JPS63248525A - Die apparatus - Google Patents

Abstract

PURPOSE:To perform the drawing and bending of a laminar work with a single die by providing an auxiliary punch capable of changing its height and a blank holder on a lower main punch and by providing an auxiliary die energized by a spring on an upper main die. CONSTITUTION:The auxiliary punch 64 supported by holding members 54 (a-d) to advance or retreat by cylinders 50 (a-d) and devided into plural parts and a blank holder 82 freely capable of changing its height by attaching and detaching a cushion 78, are provided on the periphery of the main punch 36 of the lower die 32. Further, the cushion 100 and the energized auxiliary die 88 are fitted on the main die 88 of the upper die 34. The laminar work is drawn by this composite die apparatus 30. Then, the holding member 54 (a-d) are retreated, the auxiliary punch 64 is made possible to descend by the cushion 60 (a-f), the blank holder 82 is descended by removing the cushion 78 to press the drawing work, then the bending of the periphery is performed by a vertical face 40a of the main punch 36 and the periphery part 89a of the main die 88. The drawing and bending work are performed by the single die to reduce the cost of the die apparatus.

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a mold device for press working of a plate-like work, and more specifically, a mold device that can be positioned and held under the action of a fixed first punch and an actuator. A movable second punch is provided, and a first die and a second die that engage with the first and second punches are configured to be mutually displaceable so that a desired punch and die can be selected. The present invention relates to a mold device that allows different processing operations such as drawing and bending to be performed independently with a single mold device.

[Background of the Invention] In general, press molding is widely used when molding a plate-like work into a desired shape.

For example, outer panel parts constituting an automobile body are usually processed using the following procedure.

That is, first, a blank material having a predetermined shape is taken out of a thin steel plate, and a curved surface corresponding to the shape of the outer panel of the vehicle body is formed by applying press working to this blank material using a drawing die device. Furthermore, after removing unnecessary parts from the blank material after drawing processing using a trimming mold device, holes are drilled into the outer plate into the desired shape using a processing mold device or a bending mold device. Molding parts.

In this way, various different mold devices such as a drawing mold device, a trimming mold device, and a bending mold device are used when molding the outer panel parts that constitute an automobile body. ing.

In this case, various mold devices have conventionally been used as the drawing mold device, and for example,
The technical idea is disclosed in No. 104015. This is shown in FIG.

That is, in the figure, reference numeral 2 indicates a drawing mold device according to the prior art, and the mold device 2 basically consists of a lower mold 4 and an upper mold 6. A punch 8 that bulges vertically upward in the figure is formed approximately in the center of the lower die 4, and a plurality of blank holders 10 are slidably disposed outside the punch 8. There is. In this case, a rod 12 is connected to one end of the blank holder 10,
This rod 12 passes through the lower mold 4, and a coil spring 14 is fitted onto the outside. Also, blank holder 1
A recess 16 is formed at the other end of the recess 16 .

On the other hand, the upper mold 6 is provided with a die surface 18 that is curved to correspond to the punch 8, and a bead 20 that engages with the recess 16 is formed on the outside of the die surface 18.

In such a configuration, a blank material 22 made of a thin steel plate is placed between the lower mold 4 and the upper mold 6, and the lower mold 4 and the upper mold 6 are moved relatively close to each other. Therefore, the blank holder 10 and the upper die 6 press the blank material 22 through the elastic force of the coil spring 14, and the bead 2 is formed in the recess 16.
0 engages and the blank material 22 is held. Furthermore, as the lower die 4 and the upper die 6 are displaced close to each other, the punch 8
The blank material 22 is curved into a desired shape via the die surface 18 and the die surface 18.

Next, the lower mold 4 and the upper mold 6 are relatively displaced, and the blank material 22 that has been subjected to the desired drawing process is taken out and placed in a trimming mold device (not shown), and the blank material 22 is removed from the blank material 22. Cut and remove unnecessary parts. Further, the outer peripheral end of the blank material 22 is bent inward by a bending die device (not shown).

By the way, the above-mentioned mold equipment W2 is used as a mold equipment exclusively for drawing the blank material 22. Therefore, in order to obtain a desired outer panel part of an automobile body from the blank material 22, a trimming mold device, a bending mold device, etc. must be prepared in addition to the mold device 2 described above. No. Therefore, it is pointed out that a plurality of different mold devices are required when molding a single outer panel part, and the manufacturing cost of the mold devices increases considerably. In particular, when trying to mold a variety of different exterior panel parts through low-volume production of multiple models, a considerable number of mold devices are required to process each exterior panel component, which is economically unacceptable. This will cause inconvenience. Moreover, a large number of mold apparatuses must be disposed within the workshop, resulting in the disadvantage that the space within the workshop cannot be utilized effectively.

Therefore, a mold apparatus has been proposed that is configured to perform two different work processes, for example, a drawing process and a bending process in a single process. However, if drawing and bending are performed in the same process, an unnecessarily large pressurizing force will act on the forming surface where the drawing is performed for the bending, and this may cause damage to the forming surface. Distortion etc. will occur. In this case, especially for those that have the appearance of a product, such as outer panel parts that constitute an automobile body, there is a problem in that the outer panel parts that have the above distortion become unusable. do.

[Object of the Invention] The present invention has been made in order to overcome the above-mentioned disadvantages, and includes a first punch that is provided with a fixed main punch and a movable auxiliary punch that can be positioned and held under the action of an actuator.
and a second mold having a main die that engages with the auxiliary punch and a displaceable auxiliary die that engages with the main punch, and the auxiliary punch is arranged integrally with the main punch. A first process is performed on the plate-shaped workpiece through the main die and the auxiliary die that engage with these, and the auxiliary punch is made freely displaceable under the action of the actuator, and the plate-shaped workpiece is processed by the main punch and the main die. By performing the second processing, for example, two different processes, such as drawing and bending, can be performed independently with a single mold device. Moreover, unlike conventional methods, separate molds can be It is an object of the present invention to provide a mold device that can reduce manufacturing costs at once compared to a mold device that is equipped with a device, and can minimize the occupied space as much as possible.

[Means for Achieving the Object] In order to achieve the above-mentioned object, the present invention provides a mold device for performing press forming on a plate-shaped work, which includes a main punch and an end portion of the main punch. a first mold including an auxiliary punch which is disposed and can be positioned and held under the action of an actuator; a main die which can be freely engaged with the auxiliary punch; and a main die which can be engaged with the main punch and can be freely displaced with respect to the main die. and a second mold including an auxiliary die, the main punch and the auxiliary punch are integrally engaged with the main die and the auxiliary die to perform the first processing on the plate-shaped workpiece, and the actuator is also operated. The holding action of the auxiliary punch is released and the auxiliary punch is freely displaceable so that the auxiliary die presses and holds the plate-shaped workpiece, and the main die and the main punch perform a second processing on the plate-shaped workpiece. Features.

[Embodiments] Next, preferred embodiments of the mold device according to the present invention will be described in detail with reference to the accompanying drawings.

In FIG. 2, reference numeral 30 indicates a mold device according to the present invention, and the mold device 30 basically consists of a lower mold 32 and an upper mold 34.

A main punch 36 is formed substantially at the center of the lower die 32 and bulges vertically upward in the figure, and a circumferential step 38 is provided above the main punch 36. In this case, the vertical surface 40a defining the step 38 corresponds to the outer peripheral shape of a plate-shaped workpiece, for example, a bonnet, as shown in FIG. □It is curved to correspond to the curved shape. Furthermore, openings 44a and 44b are formed in the vertical surface 40a so as to pass through the interior of the main punch 36, and horizontal surfaces 46a and 46 defining the openings 44a and 44b are formed in the vertical surface 40a.
Grooves 48a, 48a and 48b14 are cut by cutting a predetermined length inward of the horizontal surface 40b defining the step 38.
8b (see FIGS. 3 and 4).

Therefore, as shown in FIG. 2, a support plate 49a is disposed within the opening 44a so as to be located on the same plane as the horizontal surface 46a, and the cylinders 50a and 50b are arranged on the support plate 49a in a direction that separates them from each other. Orient and place it. Rectangular holding members 54a, 54b are fixed to piston rods 52a, 52b extending outward from the main punch 36 from the cylinders 50a, 50b, respectively, and the upper corner corners of the holding members 54a, 54b are There are inclined surfaces 56a and 56b in the section.
is formed.

In this case, as shown in FIG.
, 54b are groove portions 48a, 48 defined in the horizontal surface 40b.
Fits into a.

On the other hand, similarly to the opening 44a described above, cylinders 50c and 50d are disposed in the opening 44b so as to be oriented in a direction that separates them from each other via a support plate 49b, and a holding member is attached to each piston rod 52c and 52d. 54c and 54d are engaged. The holding members 54c and 54d are formed with inclined surfaces 56c and 56d, and each of the holding members 54c and 54d is formed with a groove 48b defined in the horizontal surface 40b.
, 48b.

In addition, holes 58a to 58f are bored at predetermined positions in the horizontal surface 40b defining the stepped portion 38 to a predetermined depth, and a cylindrical cushion 60 made of urethane or the like is formed.
Guide pins 62a to 62f attached to a to 60f
are loosely fitted into the holes 58a to 58f. Therefore, the cushions 60a to 60f are connected to the guide pin 6.
It is detachably attached to the horizontal surface 40b via 2a to 62f.

Next, the auxiliary punch 64 is displaceably attached to the upper part of the main punch 36. The auxiliary punch 64 is the main punch 3
The main punch 36 has an inner wall surface 66 in sliding contact with the vertical surface 40a of the main punch 36, and an upper surface portion 68 thereof is continuous with the upper surface portion 42 of the main punch 36 and curved. Further, a groove portion 48a defined in the horizontal surface 40b of the main punch 36 is provided in the bottom surface portion 70 of the auxiliary punch 64.
, 48b, respectively, and escape holes 74a to 74f are bored to a predetermined depth in positions corresponding to the holes 58a to 58f, respectively. (See Figure 4).

Furthermore, a plurality of holes 76 are formed in the lower die 32 outside the main punch 36, and a plurality of cushions 78 made of urethane or the like are removably disposed through the holes 76. In this case, a guide pin 80 is attached to the cushion 78, and one end of the guide pin 80 is fitted into the hole 76, and the other end is connected to a plurality of holes formed in the blank holder 82. It is engaged with the portion 83. As shown in FIG. 3, the blank holder 82 is disposed so as to surround the main punch 36, and a circumferential groove 84 is formed in an upper surface 82a of the blank holder 82.

On the other hand, the upper mold 34 includes a main die 86 and an auxiliary die 88 that is freely displaceable with respect to the main die 86. An opening 89 corresponding to the shape of the vertical surface 40a of the main punch 36 is defined approximately at the center of the main die 86, and a plurality of stepped holes 90 communicate with the opening 89. The peripheral wall surface 89a defining the opening 89 works together with the vertical surface 40a of the main punch 36 to bend the peripheral end of a plate-shaped work (described later), and bends the peripheral edge of the plate-shaped work (described later). The peripheral wall surface 89 corresponds to the thickness.
a is formed to have a larger dimension than the vertical surface 40a.

Furthermore, a die surface 92 that curves in accordance with the shape of the auxiliary punch 64 is formed at the end of the peripheral wall surface 89a of the main die 86, and the end of the die surface 92 engages with the top surface 82a of the blank holder 82. A matching plane portion 94 is integrally provided.

This flat portion 94 has a groove portion 84 of the blank holder 82.
A bead 96 is formed protrudingly to engage with.

Therefore, an auxiliary die 88 is disposed in the opening 89 so as to be freely displaceable. A surface portion 8 corresponding to the vertically downward direction of the auxiliary die 88
8 a has a bent shape corresponding to the upper surface portion 42 of the main punch 36 . Then, a plurality of bolts 98 are inserted into the stepped holes 90 of the main die 86, and the tips of the bolts 98 are screwed into the auxiliary die 88. At that time, a cushion 100 made of urethane or the like is provided between the auxiliary die 88 and the inner wall surface of the main die 86.

In FIG. 2, reference numerals 102a to 102d indicate openings provided to reduce the weight of the mold device 30.

Further, in the mold device 30, cushions 60a to 60
Although the cushion 78 and the cushion 100 are made of urethane, it is of course possible to use other elastic bodies such as coil springs.

The mold device according to the present invention is basically constructed as described above, and its operation and effects will be explained next.

First, the mold device 30 is arranged in the state shown in FIG. 2 in order to draw a plate material 104 as a blank material (plate-shaped work) through the mold device 30.

That is, the piston rods 52a to 52d are respectively displaced toward the outside of the main punch 36 under the biasing action of the cylinders 50a to 50d, and the holding members 54a to 54d, which are attached to the piston rods 52a to 52d, are moved. The main punch 36 is displaced outwardly. Therefore, the holding members 54a to 54d have grooves 48a and 48b formed in the horizontal surface 40b and grooves 7 formed in the auxiliary punch 64.
2a and 72b to position and hold the auxiliary punch 64 (see FIG. 4).

