JP2006198710A - Polishing method for welded material and polishing device therefor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a polishing method and a polishing device which polish grinding marks after grinding a welding bead with an existing grinding device, and make the welded portion into the state having no difference from the surface quality of the surface of non-welded portion. <P>SOLUTION: When removing the grinding marks 1A by polishing with a polishing tool 4A (4B), in which a rotating polishing disc is provided at a tip end part, while transferring the welded material 1, of which strip-shaped grinding marks 1A remain and extend to the surface in the grinding direction, in one direction, two or more polishing tools 4A (4B) are disposed in a zigzag manner alternately in the transferring direction of the welding material 1 so as to cover the strip width part of the grinding marks 1A with the whole of the polishing tool. In the polishing method and device for the welded material, the polishing disc 5 is press-contacted to the grinding marks 1A while rotating it in the direction orthogonal to the extending direction of the grinding marks 1A. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a welding material polishing method and a polishing apparatus used therefor, and more specifically, a grinding mark remaining when grinding a weld bead in a welded portion when a steel material is butt welded is reliably polished and removed, and a welded portion The present invention relates to a method for polishing a welded portion capable of improving the surface quality of the metal and a polishing apparatus used therefor.

For example, there are two types of channel steel (channel): a rolled channel manufactured by hot rolling and a weld channel manufactured by welding angle steel (angle).
Among these, the welding channel is usually manufactured by arranging two angles in the longitudinal direction and continuously butting each other's flange portion. In this process, weld beads extending in the longitudinal direction of the channel are formed as linear protrusions on the upper and lower surfaces of the welded portion.

This weld bead is removed by grinding because it causes inconveniences such as lowering the fatigue strength of the channel and worsening the sitting when the channels are stacked.
This grinding operation has been usually performed manually using a hand grinder or the like and using abrasive grains having a desired particle size. However, such a grinding operation has problems that productivity is low and a finished surface is likely to be uneven.

For these reasons, various types of automatic welding bead grinding apparatuses have been developed and are actually used at the manufacturing site of welding channels.
By the way, when the weld bead is ground by such a grinding apparatus, as shown in FIG. 5, the projection of the weld bead is ground and removed, but the welded portion has a strip shape different from the surface state of the non-welded portion 1B. 1A remains in the longitudinal direction of the channel.

Therefore, the quality of the skin surface in the obtained welded channel is remarkably inferior to that of the rolled channel, and the commercial value is reduced.
For this reason, the channel processed by the grinding apparatus is manually polished again to polish the grinding marks and improve the surface quality of the welded part to the surface quality of the non-welded part. Yes.

When the grinding apparatus is used, the productivity in the grinding process of the weld bead is increased. However, in the grinding process, band-shaped grinding marks are generated and the surface quality of the welded material is deteriorated. Therefore, it is necessary to introduce a manual polishing process with low productivity following the grinding process. appear.
The present invention solves the above-mentioned problems in the polishing process, and on the premise that the grinding process is performed by an existing grinding apparatus, and a polishing method for welding material that improves productivity by mechanizing the subsequent polishing process, and An object of the present invention is to provide a polishing apparatus used therefor.

In order to achieve the above object, in the present invention,
A polishing tool in which a polishing disk is provided at the tip of a grinding disk that rotates while grinding the weld bead while the belt-shaped grinding trace extends to the surface in the grinding direction and conveys the remaining welding material in one direction. When polishing and removing with, the two or more of the polishing tools are alternately zigzag arranged in the conveying direction of the welding material so as to cover the band width portion of the grinding mark in the entire polishing tool, and the polishing A welding material polishing method is provided, wherein the disk is pressed against the grinding trace while rotating the disk in a direction orthogonal to the extending direction of the grinding trace.

In the present invention,
A polishing apparatus that polishes and removes the grinding traces of the welding material in which the grinding traces of the weld beads extend in a band shape on the surface of the welded portion and remain,
The apparatus entrance is provided with a transport roller for transporting the welding material,
Two or more polishing discs provided at the tip of the conveyance path located downstream of the conveyance roller, which are in pressure contact with the grinding trace and rotate in a direction orthogonal to the extending direction of the grinding trace in the plane. The welding tool polishing apparatus is characterized in that the polishing tool is disposed in a zigzag manner in the conveying direction of the welding material so as to cover the band width portion of the grinding mark with the entire polishing tool.

  Grinding marks of the welded portion are rougher than the rolled surface, and minute uneven patterns tend to be arranged in the grinding direction. And in this invention, since the polishing disk is rotated so that it grinds from a right angle direction with respect to this concavo-convex pattern which tends to be arranged in the grinding direction (conveying direction of the welding material), the concavo-convex pattern is effective. The surface quality is close to the state of the rolled surface of the non-welded part. Therefore, after polishing, the difference in surface quality between the welded portion and the non-welded portion becomes small.

The polishing disc is disposed so as to cover the entire belt-shaped grinding trace and performs the above-described polishing operation. Therefore, after the polishing is completed, the entire polishing trace is erased.
Moreover, since the apparatus of the present invention automatically performs the polishing operation, it is possible to improve the surface quality of the welded material under high productivity compared with the polishing by manual operation.

The welding material to be polished in the present invention is a welding material in which a weld bead is ground by an existing grinding apparatus after butt welding.
On the surface of the welding material 1, for example, as shown in FIG. 5, a grinding mark 1 </ b> A having a certain width around the welding line extends in the longitudinal direction (welding direction), and other than the grinding mark 1 </ b> A. The surface 1B of the non-welded part is, for example, a rolled surface.

The welding material 1 in which the weld bead has been ground by a grinding apparatus (not shown) is subsequently introduced into the polishing apparatus A of the present invention shown schematically in FIG.
The welding material 1 is introduced into the apparatus by a conveying roller 2 provided at the inlet of the apparatus and driven by, for example, a roller chain, is conveyed through the apparatus, and is led out from the apparatus via a rotating roller 3 provided at the outlet. However, continuous polishing is performed on the grinding mark 1A in this process.

In this apparatus A, in the conveying path of the welding material 1 located between the conveying roller 2 and the rotating roller 3, four polishing tools 4A are arranged in the upper part and four polishing tools 4B are arranged in the lower part, By conveying the welding material 1 between the upper polishing tool and the lower polishing tool, grinding marks on the upper surface and the lower surface of the welding material can be simultaneously polished.
As shown in FIG. 2, the polishing tool is provided with a polishing disk 5 that is rotated by, for example, an air motor at the tip. Polishing is advanced by press-contacting the grinding disc 1A of the welding material 1 that has been transported with the polishing disk of these polishing tools.

In that case, the polishing tool is arranged in the following manner with respect to the welding mark 1A of the abrasive 1.
First, as shown in FIG. 3, the four upper polishing tools 4 </ b> A and the four lower polishing tools 4 </ b> B are alternately arranged in a zigzag manner in the conveying direction of the welding material 1. By such a zigzag arrangement, excessive polishing of the grinding mark 1A can be prevented.
Further, in the upper and lower polishing tools arranged in a zigzag manner in the conveying direction of the welding material, the polishing disks 5 of these polishing tools are arranged so as to cover the entire width of the grinding mark 1A. By disposing in this way, the entire grinding mark can be polished reliably and uniformly.

Further, the polishing disk 5 of these polishing tools is rotated in a direction (a direction perpendicular to the grinding mark) in which the grinding mark 1A extending in the transport direction is polished in the width direction in the surface. By polishing with such rotation, the unevenness of the grinding trace can be reliably polished and removed.
In that case, it is preferable that all the polishing disks 5 of the arranged polishing tools are rotated in the same direction as shown by arrows in FIG. This is because generation of fine scratches on the polished surface can be reliably suppressed.

Note that these polishing tools are all connected to the drive control device 6, and according to commands from the control device 6, the respective pressure contact forces and the inclination angles with respect to the respective welding materials can be appropriately set. .
For example, as shown in FIG. 4, soft sand paper is used as the polishing disk 5, and the polishing disk 5 is used as a grinding mark in a state where the rotation axis of the polishing tool is inclined at an angle with respect to the welding material 1 according to a command from the control device 6. When pressed, the polishing disc bends and its polishing surface becomes wider, so that the polishing efficiency of grinding marks can be increased.

