JP3305859B2 - Flat tube cutting method and cutting device - 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 cutting a flat tube and an apparatus for cutting the flat tube.

[0002]

2. Description of the Related Art In a flat tube used for forming a heat medium circuit of a cooling and heating apparatus, when a cut portion of the flat tube is cut by a circular saw, burrs and chips are formed on the cut surface. There is a problem that it occurs. Conventionally, in order to solve the above problem, for example, Japanese Patent Laid-Open No. 4-152
A cutting method disclosed in Japanese Patent No. 016 is known. In this case, the flat tube is cut at the cut portion by forming a cut portion on both flat surfaces at the cut portion of the flat tube by a pair of cutting blades, and then pulling the flat tube in the tube direction. It has become.

[0003]

However, as described above, in the method of forming the cut portion at the cut portion of the flat tube by the cut blade, the cutting edge of the cut blade is easily deteriorated, and It took a lot of trouble to replace and replace the blade.

SUMMARY OF THE INVENTION In view of the above-mentioned conventional problems, an object of the present invention is to provide a flat tube cutting method and a flat tube cutting method which can satisfactorily cut a flat tube at a cut portion without using a cutting blade. It is to provide.

[0005]

In order to achieve the above object, a method for cutting a flat tube according to the present invention is directed to a method for cutting a flat tube in a direction orthogonal to a flat surface of the flat tube. By applying a shear load, after forming a plastically deformed fragile portion, of the flat tubes, one flat tube portion bordering the fragile portion is fixed, and the other flat tube portion is pulled. The flat tube is cut at the fragile portion by swinging with the vicinity of the fragile portion as a fulcrum. In addition,
An apparatus for cutting a flat tube according to the invention of claim 2 includes first and second clamping means which are adjacent to each other with a cut portion of the flat tube as a boundary and clamp the flat tube, respectively. A shearing mechanism for displacing the second clamp means in a direction perpendicular to the flat surface of the flat tube and with a displacement amount smaller than the thickness dimension of the flat tube; A tension / swinging mechanism for swinging with the vicinity of the cut portion as a fulcrum while pulling the flat tube portion on the other side while the tube portion is fixed.

[0006]

The flat tube cutting method according to the first aspect of the present invention.
If, after forming the plastically deformed fragile portion by a shear load to the cleavage site of the flat tube, and fixing one of the flat tube portions to border the fragile portion while pulling the other of the flat tube section swings By doing so, it is possible to cut by applying a compressive load and a tensile load alternately while applying a tensile force to the fragile portion. According to the flat tube cutting device according to the invention of claim 2,
After the first and second clamping means are displaced in a direction orthogonal to the flat surface of the flat tube to form a weak portion, the flat tube portion on one side of the weak portion is fixed, and the flat tube portion on the other side is fixed. To
By swinging while pulling by the pulling / swinging mechanism, a compressive load and a tensile load can be applied alternately while applying a tensile force to the fragile portion, and the flat tube can be easily moved at the fragile portion. Can be cut into

[0007]

(Embodiment 1 ) A first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a partially cut-away view of a cutting device for cutting a flat tube 1 made of metal (mainly made of an aluminum alloy) in which a number of passages are defined in the longitudinal direction of the inside at a cut site.
In FIG. 1, first and second clamping means 11 and 21 are provided, respectively, with the cut portion of the flat tube 1 as a boundary.

First clamping means 1 for clamping flat tube portion 2 at one of the cut portions of flat tube 1 (left side in FIG. 1)
1 includes a pair of upper and lower fixed clamp bodies 12 and a movable clamp body 14. As shown in FIG. 2, the fixed clamp body 12 has a clamp surface 13 corresponding to the lower flat surface of the one flat tube portion 2 and is fixed to a machine frame (not shown). The movable clamp body 14 has a clamp surface 15 corresponding to the upper flat surface of the other flat tube portion 3 and is adapted to be clamped and unclamped by a clamp cylinder 16.

Second clamping means 2 for clamping the other flat tube portion 3 (right side in FIG. 1) of the flat tube 1 to be cut.
Reference numeral 1 denotes a lifting base which is raised and lowered by a shearing cylinder 31.
And a pair of upper and lower clamp bodies 22 and 24 that are assembled to the screw 32 via a slide board 35. A slide plate 35 is mounted on the lower surface of the elevating base 32 so as to be slidable in the tube direction of the flat tube 1 by a tension cylinder 41. An upper clamp body 24 having a clamp surface 25 corresponding to the upper flat surface of the other flat tube portion 3 is fixed to the slide plate 35.
The lower clamp body 22 having the clamp surface 23 corresponding to the lower flat surface of the other flat tube portion 3 can be clamped and unclamped by the clamp cylinder 26 on the support portion 36 extending downward from It is attached to.

That is, in the first embodiment , the first and second clamping means 11 and 21 and the shearing cylinder 3
1, a shearing mechanism 10 is mainly composed of an elevating base 32, and a tensioning mechanism 40 mainly composed of first and second clamping means 11, 21 and a tension cylinder 41 and a slide board 35.
Is configured.

Next, a description will be given of an operation of the cutting apparatus of the first embodiment configured as described above and a cutting method. First, in a state where the movable clamp body 14 of the first clamp means 11 and the lower clamp body 22 of the second clamp means 21 are unclamped by the clamp cylinders 16 and 26, respectively, Second clamping means 1
The flat tube 1 is set through 1 and 21. At this time,
The cut portion of the flat tube 1 has first and second clamping means 1
The flat tube 1 is positioned so as to match the adjacent surfaces of the flat tubes 1 and 21. Here, the movable clamp body 14 and the lower clamp body 22 are clamped by the clamp cylinders 16 and 26, respectively, and the first and second clamp means 1 are provided.
The flat tube 1 is clamped by 1 and 21.

The lifting base 32 is smaller than the flat tube 1 in thickness by the shearing cylinder 31.
It is descended by a click. Thereby, the first clamping means 11
On the other hand, the second clamp means 21 is displaced by a displacement amount perpendicular to the flat surface of the flat tube 1 and smaller than the thickness dimension of the flat tube 1. As shown in FIG. 3, a shear load is applied to the cut portion of the flat tube 1 based on the vertical displacement of the first and second clamping means 11 and 21. A fragile portion 4 that is plastically deformed is formed at the cut portion 1.

As described above, after the weak portion 4 is formed at the cut portion of the flat tube 1, the slide board 35 is slid in the tube direction of the flat tube 1 by the tension cylinder 41.
As a result, as shown in FIG. 4, both the first and second clamping means 11 and 21 are displaced in directions in which they are relatively separated from each other, so that a tensile load is applied to the fragile portion 4 of the flat tube 1. You. And the flat tube 1 is cut | disconnected in the weak part 4 which is a to-be-cut part based on the said tensile load. Thereafter, the movable clamp body 14 and the lower clamp body 22 are respectively unclamped by the clamp cylinders 16 and 26 of the first and second clamp means 11 and 21, and the cut flat tube is taken out. .

(Embodiment 2 ) Next, Embodiment 2 of the present invention will be described with reference to FIG. In the second embodiment , a pair of upper and lower clamp bodies 2 is mounted on a lifting base 32 which is raised and lowered by a shearing cylinder 31.
A second clamping means 22 having a pair of upper and lower clamp bodies 43 and 44 is mounted on a slide plate 35 which is slid by a tension cylinder 41 with respect to an elevating base 32. 42
Has been assembled. The upper clamp body 24 of the second clamp means 21 is fixed to a lifting base 32, and the lower clamp body 22 is clamped and unclamped by a clamp cylinder 26. Tensile clamping means 4
The upper clamp body 44 is fixed to a slide board 35, and the lower clamp body 43 is clamped and unclamped by a clamp cylinder 45. In addition, fixed
The first clamping means 11 having both movable clamp bodies 12 and 14 is configured in the same manner as in the first embodiment. That is,
In the reference example 2, the first and second clamping means 1
The shearing mechanism 10 is mainly composed of a shearing cylinder 31, a lifting cylinder 32 and a lifting base 32.
The pulling mechanism 40 is mainly composed of a pulling cylinder 41, a slide board 35, and a pulling clamp means 42.

[0015] Accordingly, in this Reference Example 2 is San
Similarly to the first embodiment , the first and second clamping means 1
By displacing the flat tubes 1 and 21 in a direction perpendicular to the flat surface of the flat tube 1, a weak portion 4 is formed in the cut portion of the flat tube 1 as shown in FIG. Then, the second clamping means 21
The lower clamp body 22 is unclamped by the clamp cylinder 26, while the tension clamping means 4
The lower clamp body 43 is clamped by the clamp cylinder 45. Here, when the slide plate 35 is slid by the tension cylinder 41, the flat tube 1 is pulled between the first clamp means 11 and the tension clamp means 42, so that the flat tube 1 is Is cut at

(Embodiment 3) Next, Embodiment 3 of the present invention will be described with reference to FIGS. In the third embodiment , a second clamp means 21 having a pair of upper and lower clamp bodies 22 and 24 is attached to an elevating base 32 which is moved up and down by a shearing cylinder 31. Both clamp bodies 22 of the second clamp means 21,
24 is clamped and unclamped by clamp cylinders 26 and 27, respectively. A rocking plate 52 is guided by a guide means (not shown) about the portion to be cut of the flat tube 1 as a fulcrum, and is rocked by the rocking cylinder 51 as a driving source.
Has been assembled. Further, a swinging clamp means 55 having a pair of upper and lower clamp bodies 56 and 57 is attached to the swinging board 52. The lower clamp body 56 of the swing clamp means is fixed to the swing board 52, and the upper clamp body 57 is clamped and unclamped by a clamp cylinder 58. The first clamping means 11 having both fixed and movable clamp bodies 12, 14
Is configured in the same manner as in Reference Example 1. That is, in the third embodiment, the shearing mechanism 10 is composed mainly of the first and second clamping means 11 and 21 and the shearing cylinder 31 and the elevating base 32, and the first clamping means 11 and the swinging cylinder 51 are provided. , The swinging plate 52 and the swinging clamping means 55 constitute a swinging mechanism 50.

[0017] Thus, in this Reference Example 3, participants
In substantially the same manner as in the first embodiment, the fragile portion 4 is formed at the cut portion of the flat tube 1 as shown in FIG. Thereafter, the upper and lower clamp bodies 22, 24 of the second clamp means 21 are unclamped by the respective clamp cylinders 26, 27. Similarly, the swinging clamp means 5
The upper clamp body 57 is clamped by a clamp cylinder 58. Then, the rocking plate 52 is rocked by the rocking cylinder 51, so that a compressive load and a tensile load alternately act on the weak portion 4 of the flat tube 1, as shown in FIG. Thereby, the flat tube 1 is satisfactorily cut at the fragile portion 4.

[0018] Next (Example 1), an embodiment 1 of the present invention according to FIG. In the first embodiment , the lifting base 32 which is raised and lowered by the shearing cylinder 31 is swingably guided by a guide means (not shown) with the vicinity of the cut portion of the flat tube 1 as a fulcrum. A rocking plate 62 that is rocked by using as a drive source is assembled. The slide board 35 is attached to the swinging board 62 so as to be slidable in the tube direction of the flat tube 1 by a slide / tension cylinder 46. Then, the second clamp means 2 is provided on the slide board 35.
1 is fixed, and the lower clamp body 22 is assembled by a clamp cylinder 26 so as to be capable of clamping and unclamping. In addition,
The first clamping means 11 having both fixed and movable clamp bodies 12 and 14 is configured in the same manner as in the first embodiment. That is, in the first embodiment , the first and second clamping means 1
The shearing mechanism 10 is mainly composed of a shearing cylinder 31, a lifting base 32, and a first and second clamping means 11, 21 and a swinging cylinder 61 and a swinging plate 6.
2.Sliding / pulling cylinder 46 and slide board 35
Thus, the tension / swing mechanism 60 is configured.

