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The six methods of precision casting energy saving production
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The six methods of precision casting energy saving production

Views: 1     Author: Site Editor     Publish Time: 2018-05-14      Origin: Site

H2. As we all know, at ordinary times in the casting, accidentally will produce the die. The formation of scrap not only delays the staff's time, but also wastes the material of the module. But now advocate of saving energy production in China, under the influence of national policy, now many of the precision foundry industry structure change on the energy conservation and environmental protection, the energy saving in the precision casting production what are the considerations, the following conclusion: a total of six

H3. 1. Improve the production rate of precision casting parts by optimizing design and optimization process. On the premise of guarantee the quality of precision castings, change the gating system, using heat insulating riser can often increase exports, if we can increase the export rate from 60% to 60%, can reduce energy consumption by 14.3%.

H4. 2. Adopt high compactness molding machine and modern core technology to minimize casting quality and reduce machining allowance. It is proved that the high pressure molding can reduce the casting quality by 3-5%, and the machining allowance can be kept at 2-3mm. Reducing weight not only makes the precision casting shop energy efficient, but also reduces the energy consumption of the subsequent processing.

H5. 3. Adopt energy-saving technological process and rationally organize production. For example: use self-hardening resin sand or surface dry type to replace clay sand drying, saving the energy consumption of baking mold; To eliminate the graphitization annealing process by eliminating the white or hard points on the castings in the casting state by strictly applying the ingredients, determining the appropriate components of precision castings and taking effective inoculation schemes. To promote the cast iron, it is required that the elongation under 12% should be obtained under the casting condition. It is possible to use frequency wave harmonic vibration aging process to remove the thermal aging process.

4. Save materials and try to reuse them. Because the production of any material needs energy.

5. Precision casting enterprise scale production, i.e., the output of each casting unit is above 5000t. Because of the large output of the enterprise, the working time of the furnace is long, and the heating energy of the furnace itself is amortized to the energy consumption per ton of precision castings.

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  • What is 'multiple certification'?

    This is where a batch of steel meets more than one specification or grade. It is a way of allowing melting shops to produce stainless steel more efficiently by restricting the number of different types of steel. The chemical composition and mechanical properties of the steel can meet more than one grade within the same standard or across a number of standards. This also allows stockholders to minimise stock levels.

    For example, it is common for 1.4401 and 1.4404 (316 and 316L) to be dual certified - that is the carbon content is less than 0.030%. Steel certified to both European and US standards is also common.

  • What surface finishes are available on stainless steels?

    There are many different types of surface finish on stainless steel. Some of these originate from the mill but many are applied later during processing, for example polished, brushed, blasted, etched and coloured finishes.

    The importance of surface finish in determining the corrosion resistance of the stainless steel surface cannot be overemphasised. A rough surface finish can effectively lower the corrosion resistance to that of a lower grade of stainless steel.

  • Can I use stainless steel at high temperatures?

    Various types of stainless steel are used across the whole temperature range from ambient to 1100 deg C. The choice of grade depends on several factors:

    1. Maximum temperature of operation
    2. Time at temperature, cyclic nature of process
    3. Type of atmosphere, oxidising , reducing, sulphidising, carburising.
    4. Strength requirement

    In the European standards, a distinction is made between stainless steels and heat-resisting steels. However, this distinction is often blurred and it is useful to consider them as one range of steels.

    Increasing amounts of Chromium and silicon impart greater oxidation resistance. Increasing amounts of Nickel impart greater carburisation resistance.

  • Can I use stainless steel at low temperatures?

    Austenitic stainless steels are extensively used for service down to as low as liquid helium temperature (-269 deg C). This is largely due to the lack of a clearly defined transition from ductile to brittle fracture in impact toughness testing.

    Toughness is measured by impacting a small sample with a swinging hammer. The distance which the hammer swings after impact is a measure of the toughness. The shorter the distance, the tougher the steel as the energy of the hammer is absorbed by the sample. Toughness is measured in Joules (J). Minimum values of toughness are specified for different applications. A value of 40 J is regarded as reasonable for most service conditions.

    Steels with ferritic or martensitic structures show a sudden change from ductile (safe) to brittle (unsafe) fracture over a small temperature difference. Even the best of these steels show this behaviour at temperatures higher than -100 deg C and in many cases only just below zero.

    In contrast austenitic steels only show a gradual fall in the impact toughness value and are still well above 100 J at -196 deg C.

    Another factor in affecting the choice of steel at low temperature is the ability to resist transformation from austenite to martensite. 

  • Is stainless steel non-magnetic?

    It is commonly stated that “stainless steel is non-magnetic”. This is not strictly true and the real situation is rather more complicated. The degree of magnetic response or magnetic permeability is derived from the microstructure of the steel. A totally non-magnetic material has a relative magnetic permeability of 1. Austenitic structures are totally non-magnetic and so a 100% austenitic stainless steel would have a permeability of 1. In practice this is not achieved. There is always a small amount of ferrite and/or martensite in the steel and so permeability values are always above 1. Typical values for standard austenitic stainless steels can be in the order of 1.05 – 1.1. 

    It is possible for the magnetic permeability of austenitic steels to be changed during processing. For example, cold work and welding are liable to increase the amount of martensite and ferrite respectively in the steel. A familiar example is in a stainless steel sink where the flat drainer has little magnetic response whereas the pressed bowl has a higher response due to the formation of martensite particularly in the corners.

    In practical terms, austenitic stainless steels are used for “non-magnetic” applications, for example magnetic resonance imaging (MRI). In these cases, it is often necessary to agree a maximum magnetic permeability between customer and supplier. It can be as low as 1.004.

    Martensitic, ferritic, duplex and precipitation hardening steels are magnetic.

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