JPH04200927A - Method and device for forming cold roll - Google Patents

Abstract

PURPOSE:To obtain a high-accuracy plate thickness by bringing draw-forming rolls composed of horizontal rolls, side rolls and edge side rolls into contact with a formed material formed nearly in the final sectional shape. CONSTITUTION:The formed material 1 formed by rolls used as plate thickness nearly in a final sectional shape is passed through drawing rolls 10. In the compound 1, compressive stress acts on flange parts 1b of the formed material 1 through rolling reduction by horizontal rolls 11, 12, compressive stress acts on the web part 1a through rolling down by right and left side rolls 13, compressive stress acts on lip parts 1c through side rolls 13 and intermediate edge side rolls 14 and compressive stress in the direction of the plate width acts on the entire body of the formed material 1. Deformation of the material by the compressive stress is relieved in the corner with radius and the external dimension of the section of the formed material 1 takes a desired dimension corresponding to a roll caliber.

Description

[Detailed Description of the Invention] "Industrial Application Field" The present invention relates to a cold roll forming method and an apparatus.
In particular, the present invention relates to a cold roll forming method and apparatus that are applied when forming a different plate 17 of the same size product with an open cross section using a roll for both plate thicknesses.

[Conventional technology] In cold roll forming, a material with an open cross section and the same external dimensions or
When forming products of the same size but with different thicknesses, rolls for multiple thicknesses are used. The multi-thickness roll is a forming roll that forms a roll hole shape corresponding to each thickness by adjusting the position in the roll width direction of a roll divided into a plurality of rolls according to each thickness. For example, if we take the lipped groove ml shown in FIG.
If the plate thickness is different, the developed length of the material will be longer. Length Lu+
, flange portion length LF, and lip portion length Lp vary depending on the plate thickness. Therefore, even if the product is of the same size, if the plate thickness is different, the bending position during molding will change, and the position of the edge will change. For example, in the lip bending process shown in FIG. 5, the A dimension, 3 dimension, and C dimension vary depending on the plate thickness. However, for the dual-thickness roll, the positions of the upper horizontal roll 2 and the lower horizontal roll 3 in the roll width direction can be adjusted by adjusting the thickness of the shim 4, or the A and 3 dimensions can be adjusted, or the C dimension can be adjusted by the roll. Since there is no way to adjust the position of the edge, we do not specify the C dimension, that is, the height and position of the edge. In this way, the multi-thickness roll has a roll hole shape that allows the bending of each sheet thickness to correspond to the position by adjusting the roll position, but does not restrict the height position of the edge. In this case, the roll hole shape is designed based on the common range (g) maximum plate thickness, and the position of the roll in the width direction is adjusted accordingly when forming a thin product.

[Problems to be Solved by the Invention] By the way, the permissible dimensional accuracy of lightweight section steel specified by JIS is ±15 to ±2,0 mr, and for that degree of dimensional accuracy, "1. However, it is not easy to satisfy the requirement of permissible dimensional accuracy of ±0 or 5 mrn, for example. In order to achieve such high precision, it is desirable to use a dedicated roll for each plate thickness as a roll hole type that defines not only the A dimension and 3 dimensions mentioned above, but also the C dimension, that is, the edge height position. . However, having a dedicated roll for each sheet thickness means having a dedicated roll for each sheet thickness for all forming stands, which significantly increases equipment costs (roll costs) and reduces the opportunity to rearrange the rolls. Although it increases significantly, it does not bring about a significant goth 1 hair lump. Under these circumstances, it is desired to be able to achieve high dimensional accuracy while using a roll that can accommodate multiple plate thicknesses.

By the way, forming that applies compressive stress in the width direction of the material, that is, drawing, to obtain the dimensions of the final cross-sectional shape is common when forming closed cross-sections such as round pipes and square pipes. However, this is not done for channel steel, lipped smooth steel, and other open cross-section lightweight sections whose final shape is obtained by bending.

This is based on the idea that when forming an open cross section by bending, the bending itself is equivalent to determining the dimensions, so the dimensions are adjusted by drawing (so-called sizing) wherever possible, such as when forming steel pipes. This is due to the fact that it does not exist in the first place. However, even in the open cross-section forming process, applying compressive stress in the width direction of the material itself is carried out, although the purpose is different from the above. For example, Japanese Patent Publication No. 134686 discloses applying compressive stress in the sheet width direction to two sides on both sides of the corner radius in order to sharpen the Corey-R (folding and forming). In addition, Japanese Patent Publication No. 62 36769 discloses applying compressive stress in the plate width direction to the flange portion in order to reduce deformation at the cut end during forming of channel steel or the like. However, these steps are not done for the purpose of improving the dimensional accuracy of the product.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a cold roll forming method and apparatus that can achieve high dimensional accuracy for each thickness without using a roll for multiple thicknesses. purpose.

1. Means for Solving the Problem] The invention of claim 1 which solves the problem described in item 1 is a method for manufacturing products of the same size with different thicknesses having an open cross section and having the same external dimensions but differing only in thickness. A cold roll forming method in which the material is formed into a substantially final cross-sectional shape by the multi-thickness roll, which is commonly used in the cold roll forming method. A roll hole specific to the plate thickness is made up of upper and lower horizontal rolls and left and right side rolls that contact and roll down from the top and bottom and left and right, and edge side rolls that contact and restrain the left and right edges of the formed material. The invention of claim 2 is characterized in that a final desired cross-sectional shape is obtained by applying compressive stress in the sheet width direction to the forming material using a drawing roll having a die, and the cold roll according to claim 7. A cold roll forming device for forming lipped smooth steel using a forming method, which includes a web section horizontal roll that contacts the web section of the forming material from the outside surface, and a lip section horizontal roll that contacts the lip section from the outside surface. , a drawing roll consisting of left and right flange side rollers that contact the left and right flanges from the outside, and edge side rolls that are arranged between the left and right lips and contact the edges of the left and right lips, respectively. The invention according to claim 3 is characterized in that it relates to the support structure for the edge side roll according to claim 2, in which the axis perpendicular to the core-shaped holder supported so as to be located inside the ribbed groove cross section. The invention as claimed in claim 4 is characterized in that a pair of bearings having a diameter of 100 mm is installed, and a shaft provided integrally with the edge side roll is fitted into each bearing so as to be freely inserted and removed. The invention as claimed in claim 1, characterized in that the outer ring is mounted on the core-type bolter so that the outer circumferential surfaces thereof are in contact with each other, and the edge side roll is provided with a collar portion having the same diameter as the bearing and whose outer circumferential surfaces are in contact with each other. is the lip horizontal roll of claim 2,
A small diameter outer circumferential surface is provided close to the end surface of the edge side roll.

[Function] When forming a product of a certain thickness among products of the same size with different thicknesses, a drawing roll with a unique roll hole shape corresponding to the thickness is used for normal forming using a roll for both thicknesses. Placed downstream of the roll stand. By forming the material using rolls having both plate thicknesses, it is possible to obtain a formed material having a substantially final cross-sectional shape with a dimensional accuracy within, for example, ±1.5 mm.

The molded material formed into the substantially final cross-sectional shape is subjected to compressive stress in the width direction of the sheet when passing through the drawing rolls. That is,
1. The lower horizontal roll and left and right side rolls apply pressure to the outer surface of the molded material from above and below and from left and right.
In this state, the edge side rolls restrain the edges of the material, thereby applying compressive stress in the sheet width direction to the material. The deformation of the material due to this compressive stress escapes to the corner radius (in other words, the corner radius becomes smaller), so that the outer dimensions of the cross section of the molded material are adjusted to desired dimensions corresponding to the roll hole shape. In other words, drawing forming is performed.

When the sheet thickness is changed, adjust the position of the sheet thickness roll in the roll width direction according to the corresponding sheet thickness, and adjust or replace the position of the edge side roll of the drawing roll to improve the roll holes. Change the mold to a roll hole mold of the plate thickness.

As a result of the above, for example, ±1.
Even if an error of about 5 to ±2 mm occurs, high dimensional accuracy of, for example, ±0, 5 mm can be achieved with subsequent drawing rolls.

