Calculating method for feeding of thin-walled bent copper pipes

Abstract

The invention relates to a calculating method for feeding of thin-walled bent copper pipes. The method comprises the following steps: bending a plurality of copper pipes of different lengths and different specifications at a certain angle on a pipe bending machine, setting the initial lengths of the copper pipes as L0, setting a pipe bending radius as R, measuring the actual lengths L of the bent copper pipes along the center lines of the bent copper pipes, and calculating the average value LAverage of the actual lengths of the bent copper pipes of all specifications. Therefore, the pipe bending elongation Delta is equal to LAverage-L0; and when the pipe bending angle is Theta, the pipe bending elongation Delta Theta is equal to (180-Theta)Delta / 90, and the lengths LN' of the bending points of the Nth segments of the bent copper pipes are equal to L1+(180-Theta1)PiR / 180-(180-Theta1)Delta / 90+L2 + ...... + (180-ThetaN-1)PiR / 180-(180-ThetaN-1)Delta / 90+LN. The axial lengths of the central lines of the bent copper pipes produced according to the method have little difference; the pipe bending is simple; and the accuracy is high.

Description

technical field [0001] The invention relates to the field of copper pipe processing, in particular to a calculation method for blanking of thin-walled copper pipe bends. Background technique [0002] Thin-walled copper elbows are widely used in refrigeration systems, air conditioning, heat exchange and other equipment. The mass production of copper bends is generally cold-formed on a CNC pipe bender, refer to Figure 1-2 As shown, place the pipe bending die 3 on the copper pipe 1, align the center of the pipe bending die 3 with the bending position of the copper pipe 1, clamp the side of the copper pipe 1 to be bent with the clamping block 4, and place the copper pipe The side of the pipe 1 that does not need to be bent is placed on the guide plate 5, and a multi-section live core 2 is inserted in the passage, and is bent and formed by a pipe bender. During the forming process, the outer pipe wall produces tensile deformation and the inner pipe wall undergoes short compress...

AI Technical Summary

Problems solved by technology

This makes it difficult to determine the blanking size before bending and the position of each bending point, and cannot guarantee the forming size after bending

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