CN105798542A - Machining method for plug in heat transfer pipe of heat exchanger - Google Patents
Machining method for plug in heat transfer pipe of heat exchanger Download PDFInfo
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- CN105798542A CN105798542A CN201410848524.6A CN201410848524A CN105798542A CN 105798542 A CN105798542 A CN 105798542A CN 201410848524 A CN201410848524 A CN 201410848524A CN 105798542 A CN105798542 A CN 105798542A
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- sleeve
- plug
- sleeve blank
- slide block
- cone
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Abstract
The invention provides a machining method for a plug in a heat transfer pipe of a heat exchanger. The machining method comprises the main machining steps that the size of the plug is measured; a sleeve workblank and a cone core sliding block are manufactured; the cone core sliding block is matched with the sleeve workblank; the sleeve workblank well provided with the cone core sliding block is pressed in a die with a mold cavity, the sleeve workblank deforms because of the extrusion action so as to be attached to the cone core sliding block; and finally, the sleeve workblank is taken out of the mold cavity of the die, and a blind hole, the outer wall and the end of the sleeve workblank are machined, and then the finished plug is obtained. According to the machining method, the manufacturing steps are few, a sleeve is matched with the cone core sliding block mainly through one die, mechanical devices related to the machining method are few, and very high precision calculation is not needed; and in addition, the machining method can adapt to manufacturing and machining of plugs with various diameters, and applicability is high.
Description
Technical field
The present invention relates to the processing method of plug in a kind of heat transfering tube of heat exchanger.
Background technology
In nuclear power station, heat exchanger is requisite equipment, and heat exchanger includes the parts such as shell, heat-transfer pipe, and described heat-transfer pipe is because the factors such as current scour can cause breaking.Generally find that it can be carried out plugging maintenance work by defective heat-transfer pipe.Plugging refers to inserts plug respectively at defective heat-transfer pipe two ends, thus being effectively isolated from outside primary Ioops medium by breakage heat-transfer pipe.The plugging method of current countries in the world mainly has blast plugging, welding plugging and machinery plugging.Heat-transfer pipe through blast plugging and welding plugging is difficult to come into operation again, belongs to permanent plugging.Machinery plugging belongs to drawing type plugging, and plug easily takes out, and can heat-transfer pipe be checked again in a non-operative state.Along with the progress of technology, if the heat-transfer pipe defect of closure can be repaired, then can reusing under the premise using safety, this provides cost savings undoubtedly, and therefore machinery plugging is widely adopted.
The domestic plug for machinery plugging is abroad detected company monopolizing's supply at present, and its price is extremely expensive, adds the cost of domestic nuclear power maintenance.The common version of plug of machinery plugging is as shown in Figure 6, plug 1 includes sleeve 11 and is arranged in the cone core slide block 12 of sleeve 11, sleeve 12 one end open one end is closed, the hole of its formation is tapered, sleeve 11 outer wall has the annular groove 113 that a series of degree of depth does not wait, form tooth form tooth, tooth form tooth is for being formed multi-sealed with the laminating of the inwall of heat-transfer pipe, its operation principle is: by installation equipment, plug is inserted heat-transfer pipe, cone core slide block is pulled out, because cone core slide block and sleeve are by cone match, so when boring core slide block and pulling out, the external diameter of sleeve can increase because of the squeezing action of cone core slide block, and then make plug be supported on the inwall of heat-transfer pipe.At present, the processing method producing this plug has two kinds: one is that its sleeve is processed as leading portion and back segment two parts, again with back segment carries out butt welding after loading cone core slide block in leading portion.This method of manufacturing technology is simple, but owing to sleeve exists weld seam, easily tears from commissure in installation process, and also easily from commissure corrosion failure in use procedure, leverages result of use and the life-span of plug.The processing method of another kind of plug is to process sleeve blank and cone core slide block respectively, sleeve blank is offered cylinder blind hole, make the inwall of sleeve blank match with cone core slide block by spinning process again after cone core slide block installs to the cylinder blind hole of sleeve blank, finally the further machining of sleeve blank is obtained finished product plug.The plant equipment that this method requires is more, and difficulty of processing coefficient is big.More than comprehensive, the method processing plug in prior art has weak point, so needing the more rational processing method of one to produce plug.
