A novel hard alloy cutter machining and grinding assembly and grinding device

Abstract

The application discloses a novel hard alloy cutter machining and grinding assembly and a grinding device, relates to the technical field of grinding devices, and comprises a mounting seat, a motor is fixedly installed at the bottom of the mounting seat, a main shaft driven by the motor is rotationally connected in the mounting seat, and a grinding wheel is arranged at one end of the main shaft; the overload protection structure comprises a coaxially fixed outer cylinder and an inner cylinder; after the grinding resistance borne by the grinding wheel is greater than the friction force between the friction block and the connecting cylinder, the connecting cylinder will slide relative to the friction block, buffering and unloading are carried out through the friction between the connecting cylinder and the friction block, the reverse conduction of the overload grinding torque to the motor and the main shaft is blocked, motor locked-rotor overload and damage of the main shaft caused by impact are prevented, meanwhile, the effective grinding torque of the grinding wheel under the slipping state is rapidly reduced, the workpiece cannot be continuously and rigidly extruded, and problems such as fragmentation of the grinding wheel, edge collapse of the workpiece and grinding burn are avoided.

Description

Technical Field

[0001] This invention relates to the field of grinding equipment technology, and in particular to a novel grinding assembly and grinding device for machining cemented carbide cutting tools. Background Technology

[0002] Carbide cutting tools are a type of cutting tool made of refractory metal carbides such as tungsten carbide and titanium carbide as the hard phase and metals such as cobalt or nickel as the binder phase. They are made into bar blanks by pressing and sintering using powder metallurgy methods, and then further processed by grinding to give them the final geometry and cutting edge characteristics.

[0003] Existing grinding equipment for machining carbide tools mainly consists of a fixture, a drive structure, a grinding wheel, and a cooling system. During operation, the fixture fixes the workpiece, and the drive structure controls the rotation and feed of the workpiece and the grinding wheel respectively, so that the grinding wheel grinds various grooves on the workpiece to realize the machining of carbide tools.

[0004] However, cemented carbide materials are characterized by high hardness, brittleness, and low thermal conductivity, making them typical difficult-to-machine materials. Grinding them involves high grinding forces and temperatures, leading to severe grinding wheel wear. In existing systems, the grinding wheel and spindle are often rigidly connected. When the grinding wheel feed rate is too high during machining, or when the outer diameter of the worn grinding wheel decreases at the same feed rate, resulting in insufficient grinding linear velocity, the instantaneous grinding resistance on the grinding wheel increases significantly. This can easily cause excessive compression and collision of the abrasive material, leading to breakage of the grinding wheel. In severe cases, it can even damage the spindle and burn out the electric spindle. Therefore, improvements to the existing systems are urgently needed. Summary of the Invention

[0005] The purpose of this invention is to address the problem in existing grinding devices where the grinding wheel and spindle are rigidly fixed, lacking an effective buffer and overload protection mechanism, and grinding resistance increases significantly when the grinding wheel is fed too fast, easily leading to abrasive breakage and even damage to the spindle and motor. Therefore, a novel cemented carbide tool machining grinding component and grinding device are proposed.

[0006] To achieve the above objectives, the present invention employs the following technology: a novel cemented carbide tool machining and grinding assembly, comprising a mounting base, a motor fixedly mounted on the bottom of the mounting base, a spindle driven by the motor being rotatably connected inside the mounting base, and a grinding wheel being provided at one end of the spindle; It also includes an overload protection structure, which includes an outer cylinder and an inner cylinder fixed coaxially. A connecting cylinder fixed to the grinding wheel is rotatably connected between the outer cylinder and the inner cylinder. A locking block embedded in the pin groove of the outer wall of the connecting cylinder is elastically connected inside the outer cylinder. A friction block is slidably connected inside the inner cylinder. A tension spring is fixed between the friction block and the inner wall of the inner cylinder. A speed sensor is installed on one side of the mounting base. A transmission protection structure is provided between the outer cylinder and the main shaft; When the spindle rotates stably, the grinding wheel is driven to rotate by the friction between the friction block and the inner wall of the connecting cylinder; when the grinding resistance on the grinding wheel is too large, the connecting cylinder and the friction block are buffered by sliding misalignment.

