A kind of automobile steering knuckle main pin hole drilling equipment

Abstract

The application discloses a kind of automobile steering knuckle main pin hole drilling equipment, it is related to drilling equipment technical field, including operation table and the clamping assembly of setting in operation table top;Still include: drill table, it is set with two and symmetrically distributed in the two sides of operation table;Feed assembly, in the top of two drill tables each set a group, for control fixedly connected in its movable end movable platform linear motion.The application is worn by the accurate perception and intelligent matching of two sides drill bit wear state by the structure of symmetrically arranged double drill table and rotary table, in combination with torque sensor real-time monitoring and data comparison component, the coaxiality precision and processing stability of main pin hole are effectively guaranteed when system detects that the difference of two sides torque exceeds threshold value by transverse comparison, can automatically select the pair of wear state closest from two sides alternative drill bit to switch, simultaneously, by longitudinal comparison to independently evaluate and early warning to each drill bit life, make full use of tool life.

Description

Technical Field

[0001] This invention relates to the field of drilling equipment technology, and specifically to a drilling equipment for kingpin holes in automotive steering knuckles. Background Technology

[0002] The steering knuckle, commonly known as the "steering knuckle," is a key safety component on the steering axle of a car. It connects to the axle through the kingpin holes on its upper and lower parts and drives the wheels to rotate, thereby realizing the steering function of the car. The machining accuracy of the kingpin holes, especially their coaxiality, hole diameter, and surface quality, directly determines the assembly accuracy of the kingpin and the sensitivity and reliability of the steering system, which is of paramount importance to driving safety.

[0003] Currently, the machining of kingpin holes in steering knuckles commonly employs a dual-axis synchronous drilling process. This process uses two symmetrically arranged CNC power heads that feed simultaneously from both sides of the steering knuckle, completing the drilling of the kingpin holes in one pass. Compared to single-axis sequential drilling, dual-axis synchronous drilling effectively avoids secondary clamping errors and theoretically better ensures the coaxiality of the upper and lower kingpin holes. Furthermore, because both sides are machined simultaneously, production efficiency is significantly improved. Despite these advantages, the dual-axis synchronous drilling process still has significant drawbacks:

[0004] This process places extremely high demands on the consistency of the drill bits used on both sides. This high requirement manifests in two main aspects: First, the wear of the drill bits themselves. When machining high-strength castings and forgings, drill bit wear is rapid, leading to increased cutting torque and affecting machining stability. Second, the difference in wear between the two drill bits affects the coaxiality of the kingpin hole and the quality of the hole wall. In actual production, due to subtle differences in tool material, microscopic condition of the cutting edge, and even cooling conditions, it is difficult to maintain a consistent wear rate between the two drill bits. This uneven wear leads to an imbalance in cutting forces on both sides, not only exacerbating machine tool vibration but also directly causing excessive coaxiality of the kingpin hole and deterioration of the hole wall surface quality. To control this risk, existing technologies often adopt a conservative strategy, which is to force replacement by strictly limiting the number of holes drilled by a single set of drill bits, attempting to replace them before the wear difference becomes too large. On the one hand, this approach results in a huge waste of the remaining tool life and increases production costs; on the other hand, since the tool condition cannot be monitored in real time, this strategy is still based on experience-based predictions, and the processing quality cannot be guaranteed to be stable. When there are fluctuations in material batches or abnormal working conditions, the scrap rate remains high. Summary of the Invention

[0005] The purpose of this invention is to provide a drilling device for kingpin holes in automotive steering knuckles, in order to solve the problems of uneven wear of drill bits on both sides leading to excessive coaxiality of the kingpin hole, insufficient tool life, and unstable quality and low production efficiency caused by reliance on manual experience in the existing dual-axis synchronous drilling process.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows:

[0007] A drilling device for kingpin holes in automotive steering knuckles includes an operating table and a clamping assembly mounted on top of the operating table; it also includes: two drill rigs symmetrically distributed on both sides of the operating table; a feed assembly, one set on top of each of the two drill rigs, used to control the linear movement of a movable platform fixedly connected to its movable end; a turntable rotatably connected to the top of the movable platform via a slewing bearing, the turntable's rotation position can be controlled by a switching structure, the top of the turntable has several mounting plates fixedly connected in a circular array at equal intervals, each mounting plate has a drive shaft rotatably connected to it, one end of the drive shaft is fixedly connected to a mounting head; drill bits are connected to the inside of the mounting heads by screws, each side of the turntable has one fewer drill bit than the number of mounting heads, and indicator lights are fixedly mounted on the mounting plates with drill bits; and a spindle motor. The drill bit is driven to rotate via a drive shaft; a torque sensor, mounted on the spindle motor, is used to collect the torque data of the drill bit during operation in real time; a data comparison component includes: a lateral comparison unit configured to calculate the real-time torque difference between the drill bits on both sides during operation; a longitudinal comparison unit configured to calculate the ratio of the current torque data of each drill bit to the initial torque reference value, as the torque change rate; a decision unit used to generate a tool matching command when the real-time torque difference exceeds a first preset threshold; and to generate a tool replacement command when the ratio exceeds a second preset threshold; a controller electrically connected to the data comparison component, the switching motor, and the indicator lights, controls the switching motor to rotate the turntable according to the tool matching command, selecting a pair of drill bits with the closest current wear state from the drill bits on both sides for operation.

[0008] By employing the aforementioned technical solution, a symmetrically arranged dual drill rig and rotary table structure, combined with real-time torque sensor monitoring and data comparison components, enables precise perception and intelligent matching of the wear status of drill bits on both sides. When the system detects that the torque difference between the two sides exceeds a threshold through lateral comparison, it can automatically select the pair with the closest wear status from the candidate drill bits on both sides for switching, effectively ensuring the coaxiality accuracy and machining stability of the kingpin hole. Simultaneously, through longitudinal comparison, the lifespan of each drill bit is independently assessed and warned, making full use of tool life while avoiding machining quality risks. The entire system significantly reduces manual intervention through multi-station automatic switching and intelligent decision-making, improving production efficiency while reducing tool wear and quality costs.

[0009] A further improvement of the technical solution of the present invention is that: the end of the drive shaft away from the mounting head extends through to the other side of the mounting plate and has a drive key; a slide rail is fixedly connected to the top of the movable platform and located inside the slewing bearing, a slider is slidably connected on the slide rail, a platform is fixedly connected to the top of the slider, a control mechanism for controlling the movement of the platform is provided on the top of the movable platform, the spindle motor is fixedly installed on the top of the platform, a drive joint is fixedly connected to the output end of the spindle motor, and a keyway for cooperating with the drive key is provided on the drive joint.

[0010] By adopting the above technical solution, a separable transmission connection structure is set between the mounting plate and the spindle motor, so that the spindle motor can remain stationary when the turntable switches positions, and the transmission connection and separation can be achieved by only a slight movement of the platform. This design significantly reduces the motion inertia and energy consumption during the switching process, improves the tool changing speed and positioning accuracy, and avoids the wear and failure risks caused by repeatedly dragging the motor cable and cooling pipe, greatly enhancing the long-term reliability and maintenance convenience of the equipment.

