A large gear ring hobbing self-centering tool and clamping method thereof

Abstract

The application discloses a large gear ring hobbing self-centering tool and a clamping method thereof, which comprises a machining table and multiple sets of positioning teeth, the multiple sets of positioning teeth are arranged around the outer circumferential side of the machining table, a gear ring is arranged above the machining table, a clamping assembly for supporting the gear ring is fixed to the top of the machining table, a supporting assembly is arranged at the bottom of the machining table, a lifting assembly is fixed to the top of the supporting assembly, and a gear opening assembly for cutting tooth grooves in the inner circumferences of the gear ring is fixed to the top of the lifting assembly; and a top ring is fixed to the top of the machining table. The application has the beneficial effects that two sets of clamps with adjustable spacing are arranged above the machining table, the two sets of clamps are driven to rotate in opposite directions by two sets of external threads with opposite screw directions at the two ends of a screw rod, the spacing of the two sets of clamps is adjusted quickly, the clamping of gear rings with different sizes is realized, the clamping and positioning requirements of gear rings with different outer diameters are improved, the use range is expanded, the positioning precision of the inner gear ring is improved, and the production efficiency is improved.

Description

Technical Field

[0001] This invention relates to the field of gear ring processing equipment, specifically to a self-centering tooling for large gear ring hobbing and its clamping method. Background Technology

[0002] Large gear rings are one of the main components of large equipment such as rotary kilns and ball mills. Gear hobbing is one of the important methods for producing gears. The processing method involves using a hob to rotate and cut the workpiece blank, thereby quickly generating gears. Gear hobbing can be used for spur gears, cycloidal gears, helical gears, and worm gears, but it is not suitable for internal gear rings. The processing of large internal gear rings usually uses gear shapers, which have low production efficiency. The processed workpieces are limited by the size of the gear shaper itself. For internal gear rings that cannot be processed on a gear shaper, most factories use scribing followed by milling on a machine tool. Although the milling method can complete the processing of internal gear rings, its productivity is low and the processing accuracy is low, which cannot meet the needs of industrial production of large batches of gear rings. Therefore, there is an urgent need to design a gear hobbing machine that can process large gear rings. Summary of the Invention

[0003] The purpose of this invention is to provide a self-centering tooling for large gear ring hobbing and its clamping method to solve the above-mentioned problems. By setting two sets of adjustable clamps above the machining table, the two sets of clamps are driven to rotate in opposite directions by two sets of external threads with opposite directions at both ends of the screw, thereby driving the two sets of clamps to achieve rapid adjustment of the spacing, so as to adapt to the clamping of gear rings of different sizes, improve the clamping and positioning requirements of gear rings with different outer diameters, expand the application range, improve the positioning accuracy of internal gear rings, and improve production efficiency, as detailed below.

[0004] To achieve the above objectives, the present invention provides the following technical solution:

[0005] The present invention provides a self-centering tooling for hobbing large gear rings, including a machining table and multiple sets of positioning teeth. The multiple sets of positioning teeth are arranged around the outer circumference of the machining table. A gear ring is provided above the machining table, and a clamping assembly supporting the gear ring is fixed on the top of the machining table. A support assembly is provided at the bottom of the machining table, and a lifting assembly is fixed on the top of the support assembly. A tooth-cutting assembly for cutting the inner circumference of the gear ring to generate tooth grooves is fixed on the top of the lifting assembly.

[0006] A top ring is fixed to the top of the processing table. Multiple sets of sliding grooves are vertically inserted through the top ring to accommodate the vertical sliding of positioning teeth into the tooth grooves. A fixing ring is provided on the outer circumference of the processing table below the top ring. A support rod is fixed to the bottom of the positioning teeth, which vertically passes through the fixing ring. The support rod and the fixing ring are fitted with a clearance. A spring is sleeved on the outside of the support rod below the positioning teeth to press down against the fixing ring.

[0007] Preferably, the bottom outer circumference of the processing table is provided with multiple sets of positioning plates corresponding to the positioning teeth. The outer side of the positioning plate is provided with a diamond-shaped groove, and the bottom of the diamond-shaped groove is provided with a limiting groove. The diamond-shaped groove includes two sets of vertically extending and parallel vertical grooves, and inclined grooves are provided on the upper and lower sides of the two sets of vertical grooves.

