CN205464476U - A drill bit for drilling of PCB board - Google Patents
A drill bit for drilling of PCB board Download PDFInfo
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- CN205464476U CN205464476U CN201520879003.7U CN201520879003U CN205464476U CN 205464476 U CN205464476 U CN 205464476U CN 201520879003 U CN201520879003 U CN 201520879003U CN 205464476 U CN205464476 U CN 205464476U
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- groove
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- drill bit
- helicla flute
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Abstract
The utility model is suitable for a drill bit technical field discloses a drill bit for drilling of PCB board, include the body, the one end of body is the drill tip, and the body has set gradually invariable section of ditch amplitude ratio and ditch amplitude ratio alternation section from drill tip one end to the other end, and the outside of body is provided with length, the weak point helicla flute that the spiral encircleed and did not cross, long, weak point helicla flute in the ditch amplitude ratio invariant of the invariable section of ditch amplitude ratio, and long helicla flute and weak point helicla flute in the ditch amplitude ratio alternation of the invariable section of ditch amplitude ratio, the short helicla flute of ditch amplitude ratio invariant section is connected with and the short staggered wrong groove of helicla flute. The utility model provides a drill bit for drilling of PCB board, it has adopted the design that does not cross of double helix groove, and in the drill bit back end, ditch amplitude ratio value is crisscross to be changed, the independent chip removal of double flute, the smear metal is difficult blocks up, and cutting temperature is steerable can to increase the thick tapering of the physical area of helicla flute cross section and core in lower scope moreover, has improved drill bit bending strength, hole site machining precision height, the processingquality of drilling is good.
Description
Technical field
This utility model belongs to drill bit structure technical field, particularly relates to a kind of drill bit for pcb board boring.
Background technology
Electronic equipment motherboard size becomes more and more less at present, and chip height is integrated and arranges the most intensive, and the positional precision in this printed circuit board (pcb board) hole to connecting chip pin is had higher requirement.Different designs person has multiple angles and mode for the borehole accuracy improving the micro-brill of PCB, and designer generally believes, for micro-brill, position, the hole precision of boring depends primarily on the rigidity of drill bit, specifically, shape of cross section, drill core thickness, helicla flute angle and flute length etc. is had to affect the factor of rigidity.
Japanese scholars star good fortune justice uses the method becoming helical angle, becoming drill core tapering, it is provided that even the Small-diameter drill of a kind of below 0.4mm also is able to realize the hole machined that hole site precision is good, and the drilling tool that practicality is the most outstanding.Traditional design concept is not still broken away from the above-mentioned design for micro-brill structural parameters.And traditional bit parameter optimization occurs bottleneck already to the lifting of drilling performance, need to set about from drill bit overall structure, carry out structure improvement.
Gush well show husband and propose a kind of double chip removing grooves new construction drill bit relative to center of rotation non-centrosymmetry, the structure of wall thickness (rigidity) is guaranteed by forming first chip area, certainly the main cutting edge also only one of which of drill bit, another chip area is arranged relative to first chip area non-centrosymmetry biasing, it is formed without main cutting edge, do not play shear action, and its flute length is less than the first chip area flute length.The long-drawn-out secondary chip area made by arranging 1 main chip area and more than 1 between wind, described secondary chip area is connected setting in 50%～95% part of the flute length of described main chip area with described main chip area, it is possible to realize stable Drilling operation.But double spiral groove crosses to design all to discharge drilling hole when position precision and drilling cuttings adversely affect relative to asymmetric design and the posterior segment helicla flute at center.Asymmetric design, because apex point centroid motion, is susceptible to chip removal and blocks, cause cutting temperature too high, single main cutting edge cutting edge serious wear during drilling in being susceptible to beat, and blind slot.And posterior segment helicla flute crosses design, its drill bit front end that crosses, easily because of insufficient rigidity, causes position, hole precision low, and the chip removal of double flute intersection easily causes and blocks up, and chip is not easy to discharge, the crudy of impact boring.
Utility model content
The purpose of this utility model is to overcome above-mentioned the deficiencies in the prior art, it is provided that a kind of drill bit for pcb board boring, and its rigidity is good, chip is prone to discharge, position, hole machining accuracy is high.
