A milling device for processing a control block of a commercial vehicle transmission

Abstract

This invention belongs to the field of milling equipment technology, and relates to a milling machine for machining control blocks of commercial vehicle transmissions. It includes a machine tool body; a thermoelectric monitoring component electrically connected between the cutting tool and the workpiece, configured to acquire in real time the dynamic signal of the thermoelectric potential generated by friction between dissimilar metals in the cutting contact area; a fluid intervention component having a fluid output end pointing towards the cutting contact area, and configured to controllably switch between a cooling medium and a chilling medium; and a controller communicatively connected to both the thermoelectric monitoring component and the fluid intervention component. This effectively prevents adhering material from further evolving into built-up edge, ensuring the integrity of the machined surface of the transmission control block.

Description

Technical Field

[0001] This invention belongs to the field of milling equipment technology, specifically relating to a milling equipment for machining control blocks of commercial vehicle transmissions. Background Technology

[0002] As the core hub of the hydraulic shifting system in heavy-duty vehicles, the transmission control block of commercial vehicles integrates valve ports and oil passages. In the manufacturing of modern intelligent transportation equipment, such control blocks are typically made of high-silicon cast aluminum or die-cast aluminum alloys, and the sealing roughness requirements for their mating surfaces are extremely high. In actual CNC milling automation engineering, due to the extremely high affinity and ductility of aluminum alloy materials, under the high temperature and pressure generated by high-speed cutting, the rake face of the tool is extremely prone to severe cold welding and adhesive wear, i.e., built-up edge. The periodic growth and tearing off of the built-up edge can instantly scratch the precision-machined surface of the control block, causing the already expensive workpiece to be scrapped directly. Summary of the Invention

[0003] To address the aforementioned technical problems, this invention provides a milling machine for machining control blocks of commercial vehicle transmissions.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0005] A milling machine for machining a transmission control block in a commercial vehicle is provided, comprising:

[0006] Machine tool body;

[0007] The thermoelectric monitoring component is electrically connected between the tool and the workpiece and is configured to acquire in real time the dynamic signal of the thermoelectric potential generated by the friction between dissimilar metals in the cutting contact area between the tool and the workpiece.

[0008] The fluid intervention component has a fluid output end pointing to the cutting contact area and is configured to controllably switch between a cooling medium and a quenching medium for output.

[0009] The controller is communicatively connected to both the thermoelectric monitoring component and the fluid intervention component.

[0010] The controller, based on the transient change characteristics of the thermoelectric potential dynamic signal, determines when the tool is in a material adhesion formation state and outputs an intervention command to the fluid intervention component to drive the fluid intervention component to cut off the cooling medium and spray the quenching medium into the cutting contact area.

[0011] Preferably, the thermoelectric monitoring component includes:

[0012] Electrical isolation components are installed at the clamping and assembly interface between the spindle and the cutting tool of the machine tool body to block the conductive path of the cutting tool to ground through the spindle.

[0013] The voltage acquisition circuit has two probes electrically connected to a stationary workpiece and a non-cutting part of a rotating and isolated cutting tool, respectively.

[0014] Preferably, the electrical isolation component includes:

[0015] A ceramic insulating sleeve is disposed between the tool holder of the spindle and the tool clamping interface; or, a zirconium oxide insulating and wear-resistant coating is attached to the outer connecting surface of the tool holder of the spindle.

[0016] The voltage acquisition circuit is electrically connected to the cutting tool via a conductive slip ring.

[0017] Preferably, the conductive slip ring comprises:

[0018] The rotating conductive ring is coaxially fixed to the outer cylindrical surface of the spindle tool holder and maintains an electrical connection with the tool.

[0019] A stationary brush assembly, mounted on the stationary housing of the machine tool body, includes carbon brushes and elastic clamping components;

[0020] The elastic clamping element causes the end of the carbon brush to continuously abut against and rub against the outer surface of the rotating conductive ring.

[0021] Preferably, the logic for the controller to determine the transient change characteristic includes:

[0022] The low-frequency envelope slope of the thermoelectric potential dynamic signal is extracted. When the slope continuously increases and reaches a preset saturation threshold, it is determined that the adhesion incubation state is in progress.

[0023] In the adhesion and incubation state, the high-frequency fluctuation variance or first derivative of the thermoelectric potential dynamic signal is extracted simultaneously.

[0024] Specifically, when the high-frequency fluctuation variance or first derivative exceeds a preset mutation threshold, it is confirmed that the tool is in the material adhesion generation state, and the intervention command is triggered.

[0025] Preferably, the voltage acquisition circuit is connected in series with a signal conditioning module:

[0026] The signal conditioning module includes a differential isolation amplifier and an anti-aliasing filter that are electrically connected in sequence.

[0027] The anti-aliasing filter is configured with a cutoff frequency to filter out the PWM high-frequency chopping noise generated by the spindle motor before calculating the first derivative.

[0028] Preferably, the fluid intervention component includes:

[0029] The first flow channel assembly is used to convey the cooling medium;

[0030] The second flow channel assembly, independent of the first flow channel assembly, is used to deliver the quenching medium;

[0031] And a first control valve and a second control valve respectively disposed at the liquid inlet end of the first flow channel assembly and the second flow channel assembly, wherein the first control valve and the second control valve are electrically connected to the controller.

[0032] Preferably, the first flow channel assembly includes:

[0033] The fluid inlet channel runs through the inside of the tool, and its inlet is connected to the central water outlet of the spindle.

[0034] The return fluid channel is located inside the cutting tool and connects to the end of the inlet fluid channel. Its outlet is connected back to the circulation and recovery pipeline of the machine tool body.

[0035] Preferably, the second flow channel assembly includes:

[0036] A ring frame is coaxially sleeved outside the cutter, and an annular flow channel and a spray port connected to the annular flow channel are opened inside it;

[0037] A drive unit is connected between the ring frame and the spindle end of the machine tool body, and is used to controllably drive the ring frame to translate along the axial direction of the tool.

[0038] Preferably, the specific execution steps of the intervention instruction include:

[0039] The control drive unit drives the ring frame to extend downward along the axis, so that the injection nozzle is close to the cutting contact area;

[0040] Simultaneously close the first control valve and open the second control valve to spray the chilling medium into the cutting contact area within the preset extreme cold impact time window;

[0041] After the time window ends, the second control valve is closed, the first control valve is re-opened, and the drive unit is controlled to drive the ring frame to move upward along the axis and return to the avoidance position.

[0042] This invention provides a milling machine for machining control blocks of commercial vehicle transmissions. The beneficial effects of this invention are as follows:

[0043] The transient extreme low temperature brought by the chilling medium causes the nascent adhesive material to undergo thermodynamic shrinkage and embrittlement, thereby peeling it off from the cutting edge surface under the synergistic effect of mechanical cutting force. This effectively prevents the adhesive material from further evolving into built-up edge and ensures the integrity of the machined surface of the transmission control block. Attached Figure Description

[0044] Figure 1This is a front view of the milling equipment for machining the control block of a commercial vehicle transmission proposed in this invention;

[0045] Figure 2 This is one of the spindle sectional views of the milling equipment for machining the control block of a commercial vehicle transmission proposed in this invention;

[0046] Figure 3 This is a second sectional view of the spindle of the milling equipment for machining the control block of a commercial vehicle transmission proposed in this invention.

[0047] Figure 4 This is the third sectional view of the spindle of the milling equipment for machining the control block of a commercial vehicle transmission proposed in this invention;

[0048] Figure 5 for Figure 4 A magnified view of a portion of the structure shown at point A;

[0049] Figure 6 This is a schematic diagram of the structure of the second flow channel assembly in the milling equipment for machining the control block of a commercial vehicle transmission proposed in this invention;

[0050] Figure 7 This is a schematic diagram of the control process of the milling equipment for machining the control block of a commercial vehicle transmission proposed in this invention.

