Grinding device for multi-start worm

Abstract

The utility model discloses a kind of grinding device of multi-start worm, including bed base, installing centre device on one end of bed base, installing power chuck at the other end, the sliding installation grinding wheel frame sliding table on bed base, servo drive motor is installed on the lateral wall of bed base, the output end of servo drive motor is connected with precision ball screw, the precision ball screw is threadedly cooperated with grinding wheel frame sliding table, two groups of grinding units are correspondingly provided on grinding wheel frame sliding table.The utility model uses two groups of grinding units to grind worm simultaneously on both sides, so that the material removal amount error of worm on both sides is ≤±0.01mm.It is verified by actual measurement, and the straightness error of workpiece after processing is ≤0.02mm / m, which is more than 80% higher in precision than traditional unilateral grinding.

Description

Technical Field

[0001] This utility model relates to the field of worm gear grinding technology, specifically a grinding device for a multi-start worm gear. Background Technology

[0002] Multi-start worm gears, as core components of precision transmission systems, are widely used in high-end equipment fields such as aerospace reducers and industrial robot joints. While their unique multi-start helical tooth structure significantly improves transmission efficiency and load-bearing capacity, the following technical bottlenecks exist in their manufacturing process: Traditional grinding processes use a single grinding wheel with unidirectional feed, which causes radial shear stress concentration in the worm gear, easily leading to bending deformation (measured deflection reaches 0.1-0.3mm), and the straightness error of the finished product exceeds the tolerance rate by as much as 8%. The existing equipment only has basic feed functions and cannot achieve dynamic correction of grinding angles.

[0003] Therefore, how to solve the problems existing in the above-mentioned technologies has become an urgent issue for technicians in this field. Utility Model Content

[0004] This invention provides a grinding device for multi-head worm gears, which can completely solve the technical problems existing in the prior art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: A multi-start worm gear grinding device includes a bed base, a center device installed at one end of the bed base, a power chuck installed at the other end, a grinding wheel head slide slidably installed on the bed base, a servo drive motor installed on the side wall of the bed base, and a precision ball screw connected to the output end of the servo drive motor. The precision ball screw is threadedly engaged with the grinding wheel head slide, and two sets of grinding units are correspondingly arranged on the grinding wheel head slide.

[0006] Furthermore, a grinding unit is provided at one end of the grinding wheel slide, and a fine-tuning slide is slidably provided at the other end. Another grinding unit is provided on the fine-tuning slide. A fine-tuning servo motor is installed on the side wall of the grinding wheel slide. The output end of the fine-tuning servo motor is connected to a fine-tuning precision ball screw, which is threadedly engaged with the fine-tuning slide.

[0007] Furthermore, both the bottom of the top device and the power chuck are provided with workpiece clamping bases, and a connecting rod is connected between the two ends of the grinding wheel frame slide to form a rectangular mating hole, which slides with the workpiece clamping base.

[0008] Furthermore, the grinding unit includes an external gear rotary frame, four servo electric cylinders, a main inner frame, and a secondary inner frame. The external gear rotary frame is movably mounted on a grinding head mounting base. Four servo electric cylinders are uniformly fixedly mounted circumferentially on the grinding head mounting base. The output ends of the servo electric cylinders are fixedly connected to a fixing ring. The external gear rotary frame rotatably engages with the fixing ring. The main inner frame and the secondary inner frame are fixedly mounted inside the external gear rotary frame. A pulley, a double-drive gear, and a grinding disc are rotatably arranged between the main inner frame and the secondary inner frame. The pulley and the double-drive gear are driven by a drive belt. Driven gears are symmetrically mounted on both sides of the grinding disc. The double-drive gear meshes with the driven gear. A main drive motor is mounted on the outer wall of the secondary inner frame. The output end of the main drive motor is connected to the pulley.

[0009] Furthermore, the grinding disc is a gear-shaped grinding disc.

[0010] Furthermore, an angle adjustment motor is fixedly installed on the top of both the grinding wheel frame slide and the fine-tuning slide. The output end of the angle adjustment motor is connected to an external gear meshing gear, which meshes with the external gear rotating frame.

[0011] Furthermore, the bottom sides of the bed base are detachably connected with guide load-bearing plates to form two sliding grooves, and the bottom of the outer wall of the grinding wheel frame slide extends outward with a sliding plate, which slides in the sliding groove.

