A method for establishing a milling machine processing coordinate system of a special-shaped part with a branch nozzle

Abstract

The application provides a milling machine processing coordinate system establishment method for special-shaped parts with branch nozzles, and belongs to the field of forging technology. In view of the problem that the primary processing coordinate system cannot be established when the branch nozzle of the special-shaped part with the branch nozzle is processed, twice processing is required, and the finished product precision and quality are low, the application provides a milling machine processing coordinate system establishment method for special-shaped parts with branch nozzles, which comprises the following steps: S10, finish machining of the bottom plane and the outer circular surface of the blank, the square boss and the branch nozzle blank end face; S20, adopt a universal milling head to install a centering rod, cooperate with the spherical center of the blank and the square boss end face to determine an initial coordinate system; S30, rotate the initial coordinate system to make the Z-axis coincide with the center line of the branch nozzle blank, and form a second coordinate system; and S40, reset the Z-axis 0 position of the second coordinate system to obtain a final processing coordinate system. The application combines the universal milling head and the centering rod to accurately establish the processing coordinate system for the branch nozzle, ensures one-time processing of the branch nozzle, and improves the finished product precision and quality.

Description

Technical Field

[0001] This application relates to the field of forging technology, and in particular to a method for establishing a coordinate system for milling irregular parts with branch nozzles. Background Technology

[0002] With the rapid development of the national equipment manufacturing industry, the demand for various types of irregular forgings is constantly increasing, and is gradually developing towards irregular shapes and large sizes.

[0003] like Figure 1 The aforementioned irregularly shaped part with branch nozzles is a key component in nuclear power plant evaporators. It is hemispherical in shape, with two branch nozzles and two circular ramps on its outer contour, and four square protrusions evenly distributed around its 90° perimeter.

[0004] Typically, when machining with a CNC milling machine, milling is performed layer by layer starting from the top of the part. The machining area covers most of the part's outer contour, and the remaining area is profiled from the side using a right-angle milling head. This machining method divides the circular contour of the branch nozzle into at least two areas for machining. The reference points for the two machining operations are different. Due to the difference in the accuracy of the reference transfer, there will be a certain degree of tool transition step between the two machining operations, which affects the dimensional accuracy and machining quality of the branch nozzle, and consequently 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 machining irregularly shaped parts with branch nozzles, it is impossible to establish a machining coordinate system in one operation, requiring two machining operations, resulting in lower accuracy and quality of the finished product. Therefore, this application provides a method for establishing a milling machine machining coordinate system for irregularly shaped parts with branch nozzles. Through milling machine finishing, combined with a universal milling head and a centering bar, a machining coordinate system for the branch nozzle is accurately established, enabling machining along the axial direction of the branch nozzle, ensuring that the branch nozzle is formed in one operation, and improving the accuracy and quality of the finished product.

[0006] This application provides a method for establishing a milling coordinate system for an irregularly shaped part with a branch nozzle. The part is hemispherical and has two branch nozzles and two circular ramps on its outer contour. Four square bosses are evenly distributed around its perimeter at 90° angles. Each square boss has a top surface, two parallel side surfaces, and a front surface. The top surface is parallel to the bottom plane of the part, and the two side surfaces and the front surface are perpendicular to the bottom plane of the part. The method includes:

[0007] S10. Obtain a blank, the blank having a bottom plane, an outer circular surface, four square bosses and a branch nozzle blank. Use a vertical lathe to finish the bottom plane and outer circular surface of the blank, and use a milling machine to finish the upper end face, two side end faces and front end face of the square bosses, as well as the end face of the branch nozzle blank.

[0008] S20. Use a universal milling head to install the center bar, and determine the initial coordinate system in conjunction with the center of the blank and the end face of the square boss;

[0009] S30. The blank is rotated to an angle corresponding to the branch nozzle blank by the milling machine turntable, and the initial coordinate system is rotated so that its Z-axis coincides with the center line of the branch nozzle blank to form a second coordinate system;

[0010] S40. Place the end face of the centering bar 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; replace the universal milling head with a machining tool, place the end face of the machining tool against the end face of the oblique nozzle, and reset 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 finish the upper end face, two side end faces, and front end face of the square boss, as well as the end face of the branch pipe blank, including:

[0012] S11. The blank, after being precision machined on a vertical lathe, is transferred to a milling machine, and the central axis of the blank is made to coincide with the rotation center axis of the milling machine table.

[0013] S12. Rotate the blank to any position directly opposite the square boss, and set the B-axis to position 0.

[0014] S13. Mill the top surface, two side surfaces and front surface of the square boss with minimum amount of milling;

[0015] S14. Install a universal milling head and adjust the angle of the universal milling head to be the same as that of the branch pipe blank. Rotate the blank to the corresponding angle of the branch pipe blank through the turntable, and mill the end face of the branch pipe blank with the minimum amount of machining tool by using the universal milling head.

[0016] In some embodiments, S20 uses a universal milling head to assemble a center bar, which, in conjunction with the center of the blank and the end face of the square boss, determines the initial coordinate system, including:

[0017] S21. Rotate the blank to position 0 on the B axis, install the centering bar on the universal milling head, and place the centering bar against the two side end faces of the square boss. Take the middle position of the two positions of the centering bar as position 0 on the X axis.

[0018] S22. The side of the centering rod is placed against the upper end face of the square boss, and the angle between the centering rod and the upper end face is equal to the angle between the branch nozzle of the part and the central axis of the part. The centering rod is moved down a distance Z to the Z-axis position 0, Z = H0 + D / 2 × SIN(α).

[0019] S23. The centering rod keeps its angle unchanged, its side is attached to the front end face of the square boss, and the centering rod moves a distance Y towards the center axis of the blank to the Y-axis 0 position, Y=L0+D / 2×COS(α);

[0020] S24. Establish the initial coordinate system based on the X-axis 0 position, Y-axis 0 position, and 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 ball, α is the angle between the branch nozzle of the part and the central axis of the part, and L0 is the distance between the front end face of the square boss and the center of the blank ball.

[0022] In some embodiments, S12 performs fine-tuning by rotation, uses a dial indicator to detect the straightness of the front end face of the square boss, determines the position of the blank facing the square boss, and uses a dial indicator to detect at least 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 for fixing, and a milling head pressure gauge is used to detect the straightness and bevel of the front end face of the square boss, verifying the angle of the universal milling head and ensuring that it is the same as the angle of the branch pipe blank.

[0024] Beneficial effects:

[0025] This application uses a milling machine to precision machine the branch nozzle, and combines a universal milling head and a centering bar to accurately establish a machining coordinate system for the branch nozzle, enabling machining along the axial direction of the branch nozzle, ensuring that the branch nozzle is machined in one go, avoiding tool-jointing steps on the branch nozzle, and improving the accuracy and quality of the finished product.

[0026] Other features and corresponding beneficial effects of this application will be described in the latter part of the specification, and it should be understood that at least some of the beneficial effects will become obvious from the description in this application. Attached Figure Description

[0027] Figure 1 This is a structural schematic diagram of an irregularly shaped part with a branch nozzle provided in an embodiment of this application;

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

[0029] Figures 3(a)-(b) are schematic diagrams of the initial coordinate system established in the embodiments of this application, which coincide with the design datum. Figure 3(a) is the XZ axis view and Figure 3(b) is the XY axis view.

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

[0031] Figure 5 In this embodiment of the application, the dividing rod is attached to the upper surface of the square protrusion to set the Z-axis position to 0.

[0032] Figure 6 In this embodiment of the application, the dividing rod is attached to the front end face of the square boss to set the Y-axis position to 0.

[0033] Figure 7 This is a schematic diagram of the X and Y axis 0-position conversion in the embodiments of this application;

[0034] Figures 8(a)-(b) are schematic diagrams of the second coordinate system established in the embodiments of this application, wherein Figure 8(a) is the XZ axis view and Figure 8(b) is the XY axis view;

[0035] Figure 9 In this embodiment of the application, the machining tool is attached to the end face of the branch pipe blank to set the Z-axis position to 0.

