CN201783682U - Drill bit for drilling large length-diameter ratio deep holes - Google Patents
Drill bit for drilling large length-diameter ratio deep holes Download PDFInfo
- Publication number
- CN201783682U CN201783682U CN2010205113681U CN201020511368U CN201783682U CN 201783682 U CN201783682 U CN 201783682U CN 2010205113681 U CN2010205113681 U CN 2010205113681U CN 201020511368 U CN201020511368 U CN 201020511368U CN 201783682 U CN201783682 U CN 201783682U
- Authority
- CN
- China
- Prior art keywords
- edge
- cutting edge
- drill bit
- arc
- big
- Prior art date
- 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 - Lifetime
Links
Images
Landscapes
- Drilling Tools (AREA)
Abstract
The utility model discloses a drill bit for drilling large length-diameter ratio deep holes, which comprises a bit body. The bit body includes a tip portion, a chip removing portion and a shank. The chip removing portion is provided with a flute extending from the tip portion to the shank and an auxiliary cutting edge, and the tip portion is provided with a front tool face, a rear clearance face and a chisel edge. The front tool face and the rear clearance face cross to form a main cutting edge, the main cutting edge is composed of a linear inner edge and a curved outer edge connected with each other, the linear inner edge is connected with the chisel edge, and the curved outer edge includes an arc cutting edge, a linear cutting edge and an arc transitional edge sequentially connected from outside to inside. The arc cutting edge and the arc transitional edge project towards inside of the flute, the arc cutting edge is connected with the auxiliary cutting edge, and the arc transitional edge is connected with the linear inner edge. The drill bit has the advantages of simple structure, fine durability, high chip breaking and discharging capacity, and high cutting efficiency.
Description
Technical field
The utility model relates to the metal cutting process technology, relates in particular to the drill bit that is used for the big L/D ratio deep hole machining.
Background technology
The tool category that is used for deep hole machining is a lot, at present commonly used have speciality fluted drill, drill gun, BTA drill bit and a self-contained jet drilling etc., they have certain shortcoming in making and using, as speciality fluted drill chip removal difficulty, need frequently to griffe chip removal just in drilling process, creep into 2～3 times of apertures after dark, cutting edge lubricated poor with cooling condition, the cutting temperature height, drilling life of bit is low, and the drill bit poor rigidity causes self-excited vibration easily.Drill gun, BTA depth drill and self-contained jet drilling need carbide alloy as blade on making, and blade and cutter hub welding be difficulty, and need a cover dedicated hydraulic to seal the voltage supply system when using, and cost of manufacture is too high.
Notification number is that the patent documentation of CN2036077U discloses a kind of depth twist drill, the spiral flute type of this drill bit is formed by parabolic type and the rotation of circular arc line style, no land, and chip pocket is wide, employing is than the thick brill core of large helix angle and zero draft, and apex point adopts the correction of cross reconditioning method.Do not need special lathe and frock during use, can use on common bench drill, vertical drill, lathe, boring machine, the smear metal of formation is the ribbon shape.But this deep hole drill is when work, and darker because of machining hole, machining status is abominable, if drill bit does not have land, will there be the bad problem of guidance quality in cutter, is easy to during the cutter drilling bore partially, and, this kind spiral flute type has determined cutter when cutting ductility preferred metal material, the ribbon smear metal will and be difficult to fracture than length, makes chip area be stopped up by smear metal easily, and cutting fluid is difficult to flow into, thereby have influence on the cooling of cutting place, can reduce the service life of drilling efficiency and drill bit.
Notification number is that the patent documentation of CN2806004Y discloses a kind of spiral bit, it comprises cutter hub, cutter head, on the described cutter hub spiral goove is arranged, end in described spiral goove, the cutting tip of described cutter head comprises the cutting edge of two symmetries, the front cutting edge of two symmetries, and the cutting edge of described two symmetries connects by boring core, the centre of two cutting edges that are connected becomes S shape, both sides to be respectively linear, and the cutting edge of described cutting edge is the chamfered edge sword.Though this utility model drill bit centering property is good than unit-type drill head, its apex point is not easy to reconditioning, and manufacture difficulty is big, cost of manufacture is high.
The utility model content
The technical problems to be solved in the utility model is to overcome the deficiencies in the prior art, and a kind of simple in structure, durability good, chip breaking chip removal ability is strong, stock-removing efficiency is high drill bit that is used for the big L/D ratio deep hole machining is provided.
For solving the problems of the technologies described above, the utility model by the following technical solutions:
A kind of drill bit that is used for the big L/D ratio deep hole machining, comprise drill body, described drill body comprises apex point portion, chip removal portion and shank, described chip removal portion is provided with chip area and the front cutting edge that extends to shank from apex point portion, described apex point portion is provided with rake face, flank and chisel edge, described rake face and flank intersect the formation main cutting edge, described main cutting edge is formed by connecting by straight line inner edge and curve outside, the straight line inner edge is connected with chisel edge, described curve outside comprises the arc edge that connects successively from outside to inside, linear cutting edge and arc transition sword, described arc edge and described arc transition sword are towards the chip area internal projection, described arc edge is connected with front cutting edge, and described arc transition sword is connected with the straight line inner edge.
The anterior angle of described straight line inner edge and arc transition sword is zero or negative value, and the radial rake of described arc edge is a negative value, the anterior angle of described linear cutting edge be on the occasion of.
Described straight line inner edge and linear cutting edge are all tangent with the arc transition sword, and the angle theta of described straight line inner edge and linear cutting edge is 18 °～38 °, and the radius r of described arc transition sword is 0.5mm～3.5mm.
Described main cutting edge is provided with two, article two, the main cutting edge layout that is centrosymmetric, article two, the linear cutting edge in the main cutting edge is parallel to each other, and between two linear cutting edges is 0.55～0.75 times of core thickness of drilling bit value K apart from S, and described core thickness of drilling bit value K is 0.2～0.4 times of the diameter D of apex point portion.
The chord length L of described arc edge is 0.08～0.28 times of apex point portion radius R.
The first flank that described flank is increased successively by angle, second flank and the 3rd back are formed.
Compared with prior art, advantage of the present utility model is:
The drill bit that is used for the big L/D ratio deep hole machining of the present utility model, its curve outside comprises arc edge, linear cutting edge and the arc transition sword that connects successively from outside to inside, arc edge and arc transition sword are towards the chip area internal projection, improved point of a knife intensity, and strengthened radiating effect, the high stress concentrations point appears on the curve in projection when guaranteeing that cutter well can be avoided cutting in centering property, reduce the particularly load on the curve outside unit length of main cutting edge, tool life and cutting ability are improved.The radial rake of arc edge is a negative value, at arc edge place chip curling and flows to hole wall; The linear interpolation angle of cutting edge be on the occasion of, at linear cutting edge place chip curling and to flow in the chip area; Angle of cutting edge is changed to zero or negative value again in from the arc transition sword to straight line, smear metal will curled and flowed to the direction of feed of cutter, the flow direction of smear metal from the whole main cutting edge, stressed and the two ends (arc edge place and straight line inner edge place) at (linear cutting edge place) is subjected to force direction opposite in the middle part of the smear metal, make arc transition sword place become the boundary of smear metal opposite course, smear metal is reversed to fracture at this and is formed the smear metal unit, the existence of this arc transition sword had both strengthened intensity herein, solved the drawback that is difficult for chip breaking herein again, make the smear metal unit form the coniform of similar tadpole, the class circular cone tadpole type that is shaped as of smear metal, the wealthy mouthful of end in smear metal unit has the type of turning up edge, the slot end is the chip breaking part, smear metal has elongated tail type extension after the slot end, the structure of this smear metal unit is a smear metal structure ideal in the present big L/D ratio deep hole machining, it is very easily discharged, can in the hole, not form obstruction, do not need to griffe chip removal, improved the operating efficiency of big L/D ratio deep hole machining greatly, feed draw ratio of drill bit that is used for the big L/D ratio deep hole machining of the present utility model can be reached more than 15.Two distances between the linear cutting edge that is parallel to each other rationally are set, can when gun drilling, reduce the cutting force and the moment of torsion of drill bit, reduce the probability that drill bit fractures.Arc edge must be arranged in certain scope, if should projection arc edge width excessive, then make the chip-flowing hole wall, and scratches hole wall probably, has reduced the surface quality in hole; If this projection arc edge is too small, does not then realize the purpose of raising cutter intensity and radiating effect, when the chord length L that experimental results show that arc edge is 0.08～0.28 times of apex point portion radius R, have best resultant effect.The drill bit of big L/D ratio deep hole machining that is used for of the present utility model is based on above-mentioned each architectural feature, make smear metal more even along the thickness distribution of main cutting edge, chip breaking is effective, chip deformation is little, making smear metal can waltz through chip area discharges, therefore, the utility model is specially adapted to the drilling of steel class, stainless steel-like, cast iron class and the aluminium alloy class material of hardness below 48HRC.
