JP3556769B2 - Grinding tool for H-section steel - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a grinding tool for an H-section steel, and more particularly, it is suitable for grinding various parts of the surface of an H-section steel in order to remove burrs generated on the H-section steel and black scale on the surface. Related to grinding tools.
[0002]
[Prior art]
In general, H-section steel used for steel frames of buildings is cut into required dimensions, and a perforated plate having a predetermined pattern perforated at both ends or at an appropriate position in the middle thereof, and a perforated plate having the same pattern perforated. Are assembled at a construction site or the like by adjusting the positions of the holes by contacting the holes and tightening the two with high-strength bolts.
[0003]
Here, since burrs or burrs usually occur in the perforated portion due to the perforation process, they must be removed. In addition, in order to make the friction coefficient with the joint plate constant, the black scale around the perforated portion ( Rolled black scale or oxide film) needs to be removed by grinding.
[0004]
Conventionally, such a grinding operation has been performed manually by using a hand-held grinding tool called a disk sander. However, the safety and workability of this type of surface grinding operation around a hole are improved. For this purpose, a guide pin is provided coaxially with the rotating shaft on a cup-shaped member fixed to the rotating shaft of the electric motor, and two inner and outer rings are attached concentrically around the guide pin, and each ring is Proposed a hand-held tool dedicated to surface grinding around a hole in a steel material, in which a plurality of segment-shaped grindstones were fixed and each of these rings could be independently displaced in the direction of the rotation axis via a spring. (Japanese Patent Publication No. 7-10502). According to the proposed tool, the electric motor is rotated with the guide pin inserted into a hole formed in a steel material such as an H-section steel, and the whetstone of each ring is moved while the guide pin is moved circularly along the inner peripheral surface of the hole. The inner and outer rings follow the surface of the H-section steel, even if there is some undulation generated during the production process, without the risk of the tool being flipped. As a result, the surface of the steel material around the hole can be reliably ground.
[0005]
On the other hand, as an apparatus for fully automatically grinding the surface around the perforated portion of the H-shaped steel as described above, a material feeding mechanism for the H-shaped steel and a plurality of grinding heads are provided on a square-shaped frame. By feeding the H-beam so as to penetrate the inside and moving each grinding head along its surface while automatically positioning each grinding head on both the flange portion of the H-beam and each perforated portion of the web portion. There has been proposed a surface grinding apparatus for H-section steel capable of efficiently grinding the surface of the H-section steel around the perforated portion (Japanese Patent Application Laid-Open No. 8-108353).
[0006]
[Problems to be solved by the invention]
By the way, the handy tool dedicated to surface grinding around a hole based on the above proposal is a grinding tool to be mounted on the grinding head of the above-described fully automatic H-shaped steel surface grinding apparatus by removing a center guide pin. In this case, it is preferable to reduce the diameter of the inner and outer rings as much as possible in order to improve the followability of the surface to be ground to the undulation. However, when the diameter of the ring is reduced to a certain degree or more in proportion to the diameter of the hole, when the whetstone is moved while pressing the grinding stone against the surface to be ground by a fully automatic surface grinding device, each ring is independent. Since the outer ring is large enough to be displaceable in the axial direction of the rotating shaft, there is no problem because the outer ring is large enough, but the segment-shaped grinding stone fixed to the inner ring is deeply penetrated into the periphery of the hole, Troubles such as chipping or scraping the peripheral portion of the hole into a sliver shape occur.
[0007]
Specifically, for example, when the diameter of the inner ring is 36 mm, when a hole of about 26 mm is drilled in the H-shaped steel, a part of the plurality of segment-shaped grinding wheels of the inner ring is formed on the periphery of the hole. It becomes deeper than the outer ring with the inner ring slightly inclined. In this case, most of the grindstones of the inner ring are chipped, and the peripheral edge of the hole is shaved by the grindstones to cause processing defects.
[0008]
The present invention has been made in view of such circumstances, and even if the diameter of a ring for fixing a segment-shaped grindstone, particularly the diameter of an inner ring, is reduced, each segment-shaped grindstone is difficult to surround the hole. It is an object of the present invention to provide a grinding tool for H-section steel which can perform stable surface grinding using a fully automatic surface grinding device, particularly without using a grinding machine.
