A workpiece self-rotation drive system for precision grinding

Abstract

A workpiece self-rotation drive system for precision grinding, comprising a drive mechanism, an oil cylinder mechanism and an auxiliary support mechanism connected in sequence. The oil cylinder mechanism consists of an upper pressing oil cylinder mechanism and a lower support oil cylinder mechanism. The drive mechanism includes a servo motor, a power divider box, a telescopic universal joint, a pressure wheel unit and a shafting connected in sequence. The pressure wheel unit includes an upper pressure wheel unit and a lower pressure wheel unit. The upper pressure wheel unit is connected to the upper pressing oil cylinder mechanism, and the lower pressure wheel unit is connected to the lower support oil cylinder mechanism. The upper pressure wheel unit and the lower pressure wheel unit are connected to the auxiliary support mechanism through a rocker arm. Bevel gear pairs are provided at the front ends of the upper pressure wheel unit and the lower pressure wheel unit, and an upper pressure wheel and a lower pressure wheel are provided at the rear ends of the upper pressure wheel unit and the lower pressure wheel unit. Rubber layers are provided on the outer edges of the upper pressure wheel and the lower pressure wheel. By using the present invention, precise adjustment of the position of the driving working surface of the workpiece in the front and rear directions can be achieved, and the self-rotation accuracy of the workpiece can be ensured.

Description

Technical Field

[0001] The present invention relates to a drive system, and more particularly to a workpiece self-rotation drive system for precision grinding. Background Art

[0002] Precision grinding mainly relies on the fine dressing of the grinding wheel. A diamond dressing tool is used for extremely small and uniform micro-feeds (10 - 15 mm / min). The grinding marks on the machined surface are very fine, and finally sparkless grinding is adopted. Due to the combined effects of micro-cutting, sliding extrusion, and friction, low surface roughness and high-precision requirements are achieved. Precision grinding mainly relies on the accuracy of precision grinding machines.

[0003] The brake disc is a key and vulnerable part of the motorcycle braking and braking system. Its material is heat-treated stainless steel (hard and tough, difficult to machine). The diameter-thickness ratio is generally 45 - 60. The larger this value, the better the braking effect and the higher the processing requirements. The outer edge part of a typical motorcycle brake disc is the working surface (with heat dissipation holes distributed), which requires low roughness, high flatness, and parallelism. The middle part is the support and installation structure. The two working surfaces of the brake disc must be processed by precision grinding to meet the service performance requirements.

[0004] A typical motorcycle brake disc has a diameter of φ190 - φ350 mm and a thickness of 3.5 - 6 mm. For high-performance motorcycles, the roughness of the brake disc is required to be ≤Ra1.6, the thickness difference in the same circumferential and radial directions is ≤0.01 mm, and the parallelism of the two working surfaces is ≤0.05 mm.

[0005] The motorcycle brake disc adopts a process route combining stamping and machining. When grinding the end face, due to the large diameter-thickness ratio, warping is likely to occur during processing, so the processing efficiency is low. At present, for the grinding of motorcycle brake discs, general grinding equipment such as surface grinders is generally used, and special fixtures are made to clamp one or more workpieces at a time for grinding.

[0006] The existing motorcycle brake disc processing technology has the following problems: 1. Difficult fixture manufacturing and low clamping efficiency; 2. During mass grinding, due to the inconsistency of the precision of materials in different batches, it is necessary to adjust the clamping precision of the fixture at any time, which is time-consuming and laborious and prone to unqualified products; 3. Loading, unloading, and grinding operations all rely on manual labor, with high operation difficulty and low processing efficiency. Summary of the Invention

[0007] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a workpiece self-rotation drive system for precision grinding with accurate positioning and high processing precision.

[0008] The technical solution adopted by the present invention to solve its technical problems is a workpiece self-rotation drive system for precision grinding, which includes a drive mechanism, an oil cylinder mechanism, and an auxiliary support mechanism connected in sequence. The oil cylinder mechanism is composed of an upper pressing oil cylinder mechanism and a lower supporting oil cylinder mechanism;

