CN119525548A - A small-diameter intermittent deep hole processing technology - Google Patents

A small-diameter intermittent deep hole processing technology Download PDF

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Publication number
CN119525548A
CN119525548A CN202411889026.6A CN202411889026A CN119525548A CN 119525548 A CN119525548 A CN 119525548A CN 202411889026 A CN202411889026 A CN 202411889026A CN 119525548 A CN119525548 A CN 119525548A
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tool
diameter
cutter
head
hole
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CN202411889026.6A
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CN119525548B (en
Inventor
冶敏
马旭耀
寇植达
潘天航
史晓亮
郝凯敏
周雅晨
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Shaanxi Fast Auto Drive Group Co Ltd
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Shaanxi Fast Auto Drive Group Co Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B35/00—Methods for boring or drilling, or for working essentially requiring the use of boring or drilling machines; Use of auxiliary equipment in connection with such methods
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B51/00—Tools for drilling machines
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B2251/00—Details of tools for drilling machines
    • B23B2251/04—Angles, e.g. cutting angles
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Drilling Tools (AREA)

Abstract

The small-aperture intermittent deep hole machining process is formed by machining a small-aperture intermittent deep hole machining tool set, wherein the small-aperture intermittent deep hole machining tool set comprises a first tool, a second tool, a third tool, a fourth tool and a fifth tool. The multi-edge support structure plays a supporting and guiding role in the front section hole during machining through the first multi-edge support shaft and the second multi-edge support shaft, so that the integral machining rigidity and stability are enhanced, the cutter breakage is avoided, the cost of the integral cutter is low, and the machining of the small-aperture intermittent deep hole can be efficiently and reliably completed.

Description

Small-aperture intermittent deep hole machining process
Technical Field
The invention belongs to the technical field of cutter machining, and particularly relates to a small-aperture intermittent deep hole machining process.
Background
With the increase of gearbox types, related lubricating oil ways on shell parts are more and more complex, small-aperture intermittent oil channels with the depth of more than 50 times of the diameter of a hole below the diameter D7 on the shell of an agricultural AT hydraulic gearbox such as a cotton picker are more and more, the oil channels are eccentrically intersected with bearing holes, the inclination of intermittent orifice faces is large, and the processing difficulty is extremely high. Because the cutter is too long in suspension depth and weak in rigidity, the common deep hole drill vibrating cutter is serious and is extremely easy to break, so that the machining efficiency is low and the cutter cost is high.
In particular, the external dimension of the agricultural gearbox shell is relatively large, so that the deep cavity and deep hole structure on the shell are quite large. The general deep hole processing of the oil duct adopts the schemes of guiding a cutter and gun drilling or guiding a cutter and integral alloy deep hole drilling, but when the two schemes process the intermittent deep hole with small diameter, the processing interruption cutter rate of the hole at the rear section is extremely high.
As shown in FIG. 1, the small-diameter oil hole on the AT gearbox of the company is in an intermittent structure which is eccentrically intersected with the bearing hole and divides the oil hole into a front section hole and a rear section hole. The aperture is 6-7 mm, the aperture tolerance is loose, the upper difference b=0.12 mm, the aperture depth L is generally more than 350mm, the length-diameter ratio L/D is more than or equal to 50, the axial length L4 of the aperture inclined plane of the rear section aperture is more than 1.2-D, the inclination is more than 50 degrees, when the aperture inclined plane of the rear section aperture is processed by adopting a common alloy deep hole drill or gun drill, the drill bit only receives one side radial force and cannot be centered, the cutting stability is poor, the vibration of the cutter bit is poor, the drill bit is easily deflected and broken due to the lack of support of the rear end of the cutter in the front hole, and the processing difficulty of the rear section aperture is extremely high. When the hole depth L exceeds 330mm of the length of the standard alloy bar, the whole alloy deep hole drill is required to customize a non-standard bar, and the cutter cost is extremely high. And because the cutter is too long in suspension depth, the machining rigidity is poor, the cutting parameters are required to be reduced, and the machining efficiency is limited. How to effectively reduce the problems of cutter vibration and cutter breakage in the rear section hole processing and to efficiently and reliably finish the processing of small-aperture intermittent deep holes with lower cutter cost is a key problem to be solved urgently.
Disclosure of Invention
Aiming at the problems, the invention aims to provide a small-aperture intermittent deep hole machining process which solves the problems of cutter vibration and cutter breakage of the existing cutter in the rear-section hole machining.
In order to achieve the above purpose, the technical scheme adopted by the invention comprises the following steps:
the small-aperture intermittent deep hole machining process is formed by machining a small-aperture intermittent deep hole machining tool set, wherein the small-aperture intermittent deep hole machining tool set comprises a first tool, a second tool, a third tool, a fourth tool and a fifth tool;
The first cutter is a first guide drill and comprises a first cutter head;
the second cutter comprises a second cutter head, the groove length L21 of the second cutter head is larger than the front section Kong Kongchang L1, the diameter d2 of the second cutter head is smaller than the diameter d1 of the first cutter head, and the point angle alpha 2 of the second cutter head is smaller than the point angle alpha 1 of the first cutter head;
The third cutter comprises a third cutter head and a first supporting shaft which are coaxially connected from front to back, wherein the diameter of the third cutter head is equal to that of the first multi-blade supporting shaft, L31 is more than L3, and (L1+L3+L4) - (L31+L32) is less than or equal to (25% -30%) L1, L31 is the length of the third cutter head, L3 is the distance between two adjacent ends of a front section hole and a rear section hole, L4 is the hole length of an orifice inclined plane of the rear section Kong Huoping, and L32 represents the length of the first multi-blade supporting shaft;
The fourth cutter is a second guiding drill and comprises a fourth cutter head, a cutter bar and a second multi-edge supporting shaft which are coaxially connected from front to back, wherein the diameters of the fourth cutter head, the cutter bar and the second multi-edge supporting shaft are equal, L41 is more than L3, and (L1+L3+L4+1.5D) - (L41+L42) are less than or equal to (25% -30%). L1, wherein L41 represents the length of the fourth cutter head and the cutter bar after being connected, and L42 represents the length of the second multi-edge supporting shaft;
The fifth cutter comprises a fifth cutter head, a chip removal groove is formed in the fifth cutter head from the front end of the fifth cutter head to the rear, and the length L51 of the chip removal groove is larger than L1+L3+L2;
the processing technology comprises the following specific steps:
s1, chamfering and deburring by using a guide hole and an orifice of a front section hole drilled by the first cutter 1, wherein the drilling depth is (1.5-2) D;
S2, drilling a front section hole by using the second cutter 2, wherein the drilling depth is L1+ (4-6) mm;
s3, countersinking the inclined surface part of the orifice of the rear-section hole into a plane by using the third cutter 3, and processing the depth L1+L3+L4;
S4, drilling a guide hole of a rear-section hole by using the fourth cutter 4, wherein the machining depth is L1+L3+L4+1.5D;
s5, drilling a rear hole to the depth required by the drawing by using the fifth cutter 5, and processing the depth L1+L3+L2.
Preferably, the first bit diameter d1 has a value ofThe value of the point angle alpha 1 of the first tool bit is 140 degrees, the value of the drilling depth l11 is 1.5D-2D, and D is the aperture to be processed.
Preferably, the cutting edge of the second cutter head comprises a double cutting edge and a single cutting edge which are coaxially connected from front to back, and the length l22 of the double cutting edge is 6D-7D.
Preferably, the bit diameter d2 of the second cutter is given byThe point angle α2 of the second tool takes a value of 136 °.
Preferably, the third cutter head is a 2-tooth flat bottom cutter head, the length l33 of the cutting edge of the third cutter head is more than or equal to 2.5 x L4, and the diameter d3 of the third cutter head takes the value ofD2-d3=0.005-0.025, the rake angle α3=90° of the first multi-blade support shaft, the margin β3=1.5, and the helix angle α31=20-25 °.
Preferably, the cutter body of the third cutter head has a diameter of 0.05-0.1 mm in single-side necking.
Preferably, the first multi-blade support shaft is a 6-blade support shaft.
Preferably, the point angle α4 of the fourth tool bit takes 140 °, the length l43=4d of the fourth tool bit edge and the drilling depth 1.5D to 2D, and the diameter D4 of the fourth tool bit takes the value
Preferably, the method comprises the steps of, the diameter of the cutter bar is 0.05-0.1 mm in a single-side necking way.
Preferably, the fifth bit diameter d5 takes on the value ofThe point angle α5 of the fifth tool bit takes a value of 120 °.
Compared with the prior art, the invention has the advantages that:
(1) According to the small-aperture intermittent deep hole machining process, the front section hole is used as the guide hole, the multi-edge support structure plays a supporting and guiding role in the front section hole during machining through the first multi-edge support shaft and the second multi-edge support shaft, the integral machining rigidity and stability are enhanced, broken cutters are avoided, the whole cutter is low in component cost, and machining of the small-aperture intermittent deep hole can be efficiently and reliably completed.
(2) According to the small-aperture intermittent deep hole machining process, the first cutter and the second cutter are both front-section hole machining cutters, the first cutter is a front-section hole machining guide drill, the second cutter is a front-section hole machining deep hole drill, the front-section hole can be independently machined, the cutter overhang can be shortened, the cutter rigidity can be improved to the greatest extent, the integral hard alloy with an inner cooling hole can be used, high cutting parameters can be used, machining efficiency can be improved, front-section hole machining precision and hole wall smoothness can be guaranteed, and a foundation is laid for rear-section hole machining.
(3) According to the small-aperture intermittent deep hole machining process, the third cutter, the fourth cutter and the fifth cutter are rear-section hole machining cutters, the third cutter is used for machining a Duan Huoping hole opening inclined surface part after hole machining, when the rear-section hole opening inclined surface part is countersunk, the first supporting shaft plays a supporting and guiding role in a front-section hole, the first supporting shaft is simple and easy to manufacture and good in precision, the third cutter is used for countersinking the rear-section hole opening inclined surface part into a plane, centering is good when the subsequent fourth cutter drills sharp holes, broken cutters are avoided, the fourth cutter guides the rear-section hole machining, the design of the second multi-edge supporting shaft ensures that the rear-section hole is always and effectively supported in machining, the cutter drills a guide hole of the rear-section hole, guides the cutter drill point, the cutter 5 is guaranteed to drill stably, and the whole deep hole machining is completed.
Drawings
The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate the invention and together with the description serve to explain, without limitation, the invention. In the drawings:
FIG. 1 is a schematic view of a small diameter oil hole in an AT gearbox;
FIG. 2 is a schematic structural view of a small-aperture intermittent deep hole machining tool set according to the present invention;
The reference numerals in the figures are:
1, a first cutter and a 1-1 first cutter head;
2 second cutters, 2-1 second cutter heads, 2-12 double-cutting-edge zones and 2-11 single-cutting-edge zones;
The three-blade cutter comprises a third cutter, a third cutter head 3-1, a first multi-blade supporting shaft 3-2 and a cutter body 3-10;
4 fourth cutters, 4-1 fourth cutter heads, 4-2 cutter bars and 4-21 second multi-edge support shafts;
5 fifth tool, 5-1 fifth tool bit, 5-10 junk slots.
Detailed Description
The application is not limited to the following specific embodiments, and all equivalent changes made on the basis of the technical scheme of the application fall within the protection scope of the application.
It should be noted that directional terms mentioned herein are consistent with a specific direction on a paper surface in the drawing of the specification or a corresponding direction of a space shown in the drawing, and all components and devices in the present invention, unless specifically stated, all use components and devices known in the art.
The aperture to be processed disclosed in the embodiment is D, D is more than or equal to 6 and less than or equal to 7mm, and the aperture tolerance requirement isB=0.12. The depth L of the hole to be processed is more than 350mm, the length-diameter ratio L/D is more than or equal to 50, the axial length L4 of the hole opening slope of the rear section hole is more than 1.2 x D, and the inclination is more than 50 degrees.
Examples
The embodiment discloses a small-aperture intermittent deep hole machining process, which is formed by machining a small-aperture intermittent deep hole machining tool set, wherein the small-aperture intermittent deep hole machining tool set comprises a first tool 1, a second tool 2, a third tool 3, a fourth tool 4 and a fifth tool 5;
The first cutter 1 is a first guiding drill and comprises a first cutter head 1-1;
the second cutter 2 comprises a second cutter head 2-1, the groove length L21 of the second cutter head 2-1 is larger than the front section Kong Kongchang L1, the diameter d2 of the second cutter head 2-1 is smaller than the diameter d1 of the first cutter head 1-1, and the point angle alpha 2 of the second cutter head 2-1 is smaller than the point angle alpha 1 of the first cutter head 1-1;
The third cutter 3 comprises a third cutter head 3-1 and a first supporting shaft 3-2 which are coaxially connected from front to back, wherein the third cutter head 3-1 and the first multi-blade supporting shaft 3-2 have the same diameter, L31 is more than L3 and less than or equal to (L1+L3+L4) - (L31+L32) is less than or equal to (25% -30%). L1, L31 is the length of the third cutter head 3-1, L3 is the distance between two adjacent ends of a front section hole and a rear section hole, L4 is the hole length of a rear section Kong Huoping hole inclined plane, and L32 represents the length of the first multi-blade supporting shaft 3-2;
the fourth cutter 4 is a second guiding drill and comprises a fourth cutter head 4-1, a cutter bar 4-2 and a second multi-edge support shaft 4-21 which are coaxially connected from front to back, wherein the diameters of the fourth cutter head 4-1, the cutter bar 4-2 and the second multi-edge support shaft 4-21 are equal, L41 is more than L3, and (L1+L3+L4+1.5D) - (L41+l42) are less than or equal to (25% -30%). L1, L41 represents the length of the fourth cutter head 4-1 and the cutter bar 4-2 after being connected, and L42 represents the length of the second multi-edge support shaft 4-21;
the fifth cutter 5 comprises a fifth cutter head 5-1, the fifth cutter head 5-1 is provided with a chip groove 5-10 from the front end to the rear, and the length L51 of the chip groove 5-10 is larger than L1+L3+L2;
The cutter has the effects that the first cutter 1 and the second cutter 2 are front section hole machining cutters, the first cutter 1 guides drilling for front section hole machining, the second cutter 2 is a front section hole machining deep hole drill, the cutter overhang can be shortened by independently machining the front section hole, the cutter rigidity can be improved to the greatest extent, an integral hard alloy in-band cold hole can be used, and not only can higher cutting parameters be used, so that the machining efficiency is improved, but also the front section hole machining precision and the hole wall smoothness can be guaranteed, and a foundation is laid for rear section hole machining. The third cutter 3, the fourth cutter 4 and the fifth cutter 5 are rear-section hole machining cutters, the third cutter 3 is used for machining a bevel part of a rear Duan Huoping hole opening, when the bevel part of the rear-section hole opening is reamed, the first supporting shaft 3-2 plays a supporting and guiding role in a front-section hole, the first supporting shaft 3-2 is simple and easy to manufacture and good in precision, the bevel part of the rear-section hole opening is reamed into a plane by using the third cutter 3, centering is good when a drill point of the subsequent fourth cutter 4 is drilled in, broken cutters are avoided, the fourth cutter 4 guides the drill for machining the rear-section hole, and the design of the second multi-edge supporting shaft 4-21 ensures effective supporting all the time in machining. And a guide hole of the rear section hole is drilled by using the cutter 4, so that the drill point of the cutter 5 is guided and guided, the cutter 5 is ensured to stably drill in, and the whole deep hole machining is completed.
The processing degree of difficulty of the intermittent deep hole in aperture of this scheme disclosed is mainly in the processing of back end hole, for solving disconnected sword problem, regard anterior segment hole as the guiding hole, play the support guide effect in anterior segment hole through first multi-blade back shaft 3-2 and the multi-blade back shaft 4-21 of second multi-blade back shaft 4-21 when processing, reinforcing whole processing rigidity and stability, effectively solved disconnected sword, cutter with high costs, the low problem of machining efficiency.
The first cutter disclosed in this embodiment adopts cemented carbide, and the diameter d1 of the first cutter head 1-1 takes the value ofThe point angle alpha 1 of the first tool bit 1-1 has a value of 140 degrees, the drilling depth l11 has a value of 1.5D-2D, and the composite orifice is chamfered, so that the efficiency is improved, the diameter of a handle part is increased, and the rigidity is improved.
The second cutter disclosed by the embodiment adopts hard alloy, the cutting edge of the second cutter head 2-1 comprises a double-edge belt 2-12 and a single-edge belt 2-11 which are coaxially connected from front to back, and the length l22 of the double-edge belt 2-12 is 6D-7D. The bit diameter d2 of the second cutter 2 takes on the value ofThe point angle α2 of the second tool 2 takes a value of 136 °.
The third cutter disclosed by the embodiment is made of powder metallurgy high-speed steel, has better toughness than a hard alloy cutter, is not easy to break, has lower cost than the alloy cutter, is a 2-tooth flat-bottom cutter head, is only subjected to axial force in processing, avoids the problem that a drill bit is not uniformly stressed in the radial direction on an inclined plane and cannot be centered, and is designed to be 2 teeth, so that enough chip containing space can be ensured. The length l33 of the cutting edge of the third tool bit 3-1 is more than or equal to 2.5 x L4, and the diameter d3 of the third tool bit 3-1 is taken as the valueD2-d3=0.005-0.025, the rake angle α3=90° of the first multi-blade support shaft 3-2, the margin β3=1.5, and the helix angle α31=20-25 °. In the embodiment, the diameter of the cutter body 3-10 of the third cutter head 3-1 is 0.05-0.1 mm, which is reduced by a single edge, so that Kong Kazhi is avoided, and the first multi-edge support shaft 3-2 is a 6-edge support shaft.
The point angle α4 of the fourth cutter head 4-1 disclosed in this embodiment is 140 °, the edge length l43=4d of the fourth cutter head 4-1 is 1.5D to 2D, and the diameter D4 of the fourth cutter head 4-1 is 140%Cutter bar 4-2 diameter 0.05 to 0.1 of single-side necking, avoiding the blocking of the inlet hole. The fourth tool bit 4-1 is made of hard alloy tool bar 4-2 and is made of high-speed powder metallurgy steel by sleeving and welding, so that the contact area and welding strength are increased, meanwhile, compared with an integral hard alloy drill bit, the butt welding structure greatly reduces the cost of the tool, and meanwhile, the hard alloy tool bit also ensures the service life and machining efficiency of the tool. Meanwhile, the rake angle, the margin width and the helix angle of the second multi-blade support shaft 4-21 disclosed in the embodiment are the same as those of the first multi-blade support shaft 3-2.
The diameter d5 of the fifth cutter head 5-1 disclosed in the embodiment takes the value ofThe point angle α5 of the fifth bit 5-1 takes a value of 120 °. Compared with the integral hard alloy drill bit, the brazing type gun drill has the advantages of low cost, better toughness and difficult cutter breakage. The cutter belt inner cooling can effectively remove chips, and the hard alloy cutter head is provided with a guide strip structure and can be stably drilled all the time after entering the guide hole.
The processing technology of the small-aperture intermittent deep hole by using the cutter group in the embodiment specifically comprises the following steps:
s1, chamfering and deburring a guide hole and an orifice of a front section hole by using a first cutter 1, wherein the drilling depth is 1.5-2;
S2, drilling a front section hole by using a second cutter 2, wherein the drilling depth is L1+ (4-6) mm;
S3, countersinking the inclined surface part of the orifice of the rear-stage hole into a plane by using a third cutter 3, wherein the machining depth is L1+L3+L4;
S4, drilling a guide hole of a rear-section hole by using a fourth cutter 4, wherein the machining depth is L1+L3+L4+1.5D;
s5, drilling a rear hole to the depth required by the drawing by using a fifth cutter 5, and finishing the machining of the small-diameter intermittent deep hole shown in FIG. 1 by machining the depth L1+L3+L2.
The preferred embodiments of the present disclosure have been described in detail above with reference to the accompanying drawings, but the present disclosure is not limited to the specific details of the embodiments described above, and various simple modifications may be made to the technical solutions of the present disclosure within the scope of the technical concept of the present disclosure, and all the simple modifications belong to the protection scope of the present disclosure.
In addition, the specific features described in the foregoing embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, the present disclosure does not further describe various possible combinations. Moreover, any combination of the various embodiments disclosed in the present embodiment can be made, so long as it does not deviate from the idea of the present disclosure, and it should also be regarded as the invention of the present disclosure.

Claims (10)

1.一种小孔径断续深孔加工工艺，其特征在于，由小孔径断续深孔加工刀具组加工而成，所述小孔径断续深孔加工刀具组包括第一刀具(1)、第二刀具(2)、第三刀具(3)、第四刀具(4)和第五刀具(5)；1. A small-diameter intermittent deep hole machining process, characterized in that it is machined by a small-diameter intermittent deep hole machining tool set, wherein the small-diameter intermittent deep hole machining tool set comprises a first tool (1), a second tool (2), a third tool (3), a fourth tool (4) and a fifth tool (5); 所述第一刀具(1)为第一引导钻，包括第一刀头(1-1)；所述第二刀具(2)；The first tool (1) is a first pilot drill, comprising a first tool head (1-1); the second tool (2); 所述第二刀具(2)包括第二刀头(2-1)，第二刀头(2-1)的槽长l21＞前段孔孔长L1，第二刀头(2-1)的直径d2＜第一刀头(1-1)的直径d1，第二刀头(2-1)的钻尖角α2＜第一刀头(1-1)的钻尖角α1；The second tool (2) comprises a second cutter head (2-1), a groove length l21 of the second cutter head (2-1)> a front hole length L1, a diameter d2 of the second cutter head (2-1)< a diameter d1 of the first cutter head (1-1), and a drill point angle α2 of the second cutter head (2-1)< a drill point angle α1 of the first cutter head (1-1); 所述第三刀具(3)包括自前而后同轴连设的第三刀头(3-1)和第一支撑轴(3-2)，第三刀头(3-1)与第一多刃支撑轴(3-2)等径，满足l31＞L3且(L1+L3+L4)-(l31+l32)≤(25％～30％)*L1；其中，l31为第三刀头(3-1)的长度，L3为前段孔和后段孔相邻两端的间距，L4为后段孔锪平孔口斜面的孔长，l32表示第一多刃支撑轴(3-2)的长度；The third tool (3) comprises a third tool head (3-1) and a first support shaft (3-2) which are coaxially connected from front to back, the third tool head (3-1) and the first multi-blade support shaft (3-2) are of equal diameter, satisfying l31>L3 and (L1+L3+L4)-(l31+l32)≤(25%-30%)*L1; wherein l31 is the length of the third tool head (3-1), L3 is the distance between the adjacent ends of the front hole and the rear hole, L4 is the hole length of the inclined surface of the rear hole, and l32 represents the length of the first multi-blade support shaft (3-2); 所述第四刀具(4)为第二引导钻，包括自前而后同轴连设的第四刀头(4-1)、刀杆(4-2)和第二多刃支撑轴(4-21)，第四刀头(4-1)、刀杆(4-2)和第二多刃支撑轴(4-21)等径，满足l41＞L3且(L1+L3+L4+1.5D)-(l41+l42)≤(25％～30％)*L1；其中，l41表示第四刀头(4-1)和刀杆(4-2)连接后的长度，l42表示第二多刃支撑轴(4-21)的长度；The fourth tool (4) is a second guide drill, comprising a fourth tool head (4-1), a tool rod (4-2) and a second multi-blade support shaft (4-21) which are coaxially connected from front to back, the fourth tool head (4-1), the tool rod (4-2) and the second multi-blade support shaft (4-21) having equal diameters, satisfying l41>L3 and (L1+L3+L4+1.5D)-(l41+l42)≤(25%-30%)*L1; wherein l41 represents the length of the fourth tool head (4-1) and the tool rod (4-2) after being connected, and l42 represents the length of the second multi-blade support shaft (4-21); 所述第五刀具(5)包括第五刀头(5-1)，所述第五刀头(5-1)自其前端向后设有排屑槽(5-10)，排屑槽(5-10)长l51＞L1+L3+L2；The fifth tool (5) comprises a fifth tool head (5-1), and the fifth tool head (5-1) is provided with a chip removal groove (5-10) from the front end thereof to the rear, and the length of the chip removal groove (5-10) is l51>L1+L3+L2; 加工工艺具体步骤如下：The specific steps of the processing technology are as follows: S1，使用所述第一刀具(1)钻前段孔的引导孔及孔口倒角去毛刺，钻深(1.5～2)*D；S1, using the first tool (1) to drill the guide hole of the front hole and chamfer and deburr the hole mouth, with a drilling depth of (1.5-2)*D; S2，使用所述第二刀具(2)钻通前段孔，钻深L1+(4～6)mm；S2, using the second tool (2) to drill through the front hole to a depth of L1+(4-6) mm; S3，使用所述第三刀具(3)将后段孔孔口斜面部分锪为平面，加工深度L1+L3+L4；S3, using the third tool (3) to countersink the inclined surface of the rear hole into a flat surface, with a processing depth of L1+L3+L4; S4，使用所述第四刀具(4)钻后段孔的引导孔，加工深度L1+L3+L4+1.5D；S4, using the fourth tool (4) to drill the guide hole of the rear section hole to a processing depth of L1+L3+L4+1.5D; S5，使用所述第五刀具(5)钻后段孔至图纸要求深度，加工深度L1+L3+L2。S5, using the fifth tool (5) to drill the rear hole to the depth required by the drawing, with the processing depth being L1+L3+L2. 2.如权利要求1所述的小孔径断续深孔加工刀具组，其特征在于，所述第一刀头(1-1)直径d1取值为第一刀头(1-1)的钻尖角α1取值为140°、钻深l11取值为1.5D～2D；2. The small-diameter intermittent deep hole machining tool set according to claim 1, characterized in that the diameter d1 of the first tool head (1-1) is The drill point angle α1 of the first cutter head (1-1) is 140°, and the drill depth l11 is 1.5D to 2D; 其中，D为待加工孔径。Where D is the diameter of the hole to be processed. 3.如权利要求1所述的小孔径断续深孔加工刀具组，其特征在于，所述第二刀头(2-1)的刃带包括自前而后同轴连设的双刃带(2-12)和单刃带(2-11)，双刃带(2-12)的长度l22取值为6D～7D。3. The small-diameter intermittent deep hole machining tool set as described in claim 1 is characterized in that the edge band of the second tool head (2-1) includes a double edge band (2-12) and a single edge band (2-11) coaxially connected from front to back, and the length l22 of the double edge band (2-12) is 6D~7D. 4.如权利要求3所述的小孔径断续深孔加工刀具组，其特征在于，所述第二刀具(2)的钻头直径d2取值为第二刀具(2)的钻尖角α2取值为136°。4. The small-diameter intermittent deep hole machining tool set according to claim 3, characterized in that the drill diameter d2 of the second tool (2) is The drill point angle α2 of the second tool (2) is 136°. 5.如权利要求1所述的小孔径断续深孔加工刀具组，其特征在于，所述第三刀头(3-1)为2齿平底刀头，第三刀头(3-1)的切削刃长度l33≥2.5*L4，第三刀头(3-1)的直径d3取值为d2-d3＝0.005～0.025；5. The small-diameter intermittent deep hole machining tool set according to claim 1 is characterized in that the third cutter head (3-1) is a 2-tooth flat-bottom cutter head, the cutting edge length l33 of the third cutter head (3-1) is ≥ 2.5*L4, and the diameter d3 of the third cutter head (3-1) is d2-d3=0.005-0.025; 所述第一多刃支撑轴(3-2)的前角α3＝90°、刃带宽β3＝1.5、螺旋角α31＝20～25°。The first multi-blade support shaft (3-2) has a rake angle α3=90°, a blade width β3=1.5, and a helix angle α31=20-25°. 6.如权利要求5所述的小孔径断续深孔加工刀具组，其特征在于，所述第三刀头(3-1)的刀体(3-10)直径单边缩颈0.05～0.1mm。6. The small-diameter intermittent deep hole machining tool set according to claim 5, characterized in that the diameter of the tool body (3-10) of the third tool head (3-1) is shrunk on one side by 0.05 to 0.1 mm. 7.如权利要求6所述的小孔径断续深孔加工刀具组，其特征在于，所述第一多刃支撑轴(3-2)为6刃支撑轴。7. The small-diameter intermittent deep hole machining tool set according to claim 6, characterized in that the first multi-blade support shaft (3-2) is a 6-blade support shaft. 8.如权利要求1所述的小孔径断续深孔加工刀具组，其特征在于，所述第四刀头(4-1)的钻尖角α4取值为140°，第四刀头(4-1)刃长l43＝4D、钻深1.5D～2D，第四刀头(4-1)直径d4取值 8. The small-diameter intermittent deep hole machining tool set according to claim 1 is characterized in that the drill point angle α4 of the fourth tool head (4-1) is 140°, the blade length l43 of the fourth tool head (4-1) is 4D, the drilling depth is 1.5D to 2D, and the diameter d4 of the fourth tool head (4-1) is 9.如权利要求8所述的小孔径断续深孔加工刀具组，其特征在于，所述刀杆(4-2)直径单边缩颈0.05～0.1mm。9. The small-diameter intermittent deep hole machining tool set according to claim 8, characterized in that the diameter of the tool rod (4-2) is shrunk on one side by 0.05 to 0.1 mm. 10.如权利要求1所述的小孔径断续深孔加工刀具组，其特征在于，所述第五刀头(5-1)直径d5取值为第五刀头(5-1)的钻尖角α5取值为120°。10. The small-diameter intermittent deep hole machining tool set according to claim 1, characterized in that the diameter d5 of the fifth tool head (5-1) is The drill point angle α5 of the fifth cutting head (5-1) is 120°.
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