JPH0787946B2 - Cold roll forming equipment - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a cold roll forming method and apparatus, and particularly to a plate thickness adjusting means for adjusting a roll clearance corresponding to a plate thickness of a forming material, and The present invention relates to a plate thickness adjusting means suitable for being applied to a so-called roller die forming device.

[Prior Art] In the cold roll forming apparatus, when the plate thickness of the forming material is changed, it is necessary to adjust the clearance between the upper and lower rolls according to the plate thickness. The upper roll is supported rigidly so that the upper roll can be moved up and down, such as by supporting the upper roll via a screw down screw, or by using a structure in which a removable plate thickness adjustment liner is interposed in the support part of the upper roll. It is a structure.

By the way, as a roll forming method suitable for forming lightweight channel steel, etc., the material is driven by a feed drive dedicated roll stand (that is, a feed unit) having upper and lower cylindrical drive rolls. , A forming unit disposed between the feeding units and functioning as a roller die, that is, a structure in which a set of three idle rollers in contact with the vicinity of the bending corner of the forming material is provided so as to be movable and adjustable in the material width direction. A method of using a molding unit is conventionally known.

As an improvement of the molding equipment by this roller die molding method,
The applicant of the present invention is a molding device having a structure in which a butting roller that contacts the inside of a corner of the three idle rollers is rotatably supported in the plate thickness direction of the corner radius part around a fulcrum pin that is orthogonal to the material advancing direction. However, the abutment roller is rigidly supported also in this forming apparatus.

[Problems to be Solved by the Invention] The above-mentioned roller die molding method has various advantages as well as an advantage that the reassembling work associated with the change in the outer size of the product is easy. The above-mentioned patent application facilitates the adjustment of the roll clearance, that is, the adjustment of the plate thickness particularly in accordance with the change of the product plate thickness, and further increases the merit of the roller die molding method. The support is a rigid support structure, and it is necessary to adjust the plate thickness when the plate thickness is changed. It is more desirable if such a work of adjusting the plate thickness becomes unnecessary.

The present invention has been made in view of the above circumstances, the thickness is automatically adjusted according to the thickness of the molding material to be passed, cold-roll forming method and the need for plate thickness adjustment work and The purpose is to obtain the device.

[Means for Solving the Problems] According to the invention of claim 1 for solving the above problems, a portion of a forming apparatus that directly or indirectly supports a roll shaft and receives a forming load acting on a roll is provided with a spring displacement. A displacement-repulsion force curve representing the relationship with the spring repulsive force is characterized by interposing a spring having spring characteristics similar to the plate thickness-molding load curve representing the relationship between the plate thickness of the molding material and the molding load. It is a cold roll forming device.

According to the invention of claim 2, the spring is configured by combining a plurality of disc springs.

The invention of claim 3 is applied to a cold roll forming apparatus adopting a so-called roller die forming method.

According to a fourth aspect of the present invention, the roller die supporting the abutting roller is attached to the movable supporting plate so as to be rotatable in the thickness direction of the corner radius portion about the fulcrum pin orthogonal to the material advancing direction. In molding equipment,
The spring is interposed between the roller holder and the movable support plate.

[Operation] In the above configuration, each roll is set so that the roll clearance becomes zero, for example, in a state where the molding material is not passed through. When the forming material is passed through in this state, the displacement-repulsive force curve of the spring interposed in the portion receiving the forming load acting on the roll by directly or indirectly supporting the roll shaft becomes the plate thickness-forming load curve. Since they are close to each other, the repulsive force of the spring when the roll clearance is generated by the passing plate by almost the thickness of the plate is close to the forming load. Therefore,
Appropriate roll clearance can be obtained simply by passing the molding material through the plate. That is, the plate thickness is automatically adjusted.

Then, according to the method of constructing the above spring by combining a plurality of disc springs, it is easy to obtain a spring having a desired displacement-repulsion force curve corresponding to a different molding load for each molding unit.

Further, in the case of the roller die forming apparatus having a structure in which the roller holder supporting the abutting roller is rotatably pushed toward the movable support plate in the thickness direction of the corner portion around the fulcrum pin, Since only one adjustment point is required to cope with the change (that is, only the rotation operation around the fulcrum pin of the roller holder), the present invention can be easily applied and is extremely effective as an automatic plate thickness adjusting means. Is.

[Embodiment] An embodiment of the present invention will be described below with reference to FIGS. 1 to 11.

