JP2009285680A - Press forming device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a press forming device in which the height of an opening between a main movable blade and a bearing blade is enlarged without enlarging the stroke width of a movable die and without lengthening a cycle time. <P>SOLUTION: This press forming apparatus 1 includes the bearing blade 21, the main movable blade 31, a cam driver 32 and a passive cam 33. The cam driver 32 has a driver sliding part 321 for moving a first cam sliding part 331 which is formed on the passive cam 33 and the passive cam 33 approximately in the horizontal direction when the driver is lowered. The passive cam 33 has a second cam sliding part 332 for raising the bearing blade 21 by sliding on a bearing sliding part 212 formed on the bearing blade 21 when moving back and forth and is provided with a biasing means 330 for biasing the passive cam 33 in the opposite direction to the moving direction accompanying the lowering of the cam driver 32. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a press molding apparatus for molding a workpiece into a molded product.

2. Description of the Related Art Conventionally, a press molding apparatus that molds a workpiece into a molded product is known (for example, see Patent Document 1).
As shown in FIGS. 8 and 9, a forming die 90 constituting the conventional press forming apparatus processes a support blade 921 that supports a workpiece 95 and a workpiece 95 that is supported by the support blade 921. And a main movable blade 931.
When press-molding the workpiece 95 using the press molding apparatus, the main movable blade 931 is lowered (see arrow W in FIG. 8). Then, before the main movable blade 931 contacts the workpiece 95, the pad 932 contacts the upper surface of the workpiece 95 to fix the workpiece 95. Next, the workpiece 95 is press-formed between the main movable blade 931 and the support blade 921 that have been further lowered.

Japanese Patent No. 3816319

  However, the conventional press molding apparatus has the following problems. That is, in the mold 90, as described above, the main movable blade 931 descends, and the workpiece 95 is press-formed between the main movable blade 931 and the support blade 921. Here, when the main movable blade 931 is at the top dead center, the opening height h that is the distance from the lower end of the main movable blade 931 to the upper end of the support blade 921 needs to be at least the height of the molded product. This is because the opening height h becomes a conveyance gap necessary for moving the workpiece 95 to the next step.

Therefore, when the opening height h cannot be secured sufficiently, the workpiece 95 may not be transported to the next process.
Conversely, to obtain a molded product with a high height, it is necessary to increase the opening height h. However, increasing the opening height h increases the stroke and lengthens the cycle time in the molding process. End up.

  Further, in the case where the press molding apparatus is used in a press progressive mold that drives a plurality of different types of molding dies 90 synchronously, in order to change the stroke to a large width to ensure the opening height h, It is necessary to change not only the mold 90 but also the apparatus itself. In this case, a large capital investment is required.

  The present invention has been made in view of such conventional problems, and the height of the opening between the main movable blade and the support blade is not increased without increasing the stroke width of the movable type and without increasing the cycle time. An object of the present invention is to provide a press molding apparatus capable of increasing the thickness.

The present invention is a press molding apparatus used when molding a workpiece into a molded product,
A support blade for supporting the workpiece; a main movable blade for processing the workpiece supported by the support blade; and a cam driver that holds the main movable blade and is fixed to a movable mold that moves up and down. A passive cam for moving the support blade up and down,
The cam driver has a driver sliding portion that moves the passive cam in a substantially horizontal direction by sliding with a first cam sliding portion formed on the passive cam when descending,
The passive cam has a second cam sliding portion for moving the supporting blade up and down by sliding with a supporting sliding portion formed on the supporting blade during advance and retreat, and the passive cam is mounted on the cam driver. The press molding apparatus is characterized by comprising an urging means for urging in a direction opposite to the moving direction accompanying the lowering (Claim 1).

The effects of the present invention will be described together with the operation of the press molding apparatus.
In the present invention, the cam driver is fixed to a movable type that holds the main movable blade and moves up and down. The cam driver has a driver sliding portion that moves the passive cam in a substantially horizontal direction by sliding with the first cam sliding portion. Furthermore, the passive cam has a second cam sliding portion that raises and lowers the bearing blade by sliding with the bearing sliding portion.
With this configuration, it is possible to obtain a press molding apparatus that can increase the opening height between the main movable blade and the support blade without increasing the stroke width of the movable mold and without increasing the cycle time. Can do.

