CN102310215B - Drilling tool - Google Patents
Drilling tool Download PDFInfo
- Publication number
- CN102310215B CN102310215B CN2011101403311A CN201110140331A CN102310215B CN 102310215 B CN102310215 B CN 102310215B CN 2011101403311 A CN2011101403311 A CN 2011101403311A CN 201110140331 A CN201110140331 A CN 201110140331A CN 102310215 B CN102310215 B CN 102310215B
- Authority
- CN
- China
- Prior art keywords
- boring bar
- major trough
- bar tool
- equal
- drill bit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K3/00—Apparatus or processes for manufacturing printed circuits
- H05K3/0011—Working of insulating substrates or insulating layers
- H05K3/0044—Mechanical working of the substrate, e.g. drilling or punching
- H05K3/0047—Drilling of holes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B26—HAND CUTTING TOOLS; CUTTING; SEVERING
- B26F—PERFORATING; PUNCHING; CUTTING-OUT; STAMPING-OUT; SEVERING BY MEANS OTHER THAN CUTTING
- B26F1/00—Perforating; Punching; Cutting-out; Stamping-out; Apparatus therefor
- B26F1/16—Perforating by tool or tools of the drill type
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B2251/00—Details of tools for drilling machines
- B23B2251/24—Overall form of drilling tools
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B2251/00—Details of tools for drilling machines
- B23B2251/40—Flutes, i.e. chip conveying grooves
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B26—HAND CUTTING TOOLS; CUTTING; SEVERING
- B26F—PERFORATING; PUNCHING; CUTTING-OUT; STAMPING-OUT; SEVERING BY MEANS OTHER THAN CUTTING
- B26F2210/00—Perforating, punching, cutting-out, stamping-out, severing by means other than cutting of specific products
- B26F2210/08—Perforating, punching, cutting-out, stamping-out, severing by means other than cutting of specific products of ceramic green sheets, printed circuit boards and the like
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Life Sciences & Earth Sciences (AREA)
- Forests & Forestry (AREA)
- Mechanical Engineering (AREA)
- Drilling Tools (AREA)
Abstract
The invention provides a drilling tool, which is capable of preventing chip winding and capable of stably drilling holes by using a small-diameter drill bit with a diameter smaller than 0.7 mm, in particular smaller than 0.4 mm, and achieves long breakage-resistant lifetime and excellent practicability. The tail end of a tool body (1) is equipped with one or more cutting blades. Multiple helical chip-evacuating grooves are formed in the outer circumference of the tool body (1) from the tail end of the tool body to the base end, wherein the multiple chip-evacuating grooves at least comprise one main groove (2a) and one auxiliary groove (2b). The one or more auxiliary grooves (2b) are joined with the main groove (2a) at the halfway portion of the main grove (2a). In addition, the join portion (6) where the main groove (2a) and the auxiliary groove (2b) are joined has class difference (7).
Description
Technical field
The present invention relates to a kind of boring bar tool.
Background technology
Use drill bit as shown in Figure 1 in the Drilling operation of printed circuit board (PCB) (PCB), this drill bit consists of the A of drill body section with blade C and drill shank B.Different according to purposes, the size of drill bit is also varied, but generally speaking, uses the drill bit of diameter below 0.7mm more.
Particularly, on blade C, periphery in main body 20 is formed with from the spiral helicine chip area 22 of drill tip towards base end side as shown in Figure 2, intersects with the major first flank 24 that is arranged at end the intersection crest line section that forms at the rake face by this chip area 22 and is formed with cutting edge 21 (for example with reference to patent documentation 1,2).In addition, in the drawings, label 25 is the second rear knife face, and this second rear knife face 25 is arranged at the instrument direction of rotation rear side of major first flank 24 continuously, and d ' is tool diameter, and l ' is the flute length of chip area, and α ' is helical angle.
In addition, as being cut material, the non-ferrous metal classes such as aluminium alloy, titanium, magnesium and copper have the overlay film of wearability and deposit resistance property, noncrystal carbon overlay film has obtained practical, noncrystal carbon overlay film is covered on the cutting elements such as drill bit, slotting cutter or cutter head exchangeable cutting tool and uses (for example with reference to patent documentation 3).
In addition, PCB is by with copper and the bonding parts that form of insulating barrier, this insulating barrier is by forming resin-dipping in glass fabric, in order further to improve reliability, in recent years PCB is required to improve heat resistance, strengthens bending strength and reduces thermal expansion, and the mechanical strength that forms the glass fabric of PCB or resin by raising has guaranteed that the PCB of high reliability is more and more.
; when carrying out being cut material and considering of Drilling operation; raising along with the mechanical strength of the PCB of said structure; correspondingly easily promote the wearing and tearing of drill bit, thus easily cause with Drilling operation in drill bit lose the deterioration of the hole qualities such as position, hole precision that accompany with excessive wear.
On the other hand, along with the densification of PCB, desired aperture (diameter of drill bit) be path year by year, and the Drilling operation of diameter below 0.4mm is more and more.
In addition, in the Drilling operation operation, consider working (machining) efficiency, be in general that the PCB of multiple same sizes is overlapping and carry out Drilling operation.Particularly, ordinary circumstance is, at the upper surface of multiple overlapping PCB, places aluminium sheet or with the centering degree that the aluminium sheet of resin is used as improving drill bit, is the cover plate of purpose and carries out Drilling operation, and described aluminium sheet with resin has resin in surface coverage.Aluminium sheet with resin is compared with aluminium sheet, and it improves the better effects if of centering degree, and it helps to improve losing of drill bit, so particularly multiplex in diameter in the Drilling operation of the small diameter drill bit below 0.4mm.
