CN100368115C - Method for improving service life of rolled spiral drill - Google Patents
Method for improving service life of rolled spiral drill Download PDFInfo
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- CN100368115C CN100368115C CNB2005100388412A CN200510038841A CN100368115C CN 100368115 C CN100368115 C CN 100368115C CN B2005100388412 A CNB2005100388412 A CN B2005100388412A CN 200510038841 A CN200510038841 A CN 200510038841A CN 100368115 C CN100368115 C CN 100368115C
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- rolled spiral
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- 238000000034 method Methods 0.000 title claims abstract description 17
- 238000005520 cutting process Methods 0.000 abstract description 13
- 238000004519 manufacturing process Methods 0.000 abstract description 6
- 238000005516 engineering process Methods 0.000 abstract description 3
- 239000002184 metal Substances 0.000 abstract description 2
- 239000000110 cooling liquid Substances 0.000 abstract 1
- 239000000463 material Substances 0.000 description 8
- 238000005553 drilling Methods 0.000 description 5
- 239000012809 cooling fluid Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 238000003754 machining Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
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Abstract
The present invention relates to a method for improving the service life of a rolled spiral drill, which belongs to the manufacturing technology of metal cutting tools. The method is characterized in that the size parameters of the rolled spiral drill are adjusted on the basis of the basic structure of the existing standard rolled spiral drill to enable the size parameters of rolled spiral drill to meet the following requirements: a. the fillet radius R of the flute tail of the rolled spiral drill is controlled between 20mm and 30mm; b. the core thickness of the rolled spiral drill is increased in geometric proportion in the direction from the head to the flute tail, wherein the incrementary ratio of the core thickness (namely the ratio between the core thickness of a measuring cross section and the distance between the measuring cross section and the tip of the spiral drill) is 2.0mm: 100mm to 2.5mm: 100mm. The rolled spiral drill manufactured by the method of the present invention has the advantage that the service life of a drill bit is greatly improved under the cutting conditions of high cutting speed, high tensile strength of test blanks and no cooling liquid.
Description
Technical field
The invention belongs to the metal cutting tool manufacturing technology, relate to a kind of rolled spiral drill method in service life that improves.
Background technology
Be the important quality index of rolled spiral drill service life, under some abominable machining conditions, particularly under the machining condition of high cutting speed, high examination base tensile strength, no cooling fluid, can shorten greatly the service life of common fluted drill, even be difficult to finish working angles.
Summary of the invention
Technical problem to be solved by this invention is, a kind of rolled spiral drill method in service life that improves is provided, and makes fluted drill in high cutting speed, high examination base tensile strength and do not have and can have under the cooling fluid condition long service life.
Method of the present invention is on the basic structure basis of existing standard rolled spiral drill its dimensional parameters to be adjusted, and makes it satisfy following the requirement:
A. the radius of corner R with rolled spiral drill groove tail is controlled at 20mm～30mm;
B. the thick amount of core of rolled spiral drill is increased by head geometric ratio to the groove tail direction, its incremental raio (promptly measuring the thick amount of core in cross section and this measurement cross section to the ratio between the distance at fluted drill tip) is 2.0: 100mm～2.25mm: 100mm;
C. make between the thick amount K of end core of rolled spiral drill and the bit diameter d and satisfy following relation, be i.e. K=(0.24～0.25) d
0.87
D. make between land width B, bit diameter d and the fluted drill helixangle of rolled spiral drill and satisfy following relation, promptly B=0.697dcos β satisfies following relation between land diameter g and the bit diameter d, i.e. d＞g 〉=0.96d simultaneously;
E. the chisel edge angle α with rolled spiral drill is controlled at 55 °～60 °.
The present invention compares with common rolled spiral drill, the rigidity of drill bit when cutting improves greatly, and analyze by experiment, in high cutting speed, high examination base tensile strength and do not have under the machining condition of cooling fluid, improve drill bit rigidity, the vibration when reducing to cut is to there being crucial effect the service life that prolongs drill bit.The present invention is by taking to increase fried dough twist drill flute tail radius, increase the fluted drill core thickness increments, suitably increase the thick amount of core, increasing measures such as land width and land diameter in right amount, drill bit rigidity is effectively improved, simultaneously by increasing the chisel edge angle shortening chisel edge length, thus the axial force when reducing drilling.Through evidence, the rolled spiral drill that adopts the inventive method to make, in high cutting speed, high examination base tensile strength and do not have under the machining condition of cooling fluid, be greatly enhanced the service life of drill bit.
Description of drawings
Fig. 1 is the schematic diagram that shows fluted drill core thickness increments and groove tail fillet;
Fig. 2 is the schematic diagram that shows fluted drill land width B;
Fig. 3 is the schematic diagram that shows fluted drill core land diameter g;
Fig. 4 is the schematic diagram that shows fluted drill chisel edge angle α.
The R that annotates is that groove tail radius, B are that land width, g are that land diameter, α are the chisel edge angle among the figure.
The specific embodiment
Embodiment one: the rolled spiral drill that adopts three diameter d=4mm of the inventive method manufacturing, its drill bit material is W6Mo5Cr4V2, and its groove tail radius, core thickness increments ratio, the thick amount of core of end, land width, land diameter, chisel edge angle parameters see Table the test group in 1.Other parameter complies with the national standard requirements.
With the drill bit of embodiment one and a material that meets national standard is the common rolled spiral drill of the W6Mo5Cr4V2 contrast test of holing.Experimental condition is: cutting speed 25m/min, amount of feeding 0.07mm/r, speed of mainshaft 2000r/min, drilling depth 12mm, examination base tensile strength 1000～1150N/mm
2Result of the test such as table 1:
Table 1
| Groove tail radius (mm) | The core thickness increments ratio | The thick amount of end core (mm) | Land width (mm) | Land diameter (mm) | The chisel edge angle | Life-span (boring number) | ||
| Test group | 1 | R22 | 2.14∶100 | 0.85 | 2.50 | 3.99 | 55 · | 110 |
| 2 | R22 | 2.00∶100 | 0.86 | 2.47 | 3.992 | 56 · | 110 | |
| 3 | R22 | 2.2∶100 | 0.83 | 2.48 | 3.99 | 55 · | 110 | |
| Control group | 1 | R10 | 1.86∶100 | 0.70 | 2.40 | 3.72 | 50 · | 6 |
| 2 | R10 | 1.94∶100 | 0.68 | 2.42 | 3.80 | 48 · | 17 | |
| 3 | R10 | 1.75∶100 | 0.73 | 2.38 | 3.76 | 52 · | 22 | |
Annotate: the boring number reaches 110 holes/part and stops examination.
Embodiment two: the rolled spiral drill that adopts three diameter d=6mm of the inventive method manufacturing, its drill bit material is W6Mo5Cr4V2, and its groove tail radius, core thickness increments ratio, the thick amount of core of end, land width, land diameter, chisel edge angle parameters see Table the test group in 1.Other parameter complies with the national standard requirements.
With the drill bit of embodiment two and a material that meets national standard is the common rolled spiral drill of the W6Mo5Cr4V2 contrast test of holing.Experimental condition is: cutting speed 23m/min, amount of feeding 0.10mm/r, speed of mainshaft 1250r/min, drilling depth 18mm, examination base tensile strength 1000～1150N/mm
2Result of the test such as table 2:
Table 2
| Groove tail radius (mm) | The core thickness increments ratio | The thick amount of end core (mm) | Land width (mm) | Land diameter (mm) | The chisel edge angle | Life-span (boring number) | ||
| Test group | 1 | R25 | 2.18∶100 | 1.19 | 3.73 | 5.985 | 55 · | 110 |
| 2 | R25 | 2.25∶100 | 1.18 | 3.75 | 5.988 | 57 · | 110 | |
| 3 | R25 | 2.11∶100 | 1.14 | 3.73 | 5.99 | 55 · | 110 | |
| Control group | 1 | R12 | 1.66∶100 | 1.03 | 3.58 | 5.58 | 48 · | 12 |
| 2 | R12 | 1.73∶100 | 1.00 | 3.60 | 5.60 | 50 · | 17 | |
| 3 | R12 | 1.69∶100 | 1.02 | 3.58 | 5.65 | 49 · | 7 | |
Annotate: the boring number reaches 110 holes/part and stops examination.
Embodiment three: the rolled spiral drill that adopts three diameter d=8mm of the inventive method manufacturing, its drill bit material is W6Mo5Cr4V2, and its groove tail radius, core thickness increments ratio, the thick amount of core of end, land width, land diameter, chisel edge angle parameters see Table the test group in 1.Other parameter complies with the national standard requirements.
With the drill bit of embodiment three and a material that meets national standard is the common rolled spiral drill of the W6Mo5Cr4V2 contrast test of holing.Experimental condition is: cutting speed 20m/min, amount of feeding 0.12mm/r, speed of mainshaft 800r/min, drilling depth 24mm, examination base tensile strength 1000～1150N/mm
2Result of the test such as table 3:
Table 3
| Groove tail radius (mm) | The core thickness increments ratio | The thick amount of end core (mm) | Land width (mm) | Land diameter (mm) | The chisel edge angle | Life-span (boring number) | ||
| Test group | 1 | R28 | 2.00∶100 | 1.51 | 5.03 | 7.985 | 55 · | 110 |
| 2 | R28 | 2.18∶100 | 1.44 | 5.02 | 7.985 | 56 · | 110 | |
| 3 | R28 | 2.13∶100 | 1.46 | 5.00 | 7.99 | 55 · | 110 | |
| Control group | 1 | R14 | 1.80∶100 | 1.30 | 4.73 | 7.48 | 48 · | 11 |
| 2 | R14 | 1.75∶100 | 1.38 | 4.75 | 7.50 | 52 · | 19 | |
| 3 | R14 | 1.83∶100 | 1.29 | 4.70 | 4.45 | 47 · | 15 | |
Annotate: the boring number reaches 110 holes/part and stops examination.
Embodiment four: the rolled spiral drill that adopts three diameter d=8mm of the inventive method manufacturing, its drill bit material is W6Mo5Cr4V2, and its groove tail radius, core thickness increments ratio, the thick amount of core of end, land width, land diameter, chisel edge angle parameters see Table the test group in 1.Other parameter complies with the national standard requirements.
With the drill bit of embodiment four and a material that meets national standard is the common rolled spiral drill of the W6Mo5Cr4V2 contrast test of holing.Experimental condition is: cutting speed 18m/min, amount of feeding 0.15mm/r, speed of mainshaft 575r/min, drilling depth 30mm, examination base tensile strength 1000～1150N/mm
2Result of the test such as table 4:
Table 4
| Groove tail radius (mm) | The core thickness increments ratio | The thick amount of end core (mm) | Land width (mm) | Land diameter (mm) | The chisel edge angle | Life-span (boring number) | ||
| Test group | 1 | R30 | 2.10∶100 | 1.74 | 5.90 | 9.92 | 55 · | 110 |
| 2 | R30 | 2.02∶100 | 1.76 | 5.93 | 9.99 | 56 · | 110 | |
| 3 | R30 | 2.00∶100 | 1.78 | 5.58 | 9.99 | 55 · | 110 | |
| Control group | 1 | R15 | 1.61∶100 | 1.59 | 6.22 | 9.40 | 48 · | 17 |
| 2 | R15 | 1.64∶100 | 1.63 | 6.20 | 9.45 | 50 · | 22 | |
| 3 | R15 | 1.60∶100 | 1.60 | 6.27 | 9.50 | 47 · | 16 | |
Annotate: the boring number reaches 110 holes/part and stops examination.
Claims (4)
1. one kind is improved the rolled spiral drill method in service life, it is characterized in that: make the dimensional parameters of rolled spiral drill satisfy following requirement,
The radius of corner R of rolled spiral drill groove tail is controlled at 20mm～30mm;
The thick amount of core of rolled spiral drill is increased by head geometric ratio to the groove tail direction, and its incremental raio is 2.0: 100mm～2.25mm: 100mm.
2. a kind of rolled spiral drill method in service life that improves according to claim 1 is characterized in that: make the dimensional parameters of rolled spiral drill satisfy following requirement,
Make between the thick amount K of end core of rolled spiral drill and the bit diameter d and satisfy following relation, be i.e. K=(0.24～0.25) d
0.87
3. a kind of rolled spiral drill method in service life that improves according to claim 2 is characterized in that: make the dimensional parameters of rolled spiral drill satisfy following requirement,
Make between land width B, bit diameter d and the fluted drill helixangle of rolled spiral drill and satisfy following relation, promptly B=0.697dcos β satisfies following relation between land diameter g and the bit diameter d, i.e. 0.96d≤g＜d simultaneously.
4. a kind of rolled spiral drill method in service life that improves according to claim 3 is characterized in that: make the dimensional parameters of rolled spiral drill satisfy following requirement,
The chisel edge angle α of rolled spiral drill is controlled at 55 °～60 °.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100388412A CN100368115C (en) | 2005-04-10 | 2005-04-10 | Method for improving service life of rolled spiral drill |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100388412A CN100368115C (en) | 2005-04-10 | 2005-04-10 | Method for improving service life of rolled spiral drill |
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| Publication Number | Publication Date |
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| CN1843654A CN1843654A (en) | 2006-10-11 |
| CN100368115C true CN100368115C (en) | 2008-02-13 |
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| CNB2005100388412A Active CN100368115C (en) | 2005-04-10 | 2005-04-10 | Method for improving service life of rolled spiral drill |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101176930B (en) * | 2007-11-30 | 2011-11-16 | 深圳市金洲精工科技股份有限公司 | Minisize drill bit for PCB plate drilling hole |
| US8926237B2 (en) * | 2011-07-11 | 2015-01-06 | Kennametal Inc. | Multi-piece twist drill head and twist drill including the same |
| CN108057918B (en) * | 2017-12-29 | 2024-05-24 | 广东工业大学 | PCB miniature drill bit |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4968193A (en) * | 1986-08-18 | 1990-11-06 | Black & Decker Corporation | Self-centering drill bit with pilot tip |
| US5622462A (en) * | 1995-04-11 | 1997-04-22 | Credo Tool Company | Twist drill bit |
| US5947659A (en) * | 1995-07-27 | 1999-09-07 | Mays; Ralph C. | Drill bit |
| JP2002144125A (en) * | 2000-08-31 | 2002-05-21 | Mitsubishi Materials Corp | Boring tool |
| US6601659B2 (en) * | 2001-05-17 | 2003-08-05 | Hilti Aktiengesellschaft | Twist drill |
| WO2004082874A1 (en) * | 2003-03-21 | 2004-09-30 | Gühring, Jörg | Sandwich drill |
-
2005
- 2005-04-10 CN CNB2005100388412A patent/CN100368115C/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4968193A (en) * | 1986-08-18 | 1990-11-06 | Black & Decker Corporation | Self-centering drill bit with pilot tip |
| US5622462A (en) * | 1995-04-11 | 1997-04-22 | Credo Tool Company | Twist drill bit |
| US5947659A (en) * | 1995-07-27 | 1999-09-07 | Mays; Ralph C. | Drill bit |
| JP2002144125A (en) * | 2000-08-31 | 2002-05-21 | Mitsubishi Materials Corp | Boring tool |
| US6601659B2 (en) * | 2001-05-17 | 2003-08-05 | Hilti Aktiengesellschaft | Twist drill |
| WO2004082874A1 (en) * | 2003-03-21 | 2004-09-30 | Gühring, Jörg | Sandwich drill |
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|---|---|
| CN1843654A (en) | 2006-10-11 |
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Owner name: JIANGSU FEIDA BIT CO., LTD. Free format text: FORMER OWNER: JIANGSU FEIDA TOOLS CO., LTD. Effective date: 20100609 |
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Free format text: CORRECT: ADDRESS; FROM: 212312 GAOSHIQIAO DEVELOPMENT AREA, HOUXIANG TOWN, DANYANG CITY, JIANGSU PROVINCE TO: 212312 JIANGSU FEIDA DRILL CO., LTD., GAOSHIQIAO DEVELOPMENT ZONE, HOUXIANG TOWN, DANYANG CITY, JIANGSU PROVINCE |
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Effective date of registration: 20100609 Address after: 212312 Danyang City, Jiangsu province Zhen gaoshiqiao Development Zone Jiangsu Feida bit Limited by Share Ltd Patentee after: Jiangsu Feida Drills Co., Ltd. Address before: 212312 Danyang City, Jiangsu province Zhen gaoshiqiao Development Zone Patentee before: Jiangsu Feida Tools Co., Ltd. |
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Effective date of registration: 20220424 Address after: 212300 Dan Bei Zhen Hou Xiang Fei Da Cun, Danyang City, Zhenjiang City, Jiangsu Province Patentee after: Jiangsu jueke CNC Tool Co.,Ltd. Address before: 212312 Jiangsu Feida bit Co., Ltd., gaoshiqiao Development Zone, HouXiang Town, Danyang City, Jiangsu Province Patentee before: JIANGSU FEIDA DRILLS Co.,Ltd. |