a are made vertical and in such shape as the both being coincided in case of abutting each other. Both end faces 1a, 2a are then approached and plural spinning plugs 3 are arranged at about equal intervals in the longitudinal direction of both end faces 1a, 2a between them. Both rolled stocks 1, 2 are then pressed in the approaching direction so as to pinch the spinning plug 3 by approaching both end faces 1a, 2a further with rotating at high speed by a driving device 4 the spinning plug 3. A friction heat is caused on the contact surface of the spinning plug 3 and rolled stocks 1, 2. Both end faces 1a, 2a are partially melted by the heat thereof. The melt spreads gradually. The spinning plug 3 is melted and miniaturized as well. Now when both rolled stocks 1, 2 are pressed in the approaching direction further both rolled stocks are firmly joined.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of butting and press-welding the end surfaces of two metal plates to each other, for example in the field of hot rolling. The present invention relates to a method of joining the tip of a rolled material to make it continuous.

[Prior art j] In hot rolling, when the rear end of a preceding rolled material and the leading end of a subsequent rolled material are butt-pressed and joined, oxide scale is attached to the surface of the rolled material. There is a problem in that it is difficult to obtain the required bonding strength. Therefore, conventionally, before abutting, the abutting surfaces are descaled in advance using a scale removing device, and then the abutting surfaces are abutted and pressure welded.

[Problems to be Solved by the Invention] However, in the case of the above method, it is actually quite difficult to butt the parts within a short time after descaling, so oxide scale grows on the butt surfaces again and reduces the bonding strength. There is a problem of lowering the value.

An object of the present invention is to perform descaling and butting almost simultaneously to improve bonding strength.

[Means for Solving the Problems] In order to solve the above problems, the present invention provides a plurality of spindles arranged in the length direction of the end faces between the end faces of the metal plates to be joined, that is, the rolled material in the above example. The spin plug is sandwiched between spin plugs, and these spin plugs are rotated at high speed, so that the two end surfaces are brought into contact with each other by pressure.

[Operation] In the method of the present invention, by rotating the spin plug at high speed, frictional heat is generated at the contact surface between the spin plug and the rolled material. The heat and the rotational force of the spin plug melt and remove the oxide scale attached to the end face of the rolled material. Thereafter, the end surfaces of the inter-rolled materials are brought into pressure contact with each other, so that the melted surfaces are combined and a strong joint is achieved.

1 Embodiment] An embodiment of the present invention will be described below with reference to FIGS. 1 to 4.

This example is an example of joining hot rolled materials,
In the figure, 1 is a leading rolled material, and 2 is a trailing rolled material, both of which are on the hot rolling line.

In this joining method, first, the ends of the inter-rolled materials I and 2 to be joined are cut with a crop shear, and the end surfaces 1a and 2a are perpendicular to the upper and lower plate surfaces, and the end surfaces 1a and 2a are butted against each other. Create a shape that will match the two when stretched. Then,
As shown in FIG. 1, the end of the inter-rolled material 1.2 is
, 2a are brought close to each other so that they face each other. At the same time, a plurality of spin plugs 3 are arranged at equal intervals in the length direction of the end surfaces 1a, 2a between the end surfaces 1a, 2a to be matched. The spin plug 3 is a cylindrical body made of the same material as the rolled materials 1 and 2, has a length equivalent to the thickness of the rolled materials, and is disposed with its axis facing up and down. The sleeve 4ah of the rotary drive device 4 is fitted into the square hole 3a formed on the upper end surface of the spin plug 3. In addition, as a method for bringing them closer together, when carrying out this joining method during running, a method can be adopted in which the trailing rolled material 2 is sent faster than the preceding rolling material I.

Next, while rotating the spin plug 3 at high speed in the above state, the both end surfaces 1a and 2a of the rolled materials 1 and 2 are brought closer to each other so that the spin plug 3 is sandwiched between them, and the two are moved in the direction of the arrows A and H.
Apply force in the direction of . Then, as shown in FIG. 2, frictional heat corresponding to the pressing force is generated on the contact surface P between the rotating spin plug 3 and the rolled materials 1 and 2, and the heat partially causes the end surfaces 1a and 2a of the rolled materials to (The melted part is indicated by diagonal lines in the figure.) Initially, only the contact surface P is partially melted, but the heat is gradually transmitted to the surrounding area, the surrounding metal is also melted, and the molten zone expands.

Then, when the melting progresses further and the spin plug 3 itself melts and becomes smaller in diameter, further pressing causes the end surfaces 1a and 2a to come into contact and bond the molten metal, joining the inter-rolled materials I and 2. will be done. In this case, the spin plug 3 remains as a core, but since it is made of the same material as the rolled material 1.2, it gradually disappears during the next rolling process.

In addition, in this bonding method, by narrowing the arrangement interval of the spin plugs 3, the molten zone can be made wider, so that the bonding strength can be further increased.

Further, in the above embodiment, a spin plug made of the same material as the rolled material is used, but this does not necessarily have to be the case.

Further, in the above embodiments, the case of joining hot-rolled materials was taken as an example, but the present invention can be applied not only to the case of joining cold-rolled materials but also to the case of joining various metal plates.

Further, the spin plug rotation drive device in the above embodiment may be provided for each spin plug, but all spin plugs may be driven by one drive device.

[Effects of the Invention] According to the present invention, by rotating the spin plug at high speed, frictional heat is generated at the contact surface between the spin plug and the rolled material, the end face of the rolled material is melted by the heat, and the heat and the spin The rotational force of the plug melts and eliminates the oxidized scale on the same end face. At the same time, the end surfaces of the inter-rolled materials are pressed into contact with each other, so that the molten surfaces are combined and a strong joint is achieved.

[Brief explanation of the drawing]

The drawings are for explaining one embodiment of the present invention.
Figures (a) and (b) are a side view and a plan view, respectively, showing the state in which the spin plug is sandwiched between the end faces of the rolled material, and Figures 2 to 4 are plan views showing the press-welding process in order, respectively. It is a diagram. ■... Leading rolled material, 2... Trailing rolled material,
la. 2a... End faces to be matched, 3... Spin plug, 4... Rotation drive device. Figure 1 (Q) (b)

Claims (1)

[Claims] In a metal plate joining method in which the end surfaces of two metal plates are butted and pressure welded, a plurality of spin plugs are inserted between the end surfaces of both metal plates in the length direction of the end surfaces, and these spin plugs are rotated at high speed. A method for joining metal plates, characterized in that the two end surfaces are brought into butt and press contact.