[0036] Explanation of reference numerals in the attached figures:

[0037] 1. Irregularly shaped part with a branch nozzle; 2. Branch nozzle; 3. Square boss; 31. Side end face; 32. Top end face; 33. Front end face;

[0038] 4. Universal milling head; 5. Machining tool; 6. Centering bar. Detailed Implementation

[0039] The following specific embodiments illustrate the implementation of this application. Those skilled in the art can easily understand other advantages and effects of this application from the content disclosed in this specification. Although the description of this application is presented in conjunction with preferred embodiments, this does not mean that the features of this application are limited to this embodiment. On the contrary, the purpose of describing the application in conjunction with embodiments is to cover other options or modifications that may be derived based on the claims of this application. To provide a thorough understanding of this application, many specific details will be included in the following description. This application may also be implemented without using these details. Furthermore, to avoid confusion or obscuring the focus of this application, some specific details will be omitted in the description. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of this application can be combined with each other.

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

[0041] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used solely for the convenience of describing this application and for simplification, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more. Unless otherwise explicitly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; a mechanical connection or an electrical connection; a direct connection or an indirect connection through an intermediate medium; or a connection within two elements. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0042] like Figure 1-2 As shown, a non-circular part 1 with branch nozzles is a key component in a nuclear power evaporator. It is hemispherical in shape and has two branch nozzles 2 and two circular ramps on its outer contour. Four square bosses 3 are evenly distributed around its perimeter at 90°. Each square boss 3 has an upper end face 43, two 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] Typically, the finishing of the branch nozzle 2 of part 1 requires processing in at least two areas, with different datum points for the two processing steps. Figure 2 (This is a schematic diagram of one of the processing states). During processing, due to the difference in accuracy of the reference transfer, there will be a certain degree of tool step between the two processing steps, which will affect the dimensional accuracy and processing quality of the branch nozzle, and thus affect the accuracy and quality of the parts.

[0044] This application provides a method for establishing a milling coordinate system for irregularly shaped parts with branch nozzles. By precision milling the branch nozzle with a milling machine and combining it with a universal milling head 4 and a centering bar 6, a precise machining coordinate system for the branch nozzle is established. That is, the machining coordinate system is transformed into a rotational coordinate system with the same angle as the branch nozzle, which can be machined along the axial direction of the branch nozzle, ensuring that the branch nozzle is machined in one go, avoiding the formation of tool-jointing steps on the branch nozzle, and improving the accuracy and quality of the finished product.

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

[0046] A universal milling head, also known as a universal milling head or universal angle head, is a machine tool accessory that allows the tool's rotation center line to be angled to the spindle's rotation center line when machining workpieces.

[0047] Please refer to Figure 3-9. The method includes:

[0048] S10. Obtain the blank. The blank has a bottom plane, an outer circular surface, four square bosses 3, and a branch nozzle blank. The blank preparation can be carried out using conventional techniques in this field and belongs to the roughing process.

[0049] After the blank is transferred to the finishing process, the bottom plane and outer cylindrical surface of the blank are first finished using a vertical lathe. This serves as a reference datum for the milling machine machining, ensuring that the machining content of the vertical lathe is consistent with the machining content datum of the turning and milling machine. This step can also record the actual measured dimensions of the large outer diameter and the actual measured dimensions of the bottom plane from the center of the sphere (design datum), which will serve as a reference for establishing the datum of the subsequent turning and milling machine.

[0050] Then, a milling machine is used to finish 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 pipe blank. Specifically, this includes:

[0051] S11. After the blank is finished on the vertical lathe, it is transferred to the milling machine, and the central axis of the blank is made to coincide with the rotation center axis of the milling machine table. That is, the blank is placed in the center of the turntable of the lathe and milling machine, and the circle is checked to ensure that the central axis of the blank coincides with the rotation center axis of the turntable of the lathe and milling machine.

[0052] S12. Rotate the blank to any position directly opposite the square boss 3, and set the B axis to position 0.

[0053] Preferably, fine-tuning is performed by micro-rotation, and the front end face 33 of the square boss 3 is checked by dragging the dial indicator to determine the position of the blank directly facing the square boss 3. The dial indicator is also used to check the position of the square boss 3 on at least the left and right sides of the square boss 3 to verify the B-axis (rotation axis) 0 position.

[0054] Since the four square protrusions 3 are evenly distributed, they can be verified by the other square protrusions 3. Furthermore, they can be rotated by 90°, 180°, and 270° respectively, and the dial gauge can be dragged to verify that the remaining three square protrusions 3 are straight.

[0055] S13. Mill the top surface 32, the two side surfaces 31, and the front surface 33 of the square boss 3 with minimum quantity.

[0056] This step involves precision machining of each end face of the square boss 3, which serves as a measurement reference to ensure the accuracy of the subsequent coordinate system establishment.

[0057] Specifically, see Figure 7 The minimum amount of milling is used to flatten the upper surface 32 of the four square bosses 3 around the perimeter, and the two sides are milled according to the dimensional reference. The actual value of the distance from the upper surface 32 of the square bosses 3 to the bottom plane is measured by dial indicator. The distance from the bottom plane to the center of the sphere is accumulated and recorded as H0.

[0058] Install a right-angle milling head and mill the front face 33 of the four square bosses 3 with the minimum amount of milling. Using the actual measured size of the outer circle as a reference, measure the actual distance from the front face 33 of the machined square bosses 3 to the center of the sphere, and record it as L0.

[0059] Understandably, when machining the upper end face 32 of the four square bosses 3, the dimensions should be consistent to facilitate reference when setting the Z-axis 0 point later. When machining the side end face 31 of the square bosses 3 as a reference, the two sides should be symmetrical to be used for centering and fixing the X-axis 0 point in the state of mounting the universal milling head 4.

[0060] S14. Install the universal milling head 4 and adjust the angle of the universal milling head 4 to be the same as that of the branch pipe blank. Preferably, the universal milling head 4 is fixed by a dial indicator, and the milling head is pressed against the dial indicator to check the straightness and bevel of the front end face 33 of the square boss 3. The angle of the universal milling head 4 is verified to ensure that it is the same as the angle of the branch pipe blank. That is, the reference plane or tool plane on the universal milling head 4 is pressed against the dial indicator and other testing tools. Then the universal milling head 4 is moved in the vertical angle direction. 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 using a turntable, and the end face of the branch nozzle blank is milled flat by the minimum amount using the universal milling head 4 and the machining tool 5, which is used as the reference for subsequent transfer.

[0062] S20. Using a universal milling head 4 with a centering bar 6, the initial coordinate system is determined in conjunction with the spherical center of the blank and the end face of the square boss 3. Specifically, this may include:

[0063] S21. Rotate the blank to position 0 on the B-axis. Mount the centering rod 6 on the universal milling head 4 and place the centering rod 6 against the two side end faces 31 of the square boss 3. Take the midpoint between the two positions of the centering rod 6 as the position 0 on the X-axis. See below. Figure 4 .

[0064] S22. Place the side of the centering rod 6 against the upper end face 32 of the square boss 3, with the angle between the centering rod 6 and the upper end face 32 being equal to the angle between the branch nozzle of the part and the central axis of the part. Move the centering rod 6 downwards a distance Z to the Z-axis position 0, Z = H0 + D / 2 × SIN(α). See [reference needed]. Figure 5 .

[0065] S23. The centering rod 6, keeping its angle unchanged, is placed against the front face 33 of the square boss 3. The centering rod 6 is then moved a distance Y towards the center axis of the blank, which is the Y-axis position 0. Y = L0 + D / 2 × COS(α). See [reference needed]. Figure 6 .

[0066] S24. Establish the initial coordinate system based on the X-axis 0 position, Y-axis 0 position, and Z-axis 0 position, as shown in Figures 3(a)-(b). At this point, the initial machining datum and 0 position settings for the part in state 4 with the universal milling head installed are complete.

[0067] Where 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 ball, 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 ball.

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

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

[0070] Rotate the initial coordinate system 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 machine tool command for rotating the coordinate system is ROT X = -α, see Figures 8(a)-(b). At this point, the machining datum for machining along the branch nozzle axis is completed.

[0071] However, this coordinate system is established with the centering bar 6 clamped. After replacing it with the machining tool 5, because the length of the machining tool 5 is not exactly the same as the length of the centering bar 6, the 0 position of the machining 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 for the front and rear Z-axis 0 positions, which can complete the reference conversion conveniently and accurately. At the same time, since the axis of the centering bar 6 or the machining tool 5 coincides with the axis of the universal milling head 4 when they are replaced, the 0 points of the remaining two axes do not need to be converted.

[0072] Therefore, this embodiment also includes:

[0073] S40. Place 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 Figure 9 Replace the universal milling head 4 with the machining tool 5. Place the end face of the machining tool 5 against the end face of the inclined pipe nozzle. According to the Z value, reset the Z-axis 0 position of the second coordinate system through the machine tool program to obtain the final machining coordinate system. At this point, the coordinate system and 0 position setting of the universal milling head 4 for machining the branch pipe nozzle in the tool clamping state are completed.

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

[0076] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A method for establishing a milling coordinate system for an irregularly shaped part with branch nozzles, wherein the part is hemispherical and has two branch nozzles and two circular ramps on its outer contour, and four square bosses evenly distributed at 90° around its perimeter, wherein each square boss has a top surface, two parallel side surfaces, and a front surface, the top surface being parallel to the bottom plane of the part, and the two side surfaces and the front surface being perpendicular to the bottom plane of the part, characterized in that... The method includes: S10. Obtain a blank, the blank having a bottom plane, an outer circular surface, four square bosses and a branch nozzle blank. Use a vertical lathe to finish the bottom plane and outer circular surface of the blank, and use a milling machine to finish the upper end face, two side end faces and front end face of the square bosses, as well as the end face of the branch nozzle blank. S20. Use a universal milling head to install the center bar, and determine the initial coordinate system in conjunction with the center of the blank and the end face of the square boss; S30. The blank is rotated to an angle corresponding to the branch nozzle blank by the milling machine turntable, and the initial coordinate system is rotated so that its Z-axis coincides with the center line of the branch nozzle blank to form a second coordinate system; S40. Place the end face of the centering bar 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; replace the universal milling head with a machining tool, place the end face of the machining tool against the end face of the oblique nozzle, and reset 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 irregularly shaped parts with branch nozzles according to claim 1, characterized in that, In S10, a milling machine is used to finish the upper end face, two side end faces, and front end face of the square boss, as well as the end face of the branch pipe blank, including: S11. The blank, after being precision machined on a vertical lathe, is transferred to a milling machine, and the central axis of the blank is made to coincide with the rotation center axis of the milling machine table. S12. Rotate the blank to any position directly opposite the square boss, and set the B-axis to position 0. S13. Mill the top surface, two side surfaces and front surface of the square boss with minimum amount of milling; S14. Install a universal milling head and adjust the angle of the universal milling head to be the same as that of the branch pipe blank. Rotate the blank to the corresponding angle of the branch pipe blank through the turntable, and mill the end face of the branch pipe blank with the minimum amount of machining tool by using the universal milling head.

3. The method for establishing a coordinate system for milling irregularly shaped parts with branch nozzles according to claim 2, characterized in that, S20 uses a universal milling head with a center bar, which, together with the center of the blank and the end face of the square boss, determines the initial coordinate system, including: S21. Rotate the blank to position 0 on the B axis, install the centering bar on the universal milling head, and place the centering bar against the two side end faces of the square boss. Take the middle position of the two positions of the centering bar as position 0 on the X axis. S22. The side of the centering rod is placed against the upper end face of the square boss, and the angle between the centering rod and the upper end face is equal to the angle between the branch nozzle of the part and the central axis of the part. The centering rod is moved down a distance Z to the Z-axis position 0, Z = H0 + D / 2 × SIN(α). S23. The centering rod keeps its angle unchanged, its side is attached to the front end face of the square boss, and the centering rod moves a distance Y towards the center axis of the blank to the Y-axis 0 position, Y=L0+D / 2×COS(α); S24. Establish the initial coordinate system based on the X-axis 0 position, Y-axis 0 position, and 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 ball, α is the angle between the branch nozzle of the part and the central axis of the part, and L0 is the distance between the front end face of the square boss and the center of the blank ball.

4. The method for establishing a coordinate system for milling irregularly shaped parts with branch nozzles according to claim 2, characterized in that, S12 performs fine-tuning by rotation and uses a dial indicator to check the straightness of the front end face of the square boss, in order to determine the position of the blank facing the square boss. The dial indicator is also used to check the B-axis 0 position of the square boss on at least the left and right sides.

5. The method for establishing a coordinate system for milling irregularly shaped parts with branch nozzles according to claim 2, characterized in that, In S14, a dial indicator is used for fixing, and a milling head pressure gauge is used to check the straightness and bevel of the front end face of the square boss, verifying the angle of the universal milling head and ensuring that it is the same as the angle of the branch pipe blank.

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