JP2001038423A - Method of forming groove in metallic plate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To stably form a narrow groove in a metallic plate by forming a rough approximately U-sectioned groove having wider width than desired groove width and then forming a groove having the desired width by reducing the width of the rough groove, on the metallic plate. SOLUTION: As a raw material, a metallic plate 2 whose end portion is in advance pressed into an L-shaped section is used. With a rough die and a rough punch, rough groove 5 is formed at the end portion of the metallic plate 2. The rough groove 5 has groove width V and is a U-shaped groove having a high side wall 51 and a low side wall 52. A main body 21 is clamped with a cushion 71 and a die 72, and a corner 711 of the cushion 72 is brought into contact with the corner, at which at rough groove 5 and the main body 21 are connected. A control surface 721 of the die 72 is faced, at desired groove width W, to the inner surface of the high side wall 51. While the spacing between the punch 73 and the cushion 71 is maintained at the desired outer surface width of the groove 1, the punch 73 is moved in parallel from the base portion of the high side wall 51 toward the top end to form the groove 1 having the desired groove width W.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a method for forming a narrow groove by plastically processing a metal plate material.

[0002]

2. Description of the Related Art In recent years, with the miniaturization of products, the miniaturization of parts and the complexity of shapes are required. For example, in a metal plate material provided with a groove having a U-shaped cross section, there is a demand for reducing the groove width. Conventionally, when providing a groove in a metal plate,
Coining and bending were performed.

For example, as shown in FIG. 12, when a groove 1 having a substantially U-shaped cross section is formed at the end of a metal plate material 2 by coining, first, as shown by a dotted line in FIG. An L-shaped metal plate 2 is prepared. Next, as shown in the figure, a lower mold 91 corresponding to the lower surface shape of the groove 1 and a projection 9 corresponding to the groove width and groove depth of the groove 1 are formed.
The substantially L-shaped metal plate 2 is strongly clamped by the upper mold 92 having the 21 and compression-processed. As a result, the L-shaped portion of the substantially L-shaped metal plate 2 is coined into a desired substantially U-shaped groove 1.

In the case where the groove 1 is formed by bending at the end of the metal plate 2 as shown in FIG. 14, a metal plate 2 having a stepped portion 20 which is bent stepwise as shown in FIG. 15 is prepared. I do. Then, the step 20 is sandwiched between the lower mold 93 and the upper mold 94. The upper die 94 is provided with a projection 941 corresponding to a desired groove width and groove depth. Next, the end of the metal plate 2 is pushed up by the movable die 95 and is bent along the protrusion 941. Thereby, a desired substantially U-shaped groove 1 is obtained.

[0005]

However, the conventional coining and bending processes have the following problems.
That is, in the above-mentioned conventional processing method, it is necessary to use a mold having a projection corresponding to a desired groove width and groove depth. The projection has a narrower shape as the width of the desired groove is smaller. Therefore, as the demand for reducing the groove width becomes stricter, the rigidity of the projection decreases, and the projection is easily broken during processing. Therefore, it has been difficult to stably form grooves in the metal plate by the conventional processing method.

The present invention has been made in view of such a conventional problem, and an object of the present invention is to provide a groove forming method capable of stably forming a narrow groove on a metal plate.

[0007]

According to the first aspect of the present invention, there is provided a method of forming a groove by plastically deforming a metal plate, wherein the metal plate has a substantially U-shaped cross section having a groove width wider than a desired groove width. There is provided a method for forming a groove in a metal plate material, wherein a groove having a desired groove width is formed by forming a rough groove and then performing a width shifting process for reducing the groove width of the rough groove.

The most remarkable point in the present invention is that instead of directly forming a groove having a desired groove width, a rough groove having the above-mentioned wide groove width is formed in advance, and thereafter, the above-mentioned width shifting processing is performed. That is, a desired groove is formed.

Next, the operation and effect of the present invention will be described.
In the present invention, first, the rough grooves are formed in the metal plate material. Various conventional methods can be used for forming the rough grooves. For example, coining and bending similar to those in the related art can be used. In this case,
The groove width of the coarse groove can be made larger than the desired groove width,
The life of the tool can be greatly improved. Therefore, rough groove formation can be performed stably.