[0051] Explanation of reference numerals in the attached figures:

[0052] 1. Machine tool body; 201. Electrical isolation component; 202. Voltage acquisition circuit; 203. Rotating conductive ring; 204. Stationary brush assembly; 2041. Carbon brush; 2042. Elastic clamping component; 3. Fluid intervention assembly; 301. First flow channel assembly; 302. Second flow channel assembly; 3021. Ring frame; 3022. Drive component; 4. Cutting tool. Detailed Implementation

[0053] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0054] Please see Figures 1-7 As shown, the specific embodiments provided by the present invention are as follows:

[0055] like Figure 1 , Figure 2 and Figure 7As shown, an embodiment of the present invention proposes a milling device for machining control blocks of commercial vehicle transmissions, including a machine tool body 1, which serves as a platform for the entire machining process. During the milling operation performed by the machine tool body 1, an electrical connection is established between the cutting tool 4 and the workpiece through a thermoelectric monitoring component. This thermoelectric monitoring component utilizes the natural thermoelectric effect generated when the material of the cutting tool 4 and the material of the workpiece, such as aluminum alloy commonly used in commercial vehicle control blocks, undergoes intense friction in the cutting contact area to capture the dynamic signal of the thermoelectric potential fluctuating with the machining state in real time. This signal directly reflects the changes in the physical properties of the interface between the cutting edge and the metal material.

[0056] To enable intervention in the machining process, this embodiment also includes a fluid intervention component 3. The fluid output end of this fluid intervention component 3 is directional, ensuring that the ejected medium covers the cutting contact area. Furthermore, the fluid intervention component 3 can switch between a conventional cooling medium and a cryogenic medium with extremely low temperature characteristics according to instructions.

[0057] Specifically, the controller maintains communication connections with both the thermoelectric monitoring component and the fluid intervention component 3. During the machining process, the controller continuously receives and analyzes the dynamic thermoelectric potential signals from the thermoelectric monitoring component. When the controller identifies transient change characteristics in the signal that conform to a specific pattern, it determines that the cutting edge of the tool 4 has shown a microscopic tendency for material cold welding or adhesion, i.e., it is in a state of material adhesion formation.

[0058] Once the determination is valid, the controller immediately sends an intervention command to the fluid intervention component 3. Responding to the command, the fluid intervention component 3 quickly cuts off the current circulating base cooling medium and instead precisely sprays a chilling medium into the cutting contact area. The transient extreme low temperature brought by the chilling medium causes the nascent adhering material to undergo thermodynamic contraction and embrittlement, thereby peeling it off from the cutting edge surface under the synergistic effect of mechanical cutting forces. This effectively prevents the adhering material from further evolving into built-up edge, ensuring the integrity of the machined surface of the transmission control block.

[0059] In a preferred embodiment, an electrical isolation component 201 is provided at the clamping and assembly interface between the spindle of the machine tool body 1 and the cutting tool 4. Since a conventional machine tool spindle is connected to the machine body via bearings and is grounded, without isolation, the thermoelectric potential signal generated by the cutting tool 4 would rapidly flow through the spindle to ground, causing severe signal attenuation or a short circuit. This electrical isolation component 201, through physical insulation, disconnects the cutting tool 4 from the spindle's grounding path, forming a relatively independent potential node.

[0060] The voltage acquisition circuit 202, which is matched with it, is the core unit for signal pickup. Its two probe ends are connected in an asymmetrical manner: one probe end is electrically connected to the stationary workpiece, and a stable reference potential is usually established by utilizing the conductivity of the workpiece itself or by using a fixture; the other probe end is pointed to the cutting tool 4, which is in a high-speed rotating state and has been electrically isolated.

[0061] To avoid interference with the cutting operation during the acquisition process and to protect the probe from the high temperature and chips of the cutting process, the probe of the voltage acquisition circuit 202 is connected to a non-cutting part of the tool 4, such as the rear of the tool holder or the assembly auxiliary surface. This utilizes the potential difference environment created by the isolation component while cleverly avoiding the area of ​​intense physical cutting, thus enabling the stable extraction of the thermoelectric potential dynamic signal reflecting the state of the cutting interface during spindle rotation.

[0062] Specifically, the electrical isolation component 201 provides two parallel embodiments:

[0063] The first embodiment employs a ceramic insulating sleeve. This ceramic insulating sleeve is embedded and positioned between the tool holder of the spindle and the clamping interface of the cutting tool 4. Ceramic materials, such as silicon nitride or alumina ceramics, possess extremely high insulation resistance and compressive strength, enabling them to withstand the enormous radial and axial cutting forces during milling. Through this bushing-type physical isolation, the cutting tool 4 is secured within the tool holder but electrically completely disconnected from both the tool holder and the spindle.

[0064] The second embodiment employs a zirconia insulating and wear-resistant coating. This coating is applied directly to the outer connecting surface of the spindle tool holder via thermal spraying or vapor deposition. Zirconia not only possesses excellent electrical insulation properties but also exhibits near-metallic toughness and excellent wear resistance. This coating solution does not require alteration to the original mechanical assembly structure; by forming an insulating film at the contact interface, it achieves extremely compact electrical isolation, making it particularly suitable for high-speed spindle systems with limited installation space.

[0065] Correspondingly, the rotating end of the conductive slip ring rotates synchronously with the energized part of the tool holder or tool 4, while its stationary end, typically a brush assembly, is fixed to a stationary part of the machine tool body 1. Even at high speeds of thousands of revolutions per minute for the tool 4, the conductive slip ring can continuously conduct the thermal potential from the side of the tool 4 through physical contact and transmit it to the external voltage acquisition circuit 202, thereby ensuring the continuity and integrity of signal transmission.

[0066] like Figure 5As shown, more specifically, a carbon brush 2041 type conductive slip ring structure is adopted. Specifically, the rotating conductive ring 203 is made of a highly conductive metal material, such as copper or brass, and is coaxially fixed to the outer cylindrical surface of the non-machined area of ​​the spindle tool holder. Through the internally embedded compensating wire or the conductive path of the tool holder itself, the rotating conductive ring 203 maintains electrical communication with the insulated tool 4, thereby guiding the thermoelectric potential generated by the tool tip to the rotating interface on the surface of the tool holder.

[0067] Matching this is a stationary brush assembly 204 fixedly mounted on the stationary housing of the machine tool body 1. This assembly integrates a highly wear-resistant carbon brush 2041 and an elastic clamping element 2042, such as a compression spring. During machining, even when the spindle is rotating at a high speed of several thousand revolutions per minute, the elastic clamping element 2042 provides constant compensating pressure, ensuring that the tip of the carbon brush 2041 maintains close contact and friction with the outer surface of the rotating conductive ring 203.

[0068] Through this stable physical contact channel, the thermoelectric potential dynamic signal can be transmitted across the mechanical rotation interface and continuously transmitted to the subsequent voltage acquisition circuit 202, providing a real and continuous data basis for determining the material adhesion state.

[0069] Preferably, the cutting tool 4 is made of a cemented carbide material with good thermal shock resistance, such as a grade with a high cobalt content, to adapt to the instantaneous temperature difference caused by the jetting of the cooling medium.

[0070] In a preferred embodiment, the controller first performs real-time envelope extraction on the acquired thermoelectric potential dynamic signal, focusing on its low-frequency envelope slope. During the normal stable cutting phase, the thermoelectric potential signal rises slowly with the wear of the tool 4, and its slope remains within a stable range. However, when metal affinity and initial adhesion begin to appear on the cutting edge surface, the thermoelectric potential signal exhibits a significant trend drift due to the nonlinear increase in the friction coefficient. The controller calculates this slope in real time through a sliding time window. Once it detects that the slope shows a continuous nonlinear increase and the cumulative value approaches a preset subcritical saturation threshold, it determines that the tool 4 is currently in an adhesion incubation state. At this time, the material has not yet formed a macroscopic built-up edge, but it already possesses the physical basis for a sudden change.

[0071] Once the adhesion incubation state is confirmed, the controller immediately initiates feature extraction at a higher sampling frequency, specifically real-time monitoring of the high-frequency fluctuation variance or first derivative of the thermoelectric potential dynamic signal. When the signal in the incubation period further exhibits violent oscillations of high-frequency fluctuations, such as a surge in variance or a change in the instantaneous rate of signal, such as the first derivative exceeding a preset abrupt change threshold, it means that the microstructure of the adhesion material has undergone a collapse-like growth or structural reorganization, thus confirming that the tool 4 is officially in the material adhesion generation state.

[0072] Based on this, the controller can effectively eliminate single signal noise caused by cutting depth fluctuations or impacts from hard material points, ensuring that intervention commands are triggered only before the actual built-up edge causes irreversible damage to the surface quality of the transmission control block, greatly improving the sensitivity and decision-making accuracy of the monitoring system.

[0073] In a preferred embodiment, the voltage acquisition circuit 202 integrates a signal conditioning module to ensure that the characteristic data input to the controller has extremely high fidelity.

[0074] Because the processing environment of commercial vehicle transmission control blocks is subject to a large amount of high-frequency electromagnetic interference, especially the strong PWM (Pulse Width Modulation) high-frequency chopping noise generated by the frequency converter driver of the machine tool spindle motor, the frequency of this noise often overlaps with the frequency of the microscopic abrupt signal during material adhesion. Therefore, the signal conditioning module of this embodiment includes:

[0075] A differential isolation amplifier, with its input connected between the isolated tool 4 and the workpiece, effectively cancels out spatial common-mode interference signals induced during spindle rotation by utilizing the high common-mode rejection ratio of the differential amplifier circuit. Simultaneously, the isolation function ensures complete electrical decoupling between the measurement circuit and the high-voltage circuitry of the machine tool spindle drive system, preventing ground loop current from absorbing the millivolt-level thermoelectric potential signal and initially extracting the pure original voltage difference.

[0076] And an anti-aliasing filter, which is configured with a precise cutoff frequency. This cutoff frequency is set according to the carrier frequency of the spindle motor and the sampling theorem, and its core function is to pre-filter out high-frequency chopper harmonics and spurious noise before the controller performs calculations of high-frequency characteristics such as the first derivative.

[0077] This allows the thermoelectric potential dynamic signal acquired by the controller to accurately reflect the changes in the physical properties of the cutting contact area, avoiding algorithm misjudgments caused by electromagnetic noise, and providing a high signal-to-noise ratio data source for the accurate identification of the subsequent adhesion incubation state.

[0078] In a preferred embodiment, the first flow channel assembly 301 is used to deliver a basic cooling medium at room temperature or low temperature, such as cutting oil or water-based coolant, and is responsible for maintaining the thermal balance between the tool 4 and the workpiece under normal cutting conditions. The second flow channel assembly 302, which runs parallel to the first flow channel assembly 301, is completely independent of the first flow channel assembly 301 and is specifically used to deliver a quenching medium with extreme low temperature characteristics, such as liquid nitrogen.

[0079] A first control valve and a second control valve are respectively configured at the liquid inlet ends of the first flow channel assembly 301 and the second flow channel assembly 302. Both control valves are electrically connected to the controller via signal lines. In the actual operation process, the controller makes decisions based on real-time signals fed back by the thermoelectric monitoring component. When it is determined that the tool 4 is in a normal processing state, the controller keeps the first control valve open and the second control valve closed. At this time, the equipment only outputs basic cooling medium for lubrication and cooling. Once material adhesion is detected, the controller drives the first control valve to close instantaneously to cut off the normal fluid through a preset logic sequence, and simultaneously opens the second control valve.

[0080] Since the first flow channel assembly 301 and the second flow channel assembly 302 are independent of each other in the pipeline, this switching process greatly avoids heat exchange loss between the quenching medium and the basic cooling medium during transportation.

[0081] like Figure 4 As shown, in a preferred embodiment, the first flow channel assembly 301 includes a liquid inlet channel that extends axially through the interior of the tool 4. Its physical inlet is sealed and connected to the central water outlet of the spindle via the tool holder interface. During machining, the basic cooling medium is pressurized and enters the center of the tool 4, directly reaching the core area of ​​cutting heat near the cutting edge.

[0082] It also includes a return flow channel. This return flow channel is physically connected to the end of the inlet flow channel at the heat exchange chamber of the tool head 4, forming a complete U-shaped or annular internal loop. When the base cooling medium flows through this end connection, it carries away the heat accumulated on the cutting edge through heat exchange, and then flows back to the tool holder end along the return flow channel.

[0083] The outlet of the return flow channel is ultimately connected back to the circulation and recovery pipeline of the machine tool body 1, realizing zero overflow recovery of coolant.