The invention of claim 2 is applied to forming a channel steel with a lip. In this case, the web part horizontal roll and lip part horizontal roll apply compressive stress to the flange part of the molded material, the left and right flange part Zyde rolls apply compressive stress to the web part of the molded material, and the left and right flange part side rolls apply compressive stress to the web part of the molded material. and the middle 2
Each of the two edge side rolls applies compressive stress to the lip portion, thereby applying compressive stress in the width direction of the formed material. In other words, drawing is performed.

The edge side rolls that are located between the left and right lips and contact the edges of the left and right lips, respectively, have a smaller diameter than when horizontal rolls are used to restrain the edges of the lips, and they attract material from upstream into contact. Due to its short length, there is less slippage and less friction between the material and the roll. Therefore, no scratches or the like occur on the material.

In the third aspect of the invention, the edge side rolls can be replaced in accordance with the thickness of the plate by simply inserting and removing the edge side rolls, and changes in plate thickness can be easily accommodated.

In the invention of claim 4, the outer circumferential surfaces of the outer rings of the two bearings contact each other, and at the same time, the ribs integral with the edge side rolls also contact each other, so that the two edge side rolls are acted upon from each edge of the lip portion. The moments 1~ due to the forces cancel each other out, and the demands on the rigidity of the edge side roll support structure are reduced.

Further, since the flange portion is located on the lower surface of the lip portion of the molded material, when the edge side roll attempts to come off during molding, the flange portion hits the lip portion and acts to prevent the edge side roll from coming off.

In the invention of claim 5, the small diameter outer circumferential surface of the lip horizontal roll is shaped to cover the edge side roll, so that
Efforts are made to prevent the edge side roll from being pulled out.

[Example] Hereinafter, an example of the present invention will be described with reference to FIGS. 1 to 5.

FIG. 1 shows a drawing roll used for forming a channel steel with a lip, and is arranged downstream of a forming roll stand using rolls for both sheet thickness and plate thickness. The rolls for both sheet thickness and thickness are as described above with reference to FIG. 3 are each divided into a plurality of rolls, and the position in the roll width direction is adjusted by adjusting the thickness of the gym 4 to correspond to each board thickness. Therefore, the folding procedure and other aspects are the same as those for ordinary forming rolls unless they are used for the same purpose.

This drawing roll 10 includes a web portion horizontal roll 11 that contacts the lower surface of the web portion 1a of the forming material 1 (both the lipped channel steel product and the product in the forming process are indicated by the same reference numeral 1). and the left and right lip horizontal rolls 12 that contact the upper surfaces of the left and right lip portions 1o, the left and right flange Zide rolls 13 that contact the outer surfaces of the left and right flange portions 1b, and the left and right lip portions] (
It is placed between the edges 1d of the left and right lip portions 1c.
12- Consists of left and right edge side rolls 14 that are in contact with each other.

The web portion horizontal roll 11 and the lip portion horizontal roll 12 are not shown in detail, but can be adjusted to move up and down depending on the size of the product. Furthermore, the left and right flange portions of the Zydorolls 13 can be adjusted to move left and right depending on the product size. Moreover, the lip portion horizontal roll 12
has a small diameter outer circumferential surface 12a close to the upper end surface of the edge noid roll 14.

The edge side roll 14 is attached to a core-shaped holder 15 that is supported so as to be located inside the groove-shaped cross section with a lip. That is, a pair of bearings 16 having axes perpendicular to the core-type holder 15 are mounted so that the outer peripheral surfaces of the bearings are in contact with each other, and the shaft portion 14a of the edge side roll 14 is fitted into the bearings 6. With Zeru,
A collar portion 14 having the same diameter as the bearing 16 is integrated with the edge side roll 14. b is provided so that the collar portions 14b are in contact with each other in the same manner. The roll 14 is attached to the shaft portion 14a so that it can be easily inserted and removed.
is simply fitted into the bearing 16.

Furthermore, since the edge side roll 14 is subject to the most wear, it is preferable to use a hard and wear-resistant sintered alloy or the like.

This drawing roll 10 prevents warping of the forming material, horizontal bending,
Similar to the Turk's head I-' roll for correcting twisting, a surface having holes through which the forming material passes may be attached so that its movement can be adjusted. The flange section Zytrol 13 and the edge side rolls 1-4 may be separately installed accordingly.

