An apparatus for abrasive flow machining of bearing inner ring surfaces

Abstract

A device for abrasive flow machining of the inner ring surface of a bearing comprises a worktable, an abrasive supply section, a workpiece processing container section, a workpiece clamping section, a motor drive section, an abrasive outflow and recovery section, a pipeline assembly section, and a push-button switch section. Its features include: the abrasive supply section and the processing container section are mounted on the worktable; the workpiece clamping section is installed inside the workpiece processing container; the motor drive section is mounted on the worktable; the push-button switch section is mounted on the worktable; the abrasive outflow and recovery section is mounted on the worktable; and pipelines connect the abrasive supply section, the workpiece processing container section, and the abrasive outflow and recovery section. This invention effectively overcomes the current problem of fixed abrasive flow precision machining of the inner ring surface of bearings. It utilizes a hydraulic pump to deliver abrasive, causing the abrasive to flow around the workpiece, while the motor rotates simultaneously, thereby polishing the workpiece surface. The resulting surface finish is excellent, significantly improving processing efficiency.

Description

Technical Field

[0001] This invention relates to the field of abrasive flow machining technology, specifically to a device for abrasive flow machining of the inner ring surface of a bearing. Background Technology

[0002] Bearings are widely used in aerospace, automotive, and military industries, and their surface quality directly affects the performance of the entire component or machine. Due to the small size and difficulty in clamping the bearing inner ring, traditional machining methods struggle to achieve a smooth finish. Extensive research has demonstrated that Abrasive Flow Machining (AFM) technology can significantly improve the surface quality of bearing inner rings. This invention focuses on bearing inner rings and researches precision polishing equipment using AFM. Bearings are crucial components in the machinery industry; the rotational motion of machinery is inseparable from bearings, and their operation directly impacts the performance of the entire system. Bearing inner rings are characterized by high hardness, low surface roughness, and a smooth surface. According to the data obtained, polishing the surface of bearing inner rings using traditional machining methods is quite difficult; AFM technology provides an effective solution to this problem.

[0003] The biggest difference between abrasive flow polishing and conventional cutting is the random distribution of the shape, size, and arrangement of the abrasive particles in the polishing fluid. The way a single abrasive particle contacts the workpiece is also random. If we consider a single abrasive particle as a small cutting tool, the rake angle of the cutting part could be positive, zero, or negative, and the angles of other cutting parts are also randomly distributed. During abrasive flow polishing, the abrasive particles in the polishing fluid interact with the workpiece surface under the pressure and flow rate. The cutting action is generated depending on the pressure of the abrasive flow polishing. If the pressure is too low, the abrasive particles only contact the workpiece, resulting in elastic deformation that cannot be removed. If the abrasive particles act on the workpiece surface with greater force and a larger rake angle, causing the protruding parts of the workpiece to reach the material's fracture limit, the micro-protrusions will be removed, forming chips that are carried away by the polishing fluid, effectively improving the workpiece surface quality. Summary of the Invention

[0004] To address the above shortcomings, the present invention provides an apparatus for abrasive flow machining of the inner ring surface of a bearing.

[0005] This invention is achieved through the following technical solution: an apparatus for abrasive flow machining of the inner ring surface of a bearing, comprising a worktable, an abrasive supply section, a workpiece processing container section, a workpiece clamping section, a motor drive section, an abrasive recovery section, a pipeline section, and a push-button switch section. The abrasive supply section is mounted on the worktable, the processing container section is mounted on the worktable, the workpiece clamping section is mounted inside the workpiece processing container, the motor drive section is mounted on the worktable, the push-button switch section is mounted on the worktable, the abrasive recovery section is mounted on the worktable, and a pipeline connects the abrasive supply section, the workpiece processing container section, and the abrasive recovery section. The abrasive supply section comprises an abrasive supply box, a first pipeline, a first hydraulic pump, a second pipeline, and fixing bolts. The abrasive supply box is connected to the worktable by bolts, the first hydraulic pump is connected to the worktable by bolts, the abrasive supply box and the first hydraulic pump are connected by the first pipeline, and the first hydraulic pump is connected to the workpiece processing container section by the second pipeline.

[0006] Furthermore, as a preferred embodiment, the workpiece processing container part is composed of a processing container, a processing container cover, and a sealing ring. The processing container is connected to the worktable by bolts, the processing container cover is connected to the processing container by bolts, and the sealing ring is connected to the pre-reserved sealing ring groove of the processing container by interference fit.

[0007] Furthermore, as a preferred embodiment, the workpiece clamping section comprises a rotating shaft, bearings, upper bearing gaskets, lower bearing gaskets, bearing spacers, spacer locking nuts, a workpiece placement rotary table, a three-way slider base, a square-headed base connector, a cylindrical guide connector, a movable ring, a slider, a pressure head, a pressure head rubber sleeve, a moving support rod, a slider connector, a pin, a workpiece sealing cover, a workpiece sealing cover gasket, and extended tightening bolts. The workpiece clamping section is placed in a workpiece processing container. The bearings are installed in the pre-drilled mounting holes in the processing container via an interference fit. The rotating shaft is connected to the bearings via an interference fit. The upper and lower bearing gaskets are installed on the upper and lower surfaces of the bearing, respectively, and simultaneously in the pre-drilled mounting holes in the processing container. The bushing is fitted onto the rotating shaft with a clearance fit, contacting the upper bearing gasket. The spacer locking nut is tightened using the bearing's own threads to secure the bushing. The workpiece is placed on a rotating table and fixed to the rotating shaft by threads. The three-way slider base is placed on the workpiece placing rotating table. The square head connector of the base is pressed and centered. The three-way slider base is fixed to the rotating shaft by threads and pre-drilled thread holes. The movable ring is fitted onto the cylindrical guide connector with clearance fit. The cylindrical guide connector is connected to the square head connector of the base by threads and pre-drilled thread holes. The moving support rod is connected to the movable ring by a pin. The pin is fixed to the movable ring by a snap ring. The slider connector is connected to the moving support rod by threads. The slider and the slider connector are connected by the slider connector's own shaft. The pressure head is connected to the slider by bolts. The pressure head sleeve is connected to the pressure head by an interference fit. The workpiece sealing cover is pressed onto the workpiece. The workpiece sealing cover gasket is placed in the workpiece sealing cover's pre-drilled groove by an interference fit. The extended tightening bolt is connected to the cylindrical guide connector by threads.

[0008] Furthermore, as a preferred embodiment, the motor transmission part is composed of a motor, a motor pulley, a synchronous belt, a bearing pulley, a key, a rotating shaft pad, and fastening bolts. The motor and the motor pulley are connected by an interference fit, the rotating shaft pulley is connected to the rotating shaft by a key, the key is placed in a reserved keyway on the rotating shaft, the bearing base plate is tightened to the rotating shaft by fastening bolts, and the synchronous belt is sleeved on the motor pulley and the rotating shaft pulley.

[0009] Furthermore, as a preferred embodiment, the abrasive recovery section is composed of pipe three, pipe four, hydraulic pump two, and abrasive recovery box. The processing container is connected to hydraulic pump two via pipe three, hydraulic pump two is connected to the worktable via a thread, the abrasive recovery box is connected to the worktable via a thread, and hydraulic pump two is connected to the abrasive recovery box via pipe four.

[0010] Furthermore, as a preferred embodiment, the pipeline section is composed of Pipeline 1, Pipeline 2, Pipeline 3, and Pipeline 4, wherein Pipeline 1 connects the abrasive supply box and hydraulic pump 1, Pipeline 2 connects hydraulic pump 1 and processing container section, Pipeline 3 connects processing container section and hydraulic pump 2, and Pipeline 4 connects hydraulic pump 2 and abrasive recovery box.

[0011] Furthermore, as a preferred embodiment, the push-button switch section consists of a start switch and an emergency stop switch, wherein the start switch is connected to the workbench via a pre-drilled threaded hole and a bolt, and the emergency stop switch is connected to the workbench via a pre-drilled threaded hole and a bolt. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the overall structure of an apparatus for abrasive flow machining of the inner ring surface of a bearing.

[0013] Figure 2 A top view of the clamping portion of an apparatus for abrasive flow machining of the inner ring surface of a bearing.

[0014] Figure 3 A top view of an apparatus for abrasive flow machining of the inner ring surface of a bearing.

[0015] Figure 4 Schematic diagram of the workpiece clamping part

[0016] Figure 5 A structural diagram of the specific clamping parts.

[0017] Figure 6 Schematic diagram of the slider mounting section for clamping specific parts

[0018] Figure 7 A schematic diagram of the motor drive section.

[0019] Figure 8 A schematic diagram of the processing container section.

[0020] Figure 9 Cross-sectional view of the processing container

[0021] In the diagram: 1—Workbench; 2—Abrasive supply box; 3—Pipe 1; 4—Hydraulic pump 1; 5—Pipe 2; 6—Machining container section; 601—Machining container cover; 602—Sealing ring; 603—Machining container; 7—Emergency stop switch; 8—Motor drive section: 801—Motor; 802—Motor pulley; 803—Synchronous belt; 804—Key; 805—Rotating shaft pulley; 806—Rotating shaft pad; 807—Fastening bolt; 9—Pipe 3; 10—Hydraulic pump 2; 11—Pipe 4; 12—Abrasive recovery box; 13—Start switch; 14—Workpiece clamping section; 1401—Extended tightening bolt; 1402—Workpiece seal 1403—Workpiece sealing cover; 1404—Clamping part; 14041—Slider; 14042—Indenter rubber sleeve; 14043—Indenter; 14044—Moving support rod; 14045—Moving ring; 14046—Cylindrical guide connector; 14047—Pin; 14048—Slider connector; 1405—Base square head connector; 1406—Three-way slider base; 1407—Workpiece placement rotary table; 1408—Spacer locking nut; 1409—Bearing spacer; 1410—Upper bearing gasket; 1411—Bearing; 1412—Lower bearing gasket; 1413—Rotating shaft. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to specific embodiments and accompanying drawings. It should be understood that these descriptions are merely exemplary and not intended to limit the scope of the invention. Furthermore, descriptions of well-known structures and technologies are omitted in the following description to avoid unnecessarily obscuring the concept of the invention. Other embodiments obtained by those skilled in the art without inventive effort are all within the scope of protection of this invention.

[0023] This invention mainly consists of eight parts, namely a worktable, an abrasive supply section, a workpiece processing container section, a workpiece clamping section, a motor drive section, an abrasive recovery section, a pipeline section, and a push-button switch section. The specific installation steps are as follows:

[0024] Step 1: Install the workbench. The workbench (1) has threaded holes and reserved openings. The abrasive supply box (2), hydraulic pump one (4), emergency stop switch (7), hydraulic pump two (10), abrasive recovery box (12), and start switch (13) are fixed to the reserved threaded holes of the workbench (1) by bolts, thereby completing the initial installation of the workbench (1).

[0025] Step 2: Install the processing container part. The processing container part (6) is composed of a processing container cover (601), a sealing ring (602), and a processing container (603). The processing container (603) is fixed to the threaded hole on the worktable (1) by bolts. The sealing ring (602) and the processing container (603) are interference-fitted with the reserved groove. The processing container cover (601) and the processing container (603) are fixed to each other by bolts.

[0026] Step 3: Install the specific parts for clamping the workpiece. The specific parts for clamping the workpiece (1404) are composed of a slider (14041); a pressure head sleeve (14042); a pressure head (14043); a moving support rod (14044); a movable ring (14045); a cylindrical guide connector (14046); a pin (14047); and a slider connector (14048). The pressure head (14043) and the slider (14041) are fixed together by bolts. The pressure head sleeve (14042) is fitted onto the pressure head (14043) with an interference fit. The assembled slider (14041) is installed with a clearance fit through the connecting rod of the slider connector (14048). The slider connector (14048) is connected to the moving support rod (14044) through the guide boss and fixed by bolts. The moving support rod (14044) is installed and connected to the movable ring (14045) through the pin (14047). The movable ring (14045) is connected to the cylindrical guide connector (14046) with a clearance fit and can slide up and down along the cylindrical guide connector (14046).

[0027] Step 4: Install the workpiece clamping part. The workpiece clamping part (14) consists of an extended tightening bolt (1401), a workpiece sealing cover gasket (1402), a workpiece sealing cover (1403), a clamping body (1404), a base square head connector (1405), a three-way slider base (1406), a workpiece placement rotary table (1407), a spacer locking nut (1408), a bearing spacer (1409), an upper bearing sealing gasket (1410), a bearing (1411), a lower bearing sealing gasket (1412), and a rotating... The shaft (1413) consists of a lower bearing seal (1412) installed in the pre-reserved bearing mounting hole of the machining container (603), a bearing (1411) installed with an interference fit in the pre-reserved mounting hole of the machining container (603), a rotating shaft (1413) and a bearing (1411) installed with an interference fit, an upper bearing seal (1410) installed on the upper surface of the bearing (1411), a bearing spacer (1409) fitted with a clearance fit on the bearing (1411), and a spacer lock nut (1408) passing through the shaft. The bearing (1411) with its own threaded tightening mechanism presses the bearing spacer (1409) against the bearing seal (1410). The workpiece placement rotary table (1407) is tightened and fixed to the rotating shaft (1413) by threads. The three-way slider base (1406) is installed on the workpiece placement rotary table (1407). The base square head connector (1405) is tightened and fixed to the three-way slider base (1406) through the threaded hole on the upper end face of the rotating shaft (1413). The workpiece clamping part (1404) is installed on the three-way slider base. Simultaneously, the slider (14041) on the base (1406) is aligned with the track on the three-way slider base (1406). The cylindrical guide connector (14046) is tightened and fixed to the square head connector (1405) of the base through threads. The sealing gasket (1402) of the workpiece sealing cover is installed through the pre-reserved groove of the workpiece sealing cover (1403) with interference fit. The extended tightening bolt (1401) is tightened and fixed to the workpiece sealing cover (1403) on the workpiece through the threaded hole of the cylindrical guide connector (14046) through threads.

[0028] Step 5: Install the motor drive component. The motor drive component (8) consists of a motor (801), a motor pulley (802), a synchronous belt (803), a key (804), a rotating shaft pulley (805), a rotating shaft pad (806), and fastening bolts (807). The motor pulley (802) is installed with the motor (801) through an interference fit. The key (804) is installed in the keyway of the rotating shaft (1413). The rotating shaft pulley (805) is installed with the rotating shaft (1413) through the key (804). The rotating shaft pad (806) is installed at the bottom of the rotating shaft (1413). The fastening bolts (807) are threaded onto the rotating shaft (1413) to tighten and fix the rotating shaft pad (806). The motor (801) is installed and fixed through the threaded hole reserved in the worktable (1).

[0029] Step Six: Install the piping section. The piping section consists of Pipe One (3), Pipe Two (5), Pipe Three (9), and Pipe Four (11). Pipe One (3) connects the abrasive supply box (2) and Hydraulic Pump One (4), Pipe Two (5) connects Hydraulic Pump One (4) and Processing Container Section (6), Pipe Three (9) connects Processing Container Section (6) and Hydraulic Pump Two (10), and Pipe Four (11) connects Hydraulic Pump Two (10) and Abrasive Recovery Box (12).

[0030] When this device is in operation, place it vertically and follow these steps:

[0031] In the initial state, open the processing container cover (601), place the workpiece onto the workpiece placement rotary table (1407), tighten the cylindrical guide connector (14046) downwards, so that the cylindrical guide connector (14046) presses the movable ring (14045) downwards, and at the same time the slider (14041) squeezes and clamps the workpiece against the inner wall of the workpiece through the track of the three-way slider base (1406), press the workpiece sealing cover (1403) onto the workpiece and tighten it by tightening the extended tightening bolt (1401), and tighten the processing container cover (601) and the processing container (603) with bolts through the threaded holes at both ends.

[0032] After the workpiece is installed, press the start switch (13). The hydraulic pump (4) starts working and draws abrasive from the abrasive supply box (2) through pipe (3). It is then transported to the processing container (6) through pipe (5). At the same time, the motor (801) drives the synchronous belt (803), which drives the rotating shaft (1413) to start rotating. The workpiece rotates with the rotating shaft (1413). After processing, the abrasive flows into the bottom of the processing container (6). The hydraulic pump (10) draws out the excess abrasive through pipe (9) and transports it to the abrasive recovery box (12) through pipe (11).

[0033] For those skilled in the art, any changes, modifications, substitutions, and variations made to the embodiments without departing from the principles and spirit of the present invention, based on the teachings of the present invention, still fall within the protection scope of the present invention.

