JPH0515438Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an elastic recovery correction device, which corrects the elastic recovery of a product during metal plastic working.

[Prior Art] In a press machine, elastic recovery of a product that occurs after press forming is corrected.

The conventional structure of such an elastic recovery correction device includes a mold,
In particular, the upper mold (lower mold or both) itself was supposed to be used.

That is, elastic recovery generally appears as a convex shape in which the edge surface of the upper (lower) surface of the product is low and rises toward the center. Therefore, the shape of the upper mold (lower mold) was preformed so that these raised parts could be canceled out.

[Problems that the invention aims to solve] Therefore, it is not possible to manufacture a mold with a shape that corresponds to the product shape, and it is uneconomical because it requires a lot of trial and error to create a shape that counteracts elastic recovery. It was hot. In addition, if the quantity and quality of the material changes, in extreme cases, the amount of elastic recovery increases or decreases each time the lot changes for the convenience of material management, so there is a problem that pressing cannot be performed with the desired precision even if the same mold is used. Ta.

Furthermore, when the mold is worn out, it is difficult to repair it.

This idea was created in view of these circumstances,
The present invention provides an elastic recovery correction device that can correct elastic recovery by appropriately deforming an upper mold or a lower mold.

[Means for Solving the Problems] The device described in item 1 has a main body that has a hollow portion that opens downward and is attached directly or indirectly to the lower surface of the slide, and a structure that covers the opening on the lower surface of the main body. a holding plate for holding the upper mold attached to the upper die; a contact member made of a piezoelectric element that can come into contact with the upper surface of the holding plate; and a forced external force that causes the contact member to deform the holding plate in a downward convex manner. The compressive force applied to the abutting member can be maintained at a predetermined value or less, and includes a biasing means for exciting and biasing to generate , a piston integral with the abutting member, and a means for biasing the piston downward. The above-mentioned object is achieved by a configuration including a pressurizing means formed by arranging a plurality of pressurizing units including a relief mechanism formed in parallel in the hollow part.

In addition, the invention described in item 2 includes a contact member made of a piezoelectric element that can come into contact with the lower surface of the holding plate, and the contact member is excited to generate a forced external force that deforms the holding plate in an upwardly convex manner. an escape mechanism formed to be able to maintain a compressive force applied to the abutment member at a predetermined value or less, including a biasing means for biasing the abutment member, a piston integral with the abutment member, and a means for biasing the piston upward; and a pressurizing means formed by arranging a plurality of pressurizing units consisting of the following in parallel in the hollow part, to achieve the above object.

[Function] According to the invention described in item 1 with the above configuration, by adjusting the biasing force of the contact member of each pressure unit, the upper mold itself can be elastically restored through downward convex deformation of the holding plate. It can be transformed to the extent that it is worth canceling out. Therefore, the product after pressing has a high degree of precision in which elastic recovery has been corrected.

Further, in the invention described in item 2, the lower mold itself can be deformed to compensate for the elastic recovery.

[Example] Hereinafter, an example of the present invention will be described in detail based on the drawings.

The press machine in this example consists of a crown, column, slide, bolster, base (all not shown), etc., and has a structure in which the slide is raised and lowered by a crankshaft housed in the crown, but the press machine itself is not limited to this. For example, a hydraulic press may be used.

(First Example) This device in this example is mounted on a slide, and in order to ensure effective correction accuracy, the static accuracy of the entire press machine has a high resolution in order to minimize the influence that it has on the dynamic accuracy. Provides a rigid die set,
The die set is indirectly attached to the slide via a movable body forming the die set.

First, we will explain the highly rigid die set.

As shown in FIGS. 5 and 8, the die set is composed of a box-shaped frame 10 and a movable body 30,
The upper mold 6 is attached to the movable body 30 via an elastic recovery correction device, which will be described in detail later, and the lower mold 7 is mounted on a lower plate 16 forming a part of the box-shaped frame 10.

The box-shaped frame body 10 is intended to assemble short and small members with high precision, accurately guide the vertical movement of the movable body 30, and establish accurate relative movement between the upper mold 6 and the lower mold 7. 11, a lower plate 16, a support 21, a column 24, etc.

That is, the upper plate 11 and the lower plate 16 are made of rectangular plates, and as shown in FIG.
They are integrally connected at 21. Each support column 21 is extremely short when viewed from the press machine as a whole, so
This allows for a structure with high precision, high rigidity, and less deformation. In addition, the sliding resistance is small and frictional heat is extremely small.

The lower mold 7 is fixed to the lower plate 16, and the lower plate 16 itself is mounted and fixed on a bolster (not shown).

Furthermore, in this embodiment, in order to further increase the rigidity, the three sides are each reinforced with columns 24, and a connecting plate 27 is provided across the front side at an intermediate position in the height direction.

As shown in FIG. 6, the column 24 is provided with a hole 25 for convenience of entry and exit of the material (product) W. In order to further reduce the bending deformation of each support 21 that slides and guides the movable body 30, each support 21 has an arc-shaped sliding piece 28 as shown in FIG.
It is supported by each column 24 via. The supporting position is the middle portion of the support column 21. 26 is a block for convenience of assembly. Further, a through hole 12 is provided in the center portion of the upper plate 11.

Next, the movable body 30 supports the upper die 6 and moves the upper die 6 up and down in synchronization with the slide 4 .

That is, in order to accurately achieve relative movement between the upper mold 6 and the lower mold 7 with respect to the highly rigid and highly accurate box-shaped frame 10, the upper mold 6 is moved along its supports 24, so to speak. be.

This movable body 30 has a rectangular hollow part 37 that opens downward, and its upper part 35 is connected to the upper plate 1.
It is attached to the slide lower surface 5 through the through hole 12 of No. 1. Further, an upper mold 6 is attached to the ceiling side of the hollow portion 37 at a position facing the lower mold 7 fixed to the lower plate 16.

In this embodiment, the lower surface 7 is the apparent ceiling of the retaining plate 70 forming part of the elastic recovery compensator.
It is attached to 2.

The movable body 30 also has a pair of bearings 39, 39 disposed at a relatively large interval in the longitudinal direction of the support column 21 in order to ensure the above-mentioned relative movement.
It is slidably guided to each support column 21 via. In order to increase the interval, the movable body 30
1 and a skirt portion 32, both 31,
32 are fixed together with long bolts 33, 33. The skirt portion 32 is made of material (product) W.
A hole 34 for entry and exit is provided. Slide 4
In Fig. 6, which shows the state where is near the bottom dead center,
When the slide 4 is raised to the top dead center, the movable body 30
It is understood that the holes 34 in the column 24 and the holes 25 in the column 24 are at the same height.

Further, the upper part 35 of the movable body 30 is fixed to the lower surface 5 of the slide 4 through the through hole 12. Specifically, the die height (in this embodiment, the lower surface 72 of the holding plate 70 and the upper surface 1 of the lower plate 16)
7) is attached to the lower surface 5 via a height adjustment mechanism 41 for adjustment.

This height adjustment mechanism 41 includes an upper flange 42 fixed to the lower surface 5, a lower flange 46 fixed to the upper part 35 of the base part 31 forming the movable body 30, both flange 42, 46, and a screw 43 coupled to a turnbuckle. The rotating shaft 44 forms a rotating shaft 44. A pin hole is provided in the protrusion 45 of the rotating shaft 44.

Note that after adjustment, the rotating shaft 44 is locked by a fixing device (not shown).

Now, as shown in FIGS. 1, 2, and 4, the elastic recovery correction device of the first embodiment has a main body 6.
0, a holding plate 70 and a pressurizing means 80. In this example, die set 1
While utilizing the high accuracy and high rigidity of 0.30, the so-called elastic recovery of the product W is automatically corrected more accurately.

This elastic recovery correction device has a novel structure in which the upper die 6 is shaped in advance so as to cancel out the amount of elastic recovery, but in which a forced external force is applied to the upper die 6 to cause it to deform downward in a convex manner. It is something.

That is, the main body 60 is fixed to the movable body 30 via the main shaft 49 as shown in FIG. A spacer 68 and a tapered piece 69) are used to form a constant angle with the inner surface of the movable body 30.
Have a pause. It is housed in a predetermined position in the hollow portion 37 of the movable body 30 and is movable up and down together with the movable body 30. In this manner, in this embodiment, the main body 60 is indirectly attached to the slide.

The close member 66 rotates the bolt 67 to move the taper piece 69 up and down, thereby expanding and contracting the spacer 68 in the radial direction.

Here, as shown in FIGS. 1 and 2, the pressurizing means 80 includes a contact member 82 that can come into contact with the upper surface 71 of the holding plate 70, which will be described later, and a pressing member 82 that urges the contact member 82 to press the holding plate 70. A plurality of pressurizing units 81, each consisting of a biasing means 83 that applies a forced external force to convexly deform the holding plate 70 downward, and an escape mechanism 92 that maintains the compressive force applied to the abutment member 82 below a predetermined value, are installed in a hollow space. They are arranged in parallel within the section 61.

In this embodiment, each contact member 82 is formed from a piezoelectric element, focusing on a piezoelectric element that has excellent linearity and a large tensile force. Therefore, the energizing means 83 is powered by a power source 83 that excites and energizes the energizing means 83.
becomes.

In addition, in consideration of arranging only a plurality of abutting members 82 in parallel and the economic efficiency of piezoelectric elements, an escape mechanism 92 is provided for each abutting member 82 to protect each abutting member 82 when excessive compressive force is applied. is provided.

The escape mechanism 92 includes a cylinder 94 formed by a partition 85 that conveniently partitions the hollow part 61, a piston 95 that can slide inside the cylinder 94, and the cylinder 9.
In a normal state, the contact member (piezoelectric element) 82 integrally attached to the piston 95 is biased to be able to come into contact with the upper surface 71 of the holding plate 70. , contact member 82
When excessive input is applied from the biasing means (power supply) 83 to the biasing means (power supply), large pressure is locally transmitted from the holding plate 70 side, or variations in biasing force between the contact members 82 occur, the contact members The piston 95 is formed to perform an escape movement so that an excessive compressive force is not applied to the piston 82.

Note that a gap C is provided between the partition 85 and the holding plate 70, so that when large pressure is applied from the holding plate 70 side (such as upward deformation in FIG. 1), the pressure is received by the bottom surface of the partition 85. It is formed in such a way that it can be Therefore, the escape mechanism 9
The relief stroke in step 2 can be made smaller.

On the other hand, the holding plate 70 has an opening 6 in the main body 60.
2 is disposed on its lower surface 63 so as to close it. Specifically, it is attached via a spherical bearing 74 as shown in FIG. This is to smooth the downward convex deformation of the holding plate 70 by operating the pressurizing means 80.

The spherical bearing 74 consists of a convex member 75 and a concave member 76 having an arcuate surface, and is attached to a headed pin member 64 implanted in the main body 60 so as to protrude from the lower surface 63. Although the number of spherical bearings 74 is selected to be an appropriate number, in this embodiment, 16 spherical bearings are provided as shown in FIG. 65 is bushu.

Therefore, the contact member 8 of each pressure unit 81
By biasing the holding plate 70 and displacing it downward, surface pressure can be applied and the holding plate 70 can be bent and deformed to project downward. This convex shape is adjusted so that the upper mold 6, which is fixed to the lower surface 72 of the holding plate 70 so as to be deformable as the holding plate 70 deforms, is sufficient to cancel out the amount of elastic recovery of the product.

Further, the plurality of pin members 64 and each spherical bearing 74 attached to each pin member 64 are connected to the holding plate 7.
The pin member 64
Mechanical deformation and damage to etc. can be prevented.

That is, by controlling the power source that forms the urging means 83 for each contact member 82, each contact member 8
By changing the amount of extension (contact pressure) of 2, the holding plate 70 is deformed, and with this deformation, the upper die 6 fixed to the holding plate 70 is deformed sufficiently to compensate for elastic recovery. .

Note that each power source can be variably adjusted by a control device (not shown).

Next, the action will be explained.

The height adjustment mechanism 41 performs so-called die height adjustment. The slide 4 is moved up and down intermittently between the bottom dead center and the top dead center shown in FIG. 6 by a crankshaft housed in a crown (not shown). In this case, the movable body 30 holding the upper mold 6 is slidably guided by the box-shaped frame 10 assembled with high precision and high rigidity, and the lower mold 7 is fixed to the lower plate 16, so that
The relative movement of both molds 6 and 7, that is, pressing with high dynamic precision can be performed.

Therefore, even if the rigidity of the press machine side is relatively low, high-precision pressing can be achieved with this high-rigidity die set.

The material W passes through the hole 25 of the column 24 and the hole 34 of the movable body 30, and is automatically supplied to and discharged from the lower die 7.

Now, the characteristic operation of the present invention is to deform the upper mold 6 so as to cancel the amount of elastic recovery determined by the material, shape, etc. of the material W.

That is, by appropriately adjusting the strength of the power source 83, which is a biasing means for each pressure unit 81, using a control device (not shown), the amount of extension of each contact member 82 changes, and surface pressure is applied to the corresponding contact portion of the holding plate 70. . As a result, the holding plate 70 is deformed in a downwardly convex manner.

Note that when an excessive compressive force is applied to a certain abutting member 82, the escape mechanism 92 is activated to protect that abutting member 82.

This deflection curve can be selected based on the absolute value of the amount of extension of each contact member 82 and the combination thereof.

For example, by increasing the amount of expansion of the central member and decreasing the amount of expansion of the peripheral portion, the central portion of the holding plate 70 can be significantly deformed downward, and the periphery can be deformed to be steeply inclined. Thereby, the upper die 6 can be deformed to correct elastic recovery.

According to the first embodiment, the elastic recovery correction device is configured to deform the upper mold 6 fixed to the holding plate 70, so that the shape of the upper mold 6 can be adjusted in advance to produce the product. There is no need to make it different from the shape, and the elastic recovery can be corrected as appropriate. This correction can be made for any amount at any time by adjusting the pressure means 80, so even if there is a change in the material of the material W or wear of the upper die 6, the correction can be made immediately and with high precision. Can produce products.

Furthermore, since the holding plate 70 is attached to the lower surface 63 of the main body 60 via a plurality of spherical bearings 74, accurate and smooth deformation is promoted without causing excessive distortion, and the pin member 64, etc. It does not cause any damage.

Further, the elastic recovery correction device has a simple and robust structure consisting of the main body 60, the holding plate 70, and the pressurizing means 80, and has wide adaptability. Moreover, since each contact member 82 is formed from a piezoelectric element, it has high linearity and can electrically control the amount of expansion accurately and steplessly.

Furthermore, since the upper die 6 is configured to deform as the holding plate 70 deforms, deformation commensurate with a continuous and gradual elastic recovery curve can be generated without applying a local concentrated load to the upper die 6. be able to.

Furthermore, a highly precise and highly rigid box-shaped frame body 10 is formed from the upper plate 11, lower plate 16, and support column 21, and a movable body 30 that holds the upper die 6 is slidably guided by this box-shaped frame body 10. Since the die set is configured, pressing can be performed with high dynamic accuracy without being affected by the static accuracy of the press machine, or with only a slight influence. Also from this point of view, the elastic recovery correction characteristics can be improved.

In the above first embodiment, the pressurizing means 80 is formed to include a plurality of abutting members 82, but the number and shape of the abutting members 82 can be arbitrarily selected.

Further, although the relief mechanism 92 is of a spring type, other structures may be used. For example, as shown in FIG. It is possible to apply a constant pressure of oil pressure from the oil passage 97 that is provided.

Furthermore, although the main body 60 is attached to the slide 4 indirectly via the movable body 30 forming the highly rigid box-shaped frame 10, it can also be attached directly to the slide 4. However, by cooperating with the box-shaped frame 10, sufficient preliminary conditions (for example, accurate movement) for elastic recovery correction can be more easily established.

(Second example) A second embodiment is shown in FIG.

That is, while the first embodiment is configured to deform the upper die 6 itself, the second embodiment is configured to deform the lower die 7 itself.

In FIG. 7, the main body 60 forming the elastic recovery correction device is attached to the upper surface 9 of the bolster 8,
A holding plate 70 is attached to the upper surface 79 of the main body 60 via 16 spherical bearings 74, and the lower mold 7 is fixed to the upper surface 71 of the holding plate 70.

In other words, the main body 60 is attached to the bolster 8.
This is a configuration in which the external appearance is changed and the vertical direction is reversed from that of the first embodiment.

Therefore, regarding the pressurizing means 80, etc., the first
Since this is the same as in the embodiment, the explanation will be omitted.

According to the second embodiment, the elastic recovery of the product can be corrected by deforming the lower mold 7 in a vertically convex manner, similar to the case where the upper mold 6 of the first embodiment is deformed. It has a great effect.

Note that the first embodiment and the second embodiment can also be implemented in the same press machine.

[Effects of the invention] As is clear from the above explanation, the present invention has a configuration in which the upper mold or the lower mold can be deformed via the holding plate by adjusting the plurality of pressurizing units forming the pressurizing means. Therefore, there is no need to make any changes to the upper or lower mold in advance, and corrections can be made automatically and quickly and accurately at any time, regardless of changes in the amount of elastic recovery based on the material, etc. It has a good effect.

[Brief explanation of the drawing]

The figures show an embodiment of the elastic recovery correction device according to the present invention, FIGS. 1 to 6 show the first embodiment, FIG. 1 is a partially omitted side sectional view, and FIG. Fig. 3 is a plan view showing the parallel arrangement of the pressurizing units.
The figure is a side sectional view showing another embodiment corresponding to Fig. 1, Fig. 4 is a view showing the state in which the main body and the holding plate are attached, and Fig. 5 is a cross-sectional view of a part of the die set to which this device is attached. FIG. 6 is a sectional view taken along the arrow line - in FIG. 5, and FIG. 7 is a schematic diagram showing the second embodiment. 4...Slide, 5...Bottom surface of slide, 6...
...upper mold, 7 ... lower mold, 8 ... bolster, 9 ... upper surface of bolster, 10 ... box-shaped frame body, 21 ... column, 30 ... movable body, 60 ... forming elastic recovery correction device main body, 61... hollow part, 62... opening, 63... lower surface, 64... pin member, 70...
Holding plate, 71...upper surface, 72...lower surface, 7
4...Spherical bearing, 79...Top surface of main body, 80...
Pressure means, 81...pressure unit, 82...abutting member formed from a piezoelectric element, 83...power source as urging means, 92...escape mechanism.

Claims (1)

[Claims for Utility Model Registration] (1) A main body that has a hollow part that opens downward and is attached directly or indirectly to the lower surface of the slide, and an upper mold that is attached to the lower surface of the main body so as to close the opening. a holding plate for holding the holding plate, a contacting member made of a piezoelectric element that can come into contact with the upper surface of the holding plate, and an exciting member that is excited to generate a forced external force that convexly deforms the holding plate downward. and an escape mechanism that includes a piston integral with the abutting member and a means for urging the piston downward, and is formed to be able to maintain the compressive force applied to the abutting member at a predetermined value or less. A pressurizing means formed by arranging a plurality of pressurizing units in parallel in the hollow part, an elastic recovery correction device comprising: (2) A main body that has a hollow part that opens upward and is attached to the upper surface of the bolster, a holding plate for holding the lower mold that is attached to the upper surface of the main body so as to close the opening, and a lower surface of the holding plate. a contact member made of a piezoelectric element that can come into contact with the contact member; a biasing means that excites and biases the contact member to generate a forced external force that causes the holding plate to convexly deform the holding plate; A plurality of pressurizing units each consisting of a piston and an escape mechanism including means for urging the piston upward and capable of keeping the compressive force applied to the abutting member below a predetermined value are arranged in parallel in the hollow part. An elastic recovery correction device comprising: a pressurizing means arranged and formed;