CN202894423U - Diamond drill bit - Google Patents
Diamond drill bit Download PDFInfo
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- CN202894423U CN202894423U CN 201220374655 CN201220374655U CN202894423U CN 202894423 U CN202894423 U CN 202894423U CN 201220374655 CN201220374655 CN 201220374655 CN 201220374655 U CN201220374655 U CN 201220374655U CN 202894423 U CN202894423 U CN 202894423U
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- diamond
- blade
- cutter hub
- bit
- drill bit
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Abstract
The utility model provides a diamond drill bit which rotates around a rotation axis. The diamond drill bit comprises a rigid cutter body and a piece of diamond blade, wherein the rigid cutter body extends along the rotation axis, and the piece of diamond blade is welded at the tail end of the rigid cutter body. A first side face and a second side face are limited by the diamond blade, wherein the first side face and the second side face are reversed and parallel to each other. A first fixing part and a second fixing part are respectively limited in the first side face and the second side face, wherein the first fixing part and the second fixing part are used for welding the diamond blade and the rigid cutter body fixedly. The first fixing part and the second fixing part are basically symmetrical with each other to the rotation axis in a rotation mode on a plane of the rotation axis, wherein the first fixing part and the second fixing part are perpendicular to the plane of the rotation axis.
Description
Technical field
The utility model relates to a kind of diamond bit, relates in particular to a kind of diamond bit with minor diameter.
Background technology
As known in the art, drill bit is the cutter that is used to form the hole or carries out hole surface processing.Therefore, wish that usually drill bit can guarantee certain size precision and the surface roughness in hole.The drill bit of processing rigid material commonly used comprises solid carbide drill and high-speed steel drill.In the process of the hole of some high requests, use in a large number now solid carbide drills.But in some high rigidity, unmanageable nonmetallic materials (such as carbon fiber) and non-ferrous metals processing, end is provided with the drill bit of polycrystalline diamond (PCD) material and is promoting the use of.
Current polycrystalline diamond (PCD) drill bit is normally in existing solid carbide drill or the anterior welding of cutter hub PCD composite sheet.Used PCD composite sheet has two kinds of forms are arranged usually: a kind of is the two-layer compound sheet, and one side is nonweldable polycrystalline diamond layer, and another side is the hard alloy substrate layer that can weld; Another kind is three layers of " sandwich " composite sheet, and both sides are the hard alloy substrate layer, and the centre is polycrystalline diamond layer.
For the drill bit that double-deck PCD composite sheet is installed, because the non-welding character of polycrystalline diamond in order to form the cutting edge of drill bit, needs to use two double-deck PCD composite sheet splicings also to be welded to together on the carbide alloy cutter hub.For the second sandwich PCD composite sheet is installed, thereby although being carbide alloy, its both sides can be soldered on the carbide alloy cutter hub, but in order to form the cutting edge of drill bit, need to remove carbide alloy in corresponding position in both sides, and the polycrystalline diamond at the position behind the removal carbide alloy (rake face) is difficult to grind mirror effect, affects the processing serviceability of cutter.
More crucial is, because current PCD drill bit all is to adopt the PCD composite sheet to be fixed to the structure of carbide alloy cutter hub, and this PCD composite sheet is made of two layers or trilaminate material as mentioned above, and then the diameter of drill bit can not be too little.Because in the situation that the diameter of drill bit is fixed, when the PCD composite sheet is welded to the carbide alloy cutter hub, if subtract composite sheet too thin, then affect the mechanical property of drill bit; And if select thicker composite sheet, then need the corresponding size that reduces for the cutter hub of fixed blade part (matrix), cause like this matrix constant intensity of composite sheet to weaken.For example, process the thinnest 0.6mm of being of composite sheet behind the attenuate present postmenstruation, and its mechanical property is had a greatly reduced quality.Therefore, the polycrystalline diamond compact bit of current very difficult realization minor diameter (miniature), for example the diamond bit of diameter below 4mm is difficult to make of the method for PCD bonding pad.
