EDM milling compound tool with discharge compensation gap

Abstract

The invention discloses an electrode automatic compensation gap milling tool, comprising a tool holder assembly, a discharge assembly and a gap compensation mechanism provided on the tool holder assembly, the discharge assembly being used for discharging to a workpiece surface, and when the gap between the discharge assembly and the workpiece surface is greater than or less than the discharge gap, the gap compensation mechanism drives the discharge assembly to move so that the discharge assembly moves to a position where the gap between the discharge assembly and the workpiece surface is equal to the discharge gap. The gap compensation mechanism enables the discharge assembly to move when the gap between the discharge assembly and the workpiece surface is greater than or less than the discharge gap, and moves to a position where the gap between the discharge assembly and the workpiece surface is equal to the discharge gap, thereby ensuring the discharge efficiency of the discharge assembly.

Description

[Technical field]

[0001] The present application relates to a milling tool, in particular to an electric discharge milling composite tool with an electric discharge compensation gap. [Background technology]

[0002] Existing EDM milling tools include a copper electrode for discharging to a workpiece. There is a gap between the copper electrode and the workpiece when the copper electrode is discharging to the workpiece. The copper electrode is worn out due to continuous discharge during the EDM-assisted milling process, resulting in a gradual increase in the gap between the copper electrode and the workpiece, thereby reducing the discharge efficiency of the copper electrode and shortening the service life of the tool. [Summary of the invention]

[0003] The purpose of this application is to provide an electric discharge milling composite tool with a discharge compensation gap. Through the gap compensation mechanism, the discharge component is moved when the gap with the workpiece surface is greater than or less than the discharge gap, and moved to a position where the gap with the workpiece surface is equal to the discharge gap, thereby ensuring the discharge efficiency of the discharge component.

[0004] This application is implemented through the following technical solutions:

[0005] An electric discharge milling composite tool with a discharge compensation gap comprises a tool holder assembly, on which a discharge assembly and a gap compensation mechanism are provided. The discharge assembly is used to discharge to a workpiece surface. When the gap between the discharge assembly and the workpiece surface is greater than or less than the discharge gap, the gap compensation mechanism drives the discharge assembly to move so that the discharge assembly moves to a position where the gap with the workpiece surface is equal to the discharge gap.

[0006] In the discharge milling composite tool with a discharge compensation gap as described above, the gap compensation mechanism includes a piezoelectric component and a push rod that swings under the drive of the piezoelectric component, and the push rod moves the discharge component when it swings.

[0007] In the discharge milling composite tool with a discharge compensation gap as described above, the piezoelectric component includes a fixing seat arranged on the tool holder component and a piezoelectric ceramic arranged on the fixing seat.

[0008] As described above, in the discharge milling composite tool with a discharge compensation gap, the push rod is formed with an elastic portion connected to the fixed seat and a first pushing portion abutting against the telescopic end of the piezoelectric ceramic, and the discharge assembly is connected to the push rod.

[0009] As described above, the discharge milling composite tool with a discharge compensation gap is formed with a hinged portion hinged to the tool holder assembly and a second push portion abutting against the telescopic end of the piezoelectric ceramic. When the push rod swings, it obliquely pushes the discharge assembly to move toward the workpiece.

[0010] As described above, the discharge milling composite tool with a discharge compensation gap, the discharge component includes a mounting seat that can slide relative to the tool holder assembly and an electrode sheet arranged in the mounting seat, one of the tool holder assembly and the mounting seat is provided with a guide groove, and the other of the two is provided with a slider that slides with the guide groove.

[0011] As described above, in the discharge milling composite tool with a discharge compensation gap, an elastic member is provided in the guide groove for elastically pressing the mounting seat toward the push rod.

[0012] As described above, in the discharge milling composite tool with a discharge compensation gap, the tool holder assembly is sleeved with an insulating sleeve that can rotate relative to the tool holder assembly, and a plurality of conductive components are fixedly mounted on the insulating sleeve, and the plurality of conductive components are connected via a connecting assembly.