That is, when the movable mold is lowered, the cam driver is lowered together with the movable mold. When the cam driver is lowered, the first cam sliding portion of the passive cam and the driver sliding portion of the cam driver slide. Thereby, the passive cam can be moved in a substantially horizontal direction. Thereby, the support sliding part of a support blade and the 2nd cam sliding part of a cam driver can slide, and a support blade can be raised.
On the other hand, when the movable die is further lowered, the main movable blade that is lowered together with the cam driver comes into contact with the workpiece.
Thereafter, the workpiece is formed by press molding between the main movable blade and the support blade.

  In the present invention, after that, the movable die is raised to raise the cam driver and the main movable blade. Then, the passive cam is moved by the biasing force of the biasing means while sliding the bearing sliding portion and the second cam sliding portion. Thereby, a support blade can be lowered | hung and a clearance gap can be formed between the lower end of a main movable blade and the upper end of a support blade. Then, the workpiece can be removed from the gap.

That is, not only the main movable blade and the support blade are closed, but also the main movable blade is raised, and the support blade is lowered so that the support blade can be moved without increasing the amount of upward movement of the main movable blade. By lowering, the opening height between the lower end of the main movable blade and the upper end of the support blade can be increased. Therefore, it is possible to obtain a press molding apparatus that can increase the opening height between the main movable blade and the support blade without increasing the stroke width.
Moreover, since it is not necessary to increase the stroke width of the movable mold as described above, the cycle time for forming the workpiece does not increase.

  In other words, the movable stroke width can be reduced and the cycle time can be shortened without reducing the opening height. That is, the vertical movement of the main movable blade, that is, the movable type can be reduced by the amount that the support blade moves up and down as described above. Thereby, the stroke width of the press molding apparatus can be reduced without reducing the opening height, and the cycle time can be shortened.

  As described above, according to the present invention, the opening height between the main movable blade and the support blade can be increased without increasing the movable stroke width and without increasing the cycle time. A press molding apparatus can be provided.

In the present invention (Claim 1), the press forming apparatus can be used for press forming a steel plate or the like used for a body of an automobile, for example.
As the urging means, for example, various elastic bodies such as a spring, compressed gas, hydraulic pressure, or the like can be used.
In the movable mold, the main movable blade and the cam driver can be integrally formed by a single member, or can be integrated after they are separately manufactured.

  Further, the press molding apparatus of the present invention can be used for a general single-acting apparatus, and also for an apparatus for molding a molded product by a so-called progressive feeding process. The progressive feeding process includes a plurality of different types of molds corresponding to a plurality of molding processes, and a press molding apparatus that drives all the above molds synchronously by a single stroke. A process in which a workpiece is simultaneously press-molded and sequentially moved to the next mold.

The Example which concerns on the press molding apparatus of this invention is described using FIGS.
The press molding apparatus 1 of this example is used when the workpiece 50 is molded into a molded product (see reference numeral 5 in FIGS. 6E and 7) as shown in FIG.

  As shown in FIGS. 1 to 5, the press forming apparatus 1 includes a support blade 21 that supports the workpiece 50, and a main movable blade 31 that processes the workpiece 50 supported by the support blade 21. And a cam driver 32 fixed to a movable mold 30 that holds the main movable blade 31 and moves up and down, and a passive cam 33 that moves the support blade 21 up and down.

The cam driver 32 has a driver sliding portion 321 that moves the passive cam 33 in a substantially horizontal direction by sliding with the first cam sliding portion 331 formed on the passive cam 33 when descending.
The passive cam 33 has a second cam sliding portion 332 that moves up and down the supporting blade 21 by sliding with a supporting sliding portion 212 formed on the supporting blade 21.
Further, the passive cam 33 has a biasing means 330 that biases the passive cam 33 in a direction (see an arrow Z in FIG. 2) opposite to a moving direction (see an arrow Y in FIG. 2) when the cam driver 32 is lowered. .

Details will be described below.
In the following, for convenience of explanation, the upper side in FIG. 1 is referred to as the upper side, and the left side of the paper is referred to as the left side.
Further, in the passive cam 33, forward means moving to the right in the drawing in FIG. 1, and backward means moving to the left in the drawing in FIG.
The press forming apparatus 1 of this example can be used when, for example, a steel plate used for a body of an automobile is press formed by a so-called progressive process.

  Moreover, as shown in FIG. 7, the press molding apparatus 1 has a plurality of different types of molds 10 (10a to 10e), and simultaneously drives all the molds 10 by a single stroke. The workpiece 50 in the step can be press-molded at the same time.

When the workpiece 50 is press-molded by the progressive feeding process as in this example, there are the following advantages. That is, for example, it is assumed that there are 100 workpieces 50 that need to go through 10 steps to become a molded product 5.
Here, in the case of adopting a so-called tandem molding process that performs press molding of a certain process by a single stroke, the number of molds 10 is required for the number of processes, so the number of strokes is A total of 1000 times (= 100 × 10 times) is required.

On the other hand, according to the above-described progressive process, the number of strokes until all the workpieces 50 become the molded products 5 is 109 times in the above example.
Therefore, if the press molding apparatus 1 of this example is used in the progressive feeding process, the number of man-hours can be greatly reduced, and the cycle time can be greatly reduced.

As will be described later, the workpiece 50 is formed into a final product 5 as a final product through a process using a mold 10 having various shapes.
As shown in FIG. 7, the press molding apparatus 1 of this example includes five molding dies 10, that is, molding dies 10 a and 10 b respectively used in an end cutting process, a bending process, a molding process, a hole punching process, and a separation process described later. 10c, 10d, and 10e are juxtaposed.

  Among these, the molds 10c, 10d, and 10e have a configuration that is a characteristic part of the present invention described above. Therefore, as shown in FIG. 7, the molds 10 c, 10 d, and 10 e include a passive cam 33 for moving the support blade 21 up and down. Although not shown, these also have a cam driver 32.

Below, the structure of the shaping | molding die 10c in a shaping | molding process is demonstrated in detail on behalf of these.
As shown in FIG. 1, the support blade 21 is disposed to support the workpiece 50 from below, and is fixed to a base portion 390 formed on a fixed mold 39 arranged below the workpiece 50. .

The movable mold 30 holds a cam driver 32 and a main movable blade 31.
The main movable blade 31 is disposed so as to face the workpiece 50 in the base portion 300 provided in the movable mold 30.
In addition, the main movable blade 31 has a pad 311 connected to the base portion 300 by an elastic body 310 on the inner side.

The cam driver 32 has a columnar driver support portion 324 formed downward from the base portion 300 of the movable mold 30.
The cam driver 32 has a driver sliding portion 321 inclined toward the main movable blade 31 toward the upper side at the lower end of the surface on the main movable blade 31 side, and further vertically from the upper end portion of the driver sliding portion 321. And a driver flat portion 323 extending upward.

The passive cam 33 is disposed below the support blade 21 in the press molding apparatus 1.
The passive cam 33 is adjacent to the left side of the pair of second cam sliding portions 332 and the pair of second cam sliding portions 332 which are inclined downward on the upper surface toward the right. A pair of cam contact surfaces 334 formed in the left-right direction, a cam slope portion 336 that goes upward as it goes to the right, a right end portion of the left second cam sliding portion 332, and a left end portion of the cam slope portion 336 And a cam flat surface portion 337 formed in the left-right direction.

The passive cam 33 has a convex portion 335 that is formed by a cam slope portion 336, a right cam contact surface 334, and a right second cam sliding portion 332 and protrudes upward.
Further, as shown in FIGS. 1 to 3, the passive cam 33 is urged to the left by the urging means 330.
As the biasing means 330, for example, an elastic body of a spring member, compressed gas, hydraulic pressure, or the like can be used.

The support blade 21 is adjacent to the pair of support slide portions 212 on the lower surface and slides with the pair of second cam slide portions 332 on the right side, and the passive cam 33 is most advanced. In FIG. 3 and FIG. 5, a pair of support contact surfaces 214 that contact the pair of cam contact surfaces 334, and a support slope that goes upward from the right end of the left support contact surface 214 toward the right. Part 216 and a support plane part 217 formed in the left-right direction between the left end part of the right side support sliding part 212 and the right end part of the support slope part 216.
The support blade 21 has a recess 215 that is formed by a support slope portion 216, a support flat surface portion 217, and a right support slide portion 212 and that is recessed upward.

