JP3385278B2 - Manufacturing method of metal products - Google Patents

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a method for manufacturing a metal product.

[0002]

2. Description of the Related Art Generally, a strip-shaped metal plate obtained by slitting or shirring a rolled thin steel plate and cutting it to a predetermined width is passed through a leveler and subjected to press working such as punching and cutting, followed by pressing. When it is bent into an L shape by a brake or the like, a product (bent plate) 101 bent in the lateral direction (width direction) as shown in FIG. 9A may be obtained. The symbol W is a gap when the same products 101 are opposed to each other, and has a size twice as large as a warp or a bend. If such bending or bending exceeds the allowable dimension, the product becomes defective and the yield decreases. There are several possible causes for this bending, but the bending that occurs when slitting the original coil material 102 into the coil material 103 having a predetermined width as shown in FIG. 9b appears as it is after correction by a leveler or bending. Is thought to be one of the causes.
In addition, when the thickness of the original plate is non-uniform or has internal strain, it may become visible as a bend by passing the metal plate through a leveler or by bending it. Probable cause.

[0003] For example, in the case of cold rolling for manufacturing the coil material 102, the central portion of the pressure roller has a relatively uniform thickness. However, as shown in FIG. 9c, the coil material 102
In the vicinity of the side edge portion of, there is a tendency that the thickness becomes slightly thinner as the side edge 104 is approached. Such coil material 102
Has an internal strain, and it is conceivable that the internal strain becomes apparent due to the slitting and bends in the lateral direction.
In the slitted coil material 103 near the side, the thickness T becomes non-uniform, and when the corrugation is corrected by the leveler before press molding, a slight lateral change occurs due to the influence of changes in internal stress. It is also possible that it will turn in the direction.

[0004] Conventionally, in order to prevent the bending of the bending plate, a rolled steel plate having a uniform thickness is purchased, or a slitted plate is purchased. This is handled by tightening the dimensional control at the time of purchase. When cutting in-house, the dimensional control of the cutting width may be tightened, and cutting may be performed while restraining the lateral bending of the plate. Further, when the product is bent, it may be possible to bend it with a roller bender or straighten it with a press or the like.

[0005]

Strict dimensional control of the purchased product and strict dimensional control at the time of cutting at the company lead to cost increase. Further, it is actually difficult to correct a bent product in mass production, and even if it is possible, it is too costly. SUMMARY OF THE INVENTION It is an object of the present invention to provide a method for manufacturing a metal product in which an actual or latent bending of a bent plate is corrected in advance and thereby no bending occurs.

[0006]

Means for Solving the Problems] manufacture of metal products of the present invention
Law, is run a strip-shaped metal plate in the longitudinal direction, the metal plate
Pressurized to linearized has a narrow pressure roller width, the pressurized metal plate is cut into a predetermined length, bent in an L-shaped cross section along its longitudinal fold lines, folding the metal plate Song
Measures warpage and warpage, without any bending or warpage
The position and pressure of the pressure roller are adjusted so that In that case, after the pressurizing step, the metal plate is passed through a leveler to correct the entire waviness.
Then, the step of cutting may be performed. Also before
After cutting the metal plate, measure the bending of the metal plate,
The position and pressure of the pressure roller should be adjusted so that there is no bending.
Adjust the pressure and then bend the L-shaped section
You may do it .

A second aspect of the method for producing a metal product of the present invention is to send a coil material from an uncoiler, correct the undulation with a leveler, then supply it to a press, press it while cutting it into a predetermined length , Then bend in the longitudinal direction
A method for producing metal product Ru bent in an L-shape along the lower line, just before sending the coil material leveler, and pressure linearized with narrow pressure roller width, bent into an L-shaped cross section Money
The bending and warping of metal products are measured and the bending and
Position and pressure of the pressure roller to eliminate warpage
It is characterized by adjusting power.

