JPH0399724A - Method and device for forming cold roll - Google Patents

Abstract

PURPOSE:To reduce the residual stress of the flange part by executing the bending back of the channel steel flange part having lip with the vertical roll for bending back which is a truncated downward conical shape roll and arranged inside of the formed goods. CONSTITUTION:On the time of the cold roll forming of the channel steel 1 with lip from the band steel, the deep bending and bending-back of the flange part 1a of the formed goods 1 are executed after forming to the final sectional shape. On executing bending-back, the outer peripheral part of the upper end side of the vertical rolls 6, 6A for bending-back which are arranged inside of the formed goods 1 are brought to push the neighborhood of the corner part of the lip part 1b side of the frange part 1a of the formed goods 1. In such a way, the residual stress of the flange part 1a is reduced and the deformation of cutting section is reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a cold roll forming method and apparatus for forming a section steel from a strip steel into a lipped II shape, and particularly relates to prevention of cut end deformation.

[Prior Art] Generally, when forming channel steel with a lip using a cold roll forming device, as in the case of forming a simple U-shaped 73J section steel, in the process of bending the flange part using the upper and lower forming rolls, Due to torsional stress acting on the flange, etc.
Residual stress remains in the flange portion of the molded product, and when this molded product is cut with a cutting machine, the residual stress is released, causing deformation at the cut end. That is, Fig. 9 (Iu, (
In the L sea urchin cutting opening shown in b), a deformation of the cutting opening usually occurs in that the two-liquid side portion B of the cutting opening of the molded product 1 opens and the downstream part of the cutting opening closes.

In the figure, Wo is the width of the molded product 1 at a longitudinally intermediate portion sufficiently in front of the cutting point (the original width of the molded product without the influence of cutting), and Wl is the width of the upstream portion B of the cutting opening. , W2 is the width of the molecule on the downstream side of the cutting opening. Note that both the final cross-sectional shape and the intermediate stages are referred to as molded products.

In order to prevent deformation of the cut end such as cracks, it is necessary to
It is known that it is effective to deeply bend the flange and then return the bend. That is, when deep bending and unbending of the flange portion is performed, residual stress in the flange portion is removed by repeatedly applying bending deformation to the flange portion, and deformation at the cut end is reduced.

As a conventional method for performing the above-mentioned repeated bending, there is a method applied to channel steel rather than channel steel with a lip, for example, Japanese Patent Publication No. 60-18257.

As shown in the 1st IEJ (a) and (b), between the roll stands near the final roll stand, a downward truncated conical deep bending roll, II; I: roll (bar decal roll for pushing), ) 2 and a downward truncated conical vertical roll for unbending (vertical roll for pushing back)
3 and deep bending of the flange portion 1a' of molded product 1'' (same figure (
In this conventional method, both the vertical roll 2 for deep bending and the vertical roll 3 for unbending are performed on the flange of the molded product 1'. Part 1
2L' in contact with almost the entire height direction of the flange],
= 1 deep bend Bending back is being performed.

[Problems to be Solved by the Invention] The conventional method described above directly applies the idea of repeatedly applying bending deformation to the flange to remove residual stress in the flange and prevent deformation of the cut end. In actual molding, there are many cases 6 in which deformation of the cut end is not necessarily effectively prevented. ” 1. The conventional example is for channel steel, but the same applies to channel steel with a lip. For example, when forming a channel steel with a lip of C2,3>75x45x15, For example, the difference between the upstream width W1 and the downstream width W2 (WI W21 Q, 5
It has not always been possible to keep it within the range of mm.

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 effectively prevent cut end deformation in cold roll forming of lipped channel steel. .

[Means for Solving the Problems] The invention of claim 1 which solves the above problems is a cold roll forming method for forming a channel steel from a strip steel into a final cross-sectional shape or a cross-sectional shape close to this. After the molded product is molded, the flange portion of the molded product is deeply bent and unbended, and the unbending is performed using a downward a
This is a cold roll forming method in which the upper end outer circumferential portion of an H-cone-shaped vertical unbending roll is pushed into the vicinity of the corner portion of the lip portion of the flange portion of the molded product.

