High-precision thread rolling machine and thread rolling method thereof

Abstract

The application relates to the technical field of motor accessories, in particular to a high-precision thread rolling machine. The thread rolling machine is characterized in that a grabbing fixing frame is arranged on the thread rolling machine and comprises a vertical fixing frame and a horizontal sliding rail fixedly connected with the top of the vertical fixing frame; the horizontal sliding rail is arranged along a direction perpendicular to the movement direction of a conveying mechanism; a cylinder sliding block moves along the horizontal sliding rail; the lower part of the cylinder sliding block is fixedly connected with a cylinder fixing frame; a cylinder is fixedly arranged on the cylinder fixing frame; a motor rotating shaft on the conveying mechanism is grabbed; the motor rotating shaft is vertically lifted and horizontally moved until the motor rotating shaft is above first thread rolling extrusion rollers and second thread rolling extrusion rollers; then the motor rotating shaft is released by the grabbing mechanism, and the free end of the motor rotating shaft is placed between the two first thread rolling extrusion rollers and the two second thread rolling extrusion rollers. The thread rolling process of the motor rotating shaft can be completely replaced by the operation of placing the motor rotating shaft by workers, the probability of workers being injured is reduced, and the thread rolling efficiency of the motor rotating shaft is improved.

Description

Technical Field

[0001] This invention relates to the field of motor parts technology, specifically to a high-precision thread rolling machine and its thread rolling method. Background Technology

[0002] The current machining process for motor shafts is as follows: bar stock → cutting → drilling holes at both ends → lathe machining → CNC milling → thread rolling → drilling holes → drilling threading holes → annealing → grinding. However, the thread rolling process involves manually placing the motor shaft, which has two drawbacks: firstly, it easily causes workers' fingers to be cut by the thread rolling machine; secondly, the processing efficiency is low. Currently, there is no automated production line designed specifically for manually placing motor shafts.

[0003] To address the above problems, a high-precision thread rolling machine and its thread rolling method are proposed. Summary of the Invention

[0004] The purpose of this invention is to provide a high-precision thread rolling machine and its thread rolling method. By setting up a conveying mechanism, a gripping mechanism, and a thread rolling mechanism, a vertical rotating component is used to drive the cylinder slider to move horizontally, thereby driving the gripping mechanism to move horizontally, and the cylinder is used to achieve up and down lifting movement. When it is on the same horizontal plane as the motor shaft, the cooperation of different gripping parts solves the problem of easy damage to the motor shaft during thread rolling mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] A high-precision thread rolling machine and its thread rolling method include a conveying mechanism, a gripping mechanism, and a thread rolling mechanism; the gripping mechanism includes: a gripping fixing frame, a cylinder slider, a cylinder fixing frame, a fixing rod assembly, and a gripping assembly;

[0007] The gripping and fixing frame includes a vertical fixing frame and a horizontal slide rail fixedly connected to the top of the vertical fixing frame; the horizontal slide rail is arranged along a direction perpendicular to the movement of the conveying mechanism; the cylinder slider moves along the horizontal slide rail; the lower part of the cylinder slider is fixedly connected to the cylinder fixing frame; a cylinder is fixedly installed on the cylinder fixing frame;

[0008] The cylinder drives the gripping mechanism to slide vertically up and down;

[0009] The lower end of the fixed rod assembly is fixedly connected to the gripping assembly; the fixed rod assembly slides along the horizontal direction to allow the gripping assembly to complete the gripping of the motor shaft;

[0010] The thread rolling mechanism includes two sets of symmetrically arranged first thread rolling extrusion rollers and second thread rolling extrusion rollers;

[0011] After the gripping mechanism grips the motor shaft, it places the free end of the motor shaft between the two first thread rolling extrusion rollers and the two second thread rolling extrusion rollers.

[0012] Preferably, the fixing rod assembly includes a first fixing rod and a second fixing rod; the gripping assembly includes a first gripping part and a second gripping part;

[0013] The bottom of the first fixing rod is fixedly connected to the first gripping part;

[0014] The bottom of the second fixing rod is fixedly connected to the second gripping part;

[0015] There are two first fixing rods, which are arranged in a triangular shape with the second fixing rod. The two first fixing rods and the second fixing rod move towards each other, and the two first gripping parts cooperate with the second gripping parts to grip the motor bearing.

[0016] Preferably, the fixing rod assembly includes a third fixing rod; the gripping assembly includes a third gripping part;

[0017] There are two third fixing rods, which are of equal size and arranged symmetrically from left to right. The two third fixing rods move towards each other and cooperate with the two third gripping parts to grip the motor bearing.

[0018] Preferably, the motor shaft includes a first protrusion, a second protrusion, a third protrusion, and a thread-rolling portion;

[0019] The diameters of the first protrusion, the second protrusion, the third protrusion, and the thread rolling portion decrease sequentially.

[0020] There are two of the second protrusion, the third protrusion, and the thread rolling part, all of which are symmetrically arranged relative to the first protrusion along the axial direction;

[0021] A first connecting portion is provided between the first protrusion and the second protrusion; the first connecting portion has a groove; the second gripping portion is provided with a protrusion corresponding to the groove of the first connecting portion;

[0022] The inner side of the second gripping part has the same shape as the outer wall of the first protrusion, the second protrusion and the first connecting part. The second gripping part completely covers the first protrusion and the first connecting part along the axial direction, and the second gripping part partially covers the second protrusion along the axial direction. The second gripping part is symmetrically arranged with respect to the center line of the rotation axis.

