JP2927171B2 - Composite press mold - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improved composite press die capable of performing a plurality of different types of processing in one shot, for example, bending and punching.

[0002]

2. Description of the Related Art Conventionally, as a composite press die capable of performing a plurality of processings in one shot, for example, Japanese Utility Model No. 1-8
No. 0221 is disclosed in FIG.
This will be described with reference to FIG. As shown in the figure, the composite press die for bending and punching includes a pad 51 for pressing and holding the work W on an upper die not shown, and a drive cam 52 having a pair of cam surfaces 52a and 52b. I have. Further, a double cam 53 is provided in the lower mold not shown so as to be movable in the horizontal direction, and a passive cam 54 is provided inside the double cam 53 so as to be movable in the horizontal direction. And
When the drive cam 52 descends, its cam surfaces 52a, 52b
Are cam surfaces 53a and 54 of the double cam 53 and the passive cam 54.
The double cam 53 and the passive cam 54 are moved in the horizontal direction and in the opposite directions to each other by sliding in the direction a. The double cam 53 is provided with a die 56 for performing a bending process on the workpiece W in cooperation with a bending blade 55 provided on the passive cam 54, and the passive cam 54 is provided with a horizontal cutting tool that is movable in the horizontal direction. 57,
Further, at the lower end of the drive cam 52, the drive cam 52
The rotation is regulated when the workpiece W is lifted, and
The latch 58 that presses to the side is rotatably mounted.

When the upper die is lowered from the open state shown in FIG. 13, the passive cam 54 is horizontally moved by the drive cam 52 as shown by the imaginary line in the composite press die for bending and punching described above. The work W is bent in cooperation with the bending blade 55 and the die 56. At this time, since the latch 58 abuts on the holding member 59 of the punching blade 57 and rotates against the spring force of the coil spring 60, the punching blade 57 is not moved. In the lower dead center state shown in FIG. 14, the latch 58 that has passed through the holding member 59 of the punching blade 57 is returned to the initial position by the coil spring 60, and when the upper die is raised from this state, as shown in the phantom line in the drawing. , The rotation of the latch 58 is restricted, and the drive cam 5
With the rise of 2, the pushing blade 57 is pressed toward the workpiece W. Then, a punching process by the punching blade 57 is performed on the edge of the workpiece W where the bending process is performed, and a hole is formed. As described above, the conventional composite press die for bending and punching is configured such that the workpiece W is bent in the lowering step of the upper die and the punching processing is performed in the lifting step.

[0004]

However, in the above-described conventional composite press die, when the upper die is lowered, the latch 5
8 comes into contact with the holding member 59 of the punching blade 57 and is rotated against the coil spring 60. When the latch 58 rotates, the coil spring 60 is subjected to not only an axial force but also a radial external force. Thus, the spring 60 tends to be fatigued and has a problem in durability. When the upper die is raised, the latch 58 presses the holding member 59 to perform the punching process by the punching blade 57. At this time, a horizontal pressing reaction force acting on the latch 58 is applied to the support shaft of the latch 58. 61
Therefore, the load on the support shaft 61 is large and there is a problem in its durability. That is, the conventional composite press mold had a slight difficulty in durability.

The present invention has been made in view of the above-mentioned problems, and has an object to perform a plurality of different types of processing stepwise during the lowering step of the upper die. In addition, a highly durable composite press die is provided.

[0006]

To achieve the above object, the present invention is configured as follows. That is, the composite press die according to the present invention includes, in the upper die, a pad for pressing and holding a work, a fixed drive cam having a cam surface, and a movable drive cam having a cam surface movable in a horizontal direction, The lower die has a first passive tool having a first processing tool at the tip end in the direction of pressing movement by sliding on the cam surface of the movable drive cam when the movable drive cam is lowered. And a second passive cam having a second working tool at a tip end in the pressing and moving direction while sliding on a cam surface of the fixed drive cam when the fixed drive cam is lowered. When the first passive cam is pressed and moved, the movable drive cam slides in contact with a part of the passive drive cam to prevent horizontal movement of the movable drive cam,
A back-up unit that releases the blockage during a period from the lowering of the movable drive cam to the bottom dead center to allow the movable drive cam to retreat in the direction opposite to the pressing movement direction of the first passive cam; And,
The processing operation of the workpiece by the second processing tool is set to be performed during the retreat movement of the movable drive cam after the processing operation of the first processing tool is completed.

[0007]

In the composite press die according to the present invention constructed as described above, the movable drive cam is prevented from moving in the horizontal direction by the backup portion when the upper die is lowered. Therefore, the first passive cam is pressed and moved in the horizontal direction by the movable drive cam, and the first processing tool provided on the first passive cam performs predetermined processing on the workpiece. At this time, the second processing tool provided in the second passive cam has not reached the work, and therefore does not perform processing.

When the processing by the first processing tool is completed, the movable drive cam is released from the horizontal movement prevention by the backup portion. Therefore, since the movable drive cam is lowered while horizontally moving in the direction opposite to the pressing direction, the first passive cam is stopped at the movement position. During this time, the second passive cam is pressed and moved in the horizontal direction by the fixed drive cam, so that the second processing tool performs predetermined processing on the workpiece.

[0009]

As described above, according to the composite press die of the present invention, a plurality of different types of processing such as bending and punching are performed on the work in the lowering step of the upper die. Since it can be performed, effects such as reduction of mold cost, improvement of workability, and improvement of productivity can be obtained. In particular, since the composite press die of the present invention is composed of a combination of a plurality of drive cams and a plurality of passive cams, and all of the working operation methods are sliding methods, a load acting on a spring used for returning these members is used. Direction is stable, effective in reducing its fatigue, and because the load acting on the movable drive cam is received by the backup part, it is possible to easily secure the strength and ensure high durability. A press die is obtained.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be specifically described below with reference to the drawings. First, a composite press die according to a first embodiment configured to perform a bending process and a punching process is shown in FIG.
This will be described with reference to FIG. A pad 2 capable of pressing a workpiece W to be lowered and a cam surface for pressing and moving a first passive cam 7 mounted on a lower die 6 in a horizontal direction are provided on an upper mold 1 which is moved up and down by a ram (not shown). A movable drive cam 3 having a 3a and a fixed drive cam 4 having a cam surface 4a for horizontally pressing and moving a second passive cam 8 mounted on the first passive cam 7 are attached. The movable drive cam 3 is mounted on the upper die 1 so as to be slidable in the horizontal direction, and is held at the initial position by the returning coil spring 5 in the die-open state shown in FIG.

A first passive cam 7 is mounted on the lower die 6 so as to be slidable in the horizontal direction, and a second passive cam 8 is mounted on the first passive cam 7 so as to be slidable in the horizontal direction. . In the opened state, the first passive cam 7 is held at the initial position by the return coil spring 9, and the second passive cam 8 is held at the initial position by the return coil spring 10. The movable drive cam 3 is positioned so as to be inserted between a cam surface 7 a formed at one end of the first passive cam 7 and the backup portion 11 of the lower die 6, and the fixed drive cam 4 is connected to the second passive cam 7. It is positioned so as to be inserted between the cam surface 8a formed at one end of the cam 8 and the substantially vertical pressure receiving surface of the backup portion 7b formed on the first passive cam 7.

The backup unit 11 is a movable drive cam 3
The lower die 6 receives the pressing reaction force generated when the first passive cam 7 is pressed, and holds the movable drive cam 3 at the initial position.
Formed. The backup portion 11 includes a substantially vertical pressure receiving surface 11a and a drive cam retreating inclined surface 11b formed below the pressure receiving surface 11a. 3 is set equal to the inclination angle of the cam surface 3a. Then, on the side of the movable drive cam 3 facing the backup unit 11,
Vertical surface 12a on the lower side corresponding to backup unit 11
And a stroke plate 12 provided with an inclined surface 12b for evacuation on the upper side.

That is, when the movable drive cam 3 is lowered, it is prevented from moving in the horizontal direction by sliding contact between the pressure receiving surface 11a of the backup portion 11 and the vertical surface 12a of the stroke plate 12 until the movable drive cam 3 is moved down to the initial position. Although held, the vertical surfaces 12a are allowed to move in a direction opposite to the pressing direction by the inclined surfaces 11a and 12a from the time when the vertical surface 12a is disengaged from the pressure receiving surface 11a until the bottom dead center.
The backup portion 7b formed on the first passive cam 7
Receives the pressing reaction force of the fixed drive cam 4 over the entire stroke.

The lower die 6 is provided with a die holder 13 at a position facing the first and second passive cams 7 and 8, and the die holder 13 eliminates the negative angle due to the bending process to form the workpiece W. An air cylinder (not shown), which is electrically controlled to facilitate removal, is movable in the horizontal direction. A die 1 is provided on the die holder 13 for performing a bending process and a punching process on the edge of the work W.
The dies 14 and the die holder 13 are provided with waste holes 13a and 14a for discharging chips generated by the punching process.

The first passive cam 7 is provided with a bending blade 15 as a first processing tool for bending the edge of the work W in cooperation with the die 14 at the distal end in the moving direction. I have. The second passive cam 8 is provided with a punch 16 as a second processing tool for performing a punching process on an edge portion of the workpiece W bent toward the distal end in the moving direction.
The punch 16 is positioned at a position where the tip of the punch 16 is immersed in the through hole 15 a formed in the bending blade 15 in the mold open state, and the punching process for the workpiece W is performed by the bending blade 1.
5 after the completion of the bending process. In addition, the bending blade 15 also serves as a pad at the time of punching. In the drawing, reference numeral 17 denotes a cushion cushion stopper at the end of the stroke of the bending blade 15.

The composite press die according to the present embodiment is configured as described above, and the processing operation of the work W will be described below. As shown in FIG. 1, in a mold open state in which the upper die 1 is raised, the work W is placed on the lower die 6, and then the air cylinder is operated to move the die holder 13 to the first position.
It is advanced toward the passive cam 7 side to the specified processing position shown in FIG. Subsequently, when the upper die 1 is lowered, the work W on the die 14 is pressed and held by the pad 2 and the movable drive cam 3 is moved between the first passive cam 7 and the backup unit 11 as shown in FIG. The cam surface 3a of the movable drive cam 3 slides on the cam surface 7a of the first passive cam 7, and the first passive cam 7 is pressed and moved toward the work W.
At this time, the stroke plate 1 of the movable drive cam 3
The second vertical surface 12a is the pressure receiving surface 11a of the backup unit 11.
And the pressing reaction force of the movable drive cam 3 is received.

As shown in FIG. 3, the biasing blade 15 of the first passive cam 7 and the die 14 approach each other by the pressing movement of the first passive cam 7, and the pad 2 and the die 2 cooperate with each other. The workpiece W held by the die 14 is subjected to a bending process. On the other hand, as shown in FIG. 2, the fixed drive cam 4 descending integrally with the upper die 1 is moved downward between the moving second passive cam 8 and the backup portion 12 of the first passive cam 7, Then, as shown in FIG. 3, the cam surface 8 a is brought into contact with the cam surface 8 a of the second passive cam 8 shortly before the bending process by the bending blade 15 is completed.

When the bending of the work W by the bending blade 15 is completed, the vertical surface 12a of the stroke plate 12 of the movable drive cam 3 is moved to the backup portion 1.
1 is released from the pressure receiving surface 11a, thereby preventing the backup unit 11 from moving in the horizontal direction. Therefore, when the upper die 1 further descends, the movable drive cam 3 retreats along the slopes 11a and 12a as shown in FIG.
The first passive cam 7 is stopped at the machining completion position. Therefore, after that, the cam surface 4 of the fixed drive cam 4
a slides on the cam surface 8a of the second passive cam 8 to press and move the second passive cam 8. Then, the punch 16 protrudes from the through hole 15a of the bending blade 15, and performs the punching process on the bent edge of the workpiece W.

At this time, the bending blade 15 functions as a pad for holding the work W. Chips generated by the punching process are discharged from the waste holes 13a and 14a. Then, when the punching process is completed, the upper die 1 reaches the bottom dead center. In this case, after the bending process, the composite press die of the present embodiment retracts the movable drive cam 3 in the direction opposite to the pressing direction, and performs the punching process while holding the first passive cam 7 at the processing position. Therefore, there is no large load fluctuation. Therefore, there is no need to change the pressing force applied to the upper mold 1, and the pressing force can be kept constant.

When the drawing operation is completed, the upper die 1 is thereafter raised. This raise causes the fixed drive cam 4 to separate from the second passive cam 8 and the movable drive cam 3 to tilt the backup portion 11. Due to the pressing by the surface 11b and the spring force of the coil spring 5, it returns to the position before the retreat movement and rises and separates from the first passive cam 7, so that the respective cams are returned to the initial position by the coil springs 9, 10. When the upper die 1 reaches the top dead center and is stopped, the pressing and holding of the work W by the pad 2 is released, and the die holder 13 is returned to the initial position by the air cylinder.
The work W is taken out. Thus, one processing operation is completed.

As described above, according to the composite press die of the present embodiment, the bending process and the punching process can be performed stepwise by the lowering operation of the upper die 1. Therefore, when the upper mold 1 is lifted, no machining work is required, so that a rapid rise becomes possible,
Unlike the method of performing the punching process at the time of ascent, the cycle time can be shortened and the productivity can be increased. Further, the composite press die of this embodiment has a movable drive cam 3.
And all of the first and second passive cams 7, 8 are linear sliding systems, and the directionality of the load acting on the returning coil springs 5, 9, 10 of these members is stabilized.
The configuration is effective for reducing the fatigue, and the backup reaction portion 11 receives the pressing reaction force acting on the movable drive cam 3, so that the strength can be easily secured. Further, in the present embodiment, the second passive cam 8 is attached to the first passive cam 7, which is advantageous in achieving a compact structure.

Next, a second embodiment of the present invention will be described with reference to FIGS.
It will be described based on. This embodiment is suitable for a case where two kinds of holes, for example, a countersunk hole and a seal hole (a punched hole) are formed in a portion close to the work W, and where the seal hole is provided depending on the work W and is punched separately without the work W. Related to a complex press die. That is, in this embodiment, the first processing tool is changed from the bending blade 15 to the punch 18 for countersink, the second processing tool is changed from the punch 16 for punching to the punch 19 for seal hole, The punching of the holes is performed by changing the stroke of the upper die 1.
The other configuration except for this point is the same as that of the above-described first embodiment. Therefore, the same or equivalent components as those of the first embodiment are denoted by the same reference numerals, and the description thereof will be simplified or omitted.

A pad 2, a movable drive cam 3, and a fixed drive cam 4 are attached to the upper die 1. In the present embodiment, a second passive cam 8 pressed and moved by the fixed drive cam 4 is attached to the lower die 6 so as to be horizontally slidable. The second passive cam 8 is pressed and moved by the movable drive cam 3 on the second passive cam 8. One passive cam 7 is mounted so as to be horizontally slidable. In addition, the lower die 6 is formed with a backup portion 11 having a pressure receiving portion 11a for receiving a pressing reaction force of the movable drive cam 3 and a retreating inclined surface 11b, and a die 13
Is mounted.

A countersunk hole punch 18 for making holes in all the works W is mounted on the first passive cam 7, and a seal hole punch 19 for punching holes by the works W is mounted on the second passive cam 8. Installed. At the initial position, the countersunk hole punch 18 is set at a position closer to the work W than the seal hole punch 19. In the present embodiment, as shown in FIG. 12, the second passive cam 8 is formed in a substantially inverted gate shape, and the first passive cam 7 is disposed in the concave portion thereof. The movable drive cam 3 and the fixed drive cam 4 for pressing and moving the cam are also mounted on the upper die 1 in a form corresponding to this. The die holder 13 has a fixed structure with respect to the lower die 6.

FIG. 5 shows an open state of the movable drive cam 3 and the first passive cam 7, and FIG. 9 shows an open state of the fixed drive cam 4 and the second passive cam 8.
As shown in the figure, when the work W is set on the lower die 6 and the upper die 1 is lowered, the cam surface 3a of the movable drive cam 3 is fixed to the cam surface 7a of the first passive cam 7 with a slight delay. The cam surface 4a of the cam 4 slides on the cam surface 8a of the second passive cam 8. That is, the pressing movement of the first passive cam 7 precedes, the countersunk hole punch 18 approaches the work W more than the seal hole punch 19, and thereafter, as shown in FIGS. , 8 are integrally pressed and moved toward the work W. At this time, the movable drive cam 3 descends in a state where the vertical surface 12a of the stroke plate 12 slides on the pressure receiving surface 11a of the backup portion 11 and receives the pressing reaction force. And, by this lowering operation, FIG.
As shown in (1), the work W is subjected to countersinking by the countersink punch 18.

When this countersinking is completed, the vertical surface 12a of the stroke plate 12 of the movable drive cam 3 is disengaged from the pressure receiving surface 11a of the backup portion 11, and thereafter the movable drive cam 3 is inclined by the inclined surfaces 12b, 11b. Along the direction opposite to the pressing direction. Therefore, the first passive cam 7 is stopped at the machining end position. At this time, if the seal hole is not formed in the work W,
The stroke of the upper die 1 is adjusted in advance so that the countersunk hole processing end position by the countersunk hole punch 18 or a position slightly lower than the position is the bottom dead center of the upper die 1. Therefore, the upper die 1 starts to move upward after countersinking.

On the other hand, in the case of forming a seal hole in the work W, the stroke is adjusted so that the lowering operation of the upper mold 1 is continued even after forming the countersink hole. At this time, the pressing and moving operation of the second passive cam 8 by the fixed drive cam 4 is continuously performed thereafter, and as shown in FIG. 11, by the seal hole punch 19 provided at the tip of the second passive cam 8. Seal hole processing is performed. During this time, as shown in FIG. 8, the movable drive cam 3 continues the retreating movement, and the first passive cam 7 remains stopped. Then, when the seal hole processing by the seal hole punch 19 is completed, the upper die 1 shifts to the ascending step, and all the members are returned to the initial positions.

As described above, according to the second embodiment, when performing two types of hole processing on the work W, the countersink hole and the seal hole,
For the seal holes, the stroke of the upper die 1 can be changed by changing the stroke of the upper die 1, that is, by adjusting the position of the bottom dead center of the upper die 1.

According to this embodiment, since the seal holes can be separated by changing the stroke of the upper mold 1, the number of molds can be reduced as compared with, for example, processing in two steps or punching by exchanging punches. Can be reduced, the problem of mold replacement error can be eliminated, and the operation for punching is easy, which leads to an improvement in productivity.

In the second embodiment, the first passive cam 7 and the second passive cam 8 may be individually slidably mounted on the lower die 6.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a composite press die according to a first embodiment of the present invention, showing a mold open state.

FIG. 2 is an operation mode diagram showing an upper mold halfway down.

FIG. 3 is an operation state diagram showing a state at the time of completion of a bending process.

FIG. 4 is an operation mode diagram showing a state at the time of completion of the punching process.

FIG. 5 is a longitudinal sectional view of a movable drive cam and a first passive cam of a composite press type according to a second embodiment of the present invention;
This shows the mold open state.

FIG. 6 is an operation mode diagram showing an upper mold halfway down;

FIG. 7 is an operation state diagram showing a state in which countersink processing is completed.

FIG. 8 is an operation state diagram showing a state at the time of completion of processing of a seal hole.

FIG. 9 is a longitudinal sectional view of a fixed drive cam and a second passive cam of a composite press type according to a second embodiment of the present invention;
This shows the mold open state.

FIG. 10 is an operation mode diagram showing the upper mold halfway down.

FIG. 11 is an operation state diagram showing a state at the time of completion of sealing hole processing.

FIG. 12 is a perspective view showing a first passive cam and a second passive cam.

FIG. 13 is a vertical cross-sectional view showing a conventional composite press mold, showing a mold open state.

FIG. 14 is a vertical cross-sectional view showing a conventional composite press die, showing a state at the time of completion of processing.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Upper mold 2 ... Pad 3 ... Movable drive cam 4 ... Fixed drive cam 6 ... Lower mold 7 ... 1st passive cam 8 ... 2nd passive cam 11 ... Backup part 12 ... Stroke plate 15 ... Bending blade 16 ... Punch

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) B21D 28/34 B21D 5/01 B21D 37/08

Claims (1)

(57) [Claims] An upper mold includes a pad for pressing and holding a work, a fixed drive cam having a cam surface, and a movable drive cam having a cam surface movable in a horizontal direction. movable Dora at the time of the movable drive cam falling
A first passive cam having a first processing tool at the tip end side in the pressing and moving direction while sliding on the cam surface of the ebu cam and being pressed and moved in the horizontal direction, when the fixed drive cam descends
The fixed drive cam slides on the cam surface and is pressed and moved in the horizontal direction.
A second passive cam having a working tool, slidingly contacting a part of the passive drive cam when pressing and moving the first passive cam, preventing horizontal movement of the movable drive cam; A backup portion that releases the blockage until the dead center and allows the movable drive cam to retreat in a direction opposite to the pressing and moving direction of the first passive cam; A composite press die set so that a processing operation on the workpiece by a tool is performed during a retreat movement of the movable drive cam after the processing operation of the first processing tool is completed.