JPH04289017A - Method for cutting corrugated fin - Google Patents

Abstract

PURPOSE:To shorten cutting off period and improve productivity by cutting off corrugated fin without stopping its run. CONSTITUTION:A servo motor 71, a cam 72 driven by rotation of the servo motor, and a cutting blade 73 reciprocatingly running in parallel with the running direction of corrugated fin are provided. Further, the position of the cutting blade 73 is conformed to the vicinity of a fin top part to be the cutting off position, by changing rotating speed of the servo motor 71, or by moving the running commencement position of the cutting blade 73, against the running speed of the corrugated fin 5 varied due to fin pitch. In the condition holding the relative position, the cutting blade 73 is run in parallel at the same speed as the running speed of the corrugated fin 5 to cut off the corrugated fin 5.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for cutting corrugated fins used in heat exchangers and the like.

0002

[Prior art] Figure 3 shows the conventional processing and processing of corrugated fins.
FIG. 3 is a front view of the cutting device. The corrugate fin processing/cutting device consists of a processing section 1, an accumulating section 2, and a cutting section 3. As the aluminum strip-shaped fin material 4 passes through the corrugated cutter 11 in the processing section 1, its surface is cut and raised to form a large number of louvers 5a as shown in FIG. It is bent into a shape and then sent by a feed roll 12 to a shrink roll 13, where it is shrunk so that the fin pitch P (FIG. 4) becomes dense. Next, in the process of passing through the variable pitch roller 14, the fin pitch P is adjusted to a predetermined value, thereby completing the corrugated fin 5.

The corrugated fin 5 is driven forward through the accumulating section 2 via the fin feeding worm 31 of the cutting section 3, and when it travels a predetermined number of fin pitches, that is, as will be described later, the corrugated fin 5 moves forward through the accumulating section 2. When the accumulated amount of corrugated fins 5 reaches a predetermined amount, the fin feeding worm 31 is stopped and the cutting blade 32 cuts the corrugated fins 5 at the fin top 5b position. While the corrugated fins 5 are stopped from traveling by stopping the fin feeding worm 31, the corrugated fins 5 processed in the processing section 1 are accumulated in the accumulating section 2.

Next, when the corrugated fins 5 are cut, the fin feeding worm 31 is driven again to send out the corrugated fins 5 accumulated in the accumulating section 2, and when the accumulated amount reaches zero, the fin feeding worm 31 is driven again. It stops again and cuts with the cutting blade 32. That is, the processing speed of the corrugated fins 5 is adjusted so that a predetermined number of fin pitches are processed during this cutting cycle. By repeating this process, the corrugated fins 5 are cut one after another.

[0005]

[Problems to be Solved by the Invention] In the conventional corrugate fin cutting method described above, since the corrugate fins 5 are cut after stopping their running, the corrugate fins 5 accumulated in the accumulating section 2 during this stop are removed. It takes time to send out the corrugated fins, and the time until the subsequent cutting of the corrugated fins 5, that is, the cutting cycle becomes longer, and as a result, the machining speed of the corrugated fins 5 cannot be increased, and its productivity cannot be improved. I couldn't.

An object of the present invention is to eliminate the above-mentioned drawbacks of the prior art and shorten the cutting cycle by cutting the corrugated fins without stopping the running of the corrugated fins.

[0007]

[Means for Solving the Problems] The present invention has solved the above problems, and includes a servo motor, a cam that follows the rotation of the servo motor, and a cam that is guided by the cam to move the corrugated fin in the running direction. A cutting tool is provided with a cutting blade that reciprocates in parallel with the fin, and the number of revolutions of the servo motor is varied or the starting position of the cutting blade is adjusted in response to the running speed of the corrugated fin, which changes depending on the fin pitch. By moving the cutting blade, the position of the cutting blade is matched with the vicinity of the top of the corrugated fin, which is the cutting position of the corrugated fin, and the cutting blade is moved in parallel at the same speed as the running speed of the corrugated fin while maintaining the relative position. The present invention relates to a method for cutting corrugated fins, which is characterized in that the corrugated fins are cut by cutting the corrugated fins.

