SMART CUTTING TOOL SYSTEM FOR USE IN PRECISION CUTTING

Abstract

A smart cutting tool system for use in precision cutting, comprising a cutting insert (1), an upper cutter arbor (2), a lower cutter arbor (3), a first pressure sensor (4), a second pressure sensor (5), a signal processing module (6), a Bluetooth transmission module (7), and a power supply (8), wherein the cutting insert (1) is fixed to a front end of the upper cutter arbor (2), the cutting insert (1) is provided at its rear end with a microgroove, in which the first pressure sensor (4) and the second pressure sensor (5) are inserted. The cutting tool system solves the problem of mutual coupling of various cutting forces, and has higher sensitivity.

Claims

1. A smart cutting tool system for use in precision cutting, characterized in that: it comprises a cutting insert, an upper cutter arbor, a lower cutter arbor, a first pressure sensor, a second pressure sensor, a signal processing module, a Bluetooth transmission module, and a power supply, wherein the signal processing module, the Bluetooth transmission module, and the power supply are sequentially connected by a wire and fixed to a rear end of the lower cutter arbor, and the power supply supplies power for all devices; wherein the cutting insert is fixed to a front end of the upper cutter arbor by means of a threaded fastener, and a tool tip of the cutting insert lies on a center line of a cross section of a main body of the upper cutter arbor; the cutting insert is provided at its rear end with a microgroove, in which the first pressure sensor is inserted vertically, the threaded bolt is preloaded outside the microgroove in such a manner that the first pressure sensor and the upper cutter arbor can be sufficiently contacted with each other, the microgroove is positioned on a left side of the upper cutter arbor, and when the cutting insert is subjected to a radial force in a horizontal direction, the first pressure sensor is in compression in a stress state to measure the radial force in the horizontal direction; the second pressure sensor is horizontally inserted in a connection gap between the upper cutter arbor and lower cutter arbor, and is fixed by a compressive stress of the upper cutter arbor and the lower cutter arbor which are fastened and connected, so as to measure a main cutting force in the vertical direction; and the first pressure sensor and the second pressure sensor are respectively electrically connected with the signal processing module, the first pressure sensor and the second pressure sensor are used for collecting and processing signals, and real-time state sensing signals of two direction cutting forces of the cutting tool can be transmitted to a machine tool numerical control system by means of the Bluetooth transmission module.

2. The smart cutting tool system for use in precision cutting according to claim 1, characterized in that: the upper cutter arbor and the lower cutter arbor are fastened and connected by four threaded fasteners.

3. The smart cutting tool system for use in precision cutting according to claim 1, characterized in that: the lower cutter arbor is arranged at its center line with a wire slot for a wire, the wire slot leads to a rear of the cutter arbor, the upper cutter arbor and the lower cutter arbor are fastened and connected, and the wire slot is closed by a lower surface of the upper cutter arbor.

4. The smart cutting tool system for use in precision cutting according to claim 1, characterized in that: the cutting insert is a polycrystalline diamond insert.

5. The smart cutting tool system for use in precision cutting according to claim 1, characterized in that: the upper cutter arbor and the lower cutter arbor are made of 40Cr material.

6. The smart cutting tool system for use in precision cutting according to claim 1, characterized in that: the first pressure sensor and the second pressure sensor are PZT-5H type piezoelectric sensors.

7. The smart cutting tool system for use in precision cutting according to claim 2, characterized in that: the cutting insert is a polycrystalline diamond insert.

8. The smart cutting tool system for use in precision cutting according to claim 3, characterized in that: the cutting insert is a polycrystalline diamond insert.

9. The smart cutting tool system for use in precision cutting according to claim 2, characterized in that: the upper cutter arbor and the lower cutter arbor are made of 40Cr material.

10. The smart cutting tool system for use in precision cutting according to claim 3, characterized in that: the upper cutter arbor and the lower cutter arbor are made of 40Cr material.

11. The smart cutting tool system for use in precision cutting according to claim 2, characterized in that: the first pressure sensor and the second pressure sensor are PZT-5H type piezoelectric sensors.

12. The smart cutting tool system for use in precision cutting according to claim 3, characterized in that: the first pressure sensor and the second pressure sensor are PZT-5H type piezoelectric sensors.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to describe embodiments of the invention or existing technical solutions more clearly, the drawings for the embodiments or existing technical solutions are briefly illustrated below. It is apparent that those described are merely some embodiments of the invention, and others can be derived by those skilled in the art without an inventive step.

[0027] FIG. 1 is a front view of a smart cutting tool system for use in precision cutting according to the invention;

[0028] FIG. 2 is a lateral view of a smart cutting tool system for use in precision cutting according to the invention;

[0029] In the drawings, 1. cutting insert; 2. upper cutter arbor; 3. lower cutter arbor; 4. first pressure sensor; 5. second pressure sensor; 6. signal processing module; 7. Bluetooth transmission module; 8. power supply; 9. wire; 10. wire slot; 11. threaded fastener.

