CN118123435B - Method for eliminating surface defects of thin-wall titanium welded pipe - Google Patents
Method for eliminating surface defects of thin-wall titanium welded pipe Download PDFInfo
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- CN118123435B CN118123435B CN202410551196.7A CN202410551196A CN118123435B CN 118123435 B CN118123435 B CN 118123435B CN 202410551196 A CN202410551196 A CN 202410551196A CN 118123435 B CN118123435 B CN 118123435B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
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Abstract
The invention provides a method for eliminating surface defects of a thin-wall titanium welded pipe, which comprises the following steps: step 1: when preparing cold-rolled GR2 titanium coiled strips for welded pipes, the surface hardness of the titanium strip is improved to be more than or equal to 170HV1; step 2: a roughening roller leveling process is implemented, and the roughness of the surface of the titanium tape is improved to be more than or equal to 0.4 mu m; step 3: bending and forming a titanium belt to prepare a round titanium welded pipe, wherein a forming roller is made of engineering plastic or bakelite; step 4: welding the pipe after the titanium belt is formed, and a welding closed roller is needed before welding the pipe; step 5: sizing and straightening the thin-wall titanium welded pipe by adopting a sizing roller after welding; step 6: and (3) performing ultrasonic flaw detection, eddy current flaw detection, sawing, underwater air tightness detection and inspection on the titanium belt after molding, pipe welding and sizing, and finally obtaining a qualified titanium welded pipe finished product. By comprehensive measures such as surface hardening of the titanium belt and die optimization, obvious nail lines do not exist on the appearance of the finished product, the nail line defect on the surface of the titanium welded pipe is solved, the problem of long debugging time is effectively reduced, and the production efficiency is improved.
Description
Technical Field
The invention relates to the field of titanium material processing, in particular to a method for eliminating surface defects of a thin-wall titanium welded pipe.
Background
The titanium material has the outstanding advantages of excellent corrosion resistance, high specific strength, no magnetism and the like, the titanium welded pipe is formed by welding a cold-rolled titanium belt, and the titanium welded pipe has the advantages of corrosion resistance, scouring resistance, short production procedure, low cost, high efficiency and the like, and is mainly applied to heat exchange equipment such as a tube type heat exchanger, a condenser, an evaporator, a conveying pipeline and the like, and is widely applied to the industries of sea water desalination, power stations, petrochemical industry, nuclear power, PTA and the like. The thin-wall titanium welded pipe has the advantages of higher heat transfer coefficient, better heat exchange effect, no pollution to water quality due to difficult scaling in the use process, environmental protection, and longer service life of more than 30 years, so that the demand is larger and larger.
The common thin-wall titanium welded pipe is GR2 with the wall thickness of 0.3-1.0 mm, and is formed by roll cold bending, and the yield strength and resilience of titanium are high, and meanwhile, the wear resistance is poor, so when the titanium welded pipe is prepared by using a titanium belt with lower surface roughness or lower oxygen content (O content is less than or equal to 0.085%), particularly when the titanium belt with the surface hardness of lower than 170HV is used for preparing the titanium welded pipe with the medium pipe diameter (phi 20-phi 35 mm), grinding marks similar to nail marks are easy to appear on the surface of the titanium pipe, and meanwhile, the mold roller is greatly worn, the mold repair frequency is increased, the service life of the mold is reduced, and the production efficiency is reduced. The titanium welded pipe has high surface quality requirement, and the nail lines do not meet the quality requirement, so that other problems are easy to generate in use, thereby reducing the yield and the yield.
Disclosure of Invention
In view of the above, the invention aims to provide a method for eliminating the surface defects of a thin-wall titanium welded pipe, so as to solve the problems that the surface of the titanium pipe is easy to generate grinding marks similar to nail marks, damage a die and reduce the production efficiency when the titanium welded pipe with medium pipe diameter is prepared in the prior art.
In order to achieve the above purpose, the technical scheme of the invention is realized as follows:
A method for eliminating surface defects of a thin-walled titanium welded tube, comprising:
Step 1: when preparing cold-rolled GR2 titanium coiled strips for welded pipes, the surface hardness of the titanium strip is improved to be more than or equal to 170HV1;
step 2: a roughening roller leveling process is implemented, and the roughness of the surface of the titanium tape is improved to be more than or equal to 0.4 mu m;
step 3: bending and forming a titanium belt to prepare a round titanium welded pipe, wherein a forming roller is made of engineering plastic or bakelite;
Step 4: welding the pipe after the titanium belt is formed, and a welding closed roller is needed before welding the pipe;
step 5: sizing and straightening the thin-wall titanium welded pipe by adopting a sizing roller after welding;
Step 6: and (3) performing ultrasonic flaw detection, eddy current flaw detection, sawing, underwater air tightness detection and inspection on the titanium belt after molding, pipe welding and sizing, and finally obtaining a qualified titanium welded pipe finished product.
In the step 1, bao Tai strips are rolled by adopting a pass deformation amount not less than 12%, and the rolling is performed by using a twenty-roller cold rolling mill.
Further, in the step 2, the surface roughness of the lifting roller is improved through shot blasting roughening or laser roughening measures, and then the titanium coil is roughened.
Further, the surface roughness of the lifting roller is improved to be 2-12 mu m through shot blasting roughening or laser roughening measures.
In step 4, the welding closed roller mold is made of pure copper.
In step 5, the sizing roller is designed into a copper-steel-copper composite structure, the middle part of the hole pattern is made of die steel, and copper alloys are arranged on two sides of the hole pattern.
Further, the die steel is Cr12MoV steel.
Further, the copper alloy is tin bronze TS4.
Further, the wall thickness of the thin-wall titanium welded pipe is not more than 0.6mm.
Further, in the step 1, a GR2 titanium plate blank with the O content of 0.07-0.085% is used for preparing coiled materials through hot rolling, and qualified hot rolled titanium coiled materials are obtained through on-line annealing and shot blasting pickling.
Compared with the prior art, the process method for eliminating the surface defects of the thin-wall titanium welded pipe has the following advantages:
by comprehensive measures such as surface hardening of the titanium belt and optimization of the mold, the nail streak defect on the surface of the titanium welded pipe is solved, the problem of long debugging time is effectively reduced, the production efficiency is improved, the roll marks on the surface of the titanium welded pipe are eliminated, the roll marks are generated by friction between the mold and the titanium belt, and the surface quality of the welded pipe is obviously improved by technological measures.
Drawings
FIG. 1 is a diagram of a titanium belt surface scanning electron microscope in the prior art, which is prone to nail print;
FIG. 2 is a view of a scanning electron microscope of a titanium belt surface with little possibility of nail print;
FIG. 3 is a schematic view of a sizing roller according to an embodiment of the present invention;
FIG. 4 is a side view of a sizing roller according to an embodiment of the present invention.
Detailed Description
In order that the above objects, features and advantages of the invention will be readily understood, a more particular description of the invention will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings.
The titanium tape surface, which is prone to nail streaks, is relatively smooth overall, has only a few flaking off, and has poor wear resistance (as shown in fig. 1). The continuous nail-shaped defect formed on the surface of the titanium welded pipe is analyzed, microscopic appearance shows that the surface of the titanium pipe has furrows and peeling defects, the damage of the surface abrasion of pure titanium is far stronger than that of point abrasion, and the smoother surface is more easy to be stuck with friction objects to cause particle falling; in the forming stage, the titanium belt is in contact with the copper mold too tightly, particles on the surface of the titanium belt are adhered by the copper mold, and the small particles are adhered to the copper mold to scratch the surface of the titanium belt.
When the pipe diameter of the prepared titanium welded pipe is large, the forming curvature radius is large, the forming is easy, and the friction load is small; if the pipe diameter is too small, the linear speed difference of the hole shape of the die is small, and the friction speed is small, so that fingernail marks are easy to generate in the medium-diameter titanium welded pipe. Nail lines are mainly concentrated on a closed roller of a welding roller when the same specification forming section die appears, and are mainly concentrated on the lower part of the welding roller when the nail lines appear on the welding roller, and the occurrence of the upper part is less. When the titanium belt has uneven surface, obvious height fluctuation and higher hardness, nail lines are not easy to generate. Therefore, in order to eliminate nail prints, the invention adopts the following scheme:
step 1: when the cold-rolled GR2 titanium coiled strip for the welded pipe is prepared, the surface hardness of the titanium strip is improved to be more than or equal to 170HV1.
The formability of the titanium strip and the hardness of the surface are mainly related to the chemical composition of the rolled blank, the rolling process, the annealing and the flattening process. In actual production, the high-pass deformation is preferentially adopted for production (the pass deformation is more than or equal to 12%), the surface hardness and quality of the titanium tape can be improved, and when the high-pass deformation is adopted for rolling the thin titanium tape, the requirement on equipment is higher, and generally, a twenty-roller cold rolling mill with higher rolling capacity is adopted for production.
Step 2: and (3) implementing roughening roller leveling process, and improving the roughness of the surface of the titanium tape to be more than or equal to 0.4 mu m.
When the cold rolled titanium coiled tape with the thickness not exceeding 0.6mm is rolled, the requirement on equipment is high, if the equipment can only perform small-pass deformation rolling (the pass deformation is less than or equal to 12 percent), the surface hardness and the performance of the titanium coiled tape need to be increased, and a texturing roller flattening process is developed, namely, flattening rolling treatment is performed on the finished titanium coiled tape by utilizing a texturing roller; for the titanium coiled tape prepared by large-pass deformation, a texturing flattening process is also generally adopted for surface optimization. After the titanium coil is rolled by adopting a smooth roll (the surface roughness is less than or equal to 0.4 mu m), the surface roughness of a finished coiled material with the thickness of 0.5mm is smaller (generally 0.2-0.4 mu m); the surface roughness (2-12 mu m) of the lifting roller is improved by the measures of shot blasting roughening, laser roughening and the like, and then the titanium coil is roughened, so that the roughness of the titanium coil can be obviously improved (more than or equal to 0.4 mu m).
Step 3: the forming roller of the thin-wall titanium welded pipe is made of engineering plastics or bakelite, so that the surface defects of nail lines and the like on the surface of the titanium welded pipe are improved.
The titanium belt is required to be bent and molded, then a round titanium welded pipe is prepared, copper alloy is generally used at the early stage of a bending molding roller, and defects such as nail lines and the like are easy to generate; the material of the forming roller is changed into engineering plastic or bakelite, so that the forming roller has better effect, is preferably prepared from the bakelite, has low price, has the service life which is not inferior to that of copper alloy, and is not easy to form nail prints on the surface of the titanium tube after forming.
Step 4: after the titanium belt is formed and before welding, a welding roller is needed, and the welding roller is preferably made of pure copper.
The titanium strip is welded after being molded, the phenomenon of uneven shape possibly exists, a welding closed roller is needed before the welding of the pipe, a pure copper material is selected as a welding closed roller die, the hole shape is properly enlarged to reduce friction, the nail line phenomenon can be effectively eliminated, and meanwhile, no grinding marks, roller marks and the like with hand feeling exist on the surface of the pipe.
Step 5: when sizing and straightening are carried out after welding the thin-wall titanium welded pipe, the sizing roller is designed into a copper-steel-copper composite structure, the middle part of the hole pattern is die steel (Cr 12MoV steel), and copper alloys (tin bronze TS 4) are arranged on two sides.
As shown in fig. 3 and 4, the sizing roller is arranged in a structure with a thin middle and thick two ends. The sizing roller includes an end 11 and an intermediate section 12, the intermediate section 12 having an outer diameter smaller than the end 11 at both ends, and is provided from the intermediate section 12 to both ends 11 in a smoothly gradual change structure in which the outer diameter gradually increases. Wherein the middle section 12 is made of die steel, and the two end parts are made of copper alloy.
The thin-wall titanium belt is required to be subjected to sizing and straightening treatment after being formed and welded so as to obtain good appearance, a copper sizing roller is generally used in the early stage, a copper-steel-copper composite structure is manufactured after the sizing roller is innovatively designed, the middle part of a hole pattern is changed into steel, so that the wear resistance of the most intense friction area can be ensured, the friction of a die on the surface of a titanium pipe is avoided, and emulsified lubricating oil is used for sizing and straightening the titanium belt with low hardness and easy generation of nail lines.
Step 6: and (3) performing ultrasonic flaw detection, eddy current flaw detection, sawing, underwater air tightness detection and inspection after forming, pipe welding and sizing on the titanium belt, and finally obtaining a qualified titanium welded pipe finished product.
By adopting the process method for eliminating the surface defects of the thin-wall titanium welded pipe, through comprehensive measures such as surface hardening of the titanium belt, optimization of the mold and the like, the appearance of the finished product is free from obvious nail marks, the problem of long debugging time is effectively solved, the production efficiency is improved, the roll marks on the surface of the titanium welded pipe are eliminated, the roll marks are also generated by friction between the mold and the titanium belt, and the surface quality of the welded pipe is obviously improved through the process measures.
Example 1, Φ32x0.5mmgr2 titanium welded tube was prepared.
Preparing a coiled material with the thickness of 4mm by hot rolling by using a GR2 titanium plate blank with the O content of 0.075-0.085%, and carrying out on-line annealing and shot blasting pickling to obtain a qualified hot rolled titanium coiled material; and then cold rolling in two rolling processes, rolling by a four-roller mill, wherein the pass deformation is 5-12%, the coil with the thickness of 0.5mm is prepared, roughening and flattening are carried out on the finished titanium belt by using laser Mao Huagun with the roughness of 6-9 mu m, the surface roughness of the titanium belt reaches 0.67 mu m, the surface hardness is 177-186HV1, the transverse tensile strength is 391-413MPa, the yield strength is 297-315MPa, and the elongation is 30-37%. Specifically, as shown in FIG. 2, a scanning electron microscope image of the surface of the titanium belt with a surface hardness of 177-186HV1 was obtained in this example.
During the shaping of titanium area, the material of shaping roller uses the bakelite, and the welding is closed the roller and is used pure copper material and enlarge hole shape slightly and prevent friction, adopts copper steel copper composite construction to the sizing roller, is steel (Cr 12MoV mould steel) in the middle, and both sides are copper alloy (tin bronze TS 4), has effectively eliminated nail line phenomenon, has reduced the loss of mould simultaneously, has improved production efficiency. The appearance and the performance of the prepared phi 32 multiplied by 0.5 mGR2 titanium welded pipe meet the related requirements, the stable batch supply is realized, and the effect is good.
As shown in table 1, in this example, compared with the sizing roller made of copper, the number of trimming and the trimming loss were both low, and the average loss was small. The sizing dies of the copper-1 and the copper-2 are sizing rollers made of tin bronze materials (TS 4) in different batches, and the sizing rollers are high in number of turning and loss and average loss in half a year of use.
Table 1 comparison of sizing dies of different materials for half a year
In the actual production, GR2 thin-wall titanium welded pipes with phi 32 multiplied by 0.5mm are prepared, and in the table 1, the loss of sizing dies made of different materials is compared within half a year, the loss of a steel-copper composite die is minimum, the repairing time is minimum, the service life of the die can be prolonged by using steel materials in the middle, and the most serious part of die wear can be transferred from the middle to two shoulder parts; if the forming roller is seriously worn, the copper steel copper mold effect is improved more obviously. After the optimized die is adopted, the service life of the die at the forming section is prolonged from 28 to 40 tens of thousands of meters, and the service life of the die at the sizing section is prolonged from 3.6 to 11.5 tens of thousands of meters. According to the production of 500t per year, one set of forming section mould and 3 sets of sizing section moulds are scrapped before one year, after the service life is prolonged, only 1 set of sizing section mould is scrapped, and the mould cost is reduced by 15 ten thousand yuan; the sizing section mould is replaced for 80 times per year originally, only 35 times are needed now, 45 times are needed to be replaced, the forming section mould is also needed to be replaced for three times, one day of time is needed for each replacement forming, and four hours are needed for sizing, so that 10 days of time can be saved per year, and the annual productivity can be improved by 3%.
Example 2 preparation of Φ25x0.4mmgr2 titanium welded tube.
Preparing a coiled material with the thickness of 3.5mm by hot rolling a GR2 titanium plate blank with the O content of 0.07-0.083%, and carrying out on-line annealing and shot blasting pickling to obtain a qualified hot rolled titanium coiled strip; and then cold rolling in two rolling processes, rolling by adopting a twenty-high rolling mill, wherein the pass deformation is 12-20%, the coil with the thickness of 0.4mm is prepared, roughening and flattening are carried out on the finished titanium belt by using polishing Mao Huagun with the roughness of 3-5 mu m, the surface roughness of the titanium belt reaches 0.52 mu m, the surface hardness is 171-179HV1, the transverse tensile strength is 386-409MPa, the yield strength is 293-312MPa, and the elongation is 31-36%.
During the shaping of titanium area, the engineering plastics is used to the material of shaping roller, and the welding is closed the roller and is used pure copper material and enlarge hole shape slightly and alleviate friction, adopts copper steel copper composite construction to the sizing roller, and the centre is steel (Cr 12MoV mould steel), and both sides are copper alloy (tin bronze TS 4), has effectively eliminated nail line phenomenon, has reduced the loss of mould simultaneously, has improved production efficiency. The appearance and the performance of the prepared phi 25 multiplied by 0.4mmGR2 titanium welded pipe meet the related requirements, the stable supply of the materials in batches is realized, and the effect is good.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be made by one skilled in the art without departing from the spirit and scope of the invention, and the scope of the invention should be assessed accordingly to that of the appended claims.
Claims (4)
1. A method for eliminating surface defects of a thin-walled titanium welded tube, comprising:
Step 1: when preparing cold rolled GR2 titanium coiled strip for welded pipes with O content of 0.07-0.083%, rolling Bao Tai strip with pass deformation of 12-20%, roughening and flattening the finished titanium strip by using polishing Mao Huagun with roughness of 3-5 μm, wherein the surface roughness of the titanium coiled strip reaches 0.52 μm, the surface hardness of 171-179HV1, the transverse tensile strength of 386-409MPa, the yield strength of 293-312MPa and the elongation of 31-36%; for preparing a titanium tape by a cold rolling process with the pass deformation of 5% -12%, roughening and flattening a finished titanium tape by using a laser Mao Huagun with the roughness of 6-9 mu m, wherein the surface roughness of the titanium tape reaches 0.67 mu m, the surface hardness of 177-186HV1, the transverse tensile strength of 391-413MPa, the yield strength of 297-315MPa and the elongation of 30-37%;
step 2: bending and forming a titanium belt to prepare a round titanium welded pipe, wherein a forming roller is made of bakelite;
Step 3: welding the pipe after the titanium belt is formed, wherein a welding closing roller is needed before the pipe is welded, and the hole shape is enlarged to prevent friction;
step 4: sizing and straightening the thin-wall titanium welded pipe by adopting a sizing roller after welding; the sizing roller is of a copper-steel-copper composite structure with thin middle and thick two ends, the sizing roller comprises end parts and a middle section, the outer diameter of the middle section is smaller than that of the end parts of the two ends, and a smooth gradual change structure with gradually increased outer diameter is arranged from the middle section to the two end parts, wherein the middle section is made of Cr12MoV steel, the end parts of the two ends are made of tin bronze TS4, and lubricating oil is used for sizing and straightening a titanium belt with low hardness and easy to generate nail lines;
Step 5: and (3) performing ultrasonic flaw detection, eddy current flaw detection, sawing, underwater air tightness detection and inspection on the titanium belt after molding, pipe welding and sizing, and finally obtaining a qualified titanium welded pipe finished product.
2. The method according to claim 1, wherein in step 1, the thin titanium strip is rolled with a pass deformation of 12% -20%, using a twenty-high cold rolling mill.
3. The method of claim 1, wherein in step 3, the welding closed rolls are made of pure copper.
4. The method of claim 1, wherein the thin-walled titanium welded tube has a wall thickness of no more than 0.6mm.
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| JPH0635064B2 (en) * | 1986-12-12 | 1994-05-11 | 株式会社神戸製鋼所 | Method for manufacturing tube made of titanium or titanium alloy |
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| CN111975292A (en) * | 2020-07-25 | 2020-11-24 | 张家港市佳旭金属材料有限公司 | Method for manufacturing titanium welded pipe |
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| CN102784811A (en) * | 2011-05-20 | 2012-11-21 | 江苏三得利不锈钢集团有限公司 | Combined roller |
| CN205673395U (en) * | 2016-06-01 | 2016-11-09 | 洛阳双瑞精铸钛业有限公司 | A kind of titanium welding pipe shaped device with high-yield strength TA2 titanium band as raw material |
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| CN115812109A (en) * | 2020-12-24 | 2023-03-17 | 日本制铁株式会社 | Titanium |
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