A mechanical supercharged impact strengthening device and method for laser additive manufacturing

Abstract

The present invention provides a mechanical supercharged impact strengthening device for laser additive manufacturing, comprising: a housing; a driving mechanism disposed inside the housing; a screw compression rod penetrating the housing and disposed adjacent to the driving mechanism and connected to the housing; a lifting gear sleeve disposed outside the screw compression rod; a first bearing sleeve disposed outside the lifting gear and connected to the lifting gear; a spring disposed below the screw compression rod and capable of contacting the screw compression rod, thereby providing a force to the screw compression rod in the direction of restoring elastic deformation of the spring; an ultrasonic impact device housing disposed below the housing; a slot disposed on the side wall of the ultrasonic impact device housing; and a self-locking mechanism disposed inside the slot and connected to the screw compression rod. The present invention drives the lifting gear by providing a driving mechanism, thereby driving the screw compression rod to move, thereby achieving compression or relaxation of the compression spring, and combined with the self-locking mechanism, ensures the stability of the output impact load.

Description

Technical Field

[0001] The present invention belongs to the technical field of post-processing strengthening of metal laser additive manufacturing, and in particular relates to a mechanical supercharged impact strengthening device and method for laser additive manufacturing. Background Art

[0002] Laser additive manufacturing (LAM) utilizes a high-energy laser beam to melt metal powder or wire, depositing the cladding material layer by layer along a filling path to create complex metal components. Due to its flexible manufacturing capabilities, LAM enables rapid conversion of parts produced in a variety of styles and batch sizes. This technology can be used for the rapid manufacture of three-dimensional solid metal parts subject to significant mechanical loads.

[0003] Due to the rapid condensation characteristics of laser additive manufacturing, the instantaneous local input of high energy by the laser beam causes uneven temperature distribution in the surface area of the target component. During cooling and solidification, different parts of the object transfer heat differently, and thus different parts of the target component restrict each other, causing local thermoplastic deformation, and thus forming large internal stresses in the molded parts of the target component. Currently, the use of ultrasonic impact strengthening technology can effectively reduce the large internal stresses formed in laser additive manufacturing molded parts through the high-frequency vibration of the impact head. However, in the existing impact strengthening device, the general hydraulic cylinder controls the impact force device. During the process of controlling the impact force through the hydraulic cylinder, pressure changes will occur inside the hydraulic cylinder, resulting in impact force fluctuations. The generation of fluctuations will cause the device to produce large impact dents on the surface of the workpiece due to its own weight, causing damage to the workpiece.

[0004] To this end, in order to address the above-mentioned technical problems, it is necessary to provide a mechanical supercharged impact strengthening device and method for laser additive manufacturing. Summary of the Invention

[0005] The purpose of the present invention is to provide a mechanical supercharged impact strengthening device and method for laser additive manufacturing, so as to solve the technical problem in the prior art that pressure changes will occur inside the hydraulic cylinder, which will lead to impact force fluctuations. The generation of fluctuations will cause the device to produce large impact dents on the surface of the workpiece due to its own weight, resulting in damage to the workpiece.

[0006] The first aspect of the present invention provides a mechanical supercharged impact strengthening device for laser additive manufacturing, comprising: a shell; a driving mechanism, arranged inside the shell and connected to the shell; a screw compression rod, which passes through the shell, is arranged adjacent to the driving mechanism, and is connected to the shell; a lifting gear, arranged inside the shell, sleeved on the outside of the screw compression rod, and connected to the driving mechanism; a first bearing, sleeved on the outside of the lifting gear, and connected to the lifting gear; a spring, arranged below the screw compression rod, and capable of contacting the screw compression rod, thereby providing a force to the screw compression rod along the direction of the spring restoring elastic deformation; an ultrasonic impact device shell, arranged below the shell and connected to the shell; a card slot, arranged on the side wall of the ultrasonic impact device shell; a self-locking mechanism, arranged inside the card slot, and connected to the screw compression rod, so that when the spring drives the screw compression rod, the self-locking mechanism is clamped in the card slot.

[0007] Optionally, the driving mechanism includes: a speed regulating motor, which is arranged above the outer shell and connected to the outer shell; a transmission shaft, which is arranged inside the outer shell and below the speed regulating motor, and connected to the output shaft of the speed regulating motor; a gear, which is sleeved on the outer side of the transmission shaft and meshes with the lifting gear; a second bearing, which is arranged on the upper and lower sides of the transmission shaft and connected to the transmission shaft.

[0008] Optionally, the ultrasonic impact control console is arranged outside the shell and is electrically connected to the speed regulating motor.

[0009] Optionally, the external fixing frame is arranged in the middle of the ultrasonic impact device housing and is connected to the ultrasonic impact device housing.

[0010] Optionally, the impact module is disposed below the housing of the ultrasonic impact device and is connected to the housing of the ultrasonic impact device.

[0011] Optionally, the end cover is arranged on the upper part of the shell and connected to the shell; the bolt is passed through the top end of the end cover to connect the end cover to the shell.

[0012] The second aspect of the present invention provides a control method for a mechanical supercharged impact strengthening device for laser additive manufacturing. The specific steps of the control method include: S1: setting the impact program for the ultrasonic impact console according to the residual stress distribution characteristics of the target component; S2: according to the set impact program, the ultrasonic impact console controls the driving mechanism, thereby driving the lifting gear to move, so that the lifting gear drives the screw compression rod to compress the spring to a preset load value; S3: the self-locking mechanism fixes the screw compression rod, so that the screw compression rod maintains a stable load output according to the preset load value, so that the impact force applied by the impact module to the target component is stable and controllable, thereby achieving uniform regional stress distribution of the target component.

[0013] Optionally, in step S1, the impact program set includes: selecting a large impact load to perform ultrasonic impact strengthening treatment on the target component at a location where the residual stress of the target component is concentrated more; selecting a small impact load to treat the target component at a location where the residual stress of the target component is concentrated less.

[0014] Compared with the prior art, the present invention provides a mechanical supercharged impact strengthening device and method for laser additive manufacturing, which controls the ultrasonic impact console through a control method, and then controls the driving mechanism to drive the lifting gear to move, and then the lifting gear drives the lead screw compression rod to move, so that the lead screw compression rod compresses the spring, and the lead screw compression rod is subjected to the upward reaction force of the spring, and then when the spring drives the lead screw compression rod, the self-locking mechanism is clamped in the slot, making it difficult for the self-locking mechanism to slip out of the slot, so that the impact force applied by the impact module to the target component is stable and controllable, thereby ensuring the stability of the impact load, making the regional stress distribution of the target component uniform, effectively avoiding impact force fluctuations, and ensuring the processing quality of the workpiece. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The above and other objects, features and advantages of the exemplary embodiments of the present invention will become readily understood by reading the detailed description below with reference to the accompanying drawings. In the accompanying drawings, several embodiments of the present invention are shown in an exemplary and non-limiting manner, and the same or corresponding reference numerals represent the same or corresponding parts, wherein:

[0016] Figure 1 Schematic diagram of the structure of the mechanical supercharged impact strengthening device for laser additive manufacturing of the present invention;

[0017] Figure 2 Schematic diagram of the structure of the impact load adjustment portion of the mechanical supercharged impact strengthening device for laser additive manufacturing of the present invention;

[0018] Figure 3 It is a structural schematic diagram of the lifting gear and the screw compression rod of the present invention.

[0019] Description of Figure Numbers:

[0020] 1. Ultrasonic impact control console; 2. Impact load adjustment mechanism; 201. Speed regulating motor; 202. Drive shaft; 203. Gear; 204. Second bearing; 205. First bearing; 206. Lifting gear; 207. Screw compression rod; 208. Spring; 3. End cover; 4. Bolt; 5. Housing; 6. Self-locking mechanism; 7. External fixing bracket; 8. Ultrasonic impact device housing; 9. Impact module. DETAILED DESCRIPTION

[0021] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art. Unless otherwise specified, the technical means used in the examples are conventional means well known to those skilled in the art.

[0022] It should be noted that, unless otherwise specified, technical or scientific terms used herein should have the ordinary meanings understood by those skilled in the art to which the present invention pertains. In this document, relational terms such as "first" and "second" are used solely to distinguish one entity or operation from another, and do not necessarily require or imply any actual relationship or order between these entities or operations. Terms such as "connected" and "connected" should be interpreted broadly, meaning, for example, fixedly connected, removably connected, or integrally connected; mechanically connected, electrically connected; directly connected, or indirectly connected through an intermediary. The terms "comprise," "include," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or apparatus comprising a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus. Without further limitation, the phrase "comprises..." does not preclude the presence of additional identical elements in the process, method, article, or apparatus comprising the elements.

[0023] like Figure 1 、 Figure 2 and Figure 3As shown, the first aspect of this embodiment provides a mechanical supercharged impact strengthening device for laser additive manufacturing, including: a housing 5; a driving mechanism, which is arranged inside the housing 5 and connected to the housing 5; a screw compression rod 207, which passes through the housing 5, is arranged adjacent to the driving mechanism, and is connected to the housing 5; a lifting gear 206, which is arranged inside the housing 5, is sleeved on the outside of the screw compression rod 207, and is connected to the driving mechanism; a first bearing 205, which is sleeved on the outside of the lifting gear 206 and is connected to the lifting gear 206; a spring 208 is arranged below the screw compression rod 207 and can contact the screw compression rod 207, thereby providing a force to the screw compression rod 207 along the direction of restoring the elastic deformation of the spring 208; the ultrasonic impact device shell 8 is arranged below the outer shell 5 and is connected to the outer shell 5; the card slot is arranged on the side wall of the ultrasonic impact device shell 8; the self-locking mechanism 6 is arranged inside the card slot and is connected to the screw compression rod 207, and then when the spring 208 drives the screw compression rod 207, the self-locking mechanism 6 is clamped in the card slot.

[0024] The mechanical supercharged impact strengthening device for laser additive manufacturing of this embodiment includes a housing 5, a driving mechanism, a screw compression rod 207, a lifting gear 206, a first bearing 205, a spring 208, an ultrasonic impact device housing 8, a clamping slot, and a self-locking mechanism 6. The driving mechanism is provided to drive the lifting gear 206 to move, which in turn drives the screw compression rod 207 to move, causing the screw compression rod 207 to press against the spring 208. The self-locking mechanism 6 in the clamping slot then compresses the screw compression rod 207. The screw compression rod 207 is then subjected to an upward reaction force from the spring 208. When the spring 208 drives the screw compression rod 207, the self-locking mechanism 6 is locked in the clamping slot, making it difficult for the self-locking mechanism 6 to slip out of the clamping slot. This ensures that the impact force applied to the target component is stable and controllable, ensures the stability of the impact load, and achieves uniform regional stress distribution in the target component.

[0025] Illustratively, the first bearings 205 are assembled on both sides of the lifting gear 206 , thereby ensuring that the lifting gear 206 can rotate inside the housing 5 , thereby enabling the lifting gear 206 to drive the lead screw compression rod 207 to move.

[0026] Exemplarily, the shell 8 of the ultrasonic impact device in this embodiment is an alloy shell specially made according to the characteristics of the device, so that the device can be isolated from environmental impurities after being sealed.

[0027] The beneficial effects of the mechanical supercharged impact strengthening device for laser additive manufacturing of this embodiment are as follows:

[0028] 1. The mechanical supercharger structure has wide applicability. The speed regulating motor 201 drives the gear 203 and the screw compression rod 207 to apply a controllable impact load to the impact module 9. The impact load can be adjusted according to the applicability of different usage scenarios and laser repair parts with different structural characteristics, so that the performance of the ultrasonic impact gun can be maximized.

[0029] 2. Stable impact load output: Due to the high friction coefficient of the screw, the compression rod 207 and the lifting gear 206 utilize internal contact friction transmission, achieving a self-locking function. Furthermore, the device is equipped with a self-locking mechanism 6. When the compression rod 207 provides a certain impact load, the self-locking mechanism 6 compresses the upper edge of the compression rod 207 and secures it to the corresponding slot on the ultrasonic impact device housing 8. Simultaneously, the end of the compression rod 207 is subjected to the upward reaction force of the spring 208, making it difficult for the self-locking mechanism 6 to slip out of the slot. This ensures that the impact load provided by the mechanical booster maintains its stability during the impact process. An external mounting bracket 7 allows the ultrasonic impact gun to be fixed to large machinery or a manipulator, achieving stable and multi-directional output, further improving the stability of the impact load during operation.

[0030] In one possible embodiment, Figure 1 、 Figure 2 and Figure 3 As shown, the driving mechanism includes: a speed regulating motor 201, which is arranged above the housing 5 and connected to the housing 5; a transmission shaft 202, which is arranged inside the housing 5 and below the speed regulating motor 201, and is connected to the output shaft of the speed regulating motor 201; a gear 203, which is sleeved on the outside of the transmission shaft 202 and meshed with the lifting gear 206; a second bearing 204, which is arranged on the upper and lower sides of the transmission shaft 202 and is connected to the transmission shaft 202.

[0031] Exemplarily, the drive mechanism includes a speed regulating motor 201, a transmission shaft 202, a gear 203, and a second bearing 204. When the speed regulating motor 201 rotates clockwise, it drives the transmission shaft 202 and the gear 203 to rotate clockwise, and the gear 203 engages with the lifting gear 206 externally, causing the lifting gear 206 to rotate counterclockwise. Driven by the internal thread of the lifting gear 206, the end of the screw compression rod 207 moves downward, and the compression spring 208 increases the load size, thereby realizing the automated impact load application process of the mechanical supercharged impact strengthening device. Similarly, when the speed regulating motor 201 rotates counterclockwise, it causes the lifting gear 203 to rotate clockwise, causing the end of the screw compression rod to move upward, and the release spring 208 reduces the load size. The compact mechanical power transmission structure reduces manual operation, realizes the automated process of pressurization and load release, ensures the stable change of the internal pressure of the mechanical supercharged impact strengthening device, thereby avoiding the fluctuation of the impact force, can effectively prevent damage to the target component, and increases the application scenario of the mechanical supercharged impact strengthening device.

[0032] For example, in order to prevent the pressurized impact load from damaging the target component due to load fluctuation during operation, this embodiment has a structural design for the mechanical supercharged impact strengthening device. Since the screw compression rod 207 is used for contact friction transmission with the lifting gear 206, the self-locking function can be achieved due to the large friction coefficient of the screw. At the same time, the self-locking mechanism 6 of the mechanical supercharged impact strengthening device in this embodiment, when the screw compression rod 207 moves downward and the spring 208 provides a certain impact load, the self-locking mechanism 6 presses the upper edge of the end of the screw compression rod 207 and fixes the self-locking mechanism 6 to the corresponding slot of the ultrasonic impact device housing 8. At this time, the end of the screw compression rod 207 is subjected to the upward reaction force of the spring 208, making it difficult for the self-locking mechanism 6 to slip out of the slot, thereby ensuring that the impact load provided by the mechanical supercharged impact strengthening device can maintain the stability of the impact force during the impact process.

[0033] In one possible embodiment, Figure 1 As shown, the ultrasonic impact console 1 is arranged outside the housing 5 and is electrically connected to the speed regulating motor 201.

[0034] Exemplarily, the ultrasonic impact console 1 integrates the signal control of the impact module 9 and the drive motor. The ultrasonic impact console 1 is internally provided with an impact control module, a drive motor control module, a display module and a manual button, which can control the entire impact process in real time, conveniently and quickly.

[0035] In one possible embodiment, Figure 1 As shown, the external fixing frame 7 is arranged in the middle of the ultrasonic impact device housing 8 and is connected to the ultrasonic impact device housing 8.

[0036] Exemplarily, the external fixing frame 7 fixes the mechanical supercharged ultrasonic impact device in this embodiment on a large instrument, thereby enhancing the stability of the impact process and ensuring a constant output of the impact load.

[0037] For example, the external fixing frame 7 can be arranged in the middle of the ultrasonic impact device shell 8 of this embodiment according to actual usage requirements, and is first sleeved on the outside of the ultrasonic impact device shell 8 by a clamping method, and then fastened by bolts. This arrangement not only ensures a flexible fixed connection method, but also takes into account the stability of the installation, thereby ensuring the stability of the mechanical supercharged ultrasonic impact device during the impact process.

[0038] In one possible embodiment, Figure 1 As shown, the impact module 9 is arranged below the ultrasonic impact device housing 8 and is connected to the ultrasonic impact device housing 8.

[0039] Exemplarily, an impact module 9 is provided at the lower end of the ultrasonic impact device housing. The impact module 9 serves as the execution end of the entire device and is used to enhance the mechanical properties of the laser additively manufactured part.

[0040] Exemplarily, the mechanical properties of the laser repaired molded parts are enhanced by the impact module 9 using a high-frequency amplitude with its own weight and applied pressure to efficiently strike the target component. The high-frequency and high-impact impact can cause plastic deformation on the surface of the target component and in a certain depth direction. As the impact continues to intensify, the dislocation movement of the grains inside the target component intensifies, the dislocation density increases, and small equiaxed grains are formed, which strengthens the hardness of the material. In addition, the material inside the target component will hinder the extension of the surface material, thereby generating compressive stress and achieving the purpose of reducing residual tensile stress. The stable impact load output, the increased upper limit of the impact force and the automatic adjustment process enable the mechanical supercharged impact strengthening device of this embodiment to calmly cope with the performance improvement needs of laser additive manufacturing components with diverse structures and complex working conditions.

[0041] In one possible embodiment, Figure 2 As shown, the end cover 3 is arranged on the upper part of the shell 5 and connected to the shell 5; the bolt 4 is passed through the top of the end cover 3 to connect the end cover 3 to the shell 5.