Next, an example of operation | movement of the press molding apparatus 1 of this example is demonstrated using Fig.6 (a)-(e) and FIG.
As described above, the workpiece 50 is molded into the molded product 5 by the progressive feeding process. That is, the molded product 5 is obtained by sequentially feeding the workpiece 50 to the following cutting process, bending process, molding process, hole punching process, and separation process.

  First, as shown in FIGS. 6A and 7, the workpiece 50 is formed by extending the roll 500 and converting it into a workpiece 50a having a predetermined length by the forming die 10a in the first cutting process. Disconnect. At this time, feed bars are formed at both ends of each workpiece 50a in the conveying direction to partially connect adjacent workpieces 50 and to convey workpiece 50 integrally to the next step. ing. That is, in the end cutting process, the workpiece 50 is cut so as to leave the feed bar.

Next, in the bending process, the workpiece 50a is press-molded by a bending mold 10b as shown in FIG. 6B and FIG. The workpiece 50b is formed.
Next, in the molding step, the workpiece 50b is press-molded by a molding die 10c as shown in FIGS. 6C and 7, and the side surface of the workpiece 50b shown in FIGS. A workpiece 50c having a small opening is formed. The workpiece 50 c has the same height as the final molded product 5.

Next, in the hole punching step, the workpiece 50c is press-molded with a molding die 10d as shown in FIGS. 6D and 7 to be a workpiece 50d having a through hole 51 on its upper surface.
Next, in the separation step, the workpiece 50d is separated from the feed bars formed at both ends and the workpiece 50d by a molding die 10e as shown in FIGS. Form.
The workpiece 50 is molded into the molded product 5 by the procedure as described above.

Below, especially the case where it press-molds with the shaping | molding die 10 shown in FIG.6 (c) among the said processes is demonstrated in detail.
When the press molding by the bending process shown in FIGS. 6B and 7 is finished, the workpiece 50b is next placed on the support blade 21 of the molding die 10 in the molding process shown in FIG. 6C. It is conveyed to the process. The workpiece 50b is supported by the support blade 21 shown in FIGS.
Next, as shown in FIGS. 1 and 4, the cam driver 32 is moved downward (see arrow X in FIGS. 1 and 4).

Next, as shown in FIG. 2, the driver sliding portion 321 and the first cam sliding portion 331 slide, and the passive cam 33 is pushed by the cam driver 32. Thereby, the passive cam 33 moves forward, that is, toward the arrow Y in FIG.
Next, while moving the cam driver 32 further downward (see arrow X in FIG. 2), as shown in FIGS. 3 and 5, the driver flat portion 323 and the cam flat portion 333 are slid.

That is, at this time, the passive cam 33 is stationary without moving in the left-right direction on the paper surface of FIG.
A pair of cam contact surfaces 334 formed on the upper surface of the passive cam 33 is in contact with a pair of support contact surfaces 214 formed on the lower surface of the support blade 21.

  Further, at this time, the support blade 21 is raised by a distance from the cam flat surface portion 337 to the cam contact surface 334 (see symbol d in FIG. 5) from the state in FIGS. Specifically, the distance d can be set to 20 mm, for example. That is, the support blade 21 rises not only with respect to the passive cam 33 but also with respect to the fixed die 39 by 20 mm.

Then, as the cam driver 32 further descends, the main movable blade 31 that moves together with the cam driver 32 after the pad 311 comes into contact with the upper surface of the workpiece 50 as shown in FIGS. Abut.
Next, the workpiece 50 is press-formed between the main movable blade 31 and the support blade 21.

At this point, the cam driver 32 has moved to the lowest position, and as shown in FIGS. 3 and 5, the cam driver 32 stops with the driver flat portion 323 and the cam flat portion 333 contacting each other. Yes.
That is, the cam driver 32 has reached the bottom dead center at this time, and does not move further downward.

