CN108160744B - Preparation method of aluminum alloy conduit with high inner surface quality - Google Patents
Preparation method of aluminum alloy conduit with high inner surface quality Download PDFInfo
- Publication number
- CN108160744B CN108160744B CN201711484792.4A CN201711484792A CN108160744B CN 108160744 B CN108160744 B CN 108160744B CN 201711484792 A CN201711484792 A CN 201711484792A CN 108160744 B CN108160744 B CN 108160744B
- Authority
- CN
- China
- Prior art keywords
- aluminum alloy
- hollow ingot
- extrusion process
- extrusion
- straightening
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
- B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Metal Extraction Processes (AREA)
Abstract
The invention provides a preparation method of an aluminum alloy conduit with good inner surface quality, which comprises the following steps: sequentially heating, extruding without lubrication, straightening, etching and washing, rolling, reducing and annealing, drawing and straightening the hollow ingot to obtain an aluminum alloy conduit; the length of the hollow ingot in the extrusion process is less than or equal to 350 mm; the length of the perforation needle in the extrusion process is 200-850 mm. The aluminum alloy catheter is prepared by adopting a non-lubrication extrusion process under the condition of the specific length of the perforation needle, and the aluminum alloy catheter with good inner surface quality is obtained under the condition of ensuring that the perforation needle is not damaged in the extrusion process.
Description
Technical Field
The invention relates to the technical field of aluminum alloy, in particular to a preparation method of an aluminum alloy conduit with high inner surface quality.
Background
LF2 alloy thin wall pipe, the oil circuit pipe of wide application in aviation aircraft. At present, the problems of the LF2 alloy thin-walled tube mainly include the problems of size precision, surface quality (surface scratch, channel pulling, pressing and dent), bending test orange peel (excessive grain size) and flaring air-tight test air leakage and the like.
Therefore, there is an urgent need for improvement of the production process of LF2 duct to improve its quality.
Disclosure of Invention
In view of the above, the present invention provides a method for manufacturing an aluminum alloy conduit with high inner surface quality, and the method provided by the present invention can manufacture an aluminum alloy conduit with high inner surface quality.
The invention provides a preparation method of an aluminum alloy conduit with good inner surface quality, which comprises the following steps:
sequentially heating, extruding without lubrication, straightening, etching and washing, rolling, reducing and annealing, drawing and straightening the hollow ingot to obtain an aluminum alloy conduit;
the length of the hollow ingot in the extrusion process is less than or equal to 350 mm;
the length of the perforation needle in the extrusion process is 200-850 mm.
In the present invention, the method for producing the hollow ingot is preferably:
and (4) turning and boring the solid ingot to obtain the hollow ingot.
In the present invention, the solid ingot preferably has the following composition:
0-0.40 wt% silicon;
0-0.40 wt% iron;
0 to 0.10 wt% of copper;
0.15 to 0.40 wt% manganese;
2.0 to 2.5 wt% of magnesium;
0 to 0.15 wt% of titanium;
the total mass content of iron and silicon is not more than 0.6 percent;
the balance being aluminum.
In the invention, the mass content of the silicon is preferably 0.15-0.35%, and more preferably 0.2-0.3%; the mass content of the iron is preferably 0.15-0.35%, and more preferably 0.2-0.3%; the mass content of the copper is preferably 0.02-0.08%, and more preferably 0.04-0.06%; the mass content of the manganese is preferably 0.2-0.35%, and more preferably 0.25-0.3%; the mass content of the magnesium is preferably 2.1-2.4%, and more preferably 2.2-2.3%; the mass content of the titanium is preferably 0.02 to 0.12%, more preferably 0.04 to 0.1%, and most preferably 0.06 to 0.08%. In the present invention, the total mass content of iron and silicon is preferably 0 to 0.6%, more preferably 0.2 to 0.5%, and most preferably 0.3 to 0.4%.
In the invention, the hollow ingot is formed by boring a solid ingot through a lathe tool. The method for boring the lathe leather is not particularly limited, and the lathe leather boring method known by the person skilled in the art can be used for machining.