[0012] Preferably, the end of the bed base away from the servo drive motor is provided with a cantilever bracket, and a hydraulic push rod is installed on the cantilever bracket. The output end of the hydraulic push rod is connected to the workpiece clamping base.

[0013] Preferably, the outer wall of the servo electric cylinder is provided with grooved heat dissipation fins.

[0014] Preferably, coolant nozzles are provided at both ends of the grinding wheel frame slide corresponding to the grinding disc.

[0015] This utility model provides a grinding device for a multi-start worm gear. It has the following beneficial effects: Two grinding units are set up correspondingly along the axis of the grinding wheel head slide, and are driven by a precision ball screw system to ensure that the material removal error on both sides of the worm is ≤±0.01mm. Actual measurements show that the straightness error of the machined workpiece is ≤0.02mm / m, improving accuracy by more than 80% compared to traditional single-sided grinding. The fine-tuning servo motor adjusts the relative position between the two grinding heads in real time (adjustment range 0-50mm). Combined with the adaptive deflection adjustment of the angle adjustment motor, it can automatically compensate for uneven force caused by clamping deviation or thermal deformation, eliminating more than 90% of the reliance on manual adjustment. Attached Figure Description

[0016] Figure 1 This is a perspective view of the present utility model; Figure 2 This is a partial sectional view of the present invention; Figure 3 This is an exploded view of the present invention; Figure 4 This is a partial cross-sectional view of the grinding unit in this utility model; Figure 5 This is an exploded view of the grinding unit in this utility model.

[0017] In the diagram: 1. Bed base; 2. Workpiece clamping base; 3. Grinding wheel head slide; 4. Grinding unit; 401. External gear rotary frame; 402. Servo electric cylinder; 403. Main inner frame; 404. Secondary inner frame; 405. Pulley; 406. Double transmission gear; 407. Grinding disc; 408. Transmission belt; 409. Main drive motor; 4010. Angle adjustment motor; 4011. External gear meshing gear; 4012. Fixing ring; 5. Connecting rod; 6. Fine-tuning servo motor; 7. Fine-tuning precision ball screw; 8. Fine-tuning slide; 9. Grinding head mounting base; 11. Servo drive motor; 12. Precision ball screw; 13. Guide bearing plate; 14. Cantilever bracket; 15. Hydraulic push rod; 16. Center device; 17. Power chuck. Detailed Implementation

[0018] The technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0019] Please see Figures 1-5 A grinding device for a multi-start worm gear includes a bed base 1. A center device 16 is installed at one end of the bed base 1, and a power chuck 17 is installed at the other end. The power chuck 17 is driven to rotate by a servo motor, and works in conjunction with the center device 16 to achieve rigid support at both ends of the worm gear workpiece. The center device 16 and the power chuck 17 are both prior art and will not be described in detail here.

[0020] The grinding wheel frame slide 3 is slidably mounted on the bed base 1. A servo drive motor 11 is installed on the side wall of the bed base 1. The output end of the servo drive motor 11 is connected to a precision ball screw 12. The precision ball screw 12 is threadedly engaged with the grinding wheel frame slide 3. Two sets of grinding units 4 are correspondingly arranged on the grinding wheel frame slide 3.

[0021] In this embodiment, the bed base 1 is the basic load-bearing component, and its bottom sides are detachably connected to guide load-bearing plates 13 by bolts, forming two high-precision sliding grooves. The sliding plates extending from both ends of the grinding wheel frame slide table 3 slide and engage within these grooves to ensure smooth movement.

[0022] Both the top-mounted device 16 and the power chuck 17 have workpiece clamping bases 2 at their bottoms. A connecting rod 5 is connected between the two ends of the grinding wheel frame slide 3 to form a rectangular mating hole, which slides with the workpiece clamping base 2.

[0023] A grinding unit 4 is mounted at one end of the grinding wheel head slide 3, and a fine-tuning slide 8 is slidably mounted at the other end. Another grinding unit 4 is mounted on the fine-tuning slide 8. A fine-tuning servo motor 6 is installed on the side wall of the grinding wheel head slide 3. The output end of the fine-tuning servo motor 6 is connected to a fine-tuning precision ball screw 7, which is threadedly engaged with the fine-tuning slide 8. The fine-tuning servo motor 6 drives the fine-tuning precision ball screw 7 to rotate, forcing the fine-tuning slide 8 to move one of the grinding units 4, thereby adjusting the relative position between the two grinding units 4. An angle adjustment motor 4010 is fixedly mounted on the top of both the grinding wheel head slide 3 and the fine-tuning slide 8. The output end of the angle adjustment motor 4010 is connected to an external gear 4011, which meshes with an external gear rotating frame 401.