Next, in the present invention, the above-mentioned rough groove is subjected to the above-mentioned width shifting processing. This width shifting process is not a process of changing the basic shape of the rough groove, but a process of deforming so as to reduce the groove width. Therefore, there is no need to use a tool having projections corresponding to desired groove widths and groove depths as in the related art. Therefore, it is not necessary to consider the service life of the tool so much, and the above-mentioned width shifting can be stably performed. Therefore, by using the groove forming method of the present invention, even a groove having a very narrow groove width can be stably formed on a metal plate material.

Next, as in the second aspect of the present invention, the width shifting process includes a protrusion having a width corresponding to a desired groove width and a shape having a length shorter than a desired groove depth. It is preferable to perform the operation in a state where the tool is arranged in the opening of the rough groove. In this case, the groove width to be obtained can be finished with high accuracy due to the presence of the projection tool.

The rough groove is a U-shaped groove having a high side wall and a low side wall having different heights, and the low side wall is substantially perpendicular to the U-shaped groove. In the case where the main body portion of the metal plate material disposed on the lower surface is extended, a first tool having a corner portion capable of contacting both the outer surface of the lower side wall and the main body portion, A second tool having a regulating surface facing the inner surface and regulating the deformation position of the high side wall and having a contact surface capable of contacting the main body is used, and the first tool and the second tool use the second tool. Hold the main body,
It is preferable to perform the width shifting process by pressing an outer surface of the high side wall inward with a tool.

In this case, the first tool and the second tool use the main body, the first tool and the third tool use the outer surfaces of both side walls of the groove, and the second tool and the third tool use the high side wall. Can be carried out in a state where they are sandwiched. For this reason, it is possible to perform the width shifting processing with high accuracy.

Further, according to the present invention, the second
It is preferable that the tool is provided with a projection having a width corresponding to a desired groove width and a length shorter than the desired groove depth so as to be arranged at the opening of the rough groove. In this case, the groove width to be obtained can be finished with higher accuracy due to the presence of the protrusion.

According to a fifth aspect of the present invention, in the width shifting process, the third tool and the second tool are relatively translated in a direction along the high side wall. It is preferable to perform ironing on the high side wall with a tool. In this case, since ironing is performed on the high side wall, the shape and dimensional accuracy of the high side wall can be further improved.

According to a sixth aspect of the present invention, the rough groove is a U-shaped groove having side walls having substantially the same height, and is disposed substantially perpendicularly to the both side walls. In the case where the main body of the metal plate is extended, both side walls of the rough groove are sandwiched between the first tool and the second tool from the outside, and face the first tool and the second tool. It is preferable that the width adjustment processing is performed by disposing the third tool as described above, sandwiching the main body portion therebetween, and advancing the first tool toward the second tool. In this case, since the main body is sandwiched between the first tool and the second tool and the third tool, it is possible to accurately perform the width shifting processing without deforming the main body. it can.

Further, according to the invention of claim 7, the third
It is preferable that the tool is provided with a projection having a width corresponding to a desired groove width and a length shorter than the desired groove depth so as to be arranged at the opening of the rough groove. In this case, the groove width to be obtained can be finished with higher accuracy due to the presence of the protrusion.

Further, as in the eighth aspect of the present invention, the first
The tool is preferably provided with a cam structure for converting the stress received in the vertical direction into the horizontal direction. In this case,
When using a press machine, the arrangement and fixation of the tools can be facilitated.

According to a ninth aspect of the present invention, when the groove width of the rough groove is wider than the thickness of the metal plate and the desired groove width is smaller than the pressure of the metal plate. In particular, the above effects can be effectively exhibited.

