NEED HELP FOR YOUR NEXT PROJECT?
Please fill in the form below and our professionals will contact you within 12 hours! For a more prompt reply, you may reach us by phone call or WhatsApp: +86 136 9425 7500.
5 Reasons of Cold Shut of Aluminum Die Casting Parts

5 Reasons of Cold Shut of Aluminum Die Casting Parts

5 Reasons of Cold Shut of Aluminum Die Casting Parts



1) What is the cold shut of aluminum casting parts?

  The gap where metal flows butt or overlap but not merge is called cold shut. The main feature is the obvious, irregular, and sunken linear lines, the shape is small and narrow, and some junction edges are smooth and may be broken. The area where the cold shut occurs in aluminum alloy die castings are usually the area far from the gate. It is due to the fact that when the metal flow is divided into several strands, the flow front of each strand has been in a condensed state (called the solidification front), but under the push of the subsequent metal flow, it is still filled. When the metal stream that it meets also has a solidification front, the solidified layer that meets can no longer be fused, and the joints appear gaps. Severe cold shut has a certain hindrance to the use of castings, which should be determined by the use conditions of the castings and the type of cold shut.


2) Why the cold shut will be caused in aluminum die casting parts:

  • The molten metal pouring temperature is low or the mold temperature is low.

  • The alloy composition does not meet the standard and the fluidity is poor.

  • The molten metal is filled in separate runners, resulting in poor fusion.

  • The gating design is improper and the filling process is too long.

  • Low filling speed or poor exhaust.


3) How to improve the cold shut:

  • Properly increase the pouring temperature and mold temperature.

  • Change the alloy composition to improve fluidity.

  • Improve the gating system, increasing the speed of the inner gate, and improving the filling conditions.

  • Improve the overflow conditions and increase the overflow flow.

  • Increase injection speed and improve exhaust conditions.

  • Increase the specific pressure.


Related News
  • 7 Requirements of Die-Casting Aluminum Alloy Material

    7 Requirements of Die-Casting Aluminum Alloy Material

    Aluminum alloy die-casting products are mainly used in electronics, automobiles, motors, and some telecommunications industries. Some high-quality, high-precision, high-toughness, high-quality alumi...
  • The Performance and Application of Aluminum Alloy Die Casting

    The Performance and Application of Aluminum Alloy Die Casting

    Aluminum alloy die castings have many advantages than other castings, such as good surface, lightweight, corrosion resistance, etc., especially in automobile lightweight, aluminum alloy castings hav...
  • EMP Exhibits in The 2019 AAPEX Show

    EMP Exhibits in The 2019 AAPEX Show

    The AAPEX Show takes place from November 5th to November 8th, 2019 at the Las Vegas Convention Center located at 3150 Paradise Road, Las Vegas, NV 89109. As an IATF certified aluminum die casting part...