[0009] The drive mechanism includes a servo motor, a power take-off box, a telescopic universal joint, a pressure wheel unit, and a shafting connected in sequence. The pressure wheel unit includes an upper pressure wheel unit and a lower pressure wheel unit. The upper pressure wheel unit is connected to the upper pressing oil cylinder mechanism, and the lower pressure wheel unit is connected to the lower supporting oil cylinder mechanism. The upper pressure wheel unit and the lower pressure wheel unit are connected to the auxiliary support mechanism through a rocker arm. Bevel gear pairs are provided at the front ends of the upper pressure wheel unit and the lower pressure wheel unit, and upper pressure wheels and lower pressure wheels are provided at the rear ends of the upper pressure wheel unit and the lower pressure wheel unit. Rubber layers are provided on the outer edges of the upper pressure wheel and the lower pressure wheel;

[0010] The upper pressing oil cylinder mechanism includes a mounting seat, a guide key, a mounting plate, a ball head clamping oil cylinder, a pressing oil cylinder, and a front hinge connecting plate and a rear hinge connecting plate. The ball head clamping oil cylinder is connected to the mounting seat through the mounting plate and the guide key, and the mounting seat is connected to the main body box of the machine tool. The upper end of the pressing oil cylinder is connected to the ball head clamping oil cylinder through a ball head, and the lower end is connected to the upper pressure wheel unit through the front hinge connecting plate and the rear hinge connecting plate, for providing the pressing force of the upper pressure wheel on the workpiece;

[0011] The lower supporting oil cylinder mechanism includes a hydraulic oil cylinder and a position fine-tuning unit nested inside the cylinder piston;

[0012] The auxiliary support mechanism includes a servo motor, a lead screw shafting, a linear bearing assembly, and a rocker arm unit connected in sequence.

[0013] Further, the ball head clamping oil cylinder includes a cylinder body, a piston rod, a ball head clamping plate, and a guide plate. The pressing oil cylinder includes a ball head, an upper gland, a cylinder body, a pull rod, a lower gland, a piston rod, and a hinge shaft. The piston rod of the ball head clamping oil cylinder is connected to the ball head clamping plate, and the ball head clamping plate moves between a pair of guide plates fixed on the cylinder body. The simultaneous action of a pair of ball head clamping oil cylinders can realize the opening and closing of the ball head clamping plate; the ball head at the upper end of the pressing oil cylinder is located inside the space formed by a pair of ball head clamping plates, and the center height of the ball head remains fixed; the hinge shaft at the lower end of the pressing oil cylinder is fixedly connected to the piston rod, and at the same time, the hinge shaft is connected to the front hinge connecting plate and the rear hinge connecting plate, and the front hinge connecting plate and the rear hinge connecting plate can rotate along the hinge shaft.

[0014] Further, the hydraulic oil cylinder includes a cylinder body, an upper gland, a lower gland, a piston rod, and a joint. The stroke of the piston rod is a fixed value, and the cylinder body is fixedly installed on the feeding table and does not move;

[0015] The position fine-tuning unit includes a servo motor, a speed reducer, a speed reducer mounting seat, a coupling, a lead screw shaft system, a piston connecting sleeve, a piston extension rod, a positioning block, and a connecting plate. The servo motor, the speed reducer, the coupling, and the lead screw shaft system are fixedly connected through the speed reducer mounting seat and the piston connecting sleeve to the piston rod. The piston extension rod is located inside the piston rod, and there is a clearance fit between the piston extension rod and the piston rod. A flat key is provided on the outer wall of the piston extension rod, and a groove is provided in the inner hole of the piston rod corresponding to the position of the flat key. The piston extension rod is provided with a transmission threaded hole that cooperates with the lead screw. When the servo motor drives the lead screw to rotate through the speed reducer, the piston extension rod can perform a linear movement relative to the piston rod under the action of the flat key.

[0016] Further, the connecting plate is fixedly connected to the lower pressing wheel unit, and there is a rigid contact and no fixed connection between the connecting plate and the positioning block.

[0017] Further, the rocker arm unit includes a rocker arm fixing seat, a support shaft system, and a rocker arm.

[0018] Further, the rocker arm is provided with a waist-shaped hole, so that the positions of the upper pressing wheel and the lower pressing wheel in the left-right direction are adjustable.

