Monolithic pcd micro-diameter drill bit

Abstract

The utility model relates to mechanical processing tool technical field discloses a kind of integral PCD micro-diameter drill bits. Drill bit includes drill string, drill tip and the connecting rod of fixed connection two, connecting rod outside integrated has protection mechanism. The protection mechanism includes the connecting ring of sliding sleeve in the connecting rod, the rotating rod articulated in the outside of connecting ring, the support bone articulated in the circumference of drill string and the protective cover fixed in the outside of support bone. One end of rotating rod is connected with connecting ring, and the other end is connected with support bone. By pushing connecting ring along the axial sliding of connecting rod, support bone is driven to open outward or be gathered inward using connecting rod linkage principle, to drive flexible protective cover to form umbrella-like shelter structure. The utility model solves the problem that micro-diameter drilling chips splash and lack portable protection, with compact structure, high degree of integration, easy to operate and good protection effect, ensure operation safety and environmental cleanliness.

Description

Technical Field

[0001] This utility model relates to the field of machining tool technology, and in particular to an integral PCD micro-diameter drill bit. Background Technology

[0002] PCD (polycrystalline diamond) micro-drills are widely used in precision manufacturing industries such as electronics, automotive, and aerospace due to their extremely high hardness, wear resistance, and good thermal conductivity. They are particularly suitable for micro-hole machining of high-hardness or composite materials. In actual drilling operations, to ensure machining efficiency and hole wall smoothness, micro-drills typically need to contact and cut the workpiece at extremely high speeds.

[0003] However, the high-speed rotation of the drill bit during cutting generates a large amount of fine chips after the workpiece material is removed. Due to the extremely high rotation speed of the drill bit, these chips often do not fall naturally under the influence of enormous centrifugal force, but instead scatter radially around the drill bit at extremely high speeds. Most existing micro-diameter drill bit structures only include a drill string for clamping and a drill tip for cutting, lacking integrated protective measures for the drill body.

[0004] This structural deficiency means that in operating environments without a large, enclosed external machine tool enclosure, high-speed flying chips not only scatter across the worktable and surrounding floor, causing environmental pollution and increasing subsequent cleanup burdens, but more seriously, the flying particles can easily hit the operator's hands, face, and even eyes, posing a serious safety hazard. Although this problem can be solved by installing an additional independent external protective cover, external devices are often bulky, cumbersome to install, and inconvenient to carry, failing to meet the need for flexible and immediate protection of the drill bit itself.

[0005] Therefore, this utility model proposes an integral PCD micro-diameter drill bit to overcome the shortcomings of the prior art. Utility Model Content

[0006] In view of the fact that existing PCD micro-diameter drill bits lack built-in protective structures during high-speed drilling operations, the cutting chips generated are easily scattered in all directions, causing pollution to the working environment and posing a threat to the safety of operators. In addition, existing external protective devices are cumbersome to install, inconvenient to carry, and cannot provide immediate and flexible protection. This utility model aims to provide an integral PCD micro-diameter drill bit with an improved structure that can effectively solve the above problems.

[0007] This utility model provides an integral PCD micro-diameter drill bit, comprising: a drill string and a drill tip disposed at one end of the drill string; it also includes a connecting rod disposed between the drill string and the drill tip, and a protective mechanism integrated in the area of ​​the connecting rod.

[0008] The core components of the protective mechanism include a connecting ring slidably connected to the outside of the connecting rod, a rotating rod rotatably connected to the outer wall of the connecting ring, a support bone rotatably connected to the outer wall of the drill string, and a protective cover fixed to the outside of the support bone.

[0009] Furthermore, the drill string and the drill tip are connected by a connecting rod to form an integrated structure. The connecting ring is slidably sleeved on the outer circumferential surface of the connecting rod through an inner hole, and can reciprocate along the axial direction of the connecting rod. The connecting ring and the support bone form a linkage structure through the rotating rod. Specifically, one end of the rotating rod is hinged to the connecting ring, and the other end is hinged to the support bone. The root of the support bone is hinged to the drill string. When the connecting ring is pushed to slide along the connecting rod, the rotating rod drives the support bone to expand outward or contract inward, thereby causing the protective cover fixed on the support bone to open or close synchronously.

[0010] Preferably, the structural details of the connecting rod are further designed such that its diameter is smaller than that of the drill string, and the connecting rod is coaxial with the drill string and the drill tip. This stepped shaft design not only provides space for the installation and sliding of the connecting ring, but also helps to optimize the weight distribution and rotational balance of the overall drill bit.

[0011] Preferably, the connection between the connecting ring and the connecting rod is designed as a clearance fit, allowing the connecting ring to slide smoothly back and forth along the axial direction of the connecting rod, ensuring that the operator can easily change the state of the protective mechanism by pushing the connecting ring without any jamming.

[0012] Preferably, the connection method between the rotating rod and the related components is specified as follows: one end of the rotating rod is rotatably connected to the outer wall of the connecting ring through a first pin, and the other end of the rotating rod is rotatably connected to the middle or end of the supporting bone through a second pin. The pin connection ensures both the flexibility of rotation and provides sufficient structural strength to withstand the force during the opening and closing process.

[0013] Preferably, the support bones are arranged in a uniformly spaced manner along the circumference of the drill string, and the end of the support bone near the drill string is rotatably connected to the bottom edge area of ​​the drill string through a hinge seat. The uniformly distributed support bones can ensure that the protective cover forms a regular and stable geometric shape after being deployed, avoiding deformation or vibration caused by uneven force.

[0014] Preferably, the protective cover is made of a flexible material, and the edges of the protective cover are fixed to each of the supporting bones in sequence. Utilizing the foldable properties of the flexible material, when the supporting bones are opened, the protective cover is stretched and forms an umbrella-shaped or cone-shaped structure, thereby providing a large area of ​​shielding and protection.

[0015] Preferably, the drill string, the connecting rod, and the drill tip are manufactured using an integral molding structure, and the drill tip is made of polycrystalline diamond (PCD) composite material. The integral molding ensures the overall rigidity and concentricity of the tool, while the PCD material ensures the ultra-high hardness and wear resistance of the drill bit in micro-diameter machining.

[0016] Preferably, the outer surface of the connecting ring is provided with anti-slip texture or protrusions to increase the friction during operation, so that the operator can still apply force to push the connecting ring steadily even when the hands are oily or gloves are worn.

[0017] This utility model has the following beneficial effects:

[0018] 1. This utility model solves the problem that existing micro-diameter drill bits easily scatter flying debris in all directions and lack portable protective measures when operating at high speed by integrating a linkage opening and closing mechanism consisting of a connecting ring, a rotating rod and a supporting bone on the connecting rod between the drill string and the drill tip. It achieves the technical effect of quickly unfolding or retracting the protective cover with only a simple push and pull action, effectively blocking flying debris, protecting the safety of operators and keeping the working environment clean.

[0019] 2. This utility model solves the problems of cumbersome installation, inconvenient carrying, and easy loss when separated from the drill bit body by designing the connecting ring to slide on the outer circumference of the connecting rod and using the rotating rod to connect the ring and the support bone. It achieves the technical effect of compact structure, high degree of integration, and labor-saving opening and closing by using the linkage principle, thus improving the preparation efficiency and convenience of drilling operations.

[0020] 3. This utility model solves the problems of rigid protective covers being limited in small spaces and easily causing visual obstruction by using flexible materials to make protective covers and fixing them to the outside of multiple evenly distributed support bones. It achieves the technical effect of the protective cover being small in size and not interfering with operation when folded, and forming a large umbrella-shaped coverage when unfolded, thus taking into account both the flexibility and protection of micro-diameter drilling. Attached Figure Description

[0021] Figure 1 This is a three-dimensional schematic diagram of an integral PCD micro-diameter drill bit proposed in this utility model;

[0022] Figure 2 This is a schematic diagram of the structure of a protective cover for an integral PCD micro-diameter drill bit proposed in this utility model.

[0023] Legend:

[0024] 1. Drill string; 2. Drill tip; 3. Support bone; 4. Rotating rod; 5. Connecting ring; 6. Protective cover; 7. Connecting rod. Detailed Implementation

[0025] Example:

[0026] Reference Figure 1 and Figure 2 This utility model provides an integral PCD micro-diameter drill bit, which aims to solve the structural defects of existing micro-diameter drill bits, which generate flying chips that easily splash around during drilling operations, not only polluting the working environment but also posing safety hazards to operators.

[0027] like Figure 1 and Figure 2 As shown, the integral PCD micro-diameter drill bit includes a drill string 1 as the main clamping and transmission component, and a drill tip 2 disposed at one end of the drill string 1 for cutting the workpiece. The drill string 1 is used to insert into the chuck of an external drilling device to fix it and receive the rotational driving force. The drill tip 2 is preferably made of polycrystalline diamond (PCD) composite sheet to provide high hardness and wear resistance.

[0028] A connecting rod 7 is fixedly connected between the drill string 1 and the drill tip 2. The drill string 1, the connecting rod 7 and the drill tip 2 are preferably integrally molded to ensure the overall structural strength and rotational concentricity. The diameter of the connecting rod 7 is designed to be smaller than the diameter of the drill string 1, and the connecting rod 7, the drill string 1 and the drill tip 2 are coaxially arranged. This stepped shaft structure ensures the transmission of cutting force, and the diameter difference between the connecting rod 7 and the drill string 1 forms a receiving space for installing a protective component that can be opened and closed as needed.

