Process and device for detecting and compensating for jointing and wear errors in fine drilling
First Claim
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1. A detection and compensation process for jointing and wear errors in the fine drilling of workpieces, comprising the steps of:
- clamping an adjusting tool supporting a radially adjustable cutting insert to a rotatable machine shaft, measuring a diameter of the circle of travel of a radially outer cutting edge of the cutting insert with the machine shaft rotating, and evaluating the measured diameter within the adjusting tool for adjustment purposes before a drilling process is executed with the adjusting tool, and the diameter of the circle of travel measuring step includes (1) positioning tangents at two diametrically opposite positions on the circle of travel of the cutting edge, (2) setting the tangents at a distance in relation to each other or to fixed zero positions, and (3) measuring the distance between the tangents, wherein the positions of the tangents are found by measuring relative displacement of two parallel contact surfaces diametrically opposite to each other in relation to the axis of the machine shaft, moving the contact surfaces transversely to the axis by the action of the rotating cutting edge, and rotating the adjusting tool past the contact surfaces counter to the cutting direction of the cutting insert.
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Abstract
The invention relates to a process and device for detecting and/or compensating for static jointing and wear errors in the fine drilling of workpieces by means of an adjusting tool (18) bearing an adjustable cutting insert (28) and capable of being clamped to a machine shaft (14). According to the invention, before a drilling or a series thereof is made, the diameter of the circle of travel of a radially outer cutting edge (44) of the cutting insert (28) is measured on the clamped adjusting tool with the machine shaft (14) rotating and evaluated within the adjusting tool (18) for adjustment purposes.
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Citations
17 Claims
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1. A detection and compensation process for jointing and wear errors in the fine drilling of workpieces, comprising the steps of:
- clamping an adjusting tool supporting a radially adjustable cutting insert to a rotatable machine shaft, measuring a diameter of the circle of travel of a radially outer cutting edge of the cutting insert with the machine shaft rotating, and evaluating the measured diameter within the adjusting tool for adjustment purposes before a drilling process is executed with the adjusting tool, and the diameter of the circle of travel measuring step includes (1) positioning tangents at two diametrically opposite positions on the circle of travel of the cutting edge, (2) setting the tangents at a distance in relation to each other or to fixed zero positions, and (3) measuring the distance between the tangents, wherein the positions of the tangents are found by measuring relative displacement of two parallel contact surfaces diametrically opposite to each other in relation to the axis of the machine shaft, moving the contact surfaces transversely to the axis by the action of the rotating cutting edge, and rotating the adjusting tool past the contact surfaces counter to the cutting direction of the cutting insert.
- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 16)
- 10. A device for determining and compensating for statistical jointing and wear errors in fine drilling comprising, a frame, an adjustment tool clamped on a rotatable machine shaft, a radially adjustable cutting insert mounted on the adjustment tool and having a radially outer cutting edge, and a measurement apparatus fixed to the frame adjacent an operating area of the adjusting tool for determining a diameter of the circle of travel of the radially outer cutting edge when rotating the machine shaft, wherein the measuring apparatus has two parallel sensors which respectively have contact surfaces facing each other, a slide slidably fixed to the frame and supporting the contact surfaces for limited movement, a reverse spring connected to the slide for urging the slide to an initial position, a path-measuring system connected to the parallel sensors for determining the path of displacement, and the sensors defining a clear space therebetween for receiving a part of the adjusting tool which supports the cutting insert, the contact surfaces being parallel to the axis of the shaft, and the adjusting tool in the clear space being rotated around an axis of the shaft in a direction opposite to the cutting direction.
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17. In a machining device having a rotatable drive shaft and a frame, the shaft being rotatable in a first cutting direction and in a second noncutting direction, an adjustment tool clamped on the shaft, a cutting device supported by the adjustment tool, the cutting device being radially positioned by the adjustment tool and having a radially outward cutting edge for machining a workpiece, a cutting edge position determining device comprising:
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a support movably mounted on the frame, first and second parallel sensors mounted on the support, the first and second sensors respectively having contact surfaces spaced apart for receiving the cutting device therebetween, the first and second sensors producing position signals in response to contact by the cutting edge onto the contact surfaces with the shaft rotating in the noncutting direction, and a measuring system connected to the first and second sensors for receiving the position signals, the measuring system having means for comparing the position signals to a desired position of the cutting edge, and the measuring system being connected to the adjustment tool to control adjustment of position of the cutting edge in response to the means for comparing.
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Specification