[0008]

[Operation] In the present invention, the cutting blade is guided by a cam driven by the rotation of the servo motor and runs parallel to the running direction of the corrugated fin. And in response to the running speed that changes depending on the fin pitch of the corrugated fin,
By changing the starting rotation speed at the start of the servo motor, you can adjust the starting speed of the cutting blade,
Alternatively, by moving the installation position of the cutting tool, etc., the travel start position of the cutting blade can be adjusted to position the cutting blade near the top of the fin, which is the cutting position of the corrugated fin, and this position can be maintained. By adjusting the rotational speed of the servo motor at this point, the running speed of the cutting blade and the running speed of the corrugated fin can be synchronized. Therefore, even when corrugated fins are processed with various fin pitches, the corrugated fin can be cut near the top of the fin while the cutting blade runs parallel to the corrugated fin at the same traveling speed. As a result, since the corrugated fins do not stop running, the cutting cycle is shortened.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a front view of a cutting tool installed in a corrugated fin processing and cutting apparatus according to an embodiment of the present invention. The cutting tool 7 includes a servo motor 71, a drum cam 72, and a cutting blade 73, and is placed on a base 75 via a support piece 74. Note that the cutting tool 7 may be configured to be able to move its installation position as appropriate. The servo motor 71 is started and stopped by inputting a signal from an encoder (not shown) that counts the number of fin pitches of the corrugated fins 5, and is also capable of increasing or decreasing its rotation speed. A drum cam 72 connected to the servo motor 71 has a guide groove 72a formed on its outer circumferential surface, and by guiding the cutting blade 73 through the guide groove 72a, the cutting blade 73 is reciprocated in parallel to the running direction of the corrugated fin 5. It is designed to run. Further, the guide groove 72a is formed so that when the drum cam 72 is driven at a constant rotation speed via the servo motor 71, a section in which the cutting blade 73 reciprocates at a constant speed can be secured. The cutting blade 73 is the main blade 73a
and a secondary blade 73b, and the corrugated fin 5 is cut by pushing the main blade 73a upward. Therefore, in order to cut the corrugated fins 5 smoothly, it is desirable to cut the fins near the tops 5b. Note that in FIG. 1, the same reference numerals are given to the members corresponding to those in FIG. 3 shown in the conventional example, and the explanation thereof will be omitted.

In the above apparatus, the corrugated fins 5 processed in the processing section 1 are driven forward via the fin feeding worm 31. Note that this may be driven forward only via the variable pitch roller 14 without using the fin feeding worm. During this traveling process, the number of fin pitches of the corrugated fins 5 is counted by an encoder or the like (not shown), and when this reaches a predetermined number, the signal is output to the servo motor 71, which starts the servo motor 71 and transmits the signal via the drum cam 72. The cutting blade 73 reciprocates. Here, since the running speed (or processing speed) of the corrugated fins 5 differs depending on the size of the fin pitch P, the rising speed of the servo motor 71 is changed accordingly to adjust the rising speed of the cutting blade 73. As a result, the cutting blade 73 is positioned near the fin top portion 5b of the corrugated fin 5.

FIG. 2 is an explanatory diagram of the fin running speed. If the fin pitch P is small, the running speed of the corrugated fins 5A will be slow, so as shown by the solid line in FIG.
The rising speed of A is changed from point A to point B, and the cutting blade 73A is positioned at point B so as to face the fin top portion 5b, which is the cutting point of the corrugated fin 5A. On the other hand, if the fin pitch P is large, the corrugated fin 5B
Since the traveling speed of the corrugated fin 5B increases, the rising speed of the cutting blade 73B is changed from point A to point D, as shown by the broken line in FIG. It is positioned so as to face the fin top portion 5b. Subsequently, the rotation speed of the servo motor 71 is adjusted in accordance with the running speed of the corrugated fins 5, and the cutting blade 73 is caused to run parallel to the running speed of the corrugated fins 5 while maintaining the state located at the fin top portion 5b. . That is, in FIG. 2, the cutting blade 73A is made to match the running speed A of the corrugated fin 5A from point B to point C, and the cutting blade 73B is made to match the running speed A of the corrugated fin 5B from point 2 to point H. is matched to

