Harmonic reducer outer gear shot blasting device

Abstract

The utility model discloses a kind of harmonic reducer outer gear shot blasting device, belong to surface processing technical field. Including positioning assembly and shielding fixture, positioning assembly includes the base of metal material and the sleeve made of non-metal material, base is located in the outer gear of flexible gear end, and one end is inserted into flexible gear interior, sleeve is sleeved on the outer wall of base, the outside of sleeve and flexible gear inner wall are pasted;Shielding fixture includes upper shielding piece and lower shielding piece, upper shielding piece and lower shielding piece are oppositely arranged in flexible gear end surface two sides, and upper shielding piece and lower shielding piece are equipped with placement cavity between, for accommodating flexible gear non-shot blasting area, upper shielding piece, lower shielding piece and flexible gear end surface are all soft contact;The shot blasting device of the utility model uses non-metal material as the core component contacted with workpiece, prevents the hard contact of metal equipment and precision gear surface, and fundamentally handles the scratch, knock and indentation etc. Problem generated when shot blasting.

Description

Technical Field

[0001] This utility model relates to the field of surface processing technology, and in particular to a shot peening device for the external gear of a harmonic reducer. Background Technology

[0002] Shot peening is a common surface strengthening process that uses a high-speed stream of shot to impact the surface of a workpiece. This impact removes minute surface defects and residual stress, forming a dense compressive stress layer that significantly improves surface hardness and wear resistance, increases the fatigue strength and service life of parts, and makes them better resistant to external erosion and internal stress damage. Shot peening is particularly important in the machining of precision transmission components such as the external gears of harmonic reducers.

[0003] Harmonic reducer flexures are prone to fatigue cracks under cyclic alternating stress, and the surface quality of critical components such as the tooth root determines the reliability and durability of the transmission system. Precise shot peening of the flexure's outer gear refines the grain structure, increases the density of the material surface, and enhances resistance to fretting wear and corrosion. The residual compressive stress field generated by the shot impact can offset some of the service tensile stress, delaying crack initiation and propagation. This allows the flexure to maintain excellent mechanical properties and extend its service life during high-frequency reciprocating motion, providing a guarantee for high-precision transmission systems.

[0004] Traditional shot peening equipment often uses metal materials for its shielding fixtures due to their high structural strength and durability, which can withstand the impact and wear of shot peening. However, metal is hard and lacks flexibility, which can easily cause hard scratches when it comes into contact with the surface of the flexible wheel, affecting the appearance and lifespan of the flexible wheel, as well as the overall performance and accuracy of the equipment. Utility Model Content

[0005] The technical problem to be solved by this utility model is: in order to solve the problem that the surface of the flexible gear is easily damaged due to the excessive hardness of the metal shielding fixture in the prior art, this utility model proposes a shot peening device for the external gear of a harmonic reducer. The shielding fixture uses non-metallic materials as the core component that contacts the workpiece, which prevents hard contact between the metal equipment and the surface of the precision gear, and fundamentally solves the problems of scratches, bumps and indentations caused during shot peening.

[0006] The technical solution adopted by this utility model to solve its technical problem is: a shot peening device for the external gear of a harmonic reducer, comprising: A positioning assembly for supporting the external gear of a flexible wheel includes a metal base and a sleeve made of a non-metallic material. The base is located at the end where the external gear of the flexible wheel is located, with one end extending into the interior of the flexible wheel. The axis of the base and the axis of the flexible wheel are on the same straight line. The sleeve is fitted onto the outer wall of the base, with the outer side of the sleeve fitting against the inner wall of the flexible wheel. A positioning port is provided at the other end of the base, which is used to rotate and engage with the positioning shaft of the shot peening device to achieve quick clamping and axial alignment of the flexible wheel. A shielding fixture for protecting the flange of a flexible wheel includes an upper shield and a lower shield. The upper and lower shields are disposed opposite to each other on both sides of the end face of the flexible wheel. The upper and lower shields are detachably connected. A placement cavity is provided between the upper and lower shields to accommodate the non-shot-peened area of ​​the flexible wheel. The upper and lower shields are in soft contact with the end face of the flexible wheel to avoid rigid friction and damage. Therefore, the upper and lower shielding parts are detachably connected to achieve quick positioning and installation, ensuring that the shielding fixture does not shift relative to each other during shot peening; while ensuring strong support, the positioning component effectively protects the integrity of the inner surface of the flexible wheel through a non-metallic sleeve.

[0007] Furthermore, the sleeve is made of soft silicone, and the upper and lower shielding parts are tenoned or bolted together.

[0008] Furthermore, the upper shielding member has a positioning groove on its end face near the lower shielding member, and the lower shielding member has a placement groove on its end face near the upper shielding member. The positioning groove and the placement groove are arranged opposite to each other to form a placement cavity. The lower shielding member is made of engineering plastic, and the shape of the placement groove is machined according to the contour of the non-shot-peened area of ​​the workpiece to physically isolate the shot and accurately protect the inner hole and specific shaft section of the workpiece. Thus, the lower shielding member has moderate hardness and good resilience, ensuring the shielding effect while avoiding mechanical damage to the end face of the flexible wheel.

[0009] Furthermore, the positioning groove is provided with a soft silicone pressure block. The side wall of the pressure block is clearance-fitted with the positioning groove. The thickness of the pressure block is greater than the depth of the positioning groove. During assembly, the pressure block is squeezed and undergoes elastic deformation, closely fitting the end face of the flexible wheel, avoiding direct contact between the upper shield and the flexible wheel, thereby further buffering the assembly stress and preventing surface scratches.

[0010] Furthermore, the depth of the placement groove is greater than or equal to the axial dimension of the non-shot-peened area of ​​the flexible wheel, ensuring that the lower shielding component is completely placed in the non-shot-peened area of ​​the flexible wheel, thus preventing the shot-peening medium from entering and causing surface damage; the pressure block generates a pre-tightening force after assembly, effectively filling the tiny gap between the upper shielding component and the end face of the flexible wheel, further improving the shielding and sealing performance.

[0011] Furthermore, both the upper and lower shielding components are annular structures; the positioning groove and the placement groove are coaxial annular grooves; thus, they are better adapted to the non-shot-peened area of ​​the flexible wheel, i.e., the flange area.

[0012] Furthermore, the sleeve is a T-shaped sleeve, with the vertical portion of the sleeve located inside the flexure, and the lateral portion of the sleeve extending to the end face of the outer gear of the flexure and providing radial support.

[0013] Furthermore, the base includes a T-shaped head, a tail component, and a limiting post. Both the vertical portion of the T-shaped head and the tail component are cylindrical structures, and are coaxially arranged. Through holes are formed on the end faces of the vertical portion of the T-shaped head and the tail component. The threaded shaft of the limiting post is threaded into the through holes, achieving a secure connection between the T-shaped head and the tail component. The positioning port is located at the top of the connecting post. Thus, the connecting post provides axial locking force to form an integral support frame between the T-shaped head and the tail component, ensuring the overall structure remains stable during shot peening.

[0014] Furthermore, the outer end face of the transverse portion of the sleeve fits against the inner end face of the transverse portion of the T-head, and the side wall of the tail component is provided with a positioning boss extending radially outward. The positioning boss is in the form of an arc-shaped platform or an annular platform. Thus, the sleeve is first fitted onto the outer circumference of the vertical portion of the T-head, and then the tail component is aligned with the T-head and the limiting post is tightened. The positioning boss and the transverse portion of the T-head cooperate to limit the sleeve on both sides, preventing the sleeve from moving axially.

[0015] Furthermore, the end face of the positioning boss near the T-head is an inclined guide surface, which guides the sleeve to slide smoothly into the predetermined position during the assembly process.

