Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
  • B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
  • B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
  • B21C37/12—Making tubes or metal hoses with helically arranged seams
  • B21C37/121—Making tubes or metal hoses with helically arranged seams with non-welded and non-soldered seams
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
  • B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
  • B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
  • B21C37/12—Making tubes or metal hoses with helically arranged seams
  • B21C37/124—Making tubes or metal hoses with helically arranged seams the tubes having a special shape, e.g. with corrugated wall, flexible tubes

Definitions

• This invention concerns improvements in and relating to helically formed tubing.
• Such helically formed lock-seam tubing has a variety of uses.
• the tubing is usually of generally cylind ⁇ rical configuration, although for some purposes it is desired that the tubing be corrugated. Corrugation of lock-seam tubing requires additional manufacturing steps that correspondingly increase the cost of the tubing.
• an object of the invention is to provide a simple means of forming corrugated, helically wound tubing.
• this object is achieved by providing that a pair of rollers arranged to engage internal and external surfaces of the tubing during forming thereof, in order to effect finishing of the seam in the tubing , are further so shaped and arranged that they serve the additional function of forming a helical corrugation in the wall of the tubing, in the region of the finished seam.
• the a invention accordingly provides a novel tube forming process, a machine for carrying out such process, and an improved corrugated tube helically formed by such a process.
• the single figure of the accompanying drawing is a sectional elevation of the forming head of a machine for the production of helically wound lock-seam tubing, shown in the process of forming such tubing.
• the reference numeral 1 illustrates the forming head of a machine for the production of helical lock-seam tubing.
• the machine is of generally known type including means for feeding a metal strip into the forming head 1 , and means for forming on the longitudinal edges of the metal strip flanges that are interlocked with one another in the finished tubing.
• Such features of the machine will be familiar to one skilled in the art of the production of helically wound lock-seam tubing, and will therefore not be further described in detail.
• the machine is provided with a pair of clinching rollers 2 and 3, of which the roller 2 is supported for rotation within the tubing at the point of formation of a closed helix of the metal strip, via a bracket
• the roller 3 is mounted externally of the tubing via a further bracket
• the external roller 3 has a circumferential groove
• roller 6 which, in cooperation with the circumference of roller 2 serves to effect closure and compression of the lock-seam of the tubing substantially in the manner of known machines.
• the groove 6 of roller 3 is located within a recess defined by a further groove 7 of the clinching roller 3.
• the roller 2 is of correspon ⁇ dingly larger diameter, or is displaced radially relatively to the axis of the formed tubing, so that it extends into the groove 7 of the clinching roller 3.
• the invention provides for the production of helically corrugated lock-seam tubing wherein the lock-seam and the corrugation are formed simultan ⁇ eously in a simple manner without the requirement of additional post-forming steps as needed in hitherto known processes.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Rigid Pipes And Flexible Pipes (AREA)
• Exhaust Silencers (AREA)
• Gasket Seals (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=10637508

Family Applications (1)

Country Status (7)

Cited By (2)

Citations (3)

• 1988
  • 1988-05-25 GB GB888812370A patent/GB8812370D0/en active Pending
• 1989
  • 1989-05-24 ES ES89305279T patent/ES2034630T3/es not_active Expired - Lifetime
  • 1989-05-24 EP EP19890305279 patent/EP0343973B1/de not_active Expired
  • 1989-05-24 CA CA 600586 patent/CA1337963C/en not_active Expired - Fee Related
  • 1989-05-24 DE DE1989602423 patent/DE68902423T2/de not_active Expired - Fee Related
  • 1989-05-25 WO PCT/GB1989/000582 patent/WO1989011351A1/en unknown
  • 1989-05-25 AU AU36851/89A patent/AU3685189A/en not_active Abandoned

Patent Citations (3)

Also Published As

Similar Documents

Legal Events