JPS6434748A - Needle pin and production thereof - Google Patents

Needle pin and production thereof

Info

Publication number
JPS6434748A
JPS6434748A JP19115587A JP19115587A JPS6434748A JP S6434748 A JPS6434748 A JP S6434748A JP 19115587 A JP19115587 A JP 19115587A JP 19115587 A JP19115587 A JP 19115587A JP S6434748 A JPS6434748 A JP S6434748A
Authority
JP
Japan
Prior art keywords
pin
tip end
end part
hardening
temperature
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
JP19115587A
Other languages
Japanese (ja)
Inventor
Shinichi Mizogami
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to JP19115587A priority Critical patent/JPS6434748A/en
Publication of JPS6434748A publication Critical patent/JPS6434748A/en
Pending legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/22—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of impact or pressure on a printing material or impression-transfer material
    • B41J2/23—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of impact or pressure on a printing material or impression-transfer material using print wires
    • B41J2/235—Print head assemblies
    • B41J2/25—Print wires

Landscapes

  • Impact Printers (AREA)
  • Heat Treatment Of Articles (AREA)

Abstract

PURPOSE:To obtain a superior needle pin enhanced in wear resistance and free from deformation, by a method wherein, in the pin of a high-speed steel, the hardness of the pin body part and tip end part, together with the shearing strength of the pin are specified. CONSTITUTION:A hardening treatment is applied overall to the pin of a high- speed steel at a normal hardening temperature, and the tip end part of the pin is heated and hardened for a short time at a temperature 50-200 deg.C higher than the aforesaid hardening temperature without being tempered. Thereafter, the pin is tempered overall. In the needle pin, its body part is Hv 850-950 in hardness and the tip end part is Hv 1000 or more in hardness and 400kg/mm<2> or more in shearing strength. Additionally, with a hardening temperature lower than the aforesaid to be applied to the tip end part of the pin, the components of an alloy carbide fail to dissolve into a matrix and the effect of the hardening cannot be obtained; on the other hand with a higher hardening temperature, particles become coarse to deteriorate the toughness. Namely, the tip end part of the pin is desirably hardened at a temperature of 1250-1400 deg.C.
JP19115587A 1987-07-30 1987-07-30 Needle pin and production thereof Pending JPS6434748A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP19115587A JPS6434748A (en) 1987-07-30 1987-07-30 Needle pin and production thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP19115587A JPS6434748A (en) 1987-07-30 1987-07-30 Needle pin and production thereof

Publications (1)

Publication Number Publication Date
JPS6434748A true JPS6434748A (en) 1989-02-06

Family

ID=16269817

Family Applications (1)

Application Number Title Priority Date Filing Date
JP19115587A Pending JPS6434748A (en) 1987-07-30 1987-07-30 Needle pin and production thereof

Country Status (1)

Country Link
JP (1) JPS6434748A (en)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5950741B2 (en) * 1978-06-12 1984-12-10 株式会社井上ジャパックス研究所 Alloy for wire electrodes for electrical discharge machining
JPS61147934A (en) * 1984-12-19 1986-07-05 Katsusato Fujiyoshi Manufacture of dot wire
JPS61173953A (en) * 1985-01-29 1986-08-05 Seiko Electronic Components Ltd Printing wire for dot printer

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5950741B2 (en) * 1978-06-12 1984-12-10 株式会社井上ジャパックス研究所 Alloy for wire electrodes for electrical discharge machining
JPS61147934A (en) * 1984-12-19 1986-07-05 Katsusato Fujiyoshi Manufacture of dot wire
JPS61173953A (en) * 1985-01-29 1986-08-05 Seiko Electronic Components Ltd Printing wire for dot printer

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