JPH11319990A - Press die for combined working - Google Patents

Abstract

PROBLEM TO BE SOLVED: To conduct three processes of piercing, burring, curling by one process of press. SOLUTION: The press die is constituted so that a moving die 16 arranged on a lower die 11 is supported on an actuator 21, a sectional die 20 expanding/ reducing in a collet way is arranged in a pad 17 of an upper die 12, at beginning, a prepared hole is pierced to a work Wc by descending a punch 18 in cooperation with the moving die 16. Successively, by actuation of a pumping cylinder 23 linked to a fixed cam 26 vertically arranged on a press ram, a pressure oil is supplied to the actuator 21 to ascend the moving die 16 and curling is conducted. Further, by utilizing the descending of the punch 18, its taper shoulder part 18b is acted on a cylindrical part by curling to conduct burring, corresponding to the ascending of the upper die 12, a tip part of a moving piece 30 of the sectional die 20 is protruded from the pad 17, the sectional die 20 is detached from the work Wc.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a composite processing press die for continuously performing three processes of punching, burring and curling in one step of pressing.

[0002]

2. Description of the Related Art For example, as shown in FIG. 16, a car part has a tubular portion 2 around a hole 1 having a predetermined diameter D, and the car part expands at an angle θ with respect to the tubular portion 2. There is a panel 4 formed by connecting the enlarged portion 3 to the panel. Such a panel 4
Generally, as shown in FIG. 17, a step of forming a pilot hole Wa in a workpiece W as a panel material by punching, a step of burring an edge of the pilot hole Wa to create a cylindrical portion Wb, The step of curling the distal end side of the shaped portion Wb to create a flared enlarged portion Wc is sequentially performed.

[0003] Incidentally, since the above-mentioned hole punching () and burring () have the same processing direction, they can be continuously performed by utilizing the movement in one direction (pressing direction) of the punch. . However, in the curling process (), since the processing direction is opposite to the burring process, the conventional general-purpose press die cannot perform the curling process subsequent to the burring process. Combination of punching and burring and curling are performed in separate steps (see, for example, JP-A-8-132146).

[0004]

That is, conventionally, when performing three processes of punching, burring and curling, at least two processes are required, and the cost burden is increased due to the double investment of the press machine and the press die. There is a problem that not only is it unavoidable, but also that a decrease in productivity due to an increase in man-hours is unavoidable.

[0005] The present invention has been made in view of the above-mentioned conventional problems, and an object thereof is to perform three processes of punching, burring, and curling continuously in one process of pressing. It is an object of the present invention to provide a press die which makes it possible to greatly reduce equipment costs and improve productivity.

[0006]

According to a first aspect of the present invention, there is provided a lower die having a die, a pad for pressing the work on the lower die, and a lower hole in the work in cooperation with the die. An upper die provided with a punch for opening the punch, wherein the die is supported by an actuator, and a collet for enlarging and reducing the diameter of the collet around the punch is arranged in the pad. A first receiving surface for burring the edge of the pilot hole in cooperation with a second receiving surface for curling a cylindrical portion formed by the burring in cooperation with the punch; The punch is configured to expand and contract in diameter in accordance with the separation and seating of the punch with respect to the lower die.

In the first invention, after punching is performed by lowering the punch, burring is performed by raising the die with an actuator against the approaching die, and subsequently utilizing the lowering of the punch. Curling can be performed, and three processes of punching, burring, and curling are completed in the process of descending from the upper dead center to the lower dead center of the upper die. Moreover, after the processing is completed, the diameter of the approaching mold increases as the pad moves away from the lower mold, and the workpiece can be released.

According to a second aspect of the present invention, there is provided a lower die having a die, a pad for pressing the work on the lower die, and a punch for forming a pilot hole in the work in cooperation with the die. An upper die provided, wherein the die is supported by a cushion, and a collet type enlarging and contracting in a collet type around the die and a guide cylinder surrounding the collet type are arranged in the lower die, The mold has a first receiving surface for burring the edge of the pilot hole in cooperation with the punch, and a second receiving surface for curling a cylindrical portion formed by the burring in cooperation with the die. 2 is provided, and the diameter of the shift die is enlarged and reduced by relative movement between the shift die and the guide cylinder.

In the second aspect of the present invention, after punching is performed by lowering the punch, the punch and the die are integrally lowered as they are against the approaching die, and burring is performed. The die can be raised by cushion pressure according to the rise of the punch, and the curling process can be performed, and the combined processing of punching and burring in the lowering process from the top dead center to the bottom dead center of the upper die, The curling process is completed in the ascending process from the bottom dead center to the top dead center of the upper die. In addition, after the processing is completed, the workpiece can be released from the mold by relatively moving the guide die and the guide cylinder to increase the diameter of the guide die.

[0010]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 to FIG. 6 show a first embodiment of the present invention. In these figures, 11 is
The lower mold 12 is attached to a press bolster (not shown). The upper mold 12 is attached to a press ram (not shown).
Is moved up and down integrally with the press ram so as to approach and separate from the lower mold 11. In the present embodiment, as shown in FIG. 16 described above, a panel 4 formed by connecting a tubular portion 2 and a flared enlarged portion 3 around a hole 1 is formed. The mold 11 is generally constituted by a die holder 13 fixed on the bolster, a fixed die 14 fixed on the die holder 13, and a movable die 16 disposed in a concave hole 15 of the fixed die 14. I have. On the other hand, the upper die 12 includes a punch holder (not shown) fixed to the press ram, a pad 17 supported by the punch holder so as to be able to float and pressing the work W on the fixed die 14.
A punch 18 fixed to the punch holder and forming a preliminary hole Wa in the work W in cooperation with the movable die 16;
Are arranged around the punch 17 in a concave hole 19, and are roughly constituted by a collet type 20 that expands and contracts in a collet type.

Concave hole 1 of fixed die 14 constituting lower mold 11
As shown in the enlarged view of FIG. 2, a portion of the fixed die 14 that passes through the upper surface of the fixed die 14 is a small-diameter hole 15 a, and a portion extending from the small-diameter hole 15 a to the inside is a tapered hole 15 b. . On the other hand, the movable die 16 disposed in the concave hole 15 has a small-diameter portion 16a that can be inserted into the small-diameter hole 15a and a tapered shoulder 16b that can abut the tapered hole 15b. It is provided continuously. The outer diameter of the small diameter portion 16a of the movable die 16 is the diameter D of the hole 1 of the panel 4.
(FIG. 15), the small diameter portion 16a
Is used as a molding part for burring described later.

An actuator 2 for supporting a movable die 16 and moving the movable die 16 up and down in a concave hole 15 of the fixed die 14 is provided.
1 is provided. The actuator 21 includes a cylinder body 21a that is arranged upright and a cylinder body 21a.
The movable die 1 includes a piston 21b slidably housed in the inner side of the movable die 1a, and a piston 21b defining an oil chamber on a lower side thereof, and a rod 21c extending upward from the piston 21b.
Numeral 6 is supported by a tip of a rod 21c of the actuator 21 via a support base 22. Actuator 2
In the first oil chamber, a pumping cylinder 23 disposed outside the mold is provided.
The supply and discharge of the oil liquid from the pumping cylinder 23 causes the rod 21c of the actuator 21 to extend or shorten, and the movable die 16 rises accordingly. Or come down. At this time, the position at which the tapered shoulder portion 16b of the movable die 16 contacts the tapered hole portion 15b of the concave hole 15 is the rising end. In this state, the upper end portion of the movable die 16 projects from the fixed die 14 by a predetermined distance. (FIG. 4). The movable die 16 is also provided with the support base 22 having the concave hole 15.
The position at which it is seated on the ring stopper 25 disposed therein is the lower end. In this state, the upper surface of the movable die 16 is positioned so as to be flush with the upper surface of the fixed die 14 (FIGS. 1 and 2).

The pumping cylinder 23 has a cylinder body 23a disposed horizontally, and an oil chamber connected to the oil chamber of the actuator 21 by a pipe 24 is formed in one end of the cylinder body 23a. Piston 2 to be formed
3b is slidably housed. A rod 23c extends in a horizontal direction from the piston 23b, and a cam follower 27 that can be engaged with a fixed cam 26 that is suspended from a press ram (not shown) is attached to a tip of the rod 23c. The rod 23c is normally urged toward the extension side by a spring 28 interposed between the cylinder body 23a and the cam follower 27, and the cam follower 27 is positioned within the movement range of the fixed cam 26 at the extension end. . On the side surface of the fixed cam 26, a cam portion 26a that forms an angle in the pressing direction P is formed.
Is lifted on the cam portion 26a in accordance with the movement of the fixed cam 26, whereby the rod 23c is driven to the shortening side. Then, in response to the shortening of the rod 23c, the oil liquid in the oil chamber of the cylinder body 23a is pressure-fed to the oil chamber side of the actuator 21 through the pipe 24,
Of the rod 21c is extended.

On the other hand, the punch 18 constituting the upper mold 12 is
An inverted frustoconical tapered shoulder portion 18b is provided on the base end side of a punching punch portion 18a for forming a prepared hole Wa in the work W in cooperation with the movable die 16. The tapered shoulder portion 18b is used as a molding portion for curling processing, which will be described in detail later. The inclination angle of the tapered shoulder portion 18b with respect to the axis is set to be the same as the inclination angle θ (FIG. 16) of the enlarged portion 3 of the panel 4. ing.

A plurality of (four in this case) movable molds 20 arranged in the recessed holes 19 of the pad 17 are arranged in the circumferential direction of the punch 18 and form a cylindrical surface on the inside in a state where they are aligned with each other. The piece 30 and the concave hole 19 fitted in the punch 18
A ring-shaped support 31 slidably housed in the support 31 has one end fixed to the support 31 and each movable piece 30
Are connected to each other, and each movable piece 30
Is always outside the radius of the punch 18 by the leaf spring 32,
In other words, they are urged in the direction of opening each other, and maintain the expanded state. A tapered surface 33 is formed on the back side of each movable piece 30, while
At the opening end side of 9, a frusto-conical tapered hole portion 34 is formed which is aligned with the tapered surface 33. Also, pad 1
In the bottom portion of the concave hole 19, the shift mold 20 is always provided with the concave hole 1.
A spring (here, a coil spring) 35 that urges in the direction of withdrawal from the housing 9 is housed.

Thus, when the upper die 12 is raised, that is, when the pad 17 is separated (seated) from the fixed die 14 of the lower die 11, the tip of the movable piece 30 is pushed by the spring 35 and Each movable piece 30 protrudes from the concave hole 19 and moves in the opening direction by the urging force of the leaf spring 32, so that the approaching die 20 maintains the expanded diameter state (FIG. 6). On the other hand, when the upper die 12 descends from this state and the pad 17 approaches the fixed die 14 of the lower die 11, first, the movable piece 30
Then, the lowering is stopped, and the tapered surface 33 on the back side of each movable piece 30 gradually fits into the tapered hole 34 of the pad 17 that descends, and each movable piece 30 causes the leaf spring 32 to bend. While moving in the closing direction. At the stage where the pad 17 abuts (sits) on the fixed die 14, each movable piece 3
0 are aligned with each other, and the closing mold 20 is completely reduced in diameter (FIG. 1). In addition, in the concave hole 19 of the pad 17,
A stopper (not shown) is provided for restricting slippage of the shift mold 20 from the concave hole 19 by a predetermined amount or more.

Thus, each movable piece 30 of the shifting die 20
A cylindrical first receiving surface 30a for burring the edge of the pilot hole Wa in cooperation with the burring small diameter portion 16a of the movable die 16 is formed on the inner diameter side of the tip of the movable die 16 by the burring processing. A tapered second receiving surface 30b for curling the formed cylindrical portion Wb in cooperation with the curling tapered shoulder portion 18b of the punch 18 is provided.

Hereinafter, the operation of the press die configured as described above will be described. At the time of processing, the work W is placed on the fixed die 14 of the lower die 11 with the upper die 12 raised,
After the setting of the work W is completed, the upper die 12 is lowered substantially integrally with the press ram as illustrated. At this time, the upper mold 12 descends with the shift mold 20 leading first, followed by the pad 17 and the punch 18 in that order. First, the movable piece 30 of the shift die 20 presses the work W against the fixed die 14 to stop the lowering thereof, and then the movable piece 30
Is moved in the closing direction, and as shown in FIG. 1, at the stage where the pad 17 is seated on the fixed die 14 via the work W, the approach die 20 is in a reduced diameter state. Then, punch 18
Continues to descend integrally with the press ram, and the punching punch portion 18a on the tip side cooperates with the movable die 16 to form a pilot hole Wa in the work W.

