ASUKAALUMINIUMNEWS NO. 653 NOVEMBER 2015
Asuka Seminar opens on a large scale
The 52nd Asuka Seminar was grandly held on October 9 and 10 at the Kira Kanko
Hotel in Mikawa Bay National Park. Eighty customers of Asuka’s products wereinvited and the all attendants devoted themselves to the informative seminar, which
was summarized as follows. The photo on page two is Mr. Suguru Takeda lecturing ona stage.
The ABC of diecast, from basis to new technology
Mr. Suguru Takeda, Engineering Senior AdvisorAhrety Corporation(1) Introduction“Diecast” is one of the permanent mold casting processes, and its products are also
called “diecast”. Today, we can get various accurate and smooth surface products bydiecat. The merits of diecast are,accurate dimension
beautiful and smooth surface
thin and light weightdelicate metallurgic structure
reduction of machining
high productivity
high recycling performanceContrarily, the weak points of diecast are,many casting defectionsdifficulties of welding & heat treatment
difficulty of undercut
hard option to choice various alloys
unfit for smaller quantity production(2) Influenced factors for products
There are many factors, the velocity of cooling, the metallurgic structure,theccastig
defects, the constitution of molten elements and the quality of molten metal. These
give any affects against the physical or chemical quality.
The chill layer on the surface of cast has a good physical quality. When themachining process shave it insensitively, the elongation and tension get lower.
The temperature of mold is very delicate and important. The lower temperature,
100 degree under, invites shrinkage cavity and porosity, and on the contrarily, thehigher temperature of mold invites soldering mark. The control of the fittest moldtemperature for respective products is important.
(3) New process of diecasting<A> Laminar flow diecasting
The molten metal is filled slowly, and solidified with high pleasure quickly. The
product has fewer gas and porosity, and its dimension is accurate.
<B> Squeeze diecasting
The molten metal is filled slowly with high pressure, which is kept till solidification.
The product has fewer gas, and has excellent dimension.
<C> Vacuum diecasting
The cavity is decompressed or being vacuum, and the molten metal is casted. The gas
faulty and misrun is few. However it is necessary to set up special mold anddecompressing system.

<D> Semisolid diecasting
The molten metal is casted under semisolid condition. The product has fewer shrink
marks and segregation, and high strength. The greatest problem of conventional
product is gas porosity, but semisolid diecast can over this weak point.
Above these new diecasting systems need some special molds and apparatuses, andcasting cycle is longer. Therefore, we have to study so many problems to improvevarious engineering.
(4) New alloys for diecast
Today, our ordinary diecasted product has an elongation of 1.5%, which restricts
its large usage. To overcome this weak point and to increase its use, various alloys areunder development today.
<A> High tension alloy
Al-Si-Mg alloy
for suspension
Al-Mg-Mn allyfor body frame<B>Abbreviation of heat treatment process<C> High thermal condition alloy for CPU case, motor and battery case of hybrid
electric vehicle(5) Our target
Today, we have so many tasks, to make larger size or processing less diecast. These
many requests shows us a hopeful future of diecast industry, I think. Aiming theexpansion of diecast market, we have to develop continuously for our users as
follows,
Higher reliability
Diversification of materials
Higher function
Grand party opens generously
After Mr. Takeda’s fruitful seminar, a grand party was held in traditional Japanesefashion as the photo on page three shows, where all attendants enjoyed themselves theautumn taste in Mijawa Bay.
Then they moved to Night Salon to have a very good time, singing Karaoke andtasting mellow drinks thoroughly until midnight. At night, an open-air bath wasfavorably reviewed, looking at whole Mikawa Bay.
Company news
Nagoya City executes the education program for the health committee throughWard Environmental Service Office. On 15 October, 20 members of the health committee from Minami Ward Environmental Service Office visited us to study aluminum
recycling. They watched a video on aluminum can recycling, and then observed actual
process of recycling. They were the second observation party from Minami Ward
Environmental Service Office. The photo on page four is the observation group.
Next morning of the Seminar, a golf competition was held customarily. Winners are,First prize Mr. Takashi Harada (Toyotsu Material Incorporated)
2nd. prize Mr. Hideichiro Maruyama (Mitsubishi Trading RtM Japan)
3rd. prize Mr. Ryozo Takiya (Kozakai Alloy Indudtry)
B.B.prize Mr. Koichi Arima (Asuka Industries Inc.)
Congratulations every one! Let us fight here next again.