[0013] As described above, in the discharge milling composite tool with a discharge compensation gap, the conductive component includes a metal sleeve sleeved on the insulating sleeve and a brush arranged on the metal sleeve, and the connecting component includes a plurality of connecting clamps and a connecting rod connecting the plurality of connecting clamps, and the connecting clamps are connected to the brush.

[0014] As described above, the discharge milling composite tool with a discharge compensation gap is provided with a tool for cutting a workpiece on the tool holder assembly, and an insulating assembly is provided between the tool and the tool holder assembly. The insulating assembly includes an insulating sheet provided between the tool and the tool holder assembly and an insulating fastener connecting the tool, the insulating sheet and the tool holder assembly.

Brief Description of the Drawings

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for describing the embodiments are briefly introduced below.

[0016] Figure 1 This is a schematic diagram of the structure of the automatic electrode gap compensation system of the discharge milling composite tool in this application;

[0017] Figure 2 A stereoscopic view of a milling tool embodiment 1 in a first direction in an electrode gap automatic compensation system for an electric discharge milling composite tool of the present application;

[0018] Figure 3 A stereoscopic view of the milling tool embodiment 1 in the second direction in the electrode gap automatic compensation system of the discharge milling composite tool of the present application;

[0019] Figure 4 for Figure 3 A partial enlarged view of the middle A;

[0020] Figure 5A top view of a milling tool embodiment 1 in an electrode gap automatic compensation system for an electric discharge milling composite tool of the present application;

[0021] Figure 6 A three-dimensional diagram of a tool holder assembly in Example 1 of a milling tool in an automatic electrode gap compensation system of an electric discharge milling composite tool of the present application;

[0022] Figure 7 A stereoscopic view of a milling tool embodiment 2 in an electrode gap automatic compensation system for an electric discharge milling composite tool of the present application;

[0023] Figure 8 for Figure 7 A partial enlarged view of point B in the middle;

[0024] Fig. 9 for Figure 8 A partial enlarged view of point C in the middle;

[0025] Fig.10 A cross-sectional view of a milling tool embodiment 2 in an electrode gap automatic compensation system for an electric discharge milling composite tool of the present application;

[0026] Fig.11 A top view of a milling tool embodiment 2 in an electrode gap automatic compensation system for an electric discharge milling composite tool of the present application;

[0027] Fig.12 This is a stereoscopic view of the tool holder assembly in Example 2 of the milling tool in the electrode gap automatic compensation system of the discharge milling composite tool of the present application. [Specific implementation method]

[0028] In order to make the technical problems, technical solutions and beneficial effects solved by the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0029] The present invention provides an automatic compensation method for electrode gap of an electric discharge milling composite tool, comprising the following steps:

[0030] S1: The detection module monitors the real-time electrical signal between the discharge component and the two ends of the workpiece, and sends the acquired real-time electrical signal to the compensation control module;

[0031] S2: The compensation control module judges the real-time electrical signal. When the real-time electrical signal of the discharge machining is consistent with the preset electrical signal, it is considered that the gap between the discharge component and the workpiece is equal to the discharge gap, and the discharge component does not need to perform position compensation. When the real-time electrical signal is inconsistent with the preset electrical signal, it is considered that the gap between the discharge component and the workpiece is greater than or less than the discharge gap, and the discharge component needs to perform position compensation.

[0032] S3: When the discharge component needs to be positionally compensated, the compensation displacement D is input into the compensation control module. After the compensation control module calculates the compensation voltage V, the compensation voltage V is applied to the gap compensation mechanism to move the discharge component toward the direction close to the workpiece to compensate for the gap;

[0033] S4: when the real-time electrical signal is consistent with the preset electrical signal, stop compensation; when the real-time electrical signal is still inconsistent with the preset electrical signal, repeat step S3 to continue compensation until the real-time electrical signal is consistent with the preset electrical signal;

[0034] S5: When the real-time electrical signal is a short-circuit electrical signal, the compensation negative displacement -D is input into the compensation control module, and the compensation control module calculates the decompression voltage -V and then decompresses the gap compensation mechanism, so that the discharge component moves in a direction away from the workpiece to reversely compensate the gap;

[0035] S6: When the real-time electrical signal is consistent with the preset electrical signal, stop reverse compensation; when the real-time electrical signal is still inconsistent with the preset electrical signal, repeat step S5 to continue reverse compensation until the real-time electrical signal is consistent with the preset electrical signal.

