Circuit board vibration air floating shaft drilling machine and operation method thereof

Abstract

The invention provides a circuit board vibration air floating shaft drilling machine and an operation method thereof, and belongs to the technical field of PCB precision machining equipment. Comprising magnetic induction assemblies and floating rotating shafts. The magnetic induction assembly is provided with a first squirrel-cage induction stator assembly, a second squirrel-cage induction stator assembly and an induction rotor assembly located between the first squirrel-cage induction stator assembly and the second squirrel-cage induction stator assembly, and the induction rotor assembly is fixed to the floating rotating shaft. The center point of the rotor is driven to move in the vertical direction by controlling the difference between currents introduced into the two stator assemblies, and therefore the floating rotating shaft and the drill point are driven to vibrate. An air floating assembly is further arranged, and air is introduced around the floating rotating shaft to enable the floating rotating shaft to suspend. Vibration parameters can be adjusted in real time, machining requirements of different circuit boards are met, chip removal is effectively promoted, the drilling quality and precision are improved, and drill point abrasion is reduced.

Description

Technical Field

[0001] This invention relates to the field of PCB precision processing equipment technology, and in particular to a PCB vibration air-floating shaft drilling machine and its operating method. Background Technology

[0002] In traditional circuit board drilling, drill chips tend to accumulate in the drilled holes. As drilling depth increases, if the drill chips are not effectively removed, it will not only interfere with the precise control of drilling depth, causing depth deviations between different holes and affecting the quality and reliability of subsequent conductive vias, but the residual drill chips will also hinder the drill bit from continuing to drill, resulting in rough hole edges and thus reducing the overall performance of the printed circuit board. Summary of the Invention

[0003] In view of the problems existing in the prior art, the present invention is proposed.

[0004] Therefore, the present invention aims to solve the problems of inaccurate hole depth and rough hole walls caused by the difficulty in removing drill chips during circuit board drilling.

[0005] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a circuit board vibration air-floating shaft drilling machine, comprising a magnetic induction assembly, including a first squirrel-cage induction stator assembly, a second squirrel-cage induction stator assembly, and an induction rotor assembly; the second squirrel-cage induction stator assembly is disposed on one side of the first squirrel-cage induction stator assembly, the induction rotor assembly is surrounded by the first squirrel-cage induction stator assembly and the second squirrel-cage induction stator assembly, and the rotor center point of the induction rotor assembly in the vertical direction is located between the first squirrel-cage induction stator assembly and the second squirrel-cage induction stator assembly; and a floating shaft, the induction rotor assembly is fixedly disposed on the floating shaft, and the first squirrel-cage induction stator assembly and the second squirrel-cage induction stator assembly surround the induction rotor assembly on the floating shaft; wherein, by controlling a current difference between a first current supplied to the first squirrel-cage induction stator assembly and a second current supplied to the second squirrel-cage induction stator assembly, the rotor center point is driven to move along the vertical direction, thereby causing the floating shaft to vibrate along the vertical direction.

[0006] In a preferred embodiment of the circuit board vibration air-bearing shaft drilling machine of the present invention, when the first current is greater than the second current, the rotor center point moves toward the first squirrel-cage induction stator assembly, such that the fifth distance from the rotor center point to the first squirrel-cage induction stator assembly is less than the sixth distance from the rotor center point to the second squirrel-cage induction stator assembly; when the second current is greater than the first current, the rotor center point moves toward the second squirrel-cage induction stator assembly, such that the third distance from the rotor center point to the second squirrel-cage induction stator assembly is less than the fourth distance from the rotor center point to the first squirrel-cage induction stator assembly.

[0007] As a preferred embodiment of the circuit board vibration air-bearing shaft drilling machine of the present invention, it further includes: an air-bearing assembly, the air-bearing assembly being arranged around the floating shaft and including a first air-bearing bearing and a movable space; the first air-bearing bearing being used to introduce gas into the movable space, and having a bearing inner ring diameter in the horizontal direction; the floating shaft including a first shaft portion extending along the vertical direction, the first shaft portion having a shaft diameter; wherein, the bearing inner ring diameter is larger than the shaft diameter, so that the floating shaft is suspended within the movable space.

