JP4240670B2 - Method and apparatus for forming ribbed plate - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a lower roll which forms a pair of a ribbed plate material in which a flat plate portion formed with a predetermined width and a rib forming portion in which a plurality of ribs of a fixed height project on a flat plate are provided. It is related with the shaping | molding processing method and processing apparatus of a board | plate material with a rib which press-press between them and performs a bending shaping | molding process.
[0002]
[Prior art]
For cylinder skins of rocket body tanks, casings for pressure vessels, etc., a plate with ribs with reinforcing ribs in the form of grids and stripes on the inner surface side of the flat plate is bent forward and bent with a brake press. To a predetermined radius of curvature. And this board | plate material piece is couple | bonded by welding etc., and the single cylinder is manufactured.
[0003]
4 to 5 show an outline of a ribbed plate as such a plate piece, FIG. 4 is a perspective view thereof, FIG. 5 is a sectional view taken along line BB of FIG. Is a plate member with ribs, and is composed of a flat plate portion 2 in the periphery and a rib forming portion 3 in which ribs 3a are projected in a lattice shape, a striped shape or the like inside the flat plate portion 2, and the rib forming portion 3 Is bent and molded at a predetermined radius of curvature R (see FIG. 5) so that the inside of the bend is inside.
[0004]
6 to 9 show an outline of press-bending a ribbed plate material, FIG. 6 shows a pressing position when press forming, FIGS. 7 and 8 show a rib position and a forming state at a flat plate portion, and FIG. FIG. 8 is a perspective view of FIG. 7.
[0005]
That is, as shown in FIG. 7, when the ribbed plate material 1 is manufactured by bending, the ribbed plate material 1 is placed on the upper surface of the die 40 and is simultaneously pushed by the punch 30 and slightly bent. To do.
Subsequently, the plate 1 with ribs shown in FIG. 6 is moved in the X direction, and the rib intersecting portion 3 </ b> C in the next row is pushed by the punch 30. Repeat until the last column.
This operation is repeated about 5 times until a predetermined curvature R is reached, and bending is performed.
[0006]
In order to bend the end portion of the flat plate portion 2, as shown in FIG. 8, the rib 31 is replaced with a punch 31 and a die 41 which are formed differently, and is bent little by little at a pitch of about 50 mm to obtain a predetermined curvature. Mold until R.
[0007]
[Problems to be solved by the invention]
The ribbed plate 1 shown in FIGS. 4 to 5 has a structure in which a peripheral portion having a constant width from the end portion is a flat plate portion 2 and the rib forming portion 3 is surrounded by the flat plate portion 2. The peripheral portion where the flat plate portion 2 is formed has a large and rigid structure, and the central portion where the rib forming portion 3 is located has a flexible structure which is considerably smaller than the peripheral portion.
[0008]
For this reason, as shown in FIG. 7, in order to push and bend the ribbed plate material 1 with the punch 30, if it is locally formed per line and the pushing amount is too large, the rib 3a falls down and is deformed, and cracks are formed in the vicinity of the rib 3c. Problems are likely to occur.
[0009]
On the other hand, in order to avoid the occurrence of the above-described problem, as shown in FIG. 6, the rib intersection portion 3 c having high rigidity is formed little by little during bending of the ribbed plate material 1, which requires a great amount of man-hours. The processing man-hours increase.
[0010]
Further, the rib end portion is formed by changing the mold to another punch 31 and die 41 having a narrow width, and the rib end portion is formed little by little, which further increases the number of processing steps.
[0011]
In view of the problems of the prior art, the present invention eliminates the need to adjust the lower roll and the pressing force at the time of processing when bending a plate with ribs composed of a peripheral flat plate portion and a central rib forming portion. It is an object of the present invention to provide a molding method and apparatus capable of obtaining a high-quality molded product with less processing man-hours and no generation of processing defects such as bending during processing and non-uniform processing due to abnormal deformation.
[0012]
[Means for Solving the Problems]
In order to solve this problem, the present invention provides a flat plate portion formed with a predetermined width and a plurality of ribs such as a lattice shape and a stripe shape formed on the flat plate with a constant height. The rib-formed plate material formed by connecting the rib-forming portions thus formed is pressed between the two lower rolls paired with the upper roll, and is bent so that the rib side becomes the bending inner peripheral side. In the method of forming a ribbed plate,
Forming at least two locations of the upper roll in a large diameter portion having a diameter larger than the small diameter portion of the other portion;
While pressing the flat plate portion of the plate material between the large diameter portion and the lower roll, bending the plate material by positioning the rib on the lower side of the small diameter portion ,
Further, when the outer diameter of the large-diameter portion is pressed against the flat plate portion with the large-diameter portion, a minute gap is formed between the small-diameter portion and the top surface of the rib before processing, A method of forming a ribbed plate material is proposed, in which the small-diameter portion and the top surface of the rib are bent.
