JPH0994747A - Column bead grinding device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a retainer used in a column bead grinding device which can grind a column bead easily and completely without switching the top and bottom of the column. SOLUTION: This retainer 1 is formed by joining two horizontal (h) type side plates 11, 11 with three joining plates 13, and at the top surface of horizontal joining plate 13, a fixing device 15 is screwed. Inside the lower end part of the side plate 11, two guide grooves 16 are formed out of two steel plates, and at its internal part, a setting groove 17 for attaching to a column 3 is formed. The plate hardware 24, 24 of a grinding element 2 slide on the guide grooves 16, 16. At this time, cutters 23, 23 on the top of a cutter mount 22 grind off the bead 33 at the lower surface 31 of the upper side part of the column 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for scraping off unnecessary swelling (hereinafter referred to as a bead) of a welded portion of a column which is a pillar material for construction.

[0002]

2. Description of the Related Art In recent years, columns are often used as structural materials, particularly column materials, as a framework of steel frame construction. The column is formed by winding a steel plate in a cylindrical shape, automatically welding the joints, and then forming a square tube shape. In some cases, the steel plate is pressed and bent, and the joints are welded to form a square tube. In any case, welding causes metal swelling at the seam. The bead can be on the outer peripheral surface or the inner peripheral surface, but the bead on the outer peripheral surface (front bead)
Are often scraped off at the time of shipment. The bead described below refers to the back bead formed on the inner peripheral surface unless otherwise specified.

When this column is used for steel frame construction, the column is first cut into the floor height dimension and the beam dimension, and then both ends thereof are beveled (beveling processing) in order to surely weld the object to be welded. To do. As shown in FIG. 5, an iron ring-shaped backing metal 5 matching the shape of the inner peripheral surface was fitted inside the both ends of the column 4 thus processed, and the lower end portion 4a of the column 4 was attached to the base steel plate 6. , Gas shield arc welding. Then, as shown in FIG. 6, the beam 7 made of H-shaped steel is used.
A steel plate 8 for supporting the above is welded to the upper end portion 4b of the column 4 by gas shield arc welding. This will be a pillar equivalent to one floor. Since the strength of the welded part is the most important issue in steel-framed construction, at present, after the welding work is completed, it is inspected by ultrasonic flaw detection (UT inspection) to see if there is any abnormality in the welding. I'm confirming.

The backing plate 5 prevents the gas (often used carbon dioxide gas) for shielding the weld from the surrounding air from diffusing at the time of welding, and at the same time, prevents the metal melted by welding from flowing into the column. This is to prevent it from blowing out or falling. In addition,
FIG. 6 is a cross-sectional view including a joint 4c which is a welded portion of the column 4. In the figure, the right vertical cross-section portion corresponds to the joint 4c of the column 4.

[0005]

However, as described above, since there is a bead on the inner peripheral surface of the welded portion of the column, it becomes an obstacle and the backing plate cannot be fitted.
Therefore, it was necessary to scrape off the bead before the welding work for installing the column. However, the welded part of the column is often on the upper side due to the column manufacturing process and transportation work, and the bead facing down is difficult to scrape off, so
First, the top and bottom of a very heavy column were replaced with great effort, and then the scraping work was performed. The bead on the lower side is easier to shave than the bead on the upper side, but while visually checking the shaving condition, holding the heavy disk sander by hand and shaving the bead of the column little by little is a difficult task Met.

The present invention has been proposed in view of the above problems, and it is not necessary to replace the upper and lower columns.
An object of the present invention is to provide a column bead grinding device capable of easily and accurately grinding a bead of a column with a grinding tool.

[0007]

In order to solve the above-mentioned problems, in a column bead grinding apparatus of the present invention, an engaging portion that engages with one end of a welding surface having a butt welding portion of a column, and the above-mentioned welding. A grinding tool for scraping off the bead of the portion, and a guide portion which is formed integrally with the engagement portion and moves the grinding tool along the welding portion are provided.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION The best mode for carrying out the present invention will be described below in detail with reference to the drawings. 1 is an exploded perspective view of a column bead grinding apparatus according to the present invention, FIG. 2 is a perspective view of a mounted state of the column bead grinding apparatus of FIG. 1, and FIG. 3 is a sectional view taken along line AA of FIG. In FIG. 1, 1 is a holding tool, 2 is a grinding tool, and 3 is a column.

The holder 1 comprises two lateral h-shaped side plates 11.1.
1 is connected by three connecting plates 12, 13 and 14, and a fixture 15 is screwed to the upper surface of the horizontal connecting plate 12. A guide groove 16 is formed of two steel plates inside the lower end of the side plate 11, and a set groove 17 for mounting on the column 3 is formed in the middle portion.

In the grinding tool 2, a disc-shaped tool mount 22 is attached to the tip of a cylindrical main body 21, and this tool mount 2
Two grinding blades 23, 23 are provided on the upper surface of 2. The rotary shaft of the blade mount 22 is provided at right angles to the central axis of the main body 21. Further, on both sides of the main body 21, there are L-shaped plate metal fittings 24, 24 that slide in the guide grooves 16, 16.
Are attached parallel to the central axis of the main body 21.

