JP5085941B2 - Cylindrical grinding machine and external grinding method using cylindrical grinding machine - Google Patents

Description

  The present invention relates to a cylindrical grinder and an outer surface grinding method using a cylindrical grinder.

  A cylindrical grinder moves the shaft head, which rotates and supports a disk-shaped grindstone, relative to the work supported by the headstock in the axial direction and the radial direction, so that the peripheral surface, end face, etc. of the work In recent years, the shaft head that supports the grindstone is often relatively moved in the axial direction and the radial direction of the workpiece by numerical control by a CNC device. Usually, the peripheral surface and the end surface of the workpiece are ground by exchanging them with different grindstones or attaching the workpiece to another grinder.

  In such a cylindrical grinder, in order to improve the efficiency of the grinding operation, the rotation axis of the head supporting the grindstone can be rotated relative to the work, and the rotation axis of the headstock supporting the work is supported. The outer surface including the peripheral surface and the end surface of the workpiece can be ground with one grindstone of the same grinding machine (for example, see Patent Document 1). In what is described in Patent Document 1, the cross-sectional shape of the outer peripheral surface of the grindstone is a polygonal shape composed of a plurality of tapered surfaces with appropriate angles, and according to the inclination angle of the outer surface to be ground such as the peripheral surface and end surface of the workpiece. The axis of rotation of the shaft head is inclined, and the outer surface of the workpiece is ground by one of these tapered surfaces.

JP 2003-291062 A

  The cylindrical grinder described in Patent Document 1 can grind the outer surface including the peripheral surface and the end surface of the workpiece with one grindstone of the same grinder, but the shaft head that supports the grindstone is relative to the axial direction and the radial direction of the workpiece. Since the shaft head needs to be rotatable relative to the workpiece, the relative movement mechanism of the shaft head is complicated. In addition, one of the plurality of tapered surfaces that form the outer peripheral surface of the grindstone needs to be parallel to the inclination angle of the outer surface of the workpiece to be ground. Adjustment also takes time.

  Accordingly, an object of the present invention is to enable easy grinding of an outer surface including a peripheral surface and an end surface of a workpiece with one grindstone without complicating a relative movement mechanism of a shaft head that supports the grindstone.

  In order to solve the above-described problems, a cylindrical grinding machine of the present invention includes a headstock that supports and rotates a workpiece, and a head that rotates and supports a grindstone, and is supported by the headstock. In a cylindrical grinding machine that grinds the outer surface of the workpiece by moving the shaft head relative to the workpiece in the axial direction and the radial direction of the workpiece, the grindstone is used as a CBN grindstone, and the grindstone is supported. A configuration was adopted in which the rotational axis of the shaft head was inclined obliquely with respect to the rotational axis of the headstock supporting the workpiece, and the cross-sectional shape of the outer peripheral surface of the grindstone was R-shaped.

  Further, in the outer surface grinding method using the cylindrical grinder according to the present invention, the workpiece is supported on the spindle head of the rotationally driven cylindrical grinder, and the shaft head that is rotationally driven by supporting the grindstone is divided into the axial direction and the radial direction of the workpiece. In the outer surface grinding method using a cylindrical grinder that grinds the outer surface of the workpiece by moving the wheel relative to each other, the grindstone is a CBN grindstone, the cross-sectional shape of the outer peripheral surface is an R shape, and the shaft head supports the grindstone A method was adopted in which the rotation axis of the was inclined obliquely with respect to the rotation axis of the headstock supporting the workpiece.

  That is, the grindstone is a CBN grindstone with very little wear, and the rotational axis of the head that supports the grindstone is inclined obliquely with respect to the rotational axis of the headstock that supports the workpiece, so that the cross-sectional shape of the outer peripheral surface of the grindstone is By adopting the R shape, the outer peripheral surface of the grindstone is ground at any point of the R shape by making point contact with the outer surface such as the peripheral surface or end surface of the workpiece having an arbitrary inclination angle, and by this point contact By suppressing the wear of the grinding wheel to be ground, the outer surface including the peripheral surface and the end surface of the workpiece can be easily ground with a single grinding stone without complicating the relative movement mechanism of the shaft head that supports the grinding wheel.

  The cylindrical grinding machine and the external grinding method using the cylindrical grinding machine according to the present invention are such that the grindstone is a CBN grindstone with very little wear, and the rotation axis of the head that supports the grindstone is set to the rotation axis of the headstock that supports the workpiece. The outer peripheral surface of the grindstone is formed in an R shape so that the outer peripheral surface of the grindstone is an outer surface such as a peripheral surface or an end surface of a workpiece having an arbitrary inclination angle at any point of the R shape. The surface of the workpiece and the end surface of the workpiece are made without complicating the relative movement mechanism of the shaft head that supports the wheel. Can be easily ground with one grindstone.

  Also, if this cylindrical grinder moves the shaft head that supports the grindstone relative to the workpiece in the axial direction and radial direction by numerical control by the CNC device, the wear of the CBN grindstone is very small. By using the post gauge of the workpiece after finishing the grinding or before finishing the machining with the machining allowance, the next workpiece can be driven and ground with high accuracy.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. As shown in FIG. 1, this cylindrical grinding machine includes a headstock 1 and a tailstock 2 that support and rotate a workpiece 10, and a head 4 that supports and rotates a grindstone 3. 1 and the workpiece 10 supported at both ends by the centers 1a and 2a of the tailstock 2 are subjected to numerical control by a CNC device (not shown) so that the shaft head 4 is in the axial direction (X direction) and radial direction of the workpiece 10. It can be moved in the (Z direction). The rotation axis T _A of spindle head 4 is inclined obliquely relative to the axis of rotation W _A of the headstock 1, the grinding wheel 3 is very small CBN wheel wear, cross-sectional shape of the outer peripheral surface 3a Is R-shaped.

  The workpiece 10 is a cylindrical roller as a bearing component, and the grindstone 3 supported by the shaft head 4 is sequentially moved from the position A indicated by the solid line in FIG. 1 to the positions B, C, and D indicated by the one-dot chain line. While the outer peripheral surface 3a of the grindstone 3 is moved and is in point contact with the end surface 10a of the workpiece 10, one shoulder 10b, the outer peripheral surface 10c, and the other shoulder 10d at any point of the R shape, these workpieces 10 outer surfaces are ground.

  In the embodiment described above, the workpiece is a cylindrical roller, but the cylindrical grinding machine according to the present invention can grind the outer surface of a workpiece having an arbitrary shape having a conical surface, a drum surface, a stepped surface, etc. with a single grindstone. it can.

Plan view showing an embodiment of a cylindrical grinding machine

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Main shaft stand 2 Tailstock 1a, 2a Center 3 Grinding wheel 3a Outer peripheral surface 4 Shaft head 10 Work 10a End surface 10b, 10d Shoulder part 10c Outer peripheral surface

Claims (3)

A spindle head that supports and rotates the workpiece, and a spindle head that rotates and supports the grindstone. The workpiece is supported by the spindle table in the axial direction and the radial direction of the workpiece. In a cylindrical grinder that grinds the cylindrical surface that is the outer peripheral surface of the workpiece, the end surface that intersects the axial direction of the cylindrical surface, and the shoulder between the cylindrical surface by moving the grindstone, As a CBN grindstone, the cross-sectional shape of its outer peripheral surface is an R shape, and the rotation axis of the head that supports the grindstone is inclined obliquely with respect to the rotation axis of the headstock that supports the workpiece, and the inclination angle is By moving the grindstone in parallel while being held, the outer peripheral surface of the grindstone includes at least two of the cylindrical surface of the workpiece, the cylindrical surface of both the shoulders, and one end surface at any point of the R shape. Two adjacent faces and order Cylindrical grinding machine, characterized in that so as to grind with point contact. By supporting the work on the spindle head of a rotationally driven cylindrical grinder and moving the shaft head, which is driven to rotate by supporting the grindstone, in the axial and radial directions of the work , In an outer surface grinding method using a cylindrical grinder for grinding a cylindrical surface, an end surface intersecting the axial direction of the cylindrical surface, and a shoulder between the cylindrical surface and the end surface, a cross-section of an outer peripheral surface of the grindstone is a CBN grindstone The shape is an R shape, and the rotation axis of the head supporting the grindstone is inclined obliquely with respect to the rotation axis of the headstock supporting the workpiece, and the grindstone is translated while maintaining the inclination angle. In this way, the outer peripheral surface of the grindstone is in point contact with at least two adjacent surfaces including the cylindrical surface of the workpiece, both the shoulder portions, and the cylindrical surface of the one end surface at any point of the R shape. be ground while Outer surface grinding method according to cylindrical grinding machine, characterized in that. The workpiece is a cylindrical roller of a bearing component, and the grindstone grinds the outer surface of the workpiece while sequentially making point contact with one end surface, one shoulder portion, an outer peripheral surface and the other shoulder portion of the workpiece. An outer surface grinding method using a cylindrical grinder according to claim 2.

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