JPH0890100A - Turret punch press for forming plural curved surfaces - Google Patents

Abstract

PURPOSE: To form a three-dimensional curved surface on both of a plate and a sheet and to reduce the number of punches by having plural numbers of punch grooves that the punch interval of adjoining punches are different. CONSTITUTION: A plural curved surfaces forming turret punch press is composed by attaching an upper frame 8 attached with an upper punch 1 groove, an upper side plate 3, each upper punch 1, and a cylinder 10 driving each upper punch 1 installed as one body and a lower frame 7 attached with a lower punch 2 groove, each lower punch 2 and a stopper 5 installed as one body and movable up and down onto supporting columns 6 in a prescribed interval. In this case, the arrangement of the upper punch 1 groove and the lower punch 2 groove is, for example, that the outer circumference punch interval P is made as P=2L, the punch interval of the central part of each punch groove is made more narrow than the outer circumferential part, these are made as P=L and arranged regularly, and the upper punch 1 groove and the lower punch 2 groove are opposed mutually and the arrangement is made the same. Therefore, this can be used on both of the plate and the sheet, and the number of upper and lower punches can be reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-point curved multi-point press for press-forming a large-sized blank into an arbitrary three-dimensional curved surface using a large number of punches. The present invention relates to a multi-point press for compound curved surface molding which can be used for molding both thin plates and is suitable for reducing the number of upper and lower punches and reducing the equipment cost.

[0002]

2. Description of the Related Art In recent heavy electric equipment, large ships, etc., three-dimensionally shaped products are used which are molded from a large thick plate material having sides of several meters. On the other hand, for outer panels of automobiles, railway vehicles, etc., three-dimensional shaped articles formed from a thin plate material with each side of several tens of cm are used.

Of the above, three-dimensional molding of large-sized thick plate materials having a plate thickness of 10 mm or more, which are various types of small-quantity products whose lengths are several meters on each side, require a mold manufacturing period when a total mold is used. However, there has been a problem in that a large-sized plate material of such various small-quantity products is sequentially pressure-formed using a large press and a partial mold. ing. However, this work requires the experience and intuition of a skilled person and, at the same time, requires a large number of partial molds according to the purpose and requires a long time for molding, which is a factor of increasing the product cost.

On the other hand, three-dimensional molding of a thin plate material having a thickness of less than 10 mm and having a side of several tens of centimeters, which is used as an outer panel of an automobile, a railway vehicle, or the like, has defects such as wrinkles when using a full die. Since it occurs, it requires the experience and intuition of a skilled person, and at the same time, molding methods such as overhang molding using a wrinkle retainer and opposed hydraulic molding have been performed.

In the case of the large-sized thick plate material, a large number of punches whose height can be adjusted are installed at regular intervals at positions corresponding to the curved surfaces of the upper mold and the lower mold of the general mold. A method of forming a press die corresponding to a required bending shape, that is, a multi-point punch die by adjusting the height has been implemented (for example, JP-A-1-95829).
However, in the case of this method, there is a problem in operability such as difficulty in supporting the material or controlling in-process with respect to springback or the like.

Further, as a method of using the punches arranged at a large number of fixed intervals, a method of setting only the upper die punch group to a double curved surface shape and the lower die punch group being driven by a hydraulic piston is also implemented. Has been done. In this case, for example,
"Study on automation of hull skin bending work by universal multi-point press method (1st report), Journal of Japan Society of Shipbuilding No. 132, pp. 481-501 (Sho 47-10)", "Same (2nd report) , Shipbuilding Society of Japan, No. 133, pp. 291-
Pp. 305 (Sho 48-7) ".
When the same number of punches are arranged vertically and horizontally, for example, “Development of Sanjo Press, Mitsubishi Heavy Industries Technical Report Vol. 13, No. 6, 6”
In some cases, only three columns are arranged, as described in "Pages 4 to 72 (1976-11)".

Documents related to this type of apparatus are Japanese Patent Laid-Open Nos. 56-154223 and 60-1.
74222 publication etc. are mentioned.

[0008]

However, in any of the above-mentioned conventional methods, each side exceeds several meters,
Moreover, since the bending apparatus is for a thick plate material having a plate thickness of more than 10 mm, when a thin plate having a plate thickness of about several mm is formed by using the same device, the plate surface is formed between punches. Since there is no constraint on the compressive stress inside the plate, there is a problem that the plate buckles and the forming limit is greatly reduced. Then, this problem has been a factor of restriction on the size of the molded product and a decrease in accuracy.

The present invention has been made in view of the above problems of the prior art.
Multi-point press for compound curved surface molding that can be used for forming both thick plates with a plate thickness of over 10 mm and thin plates with a plate thickness of about several mm, and can reduce the number of vertical punches to reduce equipment costs. The purpose is to provide.

[0010]

In order to achieve the above object, the present invention provides a means for adjusting the height of a large number of punch groups arranged on both upper and lower sides of a blank, at least for one group of punches. In a multi-point press for forming a compound curved surface, which is provided with a frame to which a punch group is attached, at least two punch groups having different punch intervals between adjacent punches are provided.

It is preferable that different punch intervals of the punch groups are arranged roughly in the punch groups in the outer peripheral portion and densely in the punch group in the central portion with respect to the punch group in the outer peripheral portion.

Further, different punch intervals of the punch groups may be arranged such that the punch groups in the outer peripheral portion are densely arranged and the punch groups in the central portion are roughly arranged in the punch group in the outer peripheral portion. Good.

Further, different punch intervals of the punch groups may be arranged such that the punch groups at the corners are densely arranged and the punch groups other than the corners are arranged more coarsely than the punch groups at the corners. Good.

Further, the punch groups having different punch intervals may be arranged in a staggered manner.

Further, according to the present invention, a large number of punch groups arranged on both upper and lower sides of the base plate, at least a punch group on one side is provided with means for adjusting the height, and further, it is composed of a frame to which the punch groups are attached. A multi-point press for forming a multi-curved surface is configured to have at least two types of punch groups having different cross-sectional areas.

Further, according to the present invention, a large number of punch groups arranged on the upper and lower both sides of the blank are provided with means for adjusting the height of the punch groups on the upper and lower sides, and further, a frame to which the punch groups are attached is constituted. A multi-point press for forming a compound curved surface is configured to have punch groups with different punch arrangements on the upper surface side and the lower surface side.

Further, according to the present invention, a large number of punch groups arranged on both upper and lower sides of the blank are provided with means for adjusting the height of at least one punch group, and further, a frame for attaching the punch groups is constituted. In the multi-point press for forming a compound curved surface, the punch interval between adjacent punches can be changed in a similar manner.

Further, according to the present invention, a large number of punch groups arranged on the upper and lower surfaces of the blank are provided with means for adjusting the height of at least one punch group, and further, the punch groups are attached to the frame. In the multi-curve press for forming multiple curved surfaces, the upper and lower punch groups are arranged in a grid pattern on the frame, and the upper and lower punch groups and the upper and lower frames to which the punch groups are attached are arranged in a grid pattern side by side punch group. One group is divided into at least three or more adjacent groups, and an odd-numbered group and an even-numbered group of the divided plural groups can be relatively moved by 1/2 of the punch interval. And the punch arrangement between the three groups can be changed from a grid pattern to a zigzag pattern by the relative movement.

[0019]

By virtue of the above-mentioned structure, only the interval of a part of the punch group necessary for forming the thin plate material is narrowed, while the other part of the punch group is arranged with a wide interval capable of forming the thick plate material. Therefore, it becomes possible to change the punch interval depending on the location. Therefore, the molding of the three-dimensional curved surfaces of both the thick plate material and the thin plate material becomes possible with one device. Moreover, it is generally considered that the size of the thin plate material to be processed is smaller than the size of the thick plate, and by narrowing only the interval between the punch groups of a part necessary for forming the thin plate material, In both cases, molding can be performed with the minimum necessary punch group, and the equipment cost can be reduced.

Since it is possible to partially change the punch spacing in each punch group and to arrange punches having different cross-sectional areas while changing the punch spacing, a large number of adjacent punches are mutually adjacent. Since the part that is in contact with the mold and at the same time is likely to cause buckling in the molded product can be arranged with a closer punch interval than other parts, buckling of the molded product is suppressed and the minimum required punch is used. The compound curved surface can be molded with high precision.

By arranging punches having different cross-sectional areas by changing the punch intervals, a large number of adjacent punches contact each other, and the punches, which are particularly likely to bend, are supported by the peripheral punches. The bending of the punch can be reduced as a whole.

Further, by having a punch group having different punch arrangements on the upper surface side and the lower surface side, the number of punches can be reduced.

Furthermore, the number of punches can be reduced by adopting a device structure in which the punch intervals of adjacent punches can be changed.

[0024]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a plan view showing the arrangement of a lower punch of a multi-point press for forming a multi-curved surface, and FIG. 2 is II- of FIG.
A II cross-sectional view shows the basic configuration of the present embodiment. FIG. 3 is a diagram showing a state in which a blank plate is set, FIG. 4 is a diagram showing a state in which each punch has reached a final stroke, FIG. 5 is a diagram showing an example of a twist-formed product to be processed, and FIG. FIG. 7 is a plan view showing a configuration example of a lower punch arrangement, FIG. 7 is a modification of FIG. 1, and shows a configuration in which a lower punch group having a close spacing is arranged at one corner, and FIG. 8 is another conventionally known lower punch. FIG. 9 is a plan view showing a configuration example of arrangement.
Is a diagram showing an example of a twisted molded product of a thick plate, FIG. 10 is an explanatory view of a conventional twisted molded product in a molding order, and FIG. 11 is a drawing of a twisted molded product according to the present invention.

In FIGS. 1 and 2, 1 is a plurality of hydraulically driven upper punches, and 2 is a plurality of hydraulically driven lower punches, both of which have the same circular cross section. Reference numeral 3 is a square-shaped upper plate, and 4 is a square-shaped lower plate, which makes contact with the outer surface of each of the lower punches 2 arranged on the outermost periphery and can suppress the outward displacement of each of the lower punches 2. It is composed of a frame having a predetermined height. Reference numeral 5 is a stopper provided in a pair with each lower punch 2 and movable in the vertical direction. Reference numeral 6 is a cylinder 10 provided in a pair with the upper punch 1 group, the upper plate 3 and each upper punch 1 to drive each upper punch 1. Upper frame with attached 8
And a lower frame 7 to which the lower punch 2 group, the lower side plate 4 and the respective stoppers 5 are attached are maintained at predetermined intervals.

The arrangement of the upper punch 1 group and the lower punch 2 group is as shown in FIG.
Is set to P = 2L, and the center of each punch group is regularly arranged with P = L, with the punch interval being narrower than the outer peripheral portion, and the upper punch 1 group and the lower punch 2 group are made to face each other. They have the same arrangement. In this case, the number of punches is 17 in each of the upper and lower punch groups, and a total of 34 punches are arranged in both.

The stopper 5 determines the final stroke of each lower punch 2, and the lower plate 4 is provided such that its inner surface contacts the outer peripheral surface of the outermost lower punch 2, and The outward bending of the punch 2 is suppressed. Then, by increasing the height of the lower side plate 4, each upper punch 1 at the outermost periphery of the upper punch group during plate forming.
However, it can be inserted into the lower side plate 4 in a state where there is almost no gap between the outer peripheral surface of each of the upper punches 1. Therefore, the upper side plate 3 has a role of reinforcing the lower side plate 4 from being opened outward.

