KR101166534B1 - Manufacturing thereof for oil cooler of automatic transmission - Google Patents

Abstract

According to the present invention, the welding process of each part of the oil cooler is performed through furnace brazing, so that an acid treatment process and a heat treatment process are not necessary, and mass production of the oil cooler through furnace brazing is possible, thereby reducing costs. The present invention relates to a method for manufacturing an oil cooler for an automatic transmission,
A product assembly process of assembling an outer pipe of which the boss is crimped together with a copper plated heat dissipation fin and an inner pipe; Expanding an end of the inner pipe in a turret manner by using a turret type expansion tool set having a double structure to seal both ends of the inner pipe and closely contact the outer pipe by brazing both ends by welding rings; An internal expansion process of expanding an inner surface of the inner tube pipe to a predetermined standard such that the heat dissipation fins mounted on the space portion closely contact the inner and outer pipes; A welding ring assembly and brazing jig mounting process of forming and mounting a welding ring on both ends of the terminal-expanded terminal and mounting it on a dedicated jig so that product deformation and damage can be prevented and a large amount can be input when the product is put into the brazing furnace and welded; It includes a brazing process for welding by setting the conditions (temperature, speed, gas flow rate, coolant flow rate, etc.) so that each welded part (boss, both end sealing part, heat dissipation fin part) of the product is welded at the optimum condition. .

Description

MANUFACTURING THEREOF FOR OIL COOLER OF AUTOMATIC TRANSMISSION}

The present invention relates to a method for manufacturing an oil cooler for an automatic transmission, and more particularly, by welding each part of the oil cooler through furnace brazing, so that an acid treatment process and a heat treatment process are not required separately. The present invention relates to a method for manufacturing an oil cooler for an automatic transmission, characterized in that the mass production of the oil cooler is made possible through cost reduction.

Referring to the general manufacturing method of the oil cooler for automatic transmission is as follows.

1) process of cutting the appearance pipe by cutting copper or brass pipe to a certain standard;

2) processing the inner pipe by cutting the inner pipe (copper or brass pipe) to a predetermined standard;

3) the process of processing the boss in the lathe to a certain machining standard using a brass rod;

4) forming a flow hole so that oil flows in both ends of the inner pipe and the boss is easily mounted;

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 radiation fin of the brass plate by rolling;

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 so that the heat dissipation fins mounted on the space portion closely adhere to the inner and outer pipes;

11) an annealing process of heat treating the product for argon welding of both ends of the product;

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) It is manufactured in the order of lot stamping and packaging process by printing the manufacturing date on the product and packing it in the standard box.

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).

Looking at the conventional process of manufacturing an oil cooler for an automatic transmission as described above, the oil cooler is an oxygen welding of the oxygen welding portion by the oxygen welding of the boss on the outer pipe, and there is a troublesome process that requires an acid treatment to remove it.

In addition, since the heat generating fins are in close contact with each other only through expansion in a state in which the heating fins are mounted between the inner and outer pipes, there is a problem that causes a decrease in heat dissipation performance.

That is, the heat dissipation performance is deteriorated because the product is manufactured only by expansion pipe in a state where welding is not performed with the inner and outer pipes.

In addition, there is a limit in the expansion amount because the inner pipe pipe is expanded and once expanded by the ball punch when closely contacting the outer pipe.

In addition, when the height of the heat dissipation fins mounted on the inner side is high, the gap between the both ends of the outer space of the outer pipe is large, causing a problem that the inner pipe bursts during expansion, resulting in a limitation of the height of the heat dissipation fins. have.

In addition, a process in which heat treatment is performed in an oven for a predetermined time in order to perform argon welding on the expanded both ends of the product is generated, and in addition, argon welding can be performed by high skilled workers, resulting in high manufacturing cost and welding. There was a problem that the quality deterioration due to leakage of argon welds due to deterioration of performance.

In addition, in the method for forming the heat radiation fin (see FIG. 1), the heat radiation fin is formed by using a rolling machine in which the heat radiation fin shape is formed. Since the heat radiation fin forming roller is expensive, the cost loss due to roller wear is very large. And, according to the required performance of the product, the heat radiation fins should be molded in various forms, but there is a limit to the production of various heat radiation fins by the rolling method.

The present invention has been proposed to solve the problems of the prior art, and an object of the present invention is that the welding process of each part of the oil cooler is performed through furnace brazing, so that an acid treatment process and a heat treatment process are not necessary. It is an object of the present invention to provide a method for manufacturing an oil cooler for an automatic transmission in which mass production is possible through brazing to reduce cost.

