KR20080047191A - Manufacturing thereof for oil cooler of automatic transmission - Google Patents

Abstract

A method for manufacturing an oil cooler of an automatic transmission is provided to reduce a manufacturing cost by processing welding on elements of the oil cooler through furnace blazing. Inner and outer pipes are manufactured by using a stainless plate(S10). Bosses are manufactured on a milling machine(S20). Welding washers are manufactured(S30). The outer pipes are formed(S40). The welding washers and the bosses are coupled each other by pressing(S50). Pins are formed by cutting the stainless plate(S60). The inner and outer pipes are bonded(S70). The inner and outer pipes and heat dissipation pins are assembled(S80). The inner and outer pipes are attached each other(S90). The heat dissipation pins are attached to the inner and outer pipes(S100). Welding rings and blazing jigs are mounted(S110). The bosses, both sealing parts, and the heat dissipation pins are welded by setting optimum welding conditions(S120). Leakage of the welding parts is inspected(S130). Final products are boxed(S140).

Description

MANUFACTURING THEREOF FOR OIL COOLER OF AUTOMATIC TRANSMISSION}

1 is a view showing a heat sink fin forming process in the oil cooler manufacturing process for an automatic transmission according to the prior art.

2 is a view showing the inner and outer pipe manufacturing process (S10) according to the present invention.

Figure 3 is a view showing an external pipe forming molding process (S40) according to the present invention.

Figure 4 is a view showing a crimping process (S50) of the weld washer and the boss in accordance with the present invention.

5 is a view showing a heat sink fin forming and cutting process (S60) according to the present invention.

Figure 6 is a view showing a step (S80) of assembling the appearance pipe, the heat radiation fin, the inner pipe according to the present invention.

7 is a view illustrating a terminal expansion process (S90) after the product assembly of FIG.

FIG. 8 is a view illustrating an internal expansion process (S100) in which the heat dissipation fins closely contact the inner and outer pipes in FIG. 6.

9 is an enlarged partial side cross-sectional view of a portion A in FIG.

FIG. 10 is a view illustrating a welding ring assembly and brazing jig mounting process (S110) and a brazing process 120 in FIG. 8.

11 is a diagram illustrating an airtight inspection process 130 according to the present invention.

12 is a view showing a packaging process (S140) according to the present invention.

13 is a block diagram showing a method for manufacturing an oil cooler according to the present invention.

* Description of the symbols for the main parts of the drawings *

10: oil cooler

12: appearance pipe

13: Boss

14: inner pipe

16: space part

18: heat radiation fins

19: Mold

20: sheet connection

22: welding washer

24: flow hall

25: forming jig

26: welding ring

27: Ball expansion jig

28: Brazing jig

30: Confidential Inspector

The present invention relates to a method of manufacturing an oil cooler for an automatic transmission, and more particularly, the welding process of each part of the oil cooler is made through furnace brazing, so that the conventional acid treatment process and heat treatment process are omitted, thereby mass production and cost. It relates to an oil cooler manufacturing method for an automatic transmission in which savings are made.

When describing a general method of manufacturing an oil cooler for an automatic transmission, 1) a process of processing the appearance pipe by cutting copper or brass pipe to a certain standard; 2) cutting the inner pipe (copper or brass pipe) to a certain standard; 3) process the boss on the lathe to a certain standard using a brass rod; 4) forming a flow hole in the outer pipe to facilitate mounting of a hole and a boss through which oil can flow at both ends of the inner pipe; 5) a boss welding process in which oxygen is welded after the boss is mounted on the outer pipe in which the flow hole is formed; 6) an acid treatment step of cleaning the surface by acid treatment of the oxidized portion after oxygen welding; 7) forming a heat sink fin by forming a brass plate with a heat sink fin rolling machine; 8) a step of assembling the outer pipe, the heat dissipation fin and the inner pipe, to which the boss is welded; 9) a terminal expansion step of enlarging both ends of the inner pipe so as to be in close contact with the outer pipe so as to seal both ends by the welding ring during brazing; 10) an internal expansion process of expanding the inner pipe of the assembled product to a predetermined standard such that the heat dissipation fins mounted on the space portion closely adhere to the inner and outer pipes; 11) a heat treatment (annealing) process of both terminal-extended ends; 12) an argon welding process for welding the expanded ends of the product; 13) airtight inspection process for mounting the finished product to the air tightness inspection to check the leakage of the weld; 14) The products are manufactured in the order of lot stamp and packaging process printed on the product date and packed in standard boxes.

