Clamping tool and processing method for machining gear pump bearing closed oil groove and inclined oil passage hole

Abstract

This invention discloses a clamping fixture and machining method for machining the closed oil groove and inclined oil passage hole of a gear pump bearing. A semi-cylindrical concave surface with a horizontal axis is provided on the base. The semi-cylindrical mounting block includes a semi-cylindrical surface and a mounting plane. The semi-cylindrical surface and the semi-cylindrical concave surface are slidably connected by a first sliding structure. The semi-cylindrical mounting block can reciprocate along the circumference of the semi-cylindrical concave surface. The bearing positioning and orientation assembly includes a bearing radial positioning column, a bearing axial positioning component, and a bearing orientation block, all disposed on the mounting plane. The bearing orientation block is slidably connected to the mounting plane by a second sliding structure. The acute angle formed by the sliding direction of the bearing orientation block and the axis of the semi-cylindrical concave surface is complementary to the cross-sectional angle of the bearing. The cross-sectional angle refers to the angle formed by a first tangent plane coinciding with the bearing axis and a second tangent plane. The first tangent plane is the tangent plane that evenly divides the side plane of the bearing, and the second tangent plane is the tangent plane that evenly divides the closed oil groove of the bearing. This invention can be completed using a three-axis machine, which greatly reduces the equipment cost of bearing production, alleviates the shortage of five-axis machine tools, and improves the adjustability and controllability of on-site production arrangements.

Description

Technical Field

[0001] This invention belongs to the field of gear pump bearing processing technology in aero-engine fuel accessories, specifically relating to a clamping fixture and processing method for processing the closed oil groove and inclined oil passage hole of a gear pump bearing. Background Technology

[0002] The gear pump in an aircraft engine's fuel control system, as a key component for fuel supply, directly impacts the engine's overall operating efficiency through its performance and reliability. Gear pumps typically employ paired fixed and floating bearings to support and guide gear rotation, reduce frictional losses, and ensure efficient fuel delivery. These bearings, such as... Figure 1 and Figure 2 As shown, both the fixed driven bearing and the fixed driving bearing (referred to as bearing a for ease of understanding) exhibit a high degree of structural similarity, and their designs display mirror symmetry. Each bearing a includes an inner bore b, a side plane c, a closed oil groove d formed on the inner bore wall, and an inclined oil passage e located within the closed oil groove d. The main function of the closed oil groove d is to store lubricating oil, ensuring that the bearing support parts are adequately lubricated, thereby extending service life and improving operational stability.

[0003] The existing machining method for the closed oil groove d and the inclined oil passage hole e of this type of bearing involves the following steps: Since the closed oil groove d and the inclined oil passage hole e are double-angle spatial inclined grooves and inclined holes, a five-axis machining center must be used. The bearing's outer circle and end face are used as clamping references, the side plane c is used for orientation, and the machine tool's rotation function is used to rotate the part, eliminating a certain angle and avoiding interference. Then, a suitable ball end mill is used to mill the closed oil groove d, and finally, the inclined oil passage hole e is drilled. Although this machining method ensures the machining accuracy of the bearing's closed oil groove d and inclined oil passage hole e, it has several drawbacks. It requires a five-axis machining center, which is a high-end machine tool with high costs. Furthermore, many production workshops lack five-axis machines. Using this method is not only costly and cumbersome for workers, but it also leads to significant equipment occupation, hindering flexible production arrangements and resulting in low production efficiency. These drawbacks are particularly pronounced in large-scale bearing production, severely restricting workshop production. Summary of the Invention

[0004] To address the problems existing in the prior art, this invention provides a clamping fixture and machining method for machining the closed oil groove and inclined oil passage hole of a gear pump bearing. The machining can be completed using a three-axis machine, which greatly reduces the equipment cost of bearing production, alleviates the shortage of five-axis machine tool resources, and improves the adjustability and controllability of on-site production arrangements.

[0005] To solve the above-mentioned technical problems, the present invention is achieved through the following technical solution: According to a first aspect of the present invention, a clamping fixture for machining a gear pump bearing closed oil groove and inclined oil passage hole is provided, comprising: The base has a semi-cylindrical concave surface with a horizontal axis. A semi-cylindrical mounting block, comprising a semi-cylindrical surface and a mounting plane, wherein the semi-cylindrical surface and the semi-cylindrical concave surface are slidably connected by a first sliding structure, and the semi-cylindrical mounting block is capable of reciprocating rotation along the circumference of the semi-cylindrical concave surface. A bearing positioning and orientation assembly includes a bearing radial positioning post, a bearing axial positioning member, and a bearing orientation block disposed on the mounting plane. The bearing orientation block is slidably connected to the mounting plane via a second sliding structure. The acute angle formed by the sliding direction of the bearing orientation block and the axis of the semi-cylindrical concave surface is complementary to the cross-sectional angle of the bearing. The cross-sectional angle refers to the angle formed by a first sectional plane and a second sectional plane that coincide with the bearing axis. The first sectional plane is a sectional plane that divides the side plane of the bearing equally, and the second sectional plane is a sectional plane that divides the closed oil groove of the bearing equally.

[0006] In one possible implementation of the first aspect, the first sliding structure includes a T-shaped groove formed circumferentially on the semi-cylindrical surface near both ends, a first T-shaped guide block fixedly disposed in the concave surface of the semi-cylindrical surface, a second T-shaped guide block movably disposed in the concave surface of the semi-cylindrical surface, and a locking module cooperating with the second T-shaped guide block, wherein each T-shaped groove has a first T-shaped guide block and a second T-shaped guide block slidably engaged.

