SU761879A1 - Apparatus for determining cutting tool wear - Google Patents

Description

The invention relates to a technique for indirect measurement of wear of the cutting tool when machining deep holes.

Closest to the invention to the technical essence and the achieved result is a device for determining the wear of the cutting tool, comprising a housing located on the main holder of the cutting tool and the registration of wear [1].

The disadvantages of this device are the low accuracy and efficiency of determining the wear of the cutting tool when machining deep holes.

The aim of the invention is to improve the accuracy and efficiency of determining wear.

The goal is achieved by the fact that the device is equipped with two inductive sensors, one of which is placed on the holder of the cutting tool, and the second is equipped with a movable anchor and is installed outside the treatment area;

FIG. 1 shows a device for

determine the wear of the cutting tool

boring head when machining deep

2

holes; in fig. 2 - section A — A of FIG. one;

• in FIG. 3 — section B — B of FIG. one; in fig. 4— second sensor removed from the processing zone; in fig. 5 - tracking system for

⁵ wear measurements.

The device includes a housing 1, guides .2 located on it and a holder 3 of the cutting tool 4. In the holder 3 under the tool 4 is placed

10, the first inductive sensor consisting of a core 4 and a winding 6. The sensor is placed so that the main cutting edge 7 of the tool 4 protrudes relative to the working end 8 on a level 15 a greater than the expected tool wear 4. The second inductive sensor (Fig. 4 ) is identical to the first, and installed outside the treatment area. It is equipped with a movable anchor 9, located parallel to the end face 10 and made in the form of a massive plank with parallel ends. Anchor 9, which is necessary for static calibration of the second sensor, is installed with a gap “b” in relation to the end face 10.

25 The position of the armature 9 is registered with the indickator 11. The housing 1 is fixed in the stem 12 covered by the workpiece 13. The wear detection unit is designed as a tracking system from the variable amplifier 14

30 current, demodulator 45, filter 16 vys761879

3

frequencies, power amplifier 17, executive motor 18, the shaft of which is connected to an anchor 9. Generator 19 serves to power the inductive sensors and controls the operation of the demodulator 15.

The device works as follows.

Static calibration is performed by bringing the edge of tool 4 to the end of the workpiece 13. If there is an unbalance signal from the bridge formed by windings ί-ι, b ₂ sensors and transformer 20, the tracking system performs it, changing it by the end of 10th anchor The angle of rotation of the engine 18 is zero.

counting.

As the tool 4 wears out, the inductive resistance-ι of the first sensor installed in the holder 3 changes, which leads to an error signal at the input of the amplifier 14. The signal from the latter goes to the demodulator 15, which besides rectifying the signal eliminates the quadrature error of the sensor. Filter 06 cuts off the high-frequency component of the signal and reduces the effect of air bubbles trapped in coolant, random chips, etc.

Reinforced in the amplifier 17, the signal is processed by the engine 18, changing the position of the armature 9 relative to the end 10,

four

which leads to a change in inductance b ₂ . The engine 18 is running until the error signal at the input of the amplifier 14 becomes zero.

The wear of tool 4 is judged by the difference in the angles of rotation of the shaft of the dvdgatel 18 at the starting point and at the point of wear measurement.

Claims (1)

Claim A device for determining the wear of a cutting tool, for example, when machining a workpiece, comprising a housing, a cutting tool holder and a wear detection unit located thereon, characterized in that, in order to improve the accuracy and efficiency of izchos tool detection, it is equipped with two inductive sensors, one of which is placed on the holder of the cutting tool, and the second is equipped with a movable anchor and is installed outside the working area, the wear detection unit is designed as a tracking system, the executive engine which is associated with an anchor.