TWM584722U - Tool with hard coating - Google Patents

Abstract

The present invention is applicable to the technical field of drilling tools, and discloses a cutting tool with a hard coating, including a cutting tool body. The cutting tool body is provided with a chip discharge groove and a spiral surface on the outer periphery; the circumferential length of the spiral surface is the cutting tool body 0% to 80% of the circumferential length, a hard coating is deposited on the spiral surface, and the thicknesses of the hard coating at the tool body tips L3 and L4 along the axial direction of the tool body are H1, H2, respectively, L4 is greater than L3, and the ratio of H2 / H1 is 1 or more and 1.5 or less; the outer diameter of the tool body at the hard coating layer is D1, and the outer diameter of the tool body outside the spiral surface is D2, and D2 is less than D1. The cutting tool provided by the new model has a hard coating and has good machining effect and long service life.

Description

Tool with hard coating

The invention relates to the technical field of drilling tools, in particular to a tool with a hard coating.

With the development of the printed circuit board industry, the use of tools has increased significantly, and new coating materials are needed to increase the tool life to reduce processing costs. At the same time, a large number of new materials have emerged in the printed circuit industry, such as high-frequency high-speed boards and ceramic filling. Boards, flexible boards, and packaging boards, the processing difficulty has increased significantly. The increase of life and the emergence of new materials have higher requirements on tool wear and dust discharge, and the conventional uncoated tools can be improved to a certain extent by the tool structure parameters and the substrate material, but the increase is limited and it is no longer possible Solve this series of problems well.

In order to improve the life of tools and the quality of printed circuit boards, many companies at home and abroad carry out surface modification treatments on tools, such as chemical vapor deposition (CVD) and physical vapor deposition (PVD). At the same time, the technology has been widely used. It is used in metal processing such as steel, but coated tools are less used in printed circuit boards, and there is a great demand. Although China has absorbed foreign coating equipment and technology through years of consumption, and has made some progress in coating technology, coating equipment and coating processes, there are relatively Many questions. For example: (1) the thickness, hardness and surface quality of the coating itself need to be improved; (2) the bonding force between the coating and the substrate still needs to be improved; (3) the combination of coating technology and the design of the tool needs to be closer.

The present invention aims to solve at least one of the above technical problems, and provides a tool with a hard coating, which has a good machining effect and a long service life.

The new technical solution is: a cutting tool with a hard coating, comprising a cutting tool body, the front end of the cutting tool body is a tip, and the cutting tool body is provided with at least one row spirally extending from the cutting tool tip toward the cutting tool tip on the outer periphery. Chip flute, the tool body is further provided with at least one spiral surface spirally extending from the tip of the tool body toward the tool end on the outer periphery, and the length of the chip ejection groove in the axial direction of the tool body is L1, and the spiral surface The length along the axial direction of the tool body is L2, and L2 is less than L1;

The total length of the length of the spiral surface in the direction of the outer circumference of the tool body is 0% to 80% of the length of the circumference of the tool body. A hard coating is deposited on the spiral surface and is located at a distance L3 from the tip of the tool body in the axial direction of the tool body. The thickness of the hard coating layer is H1, and the thickness of the hard coating layer at the point L4 along the axial direction of the tool body from the tool body is H2, L4 is greater than L3, and the ratio of H2 / H1 is 1 or more And below 1.5;

The outer diameter of the cutter body at the hard coating layer is D1, and the outer diameter of the cutter body outside the spiral surface is D2, and D2 is smaller than D1.

Preferably, the hard coating layer includes a metal component and a non-metal component, and the metal component contains at least Cr, and the non-metal component contains at least Si and N.

Preferably, the atomic percentage of the Si element in the non-metallic component is 0.1 to 10%.

Preferably, in the axial direction of the spiral surface, the thickness of the hard coating layer is in a range of 0.4 to 20 microns.

Preferably, the surface friction coefficient of the hard coating layer is 0.10 to 0.40.

Preferably, the difference between D2 and D1 is between 0.001 and 0.200 mm.

Preferably, the difference between D2 and D1 is between 0.001 and 0.080 mm.

Preferably, the tool body is made of a hard alloy containing WC and Co.

Preferably, the front end of the spiral surface is located at a distance from the tool body tip L3 along the axial direction of the tool body, and the end of the spiral surface is located at a distance from the tool body tip L4 along the tool body axial direction.

Preferably, the thickness of the hard coating at the tip L3 of the tool body along the axial direction of the tool body is 4 micrometers.

Preferably, the length of the spiral surface in the axial direction of the cutter body is less than 2 mm.

Preferably, the length of the spiral surface in the axial direction of the cutter body is 0.7 mm; and / or,

The total length of the length of the spiral surface in the direction of the outer circumference of the cutter body is 10% of the length of the circumference of the cutter body; and / or,

D1-D2 is 0.018mm; and / or,

The minimum thickness of the hard coating is 4 micrometers, and H2 / H1 is 1.1.

The cutting tool provided by the present invention and a manufacturing method thereof have good processing effect and long service life.

In order to make the purpose, technical solution and advantages of the present invention more clear, the present invention will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

It should be noted that the terms “setting” and “connection” should be understood in a broad sense. For example, the terms “setting” and “connecting” may be directly set and connected, and may also be set and connected indirectly through centering element components and centering structures.

In addition, if there are "vertical", "horizontal", "length", "width", "thickness", "up", "down", "front", "rear", "left", " "Right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. indicate the orientation or position relationship based on the orientation or position relationship or general The state of being placed or used is only to facilitate the description of the novel and simplified description, and is not to indicate or imply that the structure, feature, device, or element referred to must have a specific orientation or positional relationship, nor must it be constructed in a specific orientation And operation, therefore cannot be understood as a limitation on the novel model. In the description of the present invention, unless otherwise stated, "multiple" means two or more.

The various specific technical features and embodiments described in the specific embodiments can be combined in any suitable manner if there is no contradiction, for example, different specific technical features / embodiments can be combined to form different In order to avoid unnecessary repetition, various possible combinations of specific technical features / embodiments in the present invention are not described separately.

As shown in FIG. 1 to FIG. 3, a tool with a hard coating provided by the embodiment of the present invention can be used for the processing of a printed circuit board (PCB), and includes a tool body 10 whose front end is a tip. (Tool tip), the tool body 10 is provided with at least one chip discharge groove 11 spirally extending from the tip of the tool body 10 toward the tool end on the outer periphery, and the tool body 10 is further provided with at least one self-tool body 10 on the outer periphery. The spiral surface 12 whose tip is spirally extended toward the end of the tool, the length of the chip removal groove 11 along the axial direction of the tool body 10 from the tool tip is L1, and the spiral surface 12 runs along the tool from the tool tip The length of the body 10 in the axial direction is L2, and L2 is less than L1. The total length of the length of each spiral surface 12 along the outer circumferential direction of the tool body 10 is 0% or more and 80% or less of the circumferential length of the tool body 10.

The outer diameter of the spiral surface 12 in the tool body 10 is larger than the outer diameter of the tool body 10 outside the spiral surface 12. The spiral surface 12 and the chip discharge groove 11 are circumferentially offset from each other. The total length of the length of the surface 12 along the outer circumferential direction of the tool body 10 is 0% or more and 80% or less of the circumference of the tool body 10. A hard coating layer 2 is deposited on the spiral surface 12, and the tool body 10 is axially distanced from the tool body. The thickness of the hard coating layer 2 at the tip L3 is H1 (at the edge of the front end of the side of the tool body 10), and the thickness of the hard coating layer 2 at the tip L4 of the tool body 10 along the axial direction of the tool body 10 is H2. L4 is greater than L3, and the ratio of H2 / H1 is 1 or more and 1.5 or less, that is, relatively far from the tip of the tool body 10, the thickness of the hard coating layer 2 is thick, and the thickest and thinnest parts of the hard coating layer 2 The thickness ratio is less than 1.5.

In this embodiment, the thickness of the hard coating layer 2 at the front end of the spiral surface 12 (start of the spiral surface 12) is H1, and the thickness of the hard coating 2 at the rear end of the spiral surface 12 (the end of the spiral surface 12) The thickness of H2 is H2, and the ratio of H2 / H1 is 1.0 or more and 1.5 or less. Preferably, the ratio of H2 / H1 is between 1.001 and 1.25.

The outer diameter of the tool body 10 at the hard coating layer 2 is D1, that is, the outer diameter of the hard coating layer 2 is D1, and the outer diameter of the tool body 10 outside the spiral surface 12 is D2, D2 < D1. At the section of the hard coating layer 2, that is, from the beginning of the spiral surface 12 to the end of the spiral surface 12, the corresponding outer diameter of the surface of the hard coating layer 2 is D1, and the thickness of the hard coating layer 2 is from the spiral The thickness of the section from the beginning of the surface 12 to the end of the spiral surface 12 gradually becomes thicker, then the diameter of the tool body 10 in the section from the beginning of the spiral surface 12 to the end of the spiral surface 12 gradually decreases. The diameter at the end of the spiral surface 12 and the diameter of the tool body 10 (the section corresponding to L5 in the figure) connected to the spiral surface 12 may be D2. In the L1 segment, if the L4 segment is removed, it is the L5 segment, that is, L1 = L4 + L5; in the L4 segment, the L3 segment is removed, and the L2 segment is L4 = L3 + L2. The tool body 10 may be connected with a tapered connecting shank, and the rear end of the connecting shank may be welded with a shank having a diameter larger than D2, and the shank may be made of stainless steel. In this embodiment, one or more chip removing grooves 11 are formed on the outer periphery of the tool body 101 from the tool tip toward the end, and the length of the chip removing grooves 11 is L1. The chip removing grooves 11 can be formed by grooving of a grinding wheel, which can be optimized. Grinding wheel size and grooving parameters to adjust the surface finish of the chip evacuation slot 11 and reduce the surface friction coefficient of the chip evacuation slot 11 to improve the chip evacuation performance of the tool. And because D2 <D1, the front end of the tool participates in cutting, and the hole diameter processed on the printed circuit board is D1, which is larger than the outer diameter D2 of the tool body 10 outside the spiral surface 12 (L5 segment), which avoids the wear of the rear end of the tool and the hole wall. . During tool processing, only the spiral surface 12 is in contact with the hole wall of the printed circuit board; by adjusting the axial length and the circumferential length of the spiral surface 12, the contact area between the spiral surface 12 and the hole wall of the printed circuit board to be processed can be reduced, reducing Surface friction improves the quality of the hole wall.

Specifically, the hard coating layer 2 includes a metal component and a non-metal component, and the metal component contains at least Cr, which has high hardness and good wear resistance, and the non-metal component contains at least Si and N. The atomic percentage occupied by the Si element is 0.05% to 15%. In this embodiment, the atomic percentage occupied by the Si element in the non-metallic component is 0.1 to 10%, and may specifically be 0.2% to 8%. The atomic percentage of Si in the metal component is 0.5 to 6%.

Specifically, the thickness of the hard coating layer 2 in the axial direction of the spiral surface 12 is in the range of 0.4 to 10 microns, that is, the thinnest thickness of the hard coating layer 2 may be 0.4 microns, or the hard coating layer 2 The thickness can be 10 micrometers at the thickest, and needs to satisfy that the thickness of the hard coating layer 2 becomes gradually thicker and the thickness ratio is less than 1.5 within the range of L3 to L4 from the tip of the tool body 10. In this embodiment, the distance from the tip L3 of the tool body 10 along the axial direction of the tool body 10 is the front end of the spiral surface 12, and the distance from the tip L3 of the tool body 10 along the axial direction of the tool body 10 is the side of the tool body 10. The front edge is the end of the spiral surface 12 at a distance L4 from the tip end of the tool body 10 along the axial direction of the tool body 10. The hard coating 2 needs to have a certain thickness in order to exert the function of lubrication and abrasion resistance. However, in the process of processing a hard circuit board, the tool always contacts the hole wall, causing the hard coating 2 of the spiral surface 12 to wear out as a whole. And in the service life, the tool needs to be repeatedly ground and reused. It has a large number of holes and a long service life. In order to ensure a sufficient coating thickness after grinding, the tool is designed as a hard coating on the front end of the tool 2 The thickness H1 is smaller than the hard coating 2 thickness H2 at the back of the tool (relative), so that the new tool and the coated coating can maintain a sufficient thickness, so that the processing performance of the new tool and the coated coating tool is maintained. Consistent, the consistency of the processed product's pore diameter is good.

Specifically, the surface friction coefficient of the hard coating layer 2 is 0.25 to 0.35. Preferably, the surface friction coefficient of the hard coating layer 2 is 0.28 to 0.32. In this embodiment, the surface friction coefficient of the hard coating layer 2 is 0.30. .

Preferably, the difference between D2 and D1 is between 0.001 and 0.200 mm.

Preferably, the difference between D2 and D1 is between 0.001 and 0.1 mm.

Specifically, the difference between D2 and D1 is between 0.001 and 0.080 mm, and preferably, the difference between D2 and D1 is between 0.01 and 0.060 mm.

Specifically, the cutter body 10 is made of a hard alloy containing WC and Co.

In this embodiment, the thickness of the hard coating layer 2 is 4 micrometers along the axial direction of the tool body 10 from the tip L3 of the tool body 10 (the front edge of the side of the tool body 10).

Specifically, the length of the spiral surface 12 in the axial direction of the tool body 10 (that is, the length of L2) may be less than 4 mm. Preferably, the length of the spiral surface 12 in the axial direction of the tool body 10 may be less than 4 mm. Less than 3 mm. In this embodiment, the length of the spiral surface 12 in the axial direction of the tool body 10 is less than 2 mm.

In this embodiment, the length of the spiral surface 12 in the axial direction of the tool body 10 is 0.7 mm.

In this embodiment, the total length of the length of the spiral surface 12 along the outer circumferential direction of the cutter body 10 is 10% of the circumference of the cutter body 10.

In this embodiment, D1-D2 is 0.018 mm.

In this embodiment, the minimum thickness of the hard coating layer 2 is 4 micrometers, and H2 / H1 is 1.1.

This embodiment also provides a method for manufacturing a tool, which is used to manufacture the above-mentioned tool with a hard coating, including the following steps:

Preparation of cemented carbide containing WC and Co;

Processing the hard alloy into a tool body 10;

A chip discharge groove 11 having a length L1 in the axial direction from the tip of the tool body 10 is formed in the tool body 10 by means of a groove of a grinding wheel;

A spiral surface 12 having a length L2 along the axial direction of the tool body 10 is formed on the outer periphery of the tool body 10, and L2 is less than L1;

A hard coating layer 2 is deposited on the spiral surface 12 at a distance between the thickness of the hard coating layer 2 at the tip L3 of the tool body 10 and a thickness of the hard coating layer 2 at the tip L4 of the tool body 10 The ratio is between 1 and 1.5.

The new type deposits a coating material (composite coating material) on the spiral surface 12 to form a hard coating layer 2, which significantly reduces the frictional force in the peripheral direction of the tool without affecting the surface finish of the tool and ensuring chip removal performance of the tool. And because D2 is smaller than D1, the front end of the tool participates in cutting, and the hole diameter processed on the printed circuit board is D1, which is larger than the outer diameter D2 of the tool body 10 outside the spiral surface 12 (L5 segment), which avoids the wear of the rear end of the tool and the hole wall. . During tool processing, only the spiral surface 12 is in contact with the hole wall of the printed circuit board. By adjusting the axial length and the circumferential length of the spiral surface 12, the contact area between the spiral surface 12 and the hole wall of the printed circuit board to be processed can be optimized. Reduce surface friction and improve hole wall quality. With the composite coating tool prepared by the new method, when processing printed circuit boards such as ordinary FR-4, halogen-free, and HTG plates, the outer diameter can be reduced, the needle breakage rate can be reduced, and the service life of micro-drills can be at least increased to 2 to 4 times, at the same time can guarantee the quality of drilling, greatly improve processing efficiency and reduce production costs.

In the comparison experiment, a common tool with a drill diameter of 0.20 mm is selected for comparison with a tool with a hard coating layer 2 (hereinafter referred to as the tool) provided by the new embodiment. The above-mentioned hard coating layer 2 is deposited on the spiral surface 12 of the tool, and the length of the spiral surface 12 in the axial direction is preferably 0.7 mm. Preferably, the total length of the length of the spiral surface 12 in the tool peripheral direction is the tool circumferential length (πd ), And D1 of the outer diameter at the spiral surface 12 is larger than the outer diameter D2 of the segment after the spiral surface 12 and D2 <D1; and D1-D2 is 0.018 mm, preferably the thickness of the hard coating 2 is 4 Microns, and H2 / H1 is 1.1. The test conditions are as follows:

1. Test conditions:

Sheet: Shengyi halogen-free sheet S1155, 1.0 * 2PNL, 10 layers; 0.5 oz copper thickness;

Cover pad: 1.5mm phenolic pad and 0.15mm aluminum sheet;

Tool drilling diameter: 0.20mm ordinary tool and this tool

Drilling machine: Hitachi 160Krpm drilling rig

Parameter speed: S158Krpm, feed F36mm / s, return R300mm / s, hole number 620,000;

The test results are as follows: After the ordinary tool and the tool have processed 260,000 holes according to the above-mentioned processing conditions, the spiral surface of the ordinary tool is severely worn, as shown in Figure 5; the spiral surface 12 of the tool is slightly worn, as shown in Figure 4.

After the common tool and the same tool are processed with the same hole limit, the outer diameter D1 of the spiral surface 12 is compared in Table 1. It can be found that the outer diameter of the common tool has become significantly smaller, while the outer diameter of the tool has less change and good stability.

Table 1 Cutter New needle 6000 holes Grind 6000 holes once Grind 6000 holes twice Grind 3 times 6000 holes Lapping 6000 holes 4 times Grind 6000 holes 5 times Outer diameter of common tool 0.2000 0.1930 0.1886 0.1830 0.1801 0.1756 The outer diameter of the tool 0.2060 0.2058 0.2052 0.2049 0.2046 0.2043

The quality comparison of the hole wall processed by ordinary tools and this tool is shown in Table 2:

Table 2 standard Cutter New needle 6000 holes Grind 6000 holes once Grind 6000 holes twice Grind 3 times 6000 holes Lapping 6000 holes 4 times Grind 6000 holes 5 times CPK ＞ 1.33 Ordinary tool NG NG NG NG NG NG The cutter OK OK OK OK OK OK Hole thickness <25 microns Ordinary tool NG NG NG NG NG NG The cutter OK OK OK OK OK OK Nail head <1.5 Ordinary tool NG NG NG NG NG NG The cutter OK OK OK OK OK OK

It can be seen that even after grinding multiple times, the tool can maintain better hole wall quality after processing more porous numbers, and its service life is much longer than ordinary tools, which is conducive to improving production efficiency and reducing production costs.

The above description is only the preferred embodiments of the present invention, and is not intended to limit the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principles of the present invention shall be included in the protection of the present invention. Within range.

2‧‧‧hard coating

10‧‧‧Tool body

11‧‧‧Chip

12‧‧‧ Spiral

D1, D2‧‧‧

H1, H2‧‧‧thickness

L1, L2, L3, L4‧‧‧ length

In order to more clearly illustrate the technical solution in the embodiment of the present invention, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the invention. Those with ordinary knowledge in the technical field can obtain other schemes according to these schemes without paying progressive labor.

FIG. 1 is a schematic plan view of a tool with a hard coating provided by an embodiment of the present invention;

FIG. 2 is a schematic plan view of a tool with a hard coating provided by an embodiment of the present invention;

FIG. 3 is a partially enlarged schematic plan view of a cutter with a hard coating provided by the embodiment of the present invention; FIG.

FIG. 4 is a schematic diagram of wear in a comparative experiment of a tool with a hard coating provided by the embodiment of the present invention; and

Figure 5 is a schematic diagram of the wear of a common tool in a comparative experiment.

Claims (10)

A cutting tool with a hard coating includes a cutting tool body, the front end of the cutting tool body is a tip, and the cutting tool body is provided with at least one chip discharge groove spirally extending from the cutting tool tip toward the cutting tool end on the cutting tool body. There is also provided at least one helical surface spirally extending from the tip of the tool body toward the end of the tool. The length of the chip removal groove in the axial direction of the tool body is L1, and the length of the spiral surface in the axial direction of the tool body is L2. , And L2 is less than L1; the outer diameter of the spiral surface of the tool body is greater than the outer diameter of the tool body outside the spiral surface, and the total length of the length of the spiral surface along the outer circumference of the tool body is more than 0% of the tool body circumference and Below 80%, a hard coating is deposited on the spiral surface, and the thickness of the hard coating is H1 away from the tool body tip L3 along the axial direction of the tool body, and the spiral surface is away from the tool body tip L4 along the tool body axis. The thickness of the hard coating layer is H2, L4 is greater than L3, and the ratio of H2 / H1 is 1 or more and 1.5 or less; the outer diameter of the tool body at the hard coating layer is D1, the Having an outer diameter of the coil body to the outside surface is D2, and D2 is less than D1. The tool with a hard coating according to item 1 of the scope of patent application, wherein the hard coating includes a metal component and a non-metal component, and the metal component contains at least Cr, and the non-metal component contains at least Si and N. The tool with a hard coating according to item 2 of the scope of the patent application, wherein the atomic percentage of the Si element in the non-metallic component is 0.1 to 20%. The tool with a hard coating according to item 1 of the scope of patent application, wherein the thickness of the hard coating in the axial direction of the spiral surface is in the range of 0.4 to 20 microns. The tool with a hard coating according to item 1 of the scope of the patent application, wherein the surface friction coefficient of the hard coating is 0.10 to 0.40. The tool with a hard coating according to item 1 of the scope of patent application, wherein the difference between D2 and D1 is between 0.001 and 0.200 mm. The tool with a hard coating according to item 1 of the scope of patent application, wherein the tool body is made of a hard alloy containing WC and Co. The tool with a hard coating according to item 1 of the patent application scope, wherein the distance from the tool body tip L3 along the tool body axial direction is the front end of the spiral surface, and the tool body axial distance from the tool body tip L4 Is the end of the spiral surface. The tool with a hard coating according to item 8 of the scope of patent application, wherein the thickness of the hard coating at the tip L3 of the tool body along the tool body axis is 4 microns; the spiral surface is along the tool body axis The length in the direction is less than 2mm. The tool with a hard coating according to item 6 of the scope of patent application, wherein the length of the spiral surface in the axial direction of the tool body is 0.7 mm; and / or, the total length of the length of the spiral surface in the peripheral direction of the tool body is 10% of the circumferential length of the tool body; and / or, D1-D2 is 0.018 mm; and / or, the minimum thickness of the hard coating is 4 micrometers, and H2 / H1 is 1.1.