Milling device and milling method

Abstract

The present invention provides a milling device for milling a planar metal component, comprising: a milling machine, an ultrasonic control table, and a control system; the ultrasonic control table is mounted on the table of the milling machine, and the metal component is fixed on the upper end surface of the ultrasonic control table; the ultrasonic control table is equipped with a first number of ultrasonic probes, and the coupling surface of each ultrasonic probe is at a height equivalent to the upper end surface of the ultrasonic control table; the control system is used to control the milling cutter of the milling machine to perform milling processing on the metal component from above, and at the same time, according to the position of the milling cutter, control each ultrasonic probe to perform stress control on the metal component from below using corresponding power. The present invention also provides a milling method using the device accordingly. The technical solution of the present invention reduces the deformation of the planar metal component, improves its processing efficiency and extends its conformal period by using corresponding power to perform ultrasonic control on different areas of the planar metal component during the milling process.

Description

Technical Field

[0001] The invention belongs to the field of metal processing, and in particular relates to a milling device and a milling method. Background Art

[0002] Thin-walled metal components are widely used in aerospace, national defense weapons, nuclear power equipment, automobile manufacturing and other fields due to their light weight and compact structure. For example, large frames, thin-walled wall panel structures, small blades, etc. made of aluminum alloy and titanium alloy materials are mainly processed by milling.

[0003] Since thin-walled parts have the characteristics of high machining removal rate and gradually reduced workpiece stiffness during the forming process, the milling force, the unevenly distributed residual stress in the component, and the clamping force of the fixed tooling during the milling process cause large deformation, making it difficult to ensure the machining accuracy. And after processing, the residual stress inside the component is redistributed, and the release of residual stress leads to secondary deformation of the component, which seriously affects the subsequent processing and service conformal ability. Therefore, a device is needed to control the initial residual stress distribution level in the component before milling, reduce the milling force and clamping force during the milling process, and eliminate the milling residual stress in real time to control the deformation of the thin-walled metal flat plate component.

[0004] Existing milling deformation control technologies often combine numerical simulation calculations and multiple processing of small specimens to optimize milling parameters. By adjusting process parameters such as tool speed, feed rate, and milling depth, the milling force, milling temperature, and residual stress distribution are controlled to control deformation.

[0005] For the milling process of thin-walled metal components, traditional mechanical processing technology has the disadvantages of unstable processing quality, low production efficiency, and concentrated cutting stress. The ultrasonic assisted processing technology developed on this basis is to apply ultrasonic frequency vibration to the tool on the basis of ordinary mechanical processing, so as to achieve high-frequency intermittent cutting, which has a certain effect of improving processing accuracy. The invention patent with application number 202011458629.2 discloses an ultrasonic assisted milling method for difficult-to-process composite materials TiB2 / 7050Al, which increases the surface residual compressive stress by applying periodic high-frequency and low-amplitude vibrations along the axial direction on the machine tool spindle. The invention patent with application number 201910431201.X discloses a residual stress reduction tooling, which is used to be embedded in the machine tool. During the milling process, a high-energy acoustic wave exciter is used to reduce residual stress to achieve the purpose of reducing deformation.

[0006] However, thin-walled parts of different sizes and structures require different milling process parameters and design features to fix the fixture structure in order to better control the milling force, milling temperature and residual stress distribution after milling. The influence of the unevenly distributed residual stress in the blank before milling on the subsequent milling process and the secondary deformation caused by the release of residual stress after milling are not considered. The ultrasonic assisted milling method is mainly aimed at reducing the milling force and the peak value of residual stress after milling, and it also fails to optimize the fixture clamping force. Summary of the invention

[0007] In view of this, an embodiment of the present invention provides a milling device for milling a planar metal component, comprising: a milling machine, an ultrasonic control console, and a control system; the ultrasonic control console is mounted on the table of the milling machine, and the metal component is fixed on the upper end surface of the ultrasonic control console; the ultrasonic control console is equipped with a first number of ultrasonic probes, and the coupling surface of each ultrasonic probe is at the same height as the upper end surface of the ultrasonic control console; the control system is used to control the milling cutter of the milling machine to perform milling processing on the metal component from above, and at the same time, according to the position of the milling cutter, control each ultrasonic probe to perform stress regulation on the metal component from below using corresponding power. The embodiment of the present invention also provides a milling method using the device accordingly. The technical solution of the embodiment of the present invention reduces the deformation of the planar metal component, improves its processing efficiency and extends its conformal period by using corresponding power to perform ultrasonic regulation on different areas of the planar metal component during the milling process.

