Titanium alloy skin processing method

Abstract

The application provides a titanium alloy skin processing method, comprising the following steps: S1, making a scribe groove on a tool; S2, placing a scribe device in the scribe groove; S3, scribing on the titanium alloy skin; S4, cutting and shaping the titanium alloy skin; S5, checking the fitting degree; and S6, processing the surface of the part. The titanium alloy skin processing method can be applied to the processing of all titanium alloy skin parts, the processed parts have high precision, the processing cost is low, the operation is simple and fast, and the problem of unclear edge line of the titanium alloy skin part is effectively solved, so that the method can be widely promoted and popularized.

Description

Technical Field

[0001] This invention belongs to the field of sheet metal manufacturing and processing, and specifically relates to a method for processing titanium alloy skin. Background Technology

[0002] Titanium alloy skins are internal and external components that form the aerodynamic shape of aircraft engines. They are characterized by large size, diverse varieties, complex shapes, and small production batches. The level of advancement in their manufacturing is an important indicator of a country's aircraft manufacturing capabilities and level. Currently, aircraft skins are mainly divided into metallic skins and non-metallic skins. Metallic skins are further divided into non-ferrous and ferrous metallic skins, while non-metallic skins are composite material skins. The tail cowling structures of current aircraft primarily use titanium alloy skins and high-temperature alloy skins. Titanium alloy skins are mainly produced using hot forming processes, which are relatively mature.

[0003] Because titanium alloy parts are formed using thermoforming, an anti-oxidation coating is applied to the steel mold to prevent oxidation and scale formation during heating, which would affect the forming accuracy. However, this coating covers the cutting lines on the edges of the parts formed on the mold, preventing these lines from being imprinted on the parts after forming. This results in a lack of a cutting reference point during waste removal, impacting cutting accuracy. While five-axis laser cutting equipment can address this issue, it leads to excessively high manufacturing costs, hindering cost reduction. Therefore, a low-cost solution is needed to address this problem. Summary of the Invention

[0004] To address the aforementioned problems, this invention provides a method for processing titanium alloy skin. By modifying the processing fixture, edge lines are drawn on the titanium alloy skin using the fixture, followed by cutting and subsequent processing of the titanium alloy skin. Specifically, the method includes the following steps:

[0005] S1: A scribing groove is made outside the edge line of the part on the machining fixture for titanium alloy skin. The machining fixture is a device used to clamp the machining part. Its shape is not fixed and changes according to the shape of the machining part. This invention is made for all titanium alloy skin machining methods, so scribing grooves can be made on all machining fixtures involving titanium alloy skin machining.

[0006] In this step, in order to ensure the accuracy of the scribing of the parts and make the processed parts more in line with the finished product requirements, the scribing groove is set around the edge of the parts, located outside the edge of the parts, at a distance of 50nm. At the same time, in order to ensure that the scribing device can move smoothly in the scribing groove and complete the scribing task precisely, the scribing groove can be processed into a groove with a depth of 10mm and a width of 10mm.

[0007] To ensure the machining accuracy of the scribing groove and avoid errors caused by repeated milling during machining, this invention uses a φ10 CNC milling cutter to perform CNC machining on the scribing groove, so that the machining process can be completed in one go. During the machining process, the scribing groove machining model is designed and manufactured using CATIA programming.

[0008] S2: Place a scribing device within the scribing groove, with the scribing end of the device facing the titanium alloy skin. The scribing device is capable of scribing the desired edge lines on the titanium alloy skin and needs to meet the requirements of scribing and moving within the scribing groove. In this invention, the scribing end of the scribing device is a red / blue pencil or an electric pen, and the bottom is an adjustable sliding plate. The scribing device can move within the scribing groove via the sliding plate, and the length of the scribing end can be adjusted by adjusting the sliding plate.

[0009] S3: Fix the titanium alloy skin on the tooling to ensure that the titanium alloy skin cannot move. Then move the scribing device along the scribing groove. Since the scribing end of the scribing device is in direct contact with the surface of the titanium alloy skin, the scribing end can scribing the processing edge line on the titanium alloy skin while the scribing device moves along the scribing groove.

[0010] S4: After completing the scribing work, cut the titanium alloy skin according to the scribing processing edge line, remove the excess material on the titanium alloy skin to obtain the rough part, and then place the obtained rough part on the mold for shaping. The shaping work improves the fit between the rough part and the mold. This step needs to be processed until the fit between the rough part and the mold meets the requirements.

[0011] In this step, to make removing waste material from the parts easier, a manual roller shear is used to remove excess material from the titanium alloy skin. Meanwhile, to ensure proper fit between the skin and the mold during manual shaping, an iron or wooden mallet is used.

[0012] S5: Perform a fit test between the calibrated part and the mold. If the fit meets the process requirements, proceed to S6. If the fit does not meet the requirements, return to S3 and repeat S3-S5 until the fit test passes the process requirements parameters.

[0013] S6: According to the requirements of production and manufacturing, the surface treatment process of the parts is carried out according to the production process. After the treatment process is completed, the manufacturing of all parts is completed, and the final titanium alloy skin parts are obtained.

[0014] In all the above steps, to ensure the mold maintains its shape during processing and thus guarantees the accuracy of the machined parts, the mold is made of steel or medium-silicon molybdenum. Of course, those skilled in the art can also use a mold made of a material with higher rigidity than steel.

[0015] The titanium alloy skin processing method provided by this invention is applicable to the processing of all titanium alloy skin parts. The processed parts have high precision, low processing cost, and are simple and quick to operate. It effectively solves the problem of unclear edge lines in the processing of titanium alloy skin parts and can be widely promoted and popularized. Implementation

[0016] To further illustrate the concept of this invention, specific embodiments will be provided below for detailed explanation. These embodiments are merely illustrative and explanatory and should not be construed as limiting the scope of protection of this invention. All technologies implemented based on the content of this invention are covered within the scope of protection intended by this invention. Example

[0017] This embodiment provides a method for processing titanium alloy skin, including the following steps:

[0018] S1: Create a scribing groove outside the edge line of the part on the machining titanium alloy skin tooling. The scribing groove is set around the edge line of the part, located outside the edge line of the part, at a distance of 50nm, with a groove depth of 10mm and a width of 10mm.

[0019] The scribing groove was CNC machined using a φ10 CNC milling cutter, and the machining model was designed and manufactured using CATIA programming.

[0020] S2: Place the scribing device in the scribing groove, with the scribing end of the device facing the titanium alloy skin. The scribing end of the scribing device is a red and blue pencil, and the bottom is an adjustable sliding plate. The sliding plate can slide within the scribing groove, and the length of the scribing end can be adjusted by adjusting the sliding plate.

[0021] S3: Fix the titanium alloy skin, and then move the scribing device along the scribing groove to scribing the machining edge line on the titanium alloy skin.

[0022] S4: After marking the processing edge line, use a manual rolling shear to cut the titanium alloy skin according to the processing edge line to remove excess material and obtain the rough part. Then, place the rough part on a steel mold and use an iron hammer to straighten it until the rough part and the mold meet the requirements.

[0023] S5: Check the fit between the calibrated part and the mold. If the fit meets the process requirements, proceed to S6. If the fit does not meet the requirements, return to S3 and repeat S3-S5.

[0024] S6: Perform surface treatment on the parts to obtain the finished titanium alloy skin parts. Example

[0025] This embodiment provides a method for processing titanium alloy skin, including the following steps:

[0026] S1: Create a scribing groove outside the edge line of the part on the machining titanium alloy skin tooling. The scribing groove is set around the edge line of the part, located outside the edge line of the part, at a distance of 50nm, with a groove depth of 10mm and a width of 10mm.

[0027] The scribing groove was CNC machined using a φ10 CNC milling cutter, and the machining model was designed and manufactured using CATIA programming.

[0028] S2: Place the scribing device inside the scribing groove, with the scribing end of the device facing the titanium alloy skin. The scribing end of the scribing device is an electric pen, and the bottom is an adjustable sliding plate. The sliding plate can slide inside the scribing groove, and the length of the scribing end can be adjusted by adjusting the sliding plate.

[0029] S3: Fix the titanium alloy skin, and then move the scribing device along the scribing groove to scribing the machining edge line on the titanium alloy skin.

[0030] S4: After marking the processing edge line, use a manual rolling shear to cut the titanium alloy skin according to the processing edge line to remove excess material and obtain the rough part. Then, place the rough part on the silicon molybdenum mold and use a wooden mallet to shape it until the rough part and the mold meet the requirements.

[0031] S5: Check the fit between the calibrated part and the mold. If the fit meets the process requirements, proceed to S6. If the fit does not meet the requirements, return to S3 and repeat S3-S5.

[0032] S6: Perform surface treatment on the parts to obtain the finished titanium alloy skin parts.

[0033] The titanium alloy skin processing method provided by this invention can be implemented in many ways and by many means. The above is merely a preferred embodiment provided by way of example. Those skilled in the art can conceive of many modifications, alterations, and substitutions without departing from this invention. It should be understood that various alternatives to the embodiments of the invention described herein can be employed in the practice of this invention. The appended claims are intended to define the scope of the invention and therefore cover the methods within the scope of these claims and their equivalents. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of this invention.

Claims

1. A method for processing titanium alloy skin, characterized in that, Includes the following steps: S1: Create a scribing groove outside the edge line of the part on the machining titanium alloy skin tooling. The scribing groove is located 50nm outside the edge line of the part, with a depth of 10mm and a width of 10mm, and is set around the edge line of the part. S2: Place a scribing device in the scribing groove, with the scribing end of the scribing device facing the titanium alloy skin placement direction; the scribing end of the scribing device is a red and blue pencil or an electric pen, and the bottom end is an adjustable sliding plate, which can move within the scribing groove via the sliding plate. S3: Use tooling to fix the titanium alloy skin, move the scribing device along the scribing groove, and scribing the processing edge line on the titanium alloy skin; S4: Cut the titanium alloy skin according to the marked processing edge line, remove the excess material to obtain the rough part, and then place the rough part on the mold for shaping until the rough part and the mold meet the requirements. S5: Check the fit between the calibrated parts and the mold. If the fit meets the requirements, proceed to S6; otherwise, proceed to S3. S6: Perform surface treatment of the parts to complete the manufacturing process.

2. The titanium alloy skin processing method according to claim 1, characterized in that: In step S1, the scribing groove is CNC machined using a φ10 CNC milling cutter.

3. The titanium alloy skin processing method according to claim 2, characterized in that: In step S1, the grooving machining model is designed and manufactured using CATIA programming.

4. The titanium alloy skin processing method according to claim 1, characterized in that: The mold is made of steel or medium-silicon molybdenum.

5. The titanium alloy skin processing method according to claim 1, characterized in that: In step S4, the titanium alloy skin is cut using a manual rolling shear.

6. The titanium alloy skin processing method according to claim 1, characterized in that: In step S4, a hammer is used for shaping. The hammer is made of iron or wood.