JP2000288642A - Forming method of bottomed cylindrical container - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily regulate a plate thickness of a bottomed container at a low cost. SOLUTION: In forming a bottomed container by drawing, a slope-forming member 150 where a slope 154 of a roughly trancated cone side face shape is formed, while the side end face 120b of a plate material is brought into contact/is slid with the slope 154 and respective center axis of the slope 154 and a drawing hole 132 are roughly aligned, is moved in the direction of the expanding side of the slope 154, and then, the side end face 120b is drawn while being pressed in the direction toward the center axis of the slope 154. In this forming method, the vertical wall part of the bottomed cylindrical container is thickened together with drawing. Thus, the bottomed cylindrical container is formed with reducing a number of processes and in a short time, productivity of the bottomed cylindrical container is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of forming a bottomed cylindrical container from a substantially disk-shaped plate.

[0002]

2. Description of the Related Art As a forming method for forming a cylindrical container with a bottom from a substantially disc-shaped plate (disc blank), as shown in FIG. 18, a drawing having a column-shaped drawing hole into which a disc blank is drawn. A slot blank forming member (blank holder) and a squeezing means (punch) for squeezing the disc blank into the squeezing hole are used to close the disc blank on the peripheral surface of the squeezing hole. There is a method of forming a cylindrical container with a bottom by drawing a disc blank into the drawing hole by the drawing means (drawing method). In this molding method, the part (flange-shaped part) before being drawn into the narrowing hole of the disc blank is
A tensile stress is applied in the direction (radial direction) toward the center axis of the narrowing hole, and a compressive stress is applied in the circumferential direction. The narrowing hole is narrowed and deformed (radial drawing deformation).

In such a forming method, when a plate material having a small plate thickness is used, the plate material portion may be lifted on the peripheral surface or wrinkles may be generated on the surface of the plate material portion. Therefore, in order to prevent such a problem from occurring, as shown in FIG. 18, the plate member is pressed by a pressing member capable of pressing the plate material portion on the peripheral surface of the narrowed hole forming member against the peripheral surface. The aperture is narrowed down while being pressed against the peripheral surface of the aperture. In addition, the thickness of the flange-shaped portion can be controlled by the pressing member, and as a result, the thickness of the vertical wall portion can be easily controlled. Therefore, according to this molding method, when a flange portion is formed on the periphery of the opening of the container, the thickness of the flange portion can be easily controlled so as not to cause wrinkles.

In the forming method shown in FIG. 18, since the flange-like portion of the plate receives a tensile stress in the direction toward the center axis of the narrowing hole, the thickness of the portion may be reduced. is there. As a result, it becomes difficult to accurately control the thickness of each portion of the bottomed cylindrical container, for example, the thickness of the vertical wall portion and the flange portion becomes smaller than the bottom portion. Further, depending on the use of the bottomed cylindrical container, it may be desired to increase the thickness of the cylindrical portion (vertical wall portion) or the flange portion. Further, when a disk blank made of a brittle material such as a steel material having a high carbon content is used, cracking may occur due to tensile stress.

[0005] In particular, in a processing method in which the disk blank is pressed against the narrowing hole forming member by the pressing member to perform deep drawing, material flow to the gap between the pressing member and the narrowing hole forming member is suppressed. Therefore, it is difficult to increase the thickness of the flange portion. Therefore, conventionally, a method has been proposed in which the fluid pressure is applied to the side end surface of the disc blank to press the disc in the radial direction, thereby promoting the material flow of the disc blank and controlling the thickness of each part of the container. Have been. On the other hand,
A method has been proposed in which a plurality of cylinders and tapered cams are prepared, and the outer edge of the disc blank is pressed in the radial direction with the cams to control the thickness of each part of the container.

However, in the method of pressing with a hydraulic pressure, it is necessary to seal the hydraulic liquid acting on the side end surface of the disk blank in the processing device, so that the configuration of the processing device is complicated, and The manufacturing cost increases. As a result, the molding cost of the bottomed cylindrical container increases. On the other hand, in the method of pressing with a plurality of cylinders or cams, if each cylinder or each cam exerts a different pressing force on the side end surface of the plate material, a portion of the disk blank having a different slippage occurs, and the processing accuracy is reduced. May be done. Further, if the pressing force applied to the disc blank by each cylinder or each cam is too large, the applied portion is dented and irregularities are formed on the side end surface of the disc blank. In order not to form irregularities on the side end surfaces of the disc blank in this way, so that it is possible to apply a uniform and appropriate size of pressure to the side end surfaces of the plate material,
Means for controlling the pressing force of each cylinder or each cam is required. However, the provision of the control means increases the molding cost of the cylindrical container with a bottom.

Here, in anticipation of the formation of the uneven portion on the side end surface of the plate material, a large disk blank is prepared in advance in the radial direction, and the portion where the unevenness is formed is removed after drawing. There is also a method of finishing the bottomed cylindrical container into an accurate shape. However, in this method, the number of steps required for the removal increases, and the molding cost increases. Further, since it is necessary to additionally form a portion to be removed in the disc blank, the material cost of the disc blank increases. Further, the cost for processing such as disposal or recycling of the removed portion also increases. As a result, the molding cost of the bottomed cylindrical container increases.

On the other hand, as a method for molding a cylindrical container with a bottom having a flange portion at an opening, there has been conventionally a method of forming a flange portion by forming a cylindrical portion and then bending the tip portion outward. . However, in this method, when the tip of the vertical wall portion is bent, a tensile stress acts on the tip, so that a defect or a crack is generated due to a decrease in the thickness.

On the other hand, as a processing method for increasing the thickness of the cylindrical portion (vertical wall portion) of the bottomed cylindrical container, Japanese Patent Application Laid-Open No. Hei 6-21844 discloses
As disclosed in Japanese Unexamined Patent Publication No. 2 (1994), after forming a bottomed cylindrical container having an inwardly tapered surface at an end of a vertical wall portion, a corner having a radius of curvature smaller than the radius of curvature of the corner of the vertical wall portion. There is known a method of increasing the thickness of a vertical wall portion by applying pressure with an upsetting punch while pressing with a holding punch having a shape.

However, in this processing method, there is a problem that the cost of the mold increases because the structure of the mold is complicated. In addition, in addition to being processed in a closed space,
Since a large frictional force acts between the holding punch and the die and the vertical wall, deformation of the vertical wall is suppressed, so a large force is required for the pressing force applied to the vertical wall by the upsetting punch. Becomes In particular, in order to increase the thickness of the vertical wall evenly,
The pressing force requires an extremely large force. As a result, the cost for machining increases, such as the necessity of an upsetting punch capable of applying a large pressing force.

Further, a boundary portion (R portion) between the bottom portion and the vertical wall portion.
Since the pressing force acts from the end of the vertical wall portion in the depth direction of the bottomed cylindrical container before the plate thickness is increased, as shown in FIG. 19, folding occurs at the boundary portion. There is a possibility. There is a possibility that a crack may occur at the boundary due to the folding. Therefore, it is difficult to control the pressing force applied to the vertical wall portion by the upsetting punch, and there is also a problem that the cost for the control increases.

