CN110076375A - A kind of monoblock type fluted drill - Google Patents
A kind of monoblock type fluted drill Download PDFInfo
- Publication number
- CN110076375A CN110076375A CN201910367577.9A CN201910367577A CN110076375A CN 110076375 A CN110076375 A CN 110076375A CN 201910367577 A CN201910367577 A CN 201910367577A CN 110076375 A CN110076375 A CN 110076375A
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- Prior art keywords
- cutting edge
- section
- circular arc
- main cutting
- switching phase
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- 230000007704 transition Effects 0.000 claims abstract description 45
- 230000015572 biosynthetic process Effects 0.000 claims abstract description 8
- 239000007787 solid Substances 0.000 claims description 3
- 238000005299 abrasion Methods 0.000 description 3
- 238000005553 drilling Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 229910001209 Low-carbon steel Inorganic materials 0.000 description 2
- 238000005452 bending Methods 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 230000007812 deficiency Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 241001074085 Scophthalmus aquosus Species 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B51/00—Tools for drilling machines
- B23B51/02—Twist drills
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B2251/00—Details of tools for drilling machines
- B23B2251/08—Side or plan views of cutting edges
- B23B2251/082—Curved cutting edges
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B2251/00—Details of tools for drilling machines
- B23B2251/40—Flutes, i.e. chip conveying grooves
- B23B2251/408—Spiral grooves
Abstract
The invention discloses a kind of monoblock type fluted drills, including round bar shape main body；Symmetrical two spiral grooves are equipped in round bar shape main body to constitute chip space, and are equipped with first side and second side；One section of formation main cutting edge of the intersection of first side and the spiral groove, and main cutting edge is inner concave curve, the intersection of first side and the circumferential surface forms circumference sword, the main cutting edge and circumference sword junction form evagination circular arc switching phase, the another side of spiral groove is along separate main cutting edge with circular arc switching phase transition, chip removal slot tail and circumference junction are arc section transition, have to form the apex point backlash of an angle of wedge among apex point, which is made of interior cutting edge, expansion arm of angle circle and middle transition connection inner concave curve section.Higher cutting edge strength, good chip breaking ability can be achieved at the same time in the present invention, has good versatility and economical.
Description
Technical field
The present invention relates to metal knife technical fields, even more particularly to the works such as one kind slow-speed of revolution and cooling condition difference
Also the monoblock type fluted drill of stable drilling is able to achieve under the conditions of condition.
Background technique
In the drilling processing of versatile material, fluted drill main cutting edge uses inner concave shape cutting edge.Inner concave shape cutting edge can have
Effect reduces cutting load, increases chip deformation, plays an important role to the stable cutting and chip removal control of drilling process.
Disclose a kind of inner concave shape cutting edge fluted drill in Chinese patent 02119816.0, the cutter include: one can be around
The drill main body of rotation axis rotation, the main body include apex point and a shank with boring side sharp；One is formed in drill bit master
Chip space on the periphery of body, shank of the chip space from apex point to drill main body extend；And along in chip space towards
The cutting edge that the wall surface in bit direction and the boring side sharp intersection spine of drill main body are formed, wherein the cutting edge also wraps
Include the indent cutting edge smoothly extended towards the cutting edge of peripheral direction protrusion and the protrusion cutting edge.The drill bit
Since chip space tail end radius of curvature is big and tail end is to opposite direction extension, tail portion is significantly lower than chip removal at circumference maximum gauge
Trench bottom be easy to cause the disadvantages of cutter is rigidly poor, chip space is small, chip scratches hole wall.
In the prior art, there are also a kind of fluted drill, the cutter include: one can be around the drill bit master that rotation axis rotates
Body, the main body include apex point and a shank with boring side sharp；One chip space being formed on the periphery of drill main body, should
Shank of the chip space from apex point to drill main body extends, and wall surface and drill bit along chip space towards bit direction
The boring side sharp of main body intersects chamfered type cutting edge.The drill bit be simple to manufacture it is at low cost, but due to circle diameter maximum linear speed
Degree is maximum, and cutting edge strength is inadequate at this, be easy to cause boring side sharp quick abrasion.
Summary of the invention
It is an object of the invention to overcome the deficiency of the prior art, provides a kind of monoblock type fluted drill, is improved by structure,
Higher cutting edge strength, good chip breaking ability can be achieved at the same time, have good versatility and economical.
The technical solution adopted by the present invention to solve the technical problems is: a kind of monoblock type fluted drill, including round bar shape master
Body；Extend preset a distance equipped with symmetrical two to another extreme direction along circumferential surface in one end end face of round bar shape main body
Spiral groove is to constitute chip space, and the centre of one end end face of round bar shape main body is set as the apex point of protrusion, in round bar shape main body
The first side that there is the cross section relative to round bar shape main body to be inclined to set on one side for corresponding to spiral groove of one end end face
Face and second side；One section of formation main cutting edge of the intersection of the first side and the spiral groove, and main cutting edge
For inner concave curve, the intersection of the first side and the circumferential surface forms circumference sword, the main cutting edge and the circumference sword
Junction forms evagination circular arc switching phase, and evagination circular arc and the main cutting edge form an obtuse angle, the another side of spiral groove
Along far from main cutting edge, with circular arc switching phase transition, chip removal slot tail and circumference junction are arc section transition, the arc transition
Section is higher than the another side of spiral groove with circumference interface point along far from main cutting edge transition arc in the round bar shape main body section
The minimum point of switching phase has to form the apex point backlash of an angle of wedge among apex point, the backlash by interior cutting edge, expand arm of angle circle and centre
Transition connects inner concave curve section and constitutes.
It is cutting edge that the main cutting edge and circumference sword junction, which forms evagination circular arc switching phase, and cutting edge is at this at this
Radial rake α on section1≤ 0, at evagination circular arc highest point and circumference maximum gauge distance be set in 3%D to 15%D it
Between, the radius of curvature of evagination circular arc switching phase is set between 5%D to 25%D, and wherein D is bit diameter.
Further, α1Value is set between 0 ° to 35 ° of ﹣.
The main cutting edge and evagination circular arc switching phase form transition angle, transition angle be set in 135 ° to 180 ° it
Between.
The radius of curvature of the inner concave curve of the main cutting edge is set between 25%D to 50%D, spiral groove it is another
The circular arc curvature radius of the circular arc switching phase on side is set between 15%D to 35%D；Wherein D is bit diameter.
Further, the circular arc handover of radius of curvature≤spiral groove another side of the inner concave curve of the main cutting edge
The circular arc curvature radius of section.
The radius of curvature of the arc section is set between 10%D to 40%D, arc section and the direct mistake of circular arc switching phase
Cross a little that distance is set between 0.1mm to 3mm at circumference maximum gauge；The tangent line of arc section and horizontal angle α2Value is set
It is scheduled between -60 ° to 30 °, wherein D is bit diameter.
The angle of wedge is β in the apex point backlash, and β setting value is between 70 ° to 100 °.
The handover of interior cutting edge and the main cutting edge is a straight line changeover portion, the straight transitions section in the apex point backlash
It is in an angle δ with vertical line, and angle δ is set between -45 ° to 30 °, the length of straight transitions section is set in 0.02m to 3mm
Between.
In the round bar shape main body, the centre between two spiral grooves is formed by one section of minimum solid section to bore
The diameter d of core, drill core is set between 20%D to 35%D, and wherein D is bit diameter.
Compared with prior art, the beneficial effects of the present invention are:
1, the present invention is preset to the extension of another extreme direction along circumferential surface in one end end face of round bar shape main body due to using
A distance be equipped with symmetrical two spiral grooves to constitute chip space, the centre of one end end face of round bar shape main body is set as convex
Apex point out, the cross having on one side relative to round bar shape main body for corresponding to spiral groove in one end end face of round bar shape main body
The first side and second side that section is inclined to set；One section of shape of the intersection of the first side and the spiral groove
At main cutting edge, and main cutting edge is inner concave curve, and the intersection formation circumference sword of the first side and the circumferential surface is described
Main cutting edge and circumference sword junction form evagination circular arc switching phase, the another side of spiral groove along far from main cutting edge with
Circular arc switching phase transition, chip removal slot tail and circumference junction are arc section transition, have to form the apex point of an angle of wedge among apex point
Backlash, the backlash are made of interior cutting edge, expansion arm of angle circle and middle transition connection inner concave curve section.This structure of the invention,
It is straight to solve drill bit main cutting edge circumference using the lesser backlash angle of wedge by using multisection type circular arc handover transitional helix slot
Diameter maximum is due to linear velocity maximum, the problem of leading to quick abrasion, solve in chip space at main cutting edge with chip removal slot tail
Bending degree is improper, leads to machined mild steel material chip amount of crimp deficiency, the problem of chip space difference, and the row of solving
It considers slot tail to be worth doing to extend toward main cutting edge opposite direction, causes chip to be easy to scratch hole wall, the poor problem of hole wall quality can be simultaneously
It realizes higher cutting edge strength, good chip breaking ability, has good versatility and economical.
2, main cutting edge of the invention and circumference sword junction form evagination circular arc switching phase, evagination circular arc highest point and circle
Distance is set between 3%D to 15%D at all maximum gauges, the indent circular curve and evagination circular arc switching phase of main cutting edge
Joined using transition angle, compared with the design of existing arc transition, the cutting edge of evagination circular arc switching phase is on the section
Radial rake α1More flexible with the setting of radius of curvature R 1, evagination circular arc intensity and chip breaking effect are more preferable.
3, the radius of curvature of the inner concave curve radius of curvature of main cutting edge of the invention and circular arc switching phase, using curvature half
The setting that diameter successively decreases, i.e. R3≤R2 are different from the prior art the setting incremental using height circular arc handover radius of curvature, guarantee to hold
It considers space and chip-breaking performance to be worth doing, while main cutting edge intensity can be enhanced, versatility is wide.
4, chip removal slot tail and circumference junction are that arc section transition and circular arc switching phase form protrusion, with existing chip removal
The recessed technology of slot tail is compared, and is able to ascend product rigidity and is reduced chip scuffing hole wall probability.
Invention is further described in detail with reference to the accompanying drawings and embodiments；But a kind of monoblock type fried dough twist of the invention
Brill is not limited to the embodiment.
Detailed description of the invention
Fig. 1 is the top view of the embodiment of the present invention；
Fig. 2 is the schematic cross-section of the embodiment of the present invention；
Fig. 3 is the front view of the embodiment of the present invention.
In figure, 1: round bar shape main body；2: spiral groove (chip space)；3a: first side；3b: second side；4: outer dome
Arc switching phase；5: main cutting edge；6: circular arc switching phase；7: arc section；8: backlash straight transitions section；9: inner concave curve section；10: interior
Cutting edge；11: backlash expands arm of angle circle；12: cooling duct；β: the backlash angle of wedge；δ: backlash straight transitions angle；θ: main cutting edge with
Evagination circular arc switching phase angle O: round bar shape main body axis (rotation center)；O1: cutter body rotation center；D: bit diameter
(cutter body maximum gauge)；D: drill core diameter；α1: radial rake；α2: radial rake；R1: the song of evagination circular arc switching phase
Rate radius；R2: the radius of curvature of main cutting edge；R3: the radius of curvature of circular arc switching phase transition；R4: the curvature of arc section transition
Radius；H1: interface point；H2: interface point.
Specific embodiment
Embodiment
Referring to shown in Fig. 1 to Fig. 3, a kind of monoblock type fluted drill of the invention, including round bar shape main body 1；In round bar shape master
One end end face of body 1 along circumferential surface to another extreme direction extend preset a distance equipped with symmetrical two spiral grooves 2 with
Chip space is constituted, the centre of one end end face of round bar shape main body is set as the apex point of protrusion, in one end end face of round bar shape main body
The first side 3a and second that there is the cross section relative to round bar shape main body to be inclined to set on one side corresponding to spiral groove
Side 3b；One section of formation main cutting edge 5 of the intersection of the first side 3a and the spiral groove 2, and main cutting edge 5 is
The intersection of inner concave curve, the first side 3a and the circumferential surface forms circumference sword, the main cutting edge 5 and the circumference sword
Junction forms evagination circular arc switching phase 4, and evagination circular arc and the main cutting edge form an obtuse angle, spiral groove 2 it is another
Far from main cutting edge 5 with 6 transition of circular arc switching phase, 2 tail portion of chip space and circumference junction are 7 transition of arc section, the circle at edge
Arc changeover portion and circumference interface point are higher than the another side of spiral groove along far from main cutting edge mistake in the round bar shape main body section
The minimum point of circular arc switching phase is crossed, has to form the apex point backlash of an angle of wedge β among apex point, the backlash is by interior cutting edge 10, expansion angle
Boundary 11 and middle transition connection inner concave curve section 9 are constituted.
In the present embodiment, the evagination circular arc switching phase 4 of the main cutting edge 5 and the formation of circumference sword junction is cutting
Sword, radial rake α of the cutting edge on the section at this1≤ 0, evagination circular arc highest point H1 is set with distance at circumference maximum gauge
It is scheduled between 3%D to 15%D, the radius of curvature R 1 of evagination circular arc switching phase 4 is set between 5%D to 25%D, and wherein D is
Bit diameter.
Further, α1Value is set between 0 ° to 35 ° of ﹣.
In the present embodiment, the main cutting edge 5 and evagination circular arc switching phase 4 form transition angle theta, the setting of transition angle theta
Between 135 ° to 180 °.
In the present embodiment, the radius of curvature R 2 of the inner concave curve of the main cutting edge 5 is set between 25%D to 50%D,
The circular arc curvature radius R3 of the circular arc switching phase 6 of the another side of spiral groove 2 is set between 15%D to 35%D；Wherein D is
Bit diameter.
Further, the circular arc of the another side of 2≤spiral groove of radius of curvature R of the inner concave curve of the main cutting edge is handed over
Meet the circular arc curvature R3 radius of section, i.e. R2≤R3.
In the present embodiment, the radius of curvature R 4 of the arc section 7 is set between 10%D to 40%D, arc section 7 and circle
6 direct transition point H2 distance at circumference maximum gauge of arc switching phase is set between 0.1mm to 3mm；The tangent line of arc section 7
With horizontal angle α2Value is set between -60 ° to 30 °, and wherein D is bit diameter.
In the present embodiment, the angle of wedge is β in the apex point backlash, and β setting value is between 70 ° to 100 °.
In the present embodiment, the handover of interior cutting edge 10 and the main cutting edge 5 is a straight transitions in the apex point backlash
Section 8, the straight transitions section 8 and vertical line are in an angle δ, and angle δ is set between -45 ° to 30 °, the length of straight transitions section 8
Degree is set between 0.02m to 3mm.
In the present embodiment, in the round bar shape main body 1, the centre between two spiral grooves 2 is formed by one section of minimum
Solid section is drill core, and the diameter d of drill core is set between 20%D to 35%D, and wherein D is bit diameter.
A kind of monoblock type fluted drill of the invention, using in one end end face of round bar shape main body 1 along circumferential surface to another
Extreme direction extends preset a distance equipped with symmetrical two spiral grooves 2 to constitute chip space, one end of round bar shape main body 1
The centre of end face is set as the apex point of protrusion, has phase on one side corresponding to spiral groove 2 in one end end face of round bar shape main body 1
The first side 3a and second side 3b being inclined to set for the cross section of round bar shape main body；The first side 3a with it is described
One section of formation main cutting edge 5 of the intersection of spiral groove, and main cutting edge 5 is inner concave curve, the first side 3a and institute
The intersection for stating circumferential surface forms circumference sword, and the main cutting edge 5 forms evagination circular arc switching phase 4 with circumference sword junction,
The another side of spiral groove 2 is along far from main cutting edge, with 6 transition of circular arc switching phase, chip removal slot tail and circumference junction are circular arc
7 transition of section, have to form the apex point backlash of an angle of wedge β among apex point, the backlash by interior cutting edge 10, expand arm of angle circle 11 and intermediate mistake
Connection inner concave curve section 9 is crossed to constitute.This structure of the invention joins transitional helix slot by using multisection type circular arc, uses
The lesser backlash angle of wedge solves drill bit main cutting edge circle diameter maximum due to linear velocity maximum, leads to asking for quick abrasion
Topic, solve it is improper with chip removal slot tail bending degree at main cutting edge in chip space, cause machined mild steel material chip volume
Qu Chengdu is insufficient, chip space difference problem, and solves chip removal slot tail and extend toward main cutting edge opposite direction, causes to cut
Bits are easy to scratch hole wall, and higher cutting edge strength, good chip breaking ability can be achieved at the same time in the poor problem of hole wall quality, tool
Standby good versatility and economical.
A kind of monoblock type fluted drill of the invention, main cutting edge 5 and circumference sword junction form evagination circular arc switching phase 4,
Distance is set between 3%D to 15%D at evagination circular arc highest point H1 and circumference maximum gauge, the interior concave arc of main cutting edge 5
Curve and evagination circular arc switching phase 4 are joined using transition angle, compared with the design of existing arc transition, evagination circular arc switching phase
Radial rake α of 4 cutting edge on the section1More flexible, evagination circular arc intensity and chip breaking effect are set with radius of curvature R 1
Fruit is more preferable.
A kind of monoblock type fluted drill of the invention, the inner concave curve radius of curvature R 2 of main cutting edge 5 and circular arc switching phase 6
Radius of curvature R 3, the setting successively decreased using radius of curvature, i.e. R3≤R2 are different from the prior art and join curvature using height circular arc
The setting of increasing radii guarantees chip space and chip-breaking performance, while can enhance main cutting edge intensity, and versatility is wide.
A kind of monoblock type fluted drill of the invention, chip removal slot tail and circumference junction are that 7 transition of arc section and circular arc are handed over
It connects section 6 and forms protrusion, compared with the existing recessed technology of chip space tail, be able to ascend product rigidity and reduce chip scuffing hole wall
Probability.
Above-mentioned only presently preferred embodiments of the present invention, is not intended to limit the present invention in any form.Although of the invention
It has been disclosed in a preferred embodiment above, however, it is not intended to limit the invention.Anyone skilled in the art is not taking off
In the case where from technical solution of the present invention range, all technical solution of the present invention is made perhaps using the technology contents of the disclosure above
Mostly possible changes and modifications, or it is revised as equivalents equivalent embodiment.Therefore, all without departing from technical solution of the present invention
Content, technical spirit any simple modifications, equivalents, and modifications made to the above embodiment, should all fall according to the present invention
In the range of technical solution of the present invention protection.
Claims (10)
1. a kind of monoblock type fluted drill, including round bar shape main body；In one end end face of round bar shape main body along circumferential surface to the other end
Direction extends preset a distance equipped with symmetrical two spiral grooves to constitute chip space, one end end face of round bar shape main body
Centre be set as protrusion apex point, one end end face of round bar shape main body correspond to spiral groove on one side have relative to circle
The first side and second side that the cross section of stick main body is inclined to set；It is characterized by: the first side with it is described
One section of formation main cutting edge of the intersection of spiral groove, and main cutting edge is inner concave curve, the first side and the week
The intersection in face forms circumference sword, and the main cutting edge and circumference sword junction form evagination circular arc switching phase, and evagination
Circular arc and the main cutting edge form an obtuse angle, the another side of spiral groove along far from main cutting edge with circular arc switching phase transition,
Chip removal slot tail and circumference junction are arc section transition, and the arc transition section and circumference interface point are in the round bar shape main body section
In be higher than the another side of spiral groove to form a wedge along the minimum point far from main cutting edge transition arc switching phase, among apex point
The apex point backlash at angle, the backlash are made of interior cutting edge, expansion arm of angle circle and middle transition connection inner concave curve section.
2. monoblock type fluted drill according to claim 1, it is characterised in that: the main cutting edge and circumference sword junction
Formation evagination circular arc switching phase is cutting edge, radial rake α of the cutting edge on the section at this1≤ 0, evagination circular arc highest point
It is set between 3%D to 15%D with distance at circumference maximum gauge, the radius of curvature of evagination circular arc switching phase is set in 5%D
To between 25%D, wherein D is bit diameter.
3. monoblock type fluted drill according to claim 2, it is characterised in that: further, α1Value be set in 0 ° to 35 ° of ﹣ it
Between.
4. monoblock type fluted drill according to claim 1, it is characterised in that: the main cutting edge and evagination circular arc switching phase
Transition angle be set between 135 ° to 180 °.
5. monoblock type fluted drill according to claim 1, it is characterised in that: the curvature of the inner concave curve of the main cutting edge
Radius is set between 25%D to 50%D, and the circular arc curvature radius of the circular arc switching phase of the another side of spiral groove is set in
Between 15%D to 35%D；Wherein D is bit diameter.
6. monoblock type fluted drill according to claim 5, it is characterised in that: further, the indent of the main cutting edge
The circular arc curvature radius of the circular arc switching phase of radius of curvature≤spiral groove another side of curve.
7. monoblock type fluted drill according to claim 1, it is characterised in that: the radius of curvature of the arc section is set in
Between 10%D to 40%D, the distance at circumference maximum gauge is set in arc section with the direct transition point of circular arc switching phase
Between 0.1mm to 3mm；The tangent line of arc section and horizontal angle α2Value is set between -60 ° to 30 °, and wherein D is drill bit
Diameter.
8. monoblock type fluted drill according to claim 1, it is characterised in that: the angle of wedge is β, β setting in the apex point backlash
Value is between 70 ° to 100 °.
9. monoblock type fluted drill according to claim 8, it is characterised in that: in the apex point backlash interior cutting edge with it is described
The handover of main cutting edge is a straight line changeover portion, and the straight transitions section and vertical line are in an angle δ, and angle δ is set in -45 °
To between 30 °, the length of straight transitions section is set between 0.02m to 3mm.
10. monoblock type fluted drill according to claim 1, it is characterised in that: in the round bar shape main body, two spirals are recessed
It is drill core that centre between slot, which is formed by one section of minimum solid section, and the diameter d of drill core is set between 20%D to 35%D,
Wherein D is bit diameter.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910367577.9A CN110076375A (en) | 2019-05-05 | 2019-05-05 | A kind of monoblock type fluted drill |
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|---|---|---|---|
| CN201910367577.9A CN110076375A (en) | 2019-05-05 | 2019-05-05 | A kind of monoblock type fluted drill |
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ID=67418474
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| CN201910367577.9A Pending CN110076375A (en) | 2019-05-05 | 2019-05-05 | A kind of monoblock type fluted drill |
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