Large-specification titanium alloy roll-to-rod finishing method

Abstract

The invention discloses a large-size titanium alloy roll-to-rod finishing method, which relates to the field of coiled material finishing, and comprises an unwinding mechanism, a pre-straightening assembly, a cold drawing mechanism, a peeling and fine calibration assembly and a cutting assembly which are sequentially arranged along the drawing direction of a coiled material, the cold drawing machine is characterized in that the cold drawing mechanism comprises a supercharger, a cold drawing die, an angle adjusting assembly and a traction mechanism; the supercharger is installed at an inlet of the cold drawing die and used for extruding lubricating powder into a horn inlet of the die to form a lubricating film layer. An angle adjusting assembly is arranged at an outlet of the cold drawing die, and it is ensured that the wire is bent and straightened in the dragging process of the traction mechanism. According to the finishing method, in the cold drawing process of the coiled material, the titanium alloy wire rod obtains a better lubricating effect and accurate size control in the cold drawing process through the synergistic effect of the supercharger and the angle adjusting assembly, and the mechanical performance and the machining efficiency of the material are remarkably improved.

Description

Technical Field

[0001] The present invention relates to the field of coil finishing, and specifically to a finishing method for large-size titanium alloy coils into bars. Background Art

[0002] With the rapid development of the aerospace, medical, and high-end equipment manufacturing fields, the market demand for large-size titanium alloy bars with a diameter of more than Φ11.2mm is increasing day by day. At present, titanium alloy coils are mainly prepared by the large deformation continuous rolling process, which has the advantages of high efficiency, low cost, and quality consistency. However, due to the inherent characteristics of titanium alloy materials, such as a narrow hot plastic deformation temperature window (usually 800-950°C) and high deformation resistance (the tensile strength at room temperature can reach more than 900MPa), the design of the rolling pass system for large-size titanium alloy coils is complex, and it is difficult to adjust the specifications. In the prior art, the specifications of continuously rolled coils are mostly limited to wire rods with a diameter of Φ11.2mm and below, and the rolling forming process stability of coils with a diameter of more than Φ11.2mm is poor, and it is difficult to control the grain structure uniformity, which further increases the difficulty of subsequent finishing uncoiling (coil-to-bar processing).

[0003] In the finishing processing link, the traditional cold drawing process has the following technical bottlenecks:

[0004] 1. Insufficient lubrication effect: Conventional lubricant spraying or dipping methods are difficult to form a uniform and dense lubricating film layer at the entrance of the cold drawing die, resulting in a large frictional resistance (friction coefficient > 0.1) during the drawing process of titanium alloy wire rods, and scratches or microcracks are easily generated on the surface, and the dimensional tolerance control accuracy is low.

[0005] 2. Poor coordination between straightening and traction: Most of the existing pre-straightening equipment uses single-dimensional correction (such as only vertical or horizontal straightening), and it is impossible to eliminate the longitudinal bending and transverse warping of titanium alloy coils at the same time, resulting in insufficient pre-straightening degree (residual bending degree > 2mm / m) before the wire rod enters the cold drawing die. In addition, the traction mechanism uses a single-point drawing mode, which is easy to cause local stress concentration of the wire rod, and the bending deformation rate during the drawing process is as high as 5% - 8%.

[0006] 3. High process efficiency and scrap rate: The traditional peeling and precision straightening process requires multiple repeated processing, the surface oxide scale removal is not thorough (residual thickness > 10μm), and the straightening accuracy is low (straightness > 1mm / m), resulting in a finished product qualification rate of less than 85%, which is difficult to meet the strict requirements of the high-end field for the surface finish (Ra ≤ 0.8μm) and straightness (≤ 0.5mm / m) of titanium alloy bars.

[0007] In summary, in the finishing process of large-sized titanium alloy coils into bars in the prior art, there are core problems such as uneven lubrication, low straightening accuracy, and asynchronous traction, resulting in unstable mechanical properties of the finished products and low processing efficiency. There is an urgent need for a finishing method that integrates efficient lubrication, multi-dimensional straightening, and coordinated traction to break through the technical barriers for the industrial application of titanium alloy bars with a diameter of more than Φ11.2mm. Summary of the Invention

[0008] To achieve the above object, the present invention provides the following technical solution: A finishing method for large-sized titanium alloy coils into bars, including: an unwinding mechanism, a pre-straightening assembly, a cold drawing mechanism, a peeling and precision calibration assembly, and a cutting assembly arranged in sequence along the drawing direction of the coil material, characterized in that:

