| 滚筒制造工艺 |
| 添加时间：2019/4/19 14:25:36 浏览次数： |
| 滚筒制造工艺:一般在滚筒的主轴方面，按受载情况，可以分为以下两种：1)心轴只承受弯矩，如改向滚筒组的轴；2)转轴同时承受弯矩和扭矩，如传动滚筒组的轴；轴的材料一般是经过轧制或锻造的碳素钢或合金钢，通常的材质是中碳钢，四十五号钢最为常用的，对于受力较大且尺寸受到限制的轴，以及某些特殊要求的轴可用合金钢，选用材质为四零铬，根据需要，轴一般需经过热处理或表面强化处理，以提高其力学性能和耐磨性等，在一般温度下，合金钢和碳素钢的弹性模量相差很小，故采用合金钢不能提高轴的刚度；轴的材质方面一般会经调质处理，对于传动滚筒组，当轴强度指标不满足要求时也可选择合并经调质处理，并按对称循环弯曲许用应力校核；筒皮设计技术要求为：1)筒皮卷曲时必须顺着钢板的轧制方向；2)接头处的错边量不大于1毫米；3)滚筒包胶后的纵向焊缝必须进行超声波或X射线探伤检查：①超声波探伤进行10%，焊缝达到标准中的二级；②射线探伤从一端开始探总长度的20%，焊缝达到国标二级，如不合格探伤长度加倍，加倍仍不合格则进行全长探伤，直至符合要求；4)筒皮卷好后的圆度公差应不超过0.5；5)材质：Q235型钢，屈服强度为235牛/平米；对于中型滚筒组及轻型滚筒组，当轮毂处外径大于220mm时，用铸钢，对于轻型滚筒组，当轮毂外径小于220mm时，采用热轧圆钢，应符合国家标准 Drum manufacturing process: generally in the main shaft of the drum, according to the loading situation, it can be divided into the following two kinds: 1) the spindle only bears bending moment, such as the axis of the reversed drum group; 2) the rotating shaft bears both bending moment and torsion, such as the shaft of the transmission drum group; the material of the shaft is generally rolled or forged carbon steel or alloy steel, usually medium carbon steel, 45 steel is the most commonly used material; For axles with large force and limited size, and axles with special requirements, alloy steel can be used. The material chosen is 40chromium. According to the need, axles usually need heat treatment or surface strengthening treatment to improve their mechanical properties and wear resistance. At general temperature, the elastic modulus difference between alloy steel and carbon steel is very small, so the stiffness of axles can not be improved by using alloy steel. The material of the shaft will be tempered generally. For the transmission drum group, when the strength index of the shaft does not meet the requirement, it can be combined with the tempered treatment and checked according to the allowable stress of symmetrical cyclic bending. The technical requirements of drum skin design are as follows: 1) the rolling direction of the steel plate must be followed when the drum skin is curled; 2) the wrong edge at the joint is not more than 1 mm; 3) the longitudinal weld after the drum is glued must be used. To carry out ultrasonic or X-ray flaw detection: 1) 10% of ultrasonic flaw detection, and the weld seam reaches the second level of the standard; 2) 20% of the total length of radiographic flaw detection from one end, and the weld seam reaches the second level of the national standard. If the length of unqualified flaw detection is doubled and doubled, the full-length flaw detection will be carried out until it meets the requirements; 4) The roundness tolerance of the rolled drum shall not exceed 0.5; 5) Material: Q235 steel. For medium and light drum groups, when the outer diameter of hub is greater than 220 mm, cast steel is used, and for light drum groups, when the outer diameter of hub is less than 220 mm, hot rolled round steel is used, which should meet the national standards. |
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