Non-full-circle variable-curvature casing machining center adjusting method and analysis system

Abstract

The invention relates to the technical field of aeronautical manufacturing, and discloses a non-full-circle variable-curvature cartridge receiver machining center adjusting method and an analysis system, which can quickly realize the adjustment of a non-full-circle variable-curvature cartridge receiver machining center, enable the non-full-circle variable-curvature cartridge receiver machining center to coincide with the rotating center of a numerical control machine tool machining turntable, facilitate the high-precision machining of the non-full-circle variable-curvature cartridge receiver, and improve the machining precision of the non-full-circle variable-curvature cartridge receiver. The machining cycle can be shortened, the problems of high cost, poor universality and high development cost caused by the fact that a special tool needs to be designed can be solved, and manpower and material resources are saved.

Description

Technical Field

[0001] The invention relates to the technical field of aviation manufacturing, and discloses an adjustment method and an analysis system for a non-full-circle variable-curvature casing machining center. Background Art

[0002] As the structure of aircraft engine casings becomes more and more complex, non-circular casings are increasingly used in advanced models. Generally, the alignment of machining centers for non-circular variable curvature casings is done by designing special positioning tools, but the design of special tools is expensive and has poor versatility, thus wasting a lot of manpower and material resources, resulting in a long processing cycle and high development costs for aircraft engine casings. Summary of the invention

[0003] The purpose of the present invention is to provide a method and analysis system for adjusting the machining center of a non-circular variable curvature casing, which can quickly realize the machining center adjustment of the non-circular variable curvature casing, facilitate high-precision machining of the non-circular variable curvature casing, and can not only shorten the machining cycle, but also avoid the need to design special tooling, resulting in high costs, poor versatility, and high research and development costs, thereby saving manpower and material resources.

[0004] In order to achieve the above technical effects, the technical solution adopted by the present invention is:

[0005] A method for adjusting a non-circular variable curvature casing machining center, comprising:

[0006] The non-integral-circular variable-curvature casing is placed flat on a processing turntable of a numerically controlled machine tool, so that the axial direction of the non-integral-circular variable-curvature casing is perpendicular to the processing turntable surface; the cross-sectional shape of the non-integral-circular variable-curvature casing extends symmetrically from the center point of the cross-sectional shape to both sides, and the curvature of the extended part on each side increases or decreases smoothly in sequence;

[0007] Taking the rotation center of the machining turntable as the origin, a plane rectangular coordinate system is constructed on the machining turntable;

[0008] Marking the center point and two endpoints of the cross section of the non-circular variable curvature casing, translating the center point of the cross section of the non-circular variable curvature casing to the horizontal axis of the plane rectangular coordinate system, and adjusting the two endpoints to positions with equal distances from the origin, to obtain the outer edge contour of the non-circular variable curvature casing on the processing turntable;

[0009] At least four analysis points are randomly selected on the outer edge contour, a center coordinate is determined according to every three analysis points, and the center distance between any two center coordinates is obtained by analysis;

[0010] The midpoint position of the two circle center coordinates with the largest center-to-center distance is determined as the machining center of the non-circular variable curvature casing, and the position of the non-circular variable curvature casing on the machining turntable is adjusted according to the coordinate value of the midpoint position so that the machining center coincides with the origin of the machining turntable.

[0011] Furthermore, the method of adjusting the two endpoints to positions equidistant from the origin includes:

[0012] The cross-sectional center point of the non-circular variable curvature casing is kept on the horizontal axis of the plane rectangular coordinate system; the non-circular variable curvature casing is rotated with the cross-sectional center point as the rotation center, and the distance from the two endpoints to the origin is measured by the distance measuring mechanism of the CNC machine tool during the rotation process until the two endpoints are adjusted to be equal to the distance from the origin.

[0013] Furthermore, the method of determining a center coordinate according to every three analysis points includes: using the distance measuring mechanism of the CNC machine tool to measure and obtain the coordinate value of each analysis point, and using the least squares method to calculate and obtain the center coordinate corresponding to any three analysis points.

[0014] Furthermore, the distance measuring mechanism is one or more combinations of a dial indicator, a laser rangefinder, and an infrared rangefinder.