Summary of the invention
The technical problem to be solved in the present invention is in that to provide the processing method of plug in a kind of easy to operate, simple heat transfering tube of heat exchanger of technique, to overcome the drawbacks described above of prior art.
In order to solve above-mentioned technical problem, the present invention adopts the following technical scheme that the processing method of plug in a kind of heat transfering tube of heat exchanger, described plug includes sleeve and cone core slide block, and described cone core slide block is in the blind hole that sleeve is axial, and the processing method of described plug comprises the following steps:
One, the size of plug is calculated according to heat-transfer pipe specification；
Two, bar is selected to make sleeve blank, bar is carried out solution treatment, so as to obtain single phase austenite grain structure, then bar is processed into the truncated cone shape including large end face and small end face, blind hole is processed along axis from frustum of a cone large end face side, one mould of dimensioned according to sleeve blank simultaneously, described mould has the small end face diameter of a columned die cavity, the internal diameter of described die cavity and sleeve blank and adapts；
Three, titanium alloy or stainless steel bar base is selected to make cone core slide block, rod base adopt the mode that solution treatment and Ageing Treatment combine carry out preliminary treatment or adopt the mode that quenching and tempering combine to carry out preliminary treatment, rod base is processed into the truncated cone shape including large end face and small end face, offering tapped through hole along frustum of a cone axis, the blind hole diameter on described sleeve blank is not less than cone core slide block large end face diameter；
Four, cone core slide block large end face is loaded inwardly in the blind hole of sleeve blank；
Five, the sleeve blank small end face side installing cone core slide block is put in the mold cavity processed inwardly, sleeve blank is made to fully enter die cavity from small end face side to large end face side by pressurized equipment, sleeve blank is because squeezing action becomes cylindrical from truncated cone, and the inwall of sleeve blank fits with cone pellet；
Six, sleeve blank is taken out from the die cavity of mould, the blind hole of sleeve blank, outer wall and end are carried out machining and obtains finished product plug.
Preferably, the volume of described sleeve blank is at least 1.3 times of finished product plug volume.
Preferably, the outer surface gradient of described step 2 middle sleeve blank is 3 °.
Preferably, the outer surface gradient boring core slide block in described step 3 is 3 °.
Preferably, the hardness of described cone core slide block is more than the hardness of sleeve.
Preferably, the material of described sleeve and the material of heat-transfer pipe are identical.
As it has been described above, the processing method of plug in a kind of heat transfering tube of heat exchanger of the present invention, have the advantages that
The manufacturing process of heat-transfer pipe plug manufacture method of the present invention is simple, and manufacturing step is few, matches with cone core slide block by sleeve mainly through a mould, and its plant equipment related to is less, it is not necessary to significantly high accuracy computation.And the present invention can be effectively improved plug yield rate.The method applicability of the present invention is wide, is suitable for the manufacture processing of the plug of various different-diameter.
Accompanying drawing explanation
Fig. 1 is the structure chart of middle sleeve blank of the present invention.
Fig. 2 is the structure chart boring core slide block in the present invention.
Fig. 3 is the installation diagram of cone core slide block and sleeve blank.
Fig. 4 is the deformation principle schematic diagram of middle sleeve blank of the present invention.
Fig. 5 is the structure chart after middle sleeve blank of the present invention deformation.
Fig. 6 is the structure chart of finished product plug in the present invention.
In figure: 1 plug 11 sleeve
111 sleeve blank 112 blind holes
113 annular grooves 12 bore core slide block
121 tapped through hole 2 moulds
21 die cavities
Detailed description of the invention
The structure of Figure of description depicted, ratio, size etc., all only in order to coordinate the disclosed content of description, understand for those skilled in the art and read, it is not limited to the enforceable qualifications of the present invention, therefore do not have technical essential meaning, the adjustment of the modification of any structure, the change of proportionate relationship or size, under not affecting effect that the present invention can be generated by and the purpose that can reach, all should still drop in the scope that disclosed technology contents can be contained.Simultaneously, in this specification cited as " on ", D score, "front", "rear", the term such as " centre ", it is merely convenient to understanding of narration, and it is not used to limit the enforceable scope of the present invention, the change of its relativeness or adjustment, changing under technology contents without essence, when being also considered as the enforceable category of the present invention.
As shown in Figure 6, heretofore described plug 1 includes sleeve 11 and cone core slide block 12, and described cone core slide block 12 is in the blind hole 112 that sleeve 11 is axial.Its operation principle is: when boring core slide block 12 and being displaced outwardly, outwardly against sleeve 11, so that sleeve 11 swelling realizes closure in the heat-transfer pipe of heat exchanger.The material of sleeve 11 is typically chosen the good material of plasticity, and its intensity should not be greater than heat-transfer pipe, but to consider the suitability to heat transfer tube material, so sleeve 11 is consistent with the material of heat-transfer pipe in the present embodiment.Additionally, because plug 1 operationally its sleeve 1 is by boring the athletic meeting generation radial plastic deformation of core slide block 12, so cone core slide block 12 hardness in the present invention is more than the hardness of sleeve 11, and then guarantee that sleeve 11 can by cone core slide block 12 outwardly against deformation.
In conjunction with Fig. 1-Fig. 6, the concretely comprising the following steps of the processing method of plug in a kind of heat transfering tube of heat exchanger of the present invention:
One, the size of plug 1 is calculated according to heat-transfer pipe specification, the profile of plug 1 is determined by sleeve 11, during use, plug 1 to insert heat-transfer pipe and play plugging action, so sleeve 11 external diameter is not more than the internal diameter of heat-transfer pipe to guarantee that plug 1 can easily insert heat-transfer pipe.
Two, as shown in Figure 1 and Figure 4, select bar to make sleeve blank 111, bar is carried out solution treatment, so as to obtain single phase austenite grain structure, then bar is processed into the truncated cone shape including large end face and small end face, processes blind hole 112 from frustum of a cone large end face side along axis.One mould 2 of dimensioned according to sleeve blank 111 simultaneously, described mould 2 has a columned die cavity 21, and the internal diameter of described die cavity 21 and the small end face diameter of sleeve blank 111 adapt.In the present embodiment, verify according to test of many times, the outer surface gradient of described sleeve blank 111 can meet job demand when being 3 °, can reduce the deformation quantity of the follow-up plastic deformation of sleeve blank 111 simultaneously as far as possible, it is prevented that causes that sleeve blank 111 ftractures and scraps because deformation is excessive.In subsequent step, because also sleeve blank 111 is carried out further machining, so the volume of described sleeve blank 111 is at least 1.3 times of finished product plug volume, namely the volume of sleeve blank 111 is at least 1.3 times of finished product sleeve 11 volume, and then reserves allowance for follow-up machining.
Three, in conjunction with Fig. 1 and Fig. 2, select titanium alloy or stainless steel bar base to make cone core slide block 12, rod base adopts the mode that solution treatment and Ageing Treatment combine carry out preliminary treatment, or adopts the mode that quenching and tempering combine to carry out preliminary treatment；Then rod base is processed into the truncated cone shape including large end face and small end face, and offers tapped through hole 121 along frustum of a cone axis.Blind hole 112 diameter on described sleeve blank 111 is not less than the large end face diameter of cone core slide block 12, and wherein preferably scheme is diameter about the 0.5mm bigger than the large end face diameter of cone core slide block 12 of described blind hole 112；Its objective is to guarantee there is sufficiently large frictional force between blind hole 112 and cone core slide block 12, in order to during subsequent installation plug, erector's prodigiosin easily screws in the tapped through hole 121 of cone core slide block 12.In the present embodiment, fillet is processed in cone core slide block 12 small end face side, in order to movement during work.When in verification experimental verification, this step, the outer surface gradient of cone core slide block 12 is 3 °, working effect is the most desirable, both can meet job demand, and can adapt with the outer surface gradient of sleeve blank 111 again.
Four as it is shown on figure 3, load cone core slide block 12 large end face inwardly in the blind hole 112 of sleeve blank 111.
Five, in conjunction with Fig. 1, Fig. 2 and Fig. 4, the sleeve blank 111 small end face side installing cone core sliding 12 is put in the mold cavity 21 processed inwardly, applying an external force F by pressurized equipment makes sleeve blank 111 fully enter die cavity 21 from small end face side to large end face side, sleeve blank 111 is deformed because of the restriction effect of die cavity 21, sleeve blank 111 becomes cylinder as shown in Figure 5 from truncated cone, the inwall of sleeve blank 111 is because deformation can fit with cone core slide block 12, cone core slide block 12 is limited in the blind hole 112 of sleeve blank 111.Simultaneously as the hardness of described cone core slide block 12 is more than the hardness of sleeve blank 111, so cone core slide block 12 will not deform, thus being effective to ensure that plug 1 working effect in use.In this step, the die cavity 21 of mould 2 is to the restricted effect of sleeve blank 111, but the die cavity 21 of mould 2 also can be produced certain squeezing action by sleeve blank 111 simultaneously, so the die cavity 21 in order to ensure mould 2 will not deform under the squeezing action of sleeve blank 111, the material hardness that described mould 2 uses is more than the material hardness of sleeve blank 111.
Six, in conjunction with Fig. 4, Fig. 5 and Fig. 6, when sleeve hair 111 is completely into after in the die cavity 21 of mould 2, being taken out by sleeve blank 111 from the die cavity 21 of mould 2.For the ease of the taking-up of sleeve blank 111, the die cavity 21 of described mould 2 is through mould, and staff can apply external force from any side of die cavity 21 and be ejected from die cavity 21 by sleeve blank 111.The blind hole 112 of sleeve blank 111, outer wall and end are carried out machining after taking out by sleeve blank 111, process multiple annular groove 113 including the outer wall at sleeve blank 111, two ends to sleeve blank 111 process chamfering etc..Obtain the sleeve 11 of finished product after processing, and then also just obtain finished product plug 1.
In sum, the processing method of plug in a kind of heat transfering tube of heat exchanger of the present invention, it is possible to solve technological requirement in prior art high, the problem of complicated operation.So, the present invention effectively overcomes practical problems more of the prior art thus having significantly high value and using meaning.
Above-mentioned embodiment is illustrative principles of the invention and effect thereof only, not for the restriction present invention.The present invention also has many aspects can improve under the premise of overall thought, all for those skilled in the art under the spirit and category of the present invention, above-described embodiment can modified or changing.Therefore, art has usually intellectual such as modifying without departing from all equivalences completed under disclosed spirit and technological thought or change, must be contained by the claim of the present invention.
Claims (6)
1. a processing method for plug in heat transfering tube of heat exchanger, described plug includes sleeve and cone core slide block, and described cone core slide block is in the blind hole that sleeve is axial, it is characterised in that the processing method of described plug comprises the following steps:
One, the size of plug is calculated according to heat-transfer pipe specification；
Two, bar is selected to make sleeve blank, bar is carried out solution treatment, so as to obtain single phase austenite grain structure, then bar is processed into the truncated cone shape including large end face and small end face, blind hole is processed along axis from frustum of a cone large end face side, one mould of dimensioned according to sleeve blank simultaneously, described mould has the small end face diameter of a columned die cavity, the internal diameter of described die cavity and sleeve blank and adapts；
Three, titanium alloy or stainless steel bar base is selected to make cone core slide block, rod base adopt the mode that solution treatment and Ageing Treatment combine carry out preliminary treatment or adopt the mode that quenching and tempering combine to carry out preliminary treatment, rod base is processed into the truncated cone shape including large end face and small end face, offering tapped through hole along frustum of a cone axis, the blind hole diameter on described sleeve blank is not less than cone core slide block large end face diameter；
Four, cone core slide block large end face is loaded inwardly in the blind hole of sleeve blank；
Five, the sleeve blank small end face side installing cone core slide block is put in the mold cavity processed inwardly, sleeve blank is made to fully enter die cavity from small end face side to large end face side by pressurized equipment, sleeve blank is because squeezing action becomes cylindrical from truncated cone, and the inwall of sleeve blank fits with cone pellet；
Six, sleeve blank is taken out from the die cavity of mould, the blind hole of sleeve blank, outer wall and end are carried out machining and obtains finished product plug.
2. the processing method of plug in a kind of heat transfering tube of heat exchanger according to claim 1, it is characterised in that: the volume of described sleeve blank is at least 1.3 times of finished product plug volume.
3. the processing method of plug in a kind of heat transfering tube of heat exchanger according to claim 1, it is characterised in that: the outer surface gradient of described step 2 middle sleeve blank is 3 °.
4. the processing method of plug in a kind of heat transfering tube of heat exchanger according to claim 1, it is characterised in that: the outer surface gradient boring core slide block in described step 3 is 3 °.
5. the processing method of plug in a kind of heat transfering tube of heat exchanger according to claim 1, it is characterised in that: the hardness of described cone core slide block is more than the hardness of sleeve.
6. the processing method of plug in a kind of heat transfering tube of heat exchanger according to claim 1, it is characterised in that: the material of described sleeve is identical with the material of heat-transfer pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410848524.6A CN105798542B (en) | 2014-12-31 | 2014-12-31 | The processing method of plug in a kind of heat transfering tube of heat exchanger |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410848524.6A CN105798542B (en) | 2014-12-31 | 2014-12-31 | The processing method of plug in a kind of heat transfering tube of heat exchanger |
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| Publication Number | Publication Date |
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| CN105798542A true CN105798542A (en) | 2016-07-27 |
| CN105798542B CN105798542B (en) | 2018-06-01 |
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| CN201410848524.6A Active CN105798542B (en) | 2014-12-31 | 2014-12-31 | The processing method of plug in a kind of heat transfering tube of heat exchanger |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108591453A (en) * | 2018-06-08 | 2018-09-28 | 绵阳安立机械有限公司 | One bulb rises formula plug and its processing technology |
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|---|---|---|---|---|
| US4436117A (en) * | 1982-12-02 | 1984-03-13 | Martin John E | Leak resistant plug assembly |
| EP0404637A1 (en) * | 1989-06-23 | 1990-12-27 | Framatome | Sealing plug for a steam generator tube |
| CN1465452A (en) * | 2002-07-05 | 2004-01-07 | 郭善忠 | Metal-plastics composite pipe and mfg. method thereof |
| CN102974985A (en) * | 2012-12-03 | 2013-03-20 | 西安西工大超晶科技发展有限责任公司 | Manufacture method for nuclear power station steam generator heat transfer tube end cap |
| CN103737263A (en) * | 2013-12-25 | 2014-04-23 | 西安西工大超晶科技发展有限责任公司 | Roller expansion type mechanical plug for heat transfer tube of steam generator and manufacturing method thereof |
| CN203718276U (en) * | 2013-12-25 | 2014-07-16 | 西安西工大超晶科技发展有限责任公司 | Drawing core expansion type mechanical end cap for heat transfer pipe |
-
2014
- 2014-12-31 CN CN201410848524.6A patent/CN105798542B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4436117A (en) * | 1982-12-02 | 1984-03-13 | Martin John E | Leak resistant plug assembly |
| EP0404637A1 (en) * | 1989-06-23 | 1990-12-27 | Framatome | Sealing plug for a steam generator tube |
| CN1465452A (en) * | 2002-07-05 | 2004-01-07 | 郭善忠 | Metal-plastics composite pipe and mfg. method thereof |
| CN102974985A (en) * | 2012-12-03 | 2013-03-20 | 西安西工大超晶科技发展有限责任公司 | Manufacture method for nuclear power station steam generator heat transfer tube end cap |
| CN103737263A (en) * | 2013-12-25 | 2014-04-23 | 西安西工大超晶科技发展有限责任公司 | Roller expansion type mechanical plug for heat transfer tube of steam generator and manufacturing method thereof |
| CN203718276U (en) * | 2013-12-25 | 2014-07-16 | 西安西工大超晶科技发展有限责任公司 | Drawing core expansion type mechanical end cap for heat transfer pipe |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108591453A (en) * | 2018-06-08 | 2018-09-28 | 绵阳安立机械有限公司 | One bulb rises formula plug and its processing technology |
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| CN105798542B (en) | 2018-06-01 |
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