In the invention, the roughness of the outer surface of the hollow ingot is preferably less than or equal to Ra12.5, more preferably Ra6.3-12.5, more preferably Ra3.2-6.3, and most preferably Ra1.6-3.2. In the present invention, the deviation of the outer diameter of the hollow ingot is preferably ± 0.5 to ± 1.5mm, more preferably ± 0.8 to ± 1.2mm, and most preferably ± 1 mm. In the present invention, the deviation of the inner diameter of the hollow ingot is preferably ± 0.5 to ± 1mm, more preferably ± 0.6 to ± 0.9mm, and most preferably ± 0.7 to ± 0.8 mm. In the present invention, the length deviation of the hollow ingot is preferably ± 4 to ± 8mm, more preferably ± 5 to ± 7mm, and most preferably ± 6 mm.
In the invention, the cutting slope of the hollow ingot is preferably less than or equal to 2 mm; the wall thickness difference of the hollow ingots is preferably less than or equal to 2 mm; the bending degree of the hollow ingot is preferably 0.4-0.6 mm. In the invention, the cutting slope of the hollow ingot is preferably less than or equal to 1.5mm, more preferably 0-1.2 mm, more preferably 0.2-1 mm, more preferably 0.4-0.8 mm, and most preferably 0.5-0.6 mm. In the invention, the wall thickness difference of the hollow ingots is preferably less than or equal to 0.75mm, more preferably 0-0.7 mm, more preferably 0.1-0.6 mm, more preferably 0.2-0.5 mm, and most preferably 0.3-0.4 mm. In the invention, the bending degree of the hollow ingot is preferably 0.4-0.6 mm, and more preferably 0.5 mm; the curvature refers to a curvature per 500mm length.
In the invention, the hollow ingot is preferably heated in an induction heating furnace, and the hollow ingot is preferably heated at a temperature of 450-520 ℃, more preferably at a temperature of 460-500 ℃, and most preferably at a temperature of 470-490 ℃.
In the invention, the length of the hollow ingot in the extrusion process is less than or equal to 350mm, preferably 50-300 mm, more preferably 100-250 mm, more preferably 150-250 mm, and most preferably 200 mm. In the invention, the length of the perforation needle in the extrusion process is preferably 200-850 mm, more preferably 250-800 mm, more preferably 300-750 mm, more preferably 350-700 mm, more preferably 400-650 mm, more preferably 450-600 mm, more preferably 500-550 mm, and most preferably 240mm, 630mm, 730mm or 830 mm.
In the invention, the outer diameter of the hollow ingot in the extrusion process is preferably 30-32 mm, and more preferably 31 mm; the inner diameter of the hollow ingot is preferably 24-26 mm, and more preferably 25 mm; the wall thickness of the hollow ingot is preferably 2.5-4 mm, and more preferably 3-3.5 mm. In the invention, the diameter of the perforating needle in the extrusion process is preferably 24-26 mm, and more preferably 25 mm.
According to the invention, the perforation needle with the length in the technical scheme can obviously reduce the wall thickness difference of the prepared aluminum alloy catheter, and further improve the dimensional accuracy of the prepared aluminum alloy catheter.
In the invention, the extrusion method is non-lubricated extrusion, and the perforation needle with the length in the technical scheme is used for the non-lubricated extrusion.
In the invention, the extrusion speed in the extrusion process is preferably 1-2.5 m/min, more preferably 1.3-2.2 m/min, more preferably 1.5-2 m/min, and most preferably 1.6-1.8 m/min; the extrusion temperature in the extrusion process is preferably 440-460 ℃, more preferably 445-455 ℃, and most preferably 450 ℃; the extrusion ratio in the extrusion process is preferably 15-45, more preferably 20-40, more preferably 25-35, and most preferably 30.
In the invention, the pulling and straightening function is to eliminate bending in the extrusion process and facilitate core bar threading in the subsequent rolling process, and the stretching rate in the pulling and straightening process is preferably 0.5-2.0%, more preferably 0.8-1.6%, more preferably 1-1.4%, and most preferably 1.2-1.3%.
In the invention, the etching and washing function is to remove slight scratches, aluminum scraps, burrs and the like generated in the extrusion process of the pipe blank, the etching and washing method is preferably acid-base washing, and the specific method of the etching and washing is preferably as follows:
blowing off the aluminum scraps in the pulled and straightened aluminum alloy pipe by using compressed air, and sequentially carrying out clear water washing, acid washing, cold water washing (a neutralization tank), alkali washing, cold water washing (a neutralization tank), acid washing and clear water washing.
