GB2187409A

GB2187409A - Channel section member

Info

Publication number: GB2187409A
Application number: GB08605463A
Authority: GB
Inventors: John Taylor
Original assignee: British Steel Corp
Current assignee: British Steel Corp
Priority date: 1986-03-05
Filing date: 1986-03-05
Publication date: 1987-09-09
Also published as: GB8605463D0; GB2187409B

Abstract

A method of producing a channel or other flanged member in which at least one of the flanges 2 is increased in thickness by an adhesively bonded strip 3 along its length. The parts of the member may be of metal or of plastics. <IMAGE>

Description

SPECIFICATION Channel section members This invention relates to channel section members and more particularly relates to such members having the thicknesses of web and flange(s) different from one another.

It is well known to roll form channel section members from uniform thickness material, e.g. steel.

It is also known to roll form such members in such a fashion thatthe flanges are thickerthan the web -the lattertechnique is troublesome and costly and such differential gauge sections possess limited forming capability.

Also, the differential thicknesses between the flange and web are pre-determined within set ranges and thus design changes cannot readily be accommodated.

There is a need therefore for a less difficult and more versatile manner of producing such channel section members.

The present invention provides a method of producing a channel or otherflanged member in which the or at least one of the flanges is increased in thickness by an adhesively bonded strip along its length.

With a U-shaped member the strip(s) is/are adhered to the flanged part of the channel which enables the two flanges to be of differentthickness and/or material from the web, the flanges may also be of different thicknesses from one another.

The material of the web/flange and the strip may be steel but the different parts may be of different grades, e.g. high strength low alloy strip on the flanges with a mild steel web. Alternatively the different parts may be constructed from different metals or from plastics material, either plain or reinforced and one or other of the parts may be ribbed.

The adhesive may be ofthe rubbertoughened epoxy/acrylic single parttype.

The section according to this invention may conveniently be used as structural members, bumpers etc. in motor vehicles, such members may also be used in modular buildings, indeed almost anywhere which is of engineering significance.

In orderthatthe invention may be fully understood, one embodiment thereofwill now be described, by way of example with reference to the accompanying drawing which is a section through the channel member.

A U-shaped section of mild steel 2m in length has a web (1)4 mm thick by75 mm wide and flanges (2) 25 mm wide and has secured along the whole of its side a strip (3) of H.S.L.A. steel 8 mm thick by 25 mm wide and secured to its lower side a strip (4) of this same steel 3 mm thick and 25 mm wide. The assembly is effected in a jig the strips being pressure bonded on to the flanges with the aid of suitable adhesive along the interfaces.

Of course only one oftheflanges may be stiffened in this fashion if required and indeed the strips may alternatively be adhered along the inner side of the flanges should this be more expedient or desirable, as shown in the dotted outline.

A section such as this exhibits characteristics which cannot readily be reproduced by rolling, as discussed above, and can be made with infinite dimensional variations and a variety of different materials and shapes. The specific dimensions and materials described with reference to the exemplified drawing are only one of many selected totypifythe concept.

1. A method of producing a channel or other flanged member in which the, or at least one, of the flanges is increased in thickness by an adhesively bonded strip along its length.

2. A method according to Claim 1, in which the strip is bonded along the outer side of one or both flanges in a U-section channel member.

3. A method according to Claim 2 in which, where strips are bonded to both flanges, said strips are of different thickness and/or material from one another.

4. A method according to any one of Claims 1 to 3, in which the said member is steel and the strip(s) is a different grade of steel or is a different metal or a plastics material.

5. A method according to any one of Claims 1 to 4 in which the strip(s) is bonded under pressure to discrete lengths of the said member.

6. A method of producing a channel or other flanged member substantialiy as herein described with reference to the accompanying drawing.

7. A channel - section or other flanged member produced by a process according to any one of claims 1 to 6.

**WARNING** end of DESC field may overlap start of CLMS **.

Claims

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION Channel section members This invention relates to channel section members and more particularly relates to such members having the thicknesses of web and flange(s) different from one another. It is well known to roll form channel section members from uniform thickness material, e.g. steel. It is also known to roll form such members in such a fashion thatthe flanges are thickerthan the web -the lattertechnique is troublesome and costly and such differential gauge sections possess limited forming capability. Also, the differential thicknesses between the flange and web are pre-determined within set ranges and thus design changes cannot readily be accommodated. There is a need therefore for a less difficult and more versatile manner of producing such channel section members. The present invention provides a method of producing a channel or otherflanged member in which the or at least one of the flanges is increased in thickness by an adhesively bonded strip along its length. With a U-shaped member the strip(s) is/are adhered to the flanged part of the channel which enables the two flanges to be of differentthickness and/or material from the web, the flanges may also be of different thicknesses from one another. The material of the web/flange and the strip may be steel but the different parts may be of different grades, e.g. high strength low alloy strip on the flanges with a mild steel web. Alternatively the different parts may be constructed from different metals or from plastics material, either plain or reinforced and one or other of the parts may be ribbed. The adhesive may be ofthe rubbertoughened epoxy/acrylic single parttype. The section according to this invention may conveniently be used as structural members, bumpers etc. in motor vehicles, such members may also be used in modular buildings, indeed almost anywhere which is of engineering significance. In orderthatthe invention may be fully understood, one embodiment thereofwill now be described, by way of example with reference to the accompanying drawing which is a section through the channel member. A U-shaped section of mild steel 2m in length has a web (1)4 mm thick by75 mm wide and flanges (2) 25 mm wide and has secured along the whole of its side a strip (3) of H.S.L.A. steel 8 mm thick by 25 mm wide and secured to its lower side a strip (4) of this same steel 3 mm thick and 25 mm wide. The assembly is effected in a jig the strips being pressure bonded on to the flanges with the aid of suitable adhesive along the interfaces. Of course only one oftheflanges may be stiffened in this fashion if required and indeed the strips may alternatively be adhered along the inner side of the flanges should this be more expedient or desirable, as shown in the dotted outline. A section such as this exhibits characteristics which cannot readily be reproduced by rolling, as discussed above, and can be made with infinite dimensional variations and a variety of different materials and shapes. The specific dimensions and materials described with reference to the exemplified drawing are only one of many selected totypifythe concept. CLAIMS