On the other hand, in the processing method disclosed in the above-mentioned publication, in addition to such a cost problem, it is impossible to increase the thickness of only the boundary portion.

[0013]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and provides a molding method capable of easily and inexpensively controlling the thickness of each portion of a bottomed cylindrical container. As an issue.

[0014]

According to a first aspect of the present invention, there is provided a method of forming a cylindrical container with a bottom, comprising a substantially columnar narrowing hole into which a substantially disk-shaped plate is narrowed. Using a narrowing hole forming member and narrowing means for narrowing the plate material into the narrowing hole, installing the plate material on the peripheral surface of the narrowing hole so as to close the narrowing hole, In a method of forming a bottomed cylindrical container by forming a cylindrical container with a bottom by narrowing a plate material into the narrowing hole by the narrowing means, the method has a through hole through which the narrow hole forming member can be inserted, and An inclined surface forming member having a substantially frustoconical side surface formed on a surface adjacent to the hole, the inclined surface and the narrowing down while the side end surface of the plate material is in sliding contact with the inclined surface over the entire circumference. By moving the center axes of the holes substantially in alignment with each other and moving the hole in the direction of the enlarged diameter side of the inclined surface, the side end surface is oriented toward the central axis of the inclined surface. And performing to narrow the while pressing the cormorants direction.

According to a second aspect of the present invention, there is provided a method of forming a bottomed cylindrical container according to the first aspect of the present invention, wherein the side end surface is perpendicular to the inclined surface. And moving the inclined surface forming member by sliding contact with the inclined surface. According to a third aspect of the present invention, there is provided a method of forming a bottomed cylindrical container according to the first or second aspect of the present invention. The outer edge portion is prevented from sliding in the moving direction by pressing means for pressing at least a part of the outer edge portion from the side of the inclined surface on the diameter increasing side.

According to a fourth aspect of the present invention, there is provided a method of forming a bottomed cylindrical container according to the present invention, wherein the pressing means comprises an outer edge of the plate member. A cooperating member that abuts at least a part of the portion and the inclined surface of the narrowing-down hole forming member, and moves along the inclined surface with the movement of the inclined surface forming member. And

According to a fifth aspect of the present invention, there is provided a method of forming a bottomed cylindrical container, comprising: forming a bottomed cylindrical container from a substantially disk-shaped plate; After fixing the bottom of the cylindrical container, the inclined surface has an insertion hole through which the bottomed cylindrical container can be inserted in the depth direction, and an approximately frustoconical side-shaped inclined surface is formed adjacent to the insertion hole. The forming member is moved along the central axis of the inclined surface in the direction of the diameter increasing side of the inclined surface while sliding the side end surface of the plate material on the inclined surface over the entire circumference, and moving the side end surface to the central axis. Forming the bottomed cylindrical container by plastically deforming the peripheral portion of the central portion by sliding the side end surface on the inclined surface in the direction of the diameter reduction side of the inclined surface while pressing in the direction toward It is characterized by.

According to a sixth aspect of the present invention, there is provided a method of forming a bottomed cylindrical container according to the present invention, wherein the peripheral portion is formed by reducing the slope. After being deformed in the radial direction so that the angle between the inclined surface and the central axis is smaller than the angle between the central portion and the peripheral portion, the side end surface is slid on the inclined surface. It is characterized by the following.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS [Method of Forming a Bottomed Cylindrical Container According to Claim 1] In the present invention, a side end surface of a substantially disk-shaped plate (hereinafter simply referred to as a plate) is positioned at the center of the inclined surface. Since the drawing is performed while pressing in the direction toward the axis, the thickness of the flange-shaped portion of the plate material can be increased. Therefore, the plate thickness of the vertical wall portion and the flange portion can be sufficiently increased. In particular, the thickness of the vertical wall portion and the flange portion of the bottomed cylindrical container can be made larger than the bottom portion.

As described above, conventionally, the step of increasing the thickness of the vertical wall portion is performed separately from the drawing process, but in the present invention, the thickness of the vertical wall portion is simultaneously reduced with the drawing process. Can be increased. Therefore, the number of steps can be reduced to form the bottomed cylindrical container in a short time, and the productivity of the bottomed cylindrical container can be increased. Also, as a plate material,
Even if a brittle material such as a steel material having a high carbon content is used, cracking can be prevented.

Applying pressure to the side end surface of the plate by means of the inclined surface forming member does not require a liquid seal as compared with the means for applying hydraulic pressure. Control of the configuration of the device and its operation can be facilitated. Therefore, the use of the inclined surface forming member can apply the pressure to the side end surface of the plate at a low cost, such as a reduction in the mold cost, rather than the means for applying the hydraulic pressure.

Further, since the pressing is applied to the side end face of the plate material over the entire circumference by the inclined surface forming member, a pressing force having a uniform magnitude can be easily applied to the side end surface of the plate material. Therefore, even if the pressing force becomes too large, no irregularities are generated on the side end surface. Therefore, the control of the pressing force is easier when the inclined surface forming member is used than when a cylinder or a tapered cam is used. As a result, it is possible to apply the pressure to the side end surface of the plate material at low cost.

For the above reasons, according to the method for forming a bottomed cylindrical container of the present invention, a bottomed cylindrical container can be formed easily and inexpensively from a plate material. A preferred embodiment of the method for forming a bottomed cylindrical container of the present invention will be described below.
The material of the substantially disk-shaped plate is not particularly limited, and a plate made of a metal material or the like can be used. Further, the plate material does not need to have an accurate disk shape, and may have an elliptical shape or the like. The material and plate thickness thereof can be appropriately selected according to the desired performance of the bottomed cylindrical container.

The narrow hole forming member is not particularly limited as long as it has a substantially columnar narrow hole into which the plate material can be narrowed, and a known narrow hole forming member can be used. . The narrowing means is not particularly limited as long as the plate can be narrowed down into the narrow hole of the narrow hole forming member, and a known narrowing means can be used. For example, the punch shown in FIG. 18 or hydraulic (hydraulic bulge forming)
Etc. can be used.

The shape and material of the inclined surface forming member are not particularly limited, but may be, for example, those having the shapes shown in FIGS. FIG. 1 shows an inclined surface having a tapered cross section. 2 and 3 show that the inclined surface has a curvature with respect to the direction of the diameter increasing side. The curvature is not particularly limited, but is preferably selected appropriately so that the plate can slide. As for the material of the inclined surface forming member, it is preferable to select a material that has excellent slipperiness and can withstand contact stress with the plate material so that at least the surface portion of the inclined surface can easily slide the plate material. .

In the present invention, the inclined surface forming member may be moved by being pulled from the side of the inclined surface on the diameter increasing side,
You may move by pressing from the direction of the diameter reduction side of an inclined surface.
Alternatively, an engaging portion that can engage with the belt may be provided on the side surface, and the inclined surface forming member may be moved by the belt.
Further, it is preferable that the inclined surface forming member is provided with a sliding portion which can slide on the outer peripheral surface of the narrowed hole forming member. With this sliding portion, the inclined surface forming member can be moved stably.

Further, a frictional force acts on the side end surface of the plate material from the inclined surface of the inclined surface forming member, so that the outer edge of the plate material slides in the direction of the diameter increasing side of the inclined surface. If the sliding length is sufficiently small, a pressing force can be effectively applied to the side end surface of the plate from the inclined surface of the inclined surface forming member.
However, if the sliding length is large, the angle between the side end surface and the inclined surface changes greatly, and it becomes impossible to effectively apply a pressing force to the side end surface of the plate from the inclined surface. Therefore, to make the sliding length sufficiently small,
It is preferable to appropriately select the moving speed of the inclined surface forming member.

The method for molding a cylindrical container with a bottom according to the present invention can be carried out using the following molding apparatus. The forming apparatus includes a narrowed hole forming member having a substantially cylindrical narrowed hole through which a substantially disk-shaped plate material is narrowed, and narrowing means for narrowing the plate material into the narrowed hole. Is installed on the peripheral surface of the narrowing hole so as to close the narrowing hole, and the plate material is narrowed into the narrowing hole by the narrowing means to form a bottomed cylindrical container. In the container molding device, an inclined surface forming member having an insertion hole through which the narrowed hole forming member can be inserted, and an approximately frustoconical inclined surface formed on a surface adjacent to the insertion hole is provided. The inclined surface and the narrowed hole are provided so as to be able to reciprocate with their respective central axes substantially coincident with each other, and the inclined surface is slidably in contact with the side end surface of the plate material over the entire circumference along the central axis of the hole. Moving in the direction of the diameter increasing side of the inclined surface, the side end surface is pressed in the direction toward the central axis of the inclined surface. To narrow reluctant said, characterized in that is carried out. (Example 1) As such a molding apparatus, for example, a molding apparatus shown in FIG. 4 can be mentioned.

In the molding apparatus illustrated in FIG. 4, a disk-shaped plate member 120 is provided between an upper die 110 attached to a ram (not shown) of a press and movable vertically and a fixed lower die 112. A narrowing hole forming member 130 having a columnar narrowing hole 132 into which the sheet material is narrowed, narrowing means 140 for narrowing the plate member 120 into the narrowing hole 132, and an insertion hole 152 through which the narrowing hole forming member 130 can be inserted. An inclined surface forming member 150 having a substantially frustoconical side surface-shaped inclined surface 154 is provided adjacent to the insertion hole 152.

In this forming apparatus, the narrowing means 140 is formed of a columnar metal and has the same shape as the vertical wall of the cylindrical container with a bottom in the narrow hole 132 of the narrow hole forming member (blank holder) 130. The first punch which can be inserted at a cylindrical interval is used. This first punch 1
The upper mold 40 can move up and down freely in the narrowing hole 132 of the blank holder 130 by moving the upper die 110 up and down, and can apply a pressing force of any magnitude in the direction of its tip.

The blank holder 130 is a cylindrical metal member. This blank holder 130 is also a rod 1
It can be moved up and down freely by a hydraulic control cylinder (not shown) connected via 34, and a pressing force of any magnitude can be applied in the direction of its tip (peripheral surface 330a). Inclined surface forming member (taper punch)
Reference numeral 150 denotes a substantially cylindrical metal member including a sliding portion 150a that slides on the outer peripheral surface 130b of the blank holder 130 and an inclined surface portion 150b having an inclined surface 154. This taper punch 150 is attached and fixed to the lower mold 112.

By operating this forming apparatus as follows, a cylindrical container with a bottom can be formed from a disk-shaped plate. First, the positions of the blank holder 130 and the taper punch 150 are set to the positions shown in FIG. On the other hand, the plate material is made of metal material,
A circular blank 120 whose outer edge 120a is plastically deformed as shown in FIG. 4A is prepared. The circular blank 120 is placed on the peripheral surface 130 a of the blank holder 130 so as to close the narrowing hole 132, and the side end surface 120 b is slidably contacted with the inclined surface 154 of the taper punch 150.

Next, after the first punch 140 is brought into contact with the center of the circular blank 120, the first punch 140 and the blank holder 130 are simultaneously lowered. At this time, the first punch 140 is lowered at a higher speed than the blank holder 130. As a result, the circular blank 120
Is pressed downward by the first punch 140.
Further, the taper punch 150 rises relatively to the blank holder 130.

Thus, the inclined surface 1 of the taper punch 150
54, the side end surface 120b of the circular blank 120 is slid over the entire circumference, and the tapered punch 150 is
4 is moved in the direction of the diameter increasing side. As a result, the circular blank 120 has a tapered punch 150 at its side end surface 120b.
While being pressed in the direction toward the central axis of the inclined surface 154 of FIG. (Modification) In the method of forming a cylindrical container with a bottom according to the present invention, it is preferable to perform the narrowing while pressing the plate material against the peripheral surface of the narrowing hole of the narrowing hole forming member. This makes it possible to prevent the plate material from floating on the peripheral surface of the narrowed hole. In addition, the occurrence of wrinkles can be prevented. The pressing means is not particularly limited as long as the plate can be pressed against the peripheral surface of the narrowing hole of the narrowing hole forming member, and a known pressing means can be used.

For example, in the molding apparatus shown in FIG. 4, a substantially perforated circular plate-shaped pressing member (second pressing member) as shown in FIG.
Punch) 160 (having a hole 162 at the center thereof into which the first punch 140 is inserted) can be provided. When the drawing hole forming member (blank holder) exerts a pressing force on the plate material 120, the plate material 120 is pressed against the peripheral surface 134 of the drawing hole forming member 130 relatively by the second punch 160. Works.

In this forming apparatus, when the plate material 120 is squeezed, a pressing force is applied from the inclined surface 154 of the inclined surface forming member 150 to the side end surface 120b. The material flow to the gap 164 is promoted, and the elongation of the plate member 120 can be suppressed. Therefore, the thickness of the bottom portion 122, the vertical wall portion 124, and the flange portion 126 can be made uniform, and accurate control of the thickness of each portion of the bottomed cylindrical container becomes easy.

In the method of forming a cylindrical container with a bottom according to the present invention, it is preferable that the side end surface is vertically slid on the inclined surface to move the inclined surface forming member. Thereby, the pressing force can be effectively applied to the side end surface of the plate material from the inclined surface. In the above-described molding apparatus, the following two methods can be cited as a method for vertically sliding the side end surface on the inclined surface.

One is that the outer edge of the plate is plastically deformed in advance into the shape shown in FIG. 4, and the plate is pressed against a narrowing hole forming member with a pressing member and then fixed to the inclined surface. This is a method in which the side end faces are slid vertically. In this case, when the plate is punched as a blank, the outer edge of the plate may be plastically deformed. The other is to press a flat plate material against the narrowing hole forming member with a pressing member and fix it. After deforming the outer edge portion into the shape shown in FIG. 4, the side end surface is slid vertically on the inclined surface. It is a way to make it. At this time, the outer edge portion may be deformed using a pressing member described later, or may be deformed using a member different from the pressing member. Any deformation may be a plastic deformation or an elastic deformation.

As a method for suppressing the outer edge of the plate material from sliding in the direction of the larger diameter of the inclined surface of the inclined surface forming member, there is a method of appropriately selecting the moving speed of the inclined surface forming member. Some things have been mentioned earlier. But with this method,
Control means for appropriately controlling the moving speed of the inclined surface forming member is required, and the molding apparatus may be complicated, and the molding cost may be increased.

On the other hand, as means for suppressing the sliding of the outer edge portion in the direction toward the diameter increasing side of the inclined surface, there may be mentioned another means for pulling in the direction toward the diameter decreasing side of the inclined surface. Here, the pulling means is not particularly limited, but for example, it can be pulled using a suction means or a magnet. In the pulling means using this magnet, the outer edge portion can be pulled in the direction of the diameter reduction by embedding a magnet in the surface of the sloped surface forming member in the direction of the diameter reduction. However, even with the suction means, there is a possibility that the molding device is complicated and the molding cost is increased. Also,
The tension means using a magnet may not be used depending on the material of the plate material.

Therefore, the outer edge of the plate is slid in the direction of the enlarged diameter of the inclined surface by a pressing means for pressing at least a part of the outer edge of the plate from the direction of the enlarged diameter of the inclined surface. Is preferably suppressed. By this pressing means,
The sliding of the outer edge portion in the moving direction can be suppressed without complicating the molding device and irrespective of the material of the plate material. As a result, the angle between the side end surface and the inclined surface can be kept constant. As a result, a pressing force can be effectively applied to the side end surface of the plate material from the inclined surface.

The form of the pressing means is not particularly limited, and the outer edge of the plate may be pressed using any material of gas, liquid and solid (if gas or liquid is used, the outer edge of the plate may be pressed). The outer edge is pressed with atmospheric pressure or liquid pressure.) However, it is necessary to select the form so as not to hinder the movement of the inclined surface forming member. Further, the pressing means is in contact with a part of the outer edge of the plate member and the inclined surface of the narrowing hole forming member, and along the inclined surface along with the movement of the inclined surface forming member. It is preferable to use a moving cooperating member. For example, in the molding apparatus shown in FIG.
The inclined surface 154 having a rolling mechanism as shown in FIG.
A cooperating member 170 that rolls over can be used. Further, in the forming apparatus shown in FIG. 5, a cooperating member 172 or the like sliding on the inclined surface 154 as shown in FIG. 7 can be used.

The cooperating member 170 shown in FIG. 6 is capable of freely expanding and contracting, and is in contact with a substantially rod-shaped base 170a attached at its base end to the upper die 110 so as to be capable of pendulum movement, and an inclined surface 154. And a tip 170 having a rolling mechanism
b. The cooperating member 170 includes a part of the outer edge portion 120 a of the plate member 120 and the narrowing hole forming member 15.
0, and abuts against the inclined surface 154 and the inclined surface forming member 150.
Can roll on the inclined surface 154 with the movement of.

The cooperating member 172 shown in FIG. 7 is attached to a hole 166 provided on the surface of the pressing member 160 ′ facing the peripheral surface 130 a of the narrowing hole forming member 130, and the inclined surface 154 is provided. A sliding portion 172b having a tapered surface 172a slidably contacting the hole 166 and capable of sliding in the hole 166, and a coil spring (not shown) for sliding the sliding portion 172b in the hole 166. I have. This cooperating member 172
Is in contact with a part of the outer edge 120a of the plate member 120 at the sliding surface 172a of the sliding portion 172b,
The lower surface 172c of the lower surface 2b abuts on the inclined surface 154 of the narrow hole forming member 150, and can slide on the inclined surface 154 as the inclined surface forming member 150 moves.

By pressing the outer edge portion of the plate material over the entire circumference by the pressing means, the outer edge portion can be prevented from sliding evenly over the entire circumference in the direction toward the radially enlarged side of the inclined surface. However, since the outer edge of the plate material is reduced in diameter as the drawing is advanced, it is difficult for the pressing means using the cooperating member (solid) to press the outer edge over the entire circumference while corresponding to the reduced diameter. . That is, a part that cannot be pressed occurs at the outer edge. as a result,
In the portion of the outer edge portion that is not pressed by the pressing means, the sliding in the moving direction of the inclined surface forming member cannot be suppressed. However, if a contracting material is used as the pressing means, it is possible to cope with the contraction of the outer edge of the plate material, but it is difficult to press the outer edge with a sufficient pressing force.

Therefore, it is preferable that the cooperating member orbits all around the outer edge of the plate.
By using such a cooperating member as the pressing means, it is possible to easily press the outer edge of the plate material over the entire circumference without bias. As such a cooperating member, for example, the one shown in FIG. The cooperating member 17 shown in FIG.
4 is a tapered surface 17 attached to a hole 168 provided in the surface of the pressing member 160 ′ facing the peripheral surface 130 a of the narrowing hole forming member 130, and abutting against the inclined surface 154.
4a, which can slide in the hole 168 and can rotate by receiving torque;
A coil spring (not shown) that slides the sliding portion 174b through the hole 168 is provided. On the other hand, in the molding apparatus shown in FIG. 6, the lower mold 112 'can be freely rotated with respect to the center axis of the inclined surface 154 of the inclined surface forming member 150. Further, the tapered punch 150 can slide not only in the vertical direction but also in the circumferential direction with respect to the outer peripheral surface 130a of the blank holder 130.

Therefore, the cooperating member 174 has the sliding portion 1
It can rotate by receiving torque from the lower mold 112 from the tapered surface 174a contacting the inclined surface 154 of the base 74b.
By this rotation, the cooperating member 174 can be made to orbit around the outer edge portion 120a of the plate member 120 over the entire periphery while sliding the cooperating member 174 against the inclined surface 154. On the other hand, it is preferable to form a notch in at least one outer edge of each of the opposing surfaces of the narrowing hole forming member and the pressing member. By forming such a notch, in the interval (the interval between the plate members) formed by the narrowing hole forming member and the pressing member, the outer edge portion has a larger interval width than other portions. Can be formed. When the flange portion is formed in the bottomed cylindrical container, if such an interval is provided, the material flow in the plate material due to the pressing of the inclined surface occurs at the outer edge portion 126a of the flange portion 126,
Since the deformation is restricted by the narrowing hole forming member and the pressing member, a thick portion (thick portion) can be formed at the outer edge portion 126a.

The shape of such a thick portion is, for example, as shown in FIG.
A desired shape can be obtained by forming a notch 134 of an appropriate shape over the entire periphery of the outer edge of the surface facing the zero pressing member (second punch) 160 '. The thick portion may be formed over the entire periphery of the outer edge portion 126a, or may be formed on a part of the outer edge portion 126a, provided that the formation site is appropriately selected according to the application. Good. Example 2 In this example, a cylindrical container with a bottom was formed from a disk-shaped plate using the forming apparatus shown in FIG.

The molding apparatus shown in FIG. 9 has a cylindrical narrow hole 232 into which a disk-shaped plate 220 is narrowed between an upper die 210 movable in the vertical direction and a fixed lower die 212. The narrow hole forming member (blank holder) 230, narrowing means (first punch) 240 for narrowing the circular blank 200 into the narrow hole, and a plate member 200 attached to the upper die 210.
Of the narrowing hole 232 of the blank holder 230
(Second punch) 250 that presses the blank holder 230 and an insertion hole 262 through which the lower part of the blank holder 230 and the second punch 250 are inserted, and a substantially frustoconical side surface inclined surface adjacent to the insertion hole 262. This is an apparatus provided with an inclined surface forming member (taper punch) 260 on which a surface 264 is formed.

