CN103878457B - Graphite electrode and method for steel pipe inner diameter machining with graphite electrode - Google Patents
Graphite electrode and method for steel pipe inner diameter machining with graphite electrode Download PDFInfo
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- CN103878457B CN103878457B CN201410101643.5A CN201410101643A CN103878457B CN 103878457 B CN103878457 B CN 103878457B CN 201410101643 A CN201410101643 A CN 201410101643A CN 103878457 B CN103878457 B CN 103878457B
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Abstract
The invention discloses a graphite electrode and a method for steel pipe inner diameter machining with the graphite electrode. The graphite electrode comprises an insulation shell, a connection cable, an insulation bearing plate and a graphite electrode head. The insulation shell is fixedly connected to the top end of the insulation bearing plate. One end of the connection cable penetrates through the insulation shell and is electrically connected with the graphite electrode head. The graphite electrode head comprises a connection portion and a working portion integrally connected to the bottom end of the connection portion. The connection portion is fixed to the insulation bearing plate. An electrolysis unit is composed of the graphite electrode, a bearing seat, a steel pipe, an electrolysis solution box and a sediment box. The electrolysis unit machines a stainless steel pipe inner diameter and can accurately correct the stainless steel pipe inner diameter, and the defects of wall deviation, protruding and the like caused by extrusion forming are overcome. Long stainless steel pipes with the length being more than 3 meters can be machined, the defects of traditional machining are overcome, working efficiency is high and the graphite electrode and the method for steel pipe inner diameter machining with the graphite electrode are friendly to the environment and free of pollution.
Description
Technical field
The present invention relates to a kind of graphite electrode, and the method for carrying out pipe diameter processing using graphite electrode.
Background technology
Current some seamless stainless steel long tubes on the market, due to being produced using extrusion process, internal diameter size control is uniform,
Usually there are inclined wall or oval raised phenomenon, lead to not to meet some to stainless steel tube internal diameter size degree of accuracy and equal
Evenness requires that higher industry uses (such as rotary target material production, it is desirable to stainless steel tube internal diameter diameter 125mm, id tolerance chi
Very little positive and negative 0.5mm, within wall thickness difference 0.5mm, but often beyond 2~3 times of left sides of tolerance dimension in existing long stainless tube
It is right).
Due to stainless steel tube pipe it is longer, using traditional mechanical turning, can only about 0.5 meter of processing length, for 3 meters of length
Long stainless tube, it is impossible to carry out turnery processing pipe diameter.
The content of the invention
One of the technical problem to be solved is to provide a kind of graphite electrode, can accurately correct stainless steel tube
Internal diameter.
The present invention is to solve one of above-mentioned technical problem by the following technical programs：A kind of graphite electrode, including one is exhausted
Edge shell, connection cable, an insulation tray and a graphite electrode head；The insulation crust is fixedly connected on insulation tray
Top；One end of the connection cable passes through insulation crust, and electrically connects with graphite electrode head；The graphite electrode head includes one
Connecting portion and a work department of the connecting portion bottom is integrally linked to, the connecting portion is fixed on insulation tray；One steel pipe
The internal diameter at top 0.2mm bigger than the external diameter of the insulation tray, when in running order, the insulation tray is placed in steel
In pipe.
Preferably, single-revolution hole is provided with the longitudinal axis of the insulation tray, the bottom of the rotary hole inwall is equipped with again
Several first screw threads；The outer wall of the connecting portion is equipped with a plurality of the second screw threads being meshed with first screw thread, and institute
State connecting portion to be connected on the rotary hole of insulation tray by first screw thread and the second screw thread rotation.
Preferably, the rotary hole is two grades of shoulder holes, and first screw thread is located at the macropore inwall of two grades of shoulder holes,
And the top of the connecting portion can be connected to the aperture bottom of the shoulder hole.
Preferably, also including an at least exhaust unit, the exhaust unit includes a return port and the row for communicating with each other
Pore, on insulation tray, the steam vent is in the work department for the return port.
Preferably, the exhaust unit also includes a breach, and the breach is located at the lower surface of insulation tray, the backflow
The insertion successively of hole, breach and steam vent.