[0015] In order to achieve the above technical effects, the present invention also provides a non-circular variable curvature casing machining center analysis system, comprising:

[0016] A coordinate system construction module is used to construct a plane rectangular coordinate system on the processing turntable of the CNC machine tool with the rotation center of the processing turntable as the origin;

[0017] A coordinate value acquisition module is used to obtain the distances from the outer edge endpoints of the non-integral circular variable curvature casing and each analysis point to the origin by using a distance measuring mechanism; wherein the cross-sectional shape of the non-integral circular variable curvature casing extends symmetrically from the cross-sectional center point to both sides, and the curvature of the extended portion on each side increases or decreases smoothly in sequence; the non-integral circular variable curvature casing is placed flat on a processing turntable of a numerically controlled machine tool, and the axial direction of the non-integral circular variable curvature casing is perpendicular to the processing turntable table, and the cross-sectional center point of the non-integral circular variable curvature casing is located on the horizontal axis of the plane rectangular coordinate system; the analysis points are at least four points arbitrarily selected on the outer edge contour;

[0018] The circle center coordinate analysis module is used to analyze and obtain the circle center coordinates corresponding to the three analysis points according to the coordinate values ​​of each three analysis points;

[0019] A circle center distance analysis module, used for analyzing and obtaining the circle center distance corresponding to two circle center coordinates according to any two circle center coordinates;

[0020] The machining center determination module is used to determine the midpoint position of the two circle center coordinates with the largest center distance as the machining center of the non-full circle variable curvature casing.

[0021] Furthermore, in the coordinate value acquisition module, the method for adjusting the distances between the two endpoints and the origin to be equal includes: keeping the cross-sectional center point of the non-circular variable curvature casing located on the horizontal axis of the plane rectangular coordinate system; rotating the non-circular variable curvature casing with the cross-sectional center point as the rotation center, and using the distance measuring mechanism of the CNC machine tool to measure the distances from the two endpoints to the origin during the rotation process until the two endpoints are adjusted to be equal to the distances from the origin.

[0022] Furthermore, the distance measuring mechanism in the coordinate value acquisition module is a combination of one or more of a dial indicator, a laser rangefinder, and an infrared rangefinder.

[0023] Furthermore, in the circle center coordinate analysis module, the least square method is used to calculate and obtain the circle center coordinates corresponding to any three analysis points.

[0024] Compared with the prior art, the beneficial effects of the present invention are as follows: the present invention can quickly adjust the machining center of the non-circular variable curvature casing so that it coincides with the rotation center of the CNC machine tool machining turntable, thereby facilitating high-precision machining of the non-circular variable curvature casing, which can not only shorten the machining cycle, but also avoid the need to design special tooling, which causes high costs, poor versatility, and high research and development costs, thereby saving manpower and material resources. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a flow chart of the adjustment method of the non-full circle variable curvature casing machining center in the embodiment;

[0026] Figure 2 Schematic diagram of the positional relationship between the non-circular variable curvature casing and the processing turntable in the embodiment;

[0027] Figure 3 It is a structural block diagram of the analysis system of the non-circular variable curvature casing machining center in the embodiment;

[0028] Among them, 1. Non-circular variable curvature casing; 2. Processing turntable; 3. Coordinate system construction module; 4. Coordinate value acquisition module; 5. Center coordinate analysis module; 6. Center distance analysis module; 7. Processing center determination module. DETAILED DESCRIPTION

[0029] The present invention is further described in detail below in conjunction with the embodiments and drawings. However, it should not be understood that the scope of the above subject matter of the present invention is limited to the following embodiments, and all technologies realized based on the content of the present invention belong to the scope of the present invention.

[0030] Example

[0031] See also Figure 1-Figure 3 In this embodiment, a non-integral circular variable curvature casing 1 is taken as an example to explain in detail the process of the non-integral circular variable curvature casing 1 machining center adjustment method of the present invention. The cross-sectional shape of the non-integral circular variable curvature casing 1 in this embodiment extends symmetrically from the center point of the cross-sectional shape to both sides, and the curvature of the extended part on each side decreases smoothly in sequence. The specific steps are as follows:

[0032] Step 1: Place the non-circular variable curvature casing 1 flat on the processing turntable 2 of the CNC machine tool, so that the axial direction of the non-circular variable curvature casing 1 is perpendicular to the table surface of the processing turntable 2.

[0033] Step 2: With the rotation center of the processing turntable 2 as the origin, a plane rectangular coordinate system XOY is constructed on the processing turntable 2, wherein O is the rotation center of the processing turntable 2, OX is the horizontal axis, and OY is the vertical axis.

[0034] Step 3, marking the cross-sectional center point and two endpoints of the non-circular variable curvature casing 1, translating the cross-sectional center point of the non-circular variable curvature casing 1 to the horizontal axis of the plane rectangular coordinate system, and adjusting the two endpoints to positions equidistant from the origin, to obtain the outer edge contour of the non-circular variable curvature casing 1 on the processing turntable 2;

[0035] In this embodiment, the distance measuring mechanism is a micrometer, and the center point S1 (x S ,y S ) position coordinates (1120.77, 50.23), adjust the position of the cross-section center point S1 of the non-circular variable curvature casing 1 so that y S Until it reaches 0, the center point S1 of the cross section is located on the OX axis.

