CN101227992A - Drill bit - Google Patents
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- CN101227992A CN101227992A CNA2005800511260A CN200580051126A CN101227992A CN 101227992 A CN101227992 A CN 101227992A CN A2005800511260 A CNA2005800511260 A CN A2005800511260A CN 200580051126 A CN200580051126 A CN 200580051126A CN 101227992 A CN101227992 A CN 101227992A
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Abstract
To provide a drill enabling an increase in tool life while securing working efficiency. In this drill (1), a groove length (l) is set within the range of 6D to 10D where the outer diameter of the cutting edges (5) is D, the coating dimension of a hard compound on the surfaces of at least cutting edges (5) is set to 1.0 [mu]m or less, and the number of the cutting edges (5) is set to two. Since the chip discharging property and the rigidity of the drill can be synergistically increased, the lifetime of the drill (1) can be synergistically increased.
Description
Technical field
The present invention relates to a kind of drill bit, the particularly a kind of drill bit that can guarantee that working (machining) efficiency also can prolong life tools.
Background technology
Generally speaking, the line cutting processing is that to instigate electric current mainly be to flow in the brazen metal wire, and the processing that utilizes the discharge that produces to carry out.Carrying out the described man-hour that adds, need be cut the initial apertures of passing through the hole that wears on the material as metal wire,, utilizing discharge processing to wear initial apertures for the extra high material that is cut of hardness.
But, in discharge processing,, correspondingly have the problem of the working (machining) efficiency reduction of line cutting processing as a whole because working (machining) efficiency significantly reduces.
In addition, the high-precision hole of carrying out φ 0.5mmH7 tolerance on high hardness material adds man-hour, carries out preboring processing with the drill bit of φ 0.4mm in the past, utilizes the processing of line cutting carrying out profile guaranteeing the hole precision then, but has the phenomenal growth problem of process time.
Therefore, in TOHKEMY 2003-266223 communique, disclose the technology about following drill bit, this drill bit is cut material and also can wears initial apertures for high rigidity.According to this technology, be in the scope below the above 5D of 2D, so can guarantee the rigidity of drill bit because the axial length (flute length) of chip area is set in outer diameter D with respect to cutting edge.
As a result, above-mentioned drill bit can not lose the material that is cut of high rigidity is worn initial apertures, and compare with discharge processing and can improve working (machining) efficiency, correspondingly, can improve the working (machining) efficiency of whole line cutting.
In addition, in the present invention's product, can only substitute the H7 tolerance hole fine finishining of being undertaken by the combination of drill bit processing+line cutting, so process time can be shortened with machining.
Patent documentation 1: TOHKEMY 2003-266223 communique ([0021] section, Fig. 2 etc.)
But in the above-mentioned drill bit, the countermeasure of taking for the discharge of smear metal is not enough.Therefore, thus the existence meeting is lost the problem that reduces life tools owing to the obstruction of smear metal causes drill bit.
Summary of the invention
The present invention proposes in view of the above problems, and purpose is to provide a kind of drill bit, and this drill bit can be guaranteed working (machining) efficiency, and can prolong life tools.
In order to realize this purpose, the drill bit of technical scheme 1 has: the drill main body that rotates around the axle center, from the terminal part of this drill main body towards drillstock with helical form or roughly linearity be formed on slot part on the outer circumferential surface section, be formed on this slot part towards the wall of direction of rotation and the leading edge in the crest line portion between the above-mentioned outer circumferential surface section, and the cutting edge that is formed on the terminal part of above-mentioned drill main body, above-mentioned slot part is along the flute length just of the size on the direction in the axle center of above-mentioned drill main body, be set in the scope below the above 10D of 6D with respect to the outer diameter D of above-mentioned cutting edge, the surface of above-mentioned at least cutting edge is covered by the hard compounds overlay film, the thickness size of above-mentioned hard compounds is set in below the 1.0 μ m, and above-mentioned cutting edge constitutes by two.
The drill bit of technical scheme 5, in the drill bit of technical scheme 4, during above-mentioned surface roughening is handled, applying above-mentioned bias voltage, and will not apply in the one-period in the scope of time set below the above 2000nsec of 50nsec of negative voltage with being set in frequency period in the scope below the above 350kHz of 150kHz.
According to technical scheme 1 described drill bit, slot part is along the flute length just of the size on the direction in the axle center of drill main body, is set in the scope below the above 10D of 6D with respect to the outer diameter D of cutting edge.At this, during less than 6D, the discharge reduction of smear metal can be because the smear metal obstruction cause losing of drill bit at flute length.On the other hand, during greater than 10D, the rigidity of drill bit reduces, and causes losing of drill bit at flute length.From the above,, prevent losing of drill bit, realize the effect of the long lifetime of drill bit by flute length being set in the scope below the above 10D of 6D, having the discharge that to guarantee smear metal and the rigidity of drill bit.
In addition, because the surface of cutting edge is covered by the hard compounds overlay film at least, so have the wearability that to guarantee cutting edge, the effect that realizes the long lifetime of drill bit.
And then the thickness size of hard compounds is set in below the 1.0 μ m.At this, during greater than 1.0 μ m, cutting edge is by sphering in the thickness size of hard compounds, and sharpness reduces.Thus, the cut-out performance of smear metal reduces, and can cause that stopping up the drill bit that is caused by smear metal loses.Relative with it, as mentioned above,, then have the reduction that can suppress sharpness, and prevent losing of drill bit if the thickness size of hard compounds is set in below the 1.0 μ m, realize the effect of the long lifetime of drill bit.
In addition, cutting edge constitutes by two, so compared by three situations about constituting with cutting edge, can guarantee that leading edge is thick to the gauge sword of root face when axis direction is seen.Thus, have the rigidity that can guarantee drill bit, prevent losing of drill bit and realize the effect of the long lifetime of drill bit.
And, be set in the above-mentioned scope by sheet number and make up the thickness size of flute length, hard compounds and cutting edge, can improve the discharge of smear metal and the rigidity of drill bit simultaneously, the result has the effect that can correspondingly prolong bit life.
According to technical scheme 2 described drill bits, effect except technical scheme 1 described drill bit, because be to constitute by the so-called path drill bit that the outer diameter D with cutting edge is set in below the 1.0mm, thus losing of drill bit can be prevented, thus can process a plurality of paths hole.
Promptly, as mentioned above, by flute length is set in the scope below the above 10D of 6D, so can guarantee the discharge of smear metal and the rigidity of drill bit with respect to the outer diameter D of cutting edge, as a result, the effect that has the long lifetime of the path drill bit that can realize being difficult to guaranteeing the drill bit whole rigidity.
In addition, as mentioned above, the thickness size of hard compounds is set in below the 1.0 μ m.At this, under the situation of path drill bit, the thickness size of hard compounds is relatively large for cutting edge, and sharpness is had considerable influence.As a result, in the thickness size of hard compounds during greater than 1.0 μ m, the remarkable sphering of cutting edge, sharpness reduces.At this, be set in below the 1.0 μ m by thickness size hard compounds, have and can prevent the effect that drill bit is lost effectively.
In addition, owing to as mentioned above the sheet number of cutting edge is set at two, so can guarantee the rigidity of drill bit, the result has the effect of the long lifetime of the path drill bit that can realize being difficult to guaranteeing the drill bit whole rigidity.
As from the foregoing, be set in the above-mentioned scope by sheet number and make up the thickness size of flute length, hard compounds and cutting edge, particularly for the outer diameter D with cutting edge is set in path drill bit below the 1.0mm, can more effectively realize the long lifetime of drill bit.
According to technical scheme 3 described drill bits, except the effect that technical scheme 1 or 2 described drill bits are played, the thick gauge of the core that is formed by the bottom land of slot part is set in the scope below the above 0.55D of 0.35D with respect to the outer diameter D of cutting edge.At this, during less than 0.35D, the rigidity of drill bit reduces at the thick gauge of core, and drill bit is easily lost.
On the other hand, during greater than 0.55D, slot part shoals, the discharge reduction of smear metal at the thick gauge of core.As a result, can cause the deposited of smear metal, cause losing of drill bit.As from the foregoing, be set in the scope below the above 0.55D of 0.35D by the gauge that core is thick, can guarantee the rigidity of drill bit and the discharge of smear metal, the result has the effect of the long lifetime that can realize drill bit.
Drill bit according to technical scheme 4, effect except any described drill bit of technical scheme 1 to 3, implementing by to be set in frequency in the scope below the above 350kHz of 0kHz after cutting edge applies the surface roughening processing of surface bump that negative bias voltage makes cation and cutting edge, utilize sputtering method with hard compounds attached on the cutting edge.Like this, when carrying out the surface roughening processing, because bias voltage is periodically changed, so can improve the adhesive strength of hard compounds with respect to cutting edge, have the effect that can obtain excellent adhesive strength, for example can access the intensity more than the 80N under the critical load in scratch test.
And then, since utilize sputtering method with hard compounds attached on the cutting edge, so the maximum gauge that for example can make the minuteness particle that is known as macroparticle that is present in the hard compounds surface is below 10 μ m, and the ratio of the area that occupies of macroparticle is below 10%.As a result, have and the effect that processing just can access smoother overlay film surface such as do not carry out grinding.
In addition, according to technical scheme 5 described drill bits, except the effect that technical scheme 4 described drill bits are played, carry out the bias voltage of surface roughening when handling to apply with being set in frequency period in the scope below the above 350kHz of 150kHz, and, can improve the effect of hard compounds with respect to the adhesive strength of cutting edge so have with not applying in the one-period in the scope of time set below the above 2000nsec of 50nsec of negative voltage.
