A safety seat rotating chassis and processing equipment

Abstract

The application discloses a safe seat rotating bottom disc and a processing equipment, a stand column is arranged on the two sides of a bed body, a cross beam is fixedly installed on the top of the stand column, a double-shaft processing assembly is slidingly connected to the outer surface of the cross beam, a feeding assembly is slidingly installed on the outer surface of the bed body, a detection module is arranged on the double-shaft processing assembly, and a control unit is signal-connected with the detection module, the double-shaft processing assembly and the feeding assembly, the detection module is used for detecting the tool wear state in real time, the control unit directly dynamically reduces the single cutting depth and offsets the feeding direction according to the wear degree in the tooth root fillet corner area, the actual cutting tracks in the new tool and dull tool states are all limited in the theoretical tooth profile boundary, the tooth root of the refined bottom disc gear is free from hidden damage, and the requirement of a user is met.

Description

Technical Field

[0001] This invention relates to the technical field of rotating chassis manufacturing and processing equipment for child safety seats, and particularly to a rotating chassis for child safety seats and processing equipment. Background Technology

[0002] The rotating chassis of a child safety seat is usually formed using powder metallurgy or precision casting. After the chassis blank is formed, there will be burrs and rough tooth sides on the outer surface of the front gear. To further process it, a gantry milling machine with a milling cutter is usually used to perform secondary finishing on the tooth root fillet area and tooth side of the formed gear.

[0003] However, existing processing methods have problems. First, as the milling cutter continues to process, it gradually becomes dull. Due to the compression effect of the dulled cutting edge at the tooth root fillet, the actual cutting depth of the tool constantly deviates from the set value. The processed chassis gears will frequently exhibit overcutting at the tooth root, with obvious chipping and tearing burrs on the tooth surface edges. Furthermore, to suppress the chipping problem, the speed and feed are usually forced to be reduced in advance on site. However, the friction of the worn side edge on the tooth surface cannot be eliminated by simply reducing parameters. Dense tool marks will remain on the tooth surface after finishing. Finally, the most important problem is that the chassis blank has the inherent flow direction of forging and sintering fibers. When the old cutter cuts the fibers at a large angle, the tooth root fillet area is forcibly squeezed and twisted. Even if overcutting does not occur during processing, residual stress is locked inside the tooth root of the finished gear. After the chassis is installed on the vehicle, after several collisions and impacts, the stress concentration is released, which will induce the propagation of microcracks at the tooth root, leading to abnormal breakage of the rotating mechanism within its service life. This method has limitations. Summary of the Invention

[0004] The purpose of this invention is to provide a rotating chassis for a child safety seat and a processing device to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a rotating chassis for a safety seat and a processing equipment, comprising a bed, a column, a dual-axis processing assembly, a loading assembly, a detection module, and a control unit; The uprights are installed on both sides of the bed, and a crossbeam is fixedly installed on the top of the uprights; The dual-axis machining assembly is slidably connected to the outer surface of the crossbeam. The dual-axis machining assembly divides the bed into left and right machining stations, thereby sequentially performing fine finishing on the front and back of the chassis. The top of the chassis is integrally formed with gears. The loading assembly is slidably mounted on the outer surface of the bed and is used to complete the automatic loading, station transfer and processing positioning of the rotating chassis to be processed; The detection module is installed on the dual-axis machining assembly and is used to detect the wear condition of the milling tools in the dual-axis machining assembly in real time. The control unit is connected to the detection module, the dual-axis machining component and the feeding component respectively. The control unit dynamically generates cutting force weights by combining the tool wear amount and fiber flow direction. It adaptively adjusts the tooth root cutting depth reduction and the tool path direction according to the weights. When the wear is aggravated, it switches to step-by-step intermittent cutting to eliminate residual stress at the tooth root, so that the tooth surface of the chassis gear is free from chipping and micro-cracks after fine repair.

[0006] Preferably, the dual-axis machining assembly includes a guide bar and a mounting bracket; The guide strip is fixedly installed on the outer surface of the crossbeam; The two sets of mounting brackets are slidably connected to the outer surface of the crossbeam. The two sets of mounting brackets are respectively set for dual processing stations. The mounting brackets are slidably connected to the outer surface of the guide strip.