[0008] Preferably, the limiting groove is a herringbone-shaped groove, and the two ends of the bottom of the limiting groove are respectively connected to the vertical groove and the inclined groove. The bottom end of the support rod is fixed with a rotating seat, and the bottom of the rotating seat is hinged with a positioning rod. The bottom end of the positioning rod is a bent structure that extends longitudinally into the limiting groove.

[0009] Preferably, the clamping assembly includes two sets of rotating frames that are symmetrically fixed to the top of the processing table. A rectangular frame-shaped slide is fixed in the middle of the rotating frame. A rectangular strip slide is slidably fitted inside the slide. Clamps that are snapped onto the outer circumference of the toothed ring are fixed on opposite sides of the two sets of slides.

[0010] Preferably, a vertically extending drive plate is fixed to the top of the slide bar, and a screw is horizontally inserted through the top of the two sets of rotating seats. The screw and the rotating seat are rotatably engaged by bearings. Two sets of external threads with opposite directions are provided at both ends of the screw between the two sets of rotating seats, and the screw is threadedly engaged with the two sets of drive plates through the two sets of external threads. Two sets of knobs are fixed at both ends of the screw.

[0011] Preferably, the supporting component includes a base fixed to the bottom of the processing table, the processing table being a vertically extending cylindrical structure, and a rotating shaft coaxially extending into the processing table is fixed to the top of the base. The gear-opening component includes a timing disc sleeved on the outer circumference of the rotating shaft.

[0012] Preferably, a rotating cylinder with clearance fit to the rotating shaft is fixed on the top of the synchronous disc, a radial cylinder extending radially along the gear ring is fixed on the top of the rotating cylinder, a motor base is fixed on the telescopic end of the radial cylinder, two sets of rotating arms are symmetrically arranged on both sides of the front part of the motor base, and a hobbing gear is rotatably engaged in the middle of the two sets of rotating arms, an electric motor is arranged on the outside of the motor base, and a transmission rod extending to the outside of the hobbing gear is connected to the output end of the electric motor, and a bevel gear mechanism for driving the hobbing gear to rotate is arranged on the outside of the transmission rod.

[0013] Preferably, the lifting assembly includes a rotating ring rotatably sleeved on the outside of the synchronous disc, an axial cylinder is provided at the bottom of the rotating ring, the axial cylinder is fixed to the top side of the base, and multiple sets of rotating grooves are arranged around the inner circumference of the processing table. Each rotating groove corresponds to a positioning tooth. Each rotating groove includes a vertically extending guide groove, the bottom of which is connected to a shifting groove with an outwardly inclined top. The multiple sets of rotating grooves are connected end to end to each other.

[0014] Preferably, multiple sets of spokes are fixed around the outer circumference of the top of the synchronization disk. The top of each spoke is inclined outward and extends into the rotating groove. The spokes are in clearance fit with the rotating groove. A magnetic strip is provided on the inclined surface of the bottom of the transposition groove to attract the spokes into the transposition groove. A set of vertical grooves connected to the outside of the limiting groove is provided with a magnetic block that magnetically connects to the positioning rod.

[0015] The clamping method of the large gear ring hobbing self-centering tool includes the following steps:

[0016] a. When it is necessary to cut the toothed ring as a blank to form an internal gear, place the toothed ring between the two sets of clamps of the clamping assembly. By pressing down the toothed ring on multiple sets of positioning teeth, the positioning rod connected to the bottom of the support rod of the multiple sets of positioning teeth is moved down to the position where it is inserted into the limiting groove. At this time, the positioning rod is used to engage the limiting groove to lock the positioning teeth. At the same time, the spring is kept in a compressed state. Then, turn the knob to drive the screw to rotate. The two sets of external threads with opposite directions on the screw drive the two sets of drive plate support slides to slide in the opposite direction. Then, the two sets of slides support the two sets of clamps to move closer to each other. The two sets of clamps are used to press and fix the toothed ring to the coaxial position above the processing table, thus completing the toothed ring clamping process.

[0017] b. Then, the axial cylinder drives the entire gear-opening assembly to move downwards, while the radial cylinder drives the motor base and the hobbing gear to extend outwards. At the same time, the motor drives the hobbing gear to rotate using the transmission rod. As the gear-opening assembly extends outwards and moves downwards, the continuously rotating hobbing gear cuts a tooth groove into the inner circumference of the gear ring. As the entire gear-opening assembly moves downwards, the bottom of the motor base moves down to press against a set of positioning teeth at the corresponding position, thereby applying pressure to the set of positioning teeth to continue moving downwards. The set of positioning teeth drives the support rod and positioning rod to continue moving downwards. The elbow at the bottom of the positioning rod disengages from the limiting groove, and the downward locking state of the set of positioning teeth is released.