  Next, the movable mold 30 is pulled upward in order to release the workpiece 50 from the press molding apparatus 1. At this time, the main movable blade 31 and the cam driver 32 are raised according to the movable mold 30, and the driver flat portion 323 and the cam flat portion 333 slide.

When the movable mold 30 is further raised, the passive cam 33 urged to the left by the urging means 330 moves backward while sliding the first cam sliding portion 331 on the driver sliding portion 321. Thereby, since the main movable blade 31 rises and the support blade 21 descends, a sufficiently large opening height H is formed between them.
Next, as shown in FIGS. 1, 2, and 5, the workpiece 50 is conveyed to the support blade 21 of the molding die 10 in the next process by passing between the main movable blade 31 and the support blade 21. To do.
With the above procedure, the molding process shown in FIG.

Below, the effect of this example is demonstrated.
In this example, the cam driver 32 is fixed to a movable mold 30 that holds the main movable blade 31 and moves up and down. The cam driver 32 has a driver sliding portion 321 that moves the passive cam 33 in a substantially horizontal direction by sliding with the first cam sliding portion 331 when descending. Further, the passive cam 33 has a second cam sliding portion 332 that moves the support blade 21 up and down by sliding with the support sliding portion 212 during advance and retreat.
With this configuration, the opening height between the main movable blade 31 and the support blade 21 (see symbol H in FIG. 4) is increased without increasing the stroke width of the movable mold 30 and without increasing the cycle time. The press molding apparatus 1 that can be obtained can be obtained.

That is, since the main movable blade 31 and the support blade 21 are closed, the main movable blade 31 is not only raised but also the support blade 21 is lowered, so that the amount of upward movement of the main movable blade 31 is not increased. The opening height H between the lower end of the main movable blade 31 and the upper end of the support blade 21 can be increased by lowering the support blade 21. Therefore, it is possible to obtain a press molding apparatus that can increase the opening height H between the main movable blade 31 and the support blade 21 without increasing the stroke width.
Moreover, since it is not necessary to increase the stroke width of the movable mold as described above, the cycle time for molding the workpiece does not increase.

  As described above, according to this example, the opening height between the main movable blade and the support blade can be increased without increasing the movable stroke width and without increasing the cycle time. A press molding apparatus can be provided.

Explanatory drawing of the press molding apparatus which shows the state before press molding in an Example. Explanatory drawing of the press molding apparatus which shows the state in which the main movable blade is approaching the support blade in an Example. Explanatory drawing of the press molding apparatus which shows the state currently press-molding in an Example. Explanatory drawing which shows the state before performing press molding in an Example. Explanatory drawing which shows the state after press-molding in an Example. In an Example, (a) Explanatory drawing which shows the state which has cut | disconnected the roll, (b) Explanatory drawing which shows the state which press-molded the workpiece, (c) Explanation which shows the state which further pressed the workpiece FIG. 4D is an explanatory diagram illustrating a state in which a through hole is provided on the upper surface of the workpiece, and FIG. 5E is an explanatory diagram illustrating a state in which the workpiece is separated into molded products. Explanatory drawing of the press molding apparatus in an Example. Explanatory drawing which shows the state before press molding in a prior art example. Explanatory drawing which shows the state after press-molding in a prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Press molding apparatus 21 Bearing blade 212 Bearing sliding part 30 Movable type 31 Main movable blade 32 Cam driver 321 Driver sliding part 33 Passive cam 330 Energizing means 331 First cam sliding part 332 Second cam sliding part 4 Cam Mechanism 50 Workpiece

Claims (1)

A press molding apparatus used when molding a workpiece into a molded product,
A support blade for supporting the workpiece; a main movable blade for processing the workpiece supported by the support blade; and a cam driver that holds the main movable blade and is fixed to a movable mold that moves up and down. A passive cam for moving the support blade up and down,
The cam driver has a driver sliding portion that moves the passive cam in a substantially horizontal direction by sliding with a first cam sliding portion formed on the passive cam when descending,
The passive cam has a second cam sliding portion for moving the supporting blade up and down by sliding with a supporting sliding portion formed on the supporting blade during advance and retreat, and the passive cam is mounted on the cam driver. A press molding apparatus comprising biasing means for biasing in a direction opposite to the moving direction accompanying the lowering.

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