Finishing mechanism and finishing method for grinding wheel of centerless external thread grinding machine

Abstract

The invention relates to a dressing mechanism for a grinding wheel of a centerless external thread grinding machine. The grinding roller is arranged corresponding to a grinding wheel and is driven by a driving device to rotate around the axis; the vertical feeding mechanism drives the grinding roller to move back and forth relative to the grinding wheel; the horizontal feeding mechanism drives the grinding roller to move in a left-right adjusting mode, the swing mechanism drives the grinding roller to rotate so that the axis of the grinding roller and the axis of the grinding wheel can form a corresponding included angle, and the swing mechanism drives the grinding roller to rotate to adjust the grinding angle of the grinding roller so that grinding wheels with different machining requirements can be dressed. And meanwhile, the vertical feeding mechanism and the horizontal feeding mechanism are arranged to drive the grinding roller to move, so that the grinding roller can finish and process the grinding wheel at one time.

Description

TECHNICAL FIELD

[0001] The application relates to the field of grinding wheel dressing, in particular to a dressing mechanism for a centerless outer thread grinding machine grinding wheel. BACKGROUND

[0002] At present, high-precision grinding of outer threads mainly adopts two technical schemes. The first scheme is a thread grinding machine based on the principle of center thread grinding, and the second scheme is a thread grinding machine based on the principle of traditional centerless grinding. However, the two schemes are all realized by a grinding wheel to grind the outer thread of a screw rod. During the grinding process of the outer thread of the screw rod, the grinding surface of the grinding wheel will be worn, such as pits, which will affect the processing effect. In general, a new grinding wheel sheet needs to be replaced. However, frequent replacement of the grinding wheel sheet will increase the production cost. The original grinding wheel sheet can still be used after dressing and grinding, and the worn grinding wheel also needs to be dressed and ground by using a grinding wheel grinding machine.

[0003] A screw nut inner thread grinding machine with patent application No. CN202510911201.5 comprises a bed body, a fixed workbench arranged on the front side of the bed body, a headstock fixedly installed on the left side of the workbench, a movable center frame arranged on the right side of the workbench, a chuck for clamping a workpiece installed at one end of the headstock, a movable double-coordinate workbench arranged on the rear side of the bed body, a movable grinding wheel frame installed on one side of the double-coordinate workbench, a grinding wheel dresser installed on the other side of the double-coordinate workbench, a telescopic and rotatable grinding wheel grinding device installed at the front end of the grinding wheel frame, and a grinding wheel transmission device connected to the grinding wheel grinding device. Although the grinding wheel dresser is arranged in the above-mentioned application, the corresponding grinding wheel dresser cannot realize dressing of grinding wheels with different helix angles, and the corresponding structure is simple and cannot realize one-time dressing and grinding of the grinding wheel of the centerless outer thread grinding machine. Moreover, the wide grinding wheel after dressing cannot effectively solve the problem of tool deflection caused by system elastic deformation during the grinding process. SUMMARY

[0004] The present application solves the problems existing in the prior art, and provides a dressing mechanism for a centerless outer thread grinding machine grinding wheel, which can realize dressing of grinding wheels with different angles to meet the processing requirements of screw rods with different helix angles, and can realize one-time dressing and grinding of the grinding wheel. Moreover, the wide grinding wheel after dressing can effectively solve the problem of tool deflection caused by system elastic deformation during the grinding process.

[0005] The application solves the technical problems by adopting the technical scheme: the adjustable angle dressing mechanism for the centerless outer thread grinding machine comprises a grinding roller rotating around an axis driven by a driving device corresponding to a grinding wheel, a vertical feeding mechanism driving the grinding roller to move forward and backward relative to the grinding wheel, a horizontal feeding mechanism driving the grinding roller to move left and right, and a rotating mechanism driving the grinding roller to rotate so that the axis of the grinding roller and the axis of the grinding wheel form a certain angle, the grinding roller is rotated by the rotating mechanism to adjust the grinding angle of the grinding roller, the grinding wheel with different processing requirements is dressed, and the vertical feeding mechanism and the horizontal feeding mechanism are arranged to drive the grinding roller to move, so that the grinding roller can dress and process the grinding wheel at one time.