Preferably, the radial section of the breach is trapezoidal.
Preferably, the lower surface of the work department forms depressed part corresponding to caving inward at the steam vent.
The two of the technical problem to be solved are that offer is a kind of to be carried out in steel pipe using described graphite electrode
The method of footpath processing, can process more than 3 meters of long stainless tube, and high working efficiency is environment friendly and pollution-free.
The present invention is to solve the two of above-mentioned technical problem by the following technical programs：It is a kind of using described graphite electrode
The method for carrying out pipe diameter processing, first configures an electrolysis unit, the electrolysis unit include graphite electrode, a fulcrum bearing, one
Steel pipe, an electrolyte tank and a settling tank；The fulcrum bearing is provided with a groove, an inlet opening and an at least osculum；It is described
Groove is located at the upper surface of fulcrum bearing, and the steel pipe is inserted in the groove, and is provided with one between the upper surface and steel pipe of groove
Sealing ring；The steel pipe, inlet opening and electrolyte tank are sequentially communicated；The osculum is connected respectively with steel pipe, settling tank；One is electric
Source electrically connects respectively with the graphite electrode and steel pipe；
The method of the pipe diameter processing specifically includes following steps：
(1) turnery processing is carried out to the inwall of the steel pipe top, to oneself processing part length be 100mm, internal diameter ratio
The big 0.2mm of dish external diameter is accepted in the insulation of graphite electrode, and the endoporus of oneself processing part can not wall partially；
(2) by penstock installation on the groove of the fulcrum bearing, and with the sealing ring sealed steel pipe bottom, steel pipe is made
For anode；Then electrolyte is passed through into steel pipe and the electrolyte tank, and graphite electrode is placed in steel pipe and electrolyte contacts；
(3) electrolysis unit connects unidirectional current, and to steel pipe inner wall electrolytic etching is carried out；When steel pipe inner wall erodes to internal diameter
When accepting dish external diameter more than the insulation, graphite electrode meeting falling head continues to corrode the steel pipe inner wall near graphite electrode, institute
Stating insulation tray above section will not be corroded again；
(4) in electrolytic process, electrolyte is constantly led to toward in the electrolyte tank, then the electrolyte in electrolyte tank
Flowed in steel pipe by the inlet opening, at the same the electrolyte in steel pipe can carry the precipitate produced by electrolysis flow through it is described
Osculum, finally flows into and carry out in the settling tank standing separation；Settling tank and electrolyte tank are connected by pipeline, are being electrolysed
Cheng Zhong, electrolyte constantly carries out above-mentioned circulation.
The beneficial effects of the present invention is：
1st, can accurately correct stainless steel tube internal diameter, it is to avoid the defect such as inclined wall, projection that extrusion molding is caused, can meet
The industry higher to pipe diameter required precision is used.
2nd, traditional turnery processing can only processing length be 0.5 meter or so of steel pipe, the processing method of the present invention can add
The long stainless tube that more than 3 meters of work, compensate for the defect of traditional mechanical processing.
3rd, using the electrolysis unit and processing method high working efficiency of the present invention, per meter of pipe diameter of processing only needs to take about
1h。
4th, using the processing method environmental protection of the present invention, because electrolysate only has ferric hydroxide precipitate and other elemental impurities
Precipitation and free of contamination hydrogen.
5th, for sodium chloride solution, electrolysis finishes the repeatable utilization of Jing precipitations, great economy to the electrolyte that the present invention is adopted.
Description of the drawings
With reference to the accompanying drawings in conjunction with the embodiments the invention will be further described.
Fig. 1 is the structural representation of graphite electrode in the present invention.
Fig. 2 is the structural representation of electrolysis unit in the present invention.
Fig. 3 is electrolysis principle figure in the present invention.
Specific embodiment
Refer to Fig. 1, a kind of graphite electrode 1, including an insulation crust 11, connection cable 12, insulation tray 13,
Graphite electrode head 14 and at least an exhaust unit 15；The insulation crust 11 is fixedly connected on the top of insulation tray 13；Institute
One end of connection cable 12 is stated through insulation crust 11, and is electrically connected with graphite electrode head 14；Connection cable 12 is used for graphite electricity
Pole 1 is connected with DC source.
