A method for processing and positioning device for rectifier blade assembly

Abstract

This invention discloses a method for processing a rectifier blade assembly and a positioning device. The processing method includes a positioning step and a drilling step. The positioning step further includes positioning the axis of the rectifier blade assembly, positioning the axial position of the rectifier blade assembly, positioning the rotation direction of the blade, and positioning the rotation direction of the rocker arm. After completing the above steps, a hole for installing a positioning pin is finally drilled in the rocker arm on the rectifier blade assembly. The positioning device designed in this invention includes a first positioning module for positioning the outer circle of the journal, a second positioning module for positioning the outer circle of the bushing, a third positioning module for positioning the theoretical cross-section of the blade, and a fourth positioning module for positioning the inner hole of the inner ball joint of the rocker arm. This invention can achieve accurate positioning of the hole for installing the positioning pin on the rocker arm, as well as angular positioning of the compressor axis relative to the rectifier blade and angular positioning of the rocker arm relative to the rectifier blade.

Description

Technical Field

[0001] This invention belongs to the field of aero-engine manufacturing technology, specifically relating to a positioning method and positioning fixture in the processing of rectifier blade assembly parts. Background Technology

[0002] In aero engines, the rectifier blade assembly is an important component of the compressor, and its structure is as follows: Figure 1 As shown, the assembly mainly consists of a blade with a journal (rectifier blade), a bushing, and a rocker arm. The main machining task after assembling the rectifyer blade is to machine a hole on the rocker arm for mounting a locating pin. After machining, it is necessary to ensure that the line W connecting the intersection points N and K of the VI-VI section of the rectifyer blade profile, offset by a theoretical value in both the positive and negative directions of the X-axis relative to the blade profile section coordinate system, and the blade head curve within the VI-VI section, forms an angle with the compressor axis. The compressor axis is determined by a theoretical angle α offset from the X-axis relative to the blade profile section coordinate system. However, since the coordinates of intersection points N and K are based on the theoretical blade profile section coordinate system used in blade modeling, they cannot be directly determined on the actual blade. That is, the theoretical intersection points N and K cannot be accurately captured on the actual blade. Therefore, it is difficult to ensure the angular position of the rocker arm and blade by locating points N and K on the blade profile surface, and other positioning methods must be used to solve this problem. Summary of the Invention

[0003] The present invention aims to provide a method for processing rectifier blade components and a positioning device to achieve accurate positioning of the holes for mounting positioning pins on the rocker arm and angular positioning of the compressor shaft relative to the rectifier blades, thereby completing the processing of the holes for mounting positioning pins.

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

[0005] A method for manufacturing a rectifier blade assembly includes a positioning step and a drilling step. The rectifier blade assembly mainly consists of a blade with a journal, a bushing, and a rocker arm with an inner ball head. One cross-section of the blade has an angular requirement with the compressor axis. The end face of the bushing serves as a reference surface for determining the position of the aforementioned cross-section on the blade. The positioning step includes:

[0006] The step of locating the axis of the rectifier blade assembly is to determine the axis of the rectifier blade assembly by using the support points of the outer circle of the journal and the outer circle of the bushing in the rectifier blade assembly.

[0007] The step of locating the axial position of the rectifier blade assembly is to define the axial position of the rectifier blade assembly by positioning the bushing end face in the rectifier blade assembly.

[0008] The steps for determining the rotation direction of the blade are as follows: Select a section on the blade of the rectifier blade assembly that has an angular requirement with respect to the compressor axis, and select a point on the air profile curve of that section as a control point to limit the rotation direction of the blade around the axis of the rectifier blade assembly.

[0009] The step of positioning the rocker arm rotation direction is to limit the rotation direction of the rocker arm around the axis of the rectifier blade assembly by setting a control point in the inner hole of the ball head inside the rocker arm.

