JPS5815207B2 - Manufacturing method of corrugated fin - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Among corrugated fins (hereinafter referred to as corrugated fins) used in corrugated heat exchangers, this invention particularly applies to ultra-high pressure corrugated fins whose fluid passages have a burst pressure of 450 kg/cm2G or more. Regarding the manufacturing method.

Conventional methods for forming this type of fin include a method in which a pair of upper and lower forming blades are moved up and down, and a method in which the fin is formed by passing it between two gear-shaped rollers that mesh with each other. However, these methods are effective when the material is a thin plate, but when the material is thick like the high pressure corrugated fin mentioned above, it becomes mechanically difficult to form the fin. There were problems such as poor dimensional (height) accuracy and a reduction in the thickness of the fin portion.

The present invention solves these problems and proposes a method for manufacturing stable ultra-high pressure corrugated fins of high quality and at low cost.

This invention is a method of continuously forming a band-shaped material into a wave shape using upper and lower forming blades, in which the forming blades are composed of three upper forming blades and two lower forming blades, and one lower forming blade is fixed to the material supplying side and the other forming blades are fixed to the mold. 2
The two lower molding blades are attached to the hydraulic lift holder at the same level so as to protrude from the above molding blade, and the two lower molding blades are fixed to the lower mold so as to mesh with the lower molding blade. This is characterized in that a stripper is provided to support the side surface of the lower molding blade for separating the molded fins from the fins, and the upper and lower molds are mounted on a press machine for molding.

Hereinafter, one embodiment of the present invention will be explained with reference to the drawings.
1 to 3 indicate lower forming blades, and among these three lower forming blades, the lower forming blade 1 on the material side is fixed to the upper mold 8 by a presser metal fitting 6 and an upper holder 7, and the other lower forming blades 2 and 3 is attached to the lifting holder 10, which is held in the upper mold 8 by black bolts 11 so as to be able to move up and down, using a presser metal fitting 9.

In this case, the lower molding blades 2 and 3 are made to protrude from the tip of the lower molding blade 1 fixed to the upper mold 8 and are attached at the same level.

In addition, hydraulic pressure is applied from the back side of the lifting holder 10 to which the two lower forming blades 2゜3 are attached through an oil passage 12 provided in the upper mold 8, so that the lower forming blades 2 and 3 are maintained at a predetermined level. Provided so that

As for its structure, for example, as shown in the figure, the upper holder 1 of the lower forming blade 1 is made into a cylindrical shape, and the lifting holder 10 is placed inside the upper holder 1.
are slidably fitted and suspended using hanging bolts 11.

On the other hand, the lower molding blades 4 and 5 are fixed to a lower holder 14 fixed to the lower mold 13 with a presser metal fitting 15.

In this case, the lower forming blade 4 is installed opposite to the trough of the upper forming blade 2, the other lower forming blade 5 is installed opposite to the trough of the lower forming blade 3, and the peak of the lower forming blade 2 is opposite to the trough of the lower forming blade 2. The lower forming blade 4.degree. 5 is attached so as to fit into the recess 16 formed by the trough of the blade 5 and the peak of the other lower forming blade 4.

Upper and lower strippers 17, - 174 are provided before and after the lower forming blade, that is, on the material side and on the product side, for separating the formed fins from the upper and lower forming blades.

Among these four strippers, the lower stripper 171
, 172 are resiliently supported by springs 18, and upper strippers 173, 174 are fixed, and the side surfaces of these four strippers are provided so as to support the side surfaces of the upper and lower molding blades 2-5.

This is to prevent bending, escape, and breakage of the upper and lower forming blades during fin forming.

Furthermore, the reason why the lower forming blades 1, 2, and 3 are made into a divided structure is to prevent the thinning phenomenon of the fins during forming, and to enable forming by only bending without straining the material.

The upper mold 8 and the lower mold 13 are integrated by a guide post 19, and are attached to a press machine (not shown) so that the corrugated fins are formed by the vertical movement of the press machine.

In the figure, numerals 20 and 21 indicate flattening blocks.