[0007] Preferably, the dual-axis machining assembly further includes a drive motor and a threaded rod; The drive motor is fixedly installed at the end of the crossbeam; The threaded rod is located on one side of the drive motor, the output shaft of the drive motor is fixedly connected to the threaded rod, and the threaded rod is rotatably connected to the crossbeam.

[0008] Preferably, the dual-axis machining assembly further includes a milling part and a push-pull cylinder; The milled part is vertically slidably connected inside the mounting bracket; The push-pull cylinders are located on both sides of the milled part and are fixedly connected to the mounting bracket. The push-pull cylinders are used to drive the milled part to move vertically back and forth.

[0009] Preferably, the feeding assembly includes a guide rail, a work slide, and a servo motor; The guide rail is fixedly installed on the top of the bed; The working slide is slidably connected to the outer surface of the guide rail, and the working slide is provided with an installation guide groove. The servo motor is located on one side of the bed.

[0010] Preferably, the feeding assembly further includes a bidirectional lead screw, a rotary table, and a fixed groove; The bidirectional lead screw is located on one side of the servo motor, and is rotatably connected to the bed. The output shaft of the servo motor is driven by the bidirectional lead screw, and the bidirectional lead screw is threadedly engaged with the work slide. The rotary worktable is detachably mounted on the work slide, and the rotary worktable is divided into a turntable and a mounting base from top to bottom; The fixing slot is located on the top of the turntable.

[0011] Preferably, the feeding assembly further includes a mounting block, a screw, and a push rod; Multiple sets of mounting blocks are slidably connected inside the fixing groove. An extension plate is provided on one side of each mounting block, and a locking bolt is provided inside the extension plate. The end of the locking bolt abuts against the fixing groove. The screw is fixedly installed on the top of the mounting block; The push rod has an elongated hole inside, and the push rod is slidably connected to the inside of the screw rod. The screw rod is threaded with a nut, which abuts against the push rod. The end of the push rod abuts against the chassis.

[0012] Preferably, the control unit distinguishes the current milling position as the gear tooth root fillet area or the gear tooth flank area based on the tool wear data and machining coordinates collected by the detection module. When the tooth root fillet area is identified, the control unit divides the cutting force distribution weight into three levels of response: light load, transition and final stage. In the light load stage, the basic depth of cut is maintained and a single micro-finishing pass is added. In the transition stage, the depth of cut is reduced by a non-linear multiple of the weight and a feed offset in the reverse milling direction is introduced simultaneously. When the wear enters the final stage, the tooth root fillet allowance is divided into multiple micro-cuts that advance axially, and a short retraction interval that increases with the weight is left between two adjacent passes to gradually remove the radial extrusion thrust.

[0013] Preferably, the single-cut depth reduction during the transition phase is adjusted with accelerated convergence according to the weight, rather than being reduced proportionally, thereby using the nonlinear failure characteristics of the blunt tool in the rounded corner area to suppress hidden fiber tearing. During tooth flank machining, the control unit synchronously reduces the feed per tooth and increases the spindle speed. When the weight exceeds the set critical value, it forcibly triggers alternating symmetrical tool movement on both sides to eliminate tooth skew caused by unilateral tool deflection.

[0014] Preferably, the rotating chassis for mounting the seat is precision-finished on both sides simultaneously by a processing device, resulting in a toothed surface free of burrs and chipping defects.

[0015] The technical effects and advantages of this invention are as follows: 1. This application uses a detection module to detect the wear status of the tool in real time. The control unit directly reduces the depth of cut and offsets the feed direction in the tooth root fillet area according to the wear degree. The actual cutting trajectory in both new and dull tool states is limited within the theoretical tooth profile boundary, so that the tooth root of the chassis gear after fine repair is free from hidden damage, thus meeting the user's needs.

[0016] 2. Secondly, after the tool enters the wear period, this application automatically raises the spindle speed and forces a switch to alternating symmetrical tool feed on both sides. The unidirectional drag force of the dull side edge on the tooth surface is offset by bidirectional counter-impact, and the tooth surface can be finished in one clamping, which meets the user's needs.

[0017] 3. Finally, this application identifies the end-of-wear stage as an independent working condition, decomposes the tooth root fillet allowance into axially progressive multi-stage micro-cutting, and utilizes the short-term retraction interval of the tool feed gap to gradually remove radial extrusion thrust and heat accumulation. Combined with the layout of alternating dual-station operation, stress is continuously eliminated, so that even if the final formed rotating chassis undergoes multiple dynamic impacts, the tooth root will not develop microcracks due to internal residual stress. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the dual-axis machining assembly of the present invention; Figure 3 This is a schematic diagram of the feeding component of the present invention; Figure 4 This is a schematic diagram of the rotary table of the present invention; Figure 5 This is a schematic diagram of the push rod of the present invention; Figure 6 This is a flowchart illustrating the overall workflow of the device of the present invention. Figure 7 This is a diagram showing the calculation of the cutting force distribution weights in this invention; Figure 8 This is a diagram of the three-level differentiated compensation control strategy of the present invention.

[0019] In the diagram: 1. Bed; 2. Column; 22. Dual-axis machining assembly; 221. Guide bar; 222. Mounting bracket; 223. Drive motor; 224. Threaded rod; 225. Milled part; 226. Push-pull cylinder; 23. Loading assembly; 231. Guide rail; 232. Work slide; 233. Servo motor; 234. Two-way lead screw; 235. Rotary worktable; 236. Fixed slot; 237. Mounting block; 238. Screw; 239. Push rod. Detailed Implementation

[0020] 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.

[0021] Example 1: The present invention provides as follows Figure 1 The rotating chassis and processing equipment for a car seat shown includes a bed 1, a column 2, a dual-axis processing assembly 22, a loading assembly 23, a detection module and a control unit; The uprights 2 are set on both sides of the bed 1, and a crossbeam is fixedly installed on the top of the uprights 2; The dual-axis machining assembly 22 is slidably connected to the outer surface of the crossbeam. The dual-axis machining assembly 22 divides the bed 1 into left and right dual machining stations, and then performs fine finishing on the front and back of the chassis in sequence. The top of the chassis has an integrally formed gear. The loading component 23 is slidably mounted on the outer surface of the bed 1 to complete the automatic loading, station transfer and processing positioning of the rotating chassis to be processed; The detection module is installed on the dual-axis machining assembly 22 and is used to detect the wear condition of the milling tools in the dual-axis machining assembly 22 in real time. The control unit is connected to the detection module, the dual-axis machining component 22) and the feeding component 23) respectively. The control unit dynamically generates cutting force weights based on the tool wear and fiber flow direction, and adaptively adjusts the tooth root cutting depth reduction and tool path direction according to the weights. When the wear is aggravated, it switches to step-by-step intermittent cutting to eliminate residual stress at the tooth root, so that the tooth surface of the chassis gear is free from chipping and micro-cracks after fine repair.

[0022] In this embodiment, the overall operation process of the device is as follows: First, the powder metallurgy formed rotary chassis blank is manually placed inside the rotary worktable 235 and clamped by the circumferentially distributed push rods 239 to complete the workpiece clamping; then, the servo motor 233 rotates to the lead screw, driving the work slide 232 to automatically transport the chassis to be processed to the left processing station to complete the front gear milling finishing; after the processing of one side station is completed, the loading component 23 slides and transfers the workpiece to the right station to complete the chassis structure finishing. It should be noted that the drill bits, speeds, and feed distances used in the left and right stations are different. After processing of one side is completed, the workpiece is transferred to the right station again. Afterwards, the chassis is flipped over to continue processing. Relying on the dual-station layout, continuous processing of both the front and back sides is achieved, improving the continuity of processing. Throughout the milling process, the dual-axis processing component 22 drives the threaded rod 224 to rotate via the drive motor 223, adjusting the lateral processing position of the milled part 225. The push-pull cylinder 226 precisely controls the vertical feed of the milled part 225, matching the gear outer contour trajectory to complete continuous milling. At the same time, the detection module collects tool wear data online throughout the process and feeds it back to the control unit to correct the cutting parameters in real time, adapting to the changes in cutting state caused by continuous tool wear, until the front and back sides of the workpiece are completely finished, meeting the user's needs.

[0023] It should be noted that, in this embodiment, when the control unit performs fine finishing of the tooth root fillet area, it specifically adopts stress reduction control logic based on the coupling weight of the blank fiber flow direction and tool wear, which solves the hidden problem of residual stress concentration at the tooth root while preventing overcutting. The specific principle and steps are as follows: Fiber wear dual-feature weighting calculation; When the detection module identifies the current machining area as the tooth root fillet area, the control unit first retrieves the pre-stored blank fiber flow direction data of this batch of rotating chassis, and calculates the angle between the current milling direction and the tooth root fiber flow direction. And based on this, the fiber weight coefficient is obtained. ;

[0024] In the formula, The acute angle between the main motion direction of the milling cutter and the streamline of the blank ranges from 0° to 90°. The larger the angle, the stronger the shear resistance of the fiber. At the same time, the control unit reads the tool cutting edge radius collected in real time by the detection module. and with the new blade corner radius Based on this, calculate the wear weighting coefficient. ;

[0025] In the formula, The actual fillet radius of the milling cutter's cutting edge, detected in real time. This refers to the new cutting edge radius specified by the manufacturer for this model of milling cutter, which varies with continuous milling. Gradually increase Indicates the passivation ratio of the cutting tool; Subsequently, the control unit couples the two dimensionless weighting coefficients mentioned above to calculate the cutting force distribution weight. ;

[0026] in, The material correction factor is 0.8 for steel chassis and 0.6 for aluminum alloy chassis. In essence, it is the rate of increase in wear on the cutting edge, therefore It is a dimensionless comprehensive risk factor.

[0027] Graded and progressive tooth root compensation is implemented; when When the value is below 0.3, the cutting edge wear is still in the break-in period, and the increase in radial extrusion pressure is less than 12%, with no concentration inflection point in the residual stress at the tooth root; when When the value is greater than 0.65, the cutting edge becomes dull, causing the cutting effect to change from shearing to furrowing. The detection probability of microcracks at the tooth root is as high as 8% or more. Based on this processing rule, this embodiment sets 0.3 and 0.65 as the threshold values ​​for the wear stage.

[0028] The control unit will weight Substituting the nonlinear mapping transforms the original linear concession into a three-level compensation action: On the one hand, the decrease in single cutting depth is based on The relationship is shrinking rapidly, among which It is not a linear reinforcement term; it is used to match the physical characteristics of stress amplification exponentially under heavy wear, and to avoid hidden tearing caused by a dull tool making a small amount of continuous cutting. On the other hand, the control unit divides the compensation intensity according to the above threshold: The mild wear stage: maintain the original single cut depth, and add only one small reverse milling pass to eliminate the initial fiber springback; The moderate wear stage: reduce the depth of cut per pass and, during the reciprocating stroke, add 0.5 times the original feed rate. The reverse vector bias is 1.5 times, where 0.5 is the reverse milling component extraction coefficient, used to control fiber torsional deformation within the elastic recovery range; End-of-life stage: Continuous milling is eliminated, and the tooth root fillet allowance is divided into three axial progressive cuts, with a clearance inserted between adjacent cuts. :

[0029] In the formula, the constant 120 is the hysteresis release base number based on the spindle inertia calibration of the milling part of this equipment. As a dynamic multiplier, the clearance of the retraction tool increases synchronously with the deterioration of wear, ensuring that the radial thermal load on the cutting edge is removed instantaneously.

[0030] Adaptive optical alignment and following on the tooth flank; For the tooth flank region, the control unit dynamically reconfigures the cutting parameters according to the following two formulas:

[0031]

[0032] In the formula, The nominal spindle speed for the new tool. This represents the nominal feed per tooth of the new tool; the constant 0.15 is the speed compensation sensitivity coefficient. Used to suppress ineffective overspeed during severe wear; 0.8 is the base value of the feed attenuation index. To ensure that the tooth flank texture can still achieve progressive finishing after the tool is dulled, when At that time, the control unit forcibly triggers symmetrical tool movement on both sides to eliminate the slight tooth tilt caused by unilateral tool deflection.

[0033] Existing technologies rely solely on rigid tool replacement or linear wear compensation based on tool life thresholds, which cannot address the hidden residual tensile stress at the tooth root caused by the extrusion of the cutting edge during the later stages of passivation. The innovation of this application lies in revealing the nonlinear coupling effect between fiber flow and wear passivation in the fillet region, transforming linear depth reduction into automatic mode switching and intermittent hysteresis unloading based on weights, thereby achieving residual stress reduction throughout the entire tool life cycle.

