AddDoFeed Doubled Productivity for Face Grooving of Molds

By Bhalchandra Chorghade, Editor, CNCTimes.com

Creative Technology Co. is a leading plastic mold company in Japan that has been in operation for 45 years now. The company specializes in design and production of molds used for large plastic parts in automobiles. Their special injection molding machines allow the company to test and evaluate the molds and offer integrated services to their customers.

In 2019, Mr. Yamanaka, a director of Creative Technology Co., asked us to help them with a major reformation on their production floor.

The recent trend in the molding industry is “short-term delivery and high quality.”

When Mr. Yamanaka joined the company many years ago, the production of large molds had a delivery time of about one year, but now they’re asked to complete the same job in two to three months partly due to rapidly changing automobile designs. In addition, the strength of the mold itself has been enhanced through materials such as pre-hardened steels, which means it has become increasingly difficult to machine molds nowadays. Moreover, the shapes of the automobile components are now very complicated with required precision being high. All these conditions challenge the company to quickly produce molds in extremely high quality.

To deal with such market changes and customer demands, the company embarked on a series of reformations aiming to reduce machining time by 30% without sacrificing precision.

There are approximately 200–300 holes made in each mold, and until now, they had been machined using a HSS drill. Therefore, we proposed DeepTri-Drill, an indexable gun drill for deep hole-making operations, to drastically increase the efficiency of their machining process.

DeepTri-Drill achieves equivalent roundness, straightness, and surface roughness as the gun drill, and its cutting edge with build-in chip splitter and wiper split the chips into small segments to reduce cutting resistance and enable smooth chip evacuation.

Our proposal resulted in 90% decrease in the machining time, and tasks that previously took three to four days could now be completed over night.

Based on this huge success, Mr. Yamanaka further consulted with us on the reformation of their milling processes.

It is a common practice to cut grooves on the side of the plastic molds to prevent water droplets, generated during rapid cooling, from going into the product.

At Creative Technology Co., grooves of width and depth of approximately 10 mm were machined using a solid end mill, but the long processing time proved to be a bottleneck. Furthermore, as solid end mills tended to break spontaneously, it was necessary to have an operator stay with the machine during the cutting process.

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