Metal deforming – With cutting – By composite tool
Reexamination Certificate
2000-03-03
2001-02-20
Crane, Daniel C. (Department: 3725)
Metal deforming
With cutting
By composite tool
C072S395000, C072S452900
Reexamination Certificate
active
06189361
ABSTRACT:
TECHNICAL FIELD
The present invention relates to a protrusion forming tool device which is mounted to a punch press such as a turret punch press so as to be used, and more specifically relates to a protrusion forming tool for cutting and protruding one portion of a surface of a plate workpiece by means of scratching process so as to form a small protrusion.
BACKGROUND ART
A prior example relating to the present invention is disclosed in Japanese Patent Application Laid-Open No. 9-85358, for example. As shown in
FIG. 10
, in this prior example, a punch driver
205
having a punch head
203
on its upper end is provided to a cylindrical punch guide
201
so as to be movable up and down. A substantially semicircular or substantially triangular blade member
207
having a cutting and protruding blade at its forward end is supported into the punch guide
201
in a position below the punch driver
205
via a pin
209
so as to revolve in a horizontal direction. Moreover, a force is applied to the blade member
207
by a force applying means
211
mounted into the punch guide
201
in a direction where the blade member
207
separates from an upper surface of a workpiece W.
In the above structure, a striker
213
which is provided to the punch press movably up and down strikes the punch head
203
and lowers the punch driver
205
against a stripper spring
215
. When a protruded portion
217
provided to a lower end of the punch driver
205
pushes the blade member
207
to a downward direction, the blade member
207
revolves about the pin
209
to the horizontal direction, and the cutting and protruding blade at the forward end of the blade member
207
cuts into the upper surface of the workpiece W supported to a die
219
. As a result, the upper surface of the workpiece W is scratched so that a small protrusion
221
is cut and protruded.
In the structure of the prior example, a force is applied to the blade member
207
by the force applying means
211
to the direction where the blade member
207
separates from the workpiece W, and the blade member
207
is mounted into the punch guide
201
via the pin
209
so as to revolve in the horizontal direction. For this reason, it is troublesome to work a pin hole into the punch guide
201
and to assemble the blade member
207
and the like into the punch guide
201
. Namely, there arises a problem that the working and assembly of the blade member
207
are troublesome.
In addition, since the protruded portion
217
which is provided to the lower end of the punch driver
205
pushes the blade member
207
directly to the downward direction, a height of a position where the punch head
203
is mounted to the punch driver
205
should be adjusted accurately so that the insufficient revolving of blade member
207
due to the cutting and protruding of the protrusion
221
does not occur. Namely, it is troublesome to adjust the mounting position of the punch head
203
.
Furthermore, since the blade member
207
is revolved about the pin
209
in the horizontal direction by the protruded portion
217
at the lower end of the punch driver
205
which moves up and down, a contact portion between the protruded portion
217
and the blade member
207
is gradually inclined, and a component of force for revolving the blade member
207
in the horizontal direction becomes weak gradually. As a result, there arises a problem when the protrusion
221
is cut and protruded and the forming accuracy of the protrusion
221
is improved.
DISCLOSURE OF THE INVENTION
The present invention has been achieved in order to solve the above conventional problems. According to a first claim of the invention, a protrusion forming tool for cutting and protruding a portion of a surface of a workpiece so as to form a protrusion by means of cooperation of a punch and a die, wherein the punch includes: a cylindrical punch guide which is supported to a punch holder in a punch press movably up and down; a punch driver provided to an upper portion of the punch guide, wherein the punch driver having a punch head at its upper end is movable up and down and is pushed upwardly; an up/down slider, wherein an inclined surface is provided on a lower surface of the up/down slider and wherein the up/down slider is provided in a position below the punch driver in the punch guide movably up and down; an elastic member, wherein the elastic member is provided between the up/down slider and the punch driver; a workpiece retainer, wherein the workpiece retainer is provided at a lower portion of the punch guide; and a punch body, wherein the punch body is provided in a position below the up/down slider in the punch guide so as to be movable up and down and movable in a radial direction of the punch guide and wherein a lower portion of the punch body can be protruded to a downward direction from the workpiece retainer, wherein the punch body is provided with a cutting and protruding blade at a lower end of the punch body for cutting and protruding the protrusion on the surface of the workpiece; and wherein the punch body is provided with an inclined surface on an upper surface of the punch body, and the inclined surface comes into surface-contact with the inclined surface formed on the lower surface of the up/down slider.
According to a second claim of the invention, in the invention depending from the first claim, the workpiece retainer has a guiding hole for guiding the punch body in the radial direction, and the workpiece retainer has a sliding-contact surface which slides and contacts with a sliding-contact surface formed on the lower portion of the punch body so as to limit a protruding amount of the punch body to the downward direction.
According to a third claim of the invention, in the invention depending from the first or second claim, the lower surface of the up/down slider is provided with a plurality of inclined surfaces having different inclined directions, wherein the inclined surfaces slide-contact respectively with other inclined surfaces which are provided on a plurality of upper surfaces of a plurality of punch bodies so that the plurality of punch bodies come close to and separate from each other.
According to a fourth claim of the invention, in the invention depending from the first, second or third claim, a punch tip which has the cutting and protruding blade is provided at a lower portion of the punch body detachably and changeably.
According to a fifth claim of the invention, in the invention depending from the fourth claim, the punch tip has a polygon shape such that cutting and protruding blades are provided on plural portions of the punch tip.
According to a sixth claim of the invention, in the invention depending from the first claim, the die is provided with a protecting member on an upper surface of the die, wherein the material of the protecting member is softer than a material of the die.
REFERENCES:
patent: 3713574 (1973-01-01), Lewis
patent: 3862561 (1975-01-01), Uebayashi
patent: 3971244 (1976-07-01), Zengerer
patent: 4557029 (1985-12-01), Stewart
patent: 5927136 (1999-07-01), Reynolds
patent: 160816 (1922-06-01), None
patent: 09085358 (1922-06-01), None
patent: 09122777 (1997-05-01), None
Iwamoto Masami
Seki Masayuki
Amada Metrecs Company Limited
Blank Rome Comisky & McCauley LLP
Crane Daniel C.
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