Automobile headrest rod gear hobbing apparatus

Abstract

The utility model discloses a kind of automobile headrest rod gear hobbing equipment, including rack, machining table is equipped in rack, gear hobbing die set is detachably compressed on machining table, gear hobbing die set includes clamping assembly and gear hobbing cutter row assembly, first through-hole is equipped on machining table, first through-hole left and right sides are equipped with a die pushing track, the front end between two die pushing tracks is equipped with profiled draw tooth mechanism, profiled draw tooth mechanism includes upper fixed plate, lower fixed plate, servo motor one, die connecting piece, up-down transmission assembly and guide rail assembly, four support shafts are equipped between upper fixed plate, lower fixed plate, die connecting piece upper end is penetrated first through-hole, and then with gear hobbing cutter row assembly bottom detachably connected, servo motor one output shaft is connected with die connecting piece by up-down transmission assembly, guide rail assembly includes guide rail and slider, guide rail is connected between upper fixed plate, lower fixed plate, slider is equipped in die connecting piece side edge. The overall structure of this structure is simple, convenient to disassemble in later period.

Description

Technical Field

[0001] This utility model relates to the technical field of headrest rod gear hobbing, specifically to a gear hobbing device for automotive headrest rods. Background Technology

[0002] A car headrest is a driving comfort and safety feature. In a rear-end collision, the body is thrown backward due to inertia. The pressure from the vehicle's acceleration or deceleration is concentrated on the vulnerable neck and head, and the headrest acts as a cushion, protecting the head. A car headrest consists of a seat cushion, backrest, and headrest itself. Car headrests are mainly divided into adjustable and non-adjustable types. Adjustable car headrests connect to the car seat backrest via a headrest rod, and, depending on different needs, have teeth that connect to adjusters inside the car seat backrest to adjust the height.

[0003] However, existing headrest rod hobbing equipment, such as the automotive seat headrest rod hobbing machine disclosed in patent application number 201520909402.3, has the following problems:

[0004] 1. The method of hobbing the headrest rod is to use a quick cylinder to drive the tooth cutter to hob the teeth back and forth on the outer wall of the headrest rod. Because it is driven by a quick cylinder, it relies on compressed air to drive the piston movement. The structure is simple and the action is fast, but it is greatly affected by air pressure fluctuations. High-speed movement is prone to impact, wear and failure, and the speed and force are easily limited by air pressure.

[0005] 2. Existing headrest rod gear hobbing equipment has a relatively complex structure and the clamping mold and frame are fixedly connected, making disassembly inconvenient. Therefore, it needs to be improved. Utility Model Content

[0006] The purpose of this utility model is to provide a gear hobbing device for automotive headrest rods to solve the problems mentioned in the background art. The existing gear hobbing device for headrest rods uses a fast cylinder drive for gear hobbing. Since it relies on compressed air to drive the piston movement, the structure is simple and the action is fast, but it is greatly affected by air pressure fluctuations. High-speed movement is prone to impact, wear and failure, thus affecting the gear hobbing effect. The structure is relatively complex, and the clamping mold and frame are fixedly connected, making it inconvenient to disassemble later.

[0007] To achieve the above objectives, this utility model provides the following technical solution: a car headrest rod gear hobbing device, including a frame, a processing table inside the frame, a gear hobbing mold assembly detachably pressed onto the processing table, the gear hobbing mold assembly including a clamping component for clamping the headrest rod and a gear hobbing cutter assembly for performing gear hobbing operations on the headrest rod, a first through hole provided on the processing table, a mold pushing track symmetrically arranged on both sides of the first through hole, a mold positioning strip provided between the front ends of the two mold pushing tracks, and a forming gear pulling mechanism provided below the processing table that can be detachably connected to the gear hobbing cutter assembly and can drive the gear hobbing cutter assembly to move up and down. The forming gear hobbing mechanism includes an upper fixed plate, a lower fixed plate, a servo motor, a support optical shaft, a mold connector, an upper and lower transmission assembly, and a guide rail assembly. Four support optical shafts are arranged between the upper and lower fixed plates. The upper end of the mold connector passes through a first through hole and is detachably connected to the bottom of the gear hobbing cutter assembly. The output shaft of the servo motor is connected to the mold connector through the upper and lower transmission assembly, so that the servo motor drives the upper and lower transmission assembly to move up and down, thereby driving the mold connector to move up and down. The guide rail assembly includes a guide rail and a slider. The guide rail is connected between the upper and lower fixed plates, and the mold connector has a slider on its side that is slidably connected to the guide rail.

[0008] Preferably, to further ensure stability, the upper and lower transmission assembly includes a main synchronous pulley, an auxiliary synchronous pulley, a synchronous belt, and a lead screw. A servo motor is fixed to the lower fixed plate, and its output shaft passes through the lower fixed plate and connects to the main synchronous pulley. The auxiliary synchronous pulley is rotatably connected to the bottom of the lower fixed plate. A synchronous belt connects the main and auxiliary synchronous pulleys. One end of the lead screw passes through the lower fixed plate and connects to the center hole of the auxiliary synchronous pulley. A lead screw slide is fitted onto the lead screw. The mold connector is positioned below the lead screw slide. The guide rail assembly consists of two sets, each guide rail fixed to a vertical plate. The vertical plate is fixed between the upper and lower fixed plates. An L-shaped connecting plate is provided on both sides of the lead screw slide. A slider that slidably connects to the corresponding guide rail is provided on the outer side of each L-shaped connecting plate. A T-shaped slot is provided above the lead screw slide.

[0009] Preferably, to achieve faster adjustment speed, the upper and lower transmission assembly includes a coupling, a gear, and a rack. The servo motor is a dual-output structure, with each of its two output shafts connected to a gear via a coupling. Two spaced longitudinal plates are provided between the upper and lower fixed plates, each connected to a guide rail and a rack. The rack meshes with a corresponding gear. A connecting support is provided above the servo motor, and a slider that slides on the corresponding guide rail is provided behind the connecting support. A positioning connector for the detachable lower part of the mold connector is provided above the connecting support, and the positioning connector has a T-shaped slot.

[0010] Preferably, in order to facilitate insertion and subsequent disassembly, an inverted T-shaped connecting bracket one is provided below the mold connector, and a T-shaped connecting bracket two is provided above the mold connector.

[0011] Preferably, to simplify the overall clamping structure, the clamping assembly includes a lower mold fixing plate, a lower imitation molding plate, a sliding pressure plate, and an upper mold fixing plate. The lower mold fixing plate has a lower imitation molding plate, and the upper imitation molding plate, which engages with the lower imitation molding plate during mold closing, is located below the sliding pressure plate. The lower and upper imitation molding plates, when engaged, clamp the headrest rod. The sliding pressure plate and the upper mold fixing plate are fixed together by two longitudinal plates. The gear hobbing cutter assembly includes a cutter side feed mechanism and two cutter groups, which are slidably connected between the lower imitation molding plate, the upper imitation molding plate, and the sliding pressure plate. The tool rack assembly includes a tool rack support and a side-moving tool rack assembly slidably connected within the tool rack support. One or more initial hobbing gears are mounted on the tool rack support, and one or more side hobbing gears are mounted on the side of the side-moving tool rack assembly. The initial hobbing gears are used for initial hobbing operations on the headrest rod, and the side hobbing gears are used for finishing hobbing operations on the headrest rod. The tool rack side feed mechanism includes a second servo motor, a second gear, and a second rack. The output shaft of the second servo motor is connected to the second gear, which meshes with the second rack. The lower part of the second rack is connected to two side-moving tool rack assemblies via a connecting bracket.

[0012] Preferably, for ease of connection, the bottom of the hobbing cutter assembly is provided with a connecting frame two located below the lower die fixing plate, and a T-shaped slot three is provided below the connecting frame two to be inserted into the T-shaped connecting frame two. The lower ends of the two cutter brackets are connected to the upper end of the connecting frame two.

[0013] Preferably, in order to further tighten the mold, the processing table is provided with lower hydraulic clamping devices on both sides for clamping the sides of the lower mold fixing plate.

[0014] Preferably, in order to further tighten the mold, the processing table is also provided with four guide rods, and a hydraulic plate is fixed between the four guide rods. A fast cylinder is fixed on the hydraulic plate, and a movable plate that is slidably connected between the four guide rods is connected to the output end of the fast cylinder. Four upper hydraulic clamping devices for pressing the upper mold fixing plate around the perimeter are provided below the movable plate.

[0015] Preferably, in order to facilitate the limiting of the mold, the mold positioning strip is provided with two spaced bosses, and the side of the lower mold fixing plate is provided with a limiting groove that cooperates with the bosses.

[0016] Compared with the prior art, the beneficial effects of this utility model are:

[0017] 1. This mechanism is driven by a servo motor, with a synchronous pulley and belt installed at the bottom to drive the lead screw to rotate. The rotation of the lead screw drives the mold connecting parts to move up and down along the guide rail, thereby improving the stability of the up and down movement.

[0018] 2. Moreover, the detachable connection between the gear hobbing die assembly and the forming gear pulling mechanism facilitates the disassembly and replacement of different types of gear hobbing die assemblies, further improving the versatility of the equipment. Furthermore, the mold disassembly operation is simple. Loosen the upper and lower hydraulic clamps to release the fixed constraints on the mold, and push it along the dedicated track to complete the mold disassembly. The whole process is efficient and convenient, effectively saving loading and unloading time. Attached Figure Description

[0019] Figure 1 This is a frontal perspective view of a gear hobbing device for an automotive headrest rod in Embodiment 1.

[0020] Figure 2 This is a perspective view of the back structure of a gear hobbing device for an automotive headrest rod in Embodiment 1.

[0021] Figure 3 This is a schematic diagram of the internal structure of a car headrest rod gear hobbing device in Embodiment 1 when the external frame of the machine is removed. Figure 1 ;

[0022] Figure 4 This is a schematic diagram of the internal structure of a car headrest rod gear hobbing device in Embodiment 1 when the external frame of the machine is removed. Figure 2 ;

[0023] Figure 5 This is a schematic diagram of the bottom structure of the processing table in Embodiment 1;

[0024] Figure 6 This is a schematic diagram of the structure of the machining table in this embodiment 1 when there is no gear hobbing mold assembly, lower hydraulic clamp, or upper hydraulic clamp installed on the upper part of the machining table;

[0025] Figure 7 This is a schematic diagram of the mold connector in Example 1;

[0026] Figure 8 This is a schematic diagram of the gear hobbing die assembly in Example 1;

[0027] Figure 9 This is a schematic diagram of the gear hobbing die assembly in Example 1 without the installation of the upper die fixing plate and the longitudinal plate.

[0028] Figure 10 for Figure 9 A schematic diagram of the structure without the gearbox and one cutter head support;

[0029] Figure 11 This is a three-dimensional view of the structure of a car headrest rod gear hobbing device in Example 2 when there is no cabinet door installed below the frame;

[0030] Figure 12 This is a schematic diagram of the combined structure of the forming tooth-pulling mechanism and the mold connector in Example 2.

[0031] In the diagram: 1. Frame; 2. Machining table; 3. Gear hobbing die assembly; 3. Lower die fixing plate; 301. Lower imitation forming plate; 302. Sliding pressure plate; 304. Upper die fixing plate; 305. Cutter block support; 3021. Side-moving cutter block assembly; 3022. Side hobbing gear; 3023. Primary hobbing gear; 3024. Servo motor II; 3025. Gear II; 3026. Rack II; 3027. Connecting frame I; 3028. Mounting plate; 3029. Gear box; 3030. First through hole; 201. Die pushing track; 4. Die positioning bar; 5. Forming tooth pulling mechanism; 6. Upper fixing plate; 601. Lower fixing plate; 602. Servo motor I; 603. Support optical shaft; 604. Die connecting piece; 605. Upper and lower transmission assembly; 606. Main synchronous pulley; 6011. Auxiliary synchronous pulley; 6012. Synchronous belt; 6013. Lead screw. 6014, Screw slide block; 6015, Coupling; 6011-1, Gear 1; 6011-2, Rack 1; 6011-3, Guide rail; 7, Slider; 8, Longitudinal plate 1; 9, Longitudinal plate 2; 10, Connecting support; 11, Positioning connector; 12, T-slot 2; 13, T-connecting frame 1; 14, T-connecting frame 2; 15, Longitudinal plate 3; 16, Connecting frame 2; 17, T-slot 3; 18, Lower hydraulic clamp; 19, Guide rod; 20, Hydraulic plate; 21, Quick cylinder; 22, Moving plate; 23, Upper hydraulic clamp; 24, Boss; 25, Limiting groove; 26, L-shaped connecting plate; 27, T-slot 1; 28, Main control box; 29, Cabinet door 1; 30, Human-machine interface; 31, Safety light curtain; 32, Cabinet door 2; 33, Servo hydraulic system; 34, Head pin rod; 35, Locking hook; 36, Locking buckle; 37. Detailed Implementation

[0032] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0033] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0034] Example 1

