factory customized Bus Electric Car Shell for Slovenia Factory
Company Core Philosophy
The company is specialized in casting mould technology design, tooling development, mould making,gravity casting aluminum alloy products, machining service as a whole, and has 36 seniorr&dengineers. 20 years experience in professional mould making.Strong technical team with certain research and development capabilities.Full machinery focus on quality and after-sales service.
Payment & Delivery
Payment Terms: 30% for deposit, 70% before shipment.
Package Details: usually use the standard 1200*800mm wood pallet, but can customized packaging according to the different products.
Delivery： 45 days after order confirmation.
There are 4 workshops in the company which including tooling workshop, casting workshop , machining workshop ,cleaning workshop and one full-equipped laboratory.
China Foundry Expo
Participate in China Foundry Expo every year.
Q:Plant Maturity – Years in service?
Q:Project Management is existed for new production?
Q:Ownership – Main Share Holders?
Q:Export License and/ or Experience?
Q:Products Development time?
Q:Products Cycle time ?
We stick to the principle of "quality first, service first, continuous improvement and innovation to meet the customers" for the management and "zero defect, zero complaints" as the quality objective. To perfect our service, we provide the products with the good quality at the reasonable price for factory customized Bus Electric Car Shell for Slovenia Factory, We welcome customers, business associations and friends from all parts of the world to contact us and seek cooperation for mutual benefits.
What is PERMANENT MOLD CASTING? What does PERMANENT MOLD CASTING mean? PERMANENT MOLD CASTING meaning – PERMANENT MOLD CASTING definition – PERMANENT MOLD CASTING explanation.
Source: Wikipedia.org article, adapted under https://creativecommons.org/licenses/by-sa/3.0/ license.
Permanent mold casting is a metal casting process that employs reusable molds (“permanent molds”), usually made from metal. The most common process uses gravity to fill the mold, however gas pressure or a vacuum are also used. A variation on the typical gravity casting process, called slush casting, produces hollow castings. Common casting metals are aluminium, magnesium, and copper alloys. Other materials include tin, zinc, and lead alloys and iron and steel are also cast in graphite molds.
Typical products are components such as gears, splines, wheels, gear housings, pipe fittings, fuel injection housings, and automotive engine pistons.
There are four main types of permanent mold casting: gravity, slush, low-pressure, and vacuum.
The gravity process begins by preheating the mold to 150–200 °C (300–400 °F) to ease the flow and reduce thermal damage to the casting. The mold cavity is then coated with a refractory material or a mold wash, which prevents the casting from sticking to the mold and prolongs the mold life. Any sand or metal cores are then installed and the mold is clamped shut. Molten metal is then poured into the mold. Soon after solidification the mold is opened and the casting removed to reduce chances of hot tears. The process is then started all over again, but preheating is not required because the heat from the previous casting is adequate and the refractory coating should last several castings. Because this process is usually carried out on large production run work-pieces automated equipment is used to coat the mold, pour the metal, and remove the casting.
The metal is poured at the lowest practical temperature in order to minimize cracks and porosity. The pouring temperature can range greatly depending on the casting material; for instance zinc alloys are poured at approximately 370 °C (698 °F), while Gray iron is poured at approximately 1,370 °C (2,500 °F).
Molds for the casting process consist of two halves. Casting molds are usually formed from gray cast iron because it has about the best thermal fatigue resistance, but other materials include steel, bronze, and graphite. These metals are chosen because of their resistance to erosion and thermal fatigue. They are usually not very complex because the mold offers no collapsibility to compensate for shrinkage. Instead the mold is opened as soon as the casting is solidified, which prevents hot tears. Cores can be used and are usually made from sand or metal.
As stated above, the mold is heated prior to the first casting cycle and then used continuously in order to maintain as uniform a temperature as possible during the cycles. This decreases thermal fatigue, facilitates metal flow, and helps control the cooling rate of the casting metal.
Venting usually occurs through the slight crack between the two mold halves, but if this is not enough then very small vent holes are used. They are small enough to let the air escape but not the molten metal. A riser must also be included to compensate for shrinkage. This usually limits the yield to less than 60%.
Mechanical ejectors in the form of pins are used when coatings are not enough to remove casts from the molds. These pins are placed throughout the mold and usually leave small round impressions on the casting.
Slush casting is a variant of permanent molding casting to create a hollow casting or hollow cast. In the process the material is poured into the mold and allowed to cool until a shell of material forms in the mold. The remaining liquid is then poured out to leave a hollow shell. The resulting casting has good surface detail but the wall thickness can vary. The process is usually used to cast ornamental products, such as candlesticks, lamp bases, and statuary, from low-melting-point materials. A similar technique is used to make hollow chocolate figures for Easter and Christmas.
The method was developed by William Britain in 1893 for the production of lead toy soldiers. It uses less material than solid casting, and results in a lighter and less expensive product. Hollow cast figures generally have a small hole where the excess liquid was poured out.
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