Next, the molding operation of this embodiment will be described with reference to FIGS. First, as shown in FIG. 3, each stopper 5 is adjusted according to the preset final stroke of each lower punch 2, and all lower punches 2 are raised so that a blank plate is provided on each lower punch 2. Place 9. Next, with the stroke of each upper punch 1 being the shortest, the upper frame 8 is lowered to the position where the tip of each upper punch 1 contacts the base plate 9, and fixed at that position. Then, from this state, pressure oil having a higher pressure than the lower punch 2 group side is injected into each cylinder 10 of the upper punch 1 group, and the upper punch 1 group is lowered. The lower punch 2 group is pushed down by this lowering, and when the lower punches 2 reach the stroke positions of the adjusted stoppers 5, respectively, as shown in FIG. 4, the lowering stops and the entire blank 9 becomes a predetermined shape. Molded.

Next, with reference to FIGS. 5 and 6, regarding the relationship between the two types of twist-formed products 11 and 12 of different sizes having a compound curved surface as processing targets and the punch arrangements shown in FIGS. And explain. 5 (a), (b)
FIG. 6 is a diagram showing an example of a twist-formed product to be processed, and FIG. 6 is a plan view showing a configuration example of a conventionally known lower punch arrangement. In the figure, the same symbols as those in FIG. 1 indicate the same components.

The twist-formed product 11 having the larger surface area shown in FIG. 5A is a square having a side length of 4 L and a plate thickness of 2.
T. On the other hand, the twist-formed product 12 having a smaller surface area shown in FIG. 5B has a square shape having a side length of 2 L and a plate thickness T. Both have similar shapes, and the material is stainless steel.

First, the twist molded product 11 shown in FIG.
1 and 2, the blank 9 having a side length of 4 L is set as shown in FIG. 3 and the maximum processing force per upper punch 1 is first determined. Value, for example, 5 tons, and the lower punch 2 is also set to 4 tons. Here, in the region of 4L × 4L of the entire apparatus, which is an area required for forming the twist-formed product 11, the punch interval is P = 2L so that the blank plate 9 can be formed without buckling. The punch group is arranged on the outer peripheral portion. Therefore, during molding, each lower punch 2 is moved to its respective position and the molding is completed in a state in which buckling due to compression in the plane of the blank 9 is suppressed.

Next, the twist molded product 12 shown in FIG. 5 (b).
Similarly, a case of molding with the configuration shown in FIGS. 1 and 2 will be described. In the configuration with a limited number of punches as shown in FIG. 1, the number of punches required to contact the twisted molded product 11 or the twisted molded product 12 shown in FIG. However, 9 pieces are required in the upper and lower 3 × 3 matrix. At this time, since the twist molded product 11 and the twist molded product 12 have similar shapes to each other, the twist molded product 12 having half the length of the twist molded product 11 is obtained.
The punch interval that can be formed without buckling is P = L. Therefore, the twist-formed product 1 having a side length of 2 L
In order to mold 2 with the configuration shown in FIGS. 1 and 2, in the area of the punch group having a punch interval of P = L in the central portion of 2L × 2L, the plate thickness T is 1L and the length of one side is 2L. By arranging the base plate, it is possible to sufficiently prevent buckling due to compression in the plane of the base plate during molding.

In this case, an example of a conventionally known punch arrangement shown in FIG. 6, that is, the punches are arranged on the entire surface of the apparatus at a constant punch interval P = L, and a thick plate is formed in a region of 4L × 4L of the entire punch group. Compared with the case where both the twist-formed product 11 (plate thickness 2T) and the thin twist-formed product 12 (plate thickness T) are made moldable, it is possible to reduce the number of punches by 8 each in the upper and lower directions. As a result, the equipment cost can be reduced.

In the punch arrangement shown in FIG. 1, the punch interval P = L is used for forming the twist-formed product 12 of thin plate.
The punch group of No. 1 is arranged in the central portion. In this punch arrangement, the load is applied to the device in a better balance during molding as compared with the example shown in FIG. It has an advantage that it can be prevented from scattering.

FIG. 7 shows a modification of the first embodiment.
The present embodiment is an example in which a punch group having a punch interval of P = L is arranged at an end so as to be close to one corner. In this case, although the load is unbalanced as compared with the case of FIG. 1, there is an advantage that the deformed state of the molded product can be easily observed during molding. Further, the number of punches to be arranged has an effect that the number of punches to be arranged may be smaller by 3 each than in the case of FIG.

FIG. 8 shows a conventionally known punch arrangement constructed so that only the twist-formed product 11 of a thick plate having a plate thickness of 2T shown in FIG. 5 can be formed. = 2L, a thin-plate molded product such as the twist-molded product 12 having a plate thickness T has a small number of constraint points and buckling due to in-plane compression occurs, so that molding is impossible.

In the case where the conventional apparatus shown in FIG. 8 is used to form a twist-formed product 14 having a plate thickness of 2T and a side length of 2 L shown in FIG. From the relationship of the minimum required number of punches for forming the product, first, as shown in FIG. 10, a twist-formed product 15 having a side length of 4L is formed using a blank plate 9 having an area of 4L × 4L. , After the molding, unnecessary peripheral parts are cut to have a side length of 2
The twisted molded product 14 of L will be formed. Therefore, even in the case of the twisted molded product 14 of a thick plate, almost three-fourths of the twisted molded product 15 are wasted, the material cost becomes expensive, and the number of punches contacting the twisted molded product 14 at the time of molding is increased. However, since various deformations occur due to the release of internal stress during cutting, it is difficult to obtain the required molding accuracy after molding, and there are various problems.

