JP6489327B2 - Cup type rotating grindstone - Google Patents

Description

  The present invention relates to a cup-type rotary grindstone that is used by being attached to a rotary shaft of a rotary tool for surface repair for peeling off an old coating film applied to the surface of a metal structure or the like.

Conventionally, when peeling off the old paint film on the surface of a steel structure, attach a rotating grindstone with a grinding tip made of sintered diamond to the rotating shaft of a rotating tool such as a grinder, and use the cutting edge of the grinding tip to go around. It was scraped off and peeled off. In this type of rotary grindstone, the lower surface of the outer peripheral edge of a cup-type base metal having a rotation shaft mounting hole in the center is formed in a flat portion having a predetermined width, and a grinding tip is provided along the circumferential direction on the flat portion. The thing arrange | positioned in the position mutually spaced apart is proposed (refer patent documents 1-3).
Since the cup-type rotary grindstone disclosed in Patent Documents 1 to 3 is disposed within a predetermined width in the radius inside / outside direction of the flat portion without protruding the grinding tip outside the outer peripheral edge of the flat portion, When the top of the tip rotates in contact with the surface of the material to be ground, it is possible to evenly peel off the old film applied to the base surface, and scratches are formed on the base of the old paint film to be peeled off. Not. When a new coating is applied to the unscratched substrate and finished, it has the same aesthetics as when the structure was completed.
However, because the cutting edge of the grinding tip of the cup-type rotary grindstone is made of sintered diamond and is extremely hard, the flat part and the base surface can maintain a parallel positional relationship. Even when it is slightly inclined, it rotates at high speed. In addition to the old coating film, which is the object to be ground, with the cutting edge of the rotating grindstone, there is a problem that the ground is also scraped off and a linear scratch is formed on the ground. Even when a new paint film is applied to the ground surface on which scratches are formed, the scratches on the ground surface are visually recognized from the new paint film, and there is a problem that the finish is significantly deteriorated compared to when the structure is completed. .
Also, in order to peel off the old coating film without forming scratches on the ground surface, it is necessary for the flat surface of the rotating grindstone to always maintain a positional relationship parallel to the ground surface, and the operator has excellent skills. There was a problem of being required.
JP 2004-74318 A JP-A-11-165262 Patent Publication No. 3623085

The problem to be solved by the present invention is that when the cup-type rotary whetstone is brought into contact with the old coating film, the bottom flat portion of the cup-type rotary whetstone and the ground surface on which the old coating film is applied are maintained in a parallel positional relationship. If not, the ground surface is scratched with the cutting edge of the grinding tip.
The present invention provides a cup-type rotation that provides a bulging portion with a predetermined positional relationship with the cutting edge of the grinding tip on the bottom surface of the rotating grindstone and does not form scratches on the underlying surface even when the flat portion is inclined with respect to the underlying surface. The object is to provide a grinding wheel.

