CN102847990B - Micro blind hole drill with large taper outer diameter at front end - Google Patents
Micro blind hole drill with large taper outer diameter at front end Download PDFInfo
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- CN102847990B CN102847990B CN201110183463.2A CN201110183463A CN102847990B CN 102847990 B CN102847990 B CN 102847990B CN 201110183463 A CN201110183463 A CN 201110183463A CN 102847990 B CN102847990 B CN 102847990B
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Abstract
The invention discloses a micro blind hole drill with a large taper outer diameter at a front end. The micro blind hole drill comprises a drill body and a cylindrical drill head which is fixedly arranged at one end of the drill body, a head portion is formed at one end of the drill head away from the drill body, and the diameter of drill head close to the head portion is identical to the outer diameter of a portion between the head portion of the drill head and the drill body; one end face of the head portion away from the drill body is a tip portion, the head is conical, and the outer diameter of one end of the head portion away from the drill body is small; a cutting edge is arranged on the tip portion, the lateral surface of the head portion is connected to one end of the cutting edge, and the other end is connected to an axis of the drill head; and a spiral groove is further arranged on the drill head and starts from the cutting edge and stops on the drill head between the head portion and the drill body. The blind hole drill can reduce cutting resistance and abrasion of the drill head, improve the fineness of the hole wall, a glue slag removing step is not needed after laser hole forming, and the production efficiency is improved.
Description
Technical field
The present invention relates to a kind of front end external diameter steep-taper Microvia bores.
Background technology
At present printed wiring board is just towards the future development of " close, thin, layer is many ", and what " close " developed especially dominates and core.The number of openings reducing on plank is one of effective ways that improve printed board line density, and it can improve the density of wiring greatly.But adopt common blind hole drill point to carry out blind hole processing, usually can electroplate link at heavy copper and occur having no copper in the holes or the incomplete problem of heavy copper, be production efficiency or all can not meet the demands qualitatively, so a lot of producer has all selected laser drill.Laser drill really has certain advantage in drilling efficiency and flexibility, but the defect that laser drill also has some easily to produce, such as easily occurring the defects such as the layering of copper window, glass are given prominence to, gum residue, end copper-stripping; Laser drilling is had relatively high expectations to the thickness evenness of sheet material dielectric layer simultaneously, and the hot-working in Laser Processing (CO2 infrared laser) can not be processed thicker copper layer; And cold working (UV Ultra-Violet Laser), because the diameter of luminous point only has 15 microns conventionally, if need the aperture of boring large (such as 0.4mm), it is very low that drilling efficiency just becomes; The more important thing is, laser drill generally all needs to do the microetch of follow-up clear de-smear to be processed, like this with regard to many procedures.
Common bit diameter part is all the cylinder of inverted cone-shaped, namely the diameter footpath of the head of drill point is maximum, more up diameter is less, make like this drill point remain that the position near head contacts finished surface, reduce the area that drill point external diameter contacts with hole wall, reduce the frictional heating amount in process, improve hole wall fineness, but the processing in whole like this hole is all to lean on the head of drill point to complete, therefore can cause the cutting output of head very large, contact portion heating is very severe, the wearing and tearing of cutter have been aggravated, also can produce the problems such as sheet material internal layer medium burn thawing simultaneously.
Summary of the invention
In order to overcome above-mentioned defect, the invention provides a kind of front end external diameter steep-taper Microvia and bore, this blind hole is bored not only can reduce the wearing and tearing of cutting resistance and drill bit, and can promote the fineness of hole wall, without de-smear step after laser punching, improved production efficiency.
The present invention for the technical scheme that solves its technical problem and adopt is: a kind of front end external diameter steep-taper Microvia bores, comprise body and the cylindrical drill that is fixedly arranged on this body one end, described drill bit forms head away from one end of described body, and described head is identical to the external diameter of the part between body near the diameter of body one end and the head of described drill bit; Described head is tip away from an end face of described body, it is characterized in that: described head is truncated cone-shaped, and described head is little away from the external diameter of one end of described body; In described tip, be provided with cutting edge, one end of this cutting edge connects the lateral surface of described head, and the other end connects described drill axis; On described drill bit, be also provided with a helicla flute, this helicla flute originates in described cutting edge and ends on the drill bit between described head and body.
As a further improvement on the present invention, the lateral surface of described head and the angle of its axis are that taper angle is 20-25 °.
As a further improvement on the present invention, the lateral surface of described head and the angle of its axis are that taper angle is 25 °.
As a further improvement on the present invention, described head is that drill point angle is 148-152 ° along the angle of cutting edge described in the cross section of described cutting edge and its axis and head side upper thread.
As a further improvement on the present invention, described head is that drill point angle is 150 ° along the angle of cutting edge described in the cross section of described cutting edge and its axis and head side upper thread.
The invention has the beneficial effects as follows:
The present invention innovatively in the head design of drill point external diameter one larger along cone, if take diameter as
, taper angle is 25 °, bores to be deeply 400 microns and to calculate, the cutting output in every hole will reduce 30%; The hole hole wall coming outbreak out is bright and clean without residue, and bottom copper face is intact; Because the hole coming outbreak out is horn shape, mouthful wide end narrow, while making to electroplate,, the gas of generation can be discharged in time in the hole in, and electroplate liquid can be continued to circulate in hole, the hole wall simultaneously tilting can adhere to the copper molecule in electroplate liquid better, has guaranteed well the metallization quality in hole.
Because machine drilling is not subject to the restriction of material and copper thickness, as long as drill point performance is enough good, can disposable shaping multilayer copper foil and the thicker printed board blind hole of thickness.Due to we processing be blind hole, the bottom in hole is all generally Copper Foil, not penetrate bottom Copper Foil in order holing and to make again itself and other copper layer conducting simultaneously, therefore we are designed to 150 degree drill point angle, make apex point smoother, and general drill point is in order to improve positioning precision, all apex point is processed into 130 sharper degree, and our this drill point is due to the large tapering of being designed with of front end, even if its tip is more flat, also has and can accurately locate.General conducting for each interlayer circuit of blind hole, so bellmouth has not only reduced cutting output but also promote the quality that heavy copper is electroplated.
In a word, by process the tapering of 25 degree at drill point head, make the cutting output in every hole can reduce approximately 30%, reduced the wearing and tearing of cutting resistance and drill bit, promoted the fineness of hole wall.At the bottom of the drill point angle of 150 degree can guarantee hole better, copper layer is not destroyed.Because the hole processing is for mouthful narrow bellmouth orifice in the wide end, promoted the circulation of electroplate liquid in hole, the hole wall of inclination can adhere to the copper molecule in electroplate liquid better than vertical hole wall, has guaranteed the quality of hole metallization.After once-forming, be electrodepositable, the de-smear step without doing after laser punching, has improved production efficiency.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention;
Fig. 2 is head structure for amplifying schematic diagram of the present invention;
Fig. 3 is tip configuration schematic diagram of the present invention.
By reference to the accompanying drawings, make the following instructions:
1---body 2---drill bit
3---head 4---tip
5---cutting edge 6---helicla flute
7---taper angle 8---drill point angle
The specific embodiment
A kind of front end external diameter steep-taper Microvia bores, comprise body 1 and the cylindrical drill 2 that is fixedly arranged on this body one end, described drill bit forms head 3 away from one end of described body, and described head is identical to the external diameter of the part between body near the diameter of body one end and the head of described drill bit; Described head is tip 4 away from an end face of described body, and described head is truncated cone-shaped, and described head is little away from the external diameter of one end of described body; In described tip, be provided with cutting edge 5, one end of this cutting edge connects the lateral surface of described head, and the other end connects described drill axis; On described drill bit, be also provided with a helicla flute 6, this helicla flute originates in described cutting edge and ends on the drill bit between described head and body.
The lateral surface of above-mentioned head and the angle of its axis are that taper angle 7 is 20-25 °, are preferably made as 25 °.
Above-mentioned head is that drill point angle 8 is 148-152 ° along the angle of cutting edge described in the cross section of described cutting edge and its axis and head side upper thread, is preferably made as 150 °.
Claims (3)
1. a front end external diameter steep-taper Microvia bores, comprise body (1) and be fixedly arranged on the cylindrical drill (2) of this body one end, described drill bit forms head (3) away from one end of described body, and described head is identical to the external diameter of the part between body near the diameter of body one end and the head of described drill bit; Described head is tip (4) away from an end face of described body, it is characterized in that: described head is truncated cone-shaped, and described head is little away from the external diameter of one end of described body; In described tip, be provided with cutting edge (5), one end of this cutting edge connects the lateral surface of described head, and the other end connects described drill axis; On described drill bit, be also provided with a helicla flute (6), this helicla flute originates in described cutting edge and ends on the drill bit between described head and body; The lateral surface of described head and the angle of its axis are that taper angle (7) is 20-25 °, and described head is that drill point angle (8) is 148-152 ° along the angle of cutting edge described in the cross section of described cutting edge and its axis and head side upper thread.
2. front end external diameter steep-taper Microvia according to claim 1 bores, and it is characterized in that: the lateral surface of described head and the angle of its axis are that taper angle is 25 °.
3. front end external diameter steep-taper Microvia according to claim 1 bores, and it is characterized in that: described head is that drill point angle is 150 ° along the angle of cutting edge described in the cross section of described cutting edge and its axis and head side upper thread.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110183463.2A CN102847990B (en) | 2011-07-01 | 2011-07-01 | Micro blind hole drill with large taper outer diameter at front end |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110183463.2A CN102847990B (en) | 2011-07-01 | 2011-07-01 | Micro blind hole drill with large taper outer diameter at front end |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102847990A CN102847990A (en) | 2013-01-02 |
| CN102847990B true CN102847990B (en) | 2014-10-29 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201110183463.2A Active CN102847990B (en) | 2011-07-01 | 2011-07-01 | Micro blind hole drill with large taper outer diameter at front end |
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| CN (1) | CN102847990B (en) |
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| CN2715895Y (en) * | 2004-07-22 | 2005-08-10 | 天鹰精密工具(番禺)有限公司 | Drill bit with five blades |
| CN2820394Y (en) * | 2005-09-14 | 2006-09-27 | 江苏天工工具股份有限公司 | Filing separating strong drill |
| DE102007050050A1 (en) * | 2007-10-17 | 2009-04-23 | Kennametal Inc. | Concentric tool, especially drills |
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| US3076356A (en) * | 1960-09-19 | 1963-02-05 | Simich Emil | Cutting tool |
| US3836278A (en) * | 1972-12-14 | 1974-09-17 | Int Research & Dev Co Ltd | Tapered drill bit |
| CN2637048Y (en) * | 2003-07-21 | 2004-09-01 | 尖点科技股份有限公司 | Miniature drilling bit improved structure for printed circuit board |
| CN1817532A (en) * | 2005-02-09 | 2006-08-16 | 住友电工硬质合金株式会社 | Single-lip drill |
| CN201720498U (en) * | 2010-05-07 | 2011-01-26 | 创国精密股份有限公司 | One-blade drill structure |
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| CN102847990A (en) | 2013-01-02 |
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Address after: No.88, Shuangma Road, Ouxi Industrial Park, Dianshanhu Town, Kunshan City, Suzhou City, Jiangsu Province Patentee after: Jinzhou Jinggong Technology (Kunshan) Co.,Ltd. Address before: No.88, Shuangma Road, Ouxi Industrial Park, Dianshanhu Town, Kunshan City, Suzhou City, Jiangsu Province Patentee before: HUAWEINA PRECISION TOOLS (KUNSHAN) Co.,Ltd. |