[0018] c. Simultaneously, the synchronous disc of the gear-cutting assembly drives multiple sets of spokes to move down to the bend position at the bottom of the rotating groove. At this time, the gear-cutting assembly moves down to the lowest position, and a set of tooth grooves on the gear ring is cut and machined. Then, the axial cylinder drives the gear-cutting assembly to move up, while the radial cylinder contracts, causing the hobbing gear to disengage from the tooth groove and the motor base to disengage from the positioning tooth. At this time, the downward pressure on the positioning tooth disappears, and the bend at the end of the lower positioning rod also disengages from the limiting groove. Under the action of the compressed spring, the positioning rod moves up along the other side of the vertical groove to the top corner of the diamond groove, thereby automatically pushing the set of positioning teeth into the cut tooth groove, realizing the positioning of the tooth groove at this position.

[0019] d. During the upward repositioning process of the tooth-cutting assembly, the outer end of the spoke moves into the tilted repositioning groove under the attraction of the magnetic strip. Then, the repositioning groove guides the spoke to rotate the entire tooth-cutting assembly to the top position of another set of guide grooves. This allows the entire tooth-cutting assembly to automatically rotate to the next grooving position after a set of tooth grooves is cut. Thus, during the grooving of adjacent tooth grooves, the tooth-cutting assembly can be automatically rotated and positioned.

[0020] The beneficial effects are as follows: This invention sets two sets of adjustable clamps above the processing table, and drives the two sets of clamps to rotate in opposite directions through two sets of external threads at both ends of the screw, thereby driving the two sets of clamps to achieve rapid adjustment of the spacing, so as to adapt to the clamping of toothed rings of different sizes, improve the clamping and positioning requirements of toothed rings of different outer diameters, and expand the scope of application.

[0021] In addition, multiple sets of positioning teeth are set below the toothed ring so that they can rise up and engage with the cut tooth grooves. This allows multiple sets of positioning teeth to be raised sequentially to position the toothed ring during the rolling cut process, thereby improving the stability of the toothed ring machining process and enhancing the positioning accuracy of the internal toothed ring.

[0022] A rotating groove is set inside the processing table to guide the tooth-cutting assembly to rotate periodically during the lifting and lowering process. This allows the tooth-cutting assembly to rotate periodically in accordance with the tooth-cutting speed. During each lifting and lowering action of the tooth-cutting assembly, an automatic rotation of one tooth groove angle is achieved, eliminating the need for a separate rotation adjustment mechanism. This further improves the tooth-cutting accuracy and increases production efficiency. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a front view structural diagram of the present invention;

[0025] Figure 2 This is a three-dimensional structural schematic diagram of the present invention;

[0026] Figure 3 This is a partial structural breakdown diagram of the present invention;

[0027] Figure 4 This is a schematic diagram showing the overall structure of the present invention broken down;

[0028] Figure 5 This is a three-dimensional structural diagram of the processing table of the present invention;

[0029] Figure 6This is a three-dimensional structural schematic diagram of the positioning teeth of the present invention;

[0030] Figure 7 This is a three-dimensional structural schematic diagram of the clamping assembly of the present invention;

[0031] Figure 8 This is a three-dimensional structural schematic diagram of the toothed component of the present invention;

[0032] Figure 9 This is a top view of the structure of the present invention.

[0033] The annotations in the attached figures are explained as follows:

