US1467496A - Pipe-casting machine - Google Patents

Description

W. J. PERRY PIPE CASTING MAQHINE Sept. 11; 1923.

Filed April 7, 1921 Patented Septll, 1923.

UNITED S'IATIEIS PATENT orrlca.

WILLIAM J. PERRY, OF TORONTO, ONTARIO, CANADA.

nrn-ons'rme MACHINE.

Application filed April 7, 1921. Serial No. 459,403.

6 York, Province of ntario, in the Dominion of Canada, have invented certain new and useful Improvements in Pipe-Casting Machines, described in the following specification and illustrated in the accompanying drawings, that form part of the same.

The principal objects of the invention are to devise an improved method of feeding the molten metal to a rotating cylindrical mould, enabling the use of a sand lined mould and retaining a uniform surface thereby roducing a pipe ofuniform thickness an texture.

The principal feature of the invention consists in the arrangement of a rotating 2 member at the delivery end of the spout for pourin the metal whereby a rotative mo-- tion is imparted to the metal as it fiows from the spout.

The drawing represents a longitudinal section of a pipe casting machine embodying this invention.

Centrifugal pipe casting machines of various forms have been devised but up to the present it has not been found practicable to use sand lined moulds onaccount of the washing effect of the flowing metal and in using metal moulds the metal of the pipe is chilled by contact with the metal surface. The result of chilling the metal as it contacts with the metal mould is the production of a pipe of ununiform texture as it is well known that chilling of cast iron produces a short grained crystalline structurewhich naturally varies considerably in the length ofthe pipe.

In the structure herein shown the mould casin 1 is rotatably supported on rollers 2 an 3 and this casmg is lined with a suitable moulding sand 4 which is swept in a suitable manner to form the desired external shape for the pipe. In using a sand lining a spigot end may be formed as it will pull out of the sand in removing the finished pipe. A pouring spout 5 of tubular form is travelling carriage 6, and is adapted to extend axially into the mould. The spout is lined with a refractory lining 7 and is provided with a hopper 8 into which the metal is poured from the ladle 9 arranged upon the carriage.

A tubular member 10 encircles the spout I 5, being supported upon suitable anti-friction bearings 11 and 12 and this member extends beyond the pouring end of the spout and is provided with a. refractory lining 13 which forms a continuation of the spout and flares outwardly. The terminal edge of the rotatable spout member is of slightly less diameter than the inner wall of the pipe to be cast so that the metal will be delivered as close to the sand lining 4 as possible.

The member 10 is rotated in any suitable manner, a-pulley 14 being shown arranged at the end adjacent to the hopper and this is driven by a belt 15 extending around a pulley 16 carried on a shaft 17 journalled on the carriage 6 and suitably driven.

In the operation of this device, the mould is first prepared and the carriage is then operated to extend the pouring spout into the mould to its farther end.

The member 10 is caused to rotate at a. suitable speed preferably corresponding to the speed of rotation of the mould and the metal is then poured from the ladle into the spout 5. As the metal leaves the end of the spout 5 it flows over the rotating portion 13 of the member 10 and is thus directed with a whirling movement at :1 corresponding speed of rotation to that of the mould. The delivery thus achieved avoids rupture of the surface of the sand lining and the fiow will be uniform and smooth as the carriage 6 is operated to move the spout at the desired speedthe length of the mould.

The pjpethus formed will bc moulded in sand and will not be chilled, consequently the texture ofthe metal will have a tough fibrous texture which is extremely desirable.

What I claim as my invention is 1. In a pipe casting machine, the combination with a rotating mould anda nonrotatable pouring spout relatively movable longitudinally, of a rotatable member arranged at the delivery end of the spout adapted to impart a rotative movement to rigidly supported at one end on a suitable the metal flowing from the end of thespout.

2 In a pipe casting machine, the combination with a rotating mould and a nonrotatable pouring spout relatively movable longitudinally, of a tubular member rotatably encircling the spout and extending beyond the delivery end thereof, and means for rotating said tubular member. a

3. In a pipe casting machine, the combination with a rotating mould and a pourin spout relatively movable longitudinally, o a tubular member encircling said spout and spaced therefrom and extending beyond the delivery end of said spout, anti-friction bearings supporting said tubular member on said spout, and means arranged adjacent to the receiving end of the spout for rotating said tubular member.

4. In a pipe casing machine, the combination with a rotating mould and a pouring spout relatively movable longitudinally, of a tubular member rotatably encircling the spout and extending beyond the del very end thereof and having a flaring refractory lining to receive the metal from the delivery end of the spout, and means arran ed at the opposite end of said tubular member for imparting rotation thereto.

WILLIAM J. PERRY.

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