Cutter bar assembly and cutting tool

Abstract

The utility model discloses a cutter bar assembly and a cutting tool, and belongs to the technical field of tools. The cutter bar assembly comprises a cutter bar, a force sensor and a dowel bar, the cutter bar can comprise a cutter head, a first bar body and a second bar body, the force sensor can be installed in an installation groove of the first bar body, and the dowel bar penetrates through a first through hole of the cutter head and a second through hole of the first bar body so as to abut against the stress face of the force sensor. The elastic modulus of the tool bit and the elastic modulus of the second rod body are both larger than that of the first rod body. Due to the fact that the elastic modulus of the first rod body is low, the force sensor is installed in the first rod body, the influence of the cutter bar on cutting force transmission of the dowel bar can be reduced, and the sensitivity and precision of the force sensor can be improved. Moreover, the cutter bar is composed of the cutter head, the first bar body and the second bar body which are different in elasticity modulus, so that the local rigidity of the cutter bar is accurately controlled, and the influence of the rigidity of the cutter bar on the sensitivity of the force sensor is reduced while the stability of the cutter bar is guaranteed.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of cutters, in particular to a cutter bar assembly and a cutting tool. BACKGROUND

[0002] With the development of machining technology, the machining precision is required to be higher and higher. At present, in order to guarantee the quality of cutting machining, a force sensor is usually arranged in the cutting tool. In the process of cutting machining, the force sensor can monitor the cutting force borne by the cutting tool in real time, so as to judge the wear degree and machining state of the cutting tool. For example, the force sensor is electrically connected with a control system. When the cutting force of the cutting tool exceeds a preset threshold, the control system automatically issues an alarm to remind an operator to replace the cutting tool or adjust machining parameters, so as to avoid the problems of machining precision reduction and workpiece scrap due to excessive wear of the cutting tool.

[0003] At present, the force sensor is usually installed on a cutter bar. In the process of cutting a workpiece by a cutting insert on the cutter head, the cutter bar will be deformed under force, the force sensor will produce stress deformation to generate a voltage signal, the voltage signal is amplified by a signal amplifier and then transmitted to the control system, and the control system calculates the actual normal cutting force, actual axial cutting force and actual tangential cutting force of the cutting insert on the workpiece based on the voltage signal.

[0004] However, in the micro-machining process, the force sensor in the current cutting tool may not accurately detect the small force change, resulting in the problem that the tool state and workpiece machining state in the cutting machining cannot be accurately monitored. CONTENT OF THE INVENTION

[0005] The present application provides a cutter bar assembly and a cutting tool. The problem that the force sensor in the cutting tool of the prior art may not accurately detect the small force change, resulting in the problem that the tool state and workpiece machining state in the cutting machining cannot be accurately monitored, can be solved. The technical solution is as follows:

[0006] According to an aspect of the present application, a cutter bar assembly is provided, comprising:

[0007] a cutter bar, the cutter bar comprising a cutter head, a first rod body and a second rod body, two ends of the first rod body being connected with the cutter head and the second rod body respectively, the cutter head having a first through hole, the first rod body having a mounting groove, and an end of the first rod body away from the second rod body having a second through hole, the second through hole being in communication with the first through hole and the mounting groove respectively, the elastic modulus of the cutter head and the second rod body being greater than the elastic modulus of the first rod body;

[0008] a force sensor, the force sensor being located in the mounting groove;

[0009] A force transmission rod, which penetrates the first through hole and is used to apply pressure to the force receiving surface of the force sensor.

[0010] Optionally, the cutter rod further comprises two transition rod bodies, which are fixedly connected to two ends of the first rod body respectively, and one end of each of the two transition rod bodies, which is away from the first rod body, is fixedly connected to the cutter head and the second rod body respectively.

[0011] The elastic modulus of the transition rod body is greater than the elastic modulus of the first rod body and less than the elastic modulus of any one of the cutter head and the second rod body.

[0012] Optionally, the elastic modulus of the transition rod body gradually increases in the direction away from the first rod body.

[0013] Optionally, the cutter head, the first rod body, the two transition rod bodies and the second rod body are of an integral structure.

[0014] Optionally, the ratio of the elastic modulus of the first rod body to the elastic modulus of the cutter head ranges from 70% to 80%, and the ratio of the elastic modulus of the first rod body to the elastic modulus of the second rod body ranges from 70% to 80%.

[0015] Optionally, the force receiving surface of the force sensor protrudes out of the second through hole and abuts against the cutter head.

[0016] Optionally, the cutter rod assembly further comprises a gasket.

[0017] The gasket is located between the force transmission rod and the force sensor, the force transmission rod penetrates the second through hole, and the gasket abuts against the end surface of the force transmission rod and the force receiving surface of the force sensor respectively.

[0018] The contact area of the gasket with the force sensor is greater than the contact area of the gasket with the force transmission rod.

[0019] Optionally, the cutter rod assembly further comprises a positioning member, and the force sensor has a positioning hole.

[0020] The positioning member is fixedly connected to one side of the gasket which is close to the force sensor, and the positioning member is located in the positioning hole.

[0021] Optionally, the force sensor comprises a three-way force sensor, the cutter rod assembly further comprises a wiring part, and the three-way force sensor and the wiring part are electrically connected.

[0022] The wiring part is used to protrude out of the mounting groove to be electrically connected with a data acquisition assembly.

[0023] Or, the first rod body has a threading hole near one end of the second rod body and the second rod body, the wire connection part is used to extend out of the threading hole, and the threading hole is in communication with the mounting slot to be electrically connected with the data acquisition assembly.

[0024] According to another aspect of the present application, a cutting tool is provided, which comprises a tool bar assembly and a cutting insert, the tool bar assembly comprises the tool bar assembly described above, and the cutting insert is mounted on the tool head of the tool bar assembly.

[0025] The technical scheme provided by the embodiments of the present application has the following beneficial effects:

[0026] A tool bar assembly is provided, which comprises a tool bar, a force sensor and a force transmission rod. The tool bar can comprise a tool head, a first rod body and a second rod body. The force sensor can be mounted in a mounting slot of the first rod body. The force transmission rod penetrates a first through hole of the tool head and a second through hole of the first rod body to abut against a force receiving surface of the force sensor. The elastic modulus of the tool head and the second rod body is greater than the elastic modulus of the first rod body. Since the elastic modulus of the first rod body is low, the force sensor is mounted in the first rod body, which can reduce the influence of the tool bar on the force transmission rod transmitting the cutting force and improve the sensitivity and accuracy of the force sensor. Moreover, the tool bar is composed of the tool head, the first rod body and the second rod body with different elastic modulus, which realizes accurate control of the local rigidity of the tool bar, so that the rigidity of the tool bar is reduced while the stability is ensured, the influence of the high rigidity of the tool bar on the sensitivity of the force sensor is reduced, the problem that the force sensor in the cutting tool in the related art can not accurately detect the slight force change, which leads to the inability to accurately monitor the tool state and workpiece processing state in the cutting processing, is solved, the detection accuracy of the force sensor is improved, and the overall efficiency and quality of the cutting processing are improved. BRIEF DESCRIPTION OF DRAWINGS

[0027] In order to more clearly illustrate the technical scheme in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0028] Figure 1 is a structural schematic diagram of a cutting tool provided by the embodiments of the present application;

[0029] Figure 2 is Figure 1 is an exploded structural schematic diagram of the cutting tool shown in FIG. 1;

[0030] Figure 3 is a structural schematic diagram of another cutting tool provided by the embodiments of the present application;

[0031] Figure 4 is a partial sectional view of a cutting tool provided by an embodiment of the present application;

[0032] Figure 5 is a schematic diagram of deformation of a first rod body and a second rod body after subjected to a cutting force provided by an embodiment of the present application;

[0033] Figure 6 is a schematic diagram of another structure of a cutting tool provided by an embodiment of the present application;

[0034] Figure 7 is Figure 6 is a schematic diagram of a cross-sectional structure of the cutting tool shown in FIG. 1 along a position of A1-A2;

[0035] Figure 8 is a partial sectional view of another cutting tool provided by an embodiment of the present application. DETAILED DESCRIPTION

[0036] In order to make the objects, technical solutions and advantages of the present application clearer, the embodiments of the present application will be described in detail below with reference to the drawings.

[0037] Although the present application can be easily embodied in different forms of embodiments, only some specific embodiments are shown in the drawings and described in detail in the present specification, and it can be understood that the present specification should be considered as an exemplary description of the principles of the present application, and is not intended to limit the present application to what is described herein.

[0038] Therefore, one feature indicated in the present specification will be used to explain one feature of one embodiment of the present application, and it is not implied that each embodiment of the present application must have the explained feature. In addition, it should be noted that the present specification describes many features. Although certain features can be combined together to show possible system designs, these features can also be used in other combinations which are not explicitly described. Therefore, unless otherwise specified, the described combinations are not intended to be limiting.

[0039] In the embodiments shown in the drawings, the indications of directions (such as up, down, left, right, front and back) are used to explain the structure and movement of various elements of the present application, which are not absolute but relative. These descriptions are appropriate when these elements are in the positions shown in the drawings. If the positions of these elements change, the indications of directions also change accordingly.

[0040] The cutting tool is a tool used for cutting off the material of a workpiece in machining, and the performance of the cutting tool directly affects the machining quality and efficiency. The basic classification of the cutting tool includes turning tool, boring tool, groove tool and milling tool, etc.

[0041] A force sensor is a device that converts the magnitude of a force into an associated electrical signal, capable of detecting mechanical quantities such as tension, tension, pressure, weight, torque, internal stress and strain. In mechanical processing, force sensors can monitor various mechanical parameters in the cutting process in real time, providing data support for optimizing processing technology and improving processing quality.

[0042] In the field of mechanical processing, a tool bar is used to connect a machine tool and a tool. Currently, the tool bar is usually made of a single material. For example, the tool bar is made of high-strength steel or hard alloy. These materials make the tool have good rigidity and wear resistance. Among them, rigidity refers to the ability of an object to resist deformation, that is, the characteristic of an object to maintain its shape and size under external force. Rigidity can be quantified by elastic modulus. The greater the elastic modulus, the stronger the rigidity of the material.

[0043] The force sensor is usually installed on the tool bar. During the cutting process of the cutting insert on the tool head, the tool bar will be deformed under force, and the force sensor will produce a corresponding stress deformation to generate a voltage signal. Since the tool bar is made of a single material, the rigidity of the tool bar is usually fixed, that is, the tool bar has a fixed reaction to force and vibration during processing. Therefore, the fixed rigidity reduces the adaptability of the tool bar to different processing conditions, resulting in obvious limitations of the tool bar in high-precision measurement and precision machining applications. For example, in a micro-machining process, a tool bar with fixed rigidity may cause the force sensor to fail to accurately capture the small force changes, thereby affecting the processing precision and quality.

[0044] In addition, a tool bar made of a single material cannot meet the requirements of high rigidity and high sensitivity at the same time, that is, due to the strong ability of high-rigidity materials to resist deformation, the tool bar may block part of the cutting force during the cutting process from being transmitted to the force sensor, thereby affecting the accurate measurement of the force sensor, while low-rigidity materials cannot provide sufficient support. Therefore, when performing different processing processes, it is necessary to frequently replace the tool or the tool bar to adapt to different processing tasks, thereby reducing production efficiency.

[0045] The above-mentioned part and all of the technical problems can be optimized by the limited embodiments described below.

[0046] For convenience of description, the embodiments of the present application take a turning tool as an example for description, but this is not a limitation of the present application. The present application can also be applied to other tools such as milling tools, boring tools, slotting tools, hole processing tools, etc.

[0047] Please refer to Figure 1 , Figure 2 and Figure 3 , Figure 1 is a structural schematic diagram of a cutting tool 100 provided by an embodiment of the present application, Figure 2 isFigure 1 An exploded structural schematic view of the cutting tool 100 is shown in FIG. 1, Figure 3 is another structural schematic view of the cutting tool 100 provided by the embodiments of the present application, the cutting tool 100 can include a tool bar assembly 200 and a cutting insert 300; the tool bar assembly 200 can include a tool bar 201, a force sensor 202 and a force transmission rod 203.

[0048] The tool bar 201 can include a tool head 2011, a first rod body 2012 and a second rod body 2013, two ends of the first rod body 2012 are connected with the tool head 2011 and the second rod body 2013 respectively, the tool head 2011 has a first through hole k1, the first rod body 2012 has a mounting groove c1, please refer to Figure 4 , Figure 4 is a partial sectional view of the cutting tool 100 provided by the embodiments of the present application, one end of the first rod body 2012 away from the second rod body 2013 has a second through hole k2, the second through hole k2 is in communication with the first through hole k1 and the mounting groove c1 respectively, the elastic modulus of the tool head 2011 and the second rod body 2013 are both greater than the elastic modulus of the first rod body 2012. It should be noted that, Figure 1 and Figure 3 The opening direction of the mounting groove c1 in the cutting tool 100 shown in FIG. 1 is different, the designer can adjust the opening direction of the mounting groove c1 according to the adaptability of the use scene of the cutting tool 100.

[0049] The tool head 2011, the first rod body 2012 and the second rod body 2013 can be arranged in sequence along the length direction of the tool bar 201, and the first rod body 2012 can be located on the side of the second rod body 2013 close to the tool head 2011. The elastic modulus of the first rod body 2012 is less than the elastic modulus of the second rod body 2013, and the elastic modulus of the first rod body 2012 is also less than the elastic modulus of the tool head 2011, and the elastic modulus of the tool head 2011 can be the same as the elastic modulus of the second rod body 2013. That is, the rigidity of the first rod body 2012 is less than the rigidity of the second rod body 2013, the rigidity of the first rod body 2012 is less than the rigidity of the tool head 2011, the ability of the first rod body 2012 to resist deformation is weaker than the ability of the second rod body 2013 to resist deformation, and the ability of the first rod body 2012 to resist deformation is weaker than the ability of the tool head 2011 to resist deformation.

[0050] The first through hole k1 can pass through the tool head 2011, and the extension direction of the first through hole k1 can be the same as the length direction of the tool bar 201. The first bar body 2012 can have opposite first and second end faces and a side face connected with the first and second end faces, the first end face is located on the side of the first bar body 2012 close to the tool head 2011, and the first end face is connected with the tool head 2011, the second end face is connected with the second bar body 2013, the slot opening of the mounting groove c1 can be located on the side face of the first bar body 2012, one end of the second through hole k2 extends to the first end face of the first bar body 2012, and the other end of the second through hole k2 can extend to the slot wall of the mounting groove c1, and the extension direction of the second through hole k2 can be the same as the length direction of the tool bar 201.

[0051] The force sensor 202 can be located in the mounting groove c1 of the first bar body 2012; the force transmission rod 203 passes through the first through hole k1 of the tool head 2011 and the second through hole k2 of the first bar body 2012, and one end of the force transmission rod 203 abuts against the stress surface of the force sensor 202. The force transmission rod 203 can apply a preset pre-tightening force to the stress surface of the force sensor 202. When the cutting insert 300 on the tool head 2011 cuts a workpiece, the cutting force can be transmitted from the tool head 2011 to the force transmission rod 203, and then transmitted to the first bar body 2012 through the force transmission rod 203, and the first bar body 2012 deforms under the action of the cutting force, so that the one end of the force transmission rod 203 towards the force sensor 202 can be pressed against the force sensor 202 under the action of the cutting force, and the force sensor 202 can generate a corresponding stress deformation to generate a voltage signal, which is amplified by the signal amplifier and then transmitted to the control system.

[0052] Alternatively, as another optional implementation of the embodiment, the stress surface of the force sensor 202 can extend out of the second through hole k2, and the stress surface of the force sensor 202 abuts against the tool head 2011. Such a design can further improve the accuracy of the cutting force, because in the cutting process, the cutting force can be transmitted to the force sensor 202 through the force transmission rod 203, and the cutting force can also be conducted by directly pressing the stress surface of the force sensor 202 through the tool head 2011.

[0053] Please refer to Figure 4 , wherein Figure 4Different materials are represented by different cutting lines in different directions, the material of the first rod body 2012 in which the force sensor 202 is installed can be a material with lower rigidity, for example, the material of the first rod body 2012 can include carbon fiber composite material, since the elastic modulus of the first rod body 2012 is lower, installing the force sensor 202 in the first rod body 2012 can reduce the influence of the cutter bar 201 on the transmission of the cutting force by the force transmission rod 203, and can improve the sensitivity and accuracy of the force sensor 202; the material of the tool bit 2011 and the material of the second rod body 2013 can include steel or hard alloy to ensure the rigidity of the cutter bar 201 as a whole.

[0054] Please refer to Figure 5 , Figure 5 is a schematic diagram of the deformation of the first rod body 2012 and the second rod body 2013 after being subjected to a cutting force, it can be seen that the deformation amount of the first rod body 2012 with lower elastic modulus is obviously larger than the deformation amount of the second rod body 2013 with higher elastic modulus. In the process of cutting the workpiece by the cutting insert 300 on the tool bit 2011, the cutting force is transmitted to the first rod body 2012 through the force transmission rod 203, since the elastic modulus of the first rod body 2012 is lower, the first rod body 2012 is more likely to deform under force, that is, the influence of the first rod body 2012 on the transmission of the force by the force transmission rod 203 can be reduced, even if the cutting force is small, the force transmission rod 203 can also extrude the force sensor 202 under the action of the cutting force, so that the force sensor 202 installed in the first rod body 2012 can sensitively detect the small force changes in the machining process, and the sensitivity and accuracy of the force sensor 202 can be improved. The second rod body 2013 has good rigidity and durability, and can improve the stability and reliability of the cutter bar 201 under high load.

[0055] In this way, by using the tool bit 2011, the first rod body 2012 and the second rod body 2013 with different elastic moduli to form the cutter bar 201, the local rigidity of the cutter bar 201 can be accurately controlled, that is, by regionally adjusting the rigidity of different regions of the cutter bar 201 when designing the cutter bar 201, the influence of the cutter bar 201 on the sensitivity of the force sensor 202 can be reduced while ensuring stability, the detection accuracy of the force sensor 202 can be improved, and thus the overall efficiency and quality of mechanical machining can be improved.

[0056] In summary, the embodiment of the present application provides a tool bar assembly 200, which comprises a tool bar 201, a force sensor 202 and a force transmission rod 203. The tool bar 201 can comprise a tool head 2011, a first rod body 2012 and a second rod body 2013. The force sensor 202 can be installed in the mounting groove c1 of the first rod body 2012. The force transmission rod 203 penetrates the first through hole k1 of the tool head 2011 and the second through hole k2 of the first rod body 2012 to abut against the stress surface of the force sensor 202. The elastic modulus of the tool head 2011 and the second rod body 2013 is greater than the elastic modulus of the first rod body 2012. Since the elastic modulus of the first rod body 2012 is low, the force sensor 202 is installed in the first rod body 2012, which can reduce the influence of the tool bar 201 on the force transmission rod 203 to transmit the cutting force, and can improve the sensitivity and accuracy of the force sensor 202. Moreover, the tool bar 201 is composed of the tool head 2011, the first rod body 2012 and the second rod body 2013 with different elastic modulus, which realizes the accurate control of the local rigidity of the tool bar 201, so that the tool bar 201 can ensure stability while reducing the influence of high rigidity of the tool bar on the sensitivity of the force sensor. The problem that the force sensor 202 in the cutting tool 100 in the related art can not accurately detect the slight force change, which leads to the failure to accurately monitor the tool state and workpiece processing state in the cutting process, can be solved. The detection accuracy of the force sensor 202 can be improved, and the overall efficiency and quality of the cutting process can be improved.

[0057] Please refer to Figure 6 , Figure 6 is another structural schematic diagram of a cutting tool 100 provided by the embodiment of the present application. In an optional implementation, the tool bar 201 can further comprise two transition rod bodies 2014. The two transition rod bodies 2014 are respectively fixedly connected with two ends of the first rod body 2012. The two transition rod bodies 2014 are respectively fixedly connected with the tool head 2011 and the second rod body 2013 at the ends away from the first rod body 2012. In the embodiment of the present application, one of the two transition rod bodies 2014 between the first rod body 2012 and the second rod body 2013 is taken as an example for description. The two ends of the transition rod body 2014 are respectively connected with the first rod body 2012 and the second rod body 2013. The elastic modulus of the transition rod body 2014 is greater than the elastic modulus of the first rod body 2012 and less than the elastic modulus of the second rod body 2013.

[0058] Since the elastic modulus of the first rod body 2012 and the elastic modulus of the second rod body 2013 are different, when the first rod body 2012 and the second rod body 2013 are directly fixedly connected, stress concentration can occur at the connection position of the first rod body 2012 and the second rod body 2013, which can cause fatigue cracks of the tool bar 201 at the position of stress concentration.

[0059] In the embodiment, the transition rod 2014 is arranged between the first rod 2012 and the second rod 2013, so that the connection between the first rod 2012 and the second rod 2013 can be smoothly transitioned, the stress concentration phenomenon at the connection between the first rod 2012 and the second rod 2013 can be improved, and the possibility of damage of the cutter bar 201 can be reduced.

[0060] In an optional embodiment, the elastic modulus of the transition rod 2014 can gradually increase in a direction away from the first rod 2012. The elastic modulus of the end of the transition rod 2014 connected with the first rod 2012 can be the same as or similar to the elastic modulus of the first rod 2012, the elastic modulus of the end of the transition rod 2014 connected with the second rod 2013 can be the same as or similar to the elastic modulus of the second rod 2013, and the elastic modulus of the transition rod 2014 itself can gradually change.

[0061] It should be noted that the transition rod 2014 between the cutter head 2011 and the first rod 2012 is symmetrical to the transition rod 2014 between the second rod 2013 and the first rod 2012, and the embodiment of the present application will not be described again. The transition rod 2014 between the cutter head 2011 and the first rod 2012 has a third through hole, which can be in communication with the first through hole k1 and the second through hole k2, respectively.

[0062] In this way, seamless transition between multiple regions on the cutter bar 201 can be achieved, the force distribution on the cutter bar 201 can be uniform through the transition rod 2014, the stress concentration point on the cutter bar 201 can be avoided, and the strength of the cutter bar 201 can be weakened or the cutter bar 201 can be prematurely fatigued.

[0063] In an optional embodiment, the cutter head 2011, the first rod 2012, the two transition rods 2014 and the second rod 2013 can be an integral structure; or, the two ends of one transition rod 2014 can be welded with the second rod 2013 and the first rod 2012, respectively, and the two ends of the other transition rod 2014 can be welded with the cutter head 2011 and the first rod 2012, respectively.

[0064] In the process of manufacturing the tool bar 201, the tool bar 201 can be manufactured by using the 3D printing technology. The manufacturing process of the tool bar 201 can include scanning the tool bar 201 powder by using a high-energy beam to achieve precise local melting and solidification, and using different powders at different positions to customize the lightweight tool bar 201 to meet specific production needs. In this way, not only the production difficulty can be reduced, but also the flexibility and diversity of the tool design can be improved. Moreover, the tool bar 201 with an integrated structure has good ability to withstand the load of cutting processing, which can improve the stability and safety of the tool bar 201 in the production process.

[0065] In an alternative embodiment, the ratio of the elastic modulus of the first rod body 2012 to the elastic modulus of the tool head 2011 is in the range of 70% to 80%, and the ratio of the elastic modulus of the first rod body 2012 to the elastic modulus of the second rod body 2013 is in the range of 70% to 80%. For example, the elastic modulus of the second rod body 2013 can be in the range of 1.8 Gpa to 2.5 Gpa, such as 1.8 Gpa, 1.9 Gpa, 2.0 Gpa, 2.1 Gpa, 2.3 Gpa or 2.5 Gpa; the elastic modulus of the first rod body 2012 can be in the range of 1.2 Gpa to 2.0 Gpa, such as 1.2 Gpa, 1.3 Gpa, 1.4 Gpa, 1.6 Gpa, 1.8 Gpa or 2.0 Gpa. The range of the elastic modulus of the tool head 2011 and the range of the elastic modulus of the second rod body 2013 can be the same or similar.

[0066] Please refer to Figure 2 and Figure 4 In an alternative embodiment, the force transmission rod 203 can include a screw rod, and the inner wall of the first through hole k1 of the tool head 2011 has a screw thread; the screw rod can be threadedly connected with the tool head 2011. By threadedly connecting the screw rod with the tool head 2011, the following two effects can be achieved: on the one hand, the screw rod can be fixedly installed on the tool head 2011; on the other hand, the screw rod can rotate around its central axis to enable the screw rod to move in the length direction of the screw rod, thereby adjusting the pressure of the screw rod on the force sensor 202. For example, when different force sensors 202 are used, the pressure of the screw rod on the force sensor 202 can be adjusted by rotating the screw rod, so that the pressure of the screw rod on different force sensors 202 remains consistent, which can improve the applicability of the tool bar 201.

[0067] Please refer to Figure 2 , Figure 3 and Figure 4In an optional embodiment, the tool bar assembly 200 can further include a gasket 204; the gasket 204 can be located between the force transmission rod 203 and the force sensor 202, and the gasket 204 can abut the end surface of the force transmission rod 203 and the force receiving surface of the force sensor 202, respectively. The material of the gasket 204 can include stainless steel. The contact area of the gasket 204 with the force sensor 202 is greater than the contact area of the gasket 204 with the force transmission rod 203. For example, the gasket 204 can include opposite first and second surfaces, wherein the first surface can be in contact with the force receiving surface of the force sensor 202, and the second surface can be in contact with the end surface of the force transmission rod 203 away from the tool head 2011. At least a part of the first surface can be in contact with the force receiving surface of the force sensor 202, and a part of the second surface can be in contact with the end surface of the force transmission rod 203. The area of the at least a part of the first surface is greater than the area of the part of the second surface. In this way, by arranging the gasket 204 between the force transmission rod 203 and the force sensor 202, the force receiving area between the force transmission rod 203 and the force sensor 202 can be increased, thereby improving the measurement accuracy of the force sensor 202.