On the other hand, a guide pin 8 is provided in the hole 76 formed in the lower die 32.
0, a plurality of cushions 78 are arranged, and a blank holder 82 is placed on the cushions 78 (.

Therefore, a plate member 104 is disposed between the lower mold 32 and the upper mold 34, and the lower mold 32 and the upper mold 34 are moved relatively close to each other. Therefore, the upper surface portion 42 of the main punch 36 and the auxiliary punch 6
The plate material 104 is drawn through the upper surface portion 68 of the auxiliary die 88, the surface portion 88a of the auxiliary die 88, and the die surface 92 of the main die 86. At that time, the upper surface part 82a of the blank holder 82 and the groove part 84 are connected to the flat part 94 of the main die 86 and the bead 9.
6, the plate material 104 is positioned and held.

Next, the lower mold 32 and the upper mold 34 are relatively displaced, and the plate material 104 after the drawing process is transferred to the mold device 30.
The unnecessary portion is removed by cutting off the unnecessary portion using a trimming device or a trimming laser device (not shown). Furthermore, the plate material 1 which has been subjected to the trimming process
04 is subjected to a desired bending process using the mold device 30.

For this reason, predetermined preparation work is performed on the mold device 30 in order to use it for bending.

That is, under the driving action of the cylinders 50a to 50d, the piston rods 52a to 52d are respectively displaced toward the inside of the main pump 36, and the holding members 54a to 54d, which are attached to the piston rods 52a to 52d, are moved. It is retracted inside the main punch 36. Therefore, the holding members 54a to 54d are attached to the grooves 72a and 72 of the auxiliary punch 64.
b, and the auxiliary punch 64 is removed from the cushion 60a.
60f. As a result, the auxiliary punch 64 can be freely displaced a predetermined distance in the vertical direction via the cushions 60a to 60f. Further, the guide pin 80 attached to the cushion 78 is removed from the hole 76 of the lower mold 32, and by removing the cushion 78, the blank holder 82 is separated from the upper mold 34 and directly attached to the lower mold 32. Leave it there.

After passing through such a preparation stage, the upper surface portion 4 of the main punch 36 is
The plate material 104 after the trimming process is placed at 2, and the lower die 32 and the upper die 34 are moved relatively close to each other. For this reason,
The auxiliary die 88 presses and holds the plate material 104 together with the upper surface portion 42 of the main punch 36 through the elastic force of the cushion 100.
The die surface 92 of the main die 86 presses the auxiliary punch 64 vertically downward. The auxiliary punch 64, as described above,
Since it is held by the cushions 60a to 60f, when pressed by the die surface 92, the cushion 60
It is displaced vertically downward against the elastic force of a to 60f.

As a result, as shown in FIG. 5, the outer peripheral end of the plate 104 is bent vertically downward along the vertical surface 40a of the main punch 36, and the plate 104 is bent. At this time, the cushion 78 is removed from the lower die 32, and the blank holder 82 is effectively separated from the upper die 34 and is not interfered with by the upper die 34.

Then, by relatively displacing the lower die 32 and the upper die 34, the desired plate material 1 which has been subjected to drawing and bending is formed.
04 will be obtained.

In this case, according to the present invention, two different processes, drawing and bending, can be independently performed on the plate material 104 using the single mold device 30. Moreover, the manufacturing cost of the mold device 30 can be reduced as much as possible compared to the conventional method in which separate mold devices are provided.

That is, as described above, the plate material 1 is
04, the auxiliary punch 64 is placed on the holding members 54a to 54d and the auxiliary punch 64 is
is positioned and held integrally with the main punch 36, and a blank holder 82 is placed at a predetermined height position via a cushion 78.

Therefore, while the plate material 104 is pressed and held through the blank holder 82, the upper surface 42 of the main punch 36 and the upper surface 68 of the auxiliary punch 64 are integrally engaged with the surface 88a of the auxiliary die 88 and the die surface 92. A drawing process will be performed on the plate material 104.

