A cutting force intelligent sensing tool holder

Abstract

The present invention discloses a cutting force intelligent sensing tool holder, which mainly relates to the technical field of intelligent tool holders. Specifically, the tool holder comprises: a tool holder body and a force measuring tool holder floating frame of the same structure fixedly arranged on both sides of the tool holder body, and six force measuring units with the same structure are arranged inside the tool holder body. The present application integrates the force measuring unit into the tool holder. Compared with integrating the force measuring unit into the tool rod, the force measuring unit has a larger design space, and the six force measuring units with the same structure can better decompose the cutting force into six component forces, including three axial forces along the Cartesian coordinate system and torques around three axes, and more thoroughly decompose the cutting force, which can greatly improve the test accuracy, avoid interference between channels, and greatly improve the accuracy and timeliness of measurement.

Description

[0001] A cutting force intelligent sensing tool holder Technical Field

[0003] The invention belongs to the technical field of intelligent tool holders, and in particular relates to a cutting force intelligent sensing tool holder. Background Art

[0005] High-end manufacturing industry has put forward higher and higher requirements on the speed and precision of cutting processing. Tool wear, chipping, and tool breakage will seriously reduce the processing precision and production efficiency. To ensure this, it is particularly important to monitor the tool status in real time during the cutting process. However, most of the machine tools and other processing equipment do not have the function of tool status monitoring. In order to enable these highly automated processing equipment to achieve high-precision and high-speed processing, it is necessary to study and develop related sensor technologies and equipment that can monitor the processing status.

[0006] Cutting force is the most basic state parameter describing the cutting process and can most accurately reflect the state information of the cutting tool. Real-time measurement of cutting force can provide the necessary basis for identifying the tool state and controlling the workpiece processing quality. There are currently three main principles for cutting force perception, namely piezoelectric, capacitive and strain. The piezoelectric type uses piezoelectric crystals and piezoelectric ceramic materials to convert cutting force into electric charge through the piezoelectric effect for cutting force perception. It has the advantages of high stiffness and good sensitivity, but the material is brittle and is easy to break in the high vibration and high impact environment of mechanical processing. It is also costly, has strict environmental requirements and high maintenance costs, so it is difficult to apply in the field of mechanical manufacturing; the capacitive type realizes cutting force monitoring by converting cutting force into changes in the physical parameters of capacitance, but the background noise generated by this test principle is large and the cutting force resolution is low; the strain type technology is mature, low cost and long life, so it is very suitable for force perception in harsh environments.

[0007] In the prior art, the cutting force sensing element is often combined with the tool rod to measure the cutting force. The tool rod has a small precision operating space, and the data obtained by the cutting force sensing element is neither timely nor accurate. Therefore, how to accurately and timely obtain the cutting force parameter information is undoubtedly an inevitable requirement for cutting process monitoring. Summary of the invention

[0009] The present invention provides a cutting force intelligent sensing tool holder, which is used to solve the problem of how to accurately and timely obtain cutting force parameter information.

[0010] The technical solution of the present invention to solve the above technical problems is as follows:

[0011] A cutting force intelligent sensing tool holder, comprising: a tool holder body and a force measuring tool holder floating frame of the same structure fixedly arranged on both sides of the tool holder body,

[0012] The front and rear ends of the knife seat body are respectively provided with vertical grooves a with the same structure, and side pillars are provided on both sides of the groove a. The surface of the side pillars and the surface of the groove a are both provided with a plurality of mounting holes.

[0013] The left side and the right side of the knife seat body are both provided with two grooves b with the same structure, and the two grooves b are arranged vertically in parallel.

[0014] The upper surface of the knife seat body is provided with an upper fixing frame, and the lower surface is provided with a lower fixing frame. The upper fixing frame and the lower fixing frame are provided correspondingly, and a plurality of through holes distributed in a rectangular shape are provided correspondingly.