[0008] As a preferred embodiment of the circuit board vibration air-bearing shaft drilling machine of the present invention, the air-bearing assembly further includes a second air-bearing bearing disposed on one side of the first air-bearing bearing, the second air-bearing bearing being used to introduce gas into the movable space, and having an inner bearing clearance in the vertical direction; the floating shaft further includes a second shaft portion extending along the horizontal direction, the second shaft portion having a lateral shaft height; wherein, the inner bearing clearance is greater than the lateral shaft height.

[0009] To address the aforementioned problems, the present invention also provides an operating method for a circuit board vibration air-bearing shaft drilling machine, applicable to the circuit board vibration air-bearing shaft drilling machine, comprising the following steps: passing a first current to the first squirrel-cage induction stator assembly and passing a second current to the second squirrel-cage induction stator assembly; controlling the current difference between the first current and the second current to drive the rotor center point of the induction rotor assembly to move in the vertical direction, thereby causing the floating shaft to vibrate in the vertical direction.

[0010] In a preferred embodiment of the operating method of the circuit board vibration air-bearing shaft drilling machine of the present invention, the step of controlling the current difference includes: adjusting the magnitude of the first current and the second current; when the first current is greater than the second current, driving the rotor center point to move toward the first squirrel-cage induction stator assembly; when the second current is greater than the first current, driving the rotor center point to move toward the second squirrel-cage induction stator assembly.

[0011] In a preferred embodiment of the operating method of the circuit board vibration air-floating shaft drilling machine of the present invention, when the first current is equal to the second current, the first distance from the rotor center point to the first squirrel-cage induction stator assembly is equal to the second distance from it to the second squirrel-cage induction stator assembly.

[0012] As a preferred embodiment of the operating method of the circuit board vibration air-floating shaft drilling machine of the present invention, before driving the floating shaft to vibrate, the method further includes the step of: introducing gas into the movable space surrounding the floating shaft through the air-floating component to suspend the floating shaft.

[0013] The beneficial effects of this invention are as follows: Through the synergistic design of the magnetic induction component and the floating shaft, this invention utilizes the magnetic induction effect generated by the current difference between the stator components on both sides to drive the rotor and shaft to perform precise vertical displacement, thereby producing a stable and adjustable vibration effect on the drill bit. This not only allows for real-time adjustment of the vibration amplitude and frequency to adapt to the processing requirements of printed circuit boards of different thicknesses and materials, significantly improving processing flexibility and control precision; but also effectively promotes the removal of drill chips from the hole, avoiding hole depth deviation and hole wall roughness caused by chip accumulation, thus improving hole quality and drilling accuracy. Simultaneously, the floating shaft, combined with the suspension support of the air-bearing component, significantly reduces the contact friction between the drill bit and the hole wall, reducing drill bit wear and processing heat accumulation, extending drill bit lifespan and reducing maintenance costs. Furthermore, the stable suspension effect provided by the air-bearing component reduces the transmission of vibration to the overall mechanical structure, ensuring a smoother and more reliable drilling process. This comprehensively improves the shortcomings of traditional equipment in terms of chip removal, hole quality, and precision, achieving high-precision, high-stability, and high-yield drilling processing. Attached Figure Description

[0014] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a cross-sectional view of the circuit board vibration air-floating shaft drilling machine of the present invention.

[0016] Figure 2 This is a side view of the magnetic induction component and floating rotating shaft of the present invention.

[0017] Figure 3 For the present invention Figure 2 Sectional view along line 3-3.

[0018] Figure 4 This is a partial exploded view of the magnetic induction component and the floating rotating shaft of the present invention.

[0019] Figure 5 This is one of the schematic diagrams of the circuit board vibration air-floating shaft drilling machine of the present invention during operation.

[0020] Figure 6 This is the second schematic diagram of the circuit board vibration air-floating shaft drilling machine of the present invention during operation.

[0021] Figure 7 This is the third schematic diagram of the circuit board vibration air-floating shaft drilling machine of the present invention during operation.

[0022] Figure 8 This is a schematic diagram illustrating the changes in the first and second currents of the present invention.

[0023] Figure 9 This is a flowchart of the operation method of the present invention. Detailed Implementation

[0024] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0025] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0026] Secondly, the term "an embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places throughout this specification does not necessarily refer to the same embodiment, nor is it an embodiment that is mutually exclusive, either alone or selectively, with other embodiments.

[0027] Example 1, referring to Figures 1-7 This is the first embodiment of the present invention. This embodiment provides a circuit board vibration air-bearing shaft drilling machine. The circuit board vibration air-bearing shaft drilling machine 100 includes a magnetic induction component 110, a floating shaft 120 and an air-bearing component 130.

[0028] The magnetic induction component 110 is the core of the drive section, comprising a first squirrel-cage induction stator component 112, a second squirrel-cage induction stator component 114, and an induction rotor component 116. The second squirrel-cage induction stator component 114 is disposed on one side of the first squirrel-cage induction stator component 112, and the two are preferably arranged in a mirror-symmetrical manner. The induction rotor component 116 is surrounded by the first squirrel-cage induction stator component 112 and the second squirrel-cage induction stator component 114, and the geometric center of the induction rotor component 116 in the vertical direction D1, i.e., the rotor center point P, is located between the first squirrel-cage induction stator component 112 and the second squirrel-cage induction stator component 114. The first squirrel-cage induction stator component 112 and the second squirrel-cage induction stator component 114 typically include multiple sets of coil windings and a magnetic core, which can generate a rotating magnetic field when alternating current is applied. The induction rotor assembly 116 is typically made of a squirrel-cage structure of conductive material (such as aluminum or copper), with its two ends connected by a short-circuit ring to form a closed loop, which can induce current and generate electromagnetic force in the rotating magnetic field generated by the stator.

[0029] The floating shaft 120 serves as a power output shaft, with a drill bit 122 for drilling mounted at its front end. Crucially, the induction rotor assembly 116 of the magnetic induction component 110 is fixedly sleeved or mounted on the floating shaft 120, allowing the induction rotor assembly 116 to rotate together with the floating shaft 120. Simultaneously, the first squirrel-cage induction stator assembly 112 and the second squirrel-cage induction stator assembly 114 are fixedly mounted on the frame (not shown in the figure) and surround the induction rotor assembly 116 on the floating shaft 120.

[0030] The driving principle of this invention is as follows: a control module (not shown in the figure) supplies a first current to the first squirrel-cage induction stator assembly 112 and a second current to the second squirrel-cage induction stator assembly 114. By actively controlling the difference in magnitude, phase, or frequency between the first and second currents, an asymmetrical magnetic field distribution can be generated between the two stator assemblies. This asymmetry in the magnetic field generates a net magnetic force along the vertical direction D1 on the induction rotor assembly 116. Specifically, when the first current is greater than the second current, the magnetic field generated by the first squirrel-cage induction stator assembly 112 is stronger, and the rotor center point P will be subjected to a magnetic force toward the first squirrel-cage induction stator assembly 112, thereby moving upward along the vertical direction D1; conversely, when the second current is greater than the first current, the rotor center point P will move toward the second squirrel-cage induction stator assembly 114. This movement directly causes the fixed floating shaft 120 and its front-end drill bit 122 to undergo precise displacement along the vertical direction D1. By periodically and rapidly changing the magnitude relationship between the two currents, the drill bit 122 can generate the required vibration, such as... Figures 5 to 7 The different equilibrium states are shown.

[0031] Furthermore, the movement of the rotor center point P changes its distance from the two stator assemblies. For example... Figure 6 As shown, when the second current is greater than the first current, the rotor center point P moves downward, and its distance E3 to the second squirrel-cage induction stator assembly 114 is less than its distance E4 to the first squirrel-cage induction stator assembly 112. Figure 7 As shown, when the first current is greater than the second current, the situation is reversed, and the distance E5 is less than E6. When the two currents are equal, the rotor center point P is located at the intermediate equilibrium position, and the distance E1 is equal to E2, as shown. Figure 5 As shown.

[0032] To support the floating shaft 120 and achieve low-friction, high-precision motion, the present invention provides an air-bearing assembly 130. The air-bearing assembly 130 is arranged around the floating shaft 120 and mainly includes a first air-bearing bearing 132, a second air-bearing bearing 134, and a movable space 136 defined by them.

[0033] The first air bearing 132 is mainly used to provide radial (i.e., horizontal direction D2) suspension support. It has an inner bearing ring, the diameter of which is called the bearing inner ring diameter B1. The floating shaft 120 has a cylindrical portion extending along the vertical direction D1, namely the first shaft portion 124, whose outer diameter is the shaft diameter B2. The key design is that the bearing inner ring diameter B1 is larger than the shaft diameter B2, and there is an annular gap between them. By supplying air to the first air bearing 132 through an external air source, the gas is forced into this annular gap and forms a stable gas film on the outer surface of the first shaft portion 124, thereby suspending the floating shaft 120 radially (horizontal direction D2) in the movable space 136, achieving contactless support.

[0034] The second air bearing 134 is disposed on one side (e.g., below) of the first air bearing 132, primarily for providing axial (i.e., vertical direction D1) suspension constraint and support. It has a specific axial clearance in the vertical direction D1, referred to as the bearing inner clearance A1. Correspondingly, the floating shaft 120 has a flange or stepped portion extending along the horizontal direction D2, namely the second shaft portion 126, whose axial dimension is referred to as the lateral shaft height A2. Similarly, the design ensures that the bearing inner clearance A1 is greater than the lateral shaft height A2. When gas is introduced into the second air bearing 134, an air film is formed on the upper and lower surfaces of the second shaft portion 126, thereby allowing and stabilizing the small displacement of the floating shaft 120 in the vertical direction D1, while limiting its excessive axial movement.

[0035] The first air bearing 132 and the second air bearing 134 work together to supply compressed air (or other gas) into the movable space 136, so that the floating shaft 120 is supported by air in both the radial and axial directions, thereby enabling it to rotate and perform controlled vertical vibration in the movable space 136 with almost no friction.

[0036] Example 2, refer to Figure 8 and Figure 9 This is the second embodiment of the present invention. Based on the circuit board vibration air-floating shaft drilling machine 100, this embodiment proposes an operation method for the circuit board vibration air-floating shaft drilling machine, which mainly includes the following steps:

[0037] First, the air flotation initialization step is performed. Upon starting the equipment, gas at a preset pressure is introduced into the movable space 136 surrounding the floating shaft 120 through the first air bearing 132 and the second air bearing 134 of the air flotation assembly 130. The gas forms a uniform gas film between the floating shaft 120 and the bearings, causing the floating shaft 120 (along with the induction rotor assembly 116 and the shaft drill bit 122) to remain stably suspended in the movable space 136, detached from mechanical contact. This step provides a low-friction environment for subsequent high-precision vibratory drilling.

[0038] Next, the current drive and vibration control steps are entered. This step mainly includes two synergistic sub-steps: the first sub-step (S1): powering the magnetic induction component 110. The control module supplies a first current to the first squirrel-cage induction stator component 112 and a second current to the second squirrel-cage induction stator component 114. These two currents can initially be set to be equal in magnitude, at which point the rotor center point P is located in the intermediate equilibrium position, such as... Figure 5 As shown, the distances E1 and E2 from the two stator components are equal.

[0039] The second sub-step (S2): Controlling the current difference to generate vibration. This is the core of achieving vibratory drilling. The control module dynamically adjusts the difference between the first and second currents according to the desired vibration frequency and amplitude. Specifically:

[0040] When it is necessary to drive the drill bit 122 to vibrate upwards, the control module adjusts the circuit to make the first current greater than the second current. According to the principle of electromagnetic induction, this causes the rotor center point P of the induction rotor assembly 116 to receive an upward net magnetic force, thereby moving along the vertical direction D1 toward the first squirrel-cage induction stator assembly 112, and driving the floating shaft 120 and the drill bit 122 upwards; conversely, when it is necessary to drive the drill bit 122 to vibrate downwards, the second current is controlled to be greater than the first current, causing the rotor center point P to drive the drill bit 122 downwards; by using a certain frequency and waveform (e.g., sine wave, square wave, etc.) Figure 8 By alternating the magnitude of the two currents (as shown), the drill bit 122 can generate continuous, stable, and adjustable vertical vibration in the D1 direction.

[0041] Throughout the vibratory drilling process, the air flotation assembly 130 operates continuously, maintaining the stable suspension of the floating shaft 120. The vibration of the shaft drill bit 122 effectively breaks up and removes drill chips generated during the drilling process, while the air flotation support greatly reduces the friction between the drill bit and the hole wall, thereby achieving high-precision, high-quality, and high-efficiency circuit board drilling.

[0042] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A circuit board vibration air-floating shaft drilling machine, characterized in that: include, The magnetic induction assembly (110) includes a first squirrel-cage induction stator assembly (112), a second squirrel-cage induction stator assembly (114), and an induction rotor assembly (116); the second squirrel-cage induction stator assembly (114) is disposed on one side of the first squirrel-cage induction stator assembly (112), the induction rotor assembly (116) is surrounded by the first squirrel-cage induction stator assembly (112) and the second squirrel-cage induction stator assembly (114), and the rotor center point (P) of the induction rotor assembly (116) in the vertical direction (D1) is located between the first squirrel-cage induction stator assembly (112) and the second squirrel-cage induction stator assembly (114); and A floating shaft (120) is provided, and the induction rotor assembly (116) is fixedly disposed on the floating shaft (120). The first squirrel-cage induction stator assembly (112) and the second squirrel-cage induction stator assembly (114) surround the induction rotor assembly (116) on the floating shaft (120). In this process, by controlling the current difference between the first current supplied to the first squirrel-cage induction stator assembly (112) and the second current supplied to the second squirrel-cage induction stator assembly (114), the rotor center point (P) is driven to move along the vertical direction (D1), thereby causing the floating shaft (120) to vibrate along the vertical direction (D1).

2. The circuit board vibration air-floating shaft drilling machine as described in claim 1, characterized in that: When the first current is greater than the second current, the rotor center point (P) moves toward the first squirrel-cage induction stator assembly (112) such that the fifth distance (E5) from the rotor center point (P) to the first squirrel-cage induction stator assembly (112) is less than the sixth distance (E6) from the rotor center point (P) to the second squirrel-cage induction stator assembly (114); when the second current is greater than the first current, the rotor center point (P) moves toward the second squirrel-cage induction stator assembly (114) such that the third distance (E3) from the rotor center point (P) to the second squirrel-cage induction stator assembly (114) is less than the fourth distance (E4) from the rotor center point (P) to the first squirrel-cage induction stator assembly (112).

3. The circuit board vibration air-floating shaft drilling machine as described in claim 1, characterized in that: It also includes, An air flotation assembly (130) is disposed around the floating shaft (120) and includes a first air flotation bearing (132) and a movable space (136). The first air bearing (132) is used to introduce gas into the movable space (136), and it has an inner bearing ring diameter (B1) in the horizontal direction (D2). The floating pivot (120) includes a first pivot portion (124) extending along the vertical direction (D1), the first pivot portion (124) having a pivot diameter (B2). The inner ring diameter (B1) of the bearing is larger than the diameter of the shaft (B2) so that the floating shaft (120) is suspended in the movable space (136).

4. The circuit board vibration air-floating shaft drilling machine as described in claim 3, characterized in that: The air flotation assembly (130) further includes a second air flotation bearing (134) disposed on one side of the first air flotation bearing (132), the second air flotation bearing (134) being used to introduce gas into the movable space (136), and having an inner bearing clearance (A1) in the vertical direction (D1). The floating pivot (120) further includes a second pivot portion (126) extending along the horizontal direction (D2), the second pivot portion (126) having a lateral pivot height (A2); Wherein, the bearing inner clearance (A1) is greater than the lateral shaft height (A2).

5. An operating method for a circuit board vibration air-bearing shaft drilling machine, characterized in that, The circuit board vibration air-bearing shaft drilling machine according to any one of claims 1 to 4 includes the following steps: A first current is supplied to the first squirrel-cage induction stator assembly (112), and a second current is supplied to the second squirrel-cage induction stator assembly (114); The difference between the first current and the second current is controlled to drive the rotor center point (P) of the induction rotor assembly (116) to move in the vertical direction (D1), thereby causing the floating shaft (120) to vibrate in the vertical direction (D1).

6. The operating method of the circuit board vibration air-floating shaft drilling machine as described in claim 5, characterized in that: The steps for controlling the current difference include: Adjust the magnitudes of the first current and the second current; when the first current is greater than the second current, drive the rotor center point (P) to move toward the first squirrel-cage induction stator assembly (112); when the second current is greater than the first current, drive the rotor center point (P) to move toward the second squirrel-cage induction stator assembly (114).

7. The operating method of the circuit board vibration air-floating shaft drilling machine as described in claim 6, characterized in that: When the first current is equal to the second current, the first distance (E1) from the rotor center point (P) to the first squirrel-cage induction stator assembly (112) is equal to the second distance (E2) from it to the second squirrel-cage induction stator assembly (114).

8. The operating method of the circuit board vibration air-bearing shaft drilling machine as described in any one of claims 5 to 7, characterized in that: Before driving the floating shaft (120) to vibrate, the following steps are also included: Gas is introduced into the movable space (136) surrounding the floating shaft (120) through the air flotation assembly (130), thereby suspending the floating shaft (120).

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