[0036] This method moves the discharge component to a position where the real-time electrical signal is consistent with the preset electrical signal through the cooperation of the detection module, the compensation control module and the gap compensation mechanism. The discharge component being in this position is conducive to ensuring its discharge efficiency and improving the service life of the tool.

[0037] When the real-time electrical signal is consistent with the preset electrical signal, the gap between the discharge component and the workpiece is the discharge gap.

[0038] This method is applied to the automatic compensation system of the electrode gap of the discharge milling composite tool, such as Figure 1As shown, the system includes a workpiece 100, an electric discharge milling composite tool 200, a power module 300, a detection module 400, and a compensation control module 500. The electric discharge milling composite tool 200 includes a tool holder component 1, a discharge component 2, and a gap compensation mechanism 3, wherein the discharge component 2 and the gap compensation mechanism 3 are arranged on the tool holder component 1, the negative pole of the power module 300 is connected to the discharge component 2, and the positive pole of the power module 300 is connected to the workpiece 100. The detection module 400 is used to obtain a real-time electrical signal between the discharge component 2 and the two ends of the workpiece 100. The detection module 400 and the compensation control module 500 is electrically connected to transmit a real-time electrical signal to the compensation control module 500, wherein the detection module 400 is an oscilloscope or other existing distance measuring equipment, and the compensation control module 500 is electrically connected to the gap compensation mechanism 3 to drive the gap compensation mechanism 3 to move, and the gap compensation mechanism 3 drives the discharge component 2 to move when it moves. When the real-time electrical signal is inconsistent with the preset electrical signal, the compensation control module 500 drives the gap compensation mechanism 3 to move, so that the discharge component 2 moves to a position where the real-time electrical signal is consistent with the preset electrical signal, even if the discharge component 2 moves to a position where the gap with the workpiece surface is equal to the discharge gap.

[0039] Further, as a preferred embodiment of the present invention but not limiting, the gap compensation mechanism 3 includes a piezoelectric component 301 electrically connected to the compensation control module 500 and a push rod 302 swinging under the drive of the piezoelectric component 301, and the push rod 302 drives the discharge component 2 to move when swinging, and the piezoelectric component 301 includes a fixed seat 3011 arranged on the tool holder component 1 and a piezoelectric ceramic 3012 arranged on the fixed seat 3011. Among them, the piezoelectric drive has the advantages of small size, high electromechanical coupling efficiency, high displacement resolution, fast response speed, good stability, etc., and can achieve high-precision position positioning and error compensation.

[0040] Further, as a preferred embodiment of the present invention but not limiting, the compensation control module 500 includes a control module 600 electrically connected to the detection module 400 and a piezoelectric voltage controller 700 electrically connected to the control module 600, the control module 600 includes a Matlab system for data processing and an existing PI inverse analytical model based on hysteresis compensation, the piezoelectric voltage controller 700 is electrically connected to the piezoelectric ceramic 3012 for controlling the expansion and contraction amount of the piezoelectric ceramic 3012, in step S3, the compensation displacement D is input into the Matlab system, and the extension value d of the piezoelectric ceramic is obtained by using the formula d=D / A, A is the magnification factor of the flexible hinge mechanism, then, the extension value d is input into the existing PI inverse analytical model based on hysteresis compensation to calculate the compensation voltage V of the piezoelectric ceramic, then, the piezoelectric voltage controller 700 applies pressure to the piezoelectric ceramic 3012 according to the compensation voltage V, and the piezoelectric ceramic 3012 extends after being pressurized to push the push rod 302 to swing, so that the discharge assembly 2 moves toward the direction of the workpiece 100 to compensate for the gap. The Matlab system is an existing system, and the existing PI inverse analytical model based on hysteresis compensation is an existing mathematical model. The size of the compensation displacement D is: 3 μm ~7 μm , preferably, the compensation displacement D is 5 μm , the value of A is 5 to 15. This method realizes the movement of the discharge assembly 2 and has simple operation and high compensation accuracy.

