JPS57146622A - Manufacture of duct with lining - Google Patents

Manufacture of duct with lining

Info

Publication number
JPS57146622A
JPS57146622A JP56033014A JP3301481A JPS57146622A JP S57146622 A JPS57146622 A JP S57146622A JP 56033014 A JP56033014 A JP 56033014A JP 3301481 A JP3301481 A JP 3301481A JP S57146622 A JPS57146622 A JP S57146622A
Authority
JP
Japan
Prior art keywords
duct
electrode
dove
lining
tail grooves
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.)
Pending
Application number
JP56033014A
Other languages
Japanese (ja)
Inventor
Satoshi Hashimoto
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.)
Yokogawa Electric Corp
Original Assignee
Hokushin Electric Works Ltd
Yokogawa Hokushin Electric 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 Hokushin Electric Works Ltd, Yokogawa Hokushin Electric Corp filed Critical Hokushin Electric Works Ltd
Priority to JP56033014A priority Critical patent/JPS57146622A/en
Publication of JPS57146622A publication Critical patent/JPS57146622A/en
Pending legal-status Critical Current

Links

Classifications

    • 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
    • B29C63/00—Lining or sheathing, i.e. applying preformed layers or sheathings of plastics; Apparatus therefor
    • B29C63/48—Preparation of the surfaces
    • B29C63/481—Preparation of the surfaces mechanically

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Measuring Volume Flow (AREA)
  • Rigid Pipes And Flexible Pipes (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)

Abstract

PURPOSE:To obtain a duct with dove-tail grooves which keep firmly an insulative-lining on the inner surface of the duct by lining the duct with insulator, after the dove-tail grooves are fomed on the inner circumferential surface of the duct by electrospark machining. CONSTITUTION:A columnar electrode 4 is arranged on the upper part of a duct 1 such that the central axis of the electrode is coincident with the axis of the duct, and vertical movement of the electrode is made movable by a movement-mechanism. Eight protrusion 4a for forming grooves having trapezoidol-form are arranged along the axial direction on the peripheral surface of the electrode 4, and extend in the axial direction. The width of the protrusion section increases gradually in the direction from the electrode-periphery to the outer side. In this apparatus, firstly the electrode 4 is inserted into the duct 1. Simultaneously, electrical discharge between the electrode and the duct is caused to occur, and dove-tail grooves 1b correponding to the groove forming protrusions 4a and extending in the axial direction, are formed on the inner surface of the duct 1. Next, when the insulator lining 2 has been prepared on the internal surface of the duct 1, the lining duct with dove-tail grooves 1b may be obtained, and the dove-tail grooves are used for holding the insulator 2 and extend in the direction of the tube axis.
JP56033014A 1981-03-07 1981-03-07 Manufacture of duct with lining Pending JPS57146622A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56033014A JPS57146622A (en) 1981-03-07 1981-03-07 Manufacture of duct with lining

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56033014A JPS57146622A (en) 1981-03-07 1981-03-07 Manufacture of duct with lining

Publications (1)

Publication Number Publication Date
JPS57146622A true JPS57146622A (en) 1982-09-10

Family

ID=12374952

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56033014A Pending JPS57146622A (en) 1981-03-07 1981-03-07 Manufacture of duct with lining

Country Status (1)

Country Link
JP (1) JPS57146622A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61136086A (en) * 1984-12-06 1986-06-23 日立電線株式会社 Inner-surface coated treating pipe
CN105452816A (en) * 2013-08-12 2016-03-30 株式会社东芝 Electromagnetic flowmeter

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61136086A (en) * 1984-12-06 1986-06-23 日立電線株式会社 Inner-surface coated treating pipe
CN105452816A (en) * 2013-08-12 2016-03-30 株式会社东芝 Electromagnetic flowmeter

Similar Documents

Publication Publication Date Title
ES2005229A6 (en) Spark plug with surface discharge section.
DE3070626D1 (en) Method of wire-cut electric discharge machining
JPS57146622A (en) Manufacture of duct with lining
BR9502815A (en) High voltage isolator
IT8223488A0 (en) PROCEDURE FOR THE PRODUCTION OF A COMPOSITE ELECTRODE FOR SPARK PLUG AND ELECTRODE OBTAINED WITH SAID PROCEDURE.
DE1541005C3 (en) Electron discharge device
GB1454980A (en) Contact retention assembly
ATE3901T1 (en) SEALING RING.
JPS5550565A (en) Super high voltage discharging lamp
ES8704097A1 (en) Method of making a threaded insert.
ATE40767T1 (en) X-RAY TUBE WITH A CYLINDRICAL METAL PART SURROUNDING THE ANODE AND THE CATHODE.
JPS57166854A (en) Slip ring for electric machine
JPS53139045A (en) Bearing device
ES8604832A1 (en) Apparatus for generating electric discharges, particularly for the production of ozone.
JPS6444735A (en) Preparation of fishing rod
JPS6013233Y2 (en) Cable terminal
JPS55162851A (en) Manufacture of molded commutator
SU819896A1 (en) High-voltage thyristorized gate cell
JPS6364016B2 (en)
SU937125A1 (en) Tool-electrode
GB2053557B (en) Electron tube having electrode centering means
SU598724A1 (en) Electrode tool
US3932784A (en) Double section carbon electrode
JPS5214140A (en) Preparation method of the central electrode for the spark plug
JPS55150934A (en) Electrode holder for wire-cut electric discharge machining