In order to achieve the above object, the invention according to claim 1 of the present invention is attached to the rotary shaft of a rotary drive tool for surface repair to peel off the old paint film applied to the foundation surface of the structure. A cup-type rotary grindstone for scraping and removing the old paint film with the cutting edge of a grinding tip that rotates around the axis of the shaft, and the bottom surface of the cup-type base metal with a mounting hole for the rotary shaft in the center is A cup shape in which a bottom surface is formed in a ring-shaped flat portion having a predetermined width in the radial inside and outside directions, and a grinding tip having a cutting edge facing the rotation direction of the rotating grindstone is disposed at a position spaced apart along the circumferential direction in the flat portion. In the rotating grindstone, scratches cannot be formed on the base surface with the cutting edge of the grinding tip, and a scratch formation avoiding means is provided on the bottom surface of the cup-type base metal in the rotational direction of the grinding tip. Cup type of grinding tip A bulging portion that protrudes in a curved shape from the flat portion to the outer surface of the lower end of the cup-type base metal is provided in front of the rotation direction of the gold, and the bulge portion provided at the center and the flat portion side of the cup-type base metal is provided. The vertical distance between the top of the bulging part on the flat part side and the surface of the flat part is flat with the lower edge of the cutting edge of the grinding tip. The vertical distance between the bottom edge of the grinding tip and the flat part surface is set to be longer than the vertical distance with the part surface, and the radius inside the boundary part is the top part of the bulging part on the flat part side and the flat part. When the flat part is set to be longer than the vertical distance from the surface and the flat part is inclined with respect to the base surface, the tip of the grinding tip does not come into contact with the surface of the old paint film, and the bulging part is in sliding contact with the old paint. If the flat part is used in a positional relationship parallel to the underlying surface without peeling off the film, Bulging portion, characterized in that the cutting edge of at grinding chips radially inward from the boundary portion without abutting was made to grind peeled sliding contact with the old coating film former coating surface.
According to the second aspect of the present invention, in the surface repair for peeling off the old coating film applied to the foundation surface of the structure, the grinding tip attached to the rotary shaft of the rotary drive tool and rotating around the axis of the rotary shaft is provided. A cup-type rotary grindstone for scraping and removing the old paint film with the blade tip, and the bottom surface of the cup-type base metal with a mounting hole for the rotation shaft in the center is a ring shape with a predetermined width in the radius inside and outside directions. In a cup-type rotary grindstone formed on a flat portion, and a grinding tip having a cutting edge directed in the rotation direction of the rotary grindstone is disposed at a position separated along the circumferential direction, Scratch formation avoiding means is provided on the bottom surface of the cup-type base metal in front of the grinding chip in the rotation direction, and the scratch formation avoiding means rotates the cup-type base metal of the grinding chip from the grinding chip. Grinding tip located forward in the direction In this range, an arcuate bulge is provided in the bottom view that bulges from the midway position of the flat portion in the radius inward / outward direction to the outer peripheral edge, and the arcuate bulge is formed from the center of the cup-type base metal. A boundary on the circumference having a radius extending to the top of the projecting portion is defined as a boundary portion, and on the outside of the radius from the boundary portion, the vertical distance between the top portion of the arc-shaped bulging portion and the surface of the flat support portion is determined as follows. The vertical distance between the lower edge of the blade edge and the surface of the flat part is set longer, and the distance between the lower edge of the grinding tip and the surface of the flat part on the radius inside from the boundary part is the vertical distance of the arcuate bulge. When the vertical part is set to be longer than the vertical distance between the top part and the flat part surface, and the flat part is inclined with respect to the base surface, the cutting edge of the grinding tip does not come into contact with the old paint film surface, and the arc-shaped bulge The flat surface is parallel to the ground surface without peeling off the old paint film by sliding the surface. When used in a vertical position, the arc-shaped bulge does not come into contact with the surface of the old paint film, and the cutting edge of the grinding tip on the radius inside from the boundary is in sliding contact with the old paint film. It is characterized by grinding and peeling.

  In the present invention, when the flat portion formed on the bottom surface of the rotating grindstone and the base surface are rotated, the bulge portion of the curved surface comes into contact with the base surface, so that the cutting edge of the grinding tip contacts the base surface. Since the contact is prevented, there is an effect that the cutting edge of the grinding tip is not attached to the surface of the base and is not damaged.

It is a front view of a cup type rotating grindstone. Example 1 It is a top view of a cup type rotating grindstone. Example 1 It is a bottom view of a cup type rotating grindstone. Example 1 It is a notch longitudinal cross-section explanatory drawing which shows the relationship between a bulging part and a flat part. Example 1 It is a notch longitudinal cross-section explanatory drawing which shows the relationship between a grinding tip and a flat part. Example 1 It is explanatory drawing which shows the positional relationship with respect to the base surface of a bulging part and a grinding chip when the flat part of a cup type rotary grindstone bottom face is inclined with respect to the base surface. Example 1 It is a notch bottom view of the ring-shaped convex part flat part of a cup type rotary grindstone which shows the attachment state of a grinding tip and a bulging part. (Example 2) It is a notch front view of the lower end part of the cup type rotary grindstone which shows the attachment state of a grinding tip and a bulging part. (Example 2) It is a notch longitudinal cross-section explanatory drawing which shows the relationship between a bulging part and a flat part. (Example 2) It is a notch bottom view of the ring-shaped convex part flat part of a cup type rotary grindstone which shows the attachment state of a grinding tip and a bulging part. (Example 3) It is a notch front view of the flat part of the ring-shaped convex part of a cup type rotary grindstone which shows the attachment state of a grinding tip and a bulging part. (Example 3) It is a notch longitudinal cross-section explanatory drawing which shows the relationship between a bulging part and a flat part. (Example 3) It is a bottom view of a cup type rotating grindstone. Example 4 It is a top view of a cup type rotating grindstone. Example 4 It is a bottom view of a cup type rotating grindstone. (Example 5) It is a top view of a cup type rotating grindstone. (Example 5) It is a partially cutaway front view of a cup type rotating grindstone which shows the attachment state of a bulging part. (Example 6) It is the sectional view on the AA line of FIG. (Example 6) It is a front view of a cup type rotating grindstone. (Example 7) It is a top view of a cup type rotating grindstone. (Example 7) It is a bottom view of a cup type rotating grindstone. (Example 7) It is BB sectional drawing of FIG. (Example 7) It is a notch longitudinal cross-section explanatory drawing of the grinding tip which shows the relationship between a bulging part and a grinding tip. (Example 7) It is a notch longitudinal cross-section explanatory drawing which shows the relationship between a bulging part and a flat part. (Example 7) It is a notch longitudinal cross-section explanatory drawing of a dust discharge part. (Example 7)

  A flat part provided on the flat part provided on the periphery of the bottom surface of the cup-type rotating grindstone is provided with a bulging part in which the cutting edge is disposed in the flat part and the cutting edge is spaced apart in the circumferential direction with the cutting edge spaced apart in the circumferential direction. When the cup-type rotating grindstone is rotated in a state where the positional relationship between the surface and the base surface cannot be maintained in parallel, the bulging portion should slidably contact the workpiece and the grinding tip should not contact the workpiece. Thus, it was realized that the ground surface of the ground was not damaged by the cutting edge of the grinding tip.

A first embodiment shown in FIGS. 1 to 6 will be described.
The cup-type rotating grindstone is formed by connecting ring-shaped convex portions 2 to the entire outer periphery of the cup-type base metal 1. The cup-type base 1 is inclined outwardly toward the entire periphery of the ceiling part 4 in a plan view and a bottom view in which a mounting hole 3 for attaching a rotating shaft of an electric rotary tool is opened in the center. The inclined surfaces 5 are integrally connected and formed in a cup shape as a whole. The ring-shaped convex portion 2 has a predetermined width in the radial inner and outer directions and a predetermined width in the vertical direction, and the bottom surface is formed in a flat portion 6 having a positional relationship parallel to the top portion 4. Within a range of a predetermined width in the radial direction inside and outside of the flat portion 6, there are disposed grinding tips 8 that are spaced apart at a predetermined interval along the circumferential direction and that have the cutting edge 7 directed in the rotation direction of the cup-type rotating grindstone. It is installed. The grinding tip 8 is made of a sintered diamond. When the grinding tip 8 is viewed from the rotational direction of the cup-type rotary grindstone, the cutting edge surface has a vertical distance from the surface of the flat portion 6 to the lower edge of the cutting edge 7 of the grinding tip 8. The flat portion 6 is formed in a substantially right triangle shape that gradually increases from the outside to the inside. In other words, when the cutting edge 7 is viewed from the front in the rotational direction, the cutting edge 7 is inclined so that the height gradually increases from the outside to the inside of the flat portion 6, and the highest part of the cutting edge 7, that is, the cutting edge. 7 is set so as to grind the old coating film at the inner portion of the plate.

The ring-shaped convex part 2 is provided with a bulging part 9 between grinding chips 8 adjacent to each other in the circumferential direction. The bulging portion 9 bulges in a curved surface from the midway position in the width direction of the flat portion 6 of the ring-shaped convex portion 2 to the lower end outer surface 11 of the ring-shaped convex portion 2 through the flat portion outer peripheral edge corner portion 10. ing.
As an example of the manufacturing method, the flat portion 6 and the lower end outer surface 11 communicate with each other around the flat portion outer peripheral edge corner 10 of the ring-shaped convex portion 2, and the flat portion 6, the flat portion outer peripheral edge corner 10 and A spherical groove that opens on the lower end outer surface 11 is recessed, and a spherical body that conforms to the inner surface shape of the spherical groove is fitted into the spherical groove so that a part of the spherical body surface protrudes from the opening of the spherical groove. It is conceivable that a spherical body is integrally fixed to the convex portion 2 so that the surface of the spherical body attached to the ring-shaped convex portion 2 becomes the bulging portion 9. The bulging portion 9 is not limited to fitting a spherical body into a spherical groove recessed in the ring-shaped convex portion 2, and a bulged portion integrally formed with the ring-shaped convex portion 2 may also be used. It is included in the present invention.

  Referring to FIGS. 3 and 6, the bulging portion 9 is disposed between the bulging portion 9 and another bulging portion 9 disposed immediately behind the cup-type base metal 1 in the rotation direction. The relationship with the grinding tip 8 will be described. A circle whose radius is a line connecting the position of the perpendicular line 12 from the top of the bulging part 9 disposed on the flat part 6 side of the ring-shaped convex part 2 to the flat part 6 and the center of the cup-shaped base metal 1. The circumference is the boundary portion 13, and the surface position of the bulging portion 9 is different from the position of the lower end edge on the front side in the rotational direction of the cutting edge 7 of the grinding tip 8. That is, outside the boundary portion 13, the position of the bulging portion 9 on the radius of the cup-type base metal is the position of the lower end edge of the front side surface in the rotational direction of the cutting edge 7 of the grinding tip 8 disposed just behind the bulging portion 9. It is set to protrude outward. Inside the boundary portion 13, the position of the lower edge on the front side surface in the rotational direction of the cutting edge 7 of the grinding tip 8 disposed just behind the bulging portion 9 is more than the position of the bulging portion 9 on the cup-type base metal radius. It protrudes outward.

  Next, functions and effects will be described. In the present invention, the rotary shaft of the electric rotary tool is integrally attached to the mounting hole 3, and the flat portion 6 is used while rotating the rotary shaft while maintaining the positional relationship parallel to the base surface 14. When the flat portion 6 is in a state in which the base surface 14 is held in parallel, the old coating film is uniformly peeled from the base surface 14 with the cutting edge 7 inside the boundary portion 13 of the grinding tip 8 provided on the flat portion 6. . As shown in FIG. 6, when the flat portion 6 and the base surface 14 cannot be maintained in a parallel positional relationship and are inclined, the base surface is tangential and the spherical surface of the bulging portion 9 slides, and the cutting edge 7 is the base Since the surface cannot be contacted, the ground surface is not damaged.

  A second embodiment shown in FIGS. 7 to 9 will be described. The bulging portion 18 includes a substantially hemispherical portion 181 and a flat surface 182. From the flat portion 15 to the lower end outer surface 17, the substantially hemispherical portion 181 faces the rotation direction and the flat surface 182 faces the direction opposite to the rotation direction. Is provided. The flat surface 182 is preferably along the radial extension line of the cup-type base metal.

  A third embodiment shown in FIGS. 10 to 12 will be described. A capsule-shaped bulging portion 22 is provided across the flat portion 19, the flat portion outer peripheral edge corner portion 20, and the lower end outer surface 21. In the bulging portion 22, the major axis of the longitudinal section is along the vertical direction of the ring-shaped convex portion 23 on the lower end outer surface 21.

  A fourth embodiment shown in FIGS. 13 and 14 will be described. Seven grinding chips 8 are arranged on the flat portion 25 of the ring-shaped convex portion 24 so as to be spaced apart in the circumferential direction with a predetermined interval. Between the grinding tip 8 and the grinding chip 8 adjacent in the circumferential direction, bulging portions 26 are provided at two locations. The top portions on the flat portion 25 side of these two bulging portions 26 and 26 are located on the same circumference. With this circumferential position as a boundary portion, the cutting edge of the grinding tip 8 is set to be positioned below the top of the bulging portion 26 inside the boundary portion. Outside the boundary portion, the top of the bulging portion 26 protrudes so as to be positioned below the cutting edge of the grinding tip 8. When the cup-type base metal is inclined and slidably contacted with the ground surface, the spherical surface of the bulging portion 26 that bulges toward the flat portion 25 slidably contacts with the ground surface as a tangent, and is ground. The cutting edge of the tip 8 does not contact the base surface, and the base surface is not damaged. When the flat portion 25 and the underlying surface are in parallel, the old coating on the underlying surface is peeled off with the cutting edge of the grinding tip 8 inside the boundary portion.

  A fifth embodiment shown in FIGS. 15 and 16 will be described. On the flat portion 28 of the ring-shaped convex portion 27, five grinding chips 8 are provided at a predetermined interval in the circumferential direction. Two bulging portions 29 and 29 are provided between the adjacent grinding chips 8 and 8. Of the two bulging portions 29 disposed between the grinding chips 8, 8, the top portions protruding toward the flat portion 28 are located on the same circumference. When the cup-type base metal is inclined and slidably contacted with the ground surface, the spherical surface outside the top of the bulging portion 29 that bulges on the flat portion 28 is in sliding contact with the ground surface as a tangent, and the cutting edge contacts the ground surface. Since it does not contact, the surface of the base is not damaged.

  A sixth embodiment shown in FIGS. 17 and 18 will be described. The ring-shaped convex portion 30 is provided with bulged portions 31 with a predetermined interval along the circumferential direction. The bulging portion 31 includes a dome-shaped upper and lower surface and a curved surface, the dome-shaped lower surface bulges from the bottom surface of the flat portion 32, and the curved surface projects outward from the lower end portion outer surface 33. A part of the dome-shaped upper surface protrudes outward from the ring-shaped convex portion 30.

  A seventh embodiment shown in FIGS. 19 to 25 will be described. A flat portion 35 having a positional relationship parallel to the ceiling portion 4 is provided on the bottom surface of the ring-shaped convex portion 34, and the grinding tips 37 with the cutting edge 36 facing the rotation direction of the cup-type rotating grindstone are spaced apart at a predetermined interval in the circumferential direction. It is arranged at the position. Between the grinding chips 37 adjacent to each other in the circumferential direction, a bulging portion 38 having an arc shape in a bottom view is provided on the outer peripheral edge of the ring-shaped convex portion 34 outside the flat portion 35. The top portion of the bulging portion 38 is defined as a boundary portion, and the vertical distance between the flat portion 35 and the blade edge 36 is set longer than the vertical distance between the flat portion 35 and the boundary portion inside the boundary portion, and the flat portion 35 is formed outside the boundary portion. The vertical distance of the blade edge 36 is set shorter than the vertical distance between the flat portion 35 and the boundary portion. As shown in FIG. 25, the dust discharge groove 39 is configured to discharge the generated dust to the outside of the cup-type base metal by providing a non-bulge portion in a part of the bulge portion 38. In the seventh embodiment, the case where the dust discharge groove 39 is provided at one location in the bulging portion 38 has been described as an example. However, by providing a non-bulging portion at an arbitrary position of the bulging portion 38, a plurality of dust discharge grooves are provided. May be provided. The number of dust discharge grooves formed is arbitrary.

1 Cup-type base metal 2, 23, 24, 27, 30, 34 Ring-shaped convex part 3 Mounting holes 6, 15, 19, 25, 28, 32 Flat part 7, 36 Cutting edge 8 Grinding tips 9, 18, 22, 26, 29, 31 Swelling portion 10, 16, 20 Flat portion outer peripheral edge corner portion 11, 17, 21, 33 Lower end outer surface 13 Boundary portion 14 Base surface

Claims (2)

For surface repair that peels off the old paint film applied to the foundation surface of the structure, the old paint film is scraped and removed with the cutting edge of a grinding tip attached to the rotary shaft of the rotary drive tool and rotating around the axis of the rotary shaft. A cup-type rotary grindstone for
The bottom surface of the cup-type base metal having a mounting hole for the rotating shaft in the center is formed into a ring-shaped flat portion having a predetermined width in the radial inside and outside directions when viewed from the bottom, and the cutting edge is directed to the rotating portion of the rotating grindstone in the flat portion. In the cup-type rotary grindstone in which the grinding chips are arranged at positions separated along the circumferential direction,
It is impossible to form scratches on the ground surface with the cutting edge of the grinding tip.
The flaw formation avoiding means is provided with a bulging portion that protrudes in a curved shape from the flat portion to the outer surface of the lower end of the cup-shaped base metal in front of the grinding chip at the flat portion in the rotational direction. ,
The boundary on the circumference with the radius of the center of the cup-type base metal and the top of the bulging part provided on the flat part side,
The vertical distance between the top of the bulging part on the flat part side and the flat part surface is set longer than the vertical distance between the lower edge of the cutting edge of the grinding tip and the flat part surface outside the boundary part on the radius side.
The vertical distance between the lower edge of the cutting edge of the grinding tip and the flat part surface is set longer than the vertical distance between the top of the bulging part on the flat part side and the flat part surface on the radius inside from the boundary part,
When using the flat part inclined with respect to the base surface, the cutting edge of the grinding tip does not come into contact with the surface of the old paint film, and the bulging part does not slide and peel off the old paint film,
When the flat part is used in a positional relationship parallel to the base surface, the bulging part does not come into contact with the old paint film surface, and the cutting edge of the grinding tip on the radius inside from the boundary part slides on the old paint film surface. A cup-type rotary grindstone characterized by grinding and peeling off an old coating film. For surface repair that peels off the old paint film applied to the foundation surface of the structure, the old paint film is scraped and removed with the cutting edge of a grinding tip attached to the rotary shaft of the rotary drive tool and rotating around the axis of the rotary shaft. A cup-type rotary grindstone for
The bottom surface of the cup-type base metal having a mounting hole for the rotating shaft in the center is formed into a ring-shaped flat portion having a predetermined width in the radial inside and outside directions when viewed from the bottom, and the cutting edge is directed to the rotating portion of the rotating grindstone in the flat portion. In the cup-type rotary grindstone in which the grinding chips are arranged at positions separated along the circumferential direction,
It is impossible to form scratches on the ground surface with the cutting edge of the grinding tip.
In the range from the grinding tip to the grinding tip positioned forward in the rotational direction of the cup-type base metal of the grinding tip, the scratch formation avoiding means is arranged from a midway position in the radial inner / outer width of the flat portion to the outer peripheral edge. A bulging portion having a circular arc shape is formed on the bottom side and bulges downward.
The boundary on the circumference with a radius from the center of the cup-shaped base metal to the top of the arcuate bulge,
The vertical distance between the top of the arcuate bulge and the surface of the flat part is set to be longer than the vertical distance between the lower edge of the cutting edge of the grinding tip and the surface of the flat part on the outer radius side from the boundary part,
The vertical distance between the lower edge of the cutting edge of the grinding tip and the flat part surface is set longer than the vertical distance between the top of the arcuate bulge and the flat part surface on the radius inside from the boundary part,
When the flat part is inclined with respect to the base surface, the old paint film can be peeled off by sliding the surface of the arcuate bulging part without contacting the cutting edge of the grinding tip to the surface of the old paint film. Not
When the flat part is used in a positional relationship parallel to the ground surface, the cutting edge of the grinding tip on the radius inside from the boundary part does not slide on the old paint film surface without contacting the arcuate bulge part on the old paint film surface. A cup-type rotary whetstone characterized by contacting and peeling off an old coating film with a blade edge.

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