[0019] The present invention has the following positive effects: The self-rotation of the workpiece is driven by friction. The rubber layers on the outer edges of the upper pressing wheel and the lower pressing wheel are in contact with the upper and lower surfaces of the workpiece and rotate synchronously in the opposite direction to drive the workpiece to rotate. Since the acting surface for driving the workpiece to rotate is also the processing surface of the workpiece, and there are many types of workpieces with inconsistent external dimensions, the servo motor of the auxiliary support mechanism can accurately adjust the position of the driving acting surface of the workpiece in the front-rear direction;

[0020] The relative position of the pressing wheel with respect to the workpiece can be adjusted in the left-right direction through the rocker arm. The contact positions of the upper pressing wheel and the lower pressing wheel with the workpiece surface are on the symmetry axis of the workpiece, which can ensure the self-rotation accuracy of the workpiece. Moreover, once adjusted during assembly, it remains fixed and is not affected by changing the types of workpieces during processing. Description of the Drawings

[0021] Figure 1 is a schematic structural diagram (front view) of an embodiment of the present invention;

[0022] Figure 2 is a schematic structural diagram (top view) of an embodiment of the present invention;

[0023] Figure 3 is Figure 1 a schematic structural diagram of the driving mechanism in

[0024] Figure 4 is Figure 3 a cross-sectional view of the end structure of the driving mechanism in

[0025] Figure 5 is Figure 1Schematic diagram of the lower support oil cylinder in

[0026] Figure 6 is Figure 1 Schematic diagram of the upper pressing oil cylinder in

[0027] Figure 7 is Figure 6 Side view of

[0028] Figure 8 is Figure 1 Front view of the auxiliary support mechanism in

[0029] Figure 9 is Figure 1 Top view of the auxiliary support mechanism in

[0030] In the figure: 1 driving mechanism, 1-1 upper pressing wheel unit, 1-11 upper pressing wheel, 1-2 lower pressing wheel unit, 1-21 lower pressing wheel, 1-3 rocker arm, 1-4 servo motor, 1-5 transfer box, 1-6 telescopic universal joint, 1-7 bevel gear pair, 2 upper pressing oil cylinder mechanism, 2-1 mounting seat, 2-2 guiding key, 2-3 mounting plate, 2-4 ball head clamping oil cylinder, 2-41 cylinder block, 2-42 piston rod, 2-43 ball head clamping plate, 2-44 guiding plate, 2-5 pressing oil cylinder, 2-51 ball head, 2-52 upper pressing cover, 2-53 cylinder block, 2-54 pull rod, 2-55 lower pressing cover, 2-56 piston rod, 2-57 hinge shaft, 2-6 front hinge connecting plate, 2-7 rear hinge connecting plate, 3 lower support oil cylinder mechanism, 3-1 hydraulic oil cylinder, 3-11 cylinder block, 3-12 upper pressing cover, 3-13 lower pressing cover, 3-14 piston rod, 3-15 joint, 3-2 oil cylinder piston, 3-3 position fine-tuning unit, 3-31 servo motor, 3-32 reducer, 3-33 reducer mounting seat, 3-34 coupling, 3-35 lead screw shaft system, 3-36 piston connecting sleeve, 4-37 piston extension rod, 3-38 positioning block, 3-39 connecting plate, 4 auxiliary support mechanism, 4-1 servo motor, 4-2 lead screw shaft system, 4-3 linear bearing assembly, 4-4 mounting plate, 4-5 rocker arm unit, 4-51 rocker arm fixing seat, 4-52 support shaft system. Detailed implementation mode

[0031] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0032] Referring to the attached Figure 1-9 , this embodiment includes a driving mechanism 1, an oil cylinder mechanism, and an auxiliary support mechanism 4 that are connected in sequence. The oil cylinder mechanism consists of an upper pressing oil cylinder mechanism 2 and a lower support oil cylinder mechanism 3.

[0033] The driving mechanism 1 includes a servo motor 1-4, a power take-off box 1-5, a telescopic universal joint 1-6, a pressure wheel unit and a shafting which are connected in sequence. The pressure wheel unit includes an upper pressure wheel unit 1-1 and a lower pressure wheel unit 1-2. The upper pressure wheel unit 1-1 is connected to the upper pressing oil cylinder mechanism 2, and the lower pressure wheel unit 1-2 is connected to the lower supporting oil cylinder mechanism 3. The upper pressure wheel unit 1-1 and the lower pressure wheel unit 1-2 are connected to the auxiliary supporting mechanism 4 through a rocker arm 1-3, which ensures the rigidity and stability of the system structure. At the same time, it can realize the function of adjusting the position of the driving surface of the workpiece to adapt to different workpiece sizes. A pair of bevel gear pairs 1-7 are obliquely installed at the front ends of the upper pressure wheel unit 1-1 and the lower pressure wheel unit 1-2.

