A rotary precision milling cutter head for removing burrs from an injection molded part of an automobile steering wheel

Abstract

The application discloses a rotating precision milling cutter head for removing burrs of an automobile steering wheel injection molding part, and relates to the field of milling cutters.The rotating precision milling cutter head comprises a fixed plate, two fixed plates are arranged in parallel, two rotating shafts are arranged in rotation between the two fixed plates, two gears are arranged on the two rotating shafts, transmission chains are transmission-connected between the gears on the same side of the two rotating shafts, one end of one of the rotating shafts extends out of the fixed plate and is connected with a first motor.The application realizes flexible clamping of a circular ring-shaped injection molding part, avoids clamping deformation, and is suitable for injection molding parts of steering wheels with different diameters and specifications;the soft contact material is adopted to protect the surface of the workpiece while efficiently removing the burrs, and dust is not easily generated;the burrs are removed by using the precision milling silica gel column, and the injection molding part is less damaged.

Description

Technical Field

[0001] This invention relates to the field of milling cutter technology, and more specifically to a rotary precision milling cutter head for deburring injection molded automotive steering wheel parts. Background Technology

[0002] As a core component of the automotive safety system, the quality of the injection-molded steering wheel directly affects driving safety and comfort. Steering wheel injection molded parts are typically manufactured using high-strength engineering plastics (such as ABS, PC / ABS alloy, or glass fiber reinforced nylon) through injection molding. Due to factors such as the parting surface of the injection mold, the gate location, and the draft angle, defects such as burrs and flash are inevitably produced after molding. Current technology typically involves manual burr removal, which is inefficient; furthermore, using sandpaper generates dust pollution, and manual burr removal is highly dependent on the operator's skill level.

[0003] Therefore, we provide a rotary milling cutter head for deburring injection molded automotive steering wheels to solve the above problems.

[0004] To address the problems existing in the prior art, the present invention provides a rotary milling cutter head for deburring automotive steering wheel injection molded parts, which enables flexible clamping of annular injection molded parts, avoids clamping deformation, and is adaptable to steering wheel injection molded parts of different diameters.

[0005] To achieve the above objectives, the present invention employs a rotary precision milling cutter head for deburring injection molded automotive steering wheel parts, comprising a fixed plate, wherein two fixed plates are arranged in parallel, and two rotating shafts are rotatably arranged between the two fixed plates. Two gears are fitted on each of the two rotating shafts, and a conveyor chain is drivingly connected between the gears on the same side of the two rotating shafts. One end of one rotating shaft extends out of the fixed plate and is connected to a first motor. Multiple fixing devices are provided on the two conveyor chains, each fixing device including a first connecting plate and a second connecting plate fixed to the outer surface of the two conveyor chains. A gap is provided between the first connecting plate and the second connecting plate, and a first fixing seat and a second fixing seat are respectively fixed to the top of the first connecting plate and the second connecting plate. The top of both the first fixing seat and the second fixing seat has a first semi-circular groove. The bottom of each of the first semicircular grooves has a through hole; a center plate is set below the first connecting plate and the second connecting plate, and a protective box is fixed to the top of the center plate. The protective box contains a first air pump, and two connecting pipes are connected to the first air pump. The top of each of the two connecting pipes is connected to an elastic suction cup, and the two elastic suction cups are respectively attached to the through holes at corresponding positions; a bracket is fixed to the outside of each of the two fixed plates, and a vertical plate is fixed to the bracket. A top plate is fixed to the top of the two vertical plates, and a cylinder is fixed to the top of the top plate. The telescopic end of the cylinder extends out of the top plate and is connected to a fixed plate. A drive motor is fixed to the bottom of the fixed plate, and a tool connecting shaft is set to the bottom of the drive motor. A semicircular end mill is detachably connected to the bottom of the tool connecting shaft. Multiple precision milling silicone pillars are fixed to the outer ring of the semicircular end mill. The semicircular end mill matches the circular groove formed by the two first semicircular grooves.

[0006] As a further optimization of the above solution, a square plate is fixed to the bottom end of both the first connecting plate and the second connecting plate, and a reset spring is connected between the two square plates.