Description of drawings
Fig. 1 is the front view of the drill bit of one embodiment of the present invention.
Fig. 2 is the distal end faces figure of drill bit.
Fig. 3 is the figure of expression with the etching work procedure of the surface roughening of drill bit, (a) is the schematic diagram of the sputter equipment that uses in the etching work procedure, (b) is the state diagram that changes time of expression bias voltage.
Fig. 4 is the schematic diagram of the sputter equipment that uses in the sputtering process.
Fig. 5 is the figure of enlarged photograph of expression drill bit, (a) is the figure of enlarged photograph of the drill bit of expression present embodiment, (b) is the figure of the enlarged photograph of the existing drill bit of expression.
Fig. 6 is the figure of the result of the test of expression the 1st long duration test.
Fig. 7 is the figure of the result of the test of expression long duration test, is the figure of the result of the test of expression the 2nd long duration test (a), (b) is the figure of the result of the test of the 3rd long duration test.
Fig. 8 is the figure of the result of the test of expression efficiency test, (a) be the figure of the result of the test of expression the 4th efficiency test, (b) be the figure of the result of the test of expression the 5th efficiency test, (c) being the figure that the cross sectional photograph of the machining hole that drill bit of the present invention processes is used in expression, (d) is the figure of the cross sectional photograph of the machining hole that processes with discharging of expression.
Fig. 9 is the figure of the result of the test of expression the 6th efficiency test.
Description of reference numerals
1... drill bit
2... drillstock
3... drill main body
4... slot part
5... cutting edge
6... leading edge (leading edge)
L... flute length
D... the external diameter of cutting edge
O... axle center
W... the thick gauge of core
The specific embodiment
Below, with reference to description of drawings preferred implementation of the present invention.Fig. 1 is the front view of the drill bit 1 of expression one embodiment of the present invention.In addition, among Fig. 1, omitted the diagram of the axial length of drillstock 2 and drill main body 3.
In addition, drill bit 1 utilizes sputtering method described later on its surface and is formed with overlay film as the TiAlN of hard compounds, and the thickness size of this TiAlN is set in the following scope of 1.0 μ m.In addition, details aftermentioned (with reference to Fig. 7 (a)).
In addition, the drill bit 1 of present embodiment by being to add the carbide alloy that cobalt and pressure sintering as bond material forms in the micropowder of the tungsten carbide below the 1.0 μ m to constitute in average grain diameter, is guaranteed the hardness of drill bit 1.But, also might not be defined in this, also can be hard tool materials such as cermet, CBN (cubic boron nitride) sintered body, in addition, also steel material such as powder high-speed steel (sintering high-speed steel), high-speed tool steel and alloy tool steel.
Drillstock 2 is the positions that remain on the processing equipment, and in the present embodiment, its outside dimension is set at the outer diameter D greater than cutting edge 5, and constitutes the linearity with axle center O almost parallel.
Drill main body 3 has: form spiral helicine slot part 4 on its outer circumferential surface section, be formed on the terminal part of drill main body 3 cutting edge 5, be formed on the leading edge 6 in the crest line portion between the wall of direction of rotation and the outer circumferential surface section of slot part 4, the face of dodging 7 that is connected with the direction of rotation rear of cutting edge 5, and this drill main body 3 forms via connecting portion 8 and drillstock 2.
In addition, the slot part 4 of present embodiment forms to drillstock 2 helicallies from end side (Fig. 1 left side), but there is no need to be defined in this, also can form the linearity with axle center O almost parallel.
In addition, leading edge 6 is that the torsion angle expectation is set in the following scope of above 35 degree of 15 degree with the angle that straight line became that is parallel to axle center O.Thus, can guarantee the rigidity of drill main body 3 and the discharge of smear metal.
In addition, slot part 4 is set in respect to the outer diameter D of cutting edge 5 in the scope below the above 10D of 6D along flute length 1 expectation just of the size of axle center O direction.In addition, be described (with reference to Fig. 6) in the back for details.
Cutting edge 5 is to be used to utilize the revolving force of processing equipment and to be cut the part of the perforate processing of material, is arranged on the terminal part of drill main body 3.
In addition, in the present embodiment, the terminal angular of cutting edge 5 is set in 120 degree, but there is no need to be defined in this, as long as be set in the following scopes of above 140 degree of 110 degree.Thus, can guarantee the intensity and the corrosion resistance of cutting edge 5, can guarantee the hole precision and realize the long lifetime of drill bit 1.
Dodging face 7 is the faces of dodging in order to alleviate friction when cutting, and is connected with the direction of rotation rear of cutting edge 5.
