JPH1133655A - Method for integratedly forming projecting part - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the number of required deep drawing dies and the manufacturing cost by projecting a part of a flat area of a metallic plate from one surface side to the other surface side to form a spherical projecting part, and drawing and contracting a side part of the spherical projecting part parallel to the flat area to form a bottomed cylindrical part. SOLUTION: After an outer side surface of a flat area to form a blind cylindrical part of a work 1a is set at the prescribed position opposite to a spherical recessed part of a cam pat, a punch is operated toward the cam pat, and a spherical projecting part of the punch is abutted on an inner circumferential surface side of the flat area of the work 1a, and pressed thereagainst. After the spherical projecting part 15a is thus formed, the work 1a is taken out. Cylindrical dies 61-63 are successively and continuously pressed down using a deep drawing device 3, the spherical projecting part 15a is contracted in the radial direction by the inner circumferential surfaces 611-631 and inner circumferential surfaces 911-931 of the cylindrical punches 91-93 while relatively moved in the direction of the axis P, and at the same time, rolled in P direction to form the flind cylindrical part.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a projection forming method which can be used when a bottomed cylindrical projection is formed by deep drawing in a flat area of a metal plate.

[0002]

2. Description of the Related Art Conventionally, when a bottomed cylindrical projection is formed on a single metal plate, for example, a deep drawing method has been used. This deep drawing method uses a plurality of (three) drawing dies having different drawing diameters by a die and a punch.
This is to add stepwise drawing to a metal plate.

[0003]

According to the conventional deep drawing method, it is necessary to at least (1) form a bottomed cylindrical projection on the one metal plate as a workpiece to be deep drawn by at least Require three drawing dies. For this reason, it is difficult to reduce the equipment cost, and it is necessary to perform work such as setting a work to be drawn and taking out the work after drawing for each drawing die, and the number of steps is large. ,
The production cost of the obtained product is high. (2) Also, as a work to be deep-drawn, a bottomed cylindrical projection is deeply formed in a flat region of a metal plate container (fuel tank, oil pan, etc.) formed in advance into a three-dimensional shape (a shape having an accommodation recess). It is conceivable to form by drawing.

[0004] However, each drawing die for processing one metal plate cannot be used as it is unless it is modified so that a work to be deep drawn having a three-dimensional shape can be set. Remodeling each drawing die increases its cost and is disadvantageous in terms of equipment costs and manufacturing costs. Therefore,
In the conventional case, a separately manufactured tubular member is joined to a metal plate container by welding, brazing, or the like, which is disadvantageous in terms of quality such as poor joining.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and provides a method of integrally forming a projection which can reduce the number of deep drawing dies required for deep drawing of a bottomed cylindrical portion and reduce manufacturing costs. As an issue.

[0006]

According to the present invention, there is provided a method for forming a projection integrally with a projection, wherein a part of a flat region of a metal plate is extended from one surface to another surface to form a spherical projection. A squeezing step of squeezing a side portion of the spherical projection formed in the overhanging process in parallel with the flat region to reduce the diameter to form a bottomed cylindrical portion.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The overhanging step is performed as a pre-step prior to the drawing step, and a part of a flat area of a metal plate is overhanged from one side to the other side to form a spherical projection. In this overhanging step, it is possible to approach a position facing a female mold or a cam pad or the like having a spherical concave portion as a mold surface at a distance corresponding to the thickness of the metal plate with respect to the spherical concave portion. By using a male die or a punch having a projection as a mold surface, the spherical projection can be easily formed by holding a part of the flat area of the metal plate and pressing it with a predetermined pressure.

In the drawing step, the side of the spherical projection formed in advance in the projecting step is drawn in parallel to the flat area to reduce the diameter to form a bottomed cylindrical part. In this drawing step, since the side of the spherical projection formed in advance in the projecting step is drawn, for example, it can reciprocate along the longitudinal direction of the bottomed cylindrical part to be formed, and It is possible to use one deep drawing device which is held so as to be relatively movable with respect to each other and includes a plurality of dies and a plurality of punches arranged at concentric positions.

