A superfinishing apparatus

Abstract

The application discloses a superfinishing equipment, which comprises a supporting device for supporting a roller and driving the roller to rotate in a circumferential direction; a first grinding device and a second grinding device are arranged on a moving path of the supporting device for conveying the roller; the first grinding device is used for rigid oscillation grinding of a middle part of the roller; and the second grinding device is used for elastic grinding of end parts of the roller; the first grinding device comprises a moving frame capable of vertically lifting and axially moving relative to the roller, a tool rest and a vibrating mechanism are positioned on the moving frame, a rigid grinding tool is mounted at one end of the tool rest, and the vibrating mechanism is connected with the tool rest and used for transmitting reciprocating oscillation to the rigid grinding tool; the application can perform segmented superfinishing treatment on the circumferential surface of the roller, realizes consistency of overall machining precision of the roller, makes the produced roller run more stably, and improves the service life and reliability of the bearing.

Description

Technical Field

[0001] This invention relates to the field of ultra-precision machining technology for bearing components, and in particular to an ultra-precision machining equipment. Background Technology

[0002] In the manufacturing process of rolling bearings, ultra-precision grinding is the final step in the machining of rollers (also known as rolling elements, which are used to transmit motion and load in the narrow space between the inner and outer rings of a bearing). It plays an important role in refining the surface roughness of the rollers, improving the physical and mechanical properties of the roller surface, reducing bearing vibration and noise, and extending the service life of the bearing.

[0003] Existing ultra-precision grinding typically involves rotating a roller at a certain speed while holding a fine-grained mold (such as an oilstone or grinding wheel) perpendicular to the roller's rotation direction. The fine-grained mold abuts against the roller surface, creating a rapid and short reciprocating oscillation motion that gradually removes minor unevenness and residual debris and metal particles from previous processes, resulting in a smoother and finer rolling surface. For example, Chinese invention patent CN101879698B discloses a double-cylinder slide and combined oilstone clamping mechanism for ultra-precision grinding of bearing rollers. This mechanism uses a cylinder pair in conjunction with upper and lower slide pairs to lower the oilstone clamp carrying the oilstone and bring it against the roller surface. The oilstone, along with the oscillating slide pair, performs micro-cutting on the roller surface, improving the roller's precision level.

[0004] However, the generatrices of some bearing rollers, such as cylindrical and tapered rollers, are mostly circular arcs, circular arc-straight lines, and logarithmic curves. In order to distribute the load evenly and reduce the stress concentration between the roller and the bearing, there is a curved transition between the end faces of the rollers (hereinafter referred to as the ends of the rollers) and the outer circular surface in the middle. The curvature change of this transition section is usually large. Therefore, when using a hard, fine-grained mold (such as an oilstone) to perform ultra-precision machining on cylindrical and tapered bearing rollers, the contact form and contact grinding force between the mold and the middle and ends of the roller will change accordingly due to the existence of the curved transition section. This makes the mold limited when machining the ends of the rollers with large curvature changes. It is often difficult to maintain the same machining accuracy as the middle of the roller, which reduces the running stability of the roller, causes uneven bearing load, and affects the bearing's life and reliability. Summary of the Invention

[0005] The present invention aims to provide an ultra-precision machining equipment that can perform segmented ultra-precision processing on the circumferential surface of rollers, so that the overall machining accuracy of the rollers tends to be consistent.

[0006] To solve the above-mentioned technical problems, the present invention is achieved through the following technical solution: An ultra-precision machining equipment includes: a support device for supporting a roller and driving the roller to rotate circumferentially; and a first grinding device and a second grinding device; the first grinding device is used to perform rigid oscillatory grinding on the middle part of the roller; the second grinding device is used to perform elastic grinding on the end of the roller; the first grinding device includes a movable frame that can be vertically lifted and axially moved relative to the roller, a tool holder and a vibration mechanism are positioned on the movable frame, a rigid grinding tool is installed at one end of the tool holder, and the vibration mechanism is connected to the tool holder and used to transmit reciprocating oscillations to the rigid grinding tool.

