Grinding process of helical micro-drill using a six-axis CNC grinding machine and its fundamental drilling performance

Zhang, Suyan; Liang, Zhiqiang; Wang, Xibin; Zhou, Tianfeng; Li, Jiao; Pei, Yan; Jian, Hongchao

doi:10.1007/s00170-016-8359-0

Cited by 13 publications

(5 citation statements)

References 14 publications

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“…Based on the mathematical model proposed by Zhang [ 1 ], the mathematical model of the flank surface of the helical point micro-drill is shown in Figure 1 . X d Y d Z d is the coordinate frame built in the drill, with O d located at the drill tip, the Z d -axis coinciding with the drill axis, and the direction of X d -axis positioning the y -coordinate of the outer corner C ( y c = − t , 2 t is web thickness).…”

Section: Mathematical Model Of the Helical Point Micro-drillmentioning

confidence: 99%

“…Based on the grinding process of the helical flank and drill flute presented by Zhang [ 1 , 19 ], the micro-drill is fabricated using a six-axis CNC grinding machine (CNS7d by Makino Seiki Co., Ltd., Kanagawa, Japan), as shown in Figure 7 . The geometry of the grinding wheels and the configuration of the two wheels are shown in Figure 8 .…”

Section: Grinding Experiments Of Helical Point Micro-drills With DImentioning

confidence: 99%

“…Micro-holes have been widely applied in various fields ranging from precision mechanics to advanced electronics [ 1 ]. The micro-hole processing method mainly includes the electrical discharge machining [ 2 ], laser machining [ 3 ], helical milling [ 4 ], and drilling.…”

Section: Introductionmentioning

confidence: 99%

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Research on the Drilling Performance of a Helical Point Micro Drill with Different Geometry Parameters

et al. 2017

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During the micro-drilling process of stainless steel, the wear, fracture, and breakage of the micro-drill easily occur. Micro-drill geometry parameters have significant influence on the drilling performance of the micro-drill. Nowadays, the helical point micro-drill is proposed and its improved drilling performance is validated by some researchers. In this study, to analyze the effect of geometry parameters of the helical point micro-drill on drilling performance, the mathematical models of the helical flank and ground flute are proposed, and the cutting lip shape, rake angle, and uncut chip thickness are calculated using MATLAB software. Then, based on the orthogonal tests, nine kinds of micro-drills with different point angles, web thicknesses, and helix angles are fabricated using a six-axis CNC tool grinder, and micro-drilling experiments on 1Cr18Ni9Ti stainless steel are carried out. The drilling force, the burr height, and the hole wall quality are measured and observed. The results show that the point angle is the main contributing factor for the thrust force and burr height, and the web thickness is the main contributing factor for the micro hole wall quality. The increased point angle offers a larger thrust force, but gives rise to a smaller exit burr. A larger web thickness leads to a larger thrust force and burr height, and results in a poor surface quality. With the helix angle increased, the thrust force and burr height decreases, and the surface quality of micro-hole improves. The geometry parameters with a point angle 70°, a point angle of 40°, and web thickness ratio of 0.2 can used to improve the drilling performance of the helical point micro-drill.

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Section: Mathematical Model Of the Helical Point Micro-drillmentioning

confidence: 99%

Section: Grinding Experiments Of Helical Point Micro-drills With DImentioning

confidence: 99%

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Research on the Drilling Performance of a Helical Point Micro Drill with Different Geometry Parameters

et al. 2017

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“…There is a constructive solution based on a smooth change in the shape of clearance and the shape of the helical surface without crossing the tangent to the profile of drill axis. These tools are aimed at the quick possibility of regrinding on a simple layout of the equipment [12][13][14][15]. Typical layouts of machine tools for resharpening drills have a multi-axis movement as a rule 5 axial movement to reproduce clearance in the form of a convoluted helical surface [16].…”

Section: Introductionmentioning

confidence: 99%

New image processing algorithm to control the accuracy of sharpening drills

Pivkin

Гречишников

Ershov

et al. 2022

Emerging Imaging and Sensing Technologies for Security and Defence VII

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The geometric parameters of sharpening the rake surface are very important for the efficient use of the drill. Therefore, it is important to know the correct sharpening angle of the drill in the radial direction. This is especially important at the stage of regrinding the drill, due to the incorrect installation of the drill into the fixture. In this paper, a new image processing algorithm is proposed that allows you to set indicators and factors that determine the correct choice of the angular position of the drill after regrinding. This algorithm can be of great industrial use due to the simplicity of implementation and minimization of the necessary equipment for setting up the measuring station. The presented model has an important application value and differs from the existing ones in that it can be applied for regrinding of drills with curvilinear cutting edges. This advantage is achieved by using a simpler construction of the drill’s flank surfaces. The proposed design ensures a rational distribution of the clearance angle value along the cutting part regardless of the original shape of the flank surface before the regrinding. Taking into account the limitations of the image processing algorithm and the theoretical model of the cutting part of a tri-flute drill, a rational ratio of the rake and clearance angles obtained by simulating the edge movement in cutting process. This approach allows a radical revision of the traditional recommendations for regrinding process of tri-flute drills. This is becomes possible to solve problems associated with regrinding drills with involute and multi-level flat flank surface. However, the validity of our work still needs to be carefully checked.

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“…Their researches often focused on the cutting force, tool wear, new material, and some geometric parameters, such as point angle, helix angle, flute length to drill diameter ratio (Chyan & Ehmann, 1998; X. Huang, Chen, Wang, Zheng, & Song, 2016;S. Zhang et al, 2016;Zhaojun, Wei, Yanhong, & Lijiang, 1998).…”

Section: Introductionmentioning

confidence: 99%

Design of grinding wheel profile for new micro drill flute

Nguyen

Lee

2018

Transactions of the Canadian Society for Mechanical Engineering

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Derived from our previous research, a new micro drill bit with higher accuracy and productivity was developed. Because the drill flute plays a significant role in its cutting performance, the design of grinding wheel profile for the new micro drill flute by an inverse problem method is examined in this research. First, the cross-section of the new micro drill flute is modeled by mathematical equations. Second, machine parameters and workpiece geometric parameters are set up. Third, the engagement equation between the grinding wheel and flute surfaces is developed. Fourth, that equation is solved to obtain the locus of contact points. Finally, the translation and rotation transformations of that locus are carried out to obtain the grinding wheel profile for the new micro drill flute. Numerical examples are demonstrated and validated by Vericut software.

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Grinding process of helical micro-drill using a six-axis CNC grinding machine and its fundamental drilling performance

Cited by 13 publications

References 14 publications

Research on the Drilling Performance of a Helical Point Micro Drill with Different Geometry Parameters

Research on the Drilling Performance of a Helical Point Micro Drill with Different Geometry Parameters

New image processing algorithm to control the accuracy of sharpening drills

Design of grinding wheel profile for new micro drill flute

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