An inner tooth sleeve ring abrasive grain polishing clamp

Abstract

The present application relates to precision machining and surface engineering technical field, disclose a kind of inner tooth sleeve circle abrasive grain polishing fixture.The fixture includes chassis, core and end cap, three cooperation inner tooth sleeve circle to be polished form closed polishing space.Core is installed in inner tooth sleeve circle inside, its outer wall is provided with profiled tooth along circumference and inner tooth sleeve circle tooth shape is matched, and processing gap is formed between two;Core wall surface is alternatively provided with feed groove and discharge groove, and two are separated in circumferential direction by profiled tooth.Processing, abrasive flows into by feed groove, is forced to flow through processing gap along tooth profile tangential transversely, and is discharged into discharge groove.This application is designed by tangential flow channel, makes processing texture and gear meshing sliding direction consistent, significantly improves the lubrication performance of part;With the staggered indexing structure of fixture, multi-station superposition processing is carried out, effectively eliminates fluid inlet and outlet effect, greatly improves the tooth surface precision and surface quality consistency of inner tooth sleeve circle.

Description

Technical Field

[0001] This invention relates to the fields of precision machining and surface engineering technology, specifically to an internal gear ring abrasive polishing fixture. Background Technology

[0002] Internal gear rings (such as planetary gear reducer gear rings, internal splines, etc.) are core components of high-end mechanical transmission systems. These parts often operate under heavy loads and high speeds, and the profile accuracy, surface roughness, and surface texture direction of their tooth surfaces directly determine the accuracy, efficiency, and fatigue life of the transmission system.

[0003] Abrasive flow machining utilizes a viscoelastic, semi-solid abrasive medium that flows over the workpiece surface under pressure, generating micro-cutting and sliding friction. It is an effective method for finishing complex internal cavity surfaces. However, existing abrasive flow machining methods for internal gear rings have significant drawbacks: 1. Poor flow field uniformity: The cross-sectional changes of the flow channel formed by traditional fixtures are large, resulting in uneven distribution of abrasive velocity and pressure at the tooth tip and root, which can easily cause damage to tooth profile accuracy (such as over-polishing of tooth tip, under-polishing of tooth root, and changes in tooth profile).

[0004] 2. Mismatched texture direction: Traditional methods guide the abrasive to flow along a single axis (Z-axis), resulting in surface textures perpendicular to the sliding direction during gear meshing. Axial textures are perpendicular to the lubricating oil film formation direction (which is detrimental to oil film retention) and easily lead to micropitting under high contact stress, reducing the wear resistance and lifespan of parts. Summary of the Invention

[0005] The purpose of this invention is to overcome the defects of poor polishing uniformity and axial texture direction in the prior art, and to provide an abrasive flow directional polishing fixture for internal gear rings. This method constructs a contoured flow channel and controls the flow of the abrasive medium, forcing the abrasive to flow tangentially along the tooth profile, thereby obtaining a high-quality texture that is basically consistent with the meshing direction and significantly improving the processing uniformity.

[0006] The technical means employed in this invention are as follows: An abrasive polishing fixture for an internal gear ring includes a base, a core, and an end cap, which work together with the internal gear ring to be polished to form a closed abrasive flow channel system.

[0007] The chassis has a feed hole at its center, which serves as the inlet for the abrasive medium.

[0008] The chassis has a positioning stepped surface and a first positioning pin hole. These features are used to achieve coaxial positioning and circumferential position constraint between the internal gear ring and the core. The first positioning pin hole comprises multiple pin holes at different angles. By switching these pin holes, the relative phase between the internal gear ring and the core can be changed, creating multiple machining stations. The outer side of the core wall is provided with contour teeth, which are evenly distributed along the circumference. The contour teeth match the tooth shape of the inner tooth ring, and the two fit together to form a uniform gap. The gap width is designed to be [missing information]. arrive .

[0009] The core wall is alternately provided with feed grooves and discharge grooves. The feed grooves are approximately evenly distributed along the circumference according to the number of teeth. The width of the feed groove is greater than or equal to twice the machining gap width and less than or equal to two tooth widths. The discharge groove is located in the middle of two adjacent feed grooves. The width of the discharge groove is the same as the width of the feed groove. The depth of the discharge groove is greater than 1.2 times the tooth height to ensure smooth abrasive flow and accommodate turbulent flow areas.