[0007] As a further description of the above technology: the transmission protection structure includes a connecting rod one fixed to one side of the connecting cylinder, a connecting rod two fixed to one side of the outer cylinder, and a transmission sleeve fixed to one end of the main shaft.

[0008] As a further description of the above technology: a transmission groove is provided on the outer side of the second connecting rod, and an insert fixed to the inner wall of the transmission sleeve is slidably connected inside the transmission groove.

[0009] As a further description of the above technology: the transmission sleeve is provided with a power storage unit and a triggering unit. The power storage unit includes a top rod hinged to the inner wall of the transmission sleeve. A torsion spring is provided at the hinge of the top rod. One end of the connecting rod is fixed with a tension spring. One end of the tension spring is rotatably connected to the transmission sleeve through a washer.

[0010] As a further description of the above technology: the triggering unit includes a turntable, a push block is fixed circumferentially on the outer side of the turntable, and a push rod is elastically connected to one end of the connecting rod two.

[0011] As a further description of the above technology: a brake disc is fixed on the side of the mounting base near the outer cylinder, and the distance between the outer cylinder and the brake disc is greater than the length of the transmission groove.

[0012] As a further description of the above technology, it also includes a control structure, which includes a spring telescopic rod fixedly installed inside the mounting base. One end of the spring telescopic rod is slidably connected to a connecting seat that is rotatably connected to the turntable. A support spring is provided between the connecting seat and the inner wall of the spring telescopic rod. An electromagnet is installed inside the spring telescopic rod, and a magnetic block is fixed inside the connecting seat.

[0013] Based on the above design, this application also provides a novel cemented carbide tool grinding device, including a grinding assembly and a machine body. A drive mechanism and a clamping mechanism are fixedly installed inside the machine body. The mounting base is fixed to the execution end of the drive mechanism. A cooling system is provided inside the machine body.

[0014] As a further description of the above technology: a material tray is fixed inside the machine body, and a robotic arm for loading and unloading materials is installed inside the machine body.

[0015] In summary, due to the adoption of the above-mentioned technology, the beneficial effects of this invention are as follows: 1. This invention utilizes the motor-driven spindle to stably rotate the outer and inner cylinders. The friction between the friction block and the connecting cylinder drives the grinding wheel to rotate stably, grinding the bar stock. When the grinding resistance on the grinding wheel exceeds the friction between the friction block and the connecting cylinder, the connecting cylinder slides relative to the friction block. This friction between the connecting cylinder and the friction block buffers and unloads the load, preventing the reverse transmission of overload grinding torque to the motor and spindle, thus preventing motor stalling and overload, and damage to the spindle from impact. Simultaneously, the effective grinding torque of the grinding wheel decreases rapidly during slippage, preventing continuous hard compression of the bar stock and avoiding problems such as grinding wheel breakage, workpiece chipping, and grinding burns.

[0016] 2. After the connecting cylinder and the outer cylinder rotate relative to each other, the power storage unit is triggered to release the transmission between the connecting rod and the transmission sleeve, and brakes the outer cylinder through the brake disc, which can quickly stop the grinding wheel, thereby promptly curbing the harm caused by the accident and protecting the safety of the cutting tool and the grinding wheel.

[0017] In addition, the power storage unit will also drive the grinding wheel to automatically retract, so that the grinding wheel and the bar stock are no longer in contact, completely eliminating the squeezing load between them, preventing chipping of the grinding groove of the tool, and reducing the scrap rate.

[0018] 3. This invention reduces the sensitivity of the transmission protection structure by increasing the distance between the push rod and the push rod, thus avoiding equipment shutdown caused by the instantaneous increase in grinding wheel resistance due to burrs during processing. Furthermore, by resetting the positional relationship between the push block and the push rod through the control structure, this invention prevents the accumulation of push block movement due to repeated occurrences of the above situation, thereby triggering the transmission protection structure. This further improves the stability of the device's operation and enhances its effectiveness. Attached Figure Description

[0019] Figure 1 An overall schematic diagram of the present invention is shown; Figure 2 A schematic diagram of the grinding wheel of the present invention is shown; Figure 3 A schematic diagram of the motor of the present invention is shown; Figure 4 A schematic diagram of the transmission protection structure of the present invention is shown; Figure 5 An exploded view of the overload protection structure of the present invention is shown; Figure 6 A schematic diagram of the connecting cylinder of the present invention is shown; Figure 7 A schematic cross-sectional view of the overload protection structure of the present invention is shown; Figure 8 A schematic diagram of the card block of the present invention is shown; Figure 9 A second schematic cross-sectional view of the overload protection structure of the present invention is shown; Figure 10 A schematic diagram of the energy storage unit of the present invention is shown; Figure 11 The present invention is shown. Figure 10 Enlarged view of point A in the middle; Figure 12 A schematic diagram of the pusher block of the present invention is shown.

[0020] Legend: 10. Machine body; 11. Drive mechanism; 12. Clamping mechanism; 13. Material tray; 14. Robotic arm; 15. Cooling system; 21. Mounting base; 22. Motor; 23. Spindle; 24. Grinding wheel; 25. Overload protection structure; 251. Outer cylinder; 252. Inner cylinder; 253. Friction block; 254. Tension spring one; 255. Clamping block; 256. Connecting cylinder; 26. Speed ​​sensor; 30. Transmission protection structure; 31. Connecting rod one; 32. Connecting rod two; 33. Transmission sleeve; 34. Power storage unit; 341. Push rod; 342. Torsion spring; 343. Tension spring two; 35. Triggering unit; 351. Turntable; 352. Push block; 353. Push rod; 36. Brake disc; 40. Control structure; 41. Spring telescopic rod; 42. Connecting seat; 43. Support spring; 44. Electromagnet; 45. Magnetic block. Detailed Implementation

[0021] The following will describe clearly and completely a novel cemented carbide tool grinding assembly and grinding device according to the embodiments of the present invention with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] like Figures 1-12 As shown, the present invention provides a novel cemented carbide tool grinding apparatus, comprising a body 10 and a grinding assembly. A drive mechanism 11 and a clamping mechanism 12 are fixedly installed inside the body 10. The drive mechanism 11 is used to adjust the spatial position and angle of the grinding assembly, while the clamping mechanism 12 is used to clamp and fix the cemented carbide bar, drive the bar to rotate, and adjust the position and angle of the bar in a plane. Through the cooperation of the drive mechanism 11 and the clamping mechanism 12, the grinding position and angle of the bar can be precisely controlled, thereby machining various grooves. The body 10 also has a cooling system 15 for cooling the grinding area.

[0023] The machine body 10 has a material tray 13 fixed inside for placing bar stock and finished cutting tools, and a robotic arm 14 for loading and unloading is installed inside the machine body 10. During processing, the robotic arm 14 can pick up bar stock from the material tray 13 and insert it into the clamping position of the clamping mechanism 12, and remove the finished cutting tools from the clamping mechanism 12 and insert them into the material tray 13, enabling the equipment to perform automated production.

[0024] Reference Figure 2 , Figure 3 and Figure 4 The grinding assembly includes a mounting base 21 fixed to the actuating end of the drive mechanism 11. A motor 22 is fixedly mounted on the bottom of the mounting base 21. A spindle 23 is rotatably connected inside the mounting base 21. The spindle 23 is connected to the drive shaft of the motor 22 via a belt and pulley. A grinding wheel 24 is provided at one end of the spindle 23.