[0011] A further improvement of the technical solution of the present invention is that: the control mechanism includes a first fixed block fixedly connected to the top of the movable platform, a linkage block fixedly connected to the bottom of the platform, a slide rod slidably connected to the first fixed block, the slide rod passing through the first fixed block, an iron block fixedly connected to one end of the slide rod, and a linkage block fixedly connected to the other end, a retaining spring sleeved on the outside of the slide rod and located between the linkage block and the first fixed block, a second fixed block fixedly connected to the top of the movable platform, an electromagnet fixedly connected to the side of the second fixed block near the first fixed block, and the electromagnet and the iron block are used in conjunction.

[0012] By adopting the above technical solution, a key elastic buffer mechanism is introduced into the transmission docking process through the control scheme of using an electromagnet drive combined with a clamping spring reset. This design can not only quickly respond to achieve transmission separation, but also allow the transmission key and keyway to automatically slide into engagement by spring pressure when there is slight misalignment during reset, completely avoiding the risks of impact, tooth jamming or jamming caused by rigid drive, and greatly improving the success rate and reliability of docking.

[0013] A further improvement of the technical solution of the present invention is as follows: a rotary joint is rotatably connected to the outside of the transmission joint, and the rotary joint is fixedly connected to the housing of the spindle motor. The rotary joint has a first cavity inside, and an annular groove is formed in the middle of the inner side of the rotary joint. A second cavity is provided inside the transmission joint. Several connecting holes are formed in an annular array on the side wall of the transmission joint, and the connecting holes are used to connect the annular groove and the second cavity. A first through hole is formed in the middle of the transmission joint near the keyway, and a second through hole is formed in the middle of the transmission shaft. A water outlet is formed on the drill bit. The water outlet, the second through hole, and the first through hole are all connected to the second cavity. A water inlet is provided on the rotary joint, which is connected to the first cavity and is connected to an external coolant supply device. Sealing rings are provided at the connection points between the rotary joint and the transmission joint, the mating points between the transmission shaft and the transmission joint, and the connection points between the drill bit and the mounting head.

[0014] By adopting the above technical solution, an internal cooling system that rotates synchronously with the power transmission is constructed by integrating a coolant channel inside the transmission joint and coordinating a through-type design between the rotary joint, the transmission shaft, and the drill bit. This system can accurately deliver high-pressure coolant to the cutting edge of the drill bit while it is working, achieving efficient cooling and chip removal, significantly extending the service life of the drill bit and improving the quality of hole wall machining. Its compact integrated design avoids the entanglement and interference of external cooling pipes, perfectly adapts to the working mode of rotary table position switching, and the multi-layer sealing structure ensures zero leakage reliability of coolant under high-speed rotation and frequent switching conditions.

[0015] A further improvement to the technical solution of this invention is as follows: A connector is screwed into the interior of the mounting head without a drill bit. A nozzle is fixedly connected to one end of the connector. The nozzle is I-shaped, and a partition is fixedly connected inside the nozzle. A valve hole is provided on the partition. A distribution plate is rotatably connected to the partition and the nozzle near the connector. The distribution plate fits snugly against the partition and the nozzle cavity. An input hole is provided in the middle of the distribution plate near the connector, and a first output hole and a second output hole are provided on the side away from the connector. The first output hole and the second... The output holes are arranged radially; a first flushing hole is provided on the inner side of the nozzle near the connector; the distance from the first flushing hole to the nozzle axis is equal to the distance from the first output hole to the axis, and the distance from the valve hole to the nozzle axis is equal to the distance from the second output hole to the axis; a valve stem is rotatably connected to the inner side of the nozzle away from the connector, and one end of the central shaft of the distribution plate extends to the other side of the partition and is fixedly connected to the valve stem; a second flushing hole is provided on the inner side of the nozzle away from the connector; an adjustment structure for controlling the rotation of the valve stem is provided on the nozzle.

[0016] By adopting the above technical solution, a special nozzle with bidirectional cleaning function is set up. This nozzle adopts a unique dual-chamber structure, which can provide two different cleaning modes according to the opening status of the master pin hole: when the master pin hole is open, the coolant is sprayed forward from the flushing hole near the hole opening to push the chips out of the outlet; when it is a blind hole, the coolant is flushed backward from the flushing hole on the deep side to discharge the chips from the inlet. This directional cleaning mechanism effectively solves the technical problem that traditional unidirectional flushing pushes the chips into the hole when the hole is blocked, resulting in more serious accumulation.

[0017] A further improvement of the technical solution of the present invention is that: the adjustment structure includes a trigger rod slidably connected to the end of the nozzle, one end of the trigger rod is rotatably connected to a pad, and a reset groove is provided inside the valve rod. The reset groove includes two interconnected parts: a cylindrical groove and a prism groove. The side of the trigger rod away from the pad extends through the cylindrical groove into the interior of the prism groove and is rotatably connected to a prism block. The shape of the prism block matches that of the prism groove. A reset spring is fixedly connected between the prism block and one side of the inner wall of the prism groove. A spiral groove is provided on the inner wall of the cylindrical groove, and a sliding ball is fixedly connected to the side wall of the trigger rod. The sliding ball is slidably connected to the spiral groove.

[0018] By adopting the above technical solution and setting up a linkage mechanical triggering mechanism, the automatic identification and switching of cleaning modes is realized. When the nozzle extends into the blind hole and touches the hole wall, the mechanism can automatically trigger the valve stem to rotate and switch to the reverse flushing mode. In the open hole state, the default forward flushing mode is maintained. This identification mechanism based on physical contact does not require additional sensors and complex control, which not only ensures the reliability of mode switching, but also greatly reduces the system cost and complexity.

[0019] A further improvement of the technical solution of the present invention is that: the clamping assembly includes a positioning plate fixedly connected to the top of the operating table, and cylinders are fixedly connected to the top of the operating table and to both sides of the positioning plate. A pressure rod is hinged to the end of the piston rod of the cylinder. A support block is hinged to the top of the operating table. The top of the support block is hinged to the pressure rod. A pressure block is fixedly connected to the end of the pressure rod away from the cylinder. A placement groove is opened in the middle of the positioning plate, and a positioning ring is fixedly connected inside the placement groove. A positioning pin is fixedly connected to the top of the positioning plate.

[0020] By adopting the above technical solution and optimizing the specific structure of the clamping assembly, a fast and reliable workpiece positioning and clamping function is provided. The cylinder-driven articulated linkage mechanism can generate a stable and amplified clamping force to ensure that the steering knuckle does not shift or vibrate during the processing. At the same time, the combination of the positioning ring and the positioning pin realizes the precise positioning of the workpiece and effectively guarantees the processing accuracy of the main pin hole.

[0021] A further improvement of the technical solution of the present invention is that a wire brush is provided in the middle of the nozzle, and the wire brush, the first flushing hole and the second flushing hole are not on the same axis of the nozzle.

[0022] By adopting the above technical solution, an offset wire brush is set in the middle of the nozzle and cooperated with flushing holes in different directions to form a composite cleaning method that combines mechanical scraping and fluid flushing. The layout of the wire brush, the first flushing hole and the second flushing hole not being on the same axis allows for simultaneous scraping and flushing of different parts of the hole wall during the cleaning process, generating a vortex effect and significantly improving the cleaning effect on adhering chips.

[0023] By adopting the above technical solution, the technical effects achieved by this invention compared to the prior art are as follows:

[0024] 1. This invention provides a drilling device for kingpin holes in automotive steering knuckles. Through a symmetrically arranged dual drill table and turntable structure, combined with a torque sensor for real-time monitoring and data comparison, it achieves precise perception and intelligent matching of the wear state of the drill bits on both sides. When the system detects that the torque difference between the two sides exceeds a threshold through lateral comparison, it can automatically select the pair with the closest wear state from the candidate drill bits on both sides for switching, effectively ensuring the coaxiality accuracy and machining stability of the kingpin hole. Simultaneously, through longitudinal comparison, the lifespan of each drill bit is independently assessed and warned, fully utilizing tool life while avoiding machining quality risks. The entire system, through multi-station automatic switching and intelligent decision-making, significantly reduces manual intervention, improving production efficiency while reducing tool wear and quality costs.

[0025] 2. This invention provides a drilling device for kingpin holes in automotive steering knuckles. By setting a separable transmission connection structure between the mounting plate and the spindle motor, the spindle motor can remain stationary when the turntable switches positions. The transmission connection and separation can be achieved only by a slight movement of the platform. This design significantly reduces the motion inertia and energy consumption during the switching process, improves the tool changing speed and positioning accuracy, and avoids the wear and failure risks caused by repeatedly dragging the motor cable and cooling pipes. This greatly enhances the long-term reliability and maintenance convenience of the equipment.

[0026] 3. This invention provides a drilling device for the kingpin hole of an automotive steering knuckle. By adopting a control scheme that combines electromagnet drive with spring reset, a key elastic buffer mechanism is introduced into the transmission docking process. This design not only enables rapid response to achieve transmission separation, but also allows the transmission key and keyway to automatically slide into engagement by spring pressure when there is slight misalignment during reset. This completely avoids the risks of impact, tooth jamming, or jamming caused by rigid drive, and greatly improves the success rate and reliability of docking.

[0027] 4. This invention provides a drilling device for kingpin holes in automotive steering knuckles. By integrating a coolant channel inside the transmission knuckle and combining it with a through-type design between the rotary joint, the drive shaft, and the drill bit, an internal cooling system that rotates synchronously with the power transmission is constructed. This system can accurately deliver high-pressure coolant to the cutting edge of the drill bit while the drill bit is working, achieving efficient cooling and chip removal, significantly extending the service life of the drill bit and improving the quality of the hole wall processing. Its compact integrated design avoids the entanglement and interference of external cooling pipes, perfectly adapts to the working mode of rotary table station switching, and the multi-layer sealing structure ensures zero leakage reliability of coolant under high-speed rotation and frequent switching conditions.

[0028] 5. This invention provides a drilling device for kingpin holes in automotive steering knuckles. By setting a special nozzle with bidirectional cleaning function, the nozzle adopts a unique dual-chamber structure, which can provide two different cleaning modes according to the through-hole status: when the hole is open, coolant is sprayed forward from the flushing hole near the hole opening to push the chips out of the outlet; when the hole is blind, the flushing hole at the deep end flushes backward to discharge the chips from the inlet. This directional cleaning mechanism effectively solves the technical problem that traditional unidirectional flushing pushes the chips into the hole when the hole is blocked, resulting in more serious accumulation. Attached Figure Description

[0029] The invention will now be further described with reference to the accompanying drawings.

[0030] Figure 1 This is a three-dimensional structural diagram of the entire invention;

[0031] Figure 2 This is a first-view structural schematic diagram of the drilling rig of the present invention;

[0032] Figure 3 This is a structural schematic diagram of the drilling platform of the present invention from a second perspective;

[0033] Figure 4 This is a cross-sectional structural schematic diagram of the drilling platform of the present invention;

[0034] Figure 5 This is a schematic diagram of the installation structure of the transmission joint and transmission key of the present invention;

[0035] Figure 6 This is a perspective view of the hole-clearing structure of the present invention;

[0036] Figure 7 This is a cross-sectional view of the hole-cleaning structure of the present invention;

[0037] Figure 8 This is a schematic diagram of the external structure of the nozzle of the present invention;

[0038] Figure 9 This is a cross-sectional structural diagram of the nozzle of the present invention in two different working states;

[0039] Figure 10 This is one of the structural schematic diagrams of the clamping assembly of the present invention;

[0040] Figure 11 This is the second schematic diagram of the clamping assembly of the present invention.

[0041] In the diagram: 1. Control panel; 2. Drilling platform; 3. Feed assembly; 401. Turntable; 402. Mounting plate; 403. Drive shaft; 404. Mounting head; 405. Drill bit; 406. Spindle motor; 407. Transmission joint; 408. Keyway; 409. Transmission key; 501. Slide rail; 502. Slider; 503. Platform; 504. First fixing block; 505. Electromagnet; 506. Second fixing block; 507. Slide rod; 508. Clamping spring; 509. Iron block; 510. Linkage block; 601. Rotary joint; 602. First cavity; 603. Annular groove; 604. Second cavity; 605. Connecting hole; 606. First through hole; 607. Second through hole; 608. Water inlet; 701. Connector; 702. Nozzle; 703. First flushing hole; 704. Second flushing hole; 705. Baffle plate; 706. Valve hole; 707. First output hole; 708. Second output hole; 709. Wire brush; 710. Valve stem; 711. Distribution plate; 801. Prismatic groove; 802. Cylindrical groove; 803. Spiral groove; 804. Trigger rod; 805. Prismatic block; 806. Return spring; 807. Sliding ball; 808. Pad block; 901. Cylinder; 902. Pressure rod; 903. Support block; 904. Pressure block; 905. Positioning plate; 906. Positioning ring; 907. Positioning pin; 11. Movable platform; 12. Switching motor; 13. Gear; 14. Gear ring; 15. Water outlet. Detailed Implementation

[0042] The present invention will be further described in detail below with reference to the embodiments.

[0043] Example 1

[0044] like Figures 1-11As shown, this invention provides a drilling device for kingpin holes in automotive steering knuckles, including an operating platform 1 and a clamping assembly disposed on the top of the operating platform 1; it also includes: two drill rigs 2, symmetrically distributed on both sides of the operating platform 1; a feed assembly 3, one set on the top of each of the two drill rigs 2, used to control the linear movement of a movable platform 11 fixedly connected to its movable end; a turntable 401, rotatably connected to the top of the movable platform 11 via a slewing bearing, which can be controlled by a switching structure to switch work positions; a plurality of mounting plates 402 are fixedly connected in a circular array at equal intervals on the top of the turntable 401, and a drive shaft 403 is rotatably connected to each mounting plate 402, with a mounting head 404 fixedly connected to one end of each drive shaft 403; and drill bits 405, connected to the inside of the mounting head 404 by screws, with one fewer drill bit 405 on each side of the turntable 401 than the number of mounting heads 404. The mounting plates 402 on which the drill bits 405 are mounted... All components are equipped with indicator lights; a spindle motor 406 drives the drill bit 405 to rotate via a transmission shaft 403; a torque sensor is mounted on the spindle motor 406 to collect torque data of the drill bit 405 in real time; a data comparison component includes: a lateral comparison unit configured to calculate the real-time torque difference between the drill bits 405 on both sides; a longitudinal comparison unit configured to calculate the ratio of the current torque data of each drill bit 405 to the initial torque reference value, as the torque change rate; a decision unit used to generate a tool matching command when the real-time torque difference exceeds a first preset threshold; and to generate a tool replacement command when the ratio exceeds a second preset threshold; and a controller electrically connected to the data comparison component, the switching motor 12, and the indicator lights, which controls the switching motor 12 to rotate the turntable 401 according to the tool matching command, selecting a pair of drill bits 405 with the closest current wear state from the drill bits 405 on both sides for operation.

