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Die casting machines

there are several types of die casting machines in use today most of these machines are hydraulically actuated and operate horizontally but vertically operating machines are also utilized the principal difference between vertical and horizontal die casting machine is as the terms imply the direction of metal injection into the dark all die casting machines include a metal injection system to get the metal in the died and a clamping system to keep the dye has closed during injection.
            the two principal types of die casting machines are the hot chamber and cold chamber type the chamber machine is used mainly for die castings zinc and other metals of low melting temperature however it is also used to die-cast magnesium.
             the machine shop to charge and has a holding power which is a reservoir for the molten metal seated in a furnace and an injection system for transferring the metal through a gooseneck shaped pipe to the die the plunger end of the injection system and the lower portion of the transfer price are submerged in the molten metal for this reason aluminum and copper alloys are unsuitable for use since they chemically attack order road the submerged injection system.
             when the plunger rises buck charge of metal enters the pipe through a port when the plunger descends it closes the port and drives the charge through a nozzle at the end of the pipe and into the die.
          injection pressures may range from fifteen hundred to more than forty five hundred pounds per square inch or ten to thirty one mega Bascales.                the cold chamber machine is used primarily to die cast the aluminum magnesium and copper alloys in the cold chamber machine the charge is supplied by ladle or feed system from its external furnace source to a holding pot at the shop of the machine the feed system components are not submerged in the molten metal the charge is poured ahead of the plunger tip through a poor hole in the shots leave as the plunger advances it closes the poor hole and drives the molten metal into the die injection pressures may arrange to ten thousand pounds per square inch shorter sixty-nine mega bascales  for aluminum and magnesium although some machines can provide still greater pressures
          after the metal in the dies solidifies and the dies have separating the plunger thrusts forward extending the plunger tip past the cover die this pushes the biscuit that solidifies at the end of the shots leave assisting casting release.
        dies are usually produced from hot work tools stels mold steel maraging steels and to a lesser extent refractory metals such as tungsten and molybdenum  alloys all tooling materials are noted for high hot strength and high temperature where resistance .
     dies are usually made by machining from blocks of rock metal but they also can be cast in machine because of their machine features precision and materials used die casting tooling is expensive but the died as a reusable for thousands or even hundreds of thousands of parts but covered i have contains a port for entry of the molten metal from the metal injection system the ejector die half usually contains the channels called runners through which the molten metal flows to reach the gate or gates at the die cavity.
            dies are typically single cavity or multiple cavity dies multiple cavity dies are usually used for multiple identical parts however they also can be used to produce parts of different design and if so they are commonly called combination dies because such dyes are often used to cast parts that will be assembled together they are also called family dies meaning dies for a family of parts.
              cores fixed or movable  either die half are used to cast holes in various directions fixed cores are in line with the direction in which the die halves open those for holes in other directions are retractable on moving slides also called core polls to move in out with the shut inserts placed in position before each shut also can be used to cast complex features or to be cast in place as an enter grow casting feature .to minimize porosity in the casting the dye halves have vents to release the air that is pushed ahead of the metal shot overflow channels in the dive blocks catch surplus metal they also assist inventing and provide locations of the casting for its objection.
           built into the die blocks are cooling lines circulating water or oil dissipate the heat of the molten metal at a precise rate cooling it a controllable pool in flow rate is important because it controls the metal solidification rate
          an ejector system is required to release the casting in the system ejector pins are mounted between ejector plates in a pocket on the objector side of the die in most cases they are activated by numatic or hydraulic cylinders.
           to facilitate casting ejection dies and cores incorporate a slight draft or taper the amount depending on the metal to be cast in general the lower the metals melting temperature the less the draft require


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