Title:
MANUFACTURE OF SPARK PLUG
Document Type and Number:
Japanese Patent JP3148931
Kind Code:
B2
Abstract:
PURPOSE: To simplify the manufacture of a ground electrode having a composite structure by winding a sheet outer sheath material on a cylindrical core material to form a composite round bar, and repeating drawing process and annealing process to form a wire composite material made small in diameter.
CONSTITUTION: A sheet outer sheath material 8 is wound on a cylindrical core material 7, and both the end parts of the outer sheath material 8 are welded to the core material 7 to form a composite round bar 9. The composite rotund bar 9 is subjected to drawing process and annealing process repeatedly to make the diameter small, and an alloy layer 10 is formed on the bonding critical surface between the core material 7 and outer sheath material 8 forming the composite round bar 9 to form a wire composite material 11. The composite material 11 is molded with a roller or a die so as to have roundness on the sectional rectangular four corners and cut into a determined dimension, and, further, the terminal of a molded material 12 is integrally bonded to the edge of a main metal fitting 5 by electric resistance welding. Thus, a ground electrode having a composite structure can be manufactured with a simple method, and the mass-production can be also performed.
Inventors:
Takafumi Ohshima
Tsutomu Okayama
Tsutomu Okayama
Application Number:
JP18165191A
Publication Date:
March 26, 2001
Filing Date:
June 27, 1991
Export Citation:
Assignee:
Nippon Special Ceramics Co., Ltd.
International Classes:
H01T13/32; H01T13/20; H01T21/02; (IPC1-7): H01T21/02; H01T13/20
Domestic Patent References:
| JP2281588A | ||||
| JP2127941A | ||||
| JP315184A |
Attorney, Agent or Firm:
Masahiko Yuasa