[0045] The switching structure includes a switching motor 12 fixedly installed on one side of the movable platform 11. A gear 13 is fixedly connected to the output end of the switching motor 12. A gear ring 14 is fixedly connected to the outside of the slewing bearing. The gear ring 14 meshes with the gear 13.

[0046] The closest wear condition refers to the smallest absolute value of the difference in torque change rate between the two drill bits 405; when the controller performs tool matching, it is configured to perform the following steps:

[0047] S1: Pause the processing;

[0048] S2: Obtain the status data of all available drill bits 405; where the status data refers to the torque change rate of the drill bit 405. For drill bits 405 that are not in use, the torque change rate is recorded as 1.0 (i.e., the initial reference state).

[0049] S3: Execution Matching and State Management

[0050] S3.1 (Matching Core): Select a pair of drill bits 405 from the available drill bits 405 on both sides, so that the absolute value of the difference between their torque change rates is minimized, and use them as a new working pair.

[0051] S3.2 (Status Maintenance): After the matching process, check all drill bits 405 independently: if the torque change rate of any drill bit 405 exceeds the second preset threshold, control the corresponding indicator light to illuminate to remind the operator that the drill bit 405 at that station needs to be maintained.

[0052] S4: Control the switching motor 12 to rotate the turntable 401, and rotate the drill bit 405 selected in S3.1 to the working position;

[0053] S5: Resume the processing.

[0054] Preferably, two drill rigs 2 are symmetrically arranged on both sides of the operating table 1, and the distance between them is adjustable according to the size of the steering knuckle; each drill rig 2 is equipped with a set of feed components 3, which adopt the form of servo motor driving ball screw, and the servo motor drives the ball screw to rotate, thereby driving the slider 502 to move precisely.

[0055] The rotary table 401 is mounted on the movable platform 11 via a large slewing bearing. The diameter of the rotary table 401 is preferably 800-1200 mm. The number of mounting plates 402 is preferably 6, distributed at a 60° equiangular angle. Each of the 5 mounting plates 402 on each side is equipped with a drill bit 405, for a total of 5+5 drill bits 405 on both sides. The matching methods of the drill bits on both sides are 5×5. The switching motor 12 is a servo motor, which is connected to the gear 13 via a reducer. The module of the gear 13 is 4-6, and the module of the gear ring 14 matches that of the gear 13.

[0056] Drill bit 405 adopts a U-shaped drill structure with a shank diameter ranging from 20 to 50 mm. Each drill bit 405 is equipped with an independent spindle motor 406 with a power of 5 to 15 kW and a speed range of 500 to 3000 rpm. The indicator lights are tri-color LEDs: green (drill bit 405 is normal and not used), yellow (drill bit 405 has been used but not scrapped), and red (drill bit 405 is scrapped and needs to be replaced).

[0057] The torque sensor is preferably a non-contact type, installed at the output end of the spindle motor 406; the data acquisition frequency is 100–1000 Hz to ensure accurate capture of torque change trends; the initial torque reference value is determined by machining 3–5 test pieces under standard process parameters after installing a new tool, and taking the average torque during the stable machining phase. The system is equipped with a data storage module to record the torque change rate data of the corresponding station. The unused torque data after replacement is recorded as the initial reference value for easy comparison later.

[0058] The first and second preset thresholds are determined experimentally based on tool characteristics, workpiece material, and machining parameters. Generally, the first preset threshold (the lateral torque difference used to trigger tool matching) can be set in the range of 20% to 40%, preferably 30%. The purpose is that when the wear difference between the two tools reaches this level, it begins to have a detectable impact on the coaxiality of the kingpin hole, and timely matching can effectively correct this problem.

[0059] The second preset threshold (the longitudinal torque change rate used to trigger a tool change warning) can be set in the range of 120% to 180%, preferably 150%. The purpose is that when tool wear causes the cutting torque to rise to this level, it indicates that the tool is nearing the end of its life, and continued use will face the risk of a sharp decline in machining quality or tool breakage, so a replacement prompt is required.

[0060] In this embodiment, the symmetrical arrangement of the dual drill rigs 2 and the rotary table 401, combined with real-time monitoring by torque sensors and data comparison components, enables precise perception and intelligent matching of the wear status of the drill bits 405 on both sides. When the system detects that the torque difference between the two sides exceeds the threshold through lateral comparison, it can automatically select the pair with the closest wear status from the candidate drill bits 405 on both sides for switching, effectively ensuring the coaxiality accuracy and machining stability of the kingpin hole. At the same time, through longitudinal comparison, the lifespan of each drill bit 405 is independently evaluated and warned, making full use of tool life while avoiding machining quality risks. The entire system significantly reduces manual intervention through multi-station automatic switching and intelligent decision-making, improving production efficiency while reducing tool wear and quality costs.

[0061] When the equipment is working, the steering knuckle workpiece is precisely positioned and clamped by the clamping assembly on the operating table 1; the feed assembly 3 on the two drilling rigs 2 drives the movable platform 11 and the turntable 401 above it to move toward the workpiece as a whole; the turntable 401 is mounted on the movable platform 11 by a slewing bearing, and the gear 13 is driven by the switching motor 12 to mesh with the gear ring 14 to realize the precise indexing rotation of the turntable 401; the mounting plates 402 of the ring array on the top of the turntable 401 are all connected to the mounting heads 404 by the transmission shaft 403, and except for one station which is empty, the other stations are all equipped with U-shaped drill bits 405 by screws.

[0062] During machining, the spindle motor 406 drives the drill bit 405 to rotate via the transmission shaft 403. A torque sensor fixedly mounted on the output end of the spindle motor 406 continuously collects torque data from the working drill bit 405 and transmits it to the data comparison component. The lateral comparison unit in the data comparison component calculates the torque difference between the two working drill bits 405 in real time, while the longitudinal comparison unit calculates the ratio of the current torque of each drill bit 405 to its initial torque reference value (i.e., the torque change rate). The decision unit continuously monitors these data: when the lateral torque difference exceeds a first preset threshold (e.g., 30%), it indicates that uneven wear of the drill bits 405 on both sides has affected coaxiality, and a tool matching command is immediately generated; when the torque change rate of any drill bit 405 exceeds a second preset threshold (e.g., 150%), it indicates that the lifespan of that drill bit 405 is nearing its end, and a tool replacement command is generated. After receiving the tool matching command, the controller executes the above-configured working steps according to a preset program.

