CN113000880B - Automatic drilling method for nuclear power control rod assembly - Google Patents
Automatic drilling method for nuclear power control rod assembly Download PDFInfo
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- CN113000880B CN113000880B CN201911325995.8A CN201911325995A CN113000880B CN 113000880 B CN113000880 B CN 113000880B CN 201911325995 A CN201911325995 A CN 201911325995A CN 113000880 B CN113000880 B CN 113000880B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B35/00—Methods for boring or drilling, or for working essentially requiring the use of boring or drilling machines; Use of auxiliary equipment in connection with such methods
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
Abstract
The invention belongs to the field of manufacturing of nuclear power related components, and particularly relates to an automatic drilling method for a nuclear power control rod component. Dividing the control rod assembly into a plurality of identical parts, dividing the control rod assembly into groups, taking one radial direction of one group as a datum line, determining the drilling sequence on each group of control rods, sequentially processing the holes of the first group, then returning to the datum line, assembling pins, sequentially processing the holes of each group, returning to the datum line after each group of holes are processed, assembling pins, and knowing that the drilling of the control rods in all groups is finished. The method is different from the existing drilling sequence, can greatly improve the drilling precision, prevent the product quality problem caused by human errors, optimize the drilling process, ensure the stability and reliability of the product, and has the advantages of low implementation cost and small error.
Description
Technical Field
The invention belongs to the field of manufacturing of nuclear power related components, and particularly relates to an automatic drilling method for a nuclear power control rod component.
Background
The control rod assembly has functions for reactor start-up, shutdown, changing stack power and protecting the reactor. Specifically, core reactivity control is provided during reactor operation to alter the reactor power, coolant temperature, or boron concentration; the normal shutdown is realized by gradually inserting the control rods into the fuel assemblies; the control rod is quickly inserted into the fuel assembly by self gravity to realize emergency shutdown, and the rod falling time meets the time requirement specified by the safety analysis of the reactor core; supporting the control rods to align the control rods with the alignment of the guide tubes in the fuel assembly; absorbing the residual energy at the tail end of the falling rod stroke so as to prevent impact damage to the fuel assembly and the springs in the star frame; the accurate axial position is determined integrally with the driving shaft; the visible portions of the star frame are marked for easy identification, etc.
The control rod assembly consists of 1 connecting handle (1), 4 control rods (20), 2 guide nuts (20) and 20 pins (20), and the schematic diagram is shown in figure 1. The guide nut 2 is connected with the control rod 4 through threads, so as to prevent the control rod 4 from being connected with the connecting handle 1 loose, the drilling position 3 is arranged outside the guide nut, holes are drilled, and the inserted pins are welded and fixed.
The main manufacturing process flow of the control rod assembly is as follows: the method comprises the steps of installing a control rod into a hole of a connecting handle, fixing the control rod and the connecting handle by using a guide nut, drilling the guide nut and the control rod, adjusting the position of the control rod timely according to the drilling condition, assembling pins and welding.
In the existing drilling manufacturing method, the positions of the holes to be drilled are divided into 4 planes (as shown in fig. 2, the arrow direction is the downward drilling direction), and the holes are drilled in pairs, wherein the number of the holes is 7 and 3. And (3) moving the precision bench drill to the position right above a control rod to be drilled, confirming that the control rod is drilled by a handle of the manual bench drill after the precision bench drill is correct, and stopping drilling after the hole depth reaches a specified depth. And no cooling liquid is added in the whole drilling process. The process has low drilling precision and low automation level, and the risk of product quality problems caused by human errors exists.
Disclosure of Invention
The invention aims to provide an automatic drilling method for a nuclear power control rod assembly, which can realize the centering and drilling of 24 guide nuts after the connecting handle, the control rod and the guide nuts are assembled, and greatly improves the precision.
The technical scheme of the invention is as follows:
an automatic drilling method for a nuclear power control rod assembly, comprising the following steps:
1) Dividing the control rod assembly into a plurality of identical parts, and dividing the control rod assembly into groups;
2) Determining a reference line
Taking one radial direction of one group as a datum line
3) Determining a drilling sequence on each set of control rods;
4) Sequentially machining holes of a first group, returning to the datum line, assembling pins, sequentially machining holes of each group, returning to the datum line after the holes of each group are machined, and assembling pins until drilling of control rods in all groups is finished.
Said step 1) dividing the control rod assembly into 4 identical parts, in particular
The control rod assemblies are divided into four groups in the overlooking direction, each group comprises 5 control rods, wherein 2 control rods are positioned in the same radial direction, and the other three control rods are respectively positioned in the respective radial directions, and the interval angles of the four radial directions are the same;
the step 2) is to determine a datum line, in particular
Taking 2 control rods in one group of control rods in the same radial direction as a datum line, wherein the group of control rods is defined as a 0-degree group;
then the next group of 2 radial direction-90-degree group is defined by rotating clockwise or anticlockwise;
then rotating to 180 degrees in the same radial direction of the 2 roots of the third group, and 270 degrees in the same radial direction of the 2 roots of the fourth group; defined as the 180 deg. group and 270 deg. group, respectively.
Said 3) determining the order of drilling holes in each set of control rods
Firstly, drilling holes on two control rods No. 1 and No. 2 which are positioned in the same radial direction, wherein the No. 1 is positioned at the outer side in the radial direction, and the No. 2 is positioned at the inner side in the radial direction;
then processing the No. 3, the No. 4 and the No. 5 in sequence according to the anticlockwise direction;
the driller's position is on the guide nut at the top end of the control rod.
And (3) processing 5 holes of the 0-degree group in the sequence of the step (3) in the datum line positioning drill bit, then returning to the datum line, assembling pins, processing 5 holes of the 90-degree group again, then returning to the datum line, assembling pins, processing 5 holes of the 180-degree group again, then returning to the datum line, assembling pins, and processing 5 holes of the 270-degree group again.
And 5) optimizing the drilling, namely after determining the drilling position, performing small-aperture trial drilling, drilling to the threaded connection position of the guide nut, lifting the drill bit, performing small-aperture drilling again, deepening the drilling to the maximum drilling depth, and finally performing large-aperture reaming drilling to the maximum drilling depth.
And step 5 is to measure the control rod to determine the drilling position, then drill the control rod for phi 1.9 mm, drill the drill depth to the threaded connection position of the guide nut, lift the drill bit for 3mm, drill the control rod for phi 1.9 mm, drill the control rod for phi 5 mm, and finally ream the control rod for phi 2 mm and the drill depth for 5 mm.
The invention has the following remarkable effects: the drilling process designed by the method is different from the existing drilling sequence, can greatly improve the drilling precision, prevent the product quality problem caused by human errors, optimize the drilling process, ensure the stability and reliability of the product by small-aperture trial drilling and large-aperture expanding drilling to the required depth, has simple operation, low realization cost and small error,
examination of the pin holes, the size is +.>
Drawings
FIG. 1 is a schematic diagram of a control rod assembly;
FIG. 2 is a schematic illustration of a manual drilling of a control rod assembly;
FIG. 3 is a schematic illustration of an automatic drilling method for a nuclear power control rod assembly;
in the figure: 1-a connecting handle; 2-a guide nut; 3-drilling position (fitting pins); 4-control rod.
Detailed Description
The invention is further illustrated by the following figures and detailed description.
1) Dividing the control rod assembly into 4 identical sections
As shown in fig. 3, the control rod assemblies are divided into four groups in a top view, each group including 5 control rods, 2 of which are located in the same radial direction, and the other three of which are located in respective radial directions, and the interval angles of the four radial directions are the same.
