我厂生产螺旋输送机螺旋轴时,为了保证螺距准确,叶片连接后,内、外螺旋线升角的正确性,我们采用了全部叶片一次热成型的加工工艺,取得了满意的效果。图1是成型后的螺旋叶片,工艺过程如下:1.下料(图2);2.将各叶片首尾依次连接成串,注意旋向(图3);3.将连接后的螺旋叶片放入箱式炉内加热到800℃左右,取出后立即拉伸致所需长度nt,冷却后将芯轴串入螺旋孔内,施行焊接。同时继续控制螺距t和总长nt,去掉工艺拉环即 In order to assure the accurate pitch and the correctness of the inner and outer helix angle, we adopted the processing technology of all the blades once thermoforming, and achieved satisfactory results. Figure 1 is a molded spiral blade, the process is as follows: 1. Cutting (Figure 2); 2. The leaves are connected in turn the first and last in a string, pay attention to spin (Figure 3); 3 will connect the spiral leaves Into a box-type furnace heated to about 800 ℃, immediately after pulling out to the required length of nt, after cooling the mandrel string into the spiral hole, the implementation of welding. At the same time continue to control the pitch t and total length nt, remove the process pull ring that