JP2006255781A - Draw forming device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a draw forming device which restrains deflection at the center of a blank material set in a mold and minimizes dimensional variations in a formed product. <P>SOLUTION: In the draw forming device 11, a blank holder 16 comprises a first retaining means 32 which binds the outermost circumference 31 of the blank material 15, and a second retaining means 33 which is placed inward of the first retaining means 32. Due to the descent of a double-acting press 17 the retaining position B1 of the first retaining means 32 is made a position where the first retaining means 32 holds the blank material 15 ahead of the second retaining means 33, and a position where the double-acting press 17 descends further is made the retaining position B2 of the second retaining means 33. A mold (cope) 27 is supported slidably by the second retaining means 33 and is placed away from an inner slider 21. The first and second retaining means 32 and 33 are fixed in an integrated manner to an outer slider 22 which is placed outward of the inner slider 21. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a drawing apparatus that attaches to a double-action press and applies a pressing force to the plate material to form and press the plate in advance by the operation of the double-action press.

When plastic working is performed with a mold attached to a press machine, there is one in which the periphery of the blank material is constrained by pressing with a blank holder to form a molded product (for example, see Patent Document 1).
Japanese Utility Model Publication No. 1-153820 (page 16, FIGS. 3 to 5)

Patent document 1 is demonstrated based on the following figure.
12 (a) to 12 (c) are diagrams for explaining the basic configuration of the conventional technique. The conventional drawing mold 201 includes an upper mold wrinkle retainer 203 for an upper mold 202 and a lower mold wrinkle retainer 205 for a lower mold 204. FIG. And press the end of the blank B with the pad 206 and the cushion 207. First, as shown in (b), the first stage of drawing (cylindrical portion G1) is completed with the punch 208. Furthermore, as shown in (c), the apparatus completes the second stage drawing (rectangular trapezoidal portion G2) with the cushion 207, and can be molded in one step.

However, in the drawing die 201 of Patent Document 1, the punch 208 is arranged below, but depending on the conditions, the punch may be arranged above. When the drawing die 201 is turned upside down, the blank 206 is set on the pad 206. Then, a deflection occurs in the center of the blank B. In particular, when the thickness of the blank is extremely thin or when a thin blank is hot-formed (including warm), it tends to bend easily and the amount of deflection tends to be large. As a result, there is a concern that the dimensional variation of the molded product becomes large.
Further, Patent Document 1 has a configuration in which a pad 206 slides in the upper mold 202, and when resistance at the time of plastic deformation is applied to the pad 206, a variation in dimensions of a molded product may increase, and molding accuracy may be increased. It is difficult to raise.

  It is an object of the present invention to provide a drawing apparatus that suppresses the deflection at the center of a blank material set in a mold and reduces the dimensional variation of a molded product.

  The invention according to claim 1 is a drawing apparatus that includes a blank holder that holds a blank material and a mold that is arranged above and below to give a predetermined shape, and performs drawing with the mold. It consists of the 1st restraining means which restrains the outermost peripheral part of a blank material, and the 2nd restraining means arrange | positioned inside the 1st restraining means, The restraint position of a 1st restraining means is a double-acting press machine. As a result of the lowering, the double-resisting press is further lowered with respect to the restraining position of the first restraining means, with the restraining position of the second restraining means being set to the position for holding the blank material prior to the second restraining means. The position is constrained, the mold is slidably supported by the second restraining means, the mold is disposed away from the inner slider of the double-acting press, and the first and second restraining means are disposed on the inner slider. Outer outers Characterized in that it is fixed integrally to Ida.

  In the invention according to claim 1, the restraining position of the first restraining means is set to a position for holding the blank material prior to the second restraining means by the lowering of the outer slider of the double-action press. The position where the double-acting press is further lowered with respect to the position where the first restraining means is restrained is the position where the restraining position is restrained. As a result, a tensile force is applied to the center of the blank material connected to the outermost peripheral portion in the process of reaching the restraining position of the second restraining means while the outermost peripheral portion is restrained at the restraining position of the first restraining means. In addition, there is an advantage that the deflection at the center of the blank can be removed.

