Truing method and truing device

Abstract

In a state where a first truer rotation axis is maintained parallel to a grindstone rotation axis, a grindstone outer circumferential surface, and outer circumference arcuate surfaces which are partial surfaces of grindstone arcuate surfaces, and which are continuous to the grindstone outer circumferential surface are trued by using a first truer. In a state where a second truer rotation axis is maintained in a direction perpendicular to the grindstone rotation axis, grindstone end surfaces, and end surface arcuate surfaces which are remaining surfaces of the grindstone arcuate surfaces, and which are continuous to the grindstone end surfaces are trued by using a second truer.

1 : A truing method which performs truing by using:
 first and second truers which true a cylindrical grindstone that is rotated about a grindstone rotation axis to grind a workpiece;   a moving unit which is configured to change a relative position between the first truer and the grindstone, and a relative position between the second truer and the grindstone; and   a controlling unit which is configured to control the moving unit, wherein   the first truer has a first roll which is rotated about a first truer rotation axis that is parallel to the grindstone rotation axis,   the second truer has a second roll which is rotated about a second truer rotation axis that is perpendicular to the grindstone rotation axis,   the grindstone has: a grindstone outer circumferential surface which is a surface that is parallel to the grindstone rotation axis; grindstone end surfaces which are surfaces that are perpendicular to the grindstone rotation axis; and grindstone arcuate surfaces which are surfaces in boundaries between the grindstone outer circumferential surface and the grindstone end surfaces, and which are formed into an arcuate shape, the truing method comprising:   controlling the moving unit by the controlling means unit, in a state where the first truer rotation axis is maintained parallel to the grindstone rotation axis, to true, by using the first truer, the grindstone outer circumferential surface, and outer circumference arcuate surfaces which are partial surfaces of the grindstone arcuate surfaces and which are continuous to the grindstone outer circumferential surface; and   controlling the moving unit by the controlling unit, in a state where the second truer rotation axis is maintained in a direction perpendicular to the grindstone rotation axis, to true, by using the second truer, the grindstone end surfaces, and end surface arcuate surfaces which are remaining surfaces of the grindstone arcuate surfaces and which are continuous to the grindstone end surfaces.   
     
     
         2 : The truing method according to  claim 1 , wherein,
 when truing is performed by using the first truer,   one of the outer circumference arcuate surfaces is trued from a position remotest from the grindstone outer circumferential surface in the one outer circumference arcuate surface, toward a position closest to the grindstone outer circumferential surface in the one outer circumference arcuate surface, the grindstone outer circumferential surface is then trued from a position closest to the one outer circumference arcuate surface in the grindstone outer circumferential surface, toward a position closest to the other outer circumference arcuate surface in the grindstone outer circumferential surface, and the other outer circumference arcuate surface is then trued from a position closest to the grindstone outer circumferential surface in the other outer circumference arcuate surface, toward a position remotest from the grindstone outer circumferential surface in the other outer circumference arcuate surface,   when truing is performed by using the second truer,   one of the end surface arcuate surfaces is trued from a position remotest from one of the grindstone end surfaces in the one end surface arcuate surface, toward a position closest to the one grindstone end surface in the one end surface arcuate surface, and the one grindstone end surface is then trued from a position closest to the one end surface arcuate surface in the one grindstone end surface, toward a position remotest from the one end surface arcuate surface in the one grindstone end surface, and   the other end surface arcuate surface is trued from a position remotest from the other grindstone end surface in the other end surface arcuate surface, toward a position closest to the other grindstone end surface in the other end surface arcuate surface, and the other grindstone end surface is then turned from a position closest to the other end surface arcuate surface in the other grindstone end surface, toward a position remotest from the other end surface arcuate surface in the other grindstone end surface.   
     
     
         3 : The truing method according to  claim 2 , wherein,
 at a start of truing of the one outer circumference arcuate surface, when the first truer is made relatively close to the grindstone toward the position remotest from the grindstone outer circumferential surface in the one outer circumference arcuate surface, the first truer is relatively moved from a side of the one end surface arcuate surface so as to be moved along a first virtual arc which is a virtual arc having a convex direction that is opposite to a convex direction of the grindstone arcuate surface, the first virtual arc being in contact with the grindstone arcuate surface at a boundary position between the one outer circumference arcuate surface and the one end surface arcuate surface, the first virtual arc having a first diameter,   at a start of truing of the one end surface arcuate surface, when the second truer is made relatively close to the grindstone toward the position remotest from the grindstone end surface in the one end surface arcuate surface, the second truer is relatively moved from a side of the one outer circumference arcuate surface so as to be moved along a second virtual arc which is a virtual arc having a convex direction that is opposite to the convex direction of the grindstone arcuate surface, the second virtual arc being in contact with the grindstone arcuate surface at the boundary position between the one outer circumference arcuate surface and the one end surface arcuate surface, the second virtual arc having a second diameter, and,   at a start of truing of the other end surface arcuate surface, when the second truer is made relatively close to the grindstone toward the position remotest from the grindstone end surface in the other end surface arcuate surface, the second truer is relatively moved from a side of the other outer circumference arcuate surface so as to be moved along a third virtual arc which is a virtual arc having a convex direction that is opposite to the convex direction of the grindstone arcuate surface, the third virtual arc being in contact with the grindstone arcuate surface at a boundary position between the other outer circumference arcuate surface and the other end surface arcuate surface, the third virtual arc having a third diameter.   
     
     
         4 : The truing method according to  claim 1 , wherein
 the boundary position which is between the outer circumference arcuate surface and the end surface arcuate surface in the grindstone arcuate surface is a position where a first virtual line that passes through a center of an arc of the grindstone arcuate surface before truing and that has an angle of 45 degrees with respect to the grindstone rotation axis, intersects with the grindstone arcuate surface.   
     
     
         5 : The truing method according to  claim 1 , wherein
 the boundary position which is between the outer circumference arcuate surface and the end surface arcuate surface in the grindstone arcuate surface is a position where,   in a case where a depth by which the grindstone outer circumferential surface is to be trued is indicated as ΔD, and a depth by which the grindstone end surface is to be trued is indicated as ΔW,   a second virtual line intersects with the grindstone arcuate surface, the second virtual line that passes through a center of an arc of the grindstone arcuate surface before truing, and a center of the arc after truing which is a position that is further separated by ΔW in a direction separating from the grindstone end surface from a position that is moved from the center of the arc before truing by ΔD in a direction separating from the grindstone outer circumferential surface.   
     
     
         6 : A truing apparatus comprising:
 a first truer which is disposed for truing a cylindrical grindstone that is rotated about a grindstone rotation axis to grind a workpiece, and which has a first roll which is rotated about a first truer rotation axis that is parallel to the grindstone rotation axis;   a second truer which is disposed for truing the grindstone, and which has a second roll which is rotated about a second truer rotation axis that is perpendicular to the grindstone rotation axis;   a moving unit which is configured to change a relative position between the first truer and the grindstone, and a relative position between the second truer and the grindstone; and   a controlling unit which is configured to control the moving unit, wherein,   by using the moving unit and the controlling unit, based on the truing method according to  claim 1 , the truing apparatus trues the grindstone outer circumferential surface, the grindstone end surfaces, and the grindstone arcuate surfaces of the grindstone.