[0008] In a first aspect, an embodiment of the present invention provides a milling device for milling planar metal components, comprising: a milling machine, an ultrasonic control console, and a control system; the ultrasonic control console is mounted on the table of the milling machine, and the metal component is fixed on the upper end surface of the ultrasonic control console; the ultrasonic control console is equipped with a first number of ultrasonic probes, and the coupling surface of each ultrasonic probe is at a height equivalent to the upper end surface of the ultrasonic control console; the control system is used to control the milling cutter of the milling machine to perform milling processing on the metal component from above, and at the same time, control each ultrasonic probe from below to perform stress regulation on the metal component using corresponding power according to the position of the milling cutter.

[0009] As described above, the above device is used to perform ultrasonic regulation on different areas of the planar metal component using corresponding power during the milling process, thereby reducing the deformation of the planar metal component, improving its processing efficiency and extending its conformal period.

[0010] In a possible implementation of the first aspect, the ultrasonic control console is a box-like structure without a bottom, and a second number of first through holes passing through the top of the box-like structure are provided, and the second number is greater than the first number; each of the ultrasonic probes passes through a first through hole to couple with the metal component and is fixed on an assembly surface of the ultrasonic control console, and the assembly surface is the inner surface of the box-like structure facing downward from the top.

[0011] As described above, through the above device, ultrasonic probes are set in a number of first through holes according to the area to be processed or to be regulated of the metal component, and are evenly distributed in the area to be processed or to be regulated of the metal component, thereby improving the stress regulation effect.

[0012] In a possible implementation of the first aspect, the ultrasonic control platform is further equipped with a third number of vacuum suction cups for fixing the metal component by adsorption, each vacuum suction cup passes through a first through hole and is fixed on the assembly surface of the ultrasonic control platform, and the sum of the third number and the first number is equal to or less than the second number; the control system is further used to control the vacuum suction cup to produce an adsorption effect. In some embodiments, the vacuum suction cup and the ultrasonic probe can be interchanged.

[0013] As described above, through the above device, vacuum suction cups are arranged at a number of first through holes according to the area to be processed or adjusted of the metal component, so that the metal component is evenly fixed on the ultrasonic adjustment table, thereby improving the fixing effect of the metal component.

[0014] In a possible implementation of the first aspect, each ultrasonic probe includes an ultrasonic transducer, a sleeve, a flange, a fourth number of plug bolts and a fourth number of springs; the sleeve is fixed on the assembly surface, sleeved on the outside of the ultrasonic transducer and the flange, the ultrasonic transducer passes through and is fixed on the flange, the flange is tightened from the bottom by the spring and fits the assembly surface; a fourth number of second through holes are set at the bottom of the sleeve, and a fourth number of third threaded holes are set on the periphery of the flange, each of the plug bolts passes through a corresponding second through hole of the sleeve and a third threaded hole of the spring flange in sequence from bottom to top, and is fixed to the flange by threads; the coupling surface of the ultrasonic transducer passes through a corresponding first through hole to couple with the metal component.

[0015] From the above, a spring is arranged between the sleeve and the flange of the ultrasonic probe through the above device to control the tight coupling between the ultrasonic transducer and the metal component, so as to improve the effect of ultrasonic regulation and avoid damage to the ultrasonic transducer due to too tight fit.

[0016] In a possible implementation of the first aspect, an outward extension is provided at the lower portion of two mutually parallel sides of the ultrasonic control platform, and a plurality of strip grooves are provided in the extension for accommodating fixing components so as to assemble the ultrasonic control platform on the table top of the milling machine.

[0017] From the above, the fixing components are arranged in the strip grooves through the above device to assemble the ultrasonic control table on the table of the milling machine.

[0018] In a possible implementation manner of the first aspect, crisscross inverted T-shaped grooves are provided on the top of the ultrasonic control console for placing pressure strips to fix the metal component.

[0019] From the above, a pressure strip is placed in the inverted T-shaped groove through the above device to fix the metal component on the ultrasonic control console.

[0020] In a possible implementation of the first aspect, it also includes a vacuum suction cup driving device, which includes: a vacuum air pump, a vacuum electric air valve and a vacuum air pipe; the vacuum air pump is connected to the vacuum suction cup through the vacuum electric air valve and the vacuum air pipe; the vacuum electric air valve is used to receive a signal from the control system and open or close the air path between the vacuum air pump and the vacuum suction cup accordingly.

[0021] As described above, the vacuum electric air valve is used to open or close the air path between the vacuum air pump and the vacuum suction cup through the above device, so as to open or close the adsorption function of the vacuum suction cup.