[0068] Please refer to Figure 2 and Figure 7 , Figure 7 is Figure 6 the cross-sectional structure schematic view of the cutting tool 100 along A1-A2 position. In an optional embodiment, the tool bar assembly 200 can further include a positioning member 205, and the force sensor 202 has a positioning hole k3; the positioning member 205 is fixedly connected to the side of the gasket 204 close to the force sensor 202, and the positioning member 205 is located in the positioning hole k3. During the assembly of the tool bar 201, the gasket 204 and the positioning member 205 fixedly connected can be assembled in the positioning hole k3 of the force sensor 202 first, and then the assembled gasket 204, positioning member 205 and force sensor 202 can be placed in the mounting groove c1 of the first bar body 2012, and the end of the screw is abutted with the side of the gasket 204 away from the force sensor 202 by rotating the screw.

[0069] Please refer to Figure 4 and Figure 8 , Figure 8 is another partial cross-sectional view of the cutting tool 100 provided by the embodiments of the present application. In an optional embodiment, the force sensor 202 can include a three-way force sensor 2021, and the tool bar assembly 200 further includes a wiring part 206, and the three-way force sensor 2021 and the wiring part 206 are electrically connected. In the embodiments of the present application, the electrical connection of the three-way force sensor 2021 can be realized in the following two ways:

[0070] The first way is as shown in Figure 4As shown, the wiring portion 206 is used to extend out of the mounting groove c1 to be electrically connected with the data acquisition assembly. As an example, the wiring portion 206 is electrically connected with a signal transmission cable after extending out of the mounting groove c1, and the signal transmission cable is used to pass through signal amplifiers, data acquisition units and other components.

[0071] In the second mode, as shown in FIG. 2B, the first rod body 2012 and the second rod body 2013 are connected by a connecting rod 2014, and the connecting rod 2014 is arranged in the mounting groove c1 of the first rod body 2012. Figure 8 As shown, the first rod body 2012 and the second rod body 2013 each have a threading hole k4 near one end, and the threading hole k4 is in communication with the mounting groove c1. The wiring portion 206 is used to extend out of the threading hole k4 to be electrically connected with the data acquisition assembly. In this way, the waterproof and dustproof performance of the force sensor 202 can be improved.

[0072] In summary, the embodiment of the present application provides a tool bar assembly 200, which includes a tool bar 201, a force sensor 202 and a force transmission rod 203. The tool bar 201 can include a tool head 2011, a first rod body 2012 and a second rod body 2013. The force sensor 202 can be installed in the mounting groove c1 of the first rod body 2012. The force transmission rod 203 penetrates the first through hole k1 of the tool head 2011 and the second through hole k2 of the first rod body 2012 to abut against the force receiving surface of the force sensor 202. The elastic modulus of the tool head 2011 and the second rod body 2013 is greater than the elastic modulus of the first rod body 2012. Since the elastic modulus of the first rod body 2012 is low, the force sensor 202 is installed in the first rod body 2012, which can reduce the influence of the tool bar 201 on the force transmission rod 203 to transmit the cutting force, and can improve the sensitivity and accuracy of the force sensor 202. Moreover, the tool bar 201 is composed of the tool head 2011, the first rod body 2012 and the second rod body 2013 with different elastic moduli, which realizes accurate control of the local rigidity of the tool bar 201, so that the tool bar 201 can ensure stability while reducing the influence of high rigidity of the tool bar on the sensitivity of the force sensor. This can solve the problem that the force sensor 202 in the cutting tool 100 in the related art can not accurately detect the small force change, which leads to the inability to accurately monitor the tool state and workpiece processing state in the cutting process. The detection accuracy of the force sensor 202 can be improved, so that the overall efficiency and quality of the cutting process can be improved.