  In the drawing apparatus, since the first and second restraining means are integrally fixed to the outer slider, there is no movement between the outer slider and the first and second restraining means, and the size of the molded product is reduced. There is an advantage that variation can be reduced.

The best mode for carrying out the present invention will be described below with reference to the accompanying drawings. The drawings are viewed in the direction of the reference numerals.
FIG. 1 is a cross-sectional view of the drawing apparatus of the present invention. The left axis in the figure is a coordinate axis, X is a horizontal axis and is a longitudinal axis of the blank, Y is an axis orthogonal to X, and Z is a vertical axis orthogonal to X and Y.
The drawing apparatus 11 includes a mold 12 (consisting of an upper mold 13 and a lower mold 14) and a blank holder 16 that is disposed on the mold 12 and holds the blank material 15. A double-acting press 17. It is attached to and performs drawing.

  The double-acting press 17 is an existing double action press machine, and an inner slider 21 that applies a pressing force to the blank material 15 for forming, and an outer slider that is disposed outside the inner slider 21 and presses the blank material 15. 22 and the outer slider 22 is moved up and down by, for example, hydraulic pressure alone. Reference numeral 23 denotes a bet.

The upper mold 13 includes an upper base 25 that is integrally attached to the outer slider 22 of the double-acting press 17 and an upper mold 27 that is disposed in an opening 26 formed in the center of the upper base 25.
The lower die 14 includes a lower base 28 attached to the bed 23 of the double-acting press 17 and a lower die 29 fixed to the lower base 28 at the center.

The blank holder 16 includes a first restraining means 32 that restrains the outermost peripheral portion 31 of the blank material 15, and a second restraining means 33 that is disposed inside the first restraining means 32.
The first restraining means 32 integrally fixes the first upper pressing member 34 to the upper base 25 with bolts 35... A first lower pressing member 37 is slidably attached (in the Z-axis direction) via cylinders 36.

The first upper pressing member 34 is formed with a main body 41 of a size that abuts on the outermost peripheral portion 31 of the blank material 15 in a substantially rectangular shape, and a first upper pressing surface 42 is formed on the main body 41. The first upper pressing surface 42 is set as the restraining position B1 of the first restraining means 32, and the upper surface of the blank 15 is pressed.
The restraining position B1 of the first restraining means 32 is a position for holding the blank material 15 prior to the second restraining means 33.

  The first lower pressing member 37 is formed with a main body 45 facing the main body 41 of the first upper pressing member 34 in a substantially rectangular shape, a first lower pressing surface 46 is formed on the main body 45, and set on the first lower pressing surface 46. A shaft 47 is attached, a guide hole 48 is formed, a guide post 52 is fitted into the guide hole 48 via a collar 51, the guide post 52 is attached to the lower base 28, and the first cylinder 36 is attached to the lower base 28. Are attached, the rod of the first cylinder 36 is connected to the main body 45, and the lower surface of the blank 15 is pressed.

The guide post 52 guides the first lower pressing member 37. The total length of the guide post 52 is an example, and can be a length that does not protrude from the first lower pressing surface 46, for example.
The escape hole 44 of the first upper pressing member 34 corresponding to the guide post 52 is also an example, and the presence or absence of the escape hole 44 is arbitrary.

  The second restraining means 33 integrally fixes the second upper pressing member 55 to the upper base 25 with bolts (substantially the same as the bolt 35), and is slidable to the lower base 28 via the second cylinders 56 ... The second lower pressing member 57 was attached in the (Z-axis direction).

The second upper pressing member 55 is formed in a substantially rectangular shape with a main body 61 sized to contact the outer peripheral portion 58 set inward and connected to the outermost peripheral portion 31 of the blank material 15. The second upper pressing surface 63 is formed on the main body 61. Forming a hole 66 for fitting the guide post 65 in the upper part facing the second upper pressing surface 63, and forming first elastic member mounting holes 68 ... for fitting one of the elastic members 67 ... An attachment hole 72 for attaching the stopper member 71 is formed, and the second upper pressing surface 63 is set as the restraining position B2 of the second restraining means 33, and the top surface of the blank 15 is pressed.
The mounting shape of the guide post 65 and the hole 66 into which the guide post 65 is fitted are an example. For example, the guide post 65 may be fastened with a bolt without forming the hole 66.

