CN109706392A - Trailer car shaft square tube, preparation method and Trailer car shaft - Google Patents
Trailer car shaft square tube, preparation method and Trailer car shaft Download PDFInfo
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- CN109706392A CN109706392A CN201811594036.1A CN201811594036A CN109706392A CN 109706392 A CN109706392 A CN 109706392A CN 201811594036 A CN201811594036 A CN 201811594036A CN 109706392 A CN109706392 A CN 109706392A
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Abstract
The present invention provides a kind of Trailer car shaft square tube, preparation method and Trailer car shafts.Each chemical element component weight percent of the square tube are as follows: C 0.19~0.23, Si 0.20~0.37, Mn 1.55~1.68, V 0.04~0.07, Nb 0.03~0.05, Al 0.02~0.04, Ni 0.18~0.28, surplus are Fe and inevitable impurity.Cooperated by the ratio of above-mentioned each element, so that being formed by square tube with high-strength and high ductility characteristic, can satisfy the requirement of Trailer car shaft.
Description
Technical field
The present invention relates to metallurgical technology fields, in particular to a kind of Trailer car shaft square tube, preparation method and extension
Vehicle axle.
Background technique
Trailer car shaft presses forming method, can be divided into " shaft " and " three sections of axis "." shaft " using round tube as raw material, through squeeze
Pressure closes up and the molding of the processes such as the side of pushing away." three sections of axis " with square tube (each side wall and nisi plane but radius of curvature is biggish
Curved surface) it is raw material, solid spindle nose is forged in both ends welding." three sections of axis " has biggish technical advantage compared with " shaft ",
Safety coefficient is higher than " shaft "." three sections of axis " spindle nose is solid forging, bearing capacity and long service life；" three sections of axis " knot
Structure design rationally, reduces tire wear when unloaded, spindle nose is horizontal with axle body when loading, guarantees the smooth transport of cargo；" three sections
Axis " is primarily adapted for use in high-end lorry or extraordinary lorry.Manufacture " three-stage " Trailer car shaft axle body square tube will with axle accessory into
Luggage is matched, it is necessary to have good dimensional accuracy.Trailer needs to bear in motion biggish high_frequency sine wave cyclic loading,
JT/T475-2002 " Trailer car shaft " standard provides that fatigue life is not less than 800000 times, and the material for manufacturing axle needs well
Obdurability.
It is produced currently, the square tube of manufacture " three-stage " Trailer car shaft axle body is all made of sizing cold-drawn mode.Sizing cold-drawn work
Skill produces axle square tube, controls outer diameter using external mold outside hollow billet, and the inside uses special-shaped core model control wall thickness and interior
Diameter size, finished product heat treatment is using quenching, water-spraying control add-back fire process.Cold drawing square pipe is using hot-rolled capillary pipe as raw material, through acid
It washes away and carries out shaping cold-drawn after descaling, the processes such as acid washing phosphorization saponification would seriously pollute the environment.There are residual for cold deformation square tube
The FREE TORSION rigidity of residue stress, section is lower, is easy to appear torsion when by curved, and when compression is easy to appear torsional,
Torsional property is poor.Cold deformation mode is only capable of producing the square tube of small wall thickness, thickeies on the corner and not, bears the collection of locality
The ability of middle load is weak.The flow harden due to caused by continuous cold deformation rises the intensity of square tube, hardness, under tough modeling index
Drop, therefore impact property will deteriorate.
Hot rolling technology produces seamless square tube, mainly utilizes existing hot finished steel pipe production line, seamless in circular cross section hot rolling
After steel pipe process, increase by three rollers or the direct Cheng Fang of four-roller reducing mill stand.It is all that hot rolling technology eliminates acid washing phosphorization saponification cold-drawn etc.
Multi-processing process is significantly reduced environmental pollution, while reducing production cost, improves production efficiency.Four-roller square tube sizing
Machine rack is difficult general with existing three general roller round tube sizing mill racks, can only change to four-roller square tube sizing mill rack
It makes, is driven using one of three roller round tube three transmission shafts of sizing mill, limits the power output of sizing mill, can only also produce
Small wall thickness hot rolling square tube.Three roller square tube sizing mill racks and three roller round tube sizing mill racks are completely compatible, can give full play to round tube
The deformability of sizing mill, hot rolling square tube specification wide coverage.But the three roller square tube sizing mill breast roller roller sides side of being intersected in
In the middle part of pore type side length, deformed area metal can flow out from roll gap when rolling square tube, will form one in the middle part of square tube side length and dash forward
Seamed edge out is not able to satisfy axle square tube high dimensional accuracy requirement.
Summary of the invention
The main purpose of the present invention is to provide a kind of Trailer car shaft square tube, preparation method and Trailer car shafts, to mention
For a kind of Trailer car shaft of novel high-strength and high ductility.
To achieve the goals above, according to an aspect of the invention, there is provided a kind of Trailer car shaft square tube, the square tube
Each chemical element component weight percent are as follows: C 0.19~0.23, Si 0.20~0.37, Mn 1.55~1.68, V 0.04
~0.07, Nb 0.03~0.05, Al 0.02~0.04, Ni 0.18~0.28, surplus are Fe and inevitable impurity.
Further, above-mentioned Trailer car shaft is three sections of axis, and the rolling mill practice of square tube is hot rolling.
According to another aspect of the present invention, a kind of preparation method of Trailer car shaft square tube, the preparation method are provided
Include: to heat to steel billet, obtains hot base, each chemical element component weight percent of steel billet are as follows: C 0.19~
0.23, Si 0.20~0.37, Mn 1.55~1.68, V 0.04~0.07, Nb 0.03~0.05, Al 0.02~0.04, Ni
0.18~0.28, surplus is Fe and inevitable impurity；Hot piercing and rolling are successively carried out to hot base, obtain hollow forging；To famine
Pipe carries out fixed side, obtains square tube.
Further, fixed side is carried out to above-mentioned hollow forging using the side's of determining device, fixed side's device include: along tubing conveying direction according to
One or more round tube roller mills of secondary setting and one or more square tube roller mills, each square tube roller mill includes: rack；Three groups
Roll portion, every group of roll portion all have the roll of an active movement, and each roll is respectively provided on the rack, in three groups of roll portions
Three rolls include first roll, second roll and 3rd roll, and the axis of each roll intersects in the same plane, each roll
Square hole is formed after knurling combination, each side wall of square hole is curved wall, and the axis of first roll is horizontally disposed,
The knurling of second roll and 3rd roll is symmetrical arranged along the perpendicular bisector of the knurling of first roll and the axis of each roll
Line is crossed to form equilateral triangle, and the knurling of first roll constitutes the adjacent two side walls of square hole, second roll
Knurling and the knurling of 3rd roll constitute each one in other two side wall of square hole.
Further, above-mentioned round tube roller mill be one, square tube roller mill be it is multiple, along tubing conveying direction, square tube is rolled
Roller machine aperture is sequentially reduced, radius of curvature successively increases.
Further, the total reduction of above-mentioned square tube roller mill is 12~15%, along tubing conveying direction, square tube roller mill
Reduction ratio be followed successively by 1.2~1.5%, 6.0~8.0%, 5.0~6.0%.
Further, the above-mentioned process heated to steel billet includes successively carrying out preheating with furnace to steel billet, being segmented
Heating and soaking obtain hot base, and preferably segmented heating includes five Duan Jiare, wherein the temperature of one section of heating is 850~940 DEG C, add
Heat two sections temperature be 980~1080 DEG C, heating three sections temperature be 1130~1170 DEG C, heating four sections temperature be 1230~
1280 DEG C, the temperature of five sections of heating is 1230~1280 DEG C, and preferably the temperature of soaking is 1220~1270 DEG C, is further preferably added
The time of heat treatment is 1.5~4h.
Further, above-mentioned hot piercing is cone-type piercer, and preferably rolling is rolled using tandem mill.
Further, the capillary outer diameter that above-mentioned cone-type piercer obtains is respectively
With The aperture for the tandem mill being corresponding in turn to capillary outer diameter is
According to an aspect of the invention, there is provided a kind of Trailer car shaft, which is three sections of axis, and Trailer car shaft is adopted
It is made with the square tube that any of the above-described kind of preparation method is prepared.
It applies the technical scheme of the present invention, the main function of carbon is as gap solid solution element, to improve the intensity of cast steel.
But excessively high carbon can reduce plasticity, toughness, especially plasticity；And too low carbon then needs to increase intensity element such as manganese, molybdenum.
From the matching angle of performance and cost, it is 0.19%~0.23% that the application, which controls phosphorus content,.The effect of silicon is mainly being made steel
In the process as reducing agent and deoxidier carry out using.But excessively high silicon can strengthen austenite and higher content, cause tough
Property reduce, therefore control silicon content be 0.20%~0.37%.Manganese is the effective element for improving alloy cast steel intensity, can be had
Effect improves the low-temperature impact toughness of cast steel and can improve weld seam low-temperature flexibility.Too low manganese then will lead to intensity deficiency, because
The content of this control manganese is 1.55%~1.68%.Vanadium, niobium and aluminium is compound can refine crystal grain, therefore controlling V content is 0.04
~0.07%, Nb content is 0.03~0.05%, Al content is 0.02~0.04%, to give full play to mutual mating reaction.
Nickel is for improving harden ability and intensity, and control is 0.18~0.28% more stably to meet the requirement under low temperature.By above-mentioned
The ratio of each element cooperates, so that being formed by square tube with high-strength and high ductility characteristic, can satisfy the requirement of Trailer car shaft.
Detailed description of the invention
The accompanying drawings constituting a part of this application is used to provide further understanding of the present invention, and of the invention shows
Examples and descriptions thereof are used to explain the present invention for meaning property, does not constitute improper limitations of the present invention.In the accompanying drawings:
Fig. 1 shows the structural schematic diagram of square tube roller mill according to an embodiment of the present.
Wherein, the above drawings include the following reference numerals:
1, rack；21, first roll；22, second roll；23,3rd roll.
Specific embodiment
It should be noted that in the absence of conflict, the features in the embodiments and the embodiments of the present application can phase
Mutually combination.The present invention will be described in detail below with reference to the accompanying drawings and embodiments.
As the application background technique is analyzed, the square tube of the Trailer car shaft of three sections of axis needs good obdurability, this Shen
It please provide a kind of Trailer car shaft square tube, preparation method and Trailer car shaft.
In a kind of typical embodiment of the application, a kind of Trailer car shaft square tube, each chemistry member of square tube are provided
Plain composition by weight percent are as follows: C 0.19~0.23, Si 0.20~0.37, Mn 1.55~1.68, V 0.04~0.07, Nb
0.03~0.05, Al 0.02~0.04, Ni 0.18~0.28, surplus are Fe and inevitable impurity.
The main function of carbon is as gap solid solution element, to improve the intensity of cast steel.But excessively high carbon can reduce modeling
Property, toughness, especially plasticity；And too low carbon then needs to increase intensity element such as manganese, molybdenum.From the matching angle of performance and cost
Degree, it is 0.19%~0.23% that the application, which controls phosphorus content,.The effect of silicon as reducing agent and takes off mainly in steelmaking process
Oxygen agent carry out using.But excessively high silicon can strengthen austenite and higher content, and toughness is caused to reduce, therefore control containing for silicon
Amount is 0.20%~0.37%.Manganese is the effective element for improving alloy cast steel intensity, can effectively improve the low-temperature impact of cast steel
Toughness and weld seam low-temperature flexibility can be improved.Too low manganese then will lead to intensity deficiency, therefore the content for controlling manganese is
1.55%~1.68%.Vanadium, niobium and aluminium is compound can refine crystal grain, therefore control that V content is 0.04~0.07%, Nb content is
0.03~0.05%, Al content is 0.02~0.04%, to give full play to mutual mating reaction.Nickel for improve harden ability and
Intensity, control is 0.18~0.28% more stably to meet the requirement under low temperature.Cooperated by the ratio of above-mentioned each element, is made
Square tube must be formed by with high-strength and high ductility characteristic, can satisfy the requirement of Trailer car shaft.
It is preferred that above-mentioned Trailer car shaft is three sections of axis, the rolling mill practice of above-mentioned square tube is hot rolling.Hot rolling square tube and cold deformation side
Pipe is compared, and same breed and specification have the advantages that bigger sectional area, lesser inside and outside fillet and geometric dimension are reasonably distributed,
With better load-carrying properties；And thermal deformation square tube residual stress is small, low temperature impact properties are more preferable, ductile-brittle transition temperature is lower.