[0035] Please see Figures 1-10As shown in the figure, this embodiment discloses a gear hobbing device for automotive headrest rods, including a frame 1. A processing table 2 is disposed within the frame 1. A gear hobbing die assembly 3 is detachably pressed onto the processing table 2. The gear hobbing die assembly 3 includes a clamping component for clamping the headrest rod and a gear hobbing cutter assembly for performing gear hobbing operations on the headrest rod. A first through hole 201 is provided on the processing table 2. A die pushing track 4 is symmetrically arranged on both sides of the first through hole 201. A die positioning strip 5 is provided between the front ends of the two die pushing tracks 4. The gear hobbing die assembly 3 is slidably connected to the two die pushing tracks 4 and can be positioned and engaged with the die positioning strip 5. Below the processing table 2 is a device that can be detachably connected to the gear hobbing cutter assembly. A forming tooth-pulling mechanism 6 is provided to drive the hobbing cutter assembly to move up and down. The forming tooth-pulling mechanism 6 includes an upper fixed plate 601, a lower fixed plate 602, a servo motor 603, supporting optical shafts 604, a mold connector 605, an up-and-down transmission assembly 606, and a guide rail assembly. Four supporting optical shafts 604 are arranged between the upper fixed plate 601 and the lower fixed plate 602. The upper end of the mold connector 605 passes through a first through hole 201 and is detachably connected to the bottom of the hobbing cutter assembly. The output shaft of the servo motor 603 is connected to the mold connector 605 through the up-and-down transmission assembly 606, enabling the servo motor 603 to drive the up-and-down transmission assembly 606 to move up and down, thereby driving the mold connector 605 to move up and down. The guide rail assembly includes a guide rail 7 and a slider 8. The guide rail 7 is connected between the upper fixed plate 601 and the lower fixed plate 602. The mold connector 605 has a slider 8 on its side that is slidably connected to the guide rail 7. In this embodiment, an opening is provided above the front end of the frame 1 to facilitate viewing the status of the gear hobbing mold assembly 3. A cabinet door 30 is hinged to the rear of the frame 1 to allow the gear hobbing mold assembly 3 to move from between the two mold push rails 4 to the front end of the frame 1 after the cabinet door 30 is opened. Finally, it engages with the mold positioning strip 5 to limit the movement of the gear hobbing mold assembly 3. A main control box 29 for controlling the operation of the entire equipment is provided on the right side of the frame 1. The front end of the main control box 29 is provided with a part that is electrically connected to the main control box 29. The machine interface 31 is provided, and a safety light curtain 32 is provided on both sides of the front opening of the frame 1. The safety light curtain 32 uses infrared beams to detect foreign object intrusion in dangerous areas and protect the personal safety of operators. At the same time, for the convenience of later maintenance, a cabinet door 33 is hinged to the lower front of the frame 1. After opening the cabinet door 33, the forming tooth pulling mechanism 6 can be exposed, which is convenient for later maintenance of the forming tooth pulling mechanism 6. In addition, in this embodiment, in order to prevent machine collision, upper and lower limit sensors (not marked in the figure) are provided on the sides of the upper fixed plate 601 and the lower fixed plate 602. When the tooth hobbing mold group 3 moves to the upper or lower limit position, the corresponding limit sensor will sense it in time and trigger an alarm, and the equipment will stop running.

[0036] Preferably, to further ensure stability, the upper and lower transmission assembly 606 includes a main synchronous pulley 6011, an auxiliary synchronous pulley 6012, a synchronous belt 6013, and a lead screw 6014. The servo motor 603 is fixed to the lower fixed plate 602. The output shaft of the servo motor 603 passes through the lower fixed plate 602 and connects to the main synchronous pulley 6011. The auxiliary synchronous pulley 6012 is rotatably connected to the bottom of the lower fixed plate 602. A synchronous belt 6013 connects the main synchronous pulley 6011 and the auxiliary synchronous pulley 6012. One end of the lead screw 6014 passes through the lower fixed plate 602 and connects to the center hole of the auxiliary synchronous pulley 6012. A lead screw slide 6015 is fitted onto the lead screw 6014. Below the mold connecting piece 605... The guide rail assembly is arranged on the lead screw slide 6015. There are two sets of guide rails 7, each of which is fixed on a vertical plate 9. The vertical plate 9 is fixed between the upper fixed plate 601 and the lower fixed plate 602. There is an L-shaped connecting plate 27 on both sides of the lead screw slide 6015. There is a slider 8 on the outer side of the L-shaped connecting plate 27 that is slidably connected to the corresponding guide rail 7. There is a T-shaped slot 28 on the top of the lead screw slide 6015. There is an inverted T-shaped connecting frame 14 below the mold connector 605. There is a T-shaped connecting frame 25 above the mold connector 605. During assembly, the T-shaped connecting frame 14 and the T-shaped slot 28 are inserted to connect the mold connector 605 and the forming tooth pulling mechanism 6.