[0034] The upper pressure wheel unit 1-1 is provided with an upper pressure wheel 1-11, and the lower pressure wheel unit 1-2 is provided with a lower pressure wheel 1-21. Rubber layers are provided on the outer edges of the upper pressure wheel 1-11 and the lower pressure wheel 1-21.

[0035] The power take-off box 1-5 is respectively connected to the upper pressure wheel unit 1-1 and the lower pressure wheel unit 1-2 through two telescopic universal joints 1-6, ensuring that the upper pressure wheel 1-11 and the lower pressure wheel 1-2 can rotate synchronously and reversely. The upper pressure wheel 1-11 and the lower pressure wheel 1-21 are obliquely installed at the end of the driving mechanism 1 (the workpiece is located between the two pressure wheels). The side generatrices of the upper pressure wheel 1-11 and the lower pressure wheel 1-21 near the workpiece are parallel and coplanar with the upper and lower surfaces of the workpiece respectively.

[0036] During operation, the upper pressing oil cylinder mechanism 2 and the lower supporting oil cylinder mechanism 3 drive the upper pressure wheel unit 1-1 and the lower pressure wheel unit 1-2 to move in the same direction and clamp the workpiece simultaneously. The outer edges of the upper pressure wheel 1-11 and the lower pressure wheel 1-21 are rubber material layers, which deform and generate frictional force after contacting the workpiece. The servo motor 1-4 of the driving mechanism 1 drives the upper pressure wheel unit 1-1 and the lower pressure wheel unit 1-2 to rotate through the power take-off box 1-5 and the telescopic universal joint 1-6, and the workpiece rotates self-driven by the frictional force of the upper pressure wheel 1-11 and the lower pressure wheel 1-21.

[0037] When replacing the workpiece and adjusting the position of the driving surface of the pressure wheel, the telescopic universal joint 1-6 and the auxiliary supporting mechanism 4 can be used to move the pressure wheel unit (and the upper pressing oil cylinder) back and forth, while the servo motor 1-4, the power take-off box 1-5 and the lower supporting oil cylinder mechanism 3 of the driving mechanism 1 all remain fixed.

[0038] The lower supporting oil cylinder mechanism 3 includes a hydraulic cylinder 3-1 and a position fine-tuning unit 3-3 nested inside the cylinder piston 3-2. The hydraulic cylinder 3-1 is composed of a cylinder block 3-11, an upper gland 3-12, a lower gland 3-13, a piston rod 3-14, a joint 3-15, etc. The stroke of the piston rod 3-14 is a fixed value, and the cylinder block 3-11 is installed on the feeding table (not shown in the figure) and remains fixed.

[0039] The position fine-tuning unit 3-3 consists of a servo motor 3-31, a speed reducer 3-32, a speed reducer mounting seat 3-33, a coupling 3-34, a lead screw shaft system 3-35, a piston connecting sleeve 3-36, a piston extension rod 3-37, a positioning block 3-38, a connecting plate 3-39, etc.

[0040] The connecting plate 3-39 is fixedly connected to the lower pressing wheel unit 1-2. There is a rigid contact but no fixed connection between the connecting plate 3-39 and the positioning block 3-38. When replacing the workpiece and adjusting the position of the driving surface of the lower pressing wheel, the connecting plate 3-39 (and the lower pressing wheel 1-21) can move vertically relative to the positioning block 3-38 (and the hydraulic cylinder 3-1 and the position fine-tuning unit 3-3). When the hydraulic cylinder 3-1 works, the lower pressing wheel unit 1-2 moves up and down in the vertical direction. Since the left side of the lower pressing wheel unit 1-2 is fixedly connected to the auxiliary support mechanism 4 through a rocker arm 1-3, the lower pressing wheel unit 1-2 rotates around the rocker arm 1-3 axis in the vertical direction, that is, there is also a left-right movement between the lower pressing wheel unit 1-2 through the connecting plate 3-39 and the positioning block 3-38. The left side of the lower pressing wheel 1-21 is a telescopic universal joint 1-6, and the telescopic universal joint 1-6 can automatically adjust the position when the lower pressing wheel unit 1-2 moves. When replacing the workpiece variety and changing the position of the driving surface of the pressing wheel, the lower pressing wheel unit 1-2 and the connecting plate 3-39 can move back and forth along the positioning block.

[0041] The servo motor 3-31, the speed reducer 3-32, the coupling 3-34 and the lead screw shaft system 3-35 of the position fine-tuning unit 3-3 are fixedly connected to the piston 3-14 through the speed reducer mounting seat 3-33, the piston connecting sleeve 3-36. The piston extension rod 3-37 is located inside the piston rod 3-14. There is a clearance fit between the piston extension rod 3-37 and the piston rod 3-14. A flat key is designed on the outer wall of the piston extension rod 3-37, and a groove is designed at the position corresponding to the flat key in the inner hole of the piston rod 3-14. The piston extension rod 3-37 is designed with a transmission thread hole to cooperate with the lead screw. When the servo motor 3-31 drives the lead screw to rotate through the speed reducer 3-32, the piston extension rod 3-37 can make a linear movement relative to the piston rod 3-14 under the action of the flat key.

[0042] When the hydraulic cylinder 3-1 acts, the piston drives the entire position fine-tuning unit 3-3 to move simultaneously, pressing or releasing the workpiece. When the outer diameter of the lower pressing wheel 1-21 is worn after long-term use, the servo motor 3-31 is driven to drive the lead screw 3-35, so that the position of the piston extension rod 3-37 moves up a small distance, realizing the precise compensation of the height position of the lower pressing wheel 1-21.

[0043] During the debugging of the machine tool, the height position of the lower pressing wheel can be accurately controlled through the position fine-tuning unit 3-3 of the lower support oil cylinder mechanism 3. Since the hydraulic cylinder 3-1 has a fixed stroke, the position accuracy of the lower pressing wheel 1-21 can be ensured to remain unchanged during operation. During mass production, according to the wear law of the outer cylindrical surface of the pressing wheel, the automatic position compensation function can be designed through the program to improve the processing efficiency and the product qualification rate.

[0044] The upper pressing oil cylinder mechanism 2 mainly includes a mounting seat 2-1, a guide key 2-2, a mounting plate 2-3, ball head clamping oil cylinders 2-4 (a pair, arranged symmetrically left and right), a pressing oil cylinder 2-5, and a front hinge connecting plate 2-6 and a rear hinge connecting plate 2-7. The ball head clamping oil cylinder 2-4 includes a cylinder block 2-41, a piston rod 2-42, a ball head clamping plate 2-43, and a guide plate 2-44. The pressing oil cylinder 2-5 includes a ball head 2-51, an upper gland 2-52, a cylinder block 2-53, a pull rod 2-54, a lower gland 2-55, a piston rod 2-56, a hinge shaft 2-57, etc. The ball head clamping oil cylinder 2-4 is connected to the mounting seat 2-1 through the mounting plate 2-3 and the guide key 2-2. The mounting seat 2-1 is connected to the main body box of the machine tool. The upper end of the pressing oil cylinder 2-5 is connected to the ball head clamping oil cylinder 2-4 through the ball head 2-51, and the lower end is connected to the upper pressing wheel unit 1-1 through the front hinge connecting plate 2-6 and the rear hinge connecting plate 2-7, which is used to provide the pressing force of the upper pressing wheel 1-11 on the workpiece.

[0045] The piston rod 2-42 of the ball head clamping oil cylinder 2-4 is connected to the ball head clamping plate 2-43. The ball head clamping plate 2-43 moves between a pair of guide plates 2-44. The guide plates 2-44 are fixed on the cylinder block 4-41. The simultaneous movement of a pair of ball head clamping oil cylinders 2-4 can realize the opening and closing of the ball head clamping plate 2-43. The ball head at the upper end of the pressing oil cylinder 2-5 is located inside the space formed by a pair of ball head clamping plates 2-43, and the central height of the ball head 2-51 remains fixed. The hinge shaft 2-57 at the lower end of the pressing oil cylinder 2-5 is fixedly connected to the piston rod 2-56. At the same time, the hinge shaft 2-57 is connected to the front hinge connecting plate 2-6 and the rear hinge connecting plate 2-7, and the front hinge connecting plate 2-6 and the rear hinge connecting plate 2-7 can rotate along the hinge shaft 2-57.

