Pipe deep boring processing wall thickness control process

Abstract

The present application provides a kind of field pipeline deep boring processing wall thickness precision control process, so that the wall thickness of pipeline after processing meets the requirements.The process comprises determining a plurality of measuring points of the processing area of the pipeline;Measuring and recording the wall thickness of each measuring point of the processing area and the corresponding part of the pipeline inner diameter;Determine the cutting amount;The wall thickness of each measuring point before processing minus the corresponding cutting amount is the wall thickness after processing;Wherein determining the cutting amount comprises selecting a reference point in the plurality of measuring points;Make the measuring center line pass through the center of the inner circular surface where the reference point is located;Measure the position of the reference point, and record the reading as Q0;In turn measure and record the position of the remaining measuring points as Q measured;Calculate the cutting amount, the reference point cutting amount=(the inner diameter of the pipeline after processing-the inner diameter of the pipeline before processing) / 2, and the cutting amount of the remaining measuring points=the reference point cutting amount+(Q measured-Q0).

Description

TECHNICAL FIELD

[0001] The present application relates to a pipe deep boring process, in particular to a pipe deep boring wall thickness control process. BACKGROUND

[0002] In the pipe deep boring process, the wall thickness control of the processing area is mainly achieved by the methods of selected point measurement, assumed axis and theoretical calculation. First, the thickness measuring tools such as vernier caliper and ultrasonic thickness gauge are used to measure and record the wall thickness of the pipe in the processing area before processing according to certain rules, and the inner diameter of the pipe is measured and recorded by using the inner diameter micrometer at the corresponding position of the measurement point. Then, the inner wall of the pipe is assumed to be a regular cylinder, the center axis of the inner wall of the pipe is a straight line, and the center line of the deep boring process can be adjusted to completely coincide with the center line of the inner wall of the pipe.

[0003] Based on the above measurement and assumption, the wall thickness is approximately calculated according to the formula: wall thickness after processing = wall thickness before processing - (inner diameter after processing - inner diameter before processing) / 2. This method has low measurement accuracy and is prone to problems of not meeting the requirements of the wall thickness of the pipe after processing.

[0004] The patent specification with the publication number CN104175061A and the invention name of "High-precision counter-sunk blind hole manufacturing process for reactor pressure vessel support" discloses a pipe deep boring process in the field, but does not solve the above technical problems. SUMMARY

[0005] The purpose of the present application is to provide a pipe deep boring wall thickness control process in the field to meet the requirements of the wall thickness of the pipe after processing.

[0006] To achieve the purpose of the pipe deep boring wall thickness control process, the following steps are included:

[0007] Determine a plurality of measurement points of the processing area of the pipe;

[0008] Measure and record the wall thickness of each measurement point of the processing area and the inner diameter of the pipe at the corresponding position;

[0009] Determine the cutting amount;

[0010] The wall thickness after processing is the wall thickness before processing of each measurement point minus the corresponding cutting amount;

[0011] Wherein the determination of the cutting amount includes the following steps:

[0012] Select a reference point in the plurality of measurement points;

[0013] Make the measurement center line pass through the center of the inner circular surface of the reference point;

[0014] Measuring the position of the reference point and recording the reading as Q0;

[0015] Measuring and recording the positions of the rest of the measuring points in order as Qmeasured;

[0016] Calculating the cutting amount, reference point cutting amount = (pipe inner diameter after machining - pipe inner diameter before machining) / 2, and the rest of the measuring points cutting amount = reference point cutting amount + (Qmeasured - Q0).

[0017] In an embodiment, the reference point is selected according to the wall thickness and / or pipe inner diameter measurement value.

[0018] In an embodiment, the reference point is selected according to the roundness regularity degree of the position where the measuring point is located and / or the estimated machining amount.

[0019] In an embodiment, a dial gauge or a micrometer is used to measure the positions of the measuring points.

[0020] In an embodiment, the step of checking the calculated data of the wall thickness after machining of all the measuring points is further included, and if the calculated data of the position where a measuring point is located is less than the designed minimum wall thickness, the reference point is reselected and the step of determining the cutting amount is re-executed.

[0021] In an embodiment, a circle is selected at a set distance apart along the axis of the machining area, and a plurality of points are selected as the measuring points in each circle.

[0022] In an embodiment, a circle is selected at a set distance apart along the axis of the machining area, and a plurality of points are selected as the measuring points in each circle, and a pipe inner diameter is calculated at the measuring points opposite in the diameter direction, and the roundness regularity degree is determined according to the pipe inner diameters at each position in each circle.

[0023] In an embodiment, an inner boring device is used to determine the cutting amount, including the following steps:

[0024] Installing the inner boring device and performing preliminary debugging and fixing;

[0025] Installing a measuring tool on the tool holder of the inner boring device, measuring and adjusting the inner boring device so that the center line of the device passes through the center of the inner circular surface where the reference point is located;

[0026] Rotating the tool holder of the inner boring device so that the measuring tool measures the position of the reference point and records the reading as (Q0);

[0027] Rotating the tool holder of the inner boring device and lifting the inner boring device to measure and record the readings of the other measuring points (Qmeasured) in order.

[0028] In an embodiment, the step of making the center line of the device pass through the center of the inner circular surface where the reference point is located includes:

[0029] The position of the reference point is measured by the rotary tool holder, and then the position of the opposite point at the other end of the inner diameter is measured, and the inner boring equipment is finely adjusted so that the measured data of the reference point and the opposite point are the same.

[0030] Since the determination of the cutting amount of the plurality of measuring points is based on the measured distance from the machining center line to the inner wall of the pipeline, the machining center line is the center line of the inner wall of the pipeline after machining, so that the machining amount or cutting amount of each point is accurately calculated, the wall thickness before machining at the point is calculated to calculate the machining amount, the wall thickness after machining of each measuring point is accurately calculated, and finally the deviation between the actual machining wall thickness and the calculated wall thickness is controlled, so that the wall thickness of the pipeline after machining meets the requirements. BRIEF DESCRIPTION OF DRAWINGS

[0031] The above and other features, properties, and advantages of the present application will become more apparent by the following description with reference to the accompanying drawings and embodiments, in which:

[0032] Figure 1 A schematic diagram for determining the cutting amount by using the inner boring equipment;

[0033] Figure 2 A transverse sectional view of the pipeline;

[0034] Figure 3 A flowchart of the pipeline deep inner boring machining wall thickness control process;

[0035] Figure 4 A flowchart of the pipeline deep inner boring machining wall thickness control process; Figure 3 A flowchart of the pipeline deep inner boring machining wall thickness control process; DETAILED DESCRIPTION

[0036] The present application will be further described below in conjunction with specific embodiments and drawings, and more details are set forth in the following description in order to fully understand the present application, but the present application can be implemented in various ways other than the description, and those skilled in the art can make similar generalizations and deductions according to the actual application without departing from the scope of the present application, therefore the protection scope of the present application should not be limited by the content of the specific embodiments. It should be noted that these and subsequent other drawings are only examples, not drawn according to the same scale, and should not be used as a limitation on the actual claimed protection scope of the present application.

[0037] As shown in Figure 1 The inner boring equipment includes a tool holder 3, a support device 2, and a shaft 31, the support device 2 is fixedly arranged in the machining area 1 of the pipeline, the shaft 31 is supported by the support device 2 at the end 11 of the pipeline, the tool holder 3 is arranged on the shaft 31 and can be rotated and axially driven, and the dial indicator 4 is installed on the tool holder 3. The following embodiments will be described in conjunction with Figure 1The illustrated device is used as an example, but the implementation of the pipe deep boring machining wall thickness control process is not limited to Figure 1 the illustrated device.

[0038] Referring to Figure 3 , the pipe deep boring machining wall thickness control process includes steps 101 to 104. Step 101 determines the measurement points. In combination Figure 1 , a plurality of measurement points are determined in the machining area 1 of the pipe, for example, in the machining area 1 of the pipe with a length of 250 mm, from the pipe end 11 to the other end 12 of the pipe, taking 12 measurement points 5 in each circle at every 50 mm along the axis 9 of the machining area 1, 6 circles and 72 measurement points 5 are selected. The number of circles and the number of measurement points in each circle can be changed according to different pipe diameters and different control accuracies.

[0039] Step 102 measures the wall thickness, and measures and records the wall thickness (δoriginal) of each measurement point 5 in the machining area 1 and the corresponding position of the pipe inner diameter (Φinner). Figure 2 A transverse cross section of the pipe is shown, in which the pipe wall thickness 6 and the pipe inner diameter 7 are shown. By means of a vernier caliper or an ultrasonic thickness gauge and other measuring tools that can measure thickness, the wall thickness of the pipe wall thickness 6 in the machining area 1 before machining is measured at the measurement points 5 determined in step 101 and recorded, and the inner diameter measuring tool such as an inner diameter micrometer is used to measure and record the pipe inner diameter 7 before machining at the corresponding position of the measurement point 5.

[0040] Step 103 determines the cutting amount, as will be understood from the following description, the cutting amount at the corresponding position of the measurement point 5 at different positions will be different, and it can also be understood that one embodiment of the pipe deep boring machining wall thickness control process is to use Figure 1 the boring equipment and dial gauge 4 shown in the figure to determine the cutting amount.

[0041] One embodiment of step 103 is shown in Figure 4 , which includes steps 201 to 205.

