Milling machine machining coordinate system establishing method for special-shaped part with branch pipe nozzle

Abstract

The invention provides a milling machine machining coordinate system establishing method for a special-shaped part with a branch pipe nozzle, and belongs to the technical field of forging. In order to solve the problems that when a branch pipe nozzle of a special-shaped part with the branch pipe nozzle is machined, a machining coordinate system cannot be built once, machining needs to be conducted twice, and the precision and quality of a finished product are low, the milling machine machining coordinate system building method for the special-shaped part with the branch pipe nozzle comprises the steps that S10, the bottom plane and the outer circle face of a blank are machined, finish machining of the square boss and the end face of the branch pipe nozzle blank; s20, a universal milling head is adopted for installing a centering rod, and an initial coordinate system is determined in cooperation with the sphere center of the blank and the end face of the square boss; s30, the initial coordinate system is rotated until the Z axis of the initial coordinate system coincides with the center line of the branch pipe nozzle blank, and a second coordinate system is formed; and S40, resetting the Z-axis 0 position of the second coordinate system to obtain a final machining coordinate system. The universal milling head and the centering rod are combined, the machining coordinate system for the branch pipe nozzle is accurately established, it is guaranteed that the branch pipe nozzle is machined and formed at a time, and the precision and quality of a finished product are improved.

Description

Technical Field

[0001] The present application relates to the field of forging technology, and in particular to a method for establishing a machining coordinate system for a milling machine of a special-shaped part with a branch nozzle. Background Art

[0002] With the rapid development of the national equipment manufacturing industry, the demand for special-shaped forgings continues to rise, and is gradually developing towards special-shaped and large-scale.

[0003] like Figure 1 The special-shaped part with branch nozzles is a key part in a nuclear power evaporator. It is hemispherical as a whole, has two branch nozzles and two circular inclined platforms on the outer contour, and four square bosses are evenly distributed at 90 degrees around the periphery.

[0004] Normally, when a CNC milling machine is used for processing, the milling process is carried out in layers from the top of the part. The processing area can cover most of the outer contour of the part, and the remaining area is processed from the side using a right-angle milling head. This processing method divides the circular contour of the branch nozzle into at least two areas for processing. The two processing bases are different. Due to the difference in the accuracy of the base transfer during processing, there will be a certain degree of tool connection step between the two processing, which affects the dimensional accuracy and processing quality of the branch nozzle, and further affects the accuracy and quality of the part. Summary of the invention

[0005] The purpose of this application is to solve the problem in the prior art that when processing a branch nozzle of a special-shaped part with a branch nozzle, a processing coordinate system cannot be established once, and two processings are required, resulting in low precision and quality of the finished product. Therefore, this application provides a method for establishing a milling machine processing coordinate system for special-shaped parts with branch nozzles. Through fine processing on a milling machine, combined with a universal milling head and a centering rod, a processing coordinate system for the branch nozzle is accurately established, and processing along the axial direction of the branch nozzle is achieved, ensuring that the branch nozzle is processed and formed once, thereby improving the precision and quality of the finished product.

[0006] The embodiment of the present application provides a method for establishing a coordinate system for a milling machine processing a special-shaped part with a branch nozzle, wherein the part is hemispherical, and has two branch nozzles and two circular ramps on the outer contour, and four square bosses are evenly distributed at 90° around the periphery, and the square boss has an upper end face, two mutually parallel side end faces and a front end face, the upper end face is parallel to the bottom plane of the part, and the two side end faces and the front end face are perpendicular to the bottom plane of the part, and the method comprises:

[0007] S10, obtaining a blank, wherein the blank is formed with a bottom plane, an outer cylindrical surface, four square bosses and a branch nozzle blank, and fine-machining the bottom plane and the outer cylindrical surface of the blank by a vertical lathe, and fine-machining the upper end surface, both side end surfaces and the front end surface of the square boss, and the end surface of the branch nozzle blank by a milling machine;

[0008] S20, using a universal milling head to install a centering rod, and determining an initial coordinate system in conjunction with the spherical center of the blank and the end surface of the square boss;

[0009] S30, rotating the blank to an angle corresponding to the nozzle blank through a milling machine turntable, and rotating the initial coordinate system until its Z axis coincides with the center line of the nozzle blank to form a second coordinate system;

[0010] S40, placing the end face of the centering rod against the end face of the branch nozzle blank to obtain the Z value of the end face of the branch nozzle blank in the second coordinate system; replacing the universal milling head with a machining tool, placing the end face of the machining tool against the end face of the bevel nozzle, and resetting the Z axis 0 position of the second coordinate system according to the Z value to obtain the final machining coordinate system.

[0011] In some embodiments, in S10, a milling machine is used to finely process the upper end surface, the two side end surfaces and the front end surface of the square boss, and the end surface of the branch nozzle blank, including:

[0012] S11, transferring the blank after fine processing by the vertical lathe to a milling machine, and making the center axis of the blank coincide with the rotation center axis of the milling machine table;

[0013] S12, rotating the blank to any position facing the square boss, and setting the B axis to 0 position;

[0014] S13, milling the upper end surface, both side end surfaces and the front end surface of the square boss flat by a minimum amount;

[0015] S14, installing a universal milling head, and adjusting the universal milling head to have the same angle as the branch nozzle blank, rotating the blank to a corresponding angle of the branch nozzle blank through a turntable, and using the universal milling head to install a machining tool to mill the end face of the branch nozzle blank with a minimum amount.

[0016] In some embodiments, S20 uses a universal milling head to install a centering rod, and determines an initial coordinate system in conjunction with the spherical center of the blank and the end surface of the square boss, including:

[0017] S21, rotating the blank to the B-axis 0 position, installing a centering rod on the universal milling head, and placing the centering rod against two side end surfaces of the square boss, and taking the center of two positions of the centering rod as the X-axis 0 position;

[0018] S22, the side of the centering rod is pressed against the upper end surface of the square boss, and the angle between the side of the centering rod and the upper end surface is equal to the angle between the branch nozzle of the part and the center axis of the part, and the distance Z moved downward by the centering rod is the Z axis 0 position, Z = H0 + D / 2 × SIN (α);

[0019] S23, the centering rod is kept at an unchanged angle, its side is pressed against the front end surface of the square boss, and the centering rod is moved toward the center axis of the blank by a distance Y, which is the Y axis 0 position, Y=L0+D / 2×COS(α);

[0020] S24, establishing the initial coordinate system according to the X-axis 0 position, the Y-axis 0 position, and the Z-axis 0 position;

[0021] Wherein, D is the diameter of the centering rod, H0 is the distance between the upper end face of the square boss and the center of the blank, α is the angle between the branch nozzle of the part and the center axis of the part, and L0 is the distance between the front end face of the square boss and the center of the blank.

[0022] In some embodiments, S12 performs fine adjustment by rotation and uses a drag gauge to detect the straightness of the front end surface of the square boss to determine that the blank is rotated to a position facing the square boss, and uses a drag gauge to detect at least the square bosses on the left and right sides of the square boss to verify the B-axis 0 position.

[0023] In some embodiments, in S14, a dial indicator is used to fix the milling head and to detect the straightness and bevel of the front end surface of the square boss, and the angle of the universal milling head is verified to ensure that it is the same as the angle of the branch nozzle blank.

[0024] Beneficial effects:

[0025] The present application uses a milling machine to fine-process the branch pipe nozzle, and combines a universal milling head and a centering rod to accurately establish a processing coordinate system for the branch pipe nozzle, so as to realize axial processing along the branch pipe nozzle, ensure that the branch pipe nozzle is processed and formed in one time, avoid the generation of a tool connecting step on the branch pipe nozzle, and improve the precision and quality of the finished product.

[0026] Other features and corresponding beneficial effects of the present application are described in the latter part of the specification, and it should be understood that at least some of the beneficial effects become obvious from the records in the specification of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 A schematic structural diagram of a special-shaped part with a branch nozzle provided in an embodiment of the present application;

[0028] Figure 2 This is a schematic diagram of the processing state of the parts in the embodiment of the present application;

[0029] FIG3(a)-(b) are schematic diagrams of an initial coordinate system established in an embodiment of the present application, which coincides with the design reference, and FIG3(a) is an XZ axis view, and FIG3(b) is an XY axis view;

[0030] Figure 4In the embodiment of the present application, the centering rod is attached to the side end surface of the square boss to set the X-axis 0 position;

[0031] Figure 5 The centering rod in the embodiment of the present application is pressed against the upper end surface of the square boss to set the Z-axis 0 position;

[0032] Figure 6 In the embodiment of the present application, the centering rod is attached to the front end surface of the square boss to set the Y-axis 0 position;

[0033] Figure 7 This is a schematic diagram of the conversion of the X and Y axes in the embodiment of the present application;

[0034] 8(a)-(b) are schematic diagrams of a second coordinate system established in an embodiment of the present application, wherein FIG. 8(a) is an XZ axis view, and FIG. 8(b) is an XY axis view;

[0035] Fig. 9 In the embodiment of the present application, the machining tool is close to the end face of the nozzle blank to set the Z-axis 0 position.

[0036] Description of reference numerals:

[0037] 1. Special-shaped parts with branch nozzles; 2. Branch nozzles; 3. Square bosses; 31. Side end faces; 32. Upper end faces; 33. Front end faces;

[0038] 4. Universal milling head; 5. Processing tool; 6. Centering rod. DETAILED DESCRIPTION

[0039] The following specific embodiments illustrate the implementation of the present application, and those skilled in the art can easily understand other advantages and effects of the present application from the contents disclosed in this specification. Although the description of the present application will be introduced in conjunction with the preferred embodiment, this does not mean that the features of this application are limited to the implementation. On the contrary, the purpose of introducing the application in conjunction with the implementation is to cover other options or modifications that may be extended based on the claims of the present application. In order to provide a deep understanding of the present application, the following description will include many specific details. The present application can also be implemented without using these details. In addition, in order to avoid confusion or blurring the focus of the present application, some specific details will be omitted in the description. It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0040] It should be noted that in this specification, similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

[0041] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, which are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", and "third" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description created by the present application, unless otherwise specified, "multiple" means two or more. Unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For those skilled in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0042] like Figure 1-2 As shown, a special-shaped part 1 with a branch nozzle is a key part in a nuclear power evaporator. It is hemispherical as a whole, and has two branch nozzles 2 and two circular inclined platforms on the outer contour. Four square bosses 3 are evenly distributed at 90° around the periphery, and the square bosses 3 have an upper end face 43, two mutually parallel side end faces 31 and a front end face 33. The upper end face 32 is parallel to the bottom plane of the part, and the two side end faces 31 and the front end face 33 are perpendicular to the bottom plane of the part.

[0043] Usually, the finishing of the nozzle 2 of the part 1 needs to be divided into at least two areas for processing, and the bases of the two processings are different ( Figure 2 (a) is a schematic diagram of one of the processing states. Due to the difference in the accuracy of the reference transfer during processing, there will be a certain degree of tool connection step between the two processings, which will affect the dimensional accuracy and processing quality of the branch nozzle, and further affect the accuracy and quality of the parts.

[0044] The embodiment of the present application provides a method for establishing a machining coordinate system of a special-shaped part with a branch nozzle by a milling machine. The branch nozzle is finely processed by a milling machine, and a machining coordinate system for the branch nozzle is accurately established in combination with a universal milling head 4 and a centering rod 6. That is, the machining coordinate system is converted into a rotating coordinate system with the same angle as the branch nozzle. The branch nozzle can be processed along the axial direction to ensure that the branch nozzle is processed and formed in one time, avoid the generation of a tool connecting step on the branch nozzle, and improve the precision and quality of the finished product.

[0045] It should be noted that the centering rod, also known as an edge finder or center rod, is an important auxiliary tool in machine tool operation, mainly used for positioning machine tool workpieces.

[0046] The universal milling head, also known as the universal milling head or the universal angle head, is a machine tool accessory. After the milling head is installed on the machine tool, the tool rotation centerline can form an angle with the spindle rotation centerline to process the workpiece.

[0047] Please refer to Figure 3-9. The methods include:

[0048] S10, obtaining a blank, wherein the blank is formed with a bottom plane, an outer cylindrical surface, four square bosses 3 and a branch nozzle blank. The blank can be prepared by conventional techniques in the art, which belongs to a rough machining process.

[0049] After the previous blank is transferred to the finishing process, the vertical lathe is first used to finish the bottom plane and outer cylindrical surface of the blank as a reference for milling machine processing to ensure that the processing content of the vertical lathe is consistent with the processing content of the milling machine. This step can also record the measured size of the large outer circle and the measured size of the bottom plane from the center of the ball (design basis) as a reference for the subsequent milling machine benchmark establishment.

[0050] Then, the upper end face 32, the two side end faces 31 and the front end face 33 of the square boss 3, as well as the end face of the branch nozzle blank are finely processed by a milling machine, which may specifically include:

[0051] S11. The blank after fine processing on the vertical lathe is transferred to the milling machine, and the center axis of the blank is made to coincide with the rotation center axis of the milling machine table. That is, the blank is placed at the center of the turntable of the milling machine, and a circle is circled to confirm that the center axis of the blank coincides with the rotation center axis of the milling machine table.

[0052] S12, rotate the blank to any position facing the square boss 3, and set the B axis to 0 position.

[0053] Preferably, fine adjustment is performed by slight rotation and the front end face 33 of the square boss 3 is checked by a drag gauge to determine the straightness of the blank so as to determine the orientation of the blank facing the square boss 3, and the square boss 3 on at least the left and right sides of the square boss 3 is checked by a drag gauge to verify the 0 position of the B-axis (rotation axis).

[0054] Because the four square bosses 3 are evenly distributed, it can be verified by other square bosses 3, and can be further rotated 90°, 180°, and 270° respectively, and the remaining three square bosses 3 can be verified to be straight by dragging the table.

[0055] S13, milling the upper end surface 32, the two side end surfaces 31 and the front end surface 33 of the square boss 3 to a minimum extent.

[0056] In this step, each end face of the square boss 3 is finely processed as a measurement reference to ensure the accuracy of the subsequent coordinate system establishment.

[0057] Specifically, see Figure 7 , mill the upper end faces 32 of the square boss 3 at four edges at the minimum, and mill the size reference on both sides, use a meter to check the actual value of the distance between the upper end face 32 of the square boss 3 and the bottom plane, and add up the distance from the bottom plane to the center of the sphere, which is recorded as H0.

[0058] Install the right-angle milling head, mill the front end faces 33 of the square boss 3 at four places at the minimum, and measure the distance from the front end face 33 of the square boss 3 to the center of the sphere based on the measured size of the outer cylindrical surface, which is recorded as L0.

[0059] It is understandable that when processing the upper end faces 32 of the four square bosses 3, the dimensions should be consistent, so as to facilitate the reference for setting the Z-axis 0 point later. When processing the side end faces 31 of the square boss 3, the two sides should be symmetrical, so as to center and set the X-axis 0 point when the universal milling head 4 is installed.

[0060] S14, add the universal milling head 4, and adjust the universal milling head 4 to have the same angle as the nozzle blank. Preferably, the universal milling head 4 is fixed by a dial indicator, and the milling head is pressed to detect the straightness and bevel of the front end surface 33 of the square boss 3, and the angle of the universal milling head 4 is verified to ensure that it is the same as the nozzle blank. That is, the universal milling head 4 is moved in the vertical angle direction, and the accuracy of the milling head angle is verified by the change of the dial indicator reading.

[0061] The blank is rotated to the corresponding angle of the branch nozzle blank through the turntable, and the end face of the branch nozzle blank is milled flat by the minimum amount through the universal milling head 4 equipped with a processing tool 5, which is used as a reference for subsequent transfer.

[0062] S20, using the universal milling head 4 to install the centering rod 6, and determining the initial coordinate system in coordination with the spherical center of the blank and the end surface of the square boss 3, which may specifically include:

[0063] S21, turn the blank to the B-axis 0 position, install the centering rod 6 on the universal milling head 4, and place the centering rod 6 against the two side end surfaces 31 of the square boss 3, and take the center of the two positions of the centering rod 6 as the X-axis 0 position, see Figure 4 .

[0064] S22, place the side of the centering rod 6 against the upper end surface 32 of the square boss 3, and the angle between it and the upper end surface 32 is equal to the angle between the branch nozzle of the part and the center axis of the part, and move the centering rod 6 downward by a distance Z to the Z axis 0 position, Z = H0 + D / 2 × SIN (α), see Figure 5 .

[0065] S23, keep the centering rod 6 at the same angle, and place its side against the front end surface 33 of the square boss 3, and move the centering rod 6 to the center axis of the blank at a distance Y, which is the Y axis 0 position, Y = L0 + D / 2 × COS (α), see Figure 6 .

[0066] S24, establish an initial coordinate system according to the X-axis 0 position, the Y-axis 0 position and the Z-axis 0 position, see Figure 3 (a)-(b). So far, the initial processing reference and 0 position setting of the part in the state of installing the universal milling head 4 are completed.

[0067] Among them, D is the diameter of the centering rod 6, H0 is the distance between the upper end face 32 of the square boss 3 and the center of the blank, α is the angle between the branch nozzle of the part and the central axis of the part, that is, the angle between the center line of the branch nozzle blank and the central axis of the blank, and L0 is the distance between the front end face 33 of the square boss 3 and the center of the blank.

[0068] It should be noted that the X-axis 0 position, Y-axis 0 position and Z-axis 0 position obtained above refer to the planes whose X, Y and Z axis coordinates are 0, and the initial coordinate system is obtained by intersecting the three planes.

[0069] S30, the blank is rotated to the angle corresponding to the nozzle blank through the milling machine turntable. Since the machining reference is set at the center of the blank, and the center axis of the blank coincides with the center axis of the turntable, the reference origin does not shift when the blank is rotated.

[0070] The initial coordinate system is rotated until its Z axis coincides with the center line of the branch nozzle blank to form a second coordinate system. The rotation of the coordinate system can be completed by the machine tool program. The command for the machine tool to rotate the coordinate system is ROT X = -α, see Figure 8 (a)-(b). At this point, the machining datum along the axial direction of the branch nozzle is completed.

[0071] However, this coordinate system is established in the state of clamping the centering rod 6. After replacing the processing tool 5, because the length of the processing tool 5 is not exactly the same as the length of the centering rod 6, the 0 position of the processing feed axis (Z axis in this embodiment) needs to be reset. At this time, the end face of the branch nozzle is used as the conversion reference of the front and rear Z axis 0 positions, which can complete the reference conversion more conveniently and accurately. At the same time, because when replacing the centering rod 6 or the processing tool 5, the central axis coincides with the axis of the universal milling head 4, the 0 points of the remaining two axes do not need to be converted.

[0072] Therefore, this embodiment also includes:

[0073] S40, placing the end face of the centering rod 6 against the end face of the branch nozzle blank to obtain the Z value of the end face of the branch nozzle blank in the second coordinate system.

[0074] See also Fig. 9 , replace the universal milling head 4 with the processing tool 5, and the end face of the processing tool 5 is placed against the end face of the bevel nozzle. According to the Z value, the Z-axis 0 position of the second coordinate system is reset through the machine tool program to obtain the final processing coordinate system. At this point, the coordinate system and 0 position setting of the processing branch nozzle of the universal milling head 4 in the tool clamping state are completed.

[0075] It should be noted that the machine tool program controls the processing tools, such as the universal milling head 4, the processing tool 5, etc., to perform fine processing on the parts through the set coordinate system. The original coordinate system of the machine tool can be used during processing, or a new coordinate system can be set through coordinate conversion in the machine tool program.

