CN113543904A - Press device and press method - Google Patents

Abstract

A press device for molding a plate material by a die having an upper die and an upper movable die provided to be movable forward and backward relative to the upper die, the press device comprising: a pair of upper fixing plates which are driven by a driving unit to lift the upper die relative to the plate material and are arranged to be separated from each other in a pressing direction in which the die presses the plate material; and an upper movable plate that is pressed in the pressing direction so as to change a pressing force of the upper movable die against the plate material when pressed by the upper fixed plates, and is provided so as to be displaceable relative to the upper fixed plates in the pressing direction between the pair of upper fixed plates, wherein the plurality of upper movable plates are provided and are arranged to be stacked in the pressing direction between the pair of upper fixed plates.

Description

Press device and press method

Technical Field

The present invention relates to a press apparatus and a press method.

Background

JP4611205B discloses a press forming apparatus that performs secondary forming of trimming (trim), piercing (pierce), deburring, bending (bend), or coining (coining) of a plate material while performing shape forming of the plate material by drawing (drawing) by a single press operation.

Disclosure of Invention

However, in the press forming apparatus of JP4611205B, the dies are sequentially processed in the lifting and lowering process of the press to perform the secondary forming while performing the shape forming of the plate material. Therefore, the structure of the mold becomes complicated.

The purpose of the present invention is to perform multiple forming operations in a single press operation without using a die having a complicated structure.

According to one aspect of the present invention, a press apparatus for forming a sheet material by a die having an upper die and an upper movable die provided to be movable forward and backward relative to the upper die, includes: a pair of upper fixing plates which are driven by a driving unit to lift the upper die relative to the plate material and are arranged to be separated from each other in a pressing direction in which the die presses the plate material; and an upper movable plate that is pressed in the pressing direction so as to change a pressing force on the upper movable die of the plate material when pressed by the upper fixed plates, and is provided so as to be displaceable relative to the upper fixed plates in the pressing direction between the pair of upper fixed plates.

Further, according to an aspect of the present invention, a press method for molding a plate material by a die having an upper die and an upper movable die provided to be movable forward and backward with respect to the upper die, includes: pressing the upper die by an upper fixing plate moving in a pressing direction in which the die presses the plate material, thereby molding the plate material; and a step of pressing the upper movable mold so that the pressing force can be changed by the upper movable plate pressed by the upper fixed plate, thereby molding the plate material.

In the above aspect, the upper movable plate is provided so as to be displaceable relative to the upper stationary plate in the punching direction and to be pressed by the upper stationary plate. Further, when the upper movable plate is pressed by the upper fixed plate, the upper movable plate is pressed in the pressing direction so that the pressing force to the upper movable die of the plate material can be changed. Therefore, the molding can be performed a plurality of times by the upper mold of the mold provided in the upper fixed plate and the upper movable mold connected to the upper movable plate. Therefore, the upper fixed plate and the upper movable plate can be provided to perform molding a plurality of times, and thus it is not necessary to provide a complicated structure for the mold. Therefore, it is possible to perform a plurality of times of molding in one press operation without using a die having a complicated structure.

Drawings

Fig. 1 is a configuration diagram of a press apparatus according to a first embodiment of the present invention.

Fig. 2 is a diagram illustrating a first step in a pressing method using a pressing apparatus.

Fig. 3 is a diagram illustrating a second step in the pressing method using the pressing apparatus.

Fig. 4 is a diagram illustrating a third step in the pressing method using the pressing apparatus.

Fig. 5 is a diagram illustrating a fourth step in the pressing method using the pressing apparatus.

Fig. 6 is a structural diagram of a press apparatus according to a second embodiment of the present invention.

Fig. 7 is a diagram illustrating a first step in a pressing method using a pressing apparatus.

Fig. 8 is a diagram illustrating a second step in the pressing method using the pressing apparatus.

Fig. 9 is a diagram illustrating a third step in the pressing method using the pressing apparatus.

Fig. 10 is a diagram illustrating a fourth step in the pressing method using the pressing apparatus.

Fig. 11 is a diagram illustrating a fifth step in the pressing method using the pressing apparatus.

Fig. 12 is a diagram illustrating a sixth step in the pressing method using the pressing apparatus.

Fig. 13 is a diagram illustrating a seventh step in the pressing method using the pressing apparatus.

Fig. 14 is a diagram illustrating the sixth step and the seventh step in detail.

Fig. 15 is a structural diagram of a press apparatus according to a third embodiment of the present invention.

Fig. 16 is a diagram illustrating a first step in a pressing method using a pressing apparatus.

Fig. 17 is a diagram illustrating a second step in the pressing method using the pressing apparatus.

Fig. 18 is a diagram illustrating a third step in the pressing method using the pressing apparatus.

Fig. 19 is a diagram illustrating a fourth step in the pressing method using the pressing apparatus.

Fig. 20 is a diagram illustrating a fifth step in the pressing method using the pressing apparatus.

Detailed Description

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(first embodiment)

A press apparatus 100 according to a first embodiment of the present invention and a press method using the press apparatus 100 will be described below with reference to fig. 1 to 5.

First, the overall structure of the press apparatus 100 will be described with reference to fig. 1. Fig. 1 is a structural view of a press apparatus 100.

The press apparatus 100 is a servo press apparatus in which a slide (slide)1 driven by a servo motor (not shown) as a driving means is moved up and down. The press apparatus 100 presses the plate material 9 by the die 2. The press apparatus 100 includes a pair of upper fixed plates 10, a pair of upper movable plates 20 and 30, and a pair of upper rods (rod)25 and 35.

In each of the embodiments below, the moving direction (vertical direction in fig. 1) in which the die 2 presses the plate material 9 is referred to as a "pressing direction" or a "vertical direction".

First, the die 2 used by being attached to the press apparatus 100 will be described.

The mold 2 has an upper mold 4, a lower mold 5, and an upper movable mold 6. Here, the die 2 performs the drawing process, the piercing process, and the trimming process on the sheet material 9 in one pressing operation (one stroke).

The upper mold 4 is mounted to a lower portion of the lower upper fixing plate 10. The upper die 4 is disposed facing the upper side of the pressing direction with respect to the plate material 9. The upper die 4 has an edge trim portion 4 a. The upper movable die 6 is provided on the upper die 4 so as to be movable forward and backward with respect to the upper die 4 in the press direction.

The inner periphery of the blank mold portion 4a is formed in the same shape as the outer shape of the product to be molded. The blank mold portion 4a presses the outer periphery of the plate material 9 pressed by a pressing portion 6a to be described later to mold the outer shape of the product.

The lower die 5 is provided to face a lower side in the press direction so as to sandwich the plate material 9 with respect to the upper die 4. The lower mold 5 is attached to an upper portion of a lower fixing plate 42 supported by a base 41 to be described later. The lower die 5 includes a pressing portion 5a, a drawing die (die)5b, a pair of punching dies 5c, a trimming die 5d, and plate material supporting portions 5e and 5 f.

The pressing portion 5a holds the plate material 9 so as to sandwich the plate material 9 between the pressing portion and the pressing portion 6 a.

The drawing die 5b draws the sheet material 9 together with a drawing punch (punch)6b to be described later. At the time of drawing, a drawing punch (punch)6b enters the housing hole of the drawing die 5 b.

The punching die 5c performs punching of the sheet material 9 together with a punching punch 6c to be described later. During the piercing process, the piercing punch 6c enters the receiving hole of the piercing die 5 c.

The trimming die 5d trims the plate material 9 together with the trimming die portion 4 a. The trimming die 5d is formed in a block shape having the same outer shape as the shape of the product to be molded. At the time of trimming, the trimming die portion 4a enters the outer peripheral space of the trimming die 5 d.

The plate material support portion 5e supports the supplied plate material 9 from below. The plate material support portion 5e is biased upward by a spring 5 g. The plate material support portion 5e holds the plate material 9 so as to sandwich the plate material 9 between the plate material support portion and the plate material support portion 6 d.

Similarly, the work sheet support portion 5f supports the supplied work sheet 9 from below. The plate material support portion 5f is biased upward by a spring 5 h. The plate material support portion 5f holds the plate material 9 so as to sandwich the plate material 9 between the plate material support portion and the pressing portion 6 a.

The upper movable die 6 is set to be movable forward and backward with respect to the upper die 4, thereby molding the plate material 9. The upper movable die 6 has a pressing portion 6a, a drawing punch 6b, a pair of piercing punches 6c, and a plate material support portion 6 d.

The pressing portion 6a presses the upper surface of the plate material 9 when the plate material 9 is subjected to drawing, piercing, and trimming. The pressing portion 6a is formed in a block shape having the same outer shape as the shape of the product to be molded. The pressing portion 6a is pressed in a state of abutting against the upper lever 35 to mold the plate material 9.

