CN203253978U - Hard alloy twist drill - Google Patents
Hard alloy twist drill Download PDFInfo
- Publication number
- CN203253978U CN203253978U CN 201320197115 CN201320197115U CN203253978U CN 203253978 U CN203253978 U CN 203253978U CN 201320197115 CN201320197115 CN 201320197115 CN 201320197115 U CN201320197115 U CN 201320197115U CN 203253978 U CN203253978 U CN 203253978U
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- Prior art keywords
- hard alloy
- cone
- drilling face
- face
- main cone
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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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Abstract
The utility model discloses a hard alloy twist drill. A drill body of the hard alloy twist drill comprises a drill handle and a spiral blade tooth part arranged below the drill handle. A hard alloy head is welded on the lower end portion of the spiral blade tooth part. The hard alloy head is provided with a main cone-shaped drilling face and an auxiliary cone-shaped drilling face arranged above the main cone-shaped drilling face. The cone top angle of the main cone-shaped drilling face is A, the included angle between the auxiliary cone-shaped drilling face and the main cone-shaped drilling face is B, A is 125-135 degrees, and B is 160-170 degrees. The hard alloy head is designed to be of a double-cone-face structure, namely the whole hard alloy head comprises the main cone-shaped drilling face and the auxiliary cone-shaped drilling face, the hard alloy head of the double-cone-face structure can effectively lengthens the length of a cutting blade of the hard alloy head, and accordingly resistance borne in unit area of the cutting blade can be effectively lowered, and under the situation that borne resistance is reduced, the hard alloy twist drill can achieve easy drilling.
Description
Technical field
The utility model relates to the fluted drill technical field, relates in particular to a kind of hard alloy twist drill.
Background technology
As the important cutter of drilling, fluted drill is used general in the extreme in mechanical processing process; Utilizing during fluted drill carries out the process of Drilling operation, fluted drill mainly assigns to complete stock removal action by the tapered portion of its bottom.
The bottom of existing fluted drill generally only arranges a conical surface, and in actual drilling process, the blade and the contact area between workpiece that are arranged at this conical surface are larger, and the resistance that fluted drill bears is also larger, namely can not realize brisk drilling.
Summary of the invention
The purpose of this utility model is to provide a kind of hard alloy twist drill for the deficiencies in the prior art, and this hard alloy twist drill reduces by the mode that extends cutting edge the resistance that unit are is born, and then can realize brisk drilling.
For achieving the above object, the utility model is achieved through the following technical solutions.
A kind of hard alloy twist drill, include drill body, the helical edges tooth section that drill body includes drillstock and is positioned at the drillstock below, the bottom of the helical edges tooth section hard alloy head that has been welded, the secondary tapered bur bevel that hard alloy head is provided with main cone shape drilling face and is positioned at the top of main cone shape drilling face, the cone-apex angle of main cone shape drilling face is A, the angle of secondary tapered bur bevel and main cone shape drilling face is B, A is 125 °-135 °, and B is 160 °-170 °.
Wherein, the cone-apex angle A of described main cone shape drilling face is 130 °.
Wherein, the included angle B of described secondary tapered bur bevel and described main cone shape drilling face is 165 °.
The beneficial effects of the utility model are: a kind of hard alloy twist drill described in the utility model, the helical edges tooth section that its drill body includes drillstock and is positioned at the drillstock below, the bottom of the helical edges tooth section hard alloy head that has been welded, the secondary tapered bur bevel that hard alloy head is provided with main cone shape drilling face and is positioned at the top of main cone shape drilling face, the cone-apex angle of main cone shape drilling face is A, the angle of secondary tapered bur bevel and main cone shape drilling face is B, A is 125 °-135 °, and B is 160 °-170 °.Hard alloy head of the present utility model is designed to biconical surface structure, and namely whole hard alloy head includes main cone shape drilling face and secondary tapered bur bevel; The hard alloy head of above-mentioned biconical surface structure can extend the length of the cutting edge of carbide alloy head part effectively, and then can effectively reduce the resistance that the cutting edge unit are is born; In the situation that the resistance force diminishes of bearing, the utility model can be realized brisk drilling.
Description of drawings
The below utilizes accompanying drawing that the utility model is further detailed, but the embodiment in accompanying drawing does not consist of any restriction of the present utility model.
Fig. 1 is structural representation of the present utility model.
Include in Fig. 1:
1---drillstock 2---helical edges tooth section
3---main cone shape drilling face 4---secondary tapered bur bevel.
The specific embodiment
As shown in Figure 1, a kind of hard alloy twist drill, include drill body, the helical edges tooth section 2 that drill body includes drillstock 1 and is positioned at drillstock 1 below, the bottom of helical edges tooth section 2 hard alloy head that has been welded, the secondary tapered bur bevel 4 that hard alloy head is provided with main cone shape drilling face 3 and is positioned at the top of main cone shape drilling face 3, the cone-apex angle of main cone shape drilling face 3 is A, secondary tapered bur bevel 4 is B with the angle of main cone shape drilling face 3, and A is 125 °-135 °, and B is 160 °-170 °.
Wherein, the cone-apex angle A of main cone shape drilling face 3 is 130 °, and secondary tapered bur bevel 4 is 165 ° with the included angle B of main cone shape drilling face 3; Certainly, above-mentioned special angle value does not consist of restriction of the present utility model.
Hard alloy head of the present utility model is designed to biconical surface structure, and namely whole hard alloy head includes main cone shape drilling face 3 and secondary tapered bur bevel 4; The hard alloy head of above-mentioned biconical surface structure can extend the length of the cutting edge of carbide alloy head part effectively, and then can effectively reduce the resistance that the cutting edge unit are is born; In the situation that the resistance force diminishes of bearing, the utility model can be realized brisk drilling.
Comprehensive above-mentioned situation the utlity model has the advantage of drilling situation as can be known.
Above content is only preferred embodiment of the present utility model, for those of ordinary skill in the art, according to thought of the present utility model, all will change in specific embodiments and applications, this description should not be construed as restriction of the present utility model.
Claims (3)
1. hard alloy twist drill, include drill body, it is characterized in that: the helical edges tooth section (2) that drill body includes drillstock (1) and is positioned at drillstock (1) below, the bottom of helical edges tooth section (2) hard alloy head that has been welded, the secondary tapered bur bevel (4) that hard alloy head is provided with main cone shape drilling face (3) and is positioned at the top of main cone shape drilling face (3), the cone-apex angle of main cone shape drilling face (3) is A, secondary tapered bur bevel (4) is B with the angle of main cone shape drilling face (3), A is 125 °-135 °, and B is 160 °-170 °.
2. a kind of hard alloy twist drill according to claim 1, it is characterized in that: the cone-apex angle A of described main cone shape drilling face (3) is 130 °.
3. a kind of hard alloy twist drill according to claim 1 is characterized in that: described secondary tapered bur bevel (4) is 165 ° with the included angle B of described main cone shape drilling face (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320197115 CN203253978U (en) | 2013-04-18 | 2013-04-18 | Hard alloy twist drill |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320197115 CN203253978U (en) | 2013-04-18 | 2013-04-18 | Hard alloy twist drill |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203253978U true CN203253978U (en) | 2013-10-30 |
Family
ID=49466584
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320197115 Expired - Fee Related CN203253978U (en) | 2013-04-18 | 2013-04-18 | Hard alloy twist drill |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203253978U (en) |
-
2013
- 2013-04-18 CN CN 201320197115 patent/CN203253978U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20131030 Termination date: 20150418 |
|
| EXPY | Termination of patent right or utility model |