Description of drawings
Fig. 1 is a main TV structure schematic diagram of the present utility model;
Fig. 2 be apex point of the present utility model portion look closely the structure for amplifying schematic diagram;
Fig. 3 is the structure for amplifying schematic diagram of main cutting edge part among Fig. 2;
Fig. 4 is the perspective view of apex point portion in the utility model;
Fig. 5 is the radial rake schematic diagram of arc edge in the utility model;
Fig. 6 is the anterior angle schematic diagram of the utility model cathetus cutting edge;
Fig. 7 is the anterior angle schematic diagram of arc transition sword in the utility model;
Fig. 8 is the anterior angle schematic diagram of the utility model cathetus inner edge.
Each label is represented among the figure:
1, drill body; 2, apex point portion; 3, chip removal portion; 4, shank; 5, main cutting edge; 31, chip area; 32, front cutting edge; 21, rake face; 22, flank; 23, chisel edge; 51, straight line inner edge; 52, curve outside; 221, first flank; 222, second flank; 223, the 3rd back; 521, arc transition sword; 522, linear cutting edge; 523, arc edge.
The specific embodiment
Fig. 1 to Fig. 8 shows a kind of drill bit embodiment that is used for the big L/D ratio deep hole machining of the present utility model, this drill bit comprises drill body 1, drill body 1 comprises apex point portion 2, chip removal portion 3 and shank 4, chip removal portion 3 is provided with chip area 31 and the front cutting edge 32 that extends to shank 4 from apex point portion 2, apex point portion 2 is provided with rake face 21, flank 22 and chisel edge 23, the first flank 221 that flank 22 is increased successively by angle, second flank 222 and the 3rd back 223 are formed, rake face 21 intersects formation main cutting edge 5 with first flank 221, main cutting edge 5 is formed by connecting by straight line inner edge 51 and curve outside 52, straight line inner edge 51 is connected with chisel edge 23, curve outside 52 comprises the arc edge 523 that connects successively from outside to inside, linear cutting edge 522 and arc transition sword 521, arc edge 523 and arc transition sword 521 are towards chip area 31 internal projection, arc edge 523 is connected with front cutting edge 32, arc transition sword 521 is connected with straight line inner edge 51, this tooth shape has improved point of a knife intensity, and strengthened radiating effect, the high stress concentrations point appears on the curve in projection when guaranteeing that cutter well can be avoided cutting in centering property, reduce the particularly load on curve outside 52 unit lengths of main cutting edge 5, tool life and cutting ability are improved.The drill bit of big L/D ratio deep hole machining that is used for of the present utility model is based on above-mentioned each architectural feature, make smear metal more even along the thickness distribution of main cutting edge 5, chip breaking is effective, chip deformation is little, making smear metal can waltz through chip area 31 discharges, therefore, the utility model is specially adapted to the drilling of steel class, stainless steel-like, cast iron class and the aluminium alloy class material of hardness below 48HRC.
In the present embodiment, the radial rake of arc edge 523 is α, the anterior angle of arc transition sword 521 is β, the anterior angle of linear cutting edge 522 is γ, and the anterior angle of straight line inner edge 51 is δ, and the anterior angle of its cathetus inner edge 51 and arc transition sword 521 is zero or negative value, the radial rake of arc edge 523 is a negative value, the anterior angle of linear cutting edge 522 be on the occasion of because the radial rake of arc edge 523 is a negative value, at arc edge 523 place's chip curlings and flow to hole wall; Since linear cutting edge 522 anterior angles be on the occasion of, at linear cutting edge 522 place's chip curlings and to flow in the chip area 31; Be changed to zero or negative value again from arc transition sword 521 to straight line inner edge 51 anterior angles, smear metal will curled and flowed to the direction of feed of cutter, the flow direction of smear metal from the whole main cutting edge 5, stressed and the two ends (arc edge 523 places and straight line inner edge 51 places) at (linear cutting edge 522 places) is subjected to force direction opposite in the middle part of the smear metal, make arc transition sword 521 places become the boundary of smear metal opposite course, smear metal is reversed to fracture at this and is formed the smear metal unit, the existence of this arc transition sword 521 had both strengthened intensity herein, solved the drawback that is difficult for chip breaking herein again, make the smear metal unit form the coniform of similar tadpole, the class circular cone tadpole type that is shaped as of smear metal, the wealthy mouthful of end in smear metal unit has the type of turning up edge, the slot end is the chip breaking part, smear metal has elongated tail type extension after the slot end, the structure of this smear metal unit is a smear metal structure ideal in the present big L/D ratio deep hole machining, it is very easily discharged, can in the hole, not form obstruction, do not need to griffe chip removal, improved the operating efficiency of big L/D ratio deep hole machining greatly.In the present embodiment, straight line inner edge 51 and linear cutting edge 522 are all tangent with arc transition sword 521, and straight line inner edge 51 is 18 °～38 ° with the angle theta of linear cutting edge 522, and the radius r of arc transition sword 521 is 0.5mm～3.5mm.Cutting edge 5 is provided with two, article two, cutting edge 5 layout that is centrosymmetric, article two, the linear cutting edge 522 in the cutting edge 5 is parallel to each other, and between two linear cutting edges 522 is 0.55～0.75 times of core thickness of drilling bit value K apart from S, and core thickness of drilling bit value K is 0.2～0.4 times of the 2 diameter D of apex point portion.Two distances between the linear cutting edge that is parallel to each other 522 rationally are set, can when gun drilling, reduce the cutting force and the moment of torsion of drill bit, reduce the probability that drill bit fractures.Arc edge 523 must be arranged in certain scope, if should projection arc edge 523 width excessive, then make the chip-flowing hole wall, and scratches hole wall probably, reduces the surface quality in hole; If this projection arc edge 523 is too small, it is not obvious then to improve cutter intensity and radiating effect, when the chord length L that experimental results show that arc edge 523 is 0.08～0.28 times of apex point portion radius R, has best resultant effect.
Above-mentioned is preferred embodiment of the present utility model, is not the utility model is done any pro forma restriction.Though the utility model discloses as above with preferred embodiment, yet be not in order to limit the utility model.Any those of ordinary skill in the art, under the situation that does not break away from the technical solutions of the utility model scope, all can utilize the technology contents of above-mentioned announcement that technical solutions of the utility model are made many possible changes and modification, or be revised as the equivalent embodiment of equivalent variations.Therefore, every content that does not break away from technical solutions of the utility model, all should drop in the scope of technical solutions of the utility model protection any simple modification, equivalent variations and modification that above embodiment did according to the utility model technical spirit.
Claims (9)
1. drill bit that is used for the big L/D ratio deep hole machining, comprise drill body (1), described drill body (1) comprises apex point portion (2), chip removal portion (3) and shank (4), described chip removal portion (3) is provided with chip area (31) and the front cutting edge (32) that extends to shank (4) from apex point portion (2), described apex point portion (2) is provided with rake face (21), flank (22) and chisel edge (23), described rake face (21) intersects formation main cutting edge (5) with flank (22), described main cutting edge (5) is formed by connecting by straight line inner edge (51) and curve outside (52), straight line inner edge (51) is connected with described chisel edge (23), it is characterized in that: described curve outside (52) comprises the arc edge (523) that connects successively from outside to inside, linear cutting edge (522) and arc transition sword (521), described arc edge (523) and described arc transition sword (521) are all towards chip area (31) internal projection, described arc edge (523) is connected with front cutting edge (32), and described arc transition sword (521) is connected with straight line inner edge (51).
2. the drill bit that is used for the big L/D ratio deep hole machining according to claim 1, it is characterized in that: the anterior angle of described straight line inner edge (51) and arc transition sword (521) is zero or negative value, the radial rake of described arc edge (523) is a negative value, the anterior angle of described linear cutting edge (522) be on the occasion of.
3. the drill bit that is used for the big L/D ratio deep hole machining according to claim 1 and 2, it is characterized in that: described straight line inner edge (51) and linear cutting edge (522) are all tangent with arc transition sword (521), described straight line inner edge (51) is 18 °～38 ° with the angle theta of linear cutting edge (522), and the radius r of described arc transition sword (521) is 0.5mm～3.5mm.
4. the drill bit that is used for the big L/D ratio deep hole machining according to claim 1 and 2, it is characterized in that: described main cutting edge (5) is provided with two, article two, main cutting edge (5) layout that is centrosymmetric, article two, the linear cutting edge (522) in the main cutting edge (5) is parallel to each other, article two, between the linear cutting edge (522) be 0.55～0.75 times of core thickness of drilling bit value K apart from S, described core thickness of drilling bit value K is 0.2～0.4 times of the diameter D of apex point portion (2).
5. the drill bit that is used for the big L/D ratio deep hole machining according to claim 3, it is characterized in that: described main cutting edge (5) is provided with two, article two, main cutting edge (5) layout that is centrosymmetric, article two, the linear cutting edge (522) in the main cutting edge (5) is parallel to each other, article two, between the linear cutting edge (522) be 0.55～0.75 times of core thickness of drilling bit value K apart from S, described core thickness of drilling bit value K is 0.2～0.4 times of the diameter D of apex point portion (2).
6. the drill bit that is used for the big L/D ratio deep hole machining according to claim 1 and 2 is characterized in that: the chord length L of described arc edge (523) is 0.08～0.28 times of apex point portion (2) radius R.
7. the drill bit that is used for the big L/D ratio deep hole machining according to claim 5 is characterized in that: the chord length L of described arc edge (523) is 0.08～0.28 times of apex point portion (2) radius R.
8. the drill bit that is used for the big L/D ratio deep hole machining according to claim 1 and 2 is characterized in that: the first flank (221) that described flank (22) is increased successively by angle, second flank (222) and the 3rd back (223) are formed.
9. the drill bit that is used for the big L/D ratio deep hole machining according to claim 7 is characterized in that: the first flank (221) that described flank (22) is increased successively by angle, second flank (222) and the 3rd back (223) are formed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205113681U CN201783682U (en) | 2010-08-31 | 2010-08-31 | Drill bit for drilling large length-diameter ratio deep holes |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205113681U CN201783682U (en) | 2010-08-31 | 2010-08-31 | Drill bit for drilling large length-diameter ratio deep holes |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201783682U true CN201783682U (en) | 2011-04-06 |
Family
ID=43815660
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010205113681U Expired - Lifetime CN201783682U (en) | 2010-08-31 | 2010-08-31 | Drill bit for drilling large length-diameter ratio deep holes |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201783682U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101912987A (en) * | 2010-08-31 | 2010-12-15 | 株洲钻石切削刀具股份有限公司 | Drill bit for processing deep hole with large length-diameter ratio |
| CN102794485A (en) * | 2012-08-24 | 2012-11-28 | 深圳市金洲精工科技股份有限公司 | Flat head drill and processing method thereof |
-
2010
- 2010-08-31 CN CN2010205113681U patent/CN201783682U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101912987A (en) * | 2010-08-31 | 2010-12-15 | 株洲钻石切削刀具股份有限公司 | Drill bit for processing deep hole with large length-diameter ratio |
| CN102794485A (en) * | 2012-08-24 | 2012-11-28 | 深圳市金洲精工科技股份有限公司 | Flat head drill and processing method thereof |
| CN102794485B (en) * | 2012-08-24 | 2014-08-27 | 深圳市金洲精工科技股份有限公司 | Flat head drill and processing method thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101912987B (en) | Drill bit for processing deep hole with large length-diameter ratio | |
| EP2027957B1 (en) | A strong high performance twist drill | |
| EP1925386B1 (en) | Drill bit with high performance for chip removal | |
| JP2013166201A (en) | End mill with coolant hole | |
| CN201151004Y (en) | Step drill with changeable head | |
| CN217492832U (en) | Taper ball head rough milling cutter for aluminum alloy impeller | |
| CN113523366B (en) | Small deep hole drilling tool without cross-edge radial broken line edge | |
| CN201783682U (en) | Drill bit for drilling large length-diameter ratio deep holes | |
| CN201500802U (en) | Whole bit for high-strength short chip-cutting material processing | |
| CN104999101A (en) | Multipurpose processing turning tool sheet for motorcycle transmission gear | |
| CN204975452U (en) | Optimize spot facing work drill bit of chip groove | |
| CN203711944U (en) | Durable drill | |
| CN204770746U (en) | Multipurpose motorcycle drive gear processing vehicle blade | |
| CN212094499U (en) | Chip breaking drill for front cutter face | |
| CN104338976A (en) | Durable drill | |
| CN204770958U (en) | Tapering reamer | |
| CN218503422U (en) | Welding alloy inner-cooling forming stepped drill | |
| CN209850010U (en) | Reamer for processing small hole of oil pump body | |
| CN207464335U (en) | Hard alloy Double-head rotation filing | |
| CN205270958U (en) | Superhard composite drill bit and blade, drilling rod thereof | |
| CN210059914U (en) | Drilling bit for automobile leaf spring | |
| CN101670459A (en) | Twist drill with small helix angle | |
| CN206263306U (en) | It is a kind of to improve the apex point that alloy bores chip-breaking performance | |
| CN212976854U (en) | Cylinder sleeve processing drill bit | |
| CN205464484U (en) | High speed steel twist drill that uses on lathe |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20110406 Effective date of abandoning: 20120118 |