The second upper pressing surface 63 is a surface deeper than the first upper pressing surface 42 by a distance Z1 in the Z-axis direction.
The restraining position B2 of the second restraining means 33 is a position that restrains the position where the double-acting press 17 is further lowered by the stroke S1 (S1 = Z1) with respect to the restraining position B1 of the first restraining means 32. Is.

  The second lower pressing member 57 forms a main body 73 that faces the main body 61 of the second upper pressing member 55 in a substantially rectangular shape, forms a second lower pressing surface 74 on the main body 73, and faces the first lower pressing surface 74. A guide hole 76 is formed in the lower portion of the guide, and a guide post 78 is fitted into the guide hole 76 through a collar 77. The guide post 78 is attached to the lower base 28, and the second cylinder 56 is attached to the lower base 28. The rod of the second cylinder 56 is connected to the lower part and the lower surface of the blank 15 is pressed.

  In the first restraining means 32 (first upper pressing member 34, first lower pressing member 37) and second restraining means 33 (second upper pressing member 55, second lower pressing member 57), the first upper Although the lower pressing members 34 and 37 are formed in a square shape, the rectangular shape is an example, and the shape of the first upper and lower pressing members 34 and 37 is arbitrary, and may be formed in a circular shape. In addition, the second upper and lower pressing members 55 and 57 are formed in a square shape, but the square shape is an example, and it may be formed in a circular shape.

  The upper die 27 is a die placed on top to give a predetermined shape. The die surface 83 is processed at the lower portion of the main body 82, the support portion 85 is formed at the center of the main body 82, and the guide hole is formed in the support portion 85. 87 is opened, the guide post 65 is slidably fitted into the guide hole 87 via the collar 88, and the guide post 65 is integrally fitted in the hole 66 of the second upper pressing member 55, and the second elastic member is attached to the support portion 85. The holes 91... Are formed, the elastic members 67... Are attached to the second elastic member mounting holes 91, the pushback restricting portion 92 is formed in the support portion 85, and the stopper member 71 is passed through the pushback restricting portion 92 through the stopper member 71. The member 71 is attached to the attachment hole 72 of the second upper pressing member 55 with a bolt 93, and an inner contact surface 94 is formed on the upper portion of the main body 82.

The elastic member 67 is, for example, a compression spring, and lifts the upper mold 27 in the Z-axis direction to make it stand by.
The push-back restricting portion 92 stops the mold surface 83 at a distance M with respect to the second upper pressing surface 63 together with the stopper member 71.
The lower mold 29 is a mold disposed below to give a predetermined shape, and a mold surface 95 facing the mold surface 83 is processed.

  Thus, in the drawing apparatus 11, the mold (upper mold) 27 is slidably supported by the second restraining means 33 and the mold (upper mold) 27 is separated from the inner slider 21 of the double-acting press 17. The first and second restraining means 32 and 33 are integrally fixed to the outer slider 22 outside the inner slider 21.

FIG. 2 is a perspective view of a blank material used when drawing with the drawing apparatus of the present invention.
The blank material 15 has a drawing forming region 97 set on a plate material (material), an outer peripheral portion 58 is set outward (in the directions of arrows a1 and a1) continuously with the drawing forming region 97, and is connected continuously with the outer peripheral portion 58. The outer peripheral portion 31 is set, and the outermost peripheral portion 31 is a blank having fitting holes 98.

3A and 3B are views for explaining the operation of the drawing apparatus of the present invention. FIG. 3A shows the operation of the first restraining means 32, and FIG. 3B shows the first restraining means. The state of the blank 15 when restrained by 32 is shown. This will be described with reference to FIGS.
First, the blank material 15 is set in the mold 12 shown in FIG. Specifically, the mold 12 is opened, and the four fitting holes 98... Of the blank material 15 are respectively fitted to the set shafts 47 (see FIG. 3). The blank material 15 is placed on the lower pressing member 57.