For this reason, be desirable to provide a kind of drill bit that can have minor diameter (miniature), especially have the diamond bit less than or equal to 4mm, and this drill bit can not reduce or obviously reduce mechanical property and cutting ability simultaneously, is applicable to for example processing of hard material.
Summary of the invention
Task of the present utility model provides a kind of drill bit that can address the above problem at least in part.
To this, a kind of drill bit that the wraparound shaft axis rotates that is configured to is provided, comprise along described axis of rotation the rigidity cutter hub that extends and a slice one chip diamond blade that is welded on the described rigidity cutter hub end, described diamond blade limits and is essentially parallel to each other and opposite the first side and the second side, limits respectively the first standing part and the second standing part with described diamond blade and the solid welding of described rigidity cutter hub in described the first and second sides.Described the first standing part and described the second standing part perpendicular to the plane of described axis of rotation each other about the basic Rotational Symmetry of described axis of rotation.
And preferred, described rigidity cutter hub can comprise the carbide alloy cutter hub.
According to a special specific embodiment, described rigidity cutter hub has be used to a groove that holds described diamond blade, and wherein said the first and second standing parts lay respectively in the relative sidewall of described groove.
According to a preferred embodiment particularly, described welding is that vacuum is symmetrically welded.
Than the employing bilayer of prior art or the drill bit of three layers of PCD composite sheet, diamond bit of the present utility model provides a kind of structure theory of obvious difference.For example, the utility model provides a kind of diamond blade, its bilateral all is not pasted with carbide alloy or other patch materials, such diamond blade can carry out easily sharpening before being fixed to cutter hub, and can select thinner blade and can significantly not reduce the mechanical property of blade, thereby the intensity that is used for fixing cutter hub part (matrix) can correspondingly be protected.And because the symmetrical fixed form of this diamond blade, this drill bit provides further intensity.In addition, because this diamond blade was not coated with other materials such as carbide alloy fully before fixing, the surface quality of rake face can be worked in early stage very high quality.Therefore its than the PCD composite blade for example " sandwich " composite blade have better cutting ability.These above-mentioned advantages are that the PCD compact bit of mentioning in the background technology all can not provide.In addition, the very important point is, because special blade and the fixture construction of the utility model, and the bit diameter of the present utility model of reduced size at an easy rate in practice, for example less than or equal to about 4mm, this is very difficult maybe impossible realization of PCD compact bit of prior art.
According to a preferred embodiment of the present utility model, described diamond blade has by the blade thickness b that limits and in about about 0.4mm scope of 0.2mm-of the distance between described the first and second sides.Preferably, described drill bit is around having the drill bit working diameter D that limits less than or equal to about 4mm.
According to a preferred embodiment, described diamond blade comprise add man-hour at first cutting workpiece cutting edge and be positioned at the first rear bight and the second rear bight after the described cutting edge.The first rear bight have in about 10 °-about 15 ° of scopes the first relief angle α 1 and less than or equal to the about rear angular breadth of 0.05mm, and the second rear bight has the second relief angle α 2 in about 18 °-about 25 ° of scopes.Wherein, before cutting edge, on described the first and second sides, also limit respectively rake face.
According to another preferred embodiment of the present utility model, described diamond blade has towards the first tapered portion of end direction convergent and the second little tapered portion towards handle of a knife direction convergent that links to each other with this first tapered portion.Described the first tapered portion limits within being parallel to the plane of described side towards drift angle 2 Φ of apex point (being the least significant end of drill bit) direction.Described second little tapered portion limits towards the handle of a knife direction to be had at about 0.1/100 back taper to about 0.15/100 scope.
According to another preferred embodiment of the present utility model, described drill bit has the helical raised of spiraling around described axis of rotation or the helicla flute that is limited by adjacent helical raised.Preferably, described helical raised limits the helixangleβ about 0 °.
According to the utility model preferred embodiment again, described drill tip is limited with on the described plane perpendicular to described axis of rotation and sees the chisel edge that favours described side, and described chisel edge is with respect to described laterally inclined about 70 ° ± 10 ° angle.
Advantageously, described diamond blade can be natural diamond blade or artificial synthetic single crystal diamond blade.
According on the other hand of the present utility model, the method for a kind of manufacturing according to drill bit of the present utility model is provided, comprising: the rigidity cutter hub is provided; In the rigidity cutter hub, form the groove that holds blade; And be symmetrically welded by vacuum described blade is fixed to described groove.Described vacuum is symmetrically welded step and is included in and applies the vacuum solder flux in the described groove so that described diamond blade is tentatively adhered to described rigidity cutter hub, oven dry location and described drill bit is put into the heating of vacuum brazier finally to be welded and fixed blade to the rigidity cutter hub at described the first and second standing parts.
Manufacture method disclosed in the utility model is than prior art, and is more simple and convenient, the sharpening of for example having removed the splicing of two-layer compound sheet from and having removed three layers of composite sheet rake face from.
A part will be embodied hereinafter by reference to the accompanying drawings in other feature and advantage of the present utility model, and other parts will get it according to disclosed content by those skilled in the art.
Description of drawings
Below, describe by reference to the accompanying drawings embodiment of the present utility model in detail, wherein:
Fig. 1 has shown according to diamond bit of the present utility model, wherein also schematically shows the phantom in rear bight;
Fig. 2 shows the terminal zoomed-in view of drill bit;
Fig. 3 show in the view of Fig. 1 according to blade of the present utility model, wherein specifically illustrate the first and second tapered portion.
1-carbide alloy cutter hub; The 2-diamond blade; 3-the first standing part; 4-the second standing part; 5-cylinder land; The 6-chisel edge; 7-the first tapered portion; 8-second little tapered portion.
In drawing and description, same or analogous Reference numeral represents same or analogous feature.
The specific embodiment
Fig. 1 shows the front view of an embodiment of diamond bit, and this drill bit comprises carbide alloy cutter hub 1 and diamond blade 2, and is wherein as mentioned below, and this diamond blade is fixed to the end of cutter hub.Preferably, this blade is natural diamond blade or artificial synthetic single crystal diamond blade, thereby it can weld with rigidity cutter hub such as carbide alloy cutter hub.
This drill bit limits a work axis of rotation O-O '.Cutter when work around this work axis of rotation O-O ' rotation, and simultaneously towards the diagram left to doing axial feed, thereby take the diamond blade 2(cutting edge of blade specifically) be cutting structure drilling bore hole or form required hole surface in workpiece to be machined.As shown in the figure, described cutter hub 1 is along work axis of rotation O-O ' extension.
As shown in the figure, drill bit also is limited with a drill bit working diameter D, and this working diameter is corresponding to the diameter of formed respective aperture in the workpiece to be machined.Particularly this drill bit working diameter D is that external diameter by blade limits, and namely blade 2 has circumferential relative two sections cylinder lands, and this section cylinder land limits the working diameter D for the control Hole Wall Roughness when rotating at work.The diameter of cutter hub 1 is slightly smaller than blade 2 external diameters.This drill bit working diameter can be selected suitable value as required.But, can be less than or equal to 4mm according to drill bit working diameter D of the present utility model.
As shown in figures 1 and 3, blade 2 has towards first tapered portion and the second little tapered portion that links to each other with this first tapered portion of the end direction convergent of cutter hub 1.Can understand that from figure this first tapered portion has consisted of the terminal of this drill bit and limited drift angle 2 Φ of drill bit.In addition, although can not obviously find out from Fig. 1, second little tapered portion of this this blade has in the surface that Fig. 1 presents towards the back taper DZ of the end direction convergent of cutter hub, and this back taper DZ is roughly (0.1-0.15)/100.It is favourable for the processing stability is provided that such back taper is provided, if do not have back taper or back taper too small, can produce vibration during boring, produces chatter mark at hole wall.
As shown in the figure, drill bit (cutter hub 1) has the helical raised (being in the accompanying drawings 4) of spiraling around described axis of rotation O-O ' or the helicla flute that is limited by adjacent helical raised, and described helical raised limits the helixangleβ about 0 °.β is helical angle, and helicla flute mainly is for chip removal.