In the invention, before rolling, whether the inner surface and the outer surface of the pipe blank after being etched meet the requirements is preferably checked, if the pipe blank has obvious defects such as peeling, scratching and the like, the materials which do not meet the requirements are finally rolled in a concentrated mode, and are bundled separately and noted. The tube blank with serious defects should be timely picked out and cut to be discarded. In the invention, waste materials (such as size over-tolerance, internal and external surface defects and the like) generated in the rolling adjustment and the rolling process are preferably cut off in time, and are not allowed to be mixed into qualified materials in normal production. In the present invention, the lubricating oil is preferably required to be clean and free from dirt such as sand and metal chips during the rolling. The lubricating oil circulation system should have a sound filtration device.
In the invention, the rolling method is preferably a two-roller periodic cold-rolled tube method, and the feeding amount in the rolling process is preferably not more than 3.0mm, more preferably 0-3 mm, more preferably 0.5-2.5 mm, and most preferably 1-2 mm. In the invention, the tolerance of the outer diameter of the pipe obtained after rolling is preferably +/-0.5 mm to +/-1.5 mm, more preferably +/-0.8 mm to +/-1.2 mm, and most preferably +/-1 mm; the wall thickness tolerance of the tube obtained after rolling is preferably +/-0.05 mm-0.1 mm, more preferably +/-0.06 mm-0.08 mm, and most preferably +/-0.07 mm; the average wall thickness tolerance of the tube obtained after rolling is preferably from +0.02 to-0.01 mm, more preferably from +0.01 to-0.005 mm. In the present invention, the surface of the pipe obtained after the rolling is preferably free from defects such as scratches, metal or nonmetal indentation, cracks, burrs, waves, hole pattern gnawing, and the like.
In the invention, the reducing annealing can release the stress of the rolled product, increase the ductility and toughness of the rolled product and facilitate the subsequent drawing. In the invention, the temperature of the reducing annealing is preferably 195-205 ℃, more preferably 198-202 ℃, and most preferably 200 ℃; the time for reducing annealing is preferably 0.5 to 1.5 hours, more preferably 0.8 to 1.2 hours, and most preferably 1 hour.
In the invention, the drawing function is reducing, elliptical waves in the rolling process are eliminated, and the tolerance of the outer diameter of the finished conduit is accurately controlled; the drawing method is preferably empty drawing, and the reduction per pass in the drawing process is preferably not more than 3mm, more preferably 0.5-2.5 mm, more preferably 1-2 mm, and most preferably 1.5 mm. In the invention, the surface of the pipe obtained after drawing preferably has no defects such as scratches, cracks, peeling, pressed objects, ridges, jumping rings, overlong hollow drawing sections and the like. In the invention, the tolerance of the outer diameter of the tube after drawing is preferably controlled to be-0.15-0 mm, more preferably-0.12-0 mm, more preferably-0.1-0 mm, and most preferably-0.05-0 mm.
In the invention, slow drawing is preferred, and straightening is carried out as much as possible (especially, the straightening treatment is not carried out on the finished product of the catheter blank with the outer diameter being more than or equal to 50mm in the follow-up process); the pipe blank with the outer diameter less than or equal to 12mm is preferably bundled in the drawing process, and the diameter of each bundle is preferably not more than 100 mm.
In the invention, when the drawing debugging production is carried out, preferably, if the pipe is stuck or the outer diameter is out of tolerance, the pipe is picked out in time. And (3) frequently performing sampling inspection in the drawing process, picking out unqualified materials in the sampling inspection process, and never allowing the unqualified materials to be mixed into qualified materials in normal production. After the whole batch of materials is produced, the unqualified materials are intensively cut to be waste. In the present invention, the drawing is preferably performed by using a special tool and die. And (3) drawing the guide pipe into a mould (comprising a mould, a core head and the like) and implementing special management.
In the present invention, the straightening functions to eliminate the bending. In the present invention, the straightening method is preferably roll straightening (roll straightening) or stretch straightening, and more preferably roll straightening. In the straightening process, the roller type straightening roller is preferably smooth in surface and free of damage, and dirt such as metal chips and the like is avoided. In the invention, the dirt, metal and damage on the surface of the roller are found to be treated in time, the surface of the pipe straightened by the roller is preferably smooth and clean, and the defects of scratch, bruise, indentation, metal indentation, serious spiral mark and the like are avoided.
In the present invention, after the straightening is completed, it is preferable that the straightening further includes:
and cleaning, detecting and annealing the straightened product to obtain the aluminum alloy conduit.