[0006] Preferably, the driving device comprises a base, a driving motor mounted on the base, a rotating shaft connected to the output end of the driving motor and rotatingly connected to the base, and a transmission mechanism in transmission connection with the rotating shaft for driving the grinding roller to rotate.

[0007] Preferably, the rotating mechanism comprises an adjusting sleeve rotatingly connected in the base and rotatingly mounted outside the rotating shaft, a roller mounting seat mounted on the adjusting sleeve and used for mounting the grinding roller, and a rotating mechanism for driving the rotating adjusting sleeve to rotate, the rotating mechanism drives the adjusting sleeve to rotate and adjusts the axis of the grinding roller so as to correspond to the axis of the grinding wheel, the adjusting sleeve is arranged outside the rotating shaft, the structure of the rotating mechanism is more compact, the grinding roller can rotate at different angles, and the rotation of the grinding roller can be realized.

[0008] Preferably, the rotating mechanism comprises a worm wheel mounted outside the adjusting sleeve for driving the adjusting sleeve to rotate, and a driving worm rotatingly connected to the base and in transmission connection with the worm wheel for driving the worm wheel to rotate, the driving worm can be driven to rotate by a driving member, the rotation of the adjusting sleeve is driven by the worm wheel and the worm, the angle adjustment of the adjusting sleeve is convenient, the angle of the adjusting sleeve can be locked by the worm wheel and the worm, and the angle of the adjusting sleeve is prevented from deviating when the grinding wheel is dressed and processed.

[0009] Preferably, the rotating mechanism comprises a driving rod fixed outside the adjusting sleeve and extending outward, a pushing part sleeved outside the driving rod, and a follower rod connected with the pushing part and mounted on the grinding wheel, when the axis of the grinding wheel is adjusted by rotating the grinding wheel, the driving rod is driven to rotate the adjusting sleeve by the follower rod and the pushing part, and then the grinding roller is correspondingly adjusted to rotate synchronously with the grinding wheel.

[0010] Preferably, the roller mounting seat is provided with a mounting groove for mounting the grinding roller on the side away from the adjusting sleeve, a driving shaft is mounted in the grinding roller and rotationally connected in the roller mounting seat to drive the grinding roller to rotate, the adjusting sleeve is coaxially arranged on the rotating shaft, the transmission mechanism comprises a first bevel gear mounted on the rotating shaft and located in the roller mounting seat, a second bevel gear arranged in the roller mounting seat and in transmission connection with the first bevel gear, a transmission shaft rotationally mounted in the roller mounting seat and driven to rotate by the second bevel gear, a first belt pulley mounted on the transmission shaft and driven to rotate by the transmission shaft, a second belt pulley arranged on the outside of the driving shaft to drive the driving shaft to rotate, and a belt in transmission connection on the outside of the first belt pulley and the second belt pulley. During installation, the mounting position of the grinding roller is arranged on the same axis as the adjusting sleeve and the rotating shaft, so that the corresponding force can be directly transmitted to the base through the roller mounting seat during the trimming process, thereby avoiding the bending of the adjusting sleeve and the rotating shaft under stress. At the same time, the above-mentioned transmission mechanism can make the roller mounting seat not only realize the adjustment rotation with the adjusting sleeve, but also realize the force transmission of the rotating shaft.

[0011] Preferably, the roller mounting seat comprises a fixed part mounted on the adjusting sleeve, a fixed end arranged on the fixed part and protruding outward to rotationally support one end of the driving shaft, and a movable end detachably mounted on the fixed part to rotationally support the other end of the driving shaft. A spacing space forming the mounting groove is arranged between the fixed end and the movable end. The movable end is detachably mounted, which facilitates the installation and disassembly of the grinding roller and is more practical.

[0012] Preferably, the fixed part is provided with an arc-shaped positioning contact surface, the movable end is provided with an arc-shaped contact end corresponding to the arc-shaped positioning contact surface, and the inside of the arc-shaped positioning contact surface is provided with a stepped surface opened on the fixed part to limit the movable end. The arc-shaped positioning contact surface and the arc-shaped contact end are provided to ensure accurate installation and positioning of the movable end and to ensure the trimming accuracy of the grinding roller on the grinding wheel.

[0013] Preferably, the horizontal feeding mechanism comprises a track seat arranged at the lower end of the base and a first screw transmission mechanism arranged on the track seat to drive the base to slide relative to the track seat. The vertical feeding mechanism comprises a support seat arranged at the lower end of the track seat in a sliding manner and a second screw transmission mechanism arranged on the support seat to drive the track seat to slide.

[0014] Preferably, the control system is connected with the vertical feeding mechanism, the horizontal feeding mechanism and the rotating mechanism. An electronic inclinometer is mounted on the roller mounting seat to detect the rotation angle of the roller mounting seat and the grinding roller. The electronic inclinometer is connected with the control system to transmit the detected angle signal to the control system.

[0015] Preferably, a trimming method of a trimming mechanism for a centerless outer thread grinding machine grinding wheel comprises the following steps: Step 1: The drive unit drives the worm gear to rotate, which in turn drives the adjusting sleeve, roller mounting seat and grinding roller to rotate. During the rotation, the electronic inclinometer detects the angle in real time. The electronic inclinometer feeds the detection results back to the control system in real time, which then controls the drive unit to drive the grinding roller to rotate, so that the axis of the grinding roller is at a corresponding angle to the axis of the grinding wheel to be dressed. Step 2: The drive motor starts and drives the rotating shaft to rotate. The rotating shaft drives the first bevel gear to rotate, which in turn drives the transmission shaft to rotate through the first bevel gear and the second bevel gear. This drives the second pulley to rotate through the first pulley and the belt, which in turn drives the drive shaft and the grinding roller to rotate. Step 3: The horizontal feed mechanism moves the grinding roller to the leftmost end of the grinding wheel. Then, the vertical feed mechanism moves the grinding roller towards the outer working surface of the grinding wheel until it contacts the grinding wheel to grind the threads on the outer side of the grinding wheel. Next, the control system controls the vertical and horizontal feed mechanisms to move the grinding roller back away from the grinding wheel and move it to the right by one thread length before moving it towards the outer working surface of the grinding wheel again to grind the threads on the outer side of the grinding wheel. The above operation is repeated until the grinding roller has finished dressing the entire outer working surface of the grinding wheel from left to right. During the grinding process, the CNC system controls the dressing path of the grinding roller. After topology calculation, the grinding wheel is precisely dressed into a matrix-like annular curved surface thread profile with a slight concavity in the middle.

[0016] The beneficial effects of this invention are as follows: This invention uses a rotary mechanism to drive the grinding roller to rotate, thereby adjusting the grinding angle of the grinding roller to dress grinding wheels with different processing requirements. It also includes a control system and vertical and horizontal feed mechanisms connected to the control system. By controlling the vertical and horizontal feed mechanisms to drive the dressing path of the grinding roller, a matrix-like annular curved surface thread profile with a slightly concave center is precisely dressed on the grinding wheel. This curved surface thread profile is used to counteract the system elastic tool deflection caused by the grinding force during the grinding of wide grinding wheels. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 Exploded view of grinding roller, base, rotating shaft and adjusting sleeve; Figure 3 This is a schematic diagram of the roller mounting base. Figure 4 This is a schematic diagram of the installation of the rotating shaft and the adjusting sleeve; Figure 5 for Figure 4 View in the AA direction; Figure 6 The mounting structure for adjusting the sleeve when a drive rod is provided; Figure 7 This is a schematic diagram showing the positions of the grinding wheel and the grinding roller; Figure 8 This is a top view of the workpiece when the grinding wheel and lead screw are in operation. Figure 9 This is a front view of the workpiece when the grinding wheel and lead screw are in operation.

[0018] Explanation of reference numerals in the attached figures: 1. Grinding roller; 2. Vertical feed mechanism; 2-1. Support base; 2-2. Second lead screw drive mechanism; 3. Horizontal feed mechanism; 3-1. Track base; 3-2. First lead screw drive mechanism; 4. Rotary mechanism; 4-1. Adjusting sleeve; 4-2. Roller mounting base; 4-2-1. Fixed part; 4-2-2. Fixed end; 4-2-3. Movable end; 5. Base; 6. Drive motor; 7. Rotary shaft; 8. Worm gear; 9. Drive worm. 10. Rod, 11. Mounting slot, 12. Drive shaft, 13. First bevel gear, 14. Second bevel gear, 15. Transmission shaft, 16. First pulley, 17. Second pulley, 18. Belt, 19. Arc-shaped positioning contact surface, 20. Arc-shaped contact end, 21. Stepped surface, 21. Grinding wheel, 21-1. Wheel body, 21-2. Grinding wheel holder, 22. Drive rod, 23. Actuating part, 24. Follower rod, 25. Lead screw workpiece, 26. Electronic inclinometer. Detailed Implementation

[0019] To further illustrate the technical means and effects of the present invention in achieving its intended purpose, the following detailed description of the specific implementation methods, structures, features, and effects of the present invention, in conjunction with the accompanying drawings and preferred embodiments, is provided below.

[0020] See attached document Figure 1As shown: This embodiment discloses a dressing mechanism for a centerless external thread grinding machine's grinding wheel. The grinding wheel 21 of the centerless external thread grinding machine is primarily a wide grinding wheel with a certain length. A relatively long grinding plane is provided on the outer surface of the grinding wheel 21, and several parallel annular grinding protrusions for grinding the lead screw are correspondingly provided on the grinding plane. This allows for efficient one-pass grinding of the lead screw workpiece 25 through the corresponding long grinding plane, achieving rough grinding, semi-finish grinding, finish grinding, and smooth grinding of the thread on the lead screw workpiece 25. The precise thread profile is mapped onto the lead screw workpiece 25. The dressing mechanism in this embodiment corrects the thread grinding protrusions on the outer surface of the grinding wheel 21, ensuring that the centerless external thread grinding machine meets the corresponding requirements when processing the lead screw's external thread. The dressing mechanism in this embodiment includes components corresponding to the grinding wheel... The system comprises a grinding roller 1 driven by a drive device to rotate around a central axis, a vertical feed mechanism 2 that moves the grinding roller 1 back and forth relative to the grinding wheel, a horizontal feed mechanism 3 that moves the grinding roller 1 left and right, and a rotary mechanism 4 that rotates the grinding roller 1 so that the axis of the grinding roller 1 is at a certain angle to the axis of the grinding wheel. Correspondingly, the grinding roller 1 is provided with grinding grooves corresponding to the thread grinding protrusions on the outer surface of the grinding wheel. During grinding dressing, the protrusions on the grinding wheel after machining correspond to the grinding grooves on the grinding roller 1, that is, a matrix-like annular thread profile opposite to the target thread profile is precisely dressed on the circumference of the grinding wheel. Therefore, when further machining the external thread of the lead screw using the grinding wheel, the precise thread profile on the grinding roller 1 is mapped onto the lead screw workpiece. Simultaneously, as... Figure 8 and 9 As shown, through the coordinated movement of the vertical feed mechanism 2 and the horizontal feed mechanism 3, the grinding roller 1 can be driven to grind from the left end to the right end of the grinding wheel and precisely dressed on the grinding wheel into a matrix-type annular curved surface thread profile with a slight concavity in the middle. The corresponding matrix-type annular curved surface thread profile on the grinding wheel serves as a pre-compensation shape to counteract the system elastic tool deflection caused by the grinding force during the grinding of the lead screw workpiece. At the same time, it also ensures that the processed part of the lead screw workpiece 25 is in complete contact and fit with the matrix-type annular curved surface thread profile on the outer side of the grinding wheel 21 during the grinding process. This allows the lead screw workpiece 25 to achieve efficient one-pass grinding, realizing rough grinding, semi-finish grinding, fine grinding, and finishing grinding of the thread of the lead screw workpiece 25. The precise thread profile on the corresponding grinding roller 1 is mapped onto the lead screw workpiece, and finally, a thread with consistent pitch diameter and accurate thread profile is ground on the lead screw workpiece.

[0021] Furthermore, such as Figure 1 , Figure 2 and Figure 7As shown, the drive device includes a base 5, a drive motor 6 mounted on the base 5, a rotating shaft 7 connected to the output end of the drive motor 6 and rotatably connected to the base 5, and a transmission mechanism connected to the rotating shaft 7 for driving the grinding roller 1 to rotate. The base 5 is positioned opposite the grinding roller 1 on the side away from the grinding wheel. In use, the drive motor 6 drives the rotating shaft 7 to rotate, which in turn drives the grinding roller 1 to rotate around its central axis via the transmission mechanism. Further, as... Figure 2 As shown, the rotary mechanism 4 in this embodiment includes an adjusting sleeve 4-1 rotatably connected to the base 5 and rotatably mounted on the outside of the rotating shaft 7, a roller mounting seat 4-2 mounted on the adjusting sleeve 4-1 for mounting the grinding roller 1, and a rotating mechanism for driving the adjusting sleeve 4-1 to rotate. The rotating mechanism drives the adjusting sleeve 4-1 to rotate, thereby adjusting the axis of the grinding roller 1 to correspond with the axis of the grinding wheel; as shown Figure 2 and Figure 4 As shown, the rotating mechanism in this embodiment can be a drive structure that directly drives the adjusting sleeve 4-1 to rotate. Specifically, the rotating mechanism includes a worm gear 8 installed on the outside of the adjusting sleeve 4-1 for driving the adjusting sleeve 4-1 to rotate, and a drive worm 9 rotatably connected to the base 5 and driven by the worm gear 8 for driving the worm gear 8 to rotate. The drive worm 9 can be driven by a drive component or manually rotated. The corresponding drive component can be a control motor installed on the base 5 and connected to the drive worm 9; furthermore, such as Figure 6 and 7 As shown, since the grinding roller 1 mainly performs dressing grinding on the grinding wheel 21, the axis X2 of the grinding roller 1 should be aligned with the axis X1 of the grinding wheel 21 to achieve accurate dressing of the grinding wheel 21 by the grinding roller 1. To ensure that the axis X2 of the grinding roller 1 is aligned with the axis X1 of the grinding wheel 21, in this embodiment, the rotating mechanism can also simultaneously adjust the axis X2 of the grinding roller 1 while the axis X1 of the grinding wheel 21 is being rotated. Specifically, as shown... Figure 6 and 7 As shown, the grinding wheel 21 includes a horizontally arranged wheel body 21-1 and a grinding wheel frame 21-2 for mounting the wheel body 21-1 and driving the wheel body 21-1 to rotate around the B axis. The rotating mechanism in this embodiment includes a drive rod 22 fixed to the outside of the adjusting sleeve 4-1 and extending outward, a prying part 23 sleeved on the outside of the drive rod 22, and a follower rod 24 connected to the prying part 23 and mounted on the grinding wheel 21. When the grinding wheel 21 is rotated around the B axis to adjust the axis X1 of the grinding wheel 21, the drive rod 22 is driven by the follower rod 24 and the prying part 23 to drive the adjusting sleeve 4-1 to rotate, thereby adjusting the grinding roller 1 and the grinding wheel 21 to rotate synchronously, so that the axis X2 of the grinding roller 1 and the axis X1 of the grinding wheel 21 after rotation adjustment are in the corresponding positions, thereby better ensuring the dressing accuracy of the grinding roller 1. Specifically, such as Figure 3 As shown, in this embodiment, the roller mounting base 4-2 is provided with a mounting groove 10 for mounting the grinding roller 1 on the side away from the adjusting sleeve 4-1. The grinding roller 1 is equipped with a drive shaft 11 that drives the grinding roller 1 to rotate and is rotatably connected in the roller mounting base 4-2. The adjusting sleeve 4-1 is coaxially arranged with the rotating shaft 7.

