CN220050159U - Multistage step deep hole drill bit - Google Patents
Multistage step deep hole drill bit Download PDFInfo
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- CN220050159U CN220050159U CN202321474563.5U CN202321474563U CN220050159U CN 220050159 U CN220050159 U CN 220050159U CN 202321474563 U CN202321474563 U CN 202321474563U CN 220050159 U CN220050159 U CN 220050159U
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- hole
- chamfer
- edge part
- edge
- drill bit
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- 230000007704 transition Effects 0.000 claims description 5
- 238000003754 machining Methods 0.000 abstract description 7
- 239000002131 composite material Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
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Abstract
The utility model provides a multistage step deep hole drill bit, which comprises a handle part and an edge part which are integrally connected, wherein the edge part is sequentially provided with a first hole edge part, a first chamfering edge part, a second hole edge part and a second chamfering edge part from an edge top to the handle part, the first hole edge part is used for forming a first hole part and preliminarily forming a second hole part, the second hole edge part is used for forming a third hole part, and the first chamfering edge part and the second chamfering edge part are respectively used for forming a first chamfer and a second chamfer; the outer diameter of the cutting edge of the edge part is provided with an inverted taper, and the inverted taper is 0.03-0.04/100. The multi-step deep hole primary processing can be realized, so that the finish machining of the subsequent reamer is facilitated, the edge part of the drill bit also has the reverse taper, the deep hole processing is facilitated, and the multi-step deep hole primary processing device has the characteristics of simple structure, long service life and the like.
Description
Technical Field
The utility model relates to the technical field of cutters, in particular to a multi-stage step deep hole drill bit.
Background
As shown in fig. 1, a plurality of step deep holes for assembly are provided in an engine end cover of an automobile. Because the depth of the hole is relatively large, the composite drill bit cannot be molded at one time in the prior art, and the drill bit and the reamer are matched to realize the machining of the composite drill bit, so that the machining precision of the composite drill bit is ensured. Therefore, the utility model provides a multi-stage step deep hole drill for processing step deep holes.
Disclosure of Invention
The technical problems to be solved by the utility model are as follows: in order to overcome the defects in the prior art, the utility model provides a multi-stage step deep hole drill bit.
The technical scheme adopted for solving the technical problems is as follows: the multi-stage deep hole drill bit comprises a three-stage step hole, a first hole part, a second hole part and a third hole part are respectively arranged from the bottom to the top of the hole, a first chamfer angle beta 1 used for transition is arranged between the first hole part and the second hole part, a second chamfer angle beta 2 is arranged at the end part of the third hole part, the drill bit comprises a handle part and an edge part which are integrally connected, the edge part is sequentially provided with a first hole edge part, a first chamfer angle edge part, a second hole edge part and a second chamfer angle edge part from the edge top to the handle part, wherein the first hole edge part is used for forming the first hole part and primarily forming the second hole part, the second hole edge part is used for forming the third hole part, and the first chamfer angle edge part and the second chamfer angle edge part are respectively used for forming the first chamfer angle and the second chamfer angle; the outer diameter of the cutting edge of the edge part is provided with an inverted taper, and the inverted taper is 0.03-0.04/100.
In order to improve the reliability and the service life of the drill bit, the joint of the second hole edge part and the second chamfer edge part is provided with an inward concave arc with the radius of R1, and the stress concentration of the joint of the drill bit is reduced through the inward concave arc, so that the transition of the joint of the second hole edge part and the second chamfer edge part is realized.
Further, the angle α1 of the first chamfer edge is equal to the angle β1 of the first chamfer.
Further, the angle α2 of the second chamfer edge is equal to the angle β2 of the second chamfer.
Since the height H5 of the first chamfer of the hole is 2.58mm and the height H4 of the second chamfer is 2.0mm, the height of the first chamfer edge portion is greater than that of the second chamfer edge portion by 2.58mm and 2.0mm, respectively.
Specifically, the aperture phi 1' of the first hole part is 7.8mm, the aperture phi 2' of the second hole part is 8.0mm, the aperture phi 3' of the third hole part is 10mm, the first chamfer angle beta 1 is 20 degrees, and the second chamfer angle beta 2 is 30 degrees.
Further, the diameter Φ1 of the first hole edge portion is 7.8mm, the length L4 is 47.27mm, the diameter Φ2 of the second hole edge portion is 9.8mm, and the length L3 is 18.04mm. Since the difference between the apertures of the first hole portion and the second hole portion is smaller than 0.2mm, the first hole blade portion is used for forming the first hole portion and pre-forming the second hole portion, and the second hole blade portion performs pre-forming, i.e. rough machining, on the third hole portion, and then performs finish machining on the second hole portion and the third hole portion by using a reamer.
Further, the top of the drill bit is a conical drill tip, and the taper angle alpha 3 of the drill tip is 140 degrees.
The beneficial effects of the utility model are as follows: the multi-step deep hole drill bit provided by the utility model can realize the primary processing of multi-step deep holes so as to facilitate the finish processing of subsequent reamers, and the edge part of the drill bit also has the reverse taper, thereby being more beneficial to the processing of deep holes, and having the characteristics of simple structure, long service life and the like.
Drawings
The utility model is further described below with reference to the drawings and examples.
FIG. 1 is a schematic partial structural view of an engine end cover to be machined.
Fig. 2 is a schematic structural view of the multi-stage stepped deep hole drill bit of the present utility model.
In the figure: 1. 1.1, first hole part, 1.2, second hole part, 1.3, third hole part, 1.4, first chamfer, 1.5, second chamfer, 2, shank, 3, cutting part, 3.1, first hole cutting part, 3.2, first chamfer cutting part, 3.3, second hole cutting part, 3.4, second chamfer cutting part, 4, spiral chip groove, 5, drill point.
Detailed Description
The utility model will now be described in further detail with reference to the accompanying drawings. The drawings are simplified schematic representations which merely illustrate the basic structure of the utility model and therefore show only those features which are relevant to the utility model, and orientation and reference (e.g., up, down, left, right, etc.) may be used solely to aid in the description of the features in the drawings. The following detailed description is, therefore, not to be taken in a limiting sense, and the scope of the claimed subject matter is defined only by the appended claims and equivalents thereof.
As shown in fig. 1, the structure schematic diagram of a multi-stage step deep hole on an engine end cover is shown, the multi-stage step deep hole 1 is a three-stage step hole, a first hole part 1.1, a second hole part 1.2 and a third hole part 1.3 are respectively arranged from the bottom to the top of the hole, a first chamfer 1.4 used for transition is arranged between the first hole part 1.1 and the second hole part 1.2, a second chamfer 1.5 is arranged at the end part of the third hole part 1.3, the angle beta 1 of the first chamfer 1.4 is 20 degrees, the angle beta 2 of the second chamfer 1.5 is 30 degrees, the aperture phi 1' of the first hole part 1.1 is 7.8mm, the aperture phi 2' of the second hole part 1.2 is 8.0mm, and the aperture phi 3' of the third hole part 1.3 is 10mm. The overall depth H1 of the multi-stage step deep hole 1 is 70mm, and the depth H2 from the orifice to the bottom of the second hole part 1.2 is 38mm, namely the depth of the third hole part 1.3+the second hole part 1.2+the first chamfer 1.4+the second chamfer 1.5; the depth H3 from the orifice to the bottom of the third bore portion 1.3 is 20mm.
As shown in fig. 2, the multi-stage deep hole drill comprises a shank 2 and a blade 3 which are integrally connected, wherein the blade 3 sequentially comprises a first hole blade 3.1, a first chamfer blade 3.2, a second hole blade 3.3 and a second chamfer blade 3.4 from a blade top to the shank 2, the first hole blade 3.1 is used for forming a first hole 1.1 and primarily forming a second hole 1.2, the second hole blade 3.3 is used for forming a third hole 1.3, and the first chamfer blade 3.2 and the second chamfer blade 3.4 are respectively used for forming a first chamfer 1.4 and a second chamfer 1.5; the outer diameter of the cutting edge of the edge part is provided with an inverted taper, and the inverted taper is 0.03-0.04/100; the top of the drill bit is a conical drill tip, the taper alpha 3 of the drill tip is 140 degrees, and the blade part is also provided with a spiral chip removal groove 4 which is convenient for timely discharging chips, and the spiral angle of the spiral discharge groove is about 20 degrees. In order to improve the reliability and the service life of the drill, the joint of the second hole edge part 3.3 and the second chamfer edge part 3.4 is provided with a concave arc with the radius of R1, and the stress concentration of the joint of the drill is reduced through the concave arc, so that the transition of the joint of the second hole edge part 3.3 and the second chamfer edge part 3.4 is realized.
Preferably, the angle α1 of the first chamfer edge portion 3.2 is equal to the angle β1 of the first chamfer 1.4, and α1=β1=20° in this embodiment; the angle α2 of the second chamfer edge 3.4 is equal to the angle β2 of the second chamfer 1.5, in an embodiment α2=β2=30°. Since the height H5 of the first chamfer 1.4 of the hole is 2.58mm and the height H4 of the second chamfer 1.5 is 2.0mm, the height of the first chamfer edge portion 3.2 is greater than the height of the second chamfer edge portion 3.4 by 2.58mm and 2.0mm, respectively. The diameter phi 1 of the first hole edge part 3.1 is 7.8mm and is matched with the aperture phi 1' of the first hole part 1.1; the length L4 of the first hole edge part 3.1 is 47.27mm, and is matched with the depth of the first hole part 1.1 and the second hole part 1.2; the diameter phi 2 of the second hole blade portion 3.3 is 9.8mm, and is slightly smaller than the inner diameter phi 3' of the third hole portion 1.3 due to rough machining, and the length L3 is 18.04mm. Since the difference between the diameters of the first hole portion 1.1 and the second hole portion 1.2 is relatively small and only 0.2mm, the first hole blade portion 3.1 is used for forming the first hole portion 1.1 and pre-forming the second hole portion 1.2, the second hole blade portion 3.3 performs pre-forming, i.e. rough machining, on the third hole portion 1.3, and then the second hole portion 1.2 and the third hole portion 1.3 are finished by using a reamer, and therefore, the protection of the reamer is not involved in the utility model, and therefore, a detailed description is not given here. In addition, the length L2 from the first hole edge portion 3.1 to the first chamfer edge portion 3.2 is 50.02mm; the overall length 1L of the drill was 125mm and the diameter phi 3 of the shank 2 was 14mm.
While the foregoing is directed to the preferred embodiment of the present utility model, other and further embodiments of the utility model may be devised without departing from the basic scope thereof, and the scope thereof is determined by the claims that follow. The technical scope of the present utility model is not limited to the description, but must be determined according to the scope of claims.
Claims (8)
1. Multistage step deep hole drill bit, multistage step deep hole is tertiary step hole, is first hole portion, second hole portion and third hole portion from hole bottom portion to top respectively, just be equipped with the first chamfer β1 that is used for the transition between first hole portion and the second hole portion, the tip of third hole portion is equipped with second chamfer β2, its characterized in that: the drill bit comprises a shank part and an edge part which are integrally connected, wherein the edge part comprises a first hole edge part, a first chamfering edge part, a second hole edge part and a second chamfering edge part in sequence from the edge top to the shank part, the first hole edge part is used for forming the first hole part and preliminarily forming the second hole part, the second hole edge part is used for forming a third hole part, and the first chamfering edge part and the second chamfering edge part are respectively used for forming a first chamfer and a second chamfer; the outer diameter of the cutting edge of the edge part is provided with an inverted taper, and the inverted taper is 0.03-0.04/100.
2. The multi-stage deep hole drill bit of claim 1, wherein: and the joint of the second hole edge part and the second chamfer edge part is provided with a concave arc with the radius of R1.
3. The multi-stage deep hole drill bit of claim 1, wherein: the angle alpha 1 of the first chamfer edge is equal to the angle beta 1 of the first chamfer.
4. A multi-stage deep hole drill bit according to claim 3, wherein: the angle alpha 2 of the second chamfer edge is equal to the angle beta 2 of the second chamfer.
5. The multi-stage deep hole drill bit of claim 1, wherein: the height of the first chamfering blade part is larger than that of the second chamfering blade part, and the height of the first chamfering blade part is 2.58mm and the height of the second chamfering blade part are 2.0mm respectively.
6. The multi-stage deep hole drill bit of claim 1, wherein: the aperture phi 1' of the first hole part is 7.8mm, the aperture phi 2' of the second hole part is 8.0mm, the aperture phi 3' of the third hole part is 10mm, the first chamfer angle beta 1 is 20 degrees, and the second chamfer angle beta 2 is 30 degrees.
7. The multi-stage deep hole drill bit of claim 6, wherein: the diameter phi 1 of the first hole blade part is 7.8mm, the length L4 is 47.27mm, the diameter phi 2 of the second hole blade part is 9.8mm, and the length L3 is 18.04mm.
8. The multi-stage deep hole drill bit of claim 1, wherein: the top of the drill bit is provided with a conical drill tip, and the taper angle alpha 3 of the drill tip is 140 degrees.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321474563.5U CN220050159U (en) | 2023-06-09 | 2023-06-09 | Multistage step deep hole drill bit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321474563.5U CN220050159U (en) | 2023-06-09 | 2023-06-09 | Multistage step deep hole drill bit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220050159U true CN220050159U (en) | 2023-11-21 |
Family
ID=88758935
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321474563.5U Active CN220050159U (en) | 2023-06-09 | 2023-06-09 | Multistage step deep hole drill bit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220050159U (en) |
-
2023
- 2023-06-09 CN CN202321474563.5U patent/CN220050159U/en active Active
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