[0007] As a further optimization of the above solution, the first fixing seat has a protruding end on the side near the second fixing seat, and the second fixing seat has a slot on the side near the first fixing seat. The protruding end is engaged inside the slot and is elastic.

[0008] As a further optimization of the above scheme, a second air pump and a water pump are fixed on the opposite sides of the two upright plates, respectively. A first bend and a second bend are connected to the opposite sides of the second air pump and the water pump, respectively. One end of the first bend and the second bend extend into the top of the two first semicircular grooves.

[0009] As a further optimization of the above solution, the semi-circular end mill is designed with the round head facing downwards, and the number of silicone pillars precision milled is 12-16, which are evenly distributed along the outer ring of the semi-circular end mill.

[0010] As a further optimization of the above solution, the first and second fixing seats are made of nylon PA66 + 30% glass fiber, and the radius of the first semi-circular groove is 0.5-1.0 mm larger than the outer diameter of the workpiece.

[0011] As a further optimization of the above solution, the elastic suction cup is made of nitrile rubber or silicone rubber and has a diameter of φ30-φ40mm.

[0012] As a further optimization of the above solution, the conveyor chain adopts a double-pitch precision roller chain with a linear speed controlled at 0.5-1.0 m / min.

[0013] As a further optimization of the above scheme, the precision-milled silicone pillar has a Shore hardness of A30-A50, a diameter of φ6-φ8mm, a height of 8-10mm, and a hemispherical top.

[0014] As a further optimization of the above scheme, the second air pump has an air volume ≥100L / min and an air pressure ≥0.05MPa; the water pump has a flow rate ≥5L / min and a head ≥10m.

[0015] The rotary milling cutter head for deburring injection molded automotive steering wheels of the present invention has the following beneficial effects:

[0016] The present invention provides a rotary milling cutter head for deburring automotive steering wheel injection molded parts, which enables flexible clamping of annular injection molded parts, avoids clamping deformation, and is adaptable to steering wheel injection molded parts of different diameters.

[0017] Using soft contact materials, it can effectively remove burrs while protecting the workpiece surface and is less likely to generate dust;

[0018] The process is automated, highly efficient, and with minimal error. It utilizes precision-milled silicone pillars to flexibly remove burrs, minimizing damage to the injection molded parts.

[0019] Specific embodiments of the present invention are disclosed in detail with reference to the following description and accompanying drawings, indicating how the principles of the present invention can be adopted. It should be understood that the embodiments of the present invention are not limited in scope as a result, and that the embodiments of the present invention include many changes, modifications and equivalents within the spirit and scope of the appended claims. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the rotary milling cutter head for deburring injection molded automotive steering wheel parts according to the present invention;

[0021] Figure 2 This is a schematic diagram of the first fixing base structure of the present invention;

[0022] Figure 3 This is a schematic diagram of the protective box structure of the present invention;

[0023] Figure 4 For the present invention Figure 1 Enlarged schematic diagram of the structure at point A in the middle;

[0024] Figure 5 This is a schematic diagram of the semi-circular end mill structure of the present invention.

[0025] In the diagram: 1. Fixed plate; 2. Rotating shaft; 3. Gear; 4. Conveyor chain; 5. First connecting plate; 6. First fixed seat; 7. First semi-circular groove; 8. Bracket; 9. Vertical plate; 10. Top plate; 11. Cylinder; 12. Fixed plate; 13. Drive motor; 14. Tool connecting shaft; 15. Semi-circular end mill; 16. Precision milling silicone column; 17. Square plate; 18. Return spring; 19. Second connecting plate; 20. Center plate; 21. Protective box; 22. Connecting pipe; 23. Elastic suction cup; 24. Second fixed seat; 25. Through hole; 26. Slot; 27. Protruding end; 28. First bend; 29. ​​Second bend; 30. Second air pump; 31. Water pump. Detailed Implementation

[0026] like Figures 1-5 As shown, the rotary milling cutter head for deburring injection molded automotive steering wheels provided by this invention mainly includes the following functional modules:

[0027] The frame support module includes a fixed plate 1, a rotating shaft 2, a gear 3, and a conveyor chain 4, which constitute the basic support and transmission system of the equipment.

