Shaft part additive repairing device and method

Abstract

The shaft part additive repairing device comprises a supporting part, the supporting part comprises a numerical control lathe, the numerical control lathe is provided with a center frame, and the lower portion of the center frame is connected with the numerical control lathe through a supporting rod gasket; a transmission shaft and a motor are coaxially arranged behind the center frame; the additive material repairing welding gun is arranged above the shaft part; the impact rolling part comprises an electromagnetic motor, the electromagnetic motor provides impact power to a force transmission spring, the force transmission spring is connected with a force transmission pressing piece, the impact power is transmitted to a pressing rod through the force transmission pressing piece, and a rolling wheel is arranged at the middle point of the pressing rod; the shaft part is subjected to rolling impact through the rolling wheel, and through cooperative control of the additive repair welding gun and the impact rolling part, plastic deformation generated after impact can compensate for weld joint shrinkage, so that the effects of reducing residual stress and improving cladding metal compactness are achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of machining, and in particular to an additive repair device and method for shaft parts. Background Art

[0002] Additive repair is a remanufacturing technology based on the principle of additive manufacturing. It uses heat sources such as electric arcs and lasers to melt and deposit powders, wires or strips on the surface of the repaired area to achieve the repair of damaged parts. With the development of the national circular economy, higher requirements have been put forward for the repair technologies of various parts.

[0003] During the process of additive repairing shaft parts, due to the material experiencing a locally rapid heating and cooling process, high residual stresses will be generated in the repaired area; secondly, additive repair processes are prone to manufacturing defects such as poor forming and porosity. In order to reduce the influence of residual stresses and manufacturing defects, shaft parts often need to undergo heat treatment or machining steps after repair, greatly increasing the repair cost and complexity. Currently, the mainstream treatment solutions include optimizing the process, optimizing the scanning path, heat treatment, ultrasonic peening, etc. However, when repairing shaft parts, it is very difficult to effectively control the residual stresses and repair quality only by optimizing the process and scanning path. Heat treatment has a good effect on improving the mechanical properties of parts, but overall heat treatment of parts will reduce the performance of the part substrate. Ultrasonic peening can release stresses and refine grains, but the output power of continuous ultrasonic peening is unstable and it is easy to cause damage to the additive surface. Summary of the Invention

[0004] By providing an additive repair device and method for shaft parts in the embodiments of the present application, the technical problem in the prior art that after multiple additive repairs of damaged parts, heat treatment or machining steps are still required to meet the forming requirements, and the entire repair process is cumbersome, is solved. The functions of impact rolling on the parts during the additive repair process are realized, reducing residual stresses and improving the density of the clad metal. At the same time, it can also refine grains, improve the mechanical properties and service life of the repaired parts.

[0005] The embodiments of the present application provide an additive repair device for shaft parts, characterized by comprising:

[0006] A support part, the support part includes a numerically controlled lathe, a steady rest is arranged on the numerically controlled lathe, and the steady rest is connected to the numerically controlled lathe through a support rod gasket below; a transmission shaft and a motor are coaxially arranged behind the steady rest; the shaft part is connected to the transmission shaft through the steady rest, and the motor drives the shaft part to rotate;

[0007] An additive repair welding torch, the additive repair welding torch is arranged above the shaft part, near the steady rest;

[0008] The impact rolling part is arranged on the side of the shaft part and is in the same vertical plane as the additive repair welding torch with respect to the shaft part; the impact rolling part includes an electromagnetic motor, and the battery motor provides impact power to a force transmission spring, the force transmission spring is connected to a force transmission pressure plate, and the impact power is transmitted to a pressure rod through the force transmission pressure plate. A rolling wheel is arranged at the midpoint of the pressure rod, and the rolling wheel performs rolling impact on the shaft part.

[0009] Preferably, the impact rolling part further includes an analysis and storage device; the analysis and storage device is used to control the impact force, impact frequency, and rotation speed of the impact rolling part.

[0010] Preferably, the numerical control lathe is provided with a slide seat parallel to the shaft part, and the impact rolling part is fixed to the slide seat for adjusting the position of the impact rolling part.

[0011] Preferably, the additive repair welding torch is fixed on the slide seat for synchronously adjusting the positions of the impact rolling part and the additive repair welding torch.

[0012] Preferably, the shaft part additive repair device further includes an optical sensor.

[0013] This application also proposes a method for using a shaft part additive repair device, which is characterized by including the following steps:

[0014] Step S1: Install the shaft part on the numerical control lathe, and place the rolling wheel of the impact rolling part at the part to be repaired of the shaft part;

[0015] Step S2: Set the impact force, impact frequency, and rotation speed of the impact rolling part;

[0016] Step S3: Start the motor and the additive repair welding torch to perform additive repair on the shaft part;

[0017] Step S4: After the additive repair welding torch finishes working, keep the motor of the numerical control lathe running so that the impact rolling device continues to work for a period of time while the metal has not cooled to ensure the forming quality of the shaft part;

[0018] Step S5: After completing the impact rolling of all additive repair areas, turn off the motor. After the transmission shaft stops, check the repair quality of the shaft part and analyze the collected working parameters through the data storage unit. The optical sensor scans and detects the surface defect degree of the repaired shaft part, and compares the data exported by the optical sensor with that of a good part to determine the repair situation and perform optimization.

[0019] One or more technical solutions provided in the embodiments of this application have at least the following technical effects or advantages:

[0020] 1. Due to the setting of the impact rolling part and the additive repair welding torch, during the additive repair process, the force is transmitted from the electromagnetic power device of the equipment to the rolling wheel at the end of the pressure rod, and impact rolling is applied to a specific area behind the molten pool. The plastic deformation generated after the impact can compensate for the weld shrinkage, thereby reducing the residual stress and improving the density of the clad metal, avoiding the limitations of post-repair heat treatment and other solutions in the additive repair of shaft parts, better ensuring the mechanical properties of the repaired parts, and reducing energy consumption.

[0021] 2. Through the setting of the impact rolling part, problems such as high residual stress, pores, and coarse grains that are prone to occur in the additive repair of shaft parts and curved surface parts are solved. At the same time, the residual stress and residual deformation of the parts can be controlled, and the repair quality can be improved.

[0022] 3. By controlling and recording the impact force, impact frequency, and rotation speed parameters during the working process of the impact rolling part, precise control of the repair process is achieved, and the impact magnitude and impact frequency during the working process are collected, facilitating subsequent analysis and optimization of the process parameters. Brief Description of the Drawings

[0023] Figure 1 It is a working schematic diagram of the additive repair device for shaft parts in the first embodiment of the present application;

[0024] Figure 2 It is a structural schematic diagram of the additive repair device for shaft parts in the first embodiment of the present application;

[0025] Figure 3 It is the main view of the additive repair device for shaft parts in the first embodiment of the present application;

[0026] Figure 4 It is the top view of the additive repair device for shaft parts in the first embodiment of the present application;

[0027] Figure 5 It is a structural schematic diagram of the impact rolling part in the first embodiment of the present application;

[0028] Figure 6 It is a flowchart of the additive repair method for shaft parts in the second embodiment of the present application;

[0029] In the figure: 1. CNC lathe; 2. Shaft part; 3. Additive repair welding torch; 4. Transmission shaft; 5. Motor; 6. Impact rolling part; 7. Center rest; 8. Electromagnetic motor; 9. Force transmission spring; 10. Analysis and storage device; 11. Rolling wheel; 12. Force transmission pressing piece; 13. Pressure rod. Detailed Embodiments

[0030] In order to better understand the above technical solutions, the above technical solutions will be described in detail below in conjunction with the accompanying drawings of the specification and specific embodiments.

[0031] Example 1

[0032] As Figure 1 shown, an additive repair device for shaft parts, as Figure 2 , Figure 3 , Figure 4 shown, includes: a support part, the support part includes a CNC lathe 1, a steady rest 7 is arranged on the CNC lathe 1, and the steady rest 7 is connected to the CNC lathe 1 through a support rod gasket below; a transmission shaft 4 and a motor 5 are coaxially arranged behind the steady rest 7; the shaft part 2 is connected to the transmission shaft 4 through the steady rest 7, and the motor 5 drives the shaft part 2 to rotate; the damaged shaft part 2 is fixed to the transmission shaft 4 of the lathe, and the steady rest 7 is sleeved on the damaged shaft part 2 to ensure the stiffness of the part and prevent secondary damage to the part caused by the impact during repair.

[0033] An additive repair welding torch, the additive repair welding torch 3 is arranged above the shaft part, near the steady rest.

[0034] An impact rolling part, the impact rolling part 6 is arranged on the side of the shaft part and is in the same vertical plane as the additive repair welding torch 3 on the shaft part 2; as Figure 5 shown, the impact rolling part 6 includes an electromagnetic motor 8, the electromagnetic motor 8 provides impact power to a force transmission spring 9, the force transmission spring 9 is connected to a force transmission pressure plate 12, the impact power is transmitted to a pressure rod 13 through the force transmission pressure plate 12, a rolling wheel 11 is arranged at the midpoint of the pressure rod 13, and the rolling wheel 11 performs rolling impact on the shaft part 2.

[0035] The motor 5 behind the lathe gives power to make the part rotate around the longitudinal axis. Among them, the additive repair welding torch 3 is relatively behind and rotates, and the rotation speed is selected according to actual working needs. During work, the additive repair welding torch 3 performs additive repair on the damaged area of the part, and the impact rolling device 6 applies impact rolling to a specific position behind the molten pool.

[0036] The impact rolling part 6 further includes an analysis and storage device 10; the analysis and storage device 10 is used to record the impact force, impact frequency, and rotation speed of the impact rolling part during the working process. The analysis and storage device 10 further includes a control unit, and the control unit is used to control the impact force, impact frequency, and rotation speed of the impact rolling part during the working process.

[0037] The electromagnetic relay in the electromagnetic motor 8 can drive the spring to expand and contract repeatedly to achieve the purpose of impacting a region at a certain frequency, and the rolling part is completed by the rotation speed of the rolling wheel 11 itself. After the work is completed, the rotation speed, impact force, and impact frequency during the next work are optimized through the data of the analysis and storage device 10.

[0038] The numerically controlled lathe 1 is provided with a carriage parallel to the shaft-like part 2, and the impact rolling part 6 is fixed to the carriage for adjusting the position of the impact rolling part. The additive repair welding torch 3 is fixed on the carriage for synchronously adjusting the positions of the impact rolling part 6 and the additive repair welding torch 3.

[0039] Embodiment 2

[0040] The present application also proposes a method for additive repair of shaft-like parts, including:

[0041] (1) Fix the shaft-like part 2 on the numerically controlled lathe 1.

[0042] (2) Place the rolling wheel 11 of the impact rolling device 6 at the repair position of the shaft-like part 2, and place and fix the impact rolling device 6 perpendicular to the shaft-like part 2.

[0043] (3) Set the rotation speed, impact force, and impact frequency of the impact rolling device 6.

[0044] (4) Start the motor 5 and the additive repair welding torch 3 to perform additive repair on the shaft-like part 2. As the repair process progresses, the electromagnetic motor 8 of the impact rolling device 6 drives the force transmission spring 9 to the rolling wheel 11 to impact and roll the molten pool behind the repair area. During multi-pass repair, the impact rolling device 6 can be fixed on the carriage of the numerically controlled lathe 1 to adjust the position.

[0045] (5) After the additive repair welding torch 3 finishes working, keep the numerically controlled lathe motor 5 running so that the impact rolling device 6 continues to work for a period of time before the metal cools to ensure the forming quality of the shaft-like part 2.

[0046] (6) After completing the impact rolling of all additive repair areas, turn off the motor 5. After the transmission shaft 4 stops, check the repair quality of the shaft-like part 2 and analyze the collected working parameters through the data storage unit 10 for optimization.

[0047] The embodiments of this specific implementation manner are all preferred embodiments of the present invention, and do not limit the protection scope of the present invention accordingly. Therefore, all equivalent changes made according to the structure, shape, and principle of the present invention should be covered within the protection scope of the present invention. Although the preferred embodiments of the present invention have been described, those skilled in the art can make additional changes and modifications to these embodiments once they know the basic creative concept. Therefore, the appended claims are intended to be interpreted to include the preferred embodiments as well as all changes and modifications falling within the scope of the present invention. Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention is also intended to include these modifications and variations.

Claims

1. An additive repair device for shaft parts, characterized in that, Including: A support part, the support part includes a CNC lathe, the CNC lathe is provided with a steady rest, and the lower part of the steady rest is connected to the CNC lathe through a support rod gasket; a transmission shaft and a motor are coaxially arranged behind the steady rest; the shaft part is connected to the transmission shaft through the steady rest, and the motor drives the shaft part to rotate; An additive repair welding torch, the additive repair welding torch is arranged above the shaft part, near the steady rest; An impact rolling part, the impact rolling part is arranged on the side of the shaft part and is in the same vertical plane of the shaft part as the additive repair welding torch; the impact rolling part includes an electromagnetic motor, the battery motor provides impact power to a transmission spring, the transmission spring is connected to a transmission pressure plate, the impact power is transmitted to a pressure rod through the transmission pressure plate, a rolling wheel is arranged at the midpoint of the pressure rod, and the rolling wheel performs rolling impact on the shaft part.

2. The additive repair device for shaft parts according to claim 1, characterized in that The impact rolling part further includes an analysis and storage device; the analysis and storage device is used to record the impact force, impact frequency, and rotation speed of the impact rolling part during the working process.

3. The additive repair device for shaft parts according to claim 2, wherein, The analysis and storage device further includes a control unit, and the control unit is used to control the impact force, impact frequency, and rotation speed of the impact rolling part during the working process.

4. The additive repair device for shaft parts according to claim 1, characterized in that, The CNC lathe is provided with a slide seat parallel to the shaft part, and the impact rolling part is fixed on the slide seat for adjusting the position of the impact rolling part.

5. The additive repair device for shaft parts according to claim 4, characterized in that, The additive repair welding torch is fixed on the slide seat for synchronously adjusting the positions of the impact rolling part and the additive repair welding torch.

6. The additive repair device for shaft parts according to claim 1, characterized in that, The shaft part additive repair device further includes an optical sensor.

7. The method of using the additive repair device for shaft parts according to any one of claims 1-6, characterized in that Including the following steps: Step S1, install the shaft part on the CNC lathe, and place the rolling wheel of the impact rolling part at the part to be repaired of the shaft part; Step S2, set the impact force, impact frequency, and rotation speed of the impact rolling part; Step S3, start the motor and the additive repair welding torch to perform additive repair on the shaft part; Step S4, after the additive repair welding torch finishes working, keep the motor of the CNC lathe running so that the impact rolling device continues to work for a period of time before the metal cools to ensure the forming quality of the shaft part; Step S5, after completing the impact rolling of all additive repair areas, turn off the motor. After the transmission shaft stops, check the repair quality of the shaft part and pass the working parameters of the impact rolling part; The optical sensor scans and detects the surface defect degree of the repaired shaft part, compares the data exported by the optical sensor with that of a good part to determine the repair situation, and performs optimization.

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