JP2019072797A - Grinding device and method for molding the same - Google Patents

Abstract

To allow the whole area of a grinding surface to be molded in a grinding wheel having the grinding surface in a circular arc-shape.SOLUTION: A grinding surface 23 of a grinding wheel 22 is formed in a circular arc-shape which protrudes outward in a radial direction when viewed from a direction orthogonal to a rotation shaft J of the grinding wheel 22. A rotation shaft A of a molding tool 32 extends in a direction nearly orthogonal to the rotation shaft J of the grinding wheel 22. The molding tool 32 is turned and moved along the grinding surface 23 of the grinding wheel 22 by a turnably moving device 35.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a grinding apparatus and a method of forming the same.

  Conventionally, a truing device that performs truing by grinding the ground surface of a grinding wheel is known (see, for example, Patent Document 1).

  In Patent Document 1, the rotation axis of the grinding wheel and the rotation axis of the truing tool are arranged in parallel, and the truing tool is moved in the normal direction and the axial direction with respect to the grinding surface of the grinding wheel. An arrangement is disclosed that is adapted to

  Also, as a grinding device for grinding the wall surface of the groove formed on the inner surface of the cylindrical work, a grinding head provided with a disc-like grinding wheel rotationally driven about a horizontal axis at the tip of the shaft-like arm portion It is known to insert an arm portion into a cylindrical work and grind a groove formed in the inside with a side surface of a grinding wheel (see, for example, Patent Document 2).

Japanese Patent Application Laid-Open No. 60-29276 JP 2004-195604 A

  By the way, when grinding the inner surface of a cylindrical work with the side of the grinding wheel as in the grinding apparatus of Patent Document 2, depending on the shape of the grinding surface of the grinding wheel, forming the grinding surface of the grinding wheel (truling or dressing) You may not be able to

  Specifically, in the case of grinding an arc-shaped recessed groove seen in the axial direction on the inner surface of a cylindrical work, an arc-shaped ground surface projecting radially outward corresponding to the arc-shaped groove It is necessary to use a grinding wheel having Therefore, in order to form the grinding surface of the grinding wheel, it is necessary to move the forming device relatively along the arc-like grinding surface.

  However, in the grinding apparatus in which the rotation axis of the grinding wheel and the rotation axis of the forming tool are arranged in parallel as in Patent Document 1, the forming tool is moved along the arc-like grinding surface Along the way, the rotation axis of the grinding wheel intersects with the rotation axis of the forming tool and interferes. Therefore, the entire surface of the arc-shaped grinding surface can not be formed.

  This invention is made in view of this point, The objective is to enable it to shape | mold the whole surface of a grinding surface with respect to the grinding wheel which has a circular-arc-shaped grinding surface.

  The present invention provides a grinding apparatus comprising a work support base for supporting a work, a grinding head having a grinding wheel for grinding the work, and a forming unit for forming a grinding surface of the grinding wheel while rotating a forming tool. Targeted, the following solutions were taken.

That is, in the first invention, the grinding surface of the grinding wheel is formed in an arc shape projecting outward in the radial direction when viewed from the direction orthogonal to the rotation axis of the grinding wheel.
The rotation axis of the forming tool extends in a direction substantially orthogonal to the rotation axis of the grinding wheel,
The apparatus is characterized by further comprising a pivoting unit for pivoting the forming tool along the grinding surface of the grinding wheel.

  In the first invention, the grinding surface of the grinding wheel is formed in an arc shape. The rotation axis of the grinding wheel and the rotation axis of the forming tool are substantially orthogonal to each other. The forming tool is pivotally moved along the arc-shaped grinding surface of the grinding wheel by the pivotal movement unit.

  Thereby, the entire surface of the grinding surface can be formed with respect to a grinding wheel having an arc-shaped grinding surface.

  Specifically, since the rotation axis of the grinding wheel and the rotation axis of the forming tool are substantially orthogonal to each other, the forming tool is moved by 90 ° forward and backward with respect to the apex of the arc-shaped grinding surface of the grinding wheel Then, at the position rotated by 90 °, the rotation axis of the grinding wheel and the rotation axis of the forming tool are aligned in parallel.

  That is, even if the forming operation is performed from end to end along the arc-shaped grinding surface of the grinding wheel, the rotation axis of the grinding wheel and the rotation axis of the forming tool do not intersect with each other. Therefore, the entire surface of the arc-shaped grinding surface can be formed without interference between the rotation axis of the grinding wheel and the rotation axis of the forming tool.

  Then, since the entire surface of the grinding surface of the grinding wheel can be formed, a general vitrified CBN grinding wheel is used as the grinding wheel on the premise that the molding is performed, not the expensive electrodeposited CBN grinding wheel or the electrodeposited diamond grinding wheel. The cost of the grinding wheel can be reduced.

