Method of producing press-forming punch and die
First Claim
1. A method of producing a press-forming die, comprising the steps of:
- preparing a master die and a master punch relatively movable toward and away from each other so as to define therebetween a die cavity;
relatively reciprocating the master die and the master punch together while a first blank sheet is disposed between the master die and the master punch, thereby press-forming the first blank sheet into a press-formed panel complementary in contour to the shape of the die cavity. while a second blank sheet is disposed between the in master die and the master punch, relatively reciprocating the master die and the master punch together with a stroke smaller than the stroke achieved when the press-formed panel is produced, thereby producing a half-pressed panel;
applying an elastic material onto one surface of the half-pressed panel which has been situated in face to face with the master die;
fitting the press-formed panel over the master punch and placing the half-pressed panel over the press-formed panel with the elastic material facing away from the press-formed panel;
forcing the half-pressed panel against the press-formed panel via the elastic material to thereby shape the half-pressed panel into a die panel complementary in contour to the shape of the press-formed panel; and
applying a back-up material to the rear surface of the die panel to thereby produce a press-forming die.
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Accused Products
Abstract
An economical method of producing a press-forming die is disclosed wherein a master die and a master punch are relatively reciprocated with a full stroke and a shorter stroke to produce a press-formed panel and a half-pressed panel. After an elastic material is applied to one surface of the half-pressed panel, the press-formed panel is fitted over the master punch, and the half-pressed panel is forced against the press-formed panel with the elastic material facing away from the press-formed panel, whereby the half-pressed panel is shaped into a die panel complementary in contour to the shape of the press-formed panel. A back-up material such as high-strength cement is then applied to the rear surface of the die panel whereby a press-forming die is produced.
7 Citations
22 Claims
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1. A method of producing a press-forming die, comprising the steps of:
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preparing a master die and a master punch relatively movable toward and away from each other so as to define therebetween a die cavity;
relatively reciprocating the master die and the master punch together while a first blank sheet is disposed between the master die and the master punch, thereby press-forming the first blank sheet into a press-formed panel complementary in contour to the shape of the die cavity. while a second blank sheet is disposed between the in master die and the master punch, relatively reciprocating the master die and the master punch together with a stroke smaller than the stroke achieved when the press-formed panel is produced, thereby producing a half-pressed panel;
applying an elastic material onto one surface of the half-pressed panel which has been situated in face to face with the master die;
fitting the press-formed panel over the master punch and placing the half-pressed panel over the press-formed panel with the elastic material facing away from the press-formed panel;
forcing the half-pressed panel against the press-formed panel via the elastic material to thereby shape the half-pressed panel into a die panel complementary in contour to the shape of the press-formed panel; and
applying a back-up material to the rear surface of the die panel to thereby produce a press-forming die. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method of producing a press-forming punch, comprising the steps of:
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preparing a master die and a master punch relatively movable toward and away from each other so as to define therebetween a die cavity;
relatively reciprocating the master die and the master punch together while a first blank sheet is disposed between the master die and the master punch, thereby press-forming the first blank sheet into a press-formed panel complementary in contour to the shape of the die cavity;
while a second blank sheet is disposed between the master die and the master punch, relatively reciprocating the master die and the master punch together with a stroke smaller than the stroke achieved when the press-formed panel is produced, thereby producing a half-pressed panel;
applying an elastic material onto one surface of the half-pressed panel which has been situated face to face with the master punch;
fitting the press-formed panel over the master die and placing the half-pressed panel over the press-formed panel with the elastic material facing away from the press-formed panel;
forcing the half-pressed panel against the press-formed panel via the elastic material to thereby shape the half-pressed panel into a punch panel complementary in contour to the shape of the press-formed panel; and
applying a back-up material to the rear surface of the punch panel to thereby produce a press-forming punch. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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Specification