[0009] The thickness of the metal plate to be processed by the method of integrally forming a projection according to the present invention is 0.8 mm to 1.0 m.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The projection integral molding method according to the embodiment employs a bottomed cylindrical portion 15d which is the original shape of a cylindrical fuel inlet portion 15 of an upper housing 1A comprising a fuel tank 1 shown in FIG. 1 and a lower housing 1B. (See FIG. 5) is used to form the work 1a. The work 1a is of a concave shape pre-pressed using an iron plate material having a thickness of 0.8 mm, and is the same as the upper housing 1A except that the cylindrical fuel inlet 15 is not formed. It has a sloped top wall 10a which is shaped and shown in FIG. 1, and a peripheral wall 14a which is connected to the sloped top wall 10a and forms a lower opening 11a, a connection end 12a, an upper space 13a and the like.

The lower housing 1B, like the upper housing 1A, is a press-formed concave shape, forms substantially the lower half of the fuel tank 1, and is connected to the bottom wall 10b and the bottom wall 10b. Upper opening 11b, connecting end 12b,
It comprises a peripheral wall 14b forming a lower space 13b and the like.
In the projection integral molding method of the embodiment, the projecting step and the drawing step are performed on the flat region 100 of the inclined top wall portion 10a of the work 1a in this order.

(Overhanging Step) In the overhanging step, the overhanging device 2 shown in FIG. 2 is used. The overhanging device 2 has a cam pad 20 fixedly held by a holding member (not shown) and having a spherical recess 200, and a spherical protrusion 210 at a position facing the spherical recess 200 of the cam pad 20. And a punch 21 which is interlocked with a drive member (not shown) so as to be able to move toward and away from the spherical concave portion 200 so as to be able to come and go.

First, the outer surface (other surface) 102 of the flat region 100 on which the bottomed cylindrical portion 15d of the inclined top wall portion 10a is formed is fixed to the cam pad 20.
After being set at a fixed position facing the spherical concave portion 200, the punch 21 is operated toward the cam pad 20, and the spherical protrusion 210 of the punch 21 is moved to the flat area 1 of the workpiece 1a.
00 and is pressed with a predetermined pressure.

Then, the flat area 100 of the work 1 a pressed by the spherical projection 210 of the punch 21 is pushed out toward the spherical recess 200 of the cam pad 20,
The inner peripheral surface (one surface) 101 projects toward the outer surface (other surface) 102 side to form a spherical projection 15a. Thereafter, the punch 21 is moved in a direction away from the cam pad 20, and the work 1 a having the spherical projection 15 a is removed outside the overhanging device 2.

(Drawing Step) In the drawing step, the flat area 1 of the inclined top wall portion 10a of the work 1a is formed by the overhanging step.
00 (see FIG. 2).
A first drawing process, a second drawing process,
By continuously performing the third drawing step, a bottomed cylindrical portion 15d having a final shape (see FIG. 5) is formed.

Prior to the description of the drawing process, the deep drawing device 3 will be described with reference to FIG. The deep drawing device 3 includes an upper driving unit 4 and a lower driving unit 7. The upper drive unit 4 is composed of an upper rotating cam member 5 combined with each other, and a die group 6 which is reciprocally movable in the direction of the axis P (see arrows Y1 and Y2 in FIG. 6) and is provided concentrically with each other. Become. The upper drive unit 4 is capable of reciprocating (see arrows Y1 and Y2 in FIG. 6) as a whole in the direction of the axis P by a cylinder device (not shown), and moves toward and away from the lower drive unit 7. Can be.

The upper rotary cam member 5 is rotatably held by a holding member (not shown) and is provided with a large-diameter first upper cylindrical cam portion 51 provided concentrically on one surface 50 side, and a medium-diameter second upper cylinder. And a third upper cylindrical cam 53 having a small diameter. The upper cylindrical cam portions 51 to 53 have substantially the same shape except for a different diameter.
FIG. 7 shows only the upper cylindrical cam portion 51 in a perspective view from below.