[0007] In one possible implementation of the first aspect, the end of the second T-shaped guide block away from the concave surface of the semi-cylindrical surface extends out of the side of the base, and the extended portion is provided with external threads. The locking module is a first adjusting nut, which is engaged with the external threads on the second T-shaped guide block.

[0008] In one possible implementation of the first aspect, an axial positioning component is provided on each side of the radial positioning post of the bearing. The axial positioning component includes a pressure plate, a support post and a stud fixed on the mounting plane, and a second adjusting nut that cooperates with the stud. The stud is located between the support post and the radial positioning post of the bearing. A through hole is provided on the pressure plate. One end of the pressure plate is placed on the upper end of the support post, and the other end of the pressure plate is used to press on the upper end of the bearing. The upper end of the stud passes through the through hole and is connected to the second adjusting nut.

[0009] In one possible implementation of the first aspect, the second sliding structure includes a guide block mounting groove formed on the mounting plane, a guide block fixed in the guide block mounting groove and protruding from the guide block mounting groove, a locking assembly connected to the upper end face of the guide block, and a strip groove formed on the bearing orientation block, the strip groove being slidably fitted on the guide block, and the locking assembly being used to lock the bearing orientation block.

[0010] In one possible implementation of the first aspect, the locking assembly includes a screw fixed to the upper end face of the guide slider and a third adjusting nut fitted on the screw. The upper end of the screw extends out of the strip groove and engages with the third adjusting nut, which is used to press against the bearing orientation block.

[0011] In one possible implementation of the first aspect, the bearing radial positioning post has positioning steps of different diameters on its cylindrical surface.

[0012] In one possible implementation of the first aspect, one end of the semi-cylindrical mounting block is provided with an angle scale line, and a pointer is correspondingly provided on the base.

[0013] In one possible implementation of the first aspect, the base is provided with a mounting boss for mating and connecting with a machining center tooling table.

[0014] According to a second aspect of the present invention, a method for machining a closed oil groove and oblique oil passage hole of a gear pump bearing is provided. The bearing is clamped using the aforementioned clamping fixture for machining the closed oil groove and oblique oil passage hole of a gear pump bearing, and then machined on a three-axis machining center. The machining method includes: Install the inner hole b of the bearing on the radial positioning post of the bearing, rotate the bearing so that its side plane is aligned with the bearing orientation block, then use the bearing orientation block to press against the side plane, and then use the bearing axial positioning component to axially position the bearing. After rotating the semi-cylindrical mounting block to a set angle, the semi-cylindrical mounting block is fixed, and the closed oil groove is machined by feeding downward through the Z-axis milling cutter of the three-axis machining center; wherein, the set angle refers to the angle formed between the Z-axis milling cutter and the axis of the bearing when the Z-axis milling cutter head is located at the lower end of the closed oil groove and the Z-axis milling cutter does not interfere with the upper end of the inner hole, and the set angle is an angle obtained by prior testing; After the closed oil groove is machined, the inclined oil passage hole is machined by the Z-axis drilling tool of the three-axis machining center.

[0015] Compared with the prior art, the present invention has at least the following beneficial effects: This invention provides a clamping fixture for machining the closed oil groove and inclined oil passage hole of a gear pump bearing. Using this fixture, the closed oil groove and inclined oil passage hole of the bearing can meet the positioning conditions for machining on a three-axis machining center. By utilizing the acute angle formed by the sliding direction of the bearing guide block and the axis of the semi-cylindrical concave surface, which is complementary to the bearing's cross-sectional angle, and the rotation of the semi-cylindrical mounting block, the bearing is rotated in a specific manner, eliminating certain spatial angles. Specifically, setting the bearing cross-sectional angle as α, and the angle between the tool and the bearing axis after rotation as rotation angle β, using the clamping fixture provided by this invention to rotate and position the bearing according to the intersection of α and β, then using a suitable ball end mill, a straight cutter from the upper end to the lower end of the closed oil groove can achieve qualified machining of the closed oil groove on a three-axis machine tool; using a suitable drilling tool, qualified machining of the inclined oil passage hole can be achieved, thus enabling the machining of the bearing's closed oil groove and inclined oil passage hole on a three-axis machine tool. In other words, with the help of the clamping device of the present invention, the processing of the bearing closed oil groove and inclined oil passage hole can be completed directly using a three-axis machine, which greatly reduces the equipment cost of bearing production, alleviates the shortage of five-axis machine tool resources, and the tooling is highly versatile. Only one set of tooling needs to be made, which can be applied to most bearing processing. The bearing can be directly clamped and positioned by single-piece alignment, which improves the clamping efficiency by more than 90%. While ensuring the processing quality, it greatly reduces the operation difficulty of workers and improves the adjustability and controllability of on-site production arrangements.

[0016] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the specific embodiments of the present invention, the drawings used in the description of the specific embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0018] Figure 1 A schematic diagram of a pair of gear pump bearings manufactured according to the present invention; Figure 2 for Figure 1 Schematic diagram of the closed oil groove and inclined oil passage hole structure of the intermediate bearing; Figure 3 This is a schematic diagram of the rotational angle of a bearing during machining on a three-axis machining center. Figure 4 This is a schematic diagram of a clamping fixture for machining a gear pump bearing closed oil groove and inclined oil passage hole according to an embodiment of the present invention; Figure 5This is a schematic diagram of the semi-cylindrical surface structure of the semi-cylindrical mounting block in a clamping fixture for machining a gear pump bearing closed oil groove and inclined oil passage hole according to an embodiment of the present invention. Figure 6 This is a schematic diagram of the semi-cylindrical concave surface structure of the base of a clamping fixture for machining a gear pump bearing closed oil groove and inclined oil passage hole according to an embodiment of the present invention. Figure 7 This is a schematic diagram of the back structure of the base in a clamping fixture for machining a gear pump bearing closed oil groove and inclined oil passage hole according to an embodiment of the present invention; Figure 8 This is a schematic diagram of the positioning and orientation of a gear pump bearing using a clamping fixture for machining a closed oil groove and inclined oil passage hole, according to an embodiment of the present invention. Figure 9 for Figure 8 BB cross-sectional view; Figure 10 for Figure 8 CC section view; Figure 11 This is a schematic diagram of the clamping method for a three-axis machining center.

[0019] In the diagram: 1-Base; 101-Semi-cylindrical concave surface; 102-Pointer; 103-Mounting boss; 104-Clamping reference hole; 2-Semi-cylindrical mounting block; 201-Semi-cylindrical surface; 202-Mounting plane; 203-Angle scale line; 3-First sliding structure; 301-T-shaped groove; 302-First T-shaped guide block; 303-Second T-shaped guide block; 304-Locking module; 4-Bearing positioning and orientation assembly; 401-Bearing radial positioning post; 402-Bearing axial positioning component; 4020-Pressure plate; 4021-Support post; 4022-Stud; 4023-Second adjusting nut; 403-Bearing orientation block; 5-Second sliding structure; 501-Guide block mounting groove; 502-Guide slider; 503-Strip groove; 504-Screw; 505-Third adjusting nut; 6-Cut tool. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] Combination Figures 4 to 10As shown, this embodiment of the invention provides a clamping fixture for machining the closed oil groove and inclined oil passage hole of a gear pump bearing. The purpose of this fixture is to solve the high cost and operational complexity associated with high-precision machining using a five-axis machining center in the prior art. The clamping fixture includes a base 1, a semi-cylindrical mounting block 2, and a bearing positioning and orientation assembly 4. The base 1 has a semi-cylindrical concave surface 101 with a horizontal axis. The semi-cylindrical mounting block 2 includes a semi-cylindrical surface 201 and a mounting plane 202. The semi-cylindrical surface 201 and the semi-cylindrical concave surface 101 are slidably connected by a first sliding structure 3, and the semi-cylindrical mounting block 2 can reciprocate along the circumference of the semi-cylindrical concave surface 101. The bearing positioning and orientation assembly 4 includes a bearing radial positioning post 401, a bearing axial positioning component 402, and a bearing orientation block 403 disposed on the mounting plane 202. The bearing orientation block 403 is slidably connected to the mounting plane 202 through a second sliding structure 5. The acute angle formed by the sliding direction of the bearing orientation block 403 and the axis of the semi-cylindrical concave surface 101 is complementary to the cross-sectional angle of the bearing a.

[0022] Combination Figure 3 As shown, the sectional angle refers to the angle α formed by the first sectional plane and the second sectional plane that coincide with the axis of bearing a. The first sectional plane refers to the sectional plane that divides the side plane c of bearing a into equal parts, and the second sectional plane refers to the sectional plane that divides the closed oil groove d of bearing a into equal parts.

[0023] Specifically, the base 1 is the main support structure of the entire clamping fixture. It has a semi-cylindrical concave surface 101 with a horizontal axis. The semi-cylindrical concave surface 101 is designed to cooperate with the semi-cylindrical mounting block 2 to achieve the rotational positioning of the bearing. The semi-cylindrical mounting block 2 is semi-cylindrical in shape, including a semi-cylindrical surface 201 and a mounting plane 202. The semi-cylindrical surface 201 and the semi-cylindrical concave surface 101 on the base 1 are slidably connected by a first sliding structure 3 (such as a dovetail groove, T-slot, or guide rail), ensuring that the semi-cylindrical mounting block 2 can reciprocate along the circumference of the semi-cylindrical concave surface 101, thereby achieving precise positioning of the bearing at different angles.

[0024] The bearing positioning and orientation assembly 4 is mounted on the mounting plane 202 of the semi-cylindrical mounting block 2. It includes a bearing radial positioning post 401, a bearing axial positioning component 402, and a bearing orientation block 403. The bearing radial positioning post 401 positions the inner hole b of the bearing a, ensuring the stability of the bearing a during machining. The bearing axial positioning component 402 axially positions the bearing a, preventing axial movement during machining. The bearing orientation block 403 is slidably connected to the mounting plane 202 via a second sliding structure 5. The acute angle formed by its sliding direction and the axis of the semi-cylindrical concave surface 101 is complementary to the cross-sectional angle of the bearing a. This design allows the side plane c of the bearing a and the inclined surface of the closed oil groove d to be precisely aligned with the machining tool.

[0025] After clamping the bearing a to be machined using this clamping fixture, it is machined on a three-axis machining center. The specific machining method is as follows: Install the inner hole b of bearing a on the bearing radial positioning post 401 to ensure that the bearing is stable and does not move. Rotate bearing a so that its side plane c is aligned with bearing orientation block 403, and use bearing orientation block 403 to press against side plane c to achieve precise orientation of the bearing, while ensuring that bearing a will not shift due to external force during processing. The bearing a is axially positioned using the bearing axial positioning component 402 to ensure that it does not move axially during processing. Based on the pre-tested set angle (i.e., the angle formed between the Z-axis milling tool and the axis of bearing a when the Z-axis milling tool head is located at the lower end of the closed oil groove d and does not interfere with the upper end of the inner hole b), rotate the semi-cylindrical mounting block 2 to the set angle and fix the semi-cylindrical mounting block 2 to ensure that it will not move during the machining process.

