CN103970995B - Drill bit for CFRP machining and experimental determining method for structural parameters of drill bit - Google Patents
Drill bit for CFRP machining and experimental determining method for structural parameters of drill bit Download PDFInfo
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Abstract
The invention discloses an experimental determining method for structural parameters of a drill bit for CFRP machining. The method includes the steps of obtaining the distribution of cutting force and cutting temperature on a main cutting edge of the drill bit through a cutting experiment of prefabricated holes of different diameters, obtaining the function relationship between the cutting force, the cutting temperature and the structural parameters of the drill bit through an orthogonal free cutting experiment of CFRP, determining distribution parameter values of the angle of the rear corner of the drill bit and the radius of a blunt circle along the main cutting edge by the utilization of the known angle of a front corner of the drill bit according to the principle of the even distribution of the cutting force and the cutting temperature, and manufacturing the drill bit according to the determined parameter values. According to the drill bit for CFRP machining, in the actual production process of the CFRP, the cutting force and cutting temperature on the main cutting edge are evenly distributed, and drilling defects are reduced.
Description
Technical field
The present invention relates to a kind of drilling tool is and in particular to one kind is processed for carbon fibre reinforced composite (CFRP)
Drill bit, and the experimental methods of its structural parameters are determined based on drill thrust and drilling temperature control, belong to Machining Technology
Field.
Background technology
Carbon fibre reinforced composite (Carbon Fiber Reinforced Polymer, abbreviation CFRP) is a kind of new
The polymer matrix composites with carbon or graphite fibre as reinforcement of type, because having, intensity is high, specific stiffness is high, fatigue performance is good
And designability strong the advantages of, its be widely used in manufacture Advanced Aircraft on main force support structure part, such as aircraft skin, wall
The parts such as plate, wing intermediate beam, fuselage bulkhead and hatch door.In the machine cut of CFRP is processed, drilling is using most, application
A kind of processing mode the widest, the quality of drilling drilling quality is directly connected to assembling quality and the service life of whole aircraft.
The features such as due to distinctive anisotropy and interlayer contact low intensity, CFRP becomes a kind of typical difficult-to-machine material.?
In CFRP boring procedure, except producing the common defect of traditional metal material drilling, (scale error in hole, circularity are by mistake for its drilling
Difference, site error, error of perpendicularity etc.) outside, also can produce the distinctive defect of composite, be mainly shown as：Entrance is peeled off
Layering, outlet layering, interlaminar delamination, tear and burr, the extraction of hole perimeter surface fiber etc., wherein delamination damage is topmost system
Hole defect.According to statistics, in last assembling, that causes because boring is layered scraps up to more than 60% to aircraft.
The boring layering of CFRP layer plywood is the material layer and layer being caused by drilling axial force is excessive and drilling temperature is too high
Between separation, therefore in the drilling process of CFRP layer plywood, particularly heavy is just seemed to the control of drill thrust and drilling temperature
Will.And drill thrust and drilling temperature have 60% impact deriving from cutter geometry in machining, therefore, for composite
The special drilling tool of fabrication design be a kind of effective ways controlling drilling quality.At present, used in numerous composites
Drill bit be by cylindrical turning point increase cut staple sharp cutting edge method, to reduce in multiple material drilling process produce
Setation thorn and layering.But such structure often only optimizes this very small region of cylindrical turning point to the shadow in drilling process
Ring, global optimization effect is simultaneously inconspicuous.
Through the retrieval to existing document, find no pass carbon fibre reinforced composite Special drill cutter structure so far
The open report of determination method for parameter.
Content of the invention
The purpose of the present invention is to overcome the deficiencies in the prior art, provides a kind of drill bit for CFRP processing and its structure ginseng
The Experimental Determination Method of number, obtains basic data by experiment, sets up the distributed mode of cutting force and cutting temperature on main cutting edge
Type, optimizes the relief angles of cutter and blunt round radius accordingly, with the purpose reaching cutting force and cutting temperature is evenly distributed, thus
Reduce the generation of drilling drilling mass defect.
The technical scheme that the present invention solves its technical problem is：
A kind of Experimental Determination Method of the structural parameters of the drill bit for CFRP processing, by the brill of different-diameter pre-manufactured hole
Cut experiment obtain drill bit main cutting edge on cutting force and cutting temperature distribution, by carbon fibre reinforced composite orthogonal from
Obtain the ratio of the cutting force and cutting temperature radius value with measuring point on drill bit main cutting edge and drill bit radius by cutting experiment
Between polynomial function relation, and obtain cutting force and cutting temperature and drill bit anterior angle angle, drill bit back angle angle and brill
Multiple quadratic function relation between head blunt round radius, using known drill bit anterior angle angle, according to cutting force and cutting temperature
The principle being evenly distributed, determines the parameter values that described drill bit back angle angle and blunt round radius are distributed along main cutting edge, according to true
Fixed parameter values prepare described drill bit.
Further, described Experimental Determination Method includes step in detail below：
The first step, on the laminate of carbon fibre reinforced composite, setting diameter with unit length is incremented by step by step one is
The pre-manufactured hole of row, carries out boring experiment on each pre-manufactured hole using selected drill bit, and measures and record the main cutting of described drill bit
The cutting force producing on sword and cutting temperature, no carry out boring experiment using same drill bit at pre-manufactured hole on described laminate,
And measure and the cutting force producing and cutting temperature recorded on the main cutting edge of described drill bit, by data processing by cutting force and
Cutting temperature is following polynomial function along the fitting of distribution of described drill bit main cutting edge：
F (x)=a1x3+b1x2+c1x+d1, formula (4),
T (x)=a2x3+b2x2+c2x+d2, formula (5)；
Second step, enterprising in carbon fibre reinforced composite using the drill bit with different anterior angles, relief angle and blunt round radius
The orthogonal experiment of row free cutting, each factor is respectively adopted 5 levels, measures and record the main cutting of each drill bit in an experiment
The cutting force producing on sword and cutting temperature, by data processing by between cutting force and cutting temperature and each structural parameters of drill bit
Relation fit to following multiple quadratic function：
Fγ,α=a3γ2+b3γ+c3α2+d3α+e3, formula (6),
3rd step, according to the formula (4) being obtained by the first step and formula (5), the formula (6) being obtained by second step and formula (7) and
Front angular distribution function γ (x) of known described drill bit, redistributes the cutting on main cutting edge according to the principle being evenly distributed
Power and cutting temperature, so that it is determined that drill bit back angle angle as described below and blunt round radius are along the distribution function of main cutting edge, and according to
This relief angles of calculating and blunt round radius parameter concrete numerical value：
In above-mentioned formula (2), formula (3), formula (4), formula (5), formula (6) and formula (7),
F is cutting force, and T is cutting temperature, and R is drill bit radius, and r is the radius value of measuring point on main cutting edge,
γ is drill bit anterior angle angle, and α is drill bit back angle angle, R0For drill bit blunt round radius,
a1、b1、c1、d1、a2、b2、c2、d2、a3、b3、c3、d3、e3、a4、b4、c4、d4、e4、f4、g4For matching gained constant；
γ (x) is the function that is distributed along main cutting edge of anterior angle of known described drill bit；
4th step, the design parameter numerical value sharpening of the relief angles being obtained according to the 3rd step and blunt round radius prepares described brill
Head.
Further, described γ (x) is by being measured from.
Further, described drill bit is fluted drill, and described γ (x) is known function as follows：
Wherein, β is the helical angle of drill bit,For the original sharp angle of drill bit, r0Thick for drill core half, k is constant.
Another technical scheme of the present invention is：
The parameter values that a kind of drill bit for CFRP processing, its relief angles and blunt round radius are distributed along main cutting edge are adopted
It is determined with above-mentioned Experimental Determination Method, meet following relational expression：
F (x)=a1x3+b1x2+c1x+d1, formula (4),
T (x)=a2x3+b2x2+c2x+d2, formula (5),
F γ, α=a3γ2+b3γ+c3α2+d3α+e3, formula (6),
Wherein,F is cutting force, and T is cutting temperature, and R is drill bit radius, and r is half of measuring point on main cutting edge
Footpath is worth,
γ is drill bit anterior angle angle, and α is drill bit back angle angle, R0For drill bit blunt round radius,
a1、b1、c1、d1、a2、b2、c2、d2Matching gained constant after testing for the said method first step,
a3、b3、c3、d3、e3、a4、b4、c4、d4、e4、f4、g4For matching gained constant after the experiment of said method second step；
γ (x) is the function that is distributed along main cutting edge of anterior angle of known described drill bit.
Further, described γ (x) is by being measured from.
Further, described drill bit is fluted drill.
Further, described γ (x) is known function as follows：
Wherein, β is the helical angle of drill bit,For the original sharp angle of drill bit, r0Thick for drill core half, k is constant.
Compared with prior art, present invention has the advantages that：Due to based on cutting force and cutting temperature average mark in processing
The principle joined, in the case of known to tool orthogonal rake angle parameter, is combined by basic experiment method data matching, determines
Go out tool clearance angle and blunt round radius along the parameter distribution numerical value of main cutting edge, so that the drill bit manufacturing accordingly is in carbon fiber
Strengthen in the reality processing of composite (CFRP), reach cutting force and cutting temperature is evenly distributed, reduce the product of drilling defects
Raw.
Brief description
The schematic diagram of different-diameter pre-manufactured hole in Fig. 1 first step of the present invention.
Fig. 2 first step of the present invention gained cutting force and cutting temperature are along the distribution schematic diagram of main cutting edge.
The cutter structure schematic diagram of Fig. 3 present invention.
In Fig. 4 present invention, anterior angle angle, relief angles and blunt round radius are along the change schematic diagram of main cutting edge.
Fig. 5 is the partial enlarged drawing of main cutting edge in Fig. 3.
Specific embodiment
The present invention is based on infrastest data, sets up the distributed model of cutting force and cutting temperature on main cutting edge, and with
It is evenly distributed cutting force and the cutting temperature redistributing on main sword for principle, so that it is determined that the relief angles of drill bit and cutter are blunt
Radius of circle, obtains the higher multiple material drilling cutters of drilling quality.
The invention provides a kind of Experimental Determination Method of the structural parameters of the drill bit for CFRP processing, by different straight
The drilling test of footpath pre-manufactured hole obtains cutting force and cutting temperature distribution on drill bit main cutting edge, is combined by fibre reinforced
The orthogonal free cutting experiment of material obtains the functional relationship between cutting force and cutting temperature and each structural parameters of drill bit, utilizes
Known drill bit anterior angle angle, the principle being evenly distributed according to cutting force and cutting temperature, determine described drill bit back angle angle and
The parameter values that blunt round radius are distributed along main cutting edge, the parameter values according to determining prepare described drill bit.
Experimental Determination Method of the present invention includes step in detail below：
The first step, carries out carbon-fiber-reinforcomposite composite material layer plywood drilling using non-reconditioning or through the drill bit of special reconditioning
Experiment, experiment is adopted and is carried out with the following method：On CFRP layer plywood prefabricated a diameter of 1mm, 2mm, 3mm, 4mm, 5mm, 6mm,
A series of pre-manufactured hole being incremented by step by step with unit length such as 7mm, 8mm, as shown in Figure 1.Same in each pre-manufactured hole using selected drill bit
One position carries out boring experiment, and measures the cutting force producing on the main cutting edge of described drill bit and cutting temperature in an experiment,
It is recorded as F1, F2, F3, F4, F5, F6, F7, F8 and T1, T2, T3, T4, T5, T6, T7, T8 respectively；And using same drill bit in institute
State on laminate and no to carry out boring experiment at pre-manufactured hole, and measure and the cutting force producing is recorded on the main cutting edge of described drill bit
And cutting temperature, it is recorded as F0 and T0.Calculated single on this drill bit main cutting edge by formula F (n-1)-F (n) and T (n-1)-T (n)
Cutting force and cutting temperature that bit length (1mm) produces, obtain cutting force and cutting temperature on main cutting edge as shown in Figure 2
Distribution curve.By way of data processing, the cutting force on drill bit main cutting edge and cutting temperature distribution are reduced to respectively
Polynomial functional relationship, by the method for fitting of a polynomial, obtains following polynomial function：
F (x)=a1x3+b1x2+c1x+d1, formula (4),
T (x)=a2x3+b2x2+c2x+d2, formula (5),
Wherein,F is cutting force, and T is cutting temperature, and R is drill bit radius, and r is half of measuring point on main cutting edge
Footpath is worth, a1、b1、c1、d1、a2、b2、c2、d2For matching gained constant.
