JPS5921430A - Manufacture of heat transmission pipe - Google Patents

Abstract

PURPOSE:To manufacture with high productivity a heat transmission pipe of a holed helical fin type without wasting a material, by making a notch at a suitable pitch on a band material, taper-rolling it, curl-working it and winding it round a pipe. CONSTITUTION:A linear notch is made at a suitable pitch by a press 1, etc. to a part or one area of a band material 10 of a base material of a fin, it is made to pass through between a pair of rolls 2, 3, and a flat notched band material is obtained. The band material 10 is guided by a suitable number of guide rolls 4, 5 and 6 and is led into a pair of rolling rolls 7, 8, and in a part 7a of a comparatively small diameter of the rolling roll 7, rolling force becomes smaller than in other part, and a part 7b of both ends of the roll 7 has a larger diameter than said part 7a, therefore, regular rolling force operates on the part 7b of both ends. Therefore, a hole is formed by expanding the notch. Subsequently, said material is curled continuously, is wound around a pipe, and it becomes a heat transmission pipe provided with a helical fin.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a nonornoin type heat exchanger tube in which holes are formed at appropriate intervals in the fins wound around the tube.

Heat exchanger tube with hole j1 calfin &: j: high ze 1
It is known as heat exchanger tube [7], but conventionally,
This type of heat exchanger tube is a borrowed punch l which is the material for the fins.
The hole 1-7 was formed by King Jo, and then it was rolled and rolled into a pipe.Due to this, chips from the punching process entered the machine and caused malfunctions 11 times. 1. t:
1ain machine”? There were problems such as being hit with interest charges when using the system. Sono-1-1, punching force/power, ta4'
A power: *<a. In C), there is a drawback that when the belt A is car-linked and attached to the pipe, the tensile force of 11 mm is concentrated in the part where there is no hole σ), and that part breaks IJJ. Ta.

The purpose of the present invention is to solve the problems of the prior art, and to eliminate non-conformity due to chips and waste of materials. edge(")
Output 11;') Lr no break 11 horn + t, l-, gain
(II)
ζ.

The feature of the manufacturing method of the heat transfer coil according to the present invention (ζ11.
#4 diagonal/, 1 force tt with 1 -gland [Put 1] - - - Roll it with a pair of rolling rolls - - - - Roll it into a tube - 1 When cutting, the above-mentioned step 1 (i) should be performed so as to widen the cut.

Next, based on the drawings of Tani Teru, a heat exchanger tube according to the present invention is produced by
Explain the law. FIG. 1 schematically shows the entire culm in the method of manufacturing a heat exchanger tube according to the present invention, in which the fin elements (A/, -/'r) are shown as the first step.
Is it possible to make linear cuts at an appropriate pitch using a press (1) or the like on a part of the band U' (10) in the i and i knee areas? J4: I'm going to sleep. Is this cut a curved line?4
ji' t-i diagonal! However, as shown in Figure 2.
, It is preferable that it be a straight line o Also, make a cut (11) ・:i:' (Although the area '4 does not need to be particularly limited, a band is preferable. As a result, the edges of the cut edges are bent 12")!"'
It's not something to remove, so no scraps will come out. The debt that was cut open (10)
is passed between the rolls (2+, (3)) of −rl, and the pressed and bent part of the cut is returned to its original position to make a flat cut material. In this state, the cut fJ (I l) iJ
: As shown in Figure 2, the line method with no width (υft) is made.The line shape of this cut improves the workability of curling.
V, right". In the method of the present invention, Lυre[1(
The line 11) is not aligned with the rolling line of Llr-roll [J-ru] described below, but is inclined at an angle.

Therefore, the angle 1i is not 90 degrees with respect to both edges of the cut i, . When this "7 sea urchin cut II +) is formed, the belt kA (lol is an appropriate number of guides 17-ra (4), (5)
, fGl, is introduced into the -1j rolling roll (force, (8)).

Next, as shown in Fig. 6, the cut (-1) strip material is rolled through rolling holes (7) and (8), and is continuously curled to form a tube (not shown). The heat exchanger tube becomes a helical, Neu>-fj heat exchanger tube. (10) in Fig. 6 shows a helical fin like E. At this stage, in the present invention, the heat exchanger tube used for Taber rolling is One or both of the rolling r', I-rules (7) and (8), in the illustrated example, the rolling surface of the rolling roll (7) that is in contact with the cut I11 of the strip material (10) Part (7a)
A rolling roll having a diameter slightly smaller than that of the other part (7)) is used. Therefore, the rolling force is smaller in the relatively small diameter portion (7a) of the rolling roll (7) than in the other portions, and the both end portions (71) of the roll (7) have a larger diameter than that portion (7a). Therefore, normal rolling force acts on both end portions (71, )). Therefore, a large rolling force is applied to the edge parts on both sides of the borrowed material (10), so a large elongation occurs at that part, and the elongation force pulls the middle part where the break 1"+11) is located, causing the break. klfll) will be expanded,
A hole is formed. Figures 5 and 6 show the edge of the cut 1] old) expanded to become a hole.
), and it goes without saying that when the mark is expanded, it can play the same role as the hole in the fin.

In addition, in Fig. 4, the pressure of small diameter of force σ;
7) A small diameter portion is formed on the rolling surface of 1 which weakens the rolling force.
1, but such a small diameter part is
8) You may add 1 yen to 8), or you may add 1 yen to both rolling rolls. In this rolling process, the width of the band U (IQ) is set to 1. . Stitch, set the width of the cut to I-B, C1-A ■
;If the force is 12, p/L O in the unbroken part
(ky/rnTn), whereas the cut is parallel to the rolling line, hkJ: In the cut part, F/
A rolling force of (L, -L, ) (ky/w) is applied to the uncut portion between the cut and both edges of the barb. In order to obtain the perforated fin effect, approximately 1', j l≧1・
, -II, concentrated 11: The ductile force is more than twice that of the normal one, and cutting is likely to occur. In the present invention, since the cut (mark) is made smaller than 90 degrees (larger on the opposite side) on the edge of the strip at 17, it is possible to
The break becomes shorter. Since the fin opening [-1 hole method and the cut angle If affect the heat transfer coefficient on the surface fin side, the optimum angle is determined from both workability and heat transfer characteristics.

The shape of the cut (I11' or hole) is shown in Figure 7 (A).
Can it be curved as shown in ? f, k-It-1(
b), the inclination of the sea urchin is t, υIt, i=I. , therefore, 41-i may be linear.
0) is not used to pull out 41, so chips are produced., 7r
There is no waste of material, and there is no problem with chips or chips. Soshi-ko, mol/! There is a drawback that cutting occurs due to extreme concentration of rolling force if the cutting line is formed in the line II ke+flrF and the line A-, but in the present invention, the IJIJ line is 1 to 1. ] 7 angles are formed by leaning / Kome, there is no such drawback.The production is 1'l Pi↑If (Otsu・Satr1 From the formation of the cut Ll to the length for Qi-ba 291: The production can be increased by 1'l'l'l because the car link and the noinoninda can be made continuously in a series of lower punches.

-Therefore, according to the present invention, there are no problems associated with chips or burrs, and it is possible to save on input costs. can be manufactured.

[Brief explanation of the drawing]

Figure 1 shows the production of a heat exchanger tube according to the present invention! , the entire process of the method is shown in the shield and schematic diagram.
Figure 12 is a cross-sectional view of the first notch at the initial stage of the invention, and (b) a cross-sectional view taken along the line A--A, and Figure 6 is a cross-sectional view of a roll for a deep bar sail. Figure 4(a) is a side view of one of the rolling rolls.・Yohi (ro) is a picture of the surface, No. 5
The figure is an end view of a heat exchanger tube manufactured according to the present invention, FIG. 6 is a sectional view taken along line Ll-13 in FIG. 5, and FIG. 7 (A),
([1) (7) This is a thousand-sided diagram showing other forms of cuts that can be made in Obi J. In the figure, 1... Sores, 7.8... Pressure 1fjJ, o -
/2]...Small diameter roll part, 7]]...1 part other than the small diameter part, 10...Strip shape, 11...First cut
Figure 6

Claims (1)

[Claims] Ill, :y', etc., to the fin element H borrowed money (-extraction 7.) Including the ξ step of making a cut of pure tK with bi-square, ni, l iit: ” J:tt if is inclined with respect to the rolling line of 11-Rolling D-Rule described later, and ↓,・
and also the Il of one or both of the rolling rolls.
, the diameter of the part in contact with the cut end of the C strip material is smaller than the roll diameter of the other part,
[Rolling of the above-mentioned pair to reduce the diameter] - Convex D i
:L: [Iυ extends the "11-j belt (") by -7--, thereby widening the previous iie "'J [1] and curling it to the tube. Te・\Ricalfino (: J step to make heat exchanger tube p2], manufacturing method of heat exchanger tube. (2), jjjjl 1j [2 cuts] -1 is the middle part 4 other than the lines on both sides of MfJ record H] 111I The method for manufacturing a heat exchanger tube according to claim 1, including the step of returning the pressed and bent portion to the position of I'I using a roll cutter to form a flat cut section. .