However, when the twist molded product 14 is molded by using the punch-arranged device shown in FIGS. 1 and 2, the blank 9 having an area of 4L × 4L before molding as shown in FIG. 2L required to mold twist molded product 14 from
After cutting into a blank plate 16 having a dimension of × 2L, the blank plate 16 can be formed into a desired shape by setting the blank plate 16 in a region where the punch interval of the punch group in the central portion is P = L. Therefore, it is possible to eliminate the waste of the material that is molded with the configuration shown in FIG. 8, and the number of punches that come into contact with the twist-molded product 14 at the time of molding increases, and it is not necessary to estimate the amount of deformation at the time of cutting. It becomes possible to secure desired molding accuracy.

All of the above embodiments are cases in which the molding apparatus includes the upper plate 3 and the lower plate 4. However, in order to have such a device structure, it is a condition that the blank 9 to be molded as shown in FIG. 3 has a size that can be inserted into the lower plate 4. For this reason, in this forming apparatus, when a long raw plate having a side length of more than 10 meters, such as an outer plate of a hull, is partially formed while being fed in the horizontal direction, the upper plate 3 And the lower plate 4 hinders the feeding of the blank.

However, when the radius of curvature of the product to be molded is large, there is little bending of the punch toward the outside, so that the accuracy of molding is not affected. Therefore,
In this case, the apparatus structure without the upper plate 3 and the lower plate 4 makes it possible to perform molding while feeding a long raw plate.

Next, a second embodiment of the present invention will be described with reference to FIG. FIG. 12 shows a configuration example in the case of molding a shape other than the twist-molded product as shown in FIG. 5, for example, a bowl-shaped molded product. Unlike FIG. 1 and FIG. 7, the punches are arranged in a staggered pattern. There is. In the figure, the same symbols as those in FIG. 1 indicate the same components.

When the bowl-shaped shaped article is molded, it is preferable that the punches are arranged in a staggered pattern for molding. 12
(A) is an example thereof, in which the punch arrangement is made in a zigzag manner, the punch group in the outermost peripheral portion has a punch interval P = 2L, and the punch group in the central portion has a punch interval P = L. However, conventionally, in a bowl-shaped molded product, a large amount of strain is concentrated in the peripheral portion of the molded product during molding, so that wrinkles due to buckling are likely to occur.

FIG. 12B shows an example of the structure for suppressing the above-mentioned wrinkles. In this example, the punch interval P of the punch group at the outermost peripheral portion is set in order to suppress wrinkles that occur in the peripheral portion of the molded product.
= L, and the interval between punches in the central punch group is P = 2L
And According to this punch arrangement, punch groups arranged at close intervals play a role of pressing wrinkles against wrinkles generated on the outer peripheral portion of the molded product, and suppress the generation of wrinkles generated on the peripheral portion of the molded product. You can

Next, a third embodiment of the present invention will be described with reference to FIGS. 13 and 14. FIG. 13 is a diagram showing an example of two types of twist molded products having a maximum inclination angle of 30 °, and FIG. 14 is a diagram showing a configuration example for suppressing bending due to lateral load of the punch. In the figure, the same symbols as those in FIG. 1 indicate the same components.

In FIG. 13, the twist-formed product 17 having the larger surface area is a square having a side length of 6 L and a plate thickness of 2
It is T '. On the other hand, the smaller twist-formed product 18 is a square having a side length of 3 L and a plate thickness T '. Both have similar shapes, and the material is stainless steel. Conventionally, a lateral load is applied to a punch during molding of such a twist-molded product by shifting the contact point between the punch and the molded product from the center axis of the punch. The lateral load increases as the molding progresses, and the final lateral load increases as the maximum tilt angle of the molded product increases. Therefore, the punch is bent due to the lateral load, the positioning accuracy of the punch is deteriorated, and the precision of the molded product is deteriorated.

FIG. 14 shows an example of the arrangement of punches in the case where the bending of the punch due to the lateral load is suppressed and both the twist molded product 17 and the twist molded product 18 can be molded. In this example, in the 6L × 6L region of the entire apparatus, which is the area required for forming the twisted molded product 17, a punch having a diameter D = 2L that can be formed without buckling the twisted molded product 17 as a punch interval. 20, Punch interval P
= 2 L, and arranged on the outer peripheral portion. Also, the twist molded product 17
Since the twist-formed product 18 and the twist-formed product 18 have similar shapes to each other, the punch interval which can be formed without buckling of the twist-formed product 18 having a length half that of the twist-formed product 17 is P = L. Therefore, from the relationship of the minimum number of punches required for forming the above-mentioned multi-curved surface molded product, the area of 3L × 3L in the central portion, which is the area required for molding the twisted molded product 18, has a diameter D≈L. The punches 21 of No. 1 were arranged at the interval P = L between the punches.

In the case of this punch arrangement, as in the configuration example of the conventionally known punch arrangement, the punch 21 is arranged on the entire surface of the apparatus at a constant punch interval P = L, and both the twist molded product 17 and the twist molded product 18 are formed. The number of punches is significantly reduced as compared with the case where the mold is made moldable, resulting in a lower equipment cost. That is, the present embodiment has the same effects as the above-described first embodiment of the present invention. Therefore, further in this embodiment, the adjacent punches 2
The punches 20 and 21 have different cross-sectional areas so that the punches 0 and 21 can contact each other, and the punch 20 at the outermost peripheral portion is provided on the outer side.
Therefore, it becomes possible to suppress the outward bending due to the lateral load. As a result, the positioning accuracy of the punch in the apparatus is improved, and the accuracy of the molded product is easily secured.

Next, a fourth embodiment of the present invention will be described with reference to FIGS. FIG. 15 is a diagram showing a configuration example for suppressing bending due to lateral load of the punch, and FIG. 16 is FIG.
It is a figure which shows the example which changed the punch cross-section into the polygon in the modification of No. 5. In the figure, the same symbols as those in FIG. 14 indicate the same items.

FIG. 15 shows a configuration in which two types of punch groups having different cross-sectional areas are arranged as in FIG.
Compared with FIG. 14 in which the punch 20 is arranged only on the outermost periphery and the punch 21 is arranged inside the punch 20, the punch 20 is arranged in the entire area of the lower plate 4 and the gap between the punches 20 has a small diameter. The punch 22 is arranged.
Specifically, the punch 2 having a diameter D = 2L is formed in the entire lower plate 4.
0s are arranged at a punch interval P = 2L so that adjacent punches 20 can contact each other.
Punch 2 with a diameter D = aL (a = proportional constant) in the space between 0
2 is placed such that its outer circumference is in contact with the surrounding punch 20. According to this punch arrangement, compared with the conventional punch arrangement shown in FIG. 6, the contact points between each punch and the molded product can be increased, and the precision of the molded product can be improved. Here, for example, when the proportional constant a = 0.83, the punches 22 having the diameter D = aL can be brought into contact with four adjacent punches 20.

FIG. 16 shows a configuration in which two types of punch groups having different cross-sectional areas are arranged as in FIG.
The cross-sectional shape of the punch 23 is an octagonal cross-section with respect to the circular cross-section of the punch 20 of FIG. on the other hand,
In this case, the punch cross section having a small diameter corresponding to the punch 22 of FIG. 15 is the punch 24 having an octagonal cross section as shown. Of course, the punch 23 may have another polygonal cross section.

As described in each of the first to fourth embodiments, the number of punch groups having different punch intervals, diameters, cross-sectional shapes and the like can be arbitrarily set to set the number of punch groups. And, it becomes possible to exert a unique effect in the arrangement.

In the stroke adjustment of each punch in each of the embodiments described above, the stroke of each lower punch is adjusted by the stopper 5 and each upper punch is pushed off, but a high degree of precision of the molded product is required. In this case, a position control mechanism such as a servo mechanism using hydraulic pressure or a motor may be provided on each of the upper and lower punches. However, in this case, since the cost is high due to its configuration, reducing the number of punches is more effective in reducing the equipment cost.

Next, a fifth embodiment of the present invention in which a stop position control mechanism is provided in the upper punch group will be described with reference to FIGS. 17 and 18. 17A is a plan view showing the arrangement of the upper punch, FIG. 17B is a plan view showing the arrangement of the lower punch, and FIG. 18 is a sectional view taken along line XVIII-XVIII of FIGS. 17A and 17B. . In the figure, the same reference numerals as those in FIG. 1, FIG. 2 and FIG. 5 indicate the same or the same functions.

In FIG. 17 (a), 19 is a plurality of upper punches provided with a stop position control mechanism (not shown) for each punch, and each punch 19 is not arranged all over the upper plate 3, but as shown in the figure. The top, bottom, left and right are asymmetrically arranged regularly. On the other hand, as shown in FIG. 17 (b), the lower punch 2 group is at a position opposite to the upper punch 19 group, that is, only the lower punches 2 a in the lower punch 2 group, which are shaded, are opposed to the upper punch 19. Lower punch 2 so that the others are not relative
They are regularly arranged symmetrically around a '. The stroke of each lower punch 2 is the stopper 5 as in FIG.
The final stop position can be determined by the control by.

In this embodiment having a different arrangement configuration of the upper punch 19 group and the lower punch 2 group, when the twist-formed product 11 shown in FIG. 5 is formed, the forming shape is limited according to the punch arrangement. However, since the stop position control mechanism is provided in each of the upper and lower punch groups, molding can be performed easily and accurately. According to this punch arrangement, since the number of punches can be significantly reduced, the equipment cost can be reduced. In addition to the punch arrangement, the upper punch 19 group and the lower punch 2 group have a punch interval,
The number and cross-section area may be different from each other.

Next, a sixth embodiment of the present invention will be described with reference to FIG. 19A is a plan view showing the arrangement of the upper punch, and FIG. 19B is a plan view showing the arrangement of the lower punch. In the figure, the same symbols as those in FIG. 17 indicate the same components.

FIG. 19 shows an example of the structure for molding a bowl-shaped molded product. Unlike the case of FIG. 17, the punches are arranged in a staggered pattern. In FIG. 19A, the upper punch 19
Are not arranged all over the hexagonal upper plate 25, but are arranged only in the central portion as shown. On the other hand, lower punch 2
The group is arranged only on the outer peripheral portion as shown in FIG. Therefore, in this configuration example, all the upper punches 19 are not relative to the lower punch 2. The stroke of each lower punch 2 is the same as in FIG.
The final stop position can be determined by the control by.

In this punch arrangement, when a bowl-shaped molded product is to be molded, the upper and lower punch groups can be provided with respective stop position control mechanisms. At the same time, since the number of punches arranged vertically can be significantly reduced, the facility cost can be reduced. The upper punch 19 group and the lower punch 2 group may be different from each other in the number of punches, diameter, etc., in addition to the punch arrangement.

Next, a seventh embodiment of the present invention will be described with reference to FIGS. In this embodiment, a stop position control mechanism is provided for the upper and lower punch groups, and a mechanism for changing the distance between adjacent punches is provided.
20 is a plan view showing the arrangement of the lower punch of a multi-point press for forming a multi-curved surface, FIG. 21 is a sectional view taken along the line XXI-XXI of FIG. 20, showing the basic configuration of this embodiment, and FIG. FIG. 23 is a perspective view showing the mounting structure, FIG. 23 is a view showing a state in which the mounting position of the lower punch shown in FIG. 20 is changed, and FIG.
FIG. 25 is a sectional view taken along line XXIV-XXIV of FIG. 3, and FIG. 25 is a view showing a state in which each punch shown in FIG. 21 has reached the final stroke.