Simultaneously with the completion of the above-described punching, the cam portion 26a of the fixed cam 26 which is suspended from the press ram engages with the cam follower 27 provided at the rod end of the pumping cylinder 23, and as shown in FIG. Is mounted on the cam portion 26a of the fixed cam 26. As a result, the rod 23c of the pumping cylinder 23 is shortened, the oil liquid in the oil chamber is pressure-fed to the oil chamber side of the actuator 21, the rod 21c of the actuator 21 is extended, and the movable die 16 moves upward. As a result, the small diameter portion 16a of the movable die 16 presses the edge around the prepared hole Wa of the work W upward, and the edge contacts the cylindrical first receiving surface 30a of the movable piece 30 of the shift die 20. And rises along the workpiece W to form a cylindrical part Wb.
Is created, and the burring process is completed.

Simultaneously with the completion of the burring, the cam follower 27 at the rod end of the pumping cylinder 23 is moved to the cam portion 2 of the fixed cam 26 as shown in FIG.
6a, whereby the rod 23c of the pumping cylinder 23 extends, the oil chamber thereof expands, and the oil liquid of the actuator 21 flows through the pipe 24 to the pumping cylinder 2c.
Returned to 3. As a result, the movable die 16 moves downward following the downward movement of the punch 18, and the tapered shoulder portion 18b of the punch 18
Gradually expands the distal end of the cylindrical portion Wb of the work W, and the tapered second receiving surface 3 of the movable piece 30 of the approaching die 20.
0b, whereby an enlarged portion Wc is created at the tip of the cylindrical portion Wb of the work W, the curling process is completed, and the punch 18, that is, the upper die 12 reaches the bottom dead center.

Thereafter, the press ram starts to move upward, the punch 18 first rises, and then the pad 17 rises. At this time, the fixed cam 26 ascends integrally with the punch 18 so that the cam follower 27 at the rod end of the pumping cylinder 23 climbs over the cam portion 26a. During this time, the movable die 16 once rises to the burring position. Return to the initial position. And, by the rise of the pad 17,
As shown in FIG. 6, the tip of the movable piece 30 is pushed out of the concave hole 19 of the pad 17 by being pushed by the spring 35, and each movable piece 30 moves in the opening direction by the urging force of the leaf spring 32. 1
The receiving surface 30a and the second receiving surface 30b come off the work W. The approaching die 20 rises together with the pad 17 while maintaining this expanded state, and the upper die 12 reaches the top dead center, completing one step of pressing. That is, in the process of lowering the upper die 12 from the top dead center to the bottom dead center, three processes of punching, burring, and curling are completed, and the panel 4 is completed in one step of pressing. In this embodiment, a cylinder mechanism using hydraulic pressure is used for the actuator 21. However, as a mechanism for mechanically linking with the upper mold, a link mechanism and a cam mechanism perform the same function. Can be used as

FIGS. 7 to 11 show a second embodiment of the present invention. The feature of the second embodiment is that a collet type 20 that expands and contracts in a collet type is
In the first embodiment, the inside of the concave hole 19 of the pad 17 is moved in the opposite direction to the inside of the concave hole 15 of the fixed die 14, and the movable mold 20 is supported by the actuator 40 and a guide is provided around the movable mold 20. The point is that the cylinder 41 is arranged, and the movable die 16 is supported by the cushion 42. Since the components of the second embodiment are basically the same as those of the first embodiment, the same components are denoted by the same reference numerals.

More specifically, the recess 15 of the fixing die 14
Is formed as a straight hole having a diameter sufficiently larger than the diameter of the movable die 16, and the actuator 40, the guide cylinder 41, the cushion 42 and the like are collectively placed on a support table 43 provided at the bottom of the concave hole 15. It is arranged. The actuator 40 includes a plurality of cylinder bodies 40a arranged upright, and a piston 40b defining an air chamber below the cylinder bodies 40a in each cylinder body 40a, and a spring 40c for normally urging the piston 40b downward. And housed. Rods 40d extend upward from the piston 40b, and the support 31 of the closing die 20 is connected to the tip of each rod 40d. The cylinder body 40a can be replaced with a donut-shaped cylinder. Compressed air is supplied to and discharged from the air chamber of the actuator 40 from an air pressure means 44 disposed outside the mold. In response to the supply of the compressed air, the piston 40b responds to the urging force of the spring 40c. In response, the rod 40d extends, and the closing mold 20 rises (FIG. 11). On the other hand, in the state where this approaching mold 20 is raised,
When the compressed air is discharged from the air chamber of the actuator 40, the piston 40a is moved downward by the urging force of the spring 40c, the rod 40d is shortened, and the closing die 20 is lowered.

Here, on the upper side of the guide cylinder 41, a frusto-conical tapered hole 41a is formed which matches the tapered surface 33 on the back side of each movable piece 30 of the shift die 20. Thereby, when the approaching die 20 is raised by the actuator 40, the distal end of the movable piece 30 is
, Each movable piece 30 moves in the opening direction by the urging force of the leaf spring 32, and the approach mold 20 maintains the expanded state (FIG. 11). On the other hand, in a state where the shift mold 20 is lowered by the actuator 40, the movable piece 30
The respective movable pieces 30 move in the closing direction, and the approaching die 20 maintains the reduced diameter state (FIG. 7).

The cushion 42 for supporting the movable die 16 is a rod that accommodates a spring 42b on the bottom side and a piston 42c on the upper side of a cylinder body 42a arranged upright, and extends upward from the piston 42c. 4
A support base 22 that supports the movable die 16 is connected to the tip of 2d. The piston 42c is normally positioned at the rising end in contact with the upper wall of the cylinder body 42a by the spring 42b. At this time, the upper surface of the movable die 16 is positioned exactly flush with the upper surface of the fixed die 14. ing.

In the second embodiment, as shown in FIG. 7, the compressed air in the air chamber in the actuator 40 is discharged in advance, and the biasing force of the spring 40c lowers the approaching die 20 to reduce the diameter. After placing the workpiece W on the lower die 11 in this state, the upper die 1 is integrated with a press ram (not shown).
Lower 2 Then, the pad 17 descending earlier
As a result, the work W is pressed onto the fixed die 14 and the closing die 20, and then the punching punch portion 18 a of the punch 18 that descends cooperates with the movable die 16 to form a pilot hole Wa in the work W.

After the above-described punching is completed, the punch 18 continues to descend, so that the tapered shoulder 18b of the punch 18 moves the edge around the prepared hole Wa of the work W downward as shown in FIG. Press, the edge rises along the cylindrical first receiving surface 30a of the movable piece 30 of the shift mold 20,
The cylindrical portion Wb is created in the work W, and the burring is completed. At this time, the movable die 16 is pushed down by the punch 18 and descends while compressing the spring 42b of the cushion 42.

At the same time as the completion of the burring process, the upper die 12 reaches the bottom dead center.
Starts to rise. As a result, as shown in FIG. 10, the movable die 16 rises by receiving the urging force of the spring 42b of the cushion 42, and the tapered shoulder 16b of the movable die 16 gradually moves the tip of the cylindrical portion Wb of the work W. The workpiece W is spread and pressed against the tapered second receiving surface 30b of the movable piece 30 of the approaching die 20, whereby an enlarged portion Wc is created at the tip of the cylindrical portion Wb of the work W, and the curling process is completed. I do.

Thereafter, as shown in FIG.
Rises, and compressed air is supplied from the air pressure means 44 to the air chamber of the actuator 40. Then, the piston 40b of the actuator 40 moves upward, and the
0 rises, and the leading end of the movable piece 30 of the shift mold 20 projects from the guide cylinder 41. As a result, each movable piece 30 moves in the opening direction by the urging force of the leaf spring 32, the diameter of the approaching die 20 increases, and the first receiving surface 30 a and the second receiving surface 3 of each movable piece 30.
0b comes out of the workpiece W, and the upper die 12 continues to rise and reaches the top dead center. That is, drilling and burring are completed in the descending process from the top dead center to the bottom dead center of the upper mold 12, and curling is completed in the ascending process from the bottom dead center to the top dead center of the upper mold 12, respectively. The panel 4 is completed within one step of pressing.

FIGS. 12 to 15 show a third embodiment of the present invention. A feature of the third embodiment is that a collapsible mold 20 that expands and contracts in a collet type.
And the actuator 40 as in the second embodiment.
Without being supported by the support die, the support die 43 is fixedly disposed in the recessed hole 15 of the fixed die 14, and the support table 43 on which the guide cylinder 41, the movable die 16, and the cushion 42 around the approach die 20 are arranged can be moved up and down. The point is that this is supported by the actuator 50 fixed to the lower mold 11. Since each component of the third embodiment is basically the same as that of the second embodiment, the same components are denoted by the same reference numerals.

The actuator 50 has a cylinder body 50a arranged upright, a piston 50b slidably housed in the cylinder body 50a and defining an oil chamber below the cylinder body 50a, and an upward direction from the piston 50b. The support base 43 is supported by the tip of the rod 50c of the actuator 50. The oil chamber of the actuator 50 is configured to supply and discharge an oil liquid from a pumping cylinder 51 disposed outside the mold through a pipe 52.
1, the rod 50c of the actuator 50 is extended or shortened.
Will rise or fall.

The pumping cylinder 51 has a cylinder body 51a disposed horizontally, and an oil chamber connected to the oil chamber of the actuator 50 by a pipe 52 is formed in one end of the cylinder body 51a. Piston 5 to be formed
1b is slidably housed. A rod 51c extends in the horizontal direction from the piston 51b, and a cam follower 54 that can be engaged with a fixed cam 53 that is vertically provided on a press ram (not shown) is attached to the tip of the rod 51c. The rod 51c is normally urged toward the extension side by a spring 55 interposed between the cylinder body 51a and the cam follower 54, and the cam follower 54 is positioned within the movement range of the fixed cam 53 at the extension end. . At the lower end of the fixed cam 53, a cam surface 53a inclined in the pressing direction P is formed.
Is lifted from the cam surface 53a to the side surface of the fixed cam 53 in accordance with the movement of the fixed cam 53, whereby the rod 51
c is driven to the shortening side. Then, in response to the shortening of the rod 51c, the oil liquid in the oil chamber of the cylinder body 51a is pressure-fed to the oil chamber side of the actuator 50 through the pipe 52, and the rod 50c of the actuator 50 is extended.

In the third embodiment, as shown in FIG. 12, the cam follower 54 provided on the pumping cylinder 51 is fixed just before the pad 12 descending first presses the work W onto the lower mold 11. It is lifted on the side of the cam 53 and the
The oil liquid is supplied to the support base 43, thereby raising the support base 43,
Guide cylinder 41, movable die 16 and cushion 42 thereof
Are positioned at a predetermined rising end. At this time, the alignment type 2
Each of the movable pieces 30 of 0 just fits into the tapered hole 41a of the guide cylinder 41, and each of the movable pieces 30 moves in the closing direction, so that the approaching mold 20 is in a reduced diameter state. Then, the punching punch portion 18a of the punch 18 descending following the pad 12 cooperates with the movable die 16 to form a pilot hole Wa in the work W.

After the above-described punching is completed, the punch 18 continues to descend, whereby the tapered shoulder 18b of the punch 18 presses the edge around the pilot hole Wa of the work W downward as shown in FIG. And the edge rises along the cylindrical first receiving surface 30a of the movable piece 30 of the shift mold 20,
The cylindrical portion Wb is created in the work W, and the burring is completed. At this time, the movable die 16 is pushed down by the punch 18 and descends while compressing the spring 42b of the cushion 42.

At the same time when the burring process is completed, the upper die 12 reaches the bottom dead center.
Starts to rise. As a result, as shown in FIG. 14, the movable die 16 rises under the urging force of the spring 42b of the cushion 42, and the tapered shoulder portion 16b of the movable die 16 gradually moves the tip of the cylindrical portion Wb of the work W. The workpiece W is spread and pressed against the tapered second receiving surface 30b of the movable piece 30 of the approaching die 20, whereby an enlarged portion Wc is created at the tip of the cylindrical portion Wb of the work W, and the curling process is completed. I do.