[0034] Example 2: The present invention provides as follows Figures 2 to 5 The rotating chassis and processing equipment for a car seat shown includes a bed 1, a column 2, a dual-axis processing assembly 22, a loading assembly 23, a detection module and a control unit; The uprights 2 are set on both sides of the bed 1, and a crossbeam is fixedly installed on the top of the uprights 2; The dual-axis machining assembly 22 is slidably connected to the outer surface of the crossbeam. The dual-axis machining assembly 22 divides the bed 1 into left and right dual machining stations, and then performs fine finishing on the front and back of the chassis in sequence. The top of the chassis has an integrally formed gear. The loading component 23 is slidably mounted on the outer surface of the bed 1 to complete the automatic loading, station transfer and processing positioning of the rotating chassis to be processed; The detection module is installed on the dual-axis machining assembly 22 and is used to detect the wear condition of the milling tools in the dual-axis machining assembly 22 in real time. The control unit is connected to the detection module, the dual-axis machining component 22) and the feeding component 23) respectively. The control unit dynamically generates cutting force weights based on the tool wear and fiber flow direction, and adaptively adjusts the tooth root cutting depth reduction and tool path direction according to the weights. When the wear is aggravated, it switches to step-by-step intermittent cutting to eliminate residual stress at the tooth root, so that the tooth surface of the chassis gear is free from chipping and micro-cracks after fine repair.

[0035] The dual-axis machining assembly 22 includes a guide bar 221 and a mounting bracket 222; Guide strip 221 is fixedly installed on the outer surface of the crossbeam; Two sets of mounting brackets 222 are slidably connected to the outer surface of the crossbeam. The two sets of mounting brackets 222 are respectively set to correspond to the dual processing stations. The mounting brackets 222 are slidably connected to the outer surface of the guide strip 221.

[0036] The dual-axis machining assembly 22 also includes a drive motor 223 and a threaded rod 224; Drive motor 223 is fixedly installed at the end of the crossbeam; The threaded rod 224 is located on one side of the drive motor 223. The output shaft of the drive motor 223 is fixedly connected to the threaded rod 224, and the threaded rod 224 is rotatably connected to the crossbeam.

[0037] The dual-axis machining assembly 22 also includes a milling part 225 and a push-pull cylinder 226; The milled part 225 is vertically slidably connected inside the mounting bracket 222; Push-pull cylinders 226 are located on both sides of the milling workpiece 225. The push-pull cylinders 226 are fixedly connected to the mounting bracket 222. The push-pull cylinders 226 are used to drive the milling workpiece 225 to move vertically back and forth.

[0038] The feeding assembly 23 includes a guide rail 231, a work slide 232, and a servo motor 233; The guide rail 231 is fixedly installed on the top of the bed 1; The work slide 232 is slidably connected to the outer surface of the guide rail 231, and the work slide 232 is provided with an installation guide groove. Servo motor 233 is located on one side of the bed 1.

[0039] The feeding assembly 23 also includes a bidirectional lead screw 234, a rotary worktable 235, and a fixed groove 236; The bidirectional lead screw 234 is located on one side of the servo motor 233. The bidirectional lead screw 234 is rotatably connected to the bed 1. The output shaft of the servo motor 233 is driven by the bidirectional lead screw 234. The bidirectional lead screw 234 is threadedly engaged with the work slide 232. The rotary table 235 is detachably mounted on the work slide 232. The rotary table 235 consists of a turntable and a mounting base from top to bottom. The fixing slot 236 is located on the top of the turntable.

[0040] The feeding assembly 23 also includes a mounting block 237, a screw 238, and a push rod 239; Multiple sets of mounting blocks 237 are slidably connected inside the fixing groove 236. An extension plate is provided on one side of the mounting block 237, and a locking bolt is provided inside the extension plate. The end of the locking bolt abuts against the fixing groove 236. Screw 238 is fixedly installed on the top of mounting block 237; The push rod 239 has an elongated hole inside. The push rod 239 is slidably connected to the inside of the screw 238. A nut is threaded onto the screw 238. The nut abuts against the push rod 239. The end of the push rod 239 abuts against the chassis.

[0041] In this embodiment, the structure is completely identical to that of Embodiment 1. The difference lies in the control unit, which is designed for mass production lines with high capacity cycle requirements and adjusts the weighting. The compensation range was limited by engineering procedures, and a lightweight implementation method using parameter combination compensation was adopted: Amplitude limiting and modal degradation; When the production line has a limit on the processing time for a single piece, technicians can preset the time in the storage module of the control unit. The upper limit of amplitude, such as limiting At this point, even if the visual inspection feedback indicates that the tool wear has exceeded the severe threshold, the control unit will no longer trigger the most stringent state of three axial advances + tool retraction gap as described in Example 1. Instead, it will permanently lock the tooth root compensation within the medium wear strategy range.