Second step, carries out the orthogonal reality of free cutting of CFRP using the drill bit with different anterior angles, relief angle and blunt round radius
Test, experiment adopts orthogonal experimental method, and each factor is respectively adopted 5 levels, measures and record the master of each drill bit in an experiment
The cutting force producing on cutting edge and cutting temperature, and by the way of data processing, by cutting force and cutting temperature and drill bit
Relation between each structural parameters fits to following multiple quadratic function：
F γ, α=a3γ2+b3γ+c3α2+d3α+e3, formula (6),
Wherein, F is cutting force, and T is cutting temperature, and γ is drill bit anterior angle angle, and α is drill bit back angle angle, R0For drill bit
Blunt round radius, a3、b3、c3、d3、e3、a4、b4、c4、d4、e4、f4、g4For matching gained constant.
3rd step, using drill bit anterior angle as benchmark, determines relief angles and the blunt round radius of drill bit.
If drill bit is fluted drill, its anterior angle is changing always along main cutting edge, and by cutter helical angle, original cutting edge of a knife or a sword
The parameters such as angle, drill core thickness determine, often it has been determined that and not malleable after cutter molding.Therefore, before according to fluted drill
The traditional calculating formula at angle：
Wherein, β is the helical angle of drill bit,For the original sharp angle of drill bit, r0Thick for drill core half, k is constant.
Described γ (x) can also be by being measured from.
γ (x) is substituted into formula (6), F can be obtainedγ,α(x)=a3γ(x)2+b3γ(x)+c3α2+d3α+e3.
It is believed that the hole of the same depth of the same diameter of drilling needs to consume same work(, produce an equal amount of average
Cutting force.Therefore formula (4) can be passed through, according to equally distributed principle, redistribute cutting force
And be defined below described drill bit back angle angle along the distribution function of main cutting edge, and according to this relief angles of calculating ginseng
The concrete numerical value of number：
Wherein, γ (x) is as shown in formula (1), or by being measured from.
Again γ (x) and α (x) is substituted into formula (7), obtain
It is believed that the hole of the same depth of the same diameter of drilling, produce heat as much, cause same temperature rise, because
This can pass through formula (5), according to equally distributed principle, redistributes cutting temperature
And be defined below described drill bit blunt round radius along the distribution function of main cutting edge, and according to this blunt round radius of calculating ginseng
The concrete numerical value of number：
Wherein, as shown in formula (1) or by being measured from, α (x) is as shown in formula (2) for γ (x).
4th step, the design parameter numerical value sharpening of the relief angles being obtained according to the 3rd step and blunt round radius prepares described brill
Head.
The parameter that drill bit for CFRP processing of the present invention, its relief angles and blunt round radius are distributed along main cutting edge
Numerical value is determined using above-mentioned Experimental Determination Method, and it meets above-mentioned relation formula formula (2), formula (3), formula (4), formula (5), formula
(6) and formula (7), wherein γ (x) can be by being measured from, and when described drill bit is fluted drill, described γ (x) is as above
State shown in formula (1).
Below in conjunction with accompanying drawing, the invention will be further described, and the present embodiment carries out reality premised on technical solution of the present invention
Apply, give detailed embodiment and specific operating process, but protection scope of the present invention is not limited to following embodiments.
Embodiment
T800CFRP laminate is processed in the hard alloy twist drill drilling adopting a diameter of 12mm in the present embodiment, measures it
On cutting edge, cutting force and cutting temperature distribution are as shown in Figure 2.Experimental data is processed, obtains following fitting formula：
F (x)=11.15x3-12.76x2- 1.02x+10.84,
T (x)=- 37.77x3+44.48x2-10.35x+9.33.
Using cutting speed V=200m/min, cutting depth ap=20 μm is experiment parameter, carries out the orthogonal freedom of CFRP
Cutting experiment, wherein anterior angle adopt 5 °, 10 °, 15 °, 20 ° and 25 ° of five levels, and relief angle adopts 5 °, 10 °, 15 °, 20 ° and 25 °
Five levels, blunt round radius adopt 5 μm, 10 μm, 15 μm, 20 μm and 25 μm of five levels, measurement cutting force and cutting temperature, will
Cutting force and cutting temperature obtain cutting force and the cutting temperature of unit length divided by thickness of slab, then experimental data are intended
Close, obtain relational expression：
Fγ,α=0.004 γ2-0.264γ+0.0008α2- 0.332 α+12.86,
Experiment adopt fluted drill as shown in figure 3, it is structurally characterized in that, the apex point of common fluted drill grinds two right
The inner edge claiming is in order to reduce chisel edge, and weakens the negative rake phenomenon at drill core.Drill bit radius is 6mm, and drill core radius is
0.5mm, original sharp angle is 119.5 °, and helical angle is 30 °, and the anterior angle change function of this drill bit is
Calculated according to formula (2) and during α (x), consider α2The coefficient of item is minimum, gives up this, simplifies result of calculation and obtains
α (x)=0.012 γ (x)2-0.795γ(x)+11.95.
R is calculated according to formula (3)0α is considered when (x)2Xiang HeThe coefficient of item is minimum, and this two are given up, and simplifies and calculates knot
Fruit obtains
R0(x)=0.00233 γ (x)2+0.602γ(x)+10.97.
γ (x), α (x) and R0X the change of () is as shown in Figure 4.
α (x) and R are calculated according to the method for the present embodiment0X () sharpens to the relief angle of this drill bit and blunt circle, obtain
Arrive the dedicated tool for machining composite material, as shown in Figure 5.Although this drill bit can not reduce total cutting force and cutting temperature,
But cutting force and cutting temperature can be made in boring procedure to be evenly distributed on main cutting edge, significantly improve drilling quality,
Decrease the defect producing in boring procedure.
The present invention is not in any way limited to the illustrative embodiments being presented in specification and drawings.Description is retouched
All combinations of the embodiment stated are clearly understood that as falling in the scope of protection of present invention.And, will in such as right
Ask in the scope of the present invention that book summarized, many variations is possible.
Claims (9)
1. a kind of Experimental Determination Method of the structural parameters of the drill bit for CFRP processing it is characterised in that：By different-diameter
The drilling test of pre-manufactured hole obtains cutting force and cutting temperature distribution on drill bit main cutting edge, by carbon fiber reinforced plastic
The orthogonal free cutting experiment of material obtains the radius value of measuring point and drill bit on cutting force and cutting temperature and drill bit main cutting edge
After polynomial function relation between the ratio of radius, and acquisition cutting force and cutting temperature and drill bit anterior angle angle, drill bit
Multiple quadratic function relation between angle angle and drill bit blunt round radius, using known drill bit anterior angle angle, according to cutting force
The principle being evenly distributed with cutting temperature, determines the parameter number that described drill bit back angle angle and blunt round radius are distributed along main cutting edge
Value, the parameter values according to determining prepare described drill bit.
2. the Experimental Determination Method of the structural parameters of the drill bit for CFRP processing according to claim 1, its feature exists
In：Described Experimental Determination Method includes step in detail below：
The first step, on the laminate of carbon fibre reinforced composite setting diameter with unit length step by step be incremented by a series of
Pre-manufactured hole, carries out boring experiment using selected drill bit on each pre-manufactured hole, and measures and record on the main cutting edge of described drill bit
The cutting force producing and cutting temperature, no carry out boring experiment using same drill bit at pre-manufactured hole on described laminate, and survey
Amount and record the cutting force producing on the main cutting edge of described drill bit and cutting temperature, by data processing by cutting force and cutting
Temperature is following polynomial function along the fitting of distribution of described drill bit main cutting edge：
F (x)=a1x3+b1x2+c1x+d1, formula (4),
T (x)=a2x3+b2x2+c2x+d2, formula (5)；
Second step, is carried out certainly using the drill bit with different anterior angles, relief angle and blunt round radius on carbon fibre reinforced composite
By the orthogonal experiment cutting, each factor is respectively adopted 5 levels, measures in an experiment and records on the main cutting edge of each drill bit
The cutting force producing and cutting temperature, by data processing by the pass between cutting force and cutting temperature and each structural parameters of drill bit
System fits to following multiple quadratic function：
F γ, α=a3γ2+b3γ+c3α2+d3α+e3, formula (6),
3rd step, according to the formula (4) being obtained by the first step and formula (5), the formula (6) being obtained by second step and formula (7) and known
Described drill bit front angular distribution function γ (x), the cutting force redistributing on main cutting edge according to the principle that is evenly distributed and
Cutting temperature, so that it is determined that drill bit back angle angle as described below and blunt round radius are along the distribution function of main cutting edge, and according to meter
Calculate this relief angles and the concrete numerical value of blunt round radius parameter：
In above-mentioned formula (2), formula (3), formula (4), formula (5), formula (6) and formula (7),
F is cutting force, and T is cutting temperature, and R is drill bit radius, and r is the radius value of measuring point on main cutting edge,
γ is drill bit anterior angle angle, and α is drill bit back angle angle, R0For drill bit blunt round radius,
a1、b1、c1、d1、a2、b2、c2、d2、a3、b3、c3、d3、e3、a4、b4、c4、d4、e4、f4、g4For matching gained constant；
γ (x) is the function that is distributed along main cutting edge of anterior angle of known described drill bit；
4th step, the design parameter numerical value sharpening of the relief angles being obtained according to the 3rd step and blunt round radius prepares described drill bit.
3. the Experimental Determination Method of the structural parameters of the drill bit for CFRP processing according to claim 2, its feature exists
In：Described γ (x) is by being measured from.
4. the Experimental Determination Method of the structural parameters of the drill bit for CFRP processing according to claim 2, its feature exists
In：Described drill bit is fluted drill.
5. the Experimental Determination Method of the structural parameters of the drill bit for CFRP processing according to claim 4, its feature exists
In：Described γ (x) is known function as follows：
Wherein, β is the helical angle of drill bit,For the original sharp angle of drill bit, r0Thick for drill core half, k is constant.
6. a kind of drill bit for CFRP processing it is characterised in that：The relief angles of described drill bit and blunt round radius are along main cutting
The parameter values of sword distribution are determined using Experimental Determination Method described in claim 2, meet following relational expression：
F (x)=a1x3+b1x2+c1x+d1, formula (4),
T (x)=a2x3+b2x2+c2x+d2, formula (5),
Fγ,α=a3γ2+b3γ+c3α2+d3α+e3, formula (6),
Wherein,
F is cutting force, and T is cutting temperature, and R is drill bit radius, and r is the radius value of measuring point on main cutting edge,
γ is drill bit anterior angle angle, and α is drill bit back angle angle, R0For drill bit blunt round radius,
a1、b1、c1、d1、a2、b2、c2、d2Matching gained constant after testing for claim 2 first step,
a3、b3、c3、d3、e3、a4、b4、c4、d4、e4、f4、g4For matching gained constant after the experiment of claim 2 second step；
γ (x) is the function that is distributed along main cutting edge of anterior angle of known described drill bit.
7. the drill bit for CFRP processing according to claim 6 it is characterised in that：Described γ (x) is by measurement
And obtain.
8. the drill bit for CFRP processing according to claim 6 it is characterised in that：Described drill bit is fluted drill.
9. the drill bit for CFRP processing according to claim 7 it is characterised in that：Described γ (x) is known as follows
Function：
Wherein, β is the helical angle of drill bit,For the original sharp angle of drill bit, r0Thick for drill core half, k is constant.
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| CN104289747A (en) * | 2014-10-27 | 2015-01-21 | 华北水利水电大学 | Optimization method of high-speed drill bit of automobile engine cylinder |
| CN105651200B (en) * | 2016-01-08 | 2017-11-10 | 大连理工大学 | A kind of data decimation method that rounded cutting edge radius calculates |
| CN105719100A (en) * | 2016-02-01 | 2016-06-29 | 西安交通大学 | Method for determining temperature range of high-quality drilling of FRP (Fiber Reinforced Polymer/Plastics) |
| CN108655466B (en) * | 2017-03-31 | 2019-08-30 | 南京理工大学 | A kind of axial force prediction method of ultrasonic vibration auxiliary drilling CFRP |
| CN108132196B (en) * | 2018-01-10 | 2020-05-22 | 南京理工大学 | Axial force prediction method for carbon fiber composite material drilled by rotating and ultrasonic through three-point drill |
| CN108733912B (en) * | 2018-05-17 | 2021-08-03 | 南京理工大学 | Method for predicting height of burrs at outlet of robot rotary ultrasonic drilling CFRP/aluminum alloy laminated structure |
| CN110954048A (en) * | 2019-12-17 | 2020-04-03 | 厦门理工学院 | Method and device for measuring deflection angle of twist drill pair |
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| CN101290638A (en) * | 2008-06-03 | 2008-10-22 | 同济大学 | Method for reverse circulation drill head injector hole and bottom injection hole structural parameter optimization |
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