CN101733449A - Head-changeable drill - Google Patents
Head-changeable drill Download PDFInfo
- Publication number
- CN101733449A CN101733449A CN200910258036A CN200910258036A CN101733449A CN 101733449 A CN101733449 A CN 101733449A CN 200910258036 A CN200910258036 A CN 200910258036A CN 200910258036 A CN200910258036 A CN 200910258036A CN 101733449 A CN101733449 A CN 101733449A
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- apex point
- drilling rod
- hole
- strip locating
- head
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Abstract
The invention discloses a head-changeable drill which comprises a drill stem, a drill tip and stopper screws, wherein the center of the bottom surface of the drill tip is provided with a strip-shaped positioning lug boss which is arranged along the radial direction of the drill tip, two end faces of the strip-shaped positioning lug boss are respectively provided with a tapered hole, the center of the top surface of the drill stem is provided with a strip-shaped positioning hole which is arranged along the radial direction of the drill stem, two end faces of the strip-shaped positioning hole are respectively provided with a threaded hole corresponding to each tapered hole, the strip-shaped positioning lug boss is arranged in the strip-shaped positioning hole, and the stopper screws are arranged in the threaded holes and are connected with the tapered holes on the strip-shaped positioning lug boss. The head-changeable drill has the advantages of simple structure, convenient processing, accurate positioning, stability and reliability.
Description
Technical field
The present invention relates to the metal cutting tool, relate in particular to the brill tool.
Background technology
Drill bit commonly used at present adopts the form of one more, and promptly the bar portion of drill bit, cutting edge, chip pocket etc. are an integral body, all use identical material to make.After the cutting edge of drill bit partly damages, whole just sharpening or replacing again of drill bit.Therefore consider the cutting edge part is made into independent detachable unit form with drill bit shaft portion, i.e. alleged usually " interchangeable head " form of those of ordinary skills.This replaceable head divides after wearing and tearing and can change very easily, thereby make expensive cutter hub can use the longer time, and the replaceable head branch can be made by hard wear-resistant material, for example carbide alloy etc., and cutter hub can be made by having bigger flexible material, for example steel.
Chinese patent ZL200510004205.8 discloses a kind of rotatable tool that is used for smear metal processing, and its characteristics are: cutter is connected by drillstock and removable dismounting top, and it is big that moment of torsion is transmitted in this connection, and replaceable head divides loading and unloading convenient.But this cutter also comes with some shortcomings, and as drillstock and replaceable head branch junction one slit is arranged, and slit can distending during installation, can fatigue failure after repeatedly using, the chucking power of replaceable head is weakened poor stability; In addition, the bossing structure of interchangeable head is complicated, the manufacturing cost height.
German patent DE 3230688A1 has announced a kind of milling cutter with interchangeable head, the convex part that replaceable head divides is formed by cone pin, this cone pin can move into or leave the base that is similarly conical in shape, this base is at cutter hub front end place opening, the conical in shape of this pin and base means that the connection between the two must form special spin locking, this spin locking is more complicated aspect production, and make the axiality location between interchangeable branch and the cutter hub center line become more difficult, thereby influence machining accuracy.
Summary of the invention
The technical problem to be solved in the present invention is to overcome the deficiencies in the prior art, and a kind of simple in structure, easy to process, accurate positioning, reliable and stable head-changeable drill are provided.
For solving the problems of the technologies described above, the present invention by the following technical solutions:
A kind of head-changeable drill, comprise drilling rod, apex point and holding screw, be provided with strip locating convex block in central authorities on the bottom surface of described apex point along the apex point radial arrangement, respectively be provided with a bellmouth on the both ends of the surface of described strip locating convex block, be provided with strip locating hole in central authorities on the end face of described drilling rod along the drilling rod radial arrangement, respectively be provided with a screwed hole corresponding on the both ends of the surface of described strip locating hole with described bellmouth, described strip locating convex block places the strip locating hole, described holding screw is installed in the screwed hole, and is connected with bellmouth on the strip locating convex block.
The both ends of the surface of described strip locating hole are first arc surface coaxial with drilling rod, and the both ends of the surface of described strip locating convex block are second arc surface coaxial with apex point, and described first arc surface and second arc surface join.
Described first arc surface and second arc surface are the taper seat that cone angle equates, and taper angle theta is 4 °～9 °.
Described bellmouth and screwed hole arranged off-centre, eccentric throw D is 0.1mm～0.25mm.
Cold hole is communicated with the interior cold hole of the apex point on the apex point in the drilling rod on the described drilling rod.
Compared with prior art, the invention has the advantages that: the present invention does radial location by strip locating convex block on the apex point and the cooperation of the strip locating hole on the drilling rod and circumferentially locatees, by holding screw with apex point and drilling rod axial restraint, make the designs simplification of head-changeable drill, be convenient to processing, improved setting accuracy, the fatigue failure of having avoided the resilient clamp locate mode to cause simultaneously, make apex point reliable and stable, can transmit bigger moment of torsion with being connected of drilling rod.The both ends of the surface of strip locating hole are first arc surface coaxial with drilling rod, the both ends of the surface of strip locating convex block are second arc surface coaxial with apex point, utilize first arc surface and cooperating of second arc surface that apex point and drilling rod are done radial location, can guarantee the axiality of apex point and drilling rod, thereby improve the machining accuracy of drill bit.First arc surface and second arc surface are the taper seat that cone angle equates, make the easier for installation of apex point and drilling rod, more accurate positioning.Bellmouth and screwed hole arranged off-centre, thereby the applying precision of assurance strip locating convex block and strip locating hole.Cold hole is communicated with the interior cold hole of the apex point on the apex point in the drilling rod on the drilling rod, makes the apex point part more wear-resisting, and improve service life.Apex point of the present invention can adopt Hardmetal materials to make, and can improve drill bit hardness, reduces wear rate, and drilling rod can adopt other shock resistance better material to make, and has both improved rigidity, has saved production cost again; Can change the apex point of different sword types processes at the workpiece of unlike material; Apex point wearing and tearing back only needs to change apex point, does not need whole drill bit is unloaded from lathe, has reduced the error that the reorientation drill bit produces.
Description of drawings
Fig. 1 is a structural representation of the present invention;
Fig. 2 is a fractionation structural representation of the present invention;
Fig. 3 is the perspective view of apex point of the present invention;
Fig. 4 is the structure for amplifying schematic diagram of apex point of the present invention;
Fig. 5 is the vertical view of drilling rod of the present invention;
Fig. 6 is the partial sectional view of apex point of the present invention and drilling rod junction.
Each label is represented among the figure:
1, drilling rod 2, apex point
3, holding screw 11, strip locating hole
12, cold hole in screwed hole 13, the drilling rod
21, strip locating convex block 22, bellmouth
23, cold hole 111, first arc surface in the apex point
211, second arc surface
The specific embodiment
Extremely shown in Figure 6 as Fig. 1, a kind of head-changeable drill of the present invention, comprise drilling rod 1, apex point 2 and holding screw 3, drilling rod 1 is columniform elongate shaft portion, and has two chip pockets, with the discharge of control cutting, apex point 2 is rotational symmetric basic structure, also have two chip pockets, apex point 2 slightly larger in diameter are in the diameter of drilling rod 1, the smooth connection of chip pocket on the chip pocket on the apex point 2 and the drilling rod 1.Be provided with along the strip locating convex block 21 of apex point 2 radial arrangement in central authorities on the bottom surface of apex point 2, respectively be provided with a bellmouth 22 on the both ends of the surface of strip locating convex block 21, be provided with along the strip locating hole 11 of drilling rod 1 radial arrangement in central authorities on the end face of drilling rod 1, respectively be provided with a screwed hole 12 corresponding on the both ends of the surface of strip locating hole 11 with bellmouth 22, strip locating convex block 21 places strip locating hole 11, holding screw 3 is installed in the screwed hole 12, and is connected with bellmouth 22 on the strip locating convex block 21.Do radial location and circumferential location by strip locating convex block 21 on the apex point 2 and 11 cooperations of the strip locating hole on the drilling rod 1, by holding screw 3 with apex point 2 and drilling rod 1 axial restraint, make the designs simplification of head-changeable drill, be convenient to processing, improved setting accuracy, the fatigue failure of having avoided the resilient clamp locate mode to cause simultaneously makes apex point 2 reliable and stable with being connected of drilling rod 1, can transmit bigger moment of torsion.The both ends of the surface of strip locating hole 11 are first arc surface 111 coaxial with drilling rod 1, the both ends of the surface of strip locating convex block 21 are second arc surface 211 coaxial with apex point 2, first arc surface 111 and second arc surface 211 join, utilize first arc surface 111 and cooperating of second arc surface 211 that apex point 2 and drilling rod 1 are done radial location, can guarantee the axiality of apex point 2 and drilling rod 1, thereby improve the machining accuracy of drill bit.First arc surface 111 and second arc surface 211 are the taper seat that cone angle equates, and taper angle theta is 4 °～9 °, and in the present embodiment, taper angle theta is 6 °, make the easier for installation of apex point 2 and drilling rod 1, more accurate positioning.Bellmouth 22 and screwed hole 12 arranged off-centre, eccentric throw D is 0.1mm～0.25mm, and in the present embodiment, eccentric throw D is 0.15mm, can utilize holding screw 3 extruding bellmouth 22 downwards when tightening holding screw 3, thereby guarantee the applying precision of strip locating convex block 21 and strip locating hole 11.Cold hole 13 is communicated with the interior cold hole 23 of the apex point on the apex point 2 in the drilling rod on the drilling rod 1, makes apex point 2 parts more wear-resisting, and improve service life.After drilling rod 1 assembled with apex point 2, there was certain interval L in its strip locating convex block 21 with strip locating hole 11 bottom surfaces, and size is 0.5mm～1mm, and in the present embodiment, gap L is 1mm.Apex point 2 of the present invention can adopt Hardmetal materials to make, and can improve drill bit hardness, reduces wear rate, and drilling rod 1 can adopt other shock resistance better material to make, and has both improved rigidity, has saved production cost again; Can change the apex point 2 of different sword types processes at the workpiece of unlike material; Apex point 2 wearing and tearing backs only need to change apex point 2, do not need whole drill bit is unloaded from lathe, have reduced the error that the reorientation drill bit produces.
