Clamping mechanism for micro drill point machining and machining equipment

Abstract

The invention belongs to the technical field of machining equipment accessories, and discloses a clamping mechanism for micro drill point machining, which comprises a telescopic part connected with a driving mechanism, swing parts are symmetrically mounted at the upper end of the telescopic part, a clamping opening is formed by the output ends of the two symmetrical swing parts, and a matching part is arranged in the middle area of the swing parts; the invention further correspondingly discloses machining equipment of the clamping mechanism for machining the micro drill point, and aims at solving the problems that after an existing straight clamping device and a clamping jaw are fixedly installed, external force needs to be provided externally to open or close the clamping jaw, in the process, the position of the straight clamping device can be slightly changed, and therefore the positioning precision of the micro drill point and the quality of machined products are affected. According to the structure, no external force is input, so that in the process that the straight clamping device deforms to clamp the micro drill point, the external force borne by the straight clamping device is very small and can be ignored, the straight clamping device is not prone to moving, better micro drill point positioning precision can be provided, and the quality of a machined product is guaranteed.

Description

Technical Field

[0001] This invention belongs to the technical field of processing equipment accessories, specifically relating to a clamping mechanism and processing equipment for micro drill bit processing. Background Technology

[0002] In modern precision manufacturing, such as electronic chip manufacturing and precision medical device processing, micro drills are widely used as key machining tools for machining tiny holes. Micro drills typically have a diameter between 0.05 and 1 mm, and due to their extremely small size, the clamping mechanism requires very high precision during machining.

[0003] Currently, existing micro drill bit machining commonly uses a straightener to fix the jaws and clamp the slender head of the micro drill bit to ensure machining accuracy. However, after the straightener is fixedly installed with the jaws, an external force is required to open or close the jaws. This process causes a slight change in the position of the straightener, which affects the positioning accuracy of the micro drill bit and the quality of the machined product.

[0004] In conclusion, developing a clamping mechanism and processing equipment for micro-drill bit processing that can improve clamping accuracy and stability, and efficiently coordinate with various components of the processing equipment, has become an urgent problem to be solved in the field of precision manufacturing. Summary of the Invention

[0005] In view of the problems mentioned in the background art above, the purpose of the present invention is to provide a clamping mechanism and processing equipment for micro drill bit processing.

[0006] To achieve the above-mentioned technical objectives, the technical solution adopted by the present invention is as follows: A clamping mechanism for micro drill bit processing includes a telescopic part connected to a drive mechanism. The telescopic part is W-shaped. A swing part is symmetrically mounted on the upper end of the telescopic part. The swing part is C-shaped. The output ends of the two symmetrical swing parts form a clamping port. The other ends of the two swing parts form an opening. The middle area between the two swing parts is a mating part. A positioning hole is provided at the center of the mating part. A first through deformation groove, two second through deformation grooves, and a third through deformation groove are provided between the two swinging parts and the mating part. The first through deformation groove is located directly above the opening, and the third through deformation groove is positioned relative to the first through deformation groove. The two second through deformation grooves are located on both sides of the first through deformation groove and the third through deformation groove. A first deformation rib is formed between the first through deformation groove and the second through deformation groove, and a second deformation rib is formed between the third through deformation groove and the second through deformation groove. A first oblique opening is provided between the first deformation rib and the second through deformation groove, and a second oblique opening is provided between the second through deformation groove and the swinging part.

[0007] A processing device includes the aforementioned clamping mechanism for micro drill bit processing.

[0008] Furthermore, the swinging part is provided with multiple mounting holes on both sides of the clamping opening.

[0009] Furthermore, the bottom of the clamping opening is connected to the third through deformation groove.

[0010] Furthermore, the clamping surface of the clamping port is provided with an anti-slip coating, which is a composite coating of polytetrafluoroethylene and corundum, with a thickness of 0.1 to 0.3 mm.

[0011] Furthermore, the ends of the first through-hole deformation groove, the second through-hole deformation groove, and the third through-hole deformation groove are set to be arc-shaped, and the tangent direction of the arc is the same as the stress direction.

[0012] Further specified, stress relief holes are provided at the ends of the first through deformation groove, the second through deformation groove and the third through deformation groove.

[0013] Furthermore, a positioning hole is provided at the center of the mating part.

[0014] The beneficial effects of using the present invention are as follows: This invention features a drive mechanism at the bottom of the telescopic section. An external pressure source is connected to the opening of the cylinder. When no force is applied, the clamping hole opens. During operation, the drive mechanism pushes outward to compress the telescopic section. The movement of the telescopic section causes the straightener to deform, which in turn causes the clamping end of the swinging part to close and clamp the micro-drill bit. Then, the micro-drill bit is processed. After processing, the push rod moves downward to its initial position and no longer pushes the telescopic section. The corresponding clamping end of the swinging part returns to its initial state. Because there is no external force input, the external force on the straightener itself is very small and negligible during the process of the straightener deforming and clamping the micro-drill bit. Therefore, the straightener itself is not easy to move, which can provide better positioning accuracy of the micro-drill bit and ensure the quality of the processed product. Attached Figure Description

[0015] The present invention can be further illustrated by the non-limiting embodiments given in the accompanying drawings; Figure 1 This is a front view schematic diagram of an embodiment of a clamping mechanism and processing equipment for micro drill bit processing according to the present invention; Figure 2 This is a schematic diagram of an embodiment of a clamping mechanism and processing equipment for micro drill bit processing according to the present invention; Figure 3 This is a schematic diagram of the structure with stress relief holes in an embodiment of a clamping mechanism and processing equipment for micro drill bit processing according to the present invention; The symbols for the main components are explained below: 1. Telescopic part; 2. Swinging part; 3. Clamping port; 4. Fitting part; 5. Mounting hole; 6. Stress relief hole; 7. Positioning hole; Opening 101; First through deformation groove 401; second through deformation groove 402; third through deformation groove 403; first deformation rib 404; second deformation rib 405; first oblique opening 406; second oblique opening 407. Detailed Implementation

[0016] To enable those skilled in the art to better understand the present invention, the technical solution of the present invention will be further described below in conjunction with the accompanying drawings and embodiments. Example 1:

[0017] like Figures 1-3 As shown, a clamping mechanism for micro drill bit processing according to the present invention includes a telescopic part 1 connected to a drive mechanism. The telescopic part 1 is W-shaped. A swing part 2 is symmetrically mounted on the upper end of the telescopic part 1. The swing part 2 is C-shaped. The output ends of the two symmetrical swing parts 2 form a clamping port 3. The other ends of the two swing parts 2 form an opening 101. The middle area of ​​the two swing parts 2 is a mating part 4. A positioning hole 7 is provided at the center of the mating part 4. Between the two swing parts 2 and the mating part 4, there is a first through deformation groove 401, two second through deformation grooves 402 and a third through deformation groove 403. The first through deformation groove 401 is located directly above the opening 101. The third through deformation groove 403 is positioned relative to the first through deformation groove 401. The two second through deformation grooves 402 are located on both sides of the first through deformation groove 401 and the third through deformation groove 403. A first deformation rib 404 is formed between the first through deformation groove 401 and the second through deformation groove 402. A second deformation rib 405 is formed between the third through deformation groove 403 and the second through deformation groove 402. A first oblique opening 406 is provided between the first deformation rib 404 and the second through deformation groove 402. A second oblique opening 407 is provided between the second through deformation groove 402 and the swing part 2.

[0018] In this embodiment, the positioning hole 7 is used to limit the position of the mating part 4. When the drive mechanism drives the telescopic part 1 to move towards the clamping port 3, it forces the two swing parts 2 to move in opposite directions, so that the clamping port 3 is opened. The design of the first through deformation groove 401, the second through deformation groove 402 and the third through deformation groove 403 allows the swing parts 2 to have room to move. The through deformation groove is preferably set as U-shaped. When the slender head of the micro drill bit enters the clamping port 3, the drive mechanism no longer pushes the telescopic part 1, and the clamping end of the corresponding swing part 2 returns to the initial open state. Because there is no external force input, the external force on the straightener itself is very small and can be ignored during the process of the straightener deforming and clamping the micro drill bit. Therefore, the straightener itself is not easy to move, which can provide better micro drill bit positioning accuracy and ensure the quality of the processed product. During the swinging process, the first through deformation groove 401, the second through deformation groove 402 and the third through deformation groove 403 can all provide space for deformation. The first oblique opening 406 and the second oblique opening 407 are both located in the second through deformation groove 402, giving the second through deformation groove 402 a larger deformation space, thereby ensuring the swinging distance of the swinging part 2.

[0019] Simply connect and install this clamping mechanism onto the processing equipment, and it is ready for use. Example 2:

[0020] like Figure 1 , Figure 2As shown, the swing part 2 has multiple mounting holes 5 on both sides of the clamping opening 3. These mounting holes 5 are symmetrically distributed in an array along the length of the swing part 2. The axis of each mounting hole 5 is parallel to the central axis of the clamping opening 3, and the spacing between adjacent mounting holes 5 is set to be equal according to the specifications of common clamping adjustment components (such as adjusting bolts, positioning pins, elastic clamping components, etc.). During actual assembly, different mounting holes 5 can be selected for the installation of auxiliary clamping and adjusting components based on the diameter of the micro drill bit and the processing requirements. For example, when clamping a thinner micro drill bit, a short-stroke clamping and adjusting auxiliary component can be installed in the mounting hole 5 near the end of the clamping opening 3 to achieve fine control of the clamping force. Conversely, when clamping a thicker micro drill bit… Long-stroke clamping adjustment components can be installed in the mounting holes 5, which are far from the clamping opening 3, providing greater deformation space for the clamping arm and expanding its adaptability. The design of multi-position mounting holes 5 enables selective assembly of the clamping adjustment components, allowing the swing part 2 to adapt to micro drill bits of different diameters and materials, greatly improving the versatility of the clamping mechanism. Furthermore, the symmetrically distributed mounting holes 5 ensure that the adjustment force is applied evenly on both sides of the clamping opening 3, avoiding coaxiality errors caused by force offset of the micro drill bit and improving clamping accuracy. In addition, the array layout reserves installation space for subsequent functional expansion. For example, additional auxiliary support components or sensors can be installed to further enhance clamping stability and controllability of the processing. In fact, the number, shape, and relative position of the mounting holes 5 can also be considered according to specific circumstances. Example 3:

[0021] For example, 1. Figure 2As shown, the bottom of the clamping port 3 is connected to the third through deformation groove 403. The clamping port 3 has a through groove structure. Furthermore, its inner sidewall can be set as an arc-shaped surface adapted to the outer wall of the micro drill bit. The bottom center position is connected to the third through deformation groove 403 through a connecting groove with a width smaller than the diameter of the clamping port 3. When the micro drill bit is inserted into the clamping port 3, the sidewall of the clamping port 3 is compressed and undergoes elastic deformation. This deformation is transmitted to the third through deformation groove 403 through the bottom connecting structure, causing the two arms of the U-shaped groove to expand slightly outward. With the help of the elastic restoring force of the groove, it acts in the opposite direction on the clamping port 3, forming an adaptive clamping force on the micro drill bit. The deformation characteristics of 403 provide ample elastic buffer space for the clamping port 3, avoiding damage to the micro drill bit caused by rigid clamping, especially suitable for ultra-fine micro drill bits with a diameter ≤0.1mm; the connecting structure allows the clamping force to be evenly distributed through the through deformation groove, reducing local stress concentration in the clamping port 3 and extending the service life of the mechanism; the elastic restoring force of the third through deformation groove 403 can be automatically adjusted according to the change of micro drill bit diameter, adapting to a certain range of needle diameter differences without additional adjustment components, improving the self-adaptability and ease of operation of the clamping mechanism. In fact, the width of the connecting groove between the clamping port 3 and the third through deformation groove 403 can also be considered according to specific circumstances. Example 4:

[0022] like Figure 1 , Figure 2 As shown, the clamping surface of the clamping port 3 is provided with an anti-slip coating, which is a composite coating of polytetrafluoroethylene (PTFE) and corundum, with a thickness of 0.1–0.3 mm. First, the clamping surface of the clamping port 3 is roughened by sandblasting to remove the surface oxide layer and form an adhesion substrate with a roughness Ra of 3.2–6.3 μm. Then, a plasma spraying process is used to uniformly coat the clamping surface with a mixture of PTFE and corundum powder, with the coating thickness controlled at 0.1–0.3 mm. The corundum particles are uniformly embedded in the PTFE material. Finally, a curing treatment is performed to form a coating that adheres to the clamping surface. The metallurgical combination of polytetrafluoroethylene (PTFE) and diamond particles significantly increases the coefficient of friction, effectively suppressing axial slippage of the micro-drill bit during high-speed rotation. The 0.1–0.3 mm thickness design ensures anti-slip effect without affecting the elastic deformation response of the clamping opening 3 due to excessive coating thickness. The composite coating is wear-resistant and coolant corrosion-resistant, maintaining stable anti-slip performance after nearly 5,000 clamping cycles, extending the maintenance cycle of the clamping mechanism. In practice, anti-slip measures and coating material selection can also be considered according to specific circumstances. Example 5:

[0023] like Figure 1 , Figure 2As shown, the ends of the first through-type deformation groove 401, the second through-type deformation groove 402, and the third through-type deformation groove 403 are arc-shaped, with the tangent direction of the arc being the same as the stress direction. The radius of curvature of the arc is 1.5 to 2 times the width of the groove, and the arc surface can be further polished. The arcs at the ends of the first through-type deformation groove 401 and the second through-type deformation groove 402 extend along the swing direction of the clamping arm, while the arc at the end of the third through-type deformation groove 403 is radially distributed along the clamping opening 3, ensuring that the arc direction perfectly matches the principal stress direction when the groove is deformed. The arc-shaped structure can reduce the stress concentration factor at the end of the groove, avoid the groove cracking caused by stress abrupt changes during deformation, and significantly improve the fatigue resistance of the clamping mechanism. Moreover, the arc-shaped design, which is consistent with the stress direction, can guide the deformation force to be transmitted along the preset path, so that the deformation of the three U-shaped grooves is coordinated and synchronized, ensuring that the clamping port 3 is subjected to balanced force and reducing the clamping wobble of the micro drill bit. Furthermore, if it has been smoothed, the arc-shaped surface can reduce the probability of machining debris accumulation, while reducing cleaning dead corners and improving the ease of maintenance of the mechanism. In fact, the specifications and dimensions of the arc can also be considered according to specific circumstances. Example 6:

[0024] like Figure 3 As shown, stress relief holes 6 are provided at the ends of the first through-type deformation groove 401, the second through-type deformation groove 402, and the third through-type deformation groove 403. Circular stress relief holes 6 are drilled perpendicular to the length of the groove at the end of the arc-shaped transition structure at the end of each through-type deformation groove, i.e., at the corner of the groove bottom where stress easily accumulates. The diameter of the hole is 0.8 to 1.2 times the width of the groove, and the hole depth penetrates the sidewall of the groove and communicates with the interior of the groove. The stress relief holes 6 of the first through-type deformation groove 401 and the second through-type deformation groove 402 are arranged along the thickness direction of the clamping arm, while the stress relief holes 6 of the third through-type deformation groove 403 are arranged radially along the clamping opening 3. Furthermore, electrolytic polishing is performed on the hole walls to avoid… To avoid secondary stress concentration, the stress relief hole 6 can absorb the residual stress generated during the deformation of the groove through its own spatial structure, reducing the peak stress at the end. Combined with the arc transition, it further improves the crack resistance of the structure. Moreover, the connection design between the hole and the groove can provide additional buffer space for deformation, expanding the elastic deformation range of the U-shaped groove and enhancing the adaptability of the clamping mechanism to micro drill bits of different specifications. Furthermore, the stress relief hole 6 can serve as a cleaning channel, facilitating the removal of debris accumulated in the groove through high-pressure airflow or cleaning agents, maintaining the stability of the groove deformation. In fact, the detailed treatment of the first through deformation groove 401, the second through deformation groove 402, and the third through deformation groove 403 can also be considered according to specific circumstances.

[0025] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in the present invention should still be covered by the claims of the present invention.

Claims

1. A clamping mechanism for micro drill bit machining, comprising a telescopic part (1) connected to a drive mechanism, characterized in that: The telescopic part (1) is symmetrically equipped with a swing part (2) at its upper end. The output ends of the two symmetrical swing parts (2) form a clamping port (3). The other ends of the two swing parts (2) form an opening (101). The middle area of ​​the two swing parts (2) is a mating part (4). The center of the mating part (4) is provided with a positioning hole (7). A first through-deformation groove (401), two second through-deformation grooves (402), and a third through-deformation groove (403) are provided between the two swing parts (2) and the mating part (4). The first through-deformation groove (401) is located directly above the opening (101), and the third through-deformation groove (403) is positioned relative to the first through-deformation groove (401). The two second through-deformation grooves (402) are located between the first through-deformation groove (401) and the third through-deformation groove (403). On both sides of the third through deformation groove (403), a first deformation rib (404) is formed between the first through deformation groove (401) and the second through deformation groove (402), and a second deformation rib (405) is formed between the third through deformation groove (403) and the second through deformation groove (402). A first oblique opening (406) is provided between the first deformation rib (404) and the second through deformation groove (402), and a second oblique opening (407) is provided between the second through deformation groove (402) and the swing part (2).

2. The clamping mechanism for micro drill bit machining according to claim 1, characterized in that: The swing part (2) has multiple mounting holes (5) on both sides of the clamping port (3).

3. The clamping mechanism for micro drill bit machining according to claim 1, characterized in that: The bottom of the clamping port (3) is connected to the third through deformation groove (403).

4. The clamping mechanism for micro drill bit machining according to claim 1, characterized in that: The clamping surface of the clamping port (3) is provided with an anti-slip coating, which is a composite coating of polytetrafluoroethylene and corundum with a thickness of 0.1 to 0.3 mm.

5. The clamping mechanism for micro drill bit machining according to claim 1, characterized in that: The ends of the first through-hole deformation groove (401), the second through-hole deformation groove (402) and the third through-hole deformation groove (403) are set to be arc-shaped, and the tangent direction of the arc is the same as the stress direction.

6. The clamping mechanism for micro drill bit machining according to claim 1, characterized in that: The ends of the first through deformation groove (401), the second through deformation groove (402) and the third through deformation groove (403) are all provided with stress relief holes (6).

7. A processing equipment, characterized in that: Includes any one of the micro drill bit machining clamping mechanisms as described in claims 1 to 6.

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