Reference numeral 22 denotes a feed roller for the material 23, and the vertical movement of the press is driven rotationally by a rack and pinion mechanism.

That is, in this invention, the lower forming blade 2 and the lower forming blade 4 form 1 fin (% pitch), and the forming blade is connected to the lower forming blades 4 and 5.
When engaged, some of the oil in the lower forming blade holder escapes and maintains the stopped state.

Subsequently, the upper mold 8 descends, and the lower molding blade 1 and the lower molding blade 4 form one fin (% pitch).

When one pitch of molding is completed, the lower molding blades 1 and 2°3 begin to rise from the bottom dead center of the press machine, and are pressed downward by the upper holder 7 and the lower molding blades 1, 2, and 3 during molding. The lower strippers 171 and 172 rise together with the lower forming blade under the action of the spring 18, and the lower stripper 1 is at the position shown in the figure.
71 and 172 stop, and then the upper stripper 173 and 174 separates the formed fins from the upper and lower forming blades 1 to 5.
This is done by

Then, just before the top dead center of the upper mold 8, the material feed roller 22
Rotate the fin by one pitch to move the material forward by one pinch.

Next, the formed fin crest is clamped by the recess 24 formed by the lower forming blade 2゜3 and engages with the recess 16 of the lower forming blade, and at the same time, the fin crest is held by the lower forming blade 2 and the lower forming blade 4. is formed by half (% pitch), and the upper forming blade 1 descends to form the remaining half (% pitch) between it and the lower forming blade 4.

Thereafter, similar operations are repeated to continuously form corrugated fins.

Note that small wavy fins of 7,477 inches, for example, 12 fins/inch (6p/inch), can be formed with only three pieces, the lower forming blades 1 and 2 and the lower forming blade 4. In the case of the target thick-walled ultra-high pressure-resistant fins, the influence of the newly formed fins on the already formed fins may result in deformation of the waveform, reduction in height accuracy, or lack of a predetermined number of fins/inches.

For this reason, in this invention, the lower forming blade 3 and the lower forming blade 5 are provided.

As explained above, according to the present invention, by assembling the upper and lower molds having upper and lower molding blades together and attaching them to a press machine, it is possible to mold the wave-shaped fins only by the vertical movement of the press machine. This eliminates the need for a special machine for forming fins, and the vertical movement of the forming blade allows thick fins to be formed, increasing forming speed.

Furthermore, by making the lower forming blade have a split structure and employing a hydraulic mechanism, it is possible to easily prevent the phenomenon of thinning, and there is also the advantage that there is no 11 ironing 1+ phenomenon of the material and it is possible to form it only by bending.

In addition, it is also possible to form fins with a wide width.

[Brief explanation of the drawing]

The drawing is a longitudinal sectional side view showing a device according to an embodiment of the present invention. In the figure 1, 2, 3... Upper forming blade, 4, 5... Lower forming blade, 6
, 9, 15... Holder metal fitting, 7... Upper holder, 8... Upper mold, 10... Lifting holder, 11... Hanging bolt, 12
...Oil passage, 13...Lower mold, 14...Lower holder, 16
．． 24...Concavity, 171 172...Lower stripper,
173,17°... Top soot stripper 18... Hey, 1
9...Guide post, 22...Feed roller, 23...Material.

Claims (1)

[Claims] 1 In a method of continuously forming a band-shaped material into a wave shape using upper and lower forming blades, there are three lower forming blades and two lower forming blades, and one of the three lower forming blades on the material supply side is attached to the upper mold, The other two blades are attached to an elevating holder that is suspended from the upper mold so that they can move up and down and hydraulic pressure is applied from the back side, and are attached to the same level so as to protrude from the molding blade attached to the mold, and the two lower molding blades is fixed to the lower mold so as to mesh with the lower molding blade, and strippers for separating molded fins elastically supported by springs are provided in front and rear of the lower molding blade so as to support the sides of the molding blade, A method for producing corrugated fins, which is characterized by attaching upper and lower molds to a press machine and molding them.