JPH07241737A - Roll forming method and device therefor - Google Patents

Abstract

PURPOSE:To provide a roll forming device obtaining mold members that can easily divide a mold formed by bending a strip metal plate by the roll forming device. CONSTITUTION:In a roll forming device formed of plural stages of roll forming means, the lower roll 21b of the first stage roll forming means 21 formed of a pair of rolls that are an upper roll 21a and the lower roll 21b is provided with two cutting edges 22 in symmetry. When a strip metal plate passes between the upper roll 21a and the lower roll 21b, dividing grooves are formed at equal spaces by the cutting edges 22. A clearance 23 is set between the upper roll 21a and the cutting edges 22 in order to adjust the thickness of the dividing grooves. No separation is generated during forming since the clearance 23 is provided to form the dividing grooves. Also, because of forming the dividing grooves simultaneously by the cutting edges 2 during roll forming, work for dividing a mold into mold members by a metal saw or the like in a post-process after the termination of roll forming can be omitted so as to be able to save the labor of roll forming.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and apparatus for roll-forming a metal plate, and more particularly, when a roll-formed product is continuously formed into a single metal plate for mass production, it is manually or machine-processed after the roll-forming in a post process. The present invention relates to a roll forming method and device that can be easily divided into roll-formed articles by work.

[0002]

2. Description of the Related Art Conventionally, the following method has been adopted when mass-producing roll-formed products. One is roll-forming the metal plate drawn from the metal plate coil,
There is a method in which a long molded product is manufactured and the molded product is cut into a product length by shirring or a metal saw. The other is a method in which a metal plate is cut into an appropriate length in advance and roll-formed.

However, in the former method, when a long roll-formed product is cut into product lengths, the roll-formed product escapes or cuts as soon as a cutting blade comes into contact with the roll-formed product. It gets crushed inside. Therefore, it is difficult to hold the work and the jig is expensive. Further, since two steps of roll forming and cutting are required, another step with another type of device is required. On the other hand, in the latter method, in the case of a long product, roll molding can be performed,
In the case of a short product, when entering from a roll in the front stage to a roll in the rear stage, it may hit the lower roll or may not reach the roll in the rear stage, so that roll forming cannot be performed.

The above problems will be described as a simple example of roll forming by a roll forming process as shown in a schematic view in FIGS. 5A and 5B. FIG. 5A shows a roll including a forming process in which a strip-shaped metal plate 1 (hereinafter referred to as the metal plate 1) is drawn out from the coil 2 and provided with a roll forming means 6 including a pair of an upper roll 3a and a lower roll 3b. FIG. 3 is a schematic diagram showing a mode of molding by the molding device 4, and cross sections of a metal plate before molding and a molded product after molding are respectively indicated by cross sections 5 and 6a. Usually, in the roll forming process, a device having 10 to 20 stages is often used.

FIG. 5 (B) shows four lines for the sake of simplicity.
3 illustrates a roll forming process consisting of steps. FIG. 5B
In, when the metal plate 1 is formed into a desired shape,
Instead of bending the metal plate 1 at a large angle,
A pair of rolls having different forming shapes for each stage, for example, upper rolls 7a, 8a, 9a, 10a and lower rolls 7b, 8b, 9
b, 10b, respectively, roll forming means 7, 8, 9
While sequentially passing between No. 10 and No. 10 in the direction perpendicular to the paper surface, the product is gradually bent to finally obtain a molded product 6 having a desired shape.

By the way, when connecting a duct provided with a flange, for example, a flange portion of an air conditioning duct, as shown in FIG. 6, a flange 12 of the duct 11 and a flange 14 of the duct 13 are packed via a packing 15. Together, the four corners are connected with the corner fitting 16, the bolt 17 and the nut 18. Then, by providing a clip 19 across the flange 12 of the duct 11 and the flange 14 of the duct 13, the flange 12 and the flange 14 are pressed against each other to supplement the strength of the connection between the duct 11 and the duct 13. ing.

When the clip 19 is manufactured by the roll forming apparatus, conventionally, a long metal hoop material is roll-formed to form a clip material 19a having a shape as shown in FIG.
After that, the clip 19 was manufactured by cutting the clip material 19a with shirring, a metal saw, or the like.