[0025] When the equipment is running, the starter motor 22 drives the main shaft 23 to rotate via the belt and pulley, which in turn drives the grinding wheel 24 to rotate and grind the bar stock held by the clamping mechanism 12. The water outlet pipe of the cooling system 15 is fixed on the mounting base 21 and can move with the mounting base 21, so that the cooling water can always be sprayed onto the grinding position.

[0026] Reference Figures 4-9 Over time, wear and tear on the grinding wheel 24 will reduce its working outer diameter. At the same rotational speed, the linear velocity at the contact point between the edge of the grinding wheel 24 and the bar stock will decrease, leading to a reduction in grinding speed. If the grinding wheel 24 is still fed at the preset speed, the grinding resistance will significantly increase, not only exacerbating the temperature rise in the grinding zone and secondary wear of the grinding wheel 24, but also potentially causing the grinding wheel 24 to crush and break, as well as damage to the motor 22 and spindle 23. Furthermore, excessive feed speed of the grinding wheel 24 during equipment operation will also cause the same problems. Therefore, to improve the operational safety of the grinding equipment, an overload protection structure 25 is provided.

[0027] The overload protection structure 25 includes an outer cylinder 251 and an inner cylinder 252 that are coaxially fixed. A connecting cylinder 256 fixed to the grinding wheel 24 is rotatably connected between the outer cylinder 251 and the inner cylinder 252. The outer diameter of the connecting cylinder 256 is equal to the inner diameter of the outer cylinder 251. The inner wall of the connecting cylinder 256 is a friction surface. A locking block 255 is elastically connected inside the outer cylinder 251. A pin groove is opened on the outer wall of the connecting cylinder 256. The locking block 255 is embedded in the pin groove by the spring force. An inclined surface is provided on the side of the locking block 255 near the connecting cylinder 256. A friction block 253 is slidably connected inside the inner cylinder 252. A tension spring 254 is fixed between the friction block 253 and the inner wall of the inner cylinder 252. At least two friction blocks 253, tension spring 254, and locking blocks 255 are provided, and they are arranged equidistantly around the connecting cylinder 256. The outer cylinder 251 and the main shaft 23 are connected by a transmission protection structure 30, so the outer cylinder 251 can be driven to rotate by the motor 22.

[0028] During the start-up of the grinding device, the outer cylinder 251 and inner cylinder 252 drive the friction block 253, tension spring 254, and locking block 255 to rotate. The rotational speed of the outer cylinder 251 goes through three stages from small to large. In the first stage, the centrifugal force on the friction block 253 is insufficient to overcome the elastic force of the tension spring 254, and the friction block 253 remains stationary relative to the outer cylinder 251 and inner cylinder 252; the centrifugal force on the locking block 255 is insufficient to overcome the elastic force of the spring connected to it, and the locking block 255 will not disengage from the pin groove of the connecting cylinder 256. In this stage, the outer cylinder 251 drives the connecting cylinder 256 to rotate through the locking block 255, thereby driving the grinding wheel 24 to start rotating.

[0029] Second stage: Under the action of centrifugal force, friction block 253 overcomes the elastic force of tension spring 254, causing tension spring 254 to be stretched, and friction block 253 slides along the radial direction of outer cylinder 251 until it contacts the friction surface of inner wall of connecting cylinder 256; the centrifugal force on the locking block 255 is still insufficient to overcome the spring force.

[0030] In the third stage, the rotational speed of the outer cylinder 251 increases to the maximum and remains constant. The centrifugal force on the locking block 255 is greater than the spring force, which compresses the spring, and the locking block 255 is dislodged from the pin groove. Under the action of centrifugal force, there is sufficient pressure between the friction block 253 and the inner wall of the connecting cylinder 256, so that the outer cylinder 251 and the inner cylinder 252 can drive the grinding wheel 24 to rotate stably through the friction between the friction block 253 and the connecting cylinder 256.