[0022] Based on the above, such as Figure 3 and Figure 5 As shown, the transmission mechanism in this embodiment includes a first bevel gear 12 mounted on a rotating shaft 7 and located inside a roller mounting base 4-2, a second bevel gear 13 disposed inside the roller mounting base 4-2 and connected to the first bevel gear 12, a transmission shaft 14 rotatably mounted inside the roller mounting base 4-2 and driven to rotate by the second bevel gear 13, a first pulley 15 mounted outside the transmission shaft 14 and driven to rotate by the transmission shaft 14, a second pulley 16 correspondingly disposed outside the drive shaft 11 and driving the drive shaft 11 to rotate, and a belt 17 connected to the outside of the first pulley 15 and the second pulley 16. The rotating shaft 7 drives the first bevel gear 12 to rotate, which in turn drives the second bevel gear 13 and the transmission shaft 14 to rotate. The transmission shaft 14 then drives the first pulley 15 to rotate, so that the second pulley 16 drives the drive shaft 11 to rotate under the action of the belt 17. The drive shaft 11 then drives the grinding roller 1 to perform rotary grinding. Furthermore, to facilitate the installation and removal of the grinding roller 1, in this embodiment, the roller mounting base 4-2 includes a fixed part 4-2-1 mounted on the adjusting sleeve 4-1, a fixed end 4-2-2 protruding from the fixed part 4-2-1 for rotatably supporting one end of the drive shaft 11, and a movable end 4-2-3 detachably mounted on the fixed part 4-2-1 for rotatably supporting the other end of the drive shaft 11. A space is provided between the fixed end 4-2-2 and the movable end 4-2-3 to form a mounting groove 10. Therefore, when installing the grinding roller 1, the movable end 4-2-3 is first removed, the drive shaft 11 with the grinding roller 1 is inserted into the fixed end 4-2-2, and then the movable end 4-2-3 is reinstalled so that the drive shaft 11 is inserted into the movable end 4-2-3 to install the grinding roller 1. Furthermore, as... Figure 3As shown, in this embodiment, the fixed part 4-2-1 is provided with an arc-shaped positioning contact surface 18, and the movable end 4-2-3 is provided with an arc-shaped contact end 19 corresponding to the arc-shaped positioning contact surface 18. The inner side of the arc-shaped positioning contact surface 18 is provided with a stepped surface 20 opened on the fixed part 4-2-1 to limit the movable end. During installation, the movable end 4-2-3 is positioned by the arc-shaped positioning contact surface 18 and the arc-shaped contact end 19, so that the mounting hole on the movable end 4-2-3 for mounting the drive shaft 11 corresponds to the positioning hole on the fixed end 4-2-2, so as to ensure the accurate positioning and installation of the drive shaft 11 and the grinding roller 1. The movable end 4-2-3 can be detachably fixed to the fixed part 4-2-1 by means of screws.

[0023] Furthermore, such as Figure 1 As shown, in this embodiment, in order to ensure the stable driving of the horizontal feed mechanism 3 and the vertical feed mechanism 2, the horizontal feed mechanism 3 includes a track seat 3-1 disposed at the lower end of the base and a first lead screw transmission mechanism 3-2 disposed on the track seat 3-1 for driving the base 5 to slide relative to the track seat 3-1. The vertical feed mechanism 2 includes a support seat 2-1 disposed relative to the lower end of the track seat 3-1 and a second lead screw transmission mechanism 2-2 disposed on the support seat 2-1 for driving the track seat 3-1 to slide. The vertical feed mechanism 2 can be a double lead screw feed mode with a large span to ensure the stable operation of the grinding roller 1 when grinding the grinding wheel.

[0024] Furthermore, to achieve automated processing and closed-loop control, the dressing mechanism in this embodiment also includes a control system connected to the vertical feed mechanism 2, the horizontal feed mechanism 3, and the rotary mechanism 4. An electronic inclinometer 26 is installed on the roller mounting base 4-2 to detect the rotation angle of the roller mounting base 4-2 and the grinding roller 1. The electronic inclinometer 26 is connected to the control system to transmit the detected angle signal to the control system. Thus, when the axis angle of the grinding roller 1 is adjusted by rotation, the electronic inclinometer 26 can detect it in real time and feed the corresponding data back to the control system. The control system then further controls the rotation of the rotary mechanism 4 to ensure that the axis of the grinding roller 1 can be accurately adjusted to the set scheduling position. The control system can also further control the vertical feed mechanism 2 and the horizontal feed mechanism 3 to drive the grinding roller 1 to accurately dress a matrix-like annular curved surface thread profile with a slightly concave center on the wide grinding wheel 21. This curved surface thread profile is used to offset the system elastic tool deflection caused by the grinding force during the wide grinding wheel grinding process.

[0025] Correspondingly, this embodiment also discloses a dressing method for a dressing mechanism of a centerless external thread grinding machine wheel, including the following steps: Step 1: The driving component drives the worm gear 9 to rotate the worm wheel 8, which in turn drives the adjusting sleeve 4-1, the roller mounting seat 4-2, and the grinding roller 1 to rotate. During the rotation, the electronic inclinometer 26 performs real-time angle detection. The electronic inclinometer 26 feeds the detection results back to the control system in real time, which then controls the driving component to drive the grinding roller 1 to rotate, so that the axis of the grinding roller 1 forms a corresponding angle with the axis of the grinding wheel to be dressed. Step 2: The drive motor 6 starts and drives the rotating shaft 7 to rotate. The rotating shaft 7 drives the first bevel gear 12 to rotate, which in turn drives the transmission shaft 14 to rotate through the first bevel gear 12 and the second bevel gear 13. This drives the second pulley 16 to rotate through the first pulley 15 and the belt 17, which in turn drives the drive shaft 11 and the grinding roller 1 to rotate. Step 3: The horizontal feed mechanism 3 drives the grinding roller 1 to move to the leftmost end of the grinding wheel. Then, the vertical feed mechanism 2 drives the grinding roller 1 to feed towards the outer working surface of the grinding wheel to be dressed until it contacts the grinding wheel to be dressed and grinds the thread on the outer side of the grinding wheel. Then, the control system controls the vertical feed mechanism 2 and the horizontal feed mechanism 3 to drive the grinding roller 1 to retreat away from the grinding wheel and move to the right by one thread distance before feeding towards the outer working surface of the grinding wheel again to grind the thread on the outer side of the grinding wheel. Then, the above operation is repeated until the grinding roller 1 completes the dressing of the entire outer working surface of the grinding wheel from left to right. During the above grinding process, the dressing path of the grinding roller 1 is controlled by the CNC system. After topology calculation, the grinding wheel is accurately dressed into a matrix-type annular curved surface thread profile with a slight concavity in the middle.

[0026] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A dressing mechanism for a centerless external thread grinding wheel, characterized in that: It includes a grinding roller (1) that is set in relation to the grinding wheel (21) and driven to rotate around the axis by a drive device; a vertical feed mechanism (2) that drives the grinding roller (1) to move back and forth relative to the grinding wheel (21); a horizontal feed mechanism (3) that drives the grinding roller (1) to move left and right; and a rotary mechanism (4) that drives the grinding roller (1) to rotate so that the axis of the grinding roller (1) is set at a certain angle to the axis of the grinding wheel (21).

2. The dressing mechanism for a centerless external thread grinding wheel according to claim 1, characterized in that: The drive device includes a base (5), a drive motor (6) mounted on the base (5), a rotating shaft (7) connected to the output end of the drive motor (6) and rotatably connected to the base (5), and a transmission mechanism connected to the rotating shaft (7) for driving the grinding roller (1) to rotate.

3. The dressing mechanism for a centerless external thread grinding wheel according to claim 2, characterized in that: The rotary mechanism (4) includes an adjusting sleeve (4-1) rotatably connected to the base (5) and rotatably mounted on the outside of the rotating shaft (7), a roller mounting seat (4-2) mounted on the adjusting sleeve (4-1) for mounting the grinding roller (1), and a rotating mechanism for driving the rotating adjusting sleeve (4-1) to rotate. The rotating mechanism drives the adjusting sleeve (4-1) to rotate, thereby adjusting the axis of the grinding roller (1) to correspond with the axis of the grinding wheel (21).

4. The dressing mechanism for a centerless external thread grinding wheel according to claim 3, characterized in that: The rotating mechanism includes a worm gear (8) installed on the outside of the adjusting sleeve (4-1) for driving the adjusting sleeve (4-1) to rotate, and a drive worm (9) rotatably connected to the base (5) and driven by the worm gear (8) for driving the worm gear (8) to rotate. The drive worm (9) can be driven to rotate by a drive component.

5. A dressing mechanism for a centerless external thread grinding wheel according to claim 3, characterized in that: The rotating mechanism includes a drive rod (22) fixed to the outside of the adjusting sleeve (4-1) and extending outward, a prying part (23) sleeved on the outside of the drive rod (22), and a follower rod (24) connected to the prying part (23) and installed on the grinding wheel (21). When the grinding wheel (21) is rotated to adjust the axis of the grinding wheel (21), the drive rod (22) is driven by the follower rod (24) and the prying part (23) to drive the adjusting sleeve (4-1) to rotate, thereby adjusting the grinding roller (1) and the grinding wheel (21) to rotate synchronously.