[0014]
Then, in order to establish a bending processing method as claimed in claim 1, as claimed in claim 2, wherein greater than the center distance between the large-diameter portion the upper roll and the lower roll diameter (pitch) And bending.
[0015]
In this invention, the upper roll determines the shape and arrangement of the large-diameter portion and the small-diameter portion corresponding to the structure of the ribbed plate material to be bent. Generally, the ribbed plate material is shown in FIG. As shown in FIG. 2, since the rib forming portion 3 is provided at the center, and the flat plate portion 2 is arranged around the rib forming portion, the upper roller has flat plate portions of the ribbed plate material 1 at both ends thereof. Two large diameter portions that can contact 2 are arranged, and a small diameter portion smaller than this is arranged between the large diameter portions, and the outer periphery of the small diameter portion and the upper end surface of the rib forming portion of the ribbed plate member, during, it is good for machining to form a minute gap as claimed in claim 1, wherein the machining initial.
[0016]
The invention according to claim 4 relates to an apparatus for carrying out the invention according to claims 1 to 3, and a flat plate portion formed with a predetermined width and a plurality of ribs such as a lattice shape and a stripe shape on the flat plate are constant. A ribbed plate formed by connecting a rib forming portion formed at a height is pressed between two lower rolls that are paired with an upper roll, and the rib side is a bent inner circumferential side. In the plate material forming and processing apparatus that performs bending forming so that
At least two portions of the upper roll are formed in a large diameter portion having a diameter larger than the small diameter portion of the other portion, and the large diameter portion is in contact with the flat plate portion of the ribbed plate material, and the flat plate portion Is a ring part that can be pressed,
While pressing the flat plate portion of the plate material between the ring portion and the lower roll, bending the plate material by positioning the rib below the small diameter portion,
Further, when the outer diameter of the ring portion is pressed against the flat plate portion with the large diameter portion, a minute gap is formed before processing between the small diameter portion and the top surface of the rib, and the bending portion is in the middle of bending. The outer diameter of the ring portion is set in accordance with the height of the rib forming portion and the thickness of the flat plate portion so that the small diameter portion and the top surface of the rib come into contact with each other.
[0017]
And Ri by the present invention,圧挿the upper roll is a roll main body and the position of the roll body corresponding ring portion fabricated separately in the position of the flat plate portion of the ribbed plate, by fixing, various Applicable to size ribbed plate.
[0018]
According to this invention, in the initial stage of the bending process of the ribbed plate material, the bottom surface of the flat plate of the ribbed plate material is placed on the pair of lower rolls, and the large diameter of the upper roll is placed on the flat plate of the ribbed plate material. 1 and 2, a small gap of about t = 2 mm is formed between the outer peripheral surface of the small-diameter portion of the upper roll and the top surface of the rib of the ribbed plate member in a state where the portions are in contact with each other. .
[0019]
Next, the upper roll is rotated at a predetermined number of revolutions, while feeding the ribbed plate material, the upper roll and the lower roll are brought close to each other, and a pressing force is applied to the plate material. Thus, bending of the ribbed plate material starts while pressing the flat plate portion of the ribbed plate material between the large diameter portion of the upper roll and the lower roll.
[0020]
When the bending amount of the ribbed plate material by the pressing force reaches a certain amount, the minute gap disappears, and the outer peripheral surface of the small diameter portion and the rib top surface of the rib forming portion of the ribbed plate material come into contact with each other. The forming part is pressed between the small diameter part and the lower roll, and when the pressing force from the upper roll is further increased, the large diameter part simultaneously presses the flat plate part and the small diameter part simultaneously presses the rib forming part. The ribbed plate is bent with a predetermined radius of curvature with pressure.
[0021]
Therefore, according to this invention, only the low-rigidity flat plate portion is first pressed between the large diameter portion of the upper roll and the lower roll, and after a certain amount of bending progresses, it is added to the large diameter portion. Therefore, the thin and low-rigidity flat plate part is always pressed with a constant pressing force by the large-diameter part. Is avoided, and the occurrence of abnormal deformation and machining unevenness due to this is prevented, as well as the occurrence of breakage due to these.
In addition, since the flat plate portion is bent by a certain amount at the large diameter portion, the small diameter portion is brought into contact with the rib forming portion, so that no bending load is applied to the rib from the beginning of the bending process, and the rib collapses due to an excessive load. Such deformation is prevented.
Thereby, a flat plate part and a rib formation part are bend-molded uniformly, and the board | plate material with a uniform quality is obtained.
[0022]
In addition, the above-described processing can be performed only by forming a ring-shaped large-diameter portion corresponding to the height of the rib forming portion and the thickness of the flat plate portion on the upper roll, so the upper roll and the lower roll at the time of processing Adjustment work such as adjustment of the related position and adjustment of the pressing force becomes unnecessary, and the number of work steps is reduced.
[0023]
According to a fourth aspect of the present invention, in the first aspect, the one of the paired lower rolls is disposed so that the center thereof is located below the other lower roll, and the ribbed plate material is processed. At the time of setting, the plate material is bent so as to be inclined at a predetermined angle.
[0024]
According to this invention, a pair of lower rolls are inclinedly arranged at the time of bending forming processing by sandwiching a ribbed plate material between the upper roll and a lower roll that forms a pair and applying a molding pressing force to the upper roll. By doing so, the plate surface of the plate material is also inclined, and the molding pressing force applied to the plate material is reduced as compared with the prior art in which the plate surface of the plate material is horizontally arranged.
This prevents the occurrence of abnormal deformation due to the excessive pressing force of the flat plate portion and the occurrence of rib collapse due to the excessive pressing force acting on the rib forming portion.
[0025]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described in detail with reference to the embodiments shown in the drawings. However, the dimensions, materials, shapes, relative arrangements, and the like of the components described in this embodiment are merely illustrative examples and not intended to limit the scope of the present invention unless otherwise specified. Absent.
[0026]
FIG. 1 is a front view (a view taken along the line AA in FIG. 2) of a ribbed plate material by an upper roll according to an embodiment of the present invention, and FIG. 2 is a view of the ribbed plate material and the upper and lower rolls for molding. FIG. 3 is a side arrangement view, and FIG. 3 is a perspective view of a main part at the time of a rib-formed plate material bending process by an upper roll.
[0027]
1 to 3, reference numeral 1 denotes a ribbed plate material to be processed, and as shown in FIG. 4, is constituted by a peripheral flat plate portion 2 and a central rib forming portion 3. 20 and 20 are a pair of lower rolls, and 10 is an upper roll. The ribbed plate 1 is sandwiched between the pair of lower rolls 20 and 20 and the upper roll 10 while rotating the upper roll 10. By applying a pressing force, bending molding is performed.
[0028]
The upper roll 10 includes a central small diameter portion 10b and rings 10a and 10a press-fitted on both sides (outside) of the small diameter portion 10b. The rings 10a and 10a constitute a large diameter portion.
Further, the fixing positions of the rings 10a and 10a are determined in accordance with the positions of the flat plate portions 2 formed at both ends of the ribbed plate 1 which is a bending molded product.
The upper roll 10 is manufactured by separately manufacturing the rings 10a and 10a separately from the roll body 10d in which the small-diameter portion 10b is formed, corresponding to the position of the flat plate portion 2 in the ribbed plate 1 which is a processed product. By press-fitting and fixing to the main body 10d, it can be applied to processing the ribbed plate material 1 of various sizes.
[0029]
Further, the upper roll 10 has the plate 1 placed on the lower rolls 20 and 20 before the ribbed plate 1 is bent, and the outer peripheral surfaces of the rings 10a and 10a contact the flat plate portion 2 of the ribbed plate 1. When in contact, the ring (large diameter portion) 10a is formed such that a minute gap t (preferably about t = 2 mm) is formed between the outer peripheral surface of the small diameter portion 10b and the rib top surface 3b of the rib forming portion 3. , the outer diameter D ₂ of the outer diameter D ₁ and the small diameter portion 10b of 10a is set.
[0030]
Further, as shown in FIG. 2, the lower rolls 20, 20 that form the pair are configured such that the roll on the leading side with respect to the processing feed direction W of the ribbed plate member 1, that is, the bottom roll 20 a is more than the roll 20 b on the rear side. It arrange | positions a fixed amount downward, and this board | plate material 1 with a rib inclines only the angle (alpha) with respect to a horizontal line in the process initial stage.
The inclination angle α is preferably about 15 to 20 °, but is not particularly limited to this range, and can be arbitrarily set depending on the shape of the ribbed plate 1 that is a workpiece and other processing conditions.
[0031]
When the ribbed plate material 1 is bent using the ribbed plate material processing and molding apparatus having such a configuration, the flat plate of the ribbed plate material 1 which is a workpiece is formed on the pair of lower rolls 20 and 20. , And the pair of lower rolls in the initial stage of processing in which the outer peripheral surfaces of the rings 10a and 10a constituting the large diameter portion of the upper roll 10 are brought into contact with the flat plate portion 2 of the ribbed plate 1 As shown in FIG. 2, the bottle roll 20a on the leading side is disposed below the roll 20b on the rear side, and the ribbed plate 1 is inclined at an angle α with respect to the horizontal line. Arrange as follows. As described above, the angle α is preferably 15 to 20 °.
[0032]
In addition, as described above, in the initial stage of processing, between the outer peripheral surface of the small diameter portion 10b of the upper roll 10 and the top surface 3b of the rib of the rib forming portion 3 of the ribbed plate member 1, FIGS. As shown in FIG. 2, a minute gap t (preferably about t = 2 mm) is formed.
[0033]
While the upper roll 10 is rotated at a predetermined number of rotations by a rotating device (not shown) from the initial state of the processing in which such setting has been made, while feeding the ribbed plate 1 as shown by the arrow W in FIG. The roll 10 and the lower rolls 20 and 20 are brought close to each other, and a pressing force is applied to the ribbed plate 1. Thereby, the bending process of the ribbed plate material 1 starts while pressing the flat plate portion 2 of the ribbed plate material 1 between the rings 10a and 10a, which are large diameter portions of the upper roll 10, and the lower rolls 20 and 20. .
[0034]
When the bending amount of the ribbed plate material 1 due to the pressing force reaches a certain amount, the minute gap t disappears, and the outer peripheral surface of the small diameter portion 10b and the top surface 3b of the rib forming portion 3 of the ribbed plate material 1 The rib forming portion 3 is pressed between the small diameter portion 3b and the lower rolls 20 and 20, and when the pressing force is further increased, the rings 10a and 10a become the flat plate portion 2, and the small diameter portion 10b becomes the small diameter portion 10b. The rib forming part 3 is pressed at the same time, and the ribbed plate 1 is bent and formed with a predetermined radius of curvature with a large pressing force.
[0035]
At the time of bending, only the low-rigidity flat plate portion 2 is pressed between the rings 10a and 10a, which are large-diameter portions of the upper roll 10, and the lower rolls 20 and 20 at the beginning of processing, and the bending proceeds by a certain amount. After that, since the rib forming portion 3 is pressed by the small diameter portion 10b in addition to the ring portions 10a and 10a, the thin flat plate portion 2 having a low rigidity is always fixed by the rings 10a and 10a. It will be pressed by the pressing force, and the effect of an offset load or an excessive load will be avoided. As a result, the ribbed plate 1 can be bent and formed with a desired radius of curvature R without causing abnormal deformation and uneven machining.
[0036]
Further, since the flat plate portion 2 is bent by a certain amount by the rings 10a and 10a, the small diameter portion 10b is brought into contact with the rib forming portion 3, so that no bending load is applied to the rib 3a from the beginning of the bending process. .
Therefore, the rib 3a is not deformed such as falling due to an excessive load, and the ribbed plate 1 is uniformly bent.
[0037]
Further, since the upper roll 10 is provided with the ring portions 10a and 10a corresponding to the height of the rib forming portion 3 and the thickness of the flat plate portion 2, the desired bending forming as described above can be performed. Adjustment work such as adjustment of the relationship between the upper roll 10 and the lower rolls 20 and 20 and adjustment of the pressing force is not required.
[0038]
Further, at the initial stage of processing, since the relative positions of the paired lower rolls 20 and 20 with respect to the upper roll 10 are set so that the ribbed plate material 1 is inclined at an angle α as shown in FIG. Bending and forming can be performed with a pressing force smaller than that of the prior art in which the plate surface of the plate 1 is horizontally arranged, and the plate portion 2 is deformed due to excessive pressing or the excessive pressing force acts on the rib forming portion and falls down. Is avoided.
[0039]
【The invention's effect】
As described above, according to the present invention, only the low-rigidity flat plate portion is first pressed between the large diameter portion of the upper roll and the lower roll, and after a certain amount of bending proceeds, the large diameter is increased. Since the rib forming part is pressed by the small diameter part in addition to the part to perform bending forming processing, the thin and low-rigidity flat plate part is always pressed with a constant pressing force by the large diameter part. The action of the load is avoided and the occurrence of abnormal deformation and machining unevenness accompanying this, and the occurrence of breakage due to these are prevented.
In addition, since the flat plate portion is bent by a certain amount at the large diameter portion, the small diameter portion is brought into contact with the rib forming portion, so that no bending load is applied to the rib from the beginning of the bending process, and the rib collapses due to an excessive load. Such deformation is prevented.
As a result, the flat plate portion and the rib forming portion are bent and formed uniformly, and there is obtained a plate material with ribs of uniform quality with no processing unevenness and no processing defects such as bending.
[0040]
In addition, the above-described processing can be performed only by forming a ring-shaped large-diameter portion corresponding to the height of the rib forming portion and the thickness of the flat plate portion on the upper roll, so the upper roll and the lower roll at the time of processing Adjustment work such as adjustment of the related position and adjustment of the pressing force becomes unnecessary, and the number of work steps can be reduced.
[0041]
According to the third aspect of the present invention, the plate surface of the plate material is also inclined by arranging the pair of lower rolls so as to be inclined, and the forming pressing force applied to the plate material is higher than that in the prior art in which the plate surface of the plate material is horizontally arranged. Is reduced.
Thereby, generation | occurrence | production of the unusual deformation | transformation by the excessive pressing force of a flat plate part and generation | occurrence | production of the fall of the rib by the excessive pressing force acting on a rib formation part can be prevented.
[Brief description of the drawings]
FIG. 1 is a front view (AA arrow view in FIG. 2) at the time of bending forming a ribbed plate material using an upper roll according to an embodiment of the present invention.
FIG. 2 is a side view of a ribbed plate material and upper and lower rolls for molding in the embodiment.
FIG. 3 is a perspective view of a main part at the time of bending forming a ribbed plate material by an upper roll in the embodiment.
FIG. 4 is an external perspective view showing an example of a ribbed plate material.
5 is a BB arrow view of FIG.
FIG. 6 is an explanatory view showing a processing method of a ribbed plate material in the prior art.
FIG. 7 is a cross-sectional view of a rib surface bending forming state.
FIG. 8 is a cross-sectional view of a flat plate end bending forming state.
FIG. 9 is an external perspective view of a rib surface molding state by press bending.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Plate member 2 with a rib Flat plate part 3 Rib formation part 3a Rib 3b Upper end surface 10 Upper roll 10a Ring 10b Small diameter part 10d Roll main body 20 (20a, 20b) Lower roll

Claims (4)

A ribbed plate material in which a flat plate portion formed with a predetermined width and a rib forming portion in which a plurality of ribs such as grids and stripes are formed at a constant height on the flat plate In the method of forming a ribbed plate material that is pressed between two lower rolls that are paired with a roll and bent so that the rib side is on the bending inner peripheral side,
Forming at least two locations of the upper roll in a large diameter portion having a diameter larger than the small diameter portion of the other portion;
While pressing the flat plate portion of the plate material between the large diameter portion and the lower roll, bending the plate material by positioning the rib on the lower side of the small diameter portion ,
Furthermore, when the outer diameter of the large-diameter portion is pressed against the flat plate portion with the large-diameter portion, a small gap is formed between the small-diameter portion and the top surface of the rib before processing. A method for forming a ribbed plate material, comprising bending the small diameter portion and the top surface of the rib so as to contact each other.   2. The ribbed plate material according to claim 1, wherein the ribbed plate material is bent by making a diameter of the large diameter portion larger than a center distance (pitch) between the upper roll and the lower roll. Molding method.   2. The processing method for a ribbed plate according to claim 1, wherein one of the paired lower rolls is disposed such that the center thereof is positioned below the other lower roll, and the ribbed plate is set during processing. And forming the ribbed plate material by bending the plate material so that the plate material is inclined at a predetermined angle. A ribbed plate material in which a flat plate portion formed with a predetermined width and a rib forming portion in which a plurality of ribs such as grids and stripes are formed at a constant height on the flat plate In a molding apparatus for a plate material that is pressed between two lower rolls paired with a roll and is bent so that the rib side is on the bending inner peripheral side,
Than the small diameter portion of the other part at least two places of the upper roll is formed on the large larger diameter portion having a diameter, the large diameter portion, the outer peripheral surface contacts the flat portion of the ribbed plate, flat plate portion Is a ring part that can be pressed,
While pressing the flat plate portion of the plate material between the ring portion and the lower roll, bending the plate material by positioning the rib below the small diameter portion ,
Further, when the outer diameter of the ring portion is pressed against the flat plate portion with the large diameter portion, a minute gap is formed before processing between the small diameter portion and the top surface of the rib, and the bending portion is in the middle of bending. An apparatus for forming a plate material, characterized in that an outer diameter of a ring portion is set in accordance with a height of a rib forming portion and a thickness of a flat plate portion so that the small diameter portion and the top surface of the rib come into contact with each other.

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