In recent years, even for the PCB small diameter drill bit that uses in the processing at the poor PCB of machinability as described above, also requiring to cut down processing cost is that purpose increases the overlapping number of PCB and the boring life-span that the prolongation drill bit can not carry out Drilling operation with losing.
; compare while with the use aluminium sheet, carrying out Drilling operation; when using aluminium sheet with resin to carry out Drilling operation as cover plate; near smear metal has occurred the significantly base end part of the blade C of drill bit coiling is residual; the viscosity of resin is higher or resin that cover is thicker; the residual trend of the coiling of described smear metal occurring just higher, realizes that above-mentioned requirements is also just more difficult.
This can think because: usually, the smear metal that produces during Drilling operation is attracted by the incidental chip sucking function of drilling machine and is taken out of to predetermined disposal box, but in the situation that use is with the aluminium sheet of resin, heat in metal cutting during by Drilling operation and resin and the smear metal of having softened together are imported into chip area and are discharged from, and near the base end part of blade C so that the bonding mode of smear metal and drill bit have an effect, and then can think, by repeatedly carrying out continuously Drilling operation, the coiling residual quantity of smear metal increases.
can think: although the rotating speed of the drill bit of the coiling residual quantity of smear metal during according to Drilling operation and the material of these processing conditions of feed speed and PCB change, but significant smear metal can occur as shown in Fig. 3 (a) coiling is residual, in the Drilling operation of the residual lasting generation of coiling of this smear metal, this smear metal (smear metal piece) waits and breaks away from as opportunity from drill bit take certain vibration, even drilling machine has described suction function, this smear metal (smear metal piece) also can't be attracted but fall on cover plate, thereafter, the drill bit that carries out Drilling operation interferes with the smear metal piece that has fallen, thereby cause the deterioration of position, hole precision and losing of drill bit.In Fig. 3 (b) exemplified with the smear metal piece that drops on cover plate.
In addition, although for example disclose following technology in patent documentation 4, namely, on the PCB drill bit with 2 cutting edges and 2 chip areas, each chip area is converged in the position that has retreated scheduled volume from end, form a groove at the rear of point, the rigidity of drill bit is improved, but the coiling for smear metal in patent documentation 4 is not mentioned, can not meet above-mentioned requirements.
Patent documentation 1: Japanese kokai publication sho 56-39807 communique
Patent documentation 2: TOHKEMY 2006-55915 communique
Patent documentation 3: TOHKEMY 2001-341021 communique
Patent documentation 4: TOHKEMY 2007-307642 communique
Summary of the invention
The present invention completes in view of present situation as described above, it provides a kind of boring bar tool, this boring bar tool can prevent the coiling of smear metal, even diameter 0.7mm is following, the following small diameter drill bit of 0.4mm particularly, it is anti-, and to lose the life-span also very long, can realize stable Drilling operation, and have very outstanding practicality.
With reference to accompanying drawing, purport of the present invention is described.
The present invention relates to a kind of boring bar tool, its end at tool body 1 is provided with one or more cutting edges, periphery at this tool body 1 is provided with from the spiral helicine a plurality of chip areas of tool tip towards base end side, these a plurality of chip areas comprise 1 major trough 2a and 1 secondary groove 2b at least, and being arranged to one or more secondary groove 2b converges at middle part and the described major trough 2a of described major trough 2a, described boring bar tool is characterised in that, the fluidic junction 6 of converging at described major trough 2a and described secondary groove 2b is provided with ladder and differs from 7.
In addition, boring bar tool described according to technical scheme 1, is characterized in that, described ladder differs from 7 by making different formation of groove depth of described major trough 2a and described secondary groove 2b.
In addition, boring bar tool described according to technical scheme 1, is characterized in that, described ladder differs from 7 more than or equal to 2 μ m.
In addition, boring bar tool described according to technical scheme 2, is characterized in that, described ladder differs from 7 more than or equal to 2 μ m.
In addition, boring bar tool described according to technical scheme 3, is characterized in that, described ladder differs from 70% of 7 groove depths less than or equal to major trough 2a.
In addition, boring bar tool described according to technical scheme 4, is characterized in that, described ladder differs from 70% of 7 groove depths less than or equal to major trough 2a.
In addition, boring bar tool described according to any one in technical scheme 1～6, is characterized in that, the helical angle by making described major trough 2a or described secondary groove 2b, with different at the instrument base end side, converges described major trough 2a and described secondary groove 2b in the tool tip side.
In addition, boring bar tool described according to any one in technical scheme 1～6, is characterized in that, described fluidic junction 6 is arranged at 50% the position of the Distance tool end less than or equal to the flute length l of described major trough 2a.
In addition, boring bar tool described according to technical scheme 7, is characterized in that, described fluidic junction 6 is arranged at 50% the position of the Distance tool end less than or equal to the flute length l of described major trough 2a.
In addition, boring bar tool described according to technical scheme 8 is characterized in that described boring bar tool is coated with the lubricity overlay film.
In addition, boring bar tool described according to technical scheme 9 is characterized in that described boring bar tool is coated with the lubricity overlay film.
In addition, boring bar tool described according to technical scheme 10, is characterized in that, adopts noncrystal carbon overlay film as described lubricity overlay film.