[0024] The grinding unit 4 includes an external gear rotary frame 401, four servo electric cylinders 402, a main inner frame 403, and a secondary inner frame 404. The external gear rotary frame 401 is movably mounted on a grinding head mounting base 9. Four servo electric cylinders 402 are evenly fixedly mounted on the grinding head mounting base 9 along the circumference. The output end of each servo electric cylinder 402 is fixedly connected to a fixing ring 4012. The external gear rotary frame 401 and the fixing ring 4012 are rotatably engaged. The main inner frame 403 and the secondary inner frame 404 are fixedly mounted inside the external gear rotary frame 401. A pulley 405, a double-drive gear 406, and a grinding disc 407 are rotatably arranged between the inner frame 404 and the secondary inner frame 404. The pulley 405 and the double-drive gear 406 are driven by a drive belt 408. Driven gears are symmetrically installed on both sides of the grinding disc 407. Specifically, the grinding disc 407 is clamped between two flanges and axially clamped by bolts. The outer wall of the flanges integrates involute teeth as driven gears. A silicon nitride ceramic heat insulation gasket is added between the two flanges and the grinding disc 407 to block the conduction of frictional heat to the bearing assembly. The double-drive gear 406 meshes with the driven gears. A main drive motor 409 is installed on the outer wall of the inner frame 404, and the output end of the main drive motor 409 is connected to the pulley 405. The grinding disc 407 is a gear-shaped grinding disc, and the tooth profile of this gear-shaped grinding disc is conjugate to the helical surface of the worm gear to be processed, ensuring the synchronous grinding accuracy of multi-start threads.

[0025] In this embodiment, the double-drive gear 406 refers to two gears coaxially and fixedly connected. The main drive motor 409 and the angle adjustment motor 4010 are powered by independent power supplies, and can continue to operate by switching to emergency mode via PLC in case of single-point failure.

[0026] In this embodiment, the external gear rotary frame 401 has involute teeth on its surface, which match the external gear meshing gear 4011 at the output end of the angle adjustment motor 4010 to achieve dynamic angle adjustment within a range of ±15°. The servo electric cylinder 402 drives the grinding disc 407 to move radially through the fixed ring 4012. The main drive motor 409 drives the grinding disc 407 to rotate through the pulley 405 and the double transmission gear 406.

[0027] Coolant nozzles (not shown in the figure) are installed at both ends of the grinding wheel slide 3 corresponding to the grinding disc 407. The flow rate is adjustable from 5 to 50 L / min, forming a closed-loop cooling system in conjunction with the filter circuit in the bed base 1.

[0028] The servo electric cylinder 402 has integrated grooved heat dissipation fins on its outer wall, which increases the effective heat dissipation area by 40% compared with conventional designs, and keeps the temperature rise below 35°C during continuous operation.

[0029] The bed base 1 is provided with a cantilever bracket 14 at the end away from the servo drive motor 11. A hydraulic push rod 15 is installed on the cantilever bracket 14, and the output end of the hydraulic push rod 15 is connected to the workpiece clamping base 2.

[0030] The hydraulic push rod 15 on the cantilever bracket 14 applies a preload to the workpiece clamping base 2, counteracting the minor vibrations caused by the cutting force, thus increasing the stiffness by 1.8 times. The grinding device is equipped with a control cabinet to control each power unit.

[0031] The working process of this utility model: The screw to be ground is clamped and fixed by the power chuck 17 and the center device 16, and the hydraulic push rod 15 is activated to tighten the workpiece clamping base 2.

[0032] Servo drive motor 11 drives the grinding wheel slide 3 to move quickly to the starting position, main drive motor 409 activates the grinding disc 407 to rotate at high speed, and at the same time the coolant flushing is turned on.

[0033] The fine-tuning servo motor 6 precisely controls the relative position of the two grinding discs 407, while the angle adjustment motor 4010 dynamically corrects the grinding tilt angle.

[0034] After processing, the laser micrometer detects the worm gear tooth profile error online, and the data is fed back to the control system to complete closed-loop optimization.

[0035] Table 1. Performance Comparison between the Invention and Traditional Devices Cumulative pitch error (μm) ±8 ±35 77% increase Surface roughness Ra (μm) 0.6 1.2 Increase by 50% Processing time per piece (min) 8 15 47% reduction scrap rate (%) 1.2 8.5 Reduced by 86% The above results demonstrate that this invention has successfully overcome the existing technical bottlenecks through dual-sided collaborative grinding and multi-dimensional dynamic control, providing a reliable solution for the mass production of high-precision multi-start worm gears.

[0036] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A grinding device for a multi-start worm gear, comprising a bed base (1), a center device (16) mounted at one end of the bed base (1), and a power chuck (17) mounted at the other end, characterized in that: The grinding wheel frame slide (3) is slidably installed on the bed base (1). A servo drive motor (11) is installed on the side wall of the bed base (1). The output end of the servo drive motor (11) is connected to a precision ball screw (12). The precision ball screw (12) is threadedly engaged with the grinding wheel frame slide (3). Two sets of grinding units (4) are correspondingly arranged on the grinding wheel frame slide (3).

2. The grinding device for a multi-start worm gear according to claim 1, characterized in that: A grinding unit (4) is provided at one end of the grinding wheel slide (3), and a fine adjustment slide (8) is slidably provided at the other end. Another grinding unit (4) is provided on the fine adjustment slide (8). A fine adjustment servo motor (6) is installed on the side wall of the grinding wheel slide (3). A fine adjustment precision ball screw (7) is connected to the output end of the fine adjustment servo motor (6). The fine adjustment precision ball screw (7) is threadedly engaged with the fine adjustment slide (8).

3. The grinding device for a multi-start worm gear according to claim 2, characterized in that: The bottom of the top device (16) and the power chuck (17) are both provided with workpiece clamping bases (2), and the two ends of the grinding wheel frame slide (3) are connected by connecting rods (5) to form a rectangular mating hole, which slides with the workpiece clamping base (2).

4. The grinding device for a multi-start worm gear according to claim 2, characterized in that: The grinding unit (4) includes an external gear rotary frame (401), four servo electric cylinders (402), a main inner frame (403), and a secondary inner frame (404). The external gear rotary frame (401) is movably mounted on the grinding head mounting base (9). Four servo electric cylinders (402) are evenly fixedly mounted on the grinding head mounting base (9) along the circumference. The output end of the servo electric cylinders (402) is fixedly connected to a fixing ring (4012). The external gear rotary frame (401) and the fixing ring (4012) are rotatably engaged. The main inner frame (403) and the secondary inner frame (404) are fixedly mounted on the external gear rotary frame. Inside the frame (401), a pulley (405), a double-drive gear (406), and a grinding disc (407) are rotatably arranged between the main inner frame (403) and the secondary inner frame (404). The pulley (405) and the double-drive gear (406) are driven by a drive belt (408). Driven gears are symmetrically installed on both sides of the grinding disc (407). The double-drive gear (406) meshes with the driven gear. A main drive motor (409) is installed on the outer wall of the secondary inner frame (404). The output end of the main drive motor (409) is connected to the pulley (405).

5. The grinding device for a multi-start worm gear according to claim 4, characterized in that: The grinding disc (407) is a gear-shaped grinding disc.

6. The grinding device for a multi-start worm gear according to claim 2, characterized in that: An angle adjustment motor (4010) is fixedly installed on the top of both the grinding wheel frame slide (3) and the fine adjustment slide (8). The output end of the angle adjustment motor (4010) is connected to an external gear meshing gear (4011), which meshes with the external gear rotating frame (401).

7. The grinding device for a multi-start worm gear according to claim 1, characterized in that: The bottom sides of the bed base (1) are detachably connected to guide load plates (13) to form two sliding grooves. The bottom of the outer wall of the grinding wheel frame slide (3) extends outward to form a sliding plate, which slides in the sliding groove.

8. The grinding device for a multi-start worm gear according to claim 1, characterized in that: The bed base (1) is provided with a cantilever bracket (14) at one end away from the servo drive motor (11). A hydraulic push rod (15) is installed on the cantilever bracket (14), and the output end of the hydraulic push rod (15) is connected to the workpiece clamping base (2).

9. The grinding device for a multi-start worm gear according to claim 4, characterized in that: The outer wall of the servo electric cylinder is provided with grooved heat dissipation fins.

10. A grinding device for a multi-start worm gear according to claim 4, characterized in that: Coolant nozzles are provided at both ends of the grinding wheel slide (3) corresponding to the grinding disc (407).

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