CN1325224C - Method for hole boring fine processing of ship stern shaft tube - Google Patents
Method for hole boring fine processing of ship stern shaft tube Download PDFInfo
- Publication number
- CN1325224C CN1325224C CNB2004100527853A CN200410052785A CN1325224C CN 1325224 C CN1325224 C CN 1325224C CN B2004100527853 A CNB2004100527853 A CN B2004100527853A CN 200410052785 A CN200410052785 A CN 200410052785A CN 1325224 C CN1325224 C CN 1325224C
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- shaft pipe
- stern
- tube shaft
- hole
- stern tube
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Abstract
The present invention relates to a fine processing method for a boring hole of a ship stern shaft tube, which takes the following measures that (1) a wind abrasive wheel which rotates along with a stern shaft tube processing boring platoon and axially operates along with a cutter frame of the stern shaft tube processing boring platoon is arranged on the stern shaft tube processing boring platoon; (2) the compressed air can be delivered to the wind abrasive wheel by a dynamic and static connector which is arranged on the stern shaft tube processing boring platoon and is transmitted pneumatically, and the boring hole of a stern shaft tube is ground and processed by the wind abrasive wheel. The present invention enhances the safety, the environmental protection performance and the good health performance of a stern shaft tube fine processing process, and the labor strength of workmen is relieved; meanwhile, the present invention can forcefully guarantee the quality of the boring hole of the stern shaft tube, and a whole operating period of the boring hole of the stern shaft tube is shortened.
Description
Technical field
The present invention and shipbuilding processing is relevant, the particularly a kind of marine stern axle tube that can control marine stern axle tube machining dimension and surface roughness effectively method for finishing manufactured of boring a hole.
Background technology
The processing of marine stern axle tube at present is to utilize lathe tool to be installed in the row of warding off the stern tube shaft pipe is processed, and removes the row of warding off again from the stern tube shaft pipe subsequently, takes turns the artificial grinding stern tube shaft pipe inwall of boring a hole by the hand-held windmill of workman and carries out fine finishining.Adopt this method for fine finishing, though final crudy can obtain control to a certain degree, mechanization degree is too low, the raising of restriction crudy; In whole stern tube shaft pipe fine finishining process, the difficulty of concentricity, surface smoothness, circularity and the cylindricity of short time inner control stern tube shaft pipe is very big, and this makes corresponding prolongation of process-cycle; And the fine finishining of stern tube shaft pipe is to be drilled in the narrow stern tube shaft pipe by the workman, and hand-held windmill is taken turns artificial grinding, the workman has to suffer the metal of grinding to splash and the infringement of dust, and not only labour intensity is big especially, poor working environment, safety guarantee is poor, and grinding quality can not get powerful guarantee.
Summary of the invention
The objective of the invention is to overcome above-mentioned the deficiencies in the prior art, a kind of marine stern axle tube method for fine finishing of boring a hole is provided, to improve security, the feature of environmental protection and the health of stern tube shaft pipe fine finishining process, alleviate working strength of workers, the quality of simultaneously again can sound assurance stern tube shaft pipe boring a hole shortens the work period that whole stern tube shaft pipe is bored a hole.
For achieving the above object, the invention provides a kind of marine stern axle tube method for finishing manufactured of boring a hole, be characterized in taking following measures:
1.. the windmill wheel that rotates and ward off with shaft tube processing the axial operation of gang feed tool rack with the stern tube shaft pipe processing row of warding off is installed in the stern tube shaft pipe processing row of warding off;
2.. make the sound connector of compressed air through being installed on the gas transmission in the stern tube shaft pipe processing row of warding off be sent to the windmill wheel, this windmill wheel is bored a hole to the stern tube shaft pipe and is carried out grinding.
