JPS55133824A - Boring method for machinery parts - Google Patents

Boring method for machinery parts

Info

Publication number
JPS55133824A
JPS55133824A JP3983979A JP3983979A JPS55133824A JP S55133824 A JPS55133824 A JP S55133824A JP 3983979 A JP3983979 A JP 3983979A JP 3983979 A JP3983979 A JP 3983979A JP S55133824 A JPS55133824 A JP S55133824A
Authority
JP
Japan
Prior art keywords
hole
parts
edge
boring
machinery parts
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
JP3983979A
Other languages
Japanese (ja)
Inventor
Masahiro Nakagawa
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.)
Toyota Motor Corp
Original Assignee
Toyota Motor 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 Toyota Motor Corp filed Critical Toyota Motor Corp
Priority to JP3983979A priority Critical patent/JPS55133824A/en
Publication of JPS55133824A publication Critical patent/JPS55133824A/en
Pending legal-status Critical Current

Links

Landscapes

  • Lubrication Of Internal Combustion Engines (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)

Abstract

PURPOSE: To reduce the notch fatigue factor of the edge part, to moderate the stress concentration, and to prevent the breaking of material and the decline of the fatigue strength, by finishing the hole edge of the mouth opening in the surface of the parts into a curved surface through the cold coining work, after applying the hardening treatment to the blank of the machinery parts and the boring treatment.
CONSTITUTION: In case of boring the oil hole 6' in the surface of the machinery parts, for example, the connecting part 4 of the connecting rod 1 of the automobile engine made of the high strength aluminum alloy, the countersink 7' is formed first of all. Next, after applying the hardening treatment to the parts 1, the hole 6' is drilled from the bottom of the countersink 7' toward the bearing hole 5. Hereby, the hole edge 9' is formed in the mouth 8' of the hole 6'. Next, the tip projection 11 of the shouldered mandrel 10 is inserted into the hole 6' and is pushed; hereby, the inclined side plane 12 of the tip projection 11 presses the hole edge 9' so as to form it into a moderately curved surface.
COPYRIGHT: (C)1980,JPO&Japio
JP3983979A 1979-04-04 1979-04-04 Boring method for machinery parts Pending JPS55133824A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3983979A JPS55133824A (en) 1979-04-04 1979-04-04 Boring method for machinery parts

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3983979A JPS55133824A (en) 1979-04-04 1979-04-04 Boring method for machinery parts

Publications (1)

Publication Number Publication Date
JPS55133824A true JPS55133824A (en) 1980-10-18

Family

ID=12564125

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3983979A Pending JPS55133824A (en) 1979-04-04 1979-04-04 Boring method for machinery parts

Country Status (1)

Country Link
JP (1) JPS55133824A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4819871A (en) * 1985-10-22 1989-04-11 Voest-Alpine-Friedmann Gesellschaft M.B.H. Process of manufacturing a fuel injection nozzle body and apparatus for carrying out the process

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4819871A (en) * 1985-10-22 1989-04-11 Voest-Alpine-Friedmann Gesellschaft M.B.H. Process of manufacturing a fuel injection nozzle body and apparatus for carrying out the process

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