CN210046051U - Hard alloy twist drill resisting single-side stress - Google Patents
Hard alloy twist drill resisting single-side stress Download PDFInfo
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- CN210046051U CN210046051U CN201920839212.7U CN201920839212U CN210046051U CN 210046051 U CN210046051 U CN 210046051U CN 201920839212 U CN201920839212 U CN 201920839212U CN 210046051 U CN210046051 U CN 210046051U
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- 229910045601 alloy Inorganic materials 0.000 title claims abstract description 16
- 239000000956 alloy Substances 0.000 title claims abstract description 16
- 238000005520 cutting process Methods 0.000 claims abstract description 56
- 238000005553 drilling Methods 0.000 abstract description 7
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 238000000034 method Methods 0.000 abstract description 4
- 230000007547 defect Effects 0.000 abstract description 2
- 238000003754 machining Methods 0.000 abstract description 2
- 239000002184 metal Substances 0.000 abstract description 2
- 229910052751 metal Inorganic materials 0.000 abstract description 2
- 238000005266 casting Methods 0.000 description 6
- 239000002173 cutting fluid Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 230000001788 irregular Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 229910001141 Ductile iron Inorganic materials 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000000110 cooling liquid Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000000284 resting effect Effects 0.000 description 1
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Abstract
The utility model discloses an anti unilateral atress carbide fluted drill belongs to metal cutting machining cutter field. The cutting tool comprises a tool handle and a cutting part, wherein the cutting part is provided with two main cutting edges, each main cutting edge comprises a straight line part and an arc part, and the arc part is smoothly tangent to one of the ridge belts; the arc part is tangent to the straight line part; the two main cutting edges are connected through the chisel edge; the cylindrical surface of the cutting part is provided with a spiral blade back and a spiral chip groove, and the blade back is provided with two convex ridge belts. The twist drill overcomes the defects that when a standard hard alloy twist drill is used and an irregular-shaped crevasse is arranged at an outlet or a rib wall in a drilling process, a processed hole is inclined, even a cutter is broken, the precision of a processed part is not easy to guarantee, and the like. The cutting tool can still stably cut under the working condition of single-side stress or uneven stress, the durability of the cutting tool is high, the processed hole is not inclined, the linearity is good, the hole diameter meets the requirement, and the production efficiency can be improved by about one third.
Description
Technical Field
The utility model relates to a metal cutting machining cutter field, concretely relates to anti unilateral atress carbide fluted drill.
Background
When a common twist drill is used for cutting a casting, the common twist drill often touches or drills a convex rib width and an outlet and meets an extremely irregular orifice of a casting with a geometric shape such as an inclined plane, a corner, an R angle and the like, so that two cutting edges of the twist drill are stressed unevenly, and the drilled orifice is inclined, bent and poor in linearity; the irregular casting can cause the fracture of a screw tap or a reamer used in the next procedure; and the twist drill is easily broken at the drilling to the outlet.
In the prior art, holes with poor processing manufacturability, such as ribbed widths, irregular shapes of orifices and the like, of a drilling casting are generally drilled in advance by using a small-diameter drill bit in a low-feed mode, the ribbed widths, inclined planes, R angles and the like are avoided, and then, a milling cutter is inserted for slow hole expansion; so production efficiency is lower, and the minor diameter fluted drill that bores the pre-hole also is the easy rupture. Therefore, the twist drill with good precision and long service life under the condition of poor manufacturability is urgently needed.
SUMMERY OF THE UTILITY MODEL
The utility model provides a can drill out the better hole in linearity and aperture, difficult rupture, long service life, production efficiency are high anti unilateral atress carbide fluted drill.
In order to achieve the above purpose, the present invention is realized by the following technical solutions:
the hard alloy twist drill capable of resisting unilateral stress comprises a tool shank and a cutting part, wherein the cutting part is provided with two main cutting edges which are arranged in a non-complete straight line; the two main cutting edges are connected through the chisel edge; the cylindrical surface of the cutting part is provided with a spiral blade back and a spiral chip groove, and the blade back is provided with two convex ridge belts.
Furthermore, the main cutting edge comprises a straight line part and an arc part, and the arc part is smoothly tangent to one of the ridge belts; the arc portion is tangent to the straight portion.
Further, the included angle between the straight portions of the two main cutting edges is 140 ° to 148 °.
Further, the length of the circular arc part is 1/3-3/5 of the length of the main cutting edge.
Further, the arc radius of the arc part is 0.23-0.47 times of the diameter of the cutting part.
Furthermore, a groove is arranged on the blade back.
Furthermore, one of the chords of the ridge is 1/6 of the chords of the back of the blade, and the chord of the other ridge of the ridge is 1/2 of the chords of the back of the blade.
Further, the arc length of the groove is 1/3 of the chord length of the blade back
The utility model discloses anti unilateral atress carbide fluted drill, its beneficial effect lies in:
(1) the defects that when a standard hard alloy twist drill is used and an irregular-shaped crevasse is arranged at an outlet or a rib wall in a drilling process, a processed hole is inclined, even a cutter is broken, the precision of a processed part is not easy to guarantee, and the like are overcome.
(2) The cutting tool can still stably cut under the working condition of single-side stress or uneven stress, the durability of the cutting tool is high, the processed hole is not inclined, the linearity is good, the hole diameter meets the requirement, and the production efficiency can be improved by about one third.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.
FIG. 1 is a schematic structural diagram of a twist drill resisting single-side stress;
FIG. 2 is an enlarged view of the cutting head B of FIG. 1;
FIG. 3 is a cross-sectional view A-A of FIG. 1;
FIG. 4 is a schematic view of an edge of an internal thread on a workpiece resting on a casting wall;
FIG. 5 is a sectional view in the direction F-F in FIG. 4;
FIG. 6 is a schematic view of the hole in the workpiece at the casting turn (broken wall hole);
FIG. 7 is a top view of FIG. 6;
1 handle, 2 cutting parts, 3 main cutting edges, 4 chisel edges, 5 blade backs, 6 spiral chip grooves, 7 ridge belts, 8 grooves, 9 straight parts, 10 circular arc parts,
Detailed Description
The present invention will be described in further detail with reference to the following embodiments and accompanying drawings.
A hard alloy twist drill resisting unilateral stress comprises a tool shank 1 and a cutting part 2, wherein the cutting part 2 is provided with two main cutting edges 3, and the two main cutting edges 3 are arranged in a non-complete straight line; the two main cutting edges 3 are connected through the chisel edge 4, and the included angle between the straight line parts 9 of the two main cutting edges 3 is 140-148 degrees; the cylindrical surface of the cutting part 2 is provided with a spiral blade back 5 and a spiral chip groove 6, the main cutting edge 3 comprises a straight line part 9 and an arc part 10, and the arc part 10 is smoothly tangent to one of the ridge belts 7; the circular arc part 10 is tangent to the straight line part 9, two convex edge belts 7 are arranged on the blade back 5, the chord length of one edge belt 7 is 1/6 of the chord length of the blade back 5, and the chord length of the other edge belt 7 is 1/2 of the chord length of the blade back 5. The blade back 5 is provided with a groove 8, and the arc length of the groove 8 is 1/3 of the chord length of the blade back 5. The arc radius of the arc part is 0.23-0.47 times of the diameter of the cutting part.
The included angle of the straight parts 9 of the two main cutting edges 3, namely the frontal angle, is 140 degrees to 148 degrees, 148 degrees is taken under the condition of not adding cutting fluid, 140 degrees is taken when adding the cutting fluid, and the specific data are listed as follows:
| working conditions/parameters | Length of linear cutting edge | Arc cutting edge | Radius of arc cutting R |
| Adding |
2/5L | 3/5L | 0.47D |
| Without adding |
2/ |
1/3L | 0.23D |
Note: l refers to the main cutting edge length; d denotes the cutting portion diameter.
The unilateral stress resistant hard alloy twist drill tool material adopts submicron particle YL10.2 hard alloy, and the surface of the drilling section is coated with a TIALN coating; the runout of the side cutting edge and the end cutting edge which are axially and radially opposite to the tool holder 1 as the reference is lower than 0.008 mm. The concentricity of the knife handle 1 and a main shaft of the CNC machine tool is less than 0.01 mm; the strength of the cutter can be improved, the surface hardness is high, the cutter can resist impact, and the friction coefficient during processing is small. The helix angle of the cutting part 2 is 30 degrees, the primary clearance angle is 10 degrees, and the secondary clearance angle is 25 degrees.
Drilling effect;
effect one
On a CNC machine tool, a certain product 'z-axis base' part is machined, four manufacturability poor wall breaking M6 screw holes are formed in each part, the bottom hole is D5, the shape is shown in figures 4 and 5, the workpiece material is Q400 nodular cast iron, the depth of the screw hole is 16mm, and the drilling depth is 22 mm.
The second effect is that:
on a CNC machine tool, a certain product 'y-axis base' part is machined, each part is provided with 26M 5 screw holes, the bottom hole is D4.2, as shown in figures 4 and 5, the workpiece material is Q400 nodular cast iron, the depth of the screw holes is 22mm, and about 20 percent of the screw holes are wall breaking holes. The process requires no cooling liquid and can be air-cooled.
The conclusion is obtained through a long-time cutting experiment and field processing of products, the hard alloy twist drill resisting unilateral stress is not easy to wear and break a cutter under the conditions of uneven stress of opposite sides and severe working conditions, has high durability, good linearity of a processed hole, improves working efficiency, reduces cost and has strong practicability, and is a novel twist drill.
The technical solutions provided by the embodiments of the present invention are described in detail above, and the principles and embodiments of the present invention are explained herein by using specific examples, and the descriptions of the above embodiments are only applicable to help understand the principles of the embodiments of the present invention; meanwhile, for a person skilled in the art, according to the embodiments of the present invention, there may be variations in the specific implementation manners and application ranges, and in summary, the content of the description should not be construed as a limitation to the present invention.
Claims (8)
1. The utility model provides an anti unilateral atress carbide fluted drill which characterized in that: the cutting tool comprises a tool handle and a cutting part, wherein the cutting part is provided with two main cutting edges which are arranged in a non-complete straight line; the two main cutting edges are connected through the chisel edge; the cylindrical surface of the cutting part is provided with a spiral blade back and a spiral chip groove, and the blade back is provided with two convex ridge belts.
2. The hard alloy twist drill resisting unilateral stress according to claim 1, wherein: the main cutting edge comprises a straight line part and an arc part, and the arc part is smoothly tangent to one of the ridge belts; the arc portion is tangent to the straight portion.
3. The hard alloy twist drill resisting unilateral stress according to claim 2, wherein: the angle between the straight portions of the two main cutting edges is 140-148.
4. The hard alloy twist drill resisting unilateral stress according to claim 3, wherein: the length of the circular arc part is 1/3-3/5 of the length of the main cutting edge.
5. The hard alloy twist drill resisting unilateral stress according to claim 2, wherein: the arc radius of the arc part is 0.23-0.47 times of the diameter of the cutting part.
6. The hard alloy twist drill resisting unilateral stress according to claim 1, wherein: the blade back is provided with a groove.
7. The hard alloy twist drill resisting unilateral stress according to claim 1, wherein: one of the chord lengths of the edge belts is 1/6 of the chord length of the blade back, and the chord length of the other edge belt is 1/2 of the chord length of the blade back.
8. The hard alloy twist drill resisting unilateral stress according to claim 6, wherein: the arc length of the groove is 1/3 of the chord length of the blade back.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920839212.7U CN210046051U (en) | 2019-06-05 | 2019-06-05 | Hard alloy twist drill resisting single-side stress |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920839212.7U CN210046051U (en) | 2019-06-05 | 2019-06-05 | Hard alloy twist drill resisting single-side stress |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210046051U true CN210046051U (en) | 2020-02-11 |
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ID=69397308
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920839212.7U Active CN210046051U (en) | 2019-06-05 | 2019-06-05 | Hard alloy twist drill resisting single-side stress |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210046051U (en) |
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2019
- 2019-06-05 CN CN201920839212.7U patent/CN210046051U/en active Active
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