[0063] Throughout the process, the three-color indicator lights mounted on the mounting plate 402 display the status of the drill bits 405 at each station in real time (green indicates normal and unused, yellow indicates used but not scrapped, and red indicates scrapped and awaiting replacement), providing operators with intuitive status indications. The system's data storage module records the torque change rate data at each station and calculates the newly replaced unused drill bits 405 according to the initial benchmark value, providing data support for subsequent comparisons. Through this drilling system, automatic tool matching and maintenance prompts are achieved without stopping the machine, significantly improving machining accuracy and production efficiency.

[0064] Example 2

[0065] like Figure 2 , Figure 3 and Figure 4 As shown, based on Embodiment 1, the present invention provides a technical solution: Preferably, the end of the drive shaft 403 away from the mounting head 404 extends to the other side of the mounting plate 402 and has a drive key 409; a slide rail 501 is fixedly connected to the top of the movable platform 11 and located inside the slewing bearing, a slider 502 is slidably connected to the slide rail 501, a platform 503 is fixedly connected to the top of the slider 502, a control mechanism for controlling the movement of the platform 503 is provided on the top of the movable platform 11, a spindle motor 406 is fixedly installed on the top of the platform 503, a drive joint 407 is fixedly connected to the output end of the spindle motor 406, and a keyway 408 for cooperating with the drive key 409 is provided on the drive joint 407.

[0066] Based on the requirements of the above scheme, it is necessary to continuously switch drill bit 405, and drill bit 405 needs to be connected to spindle motor 406 for transmission. In order to reduce the use of drive devices (such as motors, reducers, etc.) and simplify the equipment, it is necessary to set up a structure that can flexibly separate and combine transmission to meet the needs of workstation switching and transmission at the same time.

[0067] In this embodiment, by setting a separable transmission connection structure between the mounting plate 402 and the spindle motor 406, the spindle motor 406 can remain fixed when the turntable 401 switches positions, and the transmission connection and separation can be achieved by only a slight movement of the platform 503. This design significantly reduces the motion inertia and energy consumption during the switching process, improves the tool changing speed and positioning accuracy, and avoids the wear and failure risks caused by repeatedly dragging the motor cable and cooling pipe, greatly enhancing the long-term reliability and maintenance convenience of the equipment.

[0068] When the controller issues a command to switch workstations, the control mechanism is first activated, driving the platform 503 to move backward along the slide rail 501 (the side of the slide rail 501 away from the drill rig 2 is defined as the rear). The movement of the platform 503 causes the spindle motor 406 fixed on it and the transmission joint 407 at the output end to move backward together, so that the keyway 408 inside the transmission joint 407 is disengaged from the transmission key 409 at the end of the current workstation's transmission shaft 403, and the power connection is safely disconnected. Subsequently, the switching motor 12 starts, precisely driving the turntable 401 to rotate, rotating the transmission shaft 403 of the target workstation to the working position. After the turntable 401 is positioned, the control mechanism drives the platform 503 to move forward along the slide rail 501, so that the transmission section 407 is reset. During this process, the keyway 408 on the inner wall of the transmission section 407 automatically aligns and re-engages with the transmission key 409 at the end of the transmission shaft 403 of the target station, restoring the power connection. Throughout the process, the heavy spindle motor 406 does not need to rotate, but only performs a small range of linear motion through the lightweight platform 503, thus achieving efficient and precise station switching.

[0069] like Figure 2 and Figure 4 As shown, preferably, the control mechanism includes a first fixed block 504 fixedly connected to the top of the movable platform 11, a linkage block 510 fixedly connected to the bottom of the platform 503, a slide rod 507 slidably connected to the first fixed block 504, the slide rod 507 passing through the first fixed block 504, an iron block 509 fixedly connected to one end of the slide rod 507, and a linkage block 510 fixedly connected to the other end, a retaining spring 508 sleeved outside the slide rod 507 and between the linkage block 510 and the first fixed block 504, a second fixed block 506 fixedly connected to the top of the movable platform 11, an electromagnet 505 fixedly connected to the side of the second fixed block 506 near the first fixed block 504, and the electromagnet 505 and the iron block 509 working together.

[0070] The above scheme proposes a functional concept of achieving power engagement and disengagement by driving the displacement of the platform 503 through a control mechanism. However, if a rigid drive method such as a motor screw or cylinder 901 is used, the transmission key 409 and the keyway 408 must achieve micron-level absolute alignment each time they are reset. This is extremely difficult to guarantee under actual processing and assembly errors, and is prone to impact, jamming or wear, leading to equipment failure.

[0071] In this embodiment, a control scheme employing an electromagnet 505 drive combined with a retaining spring 508 for reset introduces a crucial elastic buffer mechanism into the transmission docking process. This design not only enables rapid response to achieve transmission separation but also allows the transmission key 409 and keyway 408 to automatically slide into engagement under spring pressure during reset, even in cases of slight misalignment. This completely avoids the risks of impact, tooth jamming, or jamming caused by rigid drive, significantly improving the success rate and reliability of docking. Furthermore, its automatic spring reset feature after power failure constitutes a fail-safe mode. The core improvement lies in replacing rigid displacement control with elastic compliant control. It utilizes the retaining spring 508 to provide a continuous, flexible docking force, rather than a fixed rigid displacement.

[0072] The specific working principle of the control mechanism is as follows:

[0073] Separation process: When it is necessary to switch work stations, the controller energizes the electromagnet 505, which generates a strong magnetic field that attracts the iron block 509 at one end of the slide bar 507. This causes the slide bar 507 to overcome the preload of the retaining spring 508 and move towards the electromagnet 505. The slide bar 507 drives the platform 503 to slide backward on the slide rail 501 through the linkage block 510, thereby realizing the separation of the transmission section 407 and the transmission key 409.

[0074] Docking process: When the workstation switch is completed, the controller cuts off the power to the electromagnet 505. After the magnetic field disappears, the compressed clamping spring 508 releases its elasticity, pushing the linkage block 510 and the slide rod 507, thereby driving the platform 503 to return to its original position. The advantage of this process is that if the keyway 408 of the transmission section 407 and the transmission key 409 of the transmission shaft 403 are perfectly aligned, they will directly mesh. If there is a slight deviation, the continuous pressure of the clamping spring 508 will force the transmission section 407 to press against the transmission key 409. In this state, the output shaft of the spindle motor 406 is controlled to rotate slowly for several revolutions (e.g., 3 revolutions) to align until the keyway 408 is aligned with the transmission key 409. The keyway 408 and the transmission key 409 automatically complete the insertion, completing the flexible docking. Absolutely precise initial alignment is not required, and damage to the device is avoided.

