CN114196803A - GH2132 alloy asymmetric-section profiled wire for fastener and preparation method thereof - Google Patents

Abstract

The application relates to the field of high-temperature alloy processing, and particularly discloses a GH2132 alloy asymmetric-section profiled wire for a fastener and a preparation method thereof. The section of the asymmetric-section profiled 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 cross-section profile wire prepared in the application is suitable for occasions except the symmetric cross-section profile wire, and the asymmetric cross-section profile wire has the advantages of high size precision, high tensile strength, high yield and the like.

Description

GH2132 alloy asymmetric-section profiled 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-section profiled wires for fasteners.

Background

A fastener, also known on the market as a standard, is a mechanical element that mechanically secures or bonds two or more elements together. It features various varieties and specifications, different functions and usages, and very high standardization, serialization and universalization degree.

The fastener is the most widely used mechanical basic member and has a large demand. The requirements on the performance, the shape and the size of the fastener in aerospace are higher. At present, GH2132 alloy round wires or hexagonal, trapezoidal, rectangular and other symmetrical section special-shaped wires are most applied, and can meet part of use requirements. However, the special-shaped wires used at some special positions or in special shapes, such as the special-shaped wires with the width less than 5mm, the thickness less than 1mm and the asymmetrical cross sections, cannot be produced by adopting the traditional process.

Disclosure of Invention

The application provides a GH2132 alloy asymmetrical section profiled wire for fasteners and a preparation method thereof, in order to provide the asymmetrical section profiled wire with high dimensional accuracy, high performance and low rejection rate.

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

a GH2132 alloy asymmetric section profile wire for fasteners, which comprises a first section and a second section in cross section; the first section 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 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 sequentially arranged; the second edge of the second section and the short edge of the first section are shared edges, the longest edge of the second section is collinear with the long edge of the first section, the second edge and the sixth edge are respectively perpendicular to the longest edge, the fourth edge is parallel to the longest edge, and the distance between the fourth edge and the longest edge is T2, T2> T1; the included angle between the third edge and the fourth edge is 135 degrees, the included angle between the fifth edge and the fourth edge is 155 degrees, the length of the sixth edge is A, and T2 is more than A and is more than T1; in addition, the total length of the asymmetric-section profiled wire is L ═ C + B.

Through adopting above-mentioned technical scheme, this application provides a width is less than 5mm, thickness is less than 1 mm's asymmetric cross section abnormal shape silk, is applicable to the application scenario beyond the regular abnormal shape silk. However, the shape of the asymmetric cross-section profiled wire is relatively complex and cannot be realized by using the traditional production and preparation method, or the asymmetric cross-section profiled wire produced and prepared has poor performance, low dimensional precision and low qualification rate, and the problem of wire breakage also exists.

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

a preparation method of GH2132 alloy asymmetric section profiled wire for fasteners comprises the steps of material selection, bright annealing, flattening, bright annealing, cold rolling, bright annealing, cold drawing and bright annealing in sequence, wherein round wire made of GH2132 alloy is used as a raw material, and the sectional area of the round wire is 1-1.5 times that of the asymmetric section profiled wire;

flattening, namely flattening the round wire to obtain a flat wire, wherein flattening can be performed by 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; the first step of cold rolling is to prepare the flat wire into the special-shaped wire 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 an asymmetric cross section by using a plane roller and a second roller; cold drawing, namely finishing the semi-finished product of the asymmetric section profiled wire by using a cold drawing die to obtain the asymmetric section profiled wire, wherein the size of the finished product is reduced by 0.01-0.05 mm;

and (3) heating the bright annealing in a hydrogen annealing furnace to 950-1100 ℃, preserving the heat for 10-60 s, and then air cooling.

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

By adopting the technical scheme, the GH2132 high-temperature alloy is Fe-25 Ni-15 Cr-based high-temperature alloy, and is comprehensively strengthened by adding molybdenum, titanium, aluminum, vanadium and trace boron. The high-strength high-toughness low-toughness high-toughness low-toughness high-toughness low-toughness high-toughness low-toughness high-toughness low-toughness high-toughness low-toughness high-toughness.

Round wires prepared from GH2132 high-temperature alloy are used as raw materials for preparing asymmetric-section profiled wires. Firstly, bright annealing is carried out on round wires, the round wires are heated to 950-1100 ℃ in a hydrogen annealing furnace and are kept warm for 10-60 s, then air cooling is carried out, the round wires are flattened by 1-3 passes, the round wires are prepared into flat wires, and bright annealing is carried out after flattening of each pass; then, carrying out two-step cold rolling, namely, carrying out first-step cold rolling, preparing the flat wire into special-shaped wire by using a first roller and a plane roller, and carrying out bright annealing on the special-shaped wire; 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 second roller and a plane roller, and performing bright annealing on the semi-finished product of the special-shaped wire with the asymmetric cross section; and finally, performing cold drawing operation, and under the action of drawing force, passing the semi-finished product of the asymmetric section profiled wire through a cold drawing die for finishing to obtain the asymmetric section profiled wire. After cold drawing treatment, the asymmetric section profiled wire is more precise. According to different specifications and precision requirements, different cold drawing dies can be replaced to obtain asymmetric section profiled wires with different sizes, and the using requirements of different occasions are met.

The bright annealing refers to annealing in a high-temperature reducing atmosphere, the asymmetric section profiled wire is not oxidized, and the surface is kept 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 profiled wire can be improved, the hardness is reduced, and the plasticity is improved, thereby being beneficial to later-stage cutting and cold deformation processing. The bright annealing is carried out before each step of operation, so that the extensibility of the asymmetric-section profiled wire can be improved, and the possibility of cracking of the asymmetric-section profiled wire is reduced or prevented, thereby ensuring the yield when the asymmetric-section profiled wire is prepared by using the round wire.

Preferably, in the flattening step, the reduction deformation of each flattening pass is preferably 40-45% after 2 flattening passes.

By adopting the technical scheme, the production efficiency and the yield are directly influenced by the rolling pass and the deformation, and the production time is increased and the production efficiency is reduced when the rolling pass and the deformation are increased by one pass and the reduction deformation is small. When the flattening is performed in 1 pass and the amount of deformation is large, the possibility of the asymmetric cross-section profiled wire cracking increases, and the yield of the asymmetric cross-section profiled wire decreases. Preferably, the rolling is carried out in 2 times, and the reduction deformation of each rolling 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 sectional area of the round wire is 1-1.5 times of that of the asymmetric section special-shaped wire. According to different use requirements or different specifications, round wires with different sizes are selected. When the sectional area of the round wire is less than 1 time of the sectional area of the asymmetric sectional profile wire, the shape of the asymmetric sectional profile wire is incomplete after flattening and cold rolling. When the sectional area of the round wire is 1.5 times larger than that of the asymmetric section special-shaped wire, a large amount of defects such as flash, burrs and the like can be generated after flattening and cold rolling, so that the accuracy of the asymmetric section special-shaped wire is low; a large amount of manpower and material resources can be wasted when the flash and the burr are removed, and the production cost is increased. Similarly, the above problem also occurs when the height of the flat filament exceeds or falls below the maximum distance T2+ 0.02-0.1 mm of the asymmetric cross-section profile filament size. Therefore, the dimensions of the round and flat filaments need to be strictly controlled.

Preferably, a first ring groove is formed in the circumferential surface of the first roller, the bottom surface of the first ring groove is an arc surface, the distance from the arc surface to the axis of the first roller is firstly reduced and then increased along the axial direction of the first roller, and the maximum distance from the arc surface to the first ring groove is arranged in the middle of the axial direction of the first roller.

Preferably, the maximum distance between the arc surface and the peripheral surface of the first roller is T2+ 0.01-0.08 mm, and the minimum distance is T1+ 0.03-0.1 mm.

Through adopting above-mentioned technical scheme, seted up first annular on first roll, first annular tank bottom surface is the cambered surface, and the arch of cambered surface sets up towards the central axis of first roll, and protruding highest position is the maximum distance to global of first roll, diminishes to both sides distance from the maximum distance gradually, and the axial middle part setting of the skew first roll of maximum distance. 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. The first roller and the plane roller are utilized to prepare the flat wire into the special-shaped wire, and the shape and the size of the special-shaped wire are consistent with those of the ring groove.

Preferably, the circumferential surface of the second roller is provided with a second ring groove for extruding and forming the semi-finished product of the special-shaped wire with the asymmetric cross section.

Preferably, the deepest dimension of the second roller in the second cold rolling step is the maximum distance T2+ 0.01-0.06 mm of the asymmetric section profiled wire dimension, the shallowest dimension is the shortest distance T1+ 0.01-0.06 mm of the asymmetric section profiled wire dimension, and the length is the asymmetric section profiled wire dimension L + 0.01-0.08 mm.

By adopting the technical scheme, the second step of 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 cross section is prepared. And a second ring groove is formed in the second roller, and the shape of the second ring groove is consistent with that of the asymmetric section profile wire. However, the deepest dimension of the second roller is the maximum distance T2+ 0.01-0.06 mm of the asymmetric section profiled wire, the shallowest dimension is the shortest distance T1+ 0.01-0.06 mm of the asymmetric section profiled wire, and the length is the asymmetric section profiled wire dimension 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 quantity in the wire is less, and the performance can not meet the use requirement. Too low a temperature may also lead to increased cracking in subsequent flattening, cold rolling and cold drawing. When the heating temperature is higher than 1100 ℃, crystal grains in the wire gradually grow along with the rise of the temperature, and finally the performance of the asymmetric section profiled wire is reduced and cannot meet the use requirement. The heat preservation time also affects the performance of the asymmetric section profiled wire, when the heat preservation time is less than 10s, the cold working hardening of the wire material can not be completely eliminated, the material hardness is higher, the plasticity is poorer, and the deformation resistance is large. When the time is more than 60s, the crystal grains of the wire material can be coarsened excessively, and 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 field, the 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 dismounting device and the like. In this application, a two-roll mill is utilized. First, two flat rolls are installed on a rolling mill, the two flat rolls are arranged in the height direction, and the axes of the two flat rolls are parallel to each other. Flattening the bright annealed GH2132 high-temperature alloy round wire by using a plane roller, preparing the round wire into a flat wire, and performing bright annealing treatment on the flat wire; then, replacing a lower plane roller with a first roller on a rolling mill, carrying out first-step cold rolling on the bright annealed flat wire, preparing the bright annealed flat wire into a special-shaped wire, and carrying out bright annealing treatment on the special-shaped wire; replacing the first roller with a second roller, performing second-step cold rolling on the bright annealed special-shaped wire, preparing the bright annealed special-shaped wire into a semi-finished product of the asymmetrical cross-section special-shaped wire, and performing bright annealing treatment on the semi-finished product of the asymmetrical cross-section special-shaped wire; and finally, adjusting the size of the semi-finished product of the asymmetric-section profiled wire on a cold drawing machine by using a cold drawing die to obtain the asymmetric-section profiled wire. According to the product requirements, the rolling, the first step rolling, the second step rolling and the cold drawing times can be selected, so that the final asymmetric-section special-shaped wire has the advantages of high dimensional precision, good performance, difficulty in wire breakage and the like.

In summary, the present application has the following beneficial effects:

1. the GH2132 alloy asymmetric section profiled wire with the width smaller than 5mm and the thickness smaller than 1mm is prepared by adopting a method of grooved cold rolling forming and cold drawing composite forming, so that the problems of difficult cold rolling forming and poor size precision are solved, and the problems of poor cold drawing filling type and easy wire breakage are solved;

2. the method not only realizes the molding of the asymmetric section profiled wire, but also realizes the control of the size precision of the asymmetric section profiled wire, and can realize the industrialized continuous production;

3. by using the preparation method, the size of the asymmetric section special-shaped wire is free from defects, the size precision is high, the tensile strength can reach 714MPa, and the grain size can reach 7.5 grade.

Drawings

FIG. 1 is a schematic view of an asymmetric cross-section profile wire shape in the present application;

FIG. 2 is a flow chart of a process for preparing an asymmetric cross-section profile wire according to the present application;

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

FIG. 4 is a schematic illustration of a first step of cold rolling to produce a profiled wire in the present application;

FIG. 5 is a schematic diagram of a second step of cold rolling to produce a profiled wire with an asymmetric cross section;

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

in the figure, 1, the first section; 2. a second cross-section; 3. a plane roller; 4. round wire; 5. a first roll; 51. a first ring groove; 6. flattening the filaments; 7. a second roll; 71. a second ring groove; 8. special-shaped silk; 9. cold drawing the die; 10. the asymmetric section special-shaped wire.

Detailed Description

The present application will be described in further detail with reference to the following drawings and examples.

Referring to fig. 1 and 2, in the present application, asymmetric cross-section profile wire is produced using a twin roll mill. 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 the asymmetric-section profiled wire 10 is prepared.

The asymmetric section profiled wire 10 is long-strip-shaped, the section of the asymmetric section profiled 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 a hexagon, 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 sequentially; 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 is collinear with the long side of the first section 1, 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, T2> T1; the included angle between the third edge and the fourth edge is 135 degrees, the included angle between the fifth edge and the fourth edge is 155 degrees, the length of the sixth edge is A, and T2 is more than A and is more than T1.

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

Referring to fig. 4, the lower flat roll 3 is replaced with a first roll 5, the flat wire 6 after the bright annealing is subjected to a first cold rolling step by the flat roll 3 and the first roll 5 to prepare a special-shaped wire 8, and the special-shaped wire 8 is subjected to the bright annealing. The first ring groove 51 is formed in the first roller 5, the bottom surface of the first ring groove 51 is an arc surface, the protrusion of the arc surface is arranged towards the central axis of the first roller 5, the highest position of the protrusion is the maximum distance to the circumferential surface of the first roller 5, the distance from the protrusion to the circumferential surface of the first roller 5 gradually decreases from the maximum distance to the two sides, and the maximum distance deviates from the axial middle 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 specification of the asymmetric section profile wire 10, the first-step cold rolling can be performed for a plurality of times, and bright annealing is required after each first-step cold rolling.

Referring to fig. 5, the first roller 5 is replaced by a second roller 7, the bright annealed profiled wire 8 is subjected to second-step cold rolling by the plane roller 3 and the second roller 7 to prepare an asymmetric-section profiled wire semi-finished product, and the asymmetric-section profiled wire semi-finished product is subjected to 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 specification of the asymmetric section profile wire 10, the second-step cold rolling can be performed for a plurality of times, and bright annealing is required after each second-step cold rolling.

Referring to fig. 6, the semi-finished asymmetric cross-section profiled wire product is finished by using a cold-drawing die 9, and the size is reduced by 0.01-0.05 mm to prepare an asymmetric cross-section profiled wire 10.

Selecting a round wire 4 prepared from GH2132 alloy as a raw material, wherein the sectional area of the round wire 4 is 1-1.5 times that of the asymmetric sectional profile wire 10, and the components and contents of the GH2132 alloy are shown in Table 1:

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

The round wire 4 used in the following examples and comparative examples has the same furnace number, and the maximum distance of the first roll 5 during cold rolling is T2+0.08mm and the minimum distance is T1+0.1 mm. The second roll 7 has a maximum distance of T2+0.06mm, a minimum distance of T1+0.06mm and a length of L +0.06 mm. Finally, the asymmetric section profiled wire 10 is prepared by cold drawing, and different use requirements are met. Table 2 shows the dimensions of the asymmetric cross-section profile wire 10 of different specifications, and the specific parameters under other preparation conditions are shown in table 3 below.

TABLE 2 size of asymmetric Cross-section Profile wire (unit: mm)

Specification of	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

Categories

Example 1

Example 2

Example 3

Example 4

Example 5

Example 6

Example 7

Diameter of round wire

1 times of

1.2 times of

1.5 times of

1.2 times of

1.2 times of

1.2 times of

1.2 times of

Flattening pass

1 time of

2 times (one time)

3 times of

2 times (one time)

2 times (one time)

2 times (one time)

2 times (one time)

Amount of deformation

60％

45％

30％

45％

45％

45％

45％

Annealing temperature

1000℃

1000℃

1000℃

950℃

1100℃

1000℃

1000℃

Annealing time

45s

45s

45s

60s

10s

45s

45s

Specification of

-4

-4

-4

-4

-4

-5

-6

Categories

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 of

1.2 times of

1.2 times of

1.2 times of

1.2 times of

0.9 times of

1.6 times of

Flattening pass

2 times (one time)

2 times (one time)

2 times (one time)

2 times (one time)

2 times (one time)

2 times (one time)

2 times (one time)

Amount of deformation

45％

70％

20％

45％

20％

45％

70％

Annealing temperature

1000℃

1000℃

1000℃

920℃

1120℃

1000℃

1000℃

Annealing time

45s

45s

45s

70s

8s

45s

45s

Specification of

-8

-4

-4

-4

-4

-4

-4

Performance test

Firstly, detecting components and content

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

TABLE 4 round silk chemical composition table (unit: wt%)

Composition (I)

C

Si

Mn

P

S

Cr

Ni

Cu

Content (wt.)

0.041

＜0.1

＜0.1

＜0.005

0.0013

14.47

26.27

＜0.005

Composition (I)

B

Co

Mo

V

Ti

Al

Fe

Content (wt.)

0.0057

＜0.1

1.28

0.25

2.3

0.24

Balance of

Second, size detection

The sizes of the asymmetric section profile wire 10 prepared in the application are detected by a metallographic observation method, and the specific sizes are shown in table 5,

TABLE 5 size of asymmetric Cross-section Profile wire (Unit: mm)

Third, performance detection

The tensile strength and the grain size of the irregular yarn 10 with the asymmetric cross section are detected by using a GB/T228 tensile test and a GB/T6394 standard, and the specific detection results are shown in the following table.

TABLE 6 Performance testing of profiled wires with asymmetric cross-sections

Categories	Tensile strength/MPa	Grain size/grade	Percent of 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.

Combining examples 1-5 and tables 5 and 6, it can be seen that the asymmetric section profiled wire 10 of-4 specification is prepared under the process conditions that the sectional area of the round wire 4 is 1.2 times of that of the asymmetric section profiled wire 10, the round wire is flattened by 2 passes, the deformation is 45%, the annealing temperature is 950 ℃, and the heat preservation time is 60 s; high size precision, no defect and high tensile strength up to 714 MPa.

Combining examples 2, 6, 7, 8 and combining tables 5 and 6, it can be seen that different specifications of asymmetric cross-section profile wires 10 were prepared under the same process conditions. The size and the performance meet the requirements, and the yield reaches 90 percent.

Combining example 2 with comparative examples 1-2 and combining tables 5 and 6, it can be seen that the dimensional composite requirement of the asymmetric-section profile wire 10 is satisfied when the deformation is less than 30% or more than 60%. However, the asymmetric-section profile wire 10 has poor performance or yield.

By combining example 2 with comparative examples 3 to 4 and combining table 5 with table 6, it can be seen that the asymmetric cross-section profile wire 10 has a composite dimension requirement when the annealing temperature is 920 ℃ and the holding time is 70s, or when the annealing temperature is 1120 ℃ and the holding time is 8 s. However, the asymmetric-section profile wire 10 has a low tensile strength and grain size rating.

When example 2 and comparative examples 5 to 6 are combined and table 5 and table 6 are combined, it can be seen that there is a size defect when the sectional area of the round wire 4 is less than 1 time of the asymmetric sectional profile wire 10 or the sectional area of the round wire 4 is more than 1.5 times of the asymmetric sectional profile wire 10.

The present embodiment is only for explaining the present application, and it is not limited to the present application, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present application.

Claims (10)

1. A GH2132 alloy asymmetric section profile wire for fasteners is 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 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 sequentially; the second edge of the second section (2) and the short edge of the first section (1) are shared edges, the longest edge of the second section (2) and the long edge of the first section (1) are collinear, the second edge and the sixth edge are respectively perpendicular to the longest edge, the fourth edge is parallel to the longest edge, and the distance between the fourth edge and the longest edge is T2, 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 is more than T1; in addition, the total length of the asymmetric-section profiled wire (8) is L = C + B;

where α is 155 ° and β is 135 °.

2. A method for preparing GH2132 alloy asymmetric-section profiled wire for fasteners as claimed in claim 1, characterized by comprising the steps of selecting material, bright annealing, flattening, bright annealing, cold rolling, bright annealing, cold drawing, bright annealing in this order,

selecting materials, namely adopting a round wire (4) made of GH2132 alloy as a raw material, wherein the sectional area of the round wire (4) is 1-1.5 times that of the asymmetric sectional profiled wire (8);

a flattening step, flattening the round wire (4) to obtain a flat wire (6), wherein flattening can be performed 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; in the first step, the flat wire (6) is prepared into the special-shaped wire (8) by using a plane roller (3) and a first roller (5) in a cold rolling way; secondly, cold rolling, namely preparing the special-shaped wire (8) into a semi-finished product of the special-shaped wire with an asymmetric section by using a plane roller (3) and a second roller (7);

cold drawing, namely finishing the semi-finished product of the asymmetric section profiled wire by using a cold drawing die (9) to obtain the asymmetric section profiled wire (10), wherein the size of the finished product is reduced by 0.01-0.05 mm;

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

3. The method for preparing the GH2132 alloy wire with the asymmetrical cross-section for the fastener according to claim 2, wherein the method comprises the following steps: 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 wire with the asymmetrical cross-section for the fastener according to claim 2, wherein the method comprises the following steps: and in the flattening step, flattening is carried out for 2 times, and the reduction deformation of flattening in each time is 40-45%.

5. The method for preparing the GH2132 alloy wire with the asymmetrical cross-section for the fastener according to claim 2, wherein the method comprises the following steps: the height of the flat wire (6) in the flattening step is T2+ 0.02-0.1 mm.

6. The method for preparing the GH2132 alloy wire with the asymmetrical cross-section for the fastener according to claim 2, wherein the method comprises the following steps: first annular (51) have been seted up on first roll (5) global, first annular (51) bottom surface is the cambered surface, and the cambered surface increases along first roll (5) axial earlier apart from the distance of first roll (5) axis, and the cambered surface is gone up apart from the axial middle part setting of first roll (5) of first annular (51) maximum distance deviation.

7. The method for preparing the GH2132 alloy wire with the asymmetrical cross-section for the fastener according to claim 6, wherein the method comprises the following steps: the maximum distance between the arc surface and the circumferential surface of the first roller (5) is T2+ 0.01-0.08 mm, and the minimum distance is T1+ 0.03-0.1 mm.

8. The method for preparing the GH2132 alloy wire with the asymmetrical cross-section for the fastener according to claim 2, wherein the method comprises the following steps: and a second ring groove (71) for extruding and forming a semi-finished product of the special-shaped wire with the asymmetric cross section is formed on the circumferential surface of the second roller (7).

9. The method for preparing the GH2132 alloy wire with the asymmetrical cross-section for the fastener according to claim 8, wherein the method comprises the following steps: the maximum distance between the second ring groove (71) and the circumferential 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.

10. The method for preparing the GH2132 alloy wire with the asymmetrical cross-section for the fastener according to claim 2, wherein the method comprises the following steps: the heating temperature of the bright annealing is 950-1000 ℃, and the heat preservation time is 45-60 s.

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