JP2003245718A - Method for bending material to be processed - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for bending a material to be processed capable of permitting high-precision bending without plate thickness variations and without receiving the influence of a preceeding process and also capable of allowing the simplification of measurement. <P>SOLUTION: The method for bending the material to be processed is characterized in that the material to be processed 1 is bent by mounting the material to be processed 1 on a die 6 having a V groove 61 and by pressing a bending punch 5 to the material to be processed 1. After, a plurality of guide recesses 3 which position and guide the tip end of the bending punch 5 are separated in a prescribed position on the bending baseline 2 of the material to be processed 1, bending is performed by making the material to be processed 1 abut to the inner surface of the V groove 61 of the die 6 by pressing the bending punch 5 after engaging a plurality of guides 55 arranged at the tip end of the bending punch 5 with the guide recesses 3. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for bending a flexible work material such as a metal plate. More specifically, the bending work is performed at a predetermined position according to a guide recess formed in advance. It is about the method.

[0002]

2. Description of the Related Art FIG. 12 shows a conventional method for bending a work piece made of a plate material such as a metal plate. That is, the workpiece 100 that has been cut into a predetermined shape in advance.
Is placed on the die 102, and one end face of the workpiece 100 is brought into contact with the end face of the abutting portion 104 arranged on one side of the die 102. Then, the bending punch 101 is lowered from above the workpiece 100 to form the V formed on the die 102.
The material 100 is pressed until it is joined to the inner surface of the groove 103. Through such a process, the workpiece 100 becomes the V groove 1
Bending is performed at an angle θb corresponding to 03.

At this time, the bending reference line for bending the workpiece 100 is determined by the distance A from the end face of the contact portion 104 to the center of the V groove 103 formed in the die 102. Therefore, by bending and pressing the tip of the punch 101 on the bending reference line of the workpiece 100 determined by the distance A, the workpiece 100 is bent with a predetermined dimension.

[0004]

In the conventional bending method described above, as shown in FIG. 13, in order to obtain a predetermined finished dimension H0, generally, the center line 100a of the workpiece 100 in the plate thickness t0 direction is used. Is defined as a bending reference line, and is defined by a distance A between the bending reference line and one end surface of the workpiece 100. Therefore, when performing bending, the dimension from the bending reference line to the contact portion 104 is set to the distance A in advance, and one end surface of the workpiece 100 is brought into contact with the contact portion 104 to bend. I have decided the position.

However, in the normal case, the workpiece 10
0 has a large variation in the plate thickness, and as shown by the chain double-dashed line in FIG. 13, when the plate thickness becomes t1 which is larger than a predetermined value, the center line of the workpiece 100 in the plate thickness t1 direction. 100
By changing b, the bending reference line changes by the dimension l. From this state, one end surface of the workpiece 100 is contacted with the contact portion 1
When the bending process is performed by abutting against 04, the finished dimension H1 increases in accordance with the amount of change of the bending reference line, and as a result, the finished dimension H1 is different from the desired finished dimension H0, and is treated as a defective product. .

As a countermeasure against this, the work material 100 is used each time.
It was necessary to perform bending by measuring the plate thickness of No. 2 and calculating a bending reference line suitable for the plate thickness, and then correcting the distance A from the bending reference line to the contact portion 104. As a result, productivity is remarkably impaired, which is a factor of cost increase. Further, in the usual case, since the work material 100 is formed by punching, the surface accuracy of the cut surface is low. Therefore, the cut surface is abutted with the contact portion 10.
4 is brought into contact with No. 4 and the above-mentioned distance A changes, resulting in variations in the finished dimension, and since it is different from the desired finished dimension H0, it is treated as a defective product and loses its value as a product. Become.

Further, when the workpiece 100 is cut by a laser, the cutting is performed by melting, so that the workpiece 100 is warped due to the influence of heat, or the cut surface is bent with respect to the bending reference line. May be curved. Therefore, if the bending process is performed with such a cut surface as a reference, the desired finished dimension H0 cannot be obtained.

