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The forced wide-opening hole type is applied in the production of elastic flat steel to create a specific wide-opening shape. This method involves two passes with a small pressing amount, resulting in greater stability compared to other techniques. However, since the 6H rolling mill is the first one after the 2# enclosure, the twisting and biting direction of the rolled material must be carefully considered. As a result, the forced wide-opening hole type is not suitable for the sixth frame. Instead, more mature technology is recommended for the seventh or eighth frames.
Due to the uneven deformation caused by the forced wide-opening hole type, the guiding system must be highly precise. After careful analysis, it was decided to use a forming process on the 7# rolling mill. This choice ensures that the roll strength and motor power meet the required standards while reducing the number of guide reserves. Considering the risk of the rolled piece running off and the possibility of cracking on the convex parts, the final hole size was designed as the upper face type II.
Because of the uneven deformation, the rolled piece tends to deviate, and the grooved hole type can cause ears to form, making it unsuitable as the first step. To improve the stability of the rolled piece, the hole type was modified. The curved groove was replaced with a flat-bottomed convex shape without a groove. Although it could still be grooved, the flat portions on both sides needed to be wider than those in the 6# rolling mill. This design helps reduce the initial processing amount for the new roll and improves roll utilization.
To prevent scratches on the rolled pieces, roller guides were imported for the 7# rolling mill. Stable roller inlets were selected to ensure smooth feeding of the material. During the production process, special attention must be paid to the installation of the inlet in the frame where the forced wide-opening hole type is used. If the inlet is not securely fastened, the rolled piece may run off and fail to enter the next rolling mill smoothly.
For the forced wide-opening hole type, the front part must be high, and the head of the rolled piece should be straight. If the head is bent, the groove can still be formed by adjusting the hole type according to the bending direction. It's important to align the center of the rolled piece as closely as possible with the center of the wide-opening hole type. The width of the rolled piece is primarily controlled by the forced wide-opening hole type frame. Throughout production, the wear and stability of the hole type must be monitored. The adjustment of the reduction in the rolling mill has the greatest impact on the width of the rolled piece.