JPH0356125B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) When forming an elbow using a steel plate as a raw material, the present invention is capable of cutting out a plurality of steel plate materials for elbow forming from a steel plate of a fixed width, in order to eliminate residual material. A method for cutting a steel plate material for elbow forming, which is characterized in that it can be carried out extremely rationally by minimizing the occurrence of the occurrence of the occurrence, thereby achieving a significant reduction in the amount of materials used and manufacturing costs. It is related to.

(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 a steel plate is used as a material, the steel plate material for elbow forming is cut out from a steel plate of a fixed width, and then the elbow is completed by compression forming using a specified mold. .

(Problems to be Solved by the Invention) When an elbow is formed from a steel pipe as described above, there is no waste of materials used.

However, when forming an elbow using a steel plate as a material, as shown in FIG. In order to form the material, as shown in the figure, a triangular residual material C is inevitably created between each punched material.
The yield was considered to be extremely poor.

In recent years, expensive stainless steel sheets have been widely used as the material for forming elbows, and the poor yield of these materials has led to
This had no choice but to lead directly to soaring product prices.

The present invention aims to solve the problems that conventionally occurred when elbows were formed using steel plates as described above.

(Means for Solving the Problems) In order to achieve the above-mentioned object, the method according to the present invention uses a steel plate 1 of a regular width whose width matches the width of a steel plate material for forming an elbow, and steel plate 1
On the other hand, the main steel plate material 2 for elbow forming has a shape obtained by cutting and removing the portion near the edge c for forming one bent abdomen in the longitudinal direction from the conventional steel plate material B for elbow forming.
and a secondary steel plate material 3 for elbow forming, which has a shape corresponding to the cut and removed portion of the main steel plate material 2, are arranged with their bending abdomen forming edges c and c facing each other. Further, the edge side of the steel plate 1 is used as the joining edges 2a and 3a of the main steel plate material 2 and the secondary steel plate material 3, and furthermore, the main steel plate material 2 and the secondary steel plate material 3 are opposed to each other. The left and right reversed pieces are placed adjacent to each other, and they are arranged alternately and in multiple stages in the longitudinal direction of the steel plates 1 of a fixed width, and the adjoining form of each stage is set to the opposite main steel plate material 2. An edge c for forming a bent abdomen in the secondary steel plate material 3, an edge a for forming an upper end opening surface portion near the c portion,
In the concave arc edge jointly drawn by the edges b and b for forming the upper end opening surface portion a or the lower end opening surface portion forming edge a or the lower end opening surface of the main steel plate material 2 of the step adjacent to this The convex arc edge drawn by the partial forming edge b protrudes and adjoins, and the main steel plate material 2 and the secondary steel plate material 3 are cut from the steel plate 1 in the multi-stage arrangement state as described above. It is characterized by the fact that

(Function) The main steel plate material 2 for elbow forming and the secondary steel plate material 3 for elbow forming, which are plated based on the method according to the present invention described above, have mutual joining edges 2a, 3.
a are welded and connected, and then a known compression molding process is performed to form an elbow. As shown in FIGS. 2 and 3, the molded elbow has the above-mentioned joining edges 2a, in addition to the welded portions P of the bending abdomen forming edges c and c formed in a normal elbow. A welded portion Q of 3a will be formed on the surface. However, the existence of the welded part Q,
This should not cause any problems when used 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 cut from a steel plate having 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
indicates the part for forming the bending back of the elbow.

Then, the steel plate material B for elbow forming is made using a predetermined mold, and the left and right bending abdomen forming edges c,
The elbow is completed by applying a curved compression molding process to match the c side, and then welding the matched curved abdomen forming edges c and c.

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, 1 is a steel plate with a fixed width whose width matches the width of the steel plate material for elbow forming, and is a material for continuous cutting of a plurality of steel plate materials for elbow forming. be.

