Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21D13/00—Corrugating sheet metal, rods or profiles; Bending sheet metal, rods or profiles into wave form
  • B21D13/02—Corrugating sheet metal, rods or profiles; Bending sheet metal, rods or profiles into wave form by pressing
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F28—HEAT EXCHANGE IN GENERAL
  • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
  • F28F3/00—Plate-like or laminated elements; Assemblies of plate-like or laminated elements
  • F28F3/02—Elements or assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with recesses, with corrugations
  • F28F3/025—Elements or assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with recesses, with corrugations the means being corrugated, plate-like elements

Definitions

• the invention relates to a method for the production of bodies provided with closed ribs from sheet metal, in which each rib is formed by folding a piece of tape of a certain length and a rib produced by the method.
• the closed rib produced by the method according to the invention is characterized by the fact that it has legs that lie over the entire height of the rib and that the rib head is practically without a rib eyelet.
• the invention is shown in the drawing in two exemplary embodiments and is described below. Show it:
• FIG. 1 is a schematic representation of a device for forming a rib from a belt section according to a known method
• FIG. 2 shows a schematic representation of the device according to FIG. 1 at the end of the formation of the closed ribs
• FIG. 3 shows a schematic representation of a device for producing a closed rib according to the method according to the invention at the beginning of the molding process
• Fig. 5 shows a schematic representation of a device according to FIGS. 3 and 4 for producing a closed rib, according to a variant of the method according to the invention at the beginning of the shaping of the rib and
• the schematically illustrated device u comprises two tensioning devices 1, 2, in which a band piece 3 of a steel band is clamped, the band section corresponding to the distance 4 between the tensioning devices 1, 2 for the formation of a closed rib 5 is used, see FIG. 2.
• FIGS. 3 and 4 similar clamping devices 1, 2 as in FIGS. 1 and 2 are used for the formation of the closed rib, but here the use of the folding sword moved transversely to the band piece can be omitted, which also means the relatively complex coordination of the Speeds of the tensioning devices 1, 2 and the folding sword are not required. It is important here that at the location of the rib head 7 that forms (Fig. 4) a notch 8 is arranged on the opposite side of the rib head 7 of the band piece 3. The arrangement of the notch 8 determines the direction of the deflection of the belt section, which is why no folding sword is used.
• Folding forces Fk. required and likewise the pressing force P to be used at the end of the folding process can be considerable, e.g. by about 40%.
• the rib width a is the same over the entire rib height and is approximately equal to twice the band thickness s, while for the formation of the rib 5 according to FIGS. 1 and 2, the rib width a on the rib head 7 is more than twice that Band strength s is.
• the radius R on the rib base is also approximately the same as the radius r on the clamping devices 1, 2.
• FIGS. 5 and 6 show a further possibility of forming a rib.
• the difference from that 3 and 4 consists in that, in addition to the notch 8 in the area of the rib head 7, two further notches 11, 12 are formed in the area of the rib foot, but on the opposite side of the notch 8. In this case too, a folding sword is no longer required.
• the arrangement of the notches 11, 12 makes the folding force even smaller than if only the notch 8 is provided.
• the pressing force P does not become significantly smaller than in FIGS. 3 and 4 and can accordingly also be approximately 40% smaller than in the embodiment according to FIGS. 1 and 2.
• the arrangement of the notches 11, 12 means that an almost sharp-edged transition arises at the base of the rib, i.e. the radius R is substantially smaller than the radius r provided on the clamping devices 1, 2.
• the deflection behavior, the folding force F, k and the pressing force P can be influenced to a considerable extent by the shape and the depth of the notches 11, 12.
• the tensioning devices 1, 2 are designed such that the band section 4 between the tensioning devices 1, 2 and the band piece 3 in the tensioning devices 1, 2 essentially form a straight line. If the clamping surfaces are slightly inclined in such a way that the band piece 3 assumes a flat roof-like shape, the deflection side for the formation of the ribs 5 is additionally defined.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Curtains And Furnishings For Windows Or Doors (AREA)
• Bending Of Plates, Rods, And Pipes (AREA)
• Folding Of Thin Sheet-Like Materials, Special Discharging Devices, And Others (AREA)

Priority Applications (2)

Applications Claiming Priority (2)

Publications (1)

Family

ID=4238841

Family Applications (1)

Country Status (6)

Cited By (2)

Families Citing this family (1)

Citations (8)

• 1982
  • 1982-04-30 CH CH266682A patent/CH655259A5/de not_active IP Right Cessation
• 1983
  • 1983-04-21 EP EP19830901184 patent/EP0107674B1/de not_active Expired
  • 1983-04-21 WO PCT/CH1983/000049 patent/WO1983003784A1/de not_active Ceased
  • 1983-04-21 JP JP58501244A patent/JPS59500658A/ja active Pending
  • 1983-04-21 DE DE8383901184T patent/DE3362582D1/de not_active Expired
  • 1983-04-29 CS CS833056A patent/CS244932B2/cs unknown

Patent Citations (8)

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