A machining method and tool for improving matching quality of spherical pairs

Abstract

The application belongs to the technical field of matching machining of spherical pairs, and relates to a machining method and tool for improving matching quality of spherical pairs. The machining method comprises the following steps: assembling 7 / 9 sliding shoe spherical surfaces in a plunger assembly to form a convex spherical surface; manufacturing a concave spherical surface which is the same as the spherical pair of the plunger pump; matching the convex spherical surface and the concave spherical surface according to the working angle of the plunger pump, so that the convex spherical surface and the concave spherical surface are in contact; controlling the convex spherical surface and the concave spherical surface to rotate in opposite directions, and performing spherical pair running-in; and performing coloring inspection on the convex spherical surface and the concave spherical surface, and when the coloring adhesion rate meets the preset requirement, the machining is completed. The convex spherical surface and the concave spherical surface of the sliding shoe of the plunger assembly are processed in groups, the spherical surface size precision and requirements are ensured respectively, and the precise matching requirements of the spherical pair are also ensured. The running-in requirements of the spherical pair in the product are pre-positioned through the group matching machining, the disadvantages of static size matching are avoided, the spherical pair matching requirements facing the use requirements are dynamically realized, and the matching quality is improved.

Description

Technical Field

[0001] This invention belongs to the field of spherical pair mating processing technology, specifically relating to a processing method and tooling for improving the mating quality of spherical pairs. Background Technology

[0002] Spherical pairs are core friction components in precision hydraulic devices such as piston pumps. Their fitting accuracy directly determines the overall performance, efficiency, and service life of the machine, making them a key fundamental technology in high-end equipment manufacturing. Existing spherical pairs, when the convex and concave spherical surfaces are within tolerance limits, often suffer from insufficient actual contact area and stress concentration, leading to accelerated abnormal wear during operation. This makes it difficult to meet the high reliability, long lifespan, and low energy consumption requirements of piston pumps. Currently, the industry's common solution is to process the convex and concave spherical surfaces separately, strictly controlling the dimensional tolerances, spherical errors, and surface roughness of individual parts, and then achieving final fit through post-assembly break-in testing. This technical approach relies on functional break-in after assembly to compensate for machining errors. Its basic logic is to replace initial "fitting" with later "break-in," allowing the friction pair to gradually reach an ideal fit through a certain period of actual operation.

[0003] Existing methods for separate machining followed by break-in have several inherent drawbacks: First, the break-in period is long and the operating conditions are demanding, significantly increasing production cycles and debugging costs. Second, excessive wear is prone to occur under extreme tolerance combinations, which not only reduces component lifespan but may also cause system performance degradation or failure. Third, simply improving component machining accuracy has approached the limits of current manufacturing processes, resulting in soaring costs with limited returns, and the marginal effect of technological advancement is obvious. Therefore, the industry urgently needs to develop a new manufacturing process that is oriented towards actual operating conditions and can achieve efficient and precise mating of ball joints. Summary of the Invention

[0004] The purpose of this invention is to provide a processing method and tooling for improving the matching quality of spherical pairs, so as to solve the technical problems of separate processing and re-running in the prior art, such as long running-in cycle, harsh working conditions, long production cycle and high debugging cost.

[0005] To achieve the above objectives, the present invention employs the following technical solution:

[0006] This application discloses a processing method for improving the matching quality of spherical pairs, including:

[0007] Assemble the spherical slipper surfaces in the plunger assembly to form a convex spherical surface; fabricate a concave spherical surface identical to the spherical pair of the plunger pump.

[0008] The convex and concave spherical surfaces are matched according to the operating angle of the plunger pump so that the convex and concave spherical surfaces come into contact.

[0009] Control the convex and concave spherical surfaces to rotate in opposite directions to perform spherical pair running-in;

[0010] The convex and concave spherical surfaces are inspected for coloring. When the coloring adhesion rate meets the preset requirements, the processing is completed.

[0011] Preferably, during the break-in of the spherical pair, the convex spherical surface is immersed in the working medium, aviation kerosene.

[0012] Preferably, a first tooling assembly is used to assemble a group of 7 / 9 slipper spherical surfaces in the plunger assembly to form a convex spherical surface. The first tooling assembly is used to assemble the convex spherical surface and the concave spherical surface, and the convex spherical surface and the concave spherical surface are controlled to rotate in opposite directions to carry out the spherical pair running-in.

[0013] Preferably, the first tooling assembly includes a rotor, with a spherical slipper assembled on the rotor to form a convex spherical surface, and a swashplate made to be the same as the spherical pair of the plunger pump being a concave spherical surface; a first shaft connector is provided below the rotor, and a first motor is connected to the first shaft connector; the convex spherical surface contacts the concave spherical surface; a second shaft connector is provided above the concave spherical surface, and a second motor is connected to the second shaft connector.

[0014] Preferably, the rotor is mounted on the rotating shaft of the first motor via a first shaft connector, and the rotational speed is 15 to 30 revolutions per minute.

[0015] Preferably, the swashplate is mounted on the rotating shaft of the second motor via a second shaft connector, with a rotational speed of 60-120 rpm. The rotor and the swashplate rotate in opposite directions relative to each other under the action of the first motor and the second motor, and the swashplate deflects at an angle of 5° relative to the main shaft.

[0016] Preferably, the rotor has a mounting hole, a spring assembly is installed in the mounting hole, and the spherical surface of the slipper is arranged on the spring assembly to form a convex spherical surface.

[0017] Preferably, a second tooling assembly is used to assemble a group of 7 / 9 slipper spherical surfaces in the plunger assembly to form a convex spherical surface. The second tooling assembly is used to assemble the convex spherical surface and the concave spherical surface, and the convex spherical surface and the concave spherical surface are controlled to rotate in opposite directions to carry out the spherical pair running-in.

[0018] Preferably, the second tooling assembly includes a partition plate, a base, and a fixing device. The partition plate and the base are concave spherical surfaces with the same dimensional accuracy as the plunger pump spherical surfaces and are connected to a motor. The partition plate is placed on the base, and the plunger assembly passes through the partition plate so that the spherical surface of the slipper contacts the concave spherical surface of the base. The fixing device is set above the partition plate and the base to fix the plunger assembly.

[0019] Preferably, when the base rotates under the action of the motor, the separator revolves in the ball socket of the base.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] This invention utilizes the group processing of the convex and concave spherical surfaces of the slipper of a plunger assembly. While ensuring the dimensional accuracy and requirements of each spherical surface, it also guarantees the precision fit of the spherical pair. By processing the spherical pairs in a group before their break-in period in the product, the drawbacks of static dimensional fit are precisely avoided. The dynamic realization of the spherical pair fit requirements oriented towards usage needs is achieved, improving the fit quality of the spherical pairs and extending the lifespan of the plunger pump. Furthermore, this application falls within the category of general process technology, widely used in military product manufacturing. It solves the problem of abnormal working surface marks or contamination of the swashplate and slipper working surfaces after the product's break-in period, even when all dimensions of the plunger pump's spherical pairs are qualified. By processing the spherical pairs in a group before break-in, the first-time pass rate of the product is improved, and the product's service life is extended. It also provides a methodology and factual basis for the processing of parts with the same structure, which is of great significance for improving technical capabilities and mass production. Attached Figure Description

[0022] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the spherical mating pair according to an embodiment of the present invention;

[0024] Figure 2 This is a partial cross-sectional view of a spherical mating pair according to an embodiment of the present invention;

[0025] Figure 3 This is a schematic diagram of the first tooling assembly according to an embodiment of the present invention;

[0026] Figure 4 This is a schematic diagram of the second tooling assembly according to an embodiment of the present invention, wherein (a) is a partial sectional view and (b) is a partial top view.

[0027] Wherein: 1-plunger assembly; 2-concave spherical surface; 3-convex spherical surface; 4-second motor; 5-second shaft connector; 6-swashplate; 7-first shaft connector; 8-first motor; 9-rotor; 901-spring assembly; 10-separator plate; 11-base; 12-fixing device. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments 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, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0029] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0030] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0031] In the description of the embodiments of the present invention, it should be noted that if terms such as "upper," "lower," "horizontal," or "inner" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of the invention is in use, they are only for the convenience of describing the present 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, and therefore should not be construed as a limitation of the present invention. Furthermore, terms such as "first" and "second" are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0032] Furthermore, the use of the term "horizontal" does not imply that the component must be absolutely horizontal, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0033] In the description of the embodiments of the present invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in the present invention according to the specific circumstances.

[0034] The present invention will now be described in further detail with reference to the accompanying drawings:

[0035] This invention aims to improve the fitting accuracy of key spherical pairs in plunger pumps, reduce the running-in stress of these pairs during product break-in, and enhance product quality stability. It attempts to utilize a fitting and machining method tailored to the operating conditions of the spherical pairs, breaking through the current manufacturing limits of spherical pair precision and further improving the matching degree of the spherical pairs. To improve the service life and performance reliability of plunger pumps, and considering the influence of various uncertain factors, it is necessary to further improve the fitting accuracy of the spherical pairs. This invention attempts to utilize a spherical pair fitting and machining method to realize the requirements and results of the spherical pairs after break-in during the product's manufacturing process. This not only improves the fitting quality of the spherical pairs but also reduces the risk of cleanliness contamination caused by foreign matter generated during excessive break-in.

[0036] See Figure 1 , Figure 2 In a plunger pump, the key spherical pair, the swashplate, rotates and revolves with the 7 / 9 plunger assemblies. The convex spherical surface is a common spherical surface formed by the spherical surfaces of the slippers in the 7 / 9 plunger assemblies, while the concave spherical surface is the swashplate surface with a large diameter and a small crown shape. To improve the fitting accuracy of the spherical pair, the common spherical surface of the swashplate and the slippers in the 7 / 9 plunger assemblies undergoes matching machining. The aim is to achieve the desired effect after the spherical pair has been run-in in the product.

[0037] This application discloses a processing method for improving the matching quality of spherical pairs, including:

[0038] Assemble the spherical surface of the slipper in plunger assembly 1 to form a convex spherical surface 3; and fabricate a concave spherical surface 2 identical to the spherical surface pair of the plunger pump.

[0039] The convex spherical surface 3 and the concave spherical surface 2 are matched according to the working angle of the plunger pump so that the convex spherical surface 3 and the concave spherical surface 2 come into contact.

[0040] Control the convex spherical surface 3 and the concave spherical surface 2 to rotate in opposite directions to perform spherical pair running-in;

[0041] The convex spherical surface 3 and the concave spherical surface 2 are colored for inspection. When the coloring adhesion rate meets the preset requirements, the processing is completed.

[0042] While ensuring the various elements of the spherical pair of the plunger pump are individually guaranteed, the concave spherical surface of the swashplate and the convex spherical surfaces of the slippers of the 7 / 9 plunger assemblies are machined as a set according to the working mode of the spherical pair in the product. This reduces the cumulative fit error calculated by measuring the values ​​of the 7 / 9 individual mating surfaces in the spherical pair using measuring tools. The concave spherical surface and the 7 / 9 grouped convex mating surfaces in the spherical pair act as cutting tools and measuring tools for each other. This eliminates the anisotropy of the slipper convex spherical surface of a single plunger assembly within the tolerance range. While improving the fit accuracy during mutual running-in, it also moves the quality risk of the spherical pair forward, reduces the running-in force of this pair of spherical pairs in the product, improves the first-time pass rate of the product, and also reduces the risk of cleanliness contamination after running-in.

[0043] Using a plunger pump spherical pair assembly break-in tool, the convex spherical surfaces of the slippers of 7 / 9 plunger assemblies are grouped together with the concave spherical surfaces of the swashplate for break-in. This advances the break-in of the plunger assemblies and swashplates from the assembly product to the smaller assemblies, shifting the risk of mismatch between the plunger assemblies and swashplates forward and improving the cleanliness accuracy level of the product.

[0044] In some embodiments, a first tooling assembly is used to assemble the spherical surfaces of 7 / 9 plunger assemblies 1 to form a convex spherical surface 3. The first tooling assembly is used to assemble the convex spherical surface 3 and the concave spherical surface 2, and the convex spherical surface 3 and the concave spherical surface 2 are controlled to rotate in opposite directions to perform spherical pair running-in.

[0045] In some embodiments, see Figure 3 The first tooling assembly includes a rotor 9, a convex spherical surface 3 is assembled on the rotor 9, and a swashplate 6, which is made to be the same as the spherical surface pair of the plunger pump, is a concave spherical surface 2; a first shaft connector 7 is provided below the rotor 9, and a first motor 8 is connected to the first shaft connector 7; the convex spherical surface 3 contacts the concave spherical surface 2; a second shaft connector 5 is provided above the concave spherical surface 2, and a second motor 4 is connected to the second shaft connector 5.

[0046] In some embodiments, the rotor 9 is mounted on the rotating shaft of the first motor 8 via the first shaft connector 7, and rotates at a speed of 15 to 30 rpm. The swashplate 6 is mounted on the rotating shaft of the second motor 4 via the second shaft connector 5, and rotates at a speed of 60 to 120 rpm. The rotor 9 and the swashplate 6 rotate in opposite directions relative to each other under the action of the first motor 8 and the second motor 4, and the swashplate 6 is deflected from the main shaft at an angle of 5°.

[0047] In some embodiments, the rotor 9 has a mounting hole, a spring assembly 901 is disposed in the mounting hole, and a spherical surface of the slipper is disposed on the spring assembly 901 to form a convex spherical surface 3.

[0048] In some embodiments, see Figure 3 Using a plunger pump spherical assembly break-in tool, the convex spherical surfaces of the slipper shoes of 7 / 9 plunger assemblies are broken in with the concave spherical surfaces of the swashplate (see...). Figure 3 The spherical surface of the slipper is assembled on the rotor 9 to form a convex spherical surface 3, and the swashplate 6, which is the same as the spherical pair of the plunger pump, is a concave spherical surface 2.

[0049] a. Seven or nine plunger assemblies are installed in rotor 9, with the convex spherical surface 3 contacting the concave spherical surface 2 formed by the swashplate 6, participating in the break-in process. The rotor serves as the tooling base for the spherical pair break-in. This break-in structure is the same as the assembly mode of the plunger assemblies in the product, and is closer to the working state.

[0050] b. Connect the swash plate and rotor to the first motor and the second motor respectively using shaft connector 1 and shaft connector 2, so that the swash plate rotates in the opposite direction to the rotor within a 5° deflection angle range, thereby achieving the effect of spherical pair running-in.

[0051] c. The convex spherical surface of the slipper of the 7 / 9 plunger assembly and the concave spherical surface of the swashplate 6 are run-in in an oil medium. While ensuring dimensional accuracy, the 7 / 9 plunger assemblies are grouped together and the concave spherical surface of the swashplate 6 are colored for inspection. The matching accuracy of the 7 / 9 grouped plunger assemblies and the swashplate spherical surface pair is determined based on the adhesion rate of the colored material.

[0052] Seven or nine plungers and slipper assemblies are installed in seven or nine mounting holes of rotor 9. Spring assemblies are installed in these holes to push the slippers against the spherical surface of swashplate 6. The portion of the slipper extending out of the rotor is engaged in seven or nine through holes of the cage, consistent with its working condition in the product, to prevent excessive deflection. Rotor 9 is mounted on the rotating shaft of first motor 8 via first shaft connector 7, with a speed of 15-30 rpm. Swashplate 6 is mounted on the rotating shaft of second motor 4 via second shaft connector 5, with a speed of 60-120 rpm. Rotor 9 and swashplate 6 rotate in opposite directions relative to each other under the action of the motors, and the deflection angle between swashplate 6 and the main shaft is 5°. The sliding shoe convex spherical surface rotates relative to the center of the swashplate 6 to form a revolution. At the same time, due to the difference in linear velocity, the maximum outer circle of the sliding shoe convex spherical surface also causes the sliding shoe convex spherical surface to rotate around the center of the plunger assembly. In the relative motion of rotation and revolution, the sliding shoe convex spherical surface is fully rubbed against the swashplate 6 to achieve the same working condition for the 7 / 9 spherical surfaces of the sliding shoe. Throughout the process, the sliding shoe convex spherical surface is immersed in the working medium aviation kerosene.

[0053] In some embodiments, a second tooling assembly is used to assemble the spherical surfaces of the 7 / 9 plunger assemblies 1 to form a convex spherical surface 3. The second tooling assembly is used to assemble the convex spherical surface 3 and the concave spherical surface 2, and the convex spherical surface 3 and the concave spherical surface 2 are controlled to rotate in opposite directions to perform spherical pair running-in.

[0054] In some embodiments, see Figure 4 The second tooling assembly includes a partition plate 10, a base 11, and a fixing device 12. The partition plate 10 and the base 11 are concave spherical surfaces with the same dimensional accuracy as the spherical surfaces of the plunger pump and are connected to a motor. The partition plate 10 is placed on the base 11, and the plunger assembly 1 passes through the partition plate 10 so that the spherical surface of the slipper contacts the concave spherical surface of the base 11. The fixing device 12 is set above the partition plate 10 and the base 11 to fix the plunger assembly 1.

[0055] In some embodiments, the use of a second tooling assembly for spherical pair running-in includes:

[0056] a. First, place the separator 10 (1 to 3) on the mating concave spherical base 11. The concave spherical dimensions and accuracy are exactly the same as those of the concave spherical part of the plunger pump.

[0057] b. Place the plunger assemblies in groups of 3 or 7 / 9, pass them through the separators 10 (1 to 3), and make contact between the spherical surface of the slipper and the concave spherical surface of the base 11, and fix the plunger assemblies with a fixing device.

[0058] c. The slippers of the 7 / 9 plunger assemblies and the concave spherical surface of the base 11 are run-in in an oil medium. While ensuring dimensional accuracy, the 7 / 9 plunger assemblies are grouped together and the concave spherical surface of the swashplate is colored for inspection. The matching accuracy of the 7 / 9 grouped plunger assemblies and the swashplate spherical pair is determined based on the color adhesion rate.

[0059] The base 11 rotates under the action of the motor. 7 / 9 of the convex spherical surfaces of the slipper are distributed in 7 / 9 of the mounting holes of the three partition plates 10. The convex spherical surfaces of the slipper are in contact with the concave spherical surfaces of the base 11. The slipper is kept in its original position under the action of the counterweight. The convex spherical surfaces of the slipper rotate relative to the concave spherical surfaces of the base 11. The three partition plates revolve in the spherical sockets of the base. The distance between the outermost and innermost rings of the slipper convex spherical surfaces and the center of the base 11 will generate a linear velocity difference. Under the action of the linear velocity difference, the slipper convex spherical surfaces will rotate around the center of the slipper in the mounting holes of the partition plates. In the relative motion of rotation and revolution, the slipper convex spherical surfaces are fully rubbed against the spherical surfaces of the base to achieve the same working condition for 7 / 9 of the spherical surfaces of the slipper. Throughout the process, the slipper convex spherical surfaces are immersed in the working medium aviation kerosene.

[0060] By machining the convex spherical surface of the slipper and the concave swashplate of the 7 / 9 plunger assembly in groups, the dimensional accuracy and requirements of the spherical surfaces are ensured, while also guaranteeing the precision fit of the spherical pair. This group-based machining pre-processes the spherical pair during product break-in, precisely avoiding the drawbacks of static dimensional fits and dynamically achieving the spherical pair fit requirements oriented towards usage needs. This improves the fit quality of the spherical pair and contributes to extending the lifespan of the plunger pump. This invention falls under the category of general process technology and is widely used in military product manufacturing. It solves the problem of abnormal working surface marks or cleanliness contamination caused by break-in after the spherical pair of the plunger pump has met dimensional requirements, leading to various abnormal appearances on the working surfaces of the swashplate and slipper. By pre-processing the complete spherical pair for break-in, the first-time pass rate of the product is improved, and the product's service life is extended. It also provides a methodology and factual basis for the machining of parts with the same structure, which is of great significance for improving technical capabilities and mass production.

[0061] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A processing method for improving the matching quality of spherical pairs, characterized in that, include: Assemble the spherical slipper in the plunger assembly (1) to form a convex spherical surface (3); and make a concave spherical surface (2) that is the same as the spherical surface pair of the plunger pump. The convex spherical surface (3) and the concave spherical surface (2) are matched according to the working angle of the plunger pump so that the convex spherical surface (3) and the concave spherical surface (2) come into contact; Control the convex spherical surface (3) and the concave spherical surface (2) to rotate in opposite directions to perform spherical pair running-in; The convex spherical surface (3) and the concave spherical surface (2) are colored for inspection. When the coloring adhesion rate meets the preset requirements, the processing is completed. In this process, a first tooling assembly is used to assemble a group of 7 or 9 slipper spherical surfaces of the plunger assembly (1) to form a convex spherical surface (3). The first tooling assembly is used to assemble the convex spherical surface (3) and the concave spherical surface (2), and the convex spherical surface (3) and the concave spherical surface (2) are controlled to rotate in opposite directions to perform spherical surface pair running-in. The first tooling assembly includes a rotor (9), and the slipper spherical surfaces are arranged on the rotor (9) to form a convex spherical surface (3). A swashplate (6) with the same spherical surface pair as the plunger pump is made as a concave spherical surface (2). A first shaft connector (7) is provided below the rotor (9), and a first motor (8) is connected to the first shaft connector (7). The convex spherical surface (3) The rotor (9) contacts the concave spherical surface (2), and a second shaft connector (5) is provided above the concave spherical surface (2). The second shaft connector (5) is connected to the second motor (4). The swashplate (6) is mounted on the rotating shaft of the second motor (4) through the second shaft connector (5). The rotation speed is 60 to 120 revolutions per minute. The rotor (9) and the swashplate (6) rotate in opposite directions under the action of the first motor (8) and the second motor (4). The swashplate (6) deflects the main shaft at an angle of 5°. The rotor (9) has a mounting hole, and a spring assembly (901) is provided in the mounting hole. The spherical surface of the slipper is set on the spring assembly (901) to form a convex spherical surface (3).

2. The processing method for improving the matching quality of spherical pairs according to claim 1, characterized in that, During the break-in of the spherical pair, the convex spherical surface (3) is immersed in the working medium aviation kerosene.

3. The processing method for improving the matching quality of spherical pairs according to claim 1, characterized in that, The rotor (9) is mounted on the rotating shaft of the first motor (8) via the first shaft connector (7) and rotates at a speed of 15 to 30 revolutions per minute.

4. The processing method for improving the matching quality of spherical pairs according to claim 1, characterized in that, The spherical surfaces of the 7 or 9 plunger assemblies (1) are assembled into a convex spherical surface (3) using the second tooling assembly. The convex spherical surface (3) and the concave spherical surface (2) are assembled using the second tooling assembly, and the convex spherical surface (3) and the concave spherical surface (2) are controlled to rotate in opposite directions to carry out the spherical pair running-in.

5. The processing method for improving the matching quality of spherical pairs according to claim 4, characterized in that, The second tooling assembly includes a partition plate (10), a base (11), and a fixing device (12). The partition plate (10) and the base (11) are concave spherical surfaces with the same dimensional accuracy as the spherical surfaces of the plunger pump. A motor is connected to the base (11). The partition plate (10) is placed on the base (11). The plunger assembly (1) passes through the partition plate (10) so that the spherical surface of the slipper contacts the concave spherical surface of the base (11). The fixing device (12) is set above the partition plate (10) and the base (11) to fix the plunger assembly (1).

6. The processing method for improving the matching quality of spherical pairs according to claim 5, characterized in that, When the base (11) rotates under the action of the motor, the separator (10) revolves in the ball socket of the base (11).

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