Variable-diameter tool for strengthening shot blasting of sheet gear and strengthening shot blasting method

Abstract

The invention relates to a gear machining tool and a machining method, in particular to a variable-diameter tool for sheet gear strengthening shot blasting and a strengthening shot blasting method, and aims at solving the problems that an existing sheet gear strengthening shot blasting tool is not high in universality and complex in operation. The tool comprises an inverted-cone-shaped pressing block, a mandrel base, a base connecting shaft, four mandrel units, four springs, four guide rods, four springs and four guide sliding blocks. The mandrel base is a hollow cylinder with an opening in the lower end, a cross groove penetrating through the interior of the mandrel base is formed in the upper end face of the mandrel base, the inverted-cone-shaped pressing block is used for receiving pressure from the upper bottom face and then moving downwards, the four mandrel units are pushed to move in the radial direction away from the circle center of the mandrel base, and meanwhile the four springs are compressed; the outer end surfaces of the four core shaft units are all propped against the inner ring surface of the to-be-strengthened shot blasting treatment sheet gear. According to the invention, different sheet gears can be dynamically adapted and fixed, and the universality is high.

Description

Technical Field

[0001] The present invention relates to a gear processing tool and a processing method, and in particular to a variable diameter tool for enhanced shot peening of a blade gear and an enhanced shot peening method. Background Art

[0002] The intensive shot peening process is a cold working technology that bombards the surface of metal parts with a high-speed projectile stream, causing them to undergo plastic deformation and implant a residual compressive stress layer. It aims to significantly improve the fatigue strength, wear resistance and corrosion resistance of the parts. At the same time, in the field of vehicles and vehicle accessories, this process is crucial for improving the service life of mining vehicles, new energy vehicles, AMT (Automated Manual Transmission, electronically controlled mechanical automatic transmission gears) and gear shaft parts.

[0003] Before being put into use, the blade gears usually need to undergo a strengthening shot peening process. In the process control of the strengthening shot peening process, reasonable tooling design is one of the key factors influencing the quality of the strengthening shot peening process and improving production efficiency. Most of the existing tooling used for the strengthening shot peening process of blade gears is a fixed diameter mandrel structure, and each diameter of blade gear requires a mandrel of the corresponding diameter to match it. However, there are many types of blade gears that need to undergo the strengthening shot peening process, the structural dimensions of the parts vary greatly, and the inner diameter dimensions vary greatly. If the appropriate tooling is designed according to the inner diameter dimensions of each part, it is very easy to cause a wide variety of tooling types, low utilization rate of each tooling, and high tooling production costs.

[0004] To address the above issues, the referenced document CN219113795U discloses a universal intensive shot peening tool. The tool comprises a mandrel, a gland, and several auxiliary sleeves that are sleeved onto the mandrel body. The mandrel comprises a mandrel base and a mandrel body. The lower portion of the mandrel base is provided with connecting threads for connection to the intensive shot peening equipment. The inner diameter of the mandrel body matches the part to be processed. The upper end of the gland is connected to the intensive shot peening equipment. When assembled, the auxiliary sleeves protrude above the top of the mandrel body. The lowermost auxiliary sleeve presses against the upper surface of the part to be processed, and the gland presses against the upper surface of the uppermost auxiliary sleeve. This solves the technical problems of existing intensive shot peening tooling, which suffer from a wide variety of tooling types, low tooling utilization, and high production costs. It offers advantages such as high versatility, high efficiency, time savings, cost reduction, and increased production capacity. However, this patent suffers from the following drawbacks: during processing, only gears with the same inner diameter can share a single mandrel. For gears with different inner diameters, a mandrel body with a different diameter must be replaced, increasing the complexity of the operation and limiting its versatility.

