JPS60255216A - Production of curved shape material - Google Patents

Abstract

PURPOSE:To obtain simultaneously plural curved shape materials having stable accuracy by forming a shape material provided successively with plural shape materials in separable parts by extrusion and bending such shape material to separate the separable parts. CONSTITUTION:The extruded shape material 2 is fitted with a resin core material into the hollow inside part formed of respective projecting pieces 3a, 4a, 3b, 4b and separable parts 5, 6 and is bent by a roll bender, etc. The parts 5, 6 are separated along the boundary parts 5a, 6a, by which the two curved shape materials 3', 4' subjected to bending are simultaneously obtd.

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a method for manufacturing a curved section, which allows a plurality of curved sections in good condition to be written at the same time. be.

(Prior Art) It is generally known that bending of curved sections is difficult when manufacturing curved sections. For example, as shown in Fig. 1, -
When bending a section 1 that has a substantially U-shaped cross section with one side long, the vector of the bending moment is inclined with respect to the main axis, making the open side of the cross section unstable against bending. Therefore, the profile 1 becomes easily distorted and deformed.

Therefore, in the past, a method was adopted in which a core material was inserted into the inside of the section 1 and the bending process was performed while applying a tensile force to the section 1, but such bending was performed by the operator. In addition, the process was complicated and the accuracy of the curved shapes produced could become unstable, as the process was complicated and the precision of the curved shapes produced was unstable, as the bending equipment was loaded with the shapes made by hand, making detailed adjustments for each individual piece. However, there was also the problem of poor productivity.

(Purpose of the Invention) The present invention has been made by focusing on the above-mentioned problems of the conventional art. The purpose of the present invention is to provide a highly productive method for manufacturing curved shapes, which can simultaneously assemble multiple curved shapes with stable precision and improve work efficiency by integrally molding them.

(Structure of the Invention) A method for manufacturing a curved shape member according to the present invention includes extrusion molding a plurality of shapes as a shape member in which a plurality of shape members are consecutively connected with a peelable part, and then bending the extruded part, and then It is characterized by the fact that a plurality of curved shapes can be obtained at the same time by peeling.

(Example 1) The present invention will be explained below based on the drawings.

FIGS. 2 and 3 are diagrams illustrating an embodiment of the present invention.

That is, the extruded shape member 2 shown in FIG. 2 is made of a light metal such as aluminum, and includes a shape member 3 that is open on one side and has two projecting pieces 3a and 3b projecting approximately parallel to one side, and the shape member 3. A pair of left and right shaped members 4 having the same cross section as the shape members 4 are arranged with their opening sides facing each other, and the tips of the protrusions 3a, 4a, 3b, 4b are connected to each other via peelable peeling parts 5 and 6. It is integrally extruded and has the above-mentioned cross-sectional shape.

Note that the protruding pieces 3a and 4a on one side are similar to the protruding pieces 3b and 4 on the other side.
It is formed longer than b.

Further, the boundary portions 5a, 6a between the protrusions 3a, 4a, 3b, 4b and the respective peeling portions 5.6 are formed into a thin shape to facilitate subsequent peeling.

The extruded shape member 2 formed in this way has, for example, each protruding piece 3a.
, 4a, 3b, 4b and the peeled portion 5.6, a resin core material (shown by the imaginary line in FIG. 2) is placed inside the hollow formed by the peeled portion 5.6.
is inserted and bent using a roll bending device or the like, and then, as shown in FIG. Two curved sections, s/, 41, are obtained simultaneously.

That is, the curved profile 3' obtained as described above.

If you try to bend a section with the same cross-section as 4' alone, the center of rotation for bending (lower part in Figure 3) will change due to the different lengths of the protrusions.
The vector of the bending moment from is inclined with respect to the main axis of the section, resulting in twisting and warping, but in this embodiment, both sections 3,
4 in a row, the extruded section 2 has a symmetrical cross section, so the main axis of the extruded section 2 is parallel to the rotation center axis and coincides with the bending moment vector, preventing twisting and warping during bending. will not occur.

As the core material, conventional resins, iron grains, sand grains, low melting point alloys, etc. are used, and especially when a resin core material is used, the core material can be removed by removing the peeled parts 5 and 6. The core material can be easily removed and the core material can be reused.

Moreover, if the oxide film treatment is performed with one peeled part 6 removed, and then the other peeled part 5 is removed,
It is possible to reduce the hanging area and the number of hanging steps during oxide film treatment.

(Example 2) FIG. 4 is a diagram illustrating another embodiment of the invention.

That is, in this extruded section 12, a section 4 having the same cross section is connected to the section 3 whose bending moment vector is inclined with respect to the main axis because it is open on one side through one peeled part 12a. By making the cross-sectional shape bilaterally symmetrical, the main axis of the cross-section is parallel to the center axis of bending rotation, and at the same time, it is formed to match the vector of the bending moment. And opposing protrusions 3a, 4a
.

The longer protrusions 3a and 4a of the protrusions 3b and 4b are arranged in series, and the tips of the shorter protrusions 3b and 4b remain separated from each other.

The extruded section 12 thus formed is also bent in the same manner as in the previous embodiment, and then the two sections 3 and 4 are obtained by peeling off the peeled portion 12a.

In this way, if the vector of the bending moment with respect to the cross-sectional shape of the extruded section 12 matches the main axis of the extruded section 12, twisting and warping are less likely to occur, and good bending can be performed. It is also possible to improve the material yield by saving the peeling part as in the above embodiment.

In addition, in the examples, the means of bending is not limited, and may include draw benders, roll pengu,
Alternatively, it is possible to use various bending means such as a three-point roll.

Furthermore, in the Example, the same-shaped sections 3 and 4 were integrally extruded, but it is also possible to integrally mold sections with different cross-sectional shapes as a pair, for example, in the same assembly. If the sections to be assembled are paired and integrally molded, the bending process can be performed at the same time, which has the advantage of very high assembly accuracy.

(Effects of the Invention) As explained above, according to the method for manufacturing a curved shape member of the present invention, a plurality of shape members are extruded as a shape member connected in a row with a peelable part, and the extruded shape member is After bending, the peeled portion is peeled off to obtain multiple curved shapes at the same time, so during extrusion molding, the cross-sectional shape can be made in a well-balanced main axis state with respect to the bending moment vector. , Extruded sections formed in this way are advantageous in performing stable bending processes, making it possible to obtain multiple curved sections with stable accuracy at the same time, as well as increasing work efficiency and productivity. This has the effect of significantly improving

[Brief explanation of drawings]

FIG. 1 is a perspective view illustrating a bent state of a shape with an opening on one side, FIG. 2 is a sectional view illustrating an extruded shape according to an embodiment of the present invention, and FIG. FIG. 4 is a perspective view illustrating a state in which the extruded section is peeled off after bending of the extruded section, and FIG. 4 is a sectional view illustrating an extruded section according to another embodiment of the present invention. 2.12...Extruded shape material 3.4...Shape material (curved shape material) 5.6.12a...Peeling section patent applicant Yutaka Oshio, patent attorney representing Sankyo Aluminum Industry Co., Ltd. Proceedings amendment Book 21 Name of the invention Method for manufacturing curved sections 3 Relationship with the case of the person making the amendment Patent applicant name Sankyo Aluminum Industry Co., Ltd. 4 Agent address (residence) 104 Ginza 2, Chuo-ku, Tokyo No. 8-9 Kobikikan Ginza Building Telephone 03 (5B?) 2? f (No. 1 (Representative) 6, Number of inventions increased by the amendment 7, Detailed explanation of the invention in the specification subject to the amendment 8, Contents of the amendment As shown in the appendix ■, Page 1 of the specification, line 17 ~ Edit page 2, line 7 as follows: [It is well known that bending is difficult, and in order to prevent twisting and warping that occur during bending, for example, inserting a core material inside the shape is necessary. At the same time, a method is adopted in which bending is performed while applying a tensile force to the section.In particular, as shown in Fig. 1, a section having a substantially U-shaped cross section with one side long When bending process 1 is performed, the vector of the bending moment of the profile 1 is inclined with respect to the main axis. The reality is that it is difficult to obtain a practical curved material using conventional methods, as bending and warping may occur.Furthermore, regardless of the shape of the material, the above-mentioned bending process requires the experience of the operator. I rely on a lot of people.'' Yutaka Oshio, Patent Attorney

Claims (1)

[Claims] (1) Extrusion molding a plurality of shapes as continuous shapes with peelable peeling parts, bending the extruded shapes, and then peeling off the peeling parts to obtain a plurality of curved shapes at the same time. A method for manufacturing a curved shape material characterized by: