Castings for Cast-Parts

The Techmire Zinc Castings Machines

The Techmire zinc die casting machine is a multiple-slide zinc die casting machine that is capable of producing small, complex and intricate zinc castings at minimum cost. Having the capacity to produce tiny and precision zinc die castings, zinc parts, this makes Techmire zinc castings the global leader in the industry of designing and fabricating multiple-slide zinc die casting machines.

Techmire is one of the leaders in the metalworking industry today. It was founded in the year 1983 in Montreal, Canada. You will now find Techmire machines in about more than thirty countries all over the world. Techmire zinc casting machines are specifically designed for zinc. Techmire has two sets of machines. They are the NT series and the NTX series. The NT series machine uses the multiple-slide technology, being fully automatic, hot chamber and has high precision. The NXT series is an improvement of the NT series. It has the latest technology that can handle higher capacity and extreme pressures. End products of NXT series machines have better surface finish and greater part density. The NT series have three models. They are the 22 NT, the 44 NT and the 66 NT. These three machines differ in nominal die size and shot weight.

Techmire’s largest die casting machine is the 88 NTX. It has a dry cycle speed of 2,100 cycles per hour and it has a quick die-changing capability allowing change over of two-slide molds. This machine is designed for single-cavity production of large area or multiple-cavity production of small components. All NTX models offer improved functions for different ranges of products.

Cold Chamber Die Castings. Our technology had greatly improved through time; nowadays, everything is possible. One of those processes that were bought upon by technology is die castings. This refers to the procedure of forcing molten metal which is under pressure into the mold cavities. Almost all die casting is created from non-ferrous metals such as copper, zinc, magnesium, aluminum, tin and lead. This process is specially needed for applications wherein a huge quantity of small to medium parts are required and must possess a good detail, well surface state, and dimensional consistency. Zinc Castings are typically made using the hot chamber zinc die casting.

Cold chamber die casting procedure, this employ a higher-melting point alloys like magnesium and aluminum for example. Because the cold chamber is situated outside the furnace, this process calls for a means of competently moving the molten metal starting from the holding furnace down to the cold chamber. Basically, the cold chamber is located in the middle of the die and the die casting machine front platen. In transporting the molten metal, this is normally done with the help of a ladle mechanism which may be operated manually or automatically in casting aluminum alloys. In cold chamber die castings, the time consumed may vary. For small machine, it can last for 10 seconds and 2 minutes on the other hand for large machine.

Basically, cold chamber aluminum die casting is used during times when hot-chamber machines are not available. This procedure brings smooth cast surfaces and this help lessen or get rid of secondary machining operations while ensuring fast production rates.

Miniature Type of Zinc Castings

Zinc die casting is very popular among those who are in the die casting industry. Zinc is very good die casting material because of its properties. A lot of products come from zinc die casting, including golf clubs, automotive parts and hardware parts. One type of zinc die casting is the miniature zinc casting process. Miniature parts zinc castings are made with the use of a 4-slide die casting mold. The weight of production processes range from a fraction of an ounce to as much as ¾ lbs with sizes from miniscule to 4 x 4 x 1 inch. Miniature zinc casting parts can undergo die casting in a complete range of zinc alloys like Zamak 2, Zamak 3, Zamak 5 and Zamak 7. ZA-8 zinc-aluminum alloys can also be an option. Zamak is another name for Zinc.

The main reason why manufacturers use miniature zinc casting is because miniature zinc parts can undergo faster cycling and can be made on multi-slide hot chamber zinc die casting machines. Miniature zinc die casting machines have proven this new technology as the choice for highly sophisticated miniature zinc casting components. Although the technology of high-precision miniature zinc die casting process is very much alike, the hot chamber zinc die casting process of bigger zinc part types, the former is able to hold higher tolerances, usually with zero draft to “net shares” or “as cast” in faster cycles.

Zinc and ZA8 parts are developed by reducing the metal shrinkage and removing operations of pre-die casting. Automated production of zinc parts can make miniature zinc casting parts and units attain a value of pennies per piece and with tremendous low tooling investments. Plus, the lifespan of your projects can endure longer time when you use miniature zinc and ZA-8 die casting tooling.

Cold Chamber and Hot Chamber Die Castings. Die casting process basically consists of injecting molten metal under high pressure into a mold or die. It is a versatile process of creating reusable steel molds. The molds are designed to produce complex shapes with high degree of accuracy and repeatability. There are two fundamental methods in die casting, hot chamber and cold chamber.

Hot chamber die castings are used for alloys with low melting pot that do not readily attack and erode metal pots, cylinders and plungers. Typical hot chamber makes zinc parts. While cold chamber die castings are used for alloys with high melting points, most common of which is aluminum.

Cold chamber die castings employ manual method in pouring molten metal. A hydraulic operated plunger will seal the cold chamber port. Then, it forces metal into the locked die at high pressure. The machine uses a separate melting furnace and weighs several tons.

The cold chamber die casting machine is located outside the furnace, as compared to hot chamber. Thus, it requires a means of moving the molten alloy from holding furnace to the cold chamber which is attached between the die casting machine front platen and the die. Transporting the molten metal is typically done with a ladle mechanism. Cycle times can range between 10 seconds for smaller machines and up to 2 minutes for larger ones.

Cold chamber die casting is more popular in the manufacturing industry because of its cheaper production cost and durability. It may be more complex than hot chamber die casting but its dependability is more advantageous. Aluminum die castings are made using the cold chamber process.

Hot Chamber And Cold Chamber Die Casting. In the process of die casting, molten metal in injected forcibly into mold cavities, or “dies”, under very high pressure. Because this method of molding metal is extremely versatile, die casting is widely used as a method for forming metals into specific shapes. While it may use a similar process as mold casting, die casting uses pressures of up to 10 to 210mpa to inject metal into the die. The resulting material exhibits uniformity of parts, dimensional accuracy, and smooth surface finishes.

There are many different materials used in die casting, such as copper, zinc, tin, magnesium, and lead. However, aluminum die casting is the most widely used compared to these other materials as the metal is more malleable, and is good for creating large size cold chamber die castings, to die castings composed of tiny and complex parts.

There are two processes used for die casting, namely the cold chamber which produces cold chamber die castings, and the hot chamber process. To produce cold chamber die castings, a cold cylinder is injected with molten metal. With less time exposure given for the metal to be propelled into the mold, cold chamber processing is more often used for metals that easily meld with iron at very high heat. The cold chamber process is also used for metals that have high melting points.

On the other hand, in the hot chamber process, the pressure found in the die cavity connected to it becomes permanently a part of the molten material. A plunger is propelled toward an area that is non-pressurized, uncovering the inlet port appended to the pressure cylinder.