Continuation is with reference to figure 2, and it is that K among Fig. 1 is to partial enlarged view.Shown that diamond blade 2 has the first side parallel to each other and the second side (being shown as straight line in Fig. 2), in described the first and second sides, limit respectively the first standing part 3 and the second standing part 4 with described diamond blade and the solid welding of described rigidity cutter hub, wherein said the first standing part and described the second standing part perpendicular to the plane of described axis of rotation each other about the basic Rotational Symmetry of described axis of rotation O-O '.Can understand in conjunction with Fig. 1, be formed with in the cutter hub 1 be used to the groove that holds blade 2 that this groove overlaps with axis of rotation O-O in the symmetrical center line of drill axis direction.So this first standing part and the second standing part also correspondingly are arranged in the opposite flank of groove of cutter hub 1 each other about the rotational symmetric position of axis of rotation.In the shown accompanying drawing of Fig. 2, the first standing part and the second standing part equal the radius of cutter hub substantially on its lengthwise dimension, and namely its inboard end points is in the side the position near axis of rotation.But can understand that this depends on the actual plane perpendicular to axis of rotation O-O ' that intercepts.The vertical cutting plane place that for example intercepts at the root place along blade, the lengthwise dimension of the first and second standing parts is greater than the radius of cutter hub.But, the utility model general requirement is, in at least a portion plane (being preferably in the whole vertical cutting plane on the blade axial dimension) perpendicular to axis of rotation O-O ', the first and second standing parts of blade are parallel or substantially parallel about axis of rotation O-O ', thus the stress equilibrium of guarantee fund's diamond bit when making or during work.
Blade also has the cutting edge of drill bit, and it is to add the position that contact at first workpiece man-hour.And before cutting edge, on the first and second sides, limit respectively the rake face in the face of the workpiece to be processed part.As shown in Figure 2, especially on the plane perpendicular to axis of rotation O-O ', this rake face (and cutting edge) is in and the first and second standing parts 3,4 relative positions, the part that is not namely occupied by the first and second standing parts in the first and second sides of blade 2 among Fig. 2 generally.That is, in general, the rake face before cutting edge is relative with corresponding standing part.For example the rake face on the first side and the second standing part on the second side are opposite, and the first standing part on the rake face on the second side and the first side is opposite.It will be apparent to one skilled in the art that to be fixed to after the cutter hub according to blade of the present utility model (to limit the cutting edge orientation), namely define the operative orientation (rotation direction) of drill bit, a nearlyer step ground, when defining the spiral fluted rotation direction of cutter hub, namely determined the orientation of cutting edge, on the contrary also anti-.For example among the embodiment shown in Figure 2, the operative orientation of drill bit is counterclockwise.But opposite fixture construction and opposite rotation direction also are feasible and fall into the utility model scope.
In conjunction with Fig. 1, it will be appreciated by one of skill in the art that, before cutting edge, be provided with the rake face in the face of work surface, and after cutting edge, also be provided with the first rear bight and the second rear bight, the first rear bight has the first relief angle α 1 and rear angular breadth t, and the second rear bight has the second relief angle α 2.Wherein, the setting of relief angle is that those skilled in the art know, and the restriction of relief angle can limit by the angle between the corresponding edge of rear angle part and drift angle, as shown in Figure 1.Then angular breadth t then is the size that records in the plane perpendicular to the first and second sides.Arranging of the first relief angle α 1 and the first rear angular breadth t mainly is in order to cut roughness smooth and easy and processing base cone face, the utility model be preferably the first relief angle α 1 at 10 ° of-15 ° of scopes and rear angular breadth t less than or equal to 0.05mm; And arranging of the second relief angle α 2 mainly is in order to guarantee enough chip spaces, and the utility model is preferably in 18 ° of-25 ° of scopes.
