CDI2021
Innovation Department
Center for Innovation Support
Utsunomiya UniversityActivity Results Report..............................
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Center for Innovation Support since 2021

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Synthesis of enantiopure amphiphilic
helicene derivatives for application toorganized thin film chemistry2021.4.1

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2021()Synthesis of enantiopure amphiphilic helicene derivatives forapplication to organized thin film chemistry

The application of heteo-helicenes relies on the availability of their enantiopure
form and amphiphilicity in different solvents. I will synthesize helicene compounds
in enantiopure form with hydrophilic functional group(s) to give amphiphilicity, anduse them for fabrication of organized thin films on solid substrates. The amphiphilic
property is expected to increase the solubility to solvents and give the selforganization capability in solvents and/or at solid-liquid and liquid-air interfaces,
leading to expansion in application of helicenes.

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SUS30430

365nmRa(11nmRa)

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Investigation on the application of magnetic abrasive finishing processusing alternating magnetic field for finishing micro groove

Huijun XIE PD
xiehj@ cc.utsunomiya-u.ac.jp
Yanhua Zou (Associate Professor)
yanhua@ cc.utsunomiya-u.ac.jp
1. Introduction
With the development of high-tech industries such as optics, molds, semiconductors, and medicalequipment, higher surface finish of parts is required. But for micro-complex surface finishing, conventional
polishing tools are difficult to achieve. The magnetic abrasive finishing (MAF) process is a surface finishingprocess that uses a flexible magnetic brush formed by fine magnetic particles as a polishing tool [1, 2].
However, when performing complex surface finishing, the change in the gap between the magnetic pole andthe workpiece causes a change in the shape of the magnetic brush. In a static magnetic field, the shape of themagnetic brush is difficult to restore, which hinders the finishing of complex surfaces to a certain extent. In
order to overcome this problem, we proposed a MAF process that uses an alternating magnetic field. In an
alternating magnetic field, the periodic changes of the current will cause the magnetic cluster to fluctuate up
and down, which can not only continuously mix and update the abrasive, but also periodically adjust theshape of the magnetic cluster to better fit the surface of the workpiece [3].
In this paper, the application of the MAF process using alternating magnetic field to the finishing of microgrooves is discussed. The finishing experiment was carried out on the SUS304 stainless steel workpiece withgrooves of 0.3 mm deep and 1 mm wide. The surface roughness of the bottom of the groove was evaluated,
and the topography of the groove edge was observed.
2. Processing principle
Figure 1 shows the processing principle. The magnetic particles, abrasive particles, and the grinding fluid
are uniformly mixed in a certain proportion to form magnetic compound fluid. Place the magnetic compound
fluid in the tray. The magnetic particles in the magnetic compound fluid are attracted by the magnetic pole toform the magnetic cluster and carry abrasive particles to press the workpiece. The coil is supplied withalternating current to generate an alternating magnetic field. A permanent magnet is placed above the axis ofaccordingly. Furthermore, the magnetic cluster will periodically fluctuate, which helps the shape of themagnetic cluster

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ive movement between the magnetic cluster and theworkpiece can be realized by the movement of the magnetic poles, thereby realizing surface finishing.
Pole

MagnetIron

Workpiece
Magnetic particle

Abrasive particle

Grinding fluid

Working gap
PoleRotation
Tray

CoilAC power
supplyFeed movement
Fig. 1 Schematic of processing principle.
3. Experimental conditions and methods
Table 1. Experimental conditions.
Workpiece

SUS304 stainless steel plate with the size of 100 mm×100 mm×1 mm
With grooves (depth 0.3mm, width 1mm)

Magnetic particles
Abrasive particles
Grinding fluid

Oily grinding fluid (Honilo

Rotational speed of magnetic pole

350 rpm

Feed speed of mobile stage

260 mm/min

Working gap

1 mm

Gap with Pole

12 mm

Alternating current

1.9 A (Average)

Magnetic field frequency

1 Hz

Finishing time

40 min (single 10 min)

The experimental conditions are shown in Table 1. The workpiece is SUS304 stainless steel plate. The
workpiece is distributed with three grooves with a width of 1 mm and a depth of 0.3 mm. As shown in Fig.
2, the 2# groove is located in the center of the finishing area, and the 1# groove is close to the edge of thefinishing area, and the distance from the 2# groove is 10 mm. The distance between 3# groove and 2# grooveis 5 mm. The magnetic compound fluid is composed of magnetic particles with an average diameter of 149µm, WA#8000 abrasive particles, and oily grinding fluid. The working gap during finishing is 1 mm, and the

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gap between the lower magnetic pole and the upper magnetic pole is 12 mm. The current frequency is 1 Hz.
The total finishing time is 40 minutes, and the workpiece is measured every 10 minutes.
1 mm

1# 2#0.3 mm
Grooves crosssections

200

3#

2#3#100Finishing area

500Grooves

Fig. 2 Groove position.

1#

1500102030
Finishing time T (min)40Fig. 3 The surface roughness of the groove bottomchanges with time.

4. Experimental results and discussion
The experimental results are shown in Figure 3. It can be seen that the surface roughness of the bottom of
the three grooves has been improved. The surface roughness Ra of groove 1# is improved from 128.33 nm
to 51.33 nm. The surface roughness Ra of groove 2# is improved from 156.67 nm to 62.67 nm. The surface
roughness Ra of groove 3# is improved from 109.33 nm to 53.33 nm.

Edge-L

GrooveEdge-R(a) Before finishingEdge-L

GrooveEdge-R(b) After finishing

Fig. 4 Photos of the bottom and edges of the groove before and after finishing.

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Figure 4 shows the photos of the bottom and edges of the groove before and after finishing. It can be seenthat the edge of the groove is greatly improved after finishing, and the burr is completely removed. Thebottom surface of the groove has also been improved to a certain extent, but because the moving speed of themagnetic clusters in the groove is reduced, the finishing efficiency is lower than the plane outside the groove.
In order to investigate the change of the groove edge shape, the white light interferometer (ZygoNewView7000) was used to measure the groove edge shape. Figure 5 shows the 3D photos of the left andright edges of the three grooves after finishing. It can be seen that there is a slight change in the shape of thegroove edge. The edge of the groove is rounded to varying degrees after finishing. This phenomenon is more
obvious at the left edge of groove 3# and the right edge of groove 1#. However, the overall structure of thegroove is maintained well. The above results show that this process is feasible for finishing the inner surfaceof the micro grooves. At the same time, the process has a significant effect on edge deburring.

(a) 1#, Edge-L(c) 2#, Edge-L(e) 3#, Edge-L(b) 1#, Edge-R(d) 2#, Edge-R(f) 3#, Edge-R

Fig. 5 3D photos of the edges of the grooves after finishing.
5. Summary
In this paper, the application of MAF process using alternating magnetic field in microgroove finishing isdiscussed. The experimental results show that this process can finish the surface of the microgrooves and has
excellent finishing effects on the edges of the grooves.
References
1) Wang Y, Hu DJ (2005) Study on the inner surface finishing of tubing by magnetic abrasive finishing.
-492) Shinmura T, Takazawa K, Hatano E, Matsunaga M, Matsuo T (1990) Study on Magnetic Abrasive
Finishing. CIRP Ann-3283) Zou YH, Xie HJ, Dong CW, Wu JZ (2018) Study on complex micro surface finishing of alumina ceramicby the magnetic abrasive finishing process using alternating magnetic field. Int J Adv Manuf Technol
97(5--2202CDI.

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Hiroyo UEHARA PD
huehara@ cc.utsunomiya-u.ac.jp

Toshimori TAKAHASHI Professorttaka@ cc.utsunomiya-u.ac.jp.

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