KR20090094895A - Method of making muffler - Google Patents

Abstract

A muffler manufacturing method is provided to make the connection of piping very convenient and a assembling process simple by forming an inlet and outlet of the pipe into one body. A muffler manufacturing method comprises followings. A pipe, a preform is clamped. The pipe is a cylinder pipe cut in the predetermined length after extrusion molding the aluminum. The both end part of the clamped pipe is made to be narrowed in order to form an inlet(120) and an outlet(130). The inside diameter of the outlet and the inlet is cut. The outlet and the inlet of the pipe are extended after narrowing. A muffler includes a muffler body(110), the inlet, the outlet, and a tapered part(T).

Description

Method of making muffler

The present invention relates to a muffler manufacturing method that does not need to weld separate pipes by integrally forming the inlet pipe and the outlet pipe at both ends of the pipe seamlessly.

In general, as shown in FIG. 4, a vehicle air conditioner system compresses a refrigerant that performs heat exchange with outside air into a gaseous state of high temperature and high pressure, which is easily liquefied, in a gaseous state in the compressor (1), and condensate it (2). The refrigerant in the gaseous phase is changed into a liquid state through the condenser 2 and flows into the expansion valve 3, and the refrigerant changed into the liquid state is cooled by a throttling action of the expansion valve 3. , A low pressure wetted vapor state is introduced into the evaporator 4, and the refrigerant introduced into the evaporator 4 is discharged from the surrounding air.

It absorbs the heat (evaporation latent heat) necessary for evaporation, evaporates itself, changes to a gaseous state, and then repeatedly cycles into the compressor (1).

And, between the condenser (2) and the expansion valve (3) to receive the moisture contained in the refrigerant to remove or circulate or circulate gas refrigerant that is not liquefied in the condenser 2 to increase the cooling efficiency The dryer 5 is installed.

On the other hand, the inlet side of the compressor 1 is provided with a muffler 10 as shown in Figure 5 to reduce noise and vibration.

An inlet tube 12 connected to the outlet side of the evaporator 4 is installed at one side of the muffler 10, and an outlet tube 14 connected to the refrigerant inlet of the compressor 1 at the other side of the muffler 10. ) Is installed. The outlet pipe 14 is connected to the refrigerant inlet of the compressor 1 via the joint flange 16. The outlet side of the muffler 10 is made of a molded article that is reduced in diameter from the muffler body 10a to form an outlet 10b, and the outlet pipe 14 is fitted into the outlet 10b to be welded and fixed.

Therefore, since the outlet pipe 14 is welded to the outlet 10b in a seamless form, not only the welding process is additionally generated, but also the refrigerant may leak from the joint portion due to weld defects such as insufficient penetration or corrosion of the weld. very big.

In order to solve this problem, a muffler for a vehicle air conditioner disclosed in the publication of Utility Model No. 436233 has been proposed. As shown in FIG. 6, the muffler 30 is composed of a muffler body 33 which reduces noise and vibration by the space therein and an outlet pipe 34 connected to the refrigerant inlet of the compressor. The body 33 and the outlet pipe 34 are made of one molded article integrally molded.

However, the manufacture in which the muffler body 33 and the outlet pipe 34 are integrally molded without a seamless has not been practical.

On the other hand, the conventional muffler 50, as shown in FIG. 7, the inlet pipe 52 and the outlet pipe 54 are welded to both ends of the muffler body 53.

That is, a pipe extruded aluminum is cut by a predetermined length, and both ends thereof are conduited to form a short inlet side 52a and an outlet side 54a, and then to the inlet side 52a and outlet side 54a. Insert the inlet pipe 52 and the outlet pipe 54 and then fixed by welding.

Therefore, not only the welding process is additionally generated, but also there is a high possibility that the refrigerant leaks in the joint portion due to the welding defect such as insufficient penetration of the weld or corrosion.

On the other hand, there is also a muffler in which the preform is cold forged to preform the inlet tube at one end with the muffler body, and then the outlet tube is welded and fixed to the outlet side formed by condensing the other end of the muffler body.

However, in order to cold forge the preform, the process is complicated, such as annealing, and a release agent must be applied to remove the inlet tube and the muffler body from the forging die, and the inlet tube and the muffler body are vertically clamped. Each process takes up as much space as the vertical length of the muffler when rotating with a large number of small punches.

The present invention has been made to solve the above-described problem, and relates to a muffler manufacturing method that can be molded integrally with the outlet tube seamlessly.

In order to achieve the above object, the muffler manufacturing method of claim 1 of the present invention,

Clamping the pipe; Shaping both ends of the clamped pipe to form an inlet pipe and an outlet pipe; Lengthening the tube by inleting the inlet and outlet pipes; Cutting the inner diameters of the inlet pipe and the outlet pipe; And extending the length of the inlet pipe and the outlet pipe by cutting the inner diameter again.

According to this method, both ends of the pipe are formed integrally with the muffler body, the inlet pipe, and the outlet pipe seamlessly through the shaft pipe and the inner diameter processing, so that the assembly process is simple and the manufacture of the muffler without defects according to the welded portion is possible.

As is clear from the above description, the assembly process is simple and defects due to the welding part can be achieved by having a manufacturing technology capable of seamlessly forming the muffler body, the inlet pipe and the outlet pipe seamlessly through the shaft pipe and the inner diameter processing of both ends of the pipe. It is possible to manufacture a muffler without a pipe, and the connection of pipes is very convenient.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings, where like reference numerals refer to like parts, and a detailed description thereof will be omitted.

Moreover, although the taper part T is given to T1-T5 as shown in FIG. 2, this shows that taper inclination length increases little by little.

1 is a perspective view showing a muffler according to a preferred embodiment of the present invention, Figures 2 and 3 is a process chart for manufacturing the muffler of FIG.

As illustrated in FIG. 1, the muffler 100 according to the present embodiment includes a muffler body 110 having a cylindrical tube shape, and a seamless inlet pipe 120 formed at both ends of the muffler body 110 by shaft and inner diameter cutting. ) And the outlet pipe 130, the tapered portion (T).

The muffler body 110 has a larger diameter than the inlet pipe 120 and the outlet pipe 130.

Hereinafter, a method of manufacturing the muffler 100 having the seamless inlet pipe 120 and the outlet pipe 130 will be described with reference to FIG. 2.

First, a pipe P having a predetermined length, which is a preform shown in Fig. 2A, is prepared. The length of the pipe P is determined by the distance between the pipe and the pipe to be connected.

The pipe P is a cylindrical tube obtained by cutting an extruded aluminum material into a predetermined length.

In addition, the length L of the pipe P is, for example, two times longer than the conventional length L (muffler body + inlet + outlet) so that the length of the inlet pipe 120 and the outlet pipe 130 is pulled out integrally. It is preferable to make it longer.

The pipe P is clamped horizontally by clamping the pipe P, which is a preform, with a hydraulic clamp CP, as shown in FIG.

In the pipe P fixed to the clamp CP, when a punch having an inner diameter smaller than the outer diameter of the pipe P is simultaneously pressed from side to side, shaft pipes are performed at both ends of the pipe P as shown in FIG. .

This shaft pipe processing is the 1st shaft pipe work which the shape of the large diameter muffler body 110, the inlet pipe 120-1, the outlet pipe 130-1, and the taper part T1 appears.

When the primary shaft pipe is made, the lengths of the inlet pipe 120-1 and the outlet pipe 130-1 are slightly increased by L1 from the length L of the pipe P, and thus the inlet pipe 120-1 and the outlet pipe. The outer diameter of (130-1) also becomes small. The inclination length of the taper part T1 is short.

Inlet pipe 120-1 as shown in Fig. 2 (c) to (e) to further extend the length of the inlet pipe (120-1) and the outlet pipe (130-1) after the primary shaft pipe is performed. ) And the second, third, and fourth shafts with a punch having an inner diameter smaller than the outer diameter of the outlet pipe 130-1 and the inlet pipe 120-2-120-4 and the outlet pipe 130-2-130. The outer diameter of -4) decreases gradually, but its length gradually increases (L2 ~ L4).

Moreover, as 2nd thru | or 4th shaft pipe is performed, taper part T1 advances to taper parts T2-T4 which incline length increases a little.

When the fourth shaft pipe is made as shown in Fig. 2E, not only the length is increased, but also the inner diameters of the inlet pipe 120-4 and the outlet pipe 130-4 also increase and narrow. The inner diameter of Δ1 is cut as follows. It is preferable that internal diameter cutting is performed by a boring process. At this time, the length of the tapered portion T4 does not change.

After the 1st inner diameter cutting is performed, a 5th shaft pipe | tube is performed like FIG.3 (g).

The inlet pipe 120-6 and the outlet pipe 130-6 by the 5th shaft pipe are smaller than the outer diameter of the inlet pipe 120-5 and the outlet pipe 130-5 like other shaft pipes, but the length increases ( L5). At this time, the tapered portion T4 is inclined length is increased to the tapered portion (T5).

To further increase the lengths of the inlet pipe 120-6 and the outlet pipe 130-6, after the second inner diameter cutting is performed by Δ2 as shown in FIG. 3 (h) (taper portion T5 at this time) ) Length does not change), the inlet pipe (120-7) and the outlet pipe (130-7) is re-axially piped again.

By the sixth shaft pipe, the outer diameters of the inlet pipe 120-7 and the outlet pipe 130-7 decrease with increasing length (L6), so that the final muffler 100 as shown in FIG. Molded. Of course, after cutting the inner diameter again along the length of the inlet pipe and the outlet pipe can be carried out a shaft pipe to obtain a final shape that meets the product specifications. At this time, the tapered portion T having the same length as the product is formed.

As described above, when both ends of the pipe are axially piped, the length of the inlet pipe and the outlet pipe and the length of the taper portion gradually increase.

In addition, after performing a plurality of shaft pipes as described above, the inner diameter can be cut, or the shaft pipe and the inner diameter can be alternately cut.

In particular, cutting the inner diameter increases the size of the inner diameter, resulting in a relatively thin thickness (rather than the initial state), so that it is easily processed without a large force in the tube and thus has high processing efficiency and energy efficiency.

In addition, since the shaft pipe is carried out in a free surface state without applying cores or mandrels to the inner surfaces of the inlet pipe and the outlet pipe, fine cracks may occur on the inner surface of the inlet pipe and the outlet pipe. Crack removal or finishing improves mechanical strength and fluid flow.

In addition, the inlet pipe 120 and the outlet pipe 130 can be used by bending according to the connection direction.

As described above, after forming the inlet pipe and the outlet pipe by reducing the outer diameter of both ends of the pipe P, which is the preformed body, and continuing the shaft pipe, the length of the outlet pipe is further increased, and then the inner diameter of the inlet pipe and the outlet pipe. If the shaft pipe is cut again after cutting, the seamless inlet pipe and the outlet pipe can be integrally formed on the muffler body.

In addition, in the present embodiment, the inlet pipe 120 and the outlet pipe 130 may be used as the outlet pipe 120 and the inlet pipe 130 in reverse.

Since the extruded pipe can be cut and used in this way, the process of applying the release agent without performing the cold forging process is also required, and the heat treatment process such as annealing is also required. The advantage is that it does not occupy much space.

As described above, although described with reference to a preferred embodiment of the present invention, the present invention can be variously modified or modified without departing from the spirit and scope of the present invention described in the claims Those skilled in the art will appreciate.

The present invention can be applied to shaping predetermined inlet and outlet tubes in a cylindrical tube seamlessly.

1 is a perspective view showing a muffler according to a preferred embodiment of the present invention.

2 and 3 is a process chart for manufacturing the muffler of FIG.

Figure 4 is a schematic view showing an air conditioner system of a typical vehicle.

5 is a perspective view showing a muffler of a conventional vehicle air conditioner (flange coupled state).

Figure 6 is a perspective view (flange coupled state) showing a muffler of another conventional air conditioner for a vehicle.

7 is a perspective view showing a muffler having both ends of a conventional entrance and exit.

<Explanation of symbols for the main parts of the drawings>

100: muffler 110,120: inlet pipe

130: outlet pipe P: preform (pipe)

CP: Clamp T: Taper

Claims (1)

A clamping step of clamping the preformed pipe; Shaping both ends of the clamped pipe to form an inlet pipe and an outlet pipe; Lengthening the tube by inleting the inlet and outlet pipes; Cutting the inner diameters of the inlet pipe and the outlet pipe; Muffler manufacturing method comprising the step of increasing the length of the inlet pipe and the outlet pipe again cut the inner diameter.

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