KR102327030B1 - Refrigerant pipe bending forming method for heat sink and refrigerant pipe for heat sink manufactured thereby - Google Patents

Abstract

The present invention relates to a refrigerant pipe bending molding method for a heat sink and a refrigerant pipe for a heat sink manufactured thereby, which is used for cooling components of various electric, electronic, and communication devices. More specifically, the method processes three-dimensional bending on the refrigerant pipe for a heat sink in an X, Y, and Z directions according to the following processes. A first bending process (S1) perpendicularly bends a stainless or steel pipe (2) mounted on a chuck clamp (10) by a first bending mold unit (100). The second bending process (S2) bends the stainless or steel pipe (2) in a U shape by the first bending mold unit (100). After repeatedly performing the first bending process and the second bending process, the third bending process (S3) perpendicularly bends the stainless or steel pipe (2) by the first bending mold unit (100) again. Then, the third bending process (S3) perpendicularly bends the stainless or steel pipe (2) by the second bending mold unit (200). The present invention has simple manufacturing processes and reduces manufacturing cost and manufacturing time by integrated bending processes, and provides excellent cooling efficiency by closely processing a banding interval when applied to the heat sink.

Description

Refrigerant pipe bending forming method for a heat sink and a refrigerant pipe for a heat sink manufactured thereby

The present invention relates to a refrigerant pipe for a heat sink used for cooling parts in various electric, electronic and communication devices, and more particularly, a three-dimensional bending process of a refrigerant pipe made of steel (especially stainless steel) in the XY and Z axes. , a bending molding method for a heat sink that has a simple manufacturing process, reduced manufacturing cost and shortened manufacturing time, and has excellent cooling efficiency by close processing of the banding interval, as well as a refrigerant pipe for a heat sink manufactured thereby will be.

In general, heat sinks are used to cool components in various electrical, electronic and communication devices.

For example, in the case of a rectifier, it is generally used to convert AC power to DC power. In particular, rectifiers such as communication equipment are used as large-capacity semiconductor rectifiers. In this case, a heat sink is used to prevent overheating because the semiconductor generates excessive heat when current flows.

That is, since a semiconductor (bridge diode, IGDT) is attached and installed on the heat sink to cool the semiconductor heat by the heat sink, overheat damage to the component is prevented.

The heat sink used in this way is to install a bending-molded refrigerant pipe inside the plate-shaped panel to circulate the refrigerant, and cool the semiconductor installed in the panel.

At this time, the plate-shaped panel is installed by forming a vertical panel portion protruding from the upper side, and the semiconductor is erected and installed, and the refrigerant pipe is also installed inside the vertical panel portion to pass through.

As described above, the refrigerant pipe installed inside the heat sink panel consists of a part installed inside the plate-shaped panel and a part installed inside the vertical panel. It consists of a three-dimensional structure forming a bending part, a Z-axis bending part bent in a U shape, and a Y-axis bending part.

Conventionally, there is a limit that the refrigerant pipe cannot be integrally bent.

That is, since the refrigerant pipe is made of steel and stainless steel and has low elasticity, bending processing is not easy unlike general aluminum pipes. Since it is manufactured in a structure of connecting and assembling, automatic production is not possible, so manufacturing productivity is lowered, manufacturing cost increases, and manufacturing time is required.

In addition, as shown in FIG. 1 , there was a problem in that the bending portion of the refrigerant pipe was deformed or the diameter was reduced due to the deterioration of the commercial value.

In addition, it was not easy to form the refrigerant pipe in proximity bending. Of course, proximity bending by heat treatment can be performed, but in this case, since corrosion resistance is weak, proximity bending cannot be performed without heat treatment.

Publication No. 10-2018-0118933 (November 01, 2018) Registered Patent No. 10-0914885 (August 25, 2009)

The present invention was invented to solve all the problems of the prior art, and the refrigerant pipe made of steel (especially stainless steel) is subjected to three-dimensional bending in the XY and Z axes, but the manufacturing process is simple and manufacturing because it is integrally bent. The purpose is to reduce the cost and shorten the manufacturing time, as well as to provide excellent cooling efficiency by close processing the banding interval.

