[China Aluminum Network] Caused by the extrusion die The large cap is generally caused by uneven die surface resulting in a net cut, aluminum gradually caused after the external adhesion, the following is the reason that several extrusion die may cause a large cap extrusion :
1, the extrusion die surface is not flat or a defective mouth so that there is a gap in the locking surface, aluminum turbulence. Die defect mouth to repair welding, mold surface must be flat.
2. The circumcircle of the feed cavity is too large (modulus is too short), the locked area of ​​the mold cylinder is small ------ The circumcircle of the feed cavity is the same distance from the wall of the feed tube, and the 10mm limit of the single side is not less than 5mm. A mold with a too high pressure ratio should not be simply decompressed by expanding the manifold. When using such an extrusion die, the center of the up, down, left, and right sides must be aligned to prevent the deviation of the die distance.
3, extrusion die without milling mouth, mold closing surface is too large, the unit area under the pressure value is too small - less than the outlet pressure, mold surface after running aluminum sticky cut is not net, resulting in uneven mold surface. Such a large cap is difficult to 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 dimension of the cylinder working surface. The closed area of ​​the cylinder die is small and it is also easy to damage the working surface 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, the thickness of the extrusion die is not enough, squeeze the tube 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 easily damaged and easily deformed.
6, mold sets and mold with the gap is too large, the gap inside the sticky aluminum causes the shear is not clean and the die surface is not flat. 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 the aluminum flows out from 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, it can be punched without having to increase the rod temperature. The rod is also high in temperature and easy to cap. It also limits the speed increase.
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