The described marine stern axle tube method for finishing manufactured of boring a hole comprises the following steps:
1.. take turns fixedly windmill wheel of stationary fixture with windmill;
2.. windmill is taken turns stationary fixture be fixed in stern tube shaft pipe processing and ward off on the gang feed tool rack, make windmill take turns the parallel stern tube shaft pipe processing row of warding off;
3.. the sound connector of gas transmission is fixed in the stern tube shaft pipe processing row of warding off;
4.. connect the moving chamber joint of sound connector of gas transmission and the airduct input adapter of windmill wheel with the air inlet airduct, connect the quiet chamber joint of the sound connector that ground source of the gas and gas transmits with a compressed air gas source air inlet airduct;
5.. start the stern tube shaft pipe processing row of warding off CD-ROM drive motor and also open ground gas source switch valve, the windmill wheel rotates with the stern tube shaft pipe processing row of warding off and wards off gang feed tool rack with shaft tube processing and axially move the stern tube shaft pipe bored a hole and carry out grinding.
1. the bore a hole step of method for finishing manufactured of described marine stern axle tube comprises the following steps:
A. the fixedly clamp with windmill wheel stationary fixture clamps the windmill wheel;
B. a set bolt being passed on the fixing clamp screw perpendicular to its set clamp bottom outlet in bottom will pass one of clamp bottom outlet and connect double-screw bolt and link to each other with fixing clamp;
C. will connect double-screw bolt is fixed in a connection piece.
Described marine stern axle tube bore a hole method for finishing manufactured step 2. in: utilize the connector set bolt that connector is fixed on stern tube shaft pipe processing and ward off in the connector groove of gang feed tool rack, be fixed in stern tube shaft pipe processing and ward off on the gang feed tool rack windmill is taken turns stationary fixture, by regulating the height and position of the position adjustments windmill wheel of this connector in the connector groove.
The sound connector of described gas transmission is to plug the sound connector that constitutes the internal chamber wall sealing by its quiet chamber joint and moving chamber joint, and described moving chamber joint is fixed in the stern tube shaft pipe processing row of warding off, and the relative ground of joint, quiet chamber is fixed.
One end of described moving chamber joint is a ring flange, and the other end is the inner chamber with opening, and this inner chamber outwards is provided with the gas transmission interface; Its quiet chamber joint one end also has the inner chamber of opening, the outer wall of this inner chamber is provided with multiple tracks round section joint ring groove, in this round section joint ring groove round section joint ring is set, the other end has the tracheae coupling that communicates with its inner chamber, and the end that this quiet chamber joint has inner chamber inserts the inner chamber that moves the chamber joint.
Described moving chamber joint is fixed by bolts to the end of the stern tube shaft pipe processing row of warding off; Quiet chamber joint is fixed with the relative ground of plate with bayonet socket.
The height and position of described windmill wheel can be warded off the bore a hole radial distance of inwall of gang feed tool rack to stern tube shaft pipe according to the processing of stern tube shaft pipe and regulate.
Described windmill wheel can be installed coarse plain emery wheel, fine grinding wheel and buffing wheel, and the grinding of boring a hole comprises the following steps: to the stern tube shaft pipe
1. use coarse plain emery wheel to roughly grind, the stern tube shaft pipe inwall of boring a hole is polished substantially;
2. use fine grinding wheel to carry out fine grinding, finishing stern tube shaft pipe bore a hole stern tube shaft pipe concentricity, circularity and the cylindricity of inwall;
3. use buffing wheel to polish, the bore a hole surface roughness of inwall of control stern tube shaft pipe.
Technique effect of the present invention:
1, improves the mechanization degree of processing, fundamentally solved the difficulty that prior art restriction crudy improves;
2, the present invention is mounted in shaft tube processing with windmill wheel and wards off on the gang feed tool rack, and the shaft tube processing row of warding off center has been adjusted on the center line of shafting from the beginning, need not secondary adjustment again, the quality accident of stern tube shaft pipe off-centre also takes place with regard to having avoided the secondary adjustment center of gravity line deviation to occur, but also improved concentricity, circularity and the cylindricity of stern tube shaft pipe greatly, shortened the work period that whole stern tube shaft pipe is bored a hole;
3, the present invention adopts grinding to carry out fine finishining, has ensured the quality that the stern tube shaft pipe is bored a hole, and makes the surface roughness of stern tube shaft pipe processing circle obtain strong control: generally can reach surface roughness below 3.2, can be controlled at surface roughness about 0.8 sometimes;
4, adopt the present invention to carry out marine stern axle tube fine finishining, the workman need only install windmill wheel, starts the row of warding off, the connection source of the gas can be taken turns automatic grinding by windmill and be finished whole stern tube shaft pipe fine finishining process, not only guaranteed crudy, and improved workman's working environment, avoid the workman to suffer the infringement of grinding, alleviated working strength of workers greatly; Simultaneously, be the compressed air of ground supply because the present invention utilizes in stern tube shaft pipe fine finishining process, pressure has only 4Bar, and force value is comparatively safe; The threat that does not also have electric power that human body is caused, as safe as a house reliable.
The present invention is further illustrated below in conjunction with accompanying drawing and embodiment.
Description of drawings
Fig. 1 is the marine stern axle tube of the present invention precise machining device scheme of installation of boring a hole.
Fig. 2 is the bore a hole structural representation of moving chamber joint of sound connector of precise machining device gas transmission of marine stern axle tube of the present invention.
Fig. 3 is the bore a hole structural representation of quiet chamber joint of sound connector of precise machining device gas transmission of marine stern axle tube of the present invention.
Fig. 4 is the bore a hole structural representation of fixedly clamp of precise machining device windmill wheel stationary fixture of marine stern axle tube of the present invention.
Fig. 5 is the bore a hole structural representation of connection double-screw bolt of precise machining device windmill wheel stationary fixture of marine stern axle tube of the present invention.
Fig. 6 is the bore a hole structural representation of connector of precise machining device windmill wheel stationary fixture of marine stern axle tube of the present invention.
Fig. 7 is installed on structural representation in the stern tube shaft pipe for the marine stern axle tube of the present invention precise machining device of boring a hole.
Among the figure:
The sound connector 11 of 1-gas transmission-moving chamber joint
The inner chamber of 111-ring flange 112-moving chamber joint
113-gas transmission interface 12-quiet chamber joint
The inner chamber of 121-tracheae coupling 122-quiet chamber joint
123-round section joint ring groove, 124-round section joint ring
2-windmill wheel, 21-emery wheel
22-windmill wheel shaft, 23-airduct input adapter
The clamp of 3-windmill wheel stationary fixture 31-fixedly
311-clamp bottom outlet, 312-screw
313-through hole 32-connection double-screw bolt
33-set bolt, 34-connector
Gang feed tool rack is warded off in the processing of 4-air inlet airduct, 5-stern tube shaft pipe
51-connector groove, 52-connector set bolt
6-stern tube shaft pipe processing the row of the warding off 61-processing row of warding off CD-ROM drive motor
Processing circle behind processing circle 8-stern tube shaft pipe before 7-stern tube shaft pipe
9-compressed air gas source air inlet airduct
The specific embodiment
The marine stern axle tube of the present invention method for finishing manufactured of boring a hole is installed the stern tube shaft pipe precise machining device of boring a hole in the stern tube shaft pipe processing row of warding off, utilize the bore a hole windmill wheel of precise machining device of stern tube shaft pipe that stern tube shaft pipe processing circle inwall is carried out grinding.
As shown in Figure 1, the marine stern axle tube of the present invention precise machining device of boring a hole comprises sound connector 1, windmill wheel 2, one windmill wheel stationary fixture 3 and an air inlet airduct 4 of gas transmission.
The sound connector 1 of gas transmission comprises moving chamber joint 11 and quiet chamber joint 12, respectively shown in Fig. 2,3.One end of wherein moving chamber joint 11 is a ring flange 111, and the other end is the inner chamber 112 with opening, and this inner chamber 112 outwards is provided with gas transmission interface 113.Quiet chamber joint 12 1 ends also have the inner chamber 122 of opening, and the outer wall of this inner chamber 122 is provided with three road round section joint ring grooves 123, in this round section joint ring groove 123 round section joint ring 124 can be set, and the other end has the tracheae coupling 121 that communicates with its inner chamber.The end that this quiet chamber joint 12 has inner chamber 122 can insert in the inner chamber 112 of moving chamber joint 11, when quiet chamber joint 12 and moving chamber joint 11 relatively rotate, utilizes round section joint ring 124 to play sealing function.This quiet chamber joint 12 can be fixed by the relative ground of iron plate (figure does not show) with the bayonet socket that matches with the outside diameter of quiet chamber joint 12.
Windmill wheel stationary fixture 3 comprises fixedly clamp 31, connection double-screw bolt 32, set bolt 33 and connector 34.Wherein fixedly clamp 31 as shown in Figure 4, its size match with windmill wheel shaft 22.Fixedly the bottom of clamp 31 is provided with clamp bottom outlet 311, and this clamp bottom outlet 311 is communicated with the through hole 313 of fixedly clamp 31 formation.Fixedly establish a screw 312 perpendicular to this clamp bottom outlet 311 on the clamp 31, connect double-screw bolt 32 (shown in Figure 5) pass clamp bottom outlet 311 utilize set bolt 33 to pass screw 312 and with this fixedly clamp 31 link to each other.Connector 34 (shown in Figure 6) be connected double-screw bolt 32 and link to each other, its appearance and size is identical with the row of warding off process tool appearance and size.
This marine stern axle tube precise machining device of boring a hole can be transferred to ground compressed air on the windmill wheel 2 with 6 rotations of the stern tube shaft pipe processing row of warding off by its sound connector 1, and the emery wheel 21 of windmill wheel 2 is worked.
After the roughing of stern tube shaft pipe is finished, the machined cornish bit is warded off gang feed tool rack 5 from the processing of stern tube shaft pipe remove, utilize the inventive method that marine stern axle tube is bored a hole and carry out fine finishining.Consult shown in Fig. 1,7, the marine stern axle tube of the present invention method for finishing manufactured of boring a hole comprises the following steps:
1, with fixing clamp 31 windmill wheel 2 is clamped, and with set bolt 33 fixedly clamp 31 fit together with being connected double-screw bolt 32, will connect double-screw bolt 32 again and be screwed in the connector 34, thus with windmill take turns 2 and windmill take turns stationary fixture 3 and fit together;
2, with the fixing method of the row's of warding off process tool of set bolt, utilizing connector set bolt 52 that connector 34 is fixed on the processing of stern tube shaft pipe wards off in the connector groove 51 of gang feed tool rack 5, be fixed on the stern tube shaft pipe and process and ward off on the gang feed tool rack 5 windmill is taken turns the 2 parallel stern tube shaft pipes processing row of warding off 6, because connector groove 51 is darker, connector 34 can be in groove up-down adjustment, therefore according to the stern tube shaft pipe processing ward off gang feed tool rack 5 to the stern tube shaft pipe behind processing circle 7 and the stern tube shaft pipe radial distance of processing circle 8 inwalls regulate the height and position of windmill wheel 2;
3, marine stern axle tube the is bored a hole moving chamber joint 11 of sound connector 1 of precise machining device gas transmission is fixed by bolts to the end of the stern tube shaft pipe processing row of warding off 6, quiet chamber joint 12 is installed on the moving chamber joint 11h, its end with inner chamber 122 inserts in the inner chamber 112 of moving chamber joint 11, with the iron plate with bayonet socket joint 12 relative ground in quiet chamber is fixed again;
4, connect the gas transmission interface 113 of moving chamber joint 11 and the airduct input adapter 23 of windmill wheel 2 with air inlet airduct 4, connect the tracheae coupling 121 of ground source of the gas and quiet chamber joint 12 with a compressed air gas source air inlet airduct 9;
5, starting the stern tube shaft pipe processes the row's of warding off CD-ROM drive motor 61 and opens ground gas source switch valve: start CD-ROM drive motor 61,6 rotations of the shaft tube processing row of warding off, shaft tube processing is warded off gang feed tool rack 5 and is carried the screw mandrel group by the stern tube shaft pipe processing row of warding off 6 and drive and do axially-movable, so windmill wheel 2 rotates with the stern tube shaft pipe processing row of warding off 6 and process with shaft tube and to ward off gang feed tool rack 5 and axially move; Open ground gas source switch valve, the quiet chamber joint 12 of the sound connector 1 of the compressed successively air source of the gas of compressed air air inlet airduct 9, gas transmission, moving chamber joint 11, air inlet airduct 4 are sent to windmill wheel 2, make emery wheel 21 work of windmill wheel 2, the inwall of processing circle 8 behind processing circle 7 and the stern tube shaft pipe before the whole stern tube shaft pipe is carried out grinding.
The present invention has improved marine stern axle tube bore a hole security, the feature of environmental protection and the health of accurately machined mechanization degree and process, the quality of simultaneously again can sound assurance stern tube shaft pipe boring a hole, alleviate working strength of workers greatly, also shortened the work period that whole stern tube shaft pipe is bored a hole.
Claims (9)
1, a kind of marine stern axle tube method for finishing manufactured of boring a hole is characterized in that taking following measures:
1.. go up installation in the stern tube shaft pipe processing row of warding off (6) and ward off the windmill wheel (2) that gang feed tool rack (5) axially moves with the stern tube shaft pipe processing row of warding off (6) rotation and with the processing of stern tube shaft pipe;
2.. make the sound connector (1) of compressed air through being installed on the gas transmission in the stern tube shaft pipe processing row of warding off (6) be sent to windmill wheel (2), this windmill wheel (2) is bored a hole to the stern tube shaft pipe and is carried out grinding.
2, the marine stern axle tube according to claim 1 method for finishing manufactured of boring a hole is characterized in that comprising the following steps:
1.. take turns fixedly windmill wheel (2) of stationary fixture (3) with windmill;
2.. windmill is taken turns stationary fixture (3) be fixed in stern tube shaft pipe processing and ward off on the gang feed tool rack (5), make the parallel stern tube shaft pipe processing of windmill wheel (2) row of warding off (6);
3.. the sound connector (1) of gas transmission is fixed in the stern tube shaft pipe processing row of warding off (6);
4.. connect the moving chamber joint (11) of sound connector (1) of gas transmission and the airduct input adapter (23) of windmill wheel (2) with air inlet airduct (4), the quiet chamber joint (12) of the sound connector (1) that transmits with a compressed air gas source air inlet airduct (9) connection ground source of the gas and gas;
5.. start the stern tube shaft pipe processing row of warding off CD-ROM drive motor (61) and also open ground gas source switch valve, windmill wheel (2) with the stern tube shaft pipe processing row of warding off (6) rotation and with shaft tube processing ward off gang feed tool rack (5) axial move the stern tube shaft pipe bored a hole carry out grinding.
3, the marine stern axle tube according to claim 2 method for finishing manufactured of boring a hole is characterized in that 1. described step comprises the following steps:
A. take turns the fixedly clamp of stationary fixture (3) with windmill wheel (2) clamping with windmill;
B. a set bolt (33) being passed fixing clamp (31) goes up screw (312) perpendicular to its set clamp bottom outlet in bottom (311) and will pass one of clamp bottom outlet (311) and connect double-screw bolt (32) and link to each other with fixing clamp (31);
C. will connect double-screw bolt (32) is fixed in a connection piece (34).
4, the marine stern axle tube according to claim 3 method for finishing manufactured of boring a hole, in it is characterized in that step 2.: utilize connector set bolt (52) that connector (34) is fixed on the processing of stern tube shaft pipe and ward off in the connector groove (51) of gang feed tool rack (5), be fixed in stern tube shaft pipe processing and ward off on the gang feed tool rack (5) windmill is taken turns stationary fixture (3), by regulating the height and position of the position adjustments windmill wheel (2) of this connector (34) in connector groove (51).
5, the marine stern axle tube according to claim 1 and 2 method for finishing manufactured of boring a hole, the sound connector (1) that it is characterized in that described gas transmission is to plug the sound connector (1) that constitutes the internal chamber wall sealing by its quiet chamber joint (12) and moving chamber joint (11), described moving chamber joint (11) is fixed in the stern tube shaft pipe processing row of warding off (6), and quiet chamber joint (12) is fixed on ground relatively.
6, the marine stern axle tube according to claim 5 method for finishing manufactured of boring a hole, an end that it is characterized in that described moving chamber joint (11) is ring flange (111), the other end is the inner chamber (112) with opening, and this inner chamber (112) outwards is provided with gas transmission interface (113); Its quiet chamber joint (12) one ends also have the inner chamber (122) of opening, the outer wall of this inner chamber (122) is provided with multiple tracks round section joint ring groove (123), in this round section joint ring groove (123) round section joint ring (124) is set, the other end has the tracheae coupling (121) that communicates with its inner chamber, and the end that this quiet chamber joint (12) has inner chamber (122) inserts the inner chamber (112) that moves chamber joint (11).
7, the marine stern axle tube according to claim 5 method for finishing manufactured of boring a hole is characterized in that described moving chamber joint (11) is fixed by bolts to the end of the stern tube shaft pipe processing row of warding off (6); Quiet chamber joint (12) is fixed with the relative ground of plate with bayonet socket.
8, the marine stern axle tube according to claim 1 and 2 method for finishing manufactured of boring a hole, the height and position that it is characterized in that windmill wheel (2) can be warded off the bore a hole radial distance of inwall of gang feed tool rack (5) to stern tube shaft pipe according to the processing of stern tube shaft pipe and regulate.
9, the marine stern axle tube according to claim 1 and 2 method for finishing manufactured of boring a hole is characterized in that windmill wheel (2) can install coarse plain emery wheel, fine grinding wheel and buffing wheel, and the grinding of boring a hole comprises the following steps: to the stern tube shaft pipe
1. use coarse plain emery wheel to roughly grind, the stern tube shaft pipe inwall of boring a hole is polished substantially;
2. use fine grinding wheel to carry out fine grinding, finishing stern tube shaft pipe bore a hole stern tube shaft pipe concentricity, circularity and the cylindricity of inwall;
3. use buffing wheel to polish, the bore a hole surface roughness of inwall of control stern tube shaft pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100527853A CN1325224C (en) | 2004-07-13 | 2004-07-13 | Method for hole boring fine processing of ship stern shaft tube |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100527853A CN1325224C (en) | 2004-07-13 | 2004-07-13 | Method for hole boring fine processing of ship stern shaft tube |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1586812A CN1586812A (en) | 2005-03-02 |
| CN1325224C true CN1325224C (en) | 2007-07-11 |
Family
ID=34602603
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2004100527853A Expired - Fee Related CN1325224C (en) | 2004-07-13 | 2004-07-13 | Method for hole boring fine processing of ship stern shaft tube |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1325224C (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100358674C (en) * | 2005-12-01 | 2008-01-02 | 渤海船舶重工有限责任公司 | Marine stern axle tube boring technological equipment erecting process |
| CN105965209B (en) * | 2016-06-17 | 2018-02-13 | 南通德玛瑞机械制造有限公司 | A kind of long anti-processing thermal deformation cutting process of marine screw shaft processing of 22m |
| CN106392860A (en) * | 2016-12-08 | 2017-02-15 | 安庆中船柴油机有限公司 | Ultra-long deep hole polishing tool for machining deep hole parts of diesel engine |
| CN107443214B (en) * | 2017-08-02 | 2019-04-05 | 浙江广源印刷包装有限公司 | A kind of waste paper pipe surface automation polishing recycling equipment |
| CN113427327B (en) * | 2021-07-13 | 2022-05-20 | 大连理工大学 | Method and device for processing edge of intersecting hole of long pipe part with large depth-diameter ratio |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06126515A (en) * | 1992-10-13 | 1994-05-10 | Ishikawajima Harima Heavy Ind Co Ltd | Decentering correction method for boring bar |
| JP2001179513A (en) * | 1999-12-28 | 2001-07-03 | Mitsubishi Heavy Ind Ltd | Boring device |
-
2004
- 2004-07-13 CN CNB2004100527853A patent/CN1325224C/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06126515A (en) * | 1992-10-13 | 1994-05-10 | Ishikawajima Harima Heavy Ind Co Ltd | Decentering correction method for boring bar |
| JP2001179513A (en) * | 1999-12-28 | 2001-07-03 | Mitsubishi Heavy Ind Ltd | Boring device |
Non-Patent Citations (1)
| Title |
|---|
| 船舶为艉轴艉管镗孔装置的改进设计 张潮宏，广东造船，第1期 2001 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1586812A (en) | 2005-03-02 |
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