[0016] Furthermore, a gasket is provided between the vertical part of the T-head and the end face of the tail component; thus, the gasket absorbs part of the pre-tightening stress during the locking process of the limiting post, avoiding local stress concentration that could cause deformation of the base or sleeve, and ensuring that the support structure is evenly stressed; at the same time, the thickness of the gasket can be adjusted to match the distance between the positioning boss and the lateral part of the T-head, thereby achieving clamping of sleeves with different shaft lengths, and thus achieving compatibility adjustment for flexible wheels of different specifications.

[0017] Furthermore, the harmonic reducer external gear shot peening device also includes a support column, and the lower shielding member is fixedly sleeved on the outer periphery of the support column. The end of the support column away from the lower shielding member is fixedly connected to the rotating part of the shot peening device. Thus, with the external gear part of the flexible wheel facing upward, the support column drives the flange part of the flexible wheel to rotate through the shielding fixture, thereby realizing the overall rotation of the flexible wheel. Compared with the traditional assembly scheme that controls the rotation of the external gear of the flexible wheel through a rotating shaft and the flange part of the flexible wheel rotates accordingly, the present invention provides rotation of the flexible wheel synchronously through the positioning component and the support column, avoiding radial deformation of the flexible wheel.

[0018] The beneficial effects of this utility model are that the shot peening device for the external gear of the harmonic reducer of this utility model replaces the traditional metal shielding parts with a soft silicone sleeve, a plastic lower shielding part, and a soft silicone pressure block, effectively avoiding hard contact between the metal device and the surface of the precision gear, and completely solving the problems of scratches, bumps and indentations during the shot peening process; in addition, the plastic lower shielding part reduces the weight of the shielding fixture and avoids deformation of the middle section of the flexible gear due to the lag rotation of the shielding fixture.

[0019] The shot peening device for the external gear of the harmonic reducer of this utility model uses a soft silicone pressure block and a soft silicone sleeve to provide uniform pressure when pressing the workpiece, thus avoiding indentation.

[0020] The harmonic reducer external gear shot peening device of this utility model forms a base by setting a T-shaped head, tail component and limiting post to form a support structure for the positioning component; and the axial positioning of the sleeve is achieved by the cooperation of the T-shaped head and the positioning boss; the base, sleeve and lower shielding component cooperate to achieve precise positioning and area control of the device. Attached Figure Description

[0021] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0022] Figure 1 This is a cross-sectional schematic diagram of the shot peening device for the external gear of the harmonic reducer in Embodiment 1.

[0023] Figure 2 yes Figure 1 A cross-sectional schematic diagram of the central shading component.

[0024] Figure 3 This is a cross-sectional schematic diagram of the shot peening device for the external gear of the harmonic reducer in Embodiment 2.

[0025] Figure 4 yes Figure 3 A cross-sectional view of the positioning component.

[0026] Figure 5 yes Figure 4 A bottom-view diagram of the positioning component.

[0027] Figure 6 This is a bottom view of the positioning component in Embodiment 3.

[0028] In the diagram: 11. Base; 111. T-head; 112. Tail assembly; 1121. Positioning boss; 113. Limiting post; 1131. Positioning port; 12. Sleeve; 13. Gasket; 21. Upper shield; 211. Positioning groove; 22. Lower shield; 221. Placement groove; 23. Pressure block; 3. Flexible wheel; 4. Support post. Detailed Implementation

[0029] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the present invention, and therefore only show the components relevant to the present invention.

[0030] Example 1: like Figure 1 , Figure 2As shown, a shot peening device for the external gear of a harmonic reducer includes a positioning assembly for supporting the external gear of the flexible gear 3, a shielding fixture for protecting the flange of the flexible gear 3, and a support column 4. Reference Figure 1 The positioning assembly includes a metal base 11 and a soft silicone sleeve 12. The base 11 is a T-shaped column and is located at the end where the external gear of the flexible wheel 3 is located. The vertical part of the base 11 extends into the interior of the flexible wheel 3, and the axis of the base 11 and the axis of the flexible wheel 3 are on the same straight line. The other end of the base 11 is provided with a positioning port 1131, which is used to rotate with the positioning shaft of the shot peening device to realize the quick clamping and axial alignment of the flexible wheel 3. The soft silicone sleeve 12 is a T-shaped sleeve, which is fitted onto the outer wall of the base 11. The vertical part of the sleeve 12 is located inside the flexible wheel 3, and the horizontal part of the sleeve 12 extends to the end face of the outer gear of the flexible wheel 3 and provides radial support. Thus, the soft silicone sleeve 12 avoids direct contact between the base 11 and the flexible wheel 3, effectively preventing surface damage caused by rigid contact. At the same time, it relies on its elastic deformation to avoid deformation of the outer gear part of the flexible wheel 3 caused by traditional assembly.

[0031] Reference Figure 1 , Figure 2 The shielding fixture includes an upper shielding member 21 and a lower shielding member 22, both of which are annular structures. The upper shielding member 21 and the lower shielding member 22 are disposed opposite to each other on both sides of the end face of the flexible wheel 3, and the upper shielding member 21 and the lower shielding member 22 are tenoned together. The upper shield 21 has an annular positioning groove 211 on its end face near the lower shield 22, and the lower shield 22 has an annular placement groove 221 on its end face near the upper shield 21. The positioning groove 211 and the placement groove 221 are arranged opposite to each other to form a placement cavity. The end of the lower shield 22 away from the upper shield 21 is fixedly sleeved on the end of the support column 4, and the end of the support column 4 away from the lower shield 22 is fixedly connected to the rotating part of the shot peening device.

[0032] The lower shielding component 22 is made of engineering plastic, and the shape of the placement groove 221 is machined according to the contour of the non-shot-peened area of ​​the workpiece. It is used to physically isolate the shot to accurately protect the inner hole and specific shaft section of the workpiece. Therefore, the lower shielding component 22 has moderate hardness and good resilience, ensuring the shielding effect while avoiding mechanical damage to the end face of the flexible wheel 3. Contour-based machining can improve positioning accuracy and shielding accuracy, ensuring that the non-shot-peened area is completely free from shot impact.

[0033] The positioning groove 211 is provided with a soft silicone pressure block 23. The side wall of the pressure block 23 is clearance-fitted with the positioning groove 211. The thickness of the pressure block 23 is greater than the depth of the positioning groove 211. During assembly, the pressure block 23 is squeezed and undergoes elastic deformation, closely fitting the end face of the flexible wheel 3, avoiding direct contact between the upper shield 21 and the flexible wheel 3, thereby further buffering the assembly stress and preventing surface scratches.

[0034] Its working process is as follows: First, sleeve 12 is fitted onto the outer wall of base 11. Then, the vertical part of base 11 is inserted into the inside of flexible wheel 3, so that the vertical part of sleeve 12 is located inside flexible wheel 3, and the horizontal part abuts against the end face of external gear to provide radial support. Then, flexible wheel 3 with positioning component installed is assembled with lower shield 22. The flange of flexible wheel 3 is placed in placement groove 221, and pressure block 23 is placed above flange of flexible wheel 3. The upper shield 21 and lower shield 22 are then joined together and locked by tenon joint structure, while ensuring that pressure block 23 is located in positioning groove 211.

[0035] Finally, the positioning port 1131 at the other end of the base 11 is rotated and engaged with the positioning shaft of the shot peening device to achieve axial positioning and quick clamping. Then, the lower shield 22 is fitted onto the end of the support column 4 and fixed. At this time, the external gear part of the flexible wheel 3 is facing upward, and the support column 4 drives the flange part of the flexible wheel 3 to rotate through the shield fixture, thereby realizing the overall rotation of the flexible wheel 3. Compared with the traditional assembly scheme that controls the rotation of the external gear of the flexible wheel 3 through a rotating shaft and the flange part of the flexible wheel 3 follows the rotation, this utility model provides rotation of the flexible wheel 3 synchronously through the positioning component and the support column 4, while reducing the weight of the shield fixture, thereby reducing the probability of radial deformation of the flexible wheel 3. In addition, this utility model effectively reduces the rigid contact stress during the assembly process through the synergistic effect of the plastic lower shield and the soft silicone pressure block, reducing the risk of damage to the end face of the flexible wheel; at the same time, the contour-machined placement groove and the clearance-fit pressure block together improve the positioning accuracy.

[0036] Example 2: Based on Example 1, the vertical part of the base 11 is optimized so that the base 11 can axially limit the sleeve 12, preventing axial movement of the sleeve 12 during assembly or operation, and ensuring that it is always stably located inside the flexible wheel 3 and in close contact with the end face of the external gear. The specific solution is as follows: Reference Figure 3 , Figure 4 The base 11 includes a T-shaped head, a tail component 112, and a limiting post 113. The vertical part of the T-shaped head and the tail component 112 are both cylindrical structures, and the vertical part of the T-shaped head and the tail component 112 are coaxially arranged. The vertical part of the T-shaped head and the end face of the tail component 112 are provided with through holes. The thread of the limiting post 113 is set in the through hole to realize the fastening connection between the T-shaped head and the tail component 112. The positioning port 1131 is set at the top of the connecting post.

[0037] Reference Figure 4 , Figure 5 The outer end face of the transverse portion of the sleeve 12 fits against the inner end face of the transverse portion of the T-head. The side wall of the tail component 112 is provided with a positioning boss 1121 extending radially outward. The positioning boss 1121 has a circular arc platform structure and multiple bosses are evenly arranged circumferentially. Thus, the sleeve 12 is first fitted onto the outer periphery of the vertical portion of the T-head, and then the tail component 112 is aligned with the T-head and the limiting post 113 is tightened. The positioning boss 1121 and the transverse portion of the T-head cooperate to limit the sleeve 12 on both sides, preventing the sleeve 12 from moving axially.

[0038] Among them, the end face of the positioning boss 1121 near the T-head is an inclined guide surface, which guides the sleeve 12 to slide smoothly into the predetermined position during the assembly process.

[0039] Example 3: Based on Example 2, a replacement structure is proposed for the positioning boss 1121, specifically as follows: Refer to Figure 4 , Figure 6 The positioning boss 1121 has a circular structure and a right-angled trapezoidal cross-section.

[0040] Example 4: To enable the base 11 to adapt to sleeves 12 of different lengths and provide better support for the flexible wheel 3, optimizations are proposed based on Examples 2 and 3, as follows: Reference Figure 3 Multiple shims 13 of different thicknesses are provided between the vertical part of the T-head and the end face of the tail component 112. Thus, the shims 13 absorb part of the pre-tightening stress during the locking process of the limiting post 113, avoiding local stress concentration that could cause deformation of the base 11 or sleeve 12, and ensuring that the support structure is evenly stressed. At the same time, the thickness of the shims 13 can be adjusted to match the distance between the positioning boss 1121 and the lateral part of the T-head, thereby achieving clamping of sleeves 12 with different shaft lengths, and thus achieving compatibility adjustment of flexible wheels 3 of different specifications.

[0041] Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A shot peening device for an external gear of a harmonic reducer, characterized by, include: A positioning component is provided to support the external gear of the flexible wheel (3). The positioning component includes a metal base (11) and a sleeve (12) made of non-metallic material. The base (11) is located at the end of the external gear of the flexible wheel (3) and one end extends into the interior of the flexible wheel (3). The axis of the base (11) is on the same straight line as the axis of the flexible wheel (3). The sleeve (12) is fitted on the outer wall of the base (11) and the outer side of the sleeve (12) is in contact with the inner wall of the flexible wheel (3). The other end of the base (11) is provided with a positioning port (1131) for rotating cooperation with the positioning shaft of the shot peening device. A shielding fixture is used to protect the flange of the flexible wheel (3). The shielding fixture includes an upper shielding member (21) and a lower shielding member (22). The upper shielding member (21) and the lower shielding member (22) are disposed opposite to each other on both sides of the end face of the flexible wheel (3). The upper shielding member (21) and the lower shielding member (22) are detachably connected. A placement cavity is provided between the upper shielding member (21) and the lower shielding member (22) to accommodate the non-shot-peened area of ​​the flexible wheel (3). The upper shielding member (21), the lower shielding member (22) and the end face of the flexible wheel (3) are in soft contact.

2. The shot peening device for the external gear of the harmonic reducer as described in claim 1, characterized in that: The upper shielding member (21) has a positioning groove (211) on its end face near the lower shielding member (22), and the lower shielding member (22) has a placement groove (221) on its end face near the upper shielding member (21). The positioning groove (211) and the placement groove (221) are arranged opposite to each other to form a placement cavity. The lower shielding member (22) is made of engineering plastic material, and the shape of the placement groove (221) is modeled according to the contour of the non-shot-peened area of ​​the workpiece.

3. The shot peening device for the external gear of the harmonic reducer as described in claim 2, characterized in that: The positioning groove (211) is provided with a soft silicone pressure block (23), the side wall of the pressure block (23) and the positioning groove (211) are fitted with a clearance, and the thickness of the pressure block (23) is greater than the depth of the positioning groove (211).

4. The shot peening device for the external gear of the harmonic reducer as described in claim 2, characterized in that: The sleeve (12) is made of soft silicone, and the upper shield (21) and the lower shield (22) are tenoned or connected by bolts.

5. The shot peening device for the external gear of the harmonic reducer as described in claim 4, characterized in that: The upper shield (21) and the lower shield (22) are both annular structures, and their inner diameters are adapted to the outer diameter of the flexible wheel (3); the positioning groove (211) and the placement groove (221) are both coaxial annular grooves.

6. The shot peening device for the external gear of the harmonic reducer as described in claim 4, characterized in that: The sleeve (12) is a T-shaped sleeve. The vertical part of the sleeve (12) is located inside the flexible wheel (3), and the horizontal part of the sleeve (12) extends to the end face of the outer gear of the flexible wheel (3) and provides radial support.

7. The shot peening device for the external gear of the harmonic reducer as described in claim 6, characterized in that: The base (11) includes a T-shaped head, a tail component (112), and a limiting post (113). The vertical part of the T-shaped head and the tail component (112) are both cylindrical structures, and the vertical part of the T-shaped head and the tail component (112) are coaxially arranged. The vertical part of the T-shaped head and the end face of the tail component (112) are provided with through holes. The column body of the limiting post (113) is threaded in the through hole. The positioning port (1131) is located at the top of the connecting post.

8. The shot peening device for the external gear of the harmonic reducer as described in claim 7, characterized in that: The outer end face of the lateral portion of the sleeve (12) is in contact with the inner end face of the lateral portion of the T-head. The side wall of the tail component (112) is provided with a positioning boss (1121) extending radially outward. The positioning boss (1121) is in the form of a circular arc platform or a circular ring platform. The end face of the positioning boss (1121) near the T-head is an inclined guide surface.

9. The shot peening device for the external gear of the harmonic reducer as described in claim 7, characterized in that: A gasket (13) is provided between the vertical part of the T-head and the end face of the tail component (112).

10. The shot peening device for the external gear of the harmonic reducer as described in claim 9, characterized in that: The harmonic reducer external gear shot peening device also includes a support column (4), and the end of the lower shield (22) away from the upper shield (21) is fixedly sleeved on one end of the support column (4), and the end of the support column (4) away from the lower shield (22) is fixedly connected to the rotating part of the shot peening device.

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