JPH0255627A - Blank layout method for elbow forming use steel plate stock and elbow formed by the same steel plate stock - Google Patents

Abstract

PURPOSE:To effectively utilize even a steel plate of narrow width for an elbow forming stock by placing a center division part steel plate stock and both right and left division steel plate stocks being in an opposed state so as to be made adjacent to each other alternately, setting the breadth of both of them so as to become equal and executing the blanking. CONSTITUTION:A part which cuts and eliminates both edge parts of an elbow forming use steel plate stock becomes a center division part steel plate stock 2. Both left and right edge parts which are cut become division steel plate stocks 3, 4. The sum of width of the center division part steel plate stock 2 and width of the left and right division steel plate stocks 3, 4 are set to the same dimension. Width of a standard length steel plate 1 is allowed to conform with width of the steel plate stock 2. Subsequently, the center division part steel plate stock 2 and both the left and right split steel plate stocks 3, 4 being in an opposed state are made adjacent to each other alternately and placed, the breadth of both of them is set equally and the blanking is executed. In such a way, even a steel plate of narrow width can be utilized effectively for an elbow forming stock.

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention provides a method for forming an elbow using a steel plate as a raw material.
It is characterized by making it extremely rational by making it into a steel plate with a fixed width that is narrower than normal ones, thereby achieving a reduction in the amount of materials used and a significant reduction in manufacturing costs. The present invention relates to a method for cutting a steel sheet material for elbow forming, and an elbow formed using this steel sheet material.

(Prior Art) As means for elbow forming, there are a method of forming using a steel pipe as a raw material and a method of forming using a steel plate as a raw material.

When a steel pipe is used as the material, the elbow is formed by means such as hot forming, cold forming, or high frequency forming.

If steel plate is used as the material, from a steel plate of standard width,
A steel plate material for elbow forming is cut out, and then compression molded using a predetermined mold to complete the elbow.

(Problems to be Solved by the Invention) When producing one report using a steel pipe as a raw material as described above, there is no waste of materials used.

However, when forming an elbow using a steel plate, the fifth
As shown in the figure, in order to continuously punch out the steel plate material B for elbow forming, which has the same shape as the unfolded shape of the required elbow, from the fixed-length steel plate A, each of the punched materials as shown in the figure A triangular residual material C was inevitably formed in between, resulting in extremely poor yield.

In addition, conventionally, the width of the sized steel plate A used is
As a result of the requirement to use a material having at least the width of the steel sheet material B for elbow forming, it has become impossible to use, for example, a steel sheet with a width even slightly narrower than this.

On the other hand, in recent years, expensive stainless steel sheets have been widely used as material for forming elbows, and the poor yield of these materials has led directly to a rise in product prices. .

The object of the present invention is to use the conventional steel plate as described above as a material.

(Means for Solving the Problems) In order to achieve the above-mentioned object, the method for cutting a steel sheet material for elbow forming according to the present invention is to form a bending abdomen on both left and right sides from a conventional steel sheet material B for elbow forming. A center-divided steel plate material 2 for elbow forming having a shape obtained by cutting and removing the portion near c and c in the longitudinal direction, and a bending abdomen forming edge of each other and having a shape corresponding to the cut and removed portion. Part c
, the left-side split steel plate material 3 for elbow forming and the right-side split steel plate material 4 for elbow forming, which are arranged with their c portions facing each other, are cut into a steel plate 1 of a standard width, and the relevant edge is cut into the steel plate. 1, and are arranged alternately and in multiple stages in the longitudinal direction, and the edges to be cut are formed as joining edges 2a, 2b, 3a, and 4a, respectively, and further, The mutual adjacency form of each stage is determined by the bent abdomen forming edge c of the opposing left and right divided steel plate materials 3 and 4, the upper end opening surface portion forming edge a, a near the c portion, or the lower end opening. The edges a and b for forming the surface portion form the upper end opening surface portion forming edge a or the lower end opening surface portion of the center dividing portion steel plate material 2 of the step portion adjacent to this concave arc edge. The convex arc edges drawn by the forming edge are protruded into and adjacent to each other, and the above-described center dividing portion steel plate material 2 and left side dividing portion steel plate material 3,
The dimensional ratio of the width of the right side divided steel plate material 4 is such that the width of the center divided steel plate material 2 is equal to the overall width of the left and right divided steel plate materials 3 and 4 facing each other as described above. It is characterized by being set as follows.

The elbow according to the present invention includes a centrally divided steel plate material 2 for elbow forming, which has a shape obtained by cutting and removing the bending abdomen forming edges c and c-side portions of the left and right sides of the conventional steel plate material B in the longitudinal direction. , a joining edge 2a in which a left-side split steel plate material 3 for elbow forming and a right-side split thin steel plate material 4 for elbow forming, which have a shape corresponding to the cut and removed portion, are formed on these cut edges; It is characterized in that 2b, 3a, and 4a are melted together.

(Function) The center-split steel plate material 2 for elbow forming, the left-side split steel plate material 3 for elbow forming, and the right-side split thin steel plate material 4 for elbow forming that have been plated based on the method according to the present invention described above are The joining edge 2a of the central division steel plate material 2 and the joining edge 3a of the left division steel sheet material 3, and the joining edge 2b of the central division steel sheet material 2 and the right side. The joining edges 4a of the divided steel plate material 4 are welded and joined, and then a known compression molding process is performed. The welded portion Q of the joining edges 2a, 3a and the welded portion R of the aforementioned joined edges 2b, 4a are formed on the surface thereof. However, the existence of the welded part Q and the welded part R does not cause any problem in actual use as an elbow.

(Example) An example of the present invention will be described in detail with reference to the drawings as follows.

First, FIG. 4 shows a conventional steel plate material B that has a shape equal to the developed shape of a required elbow cut out from a steel plate of a fixed width.

In the figure, a is the edge for forming the upper end opening surface of the elbow, b is the edge for forming the lower end opening surface of the elbow, c and c are the edges for forming the bent abdomen of the elbow, and d is the bending edge of the elbow. The part for forming the back is shown.

Then, the steel plate material B for elbow forming was subjected to a curved compression forming process using a predetermined mold so that the left and right curved abdomen forming edges c and c sides were matched, and then they were made to match. The elbow is completed by welding the edges c and c for forming the bent abdomen.

The method for cutting a steel sheet material for elbow forming according to the present invention allows cutting of multiple sheets of steel sheet material as described above from a steel plate of a fixed width to be performed extremely rationally by minimizing the generation of residual material. This is how it was done.

Hereinafter, specific embodiments of the method according to the present invention will be described in detail with reference to the drawings.

FIG. 1 specifically shows the cutting form of a steel plate material for elbow forming based on the method according to the present invention.

In FIG. 1, reference numeral 1 denotes a steel plate having a predetermined width and a standard width, and is a material for continuously cutting out a plurality of steel plate materials for elbow forming.

The shape of the steel plate material for elbow forming in the steel plate 1 according to the method of the present invention is shown in the following arrangement.

Reference numeral 2 denotes a centrally divided steel plate material for elbow forming, and the centrally divided steel plate material 2 is made from the conventional steel plate material B shown in FIG. , and has a shape in which the c-side portions are cut and removed in the vertical direction.

3 is a left-side split steel plate material for elbow forming, 4 is a right-side split thin steel plate material for elbow forming, and the left and right split steel plate materials 3 and 4 are the remains after cutting and removing the center-dividing steel plate material 2 described above. It exhibits a shape corresponding to the part.

The left and right divided steel plate materials 3 and 4 are disposed with their bent abdomen forming edges c and c facing each other.

Here, the dimensional ratio of the widths of the above-mentioned center dividing portion steel plate material 2, left side dividing portion steel sheet material 3, and right side dividing portion steel plate material 4 is the width of the center dividing portion steel plate material 2,
As shown above, the left and right divided steel plate materials 3 facing each other,
The overall width of 4 is set to be equal to that of 4.
In other words, the width ratio of the center dividing portion steel plate material 2, the left dividing portion steel plate material 3, and the right dividing portion steel plate material 4 is 2:1:
It is set to be 1.

Then, the corresponding cutting edges on both the left and right sides of the center dividing portion steel plate material 2, the corresponding cutting edges of the left side dividing portion steel plate material 3 and the right side portion v1 portion steel plate material 4 match the both side edges of the steel plate 1 of the standard width described above. It is set to do so.

In other words, the width of the steel plate 1 is half the width of the conventional steel plate material B.

In addition, the corresponding edges of both the above-mentioned centrally divided steel sheet materials 2 and the corresponding edges of the left and right divided portions of the steel sheet materials 3 and 4 are joining edges 2a, 2b, 3a, and 4a, respectively. The joining edge 2a of the split steel plate material 2 and the joining edge 3a of the left-side split steel plate material 3, and the joining edge 2b of the center dividing steel plate material 2 and the right-side split steel plate material 4. edge 4
By welding and joining a, respectively, the central divided part steel plate material 2 and both left and right divided part steel plate materials 3 and 4 after said joining are as follows.
This means that it has the same shape as the conventional steel sheet material B.

