Machining method for shroud strip molded line of large-size precision casting high-temperature alloy blade

Abstract

The invention discloses a machining method for a shroud ring molded line of a large-size precision casting high-temperature alloy blade, and relates to the technical field of machining of large-size precision casting high-temperature alloy blades. In order to solve the problems that in the prior art, a diamond roller grinding wheel is usually selected for blade machining, the machining cost is high due to the fact that a diamond roller with a molded line is high in manufacturing cost, and the machining efficiency is low due to the fact that the machining time of one blade is long. After the disc grinding wheel is used on the five-axis grinding machine, the blade shroud strip molded line is machined, a diamond roller grinding wheel is not needed, the machining cost is reduced, and remarkable technical advantages and application value are achieved. Before the five-axis grinding machine is used for machining the high-temperature alloy precision casting large blade, grinding parameters are adjusted according to working conditions, and before the grinding machine is started for machining, the machining track of the blade can be simulated, so that the machining time is effectively controlled, and the working efficiency is improved. The method is suitable for grinding the cast high-temperature alloy blade.

Description

Technical Field

[0001] The invention relates to the technical field of processing large-size precision cast high-temperature alloy blades, and in particular to a method for processing a shroud profile of a large-size precision cast high-temperature alloy blade. Background Art

[0002] A nickel-based high-temperature alloy precision-cast blade has a total length of 840mm, a steam channel length of 710mm, a thin steam channel, a small chord width, a V-shaped belt with a toothed air seal, and its processing accuracy has strict requirements on the assembly surface size and form and position tolerances. In the prior art, the belt processing of this type of blade is usually carried out by using a diamond roller to grind the grinding wheel and the grinding wheel to grind the workpiece. However, the cost of the diamond roller with a profile is very high, and the manufacturing cycle ranges from 6 to 8 months. In addition, for test pieces with a small number of processing and a tight cycle, the cost-effectiveness of using diamond rollers is extremely low.

[0003] In summary, the existing blade processing usually first uses a diamond roller grinding wheel. Since the diamond roller with a profile line is very expensive, the processing cost is high, and the processing time for a blade is long, which leads to low processing efficiency. Summary of the invention

[0004] The present invention aims to solve the problem that in the prior art blade processing, a diamond roller is usually used to grind a grinding wheel first. Since the diamond roller with a profile line is very expensive, the processing cost is high, and the processing time for a blade is long, which leads to low processing efficiency. A method for processing the profile line of a large-size precision cast high-temperature alloy blade is proposed.

[0005] A processing method for a large-size precision cast high-temperature alloy blade shroud profile of the present invention is as follows:

[0006] Step 1: First, select the appropriate grinding wheel according to the material and size of the blade; then select the appropriate disc according to the material and size of the grinding wheel. The particle size and hardness of the disc should match the grinding wheel;

[0007] Step 2: Through specific installation and adjustment, the disc and the grinding wheel are precisely matched, and precise grinding is performed on the five-axis creep-feed grinder. The disc is used to precisely grind the grinding wheel on the five-axis creep-feed grinder to give it a specific shape and precision;

[0008] Step 3, using the grinding wheel to grind the blade shroud profile;

[0009] Step 4: Adjust the grinding parameters of the five-axis grinder;

[0010] Step 5: Edit and debug the machining program of the five-axis grinder;

[0011] Step 6: Start the five-axis grinder to grind the blade;

[0012] Furthermore, in step 4, the grinding parameters of the five-axis grinder are adjusted, the spindle speed is 2104 rpm, and the feed rate is 120 mm / min;

[0013] Furthermore, the specific process of editing the machining program of the five-axis grinder in step 5 is as follows:

[0014] Step 51: Use CAD software to draw the blade model. During the programming process, the motion trajectory, feed speed and cutting depth of the disc and grinding wheel need to be determined according to the CAD model of the blade and the processing requirements;

[0015] Step 52: Determine the center coordinates: During the grinding process, the center coordinates of the disc and the grinding wheel need to be determined. First, determine the center coordinates of the shroud profile on the CAD model of the blade; then calculate their center coordinates based on the size and shape of the disc and the grinding wheel; finally, input the calculated center coordinates into the control system of the grinder to achieve precise movement of the disc and the grinding wheel;

[0016] Furthermore, the specific method of drawing the blade model in step 51 and determining the processing parameters during programming is as follows:

[0017] Step 5: Draw the graphics of the workpiece surface to be processed using CAD, including the inner back line of the blade shroud and the blade tip air seal;

[0018] Step 512: Use the disc-specific software WinWOP to open the CAD file of the rear blade;

[0019] Step 513: Set the grinding wheel parameters, the grinding wheel diameter is 1.03mm;

[0020] Step 514: Automatically generate the grinding trajectory. If the trajectory cannot be generated, modify the CAD to adjust the angle;

[0021] Step 515: trajectory simulation, including initial trimming simulation and contour simulation;

[0022] Step 516: Post-processing to generate a NC program for the machine tool;

[0023] Furthermore, the specific steps of starting the five-axis grinder to grind the blade in step 6 are as follows:

