JP2811517B2 - How to assemble the radiation fin to the pipe - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for assembling a plurality of plate-shaped radiating fins to a pipe such as a heat pipe at regular intervals and fixing the radiating fins to the pipe.
The work of assembling the radiation fins to the pipe can be completely automated to improve the efficiency of the work and enhance the fitting strength.

[0002]

2. Description of the Related Art In order to fix radiating fins to pipes for various uses, radiating fins (hereinafter simply referred to as "fins") are loosely fitted to the pipes, and are positioned at a constant pitch with respect to the pipes. In order to fix the fin to the pipe by pushing the expansion plug into the pipe to expand the pipe, the fin is weakly press-fitted to the pipe, positioned at a constant pitch to the pipe, and the inner circumference of the fin and the pipe The fins are firmly press-fitted into the pipe, positioned at a fixed pitch to the pipe, and the fins are fixed by the frictional force of the fitting part. There are many methods such as a method of fixing to a pipe, and these fixing methods are selectively adopted according to the purpose. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for assembling a fin to a pipe in a method in which a fin is strongly press-fitted into a pipe, positioned at a constant pitch with respect to the pipe, and fixed by a frictional force of a fitting portion. In order to improve the thermal conductivity between the pipe and the fin, a flange is provided on the inner periphery of the fin, and this flange is fitted to the pipe to increase the contact area between the fin and the pipe. Is strongly press-fitted into the pipe, the fin is fixed at a constant pitch to the pipe, and the fin is fixed by the frictional force of the fitting portion. It is common to provide a flange on the inner periphery of the fin to facilitate making the angle to the pipe a right angle. A conventional method of assembling a fin to a pipe for positioning the fin at a constant pitch with respect to the pipe and fixing the fin by a frictional force of a fitting portion will be described with reference to FIGS. . For example,
One example of a heat pipe fin has a diameter of 80 mm,
It is a thin disk made of aluminum having a thickness of 0 or 4 mm, and has a center hole at its center. A cylindrical flange f is projected along the center hole at a right angle to the side surface of the fin, and the outer periphery of the pipe is elastically gripped by the fin to facilitate fitting to the pipe. The cylindrical flange f is tapered at a small angle so as to absorb the difference in thermal expansion between the pipe and the fin, and the inside diameter d at the tip is made slightly smaller than the outside diameter D of the pipe. . The fin F is moved in the direction of arrow A to press-fit the pipe H while expanding the cylindrical flange f, and is fixed to the pipe H by the frictional force of the fitting surface. The assembly is done by hand using a tool T with the central bore T _1. Further, since this assembling operation is a manual operation, there is a limit in the strength of the press-fitting of the cylindrical flange f, and the angle (right angle) of the fin F with respect to the pipe H can always be made exactly right. In addition, the accuracy of the pitch P between the fins F, F is not only limited, but also is very inefficient because it is a simple operation by hand. Under such circumstances, in order to reduce the cost and improve the quality of the product, it has been desired to automate the work of attaching the radiation fins.

[0003]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and completely automates the assembly of a radiation fin to a pipe. The pitch between the fitted fins is made highly accurate, that is, by controlling the stroke of the pushing operation, the pushing position of the fins and the pitch between the fins are accurately defined, and the work efficiency is improved. It is an object of the invention to enhance the fitting strength.

[0004]

Means for Solving the Problems Regarding the first invention, means taken to solve the above-mentioned problem is a pipe of a radiating fin in which a number of radiating fins are press-fitted and fixed at fixed intervals to various pipes. It is composed of the following elements (a), (b), and (c) on the premise of an assembling method. (B) driving a movable table having a fin holding device, which is slidable in an axial direction of a pipe fixed to a fixed base, by an electric motor, and controlling the electric motor by an automatic control device; Each stroke of the movable table is detected, and the pushing stroke of the movable table is determined as S ₁ -P (n-
In the case of 1), the electric motor is stopped by the automatic control device. (C) The cylindrical flange of the radiating fin held by the fin holding device is press-fitted to the pipe, and the radiating fin is spaced at a predetermined interval. In the above pipes. However, S ₁ is predetermined stroke of the pushing operation of the first fin, P is the pitch between the heat radiation fins, n represents means n th fins.