The column 3 is formed by carbon dioxide welding the seam 32 located at the center of the upper side 31.
A bead 33 is provided on the lower surface of the seam 32. Here, the fixture 15 and the set groove 17 correspond to the engaging portion, the guide groove 16 corresponds to the guide portion, the upper side portion 31 corresponds to the welding surface, and the joint 32 corresponds to the welding portion.

Next, the holder 1 is attached to the column 3, then the grinder 2 is set on the holder 1, and the inner bead 33 is set.
The operation of scraping off will be described in order. First, as shown in FIG. 1, the upper side portion 31 of the column 3 is inserted so as to be sandwiched between the set grooves 17 and 17 and pushed to the innermost portion of the set grooves 17 and 17. At this time, the bead 33 on the upper surface 31a is fixed to the fixture 15.
The holder 1 is attached so as to be slightly displaced from the central portion of the upper side portion 31 so as not to hit the holding metal fitting 15d.
In addition, when the tip of the fixture 15 is raised, the holder 1
The upper surface 17a of the setting groove and the upper surface 31a of the upper side portion are in contact with each other.

Next, when the lever 15a shown in FIG. 1 is pushed in the direction of the column 3, the intermediate portion of the arm 15b is pushed and the tip end is lowered. At this time, the bolt 15c attached at a right angle to the tip of the arm 15b is attached to the pressing member 15 as shown in FIG.
The upper surface 31a of the upper side is pressed through d. Then, the entire holder 1 is lifted up with respect to the column 3, and the lower surface 31b of the column 3 and the set groove lower surface 17b come into contact with each other. And finally, the arm 15b of the fixture 15 is horizontally fixed.

When the holder 1 is attached to the column 3 in this way, as shown in FIG.
24 is fitted in the guide grooves 16, 16 of the holder 1, a switch (not shown) is inserted, and the blade mount 22 is rotated. Subsequently, when the grinding tool 2 is moved to the back, the bead 33 on the lower surface 31b of the upper side portion moves the grinding tool 23 as shown in FIG.
・ It will be scraped off by 23. Here, the set groove lower surface 17b and the guide groove 16 are parallel to each other, and the grinding blade 2
The length between the cutting edge of No. 3 and the lower surface of the horizontal portion of the plate fitting 24 is the length h.
Since it is formed to be equal to (the lower surface of the set groove 17b-the lower surface of the guide groove), even when the grinding tool 2 is slid, the grinding blade 23 scrapes only the bead 33 without scraping the lower surface 31b of the upper side portion. In this way, the bead 33 rising on the inner peripheral surface near both ends of the column 3 is scraped off by 3 to 4 cm from the end surface.

Here, the bolt 15c is attached so that the upper portion of the bolt 15c sandwiches the arm 15b from above and below with two nuts 15e, 15e, and the length below the attachment position can be freely adjusted. . for that reason,
It can be attached to columns with different plate thickness. That is, the bolt 15c is pulled up when the plate thickness is thick, and the bolt 15c is lowered when the plate thickness is thin.

In the above embodiment, the guide groove is formed by two steel plates, but since the weight of the grinding tool 2 is low,
You may make it only the lower steel plate which receives it. Further, the inner surface of the side plate 11 may be shaved to directly form the guide groove.

FIG. 4 shows an example of a column bead grinding machine to which another fixing tool is attached. The fixing tool 18 is of a bolt type and can be quickly attached to steel plates having different plate thicknesses depending on the screwing amount. Further, when the plate thickness of the column to be ground is constant, if the width of the set groove is formed to match the plate thickness, the fixture is not necessary.

The column bead grinding apparatus according to the present invention is also used for bead grinding of round steel pipes by reducing the diameter of the tool mount 22 of the grinding tool according to the size of the inner diameter, or by making it into an umbrella shape. be able to.

[0019]

According to the column bead grinding apparatus of the present invention, when the welding tool is fixed to one end portion of the welding surface of the column with the engaging portion, the grinding tool moves along the welding portion by the guide portion.
The grinding tool can easily and accurately scrape only the bead of the weld.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of a column bead grinding device according to the present invention.

FIG. 2 is a perspective view of a mounted state of the column bead grinding device of FIG.

FIG. 3 is a sectional view taken along line AA of FIG. 2;

FIG. 4 is a perspective view of a column bead grinding device to which another fixture is attached.

FIG. 5 is an explanatory diagram of a steel frame building using columns.

FIG. 6 is an enlarged sectional view of a main part of FIG. 5;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Holding tool 15, 18 Fixing tool (engaging part) 16 Guide groove (guide part) 17 Set groove (engaging part) 2 Grinding tool 3 Column 31 Upper side part (welding surface) 32 Seam (welding part) 33 Bead

Claims (1)

[Claims] Claim: What is claimed is: 1. An engagement part for engaging one end of a welding surface of a butt-welded part of a column, a grinding tool for scraping off the bead of the welding part, and a welding tool formed integrally with the engagement part. Column bead grinding device comprising: a guide part that moves along the part.