[0007] Through the above technical solution, based on the rigid oscillating grinding of the middle part of the roller by the first grinding device, a second grinding device is added to perform elastic grinding on the end of the roller, taking into account the characteristic of the curved transition section at the end of the roller. This makes the roller fit the end surface of the roller to a greater extent, increases the grinding contact area during the ultra-precision machining of the end of the roller, and thus makes the machining accuracy of the end of the roller approach that of the middle part of the roller, achieves the consistency of the overall machining accuracy of the roller, makes the produced roller run more smoothly, and improves the service life and reliability of the bearing.

[0008] Furthermore, the vibration mechanism includes a housing, which is positioned on a movable frame. A main shaft is inserted inside the housing and can rotate circumferentially relative to the housing. A connecting seat is integrally positioned at one end of the housing near the roller for connecting the tool holder. An oscillating sleeve is rotatably positioned inside the connecting seat. The main shaft extends into the connecting seat and is eccentrically connected to the oscillating sleeve.

[0009] Furthermore, the tool holder is elastic, and the movable frame is also provided with a first pressing mechanism. The first pressing mechanism includes a first telescopic member, and the telescopic end of the first telescopic member is provided with a pressing plate. The pressing plate is positioned above the connecting seat and is used to press the tool holder, thereby driving the rigid abrasive to abut against or detach from the middle surface of the roller.

[0010] Furthermore, the first telescopic component is a cylinder telescopic mechanism.

[0011] Furthermore, the top pressure plate is positioned above the connecting seat, and the connecting seat is provided with a positioning groove that is adapted to engage the top pressure plate. The side wall of the top pressure plate is slidably connected to the inner wall of the positioning groove.

[0012] Furthermore, the second grinding device of the ultra-precision machining equipment is integrally connected to the mobile frame of the ultra-precision machining equipment. It includes a second pressing mechanism. An elastic grinding surface is formed on the telescopic end of the second pressing mechanism of the ultra-precision machining equipment. The second pressing mechanism of the ultra-precision machining equipment can drive the elastic grinding surface of the ultra-precision machining equipment to abut or disengage from the end of the roller.

[0013] Furthermore, the second pressing mechanism of the ultra-precision machining equipment includes a second telescopic component, which is positioned on a movable frame. Its telescopic end is provided with a bracket, and the bracket is provided with a drive wheel set. The drive wheel set can rotate relative to the bracket. The drive wheel set is connected to a flexible abrasive belt for contacting the end of the roller, and the elastic grinding surface is formed on the flexible abrasive belt.

[0014] Furthermore, the output end of the vibration mechanism of the ultra-precision machining equipment is connected to the second grinding device of the ultra-precision machining equipment to transmit reciprocating oscillations to the grinding end of the second grinding device of the ultra-precision machining equipment.

[0015] Furthermore, the ultra-precision machining equipment has a vibration guide plate on its movable frame, and the ultra-precision machining equipment tool holder is positioned at one end of the ultra-precision machining equipment vibration guide plate. The other end of the ultra-precision machining equipment vibration guide plate away from the tool holder is equipped with a slide rail. The direction of the ultra-precision machining equipment slide rail is parallel to the pressing direction of the second pressing mechanism. A slider is slidably connected to the ultra-precision machining equipment slide rail, and the ultra-precision machining equipment bracket is connected to the ultra-precision machining equipment slider.

[0016] Furthermore, the drive wheel assembly of the ultra-precision machining equipment includes a first wheel body, a second wheel body, and a contact wheel at the end for contacting the roller. One end of the flexible abrasive belt of the ultra-precision machining equipment is wound around the first wheel body, and the other end of the flexible abrasive belt passes through the contact wheel and is finally connected in series to the second wheel body. The first wheel body is connected to a brake disc for applying rotational resistance to the first wheel body. The second wheel body is connected to a second motor for driving the second wheel body to rotate. The elastic grinding surface of the ultra-precision machining equipment is formed on the outer surface of the contact wheel through which the flexible abrasive belt passes. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural diagram of the ultra-precision machining equipment disclosed herein. Figure 1 ; Figure 2 A schematic diagram of the roller structure Figure 3 This is a schematic diagram of the internal structure of the first grinding device in the ultra-precision machining equipment disclosed herein; Figure 4 This is a three-dimensional structural diagram of the ultra-precision machining equipment disclosed herein. Figure 2 ; Figure 5 A schematic diagram showing the connection between the main spindle and the oscillation sleeve; Figure 6 A schematic diagram of the structure of the first embodiment of the elastic grinding surface; Figure 7 This is a three-dimensional structural diagram of the ultra-precision machining equipment disclosed herein. Figure 3 ; In the picture: Reference numerals: 1. Support device; 11. First ejector pin; 12. Second ejector pin; 2. First grinding device; 21. Moving frame; 211. Vibration guide plate; 212. Slide rail; 213. Slider; 22. Vibration mechanism; 221. Housing; 222. First motor; 223. Main shaft; 224. Connecting seat; 225. Vibrating bushing; 226. Positioning groove; 23. First pressing mechanism; 231. First telescopic component; 232. Pressing plate; 24. Tool holder; 25. Rigid grinding wheel; 3. Second grinding device; 31. Second pressing mechanism; 311. Second telescopic component; 312. Support; 32. Elastic grinding surface; 33. Flexible base layer; 34. Abrasive layer; 35. Drive wheel assembly; 351. First wheel body; 352. Second wheel body; 353. Contact wheel; 354. Second motor; 355. Brake disc; 36. Flexible abrasive belt; 4. Roller; 41. Middle part; 42. End. Detailed Implementation

[0018] Embodiments of the present invention are described in detail below, with examples of the embodiments illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0019] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0020] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0021] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0022] The present invention will be further described in detail below with reference to the accompanying drawings: The specific embodiments of the present invention are as follows: refer to Figure 1 , Figure 2 An ultra-precision machining equipment, similar to existing ultra-precision machines on the market, includes a support device 1 and a grinding system. The support device 1 can support the roller 4 and drive the roller 4 to rotate circumferentially. The grinding system is positioned on one side of the support device 1 and is used to perform ultra-precision processing on the circumferential surface of the roller 4.

[0023] Compared with the prior art, the improvement of this invention lies in that the grinding device consists of a first grinding device 2 and a second grinding device 3. During operation, the first grinding device 2 independently performs rigid oscillatory grinding on the outer circular surface of the middle part 41 of the roller 4, where the curvature change is relatively small. Meanwhile, the second grinding device 3 independently performs elastic grinding on the curved transition section of the end 42 of the roller 4, where the curvature change is larger. Through this technical solution, based on the rigid oscillatory grinding of the middle part 41 of the roller 4 by the first grinding device 2, and considering the curved transition section of the end 42 of the roller 4, an additional second grinding device 3 is added to perform elastic grinding on the end 42 of the roller 4. This allows for greater contact with the surface of the end 42 of the roller 4, increasing the grinding contact area during ultra-precision machining. Consequently, the machining accuracy of the end 42 of the roller 4 approaches that of the middle part 41 of the roller 4, achieving consistency in the overall machining accuracy of the roller 4. This results in a more stable operation of the produced roller 4, improving the service life and reliability of the bearing.

[0024] It should be noted that the "rigid oscillating grinding" and "elastic grinding" mentioned above are mainly used to describe the degree of contact between the tool and the circumferential surface of the roller during ultra-precision machining. That is, when the second grinding device 3 adopts the elastic grinding method, the degree of contact between its grinding end and the roller surface is greater than that of the rigid oscillating grinding method of the first grinding device 2.

[0025] The following details the composition and connection methods of each device: refer to Figure 1The support device 1 includes a first ejector pin 11 and a second ejector pin 12 coaxially arranged with the first ejector pin 11. In use, a roller 4 with center holes at both ends of the axial direction can be assembled between the first ejector pin 11 and the second ejector pin 12. The first ejector pin 11 and the second ejector pin 12 clamp the roller 4 in both directions and drive the roller 4 to rotate circumferentially. In this embodiment, the specific implementation structure of the first ejector pin 11 and the second ejector pin 12 clamping the roller 4 and driving the roller 4 to rotate circumferentially can be referred to in the Chinese utility model patent with publication number "CN218904884U". In addition, the support device 1 can also be in the form of guide rollers. By placing the roller 4 to be processed between two sets of guide rollers, the two sets of guide rollers support and drive the roller 4 to rotate circumferentially. The structure of the guide roller support device 1 can be referred to in the Chinese invention patent application with publication number "CN115847273A". The above two types of support devices 1 are common in existing roller 4 ultra-precision machines, so they will not be described in detail.

[0026] refer to Figure 1 , Figure 3 and Figure 5The first grinding device 2 includes a movable frame 21, which can be vertically raised and lowered and axially moved relative to the roller 4. A tool holder 24 is positioned on the movable frame 21, with one end of the tool holder 24 facing the roller 4 and a rigid grinding tool 25 is positioned and mounted on it. The rigid grinding tool 25 can be a hard, fine-grained mold such as an oilstone or a grinding wheel. In addition, the movable frame 21 is also equipped with a vibration mechanism 22, which includes a housing 221 and a first motor 222. The housing 221 and the first motor 222 are positioned on the movable frame 21. A main shaft 223 is rotatably inserted inside the housing 221. The main shaft 223 is axially perpendicular to the roller 4. The first motor 222 is connected to the main shaft 223 through a transmission structure such as gears. The spindle 223 can rotate circumferentially relative to the housing 221. A connecting seat 224 is integrally positioned at the end of the housing 221 near the roller 4. The end of the connecting seat 224 away from the moving frame 21 is integrally connected to the tool post 24. An oscillating bushing 225 is rotatably positioned inside the connecting seat 224. The end of the spindle 223 away from the moving frame 21 extends into the connecting seat 224 and is eccentrically connected to the oscillating bushing 225. For easy replacement and maintenance, the spindle 223 and the oscillating bushing 225 are detachably connected by fasteners such as keys and pins. In this embodiment, for the sake of simplifying assembly, torque transmission capacity, and connection reliability, a key is selected to detachably connect the spindle 223 and the oscillating bushing 225. Furthermore, it should be noted that the functional limitation of the movable frame 21 being able to "vertically lift and move axially relative to the roller 4" can be achieved through structures such as a screw and nut mechanism and a cylinder mechanism. Specifically, the screw and nut mechanism can drive the movable frame 21 to move axially relative to the roller 4, and a telescopic mechanism such as a cylinder can be installed on the screw and nut mechanism to drive the movable frame 21 to vertically lift and move relative to the roller 4. The above-mentioned functional limitation and implementation method of the movable frame 21 are conventional methods of existing ultra-precision grinding machines on the market, and will not be elaborated further here.

[0027] Based on the above technical solution, during operation, the movable frame 21 can be vertically raised and lowered so that the rigid grinding wheel 25 on the tool holder 24 contacts and abuts against the outer circular surface of the middle part 41 of the roller 4. Then, the rigid grinding wheel 25 is driven to move axially relative to the middle part 41 of the roller 4 to perform rigid grinding on the outer circular surface of the middle part 41 of the roller 4. During this process, the first motor 222 drives the spindle 223 to rotate, and the spindle 223 transmits power to the oscillating sleeve 225, causing the oscillating sleeve 225 to rotate eccentrically relative to the connecting seat 224 to generate a reciprocating oscillating impact force. The generated oscillating impact force is transmitted to the tool holder 24 through the connecting seat 224, so that the rigid grinding wheel 25 on the tool holder 24 can also reciprocate relative to the roller 4. The above technical solution uses a spindle 223 in conjunction with an oscillating sleeve 225 to generate reciprocating oscillations through eccentric rotation. This not only has a simple and reliable structure and can stably transmit oscillation force to the tool holder 24, but also allows for flexible adjustment of the oscillation frequency and amplitude of the rigid grinding wheel 25 by changing the speed of the first motor 222 and the size of the oscillating sleeve 225 to meet specific processing requirements and obtain the best processing effect.

[0028] It should be noted that the advantage of reciprocating oscillating grinding is that it allows the rigid grinding wheel 25 to contact the surface of the roller 4 more evenly, avoiding local over-grinding or under-grinding. It helps to eliminate surface texture and micro-defects in the middle 41 of the roller 4, resulting in a smoother and more uniform roller 4 surface. This improves processing efficiency, bearing life and performance. In addition, reciprocating oscillation can improve the contact efficiency between the rigid grinding wheel 25 and air and cutting fluid, enhance the cooling effect during the grinding process, reduce heat accumulation and local temperature rise, and reduce the impact of thermal effects on the roller 4 material during grinding.

[0029] Existing roller ultra-precision grinding machines typically use a single cylinder piston moving up and down to make a hard, rigid abrasive tool 25, such as an oilstone or grinding wheel, press against the surface of the roller 4 for ultra-precision processing. This mechanism can be called a single-cylinder pressing mechanism. This mechanism has some problems: 1. There is no buffer when the cylinder moves downward, and the rigid abrasive tool 25 will directly impact the roller 4. When the cylinder thrust is large, pits are easily generated on the surface of the roller 4, and the mold is very likely to break; 2. It is difficult to accurately control the grinding amount of the roller 4. Since the radial grinding depth of the abrasive tool on the roller 4 is usually less than the extension margin after the cylinder pushes the mold against the surface of the roller 4, the mold will continue to press against the surface of the roller 4 after completing the rated grinding amount, thus producing grinding errors.

[0030] To address the shortcomings of the existing rigid oscillating grinding system employing a single-cylinder pressing mechanism, this application makes further improvements to the first grinding device 2: (Refer to...) Figure 3 and Figure 4The tool holder 24 is elastic, and the moving frame 21 is also equipped with a first pressing mechanism 23. The first pressing mechanism 23 includes a first telescopic member 231, and the telescopic end of the first telescopic member 231 is equipped with a pressing plate 232, which is used to press the tool holder 24 and thus drive the rigid grinding wheel 25 to abut or disengage from the surface of the middle part 41 of the roller 4. During operation, the moving frame 21 can first perform preliminary positioning, that is, the moving frame 21 drives the rigid grinding wheel 25 to descend and approach the middle part 41 of the roller 4, so that the vertical distance between the bottom grinding surface of the rigid grinding wheel 25 and the outer circular surface of the middle part 41 of the roller 4 is between 1mm and 3mm. After the rigid grinding wheel 25 has completed preliminary positioning, the first telescopic member 231 drives the pressing plate 232 to descend, applying pressure to the tool holder 24, causing the tool holder 24 to undergo a slight bending deformation towards the roller 4, thereby driving the rigid grinding wheel 25 to abut against the surface of the middle part 41 of the roller 4. Through the above technical solution, segmented positioning is achieved by the moving frame 21 and the first top-pressing mechanism 23. The tool holder 24 forms an indirect buffer, preventing the rigid grinding wheel 25 from directly impacting the roller 4 while simultaneously achieving precise micro-feeding, further improving grinding accuracy. In this embodiment, the top-pressing plate 232 is positioned above the connecting seat 224, indirectly applying pressure to the tool holder 24 by pressing against the connecting seat 224. This design increases the contact area between the top-pressing plate 232 and the tool holder 24, making the elastic deformation of the tool holder 24 more uniform. It should be noted that in this embodiment, the elasticity of the tool holder 24 can be achieved in various ways. For example, the tool holder 24 itself can be made of steel with good toughness and vibration conductivity (such as alloy tool steel, elastic alloy steel, stainless steel, etc.), or a certain elastic deformation allowance can be provided through the connection method between the tool holder 24 and the moving frame 21.

[0031] The implementation structure of the first telescopic member 231 is diverse. In this embodiment, in order to further improve the buffering effect, the first telescopic member 231 adopts a cylinder telescopic structure. Since there is a certain elastic margin during the cylinder telescopic process, the elastic margin can play a buffering role when the top pressure plate 232 contacts the tool holder 24, slowing down the elastic deformation rate of the tool holder 24 and preventing the rigid grinding wheel 25 from hitting the roller 4.

[0032] refer to Figure 4 In order to reduce the impact of the vibration generated by the vibration mechanism 22 on the structural strength and stability of the first telescopic member 231, in this embodiment, the top pressure plate 232 is positioned above the connecting seat 224. The connecting seat 224 is provided with a positioning groove 226 that is adapted to engage the top pressure plate 232. The side wall of the top pressure plate 232 is slidably connected to the inner wall of the positioning groove 226. The positioning groove 226 is used to slide and limit the top pressure plate 232, thereby enhancing the shock absorption.

[0033] refer to Figure 1 , Figure 4 and Figure 7The second grinding device 3 is integrally connected to the movable frame 21. It includes a second pressing mechanism 31. An elastic grinding surface 32 is formed on the telescopic end of the second pressing mechanism 31. Through the above technical solution, during operation, the second pressing mechanism 31 can work in staggered shifts with the first grinding device 2 during the single axial movement of the movable frame 21 relative to the roller 4. This causes the elastic grinding surface 32 to abut against the end 42 of the roller 4, so that the elastic grinding surface 32 wraps and fits the surface of the end 42 of the roller 4, completing the ultra-precision treatment of the curved transition section of the end 42 of the roller 4, and making the overall machining accuracy of the circumferential surface of the roller 4 tend to be consistent.

[0034] Since the implementation structure of the elastic grinding surface 32 is diverse, two embodiments are provided below to describe two implementation structures of the elastic grinding surface 32.

[0035] Example 1: refer to Figure 3 and Figure 6 The second grinding device 3 includes a flexible base layer 33, which can be made of materials such as glass fiber or polyester fiber. One end of the flexible base layer 33 is connected to the telescopic end of the second pressing mechanism 31, and the other end is formed with an abrasive layer 34. An elastic grinding surface 32 is formed on the abrasive layer 34. During operation, the second pressing mechanism 31 drives the flexible base layer 33 and the abrasive layer 34 to press against the surface of the end 42 of the roller 4. The flexible base layer 33 deforms and then drives the abrasive layer 34 to wrap around the surface of the end 42 of the roller 4, thus completing the ultra-precision treatment of the end 42 of the roller 4.

[0036] While the above-described embodiments can form an elastic grinding surface 32, after several ultra-precision treatments, the abrasive layer 34, due to its limited area and the need to adhere to the end 42 surface of the roller 4 for grinding, is prone to wear and requires frequent replacement. Therefore, this specific embodiment proposes a second embodiment for forming the elastic grinding surface 32 and a corresponding first grinding apparatus 2 implementation structure. The accompanying drawings (except for...) of this disclosure... Figure 6 The elastic grinding surface 32 shown in the external diagram is basically the next implementation structure.

[0037] Example 2: refer to Figure 1 , Figure 4 and Figure 7The second pressing mechanism 31 includes a second telescopic member 311, which is positioned on the movable frame 21. Its telescopic end is provided with a bracket 312, and the bracket 312 is provided with a drive wheel assembly 35. The drive wheel assembly 35 can rotate relative to the bracket 312. The drive wheel assembly 35 is connected to a flexible abrasive belt 36 for contacting the end 42 of the roller 4. An elastic grinding surface 32 is formed on the flexible abrasive belt 36. Through this technical solution, the drive wheel assembly 35 can drive the flexible abrasive belt 36 to run, and the elastic grinding surface 32 is defined on the flexible abrasive belt 36. Compared to the previous embodiment, this greatly extends the area and service life of the elastic grinding surface 32, avoids frequent replacements, and improves production efficiency. The second telescopic member 311 is the same as the first telescopic member 231, and is also a cylinder telescopic mechanism.

[0038] To further extend the area and service life of the elastic grinding surface 32, this embodiment further defines the drive wheel assembly 35. The drive wheel assembly 35 includes a first wheel body 351, a second wheel body 352, and a contact wheel 353. The contact wheel 353 is rotatably positioned on the top of the bracket 312 and is used to contact the end 42 of the roller 4. The first wheel body 351 and the second wheel body 352 are rotatably positioned on the bracket 312 and located above the contact wheel 353. One end of the flexible abrasive belt 36 is wrapped around the first wheel body 351, and the other end passes through the bottom of the contact wheel 353 and is finally connected in series with the second wheel body 352. A second motor 354 is provided on the second wheel body 352. The second motor 354 is used to drive the second wheel body 352 to rotate. The elastic grinding surface 32 is formed on the outer surface of the flexible abrasive belt 36 passing through the contact wheel 353.

[0039] During operation, the first wheel 351 winds and stores the flexible abrasive belt 36. When grinding is required on the end 42 of the roller 4, the second motor 354 drives the second wheel 352 to rotate and feed the flexible abrasive belt 36, which slowly passes through the contact wheel 353 at a low speed to grind the end 42 of the roller 4. The processed flexible abrasive belt 36 is then wound back onto the surface of the second wheel 352. Through the above technical solution, the longest possible flexible abrasive belt 36 can be mounted on the bracket 312 within a certain volume, increasing the length and service life of the elastic grinding surface 32. At the same time, it can avoid the reuse of the flexible abrasive belt 36, constantly updating the elastic grinding surface 32 at the contact wheel 353, so that the precision of the products ultra-precision machined by the second grinding device 3 tends to be consistent.

[0040] join Figure 1 , Figure 4To prevent the flexible sanding belt 36 from continuing to be discharged due to inertia when the first motor 222 stops, thus causing the flexible sanding belt 36 to lose its elastic tension, in this specific embodiment, the first wheel 351 is also connected to a brake disc 355. During operation, the brake disc 355 can apply continuous rotational resistance to the first wheel 351, so that the first wheel 351 can be braked instantly after the second motor 354 stops, thus keeping the flexible sanding belt 36 in an elastic tension state.

[0041] refer to Figure 7 To further improve the grinding efficiency and grinding quality of the second grinding device 3, in this embodiment, the output end of the vibration mechanism 22 is connected to the second grinding device 3. Through the above technical solution, the first grinding device 2 and the second grinding device 3 share a common oscillation source. The reciprocating oscillation generated by the vibration mechanism 22 can also be transmitted to the elastic grinding surface 32 of the second grinding device 3, so that the second grinding device 3 can perform elastic oscillation grinding on the end 42 of the roller 4, thereby improving the processing efficiency of the second grinding device 3 and reducing its grinding heat effect.

[0042] The connection between the vibration mechanism 22 and the second grinding device 3 is described in detail below: A guide plate 211 is provided on the movable frame 21. A tool holder 24 is positioned at one end of the guide plate 211. A slide rail 212 is provided at the other end of the guide plate 211 away from the tool holder 24. The direction of the slide rail 212 is parallel to the pressing direction of the second pressing mechanism 31. A slider 213 is slidably connected to the slide rail 212, and a bracket 312 is connected to the slider 213. Through the above technical solution, the bracket 312 is slidably connected to the guide plate 211 via the slide rail 212 and the slider 213, allowing the reciprocating vibration generated by the vibration mechanism 22 to be transmitted to the bracket 312 independently through the tool holder 24 and the guide plate 211. Simultaneously, the slide rail 212 and the slider 213 provide vertical sliding limit for the bracket 312, effectively reducing the impact of reciprocating oscillations on the second pressing mechanism 31 and improving the operational stability of the second grinding device 3.

[0043] The above are merely specific embodiments of the present invention, but the technical features of the present invention are not limited thereto. Any changes or modifications made by those skilled in the art within the scope of the present invention are covered by the patent scope of the present invention.

Claims

1. An ultra-precision machining equipment for ultra-precision grinding of bearing rollers (4), characterized in that: include: The support device (1) is used to support the roller (4) and drive the roller (4) to rotate circumferentially; it also includes a first grinding device (2) and a second grinding device (3); The first grinding device (2) is used to perform rigid oscillatory grinding on the middle part (41) of the roller (4); The second grinding device (3) is used to perform elastic grinding on the end (42) of the roller (4), and the end (42) of the roller (4) has a curved transition section; The first grinding device (2) includes a movable frame (21) that can be vertically lifted and axially moved relative to the roller (4). A tool holder (24) and a vibration mechanism (22) are positioned on the movable frame (21). A rigid grinding wheel (25) is installed at one end of the tool holder (24). The vibration mechanism (22) is connected to the tool holder (24) and is used to transmit reciprocating oscillations to the rigid grinding wheel (25). The second grinding device (3) is integrally connected to the movable frame (21), and includes a second pressing mechanism (31). An elastic grinding surface (32) is formed on the telescopic end of the second pressing mechanism (31). The second pressing mechanism (31) can drive the elastic grinding surface (32) to abut or disengage from the end (42) of the roller (4). The second pressing mechanism (31) includes a second telescopic member (311), which is positioned on the movable frame (21). Its telescopic end is provided with a bracket (312). A drive wheel assembly (35) is provided on the bracket (312). The drive wheel assembly (35) can rotate relative to the bracket (312). The drive wheel assembly (35) is connected to a transmission mechanism for contacting the roller (4). The flexible abrasive belt (36) at the end (42) has an elastic grinding surface (32) formed on it. The output end of the vibration mechanism (22) is connected to the second grinding device (3) and is used to transmit reciprocating oscillations to the grinding end of the second grinding device (3). The moving frame (21) is provided with a vibration guide plate (211). The tool holder (24) is positioned at one end of the vibration guide plate (211). The other end of the vibration guide plate (211) away from the tool holder (24) is provided with a slide rail (212). The direction of the slide rail (212) is parallel to the pressing direction of the second pressing mechanism (31). A slider (213) is slidably connected on the slide rail (212). The bracket (312) is connected to the slider (213).

2. The ultra-precision machining equipment as described in claim 1, characterized in that: The vibration mechanism (22) includes a housing (221) positioned on a movable frame (21). A main shaft (223) is inserted inside the housing (221). The main shaft (223) can rotate circumferentially relative to the housing (221). A connecting seat (224) is positioned at one end of the housing (221) near the roller (4). The bottom of the connecting seat (224) is integrally connected to the tool holder (24). An oscillating sleeve (225) is rotatably positioned inside the connecting seat (224). The main shaft (223) extends into the connecting seat (224) and is eccentrically connected to the oscillating sleeve (225).

3. The ultra-precision machining equipment as described in claim 2, characterized in that: The tool holder (24) is elastic, and the moving frame (21) is also provided with a first pressing mechanism (23). The first pressing mechanism (23) includes a first telescopic member (231). The telescopic end of the first telescopic member (231) is provided with a pressing plate (232). The pressing plate (232) is positioned above the connecting seat (224) and is used to press the tool holder (24) to drive the rigid grinding wheel (25) to abut or disengage from the surface of the middle part (41) of the roller (4).

4. The ultra-precision machining equipment as described in claim 3, characterized in that: The first telescopic component (231) is a cylinder telescopic mechanism.

5. The ultra-precision machining equipment as described in claim 3, characterized in that: The top pressure plate (232) is positioned above the connecting seat (224), and the connecting seat (224) is provided with a positioning groove (226) for fitting and engaging the top pressure plate (232). The side wall of the top pressure plate (232) is slidably connected to the inner wall of the positioning groove (226).

6. The ultra-precision machining equipment as described in claim 1, characterized in that: The drive wheel assembly (35) includes a first wheel body (351), a second wheel body (352), and a contact wheel (353) for contacting the end (42) of the roller (4). One end of the flexible sanding belt (36) is wound around the first wheel body (351), and the other end of the flexible sanding belt (36) passes through the contact wheel (353) and is finally connected in series to the second wheel body (352). The first wheel body (351) is connected to a brake disc (355) for applying rotational resistance to the first wheel body (351). The second wheel body (352) is connected to a second motor (354) for driving the second wheel body (352) to rotate. The elastic grinding surface (32) is defined on the outer surface of the flexible sanding belt (36) passing through the contact wheel (353).

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