The square tube of cold deformation production is since technique limits, a possibility that there are biggish brittle crackings, and when welding need to be avoided may brittleness
Fracture area, and the above problem is not present in hot rolling square tube.
In another typical embodiment of the application, a kind of preparation method of Trailer car shaft square tube is provided, it should
Preparation method includes: to heat to steel billet, obtains hot base, each chemical element component weight percent of steel billet are as follows: C
0.19~0.23, Si 0.20~0.37, Mn 1.55~1.68, V 0.04~0.07, Nb 0.03~0.05, Al 0.02~
0.04, Ni 0.18~0.28, surplus are Fe and inevitable impurity；Hot piercing and rolling are successively carried out to hot base, obtain famine
Pipe；Fixed side is carried out to hollow forging, obtains square tube.
For hot rolling square tube compared with cold deformation square tube, same breed and specification have bigger sectional area, lesser inside and outside circle
The advantages of angle and geometric dimension are reasonably distributed has better load-carrying properties；And thermal deformation square tube residual stress is small, low-temperature impact
Performance is more preferable, and ductile-brittle transition temperature is lower.Cold deformation production square tube due to technique limit, there are biggish brittle cracking can
Can property, when welding need to avoid may brittle cracking region, and the above problem is not present in hot rolling square tube.Therefore the steel billet member of the application
Element composition is so that steel billet has the high-strength and high ductility characteristic under low temperature, while making the height of steel billet using hot piercing and hot rolling mode
Strong high-ductility performance is given full play to, to make to be formed by Trailer car shaft square tube with the high-strength and high ductility performance under low temperature.
In order to improve the dimensional accuracy of square tube, it is preferred to use fixed side's device carries out fixed side to hollow forging, as shown in Figure 1, this is fixed
Square device includes: the one or more round tube roller mills and one or more square tube rolls set gradually along tubing conveying direction
Machine, each square tube roller mill include: rack 1；Three groups of roll portions, every group of roll portion all have the roll of an active movement, respectively roll
Roller is arranged in rack 1, and three rolls in three groups of roll portions include first roll 21, second roll 22 and 3rd roll
23, the axis of each roll intersects in the same plane, forms square hole, each side wall of square hole after the knurling combination of each roll
Axis for curved wall, first roll 21 is horizontally disposed, and the knurling of second roll 22 and 3rd roll 23 is along
The perpendicular bisector of the knurling of one roll 21 is symmetrical arranged and the axis of each roll is crossed to form equilateral triangle, and first rolls
The knurling of roller 21 constitutes the adjacent two side walls of square hole, section and the 3rd roll 23 of the knurling of second roll 22
The section of knurling is mutually perpendicular to, and the knurling of second roll 22 and the knurling of 3rd roll 23 constitute other the two of square hole
Each one in a side wall.Each roller slot is intersected at the angle square tube pass R, and deformed area metal will not be from roll gap when rolling square tube
Place's outflow, not will form a seamed edge outstanding in the middle part of square tube side length, is able to satisfy axle completely and is wanted with square tube high dimensional accuracy
It asks；Each roll portion all has the roll of an active movement, can provide enough rolling torsions for square tube sizing, meet heavy wall
The sizing of square tube needs.The above-mentioned square tube roller mill of the application can use the rack of existing three rollers round tube roller mill, change
The roll groove shape of each roll, therefore be easily achieved.
In a kind of preferred embodiment, above-mentioned round tube roller mill be one, square tube roller mill be it is multiple, along tubing convey
Direction, square tube roller mill aperture is sequentially reduced, radius of curvature successively increases.Preliminary sizing is carried out using round tube roller mill, then
Sizing is successively carried out using multiple square tube roller mills, improves the stability of each roller mill work and the accuracy of sizing.
In order to further increase gained square tube dimensional accuracy, preferably the total reduction of square tube roller mill be 12~15% with
Obtain the square tube of surfacing.Along tubing conveying direction, the reduction ratio of square tube roller mill is followed successively by 1.2~1.5%, 6.0~
8.0%, 5.0~6.0%.Each reduction ratio of above-mentioned each square tube roller mill is within 8.0%, convenient for each roller mill for hollow billet
It bites and the control of size, and avoids and deform the excessive dimensional accuracy for causing finished product in Sizing Process and resistance to torsion is deteriorated
The problem of appearance.
In one embodiment, the process heated to steel billet includes successively carrying out preheating with furnace to steel billet, dividing
Duan Jiare and soaking obtain hot base, and preferably segmented heating includes five Duan Jiare, wherein the temperature of one section of heating is 850~940 DEG C,
The temperature of two sections of heating is 980~1080 DEG C, and the temperature of three sections of heating is 1130~1170 DEG C, and the temperature of four sections of heating is 1230
~1280 DEG C, the temperature of five sections of heating is 1230~1280 DEG C, and preferably the temperature of soaking is 1220~1270 DEG C, further preferably
The time of heat treatment is 1.5~4h.By above-mentioned segmentally heating, steel billet is made to be stepped up to soaking temperature, avoids liter
Warm excessive velocities cause the defect cracked in hot base.
Additionally, it is preferred that above-mentioned hot piercing is cone-type piercer, the deformability of cone-type piercer is big, and hollow forging geometric dimension is flexible,
Precision height and high production efficiency.It is preferred that rolling is rolled using tandem mill, intensity, the hardness for avoiding cold rolling square tube are higher, tough
The lower problem of plasticity has preferable impact property；Moreover, can realize consecutive production using above-mentioned production technology, produce
Efficiency is higher.Conic perforator and tandem mill coordinating operation, can not only obtain mechanical performance, more evenly property, resistance to torsion are stronger
Square tube, and can be improved the production efficiency of square tube, realize the extensive efficient production of square tube.
Preferably, when the capillary outer diameter that cone-type piercer obtains is respectivelyWith
When, the aperture for the tandem mill being corresponding in turn to capillary outer diameter is
Above-mentioned preparation method is formed, herein not after forming square tube according to the technique of Trailer car shaft routine
It repeats again.
In the application in another typical embodiment, a kind of Trailer car shaft is provided, which is three sections of axis,
Trailer car shaft is made using the square tube that any of the above-described kind of preparation method is prepared.It is prepared using the preparation method of the application
Made of Trailer car shaft have high-strength and high ductility performance.
Complete square tube production process is as follows:
Sawing → annular stove heating → hot piercing → tandem rolling → stepping furnace reheating → high-pressure water descaling → fixed side →
Cold bed cooling → crop end → physical and chemical inspection qualification → gag press straightening → nondestructive inspection → cut scale → desk checking → spray word →
It is packed and stored.
It is rolled in Hualing Steel Tube Co., Ltd., Hengyang City's Φ 340MPM Continuous mill train.Following embodiment to hot piercing,
Tandem rolling, fixed side illustrate.
Embodiment 1
In the Trailer car shaft that low temperature environment uses chemical element component weight percent each in square tube material are as follows: C 0.19
~0.23, Si 0.20~0.37, Mn 1.55~1.68, V 0.04~0.07, Nb 0.030~0.050, Al 0.020~
0.040,0.18~0.28 Ni, surplus are Fe and inevitable impurity.
For making the square tube of 150 × 150 × 11mm specification, the specific steps of which are as follows:
A, it is produced using Ф 250mm blank.Heating steel billet point preheating, heating, equal thermal process.Preheating temperature is with furnace temperature；Add
Heat is divided into five sections: one section 900 DEG C ± 10 DEG C of temperature of heating heats 1030 DEG C ± 10 DEG C of two sections of temperature, heats three sections of temperature 1150
DEG C ± 10 DEG C, heat four, five sections 1260 DEG C ± 10 DEG C of temperature；1250 DEG C ± 10 DEG C of soaking section temperature, total heating time 2~2.5
Hour.
B, tube rolling is using conic perforator perforation, continuous rolling-tube unit rolling.Production square tube needed for pierced shell specification be×21mm；Devise continuous rolling-tube unitPass, after tandem rolling hollow forging having a size of
C, sizing mill is using+3 square tube rack tissue productions of round tube rack, square tube sizing mill roll pass curve such as Fig. 1
It is shown.Round hollow billet is through circular hole rack sizing, hot-rolled capillary pipe specificationAlong tubing traffic direction, square tube is fixed
Diameter machine roll pass diameter is followed successively by 172.5mm, 159mm and 150.7mm；Square tube sizing mill roll single chassis reduction ratio is respectively
1.43%, 7.83% and 5.22%；Square tube rack total reduction is 13.88%；Square tube breast roller curve curvature radius range
For 210mm, 700mm and 2300mm.Classical prescription pore type rack sizing, produce seamless hot rolling square tube specification be 150 × 150 ×
11mm。
The specification and revolving speed of the square tube roller mill of the sequencing arrangement passed through by round tube are shown in Table 1.
Table 1
Comparative example 1
Difference from Example 1 is, Trailer car shaft chemical element component weight percent each in square tube material are as follows:
C 0.25~0.30, Si 0.20~0.37, Mn 1.0~1.2, V 0.04~0.07, Nb 0.030~0.050, Al 0.020
~0.040, surplus is Fe and inevitable impurity.
Comparative example 2
Difference from Example 1 is, Trailer car shaft chemical element component weight percent each in square tube material are as follows:
C 0.19~0.23, Si 0.20~0.37, Mn 1.55~1.68, V 0.04~0.07, Nb 0.03~0.05, Al 0.020
~0.040, surplus is Fe and inevitable impurity.
Any two square tubes of each embodiment and comparative example are chosen, and test their geometric dimension and power at room temperature
Performance is learned, geometric dimension test result is shown in Table 2, according to specified in " standard method and definition of steel product mechanical property test "
Method carries out tension test to the square tube of embodiment and comparative example and impact test, mechanical experimental results are shown in Table 3.
Table 2
Table 3
It can be seen from the data in table 2 and table 3 the various geometric dimensions of the seamless square tube of Micro Alloying hot rolling of the application and
Mechanical property is able to satisfy the manufacture and use requirement of Trailer car shaft.
It can be seen from the above description that the above embodiments of the present invention realized the following chievements:
The main function of carbon is as gap solid solution element, to improve the intensity of cast steel.But excessively high carbon can reduce modeling
Property, toughness, especially plasticity；And too low carbon then needs to increase intensity element such as manganese, molybdenum.From the matching angle of performance and cost
Degree, it is 0.19%~0.23% that the application, which controls phosphorus content,.The effect of silicon as reducing agent and takes off mainly in steelmaking process
Oxygen agent carry out using.But excessively high silicon can strengthen austenite and higher content, and toughness is caused to reduce, therefore control containing for silicon
Amount is 0.20%~0.37%.Manganese is the effective element for improving alloy cast steel intensity, can effectively improve the low-temperature impact of cast steel
Toughness and weld seam low-temperature flexibility can be improved.Too low manganese then will lead to intensity deficiency, therefore the content for controlling manganese is
1.55%~1.68%.Vanadium, niobium and aluminium is compound can refine crystal grain, therefore control that V content is 0.04~0.07%, Nb content is
0.03~0.05%, Al content is 0.02~0.04%, to give full play to mutual mating reaction.Nickel for improve harden ability and
Intensity, control is 0.18~0.28% more stably to meet the requirement under low temperature.Cooperated by the ratio of above-mentioned each element, is made
Square tube must be formed by with high-strength and high ductility characteristic, can satisfy the requirement of Trailer car shaft.
The foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention, for the skill of this field
For art personnel, the invention may be variously modified and varied.All within the spirits and principles of the present invention, made any to repair
Change, equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (10)
1. a kind of Trailer car shaft square tube, which is characterized in that each chemical element component weight percent of the square tube are as follows: C
0.19~0.23, Si 0.20~0.37, Mn 1.55~1.68, V 0.04~0.07, Nb 0.03~0.05, Al 0.02~
0.04, Ni 0.18~0.28, surplus are Fe and inevitable impurity.
2. Trailer car shaft square tube according to claim 1, which is characterized in that the Trailer car shaft is three sections of axis, described
The rolling mill practice of square tube is hot rolling.
3. a kind of preparation method of Trailer car shaft square tube, which is characterized in that the preparation method includes:
Steel billet is heated, hot base, each chemical element component weight percent of the steel billet are obtained are as follows: C 0.19~
0.23, Si 0.20~0.37, Mn 1.55~1.68, V 0.04~0.07, Nb 0.03~0.05, Al 0.02~0.04, Ni
0.18~0.28, surplus is Fe and inevitable impurity；
Hot piercing and rolling are successively carried out to the hot base, obtain hollow forging；
Fixed side is carried out to the hollow forging, obtains square tube.
4. preparation method according to claim 3, which is characterized in that fixed side is carried out to the hollow forging using fixed square device,
The fixed square device includes: the one or more round tube roller mills set gradually along tubing conveying direction and one or more square tubes
Roller mill, each square tube roller mill include:
Rack (1)；
Three groups of roll portions, every group of roll portion all have the roll of an active movement, and each roll is arranged at the rack
(1) on, three rolls in three groups of roll portions include first roll (21), second roll (22) and 3rd roll (23), each institute
The axis for stating roll intersects in the same plane, forms square hole after the knurling combination of each roll, the square hole
Each side wall is curved wall, and the axis of the first roll (21) is horizontally disposed, the second roll (22) and described
The knurling of 3rd roll (23) is symmetrical arranged along the perpendicular bisector of the knurling of the first roll (21) and each described rolls
The axis of roller is crossed to form equilateral triangle, and the knurling of the first roll (21) constitutes adjacent two of the square hole
In addition a side wall, the knurling of the second roll (22) and the knurling of the 3rd roll (23) constitute the square hole
Each one in two side walls.
5. the preparation method according to claim 4, which is characterized in that the round tube roller mill is one, and the square tube is rolled
Roller machine be it is multiple, along the tubing conveying direction, square tube roller mill aperture is sequentially reduced, radius of curvature successively increases.
6. preparation method according to claim 5, which is characterized in that the total reduction of the square tube roller mill be 12~
15%, along the tubing conveying direction, the reduction ratio of the square tube roller mill is followed successively by 1.2~1.5%, 6.0~8.0%, 5.0
~6.0%.
7. the preparation method according to claim 4, which is characterized in that the process heated to steel billet includes
The steel billet is successively carried out to obtain the hot base with furnace preheating, segmentally heating and soaking, the preferably described segmentally heating includes five
Duan Jiare, wherein the temperature of one section of heating is 850~940 DEG C, the temperature of two sections of heating is 980~1080 DEG C, three sections of heating
Temperature is 1130~1170 DEG C, and the temperature of four sections of heating is 1230~1280 DEG C, and the temperature of five sections of heating is 1230~1280 DEG C,
It is preferred that the temperature of the soaking is 1220~1270 DEG C, the time of the further preferred heat treatment is 1.5~4h.
8. the preparation method according to claim 4, which is characterized in that the hot piercing is cone-type piercer, preferably described to roll
System is rolled using tandem mill.
9. preparation method according to claim 8, which is characterized in that the capillary outer diameter that the cone-type piercer obtains is respectively WithThe aperture for the tandem mill being corresponding in turn to the capillary outer diameter
For
10. a kind of Trailer car shaft, which is characterized in that the Trailer car shaft is three sections of axis, and the Trailer car shaft uses claim 3
The square tube being prepared to preparation method described in any one of 9 is made.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811594036.1A CN109706392B (en) | 2018-12-25 | 2018-12-25 | Square tube for trailer axle, preparation method thereof and trailer axle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811594036.1A CN109706392B (en) | 2018-12-25 | 2018-12-25 | Square tube for trailer axle, preparation method thereof and trailer axle |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109706392A true CN109706392A (en) | 2019-05-03 |
| CN109706392B CN109706392B (en) | 2020-08-21 |
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| CN201811594036.1A Active CN109706392B (en) | 2018-12-25 | 2018-12-25 | Square tube for trailer axle, preparation method thereof and trailer axle |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109702014A (en) * | 2018-12-25 | 2019-05-03 | 衡阳华菱钢管有限公司 | The fixed square device of Trailer car shaft, Trailer car shaft and preparation method thereof |
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| CN101629476A (en) * | 2009-08-05 | 2010-01-20 | 天津钢管集团股份有限公司 | High strength and high toughness petroleum casing pipe capable of bearing low temperature within -40 to -80 |
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| CN109702014A (en) * | 2018-12-25 | 2019-05-03 | 衡阳华菱钢管有限公司 | The fixed square device of Trailer car shaft, Trailer car shaft and preparation method thereof |
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| CN109706392B (en) | 2020-08-21 |
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