[0042] Step 201 selects the reference point 51, and the reference point 51 is selected from the plurality of measurement points 5 determined in step 101. In one embodiment of the selected reference point 51, the Figure 1The inner boring apparatus and dial gauge 4 shown measure the cutting amount to calculate the pipe inner diameter 7 at the opposite measuring points 51, 52 in the pipe inner diameter direction, determine the regularity of the roundness of each turn based on the pipe inner diameter 7 at the six points 6 in each turn, and then select the reference point 51 based on the regularity of the roundness of the position of the measuring point 5 and the estimated machining amount of the measuring point 5. One way of determining the regularity of the roundness is to determine that the turn in which the measured values of the pipe inner diameter 7 at the six points 6 in the turn in which the measuring point 5 is located are the most even as the turn with the most regular roundness. In another embodiment, a roundness measuring device such as a roundness gauge is used to determine the regularity of the roundness of the position of the measuring point 5. The embodiment of selecting the reference point 51 is not limited to the regularity of the roundness and the estimated machining amount, and other ways of selecting the reference point 51 can be used, such as selecting the reference point 51 based on only the estimated machining amount, or selecting the reference point 51 based on only the most regular roundness, or selecting the reference point 51 based on only the measured value of the wall thickness 6 being close to the design value, or selecting the reference point 51 based on only the measured value of the pipe inner diameter 7, or selecting the reference point 51 based on the measured values of the wall thickness 6 and the pipe inner diameter 7. The selected reference point 51 enables the calculated data of the wall thickness after machining of all the measuring points 5 to be not less than the design minimum wall thickness. In the above examples, the reference point 51 is selected based on the position of the smaller or smallest estimated machining amount, and the smaller estimated machining amount is not the smallest among all the estimated machining amounts, but is smaller than the average estimated machining amount. The reference point 51 is selected based on the regularity of the roundness of the position of the measuring point 5 and the estimated machining amount of the measuring point 5, and thus the beneficial effect is that the reference point 51 can be quickly selected. The reference point 51 is selected based on the measured values of the wall thickness 6 and / or the pipe inner diameter 7, and thus the beneficial effect is that the reference point 51 can be selected using the measured values of the wall thickness 6 and / or the pipe inner diameter 7. Figure 1 The inner boring apparatus and dial gauge 4 shown measure the cutting amount to calculate the pipe inner diameter 7 at the opposite measuring points 51, 52 in the pipe inner diameter direction, determine the regularity of the roundness of each turn based on the pipe inner diameter 7 at the six points 6 in each turn, and then select the reference point 51 based on the regularity of the roundness of the position of the measuring point 5 and the estimated machining amount of the measuring point 5. One way of determining the regularity of the roundness is to determine that the turn in which the measured values of the pipe inner diameter 7 at the six points 6 in the turn in which the measuring point 5 is located are the most even as the turn with the most regular roundness. In another embodiment, a roundness measuring device such as a roundness gauge is used to determine the regularity of the roundness of the position of the measuring point 5. The embodiment of selecting the reference point 51 is not limited to the regularity of the roundness and the estimated machining amount, and other ways of selecting the reference point 51 can be used, such as selecting the reference point 51 based on only the estimated machining amount, or selecting the reference point 51 based on only the most regular roundness, or selecting the reference point 51 based on only the measured value of the wall thickness 6 being close to the design value, or selecting the reference point 51 based on only the measured value of the pipe inner diameter 7, or selecting the reference point 51 based on the measured values of the wall thickness 6 and the pipe inner diameter 7. The selected reference point 51 enables the calculated data of the wall thickness after machining of all the measuring points 5 to be not less than the design minimum wall thickness. In the above examples, the reference point 51 is selected based on the position of the smaller or smallest estimated machining amount, and the smaller estimated machining amount is not the smallest among all the estimated machining amounts, but is smaller than the average estimated machining amount. The reference point 51 is selected based on the regularity of the roundness of the position of the measuring point 5 and the estimated machining amount of the measuring point 5, and thus the beneficial effect is that the reference point 51 can be quickly selected. The reference point 51 is selected based on the measured values of the wall thickness 6 and / or the pipe inner diameter 7, and thus the beneficial effect is that the reference point 51 can be selected using the measured values of the wall thickness 6 and / or the pipe inner diameter 7. Figure 1 The inner boring apparatus and dial gauge 4 shown measure the cutting amount to calculate the pipe inner diameter 7 at the opposite measuring points 51, 52 in the pipe inner diameter direction, determine the regularity of the roundness of each turn based on the pipe inner diameter 7 at the six points 6 in each turn, and then select the reference point 51 based on the regularity of the roundness of the position of the measuring point 5 and the estimated machining amount of the measuring point 5. One way of determining the regularity of the roundness is to determine that the turn in which the measured values of the pipe inner diameter 7 at the six points 6 in the turn in which the measuring point 5 is located are the most even as the turn with the most regular roundness. In another embodiment, a roundness measuring device such as a roundness gauge is used to determine the regularity of the roundness of the position of the measuring point 5. The embodiment of selecting the reference point 51 is not limited to the regularity of the roundness and the estimated machining amount, and other ways of selecting the reference point 51 can be used, such as selecting the reference point 51 based on only the estimated machining amount, or selecting the reference point 51 based on only the most regular roundness, or selecting the reference point 51 based on only the measured value of the wall thickness 6 being close to the design value, or selecting the reference point 51 based on only the measured value of the pipe inner diameter 7, or selecting the reference point 51 based on the measured values of the wall thickness 6 and the pipe inner diameter 7. The selected reference point 51 enables the calculated data of the wall thickness after machining of all the measuring points 5 to be not less than the design minimum wall thickness. In the above examples, the reference point 51 is selected based on the position of the smaller or smallest estimated machining amount, and the smaller estimated machining amount is not the smallest among all the estimated machining amounts, but is smaller than the average estimated machining amount. The reference point 51 is selected based on the regularity of the roundness of the position of the measuring point 5 and the estimated machining amount of the measuring point 5, and thus the beneficial effect is that the reference point 51 can be quickly selected. The reference point 51 is selected based on the measured values of the wall thickness 6 and / or the pipe inner diameter 7, and thus the beneficial effect is that the reference point 51 can be selected using the measured values of the wall thickness 6 and / or the pipe inner diameter 7.