[0031] Through the above design, when the motor 22 drives the spindle 23 to rotate the outer cylinder 251 and inner cylinder 252 stably, the friction between the friction block 253 and the connecting cylinder 256 drives the grinding wheel 24 to rotate stably and grind the bar stock. When the grinding resistance on the grinding wheel 24 exceeds the friction between the friction block 253 and the connecting cylinder 256, the connecting cylinder 256 will slide relative to the friction block 253. The friction between the connecting cylinder 256 and the friction block 253 buffers and unloads the load, preventing the overload grinding torque from being transmitted back to the motor 22 and the spindle 23, thus preventing the motor 22 from stalling and overloaded, and preventing the spindle 23 from being damaged by impact. At the same time, the effective grinding torque of the grinding wheel 24 decreases rapidly in the slipping state, preventing continuous hard compression of the bar stock and avoiding problems such as grinding wheel 24 breakage, workpiece chipping, and grinding burns.

[0032] A speed sensor 26 is installed on one side of the mounting base 21 to detect the rotational speed of the connecting cylinder 256 and the outer cylinder 251 respectively. When the connecting cylinder 256 slides relative to the friction block 253, the speed sensor 26 detects that the rotational speeds of the connecting cylinder 256 and the outer cylinder 251 are out of sync, and determines that the frictional resistance of the grinding wheel 24 is overloaded. Thus, the feed speed of the grinding wheel 24 can be reduced in time by manual operation or programmable logic controller (PLC), or the motor 22 can be stopped to troubleshoot problems in the processing process and effectively improve the operational safety of the equipment.

[0033] Similarly, when there is no relative sliding between the connecting cylinder 256 and the friction block 253, during the deceleration of the outer cylinder 251 after the equipment stops, as the centrifugal force on the locking block 255 and the friction block 253 decreases, the spring force drives the locking block 255 to reset and re-embed into the pin groove of the connecting cylinder 256, and the friction block 253 is pulled back and reset by the tension spring 254. If there has been relative sliding between the connecting cylinder 256 and the friction block 253, after the friction block 253 loses contact with the connecting cylinder 256 during the deceleration of the outer cylinder 251, under the action of inertial force and the friction force on the external structure of the connection, the connecting cylinder 256 is difficult to keep synchronously rotating with the outer cylinder 251. Therefore, the connecting cylinder 256 and the outer cylinder 251 will rotate relative to each other, causing the locking block 255 to realign with the pin groove of the connecting cylinder 256 and be pushed into the pin groove by the spring, so that the equipment can be quickly put back into use.

[0034] Reference Figure 4 The transmission protection structure 30 includes a connecting rod 31 fixed to one side of the connecting cylinder 256, a connecting rod 32 through which the connecting rod 31 passes on one side of the outer cylinder 251, a transmission sleeve 33 fixed to one end of the main shaft 23, a transmission groove on the outer side of the connecting rod 32, and an insert fixed to the inner wall of the transmission sleeve 33 slidably connected inside the transmission groove. When the main shaft 23 drives the transmission sleeve 33 to rotate, the connecting rod 32 rotates through the insert, thereby driving the outer cylinder 251 and the inner cylinder 252 to rotate.

[0035] Reference Figure 10 and Figure 11 The transmission sleeve 33 is internally equipped with a power storage unit 34 and a triggering unit 35. The power storage unit 34 includes four push rods 341 hinged to the inner wall of the transmission sleeve 33. These push rods 341 are arranged equidistantly around the axis of the transmission sleeve 33. A steel ball is embedded at the end of the push rod 341 away from the hinge, and the steel ball abuts against the connecting rod 32. A torsion spring 342 is provided at the hinge of the push rod 341. The torsion spring 342 is always in a tightened state. Under the elastic force of the torsion spring 342 and the limitation of the limiting groove of the transmission sleeve 33, the push rod 341 maintains a parallel posture. A tension spring 343 is fixed at the end of the connecting rod 32 near the transmission sleeve 33. A washer fixed to the other end of the tension spring 343 is rotatably connected to the inner wall of the transmission sleeve 33. The tension spring 343 is in a stretched state.

[0036] The triggering unit 35 includes a turntable 351, on the outer circumference of which four push blocks 352 are fixedly arranged at equal intervals. One end of the connecting rod 32 is elastically connected to four push rods 353 that are respectively aligned with each push rod 341.

[0037] Since connecting rod 31 and connecting rod 32 are fixed to connecting cylinder 256 and outer cylinder 251 respectively, when connecting cylinder 256 and outer cylinder 251 rotate relative to each other, connecting rod 31 and connecting rod 32 will find a rotational misalignment. Connecting rod 31 will drive the turntable 351 to rotate, causing push block 352 to push push rod 353 through the inclined plane. This push rod 353 will overcome the spring force and move towards the top rod 341 until it pushes the top rod 341 to no longer support connecting rod 32. At this time, tension spring 343 will contract, causing connecting rod 32, outer cylinder 251, inner cylinder 252, connecting cylinder 256, and connecting rod 31 to move axially, causing the insert to disengage from the transmission groove. The transmission sleeve 33 will no longer drive connecting rod 32 to rotate. This design can automatically stop the grinding wheel 24 when the grinding torque it receives is too large, greatly reducing the grinding pressure on the grinding wheel 24, preventing the edge of the grinding wheel 24 from breaking, and extending the service life of the grinding wheel 24.

[0038] A brake disc 36 is fixed to the side of the mounting base 21 near the outer cylinder 251. The distance between the outer cylinder 251 and the brake disc 36 is greater than the length of the transmission groove. After the outer cylinder 251 moves axially to contact the brake disc 36, the connecting rod 32 moves axially a certain distance relative to the outer cylinder 251. This distance is equal to the distance between the outer cylinder 251 and the brake disc 36, so that the distance the insert moves axially relative to the connecting rod 32 is greater than the length of the transmission groove. Therefore, when the outer cylinder 251 contacts the brake disc 36, the insert has completely disengaged from the transmission groove. At this time, the tension spring 343 is still in a stretched state, creating a certain pressure between the outer cylinder 251 and the brake disc 36. This design can brake the outer cylinder 251 through the friction between the brake disc 36 and the outer cylinder 251, causing the grinding wheel 24 to stop quickly. At the same time, it releases the transmission between the main shaft 23, the transmission sleeve 33, and the connecting rod 32, further improving equipment safety.

[0039] In addition, when the connecting cylinder 256 moves axially, it can drive the grinding wheel 24 to move together, so that when the grinding resistance of the grinding wheel 24 is overloaded, it will automatically retract and disengage from the bar stock, completely eliminating the extrusion load between the two, preventing chipping of the tool grinding groove, and reducing the scrap rate.

[0040] When there are protruding burrs on the surface of the bar stock, the moment the outer circumference of the grinding wheel 24 cuts into the bar, the abrasive grains cut the protruding part in one go, causing a sudden surge in load. This causes misalignment between the connecting cylinder 256 and the outer cylinder 251. After the burrs are quickly removed, the resistance immediately drops. This condition is a common occurrence in the machining process. To prevent this condition from triggering the transmission protection structure 30, a gap is provided between the push rod 353 and the top rod 341. When there is a slight misalignment between the first connecting rod 31 and the second connecting rod 32, the turntable 351 deflects at a small angle, which is insufficient to push the push rod 353 to overcome the spring force and move a long distance to push the top rod 341, thereby preventing the transmission protection structure 30 from being accidentally triggered.

