The titanium tube is made of industrial pure titanium, the grade is GR2, the allowable deviation of the outer diameter of the pipe is ±0.65mm, and the allowable deviation of the wall thickness does not exceed ±12.5% of its nominal wall thickness. The inner and outer surfaces of the pipe should be clean, free of cracks, folds, and Visually visible defects such as skin and pinholes. The product quality of cold-bending titanium tubes with CNC pipe bending machines is high, and the processing efficiency is high. It can complete multiple bendings in one processing, which reduces the workload of subsequent assembly and welding and is suitable for mass production. The key to production is to select appropriate process parameters (including the setting of bending speed, sequence and rebound amount, etc.) according to the mechanical properties of the material and the processing capacity of the equipment, so as to ensure the production of qualified products.
Due to its light-specific gravity, strong strength, and excellent corrosion resistance to alkali, chloride, chlorine organic matter, nitric acid and sulfuric acid, and other media, titanium rod metal is widely used in chemical equipment. Titanium electrodes are used to electrolytically deposit and refine metals, such as copper, gold, nickel, manganese, and manganese dioxide, from sulfuric acid solutions containing sulfides. Titanium metal has excellent corrosion resistance and its oxide film can act as a good separating agent, which is the main reason for its application in the electrolysis industry. In the process of electrolytic production of manganese dioxide, due to the strong corrosion of the electrolyte, the corrosion resistance of titanium can be used to make heaters. The author introduces the structure of the titanium heater, the disadvantages of processing titanium elbows by hot simmering, and the working principle and processing flow of titanium elbows processed by CNC pipe bending machines.
Due to the poor cold workability of titanium materials, there is no research on processing titanium tubes with CNC tube bending machines in domestic and foreign literature. In the recent production of a batch of titanium heaters, in order to improve product quality, is also an attempt to process titanium bends with CNC pipe bending machines. In cooperation with professional bend pipe manufacturers, CNC pipe benders are used to cold-process titanium bends. . The titanium heater is mainly made of a small 60mmX3mm titanium seamless tube, the design pressure is 0.4MPa, and the design temperature is 200°C. The heater is placed in the electrolytic cell filled with electrolytes, and high-temperature steam is passed into the titanium tube to heat the electrolyte during operation. The process of processing titanium elbows by hot simmering is: fill the titanium tubes with fine sand and compact them, then install the titanium tubes on a simple bending mold, heat the parts to be bent with an oxygen lance, and bend the titanium tubes; The bent titanium tubes are cut into 90 pieces each, and then butt-welded with straight tubes. The main disadvantages of the titanium bend processed by the hot simmering method are: large tube ellipse (not less than 4mm), thin thickness (the largest thinning part appears in the outer arc, and the thinning amount exceeds 1mm); the inner wall is easy to wrinkle under pressure; The consistency of size and shape is poor, which leads to manual correction when the sequence is assembled; the processing efficiency is low, and the bending of titanium tubes depends entirely on the experience and technical proficiency of the operator; at the same time, because the titanium tubes are heated during processing, if Poor temperature control can easily cause material oxidation, thereby reducing the corrosion resistance of the equipment.