In polishing the grinding mark 1A with this apparatus A, first, the roughness state of the unevenness in the grinding mark 1A is grasped in advance, and the conveying speed (polishing speed) of the welding material 1 by the conveying roller 2 is determined accordingly. The rotational speed, the pressure contact force of the polishing tool 4A (4B), the inclination of the rotating shaft, and the like are set to appropriate values according to commands from the control device 6.
And what is necessary is just to introduce | transduce into the apparatus A the welding material 1 derived | led-out from the existing grinding apparatus located in the front | former stage. Grinding marks existing on the upper and lower surfaces of the welding material 1 are automatically polished, and the double-side polished welding material is continuously led out from the apparatus A.

In this way, a welding material is obtained in which the difference between the polished surface and the surface of the non-welded part (rolled surface) is hardly observed.
And after this grinding | polishing, if the surface of a welding material is further subjected to sandblasting or pickling treatment, the surface quality is further improved, which is preferable.
1 has a structure in which the polishing tool is disposed on the upper surface and the lower surface of the welding material. For example, when grinding marks of the welding material remain on only one of the upper surface and the lower surface, the polishing tool is used. May be arranged only on the surface where the grinding marks remain.

  In the apparatus A, four polishing tools are arranged in the welding material conveying direction. However, the number of polishing tools is not limited to this and may be two or more. However, even in that case, each polishing tool must be arranged in a zigzag manner in the transport direction, and the polishing disk of the polishing tool must be rotated in-plane so as to be orthogonal to the extending direction of the grinding trace. is there.

According to the present invention, it is possible to automatically polish and remove the band-like grinding marks of the welding material, eliminate the difference in the surface state between the welded portion and the non-welded portion, and improve the surface quality of the welding material.
Therefore, by arranging the polishing apparatus of the present invention in the subsequent stage of the existing grinding apparatus, the surface quality improvement work of the butt welded welding material can be carried out continuously and automatically, and welding with excellent surface quality is achieved. The material can be manufactured with high productivity.

It is a schematic side view which shows the grinding | polishing apparatus A of this invention. It is a perspective view which shows one example of an abrasive | polishing tool. It is a top view which shows the example of arrangement | positioning with respect to the grinding trace of an abrasive | polishing tool. It is a side view which shows the usage example of an abrasive | polishing tool. It is a fragmentary perspective view which shows the channel after grinding the weld bead after butt welding.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Welding material 1A Grinding mark 1B Non-welded part 2 Conveyance roller 3 Rotating roller 4A, 4B Polishing tool 5 Polishing disk 6 Control apparatus

Claims (7)

    A polishing tool in which a polishing disk rotating at the tip of the grinding scar is conveyed while conveying the welding material in which the belt-like grinding trace extends to the surface in the grinding direction after grinding of the weld bead and remains. When polishing and removing with, the two or more of the polishing tools are alternately zigzag arranged in the conveying direction of the welding material so as to cover the band width portion of the grinding mark throughout the polishing tool, and the polishing A welding material polishing method, wherein the disk is pressed against the grinding mark while rotating the disk in a direction perpendicular to the extending direction of the grinding mark.     The method for polishing a welding material according to claim 1, wherein polishing marks existing on the upper surface and the lower surface of the welding material are simultaneously polished.     The method for polishing a welding material according to claim 1 or 2, wherein the polished surface after polishing is further subjected to sandblasting or pickling. A polishing apparatus that polishes and removes the grinding traces of the welding material in which the grinding traces of the weld beads extend in a band shape on the surface of the welded portion and remain,
The apparatus entrance is provided with a transport roller for transporting the welding material,
Two or more polishing discs provided at the tip of the conveyance path located downstream of the conveyance roller, which are in pressure contact with the grinding trace and rotate in a direction orthogonal to the extending direction of the grinding trace in the plane. A polishing apparatus for a welding material, wherein the polishing tool is arranged in a zigzag manner in the conveying direction of the welding material so as to cover the band width portion of the grinding mark with the entire polishing tool.     The welding material polishing apparatus according to claim 4, wherein the rotation directions of the polishing disk in each polishing tool are the same.   The welding material polishing apparatus according to claim 4 or 5, wherein each of the rotation axes of the polishing disk is tiltable with respect to a surface of the grinding mark.   The apparatus for polishing a welding material according to any one of claims 4 to 6, wherein the polishing tool is disposed on an upper surface and a lower surface of the welding material.

Images