A floating type ultrasonic bolt thread rolling machine and a thread bottom finishing strengthening method

Abstract

The present application relates to the field of bolt thread rolling, in particular to a floating type ultrasonic bolt thread rolling machine and a thread bottom finishing and strengthening method. The thread rolling machine comprises a frame, a thread rolling wheel arranged on the frame, and an ultrasonic thread rolling unit assembled on the frame. The ultrasonic thread rolling unit comprises an ultrasonic generator and an ultrasonic finishing wheel connected with the ultrasonic generator. The ultrasonic finishing wheel is arranged around the processed bolt at the same axial position of the thread rolling wheel during use. The floating type ultrasonic bolt thread rolling machine of the present application is provided with an ultrasonic thread rolling unit on the frame, and the ultrasonic finishing wheel of the ultrasonic thread rolling unit is arranged around the processed bolt at the same axial position of the thread rolling wheel. Therefore, the finishing work of the thread can be completed at the same time of the thread rolling, that is, the thread forming and the thread bottom finishing and strengthening are realized at one time, thereby improving the processing efficiency of the thread and solving the problem of low processing and finishing and strengthening efficiency of the thread.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of bolt thread rolling, in particular to a floating ultrasonic bolt thread rolling machine and a thread bottom finishing and strengthening method. BACKGROUND

[0002] At present, the main manufacturing process of bolts is blanking-upsetting-heat treatment-turning-grinding-rolling thread-rolling R-finished product-inspection-warehousing, etc. Due to the notch sensitivity of the thread surface, the bolt is prone to cracking during use, thereby causing the service failure of the whole machine equipment bearing member, and even causing structural fracture and personnel casualties. And this problem is particularly prominent on the bolts of aluminum alloy materials. In order to solve this problem, the current method is to perform finishing or strengthening treatment again after thread forming to improve the surface integrity of the thread. In the above processing method, the thread forming and finishing and strengthening treatment need to be carried out in steps, which has the problem of low efficiency, and at the same time, since the finishing and strengthening treatment process is a fixed process, the material properties of different bolt parts may be different, and the final quality of the bolts treated by the same process cannot be guaranteed. SUMMARY

[0003] The purpose of the present application is to provide a floating ultrasonic bolt thread rolling machine to solve the problem of low efficiency of thread processing and finishing and strengthening.

[0004] At the same time, the purpose of the present application is also to provide a thread bottom finishing and strengthening method to solve the problem of low efficiency of bolt production and finishing and strengthening.

[0005] In order to solve the above problems, the floating ultrasonic bolt thread rolling machine of the present application adopts the following technical scheme: a floating ultrasonic bolt thread rolling machine, comprising a rack, a thread rolling wheel is arranged on the rack, an ultrasonic thread rolling unit is also assembled on the rack, the ultrasonic thread rolling unit comprises an ultrasonic generator and an ultrasonic finishing wheel connected with the ultrasonic generator, and the ultrasonic finishing wheel is arranged around the processed bolt at the same axial position of the processed bolt as the thread rolling wheel during use.

[0006] Beneficial effects: the floating ultrasonic bolt thread rolling machine of the present application is provided with an ultrasonic thread rolling unit on the rack, and the ultrasonic finishing wheel of the ultrasonic thread rolling unit is arranged around the processed bolt at the same axial position of the processed bolt as the thread rolling wheel, so that the finishing work of the thread can be completed at the same time as the thread rolling, that is, the thread forming and thread bottom finishing and strengthening are realized at one time, thereby improving the processing efficiency of the thread and solving the problem of low efficiency of thread processing and finishing and strengthening.

[0007] Further, an image acquisition device is arranged near the thread rolling position of the thread rolling wheel and faces the thread rolling position, the image acquisition device and the ultrasonic thread rolling unit are connected to a controller, the controller can adjust the parameters of the ultrasonic thread rolling unit according to the image information acquired by the image acquisition device, so as to control the finishing quality of the ultrasonic finishing wheel. The image acquisition device can be used to acquire the surface quality parameters (surface roughness, three-dimensional morphology, etc.) of the processed thread, and then the quality of the thread can be judged according to these characteristics, and the parameters (ultrasonic frequency, ultrasonic amplitude, pressure of the ultrasonic finishing wheel on the workpiece, etc.) of the ultrasonic thread rolling unit are adjusted according to the parameters, so as to finally ensure that the bolt reaches the standard.

[0008] Further, the image acquisition device is provided with a gas blowing device for cleaning the acquisition point of the image acquisition device. The gas blowing device can ensure the cleanliness of the surface of the acquired thread, avoid the interference of lubricating oil, and make the image acquisition result more accurate.

[0009] Further, the ultrasonic finishing wheel is provided with a friction torque module for controlling the constancy of the friction force and the friction coefficient in the processing process. The constancy of the friction force and the friction coefficient can further ensure the consistency of the quality of the processed thread.

[0010] Further, the ultrasonic finishing wheel of the ultrasonic thread rolling unit is floatingly assembled on the rack, one end of the ultrasonic generator is fixed on the rack, and a gas pressure device is arranged between the ultrasonic finishing wheel and the ultrasonic generator. The gas pressure device can adjust the pressure of the ultrasonic finishing wheel on the workpiece, and at the same time ensure that it always maintains contact with the workpiece, thereby optimizing the finishing effect.

[0011] Further, a floating guide rail is arranged between the ultrasonic finishing wheel and the rack. The floating guide rail can ensure the reliability and controllability of the ultrasonic finishing wheel during movement.

[0012] The thread bottom finishing reinforcement method of the present application adopts the following technical scheme:

[0013] The thread bottom finishing reinforcement method is to perform thread rolling forming on a screw rod, and at the same time, an ultrasonic finishing wheel with an ultrasonic generator is used to perform finishing reinforcement on the thread at the thread rolling position.

[0014] Beneficial effects: The thread bottom finishing reinforcement method of the present application performs thread rolling forming on a screw rod, and at the same time, an ultrasonic finishing wheel with an ultrasonic generator is used to perform finishing reinforcement on the thread at the thread rolling position, so that thread forming and thread bottom finishing reinforcement can be realized at one time, thereby improving the processing efficiency of the thread and solving the problem of low processing and finishing reinforcement efficiency of the thread.

[0015] Further, in the process of finishing strengthening the thread, the finishing effect is obtained by collecting the image information at the finishing position, and the parameters of the finishing wheel are adjusted according to the finishing effect, so as to achieve the set finishing result. The image information (surface roughness, three-dimensional morphology, etc.) features at the finishing position are collected, and whether the thread quality meets the standard can be judged according to these features, and the parameters (ultrasonic frequency, ultrasonic amplitude, pressure of the ultrasonic finishing wheel on the workpiece, etc.) of the ultrasonic thread rolling unit are adjusted according to the above, so as to finally ensure that the qualified bolt is obtained.

[0016] Further, when collecting the image information at the finishing position, the collection point is sprayed to ensure that the thread of the collection point is clean.

[0017] Further, the friction torque at the ultrasonic finishing wheel is detected, and the pressure of the ultrasonic finishing wheel on the thread is adjusted according to the detection result, so as to ensure the constancy of the friction force and the friction coefficient in the machining process, thereby ensuring the consistency of the thread finishing effect. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 is a schematic diagram of embodiment 1 of the floating ultrasonic bolt thread rolling machine of the present application;

[0019] Figure 2 is a structural schematic diagram of the ultrasonic thread rolling unit in Figure 1

[0020] Figure 3 is a structural schematic diagram of the wheel frame in Figure 2

[0021] Figure 4 is a flow chart of the working process of embodiment 1 of the floating ultrasonic bolt thread rolling machine of the present application;

[0022] Figure 5 is an effect diagram of the thread processed according to the thread bottom finishing strengthening method of the present application.

[0023] In the figure: 11, rack; 111, opening; 12, thread rolling wheel; 13, ultrasonic thread rolling unit; 131, ultrasonic finishing wheel; 132, air cylinder; 133, ultrasonic generator; 14, air pump; 15, controller; 16, friction torque module; 17, bolt; 18, image collection device; 19, air blowing device; 20, lubrication port. DETAILED DESCRIPTION

[0024] ​​In order to make the objects, technical solutions and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application, i.e., the described embodiments are only some of the embodiments of the present application, but not all the embodiments. The components of the embodiments of the present application generally described and shown in the accompanying drawings can be arranged and designed in various different configurations.

[0025] Therefore, the detailed description of the embodiments of the present application provided below in the accompanying drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0026] It should be noted that the relationship terms such as "first" and "second" and the like that can appear are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between the entities or operations. Moreover, terms such as "include", "contain" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or device. Without more limitations, the elements defined by the statement "including a…" and the like do not exclude the presence of additional identical elements in the process, method, article or device including the elements.

[0027] The features and performances of the present application will be further described in detail below in conjunction with the embodiments.

[0028] Embodiment 1 of the floating ultrasonic bolt thread rolling machine of the present application:

[0029] As shown in Figures 1-3 , the main components of the floating ultrasonic bolt thread rolling machine of the present application include a rack 11, a thread rolling wheel 12, an ultrasonic thread rolling unit 13, an air pump 14, a controller 15 and a friction torque module 16.

[0030] The specific structure of the rack 11 is not shown in the figure, and it should be noted that the rack 11 in the present application only serves to mount the above parts, as long as the mounting requirements described above can be met, and there is no special requirement for its structure, therefore it is not described here.

[0031] The two thread rolling wheels 12 have their own structure and mounting structure on the frame, which are not described here. In the embodiment, the two thread rolling wheels 12 are horizontally movable thread rolling wheels, which can move closer to and away from each other by horizontal movement.

[0032] The ultrasonic thread rolling unit 13 includes an ultrasonic finishing wheel 131, an air cylinder 132 and an ultrasonic generator 133. The ultrasonic generator 133 is mounted on the frame 11, and is drivingly connected with the ultrasonic finishing wheel 131 through the air cylinder 132. In use, the air cylinder 132 is connected with the air pump 14, which can keep the ultrasonic finishing wheel 131 in contact with the bolt piece 17 (the workpiece being processed) and can adjust the pressure applied by the ultrasonic finishing wheel 131 to the bolt piece 17. The ultrasonic finishing wheel 131 is located at the same position as the two thread rolling wheels 12 in the axial direction of the bolt piece 17 in use, and is distributed circumferentially around the bolt piece 17, so that the thread can be finished and strengthened at the same time as the thread rolling. The ultrasonic generator 133 and the air pump 14 are both connected to the controller 15, and the parameters of the air pump 14 and the ultrasonic generator 133 can be adjusted accordingly through the controller 15.

[0033] As shown in the figure, the ultrasonic finishing wheel 131 is mounted on the frame 11. In order to guide the movement of the ultrasonic finishing wheel 131 with the air cylinder 132, a floating guide rail is provided on the frame 11. The structure of the floating guide rail is shown in Figure 3 In the embodiment, the opening 111 is provided on the frame 11, and the hole wall of the opening 111 constitutes the floating guide rail.

[0034] The frame 11 is also provided with an image acquisition device 18 (optical surface quality monitoring module) near the thread rolling position of the thread rolling wheel 12, which is directed towards the thread rolling position. The image acquisition device 18 is used to acquire the surface quality parameter (surface roughness, three-dimensional topography, etc.) characteristics of the processed thread. In order to avoid the influence of impurities such as lubricating liquid on the quality of image acquisition, the image acquisition device 18 is provided with a gas blowing device 19, which can blow and clean the image acquisition position through the high-pressure gas sprayed from the blowing port. The image acquisition device is connected to the controller 15, and the preset thread surface parameter threshold value in the controller 15 can be compared with the acquisition information of the image acquisition device, and the parameters (such as ultrasonic frequency and ultrasonic amplitude of the ultrasonic generator) of the ultrasonic thread rolling unit 13 can be automatically adjusted (in other embodiments, the parameters can also be manually adjusted through the controller) to obtain the desired thread surface quality.

[0035] The friction torque module 16 is arranged at the ultrasonic finishing wheel 131, and includes a friction torque sensor connected with the controller 15, and is used to acquire the friction force, friction coefficient and the like in the thread rolling process, and the friction force and friction coefficient are kept constant during the process, thereby ensuring the consistency of the thread finishing effect. During the operation of the ultrasonic finishing wheel, the friction torque sensor collects the cutting force in the process, and then the controller 15 calculates the horizontal tangential force, and based on the known vertical load acting on the ultrasonic generator, the controller 15 obtains the real-time friction coefficient by using the formula μ=F / N.

[0036] When the bolt 17 is processed by using the thread rolling machine, the power supply can be started first, the air pressure parameters, the ultrasonic parameters and the friction torque parameters are adjusted, the bolt 17 is placed in the thread rolling position for thread rolling, the lubricating oil flows out from the lubricating port 20 during the thread rolling process, and then the lubricating oil on the thread surface is blown clean by the high-pressure gas blown out from the blowing port of the air blowing device 19, then the image acquisition module acquires the surface quality parameter (surface roughness, three-dimensional morphology and the like) features of the formed thread, and compares with the preset surface quality and friction torque parameters of the controller 15, the ultrasonic parameters and the air pressure parameters of the ultrasonic finishing wheel 131 are adjusted online, so that the thread surface has a higher surface quality, and the thread surface and the subsurface obtain a higher residual compressive stress field and microhardness, and the fatigue strength of the bolt is greatly improved. The working process of the thread rolling machine is as shown in Figure 4 .

[0037] Embodiment of the thread bottom finishing strengthening method of the application:

[0038] The method is to perform thread rolling forming on the screw rod, and to perform finishing strengthening on the thread at the thread rolling position by using the ultrasonic finishing wheel with an ultrasonic generator, wherein during the finishing strengthening of the thread, the finishing effect is acquired by collecting image information at the finishing position, and the parameters of the finishing wheel are adjusted according to the finishing effect, so as to achieve the set finishing result. When the image information at the finishing position is collected, the collection point is blown to ensure that the thread at the collection point is clean. During the finishing strengthening process, the friction torque at the ultrasonic finishing wheel is controlled to ensure that the friction force and the friction coefficient are constant during the process, thereby ensuring the consistency of the thread finishing effect. Figure 5 An effect diagram of the thread processed by using the thread bottom finishing strengthening method of the application is shown, and it can be known from the diagram that the surface quality of the thread bottom is obviously improved by using the method of the application, and the quality is uniform.

Claims

1. A floating type ultrasonic bolt thread rolling machine comprising a machine frame (11) provided with a thread rolling wheel (12) thereon, characterized in that, The rack (11) is further equipped with an ultrasonic thread rolling unit (13), which comprises an ultrasonic generator (133) and an ultrasonic finishing wheel (131) connected with the ultrasonic generator (133). The ultrasonic finishing wheel (131) is arranged around the processed bolt at the same axial position of the thread rolling wheel (12) during use, and completes the finishing work of the thread at the same time of thread rolling. The ultrasonic finishing wheel (131) of the ultrasonic thread rolling unit (13) is floatingly equipped on the rack (11), one end of the ultrasonic generator (133) is fixed on the rack (11), and an air pressure device is arranged between the ultrasonic generator (133) and the ultrasonic finishing wheel (131).

2. The floating ultrasonic bolt thread rolling machine of claim 1, wherein, An image acquisition device (18) is further arranged near the thread rolling position of the thread rolling wheel (12) and faces the thread rolling position. The image acquisition device (18) is connected with the ultrasonic thread rolling unit (13) to a controller (15). The controller (15) can adjust the parameters of the ultrasonic thread rolling unit according to the image information acquired by the image acquisition device, so as to control the finishing quality of the ultrasonic finishing wheel (131).

3. The floating ultrasonic bolt thread rolling machine of claim 2, wherein, The image acquisition device (18) is provided with an air blowing device (19) for cleaning the acquisition point of the image acquisition device.

4. The floating ultrasonic bolt thread rolling machine according to any one of claims 1-3, characterized in that, The ultrasonic finishing wheel (131) is provided with a friction torque module (16) for controlling the constant friction and friction coefficient during the processing.

5. The floating ultrasonic bolt thread rolling machine according to any one of claims 1-3, wherein, A floating guide rail is arranged between the ultrasonic finishing wheel (131) and the rack (11).

6. Threaded bottom finishing and strengthening method, characterized in that, The method is implemented by using the thread rolling machine of any one of claims 1-5. The thread is finished and strengthened by the ultrasonic finishing wheel with the ultrasonic generator at the thread rolling position during the thread rolling of the screw rod.

7. The thread bottom finishing method of claim 6 wherein, During the finishing and strengthening of the thread, the finishing effect is obtained by acquiring the image information at the finishing position, and the parameters of the finishing wheel are adjusted according to the finishing effect, so as to achieve the set finishing result.

8. The thread bottom finishing method of claim 7 wherein, When the image information at the finishing position is acquired, the acquisition point is sprayed to ensure the cleanliness of the thread at the acquisition point.

9. Threaded bottom finishing method according to any one of claims 6-8, characterized in that, The friction torque at the ultrasonic finishing wheel is controlled to ensure the constant friction and friction coefficient during the processing, so as to ensure the consistency of the thread finishing effect.

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