[0028] Workpiece fixing module: including first connecting plate 5, first fixing seat 6, first semi-circular groove 7, bracket 8, upright plate 9, top plate 10, etc., to realize the positioning and clamping of workpiece.

[0029] The precision milling module includes a cylinder 11, a fixed plate 12, a drive motor 13, a tool connecting shaft 14, a semi-circular milling cutter 15, and a precision milling silicone pillar 16 to complete the burr removal operation.

[0030] Flexible connection module: including square plate 17, reset spring 18, second connecting plate 19, center plate 20, protective box 21, connecting tube 22 and elastic suction cup 23, to realize flexible connection and vacuum adsorption of the fixing device.

[0031] Cleaning and drying module: including second fixed seat 24, through hole 25, slot 26, protruding end 27, first bend 28, second bend 29, second air pump 30 and water pump 31, to complete the cleaning and drying after processing.

[0032] The modules work together to form a continuous automated processing flow of "feeding - adsorption and fixation - precision milling and deburring - cleaning and drying - unloading".

[0033] Two fixing plates 1 are provided, which are made of Q235 steel plates by CNC cutting and milling, with a thickness of 15-20mm. The two plates are distributed in parallel, and the spacing is determined according to the pitch of the conveyor chain 4 (usually 50-80mm). A leveling base is welded to the bottom of the fixing plate 1, and the base has an elongated hole to facilitate level adjustment during equipment installation.

[0034] There are two rotating shafts 2, located on both sides of the fixed plate 1. The rotating shafts 2 are made of 45# steel with heat treatment, hardness HRC28-32, and shaft diameter φ30-φ40mm. The rotating shafts 2 are mounted on the fixed plate 1 through seated bearings (model UCF206 or UCF207). The bearing seats are bolted to the fixed plate 1 for easy maintenance and replacement.

[0035] Installation Notes:

[0036] The parallelism error between the two rotating shafts 2 should be ≤0.05mm / m, otherwise it will cause the conveyor chain 4 to run off-center;

[0037] The fit between the rotating shaft 2 and the bearing housing is an intermediate fit, which ensures positioning accuracy and facilitates disassembly and assembly.

[0038] The bearing housing should be lubricated with grease (lithium-based grease ZL-2) regularly, and it is recommended to perform maintenance every 500 hours of operation.

[0039] Each rotating shaft 2 has two gears 3 fitted on its outer ring. The gears 3 are made of 40Cr steel and the teeth are high-frequency quenched after tempering. The hardness is HRC45-50, the module m=2-3mm, and the number of teeth z=20-25. The gears 3 are connected to the rotating shaft 2 by a flat key and are equipped with a shaft end retaining ring for axial fixation.

[0040] The conveyor chain 4 adopts a double-pitch precision roller chain (model C2080 or C2082), and the tensile strength of the chain plate after heat treatment is ≥31.1kN; the conveyor chain 4 meshes with the inner ring of the gear 3 to form a chain drive mechanism.

[0041] Transmission parameter design:

[0042] The first motor (not shown in the figure) is a Y-series three-phase asynchronous motor with a power of 1.5-2.2kW and a speed of 1390r / min;

[0043] The rotating shaft 2 is driven by a reducer (reduction ratio i=20-30) to control the linear speed of the conveyor chain 4 at 0.5-1.0m / min;

[0044] The speed range has been optimized: too low a speed will affect efficiency, while too high a speed will cause the workpiece to vibrate during finish milling.

[0045] Chain tensioning and adjustment: The conveyor chain 4 will elongate after running for a period of time, and its tension needs to be adjusted regularly. This invention achieves chain tensioning by opening a waist-shaped hole on one of the fixed plates 1, allowing the bearing seat on that side to move laterally; the standard for judging the tension is: when a pressure of 10N is applied to the middle of the chain, the deflection should be 2%-3% of the chain center distance.

[0046] Multiple fixing devices are evenly arranged along the pitch of the conveyor chain 4, with the spacing determined according to the workpiece diameter (usually 400-500 mm); each fixing device includes:

[0047] First connecting plate 5 and second connecting plate 19:

[0048] Material: 6061-T6 aluminum alloy, reducing weight while ensuring strength;

[0049] Thickness: 8-10mm, fixed to the outer chain plate of conveyor chain 4 by countersunk screws;

[0050] A 10-15mm gap is provided between the two plates to allow for deformation space for subsequent flexible connection.

