JPS5758928A - Precision blanking die - Google Patents

Precision blanking die

Info

Publication number
JPS5758928A
JPS5758928A JP13395880A JP13395880A JPS5758928A JP S5758928 A JPS5758928 A JP S5758928A JP 13395880 A JP13395880 A JP 13395880A JP 13395880 A JP13395880 A JP 13395880A JP S5758928 A JPS5758928 A JP S5758928A
Authority
JP
Japan
Prior art keywords
plate
die
projected line
material flow
hole
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
JP13395880A
Other languages
Japanese (ja)
Inventor
Iwao Mizutani
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 JP13395880A priority Critical patent/JPS5758928A/en
Publication of JPS5758928A publication Critical patent/JPS5758928A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE: To obtain an elliptical blank which is nearly a circular form with a circular punch or die that are easy to manufacture by modifying an annular projected line provided on a blank holder or die in a fine blanking type precision blanking die.
CONSTITUTION: An annular projected line 7 is so structured the height is selectively changeable along its circumferential direction. When a blank holder 4 is lowered, the projected line 7 presses a plate W to the upper surface of a die 2, and cuts into the plate to restrain the plate strongly around the die hole 3. Material flow equivalent to the volume that the projected line 7 cuts into the plate is formed in the plate by this cutting-in. At this time, material flow also occurs inward from the part restrained by the projected line 7 and consequently the plate W bends in the inside of the restrained part. The quantity of material flow differs along the circumferential direction of the hole 3, and the bending forms a part of an ellipsoid of revolution. After aobve-mentioned cutting in is made completely and the bottom face of the blank holder 4 comes into contact with the upper face of the plate, the punch 1 goes down and blanking of the plate W is effected jointly with the hole 3.
COPYRIGHT: (C)1982,JPO&Japio
JP13395880A 1980-09-25 1980-09-25 Precision blanking die Pending JPS5758928A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP13395880A JPS5758928A (en) 1980-09-25 1980-09-25 Precision blanking die

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP13395880A JPS5758928A (en) 1980-09-25 1980-09-25 Precision blanking die

Publications (1)

Publication Number Publication Date
JPS5758928A true JPS5758928A (en) 1982-04-09

Family

ID=15117049

Family Applications (1)

Application Number Title Priority Date Filing Date
JP13395880A Pending JPS5758928A (en) 1980-09-25 1980-09-25 Precision blanking die

Country Status (1)

Country Link
JP (1) JPS5758928A (en)

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