[0015] Six force measuring units with the same structure are arranged inside the tool holder body. The six force measuring units are arranged along the edge of the lower fixed frame and are respectively the first force measuring unit, the second force measuring unit, the third force measuring unit, the fourth force measuring unit, the fifth force measuring unit and the sixth force measuring unit.

[0016] The first force measuring unit and the fourth force measuring unit are respectively recessed in the grooves a at the front end and the rear end of the tool holder body, and form a first inner groove and a fourth inner groove respectively.

[0017] The second force measuring unit and the third force measuring unit are concavely arranged in the groove b on the right side of the tool holder body, and the fifth force measuring unit and the sixth force measuring unit are concavely arranged in the groove b on the left side of the tool holder body.

[0018] The force measuring unit comprises a force sensing beam and a strain gauge, a cavity is arranged between the force sensing beam and the lower fixed frame, the upper surface of the force sensing beam does not contact the inner surface of the tool holder body, the lower surface of the force sensing beam is higher than the lower surface of the tool holder body, and the strain gauge is arranged on the surface of the force sensing beam.

[0019] A signal acquisition circuit board is arranged in the first inner groove or the fourth inner groove or the first inner groove and the fourth inner groove, and strain gauges arranged on the surfaces of the first force measuring unit, the second force measuring unit, the third force measuring unit, the fourth force measuring unit, the fifth force measuring unit and the sixth force measuring unit are all electrically connected to the signal acquisition circuit board.

[0020] A plurality of through holes are arranged on the surface of the floating frame of the force measuring tool holder.

[0021] Furthermore, the force sensing beam is a herringbone beam, which includes a first crossbeam and a second crossbeam, and strain gauges are provided on the upper surface, lower surface, left side and right side of the first crossbeam. One end of the first crossbeam is vertically connected to the second crossbeam, and the other end is vertically connected to the lower fixed frame, and both sides of the second crossbeam are respectively connected to the corresponding inner walls of the groove.

[0022] Furthermore, the first crossbeam and the second crossbeam are integrally formed.

[0023] Furthermore, a plurality of countersunk holes a are provided on the surface of the upper fixing frame. The countersunk holes a are provided between the through holes of the upper fixing frame and are distributed in a rectangular shape with the through holes.

[0024] Furthermore, a plurality of countersunk holes b are provided on the bottom surface of the floating frame of the force measuring tool holder, and the countersunk holes b and the through holes on the lower surface of the floating frame of the force measuring tool holder are distributed in a straight line.

[0025] Furthermore, a mounting cover is provided on the surface of the groove a, and the mounting cover is fixedly connected to the knife seat body through a mounting hole.

[0026] The beneficial effects of the present invention are:

[0027] 1. The present application provides a cutting force intelligent sensing tool holder, comprising an intelligent tool holder body and a force measuring tool holder floating frame of the same structure fixedly arranged on both sides of the tool holder body. The present application integrates a force measuring sensing unit into the tool holder. Compared with integrating the force measuring unit into the tool rod, the force measuring unit has a larger design space.

[0028] 2. The force measuring unit in the present application is a herringbone beam. When the force measuring unit is subjected to the force of the main channel, the herringbone beam can convert the force signal into an electrical signal with higher sensitivity than the traditional rectangular cross-section beam. When the force measuring unit is subjected to interference forces from other channels, the herringbone beam can also absorb the interference forces, thereby avoiding the influence of the interference forces on the test accuracy.

[0029] 3. This application integrates six force measuring units into the tool holder, which can better decompose the cutting force into six components, including three axial forces along the Cartesian coordinate system and torques around three axes. It can more thoroughly decompose the cutting force, greatly improve the test accuracy, avoid interference between channels, and greatly improve the accuracy and timeliness of the measurement. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0032] Figure 1 This is a schematic diagram of the overall structure of a cutting force intelligent sensing tool holder of the present invention.

[0033] Figure 2 This is a vertical stereogram of a cutting force intelligent sensing tool holder of the present invention.

[0034] Figure 3 This is an enlarged view of the structure at A in a cutting force intelligent sensing tool holder of the present invention.

[0035] Figure 4 It is a bottom schematic diagram of a cutting force intelligent sensing tool holder of the present invention.

[0036] Reference numerals:

[0037] 1. tool holder body, 11. groove a, 111 side support, 12. groove b, 13. upper fixing frame, 131. countersunk hole a, 14. lower fixing frame, 141. cavity;

[0038] 2. Floating frame of force measuring tool holder, 21. Countersunk hole b;

[0039] 3. First force measuring unit, 4. Second force measuring unit, 5. Third force measuring unit, 6. Fourth force measuring unit, 7. Fifth force measuring unit, 8. Sixth force measuring unit, 9. First crossbeam, 10. Second crossbeam. DETAILED DESCRIPTION

[0041] The following embodiments of the technical solution of the present invention are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and are therefore only used as examples, and cannot be used to limit the protection scope of the present invention.

[0042] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in this application should have the common meanings understood by those skilled in the art to which the invention belongs.

[0043] In the description of the present application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0044] In addition, the terms "first", "second", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. In the description of the present invention, the meaning of "plurality" is more than two, unless otherwise clearly and specifically defined.

[0045] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0046] Embodiment 1:

[0047] like Figure 1-4 As shown, the present application discloses a cutting force intelligent sensing tool holder, comprising: a tool holder body 1 and a force measuring tool holder floating frame 2 of the same structure fixedly arranged on both sides of the tool holder body 1. In the present application, the tool holder body 1 is preferably rectangular, but not limited thereto. The force measuring tool holder floating frame 2 is trapezoidal, and the long side of the trapezoid is fixedly connected to the tool holder body 1. Figure 2 As shown, two through holes are arranged on the surface of the force measuring tool holder floating frame 2. Further, a countersunk hole b21 is arranged on the bottom surface of the force measuring tool holder floating frame 2, and the countersunk hole b21 and the through hole on the bottom surface of the force measuring tool holder floating frame 2 are distributed in a straight line.

[0048] The intelligent sensing tool holder is fixed to the mounting base by bolts, the mounting base is fixed to the turret of the CNC lathe by bolts, the tool rod is clamped on the tool clamping seat, and the tool clamping seat is fixedly connected to the floating frame 2 by bolts. The number of through holes and countersunk holes in this application is not limited to a specific number and can be set according to actual installation conditions.

[0049] like Figure 1As shown, vertical grooves a11 with the same structure are correspondingly provided at the front and rear ends of the tool holder body 1, and side pillars 111 are provided on both sides of the groove a11. The surfaces of the side pillars 111 and the surfaces of the groove a11 are provided with a plurality of mounting holes. Furthermore, a mounting cover is provided on the surface of the groove a11, and the mounting cover is fixedly connected to the tool holder body 1 through the mounting holes. Two grooves b12 with the same structure are provided on the left and right sides of the tool holder body 1, and the two grooves b12 are vertically arranged in parallel.

[0050] like Figure 1 As shown, an upper fixed frame 13 is provided on the upper surface of the knife holder body 1, and a lower fixed frame 14 is provided on the lower surface. The upper fixed frame 13 and the lower fixed frame 14 are provided correspondingly, and four through holes distributed in a rectangular manner are provided correspondingly. Furthermore, two countersunk holes a131 are provided on the surface of the upper fixed frame 13. The countersunk holes a131 are provided between the through holes of the upper fixed frame 13, and are distributed in a rectangular manner with the through holes.

[0051] like Figure 2 As shown, six force measuring units with the same structure are arranged inside the tool holder body 1. The six force measuring units are arranged along the edge of the lower fixed frame 14 and are respectively a first force measuring unit 3, a second force measuring unit 4, a third force measuring unit 5, a fourth force measuring unit 6, a fifth force measuring unit 7 and a sixth force measuring unit 8.

[0052] The first force measuring unit 3 and the fourth force measuring unit 6 are respectively recessed in the grooves a11 at the front end and the rear end of the tool holder body 1, and form a first inner groove and a fourth inner groove respectively.

[0053] The second force measuring unit 4 and the third force measuring unit 5 are recessed in the groove b12 on the right side of the tool holder body 1 in parallel, and the fifth force measuring unit 7 and the sixth force measuring unit 8 are recessed in the groove b12 on the left side of the tool holder body 1 in parallel.

[0054] like Figure 4 As shown, the force measuring unit includes a force sensing beam and a strain gauge. A cavity 141 is provided between the force sensing beam and the lower fixed frame 14. The upper surface of the force sensing beam does not contact the inner surface of the tool holder body 1. The lower surface of the force sensing beam is higher than the lower surface of the tool holder body 1. The strain gauge is provided on the surface of the force sensing beam.

[0055] A signal acquisition circuit board is arranged in the first inner groove or the fourth inner groove or the first inner groove and the fourth inner groove, and strain gauges arranged on the surfaces of the first force measuring unit 3, the second force measuring unit 4, the third force measuring unit 5, the fourth force measuring unit 6, the fifth force measuring unit 7 and the sixth force measuring unit 8 are all electrically connected to the signal acquisition circuit board.

[0056] Embodiment 2:

[0057] like Figure 3As shown, the force sensing beam is a herringbone beam, and the herringbone beam includes a first crossbeam 9 and a second crossbeam 10. The upper surface, lower surface, left side and right side of the first crossbeam 9 are provided with strain gauges. One end of the first crossbeam 9 is vertically connected to the second crossbeam 10, and the other end is vertically connected to the lower fixed frame 14. The two sides of the second crossbeam 10 are respectively connected to the corresponding inner walls of the groove. Further preferably, the first crossbeam 9 and the second crossbeam 10 are integrally formed. When the force measuring unit is subjected to the main channel force, the first crossbeam 9 can convert the force signal into an electrical signal with higher sensitivity than the traditional rectangular cross-section beam. When the force measuring unit is subjected to interference forces from other channels, the second crossbeam 10 can absorb the interference force, thereby avoiding the influence of the interference force on the test accuracy.

[0058] Working principle:

[0059] In the present application, six force measuring units with the same structure are arranged inside the tool holder body 1, namely the first force measuring unit 3, the second force measuring unit 4, the third force measuring unit 5, the fourth force measuring unit 6, the fifth force measuring unit 7 and the sixth force measuring unit 8, which can realize the measurement of six cutting forces, namely the axial force along three axes and the torque around three axes. Specifically, the coordinate axis xyz is established with the center of the following fixed frame 14 as the origin, wherein the first force measuring unit 3 and the fourth force measuring unit 6 force measuring units sense the cutting force in the x-axis direction; the second force measuring unit 4, the third force measuring unit 5, the fifth force measuring unit 7 and the sixth force measuring unit 8 are used to sense the cutting force in the y-axis direction; the first force measuring unit 3, the second force measuring unit 4, the third force measuring unit 5, the fourth force measuring unit 6, the fifth force measuring unit 7 and the sixth force measuring unit 8 are used to sense the cutting force in the z-direction; the first force measuring unit 3 and the fourth force measuring unit 6 are used to sense the cutting torque around the z-axis, the first force measuring unit 3, the second force measuring unit 4, the third force measuring unit 5, the fourth force measuring unit 6, the fifth force measuring unit 7 and the sixth force measuring unit 8 are used to sense the cutting torque around the x-axis, and the second force measuring unit 4, the third force measuring unit 5, the fifth force measuring unit 7 and the sixth force measuring unit 8 are used to sense the cutting torque around the y-axis.

[0060] The force measuring tool holder's perception of cutting force mainly depends on the force measuring unit therein. When the cutting force is transmitted to the force measuring unit, the force measuring unit, whose mechanical model is a cantilever beam model, will undergo complete deformation, thereby generating strain. The strain gauge attached to the force measuring unit will convert the sensed strain into a change in resistance, and finally the change in resistance will be converted into a voltage signal through a Wheatstone bridge for output and collection.

[0061] This application integrates the force sensing unit into the tool holder. Compared with integrating the force measuring unit into the tool rod, the force measuring unit has a larger design space, so that the cutting force can be better decomposed into six components, including three axial forces along the Cartesian coordinate system and torques around three axes. A more thorough decomposition of the cutting force can greatly improve the test accuracy and avoid interference between channels.

[0062] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A cutting force intelligent sensing tool holder, characterized in that: include: The tool holder body and the force measuring tool holder floating frame with the same structure fixedly arranged on both sides of the tool holder body, The front and rear ends of the knife seat body are respectively provided with vertical grooves a with the same structure, and side pillars are provided on both sides of the groove a. The surface of the side pillars and the surface of the groove a are both provided with a plurality of mounting holes. The left side and right side of the knife seat body are each provided with two grooves b of the same structure, and the two grooves b are arranged vertically in parallel. The upper surface of the knife seat body is provided with an upper fixing frame, and the lower surface is provided with a lower fixing frame. The upper fixing frame and the lower fixing frame are provided correspondingly, and a plurality of through holes distributed in a rectangular shape are provided correspondingly. Six force measuring units with the same structure are arranged inside the tool holder body. The six force measuring units are arranged along the edge of the lower fixed frame and are respectively the first force measuring unit, the second force measuring unit, the third force measuring unit, the fourth force measuring unit, the fifth force measuring unit and the sixth force measuring unit. The first force measuring unit and the fourth force measuring unit are respectively recessed in the grooves a at the front end and the rear end of the tool holder body, and form a first inner groove and a fourth inner groove respectively. The second force measuring unit and the third force measuring unit are concavely arranged in the groove b on the right side of the tool holder body, and the fifth force measuring unit and the sixth force measuring unit are concavely arranged in the groove b on the left side of the tool holder body. The force measuring unit comprises a force sensing beam and a strain gauge, a cavity is arranged between the force sensing beam and the lower fixed frame, the upper surface of the force sensing beam does not contact the inner surface of the tool holder body, the lower surface of the force sensing beam is higher than the lower surface of the tool holder body, and the strain gauge is arranged on the surface of the force sensing beam. A signal acquisition circuit board is arranged in the first inner groove or the fourth inner groove or the first inner groove and the fourth inner groove, and strain gauges arranged on the surfaces of the first force measuring unit, the second force measuring unit, the third force measuring unit, the fourth force measuring unit, the fifth force measuring unit and the sixth force measuring unit are all electrically connected to the signal acquisition circuit board. A plurality of through holes are arranged on the surface of the floating frame of the force measuring tool holder.

2. The cutting force intelligent sensing tool holder according to claim 1, characterized in that: The force sensing beam is a herringbone beam, which includes a first crossbeam and a second crossbeam. Strain gauges are provided on the upper surface, lower surface, left side and right side of the first crossbeam. One end of the first crossbeam is vertically connected to the second crossbeam, and the other end is vertically connected to the lower fixed frame. Both sides of the second crossbeam are respectively connected to the corresponding inner walls of the groove.

3. The cutting force intelligent sensing tool holder according to claim 2, characterized in that: The first cross beam and the second cross beam are integrally formed.

4. The cutting force intelligent sensing tool holder according to claim 3, characterized in that: The surface of the upper fixing frame is also provided with a plurality of countersunk holes a, which are arranged between the through holes of the upper fixing frame and are distributed in a rectangular shape with the through holes.

5. The cutting force intelligent sensing tool holder according to claim 4, characterized in that: The bottom surface of the floating frame of the force measuring tool holder is provided with a plurality of countersunk holes b, and the countersunk holes b and the through holes on the lower surface of the floating frame of the force measuring tool holder are distributed in a straight line.

6. The cutting force intelligent sensing tool holder according to claim 5, characterized in that: The surface of the groove a is provided with a mounting cover, and the mounting cover is fixedly connected to the knife seat body through a mounting hole.

Images