[0026] On a three-axis machining center, the Z-axis milling cutter feeds downwards and processes the closed oil groove d along a preset path. Due to the rotation and fixation of the semi-cylindrical mounting block 2, the Z-axis milling cutter will not interfere with the upper end of the inner hole b during the entire processing of the closed oil groove d, thus completing the processing. After the closed oil groove d is machined, it is replaced with a Z-axis drilling tool. The Z-axis drilling tool of the three-axis machining center is used to feed downwards and machine the inclined oil passage hole e along the preset path.

[0027] This invention enables machining using a three-axis machining center, avoiding the high cost of five-axis machining centers. Three-axis machining centers are more common in most workshops, reducing equipment downtime and improving production efficiency. Compared to five-axis machining, three-axis machining is simpler to operate, reducing the difficulty for workers. This invention provides greater flexibility and control in workshop production scheduling, and is particularly suitable for mass production of bearings. In summary, this invention provides a highly efficient, economical, and practical clamping fixture and machining method for machining closed oil grooves and inclined oil passage holes in gear pump bearings, possessing practical value.

[0028] In one feasible approach, combining Figure 5 , Figure 6 and Figure 7As shown, the first sliding structure 3 includes a T-shaped groove 301 formed along the circumference of the semi-cylindrical surface 20 near both ends, a first T-shaped guide block 302 fixedly disposed in the semi-cylindrical concave surface 101, a second T-shaped guide block 303 movably disposed in the semi-cylindrical concave surface 101, and a locking module 304 cooperating with the second T-shaped guide block 303. Each T-shaped groove 301 has a first T-shaped guide block 302 and a second T-shaped guide block 303 slidably fitted within it.

[0029] In other words, the first sliding structure 3 ensures that the semi-cylindrical mounting block 2 can rotate stably along the circumference of the semi-cylindrical concave surface 101 and lock in any position when needed. The T-shaped groove 301 is an elongated slot opened along the circumference of the semi-cylindrical surface 201 near its two ends. Its shape matches the T-shaped guide blocks (including the first T-shaped guide block 302 and the second T-shaped guide block 303) to provide guidance and support. The design of the T-shaped groove 301 ensures that it can slide freely relative to the T-shaped guide blocks while withstanding a certain lateral force to maintain stability.

[0030] The first T-shaped guide block 302 is a guide component fixedly installed in the concave surface 101 of the semi-cylindrical surface. Its shape matches the T-shaped groove 301 and is used to guide the rotational movement of the semi-cylindrical mounting block 2. Usually, at least one first T-shaped guide block 302 is set at one end of the T-shaped groove 301 to ensure the stability of the semi-cylindrical mounting block 2 during rotation.

[0031] The second T-shaped guide block 303 is a guide component movably disposed within the concave surface 101 of the semi-cylindrical structure. Similar to the first T-shaped guide block 302, its shape also matches the T-shaped groove 301. However, unlike the first T-shaped guide block 302, the second T-shaped guide block 303 can cooperate with the locking module 304 to lock the semi-cylindrical mounting block 2. The second T-shaped guide block 303 is typically spaced apart from the first T-shaped guide block 302 to ensure the reliability of the locking effect.

[0032] The locking module 304 is a locking component that cooperates with the second T-shaped guide block 303. It is used to apply locking force when needed to fix the second T-shaped guide block 303 at any position within the T-shaped slide groove 301, thereby locking the semi-cylindrical mounting block 2. The locking module 304 can be in the form of a bolt, nut, locking pin, etc.

[0033] Specifically, when it is necessary to control the semi-cylindrical mounting block 2 to rotate circumferentially along the semi-cylindrical concave surface 101, firstly, the locking module 304 is released, allowing the second T-shaped guide block 303 to release the restriction on the sliding freedom of the T-shaped groove 301. Then, the semi-cylindrical mounting block 2 is pushed, causing it to rotate circumferentially along the semi-cylindrical concave surface 101 under the guiding action of the T-shaped groove 301, the first T-shaped guide block 302, and the second T-shaped guide block 303. After rotating to the set position, the locking module 304 applies a locking force to the second T-shaped guide block 303, fixing the second T-shaped guide block 303 in its current position within the T-shaped groove 301. The locking force is transmitted to the semi-cylindrical mounting block 2, locking it and ensuring that it remains in its current position during processing.

[0034] This method allows the machining of the closed oil groove and oblique oil passage hole of the gear pump bearing to be completed on a three-axis machining center, greatly reducing production costs and improving production efficiency. At the same time, this clamping fixture also has the advantages of simple structure, convenient operation, and easy maintenance, making it suitable for gear pump bearing manufacturers of all sizes.

[0035] Preferred, combined Figure 9 As shown, the end of the second T-shaped guide block 303 away from the semi-cylindrical concave surface 101 extends out of the side of the base 1, and the extended part is provided with external threads. The locking module 304 is the first adjusting nut, and the first adjusting nut is engaged with the external threads on the second T-shaped guide block 303.

[0036] In other words, the second T-shaped guide block 303, in addition to having a shape that matches the T-shaped groove 301 to provide a guiding function, also extends out of the side of the base 1 at the end away from the semi-cylindrical concave surface 101. This design allows the protruding part of the second T-shaped guide block 303 to be easily connected to the locking module 304, realizing the locking and unlocking functions. An external thread is provided on the protruding part of the second T-shaped guide block 303, which matches the internal thread of the locking module 304 (in this embodiment, the first adjusting nut). By tightening the first adjusting nut, the second T-shaped guide block 303 can be adjusted and locked.

[0037] The locking module 304 adopts the form of a first adjusting nut, whose internal thread engages with the external thread on the second T-shaped guide block 303. The use of a first adjusting nut in the locking module 304 offers advantages such as ease of operation and reliable locking force. When it is necessary to control the circumferential rotation of the semi-cylindrical mounting block 2 along the concave surface 101 of the semi-cylindrical block, the second T-shaped guide block 303 can be adjusted to loosen or lock by turning the first adjusting nut. When the second T-shaped guide block 303 is loose, the semi-cylindrical mounting block 2 can rotate freely under the guiding action of the T-shaped slide 301 and the first T-shaped guide block 302; when the second T-shaped guide block 303 is locked, it applies a locking force to the T-shaped slide 301, thereby locking the semi-cylindrical mounting block 2.

[0038] Specifically, when it is necessary to control the circumferential rotation of the semi-cylindrical mounting block 2 along the concave surface 101 of the semi-cylindrical block, firstly, by tightening the first adjusting nut, the second T-shaped guide block 303 is loosened within the T-shaped groove 301, thereby releasing the locking force applied to the T-shaped groove 301. At this time, the semi-cylindrical mounting block 2 can freely rotate to the desired position under the guiding action of the T-shaped groove 301 and the first T-shaped guide block 302. After the semi-cylindrical mounting block 2 has rotated to the set position, by tightening the first adjusting nut in the opposite direction, the locking force of the second T-shaped guide block 303 is reapplied to the T-shaped groove 301, and the locking force is transmitted to the semi-cylindrical mounting block 2, thus locking the semi-cylindrical mounting block 2. At this time, the semi-cylindrical mounting block 2 will remain in its current position, providing stable support for subsequent processing operations.

[0039] In one feasible approach, combining Figure 4 and Figure 8 As shown, a bearing axial positioning component 402 is provided on both sides of the bearing radial positioning post 401. The bearing axial positioning component 402 includes a pressure plate 4020, a support post 4021 and a stud 4022 fixed on the mounting plane 202, and a second adjusting nut 4023 that cooperates with the stud 4022. The stud 4022 is located between the support post 4021 and the bearing radial positioning post 401. A through hole is provided on the pressure plate 4020. One end of the pressure plate 4020 is placed on the upper end of the support post 4021, and the other end of the pressure plate 4020 is used to press on the upper end of the bearing. The upper end of the stud 4022 passes through the through hole and is connected to the second adjusting nut 4023.

[0040] Specifically, the bearing axial positioning component 402 mainly consists of a pressure plate 4020, a support column 4021, a stud 4022, and a second adjusting nut 4023. The pressure plate 4020 is a flat plate with a certain strength and rigidity; one end of it contacts the bearing a and applies pressure to achieve axial positioning of the bearing. A through hole is provided on the pressure plate 4020 to accommodate the passage of the stud 4022, which cooperates with the second adjusting nut 4023 to adjust the position of the pressure plate 4020 in the vertical direction.

[0041] The support column 4021 is a columnar component fixed on the mounting plane 202, and its height and position are designed according to the size and positioning requirements of the bearing a. The upper end of the support column 4021 is used to support the other end of the pressure plate 4020, ensuring that the pressure plate 4020 remains stable when the second adjusting nut 4023 is tightened.

[0042] Stud 4022 is a cylindrical component with external threads. Its diameter and length are designed according to the through hole size of pressure plate 4020 and the positioning requirements of bearing a. Stud 4022 is located between support post 4021 and bearing radial positioning post 401. Its lower end can be fixed to mounting plane 202 (e.g., by welding, threaded connection, etc.), while its upper end passes through the through hole of pressure plate 4020 and is connected to the second adjusting nut 4023.

[0043] The second adjusting nut 4023 is a nut with internal threads that match the external threads of the stud 4022. By tightening the second adjusting nut 4023, the position of the pressure plate 4020 in the vertical direction can be adjusted, thereby achieving axial positioning of the bearing a.

[0044] After bearing a is oriented on mounting plane 202, firstly, one end of pressure plate 4020 needs to be placed on top of support column 4021 to ensure stability. Then, the other end of pressure plate 4020 is pressed against the top of bearing a, ensuring full contact between pressure plate 4020 and bearing a. Next, the pressure plate 4020 is pressed downwards by tightening the second adjusting nut 4023. Since stud 4022 is fixed to mounting plane 202, tightening the second adjusting nut 4023 will cause pressure plate 4020 to move downwards along stud 4022, applying pressure to bearing a. As the pressure increases, bearing a will be firmly pressed onto mounting plane 202, achieving axial positioning.

[0045] In one feasible approach, combining Figure 4 and Figure 8As shown, the second sliding structure 5 includes a guide block mounting groove 501 formed on the mounting plane 202, a guide slider 502 fixed in and protruding from the guide block mounting groove 501, a locking assembly connected to the upper end face of the guide slider 502, and a strip groove 503 formed on the bearing oriented block 403. The strip groove 503 is slidably fitted on the guide slider 502, and the locking assembly is used to lock the bearing oriented block 403. Preferably, bearing oriented blocks 403 are provided near both ends on the mounting plane 202, and the two bearing oriented blocks 403 are mirror-symmetrically distributed to facilitate the machining of the mirror-symmetrical fixed driven bearing and fixed driving bearing.

[0046] In detail, the second sliding structure 5 mainly consists of a guide block mounting groove 501, a guide slider 502, a locking assembly, and a strip groove 503. The guide block mounting groove 501 is a recess formed on the mounting plane 202, and its shape and size are designed according to the size and positioning requirements of the guide slider 502. The guide block mounting groove 501 is used to fix the guide slider 502, which is a block-shaped component with a certain strength and rigidity, and its shape and size match the guide block mounting groove 501. The lower end of the guide slider 502 is fixed inside the guide block mounting groove 501 and protrudes from the guide block mounting groove 501 by a certain height to cooperate with the strip groove 503. The upper end face of the guide slider 502 is used to connect the locking assembly to lock the bearing orientation block 403. The locking assembly is a component connected to the upper end face of the guide slider 502, used to lock the bearing orientation block 403 and prevent it from moving during processing. The locking components can take various forms, such as bolts, nuts, and pins, and the specific choice is not limited. The strip groove 503 is a recess formed on the bearing guide block 403, and its shape and size match the guide slider 502. The strip groove 503 is used to cooperate with the guide slider 502 to achieve the horizontal sliding of the bearing guide block 403. The length and width of the strip groove 503 can be designed according to the size and positioning requirements of the bearing a to ensure that the bearing guide block 403 can slide smoothly and press against the side plane c of the bearing a.

[0047] Specifically, after bearing a is oriented and placed on the mounting plane 202, the first step is to align the strip groove 503 of the bearing orienting block 403 with the guide slider 502 and slide it along the guide slider 502. Since the guide slider 502 is fixed within the guide block mounting groove 501, the sliding of the bearing orienting block 403 is guided and restricted by the guide slider 502, ensuring its accurate sliding trajectory in the horizontal direction. After the bearing orienting block 403 slides to contact and tighten with the side plane c of bearing a, it needs to be locked using a locking assembly. In this embodiment, locking can be achieved by tightening a combination of bolts and nuts.

[0048] In this embodiment, by adjusting parameters such as the size and shape of the guide slider 502 and the strip groove 503, adaptability to bearings a of different sizes and shapes can also be achieved.

[0049] Better, such as Figure 4 As shown, the locking assembly includes a screw 504 fixed to the upper end face of the guide slider 502 and a third adjusting nut 505 fitted on the screw 504. The upper end of the screw 504 extends out of the strip groove 503 and fits with the third adjusting nut 505. The third adjusting nut 505 is used to press against the bearing orientation block 403.

[0050] In other words, the locking assembly mainly consists of a screw 504 and a third adjusting nut 505. The screw 504 is a rod-shaped component with external threads. Its lower end is fixed to the upper surface of the guide slider 502, and its upper end extends a certain length from the strip-shaped groove 503 to engage with the third adjusting nut 505. The diameter and length of the screw 504 are designed according to the size and positioning requirements of the bearing guide block 403 to ensure a secure connection between the guide slider 502 and the bearing guide block 403, and to achieve locking of the bearing guide block 403. The third adjusting nut 505 is a nut with internal threads that match the external threads of the screw 504. The third adjusting nut 505 is used to press against the bearing guide block 403, achieving locking of the bearing guide block 403. By turning the third adjusting nut 505, its position on the screw 504 can be adjusted, thereby adjusting the clamping force on the bearing guide block 403.

[0051] Specifically, when the position of the bearing orientation block 403 needs to be adjusted, first, the third adjusting nut 505 is screwed on to move it upward along the screw 504, thereby releasing the pressure on the bearing orientation block 403. At this time, the bearing orientation block 403 can slide freely with the cooperation of the strip groove 503 and the guide slider 502 until it slides to the set position. After the bearing orientation block 403 slides to the set position, it needs to be locked again to ensure the stability of the machining. At this time, the third adjusting nut 505 is screwed on in the opposite direction to move it downward along the screw 504 and press it against the bearing orientation block 403. As the third adjusting nut 505 is tightened, the bearing orientation block 403 will be firmly locked onto the guide slider 502, thereby achieving precise orientation and locking of the bearing a.

[0052] In one implementation, the radial locating post 401 of the bearing has locating steps of different diameters on its cylindrical surface. The diameter of these locating steps is designed according to the inner diameter of the bearing to be located, to ensure that the bearing can be accurately mounted on the locating steps and achieve radial positioning. When radial positioning of bearings with different inner diameters is required, a locating step matching the bearing's inner diameter can be selected. Specifically, the bearing is placed on the locating step, ensuring that the inner diameter of the bearing is tightly fitted with the outer diameter of the locating step.

[0053] This embodiment achieves radial positioning of bearings with different inner diameters by setting positioning steps of different diameters, without replacing the entire positioning column or making complex adjustments. When performing radial positioning of the bearing, simply place the bearing on the corresponding positioning step; no complex operations or adjustments are required.

[0054] In one possible implementation, such as Figure 4 As shown, one end of the semi-cylindrical mounting block 2 is provided with an angle scale line 203, and a pointer 102 is correspondingly provided on the base 1.

[0055] Specifically, the angle scale lines 203 are evenly spaced markings used to indicate different angles of rotation of the semi-cylindrical mounting block 2. It should be understood that these scale lines can be numbers, letters, or other easily identifiable markings. The base 1 is the main part of the clamping fixture, used to support and fix other components. A pointer 102 is provided on the base 1 corresponding to the position of the angle scale lines 203 on the semi-cylindrical mounting block 2. For example, the pointer 102 can be a fixed mark used to point to a specific graduation on the angle scale line 203, thereby determining the rotation angle of the semi-cylindrical mounting block 2.

[0056] When it is necessary to rotate the semi-cylindrical mounting block 2, it can be manually rotated around its axis. During the rotation, the angle scale line 203 will move along with the rotation of the semi-cylindrical mounting block 2. At this time, the specific scale on the angle scale line 203 pointed to by the pointer 102 can be observed to quickly determine the rotation angle of the semi-cylindrical mounting block 2.

[0057] This embodiment provides a simple and effective method for measuring and positioning rotation angles. Due to the design of the angle scale 203 and the pointer 102, accurate measurement and positioning of the rotation angle of the semi-cylindrical mounting block 2 can be achieved. When using the clamping device of this embodiment to measure rotation angles, it is only necessary to observe the scale indicated by the pointer 102.

[0058] In one feasible approach, combining Figure 6 , Figure 7 and Figure 8 As shown, the base 1 is provided with a mounting boss 103 for connecting with the tooling table of the machining center.

[0059] Specifically, the mounting boss 103 is a protruding part on the base 1, and its shape and size are designed to match the machining center fixture table, ensuring that the clamping fixture can be firmly connected to the machining center fixture table, thereby realizing the machining operation. The mating connection between the mounting boss 103 and the machining center fixture table provides stable support for the clamping fixture. Through the mounting boss 103, the clamping fixture can be accurately positioned on the machining center fixture table, which helps to reduce errors in the machining process and improve machining efficiency.

[0060] Combination Figure 11 This invention provides a method for machining a closed oil groove and oblique oil passage hole in a gear pump bearing, as detailed below: Clean the bearing a to be machined, removing surface oil and impurities. Inspect key areas of bearing a, such as the inner hole b and side plane c, to ensure there is no damage or deformation. Start the three-axis machining center and check that all its functions are normal. Select appropriate milling and drilling tools according to the machining requirements.

[0061] The inner hole b of bearing a is mounted on the bearing radial locating post 401 of the clamping fixture. A suitable locating step is selected based on the inner diameter of bearing a to ensure that bearing a is securely positioned on the locating post. Bearing a is rotated so that its side plane c is aligned with the bearing orientation block 403, thus eliminating the orientation of the section angle α. Then, the bearing orientation block 403 is pressed against the side plane c to achieve axial positioning of bearing a. Simultaneously, the bearing axial locating component 402 further positions bearing a axially to ensure that it does not move during machining.

[0062] According to the machining requirements, rotate the semi-cylindrical mounting block 2 to the set angle. The set angle is obtained in advance through testing to ensure that the Z-axis milling tool will not interfere with the upper end of the inner hole b when machining the closed oil groove d. Then, use the locking assembly of the clamping fixture to fix the semi-cylindrical mounting block 2 to ensure that it will not rotate or move during the machining process.

[0063] Start the three-axis machining center and adjust the feed rate and cutting parameters of the Z-axis milling tool. Then, feed downwards using the Z-axis milling tool to mill the side plane c of bearing a, forming a closed oil groove d.

[0064] After the closed oil groove d is machined, the Z-axis drilling tool is replaced. The feed rate and cutting parameters of the drilling tool are adjusted to ensure that they match the position and angle of the closed oil groove d. Then, the bearing a is drilled by feeding downwards through the Z-axis drilling tool to form the inclined oil passage hole e.

[0065] After machining, the workpiece undergoes quality inspection. The dimensions, shape, and position of the closed oil groove d and the inclined oil passage hole e are checked to ensure they meet design requirements. The machined workpiece is then thoroughly cleaned to remove surface cutting fluid and impurities. Finally, rust prevention treatment is applied to ensure the workpiece will not rust or corrode during storage and use.

[0066] It should be noted that a fixture reference hole 104 is provided on the base. When compiling the machining program, the tool path points A and B are calculated through reference conversion and measurement coordinates (e.g., ...). Figure 3 (As shown) The X and Y coordinates of the distance from the fixture reference hole 104 are used to convert the programming reference to the fixture reference hole 104. After the bearing is clamped, it can be machined by linkage of the Z and Y axes of a three-axis machining center. A ball end mill can then be used. Figure 11 The clamping and alignment shown enables the milling of closed oil grooves and the drilling of inclined oil passage holes on a three-axis machining center. In this embodiment, both the ball end mill and the drilling tool are referred to as tool 6.

[0067] This embodiment provides a method for machining the closed oil groove and inclined oil passage hole of a gear pump bearing. The method utilizes a clamping fixture and a three-axis machining center for machining, achieving precise machining and efficient production of the closed oil groove and inclined oil passage hole of the gear pump bearing.

[0068] In the description of this invention, it should be understood that the terms "upper", "lower", "bottom", "inner", "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.

[0069] 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.

[0070] In this invention, unless otherwise explicitly specified and limited, the terms "connected" and "linked" 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.

[0071] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0072] In this invention, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0073] Finally, it should be noted that the above-described embodiments are merely specific implementations of the present invention, used to illustrate the technical solutions of the present invention, and not to limit it. The scope of protection of the present invention is not limited thereto. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that any person skilled in the art can still modify or easily conceive of changes to the technical solutions described in the foregoing embodiments within the technical scope disclosed in the present invention, or make equivalent substitutions for some of the technical features; and these modifications, changes, or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be covered within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A clamping fixture for machining the closed oil groove and inclined oil passage hole of a gear pump bearing, characterized in that, include: The base (1) has a semi-cylindrical concave surface (101) with a horizontal axis. A semi-cylindrical mounting block (2) includes a semi-cylindrical surface (201) and a mounting plane (202). The semi-cylindrical surface (201) and the semi-cylindrical concave surface (101) are slidably connected by a first sliding structure (3). The semi-cylindrical mounting block (2) can reciprocate along the circumference of the semi-cylindrical concave surface (101). The bearing positioning and orientation assembly (4) includes a bearing radial positioning column (401), a bearing axial positioning component (402), and a bearing orientation block (403) disposed on the mounting plane (202). The bearing orientation block (403) is slidably connected to the mounting plane (202) through a second sliding structure (5). The acute angle formed by the sliding direction of the bearing orientation block (403) and the axis of the semi-cylindrical concave surface (101) is complementary to the section angle of the bearing (a). The section angle refers to the angle formed by the first tangent and the second tangent that coincide with the axis of the bearing (a). The first tangent refers to the tangent that divides the side plane (c) of the bearing (a) equally, and the second tangent refers to the tangent that divides the closed oil groove (d) of the bearing (a) equally. The first sliding structure (3) includes a T-shaped groove (301) opened circumferentially on the semi-cylindrical surface (201) near both ends, a first T-shaped guide block (302) fixedly disposed in the semi-cylindrical concave surface (101), a second T-shaped guide block (303) movably disposed in the semi-cylindrical concave surface (101), and a locking module (304) cooperating with the second T-shaped guide block (303). Each T-shaped groove (301) has a first T-shaped guide block (302) and a second T-shaped guide block (303) slidably engaged. The second T-shaped guide block (303) extends out of the side of the base (1) at one end away from the semi-cylindrical concave surface (101), and the extended part is provided with external threads. The locking module (304) is a first adjusting nut, which is connected to the external threads on the second T-shaped guide block (303).

2. The clamping fixture for machining the closed oil groove and inclined oil passage hole of a gear pump bearing according to claim 1, characterized in that, A bearing axial positioning component (402) is provided on each side of the bearing radial positioning column (401). The bearing axial positioning component (402) includes a pressure plate (4020), a support column (4021) and a stud (4022) fixed on the mounting plane (202), and a second adjusting nut (4023) that cooperates with the stud (4022). The stud (4022) is located between the support column (4021) and the bearing radial positioning column (401). The pressure plate (4020) has a through hole. One end of the pressure plate (4020) is placed on the upper end of the support column (4021), and the other end of the pressure plate (4020) is used to press on the upper end of the bearing. The upper end of the stud (4022) passes through the through hole and is connected to the second adjusting nut (4023).

3. The clamping fixture for machining the closed oil groove and inclined oil passage hole of a gear pump bearing according to claim 1, characterized in that, The second sliding structure (5) includes a guide block mounting groove (501) formed on the mounting plane (202), a guide slider (502) fixed in the guide block mounting groove (501) and protruding from the guide block mounting groove (501), a locking assembly connected to the upper end face of the guide slider (502), and a strip groove (503) formed on the bearing orientation block (403). The strip groove (503) is slidably fitted on the guide slider (502), and the locking assembly is used to lock the bearing orientation block (403).

4. The clamping fixture for machining the closed oil groove and inclined oil passage hole of a gear pump bearing according to claim 3, characterized in that, The locking assembly includes a screw (504) fixed to the upper end face of the guide slider (502) and a third adjusting nut (505) fitted on the screw (504). The upper end of the screw (504) extends out of the strip groove (503) and engages with the third adjusting nut (505). The third adjusting nut (505) is used to press against the bearing directional block (403).

5. The clamping fixture for machining the closed oil groove and inclined oil passage hole of a gear pump bearing according to claim 1, characterized in that, The bearing radial positioning column (401) has positioning steps of different diameters on its cylindrical surface.

6. The clamping fixture for machining the closed oil groove and inclined oil passage hole of a gear pump bearing according to claim 1, characterized in that, An angle scale line (203) is provided at one end of the semi-cylindrical mounting block (2), and a pointer (102) is provided on the base (1) accordingly.

7. The clamping fixture for machining the closed oil groove and inclined oil passage hole of a gear pump bearing according to claim 1, characterized in that, The base (1) is provided with a mounting boss (103) for connecting with the tooling table of the machining center.

8. A method for machining a closed oil groove and oblique oil passage hole in a gear pump bearing, characterized in that, After clamping the bearing (a) using the clamping fixture for machining the closed oil groove and inclined oil passage hole of the gear pump bearing according to any one of claims 1 to 7, the bearing is machined on a three-axis machining center. The machining method includes: Install the inner hole (b) of the bearing (a) on the bearing radial positioning post (401), rotate the bearing (a) so that its side plane (c) is aligned with the bearing orientation block (403), then use the bearing orientation block (403) to press against the side plane (c), and then use the bearing axial positioning member (402) to axially position the bearing (a). After rotating the semi-cylindrical mounting block (2) to a set angle, fix the semi-cylindrical mounting block (2) and feed the closed oil groove (d) downward through the Z-axis milling cutter of the three-axis machining center; wherein, the set angle refers to the angle formed between the Z-axis milling cutter and the axis of the bearing (a) when the Z-axis milling cutter head is located at the lower end of the closed oil groove (d) and the Z-axis milling cutter does not interfere with the upper end of the inner hole (b), the set angle is the angle obtained by prior test; After the closed oil groove (d) is machined, the inclined oil passage hole (e) is machined by the Z-axis drilling tool of the three-axis machining center.

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