Metal deforming – By pulling workpiece through closed periphery die – With movement of discrete workpiece angularly – laterally – or...
Reexamination Certificate
2001-11-15
2003-10-21
Ostrager, Allen (Department: 3725)
Metal deforming
By pulling workpiece through closed periphery die
With movement of discrete workpiece angularly, laterally, or...
C072S285000, C072S283000
Reexamination Certificate
active
06634201
ABSTRACT:
CROSS-REFERENCE TO RELATED APPLICATION
This application claims priority of Japanese Application No. 2001-227555 filed Jul. 27, 2001 and Japanese Application No. 2001-010343 filed Jan. 18, 2001.
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a method and apparatus for drawing an elongated stock continuously through different dies.
2. The Prior Art
Heretofore, there has been known an elongated stock drawing apparatus for causing the elongated stock to pass through a die for reduction to a predetermined diameter. Such a conventional drawing apparatus is shown in
FIGS. 13 and 14
, which are a front view and a side view, respectively, of the drawing apparatus. The elongated stock drawing apparatus includes, as components shown in
FIG. 13
, a base
50
, dies
52
fixed onto the base
50
, a first moving means
56
having a chuck
54
and adapted to reciprocate horizontally on the base
50
, a swing means
62
with a rod
60
pivotally attached thereto, the rod
60
having a plug
58
at a front end thereof, a hydraulic cylinder
64
for moving the swing means
62
horizontally, the hydraulic cylinder
64
being fixed onto the base
50
, and a holder
68
for holding an elongated stock
66
at a predetermined position, the holder
68
being provided above the base
50
. The elongated stock
66
is in the shape of a cylinder, one end of which is formed with a flat portion
70
(flatwise crushed portion) as shown in FIG.
15
.
The elongated stock drawing apparatus includes, as components shown in
FIG. 14
, and in addition to the above components, a lower receptacle
72
disposed at a position lower than the base
50
on one side of the base, an upper receptacle
74
disposed at a position higher than the base
50
on another side of the base, and a transfer means
76
for transferring the elongated stock
66
from the lower receptacle
72
to the upper receptacle
74
.
The method for drawing the elongated stock members
66
with use of the elongated stock drawing apparatus will now be described. As shown in
FIGS. 13
,
14
, and
15
, a predetermined number (three in
FIG. 13
) of the elongated stock members
66
are put on the holder
68
which is in an inclined state. In this case, the elongated stock members
66
are put on the holder
68
in such a manner that the flat portion
70
thereof and a cylindrical opening thereof are positioned up and down, respectively. The swing means
62
has rods
60
in a number corresponding to the number of the elongated stock members
66
. The swing means
62
adjusts the angle of each rod
60
so that the rods are aligned with the elongated stock members
66
on the holder
68
. That is, the position of the plug
58
at the front end of each rod
60
is lifted higher than its horizontal position.
Next, a drive means (not shown) provided at an upper end of the holder
68
is driven to move an elongated stock member
66
downward with the cylindrical opening facing down and to receive, through its open end, the plug
58
on the front end of the rod. Thereafter, as shown in
FIGS. 13 and 15
, the swing means
62
causes the rod
60
to swing into a horizontal position so that a central axis of the rod
60
and the center of the die
52
are aligned with each other. Then, the hydraulic cylinder
64
is actuated to move the elongated stock member
66
toward the die
52
until the flat portion
70
of the elongated stock passes through the interior space of the die
52
and projects from the opposite side. At the same time, the first moving means
56
equipped with the chuck
54
moves toward the die
52
and the chuck
54
chucks the flat portion
70
of the elongated stock
66
. In this chucked state of the elongated stock
66
, the first moving means
56
moves to the side opposite the die
52
. As a result, the elongated stock member
66
passes through the die
52
and is thereby drawn into a predetermined diameter. The elongated stock member
66
thus drawn is received into the lower receptacle
72
as shown in FIG.
14
.
For drawing the elongated stock member
66
into a desired diameter, the stock
66
is subjected to a first drawing to a diameter a little larger than the desired diameter and is then subjected to a second drawing to the desired diameter which is relatively smaller. As the case may be, the elongated stock
66
is passed a total of three times or more through dies
52
of different diameters.
Since the elongated stock
66
is long and the lower and upper receptacles
72
,
74
are provided to the side of the elongated stock drawing apparatus, the area occupied by the drawing apparatus is large. For this reason, all of the working steps from the beginning to end are carried out using a single elongated stock drawing apparatus. For obtaining an elongated stock
66
of a desired diameter with use of a single elongated stock drawing apparatus, it is necessary that the die
52
and plug
58
used in the first drawing be replaced with smaller ones at the time of shift to the second drawing. This replacement work requires much time and a large number of working steps. The working steps before and after the die and plug replacement have already been automated, but the attainment of complete automation throughout requires automation of this replacing work.
In drawing, the distance X (
FIG. 15
) between a front-end position of the plug
58
inserted into the die
52
and an outlet position of the die
52
is very important in attaining high drawing accuracy and it is necessary to adjust the distance X with every replacement of the plug
34
. The distance X is visually checked. For checking the distance X with this apparatus, a worker is required to position his or her head in a region (region Y in
FIG. 15
) on the side opposite the rod
60
in the die
52
and to check the distance X visually. However, the holder
68
is an obstacle to positioning of the worker's head in region Y and thus it is difficult to visually check and adjust the distance X.
SUMMARY OF THE INVENTION
The present invention has been accomplished in view of the above and it is an object of the invention to provide a continuous drawing method and apparatus for an elongated stock member which permit plural types of drawings to be carried out, in an area narrower than that of the prior art, by a series of automated steps and which permit easy adjustment of the distance between the front-end position of the plug and the outlet position of the die.
For achieving the above-mentioned object, the continuous drawing method according to the present invention comprises providing a movable die holding member, with plural different types of dies being mounted at a central position relative to reciprocation of the elongated stock members, and with a large opening allowing the stock members to bypass the dies when moved from one side to the opposite side of the die holding member. The die holding member can also be positioned to allow the elongated stock members to be drawn through one set of the plural dies when the elongated stock is to be moved from one side to the other of the die holding member, causing the elongated stock to reciprocate plural times between the one side and the opposite side with the die holding member therebetween, and moving the die holding member at every passage of the elongated stock through one of the die sets to change the die type from one to another.
For achieving the foregoing object, the continuous drawing apparatus according to the present invention comprises a base, a die holding member movable with respect to the base and having plural different types of dies attached thereto, a chuck means for chucking the elongated stock, a first moving means for moving the chuck means toward the die holding member; the first moving means being provided on one side of the die holding member, a rod to be inserted into the elongated stock provided on the side opposite the first moving means with respect to the die holding member, and a second moving means for moving the rod toward the first moving means, whereby wh
Goetz John S
Nihon Shinkan Co., Ltd.
Ostrager Allen
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