Connecting portion 8 is the positions that connect drillstock 2 and drill main body 3, forms from drill main body 3 to the drillstock 2 crooked also tapers of hole enlargement.In addition, the taper angle theta of the connecting portion 8 of present embodiment is set at 20 degree, and arc radius R is set at 10.Thus, particularly in the drill bit 1 of the bigger present embodiment of the axial dimension L of drill main body 3 (the left and right directions size among Fig. 1), can relax the concentrated generation of stress that adds man-hour effectively, prevent losing of drill bit 1.
The terminal part of drill main body 3 then, is described with reference to Fig. 2.Fig. 2 is the distal end faces figure of drill bit 1.
In addition, the gauge W expectation that the core that is formed by the bottom land of slot part 4 is thick is set in respect to the outer diameter D of cutting edge 5 in the scope below the above 0.55D of 0.35D.At this, during less than 0.35D, the rigidity of drill bit 1 reduces at the thick gauge W of core, and drill bit 1 is lost easily.
On the other hand, during greater than 0.55D, slot part 4 shoals, the discharge reduction of smear metal at the thick gauge W of core.As a result, can cause the deposited of smear metal, cause drill bit 1 to be lost.As the above analysis, be set in the scope below the above 0.55D of 0.35D by the gauge W that core is thick, can guarantee the rigidity of drill bit 1 and the discharge of smear metal, the result can realize the long lifetime of drill bit 1.
In addition, the gauge W that core is thick carries out various changes according to the hardness that is cut material, for example, in the man-hour that adds of the high hardness material that surpasses 50HRC, expect that in order to ensure the rigidity of drill bit 1 the gauge W that core is thick is set in the scope below the above 0.55D of 0.45D, on the other hand, in the man-hour that adds of the soft material that carries out 40HRC, expect that in order to ensure the discharge of smear metal the gauge W that core is thick is set in the scope below the above 0.45D of 0.35D.
In addition, the drill bit 1 of present embodiment as shown in Figure 2, is set at two with the sheet number of cutting edge 5, guarantees that the thickness from leading edge 6 to root face (heel) is the thick gauge t of sword.In addition, details aftermentioned (with reference to Fig. 7 (b)).
Then, with reference to Fig. 3 to Fig. 5, the film formation method of hard compounds is described.Fig. 3 is the figure of expression with the etching work procedure of the surface roughening of drill bit 1, and Fig. 3 (a) is the schematic diagram of the sputter equipment 30 that uses in the etching work procedure, and Fig. 3 (b) is the state diagram that changes the time of expression bias voltage.Fig. 4 is the schematic diagram of the sputter equipment 30 that uses in the sputtering process.Fig. 5 is the figure of enlarged photograph of expression drill bit 1, and Fig. 5 (a) is the figure of enlarged photograph of the drill bit 1 of expression present embodiment, and Fig. 5 (b) is the figure of enlarged photograph of the drill bit of expression prior art.
In etching work procedure, shown in Fig. 3 (a), utilize the instrument mother metal 20 of bias supply 34 in being configured in cavity 32 to apply negative bias voltage, make positive argon ion Ar thus
+Impact tool mother metal 20 and carry out surface roughening.
At this moment, in the present embodiment, utilize controller 36 and shown in Fig. 3 (b) like that, make the bias voltage cyclically-varying.Particularly, with the frequency pulse shape of 250kHz apply-the negative bias voltage of 200V, in the application time of the negative voltage in each cycle, (for example also apply positive backward voltage, about+20V), and the time (application time of backward voltage) that does not apply this negative voltage is to be about 5000nsec the pulse reverse time, is about 1/8th of one-period (4000nsec).In addition, technical scheme 4 described surface roughening operations are meant etching work procedure.
In sputtering process, as shown in Figure 4, utilize power supply 40 to the target 38 of TiAl, the Ti etc. that constitute hard compounds apply negative certain bias voltage (for example-50V～-60V about), and utilize bias supply 34 (for example to apply negative certain bias voltage to instrument mother metal 20, about-100V), make argon ion Ar thus
+ Impact target 38 and hit constitutes such as TiAl, Ti.In cavity 32, except that argon gas, import nitrogen or hydrocarbon gas (CH with set flow
4, C
2H
2) TiAlN, TiCN, TiN of waiting reacting gas, its nitrogen-atoms N or carbon atom C to become to hit from target 38 etc., attached on the surface of instrument mother metal 20 and as hard film.In addition, also can apply positive voltage to instrument mother metal 20.
At this, as shown in Figure 5, (a) ((a-1), (a-2) and (a-3)) utilizes the coating method (etching of 200V, 250kHz, pulse reverse time=500nsec and sputter) identical with above-mentioned embodiment and the situation of formation TiAlN overlay film on the drill bit of carbide alloy system, and (b) ((b-1), (b-2) and (b-3)) utilizes the arc ion plating method and the situation that forms the TiAlN overlay film on identical shaped drill bit.In addition, (a-1) with (b-1), (a-2) with (b-2) and (a-3) with (b-3), be to utilize scanning electron microscope that the same section of each cutting edge is amplified 1000 times and shooting obtains.
