Rapid positioning device for milling of large rotary thin-shell structural member and use method of rapid positioning device

Abstract

The invention discloses a quick positioning device for milling a large rotary thin-shell structural member and a use method of the quick positioning device. The quick positioning device comprises a supporting base, a seat ring positioning frame, 2n seat ring positioning connecting pieces and a positioning bracket, the method comprises the steps that (1) the supporting base is fixed to a working platform, and the positioning support is installed on a supporting plane; 2) obtaining coordinates of any three points at the through hole I of the supporting base; 3) fitting a circle center coordinate through the three-point coordinates to obtain a center coordinate of the bottom surface of the to-be-processed large rotary thin shell; 4) acquiring vertex coordinates of the positioning bracket; (5) the seat ring positioning frame and the large rotary thin shell to be machined are fixedly connected together through a seat ring positioning connecting piece; (6) the seat ring positioning frame and the large rotary thin shell to be machined are installed on the supporting base, and part pressing is conducted through a pressing plate; and (7) determining the coordinates of a machining starting point, and starting milling. The method is fast, effective and high in practicability, machining vibration is effectively reduced, and the machining surface quality is improved.

Description

Technical Field

[0001] This invention relates to the field of clamping and positioning large thin-shell structural components, and specifically to a rapid positioning device and its method of use for milling large rotating thin-shell structural components. Background Technology

[0002] Thin-shell structures are thin-walled structures with curved surfaces. Based on the form in which the curved surface is formed, they are classified into cylindrical shells, dome-shaped thin shells, hyperbolic flat shells, and hyperbolic paraboloid shells, etc. These shells fully utilize the strength of the material while integrating load-bearing and enclosure functions. In practical engineering, the cutting and combination of spatial curved surfaces can also be used to create uniquely shaped and novel buildings that can adapt to various planar surfaces. The advantage of thin-shell structures is that they can evenly distribute the pressure on all parts of the object, reducing the stress on the structure. Many building roofs utilize the principles of thin-shell structures.

[0003] Currently, large thin-shell structural components are widely used in key industrial fields such as automobiles, ships, and aerospace, especially large rotating thin-shell structural components, which have an even wider range of applications and broader prospects. However, the irregular structure of large rotating thin-shell structural components makes the positioning operation during milling more cumbersome, which is not conducive to improving production efficiency. This is because most of these structural components are produced by assembling and welding first, followed by machining. This results in partial thermal deformation of the thin shell during the welding process, leading to thermal errors. Consequently, subsequent milling cannot use the unmachined surface as a reference; it can only use the center of the bottom rotating ring on the worktable as a reference for positioning the upper surface for machining. Traditional methods involve milling a reference surface on the side to find the upper surface machining position, which requires leaving machining allowance, increasing machining time and potentially increasing the overall weight of the structural component, exceeding design requirements. Alternatively, using scribing lines to find the upper surface machining position is time-consuming, labor-intensive, inefficient, and has poor accuracy. Summary of the Invention

[0004] The purpose of this invention is to provide a rapid positioning device and its method for milling large rotating thin-shell structural parts.

[0005] The technical solution adopted to achieve the purpose of this invention is as follows: a rapid positioning device for milling large rotating thin shell structural parts, comprising: a support base, a seat ring positioning frame, 2n seat ring positioning connectors, and a positioning bracket, wherein n is a positive integer.

[0006] The support base includes a support plane and a positioning base.

[0007] A positioning base is provided at the center of the top surface of the supporting plane.

[0008] The support plane has several U-shaped notches for fixing the support base to the working platform.

[0009] The positioning base has a slot on one side for installing a positioning bracket.

[0010] The support base has a through hole I at its center, and a positioning frame groove is provided at the top of the through hole I.

[0011] The seat ring positioning bracket is adapted to the positioning bracket slot of the support base.

[0012] The seat ring positioning frame has a through hole II at its center, and a connecting plate for installing the seat ring positioning connector is provided at the bottom of the through hole II.

[0013] The through hole II of the seat ring positioning frame is adapted to the rotating seat ring of the large rotating thin shell to be processed.

[0014] The seat ring positioning connector has a through hole III parallel to the web plate on one side.

[0015] n seat ring positioning connectors are installed on the connecting plate of the seat ring positioning frame, and n seat ring positioning connectors are installed on the rotating seat ring of the large rotating thin shell to be processed. The seat ring positioning frame and the corresponding two seat ring positioning connectors on the large rotating thin shell to be processed are fixedly connected together by bolts.

[0016] Furthermore, hooks are installed on the support plane for hoisting the support base.

[0017] Furthermore, the positioning bracket is mounted on the support plane by bolts.

[0018] Furthermore, the positioning bracket is mounted on the support plane via a pressure plate.

[0019] Furthermore, the support base is fixed to the working platform by T-bolts.

[0020] Furthermore, the positioning frame groove of the support base is provided with a guide surface that matches the inclined surface of the seat ring positioning frame.

[0021] A positioning method using the above-mentioned device includes the following steps:

[0022] 1) Fix the support base on the work platform and install the positioning bracket on the support plane.

[0023] 2) Control the machine tool to obtain the coordinates of any three points at the through hole I of the support base, and denot them as A1 = (X... A1 ,Y A1 Z A ), A2=(X A2 ,Y A2 Z A ), A3 = (X A3 ,Y A3 ZA ).

[0024] 3) Fit the coordinates of the center of the circle o = (X...) using the coordinates of three points. o1 ,Y o1 Z o1 Let the height of the large rotating thin shell to be processed be Z1, and then obtain the center coordinates of the bottom surface of the large rotating thin shell to be processed, P1 = (X1, Y1, Z1), where X1 = X o1 Y1 = Y o1 .

[0025] 4) Obtain the coordinates of the apex of the positioning bracket, P2 = (X2, Y2, Z2), by moving the main spindle to drive the online probe.

[0026] 5) Use the seat ring positioning connector to fix the seat ring positioning frame and the large rotating thin shell to be processed together.

[0027] 6) Install the seat ring positioning frame and the large rotating thin shell to be processed onto the support base, and clamp the parts with the pressure plate.

[0028] 7) Based on the relative positions (X,Y,Z) of the bottom ring and the points to be machined on the top surface of the large rotating thin shell to be machined, determine the coordinates of the starting point P3 = (X3,Y3,Z3) and start the milling process.

[0029] Furthermore, the circle center coordinates o = (X) are fitted using three-point coordinates. o1 ,Y o1 Z o1 The steps are as follows:

[0030] 3.1) Set A1 = (X A1 ,Y A1 Z A ), A2=(X A2 ,Y A2 Z A ), A3 = (X A3 ,Y A3 Z A Substitute the constant value into formula (1) to obtain the constant value.

[0031] x 2 +y 2 +Dx+Ey+F=0 (1)

[0032] In the formula, D, E, and F are all constant values.

[0033] 3.2) The coordinates of the center and the radius are calculated based on the constant values, as shown below:

[0034]

[0035] In the formula, o is the coordinate of the center of the circle, and r is the radius.

[0036] Furthermore, the formula for determining the machining start point coordinates P3 = (X3, Y3, Z3) based on the relative positions (X, Y, Z) of the bottom surface of the large rotating thin shell to be machined and the machining point on the upper surface is as follows:

[0037] P3=(X2-X1+X,Y2-Y1+Y,Z2-Z1+Z)=(X3,Y3,Z3) (4).

[0038] Furthermore, the method of installing the seat ring positioning frame and the large rotating thin shell to be processed onto the support base includes hoisting.

[0039] The technical effects of this invention are undeniable. This invention provides a rapid positioning method for milling large rotating thin-shell parts, effectively reducing machining vibration and improving the surface quality. This method is quick, effective, and highly practical. The method of this invention can effectively improve the positioning efficiency of large rotating thin-shell structural parts with the bottom rotation center as the reference for the new machining origin, effectively reduce machining vibration, improve the milled surface quality, and is adaptable to products with different rotation radii, thus expanding the applicability of the invention and reducing usage costs.