[0005] In addition, the comparative document CN220012718U discloses a combined strengthening shot peening tool, comprising a gland, a base, a gasket, at least one auxiliary mandrel, and / or at least one auxiliary bushing. The gland is used to press against the upper surface of the part to be treated. The middle portion of the lower end of the auxiliary mandrel is a stepped shaft structure, and the middle portion of the upper end is provided with a second stepped hole that matches the stepped shaft structure. The upper end of the base is provided with a first stepped hole that matches the stepped shaft structure. The auxiliary bushing is mounted on the outside of the auxiliary mandrel or the outside of the base, and after assembly, it is not lower than the auxiliary mandrel or the base. The part to be treated is mounted on the outside of the auxiliary bushing. This solves the technical problems of existing strengthening shot peening tooling, such as the wide variety of types, low tooling utilization, and high production costs, and has the advantages of high tooling efficiency, time saving, cost reduction, and increased production capacity. However, a shortcoming of this patent is that although the base does not need to be replaced when the tooling is replaced, the gasket or bushing still needs to be replaced, which also poses the problem of complex operation.

[0006] In summary, the existing gear strengthening shot peening tooling has the problems of low versatility and complicated operation. Summary of the Invention

[0007] The purpose of the present invention is to solve the problems of low versatility and complicated operation of existing tooling for strengthening shot peening of gears, and to provide a variable diameter tooling for strengthening shot peening of gears and a strengthening shot peening method.

[0008] To achieve the above objectives, the technical solutions provided by the present invention are:

[0009] A variable diameter tool for reinforced shot peening of gears, which is special in that:

[0010] The cam is provided with a plurality of guide rods, a plurality of guide rods and a plurality of guide rods, and a plurality of guide rods are connected to the cam. The ends are each provided with a guide inclined surface, and the four guide inclined surfaces are adapted to the conical surface of the inverted conical pressure block, and the inverted conical pressure block is provided on the four guide inclined surfaces; the four guide members are respectively arranged in the four extension arms of the cross slot, and can all move radially along the corresponding extension arms; the four guide sliders are respectively connected to the lower ends of the four guide members, and each guide slider is provided with a second guide rod mounting hole along the radial direction of the core shaft base; the four guide rods respectively pass through the corresponding first guide rod mounting hole and the second guide rod mounting hole in turn, and are connected to the corresponding third guide rod mounting hole; the four springs are respectively sleeved on the corresponding guide rods, and are located between the first guide rod mounting hole and the second guide rod mounting hole; the inverted conical pressure block is used to receive the pressure from the upper bottom surface and then move downward, pushing the four core shaft units to move radially in a direction away from the center of the core shaft base, and at the same time, the four springs are compressed until the outer end faces of the four core shaft units abut against the inner ring surface of the gear to be strengthened and shot peened.

[0011] Furthermore, the angle between the generatrix and the central axis of the inverted conical pressing block is 30° to 45°.

[0012] Furthermore, the circular connecting member includes a lower cylinder connected to the lower end face of the core shaft base, and an upper cylinder connected to the upper end face of the lower cylinder; the lower cylinder and the upper cylinder are both circular and coaxially arranged, the radius of the lower cylinder is greater than the radius of the upper cylinder, and a limiting step is formed between the upper end face of the lower cylinder and the outer side wall of the upper cylinder; the positions of the lower ends of the four support columns close to the center of the core shaft base are all stepped and adapted to the limiting steps; the lower cylinder and the upper cylinder are jointly used to limit the stroke of the four core shaft units.

[0013] Furthermore, a radially penetrating disassembly hole is provided on the side wall of the base connecting shaft below the four third guide rod mounting holes for disassembly and assembly of the base connecting shaft.

[0014] Furthermore, the upper end face of the base connecting shaft is provided with a base connecting shaft connecting hole, and the middle part of the circular connecting member is provided with a circular connecting member connecting hole, and the base connecting shaft and the circular connecting member are detachably connected by screws passing through the circular connecting member connecting hole and the base connecting shaft connecting hole; the lower end face of the base connecting shaft is provided with a threaded end for connecting to the rotating mechanism of the enhanced shot blasting machine.

[0015] Furthermore, each of the guide members is provided with a longitudinal guide member connecting hole, and each guide slider is provided with a longitudinal guide slider connecting hole at a position corresponding to the guide member; each of the guide members and the corresponding guide slider are detachably connected by screws passing through the guide member connecting hole and the guide slider connecting hole.

[0016] Furthermore, the inner end of each guide rod is a threaded end, which is threadedly connected to the corresponding third guide rod mounting hole on the base connecting shaft; the outer end of each guide rod is provided with a slotted nut for easy disassembly.

[0017] At the same time, the present invention also provides a method for strengthening shot peening of a blade gear, which is based on the above-mentioned variable diameter tooling for strengthening shot peening of a blade gear, and is special in that it includes the following steps:

[0018] Step 1: Connect the base connecting shaft to the circular connector of the mandrel base, and ensure that each first guide rod mounting hole is concentric with a corresponding third guide rod mounting hole;

[0019] Step 2: Install the four spindle units at the corresponding positions of the cross slots, and then connect the guide members on each spindle unit to a guide slider;

[0020] Step 3: Pass the four guide rods through the corresponding first guide rod mounting holes, the spring, the second guide rod mounting holes on the guide slider, and the third guide rod mounting holes on the base connecting shaft respectively;

[0021] Step 4: Connect the threaded end of the base connecting shaft to the rotating mechanism of the enhanced shot blasting machine;

[0022] Step 5: Sleeve the gear to be shot peened on the outer end surfaces of the four core shaft units, and then continuously apply downward pressure to the upper end surface of the inverted conical pressing block through a pressure device until the outer end surfaces of the four core shaft units just abut against the inner annular surface of the gear to be shot peened;

[0023] Step 6: The rotating mechanism of the shot peening machine starts to rotate, and drives the mandrel base, four mandrel units and the plate gear to rotate at the same angular velocity in sequence through the base connecting shaft. After the speed stabilizes, the shot peening treatment of the plate gear begins;

[0024] Step 7: After the strengthening shot peening treatment of the gear is completed, the gear is removed to complete the strengthening shot peening treatment of the gear.

[0025] Furthermore,

[0026] In step 1, connect the base connecting shaft to the circular connector of the mandrel base with screws;

[0027] In step 2, the guide members on each spindle unit are connected to a guide slider via screws.

[0028] Compared with the prior art, the present invention has the following beneficial effects:

[0029] 1. The variable diameter tooling for enhanced shot peening of the blade gears provided by the present invention can dynamically adapt and fix blade gears of different sizes according to the radial movement distance of the four core shaft units, so that the blade gears rotate at the same angular velocity as the tooling during enhanced shot peening, which is beneficial to the enhanced shot peening and has strong versatility.

[0030] 2. The variable diameter tooling for the enhanced shot peening of the blade gear provided by the present invention reduces the tooling replacement frequency and improves production efficiency compared with the prior art.

[0031] 3. The variable diameter tooling for the blade gear strengthening shot peening provided by the present invention, the presence of the lower cylinder and the upper cylinder effectively prevents the four core shaft units from colliding with each other when they move to the center of the core shaft base.

[0032] 4. The chip gear strengthening shot peening method provided by the present invention can dynamically adapt to chip gears of different sizes. After the shot peening treatment of one chip gear is completed, the completed chip gear can be conveniently removed and replaced with another chip gear of a different size, which greatly improves production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 Schematic diagram of the structure of the variable diameter tooling for strengthening shot peening of the blade gear of the present invention Figure 1 ;

[0034] Figure 2 Schematic diagram of the assembly of a variable diameter tooling embodiment for enhanced shot peening of a blade gear and a blade gear according to the present invention;

[0035] Figure 3 Schematic diagram of the structure of the mandrel unit in an embodiment of the variable diameter tooling for enhanced shot peening of a blade gear of the present invention;

[0036] Figure 4 A cross-sectional view of a mandrel unit in an embodiment of a variable diameter tooling for enhanced shot peening of a blade gear according to the present invention;

[0037] Figure 5A top view of the mandrel base of an embodiment of a variable diameter tooling for enhanced shot peening of a blade gear according to the present invention;

[0038] Figure 6 A cross-sectional view of a mandrel base in an embodiment of a variable diameter tooling for enhanced shot peening of a blade gear according to the present invention;

[0039] Figure 7 This is a schematic structural diagram of the base connecting shaft in an embodiment of a variable diameter tooling for enhanced shot peening of a blade gear according to the present invention;

[0040] Figure 8 Schematic diagram of the structure of the inverted conical pressing block in the embodiment of the variable diameter tooling for reinforced shot peening of the blade gear of the present invention;

[0041] Figure 9 This is a schematic structural diagram of a guide slider in an embodiment of a variable diameter tooling for enhanced shot peening of a blade gear according to the present invention;

[0042] Figure 10 Schematic diagram of the structure of the guide rod in the embodiment of the variable diameter tooling for enhanced shot peening of the blade gear of the present invention;

[0043] Figure 11 Schematic diagram of the structure of the spring in the embodiment of the variable diameter tooling for reinforced shot peening of a blade gear of the present invention;

[0044] Figure 12 Schematic diagram of the structure of the variable diameter tooling for strengthening shot peening of the blade gear of the present invention Figure 2 ;

[0045] Figure 13 Schematic diagram of the assembly structure of the mandrel base and four mandrel units in an embodiment of the variable diameter tooling for enhanced shot peening of a blade gear of the present invention;

[0046] Figure 14 Schematic diagram of the assembly structure of the mandrel base and the base connecting shaft in an embodiment of the variable diameter tooling for enhanced shot peening of a blade gear of the present invention;

[0047] Description of reference numerals:

[0048] 1-inverted conical pressure block; 2-core shaft unit, 21-guide slope, 22-support column, 23-guide part, 231-guide part connecting hole; 3-core shaft base, 31-cross slot, 32-upper column, 33-lower column, 321-circular connecting part connecting hole, 34-first guide rod mounting hole; 4-base connecting shaft, 41-threaded end, 42-third guide rod mounting hole, 43-base connecting shaft connecting hole, 44-disassembly hole; 5-guide rod, 6-spring, 7-gear, 8-guide slider, 81-guide slider connecting hole, 82-second guide rod mounting hole. DETAILED DESCRIPTION

[0049] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0050] A variable diameter tool for strengthening shot peening of gears, see Figure 1 、 Figure 2 、 Figures 12 to 14 ; Includes an inverted conical pressure block 1, a mandrel base 3, a base connecting shaft 4, and four mandrel units 2, four springs 6, four guide rods 5, four springs 6 and four guide sliders 8;

[0051] See also Figure 5 and Figure 6 The spindle base 3 is a hollow cylinder with an open lower end, and a cross groove 31 is provided on the upper end surface thereof, and first guide rod mounting holes 34 are provided at the positions of the four extension arms of the cross groove 31 corresponding to the lower end of the side ring surface of the spindle base 3; a circular connector connected to the spindle base 3 is provided at the center of the cross groove 31, and the upper end surface of the base connecting shaft 4 extends into the spindle base 3 from below and is connected to the circular connector;

[0052] The circular connector includes a lower cylinder 33 connected to the lower end face of the spindle base 3, and an upper cylinder 32 connected to the upper end face of the lower cylinder 33. The lower cylinder 33 and the upper cylinder 32 are both circular and coaxially arranged. The radius of the lower cylinder 33 is greater than the radius of the upper cylinder 32, and a limiting step is formed between the upper end face of the lower cylinder 33 and the outer wall of the upper cylinder 32. The lower ends of the four support columns 22 near the center of the spindle base 3 are all stepped and compatible with the limiting step. The lower cylinder 33 and the upper cylinder 32 are used together to limit the travel of the four spindle units 2. The presence of the step can prevent the four spindle units 2 from colliding with each other when moving to the center, thereby enhancing the reliability of the overall tooling.

[0053] See also Figure 7 , four third guide rod mounting holes 42 are provided on the side wall of the base connecting shaft 4 and are evenly distributed around the circumference and correspond to the positions of the four first guide rod mounting holes 34;

[0054] See also Figure 3 and Figure 4 Each core shaft unit 2 includes a support column 22 and a guide member 23 connected to the bottom of the support column 22; the cross-sectional shape of each support column 22 is a sector with a central angle of 90°, and the centers of the four sectors are close to the center of the core shaft base 3, and the guide member 23 is located on the side of the support column 22 away from the center; the upper end of each support column 22 is provided with a guide slope 21, and the four guide slopes 21 are adapted to the conical surface of the inverted conical pressing block 1, and the inverted conical pressing block 1 is provided on the four guide slopes 21; see Figure 8 The angle between the busbar and the central axis of the inverted conical pressing block 1 is 45°. In actual application scenarios, the angle can be adjusted according to actual needs.

[0055] The four guide members 23 are respectively arranged in an extension arm of the cross slot 31 and can move radially along the corresponding extension arm;

[0056] See also Figure 9 , the four guide sliders 8 are respectively connected to the lower ends of the four guide members 23, and each guide slider 8 is provided with a second guide rod mounting hole 82 along the radial direction of the core shaft base 3;

[0057] See also Figure 10 and Figure 11 The four guide rods 5 pass through the corresponding first guide rod mounting hole 34 and the second guide rod mounting hole 82 in sequence and are connected to the corresponding third guide rod mounting hole 42; the four springs 6 are respectively sleeved on the corresponding guide rods 5 and located between the first guide rod mounting hole 34 and the second guide rod mounting hole 82; a through disassembly hole 44 is provided on the side wall of the base connecting shaft 4 below the four third guide rod mounting holes 42 for disassembling and assembling the base connecting shaft 4.

[0058] The inverted conical pressure block 1 is used to receive the pressure from the upper bottom surface and move downward, pushing the four core shaft units 2 to move radially in the direction away from the center of the core shaft base 3. At the same time, the four springs 6 are compressed until the outer end faces of the four core shaft units 2 are in contact with the inner ring surface of the gear 7 to be strengthened and shot peened.

[0059] The upper end surface of the base connecting shaft 4 is provided with a base connecting shaft connection hole 43, and the central portion of the circular connector is provided with a circular connector connection hole 321. The base connecting shaft 4 and the circular connector are detachably connected via an M5 screw that passes through the circular connector connection hole 321 and into the base connecting shaft connection hole 43. The lower end surface of the base connecting shaft 4 is provided with a threaded end 41 for connection to the rotary mechanism of the enhanced shot peening machine. Each guide member 23 is provided with a longitudinal guide member connection hole 231, and each guide slider 8 is provided with a longitudinal guide slider connection hole 81 at a position corresponding to the guide member 23. Each guide member 23 and the corresponding guide slider 8 are detachably connected via an M5 screw that passes through the guide member connection hole 231 and into the guide slider connection hole 81. This arrangement enhances versatility.

[0060] The inner end of each guide rod 5 is a threaded end 41, which is threadedly connected to the corresponding third guide rod mounting hole 42 on the base connecting shaft 4; the outer end of each guide rod 5 is provided with a slotted nut for easy disassembly.

[0061] At the same time, this embodiment also provides a method for strengthening shot peening of a blade gear, based on the variable diameter tooling for strengthening shot peening of a blade gear, comprising the following steps:

[0062] Step 1: Connect the base connecting shaft 4 to the circular connector of the mandrel base 3 with screws, and ensure that each first guide rod mounting hole 34 is concentric with a corresponding third guide rod mounting hole 42;

[0063] Step 2: Install the four core shaft units 2 at the corresponding positions of the cross slot 31 respectively, and then connect the guide piece 23 on each core shaft unit 2 to a guide slider 8 by screws;

[0064] Step 3: Pass the four guide rods 5 through the corresponding first guide rod mounting holes 34, the spring 6, the second guide rod mounting holes 82 on the guide slider 8, and the third guide rod mounting holes 42 on the base connecting shaft 4 in sequence;

[0065] Step 4: Connect the threaded end 41 of the base connecting shaft 4 to the rotating mechanism of the enhanced shot blasting machine;

[0066] Step 5: Sleeve the blade gear 7 to be subjected to the enhanced shot peening treatment on the outer end surfaces of the four core shaft units 2, and then continuously apply downward pressure to the upper end surface of the inverted conical pressing block 1 through the pressure device until the outer end surfaces of the four core shaft units 2 just abut against the inner annular surface of the blade gear 7 to be subjected to the enhanced shot peening treatment;

[0067] Step 6: The rotating mechanism of the shot peening machine starts to rotate, and drives the spindle base 3, the four spindle units 2 and the sheet gear 7 to rotate at the same angular velocity in sequence through the base connecting shaft 4. After the speed stabilizes, the sheet gear 7 begins to be shot peened;

[0068] Step 7: After the strengthening shot peening treatment of the blade gear 7 is completed, the blade gear 7 is removed to complete the strengthening shot peening treatment of the blade gear.

[0069] After step 7 is completed, if there are other sizes of gears 7 to be subjected to shot peening, the process returns to step 1 and is repeated.

Claims

1. A variable diameter tool for strengthening shot peening of a blade gear, characterized by: It comprises an inverted conical pressing block (1), a core shaft base (3), a base connecting shaft (4), four core shaft units (2), four springs (6), four guide rods (5), four springs (6) and four guide slide blocks (8); The spindle base (3) is a hollow cylinder with an open lower end, and a cross groove (31) is provided on the upper end surface thereof, and first guide rod mounting holes (34) are provided at the lower end of the side ring surface of the spindle base (3) at positions corresponding to the four extension arms of the cross groove (31); a circular connecting piece connected to the spindle base (3) is provided at the center of the cross groove (31), and the upper end surface of the base connecting shaft (4) extends into the spindle base (3) from below and is connected to the circular connecting piece; Four third guide rod mounting holes (42) corresponding to the positions of the four first guide rod mounting holes (34) are provided on the side wall of the base connecting shaft (4); Each of the core shaft units (2) comprises a support column (22) and a guide member (23) connected to the bottom of the support column (22); the cross-sectional shape of each of the support columns (22) is a sector with a central angle of 90°, and the centers of the four sectors are close to the center of the core shaft base (3), and the guide member (23) is located on the side of the support column (22) away from the center; the upper end of each support column (22) is provided with a guide slope (21), and the four guide slopes (21) are adapted to the conical surface of the inverted conical pressure block (1), and the inverted conical pressure block (1) is provided on the four guide slopes (21); the four guide members (23) are respectively provided in the four extension arms of the cross slot (31), and can move radially along the corresponding extension arms; The four guide sliders (8) are respectively connected to the lower ends of the four guide members (23), and each guide slider (8) is provided with a second guide rod mounting hole (82) along the radial direction of the core shaft base (3); The four guide rods (5) respectively pass through the corresponding first guide rod mounting hole (34) and the second guide rod mounting hole (82) in sequence and are connected to the corresponding third guide rod mounting hole (42); the four springs (6) are respectively sleeved on the corresponding guide rods (5) and are located between the first guide rod mounting hole (34) and the second guide rod mounting hole (82); The inverted conical pressure block (1) is used to receive pressure from the upper bottom surface and then move downward, pushing the four core shaft units (2) to move radially in a direction away from the center of the core shaft base (3), and at the same time, the four springs (6) are compressed until the outer end surfaces of the four core shaft units (2) are in contact with the inner ring surface of the gear (7) to be strengthened and shot peened.

2. The variable diameter tool for strengthening shot peening of a blade gear according to claim 1, characterized in that: The angle between the generatrix and the central axis of the inverted conical pressing block (1) is 30° to 45°.

3. The variable diameter tool for strengthening shot peening of a blade gear according to claim 2, characterized in that: The circular connecting member comprises a lower cylinder (33) connected to the lower end surface of the core shaft base (3), and an upper cylinder (32) connected to the upper end surface of the lower cylinder (33); the lower cylinder (33) and the upper cylinder (32) are both circular and coaxially arranged, the radius of the lower cylinder (33) is greater than the radius of the upper cylinder (32), and a limiting step is formed between the upper end surface of the lower cylinder (33) and the outer side wall of the upper cylinder (32); The lower ends of the four support columns (22) are all in a step shape near the center of the core shaft base (3), and are adapted to the limiting step; The lower column (33) and the upper column (32) are used together to limit the travel of the four core shaft units (2).

4. The variable diameter tool for strengthening shot peening of a blade gear according to claim 3, characterized in that: A radially penetrating disassembly hole (44) is provided on the side wall of the base connecting shaft (4) below the four third guide rod mounting holes (42) for disassembling the base connecting shaft (4).

5. The variable diameter tool for strengthening shot peening of a blade gear according to claim 4, characterized in that: The upper end surface of the base connecting shaft (4) is provided with a base connecting shaft connecting hole (43), the middle portion of the circular connecting member is provided with a circular connecting member connecting hole (321), and the base connecting shaft (4) and the circular connecting member are detachably connected by screws passing through the circular connecting member connecting hole (321) and the base connecting shaft connecting hole (43); The lower end surface of the base connecting shaft (4) is provided with a threaded end (41) for connecting to a rotating mechanism of a strengthening shot blasting machine.

6. The variable diameter tool for strengthening shot peening of a blade gear according to claim 5, characterized in that: Each guide member (23) is provided with a longitudinal guide member connecting hole (231), and each guide slider (8) is provided with a longitudinal guide slider connecting hole (81) at a position corresponding to the guide member (23); Each guide member (23) and the corresponding guide slider (8) are detachably connected by screws passing through the guide member connection hole (231) and the guide slider connection hole (81).

7. The variable diameter tool for strengthening shot peening of a blade gear according to claim 6, characterized in that: The inner end of each guide rod (5) is a threaded end (41), and the threaded end (41) is threadedly connected to the corresponding third guide rod mounting hole (42) on the base connecting shaft (4); The outer end of each guide rod (5) is provided with a slotted nut for easy disassembly.

8. A method for strengthening and shot peening a blade gear, based on the variable diameter tool for strengthening and shot peening a blade gear according to any one of claims 1 to 7, characterized in that: The following steps are involved: Step 1: Connect the base connecting shaft (4) to the circular connecting piece of the core shaft base (3), and ensure that each first guide rod mounting hole (34) is concentric with a corresponding third guide rod mounting hole (42); Step 2: Install the four core shaft units (2) at corresponding positions of the cross slot (31), and then connect the guide member (23) on each core shaft unit (2) to a guide slider (8); Step 3: Connect the four guide rods (5) through the corresponding first guide rod mounting hole (34), the spring (6), the second guide rod mounting hole (82) on the guide slider (8), and the third guide rod mounting hole (42) on the base connecting shaft (4); Step 4: Connect the threaded end (41) of the base connecting shaft (4) to the rotating mechanism of the enhanced shot blasting machine; Step 5: The blade gear (7) to be subjected to the enhanced shot peening treatment is sleeved on the outer end surfaces of the four core shaft units (2), and then a downward pressure is continuously applied to the upper end surface of the inverted cone-shaped pressing block (1) by a pressure device until the outer end surfaces of the four core shaft units (2) just abut against the inner annular surface of the blade gear (7) to be subjected to the enhanced shot peening treatment; Step 6: The rotating mechanism of the shot peening machine starts to rotate, and drives the spindle base (3), the four spindle units (2) and the sheet gear (7) to rotate at the same angular velocity in sequence through the base connecting shaft (4). After the rotation speed stabilizes, the sheet gear (7) starts to be shot peened; Step 7: After the strengthening shot peening treatment of the sheet gear (7) is completed, the sheet gear (7) is removed to complete the strengthening shot peening treatment of the sheet gear.

9. The method for strengthening a blade gear according to claim 8, wherein: In step 1, the base connecting shaft (4) is connected to the circular connecting piece of the core shaft base (3) by screws; In step 2, the guide member (23) on each core shaft unit (2) is connected to a guide slider (8) by screws.

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