CN113000880A - 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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- CN113000880A CN113000880A CN201911325995.8A CN201911325995A CN113000880A CN 113000880 A CN113000880 A CN 113000880A CN 201911325995 A CN201911325995 A CN 201911325995A CN 113000880 A CN113000880 A CN 113000880A
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- drilling
- group
- control rod
- rod assembly
- holes
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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 nuclear power related assembly manufacturing, and particularly relates to an automatic drilling method for a nuclear power control rod assembly. The control rod assembly is divided into a plurality of identical parts which are divided into groups, one radial direction of one group is taken as a datum line, the drilling sequence on each group of control rods is determined, the holes of the first group are sequentially machined, then the datum line is returned, the pins are assembled, the holes of each subsequent group are sequentially machined, the datum line is returned after the holes of each group are machined, the pins are assembled, and the drilling of the control rods in all the groups is finished. The drilling process is optimized, small-aperture pilot drilling and large-aperture expanding drilling are carried out to the required depth, the stability and reliability of products are guaranteed, the operation is simple, the implementation cost is low, and the error is small.
Description
Technical Field
The invention belongs to the field of nuclear power related assembly manufacturing, and particularly relates to an automatic drilling method for a nuclear power control rod assembly.
Background
The control rod assembly has functions for reactor start-up, shutdown, altering stack power, and protecting the reactor. Specifically, core reactivity control is provided during reactor operation to alter reactor power, coolant temperature, or boron concentration; effecting a normal shutdown by progressively inserting control rods into the fuel assembly; 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 reactor core safety analysis; supporting the control rods so that the arrangement of the control rods is consistent with the arrangement of the guide tubes in the fuel assembly; absorbing the residual energy at the tail end of the rod falling stroke to prevent impact damage to the fuel assembly and the spring in the star frame; the driving shaft is coupled into a whole to determine the accurate axial position; and marking the visible part of the star frame so as to facilitate identification and the like.
The control rod assembly consists of connecting handles 1 (1), control rods 4 (20), guide nuts 2 (20) and pins (20), and the schematic diagram is shown in the attached drawing 1. The guide nut 2 is connected with the control rod 4 through threads, and in order to prevent the control rod 4 from being connected with the connecting handle 1 loosely, the drilling position 3 is drilled outside the guide nut and is welded and fixed by inserting a pin.
The main manufacturing process flow of the control rod assembly is as follows: the control rod is arranged in the hole of the connecting handle → the control rod and the connecting handle are fixed by the guide nut → the guide nut and the control rod are drilled, and the position of the control rod is adjusted according to the drilling condition at proper time → the pin is assembled → the welding is carried out.
The existing drilling method is to divide the position of the required drilling hole into 4 planes (as shown in fig. 2, the arrow direction is the drilling direction), and drill the hole respectively, wherein the two are symmetrical, and the number of the drilled holes is 7 and 3 respectively. And moving the precision bench drill to be right above the control rod to be drilled, after confirming that no error exists, manually controlling a handle of the bench drill to drill the control rod, and stopping drilling when the hole depth reaches the specified depth. No cooling liquid is added in the whole drilling process. The drilling precision of the process is low, the automation level is low, 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 that 24 guide nuts are subjected to centering and drilling after a connecting handle, a control rod and the guide nuts are assembled, and the precision is greatly improved.
The technical scheme of the invention is as follows:
an automatic drilling method for a nuclear power control rod assembly comprises the following steps:
1) dividing the control rod assembly into a plurality of identical parts, and dividing the identical parts into groups;
2) determining a reference line
With one radial direction of one of the groups as a reference line
3) Determining a drilling sequence on each set of control rods;
4) and sequentially processing the holes of the first group, returning to the datum line, assembling the pins, sequentially processing the holes of each subsequent group, returning to the datum line after each group of holes are processed, and assembling the pins until the drilling of the control rods in all the groups is finished.
