JPH02187266A - Manufacturing method of anti-slip pipe - Google Patents

Abstract

PURPOSE:To keep a projecting part protruding by a suitable dimension from the surface of a pipe by bending a hoop material of specific plate thickness or specific ruggedness in the shape of the pipe, securing a specific rugged pattern and performing TIG welding of both terminal joints of the hoop material. CONSTITUTION:The hoop material 1 of stainless steel hoop having rugged patterns 3, 2 on the surface is bent in the shape of a pipe to weld both its terminal joints 6, 7. In this case, in the hoop material, the thickness is given by 0.8-4.0mm, the height of the projecting part 2 is by 100-200mum and the protrusion of the recessed part 3 is by 10mum. This hoop material 1 is bent by a roll forming machine in the shape of a pipe 4 to secure rugged patterns 3, 2 having heights exceeding 50mum on the surface. Both terminal joints 6, 7 are put under TIG welding. The sections of the pipe is circular, elliptical, square, polygonal or of other arbitrary shapes. By this method, the unevenness of a welded beam which and lack of penetration can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a method for manufacturing a soaking prevention pipe whose surface is shaped with a concave-convex pattern, and is particularly applicable to handrails, fences, jungle gyms, etc. The present invention relates to a method of manufacturing a non-slip pipe that is formed using stainless steel strips for pipe products that are required to be non-slip and have good design as materials for ladders and the like.

[Conventional technology]

For stainless steel pipe products such as handrails, fences, and various other types of efsteria, jungle gyms, and ladders, if the surface of the pipe has irregularities, for example, when the pipe is grabbed by hand, Your hands won't get wet from the pipe (and your grip will be more secure).Also, from a design perspective, it is better to have an uneven pattern on the surface of the pipe than one with no pattern. Needless to say, it is excellent and desirable.

When manufacturing a stainless steel pipe having a surface with a rough pattern like this, there are generally two methods.

The first method is to form a pipe by bending an unpatterned stainless steel band plate (hereinafter referred to as hoop material), which is a pipe material, into a tubular shape, and then etching the surface of the pipe after forming the pipe.

The second method is to use a hoop material whose outer surface has been previously formed with an uneven pattern using rolling rolls as a pipe material, and to form a pipe by bending this hoop material into a tubular shape.

The first method has the drawback that the manufacturing cost is much higher than the second method, and it is not practical. Therefore, if a pipe with an uneven pattern is to be manufactured, the second method is practical.

Now, a manufacturing method for manufacturing a pipe with an uneven pattern using the second method will be described with reference to FIGS. 1 to 5.

FIG. 1 is a front view of a hoop material 1 made of a stainless steel band plate with a pattern of convex portions 2 and concave portions 3 formed on the surface of which the pipe is to be made. Using a roll forming machine (not shown), this hoop material L is bent into a tubular shape so that the uneven pattern becomes the surface, and the pipes 4 and 5 shown in FIGS. 2A and 3B and 3A and 3B are
The end surfaces 6 and 7 on both sides are brought together and the TI
This is a G-weld welding joint. In addition, in the figure, 8 is a welding torch, and 9 is a welding part.

The pipe 5 shown in FIG. 3 is a square vibe made by bending the hoop material 1 into a square tube shape.

[Problem that the invention seeks to solve]

Second method, commercially available hoop material 1 with uneven pattern
When manufacturing the pipe 4 shown in FIG. 2 and the pipe 5 shown in FIG. 3 using this method, there are the following problems.

That is, although there is a clear uneven pattern on the surface of the hoop material 1, the clear uneven pattern is erased by the various oiling rolls and sizing rolls of the roll forming machine during the process of bending and forming it into a pipe. There is.

This will be explained with reference to Figures 4 and 5. Figure 4 is an enlarged explanatory diagram showing the relationship between the heights of the convex part 2 and the concave part 3 of the hoop material (that is, the material before being formed into a pipe) l. FIG. 5 is a diagram showing the relationship between the heights of the convex portions 2 and the four portions 3 formed by bending the hoop material 1 into a pipe using a roll forming machine.

And hl.

hs is the height dimension of the convex portion 2 in the hoop material 1 and the pipe 4.5, h2. h4 indicates the height of the concave portion 3 between the hoop material 1 and the pipe 4°5.

By the way, as a result of investigating the height dimension of the uneven part of the hoop material 1 of a commercially available stainless steel band plate having an uneven pattern on the surface, the inventor found that the above-mentioned hoop material with a thickness of about 1.40 mm passed as a pipe material. hs (height dimension of the convex part) is 50μ
m and h2 (swelling dimensions of the recess) are 10 μm,
The height difference between the uneven portions was approximately 40 μm.

Therefore, the height dimension of the uneven portion was further investigated when the hoop material 1 was bent into a tubular shape using a roll forming machine to form a pipe with an outer diameter of φ22. As a result, as shown in Table 1, h
s (the height dimension of the convex part) is crushed by the roll of the molding machine and becomes as low as 25 μm, while h4 (the raised dimension of the concave part) becomes 25 μm, and the height difference of the convex and concave parts is 0.
It became.

In other words, it has been confirmed that when a pipe is bent and formed using a conventional commercially available hoop material 1 of stainless steel strip having an uneven pattern on its outer surface, there is a problem in that the uneven pattern disappears.

As a means to solve this problem, it is conceivable to significantly increase the height dimension h1 of the convex portion 2 of the hoop material 1, but if the height dimension is not appropriate, difficulties will arise in rolling forming. . In addition, when producing the welded pipes 4 and 5 shown in FIGS. 2 and 3, problems arise in the welded portions.

To explain this with reference to FIGS. 2, 3, 6, and 7, if the height difference between the convex part 2 and the concave part 3 of the hoop material 1 is large, the thickness of the plate directly under the welding torch 8 will be reduced during arc welding. 11
For this reason, if welding is performed in an attempt to forcibly bring out the back bead, the life of the electrode at the tip of the welding torch 8 will be extremely shortened, and the weld width will be significantly wide, resulting in a poor aesthetic appearance.

On the other hand, if welding is done weakly, welding @ 12 will continue like a wave in a wide part and a narrow part on the outside of the welded part 9, corresponding to the convex part 2 and the concave part 3, as shown in FIG. 7, a back bead cut portion 13 occurs in the narrow portion, and there is a problem in that smooth welding cannot be performed in any case.

As described above, according to the conventional method, it is difficult to manufacture an anti-slip pipe having irregularities with appropriate height differences on the outer surface.

[Means for solving problems]

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a method of manufacturing an anti-slip pipe that solves the above-mentioned problems.

To achieve the above object, the present invention provides a method for manufacturing an anti-slip pipe by bending a hoop material of a stainless steel band plate having an uneven pattern on the surface into a tubular shape and welding the joints at both ends. A hoop material having a thickness of 0.0 mm, a height of the convex portion of 100 μm to 200 μm, and a raised size of the concave portion of approximately 10 μm is bent into a tubular shape using a roll forming machine, and the surface is coated with 50 μm. The feature is that the concavo-convex pattern of um or more is ensured, and the both ends of the hoop material are welded using a TIG welding machine, and the cross section perpendicular to the axis of the pipe can be any shape such as circular, elliptical, square, polygonal, etc. It is characterized by having a cross-sectional shape of .

To explain this more specifically, the present inventor has formed an uneven pattern on the surface, and the thickness of the plate is 0.8 mm to 4.8 mm.
For each hoop material 1 in the range of 4.0 mm,
The height dimension h1 of the convex part 2 and the height dimension h2 of the concave part 3 are varied, and this is bent into a tubular shape using a roll forming machine to produce pipes with various outer diameters of φ15 m1 to φ200 m. The relationship between the height dimensions of the uneven portion when

As a result, the height dimension h1 of the convex portion 2 of the uneven pattern is 200 μm.
When a pipe was manufactured using a hoop material l with a diameter of 250 μm or more, various oil rolls of a roll forming machine,
Due to the pressure contact between the sizing roll and the recess 2, the pipe could not always be bent smoothly.

Furthermore, butt the both end surfaces of the folded hoop material together,
When welding, the plate thickness variation directly under the welding torch is too large, resulting in uneven weld beads and insufficient penetration as shown in Figures 6 and 7, making stable welding impossible and significantly reducing yield. It turned out to be depressed.

From this, the convex portion 3 of the hoop material l shaped with a concavo-convex pattern
It has been found that 200 μm is appropriate for the upper limit of the height dimension h1.

Next, in order to find the lower limit of the height h1 of the convex part 3, the convex parts 3 whose height h1 was gradually reduced were bent into pipe shapes.

As a result, when the height dimension h1 of the convex portion 3 becomes 100 μm or less, when the pipe is bent by a roll forming machine,
This convex portion 3 is crushed to a height of 50 μm to 60 μm,
The difference in height from the concave portion 3 was very small, the convex portions 2 on the surfaces of the pipes 4 and 5 were no longer clear, and the convex portions 2 could hardly be felt by the hand when the pipes were gripped. From this, it was found that the lower limit of the height dimension h1 of the convex portion 2 of the hoop material 1 formed with the uneven pattern is 100 μm.