[0023] A second connecting portion is provided between the second protrusion and the third protrusion; the second connecting portion has a groove; the first gripping portion is provided with a protrusion corresponding to the groove of the second connecting portion;

[0024] The inner side of the first gripping part has the same shape as the outer wall of the second protrusion, the third protrusion and the second connecting part. The first gripping part completely covers the second connecting part along the axial direction, and the first gripping part partially covers the second protrusion and the third protrusion along the axial direction.

[0025] The two first gripping parts and the second gripping part are arranged in a triangular shape; a gripping buffer layer is provided on the surface of both the first gripping parts and the second gripping part.

[0026] Preferably, the motor shaft includes a first protrusion, a second protrusion, a third protrusion, and a thread-rolling portion;

[0027] The diameters of the first protrusion, the second protrusion, the third protrusion, and the thread rolling portion decrease sequentially.

[0028] The second protrusion, the third protrusion, and the thread rolling portion are symmetrically arranged relative to the first protrusion along the axial direction;

[0029] The inner surface of the third gripping part is formed with a cavity corresponding to the free end of the thread rolling part, and the two third gripping parts complete the gripping of the two thread rolling parts through the cavity;

[0030] Both of the third gripping parts have a gripping buffer layer on their surfaces.

[0031] Preferably, the conveying mechanism includes two parallel conveyor belts, namely a first conveyor belt and a second conveyor belt; the thread rolling mechanism further includes a cutting fluid spray pipe, which is disposed above the first thread rolling extrusion roller and the second thread rolling extrusion roller;

[0032] The surface of the first conveyor belt is provided with a drop buffer layer.

[0033] Preferably, the first conveyor belt consists of inclined surfaces arranged symmetrically along the central face of the first conveyor belt's transport direction;

[0034] A cutting fluid collection hole is provided on the inclined surface; a cutting fluid collection cavity with an upper opening is provided on the lower part of the inclined surface corresponding to the position of the gripping mechanism.

[0035] Preferably, the first thread rolling extrusion roller and the second thread rolling extrusion roller rotate in opposite directions.

[0036] Preferably, the first thread rolling extrusion roller is connected to a first torque sensor; the second thread rolling extrusion roller is rotatably connected to a second torque sensor; a solenoid valve is installed on the cutting fluid spray pipe; the first torque sensor, the second torque sensor, and the solenoid valve are electrically connected to the controller.

[0037] A thread rolling method includes the following steps:

[0038] S1: Debugging, the entire high-precision thread rolling machine is dusted and debugged to ensure that all equipment is in normal working condition;

[0039] S2: Grabbing. The motor shaft is located on the second conveyor belt. The vertical rotation assembly is activated, and the cylinder slider is adjusted by the lead screw to move along the horizontal guide rail. When it reaches above the motor shaft to be gripped, the cylinder starts and drives the gripping mechanism to move downward. When it reaches the same horizontal plane as the motor shaft, two third fixed rods move towards each other, and the two third gripping parts cooperate to complete the gripping of the motor bearing. After gripping the motor bearing, the cylinder retracts to lift the bearing.

[0040] S3: Release, activate the vertical rotation assembly, and move the slider of the lead screw adjusting cylinder along the horizontal guide rail; when it reaches above the thread rolling mechanism to be gripped, the cylinder starts to drive the gripping mechanism to move downward, placing the free end of the motor shaft between the two first thread rolling extrusion rollers and the two second thread rolling extrusion rollers; when the motor shaft reaches the predetermined position, the two third gripping parts move horizontally to complete the release of the motor shaft bearing; after the release is completed, the cylinder starts to drive the gripping mechanism to move upward;

[0041] S4: Thread rolling. Start the first and second thread rolling extrusion rollers to complete the thread rolling process on the motor shaft; after the thread rolling process is completed, stop the rotation of the first and second thread rolling extrusion rollers.

[0042] S5: Grab again, the cylinder starts and drives the gripping mechanism to move downward until the gripping mechanism reaches the same horizontal plane as the motor shaft; the two third gripping parts move horizontally to complete the clamping of the motor shaft; the cylinder starts and drives the gripping mechanism to move upward;

[0043] S6: Return to position, activate the vertical rotation assembly, and move the slider of the cylinder along the horizontal guide rail until it reaches the surface of the first conveyor belt; start the cylinder to drive the gripping mechanism to move downwards, and when it is 0.1-0.2m above the surface of the first conveyor belt, release the motor bearing by moving horizontally through the two third gripping parts; the motor shaft falls onto the surface of the first conveyor belt.

[0044] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0045] 1. At a distance of 0.1-0.2m above the surface of the first conveyor belt, the motor bearing is released by the horizontal movement of the gripping part; the motor shaft falls onto the surface of the first conveyor belt. When the thread-rolled motor shaft falls onto the first conveyor belt, the slope of the inclined surface allows the cutting fluid to flow down the wall. As the cutting fluid flows down the wall, it is collected by the cutting fluid collection hole and filtered, which greatly reduces the amount of cutting fluid used.

[0046] 2. The inner surfaces of the first and second gripping parts have the same shape as the outer walls of the second and third protrusions and the second connecting part. Furthermore, the first gripping part is equipped with protrusions corresponding to the grooves of the second connecting part, preventing the motor shaft from slipping during the gripping process. Three fixing components are included: the two first gripping parts and the second gripping part are arranged in a triangular shape to ensure stability during movement. A partial coverage design is employed: the second gripping part partially covers the second and third protrusions along the axial direction; this ensures clamping strength while reducing material loss during workpiece clamping. In addition, a gripping buffer layer is provided, which not only provides a buffering function to prevent stress damage to the workpiece but also absorbs cutting fluid from the surface, reducing cutting fluid accumulation in the recesses.

