JPS5514105A - Press roll piercing method - Google Patents

Press roll piercing method

Info

Publication number
JPS5514105A
JPS5514105A JP8401078A JP8401078A JPS5514105A JP S5514105 A JPS5514105 A JP S5514105A JP 8401078 A JP8401078 A JP 8401078A JP 8401078 A JP8401078 A JP 8401078A JP S5514105 A JPS5514105 A JP S5514105A
Authority
JP
Japan
Prior art keywords
bulge
out part
caliber
mandrel
rolls
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
JP8401078A
Other languages
Japanese (ja)
Other versions
JPS5856645B2 (en
Inventor
Seishiro Yoshihara
Hirokichi Higashiyama
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.)
Nippon Steel Corp
Original Assignee
Nippon Steel Corp
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 Nippon Steel Corp filed Critical Nippon Steel Corp
Priority to JP8401078A priority Critical patent/JPS5856645B2/en
Publication of JPS5514105A publication Critical patent/JPS5514105A/en
Publication of JPS5856645B2 publication Critical patent/JPS5856645B2/en
Expired legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B17/00—Tube-rolling by rollers of which the axes are arranged essentially perpendicular to the axis of the work, e.g. "axial" tube-rolling
    • B21B17/08—Tube-rolling by rollers of which the axes are arranged essentially perpendicular to the axis of the work, e.g. "axial" tube-rolling with mandrel having one or more protrusions, i.e. only the mandrel plugs contact the rolled tube; Press-piercing mills

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Forging (AREA)
  • Reduction Rolling/Reduction Stand/Operation Of Reduction Machine (AREA)

Abstract

PURPOSE:To improve thickness deviation in the vicinity of the rear end of round blank pipe easily, by bulging out the round blank pipe into the groove engraved in the caliber of press roll of the press piercing method, and fitting this bulge-out part to the roll disposed closely to the press roll exit side, and pushing back mainly around the mandrel. CONSTITUTION:A square bloom 4 is pressed in by means of a push-in device 10 in the axial direction between press rolls 1,1'disposed in the vertical direction, and a plug 3 is advanced into the bloom 4 to manufacture a round blank pipe 4'. In this case, a bulge-out part 6 having a specified bulge-out amounts is formed by means of at least one pair of grooves engraved opposedly to a caliber 2 of a roughly circular form of the rolls 1, 1'. Then, the bulge-out part 6 is pressed by means of rollers 14, 14' disposed closely to the rolls 1, 1' at the exit side of a piercer. Due to this pressing force F1, a force of F2 is applied to a mandrel 3' by way of pipe 4', and a force F3 directed to the center of the caliber 2 is applied to the plug 3 supported integrally to the mandrel 3', so that the thickness deviation of the pipe 4' may be improved as the retreat proceeds. At the same time, the bulge-out part 6 is formed with occuring no problem in next process.
JP8401078A 1978-07-12 1978-07-12 Press roll perforation method Expired JPS5856645B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8401078A JPS5856645B2 (en) 1978-07-12 1978-07-12 Press roll perforation method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8401078A JPS5856645B2 (en) 1978-07-12 1978-07-12 Press roll perforation method

Publications (2)

Publication Number Publication Date
JPS5514105A true JPS5514105A (en) 1980-01-31
JPS5856645B2 JPS5856645B2 (en) 1983-12-16

Family

ID=13818615

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8401078A Expired JPS5856645B2 (en) 1978-07-12 1978-07-12 Press roll perforation method

Country Status (1)

Country Link
JP (1) JPS5856645B2 (en)

Also Published As

Publication number Publication date
JPS5856645B2 (en) 1983-12-16

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