[0022] In a possible implementation manner of the first aspect, the method further includes: a stress analyzer, configured to detect the stress of the metal component through the ultrasonic probe.

[0023] From the above, the stress of the metal component is detected by the stress analyzer through the above device, so as to facilitate ultrasonic regulation before and after milling.

[0024] In a second aspect, an embodiment of the present invention provides a milling method, which uses any device described in the first aspect to perform milling processing on a planar metal component, including: while using a milling cutter to mill the metal component on the upper plane of the metal component, using a plurality of ultrasonic probes to ultrasonically control the metal component on the lower plane of the metal component; wherein different ultrasonic powers are used to perform ultrasonic control on the area of ​​the metal component that is being milled, the area that has completed milling, and the area that has not been milled.

[0025] As described above, the above method is used to reduce the deformation of the planar metal component, improve its processing efficiency and extend its conformal period by using corresponding power to perform ultrasonic regulation on different areas of the planar metal component during the milling process.

[0026] In a possible implementation of the second aspect, it also includes: before performing the ultrasonic milling, using the ultrasonic probe to perform stress analysis on the metal component, and when there is an area where the stress is greater than a set threshold, the ultrasonic probe is used to perform stress regulation on the area; and / or after performing the ultrasonic milling, using the ultrasonic probe to perform stress analysis on the metal component, and when there is an area where the stress is greater than the set threshold, the ultrasonic probe is used to perform stress regulation on the area.

[0027] From the above, the stress of the metal component is detected by using the stress analyzer through the above method, so as to facilitate ultrasonic regulation before and after milling. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a structural schematic diagram of a milling device embodiment of the present invention;

[0029] Figure 2A A schematic diagram of the three-dimensional structure of an ultrasonic control console of a milling device embodiment of the present invention;

[0030] Figure 2B A schematic bottom view of an ultrasonic control console of a milling device embodiment of the present invention;

[0031] Figure 2C A schematic top view of an ultrasonic control console of a milling device embodiment of the present invention;

[0032] Figure 2D It is a schematic diagram of a front view and a left view of an ultrasonic control console of an embodiment of a milling device of the present invention;

[0033] Figure 3 A schematic cross-sectional structure diagram of an ultrasonic probe of a milling device embodiment of the present invention;

[0034] Figure 4 A schematic diagram of the structure of a control system of a milling device embodiment of the present invention;

[0035] Figure 5 A schematic diagram of a process of a milling method embodiment of the present invention;

[0036] Figure 6 Schematic diagram of the power relationship of ultrasonic transducers at different positions in a milling method embodiment of the present invention.

[0037] Description of Figure Numbers:

[0038] Milling machine 100, milling cutter 110;

[0039] Ultrasonic control table 200, control surface 201, assembly surface 202, through hole 203, strip groove 2011, inverted T-shaped groove 2012, hanging hole 2013, threaded hole 2021, fixing hole 2022, pipe hole 2031, strip hole 2032;

[0040] Ultrasonic probe 210, ultrasonic transducer 211, sleeve 212, flange 213, plug bolt 214, spring 215;

[0041] Vacuum suction cup 220, vacuum suction cup driving device 222;

[0042] Control system 300, milling machine control system 310, ultrasonic control system 320;

[0043] Planar metal component 400. DETAILED DESCRIPTION

[0044] In the following description, reference is made to “some embodiments”, which describe a subset of all possible embodiments, but it will be understood that “some embodiments” may be the same subset or different subsets of all possible embodiments and may be combined with each other without conflict.

[0045] In the following description, the terms "first\second\third, etc." or module A, module B, module C, etc. are only used to distinguish similar objects, or to distinguish different embodiments, and do not represent a specific ordering of the objects. It can be understood that the specific order or sequence can be interchanged where permitted, so that the embodiments of the present invention described here can be implemented in an order other than that illustrated or described here.

[0046] In the following description, the numbers representing the steps, such as S110, S120, etc., do not necessarily mean that the steps must be executed in this manner. If permitted, the order of the previous and next steps can be interchanged, or they can be executed simultaneously.

[0047] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which the present invention belongs. The terms used herein are only for the purpose of describing the embodiments of the present invention and are not intended to limit the present invention.

[0048] The embodiment of the present invention provides a milling device for milling a planar metal component, comprising: a milling machine, an ultrasonic control table, and a control system; the ultrasonic control table is mounted on the table of the milling machine, and the metal component is fixed on the upper end surface of the ultrasonic control table; the ultrasonic control table is equipped with a first number of ultrasonic probes, and the coupling surface of each ultrasonic probe is at the same height as the upper end surface of the ultrasonic control table; the control system is used to control the milling cutter of the milling machine to perform milling processing on the metal component from above, and at the same time, according to the position of the milling cutter, control each ultrasonic probe to perform stress regulation on the metal component from below using corresponding power. The embodiment of the present invention also provides a milling method using the device accordingly. The technical solution of the embodiment of the present invention reduces the deformation of the planar metal component, improves its processing efficiency and extends its conformal period by using corresponding power to perform ultrasonic regulation on different areas of the planar metal component during the milling process.

[0049] Combine the following Figures 1 to 6 Various embodiments of the present invention are introduced.

[0050] Let's combine Figure 1A milling device embodiment of the present invention is introduced.

[0051] In an embodiment of a milling device, it includes: a milling machine, an ultrasonic control table, and a control system; the ultrasonic control table is installed on the table top of the milling machine, and the metal component is fixed on the upper end surface of the ultrasonic control table; the ultrasonic control table is equipped with a first number of ultrasonic probes, and the coupling surface of each ultrasonic probe is at a height equivalent to the upper end surface of the ultrasonic control table; the control system is used to control the milling cutter of the milling machine to perform milling processing on the metal component from above, and at the same time, control each ultrasonic probe from below to perform stress regulation on the metal component using corresponding power according to the position of the milling cutter.

[0052] Figure 1 The structure of an embodiment of a milling device is shown, which includes a milling machine 100 , an ultrasonic control console 200 , and a control system 300 , and performs milling processing on a metal component 400 .

[0053] The metal component 400 is a large-scale planar thin-walled structure, which is fixed on the control surface 201 of the ultrasonic control table 200 , and the ultrasonic control table 200 is assembled on the table of the milling machine 100 .

[0054] The ultrasonic control platform 200 is equipped with a first number of ultrasonic probes 210, and the coupling surface height of each ultrasonic probe is equivalent to the control surface 201 of the ultrasonic control platform 200, and the ultrasonic stress of the metal component 400 is controlled from the bottom of the metal component 400. The ultrasonic vibration emitted by the ultrasonic probe 210 has an acoustic softening effect, and the stress of the metal component 400 is controlled, including averaging and / or eliminating.

[0055] For example, Figure 1 Three ultrasound probes 210 are shown in the figure. In actual scenarios, other numbers of ultrasound probes 210 can be set according to actual scenarios.

[0056] The milling cutter 110 of the milling machine 100 is controlled to be disposed above the metal component 400 to perform milling processing on the metal component 400 .

[0057] The control system 300 is used to control the milling cutter 110 of the milling machine 100 to mill the planar metal component 400 from above, and at the same time control each ultrasonic probe to use corresponding power to perform stress regulation on the metal component 400 from below according to the position of the milling cutter.

[0058] Different powers are used for stress equalization in the area that has been milled, the area that is being milled, and the area that has not been milled, respectively, to reduce the milling force and milling heat during the milling process. For example, the ultrasonic probe 210 below the area below the milling cutter, that is, below the area that is being milled, is in a high-power output state, the ultrasonic probe 210 below the area that has been milled is in a medium-power output state, and the transducer below the area that has not been milled is in a low-power output state.

[0059] As described above, the milling process is performed on the metal component through the above device, and stress regulation is performed on the bottom of the metal component at the same time, so as to reduce the deformation of the metal component caused by milling.

[0060] Furthermore, in some embodiments, the ultrasound control console 200 is a box-like structure without a bottom. Figure 2A The stereoscopic view of the ultrasonic control station 200 shown in FIG. 1 is a perspective view of the ultrasonic control station 200, wherein the upper surface of the top of the box is the upper end surface of the ultrasonic control station 200. Figure 2C The control surface 201 (hereinafter referred to as the control surface 201) shown in FIG. 1 is provided with a metal member 400; the lower surface of the top of the box is the control surface of the ultrasonic control platform 200, that is, Figure 2B The assembly surface 202 shown in the figure is used to assemble the ultrasonic probe 210; the middle of the box is an assembly space. An extension is provided outwardly at the bottom of a pair of parallel sides to install a fixing tool to fix the ultrasonic control console 200.

[0061] Figure 2B The bottom view of the ultrasonic control console 200 is shown, that is, the assembly surface 202 of the ultrasonic control console 200 . The assembly surface 202 is the inner surface of the box-shaped structure of the ultrasonic control console 200 with the top facing downward.

[0062] Among them, the through hole 203 is a through hole that passes through the top of the box-like structure set on the ultrasonic control console 200, and there are a second number of through holes 203, and the second number is greater than the first number; the ultrasonic probe 210 is installed in the through holes of the first number, and the vacuum suction cup 220 is installed in the through holes of the third number, and the sum of the third number and the first number is equal to or less than the second number.

[0063] Each ultrasonic probe 210 passes through a through hole 203 to couple with the metal component 400 and is fixed on the assembly surface 202 of the ultrasonic control console 200 .

[0064] Each vacuum suction cup 220 passes through a through hole 203 and is fixed on the assembly surface 202 of the ultrasonic control console, so as to fix the metal component 400 by adsorption.

[0065] Among them, six fixing holes 2022 are arranged in each through hole 203 to form a circle, and eight threaded holes 2021 are arranged outside the circle. The fixing holes 2022 and the threaded holes 2021 are used to fix the ultrasonic probe 210 or the vacuum suction cup 220, which will be described in detail later.

[0066] Furthermore, in some embodiments, the ultrasonic probe 210 and the vacuum chuck 220 are interchangeable, and the positions of the ultrasonic probe 210 and the vacuum chuck 220 can be arranged according to the size characteristics of the component, the milling process path, and the finite element simulation results. According to the deformation control target, the residual stress concentration position before / after milling and the position with uneven stress distribution are subjected to residual stress reduction treatment, and the easily deformed position during the ultrasonic milling process is stimulated.

[0067] From the above, through the above device, the position and number of ultrasonic probes and the position and number of vacuum suction cups are set according to the processing area or stress adjustment area of ​​the metal component, so as to better fix the metal component and evenly adjust the stress in the processing area or stress adjustment area to reduce the deformation of the metal component.

[0068] Figure 2C A top view of the ultrasonic control platform 200 , that is, a control surface 201 of the ultrasonic control platform 200 is shown.

[0069] The inverted T-shaped grooves 2012 are crisscrossed inverted T-shaped grooves arranged on the control surface 201 of the ultrasonic control console 200 , and pressure strips are placed in the inverted T-shaped grooves 2012 not covered by the metal component 400 to increase the fixation of the metal component 400 .

[0070] Among them, the strip groove 2011 is a strip groove on the lower outward extension of two mutually parallel side surfaces (i.e., the main view display surface) of the ultrasonic control table 200, which is used to place fixing components to assemble the ultrasonic control table 200 on the table top of the milling machine 100.

[0071] The hoisting hole 2013 is used to hoist the ultrasonic control table 200 to the middle of the table top of the milling machine 100 .

[0072] Figure 2D The front view and the left view of the ultrasonic control console 200 are shown. In particular, tube holes 2031 are provided on the two side surfaces parallel to the left view for passing the power cord of the ultrasonic probe 210, and strip holes 2032 are provided on the two side surfaces parallel to the front view for passing the air tube of the vacuum suction cup 220.

[0073] Further, in some embodiments, each ultrasonic probe 210 includes an ultrasonic transducer, a sleeve, a flange, a fourth number of plug bolts, and a fourth number of springs. Figure 3The cross-sectional structure of the ultrasonic probe 210 is shown, including an ultrasonic transducer 211 , a sleeve 212 , a flange 213 , a fourth number of driving bolts 214 and a fourth number of springs 215 .

[0074] The sleeve 212 is secured by bolts and glue. Figure 2B The middle threaded hole 2021 is fixed on the assembly surface 202 of the ultrasonic control console 200 and covers the ultrasonic transducer 211 and the flange 213 of the ultrasonic probe 210 from the bottom.

[0075] The bottom of each sleeve 212 is provided with a fourth number of mounting holes and the edge of each flange 213 is provided with a fourth number of threaded holes. Each plug bolt 214 of an ultrasonic probe 210 sequentially passes through a corresponding mounting hole of the sleeve 212 of the ultrasonic probe 210, a spring 215 and a corresponding threaded hole of the flange 213 from bottom to top, and is fixed on the flange 213 and inserted into Figure 2B The fixing hole 2022 is used to fix the position.

[0076] Among them, during the ultrasonic regulation of residual stress and ultrasonic milling, the metal component 400 is deformed due to the effect of stress release, which may cause a gap between the coupling surface of the ultrasonic transducer 211 and the metal component 400, resulting in the inability to continue to input energy and reduce the regulation effect. Therefore, during assembly, the coupling surface of the ultrasonic transducer 211 is slightly higher than the regulation surface of the ultrasonic control station 100. Under the action of the suction force of the vacuum suction cup 220 and the pressure of the clamping tooling, the metal plate will press the coupling surface of the ultrasonic transducer 211 to the same height as the regulation surface of the ultrasonic control station 200. The spring 215 on the plug bolt 214 is compressed to provide a tightening force to the ultrasonic transducer 211, so that the coupling surface of the ultrasonic transducer 211 is always in close contact with the metal component 400. According to the test, an appropriate tightening force is selected, and the tightening force can be adjusted by adjusting the position of the coupling surface of the ultrasonic transducer 211, changing the spring, adding a gasket, etc.

[0077] From the above, through the above structure, the fitting degree between the coupling surface of the ultrasonic transducer and the metal component is automatically adjusted by the spring during the ultrasonic regulation process, which not only improves the ultrasonic coupling degree between the ultrasonic transducer and the metal component during milling, reduces energy loss, improves the ultrasonic regulation effect, but also protects the ultrasonic transducer from damage caused by deformation of the metal component.

[0078] Furthermore, in some embodiments, each vacuum cup 220 also has a corresponding sleeve and flange, and the sleeve is Figure 2B The threaded hole 2021 of the flange is fixed on the assembly surface 202 of the ultrasonic control console 200. Figure 2B The fixing hole 2022 is used to fix the position.

[0079] Furthermore, in some embodiments, a vacuum suction cup driving device is also included, and the driving device includes: a vacuum air pump, a vacuum electric air valve and a vacuum air pipe. The vacuum air pump is connected to the vacuum suction cup 220 through the vacuum electric air valve and the vacuum air pipe; the vacuum electric air valve is used to open or close the air path between the vacuum air pump and the vacuum suction cup to open or close the adsorption function of the vacuum suction cup.

[0080] Furthermore, in some embodiments, the control system 300 includes Figure 4 A milling machine control system 310 and an ultrasonic control system 320 are shown.

[0081] The milling machine control system 310 is a machine tool CNC system, which is used to control the milling cutter 110 of the milling machine 100 to perform milling processing, and directly transmit the real-time position information of the milling cutter 110 to the ultrasonic control system 320 or transmit the ultrasonic control system 320 through the host computer.

[0082] The ultrasonic control system 320 is used to control the stress adjustment power of each ultrasonic probe 210 according to the real-time position of the milling cutter 110. For example, the output power and working time of each ultrasonic transducer and the relationship between these parameters and the real-time position of the milling cutter 110 are pre-written or programmed in the ultrasonic control system 320. The ultrasonic control system 320 is also used to control the vacuum suction cup driving device 222 to enable the vacuum suction cup 220 to turn on and off the adsorption function.

[0083] Furthermore, in some embodiments, a stress analyzer is further included, which is used to detect the stress of the metal component 400 through the ultrasonic probe 210. The stress of the metal component 400 is regulated according to the stress detection result.

[0084] In the ultrasonic milling process and in the residual stress regulation, the ultrasonic transducer 211 uses different working parameters respectively. For example, in the residual stress reduction and homogenization: the ultrasonic excitation frequency is 5KHz-50KHz, the output power of the high-energy sound wave is 10-400W, the single high-energy sound beam injection time is 10-30min, and the front end face radius of the ultrasonic transducer 211 is between 20-80mm. In the ultrasonic milling process: the ultrasonic excitation frequency is 5KHz-40KHz, the output power of the high-energy sound wave is 10-400W, and the front end face radius of the ultrasonic transducer 211 is between 20-80mm

[0085] In summary, in an embodiment of a milling device, an ultrasonic control platform is mounted on the table of a milling machine, and a metal component is fixed on the control surface of the ultrasonic control platform; the ultrasonic control platform is equipped with a first number of ultrasonic probes, and the coupling surface of each ultrasonic probe is at a height equivalent to the control surface of the ultrasonic control platform; the control system is used to control the milling cutter of the milling machine to perform milling processing on the metal component from above, and at the same time, according to the position of the milling cutter, control each ultrasonic probe to use corresponding power to perform stress control on the metal component from below, so that different areas of the planar metal component are ultrasonically controlled using corresponding power during the milling process, reducing the deformation of the planar metal component, and improving its processing efficiency and extending its conformal period. A vacuum suction cup is also set in the ultrasonic control platform to further adsorb the metal component on the ultrasonic control platform with a uniformly distributed adsorption force, and a spring is set between the sleeve and the flange of the ultrasonic probe to control the close coupling between the ultrasonic transducer and the metal component to improve the efficiency of ultrasonic control.

[0086] Combine the following Figures 5 and 6 A milling method embodiment of the present invention is introduced.