[0034] 1. Machining table; 101. Top ring; 101a. Slide groove; 102. Fixing ring; 103. Positioning plate; 104. Diamond groove; 104a. Vertical groove; 104b. Inclined groove; 105. Limiting groove; 106. Rotating groove; 106a. Guide groove; 106b. Repositioning groove; 2. Positioning teeth; 201. Support rod; 202. Spring; 203. Rotating seat; 204. Positioning rod; 3. Clamping assembly; 301. Screw; 301a. External thread; 302. Rotating frame; 303. Slide frame; 304. 1. Sliding bar; 304a. Drive plate; 305. Clamp; 306. Knob; 4. Gear ring; 401. Gear groove; 5. Support assembly; 501. Base; 502. Rotating shaft; 6. Gear assembly; 601. Synchronous disc; 601a. ​​Spoke; 602. Rotating cylinder; 603. Radial cylinder; 604. Motor base; 605. Rotating arm; 606. Gear hobbing; 607. Bevel gear mechanism; 608. Transmission rod; 609. Electric motor; 7. Lifting assembly; 701. Rotating ring; 702. Axial cylinder. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be described in detail below. Obviously, the described embodiments are merely some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other implementation methods obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0036] See Figures 1-9 As shown, the present invention provides a self-centering tooling for hobbing large gear rings, including a machining table 1 and multiple sets of positioning teeth 2. The multiple sets of positioning teeth 2 are arranged around the outer circumference of the machining table 1. A gear ring 4, which serves as a gear machining blank, is arranged above the machining table 1. A clamping assembly 3 that supports the gear ring 4 is fixed on the top of the machining table 1. A support assembly 5 is arranged at the bottom of the machining table 1. A lifting assembly 7 is fixed on the top of the support assembly 5. A tooth-cutting assembly 6 that cuts the inner circumference of the gear ring 4 to generate a tooth groove 401 is fixed on the top of the lifting assembly 7. The tooth-cutting assembly 6 is moved up and down by the lifting assembly 7 to perform the tooth-cutting action.

[0037] A top ring 101 is fixed on the top of the processing table 1. Multiple sets of sliding grooves 101a are vertically inserted through the top ring 101 to accommodate the positioning teeth 2 sliding vertically into the tooth grooves 401. A fixing ring 102 is provided on the outer circumference of the processing table 1 below the top ring 101. A support rod 201 is fixed at the bottom of the positioning teeth 2, which vertically penetrates the fixing ring 102. The support rod 201 and the fixing ring 102 are in clearance fit. A spring 202 is sleeved on the outside of the support rod 201 below the positioning teeth 2 to press down against the fixing ring 102. The spring 202 is used to maintain the upward pressing force against the positioning teeth 2.

[0038] As an optional implementation, the bottom outer circumference of the processing table 1 is provided with multiple sets of positioning plates 103 corresponding to the positioning teeth 2. The outer side of the positioning plates 103 is provided with a diamond-shaped groove 104. The bottom of the diamond-shaped groove 104 is provided with a limiting groove 105. The diamond-shaped groove 104 includes two sets of vertically extending and parallel vertical grooves 104a. The upper and lower sides of the two sets of vertical grooves 104a are provided with inclined grooves 104b. The limiting groove 105 is a "V"-shaped groove. The bottom two ends of the limiting groove 105 are respectively connected to the vertical grooves 104a and the inclined grooves 104b. The bottom end of the support rod 201 is fixed with a rotating seat 203. The bottom of the rotating seat 203 is hinged with a positioning rod 204. The bottom end of the positioning rod 204 is a bent structure that extends longitudinally into the limiting groove 105. Specifically, the bent head is clamped into the limiting groove 105, thereby locking the positioning teeth 2 to a position away from the tooth ring 4.

[0039] The clamping assembly 3 includes two sets of rotating frames 302 that are symmetrically fixed to the top of the processing table 1. A rectangular frame-shaped slide frame 303 extending laterally is fixed in the middle of the rotating frame 302. A rectangular strip-shaped slide bar 304 is slidably fitted inside the slide frame 303. Clamps 305 that engage with the outer circumference of the gear ring 4 are fixed on opposite sides of the two sets of slide bars 304. The clamps 305 are C-shaped frame structures that clamp the outer circumference of the gear ring 4. A vertically extending drive plate 304a is fixed to the top of the slide bar 304. A screw 301 extends laterally through the top of the two sets of rotating seats 203. The screw 301 and the rotating seat 203 are connected by a thrust shaft. The screw 301 between the two sets of rotating seats 203 is provided with two sets of external threads 301a with opposite directions at both ends. The screw 301 is threadedly engaged with the two sets of drive plates 304a through the two sets of external threads 301a. Two sets of knobs 306 are fixed at both ends of the screw 301. When it is necessary to adjust the distance between the two sets of clamps 305, rotating the knobs 306 will drive the screw 301 to rotate. The two sets of external threads 301a with opposite directions at both ends of the screw 301 will support the two sets of drive plates 304a to drive the slide bar 304 to slide under the support of the slide frame 303, thereby realizing the position adjustment action of the two sets of clamps 305.