On the other hand, when bending the work material 100, the side surface of the work material 100 which has already been bent is brought into contact with the contact portion 10.
The bending position may be determined by abutting on No. 4. However, if an error has already occurred in the finished dimension H0 as described above,
Since there is an error in the position of the bending reference line, there is a problem that further accumulated dimensional error occurs.

As described above, a dimensional error occurs due to variations in plate thickness and surface accuracy of the cut surface, and therefore a quality inspection process is required to measure the size of a product subjected to bending and select a non-defective product. . As a result, there is a problem that the manufacturing cost inevitably increases due to the number of inspection steps in addition to the generation of defective products. Furthermore, when bending the workpiece 100, it is necessary to check the front and back of the workpiece 100 itself.
Normally, the edges of the cut surface are confirmed on the front and back sides of the work material 100, but it may be difficult to distinguish the front and back sides, and it is easy for the operator to be careless. There was also a human problem that caused it.

In view of the above situation, the present invention is intended to provide a bending method capable of performing highly accurate bending without being affected by variations in plate thickness and the influence of the previous process and simplifying measurement. To do.

[0011]

In order to achieve the above object, the method for bending a work material according to claim 1 of the present invention is to place the work material on a die having a V groove, and
A method of bending a work material by pressing a bending punch against the work material, comprising a plurality of positioning guides of the tip of the punch at a predetermined position on a bending reference line for bending the work material. The guide recesses are formed separately from each other, and the guide recesses are engaged with a plurality of guide parts provided at the tip of the bending punch, and then the workpiece is pressed on the inner surface of the V groove of the die by pressing the bending punch. The feature is that they are brought into contact with each other to perform bending.

According to the invention described in claim 1, since the guide concave portion for positioning and guiding the tip portion of the bending punch is formed on the bending reference line with which the bending punch abuts, it is not affected by the plate thickness or the previous process. Bending can be performed with high accuracy. As a result, the dimensional error of the product is significantly reduced, so that the measurement such as inspection can be simplified.

The invention according to claim 2 of the present invention is
The guide recess is characterized in that it is formed in a taper shape in which the width is narrowed from one surface of the material to be processed toward the other surface, and an intersection point where the taper is extended is aligned with the bending reference line.

According to the second aspect of the present invention, since the intersection of the taper is aligned with the bending reference line, the position of the bending punch is accurately set on the bending reference line. It can be carried out.

Further, in the invention according to claim 3 of the present invention, the guide portion provided at the tip of the bending punch always projects from the tip of the bending punch, and after engaging with the guide recess, the bending punch. It is characterized in that it is configured so as to retreat when the tip of the abuts against the workpiece.

According to the third aspect of the invention, since the guide portion accurately determines the position of the bending punch at the beginning and retracts it during bending, bending can be performed without being affected by the guide. .

The invention according to claim 4 of the present invention is
The guide punch or the bending punch has at least two guide concave portion forming blocks and guide portion forming blocks, and a space adjusting block is connected between these blocks to position the guide concave portion and the guide portion. It is characterized by matching.

According to the invention as set forth in claim 4, since the gap adjusting block is connected between the guide recess forming block and each functional block of the guide forming block, the size of the work piece or the guide recess is formed. It is possible to appropriately set the position of.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a perspective view showing an embodiment of a method for bending a work piece according to the present invention. Workpiece 1
Is made of a flexible plate material such as a metal plate.
It is cut into a predetermined shape by various cutting methods such as laser cutting, punching with a press, wire cutting, or etching. Reference numeral 2 indicates a bending reference line, and the bending punch 5 is pressed by pressing the bending punch 5 after the tip of the bending punch 5 described later is brought into contact with the bending reference line 2 so as to match. The bending reference line 2 is shown for the sake of convenience, but it is not shown in the actual workpiece 1.

Further, on both ends of each bending reference line 2 in FIG. 1, guide recesses 3 having a predetermined length for positioning the positions of the bending punches 5 are formed at two positions respectively. The guide recess 3 is formed in a rectangular shape as shown in the drawing, and the length thereof can be appropriately set depending on the size of the workpiece 1. That is, the size may be any size required to determine the position of the bending punch 5 described later, and preferably about 1 mm to 10 mm is sufficient. Further, the guide recess 3 is formed in a V-groove shape, and the angle formed by the taper surface formed on the inner surface is 90 degrees in the present embodiment. The intersection point where the tapered surfaces on both sides intersect is aligned with the perpendicular of the bending reference line 2. The angle of the guide recess 3 may be set appropriately.

The guide recess 3 can be formed at any position of the bending reference line 2, but in order to improve the linearity accuracy when the bending punch 5 is brought into contact with the bending reference line 2, each bending reference line is formed. It is desirable to form them at least two positions on 2 as far apart as possible. At this time, if a hole is previously formed in the bending reference line 2, the guide recess 3 may be formed at another position on the bending reference line 2 while avoiding the hole.
The guide recesses 3 are not limited to two locations, but may be further increased depending on the size of the workpiece 1.

The guide recess 3 is formed by a guide punch body 4 as shown in FIG. The guide punch body 4 includes a pair of guide recess forming blocks 40, 40 formed at both ends, and an adjusting block 41 provided therebetween.
It consists of Both blocks 40 and 41 are integrally fixed by a clamp provided on a movable part of a press machine (not shown). Further, if necessary, as shown in FIG. 3, they may be integrally connected by bolts 43, for example.

Further, a V-shaped guide forming punch 40a is formed at the tip of the guide recess forming block 40, and a tapered surface 42 formed on the punch 40a.
The angle formed by 42 is set to 90 ° which is similar to the guide recess 3. Then, the guide recess forming block 4
The width of the punches 40a of 0 and 40 is 1 m, which is the same as the guide concave portion
It is set to about m to 10 mm. The tips of the guide recess forming blocks 40, 40 are formed in a cylindrical shape with a small radius in order to reduce the load during pressing. In the guide punch body 4, the two guide recess forming punches 40, 40 are not limited to being provided at both ends, but the guide recess forming punches 40, 40 may be provided.
It is also possible to sandwich both ends of the adjustment block 41. Further, one guide punch 40 may be used to form the guide recesses 3 at two locations.

When the guide recess 3 is formed, the ridgeline at the tip of the guide punch 4 is aligned with the bending reference line 2 and is pressed by an appropriate pressure. As a result, the guide recess 3 is formed on the one surface of the workpiece 1 along the bending reference line 2. At this time, depending on the case, a semi-cylindrical protrusion is formed on the other surface of the workpiece 1.

The shape of the guide recess 3 described above is not particularly limited, and can be changed to the shape shown in FIGS. 8A to 8D, for example. That is, FIG.
(A) is formed in a conical shape, and the apex is bent at the reference line 2
I am trying to match. FIG. 8B shows an elliptical shape in which a ridge line is formed at the lowest point and the ridge line is made to match the bending reference line 2. FIG. 8C shows a rhombus shape, and the ridgeline formed at the lowest point is made to match the bending reference line 2. Furthermore, FIG.
(C) is formed in a rhombus shape, and the apex is bent at the reference line 2
I am trying to match.

In each of the modified examples shown in FIGS. 8A to 8D, the lowest point of the guide recess 3 is formed in a dot shape or a linear shape, but the bottom surface 32 is formed as shown by a chain double-dashed line. It may be formed. At this time, the intersection of the extension lines of the tapered surface 31 formed on the inner side surface of the guide recess 3 may be formed so as to coincide with the bending reference line 2. It may be a hemispherical guide recess 3 that matches the reference line 2.

On the other hand, FIG. 4 and FIG. 5 show an embodiment of the bending punch 5 for bending the workpiece 1 on which the guide recess 3 is formed. That is, the bending punch 5 has punched bodies 51 each having a tapered surface 54 having the same inclination angle θa as that of the guide punch 40 at the tip of which the V-shaped cross section is formed, and arranged on both sides of the punched body 51. , A guide portion forming block 52 provided with a guide portion 55 to be engaged with the guide concave portion 3.

The guide portion forming block 52 has the same inclination angle θa as the taper surface 31 so as to engage with the guide concave portion 3.
A guide portion 55 having a V-shaped tip shape is provided by forming two tapered surfaces having The guide portion 55 is formed at the tip of the guide pin 53, and the guide pin 53 is fitted in the insertion hole in the guide portion forming block 52 so as to be able to move back and forth. The width of the guide portion 55 is set to be slightly smaller than the longitudinal direction and the length so that the guide portion 55 can be easily fitted into the guide concave portion 3. Further, one end of the pressing spring 56 is brought into contact with the other end portion of the guide pin 53 to keep the guide pin 5
3 is urged toward the tip to guide the guide portion 55 to the punch main body 51.
So that it protrudes from the tip of. This protrusion amount is regulated by a locking portion 53a formed on the other end side of the guide pin 53 so as to be set to be slightly larger than the depth of the guide concave portion 3.

6 and 7 show another embodiment of the guide portion forming block. The guide portion forming block 6 is composed of three metal plates, and a guide plate 61 having a guide portion 60 formed at its tip is vertically movable in the center. That is, the support plates 62 and 63 on both sides are formed in the same shape as the punch main body 51, and a tapered surface 64 having the same inclination angle as the guide punch 40 having a V-shaped cross section is formed at the tip. Has been done. Also, both support plates 62, 6
A spacer 65 having a thickness permitting the movement of the guide plate 61 is interposed on the upper part of 3 and fixed by screws 66.

The guide plate 61, which is movably supported between the two support plates 62 and 63, has a tip end having an inclination angle substantially equal to that of the tapered surface 31 of the guide recess 3.
A V-shaped guide portion 60 having two tapered surfaces is formed. Further, two elongated holes 61a that are elongated in the vertical direction are formed in the central portion, and guide bars 67 fixed to the support plates 62 and 63 on both sides are inserted into the elongated holes 61a. As a result, the movement range of the guide plate 61 is restricted by the elongated hole 61a. Further, a pressing spring 68 is provided between the upper end surface of the guide plate 61 and the inside of the spacer 65, and the elastic force of the pressing spring 68 normally urges the guide plate 61 downward in the drawing. At this time, as shown in FIG.
It slightly projects from the tip of 63 and engages with the guide recess 3 by this projecting portion.

The guide portion forming blocks 6 configured as described above are arranged on both sides of the punch main body 51 in FIG. 6, but the narrow punch blocks 7 are made to match the bending width of the workpiece 1. When used in such a manner, the guide portion forming block 6 can be arranged at any position as one punch block 7.

On the other hand, the die 6 facing the bending punch 5 has a V formed at a predetermined angle θa as shown in FIG.
A groove 61 is formed, and the angle of the V groove 61 is an angle at which the workpiece 1 is bent at a predetermined angle θa.

Next, a method of bending the workpiece 1 will be described. 2A and 2B illustrate a process of forming the guide recess 3. As shown in FIG. 2 (A), a guide punch body 4 having an upper part attached to a movable mechanism such as a press machine (not shown) is lowered on the workpiece 1 cut into a predetermined shape. Then, the guide punch 4 is brought into contact with the bending reference line 2 and the guide punch 4 is pressed with a predetermined pressing force. As a result, the material 1 to be processed is shown in FIG.
The guide recess 3 is formed as shown in FIG.

In FIG. 2B, this guide recess 3
Is formed so that the other surface side of the work piece 1 is raised. This rise occurs depending on the material of the work piece, the plate thickness, or the pressing force of the guide punch.
Therefore, as shown in FIG. 9, it is possible to appropriately set the pressing force of the guide punch body so as not to raise it to the other surface side. Incidentally, when the pressing force of the guide punch body is small, a burr is generated around the guide concave portion 3, and when the pressing force is large, the other surface side is raised. However, even if burr or bulge occurs, these traces disappear to the extent that they can hardly be visually recognized in the molded product that has been subjected to the bending process.

As described above, the guide recess 3 is formed in the workpiece 1.
After forming, the bending process is performed by the bending punch 5 as shown in FIGS. First, the material 1 to be processed is placed and set on the die 6. At this time, since the guide recess 3 is formed in the work material 1, it is possible to prevent the operator from making a mistake on the front and back surfaces of the work material 1. Next, the position of the guide recess 3 is set to the V groove 61 formed in the die 6.
Approximately match the vertical line from the center of. From this state, the bending punch 5 having an upper part attached to a movable mechanism of a press machine (not shown) is lowered. At this time, the guide portion 55 is projected at the tip of the bending punch 5 by the guide pin 53 being biased by the pressing spring 56.

Then, as shown in FIG. 2C, the guide portion 55 is caused to enter the guide concave portion 3 by the lowering of the bending punch 5, and the tapered surface of the guide portion 55 and the tapered surface 31 in the guide concave portion 3 are substantially in contact with each other. At the same time, the tip of the guide 55 is brought into contact with the ridge of the guide recess 3. As a result, the tip of the bending punch 5 matches the bending reference line 2 of the workpiece 1.

When the guide portion 55 is inserted into the guide concave portion 3 as described above, if the guide concave portion 3 is displaced with respect to the tip of the guide portion 55, the guide portion 55 and the tapered surface of the guide concave portion 3 force the guide portion 55. The workpiece 1 is mechanically displaced, and the workpiece 1 can be positioned at an accurate position with respect to the bending punch 5.

After that, when the bending punch 5 is further lowered,
As shown in FIG. 2D, the guide portion 55 retracts against the urging force of the spring 56, and the tip of the guide portion 55 and the tip of the bending punch 5 are substantially aligned and integrated. If the bending punch 5 is further lowered from this state, the work material 1 is pressed by a predetermined pressing force, the work material 1 is bent along the bending reference line 2 and enters the V groove 61 of the die 6. Go.
When the pressing force of the bending punch 5 causes the other surface of the workpiece 1 to come into surface contact with the V groove 61 of the die 6, when the bending punch 5 stops, the bending work is completed into a shape corresponding to the V groove 61. After that, although not shown, the bending punch 5 is raised,
The bent work piece 1 is taken out from the die 6.

As shown in FIG. 1, when the three bending reference lines 2 of the workpiece 1 are bent to form a substantially box shape, after bending one bending reference line 2 as described above, Workpiece 1
Is placed on the V groove 61 of the die 6 in alignment with the next bending reference line 2. Then, the guide portions 55 of the bending punch 5 are inserted and positioned in the pair of left and right guide recesses 3 formed on the bending reference line 2 by the above-described method, and the bending punch 5 is lowered to perform bending work. After that, the remaining bending reference lines 2 are similarly bent and completed.

As described above, according to the method in which the guide portion 55 of the bending punch 5 is inserted into and positioned in the guide concave portion 3 corresponding to the bending reference line 2 formed in advance on the workpiece 1, the bending process is performed. Since the work piece 1 is bent using the recess 3 as a so-called proof, even if there is a variation in the plate thickness of the work piece 1, it is irrelevant to the center line in the direction of the plate thickness t1 which was the standard of the conventional bending work. It is possible to obtain highly accurate finished dimensions. Also, as in the example of FIG.
When bending at a plurality of locations, unlike the conventional method in which bending is performed while abutting one end surface of the workpiece 1 to determine the position, it is not necessary to consider the bending sequence, and it is optional. Bending can be applied from the point.

FIG. 10 shows another embodiment of the bending punch 5, which is an example in which a punch block 7 having a narrow width is connected and used so as to match the bending width of the workpiece 1. In addition, by making the widths of the blocks different from each other, it becomes possible to further correspond to an arbitrary bending width by a combination.

FIG. 11 shows another embodiment according to the present invention, in which after the position of the guide recess 3 is detected by an optical sensor, the bending punch 5 is used for bending. That is, as in the example described above, the V of the die 6
The optical sensor 8 detects the tapered surface 31 of the guide recess 3 so as to be positioned corresponding to the groove 61, and the bending punch 5 is lowered at this position to perform bending. According to this, it is not necessary to provide the bending punch 5 with the guide portion 55, and the normal bending punch 5 can be used. Further, the method of using the optical sensor 8 is suitable when a progressive die is used.

Needless to say, the present invention is not limited to the embodiment described above, and various modifications can be made without departing from the scope of the present invention.

[0045]

According to the present invention described above, claim 1
In the bending method for a work piece according to the invention described, since the guide concave portion for positioning and guiding the tip of the punch is formed on the bending reference line with which the bending punch is abutted, it is affected by variations in plate thickness and shearing surface. Bending can be performed with high accuracy. As a result, preparatory work such as measurement of the plate thickness and setting of the contact position can be omitted, and the bending process time can be shortened. Further, defects due to errors in finished product dimensions due to variations in plate thickness and the like are prevented, and productivity can be improved. As a result, the dimensional error of the product is significantly reduced, so that the measurement such as inspection can be simplified.

Further, according to the bending method of the invention described in claim 2, since the intersection of the taper is aligned with the bending reference line, the position of the bending punch can be accurately set on the bending reference line. As a result, highly accurate bending can be performed.

Furthermore, in the bending method according to the third aspect of the present invention, the position of the bending punch is initially set accurately in the guide portion and retracted at the time of bending, so bending is performed without being affected by the guide portion. be able to.

In the bending method according to the fourth aspect of the present invention, since the interval adjusting block is connected between each functional block of the guide recess forming block and the guide forming block, the dimension of the workpiece is Alternatively, it is possible to set the position of the guide recess appropriately.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of a method for bending a work material according to the present invention.

2 (A) to 2 (E) are process explanatory views showing a bending method of a material to be processed according to the present invention, and (A) and (B).
[FIG. 4] is an explanatory view showing a step of forming a guide recess in a work material, and (C), (D), and (E) are explanatory views showing a step of bending a work material in which a guide recess is formed. .

FIG. 3 is a perspective view showing a guide punch body according to an embodiment of the present invention.

FIG. 4 is a perspective view showing a bending method for a work piece according to the present invention.

5 is a schematic cross-sectional view taken along the line II ′ in FIG.

FIG. 6 is a perspective view showing another embodiment of the guide portion forming block according to the present invention.

7 is a cross-sectional view showing the internal structure of the guide portion forming block in FIG.

8A to 8D are explanatory views showing a modification of the guide recess formed by the guide punch body according to the present invention.

FIG. 9 is a perspective view showing a guide recess formed by the guide punch according to the embodiment of the present invention.

FIG. 10 is a perspective view showing another bending punch according to the present invention.

FIG. 11 is a perspective view showing detection of a guide recess according to the present invention by an optical sensor.

FIG. 12 is a side view showing a conventional method for bending a material to be processed.

FIG. 13 is a side view showing a work piece formed by using a conventional method for bending a work piece.

[Explanation of symbols]

1 Work material 3 Guide recess 31 Tapered surface 4 Guide punch 40 Guide recess forming block 5 Bending punch 52 Guide portion forming block 55 Guide 6 dice 61 V groove

Claims (4)

[Claims] 1. A method of bending a work material by placing the work material on a die having a V groove and pressing a bending punch against the work material to bend the work material. A plurality of guide recesses for positioning and guiding the tip of the punch are formed at predetermined positions on the bending reference line to be machined, and a plurality of guides provided at the tip of the bending punch are engaged with the guide recess. After that, the bending work is performed by bringing the work into contact with the inner surface of the V groove of the die by pressing the bending punch to perform the bending. 2. The guide recess is formed in a taper shape in which the width is narrowed from one surface of the workpiece to the other surface, and an intersection point of the extended taper is aligned with the bending reference line. The method for bending a work material according to 1. 3. The guide portion provided at the tip of the bending punch always protrudes from the tip of the bending punch, and when the tip of the bending punch comes into contact with the workpiece after engaging with the guide recess. Claim 1 constituted so that it may retreat.
Alternatively, the method of bending a material to be processed according to item 2. 4. The guide punch or the bending punch comprises at least two guide recess forming blocks,
The method for bending a work material according to claim 1, further comprising a guide portion forming block, wherein a space adjusting block is connected between the blocks, and the positions of the guide recess and the guide portion are matched. .