  In (a), when the outer slider 22 lowers the first upper pressing member 34 and the second upper pressing member 55 by the operation of the double-action press 17, the first upper pressing member 34 is the outermost peripheral portion of the blank material 15. 31, the first upper pressing surface 42 of the first upper pressing member 34 presses the outermost peripheral portion 31. At this time, the first restraining means 32 (the first upper presser member 34 and the first lower presser member 37) is controlled by the output of the double-acting press 17 and the output of the first cylinder 36. The outermost peripheral portion 31 is restrained at a restraining position B1 of one restraining means 32.

  In (b), the blank material 15 at this time is not supported in the central drawing region 97, and a deflection 101 is generated at the center of the blank material 15. As a result, the blank material 15 having the deflection 101 at the center is formed. The outermost peripheral portion 31 is restrained by the first restraining means 32.

4A and 4B are views for explaining the operation of the drawing apparatus of the present invention (continuation of FIG. 3). FIG. 4A shows the operation of the second restraining means 33, and FIG. Shows the state of the blank 15 when restrained by the second restraining means 33.
In (a), the outer slider 22 continues to resist the output of the first cylinder 36... Side (total) with the outer slider 22 restraining the outermost peripheral portion 31 by the operation of the double-acting press 17. When the stroke is lowered by the stroke S1, the second lower pressing surface 74 of the second lower pressing member 57 is pushed in by the stroke S1, so that the blank material 15 is plastically deformed. At that time, the output on the second cylinders 56... Side (total) is larger than the output of the double-acting press 17, and the second cylinders 56.

In (b), in the process of plastically deforming the blank material 15 by the drawing depth H while pushing in the second lower pressing member 57 while restraining the outermost peripheral portion 31 of the blank material 15, the drawing region 97 and the outer peripheral portion. 58 is pulled in the X-axis direction and the Y-axis direction as indicated by arrows a5..., The deflection 101 (see FIG. 3) generated at the center becomes extremely small until it can be said that there is no deflection. Therefore, it is possible to suppress the deflection generated in the drawing region 97 set at the center of the blank 15 set on the mold 12.
The drawing depth H is a depth that is plastically processed when restraining is performed at the restraining position B2 of the second restraining means 33.

As shown to (a), the blank material 15 is plastically deformed and the outer peripheral part 58 of the blank material 15 is restrained with the 2nd upper press surface 63 of the 2nd upper pressing member 55. FIG. At this time, the second restraining means 33 (the second upper pressing member 55 and the second lower pressing member 57) is controlled by the output of the double-acting press 17 and the output of the second cylinder 56. The outer peripheral portion 58 is restrained at the restraining position B2 of the second restraining means 33.
As described above, since the first and second restraining means 32 and 33 are integrally fixed to the outer slider 22, the second upper pressing member 55 of the second restraining means 33 is independent of the outer slider 22. It can move as a whole without moving in the Z-axis direction, and the variation in the dimensions of the molded product can be reduced.

FIGS. 5A and 5B are diagrams for explaining the operation (continuation of FIG. 4) of the drawing apparatus of the present invention. This will be described with reference to FIG.
In (a), the outer slider 22 continues to act against the output on the second cylinder 56... Side (total), with the outer slider 22 restraining the outer peripheral portion 58 by the operation of the double-acting press 17. If the stroke of the first cylinder 36... (Total) is lowered by the stroke S2, the die surface 95 of the lower die 29 is pushed in, so that the drawing region 97 of the blank 15 is plastically deformed. By descending only by the stroke S2, at the same time, the first lower pressing member 37 and the second lower pressing member 57 both come into contact with the lower base 28 and stop.

In (b), when the outer slider 22 continues to apply the pressing force, the outermost peripheral portion 31 and the outer peripheral portion 58 are integrally restrained by the first restraining means 32 and the second restraining means 33.
Based on the position information of the outer slider 22, the inner slider 21 continues to descend, contacts the inner contact surface 94 of the upper mold 27, and resists the force on the elastic member 67. The upper die 27 is lowered and a pressing force is applied to the drawing region 97 of the blank material 15. As a result, the molded product 104 is obtained by drawing the drawing region 97 into a desired shape using the mold surface 83 of the upper mold 27 and the mold surface 95 of the lower mold 29.

6 (a) and 6 (b) are diagrams for explaining the operation of the drawing apparatus of the present invention (continuation of FIG. 5). This will be described with reference to FIG.
In (a), when the inner slider 21 is raised, the upper die 27 is raised by the force of the elastic member 67... (Total), and when the push-back restricting portion 92 hits the stopper member 71, the upper die 27 is It reaches the upper limit position and enters a standby state.
On the other hand, the outer slider 22 continues to apply a pressing force.

  In (b), when the outer slider 22 continues to rise, the second lower pressing member 57 stops at the upper limit position at the stroke end of the second cylinders 56, and the second restraining means 33 is opened. In this process, the second lower pressing member 57 extrudes the molded product 104 and releases it from the mold surface 95 of the lower mold 29.

On the other hand, at the same time when the second cylinders 56... Advance (the rod rises), the first cylinders 36... Advance (the rod rises), and the first lower press at the stroke end of the first cylinders 36. The member 37 stops at the upper limit position. When the outer slider 22 is further raised, the first restraining means 32 starts to open, so that, for example, the operator takes out the molded product 104.
That is, when the “start button” on the operation panel of the double-acting press 17 is pressed, the operations of FIGS. 1 to 6 are automatically performed. Finally, for example, the operator takes out the molded product 104 and completes one cycle. To do. Returning to FIG. 1, the second cycle is started.

As described above, in the drawing apparatus 11, the blank holder 16 includes the first restraining means 32 that restrains the outermost peripheral portion 31 of the blank material 15 and the second restraint disposed inside the first restraining means 32. The restraining position B1 of the first restraining means 32 is set to a position for holding the blank material 15 in advance of the second restraining means 33 by the lowering of the double-acting press 17, and the second restraining means. The restraint position B2 of 33 is set to a position B2 that restrains the position where the double-acting press 17 is further lowered with respect to the restraint position B1 of the first restraining means 32, and the second restraining means 33 is a die (upper die). 27 is slidably supported (in the Z-axis direction), and the die (upper die) 27 is disposed away from the inner slider 21 of the double-acting press 17 to place the first and second restraining means 32 and 33 on the inner side. Outer outer of the slider 21 It is fixed integrally to the slider 22.
As a result, in the process of restraining the outermost peripheral portion 31 at the restraining position B1 of the first restraining means 32 and reaching the restraining position B2 of the second restraining means 33, the blank material 15 connected to the outermost peripheral portion 31 is centered. A tensile force can be applied to remove the deflection at the center of the blank material 15.

  In addition, since the first and second restraining means 32 and 33 are integrally fixed to the outer slider 22, there is no independent movement between the outer slider 22 and the first and second restraining means 32 and 33. Variations in the dimensions of the molded product can be reduced.

  The second restraining means 33 supports the mold (upper mold) 27 so as to be slidable (in the Z-axis direction) (preventing lowering by the elastic members 67..., Guiding by the guide posts 65), and the mold (upper mold) 27. Since the movable press 17 is disposed away from the inner slider 21, the die (upper die) 27 is operated with reference to the second restraining means 33 without fixing the die (upper die) 27 to the inner slider 21. To do. Therefore, the positional accuracy of the mold (upper mold) 27 can be increased.

Next, another embodiment of the drawing apparatus according to the present invention will be described.
FIG. 7 is a cross-sectional view illustrating another embodiment. The same components as those in the embodiment shown in FIG.
The drawing apparatus 11B according to another embodiment is characterized by including a blank holder 16B.
The drawing apparatus 11B includes a mold 12B (consisting of an upper mold 13B and a lower mold 14B) and a blank holder 16B that is disposed on the mold 12B and holds the blank material 15.

The upper mold 13 </ b> B has an upper mold 27 </ b> B disposed in the opening 26 of the upper base 25.
The lower mold 14B has a lower base 28B attached to the bed 23 of the double-acting press 17.

The blank holder 16B includes a second restraining means 33B arranged inside the first restraining means 32.
The restraining position B1 of the first restraining means 32 is a position for holding the blank material 15 ahead of the second restraining means 33B. Details will be described later.

The second restraining means 33B is characterized in that a second lower pressing member 57B is integrally attached to the lower base 28B.
The restraining position of the second restraining means 33B is Bb2 (see also FIG. 9).
The restraining position Bb2 of the second restraining means 33B is a position that restrains the position where the double-acting press 17 is further lowered by the stroke Sb1 with respect to the restraining position B1 of the first restraining means 32. In other words, the blank material 15 is restrained by being pushed at a position lowered from the restraining position B1 of the first restraining means 32 by the stroke Sb1.

  The second lower pressing member 57B has a main body 73B that faces the main body 61 of the second upper pressing member 55 formed in a substantially rectangular shape, a second lower pressing surface 74 that is formed on the main body 73B, and the second lower pressing surface 74 that faces the second lower pressing surface 74. The lower part to be integrally attached to the lower base 28B holds the lower surface of the blank material 15.

  In the first restraining means 32 (first upper pressing member 34, first lower pressing member 37) and second restraining means 33B (second upper pressing member 55, second lower pressing member 57B), the first upper Although the lower pressing members 34 and 37 are formed in a square shape, the rectangular shape is an example, and the shape of the first upper and lower pressing members 34 and 37 is arbitrary, and may be formed in a circular shape. In addition, the second upper and lower pressing members 55 and 57B are formed in a square shape, but the square shape is an example and can be formed in a circular shape.

The upper mold 27B is a mold disposed on the top to give a predetermined shape, and has a main body 82B.
The elastic member 67 is, for example, a compression spring, and lifts the upper mold 27B in the Z-axis direction to make it stand by.

  Thus, in the drawing apparatus 11B, the mold (upper mold) 27 is slidably supported by the second restraining means 33B, and the mold (upper mold) 27 is separated from the inner slider 21 of the double-action press 17. The first and second restraining means 32 and 33B are integrally fixed to the outer slider 22 outside the inner slider 21.

FIGS. 8A and 8B are views for explaining the operation of another embodiment. FIG. 8A shows the operation of the first restraining means 32, and FIG. 8B shows the first restraining means 32. The state of the blank material 15 when restrained by is shown. This will be described with reference to FIGS.
First, the blank material 15 is set in the mold 12B opened as shown in FIG. As described above, the blank material 15 is placed on the first lower pressing member 37 and the second lower pressing member 57B.

  In (a), when the outer slider 22 lowers the first upper pressing member 34 and the second upper pressing member 55 by the operation of the double-action press 17, the first upper pressing member 34 is the outermost peripheral portion of the blank material 15. 31, the first upper pressing surface 42 of the first upper pressing member 34 presses the outermost peripheral portion 31. At this time, the first restraining means 32 (the first upper presser member 34 and the first lower presser member 37) is controlled by the output of the double-acting press 17 and the output of the first cylinder 36. The outermost peripheral portion 31 is restrained at a restraining position B1 of one restraining means 32.

  In (b), the blank material 15 when the outermost peripheral portion 31 is restrained at the restraining position B1 does not support the center drawing region 97, and a deflection 101 occurs in the center of the blank material 15, resulting in the center. The outermost peripheral portion 31 of the blank 15 in which the deflection 101 is generated is restrained by the first restraining means 32.

FIGS. 9A and 9B are diagrams for explaining the continuation of FIG. 8, in which FIG. 9A shows the operation of the second restraining means 33B, and FIG. 9B is restrained by the second restraining means 33B. The state of the blank material 15 is shown.
In (a), the outer slider 22 continues to resist the output of the first cylinder 36... Side (total) with the outer slider 22 restraining the outermost peripheral portion 31 by the operation of the double-acting press 17. When the stroke is lowered by the stroke Sb1, the first lower pressing member 37 of the first restraining means 32 comes into contact with the lower base 28B and stops.

Further, when the first lower pressing member 37 starts to descend, the outer peripheral portion 58 of the blank material 15 comes into contact with the second lower pressing surface 74 (see FIG. 7) of the second lower pressing member 57B, and the outer peripheral portion 58 and the center are pressed. The drawing forming region 97 is pulled together (see arrow a5 in FIG. 9B). Subsequently, the outer peripheral portion 58 is plastically deformed, the second upper pressing surface 63 (see FIG. 7) of the second upper pressing member 55 abuts on the upper surface of the outer peripheral portion 58, and the upper surface of the outer peripheral portion 58 is pressed. Press the outer periphery 58.
That is, the second restraining means 33B (the second upper pressing member 55 and the second lower pressing member 57B) has an outer peripheral portion at the restraining position Bb2 set at a position where the outer slider 22 of the double-acting press 17 is lowered by the stroke Sb1. 58 is restrained.

In (b), in the process in which the blank material 15 is plastically deformed by the drawing depth Hb while the outermost peripheral portion 31 of the blank material 15 is constrained, the drawing region 97 and the outer peripheral portion 58 are in the X-axis direction and the Y-axis direction. Are bent as indicated by arrows a5..., The deflection 101 (see FIG. 8B) generated at the center becomes extremely small until it can be said that there is no deflection. Therefore, it is possible to suppress the deflection generated in the drawing region 97 set at the center of the blank 15 set in the mold 12B.
The drawing depth Hb is a depth that is plastically processed when restraining is performed at the restraining position Bb2 of the second restraining means 33B.

  As described above, since the first and second restraining means 32 and 33B are integrally fixed to the outer slider 22, the second upper pressing member 55 of the second restraining means 33B is independent of the outer slider 22. It can move as a whole without moving in the Z-axis direction, and the variation in the dimensions of the molded product can be reduced.

FIGS. 10A and 10B are diagrams for explaining the continuation of FIG.
In (a), when the outer slider 22 continues to apply a pressing force, the outermost peripheral portion 31 and the outer peripheral portion 58 are integrally restrained by the first restraining means 32 and the second restraining means 33B.
Based on the position information of the outer slider 22, the inner slider 21 continues to descend, contacts the inner contact surface 94 of the upper mold 27, and resists the force on the elastic member 67. The upper die 27 is lowered and a pressing force is applied to the drawing region 97 of the blank material 15. As a result, the drawn product region 104B is obtained by drawing the drawing region 97 into a desired shape using the mold surface 83 of the upper mold 27 (see FIG. 7) and the mold surface 95 of the lower mold 29 (see FIG. 7). .

In (b), when the inner slider 21 is raised, the upper die 27 is raised by the force of the elastic members 67... (Total), and when the push-back restricting portion 92 hits the stopper member 71, the upper die 27 is It reaches the upper limit position and enters a standby state.
On the other hand, the outer slider 22 continues to apply a pressing force.

FIG. 11 is a diagram for explaining the continuation of FIG.
When the outer slider 22 continues to rise, the rods of the first cylinders 36 advance (rise) synchronously, and the first restraining means 32 (the first upper pressing member 34 and the first lower pressing member). 37) rises in a state where the outermost peripheral portion 31 of the blank material 15 is constrained, separates the blank material 15 from the second lower pressing surface 74 of the second lower pressing member 57B, and the stroke end of the first cylinder 36. Thus, the first lower pressing member 37 is stopped at the upper limit position.

When the outer slider 22 is further raised, the first restraining means 32 starts to open (see FIG. 7), so that, for example, the operator takes out the molded product 104B.
That is, when the “start button” on the operation panel of the double-acting press 17 is pressed, the operations shown in FIGS. 7 to 11 are automatically performed. Finally, for example, the operator takes out the molded product 104B and completes one cycle. To do. Returning to FIG. 7, the second cycle is started.

Thus, in the drawing apparatus 11 </ b> B, the blank holder 16 </ b> B includes the first restraining means 32 that restrains the outermost peripheral portion 31 of the blank material 15 and the second restraint disposed inside the first restraining means 32. The restraint position B1 of the first restraining means 32 is set to a position for holding the blank material 15 prior to the second restraining means 33B by the lowering of the double-acting press 17, and the second restraining means. The restraint position Bb2 of 33B is set to a position Bb2 that restrains the position where the double-acting press 17 is further lowered by the stroke Sb1 with respect to the restraint position B1 of the first restraint means 32, and the second restraint means 33B is mold ( The upper die 27 is slidably supported (in the Z-axis direction), and the die (upper die) 27 is disposed away from the inner slider 21 of the double-acting press 17, and the first and second restraining means 32, 33 It was fixed integrally to the outer slider 22 of the outer side of the inner slider 21.
As a result, the outermost peripheral portion 31 is restrained at the restraining position B1 of the first restraining means 32, and in the process of reaching the restraining position Bb2 of the second restraining means 33B, the blank material 15 connected to the outermost peripheral portion 31 is centered. A tensile force can be applied to remove the deflection at the center of the blank material 15.

  Further, since the first and second restraining means 32 and 33B are integrally fixed to the outer slider 22, there is no independent movement between the outer slider 22 and the first and second restraining means 32 and 33B. Variations in the dimensions of the molded product can be reduced.

  The mold (upper mold) 27 is supported by the second restraining means 33B so as to be slidable (in the Z-axis direction) (preventing lowering by the elastic members 67... And guiding by the guide posts 65) and the mold (upper mold) 27 is duplicated. Since the die (upper die) 27 is arranged away from the inner slider 21 of the dynamic press machine 17, the die (upper die) 27 operates on the basis of the second restraining means 33B without fixing the die (upper die) 27 to the inner slider 21. To do. Therefore, the positional accuracy of the mold (upper mold) 27 can be increased.

  Further, in the drawing apparatus 11B, the second lower pressing member 57B of the second restraining means 33B is fixed to the lower base 28B, so that a configuration for moving the second lower pressing member 57B is not required. Therefore, the structure of the drawing apparatus can be simplified.

  The drawing apparatus of the present invention is suitable for drawing.

Sectional view of the drawing apparatus of the present invention The perspective view of the blank material used when drawing with the drawing apparatus of this invention The figure explaining operation | movement of the drawing apparatus of this invention The figure explaining operation | movement (continuation of FIG. 3) of the drawing apparatus of this invention The figure explaining operation | movement (continuation of FIG. 4) of the drawing apparatus of this invention The figure explaining operation | movement (continuation of FIG. 5) of the drawing apparatus of this invention Sectional drawing explaining another embodiment The figure explaining operation | movement of another embodiment The figure explaining the continuation of FIG. The figure explaining the continuation of FIG. The figure explaining the continuation of FIG. The figure explaining the basic composition of conventional technology

Explanation of symbols

  DESCRIPTION OF SYMBOLS 11, 11B ... Drawing apparatus, 15 ... Blank material, 16, 16B ... Blank holder, 17 ... Double acting press machine, 21 ... Inner slider, 22 ... Outer slider, 27 ... Mold (upper mold), 29 ... Mold (lower) Mold), 31 ... outermost peripheral portion, 32 ... first restraining means, 33, 33B ... second restraining means, B1 ... restraining position of the first restraining means, B2, Bb2 ... restraining position of the second restraining means .

Claims (1)

A drawing apparatus that includes a blank holder that holds a blank material and a mold that is arranged above and below to give a predetermined shape, and performs drawing with the mold,
The blank holder includes a first restraining means for restraining the outermost peripheral portion of the blank material, and a second restraining means disposed inside the first restraining means, and the restraining position of the first restraining means. Is set to a position for holding the blank material prior to the second restraining means by lowering the double-acting press, and the restraining position of the second restraining means is set to the restraining position of the first restraining means. The position where the double-acting press is further lowered is set as a restraining position, the mold is slidably supported by the second restraining means, and the mold is arranged apart from the inner slider of the double-acting press, 1. A drawing apparatus characterized in that the first and second restraining means are integrally fixed to the outer slider on the outer side of the inner slider.

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