An object of the present invention is to provide excellent bending quality of the refrigerant pipe while performing bending without deformation of the bending portion of the refrigerant pipe or the reduction in diameter.

The present invention relates to a first method in which a stainless or steel pipe is mounted on a chuck clamp capable of rotational movement control with forward, backward, left and right and vertical movement, and then the first bending mold part rotates 90° while moving forward to bend the stainless or steel pipe at a right angle. banding process; a second bending process in which the chuck clamp rotates the stainless or steel pipe by 180° and moves the pipe to the next bending position, and then rotates the first bending mold part by 180° while moving forward again to U-bend the stainless or steel pipe; After repeating the second bending process, the chuck clamp rotates the stainless or steel pipe by 180° and moves it to the next bending position, and then moves forward again while the first bending mold part rotates 90° to right-angle the stainless or steel pipe. 3 banding process; The chuck clamp lifts the stainless or steel pipe away from the first bending mold part, and then inverts the mold die in which the first bending mold part and the second bending mold part are installed up and down, and the stainless or steel pipe is second bent Lower it to the mold, rotate 90° so that the U-shaped bending part of the stainless or steel pipe is positioned up and down and move it to the next bending position. It is characterized by providing a method for forming a refrigerant pipe bending for a heat sink, characterized in that the automatic manufacturing.

According to the present invention, in the first bending mold part, a first bending mold having a circular curved part molding groove and a straight part molding groove formed on the outside thereof, and a first driving part on the side of the first bending mold part move forward and backward and rotate up and down to rotate the first tooth for fixing the stainless steel or steel pipe in the straight part forming groove of the bending mold by the rotation driving unit; A stainless or steel pipe is transported and guided by a fixed guide forming a guide groove at the rear of the first bending mold, and a moving guide moving back and forth by a second driving unit on the side of the fixed guide, but the moving guide is a stainless or steel pipe while moving forward together, the first bending mold and the first tooth are rotated by the rotary driving unit to bend the stainless steel or steel pipe; In the second bending mold part, a second bending mold having a circular curved part molding groove and a straight part molding groove formed on the outside, and a straight part molding groove of the bending mold by moving back and forth by a third driving part from the side of the second bending mold It is characterized in that the second tooth for fixing the stainless steel or steel pipe is rotationally driven by the rotation driving unit to bend the stainless steel or steel pipe.

According to the present invention, a non-slip groove is formed on the inner periphery of the straight part forming groove of the bending mold to prevent the stainless or steel pipe from slipping when bending while rotating by fixing the stainless or steel pipe with a tooth. There is a characteristic.

The present invention is characterized in that the refrigerant pipe is provided so that the interval between the pipes of the Z-axis bending part is close to 2.5d or less compared to the pipe diameter (d).

The present invention provides a first bending process of right-angle bending a steel (especially stainless steel) pipe mounted on a chuck clamp by a first bending mold part; After repeating the second bending process of U-bending the stainless or steel pipe by the first bending mold part, a third bending process of right-angle bending the stainless or steel pipe again by the first bending mold part; and The heat sink refrigerant pipe is subjected to three-dimensional bending in the XY and Z axes by the third bending process of bending at right angles by the second bending mold part of the stainless steel or steel pipe. And it has the effect of providing excellent cooling efficiency when applied to a heat sink by shortening the manufacturing time as well as close-processing the banding interval.

In particular, compared to the conventional refrigerant pipe manufacturing process, since the stainless or steel pipe is moved and supplied and supported while bending is performed while the stainless or steel pipe is firmly fixed, the bending part is deformed or the diameter is reduced. It has the effect of providing excellent bending quality of the refrigerant pipe during the bending process.

1 is a photograph showing a refrigerant pipe manufactured and assembled by a conventional bending process;
Figure 2 is a flow chart of the manufacturing method of the present invention.
3 is a plan view showing a first mold part of the present invention.
Figure 4 is a front view of the main part of Figure 3;
Figure 5 is a front view showing the main part of the fixing structure of the stainless steel or steel pipe by the first bending mold and the first tooth in Figure 3;
6 is a perspective view showing a first mold part of the present invention.
7 to 15 are plan views showing a bending process by the first mold part.
16 and 17 are plan views showing a bending process by a second mold unit.
18 is a perspective view showing a refrigerant pipe bent by the present invention.
19 is a photograph of the product of FIG. 18 .
20 and 21 are a plan view and a front view showing a heat sink to which the refrigerant pipe of the present invention is applied.

