Electric pulse auxiliary cutting-rolling composite surface strengthening device and machining method

Abstract

The invention discloses an electric pulse auxiliary cutting-rolling composite surface strengthening device and a machining method, and relates to the technical field of metal material surface treatment, the electric pulse auxiliary cutting-rolling composite surface strengthening device comprises a rolling device and an electric pulse auxiliary turning device; the rolling device comprises a fixed base, a mounting sleeve and rolling assemblies, and the multiple rolling assemblies are evenly arranged in an inner cavity of the mounting sleeve in the circumferential direction; the rolling assembly comprises a floating base, a rolling base, a guide cylinder and a rolling end cover which are connected in sequence, a spherical cavity is formed between the guide cylinder and the rolling end cover, and balls are installed in the spherical cavity; the electric pulse auxiliary turning device comprises a first electric brush and a second electric brush, the first electric brush is installed on the lathe bed and makes contact with the chuck mechanism, the second electric brush is installed on the fixed base and used for making contact with the workpiece, and the first electric brush and the second electric brush are connected with the positive electrode and the negative electrode of the pulse power source respectively. The electric pulse treatment is introduced into the cutting process, the rolling effect can be enhanced, thermal stress and thermal deformation can be reduced during rolling, and the machining precision is improved.

Description

Technical Field

[0001] The invention relates to the technical field of metal material surface treatment, and in particular to an electric pulse assisted cutting-rolling composite surface strengthening device and a processing method. Background Art

[0002] In today's era of rapid technological development, the progress of the manufacturing industry cannot be separated from the support of various advanced technologies and equipment. As the foundation of the manufacturing industry, the development level of cutting technology and cutting equipment directly affects the competitiveness of the entire manufacturing industry. In recent years, with the development of modern science and technology, higher requirements have been put forward for the surface properties of materials or components. To a certain extent, the single rolling technology can no longer meet the high performance requirements of the equipment for parts.

[0003] At present, the main rolling processes include ultrasonic vibration assisted rolling and laser assisted rolling, which increase the equipment investment and increase the processing cost of parts. The previous process of the rolling process of parts is often cutting. The existing cutting technology forms a thin, high dislocation density, and high work hardening rate metamorphic layer on the surface of the workpiece, which is difficult to have a significant positive impact on the rolling process of parts. Moreover, during the rolling process, the workpiece and the tool generate a lot of heat, and the workpiece is prone to thermal stress and thermal deformation, which will have an adverse effect on the processing accuracy of the workpiece.

[0004] Based on this, the inventor proposed an electric pulse assisted cutting-rolling composite surface strengthening device and processing method to solve the above problems. Summary of the invention

[0005] The purpose of the present invention is to provide an electric pulse assisted cutting-rolling composite surface strengthening device and processing method to solve the problems existing in the above-mentioned prior art. By introducing electric pulse treatment into the cutting process, the dislocation density on the surface of the cutting workpiece is reduced, the grains are greatly refined, and the thickness of the metamorphic layer is increased, the dynamic recrystallization of the rolling process is promoted, and a surface hardening layer with further refined grains and doubled thickness is formed on the surface of the workpiece during heat and mass transfer, the rolling effect is enhanced, and thermal stress and thermal deformation can be reduced during rolling, thereby improving the processing accuracy.

[0006] To achieve the above object, the present invention provides the following solutions:

[0007] The present invention provides an electric pulse assisted cutting-rolling composite surface strengthening device, comprising a machine tool, wherein a chuck mechanism and a tailstock mechanism are respectively arranged at the front and rear ends of the machine tool, a slide box is arranged between the chuck mechanism and the tailstock mechanism, and further comprising a rolling device and an electric pulse assisted turning device;

[0008] The rolling device comprises a fixed base, a mounting sleeve and a rolling assembly, wherein the fixed base is mounted on the upper end of the slide box, the mounting sleeve is mounted on the fixed base, the central axis of the mounting sleeve is colinear with the line connecting the center of the chuck mechanism and the top of the tailstock mechanism, the mounting sleeve is located on the side of the tool holder away from the chuck mechanism, and the inner cavity of the mounting sleeve is evenly provided with a plurality of the rolling assemblies along the circumferential direction;

[0009] The rolling assembly comprises a floating base, a rolling base, a guide cylinder and a rolling end cover which are connected in sequence, the floating base being cooperatively mounted in a groove in the inner cavity of the mounting sleeve, a spherical cavity being formed between the guide cylinder and the rolling end cover, a ball being mounted in the spherical cavity, the ball protruding outward from the rolling end cover for rolling the workpiece, the floating base, the rolling base, the guide cylinder and the rolling end cover being internally connected to form a coolant channel, a plurality of liquid outlet holes are arranged on the end surface of the rolling end cover, a liquid guide channel which respectively corresponds to and is connected with the coolant channels of each rolling assembly is arranged in the side wall of the mounting sleeve, the coolant is sprayed from the liquid outlet holes to the rolling part of the workpiece through the liquid guide channel and the coolant channel;

[0010] The electric pulse assisted turning device includes a first brush and a second brush. The first brush is installed on the bed and contacts the chuck mechanism. The second brush is installed on the fixed base and is used to contact the workpiece. The first brush and the second brush are respectively connected to the positive and negative poles of the pulse power supply.

[0011] Preferably, magnets are provided on the first brush and the second brush, the first brush and the second brush are magnetically attracted to the bed and the fixed base respectively, and the second brush is located between the turning tool on the tool holder and the mounting sleeve.

[0012] Preferably, the mounting sleeve comprises an mounting sleeve, an adjusting sleeve, a limiting ring and an end cover, the mounting sleeve being mounted on the fixed base, the adjusting sleeve being threadedly connected to one end of the mounting sleeve, and the end cover being mounted on the other end of the mounting sleeve, the mounting sleeve being provided with a T-shaped groove slidably connected to the floating base at one end of the mounting sleeve close to the adjusting sleeve, the T-shaped groove being inclined inwardly from the end close to the adjusting sleeve to the end away from the adjusting sleeve, the two ends of the floating base being respectively against the mounting sleeve and the limiting ring, the limiting ring being coaxially slidably arranged in the inner cavity of the mounting sleeve, the limiting ring being located between the floating base and the end cover, a first spring being provided between the limiting ring and the end cover, the two ends of the first spring being respectively against the limiting ring and the end cover, and under the elastic force of the first spring, the floating base can be moved along the T-shaped groove to approach or move away from the center of the mounting sleeve by twisting the adjusting sleeve to adjust the rolling diameter.

[0013] Preferably, the floating base is provided with a boss on the end surface close to the limiting ring, and the boss is located in the inner cavity of the limiting ring. When the rolling diameter is the largest, the boss abuts against the inner cylindrical surface of the limiting ring.

[0014] Preferably, an annular groove is provided on the inner cylindrical surface of the guide cylinder, a sealing ring is installed in the annular groove, the guide cylinder is sealed and connected to the rolling base via the sealing ring, a second spring is provided between the guide cylinder and the rolling base, the two ends of the second spring are respectively against the inner bottom surface of the guide cylinder and the steps on the rolling base; the guide cylinder is connected to the rolling end cover via threads.

[0015] Preferably, the outer cylindrical surface of the guide cylinder is provided with scale lines for cooperating with the end surface of the rolling base to display the rolling force.

[0016] Preferably, the outer port of each of the liquid guiding channels is threadedly connected to a coolant injection bayonet.

[0017] Preferably, the opening of one end of the floating base connected to the liquid conducting channel is larger than the port of the liquid conducting channel, so that the floating base is always connected to the liquid conducting channel during movement; the opening of one end of the floating base connected to the rolling base is equal to the size of the liquid conducting channel.

[0018] Preferably, the liquid outlet holes are evenly distributed on the end surface of the rolling end cover, and the axis of each liquid outlet hole has an angle with the central axis of the rolling end cover, so that the coolant can be directly sprayed to the rolling part through the liquid outlet holes.

[0019] The present invention also provides an electric pulse assisted cutting-rolling composite surface strengthening processing method, based on the above-mentioned electric pulse assisted cutting-rolling composite surface strengthening device, comprising the following steps:

[0020] (1) The workpiece to be rolled is passed through the inner cavity of the mounting sleeve, one end of the workpiece is clamped and fixed by the chuck mechanism, and the other end is positioned by the center; the machine tool is controlled to move the slide box, drive the turning tool and the rolling device to move, and move the turning tool and the ball bearing to the starting position of the workpiece processing;

[0021] (2) adjusting the rolling assembly to a suitable position according to process requirements;

[0022] (3) turning on the switch of the pulse power supply, and starting to inject coolant from the liquid guide channel, turning on the spindle of the machine tool, and performing turning and rolling, and continuously processing until the workpiece is processed;

[0023] (4) Turn off the rotation of the machine tool spindle, return the turning tool and the mounting sleeve to the vicinity of the center, and check the processing status;

[0024] (5) If the processing quality meets the requirements, turn off the pulse power supply and stop injecting coolant;

[0025] (6) Remove the workpiece, install the next workpiece, and repeat the above steps.

[0026] Compared with the prior art, the present invention has achieved the following technical effects:

[0027] The present invention is provided with a first brush and a second brush on the machine tool, so that a current loop is formed in the workpiece during the turning process. On the one hand, the electroplastic effect of the electric pulse can promote dislocation annihilation, accelerate the completion of dynamic recrystallization, reduce the hardness and strength of the workpiece, and improve the plasticity of the workpiece. On the other hand, the pulse current can form an electron flow between the tool-chip / workpiece friction pair, generate sliding electrical contact, reduce the friction coefficient between the friction pairs, and have a significant effect on improving the cutting performance of the workpiece material and improving the surface quality of the workpiece.

[0028] The present invention provides a rolling device on the machine tool, and the parts used for rolling are installed on the slide box through a fixed base, which has little effect on the turning process. The machine tool can perform electric pulse assisted turning and rolling at the same time, while improving production efficiency, because of the electric pulse assisted turning, an ultra-thick and ultra-fine grain metamorphic layer is formed on the surface of the workpiece, which reduces the critical strain of dynamic recrystallization in the rolling process, promotes dynamic recrystallization in the rolling process, further refines the grains, reduces dislocations, deepens the hardened layer on the surface of the rolled workpiece, and doubles the strengthening effect.

[0029] The present invention is provided with a cooling system, and the coolant is sprayed from the liquid outlet through the liquid guide channel and the coolant channel to the rolling part of the workpiece. The coolant absorbs and takes away the heat generated during the processing, which can effectively reduce the temperature of the workpiece and the tool, reduce thermal stress and thermal deformation, and thus improve the processing accuracy. Secondly, the coolant forms a lubricating film between the workpiece and the tool, which helps to reduce the friction coefficient of the rolling area and reduce the rolling force, thereby improving the processing quality and extending the tool life. At the same time, the shape and position of the coolant channel make the cooling system have little effect on turning and rolling.

[0030] The inner cavity of the mounting sleeve of the present invention is evenly distributed with multiple rolling assemblies, and the balls of each rolling assembly can roll the workpiece from multiple different positions at the same time. Compared with the traditional rolling method, this arrangement improves the rolling efficiency and rolling quality on the one hand, and avoids the deformation of parts due to uneven rolling force of one ball, thereby affecting the workpiece processing.

[0031] Furthermore, the inclined arrangement of the T-shaped groove in the inner cavity of the assembly sleeve of the present invention enables the rolling assembly to slide radially, thereby changing the rolling diameter, and can well adapt to the rolling process of workpieces with different diameters.

[0032] Furthermore, the opening of one end of the floating base of the present invention connected to the liquid guiding channel is larger than the port of the liquid guiding channel, so that the floating base is always connected to the liquid guiding channel during the movement. When the rolling device meets the rolling requirements of workpieces of different diameters, the normal operation of the cooling function is guaranteed at the same time.

[0033] Furthermore, the outer cylinder of the guide cylinder of the present invention is provided with scale lines for cooperating with the end face of the rolling base to display the rolling force, so that the rolling force can be monitored in real time during the rolling process, and the rolling diameter can be changed by adjusting the adjustment sleeve according to the process requirements, thereby achieving the purpose of controlling the rolling force. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0035] Figure 1 It is a schematic diagram of the overall structure of the electric pulse assisted cutting-rolling composite surface strengthening device in an embodiment of the present invention;

[0036] Figure 2 A partial cross-sectional view of an electric pulse assisted cutting-rolling composite surface strengthening device in an embodiment of the present invention;

[0037] Figure 3 A half-section view of a mounting sleeve in an embodiment of the present invention;

[0038] Figure 4 for Figure 3 A partial enlarged schematic diagram of part B;

[0039] Figure 5 It is a schematic diagram of the connection structure of the assembly set and the rolling assembly in the present invention;

[0040] Figure 6 A top view of an electric pulse assisted cutting-rolling composite surface strengthening device in an embodiment of the present invention;

[0041] Figure 7 for Figure 6 Side view along AA direction;

[0042] Figure 8 It is a structural schematic diagram of an assembly set in an embodiment of the present invention;

[0043] Fig. 9 It is a schematic structural diagram of a floating base in an embodiment of the present invention.

[0044] In the figure: 1-machine tool, 2-chuck mechanism, 3-tailstock mechanism, 4-slide box, 5-rolling device, 6-fixed base, 7-mounting sleeve, 8-rolling assembly, 9-top, 10-tool holder, 11-floating base, 12-rolling base, 13-guide cylinder, 14-rolling end cover, 15-ball, 16-workpiece, 17-liquid outlet hole, 18-liquid guide channel, 19-first brush, 20-second brush, 21-turning tool, 22-assembly set, 23-adjusting sleeve, 24-limiting ring, 25-end cover, 26-T-shaped groove, 27-first spring, 28-boss, 29-sealing ring, 30-second spring, 31-coolant injection bayonet, 32-first end opening, 33-second end opening, 34-through hole, 35-tightening screw. DETAILED DESCRIPTION

[0045] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0046] The purpose of the present invention is to provide an electric pulse assisted cutting-rolling composite surface strengthening device and processing method to solve the problems existing in the prior art. By introducing electric pulse treatment into the cutting process, the dislocation density on the surface of the cutting workpiece is reduced, the grains are greatly refined, and the thickness of the metamorphic layer is increased, the dynamic recrystallization of the rolling process is promoted, and a surface hardening layer with further refined grains and doubled thickness is formed on the surface of the workpiece during heat and mass transfer, the rolling effect is enhanced, and thermal stress and thermal deformation can be reduced during rolling, thereby improving the processing accuracy.

[0047] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0048] like Figure 1-Figure 9 As shown, this embodiment provides an electric pulse assisted cutting-rolling composite surface strengthening device, comprising a machine tool 1, wherein a chuck mechanism 2 and a tailstock mechanism 3 are respectively provided at the front and rear ends of the machine tool 1, and a slide box 4 is provided between the chuck mechanism 2 and the tailstock mechanism 3, wherein the chuck mechanism 2 is a three-jaw chuck, and further comprising a rolling device 5 and an electric pulse assisted turning device;

[0049] The rolling device 5 includes a fixed base 6, a mounting sleeve 7 and a rolling assembly 8. The fixed base 6 is mounted on the upper end of the slide box 4 by threaded fitting. The mounting sleeve 7 is mounted on the fixed base 6 by threaded fitting. The central axis of the mounting sleeve 7 is in line with the line connecting the center of the chuck mechanism 2 and the top 9 of the tailstock mechanism 3. The mounting sleeve 7 is located on the side of the tool holder 10 away from the chuck mechanism 2. The inner cavity of the mounting sleeve 7 is evenly provided with a plurality of rolling assemblies 8 along the circumferential direction. Specifically, three rolling assemblies 8 are provided in this embodiment.

[0050] The rolling assembly 8 includes a floating base 11, a rolling base 12, a guide cylinder 13 and a rolling end cover 14 which are connected in sequence. The floating base 11 is mounted in a groove in the inner cavity of the mounting sleeve 7. The rolling base 12 is coaxially matched with the guide cylinder 13. A spherical cavity is formed between the guide cylinder 13 and the rolling end cover 14. A ball 15 is mounted in the spherical cavity. The ball 15 protrudes outward from the rolling end cover 14 and is used to roll the workpiece 16. By evenly distributing the rolling assembly 8 in the circumferential direction, each ball 15 can apply the same rolling force to the workpiece 16, thereby improving the rolling quality. The floating base 11, the rolling base 12, the guide cylinder 13 and the rolling end cover 14 are connected to form a cooling liquid channel. A plurality of liquid outlet holes 17 are provided on the end surface of the rolling end cover 14. Specifically, in this embodiment, the number of the liquid outlet holes 17 is 4. The side wall of the mounting sleeve 7 is provided with liquid guide channels 18 corresponding to and connected with the cooling liquid channels of each rolling assembly 8. The cooling liquid is sprayed from the liquid outlet holes 17 to the rolling part of the workpiece 16 through the liquid guide channels 18 and the cooling liquid channels. The planes where the three liquid guide channels 18 are located are spaced 120° from each other.

[0051] The electric pulse assisted turning device includes a first brush 19 and a second brush 20. The first brush 19 is installed on the bed and contacts the chuck mechanism 2. The second brush 20 is installed on the fixed base 6 and is used to contact the workpiece 16. The first brush 19 and the second brush 20 are respectively connected to the positive and negative poles of the pulse power supply.

[0052] The present invention introduces electric pulse treatment into the cutting process, reduces the dislocation density on the surface of the cutting workpiece, greatly refines the grains, increases the thickness of the metamorphic layer, promotes dynamic recrystallization in the rolling process, and forms a workpiece surface hardening layer with further refined grains and doubled thickness on the workpiece surface during heat and mass transfer, thereby enhancing the rolling effect, absorbing and taking away the heat generated in the processing process through the coolant, effectively reducing the temperature of the workpiece and the tool, reducing thermal stress and thermal deformation, and thus improving the processing accuracy.

[0053] In this embodiment, magnets are provided on the first brush 19 and the second brush 20 . The first brush 19 and the second brush 20 are magnetically attracted to the bed and the fixed base 6 respectively. The second brush 20 is located between the turning tool 21 on the tool holder 10 and the mounting sleeve 7 .

[0054] In this embodiment, the mounting sleeve 7 includes an assembly sleeve 22, an adjustment sleeve 23, a limit ring 24 and an end cover 25. The assembly sleeve 22 is installed on the fixed base 6. The adjustment sleeve 23 is threadedly connected to one end of the assembly sleeve 22. The end cover 25 is installed at the other end of the assembly sleeve 22. The end of the assembly sleeve 22 close to the adjustment sleeve 23 is provided with a T-shaped groove 26 that is slidably connected to the floating base 11. The T-shaped groove 26 is inclined inwardly from the end close to the adjustment sleeve 23 to the end away from the adjustment sleeve 23. The two ends of the floating base 11 are respectively against the assembly sleeve 22 and the limit ring 24. The limit ring 24 is coaxially slidably arranged on the assembly sleeve The inner cavity of 22, the limiting ring 24 is located between the floating base 11 and the end cover 25, and a first spring 27 is provided between the limiting ring 24 and the end cover 25. The two ends of the first spring 27 are respectively against the limiting ring 24 and the end cover 25. The first spring 27 is coaxial with the limiting ring 24. Under the elastic force of the first spring 27, the floating base 11 can be moved along the T-shaped groove 26 to approach or move away from the center of the assembly sleeve 22 by twisting the adjusting sleeve 23 to adjust the rolling diameter. A fixing screw 35 is provided on the adjusting sleeve 23. After adjusting to the right position, the fixing screw 35 is tightened to lock the adjusting sleeve 23 on the assembly sleeve 22.

[0055] In this embodiment, a boss 28 is provided on the end surface of the floating base 11 close to the limiting ring 24. The boss 28 is located in the inner cavity of the limiting ring 24. When the rolling diameter is the largest, the boss 28 abuts against the inner cylindrical surface of the limiting ring 24. This can improve the reliability of the device and prevent the floating base 11 from falling out due to improper operation by the staff.

[0056] In this embodiment, an annular groove is provided on the inner cylindrical surface of the guide cylinder 13, and a sealing ring 29 is installed in the annular groove. The guide cylinder 13 is sealed and connected to the rolling base 12 through the sealing ring 29. A second spring 30 is provided between the guide cylinder 13 and the rolling base 12. The two ends of the second spring 30 are respectively against the inner bottom surface of the guide cylinder 13 and the steps on the rolling base 12; the guide cylinder 13 is connected to the rolling end cover 14 through threads.

[0057] In this embodiment, the outer cylindrical surface of the guide cylinder 13 is provided with scale lines for displaying the rolling force in cooperation with the end surface of the rolling base 12. The rolling force can be monitored in real time during the rolling process, and the rolling diameter can be changed by adjusting the adjustment sleeve 23 according to the process requirements, thereby achieving the purpose of controlling the rolling force.

[0058] In this embodiment, the outer port of each liquid guiding channel 18 is threadedly connected with a coolant injection bayonet 31 . Coolant is injected into the liquid guiding channel 18 through the coolant injection bayonet 31 .

[0059] In this embodiment, the opening of one end of the floating base 11 connected to the liquid guiding channel 18 (the first end opening 32) is larger than the port of the liquid guiding channel 18, so that the floating base 11 is always connected to the liquid guiding channel 18 during the movement, which can well adapt to the structure in which the floating base 11 changes the rolling diameter by moving in the groove; the opening of one end of the floating base 11 connected to the rolling base 12 (the second end opening 33) is equal to the size of the liquid guiding channel 18.

[0060] In this embodiment, a plurality of through holes 34 are evenly arranged on the end surface of the guide cylinder 13 close to the rolling end cover 14. Specifically, the number of the through holes 34 is 4. Through each of the through holes 34, it can be ensured that the coolant can flow from the guide cylinder 13 into the rolling end cover 14, and then flow normally to the workpiece 16 through the liquid outlet through hole 17.

[0061] In this embodiment, the liquid outlet holes 17 are evenly distributed on the end surface of the rolling end cover 14, and the axis of each liquid outlet hole 17 has an angle with the central axis of the rolling end cover 14, so that the coolant can be directly sprayed obliquely inward through the liquid outlet holes 17 to the rolling part.

[0062] An electric pulse assisted cutting-rolling composite surface strengthening processing method, based on the electric pulse assisted cutting-rolling composite surface strengthening device described above, comprises the following steps:

[0063] (1) The workpiece 16 to be rolled is passed through the inner cavity of the mounting sleeve 7, one end of the workpiece 16 is clamped and fixed by the chuck mechanism 2, and the other end is positioned by the center 9; the machine tool 1 is controlled to move the slide box 4, drive the turning tool 21 and the rolling device 5 to move, and move the turning tool 21 and the ball bearing 15 to the starting position of the processing of the workpiece 16;

[0064] (2) Rotate the adjustment sleeve 23 to a suitable position according to the process requirements and the reading on the guide cylinder 13, and tighten the set screw 35 to adjust the rolling assembly 8 to a suitable position;

[0065] (3) Turn on the pulse power switch, and start injecting coolant into the liquid guide channel 18 from the coolant injection port 31, start the machine tool spindle and the transmission screw, and perform turning and rolling, and continue processing until the workpiece 16 is processed;

[0066] (4) Turn off the rotation of the machine tool spindle, turn on the machine tool drive screw to reverse, return the turning tool 21 and the mounting sleeve 7 to the vicinity of the top 9, and check the processing status;

[0067] (5) If the processing quality meets the requirements, turn off the pulse power supply and stop injecting coolant;

[0068] (6) Remove the workpiece 16, install the next workpiece 16, and repeat the above steps.

[0069] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core ideas of the present invention. At the same time, for those skilled in the art, according to the ideas of the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. An electric pulse assisted cutting-rolling composite surface strengthening device, comprising a machine tool, wherein a chuck mechanism and a tailstock mechanism are respectively provided at the front and rear ends of the machine tool, and a slide box is provided between the chuck mechanism and the tailstock mechanism, characterized in that: Also included are rolling devices and electric pulse assisted turning devices; The rolling device comprises a fixed base, a mounting sleeve and a rolling assembly, wherein the fixed base is mounted on the upper end of the slide box, the mounting sleeve is mounted on the fixed base, the central axis of the mounting sleeve is colinear with the line connecting the center of the chuck mechanism and the top of the tailstock mechanism, the mounting sleeve is located on the side of the tool holder away from the chuck mechanism, and the inner cavity of the mounting sleeve is evenly provided with a plurality of the rolling assemblies along the circumferential direction; The rolling assembly comprises a floating base, a rolling base, a guide cylinder and a rolling end cover which are connected in sequence, the floating base being cooperatively mounted in a groove in the inner cavity of the mounting sleeve, a spherical cavity being formed between the guide cylinder and the rolling end cover, a ball being mounted in the spherical cavity, the ball protruding outward from the rolling end cover for rolling the workpiece, the floating base, the rolling base, the guide cylinder and the rolling end cover being internally connected to form a coolant channel, a plurality of liquid outlet holes are arranged on the end surface of the rolling end cover, a liquid guide channel which respectively corresponds to and is connected with the coolant channels of each rolling assembly is arranged in the side wall of the mounting sleeve, the coolant is sprayed from the liquid outlet holes to the rolling part of the workpiece through the liquid guide channel and the coolant channel; The electric pulse assisted turning device includes a first brush and a second brush. The first brush is installed on the bed and contacts the chuck mechanism. The second brush is installed on the fixed base and is used to contact the workpiece. The first brush and the second brush are respectively connected to the positive and negative poles of the pulse power supply.

2. The electric pulse assisted cutting-rolling composite surface strengthening device according to claim 1 is characterized in that: The first brush and the second brush are both provided with magnets. The first brush and the second brush are magnetically attracted to the bed and the fixed base respectively. The second brush is located between the turning tool on the tool holder and the mounting sleeve.

3. The electric pulse assisted cutting-rolling composite surface strengthening device according to claim 1 is characterized in that: The mounting sleeve comprises an mounting sleeve, an adjusting sleeve, a limiting ring and an end cover, the mounting sleeve being mounted on the fixed base, the adjusting sleeve being threadedly connected to one end of the mounting sleeve, and the end cover being mounted on the other end of the mounting sleeve, the mounting sleeve being provided with a T-shaped groove slidably connected to the floating base at one end of the mounting sleeve close to the adjusting sleeve, the T-shaped groove being inclined inwardly from the end close to the adjusting sleeve to the end away from the adjusting sleeve, the two ends of the floating base being respectively against the mounting sleeve and the limiting ring, the limiting ring being coaxially slidably arranged in the inner cavity of the mounting sleeve, the limiting ring being located between the floating base and the end cover, a first spring being provided between the limiting ring and the end cover, the two ends of the first spring being respectively against the limiting ring and the end cover, and under the elastic force of the first spring, the floating base can be moved along the T-shaped groove to approach or move away from the center of the mounting sleeve by twisting the adjusting sleeve to adjust the rolling diameter.

4. The electric pulse assisted cutting-rolling composite surface strengthening device according to claim 3 is characterized in that: The floating base is provided with a boss on the end surface close to the limiting ring. The boss is located in the inner cavity of the limiting ring. When the rolling diameter is the largest, the boss abuts against the inner cylindrical surface of the limiting ring.

5. The electric pulse assisted cutting-rolling composite surface strengthening device according to claim 1 is characterized in that: The inner cylindrical surface of the guide cylinder is provided with an annular groove, a sealing ring is installed in the annular groove, the guide cylinder is sealed and connected to the rolling base through the sealing ring, a second spring is provided between the guide cylinder and the rolling base, the two ends of the second spring are respectively against the inner bottom surface of the guide cylinder and the steps on the rolling base; the guide cylinder is connected to the rolling end cover by threads.

6. The electric pulse assisted cutting-rolling composite surface strengthening device according to claim 1 is characterized in that: The outer cylindrical surface of the guide cylinder is provided with scale lines for cooperating with the end surface of the rolling base to display the rolling force.

7. The electric pulse assisted cutting-rolling composite surface strengthening device according to claim 1 is characterized in that: The outer port of each liquid-conducting channel is threadedly connected with a coolant injection bayonet.

8. The electric pulse assisted cutting-rolling composite surface strengthening device according to claim 1 is characterized in that: The opening of one end of the floating base connected to the liquid guiding channel is larger than the port of the liquid guiding channel, so that the floating base is always connected to the liquid guiding channel during movement; the opening of one end of the floating base connected to the rolling base is equal to the size of the liquid guiding channel.

9. The electric pulse assisted cutting-rolling composite surface strengthening device according to claim 1, characterized in that: The liquid outlet holes are evenly distributed on the end surface of the rolling end cover, and the axis of each liquid outlet hole has an angle with the central axis of the rolling end cover, so that the coolant can be directly sprayed to the rolling part through the liquid outlet holes.

10. An electric pulse assisted cutting-rolling composite surface strengthening processing method, characterized in that: The electric pulse assisted cutting-rolling composite surface strengthening device according to any one of claims 1 to 9 comprises the following steps: (1) The workpiece to be rolled is passed through the inner cavity of the mounting sleeve, one end of the workpiece is clamped and fixed by the chuck mechanism, and the other end is positioned by the center; the machine tool is controlled to move the slide box, drive the turning tool and the rolling device to move, and move the turning tool and the ball bearing to the starting position of the workpiece processing; (2) adjusting the rolling assembly to a suitable position according to process requirements; (3) turning on the switch of the pulse power supply, and starting to inject coolant from the liquid guide channel, turning on the spindle of the machine tool, and performing turning and rolling, and continuously processing until the workpiece is processed; (4) Turn off the rotation of the machine tool spindle, return the turning tool and the mounting sleeve to the vicinity of the center, and check the processing status; (5) If the processing quality meets the requirements, turn off the pulse power supply and stop injecting coolant; (6) Remove the workpiece, install the next workpiece, and repeat the above steps.

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