The first upper cylindrical cam portion 51, the second upper cylindrical cam portion 52, and the third upper cylindrical cam portion 53 are shown by expanding a 360 ° circumferential region from the left side to the right side in FIG. As shown in the figure, the cam concave bottom portions a1, b1, and c1 each having a phase of 9 ° in each of three regions S equally spaced in the circumferential direction at 120 ° with the 0 ° position as the rotation start point S1.
Cam inclined portions a2, b2, c2 for forward movement (for movement of the cam group 6 in the direction of arrow Y1), and cam convex top portions a3, b
3, c3, and cam inclined portions a4, b4, and c4 for the reverse movement (for moving the cam group 6 in the direction of the arrow Y2) which are in the same phase (the rotation end point S2 coincides) by eliminating the phase. .

The height difference between the cam concave bottom portions a1, b1, c1 and the cam convex top portions a3, b3, c3 is substantially proportional to the depth h of the bottomed cylindrical portion 15d to be formed. Various settings can be made according to the depth h (see FIG. 5). Dice group 6
A movable holding member 60 having a guide hole 600 in the center,
The rotary cam plate 5 reciprocates along the axis P at a position facing the first upper cylindrical cam portion 51, the second upper cylindrical cam portion 52, and the third upper cylindrical cam portion 53 (arrows in FIG. 3). Y
1, Y2) possible large diameter first cylindrical die 61, medium diameter second cylindrical die 6 provided concentrically with each other
2, a small-diameter third cylindrical die 63, and an upper interlocking member 64 interposed therebetween and held by a holding member (not shown) so as to be able to reciprocate in the directions of the arrows Y1 and Y2,
65, 66, the movable holding member 60 and the first cylindrical die 6
1, the first cylindrical die 61 and the second cylindrical die 6
2, the second cylindrical die 62 and the third cylindrical die 6
3, coil springs 67, 68,
69.

The first cylindrical die 61 has a spherical surface 610 at its tip. The second cylindrical die 62 has a spherical surface 620 at its tip. The third cylindrical die 63 has a spherical surface 630 at its tip. The upper interlocking members 64, 65, 66
A first upper cylindrical cam portion 51, a second upper cylindrical cam portion 52, whose position changes according to the rotational position of the upper rotary cam member 5,
The cam concave bottom portions a1, b1, of the third upper cylindrical cam portion 53,
c1, cam inclined portions a2, b2, c2, cam convex top portion a
3, b3, c3, the first cylindrical die 61, the second cylindrical die 62, which is in contact with any of the cam inclined portions a4, b4, c4 and is urged by the coil springs 67, 68, 69. It has a function of transmitting the position change to the three cylindrical dies 63. Therefore, the first cylindrical die 61, the second
The reciprocating position along the axis P of the cylindrical die 62 and the third cylindrical die 63 is controlled by the amount of rotation of the upper rotary cam member 5. The amount of protrusion of the upper interlocking members 64, 65, and 66 in the direction of arrow Y1 Is determined by

The lower drive unit 7 reciprocates with the lower rotating cam member 8 combined with each other along the axis P (FIG. 3).
(See arrows Y1 and Y2) and a punch group 9 which is provided concentrically with each other. The lower rotating cam member 8 is
A medium-diameter first lower cylindrical cam portion 81, which is rotatably held by the fixed holding member 8a and is concentrically provided on one surface 80 facing the one surface 50 of the upper rotary cam member 5, and a small-diameter second lower cylinder. And a cam portion 82.

The first lower cylindrical cam portion 81 and the second lower cylindrical cam portion 82 have their respective 0 ° positions, as shown in FIG. 3 at equal intervals in the circumferential direction 120 ° as the rotation start point S1
For each of the divided areas S, the cam convex top portions a30 and b30 which are sequentially phase-shifted by 9 ° and the forward movement (arrow Y of the punch group 9).
The cam inclined portions a20 and b20 and the cam concave bottom portions a10 and b10 for the two directions (for movement in two directions) are displaced in the same direction (coincide with the rotation end point S2) for the backward movement (the arrow Y1 direction of the punch group 9). Cam inclined portions a40, b40
Are formed.

