CN102513778A - Method for taking out bolt without damaging bolt hole - Google Patents
Method for taking out bolt without damaging bolt hole Download PDFInfo
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- CN102513778A CN102513778A CN201110375444XA CN201110375444A CN102513778A CN 102513778 A CN102513778 A CN 102513778A CN 201110375444X A CN201110375444X A CN 201110375444XA CN 201110375444 A CN201110375444 A CN 201110375444A CN 102513778 A CN102513778 A CN 102513778A
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- bolt
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- harmless
- shrinkage
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Abstract
The invention discloses a method for taking out a bolt without damaging a bolt hole, which comprises the following steps of (1) drilling a hole named a contraction hole on the end face of the bolt, and enabling the contraction hole to penetrate towards the direction of the other end face of the bolt; (2) cooling the bolt to enable the outer diameter of the bolt to contract; and (3) taking the bolt out. The method utilizes the expansion and contraction principle, firstly the contraction hole is processed on the bolt to provide a contraction space to reduce tightening force when the bolt is taken out, then the bolt is cooled down to enable the outer diameter of the bolt to contract and then change interference fit relation between the bolt and the bolt hole, and accordingly the bolt can be easily taken out. The method is ingenious in concept, easy to implement and capable of being widely applied to assembly and disassembly of the bolt for connection.
Description
Technical field
The present invention relates to the method for the taking-up bolt in a kind of machining production.
Background technology
Bolt Connection is a kind of extremely general connecting mode in the machinery production field.Bolt inserts in the concentric bolt hole of two workpiece, and the nut of screwing on has just been accomplished connection.As for the hole axle matching relationship between bolt and the bolt hole, just can depend on the actual production requirement and determine, the point of attachment of the non-frequent mounting or dismounting of some large-scale workpiece is just sometimes used the cooperation of interference.But, though still can there be the situation that need unload bolt in the over-surplus fit structure that right and wrong are are often installed and removed.Small-sized bolt can be extracted with simple tools by force, but, bolt higher when the technological requirement precision, bolt hole just occur bolt hole easily and draw situation bad, damage when being big model.For example in two connecting flanges of the stern tube shaft of large-scale ship and jackshaft, its bolt hole aperture is all bigger, and in a single day its corresponding bolt installs, and just is difficult to extract.Such a fitting-up bolt dismounting all adopts hydraulic way directly to pull out at present, causes bolt and bolt hole damage easily and directly pull out, and amount of damage is excessive, even can cause the whole piece axle to be scrapped.Therefore, need a kind ofly can when taking out bolt, can guarantee the taking-up bolt method that bolt hole can not damage.
Summary of the invention
The object of the invention is to provide a kind of method that when taking out bolt, can't harm bolt hole.
The solution that the present invention solves its technical problem is:
A kind ofly take out bolt and the method for harmless bolt hole, it may further comprise the steps:
1), on the end face of bolt, hole, this hole is called shrinkage hole, and shrinkage hole towards the other end direction of bolt deeply;
2), the cooling bolt, let the bolt external diameter shrink;
3), take out bolt.
As the further improvement of technique scheme, said shrinkage hole is positioned at the center of bolt.
As the further improvement of technique scheme, said step 2) the middle mode of cooling off bolt is to adopt the cooled with liquid nitrogen mode.
As the further improvement of technique scheme, said cooled with liquid nitrogen mode is meant that in the shrinkage hole perfusion liquid nitrogen lets the bolt cooling.
As the further improvement of technique scheme, the shrinkage hole in the said step 1) processes through the magnetic force brill.
As the further improvement of technique scheme, said step 2) and step 3) between, also have and wait for that bolt is cooled to the step that itself and bolt hole get loose fully.
The invention has the beneficial effects as follows: the principle that utilization of the present invention is expanded with heat and contract with cold; Earlier on bolt, process shrinkage hole and abdicate shrink space; Reduced the expanding force when taking out bolt, cooled off bolt then, let the external diameter of bolt shrink; Change the interference fit relation between bolt and the bolt hole, thereby can take out bolt like a cork.The present invention is skillfully constructed, and implements easily, can be widely used in the mounting or dismounting work of Bolt Connection.
Description of drawings
Below in conjunction with accompanying drawing and instance the present invention is further described.
Fig. 1 is the structural representation when application is of the present invention in the stern tube shaft of ship and jackshaft connecting flange;
Fig. 2 is the vertical view of Fig. 1.
The specific embodiment
With reference to Fig. 1～Fig. 2, suppose that the bolt that will take out now is the argosy bolt on the connecting flange in stern tube shaft 4 and jackshaft 5 draw bails of merely hitting, so, this takes out bolt and the method for harmless bolt hole, and it may further comprise the steps:
1), on the end face of bolt 1, hole, this hole is called shrinkage hole 2, and shrinkage hole 2 towards the other end direction of bolt 1 deeply;
2), cooling bolt 1, let bolt 1 external diameter shrink;
3), take out bolt 1.
Here, shrinkage hole 2 towards the other end of bolt 1 deeply, be meant boring direction can be roughly along bolt 1 axially, and shrinkage hole 2 is not that only to limit quantity be one.Boring the purpose of shrinkage hole 2, is in order to abdicate shrink space, to reduce expanding force.But more reasonable in order to let shrinkage stress distribute, it is good that shrinkage hole 2 should be positioned at the center, and therefore, further as preferred embodiment, said shrinkage hole 2 is positioned at the center of bolt 1, and its hole axle is concentric with the central shaft of bolt 1.
Further as preferred embodiment, said step 2) mode of cooling bolt 1 is to adopt the cooled with liquid nitrogen mode in.
Further as preferred embodiment, said cooled with liquid nitrogen mode is meant that the perfusion liquid nitrogen lets bolt 1 cool off in the shrinkage hole 2.Except directly in shrinkage hole 2, pouring into liquid nitrogen, the mode of cold conduction also capable of using is provided with low-temperature receiver and absorbs its heat at bolt 1 other position; Can let bolt 1 contraction of catching a cold equally; Certainly, because shrinkage hole 2 is positioned at the center of bolt 1, and to shrinkage hole 2 perfusion liquid nitrogen; Just can let bolt 1 integral body entad shrink, prevent and catch a cold inhomogeneous and structural deterioration that occur.
Further as preferred embodiment, the shrinkage hole 2 in the said step 1) bores 3 through magnetic force and processes.Because bolt 1 is to be positioned on the connecting flange, its side is not provided with the space of lathe, and hand-held brill can not guarantee preferably shrinkage hole 2 with one heart, to neutrality, therefore, adopting magnetic force to bore 3 borings is preferred implementation.Particularly, start the front and back that the generation suction fixedly secure the step on jackshaft 5, can also assist through self-control frock clamp equipment magnetic force brill 3 and location are installed at magnetic force brill 3.
Further as preferred embodiment, said step 2) and between the step 3), also has and wait for that bolt 1 is cooled to the step that itself and bolt hole get loose fully.Because it is a conduction process slowly that cooling is shunk, therefore, preferably wait for a period of time again having poured into after liquid nitrogen cooled off by bolt 1, let bolt 1 get loose with bolt hole fully after, just bolt is got in enforcement.Specifically get the method for bolt, can realize through the mode of drawing, pull out, beaing.
Extract defective bolt with needs, the scheme that replaces with qualified bolt is an example, and the present invention can implement like this:
1, storm lantern trace heating nut, temperature is controlled between 100 ℃～150 ℃, puts warm agent monitoring, treats to screw out after nut cools off and puts well;
2, the bolt that will extract 1 jiggering to directly over;
3, magnetic force bore 3 frock seats to bit code dead, the adjustment magnetic force bore 3 positions, centering bolt 1 center;
4, start magnetic force and bore 3, low-speed running slowly advances, and waters inject cooling liquid simultaneously, bores the about 250mm of shrinkage hole 2 hole depths;
5, wait to have bored the hole after, a sprue gate is stayed in nose end sealing, gets into sprue gate, freezing about 5～10 minutes towards liquid nitrogen;
6, pound out bolt 1 with copper rod, to guarantee that bolt 1 appearance and bolt hole inner surface are not pulled;
7, inspection bolt hole inner surface and bolt 1 outer surface, cleaning, measurement circularity and cylindricity;
8, its magnitude of interference is detected in bolt processing back, with its hole contrast, requires to satisfy Design Requirement Drawing;
9, qualified bolt is put into freezing bucket, tapping nitrogen cooled off about 30 minutes;
10, treat that qualified bolt is cooled after, take out, tap down in the corresponding bolt hole, treat that bolt recovers normal temperature after, coat screw threads for fastening glue, the hydraulic spanner tension depends on technological requirement to get suitable moment.
More than be that preferred embodiments of the present invention is specified; But the invention is not limited to said embodiment; Those of ordinary skill in the art also can make all equivalent modifications or replacement under the prerequisite of spirit of the present invention, modification that these are equal to or replacement all are included in the application's claim institute restricted portion.
Claims (6)
1. one kind is taken out bolt and the method for harmless bolt hole, and it is characterized in that: it may further comprise the steps:
1), on the end face of bolt, hole, this hole is called shrinkage hole, and shrinkage hole towards the other end direction of bolt deeply;
2), the cooling bolt, let the bolt external diameter shrink;
3), take out bolt.
2. taking-up bolt according to claim 1 and the method for harmless bolt hole, it is characterized in that: said shrinkage hole is positioned at the center of bolt.
3. taking-up the bolt according to claim 1 and method of harmless bolt hole is characterized in that: the mode of cooling bolt said step 2) is to adopt the cooled with liquid nitrogen mode.
4. taking-up the bolt according to claim 3 and method of harmless bolt hole is characterized in that: said cooled with liquid nitrogen mode is meant that the perfusion liquid nitrogen lets bolt cool off in the shrinkage hole.
5. taking-up the bolt according to claim 1 and method of harmless bolt hole is characterized in that: the shrinkage hole in the said step 1), bore through magnetic force and to process.
6. taking-up the bolt according to claim 1 and method of harmless bolt hole is characterized in that: said step 2) and between the step 3), also have and wait for that bolt is cooled to the step that itself and bolt hole get loose fully.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110375444XA CN102513778A (en) | 2011-11-23 | 2011-11-23 | Method for taking out bolt without damaging bolt hole |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110375444XA CN102513778A (en) | 2011-11-23 | 2011-11-23 | Method for taking out bolt without damaging bolt hole |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102513778A true CN102513778A (en) | 2012-06-27 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201110375444XA Pending CN102513778A (en) | 2011-11-23 | 2011-11-23 | Method for taking out bolt without damaging bolt hole |
Country Status (1)
| Country | Link |
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| CN (1) | CN102513778A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102825421A (en) * | 2012-09-11 | 2012-12-19 | 佛山市顺德区金泰德胜电机有限公司 | Shaft removing method for taking out rotating shaft from cast-aluminum rotor |
| CN104368954A (en) * | 2014-10-31 | 2015-02-25 | 沈阳黎明航空发动机(集团)有限责任公司 | Disassembly method for nickel-base high-temperature alloy ring parts after interference assembly |
| CN104440766A (en) * | 2014-11-18 | 2015-03-25 | 中船黄埔文冲船舶有限公司 | Disassembling tool and method for interference bolt |
| CN106738497A (en) * | 2017-03-14 | 2017-05-31 | 青岛金科模具有限公司 | Pattern block and tire-mold |
| CN108188702A (en) * | 2017-12-29 | 2018-06-22 | 江苏百崮钢结构工程有限公司 | A kind of gate bottom flatcar disassembling system and its technique |
| CN109159065A (en) * | 2018-09-30 | 2019-01-08 | 尹苑苑 | A kind of quick method for dismounting of corrosion bolt |
| CN112025614A (en) * | 2020-07-30 | 2020-12-04 | 江苏永昊高强度螺栓有限公司 | Bolt suitable for capital construction engineering and disassembling method of bolt |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3345732A (en) * | 1964-06-11 | 1967-10-10 | Gen Dynamics Corp | Method of shrink fitting and apparatus therefor |
| JPS57194833A (en) * | 1981-05-25 | 1982-11-30 | Hitachi Zosen Corp | Extracting method for reamer bolt, etc. |
| JPS6420940A (en) * | 1987-07-15 | 1989-01-24 | Hitachi Ltd | Reamer bolt extracting device |
| US5022136A (en) * | 1988-08-10 | 1991-06-11 | Gec Alsthom Sa | Method and a device for removing an elongate shrink-fitted core made of a tough material from a hole |
| CN201552315U (en) * | 2009-11-24 | 2010-08-18 | 安徽淮化股份有限公司 | Special tool for dismounting large bolt on-site |
-
2011
- 2011-11-23 CN CN201110375444XA patent/CN102513778A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3345732A (en) * | 1964-06-11 | 1967-10-10 | Gen Dynamics Corp | Method of shrink fitting and apparatus therefor |
| JPS57194833A (en) * | 1981-05-25 | 1982-11-30 | Hitachi Zosen Corp | Extracting method for reamer bolt, etc. |
| JPS6420940A (en) * | 1987-07-15 | 1989-01-24 | Hitachi Ltd | Reamer bolt extracting device |
| US5022136A (en) * | 1988-08-10 | 1991-06-11 | Gec Alsthom Sa | Method and a device for removing an elongate shrink-fitted core made of a tough material from a hole |
| CN201552315U (en) * | 2009-11-24 | 2010-08-18 | 安徽淮化股份有限公司 | Special tool for dismounting large bolt on-site |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102825421A (en) * | 2012-09-11 | 2012-12-19 | 佛山市顺德区金泰德胜电机有限公司 | Shaft removing method for taking out rotating shaft from cast-aluminum rotor |
| CN104368954A (en) * | 2014-10-31 | 2015-02-25 | 沈阳黎明航空发动机(集团)有限责任公司 | Disassembly method for nickel-base high-temperature alloy ring parts after interference assembly |
| CN104440766A (en) * | 2014-11-18 | 2015-03-25 | 中船黄埔文冲船舶有限公司 | Disassembling tool and method for interference bolt |
| CN106738497A (en) * | 2017-03-14 | 2017-05-31 | 青岛金科模具有限公司 | Pattern block and tire-mold |
| CN108188702A (en) * | 2017-12-29 | 2018-06-22 | 江苏百崮钢结构工程有限公司 | A kind of gate bottom flatcar disassembling system and its technique |
| CN109159065A (en) * | 2018-09-30 | 2019-01-08 | 尹苑苑 | A kind of quick method for dismounting of corrosion bolt |
| CN109159065B (en) * | 2018-09-30 | 2020-10-30 | 瑞安市威孚标准件有限公司 | Method for quickly disassembling rusted bolt |
| CN112025614A (en) * | 2020-07-30 | 2020-12-04 | 江苏永昊高强度螺栓有限公司 | Bolt suitable for capital construction engineering and disassembling method of bolt |
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Application publication date: 20120627 |