Device and method for intensifying gear through combination of pulsed electric field assisted shot blasting and ultrasonic rolling

Abstract

The invention discloses a device and method for compositely strengthening a gear through pulsed electric field assisted shot blasting and ultrasonic rolling, and relates to the technical field of gear strengthening. The device comprises a workpiece clamping system, a mechanical transmission system, an ultrasonic strengthening device, an electric pulse strengthening device and a shot peening strengthening device, one end of the ultrasonic strengthening device is connected with the mechanical transmission system, the other end of the ultrasonic strengthening device is a rack-shaped rolling head, the rack-shaped rolling head is used for being matched and meshed with a to-be-strengthened gear, and the ultrasonic strengthening device is used for rotationally carrying out ultrasonic rolling strengthening on the to-be-strengthened gear; the electric pulse strengthening device is in rotating contact with the workpiece clamping system and is used for carrying out electric pulse strengthening on the rotating to-be-strengthened gear; and the shot peening strengthening device is used for performing shot peening strengthening on the rotating gear to be strengthened. According to the device, shot peening strengthening and ultrasonic rolling strengthening assisted by a pulse current field can be provided for the to-be-strengthened gear while the to-be-strengthened gear rotates, so that the fatigue life of the gear is effectively prolonged.

Description

Technical Field

[0001] This invention relates to the field of gear strengthening technology, and in particular to a device and method for composite strengthening of gears by pulsed electric field-assisted shot peening and ultrasonic rolling. Background Technology

[0002] Gears are crucial components in mechanical products. Due to their high transmission precision and reliable performance, gear transmission systems are widely used in a wide range of industrial fields, including engineering machinery, marine vessels, and aerospace. However, gears are highly susceptible to fatigue failure under complex operating conditions such as high speed, heavy load, repeated irregular impacts, and corrosion and oxidation. During service, bending fatigue failure at the tooth root and contact fatigue failure at the tooth surface frequently occur. Premature fatigue failure restricts the improvement of gear fatigue life and thus seriously jeopardizes the service safety of equipment.

[0003] In current gear manufacturing processes, grinding is usually the final step, while shot peening is the primary strengthening process. The residual compressive stress introduced by shot peening and the increase in surface hardness can improve the fatigue life of gears. However, the deterioration of surface morphology and the increased stress concentration caused by shot peening can, to some extent, hinder further improvements in gear fatigue life.

[0004] In view of the problems of the prior art, those skilled in the art urgently need a device and method for reinforcing gears by a combination of pulsed electric field-assisted shot peening and ultrasonic rolling. Summary of the Invention

[0005] The purpose of this invention is to provide a device and method for composite strengthening of gears by pulsed electric field-assisted shot peening and ultrasonic rolling, so as to solve the problems existing in the prior art. It can provide pulsed current field-assisted shot peening and ultrasonic rolling strengthening to the gear to be strengthened while it is rotating, thereby effectively improving the fatigue life of the gear.

[0006] To achieve the above objectives, the present invention provides the following solution: This invention provides a device for composite strengthening of gears using pulsed electric field-assisted shot peening and ultrasonic rolling, comprising a workpiece clamping system, a mechanical transmission system, an ultrasonic strengthening device, an electric pulse strengthening device, and a shot peening strengthening device. The workpiece clamping system clamps the gear to be strengthened and drives it to rotate. One end of the ultrasonic strengthening device is connected to the mechanical transmission system, and the other end is a rack-shaped rolling head. The rack-shaped rolling head is adapted to mesh with the gear to be strengthened, and the mechanical transmission system can drive the ultrasonic strengthening device to feed along the length direction of the rack-shaped rolling head. The ultrasonic strengthening device is used to perform ultrasonic rolling strengthening on the rotating gear to be strengthened. The electric pulse strengthening device rotates in contact with the workpiece clamping system to perform electric pulse strengthening on the rotating gear to be strengthened. The shot peening strengthening device is used to perform shot peening strengthening on the rotating gear to be strengthened.

[0007] In some embodiments, the workpiece clamping system includes a rotating mechanism, a chuck, and a gear shaft; one end of the chuck is connected to the rotating mechanism, and the other end is provided with multiple jaws for clamping one end of the gear shaft; the gear to be strengthened is sleeved on the gear shaft, and one end of the gear shaft is insulated from the chuck; the rotating mechanism is used to drive the chuck, the gear shaft, and the gear to be strengthened to rotate.

