我厂有一个专门弯管子的工种,在这里压弯各种大小的管子。在弯管子以前,先要在管子中灌满砂子,砂子要灌得很紧,这样弯出的管子才不会有凹凸不平或裂纹(如图1乙)。我厂以往灌砂子的时候,是把管子竖放着,靠在一座很高的灌砂台上,在管子下部塞上木塞,上部灌入砂子。另外由一个人在管子下半部 I have a factory specializing in the work of bending pipes, bending here a variety of sizes of tubes. Before bending the pipe, first fill the pipe with sand. The sand should be tightly packed so that the bent pipe will not be uneven or cracked (Figure 1 B). In the past, when filling the sand with our factory, we put the pipe upright and leaned against a very tall sand filling station, stuffed the cork in the lower part of the pipe and poured the sand into the upper part. In addition by a person in the lower half of the tube