The foregoing description only is a preferred implementation of the present invention; should be pointed out that for the person of ordinary skill of the art, under the prerequisite that does not break away from principle of the present invention; can also make some equivalents, these equivalents all should be considered as protection scope of the present invention.
Claims (6)
1. head-changeable drill, comprise drilling rod (1), apex point (2) and holding screw (3), it is characterized in that: be provided with along the strip locating convex block (21) of apex point (2) radial arrangement in central authorities on the bottom surface of described apex point (2), respectively be provided with a bellmouth (22) on the both ends of the surface of described strip locating convex block (21), be provided with along the strip locating hole (11) of drilling rod (1) radial arrangement in central authorities on the end face of described drilling rod (1), respectively be provided with a screwed hole (12) corresponding on the both ends of the surface of described strip locating hole (11) with described bellmouth (22), described strip locating convex block (21) places strip locating hole (11), described holding screw (3) is installed in the screwed hole (12), and is connected with bellmouth (22) on the strip locating convex block (21).
2. head-changeable drill according to claim 1, it is characterized in that: the both ends of the surface of described strip locating hole (11) are first arc surface (111) coaxial with drilling rod (1), the both ends of the surface of described strip locating convex block (21) are second arc surface (211) coaxial with apex point (2), and described first arc surface (111) joins with second arc surface (211).
3. head-changeable drill according to claim 2 is characterized in that: the taper seat that described first arc surface (111) and second arc surface (211) equate for cone angle, and taper angle theta is 4 °～9 °.
4. according to each described head-changeable drill in the claim 1 to 3, it is characterized in that: described bellmouth (22) and screwed hole (12) arranged off-centre, eccentric throw D is 0.1mm～0.25mm.
5. according to each described head-changeable drill in the claim 1 to 3, it is characterized in that: cold hole (13) is communicated with the interior cold hole (23) of the apex point on the apex point (2) in the drilling rod on the described drilling rod (1).
6. head-changeable drill according to claim 4 is characterized in that: cold hole (13) is communicated with the interior cold hole (23) of the apex point on the apex point (2) in the drilling rod on the described drilling rod (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910258036A CN101733449A (en) | 2009-12-07 | 2009-12-07 | Head-changeable drill |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910258036A CN101733449A (en) | 2009-12-07 | 2009-12-07 | Head-changeable drill |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101733449A true CN101733449A (en) | 2010-06-16 |
Family
ID=42457765
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200910258036A Pending CN101733449A (en) | 2009-12-07 | 2009-12-07 | Head-changeable drill |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101733449A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104827090A (en) * | 2015-05-26 | 2015-08-12 | 苏州阿诺精密切削技术股份有限公司 | V-shaped positioning double-screw locking tooth crown blade |
| CN113664261A (en) * | 2021-09-02 | 2021-11-19 | 宁波阿卡龙切削工具有限公司 | Drilling rod convenient to replace and mount |
-
2009
- 2009-12-07 CN CN200910258036A patent/CN101733449A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104827090A (en) * | 2015-05-26 | 2015-08-12 | 苏州阿诺精密切削技术股份有限公司 | V-shaped positioning double-screw locking tooth crown blade |
| CN113664261A (en) * | 2021-09-02 | 2021-11-19 | 宁波阿卡龙切削工具有限公司 | Drilling rod convenient to replace and mount |
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| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Open date: 20100616 |