[0084] like Figure 6 As shown, in a preferred embodiment, to ensure that the cooling medium reaches the cutting contact area via the shortest path without interfering with the normal milling chip removal process, the second flow channel assembly 302 includes an annular frame 3021, which is coaxially fitted into the external space of the tool 4, and its inner wall maintains a preset safety clearance with the rotating tool holder or tool body. The annular frame 3021 has a closed annular flow channel formed inside, which is connected to the second control valve via a flexible high-pressure hose. At the bottom of the annular flow channel, multiple injection ports are evenly distributed circumferentially, and the axes of these injection ports are obliquely pointed towards the cutting contact area where the tool tip is located.

[0085] Furthermore, the drive component 3022, such as a cylinder, linear motor, or electromagnetic push rod, is connected between the ring frame 3021 and the spindle end of the machine tool body 1. Under the unified scheduling of the controller, the drive component 3022 can controllably drive the ring frame 3021 to perform translational movement along the axial direction of the tool 4.

[0086] During the basic machining stage, the drive unit 3022 remains retracted, pulling the ring holder 3021 to a clearance position near the end of the spindle. This arrangement ensures that the ring holder 3021 does not obstruct the cutting trajectory of the end mill in deep holes or narrow cavities, while also protecting the ejector from clogging by splashing chips.

[0087] When the controller determines that the tool 4 is in a state of material adhesion formation, the drive unit 3022 quickly responds to the intervention command, driving the ring frame 3021 to extend axially downwards until the injection port is close to the cutting contact area. Subsequently, the cooling medium is ejected from multiple injection ports through the annular flow channel.

[0088] like Figure 2 and Figure 3 As shown, in this embodiment, when the thermoelectric monitoring component detects a sudden change in electrical signal that matches adhesion characteristics, the controller immediately initiates the following intervention logic:

[0089] First, a pose switching action is performed. The controller drives the drive component 3022 to move, guiding the ring frame 3021 to overcome the reset spring force or extend axially along the guide rail. Through this close-range pose locking, the ejected cooling medium can obtain higher momentum, thereby more effectively penetrating the high-pressure air barrier generated by the high-speed rotating tool 4 and directly acting on the tool surface where adhesion occurs.

[0090] Secondly, as the annular frame 3021 is in position, the controller closes the first control valve to pause the circulation of the basic cooling medium in the first flow channel and opens the second control valve. At this time, the quenching medium is pressurized and flows through the annular flow channel, being sprayed from the injection port into the cutting contact area in the form of a jet.

[0091] The injection process is strictly limited to a preset ultra-low temperature shock time window, for example, 0.5 to 2 seconds. Since the supply of room temperature medium has been cut off in the first flow channel, and residual heat from machining still accumulates inside the tool 4, the injection of the external ultra-low temperature chilling medium causes the aluminum alloy material adhering to the cutting edge to undergo a sudden and severe thermal stress impact. Under this extreme temperature gradient, the adhesive layer undergoes brittle shrinkage and generates micro-cracks. Under the huge cutting force impact during milling, the adhesive material will quickly break off from the cutting edge substrate.

[0092] Finally, when the time window ends, the controller immediately closes the second control valve and reopens the first control valve, restoring the closed internal cooling cycle within the first flow channel. Subsequently, the drive unit 3022 drives the annular frame 3021 to move axially upwards and back to its initial clearance position.

[0093] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A milling machine for machining control blocks of commercial vehicle transmissions, characterized in that, include: Machine tool body; The thermoelectric monitoring component is electrically connected between the tool and the workpiece and is configured to acquire in real time the dynamic signal of the thermoelectric potential generated by the friction between dissimilar metals in the cutting contact area between the tool and the workpiece. The fluid intervention component has a fluid output end pointing to the cutting contact area and is configured to controllably switch between a cooling medium and a quenching medium for output. The controller is communicatively connected to both the thermoelectric monitoring component and the fluid intervention component. The controller, based on the transient change characteristics of the thermoelectric potential dynamic signal, determines when the tool is in a material adhesion formation state and outputs an intervention command to the fluid intervention component to drive the fluid intervention component to cut off the cooling medium and spray the quenching medium into the cutting contact area.

2. The milling equipment for machining the control block of a commercial vehicle transmission according to claim 1, characterized in that, The thermoelectric monitoring component includes: Electrical isolation components are installed at the clamping and assembly interface between the spindle and the cutting tool of the machine tool body to block the conductive path of the cutting tool to ground through the spindle. The voltage acquisition circuit has two probes electrically connected to a stationary workpiece and a non-cutting part of a rotating and isolated cutting tool, respectively.

3. The milling equipment for machining the control block of a commercial vehicle transmission according to claim 2, characterized in that, The electrical isolation component includes: A ceramic insulating sleeve is disposed between the tool holder of the spindle and the tool clamping interface; or, a zirconium oxide insulating and wear-resistant coating is attached to the outer connecting surface of the tool holder of the spindle. The voltage acquisition circuit is electrically connected to the cutting tool via a conductive slip ring.

4. The milling equipment for machining the control block of a commercial vehicle transmission according to claim 3, characterized in that, The conductive slip ring includes: The rotating conductive ring is coaxially fixed to the outer cylindrical surface of the spindle tool holder and maintains an electrical connection with the tool. A stationary brush assembly, mounted on the stationary housing of the machine tool body, includes carbon brushes and elastic clamping components; The elastic clamping element causes the end of the carbon brush to continuously abut against and rub against the outer surface of the rotating conductive ring.

5. The milling equipment for machining the control block of a commercial vehicle transmission according to any one of claims 1 to 4, characterized in that, The logic by which the controller determines the transient change characteristic includes: The low-frequency envelope slope of the thermoelectric potential dynamic signal is extracted. When the slope continuously increases and reaches a preset saturation threshold, it is determined that the adhesion incubation state is in progress. In the adhesion and incubation state, the high-frequency fluctuation variance or first derivative of the thermoelectric potential dynamic signal is extracted simultaneously. Specifically, when the high-frequency fluctuation variance or first derivative exceeds a preset mutation threshold, it is confirmed that the tool is in the material adhesion generation state, and the intervention command is triggered.

6. The milling equipment for machining the control block of a commercial vehicle transmission according to claim 2, characterized in that, The voltage acquisition circuit is connected in series with a signal conditioning module: The signal conditioning module includes a differential isolation amplifier and an anti-aliasing filter that are electrically connected in sequence. The anti-aliasing filter is configured with a cutoff frequency to filter out the PWM high-frequency chopping noise generated by the spindle motor before calculating the first derivative.

7. The milling equipment for machining the control block of a commercial vehicle transmission according to claim 1, characterized in that, The fluid intervention component includes: The first flow channel assembly is used to convey the cooling medium; The second flow channel assembly, independent of the first flow channel assembly, is used to deliver the quenching medium; And a first control valve and a second control valve respectively disposed at the liquid inlet end of the first flow channel assembly and the second flow channel assembly, wherein the first control valve and the second control valve are electrically connected to the controller.

8. The milling equipment for machining the control block of a commercial vehicle transmission according to claim 7, characterized in that, The first flow channel component includes: The fluid inlet channel runs through the inside of the tool, and its inlet is connected to the central water outlet of the spindle. The return fluid channel is located inside the cutting tool and connects to the end of the inlet fluid channel. Its outlet is connected back to the circulation and recovery pipeline of the machine tool body.

9. The milling equipment for machining the control block of a commercial vehicle transmission according to claim 7, characterized in that, The second flow channel assembly includes: A ring frame is coaxially sleeved outside the cutter, and an annular flow channel and a spray port connected to the annular flow channel are opened inside it; A drive unit is connected between the ring frame and the spindle end of the machine tool body, and is used to controllably drive the ring frame to translate along the axial direction of the tool.

10. The milling equipment for machining the control block of a commercial vehicle transmission according to claim 9, characterized in that, The specific steps for executing the intervention instruction include: The control drive unit drives the ring frame to extend downward along the axis, so that the injection nozzle is close to the cutting contact area; Simultaneously close the first control valve and open the second control valve to spray the chilling medium into the cutting contact area within the preset extreme cold impact time window; After the time window ends, the second control valve is closed, the first control valve is re-opened, and the drive unit is controlled to drive the ring frame to move upward along the axis and return to the avoidance position.

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