A second invention is a method of forming a grinding apparatus comprising: a grinding head having a grinding wheel for grinding a work; and a forming portion for forming a grinding surface of the grinding wheel while rotating a forming tool,
The grinding surface of the grinding wheel is formed in an arc shape projecting radially outward when viewed from the direction orthogonal to the rotation axis of the grinding wheel,
The rotation axis of the forming tool extends in a direction substantially orthogonal to the rotation axis of the grinding wheel,
The method further comprises the step of pivotally moving the forming tool along the grinding surface of the grinding wheel.

  In the second invention, the grinding surface of the grinding wheel is formed in an arc shape. The rotation axis of the grinding wheel and the rotation axis of the forming tool are substantially orthogonal to each other. Then, by rotating the forming tool along the arc-shaped grinding surface of the grinding wheel, the entire surface of the arc-shaped grinding surface is formed without interference between the rotation axis of the grinding wheel and the rotation axis of the forming tool. be able to.

  According to the present invention, the entire surface of the grinding surface can be formed with respect to a grinding wheel having an arc-shaped grinding surface.

It is a front view showing the composition of the grinding device concerning this embodiment. It is a top view which shows the structure of a grinding apparatus. FIG. 6 is a plan view when the forming device is moved along the grinding surface of the grinding wheel.

  Hereinafter, embodiments of the present invention will be described based on the drawings. The following description of the preferred embodiments is merely illustrative in nature, and is not intended to limit the present invention, its applications, or its applications.

  As shown in FIGS. 1 and 2, the grinding apparatus 10 forms a plurality of arc-shaped grooves 13 on the inner peripheral surface of a cylindrical workpiece W at intervals in the circumferential direction.

  On a base 11 of the grinding apparatus 10, an X-axis table 14 movable in a horizontal direction (left and right direction in FIG. 1: hereinafter referred to as X-axis direction) is provided. The X-axis table 14 is provided with a workpiece support 15 for supporting a cylindrical workpiece W. A grinding head 20 mounted on a column (not shown) erected from the base 11 is disposed above the workpiece support 15. A molding device 30 is provided on the side of the work support 15. At the lower part of the forming device 30, a turning and moving device 35 is provided. The turning and moving device 35 is mounted on the X-axis table 14.

  The grinding apparatus 10 includes a controller 12 having a CPU or the like as a component. The grinding operation of the work W by the grinding head 20 and the forming operation of the grinding wheel 22 by the forming apparatus 30 are totally controlled by the controller 12. It has become so.

  The work support 15 has a work table 16 having a chuck mechanism, and a drive mechanism 17 that rotationally drives the work table 16 around a C axis extending in the vertical direction. Although not shown, the drive mechanism 17 is constituted by a drive shaft in the C-axis direction fixed to the work table 16 and a drive source such as an electric motor for rotationally driving the drive shaft via a reduction mechanism. ing.

  The grinding head 20 has a wheel head 21 extending in the vertical direction (hereinafter referred to as the Z-axis direction) and a grinding wheel 22 rotatably supported at the lower end of the wheel head 21.

  The wheel head 21 is formed in a D-shaped cross section in which a part of a circular member in a plan view is cut. The cut portion is provided on the side facing the forming device 30 so as to avoid interference with the forming tool 32 which has been moved by the turning and moving device 35 described later.

  The column is provided with a Z-axis table 25 movable in the Z-axis direction. The grinding head 20 is mounted on the Z-axis table 25. Thereby, the grinding head 20 is movable in the Z-axis direction.

  The grinding wheel 22 is formed of a disk-shaped member, and can be rotated by a drive motor (not shown) around a rotation axis J extending in the horizontal direction (the depth direction in FIG. 1). The grinding wheel 22 is made of, for example, a vitrified CBN grinding wheel.

  Here, the grinding surface 23 of the grinding wheel 22 is formed in an arc shape projecting radially outward as viewed from the direction orthogonal to the rotation axis J (see FIG. 2). Thereby, the grinding surface 23 of the outer periphery of the grinding wheel 22 is cut into the inner surface of the cylindrical workpiece W while rotating the grinding wheel 22 about the rotation axis J, whereby the inner surface of the workpiece W is axially As seen from the above, it is possible to form an arc-shaped groove 13.

  Then, after the groove 13 is formed on the inner surface of the workpiece W, the grinding wheel 22 is temporarily retracted, and the workpiece support 15 is rotated about the C axis by a predetermined angle, and the cutting operation by the grinding wheel 22 is performed again. . By repeating such a grinding operation, a plurality of arc-shaped grooves 13 are formed on the inner surface of the work W at intervals in the circumferential direction.

  The forming apparatus 30 performs forming operations such as truing and dressing on the grinding surface 23 of the grinding wheel 22, and includes a forming head 31, a forming tool 32 attached to the tip of the forming head 31, and a forming tool And 32 a drive motor 33 for rotationally driving about a rotation axis A extending in the X-axis direction.

