CN108972169B - Non-coaxial spiral rear cutter face micro drilling cutter and cutter grinding method thereof - Google Patents

Non-coaxial spiral rear cutter face micro drilling cutter and cutter grinding method thereof Download PDF

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CN108972169B
CN108972169B CN201810830245.5A CN201810830245A CN108972169B CN 108972169 B CN108972169 B CN 108972169B CN 201810830245 A CN201810830245 A CN 201810830245A CN 108972169 B CN108972169 B CN 108972169B
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drill
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CN108972169A (en
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王西彬
梁志强
郭海新
周天丰
赵文祥
解丽静
焦黎
刘志兵
颜培
杨洪建
沈文华
滕龙龙
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Beijing Institute of Technology BIT
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B3/00—Sharpening cutting edges, e.g. of tools; Accessories therefor, e.g. for holding the tools
    • B24B3/24—Sharpening cutting edges, e.g. of tools; Accessories therefor, e.g. for holding the tools of drills
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B3/00—Sharpening cutting edges, e.g. of tools; Accessories therefor, e.g. for holding the tools
    • B24B3/24—Sharpening cutting edges, e.g. of tools; Accessories therefor, e.g. for holding the tools of drills
    • B24B3/247—Supports for drills
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B55/00—Safety devices for grinding or polishing machines; Accessories fitted to grinding or polishing machines for keeping tools or parts of the machine in good working condition

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  • Mechanical Engineering (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)

Abstract

The invention discloses a non-coaxial spiral rear cutter face micro-drilling cutter and a cutter grinding method thereof, belonging to the technical field of machining. The structure of the cutter is characterized in that the drill point of the cutter consists of a continuous spiral rear cutter face and an S-shaped chisel edge. The drilling tool realizes accurate numerical control sharpening of the non-coaxial spiral rear tool face through five-axis linkage of X, Y, Z, A, W. The sharpening method can realize the grinding preparation of the non-coaxial spiral face drill point with various geometric structural parameters. And the quadric surface equation of the rear cutter surface is dispersed into a linear equation set of a spiral generating line, the relative spiral motion between the grinding wheel and the cutter is ensured through the motion in a plane parallel to the axis of the drill bit and a plane perpendicular to the axis of the drill bit, the calculation process is efficient and accurate, and the calculation is easy to realize. Aiming at the characteristics of micro deep hole drilling processing of difficult-to-process materials such as stainless steel and the like, the tool not only can effectively reduce the abrasion of the chisel edge, improve the centering performance of drilling, and reduce the roundness error of the inlet of a micro hole; and the friction between the micro drill and the workpiece can be effectively reduced, the drilling force and the abrasion of a rear cutter face are reduced, and the service life of the micro drill is prolonged.

Description

Non-coaxial spiral rear cutter face micro drilling cutter and cutter grinding method thereof
Technical Field
The invention relates to a non-coaxial spiral rear cutter face micro-drilling cutter and a cutter grinding method thereof, belonging to the technical field of machining.
Background
With the rapid development of scientific technology and industrial production, the application of micro-hole parts, such as instrument elements of aerospace inertial gyroscopes, oil nozzles of engines, air film cooling holes of turbine blades, computer printing heads, printed circuit boards, etc., is becoming more widespread. The micro-hole parts are made of difficult-to-process materials such as stainless steel, high-strength steel, titanium alloy and the like, and 1Cr18Ni9Ti stainless steel materials are frequently used for high-temperature and high-pressure parts, engine oil nozzles and the like. The micro-hole machining generally adopts methods such as micro-drilling, micro-electric spark, micro-etching and the like. Wherein, the micro drilling has the advantages of wide machinable materials, no limitation of material conductivity, high material removal rate, high machining precision, low batch production cost and the like, and becomes the main method for machining the micro holes at present at high precision.
In the micro-drilling machining, due to the fact that the stainless steel material is large in plastic deformation and low in heat conductivity coefficient, cutting scraps are not prone to breaking and separating and are prone to winding and accumulating in the spiral groove, and machining surface quality is affected. Meanwhile, the micro drilling process is influenced by the size effect, the material removing process mainly comprises extrusion and plowing, the cutting edge area of the cutter is subjected to large stress, micro tipping and micro cracks are easily caused, and the grinding loss of the cutter is aggravated. And the problems of cutter breakage, low processing efficiency and the like often occur in the sharpening process of the micro-drilling cutter. Aiming at the problems and difficulties of the precision drilling tool for the micro holes made of difficult-to-machine materials such as stainless steel and the like, the invention designs a drill point structure of a novel micro drilling tool and provides a high-quality sharpening preparation method thereof.
Disclosure of Invention
In view of the above, the present invention provides a non-coaxial spiral flank micro drilling tool and a method for sharpening the same. Aiming at the characteristics of micro drilling, the structural characteristics of the tool not only can effectively reduce the abrasion of the chisel edge, improve the centering performance of drilling and reduce the roundness error of the entrance of a micro hole; the friction between the micro drill and the workpiece can be effectively reduced, the drilling force and the abrasion of a rear cutter face are reduced, and the service life of the micro drill is prolonged; and the cutter is subjected to a cutter grinding test, the precise numerical control cutter grinding of the cutter face after micro drilling is finished based on five-axis linkage, and the cutter grinding efficiency and quality are obviously improved.
The technical scheme of the invention is as follows: a non-coaxial spiral rear cutter face micro drilling cutter is characterized in that a drill tip consists of a continuous spiral rear cutter face and an S-shaped chisel edge. The non-coaxial helicoids can be used for enabling the grinding wheel (or the drill bit) to rotate around a certain fixed axis Z when the drill bit (or the grinding wheel) is fixedHThe grinding wheel is obtained by spiral motion (intersecting with the axis of the cutter), but the six-axis numerical control grinding machine cannot directly realize complex space motion of the grinding wheel, and the spiral motion of the grinding wheel needs to be decomposed into a plurality of plane motions of the grinding wheel and the drill bit. In order to realize numerical control sharpening of a non-coaxial spiral surface, the quadric surface equation of a rear cutter surface needs to be dispersed into a linear equation of a contact line AN between a micro drill and a grinding wheel, namely a spiral motion generation line OHM at any position during the spiral motion.
The method can realize the controllability of five grinding parameters (theta, β, B and phi) of a rear cutter face, further can realize the grinding preparation of a non-coaxial spiral surface drill point with various geometric structural parameters, and the sharpening method disperses a quadric surface equation of the rear cutter face into a linear equation set of a spiral generating line, ensures the relative spiral motion between the grinding wheel and the cutter through the motions parallel to the axial plane of the drill bit and in the plane vertical to the axial line of the drill bit, and is easy to calculate the high-efficiency precision, realize the accurate sharpening of the spiral groove and the sharpening processX, Y, Z and W shafts are moved and rotated to the initial positions of spiral groove grinding, and then the U shaft and the A shaft respectively perform interpolation motion of straight line and rotation, namely the rotation angle of the A shaft
Figure BDA0001741721720000021
While the U-axis moves by a distance
Figure BDA0001741721720000022
Wherein d is the diameter of the microdriller, β0The helix angle of the spiral groove. A complete spiral groove is formed through the combined motion of the U shaft and the A shaft.
Has the advantages that:
(1) the non-coaxial helicoid micro-drilling chisel edge is an S-shaped curved edge and is smoother, thereby effectively reducing the abrasion of the chisel edge, improving the centering performance of drilling and reducing the roundness error of the entrance of a micro-hole; and the back angles of the main cutting edge and the cross edge are reasonably distributed, the back angle is larger, the friction between the micro drill and a workpiece is effectively reduced, and the drilling force and the abrasion of a rear cutter face are reduced.
(2) The invention realizes the accurate numerical control blade grinding of the micro-drilling rear blade face of the non-coaxial spiral rear blade face and the blade grinding of the spiral groove by the combined motion of A, U through the five-axis linkage of the numerical control machine tool X, Y, Z, A, W, solves the problem of difficult blade grinding of the micro-drilling cutter of the non-coaxial spiral rear blade face, reduces the phenomena of damage, fracture and the like generated in the grinding process, improves the blade grinding quality of the cutter and prolongs the service life of the cutter.
