JPS63126636A - Chain ring welding method - Google Patents

Abstract

PURPOSE:To eliminate the burn through an movement of a welding metal and to perform a sure welding by placing the butt end part of a chain ring on a base, welding it in the vertical wall forming an adequate gap and simultaneously pressing it by pushing it in opposition. CONSTITUTION:A stationary vertical wall 3 and mobile vertical wall 4 are provided by forming an adequate gap at both sides of the butt end B of the chain ring A placed on a base 1, and pressing bodies 5, 6 are abutted to the bent part C at both ends of the chain ring. TIG welding is performed by the nozzle 7 for welding arranged at the upper part for the butt end B. The welding is completed by increasing the pressing pressure by the pressing bodies 5, 6 for the chain ring both ends bent part C simultaneously with the melt of the butt end B. With this method, the cain with Al, etc., as the blank can be produced with high efficiency.

Description

Detailed Description of the Invention (Industrial Application Field) This invention relates to a method for joining butt ends of chain rings constituting a chain in a chain manufacturing process, particularly chain rings made of aluminum or its alloy. Regarding.

(Prior art) The butt ends of the chain rings constituting the chain are generally joined by electric resistance welding such as upset butt welding, which applies pressure using Joule heat generated by passing an electric current through the butt ends of the chain rings. has been adopted.

(Problem to be solved by the invention) However, if the material of the chain is made of aluminum or its alloy, which is soft and has a low melting temperature and is difficult to weld, it is extremely difficult to weld. For practical reasons, it is not possible to weld chains made of general steel using the electric resistance welding method, which is applied to chains made of ordinary steel.

The present invention has been made in view of the above points, and provides a chain welding method that achieves reasonably appropriate and reliable welding of chains made of aluminum or its alloys, etc. The purpose is to

(Means for Solving the Problems) The gist of the present invention for achieving the above-mentioned object is to:
A chain chain welding method characterized in that standing walls are provided with appropriate gaps on both sides of the abutting ends, and the abutting ends are welded from above while welding is carried out by pressing and pressurizing the chain chain oppositely from bent portions at both ends. It is in.

(Function) According to the present invention, the abutting ends of the chain to be welded are placed on a table, and TIG welding is performed in a vertical wall with an appropriate gap formed on both sides of the abutting ends. Since the molten metal is pressed and pressurized in opposite directions, there is no dripping or movement of the molten metal during welding, achieving reliable welding.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings.

Fig. 1 is a plan view of a chain ring placed on a table and held by a pressing body, Fig. 2 is a side view of the main part, Fig. 3 (a), (bl
, (C) are welding procedure explanatory diagrams.

The chain to which this invention is applied is made of a light metal such as aluminum or an alloy thereof, and the chain ring angles connected as a chain are formed by a known method.

In the figure, 1 is a table on which the chain ring A to be welded is placed, and a guide groove 2 is provided on the table surface, and on the table 1, every other chain ring angle is guided/the lower half of it is inserted into #2. The welding is divided into two parts, one that stands up and the other that lies down, and moves in an orderly manner, and at the processing position set on the table 1, welding is performed on the chain ring angle that is in the prone state.

3.4 is a fixed standing wall and a movable standing wall that are provided with an appropriate gap on both sides of the abutting end B to the chain ring placed on the table 1 at the processing position, the fixed standing wall 3 is fixed to the table surface, and the movable standing wall 4 is fixed to the table surface. is configured to move back and forth from the side with respect to the platform.

5.6 is a pair of pushers that hold the chain ring A in a fixed position by contacting the bent portions C at both ends of the chain ring at the processing position on the table 1, and are placed on standby at a distance to the side of the table 1. It moves forward and backward from the position to the machining position on the table 1, and at the machining position on the table 1, it moves toward and away from the chain and comes into contact with the bent portions C at both ends of the chain, and one of the pressers 5 is placed on the table 1. The pressing member 1 only moves forward and backward between the processing position and the standby position, and the other pusher 6 moves forward and backward between the processing position and the standby position, and moves toward and away from the pusher 5. The above-mentioned movable standing wall 4 is disposed on the pressing body 5 and moves integrally therewith.

Reference numeral 7 denotes a TIG welding nozzle that is disposed facing downward above the processing position of the table 1.

In the figure, reference numeral 8 denotes a guide member for the movable standing wall 4 provided on the stand 1, which guides the movable standing wall 4 to move over the straight portion of the chain ring ^ by moving forward and backward.

In the above configuration, when the movable vertical wall 4 and the pressing bodies 5 and 6 are in the standby position, and the chain ring A to be welded reaches the processing position on the table 1 and stops, the movable vertical wall 4 and the pressing bodies 5 and 6 With the forward movement, the pressing bodies 5 and 6 face the bent portions C on both sides of the chain ring, and a gap is formed between the movable vertical wall 4 and the abutting end B of the chain ring A.

Continuing from this state, the pushers 5 and 6 approach each other, and the pushers 5 and 6 come into contact with the bent portions C at both ends of the chain ring, thereby holding the chain angle at a fixed position. Thereafter, TIG welding is performed on the abutting end B of the chain ring A using the welding nozzle 7 disposed above the abutting end B, and at the same time as the abutting end B is melted, the pressing body 5° is pressed against the bent portion C at both ends of the chain ring. Welding is completed by increasing the pressing pressure in Step 6.

Thereafter, based on the reverse order of the above operations, the movable standing wall 4 and the pushers 5, 6 return to the standby position, and the subsequent chain ring angle to be welded moves to the processing position on the table 1.

(Effects) As described above, this invention attempts to weld chain rings made of aluminum or its alloy by TiG welding, and the abutting ends of the chain rings to be welded are placed on a table and the welded rings are welded. The butt ends are provided with standing walls with appropriate gaps on both sides, and since welding is performed within these walls, the heat during welding is concentrated on the butt ends, causing instantaneous melting. Welding can be completed within a very short period of time when the metal is surrounded by the table and the standing walls on both sides and is dispersed, making it easy to weld chains made of materials such as aluminum that require severe welding conditions. This enables highly efficient production and reduced production costs.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a plan view of a chain ring placed on a table and held by a pressing member, FIG. 2 is a side view of the main part, and FIG. ). (b) and [0] are welding procedure explanatory diagrams. ■...stand, 2...guide groove, 3.4...standing wall, 5.
6... Pushing body, 7... Welding nozzle, 8... Guide member, 8... Chain ring, B... Butt end, C... Chain ring both ends bent parts. :"r="A4'small----1-I

Claims (2)

[Claims] (1) Place the butting ends of the chain rings to be welded on a table, and on the table, create a standing wall with an appropriate gap on both sides of the butt ends,
A chain chain welding method characterized in that the abutting ends are welded from above, and the chain joints are joined by pressing and pressing oppositely from the bent portions of both ends of the chain. (2) Claim 1, wherein the welding is TIG welding
Chain ring welding method described in section.