[0040] This invention effectively improves the positioning efficiency of large rotating thin-shell structural parts with the bottom rotation center as the reference for the new machining origin. The structure of this invention effectively improves the clamping efficiency of large rotating thin-shell structural parts. When clamped with a pressure plate, this invention effectively reduces machining vibration of large rotating thin-shell structural parts and improves the milled surface quality. By matching different seat ring positioning frames, this invention can be adapted to large rotating thin-shell shells with different rotation axis radii.

[0041] This invention solves the problem of time-consuming, labor-intensive, and low-precision determination of the machine tool starting point coordinates with the bottom seat ring as the reference and the machining area on the upper surface of the large thin shell by means of coordinate transformation through the support base and positioning bracket. The adaptability of this invention is enhanced by the seat ring positioning bracket. The inclined ring in the positioning base of the seat ring positioning bracket and the support base has the ability to guide and reduce machining vibration. Attached Figure Description

[0042] Figure 1 This is a schematic diagram of the overall quick clamping and positioning device of the present invention;

[0043] Figure 2 This is a cross-sectional schematic diagram of the device of the present invention;

[0044] Figure 3 This is a schematic diagram of the installation scheme of the present invention;

[0045] Figure 4This is a schematic diagram of the usage process of the present invention;

[0046] In the figure, there are: support base 1, support plane 101, positioning base 102, U-shaped notch 103, slot 104, through hole I 105, positioning frame slot 106, seat ring positioning frame 2, through hole II 201, connecting plate 202, seat ring positioning connector 3, positioning bracket 4, and large rotating thin shell to be processed 5. Detailed Implementation

[0047] The present invention will be further described below with reference to embodiments, but it should not be construed that the scope of the present invention is limited to the following embodiments. Various substitutions and modifications made based on ordinary technical knowledge and common practices in the art without departing from the above-described technical concept of the present invention should be included within the scope of protection of the present invention.

[0048] Example 1:

[0049] See Figures 1 to 4 A rapid positioning device for milling large rotating thin-shell structural parts includes: a support base 1, a seat ring positioning frame 2, 2n seat ring positioning connectors 3, and a positioning bracket 4, where n is a positive integer.

[0050] The support base 1 includes a support plane 101 and a positioning base 102.

[0051] A positioning base 102 is provided at the center of the top surface of the support plane 101.

[0052] The support plane 101 is provided with several U-shaped notches 103 for fixing the support base 1 to the working platform.

[0053] The positioning base 102 has a slot 104 on one side for installing the positioning bracket 4.

[0054] The support base 1 has a through hole I105 at its center, and a positioning frame groove 106 is provided at the top of the through hole I105.

[0055] The seat ring positioning frame 2 is adapted to the positioning frame groove 106 of the support base 1.

[0056] The seat ring positioning frame 2 has a through hole II201 at its center, and a connecting plate 202 for installing the seat ring positioning connector 3 is provided at the bottom of the through hole II201.

[0057] The through hole II201 of the seat ring positioning frame 2 is adapted to the rotating seat ring of the large rotating thin shell 5 to be processed.

[0058] The seat ring positioning connector 3 has a through hole III parallel to the web plate on one side of the web plate.

[0059] n seat ring positioning connectors 3 are installed at the connecting plate 202 of the seat ring positioning frame 2. The n seat ring positioning connectors 3 are installed on the rotating seat ring of the large rotating thin shell 5 to be processed. The seat ring positioning frame 2 and the two corresponding seat ring positioning connectors 3 on the large rotating thin shell 5 to be processed are fixedly connected together by bolts.

[0060] Example 2:

[0061] A rapid positioning device for milling large rotating thin-shell structural parts is described in Embodiment 1. Further, a hook is installed on the support plane 101 for hoisting the support base 1.

[0062] Example 3:

[0063] A rapid positioning device for milling large rotating thin-shell structural parts, the main technical contents of which are described in any one of Embodiments 1 to 2, further wherein the positioning bracket 4 is installed on the support plane by bolts.

[0064] Example 4:

[0065] A rapid positioning device for milling large rotating thin-shell structural parts, the main technical contents of which are described in any one of Embodiments 1 to 3, further wherein the positioning bracket 4 is mounted on the support plane by a pressure plate.

[0066] Example 5:

[0067] A rapid positioning device for milling large rotating thin-shell structural parts, the main technical contents of which are described in any one of Embodiments 1 to 4, further wherein the support base 1 is fixed to the working platform by T-bolts.

[0068] Example 6:

[0069] A rapid positioning device for milling large rotating thin-shell structural parts, the main technical contents of which are described in any one of embodiments 1 to 5. Furthermore, the positioning frame groove 106 of the support base 1 is provided with a guide surface that is adapted to the inclined surface of the seat ring positioning frame 2.

[0070] Example 7:

[0071] A positioning method for the device described in any one of embodiments 1-6 includes the following steps:

[0072] 1) Fix the support base on the work platform and install the positioning bracket on the support plane.

[0073] 2) Control the machine tool to obtain the coordinates of any three points at the through hole I of the support base, and denot them as A1 = (X... A1 ,Y A1 Z A ), A2=(X A2 ,YA2 Z A ), A3 = (X A3 ,Y A3 Z A ).

[0074] 3) Fit the coordinates of the center of the circle o = (X...) using the coordinates of three points. o1 ,Y o1 Z o1 Let the height of the large rotating thin shell to be processed be Z1, and then obtain the center coordinates of the bottom surface of the large rotating thin shell to be processed, P1 = (X1, Y1, Z1), where X1 = X o1 Y1 = Y o1 .

[0075] 4) Obtain the coordinates of the apex of the positioning bracket, P2 = (X2, Y2, Z2), by moving the main spindle to drive the online probe.

[0076] 5) Use the seat ring positioning connector to fix the seat ring positioning frame and the large rotating thin shell to be processed together.

[0077] 6) Install the seat ring positioning frame and the large rotating thin shell to be processed onto the support base, and clamp the parts with the pressure plate.

[0078] 7) Based on the relative positions (X,Y,Z) of the bottom ring and the points to be machined on the top surface of the large rotating thin shell to be machined, determine the coordinates of the starting point P3 = (X3,Y3,Z3) and start the milling process.

[0079] Example 8:

[0080] A rapid positioning method for milling large rotating thin-shell structural parts, the main technical content of which is described in Example 7, further comprising fitting the center coordinates o = (X...) using three-point coordinate fitting. o1 ,Y o1 Z o1 The steps are as follows:

[0081] 3.1) Set A1 = (X A1 ,Y A1 Z A ), A2=(X A2 ,Y A2 Z A ), A3 = (X A3 ,Y A3 Z A Substitute the constant value into formula (1) to obtain the constant value.

[0082] x 2 +y 2 +Dx+Ey+F=0 (1)

[0083] In the formula, D, E, and F are all constant values.

[0084] 3.2) The coordinates of the center and the radius are calculated based on the constant values, as shown below:

[0085]

[0086] In the formula, o is the coordinate of the center of the circle, and r is the radius.

[0087] Example 9:

[0088] A rapid positioning method for milling large rotating thin-shell structural parts, the main technical contents of which are described in any one of Embodiments 7 to 8, further wherein the calculation formula for determining the machining start point coordinates P3 = (X3, Y3, Z3) based on the relative positions (X, Y, Z) of the bottom surface seat ring and the machining point on the upper surface of the large rotating thin-shell to be machined is as follows:

[0089] P3=(X2-X1+X,Y2-Y1+Y,Z2-Z1+Z)=(X3,Y3,Z3) (4).

[0090] Example 10:

[0091] A rapid positioning method for milling large rotating thin-shell structural components is provided. The main technical contents are described in any one of embodiments 7 to 9. Furthermore, the method of installing the seat ring positioning frame and the large rotating thin-shell to be processed onto the support base includes hoisting.

[0092] Example 11:

[0093] See Figures 1 to 4 A rapid positioning device for milling large rotating thin-shell structural parts includes: a support base 1, a seat ring positioning frame 2, eight seat ring positioning connectors 3, and a positioning bracket 4.

[0094] The support base 1 includes a support plane 101 and a positioning base 102.

[0095] A positioning base 102 is provided at the center of the top surface of the support plane 101.

[0096] The support plane 101 is provided with several U-shaped notches 103 for fixing the support base 1 to the working platform.

[0097] The positioning base 102 has a slot 104 on one side for installing the positioning bracket 4.

[0098] The positioning bracket 4 is a cuboid structure with a positioning plane at one end.

[0099] The support base 1 has a through hole I105 at its center, and a positioning frame groove 106 is provided at the top of the through hole I105.

[0100] The inner surface of the through hole I105 is machined to a certain precision.

[0101] The seat ring positioning bracket 2 is a boss-shaped ring used to accommodate the size mismatch between the support base and the rotating seat ring of the large rotating thin shell structure.

[0102] The seat ring positioning frame 2 is adapted to the positioning frame groove 106 of the support base 1.

[0103] The seat ring positioning frame 2 has a through hole II201 at its center, and a connecting plate 202 for installing the seat ring positioning connector 3 is provided at the bottom of the through hole II201.

[0104] The through hole II201 of the seat ring positioning frame 2 is adapted to the rotating seat ring of the large rotating thin shell 5 to be processed.

[0105] The seat ring positioning connector 3 has a through hole III parallel to the web plate on one side of the web plate.

[0106] n seat ring positioning connectors 3 are installed at the connecting plate 202 of the seat ring positioning frame 2. The n seat ring positioning connectors 3 are installed on the rotating seat ring of the large rotating thin shell 5 to be processed. The seat ring positioning frame 2 and the two corresponding seat ring positioning connectors 3 on the large rotating thin shell 5 to be processed are fixedly connected together by bolts.

[0107] Example 12:

[0108] A rapid positioning device for milling large rotating thin-shell structural parts is described in Embodiment 11. Further, a hook is installed on the support plane 101 for hoisting the support base 1.

[0109] Example 13:

[0110] A rapid positioning device for milling large rotating thin-shell structural parts, the main technical contents of which are described in any one of Embodiments 11 to 12, further wherein the positioning bracket 4 is installed on the support plane by bolts.

[0111] Example 14:

[0112] A rapid positioning device for milling large rotating thin-shell structural parts, the main technical contents of which are described in any one of embodiments 11 to 13, further wherein the positioning bracket 4 is mounted on the support plane by a pressure plate.

[0113] Example 15:

[0114] A rapid positioning device for milling large rotating thin-shell structural parts, the main technical contents of which are described in any one of embodiments 11 to 14, further wherein the support base 1 is fixed to the working platform by T-bolts.

[0115] Example 16:

[0116] A rapid positioning device for milling large rotating thin-shell structural parts, the main technical contents of which are described in any one of embodiments 11 to 15, further wherein the positioning frame groove 106 of the support base 1 is provided with a guide surface adapted to the inclined surface of the seat ring positioning frame 2.

[0117] Example 17:

[0118] A positioning method for the device described in any one of Application Embodiments 11-16 includes the following steps:

[0119] 1) Fix the support base on the work platform and install the positioning bracket on the support plane.

[0120] 2) Control the machine tool to obtain the coordinates of any three points at the through hole I of the support base, and denot them as A1 = (X... A1 ,Y A1 Z A ), A2=(X A2 ,Y A2 Z A ), A3 = (X A3 ,Y A3 Z A ).

[0121] 3) Fit the coordinates of the center of the circle o = (X...) using the coordinates of three points. o1 ,Y o1 Z o1 Let the height of the large rotating thin shell to be processed be Z1, and then obtain the center coordinates of the bottom surface of the large rotating thin shell to be processed, P1 = (X1, Y1, Z1), where X1 = X o1 Y1 = Y o1 .