[0073] Please refer to Figure 1The embodiments of the present application also provide a cutting tool 100, which can include the tool bar assembly 200 and the cutting blade 300. The tool bar assembly 200 can include the tool bar assembly 200 in any of the above embodiments, and the cutting blade 300 is installed on the tool head 2011 of the tool bar assembly 200. During the cutting process of the cutting blade 300, the tool head 2011 is subjected to the cutting force, which is transmitted to the force receiving surface of the sensor in contact with the force transmission rod 203. The tool head 2011 is subjected to the cutting force in different directions and degrees, which can cause the force transmission rod 203 to apply extrusion in different directions and degrees to the force receiving surface of the sensor, so that the three-way force sensor 2021 can obtain the cutting force of the tool head 2011, and further obtain the cutting force of the cutting blade 300.

[0074] It should be noted that in the drawings, the dimensions of the regions can be exaggerated for the purpose of illustration. It will be understood that when an element is referred to as being "on" another element, it can be directly on the other element or intervening elements can also be present. In addition, it will be understood that when an element is referred to as being "under" another element, it can be directly under the other element, or one or more intervening elements can also be present. In addition, it will also be understood that when an element is referred to as being "between" two elements, it can be the only element between the two elements, or one or more intervening elements can also be present. Like reference numerals refer to like elements throughout.

[0075] In the present application, the terms "first" and "second" are used only for descriptive purposes and are not to be construed as indicating or implying relative importance. The term "a plurality of" refers to two or more, unless otherwise specifically defined.

[0076] The above description is only optional embodiments of the present application, and is not used to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A tool holder assembly, characterized in that, include: A tool holder, comprising a tool head, a first rod body, and a second rod body, wherein both ends of the first rod body are connected to the tool head and the second rod body respectively, the tool head has a first through hole, the first rod body has a mounting groove, and the end of the first rod body opposite to the second rod body has a second through hole, the second through hole communicating with the first through hole and the mounting groove respectively, and the elastic modulus of the tool head and the second rod body is greater than the elastic modulus of the first rod body; A force sensor, wherein the force sensor is located in the mounting slot; A force transmission rod passes through the first through hole and is used to apply pressure to the force-receiving surface of the force sensor.

2. The tool holder assembly according to claim 1, characterized in that, The cutter bar also includes two transition rods, which are fixedly connected to both ends of the first rod, and the ends of the two transition rods opposite to the first rod are fixedly connected to the cutter head and the second rod, respectively. The elastic modulus of the transition rod is greater than that of the first rod, but less than that of either the cutter head or the second rod.

3. The tool holder assembly according to claim 2, characterized in that, The elastic modulus of the transition rod gradually increases in the direction away from the first rod.

4. The tool holder assembly according to claim 2, characterized in that, The cutter head, the first rod, the two transition rods, and the second rod are an integral structure.

5. The tool holder assembly according to claim 1, characterized in that, The ratio of the elastic modulus of the first rod to the elastic modulus of the cutter head is in the range of 70% to 80%, and the ratio of the elastic modulus of the first rod to the elastic modulus of the second rod is in the range of 70% to 80%.

6. The tool holder assembly according to any one of claims 1 to 5, characterized in that, The force sensor's force-receiving surface extends out of the second through hole and abuts against the cutter head and the force transmission rod.

7. The tool holder assembly according to any one of claims 1 to 5, characterized in that, The tool holder assembly also includes a gasket; The gasket is located between the force transmission rod and the force sensor. The force transmission rod passes through the second through hole, and the gasket abuts against the end face of the force transmission rod and the force-receiving surface of the force sensor, respectively. The contact area between the gasket and the force sensor is greater than the contact area between the gasket and the force transmission rod.

8. The tool holder assembly according to claim 7, characterized in that, The tool holder assembly also includes a positioning element, and the force sensor has a positioning hole; The positioning element is fixedly connected to the side of the pad near the force sensor, and the positioning element is located in the positioning hole.

9. The tool holder assembly according to claim 1, characterized in that, The force sensor includes a triaxial force sensor, and the tool holder assembly also includes a wiring part, wherein the triaxial force sensor and the wiring part are electrically connected. The wiring portion is used to extend out of the mounting slot for electrical connection with the data acquisition component; Alternatively, the first rod body has a wire hole at one end near the second rod body and the second rod body is provided with a wiring portion for extending out of the wire hole. The wire hole communicates with the mounting groove for electrical connection with the data acquisition component.

10. A cutting tool, characterized in that, The cutting tool includes a tool holder assembly and a cutting insert, the tool holder assembly including the tool holder assembly according to any one of claims 1 to 9, and the cutting insert being mounted on the tool head of the tool holder assembly.

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