Turning control method for sealing labyrinth

Abstract

The invention discloses a turning control method for sealing labyrinth teeth, which belongs to the field of machining, and comprises the following steps of: mounting a turbine disc on turning equipment, and clamping and aligning; turning the outer diameter of the sealing tooth by adopting an offset tool, and cooling a tool nose of the offset tool by adopting cooling liquid in the machining process; a forming tool is designed according to the tooth profile data of the sealing labyrinth, and rough machining is conducted on the sealing labyrinth through the forming tool; the sealing labyrinth is subjected to finish machining through a contour machining tool, the allowance of the tooth side and the groove bottom of the sealing labyrinth is removed, and a certain allowance is reserved on the tooth side and the groove bottom; and a new contour machining tool is adopted and combined with a numerical control machining program to remove the allowance, and machining of the sealing labyrinth is completed. The turning control method for the sealing labyrinth has excellent performance in the aspects of improving the machining efficiency, reducing stress and inhibiting a white layer, and provides an effective guarantee for high-quality machining of the sealing labyrinth.

Description

Technical Field

[0001] The present invention relates to the field of machining, and particularly to a turning control method for a sealing labyrinth tooth. Background Art

[0002] The sealing labyrinth teeth of a certain turbofan engine turbine disk are composed of four teeth, with small tooth profile dimensions: tooth height 2.55 mm, tooth width 2.19 mm, tooth root fillet R0.64 mm, and tooth side angle 20°. It is not easy to cool and observe during machining. The sealing teeth cooperate with the coating of the stator casing to play a role in gas sealing. The machining is completed by turning on a numerically controlled lathe, and the part structure is as shown in the appendix. Figure 1 There is a group of sealing teeth on each of the upper and lower sides of the disk. During use, for the group of 4 sealing labyrinth teeth on the upper side, due to the high use temperature and harsh working conditions, after a factory test run, the crack rate of the tooth tips of the sealing teeth detected by fluorescence reaches 20%. The reason for the formation of cracks in the sealing labyrinth teeth is as follows: the thermal stress of the sealing labyrinth teeth during operation is superimposed with other stresses, promoting the initiation of cracks. Although research has been carried out on process plans, cutting tools, cutting parameters, tool change points, cooling methods, etc., after metallographic inspection of the crack parts of the sealing teeth, it is found that there is a white layer with a thickness of 0.003 mm to 0.004 mm on the surface of the labyrinth teeth, which can be determined as the main reason for the cracks in the sealing teeth after the test run. A special method must be used to control the white layer on the surface of the sealing teeth. The white layer refers to a hardened layer with a different structure from the matrix formed on the metal surface due to severe plastic deformation, high temperature, or phase transformation during the machining process.

[0003] In order to inhibit the formation of the white layer, "A Turning Machining Method for the Surface Integrity of a Nickel-based Powder Superalloy Disk", the turning parameters of this method include turning speed, turning feed rate, and turning depth. The tools include cubic boron nitride tools or cemented carbide tools, and it includes the turning machining of the disk, the treatment of the tool mark at the joint of the turning area, and the detection of surface integrity. The tools and turning parameters used for the allowance of 0 - 0.2 mm are specified, aiming to reduce the surface defects after disk machining and improve the machining quality. However, the disadvantages of this method are: it does not confirm the indicators affecting the fatigue performance during the use of the disk, and only explains the surface integrity of the turning from the control aspects of tools and cutting parameters, lacking guidance for solving practical problems in engineering. Summary of the Invention

[0004] Aiming at the problems existing in the prior art, the present invention provides a turning control method for a sealing labyrinth tooth, which can effectively inhibit cracks in the sealing labyrinth tooth and improve the qualification rate of the turbine disk.

[0005] The present invention is realized through the following technical solutions: A turning control method for a sealing labyrinth tooth includes the following steps: Step 1: Install the turbine disk on the turning equipment and perform clamping and alignment. Step 2: Use a parting tool to turn the outer diameter of the seal teeth. During the machining process, use coolant to cool the tip of the tool. Step 3: Design a forming tool according to the tooth profile data of the seal labyrinth teeth, and use the forming tool to rough machine the seal labyrinth teeth. Step 4: Use a contour machining tool to finish machine the seal labyrinth teeth, remove the surplus on the tooth side and the bottom of the groove of the seal labyrinth teeth, and leave a certain amount of surplus on the tooth side and the bottom of the groove. Step 5: Use a new contour machining tool and combine it with a numerical control machining program to remove the surplus, and complete the machining of the seal labyrinth teeth.