''For example, when forming with two rolls for both thicknesses, the difference is ±1.
, S rn m A molded material having a substantially final cross-sectional shape with dimensional accuracy falling within IJ is obtained. The molded material 1 formed into this substantially final cross-sectional shape is subjected to compressive stress in the board width direction when passing through the drawing rolls 10. That is, compressive stress acts on the flange portion 1b of the formed material 1 due to rolling down by the web portion horizontal roll 11 and lip portion horizontal roll 12, and compressive stress acts on the web portion 1a due to rolling down from the left and right sides by the left and right side rolls. Compressive stress is applied to the lip IC by the left and right flange portions I/rolls 13 and the intermediate side rolls 14, and thus compressive stress in the sheet width direction is applied to the entire formed material. The deformation of the material due to this compressive stress escapes to the corner radius (that is, the corner radius becomes smaller), so that the external dimensions of the cross section of the molded material are adjusted to desired dimensions corresponding to the roll hole shape. As a result, high dimensional accuracy (for example, about ±Q, 5th rr) can be achieved. Note that the plate width direction mentioned above refers to 1 in Fig. 4.
This refers to the length direction of the thickness center line of the material indicated by the dotted chain line.

In the drawing process described above, the edge side rolls 14, which are located between the left and right lip parts 10 and contact the edges 1d of the left and right lip parts 1c, are different from those in which the edges 1d of the lip parts C are restrained using horizontal rolls. The diameter can be made smaller. Therefore, the contact length of the material introduced from upstream is shortened, there is less slip between the material and the roll, the friction is reduced, and the material is not scratched.

Furthermore, when the forming material is drawn into the drawing roll 10,
The web part horizontal roll 11 and the lip part horizontal roll 12 first contact the molded material and pressurize the flange part 11 of the molded material 1. Next, the left and right flange portion Zydo rolls 13
Pressure is applied to the web portion ia. Finally, it hits the edge side roll 14 and pressurizes the lip IC. According to such a pressurizing order, since the web part 1a is pressurized while the flange part 11) is pressurized and restrained, there is no fear of the flange part 11:J falling down, and the edge 1d of the lip part]C This prevents positional fluctuations, and is therefore considered to have a high aperture effect in a portion of the corner.

In addition, when changing the plate thickness, the edge side roll 4 can be removed from the bearing 16, and the edge side roll 14 having an outer diameter corresponding to the next plate thickness can be simply inserted into the bearing 16. The time work is extremely simple.

Further, the outer circumferential surfaces of the outer rings of the two bearings [6] are in contact with each other,
At the same time, the edge side roll 14 and the integral part 141
] are also in contact with each other, so that the two edge side rolls 1
4, the moments due to forces acting from each edge of the lip portion cancel each other out, reducing the requirement for rigidity of the edge side roll support structure.

Further, the brim portion 14. b is the lip part I of the molded material 1-
Since it is located on the lower surface of C, when the edge side roll 14 tries to come off during molding, the flange portion 14b becomes a lip portion]
It hits C and serves the purpose of preventing it from falling out.

Moreover, since the small diameter outer circumferential surface 12a of the lip horizontal roll 12 is shaped to cover the edge side roll 14, this also prevents the edge side roll 14 from being pulled out.

In addition, although channel steel with a lip was explained in the example, it has an open cross section with a shape similar in a broad sense to a channel steel with a lip, and the plate width is added to the formed material by edge side rolls that contact the left and right edges of the material. The present invention can be applied to any cross-sectional shape that allows compressive stress to be applied in any direction.

[Effects of the Invention] Since the present invention is configured as described above, it has the following effects.

The final cross-sectional shape is obtained by applying compressive stress in the board width direction to the forming material using a drawing roll with a roll hole shape specific to the board thickness after forming with a roll for both board thicknesses, so the edge height position of the material Even though the folding process is carried out using a multi-thickness roll that does not constrain the thickness, it is possible to obtain the same high shape and dimensional accuracy for products of all thicknesses.

Additionally, when changing the plate thickness, the position of the edge side roll can be adjusted or replaced, and the roll hole shape of the drawing roll can be made unique to the plate thickness, making it extremely easy to respond to changes in plate thickness. It's easy.

