Honing method and honing machine

Abstract

A honing processing technology for making uniform the load applied to honing grindstones by cooperating the reciprocal motion of the honing grindstones with the feeding and expanding motion at high precision by a specified relation. Servo motors are used as drive sources respectively for spindle reciprocal drive part and grindstone depth cutting part, and these two servo motors are mutually cooperated, and the feeding and expanding motion of the honing grindstones is controlled to be synchronized and tuned with the ascending and descending (reciprocal) motion of the honing tool so that the processing load applied to the honing grindstones may be averaged. Hence, without modifying the basis existing mechanical elements, the load applied to the honing grindstones may be averaged, and the honing process may be stabilized in precision and enhanced in precision.

1 . A honing method of honing the inner circumference of a work by moving a honing tool having a honing grindstone reciprocally in the axial direction of the inner circumference of the work, rotating about the axial line, and feeding and expanding the honing grindstone at a specific depth of cut by mechanical driving means,
 wherein a spindle reciprocal driving servo motor and a depth setting driving servo motor are used respectively as a spindle reciprocal driving source for moving a rotational spindle having the honing tool reciprocally in the axial direction of the inner circumference of the work, and a depth cutting driving source for feeding and expanding the honing grindstone, and   the motions of the two servo motors are mutually cooperated, so that the feeding and expanding motion of the honing grindstone is controlled to be synchronized and tuned with the reciprocal motion of the honing tool in order that the processing load applied to the honing grindstone may be made uniform.   
   
   
       2 . The honing method according to  claim 1 ,
 wherein the position waveform in feeding and expanding motion of the honing grindstone is controlled to be synchronized and tuned with the position waveform in ascending and descending stroke motion of the honing tool.   
   
   
       3 . The honing method according to  claim 2 ,
 wherein the control configuration for synchronizing and tuning the feeding and expanding motion with the reciprocal motion is controlled to form preliminarily a position waveform in ascending descending stroke motion of the honing tool and a position waveform in feeding and expanding motion of the honing grindstone, to synchronize and tune the position waveform in the feeding and expanding motion with the position waveform in the ascending and descending stroke motion, and to control the spindle reciprocal driving servo motor and the depth setting driving servo motor to operate respectively at the position waveform in the ascending and descending stroke motion and the position waveform in the feeding and expanding motion of the honing grindstone.   
   
   
       4 . The honing method according to  claim 3 ,
 wherein the operation to synchronize and tune the position waveform in the feeding and expanding motion with the position waveform in the ascending and descending stroke motion is executed by mutually matching the start point and end point in time in these both position waveforms, and mutually matching the position change rates in these both position waveforms.   
   
   
       5 . The honing method according to  claim 2 ,
 wherein the position waveform in ascending and descending stroke motion of the honing tool is a sinusoidal waveform.   
   
   
       6 . The honing method according to  claim 2 ,
 wherein the position waveform in ascending and descending stroke motion of the honing tool is a triangular waveform.   
   
   
       7 . The honing method according to  claim 2 ,
 wherein the feeding and expanding amount of the honing grindstone is an expansion by a specific amount per stroke in the ascending and descending stroke of the honing tool.   
   
   
       8 . A honing machine for moving a honing tool having a honing grindstone reciprocally in the axial direction of the inner circumference of a work, rotating about the axial line, and honing the inner circumference of the work by the honing grindstone, comprising:
 a rotational spindle supported to be movable reciprocally in the axial direction of the inner circumference of the work, and to be rotatable about the axial line,   spindle rotating means for rotating and driving the rotational spindle about the axial line,   spindle reciprocating means for moving the rotational spindle reciprocally in the axial direction of the inner circumference,   a honing tool mounted on the leading end of the rotational spindle, being provided with an expandable and contractable honing grindstone having a wheel surface along the inner circumference,   grindstone depth cutting means for feeding and expanding the honing grindstone of the honing tool with a specified depth of cut, and   control means for controlling automatically by mutually cooperating with the spindle rotating means, spindle reciprocating means, and grindstone depth cutting means,   wherein drive sources of the spindle reciprocating means and the grindstone depth cutting means are realized respectively by a spindle reciprocal driving servo motor and a depth setting servo motor, and   the control means mutually cooperates the motions of these two servo motors, so that the feeding and expanding motion of the honing grindstone is controlled to be synchronized and tuned with the reciprocal motion of the honing tool in order that the processing load applied to the honing grindstone may be made uniform.   
   
   
       9 . The honing machine according to  claim 8 ,
 wherein the control means is designed to control position waveform in feeding and expanding motion of the honing grindstone so as to be synchronized and tuned with the position waveform in ascending and descending stroke motion of the honing tool.   
   
   
       10 . The honing machine according to  claim 9 ,
 wherein the control configuration in the control means for synchronizing and tuning the feeding and expanding motion with the reciprocal motion is controlled to form preliminarily a position waveform in ascending descending stroke motion of the honing tool and a position waveform in feeding and expanding motion of the honing grindstone, to synchronize and tune the position waveform in the feeding and expanding motion with the position waveform in the ascending and descending stroke motion, and to control the spindle reciprocal driving servo motor and the depth setting driving servo motor to operate respectively at the position waveform in the ascending and descending stroke motion and the position waveform in the feeding and expanding motion of the honing grindstone.   
   
   
       11 . The honing machine according to  claim 10 ,
 wherein the operation in the control means to synchronize and tune the position waveform in the feeding and expanding motion with the position waveform in the ascending and descending stroke motion is executed by mutually matching the start point and end point in time in these both position waveforms, and mutually matching the position change rates in these both position waveforms.   
   
   
       12 . The honing machine according to  claim 9 ,
 wherein the position waveform in ascending and descending stroke motion of the honing tool is a sinusoidal waveform.   
   
   
       13 . The honing machine according to  claim 9 ,
 wherein the position waveform in ascending and descending stroke motion of the honing tool is a triangular waveform.   
   
   
       14 . The honing machine according to  claim 9 ,
 wherein feeding and expanding amount of the honing grindstone is an expansion by a specific amount per stroke in the ascending and descending stroke of the honing tool.