In the manufacturing process of the conventional oil cooler for an automatic transmission as described above, the oil cooler is oxidized in the oxygen welding by oxygen welding the boss to the outer pipe, a process that must be subjected to acid treatment to remove it.

 Since the heat dissipation fins mounted between the inner and outer pipes are closely attached by expansion pipes, there is a problem that causes a decrease in heat dissipation performance.

In addition, there is a problem that the cost increase occurs in addition to the process of heat treatment in the oven for a certain time in order to perform argon welding on both ends of the terminal-expanded product.

The argon welding has a problem in that a high cost in manufacturing is generated in relation to only a highly skilled worker, and the quality is deteriorated due to leakage of the argon weld when the welding performance is reduced.

1 is a view showing a heat radiation fin forming process of the conventional oil cooler manufacturing process for automatic transmission.

Referring to the drawings, the heat radiation fin-forming rolling machine 2 pressurizes the brass plate (4) passing through to form the heat radiation fin (6).

In the process of forming the heat radiation fins, the heat radiation fins are formed using a rolling machine formed in the shape of heat radiation fins, but the cost of the heat radiation fin forming rollers is very high.

According to the required performance of the product, the heat dissipation fin should be molded in a different form, but there is a problem in manufacturing the heat dissipation fin is limited as a rolling machine.

The present invention has been proposed in order to solve the problems of the prior art, the object of the present invention is to mass production by eliminating the conventional acid treatment process and heat treatment process because the welding process of each part of the oil cooler is made through the furnace brazing It provides an oil cooler manufacturing method for an automatic transmission in which cost reduction is achieved.

In addition, the present invention is less wear because the heat radiation fin is formed by pressing with a heat radiation fin molding mold, and the maintenance cost is low because it is out of the manufacturing by expensive rolling machine, it is possible to manufacture a heat radiation fin in various forms, excellent performance automatic An oil cooler for a transmission and a method of manufacturing the same are provided.

In order to achieve the above technical problem,

In the method of manufacturing an oil cooler for an automatic transmission,

Forming a stainless steel plate in a circular shape and welding the same to produce an inner and outer pipe with a standard pipe (S10);

A step (S20) of processing the boss on the lathe according to the machining standard after cold forging molding using a stainless bar;

Process for punching the welding washer of a certain standard having a copper plate (S30);

Forming an exterior pipe to facilitate boss mounting in a flow hole through which oil may flow at both ends of the inner pipe (S40);

Pressing and fixing the weld washers and the boss to both ends of the outer pipe (S50);

Forming and cutting a stainless steel plate using a heat radiation fin molding mold (S60);

A step (S70) of welding the inner and outer pipes with copper components melted during the brazing of the copper-plated radiating fins between the inner and outer pipes;

A product assembly step (S80) of assembling the heat-dissipating fins and the inner tube pipes which are copper plated to the boss-compressed exterior pipes;

A terminal expansion step (S90) of expanding both ends of the inner pipe to closely contact the outer pipe;

An internal expansion step (S100) in which the heat radiation fins in the space portion formed by expanding the inner pipe of the assembled product to a predetermined standard adhere to the inner and outer pipes;

A welding ring assembly and brazing jig mounting process (S110) for mounting a welding ring at both ends of the product, preventing deformation and damage of the product put into the furnace brazing, and mounting the welding ring to a dedicated jig for inputting a large number of products;

A brazing step (S120) for welding by setting conditions (temperature, speed, gas flow rate, cooling water flow rate, and the like) such that each welding part (boss, both end sealing parts, and heat dissipation fin parts) of the product is welded under optimum conditions;

An airtight inspection process (S130) for inspecting a weld leakage by mounting the finished product to the hermetic inspection system;

Lot stamping and packaging process for printing the production date on the product and packing in a standard box (S140); It provides an oil cooler manufacturing method for an automatic transmission, characterized in that it is manufactured as.

Hereinafter, with reference to the accompanying drawings a preferred embodiment of the present invention will be described in more detail.

2 is a view showing the internal and external pipe manufacturing process (S10) according to the present invention, Figure 3 is a view showing the external pipe forming process (S40) according to the present invention, Figure 4 according to the present invention A diagram showing a crimping process (S50) of the weld washer and the boss.

And Figure 5 is a view showing a heat sink fin forming and cutting process (S60) according to the present invention, Figure 6 is a view showing a step (S80) of assembling the appearance pipe, the heat radiation fin, the inner pipe in accordance with the present invention, 7 is a view illustrating a terminal expansion process (S90) after the product assembly of FIG.

FIG. 8 is a view illustrating an internal expansion process (S100) in which the heat dissipation fin is in close contact with the inner and outer pipes in FIG. 6, and FIG. 9 is an enlarged partial side cross-sectional view of part A of FIG. 8.

FIG. 10 is a view illustrating a welding ring assembly and brazing jig mounting process (S110) and a brazing process 120 in FIG. 8, and FIG. 11 is a view illustrating an airtight inspection process 130 according to the present invention.

12 is a view showing a packaging process (S140) according to the present invention, Figure 13 is a block diagram showing a manufacturing method of the oil cooler according to the present invention.

Referring to the drawings, in the automatic transmission oil cooler 10, the inner pipe 14 is inserted into the outer pipe 12, and the space 16 is formed therebetween. Both ends of the inner and outer pipes 14 and 12 are sealed.

The heat dissipation fin 18 is inserted into the space portion 16, and the sheet connection portion 20 is formed such that the tube and the boss 13 communicate with the space portion 16 so as to distribute oil to both ends of the outer pipe 12. It is composed of assembly.

And the inner pipe 14 is both ends are end-expanded, the inside is ball is expanded is manufactured in close contact with the outer pipe 12 and the heat radiation fins (18).

Referring to the manufacturing method of the oil cooler for an automatic transmission made as described above, by forming a stainless steel plate in a circular shape to form a standard pipe and then cut to a certain length to produce the inner and outer pipes (14, 12) (S10). )do. In addition, using a stainless steel bar, the boss is processed on the lathe according to the machining standard after cold forging molding (S20).

And with a copper plate material to produce a weld washer 22 of a predetermined standard (S30).

After the boss is mounted in the flow hole 24 through which oil flows at both ends of the inner pipe 14, the outer pipe 12 is formed by forming (S40).

In addition, the weld washer 22 and the boss are crimped and fixed to both ends of the inner tube pipe 14 (S50). In order to mold the heat dissipation fins 18, the stainless steel sheet supplied to the mold 19 is fin-formed and cut into a predetermined length (S60). The heat dissipation fins 18 are first copper plated and then put into a welding process.

When brazing the inner and outer pipes 14 and 12 equipped with the heat dissipation fins 18, copper plated from the heat dissipation fins 18 melts to weld the outer pipes 14 and 12 (S70). .

The outer pipe 12 and the heat dissipation fin 18 and the inner pipe 14, which are copper plated with the boss crimped, are temporarily assembled in a semi-finished state (S80).

Thereafter, both ends of the inner tube pipe 14 are expanded with the forming jig 25 so that the terminal tube S90 is in close contact with the outer pipe 12. This is to ensure that both ends of the outer pipe 12 by the welding ring 26 when brazing.

The inner pipe 14 of the oil cooler 10 is a ball expansion jig 27, the inner expansion (S100) is made of the heat dissipation fin 18 mounted in the space 16 is the inner, outer pipe (14, 12) It comes in close contact with.

The terminal-expanded inner and outer pipes 14 and 12 are formed by mounting the welding ring 26 at both ends and mounting the oil cooler 10 in a semi-finished state where the assembly is completed to the dedicated brazing jig 28 (S110). Put in brazing. By using the dedicated brazing jig 28, it is possible to prevent product deformation and damage, and to input a lot of oil coolers 10.

Brazing welding by setting the temperature, speed, gas flow rate, cooling water flow rate, etc. so that each welding part (boss, both end sealing part, heat dissipation fin part) of the semi-finished product fixed to the brazing jig 28 is welded under optimum conditions. (S120).

As described above, the welded product is mounted on the airtightness tester 30 to inspect the welding part for leakage (S130).

When the airtight inspection is completed, the oil cooler 10 product is packaged (S140) in the lot seal and the standard box 32 to print the manufacturing date, the product is ready for manufacture and shipment is finally completed.

In manufacturing the oil cooler 1, as each part is made of stainless steel of a thin thickness, thermal conductivity, corrosion resistance and productivity are greatly improved.

In addition, since all welding processes are made through furnace brazing, the process is reduced and productivity is improved to reduce manufacturing costs.

As described above, according to the present invention, as the welding process for each part of the oil cooler is collectively processed through furnace brazing, the conventional acid treatment process and heat treatment process are omitted, and mass production through furnace brazing is possible, thereby reducing the cost. have.

And by inserting the welding ring on both ends of the terminal expansion, it is possible to prevent the deformation and damage of the product and to put a lot of products at the same time by inserting the welding ring in the brazing is in the optimum state.

Since the boss welding, the heat radiation fin welding, and the both ends sealing are welded through a single furnace brazing, the cumbersome processes such as conventional oxygen welding, acid treatment, heat treatment, and argon welding are omitted.

Since only the input and extraction in the brazing process is made by a general worker, there is no need for skilled workers, thereby reducing the cost.

Claims (4)

In the method of manufacturing an oil cooler for an automatic transmission, Forming a stainless steel plate in a circular shape and welding the same to produce an inner and outer pipe with a standard pipe (S10); A step (S20) of processing the boss on the lathe according to the machining standard after cold forging molding using a stainless bar; Process for punching the welding washer of a certain standard having a copper plate (S30); Forming an exterior pipe to facilitate boss mounting in a flow hole through which oil can flow at both ends of the inner pipe (S40); Pressing and fixing the weld washers and the boss to both ends of the outer pipe (S50); Fin-forming and cutting the stainless steel plate transferred to the heat-dissipating fin-forming mold (S60); A process of melting the copper plating component of the heat dissipation fin when the heat dissipation fins between the inner and outer pipes are brazed (S70); A product assembly process (S80) of assembling an outer pipe of which the boss is crimped, a heat-dissipating fin and an inner pipe that are copper-plated; A terminal expansion step (S90) of expanding both ends of the inner pipe to closely contact the outer pipe; An internal expansion process (S100) in which the heat radiation fins in the space portion formed by expanding the inner pipe of the assembled product to a predetermined standard adhere to the inner and outer pipes; A welding ring assembly and brazing jig mounting process (S110) for molding-mounting at both ends with a welding ring and mounting the product to a dedicated jig to prevent deformation and damage of the product and input a large amount when the product is put into the low brazing and welded; A brazing process (S120) for welding by setting conditions (temperature, speed, gas flow rate, cooling water flow rate, and the like) such that each welding part (boss, both end sealing parts, and heat dissipation fin parts) of the product is welded under optimum conditions; Airtight inspection process (S130) for inspecting the weld leakage by mounting the welded product to the air tightness checker; Lot stamping and packaging process for printing the manufacturing date on the product and packaging in a standard box (S140); Oil cooler manufacturing method for an automatic transmission, characterized in that is produced as. The method according to claim 1, In the step (S50), the external pipe and the boss are pressed and welded at the same time in the brazing brazing, characterized in that the oil cooler manufacturing method for automatic transmission. The method according to claim 1, Method for producing an oil cooler for an automatic transmission, characterized in that the heat radiation fins of various shapes are molded by the heat radiation fin molding die pressed in the step (S60). The method according to claim 1, In the step (S70), the heat dissipation fin is copper-plated to be welded to the inner and outer pipes, characterized in that the manufacturing method of the oil cooler for automatic transmission.

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