As shown in Figure 2, diamond blade 2 has the blade thickness b that is limited by the distance between the first and second sides, and it is preferably in the 0.2mm-0.4mm scope.And thickness b also is the width of cylinder land, thereby the center deviator of rake face is b/2.When drilling, main cutting edge excision metal surplus, cylinder land control hole footpath size and hole wall surface roughness.By such setting, described drill bit has the drill bit working diameter D less than or equal to 4mm, and this diameter is to be limited by the cylinder land of blade when drill bit work (rotation).
As shown in the figure, described drill tip is limited with the i.e. line of demarcation between the rear bight after two cutting edges of chisel edge 6(that favours described side seeing perpendicular to the described plane of described axis of rotation), described chisel edge 6 is with respect to described laterally inclined 70 ° ± 10 ° chisel edge angle Ψ.
The preparation method of drill bit of the present utility model is described below in conjunction with Fig. 2.At first, be thin slice with diamond cut, then it is carried out two-sided the grinding, to reach different thickness, certain surface roughness and two depth of parallelisms that the side is certain of thin slice.The drill bit that diameter is less is selected the thinner diamond chip with thickness b, could guarantee to greatest extent like this intensity of cutter hub (matrix) part.Diamond chip thickness b=0.2-0.4mm for example.Next the rigidity cutter hub is provided, and can in cutter hub, forms for example cut-in groove subsequently.Certainly, provide and be with reeded cutter hub also in the utility model scope.Further, be symmetrically welded by double-face vacuum described blade is fixed to described groove, to guarantee the bulk strength of cutter.Two solders side on the cutter hub (matrix) will have enough depth of parallelisms, and the stress after guaranteeing diamond welding is minimum, in case diamond chip is owing to welding stress ruptures.
The concrete steps that vacuum is symmetrically welded comprise: apply the vacuum solder flux so that described diamond blade is tentatively adhered to described rigidity cutter hub at described the first and second standing parts in described groove, the intermediate temperature setting scolder is positioned at blade on the rigidity cutter hub; And described drill bit is put into the vacuum brazier heat finally to be welded and fixed blade to the rigidity cutter hub.
The utility model provides unique design philosophy for microbit especially.The method that is symmetrically welded with diamond blade has solved makes diameter less than the difficult problem of the miniature diamond bit of 4mm, and has carried out the optimal design of a plurality of bit parameters, has increased weld strength and cutter intensity, has reduced cutting force, makes drill bit increase the life-span.Reduce defective products, improved product quality, greatly reduced production cost, and improved production efficiency.
Although the utility model discloses exemplary embodiment, and described many details of the present utility model by these embodiment simultaneously, the applicant does not plan scope of the present utility model is confined to or is restricted in any form these details.After reading disclosure of the present utility model, other advantage and changing of the utility model is readily understood that to those skilled in the art.Therefore, can in the situation that does not break away from the desired thought of the present utility model of applicant and scope, make a change, for example the feature of embodiment interchangeable, in conjunction with, change and increase.The utility model scope is not to determine with reference to above-mentioned explanation, and should determine with reference to appended claims and all equivalency range thereof.
Claims (10)
1. diamond bit, described diamond bit is configured to the wraparound shaft axis and rotates, it is characterized in that, it comprises along described axis of rotation the rigidity cutter hub that extends and a slice one chip diamond blade that is welded on the described rigidity cutter hub end, described diamond blade limits the first parallel to each other and opposite side and the second side, in described the first and second sides, limit respectively the first standing part and the second standing part with described diamond blade and the solid welding of described rigidity cutter hub, wherein said the first standing part and described the second standing part perpendicular to the plane of described axis of rotation each other about described axis of rotation Rotational Symmetry.
2. diamond bit according to claim 1 is characterized in that, described rigidity cutter hub comprises the carbide alloy cutter hub.
3. diamond bit according to claim 1 is characterized in that, described rigidity cutter hub has be used to a groove that holds described diamond blade, and wherein said the first and second standing parts lay respectively in the relative sidewall of described groove.
4. diamond bit according to claim 1 is characterized in that, described welding is that vacuum is symmetrically welded.
5. each described diamond bit in 4 according to claim 1, it is characterized in that described diamond blade has by distance blade thickness that limit and in the 0.2mm-0.4mm scope (b) and/or drill bit between described the first and second sides and has drill bit working diameter (D) less than or equal to 4mm.
6. each described diamond bit in 4 according to claim 1, it is characterized in that, described diamond blade comprise add man-hour at first cutting workpiece cutting edge and be positioned at the first rear bight and the second rear bight after the described cutting edge, wherein the first rear bight have in 10 ° of-15 ° of scopes the first relief angle (α 1) and less than or equal to the rear angular breadth (5) of 0.05mm, and the second rear bight has the second relief angle (α 2) in 18 ° of-25 ° of scopes, wherein, before cutting edge, on described the first and second sides, also limit respectively rake face.
7. each described diamond bit in 4 according to claim 1, it is characterized in that, described diamond blade has towards the first tapered portion of end direction convergent and the second little tapered portion towards handle of a knife direction convergent that links to each other with this first tapered portion, described the first tapered portion limits the drift angle (2 Φ) towards the apex point direction within being parallel to the plane of described side, described second little tapered portion has the back taper in 0.1/100 to 0.15/100 scope.
8. each described diamond bit in 4 according to claim 1 is characterized in that described drill bit has the helical raised of spiraling around described axis of rotation or the helicla flute that is limited by adjacent helical raised.
9. each described diamond bit in 4 according to claim 1, it is characterized in that, the apex point of described drill bit is limited with on the described plane perpendicular to described axis of rotation and sees the chisel edge that favours described side, and described chisel edge is with respect to described laterally inclined 70 ° ± 10 ° angle.
10. each described diamond bit in 4 according to claim 1 is characterized in that described diamond blade is natural diamond blade or artificial synthetic single crystal diamond blade.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220374655 CN202894423U (en) | 2012-07-31 | 2012-07-31 | Diamond drill bit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220374655 CN202894423U (en) | 2012-07-31 | 2012-07-31 | Diamond drill bit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202894423U true CN202894423U (en) | 2013-04-24 |
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ID=48115140
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220374655 Expired - Lifetime CN202894423U (en) | 2012-07-31 | 2012-07-31 | Diamond drill bit |
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| Country | Link |
|---|---|
| CN (1) | CN202894423U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103909299A (en) * | 2014-03-18 | 2014-07-09 | 大连钢力刃具有限公司 | Diamond bit |
| CN105598509A (en) * | 2016-03-07 | 2016-05-25 | 大连理工大学 | Drill bit special for high-quality drilling of carbon fiber reinforced composite |
| CN107116349A (en) * | 2017-06-07 | 2017-09-01 | 马鞍山市恒利达机械刀片有限公司 | A kind of cutter production method |
-
2012
- 2012-07-31 CN CN 201220374655 patent/CN202894423U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103909299A (en) * | 2014-03-18 | 2014-07-09 | 大连钢力刃具有限公司 | Diamond bit |
| CN105598509A (en) * | 2016-03-07 | 2016-05-25 | 大连理工大学 | Drill bit special for high-quality drilling of carbon fiber reinforced composite |
| CN107116349A (en) * | 2017-06-07 | 2017-09-01 | 马鞍山市恒利达机械刀片有限公司 | A kind of cutter production method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee |
Owner name: SHENZHEN JUNTEC ULTRA-HARD TOOLS CO., LTD. Free format text: FORMER NAME: SHENZHEN JUNTEC PRECISION TOOLS CO., LTD. |
|
| CP03 | Change of name, title or address |
Address after: 518101 Guangdong city of Shenzhen province Baoan District Xin'an 67 District Liu Xian Road Jiaan Science Park No. 2 building two floor Patentee after: JUNTEC ULTRA-HARD TOOLS Co.,Ltd. Address before: 518101 Guangdong city of Shenzhen province Shenzhen Baoan District Xin'an 67 District Liu Xian Road Jiaan Science Park No. 2 building two floor Patentee before: SHENZHEN JUNTEC PRECISION TOOLS Co.,Ltd. |
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| CX01 | Expiry of patent term |
Granted publication date: 20130424 |
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| CX01 | Expiry of patent term |