In the present invention, the cleaning (finish washing) is used for cleaning the lubricant on the inner and outer surfaces of the guide tube during the drawing process, the cleaning method is preferably to perform hot water washing and then kerosene washing, and the cleaning method is preferably:
before cleaning, blowing the aluminum scraps in the pipe by using compressed air; cleaning the pipe in hot water, lifting up and down, and the cleaning time is moderate; after the hot water is cleaned, the pipe is placed in a kerosene tank for cleaning, and the pipe is lifted up and down to clean the oil stains on the inner surface and the outer surface of the pipe, and the cleaning time is not limited.
In the present invention, the inspection (product pre-inspection) is used to inspect the outer diameter, wall thickness and surface quality of the catheter, and rejects are selected and discarded.
In the present invention, the method of annealing the finished product preferably comprises the steps of:
(1) the temperature of the empty furnace is set to 480-500 ℃, heat preservation is carried out after the preset temperature is reached, and then the furnace is dried;
(2) after the oven is finished, quickly charging in a hot furnace to finish charging;
(3) setting the furnace temperature to 430-450 ℃ after charging, and carrying out annealing treatment;
(4) rapidly discharging the furnace after the annealing treatment is finished, and carrying out air cooling;
the time from the completion of charging to the discharging is less than or equal to 65 min.
The finished product annealing method of the technical scheme is preferably adopted, the method can ensure that the performance of the prepared aluminum alloy conduit meets the requirement, simultaneously improve the surface grain size of the aluminum alloy conduit, and avoid the phenomenon of orange peel on the bending surface of the aluminum alloy conduit in the later bending process. The high-temperature short-time rapid heating and cooling annealing process is preferably adopted, the metal temperature of the pipe can be rapidly raised to be higher than the recrystallization temperature by charging in a hot furnace, and the metal can finish the recrystallization process after the heat is preserved for a short time. And the steel is quickly cooled after being discharged from the furnace, so that the growth of crystal grains can be effectively prevented. The heating and cooling speed is increased, and the crystal grains can be effectively refined. The invention adopts a high-temperature and short-time annealing process, can inhibit the growth speed of crystal grains, plays a role in refining the crystal grains, and further avoids the phenomenon of orange peel generated on a curved surface in the later bending process.
In the present invention, the finish annealing is preferably performed in a 1.5T annealing furnace. In the invention, the heat preservation time in the step (1) is preferably 10-30 min, more preferably 15-25 min, and most preferably 20 min; the heat preservation time in the step (3) is preferably 10-30 min, more preferably 15-25 min, and most preferably 20 min. In the present invention, the oven door is preferably closed immediately after the hot oven is charged. In the invention, the air cooling method is preferably to turn on a fan for quick cooling.
In the invention, the height of the annealing charging basket in the finished product annealing process is preferably 200-350 mm; more preferably 250-300 mm; the charging quantity of the annealing charging basket is preferably a conduit with the outer diameter being more than phi 20mm, and the basket can be filled; the diameter of phi 20mm is more than or equal to that of phi 10mm, and the charging height of each basket preferably does not exceed that of a half basket; the outer diameter is less than or equal to phi 10mm, and the loading height of each basket is preferably not more than 100 mm. When the basket is used for loading, the tubular products are preferably uniformly laid. By adopting the annealing charging basket and the furnace loading amount, good ventilation can be ensured, and annealing is more sufficient.
Compared with the prior art, the aluminum alloy catheter is prepared by adopting the lubrication-free extrusion process under the condition of the specific length of the perforation needle, and the aluminum alloy catheter with good inner surface quality is obtained under the condition of ensuring that the perforation needle is not damaged in the extrusion process.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1 is a photograph of the inner surface of an aluminum alloy catheter produced in example 1 of the present invention;
FIG. 2 is a photograph of the inner surface of an aluminum alloy pipe produced in comparative example 1 of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
Turning and boring the solid ingot to obtain a hollow ingot; the solid ingot comprises the following components: 0.06 wt% silicon; 0.16 wt% iron; 0.02 wt% copper; 0.31 wt% manganese; 2.48 wt% magnesium; 0.01 wt% titanium; the total mass content of iron and silicon is 0.22 percent; the balance being aluminum.
The cutting slope of the hollow ingot is 1.6 mm; the wall thickness difference of the hollow ingot is 1.7 mm; the bending degree of the hollow ingot is 0.5 mm; the deviation of the outer diameter of the hollow ingot is +1 mm; the deviation of the inner diameter of the hollow ingot is-0.5 mm; the length deviation of the hollow ingot is-6 mm; the roughness of the outer surface of the hollow ingot is less than or equal to Ra12.5, and the roughness of the inner surface of the hollow ingot is less than or equal to Ra6.3.