[0009]
[Means for Solving the Problems]
In order to achieve the above object, a grinding tool for H-section steel of the present invention is provided with a holding member fixed to a shaft end of a rotating shaft, and supported concentrically with respect to the holding member. It has outer and inner rings to which the rotation of the rotating shaft is transmitted, and a plurality of segment-shaped grinding wheels are concentrically fixed to the outer and inner rings, respectively, while the outer and inner rings are Each is displaceable in the direction of approaching / separating from the holding member, and is urged by the elastic body in the direction of separating from the holding member, and the inner ring is in the direction approaching the holding member. It can be displaced independently, and in the direction of separation, the amount of separation from the holding member is regulated between the outer ring and the contact position that does not protrude from the outer ring. Separated by Characterized by being displaceably configured follow manner according to the displacement amount of the displacement freely outer ring that direction.

[0010]
According to the grinding tool for H-section steel of the present invention, similarly to a handy type tool dedicated to surface grinding around a hole based on the above-described proposal, even if there is a certain amount of undulation on the surface to be ground, the inner surface is appropriately followed. -The outer ring is displaced in a direction approaching / separating from the holding member, and its surface can be ground substantially uniformly. In this follow-up operation, the inner ring is displaced independently of the outer ring in the direction approaching the holding member, but the outer ring abuts on the outer ring in the direction away from the holding member and the amount of separation is reduced. Be regulated. Therefore, even if the diameter of the inner ring is reduced in proportion to the diameter of the hole drilled in the surface to be ground, when the inner ring arrives at the position of the hole, the inner ring is restricted by the outer ring. Because it does not protrude further from the flange, that is, it does not protrude toward the surface to be ground, it prevents the segment-shaped grinding wheel fixed to the inner ring from trying to cut the periphery of the hole deeply can do.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION
FIG. 1 is a longitudinal sectional view of an embodiment of the present invention, and FIG. 2 is a bottom view thereof.
The holding member 1 has a disk shape as a whole, and at the center thereof, a female screw 1a for attaching to the rotating shaft 10 and a female screw 1b for screwing a later-described center bolt 7 coaxially with the female screw 1a. Has been cut. The rotary shaft 10 is, for example, a grindstone shaft of a grindstone head of the above-described fully automatic H-shape surface grinding device, and is formed by screwing a male screw 10a formed at the shaft end and a female screw 1a of the holding member 1. The holding member 1 is fixed to the shaft end of the rotating shaft 10 by the combination.
[0012]
The holding member 1 has a plurality of through holes 1c formed around the female screws 1a and 1b around the center thereof. In each of the through holes 1c, a guide bolt 2 has its head 2a directed upward. It is slidably inserted. Each of the guide bolts 2 has its tip formed on the outer ring 3 and is screwed into a screw, whereby the outer ring 3 is supported so as to be able to approach and separate from the holding member 1 and has its separated end. Is restricted by the contact between the head 2a of the guide bolt 2 and the upper surface of the holding member 1, and the rotation of the holding member 1 is transmitted to the outer ring 3 by the guide bolt 2. The outer ring 3 is urged by a compression coil spring 4 inserted between the outer ring 3 and the holding member 1 so as to be separated from the holding member 1, and when no external force acts thereon, as shown in FIG. It is located at a remote end from the holding member 1.
[0013]
The inner ring 5 provided coaxially with the outer ring 3 is not directly supported by the holding member 1, but is supported indirectly to and away from the holding member 1 indirectly via the outer ring 3. Have been. That is, the inner ring 5 is disposed so as to be displaceable along the inner peripheral surface of the outer ring 3 in the vertical direction in the drawing, that is, in a direction approaching / separating from the holding member 1, and the outer peripheral portion of the inner ring 5. Is formed with a flange portion 5a. The flange portion 5a abuts a step 3a formed on the inner peripheral portion of the outer ring 3 so that the separation end of the inner ring 5 from the holding member 1 is regulated. . The inner ring 5 is also urged in a direction away from the holding member 1 by a compression coil spring 6 inserted between the inner ring 5 and the inner ring 5 when no external force is applied. Reference numeral 5 denotes a state in which the collar portion 5a is in contact with the step portion 3a of the outer ring 3 as shown in FIG. In a state where the collar portion 5a of the inner ring 5 is in contact with the step portion 3a of the outer ring 3, the distal end surface (the lower end surface in FIG. 1) of the inner ring 5 and the distal end surface (the same) of the outer ring 3 It will be in the state located on the same plane.
[0014]
The rotation of the holding member 1 is transmitted to the inner ring 5 by the center bolt 7. That is, a parallelogram-shaped through hole 5b is formed at the center of the inner ring 5. The head 7a of the center bolt 7 has a parallelogram cross-sectional shape substantially equal to the contour of the through hole 5b, and the head 7a of the center bolt 7 is inserted into the through hole 5b. In this state, the screw portion at the tip is formed in the center of the holding member 1 and is screwed into the screw 1b, so that the rotation of the holding member 1 is also transmitted to the inner ring 5 via the center bolt 7.
[0015]
Then, over the outer ring 3 and inner ring 5, as shown in FIG. 2, each grinding wheel W ₃ of coaxially with each other on the lower end surfaces of the plurality of segmented · · _{W 3,} W ₅ · · _{W 5} Each of the segment-shaped grinding wheels W ₃ ... W ₃ , W ₅ ... W ₅ has the same thickness, and therefore the state shown in FIG. in contact with the step portion 3a of the outer ring 3, all grinding wheel _W 3 · · _W 3 secured to the ring 3, _5, W 5 distal end surface of the · · _{W 5} (lower end surface in FIG. 1) is identical Is located on the plane of.
[0016]
As described above, the embodiment of the present invention is mounted on, for example, a grinding wheel shaft of a fully automatic H-shaped steel surface grinding apparatus. In that case, as shown in the sectional view during the grinding operation in FIG. 3 (A), the grinding wheel _{W 3 ·· W 3, W 5} ·· W 5 tip surface peripheral surface of the drilling pattern P of H-section steel Is moved along the surface while being pressed against the burrs and burrs formed around each hole h in accordance with the trajectory T as illustrated in FIG. Alternatively, black scale around the perforation pattern P is removed. In such an operation, even if the surface of the H-section steel has a certain degree of undulation, the outer ring 3 and the inner ring 5 are appropriately moved toward and away from the holding member 1 or follow the through holes 5b, By slightly tilting within the play gap of 1c, the surface can be ground uniformly. At this time, the inner ring 5 is independently displaced with respect to the outer ring 3 in a direction approaching the holding member 1, but is in contact with the stepped portion 3 a of the outer ring 3 in a direction away therefrom. since it is restricted displaced by the tip surfaces of the grinding wheel W ₅ · · _{W 5} of the inner ring 5 protrudes relative to the holding member 1 from the tip surface of each grinding wheel W ₃ · · _{W 3} of the outer ring 3 Therefore, even if each of the grinding wheels W ₅ ... W _{5 of the} inner ring 5 arrives on the hole h formed in the H-section steel, they are deeply cut into the periphery of the hole h, There is no problem that the peripheral edge of h is cut into a sliver.
[0017]
【The invention's effect】
As described above, according to the present invention, the inner and outer rings are concentrically supported on the holding member fixed to the shaft end of the rotating shaft so that they can approach and separate from each other. The rings are urged by an elastic body in a direction away from the holding member, and a plurality of segment-shaped grindstones are fixed to each of the rings, and the separated ends of the inner ring with respect to the holding member are moved to the outer ring. Since the inner and outer rings are made smaller so that the surface to be ground can follow the undulations well, the grinding wheel of the inner ring cuts the surface As a result, it is possible to reliably prevent the hole from deeply penetrating into the periphery of the drilled hole. There is eliminated, particularly when applied to an apparatus for grinding the surface in the vicinity of the perforation pattern of H-beam fully automated, it has become possible to the grinding operation as stable and reliable.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of an embodiment of the present invention. FIG. 2 is a bottom view thereof. FIG. 3 is an explanatory view of a use state of the embodiment of the present invention. Explanatory drawing (B) of an example of the grinding locus
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Holding member 1a, 1b Female thread 1c Through hole 2 Guide bolt 2a Head 3 Outer ring 3a Step 4,6 Compression coil spring 5 Inner ring 5a Collar 5b Through hole 7 Center bolt 7a Head 10 Rotary shaft (grinding wheel shaft) )
10a male screw

Claims (1)

A tool for grinding the surface of an H-section steel, comprising: a holding member fixed to a shaft end of a rotating shaft; and a concentrically-supported supporting member for the holding member. Outer and inner rings to which the rotation is transmitted. A plurality of segment-shaped grindstones are fixed concentrically to the outer and inner rings, respectively, while the outer and inner rings are respectively held by the holding member. Is displaceable in the direction of approaching and separating from the holding member, and is urged by an elastic body in the direction of separating from the holding member, and the inner ring is independent of the direction approaching the holding member. It is displaceable, and in the direction of separation, the amount of separation from the holding member is regulated between the outer ring and the contact position that does not protrude from the outer ring by contact with the outer ring, and the member is separated by the urging force of the elastic body. direction Displacement freely outer ring H-beams for grinding tool, characterized in that it is displaceably configured follow manner in accordance with the displacement of the.

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