Titanium alloy plate extrusion forming device and extrusion forming method thereof

Abstract

The application discloses a titanium alloy plate extrusion forming device and an extrusion forming method thereof, and relates to the technical field of extrusion forming.The application comprises an extrusion die, a transition groove is arranged on the side of the extrusion die close to the extrusion cylinder of an extrusion device, the transition groove is arranged in a structure of a round earth, and is transitioned from a circular shape at the outer end to a rectangular shape at the inner end; and a stepped hole is arranged on the side of the extrusion die far from the extrusion cylinder of the extrusion device, the stepped hole is composed of a large rectangular hole at the outer end and a small rectangular hole at the inner end.The structure of the extrusion die is improved, the transition groove and the stepped hole are arranged, the extrusion die can greatly improve the extrusion processing efficiency of the titanium alloy plate, the microstructure requirement and the mechanical property of the plate can meet the requirements, and the problems that the existing extrusion forming die is not perfect, the extrusion processing period of the titanium alloy plate is long, and the microstructure requirement and the mechanical property of the plate are difficult to meet the requirements are solved.

Description

Technical Field

[0001] This invention belongs to the field of extrusion molding technology, and in particular relates to an extrusion molding apparatus for titanium alloy sheets and an extrusion molding method thereof. Background Technology

[0002] Titanium alloys refer to various alloys made of titanium and other metals. Titanium is an important structural metal developed in the 1950s. Titanium alloys are characterized by high strength, good corrosion resistance, and high heat resistance. In the 1950s and 60s, the main focus was on developing high-temperature titanium alloys for aero-engines and structural titanium alloys for airframes. Titanium alloy materials possess numerous advantages, including low density, light weight, high specific strength, good low-temperature and high-temperature performance, and excellent corrosion resistance. In recent years, the use of titanium alloy extruded profiles in the aerospace field has been increasing. Using titanium alloy extruded profiles as raw materials can achieve ideal microstructure and mechanical properties, improve material utilization, reduce manufacturing processes, and lower manufacturing costs. Titanium alloy extruded profiles have a very broad application prospect in the aerospace field.

[0003] Extrusion molding is mainly used to produce tubes, bars, profiles, and wire rods. Compared to other metal processing methods, its advantages are as follows: it produces a stronger triaxial compressive stress state diagram than rolling, allowing the metal to exert its maximum plasticity, thus enabling extrusion to process metals that cannot be processed by rolling or forging; it can produce products with complex cross-sections, which are difficult or impossible to handle by other processing methods, and are also costly; it has excellent flexibility, as various models and specifications of products can be produced on the same equipment by changing the die, making it very suitable for small-batch, multi-variety, and multi-specification production environments; the products have precise dimensions and high surface quality, and due to the high surface quality and dimensional accuracy, most extruded products can be used directly without further processing; it is easy to automate and enclose production, greatly reducing reliance on personnel at the processing site, and eliminating the need for human intervention in special hazardous production environments.

[0004] This invention utilizes the "extrusion forming technology" of the Zhongtai Qingduan multi-functional press for the key manufacturing of titanium alloy sheets through extrusion forming. Extrusion forming technology offers significant advantages in energy saving, material saving, shortening the manufacturing cycle, reducing costs, and improving product performance. However, existing titanium alloy sheet extrusion forming technologies still have the following drawbacks in practice:

[0005] 1. Existing extrusion dies are not perfect, resulting in long extrusion processing cycles for titanium alloy sheets, and making it difficult to meet the requirements for microstructure and mechanical properties of the sheets.

[0006] 2. Existing extrusion molding methods produce titanium alloy sheets with low yield rates, making it difficult to obtain homogeneous sheets, and the surface is prone to cracking.

[0007] Therefore, existing titanium alloy extrusion molding technology cannot meet the needs of actual use, so there is an urgent need for improved technology to solve the above problems. Summary of the Invention

[0008] The purpose of this invention is to provide a titanium alloy sheet extrusion molding apparatus and extrusion molding method. By improving the structure of the extrusion die, a transition groove and stepped holes are provided, which greatly improves the extrusion processing efficiency of titanium alloy sheets, and the microstructure and mechanical properties of the sheets can also meet the requirements. This solves the problem that existing extrusion molding dies are not perfect, resulting in long extrusion processing cycles for titanium alloy sheets and difficulty in meeting the microstructure and mechanical properties requirements of the sheets.

[0009] To solve the above-mentioned technical problems, the present invention is achieved through the following technical solution:

[0010] The present invention is a titanium alloy sheet extrusion molding device, including an extrusion die. A transition groove is provided on the side of the extrusion die near the extrusion cylinder of the extrusion equipment. The transition groove is configured as a round-and-square structure, transitioning from a circle at the outer end to a rectangle at the inner end. A stepped hole is provided on the side of the extrusion die away from the extrusion cylinder of the extrusion equipment. The stepped hole consists of a large rectangular hole at the outer end and a small rectangular hole at the inner end.

[0011] Furthermore, the ratio of the circular area to the rectangular area of ​​the transition groove is 12.

[0012] Furthermore, the rectangular transition groove is higher on the two long sides and lower on the two short sides, so that when the sheet is extruded, the two vertical sides are formed first, and the horizontal side in the middle is formed later.

[0013] Furthermore, the length ratio of the large rectangular hole to the small rectangular hole in the stepped hole is 1.

[0014] Furthermore, the extrusion die has four bolt holes evenly distributed around its circumference at one edge of the extrusion cylinder near the extrusion equipment; the extrusion die is fixed to the end of the extrusion cylinder through the four bolt holes.

[0015] This invention also provides a method for extruding titanium alloy sheets, comprising the following steps:

[0016] Step 1: Apply anti-oxidation coating to the extruded billet. Place the titanium alloy billet in the heating furnace for preheating at 150℃~180℃ and hold for 10 minutes. After exiting the furnace, spray the anti-oxidation coating evenly and then return it to the furnace at 180℃~200℃ and hold for 5 minutes.

[0017] Step 2: Heating the extruded billet. The coated titanium alloy billet is placed in an electric resistance furnace and heated to 930℃, and held at that temperature for 2.5 to 3 hours.

[0018] Step 3: Mold installation and preheating. Install the mold as required, and then preheat the extrusion cylinder and extrusion die to a temperature of 250℃~350℃.

[0019] Step 4: Lubrication and wrapping of the billet. The surface of the heated titanium alloy billet is lubricated with a lubricant, and then wrapped for heat preservation.

[0020] Step 5: Mold lubrication. Spray grease evenly onto the inner surface of the extrusion cylinder, and then evenly onto the inner surface of the transition groove and stepped hole of the extrusion die, with a spray thickness of 1mm.

[0021] Step Six: Billet Transfer. Quickly transfer the wrapped titanium alloy billet from the heating furnace to the extrusion equipment within 3 minutes.

[0022] Step 7: Extrusion. The extrusion equipment performs extrusion at the set extrusion speed of 10mm / s.

[0023] Step 8: Remove the titanium alloy sheet after the extrusion is complete.

[0024] The present invention has the following beneficial effects:

[0025] 1. This invention improves the structure of the extrusion die by incorporating a transition groove and stepped holes. This significantly enhances the extrusion efficiency of titanium alloy sheets while ensuring that the microstructure and mechanical properties of the sheets meet the required standards. During extrusion, the titanium alloy billet enters the transition groove, then the two vertical sections on either side of the rectangular exit are formed first, followed by the horizontal section in the middle. Finally, the billet is extruded out of the equipment through the stepped holes, completing the extrusion operation. The stepped holes also provide insulation during separation of the sheet from the extrusion die, preventing direct contact between the sheet and the external environment. This results in a better temperature transition, making the sheet easier to demold, improving production efficiency, ensuring dimensional accuracy, and reducing production costs.

[0026] 2. The titanium alloy sheet produced by the extrusion molding method of the present invention has a high pass rate, can obtain homogeneous sheet, and the sheet surface is not easy to crack. By preheating the extrusion cylinder and extrusion die, and by lubricating the die, the molding efficiency is accelerated and the internal stress condition is improved. Attached Figure Description

[0027] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 A three-dimensional schematic diagram of the overall structure of the extrusion die Figure 1 ;

[0029] Figure 2 A three-dimensional schematic diagram of the overall structure of the extrusion die Figure 2 ;

[0030] Figure 3 This is a cross-sectional view of the extrusion die structure.

[0031] The attached diagram lists the components represented by each number as follows:

[0032] 1. Extrusion die; 11. Transition groove; 12. Stepped hole; 13. Bolt hole. Detailed Implementation

[0033] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

[0034] Please see Figures 1 to 3 As shown, the present invention is a titanium alloy sheet extrusion molding device, including an extrusion die 1. A transition groove 11 is provided on one side of the extrusion die 1 near the extrusion cylinder of the extrusion equipment. The transition groove 11 is configured as a round-and-square structure, transitioning from a circle at the outer end to a rectangle at the inner end. The ratio of the circular area to the rectangular area of ​​the transition groove 11 is 12. The two long sides of the rectangle of the transition groove 11 are higher and the two short sides are lower, so that when the sheet is extruded, the two vertical sides are formed first, and the horizontal side in the middle is formed later.

[0035] Among them, such as Figures 2 to 3 As shown, a stepped hole 12 is provided on the side of the extrusion die 1 away from the extrusion cylinder of the extrusion equipment. The stepped hole 12 is composed of a large rectangular hole at the outer end and a small rectangular hole at the inner end. The length ratio of the large rectangular hole to the small rectangular hole of the stepped hole 12 is 1.

[0036] By improving the structure of the extrusion die 1, a transition groove 11 and a stepped hole 12 are provided, which greatly improves the extrusion processing efficiency of titanium alloy sheets. The microstructure and mechanical properties of the sheets can also meet the requirements. During extrusion, the titanium alloy billet enters the transition groove 11, and then the two vertical sections on both sides of the rectangular exit are formed first, followed by the horizontal section in the middle. Finally, it is extruded out of the equipment through the stepped hole 12, completing the extrusion operation. The stepped hole 12 also plays a certain role in heat preservation when the sheet separates from the extrusion die 1, avoiding direct contact between the sheet and the external environment. The temperature drop transition effect is better, the sheet is easier to demold, which can improve production efficiency, ensure the dimensional accuracy of the sheet, and reduce production costs.

[0037] Among them, such as Figure 1 , 3 As shown, the extrusion die 1 has four bolt holes 13 evenly distributed around its circumference at one edge of the extrusion cylinder near the extrusion equipment; the extrusion die 1 is fixed to the end of the extrusion cylinder through the four bolt holes 13.

[0038] A method for extruding titanium alloy sheets includes the following steps:

[0039] Step 1: Apply anti-oxidation coating to the extruded billet. Place the titanium alloy billet in the heating furnace for preheating at 150℃~180℃ and hold for 10 minutes. After exiting the furnace, spray the anti-oxidation coating evenly and then return it to the furnace at 180℃~200℃ and hold for 5 minutes.

[0040] Step 2: Heating the extruded billet. The coated titanium alloy billet is placed in an electric resistance furnace and heated to 930℃, and held at that temperature for 2.5 to 3 hours.

[0041] Step 3: Mold installation and preheating. Install the mold as required, and then preheat the extrusion cylinder and extrusion die 1 to a temperature of 250℃~350℃.

[0042] Step 4: Lubrication and wrapping of the billet. The surface of the heated titanium alloy billet is lubricated with a lubricant, and then wrapped for heat preservation.

[0043] Step 5: Mold lubrication. Spray grease evenly onto the inner surface of the extrusion cylinder, and spray grease evenly onto the inner surface of the transition groove 11 and stepped hole 12 of the extrusion die 1, with a spray thickness of 1mm.

[0044] Step Six: Billet Transfer. Quickly transfer the wrapped titanium alloy billet from the heating furnace to the extrusion equipment within 3 minutes.

[0045] Step 7: Extrusion. The extrusion equipment performs extrusion at the set extrusion speed of 10mm / s.

[0046] Step 8: Remove the titanium alloy sheet after the extrusion is complete.

[0047] The above are merely preferred embodiments of the present invention and do not limit the present invention. Any modifications, equivalent substitutions, or improvements made to the technical solutions described in the foregoing embodiments, or to some of the technical features, shall fall within the protection scope of the present invention.

Claims

1. A titanium alloy sheet extrusion forming apparatus, comprising an extrusion die (1), characterized in that: The extrusion die (1) is provided with a transition groove (11) on the side near the extrusion cylinder of the extrusion equipment. The transition groove (11) is configured as a round-and-square structure, transitioning from a circle at the outer end to a rectangle at the inner end. The extrusion die (1) has a stepped hole (12) on the side away from the extrusion cylinder of the extrusion equipment. The stepped hole (12) is composed of a large rectangular hole at the outer end and a small rectangular hole at the inner end. The two long sides of the rectangular transition groove (11) are high and the two short sides are low, so that when the sheet is extruded, the two vertical sides are formed first and the middle horizontal side is formed later. The ratio of the length of the large rectangular hole to the length of the small rectangular hole in the stepped hole (12) is 1.

2. The titanium alloy sheet extrusion forming apparatus according to claim 1, characterized in that, The ratio of the circular area to the rectangular area of ​​the transition groove (11) is 12.

3. The titanium alloy sheet extrusion forming apparatus according to claim 1, characterized in that, The extrusion die (1) has four bolt holes (13) evenly distributed around the circumference on one side edge of the extrusion cylinder near the extrusion equipment. The extrusion die (1) is fixed to the end of the extrusion cylinder through the four bolt holes (13).

4. A method for extruding titanium alloy sheets, using the titanium alloy sheet extrusion forming apparatus according to any one of claims 1-3, characterized in that, Includes the following steps: Step 1: Apply anti-oxidation coating to the extruded billet. Place the titanium alloy billet in the heating furnace for preheating at 150℃~180℃ and hold for 10 minutes. After exiting the furnace, spray the anti-oxidation coating evenly and then return it to the furnace at 180℃~200℃ and hold for 5 minutes. Step 2: Heating the extruded billet. The coated titanium alloy billet is placed in an electric resistance furnace and heated to 930℃, and held at that temperature for 2.5 to 3 hours. Step 3: Mold installation and preheating. Install the mold as required, and then preheat the extrusion cylinder and extrusion die (1) at a temperature of 250℃~350℃. Step 4: Lubrication and wrapping of the billet. The surface of the heated titanium alloy billet is lubricated with a lubricant, and then wrapped for heat preservation. Step 5: Mold lubrication. Spray grease evenly onto the inner surface of the extrusion cylinder, and spray grease evenly onto the inner surface of the transition groove (11) and stepped hole (12) of the extrusion die (1), with a spray thickness of 1mm. Step Six: Billet Transfer. Quickly transfer the wrapped titanium alloy billet from the heating furnace to the extrusion equipment within 3 minutes. Step 7: Extrusion. The extrusion equipment performs extrusion at the set extrusion speed of 10mm / s. Step 8: Remove the titanium alloy sheet after the extrusion is complete.

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