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Shenzhen Runpeng Precision Hardware Co.,Ltd

The contact:Susan Liao

Mobile:86-18925258235

Phone:86-755-29886925 

Fax:86-755-29886926

E-mail:sales@szrunpeng.cn

Web:www.sz-runpeng.com

Add:Building 69-70, 4th Industrial Zone, Mashantou, Gongming Town,Shenzhen,China.


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The Difference Between Forgings And Die Casting

  The difference between forgings and die casting

  die casting flange is characterized by easy access to other methods are not easy to obtain the shape of the complex parts; die casting flange low cost; can use a special process to obtain precision die castings, the surface without processing that is an ideal finish; die casting simple, Forged flange is cheap; but the die castings are prone to defects and non-dense areas, in the strong corrosion and high-pressure domestic technology generally can not guarantee the quality of forgings.

  Forging flange is the use of forging equipment for the bar forging molding, generally can not forging more complex parts, the need for larger processing, but forging flange structure is relatively dense, not prone to internal defects, so Widely used in demanding parts processing, such as valve seat, spool, stem, etc., in high pressure and strong corrosion alloy valve, forging body is also a large number of use.

  Despite the tremendous development of die casting technology and the use of computer technology to optimize the structural geometrical design of the structural design and die casting process, it is still extremely difficult to achieve Class 1 or Class 2 acceptance standards for X-ray / MT or PT quality requirements , And these are nuclear power plants, thermal power plants or petrochemical industry within the harsh environment required by the standard. So the need for welding improvement. However, after welding, the overall quality and reliability of the die casting valve becomes difficult to guarantee. Sometimes all these problems are left in the cast metal frame. The test rods are usually for each temperature, but their analysis may be uncertain. Even if the circular test rod indicates that the chemical and physical properties are acceptable, it may still be inherently imperfect to detect the inherent strength of the damage or corrosion resistance.

  Other shortcomings in the die casting valve or flange are the clear cracks and hot tuffs that occur during the solidification process under the combined effect of stress concentration in the non-uniform shrinkage and the low strength of the metal near the melting point. Lower die casting temperatures can form cold scars, and the accumulation of sand or slag in molten metal can cause blemishes. Low-level die casting operations can also cause other defects.

  die casting improvements to meet the requirements of X-ray quality depends on the defect parts of the grinding, welding, heat treatment and repeated testing and testing. Even in this case, the valve seat and washer surface or the solder tip may show a thin wire crack that needs to be reworked and machined.

  The die casting process builds fine particle structures and improves the physical properties of the metal. In the practical use of components, a correct design can make the particles flow in the direction of the main pressure.

  Forging needs to be consistent with each piece, without any porosity, excess space, inclusions or other defects. This method produces components with a high ratio of strength to weight ratio. These elements are usually used in aircraft structures.

  Advantages of Forging: The advantages of forgings are stretchable length, shrinkable cross section; retractable length, stretchable cross section; changeable length, changeable cross section. Forging the types are: free forging / hand forging, hot forging / precision forging, forging, rolling forging and forging.

  Why choose forging? Compared with die castings, the valve body of the forged valve has a more uniform structure, better density, better strength integrity, better dimensional characteristics, and smaller dimensional error. The directional construction (piping) has a higher performance over the entire strength and stress.

  (1) high strength

  Hot forging facilitates crystallization and grain refinement, allowing the material to achieve maximum possible strength and consistency, and minimal variation between pieces and pieces. The stream of particles flows precisely along the contour of the valve body, and these continuous flow lines help to reduce the incidence of fatigue or common faults.

  (2) reliability

  The forgiveness that meets the design of structural requirements has been one of the most important advantages of forgings and, to some extent,

  (3) structural integrity

  Forging eliminates internal defects, resulting in coherent metallographic organization that ensures excellent performance. In the event of severe stress and corrosion problems within the crystal, forging can guarantee a longer service life and trouble-free service.

  (4) consistency

  The uniformity of the die-forged dimensions results in complete control of the critical wall thickness, which avoids the defects caused by the displacement of the core in the die casting process. It ensures that there is no internal defect through the impact of high quality, non-separation ingot and 10,000 to 30,000 ton presses The consistent metallographic structure.


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Contact us

Shenzhen Runpeng Precision Hardware Co.,Ltd

The contact:Susan Liao

Mobile:86-18925258235

Phone:86-755-29886925 

Fax:86-755-29886926

E-mail:sales@szrunpeng.cn

Web:www.sz-runpeng.com

Add:Building 69-70, 4th Industrial Zone, Mashantou, Gongming Town,Shenzhen,China.


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