Method and apparatus for detecting machining flaws, especially caused by grinding machines
OwnerDieter Wolter-Dollinventor
Life of this patent
Estimating the term…
Abstract
A method and an apparatus for detecting machining flaws of machine tools mechanically removing material from surfaces, especially of grinding machines, with the help of which the occurrence of machining flaws can be determined directly during the machining of the workpiece itself. This is achieved as far as the method is concerned in that the force exerted by the tool bit upon the workpiece during the machining process is measured as an “actual or momentary” value. This value is then fed to an electronic data processing unit and is compared there with a “nominal” value stored there and obtained from the processing of an unflawed workpiece, the thus obtained values can be documented and used to identify a flawed product.
Claims8
A method of preventing machining flaws in a tooth wheel, which are caused by a grinding disc which simultaneously grinds two adjacent tooth flanks of adjacent teeth of the tooth wheel, when the grinding disc is applied against the two adjacent tooth flanks with excessive force during grinding, said method comprising the steps of:
- determining nominal grinding forces applied by the grinding disc to a test tooth wheel produced without any machining flaws and storing nominal force values;
- continuously measuring a grinding force which is applied by the grinding disc to the tooth wheel in two axes extending at an angle to each other during regular grinding of the tooth wheel;
- comparing instantaneous measurement value of the grinding force with a corresponding nominal grinding force value;
- and
- changing at least one of feed and rotational speed of the grinding disc in accordance with a comparison value, whereby the grinding force, applied by the grinding disc, is brought in accordance with the corresponding nominal force value;
- wherein said grinding force measuring step comprises measuring displacement of tooth wheel supporting means, which is caused by application of the grinding force to the tooth wheel, with two high-resolution inductive path pick-ups arranged at an angle with respect to each other corresponding to the angle at which the two axes extend to each other.
A method of preventing machining flaws in a tooth wheel, which are caused by a grinding disc which simultaneously grinds two adjacent tooth flanks of adjacent teeth of the tooth wheel, when the grinding disc is applied against the two adjacent tooth flanks with excessive force during grinding, said method comprising the steps of:
- determining nominal grinding forces applied by the grinding disc to a test tooth wheel produced without any machining flaws and storing nominal force values;
- continuously measuring a grinding force which is applied by the grinding disc to the tooth wheel in two axes extending at an angle to each other during regular grinding of the tooth wheel;
- comparing instantaneous measurement value of the grinding force with a corresponding nominal grinding force value;
- and
- changing at least one of feed and rotational speed of the grinding disc in accordance with a comparison value, whereby the grinding force, applied by the grinding disc, is brought in accordance with the corresponding nominal force value;
- wherein said grinding force measuring step comprises measuring a vibration frequency of the grinding disc with two accelerometer pick-ups.
A method of preventing machining flaws in a tooth wheel, which are caused by a grinding disc which simultaneously grinds two adjacent tooth flanks of adjacent teeth of the tooth wheel, when the grinding disc is applied against the two adjacent tooth flanks with excessive force during grinding, said method comprising the steps of:
- determining nominal grinding forces applied by the grinding disc to a test tooth wheel produced without any machining flaws and storing nominal force values;
- continuously measuring a grinding force which is applied by the grinding disc to the tooth wheel in two axes extending at an angle to each other during regular grinding of the tooth wheel;
- comparing instantaneous measurement value of the grinding force with a corresponding nominal grinding force value;
- and
- changing at least one of feed and rotational speed of the grinding disc in accordance with a comparison value, whereby the grinding force, applied by the grinding disc, is brought in accordance with the corresponding nominal force value;
- wherein said grinding force measuring step comprises measuring displacement of tooth wheel supporting means, which is caused by application of the grinding force to the tooth wheel, with two accelerometers pick-ups arranged at an angle with respect to each other corresponding to the angle at which the axes extent to each other.
A method of preventing machining flaws in a tooth wheel, which are caused by a grinding disc which simultaneously grinds two adjacent tooth flanks of adjacent teeth of the tooth wheel, when the grinding disc is applied against the two adjacent tooth flanks with excessive force during grinding, said method comprising the steps of:
- determining nominal grinding forces applied by the grinding disc to a test tooth wheel produced without any machining flaws and storing nominal force values;
- continuously measuring a grinding force which is applied by the grinding disc to the tooth wheel in two axes extending at an angle to each other during regular grinding of the tooth wheel;
- comparing instantaneous measurement value of the grinding force with a corresponding nominal grinding force value;
- and
- changing at least one of feed and rotational speed of the grinding disc in accordance with a comparison value, whereby the grinding force, applied by the grinding disc, is brought in accordance with the corresponding nominal force value;
- printing out measurement values in a form of one of curves and a measured value column.
An apparatus for preventing machining flaws in a tooth wheel which are caused by a grinding disc, which simultaneously grinds two adjacent tooth flanks of adjacent teeth of the tooth wheel, when the grinding disc is applied against the two adjacent tooth flanks with excessive force during grinding, said apparatus comprising:
- means for storing values of nominal grinding forces applied by the grinding disc to a test tooth wheel produced without any machining flaws;
- means for continuously measuring a grinding force, which is applied by the grinding disc to the tooth wheel, in two axes extending at an angle to each other during regular grinding of tooth wheels, said continuously measuring means comprising two pick-ups arranged at an angle to each other corresponding to the angle at which the two axes extend to each other;
- means for comparing an instantaneous measurement value of the grinding force with a corresponding nominal grinding force value;
- and
- means for changing at least one of feed and rotational speed of the grinding disc in accordance with a comparison value, to thereby bring the grinding force, applied by the grinding disc to the tooth wheel in accordance with the corresponding force value,
- wherein said two pick-ups are formed as two high-resolution inductive path pick-ups.
An apparatus for preventing machining flaws in a tooth wheel which are caused by a grinding disc, which simultaneously grinds two adjacent tooth flanks of adjacent teeth of the tooth wheel, when the grinding disc is applied against the two adjacent tooth flanks with excessive force during grinding, said apparatus comprising:
- means for storing values of nominal grinding forces applied by the grinding disc to a test tooth wheel produced without any machining flaws;
- means for continuously measuring a grinding force, which is applied by the grinding disc to the tooth wheel, in two axes extending at an angle to each other during regular grinding of tooth wheels, said continuously measuring means comprising two pick-ups arranged at an angle to each other corresponding to the angle at which the two axes extend to each other;
- means for comparing an instantaneous measurement value of the grinding force with a corresponding nominal grinding force value;
- and
- means for changing at least one of feed and rotational speed of the grinding disc in accordance with a comparison value, to thereby bring the grinding force, applied by the grinding disc to the tooth wheel in accordance with the corresponding force value,
- wherein said grinding force measuring means comprises accelerometer pick-up means for measuring a vibration frequency of the grinding disc.
An apparatus for preventing machining flaws in a tooth wheel which are caused by a grinding disc, which simultaneously grinds two adjacent tooth flanks of adjacent teeth of the tooth wheel, when the grinding disc is applied against the two adjacent tooth flanks with excessive force during grinding, said apparatus comprising:
- means for storing values of nominal grinding forces applied by the grinding disc to a test tooth wheel produced without any machining flaws;
- means for continuously measuring a grinding force, which is applied by the grinding disc to the tooth wheel, in two axes extending at an angle to each other during regular grinding of tooth wheels, said continuously measuring means comprising two pick-ups arranged at an angle to each other corresponding to the angle at which the two axes extend to each other;
- means for comparing an instantaneous measurement value of the grinding force with a corresponding nominal grinding force value;
- and
- means for changing at least one of feed and rotational speed of the grinding disc in accordance with a comparison value, to thereby bring the grinding force, applied by the grinding disc to the tooth wheel in accordance with the corresponding force value,
- wherein said two pick-ups comprises two accelerometer pick-ups for measuring displacement of tooth wheel supporting means, which is caused by application of the grinding force to the tooth wheel.
Dependencies are inferred from the claim text.