The blank holder 23 in this molding apparatus
The 0, first punch 240 and taper punch 260 are the same members as those of the molding apparatus illustrated in FIG. 4 earlier. In addition, in the narrowing hole 232 of the blank holder 230,
A knockout 270 that can slide in the narrowing hole 232 and that comes into contact with the center of the plate member 220 from below at the tip is provided. The knockout 270 is a columnar metal member, and can be freely moved up and down by a hydraulic control cylinder (not shown) connected via a rod 272, and the plate member 220 abutted on the tip thereof. The pressing force of any magnitude can be applied to

The peripheral surface 23 of the blank holder 230
0a, a notch 234 is formed all around the outer edge thereof.
Are formed. Therefore, the interval (plate material 220) formed between the blank holder 230 and the second punch 250
Has a larger interval width on the blank holder side at the outer edge portion than the other portions. Further, in the upper die 210, in the cooperating member 170 shown in FIG.
A cooperating member 2 provided with a rolling mechanism that enables the upper part to make a round.
80 was attached. In this molding apparatus, the upper mold 21
0 can be freely rotated with respect to the center axis of the inclined surface 264. Therefore, this cooperating member 280 is also
10, the outer edge 2 of the plate member 220 while rotating against the central axis of the inclined surface 264 so as to contact the inclined surface 264.
20a.

By operating the forming apparatus shown in FIG. 9 as follows, a cylindrical container with a bottom can be formed from a disk-shaped plate. First, the positions of the blank holder 230, the taper punch 260, and the knockout 270 are shown in FIG.
Each is set at the position shown in FIG. On the other hand,
As a disk-shaped plate material, made of a metal material and having an outer edge portion 2
As shown in FIG. 9A, a circular blank 220 that has been plastically deformed is prepared. This circular blank 220
Is installed on the peripheral surface 230a of the blank holder 230 so as to close the narrowing hole 232, and then the side end surface 2
The second punch 250 presses the second holder 250 against the blank holder 230 such that the second holder 20 b slides vertically on the inclined surface 264 of the taper punch 260.

Next, the cooperating member 280 is slid on the inclined surface 264 of the taper punch 260 while being in contact with the outer edge 220 a of the circular blank 220. Subsequently, the upper mold 210
Is rotated with respect to the center axis of the inclined surface 264 so that the cooperating member 280 is moved together with the upper die 210 into the inclined surface 264.
And rotates around the outer edge 220 a of the circular blank 220 while making contact with the inclined surface 264.

The first punch 240 is brought into contact with the circular blank 220, and the upper die 210 presses the second punch 250 and the cooperating member 280 downward, while relatively pressing the second punch 250 and the blank holder 230. The circular blank 220 is narrowed down into the narrowing hole 232 of the blank holder 230 by being lowered together with the knockout 270. Thus, the circular blank 220 is squeezed while being pressed by the side end surface 220b in the direction toward the center axis of the inclined surface 264 of the taper punch 260, and is formed into a cylindrical container with a bottom.

Finally, the bottom 222 of the bottomed cylindrical container is pressed by the first punch 240 with the same pressing force as that at the time of molding, and the cooperating member 280 is pressed to the outer edge 220 of the circular blank 220.
The pressure on the upper die 210 and the blank holder 230 is increased except for the pressure on the knockout 270 while keeping the rotation on the a. As a result, the flange portion 22 of the bottomed cylindrical container
6 is pressed by the blank holder 230, the second punch 250, the taper punch 260, and the tip 282 of the cooperating member 280 to increase the thickness. Thus, a cylindrical container with a bottom having the flange 226 on the periphery of the opening and the outer edge 226a of the flange 226 being thickened can be completed.

In the above-mentioned conventional molding method, when forming a bottomed cylindrical container having a flange at the periphery of the opening and having an outer peripheral portion having a thickened wall, the squeezing and re-squeezing are performed with respect to the squeezing. In order to set the drawing ratio to 0.3 from the drawing limit value, for example, as shown in FIG. 10, five forming steps were required. In addition, in order to increase the rate of wall thickness increase to 0.6 or more, a drawing process for securing the body of the cylindrical container with a bottom and a swaging process are performed so as not to cause buckling. To do this, 2 to 5 thickening steps were required.

According to the molding method of this embodiment, the drawing ratio is set to 0.1.
In order to set the thickness to 3 and the thickness increase rate to 0.6 or more, each can be performed in one step as described above, and can be reduced to 1/3 or less as compared with the conventional molding method. Example 3 In this example, a cylindrical container with a bottom as shown in FIG. 12 was formed from a disk-shaped plate using the forming apparatus shown in FIG.

In the molding apparatus shown in FIG. 11, a disc-shaped plate material 320 is narrowed between an upper mold 310 movable in a vertical direction and a fixed lower mold 312, and a cylindrical narrowed hole 332 is formed. Shaped narrowing hole forming member (blank holder) 330
Narrowing means 34 for narrowing the plate 320 into the narrowing hole 332
0 (first punch 342 and third punch 344) and a pressing member (second punch) 350 which is integrally attached to the upper die 310 and presses the plate 320 against the peripheral surface 330a of the narrowing hole 332 of the blank holder 330. And an inclined surface forming member having an insertion hole 362 through which the lower portions of the blank holder 330 and the second punch 350 are inserted, and an approximately frustoconical inclined surface 364 formed on a surface adjacent to the insertion hole 362 ( And a taper punch 360.

The taper punch 360 in this molding apparatus
Are also the same members as those of the molding apparatus illustrated in FIG. The blank holder 330 is also substantially the same as that of the molding apparatus illustrated in FIG.
A cutout 330c is provided at the inner edge of 30a. The first punch 342 is formed of a columnar metal similarly to the first punch 140 described above, and is provided below the narrowing hole 332 of the blank holder 330 on the side of the bottom wall 322 of the bottomed cylindrical container.
It is a member that can be inserted at a cylindrical interval having the same shape as 24a. The first punch 342 is also a rod 3
Hydraulic control cylinder (not shown) connected via 43
Thereby, the inside of the narrowing hole 332 of the blank holder 330 can be freely moved up and down, and a pressing force of an arbitrary magnitude can be applied to the plate member 320 abutting on the front end thereof.

The third punch 344 is formed of a metal having a cylindrical shape.
This is a member that can be inserted into the upper part of the container with a cylindrical space having the same shape as the vertical wall part 324b on the opening side of the bottomed cylindrical container. The third punch 344 is also driven by a hydraulic control cylinder (not shown) connected via a rod 345.
By sliding with respect to the first punch 342 and the second punch 350, the upper part in the narrowing hole 332 of the blank holder 330 can be freely moved up and down. An arbitrary amount of pressing force can be applied. The third punch 344 engages with the protrusion 350a of the second punch 350 to restrict its movement so that the third punch 344 can slide only with a certain width with respect to the second punch 350. Stopper) 344a
Is formed.

