JPH04228202A - Manufacture of channel material - Google Patents

Abstract

PURPOSE:To prevent the roughening of the external surface of the channel material at the time of forming process. CONSTITUTION:First, a stainless steel blank 11 is bent into a U-shape in cross section, and a bending process for an intermediate member 14 of which a web part and a flange part are approximately at right angle is performed. Then, a rolling-down process in which the intermediate member 14 is rolled down mainly in the direction of the thickness to have a final thickness is performed. After that, a shaping process in which the member is bent into the final shape for the channel material is performed. In this manner, since the bending process, the rolling down process in the direction of the thickness, and the final shaping process are independently performed, no excess force between a cavity die and a workpiece is generated. Consequently, the manufactured channel material does not have the rough surface.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing channel materials used in factories, buildings, etc.

0002

BACKGROUND OF THE INVENTION Channel materials are widely used in chemical plants, buildings, etc. In particular, stainless steel channel materials are suitable for nuclear fusion and
Nuclear and chemical plants, swimming pool materials, curtain walls, buildings such as public notice towers, decorative building materials such as showcase frames and elevator interiors, as well as refrigerator frames, kitchen equipment, tank reinforcing materials, medical equipment, etc. It is used in the field of In addition, from a similar perspective, channel materials made of titanium have recently been manufactured, and the fields of use are expanding. By the way, conventionally, channel materials are often manufactured by the method shown in FIG. This method uses billet 71, which is the raw material,
For example, the channel material 75 is formed using hole molds K5 to K1. In the above manufacturing,
The billet 71 is formed into a skewer-like body having two protrusions using K5, and then bent downward using K4, using the protrusions as bending parts. Next, both sides are further bent at K3 and K2, and the final channel material product is obtained at K1. The hole shapes above are representative ones.
Actually, about 14 hole molds are used for molding. What is important here is that in K4 to K1, the above-mentioned bending process is performed on the above-mentioned material, and at the same time, reduction forming for thickness adjustment is performed on the above-mentioned material. The above-mentioned "bending and pressure forming" in K4 to K1 is performed using a forming roll 8 shown in FIG. 3. The roll 8 consists of an upper roll 81 and a lower roll 82. The upper roll 81 is
It has a concave slope 810 for forming the outer surface of the web and flange portions of the channel material 75, and a right-angled bottom surface 815 for forming the outer corner of the channel material. On the other hand, the lower roll 82 has a concave inclined portion 810 of the upper roll.
and a right-angled protruding surface 825 facing the right-angled bottom surface 815 for forming a convex inclined portion 820 and an inner corner of the channel material.
has. Both rolls 81 and 82 are configured so that when they are opposed to each other, the above-mentioned hole shapes K4 to K1 are formed. Note that FIG. 3 shows the state of the hole K3.

0003

[Problem to be Solved] However, the channel material 75 (Fig. 5) obtained by the above-mentioned conventional manufacturing method has a problem that during its manufacturing process and in the finished product, as shown in Figs. 4 and 5, the channel material 75 (Fig. That skin 751,752
is occurring. This roughness is caused by many thin concave portions being formed intermittently in the longitudinal direction of the channel material. The causes of such rough skin are considered to be as follows after various considerations. That is, as mentioned above, "bending and pressure forming" is performed in the rear process of forming the channel material. The hole types are K4 to K1 (Fig. 2
), and the forming roll 8 shown in FIG. 3 is used. At this time, for example, in the hole mold K3, the inner surface of the intermediate molded product 73 is in strong contact with the convex inclined surface 820 and the right-angled projecting surface 825 of the lower roll 82, as shown in FIG. On the other hand, the outer surface is the concave inclined portion 8 of the upper roll 81.
10 and the right-angled bottom surface 815. The intermediate molded product 73 is formed by the upper roll 81 and the lower roll 82.
It is sent forward while being bent and pressed. That is, during this molding, the intermediate molded product 73 is bent in its entirety toward a perpendicular state on both sides, and simultaneously subjected to reduction rolling to obtain a predetermined thickness. As shown in FIGS. 3 and 6, the bending to the right angle state is mainly performed at the tip end portion 810A of the concave inclined portion 810 of the upper roll 81. Further, the reduction rolling is mainly performed at the base of the concave inclined portion 810 of the upper roll 81, that is, the right-angled bottom surface 81.
This is done until around 5. Furthermore, since these bending and rolling operations are performed with a strong force, a strong frictional state occurs between the intermediate molded product 73 and the tip portion 810A and the base portion of the upper roll 81. Therefore, the above upper roll 8
As described above, rough skin 751, 752 will occur on the outer surface of the intermediate molded product 73 facing the tip and base of the molded product 1. The rough skin 751, 752 occurs linearly in the longitudinal direction of the channel material 75 (FIG. 5). As mentioned above, the rough skin is an inconvenient surface condition for channel materials made of stainless steel, titanium, etc., which are used with emphasis on surface appearance. In view of these conventional problems, the present invention aims to provide a method for manufacturing a channel material that does not cause roughness on the outer surface.