The height difference between the cam concave bottom portions a10 and b10 and the cam convex top portions a30 and b30 is substantially proportional to the depth h of the bottomed cylindrical portion 15d to be formed.
(See FIG. 5). Punch group 9
It is guided by the guide hole 800 of the fixed holding member 8a, and reciprocates along the axis P at a position facing the first lower cylindrical cam portion 81 and the second lower cylindrical cam portion 82 of the rotary cam plate member 8. (See arrows Y1 and Y2 in FIG. 3) The first cylindrical punch 91 having a medium diameter and the second cylindrical die 92 having a small diameter, which are provided concentrically with each other, are fixed to the center of the lower rotating cam member 8. The lower cylinders interposed between the fixed cylindrical member 93, the first lower cylindrical cam 81 and the first cylindrical punch 91, and the lower cylinders interposed between the second lower cylindrical cam 82 and the second cylindrical die 92, respectively. Interlocking members 94 and 95 are provided.

The first cylindrical punch 91 has a spherical surface 910 at its tip. The second cylindrical punch 92 has a spherical surface 920 at its tip. The fixed columnar member 93 has a spherical surface 930 set at the tip thereof. Further, between the outer peripheral surface 910 of the first cylindrical punch 91 and the inner peripheral surface 611 of the first cylindrical die 61, which move relative to each other along the axis P at positions facing each other via the workpiece 1a, The clearance between the outer peripheral surface 921 of the second cylindrical punch 92 and the inner peripheral surface 621 of the second cylindrical die 62 and the outer peripheral surface 931 of the fixed cylindrical member 93 and the inner peripheral surface 631 of the third cylindrical die 63 are: Is set to be approximately 1.2 times or more the thickness of the work 1a.

The lower interlocking members 94 and 95 are cam concave bottom portions a10 and b10 of the first lower cylindrical cam portion 81 and the second lower cylindrical cam portion 82 whose positions change according to the rotational position of the lower rotary cam member 8. A function of contacting any one of the cam inclined portions a20 and b20, the cam convex top portions a30 and b30, and the cam inclined portions a40 and b40 to transmit the positional change of the first cylindrical punch 91 and the second cylindrical punch 92. With.

Therefore, the reciprocating movement of the first cylindrical punch 91 and the second cylindrical punch 92 along the direction of the axis P is determined by the amount of protrusion of the lower interlocking members 94 and 95 in the direction of the arrow Y2. The drawing process using the deep drawing device 3 configured as described above will be described below. In the drawing step, as a preparation, as shown in FIG. 6, the upper drive unit 4 is moved in the arrow Y2 direction with respect to the lower drive unit 7 of the deep drawing device 3.

For this reason, the fixed holding member 8 of the lower drive unit 7
a and the movable holding member 6 of the upper drive unit 4 are held in a mold-open state in which they are located at an interval L. In this case, the upper drive unit 4 and the lower drive unit 7 are set in advance as follows. That is, the upper drive unit 4 is at a position where the movable holding member 60 and the die group 6 are closest to the upper rotary cam member 5, and the coil springs 67, 68, and 69 are in the most compressed state.

The upper interlocking member 64 is provided with the cam concave bottom portion a1 of the first upper cylindrical cam portion 51, and the upper interlocking member 65 is provided with the cam concave bottom portion b1 of the second upper cylindrical cam portion 52. In this state, the cam concave bottom portion c1 of the third upper cylindrical cam portion 53 is positioned on the upper interlocking member 66. Then, the first cylindrical die 61 and the second cylindrical die 6
2. The projecting amount of the third cylindrical die 63 in the direction of the arrow Y1 is in the smallest state.

The lower drive unit 7 includes a lower interlocking member 93.
The cam convex top portion a30 of the first lower cylindrical cam portion 81 is located at the second position, and the second lower cylindrical cam portion 82 is
In a state where the cam convex top portion b30 is located. Accordingly, the first cylindrical punch 91 and the second cylindrical punch 92 have the largest amount of protrusion in the arrow Y2 direction.

Next, a spherical projection 15a of the work 1a, which has completed the above-mentioned overhanging process, is set on the tip end side of the punch group 9 of the lower drive unit 7. In this state, as shown in FIG. 9, the upper drive unit 4 is moved in the direction of arrow Y1 and the lower drive unit 7 is moved.
And the movable holding member 60 and the fixed holding member 8a move the flat area 100 around the spherical projection 15a.
And the work 1a is fixedly held.

Thereafter, the upper rotating cam member 5 is moved to 0 ° in FIG.
In the process of rotating the lower rotary cam plate member 8 from the rotation start point S1 by shifting the timing from the start of rotation of the upper rotary cam member 5 in the process of rotating the position to the rotation end point S2 near 120 ° as the rotation start point S1. ° to a rotation end point S2 close to the first deep drawing step,
The second deep drawing step and the third deep drawing step are sequentially performed. That is, in the first deep drawing step, the rotation of the upper rotary cam member 5 causes the cam to move from the state where the cam concave bottom portion a1 of the first upper cylindrical cam portion 51 in FIG. The cam convex top portion a3 is located via the inclined portion a2.

For this reason, as shown in FIG.
The cylindrical die 61 is pushed down to the maximum. And the first
The inner peripheral surface 611 of the cylindrical die 61 and the first cylindrical punch 9
1 while being relatively moved in the direction of the axis P with the outer peripheral surface 911 of the workpiece 1, the diameter of the spherical projection 15a of the work 1a is reduced in the direction of the radius r, and the work is rolled in the direction of the axis P. It is formed as a part 15b (see FIG. 3).

In the second deep drawing step, the upper rotary cam member 5
The lower rotation cam plate member 8 is rotated with the rotation of. Then, the first upper cylindrical cam portion 5 is moved to the upper interlocking member 64.
The state where the first cam convex portion a3 is located is continued. At this time, from the state where the cam concave bottom portion b1 of the second upper cylindrical cam portion 52 is located with respect to the upper interlocking member 65, the cam convex top portion b3 is located via the cam inclined portion b2, and the second cylindrical die 62 is pushed down to the maximum. On the other hand, at the same time, the lower interlocking member 94 is
No. 1 cam concave bottom portion b1 is located and the first cylindrical punch 91
Is pushed down to the maximum (see FIG. 11).

For this reason, the first intermediate bottomed cylindrical portion 15b
(See FIG. 3) is an inner peripheral surface 621 of the second cylindrical die 62.
And the outer peripheral surface 921 of the second cylindrical punch 92, the diameter of which is reduced in the radius r direction, and the spherical surface 620 of the second cylindrical die 62 and the spherical surface 910 of the first cylindrical punch 91 in the direction of the axis P (arrow Y1 direction), and the second intermediate bottomed cylindrical portion 15
c (see FIG. 4).

In the third deep drawing step, the upper rotary cam member 5
And the lower rotating cam plate member 8 is rotated. Then, the state where the cam convex top portion a3 of the first upper cylindrical cam portion 51 is located with respect to the upper interlocking member 64 is continued, and the cam convex top portion of the second upper cylindrical cam portion 52 is positioned with respect to the upper interlocking member 66. The minute b3 is positioned, and the third cylindrical die 63 is pushed down to the maximum. At the same time, the lower interlocking member 94
On the other hand, the cam concave bottom portion b1 of the second lower cylindrical cam portion 82
0 is located and pushes down the second cylindrical punch 92 to the maximum (see FIG. 12).

For this reason, the second intermediate bottomed cylindrical portion 15c
(See FIG. 4) is an inner peripheral surface 631 of the third cylindrical die 63.
The outer peripheral surface 931 of the fixed cylindrical portion 93 is reduced in diameter in the direction of the radius r, and the spherical surface 630 of the third cylindrical die 63 and the spherical surface 920 of the second cylindrical punch 92 are rolled in the direction of the axis P. Is formed as a bottomed cylindrical portion 15d (see FIG. 5).

As described above, the method of integrally forming the protrusions according to the embodiment is as follows.
As described above, the overhanging step and the drawing step are performed in this order. Then, in the overhanging step, a part of the flat area 100 of the work 1a is moved from the one side 101 side to the other side 1 by using the overhanging device 2.
The spherical projection 15a can be formed by protruding toward the 02 side.

In the drawing process subsequent to the overhanging process, only one deep drawing device 3 is used.
By rotating the upper rotary cam member 5 and the lower rotary cam plate member 8 of the lower drive unit 120 by 120 ° in the circumferential direction,
The first deep drawing step, the second deep drawing step, and the third deep drawing step are quickly and quickly performed on the spherical projection 15a in this order, and the bottomed cylindrical part 15d can be formed.

Therefore, according to the projection integral molding method of the embodiment, when forming the bottomed cylindrical projection 15d, conventionally, a plurality of separately provided deep drawing dies were required. And only one deep drawing device 3 in addition to the overhanging device 2 can be used, and the equipment cost and the manufacturing cost can be reduced. In the case of forming the bottomed cylindrical portion 15d in the flat region 100 of the inclined top wall portion 10a of the concave work 1a which has been press-formed as a forming target used in the embodiment, for example, a conventional deep drawing Even if an attempt is made to use an apparatus or the like, the concave shape hinders the structure of the deep drawing apparatus itself, and it is difficult to set the apparatus at the processing reference position.

In this respect, according to the projection integral molding method of the embodiment, the set of the work 1a before the deep drawing and the work 1a after the deep drawing are applied to the single deep drawing device 3 in the mold open state. Can be easily removed. In the embodiment, the work 1a that has completed the overhanging process and the drawing process is a flat region 100 on which the fuel inlet portion is formed on the inclined top wall portion 10a.
The bottom portion 151 of the bottomed cylindrical portion 15d formed in the above is shot and pierced in the next step to be opened, and a bulge process is applied to the opening front end portion to expand the front end.
It is manufactured as an upper housing 1A having In the upper housing 1A having the fuel tubular portion 15, the connection end 12a and the connection end 14b of the lower housing 1B are integrally connected to form the fuel tank 1.

Further, since the fuel tubular portion 15 is formed integrally with the upper housing 1A, a conventionally manufactured tubular member is welded to a metal plate container in the conventional case, and the It is possible to eliminate disadvantages in quality, such as poor joining due to joining by attaching.

[0042]

According to the projection integral molding method of the present invention, a part of the flat area of the metal plate is extended from one side to the other side to form a spherical projection, and the projecting step includes: A reducing step of reducing the diameter of the side of the formed spherical projection parallel to the flat area to reduce the diameter to form a bottomed cylindrical part. Therefore, the following effects can be obtained. (1) It is possible to reduce the number of deep drawing molds required for deep drawing of the bottomed cylindrical portion and the manufacturing cost.

That is, in the overhanging step, a spherical projection can be easily formed in the flat region of the metal plate, and in the subsequent drawing step, the spherical projection formed in the overhanging step is previously subjected to deep drawing. Therefore, deep drawing is easy, and deep drawing can be performed by one deep drawing device, so that the bottomed cylindrical portion can be formed quickly. Therefore, the projection integral molding method of the present invention requires at least a plurality of (two to three) drawing dies by a conventional deep drawing method when forming a bottomed cylindrical portion long in the longitudinal direction. In addition, compared to the conventional deep drawing method, it is possible to reduce the number of work steps such as setting the work to be drawn and taking out the work after drawing, reduce equipment costs, reduce manufacturing costs, etc. . (2) Deep drawing is performed on a bottomed cylindrical projection in a flat region of a metal plate container (fuel tank, oil pan, etc.) that has been formed in advance into a three-dimensional shape (a shape having a housing recess) as a work to be deep drawn. In addition to the above, it is also possible to form a bottomed cylindrical projection on a single metal plate as a workpiece to be deep-drawn.

[Brief description of the drawings]

FIG. 1 shows an upper housing provided with a bottomed cylindrical portion formed by using the method of integrally forming a projection portion according to the embodiment, which is further subjected to a separate post-process (bulge processing) so that the bottom portion of the bottomed cylindrical portion is removed. Sectional drawing which shows the fuel tank to which the lower housing was joined after forming the cylindrical part which penetrated and penetrated and the front end was expanded.

FIG. 2 shows an overhanging step of the method of integrally forming the protrusions of the embodiment, and a part of a flat region of a metal plate is overhanged from one surface side to the other surface side by an overhanging device using a cam pad and a punch.
Sectional drawing which shows the case where a spherical protrusion is formed.

FIG. 3 shows a drawing step of the method of integrally forming the protrusions according to the embodiment, and narrows down the side of the spherical protrusion formed in the overhanging step in parallel to a flat area to reduce the diameter. FIG. 4 is a skeleton diagram showing a first drawing stage during formation of a portion.

FIG. 4 is a skeletal view showing a drawing step of the method of integrally forming the protrusions according to the embodiment, and showing a second drawing step in the middle of forming the bottomed cylindrical portion further following the first drawing step in FIG. .

FIG. 5 is a skeletal view showing a drawing step of the method of integrally forming the protrusions of the embodiment, and showing a third drawing step of forming a bottomed cylindrical part further reduced in diameter following the second drawing step in FIG. 4; .

FIG. 6 shows an open state of one deep drawing type used in the drawing step of the method of integrally forming the protrusions of the embodiment, and the spherical protrusion of the work formed in the overhanging step is a punch of the lower drive unit. Sectional drawing of the principal part which shows the state mounted and set in the group.

FIG. 7 is a perspective view showing a first cylindrical cam portion of one deep-drawing rotary cam plate used in a drawing step of the projection integral forming method of the embodiment, with a lower side perspective.

FIG. 8 is a developed view showing the relationship between the cylindrical cam portions formed on the upper rotary cam plate and the lower rotary cam plate in the deep drawing die by using the protrusion integral forming method of the embodiment, by developing the data by 360 °.

FIG. 9 is a diagram illustrating a state in which the deep drawing die is shifted from the state shown in FIG. 6 and the work is fixed and held by the fixed holding member of the lower driving unit and the movable holding member of the upper driving unit. Sectional drawing of a part.

FIG. 10 is a cross-sectional view of a main part showing a state where the deep drawing type is operated from FIG. 9, and a state where the first cylindrical die of the upper driving unit is moved down and the diameter of the work is reduced as shown in FIG. 3; .

FIG. 11 shows a state in which the deep drawing type is operated from FIG. 10, and the second cylindrical die of the upper driving unit and the first cylindrical punch of the lower driving unit are moved down, and the work is reduced as shown in FIG. Sectional drawing of the principal part which shows the state which was radiused.

FIG. 12 shows a state in which the deep drawing die has been operated from FIG. 11, and the third cylindrical die of the upper drive unit and the second cylindrical punch of the lower drive unit are moved down, and the work is shrunk as shown in FIG. Sectional drawing of the principal part which shows the state which was radiused.

[Explanation of symbols]

1a Work 15a Spherical projection 15b
1st middle bottomed cylindrical part 15c ... 2nd middle bottomed cylindrical part 15d ... bottomed cylindrical part

Claims (1)

[Claims] 1. A projecting step of projecting a part of a flat region of a metal plate from one surface side to another surface side to form a spherical projection, and a side of the spherical projection formed in the projecting step. A step of squeezing the portion in parallel with the flat region to reduce the diameter to form a bottomed cylindrical portion.