CN216912220U

CN216912220U - PCD micro-drill

Info

Publication number: CN216912220U
Application number: CN202122495086.8U
Authority: CN
Inventors: 张鹏飞; 李志尧; 张榅桲; 张海斌
Original assignee: Zhengzhou Diamond Precision Manufacturing Co Ltd
Current assignee: Zhengzhou Diamond Precision Manufacturing Co Ltd
Priority date: 2021-10-18
Filing date: 2021-10-18
Publication date: 2022-07-08
Anticipated expiration: 2031-10-18

Abstract

The utility model belongs to the technical field of drilling machining, and particularly relates to a PCD (polycrystalline Diamond) micro-drill which comprises a cutter bar and a cutter handle connected with the cutter bar, wherein a PCD cutter head is arranged at the end part of the cutter bar, which is far away from the cutter handle, and a spiral chip groove is formed in the cutter bar; a cutting edge is arranged on the outer diameter of the cutter bar along the chip groove only at the PCD cutter head; a conical core thickness is arranged in the cutter bar, and one end, close to the PCD cutter head, of the core thickness is smaller than one end, close to the cutter handle, of the core thickness. According to the utility model, the cutting edge is arranged on the cutter bar at the position of the PCD cutter head, so that the support between the PCD cutter head and the hole wall is ensured, the problem of rough hole wall caused by too long cutting edge is avoided, and meanwhile, the strength of the cutter bar is improved and the service life is prolonged due to the conical core thickness of the cutter bar.

Description

PCD micro-drill

Technical Field

The utility model belongs to the technical field of drilling machining, and particularly relates to a PCD (polycrystalline Diamond) micro-drill.

Background

While micro-drills generally refer to drill bits having a blade diameter of less than 3.175mm, it is noted that micro-drills generally contemplate PCB drill bits, which are generally tungsten steel type drill bits, for machining micro-holes in circuit boards. The cutting edge is arranged on the micro drill to ensure the support between the outer diameter of the micro drill and the processed hole wall, but the hole wall is rough due to the larger friction force between the cutting edge and the hole wall, and the quality of the hole is reduced.

The prior art discloses a patent application named 'non-margin type PCD drill bit for semiconductor drilling', with an authorization publication number of CN 212170916U and an authorization publication date of 2020.12.18, which comprises a drill rod made of PCD composite materials, wherein a tip angle is formed at the end part of the drill rod, and only a spiral chip removal groove is formed on the drill rod to form a non-margin structure. The problem of large friction force between the drill rod and the hole wall is solved by the drill rod without the cutting edge structure, but the supporting and extruding effects between the drill rod and the hole wall are lost, so that the control force on the axis of the processed hole is insufficient.

SUMMERY OF THE UTILITY MODEL

Aiming at the defects in the prior art, the utility model aims to provide the PCD micro-drill, the cutting edge is arranged on the cutter bar at the position of the PCD cutter head, so that the support between the PCD cutter head and the hole wall is ensured, the problem of rough hole wall caused by too long cutting edge is avoided, meanwhile, the strength of the cutter bar is improved by the conical core thickness in the cutter bar, and the service life is prolonged.

In order to realize the purpose, the technical scheme of the utility model is as follows: a PCD micro drill comprises a cutter bar and a cutter handle connected with the cutter bar, wherein a PCD cutter head is arranged at the end part of the cutter bar, which is far away from the cutter handle, and a spiral chip groove is arranged on the cutter bar; a cutting edge is arranged on the outer diameter of the cutter bar along the chip groove only at the PCD cutter head; the PCD cutter is characterized in that a conical core thickness is arranged in the cutter bar, and one end, close to the PCD cutter head, of the core thickness is smaller than one end, close to the cutter handle, of the core thickness.

Preferably, the linear length of the blade in the axial direction of the tool shank is between 1.5 and 5 times the diameter of the end of the PCD tip.

Preferably, the cutter bar is in a conical mode on the whole, and the end portion, close to the cutter handle, of the cutter bar is smaller than the end portion, close to the PCD cutter head, of the cutter bar.

Preferably, the end part of the cutter bar close to the cutter handle is provided with a connecting part, and the connecting part is embedded in the cutter handle and connected through welding.

Preferably, the axial length of the connection is in the range between 2 and 5 times the diameter of the connection.

Preferably, the tip of the PCD tip is provided with 1-3 apex angles.

Preferably, the apex angle angles decrease in sequence in the direction from the PCD tip to the shank.

Preferably, only the first said apex angle in the direction from the PCD tip to the shank adopts a double clearance angle.

The technical scheme adopted by the utility model has the beneficial effects that:

the utility model adopts the arrangement of partial margin, integrates the advantages of full margin and no margin, ensures that the outer diameter and the hole wall of the micro drill form effective support and extrusion to the hole wall, and also avoids excessive contact of the outer diameter and the hole wall at the rear end of the micro drill. The cutting edge is arranged on the cutter bar only at the position of the PCD cutter head, no cutting edge is arranged at other positions on the cutter bar, the PCD cutter head with the cutting edge and the hole wall form effective support and extrusion on the hole wall, the axis of the hole is accurately controlled, the cutter bar without the cutting edge and the hole wall are not in contact, the friction force is small, and the roughness of the hole wall is not influenced; through set up conical core thick in the cutter arbor, the thick orientation grow gradually of handle of a knife of core to promote the intensity of cutter arbor, prolong the life of this micro drill.

Drawings

FIG. 1 is a schematic overall view of an embodiment of a PCD micro-drill;

FIG. 2 is an enlarged view of FIG. 1 at A;

FIG. 3 is a schematic illustration of an example core thickness design for a PCD micro-drill;

FIG. 4 is an enlarged schematic view of the apex angle of the PCD bit of FIG. 1 at B;

FIG. 5 is a side view schematic of FIG. 4;

FIG. 6 is a schematic view of another embodiment of a PCD micro-drill illustrating a PCD bit apex angle.

In fig. 1-6, 1-handle, 2-connecting part, 3-handle, 31-chip groove, 4-PCD tip, 41-margin, 42-first flank face of first vertex angle, 43-second flank face of first vertex angle, 44-flank face of second vertex angle, 45-flank face of third vertex angle; l1-axial length of the joint, L2-land length; φ D1-the diameter of the joint, φ D2-the diameter of the PCD bit tip; theta 1-a first vertex angle, theta 2-a second vertex angle, and theta 3-a third vertex angle; theta '1-the first apex angle, theta' 2-the second apex angle.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, not all embodiments, and do not limit the scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

The specific embodiment is as follows:

example 1, as shown in fig. 1-5, a PCD micro drill includes a tool shank 3 and a tool shank 1. The right end of the knife handle 3 is connected with the knife handle 1. The left end of the cutter bar 3 is provided with a PCD cutter head 4. In particular, the PCD tip 4 is designed in one piece with the shank 3.

In this embodiment, the PCD tip 4 is made of a sintered PCD material. The cutter bar 3 is made of hard alloy materials, and has high toughness and enough strength. The knife handle 1 is made of high-strength steel. Therefore, the micro drill is designed in a three-section mode, and not only can the abrasion resistance be guaranteed, but also the overall strength can be guaranteed.

A spiral chip groove 31 is provided on the tool shank 3. Specifically, the flutes 31 extend from the left end of the PCD tip 4 to the right end of the shank 3.

The PCD tip 4 has a land 41 on its outer diameter along the course of the chip groove 31, and the other portion of the holder 3 has no land. Like this, only set up a segment margin at the tip on cutter arbor 3, guarantee that 3 external diameters of cutter arbor and pore wall form effectual support and to the extrusion of pore wall when the processing hole, also avoided the too much contact of 3 right parts external diameters of cutter arbor and pore wall simultaneously to the reduction is to pore wall roughness's influence.

A conical core thickness 5 is provided in the shank 3. Specifically, core thickness 5 extends to the right-hand member of cutter arbor 3 from the left end of PCD tool bit 4, and core thickness 5 from left hand right side crescent, the holistic intensity of promotion cutter arbor 3 that can be obvious.

In the PCD micro drill of this example, a hole of a workpiece is machined by the blade of the PCD tip 4 when in use. The blade zone 41 at the PCD cutter head 4 can ensure that the outer diameter and the hole wall of the cutter rod 3 form effective support and extrusion on the hole wall; meanwhile, the cutter bar 3 on the right side of the cutting edge 41 is not provided with the cutting edge, so that the contact friction between the part without the cutting edge on the cutter bar 3 and the hole wall during hole machining is avoided, and the quality of the machined hole is improved. A conical core thickness 5 is further arranged in the cutter bar 3, so that the strength of the cutter bar 3 is obviously improved, and the service life of the micro drill is prolonged.

Further, the length of the straight line from the leftmost end to the rightmost end of the land 41 is referred to as a land length L2, and the diameter of the left end of the PCD tip 4 is referred to as a diameter Φ D2 of the PCD tip end portion. Specifically, 1.5 φ D2L 2 5 φ D2.

Further, the entire shank 3 is in a conical pattern. Specifically, the cutter arbor 3 diminishes from left to right gradually, avoids cutter arbor 3 external diameter and pore wall area of contact too big when processing the hole like this, causes the too big condition that leads to of cutting resistance cutter arbor 3 breaks.

Furthermore, the right end of the cutter bar 3 is provided with the connecting part 2, the left end of the cutter handle 1 is provided with the connecting hole, the connecting part 2 is embedded into the connecting hole and is connected with the cutter bar 3 and the cutter handle 1 through welding, so that the welding area is larger, and high welding strength is effectively ensured; and because the cutter bar 3 and the PCD cutter head 4 of the hard alloy are arranged integrally, the integral rigidity and the strength of the micro drill are improved.

Further, the length of the joint 2 in the left-right direction is referred to as the axial length L1 of the joint, and the diameter of the right end of the joint 2 is referred to as the diameter Φ D1 of the joint. Specifically, 2 × φ D1 ≦ L1 ≦ 5 × φ D1.

Further, the tip of the left end of the PCD cutter head 4 is provided with 1-3 apex angles. Specifically, the top angles are reduced from left to right in sequence, and the micro drill is guaranteed to have enough sharpness.

In this embodiment, the tip of the left end of the PCD cutter head 4 is provided with 3 vertex angles, an included angle between the first flank surfaces 42 at two first vertex angles and between the second flank surfaces 43 at two first vertex angles is the first vertex angle θ 1, an included angle between the flank surfaces 44 at two second vertex angles is the second vertex angle θ 2, and an included angle between the flank surfaces 45 at two third vertex angles is the third vertex angle θ 3, so that the first vertex angle θ 1 has two relief angles, and the second vertex angle θ 2 and the third vertex angle θ 3 have one relief angle. Specifically, the angle ranges are 90 ° < θ 1<180 °, 60 ° < θ 2 ≦ 90 °, 20 ° < θ 3 ≦ 60 °.

Specifically, the first flank surfaces 42 at two first vertex angles, the second flank surfaces 43 at two first vertex angles, the flank surfaces 44 at two second vertex angles, and the flank surfaces 45 at two third vertex angles are all strictly symmetrically arranged, so that the formed cutting edges are strictly symmetrical, efficient cutting is facilitated, and drilling deviation is avoided.

Embodiment 2, as shown in fig. 6, a PCD micro drill is different from the foregoing embodiments in that a PCD tip of the micro drill is provided with two vertex angles, which are a first vertex angle 'θ' 1 and a second vertex angle 'θ' 2, respectively, and other structures are not described herein again. Specifically, 90 ° < θ '1 <180 °, 60 ° < θ' 1 ≦ 90 °.

The utility model is described above with reference to the accompanying drawings, it is obvious that the specific implementation of the utility model is not limited by the above-mentioned manner, and it is within the scope of the utility model to adopt various insubstantial modifications of the technical solution of the utility model or to apply the concept and technical solution of the utility model directly to other occasions without modification.

Claims

1. A PCD micro drill comprises a cutter bar and a cutter handle connected with the cutter bar, wherein a PCD cutter head is arranged at the end part of the cutter bar far away from the cutter handle, and the PCD micro drill is characterized in that a spiral chip groove is arranged on the cutter bar; a cutting edge is arranged on the outer diameter of the cutter bar along the chip groove only at the PCD cutter head; a conical core thickness is arranged in the cutter bar, and one end, close to the PCD cutter head, of the core thickness is smaller than one end, close to the cutter handle, of the core thickness.

2. A PCD micro drill according to claim 1, characterised in that the linear length of the land in the axial direction of the shank is between 1.5 and 5 times the diameter of the end of the PCD tip.

3. A PCD micro drill according to claim 2, characterised in that the shank is generally conical in form, the end of the shank adjacent the shank being smaller than the end of the shank adjacent the PCD tip.

4. A PCD micro drill according to claim 3, characterised in that the shank is provided with a joint near the end of the shank, the joint being embedded in the shank and joined by welding.

5. A PCD micro-drill according to claim 4, wherein the axial length of the joint lies in the range 2 to 5 times the diameter of the joint.

6. A PCD micro-drill according to any one of claims 1 to 5, wherein the tip of the PCD bit is provided with 1 to 3 apex angles.

7. A PCD micro-drill according to claim 6, wherein the apex angles decrease in sequence in a direction from the PCD bit to the shank.

8. A PCD micro-drill according to claim 7, wherein only the first apex angle adopts double clearance angles in the direction from the PCD bit to the shank.