In addition, boring bar tool described according to technical scheme 11, is characterized in that, adopts noncrystal carbon overlay film as described lubricity overlay film.
In addition, boring bar tool described according to technical scheme 12 is characterized in that the diameter of instrument is less than or equal to 0.7mm.
In addition, boring bar tool described according to technical scheme 13 is characterized in that the diameter of instrument is less than or equal to 0.7mm.
In addition, boring bar tool described according to technical scheme 12 is characterized in that the diameter of instrument is less than or equal to 0.4mm.
In addition, boring bar tool described according to technical scheme 13 is characterized in that the diameter of instrument is less than or equal to 0.4mm.
Because the present invention forms as described above, therefore formed following such boring bar tool: the coiling that can prevent smear metal, even diameter 0.7mm is following, the following small diameter drill bit of 0.4mm particularly, it is anti-, and to lose the life-span also very long, can realize stable Drilling operation, and have very outstanding practicality.
Description of drawings
Fig. 1 is the summary description side view of PCB with drill bit.
Fig. 2 is the amplification summary description figure of conventional example.
(a) of Fig. 3 carries out illustrative photo near the coiling of the smear metal the base end part of the blade C that is positioned at drill bit is residual, and (b) of Fig. 3 carries out illustrative photo to the smear metal piece that drops on cover plate.
Fig. 4 is the summary description figure of the blade of the present embodiment.
Fig. 5 is the summary description figure of amplification of the end portion of Fig. 4.
Fig. 6 is along the cutaway view of the A-A line in Fig. 5 (b).
Fig. 7 is form and the curve map that experimental result is shown.
Fig. 8 illustrates the reeling condition of smear metal of comparative example 1 and the photo of cover plate after processing.
Fig. 9 is the photo of reeling condition that the smear metal of comparative example 2 is shown.
Figure 10 illustrates the reeling condition of smear metal of embodiment 1 and the photo of cover plate after processing.
Label declaration
1: tool body; 2a: major trough; 2b: secondary groove; 6: fluidic junction; 7: ladder is poor; L: flute length.
The specific embodiment
Effect of the present invention is shown and the preferred embodiment of the present invention is carried out simple explanation based on accompanying drawing.
When the smear metal that results from tool tip section with Drilling operation the time is discharged along chip area, collide each other in the fluidic junction 6 that major trough 2a and secondary groove 2b converge mutually by making smear metal, and the ladder of the fluidic junction 6 of converging mutually by major trough 2a and secondary groove 2b differs from 7, therefore make smear metal in fluidic junction 6 (to instrument radially) thereby disperse forcibly to be difficult to arrive the instrument base end part, prevented that smear metal from reeling at the instrument base end part.
Embodiment
Based on Fig. 4～Figure 10, specific embodiments of the invention are described.
The present embodiment is following such boring bar tool: the end at tool body 1 is provided with one or more cutting edges, periphery at this tool body 1 is provided with from the spiral helicine a plurality of chip areas of tool tip towards base end side, these a plurality of chip areas comprise 1 major trough 2a and 1 secondary groove 2b at least, and being arranged to one or more secondary groove 2b converges at middle part and the described major trough 2a of described major trough 2a, and the fluidic junction 6 that described boring bar tool converges mutually at described major trough 2a and described secondary groove 2b is provided with ladder and differs from 7.
Particularly, the present embodiment is following such drill bit: tool diameter is 0.075mm, and be respectively equipped with 1 major trough 2a and 1 secondary groove 2b, the flute length l of described major trough 2a is 1.2mm, described secondary groove 2b and this major trough 2a converge, the crossing crest line section of intersecting of knife face (major first flank), be provided with integratedly cutting edge with described tool body 1 respectively, and described drill bit is used for the Drilling operation of PCB after the end of the rake face of this major trough 2a and secondary groove 2b and described tool body 1.
The Drilling operation of this PCB carries out with for example following such state: experimental example is such as described later, 5 PCB as the semiconductor-sealing-purpose of hard-cutting material (substrate: thickness is that 0.1mm/ surface and the back side are the Cu layer) are overlapping, the upper surface of overlapping PCB placed thickness be the aluminium sheet with resin of 0.1mm as cover plate, and in order to carry out through hole processing, at the lower surface of described PCB, configured generally the thickness that uses as backing plate (Homes て plate) the paper phenol parts (paper Off エ ノ one Le material) as 1.5mm.The thickness of cover plate is suitably set in the scope of 0.04～1.0mm.In addition, thickness is that the thickness of Cu layer of the PCB of about 0.1mm is typically about 2～80 μ m.
In addition, although be that the drill bit (two-point bit) with 2 cutting edges and 2 chip areas (a major trough 2a and a secondary groove 2b) is described in the present embodiment, for the situation that only is provided with the single cutting bit of cutting edge and the drill bit more than three swords (drill bit that for example has 1 major trough and 2 secondary grooves) in the major trough side too.
More specifically, because aforesaid smear metal easily occurs under condition as described above coiling is residual, therefore, in order to address this problem, the illustrated instrument of Fig. 2 is improved, covered noncrystal carbon overlay film on tool body 1, at the major trough 2a of drill bit, be provided with the 3 and second spiral zone 4, the first spiral zone, described the first spiral zone 3 has the first pitch angle alpha will
1, described the second spiral zone 4 is connected in the instrument base end side in the first spiral zone 3 and has than the first pitch angle alpha will
1The second large pitch angle alpha will
2(the pitch angle alpha will of secondary groove 2b
3Fixing), major trough 2a and secondary groove 2b are converged mutually (with reference to Fig. 4, Fig. 5.In addition, (a)～Fig. 5 of Fig. 5 (c) observes respectively the figure of the end portion in Fig. 4 with different rotatable phases).
in addition, can be also following such structure: be not at major trough 2a, but at secondary groove 2b, or major trough 2a and secondary groove 2b both sides, the first spiral zone is set and thereby the spiral of being connected is regional makes major trough 2a converge mutually (being connected setting) with secondary groove 2b, can be also following such structure: the helical angle by making major trough 2a or secondary groove 2b towards the instrument base end side at leisure (curved shape ground) change (increase) major trough 2a converged mutually with secondary groove 2b, can be also following such structure: by the helical angle that changes from the beginning major trough 2a and secondary groove 2b, major trough 2a is converged mutually with secondary groove 2b.
In addition, the ladder that is positioned at the fluidic junction 6 that major trough 2a and secondary groove 2b converge mutually differ from 7 take the effect of dispersing that realizes smear metal as purpose, by making different formation of groove depth of major trough 2a and secondary groove 2b, in the groove depth of major trough 2a and secondary groove 2b, which is more all right, does not limit.Particularly, X more deeply forms ladder and differs from 7 than the groove depth of secondary groove 2b (secondary groove depth, secondary groove 2b are in the situation that the darkest distance on the tool radius direction) Y in the groove depth by making major trough 2a (the major trough degree of depth, the darkest distance of major trough 2a on the tool radius direction), will collide each other and can not converge in the smear metal that fluidic junction 6 is converged, thereby smear metal be to radially dispersing.In addition, in the situation that by the groove depth Y that makes secondary groove 2b, than the groove depth X of major trough 2a, more deeply form ladder, differ from 7, thereby secondary groove 2b discharges space and disappear, thereby smear metal is to radially dispersing in the cell wall collision of fluidic junction 6 disappearance smear metals and major trough 2a.
In addition, in the present embodiment,, in order to avoid the danger of losing that causes due to the emery wheel trace of recording and narrating in detail below, by the groove depth Y that makes secondary groove 2b, than the shallow ladder that forms of the groove depth X of major trough 2a, differ from 7 (with reference to expression Fig. 6 along the cutaway view of the A-A line in Fig. 5 (b)).
Preferably this ladder being differed from 7 is set as more than or equal to 2 μ m and less than or equal to 70% of the groove depth X of major trough 2a.If described ladder differs from 7 less than 2 μ m, possibility at major trough 2a generation emery wheel trace while making is high, stress concentrates on this emery wheel trace and likely makes this emery wheel trace become the starting point of losing, thereby the possibility of losing is increased, and can worsen and affect position, hole precision due to the rigidity of instrument.Described ladder is differed from 7 in the present embodiment 1 and be set as 3 μ m (the groove depth X of major trough 2a 37%), described ladder is differed from 7 in the present embodiment 2 and be set as 5.2 μ m (the groove depth X of major trough 2a 64%).In addition, if described ladder differs from 70% of the 7 groove depth X greater than major trough 2a, secondary groove 2b can become shallow, therefore may hinder necessary MIN chip discharge, thereby this is not preferred (although not shown in Fig. 7, but according to ladder being differed from 7 experimental results of 74% drill bit that are set as the groove depth X of major trough 2a, drill bit has occurred to lose).
In addition, in this application, will converge starting point (the Distance tool end is the position of O) to converging zone till end point (the Distance tool end is the position of P) as fluidic junction 6 from what major trough 2a and secondary groove 2b converged.In addition, ladder differs from 7 measuring position and is in this application, as what major trough 2a and secondary groove 2b converged, converges starting point and converges centre position Q, position that converge (being connected setting) central point between end point.
In addition, with the cardinal extremity position with fluidic junction 6 (major trough 2a with secondary groove 2b the end point of converging) be arranged on the Distance tool end less than or equal to the mode of 50% the position of the flute length l of major trough 2a set the first spiral zone 3 be connected spiral zone 4 each helical angle and be connected setting position.In this case, chip area has become one within the Distance tool end surpasses 50% the zone of flute length l, thereby has improved the rigidity of instrument, and then has improved position, hole precision.When fluidic junction 6 being arranged on the Distance tool end than 50% position by rear (base end side) of the flute length l of major trough 2a, the capacity of groove increases, and the rigidity of instrument worsens, thereby the possibility that position, hole precision worsens and instrument is lost increases.In the present embodiment, with the cardinal extremity set positions of fluidic junction 6 at the Distance tool end, be 32% the position of flute length l.
Each several part is specifically described.
About this drill bit, adopt following such superhard alloy prepared material as base material, and the chip area at tool body 1 is coated with noncrystal carbon overlay film at least, described superhard alloy prepared material consists of the hard particles take WC as main component and the bond material take Co as main component, and the average grain diameter of the WC particle of this superhard alloy is 0.1 μ m～2 μ m, and Co content counts 5%～15% with % by weight.Because noncrystal carbon overlay film is hard, therefore the wearing and tearing of instrument have been suppressed, therefore and, because noncrystal carbon overlay film has high-lubricity, make smear metal be easy to along chip area to tool body 1 base end part and discharge, thereby prevented that the obstruction of smear metal from making drill bit be difficult to lose.
In addition, in the present embodiment, adopted noncrystal carbon overlay film that the noncrystal carbon (DLC) by following such high rigidity forms as the lubricity overlay film, the noncrystal carbon (DLC) of described high rigidity form take carbon atom as main body and Vickers hardness more than 3000, but as long as Vickers hardness is more than 2000, also can adopt by the lower noncrystal carbon (DLC) of hardness ratio or DLC and the overlay film that mixture that other materials (for example metal) mix mutually forms, also can adopt other the lubricity overlay film such as chromium nitride.
In addition, noncrystal carbon overlay film is formed on base material with being close to base material in the present embodiment, but can be also following such structure for example: be close to base material ground form on base material formed by following metal or semimetal, thickness is at the lower floor's coating layer (counterdie) below 200nm and below 1nm, and forming described noncrystal carbon overlay film on this lower floor's coating layer, described metal or semimetal consist of the one kind or two or more element of selecting the 4a family from the periodic table of elements, 5a family, 6a family and Si.In addition, as lower floor's coating layer, be not limited to said structure, also can adopt the structure that is formed by following compound, the compound that described compound is the one kind or two or more element selected 4a family, 5a family, 6a family and Si from the periodic table of elements, form with the element chemical combination more than a kind of selecting from nitrogen and carbon.
In addition, the present embodiment has used the film formation device of arc ion plating mode when noncrystal carbon overlay film and counterdie film forming, but also can use the PVD film formation device of sputter mode or laser ablation mode etc.
The first pitch angle alpha will
1Be set to 30 °～45 °.Helical angle can have influence on chip discharge and drill bit rigidity, and its relation is that if set helical angle larger, although chip discharge raising, the rigidity of drill bit reduces conversely.In the situation that small diameter drill bit, the anti-property lost of drill bit not only easily is subjected to rigidity but also easily is subjected to the impact of chip discharge.Therefore, with diameter, be preferably below 0.7mm, particularly the helical angle of the drill bit below 0.4mm is set greatlyr, generally be set between 40 °～50 °.
the present inventor etc. are in order further to improve the anti-property lost of drill bit, helical angle to these two opposite characteristics of rigidity and chip discharge of showing drill bit has carried out repeatedly studying, consequently recognize: in the situation that be cut the upper surface of thing, place aluminium sheet or such with the aluminium sheet of resin, or in the situation that there is more Copper Foil in ectonexine that is cut thing etc., if 30 ° of helical angle less thaies, thereby the chip discharge deterioration is easily lost drill bit, when helical angle being set larger than 45 °, the raising due to chip discharge makes the anti-property lost raising, but the smear metal of aluminium or copper forms thin and long, thereby the coiling that smear metal easily occurs at the base end part (root) of tool body 1 (chip area) is residual.
In addition, the present inventor etc. have found out following situation: for the drill bit that is coated with the lubricity overlay films such as noncrystal carbon overlay film, although with do not have cated drill bit to compare to have the effect that improves the anti-property lost, but the coiling that smear metal can occur significantly is residual, the coiling residue (smear metal piece) of this smear metal is dropped on cover plate, and drill bit and the smear metal piece that falls are interfered, thus, exist position, hole precision to worsen and drill bit anti-lost unstable and situation about losing in advance of life-span.
Consider these situations, preferably: helical angle (first pitch angle alpha will of the cutting edge part of the tool tip that will cut
1And the pitch angle alpha will of secondary groove 2b
3) be set as the angle (30 °～45 °) below 45 °, to guarantee chip discharge and to make the smear metal of generation shorter and can not reel.More preferably with above-mentioned helical angle (the first pitch angle alpha will
1And the pitch angle alpha will of secondary groove 2b
3) be set between 35 °～45 °.In the present embodiment with the first pitch angle alpha will of major trough 2a
1And the pitch angle alpha will of secondary groove 2b
3Be set as 38 °.
With the second pitch angle alpha will
2Be set as than the first pitch angle alpha will
1Large angle more than 5 °, and be set between 35 °～65 °.By with the second pitch angle alpha will
2Set than the first pitch angle alpha will
1Greatly, the chip discharge raising of the base end side of chip area, the anti-property the lost raising of instrument.
In addition, the discharge direction of the smear metal of discharging swimmingly along the chip areas in the first spiral zone 3 is changed towards the chip area in the second spiral zone 4, and the synergism effect of utilization and centrifugal force makes smear metal disperse to the outside of tool body 1, wherein, the helical angle in described the first spiral zone 3 is set as the first pitch angle alpha will
1, the helical angle in described the second spiral zone 4 is set as the second pitch angle alpha will
2, can prevent also that in this thereby the coiling of smear metal from making the anti-of instrument lose life-span length and stablize.
In the first pitch angle alpha will
1With the second pitch angle alpha will
2Between 5 ° of differential seat angle less thaies the time, the effect that the discharge direction of smear metal changes can be reduced, based on the variation of helical angle and the effect that smear metal is dispersed to the outside of tool body 1 also can be reduced.In addition, if the second pitch angle alpha will
2Greater than 65 °, the rigidity of the base end part of tool body 1 reduces, thereby can make the anti-property the lost deterioration of instrument.
More preferably, can be with the first pitch angle alpha will
1With the second pitch angle alpha will
2Between differential seat angle be set as more than 10 °, and with the second pitch angle alpha will
2Be set between 45 °～60 °.In the present embodiment, with the second pitch angle alpha will
2Be set as and the first pitch angle alpha will
1(38 °) differ the differential seat angle of 17 °, namely are set as 55 °.
In addition,, for smear metal is discharged well, preferably make chip area in tool tip side direction the second pitch angle alpha will as far as possible
2Change, but generally speaking, the drill bit of using due to PCB will carry out grind and revise to end and then use (grinding) again after use, therefore, consider amount of grinding, preferably the connection setting unit 5 between the 3 and second spiral zone 4, the first spiral zone is set in the Distance tool end more than or equal to 0.2mm and less than or equal to 50% the position of the flute length l of chip area.
In the present embodiment, with the first pitch angle alpha will
1With the second pitch angle alpha will
2Between change point (connect setting unit 5) be set in 20.8% the position (C1) that the Distance tool end is flute length l.
The present invention invents as the drill bit that is coated with the lubricity overlay film such as noncrystal carbon overlay film of use in the Drilling operation etc. that is cut material in non-ferrous metal classes such as PCB, base material as drill bit of the present invention, the superhard alloy that forms due to the hard particles by take WC as main component and the bond material take Co as main component is the material that can obtain the balance between hardness and toughness, and therefore described superhard alloy is preferred.
, if the average grain diameter of WC particle is too small, is difficult to make the WC particle dispersed in bond material, thereby causes that easily the fracture resistence force of superhard alloy reduces.On the other hand,, if the WC particle is excessive, can make the lower hardness of superhard alloy.In addition, if the content of Co is very few, the fracture resistence force of superhard alloy is reduced, on the contrary,, if the content of Co is too much, can make the lower hardness of superhard alloy.Therefore, preferably take the average grain diameter of WC particle as 0.1 μ m～2 μ m, Co content, using % by weight counts 5%～15% superhard alloy as base material.
In addition, for the hard-cutting materials such as PCB are not occurred the stable Drilling operation that overlay film is peeled off, the preferred close property that further improves between base material and noncrystal carbon overlay film.Following metal or semimetal are close to base material ground film forming on this base material as counterdie, and form noncrystal carbon overlay film on this counterdie, wherein said metal or semimetal consist of the one kind or two or more element of selecting 4a family, 5a family, 6a family element and Si from periodic table of elements such as Ti, Cr, Ta, can further improve thus the close property between base material and noncrystal carbon overlay film.In addition, also following compound can be close to base material ground film forming on this base material as counterdie, the compound that described compound is the one kind or two or more element selected 4a family, 5a family, 6a family and Si from the periodic table of elements, form with the element chemical combination more than a kind of selecting from nitrogen and carbon.
Because counterdie is that to improve adherence between base material and noncrystal carbon overlay film be purpose and parts that film forming goes out, if the therefore blocked up meaning that also can lose of counterdie preferably makes thickness more than or equal to 1nm and less than or equal to 200nm.
Because the present embodiment forms as described above, so pass through to cover at chip area at least the lubricity overlay films such as noncrystal carbon overlay film, the surface lubrication raising of chip area, therefore, it is large that the angle of shear of the smear metal that produces in Drilling operation becomes, and smear metal becomes and Bao Youchang, and, because the surface lubrication of chip area is high, so the easily base end part of 1 (the blade C in Fig. 1) discharge along chip area to tool body of smear metal has correspondingly prevented the obstruction of smear metal and made instrument be difficult to lose.
In addition, by reducing the pitch angle alpha will of tool tip
1And α
3, can prevent that smear metal from becoming thin long, thereby make smear metal become not only thick but also short and be difficult to be wound on tool body 1, and then can guarantee the angle of wedge (sword object angle) of larger cutting edge, therefore can prevent the tipping of cutting edge, thereby improve position, hole precision, and make instrument be difficult to lose.
In addition, by increasing the pitch angle alpha will of instrument base end side
2The chip discharge raising of the base end side of chip area 2, the anti-property the lost raising of instrument, and, the discharge direction of the smear metal of discharging swimmingly along chip area 2 is changed, and the synergism effect of utilization and centrifugal force makes smear metal disperse to the outside of tool body 1, prevent the coiling of smear metal, thereby make instrument anti-to lose the life-span elongated, and can realize stable Drilling operation.
In addition, when the smear metal that results from tool tip section with Drilling operation the time is discharged along chip area, collide each other in the fluidic junction 6 that major trough 2a and secondary groove 2b converge mutually by making smear metal, and the ladder of the fluidic junction 6 of converging mutually by major trough 2a and secondary groove 2b differs from 7, therefore make smear metal in fluidic junction 6 (to instrument radially) thereby disperse forcibly to be difficult to arrive the instrument base end part, prevented that smear metal from reeling at the instrument base end part.
Therefore, the present embodiment forms following such boring bar tool: even in the time using as cover plate with the aluminium sheet of resin, instrument also is difficult to lose and chip discharge improves tremendously, thereby can prevent the coiling of smear metal, even diameter 0.7mm is following, the following small diameter drill bit of 0.4mm particularly, it is anti-, and to lose the life-span also very long, can realize stable Drilling operation, and have very outstanding practicality.
The experimental example of effect to proof the present embodiment describes.
Fig. 7 is form and the curve map that the experimental result that position, the hole precision when utilizing major trough 2a to carry out Drilling operation for the different drill bit of groove depth Y of fixing groove depth X and secondary groove 2b estimates is shown.For the drill bit that uses in this experiment, making tool diameter is 0.075mm, making (major trough) flute length l is 1.2mm, comparative example 1 is the drill bit (helical angle of 2 chip areas is all constant is 45 °) of 2 sword 2 groove shape in the past, in comparative example 2 (in the fluidic junction that major trough and secondary groove converge mutually, there is no the poor example of ladder), embodiment 1 and embodiment 2, make the pitch angle alpha will of major trough 2a
1And α
2Be respectively 38 ° and 55 ° and make the pitch angle alpha will of secondary groove 2b
3Constant is 38 °, and in addition, making the specifications except the groove depth Y of secondary groove 2b such as core thick (heart is thick) and drill point angle (tip angle) is identical value.In addition, all set the groove depth Y of the secondary groove 2b of embodiment 1 and embodiment 2 more shallow than the groove depth X of major trough 2a.In addition, be coated with noncrystal carbon overlay film (DLC) at tool body 1.
In this experiment, 5 PCB as the semiconductor-sealing-purpose of hard-cutting material (substrate: thickness is that 0.1mm/ surface and the back side are the Cu layer) are overlapping, and to have placed thickness at the upper surface of overlapping PCB be that the aluminium sheet with resin of 0.1mm is as cover plate,, in order to carry out through hole processing, the thickness that uses as the backing plate paper phenol parts as 1.5mm have been configured generally at the lower surface of described PCB.In addition, making the rotating speed of drill bit (main shaft) is 300krpm, and making feed speed is 1.8m/min, and making and setting number of drills (ヒ Star ト number) is 10000 times (hit).
According to Fig. 7 and Fig. 8, comparative example 1, in the rear half stage in the life-span of drill bit, significant smear metal has occurred reels, and has confirmed the falling of smear metal of the scratch of reeling and coiling at the approaching side of cover plate.And can confirm, its surface of approaching side at cover plate forms concavo-convex, makes the incision deterioration of drill bit, and makes drill bit be easy to bending.On the other hand, confirm according to Fig. 7 and Figure 10, in embodiment 1 and embodiment 2, owing at instrument base end side chip area, forming 1, therefore the rigidity of instrument base end side is high, can not produce such problem, and drill bit is difficult to bending, and the dark value of the depth difference (ladder is poor) between major trough and secondary groove/major trough, less than 70%, can confirm the improvement of position, hole precision.In addition, can also confirm: if the value of the depth difference (ladder is poor) between major trough and secondary groove/major trough degree of depth surpasses 70%, position, hole precision worsens.In addition, according to Fig. 8～Figure 10, the coiling amount of smear metal tails off successively according to the order of comparative example 1, comparative example 2 and embodiment 1, although do not illustrate, the coiling amount that can confirm embodiment 2 equates with embodiment 1.Therefore, according to the present embodiment, can confirm, the anti-roll of comparing smear metal with existing drill bit (comparative example 1) is improved around property.
Claims (15)
1. boring bar tool, its end at tool body (1) is provided with one or more cutting edges, periphery at this tool body (1) is provided with from the spiral helicine a plurality of chip areas of tool tip towards base end side, these a plurality of chip areas comprise 1 major trough (2a) and 1 secondary groove (2b) at least, and being arranged to one or more secondary grooves (2b) converges at middle part and the described major trough (2a) of described major trough (2a), described boring bar tool is characterised in that
The fluidic junction (6) of converging at described major trough (2a) and described secondary groove (2b) is provided with ladder poor (7), and described ladder poor (7) is more than or equal to 2 μ m.
2. boring bar tool according to claim 1, is characterized in that,
Described ladder poor (7) is by making different formation of groove depth of described major trough (2a) and described secondary groove (2b).
3. boring bar tool according to claim 1, is characterized in that,
Described ladder poor (7) is less than or equal to 70% of major trough (2a) groove depth.
4. boring bar tool according to claim 2, is characterized in that,
Described ladder poor (7) is less than or equal to 70% of major trough (2a) groove depth.
5. the described boring bar tool of any one according to claim 1～4, is characterized in that,
Helical angle by making described major trough (2a) or described secondary groove (2b), with different at the instrument base end side, converges described major trough (2a) and described secondary groove (2b) in the tool tip side.
6. the described boring bar tool of any one according to claim 1～4, is characterized in that,
Described fluidic junction (6) is arranged at 50% the position of the Distance tool end less than or equal to the flute length (l) of described major trough.
7. boring bar tool according to claim 5, is characterized in that,
Described fluidic junction (6) is arranged at 50% the position of the Distance tool end less than or equal to the flute length (l) of described major trough (2a).
8. boring bar tool according to claim 6, is characterized in that,
Described boring bar tool is coated with the lubricity overlay film.
9. boring bar tool according to claim 7, is characterized in that,
Described boring bar tool is coated with the lubricity overlay film.
10. boring bar tool according to claim 8, is characterized in that,
Adopt noncrystal carbon overlay film as described lubricity overlay film.
11. boring bar tool according to claim 9, is characterized in that,
Adopt noncrystal carbon overlay film as described lubricity overlay film.
12. boring bar tool according to claim 10, is characterized in that,
The diameter of instrument is less than or equal to 0.7mm.
13. boring bar tool according to claim 11, is characterized in that,
The diameter of instrument is less than or equal to 0.7mm.
14. boring bar tool according to claim 10, is characterized in that,
The diameter of instrument is less than or equal to 0.4mm.