[0047] 3. By setting up a first torque sensor; the second thread rolling extrusion roller is rotatably connected to a second torque sensor, which can feed back different torque signals to the controller according to the needs of different machining models of motor shafts. Based on different machining requirements, the controller provides different distance and speed signals between the first thread rolling extrusion roller and the second torque sensor. By setting up a solenoid valve, which opens the valve the instant the torque data from the first thread rolling extrusion roller and the second torque sensor is received, the use of cutting fluid can be reduced. Attached Figure Description

[0048] Figure 1 This is a schematic diagram of the motor bearing structure of the present invention;

[0049] Figure 2 This is a front view of the motor bearing of the present invention;

[0050] Figure 3 This is a schematic diagram of the assembly line structure layout of the present invention;

[0051] Figure 4 This is a schematic diagram of the gripping structure at an angle according to Embodiment 1 of the present invention;

[0052] Figure 5 for Figure 4 Schematic diagram of the structure at point A;

[0053] Figure 6 This is a schematic diagram of the grasping structure from another angle according to Embodiment 1 of the present invention;

[0054] Figure 7 This is a schematic diagram of the grasping process of the grasping structure in Embodiment 1 of the present invention;

[0055] Figure 8 This is a schematic diagram of the grasping structure in Embodiment 2 of the present invention;

[0056] Figure 9 This is a schematic diagram of the grasping process in Embodiment 2 of the present invention;

[0057] Figure 10 This is a schematic diagram of the horizontal adjustment structure of the gripping mechanism of the present invention;

[0058] Figure 11 This is a front view of the horizontal adjustment of the gripping mechanism of the present invention;

[0059] Figure 12 This is a schematic diagram of the conveying mechanism of the present invention;

[0060] Figure 13 For the appendix Figure 12 A magnified view of a section at point B in the middle;

[0061] Figure 14 This is a flowchart of the thread rolling method of the present invention.

[0062] In the diagram: 1. Motor shaft; 11. First protrusion; 12. Second protrusion; 13. Third protrusion; 14. Thread rolling section; 11a. First connecting part; 12b. Second connecting part; 13c. Third connecting part; 21. First thread rolling extrusion roller; 22. Second thread rolling extrusion roller; 23. Cutting fluid spray pipe; 24. Extrusion motor; 3. Conveying mechanism; 31. First conveyor belt; 32. Second conveyor belt; 33. Motor shaft support frame; 4. Controller 5. Gripping and fixing frame; 5d. Rotating shaft center line; 51. Cylinder slider; 52. Cylinder fixing frame; 53. First fixing rod; 54. Second fixing rod; 55. First gripping part; 56. Second gripping part; 57. Third fixing rod; 58. Third gripping part; 59. Gripping buffer layer; 61. Vertical rotation assembly; 62. Rotation conversion cavity; 63. Sleeve; 64. Lead screw; 71. Inclined surface; 72. Cutting fluid collection hole; 73. Cutting fluid collection cavity. Detailed Implementation

[0063] Please see Figures 1 to 14 This invention provides a high-precision thread rolling machine and its thread rolling method, the technical solution of which is as follows:

[0064] A high-precision thread rolling machine and its thread rolling method include a conveying mechanism 3, a gripping mechanism, and a thread rolling mechanism; the gripping mechanism includes: a gripping fixing frame 5, a cylinder slider 51, a cylinder fixing frame 52, a fixing rod assembly, and a gripping assembly;

[0065] The gripping and fixing frame 5 includes a vertical fixing frame and a horizontal slide rail fixedly connected to the top of the vertical fixing frame; the horizontal slide rail is arranged in a direction perpendicular to the movement of the conveying mechanism 3; the cylinder slider 51 moves along the horizontal slide rail; the lower part of the cylinder slider 51 is fixedly connected to the cylinder fixing frame 52; a cylinder is fixedly installed on the cylinder fixing frame 52.

[0066] The cylinder drives the gripping mechanism to slide vertically up and down.

[0067] The lower end of the fixed rod assembly is fixedly connected to the gripping assembly; the fixed rod assembly slides horizontally to allow the gripping assembly to grip the motor shaft 1.

[0068] The thread rolling mechanism includes two sets of symmetrically arranged first thread rolling extrusion rollers 21 and second thread rolling extrusion rollers 22;

[0069] After the gripping mechanism grips the motor shaft 1, it places the free end of the motor shaft 1 between the two first thread rolling extrusion rollers 21 and the two second thread rolling extrusion rollers 22.

[0070] By setting up a gripping mechanism, the motor shaft 1 on the conveying mechanism 3 is gripped, and vertical lifting and horizontal movement are completed through the gripping mechanism until the motor shaft 1 reaches above the first thread rolling extrusion roller 21 and the second thread rolling extrusion roller 22. Then, the gripping mechanism releases the motor shaft 1, placing the free end of the motor shaft 1 between the two first thread rolling extrusion rollers 21 and the two second thread rolling extrusion rollers 22. After thread rolling is completed, the gripping mechanism grips the motor shaft 1 until it reaches the same horizontal plane as the motor shaft 1. The two third gripping parts 58 move horizontally to clamp the motor shaft 1. The cylinder is activated to drive the gripping mechanism to move upward. The gripping mechanism moves horizontally until the motor shaft 1 is transferred to the upper part of the conveying mechanism, and then it is released downward by the cylinder at a distance of 0.1-0.2m above the surface of the conveying mechanism.

[0071] In one embodiment of the present invention, the fixing rod assembly includes a first fixing rod 53 and a second fixing rod 54; the gripping assembly includes a first gripping part 55 and a second gripping part 56.

[0072] The bottom of the first fixing rod 53 is fixedly connected to the first gripping part 55;

[0073] The bottom of the second fixing rod 54 is fixedly connected to the second gripping part 56;

[0074] There are two first fixing rods 53, which are arranged in a triangular shape with the second fixing rod 54. The two first fixing rods 53 and the second fixing rod 54 move towards each other and complete the gripping of the motor shaft bearing by cooperating with the two first gripping parts 55 and the second gripping part 56.

[0075] By setting two first fixing rods 53 and a second fixing rod 54 to cooperate, the gripping of the motor shaft 1 can be completed very stably while reducing the force on the component.

[0076] In one embodiment of the present invention, the fixing rod assembly includes a third fixing rod 57; the gripping assembly includes a third gripping part 58.

[0077] There are two third fixing rods 57. The two third fixing rods 57 are of equal size and arranged symmetrically from left to right. The two third fixing rods 57 move towards each other and cooperate with the two third gripping parts 58 to complete the gripping of the motor shaft 1 bearing.

[0078] By using gripping parts at both ends, the number of gripping components can be reduced, thereby reducing equipment maintenance costs.

[0079] In one embodiment of the present invention, the motor shaft 1 includes a first protrusion 11, a second protrusion 12, a third protrusion 13, and a thread rolling portion 14;

[0080] The diameters of the first protrusion 11, the second protrusion 12, the third protrusion 13, and the thread rolling part 14 decrease sequentially;

[0081] There are two of each of the second protrusion 12, the third protrusion 13 and the thread rolling part 14, all of which are symmetrically arranged relative to the first protrusion 11 along the axial direction.

[0082] A first connecting portion 11a is provided between the first protrusion 11 and the second protrusion 12; the first connecting portion 11a has a groove; the second gripping portion 56 is provided with a protrusion corresponding to the groove of the first connecting portion 11a;

[0083] The inner surface of the second gripping part 56 has the same shape as the outer wall of the first protrusion 11, the second protrusion 12 and the first connecting part 11a. The second gripping part 56 completely covers the first protrusion 11 and the first connecting part 11a along the axial direction. The second gripping part 56 partially covers the second protrusion 12 along the axial direction. The second gripping part 56 is symmetrically arranged relative to the center line 5d of the rotating shaft.

[0084] A second connecting portion 12b is provided between the second protrusion 12 and the third protrusion 13; the second connecting portion 12b has a groove; the first gripping portion 55 is provided with a protrusion corresponding to the groove of the second connecting portion 12b;

[0085] The inner side of the first gripping part 55 has the same shape as the outer wall of the second protrusion 12, the third protrusion 13 and the second connecting part 12b. The first gripping part 55 completely covers the second connecting part 12b along the axial direction, and the first gripping part 55 partially covers the second protrusion 12 and the third protrusion 13 along the axial direction.

[0086] The two first gripping parts 55 and the second gripping part 56 are arranged in a triangular shape; both the first gripping parts 55 and the second gripping part 56 are provided with gripping buffer layers 59.

[0087] The inner surfaces of the first gripping part 55 and the second gripping part 56 have the same shape as the outer walls of the second protrusion 12, the third protrusion 13, and the second connecting part 12b. Furthermore, the first gripping part 55 is equipped with protrusions corresponding to the grooves of the second connecting part 12b, which prevents the motor shaft 1 from slipping during the gripping process. Three fixing components are used: the two first gripping parts 55 and the second gripping part 56 are arranged in a triangular shape to ensure stability during movement. A partial coverage design is employed: the second gripping part 56 partially covers the second protrusion 12 and the third protrusion 13 along the axial direction; this ensures clamping strength while reducing material loss during workpiece clamping. In addition, a gripping buffer layer 59 is provided, which, while providing a buffer function to prevent stress damage to the workpiece, also absorbs cutting fluid from the surface, reducing cutting fluid accumulation in the recesses.

[0088] In one embodiment of the present invention, the motor shaft 1 includes a first protrusion 11, a second protrusion 12, a third protrusion 13, and a thread rolling portion 14;

[0089] The diameters of the first protrusion 11, the second protrusion 12, the third protrusion 13, and the thread rolling part 14 decrease sequentially;

[0090] The second protrusion 12, the third protrusion 13 and the thread rolling part 14 are symmetrically arranged relative to the first protrusion 11 along the axial direction;

[0091] The inner surface of the third gripping part 58 has a cavity corresponding to the free end of the thread rolling part 14, and the two third gripping parts 58 complete the gripping of the two thread rolling parts 14 through the cavity.

[0092] Both third gripping parts 58 have gripping buffer layers 59 on their surfaces.

[0093] By incorporating a third gripping section 58 with a cavity, gripping of the motor shaft 1 can be achieved using only two mechanisms. Furthermore, the gripping buffer layer 59 not only provides a buffering function to prevent stress damage to the workpiece during clamping but also absorbs cutting fluid from the surface, reducing cutting fluid accumulation in the recesses.

[0094] As one embodiment of the present invention, the conveying mechanism 3 includes two parallel conveyor belts, namely a first conveyor belt 31 and a second conveyor belt 32; the thread rolling mechanism also includes a cutting fluid spray pipe 23, which is disposed above the first thread rolling extrusion roller 21 and the second thread rolling extrusion roller 22.

[0095] The surface of the first conveyor belt 31 is provided with a drop buffer layer.

[0096] The drop buffer layer of the first conveyor belt 31 can catch the motor shaft 1 during the drop process and shake off the cutting fluid adhering to the surface through vibration. Furthermore, due to the setting of the buffer layer, when the motor shaft 1 is released after thread rolling is completed above it, the release impact buffer layer can shake off the cutting fluid and a small amount of metal chips.

[0097] As one embodiment of the present invention, the first conveyor belt 31 is composed of inclined surfaces 71 arranged symmetrically along the central face of the first conveyor belt 31 in the transport direction of the first conveyor belt 31.

[0098] A cutting fluid collection hole 72 is provided on the inclined surface 71; a cutting fluid collection cavity with an upper opening is provided on the lower part of the inclined surface 71 corresponding to the position of the gripping mechanism. 73

[0099] Because of the inclined surface 71 provided in this invention, the slope of the inclined surface 71 allows the cutting fluid to flow down the wall. When the cutting fluid flows down the wall, it is collected in conjunction with the cutting fluid collection hole 72.

[0100] In one embodiment of the present invention, a filter screen is provided above the cutting fluid collection hole 72, which can filter out some metal debris.

[0101] In one embodiment of the present invention, the first thread rolling extrusion roller 21 and the second thread rolling extrusion roller 22 rotate in opposite directions.

[0102] By setting up four independent extrusion motors 24 (not shown in the figure), and using the first thread rolling extrusion roller 21 and the second thread rolling extrusion roller 22 to rotate in opposite directions, it is possible to achieve a balance of opposite torques at both ends of the motor shaft 1. This saves the electrical energy required for the extrusion motors 24 to rotate, and also reduces the wear of mechanical stress on the motor shaft 1.

[0103] In one embodiment of the present invention, a first thread rolling extrusion roller 21 is connected to a first torque sensor; a second thread rolling extrusion roller 22 is rotatably connected to a second torque sensor; a solenoid valve is provided on the pipe of the cutting fluid spray pipe 23; the first torque sensor, the second torque sensor and the solenoid valve are electrically connected to the controller 4.

[0104] By setting a first torque sensor and a second torque sensor rotatably connected to the second thread rolling extrusion roller 22, the torque signal can be fed back to the controller 4 according to the needs of the motor shaft 1 for different machining models. The controller 4 then provides different distance and speed signals between the first thread rolling extrusion roller 21 and the second torque sensor. By setting a solenoid valve, the valve opens the instant the first thread rolling extrusion roller 21 and the second torque sensor have torque data, which can reduce the use of cutting fluid.

[0105] In one embodiment of the present invention, the cutting fluid collected in the cutting fluid collection chamber is filtered and then added back into the cutting fluid circuit for recycling through the cutting fluid spray pipe 23, thereby reducing the waste of cutting fluid.

[0106] A thread rolling method includes the following steps:

[0107] S1: Debugging, the entire high-precision thread rolling machine is dusted and debugged to ensure that all equipment is in normal working condition;

[0108] S2: Grabbing. The motor shaft 1 is located on the second conveyor belt 32. The vertical rotation component 61 is activated, and the cylinder slider 51 is adjusted by the lead screw 64 to move along the horizontal guide rail. When it reaches above the motor shaft 1 to be gripped, the cylinder starts and drives the gripping mechanism to move downward. When it reaches the same horizontal plane as the motor shaft 1, two third fixed rods 57 move towards each other, and the two third gripping parts 58 cooperate to complete the gripping of the motor shaft 1 bearing. After gripping the motor shaft 1 bearing, the cylinder retracts to lift the bearing.

[0109] S3: Release, activate the vertical rotation assembly 61, and adjust the cylinder slider 51 along the horizontal guide rail via the lead screw 64; when it reaches above the thread rolling mechanism to be gripped, the cylinder starts to drive the gripping mechanism to move downward, placing the free end of the motor shaft 1 between the two first thread rolling extrusion rollers 21 and the two second thread rolling extrusion rollers 22; when the motor shaft 1 reaches the predetermined position, the two third gripping parts 58 move horizontally to complete the release of the motor shaft 1 bearing; after the release is completed, the cylinder starts to drive the gripping mechanism to move upward;

[0110] S4: Thread rolling, start the first thread rolling extrusion roller 21 and the second thread rolling extrusion roller 22 to complete the thread rolling process on the motor shaft 1; after the thread rolling process is completed, stop the rotation of the first thread rolling extrusion roller 21 and the second thread rolling extrusion roller 22;

[0111] S5: Grab again, the cylinder starts and drives the gripping mechanism to move downward until the gripping mechanism reaches the same horizontal plane as the motor shaft 1; the two third gripping parts 58 move horizontally to complete the clamping of the motor shaft 1; the cylinder starts and drives the gripping mechanism to move upward.

[0112] S6: Return to position, activate the vertical rotation assembly 61, adjust the cylinder slider 51 via the lead screw 64 to move along the horizontal guide rail until it reaches the surface of the first conveyor belt 31; start the cylinder to drive the gripping mechanism to move downwards, when it is 0.1-0.2m above the surface of the first conveyor belt 31, the two third gripping parts 58 move horizontally to release the motor shaft 1 bearing; the motor shaft 1 falls onto the surface of the first conveyor belt 31.

[0113] Working principle: The motor shaft 1 is located on the motor shaft 1 support frame on the second conveyor belt 32. The inner sidewall of the motor shaft 1 support frame is consistent with the outer wall structure of the third connecting part 13c of the motor shaft 1. Specifically, a third connecting part 13c is provided between the third protrusion 13 and the thread rolling part 14; the third connecting part 13c has a groove; the motor shaft 1 support frame is provided with a protrusion corresponding to the groove of the first connecting part 11a, and the motor shaft 1 support frame is symmetrically arranged with respect to the center line 5d of the shaft. This motor shaft 1 support frame structure can ensure the stable transportation of the motor shaft 1 on the second conveyor belt 32, and can also ensure that the specific gripping part structure of the two gripping mechanisms of the present invention can complete the gripping of the motor shaft 1. The vertical rotation assembly 61 is activated, and the cylinder slider 51 is adjusted by the lead screw 64 to move along the horizontal guide rail. When it reaches above the motor shaft 1 to be gripped, the cylinder is activated, driving the gripping mechanism to move downward. When it reaches the same horizontal plane as the motor shaft 1, the two third fixed rods 57 move towards each other, and the two third gripping parts 58 cooperate to grip the motor shaft 1 bearing. After gripping the motor shaft 1 bearing, the cylinder retracts to lift the bearing. The vertical rotation assembly 61 is activated, and the cylinder slider 51 is adjusted by the lead screw 64 to move along the horizontal guide rail. When it reaches above the thread rolling mechanism to be gripped, the cylinder is activated, driving the gripping mechanism to move downward, placing the free end of the motor shaft 1 between the two first thread rolling extrusion rollers 21 and the two second thread rolling extrusion rollers 22. When the motor shaft 1 reaches the predetermined position, the two third gripping parts 58 move horizontally to release the motor shaft 1 bearing. After release, the cylinder is activated, driving the gripping mechanism to move upward. The first and second thread rolling extrusion rollers 21 and 22 are started to complete the thread rolling process on the motor shaft 1. Cutting fluid spray pipes 23 are fixedly connected to both the first and second thread rolling extrusion rollers 21 and 22. A photoelectric sensor is installed below the cutting fluid spray pipe 23 at a position corresponding to the first protrusion 11. When the first protrusion 11 is detected, a signal is transmitted to the controller 4. The controller 4 controls the solenoid valve to open, and the cutting fluid is activated before the first and second thread rolling extrusion rollers 21 and 22 come into contact. After the thread rolling process is completed, the rotation of the first and second thread rolling extrusion rollers 21 and 22 is stopped. The cylinder is started, driving the gripping mechanism to move downwards until it reaches the same horizontal plane as the motor shaft 1. The two third gripping parts 58 move horizontally to clamp the motor shaft 1. The cylinder is then started, driving the gripping mechanism to move upwards. The vertical rotation assembly 61 is activated, and the cylinder slider 51 is adjusted by the lead screw 64 to move along the horizontal guide rail until it reaches the surface of the first conveyor belt 31. The cylinder is started to drive the gripping mechanism to move downward. When it is 0.1-0.2m above the surface of the first conveyor belt 31, the two third gripping parts 58 move horizontally to release the motor shaft 1 bearing. The motor shaft 1 falls onto the surface of the first conveyor belt 31.When the motor shaft 1, after thread rolling, falls onto the first conveyor belt 31, the slope of the first conveyor belt 31, composed of inclined surfaces 71, allows the cutting fluid to flow down the wall. As the cutting fluid flows down the wall, it is collected by the cutting fluid collection hole 72.

[0114] Figure 1 In section 2, the motor shaft 1 includes a first protrusion 11, a second protrusion 12, a third protrusion 13, and a thread-rolling portion 14. A first connecting portion 11a is provided between the first protrusion 11 and the second protrusion 12; a second connecting portion 12b is provided between the second protrusion 12 and the third protrusion 13; and a third connecting portion 13c is provided between the third protrusion 13 and the thread-rolling portion 14. The second protrusion 12, the third protrusion 13, and the thread-rolling portion 14 are symmetrically arranged with respect to the shaft centerline 5d.

[0115] like Figure 3 In the conveyor system, the second conveyor belt 32 and the first conveyor belt 31, arranged side by side, form a conveying mechanism. A motor shaft 1 support frame is fixedly mounted on the second conveyor belt 32. The inner wall of the motor shaft 1 support frame is consistent with the outer wall structure of the third connecting part 13c of the motor shaft 1. Specifically, a third connecting part 13c is provided between the third protrusion 13 and the thread rolling part 14. The third connecting part 13c has a groove. The motor shaft 1 support frame is provided with a protrusion corresponding to the groove of the first connecting part 11a, and the motor shaft 1 support frame is symmetrically arranged with respect to the shaft centerline 5d. This motor shaft 1 support frame structure can ensure the stable transport of the motor shaft 1 on the second conveyor belt 32, and can also ensure the gripping of the motor shaft 1 by the specific gripping part structure of the two gripping mechanisms of the present invention. The thread rolling mechanism includes a first thread rolling extrusion roller 21, a second thread rolling extrusion roller 22, a cutting fluid spray pipe 23, and an extrusion motor 24. The number of extrusion motors 24 is 4 (only 2 are shown in the figure to avoid obstruction). A cutting fluid spray pipe 23 is fixedly connected to the first thread rolling extrusion roller 21 and the second thread rolling extrusion roller 22. A solenoid valve is installed on the cutting fluid spray pipe 23, and the solenoid valve is electrically connected to the controller 4. The gripping and fixing frame 5 is perpendicular to the transmission direction of the conveying mechanism and is located above the first and second conveyor belts 32.