[0006] Preferably, the method of using coolant to cool the tip of the parting tool is as follows: Make the injection angle of the coolant form an angle of 45° with the cutting surface of the tool, and the distance between the coolant outlet and the cutting edge of the tool is 100 - 200 mm.

[0007] Preferably, in Step 3, when using the forming tool to rough machine the seal labyrinth teeth, the surplus on one side of the labyrinth teeth is greater than 0.2 mm.

[0008] Preferably, during the rough machining process of the seal labyrinth teeth in Step 3, the wear amount of the cutting edge of the tool is less than 0.2 mm.

[0009] Preferably, the contour machining tool in Step 4 is a customized tool, and the contour machining tool is customized according to the tooth profile data of the seal labyrinth teeth.

[0010] Preferably, the fillet of the contour machining tool is smaller than the fillet of the seal labyrinth teeth.

[0011] Preferably, the method of finishing the seal labyrinth teeth in Step 4 is as follows: Design a turning numerical control machining program according to the tooth profile data of the seal labyrinth teeth after rough machining, and use the contour machining tool to perform layer-by-layer cutting on the seal labyrinth teeth according to the numerical control machining program.

[0012] Preferably, the surplus on the tooth side and the bottom of the groove is 0.15 mm.

[0013] Preferably, during the layer-by-layer cutting process, the wear amount of the cutting edge is less than 0.2 mm.

[0014] Preferably, the method of using a new contour machining tool and combining it with a numerical control machining program to remove the surplus in Step 5 is as follows: Spindle speed 28 m / min, feed rate 0.08 mm / r, cutting depth 0.15 mm.

[0015] Compared with the prior art, the present invention has the following beneficial technical effects: A turning control method for a sealing labyrinth tooth of the present application uses a side tool to turn the outer diameter of the sealing tooth, and cools the tip of the side tool with a coolant during the machining process. The side tool can efficiently remove most of the outer diameter allowance of the sealing tooth, and its unique cutting angle and shape can quickly cut the material, reducing the machining time. A forming tool is designed according to the tooth profile data of the sealing labyrinth tooth, and this tool is used for rough machining. The forming tool can accurately match the tooth profile of the sealing labyrinth tooth, removing most of the allowance at one time, greatly reducing the number of machining times. Compared with the traditional machining method, using the forming tool can avoid the process of changing tools and adjusting tool parameters multiple times, saving time and improving machining efficiency. Moreover, since the forming tool is specially designed according to the tooth profile data, its cutting process is smoother, which can reduce the cutting resistance caused by the mismatch between the tool and the workpiece, further accelerating the machining speed. Secondly, a contour machining tool is used to finish machine the sealing labyrinth tooth, removing the allowance on the tooth side and the bottom of the groove, and leaving a certain allowance on the tooth side and the bottom of the groove. This machining method can accurately control the cutting force during the machining process, avoiding stress concentration caused by over-cutting. Keeping a certain allowance can be fine-tuned in subsequent machining to further reduce stress. At the same time, the finishing process can improve the surface quality of the workpiece, reduce surface defects, creating favorable conditions for suppressing the generation of white layer. Finally, a new contour machining tool is used in combination with a numerical control machining program to remove the allowance, completing the machining of the sealing labyrinth tooth. The new contour machining tool ensures the sharpness and accuracy of the tool, and can more accurately remove the allowance. The numerical control machining program can accurately control the movement trajectory and cutting parameters of the tool, realizing uniform cutting and avoiding stress concentration caused by uneven cutting force. By precisely controlling the machining process, the generation of white layer can be effectively suppressed, improving the surface integrity and fatigue performance of the sealing labyrinth tooth.

[0016] In summary, through reasonable step arrangement and process design, the turning control method for the sealing labyrinth tooth improves the machining efficiency while effectively reducing stress and suppressing the generation of white layer, providing a reliable method for high-quality machining of the sealing labyrinth tooth. Brief Description of the Drawings

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.

[0018] Figure 1 Schematic diagram of the structure of the sealing tooth of the present invention; Figure 2 Schematic diagram of the adjusted position of the coolant outlet of the present invention. Detailed Embodiments

[0019] To make the objectives, technical solutions and advantages of the embodiments of this application clearer, the following will clearly and completely describe the technical solutions in the embodiments of this application with reference to the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are some, but not all, of the embodiments of this application. Generally, the components of the embodiments of this application described and illustrated in the accompanying drawings here can be arranged and designed in various different configurations.

[0020] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of this application claimed, but merely represents selected embodiments of this application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in this application without creative efforts fall within the scope of protection of this application.

[0021] A turning control method for a sealing labyrinth includes the following steps: Step 1: Determine the profile machining tool according to the structure of the sealing labyrinth.

[0022] Obtain the tooth profile data of the sealing labyrinth and customize the profile machining tool according to the tooth profile data.

[0023] Optionally, obtain the tooth profile data according to the design drawing of the sealing labyrinth, and then design the profile machining tool, and send the design drawing of the profile machining tool to the tool manufacturer for customization of the profile machining tool.

[0024] It is also possible to obtain the tooth profile data by measurement. For example, use a coordinate measuring machine to measure the tooth profile data of the sealing labyrinth, and then design the profile machining tool.

[0025] This profile machining tool is used for finish machining the sealing labyrinth, and the fillet of this profile machining tool is at least 0.1 mm smaller than the fillet of the sealing labyrinth.

[0026] Obtaining the tooth profile data of the sealing labyrinth and customizing the profile machining tool can ensure the precise matching of the tool with the tooth profile of the sealing labyrinth, improve the machining accuracy, and reduce the machining errors and surface defects caused by inappropriate tools. Secondly, the fillet of the customized tool is at least 0.1 mm smaller than the fillet of the sealing labyrinth, which can better fit the profile of the sealing labyrinth during the finish machining process, effectively avoiding over-cutting or under-machining of the key parts of the tooth profile during the machining process, and helping to improve the surface quality and dimensional accuracy of the sealing labyrinth.

[0027] Step 2: Install the turbine disk on the turning equipment, and perform clamping and alignment to complete the installation of the turbine disk.

[0028] The turning equipment is a numerically controlled lathe. Preferably, it is a numerically controlled lathe with a cooling pressure of 8 - 10 bar.

[0029] Properly install the turbine disk on the turning equipment and clamp and align it, which can ensure that the turbine disk maintains a stable position during the machining process, avoid problems such as vibration and deviation caused by improper clamping, thereby improving the machining stability and reducing machining errors. The turning equipment selects a CNC lathe, and preferably a CNC lathe with a cooling pressure of 8 - 10 bar. The appropriate equipment can be flexibly selected according to the actual production conditions and requirements. At the same time, the CNC lathe with high cooling pressure helps to better dissipate heat during the machining process and reduce problems such as white layer caused by high temperature.

[0030] Step 3: Install a parting tool on the turning equipment and adjust the angle of the coolant so that the included angle between the spraying angle of the coolant and the cutting surface of the tool is 45°, and the distance between the coolant outlet and the cutting edge of the tool is 100 - 200 mm.

[0031] Adjust the nozzle angle of the coolant so that the included angle between the spraying angle of the coolant and the cutting surface of the tool is 45°, and the distance between the coolant outlet and the cutting edge of the tool is 100 - 200 mm, which can make the coolant spray more accurately into the cutting area, effectively reduce the cutting temperature, reduce the white layer phenomenon caused by high temperature, and at the same time help to wash away the chips and avoid the chips scratching the machined surface; at the same time, good cooling conditions can reduce the wear rate of the tool, extend the service life of the tool, reduce the machining quality problems and tool change times caused by tool wear, and improve the machining efficiency.

[0032] Step 4: Use a parting tool to turn the outer diameter of the seal teeth. Using a parting tool to turn the outer diameter of the seal teeth in the preliminary forming can quickly remove most of the surplus, make the seal teeth preliminarily formed, provide a good foundation for subsequent rough machining and finish machining, and improve the overall machining efficiency. Secondly, parting tool turning can better control the dimensional accuracy of the outer diameter and ensure that the basic shape and dimensions of the seal teeth meet the design requirements.

[0033] Step 5: Design a forming tool according to the tooth profile data of the seal labyrinth teeth, and use the forming tool to rough machine the seal labyrinth teeth to remove the surplus of the seal teeth. At least 0.2 mm of allowance should be left on each side of the tooth side, and the wear amount of the cutting edge of the tool should be controlled not to exceed 0.2 mm.

[0034] The forming tool is a profiling tool. Using a profiling tool to rough machine the seal labyrinth teeth can remove most of the surplus of the seal labyrinth teeth to improve the machining efficiency of the seal labyrinth teeth.

[0035] Rough machining of the sealing labyrinth teeth with a forming tool (copying tool) can remove most of the surplus of the sealing teeth at one time, greatly improving the machining efficiency and shortening the machining time. At the same time, control the unilateral allowance on the tooth side to be at least 0.2 mm, and control the wear of the cutting edge of the tool to be no more than 0.2 mm, which can ensure the uniform allowance of each part of the sealing labyrinth teeth after rough machining, provide stable machining conditions for subsequent finish machining, and avoid machining quality problems caused by uneven allowance.

[0036] Step 6: Finish machine the sealing labyrinth teeth with a contour machining tool to remove the surplus on the tooth side and the bottom of the groove of the sealing labyrinth teeth, and leave a certain allowance on the tooth side and the bottom of the groove.

[0037] Specifically, design a turning numerical control machining program according to the tooth profile data of the sealing labyrinth teeth after rough machining, and use a contour machining tool to perform layer-by-layer cutting on the sealing labyrinth teeth according to the numerical control machining program to reduce the stress during the machining process and simultaneously suppress the generation of the white layer.

[0038] During the turning process, evenly remove the allowance of the sealing teeth until the tooth side and the bottom of the groove are both 0.15 mm, and control the wear of the cutting edge of the tool to be no more than 0.2 mm.

[0039] Design a turning numerical control machining program according to the tooth profile data of the sealing labyrinth teeth after rough machining, and perform layer-by-layer cutting with a contour machining tool, which can disperse the stress during the machining process, reduce the risk of crack initiation caused by stress concentration, and at the same time help to suppress the generation of the white layer. During the turning process, evenly remove the allowance of the sealing teeth until the tooth side and the bottom of the groove are both 0.15 mm, and control the wear of the cutting edge of the tool to be no more than 0.2 mm, which can accurately control the size and shape of the sealing labyrinth teeth, improve the surface quality, and reduce surface defects.

[0040] Step 7: Use a new contour machining tool and combine it with a numerical control machining program to remove the allowance and complete the machining of the sealing labyrinth teeth.

[0041] Specifically, evenly remove the reserved 0.15 mm allowance from both sides of the tooth with an unused contour blade, and the cutting parameters are: spindle speed 28 m / min, feed rate 0.08 mm / r, cutting depth 0.15 mm; Evenly removing the reserved 0.15 mm allowance from both sides of the tooth with an unused contour blade can ensure further improvement of the machining accuracy and avoid machining errors caused by tool wear. Using specific cutting parameters (spindle speed 28 m / min, feed rate 0.08 mm / r, cutting depth 0.15 mm) can better control the cutting force and cutting temperature during the machining process while ensuring the machining efficiency, reduce the generation of the white layer, and improve the machining quality.

[0042] Step 8: After completion, perform metallographic inspection on the surface to ensure that the white layer on the part surface meets the surface integrity standard requirements (less than 0.001 mm), and obtain a disk that can meet the white layer requirements of small-sized sealing teeth.

[0043] It should be noted that metallographic inspection is a destructive inspection method. Therefore, in this application, metallographic inspection is only performed on the first piece or test piece, and no metallographic inspection is performed on the parts during batch processing, or metallographic inspection is performed by sampling.

[0044] Perform metallographic inspection on the processed surface to ensure that the white layer on the part surface meets the surface integrity standard requirements (less than 0.001 mm), which can timely detect possible problems during the processing, such as excessive white layer, etc., ensure that the processing quality of the sealing labyrinth teeth meets the design requirements, and avoid fatigue performance problems such as cracks caused by white layer problems.

[0045] As an effective quality inspection method, metallographic inspection provides reliable quality guarantee for the subsequent use of the sealing labyrinth teeth, ensuring that they can work normally under high temperature and harsh working conditions.

[0046] Step 9: Perform batch processing of the sealing labyrinth teeth according to the above processing data.

[0047] Performing batch processing of the sealing labyrinth teeth according to the above verified processing data can ensure that the processing process and quality of each sealing labyrinth tooth are consistent, improving the overall quality and stability of the product.

[0048] Improve production efficiency: Batch processing can achieve large-scale and standardized production, reduce the adjustment time and cost caused by single processing, improve production efficiency, and meet production requirements.

[0049] In order to suppress the formation of white layer during the processing, the processing method of this application effectively solves the white layer problem and improves the processing quality and fatigue performance of the sealing labyrinth teeth through optimization and improvement in aspects such as tool design and selection, processing process control, cooling measures, and quality inspection, as follows: 1. Customize the profile machining tool Customize the profile machining tool according to the tooth profile data of the sealing labyrinth teeth, and the fillet of this tool is at least 0.1 mm smaller than the fillet of the sealing labyrinth teeth. This precisely adapted tool design can better fit the profile of the sealing labyrinth teeth during the finish machining process, reduce the severe plastic deformation during processing, and fundamentally reduce the possibility of white layer generation. Because of the good matching between the tool and the workpiece, the cutting force distribution is more uniform, avoiding the generation of white layer caused by local stress concentration.

[0050] Using a form tool (copying tool) in the rough machining stage can efficiently remove most of the surplus material and reduce the stress accumulation caused by multiple cuttings and complex machining processes. The design of the form tool is also based on the tooth profile data of the sealing labyrinth teeth, ensuring the stability and accuracy of the machining process and helping to control the formation of the white layer.

[0051] 2. In terms of machining process control Reducing stress by layer-by-layer cutting: In the finish machining process, a turning CNC machining program is designed according to the tooth profile data after rough machining of the sealing labyrinth teeth, and a contour machining tool is used for layer-by-layer cutting. This method disperses the stress in the machining process, avoids stress concentration caused by a large amount of cutting at one time, and effectively inhibits the generation of the white layer. Layer-by-layer cutting enables the material to gradually adapt to deformation during machining, reducing the probability of generating a white layer due to severe plastic deformation.

[0052] Precisely controlling the machining allowance: The machining allowance is precisely controlled in both the rough machining and finish machining stages. At least 0.2 mm of allowance is left on each side of the tooth flank during rough machining, and the allowance of the sealing teeth is evenly removed to 0.15 mm on both the tooth flank and the bottom of the groove during finish machining. This precise allowance control ensures the stability and consistency of the machining process, avoids fluctuations in cutting force caused by uneven allowance, and thus reduces the generation of the white layer.

[0053] Optimizing cutting parameters: In the final process of removing the allowance, specific cutting parameters are adopted (spindle speed 28 m / min, feed rate 0.08 mm / r, cutting depth 0.15 mm). These parameters are selected through optimization, which can reduce the cutting force and cutting temperature while ensuring machining efficiency, and reduce the white layer phenomenon caused by high temperature and severe friction. Appropriate cutting parameters help to maintain the stability of the machining process and improve the machining quality.

[0054] 3. Cooling measures Adjusting the angle and distance of the coolant: When installing a side tool, adjust the angle of the coolant so that the included angle between the spraying angle of the coolant and the cutting surface of the tool is 45°, and the distance between the coolant outlet and the cutting edge of the tool is 100 - 200 mm. This cooling method can make the coolant spray more precisely onto the cutting area, effectively reduce the cutting temperature, and reduce the white layer phenomenon caused by high temperature. Good cooling conditions can take away a large amount of heat generated during cutting, avoid phase transformation and microstructure changes of the material due to overheating, and thus inhibit the generation of the white layer.

[0055] 4. In terms of quality inspection Metallographic inspection ensures quality: After machining is completed, the surface is subjected to metallographic inspection to ensure that the white layer on the part surface meets the surface integrity standard requirements (less than 0.001 mm). Through strict quality inspection, problems that may exist during the machining process, such as excessive white layer, can be detected in a timely manner, and corresponding measures can be taken for adjustment and improvement. This quality inspection mechanism ensures that the machining quality of the seal labyrinth teeth meets the design requirements, effectively solving the white layer problem mentioned in the background technology.

[0056] Embodiment 1 Taking a turbine disk part as an example, a turning control method for a seal labyrinth tooth of the present application will be described in detail below.

