JPS59162318A - Manufacture of exhaust silencer - Google Patents

Abstract

PURPOSE:To enhance productivity of exhaust silencers by previously assembling the internal components of each exhaust silencer, by winding a plate forming an external cylinder round said assembly, and by fastening this plate to the end plates and partition plates as members of said internal components by means of laser welding. CONSTITUTION:Such internal components of an exhaust silencer are previously assembled into a single solid body, as end plates 1a, 1b, partition plates 2a, 2b, 2c, an inlet pipe 3a, outlet pipe 3b and inner pipes 3g, 3h, 3j. Here each pipe penetrates the burred holes provided in these end and partition plates and fastened by welding or using pressure. Thereafter an external cylinder 4 is formed around these end and partition plates by winding a plate double round the assembly, and then laser beam is irradiated to the external cylinder 4 to weld them fast.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of manufacturing an exhaust muffler installed in a vehicle.

As shown in FIG. 1 as a typical example, this type of muffler basically consists of end plates 1a, 1b, a plurality of partition plates 2a, 2b, 2c that partition the two end plates, and an end plate 1a, a partition plate 2a, 2
b, exhaust gas inlet pipe 3a penetrating 2G,
An exhaust gas outlet pipe 3b passing through the end plate 1b1 and the partition plates 2b and 2C, and an inner pipe 3G passing through each partition plate.
, 3d, 3e, 3f, and the outer periphery of these (consisting of an outer cylinder 4).

Although gas welding and arc welding are used in some cases as a means of joining each partition plate and the outer cylinder, spot welding is often used. In gas welding and arc welding, holes must be made in the outer cylinder at the welding point, and the heat affects a relatively wide area around the weld, so the plating on the outer cylinder may disappear or
Also, thermal distortion may occur. In this respect, spot welding is advantageous because there is no need to provide holes in the outer cylinder as described above and the range of thermal influence is relatively small.

However, in spot welding, it is necessary to use a chip to sandwich both sides of the stacked materials to be welded. Therefore, in the conventional manufacturing of the above-mentioned silencer, the outer cylinder 4 is first prepared, and the partition plate 2a12b and the pipe 3a are
13b, 3c, 3d, and 3e are assembled, and this is inserted into the outer cylinder 4, and welding tips are arranged on the outer periphery 7 flange part of the partition plate 2a and on both sides of the outer cylinder 4 overlapped with this. Then, the partition plate 2b is spot welded to the outer cylinder 4 in the same manner. Further, the partition plate 2G with the pipe 3f assembled thereon is inserted into the outer cylinder with the pipes 3a and 3b passing through it, and spot welded to the outer cylinder 4. In addition, the pipe 3a
The end opening on the partition plate 2C side is expanded. Furthermore, the end plates 1a and 1b are arranged at the openings at both ends of the outer tube 4, and the outer peripheries thereof are either wrapped tightly as shown in the figure or fixed to the outer tube 4 by spot welding.

An object of the present invention is to provide a method for manufacturing a muffler of good quality through a more simplified process compared to such conventional manufacturing methods.

Therefore, the inventors focused on laser welding as a welding method,
Assemble all end plates, bulkheads and pipes in advance,
Wrap the plate material that makes up the outer cylinder around the end plate and partition plate,
This plate material, the end plate, and the outer peripheral flange of the partition plate are laser welded from the outside of the outer cylinder to create a silencer. The above purpose is achieved by building the same.

Embodiments of the present invention will be described below with reference to FIGS. 2 and 3.

As shown in FIG. 2, end plates 1a, 1b, and end plate 2a.

2b12C, the inlet pipe 3a, the outlet pipe 3b, and the inch pipes 3g, 3h, and 3j are assembled together in advance. Each pipe is inserted into the burring hole of each end plate and bulkhead, and each pipe is inserted into the burring hole by welding means such as spot welding on the flange of the burring hole, or by forming a protrusion on the pipe and press-fitting this part into the burring hole. fixed by means.

In this way, the entire internal parts are integrated in advance, and the outer cylinder 4 and the plate material are wrapped around it in a double manner as shown in FIG. In addition, it is good also as -jyu or sanichimaki. Then, the outer cylinder 4 is irradiated with a laser beam and fixed by welding. For laser welding, a well-known laser device that focuses a laser beam with a condensing lens and irradiates the focused beam can be used.While rotating a silencer wrapped around an outer cylinder 4, the focused beam B is irradiated from the outside. and end plates 1a, 1b, partition plate 2a
, 2b, and the flange formed on the outer periphery of 20 and the outer cylinder 4 are welded.

According to the present invention, the internal components can be integrally configured in advance, thereby improving productivity. In addition, since laser welding allows the energy density to be concentrated, the thermal effect on areas outside the welded area is reduced, welding distortion is reduced, and welding accuracy can be increased. Furthermore, the outer peripheral flange of the end plate or partition plate to be welded to the outer plate can be made smaller. Furthermore, contact welding such as spot welding does not cause the problem of contact tips that wear out and often require replacement. Further, there is no need to prepare a pre-formed outer cylinder, and therefore a dedicated machine for forming an outer cylinder is not required. As described above, when manufacturing a silencer, the present invention not only contributes to improved workability, cost reduction, and energy saving, but also makes it possible to obtain a high-quality silencer with excellent welding accuracy.

[Brief explanation of the drawing]

FIG. 1 is a schematic cross-sectional view of a silencer, FIG. 2 is a diagram showing internal components that are integrated in advance to carry out the present invention, and FIG. 3 is a half-sectional view of the completed silencer. 1a, 1b... End plates 2a, 2b, 2c... Partition plates 3a, 3b, 3c, 3d, 3e, 3f, 3
(+, 3h13j...Pipe 4...Outer tube B...Laser beam

Claims (1)

[Claims] An internal component consisting of an end plate that forms both end surfaces of a muffler, a partition plate and end plate that are arranged between both end plates to partition the inside of the muffler, and a plurality of exhaust gas distribution pipes that are held through the partition plate. The JJI: Qi silencer is manufactured by 3i! When installing the internal components, the entire internal components are assembled in one piece in advance, and an outward component plate material is wound around the outer circumference of the internal component, and the plate material and the outer circumference of the end plate and the partition plate are fixed by laser welding. A method for manufacturing an exhaust silencer characterized by: