CN114193097B - Processing method for improving ultrasonic flaw detection qualification rate of titanium alloy ultra-long seamless pipe - Google Patents
Processing method for improving ultrasonic flaw detection qualification rate of titanium alloy ultra-long seamless pipe Download PDFInfo
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Abstract
The invention discloses a processing method for improving ultrasonic flaw detection qualification rate of a titanium alloy ultra-long seamless pipe, which is characterized in that a pipe blank prefabrication process is carried out before cogging and rolling in a titanium alloy pipe preparation process, and the pipe blank prefabrication process comprises pipe blank prefabrication, inner surface boring and outer surface turning. According to the invention, the tube blank prefabrication process is carried out before cogging and rolling in the existing titanium alloy tube preparation process, so that the deviation of the inner diameter and the outer diameter of the tube blank is effectively reduced, the defects of the inner surface and the outer surface of the tube blank are further eliminated or reduced, the tube blank meeting the process requirements is obtained, and the generation and expansion of cracks of the inner surface and the outer surface of the tube in the subsequent processing process are greatly reduced, so that the ultrasonic flaw detection qualification rate of the titanium alloy ultra-long seamless tube is improved, the obtained product is high in precision and good in stability, the processing efficiency is improved while the product quality is met and stabilized, and the popularization and the use are facilitated.
Description
Technical Field
The invention belongs to the technical field of titanium alloy seamless pipe processing, and particularly relates to a processing method for improving ultrasonic flaw detection qualification rate of a titanium alloy ultra-long seamless pipe.
Background
The metal titanium is known as 21 st century metal, belongs to one of rare metals, and is mainly characterized by small density, light weight, high strength and corrosion resistance, and is widely applied to various aspects of heat exchangers and the like of large-scale chemical engineering projects. With the increase of the capacity of chemical engineering projects, the matched titanium heat exchanger has larger and larger volume, and the length of the seamless pipe is longer and longer. The length of each tube used for the heat exchanger is basically concentrated at about 6000mm in 2005, and the length of each tube breaks through 10000mm from 2010 and even longer. With the increase of the length of a single pipe, the production difficulty and quality control of the pipe are increased by geometric factors.
The titanium tubing for the outlet heat exchanger implements the ASTM B338 or ASME SB338 standards, which, in addition to being otherwise very stringent, are particularly subject to higher requirements for ultrasonic non-destructive testing, which places higher and more stringent requirements on the quality of the inner and outer surfaces of the tubing and the machining process. At present, the traditional processing method for the titanium alloy ultra-long seamless pipe comprises the following steps: bar blank, drilling, copper cladding, extrusion, copper removal and acid washing, blanking, scraping, cogging and rolling, degreasing, acid washing, annealing, scraping, intermediate multi-pass rolling, degreasing, acid washing, annealing, scraping, rolling finished products, degreasing, acid washing, annealing, straightening finished products, flat head, ultrasonic flaw detection, cutting to length, final detection and finished product warehousing. Under the process, the ultrasonic flaw detection qualification rate of the titanium pipe can reach about 70%, namely at least 30% of the pipe is unqualified, the waste of raw materials is caused, and the production cost and the material cost are high.
The titanium material belongs to rare metal, the price is very expensive, and for ultra-long pure titanium seamless pipes, how to improve the ultrasonic flaw detection qualification rate is the most critical factor for improving the yield, reducing the production cost and improving the production efficiency.
Disclosure of Invention
The invention aims to solve the technical problem of providing a processing method for improving the ultrasonic flaw detection qualification rate of the titanium alloy ultra-long seamless pipe. According to the method, the tube blank prefabrication process is carried out before cogging and rolling in the existing titanium alloy tube preparation process, so that defects of the inner surface and the outer surface of the tube blank are effectively eliminated or reduced, the tube blank meeting the process requirements is obtained, and the generation and expansion of cracks of the inner surface and the outer surface of the tube in the subsequent processing process are greatly reduced, so that the ultrasonic flaw detection qualification rate of the titanium alloy ultra-long seamless tube is improved.
In order to solve the technical problems, the invention adopts the following technical scheme: a processing method for improving ultrasonic flaw detection qualification rate of a titanium alloy ultra-long seamless pipe is characterized by carrying out a pipe blank preparation process before cogging and rolling in a titanium alloy pipe preparation process, wherein the pipe blank preparation process comprises pipe blank pre-rolling, inner surface boring and outer surface turning.
The preparation process of the titanium alloy ultra-long seamless pipe comprises the following steps: bar blank, drilling, copper cladding, extrusion, copper removal and acid washing, blanking, scraping, cogging and rolling, degreasing, acid washing, annealing, scraping, intermediate multi-pass rolling, degreasing, acid washing, annealing, scraping, rolling finished products, degreasing, acid washing, annealing, straightening finished products, flat head, ultrasonic flaw detection, cutting to length, final detection and finished product warehousing.
In the preparation process of the titanium alloy ultra-long seamless pipe, in order to improve the ultrasonic flaw detection qualification rate, the inner surface boring treatment is generally carried out after the working procedures of oil removal, acid washing, annealing and the like are carried out after the first-pass large-deformation rolling of cogging rolling is finished, and the outer surface is treated by adopting manual scraping. After the first-pass large-deformation rolling, the inner surface and the outer surface of the titanium alloy pipe are subjected to large deformation flow due to metal, so that new cracks are generated or original cracks are expanded, a part of cracks can be removed by adopting a method of manually scraping and repairing the inner surface and the outer surface, but the cracks can not be thoroughly eliminated, in the subsequent rolling process, the cracks can be continuously expanded and extended due to the fact that the cracks are not treated cleanly, and finally the flaw detection qualification rate is low.
The invention is based on the existing titanium alloy seamless pipe preparation process, and performs the pipe blank preparation process before cogging and rolling in the existing titanium alloy pipe preparation process, which comprises pipe blank pre-rolling, inner surface boring and outer surface turning, wherein the inner diameter deviation and the outer diameter deviation of the pipe blank are controlled to be minimum as much as possible by utilizing the pipe blank pre-rolling, which is beneficial to the removal of subsequent defects, then the boring method is continuously adopted to eliminate the defects of the inner surface of the pipe blank, the turning is adopted to replace manual work to eliminate the defects of the outer surface, and the subsequent processing is performed according to the normal process flow, so that the defects of the inner surface and the outer surface of the pipe blank are effectively eliminated or reduced, the pipe blank meeting the process requirements is obtained, and the generation and expansion of the cracks of the inner surface and the outer surface of the pipe in the subsequent processing process are greatly reduced, thereby the ultrasonic flaw detection qualification rate of the titanium alloy ultra-long seamless pipe is improved.
The processing method for improving the ultrasonic flaw detection qualification rate of the titanium alloy ultra-long seamless pipe is characterized in that the cogging rolling is performed by adopting a two-roller pipe rolling mill, and the deformation is 60% -70%. The invention adopts the two-roller tube rolling mill to realize larger deformation, simultaneously obtains good metallographic structure and comprehensive mechanical property, and is beneficial to improving the qualification rate of the titanium alloy ultra-long seamless tube.
The processing method for improving the ultrasonic flaw detection qualification rate of the titanium alloy ultra-long seamless pipe is characterized in that the pre-rolling of the pipe blank is performed by adopting a three-roller pipe rolling mill, and the deformation is 10% -25%; the inner surface boring adopts boring equipment to cut and remove the wall thickness of the inner surface of the pre-rolled tube blank, and the wall thickness removal amount is within 0.5 mm; and the outer surface turning adopts a centerless lathe to carry out turning removal on the wall thickness of the outer surface of the tube blank after the inner surface boring, and the wall thickness removal amount is within 0.5 mm.
In the traditional titanium alloy ultra-long seamless pipe processing method, after the pipe blank is subjected to cogging with large deformation, the original cracks on the inner surface of the pipe blank can be expanded or coated, but part of defects can be eliminated after the inner hole is bored, but the defects can not be thoroughly eliminated, and in the subsequent rolling process, the cracks which are not eliminated are continuously expanded, so that the ultrasonic flaw detection qualification rate of a finished product is reduced.
Meanwhile, the traditional titanium alloy ultra-long seamless pipe processing method does not have a process of turning an outer circle, the outer surface defect is removed only by adopting a manual scraping method after each pass of rolling, and the scraping quality depends on the proficiency of operators and a certain subjective factor, so that the scraping quality and the stability of the quality cannot be effectively ensured, and the production efficiency is lower. The invention adopts the centerless lathe to turn the outer surface, namely the outer circle, so that the defect of the outer surface of the tube blank can be greatly eliminated while the turning amount is ensured, and the tube blank can be produced in the next working procedure without scraping after the subsequent working procedures are finished, thereby reducing the labor intensity of operators, improving the production efficiency and shortening the production period.
The processing method for improving the ultrasonic flaw detection qualification rate of the titanium alloy ultra-long seamless pipe is characterized in that when the process design is carried out on the target product titanium alloy ultra-long seamless pipe, the weight loss of the titanium alloy generated by the pre-rolling, inner surface boring and outer surface turning processes is counted into the weight of a rod blank, and when the specification design of an extruded pipe blank is carried out, the wall thickness removal amount of the inner surface boring and outer surface turning is counted into the outer diameter, the inner diameter and the wall thickness of the extruded pipe blank. According to the rolling processing 'volume invariance law', the weight loss of the titanium alloy generated by the tube blank preparation process is counted into the weight of the rod blank in the process design, and the wall thickness removal amount for boring the inner surface and turning the outer surface is counted into the specification design of the extruded tube blank, so that the adverse effect of the processing amount of the tube blank preparation process on the whole process is avoided, and the dimensional specification of the titanium alloy ultra-long seamless tube which is the target product is ensured to meet the design requirement.
The processing method for improving the ultrasonic flaw detection qualification rate of the titanium alloy ultra-long seamless pipe is characterized in that the pre-rolling of the pipe blank is one-pass rolling. The invention optimizes the outer diameter and the inner hole size of the tube blank by the pre-rolling of the tube blank of one pass and adopting smaller rolling deformation, provides convenient conditions for subsequent boring and turning, and greatly improves the straightness of the titanium alloy ultra-long seamless tube by combining with the subsequent straightening process.
Compared with the prior art, the invention has the following advantages:
1. according to the invention, the tube blank prefabrication process is carried out before cogging and rolling in the existing titanium alloy tube preparation process, and comprises tube blank prefabrication, inner surface boring and outer surface turning, so that the defects of the inner surface and the outer surface of the tube blank are effectively eliminated or reduced, the tube blank meeting the process requirements is obtained, and the generation and expansion of cracks of the inner surface and the outer surface of the tube in the subsequent processing process are greatly reduced, so that the ultrasonic flaw detection qualification rate of the titanium alloy ultra-long seamless tube is improved.
2. The method has the advantages of simplicity, low processing difficulty and low cost, and the obtained product has high precision, good stability and high ultrasonic flaw detection qualification rate, meets and stabilizes the quality of the product, improves the processing efficiency, and is convenient to popularize and use.
3. The equipment adopted by the invention is conventional equipment used in the pipe production process, is easy to obtain and realize processing, and further improves the practicability of the invention.
4. The processing method reduces the occurrence of cracks on the outer surface of the pipe in the subsequent processing, avoids the process of manually scraping and repairing the outer surface of the semi-finished product in the pipe production process, reduces the labor intensity of operators, improves the processing precision and the processing efficiency, and shortens the pipe production period.
5. The method is suitable for the titanium alloy ultra-long seamless pipe and is also suitable for the processing process of zirconium or other alloy ultra-long seamless pipes.
The technical scheme of the invention is further described in detail by examples.
Detailed Description
Taking a titanium alloy ultra-long seamless pipe with the design specification of phi 19mm multiplied by 1.24mm multiplied by 11000mm (outer diameter multiplied by wall thickness multiplied by length), the brand of Gr.7 and the implementation standard of ASTM B338 as an example, the pipe preparation is respectively carried out according to the traditional processing method of comparative example 1 and the processing method of the invention of example 1, and the specific related process flows are shown in the following table 1:
TABLE 1
As can be seen from Table 1, the flaw detection qualification rate of the titanium alloy ultra-long seamless pipe processed in the embodiment 1 of the invention is 78.81%, which is improved by nearly 10% compared with 69.56% of the traditional process in the comparative example 1, so that the processing method of the invention effectively improves the ultrasonic flaw detection qualification rate of the titanium alloy ultra-long seamless pipe, greatly reduces the total feeding amount, reduces the labor intensity of operators, shortens the production period, further improves the production efficiency, and reduces the material cost and the production cost.
Example 1 a tube blank preparation process comprises tube blank pre-rolling, inner surface boring and outer surface turning, wherein cogging rolling is performed by adopting a two-roller tube rolling mill, the deformation amount is 62.50%, tube blank pre-rolling is performed by adopting a three-roller tube rolling mill, the rolling pass is one pass, the deformation amount is 15.56%, and outer surface turning is performed by adopting a centerless lathe.
Meanwhile, for the titanium alloy ultra-long seamless pipe with the same specification, in the embodiment 1, the weight loss of the titanium alloy generated by the pre-rolling, inner surface boring and outer surface turning processes is counted into the weight of a rod blank in the process design, and the wall thickness removal amount for the inner surface boring and outer surface turning is counted into the outer diameter, the inner diameter and the wall thickness of the extruded pipe blank in the process design of the extruded pipe blank, so that the outer diameter and the wall thickness of the pipe blank adopted in the embodiment 1 are both larger than those of the comparative example 1, the extrusion adopted in the extrusion process of the pipe blank is smaller, the extrusion force is smaller, the generation of processing defects can be restrained, better tissue performance can be obtained, the drilling specification of the embodiment 1 is smaller than that of the comparative example 1, and the titanium alloy raw material is saved.
A plurality of batch tests prove that the processing method is stable and reliable, is not only suitable for processing the titanium alloy ultra-long seamless pipe, but also can be popularized and applied to the production of titanium alloy high-standard seamless pipes, zirconium seamless pipes and nickel seamless pipes, and has very high popularization value.
The above description is only of the preferred embodiments of the present invention, and is not intended to limit the present invention. Any simple modification, variation and equivalent variation of the above embodiments according to the technical substance of the invention still fall within the scope of the technical solution of the invention.
Claims (3)
1. A processing method for improving ultrasonic flaw detection qualification rate of a titanium alloy ultra-long seamless pipe is characterized by comprising the steps of performing a pipe blank preparation process before cogging and rolling in a titanium alloy pipe preparation process, wherein the pipe blank preparation process comprises pipe blank pre-rolling, inner surface boring and outer surface turning; the tube blank pre-rolling is carried out by adopting a three-roller tube rolling mill, and the deformation is 10% -25%; the inner surface boring adopts boring equipment to cut and remove the wall thickness of the inner surface of the pre-rolled tube blank, and the wall thickness removal amount is within 0.5 mm; the outer surface turning adopts a centerless lathe to carry out turning removal on the wall thickness of the outer surface of the tube blank after the inner surface boring, and the wall thickness removal amount is within 0.5 mm; the cogging rolling is carried out by adopting a two-roller pipe rolling mill, and the deformation is 60% -70%.
2. The processing method for improving the ultrasonic flaw detection qualification rate of the titanium alloy ultra-long seamless pipe according to claim 1, wherein when the process design is carried out on the titanium alloy ultra-long seamless pipe as a target product, the weight loss of the titanium alloy generated by the pre-rolling, inner surface boring and outer surface turning processes is counted into the weight of a rod blank, and when the specification design is carried out on an extruded pipe blank, the wall thickness removal amount of the inner surface boring and outer surface turning is counted into the outer diameter, the inner diameter and the wall thickness of the extruded pipe blank.
3. The processing method for improving the ultrasonic flaw detection qualification rate of the titanium alloy ultra-long seamless pipe according to claim 1, wherein the pre-rolling of the pipe blank is one-pass rolling.
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| US4043023A (en) * | 1975-05-13 | 1977-08-23 | Lombard Daniel L | Method for making seamless pipe |
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