[0010] The core has second positioning pin holes on its upper and lower end faces. The second positioning pin holes include multiple pin holes at different angles, which are used to constrain the position of the component.

[0011] The end cap has a positioning stepped surface and a third positioning pin hole, which are used to mate with the core and the internal gear ring.

[0012] The end cap is provided with a discharge hole, the position of which corresponds precisely to the position of the discharge groove to ensure the abrasive is discharged.

[0013] A polishing method for an internal gear ring abrasive polishing fixture includes the following steps: Step 1: Assemble the internal gear ring abrasive polishing fixture. The abrasive enters through the feed groove and flows laterally across the machining gap to polish the tooth surface. Step 2: After completing one machining operation, the relative angle between the core and the inner gear ring is changed by adjusting the first and second locating pin holes, and the inner gear ring is flipped up and down. Step 3: Repeated abrasive flow processing to eliminate fluid inlet and outlet effects through multi-station superposition.

[0014] This method involves the abrasive entering through the chassis and filling the feed groove of the core. Due to the flow channel constraint, the abrasive cannot pass directly axially; instead, it is diverted laterally from the feed groove and enters the uniform gap formed by the core's contour teeth and the inner tooth ring. It then flows tangentially along the tooth profile to the adjacent discharge groove and is finally discharged through the end cover. This process achieves precision polishing of the entire tooth profile.

[0015] Compared with the prior art, the present invention has the following advantages: 1. The contouring clearance strictly constrains the velocity and pressure fields of the abrasive, avoiding the "dead zone" or "overflow zone" in traditional large-gap machining.

[0016] 2. The abrasive is forced to flow along the tooth profile, and the resulting machining texture is basically consistent with the meshing and sliding direction of the gear during operation, which significantly improves lubrication performance and reduces vibration and noise.

[0017] 3. By adjusting the relative position of the positioning pin holes and combining this with workpiece flipping, local differences caused by the inlet and outlet effects can be eliminated, achieving ultra-high precision surface processing.

[0018] Based on the above reasons, this invention can be widely applied in the field of abrasive flow precision machining. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art 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 based on these drawings without creative effort.

[0020] Figure 1 This is an exploded assembly diagram of the various parts of an internal gear ring abrasive polishing fixture according to Embodiment 1 of the present invention; Figure 2 This is a half-sectional view of an internal gear ring abrasive polishing fixture according to Embodiment 1 of the present invention; Figure 3 This is a schematic diagram of the positioning hole distribution in the chassis of an internal gear ring abrasive polishing fixture according to Embodiment 1 of the present invention; Figure 4 This is a cross-sectional view of the core in an internal gear ring abrasive polishing fixture according to Embodiment 1 of the present invention; Figure 5 This is a schematic diagram of the abrasive flow path in an internal gear ring abrasive polishing fixture according to Embodiment 1 of the present invention.

[0021] In the diagram: 10, chassis; 11, first locating pin hole; 20, internal gear ring; 30, core; 31, feed groove; 32, profile tooth; 33, discharge groove; 34, second locating pin hole; 40, end cap; 41, discharge hole; 42, third locating pin hole. Detailed Implementation

[0022] To more clearly illustrate the technical solution of the present invention, further explanation is provided below in conjunction with embodiments.

[0023] Example 1: This invention discloses an abrasive polishing fixture for internal gear rings, comprising: The chassis 10 is provided with multiple first locating pin holes 11, and the included angle of the two first locating pin holes 11 on the inner ring is 2 teeth (the angle of a single tooth is 360° / 79°); the core 30 is provided with two second locating pin holes 34, and the included angle is 4 teeth; the outer contour of the core 30 has contour teeth 32 that match the inner toothed ring 20, and the machining clearance is controlled to be 1.5. The core 30 is approximately evenly divided into 10 flow channel groups along its circumference. In this embodiment, since 79 teeth are a prime number, the flow channels are distributed approximately evenly along the circumference. In practical applications, the number of feed channels and discharge channels can be adjusted according to the number of teeth on the workpiece. The number of flow channel groups and the number of teeth on the workpiece are preferably coprime (or non-integer multiples) to facilitate covering all tooth surfaces by rotating the index. Each group includes a feed channel 31 and a discharge channel 33. The feed channel 31 guides the abrasive into the gap, and the discharge channel 33 guides the abrasive out. The end cap 40 is provided with a third positioning pin hole 42, the position of which corresponds to the discharge channel 33 of the core 30.

[0024] In practice, the specific working process is as follows: The internal gear ring 20 is fitted over the core 30, installed on the base 10, and positioned using pin holes; the end cap 40 is then placed on top and fixed; during machining, the abrasive medium enters the feed groove 31 and is forced laterally through the tooth surface gap into the discharge groove 33. During this process, the turbulent flow zone at the outlet of the flow channel is designed within the discharge groove of the core, rather than on the workpiece surface, thus protecting the workpiece surface; after completing one round of machining, the relative angle between the internal gear ring and the core is changed using the positioning pin holes (rotating 0 teeth, ...). (2 teeth or 4 teeth), and the inner toothed ring can be flipped up and down to form 4*2=8 processing stations. By superimposing processing at 8 different stations, the local unevenness caused by the fluid inlet and outlet effect can be improved, and a highly consistent surface quality can be obtained.

[0025] Example 2: An abrasive polishing fixture for internal gear rings includes a base 10, a core 30, and an end cap 40, which, together with the internal gear ring 20 to be polished, form a closed polishing space. The base 10 has a feed hole at its center. The core 30 is mounted above the base 10 and located inside the internal gear ring 20. The end cap 40 is mounted above the core 30 and the internal gear ring 20. The outer wall surface of the core 30 has contoured teeth 32 along its circumference. The shape of the contoured teeth 32 matches the tooth shape of the internal gear ring 20, forming a machining gap between them. The core 30 is also provided with an alternate feed groove 31 and a discharge groove 33 on its wall surface. The feed groove 31 and the discharge groove 33 are separated by the contour teeth 32 in the circumferential direction. The feed groove 31 is connected to the feed hole of the chassis 10. The end cover 40 is provided with a discharge hole 41, which is connected to the discharge groove 33 of the core 30. The feed groove 31, the processing gap and the discharge groove 33 are configured to form a tangential flow channel, so that after the abrasive flow enters through the feed groove 31, it can flow tangentially through the processing gap and flow into the discharge groove 33 for discharge.

[0026] The contour teeth 32 of the core 30 and the tooth surfaces of the inner toothed ring 20 are equidistantly distributed to form a machining gap of equal width.

[0027] The processing gap width is 1mm to 3mm.

[0028] The width of the feed groove 31 is greater than or equal to twice the processing gap width and less than or equal to twice the tooth width.

[0029] The discharge trough 33 is located at the center of two adjacent feed troughs 31, and its width is the same as that of the feed trough 31; the depth of the discharge trough 33 is greater than 1.2 times the height of the 20 teeth of the inner toothed ring.

[0030] An internal gear ring abrasive polishing fixture is also equipped with a staggered indexing structure, that is, the base 10 is provided with a plurality of first positioning pin holes 11 along the circumference, and the core 30 is provided with a second positioning pin hole 34 that mates with it; the angular distribution of the first positioning pin hole 11 and the second positioning pin hole 34 satisfies that when the pin is inserted into different hole positions, the core 30 is offset relative to the internal gear ring 20 by a predetermined circumferential angle.

[0031] The end cap 40 has a positioning step surface and a third positioning pin hole 42, which are used to position the relative position with the internal gear ring 20.

[0032] Example 3: A polishing method for an internal gear ring abrasive polishing fixture includes the following steps: Step 1: Assemble the internal gear ring abrasive polishing fixture. The abrasive enters through the feed groove 31 and flows laterally through the machining gap to polish the tooth surface. Step 2: After completing one machining operation, the relative angle between the core 30 and the inner gear ring 20 is changed by adjusting the first positioning pin hole 11 and the second positioning pin hole 34, and the inner gear ring 20 is flipped up and down. Step 3: Repeated abrasive flow processing to eliminate fluid inlet and outlet effects through multi-station superposition.