[0116] like Figure 4-7 The horizontally driven cylinder slider 51 can move along the horizontal slide rail on the gripping fixing frame 5. When it reaches the upper part of the motor shaft 1 to be gripped, the first gripping part 55 is moved horizontally by the first fixing rod 53, and the second gripping part 56 is moved horizontally by the second fixing rod 54. The gripping is completed by the opposing movement of the first fixing rod 53 and the second fixing rod 54, and the release is completed by the opposing movement of the first fixing rod 53 and the second fixing rod. Both the surface of the first gripping part 55 and the second gripping part 56 are provided with a gripping buffer layer 59.

[0117] like Figure 8-9 The horizontally driven cylinder slider 51 can move along the horizontal slide rail on the gripping fixed frame 5. When it reaches the upper part of the motor shaft 1 to be gripped, the two third fixed rods 57 drive the third gripping part 58 to move horizontally towards or away from each other to complete the gripping and release of the motor shaft 1.

[0118] like Figure 10-11 After the vertical rotating component 61 rotates, it drives the lead screw 64 to rotate, and the rotation of the lead screw 64 drives the cylinder slider 51 to move along the horizontal slide rail.

[0119] like Figure 12-13 A cutting fluid collection hole 72 is provided on the inclined surface 71; a cutting fluid collection cavity with an upper opening is provided on the lower part of the inclined surface 71 corresponding to the position of the gripping mechanism. 73 Due to the inclined surface 71 provided in this invention, the slope of the inclined surface 71 allows the cutting fluid to flow down the wall. When the cutting fluid flows down the wall, it is collected in conjunction with the cutting fluid collection hole 72. A filter screen (not shown in the figure) is also provided above the cutting fluid collection hole 72, which can filter out some metal debris.

[0120] like Figure 14 This is a flowchart of the thread rolling method of the present invention. The thread rolling method of the present invention adopts the following process steps: S1: adjustment → S2: gripping → S3: release → S4: thread rolling → S5: gripping again → S6: return to position.

Claims

1. A high-precision thread rolling machine, comprising a conveying mechanism (3), a grabbing mechanism, and a thread rolling mechanism, characterized in that: the grabbing mechanism comprises a grabbing fixed frame (5), a cylinder sliding block (51), a cylinder fixed frame (52), a fixed rod assembly, and a grabbing assembly; the grabbing fixed frame (5) comprises a vertical fixed frame and a horizontal sliding rail fixedly connected to the top of the vertical fixed frame; the horizontal sliding rail is arranged in a direction perpendicular to the movement of the conveying mechanism (3); the cylinder sliding block (51) moves along the horizontal sliding rail; the lower part of the cylinder sliding block (51) is fixedly connected to the cylinder fixed frame (52); the cylinder fixed frame (52) is provided with a cylinder fixedly arranged thereon; the cylinder drives the grabbing mechanism to vertically slide up and down; the fixed rod assembly is fixedly connected to the grabbing assembly at the lower end; the fixed rod assembly slides in the horizontal direction to make the grabbing assembly complete the grabbing of the motor shaft (1); the thread rolling mechanism comprises two groups of symmetrically arranged first thread rolling extrusion rollers (21) and second thread rolling extrusion rollers (22); after the motor shaft (1) is grabbed by the grabbing mechanism, the free end of the motor shaft (1) is placed between the two first thread rolling extrusion rollers (21) and the two second thread rolling extrusion rollers (22); the fixed rod assembly comprises a first fixed rod (53) and a second fixed rod (54); the grabbing assembly comprises a first grabbing part (55) and a second grabbing part (56); the bottom of the first fixed rod (53) is fixedly connected to the first grabbing part (55); the bottom of the second fixed rod (54) is fixedly connected to the second grabbing part (56); the number of the first fixed rod (53) is two; the two first fixed rods (53) and the second fixed rod (54) are arranged in a triangular shape; the two first fixed rods (53) move towards the second fixed rod (54) to complete the grabbing of the motor shaft (1) by cooperation of the two first grabbing parts (55) and the second grabbing part (56); the motor shaft (1) comprises a first protruding part (11), a second protruding part (12), a third protruding part (13), and a thread rolling part (14); the diameters of the first protruding part (11), the second protruding part (12), the third protruding part (13), and the thread rolling part (14) decrease in sequence; the number of the second protruding part (12), the third protruding part (13), and the thread rolling part (14) is two; they are symmetrically arranged along the axial direction with respect to the first protruding part (11); a first connecting part (11a) is arranged between the first protruding part (11) and the second protruding part (12); the first connecting part (11a) has a groove; the second grabbing part (56) is provided with a protruding block corresponding to the groove of the first connecting part (11a). ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ The inner side surface of the second grabbing part (56) is the same as the outer wall surface shape of the first protruding part (11), the second protruding part (12) and the first connecting part (11a), the second grabbing part (56) completely covers the first protruding part (11) and the first connecting part (11a) in the axial direction, and the second grabbing part (56) partially covers the second protruding part (12) in the axial direction; the second grabbing part (56) is symmetrically arranged relative to the center line (5d) of the rotating shaft; The second connecting part (12b) is provided between the second protruding part (12) and the third protruding part (13); the second connecting part (12b) has a groove; the first grabbing part (55) is provided with a protrusion corresponding to the groove of the second connecting part (12b); The inner side surface of the first grabbing part (55) is the same as the outer wall surface shape of the second protruding part (12), the third protruding part (13) and the second connecting part (12b), the first grabbing part (55) completely covers the second connecting part (12b) in the axial direction, and the first grabbing part (55) partially covers the second protruding part (12) and the third protruding part (13) in the axial direction; The two first grabbing parts (55) and the second grabbing part (56) are arranged in a triangular shape; the surfaces of the two first grabbing parts (55) and the second grabbing part (56) are provided with a grabbing buffer layer (59).

2. A high precision thread rolling machine as claimed in claim 1, wherein: The fixed rod assembly comprises a third fixed rod (57); the grabbing assembly comprises a third grabbing part (58); The number of the third fixed rod (57) is two, the two third fixed rods (57) are equal in size and symmetrically arranged left and right, the two third fixed rods (57) move towards each other, and the grabbing of the motor rotating shaft (1) is completed by the cooperation of the two third grabbing parts (58).

3. A high precision thread rolling machine as claimed in claim 2, wherein: The motor rotating shaft (1) comprises a first protruding part (11), a second protruding part (12), a third protruding part (13) and a thread rolling part (14); The diameters of the first protruding part (11), the second protruding part (12), the third protruding part (13) and the thread rolling part (14) decrease in turn; The second protruding part (12), the third protruding part (13) and the thread rolling part (14) are symmetrically arranged relative to the first protruding part (11) in the axial direction; The inner surface of the third grabbing part (58) forms a cavity corresponding to the free end of the thread rolling part (14), and the two third grabbing parts (58) complete the grabbing of the two thread rolling parts (14) through the cavity; The surfaces of the two third grabbing parts (58) are provided with a grabbing buffer layer (59).

4. The high-precision thread rolling machine according to claim 1, characterized in that: The conveying mechanism (3) comprises two parallel transmission belts, namely a first transmission belt (31) and a second transmission belt (32); the thread rolling mechanism further comprises a cutting fluid spraying pipe (23) arranged above the first thread rolling extrusion roller (21) and the second thread rolling extrusion roller (22); The surface of the first transmission belt (31) is provided with a falling buffer layer.

5. A high precision thread rolling machine as claimed in claim 4, wherein: The first conveying belt (31) is composed of inclined surfaces (71) arranged symmetrically along the central surface of the first conveying belt (31) in the conveying direction; The inclined surface (71) is provided with a cutting fluid collecting hole (72); the surface lower part of the inclined surface (71) is provided with an upper opening cutting fluid collecting cavity (73) corresponding to the position of the grabbing mechanism.

6. A high precision thread rolling machine as claimed in claim 1, wherein: The first thread rolling extrusion roller (21) and the second thread rolling extrusion roller (22) rotate in opposite directions.

7. A high precision thread rolling machine as claimed in claim 5 wherein: The first thread rolling extrusion roller (21) is connected with a first torque sensor; the second thread rolling extrusion roller (22) is rotatably connected with a second torque sensor; the cutting fluid spraying pipe (23) is provided with a solenoid valve on the pipeline; the first torque sensor, the second torque sensor and the solenoid valve are electrically connected with the controller (4).

8. A thread rolling method using a high-precision thread roller as claimed in claim 7, characterized in that: The method comprises the following steps: S1: debugging, the dust removal and debugging of the whole high-precision thread rolling machine are carried out, and all the equipment is ensured to be in normal working state; S2: grabbing, the motor shaft (1) is located on the second conveying belt (32), the vertical rotating assembly (61) is started, the cylinder sliding block (51) is adjusted to move along the horizontal sliding rail through the lead screw (64); when reaching above the motor shaft (1) to be grabbed, the cylinder is started to drive the grabbing mechanism to move downward; when reaching the same horizontal plane as the motor shaft (1), two third fixed rods (57) are moved towards each other, and the motor shaft (1) is grabbed through the cooperation of two third grabbing parts (58); after grabbing the motor shaft (1), the cylinder is retracted to lift the bearing; S3: releasing, the vertical rotating assembly (61) is started, the cylinder sliding block (51) is adjusted to move along the horizontal sliding rail through the lead screw (64); when reaching above the thread rolling mechanism to be grabbed, the cylinder is started to drive the grabbing mechanism to move downward, and the free end of the motor shaft (1) is placed between two first thread rolling extrusion rollers (21) and two second thread rolling extrusion rollers (22); when the motor shaft (1) reaches the predetermined position, the motor shaft (1) is released through the horizontal movement of two third grabbing parts (58); after releasing, the cylinder is started to drive the grabbing mechanism to move upward; S4: thread rolling, the first thread rolling extrusion roller (21) and the second thread rolling extrusion roller (22) are started, and the thread rolling of the motor shaft (1) is completed; after the thread rolling is completed, the rotation of the first thread rolling extrusion roller (21) and the second thread rolling extrusion roller (22) is stopped; S5: grabbing again, the cylinder is started to drive the grabbing mechanism to move downward until the grabbing mechanism reaches the same horizontal plane as the motor shaft (1); the motor shaft (1) is clamped through the horizontal movement of two third grabbing parts (58); the cylinder is started to drive the grabbing mechanism to move upward; S6: Homing, open vertical rotating assembly (61), adjust the cylinder slider (51) along the horizontal slide rail through the screw rod (64) until the surface of the first conveyor belt (31); start the cylinder to drive the grabbing mechanism to move downward, and complete the release of the motor shaft (1) by horizontally moving the two third grabbing parts (58) at a distance of 0.1-0.2m above the surface of the first conveyor belt (31); the motor shaft (1) falls onto the surface of the first conveyor belt (31).

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