[0036] Then determine the upper end point position S2 and the lower end point position S3 of the outer edge of the non-circular variable curvature casing 1, and obtain the position coordinates (x S2 ,y S2 )、S3 position coordinates (x S3 ,y S3 ), calculate the distance from S2 to the origin O, and the distance from S3 to the origin O respectively; if the two distances are not equal, keep the position of the cross-section center point S1 unchanged, and adjust the position of the non-circular variable curvature casing 1 until the distance from S2 to the origin O is equal to the distance from S3 to the origin O.

[0037] Step 4: randomly select at least four analysis points on the outer edge contour, determine a circle center coordinate according to every three analysis points, and analyze and obtain the center distance between any two circle center coordinates;

[0038] In this embodiment, N (N≥4) analysis points are selected from the outer edge contour of the non-circular variable curvature casing 1, and the N analysis points are numbered 1, 2, ..., N in sequence; the center of the circle is determined based on three points, and every three analysis points are combined from the N analysis point numbers. Each combination can determine a center of the circle based on three points, and according to the coordinate value of each analysis point, the center coordinates C corresponding to every three analysis points can be calculated. i (x i ,y i ), where C i Represents the coordinates of the center of the i-th combination.

[0039] Then, all the obtained circle center coordinate values ​​can be combined in pairs to calculate the center distance L for each combination of two circle center coordinates. i,j , where x j ,y j are the horizontal and vertical coordinates of the center of the j-th combination respectively.

[0040] Regarding the calculation of the coordinates of the circle center, the present embodiment adopts the least square method, but other methods capable of calculating the corresponding circle center position through the coordinate values ​​of three points are also applicable to the present invention.

[0041] Step 5: Determine the midpoint position of the coordinates of the two circles with the largest center distance as the machining center of the non-circular variable curvature casing 1, and adjust the position of the non-circular variable curvature casing 1 on the machining turntable 2 according to the coordinate value of the midpoint position, so that the machining center coincides with the origin of the machining turntable 2;

[0042] In this embodiment, by sorting all the circle center distances calculated in step 4, the two circle center coordinates corresponding to the maximum circle center distance are obtained. According to the coordinate values ​​of the two circle center coordinates, the midpoint position coordinate value (x0, y0) of the two circle center coordinates can be obtained, and the midpoint position coordinate value is the reference machining center of the non-integral variable curvature casing 1. Based on the midpoint position coordinate value (x0, y0), the distance that the non-integral variable curvature casing 1 moves in the X-axis direction is determined to be |x0|, and the distance that moves in the Y-axis direction is |y0|, thereby achieving the purpose of moving the machining center of the non-integral variable curvature casing 1 to the rotation center of the machining turntable 2.

[0043] Through the adjustment method in this embodiment, the machining center adjustment of the non-circular variable curvature casing 1 can be quickly realized so that it coincides with the rotation center of the CNC machine tool machining turntable 2, thereby facilitating high-precision machining of the non-circular variable curvature casing 1. This not only shortens the machining cycle, but also avoids the problems of high cost, poor versatility, and high development cost caused by the need to design special tooling, thereby saving manpower and material resources.

[0044] In this embodiment, the distance measuring mechanism is one or more combinations of a dial indicator, a laser rangefinder, and an infrared rangefinder.

[0045] Based on the same inventive concept, this embodiment also provides a non-circular variable curvature casing 1 machining center analysis system, including:

[0046] A coordinate system construction module 3 is used to construct a plane rectangular coordinate system on the processing turntable 2 with the rotation center of the processing turntable 2 of the CNC machine tool as the origin;

[0047] The coordinate value acquisition module 4 is used to obtain the distances from the outer edge endpoints of the non-integral circular variable curvature casing 1 and each analysis point to the origin by using a distance measuring mechanism; wherein the cross-sectional shape of the non-integral circular variable curvature casing 1 extends symmetrically from the cross-sectional center point to both sides, and the curvature of the extended portion on each side increases or decreases smoothly in sequence; the non-integral circular variable curvature casing 1 is placed flat on the processing turntable 2 of the CNC machine tool, and the axial direction of the non-integral circular variable curvature casing 1 is perpendicular to the table surface of the processing turntable 2, and the cross-sectional center point of the non-integral circular variable curvature casing 1 is located on the horizontal axis of the plane rectangular coordinate system; the analysis points are at least four points arbitrarily selected on the outer edge contour;

[0048] The circle center coordinate analysis module 5 is used to analyze and obtain the circle center coordinates corresponding to the three analysis points according to the coordinate values ​​of each three analysis points;

[0049] A circle center distance analysis module 6, used for analyzing and obtaining the circle center distance corresponding to two circle center coordinates according to any two circle center coordinates;

[0050] The machining center determination module 7 is used to determine the midpoint position of the two circle center coordinates with the largest center distance as the machining center of the non-full circle variable curvature casing 1.

[0051] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for adjusting a non-circular variable curvature casing machining center, characterized in that: include: Place the non-circular variable curvature casing flat on the machining turntable of the CNC machine tool, so that the axial direction of the non-circular variable curvature casing is perpendicular to the machining turntable surface; The cross-sectional shape of the non-full-circle variable-curvature casing extends symmetrically from the center point of the cross-sectional area to both sides, and the curvature of the extended portion on each side increases or decreases smoothly in sequence; Taking the rotation center of the machining turntable as the origin, a plane rectangular coordinate system is constructed on the machining turntable; Marking the center point and two endpoints of the cross section of the non-circular variable curvature casing, translating the center point of the cross section of the non-circular variable curvature casing to the horizontal axis of the plane rectangular coordinate system, and adjusting the two endpoints to positions with equal distances from the origin, to obtain the outer edge contour of the non-circular variable curvature casing on the processing turntable; At least four analysis points are randomly selected on the outer edge contour, a center coordinate is determined according to every three analysis points, and the center distance between any two center coordinates is obtained by analysis; The midpoint position of the two circle center coordinates with the largest center-to-center distance is determined as the machining center of the non-circular variable curvature casing, and the position of the non-circular variable curvature casing on the machining turntable is adjusted according to the coordinate value of the midpoint position so that the machining center coincides with the origin of the machining turntable.

2. The method for adjusting a non-circular variable curvature casing machining center according to claim 1, characterized in that: The method of adjusting the two endpoints to positions equidistant from the origin includes: The cross-sectional center point of the non-circular variable curvature casing is kept on the horizontal axis of the plane rectangular coordinate system; the non-circular variable curvature casing is rotated with the cross-sectional center point as the rotation center, and the distance from the two endpoints to the origin is measured by the distance measuring mechanism of the CNC machine tool during the rotation process until the two endpoints are adjusted to be equal to the distance from the origin.

3. The method for adjusting a non-circular variable curvature casing machining center according to claim 1, characterized in that: The method for determining a center coordinate according to every three analysis points includes: using the distance measuring mechanism of the numerical control machine tool to measure and obtain the coordinate value of each analysis point, and using the least square method to calculate and obtain the center coordinate corresponding to any three analysis points.

4. The method for adjusting a non-circular variable curvature casing machining center according to claim 3, characterized in that: The distance measuring mechanism is one or more combinations of a dial indicator, a laser distance meter, and an infrared distance meter.

5. A non-circular variable curvature casing machining center analysis system, characterized in that: include: A coordinate system construction module is used to construct a plane rectangular coordinate system on the processing turntable of the CNC machine tool with the rotation center of the processing turntable as the origin; A coordinate value acquisition module is used to obtain the distances from the outer edge endpoints of the non-integral circular variable curvature casing and each analysis point to the origin by using a distance measuring mechanism; wherein the cross-sectional shape of the non-integral circular variable curvature casing extends symmetrically from the cross-sectional center point to both sides, and the curvature of the extended portion on each side increases or decreases smoothly in sequence; the non-integral circular variable curvature casing is placed flat on a processing turntable of a numerically controlled machine tool, and the axial direction of the non-integral circular variable curvature casing is perpendicular to the processing turntable table, and the cross-sectional center point of the non-integral circular variable curvature casing is located on the horizontal axis of the plane rectangular coordinate system; the analysis points are at least four points arbitrarily selected on the outer edge contour; The circle center coordinate analysis module is used to analyze and obtain the circle center coordinates corresponding to the three analysis points according to the coordinate values ​​of each three analysis points; A circle center distance analysis module, used for analyzing and obtaining the circle center distance corresponding to two circle center coordinates according to any two circle center coordinates; The machining center determination module is used to determine the midpoint position of the two circle center coordinates with the largest center distance as the machining center of the non-full circle variable curvature casing.

6. The non-circular variable curvature casing machining center analysis system according to claim 5 is characterized in that: In the coordinate value acquisition module, the method for adjusting the distances between the two endpoints and the origin to be equal includes: keeping the cross-sectional center point of the non-circular variable curvature casing located on the horizontal axis of the plane rectangular coordinate system; rotating the non-circular variable curvature casing with the cross-sectional center point as the rotation center, and using the distance measuring mechanism of the CNC machine tool to measure the distances from the two endpoints to the origin during the rotation process until the two endpoints are adjusted to be equal to the distances from the origin.

7. The non-circular variable curvature casing machining center analysis system according to claim 5, characterized in that: The distance measuring mechanism in the coordinate value acquisition module is one or more combinations of a dial indicator, a laser rangefinder, and an infrared rangefinder.

8. The non-circular variable curvature casing machining center analysis system according to claim 5, characterized in that: In the circle center coordinate analysis module, the least square method is used to calculate and obtain the circle center coordinates corresponding to any three analysis points.

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