The invention of claim 2 is a cold roll forming apparatus that implements the method of claim 1, and includes a cold roll forming apparatus that performs forming on the outside of the molded product between roll stands near the final roll stand 1 or at a downstream position of the final roll stand. A deep bending roll for deeply bending the flange part of the product is placed inside the molded product at a downstream position of the deep bending roll, and the upper end of the roll forms a downward truncated conical shape and the outer periphery of the upper end of the deep bending roll is placed inside the molded product at a downstream position of the deep bending roll. This is a cold roll forming device in which a vertical roll for bending back is arranged near the lip side corner of the flange.

The invention according to claim 3 is the invention according to claim 2, in which the base end portions of the pair of links are connected to a common rotation center axis provided vertically above the molded product, and the tip of each link is This is a cold roll forming device in which the vertical roll for unbending described above is rotatably taken, and the eccentric part of the vertical eccentric shaft for adjustment is fitted into the elongated hole drilled in the middle part of each link. .

[Effect: Unbending after deep bending the flange part of the molded product,
This is done by pushing the vicinity of the lip side corner of the flange of the molded product outward with the outer periphery of the 1st end of the downward truncated conical vertical roll for unbending, that is, the vicinity of the corner of the flange is partially When the molded product is pushed back and bent back, the residual stress in the flange part is effectively removed, and the 17J section deformation when the molded product is cut is reduced.

Moreover, according to the structure of claim 3, even for a small-sized channel steel with a lip, the pair of left and right vertical rolls for unbending can be easily arranged inside the molded product so that the interval can be adjusted. be.

[Example 1] An example of the present invention will be described below with reference to FIGS. 1 to 9.

Figures 1 to 3 show an embodiment of the cold roll forming method and apparatus of the present invention. Figures 1 (a) to (n) are explanatory diagrams of the forming process, and FIG. 3 is a plan view schematically showing the main parts of the roll forming apparatus after the final roll stand, and FIG. 3 is a side view of the same.

In the embodiments of the molding method and apparatus of the present invention,
First, to explain the outline, the steel strip is formed by the upper and lower forming rolls shown in FIGS. 1 (a), (b), and (c).

It is bent and formed in the order of (d), and then, in the example, as shown in FIG. Incidentally, in actual molding, the molding is usually performed by folding 1110 times using a roll screen having a larger number of stages, but this is shown in a simplified manner.

At the downstream side of the final forming roll 4, as shown in FIGS. 2 and 3, a downwardly facing truncated cone is provided on the outside of the molded product 1 for deeply bending the flange portion 1a of the molded product. An idling vertical roll 5 for deep bending is disposed inside the molded product 1 at a downstream position of the deep bending roll 5, which also has a downwardly facing truncated conical shape, and its upper end outer peripheral portion 6a forms the molded product. The flange portion 1a of the molded product 1 which has been molded to the final cross-sectional shape as shown in FIG. The vertical roll for deep bending 5 bends the material deeply at an angle α (FIG. 1 (FIG. 1)), and then the vertical roll 6 for unbending bends the flange portion 1a at an angle β (FIG. 1 (FIG. 1)). )).

In this embodiment, as shown in the figure, the deep bending vertical roll 5
Further, one set of vertical rolls for deep bending 5A and vertical rolls for unbending 6A similar to the vertical rolls for unbending 6 are arranged, and the vertical rolls for deep bending 5A and the vertical rolls for unbending 6A are used for deep bending again. - Performing unbending. In other words, deep bending and unbending are repeated twice. and,
In the case of the example, the molded product [I] which has been finally unbent as shown in FIG. The material is then sent downstream and cut by a cutting machine.

For example, in the actual forming of a C2,3X75X45X15 (plate thickness x unib width x flange height x lip width) channel steel, the above-mentioned M rolls 5 and 5A for deep bending and 11C roll 6 for unbending are used. As a result of experiments in which deep bending and unbending of molded products at 6A were carried out, the deformation at the cut end was reduced to the extent that the condition of W + - W 2 20, 5 mm, which could not be achieved using conventional methods, was satisfied. I was able to do that.