In addition, the commercially available hoop material having an uneven pattern and the height dimension of the convex portion 2 according to the present invention are 150. Convex portion 2 when a pipe with an outer diameter of 22 m is formed by bending the hoop material 1 of czm
The changes in height and height of the recess 3 are shown in Table 1 below.

Table 1 As can be seen from Table 1, using the hoop material according to the present invention with a plate thickness of 1.40 mm and a height dimension (hl) of the convex portion 2 of 150 μm, it was When the pipe was bent, the difference in height between the recesses 2 and the protrusions 3 was 70 μm, and it was clearly confirmed that the protrusions 3 were biting into the palm of the hand when formed into a pipe.

〔Example〕

Next, an example of the use of the anti-slip pipe manufactured by the method of the present invention will be explained with reference to FIGS. 8 to 11.

Figure 8 shows the handrail 12 of the movable staircase for the pool for the disabled.
．． 13 shows an example in which the stainless steel anti-dip vibrator according to the present invention is used.

Figure 9 shows an example of a fall prevention fence such as Mansimin, and its pillars 14. An example is shown in which the stainless steel anti-slip vibrator according to the present invention is used on the upper crosspiece 15, the lower crosspiece 16, etc.

FIG. 10 shows an example of a handrail 18 of a toilet 17 exclusively for the disabled, in which the stainless steel anti-slip vibrator according to the present invention is used.

FIG. 11 shows an example of a manhole step, and the step par 20. An example in which the anti-slip vibe according to the present invention is used in the gripper 21 is shown.

Although not shown, it goes without saying that the anti-slip vibrator of the present invention may be used in various products using pipes.

(Effects of the Invention) According to the method for manufacturing an anti-slip vibrator according to the present invention, a stainless steel hoop material having an uneven pattern on its outer surface is bent into a tubular shape using a roll forming machine. By forming the upper limit of the height of the convex part of the material to 200 μm and the lower limit to 100 μm, the convex pattern will not be crushed when the hoop material is bent and formed into a pipe, and the convex part of an appropriate size will be formed on the vibrator surface. can be maintained in a protruding state.

Moreover, when welding the opposite end faces of a hoop material bent into a tubular shape against each other, the upper and lower limits of the height of the convex part are set as described above, so even if there is a difference in height between the concave and convex parts. Regardless, it has the excellent effect of being able to perform smooth welding without causing irregularities in weld bead width or insufficient penetration.

[Brief explanation of the drawing]

Fig. 1 is a front view of a stainless steel band hoop material with an uneven pattern on its surface, Fig. 2 A and B are a side view and a sectional view of a pipe formed into a circular tube shape using the hoop material, Figures 3A and 3B are a front view and a sectional view of a pipe formed into a rectangular shape using the hoop material, and Figures 4 and 5 show the height dimensions of the uneven portions of the hoop material and the pipe. Explanatory diagram,
Fig. 6 is an explanatory diagram showing a state where the bead width on the pipe surface side is uneven due to the unevenness of the pipe, Fig. 7 is an explanatory diagram showing a state where the weld penetration is insufficient on the pipe inner face side, and Figs. 8 to 11 The figures show an example of the use of the anti-soaking vibrator manufactured by the method of the present invention, Fig. 8 is an explanatory diagram of a handrail of a movable staircase in a swimming pool for the handicapped, Fig. 9 is an explanatory diagram of a fence, and Fig. 10 is an explanatory diagram of a handrail for a handicapped pool. FIG. 11 is an explanatory diagram of the handrail of the toilet, and FIG. 11 is an explanatory diagram of the manhole step. 1... Hoop material 2... Convex portion 3... Concave portion 4.
5...pipe

Claims (2)

[Claims] (1) A method for manufacturing an anti-slip pipe made by bending a hoop material of a stainless steel band plate having an uneven pattern on its surface into a tubular shape and welding the joints at both ends.
The plate thickness is 100 μm to 20 μm and the height of the convex portion is 100 μm to 20 μm.
A hoop material with a diameter of 0 μm and a raised concave portion of approximately 10 μm is bent into a tube shape using a roll forming machine, and a 50 μm layer is formed on the surface.
A method for manufacturing an anti-slip pipe, which is characterized in that an uneven pattern of m or more is ensured, and the joints at both ends of a hoop material are welded using a TIG welder. (2) The method for manufacturing an anti-slip pipe according to claim 1, wherein the cross section perpendicular to the axis of the pipe has an arbitrary cross-sectional shape such as a circle, an ellipse, a quadrangle, or a polygon.