• Hi-Precision Punches

Ejector pins

Bangalore-based Hi-Precision Punches offers ejector pins, which are manufactured from imported materials of different grades. These ejector pins are manufactured as per DIN-1530 standards are suitable for heated pressure moulds. The cylindrical head inside the ejector traverse can adapt itself to the expansion of the mould in order to compensate for the possible centre differences in the mantle or ejector traverse. The cylindrical heads of ejector pins are robust and they can therefore withstand the stresses occurring in the mould due to the alternating pressure and ejection forces. Pins made of hot die steel having tensile strength of about 150 kg/mm^2 are suitable for die casting applications. They are capable of retaining their hardness up to about 500-550 deg C. Ejector pins having greater durability are bath nitrided to a surface hardness of 950-1,100 HV for abrasion resistance. These ejector pins find applications where the temperature does not exceed 180 deg especially in compression or jet moulding of plastics. Also the heads of these ejector pins will withstand all stresses, which result during moulding of small parts. Ejector pins are available in WPS; special alloy steels; and hot die steels. The hardness of pins of these materials are WPS: HRC 62 +/- 2; special alloy: HRC 60 +/- 2; and hot die steel: HRC 67-70 (surface hardness), and fit of shank of all these pins is g6.