Method and Arrangement for Roll-forming a Plane Product with Varying Width
During the roll-forming of a plate bar section (11) to a profile (12, 13) with variable width and upright sides (22,23) with (FIG. 1) or without (FIG. 2) flanges (24, 25), the upright sides (22, 23) are clamped in one of the last three forming stations (FIG. 12). This can yield a product with a plane bottom so that the product is not bent up (FIG. 8) or down (FIG. 10), which happens without the above-cited clamping (FIG. 13) of the upright sides (22, 23).
The invention relates to a method for forming a plane sheet bar section to a profile with a central, plane bottom part and with a varying width and upright sides with or without associated flanges along the length of the profile and relates to a roll-forming machine comprising two rows of forming stations which can move laterally and rotatably for forming such a profile.
BACKGROUND OF THE INVENTIONRoll-forming machines for such a roll-forming with a variable profile form are known from a plurality of publications.
Examples of such are DE 100 11 755 A1 and EP 1 676 654 B1. The equipment and procedure for obtaining plane products are described in DE 20 2009 007 527 U1 and SE 100 12 28 A1. Other patent publications also describe arrangements for making the bottom part plane with the aid of arrangements which are separate from the forming stations. Equipment is also known with which a plane product is bent in separate stations after the roll-forming process itself. See patent EP 1 439 920 B1 and EP 1 877 205 B1.
THE PURPOSE OF THE INVENTION AND A SHORT DESCRIPTION OF THE INVENTIONIt is a purpose of the invention to reduce or entirely avoid that the roll-forming process gives the formed product a central bottom part which is not plane in the longitudinal direction. This is brought about in principle in that, directly after or in conjunction with a complete folding up, the folded-up sides are clamped over the entire height of the sides with a constant force so that the distribution of stretching in the clamped sides is corrected and that a plane product with a variable width is obtained when the roll-forming is finished. The invention is defined by the claims.
The transverse view is indicated by arrows 5-5 in
The top view is indicated by arrows 6-6 in
The arrows 71, 72 indicate how the forming rollers can be rotated. AN movements are motor-driven and computer-controlled but the drive arrangements are not shown. Therefore, the forming rollers 41, 42 and 43, 44 can be moved sideways 61, 62 during the roller forming process and they can moreover be rotated around the axles I and II as indicated by the arrows 71, 72.
In order to prevent that the finished product is bent in the vertical plane, i.e. that its bottom 21 (
The machine has the same basic appearance even if a product without flanges is formed (
Claims
1. Roll-forming machine comprising two rows of forming stations (32, 33) for forming a plane bar section (11) to a product (12, 13) with a central bottom part (21) with a width varying along the product's length and with upright sides (22, 23), wherein the forming stations (32, 33) can move laterally (61, 62) and rotationally (71, 72), characterized by
- an arrangement (51, 52) in one of the three last forming stations (32, 33) on each side for clamping the upright profile side (22, 23), comprising
- a clamping roller (45, 46) with a constant clamping force (55, 56) with a forming roller (41, 42) as holding-up tools, wherein
- the contact surfaces of the forming rollers (41, 42) and the clamping rollers (45, 46) are parallel with the upright side (22, 23).
2. Roller forming machine according to claim 1, characterized by that
- the clamping arrangement (51, 52) is placed in the next to the last forming station.
3. Roller forming machine according to claim 1, characterized by that
- in the clamping arrangement (51, 52) are clamping rollers (45, 46) placed on the inside of the profile above the bottom part (21).
4. Roller forming machine according to claim 1, characterized by that
- in the clamping arrangement (51, 52) are clamping rollers (45, 46) placed on the outside of the profile.
5. Roller forming machine according to claim 1, characterized by that
- the clamping forces (55, 56) of the clamping rollers (43, 44) are produced by a pressure cylinder (57, 58).
6. Roll-forming machine according to claim 5, characterized by that
- the pressure cylinder (57, 58) is hydraulic.
7. Roll-forming machine according to claim 5, characterized by that
- the pressure cylinder (57, 58) is electrical.
8. Roll-forming machine according to claim 5, characterized by that
- the pressure cylinder (57, 58) is pneumatic.
9. Method for roll-forming a plane bar section (11) to a product (12, 13) with a central, plane bottom part (21) with a varying width and upright sides (22, 23) by successively bending up the sides in a number of forming stations, characterized by that
- the bent-up sides (22, 23) are clamped over the entire height of the sides with a constant force (55, 56) directly after or in conjunction with a complete bending up.
10. Method according to claim 9, characterized by that
- in one of the three last forming stations (32, 33) the bent-up sides (22, 23) are clamped with clamping rollers (45, 46) and the forming rollers (41, 42) of the forming stations are used as holding-up tools.
11. Method according to claim 10, characterized by that
- the clamping takes place on each side of the upright profile side (22, 23) in the next to the last forming station (32, 33).
12. Roller forming machine according to claim 2, characterized by that
- in the clamping arrangement (51, 52) are clamping rollers (45, 46) placed on the inside of the profile above the bottom part (21).
13. Roller forming machine according to claim 2, characterized by that
- in the clamping arrangement (51, 52) are clamping rollers (45, 46) placed on the outside of the profile.
14. Roller forming machine according to claim 2, characterized by that
- the clamping forces (55, 56) of the clamping rollers (43, 44) are produced by a pressure cylinder (57, 58).
15. Roll-forming machine according to claim 14, characterized by that
- the pressure cylinder (57, 58) is hydraulic.
16. Roll-forming machine according to claim 14, characterized by that
- the pressure cylinder (57, 58) is electrical.
17. Roll-forming machine according to claim 14, characterized by that
- the pressure cylinder (57, 58) is pneumatic.
Type: Application
Filed: Oct 19, 2017
Publication Date: Jul 11, 2019
Inventor: Lars Ingvarsson (Borlange)
Application Number: 15/739,308