[0042] Based on this, the control unit performs the following combined compensation: Instead of nonlinear compression of the single cutting depth, the original tooth root allowance is increased into two reciprocating micro-feeds within a single station. This reduces the radial thrust of the blunt tool by dispersing the cutting amount. At the same time, a micro-climbing offset is superimposed only in the second feed, thereby achieving overcut prevention at the expense of a very small cycle time and reducing the computational load inside the PLC.

[0043] Minimalist tracing of the tooth flank; In this embodiment, only one additional tooth-side finishing feed is added under the limiting framework, and the exponential function of spindle speed and feed is no longer dynamically recalculated, making the signal transmission link of the control unit shorter and the response more stable; Furthermore, the above limiting logic is also compatible with the dynamic switching of the raw material: If the current batch is replaced with an aluminum alloy chassis, the material coefficient... The value was reduced from 0.8 to 0.6 under the same wear conditions. The natural fallback, the control unit automatically releases the amplitude limiting constraint and allows a brief call to the discontinuous mode of Example 1, which reflects the free tailoring of two implementation paths under the same control logic: lightweight and high precision.

[0044] In actual operation, the operator selects the cycle priority mode on the touch screen to activate this embodiment: after the loading component 23 transfers the chassis to the right station, the system uses the γ reference value inherited from the left station to complete the differential compensation between the tooth root and tooth side without being noticed within the limit boundary. The rotating chassis processed by this mode can still stably meet the factory standard of no obvious chipping on the tooth surface and no obvious cracks in the tooth root within the range of moderate tool wear.

[0045] Each mounting bracket 222 has a milling component 225 vertically mounted inside. The bottom of the milling component 225 is equipped with a special milling cutter. A pair of push-pull cylinders 226 are set on both sides of the milling component 225. The cylinders extend and retract to drive the milling component 225 to feed and retract vertically, completing the gear milling cutting action. The detection module is directly fixed to the outside of the housing of the milling component 225, and collects the milling cutter edge wear image and wear size at close range in real time to ensure the accuracy of wear detection data. The work slide 232 is disassembled and installed on the rotary worktable 235. After adjustment, it is locked and positioned by the locking bolts on the extension plate. The mounting block 237 is slidably sleeved on the fixing screw 238 through the elongated hole. The upper and lower, front and back fine adjustment rod 239 is finally locked by the nut. The rod 239 clamps the rotating chassis, realizing universal centering clamping of chassis with different outer diameter specifications. At the same time, the rotary worktable 235 can drive the chassis to rotate circumferentially, and cooperate with the milling part 225 to complete the continuous machining of the full circumference gear.

[0046] Example 3: The present invention provides as follows Figures 6 to 8 The rotating chassis and processing equipment for a car seat shown includes a bed 1, a column 2, a dual-axis processing assembly 22, a loading assembly 23, a detection module and a control unit; The uprights 2 are set on both sides of the bed 1, and a crossbeam is fixedly installed on the top of the uprights 2; The dual-axis machining assembly 22 is slidably connected to the outer surface of the crossbeam. The dual-axis machining assembly 22 divides the bed 1 into left and right dual machining stations, and then performs fine finishing on the front and back of the chassis in sequence. The top of the chassis has an integrally formed gear. The loading component 23 is slidably mounted on the outer surface of the bed 1 to complete the automatic loading, station transfer and processing positioning of the rotating chassis to be processed; The detection module is installed on the dual-axis machining assembly 22 and is used to detect the wear condition of the milling tools in the dual-axis machining assembly 22 in real time. The control unit is connected to the detection module, the dual-axis machining component 22) and the feeding component 23) respectively. The control unit dynamically generates cutting force weights based on the tool wear and fiber flow direction, and adaptively adjusts the tooth root cutting depth reduction and tool path direction according to the weights. When the wear is aggravated, it switches to step-by-step intermittent cutting to eliminate residual stress at the tooth root, so that the tooth surface of the chassis gear is free from chipping and micro-cracks after fine repair.

[0047] Based on the tool wear data and machining coordinates collected by the detection module, the control unit distinguishes whether the current milling position is the gear tooth root fillet area or the gear tooth flank area. When the tooth root fillet area is identified, the control unit divides the cutting force distribution weight into three levels of response: light load, transition and final stage. In the light load stage, the basic depth of cut is maintained and a single micro-finishing pass is added. In the transition stage, the depth of cut is reduced by a non-linear multiple of the weight and a feed offset in the reverse milling direction is introduced simultaneously. When the wear enters the final stage, the tooth root fillet allowance is divided into multiple micro-cuts that advance axially, and a short retraction interval that increases with the weight is left between two adjacent passes to gradually remove the radial extrusion thrust.

[0048] The single depth of cut reduction during the transition phase is accelerated and converged with the weight, rather than being reduced proportionally. The nonlinear failure characteristics of the blunt tool in the rounded corner area are used to suppress hidden fiber tearing. During tooth flank machining, the control unit synchronously reduces the feed per tooth and increases the spindle speed. When the weight exceeds the set critical value, it forcibly triggers alternating symmetrical tool movement on both sides to eliminate tooth skew caused by unilateral tool deflection.

[0049] In this embodiment, the specific hardware composition of the two sets of core electronic control components is first clarified: the detection module is specifically a machine vision tool wear detection sensor integrated on the outside of the milling part 225, with a built-in high-definition industrial camera and ring light source, which can acquire high-definition images of the milling cutter cutting edge in real time. At the same time, it is equipped with a laser ranging submodule to accurately detect quantitative wear parameters such as the wear width and bluntness of the milling cutter cutting edge, realizing non-contact, real-time online wear detection. The control unit is specifically an industrial PLC programmable logic controller, which is equipped with a storage module, a computing module and a signal transceiver module. It has a pre-stored wear feature correlation model. The detection sensor captures images of the milling cutter cutting edge at a fixed frequency, and the laser ranging submodule outputs the wear width of the cutting edge in real time. .

[0050] The control unit has a pre-stored geometric conversion model for wear width and cutting edge fillet radius: The wear width collected by the detection module After conversion, directly substitute into ,accomplish The weights are updated accordingly, and the industrial PLC updates them based on the updated weights. The value is compared in real time with the previous segmented thresholds of 0.3 and 0.65, and the corresponding depth reduction command or time-division intermittent command is dynamically issued. At the same time, the spindle load current fluctuation value of the milling part 225 is read. As The closed-loop check factor; when abnormal leap Before reaching the next mode boundary, the control unit forces an early transition with a first-order compensation force, forming a dual-loop interlock of visual feedforward weighting and current feedback correction.

[0051] Therefore, visual inspection is no longer just used for lifespan alarms, but also for measuring wear width. The continuous translation is for stress reduction decisions, meeting user needs.

[0052] Finally, it should be noted that the above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A machining equipment for rotating chassis of child safety seats, characterized in that, include: Bed frame (1); The uprights (2) are set on both sides of the bed (1), and a crossbeam is fixedly installed on the top of the uprights (2); The dual-axis machining assembly (22) is slidably connected to the outer surface of the crossbeam. The dual-axis machining assembly (22) divides the bed (1) into left and right dual machining stations, and then performs fine finishing on the front and back of the chassis in sequence. The top of the chassis is integrally formed with gears. The loading assembly (23) is slidably mounted on the outer surface of the bed (1) and is used to complete the automatic loading, station transfer and processing positioning of the rotating chassis to be processed; The detection module is installed on the dual-axis machining assembly (22) and is used to detect the wear status of the milling tool in the dual-axis machining assembly (22) in real time. The control unit is connected to the detection module, the dual-axis machining component (22) and the feeding component (23) respectively. The control unit dynamically generates cutting force weights based on the tool wear amount and fiber flow direction, and adaptively adjusts the tooth root cutting depth reduction and tool direction according to the weights. When the wear is aggravated, it switches to step-by-step intermittent cutting to eliminate residual stress at the tooth root, so that the tooth surface of the chassis gear after fine repair is free from chipping and micro-cracks.

2. The child safety seat rotating chassis processing equipment according to claim 1, characterized in that, The dual-axis machining assembly (22) includes a guide bar (221) and a mounting bracket (222): Guide bar (221), which is fixedly installed on the outer surface of the crossbeam; Two sets of mounting brackets (222) are slidably connected to the outer surface of the crossbeam. The two sets of mounting brackets (222) are respectively set for dual processing stations. The mounting brackets (222) are slidably connected to the outer surface of the guide strip (221).

3. The child safety seat rotating chassis processing equipment according to claim 2, characterized in that, The dual-axis machining assembly (22) also includes a drive motor (223) and a threaded rod (224): The drive motor (223) is fixedly installed at the end of the crossbeam; A threaded rod (224) is disposed on one side of a drive motor (223). The output shaft of the drive motor (223) is fixedly connected to the threaded rod (224), and the threaded rod (224) is rotatably connected to a crossbeam.

4. The child safety seat rotating chassis processing equipment according to claim 2, characterized in that, The dual-axis machining assembly (22) also includes a milling part (225) and a push-pull cylinder (226): The milled part (225) is vertically slidably connected inside the mounting bracket (222); A push-pull cylinder (226) is provided on both sides of the milling part (225). The push-pull cylinder (226) is fixedly connected to the mounting bracket (222). The push-pull cylinder (226) is used to drive the milling part (225) to move vertically back and forth.

5. The child safety seat rotating chassis processing equipment according to claim 1, characterized in that, The feeding assembly (23) includes a guide rail (231), a work slide (232), and a servo motor (233): Guide rail (231), which is fixedly installed on the top of the bed (1); A working slide (232) is slidably connected to the outer surface of the guide rail (231), and an installation guide groove is provided on the working slide (232); A servo motor (233) is located on one side of the bed (1).

6. The child safety seat rotating chassis processing equipment according to claim 5, characterized in that, The feeding assembly (23) also includes a bidirectional lead screw (234), a rotary table (235), and a fixed groove (236): A bidirectional lead screw (234) is located on one side of a servo motor (233). The bidirectional lead screw (234) is rotatably connected to the bed (1). The output shaft of the servo motor (233) is driven to connect with the bidirectional lead screw (234). The bidirectional lead screw (234) is threadedly engaged with the work slide (232). A rotary table (235) is detachably mounted on a work slide (232), the rotary table (235) being divided into a turntable and a mounting base from top to bottom; A fixed groove (236) is provided on the top of the turntable.

7. The child safety seat rotating chassis processing equipment according to claim 5, characterized in that, The feeding assembly (23) also includes a mounting block (237), a screw (238), and a push rod (239): Multiple sets of mounting blocks (237) are slidably connected inside the fixing groove (236). An extension plate is provided on one side of the mounting block (237), and a locking bolt is provided inside the extension plate. The end of the locking bolt abuts against the fixing groove (236). The screw (238) is fixedly mounted on the top of the mounting block (237); The top rod (239) has an elongated hole inside. The top rod (239) is slidably connected to the inside of the screw (238). A nut is threaded on the screw (238). The nut abuts against the top rod (239). The end of the top rod (239) abuts against the chassis.

8. The child safety seat rotating chassis processing equipment according to claim 1, characterized in that, The control unit distinguishes between the current milling position as the gear tooth root fillet area or the gear tooth flank area based on the tool wear data and machining coordinates collected by the detection module. When the tooth root fillet area is identified, the control unit divides the cutting force distribution weight into three levels of response: light load, transition and final stage. In the light load stage, the basic depth of cut is maintained and a single micro-finishing pass is added. In the transition stage, the depth of cut is reduced by a non-linear multiple of the weight and a feed offset in the reverse milling direction is introduced simultaneously. When the wear enters the final stage, the tooth root fillet allowance is divided into multiple micro-cuts that advance axially, and a short retraction interval that increases with the weight is left between two adjacent passes to gradually remove the radial extrusion thrust.

9. A child safety seat rotating chassis processing equipment according to claim 8, characterized in that, The single depth of cut reduction during the transition phase is adjusted with accelerated convergence according to the weight, rather than being reduced proportionally. This utilizes the nonlinear failure characteristics of the blunt tool in the rounded corner area to suppress hidden fiber tearing. During tooth flank machining, the control unit synchronously reduces the feed per tooth and increases the spindle speed. When the weight exceeds the set critical value, it forcibly triggers alternating symmetrical tool movement on both sides to eliminate tooth skew caused by unilateral tool deflection.

10. A rotating chassis for mounting a car seat, processed by the car seat rotating chassis processing equipment according to any one of claims 1-9, characterized in that, The rotating chassis for mounting the seat is precision-finished on both sides by a processing machine, resulting in a toothed surface free of burrs and chipping defects.

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