[0041] However, considering that repeated misalignments between the connecting cylinder 256 and the outer cylinder 251 will still trigger the transmission protection structure 30 after multiple occurrences of the above situation, a control structure 40 is provided for this purpose, as shown in the reference. Figure 11 The control structure 40 includes a spring telescopic rod 41 fixedly installed inside the mounting base 21. One end of the spring telescopic rod 41 is slidably connected to a connecting seat 42 that is rotatably connected to the turntable 351. A support spring 43 is provided between the connecting seat 42 and the inner wall of the spring telescopic rod 41. The elastic force of the spring in the spring telescopic rod 41 is much greater than the elastic force of the support spring 43. An electromagnet 44 is installed inside the spring telescopic rod 41, and a magnetic block 45 is fixed inside the connecting seat 42.

[0042] When the electromagnet 44 is energized, it generates a magnetic repulsive force that pushes the magnetic block 45, causing the connecting seat 42 and the turntable 351 to move axially, making the friction surface of the turntable 351 in close contact with the end face of the connecting rod 31. In this state, the rotation of the connecting rod 31 can drive the turntable 351 to rotate through friction, thereby triggering the power storage unit 34 and stopping the grinding wheel 24 from rotating.

[0043] When the speed sensor 26 detects a small instantaneous difference in speed between the connecting cylinder 256 and the outer cylinder 251, the PLC controls the electromagnet 44 to briefly de-energize, causing the support spring 43 to drive the connecting seat 42 and the turntable 351 to reset. The connecting rod 31 separates from the turntable 351. At this time, the spring drives the push rod 353 to reset and press the inner wall of the push block 352, which will cause the turntable 351 to deflect and reset, resetting the positional relationship between the push block 352 and the push rod 353. When the electromagnet 44 is energized again, the contact between the turntable 351 and the connecting rod 31 can be restored.

[0044] Through the above design, the present invention can avoid the equipment shutdown caused by the instantaneous increase in resistance of the grinding wheel 24 due to burrs during the processing. Furthermore, the control structure 40 can reset the positional relationship between the push block 352 and the push rod 353, preventing the accumulation of motion of the push block 352 due to repeated occurrences of the above situation, thereby triggering the transmission protection structure 30. This further improves the stability of the device's operation and enhances its performance.

[0045] In this invention, by limiting the weight of the push rod 341 and the push rod 353, the centrifugal force they experience during their circumferential rotation can be significantly reduced, making the centrifugal force they experience much smaller than the elastic force of the spring and torsion spring 342, thereby minimizing the impact of centrifugal force on the movement of the push rod 341 and the push rod 353.

[0046] After the transmission protection structure 30 is triggered, causing the grinding wheel 24 to retract, the equipment needs to be stopped for maintenance. After manually aligning the insert with the transmission groove, the overload protection structure 25 is pulled by external force to re-enter the transmission groove. The tension spring 343 is stretched, and the torsion spring 342 drives the top rod 341 to deflect and reset the supporting connecting rod 32, completing the reset of all components. The spring force of the spring telescopic rod 41 is much smaller than the elastic coefficient of the tension spring 343. After the connecting rod 32 moves axially, it will compress the spring telescopic rod 41, and the spring telescopic rod 41 will not hinder the movement of the connecting rod 32.

[0047] Working principle: When machining carbide tools, the carbide bar is fixed by the clamping mechanism 12 and the angle of the bar is adjusted. The position and angle of the grinding wheel 24 are adjusted by the drive mechanism 11 so that the grinding wheel 24 can grind at the designated position of the bar and open the tool groove.

[0048] The starting motor 22 drives the main shaft 23 to rotate via belt and pulley. The main shaft 23 drives the connecting rod 32 to rotate via insert, thereby driving the outer cylinder 251 and inner cylinder 252 to rotate. The friction between the friction block 253 and the connecting cylinder 256 drives the grinding wheel 24 to rotate and perform grinding on the bar stock.

[0049] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitution or modification made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the present invention's technology and the inventive concept of a novel cemented carbide tool machining grinding assembly and grinding device, should be covered within the scope of protection of the present invention.