From each photo of Fig. 5 as can be known, drill bit 1 of the present invention (with reference to Fig. 5 (a)) is compared with the drill bit in the past that utilizes the arc ion plating method to obtain (with reference to Fig. 5 (b)), and the minuteness particle that is known as macroparticle on surface tails off, and can access very level and smooth overlay film surface.In the scope of being measured by this photo, the maximum gauge of the macroparticle on the drill bit in the past is about 18 μ m, and occupied area is 20%, and is relative with it, and the maximum gauge of the macroparticle on the drill bit 1 of the present invention is about 6 μ m, and occupied area is 6%.
As above as can be known, according to the drill bit 1 of present embodiment, owing to utilize sputtering method to adhere to hard compounds, so the maximum gauge of macroparticle on surface that is present in this hard compounds is below 10 μ m, and the ratio of the area that macroparticle occupies can access level and smooth overlay film surface below 10%.Thus, can improve the machined surface roughness that is cut material, and need not to be used to remove because the attrition process of the caused overlay film protrusion of surface of macroparticle etc. by this drill bit 1 machining.
In addition, pre-treatment when utilizing sputtering method to adhere to hard compounds, applying to instrument mother metal 20-bias voltage of 200V and when carrying out etching (surface roughening processing), with the frequency period of 250kHz apply this bias voltage, and the time (pulse reverse time) that does not apply negative voltage in each cycle is for about 5000nsec, so can improve the adhesive strength of hard compounds to instrument mother metal 20, for example, can access the adhesive strength of the excellence more than the 100N under the critical load in scratch test, what can suppress owing to peel off etc. caused comes off, and can obtain can satisfying the practical durability that requires as cutting element.
In addition, it is that rectangular shape changes that the bias voltage in the present embodiment is pulse, but might not be defined in this, but other shapes such as waveform that for example also change continuously.
In addition, to not apply the time set of negative voltage in each cycle in the scope of 50～2000nsec in the present embodiment, but can be benchmark also for example with the one-period, be set in below 1/2 or 1/100～1/2 scope of one-period in, in 1/50～1/2 the scope etc.
The result of the test of 6 kinds of cutting tests using above-mentioned such drill bit that constitutes 1 to carry out (below, be called " the 1st long duration test " to " the 3rd long duration test ", " the 4th efficiency test " respectively to " the 6th efficiency test ") then, is described with reference to Fig. 6～Fig. 9.In addition, in the following description, use the Reference numeral (for example the external diameter of cutting edge 5 be " D ") identical to describe with above-mentioned drill bit 1.
Fig. 6 is the figure of the result of the test of expression the 1st long duration test.The 1st long duration test is the test that is used to investigate the influence that the durability of 1 pair of drill bit 1 of flute length produces, and among Fig. 6, makes the value of flute length 1 carry out various variations within the specific limits, tests and other machining condition is constant.
In addition, in this test,, utilize STEP processing to carry out the perforate processing of hole depth 5mm, carry out the comparison of the durability of drill bit 1 by calculating the processing hole count that this perforate processes with set cutting speed V and amount of feeding f.
In addition, STEP processing is to instigate drill bit 1 with respect to the machining hole turnover, discharges the smear metal in the slot part 4 simultaneously when withdrawing from, and interim the processing of deepening the depth dimensions of machining hole.That is, before slot part 4 is imbedded in the machining hole fully, all discharge smear metal, so can process consistently via slot part 4.After slot part 4 is imbedded in the machining hole fully, carry out the discharge of smear metal by from machining hole, extracting drill bit 1.Then, drill bit 1 is entered in the machining hole, and carry out the machining of machining hole, and extract drill bit 1 and discharge smear metal from machining hole 1 once more according to predefined STEP amount.Carry out the depth dimensions of above operation repeatedly up to the machining hole that reaches target.
The detail parameters of the 1st long duration test is: be cut material: the outer diameter D of SKD11 (60HRC), working depth: 5mm, cutting edge: axial dimension L:14D, the cutting speed V:31.5m/min of 0.5mm, drill main body, amount of feeding f:0.02mm/rev, STEP amount: 0.05mm.
As shown in Figure 6, when using flute length 1 to be set at the drill bit 1 of 4D and 5D, drill bit 1 had just been lost when the processing hole count was one, and difficult processing thereafter is to carry out.
In addition, using when flute length 1 is set at 6D to the drill bit 1 of 10D, drill bit 1 was not lost yet when the processing hole count was 100, can also continue afterwards to process.
In addition, when use was set at the drill bit 1 of 11D with flute length 1, drill bit 1 was lost when the processing hole count was 15, and difficult processing afterwards is to carry out.
By above result as can be known, during less than 6D, can't guarantee the discharge of smear metal, can think to have caused losing of drill bit 1 owing to the obstruction of smear metal at flute length 1.On the other hand, at flute length 1 during greater than 10D, thereby thinking that the rigidity of drill bit 1 reduces causes losing of drill bit 1.
Thus, in the time of in the scope that flute length 1 is set in below the above 10D of 6D, can guarantee the discharge of smear metal and the rigidity of drill bit 1, prevent losing of drill bit 1, realize the long lifetime of drill bit 1.
Then, Fig. 7 is the figure of the result of the test of expression long duration test, and Fig. 7 (a) is the figure of the result of the test of expression the 2nd long duration test, and Fig. 7 (b) is the figure of the result of the test of expression the 3rd long duration test.
At first, with reference to Fig. 7 (a) the 2nd long duration test is described.The 2nd long duration test is to be used to investigate the test of the thickness size of hard compounds to the influence of the durability generation of drill bit 1, among Fig. 7 (a), make the value of the thickness size of hard compounds in certain scope, carry out various variations, and make other machining condition constant and test.
In addition, in this test,, utilize STEP processing to carry out the perforate processing of hole depth 15mm, carry out the comparison of the durability of drill bit 1 by calculating the processing hole count that this perforate processes with set cutting speed V and amount of feeding f.
The detail parameters of the 2nd long duration test is: be cut material: axial dimension L:30D, the cutting speed V:25m/min of the outer diameter D of SUS420, working depth: 15mm, cutting edge: 0.5mm, drill main body, amount of feeding f:0.01mm/rev, STEP amount: 0.1mm.
Shown in Fig. 7 (a), when using the thickness size to be set at the drill bit 1 of 0.5 μ m and 0.9 μ m, drill bit 1 can not lost yet when the processing hole count was 5000, can also continue processing afterwards.
And when using the thickness size to be set at the drill bit 1 of 1.5 μ m, drill bit 1 was lost when the processing hole count was 1690, was difficult to continue processing afterwards.
When using the thickness size to be set at the drill bit 1 of 2.0 μ m, drill bit 1 was lost when the processing hole count was 283, was difficult to continue processing afterwards.
By The above results as can be known, during greater than 1.0 μ m, think that cutting edge 5 can be caused sharpness to reduce by sphering in the thickness size.Especially, the drill bit 1 of present embodiment is to be made of the path drill bit that outer diameter D is set at 0.5mm, so the thickness size is relatively large for cutting edge 5, sharpness is produced bigger influence.As a result, the cut-out performance of smear metal significantly reduces, and thinks can cause owing to losing of the drill bit 1 cause stopped up in smear metal.
Thus, be set in 1.0 μ m when following in thickness size with hard compounds, can suppress to prevent because losing of the drill bit 1 that the smear metal obstruction causes can realize the long lifetime of drill bit 1 effectively owing to sharpness reduces the reduction that performance is cut off in the smear metal that causes.
In addition, that the hard compounds in the present embodiment is used is TiAlN, but not necessarily is defined in this, also can use hard compounds such as TiN, TiC, TiCn.And then in the present embodiment, the whole surface of drill bit 1 is all covered by the hard compounds overlay film, but not necessarily is defined in this, gets final product to the surface coating of major general's cutting edge 5.
Then, with reference to Fig. 7 (b) the 3rd long duration test is described.The 3rd long duration test is to be used to investigate the test of the sheet number of cutting edge 5 to the influence of the durability of drill bit 1, among Fig. 7 (b), make the value of the thick gauge t of thick gauge W of sheet number, the core of cutting edge 5 and sword carry out various changes within the specific limits, and make other machining condition constant and test.
In addition, in this test,, utilize STEP processing to carry out the perforate processing of hole depth 15mm, carry out the comparison of the durability of drill bit 1 by calculating the processing hole count that this perforate processes with set cutting speed V and amount of feeding f.
In addition, the detail parameters of the 3rd long duration test is that SKD11, cutting speed V are fixed as the 30m/min except being cut material, and is identical with the detail parameters of above-mentioned the 2nd long duration test.
Shown in the No.1 hurdle, be set at that two, gauge W that core is thick are set at 0.19mm and the thick gauge t of sword when being set at 0.27mm at sheet number with cutting edge 5, drill bit 1 is not also lost when the processing hole count is 74, can process.Think that reason is, be set at two, can guarantee that the thick gauge t of sword promptly guarantees the rigidity of drill bit 1, realize the long lifetime of drill bit 1 by sheet number with cutting edge 5.
Then, shown in the No.2 hurdle, be set at two at sheet number with cutting edge 5, the gauge W that core is thick is set at 0.25mm and the gauge t that sword is thick when being set at 0.36mm, up to the processing hole count is moment of 81, and drill bit 1 is not lost yet, and can process.Think that reason is, can similarly guarantee the rigidity of drill bit 1, realize the long lifetime of drill bit 1 with the drill bit 1 on No.1 hurdle.
In addition, the drill bit 1 of No.2 is compared with the drill bit 1 of No.1, and the gauge t that gauge W that core is thick and sword are thick is big, thus think the rigidity that can further guarantee drill bit 1, thus further realize the long lifetime of drill bit 1.
Then, shown in the No.3 hurdle, be set at 3 at the sheet number with cutting edge 5, the gauge W that core is thick is set at 0.19mm, and the gauge t that sword is thick is when being set at 0.13mm, and drill bit 1 is lost when the processing hole count is 9, and difficult processing afterwards is to carry out.Think that reason is, can't guarantee that the thick gauge t of sword guarantees the rigidity of drill bit 1 when the sheet number of cutting edge 5 is set at 3, thereby cause drill bit 1 to be lost.
Then, shown in the No.4 hurdle, be set at 3 at sheet number with cutting edge 5, the gauge w that core is thick is set at 0.25mm, and the gauge t that sword is thick is when being set at 0.17mm, and drill bit 1 has just been lost when the processing hole count is 1, and difficult processing afterwards is to carry out.Think that reason is identical with the drill bit 1 of No.3, can't guarantee the rigidity of drill bit 1, cause drill bit 1 to be lost.
In addition, the drill bit 1 of No.4 is compared with the drill bit 1 of No.3, although the thick gauge t of thick gauge W of core and sword is bigger, the life-span of drill bit 1 is shorter.This error that can think to test causes.
By above result as can be known, be set at two, can guarantee the gauge t of cutting edge 5, promptly guarantee the rigidity of drill bit 1, can realize the long lifetime of drill bit 1 by sheet number with cutting edge 5.Especially, when the path drill bit that is set at 0.5mm by outer diameter D as the drill bit 1 of present embodiment constitutes, be difficult to guarantee the rigidity of drill bit 1,, can realize the long lifetime of drill bit 1 effectively so be set at two by sheet number with cutting edge 5.
Then, Fig. 8 is the figure of the result of the test of expression efficiency test, Fig. 8 (a) is the figure of the result of the test of expression the 4th efficiency test, Fig. 8 (b) is the figure of the result of the test of expression the 5th efficiency test, Fig. 8 (c) is the figure that the cross sectional photograph of the machining hole that drill bit 1 of the present invention processes is used in expression, and Fig. 8 (d) is the figure that expression utilizes the cross sectional photograph of the machining hole that discharge processes.
At first, with reference to Fig. 8 (a) and (b) explanation the 4th and the 5th efficiency test.The the 4th and the 5th efficiency test is the test that is used to investigate the stock-removing efficiency of drill bit 1 of the present invention, under set cutting speed V and amount of feeding f, utilize STEP processing to carry out the initial apertures processing of working depth, process the needed time and relatively use the processing that drill bit 1 of the present invention carries out and the efficient of discharge processing by calculating this initial apertures for 15mm.
The detail parameters of the 4th efficiency test is, is cut material: SKD11 (blank), working depth: 15mm, machining fluid: axial dimension L:30D, the cutting speed V:31.4m/min of the outer diameter D of water-soluble machining fluid, cutting edge: 0.5mm, drill main body, amount of feeding f:0.01mm/rev, STEP amount: 0.1mm.
In addition, the detail parameters of the 5th efficiency test is that HPM31, amount of feeding f are that 0.015mm/rcv and STEP amount are fixed as the 0.15mm except being cut material, and is identical with the detail parameters of above-mentioned the 4th efficiency test.
Shown in Fig. 8 (a), when using drill bit 1 of the present invention, process the needed time and be 100s (second), relative with it, in discharge was processed, processing the required time was 200s.
In addition, shown in Fig. 8 (b), when using drill bit 1 of the present invention, processing the needed time is 60s, relative with it, and in discharge processing, processing the needed time is 200s.
By above result as can be known, when using drill bit 1 of the present invention, the situation that adds man-hour with discharge is compared, and stock-removing efficiency can be brought up to more than the twice.That is, can improve the stock-removing efficiency of initial apertures, correspondingly improve the working (machining) efficiency of line cutting processing.
In addition, shown in Fig. 8 (c) and Fig. 8 (d), use drill bit 1 of the present invention and the section of the machining hole that processes is compared level and smooth in the extreme with the section of the machining hole that utilizes discharge to process.In addition, use the surface roughness Ry (maximum height of the machining hole that drill bit 1 of the present invention processes, with reference to calendar year 2001 this industrial standard (JIS) of subsisting) value be 1.130 μ m, on the other hand, utilize discharge processing and the value of the surface roughness Ry of the machining hole that processes is 11.349 μ m.
Hence one can see that, and drill bit 1 of the present invention is compared with discharge processing, the Surface Machining of machining hole can be got more smoothly,, can precision process machining hole well that is.
Then, Fig. 9 is the figure of the result of the test of expression the 6th efficiency test.The 6th efficiency test is the test that is used to investigate the stock-removing efficiency of drill bit 1 of the present invention, under set cutting speed V and amount of feeding f, utilize the perforate processing of STEP processing carrying out hole depth 5mm, process the needed time by calculating this perforate, use the comparison of the efficient of the processing of drill bit 1 of the present invention and line cutting processing.In addition, the precision prescribed of machining hole is, diameter dimension is 0.5mm, and dimensional tolerance is H7.
The detail parameters of the 6th efficiency test is, is cut material: the outer diameter D of PD613 (63HRC), working depth: 5mm, cutting edge: the axial dimension of 0.5mm, drill main body: 10D, cutting speed V:31.5m/min, amount of feeding f:0.02mm/rev, STEP amount: 0.05mm.
As shown in Figure 9, under the situation of using drill bit 1 of the present invention, process the needed time and be 79s (second), relative with it, in the online cutting processing, processing the required time is 706s.
By above result as can be known, when using drill bit 1 of the present invention, compare, stock-removing efficiency can be brought up to 9 times with the situation of line cutting processing.Simultaneously, drill bit 1 of the present invention can access the machining hole precision same with the line cutting processing.
In addition, the required time of line cutting processing was meant from the time of the process finishing that wears after the initial apertures machining hole.Thus, drill bit 1 of the present invention need not to wear initial apertures needed process time, correspondingly can improve working (machining) efficiency.
And then, owing to need not to make metal wire to pass through operation in the initial apertures, so can realize the simplification of operation and the shortening of activity duration.
More than, according to embodiment the present invention has been described, but the present invention is not limited to the respective embodiments described above, can easily infer and can carry out various improvement distortion without departing from the spirit and scope of the present invention.
Claims (5)
1. drill bit, have: the drill main body that rotates around the axle center, from the terminal part of this drill main body towards drillstock with helical form or roughly linearity be formed on slot part on the outer circumferential surface section, be formed on wall and the leading edge in the crest line portion between the above-mentioned outer circumferential surface section and the cutting edge that is formed on the terminal part of above-mentioned drill main body towards direction of rotation of this slot part, it is characterized in that
Above-mentioned slot part is along the flute length just of the size on the direction in the axle center of above-mentioned drill main body, is set in the scope below the above 10D of 6D with respect to the outer diameter D of above-mentioned cutting edge,
The surface of above-mentioned at least cutting edge is covered by the hard compounds overlay film,
The thickness size of above-mentioned hard compounds is set in below the 1.0 μ m,
Above-mentioned cutting edge constitutes by two.
2. drill bit as claimed in claim 1 is characterized in that the outer diameter D of above-mentioned cutting edge is set in below the 1.0mm.
3. drill bit as claimed in claim 1 or 2 is characterized in that, the thick gauge of the core that is formed by the bottom land of above-mentioned slot part is set in the scope below the above 0.55D of 0.35D with respect to the outer diameter D of above-mentioned cutting edge.
4. as any described drill bit of claim 1 to 3, it is characterized in that, implementing by apply the surface roughening processing of surface bump that negative bias voltage makes cation and above-mentioned cutting edge to above-mentioned cutting edge after, utilize sputtering method with above-mentioned hard compounds attached on the above-mentioned cutting edge
During above-mentioned surface roughening is handled, to apply above-mentioned bias voltage with being set in frequency period in the scope below the above 350kHz of 0kHz.
5. drill bit as claimed in claim 4, it is characterized in that, during above-mentioned surface roughening is handled, applying above-mentioned bias voltage, and will not apply in the one-period in the scope of time set below the above 2000nsec of 50nsec of negative voltage with being set in frequency period in the scope below the above 350kHz of 150kHz.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2005800511260A CN101227992A (en) | 2005-07-20 | 2005-07-20 | Drill bit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2005800511260A CN101227992A (en) | 2005-07-20 | 2005-07-20 | Drill bit |
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| Publication Number | Publication Date |
|---|---|
| CN101227992A true CN101227992A (en) | 2008-07-23 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2005800511260A Pending CN101227992A (en) | 2005-07-20 | 2005-07-20 | Drill bit |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102476209A (en) * | 2010-11-22 | 2012-05-30 | 佑能工具株式会社 | Drilling tool |
| CN103370156A (en) * | 2011-02-23 | 2013-10-23 | 京瓷株式会社 | Cutting tool and method for manufacturing same |
-
2005
- 2005-07-20 CN CNA2005800511260A patent/CN101227992A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102476209A (en) * | 2010-11-22 | 2012-05-30 | 佑能工具株式会社 | Drilling tool |
| CN102476209B (en) * | 2010-11-22 | 2015-05-06 | 佑能工具株式会社 | Drilling tool |
| CN103370156A (en) * | 2011-02-23 | 2013-10-23 | 京瓷株式会社 | Cutting tool and method for manufacturing same |
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Open date: 20080723 |