[0008]

The first aspect of the method for producing a metal product of the present invention (claim)
In Section 1), the longitudinal strip-shaped metal plate which is a material
Direction, and apply linear pressure with a narrow pressure roller
To correct any visible or latent bends
It Then cut it to a specified length and fold it into an L-shaped cross section.
The bending and warping of the bent and bent metal plate is measured.
And so that the measured bending and warping are eliminated
First, the position and pressure of the pressure roller are adjusted. Shi
Therefore, not only the bending that is apparent on the metal plate, but also the bending
Eliminate the bending and warpage that occurs after processing.
You can When the metal plate is linearly pressed, a shallow groove that is almost invisible to the eyes is formed, so that the portion is elongated in the longitudinal direction. Therefore strip-shaped metal plate is forced to bend in the decoction I <br/> if the same plane. Thus, the present invention
In the first aspect of the manufacturing method of
Apply linear pressure that corresponds to the bending and warpage that occurs after the
By performing and forcibly causing a bend, L
Eliminates bending and warping of the final metal product bent into a letter shape
I am trying to do it. The shape of the shallow groove is invisible, but indentations that are the same as the width of the roller usually remain linear. Also, internal stress is usually induced. Thus, in the manufacturing method of the present invention, rather than simply correcting the defective portion,
It is characterized in that it causes a defective portion to appear in a normal portion and finally eliminates the entire bend and warp .

[0009]

[0010]

In the manufacturing method of the metal product, pressure is applied.
After step, the whole was further through a strip-shaped metal plate leveler
When correcting the waviness of and then performing the cutting step
In the state of the metal plate before bending, the three-dimensional warp is corrected and the flatness is improved. Further, when the strip-shaped metal plate is a coil material, the leveler is passed through to correct the curling and wavy deformation. At this time, internal stress or internal strain may be induced. But as above
No bending or warping based on measurements after bending
Since the position and pressure of the pressure roller are adjusted so that
Finally, a metal product with less bending and warping can be obtained. Incidentally, the indentation of the roller width described above is usually not eliminated even after correction by the leveler. After cutting the metal plate,
Measure the bend and pressurize to eliminate the bend
Adjust the position and pressure of the roller, then cross section L
If you want to make a bent shape,
There is less bending in the state. Therefore, bending is easy
Even if bending is performed after that, there is little bending.
You can get no products.

In the second embodiment of the method for producing a metal product of the present invention, the coil material is sent out from the uncoiler,
To correct the waviness and then feed it to the press for a specified length.
Press while cutting into pieces. Thus three-dimensional deformation such as curl and waving of the coil material by levelers
It is pre- corrected before pressing . After further press working , the cross section is taken along the longitudinal bending line.
It is bent into an L shape to manufacture metal products.
In addition, just before sending to the leveler, it is linear with a narrow pressure roller.
Bending of a metal product that has been pressed into a shape and bent into an L-shaped cross section
And the warp is measured and the bend and warp are eliminated
Thus, the position and pressure of the pressure roller are adjusted. So
Therefore, a metal product with little bending or warping can be finally obtained.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, preferred embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a schematic perspective view showing an embodiment of a straightening step in the manufacturing method of the present invention, FIGS. 2a and 2b are plan views of a metal plate for explaining the effect of the straightening step of FIG. 1, and FIG. Fig. 4a is a perspective view of a main part showing an embodiment of a straightening device used in the manufacturing method of the invention.
And FIG. 4b are a partial sectional plan view and a partial sectional front view of the straightening device of FIG. 3, respectively, FIG. 5 is a cross sectional view taken along line VV of FIG. 4b, and FIG. 6 is another embodiment of the straightening device used in the manufacturing method of the present invention. FIG. 7a is a schematic cross-sectional view showing a form, and FIG. 7a is a schematic plan view showing one embodiment of a processing line for carrying out the manufacturing method of the present invention.
FIG. 7b is an enlarged sectional view taken along line VII-VII of FIG. 7a, and FIG. 8 is a molding process diagram showing in order the molded products obtained in each process of the processing line.

FIG. 1 shows a basic aspect of a straightening step which is a characteristic part of the manufacturing method of the present invention. In this step, the strip-shaped metal plate 1 is run in the longitudinal direction (arrow F), and linearly pressed by the pressure roller 3 having a narrow width along the vicinity of the one side edge 2 (arrow N). On the lower surface side of the metal plate 1, a wide pressure roller (base roller) 4 that is paired with the pressure roller 3 is arranged, and the metal plate 1 is sandwiched between them. In this case, the deformation caused by the pressing extends in a groove shape on the order of 1/1000 to 1/100 mm. However, in reality, the deformation of the depth cannot be confirmed with the naked eye, and it can be seen only as a change in the reflected light as if the impression 5 by the pressure roller 3, that is, the surface is in a matte state. The width of the pressure roller 3 on the upper side, which has a small width, varies depending on the plate thickness, the hardness of the plate, etc., but is usually about several millimeters to several tens of millimeters, particularly about 5 to 30 mm.

Due to the above deformation, the vicinity of the side edge 2 of the metal plate 1 is slightly stretched in the direction of the arrow PP. At that time, the force (arrow Q-
Since Q) works, the entire long metal plate 1 is bent in the R direction in an arc shape. Therefore, depending on the state of the original metal plate, if you adjust the pressing position, pressing strength, etc.,
Appropriate straightening can be performed. This bend R
Actually, it can hardly be confirmed by naked eyes, but it can be easily detected by combining two metal plates as described later.

For example, the metal plate 1 shown on the upper side of FIG.
The center part is bent upward. The degree of bending is, for example, the same metal plate 1 cut into a predetermined length.
Can be quantified by measuring the largest gap W or dividing the dimension of the gap W by the length of the metal plate. The degree of bending is, for example, 2 to 3 m
And the gap W is about 1 to 5 mm. In the case of such a metal plate 1, when a portion near the upper side edge 2 of the metal plate 1 is linearly pressed by the pressing roller 3, if the pressurizing condition is appropriate, it is shown in the lower side of FIG. 2a. Thus, a substantially straight metal plate 1 is obtained. The case of FIG. 2a is an embodiment for correcting the bending that is originally manifested.

On the other hand, the metal plate 1 shown at the top of FIG.
The appearance is straight. However, the thickness is non-uniform in the width direction, or internal strain remains, so that bending occurs when it is passed through the leveler.
That is, this metal plate 1 has a potential bend. In this case, the sample is passed through a leveler in advance to confirm the potential bending direction, and then the product metal plate is pressed with a pressure roller in advance so as to bend in the opposite direction. That is, in the case of FIG. 2b, as shown at the bottom, when it is passed through the leveler, since it bends in the direction of arrow R1, as shown in the center of FIG.
Press the pressure roller along near. Thereby, the metal plate 1 bends in the direction of arrow R2, but the potential bend is corrected. After that, when it is passed through a leveler, it bends in the direction of arrow R1 so that both are offset, and finally a straight metal plate 1 is obtained.

Next, an embodiment of a straightening device for carrying out the above-mentioned straightening step will be described with reference to FIGS.
The pressurizing device 10 shown in FIGS. 3 and 4 includes a base 11 that is long in the left and right, side columns 12 that rise from both ends thereof,
The frame 12 includes a frame 12 and a crown 13 provided between upper ends of the side columns 12 and 12. Three long holes 14 are formed in the crown 13 in the longitudinal direction,
15 and 14 are formed. The width of the central long hole 15 is larger than that of the other two long holes 14, 14. Then, by utilizing these elongated holes 14, 15, 14, the pressure roller assembly 16 can be adjusted in position in the left-right direction by three bolts 17,
Attached by 18,17. Further, the side column 12 rotatably supports both ends of a base roller 4 having a large diameter and a long length.

The pressure roller assembly 16 is, as shown in FIGS. 3 and 5, a U-shape slidably fitted in a step portion or a concave groove 21 formed on the lower surface of the crown 13 to the left and right. The slide block 22 and the roller support 23 that is slidably fitted in the slide block 22 are provided.
The roller support 23 has a U-shaped cross section, in which the shaft 2
The pressure roller 3 is rotatably supported by 4 (see FIGS. 4b and 5).

Further, as shown in FIG. 5, a through-screw hole 27 for screwing with the thick bolt 18 is formed on the upper surface of the slide block 22, and the small projection 28 at the tip of the thick bolt 18 penetrating the slide block 22 is formed. Roller support 23
Is fitted with the upper surface of. Therefore, the roller support 23 can be lowered by screwing the thick bolt 18. On the contrary, it can be raised by retreating. Thus, the thick bolt 18 functions as a pressing screw. An O-ring is fitted around the small protrusion 28 as a friction member for preventing the roller support 23 from falling off the slide block 22 during assembly. Further, a nut 30 as a loosening prevention is screwed onto the upper portion of the thick bolt 18.

Before and after the through screw hole 27 on the upper surface of the slide block 22, there are formed screw holes 31 and 31 which are screwed into the two thin bolts 17 and which do not penetrate. Two
The thin bolts 17, 17 are suspending bolts or mounting screws for fixing the slide block 22 to the position after adjusting the position of the slide block 22 in the left-right direction. As shown in FIG. 4a, support shafts 33, 33 are coaxially provided at the end of the base roller 4. The support shafts 33 are rotatably supported by the side columns 12, 12 via roller bearings 34.
In the above embodiment, the pressure roller assembly 16
2 sets are attached. However, it may be one set or three or more sets.