Heating the hollow ingot at 480 ℃, and then extruding the hollow ingot on a 2500T extruder to obtain a conduit blank; the extrusion is non-lubrication extrusion, and the length of the perforation needle in the extrusion process is 730 mm; the length of the hollow ingot in the extrusion process is 300mm, the inner diameter of the hollow ingot is 80mm, the outer diameter of the hollow ingot is 88mm, and the thickness of the hollow ingot is 8 mm; the extrusion speed in the extrusion process is 2m/min, the extrusion temperature is 450 ℃, and the extrusion ratio is 33.42.
Performing withdrawal and straightening on the catheter blank obtained after extrusion, wherein the stretching rate in the withdrawal and straightening process is 1.5%;
and (3) carrying out etching and washing on the product after the withdrawal and straightening, wherein the etching and washing method comprises the following steps:
blowing off the aluminum scraps in the pulled and straightened pipe by using compressed air, and sequentially carrying out clear water washing, acid washing, cold water washing (a neutralization tank), alkali washing, cold water washing (a neutralization tank), acid washing and clear water washing.
Rolling the product after the etching, wherein the rolling method is a two-roller periodic cold-rolled tube method, and the feeding amount in the rolling process is 2.0 mm; the tolerance of the outer diameter of the pipe obtained after rolling is +1 mm; the tolerance of the wall thickness of the pipe obtained after rolling is-0.07 mm; the average wall thickness tolerance of the tube obtained after rolling is +0.02 mm.
And (3) reducing annealing the rolled product, wherein the temperature of the reducing annealing is 200 ℃, and the time of the reducing annealing is 1 hour.
And drawing the product after reducing annealing, wherein the drawing method is empty drawing, and the reducing amount of each pass in the empty drawing process is 2 mm.
Straightening the drawn product to obtain an aluminum alloy conduit; the straightening method is roller straightening.
Example 2
An aluminum alloy catheter was prepared according to the method of example 1; the difference from example 1 is that, in extrusion on a 600T extruder, the length of the perforation needle is 240 mm; the length of hollow spindle is 200mm in the extrusion process, and the internal diameter of hollow spindle is 25mm, and the external diameter is 31mm, and thickness is 3 mm.
Example 3
An aluminum alloy catheter was prepared according to the method of example 1; the difference from example 1 is that the heating temperature was 430 deg.C
Example 4
An aluminum alloy catheter was prepared according to the method of example 1; the difference from example 1 is that the heating temperature was 540 ℃.
Example 5
An aluminum alloy catheter was prepared according to the method of example 1; the difference from example 1 is that the extrusion speed in the extrusion process was 0.5 m/min.
Example 6
An aluminum alloy catheter was prepared according to the method of example 1; the difference from example 1 is that the extrusion speed in the extrusion process was 3 m/min.
Comparative example 1
An aluminum alloy catheter was prepared according to the method of example 1; the difference from example 1 is that the perforation needles were coated with a lubricating oil containing graphite powder during extrusion, and the length of the perforation needles was 1030 mm.
Comparative example 2
An aluminum alloy catheter was prepared according to the method of example 2; the difference from example 2 is that the length of the piercing needle at the time of extrusion was 280 mm.
Example 7
The catheters prepared in the examples and the comparative examples of the invention are subjected to pipe cutting visual inspection to detect the quality of the inner surface of the aluminum alloy catheters prepared in the examples and the comparative examples of the invention, and the detection results are that the inner surface of the aluminum alloy catheter prepared in the example 1 is smooth and clean and has no defects of peeling, pits and the like (as shown in figure 1), the inner surface of the aluminum alloy catheter prepared in the example 2 is smooth and clean and has no defects of peeling, pits and the like, the inner surface of the aluminum alloy catheter prepared in the example 3 is smooth and clean and has defects of slight peeling, pits and the like, the inner surface of the aluminum alloy catheter prepared in the example 4 is smooth and clean and has no defects of peeling, pits and the like, the inner surface of the aluminum alloy catheter prepared in the example 5 is smooth and clean and has no defects of peeling, pits and the like, and the inner surface of the aluminum alloy catheter prepared in, The aluminum alloy conduit prepared by the embodiment of the invention has no or slight peeling and pit defects on the inner surface. The inner wall of the aluminum alloy catheter prepared in comparative example 1 has defects such as peeling and pits (as shown in fig. 2), and the root of the perforating needle is broken and the needle tip is thinned in the preparation process of comparative example 2, so that continuous production cannot be carried out.