[0020]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 A method for forming a groove in a metal plate according to an embodiment of the present invention will be described with reference to FIGS. In this example,
As shown in FIG. 3, this is a method of forming a groove 1 having a substantially U-shaped cross section by plastically deforming an end of a flat metal plate material 2.
In this example, as shown in FIGS. 1 and 2, a rough groove 5 having a substantially U-shaped cross section having a groove width larger than a desired groove width is formed in the metal plate material 2 and then the groove of the rough groove 5 is formed. The groove 1 having a desired groove width W is formed by performing width shifting processing for reducing the width V. In this example, the groove width W is smaller than the thickness T of the metal plate 2. The details are described below.

First, as shown in FIG. 1 (a), a metal plate material 2 whose end portion is previously pressed into an L-shaped cross section is used as a raw material. 1 (a) to FIG.
As shown in (c), the rough groove 5 is press-formed using the rough die 81 and the rough punch 82. As shown in the figure, the rough die 81 has a concave portion 8 for determining the size of the rough groove 5 on the outer surface side.
It has ten. The rough punch 82 has a projection 821 for determining the groove width V and the groove depth D of the rough groove 5. The thickness (V) of the projection 821 is provided to be larger than the thickness T of the metal plate 2.

As shown in FIG. 1 (c), the rough groove 5 is formed at the end of the metal plate material 2 by press working using the rough die 81 and the rough punch 82. Further, as shown in the figure, the obtained rough groove 5 becomes a U-shaped groove having side walls having different heights, that is, a high side wall 51 having a high height and a low side wall 52 having a low height. Then, the main body portion 21 of the metal plate material 2 arranged substantially perpendicularly to the low side wall 52 is extended. In this example, the above-described press working was performed using a press 6 (FIG. 4) described later.

Next, the above rough groove is subjected to width shifting processing. In this example, the following three tools are combined. As shown in FIG. 2A, the first tool includes a low side wall 52.
A cushion 71 having a corner portion 711 that can abut both the outer surface and the body portion 21 is used. As the second tool, a die 72 having a regulating surface 721 facing the inner surface of the high side wall 51 to regulate the deformation position of the high side wall 51 and having a contact surface 722 capable of contacting the main body 21 was used. . As the third tool, a punch 73 having a rounded tip was used.

Then, as shown in FIG.
The main body 21 is sandwiched between the cushion 71 and the die 72. At this time, the corner 711 of the cushion 71 is
And the corner where the body part is connected. As a result, the corner 711 of the cushion 71 comes into contact with both the low side wall 52 of the rough groove and the main body 21. The die 72 has its contact surface 722 in contact with the main body portion 21 to hold it, and the regulating surface 21 has the high side wall 51.
Face the inside of At this time, the position of the regulating surface 21 is
It is set according to a desired groove width W.

Next, as shown in FIGS. 2B and 2C, the punch 73 is relatively translated along the direction from the base end to the upper end of the high side wall 51. At this time, the position of the punch 73 is always maintained such that the interval between the punch 73 and the cushion 71 becomes a size corresponding to the desired width of the outer surface of the groove 1.
As a result, as shown in FIG. 2B, the outer surface of the high side wall 51 of the rough groove 5 is pressed inward, and the width shifting process proceeds. At this time, ironing is applied to the high side wall 51 between the die 71 and the punch 73. And
Finally, as shown in FIG. 2C, a groove 1 having a desired groove width W is formed.

Further, the width adjusting process of the present embodiment was performed using a press machine 6 as shown in FIG. The press 6 has an upper mold setting section 61 and a lower mold setting section 62, and is configured to move up and down the upper mold setting section 61. In this example, the die 72 as the second tool is set in the upper die setting section 61, and the punch 73 as the third tool is set in the lower die setting section 62. In addition, the cushion 71 as the first tool is set above a spring (not shown) set in the lower die setting portion 62.

In this setting state, by lowering the upper mold set portion 61, first, the cushion 7
1 and the die 72 sandwich the metal plate material 2 in the rough groove 5. Further, by lowering the upper mold set portion 61, the punch 73 moves upward and parallel to the metal plate 2. As a result, as described above,
Width adjustment with ironing is performed.

Next, the operation and effect of this embodiment will be described. In this example, as described above, first, the rough groove 5 is formed in the metal plate 2. The rough groove is formed using the same tool as in the conventional groove forming method. In this case, as described above, the projection 821 of the rough punch 82 has
Has a thickness (V) larger than the thickness T of the metal plate 2. Therefore, the rigidity of the projection 821 can be increased, and the life of the rough punch 82 can be greatly improved. Therefore, the rough groove 5 can be formed without considering the tool life much.

The width shifting process for the rough groove 5 is not a process for changing the basic shape of the rough groove 5 but a process for deforming the rough groove 5 so as to reduce the groove width W. Therefore, there is no need to use a tool having projections corresponding to the desired groove width W and groove depth D as in the related art. Therefore, even in this width shifting processing, it is not necessary to consider the life of the tool so much, and the processing can be stably performed.

Therefore, if the groove forming method of this embodiment is used, even if the groove 1 has a groove width W smaller than the plate thickness T of the metal plate 2, it can be formed stably on the metal plate 2. . Further, in this example, ironing can be applied to the high side wall 51 at the time of the width shifting. Therefore, the shape and dimensional accuracy of the high side wall 51 can be further improved.

Embodiment 2 The present embodiment relates to a die 7 as a second tool in Embodiment 1.
2 is an example in which the shape of FIG. That is, as shown in FIG. 5, the die 72 of this example is provided with a projection 725 having a width corresponding to a desired groove width W and a length shorter than the desired groove depth. It was provided so as to be arranged in the opening. Others are the same as the first embodiment.

In this case, the presence of the projections 725 can reliably prevent the groove width from becoming too narrower than the desired groove width W. Therefore, the accuracy of the groove width W to be obtained can be further improved. Otherwise, the same operation and effect as those of the first embodiment can be obtained.

Embodiment 3 In this embodiment, as shown in FIG. 6, a groove 1 having a U-shaped cross section is formed at the inner peripheral end of a ring-shaped metal plate 2. This groove 1 also has a groove width W smaller than the plate thickness T of the metal plate 2.

In this case, the tool in the first embodiment has a ring shape or a column shape. Specifically, when forming the rough groove, the rough die 81 and the rough punch 82 are formed in a ring shape. Further, the cushion 71 and the die 72 are formed into a ring shape at the time of width shifting processing,
3 is cylindrical. Thereby, similarly to the first embodiment, the groove can be stably formed.

FIG. 7 shows an example in which a groove 1 having a U-shaped cross section is formed at the inner peripheral end of a ring-shaped metal plate material 2 and a groove 1 having a U-shaped cross section is also provided at the outer peripheral end. Is shown. In this case, both the inner circumferential groove 1 and the outer circumferential groove 1 can be formed stably in the same manner as described above. Also, the two grooves 1 on the inner and outer circumferences can be formed simultaneously,
They can be molded separately.

Fourth Embodiment As shown in FIG. 8, this embodiment is an example in which the relative movement of the punch 73 is reversed up and down in the width shifting process in the first embodiment. That is, in this example, as shown in FIG. 8A, the punch 73 was arranged upside down as in the case of the first embodiment, and was set in the upper die setting section 61 of the press machine 6. In addition, the cushion 71 is provided with the lower mold set portion 62 of the press machine 6.
And the die 72 is set below the spring (not shown) set in the upper die setting section 61. In this state, by lowering the upper air upper mold set portion 61, first, the rough groove 5 is
The metal plate material 2 having the above is sandwiched. Further, by lowering the upper air upper mold set portion 61, the punch 73 relatively moves vertically in parallel. As a result, width shifting with ironing is performed.

That is, the metal plate 2 provided with the rough grooves 5 was subjected to width shifting as shown in FIGS. Specifically, as shown in FIGS. 7A and 7B, the punch 73 is relatively translated from the opening side of the rough groove 5 in the direction from the upper end of the high side wall 51 to the base end.
At this time, the position of the punch 73 is always maintained such that the interval between the punch 73 and the cushion 71 becomes a size corresponding to the desired width of the outer surface of the groove 1. As a result, the outer surface of the high side wall 51 of the rough groove 5 is pressed inward as shown in FIG. At this time, ironing is applied to the high side wall 5 between the die 71 and the punch 73. Finally, as shown in FIG.
A groove 1 having a desired groove width W is formed.

As described above, even when the relative movement of the punch 73 is set in the opposite direction to that of the first embodiment, it is possible to perform stable width shifting processing. Otherwise, the same operation and effect as those of the first embodiment can be obtained.

Fifth Embodiment As shown in FIG. 9, this embodiment is an example in which a groove 1 having a substantially U-shaped cross section is formed linearly in the middle of a flat metal plate 2. The groove width W of the groove 1 was also made smaller than the plate thickness T of the metal plate 2.

In forming the groove 1, a rough groove 5 was previously formed in the same manner as described above. The formation of the rough groove 5 is shown in FIG.
As shown in (a), a flat metal plate material 2 having a thickness T was used as a material. For this metal plate material 2, FIG.
(A) As shown in (b), the rough die 85 and the rough punch 86
Is used to press-form the rough groove 5.

As shown in FIG.
Has a concave portion 850 for determining the size of the outer surface side of the. The rough punch 86 has a protrusion 861 for determining the groove width V and the groove depth D of the rough groove 5. The thickness (V) of the protrusion 861 is provided to be larger than the thickness T of the metal plate 2.

By pressing using such a rough die 85 and a rough punch 86, as shown in FIG.
A rough groove 5 is formed in the metal plate 2. The obtained rough groove 5 is a U-shaped groove having side walls 53 having substantially the same height as shown in FIG. The two side walls 53 are provided with the main body 2 of the metal plate material arranged substantially perpendicular thereto.
1 is extended.

Next, the above rough grooves are subjected to width shifting processing. In this example, the following four tools are combined. As shown in FIG. 11A, both side walls 53 of the rough groove 5 are sandwiched from outside by a slide die 74 as a first tool and a fixed die 75 as a second tool. Then, a holding mold 76 is arranged as a third tool so as to face the first tool and the second tool, and the body 21 is sandwiched between them.

The slide die 74 is provided so as to be movable in the horizontal direction. The slide die 74 has a corner 741 that can contact the main body 21 and the side wall 53, and a step 742 that can contact the end of the metal plate 2. The rear end of the slide die 74 has a cam surface 745. The cam surface 745 is configured to abut a cam surface 775 provided at the tip of a punch 77 as a fourth tool described later.

The punch 77 as the fourth tool is disposed so as to be able to move up and down in the vertical direction, and when it is moved forward, its cam surface 775 causes the cam surface 745 of the slide die 74 to move.
, And the vertical movement of the punch 77 is converted into the horizontal movement of the slide die 74.

In this example, as shown in FIG. 11A, the punch 77 is set in the upper die setting section 61 of the press machine 6, and the slide die 74 and the fixed die 75 are set in the lower die set of the press machine 6. Set in the section 62. In addition, holding type 7
6 is set on the lower side of a spring (not shown) set on the upper die setting section 61.

In this state, the upper die setting section 61
First, the slide die 74,
The metal plate 2 having the rough groove 5 is sandwiched by the fixing die 75 and the pressing mold 76. Further, by lowering the upper mold set portion 61, the punch 77 relatively moves vertically in parallel. The lowered punch 77 presses the cam surface 745 of the slide die 74 with the cam surface 775 at the tip thereof, and advances the slide die 74 in the horizontal direction.

As the slide die 74 advances, the corners 741 press the side walls of the rough groove 5. At this time, the end of the metal plate 2 is also pressed by the step 742 of the slide die 74. As a result, the width adjustment processing to the rough groove 5 is performed very smoothly and stably.

As described above, even when the groove 1 having a substantially U-shaped cross section with a narrow groove width is formed in the middle of the flat metal plate material 2, a tool having a projection having a width corresponding to a desired groove width W is required. There is no need to use any. Therefore, it can be performed very stably without considering the tool life much.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing a process of forming a rough groove in a first embodiment.

FIG. 2 is an explanatory diagram showing a process of width shifting processing in the first embodiment.

FIG. 3 is a perspective view of a metal plate material having a groove according to the first embodiment.

FIG. 4 is an explanatory view showing a press machine according to the first embodiment.

FIG. 5 is an explanatory view showing a tool shape for width shifting processing in a second embodiment.

FIG. 6 is a partially cutaway perspective view of a ring-shaped metal plate having a groove in a third embodiment.

FIG. 7 is a partially cutaway perspective view of another example of a ring-shaped metal plate having a groove in the third embodiment.

FIG. 8 is an explanatory view showing a process of width shifting processing in a fourth embodiment.

FIG. 9 is a perspective view of a metal plate material having a groove according to a fifth embodiment.

FIG. 10 is an explanatory view showing a process of forming a rough groove in a fifth embodiment.

FIG. 11 is an explanatory diagram showing a process of width shifting processing in the fifth embodiment.

FIG. 12 is a perspective view of a metal plate having grooves in a conventional example.

FIG. 13 is an explanatory view showing a groove forming method by coining in a conventional example.

FIG. 14 is a perspective view of a metal plate having grooves in a conventional example.

FIG. 15 is an explanatory view showing a groove forming method by bending in a conventional example.

[Explanation of symbols]

 1. . . Groove, 2. . . Metal plate material, 21. . . Main body, 5. . . Rough groove, 51. . . High side wall, 52. . . Low side wall, 53. . . Sidewall, 71. . . Cushion (first tool), 72. . . Die (second tool), 73. . . Punch (third tool), 725. . . protrusion,

Claims (9)

[Claims] 1. A method of forming a groove by plastically deforming a metal plate material, wherein a rough groove having a substantially U-shaped cross section having a groove width larger than a desired groove width is formed in the metal plate material. A method for forming a groove in a metal plate material, wherein a groove having a desired groove width is formed by performing a width shifting process for reducing a groove width of the rough groove. 2. The method according to claim 1, wherein
A metal plate material wherein a projection tool having a projection having a width corresponding to a desired groove width and having a length shorter than a desired groove depth is arranged in the opening of the rough groove. Groove forming method. 3. The rough groove according to claim 1 or 2,
A U-shaped groove having a high side wall and a low side wall having different heights, and the low side wall is formed by extending a main body of the metal plate material arranged substantially perpendicularly to the low side wall; A first tool having a corner portion capable of coming into contact with both the outer surface of the side wall and the main body; a regulating surface facing the inner surface of the high side wall and restricting a deformation position of the high side wall; Using a second tool having an abutting surface capable of abutting on the body, sandwiching the main body between the first tool and the second tool, and pressing an outer surface of the high side wall inward with a third tool. Forming a groove in a metal plate material by performing the above-mentioned width shifting process. 4. The method according to claim 3, wherein the second tool includes:
A metal plate material, wherein a projection having a width corresponding to a desired groove width and having a length shorter than a desired groove depth is provided at the opening of the rough groove. Groove forming method. 5. The method according to claim 3, wherein the width adjusting process is performed by relatively moving the third tool in a direction along the high side wall so that the third tool and the second tool are moved in parallel. A method of forming a groove in a metal plate material, while performing ironing on the high side wall. 6. The rough groove according to claim 1 or 2,
A U-shaped groove having side walls having substantially the same height, and a main body portion of the metal plate material disposed substantially perpendicular to the U-shaped groove extends on both of the side walls. Between the first tool and the second tool from outside,
A third tool is disposed so as to face the first tool and the second tool, the main body is sandwiched between the third tool and the first tool, and the first tool is advanced toward the second tool. A method for forming a groove in a metal plate material, comprising performing an alignment process. 7. The method according to claim 6, wherein the third tool includes:
A metal plate material, wherein a projection having a width corresponding to a desired groove width and having a length shorter than a desired groove depth is provided at the opening of the rough groove. Groove forming method. 8. The method according to claim 6, wherein the first tool is provided with a cam structure for converting a stress received in a vertical direction into a horizontal direction. 9. The method according to claim 1, wherein:
A method of forming a groove in a metal plate material, wherein the groove width of the rough groove is wider than the thickness of the metal plate material, and the desired groove width is smaller than the pressure of the metal plate material.