2) Determining a reference datum
Taking 2 control rods in one group of control rods in the same radial direction as a datum line, wherein the group of control rods is defined as a 0-degree group;
then the next group of 2 radial direction-90-degree group is defined by rotating clockwise or anticlockwise;
then rotating to 180 degrees in the same radial direction of the 2 roots of the third group, and 270 degrees in the same radial direction of the 2 roots of the fourth group; defined as 180 ° group and 270 ° group, respectively;
3) Determining the order of drilling holes in each set of control rods
As shown in fig. 3, the dashed box is a set of control rods. The meaning of the reference numerals is: marking the control rods according to the processing sequence;
firstly, drilling holes on the No. 1 and No. 2 control rods positioned in the same radial direction, wherein the driller is positioned on a guide nut at the top end of the control rod; the number 1 is positioned at the outer side in the radial direction, and the number 2 is positioned at the inner side in the radial direction;
and then sequentially processing the No. 3, the No. 4 and the No. 5 in a counterclockwise direction. The driller is positioned on the guide nut at the top end of the control rod;
(the method mainly aims at determining the sequence, and the position and the processing mode are all the prior art and are not repeated in detail
4) And (3) processing 5 holes of the 0-degree group in the sequence of the step (3) in the datum line positioning drill bit, then returning to the datum line, assembling pins, processing 5 holes of the 90-degree group again, then returning to the datum line, assembling pins, processing 5 holes of the 180-degree group again, then returning to the datum line, assembling pins, and processing 5 holes of the 270-degree group again.
5) Borehole optimization
After the drilling position is determined, small-aperture test drilling is carried out, the drill is lifted up to the threaded connection position of the guide nut, then small-aperture drilling is carried out again, the drilling is deepened to the maximum drilling depth, and finally, large-aperture reaming drilling is carried out, and the depth reaches the maximum drilling depth.
After measuring and determining the drilling position of the control rod, firstly performing phi 1.9 mm drilling, drilling to the threaded connection position of the guide nut, lifting the drill bit for 3mm, then performing phi 1.9 mm drilling, drilling to 5 mm, and finally performing phi 2 mm reaming and hole depth of 5 mm.
The rotation speed is 1000 revolutions per minute, and the feeding amount is 15 mm/s. And in the drilling process, the drill is always drilled down to a specified depth, and the drill bit is lifted in time to cool and remove scrap iron in the process.
Claims (4)
1. An automatic drilling method for a nuclear power control rod assembly is characterized by comprising the following steps:
1) Dividing the control rod assembly into a plurality of identical parts, and dividing the control rod assembly into groups;
2) Determining a reference line
Taking one radial direction of one group as a datum line
3) Determining a drilling sequence on each set of control rods;
4) Sequentially machining holes of a first group, returning to the datum line, assembling pins, sequentially machining holes of each group, returning to the datum line after the holes of each group are machined, and assembling pins until drilling of control rods in all groups is finished;
said step 1) dividing the control rod assembly into 4 identical parts, in particular
The control rod assemblies are divided into four groups in the overlooking direction, each group comprises 5 control rods, wherein 2 control rods are positioned in the same radial direction, and the other three control rods are respectively positioned in the respective radial directions, and the interval angles of the four radial directions are the same;
the step 2) is to determine a datum line, in particular
Taking 2 control rods in one group of control rods in the same radial direction as a datum line, wherein the group of control rods is defined as a 0-degree group;
then the next group of 2 radial direction-90-degree group is defined by rotating clockwise or anticlockwise;
then rotating to 180 degrees in the same radial direction of the 2 roots of the third group, and 270 degrees in the same radial direction of the 2 roots of the fourth group; defined as 180 ° group and 270 ° group, respectively;
said 3) determining the order of drilling holes in each set of control rods
Firstly, drilling holes on two control rods No. 1 and No. 2 which are positioned in the same radial direction, wherein the No. 1 is positioned at the outer side in the radial direction, and the No. 2 is positioned at the inner side in the radial direction;
then processing the No. 3, the No. 4 and the No. 5 in sequence according to the anticlockwise direction;
the driller's position is on the guide nut at the top end of the control rod.
2. An automatic drilling method for a nuclear power control rod assembly as defined in claim 1, wherein: and (3) processing 5 holes of the 0-degree group in the sequence of the step (3) in the datum line positioning drill bit, then returning to the datum line, assembling pins, processing 5 holes of the 90-degree group again, then returning to the datum line, assembling pins, processing 5 holes of the 180-degree group again, then returning to the datum line, assembling pins, and processing 5 holes of the 270-degree group again.
3. An automatic drilling method for a nuclear power control rod assembly as defined in claim 1, wherein: and 5) optimizing the drilling, namely after determining the drilling position, performing small-aperture trial drilling, drilling to the threaded connection position of the guide nut, lifting the drill bit, performing small-aperture drilling again, deepening the drilling to the maximum drilling depth, and finally performing large-aperture reaming drilling to the maximum drilling depth.
4. An automatic drilling method for a nuclear power control rod assembly as claimed in claim 3, wherein: and step 5 is to measure the control rod to determine the drilling position, then drill the control rod for phi 1.9 mm, drill the drill depth to the threaded connection position of the guide nut, lift the drill bit for 3mm, drill the control rod for phi 1.9 mm, drill the control rod for phi 5 mm, and finally ream the control rod for phi 2 mm and the drill depth for 5 mm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911325995.8A CN113000880B (en) | 2019-12-20 | 2019-12-20 | Automatic drilling method for nuclear power control rod assembly |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911325995.8A CN113000880B (en) | 2019-12-20 | 2019-12-20 | Automatic drilling method for nuclear power control rod assembly |
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| CN113000880A CN113000880A (en) | 2021-06-22 |
| CN113000880B true CN113000880B (en) | 2023-05-30 |
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| JPH11226809A (en) * | 1998-02-16 | 1999-08-24 | Mitsubishi Heavy Ind Ltd | Drilling machining device for installing bar-like member |
| CN102797465A (en) * | 2012-09-10 | 2012-11-28 | 河南理工大学 | Underground ultra-thin virtual protection layer hydraulic coal mining method |
| TW201330004A (en) * | 2011-12-28 | 2013-07-16 | Ge Hitachi Nucl Energy America | Systems and methods for processing irradiation targets through a nuclear reactor |
| CN203843236U (en) * | 2014-04-02 | 2014-09-24 | 含山县清溪镇天翔铸造厂 | Motor end cover punching device |
| CN104335287A (en) * | 2012-06-07 | 2015-02-04 | 西屋电气有限责任公司 | Nuclear control rod with flexure joint |
| CN104723020A (en) * | 2013-12-18 | 2015-06-24 | 中核建中核燃料元件有限公司 | Connection handle base body machining process |
| CN104785811A (en) * | 2015-05-11 | 2015-07-22 | 大族激光科技产业集团股份有限公司 | Micro-hole machining method |
| CN105772785A (en) * | 2014-12-26 | 2016-07-20 | 中核建中核燃料元件有限公司 | Pin hole drilling device for control rod assembly |
| CN107971519A (en) * | 2016-10-25 | 2018-05-01 | 波音公司 | Leading assembling aircraft panels hole-drilling system |
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2019
- 2019-12-20 CN CN201911325995.8A patent/CN113000880B/en active Active
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1506279A (en) * | 1975-12-22 | 1978-04-05 | Promecan Sisson Lehmann | Device for controlling a movable member on a machine tool |
| JPH11226809A (en) * | 1998-02-16 | 1999-08-24 | Mitsubishi Heavy Ind Ltd | Drilling machining device for installing bar-like member |
| TW201330004A (en) * | 2011-12-28 | 2013-07-16 | Ge Hitachi Nucl Energy America | Systems and methods for processing irradiation targets through a nuclear reactor |
| CN104335287A (en) * | 2012-06-07 | 2015-02-04 | 西屋电气有限责任公司 | Nuclear control rod with flexure joint |
| CN102797465A (en) * | 2012-09-10 | 2012-11-28 | 河南理工大学 | Underground ultra-thin virtual protection layer hydraulic coal mining method |
| CN104723020A (en) * | 2013-12-18 | 2015-06-24 | 中核建中核燃料元件有限公司 | Connection handle base body machining process |
| CN203843236U (en) * | 2014-04-02 | 2014-09-24 | 含山县清溪镇天翔铸造厂 | Motor end cover punching device |
| CN105772785A (en) * | 2014-12-26 | 2016-07-20 | 中核建中核燃料元件有限公司 | Pin hole drilling device for control rod assembly |
| CN104785811A (en) * | 2015-05-11 | 2015-07-22 | 大族激光科技产业集团股份有限公司 | Micro-hole machining method |
| CN107971519A (en) * | 2016-10-25 | 2018-05-01 | 波音公司 | Leading assembling aircraft panels hole-drilling system |
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