20, 21, and 22, 27 is a plurality of lower punches and 28 is a plurality of upper punches, each having the same circular cross section. Reference numerals 29, 30 and 41 denote punch fixing plates for fixing the lower punch 27 and the upper punch 28, and each of the punch fixing plates is provided with a plurality of holes for inserting punches which can fix the positions of the punches. ing. Reference numeral 31 is a screw shaft which is screwed into each punch fixing plate, and each of the punch fixing plates 29 and 30 can be moved up and down by rotating. 32 is a screw shaft 31
An actuator which is connected to one end side of the shaft and rotates the screw shaft 31, and 33 is a plurality of upright guides for supporting the punch fixing plates 29 and 30. A dolly 34 is integrally fixed to the base ends of the punch fixing plates 29 and 30, respectively, and is slidable with the guide 33. Reference numeral 35 denotes a bearing fixed to each guide 33, and each bearing 35 supports the other end side of the screw shaft 30. 36 is a plurality of guides 33
The upper frame for fixing and supporting the upper end side of the guide 37 is a lower frame for fixing and supporting the lower end side of the plurality of guides 33.

As shown in FIGS. 20 and 21, the lower punch 27 group and the upper punch 28 group are arranged regularly in a grid pattern with an interval P = L between adjacent punches. The 27 group and the upper punch 28 group are made to face each other and have the same arrangement. In this case, the number of punches is 9 in each of the upper and lower punch groups from the relationship of the minimum number of punches required for molding the above-mentioned double-curved surface molded article, and a total of 18 punches are arranged.

As shown in FIG. 22, the punch fixing plate 29 is provided with punch insertion holes which can be fixed by changing the positions of the lower punch 27 and the upper punch 28 at intervals P = L. Further, as shown in FIG. 20, the punch fixing plate 30 is also provided with holes for punch insertion that can be fixed by changing the positions of the lower punch 27 and the upper punch 28 at intervals P = √2L. There is. Therefore, the hole positions for fixing the lower punch 27 and the upper punch 28 are changed to change the punch fixing plate 2
By fixing the punches 9 and 30, as shown in FIGS. 23 and 24, the intervals between the adjacent punches of the lower punch 27 group and the upper punch 28 group are enlarged in a grid pattern similar to P = 2L. It can be arranged regularly.

Next, the molding operation of this embodiment will be described with reference to FIGS. 21 and 25. The vertical movement of each of the lower punch 27 and the upper punch 28 in the present embodiment to a predetermined stop position sends a command of the number of rotations for rotating the screw shaft 31 from an unillustrated central control mechanism to the actuator 32, and the actuator 32 commands the same. This is performed by rotating the screw shaft 31 by the number of rotations thus set.

First, the lower punch 2 is rotated by rotating the screw shaft 31.
The level of the top of the seventh group is set to a preset height, and the base plate 38 is placed on the lower punch 27 group. Next, upper punch 2
The group 8 is moved down to a position where it contacts the placed plate 38. Next, as shown in FIG. 25, the lower punch 27 and the upper punch 28 are moved to predetermined strokes, respectively, and the entire blank 38 is formed into a predetermined shape.

Next, the punch structure shown in FIGS. 20 and 21 and FIGS. 23 and 24 and the processing target shown in FIG.
Two types of twist-molded products 1 of different sizes shown in (b)
The relationship with the case of molding 1 and 12 will be described. When forming the twist-formed product 11 having a side length of 4L and a plate thickness of 2T shown in FIG. 5A, the positions of fixing the upper punch 28 and the lower punch 27 to the punch fixing plates 29, 30 are fixed. The interval P = L between adjacent punches shown in FIGS.
23 and 24, the spacing is set to P = 2L by enlarging the state in a similar manner. Pitch between punches at this time P =
Since 2L is a punch interval that allows the blank plate 38 to be molded without buckling as in the case of FIG. 1, buckling due to compression in the plane of the blank plate 38 is suppressed during molding. In that state, the upper punch 28 and the lower punch 27 move to a predetermined stroke to complete the molding.

Next, in the case of forming the twist-formed product 12 shown in FIG. 5 (b) having a side length of 2 L and a plate thickness T, as described above, the twist-formed product 12 is formed without buckling. The possible punch intervals may be P = L. Therefore, FIG.
As shown in 0 and 21, the interval between adjacent punches is P =
By fixing each of the lower punch 27 and the upper punch 28 to the punch fixing plates 29 and 30 so as to be L, in the plane of the blank plate 38 as in the twist-formed product 11 shown in FIG. Molding can be performed in a state in which buckling due to compression is suppressed.

In this case, it is possible to reduce the number of punches by 8 in each of the upper and lower sides, that is, 16 in total, as compared with the configuration example of the punch arrangement in the first embodiment of the present invention shown in FIGS. As a result, the equipment cost can be further reduced.

In the seventh embodiment, the punch stroke position adjusting mechanism is provided in both the lower punch 27 and the upper punch 28, but it may be provided in only one of them.

Next, an eighth embodiment of the present invention will be described with reference to FIG. FIG. 26 is a modified example of FIG. 20 showing the arrangement of the lower punches of the multi-point press for forming a multi-curved surface, and is a view showing an example in which the bowl-shaped molded product is easily molded. 26 (a) is a view corresponding to FIG. 20 and FIG. 26 (b) is FIG. 26 (a).
It is a figure which shows the state which changed the punch arrangement shown in FIG. In the figure, the same reference numerals as those in FIG. 20 indicate the same or the same functions.

In FIG. 26A, the lower frame 37
3 of 37a, 37b, and 37c so that three of the nine lower punches 27 arranged side by side form one group.
Divide into one group. Specifically, the lower frame 37a
The punch fixing plates 29a, 30a, 40a and the screw shafts, actuators, guides and the like attached thereto are arranged on the upper side, and the punch fixing plates 29b, 41 and the screw shafts, actuators, guides and the like attached thereto are arranged on the lower frame 37b. , Punch fixing plates 29c, 30 on the lower frame 37c
c, 40c and screw shafts attached to them, actuators,
Guides etc. are arranged. Of the three divided lower frames, the lower frame 37b is ½ of the punch interval in the lateral direction (horizontal direction) in the figure independently of the lower frames 37a and 37c as shown in FIG. , That is, 1 /
It is configured to be relatively movable by 2L. Further, the punch fixing plates 29a, 40a, 29c, 40c and the screw shafts, actuators, guides and the like attached thereto rotate integrally at a predetermined angle around the lower punch 27 fixed to each punch fixing plate. It is movable. On the other hand, the upper frame 36 (not shown) also corresponds to the lower frame 37 by 36a,
It is divided into 36b and 36c, and the upper frame 36
b is movable similarly to the lower frame 37b, and the punch fixing plates 29a, 40a, 29c, 40c.
The screw shafts, actuators, guides, and the like attached thereto can also be integrally rotated about the upper punch 28. In this case, the punch fixing plate 40a,
The hole 40c is provided with two holes for punch fixing at intervals P = L and P = √2L so as to accommodate bowl-shaped articles having different areas.

Next, the case of molding a bowl-shaped shaped product as a processing target will be described. When molding the bowl-shaped molded product, it is desirable to arrange the punches in a zigzag manner as described above. Therefore, as shown in FIG. 26 (b), the lower frame 37b at the center and the upper frame 36b not shown are ,
Move 0.5R to the right in the figure. Then, along with this movement, the punch fixing plates 29a, 40a, 29c, 40c
And the screw shafts, actuators, guides, etc. attached thereto are rotated about the upper and lower punches 28, 27, respectively.
On the extension of the center line m of each punch fixing plate, the centers of the lower punches 27p located at the center are aligned,
The overall punch arrangement is changed from the grid pattern shown in FIG. 26 (a) to the zigzag pattern. However, in this case, the staggered punch arrangement is configured by excluding the punch fixing plates 30a and 30c and the screw shafts, actuators, guides and the like attached thereto.

With this structure, it becomes easy to mold the bowl-shaped shaped product as in the case shown in FIG. Furthermore, by changing the fixed position of the punch and expanding the punch interval from the illustrated position, it becomes possible to mold bowl-shaped shaped articles of different sizes.

In the embodiment shown in FIG. 26, the upper and lower punch groups and the upper and lower frames to which the punch groups are attached are divided into three groups.
The present invention is not limited to this. For example, when the molded product is large and the number of punches is large, it is divided into a plurality of groups such as 4 groups and 5 groups which are adjacent to each other. Even if the odd-numbered groups and the even-numbered groups are configured to be relatively movable by 1/2 L, the same operation / effect can be obtained.

As described above, also in this embodiment, it is possible to cope with not only the twisted shape but also the bowl-shaped molding with the same apparatus configuration, and at the same time, the punch interval can be changed, which is necessary for the molding. The number of punches can be reduced, and as a result, the equipment cost can be reduced.

[0075]

As described above, according to the present invention, since the punch interval is changed depending on the location, the plate thickness 1
A three-dimensional curved surface can be formed for both a thick plate having a thickness of 0 mm or more and a thin plate having a thickness of several mm. At the same time, since the number of punches arranged vertically can be reduced, the equipment cost can be reduced.

Further, by changing the cross-sectional area of the punches depending on the location and changing the punch interval, it becomes possible to support the adjacent punches with each other, and the bending of the punches at the time of molding is minimized. This can be prevented as much as possible and the molding accuracy can be improved.

Further, by disposing the upper punch group and the lower punch group in different punch arrangements, the number of punches to be arranged can be reduced, and the equipment cost can be reduced.

Furthermore, by adopting a device configuration in which the interval between adjacent punches can be changed, the number of punches can be similarly reduced and the equipment cost can be reduced.

[Brief description of drawings]

FIG. 1 is a plan view showing an arrangement of a lower punch of a multi-point curved multi-point press according to a first embodiment of the present invention.

FIG. 2 is a sectional view taken along line II-II of FIG.

FIG. 3 is a diagram showing a state in which a blank is set in FIG.

FIG. 4 is a diagram showing a state in which each punch shown in FIG. 3 has reached a final stroke.

FIG. 5 is a diagram showing an example of a twist-formed product to be processed.

FIG. 6 is a plan view showing a configuration example of a conventionally known lower punch arrangement.

FIG. 7 is a diagram showing a modified example of the first exemplary embodiment of the present invention, in which a lower punch group having a close interval is arranged at one corner.

FIG. 8 is a plan view showing another configuration example of a conventionally known lower punch arrangement.

FIG. 9 is a perspective view showing an example of a twisted product of a thick plate.

FIG. 10 is an explanatory diagram of the order of forming a conventional twist-formed product.

FIG. 11 is a drawing explaining the order of forming the twist-formed product according to the present invention.

FIG. 12 is a plan view showing an arrangement of lower punches of a multi-point press for double-curved surface molding according to the second embodiment of the present invention, which is an example of molding a bowl-shaped molded product.

FIG. 13 is a diagram showing two types of twist molded products.

FIG. 14 is a plan view showing an arrangement of lower punches of a multi-point press for compound curved surface forming according to a third embodiment of the present invention.

FIG. 15 is a plan view showing an arrangement of lower punches of a multi-point press for compound curved surface forming according to a fourth embodiment of the present invention.

FIG. 16 is a diagram showing an example in which the punch cross-sectional shape is octagonal in the modification example of FIG. 15;

FIG. 17 is a plan view showing an arrangement of upper punches and lower punches of a multi-point press for compound curved surface forming according to a fifth embodiment of the present invention.

FIG. 18 is a cross-sectional view taken along the line XVIII-XVIII of FIGS.

FIG. 19 is a plan view showing the arrangement of an upper punch and a lower punch of a multi-curved surface pressing multi-point press according to a sixth embodiment of the present invention.

FIG. 20 is a plan view showing an arrangement of lower punches of a multi-point press for compound curved surface forming according to a seventh embodiment of the present invention.

21 is a cross-sectional view taken along the line XXI-XXI of FIG. 20.

FIG. 22 is a perspective view showing a mounting structure of a lower punch.

23 is a diagram showing a state in which the attachment position of the lower punch shown in FIG. 20 is changed.

24 is a sectional view taken along line XXIV-XXIV of FIG. 23.

FIG. 25 is a view showing a state where each punch shown in FIG. 21 has reached a final stroke.

FIG. 26 is a modification of FIG. 20 showing the arrangement of the lower punch of the multi-point press for forming a multi-curved surface according to the eighth embodiment of the present invention.

[Explanation of symbols]

1 ... Upper punch, 2 ... Lower punch, 3 ... Upper plate, 4 ... Lower plate, 5 ... Stopper, 6 ... Posts, 7,37 ... Lower frame, 8,36 ... Upper frame, 9,13,16,38 ... Base plate, 10 ... Cylinder, 11, 12, 14, 15, 17,
18 ... Torsional molded product, 19 ... Upper punch (with position control mechanism), 20 ... Lower punch (diameter D = 2L), 21 ... Lower punch (diameter D≈L), 22 ... Lower punch (diameter D = aL),
23, 24 ... Lower punch (octagonal cross section), 25 ... Hexagonal upper plate, 26 ... Hexagonal lower plate, 27 ... Lower punch (with attachment position adjusting mechanism), 28 ... Upper punch (attachment position adjustment) 29, 30, 40, 41 ... Punch fixing plate, 31 ... Screw shaft, 32 ... Actuator, 33 ...
Guide, 34 ... Bogie, 35 ... Bearing, 37a, 37b, 3
7c ... Divided lower frame.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Takashi Sugawara 3-1-1, Saiwaicho, Hitachi, Ibaraki Hitachi Ltd. Hitachi factory (72) Inventor Kenichiro Ishimori 3-chome, Saiwaicho, Hitachi, Ibaraki No. 1 Hitachi Ltd. Hitachi factory

Claims (9)

[Claims] 1. A compound curved surface molding comprising a large number of punch groups arranged on both upper and lower sides of a base plate, at least one punch group having height adjusting means, and a frame to which the punch groups are attached. A multi-point press for multi-curved surface molding, comprising at least two types of punch groups having different punch intervals between adjacent punches. 2. Punch groups having different punch intervals are arranged such that among the punch groups, the punch groups in the outer peripheral portion are arranged roughly, and the punch groups in the central portion are arranged more densely than the punch group in the outer peripheral portion. 1. A multi-point press for forming a compound curved surface according to 1. 3. The punch groups having different punch intervals are arranged such that the punch groups in the outer peripheral portion are densely arranged in the punch group and the punch groups in the central portion are coarser than the punch group in the outermost peripheral portion. Item 1. A multi-point press for forming a compound curved surface according to item 1. 4. Punch groups having different punch intervals are arranged such that the punch groups at the corners are densely arranged and the punch groups other than the corners are arranged more coarsely than the punch groups at the corners. Item 1. A multi-point press for forming a compound curved surface according to item 1. 5. The multi-point press for forming a multi-curved surface according to claim 1, wherein the punch groups having different punch intervals are arranged in a zigzag pattern. 6. A multi-curved surface molding comprising a large number of punch groups arranged on both upper and lower sides of a blank plate, at least one punch group having height adjusting means, and a frame to which the punch groups are attached. A multi-point press for multi-curved surface molding, comprising at least two punch groups having different cross-sectional areas. 7. A multi-curved surface molding comprising a large number of punch groups arranged on both upper and lower sides of a blank, a means for adjusting the height is provided on the punch groups on the upper and lower sides, and a frame to which the punch groups are attached. A multi-point press for multi-curved surface molding, wherein the multi-point press for forming a multi-curved surface has punch groups having different punch arrangements on the upper surface side and the lower surface side. 8. A plurality of punch groups arranged on both upper and lower sides of a blank, at least one punch group having means for adjusting the height, and further comprising a frame to which the punch groups are attached. In the multi-point press for curved surface forming, the punch interval between adjacent punches can be changed in a similar manner, and the multi-point press for double curved surface forming. 9. A plurality of punch groups arranged on both upper and lower sides of a blank plate, at least one punch group having means for adjusting the height, and further comprising a frame to which the punch groups are attached. In the curved surface forming multi-point press, upper and lower punch groups are arranged in a grid pattern on the frame, and the upper and lower punch groups and the upper and lower frames to which the punch groups are attached are grouped one by one in a grid pattern side-by-side punch group. Is divided into a plurality of adjacent groups of at least three groups or more, and the odd-numbered group and the even-numbered group of the divided plurality of groups are relatively movable by ½ of the punch interval, A multi-point press for compound curved surface forming, wherein the punch arrangement between the groups can be changed from a grid pattern to a zigzag pattern by the relative movement.