[0051] First fixing seat 6 and second fixing seat 24:

[0052] Material: Nylon PA66 + 30% glass fiber, which combines wear resistance and self-lubrication;

[0053] Structure: The whole structure is semi-cylindrical, with a first semi-circular groove 7 at the top;

[0054] The radius R of the first semicircular groove 7 is determined according to the outer diameter of the workpiece, and is usually 0.5-1.0 mm larger than the outer diameter of the workpiece to form a clearance fit.

[0055] Key design considerations for the first semicircular groove 7:

[0056] Groove width: 1-2mm larger than the workpiece wall thickness to facilitate workpiece placement;

[0057] Groove depth: 1 / 3 to 1 / 2 of the workpiece diameter to ensure stable support;

[0058] The roughness of the groove wall Ra ≤ 1.6 μm to avoid scratching the workpiece surface;

[0059] The bottom of the tank has through holes 25, with a diameter of φ8-φ10mm, for vacuum adsorption and debris discharge.

[0060] The first fixed seat 6 and the second fixed seat 24 are detachably connected to accommodate the turning requirements of the conveyor chain 4.

[0061] The protruding end 27 mates with the slot 26:

[0062] The protruding end 27 is located on the side of the first fixing seat 6 near the second fixing seat 24 and is made of an elastic material (such as polyurethane TPU).

[0063] The slot 26 is located at the corresponding position of the second fixing seat 24, and the slot width is 0.3-0.5mm larger than the protruding end 27;

[0064] In its natural state, the protruding end 27 engages with the slot 26, making the two fixed seats form a complete circular support surface.

[0065] The function of the return spring 18:

[0066] Square plate 17 is welded to the bottom of the first connecting plate 5 and the second connecting plate 19. It is made of Q235 steel and has a thickness of 5mm.

[0067] The return spring 18 is a cylindrical helical compression spring made of 65Mn steel with a wire diameter of φ2-φ3mm.

[0068] The spring pre-compression is designed to be 5-8mm, providing sufficient tension to allow the two fixed seats to reset and engage.

[0069] The motion process during turning: When the fixed device moves with the conveyor chain 4 to the turning section (usually a 90° or 180° arc section):

[0070] 1. The turning of the conveyor chain 4 forces the first connecting plate 5 and the second connecting plate 19 to deflect around their respective connection points.

[0071] 2. The two fixed seats separate, and the protruding end 27 disengages from the slot 26.

[0072] 3. The return spring 18 is stretched, storing elastic potential energy.

[0073] 4. After the turn, the two fixed seats re-engage under the tension of the return spring 18.

[0074] 5. The elastic deformation capability of the protruding end 27 ensures a smooth engagement process without rigid impact.

[0075] Design considerations:

[0076] The radius of the arc of the turning section should be ≥300mm. If it is too small, the return spring 18 will be overstretched and fail.

[0077] The elastic modulus of the protruding end 27 should be controlled between 30-50 MPa. If it is too hard, it will be difficult to engage; if it is too soft, the connection stiffness will be insufficient.

[0078] Regularly check the fatigue condition of the return spring 18; it is recommended to replace it every 100,000 cycles.

[0079] The selection and installation of cylinder 11:

[0080] It adopts a standard double-acting cylinder (such as the SC series), with a cylinder diameter of φ50-φ63mm and a stroke of 100-150mm;

[0081] The working pressure is 0.4-0.6MPa, and the feed speed and pressure are controlled by a pressure reducing valve and a throttle valve;

[0082] The cylinder 11 is fixed to the top center of the top plate 10 via a flange. The top plate 10 is made of Q235 steel plate with a thickness of 12-15mm.

[0083] Guidance and stability design:

[0084] To prevent the fixed plate 12 from rotating during the lifting process, a guide rod (not shown in the figure) is provided on the top of the fixed plate 12.

[0085] The guide rod passes through the linear bearing on the top plate 10 to ensure that the coaxiality error between the semi-circular end mill 15 and the workpiece is ≤0.1mm.

[0086] Selection of drive motor 13:

[0087] It uses an AC servo motor or a variable frequency speed control motor with a power of 0.75-1.5kW;

[0088] The rotation speed adjustment range is 500-3000 r / min, which can be optimized according to the material and thickness of the burr.

[0089] The motor is fixed to the bottom of the fixed plate 12 with screws, and the motor shaft is connected to the tool connecting shaft 14 by a coupling.

[0090] The structure of the semi-circular end mill 15 is as follows:

[0091] Material: 6061-T6 aluminum alloy or POM engineering plastic, with low density and good dynamic balance;

[0092] Shape: The overall shape is semi-circular, with a diameter 2-4mm smaller than the inner diameter of the workpiece to ensure smooth insertion;

[0093] The rounded tip is designed to face downwards to prevent the tool tip from scratching the inner surface of the workpiece.

[0094] Arrangement and parameters of precision-milled silicone pillar 16:

[0095] Quantity: 12-16 pieces are evenly distributed along the outer circumference of the semi-circular end mill;

[0096] Material: Silicone rubber with a Shore hardness of A30-A50, combining elasticity and abrasion resistance;

[0097] Dimensions: Diameter φ6-φ8mm, height 8-10mm, top is hemispherical.

[0098] Fixing method: It is detachably connected to the half-circular end mill 15 via threads or clips, facilitating replacement after wear.

[0099] Deburring mechanism: When the precision-milled silicone pillar 16 rotates at high speed (linear velocity 5-15m / s), it comes into contact with the burr and uses the shearing force and friction generated by elastic deformation to peel the burr off the workpiece surface. Compared with metal cutting tools:

[0100] Low cutting force: avoids workpiece deformation and surface scratches;

[0101] Adaptability: Precision milling of silicone pillars can conform to the minute unevenness of the inner ring of the workpiece;

[0102] Safety: Even if the operator is accidentally exposed, it will not cause serious injury.

[0103] Recommendations for optimizing process parameters:

[0104] Coarse burrs (height > 0.3 mm): Rotation speed 1500-2000 r / min, feed rate 50 mm / min;

[0105] Fine burrs (height ≤ 0.3mm): Rotation speed 2000-2500r / min, feed rate 80mm / min;

[0106] Finishing: Rotation speed 1000-1500 r / min, feed speed 30 mm / min, to improve surface quality.

[0107] The center plate 20 is made of aluminum alloy profile or bent steel plate, and is fixed across between two fixed plates 1, located in the lower return section of the conveyor chain 4. The distance between the top surface of the center plate 20 and the bottom surface of the fixed device when it reaches this position is 5-10mm.

[0108] The protective box 21 is welded to the top of the center plate 20 and is made of stainless steel plate (SUS304), with dimensions of 200mm×150mm×100mm (length×width×height). The protective box 21 is equipped with a first air pump (not shown in the figure), which is a rotary vane vacuum pump or a diaphragm pump with a pumping speed ≥20L / min and an ultimate vacuum degree ≤-0.08MPa.

[0109] Among them, the connecting tube 22 and the elastic suction cup 23:

[0110] Connecting pipe 22 is made of oil-resistant rubber or PU gas pipe with an inner diameter of φ6-φ8mm and a length determined according to the layout.

[0111] The elastic suction cup 23 is made of nitrile rubber or silicone rubber, with a diameter of φ30-φ40mm;

[0112] The suction cup has an annular flange at the top, which forms a seal when it fits against the edge of the through hole 25.

[0113] Adsorption process: When the fixing device moves to the position of the center plate 20 along with the conveyor chain 4:

[0114] 1. The through holes 25 on the first fixed seat 6 and the second fixed seat 24 are aligned with the two elastic suction cups 23;

[0115] 2. The first air pump starts and draws air in through connecting pipe 22;

[0116] 3. The elastic suction cup 23 adheres to the edge of the through hole 25, forming a vacuum seal;

[0117] 4. When the vacuum level reaches -0.05MPa or higher, the workpiece can be reliably fixed;

[0118] 5. After processing is completed, the first air pump stops, the vacuum is released, and the fixing device can continue to move.