First, a method for forming a refrigerant pipe bending for a heat sink according to the present invention will be described.

As shown in FIGS. 2 to 17, the present invention bends a stainless or steel pipe 2 formed of steel, stainless steel, or a similar material in the XY and Z axes, but in the first, second, third, and fourth bending processes. (S1) (S2) (S3) (S4) through the automatic bending process by the refrigerant pipe (2') is to be integrally manufactured.

In the first bending process ( S1 ), the rear end of the stainless or steel pipe 2 is inserted and mounted in the chuck clamp 10 .

In addition to the mounting of the stainless steel or steel pipe 2, the chuck clamp is capable of rotating and rotating the stainless or steel pipe 2 forward, backward, left and right, and up and down by a rail or a rotating motor (not shown) in the bending process.

And inside the stainless or steel pipe (2), a mandrel is inserted and installed up to a position before the bending part.

At this time, the tip of the stainless or steel pipe 2 is located in the first bending mold part 100, and the first bending mold part 100 is formed with a circular curved part molding groove 21 and a straight part on the outside. The first bending mold 20 in which the groove 22 is formed and the first bending mold 20 side by the first driving part 35 move back and forth and rotate up and down to form the straight part forming groove 22 of the bending mold A first tooth 30 for fixing the supplied stainless or steel pipe 2 is provided, a fixing guide 40 for forming a guide groove 41 at the rear of the bending mold, and a second driving unit from the side of the fixing guide In addition to moving forward and backward by 46, the stainless or steel pipe 2 is transported and guided by the moving guide 45 that supports the same while moving forward along the rail along with the forward movement of the stainless or steel pipe in the pipe bending process. It is prepared so that the tip of the stainless or steel pipe (2) is inserted into the straight part forming groove (22) of the bending mold and the guide groove (41) of the fixing guide (40).

In this state, as the first tooth 30 moves forward by the first driving unit 35 as shown in FIG. 5, the guide pin 31 on the side of the first tooth is guided along the guide groove 32 of the guide plate. The first tooth 30 rotates upward to fix the stainless or steel pipe 2 of the bending mold, and the moving guide 45 is advanced by the second driving unit 46 to move the stainless or steel of the fixed guide. To support the pipe (2).

In this state, the first bending mold 20 and the first tooth 30 are rotated by 90° by the rotation driving unit 50 so that the stainless or steel pipe 2 is a curved part forming groove of the first bending mold 20 . (21) to perform the first bending process (S1) for right angle bending (see FIG. 7).

In the first bending process, the stainless or steel pipe 2 moves forward by the chuck clamp 10 and the movement guide 45 guides the stainless or steel pipe while moving forward together with the stainless or steel pipe 2 and bending. it will be done

In addition, the stainless or steel pipe 2 is fixed by the first tooth 30 by the non-slip groove 22a formed on the inner periphery of the straight part forming groove 22 of the first bending mold and is rotated while bending. Since it prevents the sliding of the stainless steel or steel pipe when it is done, the bending portion of the stainless or steel pipe 2 is induced to bend in a certain shape, and the bending portion is deformed or the diameter is reduced as in the prior art.

After completing the first bending process in this way, the second bending process S2 is performed.

In the second bending process (S2), the movement guide 45 is retracted and returned to its original position after the first bending process, and the first tooth 30 is also retracted to return to the original position with the first bending mold 20. .

And the stainless or steel pipe 2 is prepared by rotating 180° in the next bending direction by the chuck clamp 10 and moving forward so that the next bending position is located in the first bending mold 20 (see FIG. 8 ).

In this state, the first tooth 30 is again moved forward and rotated upward by the first driving unit 35 to fix the stainless or steel pipe 2 of the bending mold, and the movement guide 45 is moved to the second driving unit Advance by (46) to support the stainless or steel pipe (2) of the fixed guide.

And the first bending mold 20 and the first tooth 30 are rotated 180° by the rotation driving unit 50 so that the stainless or steel pipe 2 is formed into a circular curved part molding groove of the first bending mold 20 . A second bending process (S2) of U-shaped bending by (21) is performed (see FIG. 9).

In the second bending process, the stainless or steel pipe 2 is moved forward by the chuck clamp 10 and the movement guide 45 is moved forward together with the stainless or steel pipe 2 to guide the stainless or steel pipe. Thus, as in the first bending process (S1), the bending portion is deformed or the diameter is reduced and deformed without deformation.

The U-shaped bending by the second bending process (S2) is repeated several times as shown in FIGS. 10 to 13, but the second bending process is performed three times.

After completing the second bending process in this way, a third bending process S3 is performed.

In the third bending process (S3), the movement guide 45 is retracted and returned to its original position after the second bending process, and the first tooth 30 is also retracted to return to the original position with the first bending mold 20. .

And the stainless or steel pipe 2 is prepared by rotating 180° in the next bending direction by the chuck clamp 10 and moving forward so that the next bending position is located in the first bending mold 20 (see FIG. 14 ).

In this state, the first tooth 30 is again moved forward and rotated upward by the first driving unit 35 to fix the stainless or steel pipe 2 of the bending mold, and the movement guide 45 is moved to the second driving unit After advancing by 46 to support the stainless or steel pipe 2 of the fixed guide, the first bending mold 20 and the first tooth 30 are rotated by 90° by the rotation drive unit 50 to Alternatively, the third bending process (S3) in which the steel pipe 2 is bent at a right angle by the circular curved part forming groove 21 of the first bending mold 20 is performed (see FIG. 15 ).

After completing the third bending process in this way, a fourth bending process S4 is performed.

In the fourth bending process (S4), the stainless or steel pipe 2 is separated from the first bending mold part 100, and the chuck clamp 10 faces the U-shaped bending portion of the stainless or steel pipe vertically 90° Rotate and then move up and down.

And as shown in FIG. 4, by inverting the mold die 300 in which the first bending mold part 100 and the second bending mold part 200 are installed up and down, the second bending mold part 200 is positioned upwards. make it

In this state, the chuck clamp 10 lowers the stainless or steel pipe 2 to the second bending mold part 200 .

At this time, the second bending mold part 200 includes a second bending mold 20 ′ in which a circular curved part molding groove 21 and a straight part molding groove 22 are formed on the outside in the same way as the first bending mold, and A second tooth 30 ′ is provided for fixing the stainless or steel pipe 2 in the straight part forming groove 22 of the bending mold by moving back and forth by the third driving unit 38 from the side of the second bending mold 20 . Thus, the tip of the stainless or steel pipe 2 advances between the second bending mold 20' and the second tooth 30' to fix the stainless steel or steel pipe 2 ( 16).

At this time, the movement guider 47 moves forward by the fourth driving unit 48 behind the second bending mold to guide the forward movement of the stainless steel or steel pipe 2 .

In this state, the chuck clamp 10 releases the stainless or steel pipe 2, and the bending mold 20' and the second tooth 30' are rotated 90° by the rotation driving unit 40 to perform right-angle bending. A fourth bending process (S4) is performed (refer to FIG. 17).

Then, the second bending mold 20' and the second tooth 30' are spaced apart, and the refrigerant pipe 2' on which the bending process is completed is unfixed and extracted.

As shown in FIGS. 18 and 19 by automatically bending the stainless or steel pipe by the first, second, third, and fourth bending processes, the X-axis bending parts 2a, 2b and the Z-axis bending part 2c ) will be integrally molded in three dimensions.

The refrigerant pipe (2') of the present invention is manufactured by bending integrally compared to the structure of connecting and assembling by a coupler after partial bending molding as in the conventional product of FIG. 1 , thereby simplifying the manufacturing process and reducing manufacturing cost and manufacturing time it will be done

Moreover, the refrigerant pipe 2' is formed without deformation such that the bending portion is deformed or the diameter is reduced while bending without heat treatment, so that the bending quality of the refrigerant pipe is excellently improved.

In addition, the refrigerant pipe (2') is formed by close-bending so that the distance between the pipes of the Z-axis bending part (2c) is 2.5d or less compared to the pipe diameter (d) as in FIGS. 20 and 21, so a large-capacity semiconductor ( In the heat sink 400 of the rectifier to which the bridge diode, IGDT) is attached, the circulation interval of the refrigerant is integrally buried or inserted in the inside of the plate-shaped body 410 and the inside of the vertical panel part 415 on one side of the upper part of the plate-shaped body. This narrow formation further maximizes the cooling efficiency of the semiconductor.

The refrigerant pipe 2' circulates lubricating oil, oil, liquid gas, and the like to perform a cooling action, and a diameter d of 12 to 16 mm and a thickness of 0.8 to 1.5 mm may be used.

2: Stainless or steel pipe 10: Chuck clamp
20, 20': first and second bending mold 21: curved part molding groove
22: straight part forming groove 22a: non-slip groove
35: first driving unit 28: third driving unit
30,30': first and second teeth 40: fixed guide
41: guide home 45: moving guide
46: second driving unit 50: rotation driving unit
100: first bending mold part 200: second bending mold part
300: die die

Claims (6)

The main body 410 in the heat sink 400 of the rectifier to which the semiconductor is attached, including an X-axis bending part 2a, a Y-axis bending part 2b, and a Z-axis bending part 2c bent in a U shape. ) as a method for bending a refrigerant pipe (2') for a heat sink installed in the interior,
After the stainless or steel pipe (2) is mounted on the chuck clamp (10) that can control rotational movement along with forward, left, and vertical movement, the first bending mold part (100) rotates 90° while moving forward to rotate the stainless or steel pipe (2) a first bending process of perpendicular bending (S1);
The chuck clamp 10 rotates the stainless or steel pipe 2 by 180° and moves it to the next bending position, and then moves forward again while the first bending mold part 100 rotates 180° to rotate the stainless or steel pipe (2) a second bending process of U-shaped bending (S2);
After repeating the second bending process (S2), the chuck clamp 10 rotates the stainless or steel pipe 2 by 180° and moves it to the next bending position, and then moves forward again while the first bending mold part 100 is A third bending process (S3) of 90° rotation to bend the stainless or steel pipe (2) at a right angle; and
The chuck clamp 10 lifts the stainless or steel pipe 2 away from the first bending mold part 100, and then the first bending mold part 100 and the second bending mold part 200 are installed up and down. Invert the mold die 300 up and down, and lower the stainless or steel pipe 2 to the second bending mold part 200, 90° so that the U-shaped bending portion of the stainless or steel pipe 2 is positioned up and down A fourth bending process (S4) in which the second bending mold part 200 rotates 90° and bends at a right angle after rotation and moving to the next bending position (S4);
In the first bending mold part 100, a first bending mold 20 having a circular curved part molding groove 21 and a straight part molding groove 22 formed on the outside, and the first bending mold 20 from the side The first tooth 30 for fixing the stainless or steel pipe 2 in the straight part forming groove 22 of the bending mold by moving back and forth and rotating up and down by the first driving unit 35 is rotated by the rotation driving unit 50 to run,
A stainless or steel pipe ( 2) but the first bending mold 20 and the first tooth 30 are rotated by the rotation driving unit 50 while the moving guide 45 moves forward together with the stainless steel or steel pipe to move the stainless or steel pipe to band,
In the second bending mold part 200, a second bending mold 20' in which a circular curved part molding groove 21 and a straight part molding groove 22 are formed on the outside, and a third from the side of the second bending mold The second tooth 30 ′ for fixing the stainless steel or steel pipe 2 in the straight part forming groove 22 of the bending mold by moving back and forth by the driving unit 38 is rotationally driven by the rotation driving unit 50 so that the stainless steel or by bending the steel pipe,
The X-axis bending part 2a, the Y-axis bending part 2b and the Z-axis bending part 2c are integrally formed, and the interval between the pipes of the Z-axis bending part 2c is 2.5 of the pipe diameter (d). Refrigerant pipe bending molding method for a heat sink, characterized in that the bending is less than double.
According to claim 1,
In the straight part forming groove 22 of the bending mold, an anti-slip groove 22a is formed on the inner periphery to fix the stainless or steel pipe 2 by the teeth 30 and rotate while bending the stainless or steel pipe. Refrigerant pipe bending molding method for a heat sink, characterized in that it is manufactured to prevent slipping.
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