[0029] A protective mechanism for physically blocking flying debris is integrated in the outer area of ​​the connecting rod 7. The protective mechanism mainly includes a connecting ring 5 that slides on the outer circumferential surface of the connecting rod 7, a rotating rod 4 that is linked to the outer wall of the connecting ring 5, and a support bone 3 that is hinged to the bottom area of ​​the drill string 1. The connecting ring 5 serves as the active driving component of the entire protective mechanism and can slide back and forth along the axial direction of the connecting rod 7. The state switching of the protective mechanism is controlled by changing its position.

[0030] Reference Figure 1 and Figure 2 The connecting ring 5 serves as a driving element, and its inner hole is clearance-fitted with the outer circumferential surface of the connecting rod 7, allowing the connecting ring 5 to move flexibly on the connecting rod 7 without jamming. The outer surface of the connecting ring 5 is preferably provided with anti-slip textures or protrusions to increase the friction when the fingers are flicking, making it easier for the operator to apply force. The outer wall of the connecting ring 5 is provided with multiple hinge points evenly spaced along the circumference. One end of the rotating rod 4 is rotatably connected to the outer wall of the connecting ring 5 through the first pin. The rotating rod 4 moves with the connecting ring 5 and can be deflected at an angle relative to the connecting ring 5.

[0031] Meanwhile, multiple hinge seats are provided at the bottom edge of the drill string 1. The end of the support bone 3 near the drill string 1 is rotatably connected to the drill string 1 through the hinge seat, serving as the fixed fulcrum of the entire protective structure. The other end of the support bone 3 extends towards the drill tip 2. The other end of the rotating rod 4 away from the connecting ring 5 is rotatably connected to the middle or end of the support bone 3 through the second pin. Thus, a linkage mechanism similar to the principle of umbrella rib opening is formed between the connecting ring 5, the rotating rod 4, the support bone 3 and the drill string 1.

[0032] In the assembled state, when protection is required, the connecting ring 5 is pushed to slide along the connecting rod 7 towards the drill tip 2. The connecting ring 5 drives the rotating rod 4 to move. The rotating rod 4, as a connecting rod, converts the axial thrust into a lateral thrust on the support bone 3, forcing the support bone 3 to flip and open outward around its hinge point on the drill string 1. This linkage structure ensures the continuity and synchronicity of the opening and closing action of the protective mechanism, so that the operator only needs to move the connecting ring 5 with one hand to complete the unfolding action of the entire protective frame, providing stable frame support for the subsequent opening of the protective cover 6.

[0033] In a preferred embodiment, in order to effectively block and collect the flying chips generated during drilling, the protective cover 6 is fixedly connected to the outside of multiple support bones 3. The protective cover 6 is preferably made of a flexible material, such as high-strength nylon cloth, rubber cloth, or transparent soft plastic sheet. The edges of the protective cover 6 are fixed to each support bone 3 in sequence. When the support bone 3 is in a retracted state, the protective cover 6 is folded and fits close to the drill string 1. When the support bone 3 is stretched open by force, the protective cover 6 is stretched and unfolded to form an umbrella-shaped or cone-shaped structure. The structure can cover the drilling area like an umbrella, forming a semi-enclosed isolation space.

[0034] As another preferred embodiment, in order to improve drilling accuracy and tool life, the design of the connecting rod 7 having a smaller diameter than the drill string 1 not only provides sliding space for the connecting ring 5, but also optimizes the overall weight distribution. Furthermore, the drill string 1, connecting rod 7, and drill tip 2 are manufactured as a single piece, eliminating assembly errors between components. The drill tip 2 is partially inlaid or welded with polycrystalline diamond (PCD) composite sheets. By utilizing the extremely high hardness and thermal conductivity of PCD material, it is ensured that the micro-diameter drill bit can maintain its sharpness and reduce wear when cutting hard materials at high speed.

[0035] In another preferred embodiment, in order to ensure that the protective cover 6 has a regular shape and uniform stress after unfolding, multiple support bones 3 are evenly distributed around the drill string 1, for example, three, four or more. The even distribution of support bones 3 makes the protective cover 6 appear as a regular polygonal pyramid or cone after unfolding, avoiding deformation of the protective cover 6 caused by eccentric loading or the dynamic balance effect on the rotation of the drill bit. The hinge seat structure used at the connection between the support bone 3 and the drill string 1 ensures that the support bone 3 can only rotate in the radial plane, restricting its axial displacement and further enhancing the structural stability.

[0036] The working principle is as follows:

[0037] When drilling is required, the operator first inserts the drill string 1 into the chuck of the external drilling equipment for secure installation. At this time, the protective mechanism is in the retracted state, the support bone 3 is attached to the connecting rod 7 and the drill string 1, and the protective cover 6 is folded and stored without affecting the drill tip 2's alignment with the workpiece. When drilling is about to begin and the protective function needs to be activated, the operator manually pushes the connecting ring 5.

[0038] After the connecting ring 5 is subjected to axial thrust, it slides towards the drill tip 2 on the outer surface of the connecting rod 7. The movement of the connecting ring 5 causes the rotating rod 4, which is hinged to its outer side, to move accordingly. Since the other end of the rotating rod 4 is hinged to the support bone 3, and the root of the support bone 3 is hinged to the drill string 1, the rotating rod 4, like a push rod, converts the linear motion of the connecting ring 5 into a thrust on the support bone 3, forcing the support bone 3 to flip and open outward around its root hinge seat.

[0039] As multiple supporting bones 3 expand simultaneously, the flexible protective cover 6 fixed on its outer side is stretched and unfolded, eventually forming an umbrella-like shielding structure above the drill tip 2. Then, the drilling equipment is started, the drill tip 2 rotates and cuts into the workpiece, and the flying chips generated by high-speed drilling are physically blocked by the protective cover 6 above, preventing them from splashing in all directions. Instead, they are confined inside the protective cover 6 or fall naturally under gravity, thus effectively protecting the safety of the operator and keeping the working environment clean. After the operation is completed, the mechanism can be reset and retracted by turning the connecting ring 5 in the opposite direction.

Claims

1. An integral PCD micro-diameter drill bit, comprising: Drill string (1), and A drill tip (2) is disposed at one end of the drill string (1); The feature is that a connecting rod (7) is fixedly connected between the drill string (1) and the drill tip (2), and a connecting ring (5) is slidably connected to the outside of the connecting rod (7); The drill string (1) is rotatably connected to a plurality of support bones (3) on its outer circumference. The end of the support bone (3) near the drill string (1) rotates on the drill string (1) through a hinge structure. The outer wall of the connecting ring (5) is rotatably connected to a plurality of rotating rods (4), and the number of rotating rods (4) corresponds one-to-one with the number of supporting bones (3); The end of the rotating rod (4) away from the connecting ring (5) is rotatably connected to the corresponding supporting bone (3); The outer sides of the plurality of support bones (3) are fixedly connected to the inner side of the protective cover (6). When the connecting ring (5) slides along the connecting rod (7), the supporting bone (3) is driven to open outward by the rotating rod (4) to open the protective cover (6), or to close the protective cover (6).

2. The integral PCD micro-diameter drill bit according to claim 1, characterized in that, The diameter of the connecting rod (7) is smaller than the diameter of the drill string (1), and the connecting rod (7) is coaxial with the drill string (1) and the drill tip (2).

3. The integral PCD micro-diameter drill bit according to claim 1, characterized in that, The inner hole of the connecting ring (5) and the outer circumferential surface of the connecting rod (7) are fitted with a clearance, and the connecting ring (5) can slide back and forth along the axial direction of the connecting rod (7).

4. The integral PCD micro-diameter drill bit according to claim 1, characterized in that, One end of the rotating rod (4) is rotatably connected to the outer wall of the connecting ring (5) via a first pin, and the other end of the rotating rod (4) is rotatably connected to the middle or end of the supporting bone (3) via a second pin.

5. The integral PCD micro-diameter drill bit according to claim 1, characterized in that, The plurality of support bones (3) are evenly spaced along the circumference of the drill string (1), and the end of the support bone (3) near the drill string (1) is rotatably connected to the bottom edge region of the drill string (1) through a hinge seat.

6. The integral PCD micro-diameter drill bit according to claim 1, characterized in that, The protective cover (6) is made of flexible material, and the edges of the protective cover (6) are fixed to each of the supporting bones (3) in sequence. When the supporting bones (3) are opened, the protective cover (6) forms an umbrella-shaped or cone-shaped structure.

7. The integral PCD micro-diameter drill bit according to claim 1, characterized in that, The drill string (1), the connecting rod (7) and the drill tip (2) are integrally formed, and the material of the drill tip (2) includes polycrystalline diamond (PCD) composite sheet.

8. The integral PCD micro-diameter drill bit according to claim 1, characterized in that, The outer surface of the connecting ring (5) is provided with anti-slip textures or protrusions to increase friction during operation.

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