The pressure device 10 constructed as described above is
The thick bolt 18 of each pressure roller assembly 16 is lifted to eliminate the applied pressure, and then the strip-shaped metal plate 1 is passed between the pressure roller and the base roller 4 as shown in FIGS. 4B and 5. Then, the two thin bolts 17, 17 are loosened to attach the pressure roller assembly 16 to the long hole 14 of the crown,
It is moved left and right along 15 to determine the position in the left and right direction. At this time, 2 sets of pressure roller assembly 1
It is also possible to set 6 and 16 at substantially the same position so that both have a strong correcting action, and they can also be set at different positions in the width direction.

Then, the thick bolt 18 is screwed to lower the roller support 23, sandwich the metal plate 1 between the pressure roller 3 and the base roller 4, and apply a predetermined pressure.
Then, the metal plate 1 is run. The position and pressure of the pressure roller 3 are usually determined by trial and error while confirming the bending state and correction state of the product. For example, in adjusting the pressing force, a thick bolt for adjusting the pressing force is rotated by a torque wrench and screwed. And read the tightening torque at that time,
Keep a record. Then, run the metal plate to check the degree of bending and the degree of correction. Then, depending on the result, the thick bolt 18 is further tightened again with a torque wrench, or is once retracted and then tightened with a torque weaker than the tightening torque. In this way, an appropriate torque, that is, a pressing force is detected.

Next, with reference to FIG. 6, a second embodiment of the straightening device used in the manufacturing method of the present invention will be described. The integrated straightening device 40 shown in FIG. 6 is one in which the above-described pressurizing device 10 is attached to the entrance of a conventionally known leveler 41. The leveler 41 includes a pinch roller 42 for gripping a material,
An upper roller group 43 and a lower roller group 44, which perform an actual leveling action, are provided. The rollers of the upper roller group 43 and the lower roller group 44 are arranged in a staggered manner, and the support 43a for holding the upper roller group 43 is configured such that the front and rear, left and right inclinations can be adjusted. Then, the metal plates 1 to be passed between the upper and lower roller groups 43 and 44 arranged in a zigzag pattern are alternately vertically arranged.
It is gradually weakened and finally flattened so that the coil material has a winding tendency. The leveler 41
For this, an NC control feeder leveler integrally provided with a feed roller 45 for supplying a coil material in synchronization with the operation of the press is suitable. However, of course, it may be a leveler separate from the feeder.

FIG. 7a is a plan view showing an embodiment of a metal plate processing line for carrying out the manufacturing method of the present invention.
An uncoiler 51 is arranged upstream of the processing line, and an integrated straightening device 40 in which the pressure device 10 is attached to the leveler 41 is arranged downstream thereof. Further downstream thereof, a press 52 for piercing the metal plate 1 and cutting the metal plate 1 for cutting is disposed. Further, in this embodiment, the press brake 53 is arranged for the bending process in the post-process of the press 52. As shown in FIG. 7b, the press brake 53 is provided with a bending die including a lower die 54 having a 90-degree V-shaped groove and an upper die 55 that fits the lower die.

In this processing line, first, the uncoiler 51
The metal plate 1 made of the coil material unwound from the body is straightened by the integrated straightening device 40 so as to correct left and right bends and upper and lower undulations. The details are as described above (see FIG. 2). In this case, the power for running the metal plate 1 and supplying it to the press is the feeder roller (4 in FIG. 6) of the leveler 41.
5). Corrected metal plate 1 at this time
Is shown in the upper part of FIG. Then, the straightened metal plate 1 is perforated in the press 52 as shown in the middle part of FIG. The metal plate 1 delivered from the press 52 is cut near the exit of the press 52 to separate it from the coil material (see interrupt symbol S in FIG. 8). Further, the metal plate 1 after the cutting is carried to the press brake 53, and is bent 90 degrees along the center line to form a product 56, as shown in the lower part of FIG.

In this processing line, the metal plate 1 is pressed by the press 5
Before entering No. 2, the bends on the left and right as well as the undulations are corrected, so there is almost no meandering or rising in the mold, and the processing accuracy is high. When the gap W is measured by combining two metal plates in the upper stage of FIG. 2 and the like, it is preferable to use a flat intermediate molded product at the stage after this press working because the measurement is easy. The intermediate molded product in which the left and right bends are corrected is less likely to warp or bend even when bent by the press brake 53, and even if the two products 56 are aligned as shown in FIG. Absent. In addition, when the gap W of the final product in this line is measured and the position and pressure of the pressure roller of the pressure device are adjusted so as to eliminate this gap W, the left and right bends caused by the bending of the press brake 53 are adjusted. Also in the same manner as described above, it is possible to correct it beforehand as a potential bend.

In the embodiment of the pressing device described above, the lower base roller (reference numeral 4 in FIGS. 1 and 3) has the same width as the metal plate 1 to be straightened or a width slightly wider than that. Therefore, it is not necessary to adjust the left and right positions of the base roller 4. However, the lower base roller 4 may have the same width as the upper pressure roller 3. In that case, the base roller 4 is rotatably attached to the slide block 23 shown in FIG. 3 and the like, and the slide block 23 is slid left and right so that the left and right positions can be adjusted. Since the pressing force can be adjusted only by the upper pressing roller 3, the base roller 4 does not need a mechanism for moving the roller support up and down with a thick bolt for adjusting the pressing force. However, it is also possible to make the pressing force adjustable by the base roller 4 by using, for example, a hydraulic cylinder whose hydraulic pressure can be adjusted by a regulator. In that case, the upper pressure roller 3 need only be adjustable in position. This is the same even when the width of the lower base roller 4 is wide.

[Brief description of drawings]

FIG. 1 is a schematic perspective view showing an embodiment of a correction step in the manufacturing method of the present invention.

2a and 2b are plan views of a metal plate for explaining the effect of the straightening process of FIG. 1, respectively.

FIG. 3 is a perspective view of an essential part showing an embodiment of a straightening device used in the manufacturing method of the present invention.

4a and 4b are a partial sectional plan view and a partial sectional front view of the device of FIG. 3, respectively.

5 is a sectional view taken along line VV of FIG. 4b.

FIG. 6 is a schematic cross-sectional view showing another embodiment of the straightening device used in the manufacturing method of the present invention.

7A is a schematic plan view showing an embodiment of a processing line for carrying out the manufacturing method of the present invention, and FIG.
FIG. 7 is an enlarged sectional view taken along line VII-VII of FIG.

8A to 8D are molding process diagrams sequentially showing processed products obtained in each process of the processing line of FIG.

9a is a perspective view showing an example of bending of a metal product according to the present invention, FIG. 9b is a schematic perspective view showing a slitting state of a metal plate, and FIG. 9c is a thickness state of the metal plate. FIG.

[Explanation of symbols]

1 metal plate 2 side edges 3 pressure roller 4 Pressure roller (base roller) 10 Pressurizing device 16 Pressure roller assembly 40 integrated straightening device 41 Leveler 51 Uncoiler 52 Press 53 Press brake

Claims (4)

(57) [Claims] 1. A is traveling belt-like metal plate in the longitudinal direction, the metal plate, pressed linearized with narrow pressure roller width, cut the pressurized metal plate to a predetermined length, the Folded and bent into an L-shaped cross section along the bending line in the longitudinal direction
Measure the bending and warping of a metal plate and check the bending and
Position and pressure of the pressure roller to eliminate warpage
Adjust the power, process for the preparation of metal products. 2. After the pressurizing step, a metal plate is further passed through a leveler to correct the entire waviness, and then the cutting is performed.
The manufacturing method according to claim 1, wherein the step of cutting is performed . 3. After cutting the metal plate, the bending of the metal plate
The pressure is measured so that the bending is eliminated.
Adjust the position of la and the pressure, then L-shaped cross section
The metal product according to claim 1 or 2, which is bent.
Construction method. 4. A coil material is fed from an uncoiler, straightened by a leveler to correct waviness, then supplied to a press, pressed while being cut into a predetermined length , and then its longitudinal direction.
A method for producing metal product Ru bent in an L-shape along a folding line direction, just before sending the coil material leveler, and the pressure in the linear width of a narrow pressure roller, an L-shaped cross section To
Measure the bending and warpage of bent metal products and
The position of the pressure roller is adjusted so that there is no bending or warping.
A method of manufacturing metal products with controlled pressure and pressure .