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

2 is a main steel plate material for elbow forming, and the main steel plate material 2 is made from the conventional steel plate material B shown in FIG.
It has a shape in which the closer portion is cut and removed in the vertical direction. 3 is a secondary steel plate material for elbow forming, and the secondary steel plate material 3 is the main steel plate material 2 described above.
The shape corresponds to the cut and removed portion. The main steel plate material 2 and the secondary steel plate material 3 are arranged with their respective bending abdomen forming edge portions c and c facing each other.

Furthermore, the edge side of the steel plate 1 is connected to the joining edges 2a, 3a of the main steel plate material 2 and the secondary steel plate material 3.
By welding the joining edges 2a and 3a to each other and joining both steel plate materials 2 and 3, a steel sheet material identical to the conventional steel sheet material B described above is formed. .

In the method according to the present invention, the main steel plate material 2 and the secondary steel plate material 3, which are arranged facing each other as described above, are
The main steel plate material 2 and the secondary steel plate material 3 in a form in which the opposed arrangement form is reversed left and right are made into a second stage, and the objects in the form in which the left and right sides are reversed are placed adjacent to each other, The steel plates 1 are arranged alternately in the longitudinal direction of a steel plate 1 having a fixed width and are cut out.

In other words, if the arrangement is such that, for example, the main steel plate material 2 is located on the right side as the first stage, and the main steel plate material 2 is located on the left side as the second stage, the odd number In the case of tiers, the main steel plate material 2 is located on the right side, and in the case of even-numbered tiers, the main steel plate material 2 is located on the left side, so that an alternate arrangement is adopted.

The above-mentioned mutually adjacent form of each stage is for forming the upper end opening surface portion near the bending abdomen forming edge c, c of the opposing main steel plate material 2 and secondary steel plate material 3. Edges a, a or lower end opening surface portion forming edges b, b jointly draw a concave arc edge, and the upper end opening surface portion forming edge a of the main steel plate material 2 of the step adjacent to this Alternatively, the convex arc edge drawn by the edge b 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 main steel sheet material 2 and the secondary steel sheet material 3 so that they are adjacent to each other without any gap, the generation of residual materials due to the sheeting process can be minimized.

Next, the main steel plate material 2 for elbow forming and the secondary steel plate material 3, which have been cut out as described above, are joined by welding the joining edges 2a and 3a of each other, as described above. The steel sheet material is formed into a steel sheet material having the same shape as the conventional steel sheet material B.

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 figure, P is the welded part of the edges c and c for forming the bending abdomen of the main steel plate material 2 and the secondary steel plate material 3, and Q is the welding part for joining the main steel plate material 2 and the secondary steel plate material 3. This is the welded portion of the edges 2a and 3a.

(Effects of the Invention) The method for cutting a steel sheet material for elbow forming according to the present invention has a shape in which the portion nearer to the edge c for forming one bent abdomen is cut and removed in the longitudinal direction from the conventional steel sheet material B for elbow forming. Main steel plate material 2 for elbow forming
and a secondary steel plate material 3 for elbow forming, which has a shape corresponding to the cut and removed portion of the main steel plate material 2, are arranged with their bending abdomen forming edges c and c facing each other. , Also, the following steel plate 1
The edge side is the joining edge 2a, 3a of the main steel plate material 2 and the secondary steel plate material 3, and furthermore, the facing form of the main steel plate material 2 and the secondary steel plate material 3 is reversed left and right. Since the steel plates 1 of a fixed width are arranged alternately and in multiple stages in the longitudinal direction of the steel plates 1 adjacent to each other and are cut out, the generation of residual material due to the cutout is significantly reduced. It happens.
Therefore, by reducing the amount of materials used, the product price can be significantly reduced.

In other words, in the conventional sheet cutting method as shown in FIG. 5, a steel plate material B for elbow forming, which has a shape equal to the developed shape of the required elbow, is continuously punched out from a fixed length steel plate A. As shown in the figure, a triangular residual material C was inevitably formed between the punched materials and the yield was extremely poor, but according to the method according to the present invention, Since such triangular residual material C is not generated at all, the purpose of reducing the amount of materials used is achieved.

In other words, the method according to the present invention uses, as a steel plate for cutting, a steel plate 1 with a standard width that matches the width of the steel plate material for forming an elbow. That is, a very unique method is used in which a steel plate 1 with dimensions that can be cut from a normal elbow-forming steel plate material is used, but the elbow-forming steel plate material is purposely cut into segments.

Moreover, the divided form corresponds to the main steel plate material 2 for elbow forming, which has a shape in which the portion near the edge c for forming the bent abdomen is cut and removed in the longitudinal direction, and the cut and removed portion of the main steel plate material 2. The secondary steel plate material 3 for elbow forming is divided into two parts, and is then put into the state as described above, that is,
``Both steel plate materials 2 and 3 are arranged with their respective bending abdomen forming edge portions c and c facing each other, and the edge side of steel plate 1 described below is placed in both steel plate materials 2 and 3. The joining edges 2a and 3a are used as joining edges 2a and 3a, and the main steel plate material 2 and the secondary steel plate material 3, which are left and right reversed, are placed adjacent to each other and alternately in the longitudinal direction of the steel plate 1 of a standard width. By arranging the boards in multiple stages and removing the boards, it is possible to achieve the purpose of board removal in an extremely rational and economical manner without producing the triangular residual material C as described above. It will be.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, in which FIG. 1 is a plan view showing a form of board cutting based on the method according to the present invention, and FIGS. This figure shows an elbow formed using the main steel plate material 2 and the secondary steel plate material 3 used for forming the elbow. Fig. 2 is a perspective view as seen from the bending vent side, and Fig. 3 is a side view. FIG. 4 is a plan view showing a conventional steel plate material B for elbow forming, and FIG.
The figure is a plan view showing a conventional method for cutting a steel sheet material for elbow forming. 1... Steel plate with standard width, 2... Main steel plate material for elbow forming, 3... Subordinate steel plate material for elbow forming, 2a,
3a... Edge for joining, a... Edge for forming the upper end opening surface of the elbow, b... Edge for forming the lower end opening surface of the elbow, c, c... Edge for forming the bent abdomen of the elbow, d...Edge for forming the bending back of the elbow, P...
...Welded part of the edge part for forming the bent abdomen, Q... Welded part of the edge part for joining, A... Steel plate of standard width, B...
…Conventional steel plate material.

Claims (1)

[Claims] 1 Using a steel plate 1 with a standard width whose width matches the width of the steel plate material for forming an elbow, from the conventional steel plate material B for forming an elbow to the steel plate 1, a portion closer to the edge c for forming one bent abdomen is used. A main steel plate material 2 for elbow forming, which has a shape obtained by cutting and removing the material in the longitudinal direction;
A secondary steel plate material 3 for elbow forming, which has a shape corresponding to the cut and removed portion of the main steel plate material 2, is arranged with the edges c and c portions for forming the bent abdomen facing each other, and , the edge side of the steel plate 1 is used as the joining edge 2a, 3a of the main steel plate material 2 and the secondary steel plate material 3, and furthermore, the facing configuration of the main steel plate material 2 and the secondary steel plate material 3 is reversed left and right. Steel plates 1 of standard width are placed adjacent to each other.
are arranged alternately and in multiple stages in the longitudinal direction, and the adjoining form of each stage is set at the bending abdomen forming edges c, c of the opposing main steel plate material 2 and secondary steel plate material 3.
In the main steel plate material 2 of the step adjacent to the concave arc edge jointly drawn by the edges a, a for forming the upper end opening surface part or the edges b, b for forming the lower end opening surface part closer to the part, The convex arc edge drawn by the upper end opening surface portion forming edge a or the lower end opening surface portion forming edge b is pushed in and adjacent to the main steel plate material 2 and the secondary steel plate material 3.
A method for cutting a steel plate material for elbow forming, which comprises cutting the steel plate 1 from the steel plate 1 in the multi-stage arrangement state as described above.