On the Lubricants and the Formability of Steels for Cold-Hubbing

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  • 鋼のコールドハビング用潤滑剤と各種鋼の変形抵抗について
  • コウ ノ コールドハビングヨウ ジュンカツザイ ト カクシュ コウ ノ ヘンケイ テイコウ ニ ツイテ

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Abstract

A method for producing steel-dies by cold-hubbing has been recently developed. In this method, some important problems remain unsolved on lubricants and tools, because steels have a high resistance to forming. In this report, the results of investigation on the effects of coatings and lubricants are described and also the results on the hubbing depths are compared and discussed for several steels, using a hardened W-Cr tool steel and a sintered carbide alloy as the hub materials. The lubricating properties were shown by the frictional force per unit contact area in the steady state of hubbing operation. Manganese phosphate was the most excellent as coating on the work steel. Molybdenum disulphide, stearate of divalent metals and wax such as stearil-alcohol were effective as the lubricants by co-operating with suitable coatings. The resistance to forming in plain carbon steels increased linearly with the carbon content, but in alloy steels it was higher than in plain carbon steels of the same carbon content. The commercially pure iron made by L.D. converter method had very low resistance to forming, and this material is to be noticed as the excellent cold-forming material. Even the high-resistance materials to forming, such as tool steels in annealed state, could be hubbed more than 40 mm in depth in one stroke. In such a case, however, the hub materials that can endure the pressure not less than 450 kg/mm2 must be used.

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