However, when such a cutting method is adopted, when the clip material 19a is cut, the clip material 19a escapes or is crushed as soon as the shirring blade or the blade of the metal saw comes into contact with the clip material 19a. It is important to hold the work when cutting. Actually, a jig having a groove into which the clip material 19a is inserted is made of a plastic block or a metal block by wire cut electric discharge machining or the like, and the clip material 19 is inserted into the groove of the block.
It was cut with a inserted. However, this cutting method is costly for the jig and requires two steps, resulting in poor productivity and high cost. Furthermore, precision was required for the jig.

[0009]

In view of the above problems, the present invention does not employ a method such as cutting with a cutting means such as the shirring or cutting a metal plate in advance when mass-producing a roll-formed product. Even so, it is an object to provide a roll forming method and apparatus suitable for quality improvement, productivity improvement, and cost reduction, in which a molded product can be easily divided.

[0010]

Therefore, at least one roll of at least one pair of rolls forming a roll forming apparatus is provided with a ridge forming a blade, and a metal plate is formed on a metal plate during forming during the roll forming process. By inserting the dividing groove into the space, the molded product is divided into individual molded products by simply bending and cutting from the dividing groove by a manual work or a mechanical work after the roll forming in the subsequent process.

[0011]

When a long metal plate is supplied to the roll forming device, the dividing grooves are formed in the metal plate at equal intervals by one or both of the pair of rolls during roll forming, and the metal plate is roll formed and discharged. It The discharged molded product is divided into one molded product by hand or a tool.

[0012]

EXAMPLE A clip material 19b shown in FIG. 3 is a clip material manufactured by the roll forming apparatus of the present invention. 2 in the figure
Reference numeral 0 indicates a dividing groove formed by the roll forming method and apparatus of the present invention. Then, the worker can use this dividing groove 2
The clip 19 can be obtained by simply bending it from 0 and separating it. An example of the dividing groove 20 is shown in FIG. Such dividing grooves 20 at equal intervals
In order to put the above into the metal plate 1 to be formed, as an example,
The roll of the roll forming means 21 at the first stage of the roll forming apparatus is configured as shown in FIG. An embodiment of the present invention will be described below with reference to FIG.
And it demonstrates based on FIG.

The first stage roll forming means 21 is the upper roll 2
1a and the lower roll 21b, the conventional device performs only the function of the first folding. However, the present invention has two blades 22, 22 on the lower roll 21b of the first stage roll forming means 21.
Are provided symmetrically at intervals of 180 degrees. As a result, the metal plate 1 that has passed between the upper roll 21a and the lower roll 21b has the blades 22 and 22 every time the lower roll 21b makes a half rotation.
Thereby, as shown in FIG. 2, the dividing groove 20 is put into the metal plate 1 simultaneously with bending. Here, the length of the half circumference of the roll is set to be the length of the product.

Here, in order to prevent cutting during the molding even if the dividing groove 20 is inserted, as shown in FIG. 1B, a blade 22 provided on the upper roll 21a and the lower roll 21b is provided. A clearance 23 is provided between the two. An appropriate amount of this clearance 23 is determined by the thickness of the metal plate 1. The amount of the clearance 23 is preferably set to 30 μm to 200 μm. To give a few examples,

The plate thickness of the metal plate is 1.6 mm, the vertical roll interval d1 (hereinafter referred to as the interval d1) is 1.6 mm, and the projection amount d2 (hereinafter referred to as the projection amount d2) by which the blade 22 projects from the lower roll 21b. ) Is 1.55 mm, the clearance 23 is set to 50 μm.

When the thickness of the metal plate is 1.2 mm, the distance d1 is 1.2 mm, and the protrusion amount d2 is 1.15 mm, the clearance is set to 50 μm. Metal plate thickness is 1.0m
m, spacing d1 is 1.0 mm, protrusion amount d2 is 0.95 mm
In this case, the clearance is set to 50 μm. The thickness of the metal plate is 0.8 mm, the distance d1 is 0.8 mm, and the protrusion amount d
When 2 is 0.75 mm, the clearance is set to 50 μm. The metal plate has a thickness of 0.5 mm and the distance d1 is 0.
When the protrusion amount d5 is 5 mm and the protrusion amount d2 is 0.46 mm, the clearance is set to 40 μm.

The value of the clearance is only an example, but it can be set depending on the method of storing the product after completion of molding, and if it is desired to store it for a long time, the clearance of the dividing groove should be thickened to about 400 μm and left, Also,
If you want to immediately divide and store as individual products, make it smaller than the above clearance, for example, 30 μm,
At the same time as it is discharged from the roll forming device, it can be naturally divided and put into a storage box. As described above, the clearance is an amount that can be freely adjusted depending on the storage method, and 30 μm to 1/2 of the plate thickness is suitable.

