Pure mechanical rotary punching linkage cutter handle for alternating superposition milling in-situ surface strengthening

Abstract

The invention relates to a pure mechanical rotary punching linkage cutter handle for alternating superposition milling in-situ surface strengthening. The pure mechanical rotary punching linkage cutter handle comprises a driving connecting assembly, a rotary punching vibration assembly, a connecting cutter assembly and an outer shell assembly. The spinning vibration assembly is coaxially arranged in the middle of the outer shell assembly. The driving connection assembly is connected to the top end of the rotary impact vibration assembly; the connecting cutter assembly is connected to the bottom end of the rotary impact vibration assembly. Impact vibration and milling technologies are fused, rotary impact composite milling machining under the low-frequency condition can be achieved, the overall structure is simple, operation is convenient and fast, and wide application prospects and market value are achieved.

Description

Technical Field

[0001] The invention relates to the technical field of mechanical processing, and in particular to a purely mechanical rotary punching linkage tool holder for alternating superposition milling in-situ surface strengthening. Background Art

[0002] In the field of mechanical processing, rotary impact is the introduction of reciprocating impact along the Z-axis direction on the basis of the traditional milling motion rotating around the Z-axis, and then the two motions are superimposed on each other. This alternating superposition processing method is adopted because under the coupling of the two motions, the microstructure on the surface of the workpiece will be induced to accumulate plastic deformation and gradually refine to form a multi-level micro-nano gradient structure. This multi-level micro-nano gradient structure has the characteristics of synergistic fusion of grain size gradient, dislocation density gradient and twin density gradient, and has excellent comprehensive mechanical properties. The generation of multi-level micro-nano gradient structure requires severe plastic deformation in the composite stress field, which is also the main reason why it is difficult to prepare multi-level micro-nano gradient structure on the surface by existing single methods.

[0003] Therefore, for the in-situ modification method of rotary impact milling, that is, achieving the modification purpose by relying on the material's own microstructure gradient refinement through in-situ stress superposition regulation during milling, the structural device aims to achieve the superimposed output effect of rotation and reciprocating impact motion through a single input of rotational motion.

[0004] At present, there are some forming equipment that can achieve the purpose of surface strengthening, such as shot peening, ultrasonic impact and laser impact, etc., but these are methods of first forming the surface metamorphic layer of milling and then processing, and they all have certain shortcomings. For example, the uniformity of shot peening is difficult to accurately control, and the poor surface roughness deteriorates the shot peening strengthening effect to a certain extent, especially the shot peening method is difficult to integrate with milling; the ultrasonic impact method is mainly used in weld strengthening processes that do not require high surface roughness and is mainly handheld. If the number of impacts and impact time are too high, pits will be generated, resulting in a larger surface roughness value. In addition, the ultrasonic impact device is complex and requires equipment such as ultrasonic generators, transducers, and amplitude transformers, which is not conducive to replacement on existing machine tools. If the surface metamorphic layer is to be avoided in the milling stage, and the surface multi-level micro-nano gradient structure is directly generated to obtain a strengthened surface, the processing process needs to strengthen the surface while milling. Summary of the invention

[0005] In view of the above problems, the purpose of the present invention is to provide a purely mechanical rotary-punching linkage tool holder for alternating superposition milling in-situ surface strengthening. By introducing an impact mechanism and optimizing the power transmission system, effective dispersion of cutting force and significant improvement of cutting efficiency can be achieved, while maintaining processing stability and precision.

[0006] The technical solution adopted by the present invention is as follows:

[0007] The present invention proposes a purely mechanical rotary punch linkage tool holder for in-situ surface strengthening by alternating superposition milling, comprising a drive connection assembly, a rotary punch vibration assembly, a connecting tool assembly and an external shell assembly; the rotary punch vibration assembly is coaxially arranged in the middle of the external shell assembly; the drive connection assembly is connected to the top end of the rotary punch vibration assembly; the connecting tool assembly is connected to the bottom end of the rotary punch vibration assembly.

[0008] Furthermore, the spin-impact vibration assembly includes a spline shaft, a rolling bearing, a cam, a ball, a roller seat, a return spring and a thrust needle roller bearing; the spline shaft is composed of an optical axis and a bearing platform coaxially arranged in the middle of the optical axis and an external spline coaxially arranged at the bottom of the optical axis; the top of the optical axis is coaxially fixed to the drive connection assembly; the inside of the roller seat is axially slidingly connected and radially engaged with the external spline at the bottom of the optical axis through a spline groove; the ball pair with balls evenly distributed around the circumference is connected to the upper end surface of the roller seat; the bottom of the roller seat is threadedly connected to the connecting tool assembly; the rolling bearing is transition-fitted on the outside of the bearing platform; the cam rotating pair is connected to the outside of the rolling bearing; the return spring is arranged on the outer surface of the lower half of the roller seat; the thrust needle roller bearing is arranged on the outside of the lower half of the roller seat and at the bottom of the return spring, and the thrust needle roller bearing is located inside the external housing assembly.

[0009] Furthermore, the roller seat is composed of two stepped cylinders, and the diameter of the upper cylinder is larger; the upper end surface of the upper cylinder is provided with four hemispherical grooves evenly distributed around the circumference for cooperating with the ball; the bottom of the lower cylinder is provided with an external thread.

[0010] Furthermore, the drive connection assembly includes a side-fixed tool handle and a rivet; the rivet is coaxially threadedly connected to the top of the side-fixed tool handle; and the bottom of the side-fixed tool handle is fixedly connected to the top of the optical axis.

[0011] Furthermore, the connecting tool assembly includes a nut and a chuck; the chuck is coaxially inserted into the bottom of the lower half of the cylinder of the roller seat; the nut is threadedly connected to the outside of the bottom of the lower half of the cylinder of the roller seat and fixes and limits the outer edge of the lower end face of the chuck.

[0012] Furthermore, the external shell assembly includes a shell and an external support; the shell is arranged on the outer side of the middle part of the spin-punch vibration assembly, and a contour groove is opened inside the shell for movement of the parts of the spin-punch vibration assembly; the external support is arranged outside the shell for fixing to the spindle chuck of the machine tool.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] The present invention aims to realize the rotary punching motion and link it with the machine tool through a purely mechanical principle and structure. The mechanical structure is more intuitive and controllable in working principle; it is simpler and more compact in operation and assembly; and it has more advantages in production and cost. On the other hand, due to the limited movement of the machine tool spindle, it is difficult to complete the superposition of periodic rotation and impact motions at the same time during the processing. The alternating superposition milling linkage tool holder designed in the present invention is easy to connect to the machine tool spindle component, making full use of the existing machine tool structural characteristics and having a high degree of integration with the machine tool. The superposition processing method of rotation and reciprocating impact motion provides a newer and more complex idea for surface strengthening. At the same time, the mechanical rotary punching structure design also lays the equipment foundation for the implementation and promotion of alternating superposition milling technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0016] Figure 2 for Figure 1 Schematic diagram of the structure of the mid-spin vibration assembly;

[0017] Figure 3 for Figure 1 A schematic diagram of the structure inside the middle shell;

[0018] Figure 4 for Figure 1 Schematic diagram of the structure viewed from above.

[0019] Among them, the figure markings are: 1-side-fixed tool handle; 2-pull nail; 3-spline shaft; 4-French rolling bearing; 5-cam; 6-ball; 7-roller seat; 8-reset spring; 9-thrust needle bearing; 10-nut; 11-chuck; 12-housing; 13-external support. DETAILED DESCRIPTION

[0020] 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 or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are 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.

[0021] It should be noted that, in the description of the present invention, the terms "up", "down", "top", "bottom", "one side", "the other side", "left", "right", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not mean that the device or element must have a specific orientation, be constructed and operated in a specific orientation.

[0022] See attached Figure 1-3The present embodiment proposes a purely mechanical rotary punch linkage tool holder for in-situ surface strengthening by alternating superposition milling, comprising a drive connection assembly, a rotary punch vibration assembly, a connecting tool assembly and an external shell assembly; the rotary punch vibration assembly is coaxially arranged in the middle of the external shell assembly; the drive connection assembly is connected to the top end of the rotary punch vibration assembly; the connecting tool assembly is connected to the bottom end of the rotary punch vibration assembly.

[0023] Among them, the driving connection component is connected to the machine tool spindle assembly to realize the input of speed torque, and is responsible for the linkage actuator and the external power source input connection, such as a machine tool or a robotic arm; the rotary impact vibration component is the core motion unit for realizing impact milling, and is responsible for generating axial reciprocating vibration under the premise of inputting rotational motion; the connecting tool component connects the tool in an ordinary way, and is responsible for the linkage actuator and the tool to realize processing; the external shell component is responsible for the limitation and constraint between the various parts, and is responsible for the internal limitation of the overall structure and the external fixing function.

[0024] like Figure 2 As shown, the spin-impact vibration assembly includes a spline shaft 3, a rolling bearing 4, a cam 5, a ball 6, a roller seat 7, a return spring 8 and a thrust needle bearing 9; wherein, the spline shaft 3 is composed of an optical axis and a bearing platform coaxially arranged in the middle of the optical axis and an external spline coaxially arranged at the bottom of the optical axis; the top of the optical axis is coaxially fixedly connected with the drive connection assembly; the inside of the roller seat 7 is axially slidably connected and radially engaged with the external spline at the bottom of the optical axis through a spline groove.

[0025] The roller seat 7 is composed of two stepped cylinders, and the upper cylinder has a larger diameter; the upper end surface of the upper cylinder is provided with four hemispherical grooves evenly distributed around the circumference for cooperating with the ball 6; the bottom of the lower cylinder is provided with an external thread.

[0026] The balls 6 are respectively connected to the hemispherical grooves on the upper end face of the upper cylinder of the roller seat 6 in corresponding ball pairs; the bottom of the lower cylinder of the roller seat 7 is threadedly connected to the connecting tool assembly; the rolling bearing 4 is transitionally fitted on the outside of the bearing platform; the cam 5 is connected to the outside of the optical axis through the rolling bearing 4 rotating pair, and the lower surface of the cam 5 is set as a curved surface that cooperates with the balls 6; the reset spring 8 is set on the outer surface of the lower cylinder of the roller seat 7; the thrust needle roller bearing 9 is set on the outside of the lower cylinder of the roller seat 7 and is located inside the shell 12; the two ends of the reset spring 8 are respectively against the lower end face of the upper cylinder of the roller seat 7 and the upper end face of the thrust needle roller bearing 9.

[0027] The drive connection assembly includes a side-fixed tool handle 1 and a rivet 2; the rivet 2 is coaxially threadedly connected to the top of the side-fixed tool handle 1; and the bottom of the side-fixed tool handle 1 is fixedly connected to the top of the optical axis.

[0028] The connecting tool assembly includes a nut 10 and a chuck 11; the chuck 11 is a truncated cone structure with a clamping hole at the axis center, that is, the outer surface is provided with a certain taper, and the small diameter end of the chuck 11 is coaxially inserted into the bottom of the lower cylinder of the roller seat 7; the nut 10 is threadedly connected to the outer bottom of the lower cylinder of the roller seat 7 and fixes the outer edge of the lower end surface of the chuck 11; after the chuck 11 is plugged into the roller seat 7, the chuck 11 and the roller seat 7 can be further locked by screwing the nut 10 to prevent the chuck 11 from falling off.

[0029] The external housing assembly includes a housing 12 and an external support 13; the housing 12 is arranged outside the middle of the spin-punch vibration assembly; the housing 12 contains the spin-punch vibration assembly inside, and provides the movement space required by the internal parts by opening a contour groove inside. At the same time, the housing 12 is composed of two identical front and rear parts, and the two parts can be fixed in all directions by external bolts. The external support 13 is fixedly connected to the outside of the housing 12 and is fixed between the fixing pin and the machine tool spindle chuck.

[0030] During specific operation, the machine tool spindle is connected to the input rotation speed around the Z axis through the side-fixed tool holder 1. The side-fixed tool holder 1 drives the spline shaft 3 to rotate independently synchronously; the outer ring of the rolling bearing 4 is fixed to the cam 5, and the inner ring rotates synchronously with the spline shaft 3; the roller seat 7 is connected to the spline shaft 3 through the inner and outer splines, and reciprocates up and down along the Z axis while rotating; the ball 6 on the roller seat 7 is always in contact with the curved surface of the lower surface of the cam 5, and the ball 6 rotates freely in the groove; the reset spring 8 is compressed while rotating with the rotation impact of the roller seat 7; the inner ring of the thrust needle roller bearing 9 is compressed with the reset spring 8 It rotates with the roller seat 7, and the outer ring is installed at the bottom of the internal groove of the shell 12; the external external support 13 is responsible for connecting the shell 12 with the stationary chuck at the upper end of the machine tool spindle to make the shell 12 and the external support 13 fixed; the nut 10 and the chuck 11 are connected and installed with the roller seat 7 through the hole at the lower end of the roller seat 7 and the thread on the outer surface, and perform rotary impact motion synchronously during movement; finally, the tool is clamped in the chuck 11 and performs rotary impact motion with the roller seat 7, thereby achieving a processing effect of superposition of rotation and impact.

[0031] Matters not described in detail in the present invention are all known technologies.

[0032] The embodiments described above are merely descriptions of preferred implementation modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A purely mechanical rotary punching linkage tool holder for alternating superposition milling in-situ surface strengthening, characterized by: It includes a driving connection component, a rotary vibration component, a connecting tool component and an external shell component; the rotary vibration component is coaxially arranged in the middle of the external shell component; the driving connection component is connected to the top end of the rotary vibration component; and the connecting tool component is connected to the bottom end of the rotary vibration component.

2. According to claim 1, a purely mechanical rotary punching linkage tool holder for in-situ surface strengthening by alternating superposition milling, characterized in that: The rotary impact vibration component includes a spline shaft, a rolling bearing, a cam, a ball, a roller seat, a return spring and a thrust needle roller bearing; the spline shaft is composed of an optical axis and a bearing platform coaxially arranged in the middle of the optical axis and an external spline coaxially arranged at the bottom of the optical axis; the top of the optical axis is coaxially fixed to the drive connection component; the inside of the roller seat is axially slidingly connected and radially engaged with the external spline at the bottom of the optical axis through a spline groove; the ball pair with balls evenly distributed around the circumference is connected to the upper end surface of the roller seat; the bottom of the roller seat is threadedly connected to the connecting tool assembly; the rolling bearing is transitionally fitted on the outside of the bearing platform; the cam rotating pair is connected to the outside of the rolling bearing; the return spring is arranged on the outer surface of the lower half of the roller seat; the thrust needle roller bearing is arranged on the outside of the lower half of the roller seat and at the bottom of the return spring, and the thrust needle roller bearing is located inside the external housing assembly.

3. The purely mechanical rotary punching linkage tool holder for alternating superposition milling in-situ surface strengthening according to claim 2, characterized in that: The roller seat is composed of two stepped cylinders, and the upper cylinder has a larger diameter; the upper end surface of the upper cylinder is provided with four hemispherical grooves evenly distributed around the circumference for matching with the ball; the bottom of the lower cylinder is provided with an external thread.

4. The purely mechanical rotary punching linkage tool holder for alternating superposition milling in-situ surface strengthening according to claim 2, characterized in that: The drive connection assembly comprises a side-fixed tool handle and a rivet; the rivet is coaxially threadedly connected to the top of the side-fixed tool handle; and the bottom of the side-fixed tool handle is fixedly connected to the top of the optical axis.

5. The purely mechanical rotary punching linkage tool holder for alternating superposition milling in-situ surface strengthening according to claim 3, characterized in that: The connecting tool assembly includes a nut and a chuck; the chuck is coaxially inserted into the bottom of the cylinder in the lower half of the roller seat; the nut is threadedly connected to the outside of the bottom of the cylinder in the lower half of the roller seat and fixes and limits the outer edge of the lower end surface of the chuck.

6. The purely mechanical rotary punching linkage tool holder for alternating superposition milling in-situ surface strengthening according to claim 2, characterized in that: The external shell assembly includes a shell and an external support; the shell is arranged on the outside of the middle part of the spin-punch vibration assembly, and a contour groove is opened inside the shell for the movement of the parts of the spin-punch vibration assembly; the external support is arranged outside the shell and is used to be fixed to the spindle chuck of the machine tool.

Images