[0043] Step 202 determines the measurement center line 8 so that the measurement center line 8 passes through the center of the inner circle surface in which the reference point 51 is located. The measurement center line 8 is determined based on the reference point 51 and the opposite point 52. Figure 2 For example, one of the measuring points 5 is selected as the reference point 51, and the measuring point 52 is opposite the reference point 51 in the pipe inner diameter direction. In combination with Figure 1 and Figure 2 One embodiment in which the measurement center line 8 passes through the center of the inner circle surface in which the reference point 51 is located includes rotating the inner boring apparatus tool holder 3 to measure the position of the reference point 51, then measuring the position of the opposite point 52 at the other end of the inner diameter opposite the reference point 51, and fine-tuning the inner boring apparatus so that the measured data of the reference point 51 and the opposite point 52 are the same.

[0044] Step 203 measures the position of the reference point 51, and step 204 measures the positions of the remaining measurement points 5. In the embodiment shown in the drawings, the positions of the measurement points 5 are measured by the inner boring equipment and the dial gauge 4. Figure 1 For example, the inner boring equipment is installed and preliminarily adjusted, the dial gauge 4 is installed on the tool holder 3 of the inner boring equipment, the inner boring equipment is measured and adjusted so that the center line of the equipment, i.e. the measurement center line 8, passes through the center of the inner circle surface on which the reference point 51 is located, the tool holder 3 of the inner boring equipment is rotated so that the dial gauge 4 measures the position of the reference point 51, the reading is recorded as (Q0), and the tool holder is rotated to complete the reading of all the measurement points 5 on the circle on which the reference point 51 is located, the tool holder 3 of the inner boring equipment is rotated, and the inner boring equipment is slowly raised and lowered so that the dial gauge 4 is at the next circle of measurement points 5, to measure and record the readings (Qmeasured) of the other measurement points 5 in turn. The axial position of the tool holder 3 of the inner boring equipment is changed during the process of slowly raising and lowering the inner boring equipment.

[0045] Step 205 calculates the cutting amount, the cutting amount of the reference point 51 is (the inner diameter after machining - the inner diameter before machining) / 2, and the cutting amount of the remaining measurement points 5 is the cutting amount of the reference point 51 + (Qmeasured - Q0).

[0046] Returning to Figure 3 , step 104 calculates the wall thickness after machining, i.e. the wall thickness before machining minus the corresponding cutting amount, which is the wall thickness after machining. Optionally, the calculation data of the wall thickness after machining of all the measurement points 5 is checked, and if the calculation data of the position of a measurement point 5 is less than the designed minimum wall thickness, the reference point 51 is reselected, and the steps of determining the cutting amount shown in Figure 4 are re-executed.

[0047] In the foregoing embodiment, the determination of the cutting amount of the plurality of measurement points 5 is based on the measured distance from the machining center line to the inner wall of the pipeline, i.e. the center line of the pipeline after machining, so that the machining amount or cutting amount of each point is accurately calculated, i.e. the wall thickness before machining at the point - the calculated machining amount, and the wall thickness after machining at the point is accurately calculated for each measurement point. This solves the problem in the prior art that the deviation between the actual machining wall thickness and the calculated wall thickness is large because the pipeline inner wall center line is assumed to be a theoretical straight line, and the inner boring machining axis is assumed to be completely coincident with the pipeline inner wall center line. In a pipeline installation project of a certain power plant, the wall thickness of the pipeline is close to the lower limit of the tolerance, and the inner wall of the pipeline is uneven, and there is a certain degree of ovality in the pipeline machining area. The wall thickness after machining calculated by the traditional method has a large error, and the pipeline has a risk of being scrapped. According to the foregoing embodiment, the maximum deviation between the final measured data and the calculated data after machining is only 0.06 mm.

[0048] As shown in Figure 1In the shown embodiment, the dial gauge 4 is selected to measure the positions of the plurality of measuring points 5. The dial gauge 4 is a common tool for installation site, and the internal boring equipment is a necessary equipment for boring, so the aforementioned pipe deep internal boring wall thickness control process does not need to increase the cost, and has high measurement accuracy and reliable measurement results. In other embodiments, a micrometer or other measuring tools can be selected to replace the dial gauge 4.

[0049] The aforementioned pipe deep internal boring wall thickness control process can use the dial gauge 4 as a measuring tool, without additional cost, with high measurement accuracy and reliable measurement results, and the wall thickness processing amount calculation accuracy can be improved to 0.1 mm, to realize accurate control of the pipe wall thickness, and effectively improve the deep internal boring product qualification rate.

[0050] Although the present application is disclosed with the preferred embodiments as above, it is not intended to limit the present application, and any person skilled in the art can make possible changes and modifications without departing from the spirit and scope of the present application. Therefore, any modification, equivalent change and modification made to the above embodiments according to the technical essence of the present application, without departing from the technical solutions of the present application, fall within the protection scope defined by the claims of the present application.

Claims

1. A process for controlling wall thickness in deep inside boring of a pipe, characterized in that, The method comprises: determining a plurality of measuring points of a processing area of a pipeline, with the axis of the processing area selected at a set distance, and a plurality of points selected as measuring points in each circle; measuring and recording the wall thickness of each measuring point of the processing area and the corresponding part of the pipeline inner diameter; determining the cutting amount, comprising: selecting a reference point in the plurality of measuring points; passing the measuring center line through the center of the inner circular surface where the reference point is located; measuring the position of the reference point and recording the reading as Q0; sequentially measuring and recording the positions of the remaining measuring points as Qmeasured; calculating the cutting amount, with the reference point cutting amount=(pipeline inner diameter after processing-pipeline inner diameter before processing) / 2, and the remaining measuring point cutting amount=reference point cutting amount+(Qmeasured-Q0); subtracting the corresponding cutting amount from the wall thickness before processing of each measuring point to obtain the wall thickness after processing; checking the calculation data of the wall thickness after processing of all measuring points, and if the calculation data of the position of a measuring point is less than the designed minimum wall thickness, then reselecting the reference point and re-executing the step of determining the cutting amount, selecting the reference point according to the roundness regularity of the position of the measuring point and the estimated processing amount of the measuring point, so that the calculation data of the wall thickness after processing of all measuring points is not less than the designed minimum wall thickness.

2. The process of claim 1, wherein, Selecting the reference point according to the wall thickness and / or pipeline inner diameter measurement value.

3. The process of claim 1, wherein, Selecting the reference point according to the roundness regularity of the position of the measuring point and / or the estimated processing amount.

4. The process of claim 1, wherein, Selecting a dial gauge or a micrometer to measure the positions of the plurality of measuring points.

5. The process of claim 3, wherein, Selecting a circle with the axis of the processing area at a set distance, and a plurality of points selected as measuring points in each circle, calculating a pipeline inner diameter at a place with the diametrically opposite measuring points, and determining the roundness regularity according to the pipeline inner diameter at each place in each circle.

6. The process of claim 1-4, 5, wherein, Determining the cutting amount by using an internal boring equipment, comprising: installing the internal boring equipment and preliminarily debugging and fixing; installing a measuring tool on the tool holder of the internal boring equipment, measuring and adjusting the internal boring equipment, so that the center line of the equipment passes through the center of the inner circular surface where the reference point is located; rotating the tool holder of the internal boring equipment to make the measuring tool measure the position of the reference point and record the reading as (Q0); rotating the tool holder of the internal boring equipment and lifting the internal boring equipment to sequentially measure and record the readings (Qmeasured) of the other measuring points.

7. The process of claim 6, wherein, The step of passing the center line of the equipment through the center of the inner circular surface where the reference point is located comprises: rotating the tool holder to measure the position of the reference point, then measuring the position of the opposite point at the other end of the inner diameter, and finely adjusting the internal boring equipment so that the measurement data of the reference point and the opposite point are the same.

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