FIGS. 4 to 6 show an example of the specific structure of the deep bending/unbending device 10 that performs the above-mentioned deep bending and returning of the curve ζ'. In these figures, reference numeral 11 indicates a deep bending and unbending device 10.
The base plate 1 is fixed on the molding machine bed 12. A slide plate 1B is provided on the base plate 11 so as to be movable along the guide rail 14 in the width direction of the molding machine (in the left-right direction in FIG. 6). Play with this slide 1 )-13 has stand 15 at Porto 1
Nuts 1 to 17 are fixed to one stand 15, and the bearing fixed on the base plate 11 is fixed to the block 18, and one adjustment screw is attached to the nut block so that it can only rotate. There is a vA sound on 17. By turning one of the adjustment screws,
5 in the width direction of the molding machine, and move and adjust the roll 5 (5A) for deep bending and the roll 1' (roll 6 (6A) for unbending).
) can be moved and adjusted in the width direction of the molding machine as a whole.

Front 3, stand 15 (1 (II &: 20 is attached so that it can be moved up and down with bolt 21 and nut 22. Zunawaji, stand) 5 has a vertical A guide hole 15a is drilled, and the cylindrical shaft portion 21a of the set pole l-21 attached to the side plate 2o fits into the kite hole 15a so as to be movable up and down, and is tightened with a nut 22.
” is fixed.

An l-tub plate 23 is fixed to the upper part of the side plate 20, and the top plate 1/23 has the above-mentioned first stage deep bending vertical roll 5 and first stage unbending vertical roll 6.2.
Vertical roll 5A for deep bending in the second stage, bending back roll 1' in the second stage
Take the f roll ('Jεt) to the page with the appropriate pitch. The threaded portion 24a of the adjustment screw 24 is threaded into a female screw block 25 provided at the upper end of the stand 15, and by recessing the adjustment screw 24, the I.
The tongue plays 1 and 23 and the side plates 20 are aligned with the stand 15 and driven up and down, and the height positions of the vertical roll 5 (5A) for deep bending and the eaves 1' (roll 6 (6A) for unbending) are adjusted. It has become.

As shown in FIGS. 6 and 7, the deep bending roll 5 (5A) has a non-eccentric portion 26a of the threshold shaft 26 rotatably mounted on the top plate 23. , is rotatably attached to an eccentric portion 26b that is eccentric (the amount of eccentricity is indicated by e) with respect to the non-eccentric portion 262t. When adjusting the amount of deep bending of the vertical roll 5 (5A) for deep bending, by meshing the nut 32 and rotating the eccentric shaft 26 to a desired angle, The eccentric portion 26b is the non-eccentric portion 26
Rotate around 2t, shoot 1110 degrees deep, ゛t1
Call 5 (5Δ) is in the width direction of the molding machine (left and right direction in Figure 7)
The movement is adjusted and the deep bending angle is adjusted.

2 The unbending vertical roll 6 (6A) is rotated around a common rotation center shaft 27 rotatably housed in the I-tub plate 23, as shown in FIGS. 4, 5, 7, etc. 2-) is rotatably attached to the link 28 (m), and a vertical roll 6 (6A) for bending back is rotatably attached to the tip of each link 28. An eccentric portion 29L with an eccentricity e2 (see FIG. 8) of two eccentric shafts, each having a non-eccentric portion 29εL rotatably attached to the I/tub play 1 23, is fitted into the elongated hole 28a. When the two eccentric shafts are rotated, the eccentric portion 2
9 +] moves in the width direction of the molding machine according to the rotation angle to open and close the left and right links 28, and the left and right unbending vertical rolls 6 (
Adjust the interval of GA). In this way, the amount of unbending of the unbending vertical roll 6 (6A) is adjusted.

As mentioned above, with the structure in which the vertical roll 6 (6A) for unbending is attached to the link 28 in 2-), the vertical roll for unbending can be arranged in a narrow groove of the lipped channel steel in an adjustable manner. It's getting easier.

Further, a roller 30 is attached to the side plate 20 as a receiver for receiving the molded product 1, and a press roller 31 for holding down the molded product 1 from -L is attached to the tip of the top plate ~l-23.

In addition, in the above-mentioned example of each actual jir, two sets of vertical rolls for deep bending and vertical rolls for unbending were provided, but only one set may be provided.

In addition, in the example, the #Iit roll for deep bending and the vertical roll for unbending were provided at the downstream position of the final roll stand, but they can also be placed between the roll stands before reaching the final roll stand. . In this case, the two links are deeply bent and unbended before being formed into the final cross-sectional shape, and then formed into the final cross-sectional shape using the upper and lower forming rolls of the final roll stand.

For deep bending rolls, it is also possible to use lower rolls, which are the same as forming rolls, instead of vertical rolls.

[Effects of the Invention] Since the present invention is configured as described in section 1, it has the following effects.

Deep concavity of the flange part of channel steel with limps The unbending process is performed using a downward truncated conical vertical roll for unbending placed inside the molded product. By pressing the lip near the corner, the residual stress on the flange can be reduced, and the deformation of the cut end can be minimized.
S.

Further, according to the structure of claim 3, a small-sized lip-attached i
Even for M-section steel, it is possible to actually perform the deep denting and unbending of the present invention by arranging the rolls for unbending (1 pair J) on the left and right sides so that the interval can be adjusted inside the molded product. It becomes easy to do.

[Brief explanation of drawings]

FIGS. 1(f) to 1(n) show examples of the cold roll forming method and apparatus of the present invention. Seven (!) of the forming process.
Fig. nJ1 and Fig. 2 are plan views schematically showing the main parts of the cold roll forming apparatus, Fig. 3 is a side view schematically showing the main parts, and Fig. 4 is a concrete diagram of the main parts. Fig. 5 is a side view showing the specific structure of T14 structure of the same main part, Fig. 0 is a front view showing the specific structure of the same main part, Fig. 7 (for J deep recess) FIG. 8 is an enlarged plan view of the vertical roll and eaves IT roll portion for unbending, FIG. 8 is an enlarged view of the main part of the link in FIG. 7, and FIG. 9 is for explaining the deformation of the cut end of the lipped channel steel. Figure 10 (a) is an end view of the cut end of the molded product, figure (b) is a plan view of the vicinity of the cut end of the molded product, and Figure 10 (a).
, (b) are explanatory diagrams of a conventional molding method. 1... Molded product (refaft channel steel, final formed cross section and final shape pre-stage), 1a, flange, 1b, lip, 5.5A, deep recess is vertical Roll, 6, 6Δ... Fir roll for returning the bend to 0, 6a - Upper end side outer periphery, 27... Rotation center axis, 28 - Link, 28
;'t...long hole, 29 concentric shaft, 2'Ja...non-eccentric part, 2 L+ eccentric part.

Claims (3)

[Claims] (1) In the cold roll forming method of forming channel steel with a lip from strip steel, after forming to the final cross-sectional shape or a cross-sectional shape close to this, deep bending and unbending of the flange portion of the molded product, The unbending is performed by pressing the upper end side outer circumferential portion of a downward truncated conical vertical roll for unbending disposed inside the molded product against the vicinity of the corner portion on the lip side of the flange portion of the molded product. Cold roll forming method. (2) In a cold roll forming device that forms lipped channel steel from strip steel, the flange of the molded product is placed between the roll stands near the final roll stand or on the outside of the molded product at a position downstream of the final roll stand. A deep bending roll for deep bending is placed inside the molded product at a downstream position of the deep bending roll, and a truncated conical shape facing downward is formed, and the outer periphery of the upper end is the lip of the flange of the molded product. A cold roll forming device characterized in that vertical rolls for unbending are arranged near side corner portions. (3) Each base end of a pair of links is rotatably connected to a common rotation center axis provided vertically above the molded product, and the above-mentioned vertical roll for unbending can be rotated at the tip of each link. 3. The cold roll forming apparatus according to claim 2, wherein the eccentric part of the vertical eccentric shaft for adjustment is fitted into the elongated hole drilled in the intermediate part of each link.