DETAILED DESCRIPTION OF ILLUSTRATED EMBODIMENTS

[0030] In order to further clarify the purpose, solutions, and advantages of embodiments of the present invention, the embodiments of the present invention will be clearly described below in detail in conjunction with drawings of embodiments. It is clear that the described embodiments are only a part of embodiments of the present invention, not all embodiments of the present invention.

[0031] It should be understood that, as used herein, terms such as upper and lower for indicating orientation or position relationships are described referring to the orientation or position relationships in the drawings for convenience of description of the present invention, but are not intended to mean or hint that the described device or element must be arranged at a specific position or operated by a specific method at a specific position to limit the invention in any way. Furthermore, terms such as first, second and third are merely illustrative, but are not intended to mean or suggest relative importance, nor hint the numbers of the parts.

[0032] FIG. 1 is a front view of a smart cutting tool system for use in precision cutting according to the present invention; FIG. 2 is a lateral view of a smart cutting tool system for use in precision cutting according to the present invention. Referring to FIGS. 1-2, a smart cutting tool system for use in precision cutting according to the present invention comprises a cutting insert 1, an upper cutter arbor 2, a lower cutter arbor 3, a first pressure sensor 4, a second pressure sensor 5, a signal processing module 6, a Bluetooth transmission module 7, and a power supply 8, wherein the signal processing module 5, the Bluetooth transmission module 6, and the power supply 7 are connected in this order by wires and fixed to a rear end of the lower cutter arbor 3, and the power supply 8 supplies power for all devices.

[0033] Herein, the cutting insert 1 is fixed to a front end of the upper cutter arbor 2 by means of a threaded fastener, and a tool tip of the cutting insert 1 lies on a center line of a cross section of a main body of the upper cutter arbor 2.

[0034] The cutting insert 1 is provided at its rear end with a microgroove, in which the first pressure sensor 4 is inserted vertically. The threaded bolt is preloaded outside the microgroove, in such a manner that the first pressure sensor 4 and the upper cutter arbor 2 can be sufficiently contacted with each other. The microgroove is positioned on the left side of the upper cutter arbor 2. When the cutting insert 1 is subjected to a radial force in a horizontal direction, the first pressure sensor is in compression in a stress state to measure the radial force in the horizontal direction.

[0035] The second pressure sensor 5 is horizontally inserted in a gap between the upper cutter arbor 2 and the lower cutter arbor 3 which are connected, and is fixed by a compressive stress of the upper cutter arbor 2 and the lower cutter arbor 3 which are fastened and connected, so as to measure a main cutting force in the vertical direction.

[0036] The first pressure sensor 4 and the second pressure sensor 5 are respectively electrically connected with the signal processing module 6. The first pressure sensor 4 and the second pressure sensor 5 are used for collecting and processing signals. By means of the Bluetooth transmission module 7, real-time state sensing signals of two direction cutting forces of the cutting tool can be transmitted to the machine tool numerical control system.

[0037] The upper cutter arbor 2 and the lower cutter arbor 3 are fastened and connected by four threaded fasteners 11.

[0038] The lower cutter arbor 3 is arranged at its center line with a wire slot 10 for wires, the wire slot 10 leads to the rear of the cutter arbor, the upper cutter arbor 2 and the lower cutter arbor 3 are fastened and connected, and the wire slot 10 is closed by the lower surface of the upper cutter arbor 2.

[0039] The cutting insert 1 is a polycrystalline diamond insert.

[0040] The upper cutter arbor and the lower cutter arbor are made of 40Cr materials.

[0041] The first pressure sensor and the second pressure sensor are PZT-5H type piezoelectric sensors. The pressure sensors of the invention may also be capacitive sensors or resistance sensors.

[0042] In another embodiment of the invention, a piezoelectric film is used instead of pressure sensors. In such case, main force goes to the tool tip of the cutting insert. By means of an algorithm, the radial force in the horizontal direction can be measured and calculated from the measured voltage measured by the piezoelectric film. The main cutting force in the vertical direction can be measured from the measured voltage measured by the piezoelectric film in another direction. The piezoelectric film is pre-stressed by a screw. The collected signals are transmitted to the signal processing module by the wire disposed within the cutting tool, and then transmitted to the acquisition end by means of the Bluetooth transmission module. The signal processing module is disposed on the tool shank, signal transmission function is integrated to the cutting tool, such that smart cutting tool is realized.

[0043] The signal processing module and Bluetooth transmission module used in the invention are common devices in the art, and those skilled in the art could select applicable signal processing modules and Bluetooth transmission modules as needed.

[0044] The physical structure of the invention is simulated by FEA, optimized and tested in terms of stiffness and natural frequency, to ensure that the precision requirement for lathe machining can be met even when the lathe rotates at a speed of 6000-8000 rpm or more.

[0045] The present invention is intended to cover all embodiments, even derived from the embodiments disclosed herein without an inventive step. Although the present invention has been illustrated and described with reference to preferred embodiments, the intention is not to limit the present invention. Those skilled in the art may change or modify the embodiments without departing from the scope of the present invention.