On-site centering processing technology for large flange

Abstract

A process for on-site center alignment of a large flange, belonging to the field of machining technology. The invention includes the following processing steps: S1. Machining the first arc surface and dovetail groove of the large flange using a machine tool; S2. Placing a measuring reference fixture within the dovetail groove; S3. Determining the center position of the circular hole in the measuring reference fixture; S4. Measuring the distance L1 between the center of the measuring reference fixture and the origin of the large flange; S5. After moving the machine tool, re-measuring the center coordinates of the reference fixture; S6. Calculating the angle α between the line L2 connecting the origin of the large flange and the new center of the measuring reference fixture and the Y-axis in the new coordinate system; S7. Fitting the center position of the machine tool in the new coordinate system based on the data detected in S6; S8. Machining based on the arc parameters and the calculated center position of the machine tool. This invention uses machine tool machining to align the center, providing a novel technical concept for flange manufacturing, achieving greater precision, efficiency, and convenience.

Description

Technical Field

[0001] This invention belongs to the field of machining technology, and in particular relates to an on-site machining process for large flanges. Background Technology

[0002] Currently, most large vacuum containers in my country are manufactured in sections and then transported to the equipment installation site for assembly and welding. Due to the heat deformation during welding, the flatness of the flange end face deteriorates, directly affecting the container's sealing performance. The flanges require secondary on-site machining. Traditional flange machining on-site uses cantilever structures and machining tools, allowing only fixed-length machining. When machining uneven flange surfaces, alignment is impossible, resulting in low machining accuracy. Summary of the Invention

[0003] The purpose of this invention is to provide an on-site processing technology for large flanges to solve the problems existing in the prior art.

[0004] The technical solution adopted in this invention is: a process for on-site center alignment of a large flange, characterized by the following processing steps:

[0005] S1. Machine tool processing of the first section of the arc-shaped upper surface and the dovetail groove of the large flange;

[0006] S2. Place the measuring reference fixture in the dovetail groove and fasten it to the large flange using the nuts on the measuring reference fixture;

[0007] S3. Use the probe on the machine tool to determine the center position of the circular hole of the measuring reference fixture as the reference point;

[0008] S4. The machine tool automatically measures the distance L1 between the center of the measuring reference fixture and the origin of the large flange;

[0009] S5. After moving the machine tool counterclockwise, remeasure the center position of the circular hole of the reference test fixture in the newly established coordinate system, i.e., the center coordinates.

[0010] S6. The system automatically calculates the angle α between the line L2 connecting the origin of the large flange and the center of the new measurement reference tooling and the Y-axis in the new coordinate system;

[0011] S7. Fit the center position of the machine tool in the new coordinate system based on the data detected in S6;

[0012] S8. Perform machining based on the arc parameters and the calculated center position of the machine tool;

[0013] S9. Repeat steps S1, S2, S3, S4, S5, S6, S7, and S8 until the processing is complete.

[0014] The beneficial effects of this invention are as follows:

[0015] This invention changes the original production conditions and makes up for the defects of the original production process. It uses a machine tool to align the center, providing a brand-new technical concept for flange processing and production, and giving a new direction. It has higher accuracy than traditional manual alignment, and can achieve the purpose of processing and inspecting large flanges more accurately, efficiently and conveniently. Attached Figure Description

[0016] Figure 1 This is a schematic diagram illustrating the first determination of the center position of the circular hole in the measuring reference tooling according to the present invention;

[0017] Figure 2 This is a schematic diagram illustrating the position of the center of the circular hole in the measuring reference tooling for the second determination in this invention;

[0018] Among them: 1. Large flange; 2. Machine tool. Detailed Implementation

[0019] like Figure 1 , Figure 2 As shown, this invention mainly processes the upper end face of 5-15 meter flanges and the sealing dovetail groove. It employs a segmented processing and integral splicing method.

[0020] Work process:

[0021] 1. The material borrowing position is given by the tracking instrument, the flange machine tool is adjusted to determine the flange center for the first time and set as the workpiece coordinate system g54 in the machine tool.

[0022] 2. After the machine tool mills the first arc on the right side of the machining area, it places and straightens the measuring reference fixture on the left side. The machine tool subroutine uses the pilot head to measure the position of the fixture hole of the measuring reference fixture (in G54 coordinates) and transmits the coordinate value to the variable ab. The value L of the hypotenuse length of the vector is obtained, and the angle thita1 between the line connecting the center of the circle to the reference point of the measuring reference fixture and the Y-axis is calculated.

[0023] 3. Move the machine tool to the new position and adjust it. The positions of the flange origin and the measurement reference fixture reference point remain unchanged before and after the movement. In the subroutine, set the tooling hole to g55. Use the probe to measure the coordinates of the tooling reference point in the new coordinate system, and calculate the angle α between the line connecting the flange origin and the test tooling reference point and the Y-axis in the new coordinate system. Based on the coordinates (x, y) of the tooling reference point in the new coordinate system, the angle α, and the fixed side length L, the center coordinates can be derived as follows:

[0024] Xo=x-Lsinα

[0025] Yo = y - Lcosα

[0026] (Xo and Yo are the center positions)

[0027] After calculating the center of the circle, the origin of the machine tool program can be set at (Xo, Yo). Working process:

[0028] S1. Machine tool 2 processes the first section of the arc upper surface and the dovetail groove of the large flange 1;

[0029] S2. Place the measuring reference fixture in the dovetail groove and fasten it to the large flange 1 using the nuts on the measuring reference fixture; the measuring reference fixture adopts existing technology.

[0030] S3. Use the probe on machine tool 2 to determine the center position of the circular hole of the measuring reference fixture as the reference point;

[0031] S4. Machine tool 2 automatically measures the distance L1 between the center of the measuring reference fixture and the origin of the large flange 1;

[0032] S5. After moving machine tool 2 counterclockwise, remeasure the center position of the circular hole of the reference test fixture in the newly created coordinate system, i.e., the center coordinates;

[0033] S6. The system automatically calculates the angle α between the origin of the large flange 1 and the line L2 connecting the center of the new measurement reference tooling and the Y-axis in the new coordinate system;

[0034] S7. Fit the center position of machine tool 2 in the new coordinate system based on the data detected in S6;

[0035] S8. Perform machining based on the arc parameters and the calculated center position of machine tool 2;

[0036] S9. Repeat steps S1, S2, S3, S4, S5, S6, S7, and S8 until the processing is complete.

[0037] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A process for on-site center alignment of a large flange, characterized in that: The following processing steps are included: S1. Machine tool (2) processes the first arc upper surface and dovetail groove of large flange (1); S2. Place the measuring reference fixture in the dovetail groove and fasten it to the large flange (1) using the nuts on the measuring reference fixture; S3. Use the probe on the machine tool (2) to determine the center position of the circular hole of the measuring reference tool as the reference point; S4. The machine tool (2) automatically measures the distance L1 between the center of the measuring reference fixture and the origin of the large flange (1); S5. After moving the machine tool counterclockwise (2), remeasure the center position of the circular hole of the reference test fixture in the newly created coordinate system, i.e., the center coordinate; S6. The system automatically calculates the angle α between the origin of the large flange (1) and the line L2 connecting the center of the new measurement reference tooling circle and the Y-axis in the new coordinate system; S7. Fit the center position of the machine tool (2) in the new coordinate system based on the data detected in S6; S8. Perform machining based on the arc parameters and the calculated center position of the machine tool (2); S9. Repeat steps S1, S2, S3, S4, S5, S6, S7, and S8 until processing is complete. In S8, by measuring the coordinates (x, y) of the center position of the circular hole of the reference fixture in the new coordinate system, the included angle α, and the fixed side length L, the center coordinates can be obtained as follows: Xo=x-Lsinα Yo = y - Lcosα Where: (Xo, Yo) is the center position of the machine tool (2), L = L1 = L2.

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