Therefore, in the first embodiment , the lifting plate 32 is lowered by the shearing cylinder 31 in a state where the second clamping means 21 is arranged at the shearing position shown by the solid line in FIG. The fragile portion 4 is formed in the cut portion of the flat tube 1 in substantially the same manner as in Reference Example 1 . Then, after the lower clamp body 22 of the second clamp means 21 is unclamped by the clamp cylinder 26,
Slide plate 35 by slide / tension cylinder 46
At the same time, the second clamp means 21 is moved to the tension / swing position shown by the two-dot chain line in FIG. Here, the lower clamp body 22 of the second clamp means 21 is again clamped. Then, the rocking plate 62 is rocked by the rocking cylinder 61, and at the same time, the slide plate 35 is slid by the slide / tension cylinder 46, so that a tensile force is applied to the weak portion 4 of the flat tube 1. While being acted upon,
A compressive load and a tensile load are applied alternately, whereby the flat tube 1 is cut more satisfactorily at the fragile portion 4.

In the first embodiment, the case is described in which the fragile portion 4 is formed at the cut portion of the flat tube 1 by lowering the lift platen 3 once by the shearing cylinder 31, but the present invention is not limited to this. . For example, the fragile portion 4 may be formed at the cut portion of the flat tube 1 by moving the lift board 3 up and down as appropriate. In this case, the fragile portion 4 becomes as weak as possible, and subsequent cutting becomes easy. In addition, the implementation
In Example 1 , cutting can be performed in parallel with the width direction of the flat tube 1, or as shown in FIG. 9, cutting at a predetermined inclination angle θ with respect to a line L parallel to the width direction of the flat tube 1. Can also. When the flat tube 1 is cut at an inclination angle θ, the cut end 1a of the flat tube 1 can be easily inserted into the mounting hole 7 of another member 6 and assembled.

[0021]

As described above, according to the present invention, according to the flattened pipe cutting method according to the invention of claim 1, after forming the fragile portion by a shear load to the cleavage site of the polarized Tairakan, the fragile portion while applying a tensile force, because the tensile and compressive load loading is a method of cutting by acting alternately, the cleavage site of the flattened pipe
To form a fragile part by shear load
In this case, the flat tube can be cut more satisfactorily as compared with the case where a cutting force is applied to the flat tube, and the cutting cost can be reduced. According to the flat tube cutting device according to the second aspect of the present invention , the cutting method can be easily performed.

[Brief description of the drawings]

1 is a cross-sectional view showing the cutting apparatus of the flat tube of Example 1 of the present invention.

FIG. 2 is a sectional view taken along the line II-II of FIG.

FIG. 3 is an explanatory view showing a state in which a fragile portion is formed at a cut portion of the flat tube.

FIG. 4 is an explanatory view showing a state where the flat tube is cut at a fragile portion.

FIG. 5 is a sectional view showing a flat tube cutting device according to a second embodiment of the present invention;

FIG. 6 is a sectional view showing a flat tube cutting device according to a third embodiment of the present invention;

FIG. 7 is an explanatory view showing a state where the flat tube is cut after forming a fragile portion in the cut portion.

FIG. 8 is a sectional view showing a flat tube cutting device according to the first embodiment of the present invention.

FIG. 9 is an explanatory view showing an embodiment in which a flat tube is cut obliquely.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Flat tube 4 Fragile part 10 Shearing mechanism 11 1st clamping means 21 2nd clamping means 31 Shearing cylinder 40 Tension mechanism 41 Tension cylinder 50 Swing mechanism 60 Tension and swing mechanism

Continuation of the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) B23D 15/00 B23D 21/00 B26F 3/00

Claims (2)

(57) [Claims] 1. A plastically deformed fragile portion is formed by applying a shear load to a portion to be cut of a flat tube in a direction perpendicular to the flat surface of the flat tube. Cutting the flat tube at the weak portion by fixing one flat tube portion bordering the weak portion and swinging the flat tube portion around the weak portion while supporting the other flat tube portion as a fulcrum. A method for cutting a flat tube. 2. The flat tube according to claim 1, further comprising a first and a second clamping means which are adjacent to each other with a cut portion of the flat tube as a boundary and clamp the flat tube respectively. A shearing mechanism for displacing with a displacement amount smaller than the thickness dimension of the flat tube in a direction orthogonal to the flat surface of the flat tube, and a state where one flat tube portion on one side is fixed with respect to a cut portion of the flat tube. Then, while pulling the flat tube portion on the other side, swing around the vicinity of the cut portion as a fulcrum.
An apparatus for cutting a flat tube, comprising: a swing mechanism.