[0005]

[Operation] When one fin F is mounted and held on the fin holding device of the movable table and the electric motor is started,
The stroke detection device detects that the movable table has moved forward by the _first predetermined stroke S1, at which point the electric motor stops, the movable table stops at that position, and then the motor reversely rotates and moves. Return the table to the standby position. As a result, the first fin F held by the fin holding device 2 is firmly press-fitted into the pipe H and is fixed with sufficient strength. Since a fixed position relative to the pipe H of the first fin F is determined by the initial values S ₁ stroke detecting device 20 is set in advance, the control is performed with high precision microcomputer control. When the first pressing operation is completed, 2 is input to n of (n-1). Then, P is from those set in the control device as the pitch between the fins, required stroke S ₂ of the next pushing operation, automatically when 2 is input to the n of the (n-1) Is set. Later the first second fin is attached to the fin holding device, when the start switch is on again, the electric motor is started again, pushing the movable table by a predetermined stroke S _2. When that this push stroke reaches a predetermined value S ₂ is detected by the stroke detector, the electric motor is stopped by the automatic control system, followed by the movable table is returned to the standby position. Stroke _{S 2} of the second round of pushing operation the _S 1 -P
× 1, and the second fin is fitted and fixed exactly at a position one pitch behind the first fin. At this point, the counter counts n: 3, and n of (n-1)
Is set to _3, the required stroke S3 of the third fin pushing operation is automatically set. Later the third fin is attached to the fin holding device 2, when the start switch is on again, to advance the movable table, the electric motor is stopped at the time the stroke has reached the required value S ₃ of the Thereafter, the movable table is returned to the standby position. The stroke of the third pushing operation is S ₁ -P × 2, and the third fin is fitted and fixed at a position exactly two pitches behind the first fin. By repeating the above operations, a large number of fins can be automatically assembled at a predetermined interval (pitch) at right angles to the pipe and with sufficient fitting strength.

[0006]

[Embodiment] An embodiment of the present invention will be described with reference to FIGS. A fin holding device 2 is mounted on the front surface of a movable table 1 which is guided by left and right guide rails R of a support B and is slidable in the direction of arrow XX '(front-back direction). There is a pipe fixing base 3, on which a pipe H is detachably fixed. Further, a stopper 4 for pressing the rear end of the pipe H is fixed so that its position in the front-rear direction can be adjusted. The pipe fixing base 3 has an appropriate clamp device such as a holding screw and a toggle mechanism,
Thereby, the pipe H can be firmly fixed. The movable table 1 has an electric motor M, whereby the movable table 1 is driven in the front-rear direction via a drive mechanism such as an appropriate reduction gear transmission and a feed screw mechanism. The fin holding device 2 fixes a fin holding plate 5 having a center hole 6 to a mounting plate 2-1.
The fin F is fixed to the support plate 8 by the support bolts 7 and has a circular recess 9 on the front surface of the fin holding plate 5 for fitting and holding the fin F. The edge of the recess 9 has a fin F Is formed in a taper 11 in order to facilitate the fitting into the recess 9. The size of the center hole 6 is such that the cylindrical flange f of the fin F is loosely fitted. With the fin F fitted and held in the circular recess 9 of the fin holding plate 5, the electric motor M is started by the control device to move the movable table 1 via a transmission mechanism such as a reduction gear transmission and a feed screw mechanism. Move forward (arrow X direction). By the forward movement of the movable table 1, the cylindrical flange f of the fin F held by the fin holding board 5 is press-fitted into the pipe H. When the fin F is pushed to the position programmed in advance by the control device, the electric motor M automatically stops, and then the movable table automatically retracts (in the direction of the arrow X ') and returns to the illustrated standby position. This operation is sequentially repeated, and a large number of fins F are sequentially fitted and fixed to the pipe H at a constant interval P. The above-mentioned electric motor M may be a normal electric motor, and the required stroke is S ₁ −P × for each forward movement of the movable table by the control device.
It is defined according to (n-1). When the optical stroke detection device 20 provided on the front surface of the pipe fixing base 3 detects that the forward movement stroke has reached a predetermined value, the electric motor is stopped by the automatic control device at that time, and then the movable table 1 is stopped. Is returned to the standby position and stopped. For example, assuming that a required stroke S ₁ = L for assembling the _first fin F ₁ to the pipe H, this value is set as an initial condition in the control device. The first forward operation is started, and when the stroke reaches L and is detected by the optical stroke detection device 20, the electric motor M stops, and then the return operation is performed. Thereafter, (n-1) is input, and the stroke of the next operation is set in the automatic control device. 2.5m pitch between fins
if it is m, the stroke S ₂ for the second round of forward motion is the L-2.5 × 1. When the second-time operation is completed, the required stroke S ₃ for the third round of forward movement at that time is set to L-2.5 × 2 in the same manner. The optical stroke detecting device may be any conventionally known optical stroke detecting device as long as it has a high accuracy. The stroke may be detected by subtracting the distance measurement value from the initial value between the front surface of the board 2 and the arithmetic circuit.

[0007]

[Effect] There is no known method of mounting the radiation fins on the pipe, in which a large number of disc-shaped radiation fins are sequentially fitted and fixed to the pipe at regular intervals, the above-mentioned problems being solved. Therefore, solving this problem and solving the above-mentioned problem in the prior art itself is a unique effect of the present invention. Also, a large number of radiating fins can be automatically assembled to the pipe at regular intervals, and the efficiency of this assembling operation can be significantly improved. Furthermore, the fitting strength between the pipe and the radiating fin can be improved by mechanically press-fitting the cylindrical flange defining the center hole of the radiating fin into the pipe, and therefore, the fitting that repeats expansion and contraction can be achieved. Intrusion of foreign matter into the surface is prevented for a long time, and corrosion of the fitting surface is prevented from progressing due to intrusion of the foreign matter, so that the durability can be improved. Furthermore, since the fitting contact area between the pipe and the cylindrical flange of the radiation fin is increased, the thermal conductivity between the pipe and the fin can be improved accordingly. These are great effects of the present invention.

[Brief description of the drawings]

FIG. 1 is a perspective view of an embodiment of the present invention.

FIG. 2 is a partial sectional view of a fin holding plate.

FIG. 3 is a perspective view of a conventional technique.

FIG. 4 is a cross-sectional view showing a fitted state of the pipe and the radiation fin.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Movable table 2 ... Fin holding device 2-1 ... Mounting plate 3 ... Pipe fixing stand 4 ... Stopper 5 ... Fin holding board 6 ... Center hole 7 ... Support bolt 8 ... Support plate 9 ... Circular recess 11 ... Taper 20 ... Optical stroke detection device B ... Support base R ... Guide rail F ... Fin f ... Cylindrical flange M: Electric motor D: Outer diameter of pipe d: Inner diameter of tip of flange f T: Tool H: Pipe P: Spacing (pitch)

──────────────────────────────────────────────────続 き Continuation of the front page (58) Field surveyed (Int. Cl. ⁶ , DB name) B23P 21/00 301 B21D 53/08 B23P 19/02

Claims (1)

(57) [Claims] 1. A method for assembling a heat dissipating fin to a pipe in which a large number of heat dissipating fins are press-fitted and fixed at fixed intervals to various pipes. Then, a movable table having a fin holding device is driven by an electric motor, the electric motor is controlled by an automatic control device, each stroke of the movable table is detected, and the pushing stroke of the movable table is S ₁ -P (n In the case of -1), the electric motor is stopped by the automatic control device, the cylindrical flange of the radiating fin held by the fin holding device is press-fitted into the pipe, and the radiating fin is spaced at a predetermined interval. A method for assembling the radiating fins to the pipe, wherein the fins are sequentially assembled to the pipe. However,
S ₁ is a predetermined stroke of the pushing operation of the first fin, P is the pitch between the radiation fins, and n is the n-th fin.