Pulse heat and cold dual-state forming processing method of titanium alloy TA15

Abstract

The present application belongs to the technical field of titanium alloy processing, and discloses a pulsating thermal and cold dual-state forming processing method for titanium alloy TA15, which comprises the following steps: after the titanium alloy TA15 wire is hot-extruded to Φ7.5-Φ8.5 mm, the wire is cold-extruded to Φ5.5-Φ6.5 mm; then the wire is sequentially subjected to heat treatment I and cold-extrusion II to be deformed to Φ3.5-Φ4.5 mm; then the wire is sequentially subjected to heat treatment II and cold-extrusion III to be deformed to Φ2.0-Φ2.8 mm; then the wire is sequentially subjected to heat treatment III and cold-extrusion IV to be deformed to Φ1.4-Φ1.8 mm; finally, the wire is subjected to hot-extrusion II to be deformed to Φ1.1-Φ1.3 mm to obtain the wire finished product. The present application adopts the cold and hot dual-state processing technology, effectively adjusts the organization morphology, and avoids the occurrence of the organization damage and the fracture phenomenon in the production process of the titanium alloy TA15 disc wire.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of titanium alloy processing, in particular to a pulsating hot and cold dual-state forming processing method for titanium alloy TA15. BACKGROUND

[0002] Titanium alloy is widely used in aerospace, national defense, medical implantation, 3D printing and other fields due to its excellent performance.

[0003] However, the existing technology mainly adopts cold processing when processing titanium alloy, and titanium alloy has high strength, high hardness, low thermal conductivity and other characteristics, which makes it difficult to process titanium alloy material, prone to cracking, low mechanical properties, poor surface quality, and high processing difficulty coefficient, which is not conducive to its application and development.

[0004] In order to solve the above technical problems, the skilled person in the art proposes to use high-temperature hot forming processing technology for processing, which although the titanium alloy product obtained by the processing method has good thermal plasticity, but the energy consumption cost is great, the specification size is difficult to guarantee, and the titanium alloy is easy to have high-temperature hydrogen absorption and cause hydrogen embrittlement phenomenon, which leads to the failure of the simple high-temperature hot forming process.

[0005] Therefore, the present application provides a pulsating hot and cold dual-state forming processing method for titanium alloy TA15. SUMMARY

[0006] In order to solve the above-mentioned deficiencies in the prior art, the present application provides a pulsating hot and cold dual-state forming processing method for titanium alloy TA15. The present application adopts a new generation of production technology and process, which is particularly suitable for the high-difficulty wire material production process of TA15 special titanium alloy, and specifically includes a combination of hot forming process, pulsating heat treatment process and cold forming process.

[0007] The pulsating hot and cold dual-state forming processing method for titanium alloy TA15 of the present application is realized by the following technical scheme:

[0008] A pulsating hot and cold dual-state forming processing method for titanium alloy TA15, comprising the following steps:

[0009] S1, hot extruding I of titanium alloy TA15 crude wire material to deform the titanium alloy TA15 crude wire material to Φ7.5mm~Φ8.5mm, and obtain wire material A;

[0010] The hot extrusion I is extruded after being heated to 700~800℃ by step-by-step heating, and then cooled to 100℃ after extrusion is completed;

[0011] S2, cold extrusion I is conducted on the wire A, so that the wire A is deformed to Φ5.5mm~Φ6.5mm, and a wire B is obtained;

[0012] S3, heat treatment I is conducted on the wire B at 880~920℃, and then cold extrusion II is conducted, so that the wire B is deformed to Φ3.5mm~Φ4.5mm, and a wire C is obtained;

[0013] S4, heat treatment II is conducted on the wire C at 780~820℃, and then cold extrusion III is conducted, so that the wire C is deformed to Φ2.0mm~Φ2.8mm, and a wire D is obtained;

[0014] S5, heat treatment III is conducted on the wire D at 700~740℃, and then cold extrusion IV is conducted, so that the wire D is deformed to Φ1.4mm~Φ1.8mm, and a wire E is obtained;

[0015] S6, heat extrusion II is conducted on the wire E, so that the wire E is deformed to Φ1.1mm~Φ1.3mm, and a wire product is obtained.

[0016] Further, the heat extrusion I is conducted by using a heat treatment device A, the heat treatment device A comprises heating modules A, B, C, D and an extrusion module A connected in series, and the heating temperatures of the heating modules A, B, C and D are 80~120℃, 280~320℃, 480~520℃ and 720~780℃ respectively;

[0017] The titanium alloy TA15 wire is gradually sent from the heating module A to the heating module D at a wire feeding rate of 1.5~2.5m / min for heat treatment, and then extruded to Φ7.5mm~Φ8.5mm by the extrusion module A.

[0018] Further, the heat extrusion II is conducted by using a heat treatment device B, the heat treatment device B comprises heating modules E, F, G, H and an extrusion module B connected in series, and the heating temperatures of the heating modules E, F, G and H are 80~120℃, 280~320℃, 480~520℃ and 720~780℃ respectively;

[0019] The titanium alloy TA15 wire is gradually sent from the heating module E to the heating module H at a wire feeding rate of 1.5~2.5m / min for heat treatment, and then extruded to Φ1.1mm~Φ1.3mm by the extrusion module B.

[0020] Further, the heat treatment I is conducted for 4~5h, and the heating rate is 1~200℃ / h.

[0021] Further, the heat deformation treatment III has a processing time of 3-4h and a heating rate of 1-200℃ / h.

[0022] Further, the heat deformation treatment IV has a processing time of 1.5-2.5h and a heating rate of 1-200℃ / h.

[0023] Further, the cold extrusion III is performed by a cold extrusion device C, wherein the cold extrusion device C comprises N extrusion modules connected in series, each of which is a pass; and N≥6.

[0024] The diameters of the wire outlets of the N extrusion modules gradually decrease along the wire feeding direction, and the diameter difference of the wire outlets of two adjacent extrusion modules is 0.1-0.5mm.

[0025] Further, the wire C is fed through the N extrusion modules at a wire feeding rate of 1.5-2.5m / min to perform the extrusion treatment.

[0026] Further, the cold extrusion III is performed by a cold extrusion device D, wherein the cold extrusion device D comprises M extrusion modules connected in series, each of which is a pass; and M≥3.

[0027] The diameters of the wire outlets of the M extrusion modules gradually decrease along the wire feeding direction, and the diameter difference of the wire outlets of two adjacent extrusion modules is 0.2-0.5mm.

[0028] Further, the wire D is fed through the M extrusion modules at a wire feeding rate of 2m / min to perform the extrusion treatment.

[0029] Compared with the prior art, the present application has the following beneficial effects:

[0030] The present application takes into account the organizational characteristics and material features of titanium alloy TA15, such as the tensile strength of titanium alloy TA15 being about 1000 MPa, large deformation resistance, and prone to cracks caused by organizational damage and other quality problems, so the present application adopts a pulsating hot and cold dual-state forming processing method, first generates thermal deformation of titanium alloy wire at high temperature to Φ7.5mm~Φ8.5mm to reduce the deformation resistance and facilitate processing operation of the titanium alloy wire; then, at room temperature, a cross extrusion device composed of multiple mutually perpendicular extrusion modules is used to deform the titanium alloy wire, so that the cold deformation of the titanium alloy wire is efficiently and stably realized through multiple passes of cross processing; then the wire after cold deformation processing is alternately subjected to multiple heat treatment and cold extrusion, so that the grain size and mechanical properties of the wire are optimized, the plastic deformation capacity is strengthened, and the cold extrusion after each heat treatment is used to improve the organizational morphology of the wire and optimize the elongation performance of the wire, thereby facilitating subsequent processing.

[0031] The present application sequentially performs the above steps, adopts a cold and hot dual-state processing technology, effectively adjusts the organizational morphology, avoids the occurrence of organizational damage and cracking during the production process of titanium alloy TA15 disc wire, and realizes high-quality products of titanium alloy under the condition of maximum cold forming and low-cost process; and the extrusion processing and drawing processing are both carried out at room temperature, without the need for high-temperature heating, thereby avoiding energy loss.

[0032] The present application sequentially performs the above steps, improves the production efficiency, realizes the high-quality product requirements of titanium for the aviation industry, and provides the automatic production level and capacity of special titanium alloy, promotes the application development of the downstream industry, reduces the process of hot wire drawing, and avoids the quality problems of dust pollution and environmental pollution.

[0033] The present application improves the production efficiency of TA15 titanium alloy through multiple cold and hot alternating processing methods, and can eliminate the quality problems such as cracks, surface scratches, and pits in the production of TA15 titanium alloy; further, it can reduce the occurrence of safety accidents caused by the rupture of TA15 titanium alloy during the production process, improve the processing safety, improve the yield of TA15 titanium alloy, and the size specification control of drawing cold forming is very accurate, the error can be controlled within 0.001, and the surface treatment amount is reduced. Moreover, the cold extrusion treatment of the present application is oil and solid lubrication, avoiding the traditional graphite powder lubrication, and avoiding dust pollution and environmental problems. BRIEF DESCRIPTION OF DRAWINGS

[0034] Figure 1 It is a flowchart of the processing technology of the present application;

[0035] Figure 2 Fig. 1 is a structural schematic diagram of a heat treatment device A of the present application;

[0036] Figure 3 Fig. 2 is a structural schematic diagram of a heat treatment device B of the present application;

[0037] Figure 4 Fig. 3 is a structural schematic diagram of a cold extrusion device A of the present application;

[0038] Figure 5 Fig. 4 is a structural schematic diagram of a cold extrusion device B of the present application;

[0039] Figure 6 Fig. 5 is a structural schematic diagram of a cold extrusion device C of the present application;

[0040] Figure 7 Fig. 6 is a structural schematic diagram of a cold extrusion device D of the present application;

[0041] Figure 8 Fig. 7 is an SEM image of a surface layer region of a wire obtained by a prior art processing method;

[0042] Figure 9 Fig. 8 is an SEM image of a transition region between a surface layer and a middle part of a wire obtained by a prior art processing method;

[0043] Figure 10 Fig. 9 is an SEM image of a middle part region of a wire obtained by a prior art processing method;

[0044] Figure 11 Fig. 10 is an SEM image of a surface layer region of a wire obtained by a processing method of an embodiment of the present application;

[0045] Figure 12 Fig. 11 is an SEM image of a transition region between a surface layer and a middle part of a wire obtained by a processing method of an embodiment of the present application;

[0046] Figure 13 Fig. 12 is an SEM image of a middle part region of a wire obtained by a processing method of an embodiment of the present application. DETAILED DESCRIPTION

[0047] The present application considers that the energy consumption of pure heat treatment is very high and the economy is extremely poor, and the pure cold treatment process cannot be completed, which will produce a series of quality problems such as fracture and surface defects that cannot be overcome. Therefore, the present application takes cold and hot dual-state cooperation to improve efficiency and reduce energy consumption on the basis of normal production. And the technical solutions in the embodiments of the present application will be clearly and completely described below in combination with the drawings in the embodiments of the present application.

[0048] Please refer to Figure 1The application provides a pulsating heat and cold dual-state forming processing method for a titanium alloy TA15, and comprises the following steps.

[0049] S1, hot extrusion I is performed on the titanium alloy TA15 rough wire material, so that the titanium alloy TA15 rough wire material is deformed to Φ7.5mm-Φ8.5mm, and wire material A is obtained;

[0050] It should be noted that the application does not limit the specific equipment used in the hot extrusion I, as long as the titanium alloy TA15 wire material can be heat deformed to obtain the wire material A with a diameter of Φ7.5mm-Φ8.5mm. Figure 2 The application adopts the heat treatment device A to perform the hot extrusion I, and the titanium alloy TA15 rough wire material is sequentially threaded through the heating module A, the heating module B, the heating module C, the heating module D and the extrusion module A of the heat treatment device A at a wire feeding rate of 1.5-2.5m / min, the titanium alloy TA15 rough wire material is sequentially heated to 80-120℃, 280-320℃, 480-520℃ and 720-780℃ by the heating module A, the heating module B, the heating module C and the heating module D, and then the soft wire material treated by the multiple heating modules is extruded by the extrusion module A, so that the wire material with a diameter of Φ7.5mm-Φ8.5mm is obtained, and then the wire material is gradually cooled to 100℃, that is, the wire material A is obtained. The lengths of the heating module A, the heating module B, the heating module C and the heating module D are all 450-550mm long.

[0051] In order to enable the wire material to be uniformly cooled, the cooling device A is preferably used for cooling treatment, please refer to Figure 2 The cooling device A comprises multiple cooling modules A connected in series, and the cooling module A comprises at least three modules, so as to ensure that the wire material is cooled from 720-780℃ to 480-520℃, then to 280-320℃, and finally to 80-120℃, so that the titanium alloy TA15 wire material is gradually heated and uniformly cooled, so that the internal structure of the titanium alloy TA15 wire material is stably heat deformed, and the titanium alloy TA15 wire material is deformed to obtain the wire material A with a diameter of Φ7.5mm-Φ8.5mm. The lengths of the cooling modules A are all 450-550mm long.

[0052] S2, cold extrusion I is performed on the wire material A, so that the wire material A is deformed to Φ5.5mm-Φ6.5mm, and wire material B is obtained;

[0053] The present application considers that although single hot forming processing is difficult, the processing efficiency is low and the surface quality of the titanium alloy TA15 material after processing is poor, the single cold forming technology is extremely difficult, and quality problems such as crack fracture are prone to occur, the present application preferably adopts cold and hot dual-state processing, that is, after hot extrusion I, cold extrusion I is carried out, so as to carry out cold deformation after hot deformation, so as to improve the organization form of the titanium alloy TA15, and optimize the elongation performance of the titanium alloy TA15 material, thereby facilitating subsequent multi-pass deformation processing. And the present application does not limit the specific equipment used for cold extrusion I, as long as the titanium alloy TA15 wire material can be cold deformed. Please refer to Figure 4 The present application preferably adopts cold extrusion device A for cold extrusion I processing, and the cold extrusion device A comprises X extrusion modules A connected in series, and the adjacent two extrusion modules A are arranged perpendicular to each other, each extrusion module A is a pass, and the wire material A is extruded in turn, so as to process the wire material A to wire material B with a diameter of Φ5.5mm~Φ6.5mm, thereby forming a multi-pass cross extrusion process; wherein X≥8; the diameters of the wire outlets of the X extrusion modules gradually decrease along the wire feeding direction, and the diameter difference of the wire outlets of the adjacent two extrusion modules is 0.1~0.5mm. The present application realizes the purpose of single production of large deformation (so that the titanium alloy TA15 wire material is deformed to Φ5.5mm~Φ6.5mm) through the small deformation one-time forming of the multi-pass vertical intersection in the cold extrusion device A, and does not damage the organization structure and does not affect the deep processing process.

[0054] S3, the wire material B is subjected to heat treatment I at 880~920℃, and then subjected to cold extrusion II, so that the wire material B is deformed to Φ3.5mm~Φ4.5mm, and the wire material C is obtained;

[0055] It should be noted that the present application considers that the material internal organization of the titanium alloy TA15 after the above-mentioned cold extrusion I multi-pass deformation presents a non-uniform phenomenon, such as a large deformation variable on the outside and a small deformation variable on the inside, at this time, if the multi-pass deformation is directly carried out, the material organization will be damaged, and quality problems such as crack fracture will occur, therefore, the present application carries out heat treatment I on the wire B obtained after the cold extrusion I, carries out thermal organization deformation, so as to realize the repair and homogenization of the grain organization in the wire B, thereby avoiding the material organization from being damaged, the occurrence of crack fracture and the like, and further facilitating the further deformation processing of the material. Moreover, the present application does not limit the specific equipment used in the heat treatment I, as long as the titanium alloy TA15 wire can be subjected to thermal organization deformation, and the repair and homogenization of the grain organization in the wire BB can be realized. Preferably, the temperature is 880-920℃, and the processing time is 4-5h, and in order to avoid the occurrence of the situation that the internal and external temperature difference is too large when the material is heated, and the organization stress is increased, the heating rate of the heat treatment I should be 1-200℃ / h. Moreover, the present application can be subjected to the heat treatment I through equipment such as vertical intensive thermal organization treatment furnace, so as to realize concentrated mass heat treatment, high processing efficiency, low energy consumption and good stress relief effect.

[0056] The present application can avoid the occurrence of the situation that the organization is damaged, crack fracture and the like in the process of the multi-pass deformation processing of the cold extrusion II, and can also ensure that the subsequent deformation processing can be normally carried out without producing quality problems such as fracture. Please refer to Figure 5 , and preferably, the cold extrusion II is carried out by using the cold extrusion device B, and the cold extrusion device B comprises Y cold extrusion modules B which are sequentially connected in series, and adjacent two cold extrusion modules B are arranged perpendicular to each other, and each cold extrusion module B serves as a pass; wherein Y≥8; the diameters of the wire outlets of the Y cold extrusion modules B gradually decrease along the wire feeding direction, and the diameter difference of the wire outlets of adjacent two cold extrusion modules B is 0.1-0.5mm. The multiple cold extrusion modules B in the cold extrusion device B, adjacent two cold extrusion modules B are arranged perpendicular to each other, and the diameters of the wire outlets of the cold extrusion modules B gradually decrease along the wire feeding direction, and the diameter difference of the wire outlets of adjacent two cold extrusion modules B is 0.1-0.5mm, and each cold extrusion module B serves as a pass, and the wire B after the heat treatment I is sequentially subjected to extrusion processing, so as to be processed into the wire C with a diameter of Φ3.5mm-Φ4.5mm. The present application realizes the purpose of single production of large deformation variable (making the titanium alloy TA15 wire deformation to Φ3.5mm-Φ4.5mm) through the small deformation one-time forming of the multiple-pass perpendicular intersection in the cold extrusion device B, and the organization structure is not damaged, and the deep processing process is not affected.

[0057] S4, heat treating the wire C at 780-820 DEG C. for heat treatment II, and then performing cold extrusion III to deform the wire C to Φ2.0mm-Φ2.8mm, to obtain wire D;

[0058] It should be noted that the present application considers the size change of titanium alloy TA15, and the heat treatment II is performed at 780-820 DEG C. for 3-4h. In order to avoid the case that the internal and external temperature difference is too large when the material is heated, and the tissue stress is increased, the heating rate of the heat treatment II should be 1-200 DEG C. / h.

[0059] In order to realize the maximum deformation of the material continuously for many times without breaking and other quality problems, please refer to Figure 6 The cold extrusion device C is used for cold extrusion III, and the cold extrusion device C comprises N cold extrusion modules C connected in series, each cold extrusion module C as a pass; wherein N≥6; the diameter of the wire outlet of the N cold extrusion modules C gradually decreases along the wire feeding direction, and the diameter difference of the wire outlet of the adjacent two cold extrusion modules C is 0.1-0.5mm, and the wire C after heat treatment II is fed through the multiple cold extrusion modules C at a feeding rate of 1.5-2.5m / min, and the wire C is extruded and treated, and then air-cooled to room temperature, to obtain the solid lubricated wire D. For example, when six cold extrusion modules C are used for six-pass extrusion treatment, and the specifications (unit: mm) of the cold extrusion modules C are φ4.00-φ3.50-φ3.00-φ2.80-φ2.70-φ2.60-φ2.50-φ2.40.

[0060] S5, heat treating the wire D at 700-740 DEG C. for heat treatment III, and then performing cold extrusion IV to deform the wire D to Φ1.4mm-Φ1.8mm, to obtain wire E;

[0061] It should be noted that the present application considers the size change of titanium alloy TA15, and the heat treatment III is performed at 700-740 DEG C. for 1.5-2.5h. In order to avoid the case that the internal and external temperature difference is too large when the material is heated, and the tissue stress is increased, the heating rate of the heat treatment III should be not higher than 200 DEG C. / h, i.e. 1-200 DEG C. / h.

[0062] In order to further realize the maximum deformation of the material continuously for many times without breaking and other quality problems, please refer to Figure 7, the cold extrusion IV is carried out by using a cold extrusion device D, the cold extrusion device D comprises M cold extrusion modules D connected in series, each cold extrusion module D is as a pass; wherein, M is greater than or equal to 3; the diameter of the wire outlet of the M cold extrusion modules D gradually decreases along the wire feeding direction, and the diameter difference of the wire outlet of two adjacent cold extrusion modules D is 0.2-0.5mm, and the wire D after the heat treatment II is fed through the multiple extrusion modules D at a feeding rate of 1.5-2.5m / min to carry out the extrusion treatment, and the wire D is air-cooled to room temperature after the extrusion treatment, so that the solid lubricated wire E is obtained. And preferably, the three-pass draft cold forming equipment is used for the cold extrusion IV, and the three-pass draft specifications are φ2.40-φ2.00-φ1.80-φ1.60 in turn.

[0063] S6, the wire E is subjected to heat extrusion II, so that the wire E is deformed to Φ1.1mm-Φ1.3mm, that is, the wire product is obtained;

[0064] It should be noted that, in order to further optimize the non-uniform organization of the titanium alloy TA15 material after the cold extrusion IV, the wire D obtained by the cold extrusion IV is also subjected to heat extrusion II, so as to repair and homogenize the grain organization in the wire D. The present application does not limit the specific equipment used for heat extrusion II, as long as the titanium alloy TA15 wire can be deformed by heat, and the wire product with a diameter of Φ1.1mm-Φ1.3mm can be obtained. Please refer to Figure 3 , preferably, in order to make the wire E uniformly heated and stably deformed by heat, the heat treatment device B is used for heat extrusion II, the wire E is fed through the heating module E, the heating module F, the heating module G, the heating module H and the extrusion module B of the heat treatment device B at a wire feeding rate of 1.5-2.5m / min, the wire E is sequentially heated by the heating module E, the heating module F, the heating module G and the heating module H to 80-120℃, 280-320℃, 480-520℃ and 720-780℃ in turn, and then the soft wire after being treated by the multiple heating modules is extruded by the extrusion module B, so that the wire with a diameter of Φ1.1mm-Φ1.3mm is obtained, and then it is gradually cooled to 100℃, that is, the wire product is obtained. And the length of the heating module E, the heating module F, the heating module G and the heating module H is 450-550mm long.

[0065] And in order to make the wire material uniform cooling, preferably using cooling device B cooling treatment, the cooling device B includes a plurality of levels of cooling module B (length of each level of cooling module B is 450~550mm long) in series, cooling module B at least includes three, to ensure that the wire material from 720~780℃ to 480~520℃, then cooled to 280~320℃, and finally cooled to 80~120℃, so that the wire material E material gradually heating and uniform cooling, so that the wire material E internal structure of the whole stable thermal deformation, to make the wire material E deformation to Φ1.1mm~Φ1.3mm, that is, the wire product.

[0066] Example 1

[0067] The embodiment provides a pulsating thermal cold double-state forming processing method of titanium alloy TA15, comprising the following steps:

[0068] S1, the titanium alloy TA15 rough wire material is subjected to hot extrusion I, so that the titanium alloy TA15 rough wire material is deformed to Φ8mm, and wire material A is obtained;

[0069] In the embodiment, the hot treatment device A is used for hot extrusion I, the titanium alloy TA15 rough wire material is sequentially threaded through the heating module A, the heating module B, the heating module C, the heating module D and the extrusion module A of the hot treatment device A at a wire feeding rate of 2m / min, the titanium alloy TA15 rough wire material is sequentially subjected to step-by-step heating of 100℃, 300℃, 500℃ and 750℃ by the heating module A, the heating module B, the heating module C and the heating module D, and then the soft wire material subjected to the multi-stage heating module is extruded by the extrusion module A, so that the wire material is extruded to Φ8mm, and then the cooling device A is used for cooling treatment of the wire material subjected to the hot treatment device A, please refer to Figure 2 The cooling device A includes three cooling modules A in series, so as to ensure that the wire material is cooled from 750℃ to 500℃, then cooled to 300℃, and finally cooled to 100℃, so that the titanium alloy TA15 wire material is gradually heated and uniformly cooled, so that the titanium alloy TA15 wire material is stably deformed in the whole internal structure, and the titanium alloy TA15 wire material is deformed to obtain the wire material A with a diameter of Φ8mm. And the lengths of the heating module A, the heating module B, the heating module C and the heating module D are all 500mm long, and the lengths of the three cooling modules A are all 500mm long.

[0070] S2, the wire material A is subjected to cold extrusion I, so that the wire material A is deformed to Φ6mm, and wire material B is obtained;

[0071] In the embodiment, the cold extrusion I is performed by using the cold extrusion device A, the cold extrusion device A comprises eight extrusion modules A connected in series, two adjacent extrusion modules A are arranged perpendicularly to each other, each extrusion module A is a pass, and eight passes of cross extrusion are formed; the diameters of wire outlet ports of the eight extrusion modules gradually decrease along a wire feeding direction, and the diameter difference of the wire outlet ports of two adjacent extrusion modules is 0.1-0.5 mm.

[0072] S3, the wire B is subjected to heat treatment I at 900 ℃, and then subjected to cold extrusion II, so that the wire B is deformed to Φ4 mm, and a wire C is obtained;

[0073] In the embodiment, the heat treatment I is performed for 4.5 h. The cold extrusion II is performed by using the cold extrusion device B, the cold extrusion device B comprises eight cold extrusion modules B connected in series, two adjacent cold extrusion modules B are arranged perpendicularly to each other, and each cold extrusion module B is a pass; the diameters of wire outlet ports of the eight cold extrusion modules B gradually decrease along a wire feeding direction, and the diameter difference of the wire outlet ports of two adjacent cold extrusion modules B is 0.1-0.5 mm.

[0074] S4, the wire C is subjected to heat treatment II at 800 ℃, and then subjected to cold extrusion III, so that the wire C is deformed to Φ2.4 mm, and a wire D is obtained;

[0075] In the embodiment, the cold extrusion III is performed by using the cold extrusion device C, the cold extrusion device C comprises six cold extrusion modules C connected in series, and each cold extrusion module C is a pass; the diameters of wire outlet ports of the six cold extrusion modules C gradually decrease along a wire feeding direction, the diameter difference of the wire outlet ports of two adjacent cold extrusion modules C is 0.1-0.5 mm, and the wire C subjected to the heat treatment II is extruded by being sequentially fed through the cold extrusion modules C at a feeding rate of 2 m / min.

[0076] S5, the wire D is subjected to heat treatment III at 720 ℃, and then subjected to cold extrusion IV, so that the wire D is deformed to Φ1.6 mm, and a wire E is obtained;

[0077] The processing time of the heat treatment III in the embodiment is 2h. The cold extrusion IV is performed by using the cold extrusion device D, which comprises three cold extrusion modules D connected in series, each of which is a pass. The diameters of the wire outlets of the three cold extrusion modules D gradually decrease along the wire feeding direction, and the diameter difference between the wire outlets of any two adjacent cold extrusion modules D is 0.2-0.5mm. The wire D after the heat treatment II is fed through the extrusion modules D at a feeding rate of 2m / min to perform the extrusion treatment, and then air-cooled to room temperature after the extrusion treatment to obtain the solid-lubricated wire E.

[0078] S6, the wire E is subjected to the heat extrusion II to deform the wire E to Φ1.2mm, i.e. to obtain the wire product;

[0079] In the embodiment, the heat extrusion II is performed by using the heat treatment device B. The titanium alloy TA15 crude wire is fed through the heating modules E, F, G, H and the extrusion module B of the heat treatment device B at a wire feeding rate of 2m / min. The titanium alloy TA15 crude wire is subjected to the step-by-step heating at 100℃, 300℃, 500℃ and 750℃ by the heating modules E, F, G and H in sequence, and then the soft wire after the treatment by the multiple heating modules is extruded by the extrusion module B to obtain the wire of Φ1.2mm. Then, the cooling device B is used to perform the cooling treatment. The cooling device B comprises three cooling modules B connected in series, each of which is 500mm long, so as to ensure that the wire is cooled from 750℃ to 500℃, then to 300℃ and finally to 100℃, i.e. to obtain the wire product. The lengths of the heating modules E, F, G and H are all 500mm long.

[0080] Embodiment 2

[0081] The embodiment provides a pulsating heat and cold dual-state forming processing method of the titanium alloy TA15, which is different from the embodiment 1 only in that:

[0082] In the embodiment, the wire feeding rate of each step is 1.5m / min.

[0083] In S1, the heat extrusion I is performed by using the heating modules A, B, C and D to heat the titanium alloy TA15 crude wire at 80℃, 280℃, 480℃ and 720℃ in sequence, and then the wire is cooled by the three cooling modules A of the cooling device A from 720℃ to 480℃, then to 280℃ and finally to 80℃ to obtain the wire A of Φ7.5mm.

[0084] In S2, the cold extrusion device A includes 10 extrusion modules A connected in series, and the wire A is deformed to Φ5.5 mm to obtain the wire B.

[0085] In S3, the treatment temperature of the heat treatment I is 880℃, and the treatment time is 4h; and the cold extrusion module B includes 10 cold extrusion modules B connected in series to deform the wire B to Φ3.5 mm to obtain the wire C.

[0086] In S4, the treatment temperature of the heat treatment II is 780℃, and the treatment time is 3h; and the cold extrusion device C includes 8 cold extrusion modules C connected in series to deform the wire C to Φ2.0 mm to obtain the wire D.

[0087] In S5, the treatment temperature of the heat treatment III is 700℃, and the treatment time is 1.5h; and the cold extrusion device D includes 5 cold extrusion modules D connected in series to deform the wire D to Φ1.4 mm to obtain the wire E.

[0088] In S6, the heat extrusion II sequentially passes through the heating module E, the heating module F, the heating module G and the heating module H to sequentially heat the wire E at 80℃, 280℃, 480℃ and 720℃, and then passes through three cooling modules B connected in series of the cooling device B to sequentially cool the wire E from 720℃ to 480℃, from 480℃ to 280℃ and from 280℃ to 80℃, and finally obtains the wire product of Φ1.1 mm.

[0089] Example 3

[0090] The embodiment provides a pulsating heat and cold dual-state forming processing method of a titanium alloy TA15, and is different from the embodiment 1 only in that:

[0091] In the embodiment, the wire feeding rate of each step is 2.5 m / min.

[0092] In S1, the heat extrusion I sequentially passes through the heating module A, the heating module B, the heating module C and the heating module D to sequentially heat the titanium alloy TA15 coarse wire at 120℃, 320℃, 520℃ and 780℃, and then passes through three cooling modules A connected in series of the cooling device A to sequentially cool the wire from 780℃ to 520℃, from 520℃ to 320℃ and from 320℃ to 120℃, and finally obtains the wire A of Φ8.5 mm.

[0093] In S2, the cold extrusion device A is used to deform the wire A to Φ6.5 mm to obtain the wire B.

[0094] In S3, the treatment temperature of the heat treatment I is 920℃, and the treatment time is 5h; and the cold extrusion module B is used to deform the wire B to Φ4.5 mm to obtain the wire C.

[0095] In S4, the processing temperature of heat treatment II is 820 DEG C, the processing time is 4h; and the wire material C is deformed to Φ2.8mm by using the cold extrusion device C, and the wire material D is obtained.

[0096] In S5, the processing temperature of heat treatment III is 740 DEG C, the processing time is 2.5h; and the wire material D is deformed to Φ1.8mm by using the cold extrusion device D, and the wire material E is obtained.

[0097] In S6, the wire material E is sequentially subjected to the step-by-step temperature rising of 120 DEG C, 320 DEG C, 520 DEG C and 780 DEG C by using the heating module E, the heating module F, the heating module G and the heating module H in sequence, and then is sequentially cooled from 780 DEG C to 520 DEG C, from 520 DEG C to 320 DEG C and from 320 DEG C to 120 DEG C by using the three cooling modules B connected in series of the cooling device A, and the wire material product with Φ1.1mm is obtained.

[0098] Test part

[0099] The titanium alloy TA15 coarse wire material (the components are Fe:≤0.10, C≤0.04, Al:6.0-7.0, V:1.0-2.5, Mo:0.7-2.0, Zr:1.7-2.5, O:≤0.05, N≤0.01, H:≤0.005, Si:≤0.05, single element:≤0.05, the total of other impurities:≤0.3, and the rest is Ti, wherein the total of the components of each element is 1) is taken as an example, the processing methods of the embodiment 1 of the application and the prior art processing method are respectively used for processing, and the wire materials obtained by processing are respectively subjected to SEM testing, and the test results are respectively shown in the following table. Figures 8-13

[0100] Among them, Figure 8 It is the SEM image of the surface layer region of the wire material obtained by the prior art processing method, Figure 9 It is the SEM image of the transition region between the surface layer and the middle part of the wire material obtained by the prior art processing method, Figure 10 It is the SEM image of the middle part region of the wire material obtained by the prior art processing method; and by Figures 8-10 It can be seen that after the processing according to the processing technology in the prior art, there are quality problems such as pores and fractures in the material.

[0101] Figure 11 It is the SEM image of the surface layer region of the wire material obtained by the processing method of the embodiment 1 of the application, Figure 12 It is the SEM image of the transition region between the surface layer and the middle part of the wire material obtained by the processing method of the embodiment 1 of the application, Figure 13 It is the SEM image of the middle part region of the wire material obtained by the processing method of the embodiment 1 of the application, and by Figures 11-13 ​It can be seen that the crystal structure of the material is perfect and uniformly distributed, and there is no quality problem such as pores or cracks, and the quality of the obtained material is good.

[0102] Obviously, the above-mentioned embodiments are only part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor belong to the scope of protection of the present application.

Claims

1. A pulsating thermal cold dual-state forming processing method of a titanium alloy TA15, characterized in that, The method comprises the following steps: S1, hot extruding I is performed on the titanium alloy TA15 crude wire material to deform the titanium alloy TA15 crude wire material to Φ7.5mm~Φ8.5mm, and wire material A is obtained; The hot extruding I is performed after the temperature is raised to 700~800℃ in a step-by-step manner, and then the temperature is cooled to 100℃ after the extruding is completed; S2, cold extruding I is performed on the wire material A to deform the wire material A to Φ5.5mm~Φ6.5mm, and wire material B is obtained; S3, the wire material B is subjected to heat treatment I at 880~920℃, and then cold extruding II is performed to deform the wire material B to Φ3.5mm~Φ4.5mm, and wire material C is obtained; S4, the wire material C is subjected to heat treatment II at 780~820℃, and then cold extruding III is performed to deform the wire material C to Φ2.0mm~Φ2.8mm, and wire material D is obtained; S5, the wire material D is subjected to heat treatment III at 700~740℃, and then cold extruding IV is performed to deform the wire material D to Φ1.4mm~Φ1.8mm, and wire material E is obtained; S6, hot extruding II is performed on the wire material E to deform the wire material E to Φ1.1mm~Φ1.3mm, and the wire material product is obtained.

2. The method of claim 1, wherein The hot extruding I is performed by using a heat treatment device A, the heat treatment device A comprises heating modules A, B, C, D and an extruding module A connected in sequence, and the heating temperatures of the heating modules A, B, C and D are 80~120℃, 280~320℃, 480~520℃ and 720~780℃ respectively; The titanium alloy TA15 crude wire material is gradually sent from the heating module A to the heating module D at a wire feeding rate of 1.5~2.5m / min for heat treatment, and then extruded to Φ7.5mm~Φ8.5mm by the extruding module A.

3. The method of claim 1 wherein the step of processing further comprises the step of: The hot extruding II is performed by using a heat treatment device B, the heat treatment device B comprises heating modules E, F, G, H and an extruding module B connected in sequence, and the heating temperatures of the heating modules E, F, G and H are 80~120℃, 280~320℃, 480~520℃ and 720~780℃ respectively; The titanium alloy TA15 crude wire material is gradually sent from the heating module E to the heating module H at a wire feeding rate of 1.5~2.5m / min for heat treatment, and then extruded to Φ1.1mm~Φ1.3mm by the extruding module B.

4. The method of claim 1 wherein the step of processing further comprises the step of: The treatment time of the heat treatment I is 4~5h, and the temperature rising rate is 1~200℃ / h.

5. The processing method as described in claim 1, characterized in that, The treatment time of the heat treatment II is 3~4h, and the temperature rising rate is 1~200℃ / h; The treatment time of the heat treatment III is 1.5~2.5h, and the temperature rising rate is 1~200℃ / h.

6. The processing method as described in claim 1, characterized in that, The cold extruding I is performed by using a cold extruding device A, and the cold extruding device A comprises X cold extruding modules A connected in sequence, and adjacent two cold extruding modules A are arranged perpendicularly to each other, and each cold extruding module A is a pass; wherein X≥8. The diameters of the wire outlet of the X cold extrusion modules A gradually decrease along the wire feeding direction, and the diameter difference of the wire outlet of two adjacent cold extrusion modules A is 0.1-0.5 mm.

7. The method of claim 1 wherein the step of processing further comprises the step of: The cold extrusion II is performed by using a cold extrusion device B, and the cold extrusion device B comprises Y cold extrusion modules B connected in series, two adjacent cold extrusion modules B are arranged perpendicularly to each other, and each cold extrusion module B is a pass; wherein Y≥8. ​ The diameters of the wire outlet of the Y cold extrusion modules B gradually decrease along the wire feeding direction, and the diameter difference of the wire outlet of two adjacent cold extrusion modules B is 0.1-0.5 mm.

8. The processing method as described in claim 1, characterized in that, The cold extrusion III is performed by using a cold extrusion device C, and the cold extrusion device C comprises N cold extrusion modules C connected in series, and each cold extrusion module C is a pass; wherein N≥6. The diameters of the wire outlet of the N cold extrusion modules C gradually decrease along the wire feeding direction, and the diameter difference of the wire outlet of two adjacent cold extrusion modules C is 0.1-0.5 mm.

9. The method of claim 1 wherein, The cold extrusion IV is performed by using a cold extrusion device D, and the cold extrusion device D comprises M cold extrusion modules D connected in series, and each cold extrusion module D is a pass; wherein M≥3. The diameters of the wire outlet of the M cold extrusion modules D gradually decrease along the wire feeding direction, and the diameter difference of the wire outlet of two adjacent cold extrusion modules D is 0.2-0.5 mm.

10. The method of claim 1 wherein, In S1-S6, the wire feeding is performed at a wire feeding rate of 1.5-2.5 m / min.

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