[0057] This embodiment is for machining a turbine disk part with 4 small-sized seal teeth. The outer diameter of this part is Ф469 mm, the axial thickness is 73 mm, the outer diameter of the seal teeth is Ф318.97 mm, which is located in an end face groove with a width of about 22.5. The tooth height is only 2.55 mm, the tooth width is 2.19 mm, the tooth bottom fillet is R0.64 mm, and the tooth side angle is 20°. It is not easy to cool and observe during machining. The part structure is as shown in the appendix Figure 1 shown. After machining with a traditional forming tool, the crack rate of the 2nd and 3rd seal teeth reached up to 46% after the first test run of the part. Therefore, the method proposed in the present application is adopted. Before machining with the present application, the end face groove at the seal teeth of the part has been turned and formed.

[0058] Step 1: Use a CNC lathe with a cooling pressure of 8 - 10 bar, and adjust the position of the coolant outlet and the tool tip. Refer to Figure 2 .

[0059] Step 2: Use an R0.4 side tool to machine the outer diameters of the 4 seal teeth in 2 layers, leaving a unilateral allowance of 0.15 mm, including the upper side of tooth 1, as shown in process step 1 of Appendix 1. Step 3: Use an R0.4 side tool to machine the outer diameters of the 4 seal teeth in 1 layer to the size. The machining tool and machining parameters can be seen in process step 2 of Table 1.

[0060] The tool shank is MVJNL2525M164R0.4, and the insert: VNGP160404K (1 cutting edge).

[0061] Cutting speed: 30 m / min, feed rate: 0.12 mm / r, cutting depth: 0.15 mm.

[0062] Step 4: Use an R0.64 forming tool to remove 1.3 mm of allowance from the 4 seal teeth in 3 tool passes. The tooth side allowance is 0.2 mm, and the tooth bottom allowance is 1.23. The machining tool and machining parameters can be seen in process step 3 of Table 1.

[0063] Tool shank: CEAL2525M14 - MOD304R0.64, Insert: 14ER - S37038 - A (2 cutting edges).

[0064] Cutting speed: 28 m / min, Feed rate: 0.08 mm / r, Depth of cut: 0.65 mm (in the x - direction). Replace the cutting edge between two depths of cut.

[0065] Step 5: Use a tool with a R0.6 profile to remove 0.85 mm of stock from the 4 sealing teeth in 3 passes. The stock on the side of the teeth is 0.2 mm, and the stock at the bottom of the teeth is 0.38 mm. The machining tool and machining parameters refer to Process 4 in Table 1.

[0066] Tool shank: WGL3225P06 - T15404R0.6, Insert: WG - RO.6 - T15404 (1 cutting edge).

[0067] Cutting speed: 28 m / min, Feed rate: 0.08 mm / r, Depth of cut: 0.425 mm (in the X - direction). Clean the chips between two depths of cut.

[0068] Step 6: Use a tool with a R0.6 profile to machine the bottom and lower sides of the 4 sealing teeth to a stock of 0.15 mm. The machining tool and machining parameters refer to Process 5 in Table 1.

[0069] Tool shank: WGL3225P06 - T1540R0.6, Insert: WG - RO.6 - T15404 (0.5 cutting edges).

[0070] Cutting speed: 28 m / min, Feed rate: 0.08 mm / r, Depth of cut: 0.05 - 0.23 mm.

[0071] Step 7: Use a tool with a R0.6 profile to machine the upper sides of the 4 sealing teeth to a stock of 0.15 mm. The machining tool and machining parameters refer to Process 6 in Table 1.

[0072] Tool shank: WGL3225P06 - T15404R0.6, Insert: WG - R0.6 - T15404 (0.5 cutting edges).

[0073] Cutting speed: 28 m / / min, Feed rate: 0.08 mm / r, Depth of cut: 0.05 mm.

[0074] Step 8: Use a tool with a R0.6 profile to machine the lower sides of Teeth 2 and 3 to the required dimensions. The machining tool and machining parameters refer to Process 7 in Table 1.

[0075] Tool shank: WGL3225P06 - T15404R0.6, Insert: WG - R0.6 - T15404 (0.5 cutting edges).

[0076] Cutting speed: 28 m / min, feed rate: 0.08 mm / r, cutting depth: 0.15 mm.

[0077] Step 9: Use a contour tool with R0.6 to machine the upper sides of teeth 2 and 3 to the required dimensions. The machining tool and parameters can be referred to in Process 8 of Table 1.

[0078] Tool shank: WGL3225P06-T15404R0.6, insert: WG-R0.6-T15404 (0.5 cutting edges).

[0079] Cutting speed: 28 m / min, feed rate: 0.08 mm / r, cutting depth: 0.15 mm.

[0080] Step 10: Use a contour tool with R0.6 to machine the lower sides of teeth 1 and 4 to the required dimensions. The machining tool and parameters can be referred to in Process 9 of Table 1. Tool shank: WGL3225P06-T1540R0.6, insert: WG-RO.6-T15404 (0.5 cutting edges).

[0081] Cutting speed: 28 m / min, feed rate: 0.08 mm / r, cutting depth: 0.15 mm.

[0082] Step 11: Use a contour tool with R0.6 to machine the upper side of tooth 4 to the required dimensions. The machining tool and parameters can be referred to in Process 10 of Table 1. Tool shank: WGL3225P06-T1540-R0.6, insert: WG-R0.6-T15404 (0.5 cutting edges).

[0083] Cutting speed: 28 m / min, feed rate: 0.08 mm / r, cutting depth: 0.15 mm.

[0084]

[0085]

[0086] The turning machining control method of the present application. The present invention can solve the problem of controlling the machining surface of the small-sized sealing teeth of disk-shaped parts, and is applicable to engines with harsh working conditions for disk sealing teeth and high requirements for surface quality. It can be widely used in the machining of high-quality surfaces of small sealing teeth of disk-shaped parts with similar structures in various fields.

[0087] The above content is only to illustrate the technical idea of the present invention, and the protection scope of the present invention cannot be limited thereby. Any modification made on the basis of the technical solution according to the technical idea proposed by the present invention falls within the protection scope of the claims of the present invention.

Claims

1. A turning control method for sealing comb teeth, characterized in that: The following steps are involved: Step 1: Install the turbine disc on the turning equipment and perform clamping and alignment; Step 2, using an offset tool to turn the outer diameter of the sealing tooth, and using a coolant to cool the tip of the tool during the machining process; Step 3, designing a forming tool according to the tooth shape data of the sealing grate teeth, and using the forming tool to perform rough processing on the sealing grate teeth; Step 4: Use a contour machining tool to perform fine machining on the sealing grate teeth, remove the excess on the tooth side and groove bottom of the sealing grate teeth, and retain a certain amount of excess on the tooth side and groove bottom; Step 5: Use a new contour machining tool and combine it with the CNC machining program to remove the excess and complete the machining of the sealing comb teeth.

2. A method for controlling the turning of sealing comb teeth according to claim 1, characterized in that: The method of using coolant to cool the tip of the deflected knife is as follows: The coolant spray angle is 45° to the tool cutting surface, and the distance between the coolant outlet and the tool cutting edge is 100-200mm.

3. A method for controlling the turning of sealing comb teeth according to claim 1, characterized in that: In step 3, a forming tool is used to perform rough processing on the sealing comb teeth, and the excess on one side of the comb teeth is greater than 0.2 mm.

4. A method for controlling the turning of sealing comb teeth according to claim 1, characterized in that: Step 3: During the rough machining of the sealing comb teeth, the wear of the tool cutting edge is less than 0.2 mm.

5. A method for controlling the turning of sealing comb teeth according to claim 1, characterized in that: The contour processing tool described in step 4 is a customized tool, which is customized according to the tooth shape data of the sealing comb teeth.

6. A method for controlling the turning of sealing comb teeth according to claim 5, characterized in that: The fillet of the contour machining tool is smaller than the fillet of the sealing comb teeth.

7. A method for controlling the turning of sealing comb teeth according to claim 1, characterized in that: The finishing method of the sealing grate teeth described in step 4 is as follows: The turning NC machining program is designed according to the tooth shape data of the sealing grate teeth after rough machining, and the sealing grate teeth are cut in layers using a contour machining tool according to the NC machining program.

8. A method for controlling the turning of sealing comb teeth according to claim 7, characterized in that: The margins of the tooth sides and the groove bottom are 0.15 mm.

9. A method for controlling the turning of sealing comb teeth according to claim 7, characterized in that: During the layered cutting process, the cutting edge wear is less than 0.2 mm.

10. A method for controlling the turning of sealing comb teeth according to claim 1, characterized in that: Step 5: The method of removing the excess using a new contour machining tool and combining it with the CNC machining program is as follows: The spindle speed is 28m / min, the feed rate is 0.08mm / r, and the cutting depth is 0.15mm.

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