[0087] In a milling method embodiment, a milling device embodiment is used to perform milling processing, and at the same time, each ultrasonic probe is controlled according to the position of the milling cutter to use corresponding power to perform stress regulation on the metal component from below, so that different areas of the planar metal component are ultrasonically regulated using corresponding power during the milling process, thereby reducing the deformation of the planar metal component, improving its processing efficiency and extending its conformal period.

[0088] Figure 5 A schematic flow chart of an embodiment of a milling method is shown, comprising steps S110 to S140.

[0089] S110: Install a milling device described in an embodiment of a milling device, and install a metal component 400 thereon.

[0090] First, according to the size and position of the area to be processed of the metal component 400, an ultrasonic probe 210 and a vacuum suction cup 220 are installed in several through holes 203 of the ultrasonic control table 200, and then a lifting device is installed on the four lifting holes 2013 of the ultrasonic control table 200. The ultrasonic control table 200 is lifted to the center of the table of the milling machine 100, and the ultrasonic control table 200 is fixed on the table of the milling machine 100 by installing a fixing tool in the strip groove 2011.

[0091] Next, a clamping tool is installed in the inverted T-shaped groove 2012 to fix the metal component 400 on the ultrasonic control console 200 , and then the vacuum electric air valve of the vacuum driving device is opened through the control system 300 to allow each vacuum suction cup 220 to absorb the metal component 400 .

[0092] S120: Stress control is performed on the area to be processed of the metal component 400 until the residual stress in the area is less than a set threshold.

[0093] Among them, the ultrasonic power supply of the ultrasonic control system 320 excites each ultrasonic transducer 211 to transmit the ultrasonic energy wave directly into the metal component 400 through the coupling agent according to the set stress control parameters, eliminate and equalize the initial residual stress state of the surface, sub-surface and internal different depths, and at the same time detect the residual stress through the stress analyzer. If there is still residual stress exceeding the set value, the stress control is continued until the area to be processed of the metal component 400 is less than the set threshold.

[0094] For example, the metal component 400 of this embodiment is a 7075 aluminum alloy with a thickness of 40 mm, which needs to be milled to a thickness of 20 mm and then processed into a shape. The area to be processed is the entire metal component 400. When the stress of the detected points is less than 15% of the yield strength of the material, it is considered that the component is in a low stress state and can be milled in the next step.

[0095] S130: Milling is performed on the area to be processed of the metal component 400, and at the same time, stress control is performed on different areas using corresponding milling control parameters through each ultrasonic transducer 211.

[0096] In the ultrasonic milling process, the ultrasonic control system 320 is used to set the ultrasonic power output power, the ultrasonic transducer 211 amplitude, the excitation timing and other parameters, and the ultrasonic induced effect is used to reduce the milling force and milling heat to reduce the milling deformation. Furthermore, different ultrasonic powers are used to perform ultrasonic control on the area being milled, the area where the milling is completed, and the area that has not been milled of the metal component.

[0097] Figure 6 The power relationship of ultrasonic transducers at different positions is shown, ultrasonic transducer 1 is in the molding area after milling, ultrasonic transducer 2 is in the area directly below the milling cutter, and ultrasonic transducer 3 is below the unmilled area. The milling machine control system 310 transmits the real-time position information of the transmission tool to the ultrasonic control system 320, and pre-writes or programs the output power and working time parameters of each ultrasonic transducer in the ultrasonic control system 320, so that ultrasonic transducer 2 is in a high-power output state, ultrasonic transducer 1 is in a medium-power output state, and ultrasonic transducer 3 is in a low-power output state.

[0098] S140: After the milling process is completed, stress control is performed on the processing area of ​​the metal component 400 until the residual stress in the area is less than a set threshold.

[0099] Among them, the clamping fixture and the vacuum chuck 220 are kept unchanged to perform in-situ reduction and equalization of the milling residual stress. Similarly, the residual stress reduction effect is confirmed by the stress detector. When the stress of the detected points is less than 15% of the material yield strength, it is considered that the component is in a low stress state and the next milling process can be carried out until the final fine milling forming.

[0100] From the above, in a milling method embodiment, a milling device embodiment is used to perform milling processing, and at the same time, each ultrasonic probe is controlled according to the position of the milling cutter to use corresponding power to perform stress regulation on the metal component from below, so that different areas of the planar metal component are ultrasonically regulated using corresponding power during the milling process, thereby reducing the deformation of the planar metal component, improving its processing efficiency and extending its conformal period. Before and after milling, the metal component is also stress-detected and regulated to reduce its residual stress to a set threshold, thereby further reducing the deformation of the metal component.

[0101] Note that the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in more detail through the above embodiments, the present invention is not limited to the above embodiments, and may also include more other equivalent embodiments without departing from the concept of the present invention, all of which belong to the scope of protection of the present invention.

Claims

1. A milling device for milling a planar metal component, characterized in that: include: Milling machine, ultrasonic control console, control system; The ultrasonic control table is assembled on the table of the milling machine, and the metal component is fixed on the upper end surface of the ultrasonic control table; The ultrasonic control platform is equipped with a first number of ultrasonic probes, and the coupling surface of each ultrasonic probe is at a height equivalent to the upper end surface of the ultrasonic control platform; The ultrasonic control platform is a box-shaped structure without a bottom, and a second number of first through holes passing through the top of the box-shaped structure is provided, and the second number is greater than the first number; Each of the ultrasonic probes passes through a first through hole to couple with the metal component and is fixed on the assembly surface of the ultrasonic control console, wherein the assembly surface is the inner surface of the box-like structure with the top facing downward; Each ultrasonic probe includes an ultrasonic transducer, a sleeve, a flange, a fourth number of plug bolts and a fourth number of springs; The sleeve is fixed on the assembly surface and is sleeved on the outside of the ultrasonic transducer and the flange. The ultrasonic transducer passes through and is fixed on the flange. The flange is tightened from below by the spring and fits the assembly surface. A fourth number of second through holes is arranged at the bottom of the sleeve, a fourth number of third threaded holes is arranged at the periphery of the flange, and each of the plug bolts passes through a corresponding second through hole of the sleeve and a third threaded hole of the flange of the spring sequentially from bottom to top, and is fixed to the flange by threads; The coupling surface of the ultrasonic transducer is coupled to the metal component through a corresponding first through hole; The control system is used to control the milling cutter of the milling machine to perform milling processing on the metal component from above, and at the same time control each ultrasonic probe to use corresponding power to perform stress regulation on the metal component from below according to the position of the milling cutter, wherein the ultrasonic transducer below the area where the milling cutter is milling is in a first power output state, the ultrasonic transducer below the area where the milling process has been completed is in a second power output state, and the ultrasonic transducer below the area where the milling process has not been completed is in a third power output state, and the first power is greater than the second power, and the second power is greater than the third power.

2. The device according to claim 1, characterized in that: The ultrasonic control platform is further equipped with a third number of vacuum suction cups for fixing the metal component by adsorption, each vacuum suction cup passes through a first through hole and is fixed on the assembly surface of the ultrasonic control platform, and the sum of the third number and the first number is equal to or less than the second number; The control system is also used to control the vacuum suction cup to produce an adsorption effect.

3. The device according to claim 1, characterized in that: An outward extension is arranged at the lower part of two mutually parallel sides of the ultrasonic control platform, and a plurality of strip grooves are arranged on the extension to place fixing components so as to assemble the ultrasonic control platform on the table of the milling machine.

4. The device according to claim 1, characterized in that: A crisscross inverted T-shaped groove is arranged on the top of the ultrasonic control console for placing pressure strips to fix the metal component.

5. The device according to claim 2, characterized in that: Also included is a vacuum suction cup driving device, which includes: a vacuum air pump, a vacuum electric air valve and a vacuum air pipe; The vacuum air pump is connected to the vacuum suction cup through a vacuum electric air valve and a vacuum air pipe; The vacuum electric air valve is used to receive a signal from the control system and open or close the air path between the vacuum air pump and the vacuum suction cup accordingly.

6. The device according to any one of claims 1 to 5, characterized in that: Also includes: A stress analyzer is used to detect the stress of the metal component through the ultrasonic probe.

7. A milling method, using the device according to claim 6 to perform milling processing on a planar metal component, characterized in that: include: While the metal component is milled by a milling cutter on the upper plane of the metal component, the metal component is ultrasonically regulated by a plurality of ultrasonic probes on the lower plane of the metal component; Wherein, different ultrasonic powers are used to perform ultrasonic control on the area of ​​the metal component that is being milled, the area that has completed milling, and the area that has not been milled.

8. The method according to claim 7, characterized in that: Also includes: Before ultrasonic milling, the ultrasonic probe is used to perform stress analysis on the metal component, and when there is an area where the stress is greater than a set threshold, the ultrasonic probe is used to regulate the stress of the area; and / or After ultrasonic milling, the ultrasonic probe is used to perform stress analysis on the metal component. When there is a region where the stress is greater than a set threshold, the ultrasonic probe is used to regulate the stress of the region.

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