CN206492963U - A kind of double end centre drill - Google Patents
A kind of double end centre drill Download PDFInfo
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- CN206492963U CN206492963U CN201720146899.7U CN201720146899U CN206492963U CN 206492963 U CN206492963 U CN 206492963U CN 201720146899 U CN201720146899 U CN 201720146899U CN 206492963 U CN206492963 U CN 206492963U
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Abstract
The utility model discloses a kind of double end centre drill, it is related to cutting-tool engineering field, including cylinder handle of a knife and it is arranged on the drill bit at handle of a knife two ends, drill bit includes centre drill section and drilling section, drill bit is arranged with two chip removal straight troughs, chip removal straight trough parallel to drill bit central axis, centre drill section front end the conical surface on be arranged with two main cutting edges, the chip removal straight trough edge overlapped with main cutting edge provided with width for b1 face of cylinder land.Drilling operation is carried out using the drill bit provided with chip removal straight trough, chip breaking is smooth and chip is tiny, it is not easy to form built-up edge, the processing of centre bore and shallow bore hole is disposably completed using centre drill section and drilling section, the face of cylinder land of chip removal straight trough edge makes drill bit and workpiece have 2 contact surfaces simultaneously, make centre drill section work in-process more stable, circularity and the higher hole of linearity can be processed, so as to improve machining accuracy.The utility model is particularly suitable for use in the processing of stepped hole, and superiority is had more for the metal for producing the bits that are chopped.
Description
Technical field
The utility model is related to cutting-tool engineering field, more particularly to a kind of double end centre drill.
Background technology
The processing for being machined mesopore is most common one kind, and the feelings in machining center hole are needed for some shallow bore hole bottom holes
Condition, generally using getting out shallow bore hole with fluted drill in advance, then processes with centre drill centre bore, so not only operating efficiency
Low, process is more, causes production cost to increase, and the axiality of shallow bore hole and centre bore is not easy to ensure.
Utility model content
Technical problem to be solved in the utility model is that there is provided a kind of operating efficiency for above-mentioned the deficiencies in the prior art
High, the double end centre drill of good processing accuracy.
In order to solve the above technical problems, technical solution adopted in the utility model is：
A kind of double end centre drill, including cylinder handle of a knife and the drill bit for being arranged on handle of a knife two ends, the drill bit include center
Section and drilling section are bored, the drill bit is arranged with two chip removal straight troughs, and the chip removal straight trough is parallel to the central axis of drill bit, institute
Two main cutting edges are arranged with the conical surface for stating centre drill section front end, the chip removal straight trough edge of main cutting edge end is provided with width
Spend the face of cylinder land for b1.
Preferably, the drilling section includes right on the first drilling section and the second drilling section, the conical surface of the first drilling section
Claim to be provided with two the first drilling swords, the conical surface of the second drilling section and be arranged with two the second drilling swords, shown first bores
The chip removal straight trough edge for cutting sword and the second drilling sword end is equipped with circular conical surface land.
Preferably, the cutting edge side of the main cutting edge between its relief angle α be provided with the first inclined-plane land, first drilling
The cutting edge side of sword to being provided with the second inclined-plane land between its relief angle α ', the cutting edge side of the second drilling sword to its relief angle α ' ' it
Between be provided with the 3rd inclined-plane land.
Preferably, the entity part between the chip removal straight trough edge and face of cylinder land is parallel to drill bit central axis
Transition circle cambered surface, the diameter of cylinder where the diameter D1 of cylinder is less than face of cylinder land where the transition circle cambered surface.
It is preferred that, the chip removal straight trough root arc transition and knuckle radius R are 0.5mm, the angle of the chip removal straight trough
Q is 90 °；The edge of two chip removal straight trough respective sides is parallel to each other and apart from for L.
Preferably, the width b2 of first inclined-plane land is 0.4mm, first inclined-plane land and main cutting edge place
Cutting plane B angles β is that the relief angle α at 8 °, the main cutting edge is 28 °；The width b3 of second inclined-plane land is
Cutting plane C angles β ' where 0.6mm, second inclined-plane land and the first drilling sword is at 8 °, the first drilling sword
Relief angle α ' is 25 °；The width b4 of the 3rd inclined-plane land is 0.8mm, the 3rd inclined-plane land and the second drilling sword place
Cutting plane E angles β ' ' is that the relief angle α ' ' at 8 °, the second drilling sword is 25 °；Two chip removal straight trough respective sides are mutually put down
Capable Edge Distance L is 0.4mm.
Preferably, the frustoconical bevel angle n of the first drilling section is 60 °, and the frustoconical bevel angle p of the second drilling section is 90 °；
The frustoconical bevel angle γ of the centre drill section front end is 120 °.
Preferably, the chip removal straight trough afterbody extends to handle of a knife, and the chip removal straight trough side on handle of a knife face is straight flange, side
For arc-shaped edges, the depth of the chip removal straight trough end to drill bit rear end is from shallow to deep.
Preferably, the handle of a knife and two ends drill bit are integral type structure.
It is using the beneficial effect produced by above-mentioned technical proposal：Drilling is carried out using the drill bit provided with chip removal straight trough to add
Work, chip breaking is smooth and chip is tiny, is not easy to form built-up edge, while disposably completing center using centre drill section and drilling section
Hole and the processing of shallow bore hole, while the face of cylinder land of chip removal straight trough edge makes drill bit and workpiece have 2 contact surfaces, make centre drill
Section work in-process is more stable, circularity and the higher hole of linearity can be processed, so as to improve machining accuracy.The utility model
Be particularly suitable for use in the processing of stepped hole, and superiority is had more for the metal for producing the bits that are chopped.
Brief description of the drawings
Fig. 1 is a kind of structural representation for double end centre drill that the utility model embodiment is provided；
Fig. 2 is the A direction views of centre drill section in Fig. 1；
In figure：1- handle of a knifes, 2- centre drills section, 3- chip removal straight troughs, 4- main cutting edges, 5- faces of cylinder land, 6- first drills
Section, the drilling sections of 7- second, 8- circular conical surface lands, the first inclined-planes of 9- land, the second inclined-planes of 10- land, the inclined-plane lands of 11- the 3rd,
12- transition circle cambered surfaces.
Embodiment
In order that the purpose of this utility model, technical scheme and advantage are more clearly understood, below in conjunction with accompanying drawing and specifically
Embodiment, is described in further detail to the utility model.It should be appreciated that specific embodiment described herein is only used to
The utility model is explained, is not used to limit the utility model.
A kind of double end centre drill that the utility model is provided, as shown in Figure 1, 2, including cylinder handle of a knife 1 and is arranged on knife
The drill bit at the two ends of handle 1, the drill bit includes centre drill section 2 and drilling section, and the drill bit is arranged with two chip removal straight troughs 3, institute
State and be arranged with two main cutting edges on central axis of the chip removal straight trough 3 parallel to drill bit, the conical surface of 2 front ends of centre drill section
4, the edge of chip removal straight trough 3 of the shown end of main cutting edge 4 is provided with the face of cylinder land 5 that width is b1.By in chip removal straight trough
Outer rim at sharpen out face of cylinder land, make centre drill section with workpiece have 2 contact surfaces, work in-process is more stable, so as to
To improve machining accuracy.
In a preferred embodiment of the present utility model, the drilling section includes the first drilling drilling section of section 6 and second
7, two the first drilling swords are arranged with the conical surface of the first drilling section 6, are symmetrically set on the conical surface of the second drilling section 7
There are two the second drilling swords, the edge of chip removal straight trough 3 of shown first drilling sword and the second drilling sword end is equipped with circular conical surface
Land 8, equally makes the first drilling section and the second drilling section have 2 contact surfaces with workpiece, work in-process is more stable, so as to
Improve machining accuracy.
Further, the cutting edge side of the main cutting edge 4 between its relief angle α be provided with the first inclined-plane land 9, described first
The cutting edge side of drilling sword is to being provided with the second inclined-plane land 10, the cutting edge side of the second drilling sword to its relief angle between its relief angle α '
The part sectioned view being provided between α ' ' in the 3rd inclined-plane land 11, Fig. 1 is respectively main cutting edge, the first drilling sword and the second brill
Cut schematic diagram of the sword in principal section.Brill can be reduced by the first inclined-plane land, the inclined-plane land of the second inclined-plane land season the 3rd
Influence of the head vibrations to finished surface, while can also ensure that has sufficient gap in working angles between workpiece and drill bit,
Also chip breaking is avoided to scratch finished surface.
In order to improve borehole accuracy, the entity part between the edge of chip removal straight trough 3 and face of cylinder land 5 is parallel to brill
The transition circle cambered surface 12 of head central axis, the diameter D1 of the place cylinder of transition circle cambered surface 12 is less than the institute of face of cylinder land 5
In the diameter of cylinder, chip breaking can be avoided to damage the hole inwall of machined mistake, it is ensured that crudy.
In order to improve stiffness of twist drill, reduce stress and produce, the root arc transition of chip removal straight trough 3 and knuckle radius R is
0.5mm, the angle Q of the chip removal straight trough 3 is 90 °；The edge of two respective sides of chip removal straight trough 3 is parallel to each other and apart from for L.
In a specific embodiment of the present utility model, the width b2 of first inclined-plane land 9 is 0.4mm, described
The first inclined-plane land 9 and place cutting plane B angles β of main cutting edge 4 is that the relief angle α at 8 °, the main cutting edge 4 is 28 °；Institute
The width b3 for stating the second inclined-plane land 10 is 0.6mm, and cutting plane C is pressed from both sides where second inclined-plane land 10 and the first drilling sword
Angle beta ' it is 8 °, the relief angle α ' at the first drilling sword is 25 °；The width b4 of the 3rd inclined-plane land 11 is 0.8mm, described
Cutting plane E angles β ' ' where 3rd inclined-plane land 11 and the second drilling sword is the relief angle α ' ' at 8 °, the second drilling sword
For 25 °；The Edge Distance L that two respective sides of chip removal straight trough 3 are parallel to each other is 0.4mm.In the present embodiment, transition circle cambered surface 12
The diameter D1 of place cylinder is 2.75mm, and the diameter D2 of the place cylinder of face of cylinder land 5 is 3.15mm, and shank diameter D3 is
12, the D3 upper deviation is that -0.003mm, lower deviation are -0.012mm；The length of straigh line of centre drill section is 4 ± 0.2mm, drill bit
Length be 10.6 ± 0.2mm, the length of chip removal straight trough is 15mm.
Wherein, the frustoconical bevel angle n of the first drilling section 6 is 60 °, can also be adjusted and bored according to the specific requirement in processing hole
Face angle degree；The frustoconical bevel angle p of the second drilling section 7 is 90 °, and the frustoconical bevel angle γ of 1 front end of centre drill section is 120 °.Profit
Behind centre drill section machining center hole, shallow bore hole is processed using the first drilling section, is finally directly processed using the second drilling section
Orifice chamfer, centre bore, drilling and chamfering is completed by a work step, it is to avoid multiple clamping workpiece, is reduced tool change time, is carried
High efficiency, it is ensured that crudy.
Wherein, the afterbody of chip removal straight trough 3 extends to handle of a knife 1, and the side of chip removal straight trough 3 on the face of handle of a knife 1 is straight flange, one
Side is arc-shaped edges, and the depth of the end of chip removal straight trough 3 to drill bit rear end is from shallow to deep.Adopt the structure more convenient chip removal.
In order to improve the bulk strength of cutter, the handle of a knife 1 and two ends drill bit are integral type structure.
In summary, the utility model has the advantages that simple in construction, the good, machining accuracy of rigidity is high, using provided with chip removal
The drill bit of straight trough carries out Drilling operation, and chip breaking is smooth and chip is tiny, is not easy to form built-up edge；Simultaneously using centre drill section and
Drilling section disposably completes the processing of centre bore, shallow bore hole and chamfering, reduces manufacturing procedure, improves processing efficiency；Chip removal is straight
Face of cylinder land and circular conical surface land at groove edge make drill bit have 2 contact surfaces with workpiece, make drill bit work in-process more steady
It is fixed, circularity and the higher hole of linearity can be processed, so as to improve machining accuracy.The utility model institute rapidoprint is especially
Metal suitable for producing the bits that are chopped, optimum efficiency can be obtained processing when these will not produce the material of long tendril chip,
These materials include cast iron, powder metallurgy（P/M）, in-high silicon content（6% or higher）Silico-aluminum etc..
Specific case used herein is set forth to principle of the present utility model and embodiment, above example
Explanation be only intended to help and understand method of the present utility model and its core concept.It should be pointed out that for the art
For those of ordinary skill, on the premise of the utility model principle is not departed from, some change can also be carried out to the utility model
Enter and modify, these are improved and modification is also fallen into the utility model scope of the claims.
Claims (9)
1. a kind of double end centre drill, it is characterised in that：Including cylinder handle of a knife（1）And it is arranged on handle of a knife（1）The drill bit at two ends, institute
Stating drill bit includes centre drill section（2）With drilling section, the drill bit is arranged with two chip removal straight troughs（3）, the chip removal straight trough（3）
Parallel to the central axis of drill bit, the centre drill section（2）Two main cutting edges are arranged with the conical surface of front end（4）, it is main to cut
Cut sword（4）The chip removal straight trough of end（3）Edge is provided with the face of cylinder land that width is b1（5）.
2. a kind of double end centre drill according to claim 1, it is characterised in that：The drilling section includes the first drilling section
（6）With the second drilling section（7）, the first drilling section（6）The conical surface on be arranged with two the first drilling swords, described second bores
Hole section（7）The conical surface on be arranged with two the second drilling swords, the chip removal of shown first drilling sword and the second drilling sword end is straight
Groove（3）Edge is equipped with circular conical surface land（8）.
3. a kind of double end centre drill according to claim 2, it is characterised in that：The main cutting edge（4）Cutting edge side arrive
The first inclined-plane land is provided between its relief angle α（9）, the cutting edge side of the first drilling sword is to oblique provided with second between its relief angle α '
Face land（10）, the cutting edge side of the second drilling sword is to being provided with the 3rd inclined-plane land between its relief angle α ' '（11）.
4. a kind of double end centre drill according to claim 3, it is characterised in that：The chip removal straight trough（3）Edge and cylinder
Face land（5）Between entity part be parallel to drill bit central axis transition circle cambered surface（12）, the transition circle cambered surface（12）
The diameter D1 of place cylinder is less than face of cylinder land（5）The diameter of place cylinder.
5. a kind of double end centre drill according to claim 4, it is characterised in that：The chip removal straight trough（3）Root circular arc mistake
Cross and knuckle radius R is 0.5mm, the chip removal straight trough（3）Angle Q be 90 °；Two chip removal straight troughs（3）The edge of respective side
It is parallel to each other and apart from for L.
6. a kind of double end centre drill according to claim 5, it is characterised in that：First inclined-plane land（9）Width
B2 is 0.4mm, first inclined-plane land（9）With main cutting edge（4）Place cutting plane B angles β is 8 °, the main cutting edge
（4）The relief angle α at place is 28 °；Second inclined-plane land（10）Width b3 be 0.6mm, second inclined-plane land（10）With
Cutting plane C angles β ' where first drilling sword is that the relief angle α ' at 8 °, the first drilling sword is 25 °；3rd inclined-plane
Land（11）Width b4 be 0.8mm, the 3rd inclined-plane land（11）With cutting plane E angles β ' ' where the second drilling sword
For 8 °, the relief angle α ' ' at the second drilling sword is 25 °；Two chip removal straight troughs（3）The Edge Distance L that respective side is parallel to each other
For 0.4mm.
7. a kind of double end centre drill according to claim 6, it is characterised in that：The first drilling section（6）Face angle
It is 60 ° to spend n, the second drilling section（7）Frustoconical bevel angle p be 90 °；The centre drill section（2）The frustoconical bevel angle γ of front end is
120°。
8. a kind of double end centre drill according to claim 1, it is characterised in that：The chip removal straight trough（3）Afterbody is extended to
Handle of a knife（1）, in handle of a knife（1）Chip removal straight trough on face（3）Side is that straight flange, side are arc-shaped edges, the chip removal straight trough（3）End
To drill bit rear end depth from shallow to deep.
9. a kind of double end centre drill according to claim 1, it is characterised in that：The handle of a knife（1）It is one with two ends drill bit
Body formula structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720146899.7U CN206492963U (en) | 2017-02-18 | 2017-02-18 | A kind of double end centre drill |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720146899.7U CN206492963U (en) | 2017-02-18 | 2017-02-18 | A kind of double end centre drill |
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| Publication Number | Publication Date |
|---|---|
| CN206492963U true CN206492963U (en) | 2017-09-15 |
Family
ID=59805234
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720146899.7U Active CN206492963U (en) | 2017-02-18 | 2017-02-18 | A kind of double end centre drill |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206492963U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112222488A (en) * | 2020-09-22 | 2021-01-15 | 华东理工大学 | Stepped drill bit capable of changing chip removal flow direction |
-
2017
- 2017-02-18 CN CN201720146899.7U patent/CN206492963U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112222488A (en) * | 2020-09-22 | 2021-01-15 | 华东理工大学 | Stepped drill bit capable of changing chip removal flow direction |
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