[0010] As an alternative, in the step of locating the rotation direction of the blade, the coordinate point data of the theoretical cross section of the blade corresponding to the cross section with the angular requirement of the compressor axis is obtained, the blade profile curve is drawn based on the coordinate point data, a coordinate value is selected on the Y-axis of the theoretical cross section coordinate system of the blade, and a straight line parallel to the X-axis of the coordinate system is drawn to intersect the blade profile curve at a point, the X-axis coordinate value of the point is obtained, the point is connected to the zero point of the theoretical cross section coordinate system of the blade to obtain a line segment, the angle θ between the line segment and the X-axis is obtained, and the point is taken as the control point on the blade profile curve.

[0011] Alternatively, in the step of positioning the rotation direction of the rocker arm, a pin inserted into the inner hole of the ball head of the rocker arm is used as a control point to limit the rotation direction of the rocker arm around the axis of the rectifier blade assembly.

[0012] Furthermore, the drilling step involves drilling a hole for a positioning pin on the surface of the rocker arm after the positioning step is completed. The axis of this hole intersects perpendicularly with the axis of the rectifier blade assembly.

[0013] A positioning device for the above-described rectification blade assembly processing method includes:

[0014] A first positioning module for positioning the outer circle of a journal, the first positioning module includes a first positioning groove with an upward opening that can accommodate the outer circle surface of the journal.

[0015] A second positioning module for positioning the outer circle of the bushing, the second positioning module includes a second positioning groove with an upward opening that can accommodate the outer circle surface of the bushing.

[0016] A third positioning module is used for positioning the section on the blade that has an angular requirement with respect to the compressor axis. The third positioning module is set between the first positioning module and the second positioning module, and includes a ball head support and a floating support arranged coaxially. The ball head support and the floating support form a clamping space for the section on the blade that has an angular requirement with respect to the compressor axis. The contact point between the ball head support or the floating support and the blade is the control point.

[0017] A fourth positioning module for positioning the inner hole of the inner ball head of the rocker arm. The fourth positioning module is located on the same side as the first positioning module, the second positioning module and the third positioning module, and includes a support. The support has an opening groove for accommodating the rocker arm and a horizontal slot for placing a pin. After the pin passes through the inner hole of the inner ball head of the rocker arm, both ends are placed in the horizontal slot.

[0018] Alternatively, the lower ends of the first positioning module, the second positioning module, the third positioning module, and the fourth positioning module can all be detachably connected to the upper end of the base.

[0019] Alternatively, the first positioning groove is sized to match the outer diameter of the journal, and the second positioning groove is sized to match the outer diameter of the bushing.

[0020] Compared with the prior art, the present invention is easy to implement and has accurate positioning. It converts two difficult-to-capture points on the blade profile into one control point. With the help of other positioning measures, it can ensure the correct machining of the hole for the positioning pin on the rocker arm. At the same time, it can accurately position the angular relationship between the rocker arm and the blade, and finally meet the angular relationship between the compressor axis and the line connecting the blade profile section as required by the machining. Attached Figure Description

[0021] Figure 1 This is a part drawing of the rectifier blade assembly;

[0022] Figure 2 A three-dimensional view of the rectifier blade assembly;

[0023] Figure 3 A schematic diagram for selecting blade control points;

[0024] Figure 4 Diagram of the positioning device;

[0025] Figure 5 Plan and sectional views of the positioning device;

[0026] Figure 6 A diagram showing the state of clamping the rectifier blade assembly for the positioning device;

[0027] Figure 7 This diagram shows the relationship between the coordinate system of the positioning device and the coordinate system of the rectifier blade.

[0028] In the diagram, 1-first positioning module, 2-third positioning module, 3-second positioning module, 4-fourth positioning module, and 5-base. Detailed Implementation

[0029] The present invention will be further described below with reference to specific embodiments, but it should not be construed as limiting the scope of the subject matter of the present invention to the following embodiments. All modifications, substitutions and alterations made based on ordinary technical knowledge and common practices in the art without departing from the above-described technical concept of the present invention are included within the scope of the present invention.

[0030] like Figure 1 As shown, section BB is a cross-section perpendicular (i.e., 90°) to the line connecting the center point of the rocker arm and the center point of the blade. The angle between the compressor axis and the X-axis in the blade profile section is α. The drawing requires that the angle between the straight line W and the line connecting the center point of the rocker arm and the center point of the blade be β. The center points of the rocker arm and the blade can be directly found and determined on the actual rectifier blade. At this point, the position of the rocker arm is determined, and the blade only has one degree of freedom to rotate around its center point. Therefore, it is only necessary to set one control point on the blade to determine the position of the blade section, and thus the position of the blade, ultimately ensuring the positional relationship between the blade and the rocker arm (i.e., the angle β), while also ensuring the positional relationship between the compressor axis and the straight line W on the blade's blade profile.

[0031] Based on the above analysis, the positioning principle of the positioning device in this embodiment is as follows: through the rectifier blade journal and the outer circle of the bushing (e.g. Figure 2 The axis of the rectifier blade is determined by two support points, and its axial position is defined by the reference surface (i.e., the bushing end face) of the blade section in the rectifier blade drawing that has an angular requirement with respect to the compressor axis. Figure 1 and Figure 3 The cross section with a length of Z at the end face of the mid-distance bushing is the blade cross section that has an angular requirement with respect to the compressor axis as required by the part drawing. By setting a control point on the blade cross section that has an angular requirement with respect to the compressor axis, the rotation direction of the blade around the axis is limited. By setting a control point in the inner hole of the inner ball head of the rocker arm, the rotation direction of the rocker arm around the axis is limited, and finally, complete positioning is achieved.

[0032] The method for obtaining control points on the blade cross-section that has angular requirements relative to the compressor axis is as follows: Figure 3 The blade section corresponding to the rectifier blade drawing is given. Figure 3 Draw the airfoil profile curve from the coordinate point of the mid-section AA (distance Z from the end face of the bushing). Based on the coordinate system of the blade theoretical section where this section is located, select a coordinate value on the Y-axis and draw a straight line parallel to the X-axis of the coordinate system, which intersects the airfoil profile curve at a point. Obtain the X-axis coordinate value of this point. Connect this point with the zero point of the blade theoretical section coordinate system to obtain a line segment. Obtain the angle θ between this line segment and the X-axis. Take this point as the control point on the airfoil profile curve.

[0033] Based on the above positioning principle, this invention designs... Figures 4-6The positioning device shown includes a first positioning module 1, a second positioning module 3, a third positioning module 2, a fourth positioning module 4, and a base 5, wherein:

[0034] The first positioning module 1 for positioning the outer circle of the journal includes a first positioning groove with an upward opening that can accommodate the outer circle surface of the journal.

[0035] The second positioning module 3 for positioning the outer circle of the bushing includes a second positioning groove with an upward opening that can accommodate the outer circular surface of the bushing.

[0036] The third positioning module 2, used for positioning the section on the blade that has an angular requirement with respect to the compressor axis, is set between the first positioning module 1 and the second positioning module 3, and includes a ball head support and a floating support arranged coaxially. The ball head support and the floating support form a clamping space for the section on the blade that has an angular requirement with respect to the compressor axis. In this embodiment, the contact point between the floating support and the blade is the control point.

[0037] The fourth positioning module 4, used for positioning the inner hole of the rocker arm's inner ball joint, is located on the same side as the first positioning module 1, the second positioning module 3, and the third positioning module 2. It includes a support with an opening slot for accommodating the rocker arm and a horizontal slot for placing a pin. The pin passes through the inner hole of the rocker arm's inner ball joint, and both ends are placed within the horizontal slot. Figure 5 The BB section has an opening slot located between two support plates that make up the support. Each support plate has a horizontal slot in the horizontal direction. The opening slot is used to place the rocker arm (with an inner ball head). The pin passes through the inner ball head, and the two ends of the pin are placed in the horizontal slot respectively.

[0038] like Figure 7 The figure illustrates how the method for obtaining control points described above is applied to the design of the positioning device. Based on the positioning principle of the aforementioned positioning device, the center point of the rocker arm and the center point of the blade (i.e., the intersection of the blade axis and the blade section where the control point is located) are already determined. At this point, a limiting structure needs to be designed on the positioning device to limit the rotation direction of the blade around the axis of the rectifier blade assembly. Figure 7 Assuming the coordinate system X'O'Y' is the coordinate system of the positioning device, combined with... Figure 3 The process of obtaining control points in the theoretical section coordinate system of the blade involves first selecting a point on the Y' axis in the X'O'Y' coordinate system. A straight line parallel to the X' axis is then drawn through this point, intersecting the blade profile curve of the theoretical section at a single point. This point serves as the control point. Figure 5The contact point between the floating support and the blade on the positioning device is connected to the control point and point O' of the coordinate system X'O'Y' to obtain a straight line with an angle θ' with the X' axis. This straight line is the basis for designing the slot position and size of the third positioning module 2, as well as the positions of the ball head support and the floating support (i.e., by drawing and measuring to obtain the coordinate values ​​of the control points and the angle θ' on the blade profile curve, the third positioning module 2 is designed).

[0039] A three-dimensional schematic diagram of the positioning device is shown below. Figure 4 Through the journal and bushing outer circle of the rectifier blade assembly (such as...) Figure 2 Two support points define the axis of the rectifier blade assembly. This is achieved by placing a first positioning module 1 at the front and a second positioning module 3 at the rear of the base 5. The main structural feature of the first positioning module 1 and the second positioning module 3 is that each has an opening at its upper end (opening upwards), serving as a positioning slot. The width of the opening slot matches the outer diameter of the corresponding journal and bushing. The main consideration for using the opening slot structure is to facilitate the handling and placement of parts. A control point is set on the theoretical cross-section of the blade to limit the rotation direction of the blade around the axis, as shown in the figure. Figure 5 As shown in the AA view, a slot is cut in the middle of the third positioning module 2 to form a space for accommodating the blade. A fixed ball head support is installed at the upper part of the slot. The contact point between the ball head support and the blade is determined by the coordinates of the control point on the blade profile curve obtained during the design of the positioning device and the axis of the floating support. An adjustable-height floating support is installed at the lower part of the slot. The floating support is realized by the engagement of a ball head screw and a threaded hole on the third positioning module 2. Rotating the screw allows for the up and down adjustment of the floating support, thereby ensuring reliable positioning of the blade profile and the support point. A control point is set in the inner hole of the ball head of the rocker arm to limit the rotation direction of the rocker arm around the axis, as shown in the figure. Figure 5 As shown in the BB view, vertical positioning is achieved through the engagement of a pin with a horizontal slot on the support and the inner hole of the ball joint in the rocker arm. The horizontal slot on the support is an open straight slot, serving only as a vertical positioning device, without limiting its horizontal position, thus avoiding over-positioning issues. The final clamping state of the rectifier blade assembly on the positioning device is as follows. Figure 6 As shown.

[0040] Contents not described in detail in this specification are prior art known to those skilled in the art. Although illustrative specific embodiments of the invention have been described above to facilitate understanding by those skilled in the art, it should be understood that the invention is not limited to the scope of the specific embodiments. Various modifications are readily apparent to those skilled in the art as long as they fall within the spirit and scope of the invention as defined and determined by the appended claims, and all inventions utilizing the concept of this invention are protected.

