GB788439A - Improvements in and relating to the profiling of tubular sections - Google Patents

Improvements in and relating to the profiling of tubular sections

Info

Publication number
GB788439A
GB788439A GB16297/54A GB1629754A GB788439A GB 788439 A GB788439 A GB 788439A GB 16297/54 A GB16297/54 A GB 16297/54A GB 1629754 A GB1629754 A GB 1629754A GB 788439 A GB788439 A GB 788439A
Authority
GB
United Kingdom
Prior art keywords
die
pegs
tube
gripped
mandrel
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.)
Expired
Application number
GB16297/54A
Inventor
Rudolf Francis Weiser
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.)
Stewarts and Lloyds Ltd
Original Assignee
Stewarts and Lloyds 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 Stewarts and Lloyds Ltd filed Critical Stewarts and Lloyds Ltd
Priority to GB16297/54A priority Critical patent/GB788439A/en
Publication of GB788439A publication Critical patent/GB788439A/en
Expired legal-status Critical Current

Links

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
    • B21C3/00—Profiling tools for metal drawing; Combinations of dies and mandrels
    • B21C3/02—Dies; Selection of material therefor; Cleaning thereof
    • B21C3/04—Dies; Selection of material therefor; Cleaning thereof with non-adjustable section
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/09—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/12—Articles with an irregular circumference when viewed in cross-section, e.g. window profiles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/30—Extrusion nozzles or dies
    • B29C48/32—Extrusion nozzles or dies with annular openings, e.g. for forming tubular articles

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Metal Extraction Processes (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
  • Shaping By String And By Release Of Stress In Plastics And The Like (AREA)

Abstract

788,439. Moulding tubes. STEWARTS & LLOYDS, Ltd. June 2, 1954, No. 16297/54. Class 87(2). [Also in Group XXII] Tubes of polyethylene &c. are formed to rectangular, triangular, D-shape, pear shape &c. sections by drawing through a die comprising a sizing part b<SP>1</SP>, Fig. 10, of the required final section which is merged into by a conical frustum entry portion a<SP>1</SP>. The major diameter D of the cone frustum is slightly larger than the outer diameter of the stock and the minor diameter s equals the smallest cross dimension of the product, the merge being obtained by removing proud edges at the intersection so that at any position 13, 17 along the die, a face b, Figs. 13, 17, forms a tangent to the curve of the conical frustum from a point at a corner of the final section. In operation the tangents b progressively close with the equivalent of a toggle action to force the material towards the corners. The tubes may be pulled or pushed through the die as by hydraulic cylinders and in one example the tube is alternately pushed by a hydraulic cylinder 3a, Fig 3, while gripped by a cross-head 5 and then pulled by a hydraulic cylinder 4 while gripped by a cross-head 6. The movement of the cylinders is so arranged that the work is continuously moved. In another example the tube is drawn through the die by the dog carriage of a drawbench. The tube is gripped internally by four pegs 2, Fig. 6, which extend radially towards the four corners of the square section die and are forced outwards by a conical mandrel 1 on the dog carriage to dig into the internal surface of the tube. The pegs are carried in a sleeve 3 which is moved longitudinally over the mandrel by a handle 6 through a link 5 to engage or release the grip. Springs 9 retract the pegs 2 when released and a stop 8 on the mandrel 1 engaged by the sleeve 3 limits the engagement of the pegs 2 with the work. The die is built up from a number of segments 6 adjustable by shims 5 and located between a thrust plate 7 and a cover plate 8.
GB16297/54A 1954-06-02 1954-06-02 Improvements in and relating to the profiling of tubular sections Expired GB788439A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB16297/54A GB788439A (en) 1954-06-02 1954-06-02 Improvements in and relating to the profiling of tubular sections

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB16297/54A GB788439A (en) 1954-06-02 1954-06-02 Improvements in and relating to the profiling of tubular sections

Publications (1)

Publication Number Publication Date
GB788439A true GB788439A (en) 1958-01-02

Family

ID=10074777

Family Applications (1)

Application Number Title Priority Date Filing Date
GB16297/54A Expired GB788439A (en) 1954-06-02 1954-06-02 Improvements in and relating to the profiling of tubular sections

Country Status (1)

Country Link
GB (1) GB788439A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102716934A (en) * 2012-06-18 2012-10-10 山西太钢不锈钢股份有限公司 Method for forming large-diameter stainless steel square tube

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102716934A (en) * 2012-06-18 2012-10-10 山西太钢不锈钢股份有限公司 Method for forming large-diameter stainless steel square tube

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