JP2008137105A - Sheet metal working method and sheet metal article produced thereby - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide new metal working technology for producing an article inexpensively by suppressing the number of parts to the minimum extent and reducing man-hour of manufacture and forming an angle part with high precision. <P>SOLUTION: This article 1 produced by working sheet metal is manufactured by forming cut-out grooves 4, 4 having a depth being equivalent to 1/3 of the thickness of a metallic sheet 11 along two folding lines being parallel across a predetermined interval on an outer surface 12 of the metallic sheet 11, bending the metallic sheet by 90° in such a way that each cut-out groove 4, 4 is bent in a chevron shape and each part agreeing with an inner surface 15 side of each cut-out groove 4, 4 is bent in a trough shape, then applying welding to form a padding part including a vertical angle of 90° in each cut-out groove 4, 4, and cutting off each welded padding part W3, W3 in such a way that each outer surface of the metallic sheet on both sides of a bent section becomes the same face as a plane to which each outer surface belongs, respectively, to form a substantially close apex part. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

    This invention has all fields related to sheet metal processing as its technical field, and in particular, the field related to the forming technology of metal plate bending corners by bending processing, manufacturing and sales of processed and processed products, From the field of providing or selling technologies, equipment, and tools required for use, etc., materials required for those materials, machinery and parts, such as wood, stone, various fibers, plastics, various metal materials, etc. , The electronic components incorporated in them, the field of control-related equipment that integrates them, the field of various measuring instruments, the field of power equipment that moves the equipment and instruments, the electricity that is the energy and the electricity that is the energy source In addition, the field generally referred to as industrial machinery, such as the field of oil, as well as testing and researching these facilities and equipment, and exhibiting, selling, and transporting them Fields related to entering, generals, the results of their use, equipment for making them, fields related to the collection and transportation of garbage debris generated by the operation of equipment, and efficient reuse of these garbage debris There are no technical fields that are not related to the recycling field and other new fields that cannot be envisaged at this time.

(Points of interest)
Various processing methods such as casting, cutting, hot forging, and press molding (including cold forging) are generally used in the technology for manufacturing metal parts, depending on the purpose and required performance of the parts. Although it will be selected appropriately from these processing methods, except when manufacturing ultra-precision parts and high-strength parts, man-hours can be reduced by cutting and molding standardized metal plates and metal bars. A wide range of manufacturing methods are used to reduce the price of products by selecting press molding and sheet metal processing that can reduce and ensure excellent appearance and dimensional accuracy and stable quality. .

    However, in general press work or sheet metal work, the cross section of the processed parts 1 corners 2 and 2 formed by bending is an arc shape as shown in the side view of the press-formed product in FIG. Therefore, it has the disadvantage that it is very difficult to mold into a corner cross-sectional shape where the flat plate surfaces of the metal plate after bending intersect at the apex. When processing products without R-surface finish, it is generally necessary to perform cutting with the disadvantage of increasing man-hours and generating a large amount of processing waste, which increases the manufacturing cost. It was.

    In order to overcome such drawbacks of press molding and cutting, for example, a perspective view of a temporarily assembled metal plate shown in FIG. 9, a side view of a welded processed part shown in FIG. 10, and a cut finished processed part shown in FIG. As shown in the side view of FIG. 1, one rectangular base plate 3 cut from a ready-made metal plate to a predetermined size, and two walls of a predetermined height cut from the ready-made metal plate so as to have the same length as the base plate 3 As shown in FIG. 9, after forming the inclined surface-like chamfered portions 32, 32 at the corners over the entire length outside the lower edge of each wall plate 31, 31, as shown in FIG. 9, The wall plates 31 and 31 are combined at right angles along both end edges parallel to the longitudinal direction of the base plate 3, and the front and back of each joint portion are in a plurality of appropriate positions while maintaining the upright posture. Are temporarily fixed and welded along the inside of the corners 2 and 2, as shown in FIG. The welded portions W1 and W1 are welded so as to fill the chamfered portions 32 and 32 on the outer sides of the corner portions 2 and 2, and the welded portion W1 protruding from the chamfered portions 32 and 32 as shown in FIG. , W1 is cut into a planar shape by cutting, and the corners 2 and 2 are finished at a right angle θ, so that the cost can be greatly reduced compared to that produced by cutting alone, so-called square channel 1 Is being made.

    In addition, even in the manufacture of the square pipe 5 having the cross section of the square shape, it is still necessary to cost considerably for the squaring process, and in order to overcome this, the temporarily assembled plate material of FIG. As shown in the perspective view, the side view of the welded processed part of FIG. 13, and the side view of the machined processed part of FIG. 14, a rectangular base plate 3 cut from a ready-made metal plate to a predetermined size. In addition, the lid plate 33 having the same shape and the two wall plates 31 and 31 having a predetermined height cut out from the ready-made metal plate so as to be set to the same length are manufactured. After chamfering portions 32, 32,... Are formed by cutting the outer sides of the upper and lower end edges over the entire length to be joined to the plate 3 and the cover plate 33 into inclined surfaces, as shown in FIG. The outer surface of the plate 33 and the wall plates 31 and 31 have a cross-sectional shape of a mouth shape At the same time, as shown in FIG. 13, the four corners were cut out in a fan shape, each four-sided wall was fitted with a diaphragm 34 that can be regulated from the inside, and further, the inside corners were regulated at 90 °. Since the rectangular bar-shaped backing metal 35, 35,... Having a peripheral wall surface are joined and arranged along the longitudinal direction, as shown in FIG. The chamfered portions 32, 32,... Of the wall plates 31, 31 arranged outside the backing metal 35, 35,... Are welded with W1, W1,. The end edges of the base plate 3 and the cover plate 33 are welded and integrated together with the backing metal 35, 35,..., And further protrude outward from the chamfered portions 32, 32,. The welded parts W1, W1,. As shown in FIG. 14, a processing method has been adopted in which the outer surfaces of the wall plates 31, 31 are cut into a flat and smooth surface and subjected to chamfering.

    However, although the former squaring channel 1 shown in FIGS. 9 to 11 can sufficiently secure the accuracy of each corner portion by cutting, as is apparent from FIG. A result of leaving an unwelded portion Z that remains separated without being welded between the contact end of the wall plates 31, 31 disposed between the welded portion W <b> 2 and the contact surface wall of the base plate 3; As a result, a sufficient strength corresponding to the thickness of the material could not be secured and the durability was inferior.

    Also, the latter square pipe 5 shown in FIG. 12 to FIG. 14 is welded over the entire thickness of the joint portions, near the corner portions 2, 2,... In order to prevent the occurrence of distortion, the backing metal 35, 35,..., The diaphragm 34, etc. must be attached, which increases the number of parts, man-hours, weight, etc., and increases the manufacturing cost. It had a fatal disadvantage that it would be expensive.

(Conventional technology)
Further, as a technique applicable to the manufacture of the square channel 1 and the square pipe 5 having the cross section of the mouth shape, for example, the one disclosed in the "pipe material raised portion forming method" invention of JP-A-7-124654. In addition, the pipe material is pressed and deformed by a die surface of a pressing die that fits and holds the substantially half circumferential surface of the pipe material to the holding mold and enters and exits at another angle toward the other half circumferential surface of the pipe material protruding from the holding mold, There is one in which a raised portion is formed on the mold surface of the stamping die and a ridge line of the raised portion is cut off so that the ridge line portion formed on the pipe material can be sharply formed.

    Also, as proposed in Japanese Patent Application Laid-Open No. 2006-264177, "Right-angle 2-sided correction grinding device", the both ends of the square material to be processed are gripped by the gripping member, and transferred by the movement of the feeding vehicle, Two adjacent surfaces of this transported square are cut with a pair of disc blades combined in a V shape to obtain two right-angled surfaces from which distortion has been removed. The posture of the square bar is determined so as to coincide with the vertical line, and a square bar posture determining means for holding the square bar in this state is attached, and each of the pair of disk blades corresponds to two adjacent upper surfaces of the transfer square bar. In addition, as a right-angled two-face correction grinder arranged in an inverted V shape with an included angle of 90 degrees, it is possible to accurately and efficiently position the square material, and to move the posture determining means up and down, Some have made it possible to adjust

    Then, as in the “four-sided right angle grinding machine” disclosed in Japanese Patent Application Laid-Open No. 2000-334645, the work is rotated by a work chuck mechanism comprising a pair of a fixed side support unit and a moving side support unit. A workpiece receiving frame member that is held in a horizontal direction freely and is ground by a disk-shaped grindstone that rotates the upper surface of the workpiece, and the chuck mechanism is provided in a direction perpendicular to a rotating shaft attached in the horizontal direction. , A rotating shaft drive motor, a coupling member, a rotation stop mechanism for the rotating shaft, and a fixed support unit having a transmission mechanism for transmitting the rotation driving of the rotating shaft to the coupling member, and the work receiving frame member in the horizontal direction. The sliding mechanism to be moved, the coupling member engaged with the coupling member of the fixed side support unit, and the rotational driving force received by the coupling member are fixed to the work receiving frame member. It is composed of a moving side support unit having a transmission mechanism that transmits in the same direction and at the same rotational speed as the work receiving frame member of the side support unit, and the work can be rotated batchwise without being eccentric. There are some known techniques of this kind, such as those that can be held freely in the horizontal direction.

The former `` pipe material bulge forming method '' invention is basically to form a bulge by press molding, and even if sharp cornering is possible, its corner shape is naturally limited, It is considered that it is impossible to perform precise cornering as obtained by cutting, and the following “right-sided two-side correction grinder” invention and the latter “four-sided” are considered. Any of the inventions of the “right angle grinding machine” can be applied to the production of the square channel 1 shown in FIGS. 9 to 11 and the square pipe 5 having a mouth-shaped cross section shown in FIGS. Although it is possible to improve the efficiency of the cornering work, the base plate 3, the wall plate 31, the chamfered portion 32, the cover plate 33, the diaphragm 34, and the backing metal 35 as shown in FIGS. Use many parts such as It had a fatal defect that does not lead to overcome a fundamental inefficient production form of must.
(1) JP 2006-264177 A (2) JP 2000-334645 A (3) JP 7-124654 A

(Awareness of problems)
As described above, all of the previously proposed “pipe material raised portion forming method”, “right-angle two-surface correction grinding device”, “four-surface right-angle grinding device”, etc. Although it can be applied to the production of the square pipe 5 having a cross-section of the square shape, the press-formed product 1 in FIG. 8 is changed to a cylindrical pipe material or a rectangular pipe material, and the former “pipe material raised portion forming method” Is applied, it is not possible to perform a chamfering process that forms a straight ridge line without cutting the arc-shaped cross-sectional shape of the corners 2 and 2 of the press-formed product 1. Even when machining is added, the increase in plate thickness and cutting allowance cannot be avoided, resulting in the disadvantage of increasing manufacturing man-hours and waste of materials. Square out channel 1 and Fig. 12 14 When the square pipe 5 with the cross-sectional shape shown in FIG. 14 is manufactured by applying the “right-angle 2-side correction grinder” or the latter “4-face right-angle grinding machine”, it is possible to produce a square with high accuracy. However, manufacturing that integrates parts such as the base plate 3, the wall plate 31, the chamfered portion 32, the cover plate 33, the diaphragm 34, and the backing metal 35 by welding is compared to a bent product by press working. As a result, the number of parts is large and it is difficult to reduce the number of manufacturing steps and production costs.

(Object of invention)
Therefore, the present invention cannot develop a new metal processing technology that can minimize the number of parts, reduce the number of manufacturing steps, can be produced at low cost, and realizes and enables high-accuracy chamfering. From the judgment of whether or not it was, we started development and research very quickly, and as a result of repeating trial and error over many years and many trial productions and experiments, this time, finally, a new sheet metal processing method and a new structure resulting therefrom The present invention has succeeded in realizing a sheet metal processed product, and hereinafter, the configuration thereof will be described in detail together with an embodiment representing the present invention shown in the drawings.

(Structure of the invention)
As can be clearly understood from the embodiments representing the present invention shown in the drawings, the sheet metal working method of the present invention basically comprises the following configuration.
That is, a notch groove having a predetermined depth is formed on the outer surface of the metal plate along a desired bending line, and the notch groove portion is mountain-folded so that the inner surface of the notch groove coincides with the gap. After bending so that the location is a corner of a predetermined angle or a valley fold close to the corner, include a virtual apex angle of a predetermined angle formed by planes to which the outer surfaces of each metal plate on both sides of the bending location belong. The notch groove is subjected to a build-up process by welding of the same metal or a metal excellent in weldability, and the weld build-up part is formed on each metal on both sides of the bending process place. A sheet metal working method having a gist of a configuration in which a solid top portion having a predetermined angle is formed by cutting each surface so as to be flush with a plane to which a plate outer surface belongs.

    More specifically, the sheet metal processing method comprising this basic configuration is cut on the outer surface of the metal plate at a depth corresponding to 1/3 of the thickness of the metal plate along the desired folding line. Form a notch groove, and bend the notch groove part so that the portion where the inner surface of the notch groove coincides with the corner is a right angle corner or a valley fold near the corner. After making it L-shaped, the notch groove is made of the same metal or weldable so as to include a virtual apex angle of 90 ° formed by planes to which the outer surfaces of the metal plates on both sides of the bent portion belong. In addition, the welded portion of either one of the excellent metals is welded, and the welded portion is cut out to be flush with the plane to which the outer surface of each metal plate on both sides of the bent portion belongs. Thus, a sheet metal working method having a configuration in which a solid right-angled apex portion is formed is obtained.

    In these sheet metal working methods, a plurality of metal sheets having a depth corresponding to 1/3 of the thickness of the metal sheet along a plurality of desired folding lines parallel to the outer surface of the metal sheet at a predetermined interval. Form notch grooves, and bend the notch grooves so that the part where the inner surface of the notch groove coincides with the corner is a corner of a predetermined angle or a valley fold near the corner. After forming a polygonal groove shape, each notch groove is made of the same metal so as to include a predetermined vertical angle formed by planes to which the outer surfaces of the metal plates on both sides of each bending portion belong. After performing the build-up process by welding of either metal made or excellent in weldability, the weld build-up part is defined as a plane to which the outer surface of each metal plate on both sides of each bending position belongs. Cut to be flush with each other to form a solid top with a predetermined angle Sheet Metal working method and the like.

    More specifically, the depth corresponding to 1/3 of the thickness of the metal plate along two desired folding lines parallel to the outer surface of the metal plate at a predetermined interval. The two notch grooves are formed, and the notch groove portions are mountain-folded so that the inner surface of the notch groove has a right-angle corner or a valley fold near the corner. After bending into a U-shaped cross-section or a cross-sectional shape similar to it, including a virtual apex angle of 90 ° composed of planes to which the outer surfaces of the metal plates on both sides of each bending portion belong, Each notch groove was subjected to build-up processing by welding of either the same metal or a metal excellent in weldability, and then the weld build-up portion was placed on each side of each bending process. Solid right angles by cutting them so that they are flush with the plane to which the outer surface of the metal plate belongs. Part can be said that the structure sheet metal processing method which is adapted to form a.

    Furthermore, the sheet metal processing method of the present invention has a depth corresponding to 1/3 of the thickness of the metal plate along two desired bending lines parallel to the outer surface of the metal plate at a predetermined interval. The two notch grooves are formed, and the notch groove portions are mountain-folded so that the inner surface of the notch groove has a right-angle corner or a valley fold near the corner. After bending into a U-shaped cross-section or a cross-sectional shape similar to it, including a virtual apex angle of 90 ° composed of planes to which the outer surfaces of the metal plates on both sides of each bending portion belong, Each notch groove was subjected to build-up processing by welding of either the same metal or a metal excellent in weldability, and then the weld build-up portion was placed on each side of each bending process. Densely cut out to be flush with the plane to which the outer surface of the metal plate belongs. After forming a square apex portion to form a groove-shaped member, each pair of the grooves is processed into an abutting edge portion in which the outer surface is notched at the edge of each web, and each groove portion is then processed. Are opposed to each other and the abutting edges are abutted with each other by forming a web arrangement in which the sum of the opposite web width dimensions is the same. After the groove portion to be formed is welded by welding of either the same metal or a metal excellent in weldability, the welded overlay portion is defined as a plane to which each outer surface of the web belongs. It includes a sheet metal working method comprising a configuration in which the same surface is cut out to form a rectangular cross section.

(Related invention)
In relation to the above-described sheet metal processing method, the present invention also includes a sheet metal processed product manufactured by them.
That is, according to the most basic sheet metal processing method of the present invention, a notch groove having a predetermined depth is formed on the outer surface of the metal plate along a desired bending line, and the notch groove portion is fold-folded. Then, after bending the inner surface of the notch groove so that the portion where the wrinkles coincide with each other is a corner of a predetermined angle or a valley fold near the corner, the plane to which the outer surface of each metal plate on both sides of the bent portion belongs The notch groove is built up by welding so as to include a predetermined vertical vertices constituted by each other, and the welded build-up portion is flush with the plane to which each metal plate outer surface on both sides of the bending portion belongs. The sheet metal processed product is characterized by a structure in which a solid top portion having a predetermined angle is formed by cutting each of them.

    More specifically, a notch groove having a depth corresponding to 1/3 of the thickness of the metal plate along the desired bending line is formed on the outer surface of the metal plate. In the mountain fold, the inner surface of the notch groove is bent so that the portion where the flank coincides is a right-angled corner or a valley fold close to the corner. The notch groove was built up by welding so as to include a virtual apex angle of 90 ° formed by the planes to which the outer surfaces of the metal plate belong, and the welded plateau portion was placed on the outside of each metal plate on both sides of the bending portion. It may be a sheet metal processed product that is cut out so as to be in the same plane as the plane to which the surface belongs, and is formed at a dense perpendicular top.

The sheet metal processed products having these basic configurations include several sheet metal processed products as shown below.
One of them is a plurality of notches having a depth corresponding to 1/3 of the thickness of the metal plate along a plurality of desired folding lines parallel to the outer surface of the metal plate at a predetermined interval. Form grooves, and bend the notched grooves into a polygonal shape by bending them so that the inner surface of the notched grooves is a corner of a predetermined angle or a valley fold near the corner. It is made into a groove shape, and each notched groove is built up by welding so as to include a predetermined vertical vertices composed of planes to which the outer surfaces of each metal plate on both sides of each bending portion belong. Sheet metal products that are formed by cutting out these weld overlay parts so as to be flush with the plane to which the outer surface of each metal plate belongs on both sides of each bending position, and forming a solid top portion of a predetermined angle. It is.

    In addition, two notch grooves having a depth corresponding to 1/3 of the thickness of the metal plate are formed on the outer surface of the metal plate along two desired folding lines parallel to each other at a predetermined interval. Then, the notch groove portion is bent in a mountain fold so that the portion where the inner surface of the notch groove coincides with the corner is a right angle corner or a valley fold near the corner. Each notch groove is built up by welding so that it has a similar cross-sectional shape and includes a 90 ° virtual apex angle formed by planes to which the outer surfaces of the metal plates on both sides of each bending portion belong. In addition, each welded portion is cut out so as to be in the same plane as the plane to which each metal plate outer surface on both sides of each bending portion belongs to form a solid right-angled top portion to form a groove-shaped member, The edge of the web is the contact edge where the outer surface is notched. A pair of the groove portions are formed in a web arrangement in which the respective groove portions are opposed to each other and the sum of the opposite web width dimensions is controlled to be equal to each other, and the respective contact edge portions are in contact with each other by welding. In addition, it is a sheet metal processed product that has a structure in which the welded portion is cut out so as to be flush with the plane to which the respective outer surfaces of the webs belong.

    As described above, according to the sheet metal processing method of the present invention and the sheet metal processed product thereby, a notch groove having a predetermined depth is formed along the desired bending line on the outer surface of the metal plate, and bending is performed. The notch groove is a fold-folded part of the notch groove, and the inner surface of the notch groove is a corner fold at a predetermined angle or a valley fold near the corner. After being bent so as to be welded so as to include a built-up including a virtual vertical angle of a predetermined angle constituted by planes to which the respective metal plate outer surfaces on both sides of the bending portion belong, Each metal plate on both sides of the bending portion is cut so that it is flush with the plane to which the outer surface of the metal plate belongs to form a dense top at a predetermined angle, and the inner surface corresponding to the bending line is a predetermined portion of the wrinkle. Accurate with no weld at the corner of the angle or at the valley fold near the corner There is no need to adjust the bonding angle using a diaphragm or backing metal, or to reinforce the inner bonding part. As a result, it is possible to obtain the excellent features that the number of parts is minimized, the number of manufacturing steps is reduced, the production can be performed at a low cost, and the high-precision cornering can be realized both inside and outside.

    In addition, a notch groove set to a depth corresponding to 1/3 of the thickness of the metal plate along the bending line on the outer surface of the metal plate is formed, and the thickness of the metal plate 2/3 is left as it is and is subjected to bending, so that 2/3 of the bending portion made of the same material can be secured and welded to build up the notch groove after bending. Furthermore, the strength can be increased, the accuracy and appearance of the cornering process can be improved, and excellent strength can be given. Further, the bending angle of the metal plate can be set at the 90 ° corner or the corner. As well as frame frames and display cabinet frames that need to be aesthetically formed in close corners and frames for furniture, home appliances, etc. Combining members with the same shape as the hollow part In addition to being suitable as a hollow member that does not interfere with the welded part or diaphragm in the hollow part, it is suitable for pipes and waterways that require airtightness, water tightness and sealing strength. It also has the advantage that the range of use can be greatly expanded, for example, it can be used for frame parts.

    Then, a notch groove set to a depth corresponding to 1/3 of the thickness of the metal plate is formed along a plurality of parallel bending lines on the outer surface of the metal plate at a predetermined interval. By doing this, U-shaped, U-shaped, polygonal tube-shaped, etc., sheet metal products with more complicated shapes than L-shaped, V-shaped, and rectangular shapes with a single notched groove It can be manufactured, and the bending angle of the metal plate can be set to a corner of 90 ° or a corner close to the corner, which improves the work efficiency of the cutting of the corner and improves the work efficiency. Compared to the above, an effect of obtaining a sheet metal processed product having excellent productivity and a beautiful appearance can be obtained.

    In addition, a pair of U-shaped or U-shaped sheet metal parts manufactured in the same manner as above are combined in a rectangular cross-section by abutting the edges whose outer surfaces are cut off and exposed to the outer folds. Each edge recess formed in the shape of the same metal or a metal excellent in weldability is welded to form a weld overlay for connection, and each edge recess is sandwiched In order to make the web outer surfaces arranged so as to be flush with each other continue to be in the same common plane, each weld overlay that bulges outward from the common plane is cut off to be flush with each other. It is possible to produce square pipes with excellent appearance and high accuracy squared out at low cost efficiently, and much lighter and significantly larger than conventional products of the same size and shape. It is possible to increase the durability strength so far. It has become one that can get hardly expected that could not be such soo features to.

    In addition, the notch groove is formed so that its deepest portion has a continuous R cross-sectional shape, thereby preventing stress concentration in the bending process of sheet metal, preventing the occurrence of cracks and concentration of residual stress, An effect of further improving the durability can be added.

In implementing the present invention having the configuration as described above, the best or desirable mode will be described.
The process of forming a notch groove on the outer surface of the metal plate along the folding line is to ensure that the wall surface that will be the outer surface after folding is made for the purpose of enabling or facilitating the subsequent welding operation after being foldable. It must be formed in a crocodile, and the stress accompanying the bending process is concentrated only in the vicinity of the notch groove forming part, and after the bending process, the outer surface of the metal plate other than the notch groove part is curved. However, it should be set to a depth that can be maintained flat, and in addition, the strength of the bent portion of the metal plate is affected by the depth setting. Considering the required strength, it is desirable to set the outer surface of the metal plate other than the notch groove after bending to a depth that can be maintained flat, but decorative items that do not require that much strength To In this case, for example, the depth of the notch groove corresponding to 9/10 of the metal plate thickness can be set, and the depth can be set to such a degree that the angle posture after bending can be maintained, In the case of a metal plate that is easily plastically deformed, it is possible to set the depth of the notch groove corresponding to 1/10 of the metal plate thickness. It is possible to restrict the boundary line so as to assist and so as to determine and enable the bent portion to be a linear ridge line type.

    However, in the case of a commonly used metal plate such as steel, stainless steel, aluminum alloy, titanium alloy, magnesium alloy, copper, brass, bronze, etc., the notch groove depth corresponding to 1/3 of the wall thickness If the depth of the notch groove is set to be less than 1/3 of the thickness of the metal plate, the planar shape of the outer surface portion desired for the notch groove by bending is set. Will not be maintained and will be curved, increasing the amount of cutting in the subsequent cutting process, increasing the number of man-hours, and increasing the depth of the notch groove. If it is set so as to correspond to a value exceeding 1/3 of the above, the strength of the bent portion of the metal plate is reduced to a strength of about 1/3 or less when the same thickness metal plate is bent. Unsuitable for use as a strength component It occurs the disadvantage that becomes things.

    After forming a notch groove on the outer surface of the metal plate along the bending line as described above, the notch groove on the outer surface of the metal plate is folded in a mountain, and the inner surface of the notch groove is It is necessary to bend the notch groove in order to form a built-up part by welding that will be performed later, so that the part that coincides with the valley is folded at a predetermined angle. On the contrary, if the cut groove on the outer surface of the metal plate is valley-folded, it becomes extremely difficult to fix the build-up portion by subsequent welding, and there is almost no chamfering by cutting that requires subsequent accuracy. It will be possible.

    In the process of forming the weld build-up part by welding to the notch groove part after bending, depending on the type of the target metal plate, such that the notch groove is built up so as to include the apex angle of a predetermined angle. Either the same metal or a metal with excellent weldability must be welded. More specifically, gas welding, coated arc welding, tungsten inert gas arc welding, metal inert gas welding, argon Various existing welding, such as welding, carbon dioxide arc welding, spot welding, plasma welding, thermite welding, electroslag welding, submerged arc welding, electron beam welding, laser welding, or arc brazing, resistance brazing, furnace It can be said that it can be carried out by various existing brazing represented by inner brazing, torch brazing, etc. Depending on the type, it is desirable to select and use commercially available materials such as steel welding rods, stainless steel welding rods, gas welding rods, low-temperature welding rods or wires, and those coated with various fluxes. It is also possible to use the produced welding material. In addition, the weld build-up part must be formed as a virtual angle between the two outer surfaces adjacent to each other across the notch groove after being bent at a predetermined angle. In the case of the weld overlay portion smaller than the apex angle, there arises a disadvantage that an accurate apex angle cannot be formed even by a subsequent cutting process.