Next, each of the corrugated fins 5A and 5B is cut by the cutting blades 73A and 73B at the position of the fin top 5b while the cutting blades 73A and 73B run in parallel. When the corrugated fins 5A and 5B are cut, the cutting blades 73A and 73B cut into the guide groove 7 of the drum cam 72.
2a, the cutting blades 73A and 73B
When the servo motor 71 is returned to the travel starting point, that is, point A, the servo motor 71 is stopped, and the travel is made to stand by until a signal from the encoder is input. Thereafter, the same process as described above is repeated, and the corrugated fins 5 are cut one after another.

In this example, the cutting blade 73 is positioned at the fin top portion 5b of the corrugated fin 5 by changing the starting rotation speed of the servo motor 71 and adjusting the starting speed of the cutting blade 73. However, by moving and adjusting the installation position of the cutting tool 7 in accordance with the traveling speed of the corrugated fin 5, the traveling start position of the cutting blade 73 can be changed, and the cutting blade 73 can be positioned at the fin top portion 5b. .

As described in detail above, in this embodiment, the corrugated fin 5 can be cut without stopping its running, so that the cutting cycle can be shortened. Also, when processing and producing corrugated fins 5 with different fin pitches, the servo motor 71
The corrugated fin 5 can be cut while traveling by varying the rotation speed of the cutting blade 73 or moving the traveling start position of the cutting blade 73.

[0015]

Effects of the Invention The corrugated fin cutting method of the present invention includes a servo motor, a cam driven by the rotation of the servo motor, and a cutting machine that reciprocates parallel to the running direction of the corrugated fin guided by the cam. The cutting tool is equipped with a cutting tool consisting of a blade, and the cutting tool is configured to change the rotational speed of the servo motor or move the starting position of the cutting blade in accordance with the traveling speed of the corrugated fin, which changes depending on the fin pitch. The position of the blade is aligned with the vicinity of the top of the fin, which is the cutting position of the corrugated fin, and the cutting blade is moved in parallel at the same speed as the traveling speed of the corrugated fin while maintaining the relative position to cut the corrugated fin. Therefore, there is no need to stop the movement of the corrugated fin during cutting, and as a result, the cutting cycle can be shortened, and the machining speed of the corrugated fin can be increased to improve productivity. Furthermore, by making the rotational speed of the servo motor variable and the travel start position of the cutting tool variable, it is possible to cope with the case where corrugated fins with different fin pitches are processed.

[Brief explanation of the drawing]

FIG. 1 is a front view of a cutting tool provided in an embodiment of the present invention.

FIG. 2 is an explanatory diagram of fin running speed.

FIG. 3 is a front view of a conventional corrugated fin processing/cutting device.

FIG. 4 is a perspective view of a corrugated fin.

[Explanation of symbols]

5 Corrugated fin 5b Fin top 71 Servo motor 72 Drum cam 72a Guide groove 73 Cutting blade 73a Main blade 73b Secondary blade

Claims (1)

[Claims] 1. A cutting tool comprising a servo motor, a cam driven by the rotation of the servo motor, and a cutting blade guided by the cam and reciprocating in parallel to the running direction of the corrugated fin, The position of the cutting blade is adjusted to cut the corrugated fin by changing the rotation speed of the servo motor or by moving the starting position of the cutting blade in accordance with the running speed of the corrugated fin, which changes depending on the pitch. The corrugated fin is cut by aligning the cutting blade with the vicinity of the top of the fin, which is the position, and running the cutting blade in parallel at the same speed as the traveling speed of the corrugated fin while maintaining the relative position. Cutting method.