CN218441786U

CN218441786U - Different titanium pipe in excircle and rolling production line thereof

Info

Publication number: CN218441786U
Application number: CN202222661136.XU
Authority: CN
Inventors: 张根明
Original assignee: CHANGSHU SPECIAL STEEL TUBE CO LTD
Current assignee: CHANGSHU SPECIAL STEEL TUBE CO LTD
Priority date: 2022-10-10
Filing date: 2022-10-10
Publication date: 2023-02-03
Anticipated expiration: 2032-10-10

Abstract

The utility model discloses an external round internal hetero-titanium pipe and a rolling production line thereof, wherein the external round internal hetero-titanium pipe comprises a titanium pipe body, the outer surface of the titanium pipe body is round, and the inner surface of the titanium pipe body is provided with evenly distributed convex parts; the forming die comprises an assembly shell, a finishing roller set and a special-shaped inner die. The utility model discloses an inner wall and the outer wall rolling deformation simultaneously of titanium pipe in rolling in-process have successfully prepared the different special construction's in the excircle titanium pipe, just the utility model discloses the different titanium pipe mechanical properties is excellent in the excircle of preparation, product quality is high.

Description

Different titanium pipe in excircle and rolling production line thereof

Technical Field

The utility model relates to a titanium pipe production technical field especially relates to a different titanium pipe in excircle and rolling production line thereof.

Background

Titanium and titanium alloy tubes are used as important rare metal materials, have the characteristics of high strength, light weight, good corrosion resistance and the like, and are widely applied to aerospace, marine ships, nuclear power industry and medical industry. In particular, the marine ship industry needs to have corrosion resistance, pressure resistance, internal torque transmission, pressure detection and other performances.

Because the titanium tube has the characteristics of low heat conductivity coefficient, large width coefficient and poor plastic deformation at normal temperature, the titanium tube prepared by adopting the traditional two-roller rolling method has the problems of uneven section deformation of a rolled piece, deviation of the outer diameter and the inner hole size, easy formation of rib defects and the like. Chinese patent CN 105855307B discloses a drawing method for a special-shaped titanium tube, which comprises the steps of instantaneously heating a tube by using a coil type ultrasonic heater, then immediately drawing the tube at a constant speed by using a hydraulic speed-regulating drawing machine through a special-shaped outer mold, and drawing the tube once to obtain the titanium special-shaped tube with high quality of the inner and outer surfaces.

Nevertheless this application utility model people in the in-process of realizing utility model technical scheme in this application embodiment, discover that above-mentioned technique exists following technical problem at least:

with the development of science and technology, the application and the demand of the inner special-shaped titanium pipe in the fields of military industry, nuclear power stations and the like are more and more, but the drawing method can only draw the outer surface of the titanium pipe and cannot prepare the titanium pipe with higher requirement on the special shape of the inner surface.

SUMMERY OF THE UTILITY MODEL

The utility model discloses an different titanium pipe in excircle and rolling production line thereof can solve prior art and can not prepare the problem of different titanium pipe in the excircle.

In order to solve the technical problem, the utility model provides a different titanium pipe in excircle, including the titanium pipe body, the surface of titanium pipe body is circular, and its inner surface has evenly distributed's bellying.

In a preferred embodiment of the present invention, the number of the protrusions is four, six or eight.

In order to solve the technical problem, the utility model provides a rolling production line of the special titanium pipe in the excircle, which is characterized in that the rolling production line comprises a twin-screw variable frequency speed control device, a V-shaped riding wheel group, a superaudio heating unit, a forming die and a cylinder turning mechanism in sequence;

the forming die comprises an assembly shell, a finishing roller set and a special-shaped inner die; the finish roll group comprises a plurality of finish rolls, the finish roll groups are distributed in an annular equal interval mode, and inner hole areas are formed in the inner surfaces of the finish roll groups; the assembly shell is sleeved outside the finishing roller group and is in contact with the outer surface of the finishing roller group, and the assembly shell can reciprocate relative to the outer surface of the finishing roller group and change the aperture of the inner hole area; the special-shaped internal mold is arranged in the inner hole area of the finishing roller group, and a forming cavity of the special-shaped titanium pipe in the excircle is formed between the outer surface of the special-shaped internal mold and the inner surface of the finishing roller group.