In the method according to the present invention, the center dividing portion steel sheet material 2 is the first stage, and the left and right dividing portion steel sheet materials 3.4 arranged facing each other as described above are the second stage. are arranged alternately in the longitudinal direction of a steel plate 1 having a fixed width and are cut out.

That is, for example, the center dividing portion steel plate material 2 is used as the first stage,
When the left and right divided steel plate materials 3゜4 facing each other are arranged as the second stage, the center divided steel plate materials 2 are placed in all the odd numbered stages, and the left and right divided steel plate materials are placed in the even numbered stages. An alternate arrangement is adopted in which the materials 3 and 4 are placed.

The above-mentioned mutual adjacency of each stage is based on the edge for forming the upper end opening surface portion near the bending abdomen forming edge C2C portion of the opposing left and right divided steel plate materials 3 and 4. The edge for forming the upper end opening surface portion of the center dividing portion steel plate material 2 of the step portion adjacent to the concave arc edge jointly drawn by a, a or the lower end opening surface portion forming edge s, b, respectively. a
Alternatively, the convex arc edge drawn by the edge portion for forming the lower end opening surface portion is made to protrude and adjoin, and the plate is cut out.

As described above, by cutting the center dividing steel sheet material 2 and the opposite left and right dividing portion steel sheet materials 3 and 4 so that they are adjacent to each other without any gap, the generation of residual material due to the sheet cutting can be minimized. It will be done.

Next, the center division steel plate material 2, the left division part steel plate material 3, and the right division part 1 steel plate material 4, which have been cut out as described above, are used for predetermined joining as described above. The edges 2a, 2b, 3a, 4a are joined by welding or the like,
A steel sheet material having the same shape as the conventional steel sheet material B described above is formed.

By subjecting the steel plate material for elbow forming in such a joined state to a known compression molding process using a predetermined mold, an elbow as shown in FIGS. 2 and 3 is completed. .

In the same figure, P is the welded part of the bending abdomen forming edge C and C part of the left-side split steel plate material 3 and the right-side split steel plate material 4, and Q is the welded part of the C portion between the center-divided steel plate material 2 and the left-side split part. The welded portion R of the joining edges 2a and 3a of the steel sheet material 3 is the welded portion of the joining edges 2b and 4a of the central divided steel sheet material 2 and the right side divided steel sheet material 4.

The elbow according to the present invention has a configuration as shown in FIGS. 2 and 3, that is, as described above, from the conventional steel plate material B, the bending abdomen forming edges c and c of the left and right sides are bent in the vertical direction. A central division steel plate material 2 for elbow forming that has a shape that has been cut and removed, a left division steel plate material 3 for elbow forming, and a right division steel plate material 4 for elbow formation that have a shape corresponding to the cut and removed portion. The joint edges 2a, 2b, 3a, and 4a formed on these cut edges are melted to form an elbow.

Note that the above-mentioned compression molding process is performed in stages using a predetermined mold.

Conventionally, there are various methods for the compression molding process (for example, Japanese Patent Publication No. 35-8474, Japanese Patent Publication No. 35-8474,
-8475, Special Publication No. 35-15008, Special Publication No. 15008, Special Publication No. 44
In the present invention, any conventional compression molding means may be employed for the compression molding process.

(Effects of the Invention) The method for cutting a steel sheet material for elbow forming according to the present invention is to vertically cut and remove the edges c and c-side portions for forming bent abdomens on both left and right sides from the conventional steel sheet material B for elbow forming. The central divided steel plate material 2 for elbow forming has a shape corresponding to the cut and removed portion, and the bending abdomen forming edge portions c and c of the steel plate material 2 are arranged so as to face each other. A left-side split steel plate material 3 for elbow forming and a right-side split steel plate material 4 for elbow forming are attached to a steel plate 1 of a standard width.
Since the boards are arranged alternately in the longitudinal direction and adjacent to each other in multiple stages for boarding, the generation of leftover material due to the boarding is significantly reduced. Therefore, by reducing the amount of materials used, the product price can be significantly reduced.

In other words, with the conventional sheet cutting method as shown in FIG. 5, a steel plate material C for elbow forming having a shape equal to the developed shape of the required elbow is produced from a fixed length steel plate A, and the yield rate is low. is considered extremely bad,
According to the method according to the present invention, such triangular residual material C is not generated at all, so that the purpose of reducing the amount of materials used can be achieved.

Furthermore, the method for cutting a steel plate material for elbow forming according to the present invention is to adjust the width dimension ratio of the center dividing portion steel sheet material 2, the left side dividing portion steel sheet material 3, and the right side dividing portion steel sheet material 4 to the center dividing portion steel sheet material 4. Since the width of the steel plate material 2 is set equal to the overall width of the left and right divided steel plate materials 3 and 4 facing each other as described above, the steel plate of the standard width to be used is , one having half the width of the standard length steel plate A used in the past will suffice. In other words, the method according to the present invention does not have the limitation that the fixed-length steel plate A used must have a width equal to at least the width of the steel plate material B for elbow forming, which has arisen in the past. Even steel plates narrower than the specified width, which would have been discarded in the conventional method, can be used in the method according to the present invention.

The elbow according to the present invention includes a centrally divided steel plate material 2 for elbow forming, which has a shape obtained by cutting and removing the bending abdomen forming edges c and c-side portions of the left and right sides of the conventional steel plate material B in the longitudinal direction. , a joining edge 2a in which a left-side split steel plate material 3 for elbow forming and a right-side split steel plate material 4 for elbow forming, each having a shape corresponding to the cut and removed portion, are formed on these cut edges; The materials used in 2b, 3a, and 4a can be reduced by welding. The existence of the welded part between the central dividing part steel plate material 2 and the left and right divided part steel plate materials 3 and 4 does not pose any hindrance in the actual use of the elbow, so the existence of the welded part contributes to the above-mentioned reduction in the amount of materials used. It does not become a compensatory negative factor for achieving a positive effect.

[Brief explanation of the drawing]

The figures show one embodiment of the present invention, and FIG.
3 and 3 are perspective views of the method according to the present invention seen from the ventral side of bending, FIG. 3 is a perspective view seen from the side, and FIG. 4 is a plan view showing a conventional steel plate material B for elbow forming. FIG. 5 is a plan view showing a conventional method for cutting a steel plate material for elbow forming. 1... Steel plate with standard width 2... Steel plate material for the center division part for elbow forming 3... Steel plate material for the left division part for elbow forming 4... Steel plate material for the right division part for elbow forming 2a, 2b, 3a , 4a---Joining edge a...Edge b for forming the upper end opening surface of the elbow...
・Edges c, c for forming the lower end opening surface of the elbow... Edges d for forming the bending abdomen of the elbow... Parts for forming the bending back part of the elbow P... Welding parts of the edges for forming the bending abdomen Q: Welded portion R of the joining edge portion R: Welded portion A of the joined edge portion: Steel plate of standard width B: Conventional steel plate material patent applicant Nippon Benkan Kogyo Co., Ltd. Figure 3 Figure 2 Figure 4

Claims (2)

[Claims] (1) A center-divided steel plate material 2 for elbow forming, which has a shape obtained by vertically cutting and removing the bending abdomen forming edges c and c-side portions of the left and right sides of the conventional steel plate material B for elbow forming, and the cutting. A left-side split steel plate material 3 for elbow forming and a right-side split steel plate for elbow forming that have a shape corresponding to the removed portion and are arranged with their bent abdomen forming edges c and c facing each other. Material 4 and steel plate 1 of standard width
The corresponding cutting edges are aligned with the side edges of the steel plate 1, and are arranged alternately and in multiple stages in the longitudinal direction, and each cutting edge is connected to the joining edge 2a, 2b
, 3a, and 4a, and furthermore, the adjoining form of each stage is the bending abdomen forming edge c of the opposing left and right divided steel plate materials 3 and 4, and the upper end opening surface near the c part. The upper end opening surface portion of the central dividing portion steel plate material 2 of the step portion adjacent to the concave arc edge drawn jointly by the forming edges a, a or the lower end opening surface portion forming edges b, b. The convex arc edges drawn by the forming edge a or the lower end opening surface forming edge b are protruding and adjacent to each other, and the above-described center dividing portion steel plate material 2 and left side dividing portion steel plate material 3, Right side division steel plate material 4
The dimensional ratio of the width of the center dividing portion steel plate material 2 is set so that the width of the center dividing portion steel plate material 2 is equal to the overall width of the left and right dividing portion steel plate materials 3 and 4 facing each other as described above. Features: A method for cutting steel plate material for elbow forming. (2) A centrally divided steel plate material 2 for elbow forming, which has a shape obtained by cutting and removing the bent abdomen forming edges c and c-side portions of the left and right sides of the conventional steel plate material B in the longitudinal direction, and the cut and removed parts. At the joining edges 2a, 2b, 3a, 4a formed on the above-mentioned cutting edges, the left-side split steel plate material 3 for elbow forming and the right-side split steel plate material 4 for elbow forming, which have shapes corresponding to the parts, are formed. An elbow characterized in that it is press-formed using steel plate materials for elbow forming that are welded together.