    In other words, the weld build-up portion is made to be a crossing surface wall parallel to each of the outer surfaces crossing each other, in other words, a solid with a predetermined angle formed by planes to which the respective outer surfaces of the metal plates on both sides of the bent portion belong. Cut to the top and finish as it is as a solid top with a predetermined angle, if necessary, that is, when it is necessary to chamfer the corners, decoration, anti-slip, safety The shape developed from simple corners such as chamfering or uneven surface by post-processing on the top part that is densely formed at a predetermined angle when it is necessary to make the uneven surface or the like for the purpose of ensuring the property Either to form the structure, or to form a processed surface of the shape and structure developed from these corners in parallel while following the formation process of the dense top Processing by Facilities, it is needless to say that are likely.

In the process of forming this solid top part, it must be performed using a machine tool corresponding to the accuracy of cornering required at the time of completion of the sheet metal workpiece, more specifically, a milling machine, a shaper, In addition to machining centers, grinding machines, numerically controlled machine tools, various machine tools such as electron beam machines, electric discharge machines, and water jet cutting machines can be used, depending on the purpose of manufacturing sheet metal products. Select and use a processing machine that can achieve high processing accuracy and man-hours.
In addition, when multiple notch grooves are formed, all the notch grooves can be processed at the same time, and the subsequent bending, welding, and cutting processes can be performed at the same time, reducing man-hours and improving work efficiency. However, it is not always necessary to carry out the simultaneous machining as long as the machining of each notch groove and the subsequent bending, welding, and cutting are performed sequentially. That is, after forming some notch grooves in a plurality of pieces, after performing bending and subsequent processing, forming the remaining notched grooves, and then bending the remaining bending processing, and thereafter Needless to say, it is also possible to proceed with the work.

    For the metal plate, the processed sheet metal product to be manufactured must be made into a plate-like material that can be manufactured by the sheet metal processing method of the present invention, and more specifically, ISO (International Organization for Standardization) and Nihon Kogyo. It can be said that it is a ready-made metal plate produced according to the industrial standard of each country such as the standard, American industrial standard, German industrial standard, for example, steel plate, stainless steel plate, aluminum alloy plate, titanium alloy plate, magnesium alloy plate, copper plate, It can be made of brass plate, bronze plate, etc., made of synthetic resin plate or glass plate that can be bent or welded by cold or hot, welding, brazing, cutting, polishing, or various composite materials It is also possible to replace the plate material.

    The bending line is assumed to be linear along the desired bending point of the metal plate and does not actually exist, but may appear as a ruled line before processing, but it is a sheet metal processed product Is not essential. However, it must be assumed where the notch groove is to be formed, and the notch groove must be accurately formed so as to coincide with this.

    The notch groove is capable of concentrating the stress generated during bending along the bending line that becomes the bending part of the metal plate, and enabling or facilitating build-up by welding after bending. The depth dimension can theoretically be equivalent to 1/10 of the thickness of the metal plate, or it can be set to a value corresponding to 9/10 of the thickness of the metal plate. Yes, it is sufficient to have a depth that can maintain the integrated state of the metal plate and the bent shape even after bending, but the strength obtained after bending various commonly used metal plate materials and welding In consideration of the machinability of the built-up portion, it should be set to a depth corresponding to 1/3 of the metal plate thickness, and the depth exceeds 1/3 of the metal plate thickness. Is not enough strength, When the depth is set to less than 1/3 of the metal plate thickness, there is a disadvantage that the bending work and the machinability of the weld overlay portion are deteriorated as described above. The notch groove is formed so that the deepest portion thereof is formed from a continuous R cross-sectional shape, and the deepest portion of the R cross-sectional shape (the stress concentration portion where the plate thickness is the thinnest) coincides with a desired bending line. It should be related, and it is desirable to prevent excessive stress concentration in the bending process of the metal plate, and to prevent generation of cracks and concentration of residual stress.

The weld overlay part is formed by expanding the notch groove part that has been expanded by bending the metal plate to reinforce the bent corner part, and each of the outer surfaces that intersect with each other across the notch groove. In other words, the metal plate has a function of being able to form a solid apex angle by cutting each metal plate so that the outer surface of each metal plate is flush with the plane to which the metal plate belongs. It must be integrated with the notch groove of the metal plate and the outer surface edge portion facing it with sufficient strength, and the apex angle to be cut and formed later must be included in the wall thickness. In addition, it must be manufactured with care not to generate cracks or bead contours that are dented from the same plane as the plane to which the outer surface of each metal plate on both sides of the bending site belongs. High When improving machining accuracy and appearance, the welding method should be used to prevent the formation of linear patterns and grooves at the boundary between the welded part and the continuous outer surface edge part by square cutting. It is desirable to study the materials and materials in more detail and finish them closely.
In the following, the structure of the present invention will be described in detail together with an embodiment representative of the present invention shown in the drawings.

    FIG. 1 is a plan view of a metal plate formed with a notch groove, FIG. 2 is a side view of the metal plate formed with a notch groove, FIG. 3 is a side view of a sheet metal product subjected to bending and welding, and FIG. The example shown in the perspective view of the sheet metal processed product with the four corners processed is that the metal along the two folding lines IL and IL of the outer surface 12 of the metal plate 11 parallel to each other with a predetermined interval B1. The notch groove | channels 4 and 4 set to the board 11 and the depth D equivalent to 1/3 of the thickness dimension T are formed, each notch groove | channel 4 and 4 are mountain-folded, and each notch groove | channel 4 and 4 It is made of the same metal so that each notch groove 4, 4 is built up to include a 90 ° apex angle after being bent at 90 ° so that the inner surface 15 of the inner surface 15 is a valley fold. Alternatively, an outer surface that is welded to any one of metals excellent in weldability and crosses the weld overlay portions W3 and W3 next to each other. In other words, it is cut so that the outer surface of each metal plate on both sides of the bending portion is flush with the plane to which the metal plate belongs, and a solid apex angle is formed. 1 shows a typical embodiment of the processed sheet metal product 1 according to the invention.

As shown in FIGS. 1 to 4, the sheet metal processed product 1 is a square channel 1 manufactured by the sheet metal processing method of the present invention. The following is a sheet metal processed product according to the work procedure of the sheet metal processing method. The structure of 1 will be described.
As shown in FIG. 1, the metal plate 11 used for manufacturing the square channel 1 is a stainless steel plate having a predetermined thickness T according to Japanese Industrial Standard, and is cut into a rectangle having a predetermined width B and a predetermined length L. In the longitudinal direction, the outer surface 12 that is turned upside down by folding is divided into a central wall 13 set to a desired width B1 and vertical walls 14 and 14 having a width B2 sandwiching the central wall 13 therebetween. The two folding lines IL, IL which are parallel to each other are drawn and processed by using a milling machine or a machining center as shown in FIGS. 1 and 2, so that these two bending lines IL, The notched grooves 4 and 4 having a depth D corresponding to 1/3 of the thickness T of the metal plate 11 are cut. Therefore, the thickness R remaining between the deepest bottom wall of each notch groove 4, 4 and the inner surface 15 that faces inward by folding is 2/3 of the thickness T of the metal plate 11. It is equivalent to.

    The notch grooves 4 and 4 preferably have their groove widths BG kept to 1/3 or less of the thickness T of the metal plate 11, and the minimum groove width dimension BG depends on the width dimension of the cutting tool used. It is assumed that each deepest part wall has a continuous R cross-sectional shape and is cut so that the central deepest point coincides with the bending line IL.

In the subsequent folding process, as shown by the solid line arrows in FIG. 2, the outer surface 12 folds the ridges at the notch grooves 4 and 4 using a bending machine or a bending robot, and each notch Folding is performed at an angle of 90 ° so that the inner surface 15 of the groove coincides with the trough, and is bent at the angle of 90 °. Welding machine capable of welding stainless steel plates such as tungsten inert gas arc welding, metal inert gas welding using inert shielding gas and welding wire in combination with notched grooves 4 and 4 that are open in a direction. By using a welding robot or the like, as shown in FIG. 3, weld build-up portions W3 and W3 are formed.
These weld build-up portions W3 and W3 include within the wall thickness each virtual apex angle formed by the central wall 13 on the outer surface 12 and the vertical walls 14 and 14 intersecting with each other at right angles. It shall be formed so that it may become a size and a shape.

    The weld build-up portions W3 and W3 formed in this way are slightly parallel to the central wall 13 of the outer surface 12 by a cutting process performed using a milling machine or a machining center, for example, slightly (for example, 0.2 to 0.2). After cutting once or a plurality of times so as to cut, each vertical wall 14 has an angle θ of 90 ° as shown in FIG. 4 with reference to the central wall 13 of the cutting surface. , 14 is cut once or a plurality of times so as to cut the entire surface of the outer surface 12 slightly (for example, about 0.2 to 0.5 mm), thereby completing the square channel 1 having high accuracy.

    5 is a perspective view of a pair of square channels combined in the rectangular cross section of FIG. 5, a perspective view of a pair of square channels welded and integrated into the rectangular cross section of FIG. 6, and an angle of the completed rectangular cross section of FIG. The example shown in the perspective view of the pipe is that the metal plate has an outer surface 12 that is parallel to each other with two folding lines IL and IL that are parallel to each other at a predetermined interval. Notch grooves 4 and 4 set to a corresponding depth D are formed, each notch groove 4 and 4 is folded in a mountain, and a portion where the inner surface 15 of each notch groove 4 and 4 coincides with a trough is formed. After bending to 90 ° so as to be folded, either the same metal or a metal excellent in weldability so that each notch groove 4, 4 is built up to include a 90 ° apex angle. The weld overlays W3 and W3 are connected to each other on the outer surface parallel to each other. A U-shaped cross section or U-shaped cross section formed by forming a solid apex so as to form a fork surface wall, that is, cut to be flush with the plane to which the outer surface of each metal plate on both sides of the bending portion belongs. A pair of sheet metal parts is prepared.

    The edges of the pair of sheet metal parts 1, 1, with the outer surfaces 12, 12 cut away from each other, are combined into a rectangular cross-sectional shape and exposed to the edge recesses 51, 51 exposed on the outside. Then, welding of either the same metal or a metal excellent in weldability is performed to form the weld overlay portions W4 and W4 for connection, and the end recesses 51 and 51 are sandwiched to be flush with each other. The outer surfaces arranged adjacent to each other are cut off from the protruding portions of the welded welded portions W4 and W4 for connection to form the same surface wall shape so that the outer surfaces are continuously arranged in the same surface shape. The other typical example in the sheet-metal processing product 1 by the sheet-metal processing method of this invention is shown, and the following is a corner of the cross-sectional shape of the sheet-metal processing product 1 according to the manufacturing process of the sheet-metal processing method of the present invention. The structure of the pipe 5 will be described.

    A pair of sheet metal parts 1 and 1 having a U-shaped cross-section or a U-shaped cross-section for use in manufacturing the square pipe 5 having the above-mentioned cross-section is obtained by the manufacturing process shown in FIGS. The cut-out channels 1 and 1 should be formed by using a milling machine, a machining center, or the like, along the outer corners of the leading edges of the vertical walls 14, 14,. After performing chamfering with an inclination angle of 45 ° corresponding to the thickness dimension, both the central walls 13 and 13 are exactly parallel to each other, as shown in FIG. The vertical walls 14, 14,... Are abutted so that they are exactly flush with each other, and appropriate jigs are used, or manual work or a welding machine or welding robot is used. Spot welding After carrying out the preparatory work on whether or not to perform temporary fixing, the respective edge recesses 51 exposed on the outside so as to form a V-shaped cross section between the vertical walls 14, 14,... , 51 are filled by welding with a welding machine or a welding robot, and as shown in FIG. 6, weld build-up portions W4, W4 are formed so as to protrude outward from the vertical walls 14, 14,.

    These weld build-up portions W4 and W4 can cut the outer surfaces 12, 12 of the vertical walls 14, 14,... At an angle of 90 ° with the central wall 13 of any one of the square channels 1 as a positioning reference. As shown in FIG. 7, the raised portion is cut into a smooth surface by a milling machine or a machining center installed so that the vertical walls 14 are arranged so as to be flush with both outer surfaces 12 and 12. , 14 are cut one or more times so that they are slightly cut (for example, about 0.2 to 0.5 mm) so as to be continuous with each other, and a square pipe 5 having a high-precision cross section is completed. .

(Operation of Example)
The square channel 1 which is a processed sheet metal product of Example 1 having the above-described configuration is basically composed of a single metal plate 11, and is shown in FIG. 1 from a ready-made stainless steel plate having a predetermined thickness T. As described above, it is cut out into dimensions of a predetermined width B and a predetermined length L, and can be said to be mass-produced as compared with the case of manufacturing by combining a plurality of metal plates. By cutting the notched grooves 4 and 4 into the outer surface 12, accurate bending can be realized, and the deepest part wall of each notched groove 4 and 4 has a continuous R cross section as shown in FIG. The stress generated when cutting into a shape and bending each notch groove 4 or 4 into a mountain fold is uniformly dispersed, and the occurrence of cracks, cracks, concentrated points of residual stress, etc. can be reliably prevented. It becomes possible. Then, the deepest points of the notched grooves 4 and 4 are made to coincide with the folding lines IL and IL, respectively, so that the stress generated during the folding process is accurately concentrated along the folding lines IL and IL. Therefore, the accuracy of the bending process is remarkably improved.

    Further, it is assumed that the depth D of each notch groove 4, 4 is set to 1/3 of the thickness of the metal plate 11, and a stainless steel plate having a thickness T of 2/3 of the thickness T is formed at the bent portion. It is possible to ensure almost the same strength as that of the bent one, and considering the reinforcement by later welding, it is also possible to secure a higher strength than that, and the conventional multiple metal plates In the case of bonding by welding, twisting and bending occurred after welding, but this can be reliably prevented.

    In addition, tungsten oxide gas arc welding, metal inert gas welding, and other welding that does not form an anti-oxidation film is performed, eliminating the need for complicated removal of the anti-oxidation film, and eliminating bead marks after cutting the welded part. The appearance of the weld overlays W3 and W3 shown in FIG. 3 can be observed and confirmed immediately after the welding is completed, and quality control can be easily performed. Is possible.

    Further, as shown in FIG. 4, unnecessary portions of the weld overlay portions W3 and W3 are cut in accordance with the angle θ of 90 °, and compared with the square channel of the structure shown in FIG. Thus, the increase in weight due to welding can be minimized, and the number of work steps can be greatly reduced by reducing the number of welding.

    Further, what is shown as Example 2 is a pair of two of the cornering channels 1 of Example 1 shown in FIG. 4, and the front edge of each vertical wall 14, 14,... As shown in FIG. 5, the welded wall portions W4 and W4 as shown in FIG. 6 are formed in the edge recesses 51 and 51 exposed between the two vertical walls 14 and 14... As shown in FIG. 14, the two square channels 1 and 1 are integrated so as to firmly maintain the cross section of the character-shaped section, and compared with the conventional type shown in FIG. Installation of 35, ... becomes unnecessary.

(Effect of Example)
In addition to the features described in the section of the effect of the present invention, the squaring channel 1 of Example 1 having the above-described configuration is basically made of a ready-made stainless steel plate as shown in FIGS. Manufactured from a single cut metal plate 11, it is possible to use materials that are abundantly supplied to the market and available at a low price, and the number of parts is greatly reduced and suppressed compared to conventional products. It is possible to reliably prevent the occurrence of twisting and distortion after completion, which has been unavoidable for conventional products, by performing bending and welding while securing the integration of the metal plate 11, The repair work has been greatly reduced (the repair man-hours and repair costs have been confirmed to be 30% lower than before) to improve productivity and reduce production costs, and include weld overlays W3 and W3. Central wall 13 4 and the entire outer surface 12 of the vertical walls 14 and 14 by performing a slight cutting process (for example, with a cut of about 0.2 to 0.5 mm), the welded wall shown in FIG. It is possible to finish the traces of the raised portions W3 and W3 to such an extent that they can hardly be distinguished from each other, and a great effect is obtained that an excellent appearance can be obtained.

    The processed sheet metal product taken up as the second embodiment is formed by integrating the pair of the cornering channels 1 shown in FIGS. 1 to 4 by butt welding as shown in FIGS. 5 to 7. It is possible to reduce the number of parts and the associated manufacturing man-hours, reduce the weight of the product, and enable the pair of squared channels 1 and 1 accurately finished. Thus, there is obtained an advantage that the rectangular pipe 5 having a rectangular cross section with excellent accuracy can be obtained by relatively simple work.

(Conclusion)
As described above, the sheet metal processing method of the present invention and the processed sheet metal product according to the present invention enable the intended purpose to be achieved evenly by the novel configuration, and are easy to manufacture, and are a plurality of conventional sheets. Compared to products welded by combining two plate materials, it can be made much lighter and cheaper, making it much more economical, and the occurrence of bending and distortion is greatly reduced, and manufacturing workability is greatly improved. Because it can be improved, not only in the metal processing industry that suffers from rising labor costs, but also in the various industrial materials industries that handle precision parts such as square channels and square pipes, high strength parts, etc. It has been widely used and widely used by general companies and households who want to install metal frames and frames with low-cost and beautiful appearance, such as furniture and home appliances with excellent design. It is expected to be the thing.

The drawings show some typical embodiments that embody the technical idea of the sheet metal processing method of the present invention and the processed sheet metal products.
It is a top view which shows a part of metal plate. It is a side view which shows a metal plate. It is a side view which shows the processed component which gave bending and welding. It is a perspective view which shows the principal part of a squaring channel. FIG. 5 is a perspective view showing a pair of square channels combined in a square shape. It is a perspective view which shows the square pipe of the cross-sectional shape after welding. It is a perspective view which shows the principal part of the square pipe of a cross-section. It is a side view which shows the conventional channel by sheet metal processing. It is a perspective view which shows the components structure of the conventional squaring channel. It is a side view which shows the conventional squaring channel welded. It is a side view which shows the conventional squaring channel. It is a perspective view which shows the components structure of the square pipe of the conventional cross-sectional shape. It is a side view which shows the square pipe of the conventional cross-sectional shape welded. It is a side view which shows the square pipe of the conventional cross-sectional shape.

Explanation of symbols

1 Square out channel (sheet metal processed products, processed parts)
11 Metal plate
12 Same outer surface
13 Central wall
14 Same vertical wall
15 Inside surface 2 Corner 3 Base plate
31 Same wall board
32 Chamfered part
33 Cover plate
34 Same diaphragm
35 Same backing metal 4 Notch groove 5 Square pipe with square cross section (processed sheet metal)
51 Concave edge W1 Welded part W2 Welded part W3 Welded overfilled part W4 Welded overfilled part Z Unwelded part IL Bending line T Metal plate thickness B Metal plate width L Metal plate length B1 Central wall Width B2 Vertical wall width D Notch groove depth BG Notch groove width R Notch groove wall thickness

Claims (13)

    A notch groove having a predetermined depth is formed on the outer surface of the metal plate along a desired bending line, and the notch groove portion is mountain-folded so that the inner surface of the notch groove coincides with the wrinkle. After bending so as to be a corner fold of a predetermined angle or a valley fold close to the corner, include a virtual apex angle of a predetermined angle constituted by planes to which the respective metal plate outer surfaces on both sides of the bending portion belong, The notch groove is subjected to build-up processing by welding of either the same metal or a metal excellent in weldability, and the weld build-up portion is placed outside each metal plate on both sides of the bending portion. A sheet metal working method characterized in that a solid top portion having a predetermined angle is formed by cutting each surface so as to be in the same plane as the plane to which the surface belongs.     On the outer surface of the metal plate, a notch groove having a depth corresponding to 1/3 of the thickness of the metal plate is formed along a desired bending line, and the notch groove portion is cut in the same manner as a mountain fold. The inner surface of the notch groove is bent so that the part where the grooves coincide with each other is a right-angled corner or a valley fold close to the corner. The notch groove was subjected to build-up processing by welding either the same metal or a metal excellent in weldability so as to include a 90 ° virtual apex angle formed by planes to which the surfaces belong. The sheet metal according to claim 1, wherein the weld build-up portion is cut out so as to be flush with a plane to which the outer surface of each metal plate on both sides of the bent portion belongs to form a dense right-angled top portion. Processing method.     On the outer surface of the metal plate, a plurality of notch grooves having a depth corresponding to 1/3 of the metal plate thickness dimension are formed along a plurality of desired bending lines parallel to each other at a predetermined interval. Polygonal groove shape by bending these notch grooves in a mountain fold so that the inner surface of the notch groove is a corner with a predetermined angle or a valley fold near the corner. After that, each notch groove is made of the same metal or weldable so as to include a predetermined vertical virtual angle formed by the planes to which the outer surfaces of the respective metal plates on both sides of each bending portion belong. After performing build-up processing by welding of one of the excellent metals, the welded-up portions are cut out so that they are flush with the plane to which the outer surface of each metal plate on both sides of each bending portion belongs. Sheet metal characterized by forming a solid top at a predetermined angle Engineering method.     On the outer surface of the metal plate, two notched grooves having a depth corresponding to 1/3 of the metal plate thickness are formed along two desired folding lines parallel to each other at a predetermined interval. These notched groove parts are bent in a mountain fold, and the inner surface of the notched groove is bent so that the part where the wrinkles coincide with each other is a right-angled corner or a valley fold close to the corner. After having a similar cross-sectional shape, each notch groove is made of the same metal, so as to include a virtual apex angle of 90 ° formed by planes to which the outer surfaces of the respective metal plates on both sides of each bending portion belong. After performing build-up processing by welding of one of the metals excellent in weldability, these weld build-up portions are the same plane as the plane to which the outer surface of each metal plate on both sides of each bending portion belongs. Each of which was cut to form a solid right-angled apex. Sheet metal processing how.     On the outer surface of the metal plate, two notched grooves having a depth corresponding to 1/3 of the metal plate thickness are formed along two desired folding lines parallel to each other at a predetermined interval. These notched groove parts are bent in a mountain fold, and the inner surface of the notched groove is bent so that the part where the wrinkles coincide with each other is a right-angled corner or a valley fold close to the corner. After having a similar cross-sectional shape, each notch groove is made of the same metal, so as to include a virtual apex angle of 90 ° formed by planes to which the outer surfaces of the respective metal plates on both sides of each bending portion belong. After performing build-up processing by welding of one of the metals excellent in weldability, these weld build-up portions are the same plane as the plane to which the outer surface of each metal plate on both sides of each bending portion belongs. Each is cut out to form a solid right-angled top to form a groove-shaped member. After the pair is processed into an abutting edge where the outer surface is notched at the edge of each web, each groove is opposed and the sum of the web width dimensions facing each other. The abutting edge portions are brought into a butted state by arranging the webs so that they are equal to each other, and the grooves formed between the abutting edge portions are made of the same metal or have excellent weldability. After performing the build-up processing by welding of any of the metal made, the welded-up portions are cut out so that the outer surfaces of the respective webs are flush with the plane to which both belong. A sheet metal processing method characterized by being formed into a thing.     The notch groove is formed with a continuous R cross-sectional shape at the deepest portion thereof to prevent stress concentration in bending and to prevent concentration of cracks and residual stress. The sheet metal processing method according to claim 1.     7. A solid top portion of a predetermined angle is finished as it is as a corner portion of a predetermined angle, or a chamfering process, a concavo-convex process or the like is applied to the top part to form a processed surface. The sheet metal processing method according to one item.     A notch groove having a predetermined depth is formed on the outer surface of the metal plate along a desired bending line, and the notch groove portion is mountain-folded so that the inner surface of the notch groove coincides with the wrinkle. After bending so as to form a corner fold at a predetermined angle or a valley fold close to the corner, the cutting is performed so as to include a virtual apex angle of a predetermined angle formed by planes to which the outer surfaces of the respective metal plates on both sides of the bent portion belong. The notch groove is built up by welding, and the welded build up part is cut out so that it is flush with the plane to which the outer surface of each metal plate on both sides of the bent portion belongs, forming a solid top with a predetermined angle. A sheet metal processed product obtained by the sheet metal processing method according to claim 1.     On the outer surface of the metal plate, a notch groove having a depth corresponding to 1/3 of the thickness of the metal plate is formed along a desired bending line, and the notch groove portion is cut in the same manner as a mountain fold. The inner surface of the notched groove is bent so that the portion where the grooves coincide with each other is a right-angled corner or a valley fold close to the corner, forming an L-shape, and the outer surfaces of the metal plates on both sides of the bent portion belong. The notch groove was built up by welding so as to include a virtual apex angle of 90 ° constituted by planes, and the weld build-up portion was the same as the plane to which the outer surface of each metal plate on both sides of the bent portion belongs. The sheet metal processed product by the sheet metal processing method according to claim 2, wherein each of the surfaces is cut to form a solid right-angled top.     On the outer surface of the metal plate, a plurality of notch grooves having a depth corresponding to 1/3 of the metal plate thickness dimension are formed along a plurality of desired bending lines parallel to each other at a predetermined interval. Polygonal groove shape with these notched grooves bent in a mountain fold, with the inner surface of the notched groove being bent at a corner of a predetermined angle or a valley fold near the corner. None, each notched groove was built up by welding so as to include a predetermined vertical vertices composed of planes to which the outer surfaces of the respective metal plates on both sides of each bending portion belong, and these welded parts are welded Are either cut to form the same top as the plane to which the outer surface of each metal plate on both sides of each bending portion belongs, and are formed on a solid top at a predetermined angle. A sheet metal processed product by the sheet metal processing method according to one item.     On the outer surface of the metal plate, two notched grooves having a depth corresponding to 1/3 of the metal plate thickness are formed along two desired folding lines parallel to each other at a predetermined interval. These notch grooves are bent in a mountain fold and the inner surface of the notch groove is bent at a right angle corner or a valley fold close to the corner so that the cross section is U or similar. In addition to the cross-sectional shape, each notched groove was welded by welding so as to include a virtual apex angle of 90 ° composed of planes to which the outer surfaces of each metal plate on both sides of each bending portion belong. The weld overlay is cut out to be the same plane as the plane to which the outer surface of each metal plate belongs on both sides of each bending position to form a solid right-angled top to form a groove-shaped member. Each edge is an abutting edge with the outer surface notched. The webs are arranged in such a manner that the respective groove portions are opposed to each other and the sum of the opposite web width dimensions is made equal to each other so that the contact edge portions are brought into contact with each other and welded together. The sheet metal working method according to claim 5, wherein the weld overlay portions are cut into a rectangular cross-section so as to be flush with a plane to which the respective outer surfaces of the webs belong. Sheet metal processed products.     The sheet metal processed product according to any one of claims 8 to 11, wherein the notch groove has a continuous R cross-sectional shape at a deepest portion thereof.     The solid top portion of the predetermined angle is either finished as it is at the corner portion of the predetermined angle, or the processing surface is formed on the top portion. A sheet metal working method according to any one of claims 8 to 12.

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