Titanium alloy for fastener at extremely low temperature in aerospace field and process of titanium alloy

Abstract

The invention relates to the technical field of titanium alloys, and discloses a titanium alloy for a fastener at extremely low temperature in the aerospace field and a process of the titanium alloy, the titanium alloy comprises the following raw materials in parts by weight: 100-40 parts of titanium, 10-30 parts of a composite material, 20-50 parts of aluminum and 5-20 parts of steel, beta titanium is used for 100-40 parts of titanium, and the content of titanium powder accounts for about 45% of the content of the fastener; a carbon fiber material is used as the 10-30 parts of the composite material, the carbon fiber material is internally manufactured by inert gas at the temperature of 1000 DEG C or above in a high-temperature environment, the carbon content of carbon fibers is 95% or above, the 20-50 parts of aluminum accounts for about 27% of the content of the fastener, and a small amount of zirconium, vanadium, tungsten, molybdenum and other elements are added when the aluminum material is produced. According to the titanium alloy for the fastener at the extremely low temperature in the aerospace field and the process of the titanium alloy, when the fastener is manufactured, a carbon fiber material is added into the fastener, so that the density of the fastener is reduced, the high temperature resistance and fatigue resistance of the fastener are improved, and the cost is saved.

Description

Technical Field

[0001] The present invention relates to the technical field of titanium alloys, and in particular to a titanium alloy for fasteners at extremely low temperatures in the aerospace field and a process thereof. Background Art

[0002] Titanium alloy refers to a variety of alloy metals made of titanium and other metals. Titanium is an important structural metal developed in the 1950s. Titanium alloy has high strength, good corrosion resistance and high heat resistance. In the 1950s and 1960s, the main focus was on the development of high-temperature titanium alloys for aerospace engines and structural titanium alloys for aircraft bodies.

[0003] In the prior art, due to the high value of titanium alloy, it is difficult to use all titanium alloy structures in the manufacture of fasteners in the aerospace field. Generally, titanium alloy is mixed with other materials. The ultimate goal is to make it strong and resistant to high temperatures. However, if the constituent materials of existing titanium alloy fasteners want to maintain their strength and high temperature resistance, the titanium content can only be increased, but this will greatly increase the cost. Therefore, it is necessary to invent a titanium alloy and process for fasteners in the aerospace field at extremely low temperatures to solve the above problems. Summary of the invention

[0004] 1. Technical issues to be solved

[0005] In view of the deficiencies in the prior art, the present invention provides a titanium alloy for fasteners at extremely low temperatures in the aerospace field and a process thereof. When manufacturing the fasteners, there is no need to increase the titanium content. Only the constituent materials of the fasteners need to be changed. Carbon fiber materials are added inside the fasteners, thereby reducing the density of the fasteners, improving the high temperature resistance and fatigue resistance of the fasteners, and saving costs. Secondly, during use, when the titanium alloy is cut and polished, it is placed in a sealed environment and filled with sealing gas, thereby avoiding the possibility of combustion when the titanium alloy comes into contact with air during cutting and polishing, thereby improving production efficiency.

[0006] (II) Technical solution

[0007] To realize the above-mentioned titanium alloy, the present invention provides the following technical solution: a titanium alloy for fasteners at extremely low temperatures in the aerospace field, comprising the following raw materials in the following weight proportions: 10-40 parts of titanium, 10-30 parts of composite materials, 20-50 parts of aluminum, and 5-20 parts of steel.

[0008] Preferably, the 10-40 parts of titanium are β-titanium, and the content of titanium powder accounts for 45% of the content of the fastener.

[0009] Preferably, 10-30 parts of the composite material are made of carbon fiber material, and the carbon fiber material is manufactured in an inert gas at a temperature of more than 1000 degrees under a high temperature environment, and the carbon content of the carbon fiber is more than 95%.

[0010] Preferably, the 20-50 parts of aluminum accounts for 27% of the content of the fastener, and zirconium, vanadium, tungsten and molybdenum elements are added during the production of the aluminum material.

[0011] Preferably, 5-20 parts of the steel are austenitic steel, and the austenitic steel accounts for 5% of the content of the fastener.

[0012] A titanium alloy process for fasteners at extremely low temperatures in the aerospace field comprises the following steps:

[0013] S1. Check the material ratio, calibrate the thermometer, check whether the facilities can operate normally, clean the furnace, and inject the materials into the natural gas furnace after cleaning.

[0014] S2. Heat the natural gas furnace to 1000-1200 degrees Celsius, heat the material at high temperature for 2-3 hours, and when the material is in liquid form, inject it into the mold.

[0015] S3. After the material is cooled and formed, it is aligned for forging and blanking. The pressing amount per stroke shall not exceed 80mm. When the total deformation reaches between 20% and 30%, the pressing amount shall be increased to a maximum of 20mm. When the material temperature drops, stop forging.

[0016] S4. Cut and grind the surface of the material, fix the material to the clamp, use a cutting disc to cut and grind the surface burrs, and recycle the waste generated by grinding.

[0017] S5. The final material is heated and punched, and the details are constructed. The fasteners are then cooled and dried in a dryer, and finally the surface is coated.

[0018] Preferably, in step S2, a slightly oxidizing atmosphere needs to be maintained inside the natural gas furnace, and the temperature inside the natural gas furnace should be prevented from being higher than 1200 degrees Celsius during operation.

[0019] Preferably, in step S4, the material is placed in a sealed environment during cutting and polishing, and the interior is filled with inert gas.

[0020] Preferably, in step S5, the temperature of the drying machine is 150 degrees Celsius and the drying time is 10 minutes.

[0021] (III) Beneficial effects

[0022] Compared with the prior art, the present invention provides a titanium alloy for fasteners at extremely low temperatures in the aerospace field and a process thereof, which has the following beneficial effects:

[0023] 1. The titanium alloy and its process for fasteners in the aerospace field at extremely low temperatures do not need to increase the titanium content when manufacturing fasteners. Instead, it is necessary to change the constituent materials of the fasteners and add carbon fiber materials inside the fasteners, thereby reducing the density of the fasteners, improving the high temperature resistance and fatigue resistance of the fasteners, and saving costs.

[0024] 2. When the titanium alloy used for fasteners in the aerospace field is cut and polished at extremely low temperatures, the titanium alloy is placed in a sealed environment and filled with sealing gas, thereby avoiding the possibility of combustion when the titanium alloy comes into contact with air during cutting and polishing, thereby improving production efficiency. DETAILED DESCRIPTION

[0025] The following will combine the contents in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] Embodiment 1:

[0027] The present invention provides a technical solution: a titanium alloy for fasteners at extremely low temperatures in the aerospace field, comprising the following raw materials in proportion by weight: 30 parts of beta titanium, 15 parts of carbon fiber material, 20 parts of aluminum, and 5 parts of austenitic steel.

[0028] A titanium alloy process for fasteners at extremely low temperatures in the aerospace field comprises the following steps:

[0029] S1. Check the material ratio, calibrate the thermometer, check whether the facilities can operate normally, clean the furnace, and inject the materials into the natural gas furnace after cleaning.

[0030] S2. Heat the natural gas furnace to 1200 degrees Celsius, heat the material at high temperature for 2 hours, and when the material is in liquid form, inject it into the mold.

[0031] S3. After the material is cooled and formed, it is aligned and forged. The pressing amount per stroke is 50mm. When the total deformation reaches 20%, the pressing amount is increased by 20mm. When the material temperature drops, the forging is stopped.

[0032] S4. Cut and grind the surface of the material, fix the material to the clamp, use a cutting disc to cut and grind the surface burrs, and recycle the waste generated by grinding.

[0033] S5. The final material is heated and punched, and the details are constructed. The fasteners are then cooled and dried in a dryer, and finally the surface is coated.

[0034] Embodiment 2:

[0035] The present invention provides a technical solution: a titanium alloy for fasteners at extremely low temperatures in the aerospace field, comprising the following raw materials in proportion by weight: 40 parts of beta titanium, 20 parts of carbon fiber material, 20 parts of aluminum, and 10 parts of austenitic steel.

[0036] A titanium alloy process for fasteners at extremely low temperatures in the aerospace field comprises the following steps:

[0037] S1. Check the material ratio, calibrate the thermometer, check whether the facilities can operate normally, clean the furnace, and inject the materials into the natural gas furnace after cleaning.

[0038] S2. Heat the natural gas furnace to 1100 degrees Celsius, heat the material at high temperature for 2.5 hours, and when the material is in liquid form, inject it into the mold.

[0039] S3. After the material is cooled and formed, it is aligned and forged. The pressing amount per stroke is 70mm. When the total deformation reaches 20%, the pressing amount is increased by 5mm. When the material temperature drops, the forging is stopped.

[0040] S4. Cut and grind the surface of the material, fix the material to the clamp, use a cutting disc to cut and grind the surface burrs, and recycle the waste generated by grinding.

[0041] S5. The final material is heated and punched, and the details are constructed. The fasteners are then cooled and dried in a dryer, and finally the surface is coated.

[0042] Embodiment 3:

[0043] The present invention provides a technical solution: a titanium alloy for fasteners at extremely low temperatures in the aerospace field, comprising the following raw materials in proportion by weight: 25 parts of beta titanium, 12 parts of carbon fiber material, 20 parts of aluminum, and 7 parts of austenitic steel.

[0044] A titanium alloy process for fasteners at extremely low temperatures in the aerospace field comprises the following steps:

[0045] S1. Check the material ratio, calibrate the thermometer, check whether the facilities can operate normally, clean the furnace, and inject the materials into the natural gas furnace after cleaning.

[0046] S2. Heat the natural gas furnace to 1050 degrees Celsius, heat the material at high temperature 2, and when the material is in liquid form, inject it into the mold.

[0047] S3. After the material is cooled and formed, it is aligned and forged. The pressing amount per stroke is 40mm. When the total deformation reaches 22%, the pressing amount is increased by 5mm. When the material temperature drops, the forging is stopped.

[0048] S4. Cut and grind the surface of the material, fix the material to the clamp, use a cutting disc to cut and grind the surface burrs, and recycle the waste generated by grinding.

[0049] S5. The final material is heated and punched, and the details are constructed. The fasteners are then cooled and dried in a dryer, and finally the surface is coated.

[0050] Embodiment 4:

[0051] The present invention provides a technical solution: a titanium alloy for fasteners at extremely low temperatures in the aerospace field, comprising the following raw materials in proportion by weight: 35 parts of beta titanium, 17 parts of carbon fiber material, 20 parts of aluminum, and 7 parts of austenitic steel.

[0052] A titanium alloy process for fasteners at extremely low temperatures in the aerospace field comprises the following steps:

[0053] S1. Check the material ratio, calibrate the thermometer, check whether the facilities can operate normally, clean the furnace, and inject the materials into the natural gas furnace after cleaning.

[0054] S2. Heat the natural gas furnace to 1150 degrees Celsius, heat the material at high temperature for 2.7 hours, and when the material is in liquid form, inject it into the mold.

[0055] S3. After the material is cooled and formed, it is aligned and forged. The pressing amount per stroke is 80mm. When the total deformation reaches 30%, the pressing amount is increased by 10mm. When the material temperature drops, the forging is stopped.

[0056] S4. Cut and grind the surface of the material, fix the material to the clamp, use a cutting disc to cut and grind the surface burrs, and recycle the waste generated by grinding.

[0057] S5. The final material is heated and punched, and the details are constructed. The fasteners are then cooled and dried in a dryer, and finally the surface is coated.

[0058] Embodiment 5:

[0059] The present invention provides a technical solution: a titanium alloy for fasteners at extremely low temperatures in the aerospace field, comprising the following raw materials in proportion by weight: 38 parts of beta titanium, 19 parts of carbon fiber material, 20 parts of aluminum, and 5 parts of austenitic steel.

[0060] A titanium alloy process for fasteners at extremely low temperatures in the aerospace field comprises the following steps:

[0061] S1. Check the material ratio, calibrate the thermometer, check whether the facilities can operate normally, clean the furnace, and inject the materials into the natural gas furnace after cleaning.

[0062] S2. Heat the natural gas furnace to 1000 degrees Celsius, heat the material at high temperature for 2 hours, and when the material is in liquid form, inject it into the mold.

[0063] S3. After the material is cooled and formed, it is aligned and forged. The pressing amount per stroke is 80mm. When the total deformation reaches 25%, the pressing amount is increased by 15mm. When the material temperature drops, the forging is stopped.

[0064] S4. Cut and grind the surface of the material, fix the material to the clamp, use a cutting disc to cut and grind the surface burrs, and recycle the waste generated by grinding.

[0065] S5. The final material is heated and punched, and the details are constructed. The fasteners are then cooled and dried in a dryer, and finally the surface is coated.

[0066] Embodiment 6:

[0067] The present invention provides a technical solution: a titanium alloy for fasteners at extremely low temperatures in the aerospace field, comprising the following raw materials in proportion by weight: 40 parts of beta titanium, 20 parts of carbon fiber material, 20 parts of aluminum, and 10 parts of austenitic steel.

[0068] A titanium alloy process for fasteners at extremely low temperatures in the aerospace field comprises the following steps:

[0069] S1. Check the material ratio, calibrate the thermometer, check whether the facilities can operate normally, clean the furnace, and inject the materials into the natural gas furnace after cleaning.

[0070] S2. Heat the natural gas furnace to 1200 degrees Celsius, heat the material at high temperature for 2.5 hours, and when the material is in liquid form, inject it into the mold.

[0071] S3. After the material is cooled and formed, it is aligned and forged. The pressing amount per stroke is 70mm. When the total deformation reaches 20%, the pressing amount is increased by 20mm. When the material temperature drops, the forging is stopped.

[0072] S4. Cut and grind the surface of the material, fix the material to the clamp, use a cutting disc to cut and grind the surface burrs, and recycle the waste generated by grinding.

[0073] S5. The final material is heated and punched, and the details are constructed. The fasteners are then cooled and dried in a dryer, and finally the surface is coated.

[0074] The titanium alloy and process for fasteners in the aerospace field at extremely low temperatures do not need to increase the titanium content when manufacturing fasteners. It is only necessary to change the constituent materials of the fasteners and add carbon fiber materials inside the fasteners, which reduces the density of the fasteners, improves the high temperature resistance and fatigue resistance of the fasteners, and saves costs. Secondly, during use, when the titanium alloy is cut and polished, it is placed in a sealed environment and filled with sealing gas, which avoids the possibility of combustion when it comes into contact with air during cutting and polishing, thereby improving production efficiency.

[0075] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A titanium alloy for fasteners at extremely low temperatures in the aerospace field, characterized in that: The invention comprises the following raw materials in proportion by weight: 10-40 parts of titanium, 10-30 parts of composite material, 20-50 parts of aluminum and 5-20 parts of steel.

2. The titanium alloy for fasteners in the aerospace field at extremely low temperatures according to claim 1, characterized in that: The titanium 10-40 parts is β-titanium, and the content of titanium powder accounts for 45% of the content of the fastener.

3. The titanium alloy for fasteners in the aerospace field at extremely low temperatures according to claim 1, characterized in that: The composite material uses 10-30 parts of carbon fiber material, and the carbon fiber material is manufactured in an inert gas at a temperature of more than 1000 degrees under a high temperature environment, and the carbon content of the carbon fiber is more than 95%.

4. The titanium alloy for fasteners in the aerospace field at extremely low temperatures according to claim 1, characterized in that: The 20-50 parts of aluminum account for 27% of the fastener content, and zirconium, vanadium, tungsten and molybdenum elements are added during the production of the aluminum material.

5. The titanium alloy for fasteners in the aerospace field at extremely low temperatures according to claim 1, characterized in that: 5-20 parts of the steel are austenitic steel, and the austenitic steel accounts for 5% of the content of the fastener.

6. A titanium alloy process for fasteners at extremely low temperatures in the aerospace field, characterized in that: The following steps are involved: S1. Check the material ratio, calibrate the thermometer, check whether the facilities can operate normally, clean the furnace, and inject the materials into the natural gas furnace after cleaning; S2. Heat the natural gas furnace to 1000-1200 degrees Celsius, heat the material at high temperature for 2-3 hours, and inject it into the mold when the material is in liquid state; S3, after the material is cooled and formed, it is aligned for forging and blanking. The pressing amount per stroke does not exceed 80mm. When the total deformation reaches between 20% and 30%, the pressing amount is increased to a maximum of 20mm. When the material temperature drops, stop forging. S4, cutting and grinding the surface of the material, fixing the material to the clamping part, cutting and grinding the surface burrs with a cutting disc, and recycling the waste generated by grinding; S5. The final material is heated and punched, and the details are constructed. The fasteners are then cooled and dried in a dryer, and finally the surface is coated.

7. The titanium alloy process for fasteners in the aerospace field at extremely low temperatures according to claim 6, characterized in that: In step S2, a slightly oxidizing atmosphere needs to be maintained inside the natural gas furnace, and during operation, the temperature inside the natural gas furnace should be prevented from being higher than 1200 degrees Celsius.

8. The titanium alloy process for fasteners in the aerospace field at extremely low temperatures according to claim 6, characterized in that: In step S4, the material is placed in a sealed environment during cutting and polishing, and the interior is filled with inert gas.

9. The titanium alloy process for fasteners in the aerospace field at extremely low temperatures according to claim 6, characterized in that: In step S5, the temperature of the drying machine is 150 degrees Celsius and the drying time is 10 minutes.