[0122] 4) Obtain the coordinates of the apex of the positioning bracket, P2 = (X2, Y2, Z2), by moving the main spindle to drive the online probe.

[0123] 5) Use the seat ring positioning connector to fix the seat ring positioning frame and the large rotating thin shell to be processed together.

[0124] 6) Install the seat ring positioning frame and the large rotating thin shell to be processed onto the support base, and clamp the parts with the pressure plate.

[0125] 7) Based on the relative positions (X,Y,Z) of the bottom ring and the points to be machined on the top surface of the large rotating thin shell to be machined, determine the coordinates of the starting point P3 = (X3,Y3,Z3) and start the milling process.

[0126] Example 18:

[0127] A rapid positioning method for milling large rotating thin-shell structural parts, the main technical content of which is described in Example 17, further comprising fitting the center coordinates o = (X) using three-point coordinate fitting. o1 ,Y o1 Z o1 The steps are as follows:

[0128] 3.1) Set A1 = (X A1 ,Y A1 Z A ), A2=(X A2 ,Y A2 Z A ), A3 = (X A3 ,Y A3 Z A Substitute the constant value into formula (1) to obtain the constant value.

[0129] x 2 +y 2 +Dx+Ey+F=0 (1)

[0130] In the formula, D, E, and F are all constant values.

[0131] 3.2) The coordinates of the center and the radius are calculated based on the constant values, as shown below:

[0132]

[0133]

[0134] In the formula, o is the coordinate of the center of the circle, and r is the radius.

[0135] Example 19:

[0136] A rapid positioning method for milling large rotating thin-shell structural parts, the main technical contents of which are described in any one of Embodiments 17 and 18, further wherein the calculation formula for determining the machining start point coordinates P3 = (X3, Y3, Z3) based on the relative positions (X, Y, Z) of the bottom surface seat ring and the machining point on the upper surface of the large rotating thin-shell to be machined is as follows:

[0137] P3=(X2-X1+X,Y2-Y1+Y,Z2-Z1+Z)=(X3,Y3,Z3) (4).

[0138] Example 20:

[0139] A rapid positioning method for milling large rotating thin-shell structural components is provided. The main technical contents are described in any one of Embodiments 17 to 19. Furthermore, the method of installing the seat ring positioning frame and the large rotating thin-shell to be processed onto the support base includes hoisting.

[0140] Example 21:

[0141] See Figures 1 to 4 A rapid positioning device for milling large rotating thin-shell structural parts and its application method, the main technical contents of which include:

[0142] A rapid positioning device for milling large rotating thin-shell structural parts includes a support base 1, a positioning base 102, a support plane 101, a seat ring positioning frame 2, a seat ring positioning connector 3, and a positioning bracket 4.

[0143] The support base 1 includes a positioning base 102 and a support plane 101. The support plane has a U-shaped notch and is equipped with a hook. The positioning base is hollow and its inner surface is machined to a certain precision.

[0144] The seat ring positioning bracket 2 is a boss-shaped ring used to accommodate the size mismatch between the support base and the rotating seat ring of the large rotating thin shell structure.

[0145] The positioning bracket 4 is a cuboid structure with a positioning plane at one end, which is installed on the support plane by means of bolts or pressure plates.

[0146] The seat ring positioning connector 3 has a through hole, and the two seat ring positioning connectors 3 are connected by bolts to clamp and fix the seat ring of the large rotating thin shell structure.

[0147] A rapid positioning method for milling large rotating thin-shell structural parts includes the following steps: installing a quick-mount fixture - positioning and clamping the workpiece - positioning the milling origin based on the quick-mount fixture - milling.

[0148] Example 22:

[0149] See Figures 1 to 4 A rapid positioning device for milling large rotating thin-shell structural parts and its application method, the main technical contents of which include:

[0150] A rapid positioning method for milling large rotating thin-shell structural parts includes the following steps;

[0151] 1) Place the support base 1 on the machine tool work platform and tighten it with T-bolts. The support base 1 includes a support plane 101 and a positioning base 102. The support plane has a U-shaped notch and is equipped with a pull hook. The positioning base is hollow and the inner surface of the ring is machined to a certain precision.

[0152] 2) Install the positioning bracket 4 on the support base 1. The support base has a groove on one side for assembling and positioning with the positioning bracket 4, and is pressed by a pressure plate.

[0153] 3) Control the machine tool to obtain the coordinates of any 3 points on the middle ring of the positioning base 102, such as... Figure 3 As shown, the machine tool spindle is equipped with an online probe, which can quickly obtain the coordinates of the measurement points, namely A1(X). A1 ,Y A1 Z A ),A2(X A2 ,Y A2 Z A ),A3(X A3 ,Y A3 Z A ).

[0154] Substitute into the following formula

[0155] x 2 +y 2 +Dx+Ey+F=0 (1)

[0156] Find the constant values ​​of D, E, and F, and then substitute them into the following formula.

[0157]

[0158] Find the radius r and the coordinates of the center o.

[0159] Finally, the center coordinates o(X) of the circle are obtained by fitting the coordinates of three points. o1 ,Y o1 Z o1 ).

[0160] 4) Further, by moving the main spindle to drive the online probe to the positioning bracket 4, the edge coordinates of the positioning bracket 4 are measured respectively, thereby obtaining the vertex coordinates P2(X2,Y2,Z2), and thus obtaining the relative positions of points P1 and P2.

[0161] 5) The seat ring positioning frame 2 and the large rotating thin shell 5 to be processed are connected and fixed together by the seat ring positioning connector 3.

[0162] 6) The OEM part with seat ring positioning frame is installed into the support base by means of hoisting or other methods. The positioning base 102 in the support base 1 has a guide surface that can fit with the inclined surface on the seat ring positioning frame 2, so that the part can be quickly and accurately installed on the support base and the part is pressed by the pressure plate.

[0163] 7) The relative positions (X, Y, Z) of the bottom ring and the machining point on the top surface of the large rotating thin shell can be known from the design drawing. The coordinates of P3 can be calculated by the following formula.

[0164] P3=(X2-X1+X,Y2-Y1+Y,Z2-Z1+Z)=(X3,Y3,Z3)(4)

[0165] 8) Determine the starting point coordinates of the machining process using the P3 coordinates and begin milling.

[0166] This embodiment solves the problem of time-consuming, labor-intensive, and low-precision determination of the machine tool starting point coordinates with the bottom seat ring as the reference and the machining area on the upper surface of the large thin shell by means of coordinate transformation through the support base and positioning bracket. The seat ring positioning bracket enhances the adaptability of the invention. The inclined ring in the positioning base of the seat ring positioning bracket and the support base has the ability to guide and reduce machining vibration.

Claims

1. A rapid positioning device for milling large rotating thin-shell structural parts, characterized in that, include: Support base (1), seat ring positioning frame (2), 2n seat ring positioning connectors (3), positioning bracket (4), where n is a positive integer; The support base (1) includes a support plane (101) and a positioning base (102); A positioning base (102) is provided at the center of the top surface of the supporting plane (101); The support plane (101) is provided with several U-shaped notches (103) for fixing the support base (1) on the working platform; The positioning base (102) has a slot (104) on one side for installing the positioning bracket (4); The support base (1) has a through hole I (105) at its center, and a positioning frame groove (106) is provided at the top of the through hole I (105); The seat ring positioning frame (2) is adapted to the positioning frame groove (106) of the support base (1). The seat ring positioning frame (2) has a through hole II (201) at its center, and a connecting plate (202) for installing the seat ring positioning connector (3) is provided at the bottom of the through hole II (201); The through hole II (201) of the seat ring positioning frame (2) is adapted to the rotating seat ring of the large rotating thin shell (5) to be processed; The seat ring positioning connector (3) has a through hole III parallel to the web plate on one side of the web plate; n seat ring positioning connectors (3) are installed on the connecting plate (202) of the seat ring positioning frame (2). The n seat ring positioning connectors (3) are installed on the rotating seat ring of the large rotating thin shell (5) to be processed. The two corresponding seat ring positioning connectors (3) on the seat ring positioning frame (2) and the large rotating thin shell (5) to be processed are fixedly connected together by bolts.

2. The rapid positioning device for milling large rotating thin-shell structural parts according to claim 1, characterized in that, Hooks are installed on the support plane (101) for hoisting the support base (1).

3. The rapid positioning device for milling large rotating thin-shell structural parts according to claim 1, characterized in that, The positioning bracket (4) is installed on the support plane by bolts.

4. The rapid positioning device for milling large rotating thin-shell structural parts according to claim 1, characterized in that, The positioning bracket (4) is installed on the support plane by a pressure plate.

5. The rapid positioning device for milling large rotating thin-shell structural parts according to claim 1, characterized in that, The support base (1) is fixed to the working platform by T-bolts.

6. The rapid positioning device for milling large rotating thin-shell structural parts according to claim 1, characterized in that, The positioning slot (106) of the support base (1) is provided with a guide surface that is adapted to the inclined surface of the seat ring positioning frame (2).

7. A positioning method using the apparatus according to any one of claims 1 to 6, characterized in that, Includes the following steps: 1) Fix the support base on the work platform and install the positioning bracket on the support plane; 2) Control the machine tool to obtain the coordinates of any three points at the through hole I of the support base, and denot them as A1 = (X... A1 ,Y A1 Z A ), A2=(X A2 ,Y A2 Z A ), A3 = (X A3 ,Y A3 Z A ); 3) Fit the coordinates of the center of the circle o = (X...) using the coordinates of three points. o1 ,Y o1 Z o1 Let the height of the large rotating thin shell to be processed be Z1, and then obtain the center coordinates of the bottom surface of the large rotating thin shell to be processed, P1 = (X1, Y1, Z1), where X1 = X o1 Y1 = Y o1 ; 4) Obtain the coordinates of the positioning bracket vertex P2 = (X2, Y2, Z2) by moving the main spindle to drive the online probe; 5) Use the seat ring positioning connector to fix the seat ring positioning frame and the large rotating thin shell to be processed together; 6) Install the seat ring positioning frame and the large rotating thin shell to be processed onto the support base, and clamp the parts with the pressure plate; 7) Based on the relative positions (X,Y,Z) of the bottom ring and the points to be machined on the top surface of the large rotating thin shell to be machined, determine the coordinates of the starting point P3 = (X3,Y3,Z3) and start the milling process.

8. The rapid positioning method for milling large rotating thin-shell structural parts according to claim 7, characterized in that, The center coordinates o = (X) are obtained by fitting the coordinates of three points. o1 ,Y o1 Z o1 The steps are as follows: 3.1) Set A1 = (X A1 ,Y A1 Z A ), A2=(X A2 ,Y A2 Z A ), A3 = (X A3 ,Y A3 Z A Substituting into formula (1), the constant value is calculated; x 2 +y 2 +Dx+Ey+F=0 (1) In the formula, D, E, and F are all constant values; 3.2) The coordinates of the center and the radius are calculated based on the constant values, as shown below: In the formula, o is the coordinate of the center of the circle, and r is the radius.

9. A rapid positioning method for milling large rotating thin-shell structural parts according to claim 7, characterized in that, The formula for determining the machining start point coordinates P3 = (X3, Y3, Z3) based on the relative positions (X, Y, Z) of the bottom bearing ring and the machining point on the upper surface of the large rotating thin shell to be machined is as follows: P3=(X2-X1+X,Y2-Y1+Y,Z2-Z1+Z)=(X3,Y3,Z3) (4).

10. A rapid positioning method for milling large rotating thin-shell structural parts according to claim 7, characterized in that, The method of installing the seat ring positioning frame and the large rotating thin shell to be processed onto the support base includes hoisting.

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