[0009] The pre-straightening assembly performs bending pre-straightening on the coil material conveyed by the unwinding mechanism; the cold drawing mechanism performs cold drawing on the pre-straightened coil material; the peeling and precision calibration assembly peels and precisely calibrates the cold-drawn coil material to ensure a smooth surface; the cutting assembly performs precise cutting according to the preset required length of the coil material;

[0010] Among them, the cold drawing mechanism includes a supercharger, a cold drawing die, an angle adjustment assembly, and a traction mechanism;

[0011] The supercharger is installed at the entrance of the cold drawing die and is used to squeeze lubricating powder into the horn-shaped entrance of the die to form a lubricating film layer;

[0012] An angle adjustment assembly is provided at the exit of the cold drawing die for adjusting the angle of the cold drawing die to ensure that the wire is bent and straightened during the pulling process of the traction mechanism.

[0013] Further, preferably, the cold drawing die includes a fixed locking outer sleeve, and the angle adjustment assembly is arranged inside the fixed locking outer sleeve, and the inner die is set through the angle adjustment assembly.

[0014] Further, preferably, the angle adjustment assembly includes a driving component and a clamping module; the driving component drives the clamping module, and the clamping module is connected to the inner die; the clamping module is used to adjust the angle of the inner die under the action of the driving component.

[0015] Further, preferably, the traction mechanism includes two sets of drawing and traction driving units, and the two sets of drawing and traction driving units are slidably arranged on a slide rail; a clamping unit is arranged inside the drawing and traction driving unit;

[0016] The wire is alternately clamped by the clamping unit respectively, and under the action of the drawing and traction driving unit, it alternately advances and retreats along the slide rail to perform a reciprocating motion, realizing the coordination of drawing and conveying.

[0017] Further, preferably, the unwinding mechanism includes a carrying wheel, multiple groups of conveying pressure wheels, and a hydraulic press; the carrying wheel is used to support large-sized coils, and the conveying pressure wheels ensure that the coils are smoothly fed into the pre-straightening assembly;

[0018] Through multiple groups of the conveying pressure wheels and the hydraulic press, the end of the coil is accurately straightened.

[0019] Further, preferably, the pre-straightening assembly includes vertical straightening and horizontal straightening;

[0020] The vertical straightening and horizontal straightening work together to ensure that the titanium alloy coil reaches the pre-straightened state before entering the cold drawing die.

[0021] Further, preferably, the peeling and precision alignment assembly includes a peeling machine, a vertical precision alignment wheel, and a horizontal precision alignment wheel;

[0022] The peeling machine removes the oxide skin, and the vertical precision alignment wheel and the horizontal precision alignment wheel perform precise straightening to ensure that the surface of the titanium alloy straight bar is smooth and the straightness meets the standard.

[0023] Further, preferably, the cutting assembly includes a measuring and cutting unit and a material trough;

[0024] The measuring and cutting unit accurately measures the length of the bar and completes the cutting operation; the material trough receives the cut bar.

[0025] Compared with the prior art, the present invention provides a finishing method for large-sized titanium alloy coils to bars, having the following beneficial effects:

[0026] 1. The unwinding mechanism is used to unwind and feed the wire, and the hydraulic press is used to spot-straighten the drawing end, effectively reducing the risk of bending deformation of the wire during cold drawing, facilitating the subsequent entry of the coil into the cold drawing die for cold drawing processing, and improving the processing accuracy of the wire;

[0027] 2. The vertical straightening and horizontal straightening of the pre-straightening assembly work together, effectively improving the straightness of the titanium alloy coil and enabling it to reach an ideal pre-straightened state before entering the cold drawing die, thereby improving the straightness and surface quality of the finished product.

[0028] 3. The lubricating powder is squeezed into the entrance of the die horn through a booster and forms a lubricating film layer in the sizing zone along with the titanium alloy wire, effectively reducing the frictional resistance during drawing, thereby improving the production efficiency and drawing quality. The precise adjustment of the angle adjustment mechanism ensures the bending and straightening of the wire during cold drawing, reduces the rectification work in subsequent processes, and reduces the scrap rate. Description of the Drawings

[0029] Figure 1 It is an overall schematic diagram of a finishing method for large-sized titanium alloy coils to bars;

[0030] Figure 2 Schematic diagram of a traction mechanism for large - size titanium alloy coils to bars

[0031] Figure 3 Schematic diagram of a cold drawing mechanism for large - size titanium alloy coils to bars

[0032] In the figure: 1. Unwinding mechanism; 11. Bearing wheel; 12. Transmission pressure wheel; 13. Hydraulic press; 2. Pre - straightening component; 21. Vertical straightening; 22. Horizontal straightening; 3. Cold drawing mechanism; 31. Booster; 32. Cold drawing die; 321. Fixed locking outer sleeve; 322. Inner die; 33. Angle adjustment component; 33. Angle adjustment component; 34. Traction mechanism; 341. Driving component; 343. Clamping unit; 4. Skin - peeling and precision - straightening component; 41. Skin - peeling machine; 42. Vertical precision - straightening wheel; 43. Horizontal precision - straightening wheel; 5. Cutting component; 51. Measuring and cutting unit; 52. Material trough; 6. Coil Specific implementation mode

[0033] Referring to Figures 1 to 3 , the present invention provides a technical solution: A finishing method for large - size titanium alloy coils to bars, including: An unwinding mechanism 1, a pre - straightening component 2, a cold drawing mechanism 3, a skin - peeling and precision - straightening component 4, and a cutting component 5 arranged in sequence along the drawing direction of the coil 6, characterized in that:

[0034] The pre - straightening component 2 performs bending pre - straightening on the coil 6 conveyed by the unwinding mechanism 1; the cold drawing mechanism 3 performs cold drawing on the pre - straightened coil; the skin - peeling and precision - straightening component 4 peels and precisely straightens the cold - drawn coil 6 to ensure a smooth surface; the cutting component 5 performs precise cutting according to the preset required length of the coil 6;

[0035] Among them, the cold drawing mechanism 3 includes a booster 31, a cold drawing die 32, an angle adjustment component 33, and a traction mechanism 34;

[0036] The booster 31 is installed at the entrance of the cold drawing die 32 and is used to squeeze lubricating powder into the trumpet - shaped entrance of the die to form a lubricating film layer;

[0037] An angle adjustment component 32 is arranged at the exit of the cold drawing die 32 and is used to adjust the angle of the cold drawing die 32 to ensure that the wire is bent and straightened during the pulling process of the traction mechanism 34.

[0038] Place the coil 6 on the unwinding mechanism 1, start the unwinding mechanism 1 to smoothly release the coil 6, and the pre-straightening component 2 performs preliminary bending correction on it to ensure that the material is straight. Subsequently, the coil 6 enters the cold drawing mechanism 3, and the supercharger 31 injects lubricating powder into the die inlet to form a lubricating film layer to reduce friction. The cold drawing die 32, under the precise control of the angle adjustment component 33, enables the wire to achieve ideal bending and straightening during the pulling of the traction mechanism 34, ensuring the accuracy and surface finish of the final product.

[0039] The peeling and precision calibration component 4 performs meticulous peeling and precision calibration on the cold-drawn coil 6, removes surface impurities, and improves the surface finish. Finally, the cutting component 5 performs precise cutting according to the preset length to ensure that each coil 6 meets the standard size, completing the entire finishing process.

[0040] As a preferred embodiment, the cold drawing die 32 includes a fixed locking outer sleeve 321, and the angle adjustment component 33 is arranged inside the fixed locking outer sleeve 321, and the inner die 322 is arranged through the angle adjustment component 33.

[0041] It should be noted that the wire 6 lubricated by the supercharger 31 slides smoothly inside the cold drawing die 32. Through the precise adjustment of the angle adjustment component 33, the inner die 322 ensures that the wire 6 remains stable during the cold drawing process, further improving the drawing accuracy.

[0042] As a preferred embodiment, the angle adjustment component 33 includes a driving component and a clamping module; the driving component drives the clamping module, and the clamping module is connected to the inner die 322; under the action of the driving component, the clamping module is used to adjust the angle of the inner die 322.

[0043] It should be noted that the driving component ensures the precise adjustment of the angle of the inner die 322 by precisely controlling the clamping module, enabling the wire 6 to achieve ideal bending and straightening during the drawing process.

[0044] As a preferred embodiment, the traction mechanism 34 includes two sets of drawing and traction driving units 341, and the two sets of drawing and traction driving units 341 are slidably arranged on the slide rail; a clamping unit 343 is arranged inside the drawing and traction driving unit 341;

[0045] The clamping unit 343 alternately clamps the wire respectively, and under the action of the drawing and traction driving unit 341, it moves forward and backward alternately along the slide rail, making a reciprocating motion, to achieve the coordination of drawing and conveying.

[0046] The alternating movement of the two sets of drawing and traction drive units 341 ensures uniform stress on the wire during the drawing process, avoiding the problems of twisting and deformation easily caused by traditional single-point traction, and significantly improving the straightness and overall quality of the wire. Through precise coordinated operation, the drawing process is more stable and efficient, and the accuracy and surface finish of the final finished wire are reliably guaranteed.

[0047] As a preferred embodiment, the unwinding mechanism 1 includes a carrying wheel 11, multiple sets of conveying pressure wheels 12, and a hydraulic press 13; the carrying wheel 11 is used to support the large-size coil 6, and the conveying pressure wheels 12 ensure that the coil 6 is smoothly fed into the pre-straightening assembly 2;

[0048] Through the multiple sets of the conveying pressure wheels 12 and the hydraulic press 13, the end of the coil 6 is accurately straightened.

[0049] It should be explained that the hydraulic press 13 ensures its smooth entry into the pre-straightening assembly 2 by spot-straightening the end of the coil 6, improves the precise adjustment of the coil 6 in the pre-straightening assembly 2, effectively eliminates the initial bending, and lays a solid foundation for the subsequent cold drawing process.

[0050] As a preferred embodiment, the pre-straightening assembly 2 includes a vertical straightening 21 and a horizontal straightening 22;

[0051] The vertical straightening 21 and the horizontal straightening 22 work together to ensure that the titanium alloy coil reaches the pre-straightened state before entering the cold drawing die.

[0052] The vertical straightening 21 eliminates the longitudinal bending of the coil 6 through vertical adjustment; the horizontal straightening 22 is responsible for horizontal correction to ensure that the coil 6 reaches the ideal straightness in both dimensions. The two work together to provide precise pre-straightening for the titanium alloy coil to enter the cold drawing die 32, ensuring the smooth progress of the subsequent drawing process and the high-quality output of the wire 6.

[0053] As a preferred embodiment, the peeling and precision straightening assembly 4 includes a peeling machine 41, a vertical precision straightening wheel 42, and a horizontal precision straightening wheel 43;

[0054] The peeling machine 41 removes the oxide skin, and the vertical precision straightening wheel 42 and the horizontal precision straightening wheel 43 perform precision straightening to ensure that the surface of the titanium alloy straight bar is smooth and the straightness meets the standard.

[0055] The peeling machine 41 performs centerless turning on the titanium alloy straight bar to completely remove the surface oxide skin and ensure the purity of the material. Subsequently, the vertical precision straightening wheel 42 and the horizontal precision straightening wheel 43 work together with multiple sets of vertical and horizontal mechanisms to perform precision straightening on the titanium alloy straight bar after removing the oxide layer and correct minor deviations.

[0056] As a preferred embodiment, the cutting assembly 5 includes a measurement and cutting unit 51 and a material trough 52;

[0057] The measuring and cutting unit 51 accurately measures the length of the bar and completes the cutting operation; the chute 52 receives the cut bar.

[0058] The measuring and cutting unit 51 adopts a synchronous walking 360° full-circle embracing cutting mechanism to synchronously measure the length of the titanium alloy straight bar moving in a straight line and perform sizing cutting to ensure cutting accuracy. The cut titanium alloy bars smoothly fall into the chute 52, facilitating subsequent sorting and packaging. The entire process has a high degree of automation, effectively improving production efficiency and the quality of finished products.

[0059] In summary, through the precise cooperation of each component, the titanium alloy wire is controllable throughout the process from raw material to finished product, ensuring that each step of the process is accurate and error-free, and finally achieving the output of high-precision and high-surface-finish wire to meet the needs of high-end manufacturing.

[0060] During specific implementation, the coil 6 is placed on the unwinding mechanism 1. Through the stable support of the unwinding mechanism 1, the coil 6 is smoothly unwound and enters the pre-straightening assembly 2. The vertical straightening 21 and the horizontal straightening 22 work together to eliminate longitudinal and lateral bends, ensuring that the titanium alloy coil reaches an ideal straightness, laying a foundation for the cold drawing process. Subsequently, the coil 6 enters the cold drawing die 32, undergoes cold drawing, peeling, and precision straightening, and finally is accurately cut by the measuring and cutting unit 51, and the chute 52 receives the finished product, realizing the automated and efficient production of titanium alloy coils with a diameter of more than Φ11.2mm into bars.

[0061] This technology fills the gap in the existing technology, ensuring that the straightness and dimensional accuracy of titanium alloy coils with a diameter of more than Φ11.2mm both reach high standards during continuous production, significantly improving product quality, and meeting the urgent needs of high-end manufacturing for high-precision titanium alloy bars.

[0062] The above is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, makes equivalent substitutions or changes, and should be covered by the protection scope of the present invention.

Claims

1. A finishing method for large-size titanium alloy rolled into a rod, comprising: An unwinding mechanism (1), a pre-straightening assembly (2), a cold drawing mechanism (3), a peeling and fine-calibration assembly (4) and a cutting assembly (5) are sequentially arranged along the drawing direction of the coil (6), and are characterized in that: The pre-straightening component (2) performs pre-straightening by bending the coil (6) conveyed by the unwinding mechanism (1); the cold drawing mechanism (3) performs cold drawing on the pre-straightened coil; the peeling and fine-calibration component (4) performs peeling and fine-calibration on the cold-drawn coil (6) to ensure a smooth surface; the cutting component (5) performs precise cutting according to a preset required length of the coil (6); Wherein, the cold drawing mechanism (3) comprises a supercharger (31), a cold drawing die (32), an angle adjustment component (33), and a traction mechanism (34); The supercharger (31) is installed at the inlet of the cold drawing die (32) and is used to squeeze the lubricating powder into the horn inlet of the die to form a lubricating film layer; An angle adjustment component (34) is provided at the outlet of the cold drawing die (32) for adjusting the angle of the cold drawing die (32) to ensure that the wire is bent and straightened during the pulling process of the traction mechanism (34).

2. A finishing method for large-size titanium alloy rolled into rods according to claim 1, characterized in that: The cold drawing die (32) comprises a fixed locking outer sleeve (321), the angle adjustment component (33) is arranged inside the fixed locking outer sleeve (321), and the inner die (322) is arranged through the angle adjustment component (33).

3. A finishing method for large-size titanium alloy rolled into rods according to claim 2, characterized in that: The angle adjustment component (33) comprises a driving component and a clamping module; the driving component drives the clamping module, and the clamping module is connected to the inner mold (322); The clamping module is used to adjust the angle of the inner mold (322) under the action of the driving assembly.

4. The finishing method of large-size titanium alloy rolled into rod according to claim 1, characterized in that: The traction mechanism (34) comprises two groups of pulling and traction drive units (341), and the two groups of pulling and traction drive units (341) are slidably arranged on a slide rail; a clamping unit (343) is arranged inside the pulling and traction drive unit (341); The wires are alternately clamped by the clamping units (343), and under the action of the drawing and traction driving unit (341), they are alternately advanced and retreated along the slide rail to perform reciprocating motion, thereby achieving coordination of drawing and conveying.

5. The finishing method of large-size titanium alloy rolled into rod according to claim 1, characterized in that: The unwinding mechanism (1) comprises a load-bearing wheel (11), a plurality of groups of conveying and pressing wheels (12) and a hydraulic press (13); the load-bearing wheel (11) is used to support a large-sized coil (6), and the conveying and pressing wheels (12) ensure that the coil (6) is smoothly conveyed into the pre-straightening assembly (2); The ends of the coiled material (6) are accurately pressed straight by means of a plurality of groups of the conveying pressing wheels (12) and the hydraulic press (13).

6. The finishing method of large-size titanium alloy rolled into rod according to claim 1, characterized in that: The pre-straightening assembly (2) comprises a vertical straightening assembly (21) and a horizontal straightening assembly (22); The vertical straightening (21) and the horizontal straightening (22) work together to ensure that the titanium alloy coil reaches a pre-straightening state before entering the cold drawing die.

7. The finishing method of large-size titanium alloy rolled into rod according to claim 1, characterized in that: The peeling precision calibration component (4) comprises a peeling machine (41), a vertical precision calibration wheel (42) and a horizontal precision calibration wheel (43); The peeling machine (41) removes the oxide scale, and the vertical precision calibrating wheel (42) and the flat precision calibrating wheel (43) perform precision straightening to ensure that the surface of the titanium alloy straight bar is smooth and the straightness meets the standard.

8. The finishing method of large-size titanium alloy rolled into rod according to claim 1, characterized in that: The cutting assembly (5) comprises a measuring and cutting unit (51) and a material trough (52); The measuring and cutting unit (51) accurately measures the length of the bar and completes the cutting operation; the material trough (52) receives the cut bar.

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