[0008] In some embodiments, the mechanical transmission system includes a column, a first feed assembly, and a second feed assembly; the first feed assembly is connected to the column, and a sliding joint of the first feed assembly is connected to the second feed assembly to drive the second feed assembly to feed in the vertical direction; the sliding joint of the second feed assembly is connected to the ultrasonic strengthening device to drive the ultrasonic strengthening device to feed in the horizontal direction; the length direction of the rack-shaped rolling head extends in the horizontal direction.

[0009] In some embodiments, the electrical pulse enhancement device includes two bearing metal blocks; one end of each of the two bearing metal blocks is an arc-shaped groove, and the arc-shaped groove is adapted to rotate into contact with the outer wall of the other end of the gear shaft; the other ends of the two bearing metal blocks are respectively connected to the positive and negative terminals of the pulse power supply.

[0010] In some embodiments, the shot peening strengthening device includes a barrier, a shot filtration system, and a shot conveying pipe; at least a portion of the gear to be strengthened is located inside the barrier, the shot conveying pipe is used to convey shot and one end of which is connected to the shot filtration system, and the other end is disposed opposite to the portion of the gear to be strengthened that extends into the barrier for shot peening strengthening of the gear to be strengthened; the shot filtration system includes a filter device, and the filter device is connected to the interior of the barrier through a recovery pipe for recovering the filtered shot.

[0011] In some embodiments, a base is also included; the shot peening device further includes a blower, the enclosure is disposed on the base, and the base has a downwardly recessed step at a position corresponding to the enclosure, one end of the recovery pipe passes through the enclosure and corresponds to the low point of the step; the blower is disposed on the side wall of the enclosure and is used to blow shot into the recovery pipe.

[0012] In some embodiments, both the first feed assembly and the second feed assembly include a support plate, a lead screw and nut assembly, a slide rail, a slider, and a slide box; the support plate is provided with the lead screw and nut assembly and two slide rails, which are symmetrically arranged on both sides of the lead screw and nut assembly and are parallel to the lead screw and nut assembly; the two sliders are slidably connected to the corresponding slide rails, and the slide box is the sliding pair and is fixedly connected to the two sliders and the nut of the lead screw and nut assembly, and the lead screw and nut assembly is used to drive the slide box to move.

[0013] In some embodiments, reinforcing ribs are also included; the ultrasonic strengthening device includes an ultrasonic impact head, the middle part of the rack-shaped rolling head is connected to the ultrasonic impact head, and the rack-shaped rolling head and the ultrasonic impact head are connected by the reinforcing ribs to form a triangular support structure; the rack-shaped rolling head is made of insulating material.

[0014] In some embodiments, at least two gears to be strengthened are mounted on the gear shaft in a vertical direction, and the first feed assembly drives the rack-shaped rolling head to feed in a vertical direction so that the rack-shaped rolling head can mesh with any of the gears to be strengthened; one end of the gear shaft is an insulating part, and the plurality of jaws of the chuck are used to clamp the insulating part; the rotating mechanism is an indexing head.

[0015] This invention also provides a method for strengthening gears using a combination of pulsed electric field-assisted shot peening and ultrasonic rolling. Based on the aforementioned apparatus for strengthening gears using a combination of pulsed electric field-assisted shot peening and ultrasonic rolling, the method includes the following steps: mounting the gear to be strengthened on a workpiece clamping system; controlling a mechanical transmission system to drive an ultrasonic strengthening device to feed so that a rack-shaped rolling head meshes with the gear to be strengthened; controlling the workpiece clamping system to drive the gear to be strengthened to rotate, and controlling the mechanical transmission system to drive the ultrasonic strengthening device to feed along the length direction of the rack-shaped rolling head; performing shot peening on the rotating gear to be strengthened using the shot peening device; and / or performing ultrasonic rolling on the rotating gear to be strengthened using the ultrasonic strengthening device; and during the shot peening and / or ultrasonic rolling process, selectively using an electric pulse strengthening device to perform electric pulse strengthening on the rotating gear to be strengthened.

[0016] The present invention achieves the following technical effects compared to the prior art: The present invention relates to a device and method for composite strengthening of gears using pulsed electric field-assisted shot peening and ultrasonic rolling. The rack-shaped rolling head of the ultrasonic strengthening device meshes with the gear to be strengthened. When the workpiece clamping system drives the gear to be strengthened to rotate, the mechanical transmission system drives the ultrasonic strengthening device to feed along the length of the rack-shaped rolling head at a certain speed. At this time, the ultrasonic strengthening device can perform ultrasonic rolling strengthening on the gear to be strengthened, and the electric pulse strengthening device can perform electric pulse strengthening by applying a pulsed current to the rotating gear to be strengthened. The shot peening device can also perform shot peening strengthening on the rotating gear. Therefore, the present invention can provide pulsed current field-assisted shot peening and ultrasonic rolling strengthening to the gear while it rotates, effectively improving the surface roughness of the gear, introducing high-amplitude, deep residual compressive stress, and increasing the surface hardness of the gear, thereby effectively improving the fatigue life of the gear. Attached Figure Description

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

[0018] Figure 1 This is a schematic diagram of the device for reinforcing gears by a combination of pulsed electric field-assisted shot peening and ultrasonic rolling in some embodiments of the present invention. Figure 2 This is a schematic diagram of the device for reinforcing gears with pulsed electric field-assisted shot peening and ultrasonic rolling in some embodiments of the present invention, with the enclosure removed. Figure 3 This is a top view showing the connection between the ultrasonic strengthening device, the electrical pulse strengthening device, and the gear to be strengthened in some embodiments of the present invention; Figure 4 This is a schematic diagram showing the connection between the mechanical transmission system, the ultrasonic strengthening device, and the gear to be strengthened in some embodiments of the present invention; Figure 5 This is a schematic diagram of the structure of the first feed assembly in some embodiments of the present invention; Figure 6 This is a schematic diagram showing the connection between the electric pulse strengthening device and the workpiece clamping system in some embodiments of the present invention; Figure 7 This is a schematic diagram showing the connection between the rack-shaped rolling head, the ultrasonic impact head, and the reinforcing rib in some embodiments of the present invention; Figure 8 This is a flowchart illustrating the main steps of a method for reinforcing gears using a combination of pulsed electric field-assisted shot peening and ultrasonic rolling, as described in some embodiments of the present invention.

[0019] In the diagram: 1-Workpiece clamping system; 2-Mechanical transmission system; 3-Ultrasonic strengthening device; 4-Electrical pulse strengthening device; 5-Shot peening strengthening device; 6-Gear to be strengthened; 7-Base; 11-Rotating mechanism; 12-Chuck; 13-Gear shaft; 21-Column; 22-First feed assembly; 23-Second feed assembly; 24-Bearing plate; 25-Screw and nut assembly; 26-Slide rail; 27-Slider; 28-Slide box; 29-Drive motor; 31-Rack and pinion rolling head; 32-Ultrasonic impact head; 33-Reinforcing rib; 41-Bearing metal block; 51-Blocking; 52-Shot filtration system; 53-Shot conveying pipe; 54-Recovery pipe; 55-Fan; 56-Filtration device; 71-Step; 121-Claw; 131-Insulation part. Detailed Implementation

[0020] 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. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] The purpose of this invention is to provide a device and method for composite strengthening of gears by pulsed electric field-assisted shot peening and ultrasonic rolling, so as to solve the problems existing in the prior art. It can provide pulsed current field-assisted shot peening and ultrasonic rolling strengthening to the gear to be strengthened while it is rotating, thereby effectively improving the fatigue life of the gear.

[0022] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0023] This invention provides a device for reinforcing gears using a combination of pulsed electric field-assisted shot peening and ultrasonic rolling, such as... Figures 1 to 7 As shown, it includes a workpiece clamping system 1, a mechanical transmission system 2, an ultrasonic strengthening device 3, an electrical pulse strengthening device 4, and a shot peening strengthening device 5; wherein, the workpiece clamping system 1 is disposed on the base 7 for clamping the gear 6 to be strengthened and can drive the gear 6 to be strengthened to rotate.

[0024] One end of the ultrasonic strengthening device 3 is connected to the mechanical transmission system 2, and the other end is a rack-shaped rolling head 31, which is used to mesh with the gear 6 to be strengthened. The mechanical transmission system 2 can drive the ultrasonic strengthening device 3 to feed along the length direction of the rack-shaped rolling head 31, and the feeding speed is matched with the rotation speed of the gear 6 to be strengthened, so that the rack-shaped rolling head 31 and the gear 6 to be strengthened always remain meshed. The ultrasonic strengthening device 3 is used to perform ultrasonic rolling strengthening on the rotating gear 6 to be strengthened.

[0025] The electric pulse strengthening device 4 is in contact with the workpiece clamping system 1 and the two can rotate relative to each other to perform electric pulse strengthening on the rotating gear 6 to be strengthened; the shot peening strengthening device 5 is used to perform shot peening strengthening on the rotating gear 6 to be strengthened.

[0026] In some embodiments, such as Figure 6 As shown, the workpiece clamping system 1 includes a rotating mechanism 11, a chuck 12, and a gear shaft 13. The rotating mechanism 11 is mounted on the base 7. One end of the chuck 12 is connected to the rotating mechanism 11, and the other end is provided with multiple jaws 121 for clamping one end of the gear shaft 13. A gear 6 to be strengthened is fitted onto the gear shaft 13. One end of the gear shaft 13 is insulated from the chuck 12. The rotating mechanism 11 drives the chuck 12, the gear shaft 13, and the gear 6 to be strengthened to rotate together. It should be noted that those skilled in the art can specifically set the number of gears 6 to be strengthened fitted onto the gear shaft 13.

[0027] In some embodiments, such as Figure 4 As shown, the mechanical transmission system 2 includes a column 21, a first feed assembly 22, and a second feed assembly 23. The column 21 is mounted on the base 7. The first feed assembly 22 is connected to the column 21 in a vertical direction, and the sliding joint of the first feed assembly 22 is connected to the second feed assembly 23 to drive the second feed assembly 23 to feed in a vertical direction. The sliding joint of the second feed assembly 23 is connected to the ultrasonic strengthening device 3 to drive the ultrasonic strengthening device 3 to feed in a horizontal direction. The length of the rack-shaped rolling head 31 extends in a horizontal direction. That is, the present invention can drive the rack-shaped rolling head 31 to feed in a vertical direction through the first feed assembly 22, and can drive the rack-shaped rolling head 31 to feed in a horizontal direction through the second feed assembly 23.

[0028] In some embodiments, such as Figure 6 As shown, the electric pulse enhancement device 4 includes two bearing metal blocks 41; one end of each bearing metal block 41 is an arc-shaped groove that is adapted to and in contact with the other end of the gear shaft 13 and the two can rotate relative to each other; the other ends of the two bearing metal blocks 41 are respectively connected to the positive and negative terminals of the pulse power supply.

[0029] It should be noted that the two bearing metal blocks 41 of the present invention provide pulse current to the gear shaft 13 and the gear 6 to be strengthened on it for auxiliary strengthening; and the pulse circuit connected to the two bearing metal blocks 41 is omitted in the accompanying drawings of the present invention. Those skilled in the art can set the pulse circuit according to the actual situation. The present invention does not make specific limitations on this, as long as the effect of providing pulse current to the gear 6 to be strengthened through the pulse circuit and the two bearing metal blocks 41 can be achieved.

[0030] In some embodiments, such as Figure 1and Figure 2 As shown, the shot peening strengthening device 5 includes a barrier 51, a shot filtration system 52, and a shot conveying pipe 53. At least a portion of the gear 6 to be strengthened is located inside the barrier 51. The shot conveying pipe 53 is used to convey shot, and one end of it is connected to the shot filtration system 52, while the other end is positioned opposite to the portion of the gear 6 to be strengthened that extends into the barrier 51 for shot peening strengthening of the gear 6. The shot filtration system includes a filter device 56, and the filter device 56 is connected to the interior of the barrier 51 through a recovery pipe 54 for recovering the filtered shot.

[0031] In some embodiments, see further reference. Figure 1 and Figure 2 As shown, the shot peening strengthening device 5 also includes a blower 55, a barrier 51 is disposed on a base 7, and a downwardly recessed step 71 is provided on the base 7 at a position corresponding to the barrier 51. One end of the recovery pipe 54 passes through the barrier 51 and corresponds to the low point of the step 71. The blower 55 is disposed on the side wall of the barrier 51 and is used to blow shot into the recovery pipe 54.

[0032] It should be noted that the step 71 of the present invention is inclined, the fan 55 is located on one side of the enclosure 51, one end of the recycling pipe 54 passes through the other side of the enclosure 51, and the recycling pipe 54 corresponds to the low point of the inclined step 71. The shot is blown to one side by the fan 55 and then enters the recycling pipe 54. The rear end of the pipe is connected to a filter device 56, which is used to filter the used shot, dust, metal shavings, etc. and return them to the shot peening strengthening device, so that the shot can be recycled multiple times.

[0033] In some embodiments, such as Figure 5 As shown, the first feed assembly 22 and the second feed assembly 23 have similar structures and both include a support plate 24, a lead screw and nut assembly 25, a slide rail 26, a slider 27, and a slide box 28. The support plate 24 is provided with the lead screw and nut assembly 25 and two slide rails 26, which are symmetrically arranged on both sides of the lead screw and nut assembly 25 and are parallel to the lead screw and nut assembly 25. The two sliders 27 are slidably connected to the corresponding slide rails 26. The slide box 28 is a sliding pair and is fixedly connected to the two sliders 27 and the nut of the lead screw and nut assembly 25. The lead screw and nut assembly 25 is used to drive the slide box 28 to move.

[0034] Furthermore, the lead screw and nut assembly 25 includes a lead screw and a nut. The nut is sleeved on the lead screw, and one end of the lead screw is connected to the drive motor 29 for transmission. Thus, the drive motor 29 drives the lead screw to rotate and drives the nut to move along the length of the lead screw. The nut is connected and fixed to the slide box 28.

[0035] In some embodiments, such as Figure 7As shown, it also includes reinforcing ribs 33; the ultrasonic strengthening device 3 includes an ultrasonic impact head 32, the middle part of the rack-shaped rolling head 31 is connected to the ultrasonic impact head 32, and the rack-shaped rolling head 31 and the ultrasonic impact head 32 are connected by reinforcing ribs 33 to form a triangular support structure. Figure 7 In the process, the two sides of the ultrasonic impact head 32 are connected to the rack-shaped rolling head 31 by reinforcing ribs 33 to form a stable triangular support to improve the rigidity of the rack-shaped rolling head 31.

[0036] In some embodiments, the rack-and-pinion rolling head 31 is made of an insulating material.

[0037] The rack-shaped rolling head 31 of the present invention can be made of materials such as SiC with good insulation properties to prevent pulse current from affecting the ultrasonic rolling device; obviously, the rack-shaped rolling head 31 can also be made of other insulating materials, and the present invention does not specifically limit it.

[0038] In some embodiments, at least two gears 6 to be strengthened are sleeved on the gear shaft 13 in the vertical direction, and the first feed assembly 22 drives the rack-shaped rolling head 31 to feed in the vertical direction so that the rack-shaped rolling head 31 can mesh with any of the gears 6 to be strengthened.

[0039] One end of the gear shaft 13 is an insulating part 131, and the multiple jaws 121 of the chuck 12 are used to clamp the insulating part 131. By setting the insulating part 131, the present invention ensures that the pulse current only passes through the gear shaft 13 and the gear 6 to be strengthened, thus preventing the machine tool from being affected by the pulse current.

[0040] In some embodiments, the rotating mechanism 11 is an indexing head.

[0041] The device for pulsed electric field assisted shot peening and ultrasonic rolling composite gear strengthening of the present invention has a column 21 located on one side of the upper surface of the base 7, which is used to support the cantilever beam and the mechanical transmission system 2.

[0042] The mechanical transmission system 2 is used to ensure the feeding motion of the ultrasonic strengthening device 3 in both vertical and horizontal directions. The feeding motion in the vertical direction is used to enable the ultrasonic strengthening device 3 to switch between different gears 6 to be strengthened for meshing, and the feeding motion in the horizontal direction is used to enable the ultrasonic strengthening device 3 to continuously strengthen along with the rotating gears.

[0043] The indexing head of the workpiece clamping system 1 is located on the base 7, which can ensure that the gear 6 to be strengthened can be rotated by indexing or continuously, thereby meeting the different gear strengthening process requirements; the gear shaft 13 is clamped on the chuck 12, and two or more gears 6 to be strengthened can be clamped on the gear shaft 13; the gear shaft 13 and the chuck 12 are insulated from each other.

[0044] The ultrasonic strengthening device 3 is located at the front end of the slide box 28. The rolling cutter at the front end of the ultrasonic rolling is a rack that meshes with the gear 6 to be strengthened. The rack is made of materials with good insulation properties, such as SiC, to prevent the pulse current from affecting the ultrasonic rolling device. As the gear 6 to be strengthened rotates, the ultrasonic rolling device feeds at a certain speed in the horizontal direction. The number of teeth on the rack corresponds to the number of teeth on the gear. After the gear rotates one revolution, the rack also completes one cycle of feeding. Then, the ultrasonic rolling strengthening of the next gear is performed by zeroing through the mechanical transmission system.

[0045] The two bearing metal blocks 41 of the electric pulse strengthening device 4 are engaged with the gear shaft 13, and their two ends are respectively connected to the positive and negative terminals of the pulse power supply to provide pulse current to the gear 6 to be strengthened.

[0046] The shot peening device 5 is located on one side of the base 7, placed on the ground, with a shot delivery pipe 53 extending from it. It is aimed at the corresponding position of the gear 6 to be strengthened for shot peening. The base 7 is equipped with a barrier 51, ensuring that only the gear 6 to be strengthened is exposed to the shot peening environment, thus preventing shot splatter from affecting other devices. A shot recovery system is used to recover and filter the shot, allowing it to be recycled multiple times.

[0047] This invention also provides a method for strengthening gears using a combination of pulsed electric field-assisted shot peening and ultrasonic rolling, such as... Figure 8 As shown, it includes the following steps: Step S1: Install the gear 6 to be strengthened onto the workpiece clamping system 1; Step S2: Control the mechanical transmission system 2 to drive the ultrasonic strengthening device 3 to feed so that the rack-shaped rolling head 31 meshes with the gear 6 to be strengthened; Step S3: Control the workpiece clamping system 1 to drive the gear 6 to be strengthened to rotate, and control the mechanical transmission system 2 to drive the ultrasonic strengthening device 3 to feed along the length direction of the rack-shaped rolling head 31; Step S4: Use the shot peening strengthening device 5 to perform shot peening strengthening on the rotating gear 6 to be strengthened; and / or use the ultrasonic strengthening device 3 to perform ultrasonic rolling strengthening on the rotating gear 6 to be strengthened; and during the shot peening strengthening and / or ultrasonic rolling strengthening process, selectively use the electric pulse strengthening device 4 to perform electric pulse strengthening on the rotating gear 6 to be strengthened.

[0048] Based on the above step S3, it should be noted that the present invention can perform shot peening on the gear 6 to be strengthened. During this process, the electric pulse strengthening device 4 can be kept on or selectively turned on to assist with the pulse current field. The present invention can also perform ultrasonic rolling strengthening on the gear 6 to be strengthened. During this process, the electric pulse strengthening device 4 can be kept on or selectively turned on to assist with the pulse current field. The present invention can also first perform shot peening on the gear 6 to be strengthened, and then perform ultrasonic rolling strengthening on the gear 6 to be strengthened. Since there may be craters on the surface of the gear 6 to be strengthened after shot peening, the subsequent ultrasonic rolling strengthening can make the surface of the gear to be strengthened smooth. During this process, the electric pulse strengthening device 4 can be kept on or selectively turned on to assist with the pulse current field.

[0049] This invention provides a device and method for composite strengthening of gears by pulsed electric field-assisted shot peening and ultrasonic rolling, which relates to gear surface modification and strengthening. It can provide pulsed current field-assisted shot peening and ultrasonic rolling strengthening to the gear while it is rotating, which can effectively improve the surface roughness of the gear, introduce high amplitude and deep residual compressive stress, improve the surface hardness of the gear, and thus effectively improve the fatigue life of the gear.

[0050] The working principle of the mechanical transmission system 2 of this invention is as follows: The mechanical transmission system 2 is divided into a vertical transmission system and a horizontal transmission system. The slide box 28 of the first feed assembly 22 moves vertically up and down, and a second feed assembly 23 in the horizontal direction is installed on the slide box 28. The second feed assembly 23 in the horizontal direction is similar to the first feed assembly 22 in the vertical direction, but an ultrasonic strengthening device 3 is installed on the slide box 28 of the second feed assembly 23 in the horizontal direction. The front end of the ultrasonic strengthening device 3 is a rack-shaped ultrasonic rolling head. When ultrasonic strengthening begins, the mechanical transmission system 2 is activated, so that the rack-shaped ultrasonic rolling head meshes with the gear 6 to be strengthened. Subsequently, the gear rotates, and the second feed assembly 23 in the horizontal direction begins to feed. When it is necessary to switch the gear 6 to be strengthened, the first feed assembly 22 in the vertical direction begins to move. Furthermore, the transmission systems in the two directions are linked, which can complete all the feeding movements required for ultrasonic strengthening.

[0051] The working principle of the ultrasonic strengthening device 3 of this invention is as follows: The ultrasonic strengthening device 3 is located on the slide box 28 at the front end of the mechanical transmission system 2. The ultrasonic rolling cutter at the front end of the ultrasonic rolling device is a rack that meshes well with the gear to be strengthened. The number of teeth on the rack is consistent with that of the gear to be strengthened, and the rack has good rigidity. During ultrasonic rolling strengthening, process parameters such as feed speed, rolling force, ultrasonic amplitude, and ultrasonic frequency can be adjusted according to the strengthening requirements. During ultrasonic rolling strengthening, the feed can start from the beginning of the rack, and as the gear rotates, continuous ultrasonic rolling strengthening of a complete revolution of the gear can be completed until the end of the rack; alternatively, strengthening can start from the middle of the rack, and after using several teeth to complete the strengthening, it can start again. Two or more gears 6 to be strengthened are clamped on the gear fixture. After one gear has completed ultrasonic rolling strengthening, the ultrasonic strengthening device can move to the next gear 6 to be strengthened under the action of the feed system, which can improve the strengthening efficiency of the gear.

[0052] The working principle of the electric pulse strengthening device 4 of the present invention is as follows: The electric pulse strengthening device 4 consists of two bearing metal blocks 41 and a bracket. The two metal blocks are respectively connected to the positive and negative terminals of the pulse power supply. The bearing metal blocks 41 cooperate with the gear shaft 13 to conduct the pulse current to the gear 6 to be strengthened. The workpiece clamping system 1 and the gear shaft 13 are equipped with insulation devices to protect the machine tool body from damage by the pulse current.

[0053] The working principle of the shot peening strengthening device 5 of this invention is as follows: The shot peening strengthening device 5 is located on one side of the base 7, placed on the ground, with a shot conveying pipe extending from it. The pipe can be moved to align with the area to be strengthened on the gear. By changing the shot peening strengthening process parameters such as shot peening speed, shot peening angle, shot peening coverage, and shot diameter, different shot peening strengthening effects can be achieved. A baffle is provided on the shot peening side of the machine tool to prevent shot splatter from affecting the operator and other parts of the machine tool. A downward-sloping step is provided on the machine tool base 7, and a fan 55 is provided on one side of the step to blow used shot, metal shavings, dust, etc., into the recovery pipe 54 to prevent harm to the operator. The recovery pipe 54 is connected to a filter device 56, and the filtered shot can be reused multiple times.

[0054] The working principle of the composite strengthening system of this invention is as follows: The composite strengthening system includes an ultrasonic strengthening device 3, an electrical pulse strengthening device 4, and a shot peening strengthening device 5. During the strengthening process, the system has the following strengthening modes: single ultrasonic rolling strengthening, single shot peening strengthening, ultrasonic rolling strengthening assisted by a pulsed current field, shot peening strengthening assisted by a pulsed current field, and shot peening combined with continuous ultrasonic rolling strengthening assisted by a pulsed current field. Different strengthening modes of this system can be selected according to the different strengthening requirements of the gear to be strengthened.

[0055] Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this invention. Furthermore, those skilled in the art will recognize that, based on the ideas of this invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this invention.

Claims

1. A device for reinforcing gears using a combination of pulsed electric field-assisted shot peening and ultrasonic rolling, characterized in that, This includes workpiece clamping systems, mechanical transmission systems, ultrasonic strengthening devices, electrical pulse strengthening devices, and shot peening strengthening devices; The workpiece clamping system is used to clamp the gear to be strengthened and drive the gear to be strengthened to rotate. One end of the ultrasonic strengthening device is connected to the mechanical transmission system, and the other end is a rack-shaped rolling head. The rack-shaped rolling head is used to mesh with the gear to be strengthened, and the mechanical transmission system can drive the ultrasonic strengthening device to feed along the length direction of the rack-shaped rolling head. The ultrasonic strengthening device is used to perform ultrasonic rolling strengthening on the rotating gear to be strengthened. The electrical pulse strengthening device makes rotatable contact with the workpiece clamping system to perform electrical pulse strengthening on the rotating gear to be strengthened. The shot peening device is used to perform shot peening on the rotating gear to be strengthened.

2. The device for composite strengthening of gears by pulsed electric field assisted shot peening and ultrasonic rolling according to claim 1, characterized in that, The workpiece clamping system includes a rotating mechanism, a chuck, and a gear shaft; One end of the chuck is connected to the rotating mechanism, and the other end is provided with multiple jaws for clamping one end of the gear shaft; the gear to be strengthened is sleeved on the gear shaft, and one end of the gear shaft is insulated from the chuck. The rotating mechanism is used to drive the chuck, the gear shaft and the gear to be strengthened to rotate.

3. The device for composite strengthening of gears by pulsed electric field-assisted shot peening and ultrasonic rolling according to claim 2, characterized in that, The mechanical transmission system includes a column, a first feed assembly, and a second feed assembly; The first feed assembly is connected to the column, and the sliding joint of the first feed assembly is connected to the second feed assembly to drive the second feed assembly to feed in the vertical direction; the sliding joint of the second feed assembly is connected to the ultrasonic strengthening device to drive the ultrasonic strengthening device to feed in the horizontal direction; the length direction of the rack-shaped rolling head extends in the horizontal direction.

4. The device for composite strengthening of gears by pulsed electric field assisted shot peening and ultrasonic rolling according to claim 2, characterized in that, The electrical pulse enhancement device includes two bearing metal blocks; One end of each of the two bearing metal blocks is an arc-shaped groove, and the arc-shaped groove is adapted to rotate and contact the outer wall of the other end of the gear shaft; The other ends of the two bearing metal blocks are respectively connected to the positive and negative terminals of the pulse power supply.

5. The device for composite strengthening of gears by pulsed electric field assisted shot peening and ultrasonic rolling according to claim 1, characterized in that, The shot peening enhancement device includes a barrier, a shot filtration system, and a shot conveying pipeline; At least a portion of the gear to be strengthened is located inside the enclosure. The shot conveying pipe is used to convey shot and one end of it is connected to the shot filtration system. The other end is arranged opposite to the portion of the gear to be strengthened that extends into the enclosure for shot peening strengthening of the gear to be strengthened. The pellet filtration system includes a filtration device, and the filtration device is connected to the interior of the enclosure via a recycling pipe for recycling the filtered pellets.

6. The device for composite strengthening of gears by pulsed electric field assisted shot peening and ultrasonic rolling according to claim 5, characterized in that, It also includes a base; The shot peening strengthening device also includes a fan, the enclosure is set on the base, and the base is provided with a downwardly recessed step at a position corresponding to the enclosure, and one end of the recovery pipe passes through the enclosure and corresponds to the low point of the step; The blower is installed on the side wall of the enclosure and is used to blow pellets into the recycling pipe.

7. The device for composite strengthening of gears by pulsed electric field assisted shot peening and ultrasonic rolling according to claim 3, characterized in that, Both the first feed assembly and the second feed assembly include a support plate, a lead screw and nut assembly, a slide rail, a slider, and a slide box; The bearing plate is provided with the lead screw and nut assembly and two slide rails. The two slide rails are symmetrically arranged on both sides of the lead screw and nut assembly, and the two slide rails are arranged parallel to the lead screw and nut assembly. The two sliders are slidably connected to the corresponding slide rails, the slide box is the sliding pair and is fixedly connected to the nuts of the two sliders and the lead screw and nut assembly, and the lead screw and nut assembly is used to drive the slide box to move.

8. The device for composite strengthening of gears by pulsed electric field assisted shot peening and ultrasonic rolling according to claim 1, characterized in that, It also includes reinforcing ribs; the ultrasonic strengthening device includes an ultrasonic impact head, the middle part of the rack-shaped rolling head is connected to the ultrasonic impact head, and the rack-shaped rolling head and the ultrasonic impact head are connected by the reinforcing ribs to form a triangular support structure; The rack-shaped rolling head is made of insulating material.

9. The device for composite strengthening of gears by pulsed electric field assisted shot peening and ultrasonic rolling according to claim 3, characterized in that, At least two gears to be strengthened are sleeved on the gear shaft in the vertical direction. The first feeding component drives the rack-shaped rolling head to feed in the vertical direction so that the rack-shaped rolling head can mesh with any of the gears to be strengthened. One end of the gear shaft is an insulating part, and the plurality of jaws of the chuck are used to clamp the insulating part; the rotating mechanism is an indexing head.

10. A method for reinforcing gears using a combination of pulsed electric field-assisted shot peening and ultrasonic rolling, characterized in that... The apparatus for reinforcing gears based on the pulsed electric field assisted shot peening and ultrasonic rolling composite reinforcement according to any one of claims 1-9 includes the following steps: Install the gear to be strengthened into the workpiece clamping system; The mechanical transmission system is controlled to drive the ultrasonic strengthening device to feed, causing the rack-shaped rolling head to mesh with the gear to be strengthened; The workpiece clamping system is controlled to rotate the gear to be strengthened, and the mechanical transmission system is controlled to feed the ultrasonic strengthening device along the length of the rack-shaped rolling head. The rotating gear to be strengthened is subjected to shot peening using a shot peening device; and / or the rotating gear to be strengthened is subjected to ultrasonic rolling using an ultrasonic strengthening device; and during the shot peening and / or ultrasonic rolling process, the rotating gear to be strengthened is selectively subjected to electrical pulse strengthening using an electrical pulse strengthening device.

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