JP6430217B2 - Profile grinding machine - Google Patents

Description

  The present invention relates to a profile grinder.

  2. Description of the Related Art Conventionally, a workpiece processing apparatus for processing a cylindrical inner surface or end surface of a workpiece into an irregular shape is known (see, for example, Patent Document 1).

  In Patent Document 1, the workpiece is rotated about the axis of the workpiece, and a grindstone having a diameter smaller than the inner diameter of the workpiece is rotated at a predetermined position on the axis of the workpiece. Based on machining shape information indicating a predetermined irregular shape to be machined, it is described that the grindstone is relatively moved in a direction perpendicular to the axial direction of the workpiece to grind the inner surface or end surface of the workpiece into an irregular shape. Yes.

JP 2010-023164 A

  By the way, when profile grinding is performed, the faster the workpiece is rotated, the thinner the chips to be ground by the grindstone. Therefore, the load applied to the grindstone and the workpiece can be reduced, and the appearance of the processed surface is improved.

  However, in the conventional workpiece processing apparatus, the upper limit of the acceleration in the cutting direction is determined according to the performance of the driving device that cuts and feeds the grindstone, so the rotation speed of the workpiece must be reduced in accordance with the acceleration of the grindstone. There was a problem of not becoming.

  This invention is made | formed in view of this point, The objective is to provide the profile grinder which can make the relative acceleration of the cutting direction of a grindstone with respect to the workpiece | work faster.

  The present invention is directed to a profile grinder for grinding a grinding surface of a workpiece into a non-circular shape, and has taken the following solution.

That is, the first invention is a work rotation unit that holds the work and rotates the work around a predetermined rotation axis;
A processing apparatus having a grindstone for grinding the workpiece and a motor for rotating the grindstone;
A grindstone moving unit that performs profile grinding by cutting and feeding the grindstone of the processing apparatus to the grinding surface of the workpiece and reciprocating the grindstone in synchronization with the rotation operation around the rotation axis of the workpiece;
And a workpiece moving unit that moves the workpiece rotating unit so that the relative acceleration in the cutting direction of the grindstone with respect to the workpiece is increased during the profile grinding .

  In the first invention, the grindstone is moved toward the workpiece by the grindstone moving portion, and the workpiece is moved toward the grindstone by the workpiece moving portion. Thereby, the relative acceleration in the cutting direction of the grindstone with respect to the workpiece can be regarded as the sum of the acceleration of the grindstone moving portion and the acceleration of the workpiece moving portion. As a result, the followability of the grindstone to the workpiece is improved, so that the rotation speed of the workpiece rotating portion can be increased, the load applied to the grindstone and the workpiece can be reduced, and the appearance of the processed surface can be improved.

  According to the present invention, the grindstone is moved toward the workpiece by the grindstone moving unit, the workpiece is moved toward the grindstone by the workpiece moving unit, and the relative acceleration in the cutting direction of the grindstone with respect to the workpiece is increased, thereby rotating the workpiece. The rotation speed of the part can be increased.

It is a perspective view which shows the structure of the profile grinder which concerns on this embodiment. It is a top view which shows the positional relationship of a grindstone and a workpiece | work. FIG. 3 is a view corresponding to FIG. 2 when the work is rotated.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. It should be noted that the following description of the preferred embodiment is merely illustrative in nature and is not intended to limit the present invention, its application, or its use.

  As shown in FIG. 1, the profile grinder 10 is a so-called NC machine tool, and can perform grinding automatically by numerical control. In the profile grinder 10, a metal workpiece 11 having a non-round grinding hole 11a formed in the center is a processing target, and the inner peripheral surface of the grinding hole 11a of the workpiece 11 is ground. .

  In the present embodiment, the work 11 is assumed to be a housing, a cam ring, an oil pump, or the like in which a non-round grinding hole 11a is formed, but a cam or the like in which the outer peripheral surface is formed in a non-round shape. It may be.

  The profile grinding machine 10 includes a bed 12 extending in the left-right direction and a column 13 extending in the up-down direction on the back side of the bed 12.

  On the upper surface of the bed 12, a work moving unit 15 that moves the work 11 along the left-right direction (also referred to as a cutting direction) is installed. The workpiece moving unit 15 is rotated with the A-axis ball screw 16 extending along the A-axis parallel to the cutting direction, the A-axis servomotor 17 provided at the right end of the A-axis ball screw 16, and the rotation of the A-axis ball screw 16. And an A-axis table 18 that can move along the horizontal axis A while being positioned with high accuracy.

  A workpiece rotating unit 20 is installed on the A-axis table 18. The work rotation unit 20 includes a chuck 21 and a C-axis servo motor 22. The chuck 21 incorporates an electromagnet (not shown), and the work 11 placed on the upper surface of the chuck 21 is fixed by supplying a current to the electromagnet.

  The chuck 21 is rotatably supported by the A-axis table 18 via a bearing (not shown), and rotates about the C axis as a rotation axis extending in the vertical direction. The C axis is provided so as to intersect the A axis. The chuck 21 is connected to a C-axis servomotor 22 and is driven to rotate by the C-axis servomotor 22.

  A vertical movement unit 25 that moves the grindstone 32 along the vertical direction is installed on the front surface of the column 13. The vertical movement unit 25 is configured to rotate along the Z-axis ball screw 26 extending along the Z-axis parallel to the vertical direction, the Z-axis servomotor 27 provided at the upper end of the Z-axis ball screw 26, and the Z-axis ball screw 26. And a Z-axis table 28 that can move along the Z-axis while being positioned with high accuracy.

  A grindstone moving unit 40 that moves the grindstone 32 of the processing device 30 along the left-right direction (also referred to as a cutting direction) is installed on the front surface of the Z-axis table 28. The grindstone moving unit 40 includes an X-axis ball screw 41 extending along the X-axis parallel to the cutting direction, an X-axis servo motor 42 provided at the right end of the X-axis ball screw 41, and the rotation of the X-axis ball screw 42. And an X-axis table 43 that can move along the X-axis while being positioned with high accuracy.

  The processing device 30 performs a grinding process on the grinding surface of the workpiece 11 supported by the chuck 21 of the workpiece rotating unit 20 (the inner peripheral surface of the grinding hole 11a). The processing device 30 includes a tool shaft 31 extending in the vertical direction, a grindstone 32 attached to a tip end portion of the tool shaft 31, and a tool shaft 31 and a grindstone 32 provided on a base end portion of the tool shaft 31 with a J-axis (axis And a motor 33 that rotates around the center.

  The column 13 is provided with an NC machining control unit 19 related to the drive control described above. The NC machining control unit 19 is configured by software such as a computer and a program installed therein. The motors of the workpiece moving unit 15, the workpiece rotating unit 20, the vertical direction moving unit 25, the processing apparatus 30, and the grindstone moving unit 40 are electrically connected to the NC processing control unit 19, and at the time of grinding, these speeds are used. The NC machining control unit 19 numerically controls the position, operation timing, and the like.

  Hereinafter, a procedure for profile grinding the grinding hole 11a of the workpiece 11 using the profile grinder 10 according to the present embodiment will be described. First, the workpiece moving unit 15 and the grindstone moving unit 40 drive and control the A-axis servomotor 17 and the X-axis servomotor 42, so that the A-axis servomotor 17 and the grindstone 32 overlap with each other in a plan view. The table 18 and the X axis table 43 are moved.

  The vertical movement unit 25 drives and controls the Z-axis servomotor 27 to lower the Z-axis table 28 and place the grindstone 32 in the grinding hole 11 a of the workpiece 11.

  The workpiece rotating unit 20 drives and controls the C-axis servomotor 22 to rotate the workpiece 11 around the C-axis together with the chuck 21.

  Next, the grindstone moving unit 40 drives and controls the X-axis servo motor 42 while the workpiece 11 is rotating around the C axis, thereby cutting and feeding the grindstone 32 to the grinding surface of the workpiece 11 ( (See FIG. 2).

  On the other hand, the work moving unit 15 moves the work 11 toward the grindstone 32 by driving and controlling the A-axis servomotor 17 while the grindstone moving unit 40 cuts and feeds the grindstone 32 to the work 11. Let Thereby, the relative acceleration of the cutting direction with respect to the workpiece | work 11 of the grindstone 32 can be made quick.

  Further, the grindstone moving unit 40 reciprocates the grindstone 32 in the cutting direction in synchronization with the rotation operation around the C axis of the workpiece 11 (see FIG. 3). Accordingly, profile grinding is performed so that the inner peripheral surface of the grinding hole 11a of the workpiece 11 has a preset non-circular shape.

  As described above, according to the profile grinder 10 according to the present embodiment, the relative acceleration in the cutting direction of the grindstone 32 with respect to the workpiece 11 is regarded as the sum of the acceleration of the grindstone moving unit 40 and the acceleration of the workpiece moving unit 15. Can do. As a result, the followability of the grindstone 32 to the workpiece 11 is improved, so that the rotation speed of the workpiece rotating unit 20 can be increased, the load applied to the grindstone 32 and the workpiece 11 is reduced, and the appearance of the processed surface is improved. be able to.

  As described above, the present invention provides a highly practical effect that the relative acceleration in the cutting direction of the grindstone with respect to the workpiece can be increased. Therefore, the present invention is extremely useful and has high industrial applicability.

DESCRIPTION OF SYMBOLS 10 Profile grinder 11 Work 15 Work moving part 20 Work rotating part 30 Processing apparatus 32 Grinding wheel 33 Motor 40 Grinding wheel moving part

Claims (1)

A profile grinder for grinding a workpiece grinding surface into a non-circular shape,
A workpiece rotating unit that holds the workpiece and rotates the workpiece around a predetermined rotation axis;
A processing apparatus having a grindstone for grinding the workpiece and a motor for rotating the grindstone;
A grindstone moving unit that performs profile grinding by cutting and feeding the grindstone of the processing apparatus to the grinding surface of the workpiece and reciprocating the grindstone in synchronization with the rotation operation around the rotation axis of the workpiece;
A profile grinding machine, comprising: a workpiece moving unit that moves the workpiece rotating unit so that a relative acceleration in a cutting direction of the grindstone with respect to the workpiece is accelerated during the profile grinding.

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