The step 1) is to divide the control rod assembly into 4 same parts, specifically to
The control rod assemblies are divided into four groups in the overlooking direction, each group comprises 5 control rods, 2 of the control rods are positioned in the same radial direction, 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) determines a reference line, specifically
The direction of 2 control rods in one group of control rods in the same radial direction is taken as a datum line, and the group of control rods is defined as a 0-degree group;
then clockwise or counterclockwise rotation to the next group with 2 in the same radial direction is the 90 ° position, and this group defines the 90 ° group;
then, the direction of the 2 roots in the third group in the same radial direction is 180 degrees, and the direction of the 2 roots in the fourth group in the same radial direction is 270 degrees; defined as 180 deg. and 270 deg. groups, respectively.
3) determining the drilling sequence of each group 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 on the outer side in the radial direction, and the No. 2 is positioned on the inner side in the radial direction;
then processing No. 3, No. 4 and No. 5 in sequence in the anticlockwise direction;
the roughneck is positioned on the guide nut at the control rod tip.
And (3) machining 5 holes of the 0-degree group in the datum line positioning drill according to the sequence in the step 3), then returning to the datum line, assembling the pin, machining 5 holes of the 90-degree group, then returning to the datum line, assembling the pin, machining 5 holes of the 180-degree group, then returning to the datum line, assembling the pin, and machining 5 holes of the 270-degree group.
And 5) drilling optimization, namely after the drilling empty position is determined, performing small-aperture pilot drilling, drilling to the threaded connection part of the guide nut, lifting the drill bit, then performing small-aperture drilling again, deepening the drill to the maximum drilling depth, and finally performing large-aperture reaming drilling to the maximum drilling depth.
And 5, after the control rod is measured and the drilling position is determined, drilling of 1.9 mm in depth to the threaded connection position of the guide nut, lifting of the drill by 3mm, drilling of 1.9 mm in depth to 5 mm in depth, and finally reaming of 2 mm in depth to 5 mm in depth.
The invention has the following remarkable effects: the drilling process designed by the method is different from the existing drilling sequence, can greatly drill the hole, and prevents products caused by human errorsThe quality problem, the drilling process is optimized, the small-aperture pilot drilling and the large-aperture expanding drilling are carried out to the required depth, the stability and the reliability of the product are ensured, the operation is simple, the realization cost is low, the error is small,
inspection of the pin holes, the dimensions being
Drawings
FIG. 1 is a schematic view of a control rod assembly;
FIG. 2 is a schematic view of a control rod assembly being manually drilled;
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 (assembly pin); 4-control rod.
Detailed Description
The invention is further illustrated by the accompanying drawings and the detailed description.
1) The control rod assembly is divided into 4 identical parts
As shown in fig. 3, the control rod assemblies are divided into four groups in a top view, each group comprises 5 control rods, 2 of the control rods are located in the same radial direction, the other three control rods are respectively located in respective radial directions, and the interval angles of the four radial directions are the same.
2) Determining a reference line
The direction of 2 control rods in one group of control rods in the same radial direction is taken as a datum line, and the group of control rods is defined as a 0-degree group;
then clockwise or counterclockwise rotation to the next group with 2 in the same radial direction is the 90 ° position, and this group defines the 90 ° group;
then, the direction of the 2 roots in the third group in the same radial direction is 180 degrees, and the direction of the 2 roots in the fourth group in the same radial direction is 270 degrees; defined as 180 ° and 270 ° groups, respectively;
3) determining the order of drilling holes in each group of control rods
As shown in fig. 3, the dashed box is a set of control rods. The meaning of the reference numbers is: according to the processing sequence, the control rods are marked;
firstly, drilling holes in two control rods No. 1 and No. 2 in the same radial direction, wherein the driller is positioned on a guide nut at the top end of the control rods; no. 1 is positioned at the outer side of the radial direction, and No. 2 is positioned at the inner side of the radial direction;
then, No. 3, No. 4 and No. 5 were processed in the counterclockwise direction in this order. The driller is positioned on the guide nut at the top end of the control rod;
(the method mainly consists in determining the sequence, the position and the processing mode in the prior art and no further description is given)
4) And (3) machining 5 holes of the 0-degree group in the datum line positioning drill according to the sequence in the step 3), then returning to the datum line, assembling the pin, machining 5 holes of the 90-degree group, then returning to the datum line, assembling the pin, machining 5 holes of the 180-degree group, then returning to the datum line, assembling the pin, and machining 5 holes of the 270-degree group.
5) Drilling optimization
After the drilling empty position is determined, small-aperture pilot drilling is carried out, the pilot drilling is carried out until the threaded connection position of the guide nut, the drill bit is lifted, 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 until the drilling depth reaches the maximum drilling depth.
After the control rod is measured to determine the drilling position, drilling of 1.9 mm is carried out, the drilling depth is carried out until the drilling depth reaches the threaded connection position of the guide nut, the drill bit is lifted by 3mm, then drilling of 1.9 mm is carried out, the drilling depth is carried out until 5 mm, and finally hole expansion of 2 mm is carried out, wherein the hole depth is 5 mm.
The rotation speed is 1000 revolutions per minute, and the feeding amount is 15 mm/s. And (3) drilling the hole to a specified depth all the time in the drilling process, and timely lifting the drill bit to cool and remove scrap iron in the process.
Claims (7)
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 identical parts into groups;
2) determining a reference line
With one radial direction of one of the groups as a reference line
3) Determining a drilling sequence on each set of control rods;
4) and sequentially processing the holes of the first group, returning to the datum line, assembling the pins, sequentially processing the holes of each subsequent group, returning to the datum line after each group of holes are processed, and assembling the pins until the drilling of the control rods in all the groups is finished.
2. The method of automatically drilling a hole in a nuclear power control rod assembly of claim 1, wherein:
the step 1) is to divide the control rod assembly into 4 same parts, specifically to
The control rod assemblies are divided into four groups when viewed from the top, each group comprises 5 control rods, 2 of the control rods are located in the same radial direction, the other three control rods are respectively located in the respective radial directions, and the interval angles of the four radial directions are the same.
3. The automatic drilling method for a nuclear power control rod assembly as set forth in claim 2, wherein:
the step 2) determines a reference line, specifically
The direction of 2 control rods in one group of control rods in the same radial direction is taken as a datum line, and the group of control rods is defined as a 0-degree group;
then clockwise or counterclockwise rotation to the next group with 2 in the same radial direction is the 90 ° position, and this group defines the 90 ° group;
then, the direction of the 2 roots in the third group in the same radial direction is 180 degrees, and the direction of the 2 roots in the fourth group in the same radial direction is 270 degrees; defined as 180 deg. and 270 deg. groups, respectively.
4. The method of automatically drilling a hole in a nuclear power control rod assembly of claim 3, wherein:
3) determining the drilling sequence of each group 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 on the outer side in the radial direction, and the No. 2 is positioned on the inner side in the radial direction;
then processing No. 3, No. 4 and No. 5 in sequence in the anticlockwise direction;
the roughneck is positioned on the guide nut at the control rod tip.
5. The method of automatically drilling a hole in a nuclear power control rod assembly of claim 4, wherein: and (3) machining 5 holes of the 0-degree group in the datum line positioning drill according to the sequence in the step 3), then returning to the datum line, assembling the pin, machining 5 holes of the 90-degree group, then returning to the datum line, assembling the pin, machining 5 holes of the 180-degree group, then returning to the datum line, assembling the pin, and machining 5 holes of the 270-degree group.
6. The method of automatically drilling a hole in a nuclear power control rod assembly of claim 1, wherein: and 5) drilling optimization, namely after the drilling empty position is determined, performing small-aperture pilot drilling, drilling to the threaded connection part of the guide nut, lifting the drill bit, then performing small-aperture drilling again, deepening the drill to the maximum drilling depth, and finally performing large-aperture reaming drilling to the maximum drilling depth.
7. The method of automatically drilling a hole in a nuclear power control rod assembly of claim 6, wherein: and 5, after the control rod is measured and the drilling position is determined, drilling of 1.9 mm in depth to the threaded connection position of the guide nut, lifting of the drill by 3mm, drilling of 1.9 mm in depth to 5 mm in depth, and finally reaming of 2 mm in depth to 5 mm in depth.
Priority Applications (1)
| 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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| 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 true CN113000880A (en) | 2021-06-22 |
| CN113000880B CN113000880B (en) | 2023-05-30 |
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Citations (10)
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|---|---|---|---|---|
| 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 |
| 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 |
-
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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| CN113000880B (en) | 2023-05-30 |
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