The pressing portion 6a is biased downward by a spring 6 f. When the upper fixed plate 10 is moved down in the press direction by a predetermined stroke or more, the pressing portion 6a is pressed against the plate member 9 by the upper movable plate 30 via the upper rod 35. In this way, the pressing portion 6a can change the pressing force in two stages, that is, a state in which the spring 6f applies the pressing force and a state in which the upper movable plate 30 presses the pressing force.

Specifically, the pressing portion 6a is biased in the pressing direction by a spring 6f when the plate material 9 is subjected to the drawing process. On the other hand, the pressing portion 6a applies an urging force larger than that generated by the spring 6f in the press direction by the upper lever 35 when the plate material 9 is subjected to the punching process and the deburring process.

The drawing punch 6b is pressed against the plate 9 by the upper movable plate 20 via the upper rod 25. The drawing punch 6b is pressed in a state of abutting against the upper rod 25 to mold the sheet material 9. The sheet 9 is stretched by the stretching male die 6b together with the stretching female die 5 b.

The piercing punch 6c is attached to the lower portion of the lower upper retainer 10. The punching male die 6c performs punching processing on the plate 9 together with the punching female die 5 c.

The plate material support portion 6d supports the supplied plate material 9 from above. The plate material support portion 6d is biased downward by a spring 6 g. The plate material support portion 6d holds the plate material 9 so as to sandwich the plate material 9 between the plate material support portion and the plate material support portion 5 e.

Further, the upper die 4 is provided to be removable with respect to the upper fixing plate 10, and the lower die 5 is provided to be removable with respect to the lower fixing plate 42. Further, the upper rods 25, 35 and the upper movable die 6 abut against each other only when the plate material 9 is pressed. The mold 2 can be replaced in a state where the upper mold 4 is removed from the upper fixing plate 10, the lower mold 5 is simultaneously removed from the lower fixing plate 42, and the upper rods 25 and 35 are separated from the upper movable mold 6.

In this way, since all the structures for generating the machining force of the mold 2 are integrated in the holder 10A, there is no need to provide the mold 2 with a complicated structure, and the mold 2 can be downsized and modularized. Further, since the mold 2 is easily removed, the mold 2 can be easily replaced. Thus, for example, a mold that produces a relatively small number of parts can be easily manufactured.

Next, the press apparatus 100 will be explained.

The pair of upper fixing plates 10 are disposed apart from each other in parallel in the pressing direction. The upper fixing plate 10 is driven by a servo motor via the slider 1, and moves the upper die 4 up and down with respect to the plate 9.

The pair of upper fixing plates 10 are fixed to each other by a pair of vertical plates 11 provided in parallel spaced apart from each other in a direction perpendicular to the pressing direction. The pair of upper fixing plates 10 and the pair of vertical plates 11 form a rectangular holder 10A. The holder 10A is mounted on the lower portion of the slider 1. When the slider 1 driven by the servo electrode moves in the press direction, the holder 10A moves integrally with the slider 1.

Further, a guide 12 is provided between the pair of upper fixing plates 10. A guide 12 is provided in the press direction, and the guide 12 is inserted through the pair of upper movable plates 20 and 30.

The cylinders 23 and 33 are mounted on the lower surface of the upper fixed plate 10. The cylinders 23 and 33 move in the press direction together with the upper fixing plate 10. The lower upper fixing plate 10 has insertion holes through which the upper rods 25 and 35 are inserted, and guide holes 13 through which the guides 26 are inserted. A stopper 45 and a plate material support portion 46a are provided on the lower surface of the lower upper fixing plate 10.

The stopper 45 is opposed to the stopper 44 attached to the lower fixing plate 42. The stop block 45 defines a bottom dead center of the slider 1 when it abuts against the stop block 44.

The plate material supporting portion 46a faces the plate material supporting portion 46b attached to the lower fixing plate 42. The plate material support portion 46a supports the supplied plate material 9 from above. The plate material support portion 46a holds the plate material 9 so as to sandwich the plate material 9 between the plate material support portion 46b and the plate material support portion.

The upper movable plates 20 and 30 are provided in plural, and are arranged to be stacked between the pair of upper fixed plates 10, that is, in the retainer 10A, in the pressing direction. Here, the upper movable plates 20 and 30 are provided as a pair, but may be provided as three or more in accordance with the press operation performed by the press apparatus 100.

The upper movable plates 20, 30 are provided to be displaceable relative to the upper stationary plate 10 in the punching direction. The upper movable plates 20 and 30 are pressed by the upper fixed plate 10 from the middle of the movement of the upper fixed plate 10 in the press direction.

The upper movable plate 20 has a base plate 21, a lever holding plate 22, and a guide hole 24. When the retainer 10A is lowered in the pressing direction, the cylinder 23 abuts the upper movable plate 20. The upper movable plate 20 is pressed by the slider 1 via the air cylinder 23, thereby moving in the press direction. The upper movable plate 20 corresponds to a first upper movable plate, and the air cylinder 23 corresponds to a first air cylinder.

The base plate 21 is disposed in parallel with the upper fixing plate 10. The base plate 21 can move up and down while maintaining a state of being parallel to the upper fixing plate 10. The upper end of the upper rod 25 abuts against the lower surface of the base plate 21.

The lever holding plate 22 abuts against the lower surface of the base plate 21. The lever holding plate 22 holds the upper lever 25 and the guide 26 to be perpendicular with respect to the base plate 21. The area of the lever holding plate 22 in the horizontal direction orthogonal to the press direction is the same as that of the base plate 21, but may be smaller than the base plate 21 as long as the upper lever 25 can be held.

The guide hole 24 allows the upper movable plate 20 to move only in the pressing direction by the inserted guide 12.

The guide 26 is inserted through the upper movable plate 30 and the lower upper stationary plate 10. The guide 26 guides the movement of the upper movable plates 20 and 30 relative to the upper stationary plate 10 in the press direction.

The upper movable plate 30 is disposed to be stacked on the lower side of the upper movable plate 20. The upper movable plate 30 has a base plate 31, a lever holding plate 32, a guide hole 34, a through hole 36, and a through hole 37. When the retainer 10A is lowered in the pressing direction, the cylinder 33 abuts against the upper movable plate 30. The upper movable plate 30 is pressed by the slider 1 via the air cylinder 33, thereby moving in the press direction. The upper movable plate 30 corresponds to a second upper movable plate, and the cylinder 33 corresponds to a second cylinder.

When the upper movable plate 30 is pressed by the slider 1 via the holder 10A, the upper movable plate 30 presses the pressing portion 6a in the pressing direction so that the pressing force of the pressing portion 6a against the plate material 9 can be changed.

The base plate 31 is disposed in parallel with the upper fixing plate 10. The base plate 31 can move up and down while maintaining a state of being parallel to the upper fixing plate 10. The upper end of the upper rod 35 abuts against the lower surface of the base plate 31.

The lever holding plate 32 abuts against the lower surface of the base plate 31. The lever holding plate 32 holds the upper lever 35 to be perpendicular with respect to the base plate 31. The area of the lever holding plate 32 in the horizontal direction orthogonal to the pressing direction is the same as that of the base plate 31, but may be smaller than the base plate 31 as long as the upper lever 35 can be held.

When the air cylinder 23 presses the upper movable plate 20 to form the plate 9 by drawing the punch 6b, the air cylinder 33 and the upper movable plate 30 are separated from each other.

Thus, a time difference can be provided between the processing of the upper movable mold 6 pressed by the upper movable plate 20 and the processing of the upper movable mold 6 pressed by the upper movable plate 30. Therefore, the molding can be performed a plurality of times in sequence in one press operation.

The guide hole 34 allows the upper movable plate 30 to move only in the pressing direction by the inserted guide 12.

The upper rod 25 is inserted through the through hole 36. That is, the upper rod 25 connected to the upper movable plate 20 disposed above is disposed to penetrate the upper movable plate 30 disposed below. The guide 26 is inserted through the through hole 37.

The upper rods 25 and 35 are attached to arbitrary positions within the range of the pressing surfaces of the upper movable plates 20 and 30. The upper rods 25, 35 can change the mounting positions with respect to the upper movable plates 20, 30 according to the position of the upper movable mold 6.

Thus, the upper rods 25 and 35 can be arranged according to the position where the upper movable mold 6 is installed when the mold 2 is replaced.

The upper rod 25 is connected to the upper movable plate 20. The upper rod 25 is provided to be movable forward and backward with respect to the upper movable die 6, and presses the drawing punch 6b against the sheet material 9 in the press direction.

The upper rod 35 is connected to the upper movable plate 30. The upper lever 35 is provided to be movable forward and backward with respect to the upper movable die 6, and presses the pressing portion 6a toward the plate material 9 in the press direction.

