JPS61259801A - Working method for long-sized shape material - Google Patents

Abstract

PURPOSE:To obtain a product having a good shape and dimensional accuracy by using slitting rolls each having a specific tip angle, specifying the ratio of the indentation for each one pass with respect to the outside diameter thereof and repeating slitting until the desired depth is attained thereby expanding forcibly the slit part to both sides. CONSTITUTION:A belt-like mild steel plate 3 is supplied to plural stages of slitting stands where the tip of the slitting roll 2 is forced into the plate 3 from the longitudinal edge 3a thereof and the slit bisecting the thickness (t) is continuously formed as the plate 3 moves. Such slitting is executed under the conditions of 55-65 deg. tip angle (2theta) of the roll 2 and <=4/220 ratio of the indentation for each one pass with respect to the outside diameter and therefore the slit 7 having the desired depth is formed without cracking in each stage of the slitting stands. The rolls 2 are so worked as to maintain the above- mentioned ratio at >=3/220 in the case of using the slitting rolls having 40-55 deg. and 65-90 deg. tip angle (2theta). The plate 3 passes through several stages of the slit expanding stands, by which the slit part of the plate 3 is forcibly expanded to both sides and flange parts are formed.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a method for processing elongated sections such as T-shaped or I-shaped sections, and particularly relates to a method for processing elongated sections having a surface shape with good accuracy in one dimension. The present invention relates to a method of processing a long shape material suitable for processing at low cost.

[Background of the invention]

As a method for processing long shapes, for example, Japanese Patent Application Laid-Open No. 57-1
As shown in Japanese Patent No. 95201, a method of hot die rolling has been conventionally used. Although this method is excellent in mass production, the surface of the processed elongated shape is There were problems with shape and dimensional accuracy. In addition, since an expensive heating furnace is required as processing equipment, processing costs are high, which is a problem that should be further improved. Therefore, it is an object of the present invention to provide a method for processing an elongated material that can be processed easily and inexpensively into an elongated material with good surface shape and dimensional accuracy.

[Summary of the invention]

The structure of the method for processing a long shaped material according to the present invention is such that a slit can be made continuously from one longitudinal edge of a belt-shaped mild steel plate to the opposite longitudinal edge to divide the plate thickness into two. When a slit part is processed using a disc-shaped slit roll that has a wedge shape, and the slit part is pushed out to both sides, the angle 2θ of the tip is 55. ° ~ 65' O S IJ roll is used, the indentation amount idO ratio Δd/D per bath to the outer diameter of the slit meal is approximately 4/220 or less, or the angle 2θ of the tip is 40 ° ~ 55 °, 65'
~90° slit roll is used, and the ratio Δd/D is approximately 5.
/220 or less, and the slit processing is repeated until a slit portion with a desired depth is obtained.

[Embodiments of the invention]

Before entering into the description of the embodiments, basic matters related to the present invention will be explained with reference to the drawings.

FIG. 1 is a schematic cross-sectional view showing an example of a slitting stand used for carrying out the method of processing a long shape according to the present invention;
FIG. 2 is a sectional view showing an example of a belt-shaped mild steel plate processed by the slitting stand according to FIG. 1, and FIG.
The tip angle 2θ of the slit roll in Fig. 1 and the second
2θ-L showing the relationship with the crack depth t in the figure.
It is a line diagram.

In FIG. 1, 5 is a belt-shaped mild steel plate, and 2 is a belt-shaped mild steel plate 5, in which slits 7 are continuously inserted from one longitudinal edge 5α to the opposite longitudinal edge 5b to divide the plate thickness t into two. 5α is a bottom holding roll that supports the side opposite to the side where the slit 7 of the belt-shaped mild steel plate 5 is inserted, and 4α is a , is a side holding roll that holds both sides of the strip-shaped mild steel plate 50. .

By using the slitting stand configured in this manner, the slitting roll 2 is pushed from one longitudinal edge 5b of the belt-shaped mild steel plate 5 toward the opposing longitudinal edge 5h, and each of the rolls 2, 4α, and 5cL is rotated. By moving the belt-shaped mild steel plate 5 in the longitudinal direction (in the direction perpendicular to the paper plane in FIG. 1), the slits 7 can be continuously formed.

In the process of making this slit 7, if the pushing amount Δd per bus (the process of making a slit in one pass with one slit roll is called 1 bus) is increased, as shown in Fig. 2 (α).
As shown in the figure, a crack 8 with a depth t occurs on the wall surface. FIG. 2(h) is an enlarged view of the vicinity of the crack 8 in FIG. 2(α).

The inventors of Kawamoto et al.
) and the ratio Δd/D of the indentation amount Δd of one bath to the outer diameter of the slit meal 2, the strip-shaped mild steel plate 5 (carbon content c = 0.
The occurrence of cracks 8 was investigated when slits 7 were formed in a strip-shaped mild steel plate of 06'16 (10IIK plate thickness). The results are shown in FIG. 5, with the horizontal axis representing the tip angle 2θ and the vertical axis representing the flaw depth t of the crack 8, respectively.

From this FIG. 5, the tip angle 2θ is 55° to 65°.

Using lit roll 2, the ratio Δ (1/D is approximately 4/220
If you process it as follows, there will be no cracks. Also, the tip angle 2θ is 40° to 55°, 65-90″
using a slit roll 2 with a ratio Δd/D of approximately 4/22.
It has been found that if the process is made so that the value is 0 or less, no cracks will occur. This was true regardless of the carbon content and plate thickness of the strip-shaped mild steel plate 5, and regardless of the outer diameter dimension of the slit roll 2.

The present invention has been made based on the above-mentioned basic matters, and will be described below with reference to examples.

First, a T-shaped cross-section of a long material processed by the method of this embodiment will be described.

FIG. 4 is a perspective view showing a T-shaped cross section processed by the method for processing an elongated member according to an embodiment of the present invention. In FIG. 4, a T-shaped cross-section 1 has a slit 7 extending from one longitudinal edge of a belt-shaped mild steel plate to the opposite longitudinal edge to divide the plate thickness t into two. The flange portion 1h is continuously bent by being stretched out, and the guide portion blind α remains the material that allows processing.

Next, the outline of the processing device used to carry out this processing will be explained using Fig. 1.5.6.

FIGS. 5 and 6 are schematic diagrams showing the first and final slit expansion stands used for processing the T-shaped cross-sectional shape shown in FIG. 4, respectively.

This processing device includes an uncoiler that coils a belt-shaped mild steel plate 5 of a predetermined size, and a direction ρ) from one longitudinal edge of the belt-shaped mild steel plate 5 supplied from the uncoiler to the opposite longitudinal edge. A slit processing machine (details will be described later) that can continuously make slits 7 that divide the plate thickness t into two parts is used, and the crack portion 1b is formed by expanding the slit section processed by this slit processing machine to both sides. It has a slit expansion machine (details will be described later) that can continuously bend and form the T-shaped cross-sectional shape 1 shown in FIG.

The slit processing machine is the s 11 shown in FIG.

A plurality of estands (where the angle 2θ of the tip of the slit roll 2 is 60″) are arranged in the feeding direction of the strip-shaped mild steel plate 5 (in the direction perpendicular to the plane of the paper in FIG. 1), that is, in multiple stages. In order to form slits 7 with a desired slit depth, the distance between the slit roll 2 and the bottom holding roll 5α is adjusted to gradually become narrower. The ratio Δd/l) between the pushing amount nodule d and the outer diameter of the sleeve o-le 2 is adjusted to 4/220 for each stage.

In addition, the slit spreading machine has a slit spreading stand shown in FIG. 5 at the first stage (details will be described later), a middle stage K, and a slit spreading stand in which the distance between the flat roll and the bottom surface holding roll is gradually narrowed. A slit spreading stand (details will be described later) shown in Fig. K6 is disposed at the final stage.

The first stage slit spreading stand is disposed on the slit forming side (one longitudinal edge 5α side) of the belt-shaped mild steel plate 5,
Flat roll 6h that can widen the slit part
, a bottom surface holding roll 5b that holds the opposing longitudinal edges 511, and a side surface holding roll 4h that holds the side surface of the strip-shaped mild steel plate 5.

The final stage slit spreading stand is a belt-shaped mild steel plate 3.
It has a flat roll 6c which is disposed on the slit forming side and can form the crack portion 1b with the side holding roll 4C, and a bottom holding roll 5c which holds the opposing longitudinal edge 56.

A method for processing a long profile according to an embodiment of the present invention will be described using the processing apparatus configured as described above.

A strip-shaped mild steel plate 5 wound into a coil is sent out from the hole and supplied to the first stage slitting stand of the slitting machine (FIG. 1). Here, the tip of the slit roll 2 is pushed from one longitudinal edge 5α of the strip-shaped mild steel plate 5 toward the opposing longitudinal edge 5b, and the strip-shaped mild steel plate S moves in a direction perpendicular to the plane of the paper, increasing the plate thickness t. Split into two parts 1
The parts are processed continuously. In this process, the angle 2θ of the tip of the slit roll 2 is 60°, Δd/D: 4/
Since this is carried out under the conditions of 220 degrees, as is clear from FIG. 3, no cracks occur in the strip-shaped mild steel plate 5. The slit depth is gradually increased by the slit processing stands from the next stage to the final stage, and processing is performed under the same conditions as in the first stage slitting stand, so that the slits can be made to the desired slit depth without cracking. 7
are formed continuously.

The strip-shaped mild steel plate 5 with the slit portion formed in this manner is supplied to the slit expansion stand at the first stage of the slit expansion machine (FIG. 5).

Here, the slit portion is pushed out to both sides by the flat roll 6b, and further pushed out by a slit spreading stand located halfway. Then, it is supplied to the final stage slit spreading stand (Fig. 6), where it is fed to the flat roll 6C.
The crack portion 1b is formed by the side holding roll 4C, and the T-shaped cross-sectional shape 1 shown in FIG. Therefore, there is no need for an expensive heating furnace, and there is no oxidation or thermal deformation of the surface due to heating. Moreover, since cracks do not occur during slit processing with the slit roll 2, the T-shaped cross section 1 has excellent surface shape 9 and dimensional accuracy.
It has the advantage that it can be easily molded at low cost.

Although this embodiment has described the method for processing the T-shaped cross-section 1, the present invention is not limited to the processing of the T-shaped cross-section 1; By making slits also from the opposing longitudinal edges 5b, a single-shaped cross-section can be processed.

Furthermore, the slitting machine used in the processing of this embodiment is one in which a plurality of slitting stands are arranged in which the distance between the slitting roll 2 and the bottom surface holding roll 5α is gradually narrowed. When the number of shapes to be produced is small, only one slitting stand is used, and the interval between the slit roll 2 and the bottom holding roll 5α is successively narrowed during one bath, and the belt-shaped mild steel plate 5 is reciprocated. The slit machining stand may apply pressure while the slit machining process is repeated until the desired slit depth is achieved.

[Effects of the Invention] As explained in detail above, according to the present invention, the surface shape 1
It is possible to provide a method for processing an elongated material, which can inexpensively and easily process an elongated material with good dimensional accuracy.

[Brief explanation of drawings]

FIG. 1 is a schematic cross-sectional view showing an example of a slitting stand used for carrying out the method of processing a long shape according to the present invention;
FIG. 2 is a sectional view showing an example of a belt-shaped mild steel plate processed by the slitting stand according to FIG. 1, and FIG.
The tip angle 2θ of the slit roll in Fig. 1 and the second
Figure 4 is a 2θ- line diagram showing the relationship between the crack depth t and Figure 4 shows a T-shaped cross-sectional shape processed by the method for processing a long profile according to an embodiment of the present invention. The perspective view shown in FIGS. 5 and 6 are schematic diagrams respectively showing the first stage and final stage slit expansion stands used for processing the T-shaped cross-sectional shape according to FIG. 4. 1...T-shaped cross section, 1b...crack part, 2...
...Slit roll, 5...Band-shaped mild steel plate, 5α...
One longitudinal edge, 5b... Opposing longitudinal edge, 7...
・Slit, D...outer diameter of slit roll, Δd...
・Pushing amount per bus, t...plate thickness, 2θ...tip angle. 5 Ward 2 Noa) Box 0 30 1,. 0 90
乃-#Jaty PJ l zθ(・)PJ
sy 3b feeling 目□ 工ζ C t '6 C

Claims (1)

[Claims] 1. The slit section is created using a disc-shaped slit roll with a wedge-shaped tip that can continuously make slits that bisect the plate thickness from one longitudinal edge of a belt-shaped mild steel plate to the opposite longitudinal edge. In this method, the angle 2θ of the tip is 55° to 6.
A 5° slit roll is used, and the ratio Δd/D of the pushing amount Δd per bath to the outer diameter D of the slit roll is approximately 4/200 or less, or the tip angle 2θ is 40° to 5.
Using slit rolls of 5°, 65° to 90°, the ratio Δ
A method for processing a long shape material, characterized in that slit processing is repeated until a slit portion of a desired depth is obtained, with d/D being approximately 3/220 or less.