CN111482641B - Eccentricity adjusting method for spiral milling hole - Google Patents

Eccentricity adjusting method for spiral milling hole Download PDF

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CN111482641B
CN111482641B CN202010313976.XA CN202010313976A CN111482641B CN 111482641 B CN111482641 B CN 111482641B CN 202010313976 A CN202010313976 A CN 202010313976A CN 111482641 B CN111482641 B CN 111482641B
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eccentric
eccentricity
main shaft
outer sleeve
range
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CN111482641A (en
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康仁科
杨国林
董志刚
高宇
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Dalian University of Technology
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C3/00—Milling particular work; Special milling operations; Machines therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C9/00—Details or accessories so far as specially adapted to milling machines or cutter
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F17/00—Digital computing or data processing equipment or methods, specially adapted for specific functions
    • G06F17/10—Complex mathematical operations
    • G06F17/11—Complex mathematical operations for solving equations, e.g. nonlinear equations, general mathematical optimization problems

Abstract

The invention provides an eccentric adjusting method of a spiral milling hole. The method comprises the steps that an outer sleeve is matched with a plurality of eccentric main shafts with different eccentric amounts, all the eccentric main shafts are identical in appearance and can be installed in the outer sleeve and can be rapidly replaced, the eccentric amount value required to be adjusted by the spiral hole milling device is calculated according to the machining requirement, and the eccentric main shaft with the eccentric amount adjusting range including the eccentric amount adjusting value is selected. When any eccentric main shaft is installed, the eccentric adjustable range is small, so that the accurate adjustment of the eccentric amount can be realized, and the large-range adjustment of the eccentric amount can be realized by replacing the eccentric main shaft. The invention overcomes the defects of the eccentric adjustment method of the traditional spiral hole milling device, simultaneously realizes high-precision adjustment and large-range adjustment of the eccentric amount, enlarges the range of the processing aperture, improves the processing quality, improves the processing efficiency and reduces the processing cost.

Description

Eccentricity adjusting method for spiral milling hole
Technical Field
The invention relates to the technical field of hole making processing in aerospace craft assembly, in particular to an eccentric adjusting method for spiral hole milling.
Background
The principle of the spiral hole milling is that a special end mill is adopted, a cutter revolves around the axis of a processed hole while rotating at a high speed, and feeds in the direction of the axis of the processed hole, and finally a round hole with a diameter larger than that of the cutter is milled on a workpiece, and the cutter feeding track is in a spiral line shape, so that the spiral hole milling is called. To the system hole of novel materials such as combined material, titanium alloy, because the spiral milling hole axial cutting force is less than the drilling, consequently demonstrate the characteristics that are superior to traditional drilling, the spiral milling hole is applied to the aircraft assembly, replaces traditional drilling to process some bolt holes and rivet holes that high quality required, and the range of application constantly enlarges. Different from the traditional drilling, the processing aperture of the spiral milling hole not only depends on the diameter of the cutter, but also is directly related to the eccentricity of the cutter, and the processing aperture of the spiral milling hole is equal to the diameter of the cutter plus twice of the eccentricity.
The existing spiral hole milling equipment generally adopts a double-eccentric sleeve principle to realize the adjustment of the eccentric amount, the eccentric amounts of an inner sleeve and an outer sleeve are both unchangeable, and the adjustment range of the eccentric amount is determined after the equipment is manufactured. However, no matter how the size of the eccentric amount adjusting range is, the eccentric amount of the cutter is changed by changing the relative rotation angle of the inner sleeve and the outer sleeve during operation, and the change of the eccentric amount from the minimum value to the maximum value is realized in the process of relative rotation of the inner sleeve and the outer sleeve by 180 degrees. Therefore, when the adjustable range of the eccentric amount is large, the eccentric amount can be greatly changed when the inner sleeve and the outer sleeve rotate relatively for a small angle, the micro-adjustment of the eccentric amount is difficult to realize, and the adjustment precision of the eccentric amount is influenced; when the adjustable range of the eccentric amount is small, the inner sleeve and the outer sleeve need to rotate relatively by a larger angle by the same value of the change of the eccentric amount, the micro-adjustment of the eccentric amount is easier to realize, the eccentric adjustment precision is improved, but the hole machining range of the spiral hole milling equipment is correspondingly reduced due to the small adjustment range of the eccentric amount. Therefore, for the eccentricity adjusting method of the existing spiral hole milling equipment, the improvement of the eccentricity adjusting precision and the improvement of the adjusting range are mutually contradictory and are difficult to realize simultaneously.
To sum up, the main difficulty of spiral milling device eccentricity adjustment lies in: (1) if the eccentric amount is not accurately adjusted, the machining hole diameter is unqualified directly. In order to machine a machined hole with a qualified size, the spiral hole milling device needs to adjust the eccentricity to be small enough in error with a theoretical value through the eccentric adjusting mechanism so as to ensure that the actually machined hole is qualified in size. (2) If the change range of the processing aperture is large, the adjustment range of the eccentric amount needs to be ensured to be large enough, otherwise, cutters with different diameters need to be replaced in the processing process to meet the processing requirements of different apertures, the processing efficiency is reduced, and the processing cost is increased. Therefore, it is urgently needed to provide a spiral milling hole eccentricity adjusting method which ensures that the eccentricity has a sufficiently large adjusting range and a sufficiently high adjusting precision.
Disclosure of Invention
In accordance with the technical problem set forth above, a method for adjusting eccentricity of a helical milled hole is provided. The technical means adopted by the invention are as follows:
an eccentric adjustment method for spiral milling holes comprises the following steps:
s1, the spiral hole milling device is provided with an outer sleeve with a fixed eccentricity and a plurality of eccentric main shafts with different eccentricities, and the eccentricity of the outer sleeve is set as e0The eccentricity of n eccentric main shafts is e1，e2，…，enAll the eccentric main shafts have the same external dimension and can be arranged in the outer sleeve for use;
s2, according to e in step S10And enCalculating the installation corresponding eccentricity enThe eccentric amount adjusting range e of the spiral hole milling device during eccentric main shafta～ebObtaining the eccentric quantity adjusting ranges corresponding to the n eccentric main shafts as follows: | e1-e0|～|e1+e0|，|e2-e0|～|e2+e0|，…|en-e0|～|en+e0|；
S3, calculating the required adjusting eccentric magnitude e of the spiral hole milling device according to the machining requirement;
s4, selecting the eccentricity adjustment range e according to the required adjustment eccentricity value e obtained in the step S3a～ebAn eccentric spindle containing e;
s5, mounting the eccentric main shaft selected in the step S4 on a spiral hole milling device, rotating the eccentric main shaft, and adjusting the eccentric amount to be e;
s6, after the eccentric adjustment is finished, fixing the position of the eccentric main shaft and the position of the outer sleeve;
s7, if the eccentric amount needs to be adjusted, go to step S3-step S5.
Further, the eccentric amount e of the outer sleeve in the step S10And eccentricity e of the eccentric spindlenHas the following steps:
s11, determining the corresponding eccentricity adjusting range value e in the maximum measuring range of the graduated ring of the eccentric main shaft based on the highest resolution ratio which can be reached by the graduated scale dimension lines on the graduated ring of the eccentric main shaftmDetermining the eccentricity e of the outer sleeve0Should satisfy e0≤em/2；
S12. Determining the adjustment range e of the eccentricity of the spiral hole milling device according to the processing requirements of the range of the diameter of the type of the cutter to be processed and the size of the aperture to be processedx～ey；
S13, determining the minimum number n (| e) of eccentric spindles equippedx-ey|)/2e0Wherein n is rounded up;
s14, adjusting the range e according to the eccentricity determined in the step S12x～eyAnd determining the adjusting eccentricity range e corresponding to the n eccentric main shafts according to the number n of the eccentric main shafts calculated in the step S13a～ebShould satisfy ex～ey∈ea～eb，
I.e. [ e ]x，ey]∈[|e1-e0|，|e1+e0|]∪[|e2-e0|，|e2+e0|]∪…∪[|en-e0|，|en+e0|]；
S15, determining the eccentricity e of the outer sleeve according to the step S110And determining the adjusting eccentricity range e corresponding to the n eccentric main shafts in the step S14a～ebI.e. | e1-e0|～|e1+e0|，|e2-e0|～|e2+e0|，…|en-e0|～|en+e0L, determining the eccentricity of n eccentric main shafts as en(e1，e2…en)。
Furthermore, the spiral hole milling device comprises a cutter, an eccentric main shaft and an outer sleeve, wherein the output section of the outer sleeve is of an eccentric structure, namely the axis of the outer cylindrical surface of the outer sleeve and the axis of the inner hole of the output section of the outer sleeve have a certain eccentric amount of e0The eccentric main shaft is sleeved in an inner hole of the outer sleeve output section, the eccentric main shaft comprises a main shaft and an inner sleeve with an eccentric structure, the main shaft is sleeved in the inner hole of the inner sleeve through a main shaft bearing, the output end of the main shaft is provided with a cutter through a chuck, and the axis of the outer cylindrical surface of the inner sleeve and the axis of the inner hole have a certain eccentric amount enI.e. the outer cylindrical surface of said eccentric spindleThe eccentricity of the axis and the axis of the tool is en。
Further, in step S5, the eccentric spindle is rotated to generate relative rotation between the eccentric spindle and the outer sleeve to complete fine adjustment of the eccentric amount, and the eccentric amount of the tool relative to the outer cylindrical surface of the outer sleeve is changed by adjusting the relative rotation angle θ between the outer sleeve and the eccentric spindle, so as to obtain different eccentric amounts of
Figure GDA0002958188620000031
e has a value range of | en-e0|≤e≤|en+e0|。
Further, in step S5, after the eccentric spindle is installed in the helical hole milling device, the transmission mechanism drives the outer sleeve to rotate relative to the sleeve housing, so as to complete the rotation of the tool around the axis of the outer cylindrical surface of the outer sleeve, specifically, the outer sleeve is installed in the sleeve housing through the sliding bearing, and the input side of the outer sleeve is connected to the transmission mechanism.
Furthermore, the transmission mechanism comprises a motor and a synchronous toothed belt, a first synchronous toothed belt wheel is mounted at the input end of the outer sleeve, and the first synchronous toothed belt wheel is connected with a second synchronous belt wheel mounted at the output end of the motor through the synchronous toothed belt.
The invention has the following advantages:
the invention adopts a form that one outer sleeve is matched with a plurality of eccentric main shafts with different eccentric amounts, all the eccentric main shafts have the same appearance, can be arranged in the outer sleeve and can be quickly replaced, and the eccentric adjustable range is smaller when any one eccentric main shaft is arranged, so that the accurate adjustment of the eccentric amount can be realized, and the large-range adjustment of the eccentric amount can be realized by replacing the eccentric main shaft. The invention overcomes the defects of the eccentric adjustment method of the traditional spiral hole milling device, simultaneously realizes high-precision adjustment and large-range adjustment of the eccentric amount, enlarges the range of the processing aperture, improves the processing quality, improves the processing efficiency and reduces the processing cost.
Based on the reasons, the invention can be widely popularized in the technical field of hole making processing.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a flow chart of the eccentric adjustment method of the helical milling hole of the invention.
Fig. 2 is a schematic cross-sectional view of a helical milling device according to an eccentric adjustment method of helical milling according to an embodiment of the present invention.
Fig. 3 is an eccentricity diagram illustrating an eccentricity adjusting method for helical milling holes according to an embodiment of the present invention.
In the figure, 1 is a cutter, 2 is a main shaft, 3 is an inner sleeve, and 4 is an outer sleeve.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, the present embodiment provides an eccentric adjustment method of a helical milled hole, including the following steps:
s1, the spiral hole milling device is provided with an outer sleeve 4 with a fixed eccentricity and a plurality of eccentric main shafts with different eccentricities, and the eccentricity of the outer sleeve 4 is set as e0The eccentricity of n eccentric main shafts is e1，e2，…，enAll the eccentric main shafts have the same external dimension and can be arranged in the outer sleeve 4 for use;
s2, according to e in step S10And enComputing installation pairsAmount of eccentricity enThe eccentric amount adjusting range e of the spiral hole milling device during eccentric main shafta～ebObtaining the eccentric quantity adjusting ranges corresponding to the n eccentric main shafts as follows: | e1-e0|～|e1+e0|，|e2-e0|～|e2+e0|，…|en-e0|～|en+e0|；
S3, calculating the required adjusting eccentric magnitude e of the spiral hole milling device according to the machining requirement;
s4, selecting the eccentricity adjustment range e according to the required adjustment eccentricity value e obtained in the step S3a～ebAn eccentric spindle containing e;
s5, mounting the eccentric main shaft selected in the step S4 on a spiral hole milling device, rotating the eccentric main shaft, and adjusting the eccentric amount to be e;
s6, after the eccentric adjustment is finished, fixing the position of the eccentric main shaft and the position of the outer sleeve 4;
s7, if the eccentric amount needs to be adjusted, go to step S3-step S5.
The eccentricity e of the outer sleeve 4 in the step S10And eccentricity e of the eccentric spindlenHas the following steps:
s11, determining the corresponding eccentricity adjusting range value e in the maximum measuring range of the graduated ring of the eccentric main shaft based on the highest resolution ratio which can be reached by the graduated scale dimension lines on the graduated ring of the eccentric main shaftmDetermining the eccentricity e of the outer sleeve 40Should satisfy e0≤em/2；
S12, determining the eccentricity adjusting range e of the spiral hole milling device according to the processing requirements of the type diameter range and the aperture size range of the tool 1 to be processedx～ey；
S13, determining the minimum number n (| e) of eccentric spindles equippedx-ey|)2e0Wherein n is rounded up;
s14, adjusting the range e according to the eccentricity determined in the step S12x～eyAnd the eccentric main shaft calculated in step S13N, determining the adjusting eccentricity range e corresponding to the n eccentric main shaftsa～ebShould satisfy ex～ey∈ea～eb，
I.e. [ e ]x，ey]∈[|e1-e0|，|e1+e0|]∪[|e2-e0|，|e2+e0|]∪…∪[|en-e0|，|en+e0|]；
S15, determining the eccentricity e of the outer sleeve 4 according to the step S110And determining the adjusting eccentricity range e corresponding to the n eccentric main shafts in the step S14a～ebI.e. | e1-e0|～|e1+e0|，|e2-e0|～|e2+e0|，…|en-e0|～|en+e0L, determining the eccentricity of n eccentric main shafts as en(e1，e2…en)。
In this embodiment, the helical hole milling apparatus mentioned in step S1 is shown in fig. 2, the helical hole milling apparatus includes a tool 1, an eccentric spindle, and an outer sleeve 4, an output section of the outer sleeve 4 is an eccentric structure, that is, an axis of an outer cylindrical surface of the outer sleeve 4 and an axis of an inner hole of the output section of the outer sleeve 4 have a certain eccentricity e0The eccentric main shaft is sleeved in an inner hole of an output section of the outer sleeve 4, the eccentric main shaft comprises a main shaft 2 and an inner sleeve 3 with an eccentric structure, the main shaft 2 is sleeved in an inner hole of the inner sleeve 3 through a main shaft bearing, the output end of the main shaft 2 passes through the chuck mounting tool 1, and an outer cylindrical surface axis and an inner hole axis of the inner sleeve 3 have certain eccentric amount enI.e. the eccentricity between the axis of the outer cylindrical surface of the eccentric main shaft and the axis of the tool 1 is en。
In step S5, as shown in fig. 3, the working principle of adjusting the eccentricity of the helical milling device is as follows: the eccentric main shaft is rotated to generate relative rotation between the eccentric main shaft and the outer sleeve 4 to finish the fine adjustment of the eccentric amount, and the eccentric amount of the cutter 1 relative to the outer cylindrical surface of the outer sleeve 4 is changed by adjusting the relative rotation angle theta between the outer sleeve 4 and the eccentric main shaft, so that different eccentric amounts are obtainedAn eccentricity of
Figure GDA0002958188620000061
e has a value range of | en-e0|≤e≤|en+e0|。
In step S5, after the eccentric spindle is installed in the helical hole milling device, the transmission mechanism drives the outer sleeve 4 to rotate relative to the sleeve housing, so as to complete the rotation of the tool 1 around the axis of the outer cylindrical surface of the outer sleeve 4, specifically, the outer sleeve 4 is installed in the sleeve housing through the sliding bearing, and the input side of the outer sleeve 4 is connected to the transmission mechanism.
Specifically, in this embodiment, in order to reduce the size of the whole device, the transmission mechanism includes a motor and a synchronous toothed belt, the input end of the outer sleeve 4 is provided with a first synchronous toothed belt wheel, the first synchronous toothed belt wheel is connected with a second synchronous belt wheel arranged at the output end of the motor through the synchronous toothed belt, and the position of the axis of the outer sleeve 4 can be adjusted by adopting other transmission modes.
Example 1
In this embodiment, the outer sleeve 4 of the helical milling device has an eccentricity e0And (3) machining holes with phi 10 and phi 13 by using a phi 8 milling cutter, wherein the machining steps are as follows:
s1, selecting one outer sleeve 4 with the eccentricity e0The eccentricity of 4 eccentric main shafts is e respectively as 0.5n＝0.5，1.5，2.5，3.5；
S2, according to e in step S100.5 and enCorresponding eccentricity e is calculated as 0.5, 1.5, 2.5, 3.5nEccentricity adjustment range e of helical hole milling device of eccentric spindle of 0.5, 1.5, 2.5, 3.5a～ebObtaining the eccentric amount adjusting ranges corresponding to the 4 eccentric main shafts as follows: [0,1]，[1,2]，[2,3]，[3,4]；
S3, calculating the theoretical value e of the eccentric amount required to be adjusted of the spiral hole milling device, namely (D-D)/2, namely 1 according to the diameter D of the hole to be machined, namely phi 10 and the diameter D of the cutter 1 to be machined, namely phi 8;
s4, selecting the offset according to the theory e of the required eccentric adjustment amount obtained in the step S3 as 1Heart rate regulating range eab＝[1,2]The eccentric main shaft of (a);
s5, mounting the eccentric spindle selected in the step S4 on a spiral hole milling device, and adjusting the eccentric amount to be 1;
s6, clamping the workpiece to be machined and the machining tool 1, and performing spiral milling to form a hole;
s7, calculating the theoretical value e of the eccentric amount required to be adjusted of the spiral hole milling device, namely (D-D)/2, namely 2.5 according to the diameter D of the hole to be machined, namely phi 13 and the diameter D of the cutter 1 to be machined, namely phi 8;
s8, according to the theory e of the eccentric amount needed to be adjusted obtained in the step S7, the eccentric amount adjusting range e is selected to be 2.5ab＝[2,3]The eccentric main shaft of (a);
s9, mounting the eccentric spindle selected in the step S8 on a spiral hole milling device, and adjusting the eccentric amount to be 2.5;
s10, clamping the workpiece to be machined and the machining tool 1, and performing spiral milling to form a hole;
and S11, finishing hole making.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims (4)

1. An eccentric adjustment method for a spiral milled hole is characterized by comprising the following steps:
s1, the spiral hole milling device is provided with an outer sleeve with a fixed eccentricity and a plurality of eccentric main shafts with different eccentricities, and the eccentricity of the outer sleeve is set as e0The eccentricity of n eccentric main shafts is e1，e2，…，enAll the eccentric main shafts have the same external dimension and can be arranged in the outer sleeve for use;
s2, according to e in step S10And enCalculating the installation corresponding eccentricity enThe eccentric amount adjusting range e of the spiral hole milling device during eccentric main shafta～ebObtaining the eccentric quantity adjusting ranges corresponding to the n eccentric main shafts as follows: | e1-e0|～|e1+e0|，|e2-e0|～|e2+e0|，…|en-e0|～|en+e0|；
S3, calculating the required adjusting eccentric magnitude e of the spiral hole milling device according to the machining requirement;
s4, selecting the eccentricity adjustment range e according to the required adjustment eccentricity value e obtained in the step S3a～ebAn eccentric spindle containing e;
s5, mounting the eccentric main shaft selected in the step S4 on a spiral hole milling device, rotating the eccentric main shaft, and adjusting the eccentric amount to be e;
s6, after the eccentric adjustment is finished, fixing the position of the eccentric main shaft and the position of the outer sleeve;
s7, if the eccentric amount needs to be adjusted, go to step S3-step S5.
2. The method for adjusting eccentricity of spiral milling hole according to claim 1, wherein the eccentricity e of the outer sleeve in step S10And eccentricity e of the eccentric spindlenHas the following steps:
s11, determining the corresponding eccentricity adjusting range value e in the maximum measuring range of the graduated ring of the eccentric main shaft based on the highest resolution ratio which can be reached by the graduated scale dimension lines on the graduated ring of the eccentric main shaftmDetermining the eccentricity e of the outer sleeve0Should satisfy e0≤em/2；
S12, determining the eccentricity adjustment range e of the spiral hole milling device according to the machining requirements of the type diameter range and the aperture size range of the tool to be machinedx～ey；
S13, determining the minimum number n (| e) of eccentric spindles equippedx-ey|)/2e0Wherein n is rounded up;
s14, adjusting the range e according to the eccentricity determined in the step S12x～eyAnd determining the adjusting eccentricity range e corresponding to the n eccentric main shafts according to the number n of the eccentric main shafts calculated in the step S13a～ebShould satisfy ex～ey∈ea～eb，
I.e. [ e ]x，ey]∈[|e1-e0|，|e1+e0|]∪[|e2-e0|，|e2+e0|]∪…∪[|en-e0|，|en+e0|]；
S15, determining the eccentricity e of the outer sleeve according to the step S110And determining the adjusting eccentricity range e corresponding to the n eccentric main shafts in the step S14a～ebI.e. | e1-e0|～|e1+e0|，|e2-e0|～|e2+e0|，…|en-e0|～|en+e0L, determining the eccentricity of n eccentric main shafts as en(e1，e2…en)。
3. The method for adjusting eccentricity of a helical milled hole according to claim 1, wherein the helical milling device comprises a cutter, an eccentric spindle and an outer sleeve, the output section of the outer sleeve is of an eccentric structure, that is, the axis of the outer cylindrical surface of the outer sleeve and the axis of the inner hole of the output section of the outer sleeve have a certain eccentricity e0The eccentric main shaft is sleeved in an inner hole of the outer sleeve output section, the eccentric main shaft comprises a main shaft and an inner sleeve with an eccentric structure, the main shaft is sleeved in the inner hole of the inner sleeve through a main shaft bearing, the output end of the main shaft is provided with a cutter through a chuck, and the axis of the outer cylindrical surface of the inner sleeve and the axis of the inner hole have a certain eccentric amount enI.e. the eccentricity of the axis of the outer cylindrical surface of the eccentric main shaft and the axis of the cutter is en。
4. The screw according to claim 1The eccentric adjusting method of the rotary milling hole is characterized in that in the step S5, the eccentric main shaft is rotated to enable the eccentric main shaft and the outer sleeve to generate relative rotation to finish the fine adjustment of the eccentric amount, the eccentric amount of the cutter relative to the outer cylindrical surface of the outer sleeve is changed by adjusting the relative rotation angle theta between the outer sleeve and the eccentric main shaft, and then different eccentric amounts are obtained
Figure FDA0002958188610000021
e has a value range of | en-e0|≤e≤|en+e0|。
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NL9200484A (en) * 1992-03-16 1993-10-18 Instrucon Instr Bv Drill head
US6719505B2 (en) * 1999-09-01 2004-04-13 Novator Ab Orbital hand tool apparatus for drilling
CN202180368U (en) * 2011-08-11 2012-04-04 天润曲轴股份有限公司 Eccentric fixture of bent axle
CN106077774B (en) * 2016-07-07 2018-01-30 大连理工大学 A kind of ultrasonic helical milling device and processing method
CN108608019B (en) * 2018-05-04 2020-04-14 大连理工大学 Hole making method combining drilling and spiral milling
CN108927557B (en) * 2018-08-17 2024-02-13 西安增材制造国家研究院有限公司 Spiral hole milling device and method

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