Flexible Grinding Device and Method for Knife Marks

Abstract

This invention belongs to the field of 3C workpiece grinding technology, and particularly relates to a flexible grinding device and method for tool marks. It overcomes the shortcomings of existing technologies, such as unreasonable design. This flexible grinding device includes a rotating ring disk. A flexible grinding brush bundle forming a circle is provided on the lower surface of the rotating ring disk. A follower disk parallel to the rotating ring disk is provided on the upper surface of the rotating ring disk. A deflector disk is provided inside the rotating ring disk. A deflection drive mechanism is provided on the follower disk to drive the deflector disk to swing relative to the rotating ring disk. A flexible grinding oscillating brush bundle is provided on the lower surface of the deflector disk. Several vertical arc-shaped grooves are provided on the inner wall of the rotating ring disk. Several transverse elastic elements that elastically abut against the vertical arc-shaped grooves are provided on the outer circumferential surface of the deflector disk. Advantages of this application: By using a deflector disk with varying heights and adjustable angles, it can thoroughly grind tool marks on the large flat surfaces and boss surfaces of the workpiece, as well as the outer circumferential surfaces of the bosses.

Description

Technical Field

[0001] This invention belongs to the field of 3C workpiece grinding technology, and particularly relates to a flexible grinding device and method for tool marks. Background Technology

[0002] Milled parts for 3C products (such as laptop frames) are machined using milling cutters to create large flat surfaces and protrusions on these surfaces. The flat surfaces and protrusions are then connected by a circumferential surface. See the attached drawing for a specific workpiece. Figure 1 .

[0003] In the field of precision-assembling 3C parts, tool marks need to be removed. Existing removal methods include shot blasting. Although this method can achieve the purpose of removing tool marks, the workpiece moves freely in the shot blasting machine, which will seriously affect the assembly accuracy of the workpiece (i.e., there will be collisions and impacts).

[0004] To address this, an inventor has designed an adaptive flexible planar deburring and de-knife-marking brush with each bundle of bristles capable of rebounding (application number 202120960298.6). The brush brush includes a main structure comprising a brush disk and a constraint disk coaxially connected. An adjusting shaft is located at the center of the brush disk and constraint disk, passing through both. The brush disk has mounting holes evenly and equidistantly distributed around its central circumference. The constraint disk has limiting holes aligned with the mounting holes. A spring is located within the mounting holes, and ceramic fiber bristles are located at the lower end of the spring, with the lower ends of the ceramic fiber bristles passing through the limiting holes. The advantages of this solution are as follows: the ceramic fiber brush filaments have a certain degree of freedom within the brush disc and can float up and down via springs. At the same time, a constraint disc is set to keep the front end of the brush filaments from coming loose, ensuring that each brush filament cuts vertically and is consumed, which can improve the consistency of the workpiece surface effect. Furthermore, using ceramic fiber as the material for the brush filaments can not only ensure the removal of burrs and tool marks, but also provide high wear resistance. In addition, the ceramic fiber brush filaments are detachable and replaceable, and the mechanical structure is reusable.

[0005] The above solution uses flexible brush bristles to remove tool marks, which can prevent the workpiece from being damaged by collisions and other factors that could reduce its precision. However, the solution uses brush bristles of uniform height for grinding, which still cannot completely remove tool marks on the outer periphery of bosses and large flat surfaces, requiring manual grinding again, which is inefficient. Summary of the Invention

[0006] The purpose of this invention is to address the above-mentioned problems by providing a flexible grinding device and method for blade marks that can solve the aforementioned technical issues.

[0007] To achieve the above objectives, the present invention adopts the following technical solutions:

[0008] This flexible grinding device for knife marks includes a rotating ring disk. A flexible grinding brush bundle forming a circle is provided on the lower surface of the rotating ring disk. A follower disk parallel to the rotating ring disk is provided on the upper surface of the rotating ring disk. A deflector disk is provided inside the rotating ring disk. A deflection drive mechanism is provided on the follower disk to drive the deflector disk to swing relative to the rotating ring disk. A flexible grinding swing brush bundle is provided on the lower surface of the deflector disk. A number of vertical arc-shaped grooves are provided on the inner wall of the rotating ring disk. A number of transverse elastic elements that elastically abut against the vertical arc-shaped grooves are provided on the outer circumferential surface of the deflector disk.

[0009] When the rotating ring disk and the skew disk are aligned, the lower end of the flexible polishing oscillating brush bundle is located above and to the side of the flexible polishing brush bundle.

[0010] When the skew disk is skewed, a portion of the lower end of the flexible grinding oscillating brush bundle is located below the lower end side of the flexible grinding brush bundle.

[0011] In the aforementioned flexible grinding device for knife marks, a spherical through hole is provided in the rotating ring disk, and a spherical convex surface is provided on the outer peripheral surface of the deflector disk, wherein the spherical convex surface is in tangential contact with the spherical through hole.

[0012] In the aforementioned flexible grinding device for knife-marking, the lower end of the vertical arc-shaped groove is provided with a constriction opening.

[0013] In the aforementioned flexible grinding device for knife marks, the deflection drive mechanism includes four sets of cylinders arranged in a cross shape. The telescopic rod of each set of cylinders passes through the rotating disk and abuts against the upper surface of the deflection disk.

[0014] In the aforementioned flexible grinding device for blade patterns, the rotating ring disk and the accompanying rotating disk are connected and fixed together by several circumferentially distributed connecting rods.

[0015] In the aforementioned flexible polishing device for blade patterns, both the flexible polishing brush bundle and the flexible polishing oscillating brush bundle are carbon fiber brush bundles.

[0016] In the aforementioned flexible grinding device for knife marks, the transverse elastic element includes a constricted cylinder fixed to the outer circumferential surface of the slant plate. A contact ball is provided inside the outer opening of the constricted cylinder, and part of the contact ball protrudes outward from the outer opening of the constricted cylinder. A spring is provided inside the constricted cylinder, one end of the spring acts on the contact ball, and the other end of the spring acts on the inner end of the constricted cylinder.

[0017] In the aforementioned flexible polishing device for blade patterns, the density of the flexible polishing brush bundle is less than the density of the flexible polishing oscillating brush bundle in the same unit area.

[0018] In the aforementioned flexible grinding device for blade patterns, at least two of the transverse elastic elements are symmetrically distributed about the axis of the skew disk.

[0019] This application also provides a method for flexible polishing of blade marks, wherein the flexible polishing device described above is used for polishing, and the method includes the following steps:

[0020] S1. Surface grinding: The rotating ring disk and the skew disk are flush. The flexible grinding brush bundle on the rotating ring disk grinds the large surface of the workpiece, and the flexible grinding swing brush bundle on the skew disk grinds the protrusion surface on the workpiece.

[0021] S2. Oblique grinding: The oblique disc is oblique, so that the flexible grinding oscillating brush bundle on the oblique disc grinds the circumferential surface connected to the large plane and the boss plane in sequence in different dimensions.

[0022] Compared with existing technologies, the advantages of this application are:

[0023] By using a tilting disc with adjustable height and angle, the tool marks on the large flat surface, boss surface, and outer peripheral surface of the workpiece can be thoroughly ground, improving workpiece quality and eliminating the tedious process of manually grinding the outer peripheral surface.

[0024] The combination of the vertical arc groove and the horizontal elastic element allows the skew disk to rotate synchronously with the rotating ring disk. At the same time, it also creates a radial elastic resisting force between the rotating ring disk and the skew disk to provide radial displacement during rotation and improve the stability of the skew grinding process. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the workpiece.

[0026] Figure 2 This is a schematic diagram of the flexible grinding device for blade patterns provided by the present invention.

[0027] Figure 3 This is a partial structural schematic diagram of the flexible grinding device for blade patterns provided by the present invention.

[0028] Figure 4 This is a schematic diagram of the skew state provided by the present invention.

[0029] Figure 5 This is a schematic diagram of the structure of Embodiment 4 provided by the present invention.

[0030] Figure 6 This is a schematic diagram of the structure of Embodiment Seven provided by the present invention.

[0031] Figure 7This is a schematic diagram of the arc-shaped extrusion plate provided by the present invention forming a circle.

[0032] In the figure, there are: 1. Rotating ring disk; 10. Vertical arc groove; 11. Spherical through hole; 12. Brush bundle fixing ring; 13. Fixing vertical plate; 14. Adjusting screw; 15. Rotation power; 2. Flexible grinding brush bundle; 3. Follow-up disk; 4. Deflection disk; 40. Lateral elastic element; 400. Narrowing cylinder; 401. Contact ball; 402. Spring; 41. Spherical convex surface; 5. Deflection drive mechanism; 50. Cylinder; 51. Telescopic rod; 6. Flexible grinding swing brush bundle; 7. Connecting rod; 8. Arc extrusion plate. Detailed Implementation

[0033] The following are specific embodiments of the invention, which are described in conjunction with the accompanying drawings. The technical solution of the invention will be further described, but the invention is not limited to these embodiments.

[0034] like Figure 1 As shown, the workpiece includes a large flat surface and a boss provided on the large flat surface.

[0035] Example 1

[0036] like Figures 2-4 As shown, this flexible grinding device for knife marks includes a rotating ring disk 1, which is in a horizontal state. The rotating ring disk 1 is driven by a rotational power 15, which includes a servo motor, etc.

[0037] The rotational power is fixed to the frame to enable the installation of the grinding device.

[0038] A flexible grinding brush bundle 2 is provided on the lower surface of the rotating ring disk 1 to form a circle. The flexible grinding brush bundle 2 provides a grinding effect on the large surface of the workpiece to remove tool marks.

[0039] A rotating disk 3, parallel to the rotating ring disk 1, is provided on the upper surface of the rotating ring disk 1. Specifically, the rotating ring disk 1 and the rotating disk 3 are connected and fixed together by a number of circumferentially distributed connecting rods 7. The connecting rods 7 are fixedly connected to the rotating ring disk 1 or the rotating disk 3 by means of threads, welding, etc.

[0040] In a preferred embodiment, the connecting rods 7 have at least three rods and are evenly distributed around the circumference.

[0041] Inside the rotating ring disk 1, there is a slant disk 4, which can be understood as a movable universal ball joint. On the rotating disk 3, there is a slant drive mechanism 5 that drives the slant disk 4 to swing relative to the rotating ring disk 1. The slant drive mechanism 5 serves the purpose of angle adjustment.

[0042] like Figures 2-4As shown, a flexible grinding oscillating brush bundle 6 is provided on the lower surface of the slant disk 4. The flexible grinding oscillating brush bundle 6 is used to perform slanted grinding on the boss plane and the circumferential surface around the boss plane. For example, the flexible grinding oscillating brush bundle 6 is perpendicular to the circumferential surface of the workpiece. Several vertical arc-shaped grooves 10 are provided on the inner wall of the rotating ring disk 1. Several transverse elastic elements 40 that elastically abut against the vertical arc-shaped grooves 10 are provided on the outer circumferential surface of the slant disk 4. At least two transverse elastic elements 40 are symmetrically distributed about the axis of the slant disk 4. The transverse elastic element 40 includes a constricted cylinder 400 fixed to the outer peripheral surface of the swashplate 4. A contact ball 401 is provided inside the outer opening of the constricted cylinder 400. Part of the contact ball 401 protrudes outward from the outer opening of the constricted cylinder 400. A spring 402 is provided inside the constricted cylinder 400. One end of the spring 402 acts on the contact ball 401, and the other end of the spring 402 acts on the inner end of the constricted cylinder 400.

[0043] In this embodiment, both the flexible polishing brush bundle 2 and the flexible polishing oscillating brush bundle 6 are carbon fiber brush bundles. Furthermore, the density of the flexible polishing brush bundle 2 is lower than the density of the flexible polishing oscillating brush bundle 6 per unit area. Because the boss has a smaller volume, the higher density design allows the flexible polishing oscillating brush bundle 6 to effectively polish the boss and its outer peripheral surface.

[0044] The cooperation between the vertical arc groove 10 and the transverse elastic element 40 enables the slant disk 4 to rotate synchronously with the rotating ring disk 1. At the same time, it also creates a radial elastic resisting force between the rotating ring disk 1 and the slant disk 4 to provide radial displacement during rotation.

[0045] Secondly, the transverse section of the vertical arc groove 10 is a semi-circular groove, and the transverse elastic element 40 matches the semi-circular groove. In addition to solving the impact noise, it can also play a role in stabilizing the situation.

[0046] When the rotating ring disk 1 and the skew disk 4 are aligned, the lower end of the flexible grinding oscillating brush bundle 6 is located above and to the side of the flexible grinding brush bundle 2; at this time, it is in the state of grinding the large flat surface and the boss surface.

[0047] When the skew disk 4 is skewed, the lower end of part of the flexible grinding oscillating brush bundle 6 is located below the lower end of the flexible grinding brush bundle 2. At this time, it is in the state of grinding the large flat surface and the peripheral surface of the boss.

[0048] The circumferential surface of the boss has multiple dimensions. Therefore, when polishing the circumferential surface, it is necessary to adjust the corresponding angle of the skew plate 4 according to the different dimensions of the circumferential surface so that the flexible polishing oscillating brush bundle 6 can polish the different dimensions of the circumferential surface.

[0049] When grinding different circumferential surfaces, the workpiece moves along the X and Y axes, which are perpendicular to the vertical direction, so that the length of the circumferential surface can be ground. Here, the vertical direction can be understood as the Z-axis.

[0050] This embodiment uses a tilting disc 4 with adjustable height and angle, which can thoroughly grind the tool marks on the large flat surface and boss surface of the workpiece, as well as the outer peripheral surface of the boss, improving the quality of the workpiece and eliminating the tedious process of manually grinding the outer peripheral surface.

[0051] like Figures 2-4 As shown, a spherical through-hole 11 is provided in the rotating ring disk 1. The wall of the spherical through-hole 11 is a spherical concave structure. A spherical convex surface 41 is provided on the outer circumferential surface of the slant disk 4. The spherical convex surface 41 is in tangential contact with the spherical through-hole 11. The single-sided structural line of the spherical convex surface 41 includes a central arc line and end arc lines connecting the two ends of the central arc line. The centers of the two end arc lines coincide, and the radius of the central arc line is larger than the radius of the end arc lines.

[0052] The spherical convex surface 41 is in contact with the spherical through hole 11 at its maximum diameter.

[0053] Secondly, a contraction opening is provided at the lower end of the vertical arc-shaped groove 10. The contraction opening serves to limit the tilt and prevent detachment. Of course, screws or other methods can be used to replace the contraction opening at the lower end of the vertical arc-shaped groove 10.

[0054] Specifically, the skew drive mechanism 5 of this embodiment includes four sets of cylinders 50, which are arranged in a cross shape. The telescopic rod 51 of each set of cylinders 50 passes through the turntable 3 and abuts against the upper surface of the skew plate 4.

[0055] The corresponding telescopic rods 51 of the four sets of cylinders 50 extend to different lengths to control the tilt angle of the swashplate 4. Of course, it is possible that the extension lengths of the telescopic rods 51 of two opposite cylinders 50 are the same, while the extension lengths of the telescopic rods 51 of the other two sets of cylinders 50 are different.

[0056] The polishing steps are as follows:

[0057] First, grind the large flat surfaces and boss surfaces;

[0058] Then, the large flat surface and the outer peripheral surface of the boss are polished, and the multiple dimensions of the outer peripheral surface are polished in sequence.

[0059] For example, when the slant plate 4 tilts to the lower left, the flexible grinding oscillating brush bundle 6 grinds the left side of the outer circumference; when the slant plate 4 tilts to the lower right, the flexible grinding oscillating brush bundle 6 grinds the right side of the outer circumference; the same applies when tilting to the lower back and lower front.

[0060] Example 2

[0061] like Figures 2-4As shown, this embodiment provides a flexible grinding method for blade patterns using the method described in Embodiment 1. The method includes the following steps:

[0062] S1. Surface grinding: Rotating ring disk 1 and slant disk 4 are flush (on a horizontal plane). Flexible grinding brush bundle 2 on rotating ring disk 1 grinds the large surface of the workpiece, and flexible grinding swing brush bundle 6 on slant disk 4 grinds the protrusion surface of the workpiece.

[0063] S2. Oblique grinding: The oblique disk 4 is oblique, so that the flexible grinding oscillating brush bundle 6 on the oblique disk 4 grinds the circumferential surface connected to the large plane and the boss plane in different dimensions in sequence.

[0064] Example 3

[0065] Based on Example 1, such as Figures 2-4 As shown, a brush bundle fixing ring 12 is connected to the lower surface of the rotating ring disk 1 by screws, and the flexible grinding brush bundle 2 is fixed to the brush bundle fixing ring 12.

[0066] A brush bundle fixing plate is connected to the lower surface of the slant plate 4 by a screw, and the flexible grinding oscillating brush bundle 6 is fixed to the brush bundle fixing plate.

[0067] The above methods can be used to disassemble and replace the flexible grinding brush bundle 2 and the flexible grinding oscillating brush bundle 6.

[0068] Example 4

[0069] Based on Example 1, such as Figure 5 As shown, the two side walls of the vertical arc-shaped groove 10 have several spherical recesses 100 that match the contact ball 401. Two opposing spherical recesses on the two side walls form a semi-circular groove. When the deflection drive mechanism 5 is driven, the contact ball 401 jumps between different semi-circular grooves to achieve angle adjustment. At the same time, this method makes the position of the deflection disk 4 in the thickness direction more stable relative to the rotating ring disk 1.

[0070] Example 5

[0071] Based on Embodiment 1, the telescopic rod 51 of cylinder 50 and the swashplate 4 are connected by a universal hinge.

[0072] Example 6

[0073] Based on Embodiment 1, the rotating ring disk 1 is formed by two interlocking semi-rings, which facilitates the insertion and removal of the slant disk 4.

[0074] Example 7

[0075] Based on Example 1, such as Figures 6-7As shown, a fixed vertical plate 13 is provided on the outer circumference of the rotating ring disk 1. Several arc-shaped extrusion plates 8 are provided between the inner ring of the flexible grinding brush bundle 2 and the outer ring of the flexible grinding oscillating brush bundle 6. An adjusting screw 14 is threadedly connected to the fixed vertical plate 13. One end of the adjusting screw 14 is rotatably connected to the arc-shaped extrusion plate 8. Each arc-shaped extrusion plate 8 corresponds to at least two adjusting screws 14.

[0076] Rotate the adjusting screw 14 to change the position of the arc-shaped extrusion plate 8. The change in the position of the arc-shaped extrusion plate 8 can prevent the flexible grinding brush bundle 2 from contacting the large surface. That is, when only the outer peripheral surface needs to be ground, the arc-shaped extrusion plate 8 will form a radial extrusion from the inside to the outside on the flexible grinding brush bundle 2.

[0077] When the arc-shaped extrusion plate 8 forms a circle, the inner diameter of the arc-shaped extrusion plate 8 is larger than the outer diameter of the flexible grinding oscillating brush bundle 6.

[0078] The specific embodiments described herein are merely illustrative of the spirit of the invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of the invention or exceeding the scope defined by the appended claims.

Claims

1. A flexible abrasive grinding device, comprising a rotating ring disk (1), wherein a flexible abrasive brush bundle (2) is provided on the lower surface of the rotating ring disk (1) to form a ring, characterized in that, A follower disk (3) parallel to the rotating ring disk (1) is provided on the upper surface of the rotating ring disk (1). A deflector disk (4) is provided inside the rotating ring disk (1). A deflection drive mechanism (5) for driving the deflector disk (4) to swing relative to the rotating ring disk (1) is provided on the follower disk (3). A flexible grinding swing brush bundle (6) is provided on the lower surface of the deflector disk (4). A plurality of vertical arc grooves (10) are provided on the inner wall of the rotating ring disk (1). A plurality of transverse elastic elements (40) that elastically abut against the vertical arc grooves (10) are provided on the outer circumferential surface of the deflector disk (4). When the rotating ring disk (1) and the skew disk (4) are aligned, the lower end of the flexible polishing oscillating brush bundle (6) is located above and to the side of the flexible polishing brush bundle (2); When the skew disk (4) is skewed, part of the flexible polishing oscillating brush bundle (6) has its lower end located below the lower end side of the flexible polishing brush bundle (2).

2. The flexible grinding device for blade marks according to claim 1, characterized in that, A spherical through hole (11) is provided in the rotating ring disk (1), and a spherical convex surface (41) is provided on the outer peripheral surface of the skew disk (4). The spherical convex surface (41) is in tangential contact with the spherical through hole (11).

3. The flexible grinding device for blade marks according to claim 1, characterized in that, The lower end of the vertical arc-shaped groove (10) is provided with a contraction opening.

4. The flexible grinding device for blade marks according to claim 1, characterized in that, The skew drive mechanism (5) includes four sets of cylinders (50), which are arranged in a cross shape. The telescopic rod (51) of each set of cylinders (50) passes through the rotating disk (3) and abuts against the upper surface of the skew disk (4).

5. The flexible grinding device for blade marks according to claim 1, characterized in that, The rotating ring disk (1) and the accompanying rotating disk (3) are connected and fixed together by several circumferentially distributed connecting rods (7).

6. The flexible grinding device for blade marks according to claim 1, characterized in that, Both the flexible grinding brush bundle (2) and the flexible grinding oscillating brush bundle (6) are carbon fiber brush bundles.

7. The flexible grinding device for blade marks according to claim 1, characterized in that, The transverse elastic element (40) includes a constricted cylinder (400) fixed to the outer peripheral surface of the swashplate (4). A contact ball (401) is provided inside the outer opening of the constricted cylinder (400). Part of the contact ball (401) protrudes outward from the outer opening of the constricted cylinder (400). A spring (402) is provided inside the constricted cylinder (400). One end of the spring (402) acts on the contact ball (401), and the other end of the spring (402) acts on the inner end of the constricted cylinder (400).

8. The flexible grinding device for blade marks according to claim 1, characterized in that, On the same unit area, the density of the flexible grinding brush bundle (2) is less than the density of the flexible grinding oscillating brush bundle (6).

9. The flexible grinding device for blade marks according to claim 1, characterized in that, At least two of the lateral elastic elements (40) are symmetrically distributed about the axis of the skew disk (4).

10. A method for flexible polishing of knife-like textures, characterized in that, The flexible polishing method for blade patterns uses the flexible polishing device described in any one of claims 1-9 for polishing, and the flexible polishing method for blade patterns includes the following steps: S1. Surface grinding: The rotating ring disk (1) and the skew disk (4) are flush. The flexible grinding brush bundle (2) on the rotating ring disk (1) grinds the large surface of the workpiece, and the flexible grinding swing brush bundle (6) on the skew disk (4) grinds the protrusion surface on the workpiece. S2, skew grinding, the skew disk (4) is skewed, so that the flexible grinding swing brush bundle (6) on the skew disk (4) grinds the circumferential surface connected to the large plane and the boss plane in sequence in different dimensions.

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