On the other hand, when using the mold device 30 as a bending mold device, the cushion 78 is removed and the blank holder 82 is placed in a predetermined retracted position, and the piston rod is moved under the driving action of the cylinders 50a to 50d. 52a
The holding members 54a to 54d are separated from the auxiliary punch 64 by displacing the holding members 54a to 54d inward of the main punch 36. For this reason, the auxiliary punch 64 is used for the cushions 60a to 6
0f, and can be freely displaced in the vertical direction. As a result, the auxiliary punch 64 is displaced vertically downward due to the pressing force of the die surface 92, and the plate material 104 is bent along the vertical surface 40a of the main punch 36. In this case, the auxiliary die 88 is attached to the plate material 10 through the elastic force of the cushion 100.
4, and acts as a pressing pad during the bending process.

In this way, two different processes, drawing and bending, are achieved with the single mold device 30. In particular, since the drawing process and the bending process are performed independently using different parts, the workpiece damage that was caused when the drawing process and the bending process were performed in a single process as in the past. It becomes possible to avoid deformation, distortion, etc., and achieve processing work with excellent quality and accuracy. Moreover, compared to the case where separate mold devices are provided for each processing, the effect that the mold device 30 can be economically manufactured all at once can be obtained. Another advantage is that the space occupied by the mold device in the workplace can be made as small as possible. Furthermore, there is no need to remove the auxiliary punch 64 from the lower mold 32 during bending, and therefore the preparation work in the mold device 30 is further simplified.

[Effects of the Invention] As described above, according to the present invention, a punch for press forming is composed of a fixed main punch and a movable auxiliary punch, and the main punch and the auxiliary punch are integrally formed. The main punch is used to perform a first processing on a plate-shaped workpiece, and then a different second processing is performed on the plate-shaped workpiece using only the main punch. For this reason, a single mold device can perform different processes, such as drawing and bending, for example, and the manufacturing cost of the mold device is lower than when separate mold devices are used for each process. can be significantly reduced.

Moreover, by performing each different processing operation independently using different parts, for example, an unnecessarily large pressure force is not applied to the plate-shaped workpiece, causing distortion, etc. The desired machining process can be achieved with high accuracy for shaped workpieces. Further, there is a substantial effect that the number of mold devices as a whole can be reduced, and the space occupied in the workplace can be made as small as possible.

Although the present invention has been described above with reference to preferred embodiments, the present invention is not limited to these embodiments.
Of course, various improvements and changes in design are possible without departing from the gist of the present invention.

[Brief explanation of the drawing]

FIG. 1 is a vertical cross-sectional view showing a schematic configuration of a mold device according to the prior art, FIG. 2 is a vertical cross-sectional view of a mold device according to the present invention, and FIG. 3 is a vertical cross-sectional view showing a mold device according to the present invention. FIG. 4 is a partial cross-sectional view of the mold device according to the present invention, and FIG. 5 is a vertical cross-sectional view showing the operating state of the mold device according to the present invention.

Claims (5)

[Claims] (1) A mold device for press-forming a plate-shaped workpiece, which includes a main punch and an auxiliary punch that is disposed at the end of the main punch and can be positioned and held under the action of an actuator. a second mold including a main die that can be freely engaged with the auxiliary punch, and an auxiliary die that can be engaged with the main punch and can be freely displaced with respect to the main die. The punch is integrally engaged with the main die and the auxiliary die to perform the first processing on the plate-shaped workpiece, and further, the holding action of the auxiliary punch is released under the action of the actuator, and the auxiliary punch is made freely displaceable by the auxiliary die. A mold apparatus characterized in that the mold apparatus is configured to press and hold the plate-shaped workpiece and perform a second processing on the plate-shaped workpiece using a main die and a main punch. (2) In the device according to claim 1, the actuator is substantially composed of a cylinder, and the cylinder is disposed inside the main punch, and the holder is engaged with a rod extending from the cylinder. and place an auxiliary punch on the holding body, and under the action of the cylinder, the holding body is separated from the auxiliary punch and the auxiliary punch is placed on the elastic body, whereby the auxiliary punch is inserted into the second mold. A mold device configured to move forward and backward. (3) The mold device according to claim 1, wherein the auxiliary die is disposed so as to be freely displaceable inward of the main die via an elastic body. (4) In the apparatus according to claim 1, a blank holder whose height can be adjusted via an elastic body is attached to the first mold provided with the main punch, and the first die is attached to the plate-shaped workpiece. When performing the drawing process, the blank holder and the second
A mold device configured to hold the plate-like workpiece with a mold. (5) In the device according to claim 4, the second
A mold device in which a bead is formed on the mold to engage with a groove provided in a blank holder.