Thereafter, as shown in FIG.
Rises, and the inclined cam surface 53 of the fixed cam 53
The cam follower 54 at the rod end of the pumping cylinder 51 moves to the position a, and the oil liquid is returned from the oil chamber of the actuator 50 to the pumping cylinder 51, whereby the piston 50 b of the actuator 50 moves down and is integrated with the support base 43. The guide cylinder 41 descends. As a result, the alignment type 20
Of the movable piece 30 protrudes from the guide cylinder 41, and each movable piece 30 moves in the opening direction by the urging force of the leaf spring 32,
The approach mold 20 is enlarged in diameter, and the first receiving surface 30 of each movable piece 30 is formed.
a and the second receiving surface 30b come off the workpiece W, and the upper mold 12
Keeps rising and reaches the top dead center. That is, punching and burring are completed in the lowering process from the top dead center to the bottom dead center of the upper die 12, and curling processing is completed in the ascending process from the bottom dead center to the top dead center of the upper die 12. ,
The panel 4 is completed within one step of pressing. In the present embodiment, a cylinder mechanism using hydraulic pressure is used for the actuator 50. However, as a mechanism for mechanically linking with the upper mold, a link mechanism and a cam mechanism perform the same function. Can be used as

[0038]

As described above, according to the press die for combined machining according to the present invention, three processes of punching, burring, and curling can be performed continuously in one press step. This has the effect of achieving a significant improvement in productivity as well as a significant reduction in cost.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a structure of a press die for combined machining as a first embodiment of the present invention.

FIG. 2 is an enlarged sectional view showing a part of the press die shown in FIG.

FIG. 3 is a plan view showing a structure of an approach die used in the press die shown in FIG.

FIG. 4 is a cross-sectional view illustrating a burring process according to the first embodiment.

FIG. 5 is a cross-sectional view illustrating a curling process according to the first embodiment.

FIG. 6 is a sectional view showing a final step according to the first embodiment.

FIG. 7 is a cross-sectional view illustrating a structure of a press die for combined machining according to a second embodiment of the present invention.

FIG. 8 is an enlarged sectional view showing a part of the press die shown in FIG. 7;

FIG. 9 is a cross-sectional view showing a burring process according to a second embodiment.

FIG. 10 is a cross-sectional view showing a curling process according to a second embodiment.

FIG. 11 is a sectional view showing a final step according to the second embodiment.

FIG. 12 is a cross-sectional view showing a structure of a press die for combined machining as a third embodiment of the present invention.

FIG. 13 is a cross-sectional view illustrating a burring process according to a third embodiment;

FIG. 14 is a cross-sectional view showing a curling process according to a third embodiment.

FIG. 15 is a sectional view showing a final step according to the third embodiment.

FIG. 16 is a cross-sectional view showing a structure of a panel to be processed according to the present invention.

FIG. 17 is a cross-sectional view sequentially showing processing steps for processing the panel shown in FIG. 16;

[Explanation of symbols]

4 panel, 11 lower die, 12 upper die, 14 fixed die 16 movable die, 17 pad, 18 punch,
Reference Signs List 20 alignment type 21 actuator supporting movable die 23 pumping cylinder 26, 53 fixed cam, 27, 54 cam follower 30 movable piece, 30a first receiving surface, 30 second
Receiving surface of 31 support, 32 leaf spring, 35 spring 40 actuator supporting the closing die 41 guide cylinder 42 cushion supporting the movable die 50 actuator supporting the guide cylinder and the movable die W Work, Wa pilot hole, Wb cylindrical Department, Wc
Enlargement section

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code FI B30B 15/02 B30B 15/02 B

Claims (2)

[Claims] 1. A lower die having a die, an upper die having a pad for pressing a work on the lower die and a punch for punching a hole in the work in cooperation with the die. Along with the support, a collet type that expands and contracts in a collet type around the punch is arranged in the pad,
The closing die has a first receiving surface for burring an edge of the pilot hole in cooperation with the die, and a cylindrical portion formed by the burring processing for curling in cooperation with the punch. A press receiving die for combined machining, wherein a second receiving surface is provided and said punching die is enlarged and reduced in diameter in accordance with the separation and seating of said punch with respect to said lower die. 2. A lower die having a die, an upper die having a pad for pressing a work on the lower die and a punch for forming a hole in the work in cooperation with the die, wherein the die is provided on a cushion. Along with the support, a collet type enlarging and contracting in a collet type around the die and a guide cylinder surrounding the collet type are arranged in the lower die, and the collet type cooperates with the punch to form the lower die. A first receiving surface for burring the edge of the hole, and a second receiving surface for curling a cylindrical portion formed by the burring in cooperation with the die; A press die for combined machining, wherein the diameter of the shift die is enlarged and reduced by relative movement with respect to a guide cylinder.