FIG. 1 is an overall side view of a cold roll forming apparatus according to an embodiment of the present invention, and 1 is a forming machine base. On the molding machine base 1, the widthwise position of the material to be molded 2 (hereinafter simply referred to as the material, the same reference numeral 2 is used for both the flat plate stage before molding and the stage where molding has progressed). Guide stand 3,
Further, horizontal roll stands 4 dedicated to driving of, for example, 6 stages shown by P _{1 to} P ₆ are installed, and roll stands 4 dedicated to each driving are provided.
A non-driving molding unit 5 indicated by R _{1 to} R ₁₀ is provided between the two. An overbend unit 6 indicated by R ₁₁ for preventing springback and a bending-back unit 7 indicated by R ₁₂ are provided on the exit side of the final-stage drive-dedicated roll stand P ₆ . In this embodiment, as shown, the web portion 2a, the flange portion 2d, the lip portion 2c.
The case of forming a lip channel steel having

The guide stand 3 guides both side edges of the material 2 by the left and right guide rolls 3a as shown in the front view in FIG.
The roll stand 4 dedicated to driving is shown in FIG. 3 showing two stages of P ₁ and P ₂ (that is, before starting the downward bending of the flange portion).
And, as shown in FIG. 4 showing four stages of P _{3 to} P ₆ (that is, after the start of the downward bending of the flange portion), the flat portion of the material 2 is sandwiched between the upper and lower horizontal feed drive rolls 4a and 4b to perform the feed drive. As shown in the figure, it is merely a feed drive and does not participate in molding.

The molding unit 5 will be described in detail. This molding unit 5 is, for example, R ₅ after molding the lip portion 2c.
As shown in FIG. 5 for R ₇ to R ₇ , a first face plate 8 serving as a common base for two adjacent molding units 5 is provided. The first face plate 8 is provided vertically to the upper and lower frames 9 fixed to the front and rear roll stands 4 dedicated to driving, and the surface thereof is orthogonal to the molding material advancing direction (arrow (a) direction in FIG. 1). To do. Further, the first face plate 8 is provided with a material passage hole through which the material passes. Each of the first face plates 8 is guided by a guide guide 10 in the material width direction (for example, the fifth face).
A pair of left and right second face plates (movable support plates) 11 each movable in the left-right direction in the drawing are provided. This second face plate 11
Has a material passage hole 11a for allowing the material to pass therethrough. Although not shown, a drive mechanism for moving the second face plate 11 left and right is provided. Also, as shown in FIG. 1, the second face plate 11 is
It is provided on both sides of the face plate 8. That is, the molding units 5 are provided on both sides of each first face plate 8.

The second face plate 11 includes a cylindrical cylindrical receiving roller 12 that comes into contact with the bottom surface of the bottom portion (web portion of lip grooved steel) 2a of the molding material 2 in the vicinity of the corner portion 2b, and the side portion (lip groove). The flanged portion of the shaped steel 2d is a cylindrical roller for forming a lateral side 13 that contacts the outer surface of 2d, and the idler roller 14 is a sharp butting roller that contacts the inner radius of the corner 2b. It is attached as a set through holders 15, 16 and 17. The shaft 18 of the receiving roller 12 is parallel to the bottom portion 2a. The shaft 19 of the side forming roller 13 is parallel to the side portion 2d. The shaft 20 of the abutting roller 14 is 2 degrees of the angle θ of the corner 2b.
It is perpendicular to the direction of the bisector. Therefore, the abutting roller
14 is a corner portion as shown in an enlarged view in FIG.
It rotates in the plane including the bisector of the angle θ of 2b. The radius (curvature radius) of the sharp outer peripheral edge of the butting roller 14 is
It is preferable that the thickness is about 1 to 3 ton with respect to the plate thickness t.

The roller holder 17 that rotatably supports the butting roller 14 has a substantially L-shape when viewed from the side as shown in FIG. 6B, and has one end fixed to the second face plate 11 with a bolt 21. The shaft of the abutting roller 14 is attached to the lower end of the holder receiver 22.
20 is rotatably connected via a fulcrum pin 23 that is parallel to 20 and the other end on the upper side is a bracket 22 of a roller holder receiver 22.
It is supported by a via a support mechanism 24.

The details of the support mechanism 24 will be described. In the recess 17a formed in the roller holder 17, a hole 22b formed in the bracket 22a is formed.
Collar 25 of guide shaft 25 with a collar slidably fitted to
The side a is inserted and the guide shaft 25 has a plurality of disc springs 2.
6 and washer 27 are fitted. This disc spring 26
Are combined so that the displacement-repulsive force curve (straight line) approximates the plate thickness-forming load curve as described later.
A load cell 28 for measuring a forming load is installed on the lower surface side of the collar 25a of the guide shaft 25. A retainer 29 is attached to the upper portion of the guide shaft 25.

Next, the operation will be described.

In FIG. 1, the material 2 is continuously sent out from a material supply device (not shown), the position in the width direction is regulated by a guide stand 3, and is sent to a drive-dedicated roll stand 4. A predetermined molding is performed by sequentially passing through the stand 4. As shown in FIG. 3 or FIG. 4, the drive-dedicated roll stand 4 simply performs the feed drive by sandwiching the flat portion of the material by the upper and lower flat feed drive rolls 4a and 4b. By the feed drive of the roll stand 4 dedicated to the feed drive, the material passes through each of the forming units 5 of R _{1 to} R ₁₀ , and the left and right of the three rollers of the receiving roller 12, the side forming roller 13 and the abutting roller 14 are passed. Functions as a roller die, and the material is sequentially bent and formed. In this molding, the abutting roller
Since 14 comes into contact with the corner rounded portion in a narrow region, the bending forming by the three rollers 12, 13, 14 can be performed with a small forming force, and the sharp bending can be performed.

In the above molding apparatus, the change of the product outer size in the similar cross-sectional shape, for example, the same lip channel steel web portion,
When changing to a product in which the dimensions of the flange portion and the lip portion are different, the second face plate 11 is moved to the left and right in the forming unit 5 of each stage, and the receiving roller 12 and the side forming roller 1 are adjusted.
3, the assembly of the butting roller 14 to the left and right second face plate 11
Together with this, it is moved and adjusted integrally and brought to the bending position in the molding stage. In this way, it is possible to perform molding of various products having similar cross-sectional shapes and different product outer sizes only by adjusting the movement of the second face plate 11.

Then, the plate thickness adjustment for adjusting the roll clearance according to the plate thickness of the molding material is automatically performed. That is, each roller is set so that the roll clearance becomes zero, for example, when the molding material is not passed through. When the molding material is passed through in this state, the abutting roller 14 that receives the molding load is pressed.
Rotates upward around the fulcrum pin 23 until the forming load and the reaction force of the disc spring 26 are balanced to form a gap corresponding to the forming load, that is, a roll clearance. In this case, since the displacement-repulsive force curve of the disc spring 26 approximates the plate thickness-forming load curve, the repulsive force of the disc spring 26 when the roll clearance is generated by the plate passing by the plate thickness corresponds to the forming load. It is an approximate size. Therefore, an appropriate roll clearance can be obtained only by passing the molding material through the plate. That is, the plate thickness is automatically adjusted.

In the above plate thickness adjustment, since the moving direction of the abutting roller 14 is the direction of the bisector of the angle θ of the corner part, it corresponds to the plate thickness change in the vertical direction (plate thickness change in the web part 2a). Not only is it possible, but it is also possible to appropriately cope with changes in plate thickness in the left-right direction (changes in plate thickness at the flange portion 2d). Therefore, the present invention is extremely suitable when the roller holder 17 is applied to the roller die molding apparatus in which the roller holder 17 is rotatable about the fulcrum pin 23 in the direction of the bisector of the angle θ of the corner radius portion, as in this embodiment. Is.
That is, if it is a normal molding machine that performs molding with upper and lower horizontal rolls, roll clearance adjustment (plate thickness adjustment) for changes in plate thickness is necessary not only in the vertical direction but also in the roll width direction (usually, Since the liner is inserted between the rolls divided in the width direction), adjustment in the roll width direction requires manual adjustment. Therefore, the effect of automatic plate thickness adjustment by the disc spring is small, but the roller die In the molding apparatus, since there is only one adjustment point that is required in response to changes in the plate thickness, no manual adjustment is required, and the effect of the present invention is extremely large.

Further, not only in the case of the embodiment, in the roller die forming apparatus, for example, when forming a channel steel or a channel steel with a lip, the relationship between the plate thickness of the molding material and the molding load is for each molding unit. Since it is decided, the application of the present invention is easy,
In this respect, it is appropriate to apply the present invention to a roller die molding device.

Next, an example of a method of selecting the disc spring will be described. Fig. 7 shows two disc springs with an outer diameter of 25 mm, an inner diameter of 12.2 mm, a plate thickness of 1.6 mm, and a height of 2.15 mm (that is, a maximum displacement of 0.55 mm), facing each other, stacking two facing springs, and stacking two layers. A load test was conducted for each combination of facing each other, and the horizontal axis represents the spring displacement x and the vertical axis represents the spring repulsion force y. Curve L in FIG.
Is a graph showing the relationship between the forming material plate thickness t and the forming load L at R ₃ of the forming unit (at R ₃ , the bending angle α
Bending of 67.5 ° (= 180 ° -θ). In the forming unit having the plate thickness-forming load curve, for example, eight disc springs are arranged in a two-layer and four-stage stack as shown in the drawing. The combination of the disc springs is selected so that the inclination of the displacement-repulsive force curve (straight line) P approximates the approximate inclination of the plate thickness-forming load curve L. When the molding material is not passed through the washer 27 and the recess 2 of the bracket 22a.
It is set so that a predetermined gap a (Fig. 8) exists between the bottom surface of 2c. In this case, the repulsive force is not generated until the roll clearance reaches the predetermined value a, and the repulsive force is generated according to the amount of deflection of the spring.
The spring characteristic shown by the broken line P'in the figure is obtained, and is approximate to the plate thickness-forming load curve L. Therefore, when using this combination of disc springs, an appropriate roll clearance is automatically obtained according to the plate thickness of the molded material to be passed, and the molding load at that time is necessary for molding the molded material. It is the size.

Further, in FIG. 9, a curve L is a graph showing a plate thickness-forming load curve at R ₈ of the forming unit. In the forming stand of R ₈ , as shown in the drawing, six disc springs 26 are provided.
Are placed in a three-tier stack. The displacement-repulsive force straight line of the disc spring of this combination is as shown by P in FIG. 9, and the spring is substantially the same when the gap of the washer 27 portion is b when the plate is not threaded as described above. The characteristic is as shown by the broken line P ', and thus the spring characteristic approximated to the plate thickness-forming load curve L is obtained, and by using the disc spring of this combination, the proper roll clearance is automatically obtained.

Although the description of FIGS. 8 and 9 does not take into consideration that the outer radius of the bent portion of the molded material (bending radius on the outer surface side of the bent portion) accurately changes depending on the plate thickness. Considering the change of the outer radius due to the plate thickness,
As shown in the figure, the required amount of change in roll clearance (that is, the amount of spring displacement) δC when the plate thickness increases from T ₁ to T ₂ by δT is larger than δT, and δC = δT Since / cos (α / 2), it is desirable to select a spring with a spring coefficient corresponding to this. Specifically, the inclination is smaller than that of the straight line P (P ') in FIGS. 8 and 9 (small spring coefficient).
A spring will be used.

Further, depending on the location of the spring, the change in the plate thickness appears as the amount of displacement of the spring placement portion either expanding or contracting (depending on the distance from the fulcrum pin 23), so a spring with a spring coefficient corresponding to this Is selected.

The disc springs may be combined not only with the same type of disc springs but also with different spring coefficients. Accordingly, it is possible to further approximate the plate thickness-forming load curve. FIG. 11 shows an example in which two facing sheets are stacked and two sheets are stacked and facing each other. In this case, a disc spring with a small spring coefficient (matching two opposed plates) mainly acts in a region where displacement is small to form a curve with a gradual slope. After the disc spring with a small spring coefficient is flattened, the spring coefficient of the spring coefficient is reduced. The large disc springs (two overlapping and facing each other) mainly act to form a straight line with a steep slope. According to the experiment, the spring repulsive force does not change in a polygonal line shape as shown by a one-dot chain line, but changes in a curved line as shown by a solid line.

Further, the place where the disc spring is arranged is not limited to that of the above-mentioned embodiment, and various kinds can be considered. In short, the roller holder 17 and the second
It may be any location between the face plate 11 and the whole molding load.

As is clear from the above description, "a displacement-repulsion force curve representing the relationship between the spring displacement and the spring repulsion force is approximate to a plate thickness-molding load curve representing the relationship between the plate thickness of the molding material and the molding load. "Having a spring characteristic" means that it is within the applicable plate thickness range, and not only when both curves are directly superposed on each other, but also in FIG.
This includes the case where the coordinates of the spring displacement are substantially shifted as shown by the broken line P ′ in FIG. 9, or the case where the coordinates are approximate when multiplied by a constant coefficient.

Also, although it is convenient to always arrange the load cell in order to select an appropriate spring, it is not always necessary.

Further, in the above embodiment, the case of applying to the roller die forming method has been described, but the present invention is not limited to this, and it is of course that it can also be applied to a normal cold roll forming method of forming with upper and lower horizontal rolls. is there. In this case, the spring may be interposed between the upper surface of the chock supporting the upper roll shaft and the lower surface of the stand cap.

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

Since the spring receives the forming load and the proper roll clearance is automatically formed according to the forming load when the plate is passed, it is not necessary to adjust the plate thickness when changing the product plate thickness.

Then, according to the method of forming the spring by combining the disc springs, it is easy to obtain a spring having a desired displacement-repulsion force curve corresponding to the forming load of each forming stand.

Further, in the case of a roller die forming apparatus having a structure in which the roller holder supporting the abutting roller is rotatably attached to the movable support plate side about the fulcrum pin in the thickness direction of the corner portion, the change in plate thickness Since there is only one adjustment point required (i.e., only the rotation operation around the fulcrum pin of the roller holder), the application of the present invention is easy and it is extremely effective as an automatic plate thickness adjusting means. Is.

[Brief description of drawings]

FIG. 1 is an overall side view of a cold roll forming apparatus showing an embodiment of the method and apparatus of the present invention, FIG. 2 is a front view of a guide stand, and FIG. 3 is a roll stand dedicated to driving P _{1 to} P ₂ . Front view, FIG. 4 is a front view of the roll stand dedicated to driving P _{3 to} P ₆ , FIG. 5 is a perspective view of the forming unit of R _{5 to} R ₇ , and FIG. An enlarged front view of the roller, FIG. 6 (b) is a side view thereof, FIG. 7 is a displacement-repulsive force curve diagram of the disc spring, and FIGS. 8 and 9 are diagrams for explaining a disc spring selection method. Fig. 8 is for the forming unit R ₃ , Fig. 9 is for the forming unit R ₈ , Fig. 10 is a diagram for explaining another method of selecting a disc spring, and Fig. 11 is a disc spring. It is a figure explaining another selection method of. 2 ... Material (molding material), 4 ... Roll stand (feed unit) for feeding drive, 5 ... Molding unit, 8 ... First face plate, 11 ... Second face plate (movable support plate), 12 ... Receiving roller, 13 …… Side forming roller, 14 …… Pushing roller, 17 …… Roller holder, 22 …… Roller holder receiving, 22
a …… bracket, 23 …… fulcrum pin, 24 …… support mechanism, 2
5 …… Guide shaft, 25a …… Brim, 26 …… Disc spring, 27 …… Washer, 28 …… Load cell.

Claims (4)

[Claims] 1. A displacement-repulsion force curve representing a relationship between a spring displacement and a spring repulsion force at a portion of a molding apparatus that receives a molding load acting on a roll by directly or indirectly supporting a roll shaft. A cold roll forming apparatus characterized in that a spring having a spring characteristic approximate to a plate thickness-forming load curve representing the relationship between the sheet thickness and the forming load is interposed. 2. The cold roll forming apparatus according to claim 1, wherein the spring is formed by combining a plurality of disc springs. 3. A molding apparatus comprising a plurality of feeding units for only feeding and driving a material, and a non-driving molding unit arranged between the feeding units for bending and shaping the material, which is horizontal. What is claimed is: 1. A cold roll forming apparatus for forming a light-weight section steel having a cross-sectional shape having bent side portions on both sides of a bottom portion, wherein the forming unit contacts the outer surface near the corner portion of the bottom portion. The roll receiving roller, the idle side forming roller that comes into contact with the outer surface of the side portion, and the idle abutment roller that comes into contact with the inner rounded portion of the corner are movable and adjustable in the material width direction. 3. The cold roll forming apparatus according to claim 2, wherein the left and right movable support plates are mounted as a set via roller holders so as to be integrally movable and adjustable. 4. A roller holder for supporting the abutting roller is attached to the movable support plate so as to be rotatable in a plate thickness direction of a corner radius part around a fulcrum pin orthogonal to the material advancing direction. The cold roll forming apparatus according to claim 3, wherein the spring is interposed in a portion between the movable support plate and the movable support plate that receives a forming load.