On the other hand, the narrowing holes 33 of the blank holder 330
2 includes a knockout 370 that includes a cylindrical main body 372 and a protrusion 374 that protrudes in a cylindrical shape from the outer edge of the upper surface 372a of the main body 372, and that can slide in the narrowing hole 332. Was. This knockout 370
Can be freely moved up and down by a hydraulic control cylinder (not shown) connected via a rod 376, and a pressing force of an arbitrary magnitude can be applied to the plate material 320 contacted by the upper surface 372 a and the protrusion 374. Can act. Therefore, in the narrowed hole 332 of the blank holder 330, cylindrical spaces having different diameters are continuously formed at an equal space between the inner surface thereof and the first punch 342 and the third punch 344. You.

The second punch 350 is provided with a cooperating member 380, which is the same as the cooperating member 172 shown in FIG. 7, in a hole 352 provided on a surface portion facing the peripheral surface 330a of the blank holder 330. ing. That is, this cooperating member 380 has a tapered surface 382 a that is slidably contacted with the inclined surface 364, and has a cylindrical hole 352.
It has a sliding part 382 that can slide (having the same central axis as the central axis of the inclined surface), and a coil spring (not shown) that slides the sliding part 382 through the hole 352. The cooperating member 380 presses a part of the outer edge portion 320a of the plate member 320 from the side of the inclined surface of the tapered punch 360 on the diameter increasing side, so that the outer edge portion 3a moves toward the diameter increasing side.
20a can be suppressed from sliding.

The cooperating member 382 has a hole 352
Can be rotated about its central axis, and the plate 320
Around the entire outer periphery 320a of the. By controlling the hydraulic pressure of the hydraulic control cylinder of each member as shown in FIG. 13 and operating the molding apparatus shown in FIG. 11 as follows, a bottom plate shown in FIG. The cylindrical container can be formed in two steps. [First Step] First, the positions of the blank holder 330, the taper punch 360 and the knockout 370 are shown in FIG.
Set each in the position shown in. On the other hand, the disk-shaped plate material is made of a metal material, and the outer edge portion is formed as shown in FIG.
A circular blank 32 plastically deformed as shown in FIG.
Prepare 0. After the circular blank 320 is set on the peripheral surface 330b of the blank holder 330 so as to close the narrowing hole 332, the second punch 350 uses the second punch 350 so that the side end surface 320b slides vertically on the inclined surface 364. It presses against the peripheral surface 334 of the blank holder 330.

Next, the cooperating member 382 is brought into contact with the outer edge 320 a of the circular blank 320 while the taper punch 3
It is slid on the inclined surface 364 of 60 and is made to go around the entire outer periphery 320a. Then, the first punch 342
Then, after the third punch 344 is brought into contact with the center of the circular blank 320, the upper die 310 presses the second punch 350 downward, and the knockout 370 relative to the second punch 350 and the blank holder 330 is performed. , And the circular blank 320 is narrowed into the narrowing hole 332 of the blank holder 330. In this way, the circular blank 320 is squeezed while being pressed in the direction toward the central axis of the inclined surface 364 at the side end surface 320b, whereby the vertical wall portion and the flange portion of the bottomed cylindrical container are formed. [Second Step] The first punch 342 and the third punch 344 press the bottom 322 and the vertical wall 324 of the bottomed cylindrical container with the same pressing force as when they are formed, and the cooperating member 382 is moved to the outer edge 320a. With the upper part being rotated around the entire circumference, the pressing force of the upper die 310 and the blank holder 330 is increased except for the pressing force of the knockout 370. As a result, the outer edge portion 326a of the flange portion 326 of the bottomed cylindrical container receives the pressing, and the thickness increases. Thus, the bottomed cylindrical container shown in FIG. 12 can be completed. [Method of Forming a Cylindrical Container with a Bottom According to Claim 5] In the method of forming a cylindrical container with a bottom according to the present invention, the inclined surface forming member is slidably contacted with the inclined surface over the entire periphery of the side end surface of the plate. To move the side end surface along the inclined surface while moving the side end surface along the central axis of the inclined surface in the direction of the diameter increasing side and pressing the side end surface in the direction toward the central axis, As shown in FIG. 14, the peripheral portion located at the peripheral edge receives the stress σ _A and undergoes plastic deformation. At this time, the stress σ _{B is applied} to the side end face of the plate material.
Also acts to increase the thickness of the peripheral portion of the plate material. Thus, the cylindrical portion (vertical wall portion) of the bottomed cylindrical container is formed with its plate thickness increased. That is, the thickness of the bottomed cylindrical container can be increased while forming the vertical wall portion. As a result, it is possible to obtain a bottomed cylindrical container in which the thickness of the vertical wall portion is larger than that of the bottom portion.

In the present invention, the thickness of the vertical wall is increased to 1.5 times or more the bottom by controlling the pressing force with which the side end surface of the plate is pressed by the inclined surface toward the central axis. Can be. Also, as described in Japanese Patent Laid-Open No. Hei 6-21844,
The number of steps can be reduced and the configuration of the molding apparatus can be simplified as compared with the molding method disclosed in Japanese Patent Publication No.

Furthermore, since the plastic deformation of the peripheral portion of the plate material can be caused in the open space, the deformation of the peripheral portion is not suppressed by other members. That is, the degree of freedom of plastic deformation is large, and plastic deformation can be easily performed. Therefore, a large force is not required for the pressing force applied to the side end surface of the plate material by the inclined surface forming member. on the other hand,
Since the plastic material is plastically deformed while increasing the thickness of the peripheral portion, no break occurs at the boundary between the center portion and the peripheral portion when the thickness is small. Therefore, cracks and the like do not occur at the boundary. Therefore,
The control of the pressing force applied to the side end surface of the plate material by the inclined surface forming member becomes easy, and the cost for the control can be reduced. In particular, even if a circular blank is formed of a brittle material such as a steel material having a high carbon content, cracking can be prevented. In addition, we can take thickness of vertical wall part and flange part, bottom part each exactly,
Accurate control of the thickness of each part of the bottomed cylindrical container is facilitated.

In the present invention, it is also possible to cause the sheet material to be folded after the peripheral part of the sheet material has a sufficiently large thickness. At this time, since the thickness of the boundary portion is sufficiently increased, cracks are less likely to occur. On the other hand, applying pressure to the side end surface of the plate material by the inclined surface forming member, compared with the means for applying hydraulic pressure,
The configuration of the molding apparatus and the control of its operation are easy, for example, there is no need to seal the liquid as in the means for applying hydraulic pressure. Therefore, the use of the inclined surface forming member can apply the pressure to the side end surface of the plate at a low cost, such as a reduction in the mold cost, rather than the means for applying the hydraulic pressure.

For the above reasons, according to the method for forming a cylindrical container with a bottom of the present invention, the thickness of each part of the cylindrical container with a bottom can be easily and inexpensively controlled. therefore,
It is possible to easily and inexpensively mold a cylindrical container with a bottom having a different plate thickness at each portion. A preferred embodiment of the method for forming a bottomed cylindrical container of the present invention will be described below. The material of the substantially disk-shaped plate is not particularly limited, and a plate made of a metal material or the like can be used. Further, the plate material does not need to have an accurate disk shape, and may have an elliptical shape or the like. The material and plate thickness thereof can be appropriately selected according to the desired performance of the bottomed cylindrical container.