In the above-mentioned embodiment, the clip used as the flange retainer for connecting the air conditioning duct is taken as an example, but it is obvious that it can be applied to mass production of similar roll-formed products. Further, in order to change the interval between the dividing grooves according to the length of the product, the diameter of the roll may be changed or the number of blades provided on the roll may be changed.

In the above-mentioned embodiment, the lower roll of the first stage is provided with the blade and the dividing groove is formed at the same time as the bending, but this may be performed by the roll forming means other than the first stage. Also,
The blades for the dividing grooves may be provided on either the upper or lower rolls, the second roll, or both the first and second rolls, or both the upper and lower rolls. Can also be implemented. Further, in the case of forming a dividing groove in the metal plate in the first stage forming roll, only a blade is provided on at least one roll of the pair of first stage rolls, and it may be carried out as a dedicated roll for inserting the dividing groove. it can.

In the above-mentioned embodiment, the forming rolls are paired in the upper and lower sides, but the present invention is not limited to this, and as shown in FIG.
4b may be arranged, or alternatively, as shown in FIG. 7B, the forming roll may be a front roll 25a and a rear roll 2.
It goes without saying that the present invention can also be implemented by arranging and configuring 5b.

[0021]

According to the present invention, when a roll-formed product is mass-produced, by providing a ridge on one of the rolls of the roll-forming device, the rolls are provided with dividing grooves at equal intervals on the metal plate during roll-forming. You can put it in. As a result, (1) there is no need for cutting after molding with a metal saw,
It can be easily divided by hand into individual products. (2) Therefore, it is possible to perform work for two steps of roll forming and dividing grooving instead of conventional cutting in one step, productivity is improved because one step is required, and a cutting device is not required, which contributes to space saving. However, this leads to further cost reduction.

[Brief description of drawings]

FIG. 1 is an explanatory view of a main part of an embodiment of the present invention.

FIG. 2 is an operation explanatory diagram of the embodiment of the present invention.

FIG. 3 is an explanatory view of a main part of a molded product molded according to the present invention.

FIG. 4 is an explanatory view of a main part of a conventional molded product.

FIG. 5 is a schematic view of a roll forming device.

FIG. 6 is an explanatory view of a structure in which a duct is reinforced and connected by a clip.

FIG. 7 is another schematic view of the roll forming apparatus.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 strip metal plate 11, 13 duct 12, 14 flange 19 clip 20 dividing groove 21 roll forming means 21a upper roll 21b lower roll 22 blade 23 clearance

Claims (9)

[Claims] 1. A roll forming method for a metal plate comprising a plurality of stages of roll forming steps, wherein a dividing groove is formed in the metal plate in at least one of the roll forming steps. Method. 2. The roll forming method for a metal plate according to claim 1, wherein the dividing groove is formed in the metal plate in the first stage roll forming step. 3. A roll forming method for a metal plate, comprising a plurality of stages of roll forming steps, wherein a dividing groove is formed in the metal plate by a ridge provided on the roll. 4. The roll forming method for a metal plate according to claim 3, wherein the protrusion provided on the roll is a blade. 5. A roll forming apparatus for a metal plate, wherein at least one roll of at least one pair of rolls forming a roll forming means is provided with a ridge for forming a dividing groove in the metal plate. Roll forming equipment for metal sheets. 6. A roll forming apparatus for a metal plate, wherein a protrusion for forming a dividing groove in the metal plate is formed on at least one roll of a pair of rolls at a first stage of roll forming means constituted by a plurality of roll forming steps. A roll forming device for a metal plate, which is provided with a strip. 7. A roll forming apparatus for a metal plate, wherein at least one roll of at least one pair of rolls forming roll forming means is provided with a ridge for forming a dividing groove in the metal plate, and the ridge and the ridge are provided. A roll forming device for a metal plate, which is characterized in that a clearance is provided between the roll and a roll not provided. 8. The roll-forming apparatus for a metal plate according to claim 5, 6 or 7, wherein at least one protrusion for forming a dividing groove is provided on the metal plate. 9. The ridge for forming a dividing groove in the metal plate is a blade, and the protrusion is a blade.
A roll forming apparatus for the metal plate described.