Example 8
Turning and boring the solid ingot to obtain a hollow ingot; the solid ingot comprises the following components: 0.06 wt% silicon; 0.15 wt% iron; 0.02 wt% copper; 0.26 wt% manganese; 2.49 wt% magnesium; 0.02 wt% titanium; the total mass content of iron and silicon is 0.24%; the balance being aluminum.
The cutting slope of the hollow ingot is 1.7 mm; the wall thickness difference of the hollow ingot is 1.8 mm; the bending degree of the hollow ingot is 0.5 mm; the deviation of the outer diameter of the hollow ingot is-1 mm; the deviation of the inner diameter of the hollow ingot is +0.5 mm; the length deviation of the hollow ingot is +6 mm; the roughness of the outer surface of the hollow ingot is less than or equal to Ra12.5, and the roughness of the inner surface of the hollow ingot is less than or equal to Ra6.3.
Heating the hollow ingot at 490 ℃, and extruding the hollow ingot on an extruder at 2500T to obtain a conduit blank; the extrusion is non-lubrication extrusion, and the length of the perforation needle in the extrusion process is 730 mm; the length of the hollow ingot in the extrusion process is 300mm, the inner diameter of the hollow ingot is 80mm, the outer diameter of the hollow ingot is 88mm, and the thickness of the hollow ingot is 4 mm; the extrusion speed in the extrusion process is 2m/min, the extrusion temperature is 455 ℃, and the extrusion ratio is 26.31.
Performing withdrawal and straightening on the catheter blank obtained after extrusion, wherein the stretching rate in the withdrawal and straightening process is 1.7%;
and (3) carrying out etching and washing on the product after the withdrawal and straightening, wherein the specific method of the etching and washing comprises the following steps:
blowing off the aluminum scraps in the pulled and straightened aluminum alloy pipe by using compressed air, and sequentially carrying out clear water washing, acid washing, cold water washing (a neutralization tank), alkali washing, cold water washing (a neutralization tank), acid washing and clear water washing.
Rolling the product after the etching, wherein the rolling method is a two-roller periodic cold rolling tube method, the feeding amount in the rolling process is 3.0mm, and the tolerance of the outer diameter of the tube obtained after the rolling is-1 mm; the tolerance of the wall thickness of the pipe obtained after rolling is +0.07 mm; the average wall thickness tolerance of the tube obtained after rolling is-0.01.
And (3) performing reducing annealing on the rolled product, wherein the temperature of the reducing annealing is 202 ℃, and the time of the reducing annealing is 1 hour.
And drawing the product after reducing annealing, wherein the drawing method is empty drawing, and the reducing amount of each pass in the empty drawing process is 2 mm.
And straightening the drawn product by using a roller straightening method.
Cleaning the straightened product, wherein the cleaning method comprises the following steps:
before cleaning, blowing the aluminum scraps in the pipe by using compressed air; cleaning the pipe in hot water, lifting up and down, and the cleaning time is moderate; after the hot water is cleaned, the pipe is placed in a kerosene tank for cleaning, and the pipe is lifted up and down to clean the oil stains on the inner surface and the outer surface of the pipe, and the cleaning time is not limited.
Detecting the outer diameter, the wall thickness and the surface quality of the cleaned product;
annealing the qualified product to obtain an aluminum alloy conduit; the finished product annealing method comprises the following steps:
the method is carried out in a 1.5T annealing furnace, the temperature of the empty furnace is 480-490 ℃, and the temperature is kept for 30min after reaching the temperature; after the oven is finished, rapidly heating the oven for charging; and immediately closing the furnace door after the charging is finished, changing the furnace temperature to 430-440 ℃, preserving the heat for 10min after the temperature is reached, and keeping the temperature for no more than 65min from the closing of the furnace door to the end of the heat preservation. And after the heat preservation is finished, rapidly discharging from the furnace, and turning on a fan for rapid cooling.
The dimensional accuracy of the aluminum alloy conduit prepared in the embodiment 8 of the present invention was measured by using an outside micrometer and a wall thickness micrometer, and the measurement result showed that the outside diameter deviation of the aluminum alloy conduit prepared in the embodiment 8 of the present invention was-0.07 mm and the wall thickness difference was ± 0.08 mm.
According to the technical scheme, the quality of the inner surface of the aluminum alloy conduit prepared in the embodiment 8 of the invention is detected, and the detection result shows that the inner surface of the aluminum alloy conduit prepared in the embodiment 8 of the invention has no defects of peeling and pits.
According to the GB/T228 metal material room temperature tensile test method and GB/T3246.2 low magnification organization test method for wrought aluminum and aluminum alloy products, the tensile strength and the surface grain size of the aluminum alloy conduit prepared in the embodiment 8 of the invention are detected, and the detection result is that the tensile strength is 220-230 MPa and the grain size is grade 1. The aluminum alloy conduit prepared in the embodiment 8 of the invention has smaller grain size on the surface, and the curved surface has no orange peel phenomenon in the later bending process.
From the above embodiment, the present invention provides a method for preparing an aluminum alloy conduit with good inner surface quality, including: sequentially heating, extruding without lubrication, straightening, etching and washing, rolling, reducing and annealing, drawing and straightening the hollow ingot to obtain an aluminum alloy conduit; the length of the hollow ingot in the extrusion process is less than or equal to 350 mm; the length of the perforation needle in the extrusion process is 200-850 mm. The aluminum alloy catheter is prepared by adopting a non-lubrication extrusion process under the condition of the specific length of the perforation needle, and the aluminum alloy catheter with good inner surface quality is obtained under the condition of ensuring that the perforation needle is not damaged in the extrusion process.
Claims (4)
1. A preparation method of an aluminum alloy conduit with good inner surface quality comprises the following steps:
sequentially heating, extruding without lubrication, straightening, etching and washing, rolling, reducing and annealing, drawing and straightening the hollow ingot to obtain an aluminum alloy conduit;
the length of the hollow ingot in the extrusion process is less than or equal to 350 mm;
the length of the perforation needle in the extrusion process is 200-850 mm;
in the invention, the preparation method of the hollow ingot comprises the following steps:
turning and boring the solid ingot to obtain a hollow ingot;
in the invention, the solid ingot comprises the following components:
0.15 to 0.35 wt% of silicon;
0.15 to 0.35 wt% iron;
0.02 to 0.08 wt% of copper;
0.2 to 0.35 wt% manganese;
2.1-2.4 wt% magnesium;
0.02 to 0.12 wt% of titanium;
the total mass content of iron and silicon is 0.3-0.4%;
the balance being aluminum;
the outer diameter of the hollow ingot in the extrusion process is 30-32 mm; the inner diameter is 24-26 mm, and the wall thickness is 3.5-4.5 mm;
the extrusion speed in the extrusion process is 1-2.5 m/min;
the extrusion temperature in the extrusion process is 440-460 ℃;
the extrusion ratio in the extrusion process is 15-45;
the heating temperature is 450-520 ℃;
the temperature of the reducing annealing is 195-205 ℃; the time of reducing annealing is 0.5-1.5 hours.
2. The method according to claim 1, wherein the length of the perforation needles during the pressing is 240mm, 630mm, 730mm or 830 mm.
3. The method of claim 1, wherein the hollow ingot has a draft angle of ≦ 2 mm; the wall thickness difference of the hollow ingots is less than or equal to 2 mm; the bending degree of the hollow ingot is 0.45-0.55 mm.
4. The method of claim 1, wherein after the straightening is completed, further comprising:
and cleaning, detecting and annealing the straightened product to obtain the aluminum alloy conduit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711484792.4A CN108160744B (en) | 2017-12-29 | 2017-12-29 | Preparation method of aluminum alloy conduit with high inner surface quality |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711484792.4A CN108160744B (en) | 2017-12-29 | 2017-12-29 | Preparation method of aluminum alloy conduit with high inner surface quality |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108160744A CN108160744A (en) | 2018-06-15 |
| CN108160744B true CN108160744B (en) | 2020-02-14 |
Family
ID=62516321
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711484792.4A Active CN108160744B (en) | 2017-12-29 | 2017-12-29 | Preparation method of aluminum alloy conduit with high inner surface quality |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108160744B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113649427B (en) * | 2021-08-25 | 2023-03-07 | 西南铝业（集团）有限责任公司 | 6061 aluminum alloy thin-wall pipe forming process |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06273961A (en) * | 1993-03-23 | 1994-09-30 | Canon Inc | Production of aluminum pipe base body for electrophotography |
| CN101709403A (en) * | 2009-11-06 | 2010-05-19 | 江阴新华宏铜业有限公司 | Method for preparing brass seamless tubes by adopting hollow ingots |
| CN102312142A (en) * | 2011-09-27 | 2012-01-11 | 西南铝业（集团）有限责任公司 | Method for producing high-grade aluminum alloy thin wall tubing |
| CN102974646A (en) * | 2012-12-20 | 2013-03-20 | 西南铝业（集团）有限责任公司 | Manufacturing process of aluminum alloy water-drop-shaped thin-wall tubular material |
| CN104741413A (en) * | 2013-12-27 | 2015-07-01 | 北京有色金属研究总院 | Preparation method of super-long large thin-wall precision aluminum alloy pipe |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7736451B2 (en) * | 2004-04-16 | 2010-06-15 | Kayaba Industry Co., Ltd. | Aluminum alloy pipe and method of manufacturing same |
-
2017
- 2017-12-29 CN CN201711484792.4A patent/CN108160744B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06273961A (en) * | 1993-03-23 | 1994-09-30 | Canon Inc | Production of aluminum pipe base body for electrophotography |
| CN101709403A (en) * | 2009-11-06 | 2010-05-19 | 江阴新华宏铜业有限公司 | Method for preparing brass seamless tubes by adopting hollow ingots |
| CN102312142A (en) * | 2011-09-27 | 2012-01-11 | 西南铝业（集团）有限责任公司 | Method for producing high-grade aluminum alloy thin wall tubing |
| CN102974646A (en) * | 2012-12-20 | 2013-03-20 | 西南铝业（集团）有限责任公司 | Manufacturing process of aluminum alloy water-drop-shaped thin-wall tubular material |
| CN104741413A (en) * | 2013-12-27 | 2015-07-01 | 北京有色金属研究总院 | Preparation method of super-long large thin-wall precision aluminum alloy pipe |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108160744A (en) | 2018-06-15 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108145386B (en) | Optimized preparation method of LF2 aviation catheter | |
| CN108213110B (en) | Preparation method of conduit blank and aluminum alloy conduit | |
| CN109622873B (en) | Manufacturing process of fine crystals of 2219 aluminum alloy ring piece | |
| CN102873512B (en) | The manufacture method of thick-walled seamless steel pipes in used in nuclear power station heavy caliber | |
| CN110877186B (en) | Manufacturing method of large-specification zirconium alloy thin-walled tube and large-specification zirconium alloy thin-walled tube | |
| CN111334727B (en) | Preparation method of high-temperature alloy wire for improving yield of high-temperature alloy rivet | |
| CN107937846B (en) | Preparation method of aluminum alloy conduit with good bending property | |
| CN110125317B (en) | Forming method of high-strength stainless steel hot-rolled ring piece | |
| CN114749508B (en) | Large-caliber austenitic stainless steel seamless pipe and manufacturing method and application thereof | |
| CN115228964B (en) | Manufacturing method of nickel-based alloy small-caliber pipe for nuclear reactor pressure vessel sealing ring | |
| CN100513059C (en) | Production method of B7 heat transfer copper alloy seamless pipe | |
| CN108160744B (en) | Preparation method of aluminum alloy conduit with high inner surface quality | |
| CN115351112A (en) | Preparation method of 6061 catheter | |
| CN110538890A (en) | Manufacturing method of UNS 32906 seamless tube | |
| CN111889535B (en) | Preparation method of zirconium alloy bar | |
| CN112474806A (en) | Preparation method of internal thread special-shaped copper pipe | |
| CN112708790A (en) | Preparation method of zirconium or zirconium alloy extrusion rolling thin-wall section | |
| CN113857783B (en) | Production process of press-riveting nut | |
| CN107838222A (en) | The preparation method and applications of biological medical degradable kirsite capillary tubes | |
| CN106944493A (en) | A kind of processing method of extraordinary copper material | |
| CN114657322B (en) | Large-caliber duplex stainless steel seamless steel pipe and preparation method and application thereof | |
| CN113458176B (en) | Manufacturing method of high-precision seamless tube with outer hexagonal and inner circular special-shaped cross section for nuclear power | |
| CN110814249B (en) | Forming method of stainless steel long pipe forging | |
| CN1752472A (en) | Method for producing bearing ferrule blanks | |
| CN113416867A (en) | Preparation method of zinc alloy pipe capable of being used for degradable cardiovascular stent |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |