CONTROL FOR CUTTING TOOL

• US 3,589,077 A
• Filed: 06/05/1968
• Issued: 06/29/1971
• Est. Priority Date: 06/05/1968
• Status: Expired due to Term

• Current Assignee: Ronald L. Lenning
• Original Assignee: Ronald L. Lenning
• Inventors: Lenning, Ronald L.
• Application Number:
  US04/734,787
• Time in Patent Office: 1,119 Days
• US Class Current: 451/26
• CPC Class Codes: B23Q 15/12 Adaptive control, i.e. adjusting itself to have a performance which is optimum according to a preassigned criterion
• CPC Class Codes: B24B 49/16 taking regard of the load
• CPC Class Codes: G05B 2219/37348 Power, wattmeter voltage times current
• CPC Class Codes: G05B 2219/37543 Set, compare to maximum, peak, minimum value
• CPC Class Codes: G05B 2219/49091 Control feed as function of detected diameter, cross section of workpiece
• CPC Class Codes: G05B 2219/49177 Runout, eccentricity, unbalance of tool or workpiece

Abstract

A grinding wheel has its feedrate controlled in accordance with a force exerted on the grinding wheel when it is in cutting engagement with the workpiece. The force is compared with a reference force, and the difference is utilized to select the feedrate of the grinding wheel into the workpiece. When the workpiece is reduced by the grinding wheel to a predetermined size, the reference force is changed.

Claims

1. A control for a machine having a cutting tool to remove material from a workpiece, said control including:

means to measure a force on the cutting tool due to the cutting tool engaging the workpiece;

reference signal means providing an output;

means to compare an output of said measuring means to an output of said reference signal means, said comparing means providing an output indicative of the difference of the two outputs and which is larger;

said reference signal means has first and second outputs;

means to connect only one of said first and second outputs of said reference signal means to said comparing means;

means to feed one of the cutting tool and the workpiece relative to the other to move the movable one of the cutting tool and the workpiece toward and away from the other; and

means to regulate said feed means to regulate the movement of the movable one of the cutting tool and the workpiece toward and away from the other in accordance with the output of said comparing means.

2. A control for a machine having a cutting tool to remove material from a rotatably driven workpiece, said control including:

means to measure a force on the cutting tool due to the cutting tool engaging the workpiece;

reference signal means providing an output;

means to compare an output of said measuring means to an output of said reference signal means, said comparing means providing an output indicative of tHe difference of the two outputs and which is larger;

means to maintain the output of said measuring means to said comparing means at substantially its maximum value during each revolution of the workpiece when the size of the workpiece exceeds a predetermined size;

means to feed one of the cutting tool and the workpiece relative to the other to move the movable one of the cutting tool and the workpiece toward and away from the other; and

means to regulate said feed means to regulate the movement of the movable one of the cutting tool and the workpiece toward and away from the other in accordance with the output of said comparing means.

3. A control for a machine having a cutting tool to remove material from a workpiece, said control including:

means to measure a force on the cutting tool due to the cutting tool engaging the workpiece;

reference signal means providing an output;

means to compare an output of said measuring means to an output of said reference signal means, said comparing means providing an output indicative of the difference of the two outputs and which is larger;

means to change the output of said reference signal means in accordance with the size of the workpiece;

means to feed one of the cutting tool and the workpiece relative to the other to move the movable one of the cutting tool and the workpiece toward and away from the other; and

means to regulate said feed means to regulate the movement of the movable one of the cutting tool and the workpiece toward and away from the other in accordance with the output of said comparing means.

4. The control according to claim 1 including means to change the position of said connecting means when the workpiece is reduced to a predetermined size.

5. The control according to claim 4 including:

means to maintain the output of said measuring means at substantially its maximum value; and

said changing means rendering said maintaining means ineffective when said changing means changes the position of said connecting means when the workpiece is reduced to the predetermined size.

6. The control according to claim 2 in which said cutting tool is a grinding wheel.

7. The control according to claim 6 in which:

means rotates said grinding wheel; and

said measuring means measures the power supplied to said rotating means.