Drawings
FIG. 1 is a mathematical model of the non-coaxial spiral relief of the present invention;
FIG. 2 is a schematic view of a grinding wheel mounting of the CNC tool grinder;
figure 3 is a schematic diagram of the sharpening process of the flank of a non-coaxial spiral flank micro-drilling tool.
Figure 4 is a schematic diagram of a spiral groove sharpening process for a non-coaxial spiral relief finish micro drilling tool.
Detailed Description
The invention is described in detail below by way of example with reference to the accompanying drawings:
numerical control toolThe schematic view of the installation of the grinding wheel of the grinding machine is shown in fig. 2. The spiral groove sharpening process is completed by adopting a dish-shaped grinding wheel 1, and the rear knife face sharpening process is completed by adopting a parallel grinding wheel 2. Furthermore, LX、LY、LZIs the center O of the drill tipdDistance along axis X, Y, Z from the machine origin O. L isw1、Lw2The distances from the disc grinding wheel 1 and the parallel grinding wheel 2 to the origin O of the machine tool along the Y axis respectively, DW2Parallel to the diameter of the grinding wheel, DW1Is the diameter of the grinding disc.
The mathematical model of the non-coaxial spiral flank is shown in FIG. 1, and the flank F1By the generation line OHM around ZHA part of the helicoid formed by the helical movement of the shaft, OH-XHYHZHIs a helical coordinate system. O isd-XdYdZdFor the micro-drill coordinate system, origin of coordinates OdAt the center of the drill tip, ZdThe axis coinciding with the drill bit axis, XdThe axial direction satisfies that the Y coordinate of the outer edge rotating point C is Yc-t (2t is the core thickness). Micro-drill coordinate system Od-XdYdZdBy winding around ZdThe shaft rotates by an angle β to obtain a transition coordinate system Ot-XtYtZt. Transition coordinate system Ot-XtYtZtBy coordinate translation and rotation about YtThe shaft rotates by a certain angle phi to obtain a spiral coordinate system OH-XHYHZHIn addition to parameters φ and β, there are three sharpening parameters B, H and θ, where B is the center of the drill tip OdDistance to point D, point D being a helical coordinate system OH-XHYHZHZ of (A)HAxis and microdriller coordinate system Od-XdYdZdZ of (A)dThe intersection of the axes, H being the pitch of the helicoids, theta being the grinding face of the grinding wheel and ZHThe angle of the axes.
Micro-drill coordinate system O of non-coaxial helicoid rear cutter facedXdYdZdEquation F in (1)1Comprises the following steps:
Figure BDA0001741721720000031
wherein, Xt＝Xdcosβ-Ydsinβ，Yt＝Ydcosβ+Xdsinβ。
Mixing Xd＝-Xd，Yd＝-YdInto equation F1Obtaining the flank face F2Equation F2(Xd,Yd,Zd)＝0。
The non-coaxial helicoids can be used for enabling the grinding wheel (or the drill bit) to rotate around a certain fixed axis Z when the drill bit (or the grinding wheel) is fixedHThe grinding wheel is obtained by spiral motion (intersecting with the axis of the cutter), but the six-axis numerical control grinding machine cannot directly realize complex space motion of the grinding wheel, and the spiral motion of the grinding wheel needs to be decomposed into a plurality of plane motions of the grinding wheel and the drill bit. In order to realize numerical control sharpening of a non-coaxial spiral surface, the quadric surface equation of a rear cutter surface needs to be dispersed into a linear equation of a contact line AN between a micro drill and a grinding wheel, namely a spiral motion generation line OHM at any position during the spiral motion.
Assuming AN is a certain position of a generating line in the process of spiral motion, and the point N is positioned on a clearance surface F1Line of intersection L with the outer cylindrical surface of the drill bit1In the micro-drill coordinate system Od-XdYdZdThe middle N point coordinates may be expressed as:
Nd(xd,yd,zd)＝(dcosαd/2,dsinαd/2,zd)＝(gx(αd),gy(αd),gz(αd))
wherein d is the microdrilling diameter, αdIs OdProjection of N on cross section of drill bit and XdAngle of axis, zdCan be calculated by the flank equation F1(xd,yd,zd) And solving the solution to obtain the solution of 0.
In a helical coordinate system OH-XHYHZHIn, suppose that line O occursHM around ZHShaft rotation angle αHReaches the position of the straight line AN, so that the point A is at OH-XHYHZHThe expression in the coordinate system is: a. theH(xAH,yAH,zAH)＝(0,0,-HαHAnd/2 pi). Obtaining the point A in the micro-drill coordinate system O through the coordinate conversion relational expressiond-XdYdZdThe expression in (1) is:
Figure BDA0001741721720000041
in addition, N points are in a micro-drilling coordinate system Od-XdYdZdCoordinate of (5) is Nd(xd,yd,zd)＝(dcosαd/2,dsinαd/2,zd) Through the coordinate transformation relational expression, the N point at O can be obtainedH-XHYHZHExpression N in a coordinate systemH(xH,yH,zH) Therefore αHCan be expressed as αH＝tan(yH/xH)＝f(αd). Thus in the microdrilling coordinate system OdXdYdZdIn, the coordinates of point A are Ad(xAd,yAd,zAd)＝(px(f(αd)),py(f(αd)),pz(f(αd)))＝(fx(αd),fy(αd),fz(αd) ). for arbitrary angle αdThe equation of the generating line AN is uniquely determined, so the flank surface quadric equation can be discretized into a linear equation set of a series of contact lines, which equation can be expressed as:
Figure BDA0001741721720000042
the specific method for preparing the non-coaxial spiral rear tool face micro-hole drilling tool by sharpening comprises the following steps:
1. firstly, a cutter blank is clamped on a numerical control grinder fixture for fixing, and a sensor is used for setting a cutter to establish the relation between a workpiece coordinate system and a machine tool coordinate system.
2、The non-coaxial spiral rear face of the micro-drilling tool is sharpened on the basis of the step 1, the sharpening process is shown in the attached figure 3, the relative positions of a drill bit and a grinding wheel in the sharpening process are shown in the figure 3(a), the rear face is sharpened by using the outer cylindrical surface of the parallel grinding wheel, and the contact between the grinding wheel and the drill bit is regarded as line contact. In order to realize numerical control sharpening of the rear cutter face, the contact line position of the grinding wheel and the drill bit is ensured to be a determined generation line L in the sharpening processANPosition, required to obtain the line of occurrence L in the machine coordinate system O-XYZANAnd the coordinates of point N.
In the microdrilling coordinate system Od-XdYdZdIn (f), the direction vector of contact line AN is AN ═ fx(αd)-gx(αd),fy(αd)-gy(αd),fz(αd)-gz(αd)). In the machine tool coordinate system O-XYZ, the orientation needs to be ensured by movements in a plane parallel to the drill axis and in a plane perpendicular to the drill axis. In a plane parallel to the bit axis (see FIG. 3(b)), the W axis needs to be rotated by γ + π/2 to ensure the direction of the contact line, wherein the bit axis Z isdThe angle γ between the axis and AN is:
Figure BDA0001741721720000043
in a plane perpendicular to the bit axis (see FIG. 3(c)), assume OHM is the initial position of the contact line, OHM needs to wind around ZdShaft rotation angle αAAnd moved by a distance Z ═ O along the Z axisdT can reach the line AN position. Point A to drill point OdThe distance of (a) is:
Figure BDA0001741721720000051
therefore, the temperature of the molten metal is controlled,
Figure BDA0001741721720000052
α therein1＝π-β-αd。
During sharpening, the U shaft needs to move a distance B to fix the W shaft rotation center of the machine tool at a point D of the drill bit, and the coordinate position of a point N in a machine tool coordinate system O-XYZ is ensured through the relative distance between the point D and the point N. The relative distance (x, y) between point D and point N is:
Figure BDA0001741721720000053
Figure BDA0001741721720000054
wherein, the passing point N is taken as a parallel line of the axis of the drill bit, the passing point D is taken as a vertical line of the axis of the drill bit, the two are intersected at a point Q,
Figure BDA0001741721720000055
the distance between point D and point Q.
In summary, according to the grinding wheel mounting parameters and the grinding wheel geometry parameters shown in fig. 2, the motion equations of the X, Y, Z, A, W axes are: -LX-DW2/2-x，-LY+LW2+y，-LZ-z，αA，γ+π/2。
3. And (3) starting to sharpen the spiral groove of the non-coaxial spiral rear tool face micro-drilling tool on the basis of the step 2, wherein the sharpening process is shown in the attached figure 4. The relative spiral motion of emery wheel and cutter forms the helicla flute curved surface, and when the emery wheel was fixed, the cutter made spiral motion along self axis, and the overlapping portion of emery wheel and cutter orbit forms the helicla flute.
Before grinding begins, X, Y, Z and W shaft move to rotate to the initial position of spiral groove grinding, the angle of rotation of W shaft is 90-lambda, in this patent, lambda is β0+20°，β0The helix angle of the spiral groove. Z-axis movement distance Z1To ensure that the thickness of the micro-drill core meets the design requirement, z1＝LZ-ax. X, Y the moving distances of the axes are x respectively1、y1To ensure that the center of the drill tip coincides with the center of the large end face of the grinding wheel, wherein x1＝LX+azsinλ+aycosλ，y1＝LY+azcosλ-aysin lambda. During grinding, the U axis and the A axis respectively perform linear and rotary interpolation motion, namely the rotation angle of the A axis
Figure BDA0001741721720000056
While the U-axis moves by a distance
Figure BDA0001741721720000057
Wherein d is the diameter of the microdriller, β0The helix angle of the spiral groove. A complete spiral groove is formed through the combined motion of the U shaft and the A shaft.
In summary, the above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (7)

1. A method for sharpening the superfine drilling tool with non-coaxial spiral back tool surface features that its drill tip is composed of continuous spiral back tool surface and S-shaped cross edge, and the non-coaxial spiral back tool surface of said superfine drilling tool is in the coordinate system of micro drilld-XdYdZdEquation F in (1)1Comprises the following steps:
Figure FDA0002413724310000011
wherein, Xt＝Xdcosβ-Ydsinβ，Yt＝Ydcosβ+Xdsin β, B is the center of the drill tip OdDistance from point D, H is pitch of the helicoid, θ is the grinding surface of the grinding wheel and the helicoid coordinate system OH-XHYHZHZ of (A)HAngle of axes phi being a transition coordinate system Ot-XtYtZtZ of (A)tZ of axis and micro-drill coordinate systemdAngle of axes, β Z of the microdriller coordinate systemdAxis and transition coordinate system Ot-XtYtZtX of (2)dThe included angle of the axes;
it is characterized in that the preparation method is characterized in that,
the sharpening method comprises the step of dispersing a quadric surface equation of a rear tool face into a linear equation of a contact line AN between the micro drill and the grinding wheel, namely a spiral motion generation line OHM, ensuring the relative spiral motion between the grinding wheel and the cutter through the motion in a plane parallel to the axis of the drill bit and a plane vertical to the axis of the drill bit according to the equation of any position in the spiral motion process, wherein the specific method is as follows:
AN is a certain position of a generating line in the process of spiral motion, and the point N is positioned on a rear cutter face F1Line of intersection L with the outer cylindrical surface of the drill bit1In the micro-drill coordinate system OdXdYdZdThe middle N point coordinates may be expressed as:
Nd(xd,yd,zd)＝(dcosαd/2,dsinαd/2,zd)＝(gx(αd),gy(αd),gz(αd))
wherein d is the microdrilling diameter, αdIs OdProjection of N on cross section of drill bit and XdAngle of axis, zdCan be calculated by the flank equation F1(xd,yd,zd) The solution is obtained by solving for 0,
in a helical coordinate system OHXHYHZHIn, generating line OHM around ZHShaft rotation angle αHTo the position of the straight line AN, thereby obtaining the point A at OHXHYHZHThe expression in the coordinate system is:
AH(xAH,yAH,zAH)＝(0,0,-HαH/2π)
obtaining the point A in the micro-drill coordinate system O through the coordinate conversion relational expressiondXdYdZdIs expressed as
Figure FDA0002413724310000012
N point in micro-drill coordinate system OdXdYdZdCoordinate of (5) is Nd(xd,yd,zd)＝(dcosαd/2,dsinαd/2,zd) Through the coordinate transformation relational expression, the N point at O can be obtainedHXHYHZHExpression N in a coordinate systemH(xH,yH,zH) Thus, αHCan be expressed as:
αH＝tan(yH/xH)＝f(αd)
in the microdrilling coordinate system OdXdYdZdIn, the coordinates of point A are
Ad(xAd,yAd,zAd)＝(px(f(αd)),py(f(αd)),pz(f(αd)))＝(fx(αd),fy(αd),fz(αd))
For any angle αdThe equation of the generating line AN is uniquely determined, so the flank surface quadric equation can be discretized into a linear equation set of a series of contact lines, which equation can be expressed as:
Figure FDA0002413724310000021
2. a method of sharpening as defined in claim 1, wherein: the micro-drilling tool adopts a disc-shaped grinding wheel to finish the sharpening process of the spiral groove, and adopts a parallel grinding wheel outer cylindrical surface to finish the sharpening process of the rear tool face.
3. A method of sharpening as defined in claim 1 or 2 wherein the micro-drilling tool is clamped in the a axis and there are four motions in total during sharpening, rotational motion about the a and W axes and linear motion along the U and Y axes, and the grinding wheel has three motions, linear motion along the Z and X axes and rotational motion about the grinding wheel axis.
4. The sharpening method according to claim 3, wherein in the sharpening process of the rear face, firstly, the U shaft needs to move a distance B to position the W shaft rotation center of the machine tool at a D point of the drill bit, so that the accurate positioning of the drill point center is realized; then accurate numerical control sharpening of the micro-drilling rear tool face is realized through five-axis linkage of X, Y, Z, A, W, and motion equations of X, Y, Z, A, W shafts are respectively as follows: -LX-DW2/2-x，-LY+LW2+y，-LZ-z，αAγ + π/2, wherein LX、LY、LZIs the center O of the drill tipdDistance, L, from machine origin O along axis X, Y, Zw2Is the distance of the parallel grinding wheel from the origin O of the machine tool along the Z axis, DW2In a plane perpendicular to the axis of the bit, for parallel grinding wheel diameters, a line O of helical motionHM forms AN angle of α with contact line ANA(ii) a In a plane parallel to the drill bit axis ZdThe angle between the axis and the contact line AN is gamma,
Figure FDA0002413724310000022
Figure FDA0002413724310000023
from point A to point OdThe distance of (a) to (b),
Figure FDA0002413724310000024
Figure FDA0002413724310000025
b is D to point OdZ is a distance ofdIs NdZ coordinate value of (2) can pass through the flank face F1The solution is obtained by solving the above-mentioned problems,
Figure FDA0002413724310000026
the distance between point D and point Q.
5. According to claim 4The sharpening method is characterized in that in the sharpening process of the spiral groove, the micro drilling tool firstly moves and rotates to the initial grinding position of the spiral groove through X, Y, Z and a W shaft, and then a U shaft and an A shaft respectively perform linear and rotary interpolation motion, namely the rotation angle of the A shaft
Figure FDA0002413724310000027
While the U-axis moves by a distance
Figure FDA0002413724310000028
Wherein d is the diameter of the microdriller, β0The spiral angle of the spiral groove is formed by the combined motion of the U axis and the A axis.
6. The method of sharpening according to claim 5 wherein the W-axis is rotated counterclockwise by an angle λ prior to grinding the spiral groove, wherein λ is β0+20°，β0The helical angle of the spiral groove and the Z-axis moving distance Z1To ensure that the thickness of the drill core of the micro-drilling tool meets the design requirement, z1＝LZ-DW12-t, 2t is the core thickness of the micro-drilling tool, and the X, Y axis moving distance is x respectively1、y1To ensure that the center of the drill tip coincides with the center of the large end face of the grinding wheel, wherein x1＝LX，y1＝LY-Lw1。
7. The sharpening method according to claim 1 or 2, wherein the sharpening method can realize controllability of five grinding parameters theta, β, phi, B and H of a rear face, and further can realize grinding preparation of non-coaxial helicoidal drilling points with various geometric structural parameters.
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