JP2006035289A - Press-forming apparatus and cushion ring - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a high-rigidity cushion ring which prevents the deformation of a wrinkle suppressing surface caused by deflection in the lower part of the cushion ring in the direction in which the ring is outward expanded by inward force added to the upper part of the cushion ring at forming work. <P>SOLUTION: This press forming apparatus 1 is provided with a die 2, a punch 3 and the cushion ring 5. The cushion ring has a rib 51 which is reinforcing structure for preventing the deflection at the time of press forming and recessed parts 31 which are relief parts of the reinforcing structural material for preventing the contact of the punch with the rib of the cushion ring are formed. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a press molding apparatus including a die, a punch, and a cushion ring, and a cushion ring, and more particularly to a configuration for preventing the cushion ring from bending.

Conventionally, it is a press forming apparatus that performs a die forming process, including a die, a punch, and a cushion ring, and the work is placed opposite to the die while the work is sandwiched between the die and the cushion ring during the forming process. 2. Description of the Related Art A press molding apparatus that performs a molding process by pressing against a punch is known. For example, an apparatus described in Patent Document 1.
As shown in FIGS. 15 and 16, such a press molding apparatus includes a die 102 serving as an upper die, a punch 103 disposed to face the die 102, and a lower die configured integrally with the punch 103. 104 and a cushion ring 105 that is an annular member disposed around the punch 103.
Then, at the time of molding with the die 102 lowered, the wrinkle pressing surface 102a of the die 102 and the wrinkle pressing surface 105a of the cushion ring 105 sandwich the work W interposed between the die 102 and the punch 103. Thus, wrinkles and cracks are prevented from occurring in the workpiece W after processing.
JP 2002-86219 A

At the time of molding by the above-described press molding apparatus, the die 102 is lowered, and after the work W is sandwiched between the wrinkle pressing surface 102a of the die 102 and the wrinkle pressing surface 105a of the cushion ring 105, the die 102 is further lowered. Then, the work W is pressed against the punch 103 and deformed to perform the forming process of the work W, and the work W is completely sandwiched between the punch 103 and the die 102 to complete the forming.
When the work W is pressed against the punch 103 for forming, a force is applied to the processed portion of the work W in the direction of moving inward, so the upper part of the cushion ring 105 sandwiching the peripheral edge of the work W is also placed on the inner side. Directional pull force acts.
Due to the inward force applied to the upper portion of the cushion ring 105, the rigidity of the annular cushion ring 105 is insufficient, and the lower portion of the cushion ring 105 is bent and deformed in the direction of spreading outward. If deformation occurs in the cushion ring 105 during the molding process, the contact between the wrinkle pressing surface 102a of the die 102 and the wrinkle pressing surface 105a of the cushion ring 105 becomes worse. As a result, there is a problem that the workpiece W cannot be sufficiently clamped and defects such as wrinkles and cracks are likely to occur in the workpiece W after processing.
In particular, when a large workpiece such as a side panel of an automobile is drawn, the rigidity of the cushion ring 105 tends to be insufficient, and the deformation of the cushion ring 105 becomes significant.
Further, in order to prevent the occurrence of wrinkles and cracks due to the bending of the cushion ring 105, operations such as cutting the wrinkle pressing surfaces 102a and 205a are necessary, which is complicated.

A press molding apparatus and a cushion ring that solve the above problems have the following characteristics.
That is, a press molding apparatus including a die, a punch, and a cushion ring according to claim 1, wherein the cushion ring has a reinforcing structure that prevents bending during press molding, and the punch includes a punch and a cushion. A reinforcing structural member escape portion is formed to prevent contact with the reinforcing structural member of the ring.
Thereby, the rigidity of a cushion ring can be improved and the bending and deformation | transformation of the cushion ring at the time of the shaping | molding process of a workpiece | work can be prevented.
Accordingly, it is possible to suppress the occurrence of wrinkles and cracks in the workpiece after the molding process without requiring a complicated adjustment operation, and to improve the molding process accuracy.
Further, since the rigidity of the cushion ring is improved, bending due to a processing force when machining the cushion ring can be suppressed, and the machining accuracy can be improved.
In addition, it is possible to configure the press molding apparatus as a whole compactly by configuring the lower mold of the work with only the punch while omitting the lower mold.

According to a second aspect of the present invention, the reinforcing structure is formed on a portion of the cushion ring opposite to the contact surface side portion with the die.
Thereby, the effect of bending prevention can be enlarged.

According to a third aspect of the present invention, the reinforcing structure of the cushion ring is a reinforcing rib that is installed in the opening of the cushion ring.
This eliminates the need for special materials and operations for providing the reinforcing material, and does not increase the cost of the press molding apparatus.

According to a fourth aspect of the present invention, the reinforcing structure of the cushion ring is a wire laid over the opening of the cushion ring.
Thereby, a reinforcing material can be made lightweight and it becomes possible to set tension (reinforcing force) comparatively easily. In addition, it is possible to adjust the degree of reinforcement of the cushion ring relatively easily by adjusting the tension of the wire.

According to a fifth aspect of the present invention, the reinforcing rib is integrally formed with the cushion ring or fastened to the cushion ring by a fastening member.
Thereby, a cushion ring can be reinforce | strengthened firmly and it becomes possible to suppress the bending of a cushion ring effectively.

According to a sixth aspect of the present invention, a tensile tension is applied to the wire, and the applied tensile tension can be adjusted.
This makes it possible to adjust to the optimum tension according to the magnitude of the inner force applied to the upper part of the cushion ring, effectively suppressing the deflection of the cushion ring and realizing high-precision molding. it can.

According to a seventh aspect of the present invention, a leg portion extending downward is formed at a lower end of the punch, an attachment hole for attaching a hook member is formed on a side surface of the punch, and the punch and the cushion ring are formed. Are installed on the same floor, the attachment hole is positioned above the cushion ring.
As a result, the punch and the cushion ring can be installed on the same floor surface, the hanging hook can be attached to the side surface of the punch, and the punch can be suspended and pulled out using the hook.

According to the eighth aspect of the present invention, in the press molding apparatus, a cushion pin is disposed below the cushion ring, and the cushion pin supports the body portion of the cushion ring and the reinforcing structural member.
Thereby, even when a force in the inner direction is applied to the upper portion of the cushion ring, it is possible to prevent the reinforcing structure material from being bent so as to be bent.

According to a ninth aspect of the present invention, there is provided a cushion ring provided in the press molding apparatus, which has a reinforcing structure for preventing bending during press molding.
Thereby, the rigidity of a cushion ring can be improved and the bending and deformation | transformation of the cushion ring at the time of the shaping | molding process of a workpiece | work can be prevented.
Accordingly, it is possible to suppress the occurrence of wrinkles and cracks in the workpiece after the molding process without requiring a complicated adjustment operation, and to improve the molding process accuracy.
Further, since the rigidity of the cushion ring is improved, bending due to a processing force when machining the cushion ring can be suppressed, and the machining accuracy can be improved.
In addition, it is possible to configure the press molding apparatus as a whole compactly by configuring the lower mold of the work with only the punch while omitting the lower mold.

According to a tenth aspect of the present invention, the reinforcing structure is formed on a portion of the cushion ring opposite to the contact surface side portion with the die.
Thereby, the effect of bending prevention can be enlarged.

Further, according to an eleventh aspect of the present invention, the reinforcing structure is a reinforcing rib provided on the opening of the cushion ring.
This eliminates the need for special materials and operations for providing the reinforcing material, and does not increase the cost of the press molding apparatus.

According to a twelfth aspect of the present invention, the reinforcing structure is a wire installed in the opening of the cushion ring.
Thereby, a reinforcing material can be made lightweight and it becomes possible to set tension (reinforcing force) comparatively easily. In addition, it is possible to adjust the degree of reinforcement of the cushion ring relatively easily by adjusting the tension of the wire.

The reinforcing rib may be integrally formed with the cushion ring or fastened to the cushion ring by a fastening member.
Thereby, a cushion ring can be reinforce | strengthened firmly and it becomes possible to suppress the bending of a cushion ring effectively.

Further, as described in claim 14, a tensile tension is applied to the wire, and the applied tensile tension can be adjusted.
This makes it possible to adjust to the optimum tension according to the magnitude of the inner force applied to the upper part of the cushion ring, effectively suppressing the deflection of the cushion ring and realizing high-precision molding. it can.

ADVANTAGE OF THE INVENTION According to this invention, the rigidity of a cushion ring can be improved and the bending and deformation | transformation of a cushion ring at the time of a shaping | molding process of a workpiece | work can be prevented.
Accordingly, it is possible to suppress the occurrence of wrinkles and cracks in the workpiece after the molding process without requiring a complicated adjustment operation, and to improve the molding process accuracy.
Further, since the rigidity of the cushion ring is improved, bending due to a processing force when machining the cushion ring can be suppressed, and the machining accuracy can be improved.
In addition, it is possible to configure the press molding apparatus as a whole compactly by configuring the lower mold of the work with only the punch while omitting the lower mold.

  Next, modes for carrying out the present invention will be described with reference to the accompanying drawings.

A press molding apparatus 1 shown in FIGS. 1 and 2 performs drawing, and includes a die 2 as an upper die, a punch 3 disposed opposite to the die 2 (downward in FIG. 1), and a punch. 3 is provided with a cushion ring 5 which is an annular member disposed around the periphery of 3.
The die 2 is configured to be driven up and down, and the cushion ring 5 is configured to be able to follow the die 2 (that is, to move up and down following the up and down movement of the die 2).
The cushion ring 5 and the punch 3 are placed on the bolster 6.
Further, a wrinkle pressing surface 2a is formed on the outer peripheral portion of the lower surface of the die 2, and a wrinkle pressing surface 5a is formed on the upper surface of the cushion ring 5 at a position corresponding to the wrinkle pressing surface 2a of the die 2. 2a and the wrinkle pressing surface 5a are configured to be able to come into contact with each other.

A plate-like workpiece W, which is a workpiece, is interposed between the die 2 and the punch 3. When the workpiece W is molded by the press molding apparatus 1, first, the die 2 is lowered, The periphery of the workpiece W is sandwiched between the wrinkle pressing surface 2a of the die 2 and the wrinkle pressing surface 5a of the cushion ring 5 (state shown in FIG. 1).
Thereafter, the die 2 is further lowered, and the workpiece W is pressed against the machining surface 3a of the punch 3 to be deformed, thereby forming the workpiece W. As shown in FIG. 3, the machining surface 3a of the punch 3 and the die 2 Molding is completed by completely sandwiching the workpiece W with the processed surface 2b.
At this time, the cushion ring 5 moves down together with the die 2 while maintaining the state where the workpiece W is sandwiched.

A plurality of ribs 51 that act as reinforcing materials are installed on the inner surface of the lower portion of the opening 5 b of the cushion ring 5. The ribs 51 connect, for example, inner surfaces that are substantially opposed to each other at the lower portion of the opening 5b, and the ribs 51 are integrally connected at the intersection 51a.
The punch 3 is fitted into the opening 5 b of the cushion ring 5, and a recess 31 for avoiding interference with the rib 51 is formed at the lower part of the punch 3. The recess 31 is formed in accordance with the shape of the rib 51 formed in the cushion ring 5.

Here, when the workpiece W is pressed against the machining surface 3a of the punch 3 by the lowering of the die 2, a force is applied to the workpiece W in the direction of moving inward, so the peripheral portion of the workpiece W is A tensile force in the inner direction also acts on the upper part of the sandwiched cushion ring 5.
When a pulling force inwardly acts on the upper part of the cushion ring 5, if the reinforcing material is not provided like the cushion ring 105 shown in FIG. 15, the lower part of the cushion ring 105 will bend in the direction of spreading outward. In the cushion ring 5, the plurality of ribs 51 are installed under the opening 5b to suppress the occurrence of bending.

In this way, by providing the rib 51 as a reinforcing material in the opening 5b of the cushion ring 5, the rigidity of the cushion ring 5 can be improved, and the cushion ring 5 can be bent and deformed when the workpiece W is formed. Can be prevented. Thereby, wrinkles and cracks can be prevented from occurring in the workpiece W after the molding without requiring a complicated adjustment operation, and the molding accuracy can be improved.
Further, since the rigidity of the cushion ring 5 is improved, bending due to a processing force when the cushion ring 5 is machined can be suppressed, and machining accuracy can be improved.

In particular, since the rib 51 is installed in the lower part which is a part on the opposite side to the upper part of the cushion ring 5 to which the force to an inner side is applied, the effect of prevention of bending is great.
Further, the rib 51 serving as the reinforcing material of the cushion ring 5 can be integrally formed at the same time as the cushion ring 5 is cast, so that no special material or work for providing the reinforcing material is required, and press molding is performed. The cost of the device 1 is not increased.
In the conventional press molding apparatus shown in FIG. 15, the lower mold of the workpiece W is constituted by the punch 103 and the lower mold 104. However, in the present press molding apparatus 1, the lower mold is omitted and only the punch 3 is provided. Therefore, the press molding apparatus 1 can be configured compactly as a whole.

Further, the rib 51 as a reinforcing material provided on the cushion ring 5 is formed integrally with the cushion ring 5, but is configured separately from the cushion ring 51 as shown in FIG. It is also possible to construct the reinforcing bar 52 on the opening 5b.
Support portions 52 a protrude from both ends of the reinforcing rod 52, and the support portions 52 a are inserted into support holes 5 c formed in the lower part of the cushion ring 5. A screw is formed at the distal end portion of the support portion 52 a, and the distal end portion projects outside the cushion ring 5. The reinforcing rod 52 is installed in the opening 5b of the cushion ring 5 by fastening a fastening member such as a nut to the tip of the support portion 52a protruding outward.

In this way, by fastening the reinforcing rod 52 composed of a rigid body such as a metal member to the cushion ring 5 and installing it on the opening 5b, the location of the reinforcing material to be installed, the number of reinforcing materials to be installed, and the like can be changed. Can be performed relatively easily.
Further, by configuring the cushion ring 5 with a rigid body such as the rib 51 or the reinforcing rod 52, the cushion ring 5 can be strongly reinforced, and the deflection of the cushion ring 5 can be effectively suppressed. Is possible.

Furthermore, the reinforcing material provided in the opening 5b of the cushion ring 5 can be constituted by a wire 53 installed in the opening 5b as shown in FIG.
For example, both ends 53a of the wire 53 are fixed to the upper part of the cushion ring 5, and are wound around a roller 5d provided in the cushion ring 5, and are stretched under the opening 5b.

In this way, the cushion ring 5 can be reinforced to prevent bending by stretching the wire 53 on the opening 5b.
Then, by using the stretched wire 53 as a reinforcing material, the reinforcing material can be reduced in weight, and the tension (reinforcing force) can be set relatively easily. In addition, the reinforcement degree of the cushion ring 5 can be adjusted relatively easily by adjusting the tension of the wire 53.

For example, as shown in FIG. 6, the tension is adjusted when the reinforcing member is formed of the wire 53, and the protrusion 54 protrudes from below the cushion ring 5 to contact the wire 53, and the contact degree is controlled. Thus, the tension of the wire 53 can be adjusted.
With this configuration, the tension of the wire 53 can be actively adjusted, and the tension can be adjusted to the optimum according to the magnitude of the force in the inner direction applied to the upper part of the cushion ring 5. The bending of the cushion ring 5 can be effectively suppressed, and a highly accurate molding process can be realized.

Further, in the conventional press molding apparatus, the cushion ring is fitted from above the punch 103 arranged below, but as shown in FIG. If the cushion ring 5 according to the present invention is to be fitted from above the punch 103, the punch 103 and the rib 51 cannot interfere with each other.
Therefore, as shown in FIG. 8, in the press molding apparatus 1, interference with the rib 51 is avoided when the cushion ring 51 is fitted to the punch 3 in a portion corresponding to the formation position of the rib 51 in the lower portion of the punch 3. The groove 31 is formed and the punch 3 is pulled out from the cushion ring 5.

Thus, when the punch 3 is pulled upward, it is necessary to attach a hanging hook to the punch 3 and hang the punch 3 by hanging a hanging wire or the like on the hook. This hanging hook is inserted into or screwed into a hook mounting hole formed in the punch 3, and this hanging hole is formed on the processing surface 3 a of the punch 3 that determines the processing shape of the workpiece W. It is necessary to form it on the side surface of the punch 3.
However, as shown in FIG. 9, since the hook mounting hole 3g formed on the side surface 3b of the punch 3 is covered with the cushion ring 5, the hook is inserted into the hook mounting hole 3g as it is. Can not do it.
Therefore, in the press molding apparatus 1, the leg portion 3 c extending downward from the lower end of the punch 3 is formed, and the hanging hook 3 d can be attached to the side surface 3 b of the punch 3.

That is, the leg storage hole 6a is formed in the bolster 6 arranged below the punch 3, and the leg 3c of the punch 3 is stored in the leg storage hole 6a at the normal time when the workpiece W is formed. Only the processing surface 3a protrudes above the cushion ring 5, and the periphery of the side surface 3b is covered with the cushion ring 5.
Then, when performing setup work or the like, the punch 3 is suspended together with the cushion ring 5 and carried to another place and placed on a flat floor surface 7. When carrying the punch 3 and the cushion ring 5, the punch 3 is suspended using a hook 5 e attached to the outer periphery of the cushion ring 5.

As shown in FIG. 10, when the punch 3 and the cushion ring 5 are placed on the floor surface 7, the punch 3 rises with respect to the cushion ring 5 by the height of the leg portion 3 c, thereby forming a hook attachment hole 3 g. The side surface 3 b of the punch 3 is positioned above the cushion ring 5.
By setting the side surface 3b above the cushion ring 5, it is possible to attach the hanging hook 3d to the side surface 3b of the punch 3 and suspend the punch 3 using the hook 3d and pull it out. .

In the press molding apparatus 1, a large number of cushion pins 8 urged upward are arranged below the cushion ring 5 to support the cushion ring 5, but the cushion ring 5 with the ribs 51 formed therein is supported. In this case, it is possible to support not only the main body portion of the cushion ring 5 but also the portion of the rib 51 that is a reinforcing structural member by the cushion pin 8.
As shown in FIG. 12, when an inner force is applied to the upper part of the cushion ring 5, the rib 51 may be bent so as to be bent. By supporting the portion and the rib 51 from below, it is possible to suppress such bending.

Further, as shown in FIG. 13, on the side surface of the punch 3, a tapping machine 9 performs tapping so that a slide seat 3 e that allows the cushion ring 5 to slide on the punch 3 is fastened by a fastening member such as a screw. It is necessary to apply.
Unlike the conventional press molding apparatus in which the lower mold 104 exists around the punch 103 in the press molding apparatus 1, there is no lower mold around the punch 3. Therefore, the tapping operation can be performed easily and quickly without causing the tapping machine 9 to interfere with the tapping machine 9.

  Further, in the press forming apparatus 1, the conventional lower die 104 is omitted and the independent punch 3 is configured and the punch 3 is pulled out upward. Therefore, as shown in FIG. The thickness dimension d and the height dimension h can be made large, and the cushion ring 5 itself can be made highly rigid.

It is side surface sectional drawing which shows the press molding apparatus concerning this invention. It is a top view which shows the cushion ring with which a press molding apparatus is equipped. It is side surface sectional drawing which shows a mode that the shaping | molding process is performed by inserting | pinching a workpiece | work completely with the process surface of a punch, and the process surface of die | dye. It is side surface sectional drawing which shows the 2nd Example of the reinforcing material of a cushion ring. It is side surface sectional drawing which shows the 3rd Example of the reinforcing material of a cushion ring. It is side surface sectional drawing which shows the example which enabled control of the tension | tensile_strength of the wire which is a reinforcing material shown in FIG. It is side surface sectional drawing which shows that the cushion ring concerning this invention cannot be fitted from upper direction in the structure of the conventional punch and lower mold | type. It is side surface sectional drawing which shows the structure which enabled pulling out upward with respect to the cushion ring. It is side surface sectional drawing which shows the state at the time of the shaping | molding process of the punch which provided the leg part. It is side surface sectional drawing which shows the state at the time of the setup operation | work of the punch which provided the leg part. It is side surface sectional drawing which shows a mode that the rib of a cushion ring is supported by the cushion pin. It is side surface sectional drawing which shows a mode that a rib bends with the force of the inner side direction concerning the upper part of a cushion ring. It is a side view which shows the mode of the tap hole for slide seat attachment with respect to the punch by a tap processing machine. It is side surface sectional drawing which shows a dimension by the thickness dimension and height of a cushion ring. It is side surface sectional drawing which shows the conventional press molding apparatus. It is a top view which shows the conventional cushion ring.

Explanation of symbols

W Work 1 Press molding device 2 Die 3 Punch 5 Cushion ring 31 Recess 51 Rib

Claims (14)

A press molding apparatus comprising a die, a punch, and a cushion ring,
The cushion ring has a reinforcing structure that prevents bending during press molding, and the punch is formed with a reinforcing structure material relief that prevents the punch and the reinforcing structure material of the cushion ring from contacting each other. A press forming apparatus.   2. The press molding apparatus according to claim 1, wherein the reinforcing structure is configured in a portion of the cushion ring opposite to a contact surface side portion with the die.   The press-molding apparatus according to claim 1 or 2, wherein the reinforcing structure of the cushion ring is a reinforcing rib provided in an opening of the cushion ring.   The press molding apparatus according to claim 1 or 2, wherein the reinforcing structure of the cushion ring is a wire constructed in an opening of the cushion ring.   4. The press molding apparatus according to claim 3, wherein the reinforcing rib is integrally formed with the cushion ring or is fastened to the cushion ring by a fastening member.   The press forming apparatus according to claim 4, wherein a tensile tension is applied to the wire, and the applied tensile tension is adjustable. A leg portion extending downward is formed at the lower end of the punch, and an attachment hole for attaching a hook member is formed on a side surface of the punch,
The press molding apparatus according to any one of claims 1 to 6, wherein when the punch and the cushion ring are installed on the same floor surface, the attachment hole is positioned above the cushion ring.   In the press molding apparatus, a cushion pin is disposed below the cushion ring, and the cushion pin supports a body portion of the cushion ring and a reinforcing structural member. The press molding apparatus in any one.   A cushion ring provided in a press molding apparatus, comprising a reinforcing structure for preventing bending during press molding.   The cushion ring according to claim 9, wherein the reinforcing structure is formed on a portion of the cushion ring opposite to the portion on the contact surface side with the die.   The cushion ring according to claim 9 or 10, wherein the reinforcing structure is a reinforcing rib erected on an opening of the cushion ring.   The cushion ring according to claim 9 or 10, wherein the reinforcing structure is a wire constructed in an opening of the cushion ring.   The cushion ring according to claim 11, wherein the reinforcing rib is integrally formed with the cushion ring or fastened to the cushion ring by a fastening member.   The cushion ring according to claim 12, wherein a tensile tension is applied to the wire, and the applied tensile tension is adjustable.

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