[0033] The above description is merely a specific embodiment of the present invention and is a basic description of the preferred mode of the invention. It is not intended to limit the invention, but the scope of protection of the present invention is not limited thereto. Any modifications and improvements made by those skilled in the art to the technical solutions of the present invention within the scope of the technology disclosed in the present invention, without departing from the spirit of the invention, should fall within the scope of protection defined in the patent claims of the present invention. The scope of protection of the present invention is determined by the scope of the claims.

[0034] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. An abrasive polishing fixture for an internal gear ring, comprising a base (10), a core (30), and an end cap (40), which together with the internal gear ring (20) to be polished form a closed polishing space; the base (10) has a feed hole at its center, the core (30) is mounted above the base (10) and located inside the internal gear ring (20), and the end cap (40) is mounted above the core (30) and the internal gear ring (20); characterized in that: The outer wall of the core (30) is provided with contour teeth (32) along the circumferential direction. The shape of the contour teeth (32) matches the tooth shape of the inner toothed ring (20), and a processing gap is formed between them. The wall of the core (30) is also alternately provided with a feed groove (31) and a discharge groove (33). The feed groove (31) is a radial groove that penetrates the core wall and connects the inner cavity of the core with the outer circumferential wall. The discharge groove (33) is an axial groove that extends axially on the outer circumferential wall of the core (30). The feed groove (31) and the discharge groove (33) are separated by the contour teeth (32) in the circumferential direction. The feed groove (31) is connected to the feed hole of the chassis (10). The end cap (40) is provided with a discharge hole (41). The discharge hole (41) is connected to the core (30) and the inner toothed ring (20). The discharge trough (33) of 0) is connected; the feed trough (31), the processing gap and the discharge trough (33) are configured to form a tangential flow channel, so that after the abrasive flow enters through the feed trough (31), it can flow tangentially through the processing gap and flow into the discharge trough (33) for discharge; it is also configured with a staggered indexing structure, that is, the chassis (10) is provided with a plurality of first positioning pin holes (11) along the circumference, and the core (30) is provided with a second positioning pin hole (34) that cooperates with it; the angle distribution of the first positioning pin hole (11) and the second positioning pin hole (34) satisfies that: when the pin is inserted into different holes, the core (30) produces a predetermined circumferential angle offset relative to the inner gear ring (20) to flip the inner gear ring (20) up and down, and eliminate the fluid inlet and outlet effect by multi-station superposition.

2. The internal gear ring abrasive polishing fixture according to claim 1, characterized in that, The contour teeth (32) of the core (30) and the tooth surfaces of the inner toothed ring (20) are equidistantly distributed to form a machining gap of equal width.

3. The internal gear ring abrasive polishing fixture according to claim 2, characterized in that, The processing gap width is 1mm to 3mm.

4. The internal gear ring abrasive polishing fixture according to claim 1, characterized in that, The width of the feed groove (31) is greater than or equal to twice the processing gap width and less than or equal to twice the tooth width.

5. The internal gear ring abrasive polishing fixture according to claim 1, characterized in that, The discharge trough (33) is located at the center of two adjacent feed troughs (31), and its width is the same as that of the feed trough (31); the depth of the discharge trough (33) is greater than 1.2 times the tooth height of the inner toothed ring (20).

6. The internal gear ring abrasive polishing fixture according to claim 1, characterized in that, The end cap (40) has a positioning step surface and a third positioning pin hole (42) for positioning relative to the internal gear ring (20).

7. A polishing method for an internal gear ring abrasive polishing fixture according to any one of claims 1-6, characterized in that, Includes the following steps: Step 1: Assemble the internal gear ring abrasive polishing fixture. The abrasive enters through the feed groove (31) and flows laterally through the machining gap to polish the tooth surface. Step 2: After completing one machining operation, the relative angle between the core (30) and the inner gear ring (20) is changed by adjusting the first positioning pin hole (11) and the second positioning pin hole (34), and the inner gear ring (20) is flipped up and down. Step 3: Repeated abrasive flow processing to eliminate fluid inlet and outlet effects through multi-station superposition.

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