Claims

1. A novel cemented carbide tool machining and grinding assembly, characterized in that, Includes a mounting base (21), on the bottom of which a motor (22) is fixedly mounted, and inside the mounting base (21) is a spindle (23) driven by the motor (22) rotatably connected, and one end of the spindle (23) is provided with a grinding wheel (24). It also includes an overload protection structure (25), which includes an outer cylinder (251) and an inner cylinder (252) fixed coaxially. A connecting cylinder (256) fixed to a grinding wheel (24) is rotatably connected between the outer cylinder (251) and the inner cylinder (252). A locking block (255) embedded in the pin groove of the outer wall of the connecting cylinder (256) is elastically connected inside the outer cylinder (251). A friction block (253) is slidably connected inside the inner cylinder (252). A tension spring (254) is fixed between the friction block (253) and the inner wall of the inner cylinder (252). A speed sensor (26) is installed on one side of the mounting base (21). A transmission protection structure (30) is provided between the outer cylinder (251) and the main shaft (23). When the spindle (23) rotates stably, the friction between the friction block (253) and the inner wall of the connecting cylinder (256) drives the grinding wheel (24) to rotate; when the grinding resistance of the grinding wheel (24) is too large, the connecting cylinder (256) and the friction block (253) are buffered by sliding misalignment.

2. The novel cemented carbide tool machining and grinding assembly according to claim 1, characterized in that, The transmission protection structure (30) includes a connecting rod one (31) fixed to one side of the connecting cylinder (256), a connecting rod two (32) fixed to one side of the outer cylinder (251), and a transmission sleeve (33) fixed to one end of the main shaft (23).

3. The novel cemented carbide tool machining and grinding assembly according to claim 2, characterized in that, The outer side of the connecting rod 2 (32) is provided with a transmission groove, and the inside of the transmission groove is slidably connected with an insert fixed to the inner wall of the transmission sleeve (33).

4. The novel cemented carbide tool machining and grinding assembly according to claim 2, characterized in that, The transmission sleeve (33) is provided with a power storage unit (34) and a triggering unit (35). The power storage unit (34) includes a top rod (341) hinged to the inner wall of the transmission sleeve (33). A torsion spring (342) is provided at the hinge of the top rod (341). One end of the connecting rod (32) is fixed with a tension spring (343). One end of the tension spring (343) is rotatably connected to the transmission sleeve (33) through a washer.

5. A novel cemented carbide tool machining and grinding assembly according to claim 4, characterized in that, The triggering unit (35) includes a turntable (351), a push block (352) is fixed circumferentially on the outer side of the turntable (351), and a push rod (353) is elastically connected to one end of the connecting rod (32).

6. A novel cemented carbide tool machining and grinding assembly according to claim 3, characterized in that, The mounting base (21) has a brake disc (36) fixed on the side near the outer cylinder (251), and the distance between the outer cylinder (251) and the brake disc (36) is greater than the length of the transmission groove.

7. A novel cemented carbide tool machining and grinding assembly according to claim 5, characterized in that, It also includes a control structure (40), which includes a spring telescopic rod (41) fixedly installed inside the mounting base (21). One end of the spring telescopic rod (41) is slidably connected to a connecting seat (42) that is rotatably connected to the turntable (351). A support spring (43) is provided between the connecting seat (42) and the inner wall of the spring telescopic rod (41). An electromagnet (44) is installed inside the spring telescopic rod (41), and a magnetic block (45) is fixed inside the connecting seat (42).

8. A novel grinding apparatus for machining cemented carbide cutting tools, characterized in that, The invention includes a grinding assembly as described in any one of claims 1-7, and a body (10), wherein a drive mechanism (11) and a clamping mechanism (12) are fixedly installed inside the body (10), the mounting base (21) is fixed to the actuating end of the drive mechanism (11), and a cooling system (15) is provided inside the body (10).

9. A novel cemented carbide tool grinding apparatus according to claim 8, characterized in that, The machine body (10) has a material tray (13) fixed inside, and a robotic arm (14) for loading and unloading materials is installed inside the machine body (10).

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