According to the invention of claim 2, the diameter of the edge side roll (edge side roll) is small and the lead-in contact length of the material fl from upstream is short, so there is little slip between the material and the roll, and friction is small. Therefore, no scratches or the like occur on the material.

According to the third aspect of the invention, the edge side roll can be replaced by simply inserting and removing the roll, and the work is extremely simple.

According to the invention of claim 4, the outer circumferential surfaces of the two bearings are in contact with each other, and the collars of the two edge side rolls are also in contact with each other, so that the moments due to the forces acting on the respective edge side rolls cancel each other out. This reduces the requirement for the rigidity of the edge side roll support structure.

Furthermore, since the flange portion is located on the lower surface of the lip portion of the molded material, it also functions to prevent the edge side roll from being pulled out.

According to the invention of claim 5, the edge side roll is prevented from being pulled out by the small diameter outer circumferential surface of the lip horizontal roll.

[Brief explanation of the drawing]

Fig. 1 is a front view of a drawing roll used for forming channel steel with a lip, showing an embodiment of the present invention, Fig. 2 is a plan view thereof, Fig. 3 is a side view thereof, and Fig. 4 is a drawing roll used for forming a channel steel with a lip. 5 is a cross-sectional view of the channel steel with a lip, and FIG. 5 is a front view of a roll for both sheet thickness and plate thickness during the lip bending process in forming the channel steel with a lip. 1... Channel steel with limp, 1a--Web part, 1b
...Flange part, IC/lip part, 1 d...Edge, 2...Lower horizontal roll (roll for both board thickness), 3...
・Lower horizontal roll (roll for both sheet thickness), 4...Shim, 1
0...Drawing roll, 11...Horizontal roll for web portion, 12.Horizontal roll for lip portion, 12a...Small diameter outer peripheral surface, 13...Zide roll for flange portion, 14...Edge side roll, 1.4a ...Shaft part, 14 b...
Flange portion, 15... Core type holder, 16... Bearing.

Claims (5)

[Claims] (1) A cold roll forming method in which products of the same size with different thicknesses, which have an open cross section, the same external dimensions, and differ only in thickness, are formed using a roll that is commonly used for each thickness. After the material (1) is formed into a substantially final cross-sectional shape by the multi-thickness roll, upper and lower horizontal rolls (11) contact the outer surface of the material (1) formed into the substantially final cross-sectional shape and roll it down from above and below and from the left and right. , (12) and left and right side rolls (13
) and edge side rolls (14) that contact and restrain the left and right edges (1d) of the forming material, and have a roll hole shape specific to the plate thickness (10).
), a cold roll forming method characterized by applying compressive stress in the sheet width direction to the forming material to obtain a final desired cross-sectional shape. (2) A cold roll forming apparatus for forming a channel steel with a lip using the cold roll forming method according to claim 1, the web portion horizontal roll (11 ), a lip horizontal roll (12) that contacts the lip from the outside, left and right flange side rolls (13) that contact the left and right flanges from the outside, and left and right rolls that are arranged between the left and right lips. A cold roll forming apparatus comprising a drawing roll (10) comprising edge side rolls (14) that respectively contact the edges of the lip portion. (3) A pair of bearings (16) having perpendicular axes are attached to the core-shaped holder (15) supported so as to be located inside the groove-shaped cross section with a lip, and each bearing (16) is attached to the 3. The cold roll forming apparatus according to claim 2, wherein a shaft (14a) provided integrally with the edge side roll (14) is fitted into the edge side roll (14) so as to be removable. (4) Mount the bearing (16) on the core-type holder (15) so that the outer circumferential surfaces of the outer rings are in contact with each other, and place the bearing (16) on the edge side roll (14) with the same diameter and outer circumference as the bearing (16). The cold roll forming apparatus according to claim 3, further comprising a flange (14b) whose surfaces are in contact with each other. (5) The lip horizontal roll (12) has a small diameter outer peripheral surface (1) close to the side surface of the edge side roll (14).
3. The cold roll forming apparatus according to claim 2, characterized in that it has the following features: 2a).