As described above, the press apparatus 100 is provided with the upper movable plates 20 and 30 that are pressed by the upper stationary plate 10 and are displaceable relative to the upper stationary plate 10 in the press direction. When the upper movable plates 20 and 30 are pressed by the upper fixed plate 10, the upper movable plates 20 and 30 are pressed in the pressing direction so that the pressing force on the upper movable die 6 of the plate material 9 can be changed. Therefore, the upper mold 4 of the mold 2 provided in the upper fixed plate 10 and the upper movable mold 6 connected to the upper movable plates 20 and 30 can be used to perform molding a plurality of times. Therefore, since the upper fixed plate 10 and the upper movable plates 20 and 30 can be provided to perform molding a plurality of times, it is not necessary to provide the mold 2 with a complicated structure. Therefore, it is possible to perform a plurality of times of molding in one press operation without using a die having a complicated structure.

The press apparatus 100 includes a base 41 and a lower fixing plate 42.

The base 41 is formed in a flat plate shape and is provided on the floor surface. The base 41 supports the respective members constituting the press apparatus 100.

The lower fixing plate 42 is provided to be separated from the base 41 between the base 41 and the lower die 5. A stopper 44 and a plate material support portion 46a are provided on an upper surface of the lower fixing plate 42.

The stopper 44 is opposed to a stopper 45 attached to the upper fixing plate 10. The stop block 44 defines a bottom dead center of the slider 1 when it abuts against the stop block 45.

The plate material supporting portion 46b faces the plate material supporting portion 46a attached to the upper fixing plate 10. The plate material support portion 46b supports the supplied plate material 9 from below. The plate material support portion 46b is biased in the press direction by a spring 46 c. The plate material support portion 46b holds the plate material 9 so as to sandwich the plate material 9 between the plate material support portion 46a and the plate material support portion 46 b.

The base 41 and the lower fixing plate 42 are fixed to each other by a pair of vertical plates 43 provided in parallel separated from each other in a direction perpendicular to the press direction. The base 41, the lower fixing plate 42, and the pair of vertical plates 43 form a rectangular holder 40A.

Next, a pressing method using the pressing apparatus 100 will be described with reference to fig. 2 to 5. Fig. 2 to 5 are views for explaining first to fourth steps in a press method using the press apparatus 100, respectively.

As shown in fig. 2, when the slider 1 lowers the holder 10A in the pressing direction, the pressing portion 6a contacts the plate member 9, and in response thereto, presses the plate member 9 in the pressing direction to lower the plate member 9. Similarly, the plate material support portion 6d and the plate material support portion 46a contact the plate material 9, and in this way, press the plate material 9 in the press direction to lower the plate material 9. Then, the plate material 9 is held between the pressing portion 6a and the pressing portion 5a, between the plate material supporting portion 6d and the plate material supporting portion 5e, and between the plate material supporting portion 46a and the plate material supporting portion 46 b.

At this time, the plate material support portion 5e is pressed by the plate material support portion 6d and lowered to compress the spring 5 g. The plate material support portion 5f is pressed by the pressing portion 6a and lowered to compress the spring 5 h. The plate material support portion 46b is pressed by the plate material support portion 46a and is lowered to compress the spring 46 c. Thereby, the lower surface of the plate material 9 abuts against the pressing portion 5 a.

As shown in fig. 3, when the slider 1 further lowers the holder 10A in the pressing direction, the cylinder 23 comes into contact with the upper movable plate 20. The air cylinder 23 presses the upper movable plate 20 in the pressing direction. The pressing force generated by the air cylinder 23 is transmitted from the upper movable plate 20 to the drawing punch 6b through the upper rod 25. Thereby, the drawing punch 6b presses the sheet material 9 against the drawing die 5b to perform drawing.

At this time, the pressing portion 6a is biased by the spring 6f, and the force pressing the plate member 9 is in a small state suitable for the drawing process.

As shown in fig. 4, when the slider 1 further lowers the holder 10A in the pressing direction, the upper movable plate 30 is pressed upward by the upper rod 35 and raised, and contacts the cylinder 33. The air cylinder 33 presses the upper movable plate 30 in the pressing direction. The pressing force generated by the air cylinder 33 is transmitted from the upper movable plate 30 to the pressing portion 6a through the upper rod 35.

At the same time, the pair of piercing punches 6c attached to the lower portion of the lower anchor plate 10 enter the piercing die 5c to perform piercing processing for piercing the plate material 9.

At this time, the pressing portion 6a is pressed by the upper movable plate 30, and the force pressing the plate member 9 is set to a large state suitable for the punching process and the trimming process. That is, the pressing force of the pressing portion 6a against the plate material 9 changes.

As shown in fig. 5, when the slider 1 further lowers the holder 10A in the press direction, the trimming die portion 4a of the upper die 4 performs trimming between the trimming die portion and the trimming die 5d of the lower die 5 to cut the plate material 9.

At this time, similarly, the pressing portion 6a is pressed by the upper movable plate 30, and the force pressing the plate member 9 is set to a large state suitable for the punching process and the trimming process.

In this way, the sheet material 9 can be subjected to the drawing, piercing, and trimming in one pressing operation (one stroke) by changing the force with which the pressing portion 6a presses the sheet material 9 in the pressing operation. Therefore, it is possible to perform a plurality of times of molding in one press operation without using a die having a complicated structure.

According to the first embodiment described above, the following effects can be exhibited.

The press apparatus 100 for molding a plate material 9 by a die 2 having an upper die 4 and an upper movable die 6 provided to be movable forward and backward with respect to the upper die 4 includes: a pair of upper fixing plates 10 driven by a servo motor to move the upper die 4 up and down with respect to the plate 9, and disposed to be spaced apart from each other in a pressing direction in which the die 2 presses the plate 9; and upper movable plates 20 and 30 which are pressed in the pressing direction so that the pressing force on the upper movable mold 6 of the plate member 9 can be changed when pressed by the upper fixed plates 10, and which are provided so as to be displaceable relative to the upper fixed plates 10 in the pressing direction between the pair of upper fixed plates 10.

Further, a press method for molding a plate material 9 by a die 2 having an upper die 4 and an upper movable die 6 provided to be movable forward and backward with respect to the upper die 4 includes: a step of pressing the upper die 4 by pressing the upper fixing plate 10 moving in the pressing direction of the plate material 9 with the die 2, thereby molding the plate material 9; and a step of pressing the upper movable mold 6 so as to change the pressing force by the upper movable plates 20 and 30 pressed by the upper fixed plate 10, thereby molding the plate material 9.

In these configurations, the upper movable plates 20 and 30 are provided so as to be displaceable relative to the upper stationary plate 10 in the punching direction and to be pressed by the upper stationary plate 10. When the upper movable plates 20 and 30 are pressed by the upper fixed plate 10, the upper movable plates 20 and 30 are pressed in the pressing direction so that the pressing force on the upper movable die 6 of the plate material 9 can be changed. Therefore, the upper mold 4 of the mold 2 provided in the upper fixed plate 10 and the upper movable mold 6 connected to the upper movable plates 20 and 30 can be used to perform molding a plurality of times. Therefore, since the upper fixed plate 10 and the upper movable plates 20 and 30 can be provided to perform molding a plurality of times, it is not necessary to provide the mold 2 with a complicated structure. Therefore, it is possible to perform a plurality of times of molding in one press operation without using a die having a complicated structure.

The upper movable plates 20 and 30 are provided in plural, and are arranged to be stacked between the pair of upper fixed plates 10 in the press direction.

Further, upper rods 25 and 35 connected to the upper movable plates 20 and 30, provided to be movable forward and backward with respect to the upper movable die 6, and pressing the upper movable die 6 against the plate material 9 in the press direction are provided, and the upper rod 25 connected to the upper movable plate 20 disposed above is disposed so as to penetrate the upper movable plate 30 disposed below.

The upper rods 25 and 35 are attached to arbitrary positions within the range of the pressing surfaces of the upper movable plates 20 and 30, and the attachment positions to the upper movable plates 20 and 30 can be changed according to the position of the upper movable mold 6.

In these configurations, the mounting positions of the upper rods 25 and 35 connected to the upper movable plates 20 and 30 stacked in the pressing direction can be changed within the range of the pressing surfaces of the upper movable plates 20 and 30. Therefore, when the mold 2 is replaced, the upper rods 25 and 35 may be arranged corresponding to the position where the upper movable mold 6 is provided.

Further, the press apparatus 100 further includes: an air cylinder 23 which moves in the press direction together with the upper fixed plate 10 and presses the upper movable plate 20; and an air cylinder 33 which moves in the press direction together with the upper fixed plate 10 to press the upper movable plate 30, wherein the air cylinder 33 is separated from the upper movable plate 30 when the air cylinder 23 presses the upper movable plate 20 to mold the plate material 9 by the upper movable mold 6.

According to this configuration, a time difference can be provided between the processing performed by the upper movable mold 6 pressed by the upper movable plate 20 and the processing performed by the upper movable mold 6 pressed by the upper movable plate 30. Therefore, the molding can be performed a plurality of times in sequence in one press operation.

Further, the upper movable die 6 is pressed in a state of abutting against the upper rods 25, 35 to mold the plate material 9.

Further, the upper die 4 is provided to be removable from the upper fixed plate 10, the lower die 5 is provided to be removable from the lower fixed plate 42, and the die 2 can be replaced in a state where the upper die 4 is removed from the upper fixed plate 10, the lower die 5 is removed from the lower fixed plate 42, and the upper rods 25 and 35 are separated from the upper movable die 6.

According to these structures, the upper rods 25, 35 and the upper movable die 6 abut against each other only when the plate material 9 is pressed. Therefore, the mold 2 can be easily replaced by detaching the upper mold 4 and the lower mold 5 from the upper fixing plate 10 and the lower fixing plate 42, respectively, and separating the upper rods 25 and 35.

In this way, since all the structures for generating the machining force of the mold 2 are integrated in the holder 10A, there is no need to provide the mold 2 with a complicated structure, and the mold 2 can be downsized and modularized. Further, since the mold 2 is easily removed, the mold 2 can be easily replaced. Thus, for example, a mold that produces a relatively small number of parts can be easily manufactured.

(second embodiment)

A press apparatus 200 according to a second embodiment of the present invention and a press method using the press apparatus 200 will be described below with reference to fig. 6 to 14. In the following embodiments, the description will be given with a focus on points different from those of the first embodiment, and the same reference numerals are given to the structures having the same functions, and the description thereof will be omitted.

First, the overall structure of the press apparatus 200 will be described with reference to fig. 6. Fig. 6 is a structural view of the press apparatus 200.

The press apparatus 200 is a servo press apparatus in which the slide 1 is moved up and down by a servo motor (not shown) as a driving means. The press apparatus 200 presses the plate material 9 by the die 202. The press apparatus 200 includes a pair of upper fixed plates 10, an upper movable plate 20, an upper rod 25, a base 41, a lower fixed plate 42, and a lower movable plate 50.

First, the die 202 used by being attached to the press apparatus 200 will be described.

The mold 202 has an upper mold 204, a lower mold 205, an upper movable mold 206, and a lower movable mold 207. Here, the die 202 performs the first drawing process, the trimming process, the flanging (flanging) process, the piercing process, and the second drawing process on the plate material 9 in one press operation.

The upper mold 204 is mounted on the lower portion of the lower upper fixing plate 10. The upper die 204 is disposed to face the upper side of the pressing direction with respect to the plate material 9. The upper movable die 206 is provided on the upper die 204 so as to be movable forward and backward with respect to the upper die 204 in the press direction. The upper die 204 has a piercing punch 204c and a drawing punch 204 e.

The piercing punch 204c is mounted on the lower portion of the lower upper retainer 10. The piercing punch 204c performs piercing processing on the plate material 9 together with a piercing die 207c to be described later. A plurality of piercing punches 204c are provided side by side in the depth direction (the direction perpendicular to the paper plane).

The drawing punch 204e is formed integrally with the piercing punch 204 c. Therefore, a plurality of drawing punches 204e are provided side by side in the depth direction. The drawing punch 204e draws the sheet material 9 together with a drawing die 207e to be described later.

A piercing punch 204c is formed at the tip of the rod. The drawing punch 204e is formed on the outer periphery at a position slightly spaced apart from the tip end of the same rod. As described above, since the piercing punch 204c and the drawing punch 204e are integrally formed on the same rod, it is possible to continuously perform piercing and drawing in one punching operation (one stroke) by lowering the rod in the punching direction.

The lower die 205 is provided to face the lower side in the press direction so as to sandwich the plate material 9 with respect to the upper die 204. The lower die 205 is attached to the upper portion of the lower fixing plate 42 supported by the base 41. The lower die 205 has a trimming die 205 d.

The trimming die 205d performs trimming of the plate material 9 together with a trimming punch 206d to be described later. The trimming die 205d is formed in a block shape having the same outer shape as the intermediate member to be trimmed. At the time of trimming, the trimming punch 206d enters the inner peripheral space of the trimming die 205 d. The trimming die 205d is supported by the lower fixing plate 42 via a spring 205 f.

The upper movable die 206 is provided to be movable forward and backward with respect to the upper die 204, thereby molding the plate material 9. The upper movable die 206 has a pressing portion 206a, a drawing punch 206b, a trimming punch 206d, and a drawing punch 206 g.

The pressing portion 206a presses the sheet material 9 at the time of performing the first drawing process, the trimming process, the burring process, the piercing process, and the second drawing process on the sheet material 9. The pressing portion 206a is formed in a block shape having the same outer shape as the shape of the product to be molded. The pressing portion 206a is pressed by the lower upper fixing plate 10 via the spring 206 f.

The drawing punch 206b is pressed against the plate 9 by the upper movable plate 20 via the upper rod 25. The drawing punch 206b is pressed in a state of abutting against the upper bar 25 to perform the molding of the sheet material 9. The drawing punch 206b draws the sheet material 9 together with a drawing die 207b to be described later.

The inner periphery of the trimming punch 206d is formed in the same shape as the outer shape of the intermediate member to be molded. The trimming punch 206d presses the outer periphery of the plate material 9 pressed by the pressing portion 206a, and shapes the outer shape of the intermediate member subjected to trimming.

The drawing punch 206g is formed integrally with the trimming punch 206d at the inner periphery of the trimming punch 206 d. The drawing punch 206g draws the sheet 9 together with a drawing die 207g to be described later.

The lower movable die 207 is provided to be movable forward and backward with respect to the lower die 205, thereby molding the plate material 9. The lower movable die 207 has a pressing portion 207a, a drawing die 207b, a piercing die 207c, a drawing die 207e, a drawing die 207g, and a plate material supporting portion 207 h.

The pressing portion 207a holds the plate material 9 so as to sandwich the plate material 9 between the pressing portion and the pressing portion 206 a.

The drawing die 207b draws the sheet 9 together with the drawing punch 206 b. During the drawing process, the drawing punch 206b enters the drawing die 207 b. The drawing die 207b is integrally formed at an upper end portion of the pressing portion 207 a.

The punching die 207c performs punching processing on the sheet material 9 together with the punching male die 204 c. During the punching process, the punching male die 204c enters the receiving hole of the punching female die 207 c. A plurality of punch dies 207c are arranged side by side in the depth direction (the direction perpendicular to the paper surface). A punch die 207c is integrally formed at an upper end portion of the pressing portion 207 a. A punch die 207c is formed on the inner circumference of the drawing die 207 b.

The drawing die 207e draws the sheet 9 together with the drawing punch 204 e. During the drawing process, the drawing punch 204e enters the drawing die 207 e. The drawing die 207e is integrally formed with the punching die 207 c. Therefore, a plurality of drawing dies 207e are arranged side by side in the depth direction.

The drawing die 207g draws the sheet 9 together with the drawing punch 206 g. During the drawing process, the drawing punch 206g enters a space between the outer periphery of the drawing die 207g and the trimming die 205 d. A drawing die 207g is formed on the outer periphery of the pressing portion 207 a.

When the sheet material 9 is trimmed between the trimming die 205d and the trimming punch 206d, the sheet material support portion 207h holds the sheet material 9 between the trimming punch 206d and the trimming punch.

Further, the upper die 204 is provided to be removable with respect to the upper fixing plate 10, and the lower die 205 is provided to be removable with respect to the lower fixing plate 42. Further, the upper rod 25 and the upper movable die 206 abut against each other only when the plate material 9 is pressed. The mold 202 can be replaced in a state where the upper mold 204 is removed from the upper fixing plate 10 and the lower mold 205 is removed from the lower fixing plate 42 and the upper rod 25 is separated from the upper movable mold 206.

As described above, since the structures for generating the machining force by the mold 202 are integrated in the holder 10A and the holder 40A, it is not necessary to provide the mold 202 with a complicated structure, and the mold 202 can be downsized and modularized. Further, since the mold 202 is easily removed, the mold 202 can be easily replaced. Thus, for example, a mold that produces a relatively small number of parts can be easily manufactured.

Next, the press apparatus 200 will be explained.

The pair of upper fixing plates 10 are disposed apart from each other in parallel in the pressing direction. The pair of upper fixing plates 10 and the pair of vertical plates 11 together form a rectangular holder 10A.

A pair of air cylinders 23 are mounted on the lower surface of the upper fixing plate 10. The cylinder 23 moves in the press direction together with the upper fixing plate 10. The lower upper fixing plate 10 has an insertion hole through which the upper rod 25 is inserted. A stopper 45 is provided on the lower surface of the lower upper fixing plate 10.

The upper movable plate 20 is disposed between the pair of upper fixed plates 10, i.e., in the holder 10A. Here, an upper movable plate 20 is provided.

The upper movable plate 20 includes a base plate 21 and a lever holding plate 22. The cylinder 23 abuts on the upper surface of the upper movable plate 20. When the retainer 10A is lowered in the pressing direction, the cylinder 23 contracts. When the slider 1 lowers the holder 10A, the upper movable plate 20 moves up in the holder 10A while contracting the air cylinder 23.

The base plate 21 is disposed in parallel with the upper fixing plate 10. The base plate 21 can move up and down while maintaining a state of being parallel to the upper fixing plate 10. The upper end of the upper rod 25 abuts against the lower surface of the base plate 21.

The lever holding plate 22 abuts against the lower surface of the base plate 21. The lever holding plate 22 holds the upper lever 25 and the guide 26 to be perpendicular with respect to the base plate 21. The area of the lever holding plate 22 in the horizontal direction orthogonal to the press direction is the same as that of the base plate 21, but may be smaller than the base plate 21 as long as the upper lever 25 can be held.

The upper rod 25 is connected to the upper movable plate 20. The upper rod 25 is provided to be able to advance and retreat with respect to the upper die 204, and presses the drawing punch 206b against the sheet material 9 in the press direction.

The base 41 is formed in a flat plate shape and is provided on the floor surface. The base 41 supports the respective members constituting the press apparatus 200. The cylinder 63 is inserted into the base 41 from below.

The lower fixing plate 42 is provided apart from the base 41 between the base 41 and the lower die 205. A stopper 44 is provided on an upper surface of the lower fixing plate 42. A guide 65 is provided on the lower surface of the lower fixing plate 42.

The base 41 and the lower fixing plate 42 are fixed to each other by a pair of vertical plates 43 provided in parallel separated from each other in a direction perpendicular to the press direction. The base 41, the lower fixing plate 42, and the pair of vertical plates 43 form a rectangular holder 40A.

A guide 65 is provided in the pressing direction and inserted through a guide hole 66 formed in the lower movable plate 50. The guide 65 guides the lower movable plate 50 so as to be movable up and down while maintaining a parallel state.

The lower movable plate 50 is disposed between the base 41 and the lower fixed plate 42, i.e., in the holder 40A. The lower movable plate 50 is provided to be displaceable relative to the lower stationary plate 42 in the punching direction. The lower movable plate 50 is supported by the base 41 via the fixed block 62 in a state where the fixed block 62, which will be described later, is inserted. In a state where the fixed block 62 is not inserted, the lower movable plate 50 is supported upward by the cylinder 63.

A pressing portion 207a of the lower movable mold 207 is provided on the upper surface of the lower movable plate 50. When the retainer 10A is lowered, the pressing portion 207a is pressed by the upper movable mold 6, and the lower movable plate 50 is lowered and separated from the lower fixed plate 42.

The cylinder 63 is inserted from below the base 41 and advances and retreats with respect to the lower movable plate 50. The air cylinder 63 may abut on the lower movable plate 50. The air cylinder 63 is driven by an actuator such as an air cylinder or a motor to move in the vertical direction.

A fixing block 61 for fixing a position of the upper movable plate 20 with respect to the upper fixed plate 10 in the press direction is detachably provided between the upper surface of the upper movable plate 20 and the lower surface of the upper fixed plate 10.

The fixing block 61 is inserted in the depth direction (vertical direction to the paper). In a state where the fixed block 61 is not inserted, the upper movable plate 20 can be raised in the holder 10A while contracting the air cylinder 23. On the other hand, in the state where the fixed block 61 is inserted, the upper movable plate 20 cannot move in the press direction from the position (the position shown in fig. 6) where it abuts against the lower upper fixed plate 10.

Similarly, a fixing block 62 for fixing the position of the lower movable plate 50 with respect to the base 41 in the press direction is detachably provided between the lower surface of the lower movable plate 50 and the upper surface of the base 41.

The fixing block 62 is inserted in the depth direction (the direction perpendicular to the paper surface). In a state where the fixed block 62 is not inserted, the lower movable plate 50 can be raised in the holder 40A while contracting the air cylinder 63. On the other hand, in the state where the fixed block 62 is inserted, the lower movable plate 50 cannot move in the press direction from the position (the position shown in fig. 6) where it abuts against the lower fixed plate 42.

The fixed block 61 and the fixed block 62 are driven by actuators such as an air cylinder and a motor, respectively.

Next, a pressing method using the pressing apparatus 200 will be described with reference to fig. 7 to 13. Fig. 7 to 13 are views for explaining first to seventh steps in a pressing method using the pressing apparatus 200.

As shown in fig. 7, when the slider 1 lowers the holder 10A in the pressing direction, the pressing portion 206a comes into contact with the plate member 9. The pressing portion 206a is pressed against the plate material 9 by the urging force of the spring 206 f. The pressing portion 206a holds the plate material 9 between it and the pressing portion 207 a.

At this time, the fixed block 61 is inserted between the upper fixed plate 10 and the upper movable plate 20. Therefore, the upper movable plate 20 is in a state of being immovable relative to the upper stationary plate 10 in the press direction. Further, a fixed block 62 is inserted between the lower fixed plate 42 and the lower movable plate 50. Therefore, the lower movable plate 50 is in a state of being immovable relative to the lower fixed plate 42 in the press direction.

As shown in fig. 8, when the slide 1 further lowers the holder 10A in the press direction, the drawing punch 206b comes into contact with the plate 9. Since the upper movable plate 20 is lowered together with the holder 10A, the force of the slider 1 to lower the holder 10A is transmitted to the drawing punch 206b via the upper rod 25. Thereby, the drawing punch 206b presses the sheet material 9 against the drawing die 207b to perform the first drawing process for the first time.

At this time, the pressing portion 6a is biased by the spring 6f, and the force pressing the plate member 9 is in a small state suitable for the drawing process.

Then, as shown in fig. 9, the slider 1 slightly raises the holder 10A so that the force is not transmitted to the fixed block 61. In this state, the fixing block 61 is removed. When the fixed block 61 is removed, the upper movable plate 20 is movable in the punching direction with respect to the upper stationary plate 10.

At the same time, the air cylinder 63 presses the lower movable portion 50 upward and against the lower fixed plate 42. Thus, the force is not transmitted from the lower movable plate 50 to the fixed block 62. The fixed block 62 is removed in this state. When the fixed block 62 is removed, the lower movable plate 50 is movable in the punching direction relative to the lower fixed plate 42.

As shown in fig. 10, when the slider 1 further lowers the holder 10A in the press direction, the trimming punch 206d is lowered in a state of holding the sheet material 9 between it and the sheet material support portion 207 h. Thereby, the trimming punch 206d performs trimming of cutting the plate material 9 between itself and the trimming die 205 d. Thereby, the outer shape of the plate material 9 is formed into a predetermined shape.

At this time, the drawing punch 206b is pressed in the pressing direction by the upper rod 25, and the drawing die 207b moves so as to press the lower movable plate 50 downward by the pressing force. In this manner, the drawing die 207b is lowered, and the trimming die 205d is relatively raised, so that the sheet material 9 can be trimmed between the trimming die and the trimming punch 206 d.

Then, as shown in fig. 11, the slider 1 raises the holder 10A, and the air cylinder 63 presses the lower movable plate 50 upward, so that the lower movable plate 50 pressed downward is pressed upward to a position abutting against the lower fixed plate 42. Then, the fixed block 62 is inserted again between the lower fixed plate 42 and the lower movable plate 50. Thereby, the lower movable plate 50 cannot move relative to the lower fixed plate 42 in the press direction.

As shown in fig. 12, when the slider 1 again lowers the holder 10A in the pressing direction, the upper movable plate 20 is pressed against the upper rod 25, and is separated from the lower upper fixed plate 10 and raised. At this time, the cylinder 23 is compressed and contracted by the force transmitted from the upper movable plate 20.

At the same time, the piercing punch 204c attached to the lower portion of the lower upper retainer 10 enters the piercing die 207c to perform piercing processing for piercing the plate 9.

At this time, the tension punch 206b is pressed by the upper movable plate 30 and functions as a pressing portion. The force with which the drawing punch 206b presses the sheet material 9 becomes a large state suitable for the piercing process.

Further, at the same time, the drawing punch 206g enters the space of the outer periphery of the pressing portion 207 a. Thereby, the drawing punch 206g draws the outer periphery of the plate material 9 together with the drawing die 207 g.

As shown in fig. 13, when the slider 1 further lowers the retainer 10A in the pressing direction, the piercing punch 204c attached to the lower portion of the lower upper retainer 10 is further lowered. Thereby, the drawing punch 204e integrated with the piercing punch 204c comes into contact with the plate 9. Thereby, the drawing punch 204e presses the sheet material 9 against the drawing die 207e to perform the second drawing process of drawing the periphery of the hole formed by the piercing punch 204 c. In this way, the piercing punch 204c that performs piercing is first brought into contact with the plate material 9 to perform molding, and the drawing punch 206g that performs second drawing is then brought into contact with the plate material 9 to perform molding.

Here, the piercing process shown in fig. 12 and the drawing process shown in fig. 13 will be described in detail with reference to fig. 14(a) to 14 (e).

As shown in fig. 14(a), when the slider 1 lowers the holder 10A in the press direction, the tip of the piercing punch 204c comes into contact with the plate material 9. When the retainer 10A is further lowered while this state is maintained, as shown in fig. 14(b), the piercing punch 204dc presses the plate material 9, and the pressed portion of the plate material 9 protrudes downward to form a protruding portion 9a, and the periphery thereof is deformed so as to bulge downward to form a bulging portion 9 b.

As shown in fig. 14(c), when the slider 1 further lowers the holder 10A in the press direction, the leading end of the piercing punch 204c pierces the plate 9. At this time, since the bulging portion 9b is not supported from below, the piercing punch 204c performs preliminary drawing on the bulging portion 9b around the piercing hole formed by the piercing process while performing the piercing process on the sheet material 9.

As shown in fig. 14(d), when the slider 1 further lowers the holder 10A in the pressing direction, the tapered portion 204f, which is tapered on the outer periphery of the piercing punch 204c, expands the piercing hole toward the outer periphery.

As shown in fig. 14(e), when the retainer 10A is further lowered while maintaining this state, the drawing punch 204e comes into contact with the plate 9. Then, the drawing punch 204e performs drawing processing on the sheet 9 between it and the drawing die 207 e. This makes it possible to form the bulging portion 9b, which has been subjected to preliminary drawing during the punching process, into a desired shape. At the same time, since the large-diameter portion 204g formed continuously with the tapered portion 204f of the piercing punch 204c is inserted into the piercing hole, the inner diameter of the piercing hole can be also molded to a target inner diameter.

In general, in the press working, it is common to perform a punching working after performing a drawing working. However, in the press apparatus 200, as shown in fig. 14(a) to 14(e), the preliminary drawing process, the piercing process, and the drawing process are continuously performed, and thereby the drawing process can be performed after the piercing process.

As described above, in the press apparatus 200, the slider 1 is raised and lowered after the first drawing process for the first time, and the trimming process or the piercing process is performed before the second drawing process for the second time. Specifically, the first drawing process and the deburring process are followed by the piercing process, and the second drawing process is followed by the piercing process. Therefore, the sheet material 9 can be subjected to the first drawing process, the trim process, the piercing process, and the second drawing process in one press work. Therefore, it is possible to perform a plurality of times of molding in one press operation without using a die having a complicated structure.

According to the second embodiment described above, the following effects can be exhibited.

The press apparatus 200 for molding the sheet material 9 by the die 202 having the upper die 204, the upper movable die 206 provided to be movable forward and backward with respect to the upper die 204, the lower die 205, and the lower movable die 207 provided to be movable forward and backward with respect to the lower die 205 includes: a pair of upper fixing plates 10 which are driven by a servo motor to move an upper die 204 up and down with respect to the plate material 9 and are provided so as to be spaced apart from each other in a pressing direction in which the die 202 presses the plate material 9; an upper movable plate 20 which moves the upper movable die 206 relative to the upper die 204 in the press direction and is provided so as to be displaceable relative to the upper fixed plates 10 in the press direction between the pair of upper fixed plates 10; a base 41; a lower fixing plate 42 provided apart from the base 41 between the base 41 and the lower die 205; and a lower movable plate 50 which moves the lower movable mold 207 relative to the lower mold 205 in the press direction, and which is provided so as to be displaceable relative to the lower fixed plate 42 in the press direction between the base 41 and the lower fixed plate 42.

In this structure, an upper movable plate 20 displaceable relative to an upper stationary plate 10 in a punching direction and a lower movable plate 50 displaceable relative to a lower stationary plate 42 in the punching direction are provided. Therefore, the upper mold 204 provided in the upper fixed plate 10, the upper movable mold 206 connected to the upper movable plate 20, and the lower movable mold 207 connected to the lower movable plate 50 and the lower mold 205 provided in the lower fixed plate 42 enable multiple molding. Therefore, since the upper movable plate 20 and the lower movable plate 50 can be provided to perform molding a plurality of times, it is not necessary to provide the mold 202 with a complicated structure. Therefore, it is possible to perform a plurality of times of molding in one press operation without using a die having a complicated structure.

In a press method for forming a sheet material 9 by a die 202 having an upper die 204, an upper movable die 206 and a lower die 205 provided so as to be movable forward and backward with respect to the upper die 204, and a lower movable die 207 provided so as to be movable forward and backward with respect to the lower die 205, the upper die 204 is moved in a press direction in which the die 202 presses the sheet material 9 by a slide 1 driven by a servo motor, the press method includes a drawing process, a piercing process, and a trimming process, the slide 1 is raised after a first drawing process which is a first drawing process to make the lower movable die 207 immovable, and then the slide 1 is lowered again, and the trimming process or the piercing process is performed before a second drawing process which is a second drawing process.

In this configuration, the slider 1 lowered after the first drawing process for the first time is raised to make the lower movable die 207 immovable, and then the slider 1 is lowered again to perform the trimming process or the piercing process. Thus, after the slider 1 is raised, the fixing block 62 is reliably inserted to fix the position of the lower movable plate 50 with respect to the base 41 in the pressing direction. Therefore, the force with which the lower movable die 207 presses the plate material 9 can be switched from a small state suitable for the first drawing process to a large state suitable for the trimming process and the piercing process.

Further, a press method of forming the plate material 9 by the die 202 having the upper die 204 and the upper movable die 206 provided to be movable forward and backward with respect to the upper die 204 includes a drawing process and a piercing process, the piercing punch 204c for performing the piercing process and the drawing punch 204e for performing the drawing process are integrally formed, the piercing punch 204c for performing the piercing process is brought into contact with the plate material 9 first, and then the drawing punch 204e for performing the drawing process is brought into contact with the plate material 9 to perform the forming.

According to this configuration, since the piercing punch 204c for performing piercing and the drawing punch 204e for performing drawing are formed integrally, it is possible to continuously perform piercing and drawing in one press operation (one stroke) by only lowering the holder 10A by the slider 1.

(third embodiment)

A pressing device 300 according to a third embodiment of the present invention and a pressing method using the pressing device 300 will be described below with reference to fig. 15 to 20.

First, the overall structure of the press apparatus 300 will be described with reference to fig. 15. Fig. 15 is a structural view of the press apparatus 300.

The press apparatus 300 is a servo press apparatus in which the slide 1 is moved up and down by a servo motor (not shown) as a driving means. The press apparatus 300 presses the plate material 9 by the die 302. The press apparatus 300 includes a pair of upper fixed plates 10, an upper movable plate 20, a pair of upper rods 25, a base 41, and a pair of lower movable plates 50 and 52.

First, a die 302 used by being attached to the press apparatus 300 will be described.

The mold 302 has an upper mold 304, a lower mold 305, an upper movable mold 306, and a lower movable mold 307. Here, in one press operation (one stroke), the die 302 performs the first drawing, the trimming, the burring, the piercing, and the second drawing on the plate material 9, as in the second embodiment.

The upper mold 304 is mounted to a lower portion of the lower upper fixing plate 10. The upper die 304 is disposed to face the upper side of the pressing direction with respect to the plate material 9. The upper movable mold 306 is provided on the upper mold 304 so as to be movable forward and backward with respect to the upper mold 304 in the press direction. The upper die 304 has a trimming punch 304d and a drawing punch 304 g. Further, the upper die 304 has a piercing punch 204c and a drawing punch 204 e. The piercing punch 204c and the drawing punch 204e are the same as those of the press device 200 of the second embodiment, and therefore, detailed description thereof is omitted.

The inner periphery of the trimming punch 304d is formed in the same shape as the outer shape of the intermediate member to be molded. The trimming punch 304d performs trimming of the plate material 9 together with a trimming die 307d to be described later. The trimming punch 304d presses the outer periphery of the plate material 9 pressed by a pressing portion 306a to be described later, and shapes the outer shape of the intermediate member to be trimmed.

The drawing punch 304g is provided to overlap the upper portion of the trimming punch 304 d. Therefore, when the retainer 10A is lowered, the drawing punch 304g continues the drawing process of the plate material 9 after the trimming punch 304d trims the plate material 9. The sheet 9 is stretched by the stretching punch 304g together with the stretching die 305 g.

The lower die 305 is provided to face the lower side in the press direction so as to sandwich the plate material 9 with respect to the upper die 304. The lower die 305 is attached to the upper portion of the base 41. The lower die 305 includes a pressing portion 305a, a drawing die 305b, a punching die 305c, a drawing die 305e, and a drawing die 305 g.

The pressing portion 305a holds the plate material 9 so as to sandwich the plate material 9 between the pressing portion and a pressing portion 306a to be described later.

The drawing die 305b draws the sheet material 9 together with a drawing punch 306b to be described later. During the drawing process, the drawing punch 306b enters the drawing die 305 b. The drawing die 305b is integrally formed at an upper end portion of the pressing portion 305 a.

The punching die 305c performs punching processing on the sheet material 9 together with the punching male die 204 c. During the piercing process, the piercing punch 204c enters the receiving hole of the piercing die 305 c. A plurality of punch dies 305c are arranged in parallel in the depth direction (the direction perpendicular to the paper surface). The punch die 305c is integrally formed at the upper end of the pressing portion 305 a. A punch die 305c is formed on the inner periphery of the drawing die 305 b.

The drawing die 305e draws the sheet 9 together with the drawing punch 204 e. During the drawing process, the drawing punch 204e enters the drawing die 305 e. The drawing die 305e is integrally formed with the punching die 305 c. Therefore, a plurality of the drawing dies 305e are arranged side by side in the depth direction.

The drawing die 305g draws the sheet 9 together with the drawing punch 304 g. During the drawing process, the drawing punch 304g enters the space on the outer periphery of the drawing die 305 g. A drawing die 305g is formed on the outer periphery of the pressing portion 306 a.

The upper movable die 306 is set to be movable forward and backward with respect to the upper die 304, thereby molding the plate material 9. The upper movable die 306 has a pressing portion 306a and a drawing punch 306 b.

The pressing portion 306a presses the sheet material 9 at the time of performing the first drawing process, the trimming process, the burring process, the piercing process, and the second drawing process on the sheet material 9. The pressing portion 306a is formed in a block shape having the same outer shape as the shape of the product to be molded. The pressing portion 306a is pressed by a pressing member 327 to be described later via a spring 306 f.

The drawing punch 306b is pressed against the plate 9 by the upper movable plate 20 via a pair of upper rods 25. The drawing punch 306b is pressed in a state of abutting against the upper bar 25 to mold the sheet material 9. The drawing punch 306b draws the sheet 9 together with the drawing die 305 b. The drawing punch 306b is provided integrally with a pressing member 327 that receives the pressing force of the upper rod 25.

The pressing member 327 supports the pressing portion 306a by the spring 306 f. In a state where the holder 10A does not start to descend (the state shown in fig. 14), the pressing member 327 is pressed by the upper rod 25, and the lower surface thereof abuts against the upper surface of the drawing punch 304 g. When the retainer 10A is lowered to some extent, the lower surface of the pressing member 327 is separated from the upper surface of the tension punch 304g, and the pressing member 327 presses the upper movable plate 20 upward via the upper rod 25.

The lower movable die 307 is set to be movable forward and backward with respect to the lower die 305, thereby molding the plate material 9. The lower movable die 307 has a trimming die 307 d.

The trimming female die 307d performs trimming processing on the plate 9 together with the trimming male die 304 d. The trimming die 307d is formed in a block shape having the same outer shape as the intermediate member to be trimmed. At the time of trimming, the trimming punch 304d enters the inner peripheral space of the trimming die 307 d.

When the sheet material 9 is trimmed between the trimming die 307d and the trimming punch 304d, the upper surface of the trimming die 307d supports the sheet material 9 from below.

Further, the upper mold 304 is provided to be removable with respect to the upper fixed plate 10, and the lower mold 305 is provided to be removable with respect to the lower movable plate 50. Further, the upper rod 25 and the upper movable die 306 abut against each other only when pressing the plate material 9. The mold 302 can be replaced in a state where the upper mold 304 is removed from the upper fixed plate 10, the lower mold 305 is removed from the lower movable plate 50, and the upper rod 25 is separated from the upper movable mold 306.

As described above, since the structures for generating the machining force by the mold 302 are integrated in the holder 10A and between the base 41 and the lower movable plates 50 and 52, there is no need to provide the mold 302 with a complicated structure, and the mold 302 can be downsized and modularized. Further, the mold 302 is easily removed, and therefore, replacement of the mold 302 can be easily performed. Thus, for example, a mold that produces a relatively small number of parts can be easily manufactured.

Next, the press apparatus 300 will be explained.

The pair of upper fixing plates 10 are disposed apart from each other in parallel in the pressing direction. The pair of upper fixing plates 10 and the pair of vertical plates 11 together form a rectangular holder 10A.

A pair of air cylinders 23 are mounted on the lower surface of the upper fixing plate 10. The cylinder 23 moves in the press direction together with the upper fixing plate 10. The lower upper fixing plate 10 has an insertion hole through which the upper rod 25 is inserted. A stopper 45 and a cylinder 46 are provided on the lower surface of the lower upper fixing plate 10.

The cylinder 46 faces a block 54 attached to the lower movable plate 50. The cylinder 46 abuts against the block 54 by the lowering of the holder 10A, and then the lower movable plate 50 is pressed downward by the block 54.

The upper movable plate 20 is disposed between the pair of upper fixed plates 10, i.e., in the holder 10A. Here, an upper movable plate 20 is provided.

The upper movable plate 20 includes a base plate 21 and a lever holding plate 22. The cylinder 23 abuts on the upper surface of the upper movable plate 20. When the retainer 10A is lowered in the pressing direction, the cylinder 23 contracts. When the slider 1 lowers the holder 10A, the upper movable plate 20 moves up in the holder 10A while contracting the air cylinder 23.

The base plate 21 is disposed in parallel with the upper fixing plate 10. The base plate 21 can move up and down while maintaining a state of being parallel to the upper fixing plate 10. The upper end of the upper rod 25 abuts the base plate 21.

The lever holding plate 22 abuts against the lower surface of the base plate 21. The lever holding plate 22 holds a pair of upper levers 25 and a pair of guides 26 to be perpendicular with respect to the base plate 21. The area of the lever holding plate 22 in the horizontal direction orthogonal to the press direction is the same as that of the base plate 21, but may be smaller than the base plate 21 as long as the upper lever 25 can be held.

The upper rod 25 is connected to the upper movable plate 20. The upper rod 25 is provided to be movable forward and backward with respect to the upper movable die 306, and presses the drawing punch 206b against the sheet material 9 in the press direction.

The base 41 is formed in a flat plate shape and is provided on the floor surface. The base 41 supports the respective members constituting the press apparatus 300. The pressing portion 305a, the stopper 44, the air cylinder 47, the air cylinder 48, and the guide 49 are provided on the base 41 so as to be perpendicular upward from the upper surface of the base 41. In addition, an ejector (ejector)57 for removing the molded product from the lower mold 305 is provided on the base 41.

When the lower movable plate 50 is lowered as the retainer 10A is lowered, the air cylinder 47 abuts against the lower surface of the lower movable plate 50, and supports the lower movable plate 50 from below.

The air cylinder 48 is inserted through a through hole of the lower movable plate 50. The cylinder 48 abuts against a lower surface of a lower movable plate 52 disposed on the lower movable plate 50, and supports the lower movable plate 52 from below.

The guide 49 is inserted through the lower movable plate 50. The guide 49 guides the movement of the lower movable plate 50 relative to the base 41 in the press direction.

The lower movable plates 50, 52 are provided parallel to the base 41. The lower movable plates 50, 52 are provided so as to be displaceable relative to the base 41 in the punching direction. The lower movable plates 50, 52 can move up and down while maintaining a state of being parallel to the base 41.

The lower movable plate 50 is supported from below by a spring 51 abutting on a lower surface thereof. When the lower movable plate 50 is lowered in the pressing direction while compressing the spring 51, it abuts against the cylinder 47. The trimming die 307d and the pair of blocks 54 are provided on the lower movable plate 50 so as to be perpendicular upward from the upper surface of the lower movable plate 50.

The lower movable plate 52 is disposed to be stacked on the upper side of the lower movable plate 50. The cylinder 48 abuts against a lower surface of the lower movable plate 52. The lower movable plate 52 has a guide 53.

The guide 53 is provided to face downward from the lower movable plate 52. The guide 53 is inserted through the lower movable plate 50. The guide 53 guides the movement of the lower movable plate 52 relative to the lower movable plate 50 in the press direction.

The block 54 is disposed to surround the lower movable plate 52. The block 54 also guides movement of the lower movable plate 52 relative to the lower movable plate 50 in the pressing direction. If the cage 10A is lowered, the cylinder 46 abuts the block 54.

The plate material support portion 56 is supported by a spring 56a in a state of being suspended above the lower movable plate 52. The plate material support portion 56 is biased upward by a spring 56 a. The plate material support portion 56 supports the plate material 9 supplied from the outside from below at the height of supply. The plate material support portion 56 supports the plate material 9 so as to sandwich the plate material 9 between the plate material support portion and the pressing portion 306 a.

Next, a pressing method using the pressing device 300 will be described with reference to fig. 16 to 20. Fig. 16 to 20 are views for explaining first to fifth steps in a pressing method using the pressing apparatus 300.

As shown in fig. 16, when the slider 1 lowers the holder 10A in the pressing direction, the pressing portion 306a comes into contact with the plate member 9. The pressing portion 306a is pressed against the plate material 9 by the urging force of the spring 306 f. The pressing portion 306a holds the plate material 9 between it and the plate material support portion 56.

As shown in fig. 17, when the slider 1 further lowers the holder 10A in the press direction, the lower surface of the trimming punch 304d comes into contact with the plate material 9. When the holder 10A is lowered while maintaining this state, the air cylinder 46 abuts on the block 54 and is pressed downward. Thereby, the lower movable plate 50 is lowered to abut against the cylinder 47. At this time, the air cylinder 48 is pushed downward by the lower movable plate 52 to contract.

Further, the force of the trimming punch 304d pressing the sheet material support portion 56 downward overcomes the urging force of the spring 56a urging the sheet material support portion 56, and moves the sheet material support portion 56 downward. At the same time, the upper surface of the trimming die 307d is brought into contact with the lower surface of the plate material 9 by the lowering of the lower movable plate 52.

When the slide 1 further lowers the holder 10A in the press direction, the drawing punch 306b comes into contact with the plate material 9. Since the upper movable plate 20 is lowered together with the holder 10A, the force of the slider 1 to lower the holder 10A is transmitted to the drawing punch 306b via the upper rod 25. Thereby, the drawing punch 306b presses the sheet material 9 against the drawing die 305b to perform the first drawing process for the first time.

At this time, the pressing portion 306a is urged by the spring 306f, and the force pressing the plate member 9 is in a small state suitable for the drawing process.

As shown in fig. 18, when the slider 1 further lowers the holder 10A in the press direction, the trimming punch 304d is lowered. Thereby, the trimming punch 304d performs trimming of cutting the plate material 9 between the trimming punch and the trimming die 307 d. Thereby, the outer shape of the plate material 9 is formed into a predetermined shape.

At this time, the drawing punch 306b is pressed in the press direction by the upper rod 25, and the drawing punch 306b moves to press the upper movable plate 20 upward by the pressing force. Thereby, the upper movable plate 20 is separated from the lower upper stationary plate 10 and ascends. At this time, the cylinder 23 is compressed and contracted by the force transmitted from the upper movable plate 20.

The cylinder 48 is pressed downward by the lower movable plate 52 and contracts. The cylinder 47 and the spring 51 are also pressed downward by the lower movable plate 50 to contract.

As shown in fig. 19, when the slider 1 further lowers the holder 10A in the pressing direction, the upper movable plate 20 is pressed by the upper rod 25, and further separated from the lower upper fixed plate 10 and raised. The cylinder 23 is compressed by a force transmitted from the upper movable plate 20 and further contracted.

At the same time, the piercing punch 204c attached to the lower portion of the lower upper retainer 10 enters the piercing die 305c to perform piercing processing for piercing the plate material 9.

At this time, the drawing punch 306b is pressed by the upper movable plate 20 to function as a pressing portion. The force with which the drawing punch 306b presses the sheet material 9 becomes a large state suitable for the piercing process.

Further, at the same time, the drawing punch 304g enters the space between the outer peripheries of the pressing portions 305 a. Thereby, the drawing punch 304g draws the outer periphery of the plate material 9 together with the drawing die 305 g.

As shown in fig. 20, when the slider 1 further lowers the retainer 10A in the pressing direction, the piercing punch 204c attached to the lower portion of the lower upper retainer 10 is further lowered. Thereby, the drawing punch 204e integrated with the piercing punch 204c comes into contact with the plate 9. Thereby, the drawing punch 204e performs the second drawing process of pressing the sheet material 9 against the drawing die 305e to draw the periphery of the hole formed by the piercing punch 204 c. In this way, the piercing punch 204c that performs piercing is first brought into contact with the plate material 9 to perform molding, and the drawing punch 206g that performs second drawing is then brought into contact with the plate material 9 to perform molding.

The details of the piercing process shown in fig. 19 and the drawing process shown in fig. 20 are the same as those described with reference to fig. 14(a) to 14(e), and therefore, the description thereof is omitted here.

According to the third embodiment described above, the following effects can be exhibited.

In the press apparatus 300, after the first drawing process for the first time, the trimming process or the punching process is performed before the second drawing process for the second time. Specifically, the first drawing process and the deburring process are followed by the piercing process, and the second drawing process is followed by the piercing process. Therefore, the sheet material 9 can be subjected to the first drawing process, the trim process, the piercing process, and the second drawing process in one press work. Therefore, molding can be performed a plurality of times in one press operation (one stroke) without using a die having a complicated structure.

Further, a press method of forming the plate material 9 by the die 202 having the upper die 204 and the upper movable die 206 provided to be movable forward and backward with respect to the upper die 204 includes a drawing process and a piercing process, the piercing punch 204c for performing the piercing process and the drawing punch 204e for performing the drawing process are integrally formed, the piercing punch 204c for performing the piercing process is brought into contact with the plate material 9 first, and then the drawing punch 204e for performing the drawing process is brought into contact with the plate material 9 to perform the forming.

According to this configuration, since the piercing punch 204c for performing piercing and the drawing punch 204e for performing drawing are formed integrally, it is possible to continuously perform piercing and drawing in one press operation (one stroke) by only lowering the holder 10A by the slider 1.

Although the embodiments of the present invention have been described above, the above embodiments are merely some of application examples of the present invention, and the technical scope of the present invention is not limited to the specific configurations of the above embodiments.

The application claims priority to the special application 2019-043876, which was filed in the office on day 11/3/2019, and the entire content of the application is incorporated in the specification of the application by reference.

Claims (5)

1. A press apparatus for forming a plate material by using a die having an upper die and an upper movable die provided to be movable forward and backward relative to the upper die, comprising:

a pair of upper fixing plates provided to be spaced apart from each other in a pressing direction in which the die presses the plate material, and driven by a driving unit to lift and lower the upper die with respect to the plate material; and

an upper movable plate which is provided so as to be displaceable relative to the upper fixed plate in the punching direction between the pair of upper fixed plates and which is pressed in the punching direction so as to change a pressing force of the upper movable die against the plate material when pressed by the upper fixed plate,

the plurality of upper movable plates are arranged to be stacked in the press direction between the pair of upper fixed plates.

2. The stamping apparatus of claim 1, further comprising:

an upper rod connected to the upper movable plate and arranged to advance and retreat with respect to the upper movable die and press the upper movable die toward a plate material in the press direction,

the upper rod connected to the upper movable plate disposed above is disposed to penetrate the upper movable plate disposed below.

3. Punching device according to claim 1,

the upper movable plate has a first upper movable plate and a second upper movable plate,

the punching device further includes:

a first cylinder that moves in the press direction together with the upper fixed plate and presses the first upper movable plate; and

a second cylinder that moves in the press direction together with the upper fixed plate and presses the second upper movable plate,

the second cylinder and the second upper movable plate are separated from each other when the first cylinder presses the first upper movable plate to mold a plate material using the upper movable die.

4. A press apparatus for forming a plate material by using a die having an upper die, a lower die, and a lower movable die provided to be movable forward and backward relative to the lower die, comprising:

an upper fixing plate which is driven by a driving unit to lift the upper die relative to the plate;

a base station; and

a lower movable die which is provided so as to be displaceable relative to the base in a pressing direction in which the die presses the plate material and which moves the lower movable die relative to the lower die in the pressing direction,

the upper die comprises a first upper die arranged below the stamping direction and a second upper die arranged above the stamping direction relative to the first upper die,

the first upper die performs first molding of a plate material together with the lower movable die fixed to the lower movable plate,

the second upper die and the lower die are used for carrying out second forming on the plate,

the upper mold and the lower movable plate are lowered together when the second upper mold and the lower mold are used for molding.

5. A press method for forming a sheet material by using the press apparatus according to claim 4,

the upper die comprises a drawing die and a perforating die,

the perforating die and the drawing die are formed as one body,

the punching die is first abutted against the plate material to perform punching processing, and then the drawing die is abutted against the plate material to perform drawing processing.

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