Titanium alloy precision ring part cutting process

Abstract

The invention discloses a titanium alloy precision ring part cutting process which comprises the following steps: 1, carrying out solution treatment on a titanium alloy blank at the treatment temperature of 925-955 DEG C for 1-1.5 hours, and then carrying out air cooling; secondly, after solution treatment, the blank is subjected to subzero treatment, the subzero temperature ranges from-196 DEG C, the subzero time ranges from 12 hours to 14 hours, and then air cooling is conducted; thirdly, the optimized cutting parameters are adopted for cutting the blank; fourthly, after cutting machining is completed, the part is subjected to annealing treatment, the heat preservation time is 3 hours, and then air cooling is conducted; and fifthly, after annealing treatment, the part is subjected to subzero treatment again, the subzero treatment time is 12 hours, and then air cooling is conducted. By optimizing cutting parameters and a subsequent treatment process, the cutting residual stress of the titanium alloy precision ring part is reduced, so that the dimensional stability of the part is improved, and meanwhile, the service life of the part is prolonged.

Description

Technical Field

[0001] This invention relates to the field of precision titanium alloy ring machining technology, specifically a cutting process for precision titanium alloy rings. Background Technology

[0002] Titanium alloy precision ring components are a type of high-performance ring structure made of titanium or titanium alloy as the base material, formed by precision forging, rolling or 3D printing and other processes. They have high strength, corrosion resistance and lightweight properties, and are widely used in aerospace, medical, chemical, shipbuilding and other fields. The strength of titanium alloy is higher than that of many metal materials. For example, the tensile strength of TC4 titanium alloy can reach 895-1050MPa, which is suitable for high strength requirements. Titanium alloy can withstand a variety of acid, alkali and corrosive environments, has a wider passive region than stainless steel, and its oxide film has strong resistance to chloride ions. The density of titanium is about 4.5g / cm³, only 60% of that of steel, which can significantly reduce the structural weight. Some titanium alloys still maintain good plasticity and toughness at ultra-low temperature of -253℃, and can still maintain high thermal stability after long-term use at high temperature of 550℃. Existing titanium alloy ring parts require machining during production. Current machining methods use sophisticated cutting equipment and processes, which are challenging and prone to generating high residual stress, affecting the dimensional stability and service life of the parts. Furthermore, existing machining processes result in high residual stress after cutting, impacting the subsequent stability and lifespan of the workpiece. Therefore, we propose a precision machining process for titanium alloy ring parts. Summary of the Invention

[0003] The purpose of this invention is to provide a machining process for precision titanium alloy ring parts, which solves the problems mentioned in the background art.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a machining process for precision titanium alloy ring parts, comprising the following process steps: Step 1: Perform solution treatment on the titanium alloy billet at a temperature of 925°C to 955°C for 1 to 1.5 hours, followed by air cooling; Step 2: After solution treatment, the billet is subjected to cryogenic treatment at a temperature of -196°C for 12 to 14 hours, followed by air cooling. Step 3: Perform cutting machining on the blank using optimized cutting parameters, including two stages: roughing and finishing. Step 4: After the cutting process is completed, the parts are annealed at 550°C for 3 hours, followed by air cooling. Step 5: After annealing, the parts are subjected to cryogenic treatment again at a temperature of -196°C for 12 hours, followed by air cooling.

[0005] It should be understood that optimizing cutting parameters and subsequent processing techniques can help reduce residual stress during the cutting of titanium alloy precision ring parts, thereby improving the dimensional stability of the parts and extending their service life.

[0006] In a preferred embodiment of the present invention, the cutting speed in the roughing stage is 40 m / min to 60 m / min, the depth of cut is 0.3 mm, and the feed rate is 0.1 mm / r.

[0007] In a preferred embodiment of the present invention, the cutting speed in the finishing stage is 60m / min to 90m / min, the depth of cut is 0.1mm, and the feed rate is 0.1mm / r.

[0008] In a preferred embodiment of the present invention, a carbide cutting tool is used in the cutting process, with a rake angle of 5° and a clearance angle of 15°.

