Centrifugal casting of molten silicate(s) to mfr. pipes - where insulation retards cooling of pipe ends to avoid defects (CS 29.7.77)

摘要

Machine for the centrifugal casting of pipe from molten silicates, where a mould is moved on a trolley to between a stationary headstock, and a tailstock which is driven axially by work cylinders via springs, to clamp the mould between the stocks. Each stock is provided with a clamping plate fitted with a hollow clamping ring; the outer dia. of the ring is conical, and the ring is filled with thermal insulation. The headstock contains a driven spindle which rotates the mould; and the thermal insulation prevents both ends of the cast pipe from cooling too rapidly. The thermal insulation is pref. mineral wool; and the ratio of the wall thickness in the middle of the mould, so compared with the mould ends, is pref. 1:0.9. cup springs are pref. used between the work cylinders and the tailstock. Used esp. to mfr. pipes 1 metre long and 150-450 mm dia., to prevent cracking and/or vitrification of the ends of the pipe, by ensuring uniform cooling conditions along its entire length.