[0024] Step 61: Start the five-axis grinder and let the disc grind the grinding wheel; during the grinding process, the position and state of the grinding wheel are monitored in real time through the sensor to ensure that the shape and size of the grinding wheel meet the requirements;

[0025] Step 62: Grind the blade shroud profile: After the grinding is completed, start the grinder and let the grinding wheel grind the blade shroud profile; during the grinding process, the position and status of the blade are monitored in real time through sensors to ensure processing accuracy and quality.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] The present invention overcomes the shortcomings of the prior art. After using a disc to grind the grinding wheel on a five-axis grinder, the blade shroud profile is processed without using a diamond roller to grind the grinding wheel, which reduces the processing cost and has significant technical advantages and application value. Before using a five-axis grinder to process a high-temperature alloy precision-cast large blade, the grinding parameters are adjusted according to the working conditions, and before the grinder starts processing, the processing trajectory of the blade can be simulated, thereby effectively controlling the processing time, shortening the processing cycle of spare parts, and obtaining a lower grinding cost, thereby improving the grinding efficiency for such a high-temperature alloy precision-cast large blade, and improving work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 is a front view of the high temperature alloy blade of the present invention;

[0029] Figure 2 It is the adjustment interface of the grinding parameters of the five-axis grinder of the present invention;

[0030] Figure 3 is a side view of the high temperature alloy blade of the present invention;

[0031] Figure 4 is a side sectional view of the high temperature alloy blade of the present invention;

[0032] Figure 5 A method for processing the shroud profile of a large-size precision cast high-temperature alloy blade according to the present invention uses CAD to draw a processing route map of the blade;

[0033] Figure 6 It is a cross section of automatically generating a grinding track in a method for processing a shroud profile of a large-size precision cast high-temperature alloy blade according to the present invention;

[0034] Figure 7 It is a cross section of trajectory simulation in a method for processing the shroud profile of a large-size precision cast high-temperature alloy blade according to the present invention;

[0035] Figure 8 The present invention discloses a table for setting relevant processing parameters in a method for processing a large-size precision cast high-temperature alloy blade shroud profile. DETAILED DESCRIPTION

[0036] Specific implementation method 1: Combination Figures 1 to 8 This embodiment describes a method for processing a large-size precision casting high-temperature alloy blade shroud profile, and its specific processing method is as follows:

[0037] Step 1: First, select the appropriate grinding wheel according to the material and size of the blade; then select the appropriate disc according to the material and size of the grinding wheel. The particle size and hardness of the disc should match the grinding wheel;

[0038] Step 2: Through specific installation and adjustment, the disc and the grinding wheel are precisely matched, and precise grinding is performed on the five-axis creep-feed grinder. The disc is used to precisely grind the grinding wheel on the five-axis creep-feed grinder to give it a specific shape and precision;

[0039] Step 3, using the grinding wheel to grind the blade shroud profile;

[0040] Step 4: Adjust the grinding parameters of the five-axis grinder;

[0041] Step 5: Edit and debug the machining program of the five-axis grinder;

[0042] Step 6: Start the five-axis grinder to grind the blade;

[0043] In this specific implementation, after using a disc to grind the grinding wheel on a five-axis grinder, there is no need to use a diamond roller to grind the grinding wheel when processing the blade shroud profile, which reduces the processing cost and has significant technical advantages and application value. Before using a five-axis grinder to process large high-temperature alloy precision-cast blades, the grinding parameters are adjusted according to the working conditions, and before the grinder starts processing, the processing trajectory of the blade can be simulated, thereby effectively controlling the processing time, shortening the processing cycle of spare parts, and obtaining a lower grinding cost, thereby improving the grinding efficiency for such large high-temperature alloy precision-cast blades, and improving work efficiency; wherein the method described in step one can ensure the grinding effect of the grinding wheel and the service life of the grinding wheel.

[0044] Specific implementation method 2: Combination Figures 1 to 8 To explain this embodiment, this embodiment is a further limitation of the processing method described in the specific embodiment one. This embodiment describes a processing method for a large-size precision cast high-temperature alloy blade band profile. In the step four, the grinding parameters of the five-axis grinder are adjusted, the spindle speed is 2104rpm, and the feed rate is 120mm / min.

[0045] Specific implementation method three: Combination Figures 1 to 8This embodiment is described. This embodiment is a further limitation of the processing method described in the specific embodiment 1. The processing method of a large-size precision casting high-temperature alloy blade shroud profile described in this embodiment, the specific process of editing the processing program of the five-axis grinder in the step 5 is as follows:

[0046] Step 51: Use CAD software to draw the blade model. During the programming process, the motion trajectory, feed speed and cutting depth of the disc and grinding wheel need to be determined according to the CAD model of the blade and the processing requirements;

[0047] Step 52: Determine the center coordinates: During the grinding process, the center coordinates of the disc and the grinding wheel need to be determined. First, determine the center coordinates of the shroud profile on the CAD model of the blade; then calculate the center coordinates of the disc and the grinding wheel based on their size and shape; finally, input the calculated center coordinates into the control system of the grinder to achieve precise movement of the disc and the grinding wheel.

[0048] Specific implementation method four: Combination Figures 1 to 8 This embodiment is described. This embodiment is a further limitation of the processing method described in the third embodiment. The processing method of a large-size precision casting high-temperature alloy blade shroud profile described in this embodiment, the specific method of drawing the blade model in the step 51 and determining the processing parameters in the programming process is as follows:

[0049] Step 5: Draw the graphics of the workpiece surface to be processed using CAD, including the inner back line of the blade shroud and the blade tip air seal;

[0050] Step 512: Use the disc-specific software WinWOP to open the CAD file of the rear blade;

[0051] Step 513: Set the grinding wheel parameters, the grinding wheel diameter is 1.03mm;

[0052] Step 514: Automatically generate the grinding trajectory. If the trajectory cannot be generated, modify the CAD to adjust the angle;

[0053] Step 515: trajectory simulation, including initial trimming simulation and contour simulation;

[0054] Step 516: Post-processing to generate CNC program for machine tools.

[0055] Specific implementation method five: Combination Figures 1 to 8 This embodiment is described. This embodiment is a further limitation of the processing method described in the specific embodiment 1. The processing method of the shroud profile of a large-size precision cast high-temperature alloy blade described in this embodiment, the specific steps of starting the five-axis grinder to grind the blade in step 6 are as follows:

[0056] Step 61: Start the five-axis grinder and let the disc grind the grinding wheel; during the grinding process, the position and state of the grinding wheel are monitored in real time through the sensor to ensure that the shape and size of the grinding wheel meet the requirements;

[0057] Step 62: Grind the blade shroud profile: After the grinding is completed, start the grinder and let the grinding wheel grind the blade shroud profile; during the grinding process, the position and status of the blade are monitored in real time through sensors to ensure processing accuracy and quality.

Claims

1. A method for processing the shroud profile of a large-size precision cast high-temperature alloy blade, characterized in that: The specific processing method is as follows: Step 1: First, select the appropriate grinding wheel according to the material and size of the blade; then select the appropriate disc according to the material and size of the grinding wheel. The particle size and hardness of the disc should match the grinding wheel; Step 2: Through specific installation and adjustment, the disc and the grinding wheel are precisely matched, and precise grinding is performed on the five-axis creep-feed grinder. The disc is used to precisely grind the grinding wheel on the five-axis creep-feed grinder to give it a specific shape and precision; Step 3, using the grinding wheel to grind the blade shroud profile; Step 4: Adjust the grinding parameters of the five-axis grinder; Step 5: Edit and debug the machining program of the five-axis grinder; Step 6: Start the five-axis grinder to grind the blades.

2. The method for processing the shroud profile of a large-size precision cast high-temperature alloy blade according to claim 1, characterized in that: In the step 4, the grinding parameters of the five-axis grinder are adjusted, the spindle speed is 2104 rpm, and the feed rate is 120 mm / min.

3. The method for processing the shroud profile of a large-size precision cast high-temperature alloy blade according to claim 1, characterized in that: The specific process of editing the machining program of the five-axis grinder in step 5 is as follows: Step 51: Use CAD software to draw the blade model. During the programming process, the motion trajectory, feed speed and cutting depth of the disc and grinding wheel need to be determined according to the CAD model of the blade and the processing requirements; Step 52: Determine the center coordinates: During the grinding process, the center coordinates of the disc and the grinding wheel need to be determined. First, determine the center coordinates of the shroud profile on the CAD model of the blade; then calculate the center coordinates of the disc and the grinding wheel based on their size and shape; finally, input the calculated center coordinates into the control system of the grinder to achieve precise movement of the disc and the grinding wheel.

4. The method for processing the shroud profile of a large-size precision cast high-temperature alloy blade according to claim 3, characterized in that: The specific method of drawing the blade model in step 51 and determining the processing parameters during programming is as follows: Step 5: Draw the graphics of the workpiece surface to be processed using CAD, including the inner back line of the blade shroud and the blade tip air seal; Step 512: Use the disc-specific software WinWOP to open the CAD file of the rear blade; Step 513: Set the grinding wheel parameters, the grinding wheel diameter is 1.03mm; Step 514: Automatically generate the grinding trajectory. If the trajectory cannot be generated, modify the CAD to adjust the angle; Step 515: trajectory simulation, including initial trimming simulation and contour simulation; Step 516: Post-processing to generate CNC program for machine tools.

5. The method for processing the shroud profile of a large-size precision cast high-temperature alloy blade according to claim 1, characterized in that: The specific steps of starting the five-axis grinder to grind the blade in step 6 are as follows: Step 61: Start the five-axis grinder and let the disc grind the grinding wheel; during the grinding process, the position and state of the grinding wheel are monitored in real time through the sensor to ensure that the shape and size of the grinding wheel meet the requirements; Step 62: Grind the blade shroud profile: After the grinding is completed, start the grinder and let the grinding wheel grind the blade shroud profile; during the grinding process, the position and status of the blade are monitored in real time through sensors to ensure processing accuracy and quality.

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