[0041] Further, as a preferred embodiment of the present invention but not limiting, in step S5, the compensation negative displacement -D is input into the Matlab system, and the contraction value -d of the piezoelectric ceramic 3012 is obtained by using the formula -d=-D / A, where A is the magnification of the flexible hinge mechanism. Then, the contraction value -d is input into the existing PI inverse analytical model based on hysteresis compensation to calculate the decompression voltage -V of the piezoelectric ceramic 3012. Then, the piezoelectric voltage controller 700 decompresses the piezoelectric ceramic 3012 according to the decompression voltage -V. After the piezoelectric ceramic 3012 is decompressed, it contracts to make the push rod 302 swing in the opposite direction, so that the discharge component 2 moves in the direction away from the workpiece 100 to compensate for the gap in the opposite direction. This method realizes the reverse movement of the discharge component 2, and is simple to operate and has high compensation accuracy.

[0042] Figure 2-6This is an embodiment 1 of the discharge milling composite tool 200. As shown in the figure, the push rod 302 is formed with an elastic part 3021 connected to the fixed seat 3011 and a first push part 3022 that abuts against the telescopic end of the piezoelectric ceramic 3012, and the discharge component 2 is connected to the push rod 302. Among them, the elastic part 3021, the first push part 3022, the push rod 302 and the fixed seat 3011 are all made of elastic materials. This structure realizes the amplification of the micro displacement of the piezoelectric ceramic 3012 and transmits it to the discharge component 2 through the push rod 302 that is connected to the discharge component 2 and can swing under the push of the piezoelectric ceramic 3012, so that the discharge component 2 moves closer to or away from the workpiece 100, compensates for the excess gap caused by electrode loss, and moves the discharge component to a position where the gap with the workpiece is equal to the discharge gap, thereby ensuring the discharge efficiency of the discharge component.

[0043] Preferably, the elastic part 3021, the first pushing part 3022, the push rod 302 and the fixed seat 3011 are integrally formed, with a simple structure and convenient processing. As can be seen from the figure, the fixed seat 3011 is connected to the knife seat assembly 1, and the elastic part 3021, the first pushing part 3022 and the push rod 302 all form a gap with the knife seat assembly 1. This structure prevents the push rod 302 from rubbing against the knife seat assembly 1 when swinging.

[0044] Further, as a preferred embodiment of the present invention but not limiting, the first pushing portion 3022 is of the same height as the piezoelectric ceramic 3012. This structure increases the contact area between the first pushing portion 3022 and the piezoelectric ceramic 3012, so that the piezoelectric ceramic 3012 can better act on the first pushing portion 3022.

[0045] Further, as a preferred embodiment of the present invention but not limiting, the knife seat assembly 1 includes a knife seat 101 and a knife handle 102 connected to the knife seat 101, the knife handle 102 is sleeved with an insulating sleeve 11 that can rotate relative to it, and a plurality of conductive components 12 are fixed on the insulating sleeve 11, and the plurality of conductive components 12 are connected through a connecting component 13. Among them, the conductive component 12 includes a metal sleeve 121 sleeved on the insulating sleeve 11 and a brush 122 connected to the metal sleeve 121, the number of the brushes 122 is two, and the two brushes 122 are arranged opposite to each other on the metal sleeve 121. Among them, the connecting component 13 includes a plurality of connecting clamps 131 and a connecting rod 132 connecting the plurality of connecting clamps 131, and the plurality of connecting clamps 131 are respectively connected to the plurality of brushes 122. Among them, the metal sleeve 121 is iron, the brush 122 is a carbon rod, the tool handle 102 is connected to the main shaft of the machine tool and rotates with the main shaft, the connecting rod 132 is fixed on the machine tool and is insulated, and when the tool handle 102 and the conductive component 12 rotate relative to each other, current is generated on the metal sleeve 121. As can be seen from the figure, the multiple conductive components 12 include a first conductive component (not marked in the figure), a second conductive component (not marked in the figure) and a third conductive component (not marked in the figure), the first conductive component is connected to the discharge component 2, the second conductive component is connected to the positive electrode of the piezoelectric ceramic 3012, and the third conductive component is connected to the negative electrode of the piezoelectric ceramic 3012. This structure forms two independent power supply systems to prevent series connection or short circuit.

[0046] Further, as a preferred embodiment of the present invention but not limiting, the knife handle 102 is formed with a second lead groove 20 opened at its circumferential side and extending along its axial direction, and the knife seat 101 is formed with a plurality of third wire through holes 30 extending along its axial direction. This structure facilitates the lead-out and storage of the wires, making the overall structure more compact.

[0047] Further, as a preferred embodiment of the present invention but not limiting, the number of the discharge components 2 is multiple, and the multiple discharge components 2 are arranged at intervals along the circumference of the tool holder component 1, and the number of the gap compensation mechanisms 3 is the same as that of the discharge components 2, and the multiple gap compensation mechanisms 3 correspond to the multiple discharge components 2 one by one. This arrangement is conducive to improving the processing efficiency of the tool.

[0048] Further, as a preferred embodiment of the present invention but not limiting, the discharge assembly 2 includes an electrode sheet 203, a gasket 204 disposed between the electrode sheet 203 and the push rod 302, and a fastener 205 connecting the electrode sheet 203, the gasket 204 and the push rod 302. Specifically, the fastener 205 is a stainless steel screw, and the electrode sheet 203 is a copper electrode. This structure is simple and easy to implement.

[0049] Further, as a preferred embodiment of the present invention but not limiting, the tool holder assembly 1 is provided with a tool 4 for cutting a workpiece, and an insulating assembly 5 is provided between the tool 4 and the tool holder assembly 1. This arrangement can prevent the tool 4 from being electrically conductive and causing a short circuit when the tool 4 cuts a workpiece.

[0050] Further, as a preferred embodiment of the present invention but not limiting, the insulating assembly 5 includes an insulating sheet 51 disposed between the tool 4 and the tool holder assembly 1 and an insulating fastener 52 connecting the tool 4, the insulating sheet 51 and the tool holder assembly 1. The insulating sheet 51 and the insulating fastener 52 are both made of ceramic. This structure is simple and easy to implement.

[0051] Further, as a preferred embodiment of the present invention but not limiting, the number of the cutting tools 4 is multiple, and the multiple cutting tools 4 are arranged at intervals in the circumferential direction of the cutting tool holder assembly 1. The multiple cutting tools 4 and the multiple discharge assemblies 2 are arranged alternately and at intervals. This arrangement is conducive to improving the processing efficiency of the cutting tools.

[0052] Figure 7-12 This is Example 2 of the discharge milling composite tool 200, which differs from Example 1 in that a hinge portion 3023 hinged to the tool holder assembly 1 and a second pushing portion 3024 abutting against the telescopic end of the piezoelectric ceramic 3012 are formed on the push rod 302. When the push rod 302 swings, it obliquely pushes the discharge assembly 2 to move the discharge assembly 2 closer to or away from the workpiece 100, compensating for excess gap caused by electrode loss, and moving the discharge assembly to a position where the gap with the workpiece is equal to the discharge gap, thereby ensuring the discharge efficiency of the discharge assembly.

[0053] The push rod 302 is provided with a first inclined surface (not shown in the figure) on the side opposite to the piezoelectric component 301, and the piezoelectric component 301 is provided with a second inclined surface (not shown in the figure) that is obliquely pushed with the first inclined surface. The oblique push design allows the piezoelectric ceramic 3012 to be arranged on a diagonal line, which is conducive to saving space for placing the piezoelectric ceramic 3012 with a longer side length, so as to generate a greater thrust and ensure the smooth push-out of the piezoelectric component 301.

[0054] Furthermore, the difference from the embodiment 1 is that the discharge assembly 2 comprises a mounting seat 201 which can slide relative to the blade seat assembly 1 and an electrode sheet 202 arranged in the mounting seat 201, the second inclined surface is formed on the side of the mounting seat 201 opposite to the push rod 302, and the first inclined surface is formed on the push rod 302. This structure is simple and easy to implement.

[0055] Furthermore, the difference from the embodiment 1 is that the mounting seat 201 is provided with a guide slot 6, and the knife seat assembly 1 is provided with a slider 7 that slidably cooperates with the guide slot 6. This arrangement is conducive to improving the stability of the movement of the discharge assembly 2.

[0056] Furthermore, the difference from the embodiment 1 is that an elastic member 8 is provided in the guide slot 6 to elastically press the mounting seat 201 toward the push rod 302. This arrangement is conducive to the reset of the discharge assembly 2 and can prevent the discharge assembly 2 from moving excessively.

[0057] Furthermore, the difference from Example 1 is that two first positioning rods 9 are provided on the knife seat assembly 1, and the two first positioning rods 9 are arranged opposite to each other on the left and right sides of the moving direction of the discharge assembly 2. This arrangement is conducive to improving the stability of the movement of the discharge assembly 2.

[0058] Furthermore, the difference between the embodiment 1 and the embodiment 1 is that two second positioning rods 10 are provided on the knife seat assembly 1, and the two second positioning rods 10 are arranged opposite to each other in the swing direction of the push rod 302. This arrangement can prevent the push rod 302 from swinging excessively.

[0059] Furthermore, the difference between it and the embodiment 1 is that the number of the brush 122 is one, the brush 122 is sleeved on the metal sleeve 121, and the connecting and pressing member 131 is clamped with the brush 122. This structure is simple and easy to implement.

[0060] Furthermore, the difference from Example 1 is that the knife handle 102 is formed with a first wire through hole 14 extending along its axial direction, the knife base 101 is formed with a second wire through hole 15 communicating with the first wire through hole 14, and the knife base 101 is provided with a plurality of first lead grooves 16 communicating with the second wire through hole 15. This structure facilitates the lead-out and storage of the wires, making the overall structure more compact.

[0061] It should be understood that the terms "first", "second", etc. are used in this application to describe various information, but this information should not be limited to these terms, and these terms are only used to distinguish the same type of information from each other. For example, without departing from the scope of this application, the "first" information may also be referred to as the "second" information, and similarly, the "second" information may also be referred to as the "first" information. In addition, the terms "center of a circle", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, rather than indicating or implying 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 this application.

[0062] As described above, one or more implementation methods are provided in combination with specific contents, and the specific implementation of this application is not limited to these descriptions. Any similarity or similarity with the method, structure, etc. of this application, or some technical deductions or replacements made based on the concept of this application should be considered as the protection scope of this application.

Claims

1. An electric discharge milling composite tool with an electric discharge compensation gap, comprising a tool holder assembly (1), characterized in that: The tool holder assembly (1) is provided with a discharge assembly (2) and a gap compensation mechanism (3); the discharge assembly (2) is used to discharge to the surface of a workpiece; when the gap between the discharge assembly (2) and the workpiece surface is greater than or less than the discharge gap, the gap compensation mechanism (3) drives the discharge assembly (2) to move so that the discharge assembly (2) moves to a position where the gap between the discharge assembly (2) and the workpiece surface is equal to the discharge gap; the gap compensation mechanism (3) comprises a piezoelectric assembly (301) and a push rod (302) that swings under the drive of the piezoelectric assembly (301); when the push rod (302) swings, the discharge assembly (2) moves. The piezoelectric component (301) comprises a fixing seat (3011) arranged on the knife seat component (1) and a piezoelectric ceramic (3012) arranged on the fixing seat (3011); the push rod (302) is formed with an elastic portion (3021) connected to the fixing seat (3011) and a first pushing portion (3022) abutting against the telescopic end of the piezoelectric ceramic (3012); the discharge component (2) is connected to the push rod (302); the elastic portion (3021), the first pushing portion (3022), the push rod (302) and the fixing seat (3011) are integrally formed.

2. The discharge milling composite tool with discharge compensation gap according to claim 1, characterized in that: The knife seat assembly (1) is sleeved with an insulating sleeve (11) that can rotate relative to the knife seat assembly, and a plurality of conductive assemblies (12) are fixedly mounted on the insulating sleeve (11). The plurality of conductive assemblies (12) are connected via a connecting assembly (13).

3. The discharge milling composite tool with discharge compensation gap according to claim 2, characterized in that: The conductive component (12) comprises a metal sleeve (121) sleeved on the insulating sleeve (11) and a brush (122) arranged on the metal sleeve (121); the connecting component (13) comprises a plurality of connecting clamping members (131) and a connecting rod (132) connecting the plurality of connecting clamping members (131); the connecting clamping members (131) are connected to the brush (122).

4. The discharge milling composite tool with discharge compensation gap according to claim 3 is characterized in that: The tool holder assembly (1) is provided with a tool (4) for cutting a workpiece, an insulating assembly (5) is provided between the tool (4) and the tool holder assembly (1), and the insulating assembly (5) comprises an insulating sheet (51) provided between the tool (4) and the tool holder assembly (1) and an insulating fastener (52) connecting the tool (4), the insulating sheet (51) and the tool holder assembly (1).

5. An electric discharge milling composite tool with an electric discharge compensation gap, comprising a tool holder assembly (1), characterized in that: The tool holder assembly (1) is provided with a discharge assembly (2) and a gap compensation mechanism (3). The discharge assembly (2) is used to discharge to the surface of a workpiece. When the gap between the discharge assembly (2) and the workpiece surface is greater than or less than the discharge gap, the gap compensation mechanism (3) drives the discharge assembly (2) to move so that the discharge assembly (2) moves to a position where the gap between the discharge assembly (2) and the workpiece surface is equal to the discharge gap. The gap compensation mechanism (3) comprises a piezoelectric assembly (301) and a push rod (302) that swings under the drive of the piezoelectric assembly (301). When the push rod (302) swings, the discharge assembly (2) moves. The piezoelectric assembly (301) comprises a push rod (302) that is arranged on the tool holder assembly (1). A fixed seat (3011) and a piezoelectric ceramic (3012) arranged on the fixed seat (3011); a hinge portion (3023) hinged to the tool holder assembly (1) and a second push portion (3024) abutting against the telescopic end of the piezoelectric ceramic (3012) are formed on the push rod (302); when the push rod (302) swings, it pushes the discharge assembly (2) obliquely so that the discharge assembly (2) moves toward the workpiece; a first inclined surface is provided on the side of the push rod (302) opposite to the piezoelectric assembly (301); a second inclined surface is provided on the piezoelectric assembly (301) to be obliquely pushed with the first inclined surface; the oblique pushing design enables the piezoelectric ceramic (3012) to be arranged on a diagonal line.

6. The discharge milling composite tool with discharge compensation gap according to claim 5, characterized in that: The discharge assembly (2) comprises a mounting seat (201) that can slide relative to the knife seat assembly (1) and an electrode sheet (202) disposed in the mounting seat (201); one of the knife seat assembly (1) and the mounting seat (201) is provided with a guide groove (6), and the other of the two is provided with a slider (7) that slidably cooperates with the guide groove (6).

7. The discharge milling composite tool with discharge compensation gap according to claim 6, characterized in that: An elastic member (8) is provided in the guide slot (6) for elastically pressing the mounting seat (201) in the direction of the push rod (302).

8. The discharge milling composite tool with discharge compensation gap according to claim 5, characterized in that: The knife seat assembly (1) is sleeved with an insulating sleeve (11) that can rotate relative to the knife seat assembly, and a plurality of conductive assemblies (12) are fixedly mounted on the insulating sleeve (11). The plurality of conductive assemblies (12) are connected via a connecting assembly (13).

9. The discharge milling composite tool with discharge compensation gap according to claim 8, characterized in that: The conductive component (12) comprises a metal sleeve (121) sleeved on the insulating sleeve (11) and a brush (122) arranged on the metal sleeve (121); the connecting component (13) comprises a plurality of connecting clamping members (131) and a connecting rod (132) connecting the plurality of connecting clamping members (131); the connecting clamping members (131) are connected to the brush (122).

10. The discharge milling composite tool with discharge compensation gap according to claim 5, characterized in that: The tool holder assembly (1) is provided with a tool (4) for cutting a workpiece, an insulating assembly (5) is provided between the tool (4) and the tool holder assembly (1), and the insulating assembly (5) comprises an insulating sheet (51) provided between the tool (4) and the tool holder assembly (1) and an insulating fastener (52) connecting the tool (4), the insulating sheet (51) and the tool holder assembly (1).

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