In a preferred embodiment of the present invention, the assembly housing includes a housing body, a support seat and a wedge-shaped support block; the shell body is of a cylindrical structure, and connecting rod pin shafts are symmetrically arranged on the outer side of the shell body; the supporting seat is arranged on the inner surface of the shell body, the wedge-shaped supporting block is arranged on the supporting seat and is in contact with the outer surface of the finishing roller group, and the contact surface is an inclined surface; and each roll shaft of the finishing roll group rolls along the inclined plane of the corresponding wedge-shaped supporting block.

In a preferred embodiment of the present invention, the inclined plane has an inclined direction: and along the advancing direction of the titanium pipe, the vertical distance between the bottom surface of the wedge-shaped supporting block and the inclined surface is gradually increased.

In a preferred embodiment of the present invention, the inclined plane has an inclination angle of 4.5 to 6.0 °.

In a preferred embodiment of the present invention, the number of the finishing rolls in the finishing roll group is 5, and the number of the supporting seats and the wedge-shaped supporting blocks is matched with the number of the finishing rolls.

In a preferred embodiment of the present invention, the surface of the special-shaped inner mold has a plurality of protruding blocks distributed uniformly, and the number and size of the protruding blocks match with the area between two adjacent protruding portions on the titanium pipe body.

In a preferred embodiment of the present invention, the connecting rod pin of the housing body is further connected to a power unit, and the power unit drives the assembly housing to reciprocate in the horizontal direction.

In a preferred embodiment of the present invention, the power device drive includes a dc adjustable-speed motor, a first gear, a second gear and an eccentric shaft connecting rod, wherein, the power output shaft of the dc adjustable-speed motor is connected with the first gear, the first gear is connected with the second gear in a meshing manner, one end of the eccentric shaft connecting rod is fixed on the end face of the second gear, and the other end is connected with the connecting rod pin shaft on the housing body.

The utility model has the advantages that: the utility model relates to an different titanium pipe in excircle and rolling production line thereof has realized rolling deformation simultaneously at the inner wall and the outer wall of rolling in-process titanium pipe, has successfully prepared different special construction's in the excircle titanium pipe, just the utility model discloses different titanium pipe mechanical properties is excellent in the excircle of preparation, product quality.

Drawings

Fig. 1 is a schematic cross-sectional view of a preferred embodiment of a hetero-titanium tube with an outer circle and an inner circle according to the present invention;

fig. 2 is a schematic cross-sectional view of a preferred embodiment of a forming mold for a titanium pipe with an outer circle and an inner circle according to the present invention;

FIG. 3 is a schematic top view of a rolling line according to a preferred embodiment of the present invention;

FIG. 4 is a schematic cross-sectional structure of the inner die;

FIG. 5 is a side view of the wedge-shaped support block;

FIG. 6 is a schematic view of a connection structure of the power unit;

the parts in the drawings are numbered as follows:

10. a titanium tube body, 11, a bulge;

20. a double-screw variable frequency speed regulating device; 30. V-shaped riding wheel groups; 40. a superaudio heating unit;

50. the forming die comprises a forming die, 51 a mandrel, 52 a special-shaped inner die, 53 a shell body, 54 a supporting seat, 55 a wedge-shaped supporting block and 56 a finishing roll; 53-1, connecting rod pin; 52-1 raised blocks;

60. the power device comprises 61 a direct current speed regulating motor, 62 a first gear, 63 a second gear and 64 an eccentric shaft connecting rod.

Detailed Description

The following description of the preferred embodiments of the present invention will be provided with reference to the accompanying drawings, so that the advantages and features of the present invention can be easily understood by those skilled in the art, and the scope of the present invention can be clearly and clearly defined.

Referring to fig. 1-6, an embodiment of the present invention includes:

example 1

The utility model discloses an different titanium pipe in excircle, including titanium pipe body 10, the surface of titanium pipe body 10 is circular, and its inner surface has eight evenly distributed's bellying 11.

The utility model also discloses a rolling production line of different titanium pipes in excircle, along the rolling direction of titanium pipe inlet wire, rolling production line includes two lead screw variable frequency speed device 20, V type riding wheel group 30, superaudio frequency heating unit 40, forming die 50 and turns over jar mechanism (not shown) in proper order, wherein, forming die 50 passes through power device 60 drive.

