High pressure turbine outer ring block assembly grinding apparatus, method and grinding machine

Abstract

The present application relates to high-pressure turbine assembly manufacturing technology field, especially to a kind of high-pressure turbine outer ring block combination grinding machining grinder device, method and grinder equipment, by setting two reference points on base, one of the reference points is the center of reference circle, the other reference point is the center of eccentric circle, when grinding, by twice alignment, first align the center of reference circle to grind upper half circle, then align the center of eccentric circle to grind lower half circle, to ensure long and short axis size, upper and lower half circle size and runout value, realized the grinding work of two different reference of outer ring block by numerical control vertical grinder, and ensured the requirement of related size. By setting positioning hole, anti-misoperation hole and pressing assembly on base, realized the positioning and pressing of high-pressure turbine casing assembly to be processed, ensured the uniqueness of its assembly position, the method is simple, low cost and high efficiency. Solve the problem that existing grinding technology cannot guarantee the size structure grinding precision of two eccentric circle parts.

Description

Technical Field

[0001] This invention relates to the field of high-pressure turbine component processing and manufacturing technology, specifically to a grinding machine device, method, and grinding equipment for combined grinding of an eccentric circular high-pressure turbine outer ring block. Background Technology

[0002] The high-pressure turbine casing assembly is mounted at the rear end of the main combustion chamber unit, primarily functioning to work in conjunction with the high-pressure turbine rotor. Strict assembly clearances are required between the high-pressure turbine casing assembly and the high-pressure turbine rotor; specifically, extremely tight clearances are required between the high-pressure turbine outer ring block and the high-pressure turbine rotor blade tips. The high-pressure turbine casing assembly is a complex assembly; the main component is the high-pressure turbine casing itself. The outer ring support ring assembly and the high-pressure turbine outer ring are inlaid and assembled onto the casing using nuts, bolts, and washers, and secured with outer ring fixing rings. According to the drawings, the outer ring block of the high-pressure turbine casing assembly requires upper and lower semicircles with an eccentricity between them. Machining must ensure the dimensions of the upper and lower semicircles, the major and minor axis dimensions, and related runout values ​​to guarantee turbine efficiency. Therefore, high runout tolerances are required for the outer ring, necessitating grinding of the outer ring block or application of abrasive coatings in the assembled state to achieve the required precision. Current grinding machines only have one center for alignment, making it impossible to machine parts with two eccentric circles on a CNC vertical grinding machine. Therefore, it is impossible to meet the machining accuracy requirements for the upper and lower semicircular dimensions, major and minor axis dimensions, and related runout values ​​of the outer ring block of the high-pressure turbine casing assembly. Summary of the Invention

[0003] To address the problem that existing grinding technologies cannot guarantee the grinding accuracy of parts with two eccentric circles, this invention provides a grinding machine device, method, and equipment for grinding high-pressure turbine outer ring blocks.

[0004] To achieve the above objectives, the present invention employs the following technical solution:

[0005] This invention provides a grinding machine device for machining a high-pressure turbine outer ring block combination, including a base with two reference points. One reference point is the center of a reference circle, and the other is the center of an eccentric circle. The distance between the center of the reference circle and the center of the eccentric circle is the eccentricity between the center of the upper half circle and the center of the lower half circle of the high-pressure turbine casing assembly to be machined. The base also has a positioning hole and an anti-misalignment hole. The positioning hole corresponds to the precision hole of the high-pressure turbine casing assembly to be machined, and the anti-misalignment hole corresponds to the offset hole of the high-pressure turbine casing assembly to be machined. A positioning pin is inserted into the positioning hole, and an anti-misalignment pin is inserted into the anti-misalignment hole. A clamping assembly is provided at the end of the base for clamping the high-pressure turbine casing assembly to be machined.

[0006] Furthermore, the clamping assembly includes a pressure plate, one end of which is supported by an adjusting support, and the other end of which clamps the mounting edge of the high-pressure turbine casing assembly to be processed.

[0007] Furthermore, the pressure plate is connected to the base by a stud and fixed by a nut; the pressure plate is provided with a strip-shaped mounting hole, through which the stud passes and connects to the base.

[0008] Preferably, the positioning pin is a diamond-shaped pin structure; the anti-misalignment pin is a cylindrical pin structure.

[0009] The present invention also provides a method for combined grinding of outer ring blocks with eccentric circular high-pressure turbine using the above-mentioned grinding machine apparatus, comprising:

[0010] Using the center of the reference circle as the alignment reference, the upper semicircle of the outer ring block of the high-pressure turbine casing assembly to be machined is aligned.

[0011] The upper half-circle of the outer ring block after alignment is ground.

[0012] After grinding the upper half circle of the outer ring block after alignment, the lower half circle of the outer ring block is aligned using the center of the eccentric circle as the alignment reference.

[0013] The lower half-circle of the outer ring block after alignment is ground to complete the combined grinding of the outer ring block of the high-pressure turbine with eccentric circle.

[0014] Furthermore, when aligning the upper half-circle of the outer ring block of the high-pressure turbine casing assembly using the center of the reference circle as the alignment reference, the point runout value is <0.02mm, and the whole circle runout value is <0.03mm.

[0015] Furthermore, after grinding the upper half-circle of the outer ring block after alignment, when aligning the lower half-circle of the outer ring block with the center of the eccentric circle as the alignment reference, the runout value of the entire circle is <0.03mm.

[0016] Furthermore, the method for grinding the upper semicircle of the aligned outer ring block is as follows:

[0017] Φ B =Φ A +2δ 上 (1)

[0018] Where, Φ B The actual required diameter of the upper semicircle of the outer ring block to be machined is Φ. A δ is the diameter of the turbine rotor blade tip. 上 This is the clearance value between the turbine rotor blade tip and the top of the high-pressure turbine outer ring assembly;

[0019] but:

[0020] R1=Φ B / twenty two)

[0021] Where R1 is the radius of the reference circle to be processed;

[0022] Grind the upper half-circle of the outer ring block according to the value of R1 to complete the upper half-circle machining.

[0023] Furthermore, the lower half-circle of the aligned outer ring block is ground to complete the combined grinding process of the outer ring block of the high-pressure turbine with eccentric circle.

[0024] Φ C =Φ A +δ 上 +δ 下 (3)

[0025] R2=Φ C -R1-X (4)

[0026] Where, Φ C Φ is the value of the major axis. A δ is the diameter of the turbine rotor blade tip. 上 δ represents the clearance between the turbine rotor blade tip and the top of the high-pressure turbine outer ring assembly. 下 R1 is the clearance between the turbine rotor blade tip and the lower part of the high-pressure turbine outer ring assembly, R2 is the radius of the upper semicircle, and X is the eccentricity between the center of the upper semicircle and the center of the lower semicircle of the high-pressure turbine casing assembly to be processed.

[0027] Φ D =2R² (5)

[0028] Where, Φ D The value of the minor axis;

[0029] According to Φ C The value of R2 and Φ D The value is used to grind the eccentric circle of the outer ring block after alignment, thus completing the combined grinding of the high-pressure turbine outer ring block with eccentric circle.

[0030] A CNC vertical grinding machine includes the above-mentioned high-pressure turbine outer ring block combined grinding grinding device.

[0031] Compared with the prior art, the present invention has the following beneficial effects:

[0032] This invention discloses a grinding machine device for machining a high-pressure turbine outer ring block. Two reference points are set on the base, one as the center of a reference circle and the other as the center of an eccentric circle. The distance between the centers of the reference and eccentric circles represents the eccentricity between the centers of the upper and lower semicircles of the high-pressure turbine casing assembly to be machined. During grinding, two alignments are performed: first, the reference circle is aligned to grind the upper semicircle, then the eccentric circle is aligned to grind the lower semicircle. This ensures the correct dimensions of the major and minor axes, the dimensions of the upper and lower semicircles, and the runout value. This allows the CNC vertical grinder to perform grinding work on the outer ring block using two eccentric reference points while maintaining the required dimensions. Positioning holes, anti-misalignment holes, and clamping components are provided on the base to achieve precise positioning and clamping of the high-pressure turbine casing assembly, ensuring the uniqueness of its assembly position. This device has a simple structure, low manufacturing cost, easy operation, good part machining quality, and high processing efficiency.

[0033] The mounting edge of the high-pressure turbine casing assembly to be processed is clamped by setting up a pressure plate and adjusting support.

[0034] By using the strip mounting holes and studs on the pressure plate, the connection between the pressure plate and the base is achieved. At the same time, the position of the pressure plate pressing the mounting edge of the high-pressure turbine casing assembly to be processed can be adjusted by adjusting the position of the studs in the strip mounting holes, thereby improving the versatility of the pressing assembly.

[0035] This invention also provides a method for grinding a combination of outer ring blocks of a high-pressure turbine with eccentric circles using the aforementioned grinding machine apparatus. This method involves using the center of a reference circle as the alignment reference to align the upper half-circle of the outer ring block of the high-pressure turbine casing assembly to be machined, and then grinding it. Next, using the center of the eccentric circle as the alignment reference, the lower half-circle of the outer ring block is aligned and ground, thus completing the combined grinding of the outer ring blocks of the high-pressure turbine with eccentric circles. Through these two alignments, effective control of the grinding accuracy of parts containing two eccentric circles is achieved, resulting in higher precision and higher processing efficiency.

[0036] During alignment, the point runout value is <0.02mm and the overall circle runout value is <0.03mm to ensure the machining accuracy of the final part.

[0037] The present invention also provides a CNC vertical grinding machine, including the above-mentioned high-pressure turbine outer ring block combined grinding machine device. This device can achieve precise grinding of parts with two eccentric circles, and has low modification cost and high processing efficiency. Attached Figure Description

[0038] Figure 1 This is a schematic diagram of a high-pressure turbine outer ring block combined grinding machine device according to the present invention.

[0039] Figure 2This is a flowchart of the high-pressure turbine outer ring block combined grinding process according to the present invention.

[0040] Figure 3 This is a schematic diagram of the dimensions and structure of various parts of the combined grinding of the outer ring block of a high-pressure turbine according to the present invention.

[0041] Among them, 1-base, 2-clamping assembly, 11-center of reference circle, 12-center of eccentric circle, 13-positioning hole, 14-anti-misoperation hole, 21-pressure plate, 22-adjustment support, 23-stud, 24-nut, 25-strip mounting hole. Detailed Implementation

[0042] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0043] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0044] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0045] In the description of the embodiments of the present invention, it should be noted that if terms such as "upper," "lower," "horizontal," or "inner" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of the invention is in use, they are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. Furthermore, terms such as "first" and "second" are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0046] Furthermore, the use of the term "horizontal" does not imply that the component must be absolutely horizontal, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0047] In the description of the embodiments of the present invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in the present invention according to the specific circumstances.

[0048] The present invention will be further described in detail below with reference to specific embodiments. These descriptions are for explanation purposes only and are not intended to limit the scope of the invention.

[0049] See Figure 1 The present invention discloses a grinding machine assembly for high pressure turbine outer ring block combined grinding, including a base 1 and a clamping assembly 2;

[0050] Two reference points are provided on the base 1. One reference point is the center of the reference circle 11, and the other reference point is the center of the eccentric circle 12. The distance between the center of the reference circle 11 and the center of the eccentric circle 12 is the eccentricity between the center of the upper and lower semicircles of the high-pressure turbine casing assembly to be processed. When defining the upper and lower semicircles, the high-pressure turbine casing assembly to be processed is divided into upper and lower semicircles according to the processing flow. The semicircle closest to the form and position tolerance circle U marked on the high-pressure turbine casing assembly to be processed is the upper semicircle. The lower semicircle is defined by the semicircle furthest from the dimensional tolerance circle U of the high-pressure turbine casing assembly to be machined, and the top and bottom are marked accordingly. The base 1 is also provided with a positioning hole 13 and an anti-misalignment hole 14. The positioning hole 13 corresponds to the precision hole of the high-pressure turbine casing assembly to be machined, and the anti-misalignment hole 14 corresponds to the offset hole of the high-pressure turbine casing assembly to be machined. A positioning pin is inserted into the positioning hole 13, and the positioning pin has a diamond-shaped pin structure. An anti-misalignment pin is inserted into the anti-misalignment hole 14, and the anti-misalignment pin has a cylindrical pin structure.

[0051] The clamping assembly 2 is disposed at the end of the base 1 and is used to clamp the high-pressure turbine casing assembly to be processed. It includes a pressure plate 21, which is connected to the base 1 by a stud 23 and fixed by a nut 24. The pressure plate 2 has a strip-shaped mounting hole 25, through which the stud 23 passes and is connected to the base 1. One end of the pressure plate 21 is supported by an adjusting support 22, and the other end clamps the mounting edge of the high-pressure turbine casing assembly to be processed.

[0052] See Figure 2 and Figure 3 The present invention also provides a method for combined grinding of an outer ring block with an eccentric circular high-pressure turbine using the above-mentioned grinding machine device, comprising:

[0053] S1: Using the center 11 of the reference circle as the alignment reference, align the upper semicircle of the outer ring block of the high-pressure turbine casing assembly to be machined, specifically as follows:

[0054] Place the part on the base 1 and fix it in place with the clamping assembly 2, positioning pin, and anti-misalignment positioning pin;

[0055] Using the center 11 of the reference circle as the alignment reference, the upper half circle of the outer ring block of the high-pressure turbine casing assembly to be machined is aligned so that the point runout is <0.02mm and the whole circle runout is <0.03mm.

[0056] S2: Grinding is performed on the upper semicircle of the outer ring block after alignment, specifically as follows:

[0057] Φ B =Φ A +2δ 上 (1)

[0058] Where, Φ B The actual required diameter of the upper semicircle of the outer ring block to be machined is Φ. A δ is the diameter of the turbine rotor blade tip. 上 This is the clearance value between the turbine rotor blade tip and the top of the high-pressure turbine outer ring assembly;

[0059] but:

[0060] R1=Φ B / twenty two)

[0061] Where R1 is the radius of the reference circle to be processed;

[0062] Grind the upper half-circle of the outer ring block according to the value of R1 to complete the upper half-circle machining.

[0063] S3: After grinding the upper half-circle of the outer ring block after alignment, use the center of the eccentric circle 12 as the alignment datum to align the lower half-circle of the outer ring block, specifically as follows:

[0064] Using the center 12 of the eccentric circle as the alignment reference, tap the high-pressure turbine casing assembly to be processed to align the lower half circle of the outer ring block, so that the point runout is <0.02mm and the whole circle runout is <0.03mm.

[0065] S4: Grind the lower half-circle of the aligned outer ring block to complete the combined grinding of the outer ring block of the high-pressure turbine with eccentric circle. Specifically:

[0066] Φ C =Φ A +δ 上 +δ 下 (3)

[0067] R2=Φ C -R1-X (4)

[0068] Where, Φ C Φ is the value of the major axis. A δ is the diameter of the turbine rotor blade tip. 上 δ represents the clearance between the turbine rotor blade tip and the top of the high-pressure turbine outer ring assembly. 下 R1 is the clearance between the turbine rotor blade tip and the outer ring assembly of the high-pressure turbine, R2 is the radius of the upper semicircle, and X is the eccentricity between the center of the upper semicircle and the center of the lower semicircle of the high-pressure turbine casing assembly to be processed.

[0069] Φ D =2R² (5)

[0070] Where, Φ D The value of the minor axis;

[0071] According to Φ C The value of R2 and Φ D The value is used to grind the eccentric circle of the outer ring block after alignment, and the combined grinding of the high-pressure turbine outer ring block with eccentric circle is completed to ensure accurate machining of the long and short shaft dimensions, upper and lower circle radii and runout.

[0072] This invention also provides a CNC vertical grinding machine, including the aforementioned high-pressure turbine outer ring block combined grinding machine device. This equipment can achieve precise grinding of parts with two eccentric circles, and features low modification costs and high processing efficiency.

[0073] In summary, this invention provides a grinding machine device, method, and equipment for combined grinding of high-pressure turbine outer ring blocks with eccentric circles. Through improvements to the grinding machine device, and by performing two alignment and grinding operations, it achieves precise grinding of the dimensional structure of parts containing two eccentric circles, solving the problem of the inability to accurately grind eccentric circles in CNC vertical grinding equipment. At the same time, the device has a compact structure, low manufacturing cost, good part processing quality, high processing efficiency, low equipment modification cost, and a simple and easy-to-operate method.

[0074] The above description is merely a preferred embodiment of the present invention and is not intended to limit the technical solution of the present invention in any way. Those skilled in the art should understand that, without departing from the spirit and principles of the present invention, the technical solution can be modified and replaced in several simple ways, and these modifications and replacements are all within the scope of protection covered by the claims.

Claims

1. A grinding machine device for processing high-pressure turbine outer ring blocks, characterized in that, The system includes a base (1) on which two reference points are provided. One reference point is the center of a reference circle (11), and the other reference point is the center of an eccentric circle (12). The distance between the center of the reference circle (11) and the center of the eccentric circle (12) is the eccentricity between the center of the upper half circle and the center of the lower half circle of the high-pressure turbine casing assembly to be processed. The base (1) is also provided with a positioning hole (13) and an anti-misalignment hole (14). The positioning hole (13) corresponds to the precision hole of the high-pressure turbine casing assembly to be processed, and the anti-misalignment hole (14) corresponds to the offset hole of the high-pressure turbine casing assembly to be processed. A positioning pin is inserted in the positioning hole (13), and an anti-misalignment pin is inserted in the anti-misalignment hole (14). A clamping assembly (2) is provided at the end of the base (1) to clamp the high-pressure turbine casing assembly to be processed.

2. The high-pressure turbine outer ring block combined grinding machine device according to claim 1, characterized in that, The clamping assembly (2) includes a pressure plate (21), one end of which is supported by an adjusting support (22), and the other end is pressed against the mounting edge of the high-pressure turbine casing assembly to be processed.

3. The high-pressure turbine outer ring block combined grinding machine device according to claim 2, characterized in that, The pressure plate (21) is connected to the base (1) by a stud (23) and fixed by a nut (24); the pressure plate (21) is provided with a strip-shaped mounting hole (25), and the stud (23) passes through the strip-shaped mounting hole (25) and is connected to the base (1).

4. The grinding machine apparatus for high-pressure turbine outer ring block combined grinding according to claim 1, characterized in that, The positioning pin is a diamond-shaped pin structure; the anti-misalignment pin is a cylindrical pin structure.

5. A method for combined grinding of an outer ring block with an eccentric circular high-pressure turbine using the grinding machine apparatus according to any one of claims 1-4, characterized in that, include: Using the center of the reference circle (11) as the alignment reference, the upper half circle of the outer ring block of the high-pressure turbine casing assembly to be machined is aligned. The upper half-circle of the outer ring block after alignment is ground. After grinding the upper half circle of the outer ring block after alignment, the lower half circle of the outer ring block is aligned using the center of the eccentric circle (12) as the alignment reference. The lower half-circle of the outer ring block after alignment is ground to complete the combined grinding of the outer ring block of the high-pressure turbine with eccentric circle.

6. The method for combined grinding of outer ring blocks of eccentric high-pressure turbines according to claim 5, characterized in that, The reference circle center (11) is used as the alignment reference. When aligning the upper half circle of the outer ring block of the high-pressure turbine casing assembly to be machined, the point runout value is <0.02mm and the whole circle runout value is <0.03mm.

7. The method for combined grinding of outer ring blocks of eccentric high-pressure turbines according to claim 5, characterized in that, After grinding the upper half circle of the outer ring block after alignment, the lower half circle of the outer ring block is aligned using the center of the eccentric circle (12) as the alignment reference. The runout value of the whole circle is <0.03mm.

8. The method for machining the outer ring block of an eccentric high-pressure turbine assembly according to claim 5, characterized in that, The method for grinding the upper semicircle of the aligned outer ring block is as follows: F B =Φ A +2d 上 (1) Where, Φ B The actual required diameter of the upper semicircle of the outer ring block to be machined is Φ. A δ is the diameter of the turbine rotor blade tip. 上 This is the clearance value between the turbine rotor blade tip and the top of the high-pressure turbine outer ring assembly; but: R1=Φ B / 2 (2) Where R1 is the radius of the reference circle to be processed; Grind the upper half-circle of the outer ring block according to the value of R1 to complete the upper half-circle machining.

9. The method for combined grinding of outer ring blocks of eccentric high-pressure turbines according to claim 5, characterized in that, The method for grinding the lower half-circle of the aligned outer ring block to complete the combined grinding of the high-pressure turbine outer ring block with eccentric circle is as follows: F C =Φ A +d 上 +d 下 (3) R2=Φ C -R1-X (4) Where, Φ C Φ is the value of the major axis. A δ is the diameter of the turbine rotor blade tip. 上 δ represents the clearance between the turbine rotor blade tip and the top of the high-pressure turbine outer ring assembly. 下 R1 is the clearance between the turbine rotor blade tip and the outer ring assembly of the high-pressure turbine, R2 is the radius of the upper semicircle, and X is the eccentricity between the center of the upper semicircle and the center of the lower semicircle of the high-pressure turbine casing assembly to be processed. F D =2R2 (5) Where, Φ D The value of the minor axis; According to Φ C The value of R2 and Φ D The value is used to grind the eccentric circle of the outer ring block after alignment, thus completing the combined grinding of the high-pressure turbine outer ring block with eccentric circle.

10. A CNC vertical grinding machine, characterized in that, The grinding machine apparatus includes the high-pressure turbine outer ring block combined grinding machine according to any one of claims 1-4.

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