Shengzhou Hongrui Refrigeration Technology Co., Ltd
Tel：86-13857581028 E-mail：hweif@139.com
01
2023
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03
Bend bending process and control requirements
During the manufacturing process, each bend is completed through several bends. Place the steel pipe on the pipe bender, and the pipe bender applies a bending moment to the steel pipe to deform the steel pipe locally to form a certain angle to achieve the bending purpose. The basic process is: the rear end clamp clamps the steel pipe, and then moves upward through the fulcrum of the front end lower mold master cylinder, causing the steel pipe to bend and deform along the middle of the upper mold curve until it is bent into shape.
During the process of bending, the deformation of the steel pipe occurs on the upper mold, which acts as a mold. The curve is determined based on the critical value of plastic deformation of steel pipes of different specifications and materials. Different steel pipes correspond to different upper molds.
Bend can be controlled from two aspects based on the cause of wrinkles: on the one hand, during the bending process, the inner tube cannot be placed on the side close to the front clamp, but should be placed on the side close to the lower mold bending cylinder, and the rear of the inner tube extends about 150 mm beyond the rear of the upper tube. At the same time, during the first three bends, the lift of the bending cylinder should not be too large. In the subsequent process, the lift of the bending cylinder should gradually increase until the steel pipe contacts the upper tire arc height, which can ensure a smooth transition of the steel pipe during the bending process and ensure that the steel pipe does not lose stability and deformation.
During the bending process of a curved pipe, the axial position of its inner tube is difficult to control. Therefore, a position indicator car is designed and manufactured, and a pole is used to rigidly connect the inner tube to the car. When the inner tube coincides with the center line of the upper mold, record the relative position of the trolley. After a bending operation, when the steel tube moves backward and axially, move the inner tube and the trolley backward for a working length, then release the inner tube expansion mechanism, start the inner tube motor, and move the inner tube and the trolley forward until the trolley returns to the original calibration position.
In order to control the perpendicularity of the inner tube, we use a position indicator to fix it on the connecting rod, and at the same time draw a position indicator mark on the pipe orifice. When the position indicator deflects, the inner tube is promptly withdrawn and manually corrected.
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Contact person: Mr. Huang
Contact address: Floor 2, No. 26, Zhongyuan, Pukou Street District, Shengzhou City, Shaoxing City, Zhejiang Province
Tel：86-13857581028
Email：hweif@139.com
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