Development of the Straightening Process of Spring Flat Steel in Xinjiang Iron and Steel Period Chen Jin Chen Hua Zhang Haijun Xinjiang Iron and Steel Co., Ltd. Medium Profile Factory Foreword Spring flat steel is in rolling production. The spring flat steel produces a curved side and a flat curve due to the original flash of the equipment loading and adjustment. Affected product quality. And reduce the product yield. For this reason, the straightening process was determined.
2The bending flat steel of spring flat steel is divided into the side curved plane during the production process. The two sides are the curved planes of the flat steel on the horizontal plane. The wave bending refers to the bending of the flat steel on the vertical plane. . The side 1 is generally because the adjustment is not 3. The incoming material 1 is thick. The side is thin or the seam is large on the side. Causes the two sides to extend differently during rolling to bend the dairy piece to the side. The main cause of the flat bend is the difference in the instantaneous upper and lower roller speeds. The rolled flat steel is subjected to up-and-down or bottom-bending over-bottom or over-transmission joints, and the speed between the rolls is different when the gap is over-rolled. The flat steel is made to generate waves. In addition, the cold rolling of the rolling stock and the improper operation may also cause the rolling stock to bend.
3 The straightening process of the spring flat steel The cold deformation resistance of the spring flat steel is large, and the hardness of the flattened spring is increased by 2 degrees due to the straightening of the spring steel. In addition, the side of the spring flat steel is a circular arc side. It cannot be damaged during straightening.
Therefore the straightening of the spring steel. 1 art and other sections of the village slightly + the same, 3.1 spring flat steel straightening roller type design of the finished section of the spring steel is basically a rectangular shape. The advantage of using two straightening methods for flat correction is that it is convenient to feed steel.
Steel village should not be reversed. It seems that the spring flat steel is harder and the wear and tear on the side wall of the milk tank is large. In addition, since the amplitude of the side bend of the rolling stock is not large, the straightening quality is poor, and the straightening machine with a large pitch of the straightening machine has a straightening ability for a slightly larger size flattening + Straightening steel, plane-bent steel from the entrance to the two lower rolls between the easy to pull steel, so the advantage of using the vertical correction method is to overcome the shortcomings of the plane method, but the operation of feeding steel is difficult, straightening machine Adjustment is difficult. However, after using the roller ring to assist the steel turning on the steel roll, the labor intensity is greatly reduced. At the same time, through the operation training, improve the operation skills of the adjustment workers and ensure the straightening quality of the steel.
The main design considerations for the straightening and straightening rolls are as follows.
3.1.1 The radius of the arc of the roller type and the side of the spring flat steel are curved, so it should be fully considered in the design of the roller.
The radius of the bottom of the roller groove should be designed to be more than the flat steel rU. The radius of the flat side of the finished product is half the thickness of the flat steel. Chen Jin, male, 31 years old, university, engineer, Urumqi 83 (1) 22 Xinjiang Steel 3.3.1 Medium Profile Factory Co., Ltd. 3.1.2 Roller Groove Height and Slot Sidewall Slope The auxiliary groove should be determined according to the width of the flattened flat, and the side bend of the flattened flat after cold exit is determined. Large steel, when biting or correcting, easily ran out of the hole, and the nickname of the lower pharynx was larger and the value was larger; the smaller the curvature, the smaller the value of Dan. However, if the value of Dan is too large, the utilization factor of the straightening roller will be reduced. The slope of the side wall of the slot should consider the side of the spring flat steel + being scratched, the allowable degree of the plane bending of the steel after correction and the degree of plane bending before the correction. The slope of the side wall is 510.
3.1.3 Roller groove bottom width and roll table arc groove bottom width 5 shall be determined according to the actual width dimension of the flattened flatness after cooling. The side of the bomb (1) shall be flattened by the sentinel when it is set. The ruler is larger, the ear is 5=standard+, and the width of the bottom of the groove is called the flat thickness of the finished product.
The arc of the stick is mainly to prevent the occurrence of bruises when straightening and straightening the flatness. The sharing of the strands is 153.1.4. The commonness of the roll type is due to the large flat specifications. It is extremely uneconomical to fit all the specifications. It is also especially necessary, so it is necessary to fully consider the flat steel in the adjacent 5 range, the width is in the adjacent 15, and the stick type can be shared. If necessary, it can be expanded to the thickness adjacent to the adjacent width within 25 adjacent. The roller type sharing range is too large, the steel bending is not easy to straighten, and the adjustment is difficult, which will affect the straightening quality of the steel to a certain extent. For the common hole type, the value of 6 should be according to the maximum specification. 3.2 The distribution under the straightening and straightening pressure is due to the large deformation resistance of the spring flat steel after cooling. At the same time, after the steel is cooled, both the side bend and the wave bend exist, so the small deformation The correction is uncomfortable! Therefore, the use of large deformation and correction program. Considering the characteristics of the flattened steel, the No. 23 straightening roller is increased in amount to make the steel sufficiently curved, and the residual bending range is quickly shortened, and the maximum residual bending at the rear sub-section is gradually reduced. And gradually straighten the steel. It should be pointed out that due to the large deformation resistance of the spring steel, when the straightening flat specification is changed during the straightening process, the straightening machine must be re-adjusted and the straight pressure distribution determined. Otherwise, the tamper will cause damage.
3.3 The adjustment of the flattening and straightening is compared with other types of villages. The adjustment requirements are simpler but the correct adjustment is directly related to the quality of the finished steel.
3.3.1 Preparation of Straightening Roller The material of the straightening can be selected by heat-treated high-strength steel, but the spring steel is hard. The wear of the straightening roller is more severe. It is considered that the wear-resistant steel containing rare earth is ideal after practical application. The roller diameter of the straightening machine should be kept as similar as possible. If there is a difference in the diameter of the roller after the machining tolerance and repair, the roller diameter should be small to large along the direction of the steel feeding during installation, that is, the diameter of the first lower roller is the smallest, the last one. The largest diameter. In this way, the linear speed of the roller is small to large, which has the effect of straightening the steel, and the straightening of the steel does not overlap the overlap. 3.3.2 Correction of the straightening defect The main straightening defect of the flattening is bending and twisting. The type of bending is not straight due to the plane bend and the side bend. The plane is curved, the lower roller is not caused by a serious line or hole type wear, and the side bending should be adjusted according to the bending degree of the steel and the pressure of the roller. Under the general condition, the upper and lower parts are mainly increased or decreased. The pressure on the upper roller. If it is invalid, you should observe whether the pressure of each stick is reasonable.
The main cause of bruises is that the rollers are not in line, which is accompanied by bending defects. In addition, the nodulation of the rolling groove surface will also cause steel damage. At this point, the ship's place should be polished and straightened. The main reason for the flattening of the flattening is that the roller hole type is not uneven, and the pressure unevenness forms a force couple and causes twisting. When bending and torsion occur simultaneously during the adjustment process. Should be turned first. After the twisting, the misalignment of the upper and lower nipples is the main reason for the straightening of the quality defects. Therefore, after the trial is completed, the rollers should be fixed in the axial direction and carefully inspected during the production process.
4 Conclusion The bending of the spring flat steel in the process of milk cooling is adjusted by the stick, and the bending waste can be eliminated, which provides a favorable guarantee for improving the production efficiency of the flattening.
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