EP0063869A2 - Vorrichtung zum Schlitzen eines hohlen Gegenstandes - Google Patents

Vorrichtung zum Schlitzen eines hohlen Gegenstandes Download PDF

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Publication number
EP0063869A2
EP0063869A2 EP82301606A EP82301606A EP0063869A2 EP 0063869 A2 EP0063869 A2 EP 0063869A2 EP 82301606 A EP82301606 A EP 82301606A EP 82301606 A EP82301606 A EP 82301606A EP 0063869 A2 EP0063869 A2 EP 0063869A2
Authority
EP
European Patent Office
Prior art keywords
slit
slits
blades
product
longitudinal
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP82301606A
Other languages
English (en)
French (fr)
Other versions
EP0063869B1 (de
EP0063869A3 (en
Inventor
Roland St. George Dowling Day
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fibreglass Ltd
Original Assignee
Fibreglass Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Fibreglass Ltd filed Critical Fibreglass Ltd
Priority to AT82301606T priority Critical patent/ATE19605T1/de
Publication of EP0063869A2 publication Critical patent/EP0063869A2/de
Publication of EP0063869A3 publication Critical patent/EP0063869A3/en
Application granted granted Critical
Publication of EP0063869B1 publication Critical patent/EP0063869B1/de
Expired legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
    • B26D1/00—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor
    • B26D1/01—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work
    • B26D1/02—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work having a stationary cutting member
    • B26D1/03—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work having a stationary cutting member with a plurality of cutting members
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
    • B26D3/00—Cutting work characterised by the nature of the cut made; Apparatus therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
    • B26D3/00—Cutting work characterised by the nature of the cut made; Apparatus therefor
    • B26D3/001—Cutting tubes longitudinally
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
    • B26D3/00—Cutting work characterised by the nature of the cut made; Apparatus therefor
    • B26D3/28—Splitting layers from work; Mutually separating layers by cutting

Definitions

  • the present invention relates to a method and an apparatus for splitting a hollow product and more particularly of producing a longitudinal slit of stepped profile through the wall of the product.
  • the invention also includes a hollow product when made in accordance with the method and/or by the apparatus.
  • the product may for example be a hollow tubular sheath manufactured from glass fibres bound together with a binder. Such sheaths can be used for insulating pipes or conduits.
  • a method of producing a longitudinal slit through the wall of a hollow cylindrical sheath is described in French Patent Specification No. 2,271,006.
  • an apparatus is employed whose cutter assembly comprises two blades disposed in two substantially parallel planes spaced a small distance apart. Each of the two blades partially cuts through a portion of the wall of the sheath from the inside and outside respectively so as to create two spaced, substantially parallel, longitudinal slits in the wall.
  • the spacing between the two slits is sufficiently small to make it possible to fracture the thickness of the material separating them.
  • the blade which partially cuts through a portion of the inside wall is carried on a fixed cylindrical rod which passes through the centre of the hollow sheath.
  • the rod is itself supported by a vertical supporting member fixed on a frame located external of the sheath.
  • the vertical supporting member is aligned with the longitudinal slits formed in the sheath so that as the sheath is moved axially against and past the vertical supporting member the edge of that member, which is tapered, cuts through or fractures the material separating the slits.
  • the resulting product is a sheath having a slit along its entire length, the slit being a straight line slit passing through the whole wall thickness of the sheath.
  • a method of longitudinally splitting a hollow tubular product comprising the steps of (a) providing longitudinal relative movement between the product and two blades of a cutter assembly arranged so that the blades partially cut through a portion of the wall of the product one from the inside and one from the outside to form two longitudinal slits in spaced planes with the inner ends of the slits adjacent to one another characterised by the additional step (b) of applying a shearing force to the material in the region of the adjacent inner ends of the slits in a direction away from the planes of the slits to define a single stepped slit extending along the tubular product.
  • the invention also includes a method of longitudinally splitting a hollow tubular product comprising the steps of providing longitudinal relative movement between the product and two blades of a cutter assembly so that the blades partially cut through a portion of the wall of the product one from the inside and one from the outside respectively thereby forming two longitudinal slits, each slit lying in a respective one of a pair of spaced planes and having their inner ends adjacent to one another, applying a shearing force in the material in the region of the adjacent inner ends of the slits in a direction away from the planes of the slits to fracture the thickness of the material between the inner ends of the slits to define a single longitudinal slit having an intermediate step, and subjecting the material on each side of the stepped profile slit to shearing forces to open up the intermediate step and provide clearance for a part of the cutter assembly connecting the two blades to pass through the stepped profile slit.
  • an apparatus for providing a longitudinal slit through the wall of a hollow tubular product, comprising a blade assembly with two blades each of which lies in one of a pair of spaced apart planes, the blades being arranged to cut longitudinal slits partially through the wall from the inside and the outside of the product with the inner ends of the slits adjacent to one another and meaE to provide relative longitudinal movement between the product and the blade assembly characterised by the provision of means for exerting a stress in the material in the region of the longitudinal slits so that the stress acts substantially at right angles to the plane-of the slits to fracture the thickness of material between the inner ends of the slits to define a single longitudinal slit having a stepped profile.
  • the invention also includes an apparatus for providing a slit having a stepped profile through the wall of a hollow tubular product, the apparatus comprising a blade assembly and means for providing relative longitudinal movement between the product and the blade assembly, the blade assembly comprising two blades connected together by a connecting part, each blade lying in a respective one of a pair of spaced planes, the blades having a cutting section formed with a cutting edge for cutting a longitudinal slit partially through an inside and outside wall of the product respectively, means being provided for exerting a stress in the material in the region of the longitudinal slits, the stress acting substantially at right angles to the planes of the slits being sufficient to fracture the thickness of material between the inner ends of the longitudinal slits to define a single longitudinal slit having a stepped profile, and means for exerting shearing forces on the material in the region of the stepped slit, the shearing forces acting in planes substantially parallel to the planes of the longitudinal slits so as to open up the slit to allow the connecting
  • the invention further includes a hollow product having a stepped profile slit preferably of substantially Z profile through its wall, the stepped profile slit being formed in accordance with the above method and using an apparatus as set out.
  • the connecting part connects together the follower sections of the two blades and holds them spaced apart in a fixed relationship to one another.
  • the connecting part is flat and disposed in a plane substantially orthogonal to the planes in which the blades lie.
  • the pair of spaced planes in which each longitudinal slit lies can be either parallel or non-parallel to one another. It is convenient, however, to arrange the spaced planes to be substantially parallel to one another so that the resulting stepped slit has a Z profile.
  • the two longitudinal slits formed, and hence the cutting sections of the blades are level or overlap one another slightly.
  • the degree of overlap is dependent on the material of the product to be fractured but for a laminated glass fibre product the overlap conveniently lies in the range 0 mm to 10 mm. Preferably the overlap lies within the range 0 mm to 5 mm.
  • Each blade may have its cutting and follower section made as separate sections or the whole blade may be made as one integral part. It is convenient, however, to make the cutting and follower sections as separate parts of different material, for example the cutting section can be made from a hardened steel whilst the follower section can be made of mild steel.
  • the connecting part between the follower sections can then also be mode of mild steel enabling the two follower sections and connecting part to be fabricated as one integral part.
  • a further blade is provided for producing a straight longitudinal slit partially through another inside substantially opposite the stepped slit, portion of the/well of the product/ the uncut material in line with that slit serving as a hinge enabling the product to be opened and closed without the sections coming apart.
  • the method and apparatus can be used for splitting tubular /hollow products having any cross section, for example circular, square, oblong or polygonal cross sections.
  • Sheaths for pipe insulation are usually cylindrical and so heve a circular cross section.
  • the stress which fractures the thickness of material between the inner ends of the longitudinal slits is a hoop stress, whilst the shearing forces which open up the stepped profile slit act in redial directions.
  • the apparatus in Figure 1 comprises a V-shaped channel 2 made from sheet metal, a section along the base of the channel 2 being cut away so as to define a longitudinal slot 4.
  • the top of the channel 2 is bent so as to form two flat longitudinal edges 5 and each edge 5 is supported on top of a number of blocks 6 disposed at spaced intervals along one of the flat edges of a respective support 8 having a U cross section.
  • the supports 8 are connected together at each end by a respective metal cross member 10 and are supported on a pair of spaced metal blocks 12 and 13.
  • a pusher arm 14 is mounted for reciprocatory movement along the slot 4 and the top of arm 14 is cut away so as to provide clearance to enable it to pass by a cutter assembly 16.
  • the drive mechanism for pusher arm 14 is enclosed in block 12.
  • the cutter assembly 16 depends from a flange plate 18 which is secured to a fabricated steel block 20.
  • the block 20 is attached to one end portion of a ram 22 the other end portion of which is slidably mounted within a hollow cylindrical housing 24.
  • Vertical adjustment of the cutter assembly 16 is made by adjusting the position of ram 22 relative to housing 24 by means of a drive mechanism in block 13.
  • the cutter assembly has three fin shaped blades 28, 30 and 32.
  • the blade 28 is held in a blade carrier 26 attached along the bottom edge of the flange plate 18, the blade 28 being secured to the carrier 26 by a number of bolts 27.
  • the blade 30 is connected to the blade 28 by a horizontal connecting part 29 which serves to hold the blade 30 in a fixed offset position relative to the blade 28.
  • the blade 30 has one of its edges secured to a cylindrical bullet shaped rod 44, the diametrically opposite part of the rod 44 carrying the blade 32.
  • the blades 28 and 30 have two sections, a cutting section made of bardened steel and a follower section made of mild steel.
  • the cutting sections are indicated by numerals 34 and 36 respectively and can be considered as those portions of the blades to the left of the lines S in figure 2.
  • the follower sections are indicated by numerals 38,40 respectively and are those portions of the blades to the right of the lines S in figure 2.
  • the blades 28 and 30 are fixed relative to one another so that at least a portion of their cutting sections overlap one another, best illustrated in figures 3 and 4. The extent of the overlap is very important and is adjusted in dependence on the type of product which is to be split and the spacing between the blades 28 and 30.
  • the overlap lies preferably within the range 0 to 5 mm.
  • Each of the cutting sections 34 and 36 have a cutting edge 46 and 48 respectively and the portion of the cutting section leading to the cutting edge is tapered, as best shown in figure 4.
  • the taper is one side only, alternatively the taper could be from both sides.
  • the remainder of the cutting section is made fairly thick, for example 3 mm, for a purpose to be described later.
  • the follower sections 38,40 have a substantially uniform thickness throughout but are provided with flared or tapered edges 50 and 52 (see figure 3).
  • the edge 50 of the follower section 38 spreads downwardly and the edge 52 spreads upwardly giving an increasing degree of overlap between the follower sections.
  • a hollow product for example a hollow cylindrical product having a laminar glass fibre structure
  • the pusher arm 14 is moved at a uniform speed and pushes the hollow product in an axial direction, that is in the direction of arrow A in figure 1.
  • the cutting edges of the three blades 28, 30 and 32 cut through the wall of the product as it is advanced and produce three partial cuts in the wall of the product as shown in figure 6.
  • the cutting edge 46 of blade 28 cuts partially through the outside wall of the product to produce slit 60
  • the cutting edge 48 of blade 30 cuts partially through the inside well of the product to produce slit 62
  • the cutting edge of blade 32 partially cuts through the inside wall of the product to produce slit 64.
  • the partially slit prouct continues its axial movement and the thickened portion of the cutting sections 34,36 then pass through the slits 60,62 which have their inner ends adjacent to one another.
  • the thickened portions of the cutting sections 34,36 widen the slits 60,62 and in so doing exert forces in the matorial in the region of the adjacent inner ends of the slits 60,62 in a direction away from the planes of slits 60,62 and sufficient to fracture the thickness of the metonial between the inner ends of the slits 60,62 to prodance an intermediate step between those ends.
  • the resulting slit now has a Z profile, and the surfaces 66,68 of the material overlap at the stepped portion of the slit.
  • the product continues along its axial path past the follower sections 38 and 40 towards the region of the connecting part 29. If the surfaces 66,68 of the material at the intemediate step of the slit are to remain undamaged and smooth it is necessary to prevent the connecting part 29 from coning into contact with those surfaces. It is for this reason that the flared edges 50,52 are provided and as best seen in figure they exert radial shearing forces on the overlapping surfaces 66,68 to open up the slit so as to allow the connecting part 29 to pass between the overlapping surfaces 66,68 without causing them damage.
  • the resulting product has a longitudinal Z-profile slit through the whole of its wall and a longitudinal slit 64 partially through its wall.
  • the unfrectured material below the slit 64 acts like a hinge and enables the product to be opened and closed around a cylindrical pipe or conduit, the straight and smooth overlapping surfaces 66,68 coming into intimate contact and providing an effective air seal.
  • each blade can be integrated with one another or can be manufactured from separate parts.
  • each of the blades 28,30 can be manufactured from a respective single sheet of hardened steel, the line S merely being representative of that portion of the blade where the Z profile slit has been completely formed.
  • the cutting sections 34,36 can be made as separate hardened steel parts to that of the follower sections 38,40 which are made of mild steel.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Forests & Forestry (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)
  • Scissors And Nippers (AREA)
  • Processing Of Stones Or Stones Resemblance Materials (AREA)
  • Load-Engaging Elements For Cranes (AREA)
  • Superconductors And Manufacturing Methods Therefor (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
  • Control And Other Processes For Unpacking Of Materials (AREA)
  • Adornments (AREA)
  • Fertilizing (AREA)
  • Silver Salt Photography Or Processing Solution Therefor (AREA)
  • Chair Legs, Seat Parts, And Backrests (AREA)
  • Non-Silver Salt Photosensitive Materials And Non-Silver Salt Photography (AREA)
EP82301606A 1981-04-09 1982-03-26 Vorrichtung zum Schlitzen eines hohlen Gegenstandes Expired EP0063869B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT82301606T ATE19605T1 (de) 1981-04-09 1982-03-26 Vorrichtung zum schlitzen eines hohlen gegenstandes.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8111158 1981-04-09
GB8111158 1981-04-09

Publications (3)

Publication Number Publication Date
EP0063869A2 true EP0063869A2 (de) 1982-11-03
EP0063869A3 EP0063869A3 (en) 1983-08-17
EP0063869B1 EP0063869B1 (de) 1986-05-07

Family

ID=10521042

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82301606A Expired EP0063869B1 (de) 1981-04-09 1982-03-26 Vorrichtung zum Schlitzen eines hohlen Gegenstandes

Country Status (5)

Country Link
EP (1) EP0063869B1 (de)
AT (1) ATE19605T1 (de)
DE (1) DE3270958D1 (de)
DK (1) DK160182A (de)
NO (1) NO154625C (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2567791A1 (fr) * 1984-07-20 1986-01-24 Saint Gobain Isover Decoupe longitudinale d'un produit tubulaire fibreux
EP0391544A1 (de) * 1989-04-05 1990-10-10 Medamicus, Inc. Einführungs-Schlitzgerät
CN1042903C (zh) * 1992-08-27 1999-04-14 日东纺织株式会社 在无机纤维空心圆柱体内形成狭缝的方法及所用设备
US10697578B2 (en) 2015-10-22 2020-06-30 Technip France Method for assembling a rigid conduit and associated conduit

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH345206A (de) * 1956-05-29 1960-03-15 Ricefield Louis Selbsttätig sich einstellendes Lager
DE1815380A1 (de) * 1968-12-18 1970-07-23 Licentia Gmbh Spaltkerbeinrichtung fuer Blechbaender
FR2271006A1 (en) * 1974-05-17 1975-12-12 Saint Gobain Finned torpedo for slitting tubular profiles - for making wrap round insulation sleeve without generating dust
FR2281880A1 (fr) * 1974-08-15 1976-03-12 Ziristor Ab Procede pour former une lisiere attenante dans une bande en materiau composite

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH345206A (de) * 1956-05-29 1960-03-15 Ricefield Louis Selbsttätig sich einstellendes Lager
DE1815380A1 (de) * 1968-12-18 1970-07-23 Licentia Gmbh Spaltkerbeinrichtung fuer Blechbaender
FR2271006A1 (en) * 1974-05-17 1975-12-12 Saint Gobain Finned torpedo for slitting tubular profiles - for making wrap round insulation sleeve without generating dust
FR2281880A1 (fr) * 1974-08-15 1976-03-12 Ziristor Ab Procede pour former une lisiere attenante dans une bande en materiau composite

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2567791A1 (fr) * 1984-07-20 1986-01-24 Saint Gobain Isover Decoupe longitudinale d'un produit tubulaire fibreux
EP0170586A1 (de) * 1984-07-20 1986-02-05 Isover Saint-Gobain Längsschneiden eines Rohres mit Fasern
US4781089A (en) * 1984-07-20 1988-11-01 Isover Saint-Gobain Longitudinal cutting of a fibrous tubular product
EP0391544A1 (de) * 1989-04-05 1990-10-10 Medamicus, Inc. Einführungs-Schlitzgerät
CN1042903C (zh) * 1992-08-27 1999-04-14 日东纺织株式会社 在无机纤维空心圆柱体内形成狭缝的方法及所用设备
US10697578B2 (en) 2015-10-22 2020-06-30 Technip France Method for assembling a rigid conduit and associated conduit

Also Published As

Publication number Publication date
EP0063869B1 (de) 1986-05-07
EP0063869A3 (en) 1983-08-17
DK160182A (da) 1982-10-10
ATE19605T1 (de) 1986-05-15
NO154625B (no) 1986-08-11
NO154625C (no) 1986-11-19
DE3270958D1 (en) 1986-06-12
NO821131L (no) 1982-10-11

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