  The forming tool 32 is configured in a cup shape whose distal end side is open. A forming diamond 34 is provided on the outer peripheral portion of the tip surface of the forming tool 32. The forming head 31 is inclined obliquely downward toward the grinding head 20 side.

  Thereby, when forming the grinding surface 23 of the grinding wheel 22 with the forming tool 32, the grinding surface 23 of the grinding wheel 22 is formed in contact with the forming diamond 34 at a position on the upper side of the forming tool 32 .

  The contact state between the grinding surface 23 of the grinding wheel 22 and the forming diamond 34 is detected by an AE sensor (Acoustic Emission), a contact detection sensor or the like (not shown). The controller 12 adjusts the positions of the grinding head 20 and the forming device 30 based on the detection result of the AE sensor or the like. The positions of the grinding head 20 and the forming device 30 are adjusted based on the detection result of the AE sensor or the like while the turning movement of the forming tool 32 described later is performed.

  The rotation axis J of the grinding wheel 22 of the grinding head 20 and the rotation axis A of the forming tool 32 of the forming apparatus 30 extend in directions substantially orthogonal to each other (see FIG. 2).

  The turning and moving device 35 has a turning table 36 on which the forming device 30 is mounted, and a drive mechanism 37 for rotationally driving the turning table 36 about a B axis extending in the vertical direction. The drive mechanism 37 is not shown, but comprises a drive shaft in the B-axis direction fixed to the swivel table 36 and a drive source such as an electric motor for rotationally driving the drive shaft via a reduction mechanism. ing.

  By the way, since the grinding surface 23 of the grinding wheel 22 is formed in an arc shape projecting outward in the radial direction in plan view, when the molding operation is performed by the molding device 30, the grinding surface 23 of the grinding wheel 22 is It is necessary to pivot the forming tool 32 along.

  As shown in FIG. 3, in a state where the forming diamond 34 of the forming tool 32 is in contact with the apex of the arc-shaped grinding surface 23 of the grinding wheel 22, the rotation axis J of the grinding wheel 22 and the forming tool 32 The rotation axis A is substantially orthogonal to each other.

  Then, as shown by imaginary lines in FIG. 3, when the forming tool 32 is turned by 90 ° back and forth with respect to the B axis with the apex of the grinding surface 23 of the grinding wheel 22 as a base point, At the position rotated by 90 °, the rotation axis J of the grinding wheel 22 and the rotation axis A of the forming tool 32 are arranged in parallel.

  That is, even if the forming operation is performed from end to end along the arc-shaped grinding surface 23 of the grinding wheel 22, that the rotation axis J of the grinding wheel 22 and the rotation axis A of the forming tool 32 intersect Absent. Therefore, the entire surface of the arc-shaped grinding surface 23 of the grinding wheel 22 can be formed without interference between the rotation axis J of the grinding wheel 22 and the rotation axis A of the forming tool 32.

<< Other Embodiments >>
The above embodiment may be configured as follows.

  In the present embodiment, the arc-shaped groove 13 is formed on the inner surface of the cylindrical work W by using the grinding wheel 22 having the arc-shaped grinding surface 23; The arc-shaped groove 13 may be formed on the outer surface of the work W by cutting the grinding surface 23 of 22.

  As described above, the present invention is extremely useful and industrially applicable to a grinding wheel having a circular arc-shaped grinding surface, since a highly practical effect of being able to form the entire surface of the grinding surface is obtained. The availability of is high.

DESCRIPTION OF SYMBOLS 10 Grinding apparatus 15 Workpiece support 20 Grinding head 22 Grinding wheel 23 Grinding surface 30 Forming apparatus (forming part)
32 forming tool 35 turning movement device (turning movement unit)
A rotation axis J rotation axis W work

Claims (2)

A grinding apparatus comprising: a work support base for supporting a work; a grinding head having a grinding wheel for grinding the work; and a forming unit for forming a grinding surface of the grinding wheel while rotating a forming tool,
The grinding surface of the grinding wheel is formed in an arc shape projecting radially outward when viewed from the direction orthogonal to the rotation axis of the grinding wheel,
The rotation axis of the forming tool extends in a direction substantially orthogonal to the rotation axis of the grinding wheel,
A grinding apparatus comprising: a turning movement unit for turning the forming tool along a grinding surface of the grinding wheel. A forming method of a grinding apparatus comprising: a grinding head having a grinding wheel for grinding a workpiece; and a forming portion for forming a grinding surface of the grinding wheel while rotating a forming tool,
The grinding surface of the grinding wheel is formed in an arc shape projecting radially outward when viewed from the direction orthogonal to the rotation axis of the grinding wheel,
The rotation axis of the forming tool extends in a direction substantially orthogonal to the rotation axis of the grinding wheel,
A method of forming a grinding apparatus, comprising the step of pivoting the forming tool along the grinding surface of the grinding wheel.

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