CN208825635U - Double-pole slot step ultrahigh hardness drill bit - Google Patents
Double-pole slot step ultrahigh hardness drill bit Download PDFInfo
- Publication number
- CN208825635U CN208825635U CN201821654218.9U CN201821654218U CN208825635U CN 208825635 U CN208825635 U CN 208825635U CN 201821654218 U CN201821654218 U CN 201821654218U CN 208825635 U CN208825635 U CN 208825635U
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- China
- Prior art keywords
- bore portion
- blade
- cutter groove
- drill bit
- double
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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- 230000007704 transition Effects 0.000 claims description 2
- 238000005553 drilling Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 238000007781 pre-processing Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000008685 targeting Effects 0.000 description 1
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- Drilling Tools (AREA)
- Processing Of Stones Or Stones Resemblance Materials (AREA)
Abstract
The utility model provides a kind of double-pole slot step ultrahigh hardness drill bit, including the first bore portion, second bore portion and shank section, first bore portion is connect with the second bore portion, second bore portion is connect with shank section, the diameter of first bore portion is smaller than the diameter of the second bore portion, the outside of first bore portion and the second bore portion is equipped with spiral first cutter groove, so that the first bore portion forms the first blade and the second bore portion forms the second blade, the outside of second bore portion is equipped with spiral second cutter groove being spaced apart with the first cutter groove, second cutter groove for changing the second blade anterior angle, so that the anterior angle of the first blade is equal with the anterior angle of the second blade.The utility model opens up spiral second cutter groove being spaced apart with the first cutter groove on the outside of the second bore portion, the anterior angle of second blade is passivated, so that the anterior angle of the first blade and the anterior angle of the second blade are consistent, and the rigidity of the second blade is improved, the risk that tipping occurs for cutter is lowered.
Description
Technical field
The utility model relates to field of drill more particularly to a kind of double-pole slot step ultrahigh hardness drill bits.
Background technique
As shown in Fig. 3,201 diameter of front end of the bore portion of existing boring Step drill 200 is than 202 diameter of rear end
Small, when carrying out drilling processing to part, the front end 201 of bore portion first carries out preprocessing to part, and the front end 201 of bore portion adds
The bore dia that work comes out is smaller than targeting orifice diameter, then is further added to the hole of preprocessing by the rear end 202 of bore portion
Work forms target hole with processing.Since existing boring Step drill 200 only opens up a helicla flute 203, before bore portion
The anterior angle for the preceding terminal knife edge 201a that end 201 is formed is smaller than the anterior angle for the rear terminal knife edge 202a that the rear end 202 of bore portion is formed, thus
The preceding terminal knife edge 201a of bore portion is more blunt, and the rear terminal knife edge 202a of bore portion is more sharp, causes to bore in Step drill
The cutting force of the preceding terminal knife edge 201a and rear terminal knife edge 202a of bore portion are inconsistent when hole 200, so that the rear terminal knife edge of bore portion
202a is easy tipping.
Utility model content
The purpose of this utility model is to provide a kind of consistent drillings of anterior angle that can guarantee preceding terminal knife edge Yu rear terminal knife edge
Cutting-tool's used life is improved to lower the risk that tipping occurs for cutter with Step drill.
To achieve the above object, the utility model provides a kind of double-pole slot step ultrahigh hardness drill bit, including first
Bore portion, the second bore portion and shank section, first bore portion are connect with second bore portion, second bore portion with
Shank section connection, the diameter of first bore portion is smaller than the diameter of the second bore portion, first bore portion and described
The outside of second bore portion is equipped with spiral first cutter groove, so that first bore portion forms the first blade and second and bores
Hole portion forms the second blade, and the outside of second bore portion is equipped be spaced apart with first cutter groove spiral second
Cutter groove, second cutter groove for changing second blade anterior angle so that the anterior angle of first blade and described second
The anterior angle of blade is equal.
Preferably, being equipped with transition face between first bore portion and second bore portion.
Preferably, the shank section is in staight shank shape.
Preferably, the apex angle size of the end of first bore portion is in the range of 128 ° -138 °.
Preferably, the helical angle size of first cutter groove is in the range of 18 ° -30 °.
Compared with prior art, since the double-pole slot step ultrahigh hardness drill bit of the utility model is in first drilling
Portion and the outside of second bore portion are equipped with spiral first cutter groove, thus the first bore portion formed the first blade and
Form the second blade in the second bore portion, then open up on the outside of the second bore portion be spaced apart with the first cutter groove it is spiral
Second cutter groove is changed the anterior angle of the second blade by second cutter groove, the anterior angle of the second blade is passivated, so that the first knife
The anterior angle of sword and the anterior angle of the second blade are consistent, and improve the rigidity of the second blade, so that the first blade and the
Two blades stress when carrying out hole machined is consistent, lowers the risk that tipping occurs for cutter, improves cutting-tool's used life.
Detailed description of the invention
Fig. 1 is the double-pole slot step ultrahigh hardness drill bit structure schematic diagram of the utility model.
Fig. 2 be in Fig. 1 anterior angle schematic diagram and second blade of first blade at the section of A-A at the section of B-B
Anterior angle schematic diagram.
Fig. 3 is the structural schematic diagram of existing boring Step drill.
Specific embodiment
In order to which the technology contents, construction feature of the utility model is described in detail, below in conjunction with embodiment and cooperate attached drawing
It is described further.
Fig. 1 and Fig. 2 is please referred to, the double-pole slot step ultrahigh hardness drill bit 100 of the utility model includes the first bore portion
1, the second bore portion 2 and shank section 3, the first bore portion 1 are connect with the second bore portion 2, and the second bore portion 2 is connect with shank section 3,
Specifically, shank section 3 is in staight shank shape；The diameter of first bore portion 1 is smaller than the diameter of the second bore portion 2, the first bore portion 1 and
The outside of two bore portions 2 is equipped with spiral first cutter groove 4, so that the first bore portion 1 forms the first blade 11 and second and bores
Hole portion 2 forms the second blade 21, and the outside of the second bore portion 2 is equipped with spiral second knife being spaced apart with the first cutter groove 4
Slot 5, the second cutter groove 5 for changing the second blade 21 anterior angle so that the anterior angle of the anterior angle of the first blade 11 and the second blade 21
It is equal, the rigidity of the second blade 21 is improved, so that the first blade 11 and the second blade 21 stress one when carrying out hole machined
It causes, lowers the risk that tipping occurs for cutter, improve cutting-tool's used life.Specifically, in the double-pole slot step of the utility model
It is the since the diameter of the first bore portion 1 is smaller than the diameter of the second bore portion 2 when formula ultrahigh hardness drill bit 100 carries out hole machined
Second blade 21 of two bore portions 2 can be processed to steady and smooth, and be equipped between the first bore portion 1 and the second bore portion 2
Face 6 is crossed, the risk that tipping occurs when cutter is processed from the first blade 11 processing the second blade of knife 21 is further lowered.
Referring to Fig. 1, the apex angle of drill bit be determine chip removal angle, cutting force, the generation of burr, hole inner wall roughness weight
Factor is wanted, to influence the processing quality of the cutting ability of drill bit, service life and drilling processing metapore.Therefore, in actual processing,
The selection of drill head apical angle has important meaning to the processing quality, raising bit life and the production efficiency of drilling processing that guarantee hole
Justice.Therefore the service life to guarantee double-pole slot step ultrahigh hardness drill bit 100, in the present embodiment, the end of the first bore portion 1
The 2 Φ size of apex angle in portion is in the range of 128 ° -138 °.The cutter groove surface of drill bit and the intersection of outer cylinder surface are spiral
The fixture of line, the helix and drill axis is the helical angle of drill bit, and helical angle is bigger, and anterior angle is bigger, and the blade of drill bit gets over cutting edge of a knife or a sword
Benefit.But helical angle is excessive, can make strength reduction at drill bit cutting edge, and radiating condition is deteriorated, therefore in the present embodiment, to guarantee first
The intensity of blade 11 avoids the first blade 11 excessively sharp and leads to that tipping occurs in processing, and the helical angle of the first cutter groove 4 is big
It is small to be in the range of 18 ° -30 °.
To sum up, it is bored due to the double-pole slot step ultrahigh hardness drill bit 100 of the utility model in the first bore portion 1 and second
The outside of hole portion 2 is equipped with spiral first cutter groove 4, to form the first blade 11 in the first bore portion 1 and bore second
Hole portion 2 forms the second blade 21, then opens up spiral the be spaced apart with the first cutter groove 4 in the outside of the second bore portion 2
Two cutter grooves 5 are changed the anterior angle of the second blade 21 by second cutter groove 5, the anterior angle of the second blade 21 are passivated, so that the
The anterior angle of one blade 11 and the anterior angle of the second blade 21 are consistent, and improve the rigidity of the second blade 21, so that the
The stress when carrying out hole machined is consistent with the second blade 21 for one blade 11, lowers the risk that tipping occurs for cutter, improves cutter
Service life.
Above disclosed is only the preferred embodiments of the utility model, and the power of the utility model cannot be limited with this
Sharp range, therefore equivalent variations made according to the claim of the utility model belong to the range that the utility model is covered.
Claims (5)
1. a kind of double-pole slot step ultrahigh hardness drill bit, which is characterized in that including the first bore portion, the second bore portion and knife handle
Portion, first bore portion are connect with second bore portion, and second bore portion is connect with the shank section, and described first
The diameter of bore portion is smaller than the diameter of the second bore portion, and it is in spiral shell that the outside of first bore portion and second bore portion, which is equipped with,
The first cutter groove of shape is revolved, so that first bore portion forms the first blade and the second bore portion and forms the second blade, described the
The outside of two bore portions is equipped with spiral second cutter groove being spaced apart with first cutter groove, and second cutter groove is for changing
Become the anterior angle of second blade, so that the anterior angle of first blade is equal with the anterior angle of second blade.
2. double-pole slot step ultrahigh hardness drill bit according to claim 1, which is characterized in that first bore portion with
Transition face is equipped between second bore portion.
3. double-pole slot step ultrahigh hardness drill bit according to claim 1, which is characterized in that the shank section is in staight shank
Shape.
4. double-pole slot step ultrahigh hardness drill bit according to claim 1, which is characterized in that first bore portion
The apex angle size of end is in the range of 128 ° -138 °.
5. double-pole slot step ultrahigh hardness drill bit according to claim 1, which is characterized in that the spiral shell of first cutter groove
Swing angle size is in the range of 18 ° -30 °.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821654218.9U CN208825635U (en) | 2018-10-11 | 2018-10-11 | Double-pole slot step ultrahigh hardness drill bit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821654218.9U CN208825635U (en) | 2018-10-11 | 2018-10-11 | Double-pole slot step ultrahigh hardness drill bit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208825635U true CN208825635U (en) | 2019-05-07 |
Family
ID=66318871
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821654218.9U Expired - Fee Related CN208825635U (en) | 2018-10-11 | 2018-10-11 | Double-pole slot step ultrahigh hardness drill bit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208825635U (en) |
-
2018
- 2018-10-11 CN CN201821654218.9U patent/CN208825635U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20190507 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |