What are the causes of the large caps?
[China Aluminum Network] Caused by the extrusion die is generally caused by a large cap die surface is not smooth resulting in shear is not clean, aluminum gradually caused after the outer adhesion, the following are several reasons for the extrusion die may lead to extrusion cap:
1. The extrusion die face is uneven or has a defect opening to make the locking surface have a gap, aluminum turbulence. Die defect mouth to repair welding, mold surface must be flat!
2. The circumcircle of the feed cavity is too large (dragging too short), the locking area of ​​the mold cylinder is small - the distance between the circumcircle of the feed cavity and the wall of the feed tube is 10mm at the limit, and the limit is not less than 5mm. The extrusion ratio is too high. The mold should not simply be relieved by expanding the shunt cavity. When using such an extrusion die, the center of the upper, lower, left, and right sides must be aligned to prevent the deviation of the module from occurring again!
3. There is no milling port in the extrusion die, the die closing surface is too large, and the pressure value per unit area is too small—less than the outlet pressure. The die surface is not clean after aluminum aluminum sticking, causing the die surface to be uneven. This kind of big hat is hard to do clean! Note that the cylinder surface should be properly coated with aluminum and the aluminum of the die surface can be cut off several times. The die can be coated with oil at the indentation of the cylinder so that the die surface can run aluminum without sticking to the die. ! Even if there are occasional small flashes, even success.
4. The size of the nozzle of the extrusion die is smaller than the size of the cylinder face, and the closed area of ​​the cylinder die is small, and it is also easy to damage the face of the cylinder. Note that when the small machine mold is refitted to a large machine, the die outlet diameter is the same as the diameter of the large cylinder working face.
5. Extrusion die thickness is not enough, the squeeze tube force on the die set! The thickness of the mold and the mold sleeve must conform to the principle of the first 3 after the first 3, that is, the mold guide surface must protrude 1 mm from the mold sleeve. - The die set will never be directly subjected to the extrusion force, otherwise, the die set will be vulnerable to deformation.
6. The clearance between the mold sleeve and the mold is too large, and the sticky aluminum in the gap causes the shear to be not clean and the mold surface to be uneven. This situation is generally common in molds that have been modified from small machines.
7. The extrusion ratio is too high, the outlet resistance is greater than the extrusion force, the locking surface is uneven, and aluminum flows out of the locking surface. In most cases, boring cars may occur, and the rod temperature, mold temperature, and barrel temperature may be appropriately increased. If necessary, the mold sets and even gaskets can be heated and processed on the machine. At the same time, the length of the bar can be shortened and the length can be reduced. When the aluminum rod is too short, the stamping can be produced without increasing the rod temperature blindly. The rod is also high in temperature and easy to cap. It also limits the speed increase!
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