In addition, the present invention has a purpose to be able to produce a heat radiation fin mold at a very low price compared to a roller of high price because it is molded into a press die without forming the heat radiation fin by a rolling method.

In addition, the present invention is to enable the low brazing welding by pressing the boss with the weld washer on the outer pipe, the heat dissipation fins mounted on the inner pipe and the outer pipe is copper plated to melt the plated copper during the low brazing welding, welding with the outer pipe It is an object of the present invention to provide an oil cooler for an automatic transmission excellent in heat dissipation performance and a method of manufacturing the same.

In addition, the expansion process to seal the both ends after attaching the heat radiation fins to the inner and outer pipes is carried out with a turret type expansion tool set instead of the conventional tapered type expansion method, but installs a plurality of first division type forming jigs in multiple stages. The turret type forming jig presses the primary split type forming jig and expands both ends of the inner and outer pipes step by step to improve the expandability by maximizing the elongation of the material, thereby extending the selection range of the heat sink fins. have.

As a means for achieving the above object,

The present invention provides a method for manufacturing an oil cooler for an automatic transmission,

Forming a standard pipe by forming and welding a stainless steel plate in a circular shape, and then cutting the stainless plate into a predetermined length to manufacture an internal and external pipe (S10);

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

Punching the copper plate material with a welding washer of a predetermined standard (S30);

Forming a facade pipe to facilitate mounting of a boss that is a counterpart and a flow hole through which oil can flow in both ends of the inner pipe (S40);

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

Manufacturing a mold in order to mold the heat dissipation fins and transferring the stainless steel sheet to mold the fins and cutting the fins to a predetermined length (S60);

A product assembly step (S70) of assembling the external pipe with the boss crimped together with the heat-dissipating fins and the inner tube pipes;

In order to close both ends of the inner pipe and to close the pipe by brazing, the multi-stage expansion is made by using a plurality of turret type expansion tool sets consisting of a primary split type forming jig and a secondary turret type forming jig. Expanding the end of the inner pipe by the method (S80);

An inner expansion process (S90) of expanding the inner surface of the inner tube pipe to a predetermined standard such that the heat dissipation fins mounted on the space portion closely contact the inner and outer pipes;

Welding ring assembly and brazing jig mounting process (S100) for molding and mounting the welding ring to the expanded both ends and mounting to the dedicated jig so that product deformation and damage prevention and a large amount can be input when the product is put into the brazing furnace and welded;

A brazing step (S110) 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 (S120) of mounting the finished product to the hermetic inspection device to inspect the weld leakage;

It is characterized in that it is manufactured by; lot stamping and packaging process (S130) for printing the production date on the product and packaging in a standard box.

In addition, the process (S80) of expanding the end of the inner pipe,

(1) provided with a turret type expansion tool set for expanding the inner pipe, wherein the turret type expansion tool set is joined by a restoring spring in a six equal or eight equal state and a tapered space inside the combined structure A first divided forming jig having a portion and a tapered outer end portion tapered at an angle, and a first divided forming jig divided into a predetermined number in a radial direction by temporarily coupling to the first divided forming jig. Pushing to expand the end of the inner tube pipe, comprising: a secondary turret-forming forming jig having an outer tapered shape to be inserted into the tapered space portion;

(2) comprising a plurality of primary splitting forming jig, and arranging a plurality of the first divisional forming jig in multiple stages so that the width of the portion contacting the inner pipe gradually increases;

(3) The second turret-type forming jig is advanced and fitted into the tapered groove of the first-dividing forming jig in a state where the width of the portion of the first-dividing forming jig that is in contact with the inner pipe is the thinnest in contact with the inner pipe. Combining;

(4) continuously advancing the secondary turret-forming forming jig in such a state that the primary splitting forming jig is divided into a plurality of pieces along the separation surface and the end of the inner pipe is pushed in a radial direction;

(5) thereafter, when the secondary turret-forming forming jig is retracted, the separation surface of the primary-dividing forming jig is retracted by the spring force to return to the temporarily coupled state;

(6) Thereafter, the second turret-forming forming jig is advanced to extend the end of the inner pipe a little longer while the forming jig thicker than the thickness of the first primary splitting forming jig is brought into contact with the end of the inner pipe. This is a feature.

The present invention has the following effects.

(1) The welding process of each part of the oil cooler is done through furnace brazing, which eliminates the need for acid treatment and heat treatment, and enables mass production through low brazing.

(2) Since the heat radiating fins are not formed by a rolling method, they are formed into a press die, thereby producing a heat radiating fin mold at a very low price compared to a roller having a high price.

(3) The heat radiation fin mold can be produced in various forms.

(4) Low brazing welding is possible by pressing the boss with the welding washer on the outer pipe, and the heat radiation fins mounted on the inner pipe and the outer pipe are copper plated so that the plated copper melts and welds to the outer pipe during the low brazing welding. By doing so, the heat dissipation performance is excellent.

(5) The first split type forming jig and the second turret type forming jig are used to make a turret type expansion tool set, and the first split type forming jig is installed in multiple stages and the second turret type forming jig is pressed with the first split forming jig. By expanding the both ends of the inner and outer pipes in stages, there is an effect that can widen the selection range of the heat radiation fins.

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 process (S60) of pin forming and cutting made of stainless steel plate according to the present invention.
Figure 6 shows a step (S80) of assembling the product in the order of the appearance pipe, the heat radiation fin, the inner pipe according to the present invention.
Figure 7 is a turret type expansion tool set configuration for expanding the inner pipe of the present invention.
Figure 8 is a combination of turret type expansion tool set for the inner pipe expansion of the present invention.
9A-9E are working state diagrams expanding the inner pipe of the present invention in stages.
FIG. 10 is a view illustrating an internal expansion process S100 for allowing the heat dissipation fins to closely contact the inner and outer pipes of FIG. 6.
FIG. 11 is an enlarged partial side cross-sectional view of a portion A in FIG. 10; FIG.
12 is a view showing the welding ring assembly and brazing jig mounting process (S110) and brazing process (S120) after the internal expansion in FIG.
Figure 13 is a view showing the airtight inspection step (S130) according to the present invention.
14 is a view showing a packaging process (S140) according to the present invention.
15 is a block diagram illustrating a method of manufacturing an oil cooler according to the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. First of all, in adding reference numerals to the components of each drawing, it should be noted that the same reference numerals are used as much as possible even if displayed on different drawings. In addition, in the following description of the present invention, if it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are intended to provide further explanation of the invention as claimed.

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

And Figure 5 is a view showing a fixed (S60) pin forming and cutting with a stainless steel plate according to the present invention, Figure 6 is a process of assembling the product in the order of the appearance pipe, heat radiation fins, inner pipe according to the present invention (S80). 7 to 9a to 9e illustrate an apparatus and a working state for expanding an inner pipe, and FIG. 7 is a configuration diagram of a turret type expansion tool set for expanding an inner pipe of the present invention. 8 is a coupling diagram of a turret type expansion tool set for expanding an inner pipe of the present invention, and FIGS. 9A to 9E are diagrams illustrating an operation state for gradually expanding the inner pipe of the present invention.

In addition, FIG. 10 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. 11 is an enlarged partial side view of part A in FIG. 10.

FIG. 12 is a view illustrating a welding ring assembly and brazing jig mounting process (S110) and a brazing process (S120) after expansion in FIG. 10, and FIG. 13 is a diagram illustrating another airtight inspection process (S130) according to the present invention. 14 is a view showing a packaging process (S140) according to the present invention.

Referring to the drawings, the automatic transmission oil cooler 10 has an inner pipe 14 inserted into the outer pipe 12, and the space 16 is formed between the outer pipe and the inner pipe. Then, both ends of the outer pipe 12 and the inner pipe 14 are sealed.

At this time, the heat dissipation fin 18 is inserted into the space 16, and configured to allow the oil to flow to both sides of the outer pipe 12, the tube and the boss 13 to communicate with the space 16 oil The sheet connection part 20 which is passed through is assembled to both sides of the upper surface of the outer pipe 12.

And the inner pipe 14 is expanded to the both ends, and by expanding the ball on the inner surface except for the both ends are manufactured so that the outer surface of the inner pipe is 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, first, by forming a stainless steel sheet in a circular shape welded to make a standard pipe, and then cut to a constant length of the outer pipe 12 and the inner pipe (14) is manufactured (S10).

In addition, the boss 13 is processed on the lathe according to the machining standard after cold forging molding using a stainless steel bar (S20).

Then, a welding washer 22 of a predetermined standard is manufactured from the copper plate (S30).

A flow hole 24 through which oil may flow is formed at both ends of the outer pipe 12, but the flow hole 24 is formed while forming a horizontal plane to facilitate boss mounting (S40).

In addition, the weld washer 22 and the boss 13 are pressed and fixed to both ends of the outer pipe 12 (S50).

The mold 19 for forming the heat dissipation fin 18 is prepared in advance, and a pin is formed by applying pressure to the mold from upper and lower parts to the transferred stainless steel or iron plate (S60). At this time, the heat dissipation fin 18 is made of copper plating in a plate state, and then a pin forming process is performed, and the plated copper is welded by melting copper in a brazing process.

The boss 13 is coupled to the outer pipe 12, the copper plated heat dissipation fin 18 and the inner tube pipe 14 is combined to complete the assembly of the component (S70).

Thereafter, both ends of the inner pipe 14 are expanded with the turret type expansion tool sets 25a and 25b to closely contact the outer pipe 12 (S80).

The method for expanding both ends of the inner pipe is described in detail as follows.

(1) provided with a turret type expansion tool set for expanding the inner pipe, wherein the turret type expansion tool set is joined by a restoring spring in a six equal or eight equal state and a tapered space inside the combined structure A first divided forming jig having a portion and a tapered outer end portion tapered at an angle, and a first divided forming jig divided into a predetermined number in a radial direction by temporarily coupling to the first divided forming jig. Pushing to expand the end of the inner tube pipe, it is provided with a secondary turret jig made of a tapered shape on the outside to be inserted into the tapered space portion.

(2) It is provided with a plurality of primary splitting forming jig, but arranged in a plurality of stages so that the width of the portion in contact with the inner pipe is gradually thickened.

(3) The second turret-type forming jig is advanced and fitted into the tapered groove of the first-dividing forming jig in a state where the width of the portion of the first-dividing forming jig that is in contact with the inner pipe is the thinnest in contact with the inner pipe. Combine.

(4) In this state, if the secondary turret type forming jig is continuously advanced, the primary splitting forming jig is divided into a plurality of pieces along the separation plane and the end of the inner pipe is pushed in the radial direction to expand.

(5) After that, when the secondary turret-forming forming jig is retracted, the separating surface of the primary-dividing forming jig is retracted by the spring 25c force and returned to the temporarily coupled state.

(6) After that, the secondary turret type forming jig is advanced while the forming jig thicker than the thickness of the first primary splitting forming jig is brought into contact with the end of the inner pipe so as to further expand the end of the inner pipe.

(7) In this way, the ends of the inner pipes were gradually expanded in sequence, and in the present invention, five end split-forming jigs were provided in total so that the ends of the inner pipes were sequentially expanded.

That is, in the present invention, the heat dissipation fin is mounted on the inner and outer pipes, and the expansion process for sealing both ends is expanded by the turret expansion method rather than the conventional ball type expansion method, and more specifically, the primary division divided into six equal parts. It is a double extension tool of type forming jig and secondary turret type forming jig.

Accordingly, the first split type forming jig divided into six equal parts inside the inner pipe is inserted first, and the second turret type forming jig is put in, and the primary expansion jig is increased by the turret method to facilitate expansion. The expansion tool was installed in multiple stages to increase the expansion rate at each step, thereby buffering the expansion stress of the inner pipe step by step to improve the expansion rate, thereby expanding the selection range of the heat radiation fins.

9A to 9E illustrate a multi-stage turret type expansion tool set, in which an end portion of the primary split type forming jig is arranged a little larger, and initially, a small forming jig t1 is installed to install the inside of the inner pipe. And install the forming jig (t2), which is thicker and thicker, and expand the inside of the inner pipe more, and in this way, the thicker forming jig (t3, t4, t5) is installed sequentially to install the inner pipe. It is to expand slowly.

Meanwhile, the inner pipe 14 of the assembled product is expanded to a predetermined standard by the uncertain pipe jig 27 so that the heat dissipation fins 18 mounted on the space 16 are in close contact with the inner and outer pipes 14 and 12. (S90).

The welding ring 26 is molded and mounted at both ends of the inner and outer pipes 14 and 12 which are expanded.

Mounting the oil cooler 10 in the semi-finished state of assembly is mounted to the brazing jig 28 (S100).

Brazing after setting the conditions (temperature, humidity, gas flow rate, cooling water flow rate, etc.) so that each welding part (boss, both end sealing part, heat dissipation fin part) of the product fixed to the brazing jig 28 is welded to the optimum condition. Weld (S110).

At this time, the heat dissipation fin 18 is mounted between the outer pipe 12 and the inner pipe 14, the copper plating component of the heat dissipation fin 18 is melted during brazing welding, and welded to the outer pipe 14, 12. .

As described above, the welded product is mounted on the airtightness checker 30 to check the leak of the welded portion (S120).

The oil cooler 10 product of which the airtightness inspection is completed is finally completed until the manufacture and shipment preparation of the product in which the lot stamping packaging for printing the manufacturing date in the standard box 32 is completed (S130).

In manufacturing the oil cooler 1 according to the above, the material of each component is made of stainless steel and is formed in a thin thickness to significantly improve thermal conductivity, corrosion resistance and productivity.

In addition, since all welding processes are made through furnace brazing, manufacturing cost is reduced through process reduction and productivity improvement.

The above description is merely illustrative of the technical idea of the present invention, and those skilled in the art to which the present invention pertains may make various modifications and changes without departing from the essential characteristics of the present invention. That is, the embodiments disclosed in the present invention are not intended to limit the technical spirit of the present invention but to describe the scope of the technical spirit of the present invention by these embodiments. Therefore, the protection scope of the present invention should be interpreted by the claims below, and all technical ideas within the equivalent scope will be construed as being included in the scope of the present invention.

10: oil cooler
12: appearance of pipe
13: boss
14: inner pipe
16: space part
18: heat sink fin
19: Mold
20: sheet connection
22: weld washer
24: floating hole
25a: 1st split forming jig
25b: 2nd turret forming jig
25c: spring
26: welding ring
27: Ball expansion jig
28: Brazing Jig
30: Leak Detector

Claims (2)

delete Oil cooler manufacturing method for automatic transmission,
Forming a standard pipe by forming and welding a stainless steel plate in a circular shape, and then cutting the stainless plate into a predetermined length to manufacture an internal and external pipe (S10); A process of machining the boss on the lathe according to the machining standard after cold forging molding using a stainless bar (S20); Punching the copper plate material with a welding washer of a predetermined standard (S30); Forming a facade pipe to facilitate mounting of a boss that is a counterpart and a flow hole through which oil can flow in both ends of the inner pipe (S40); A step (S50) of pressing and fixing the weld washers and the boss to both ends of the outer pipe; Manufacturing a mold in order to mold the heat dissipation fins and transferring the stainless or iron plate to form a fin and cutting to a predetermined length (S60); A product assembly step (S70) of assembling the external pipe with the boss crimped together with the heat-dissipating fins and the inner tube pipes; In order to close both ends of the inner pipe and to close the pipe by brazing, the multi-stage expansion is made by using a plurality of turret type expansion tool sets consisting of a primary split type forming jig and a secondary turret type forming jig. Expanding the end of the inner pipe by the method (S80); An inner expansion process (S90) of expanding the inner surface of the inner tube pipe to a predetermined standard such that the heat dissipation fins mounted on the space portion closely contact the inner and outer pipes; Welding ring assembly and brazing jig mounting process (S100) for molding and mounting the welding ring in the expanded both ends and mounting to the dedicated jig so that product deformation does not occur and damage is prevented when the product is put into the brazing furnace and welded; A brazing step (S110) 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 (S120) of mounting the finished product to the hermetic inspection device to inspect the weld leakage; In the production process of the oil seal for the automatic transmission manufactured by the lot stamping and packaging process (S130) for printing the date of manufacture on the product and packaging in a standard box,
Process (S80) of expanding the end of the inner pipe,
(1) provided with a turret type expansion tool set for expanding the inner pipe, wherein the turret type expansion tool set is joined by a restoring spring in a six equal or eight equal state and a tapered space inside the combined structure A primary splitting forming jig having a portion and an outer end portion of the inner end pipe contacting the inner pipe and tapered at an angle;
It is to expand the end of the inner pipe by pushing the first divided forming jig which is equally divided into a predetermined number in a radial number by temporarily coupling to the first divided forming jig, and the outer side is tapered so as to be inserted into the tapered space part. Providing a secondary turret-forming foam jig formed in a shape;
(2) comprising a plurality of primary splitting forming jig, and arranging a plurality of the first divisional forming jig in multiple stages so that the width of the portion contacting the inner pipe gradually increases;
(3) The second turret-type forming jig is advanced and fitted into the tapered groove of the first-dividing forming jig in a state where the width of the portion of the first-dividing forming jig that is in contact with the inner pipe is the thinnest in contact with the inner pipe. Combining;
(4) continuing to advance the secondary turret-forming forming jig in the fitting step so that the primary splitting forming jig is divided into a plurality of portions along the separation surface and the end of the inner pipe is pushed in a radial direction;
(5) thereafter, when the secondary turret-forming forming jig is retracted, the separation surface of the primary-dividing forming jig is retracted by the spring force to return to the temporarily coupled state;
(6) Thereafter, the second turret-forming forming jig is advanced to extend the end of the inner pipe a little longer while the forming jig thicker than the thickness of the first primary splitting forming jig is brought into contact with the end of the inner pipe. Oil cooler manufacturing method for an automatic transmission characterized in that.

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