15. boring bar tool according to claim 11, is characterized in that,
The diameter of instrument is less than or equal to 0.4mm.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2010-149154 | 2010-06-30 | ||
| JP2010149154A JP5066229B2 (en) | 2010-06-30 | 2010-06-30 | Drilling tool |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102310215A CN102310215A (en) | 2012-01-11 |
| CN102310215B true CN102310215B (en) | 2013-11-13 |
Family
ID=45424000
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011101403311A Active CN102310215B (en) | 2010-06-30 | 2011-05-27 | Drilling tool |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JP5066229B2 (en) |
| KR (1) | KR20120002447A (en) |
| CN (1) | CN102310215B (en) |
| TW (1) | TWI438047B (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5140142B2 (en) * | 2010-11-22 | 2013-02-06 | ユニオンツール株式会社 | Drilling tool |
| JP5474227B2 (en) | 2013-02-28 | 2014-04-16 | ユニオンツール株式会社 | Drilling tool |
| CN105451918B (en) * | 2013-08-26 | 2018-08-14 | 京瓷株式会社 | Drill bit and used the drill bit machined object manufacturing method |
| JP5873532B2 (en) | 2014-07-08 | 2016-03-01 | ユニオンツール株式会社 | Drilling tool |
| CN104999176B (en) * | 2014-08-15 | 2019-06-25 | 上海精韧激光科技有限公司 | The processing method of cutting edge |
| JP6569918B2 (en) * | 2017-02-28 | 2019-09-04 | 株式会社タンガロイ | Body |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5704740A (en) * | 1995-06-26 | 1998-01-06 | Walter Ag | Drilling tool, particularly for metallic materials |
| CN101428354A (en) * | 2007-11-08 | 2009-05-13 | 佑能工具株式会社 | Drilling tool |
| CN101791717A (en) * | 2010-03-22 | 2010-08-04 | 深圳市金洲精工科技股份有限公司 | Minitype drill bit and processing method thereof |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3164479B2 (en) * | 1994-11-01 | 2001-05-08 | 兼房株式会社 | Rotary drilling tool |
| JP4048709B2 (en) * | 2000-11-09 | 2008-02-20 | 三菱マテリアル株式会社 | Drill |
| JP4239414B2 (en) * | 2001-01-10 | 2009-03-18 | 三菱マテリアル株式会社 | Drill |
| JP2006218589A (en) * | 2005-02-14 | 2006-08-24 | Hitachi Tool Engineering Ltd | Amorphous carbon film coated member |
| JP2007307642A (en) * | 2006-05-17 | 2007-11-29 | Sumitomo Electric Hardmetal Corp | Drill |
-
2010
- 2010-06-30 JP JP2010149154A patent/JP5066229B2/en active Active
-
2011
- 2011-04-20 TW TW100113737A patent/TWI438047B/en active
- 2011-05-27 CN CN2011101403311A patent/CN102310215B/en active Active
- 2011-06-23 KR KR1020110061189A patent/KR20120002447A/en not_active Application Discontinuation
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5704740A (en) * | 1995-06-26 | 1998-01-06 | Walter Ag | Drilling tool, particularly for metallic materials |
| CN101428354A (en) * | 2007-11-08 | 2009-05-13 | 佑能工具株式会社 | Drilling tool |
| CN101791717A (en) * | 2010-03-22 | 2010-08-04 | 深圳市金洲精工科技股份有限公司 | Minitype drill bit and processing method thereof |
Non-Patent Citations (2)
| Title |
|---|
| JP特开2002-205213A 2002.07.23 |
| JP特开2007-307642A 2007.11.29 |
Also Published As
| Publication number | Publication date |
|---|---|
| TW201206595A (en) | 2012-02-16 |
| TWI438047B (en) | 2014-05-21 |
| JP2012011489A (en) | 2012-01-19 |
| KR20120002447A (en) | 2012-01-05 |
| CN102310215A (en) | 2012-01-11 |
| JP5066229B2 (en) | 2012-11-07 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102476209B (en) | Drilling tool | |
| CN102310215B (en) | Drilling tool | |
| JP4897836B2 (en) | Drill insert and drill, and work material cutting method | |
| US20150093207A1 (en) | Deep hole drill tool | |
| CN102198533B (en) | Perforating tool | |
| US10357832B2 (en) | Drill and method for manufacturing machined product using same | |
| EP3263253B1 (en) | Insert, drill, and method of manufacturing cut workpiece employing same | |
| AU3111301A (en) | Cutting tools and drill inserts with chip control geometry | |
| TWI577471B (en) | Drilling tools | |
| CN109963675B (en) | Drilling tool device and method for manufacturing same | |
| JP2014213414A (en) | Drilling tool | |
| CN111093871A (en) | Drill bit | |
| CN102205436A (en) | Perforating tool | |
| CN108349020B (en) | Drill and method for manufacturing cut product | |
| JP2004090150A (en) | Surface cover cutting tool | |
| CN111112697B (en) | Tapping tool and method for manufacturing the same | |
| US20230173594A1 (en) | Drill and method for manufacturing machined product | |
| CN115135440B (en) | End mill and method for manufacturing cut product | |
| JP4135314B2 (en) | Drill | |
| JP3539227B2 (en) | Drilling tool | |
| JP2001018106A (en) | Boring tool | |
| CN110234453B (en) | Cutting insert, drill, and method for manufacturing cut product | |
| JPH08290319A (en) | High speed cutting ball end mill | |
| CN118055821A (en) | Circular saw blade | |
| CN114072249A (en) | Rotary tool and method for manufacturing cut product |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |