CN114196803B

CN114196803B - GH2132 alloy asymmetric-section special-shaped wire for fastener and preparation method thereof

Info

Publication number: CN114196803B
Application number: CN202111369530.XA
Authority: CN
Inventors: 黄烁; 张晓敏; 马锦龙; 段然; 刘吉猛; 陈石富; 秦鹤勇
Original assignee: XINGHUA DAINAN HUALONG METAL CRAFT PRODUCTS FACTORY; Gaona Aero Material Co Ltd
Current assignee: XINGHUA DAINAN HUALONG METAL CRAFT PRODUCTS FACTORY; Gaona Aero Material Co Ltd
Priority date: 2021-11-16
Filing date: 2021-11-16
Publication date: 2024-04-19
Anticipated expiration: 2041-11-16
Also published as: CN114196803A

Abstract

The application relates to the field of superalloy processing, and particularly discloses a GH2132 alloy asymmetric cross-section special-shaped wire for a fastener and a preparation method thereof. The section of the asymmetric section special-shaped wire comprises a first section and a second section; the first section is rectangular, and the second section is hexagonal. The preparation method comprises the steps of material selection, bright annealing, flattening, bright annealing, cold rolling, bright annealing, cold drawing, bright annealing and the like. The asymmetric section special-shaped wire prepared by the method is suitable for occasions other than the symmetric section special-shaped wire, and has the advantages of high dimensional accuracy, high tensile strength, high yield and the like.

Description

GH2132 alloy asymmetric-section special-shaped wire for fastener and preparation method thereof

Technical Field

The application relates to the technical field of high-temperature alloy processing, in particular to a preparation method of GH2132 alloy asymmetric cross-section special-shaped wires for fasteners.

Background

A fastener, also referred to in the marketplace as a standard, is a mechanical element that mechanically secures or bonds two or more elements together. It features various kinds and specifications, different performance and usage, and high standardization, serialization and universalization degree.

Fasteners are the most widely used mechanical foundation and are in great demand. The performance, shape and size of the fastener are more demanding in aerospace. At present, the GH2132 alloy round wire or the special-shaped wire with symmetrical cross sections such as hexagonal, trapezoidal, rectangular and the like is most applied, and the partial use requirement can be met. However, special shaped wires used in special parts or special shapes, such as special shaped wires with width less than 5mm, thickness less than 1mm and asymmetric cross section, cannot be produced by adopting the traditional process.

Disclosure of Invention

The application provides a GH2132 alloy asymmetric section special-shaped wire for a fastener and a preparation method thereof, in order to provide the asymmetric section special-shaped wire with high dimensional accuracy, high performance and low rejection rate.

In a first aspect, the application provides a GH2132 alloy asymmetric cross-section special-shaped wire for a fastener, which adopts the following technical scheme:

A GH2132 alloy asymmetric cross-section profiled wire for a fastener, the cross-section of the asymmetric cross-section profiled wire comprising a first cross-section and a second cross-section; the first section is rectangular, the length of the long side is C, the width of the short side is T1, and C is more than T1; the second section is hexagonal, the length of the longest side is B, and the second side, the third side, the fourth side, the fifth side and the sixth side are clockwise in sequence; the second side of the second section and the short side of the first section are shared sides, the longest side of the second section and the long side of the first section are collinear, the second side and the sixth side are respectively perpendicular to the longest side, the fourth side is parallel to the longest side, and the distance between the fourth side and the longest side is T2, and T2 is more than T1; the included angle between the third side and the fourth side is 135 degrees, the included angle between the fifth side and the fourth side is 155 degrees, the length of the sixth side is A, and T2 is more than A and more than T1; in addition, the total length of the asymmetric section profile wire is l=c+b.

By adopting the technical scheme, the asymmetric section special-shaped wire with the width smaller than 5mm and the thickness smaller than 1mm is provided by the application, and is suitable for application occasions other than regular special-shaped wires. However, the shape of the asymmetric section special-shaped wire is relatively complex, and the method cannot be realized by using the traditional production and preparation method, or the produced asymmetric section special-shaped wire has the problems of poor performance, low dimensional accuracy, low qualification rate and wire breakage.

In a second aspect, the application provides a preparation method of GH2132 alloy asymmetric cross-section special-shaped wire for a fastener, which adopts the following technical scheme:

A preparation method of GH2132 alloy asymmetric section special-shaped wire for a fastener sequentially comprises the steps of selecting materials, bright annealing, flattening, bright annealing, cold rolling, bright annealing, cold drawing and bright annealing, wherein round wires made of GH2132 alloy are adopted as raw materials, and the cross section area of the round wires is 1-1.5 times of that of the asymmetric section special-shaped wire;

Flattening, namely flattening the round wire to obtain a flat wire, wherein the flattening can be divided into 1-3 times, and the reduction deformation of each time is 30-60%; cold rolling: comprises a first cold rolling step and a second cold rolling step; firstly, cold rolling, namely preparing flat wires into special-shaped wires by using a plane roller and a first roller; secondly, cold rolling, namely preparing the special-shaped wire into a semi-finished product of the special-shaped wire with the asymmetric cross section by using a plane roller and a second roller; cold drawing, namely finishing the asymmetric section special-shaped wire semi-finished product by using a cold drawing die to obtain the asymmetric section special-shaped wire, wherein the size of the finished product is reduced by 0.01-0.05 mm;

The bright annealing is heated to 950-1100 ℃ in a hydrogen annealing furnace, kept for 10-60 s and then air-cooled.

Preferably, in the flattening step, the flat filaments obtained after each pass of flattening need bright annealing treatment.

By adopting the technical scheme, the GH2132 superalloy is Fe-25 Ni-15 Cr-based superalloy, and is comprehensively reinforced by adding molybdenum, titanium, aluminum, vanadium and trace boron. The alloy has high yield strength, durability and creep strength below 650 ℃, has better processing plasticity and satisfactory welding performance, and can be better applied to aerospace fasteners.

Round wires prepared from GH2132 high-temperature alloy are used as raw materials for preparing asymmetric-section special-shaped wires. Firstly, carrying out bright annealing on round wires, heating to 950-1100 ℃ in a hydrogen annealing furnace, preserving heat for 10-60 s, then air-cooling, carrying out 1-3 times of flattening, preparing the round wires into flat wires, and carrying out bright annealing after each time of flattening; then cold rolling is carried out in two steps, the flat wire is prepared into special-shaped wire by using a first roller and a plane roller, and the special-shaped wire is subjected to bright annealing; cold rolling, namely preparing the special-shaped wire into a special-shaped wire semi-finished product with an asymmetric section by using a second roller and a plane roller, and carrying out bright annealing on the special-shaped wire semi-finished product with the asymmetric section; and finally, cold drawing is carried out, and under the action of the tensile force, the asymmetric section special-shaped wire semi-finished product passes through a cold drawing die to be finished, so that the asymmetric section special-shaped wire is obtained. After cold drawing treatment, the asymmetric section special-shaped wire is more precise. According to different specifications and precision requirements, different cold drawing dies can be replaced to obtain asymmetric section special-shaped wires with different sizes, so that the use requirements of different occasions are met.

The bright annealing is to anneal under the high temperature reducing atmosphere, the asymmetric section special-shaped wire is not oxidized, and the surface is still in a bright state after the high temperature annealing. Heating to 950-1100 ℃ in a hydrogen annealing furnace, preserving heat for 10-60 s, and then air cooling, so that the performance of the asymmetric section special-shaped wire can be improved, the hardness can be reduced, and the plasticity can be improved, thereby being beneficial to later cutting and cold deformation processing. The bright annealing is carried out before each step of operation, so that the extensibility of the irregular wire with the asymmetric section can be increased, and the possibility of cracking of the irregular wire with the asymmetric section is reduced or prevented, thereby ensuring the yield when the irregular wire with the asymmetric section is prepared by using round wires.

Preferably, in the flattening step, the flattening is performed for 2 times, and the reduction deformation of each time of flattening is preferably 40-45%.

By adopting the technical scheme, the production efficiency and the yield are directly affected by the pass and the deformation of the flattening, and when the flattening and the reduction deformation of one pass are increased, the production time is increased and the production efficiency is reduced. When flattening is carried out for 1 pass, the possibility of cracking of the irregular wire with the asymmetric section is increased when the deformation is large, so that the yield of the irregular wire with the asymmetric section is reduced. Preferably 2 passes of flattening, and the reduction deformation of each pass of flattening is preferably 40-45%.

Preferably, the height of the flat wire in the flattening step is T2+0.02-0.1 mm.

By adopting the technical scheme, the cross section area of the round wire is 1 to 1.5 times of the cross section area of the special-shaped wire with the asymmetric cross section. Round wires with different sizes are selected according to different use requirements or different specifications. When the sectional area of the round wire is smaller than 1 time of the sectional area of the asymmetric section special-shaped wire, the shape of the asymmetric section special-shaped wire is incomplete after flattening and cold rolling. When the sectional area of the round wire is larger than 1.5 times of the sectional area of the irregular wire with the asymmetric section, a large number of defects such as burrs and burrs can be generated after flattening and cold rolling, so that the accuracy of the irregular wire with the asymmetric section is lower; when the burrs and burrs are removed, a large amount of manpower and material resources are wasted, and the production cost is increased. Similarly, the above problems also occur when the height of the flat wire exceeds or falls below the maximum distance T2+0.02-0.1 mm of the asymmetric section profile wire dimension. Therefore, the dimensions of round and flat wires need to be tightly controlled.

Preferably, the first roller is provided with a first ring groove on the circumferential surface, the bottom surface of the first ring groove is an arc surface, the distance between the arc surface and the axis of the first roller is reduced and increased along the axial direction of the first roller, and the maximum distance between the arc surface and the first ring groove is offset from the axial middle of the first roller.

Preferably, the maximum distance from the cambered surface to the circumferential surface of the first roller is T2+0.01-0.08 mm, and the minimum distance is T1+0.03-0.1 mm.

By adopting the technical scheme, the first annular groove is formed in the first roller, the bottom surface of the first annular groove is an arc surface, the bulge of the arc surface is arranged towards the central axis of the first roller, the highest position of the bulge is the maximum distance from the circumferential surface of the first roller, the distance from the maximum distance to the two sides is gradually reduced, and the maximum distance is arranged at the middle part of the axial direction of the first roller. The maximum distance of the first roller is T2+0.01-0.08 mm, and the minimum distance is T1+0.03-0.1 mm. And preparing the flat wire into the special-shaped wire by using the first roller and the plane roller, wherein the shape and the size of the special-shaped wire are consistent with those of the ring groove.

Preferably, a second annular groove for extrusion molding of the irregular wire semi-finished product with the asymmetric section is formed in the peripheral surface of the second roller.

Preferably, the deepest part of the second roller in the second cold rolling step is the largest distance T2+0.01-0.06 mm of the irregular wire with the asymmetric section, the shallowest part is the smallest distance T1+0.01-0.06 mm of the irregular wire with the asymmetric section, and the length is the irregular wire with the asymmetric section L+0.01-0.08 mm.

By adopting the technical scheme, the second-step cold rolling is carried out on the special-shaped wire by utilizing the second roller and the plane roller, and the semi-finished product of the special-shaped wire with the asymmetric section is prepared. The second roller is provided with a second annular groove, and the shape of the second annular groove is consistent with the shape of the irregular wire with the asymmetric section. But the deepest part of the second roller is the largest distance T2+0.01-0.06 mm of the irregular wire with the asymmetric section, the shallowest part is the smallest distance T1+0.01-0.06 mm of the irregular wire with the asymmetric section, and the length is the irregular wire with the asymmetric section L+0.01-0.08 mm.

Preferably, the heating temperature of the bright annealing is 950-1100 ℃, and the heat preservation time is 45-60 s.

By adopting the technical scheme, when the heating temperature is lower than 950 ℃, the tissue variation in the wire is less, and the performance can not meet the use requirement. Too low a temperature may also lead to an increase in the cracking properties of the subsequent flattening, cold rolling and cold drawing. When the heating temperature is higher than 1100 ℃, the grains in the wire material gradually grow up along with the temperature rise, and finally the performance of the asymmetric section special-shaped wire is reduced, so that the use requirement cannot be met. The heat preservation time also affects the performance of the irregular wire with the asymmetric section, when the heat preservation time is less than 10s, the cold work hardening of the wire cannot be completely eliminated, the hardness of the material is higher, the plasticity is poorer, and the deformation resistance is large. When the temperature is higher than 60s, excessive coarsening of crystal grains of the wire can occur, meanwhile, the production efficiency of bright annealing can be influenced, and the production cost is increased. The optimal heat preservation time is 45-60 s.

In the art, a rolling mill comprises a roller, a frame, a roller spacing adjusting device, a roller temperature adjusting device, a transmission device, a lubricating system, a control system, a roller detaching device and the like. In the present application, a twin roll mill is utilized. Firstly, two plane rollers are installed on a rolling mill, the two plane rollers are arranged along the height direction, and the axes of the two plane rollers are parallel to each other. Flattening the GH2132 high-temperature alloy round wire subjected to bright annealing by using a plane roller, preparing the round wire into flat wire, and carrying out bright annealing treatment on the flat wire; then, replacing a lower plane roller with a first roller on a rolling mill, performing first-step cold rolling on the bright annealed flat wire, preparing the bright annealed flat wire into a special-shaped wire, and performing bright annealing treatment on the special-shaped wire; the first roller is replaced by a second roller, the bright annealed special-shaped wire is subjected to second-step cold rolling, the bright annealed special-shaped wire is prepared into an asymmetric cross-section special-shaped wire semi-finished product, and the asymmetric cross-section special-shaped wire semi-finished product is subjected to bright annealing treatment; and finally, carrying out size adjustment on the asymmetric section special-shaped wire semi-finished product on a cold drawing machine by utilizing a cold drawing die to obtain the asymmetric section special-shaped wire. According to the product requirement, the flattening, the first rolling, the second rolling and the cold drawing times can be selected, so that the final asymmetric section special-shaped wire has the advantages of high dimensional accuracy, good performance, difficult wire breakage and the like.

In summary, the application has the following beneficial effects:

1. because the GH2132 alloy asymmetric section special-shaped wire with the width smaller than 5mm and the thickness smaller than 1mm is prepared by adopting the method of cold rolling forming with the grooves and cold drawing composite forming, the problems of difficult cold rolling forming, poor dimensional accuracy and easy wire breakage are solved;

2. The method of the application not only realizes the forming of the asymmetric section special-shaped wire, but also realizes the control of the dimensional accuracy of the asymmetric section special-shaped wire, and can realize industrialized continuous production;

3. By using the preparation method of the application, the irregular wire with an asymmetric section has no defect in size, high size precision, 714MPa of tensile strength and 7.5 grade of grain size.

Drawings

FIG. 1 is a schematic illustration of the shape of an asymmetric cross-section profiled filament in accordance with the present application;

FIG. 2 is a flow chart of a process for preparing the asymmetric section special-shaped wire in the application;

FIG. 3 is a schematic representation of round wire flattening to produce flat wire in accordance with the present application;

FIG. 4 is a schematic diagram of a first cold rolling step for preparing a profiled wire in accordance with the present application;

FIG. 5 is a schematic diagram of the second cold rolling step for preparing the asymmetric section profile wire in the application;

FIG. 6 is a schematic cross-sectional view of a cold drawing die of the present application;

In the figure, 1, a first section; 2. a second cross section; 3. a plane roller; 4. round wires; 5. a first roller; 51. a first ring groove; 6. flat filaments; 7. a second roller; 71. a second ring groove; 8. profiled yarn; 9. cold drawing the mould; 10. an asymmetric section profile wire.

Detailed Description

The application is described in further detail below with reference to the drawings and examples.

Referring to fig. 1 and 2, in the present application, a double roll mill is used to produce and prepare a profiled wire with an asymmetric cross section. The method comprises the following steps of material selection, bright annealing, flattening, bright annealing, first cold rolling, bright annealing, second cold rolling, bright annealing, cold drawing and bright annealing, and finally preparing the asymmetric section special-shaped wire 10.

The asymmetric section special-shaped wire 10 is in a long strip shape, the section of the asymmetric section special-shaped wire 10 comprises a first section 1 and a second section 2, the first section 1 is rectangular, the length of a long side is C, the width of a short side is T1, and C is more than T1; the second section 2 is hexagonal, the length of the longest side is B, and the second side, the third side, the fourth side, the fifth side and the sixth side are clockwise in sequence; the second side of the second section 2 and the short side of the first section 1 are shared sides, the longest side of the second section 2 and the long side of the first section 1 are collinear, the second side and the sixth side are respectively perpendicular to the longest side, the fourth side is parallel to the longest side, and the distance between the fourth side and the longest side is T2, and T2 is more than T1; the included angle between the third side and the fourth side is 135 degrees, the included angle between the fifth side and the fourth side is 155 degrees, the length of the sixth side is A, and T2 is more than A and more than T1.

Referring to fig. 3, two plane rolls 3 are installed on a twin roll mill, the two plane rolls 3 are placed opposite to each other in a height direction, and axes of the two plane rolls 3 are parallel to each other. Flattening the round wire 4 by using two plane rollers 3 to prepare a flat wire 6, and bright annealing the special-shaped wire 8, wherein the height of the flat wire 6 is T2+0.02-0.1 mm. According to the specification of the asymmetric section special-shaped wire, flattening for 1-3 times can be carried out, the reduction deformation of each time is 30-60%, and bright annealing is needed after each time of flattening.

Referring to fig. 4, the planar roller 3 positioned below is replaced with a first roller 5, the flat wire 6 after the bright annealing is subjected to a first cold rolling step by the planar roller 3 and the first roller 5 to prepare a shaped wire 8, and the shaped wire 8 is subjected to the bright annealing. The first roller 5 is provided with a first annular groove 51, the bottom surface of the first annular groove 51 is an arc surface, the bulge of the arc surface is arranged towards the central axis of the first roller 5, the highest position of the bulge is the largest distance from the peripheral surface of the first roller 5, the distance from the largest distance to the peripheral surface of the first roller 5 is gradually reduced from the largest distance to the two sides, and the largest distance is arranged at the middle part of the axial direction of the first roller 5. The maximum distance of the protrusions is T2+0.01-0.08 mm, and the minimum distance of the protrusions is T1+0.03-0.1 mm. According to the specifications of the asymmetric section profiled wire 10, a plurality of first cold rolling steps can be performed, and bright annealing is required after each first cold rolling step.

Referring to fig. 5, the first roll 5 is replaced with a second roll 7, the profiled wire 8 after the bright annealing is subjected to a second cold rolling step by the plane roll 3 and the second roll 7 to prepare an asymmetric cross-section profiled wire semi-finished product, and the asymmetric cross-section profiled wire semi-finished product is subjected to the bright annealing. The maximum distance of the second roller 7 is T2+0.01-0.06 mm, the minimum distance of the second roller 7 is T1+0.01-0.06 mm, and the length is L+0.01-0.08 mm. According to the specifications of the asymmetric section profiled wire 10, a plurality of second cold rolling steps can be performed, and bright annealing is required after each second cold rolling step.

Referring to fig. 6, the asymmetric section profiled filament semi-finished product is finished by using a cold drawing die 9, and the size is reduced by 0.01-0.05 mm, so that the asymmetric section profiled filament 10 is prepared.

Round wire 4 prepared from GH2132 alloy is selected as a raw material, the cross section area of the round wire 4 is 1 to 1.5 times of the cross section area of the asymmetric cross section special-shaped wire 10, and the components and the contents of the GH2132 alloy are shown in table 1:

TABLE 1 GH2132 alloy composition and content Table (unit: wt%)

The round wire 4 used in the following examples and comparative examples was of the same gauge, and the maximum distance of the first roll 5 during cold rolling was T2+0.08mm, and the minimum distance was T1+0.1mm. The maximum distance of the second roller 7 is T2+0.06mm, the minimum distance is T1+0.06mm, and the length is L+0.06mm. Finally, cold drawing is carried out to prepare the asymmetric section special-shaped wire 10, so as to meet different use requirements. Table 2 shows the dimensions of the asymmetric cross-section profile wire 10 of different gauges, and the specific parameters in other manufacturing conditions are shown in table 3 below.

TABLE 2 size of asymmetric section abnormal filament (unit: mm)

Specification of specification	A(0，-0.07)	B	L±0.03	T1±0.01	T2±0.02
						-4	0.2	0.55/0.49	1.57	0.14	0.29
-5	0.25	0.66/0.56	2.06	0.19	0.36
						-6	0.3	0.78/0.69	2.41	0.22	0.41
-8	0.33	1.02/0.92	3.21	0.31	0.58

Table 3 condition parameters in examples and comparative examples

Category(s)

Example 1

Example 2

Example 3

Example 4

Example 5

Example 6

Example 7

Diameter of round wire

1 Time of

1.2 Times

1.5 Times

1.2 Times

Flattening pass

1 Time

2 Times

3 Times

2 Times

Deformation amount

60％

45％

30％

45％

Annealing temperature

1000℃

950℃

1100℃

1000℃

Annealing time

45s

60s

10s

45s

Specification of specification

-4

-5

-6

Category(s)

Example 8

Comparative example 1

Comparative example 2

Comparative example 3

Comparative example 4

Comparative example 5

Comparative example 6

Diameter of round wire

1.2 Times

0.9 Times of

1.6 Times

Flattening pass

2 Times

Deformation amount

45％

70％

20％

45％

20％

45％

70％

Annealing temperature

1000℃

920℃

1120℃

1000℃

Annealing time

45s

70s

8s

45s

Specification of specification

-8

-4

Performance test

1. Component and content detection

The GB/T222 is utilized to detect the chemical components and the content in the round wire 4, the specific detection results are shown in the following table,

TABLE 4 chemical composition of round wire (unit: wt%)

Composition of the components

C

Si

Mn

P

S

Cr

Ni

Cu

Content of

0.041

＜0.1

＜0.005

0.0013

14.47

26.27

＜0.005

Composition of the components

B

Co

Mo

V

Ti

Al

Fe

Content of

0.0057

＜0.1

1.28

0.25

2.3

0.24

Allowance of

2. Size detection

The size of the asymmetric section wire 10 prepared in the present application was detected by a metallographic observation method, the specific size is shown in table 5,

TABLE 5 size of asymmetric section wire (unit: mm)

3. Performance detection

The tensile strength and grain size of the asymmetric cross-section profiled filament 10 were measured using the GB/T228 tensile test and the GB/T6394 standard, and specific measurement results are shown in the following table.

TABLE 6 Performance detection of asymmetric section Profile wire

Category(s)	Tensile strength/MPa	Grain size/grade	Yield/%
				Example 1	615	6.0	60
Example 2	622	6.0	90
				Example 3	630	6.0	78
Example 4	714	7.5	85
				Example 5	602	6.0	92
Example 6	631	6.0	90
				Example 7	625	6.0	90
Example 8	619	6.0	90
				Comparative example 1	599	7.0	45
Comparative example 2	441	5.0	90
				Comparative example 3	456	6.0	88
Comparative example 4	418	5.0	85
				Comparative example 5	-	-	-
Comparative example 6	-	-	-

* In table 6, "-" represents undetected performance.

As can be seen by combining examples 1 to 5 and combining tables 5 and 6, under the process conditions that the cross section area of the round wire 4 is 1.2 times that of the asymmetric cross section special-shaped wire 10, the round wire is flattened for 2 times, the deformation amount is 45%, the annealing temperature is 950 ℃, and the heat preservation time is 60 seconds, the asymmetric cross section special-shaped wire 10 with the specification of-4 is prepared; high dimensional accuracy, no defect and high tensile strength up to 714MPa.

As can be seen from the combination of examples 2, 6, 7, 8 and the combination of table 5 and table 6, asymmetric section profile wires 10 of different specifications were prepared under the same process conditions. The size and the performance meet the requirements, and the yield reaches 90 percent.

When example 2 and comparative examples 1 to 2 are combined and tables 5 and 6 are combined, it can be seen that the asymmetric section profile wire 10 has a dimensional compounding requirement when the deformation is less than 30% or more than 60%. But the asymmetric section profile wire 10 has poor performance or yield.

It can be seen from the combination of example 2 and comparative examples 3-4 and the combination of tables 5 and 6 that the asymmetric section profile wire 10 has a size compounding requirement when the annealing temperature is 920 ℃, the holding time is 70s, or the annealing temperature is 1120 ℃ and the holding time is 8 s. But the asymmetric section profile wire 10 has a lower tensile strength and grain size grade.

It can be seen from the combination of examples 2 and comparative examples 5 to 6 and the combination of tables 5 and 6 that the round wire 4 has a defect in size when the cross-sectional area is smaller than 1 time of the asymmetric cross-sectional profile wire 10 or the cross-sectional area of the round wire 4 is larger than 1.5 times of the asymmetric cross-sectional profile wire 10.

The present embodiment is only for explanation of the present application and is not to be construed as limiting the present application, and modifications to the present embodiment, which may not creatively contribute to the present application as required by those skilled in the art after reading the present specification, are all protected by patent laws within the scope of claims of the present application.

Claims

1. A GH2132 alloy asymmetric cross-section profiled wire for a fastener, characterized in that: the section of the asymmetric section special-shaped wire (8) comprises a first section (1) and a second section (2); the first section (1) is rectangular, the length of the long side is C, the width of the short side is T1, and C is more than T1; the second section (2) is hexagonal, the length of the longest side is B, and the second side, the third side, the fourth side, the fifth side and the sixth side are clockwise in sequence; the second side of the second section (2) and the short side of the first section (1) are shared sides, the longest side of the second section (2) and the long side of the first section (1) are collinear, the second side and the sixth side are respectively perpendicular to the longest side, the fourth side and the longest side are parallel, and the distance between the fourth side and the longest side is T2, and T2 is more than T1; the included angle between the third side and the fourth side is beta, the included angle between the fifth side and the fourth side is alpha, the length of the sixth side is A, and T2 is more than A and more than T1; in addition, the total length of the asymmetric section special-shaped wire (8) is L=C+B;

Where α is 155 and β is 135.

2. A process for preparing the GH2132 alloy asymmetric-cross-section special-shaped wire for fasteners as claimed in claim 1, comprising the steps of selecting materials, bright annealing, flattening, bright annealing, cold rolling, bright annealing, cold drawing and bright annealing in sequence,

Selecting materials, namely taking round wires (4) made of GH2132 alloy as raw materials, wherein the cross section area of the round wires (4) is 1-1.5 times of that of the asymmetric cross section special-shaped wires (8);

Flattening, namely flattening the round wire (4) to obtain a flat wire (6), wherein the flattening is carried out for 1-3 times, and the reduction deformation of each time is 30-60%;

cold rolling: comprises a first cold rolling step and a second cold rolling step; firstly, cold rolling, namely preparing flat wires (6) into special-shaped wires (8) by using a plane roller (3) and a first roller (5); secondly, cold rolling, namely preparing the special-shaped wire (8) into a semi-finished product of the special-shaped wire with the asymmetric section by using a plane roller (3) and a second roller (7);

A cold drawing step, namely finishing the asymmetric section special-shaped wire semi-finished product by utilizing a cold drawing die (9) to obtain an asymmetric section special-shaped wire (10), wherein the size of the finished product is reduced by 0.01-0.05 mm;

the bright annealing is to heat to 950-1100 ℃ in a hydrogen annealing furnace, keep the temperature for 10-60 s and then air-cool;

the height of the flat wire in the flattening step is T2+0.02-0.1 mm.

3. The method for preparing the GH2132 alloy asymmetric-section special-shaped wire for the fastener, which is characterized by comprising the following steps of: and in the flattening step, the flat wire (6) obtained after each pass of flattening needs bright annealing treatment.

4. The method for preparing the GH2132 alloy asymmetric-section special-shaped wire for the fastener, which is characterized by comprising the following steps of: and in the flattening step, the flattening is carried out for 2 times, and the reduction deformation of each pass of flattening is 40-45%.

5. The method for preparing the GH2132 alloy asymmetric-section special-shaped wire for the fastener, which is characterized by comprising the following steps of: the first roller (5) is provided with a first annular groove (51) on the peripheral surface, the bottom surface of the first annular groove (51) is an arc surface, the distance between the arc surface and the axis of the first roller (5) is firstly reduced and then increased along the axial direction of the first roller (5), and the maximum distance between the arc surface and the first annular groove (51) is deviated from the axial middle of the first roller (5).

6. The method for preparing the GH2132 alloy asymmetric-section special-shaped wire for the fastener, which is characterized by comprising the following steps of: the maximum distance between the cambered surface and the peripheral surface of the first roller (5) is T2+0.01-0.08 mm, and the minimum distance is T1+0.03-0.1 mm.

7. The method for preparing the GH2132 alloy asymmetric-section special-shaped wire for the fastener, which is characterized by comprising the following steps of: the peripheral surface of the second roller (7) is provided with a second annular groove (71) for extrusion molding of a semi-finished product of the irregular wire with the asymmetric section.

8. The method for preparing the GH2132 alloy asymmetric-section special-shaped wire for the fastener, which is characterized by comprising the following steps of: the maximum distance between the second annular groove (71) and the peripheral surface of the second roller (7) is T2+0.01-0.06 mm, the minimum distance is T1+0.01-0.06 mm, and the length is L+0.01-0.08 mm.

9. The method for preparing the GH2132 alloy asymmetric-section special-shaped wire for the fastener, which is characterized by comprising the following steps of: the heating temperature of the bright annealing is 950-1000 ℃, and the heat preservation time is 45-60 s.