The technical solution of the utility model is: a kind of drill bit for pcb board boring, including body, one end of described body is apex point, described body is disposed with constant section of ditch amplitude ratio and ditch amplitude ratio alternate section from described apex point one end to the other end, the outside of described body is provided with spiral surrounding and the long spire groove not crossed and short helicla flute, described long spire groove and short helicla flute are constant in the ditch amplitude ratio of constant section of described ditch amplitude ratio, described long spire groove and short helicla flute are in the ditch amplitude ratio alternate of constant section of described ditch amplitude ratio, the short helicla flute of constant section of described ditch amplitude ratio connects the wrong groove staggered with described short helicla flute.
Alternatively, described ditch amplitude ratio alternate section, described long spire groove and short helicla flute have the first fabric width and second fabric width of alternate, and described first fabric width is more than described second fabric width；Constant section of described ditch amplitude ratio, described long spire groove and short helicla flute have constant fabric width, and described second fabric width is more than 0mm and less than described constant fabric width.
Alternatively, the length of constant section of described ditch amplitude ratio is more than drill bit UC section and less than the 50% of long spire groove.
Alternatively, the ditch amplitude ratio of constant section of described ditch amplitude ratio is more than or equal to 1；The ditch amplitude ratio of described ditch amplitude ratio alternate section is more than 1.
Alternatively, described wrong groove and short helicla flute joining place, the groove width of described wrong groove is equal to or more than described short spiral fluted groove width.
Alternatively, the described wrong groove width center of groove and the width of described short spiral fluted groove width center staggered positions are more than 0 and less than 0.8 times short spiral fluted groove width.
Alternatively, the core thickness tapering of described wrong groove is equal to or more than the core thickness tapering of described long spire groove.
Alternatively, when described wrong groove is parallel with described long spire groove, the groove width of described wrong groove is equal to or less than the groove width of described long spire groove.
Alternatively, described short helicla flute has obvious demarcation line with wrong groove.
Alternatively, described short spiral fluted flute length is more than or equal to drill bit UC section.
Drill bit for pcb board boring provided by the utility model, its described long spire groove and short helicla flute are constant in the ditch amplitude ratio of constant section of described ditch amplitude ratio, described long spire groove and short helicla flute are in the ditch amplitude ratio alternate of constant section of described ditch amplitude ratio, and the short helicla flute of constant section of described ditch amplitude ratio connects the wrong groove staggered with described short helicla flute.So, have employed double spiral groove not cross design, in drill bit back segment, the staggered change of ditch amplitude ratio value, double flute independence chip removal, chip is not easily blocked, cutting temperature can be controlled in relatively low scope, and can increase area and the core thickness tapering of helicla flute cross section entity, improves drill bit bending strength, position, hole machining accuracy is high, and the crudy of boring is good.
Accompanying drawing explanation
In order to be illustrated more clearly that the technical scheme in this utility model embodiment, the accompanying drawing used required in embodiment will be briefly described below, apparently, accompanying drawing in describing below is only embodiments more of the present utility model, for those of ordinary skill in the art, on the premise of not paying creative work, it is also possible to obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the schematic perspective view of the drill bit for pcb board boring that this utility model embodiment provides；
Fig. 2 is the floor map of the drill bit for pcb board boring that this utility model embodiment provides；
Fig. 3 is the floor map of the drill bit for pcb board boring that this utility model embodiment provides；
Fig. 4 is the floor map of the drill bit for pcb board boring that this utility model embodiment provides；
Fig. 5 (a) is the generalized section of B-B in Fig. 4；
Fig. 5 (b) is the generalized section of A-A in Fig. 4；
Fig. 5 (c) is the generalized section of C-C in Fig. 4；
Fig. 6 is the floor map of the drill bit for pcb board boring that this utility model embodiment provides.
Detailed description of the invention
In order to make the purpose of this utility model, technical scheme and advantage clearer, below in conjunction with drawings and Examples, this utility model is further elaborated.Should be appreciated that specific embodiment described herein, only in order to explain this utility model, is not used to limit this utility model.
It should be noted that be referred to as " being fixed on " or " being arranged at " another element when element, it can be directly on another element or may be simultaneously present centering elements.When an element is known as " being connected to " another element, and it can be directly to another element or may be simultaneously present centering elements.
Also, it should be noted the orientation term such as left and right, upper and lower in this utility model embodiment, it is only relative concept or with the normal operating condition of product as reference each other, and should not be regarded as restrictive.
As shown in Figures 1 to 6, a kind of drill bit for pcb board boring that this utility model embodiment provides, including body 10, one end of described body 10 is apex point, described body 10 is disposed with constant section of L1 of ditch amplitude ratio and ditch amplitude ratio alternate section L2 from described apex point one end to the other end, the outside of described body 10 is provided with spiral surrounding and the long spire groove 101 not crossed and short helicla flute 102, described long spire groove 101 and short helicla flute 102 are constant in the ditch amplitude ratio of described constant section of L1 of ditch amplitude ratio, described long spire groove 101 and short helicla flute 102 are in the ditch amplitude ratio alternate of described constant section of L1 of ditch amplitude ratio, the short helicla flute 102 of described constant section of L1 of ditch amplitude ratio connects the wrong groove 103 staggered with described short helicla flute 102.So, have employed double spiral groove not cross design, in drill bit back segment, the staggered change of ditch amplitude ratio value, double flute independence chip removal, chip is not easily blocked, cutting temperature can be controlled in relatively low scope, and can increase area and the core thickness tapering of helicla flute cross section entity, improves drill bit bending strength, position, hole machining accuracy is high, and the crudy of boring is good.
Specifically, in described ditch amplitude ratio alternate section L2, described long spire groove 101 and short helicla flute 102 have the first fabric width w1 and the second fabric width w2 of alternate, and described first fabric width w1 is more than described second fabric width w2.At constant section of L1 of described ditch amplitude ratio, described long spire groove 101 and short helicla flute 102 have constant fabric width w3.In figure, w4 is furrow width.Described second fabric width w2 is more than 0mm and less than described constant fabric width w3.First fabric width w1 can be more than or equal to constant fabric width w3, and drill bit bending strength is good and chip removal is effective.
Specifically, the length of described constant section of L1 of ditch amplitude ratio is more than drill bit UC section and less than long spire groove 101 or the 50% of short helicla flute 102, and drill bit bending strength is good and chip removal is effective.
Specifically, the ditch amplitude ratio of described constant section of L1 of ditch amplitude ratio is more than or equal to 1；The ditch amplitude ratio of described ditch amplitude ratio alternate section L2 is more than 1, improves chip removal effect in the case of ensureing drill bit bending strength.
Specifically, described wrong groove 103 and short helicla flute 102 joining place, the groove width of described wrong groove 103 is equal to or more than the groove width of described short helicla flute 102, to improve crudy.
Specifically, the described groove width center of wrong groove 103 is more than 0 with the width of the groove width center staggered positions of described short helicla flute 102 and is less than the groove width of 0.8 times short helicla flute 102.
Specifically, the core thickness tapering of described wrong groove 103 is equal to or more than the core thickness tapering of described long spire groove 101, and core thickness value apex point is little, and helicla flute end is big, and in positive cone, core thickness tapering is that at apex point, core is thick thick divided by groove end core.
Specifically, when described wrong groove 103 is parallel with described long spire groove 101, the groove width of described wrong groove 103 is equal to or less than the groove width of described long spire groove 101.
Specifically, described short helicla flute 102 has obvious demarcation line with wrong groove 103.
Specifically, the flute length of described short helicla flute 102 is more than or equal to drill bit UC section.
In concrete application, can first grinding long spire groove 101 and short helicla flute 102, then by wrong groove 103, short helicla flute 102 is extended to long spire groove 101 flute length.Then drill bit sharpening, bit grinding is carried on the back and cuts UC.
The drill bit for pcb board boring that this utility model embodiment is provided, its described long spire groove 101 and short helicla flute 102 are constant in the ditch amplitude ratio of described constant section of L1 of ditch amplitude ratio, described long spire groove 101 and short helicla flute 102 are in the ditch amplitude ratio alternate of described constant section of L1 of ditch amplitude ratio, and the short helicla flute 102 of described constant section of L1 of ditch amplitude ratio connects the wrong groove 103 staggered with described short helicla flute 102.So, have employed double spiral groove not cross design, in drill bit back segment, the staggered change of ditch amplitude ratio value, double flute independence chip removal, chip is not easily blocked, cutting temperature can be controlled in relatively low scope, and can increase area and the core thickness tapering of helicla flute cross section entity, improves drill bit bending strength, position, hole machining accuracy is high, and the crudy of boring is good.
The foregoing is only preferred embodiment of the present utility model, not in order to limit this utility model, all any amendment, equivalent or improvement etc. made within spirit of the present utility model and principle, within should be included in protection domain of the present utility model.
Claims (10)
1. for a drill bit for pcb board boring, including body, one end of described body is apex point, and it is special
Levying and be, described body is disposed with constant section of ditch amplitude ratio and ditch amplitude ratio from described apex point one end to the other end
Alternate section, the outside of described body is provided with spiral surrounding and the long spire groove not crossed and short helicla flute,
Described long spire groove and short helicla flute are constant in the ditch amplitude ratio of constant section of described ditch amplitude ratio, described long spire groove and
Short helicla flute is in the ditch amplitude ratio alternate of constant section of described ditch amplitude ratio, the short spiral of constant section of described ditch amplitude ratio
Groove connects the wrong groove staggered with described short helicla flute.
2. the drill bit for pcb board boring as claimed in claim 1, it is characterised in that described ditch amplitude ratio
Alternate section, described long spire groove and short helicla flute have the first fabric width and second fabric width of alternate,
And described first fabric width is more than described second fabric width；Constant section of described ditch amplitude ratio, described long spire groove and short spiral shell
Spin slot has constant fabric width, and described second fabric width is more than 0mm and less than described constant fabric width.
3. the drill bit for pcb board boring as claimed in claim 1, it is characterised in that described ditch amplitude ratio
The length of constant section is more than drill bit UC section and less than the 50% of long spire groove.
4. the drill bit for pcb board boring as claimed in claim 1, it is characterised in that described ditch amplitude ratio
The ditch amplitude ratio of constant section is more than or equal to 1；The ditch amplitude ratio of described ditch amplitude ratio alternate section is more than 1.
5. the drill bit for pcb board boring as claimed in claim 1, it is characterised in that described wrong groove with
Short helicla flute joining place, the groove width of described wrong groove is equal to or more than described short spiral fluted groove width.
6. the drill bit for pcb board boring as according to any one of claim 1 to 5, it is characterised in that
The described wrong groove width center of groove and is less than more than 0 with the width of described short spiral fluted groove width center staggered positions
0.8 times short spiral fluted groove width.
7. the drill bit for pcb board boring as according to any one of claim 1 to 5, it is characterised in that
The core thickness tapering of described wrong groove is equal to or more than the core thickness tapering of described long spire groove.
8. the drill bit for pcb board boring as according to any one of claim 1 to 5, it is characterised in that
When described wrong groove is parallel with described long spire groove, the groove width of described wrong groove is equal to or less than described long spire groove
Groove width.
9. the drill bit for pcb board boring as according to any one of claim 1 to 5, it is characterised in that
Described short helicla flute has obvious demarcation line with wrong groove.
10. the drill bit for pcb board boring as according to any one of claim 1 to 5, it is characterised in that
Described short spiral fluted flute length is more than or equal to drill bit UC section.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520879003.7U CN205464476U (en) | 2015-11-04 | 2015-11-04 | A drill bit for drilling of PCB board |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520879003.7U CN205464476U (en) | 2015-11-04 | 2015-11-04 | A drill bit for drilling of PCB board |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205464476U true CN205464476U (en) | 2016-08-17 |
Family
ID=56660571
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520879003.7U Active CN205464476U (en) | 2015-11-04 | 2015-11-04 | A drill bit for drilling of PCB board |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205464476U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105562788A (en) * | 2015-11-04 | 2016-05-11 | 深圳市金洲精工科技股份有限公司 | Drill bit for drilling PCB |
-
2015
- 2015-11-04 CN CN201520879003.7U patent/CN205464476U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105562788A (en) * | 2015-11-04 | 2016-05-11 | 深圳市金洲精工科技股份有限公司 | Drill bit for drilling PCB |
| WO2017076092A1 (en) * | 2015-11-04 | 2017-05-11 | 深圳市金洲精工科技股份有限公司 | Drill bit for drilling pcb |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |