CN210059916U

CN210059916U - Milling tool for milling holes in holes

Info

Publication number: CN210059916U
Application number: CN201920363189.9U
Authority: CN
Inventors: 刘洋
Original assignee: Shenzhen Jinzhou Precision Technology Corp
Current assignee: Shenzhen Jinzhou Precision Technology Corp
Priority date: 2019-03-21
Filing date: 2019-03-21
Publication date: 2020-02-14
Anticipated expiration: 2029-03-21

Abstract

The utility model is suitable for a milling cutter technical field provides a milling tool for downthehole hole milling bore, including handle of a knife and cutter body, the handle of a knife with connect through inclined plane portion between the cutter body, the cutter body includes the edge the cutter body axial certainly the cutter body front end to the handle of a knife direction sets gradually be used for assistance-localization real-time's auxiliary segment, be used for milling process's processing section and be used for the cantilever section of auxiliary adjustment depth of machining, the auxiliary segment with the diameter of cantilever section all is less than the diameter of processing section. The utility model provides a milling tool for downthehole hole milling bore, steerable milling depth can detach the copper coating that each section did not play the connection effect through-hole section in the through-hole in the PCB board to promote the integrality that the signal carried.

Description

Milling tool for milling holes in holes

Technical Field

The utility model belongs to the technical field of milling cutter structure, especially, relate to a milling tool for downthehole milling bore.

Background

In the present PCB industry, in the design of digital systems, along with the continuous improvement of wiring density and clock frequency, the problems of signal integrity and electromagnetic compatibility and the like are more prominent, and researches show that: the main factors affecting the signal integrity of the signal system include design, board material, transmission line, connector, chip package, etc., and the via hole has a large influence on the signal integrity. In the manufacture of a multilayer board of a PCB, for example, in the manufacture of a 12-layer board, a 1 st layer is connected to a 9 th layer, a through hole (primary drilling) is usually drilled, then copper is deposited to form a via hole, the via hole in the PCB manufacturing process can be regarded as a line, so that the 1 st layer is directly connected to the 12 th layer, actually, the 1 st layer is only connected to the 9 th layer, the 10 th layer to the 12 th layer is connected like a post because no line is arranged, the post influences the path of a signal, the signal integrity problem can be caused in a communication signal, in order to reduce noise interference, the signal integrity is improved, the manufacture difficulty of the PCB is reduced, and through drilling the through hole section which does not play any connection or transmission role from the 10 th layer to the 12 th layer by adopting back drilling, the reflection, scattering and delay of high-speed signal transmission. However, if we only need to connect the layer 1 to the layer 3, the layer 6 to the layer 8, and the layer 10 to the layer 12 in the manufacture of the PCB, then the connection between the layer 3 to the layer 6 and the connection between the layer 8 to the layer 10 need to be disconnected, and it is difficult to remove the via sections that do not function as connection or transmission from the layer 3 to the layer 6 and from the layer 8 to the layer 10 in the same via hole by the existing back drilling technology.

SUMMERY OF THE UTILITY MODEL

The utility model discloses aim at solving one of above-mentioned technical problem at least, provide a milling tool for downthehole hole milling bore, steerable milling depth can detach and not play the through-hole section of connecting action in each section in the through-hole behind the copperized in the PCB board to promote signal transmission's integrality.

The technical scheme of the utility model is that: the utility model provides a milling tool for downthehole hole milling bore, includes handle of a knife and cutter body, the handle of a knife with connect through inclined plane portion between the cutter body, the cutter body includes the edge the cutter body axial certainly the cutter body front end to the handle of a knife orientation sets gradually be used for assistance-localization real-time's auxiliary segment, be used for milling process's processing section and be used for the cantilever section of supplementary adjustment depth of processing, the auxiliary segment with the diameter of cantilever section all is less than the diameter of processing section.

Optionally, the diameter of the processing section is 0.20-0.35 mm.

Optionally, the auxiliary section and the cantilever section have the same diameter, and the diameter of the machining section is at least 0.1mm larger than that of the cantilever section.

Optionally, the machining section comprises a spiral cutting edge and a spiral groove, the spiral cutting edge and the spiral groove are spirally arranged from the auxiliary section to the cantilever section along the axis of the machining section, and the spiral cutting edge and the spiral groove have the same spiral angle.

Optionally, the rake angle of the helical cutting edge is 1 ° to 15 °.

Optionally, the helical cutting edge has a length of 0.2-1.0 mm.

Optionally, the helix angle of the helical groove is 10 ° to 50 °.

Alternatively, the spiral direction and the tangential direction of the spiral cutting edge may be any one of a right-handed cutting type, a right-handed left-handed cutting type, a left-handed cutting type, or a left-handed right-handed cutting type.

Optionally, the front end of the auxiliary section is a plane, or the front end of the auxiliary section is provided with a drilling structure.

The utility model provides a milling tool for downthehole hole milling bore, design the cutter body into by the auxiliary section, processing section and cantilever section three are constituteed, when milling the conducting hole, earlier come assistance-localization real-time lower tool point by the auxiliary section, with confirm the distance of lower tool point to machining area, and come the position of auxiliary adjustment processing section in the conducting hole by the cantilever section, send the processing section to appointed machining area, mill the region that need not to connect in the conducting hole after to copperizing by the processing section at last, with the copper coating of detaching the downthehole unnecessary through hole section of conducting hole, the effectual reflection that causes high-speed signal transmission of avoiding, scattering and delay etc., thereby promote the integrality that the signal carried. Compared with the prior back drilling technology, the utility model discloses can be according to the needs of turn-on connection, the control mills the degree of depth, mills processing to the processing region of the same downthehole different appointed degree of depth of switch-on of PCB board, realizes the turn-on connection between the different number of piles of PCB board, its processing easy operation, and the processing cost is low.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a milling tool for milling holes in holes according to an embodiment of the present invention;

FIG. 2 is an enlarged schematic view of FIG. 1 with a drilling configuration at A;

FIG. 3 is an enlarged schematic view of FIG. 1 without the drilling structure at A;

fig. 4 is a schematic structural diagram of a milling tool for milling holes in a hole, which is provided by an embodiment of the present invention and has a rhombus-shaped machining section;

fig. 5 is a schematic structural diagram of a milling tool for milling holes in holes, which is provided by an embodiment of the present invention and has a chip-breaker-groove-type processing section;

fig. 6 is a schematic structural diagram of a milling tool for milling holes in holes, which is provided by an embodiment of the present invention and has a spiral machining section;

FIG. 7 is a schematic diagram of a via structure in a prior art backdrilling technique;

fig. 8 is a schematic view of a via hole of a milling tool for milling a hole in a hole according to an embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

It should be noted that the terms "disposed" and "connected" should be interpreted broadly, and may be, for example, directly disposed, installed, connected, or indirectly disposed and connected through intervening components and intervening structures.

In addition, in the embodiments of the present invention, if there are orientations or positional relationships indicated by "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," etc., based on the orientations or positional relationships shown in the drawings or the conventional placement state or use state, the description is only for convenience of description and simplification, but the indication or suggestion that the indicated structure, feature, device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. In the description of the present invention, "a plurality" means two or more unless otherwise specified.

The various features and embodiments described in the detailed description may be combined in any suitable manner, for example, different embodiments may be formed by combining different features/embodiments, and various combinations of features/embodiments are not separately described in order to avoid unnecessary repetition in the present disclosure.

As shown in fig. 1, fig. 2 and fig. 8, the embodiment of the utility model provides a milling tool for downthehole hole milling hole, mainly used is to the downthehole spiral milling hole of conducting hole 5 that aperture is less than or equal to 0.45mm on the PCB board 4, and the pore wall of its conducting hole 5 has copper coating 6, including handle of a knife 1 and cutter body 2, handle of a knife 1 with connect through inclined plane portion 3 between the cutter body 2, cutter body 2 includes along the axial of cutter body 2 from the front end to the auxiliary section 21 that is used for assistance-localization real time, the processing section 22 that is used for milling and the cantilever section 23 that is used for the supplementary depth of work that sets gradually of handle of a knife 1 direction, cantilever section 23 does not have the cutting ability, auxiliary section 21 with the diameter of cantilever section 23 all is less than the diameter of processing section 22. During machining, the machining equipment clamps a milling tool through the tool holder 1, the auxiliary section 21 is used for assisting positioning to determine a lower tool point so as to determine the distance from the lower tool point to the machining area 41, the cantilever section 23 is used for assisting in adjusting the position of the machining section 22 extending into the through hole 5, the machining section 22 is conveyed to the specified machining area 41, and the cutter body 2 is controlled to rotate around the central axis of the through hole 5, so that the machining section 22 is in contact with the hole wall of the through hole 5, and the specified machining area 41 is cut. The cutting device can cut processing areas 41 with different specified depths in the same via hole 5 on the PCB 4, remove copper plating layers 6 of the via hole sections which do not have the connecting function in the via hole 5, realize the conducting connection among different layers of the PCB 4, and further improve the integrity of signal transmission.

Optionally, the diameter of the processing section 22 may be 0.10-0.40mm, and the diameter of the processing section 22 is selected according to the diameter of the processed via hole 5, so that the processing section 22 can enter the via hole 5, and the processing efficiency can be effectively improved.

Preferably, the diameter of the processing section 22 may be 0.20-0.35 mm. In the embodiment of the present invention, the diameter of the processing section 22 is 0.35 mm.

Optionally, the diameters of the auxiliary section 21 and the cantilever section 23 are the same, and the diameter of the processing section 22 is at least 0.1mm larger than the diameter of the cantilever section 23 (or the auxiliary section 21); alternatively, the diameters of the auxiliary section 21 and the cantilever section 23 may be different, and when the diameter of the cantilever section 23 is larger than that of the auxiliary section 21, the diameter of the processing section 22 is at least 0.1mm larger than that of the cantilever section 23; when the diameter of the cantilever segment 23 is smaller than the diameter of the auxiliary segment 21, the diameter of the processing segment 22 is at least 0.1mm larger than the diameter of the auxiliary segment 22. Thus, during the machining process, the cantilever section 23 or the auxiliary section 21 does not interfere with the machining section 22, so that the milling depth of the machining section 22 is insufficient, and the copper plating 6 on the hole wall of the machining area 41 of the via hole 5 can be completely removed.

Specifically, the diameter of the cantilever section 23 and the auxiliary section 21 may range from 0.1mm to 0.25mm, and the length of the cantilever section 23 is from 2.5 mm to 6.5mm, and the length of the auxiliary section 21 is from 0.2 mm to 1.0 mm. The embodiment of the utility model provides an in, the diameter of cantilever section 23 and supplementary section 21 is 0.25mm, and the length of cantilever section 23 is 4.2mm, and the length of supplementary section 21 is 0.5 mm.

Alternatively, as shown in fig. 6, the processing section 22 includes a spiral cutting edge 221 and a spiral groove 222, the spiral cutting edge 221 and the spiral groove 222 are spirally arranged along the axis of the processing section 22 from the auxiliary section 21 toward the cantilever section 23, and the spiral cutting edge 221 and the spiral groove 222 have the same spiral angle.

Specifically, the number of the spiral cutting edges 221 of the processing section 22 may be 1 to 7, and the number of the corresponding spiral grooves 222 may also be 1 to 7. In the embodiment of the present invention, the number of the spiral cutting edges 221 of the processing section 22 is 3.

Alternatively, the rake angle of the helical cutting edge 221 may be 1 ° to 15 °, and by optimizing the rake angle of the helical cutting edge 221, the helical cutting edge 221 is prevented from tipping while maintaining the sharpness of the helical cutting edge 221. In the embodiment of the present invention, the rake angle of the helical cutting edge 221 is 5 °.

Alternatively, the helix angle of the helical flute 222 may be 10 ° to 50 °, which facilitates chip evacuation by optimizing the helix angle of the flute. In the embodiment of the present invention, the helical angle of the helical groove 222 is 30 °.

Optionally, the length of the helical cutting edge 221 may be 0.2-1.0mm, and the helical cutting edges 221 with different lengths are selected according to different processing requirements, so as to meet the processing requirements for different thicknesses of PCB boards.

In the embodiment of the present invention, the length of the spiral cutting edge 221 is 0.3 mm.

Alternatively, the spiral direction and the tangential direction of the spiral cutting edge 221 may be any one of a right-handed type, a right-handed left-handed type, a left-handed type, or a left-handed right-handed type. In a specific application, as shown in fig. 4, 5 and 6, the tooth shape of the helical cutting edge 221 may be a rhombus, a chip breaker, or a helical shape.

Alternatively, as shown in fig. 2, the front end of the auxiliary section 21 may be a plane without drilling capability, and the distance from the lower tool point to the machining region 41 may be determined by matching the function of the machining equipment.

As another embodiment, as shown in fig. 3, the front end of the auxiliary section 21 may be provided with a drilling structure 211 with drilling capability, i.e. auxiliary positioning is performed by the drilling structure 211. The specific operation is as follows, the PCB 4 is positioned on the table top of the drilling machine through pinning, a thin aluminum sheet is covered on the surface of the PCB 4, current can be generated when the front end of the drilling structure contacts the aluminum sheet, the position where the current is sensed by the processing equipment is used as a tool setting point (initial position), the drilling depth is calculated, and the distance from the tool setting point to the processing area 41 is obtained. The embodiment of the utility model provides an in, this drilling structure 211 can include two vice cutting edges (not shown in the figure), two chip grooves (not shown in the figure) and two main cutting edges (not shown in the figure), and two main cutting edges can be located the front end of auxiliary section, two vice cutting edge and chip groove can be followed the auxiliary section axial certainly the auxiliary section front end to processing section direction spiral setting, just the helix angle of vice cutting edge and chip groove is the same, the end of vice cutting edge and chip groove can not with the processing section is connected.

The embodiment of the utility model provides an in, the diameter of handle of a knife 1 is 3.175 0.01mm, and inclined plane portion 3 is the toper structure, and the inclination of inclined plane portion 3 is 10-20, and the inclined plane portion 3 of toper structure can be fine connect handle of a knife 1 and cutter body 2 for joint strength between two is high. Preferably, the slope of the ramp 3 is 15 °.

Optionally, the tool holder 1, the tool body 2 and the inclined plane part 3 are made of hard alloy and are of an integrally formed structure, and the overall structural strength is good; or the tool holder 1, the tool body 2 and the inclined plane part 3 are made of hard alloy and are connected through welding. In practical application, the handle 1 of the scrapped milling tool can be reused and processed into the cutter body 2 to be welded with the handle 1 and the inclined plane part 3, so that the production cost can be effectively reduced.

Optionally, the tool body 2 may be provided with a coating (not shown) for protecting the tool body 2, thereby reducing wear of the substrate of the tool body 2. In practical applications, each section of the cutter body 2 may be provided with a coating with different properties, for example, the cantilever section 23 may be attached with a lubricating coating, the processing section 22 and the auxiliary section 21 are often in contact with the via hole, and a hard coating with good wear resistance may be attached to ensure the service life and the processing precision.

The utility model also provides a processing method that is used for milling holes in PCB diaphragm orifice adopts foretell a milling tool that is used for milling holes in the hole, including following step:

starting the processing equipment, clamping the milling tool through the tool holder 1, positioning a lower tool point (namely taking the lower tool point as a reference point) by the auxiliary section 21 to determine the distance from the lower tool point to the processing area 41, then assisting and adjusting the position of the processing section 22 in the via hole 5 by the cantilever section 23 according to the distance from the lower tool point to the processing area 41, sending the processing section 22 to the specified processing area 41, controlling the tool body 2 to rotate around the central axis of the via hole 5, enabling the processing section 22 to be in contact with the hole wall of the via hole 5, milling the specified processing area 41 and removing the copper plating on the hole wall. Because the diameters of the auxiliary section 21, the processing section 22 and the cantilever section 23 are all smaller than the diameter of the via hole 5, the cutter body 2 can extend into the via hole 5, meanwhile, the diameters of the auxiliary section 21 and the cantilever section 23 are all smaller than the diameter of the processing section 22, and only the processing section 22 in the cutter body 2 has a milling function, when in processing, different areas in the via hole 5 can be milled by controlling the position of the processing section 22 in the via hole 5 without damaging the conducting connection state of the copper plating layers 6 in other areas in the via hole 5. As shown in fig. 8, for the embodiment of the utility model provides a processing sketch map of a milling tool's conducting hole for downthehole milling hole compares with traditional back drilling technique (as shown in fig. 7), and it can cut the machining area 41 of a plurality of different appointed degree of depth in the conducting hole 5 on the PCB board 4, removes the copper coating 6 that each section did not play the connection effect conducting hole section in the conducting hole 5, realizes the through connection between the different number of piles of PCB board 4, the phenomenon of effectual reduction signal distortion.

In the concrete application, the PCB 4 is positioned on the table top of the drilling machine through the pin, a metal sheet (such as an aluminum foil sheet or a copper foil sheet) is pressed on the surface of the PCB 4 and connected to the conductive circuit, when the front end of the drilling structure contacts the metal sheet, current can be generated, the position where the processing equipment senses the current is used as a tool setting point (initial position), the drilling depth is calculated, the distance from the tool setting point to the processing area 41 is obtained, the depth position is accurately controlled, and a copper coating which does not need to be processed is not damaged.

The embodiment of the utility model provides a milling tool for downthehole hole milling bore, design cutter body 2 into by auxiliary section 21, processing section 22 and cantilever section 23 three are constituteed, when milling conducting hole 5, come assistance-localization real-time lower tool point by auxiliary section 21 earlier, with the distance of confirming lower tool point to machining area 41, and come the position of auxiliary adjustment processing section 22 in conducting hole 5 by cantilever section 23, send processing section 22 to appointed machining area 41, the region that need not to connect in the conducting hole 5 after by processing section 22 at last to copperizing mills, with the copper plating layer 6 of unnecessary conducting hole section in the conducting hole 5 of detaching, the effectual reflection that causes high-speed signal transmission of avoiding, scattering and delay etc., thereby promote signal transmission's integrality. Compared with the prior back drilling technology, the utility model discloses can be according to the needs of turn-on connection, the control mills the degree of depth, mills the processing region 41 to the different appointed degree of depth in the same conducting hole 5 of PCB board 4, realizes the turn-on connection between the different number of piles of PCB board 4, its processing easy operation, and the processing cost is low.

The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modification, equivalent replacement or improvement made within the spirit and principle of the present invention should be included in the present invention.

Claims

1. The utility model provides a milling tool for downthehole hole milling bore, includes handle of a knife and cutter body, the handle of a knife with connect through the inclined plane portion between the cutter body, its characterized in that, the cutter body includes the edge the cutter body axial certainly the cutter body front end to the handle of a knife orientation sets gradually be used for the assistance-localization real-time supplementary section, be used for milling process's processing section and be used for the cantilever section of supplementary adjustment depth of processing, the supplementary section with the diameter of cantilever section all is less than the diameter of processing section.

2. A milling tool for milling a hole in a hole as defined in claim 1, wherein the diameter of the machined section is 0.20-0.35 mm.

3. A milling tool for milling a hole in a hole as defined in claim 1, wherein the auxiliary section and the cantilever section have the same diameter, and the diameter of the machining section is at least 0.1mm greater than the diameter of the cantilever section.

4. A milling tool for milling a hole in a hole as defined in claim 1, wherein the machined section includes a helical cutting edge and a helical flute, the helical cutting edge and the helical flute are helically disposed along the axis of the machined section from the auxiliary section toward the cantilevered section, and the helical cutting edge and the helical flute have the same helix angle.

5. A milling tool for milling a hole as in claim 4 wherein the rake angle of the helical cutting edge is between 1 ° and 15 °.

6. A milling tool for milling a hole as defined in claim 5, wherein the helical cutting edge has a length of 0.2-1.0 mm.

7. A milling tool for milling a hole as in claim 4 wherein the helix angle of the helical flutes is between 10 ° and 50 °.

8. A milling tool for milling a hole as defined in claim 4, wherein the helical direction and the tangential direction of the helical cutting edge may be any one of right-hand cut type, right-hand left-hand cut type, left-hand cut type or left-hand right-hand cut type.

9. A milling tool for milling a hole as in claim 1 wherein the forward end of the auxiliary section is planar or wherein the forward end of the auxiliary section is provided with a drilling feature.