[0037] Preferably, to simplify the overall clamping structure, the clamping assembly includes a lower mold fixing plate 301, a lower imitation plate 302, a sliding pressure plate 304, and an upper mold fixing plate 305. The lower mold fixing plate 301 is mounted between two mold pushing tracks 4. The lower mold fixing plate 302 is mounted on the lower mold fixing plate 301. An upper imitation plate 303 is mounted below the sliding pressure plate 304 to cooperate with the lower imitation plate 302 when the mold is closed. The lower imitation plate 302 and the upper imitation plate 303 are used to clamp the headrest rod after they cooperate. The sliding pressure plate 304 and the upper mold fixing plate 305 are fixed together by two longitudinal plates 316. The gear hobbing cutter assembly includes a cutter side feed mechanism and two cutter groups. The two cutter groups slide... The tool post assembly is dynamically connected between the lower imitation plate 302, the upper imitation plate 303, and the sliding pressure plate 304. The tool post assembly includes a tool post support 3021 and a side-moving tool post assembly 3022 slidably connected within the tool post support 3021. One or more initial hobbing gears 3024 are provided on the tool post support 3021 (the specific number of initial hobbing gears 3024 can be set according to actual conditions). One or more side hobbing gears 3023 are provided on the side of the side-moving tool post assembly 3022 (the specific number of side hobbing gears 3023 can be set according to actual conditions). The initial hobbing gears 3024 are used for initial hobbing operations on the headrest rod, and the side hobbing gears 3023 are used for finishing hobbing operations on the headrest rod. The tool post side feed... The mechanism includes a servo motor 3025, a gear 3026, and a rack 3027. The output shaft of the servo motor 3025 is connected to the gear 3026, which meshes with the rack 3027. The rack 3027 is connected to two side-moving cutter sets 3022 via a connecting frame 3028. For easier connection, the bottom of the hobbing cutter set assembly has a connecting frame 17 located below the lower die fixing plate 301. The bottom of the two cutter set supports 3021 passes through the sliding pressure plate 304, the upper imitation plate 303, the lower imitation plate 302, and the lower die fixing plate 301 in sequence, and then connects to the top of the connecting frame 17. The bottom of the connecting frame 17 is provided with a T-shaped... The T-shaped slot 18 of the connecting bracket 2 15 is inserted into the connecting bracket 2 17. The lower part of the two tool post supports 3021 is connected to the upper part of the connecting bracket 2 17. The upper part of the two tool post supports 3021 is connected to the mounting plate 3029. The gear box 3030 is installed on the mounting plate 3029. The servo motor 2 3025 is installed outside the gear box 3030. The output shaft of the servo motor 2 3025 is inserted into the gear box 3030 and connected to the gear 2 3026. The connecting bracket 1 3028 is located below the mounting plate 3029. The rack 2 3027 passes through the mounting plate 3029 and is connected to the connecting bracket 1 3028. In order to lock the lower imitation plate 302 and the upper imitation plate 303 together, locking hooks 36 are hinged on both sides of the lower imitation plate 302.The upper imitation plate 303 is provided with a latch 37 on its side, which locks with the latch 36. During operation, the latch 36 and latch 37 are first separated. At this time, the sliding pressure plate 304 synchronously drives the upper imitation plate 303 to move up and down along the two blade support brackets 3021, ensuring that the distance between the lower imitation plate 302 and the upper imitation plate 303 increases. Then, the head needle rod 35 is manually placed in the imitation groove of the lower imitation plate 302, and the sliding pressure plate 304 is driven to move down, ensuring that the lower imitation plate 302 and the upper imitation plate 303 are pressed together. The imitation groove below the upper imitation plate 303 cooperates with the imitation groove of the lower imitation plate 302 to press the head needle rod 35 between the lower and upper imitation plates 302 and 303. The latch 36 on both sides rotates and engages with the latch 37 to achieve the same effect as the lower imitation plate 302. 2. The head pin rod 35 is initially fixed by locking the upper imitation plate 303, and then the entire hobbing die assembly 3 is placed on the processing table 2. During operation, the side feed mechanism of the cutter bar is mainly used in conjunction with the hobbing die. The servo motor 3025 drives the gear 3026 to rotate, which synchronously drives the rack 3027 to move up and down along the gear box 3030, and synchronously drives the connecting frame 3028 to move up and down. Finally, it drives the side moving cutter bar assembly 3022 on both sides below the connecting frame 3028 to move up and down along the cutter bar support 3021. The side hobbing gear 3023 on the side of the side moving cutter bar assembly 3022 performs a hobbing operation on the side of the head pin rod 35, thus realizing the lateral feed of the entire hobbing die rollers. This ensures a more stable structure and eliminates the need for external springs and other assistance, ensuring faster and smoother operation.

[0038] Meanwhile, to further compress the mold, lower hydraulic clamping devices 19 are respectively provided on both sides of the processing table 2 for pressing the sides of the lower mold fixing plate 301; in this embodiment, the lower hydraulic clamping device 19 is a pneumatic clamp that can rotate 90 degrees; during operation, when the entire gear hobbing mold assembly 3 slides between the two mold pushing tracks 4 and engages with the mold positioning strip 5, the lower hydraulic clamping device 19 is used to rotate 90 degrees and clamp the sides of the lower mold fixing plate 301 from the side; similarly, to further compress the mold, four guide rods 20 are also provided on the processing table 2, and a hydraulic plate 21 is fixed between the four guide rods 20. A quick cylinder 22 is fixed on the hydraulic plate 21, and a moving plate 23 that is slidably connected between the four guide rods 20 is connected to the output end of the quick cylinder 22. Four upper hydraulic clamping devices 24 for pressing the sides of the upper mold fixing plate 305 are provided below the moving plate 23; The upper hydraulic clamp 24 is a pneumatic clamp capable of rotating 90 degrees. During operation, when the entire gear hobbing die assembly 3 slides between the two die pushing tracks 4 and engages with the die positioning strip 5, the fast cylinder 22 is driven to move the moving plate 23 downward, pressing the upper die fixing plate 305. Then, the upper hydraulic clamp 24 is used to rotate 90 degrees and clamp the upper hydraulic clamp 24 from the side, thus achieving the pressing effect on the entire gear hobbing die assembly 3. This prevents the gear hobbing effect from being affected by the random movement of the gear hobbing die assembly 3 during the gear hobbing process. Ultimately, the mold is firmly stabilized by the hydraulic clamp, ensuring that the mold will not shift during gear hobbing. Furthermore, a servo hydraulic system 34 is installed below the processing table 101, which is connected to the oil pipes on the fast cylinder 22 and the hydraulic clamp. The servo hydraulic system 34 is used to pressurize or depressurize the fast cylinder 22 and the hydraulic clamp, enabling the corresponding equipment to operate.

[0039] Preferably, to facilitate mold positioning, the mold positioning strip 5 is provided with two spaced bosses 25, and the lower mold fixing plate 301 has a limiting groove 26 on its side that mates with the bosses 25. In this embodiment, when the lower mold fixing plate 301 moves from back to front along the two mold pushing tracks 4, the front limiting groove 26 will slowly approach the bosses 25 until it engages with the bosses 25, indicating that the entire gear hobbing mold assembly 3 has moved into place and does not need to move further forward. This structure, by setting two mold pushing tracks 4 on the processing table 2 to form a dedicated track, facilitates the user to accurately push the gear hobbing mold assembly 3 against the mold positioning strip 5, and by adding a mold... The positioning bar 5 provides a limiting function to ensure accurate mold positioning and effectively prevent mold misalignment. The mold is pushed into the frame from back to front and removed from front to back. In this structure, the frame 1 is made of high-quality carbon steel and welded steel plates. Later, the parameters can be adjusted on the human-machine interface 31 to achieve one-time gear hobbing, accurate dimensions, and easy operation. The parameters can be saved and easily recalled. The entire mold closing adopts a servo hydraulic control system, which has fast closing speed, accurate positioning, and easy pressure parameter adjustment. In addition, the entire equipment is equipped with an external pressure regulating valve. If the working pressure is exceeded, the equipment will automatically alarm and stop.

[0040] The working principle of the entire equipment is as follows: First, the headrest rod 35 is manually placed inside the gear hobbing die assembly 3. Then, the entire gear hobbing die assembly 3 is moved forward from the rear of the frame 1 along the two die push rails 4 until the front of the gear hobbing die assembly 3 is locked in the die positioning strip 5. At this time, the die connector 605 of the lower gear hobbing die assembly 3 is locked in the forming tooth pulling mechanism 6 (in the initial state, the height of the die connector 605 above the forming tooth pulling mechanism 6 should be just enough to allow the die connector 605 to be locked in the position below the gear hobbing die assembly 3). Then, press down the front end of the frame 1. Start button; the hydraulic clamping device operates, clamping and positioning the gear hobbing die assembly 3. Then, the forming and pulling mechanism 6 operates, driven by servo motor 603, which rotates the main synchronous pulley 6011. Simultaneously, under the action of synchronous belt 6013, the auxiliary synchronous pulley 6012 rotates, which in turn rotates the lead screw 6014. When the lead screw 6014 rotates, the lead screw slide 6015 on the lead screw 6014 moves up and down. When the lead screw slide 6015 moves up and down, it drives the L-shaped connecting plate 27 to move up and down, which in turn drives the die connecting piece 605 to move up and down, ultimately realizing the gear hobbing. The movement of mold assembly 3 ultimately drives the cutter holder 3021 to move up and down, and utilizes the initial hobbing gear 3024 on the side of the cutter holder 3021 for up and down feeding and hobbing, thereby completing the initial hobbing with a depth of 0.5mm-1mm. Then, the forming and pulling mechanism 6 drives the cutter holder 3021 to move downward until it drives the side-moving cutter assembly 3022 to the side of the head needle bar 35. Then, it drives the cutter side feeding mechanism to work, which drives the second gear 3026 to rotate through the second servo motor 3025, and synchronously drives the second rack 3027 to move up and down along the gear box 3030, and synchronously drives the connecting frame. The 3028 moves up and down, ultimately driving the side-moving cutter groups 3022 on both sides below the connecting frame 3028 to move up and down along the cutter support 3021. The side-moving cutter groups 3022 utilize the side-rolling gears 3023 on their sides to perform gear hobbing on the side of the head pin rod 35. Through the side-feeding mechanism, the gear hobbing mold group 3 is fed in segments according to set values, ultimately achieving coordinated forming of the gear pulling mechanism 6 with the gear hobbing mold group 3. The gears are then fed along a set trajectory for deburring and forming, ultimately completing the burr-free gear hobbing operation of the headrest rod. Then, the upper and lower molds are closed and opened, the product is removed, and manual unloading is achieved. Therefore, this structure has the following technical effects:

[0041] 1. This mechanism is driven by a servo motor, with a synchronous pulley and belt installed at the bottom to drive the lead screw to rotate. The rotation of the lead screw drives the mold connecting parts to move up and down along the guide rail, thereby improving the stability of the up and down movement.

[0042] 3. Moreover, the gear hobbing die assembly 3 and the forming gear pulling mechanism 6 are detachably connected, which facilitates the disassembly and replacement of different types of gear hobbing die assemblies 3 in the later stage, further improving the versatility of the equipment. In addition, the disassembly of the die is simple. Loosen the upper and lower hydraulic clamps, release the fixed constraints on the die, and push it along the special track to the track to complete the die disassembly. The whole process is efficient and convenient, effectively saving loading and unloading time.

[0043] Example 2

[0044] Please see Figure 11 , Figure 12 As shown, the general structure of the car headrest rod gear hobbing device disclosed in this embodiment is the same as that in Embodiment 1. The difference is that, in order to make the adjustment speed faster, the upper and lower transmission assembly 606 adopts another implementation method. The upper and lower transmission assembly 606 includes a coupling 6011-1, a gear 6011-2, and a rack 6011-3. The servo motor 603 has a dual-output structure. The two output shafts of the servo motor 603 are respectively connected to a gear 6011-2 through a coupling 6011-1. Two spaced longitudinal plates 10 are arranged between the upper fixed plate 601 and the lower fixed plate 602. Each longitudinal plate 10 is connected to a guide rail 7 and a rack 6011-3. The rack 6011-3 meshes with a corresponding gear 6011-2. A connecting support 11 is arranged above the servo motor 603. A sliding support is arranged behind the connecting support 11 to slide with the corresponding guide rail 7. The connecting slider 8 is provided above the connecting support 11, and a positioning connector 12 for detachable connection of the mold connector 605 is provided below. The positioning connector 12 is provided with a T-shaped slot 13. During installation, the T-shaped slot 13 is inserted into the inverted T-shaped connecting frame 14 below the mold connector 605 to realize the connection operation between the mold connector 605 and the forming tooth pulling mechanism 6. In this embodiment, the upper and lower transmission component 606 in the forming tooth pulling mechanism adopts another transmission method. It is driven by a servo motor 603 with a dual output structure, which drives the gears 6011-2 on both sides to move up and down along the racks 6011-3 on both sides, thereby adjusting the height of the positioning connector 12, and finally adjusting the height of the mold connector 605. This method of adjustment ensures faster adjustment speed. It should be noted that the other structures in this embodiment are the same as those in embodiment 1, and the operation functions are also the same, so they will not be described in detail.

[0045] 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 gear hobbing device for automotive headrest rods, comprising a frame (1), wherein a processing table (2) is provided inside the frame (1), characterized in that: The processing table (2) is detachably press-fitted with a gear hobbing mold assembly (3). The gear hobbing mold assembly (3) includes a clamping component for clamping the headrest rod and a gear hobbing cutter assembly for performing gear hobbing operations on the headrest rod. The processing table (2) is provided with a first through hole (201). A mold pushing track (4) is symmetrically arranged on both the left and right sides of the first through hole (201). A mold positioning strip (5) is provided between the front ends of the two mold pushing tracks (4). A forming tooth pulling mechanism (6) is provided below the processing table (2) that can be detachably connected to the gear hobbing cutter assembly and can drive the gear hobbing cutter assembly to move up and down. The forming tooth pulling mechanism (6) includes an upper fixing plate (601), a lower fixing plate (602), a servo motor (603), a support optical axis (604), a mold connector (605), and upper and lower... The transmission assembly (606) and guide rail assembly are provided. Four supporting optical shafts (604) are provided between the upper fixed plate (601) and the lower fixed plate (602). The upper end of the mold connector (605) passes through the first through hole (201) and is detachably connected to the bottom of the hobbing cutter assembly. The output shaft of the servo motor (603) is connected to the mold connector (605) through the upper and lower transmission assembly (606) to realize the operation of the servo motor (603) to drive the upper and lower transmission assembly (606) to move up and down, thereby driving the mold connector (605) to move up and down. The guide rail assembly includes a guide rail (7) and a slider (8). The guide rail (7) is connected between the upper fixed plate (601) and the lower fixed plate (602). The mold connector (605) has a slider (8) on its side that is slidably connected to the guide rail (7).

2. The gear hobbing equipment for automotive headrest rods according to claim 1, characterized in that: The aforementioned upper and lower transmission assembly (606) includes a main synchronous pulley (6011), an auxiliary synchronous pulley (6012), a synchronous belt (6013), and a lead screw (6014). A servo motor (603) is fixed to a lower fixed plate (602). The output shaft of the servo motor (603) passes through the lower fixed plate (602) and connects to the main synchronous pulley (6011). The auxiliary synchronous pulley (6012) is rotatably connected to the bottom of the lower fixed plate (602). A synchronous belt (6013) connects the main synchronous pulley (6011) and the auxiliary synchronous pulley (6012). One end of the lead screw (6014) passes through the lower fixed plate (602) and connects to the auxiliary synchronous pulley (6014). The screw rod (6014) is connected to the center hole of the screw rod (6015), and the screw rod slide (6015) is fitted on the screw rod slide (6015) below the mold connector (605). The guide rail assembly consists of two sets, and each guide rail (7) is fixed on a vertical plate (9). The vertical plate (9) is fixed between the upper fixed plate (601) and the lower fixed plate (602). An L-shaped connecting plate (27) is provided on both sides of the screw rod slide (6015). A slider (8) is provided on the outer side of the L-shaped connecting plate (27) and is slidably connected to the corresponding guide rail (7). A T-shaped slot (28) is provided on the top of the screw rod slide (6015).

3. The gear hobbing equipment for automotive headrest rods according to claim 1, characterized in that: The upper and lower transmission assembly (606) includes a coupling (6011-1), a gear (6011-2), and a rack (6011-3). The servo motor (603) has a dual-output structure. The two output shafts of the servo motor (603) are respectively connected to a gear (6011-2) through a coupling (6011-1). Two spaced longitudinal plates (10) are provided between the upper fixed plate (601) and the lower fixed plate (602). Each longitudinal plate (10) is connected to a guide rod. The guide rail (7) and a rack (6011-3) mesh with a corresponding gear (6011-2). A connecting support (11) is provided above the servo motor (603). A slider (8) that is slidably connected to the corresponding guide rail (7) is provided behind the connecting support (11). A positioning connector (12) that is detachably connected to the mold connector (605) is provided above the connecting support (11). A T-shaped slot (13) is provided on the positioning connector (12).

4. The gear hobbing equipment for automotive headrest rods according to claim 1, 2, or 3, characterized in that: An inverted T-shaped connecting frame one (14) is provided below the mold connector (605), and a T-shaped connecting frame two (15) is provided above the mold connector (605).

5. The gear hobbing equipment for automotive headrest rods according to claim 4, characterized in that: The clamping assembly includes a lower mold fixing plate (301), a lower imitation plate (302), a sliding pressure plate (304), and an upper mold fixing plate (305). The lower mold fixing plate (301) is provided with the lower imitation plate (302). The upper imitation plate (303) is provided below the sliding pressure plate (304) and can cooperate with the lower imitation plate (302) when the mold is closed. The lower imitation plate (302) and the upper imitation plate (303) are used to clamp the headrest rod after they are engaged. The sliding pressure plate (304) and the upper mold fixing plate (305) are fixed together by two longitudinal plates (16). The hobbing cutter assembly includes a cutter side feed mechanism and two cutter groups. The two cutter groups are slidably connected between the lower imitation plate (302), the upper imitation plate (303), and the sliding pressure plate (304). The cutter group includes a cutter support (3021) and a cutter support slidably connected to the cutter support. The side-moving cutter group (3022) is located inside the frame (3021). One or more primary hobbing gears (3024) are provided on the cutter support (3021), and one or more side hobbing gears (3023) are provided on the side of the side-moving cutter group (3022). The primary hobbing gears (3024) are used to perform primary hobbing operations on the headrest rod, and the side hobbing gears (3023) are used to perform finishing hobbing operations on the headrest rod. The cutter side feed mechanism includes a second servo motor (3025), a second gear (3026), and a second rack (3027). The output shaft of the second servo motor (3025) is connected to the second gear (3026), and the second gear (3026) meshes with the second rack (3027). The lower part of the second rack (3027) is connected to the two side-moving cutter groups (3022) through a first connecting frame (3028).

6. The gear hobbing equipment for automotive headrest rods according to claim 5, characterized in that: The bottom of the hobbing cutter assembly is provided with a connecting frame two (17) located below the lower die fixing plate (301). Below the connecting frame two (17) is a T-shaped slot three (18) that is inserted into the T-shaped connecting frame two (15). The two cutter brackets (3021) are connected to the upper end of the connecting frame two (17).

7. The gear hobbing equipment for automotive headrest rods according to claim 5, characterized in that: The processing table (2) is provided with lower hydraulic clamps (19) on both sides for pressing the sides of the lower mold fixing plate (301).

8. The gear hobbing equipment for automotive headrest rods according to claim 5, characterized in that: The processing table (2) is also provided with four guide rods (20), and a hydraulic plate (21) is fixed between the four guide rods (20). A fast cylinder (22) is fixed on the hydraulic plate (21). A movable plate (23) is slidably connected between the four guide rods (20) at the output end of the fast cylinder (22). Four upper hydraulic clamping devices (24) for pressing the upper mold fixing plate (305) around the bottom of the movable plate (23) are provided.

9. The gear hobbing equipment for automotive headrest rods according to claim 5, characterized in that: The mold positioning bar (5) is provided with two spaced bosses (25), and the side of the lower mold fixing plate (301) is provided with a limiting groove (26) that cooperates with the bosses (25).

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