[0075] Example 3

[0076] like Figure 2 and Figure 4As shown, based on Embodiment 2, the present invention provides a technical solution: Preferably, a rotary joint 601 is rotatably connected to the outside of the transmission joint 407. The rotary joint 601 is fixedly connected to the housing of the spindle motor 406. The rotary joint 601 has a first cavity 602 inside, and an annular groove 603 is formed in the middle of the inner side of the rotary joint 601. A second cavity 604 is provided inside the transmission joint 407. A plurality of connecting holes 605 are formed in an annular array on the side wall of the transmission joint 407. The connecting holes 605 are used to connect the annular groove 603 and the second cavity 604. The transmission joint 407 is close to the keyway 40. A first through hole 606 is provided in the middle of one side of the 8, a second through hole 607 is provided in the middle of the drive shaft 403, and a water outlet hole 15 is provided on the drill bit 405. The water outlet hole 15, the second through hole 607, and the first through hole 606 are all connected to the second cavity 604. A water inlet 608 is provided on the rotary joint 601, which is connected to the first cavity 602 and is connected to an external coolant supply device. Sealing rings are provided at the connection between the rotary joint 601 and the drive section 407, the docking part between the drive shaft 403 and the drive section 407, and the connection part between the drill bit 405 and the mounting head 404.

[0077] In traditional U-drill systems, coolant is typically sprayed from the drill bit 405 to cool the drilling location. However, the power separation structure in the above solution (the spindle motor 406 and the drill bit 405 are not fixedly connected but detachably connected) brings an accompanying problem: how to ensure a continuous supply of cooling. If the spindle motor 406 rotates with the turntable 401, the cooling pipes can be arranged accordingly. However, the optimized design of this solution makes the spindle motor 406 fixed, with only the transmission interface moving. Although this improvement enhances tool changing efficiency and reliability, it makes it extremely difficult to supply coolant to the drill bit 405. That is, the traditional fixed pipes cannot adapt to the rotating turntable 401 and the drill bits 405 at each station.

[0078] In this embodiment, by integrating a coolant channel inside the transmission joint 407 and coordinating the through-connection design between the rotary joint 601 and the transmission shaft 403 and the drill bit 405, an internal cooling system that rotates synchronously with the power transmission is constructed. This system can accurately deliver high-pressure coolant to the cutting edge of the drill bit 405 while the drill bit 405 is working, achieving efficient cooling and chip removal, significantly extending the service life of the drill bit 405 and improving the hole wall machining quality. Its compact integrated design avoids the entanglement and interference of external cooling pipes, perfectly adapts to the working mode of the rotary table 401 position switching, and the multi-layer sealing structure ensures zero leakage reliability of the coolant under high-speed rotation and frequent switching conditions.

[0079] An external coolant supply device delivers high-pressure coolant through pipelines to the inlet 608 of the rotary joint 601. The coolant first enters the first cavity 602 inside the rotary joint 601. Since the rotary joint 601 is fixed to the housing of the spindle motor 406 and does not rotate, the coolant then passes through the annular groove 603 inside the rotary joint 601 and through several connecting holes 605 on the side wall of the transmission joint 407, entering the second cavity 604 inside the transmission joint 407, which rotates with the spindle motor 406. When the transmission joint 407 engages with the transmission key 409 of the transmission shaft 403 through the keyway 408, the coolant flow channel is opened. The coolant flows from the second cavity 604 of the transmission joint 407 through the first through hole 606 at its end into the second through hole 607 in the middle of the transmission shaft 403, finally reaching the outlet hole 15 inside the drill bit 405 and spraying out from the position closest to the cutting edge, directly acting on the cutting area.

[0080] Throughout the entire conveying path, sealing rings are provided at the connection points between the rotary joint 601 and the transmission section 407, the docking points between the transmission section 407 and the transmission shaft 403, and the connection points between the drill bit 405 and the mounting head 404. These sealing rings form multiple sealing barriers, ensuring that the coolant can be completely sealed during the transfer from the stationary rotary joint 601 to the high-speed rotating drill bit 405, even if there is relative movement, thus preventing leakage. This allows each drill bit 405 in position to receive a continuous, stable, and high-pressure supply of coolant, completely unaffected by the switching action of the turntable 401.

[0081] Example 4

[0082] like Figure 2 , Figure 6 and Figure 7As shown, based on Embodiment 3, the present invention provides a technical solution: Preferably, the mounting head 404 without the drill bit 405 is internally connected to a connector 701 by screws. One end of the connector 701 is fixedly connected to a nozzle 702. The nozzle 702 is I-shaped, and a partition 705 is fixedly connected inside the nozzle 702. A valve hole 706 is provided on the partition 705. A distribution plate 711 is rotatably connected inside the partition 705 and the nozzle 702 near the connector 701. The distribution plate 711 fits snugly with both the partition 705 and the inner cavity of the nozzle 702. An input hole is provided in the middle of the distribution plate 711 near the connector 701, and a first output hole 707 and a second output hole 708 are provided on the side away from the connector 701. An output hole 707 and a second output hole 708 are arranged radially; a first flushing hole 703 is provided on the inner side of the nozzle 702 near the end of the connector 701; the distance from the first flushing hole 703 to the axis of the nozzle 702 is equal to the distance from the first output hole 707 to the axis, and the distance from the valve hole 706 to the axis of the nozzle 702 is equal to the distance from the second output hole 708 to the axis; a valve stem 710 is rotatably connected to the inner side of the nozzle 702 away from the connector 701, and one end of the central shaft of the distribution plate 711 extends to the other side of the partition 705 and is fixedly connected to the valve stem 710; a second flushing hole 704 is provided on the inner side of the nozzle 702 away from the connector 701; an adjustment structure for controlling the rotation of the valve stem 710 is provided on the nozzle 702.

[0083] In traditional drilling equipment, when the torque sensor detects an abnormality, it may be due to wire tangling. Even if the drill bit 405 is switched, the abnormal torque may still occur. To address this, this solution adds a hole cleaning structure, which aims to perform a hole cleaning operation first when an abnormal torque occurs, and then switch the drill bit 405 to reduce the generation of errors.

[0084] However, traditional hole cleaning structures can only clean by spraying coolant from the hole opening inward. This method is effective for through holes, but the abnormality may occur when the kingpin hole is not drilled through. In this state, the kingpin hole is still a blind hole. For blind holes or severely blocked holes, the unidirectional inward flow will push the loose chips to the bottom of the hole, causing more serious compaction and accumulation, and cannot fundamentally solve the chip removal problem.

[0085] In this embodiment, a hole-cleaning structure with bidirectional cleaning function is provided. In this hole-cleaning structure, the nozzle 702 adopts a unique dual-chamber structure, which can provide two different cleaning modes according to the penetration state of the master pin hole: when the master pin hole is penetrated, the coolant is sprayed forward from the flushing hole near the hole opening to push the chips out of the outlet; when it is a blind hole, the coolant is flushed backward from the flushing hole on the deep side to discharge the chips from the inlet. This directional cleaning mechanism effectively solves the technical problem that traditional unidirectional flushing pushes the chips into the hole when the hole is blocked, resulting in more serious accumulation.

[0086] Specifically, the nozzle 702 is H-shaped (similar to a barbell), and its interior is divided into two chambers by a partition 705. High-pressure coolant enters the nozzle 702 through the connector 701 and reaches the input hole at the distribution plate 711. When processing the through-hole kingpin, the valve stem 710 is in the initial position, the first output hole 707 of the distribution plate 711 is directly opposite the first flushing hole 703, and the second output hole 708 is offset from the valve hole 706 on the partition 705. The coolant flows through the first output hole 707 to the first flushing hole 703 and is sprayed forward, forming a through flow that pushes the chips out of the hole outlet.

[0087] When dealing with unpenetrated blind holes, the valve stem 710 is rotated by adjusting the structure, which in turn rotates the distribution plate 711 by a specific angle, so that the second output hole 708 is aligned with the valve hole 706. At the same time, the first output hole 707 is offset from the first flushing hole 703. The coolant then flows through the second output hole 708 and the valve hole 706 to the second flushing hole 704 near the bottom of the hole in the middle of the nozzle 702, and is sprayed backward, forming a reverse jet that flushes the chips out of the borehole inlet. During the above-mentioned spray flushing process, the spindle motor 406 works, and after transmission (the same transmission method as the drill bit 405, through the transmission joint 407, transmission key 409 and transmission shaft 403, and driving the mounting head 404 to rotate), the nozzle 702 rotates, thereby achieving all-round flushing.

[0088] Example 5

[0089] like Figure 7 , Figure 8 and Figure 9 As shown, based on Embodiment 4, the present invention provides a technical solution: Preferably, the adjustment structure includes a trigger rod 804 slidably connected to the end of the nozzle 702, one end of the trigger rod 804 being rotatably connected to a pad 808, and a reset groove being provided inside the valve stem 710. The reset groove includes two interconnected parts: a cylindrical groove 802 and a prism groove 801. The side of the trigger rod 804 away from the pad 808 extends through the cylindrical groove 802 into the interior of the prism groove 801 and is rotatably connected to a prism block 805. The shape of the prism block 805 matches that of the prism groove 801, and a reset spring 806 is fixedly connected between the prism block 805 and one side of the inner wall of the prism groove 801. A spiral groove 803 is provided on the inner wall of the cylindrical groove 802, and a sliding ball 807 is fixedly connected to the side wall of the trigger rod 804. The sliding ball 807 is slidably connected to the spiral groove 803.

[0090] Although the above solutions provide two effective cleaning modes, the switching method requires automated or manual control, which not only increases the complexity of operation, but also makes it easy for human misjudgment to lead to poor cleaning results.

[0091] In this embodiment, an automatic identification and switching of cleaning modes is achieved by setting a linkage mechanical trigger mechanism. When the nozzle 702 extends into the blind hole and touches the hole wall, the mechanism can automatically trigger the valve stem 710 to rotate and switch to the reverse flushing mode. In the through hole state, the default forward flushing mode is maintained. This identification mechanism based on physical contact does not require additional sensors and complex control, which not only ensures the reliability of mode switching, but also greatly reduces the system cost and complexity.

[0092] In the through-hole state, the nozzle 702 can extend freely without being radially compressed, the trigger rod 804 remains in its initial position, and the valve rod 710 is at its default angle under the action of the return spring 806. At this time, the distribution plate 711 keeps the input hole connected to the first output hole 707, and executes the forward flushing mode (e.g., Figure 9 (As shown in the image above)

[0093] In the blind hole state, when the nozzle 702 extends into the hole, the pad 808 at its end first touches the inner wall of the hole. The hole wall exerts radial pressure on the pad 808, pushing the trigger rod 804 to slide into the nozzle 702. The movement of the trigger rod 804 is converted into rotational motion through the guiding action of the sliding ball 807 at its end in the spiral groove 803. The trigger rod 804 rotates relative to the prism block 805, and the prism block 805 only moves axially and compresses the return spring 806. The rotation drive distribution plate 711 of the valve stem 710 switches to the second working position, so that the second output hole 708 is connected to the valve hole 706, and automatically switches to the backward recoil mode (e.g. Figure 9 (As shown in the image below).

[0094] like Figure 1 , Figure 10 and Figure 11 As shown, preferably, the clamping assembly includes a positioning plate 905 fixedly connected to the top of the operating table 1. Cylinders 901 are fixedly connected to the top of the operating table 1 and to both sides of the positioning plate 905. A pressure rod 902 is hinged to the piston rod end of the cylinder 901. A support block 903 is hinged to the top of the operating table 1. The top of the support block 903 is hinged to the pressure rod 902. A pressure block 904 is fixedly connected to the end of the pressure rod 902 away from the cylinder 901. A placement groove is provided in the middle of the positioning plate 905. A positioning ring 906 is fixedly connected inside the placement groove. A positioning pin 907 is fixedly connected to the top of the positioning plate 905.

[0095] In this embodiment, by optimizing the specific structure of the clamping assembly, a fast and reliable workpiece positioning and clamping function is provided; the articulated linkage mechanism driven by cylinder 901 can generate a stable and amplified clamping force to ensure that the steering knuckle does not shift or vibrate during processing. At the same time, the combination of positioning ring 906 and positioning pin 907 realizes the precise positioning of the workpiece and effectively ensures the processing accuracy of the main pin hole.

[0096] During clamping, the central shaft of the steering knuckle is placed within the positioning ring 906 of the positioning plate 905, and simultaneously angularly positioned by the positioning pin 907. The cylinder 901 is activated, extending its piston rod and pushing the pressure rod 902 to rotate around its hinge point with the support block 903. Since the middle of the pressure rod 902 is hinged to the top of the support block 903, forming a lever structure, the end of the pressure rod 902 away from the cylinder 901 drives the pressure block 904 downwards, thereby reliably pressing the steering knuckle onto the positioning plate 905. The entire clamping process amplifies the clamping force through the lever principle, ensuring stable clamping.

[0097] like Figure 6 and Figure 7 As shown, preferably, a wire brush 709 is provided in the middle of the nozzle 702, and the wire brush 709, the first flushing hole 703 and the second flushing hole 704 are not on the same axis of the nozzle 702.

[0098] In this embodiment, by setting an offset wire brush 709 in the middle of the nozzle 702 and cooperating with flushing holes in different directions, a composite cleaning method combining mechanical scraping and fluid flushing is formed. The arrangement of the wire brush 709, the first flushing hole 703 and the second flushing hole 704 not on the same axis allows for simultaneous scraping and flushing of different parts of the hole wall during the cleaning process, generating a vortex effect and significantly improving the cleaning effect on adhering chips.

[0099] The present invention has been described in detail above. However, modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, any modifications or improvements that do not depart from the spirit of the present invention are within the scope of protection of the present invention.