Claims

1. An apparatus for abrasive flow machining of the inner ring surface of a bearing, comprising a worktable, an abrasive supply section, a workpiece machining container section, a workpiece clamping section, a motor drive section, an abrasive recovery section, a pipeline section, and a push-button switch section, characterized in that: The abrasive supply section is mounted on the worktable, the processing container section is mounted on the worktable, the workpiece clamping section is mounted inside the workpiece processing container, the motor drive section is mounted on the worktable, the push-button switch section is mounted on the worktable, and the abrasive recovery section is mounted on the worktable. Pipelines connect the abrasive supply section, the workpiece processing container section, and the abrasive recovery section. The abrasive supply section consists of an abrasive supply box, a first pipe, a first hydraulic pump, a second pipe, and fixing bolts. The abrasive supply box is connected to the worktable by bolts, and the first hydraulic pump is connected to the worktable by bolts. Hydraulic pump one is connected via pipe one, and hydraulic pump one is connected to the workpiece processing container via pipe two. The workpiece clamping part consists of a rotating shaft, bearings, upper bearing gasket, lower bearing gasket, bearing spacer, spacer lock nut, workpiece placement rotary table, three-way slider base, base square head connector, cylindrical guide connector, movable ring, slider, pressure head, pressure head rubber sleeve, moving support rod, slider connector, pin, workpiece sealing cover, workpiece sealing cover sealing gasket, and extended tightening bolt. The workpiece clamping part is placed in the workpiece processing container, and the bearings are installed in the processing container via interference fit. The container has pre-drilled mounting holes. The rotating shaft is connected to the bearing via an interference fit. The upper and lower bearing gaskets are installed on the upper and lower surfaces of the bearing, respectively, and simultaneously installed in the pre-drilled mounting holes of the processing container. The bushing is fitted with a clearance fit on the rotating shaft, contacting the upper bearing gasket. The spacer lock nut is tightened via the bearing's own threads to secure the bushing. The workpiece is placed on the rotating table and secured to the rotating shaft via threads. The three-way slider base is placed on the workpiece rotating table. The square-head connector of the base is pressed and aligned. The three-way slider base is secured to the rotating shaft via threads via pre-drilled threaded holes. The movable ring is fitted with a clearance fit on the rotating shaft. On the column guide connector, the cylindrical guide connector is screwed to the pre-reserved threaded hole of the square connector on the base through threads. The moving support rod is connected to the movable ring through a pin. The pin is fixed to the movable ring by a snap ring. The slider connector is connected to the moving support rod through threads. The slider and the slider connector are connected through the slider connector's own shaft. The pressure head is connected to the slider through bolts. The pressure head rubber sleeve is connected to the pressure head through an interference fit. The workpiece sealing cover is pressed onto the processed workpiece. The workpiece sealing cover gasket is placed in the pre-reserved groove of the workpiece sealing cover through an interference fit. The extended tightening bolt is connected to the cylindrical guide connector through threads.

2. The apparatus for abrasive flow machining of the inner ring surface of a bearing as described in claim 1, characterized in that: The workpiece processing container consists of a processing container, a processing container cover, and a sealing ring. The processing container is connected to the worktable by bolts, the processing container cover is connected to the processing container by bolts, and the sealing ring is connected to the pre-reserved sealing ring groove of the processing container by interference fit.

3. The apparatus for abrasive flow machining of the inner ring surface of a bearing as described in claim 1, characterized in that: The motor transmission part consists of a motor, a motor pulley, a synchronous belt, a rotating shaft pulley, a key, a rotating shaft pad, and fastening bolts. The motor and the motor pulley are connected by an interference fit. The bearing pulley is connected to the bearing by a key, which is placed in a reserved keyway in the rotating shaft. The bearing base plate is tightened to the rotating shaft by fastening bolts. The synchronous belt is fitted on the motor pulley and the rotating shaft pulley.

4. The apparatus for abrasive flow machining of the inner ring surface of a bearing as described in claim 1, characterized in that: The abrasive recovery section consists of pipe three, pipe four, hydraulic pump two, and abrasive recovery box. The processing container is connected to hydraulic pump two via pipe three, hydraulic pump two is connected to the worktable via a thread, the abrasive recovery box is connected to the worktable via a thread, and hydraulic pump two is connected to the abrasive recovery box via pipe four.

5. The apparatus for abrasive flow machining of the inner ring surface of a bearing as described in claim 1, characterized in that: The pipeline section consists of Pipeline 1, Pipeline 2, Pipeline 3, and Pipeline 4. Pipeline 1 connects the abrasive supply box to Hydraulic Pump 1, Pipeline 2 connects Hydraulic Pump 1 to the processing container, Pipeline 3 connects the processing container to Hydraulic Pump 2, and Pipeline 4 connects Hydraulic Pump 2 to the abrasive recovery box.

6. The apparatus for abrasive flow machining of the inner ring surface of a bearing as described in claim 1, characterized in that: The push-button switch consists of a start switch and an emergency stop switch. The start switch and the emergency stop switch are connected by bolts through a pre-drilled threaded hole on the worktable.

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