CN216176926U - Micro drill with high heat conduction and low expansion rate - Google Patents
Micro drill with high heat conduction and low expansion rate Download PDFInfo
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- CN216176926U CN216176926U CN202122296271.4U CN202122296271U CN216176926U CN 216176926 U CN216176926 U CN 216176926U CN 202122296271 U CN202122296271 U CN 202122296271U CN 216176926 U CN216176926 U CN 216176926U
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Abstract
The utility model discloses a micro drill with high heat conduction and low expansion rate, which comprises a drill handle, wherein the rear end of the drill handle is provided with a chamfer, the front end of the drill handle is provided with a drill diameter, a handle inclined plane angle is arranged between the drill diameter and the drill handle, the drill diameter is provided with a first spiral groove and a second spiral groove, two sides of a connecting surface formed by the first spiral groove and the second spiral groove are ground to form a cutting edge, the front end of the drill diameter forms two main cutting tool surfaces positioned on a plane and two auxiliary cutting tool surfaces connected with the main cutting tool surfaces, the main cutting tool surfaces and the auxiliary cutting tool surfaces form a point-shaped central drill point, and the cutting edge forms a central cutting cross edge on a common second plane. The utility model provides a micro drill with high heat conductivity and low expansion rate, which uses a low thermal expansion coefficient material non-expansion steel consisting of 64 percent of Fe and 36 percent of Ni, has great plasticity, is not easy to break off chips, is easier to drill and cut on the structural design of a cutting tool surface, is not easy to wear the tool surface, and prolongs the service life of the micro drill.
Description
Technical Field
The utility model relates to a drill bit, in particular to a micro drill with high heat conduction and low expansion rate.
Background
In recent years, as printed circuit boards are developed from single-layer boards to double-sided boards and multi-layer boards and are continuously developed towards high precision, high density and high reliability, the requirement of circuit board industry on micro-drilling is higher and higher. The micro drill rotates at a high speed during drilling, the energy of the micro drill is converted into heat, particularly for a multilayer board, if the heat cannot be conducted and dissipated timely, the temperature of the micro drill is increased, thermal stress is inevitably generated at a welding joint, and creep deformation, fatigue and fracture occur at the joint. Therefore, the heat dissipation problem is a problem which is urgently needed to be solved by various micro-drill products, the utility model provides a high-heat-conductivity low-expansion micro-drill, the micro-drill efficiency is ensured, the running efficiency of the micro-drill is improved, a low-thermal expansion coefficient material is used, and a hard alloy coating is coated on the surface of the drill diameter, so that the micro-drill is not easy to break during cutting, and the service life of the micro-drill is prolonged.
SUMMERY OF THE UTILITY MODEL
In order to solve the problems in the prior art, the utility model provides a micro drill with high heat conductivity and low expansion rate, which uses non-expansion steel which is a low thermal expansion coefficient material and consists of 64 percent of Fe and 36 percent of Ni as the drill diameter, has great plasticity, is not easy to break off chips, is easier to drill and cut on the structural design of a cutting tool face, is not easy to wear the tool face and prolongs the service life of the micro drill.
The technical scheme adopted by the utility model for solving the technical problems is as follows: the utility model provides a little brill of high heat conduction low expansion rate, includes a drill handle, and the drill handle rear end is provided with a chamfer, and the drill handle front end is provided with bores the footpath, is provided with stalk portion inclined plane angle in the middle of boring footpath and the drill handle, bore the footpath and be provided with first helicla flute and second helicla flute, the both sides on the face of being connected that first helicla flute and second helicla flute become form the land through grinding, bore footpath front end formation two main cutting knife face that are located on a plane and two vice cutting knife faces that link to each other with main cutting knife face, main cutting knife face and vice cutting knife face form a punctiform center drill point, and the cutting edge land forms central cutting chisel edge on common second plane.
The high-heat-conductivity low-expansion-rate micro drill is characterized in that the first spiral groove and the second spiral groove are located at positions opposite to each other on the diameter surface.
According to the micro drill with high heat conductivity and low expansion rate, the second spiral groove extends from the front end of the drill diameter to the root of the drill diameter, the first spiral groove is a short groove, and the length of the first spiral groove is one third of that of the second spiral groove.
According to the micro drill with high heat conductivity and low expansion rate, the spiral angle is formed between the first spiral groove and the second spiral groove, and the angle of the spiral angle is 35 degrees +/-1 degree.
According to the micro drill with high heat conductivity and low expansion rate, the side surfaces of the first spiral groove and the second spiral groove form a breadth width surface.
According to the micro drill with high heat conductivity and low expansion rate, the grinding surfaces formed on the drill diameter cylindrical surface along the two sides of the first spiral groove and the second spiral groove are drill backs, and two common blade zone planes are formed.
According to the micro drill with high heat conductivity and low expansion rate, the drill point angle is 130 degrees +/-5 degrees.
According to the micro drill with high heat conductivity and low expansion rate, the non-expandable steel is used as the drill diameter of the micro drill, and the hard alloy coating is coated on the surface of the drill diameter after slotting by using a high-temperature chemical vapor deposition method; before coating, the surface of the drill diameter is purified, and the cutting edge part is passivated; after coating, because the linear expansion coefficient of TiC is closest to that of the base material, a TiC thin layer is coated on the surface of the drill diameter to avoid the reduction of the bending strength of the blade caused by the generation of residual tensile stress, and a layer of hard alloy coating TiN is coated outside the blade.
The high-thermal-conductivity low-expansion-rate micro drill is also named invar steel, and the non-expansion steel is prepared from a low-thermal-expansion-coefficient material consisting of 64% of Fe and 36% of Ni.
Compared with the prior art, the utility model has the following beneficial technical effects:
1. the utility model provides a high-heat-conductivity low-expansion-rate micro drill, which uses a low-thermal-expansion-coefficient material non-expansion steel consisting of 64% of Fe and 36% of Ni, has great plasticity, and is not easy to break chips;
2. the design of the spiral groove in the drill diameter ensures that the cutting tool face is easier to drill and cut in structural design, the tool face is not easy to wear, and the service life of the micro drill is prolonged;
3. the drill bit with high heat conduction and low expansion rate is not easy to creep, fatigue and fracture, and the drill body has good use effect and long service life.
Drawings
The utility model is further illustrated with reference to the following figures and examples.
FIG. 1 is a schematic diagram of the present invention without a helical groove;
FIG. 2 is a detail view of the spiral groove structure of the present invention;
FIG. 3 is an enlarged partial view of a center cutting chisel edge in accordance with the present invention;
FIG. 4 is an enlarged view of a portion of the bur back of the present invention;
fig. 5 is a partially enlarged view of the major cutting surface and the minor cutting surface in the present invention.
In the figure, 1, a drill shank, 2, a bevel angle of the drill shank, 3, a drill diameter, 4, a chamfer, 5, a blade zone, 6, a first spiral groove, 7, a second spiral groove, 8, a blade zone plane, 9, a central cutting chisel edge, 10, a drill back, 11-11 ', a main cutting tool face, 12-12', an auxiliary cutting tool face and 13, a central drill tip.
Detailed Description
In order to make the technical solutions of the present invention better understood, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
The utility model provides a little brill of high heat conduction low expansion rate, includes a drill shank 1, and 1 rear end of drill shank is provided with a chamfer 4, 1 front end of drill shank is provided with bores footpath 3, bores footpath 3 and is provided with handle inclined plane angle 2 in the middle of the drill shank 1, bores footpath 3 and is provided with first helicla flute 6 and second helicla flute 7, and both sides on the connection face that first helicla flute 6 and second helicla flute 7 formed form margin 5 through grinding, 3 front end of bores footpath forms two main cutting knife face 11, 11 ' that are located on a plane and two vice cutting knife face 12, 12 ' that link to each other with main cutting knife face 11, 11 ', main cutting knife face 11, 11 ' and vice cutting knife face 12, 12 ' form a punctiform central drill point 13, and the margin 5 of cutting edge forms central cutting chisel edge 9 on common second plane.
Further, the first helical groove 6 and the second helical groove 7 are located opposite to each other on the drill diameter surface.
Further, the second spiral groove 7 extends from the front end of the drill diameter to the root of the drill diameter, the first spiral groove 6 is a short groove, and the length of the first spiral groove 6 is one third of that of the second spiral groove 7.
Further, a helical angle is formed between the first spiral groove 6 and the second spiral groove 7, and the angle of the helical angle is 35 ° ± 1 °.
Further, the side surfaces of the first spiral groove 6 and the second spiral groove 7 form a breadth width surface.
Furthermore, the grinding surfaces formed on the cylindrical surface of the drill diameter 3 along the two sides of the first spiral groove 6 and the second spiral groove 7 are drill backs 10, and two common blade plane surfaces 8 are formed.
Further, the point angle is 130 ° ± 5 °.
Further, using invar as the drill diameter 3 of the micro drill, and coating a hard alloy coating on the surface of the drill diameter 3 after slotting by using a high-temperature chemical vapor deposition method; before coating, the surface of the drill diameter 3 is purified, and the cutting edge part is passivated; after coating, because the linear expansion coefficient of TiC is closest to that of the base material, a TiC thin layer is coated on the surface of the drill diameter 3 to avoid generating residual tensile stress to reduce the bending strength of the blade, and then a layer of hard alloy coating TiN is coated outside.
The above embodiments are only exemplary embodiments of the present invention, and are not intended to limit the present invention, and the scope of the present invention is defined by the claims. Various modifications and equivalents may be made by those skilled in the art within the spirit and scope of the present invention, and such modifications and equivalents should also be considered as falling within the scope of the present invention.
Claims (9)
1. The utility model provides a little brill of high heat conduction low expansion rate, includes drill shank (1), its characterized in that: a chamfer (4) is arranged at the rear end of the drill handle (1), a drill diameter (3) is arranged at the front end of the drill handle (1), a handle inclined plane angle (2) is arranged between the drill diameter (3) and the drill handle (1), the drill diameter (3) is provided with a first spiral groove (6) and a second spiral groove (7), two sides of the connecting surface formed by the first spiral groove (6) and the second spiral groove (7) are ground to form a cutting edge (5), the front end of the drill diameter (3) forms two main cutting tool surfaces (11, 11 ') which are positioned on a plane and two auxiliary cutting tool surfaces (12, 12 ') which are connected with the main cutting tool surfaces (11, 11 '), the main cutting surfaces (11, 11 ') and the auxiliary cutting surfaces (12, 12') form a point-shaped central drill point (13), and the blade lands (5) of the blades form a central cutting chisel edge (9) on a common second plane.
2. A high thermal conductivity low expansion rate micro drill according to claim 1, characterized in that the first helical groove (6) and the second helical groove (7) are located opposite to each other on the drill diameter (3) surface.
3. A high thermal conductivity low expansion rate micro drill according to claim 1, wherein the second spiral groove (7) extends from the front end of the drill diameter (3) to the root of the drill diameter (3), the first spiral groove (6) is a short groove, and the length of the first spiral groove (6) is one third of the length of the second spiral groove (7).
4. A high thermal conductivity low expansion rate micro drill according to any of claims 1 to 3, characterized in that a helical angle is formed between the first helical groove (6) and the second helical groove (7), and the angle of the helical angle is 35 ° ± 1 °.
5. A high thermal conductivity low expansion rate micro drill according to claim 4, wherein the side surfaces of the first spiral groove (6) and the second spiral groove (7) form a breadth width surface.
6. A high thermal conductivity low expansion rate micro drill according to any one of claims 1, 2, 3 and 5, characterized in that the grinding surface formed on the cylindrical surface of the drill diameter (3) along the two sides of the first spiral groove (6) and the second spiral groove (7) is a drill back (10) and forms two common land planes (8).
7. A high thermal conductivity low expansion rate micro-drill according to claim 6, characterized in that the size of the tip angle of the drill tip (13) is 130 ° ± 5 °.
8. The micro drill with high thermal conductivity and low expansion rate as claimed in any one of claims 1, 2, 3, 5 and 7, wherein the micro drill is manufactured by using a non-expandable steel material to prepare the drill diameter (3) of the micro drill, and coating a hard alloy coating on the surface of the drill diameter (3) after slotting by using a high temperature chemical vapor deposition method; before coating, the surface of the drill diameter (3) is purified, and the cutting edge part is passivated; after coating, a TiC thin layer is coated on the surface of the drill diameter (3), and then a hard alloy coating TiN is coated outside.
9. The micro drill with high thermal conductivity and low expansion rate as claimed in claim 8, wherein the non-expandable steel material is prepared from a low thermal expansion coefficient material consisting of 64% by mass of Fe and 36% by mass of Ni.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122296271.4U CN216176926U (en) | 2021-09-18 | 2021-09-18 | Micro drill with high heat conduction and low expansion rate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122296271.4U CN216176926U (en) | 2021-09-18 | 2021-09-18 | Micro drill with high heat conduction and low expansion rate |
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| Publication Number | Publication Date |
|---|---|
| CN216176926U true CN216176926U (en) | 2022-04-05 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202122296271.4U Active CN216176926U (en) | 2021-09-18 | 2021-09-18 | Micro drill with high heat conduction and low expansion rate |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115890925A (en) * | 2022-12-26 | 2023-04-04 | 江门建滔高科技有限公司 | Micro drill bit made of superhard ceramic material and processing method thereof |
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2021
- 2021-09-18 CN CN202122296271.4U patent/CN216176926U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115890925A (en) * | 2022-12-26 | 2023-04-04 | 江门建滔高科技有限公司 | Micro drill bit made of superhard ceramic material and processing method thereof |
| CN115890925B (en) * | 2022-12-26 | 2023-07-04 | 江门建滔高科技有限公司 | Micro drill made of superhard ceramic material and processing method thereof |
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