[0046] When the pressing oil cylinder 2-5 is working, the upper pressing wheel unit 1-1 moves up and down in the vertical direction. Since the left side of the upper pressing wheel unit 1-1 is fixedly connected to the auxiliary support mechanism 4 through the rocker arm 1-3, the movement of the upper pressing wheel unit 1-1 in the vertical direction is a rotation centered on the axis of the rocker arm 1-3; the front hinge connecting plate 2-6 and the rear hinge connecting plate 2-7 are fixedly connected to the upper pressing wheel unit 1-1. Therefore, the pressing oil cylinder 2-5 realizes rotation between the front hinge connecting plate 2-6 and the rear hinge connecting plate 2-7 through the hinge shaft 2-57; the left side of the lower pressing wheel 1-21 is a telescopic universal joint 1-6, and the telescopic universal joint 1-6 can automatically adjust the position when the lower pressing wheel unit 1-2 moves; when changing the workpiece variety and changing the position of the pressing wheel driving action surface, the upper pressing wheel unit 1-1 and the pressing oil cylinder 2-5 can move back and forth along the channel formed by the ball head clamping plate 2-43.

[0047] The auxiliary support mechanism 4 mainly includes a servo motor 4-1, a lead screw shaft system 4-2, a linear bearing assembly 4-3, a mounting plate 4-4, and rocker arm units 4-5 (two sets). The rocker arm unit 4-5 includes a rocker arm fixing seat 4-51, a support shaft system 4-52, and a rocker arm 4-53.

[0048] The upper pressing wheel unit 1-1 and the lower pressing wheel unit 1-2 are fixedly connected to the auxiliary support mechanism 4 through the rocker arm 1-3. The rocker arm 1-3 is designed with a waist-shaped hole to make the position of the pressing wheel adjustable in the left and right directions; the auxiliary support mechanism 4 is fixedly connected to the feeding table (not shown in the figure) through the linear bearing assembly 4-3 and the lead screw shaft system 4-2. During mass production, the automatic adjustment of the position of the workpiece driving action surface (front and back directions) can be realized by using program control.

[0049] In this embodiment, the workpiece rotates by itself through friction drive. The rubber layers on the outer edges of a pair of pressing wheels (the upper pressing wheel 1-11 and the lower pressing wheel 1-21) are in contact with the upper and lower surfaces of the workpiece and rotate synchronously in opposite directions to drive the workpiece to rotate by itself. Since the action surface for driving the workpiece to rotate by itself is also the machining surface of the workpiece, and there are many workpiece varieties and the outer dimensions are inconsistent, the position of the driving action surface of the workpiece must be adjustable in the front and back directions. This function is realized by the drive of the servo motor 4-1 of the auxiliary support mechanism 4 and can be automatically adjusted.

[0050] To ensure the rotation accuracy of the workpiece, the contact positions of the upper pressing wheel 1-11 and the lower pressing wheel 1-21 with the workpiece surface need to be on the symmetry axis of the workpiece. Therefore, the position of the pressing wheel relative to the workpiece needs to be adjustable in the left and right directions. This function is realized by the rocker arm 1-3 and is fixed and unchanged after adjustment during assembly, and is not affected by changing the workpiece variety during machining.

[0051] To ensure the machining accuracy of the workpiece, it is necessary to strictly control the positioning accuracy of the workpiece in the vertical direction (along the axis of the grinding wheel), ensure that the lower end face of the workpiece is coplanar with the lower surface of the grinding wheel, and avoid unqualified products caused by warping of the workpiece during machining. At the same time, to avoid the inconsistency of machining accuracy caused by the wear of the working surface of the pressure wheel, it is necessary to adjust the position of the pressure wheel in the vertical direction in real time. This function is realized by the lower support cylinder mechanism 3 and can be automatically adjusted.

[0052] Those skilled in the art can make various modifications and variations to the present invention. Provided that these modifications and variations are within the scope of the claims of the present invention and its equivalent technologies, these modifications and variations are still within the protection scope of the present invention patent.

[0053] The content not described in detail in the specification is the prior art well known to those skilled in the art.

Claims

1. A workpiece self-rotation drive system for precision grinding, characterized in that: it includes a drive mechanism, an oil cylinder mechanism and an auxiliary support mechanism connected in sequence, and the oil cylinder mechanism is composed of an upper pressing oil cylinder mechanism and a lower support oil cylinder mechanism; the drive mechanism includes a servo motor, a transfer case, a telescopic universal joint, a pressure wheel unit and a shafting connected in sequence. The pressure wheel unit includes an upper pressure wheel unit and a lower pressure wheel unit. The upper pressure wheel unit is connected to the upper pressing oil cylinder mechanism, and the lower pressure wheel unit is connected to the lower support oil cylinder mechanism. The upper pressure wheel unit and the lower pressure wheel unit are connected to the auxiliary support mechanism through a rocker arm. Bevel gear pairs are provided at the front ends of the upper pressure wheel unit and the lower pressure wheel unit, upper pressure wheels and lower pressure wheels are provided at the rear ends of the upper pressure wheel unit and the lower pressure wheel unit, and rubber layers are provided on the outer edges of the upper pressure wheel and the lower pressure wheel; the upper pressing oil cylinder mechanism includes a mounting seat, a guide key, a mounting plate, a ball head clamping oil cylinder, a pressing oil cylinder, and a front hinge connecting plate and a rear hinge connecting plate. The ball head clamping oil cylinder is connected to the mounting seat through the mounting plate and the guide key, and the mounting seat is connected to the main body box of the machine tool. The upper end of the pressing oil cylinder is connected to the ball head clamping oil cylinder through a ball head, and the lower end is connected to the upper pressure wheel unit through the front hinge connecting plate and the rear hinge connecting plate, for providing the pressing force of the upper pressure wheel on the workpiece; the lower support oil cylinder mechanism includes a hydraulic oil cylinder and a position fine-tuning unit nested inside the cylinder piston; the auxiliary support mechanism includes a servo motor, a lead screw shafting, a linear bearing assembly and a rocker arm unit connected in sequence.

2. The workpiece self-rotation drive system for precision grinding according to claim 1, characterized in that: the ball head clamping oil cylinder includes a cylinder body, a piston rod, a ball head clamping plate and a guide plate. The pressing oil cylinder includes a ball head, an upper gland, a cylinder body, a pull rod, a lower gland, a piston rod and a hinge shaft. The piston rod of the ball head clamping oil cylinder is connected to the ball head clamping plate, and the ball head clamping plate moves between a pair of guide plates fixed on the cylinder body. The simultaneous action of a pair of ball head clamping oil cylinders can realize the opening and closing of the ball head clamping plate; the ball head at the upper end of the pressing oil cylinder is located inside the space formed by a pair of ball head clamping plates, and the center height of the ball head remains fixed; the hinge shaft at the lower end of the pressing oil cylinder is fixedly connected to the piston rod, and at the same time the hinge shaft is connected to the front hinge connecting plate and the rear hinge connecting plate, and the front hinge connecting plate and the rear hinge connecting plate can rotate along the hinge shaft.

3. The workpiece self-rotation drive system for precision grinding according to claim 2, characterized in that: the hydraulic oil cylinder includes a cylinder body, an upper gland, a lower gland, a piston rod and a joint. The stroke of the piston rod is a fixed value, and the cylinder body is installed on the feeding table and fixed. The position fine-tuning unit includes a servo motor, a reduction gearbox, a reduction gearbox mounting seat, a coupling, a lead screw shaft system, a piston connecting sleeve, a piston extension rod, a positioning block, and a connecting plate. The servo motor, the reduction gearbox, the coupling, and the lead screw shaft system are fixedly connected through the reduction gearbox mounting seat and the piston connecting sleeve to the piston rod. The piston extension rod is located inside the piston rod, and there is a clearance fit between the piston extension rod and the piston rod. A flat key is provided on the outer wall of the piston extension rod, and a groove is provided in the inner hole of the piston rod corresponding to the position of the flat key. The piston extension rod is provided with a transmission threaded hole that cooperates with the lead screw. When the servo motor drives the lead screw to rotate through the reduction gearbox, the piston extension rod can make a linear movement relative to the piston rod under the action of the flat key.

4. The workpiece self-rotation drive system for precision grinding according to claim 3, characterized in that: the connecting plate is fixedly connected to the lower pressing wheel unit, and there is a rigid contact and no fixed connection between the connecting plate and the positioning block.

5. The workpiece self-rotation drive system for precision grinding according to any one of claims 1-4, characterized in that: the swing arm unit includes a swing arm fixing seat, a support shaft system, and a swing arm.

6. The workpiece self-rotation drive system for precision grinding according to claim 5, characterized in that: the swing arm is provided with a kidney-shaped hole, so that the positions of the upper pressing wheel and the lower pressing wheel in the left-right direction are adjustable.

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