[0040] The support assembly 5 includes a base 501 fixed to the bottom of the processing table 1, the processing table 1 being a vertically extending cylindrical structure, and a rotating shaft 502 coaxially extending into the processing table 1 fixed to the top of the base 501. The gear-cutting assembly 6 includes a timing disc 601 sleeved on the outer circumference of the rotating shaft 502, the timing disc 601 being clearance-fitted with the rotating shaft 502 to ensure that the timing disc 601 can rotate freely outside the rotating shaft 502. A rotating cylinder 602 clearance-fitted with the rotating shaft 502 is fixed to the top of the timing disc 601, and a radial cylinder 603 extending radially along the gear ring 4 is fixed to the top of the rotating cylinder 602. 03 A motor base 604 is fixed at the telescopic end. Two sets of rotating arms 605 are symmetrically arranged on both sides of the front part of the motor base 604, and a hobbing gear 606 is rotatably engaged in the middle of the two sets of rotating arms 605. A motor 609 is arranged on the outside of the motor base 604. The output end of the motor 609 is connected to a transmission rod 608 extending to the outside of the hobbing gear 606. A bevel gear mechanism 607 for driving the hobbing gear 606 to rotate is arranged on the outside of the transmission rod 608. The motor base 604 can be driven to move radially by the radial cylinder 603 so that the hobbing gear 606 can be pressed against the inner circumferential wall of the gear ring 4 for cutting.

[0041] The lifting assembly 7 includes a rotating ring 701 that is rotatably sleeved on the outside of the synchronous disc 601 via a bearing. An axial cylinder 702 is provided at the bottom of the rotating ring 701 to support the rotating ring 701 and drive the entire gear assembly 6 to move up and down. The axial cylinder 702 is fixed to the top side of the base 501.

[0042] In addition, multiple sets of rotating grooves 106 are arranged around the inner circumference of the processing table 1. Each rotating groove 106 corresponds to a positioning tooth 2. The rotating groove 106 includes a vertically extending guide groove 106a. The bottom of the guide groove 106a is connected to a shifting groove 106b with an outwardly inclined top. The multiple sets of rotating grooves 106 are connected end to end to each other. Multiple sets of spokes 601a are fixed around the outer circumference of the top of the synchronous disk 601. The top of the spokes 601a is inclined outward and extends into the rotating groove 106. The spokes 601a and the rotating groove 106 are in clearance fit. When the spokes 601a extend into the guide groove 106a, the tooth-opening assembly 6 moves downward and the hobbing 606 rotates to perform the tooth-opening action, ensuring the smoothness of the downward movement of the tooth-opening assembly 6 and ensuring the quality of the workpiece. When the spokes 601a move upward with the synchronous disk 601, the spokes 601a... 01a is moved into the shifting groove 106b. The shifting groove 106b, which is in an inclined state, supports the entire tooth-opening assembly 6 to rotate to the next set of tooth grooves 401, realizing the rotational shifting action of the entire tooth-opening assembly 6. The bottom inclined surface of the shifting groove 106b is provided with a magnetic strip to attract the spoke 601a into the shifting groove 106b, ensuring that the spoke 601a can be smoothly moved into the shifting groove 106b for guidance and shifting during the lifting process. The inner wall of a set of vertical grooves 104a connected to the outside of the limiting groove 105 is provided with a magnetic block to magnetically connect the positioning rod 204, ensuring that the positioning rod 204 can be moved into the lower set of vertical grooves 104a during the upward movement, and ensuring that the positioning plate 103 can adjust and lock the positioning rod 204 and the positioning tooth 2 by using the diamond groove 104 in conjunction with the limiting groove 105.

[0043] The clamping method for the 606 self-centering tooling for large gear hobbing includes the following steps:

[0044] a. When it is necessary to cut the toothed ring 4, which is used as a blank, into a toothed groove 401 to form an internal gear, the toothed ring 4 is placed between the two sets of clamps 305 of the clamping assembly 3. The toothed ring 4 presses down on the multiple sets of positioning teeth 2, thereby moving the positioning rod 204 connected to the bottom end of the bottom support rod 201 of the multiple sets of positioning teeth 2 down to the position of being inserted into the limiting groove 105. At this time, the positioning rod 204 is used to engage the limiting groove 105 to lock the positioning teeth 2. At the same time, the spring 202 is kept in a compressed state. Then, the knob 306 is turned to drive the screw 301 to rotate. The two sets of external threads 301a with opposite directions on the screw 301 drive the two sets of drive plates 304a to support the slide bar 304 to slide in the opposite direction. Then, the two sets of slide bars 304 support the two sets of clamps 305 to move closer to each other, so that the two sets of clamps 305 can be used to press and fix the toothed ring 4 to the coaxial position above the processing table 1, thus completing the clamping process of the toothed ring 4.

[0045] b. Then, the axial cylinder 702 drives the gear-opening assembly 6 to move downward as a whole, while the radial cylinder 603 drives the motor base 604 and the hobbing gear 606 to extend outward. At the same time, the motor 609 drives the hobbing gear 606 to rotate through the transmission rod 608. As the gear-opening assembly 6 extends outward and moves downward, the continuously rotating hobbing gear 606 cuts a tooth groove 401 into the inner circumference of the tooth ring 4. As the gear-opening assembly 6 moves downward as a whole, the bottom of the motor base 604 moves down to press against a set of positioning teeth 2 at the corresponding position, thereby applying pressure to the set of positioning teeth 2 to continue moving downward. The set of positioning teeth 2 drives the support rod 201 and the positioning rod 204 to continue moving downward. The bottom bend of the positioning rod 204 disengages from the limiting groove 105, and the downward locking state of the set of positioning teeth 2 is released.

[0046] c. Simultaneously, the synchronous disc 601 of the gear-opening assembly 6 drives multiple sets of spokes 601a to move down to the bend position at the bottom of the rotating groove 106. At this time, the gear-opening assembly 6 moves down to the lowest position, and a set of tooth grooves 401 on the gear ring 4 is cut and processed. Then, the axial cylinder 702 drives the gear-opening assembly 6 to move up, while the radial cylinder 603 contracts, causing the hobbing 606 to disengage from the tooth groove 401 and the motor base 604 to disengage from the positioning tooth 2. At this time, the downward pressure on the positioning tooth 2 disappears, and the bend at the end of the lower positioning rod 204 also comes out of the limiting groove 105. Under the action of the compressed spring 202, the positioning rod 204 moves up along the other side of the vertical groove 104a to the top corner position of the diamond groove 104, thereby automatically pushing the set of positioning teeth 2 into the cut tooth groove 401, realizing the positioning of the tooth groove 401 at this position.

[0047] d. During the upward repositioning process of the tooth-cutting assembly 6, the outer end of the spoke 601a moves into the inclined transposition groove 106b under the attraction of the magnetic strip. Then, the transposition groove 106b guides the spoke 601a to rotate the entire tooth-cutting assembly 6 to the top position of another set of guide grooves 106a. This enables the entire tooth-cutting assembly 6 to automatically rotate to the next grooving position after a set of tooth grooves 401 are cut and generated. Thus, during the grooving process of adjacent tooth grooves 401, the tooth-cutting assembly 6 can be automatically rotated and positioned.

[0048] By setting two sets of adjustable clamps 305 above the processing table 1, the two sets of clamps 305 are driven to rotate in opposite directions by two sets of external threads 301a at both ends of the screw 301, thereby driving the two sets of clamps 305 to achieve rapid adjustment of the spacing, so as to adapt to the clamping of gear rings of different sizes, improve the clamping and positioning requirements of gear rings 4 with different outer diameters, and expand the application range.

[0049] In addition, multiple sets of positioning teeth 2 are provided below the toothed ring 4, which can rise up and engage with the cut tooth groove 401. When the tooth groove 401 is generated by rolling cutting in sequence, multiple sets of positioning teeth 2 can be raised in sequence to position the toothed ring 4, thereby improving the stability of the toothed ring 4 machining process and improving the positioning accuracy of the internal toothed ring.

[0050] A rotating groove 106 is set inside the processing table 1 to guide the tooth-opening assembly 6 to rotate periodically during the lifting and lowering process. This allows the tooth-opening assembly 6 to rotate periodically in accordance with the tooth-opening speed. During each lifting and lowering tooth-opening action of the tooth-opening assembly 6, an automatic rotation of one tooth groove angle 401 is achieved, thus eliminating the need for a separate rotation adjustment mechanism, further improving tooth-opening accuracy and production efficiency.

[0051] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A self-centering tooling for hobbing large gear rings, characterized in that: It includes a processing table (1) and multiple groups of positioning teeth (2). The multiple groups of positioning teeth (2) are arranged around the outer circumferential side of the processing table (1). Above the processing table (1), there is a toothed ring (4), and a clamping component (3) for supporting the toothed ring (4) is fixed to the top of the processing table (1). At the bottom of the processing table (1), there is a supporting component (5). The top of the supporting component (5) is fixed with a lifting component (7), and the top of the lifting component (7) is fixed with a tooth-opening component (6) for cutting a tooth groove (401) on the inner circumference of the toothed ring (4); On the top of the processing table (1), a top ring (101) is fixed. Multiple groups of chutes (101a) through which the positioning teeth (2) vertically slide into the tooth groove (401) are vertically penetrated through the top ring (101). On the outer circumferential side of the processing table (1) below the top ring (101), a fixed ring (102) is provided. At the bottom of the positioning tooth (2), a support rod (201) vertically penetrating the fixed ring (102) is fixed, and the support rod (201) is in clearance fit with the fixed ring (102). Outside the support rod (201) below the positioning tooth (2), a spring (202) pressing down against the fixed ring (102) is sleeved; On the outer circumferential side of the bottom of the processing table (1), multiple groups of positioning plates (103) are provided corresponding to the positioning teeth (2). On the outside of the positioning plates (103), a diamond-shaped groove (104) is provided. At the bottom of the diamond-shaped groove (104), a limiting groove (105) is provided. The diamond-shaped groove (104) includes two vertically extending and parallel vertical grooves (104a), and inclined grooves (104b) extending obliquely are provided on both the upper and lower sides of the two vertical grooves (104a); The limiting groove (105) is a "person"-shaped groove, and both ends of the bottom of the limiting groove (105) are respectively communicated with the vertical groove (104a) and the inclined groove (104b). At the bottom end of the support rod (201), a rotating seat (203) is fixed. At the bottom of the rotating seat (203), a positioning rod (204) is hinged. The bottom end of the positioning rod (204) is an elbow structure longitudinally extending into the limiting groove (105); 2. The self-centering tooling for hobbing large gear rings according to claim 1, characterized in that: The clamping component (3) includes two rotating frames (302) symmetrically fixed horizontally on the top of the processing table (1). In the middle of the rotating frame (302), a horizontally extending rectangular frame-shaped sliding frame (303) is fixed. Inside the sliding frame (303), a rectangular strip-shaped sliding bar (304) is slidably fitted. On the opposite sides of the two sliding bars (304), clamps (305) clamped to the outer circumferential side of the toothed ring (4) are fixed.

3. The self-centering tooling for hobbing large gear rings according to claim 2, characterized in that: The top of the slide bar (304) is fixed with a vertically extending drive plate (304a). The tops of the two sets of rotating frames (302) are transversely connected with screws (301). The screws (301) and the rotating frames (302) are rotatably engaged by bearings. The two ends of the screws (301) between the two sets of rotating frames (302) are provided with two sets of external threads (301a) with opposite directions. The screws (301) are threadedly engaged with the two sets of drive plates (304a) through the two sets of external threads (301a). The two ends of the screws (301) are fixed with two sets of knobs (306).

4. The self-centering tooling for hobbing large gear rings according to claim 3, characterized in that: The supporting component (5) includes a base (501) fixed to the bottom of the processing table (1), the processing table (1) is a vertically extending cylindrical structure, and a rotating shaft (502) coaxially extending into the processing table (1) is fixed to the top of the base (501). The gear-opening component (6) includes a timing disc (601) sleeved on the outer circumference of the rotating shaft (502).

5. The self-centering tooling for hobbing large gear rings according to claim 4, characterized in that: The top of the synchronous disk (601) is fixed with a rotating cylinder (602) that is clearance-fitted to the rotating shaft (502). The top of the rotating cylinder (602) is fixed with a radial cylinder (603) that extends radially along the gear ring (4). The telescopic end of the radial cylinder (603) is fixed with a motor base (604). Two sets of rotating arms (605) are symmetrically arranged on both sides of the front part of the motor base (604), and a hob (606) is rotatably engaged in the middle of the two sets of rotating arms (605). A motor (609) is arranged on the outside of the motor base (604). The output end of the motor (609) is connected to a transmission rod (608) that extends to the outside of the hob (606). A bevel gear mechanism (607) that drives the hob (606) to rotate is arranged on the outside of the transmission rod (608).

6. The self-centering tooling for hobbing large gear rings according to claim 5, characterized in that: The lifting assembly (7) includes a rotating ring (701) rotatably sleeved on the outside of the synchronous disc (601). An axial cylinder (702) is provided at the bottom of the rotating ring (701). The axial cylinder (702) is fixed to the top side of the base (501). Multiple sets of rotating grooves (106) are arranged around the inner circumference of the processing table (1). The rotating grooves (106) correspond one-to-one with the positioning teeth (2). The rotating grooves (106) include vertically extending guide grooves (106a). The bottom of the guide grooves (106a) is connected to a top-inclined shifting groove (106b). The multiple sets of rotating grooves (106) are connected end to end to each other.

7. The self-centering tooling for hobbing large gear rings according to claim 6, characterized in that: Multiple spokes (601a) are fixed around the outer circumference of the top of the synchronization disk (601). The top of the spokes (601a) is inclined outward and extends into the rotating groove (106). The spokes (601a) and the rotating groove (106) are in clearance fit. The bottom inclined surface of the inner side of the shifting groove (106b) is provided with a magnetic strip that attracts the spokes (601a) to move into the shifting groove (106b). The inner wall of a set of vertical grooves (104a) connected to the outer side of the limiting groove (105) is provided with a magnetic block that magnetically connects to the positioning rod (204).

8. The clamping method of the self-centering tooling for large gear hobbing according to claim 7, characterized in that, Includes the following steps: a. When it is necessary to cut the toothed ring (4) as blank to form an internal gear by cutting the toothed groove (401), place the toothed ring (4) between the two sets of clamps (305) of the clamping assembly (3), and press down the multiple sets of positioning teeth (2) by the toothed ring (4), thereby moving the positioning rod (204) connected to the bottom end of the bottom support rod (201) of the multiple sets of positioning teeth (2) down to the position of being inserted into the limiting groove (105). At this time, the positioning rod (204) is used to engage the limiting groove (105) to lock the positioning teeth (2), and at the same time springs up. The spring (202) is kept in a compressed state. Then, the knob (306) is turned to drive the screw (301) to rotate. The two sets of external threads (301a) with opposite directions on the screw (301) drive the two sets of drive plates (304a) to support the slide bar (304) to slide in the opposite direction. Then, the two sets of slide bars (304) support the two sets of clamps (305) to move closer to each other. The two sets of clamps (305) are used to press and fix the toothed ring (4) to the coaxial position above the processing table (1), thus completing the clamping process of the toothed ring (4). b. Then, the axial cylinder (702) drives the gear-opening assembly (6) to move downward as a whole, and the radial cylinder (603) drives the motor base (604) and the hobbing gear (606) to extend outward. At the same time, the motor (609) drives the hobbing gear (606) to rotate using the transmission rod (608). While the gear-opening assembly (6) extends outward and moves downward, the continuously rotating hobbing gear (606) cuts a tooth groove (401) into the inner circumference of the gear ring (4). While the gear-opening assembly (6) moves downward as a whole, the bottom of the motor base (604) moves down to press against a set of positioning teeth (2) at the corresponding position, thereby applying pressure to the set of positioning teeth (2) to continue moving downward. The set of positioning teeth (2) drives the support rod (201) and the positioning rod (204) to continue moving downward. The bottom bend of the positioning rod (204) disengages from the limiting groove (105), and the downward locking state of the set of positioning teeth (2) is released. c. Simultaneously, the synchronous disc (601) of the gear-cutting assembly (6) drives multiple sets of spokes (601a) to move down to the bend position at the bottom of the rotating groove (106). At this time, the gear-cutting assembly (6) moves down to the lowest position, and a set of tooth grooves (401) on the gear ring (4) is cut and machined. Then, the axial cylinder (702) drives the gear-cutting assembly (6) to move up, while the radial cylinder (603) retracts, causing the hobbing gear (606) to disengage from the tooth groove (401). The motor base (60) 4) Disengage from the positioning teeth (2). At this time, the downward pressure on the positioning teeth (2) disappears, and the elbow at the end of the lower positioning rod (204) also comes out from the limiting groove (105). Under the action of the compressed spring (202), the positioning rod (204) moves up along the other side vertical groove (104a) to the top corner of the diamond groove (104), thereby automatically pushing the set of positioning teeth (2) into the tooth groove (401) that is cut out, so as to realize the positioning of the tooth groove (401) at this position. d. During the upward repositioning process of the tooth-cutting assembly (6), the outer end of the spoke (601a) moves into the inclined transposition groove (106b) under the attraction of the magnetic strip. Then, the transposition groove (106b) guides the spoke (601a) to rotate the tooth-cutting assembly (6) to the top position of another set of guide grooves (106a). This enables the tooth-cutting assembly (6) to automatically rotate to the next grooving position after a set of tooth grooves (401) are cut and generated. Thus, when grooving adjacent tooth grooves (401) are processed, the tooth-cutting assembly (6) can be automatically rotated and positioned.

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