Claims

1. A method for processing a rectifier blade assembly, comprising a positioning step and a drilling step, wherein the rectifier blade assembly mainly consists of a blade with a journal, a bushing, and a rocker arm with an inner ball head, wherein a cross-section on the blade has an angular requirement with the compressor axis, and the end face of the bushing serves as a reference surface for determining the position of the aforementioned cross-section on the blade, characterized in that, The positioning steps include: The step of locating the axis of the rectifier blade assembly is to determine the axis of the rectifier blade assembly by using the support points of the outer circle of the journal and the outer circle of the bushing in the rectifier blade assembly. The step of locating the axial position of the rectifier blade assembly is to define the axial position of the rectifier blade assembly by positioning the bushing end face in the rectifier blade assembly. The steps for determining the rotation direction of the blade are as follows: Select a section on the blade of the rectifier blade assembly that has an angular requirement with respect to the compressor axis, and select a point on the air profile curve of that section as a control point to limit the rotation direction of the blade around the axis of the rectifier blade assembly. The step of positioning the rocker arm rotation direction is to limit the rotation direction of the rocker arm around the axis of the rectifier blade assembly by setting a control point in the inner hole of the ball head inside the rocker arm.

2. The method for processing a rectifier blade assembly according to claim 1, characterized in that: In the step of locating the rotation direction of the blade, the coordinate point data of the theoretical cross section of the blade corresponding to the cross section with the angular requirement of the compressor axis is obtained. Based on the coordinate point data, the blade profile curve is drawn. A coordinate value is selected on the Y-axis of the theoretical cross section coordinate system of the blade, and a straight line parallel to the X-axis of the coordinate system is drawn to intersect the blade profile curve at a point. The X-axis coordinate value of the point is obtained. A line segment is obtained by connecting the point and the zero point of the theoretical cross section coordinate system of the blade. The angle θ between the line segment and the X-axis is obtained. The point is taken as the control point on the blade profile curve.

3. The method for processing a rectifier blade assembly according to claim 1, characterized in that: In the step of positioning the rotation direction of the rocker arm, a pin inserted into the inner hole of the ball head of the rocker arm is used as a control point to limit the rotation direction of the rocker arm around the axis of the rectifier blade assembly.

4. The method for processing a rectifier blade assembly according to claim 1, characterized in that, The drilling step is as follows: after completing the positioning step, a hole for the positioning pin is drilled on the surface of the rocker arm, and the axis of the hole intersects perpendicularly with the axis of the rectifier blade assembly.

5. A positioning device for the processing method of the rectifier blade assembly according to claim 1, characterized in that, include: A first positioning module (1) for positioning the outer circle of a journal, the first positioning module (1) includes a first positioning groove with an upward opening that can accommodate the outer circle surface of the journal. The second positioning module (3) for positioning the outer circle of the bushing includes a second positioning groove with an upward opening that can accommodate the outer circle surface of the bushing. The third positioning module (2) is used for positioning the section on the blade that has an angular requirement with respect to the compressor axis. The third positioning module (2) is set between the first positioning module (1) and the second positioning module (3), and includes a ball head support and a floating support arranged coaxially. The ball head support and the floating support form a clamping space for the section on the blade that has an angular requirement with respect to the compressor axis. The contact point between the ball head support or the floating support and the blade is the control point. The fourth positioning module (4) is used for positioning the inner hole of the ball head of the rocker arm. The fourth positioning module (4) is located on the same side as the first positioning module (1), the second positioning module (3) and the third positioning module (2), and includes a support. The support has an opening groove for accommodating the rocker arm and a horizontal groove for placing the pin. After the pin passes through the inner hole of the ball head of the rocker arm, both ends are placed in the horizontal groove.

6. The positioning device according to claim 5, characterized in that: The lower ends of the first positioning module (1), the second positioning module (3), the third positioning module (2) and the fourth positioning module (4) can all be detachably connected to the upper end of the base (5).

7. The positioning device according to claim 5, characterized in that: The size of the first positioning groove is consistent with the outer diameter of the journal, and the size of the second positioning groove is consistent with the outer diameter of the bushing.

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