[0076] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A method for establishing a coordinate system for a milling machine processing a special-shaped part with a nozzle, wherein the part is hemispherical, and has two nozzles and two circular ramps on the outer contour, and four square bosses are evenly distributed at 90° around the periphery, and the square boss has an upper end face, two mutually parallel side end faces and a front end face, the upper end face is parallel to the bottom plane of the part, and the two side end faces and the front end face are perpendicular to the bottom plane of the part, characterized in that: The method comprises: S10, obtaining a blank, wherein the blank is formed with a bottom plane, an outer cylindrical surface, four square bosses and a branch nozzle blank, and fine-machining the bottom plane and the outer cylindrical surface of the blank by a vertical lathe, and fine-machining the upper end surface, both side end surfaces and the front end surface of the square boss, and the end surface of the branch nozzle blank by a milling machine; S20, using a universal milling head to install a centering rod, and determining an initial coordinate system in conjunction with the spherical center of the blank and the end surface of the square boss; S30, rotating the blank to an angle corresponding to the nozzle blank through a milling machine turntable, and rotating the initial coordinate system until its Z axis coincides with the center line of the nozzle blank to form a second coordinate system; S40, placing the end face of the centering rod against the end face of the branch nozzle blank to obtain the Z value of the end face of the branch nozzle blank in the second coordinate system; replacing the universal milling head with a machining tool, placing the end face of the machining tool against the end face of the bevel nozzle, and resetting the Z axis 0 position of the second coordinate system according to the Z value to obtain the final machining coordinate system.

2. The method for establishing a coordinate system for milling machine processing of special-shaped parts with branch nozzles according to claim 1, characterized in that: In S10, a milling machine is used to finely process the upper end face, the two side end faces and the front end face of the square boss, as well as the end face of the branch nozzle blank, including: S11, transferring the blank after fine processing by the vertical lathe to a milling machine, and making the center axis of the blank coincide with the rotation center axis of the milling machine table; S12, rotating the blank to any position facing the square boss, and setting the B axis to 0 position; S13, milling the upper end surface, both side end surfaces and the front end surface of the square boss flat by a minimum amount; S14, installing a universal milling head, and adjusting the universal milling head to have the same angle as the branch nozzle blank, rotating the blank to a corresponding angle of the branch nozzle blank through a turntable, and using the universal milling head to install a machining tool to mill the end face of the branch nozzle blank with a minimum amount.

3. The method for establishing a coordinate system for milling machine processing of special-shaped parts with branch nozzles according to claim 2, characterized in that: S20 uses a universal milling head to install a centering rod, and determines the initial coordinate system in conjunction with the spherical center of the blank and the end face of the square boss, including: S21, rotating the blank to the B-axis 0 position, installing a centering rod on the universal milling head, and placing the centering rod against two side end surfaces of the square boss, and taking the center of two positions of the centering rod as the X-axis 0 position; S22, the side of the centering rod is pressed against the upper end surface of the square boss, and the angle between the side of the centering rod and the upper end surface is equal to the angle between the branch nozzle of the part and the center axis of the part, and the distance Z moved downward by the centering rod is the Z axis 0 position, Z = H0 + D / 2 × SIN (α); S23, the centering rod is kept at an unchanged angle, its side is pressed against the front end surface of the square boss, and the centering rod is moved toward the center axis of the blank by a distance Y, which is the Y axis 0 position, Y=L0+D / 2×COS(α); S24, establishing the initial coordinate system according to the X-axis 0 position, the Y-axis 0 position, and the Z-axis 0 position; Wherein, D is the diameter of the centering rod, H0 is the distance between the upper end face of the square boss and the center of the blank, α is the angle between the branch nozzle of the part and the center axis of the part, and L0 is the distance between the front end face of the square boss and the center of the blank.

4. The method for establishing a coordinate system for milling machine processing of special-shaped parts with branch nozzles according to claim 2, characterized in that: S12 performs fine adjustment by rotation and uses a drag gauge to detect the straightness of the front end surface of the square boss to determine that the blank is rotated to the position facing the square boss, and uses a drag gauge to detect at least the square boss on the left and right sides of the square boss to verify the B-axis 0 position.

5. The method for establishing a coordinate system for milling machine processing of special-shaped parts with branch nozzles according to claim 2, characterized in that: In S14, the milling head is fixed by a dial indicator, and the front end surface straightness and bevel angle of the square boss are detected, and the angle of the universal milling head is verified to ensure that it is the same as the angle of the branch nozzle blank.

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