Titanium rod metal has light specific gravity, strong strength and has excellent corrosion resistance to alkali, chloride, chlorine organics, nitric acid and sulfuric acid, and 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 producing manganese dioxide by electrolytic method, due to the strong corrosiveness of the electrolyte, the corrosion resistance of titanium can be used to make the heater. The author introduces the structure of the titanium heater, the shortcomings of the hot simmering method of processing titanium bends, and the working principle and processing flow of using CNC pipe bending machines to process titanium bends.
Titanium heater is mainly made of small titanium seamless tube 60mmX3mm, the design pressure is 0.4MPa, the design temperature is 200 ° C. The heater is placed in an electrolytic tank filled with electrolyte, and high-temperature steam is passed into the titanium tube to heat the electrolyte during operation.
The process of processing the titanium elbow pipe by the hot simmer method is: filling the titanium pipe with fine sand and tamping it, and then installing the titanium pipe on a simple bending die, heating the part to be bent with an oxygen gun, and bending the titanium pipe; The bent titanium tube is cut at 90 pieces each, and then welded to the straight tube group. The shortcomings of the titanium bend processed by the hot simmering method are as follows: the tube has a large ovality (not less than 4mm), and the thickness is reduced (the largest thinning part appears in the outer arc, the thinning amount exceeds 1mm); the inner wall is easily wrinkled under pressure; The poor consistency of the size and shape leads to manual correction of the timing of the subsequent group; the processing efficiency is low, and the titanium tube is completely dependent on the experience and technical proficiency of the operator when bending the titanium tube; at the same time, because the titanium tube is heated during the process, if Poor temperature control can easily cause material oxidation, which can reduce the corrosion resistance of the equipment.
Because of the poor cold workability of titanium materials, there is no research on the processing of titanium tubes with CNC pipe bending machines in domestic and foreign literatures. In the recent batch of titanium heater production, in order to improve product quality, it is also an attempt to process titanium bend pipes by CNC pipe bending machines.Cooperate with professional pipe bend processing manufacturers to use CNC pipe benders to cold process titanium bend pipes. .
This batch of 32 sets of titanium heaters, the specifications are 0mmx3mm, the bending radius R is 160mm, and the bending angle in each set is 90. There are 19 of them with a bending angle of 180. There are two.
The titanium tube is made of industrial pure titanium with the brand name TA2. According to the GB / T3624-2010 standard, 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. Clean, free of visual defects such as cracks, folds, peeling and pinholes.
Cold-rolled titanium tube with CNC tube bending machine has high quality and high processing efficiency. It can complete multiple bending operations in one processing, reducing the workload of subsequent pairing and welding, suitable for mass production. The key to the production is to select appropriate process parameters (including the setting of bending speed, sequence and springback, 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.