The method of fixing the substantially central portion of the plate material is not particularly limited, but a member large enough to be inserted into the bottomed cylindrical container and a member large enough to be inserted into the inclined surface forming member. It is preferable that the member is sandwiched and fixed between two members. The shape and material of the inclined surface forming member are not particularly limited, and examples thereof include those having the shapes shown in FIGS. 1 to 3. In addition, as shown in FIGS. 2 and 3, when the inclined surface has a curvature with respect to the direction of the diameter increasing side, the curvature is not particularly limited, but the plate material can be slid. It is preferable to select appropriately. Regarding the material of the slope forming member,
It is preferable to select a material that is excellent in slipperiness and that can withstand contact stress with the plate material so that at least the surface of the inclined surface can easily slide the plate material.

According to the present invention, the inclined surface forming member may be moved by pulling from the side of the inclined surface on the diameter increasing side,
You may move by pressing from the direction of the diameter reduction side of an inclined surface.
Alternatively, an engaging portion that can engage with the belt may be provided on the side surface, and the inclined surface forming member may be moved by the belt.
Further, it is preferable that the inclined surface forming member is provided with a sliding portion having a sliding surface which is continuous with the inclined surface and which can slide on a completely deformed peripheral portion (vertical wall portion) of the plate material. . With this sliding portion, a cylindrical container with a bottom can be stably obtained without damaging the vertical wall portion.

The method for molding a cylindrical container with a bottom according to the present invention can be carried out using the following molding apparatus. The forming device is a forming device for forming a bottomed cylindrical container from a substantially disk-shaped plate material, wherein a holding member for holding and fixing a substantially central portion of the plate material is inserted through the bottomed cylindrical container in a depth direction. And an inclined surface forming member which has a substantially truncated conical side surface formed on a surface adjacent to the inserted hole, and which can reciprocate along a central axis of the inclined surface. After fixing the central portion by the holding member, the inclined surface forming member slides the side end surface of the plate material over the entire periphery of the inclined surface along the inclined surface along the central axis of the inclined surface to increase the diameter of the inclined surface. In the direction of the central axis by sliding the side end surface in the direction of the diameter reduction side of the inclined surface while pressing the side end surface in the direction toward the central axis. Plastically deform to form the cylindrical portion of the bottomed cylindrical container, and form the bottomed cylindrical container. It is characterized in. Embodiment 4 As such a molding apparatus, for example, a molding apparatus shown in FIG. 15 can be mentioned. In this FIG.
A state is shown in which the inclined surface forming member is moved in the direction of the diameter increasing side of the inclined surface while the side end surface of the plate material is slid on the inclined surface over the entire circumference.

In the molding apparatus illustrated in FIG. 15, a vertically movable upper die 410 and a fixed lower die 412 are disposed between the upper die 410 and the fixed lower die 412.
It has a holding member (punch 430 and knockout 440) for holding and fixing the central portion of the plate 420, and an insertion hole 452 through which the bottomed cylindrical container can be inserted in the depth direction. An inclined surface 454 having a truncated cone side surface is formed, and an inclined surface forming member (taper punch) 450 that can reciprocate along the central axis of the inclined surface 454 is provided.

The punch 430 is fixed to the upper die 410,
It can move up and down together with the upper mold 410. Knockout 440 is a columnar metal member, and its tip is in contact with the center of plate 420. This knockout 4
The plate 40 can be freely moved up and down by a hydraulic control cylinder (not shown) connected via a cushion 442, and a push of an arbitrary size is placed on the center of the plate 420 abutting on its tip. Pressure can be applied.

This forming apparatus operates as follows to form a bottomed cylindrical container from a disk-shaped plate.
First, the position of the knockout 440 is set to the position shown in FIG. On the other hand, as a disk-shaped plate material. 1 is made of a metal material, and the outer edge portion 420a is shown in FIG.
Circular blank 4 plastically deformed as shown in FIG.
Prepare 20. The circular blank 420 is set on the knockout 440, and its side end surface 420 b is brought into sliding contact with the inclined surface 454 of the tapered punch 450. The punch is brought into contact with the circular blank 420 and the punch and knockout are lowered. Therefore, the taper punch 450 moves relatively upward with respect to the blank holder 440. As a result, the circular blank 420 is
The side end surface 420b is pressed by the 50 toward the center axis of the inclined surface 454 while the side end surface 420b is
4 and slides downward at its peripheral portion 420b.
Is plastically deformed in the direction of the diameter reduction side of the inclined surface 454. In addition,
By appropriately controlling the lowering speed of the knockout 440 and the taper punch 450, the boundary between the center of the circular blank 420 and the peripheral edge thereof can be bent. Thus, as shown in FIG. 15B, the cylindrical portion 424 of the cylindrical container with a bottom can be formed with a greater plate thickness than the bottom 422. (Modification) In the present invention, the peripheral portion is deformed in the radially reduced side of the inclined surface so that the angle between the inclined surface and the central axis is smaller than the angle between the central portion and the peripheral edge. Then, it is preferable that the side end surface is slid on the inclined surface. With this, a large amount of stress can be applied to the side end surface of the plate material to slide in the direction of the reduced diameter side of the inclined surface, and the side end surface is pressed while pressing the side end surface in the direction toward the center axis of the inclined surface. It can be easily slid on the inclined surface.

Further, while vibrating the peripheral portion in small increments,
It is preferable that the side end surface of the plate material is pressed in a direction toward the central axis of the inclined surface on the inclined surface of the inclined surface forming member. Thereby, the thickness of the peripheral portion can be more efficiently increased. That is, the thickness of the peripheral portion can be increased without increasing the force of pressing the side end surface of the plate material with the inclined surface of the inclined surface forming member. In the above-described forming apparatus, if the plate material holding device is vibrated little by little, the vibration is transmitted to the peripheral portion via the bottom of the plate material.

By the way, in the molding apparatus shown in FIG. 15, the inclined surface 4 of the sliding portion 450b of the inclined surface forming member 450
It is preferable to provide a protruding portion 450c that protrudes in the center axis direction of the inclined surface on the inner peripheral surface portion adjacent to 54 as shown in FIG. As described above, the peripheral portion 420 of the plate 420
a is plastically deformed to form a cylindrical portion (vertical wall portion) 424. Then, by pressing the protruding portion 450c and the holding members (punch 430 and knockout 440) together, as shown in FIG. The thickness of the boundary portion (R portion) 426 between the vertical wall portion 422 and the vertical wall portion 424 can be increased.

Further, as shown in FIG.
Boundary part 420c between center part 20 and peripheral part 420a
By increasing the thickness in advance,
As shown in (b), the thickness of the boundary portion (R portion) 426 ′ between the bottom portion 422 of the bottomed cylindrical container and the vertical wall portion 424 is set to the bottom portion 422.
And it can also be made larger than the vertical wall part 424.

[Brief description of the drawings]

FIG. 1 is a view showing an inclined surface forming member that can be used in the present invention. (A) is a perspective view thereof.
(B) is a longitudinal sectional view.

FIG. 2 is a view showing an inclined surface forming member that can be used in the present invention. (A) is a perspective view thereof.
(B) is a longitudinal sectional view.

FIG. 3 is a view showing an inclined surface forming member that can be used in the present invention. (A) is a perspective view thereof.
(B) is a longitudinal sectional view.

FIG. 4 is a cross-sectional view showing a molding apparatus used in Example 1 and showing an operation method thereof. (A) is a figure which shows the mode of the shaping | molding apparatus before narrowing down a board | plate material.
(B) is a figure which shows a mode of the shaping | molding apparatus after squeezing a board material.

FIG. 5 is a cross-sectional view showing a molding apparatus used in a modification of the first embodiment and showing an operation method thereof.
(A) is a figure which shows the mode of the shaping | molding apparatus before narrowing down a board | plate material. (B) is a figure which shows a mode of the shaping | molding apparatus after squeezing a board material.

FIG. 6 is a cross-sectional view showing a molding apparatus used in a modification of the first embodiment and showing an operation method thereof.
(A) is a figure which shows the mode of the shaping | molding apparatus before narrowing down a board | plate material. (B) is a figure which shows a mode of the shaping | molding apparatus after squeezing a board material.

FIG. 7 is a cross-sectional view showing a molding apparatus used in a modification of the first embodiment and showing an operation method thereof.
(A) is a figure which shows the mode of the shaping | molding apparatus before narrowing down a board | plate material. (B) is a figure which shows a mode of the shaping | molding apparatus after squeezing a board material.

FIG. 8 is a cross-sectional view showing a molding apparatus used in a modification of the first embodiment and showing an operation method thereof.
(A) is a figure which shows the mode of the shaping | molding apparatus before narrowing down a board | plate material. (B) is a figure which shows a mode of the shaping | molding apparatus after squeezing a board material.

FIG. 9 is a sectional view showing a molding apparatus used in Example 2 and showing an operation method thereof. (A) is a figure which shows the mode of the shaping | molding apparatus before narrowing down a board | plate material.
(B) is a figure which shows a mode of the shaping | molding apparatus after squeezing a board material.

FIG. 10 is a graph comparing the drawing ratio of a sheet material and the wall thickness increase of an outer edge portion of a flange portion between the molding method of Example 2 and a conventional molding method.

FIG. 11 is a sectional view showing a molding apparatus used in Example 3 and showing an operation method thereof. (A)
It is a figure which shows the mode of the shaping | molding apparatus before narrowing down a board | plate material.
(B) is a figure which shows a mode of the shaping | molding apparatus after squeezing a board material.

FIG. 12 is a cross-sectional view showing a plate material before molding and a bottomed cylindrical container after molding in the molding method of Example 3.

FIG. 13 is a graph showing a change in hydraulic pressure of a hydraulic control cylinder that controls the vertical movement of each member when the bottomed cylindrical container of Embodiment 3 is formed.

FIG. 14 is a cross-sectional view schematically showing stress applied to a side end surface of a plate material from an inclined surface of an inclined surface forming member according to another embodiment of the present invention.

FIG. 15 is a sectional view showing a molding apparatus used in Example 4 and showing an operation method thereof. (A)
It is a figure which shows the mode of the shaping | molding apparatus before deforming a board | plate material.
(B) is a figure which shows a mode of the shaping | molding apparatus after deforming a board | plate material.

FIG. 16 is a cross-sectional view showing a molding apparatus used in a modification of the fourth embodiment and showing an operation method thereof.
(A) is a figure which shows a mode of the shaping | molding apparatus before deforming a board | plate material. (B) is a figure which shows the mode of the shaping | molding apparatus after deforming a board | plate material.

FIG. 17 is a cross-sectional view showing a molding apparatus used in a modification of the fourth embodiment and showing an operation method thereof.
(A) is a figure which shows a mode of the shaping | molding apparatus before deforming a board | plate material. (B) is a figure which shows the mode of the shaping | molding apparatus after deforming a board | plate material.

FIG. 18 is a cross-sectional view of a main part showing a conventional method for forming a bottomed cylindrical container.

FIG. 19 is a cross-sectional view illustrating a state in which a boundary is formed between a bottom and a vertical wall in a conventional method of forming a bottomed cylindrical container.

[Explanation of symbols]

110: Upper die 112: Lower die 120: Plate material 120a: Outer edge 120b: Side end surface 130: Restriction hole forming member 132: Restriction hole 130b:
Peripheral surface 140: narrowing means 150: inclined surface forming member 152: insertion hole 154: inclined surface 150a: inclined surface portion 150b: sliding portion

Claims (6)

[Claims] 1. A narrow hole forming member having a substantially cylindrical narrow hole through which a substantially disk-shaped plate material is narrowed, and narrowing means for narrowing the plate material into the narrow hole. A bottomed cylindrical container, which is installed on the peripheral surface of the narrowed hole so as to close the narrowed hole, and the plate material is narrowed into the narrowed hole by the narrowing means to form a cylindrical container with a bottom. In the molding method, an inclined surface forming member having an insertion hole through which the narrowed hole forming member can be inserted, and a substantially frustoconical side surface-shaped inclined surface formed on an adjacent surface of the insertion hole, By sliding the side end surface of the plate material on the inclined surface over the entire circumference, the central axes of the inclined surface and the narrowing hole are substantially matched, and the inclined surface and the narrowed hole are moved in the direction of the diameter increasing side of the inclined surface, so that A method of forming a bottomed cylindrical container, wherein the narrowing is performed while pressing an end face in a direction toward a center axis of the inclined surface. 2. The method for forming a cylindrical container with a bottom according to claim 1, wherein the side surface is vertically slid on the inclined surface to move the inclined surface forming member. 3. At least a part of an outer edge portion of the plate material,
The molding of the bottomed cylindrical container according to any one of claims 1 and 2, wherein the outer edge portion is prevented from sliding in the moving direction by a pressing unit that presses the inclined surface from the side of the diameter increasing side. Law. 4. The pressing means is in contact with at least a part of an outer edge portion of the plate member and an inclined surface of the narrowing hole forming member, and the inclination means is moved with movement of the inclined surface forming member. The method for forming a cylindrical container with a bottom according to claim 3, wherein the cooperating member moves along a surface. 5. A molding method for molding a bottomed cylindrical container from a substantially disk-shaped plate material, wherein after fixing the bottom of the bottomed cylindrical container to the plate material, the bottomed cylindrical container can be inserted in a depth direction. An inclined surface forming member having an insertion hole, and having a substantially frustoconical side surface inclined surface formed on a surface adjacent to the insertion hole, while sliding the side end surface of the plate material on the inclined surface over the entire circumference. The inclined surface is moved along the central axis of the inclined surface in the direction of the diameter increasing side of the inclined surface, and the side end surface is reduced in diameter on the inclined surface while pressing the side end surface in the direction toward the central axis. A method for forming a cylindrical container with a bottom, characterized in that the cylindrical container with a bottom is molded by sliding in the side direction to plastically deform the peripheral portion of the central portion. 6. The peripheral portion is deformed in the direction of the diameter reduction side of the inclined surface so that an angle between the inclined surface and the central axis is smaller than an angle between the central portion and the peripheral edge. 6. After that, the side end surface is brought into sliding contact with the inclined surface.
3. The method for forming a cylindrical container with a bottom according to item 1.