[0042] Exemplarily, the end cover 3 and the outer shell 5 are fixedly connected by bolts 4, so that the internal components of the mechanical supercharged impact strengthening device for laser additive manufacturing in this embodiment are in a closed working environment, thereby isolating environmental impurities to reduce the corrosion of internal parts by environmental impurities.

[0043] This embodiment also provides a control method for a mechanical supercharged impact strengthening device for laser additive manufacturing. The specific steps of the control method include:

[0044] S1: Setting the impact program on the ultrasonic impact control console 1 according to the residual stress distribution characteristics of the target component;

[0045] In step S1, the impact program includes: selecting a large impact load to perform ultrasonic impact strengthening treatment on the target component at a location where the residual stress of the target component is relatively large; selecting a small impact load to treat the target component at a location where the residual stress of the target component is relatively small;

[0046] S2: According to the set impact program, the ultrasonic impact console 1 controls the driving mechanism, thereby driving the lifting gear 206 to move, so that the lifting gear 206 drives the lead screw compression rod to compress the spring 208 to a preset load value;

[0047] S3: The self-locking mechanism 6 fixes the screw compression rod so that the screw compression rod maintains a stable load output according to the preset load value, so that the impact force applied by the impact module 9 to the target component is stable and controllable, and the regional stress distribution of the target component is uniform.

[0048] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any modifications or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included in the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. A mechanical supercharged impact strengthening device for laser additive manufacturing, characterized in that: include: shell; A driving mechanism is disposed inside the housing and connected to the housing; a screw compression rod, which passes through the housing, is disposed adjacent to the drive mechanism, and is connected to the housing; A lifting gear is arranged inside the housing, sleeved on the outside of the lead screw compression rod, and connected to the driving mechanism; A first bearing is sleeved on the outside of the lifting gear and connected to the lifting gear; a spring disposed below the lead screw compression rod and capable of contacting the lead screw compression rod to provide a force for the lead screw compression rod in the direction in which the spring recovers its elastic deformation; An ultrasonic impact device housing is disposed below the outer shell and connected to the outer shell; A card slot is provided on a side wall of the housing of the ultrasonic impact device; A self-locking mechanism is provided inside the clamping slot and is connected to the lead screw compression rod, so that when the spring drives the lead screw compression rod, the self-locking mechanism is clamped in the clamping slot; The driving mechanism comprises: A speed regulating motor is arranged above the housing and connected to the housing; A transmission shaft is disposed inside the housing and below the speed regulating motor, and is connected to an output shaft of the speed regulating motor; a gear, sleeved on the outer side of the transmission shaft and meshing with the lifting gear; The second bearing is arranged on the upper and lower sides of the transmission shaft and is connected to the transmission shaft.

2. The mechanical supercharged impact strengthening device for laser additive manufacturing according to claim 1, characterized in that: Also includes: The ultrasonic impact control console is arranged outside the shell and is electrically connected to the speed regulating motor.

3. The mechanical supercharged impact strengthening device for laser additive manufacturing according to claim 1, characterized in that: Also includes: The external fixing frame is arranged in the middle of the shell of the ultrasonic impact device and is connected to the shell of the ultrasonic impact device.

4. The mechanical supercharged impact strengthening device for laser additive manufacturing according to claim 3, characterized in that: Also includes: The impact module is arranged below the shell of the ultrasonic impact device and is connected to the shell of the ultrasonic impact device.

5. The mechanical supercharged impact strengthening device for laser additive manufacturing according to claim 1, characterized in that: Also includes: an end cover, disposed on the upper portion of the shell and connected to the shell; A bolt is passed through the top end of the end cover to connect the end cover with the shell.

6. A control method for a mechanical supercharged impact strengthening device for laser additive manufacturing according to claim 1, characterized in that: The specific steps of the control method include: S1: According to the residual stress distribution characteristics of the target component, the impact program is set on the ultrasonic impact console; S2: According to the set impact program, the ultrasonic impact console controls the driving mechanism, which in turn drives the lifting gear to move, so that the lifting gear drives the screw compression rod to compress the spring to the preset load value; S3: The self-locking mechanism fixes the screw compression rod, so that the screw compression rod maintains a stable load output according to the preset load value, so that the impact force applied by the impact module to the target component is stable and controllable, and the regional stress distribution of the target component is uniform.

7. The control method of the mechanical supercharged impact strengthening device for laser additive manufacturing according to claim 6, characterized in that: In step S1, the impact program is set up including: At the location where the residual stress of the target component is concentrated, a large impact load is selected to perform ultrasonic impact strengthening treatment on the target component; Where the residual stress concentration of the target component is small, a small impact load is selected to treat the target component.

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