The forming die 50 comprises an assembly shell, a finishing roller set, a mandrel 51 and a special-shaped inner die 52. Wherein the assembly housing includes a housing body 53, a support seat 54, and a wedge-shaped support block 55. The shell body 53 is of a cylindrical structure, and connecting rod pin shafts 53-1 which are symmetrically arranged are arranged on the outer side of the shell body; the support seat 54 is installed on the inner surface of the housing body 53, the wedge-shaped support block 55 is installed on the support seat 54, the surface of the wedge-shaped support block 55 is an inclined plane a, and the inclination direction is: along the advancing direction of the titanium pipe, the vertical distance between the bottom surface of the wedge-shaped supporting block 55 and the inclined surface A is gradually increased; the inclination angle is 4.5-6.0 degrees. The wedge-shaped supporting block 55 is made of quenched and tempered bearing steel, the hardness HRC of the bearing steel is 53-55 degrees, and the roughness Ra of the bearing steel is 0.4-0.6.

The finishing roll group comprises 5 finishing rolls 56. The 5 finishing rolls 56 are uniformly distributed in a ring shape, and the inner surface of the finishing rolls forms an inner hole area. The number of the support seats 54 and the wedge-shaped support blocks 55 and the positions thereof distributed in the housing body 53 are matched with 5 finishing rolls 56. Each finishing roller 56 in the finishing roller group is in contact with the inclined surface of the corresponding wedge-shaped supporting block 55, the assembly housing can drive the wedge-shaped supporting block 55 to move relative to the finishing roller group, and as the surface of the wedge-shaped supporting block 55 is an inclined surface, when the assembly housing drives the wedge-shaped supporting block 55 to move along the wire inlet direction of the titanium pipe, the aperture of the inner ring formed by the 5 finishing rollers 56 is reduced from large to small.

The mandrel 51 penetrates through the center of the assembly outer shell and also penetrates through the inner hole area of the finishing roller group, and the special-shaped inner die 52 is installed on the mandrel 51 in a threaded mode and is located in the inner hole area. And a forming cavity of the external and internal iso-titanium pipe is formed between the outer surface of the special-shaped internal mold 52 and the inner surface of the inner ring formed by the finishing roller group. The process that the bore diameter of the inner ring formed by the 5 finishing rolls 56 is reduced from large to small is also the process that the outer diameter of the titanium pipe is gradually reduced to finish rolling.

The movement of the assembly housing is driven by a power means 60. Specifically, the power device 60 is composed of a direct current speed regulation motor 61, a first gear 62, a second gear 63 and an eccentric shaft connecting rod 64, wherein a power output shaft of the direct current speed regulation motor 61 is connected with the first gear 62, the first gear 62 is meshed with the second gear 63, one end of the eccentric shaft connecting rod 64 is fixed on an end face of the second gear 63, and the other end of the eccentric shaft connecting rod is connected with a connecting rod pin shaft 53-1 on the housing body 63.

The surface of the special-shaped inner die 52 is provided with a plurality of uniformly distributed convex blocks 52-1, and the number and the size of the convex blocks 52-1 are matched with the area between two adjacent convex parts 11 on the titanium pipe body 10. Specifically, the material of the special-shaped inner die 52 is 12GrMoV, the hardness HRC is less than or equal to 55 degrees, the surface is polished, and the roughness Ra0.63 is obtained. The special-shaped internal mold 52 is formed by laser linear cutting, the two sides of each protruding block 52-1 are provided with wedge angles of 5-7 degrees, the top surface of each protruding block 52-1 is provided with wedge angles of 3-4 degrees, and the introduction of a titanium pipe is facilitated through the design of the wedge angles. The transverse and longitudinal margins of the special-shaped inner die 52 are 0.1-0.12 mm, which is beneficial to preventing the cooling rebound of the hot-rolled titanium tube.

The cylinder turning mechanism is used for turning over the cylinder to discharge the rolled excircle and inside different titanium pipe and then carrying out the next heating rolling cycle.

The preparation method of the special-shaped titanium tube specifically comprises the following steps:

(1) Pretreatment of a titanium tube: carrying out size inspection and surface quality inspection on the raw material tube blank, carrying out chemical element analysis on the raw material tube blank by using a direct-reading spectrometer T50B, and selecting the tube blank with the element content meeting the requirements as a titanium tube blank; then sequentially carrying out non-oxidation annealing, two-roller rolling, degreasing and pickling and vacuum annealing treatment on the selected titanium pipe blank to obtain a pretreated titanium pipe;

specifically, the element content of the titanium pipe blank is required to be as follows: mo is more than or equal to 0.2 percent and less than or equal to 0.4 percent, ni is more than or equal to 0.6 percent and less than or equal to 0.9 percent, fe is less than or equal to 0.30 percent, C is less than or equal to 0.08 percent, N is less than or equal to 0.03 percent, H is less than or equal to 0.015 percent, O is less than or equal to 0.25 percent, and the balance is Ti.

The process conditions of the non-oxidation annealing are as follows: heating the titanium tube blank to 650 ℃ in an oxygen-free annealing furnace, controlling the heating time to be more than 2h, then preserving the heat for more than 3h, finally cooling to 250 ℃ along with the furnace without oxidation, discharging and air cooling.

The two-roller rolling process conditions are as follows: and (3) rolling by using a phi 114 two-roller rolling mill, adding a lubricant for lubrication and cooling in the rolling process, and ensuring that the thickness ratio between the maximum wall thickness point and the minimum wall thickness point of the titanium tube rolled by the two rollers is less than or equal to 1.5%. The inner and outer surfaces of the obtained titanium tube blank are clean through two-roller rolling, the uniformity of the wall thickness is improved, the defects of folding, sparrow skin, sinking and the like which are visible are avoided, and an important foundation is laid for the subsequent rolling forming of the special titanium tube with the outer circle and the inner circle.

The vacuum annealing is divided into two stages, and the specific process conditions are as follows:

in the first stage, the titanium tube rolled by the two rollers is heated to 400 ℃ in an annealing furnace, the heating time is controlled to be 1h, and the heat is preserved for 1h at 400 ℃;

and in the second stage, continuously heating to 650 ℃ from 400 ℃, keeping the heating time at 2h, keeping the temperature at 650 ℃ for 3h, then cooling to 400 ℃ along with the furnace, wherein the cooling time is more than or equal to 1.5h, finally discharging from the furnace, air cooling to room temperature, and sampling to detect the post-fracture elongation of the titanium tube which is more than or equal to 30%.

(2) And (3) rolling operation: and a lubricant is coated on the surface of the pretreated titanium pipe, and the rolling operation is carried out by adopting the rolling production line after drying, so that the rolling defect caused by poor plastic deformation of the titanium pipe at normal temperature can be overcome, and on the other hand, the effective preparation of the special titanium pipe in the excircle is realized by a combined rolling mode of isothermal heating and roller group finish rolling, the production period is shortened, and the production benefit is improved.

In the rolling production line, the double-screw rod variable-frequency speed regulating device 20 is used for conveying the pretreated titanium pipe, and the feeding linear speed of the pretreated titanium pipe is regulated to be 0.58-0.60 m/min through the double-screw rod variable-frequency speed regulating device 20.

The heating power of the ultrasonic frequency heating unit 40 is 120kW, the frequency is 26-30 kHz, and a coil type copper pipe is adopted for induction heating, wherein the copper pipe is generally a thin-walled copper pipe with the diameter of 12-14 mm. The thin-wall copper tube is wound into a coil with the space of 10-12 mm and the width of 130-140 mm, and the inner diameter of the coil is ensured to be 30-40 mm larger than the outer diameter of the titanium tube to be heated, so that the titanium tube can smoothly pass through the coil, and the transmission of induction power and the protection of the titanium tube are facilitated.

Under the feeding linear speed of 0.58-0.60 m/min, the heating power and frequency of the ultrasonic frequency heating unit 40 are adjusted, so that the temperature of the pretreated titanium pipe with the length of 0.58-0.60 m is increased from room temperature to 520 ℃ within 1min, thereby ensuring the initial temperature before rolling, and meanwhile, the distance between the pipe head of the pretreated titanium pipe heated to 520 ℃ and the inlet of the forming die 50 is controlled to be 30-40 mm, thereby being beneficial to ensuring the running safety of equipment and improving the rolling quality.

The lubricant comprises the following components in percentage by mass:

6% of graphite powder, 40-42% of lime, 10-12% of chlorinated paraffin, 8-9% of resin and 36-38% of soap water. Fully and uniformly stirring by using a stirring machine, uniformly coating the inner wall and the outer wall of the pretreated titanium tube by using a special tool, then placing the titanium tube on drying equipment at the temperature of between 60 and 80 ℃, drying the titanium tube for 24 hours, and then feeding the titanium tube into an isothermal heating and roller set finish rolling combined system for rolling. The lubricant does not fall off at 530 ℃, has a certain heat insulation effect, can effectively prevent heat generated when the titanium pipe deforms from being transferred to the finishing roller 56 and the special-shaped internal mold 52, and prevents the finishing roller 56 and the special-shaped internal mold 52 from being worn due to high temperature. In addition, the lubricant also has an enough lubricating function, can fully ensure that the titanium pipe has enough transverse and longitudinal extensibility, and ensures sufficient deformation, satisfactory size and stability in the rolling process.

(3) And (3) post-rolling treatment: and (3) cleaning the rolled external and internal iso-titanium pipe in the step (2) to remove the lubricant on the surface, then carrying out vacuum annealing treatment, wherein the process conditions of the vacuum annealing are the same as those in the step (1), and finally detecting, straightening, cutting and packaging the annealed external and internal iso-titanium pipe.

The utility model discloses a different titanium pipe in the excircle, the tensile strength who tests the different titanium pipe in the excircle that prepares moreover is greater than or equal to 485MPa, and the elongation after breaking is greater than or equal to 20%, has excellent mechanical properties.

The above-mentioned only be the embodiment of the present invention, not consequently the restriction of the patent scope of the present invention, all utilize the equivalent structure or equivalent flow transform made of the content of the specification and the attached drawings, or directly or indirectly use in other relevant technical fields, all including in the same way the patent protection scope of the present invention.

Claims

1. The titanium pipe with the outer circle and the inner circle is characterized by comprising a titanium pipe body, wherein the outer surface of the titanium pipe body is circular, and the inner surface of the titanium pipe body is provided with uniformly distributed convex parts.

2. The tube according to claim 1, wherein the number of the convex portions is four, six or eight.

3. The rolling production line of the titanium pipe with the different shapes of the outer circle and the inner circle according to claim 1 or 2, characterized in that the rolling production line sequentially comprises a double-screw rod variable frequency speed regulation device, a V-shaped supporting roller set, a superaudio frequency heating unit, a forming die and a cylinder overturning mechanism;

the forming die comprises an assembly shell, a finishing roller set and a special-shaped inner die; the finish roll sets comprise a plurality of finish rolls, the finish roll sets are distributed in an annular shape at equal intervals, and inner hole areas are formed on the inner surfaces of the finish roll sets; the assembly shell is sleeved outside the finishing roller group and is in contact with the outer surface of the finishing roller group, and the assembly shell can reciprocate relative to the outer surface of the finishing roller group and change the aperture of the inner hole area; the special-shaped inner die is installed in the inner hole area of the finishing roller group, and a forming cavity of the special-shaped inner die in the excircle is formed between the outer surface of the special-shaped inner die and the inner surface of the finishing roller group.

4. The rolling production line of the titanium pipe with the inside and the outside as claimed in claim 3, wherein the assembly housing comprises a housing body, a supporting seat and a wedge-shaped supporting block; the shell body is of a cylindrical structure, and connecting rod pin shafts are symmetrically arranged on the outer side of the shell body; the supporting seat is installed on the inner surface of the shell body, the wedge-shaped supporting block is installed on the supporting seat and is in contact with the outer surface of the finishing roller set, and the contact surface is an inclined surface; and each roll shaft of the finishing roll group rolls along the inclined surface of the corresponding wedge-shaped supporting block.

5. The rolling production line of the titanium pipe with the different inner diameter and the outer diameter according to claim 4, wherein the inclined surface has an inclination direction of: along the advancing direction of the titanium pipe, the vertical distance between the bottom surface of the wedge-shaped supporting block and the inclined surface is gradually increased.

6. The rolling production line of the titanium pipe with the outer circle and the inner circle as claimed in claim 5, wherein the inclination angle of the inclined plane is 4.5-6.0 °.

7. The production line for rolling the tubes with the different titanium inside and outside the circle as claimed in claim 6, wherein the number of the finishing rolls in the finishing roll group is 5, the number of the supporting seats and the number of the wedge-shaped supporting blocks are matched with the number of the finishing rolls.

8. The rolling production line of the titanium pipe with the external and internal diameter as claimed in claim 7, wherein the surface of the special-shaped internal mold is provided with a plurality of protruding blocks which are uniformly distributed, and the number and the size of the protruding blocks are matched with the area between two adjacent protruding parts on the titanium pipe body.

9. The rolling production line of the titanium pipe with the different outer circle and the different inner circle according to claim 8, wherein a connecting rod pin shaft of the shell body is further connected with a power device, and the power device drives the assembly shell to reciprocate in the horizontal direction.

10. The rolling production line of the tubes with the special titanium outside and the special titanium inside the outer circle according to claim 9, wherein the driving device comprises a direct current speed regulating motor, a first gear, a second gear and an eccentric shaft connecting rod, wherein a power output shaft of the direct current speed regulating motor is connected with the first gear, the first gear is meshed with the second gear, one end of the eccentric shaft connecting rod is fixed on an end face of the second gear, and the other end of the eccentric shaft connecting rod is connected with a connecting rod pin shaft on the shell body.