JPS63126637A - Removal of welding node of chain ring - Google Patents

Abstract

PURPOSE:To finely cut a welding node and to shape it by finishing it in round and smooth face by holding a chain ring by fitting it to a holding base, holding a welding node part side by fitting it into a part of block body recessed grooves and turning the welding node part inside the recessed groove by rocking. CONSTITUTION:The straight part of a chain ring A is held by fitting it to the work position of a holding base 3, a pair of block bodies 5 are advanced and the welding node B of the chain ring A and its both side parts are held by fitting them into the recessed groove of the block body 5. At this time, one part of the welding node B is squeezed and a cut is pinched in a burr shape between the recessed grooves 16. The welding node B is rotated inside the recessed groove 6 by rocking the holding base 3 in this state. A burr like cut chip is thus peeled off, the welding node B part crushed inside the recessed groove 6 is simultaneously slided under storing pressure on the inner face of the recessed groove 6, and the whole periphery of the welding node B part is finished in a round smooth face. This method may be applied advantageously for the chain of Al (alloy), etc.

Description

[Detailed Description of the Invention] (Industrial Application Field) This invention relates to a method for shaping the ends of a chain ring wire constituting a chain by cold removing the weld joints produced by butt welding in the chain manufacturing process. .

(Prior art) Chain rings made from relatively large wire rods used for general industrial purposes are completely joined by butt welding at the ends of the wire rods. This results in welded joints.

In order to remove this weld joint by cold working, the present inventor holds one of the chain rings constituting the chain at a predetermined processing position, and uses a pair of block bodies that move the weld joint part toward and away from both sides. A method has been used in which the blocks are fitted into and held in a groove provided on the joint surfaces of the blocks, and then formed in the groove by relative translation of both blocks in this held state, and then removed with a knife.

(Problem to be Solved by the Invention) However, as described above, the chain ring to be processed is placed in a fixed state, the welded joint is inserted into the groove on the joint surface of the pair of block bodies, and the chain is held in this state. The method of moving a concave groove on the surface of the ring wire and cutting the weld joint with a knife is effective when the chain ring wire is made of iron such as mild steel, but it is effective when the chain ring wire is made of iron material such as aluminum or its alloy. In the case of soft metals, there are problems in that the chain wire rod bends during cutting with a knife, and it is difficult to finish the welded part with a uniformly round and smooth surface.

This invention has been made in view of the above points, and is particularly applicable when the chain wire material is made of soft metal such as aluminum or its alloy. It is an object of the present invention to provide a method for shaping a welded part of a chain by shaping it to a smooth surface.

(Means for Solving the Problems) The gist of the present invention to achieve the above object is to cut one of the chain rings constituting the chain by cutting the straight part of the chain without welding joints at the processing position. The welded joints of the chain ring are fitted and held in the grooves provided in the joint surfaces of the pair of blocks that move toward and away from both sides of the chain ring, and then the chain ring side of the holding stand is fitted and held. The present invention provides a method for shaping a welded part of a chain ring constituting a chain, characterized in that the welded joint part is rotated and shaped into a concave groove by swinging in a direction.

(Function) According to the present invention, the welded joints of the chain ring are fitted into and held in the grooves provided on the joint surfaces of the pair of block bodies that move toward and away from both sides of the chain ring. At the same time, a part of the weld joint is cut and the chips are caught in the concave groove, and then a part of the weld joint is crushed in the concave groove, and then the weld joint is recessed by swinging the holder that holds the chain ring. When rotated into the groove, the flaky cutting debris caught between the concave groove joint surface of the block body is peeled off from the chain ring wire surface, and the entire circumference of the welded part is finished with a round and smooth surface by sliding in the concave groove. .

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

Reference numeral 1 denotes a chain guide stand, which is formed into a mountain shape when viewed from the side, and has a series of guide grooves 2 for the chain extending from its top to the left and right inclined surfaces. Every other ring A stands up by fitting its lower half into the guide groove 2, and the remaining chain rings A lie down on the guide groove 2 and move intermittently in an orderly manner.

Reference numeral 3 denotes a holding stand that is incorporated into the guide stand 1 and holds one of the chain rings A standing up at the top of the guide stand in the processing position, and is connected to a swinging mechanism (not shown) so that its upper end guides around the shaft 4. The table swings in a predetermined range toward the side.

Reference numeral 5 denotes a pair of block bodies above the holding table 3, which move toward and away from each other from both sides of the holding table 3 toward the chain ring angle held by the holding table 3. 3
A concave groove 6 is provided to fit and hold the upper line portion of the chain ring A having the weld joint B which is held upright in the upper processing position, and both block bodies 5 are inserted between the operating section 7 extending above the groove 6. It opens and closes around a shaft 9 by a cam 8 that moves in and out and a spring (not shown).

In the figure, reference numeral 10 denotes a securing mechanism that holds the block body 5 under pressure.

In the above configuration, when a pair of block bodies 5 are separated and one chain ring angle is held at the processing position on the holding table 3, the block bodies 5 move forward toward this chain ring angle and join together.

Here, the weld joint B to the chain ring and the straight wire portions on both sides thereof are fitted and held in the groove 6 of the joint surface of the block body 5. At this time, a part of the weld joint B is cut by the leading edge of the groove 6, and at the same time, a part of the weld joint B is crushed inside the groove 6, and both grooves 6
Cutting debris is sandwiched between the joint surfaces in the form of flakes.

Next, the holding table 3 swings while maintaining this state.

At this time, the welding node B rotates within the groove 6, peeling off the flaky cutting chips that are caught in the joint surface of the groove 6 from the chain ring wire surface, and at the same time crushing them inside the groove 6. The welded joint 8 portion slides under strong pressure on the inner surface of the groove 6, making the entire circumference of the welded joint round and smooth.

(Effects) As described above, according to the present invention, the welded joints of the chain rings constituting the chain are fitted and held in the grooves of the pair of block bodies, so that the straight parts on both sides of the welded joints are held in the grooves of the pair of block bodies. Along with cutting the part,
A part of the weld joint is crushed in the concave groove, and then, in this state, the chain ring is swung toward the side of the chain ring, causing the weld joint crushed in the concave groove to be rotated. The part has a round and uniformly smooth finish all around the circumference, and each chain ring is evenly shaped, increasing the product value. Also, the time required to remove weld joints is extremely short and can be done efficiently. Furthermore, during the removal and shaping of weld joints, there is no locally biased unreasonable force applied, and there is no deformation of the chain ring or local strength loss, especially for chains made of light metals such as aluminum and its alloys. It is extremely suitable for application to

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a front view of a chain ring placed on a holding stand and held by a block body, FIG. 2 is a side view of the same, and FIG. 3(a). (bl, (C
1 is an explanatory diagram of the shaping process. 1... Guide stand, 2... Guide groove, 3... Holding stand, 4
...Shaft, 5...Block body, 6...Concave groove, 7...
・Operation unit, 8...cam, 9...shaft, 10...lashing mechanism. Two openings 3 Diagram 1 Diagram 2

Claims (1)

[Claims] A pair of blocks that hold one of the chain rings constituting the chain by fitting the linear part of the chain ring without a weld joint into a holding table at the processing position, and moving the weld joint part of the chain ring toward and away from both sides of the chain ring. It is characterized in that it is fitted into and held in a groove provided on the joint surface of the body, and then the welded joint is rotated into the groove by swinging the holding base toward the side of the chain ring, thereby shaping the joint. A method for shaping the welded part of the chain ring that makes up the chain.