[0009] In a preferred embodiment of the present invention, the method further includes a step of quality inspection of the finished titanium alloy precision ring part, the inspection content including dimensional accuracy, surface quality and residual stress.

[0010] In a preferred embodiment of the present invention, the dimensional accuracy is detected using a coordinate measuring machine.

[0011] In a preferred embodiment of the present invention, the surface quality detection is performed using a surface roughness meter.

[0012] In a preferred embodiment of the present invention, the residual stress is detected using X-ray diffraction.

[0013] Compared with the prior art, the beneficial effects of the present invention are as follows: This invention optimizes cutting parameters and subsequent processing techniques, which helps reduce residual stress during the cutting of titanium alloy precision ring parts, thereby improving the dimensional stability of the parts and extending their service life. Furthermore, the optimized cutting parameters and tool path planning help reduce vibration and deformation during the cutting process, thus improving machining accuracy and surface quality while ensuring machining efficiency. The combination of reasonable cutting parameter settings and efficient subsequent processing helps shorten the overall machining cycle, thereby improving production efficiency and providing strong support for the large-scale, high-quality production of titanium alloy precision ring parts. Attached Figure Description

[0014] Other features, objects, and advantages of the present invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings: Figure 1 This is a process flow diagram of a precision titanium alloy ring component cutting process according to the present invention. Detailed Implementation

[0015] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0016] This invention proposes a machining process for precision titanium alloy ring parts, the process steps of which are as follows: Material preparation Select TC4 titanium alloy blanks that meet the standards of the aerospace or medical device fields to ensure that the material composition is uniform and free from defects such as cracks and inclusions. Clean the blanks to remove surface oil and oxides. Use sandpaper or a polishing machine to grind the surface of the blanks to ensure that the surface finish meets the requirements of subsequent processing.

[0017] Solution treatment Place the billet in a high-temperature furnace and heat it to between 925°C and 955°C. Hold it at that temperature for 1 to 1.5 hours to allow the alloying elements to dissolve completely. After holding, turn off the heating source and allow the billet to cool naturally to room temperature in the furnace (air cooling).

[0018] Cryogenic treatment After solution treatment, the billet is quickly transferred to a liquid nitrogen tank for cryogenic treatment at a temperature of -196°C for 12 to 14 hours. After cryogenic treatment, the billet is removed and allowed to cool to room temperature in the air (air cooling).

[0019] Cutting High-precision CNC machine tools are selected and equipped with carbide cutting tools suitable for machining titanium alloys, with a rake angle of 5° and a clearance angle of 15°. Roughing: Cutting speed set to 40m / min to 60m / min, depth of cut 0.3mm, feed rate 0.1mm / r; Finishing: The cutting speed is increased to 60m / min to 90m / min, the depth of cut is reduced to 0.1mm, and the feed rate is kept at 0.1mm / r; Start the CNC machine tool, pre-set the tool shape and tool path, and then perform cutting according to the preset tool path. Ensure that the cutting fluid is fully lubricated and cooled during the cutting process, monitor parameters such as cutting force and cutting temperature during the cutting process, and adjust the cutting parameters in a timely manner to maintain machining stability.

[0020] Annealing The cut parts are placed in a high-temperature furnace and heated to 550°C. The temperature is maintained for 3 hours to release the internal stress of the parts. After the temperature maintenance is completed, the heating source is turned off and the parts are allowed to cool naturally to room temperature in the furnace (air cooling).

[0021] Cryogenic treatment After annealing, the parts are quickly transferred to a liquid nitrogen tank for a second cryogenic treatment at a temperature of -196°C for 12 hours. After the cryogenic treatment, the parts are removed and allowed to cool to room temperature in the air.

[0022] Quality Inspection A coordinate measuring machine is used to inspect the dimensional accuracy of the parts to ensure that the dimensions of the parts meet the design requirements. A surface roughness meter is used to inspect the surface roughness of the parts to ensure that the surface finish meets the usage requirements. X-ray diffraction is used to inspect the residual stress of the parts to ensure that the residual stress level meets the design requirements.

[0023] Example: Machining of TC4 titanium alloy precision ring parts Billet specifications: TC4 titanium alloy ring billet with an outer diameter of 100mm, an inner diameter of 80mm, and a thickness of 10mm.

[0024] Pre-cutting treatment: Solution treatment: Hold at 950°C for 1.2 hours, then air cool to room temperature.

[0025] Cryogenic treatment: Hold at -196°C for 12 hours, then air-cool to room temperature.

[0026] Cutting process: Roughing: Cutting speed 50m / min, depth of cut 0.3mm, feed rate 0.1mm / r; Finishing: Cutting speed 75m / min, depth of cut 0.1mm, feed rate 0.1mm / r.

[0027] Follow-up processing: Annealing: Hold at 550°C for 3 hours, then air cool to room temperature.

[0028] Cryogenic treatment: Hold at -196°C for 12 hours, then air-cool to room temperature.

[0029] Quality inspection results: Dimensional accuracy: outer diameter deviation ±0.02mm, inner diameter deviation ±0.015mm, thickness deviation ±0.01mm.

[0030] Surface quality: Surface roughness Ra≤0.4μm.

[0031] Residual stress: The residual stress from cutting is reduced to less than 10% of its initial value.

[0032] In summary, this invention, by optimizing cutting parameters and subsequent processing techniques, helps reduce residual stress during the cutting of titanium alloy precision ring parts, thereby improving the dimensional stability of the parts and extending their service life. Furthermore, the optimized cutting parameters and tool path planning help reduce vibration and deformation during the cutting process, thus improving machining accuracy and surface quality while ensuring machining efficiency. The combination of reasonable cutting parameter settings and efficient subsequent processing helps shorten the overall machining cycle, thereby improving production efficiency and providing strong support for the large-scale, high-quality production of titanium alloy precision ring parts.

[0033] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or basic characteristics. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within the present invention.

[0034] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A machining process for precision titanium alloy ring parts, characterized in that: The process includes the following steps: Step 1: Perform solution treatment on the titanium alloy billet at a temperature of 925°C to 955°C for 1 to 1.5 hours, followed by air cooling; Step 2: After solution treatment, the billet is subjected to cryogenic treatment at a temperature of -196°C for 12 to 14 hours, followed by air cooling. Step 3: Perform cutting machining on the blank using optimized cutting parameters, including two stages: roughing and finishing. Step 4: After the cutting process is completed, the parts are annealed at 550°C for 3 hours, followed by air cooling. Step 5: After annealing, the parts are subjected to cryogenic treatment again at a temperature of -196°C for 12 hours, followed by air cooling.

2. The machining process for a precision titanium alloy ring component according to claim 1, characterized in that: The cutting speed in the roughing stage is 40 m / min to 60 m / min, the depth of cut is 0.3 mm, and the feed rate is 0.1 mm / r.

3. The machining process for a precision titanium alloy ring component according to claim 1, characterized in that: The cutting speed during the finishing stage is 60 m / min to 90 m / min, the depth of cut is 0.1 mm, and the feed rate is 0.1 mm / r.

4. The machining process for a precision titanium alloy ring component according to claim 1, characterized in that: The cutting process uses a carbide tool with a rake angle of 5° and a clearance angle of 15°.

5. The machining process for a precision titanium alloy ring component according to claim 1, characterized in that: It also includes a step of quality inspection of the finished titanium alloy precision ring parts, including dimensional accuracy, surface quality and residual stress.

6. The machining process for a precision titanium alloy ring component according to claim 5, characterized in that: The dimensional accuracy is measured using a coordinate measuring machine.

7. The machining process for a precision titanium alloy ring component according to claim 5, characterized in that: The surface quality was tested using a surface roughness meter.

8. The machining process for a precision titanium alloy ring component according to claim 5, characterized in that: The residual stress was detected using X-ray diffraction.

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