JPS57137042A - Manufacture of tapered bar for coil spring - Google Patents

Manufacture of tapered bar for coil spring

Info

Publication number
JPS57137042A
JPS57137042A JP2237481A JP2237481A JPS57137042A JP S57137042 A JPS57137042 A JP S57137042A JP 2237481 A JP2237481 A JP 2237481A JP 2237481 A JP2237481 A JP 2237481A JP S57137042 A JPS57137042 A JP S57137042A
Authority
JP
Japan
Prior art keywords
rolls
tapered
rolled
rolling
intermediate material
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
JP2237481A
Other languages
Japanese (ja)
Other versions
JPS6351779B2 (en
Inventor
Akira Ono
Toyoyuki Tono
Tomohiko Ayada
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.)
NHK Spring Co Ltd
Original Assignee
NHK Spring Co Ltd
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 NHK Spring Co Ltd filed Critical NHK Spring Co Ltd
Priority to JP2237481A priority Critical patent/JPS57137042A/en
Publication of JPS57137042A publication Critical patent/JPS57137042A/en
Publication of JPS6351779B2 publication Critical patent/JPS6351779B2/ja
Granted legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21H—MAKING PARTICULAR METAL OBJECTS BY ROLLING, e.g. SCREWS, WHEELS, RINGS, BARRELS, BALLS
    • B21H7/00—Making articles not provided for in the preceding groups, e.g. agricultural tools, dinner forks, knives, spoons
    • B21H7/007—Taper rolling, e.g. leaf springs

Abstract

PURPOSE:To improve dimensional accuracy of slope and roundness by moving a bar material in longitudinal direction, rolling it to a tapered polygon by plural rolles, and rolling it to a tapered circular section by rotating plural rolls around the passage. CONSTITUTION:A bar material (a) is moved in longitudinal direction through a chuck 3 in rough forming process. Then, it is rolled by rolls 4 by pressing down rolls 4, 5 according to the amount of movement to make the sectional form near a square, and rolled by rolls 5 to make the sectional form an octagon. Thus, a tapered intermediate material (b) that has a round basal part and octagonal tip is formed. Next, in finishing process, a roll housing 7 provided with three drum- shaped rolls 9 is rotated around the moving passage of the intermediate material (b). The intermediate material (b) is rolled to tapered form having round section controlling the rolling reduction of rolls 9 according to the amount of movement.
JP2237481A 1981-02-18 1981-02-18 Manufacture of tapered bar for coil spring Granted JPS57137042A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2237481A JPS57137042A (en) 1981-02-18 1981-02-18 Manufacture of tapered bar for coil spring

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2237481A JPS57137042A (en) 1981-02-18 1981-02-18 Manufacture of tapered bar for coil spring

Publications (2)

Publication Number Publication Date
JPS57137042A true JPS57137042A (en) 1982-08-24
JPS6351779B2 JPS6351779B2 (en) 1988-10-17

Family

ID=12080857

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2237481A Granted JPS57137042A (en) 1981-02-18 1981-02-18 Manufacture of tapered bar for coil spring

Country Status (1)

Country Link
JP (1) JPS57137042A (en)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4838854A (en) * 1971-09-22 1973-06-07

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4838854A (en) * 1971-09-22 1973-06-07

Also Published As

Publication number Publication date
JPS6351779B2 (en) 1988-10-17

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