Claims

1. A drilling device for kingpin holes in automotive steering knuckles, comprising an operating table (1) and a clamping assembly disposed on the top of the operating table (1); characterized in that, Also includes: Two drilling rigs (2) are provided and symmetrically distributed on both sides of the operating platform (1); Feed assembly (3), one set is provided on the top of each of the two drill rigs (2), for controlling the linear movement of the movable platform (11) fixedly connected to its movable end; A turntable (401) is rotatably connected to the top of the movable platform (11) via a slewing bearing. The turntable (401) can be rotated to switch work positions via a switching structure. Several mounting plates (402) are fixedly connected in a ring array at equal intervals on the top of the turntable (401). A drive shaft (403) is rotatably connected to each mounting plate (402). One end of the drive shaft (403) is fixedly connected to a mounting head (404). The drill bit (405) is connected to the inside of the mounting head (404) by screws; The spindle motor (406) drives the drill bit (405) to rotate via the transmission shaft (403); A torque sensor, mounted on the spindle motor (406), is used to collect torque data of the drill bit (405) in real time during operation; Data comparison components include: The lateral comparison unit is configured to calculate the real-time torque difference between the drill bits (405) on both sides during operation; The longitudinal comparison unit is configured to calculate the ratio of the current torque data of each drill bit (405) to the initial torque reference value as the torque change rate; The decision unit is used to generate a tool matching command when the real-time torque difference exceeds a first preset threshold, and to generate a tool replacement command when the ratio exceeds a second preset threshold. The controller is electrically connected to the data comparison component and the switching motor (12). According to the tool matching command, the switching motor (12) is controlled to rotate the turntable (401) and select a pair of drill bits (405) with the closest current wear state from the drill bits (405) on both sides for operation.

2. The drilling equipment for kingpin holes in automotive steering knuckles according to claim 1, characterized in that: The drive shaft (403) extends from the mounting head (404) to the other side of the mounting plate (402) and has a drive key (409); a slide rail (501) is fixedly connected to the top of the movable platform (11) and to the inner side of the slewing bearing, a slider (502) is slidably connected to the slide rail (501), a platform (503) is fixedly connected to the top of the slider (502), a control mechanism for controlling the movement of the platform (503) is provided on the top of the movable platform (11), the spindle motor (406) is fixedly installed on the top of the platform (503), a drive joint (407) is fixedly connected to the output end of the spindle motor (406), and a keyway (408) is provided on the drive joint (407) for use with the drive key (409).

3. The drilling equipment for kingpin holes in automotive steering knuckles according to claim 2, characterized in that: The control mechanism includes a first fixed block (504) fixedly connected to the top of the movable platform (11), a linkage block (510) fixedly connected to the bottom of the platform (503), a slide rod (507) slidably connected to the first fixed block (504), the slide rod (507) passing through the first fixed block (504), an iron block (509) fixedly connected to one end of the slide rod (507), and a linkage block (510) fixedly connected to the other end. A retaining spring (508) is sleeved on the outside of the slide rod (507) and between the linkage block (510) and the first fixed block (504). A second fixed block (506) is fixedly connected to the top of the movable platform (11), and an electromagnet (505) is fixedly connected to the side of the second fixed block (506) near the first fixed block (504). The electromagnet (505) works in conjunction with the iron block (509).

4. The drilling equipment for kingpin holes in automotive steering knuckles according to claim 3, characterized in that: A rotary joint (601) is rotatably connected to the outside of the transmission joint (407). The rotary joint (601) is fixedly connected to the housing of the main spindle motor (406). The rotary joint (601) has a first cavity (602) inside and an annular groove (603) is formed in the middle of the inner side of the rotary joint (601). The transmission joint (407) has a second cavity (604) inside. Several connecting holes (605) are formed in an annular array on the side wall of the transmission joint (407). The connecting holes (605) are used to connect the annular groove (603) and the second cavity (604). A first through hole is formed in the middle of the side of the transmission joint (407) near the keyway (408). (606) A second through hole (607) is provided in the middle of the drive shaft (403), and a water outlet hole (15) is provided on the drill bit (405). The water outlet hole (15), the second through hole (607), and the first through hole (606) are all connected to the second cavity (604). A water inlet (608) connected to the first cavity (602) is provided on the rotary joint (601), and the water inlet (608) is connected to an external coolant supply device. Sealing rings are provided at the connection parts of the rotary joint (601) and the drive joint (407), the docking parts of the drive shaft (403) and the drive joint (407), and the connection parts of the drill bit (405) and the mounting head (404).

5. The drilling equipment for kingpin holes in automotive steering knuckles according to claim 4, characterized in that: The mounting head (404) without the drill bit (405) is internally connected to a connector (701) by screws. One end of the connector (701) is fixedly connected to a nozzle (702). The nozzle (702) is I-shaped, and a partition (705) is fixedly connected inside the nozzle (702). A valve hole (706) is provided on the partition (705). A distribution plate (711) is rotatably connected inside the partition (705) and the nozzle (702) near the connector (701). The distribution plate (711) fits in close contact with the inner cavity of the partition (705) and the nozzle (702). An input hole is provided in the middle of the distribution plate (711) near the connector (701), and a first output hole (707) and a second output hole (708) are provided on the side away from the connector (701). The first output hole (707) and the second output hole (708) are connected in close contact. The outlet holes (708) are arranged radially; a first flushing hole (703) is provided on the inner side of the nozzle (702) near the connector (701); the distance from the first flushing hole (703) to the axis of the nozzle (702) is equal to the distance from the first output hole (707) to the axis, and the distance from the valve hole (706) to the axis of the nozzle (702) is equal to the distance from the second output hole (708) to the axis; a valve stem (710) is rotatably connected to the inner side of the nozzle (702) away from the connector (701), and one end of the central axis of the distribution plate (711) extends to the other side of the partition plate (705) and is fixedly connected to the valve stem (710); a second flushing hole (704) is provided on the inner side of the nozzle (702) away from the connector (701); an adjustment structure for controlling the rotation of the valve stem (710) is provided on the nozzle (702).

6. The drilling equipment for kingpin holes in automotive steering knuckles according to claim 5, characterized in that: The adjustment structure includes a trigger rod (804) slidably connected to the end of the nozzle (702). One end of the trigger rod (804) is rotatably connected to a pad (808). The valve stem (710) has a reset groove inside. The reset groove includes two interconnected parts: a cylindrical groove (802) and a prism groove (801). The side of the trigger rod (804) away from the pad (808) extends through the cylindrical groove (802) into the prism groove (801). The cylindrical groove (802) is rotatably connected to a prism block (805), the shape of which matches that of the prism groove (801). A return spring (806) is fixedly connected between the prism block (805) and one side of the inner wall of the prism groove (801). A spiral groove (803) is provided on the inner wall of the cylindrical groove (802). A ball bearing (807) is fixedly connected to the side wall of the trigger rod (804), and the ball bearing (807) is slidably connected to the spiral groove (803).

7. The drilling equipment for kingpin holes in automotive steering knuckles according to claim 1, characterized in that: The clamping assembly includes a positioning plate (905) fixedly connected to the top of the operating table (1). Cylinders (901) are fixedly connected to the top of the operating table (1) and to both sides of the positioning plate (905). A pressure rod (902) is hinged to the piston rod end of the cylinder (901). A support block (903) is hinged to the top of the operating table (1). The top of the support block (903) is hinged to the pressure rod (902). A pressure block (904) is fixedly connected to the end of the pressure rod (902) away from the cylinder (901). A placement groove is provided in the middle of the positioning plate (905). A positioning ring (906) is fixedly connected inside the placement groove. A positioning pin (907) is fixedly connected to the top of the positioning plate (905).

8. The drilling equipment for kingpin holes in automotive steering knuckles according to claim 5, characterized in that: A wire brush (709) is provided in the middle of the nozzle (702). The wire brush (709), the first flushing hole (703), and the second flushing hole (704) are not on the same axis of the nozzle (702).

Images