コーティング金型の熱処理変形低減の検討 −形状測定と熱処理シミュレーションによる熱ひずみの緩和−
■機械金属部 谷内大世 藤井要 舟木克之 根田崇史
熱処理シミュレーションでは，これまでに鋼軸や歯車などの単一素材の機械部品を対象に、変形低減の取組が行われてきたが，コーティングした製品の変形低減については報告事例がない。そこで，本研究では中空円柱形状の金型(SKD11)に熱CVDによるTiN膜をコーティングした際に生じる変形の原因とその低減方法を三次元測定機と熱処理シミュレーションを用いて検討した。その結果，(1)初期の熱処理条件で生じた変形は，形状測定結果より鼓型と樽型の複合変形であった。(2)シミュレーション結果より，変形の原因は主に熱ひずみであることが確かめられた。(3)熱ひずみを緩和する条件でコーティングを行った結果，変形量が10mm以下に低減できた。
キーワード: 変形低減，コーティング，熱処理シミュレーション，形状測定，熱ひずみ
Investigation of Reduction in Distortion of Dies due to Heat Treatment Coating
- Decrease of Heat Strain Based on the Results of Shape Measurement and Heat Treatment Simulation -
Taisei YACHI, Kaname FUJII, Katsuyuki FUNAKI and Takashi KONDA
Heat treatment simulation has been carried out with the aim of reducing distortion of machine parts made of a single material, such as steel shafts and steel gears. However, there have been few reports on cases of reduction of distortion in coated products. In this study, the causes of distortion and a method for reduction of distortion were investigated for a hollow cylindrical die (SKD11) coated with TiN film by thermal CVD. A coordinate measuring machine was used for measurement, and heat treatment simulation was conducted. The results are as follows: (1) the measurement clarified that the distortion caused under the first coating condition was a combination of an hourglass-shaped distortion and a barrel-shaped distortion; (2) the simulation proved that the main cause of distortion was heat strain; (3) when the coating experiment was conducted with a lower heat strain, the distortion was reduced to less than 10μm.
Keywords : reduction of distortion, heat treatment simulation, shape measurement, heat strain
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