6. A dressing mechanism for a centerless external thread grinding wheel according to claim 4 or 5, characterized in that: The roller mounting base (4-2) has a mounting groove (10) for mounting the grinding roller (1) on the side away from the adjusting sleeve (4-1). A drive shaft (11) is installed inside the grinding roller (1) and rotatably connected to the roller mounting base (4-2) to drive the grinding roller (1) to rotate. The adjusting sleeve (4-1) is coaxially arranged with the rotating shaft (7). The transmission mechanism includes a first bevel gear (12) mounted on the rotating shaft (7) and located inside the roller mounting base (4-2), and a... The first bevel gear (13) is connected to the first bevel gear (12) for transmission. The second bevel gear (14) is rotatably installed in the roller mounting seat (4-2) and driven to rotate by the second bevel gear (13). The first pulley (15) is installed outside the transmission shaft (14) and driven to rotate by the transmission shaft (14). The second pulley (16) is correspondingly set outside the drive shaft (11) and drives the drive shaft (11) to rotate. The belt (17) is connected to the outside of the first pulley (15) and the second pulley (16) for transmission.

7. A dressing mechanism for a centerless external thread grinding wheel according to claim 6, characterized in that: The roller mounting base (4-2) includes a fixed part (4-2-1) mounted on the adjusting sleeve (4-1), a fixed end (4-2-2) protruding from the fixed part (4-2-1) for rotating and supporting one end of the drive shaft (11), and a movable end (4-2-3) detachably mounted on the fixed part (4-2-1) for rotating and supporting the other end of the drive shaft (11). A space is provided between the fixed end (4-2-2) and the movable end (4-2-3) to form the mounting groove (10).

8. A dressing mechanism for a centerless external thread grinding wheel according to claim 7, characterized in that: The fixed part (4-2-1) is provided with an arc-shaped positioning contact surface (18), and the movable end (4-2-3) is provided with an arc-shaped contact end (19) corresponding to the arc-shaped positioning contact surface (18). The inner side of the arc-shaped positioning contact surface (18) is provided with a stepped surface (20) opened on the fixed part (4-2-1) for limiting the movable end.

9. A dressing mechanism for a centerless external thread grinding wheel according to claim 4, characterized in that: It also includes a control system connected to the vertical feed mechanism (2), the horizontal feed mechanism (3) and the rotary mechanism (4). An electronic inclinometer (26) for detecting the rotation angle of the roller mounting base (4-2) and the grinding roller (1) is installed on the roller mounting base (4-2). The electronic inclinometer (26) is connected to the control system to transmit the detected angle signal to the control system.

10. A dressing method for a centerless external thread grinding wheel dressing mechanism according to claim 9, comprising the following steps: Step 1: The driving component drives the worm gear (9) to rotate the worm wheel (8), which in turn drives the adjusting sleeve (4-1), the roller mounting seat (4-2) and the grinding roller (1) to rotate through the worm wheel (8). During the rotation, the electronic inclinometer (26) performs real-time angle detection. The electronic inclinometer (26) feeds the detection results back to the control system in real time, which then controls the driving component to drive the grinding roller (1) to rotate, so that the axis of the grinding roller (1) and the axis of the grinding wheel (21) to be dressed form a corresponding angle. Step 2: The drive motor (6) starts and drives the rotating shaft (7) to rotate. The rotating shaft (7) drives the first bevel gear (12) to rotate, and then drives the transmission shaft (14) to rotate through the first bevel gear (12) and the second bevel gear (13). Then, the second pulley (16) is driven to rotate through the first pulley (15) and the belt (17), and then drives the drive shaft (11) and the grinding roller (1) to rotate. Step 3: The horizontal feed mechanism (3) drives the grinding roller (1) to move to the leftmost end of the grinding wheel (21). Then, the vertical feed mechanism (2) drives the grinding roller (1) to feed towards the outer working surface of the grinding wheel (21) to be dressed until it contacts the grinding wheel (21) to grind the threads on the outer side of the grinding wheel (21). Then, the control system controls the vertical feed mechanism (2) and the horizontal feed mechanism (3) to drive the grinding roller (1) to retreat away from the grinding wheel (21) and move to the right. After moving one thread length, feed the grinding wheel (21) back to the outer working surface to grind the thread on the outer side of the grinding wheel (21). Then repeat the above operation until the grinding roller (1) finishes dressing the entire outer working surface of the grinding wheel (21) from left to right. During the grinding process of the grinding roller (1), the dressing path of the grinding roller (1) is controlled by the CNC system. After topology calculation, the grinding wheel (21) is accurately dressed into a matrix-type annular curved surface thread profile with a slight concavity in the middle.

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