[0119] Sealing reliability assurance:

[0120] The edges of the through hole 25 should be chamfered at 0.5×45° to avoid scratching the elastic suction cup 23;

[0121] The hardness of the elastic suction cup 23 should be controlled between Shore A40 and A60. If it is too hard, the seal will be poor; if it is too soft, the lifespan will be short.

[0122] Regularly inspect the wear of the resilient suction cup 23; replace it when the surface crack depth is >1mm.

[0123] No-load cleaning function: When no injection molded part is placed in the first semi-circular groove 7, vacuum adsorption can still be performed to suck the burrs and debris in the groove into the protective box 21 through the through hole 25, thus achieving automatic cleaning. A cleaning door should be provided on the side of the protective box 21 for easy periodic removal of the collected debris.

[0124] The second air pump 30 and water pump 31 are fixed to the outer sides of the two upright plates 9, which are welded from channel steel or square tubing and have a height of 800-1000 mm. The relative positions of the two pumps should ensure that the first bend 28 and the second bend 29 can be accurately aligned with the inner ring of the workpiece.

[0125] Second air pump 30:

[0126] Type: Vortex air pump or Roots blower, air volume ≥100L / min, air pressure ≥0.05MPa;

[0127] Function: Generates a high-speed airflow to blow away residual debris and burrs after processing.

[0128] Water pump 31:

[0129] Type: Miniature centrifugal pump or diaphragm pump, flow rate ≥ 5 L / min, head ≥ 10 m;

[0130] Water source: Connect to the workshop's tap water or circulating water system. The water quality should be filtered to a particle diameter of <100μm.

[0131] Among them, the first bend 28 and the second bend 29:

[0132] Material: Stainless steel pipe or PVC pipe, inner diameter φ8-φ10mm;

[0133] Arrangement: The pipe end extends above the circular groove formed by the two first semicircular grooves 7, 20-30mm away from the upper edge of the inner ring of the workpiece;

[0134] Angle: Tilt the nozzle at 15-30° to avoid vertical spraying that could cause liquid splashing.

[0135] Cleaning and drying process flow:

[0136] 1. Air blowing stage: The second air pump 30 is started, and a high-speed airflow (flow velocity ≥20m / s) rushes into the inner ring of the workpiece to blow out loose debris and burrs for 5-10 seconds.

[0137] 2. Water washing stage: The second air pump 30 is turned off and the water pump 31 is started. The water is sprayed into the inner ring of the workpiece in the form of mist or column to wash away residual dust and attached debris for 10-15 seconds.

[0138] 3. Re-blowing stage: Water pump 31 is turned off, and the second air pump 30 is restarted to blow away the residual moisture in the inner ring of the workpiece for 10-15 seconds.

[0139] Precautions:

[0140] The air blowing and water washing stages should be staggered to avoid the water flow being dispersed by the airflow, which would reduce the cleaning effect;

[0141] A small amount of detergent (0.5%-1% concentration) can be added to the water for washing to improve its cleaning power, but it is necessary to ensure thorough drying afterwards.

[0142] The surface of the dried workpiece should be free of visible water droplets to prevent rusting or mold growth during storage.

[0143] Step 1: Material preparation

[0144] Check the tension and lubrication of conveyor chain 4;

[0145] Confirm that the air / water supply pressure of the first air pump, the second air pump 30, the water pump 31, and the cylinder 11 is normal;

[0146] Adjust the distance between the first fixed seat 6 and the second fixed seat 24 according to the workpiece specifications (if the specifications need to be replaced).

[0147] Step 2: Manual feeding

[0148] The operator places the ring-shaped injection molded part onto the fixed device at the loading station;

[0149] Ensure that the workpiece fits smoothly into the circular groove formed by the two first semicircular grooves 7;

[0150] Workpiece placement direction: The inner ring with more burrs should face upwards to facilitate subsequent precision milling.

[0151] Step 3: Transport and Adsorption Fixation

[0152] Start the first motor, and the conveyor chain 4 drives the fixed device to move;

[0153] The fixing device will automatically stop when it reaches the center plate 20 position (detected by a proximity switch or photoelectric sensor).

[0154] The first air pump starts, and the workpiece is fixed by adsorption through the elastic suction cup 23 and the through hole 25;

[0155] After adsorption is confirmed (by a vacuum pressure switch), it proceeds to the precision milling station.

[0156] Step 4: Finish milling to remove burrs

[0157] The fixing device stops when it reaches below the top plate 10;

[0158] Cylinder 11 extends, causing the semi-circular end mill 15 to descend and extend into the inner ring of the workpiece;

[0159] Start the drive motor 13, the semi-circular milling cutter 15 rotates, and the precision milled silicone pillar 16 contacts and rubs against the inner ring burr;

[0160] Depending on the condition of the burrs, the semi-circular end mill can be set to reciprocate 1-3 times to ensure thorough removal.

[0161] After the finish milling is completed, cylinder 11 retracts and the semi-circular end mill 15 is withdrawn.

[0162] Step 5: Clean and dry

[0163] The fixed device is moved to the cleaning station and undergoes three stages of treatment in sequence: air blowing, water washing, and air blowing.

[0164] After cleaning, there should be no visible debris or water stains on the inner ring of the workpiece.

[0165] Step 6: Automatic feeding

[0166] When the stationary device moves to the unloading station, the first air pump is turned off, and the vacuum is released;

[0167] Operators or robotic arms remove the processed workpieces;

[0168] The unloaded fixing device continues to operate, automatically cleaning the residual debris in the first semi-circular groove 7 through vacuum adsorption.

[0169] The equipment should be reliably grounded to prevent electrical leakage.

[0170] Rotating components (conveyor chain 4, gear 3, and semi-circular milling cutter 15) should be equipped with protective covers to prevent personnel from contacting them;

[0171] The emergency stop button should be located in an easily accessible position to ensure immediate shutdown in case of emergencies.

[0172] Processing safety:

[0173] During precision milling, operators must not put their hands into the machining area;

[0174] Regularly check the wear of the precision-milled silicone pillar 16. Any precision-milled silicone pillars that have fallen off or are severely worn should be replaced in time to prevent them from flying out and injuring people.

[0175] When blowing air or washing with water, wear protective glasses to prevent debris or liquid from splashing into your eyes.

[0176] Maintenance and safety:

[0177] Before performing equipment maintenance, the power and gas supply must be disconnected, and a warning sign must be hung.

[0178] When changing blades or cleaning debris, wait until the equipment has completely stopped running;

[0179] When working at heights (such as inspecting part 10 of the roof), safety ladders and safety belts should be used.

[0180] Among them, pre-processing inspection:

[0181] Inspect the condition of incoming workpieces; workpieces with severe deformation or cracks should be rejected.

[0182] Confirm that there are no residual debris in the first semicircular groove 7 to avoid affecting the positioning accuracy of the workpiece.

[0183] Monitoring during processing:

[0184] Monitor the vacuum adsorption pressure; if the pressure drops below -0.04 MPa, the machine should be stopped for inspection.

[0185] Listen to the operating sound of the equipment; abnormal noise may indicate bearing damage or chain jamming.

[0186] When scratches are found on the surface of the precision-milled workpiece, check the hardness of the precision-milled silicone pillar (16) or the tool speed.

[0187] Post-processing inspection:

[0188] Visual inspection or tactile inspection (wearing gloves to touch) is used to confirm the effectiveness of burr removal;

[0189] The sampling rate is recommended to be ≥10%, and 100% inspection should be carried out for key customers or the first batch of production.

[0190] Collect and weigh the residual debris to evaluate the efficiency of the cleaning system (target: residual debris per piece <0.1g).

