A machining method for a high-temperature alloy turbine casing annular narrow round-bottom groove

Abstract

The application provides a processing method for a high-temperature alloy turbine casing annular narrow circular bottom groove, and belongs to the technical field of machining. The processing method comprises the following steps: a straight groove area is coarsely processed by using a groove cutting tool to start from a designed position of a part to obtain an initial straight groove area; a ball cutter is used to cut from a groove opening of the initial straight groove area to a groove bottom of the initial straight groove area, and then the coarse processing of a circular arc groove bottom area is started to obtain an initial circular arc groove bottom area; the ball cutter is used to retreat and advance along the depth direction of the narrow circular bottom groove when the ball cutter with a radius processes the initial circular arc groove bottom area; and the ball cutter is used to start from the groove opening of the initial straight groove area to finely process the initial straight groove area and the initial circular arc groove bottom area, so that the final narrow circular bottom groove is obtained. The radius of the ball cutter can effectively control the processing size and surface quality of the groove, and the processing quality of the annular groove is improved.

Description

Technical Field

[0001] This application relates to the field of machining, and in particular to a method for machining a narrow, annular bottom groove in a high-temperature alloy turbine casing. Background Technology

[0002] High-temperature alloy turbine casings are crucial load-bearing components in next-generation advanced turbofan aero engines. Their structure incorporates mounting ring grooves of various shapes for assembling and positioning inner ring components. One type features a narrow, round-bottomed groove located at the weakest rigid end face, such as... Figure 1 As shown, the following problems are encountered in the processing: 1) The part material is difficult to process, which causes the tool to wear easily and produces built-up edge, resulting in a flared mouth quality problem in the processed groove; 2) The poor rigidity of the material structure and the large contact area between the groove bottom and the tool cause the special forming welded turning tool to jam easily, resulting in a quality problem of the cutting tool. Summary of the Invention

[0003] In view of this, this application provides a method for machining a narrow, round bottom annular groove in a high-temperature alloy turbine casing, which solves the problems in the prior art, can effectively control the machining dimensions and surface quality of the groove, and improve the machining quality of the annular groove.

[0004] The processing method for a narrow, annular bottom groove in a high-temperature alloy turbine casing provided in this application adopts the following technical solution:

[0005] A method for machining a narrow, annular groove on the bottom of a high-temperature alloy turbine casing. The narrow, annular groove includes a straight groove region and an arc-shaped bottom region. The arc-shaped bottom region is arc-shaped, and its diameter is equal to the groove width L of the straight groove region. The machining method includes the following steps:

[0006] Step 1: Using a grooving tool, rough machining of the straight groove area is performed starting from the designed position of the part to obtain the initial straight groove area. The machining allowance for the initial straight groove area rough machining is 0.04-0.08mm on each side.

[0007] Step 2: Using a ball end mill, the cutter enters from the groove opening of the initial straight groove area to the bottom of the initial straight groove area. Then, rough machining of the arc-shaped groove bottom area begins to obtain the initial arc-shaped groove bottom area. The radius of the ball end mill... When machining the bottom area of ​​the initial arc groove with a ball end mill, the tool is moved in and out along the depth direction of the narrow arc groove. The machining allowance for rough machining of the bottom area of ​​the initial arc groove is 0.04-0.08 mm on each side.

[0008] Step 3: Using a ball end mill, starting from the groove opening of the initial straight groove area, perform finishing on the initial straight groove area and the initial circular arc groove bottom area to obtain the final narrow circular bottom groove. The radius of the ball end mill...

[0009] Optionally, in step 2, the feed rate of the ball cutter from the opening of the initial straight groove area to the bottom of the initial straight groove area is 0.3-0.5 mm / s.

[0010] Optionally, in steps 2 and 3, cutting fluid is sprayed at intervals to the cutting position during the machining process, with each spray lasting 1-3 seconds, the spray interval being 2-5 seconds, and the spray flow rate being 2-5 L / min.

[0011] Optionally, in step 1, the cutting width a of the grooving tool is in the range of L-0.8mm to L-0.5mm.

[0012] Optionally, the radius of the grooving tool tip fillet is 0.15-0.25 mm.

[0013] Optionally, in steps 1 and 2, the rotational speed of the grooving cutter and the ball cutter is 10-12 r / s, and the feed speed is 0.06-0.12 mm / s.

[0014] In summary, this application includes the following beneficial technical effects:

[0015] This application removes large allowances from the straight groove area and the bottom of the arc groove, avoiding a hardened layer, reducing wear on finishing tools, and effectively preventing the formation of a flared opening in the narrow annular bottom groove during finishing. Furthermore, the machined grooving cutter and machined ball end mill used are insert-compatible; when the inserts wear out, replacement allows for quick and accurate tool setting, ensuring machining precision.

[0016] Spraying cutting fluid onto the cutting position at intervals can effectively prevent hardening, reduce tool wear during finishing, avoid overcutting, ensure that the small single-sided allowance requirement in this application can be met, improve machining dimensional accuracy, and effectively prevent the formation of a flared mouth in the annular narrow bottom groove during finishing. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a partial structural diagram of the annular narrow circular bottom groove of the turbine casing in an embodiment of this application;

[0019] Figure 2 This is a flowchart of the processing method of this application. Detailed Implementation

[0020] The embodiments of this application will now be described in detail with reference to the accompanying drawings.

[0021] The following specific examples illustrate the implementation of this application. Those skilled in the art can easily understand other advantages and effects of this application from the content disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. This application can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this application. It should be noted that, in the absence of conflict, the following embodiments and features in the embodiments can be combined with each other. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0022] It should be noted that various aspects of embodiments within the scope of the appended claims are described below. It will be apparent that the aspects described herein can be embodied in a wide variety of forms, and any particular structure and / or function described herein is merely illustrative. Based on this application, those skilled in the art will understand that one aspect described herein can be implemented independently of any other aspect, and two or more of these aspects can be combined in various ways. For example, any number of aspects set forth herein can be used to implement the device and / or practice the method. Additionally, this device and / or method can be implemented using structures and / or functionalities other than one or more of the aspects set forth herein.

[0023] It should also be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of this application. The drawings only show the components related to this application and are not drawn according to the actual number, shape and size of the components in the actual implementation. In the actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0024] Furthermore, specific details are provided in the following description to facilitate a thorough understanding of the examples. However, those skilled in the art will understand that the described aspects can be practiced without these specific details.

[0025] This application provides a method for machining a narrow, annular bottom groove in a high-temperature alloy turbine casing.

[0026] like Figure 1 As shown, the annular narrow circular bottom groove includes a straight groove region and a circular arc bottom region. The diameter of the circular arc bottom region is equal to the groove width L of the straight groove region, and the depth of the circular arc bottom region is... In this embodiment of the application, the depth D of the annular narrow circular bottom groove is greater than 2.7 mm, and the groove width L is 2 mm.

[0027] likeFigure 2 As shown, the processing method includes the following steps:

[0028] Step 1: Using a grooving tool suitable for machining high-temperature alloys, rough machining of the straight groove area is performed starting from the designed position on the part to obtain the initial straight groove area. The depth of the initial straight groove area is... The initial machining allowance for the rough machining of the straight groove area is 0.04-0.08 mm per side.

[0029] Step 2: Using a ball end mill suitable for machining high-temperature alloys, the cutter enters from the groove opening of the initial straight groove area to the bottom of the initial straight groove area. Then, rough machining of the arc-shaped groove bottom area begins to obtain the initial arc-shaped groove bottom area. The radius of the ball end mill... When machining the bottom area of ​​the initial arc groove with a ball end mill, the tool is moved in and out along the depth direction of the narrow arc groove. The machining allowance for rough machining of the bottom area of ​​the initial arc groove is 0.04-0.08 mm on each side.

[0030] During the machining of the initial arc groove bottom area, a straight up-and-down tool entry and retraction method is adopted, using a radius... The cutting tool can complete the initial arc groove bottom area machining in one feed, without controlling the tool to gradually expand the groove from the center to the outside. Since the radial rigidity of the housing is weaker than the axial rigidity, the force exerted on the housing during the cutting process of the ball end mill in this application is along the axial direction of the housing, and no oscillating turning method is used, which reduces the radial force on the housing during the machining process, avoids deformation of the housing during the machining process, and improves the machining accuracy.

[0031] Step 3: Using a ball end mill, starting from the groove opening of the initial straight groove area, perform finishing on the initial straight groove area and the initial circular arc groove bottom area to obtain the final narrow circular bottom groove. The radius of the ball end mill... It facilitates tool connection at the bottom of the arc groove, avoids the formation of a tool connection platform, and improves the surface quality of the annular groove.

[0032] This application removes large allowances from the straight groove area and the bottom of the arc groove, avoiding a hardened layer, reducing tool wear during finishing, and effectively preventing the formation of a flared opening in the narrow annular bottom groove during finishing. Simultaneously, the machined grooving cutter and machined ball end mill used are replaceable; when the cutters wear out, replacement allows for quick and accurate tool setting, ensuring machining precision. In the embodiments of this application, the roughing allowance for the initial straight groove area and the initial arc groove bottom area is 0.05mm on each side.

[0033] In step 2, the ball cutter's feed speed from the opening of the initial straight groove region to the bottom of the initial straight groove region is 0.3-0.5 mm / s. This allows the ball cutter to quickly reach the bottom of the initial straight groove region.

[0034] In step 1, the cutting width 'a' of the grooving cutter ranges from L-0.8mm to L-0.5mm; the fillet radius of the grooving cutter's tip is 0.15-0.25mm, in order to maximize the rigidity of the tool and avoid tool chatter. The small fillet radius of the tool tip means that there is no need to use a ball end mill for roughing, and the initial straight groove area can be machined directly by the grooving cutter.

[0035] In step 1, the grooving tool rotates at a speed of 10–12 r / s and the feed rate is 0.06–0.12 mm / s. In this embodiment, the appropriate rotational speed and feed rate of the tool, combined with a tool of high rigidity, can effectively reduce the risk of tool jamming.

[0036] In step 2, the grooving cutter rotates at a speed of 10-12 r / s and the feed rate is 0.06-0.12 mm / s.

[0037] In steps 2 and 3, cutting fluid is sprayed intermittently onto the cutting position during machining. After each spray, the nozzle is moved outside the machining area, and spraying stops. Each spray lasts 1-3 seconds, with an interval of 2-5 seconds between sprays, and a flow rate of 2-5 L / min. This effectively prevents hardening, reduces tool wear during finishing, avoids overcutting, ensures the achievement of the smaller single-sided allowance requirement in this application, improves machining dimensional accuracy, and effectively prevents the formation of a flared opening in the narrow annular groove during finishing. Furthermore, the tool's rake face is continuously air-cooled during machining.

[0038] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A method for machining a narrow, annular groove on the bottom of a high-temperature alloy turbine casing, the narrow, annular groove comprising a straight groove region and an arc-shaped groove bottom region, the arc-shaped groove bottom region being arc-shaped, and the diameter of the arc-shaped groove bottom region being equal to the groove width L of the straight groove region, characterized in that... The processing method includes the following steps: Step 1: Using a grooving tool, rough machining of the straight groove area is performed starting from the designed position of the part to obtain the initial straight groove area. The machining allowance for the initial straight groove area rough machining is 0.04-0.08mm on each side. Step 2: Using a ball end mill, the cutter enters from the groove opening of the initial straight groove area to the bottom of the initial straight groove area. Then, rough machining of the arc-shaped groove bottom area begins to obtain the initial arc-shaped groove bottom area. The radius of the ball end mill... When machining the bottom area of ​​the initial arc groove with a ball end mill, the tool is moved in and out along the depth direction of the narrow arc groove. The machining allowance for rough machining of the bottom area of ​​the initial arc groove is 0.04-0.08 mm on each side. Step 3: Using a ball end mill, starting from the groove opening of the initial straight groove area, perform finishing on the initial straight groove area and the initial circular arc groove bottom area to obtain the final narrow circular bottom groove. The radius of the ball end mill...

2. The method for machining the annular narrow circular bottom groove of the high-temperature alloy turbine casing according to claim 1, characterized in that, In step 2, the feed rate of the ball cutter from the opening of the initial straight groove area to the bottom of the initial straight groove area is 0.3-0.5 mm / s.

3. The method for machining the annular narrow circular bottom groove of the high-temperature alloy turbine casing according to claim 1, characterized in that, In steps 2 and 3, cutting fluid is sprayed at intervals to the cutting position during the machining process. Each spray lasts for 1-3 seconds, the interval between sprays is 2-5 seconds, and the spray flow rate is 2-5 L / min.

4. The method for machining the annular narrow circular bottom groove of the high-temperature alloy turbine casing according to claim 1, characterized in that, In step 1, the cutting width 'a' of the grooving tool ranges from L-0.8mm to L-0.5mm.

5. The method for machining the annular narrow circular bottom groove of the high-temperature alloy turbine casing according to claim 1, characterized in that, The radius of the grooving tool tip is 0.15-0.25mm.

6. The method for machining the annular narrow circular bottom groove of the high-temperature alloy turbine casing according to claim 1, characterized in that, In steps 1 and 2, the grooving cutter and the ball cutter rotate at 10-12 r / s and the feed rate is 0.06-0.12 mm / s.

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