0004

[Means for Solving the Problems] The present invention provides a method for manufacturing a channel material in which a web portion and flange portions located on both sides of the web portion are in contact with each other at right angles. It is characterized by consisting of a bending process in which the intermediate member is formed at a substantially right angle to the flange part, a rolling process in which the intermediate member is rolled down in the thickness direction, and a forming process in which the intermediate member is bent into the final shape of the channel material. There is a method for manufacturing a channel material. In the present invention, the bending step is a processing step in which a material such as a billet is heated and the boundary formed portion between the web portion and the flange portion is bent into a substantially right angle shape. At this time, the material is mainly bent so that the web part forming part and the flange part forming part are approximately perpendicular to each other, and the original shapes of the web part and flange part to constitute the channel material are created. go. and,
The intermediate member obtained in this bending process has a web portion and a flange portion that are substantially perpendicular, but the thickness of these portions is considerably thicker than the thickness of the final shape of the channel material. Next, in the rolling step, the intermediate member is rolled down in its thickness direction to approximately the final thickness of the channel material. This is then bent into the final shape of the channel material in a forming process. The above bending process is performed using, for example, 5 to 7 holes. Further, the rolling step is performed using, for example, four to six hole molds. Moreover, the molding process is performed using 4 to 8 hole molds. Further, although it is preferable that these processing steps be performed hot, the processing temperature is not limited. Moreover, the present invention
Although it can be applied to the manufacturing method of channel materials for general steel materials, it is particularly effective for stainless steel and titanium materials where appearance is important and difficult to process.

[0005]

[Operations and Effects] As described above, in the present invention, a material such as a billet is first bent at a substantially right angle at the boundary between the web portion and the flange portion at the initial stage of processing, and then the material is rolled down to the desired thickness of the channel material. Then, it is formed into the shape of the channel material. Therefore, the bending force and the rolling force are not applied to the workpiece at the same time, unlike when "bending and rolling" are performed at the same time as in the prior art. Therefore, in the present invention, the workpiece is smoothly first bent into a substantially right angle shape, then rolled down to the desired thickness, and then formed into a channel shape. Therefore, strong frictional force due to conventional forced machining is unlikely to occur between the hole mold and the workpiece, and the resulting channel material will not have roughness. As described above, according to the present invention, it is possible to provide a method for manufacturing a channel material that does not cause roughness on the outer surface.

[0006]

EXAMPLE A method for manufacturing a channel material according to an example of the present invention will be explained with reference to FIG. The channel material to be obtained in this example has approximately the same cross-sectional shape as the hole type E shown in the figure. In manufacturing the above channel material, as shown in Figure 1, the material 1
1 is sequentially molded using hole molds A to E. Hole shapes A to E shown here indicate typical hole shapes used during processing. Moreover, the hole shape E indicates the hole shape of the final step. Then, in hole type A, the upper and lower center areas of the material 11 are slightly recessed, and in hole type B, both lower ends are widened and bent into an inverted W shape. Further, in the hole type C, bending is further performed to obtain an intermediate member 14 in which the boundary between the web portion and the flange portion is bent at a substantially right angle. With the above steps, the bending process is completed. Next, the intermediate member 14 is transferred to a rolling process, in which the entire intermediate member 14 is rolled down in the thickness direction in the hole D.
Processed to the final desired thickness. Thereafter, the entire structure is formed into a U-shape in the hole mold E, and the channel material 16 is obtained. Also, as can be seen from the figure, the bending process is a process in which the material is bent approximately at right angles at the boundary between the web part and the flange part, but at this time, the thickness of both sides becomes slightly thinner (for example, Pore type C). In addition, in the above, hole types A to C are shown as holes used in the bending process, hole type D is shown as a hole used in the rolling process, and hole type E is shown as a hole used in the forming process. Generally, it is preferable to use 5 to 7 holes in the bending process, 4 to 6 holes in the rolling process, and 4 to 5 holes in the forming process. Next, a specific example will be explained. In this example, the material 11 is a stainless steel billet (SUS304) with a thickness of 125 mm and a width of 125 mm. The material was heated to 1080° C. and fed into the hole mold A. Then, the bending process was sequentially performed to obtain a substantially right-angled intermediate member 14. At this time, the temperature of the intermediate member 14 was approximately 950°C. Next, the intermediate member 14 was supplied to a rolling process. Finally, it was molded into a channel material by a molding process using hole mold E. At this time, the temperature of the channel material was approximately 800°C. In addition, the obtained channel material is
The thickness of the web part and flange part is approximately 100 mm, the length of the outer surface of the web part is approximately 50 mm, and the thickness is 6 mm.
Met. Further, in the obtained channel material, no roughness was observed as in the case of the prior art (FIG. 5).

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of a hole mold used in a method for manufacturing a channel material in an example.

FIG. 2 is an explanatory diagram of a hole shape in a conventional manufacturing method.

FIG. 3 is a front view of a conventional forming roll.

FIG. 4 is a perspective view of an intermediate member having rough skin according to a conventional method.

FIG. 5 is a perspective view of a channel material with rough skin obtained by a conventional method.

FIG. 6 is an explanatory diagram of bending and pressure forming by a conventional method.

[Explanation of symbols]

Claims (1)

[Claims] Claim 1: A method for manufacturing a channel material in which a web portion and flange portions located on both sides of the web portion are in contact with each other at right angles, in which the material is bent into a U-shaped cross section so that the web portion and the flange portions are approximately in contact with each other. A channel material characterized by comprising a bending step of forming an intermediate member at right angles, a rolling step of rolling down the intermediate member in the thickness direction, and a forming step of bending it into the final shape of the channel material. Production method.