JP2002329820A - Method of manufacturing heat conducting body with fin - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method of manufacturing a heat conducting body which can secure a sufficiently large heat conducting surface area by reducing the overhung amounts of bent fins and increasing the number of formed fins per prescribed length of the heat conduction body and, at the same time, can be reduced in ventilation resistance to ventilated air and does not cause fluctuation in the quality, such as the thicknesses, heights, etc., of the formed fins. SOLUTION: The fins 3 are formed by skiving the heat conducting body 20 by means of a cutting tool 20 having an included angle α of 40-55 deg. in a state where the cutting incident angle θ of the tool 20 to the surface of the body 2 is set at 4.5-9.5 deg..

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a finned heat transfer member used as a cooling fin of a control unit (semiconductor or the like) of a device such as a personal computer or an industrial device or a radiation fin in a Peltier device. .

[0002]

2. Description of the Related Art Conventionally, a heat transfer fin as shown in FIG. 3 (b) has been obtained by performing skive cutting in which the surface of a metal heat transfer plate is thinly cut with a cutting tool such as a cutting tool. The (100) surface is provided with a large number of fins (101) extending outward in a curved shape.
Since the fin height and the fin pitch of such a fin can be freely set as compared with the radiation fin made of an extruded material, the heat transfer performance of the fin can be improved.

[0003]

However, the fin (101) formed by the skive cutting is
As shown in FIG. 3 (b), since the fin is greatly curved and the overhang amount (Fx) is large, the space occupancy per fin is large, and therefore, the predetermined length of the heat transfer plate (100) ( L), the number of fins that can be formed is limited, that is, it is difficult to increase the number of fins. Therefore, the heat transfer surface area cannot be increased, and the heat transfer performance cannot be further improved. Further, since the fin (101) is greatly curved, the airflow resistance to air blown almost perpendicularly to the surface of the heat transfer plate becomes relatively large. A large space (A) that does not contribute to heat exchange is formed (see FIG. 3B),
Since air escapes from the space (A), there is a problem that it is difficult to improve the heat transfer performance.

In order to solve these problems, it is necessary to reduce the overhang amount (Fx) of the fin (101). Then, the present inventor tried to manufacture the fin (101) by setting the rising angle (H) of the fin (101) so as to be large. Fin thickness before cutting (s)
inθ × Fp) and the fin thickness after cutting (Ft), causing a large variation, and the thickness of the formed fin,
It has been found that the quality such as the fin height is not stable and cannot be provided as a product at all. That is, it was found that the problem could not be solved simply by setting the cutting edge angle (α) and the cutting incident angle (θ) of the cutting tool to be large so that the rising angle (H) of the fin became large (see FIG. 2). .

The present invention has been made in view of such technical background, and can reduce the amount of protrusion of a skived curved fin and increase the number of fins formed per predetermined length of a heat transfer body. The heat transfer surface area of the finned heat transfer body can be sufficiently secured, the airflow resistance to the blown air can be reduced, and the quality of the formed fins, such as thickness and height, does not vary. It is intended to provide a manufacturing method.

[0006]

The inventor of the present invention has conducted intensive studies on a manufacturing method capable of reducing the amount of overhang of the curved fin and not causing variations in the thickness and height of the fin. The inventors have found that the above-mentioned object can be achieved by performing skive cutting with the cutting edge angle and the cutting incidence angle of the cutting tool defined in specific ranges, respectively, and have completed the present invention.

That is, according to the method of manufacturing a finned heat transfer body of the present invention, the surface of a heat transfer body such as a metal heat transfer plate is skived by thinning with a tool, so that the surface is outwardly exposed. In the method for manufacturing a finned heat transfer body provided with a large number of fins extending in a curved shape toward the heat transfer body, a tool having a blade edge angle in a range of 40 ° to 55 ° is used as the tool. 4.5 ° to 9.5 cutting incident angle
It is characterized in that skive cutting is performed in a state set to °.

Since a cutting tool having a cutting edge angle of 40 ° to 55 ° is used, the amount of protrusion of the curved fin can be reduced, and variations in quality such as the thickness and height of the fin can be reduced.
Further, the cutting tool is set at 4.5 ° to 9.5 with respect to the heat transfer member surface.
Since skive cutting is performed at an incident angle of °, variations in the thickness of the fins formed can be reduced, high quality can be achieved, and skive cutting can be performed in a stable state. Since the protrusion amount of the fins can be reduced as described above, the number of fins formed per predetermined length of the heat transfer body can be increased, and the heat transfer surface area can be sufficiently secured. In addition, the air flow is uniform at each part, and stable heat transfer performance can be secured. Also, since the amount of protrusion of the fins can be reduced, there is almost no space inside the curved portion of the end fins that does not contribute to heat exchange, thereby further improving the heat transfer performance.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION The manufacturing method according to the present invention is characterized in that a skive cutting process for thinly cutting the surface of a heat transfer body (2) such as a heat transfer plate made of metal such as aluminum with a cutting tool is performed.
A method for manufacturing a finned heat transfer body (1) provided with a large number of fins (3) extending outward in a curved shape on a surface, wherein a cutting edge (α) is 40 ° as a cutting tool (20). ~
The angle of incidence (θ) of the cutting tool (20) with respect to the surface of the heat transfer body (2) is set to 3.
It is characterized in that skive cutting is performed in a state set at 5 ° to 9.5 ° (see FIG. 1).

As the cutting tool (20), one having a cutting edge angle (α) in the range of 40 ° to 55 ° is used. 40 °
If it is less than 1, the cutting edge becomes thin and the cutting edge is liable to break during cutting, and the overhang amount (Fx) of the fin (3) becomes large. When the overhang amount (Fx) increases as described above, the number of fins that can be formed per a predetermined length of the heat transfer body decreases. In a specific example, for example, as shown in comparison with FIG. 3, the overhang amount (Fx) of the fin (101)
3B, the number of fins (101) that can be formed per predetermined length (L) of the heat transfer body (100) is b _{1 to} b ₈ . While the number of the fins is eight, the finned heat transfer element (1) shown in FIG. The number in 3) is a ₁
A nine ~a _9, the number of fins (3) which can be formed per a predetermined length of the heat transfer body (2) is increased.

On the other hand, when the cutting edge angle (α) exceeds 55 °, as shown in FIG. 7, the fin thickness Ft after cutting is reduced by the fin scooping thickness (sin θ × Fp) before cutting (FIG. 1).
In the figure plotted with respect to (b), a linear relationship is not established between the two, that is, the variation from the straight line is large (Fp: fin pitch). In other words, the ratio of Ft to (sin θ × Fp) varies greatly. This means that the thickness of the fin (3) before and after the cutting process has a large variation, which results in a variation in the quality such as the fin height, which cannot be provided as a product at all. On the other hand, when skive cutting is performed using a cutting tool (20) having a cutting edge angle (α) of 40 ° to 55 °, as shown in FIGS. In the figure plotted with respect to (sin θ × Fp), a good linear relationship is established between the two, and fins (3) can be made to have little variation in quality such as thickness and height.

For such a reason, the cutting tool (20) whose cutting edge angle (α) is in the range of 40 ° to 55 ° is used. In particular, the overhang amount (Fx) of the fin (3) is used. Is preferably set in the range of 48 ° to 55 °, more preferably in the range of 49 ° to 54 °, and even more preferably in the range of 50 ° to 53 °. ° range.

In order to minimize variations in quality such as the thickness and height of the fin (3), the cutting edge angle (α)
Is preferably set in the range of 40 ° to 47 °, more preferably in the range of 41 ° to 46 °, and still more preferably in the range of 42 ° to 45 °.

The overhang amount (Fx) of the fin (3)
From the viewpoint of reducing both the variation in the quality of the fins (3) and the balance, the cutting edge angle (α) is 43 ° to 52 °.
° is preferably set, more preferably 45
° to 50 °, more preferably 46 ° to
The range is 49 °.

In the manufacturing method of the present invention, the cutting incident angle (rake angle) (θ) of the cutting tool (20) with respect to the surface of the heat transfer body (2) is set to 4.5 ° to 9.5 °. . Below 4.5 ° the fins (3) formed
When the thickness exceeds 9.5 °, the fin thickness becomes large, making it difficult to form a thin fin having a thickness of, for example, about 0.2 mm. In a stable state. Above all, the cutting incidence angle (θ) of the cutting tool is 5 ° to 9 °.
Is preferably set to 6 °, particularly preferably 6 ° to 8 °.
°.

[0016]

Next, specific examples of the present invention will be described in comparison with comparative examples.

Example 1 A heat transfer plate with aluminum fins as shown in FIG. 3A was manufactured based on the manufacturing method of the present invention. That is, skive cutting was performed using a cutting tool having a cutting edge angle (α) of 40 ° and a cutting incident angle (θ) of 7 °. The fin pitch (F
p) was set to 2.0 mm. The size of this heat transfer plate is
The heat transfer plate had a width of 80 mm, a length of 100 mm, and a thickness of 5 mm. Fins having a height of 30 mm were protruded in a curved shape on one surface of the heat transfer plate. The number of fins formed was 48.

<Example 2> A heat transfer plate with fins was manufactured by performing skive cutting in the same manner as in Example 1 except that a cutting tool having a blade edge angle (α) of 43 ° was used. The number of fins formed was 48.

<Example 3> A heat transfer plate with fins was manufactured by skive cutting in the same manner as in Example 1 except that a cutting tool having a blade edge angle (α) of 45 ° was used. The number of fins that could be formed was 49.

<Embodiment 4> Skive cutting was performed in the same manner as in Embodiment 1 except that a cutting tool having a cutting edge angle (α) of 47 ° was used and the cutting incident angle (θ) was set to 6.5 °. To produce a finned heat transfer plate. The number of fins that can be formed is 4
There were nine.

<Embodiment 5> Skive cutting was performed in the same manner as in Embodiment 1 except that a cutting tool having a cutting edge angle (α) of 50 ° was used and the cutting incidence angle (θ) was set to 7.5 °. To produce a finned heat transfer plate. The number of fins that can be formed is 4
There were nine.

<Sixth Embodiment> Skive cutting is performed in the same manner as in the first embodiment except that a cutting tool having a cutting edge angle (α) of 55 ° is used and a cutting incident angle (θ) is set to 7.2 °. To produce a finned heat transfer plate. The number of fins that can be formed is 4
There were eight.

The finned heat transfer plates of Examples 1 to 6 all had small variations in quality such as fin thickness and height.

Comparative Example 1 A heat transfer plate with fins was produced by skive cutting in the same manner as in Example 1 except that a cutting tool having a cutting edge angle (α) of 37 ° was used. The number of fins that could be formed was 46.

Comparative Example 2 A finned heat transfer plate was produced by skive cutting in the same manner as in Example 1 except that a cutting tool having a blade edge angle (α) of 60 ° was used. This heat transfer plate had a large variation in the thickness and height of the fins and could not be provided as a product.

The finned heat transfer bodies of Examples 1 to 6 can increase the number of fins formed per predetermined length (with the same fin thickness and the same fin pitch) as compared with the conventional product of Comparative Example 1; Thereby, it was recognized that the heat transfer performance was improved by about 8% as compared with the conventional product of Comparative Example 1. That is, the finned heat transfer bodies of Examples 1 to 6 had improved heat transfer performance by about 8% compared with the same volume (same space volume).

[0027]

According to the manufacturing method of the present invention, the cutting edge angle is 40
Since skive cutting is performed using a cutting tool at an angle of 55 ° to 55 °, the amount of protrusion of the curved fins can be reduced, and variations in quality such as the thickness and height of the fins can be reduced. In this way, since the amount of protrusion of the fins can be reduced, the number of fins formed per predetermined length of the heat transfer body can be increased, the heat transfer surface area can be sufficiently secured, and excellent heat transfer performance can be obtained. The airflow resistance to the blown air can be reduced, and furthermore, there is almost no space inside the curved portion of the end fin that does not contribute to heat exchange, so that the heat transfer performance can be further improved. Furthermore, since the skive cutting is performed by causing the cutting tool to enter the heat transfer member at an incident angle of 4.5 ° to 9.5 °, the variation in the thickness of the fins formed can be reduced and a stable state is achieved. Skive cutting can be performed. By defining the cutting edge angle and the cutting incident angle of the cutting tool in the specific ranges as described above, a high-quality and high-performance finned heat transfer body can be manufactured.

[Brief description of the drawings]

FIG. 1 is a schematic explanatory diagram of fin start-up forming by skive cutting.

FIG. 2 is an explanatory diagram showing a correlation among a cutting edge angle, a cutting incidence angle, and a fin rising angle.

FIG. 3A is a side view of a finned heat transfer body manufactured by the manufacturing method of the present invention, and FIG. 3B is a side view of a finned heat transfer body manufactured by a conventional manufacturing method.

FIG. 4 is a diagram plotting a correlation between Ft and (sinθ × Fp), wherein (a) is a measurement diagram at a blade angle α = 40 °
(B) is a measurement diagram at a blade edge angle α = 43 °.

FIG. 5 is a diagram plotting a correlation between Ft and (sin θ × Fp);
(B) is a measurement diagram at a blade edge angle α = 47 °.

FIG. 6 is a diagram plotting a correlation between Ft and (sinθ × Fp);
(B) is a measurement diagram at the blade edge angle α = 55 °.

FIG. 7 is a diagram plotting a correlation between Ft and (sin θ × Fp), and is a measurement diagram at a cutting edge angle α = 60 °.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Heat transfer body with fins 2 ... Heat transfer body 3 ... Fins 20 ... Cutting tool α ... Cutting edge angle θ ... Cutting incident angle H ... Fin rising angle Ft ... Fin thickness Fx ... Overhang amount Fp ... Fin pitch

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Toshiro Koizumi 1-480 Inuzuka, Oyama-shi, Tochigi Prefecture Showa Denko KK Oyama Office F-term (reference) 5F036 AA01 BB06 BD03

Claims (1)

[Claims] 1. A fin having a large number of fins extending outward in a curved shape on a surface thereof by performing skive cutting for thinly cutting the surface of a heat transfer body such as a metal heat transfer plate with a cutting tool. In the method for manufacturing a heat transfer member, the cutting incident angle of the tool with respect to the surface of the heat transfer member is 4.5 ° to 9.5, using a cutting tool having a blade edge angle in a range of 40 ° to 55 °. A method for producing a finned heat transfer body, wherein skive cutting is performed in a state of setting the temperature to 0 °.