Claims

1. A rotary milling cutter head for deburring injection molded automotive steering wheels, comprising a fixing plate (1), characterized in that, Two fixed plates (1) are provided and are arranged in parallel. Two rotating shafts (2) are rotatably arranged between the two fixed plates (1). Two gears (3) are sleeved on each of the two rotating shafts (2). A conveyor chain (4) is connected between the gears (3) on the same side of the two rotating shafts (2). One end of one of the rotating shafts (2) extends out of the fixed plate (1) and is connected to a first motor. Multiple fixing devices are provided on the two conveyor chains (4). The fixing devices include a first connecting plate (5) and a second connecting plate (19) fixed to the outer surface of the two conveyor chains (4). A gap is provided between the first connecting plate (5) and the second connecting plate (19). A first fixing seat (6) and a second fixing seat (24) are fixed to the top of the first connecting plate (5) and the second connecting plate (19), respectively. A first semi-circular groove (7) is opened at the top of the first fixing seat (6) and the second fixing seat (24). A through hole (25) is opened at the bottom of the two first semi-circular grooves (7). A center is provided below the first connecting plate (5) and the second connecting plate (19). Plate (20), the top of the center plate (20) is fixed with a protective box (21), the protective box (21) is equipped with a first air pump, the first air pump is connected to two connecting pipes (22), the top of the two connecting pipes (22) is connected to an elastic suction cup (23), the two elastic suction cups (23) are respectively attached to the through holes (25) at the corresponding positions; the outer sides of the two fixed plates (1) are fixed with brackets (8), the brackets (8) are fixed with upright plates (9), the top of the two upright plates (9) is fixed with a top plate (10), the top plate (10) 10) A cylinder (11) is fixed at the top. The telescopic end of the cylinder (11) extends out of the top plate (10) and is connected to a fixed plate (12). A drive motor (13) is fixed at the bottom of the fixed plate (12). A tool connecting shaft (14) is provided at the bottom of the drive motor (13). A semi-circular end mill (15) is detachably connected at the bottom of the tool connecting shaft (14). Multiple precision milling silicone pillars (16) are fixed on the outer ring of the semi-circular end mill (15). The semi-circular end mill (15) matches the circular groove formed by the two first semi-circular grooves (7).

2. The rotary milling cutter head for deburring injection molded automotive steering wheels according to claim 1, characterized in that: The bottom ends of the first connecting plate (5) and the second connecting plate (19) are both fixed with square plates (17), and a return spring (18) is connected between the two square plates (17).

3. The rotary milling cutter head for deburring injection molded automotive steering wheels according to claim 2, characterized in that: The first fixing seat (6) has a protruding end (27) on the side near the second fixing seat (24), and the second fixing seat (24) has a slot (26) on the side near the first fixing seat (6). The protruding end (27) is engaged in the inside of the slot (26), and the protruding end (27) is elastic.

4. The rotary milling cutter head for deburring injection molded automotive steering wheels according to claim 1, characterized in that: A second air pump (30) and a water pump (31) are fixed on the opposite sides of the two upright plates (9). A first bend (28) and a second bend (29) are connected to the opposite sides of the second air pump (30) and the water pump (31). One end of the first bend (28) and the second bend (29) extends into the top of the two first semicircular grooves (7).

5. A rotary milling cutter head for deburring injection molded automotive steering wheels according to claim 1, characterized in that: The semi-circular end mill (15) is designed with the round head facing down, and the number of precision milled silicone pillars (16) is 12-16, which are evenly distributed along the outer ring of the semi-circular end mill (15).

6. The rotary milling cutter head for deburring injection molded automotive steering wheels according to claim 1, characterized in that: The first fixing seat (6) and the second fixing seat (24) are made of nylon PA66+30% glass fiber, and the radius of the first semi-circular groove (7) is 0.5-1.0mm larger than the outer diameter of the workpiece.

7. A rotary milling cutter head for deburring injection molded automotive steering wheels according to claim 1, characterized in that: The elastic suction cup (23) is made of nitrile rubber or silicone rubber and has a diameter of φ30-φ40mm.

8. A rotary milling cutter head for deburring injection molded automotive steering wheels according to claim 1, characterized in that: The conveyor chain (4) adopts a double-pitch precision roller chain with a linear speed controlled at 0.5-1.0 m / min.

9. A rotary milling cutter head for deburring injection molded automotive steering wheels according to claim 1, characterized in that: The precision-milled silicone pillar (16) has a Shore hardness of A30-A50, a diameter of φ6-φ8mm, a height of 8-10mm, and a hemispherical top.

10. A rotary milling cutter head for deburring injection molded automotive steering wheels according to claim 1, characterized in that: The second air pump (30) has an air volume ≥100L / min and an air pressure ≥0.05MPa; the water pump (31) has a flow rate ≥5L / min and a head ≥10m.

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