Referring again to Fig. 1, single-revolution hole 131 is provided with the longitudinal axis of the insulation tray 13, the inwall of rotary hole 131
Bottom is equipped with a plurality of first screw threads (not shown)；I.e. described rotary hole 131 is two grades of shoulder holes, and first screw thread is located at
The inwall of macropore 1311 of two grades of shoulder holes, and hereinafter described the top of connecting portion 141 can be connected to the aperture of the shoulder hole
1312 bottoms, being so designed that can be such that graphite electrode head 14 is more firmly fixed on insulation tray 13.It is interior at the top of one steel pipe 3
Footpath 0.2mm bigger than the external diameter of the insulation tray 13, when in running order, the insulation tray 13 is placed in steel pipe 3
It is interior；Insulation tray 13 is used to control pipe diameter processing dimension, and its external diameter directly determines the internal diameter after stainless steel tube processing.
Referring again to Fig. 1, the graphite electrode head 14 includes a connecting portion 141 and is integrally linked to the bottom of connecting portion 141
One work department 142 at end, the connecting portion 141 is fixed on insulation tray 13.The outer wall of the connecting portion 141 is equipped with multiple
Several the second screw threads (not shown) being meshed with first screw thread, and the connecting portion 141 by first screw thread and
Second screw thread rotation is connected on the rotary hole 131 of insulation tray 13；Graphite electrode head 14 adopts spiral shell with insulation tray 13
Stricture of vagina is rotatably connected and can ensure that graphite electrode head 14 is concentric with insulation tray 13, while facilitating dismounting and change part.The work
The lower surface in portion 142 forms depressed part 1421 corresponding to caving inward at the steam vent, to guide hydrogen to enter, makes hydrogen
Quick diffusion.
Referring again to Fig. 1, the exhaust unit 15 includes a return port 151 and the steam vent 152 for communicating with each other, and
One breach 153, on insulation tray 13, the steam vent 152 is in the work department 142 for the return port 151；It is described to lack
Mouthfuls 153 located at insulation tray 13 lower surface, the return port 151, breach 153 and the insertion successively of steam vent 152, and described
The radial section of breach 153 is trapezoidal.The return port 151 is used to arrange hydrogen and backflow electrolyte, and the steam vent 152 is used for
Gas produced by discharge cell reaction, the setting of the breach 153 makes electrolysis liquid energy faster more swimmingly flow back.
Referring again to Fig. 2, a kind of method for carrying out pipe diameter processing using described graphite electrode 1, first configuration one is electric
Solution device 100, the electrolysis unit 100 includes graphite electrode 1, a fulcrum bearing 2, a steel pipe 3, an electrolyte tank 4 and a precipitation
Case 5；The fulcrum bearing 2 is provided with a groove 21, an inlet opening 22 and an at least osculum 23；The groove 21 is located at fulcrum bearing
2 upper surface, the steel pipe 3 is inserted in the groove 21, and a sealing ring 6 is provided between the upper surface and steel pipe 3 of groove 21；
The steel pipe 3, inlet opening 22 and electrolyte tank 4 are sequentially communicated；The osculum 23 is connected respectively with steel pipe 3, settling tank 5；One
Power supply 7 is electrically connected respectively with the graphite electrode 1 and steel pipe 3；
The operation principle of the processing method for inside diameter of the steel pipe 3 is as follows：
As shown in figure 3, using adjustable current DC source (i.e. power supply 7) (input voltage 380V, input power 9kw).No
Rust steel steel pipe 3 connects DC source (i.e. power supply 7) just extremely anode, and graphite electrode 1 connects DC source (i.e. power supply 7) negative pole for the moon
Pole, and with sodium chloride solution as electrolyte.
Cell reaction：
Anode：Fe+-2e-→Fe2-Negative electrode：2H2O+2e-→2OH-+H2↑
Net reaction：Fe+2H2O→Fe(OH)2+H2↑
The Fe (OH) that cell reaction is produced2Fe (OH) is generated with air contact reaction3(reddish-brown precipitation), in rustless steel
The other elements such as Ni, Cr are switched to simple substance due to the electrolytic separation of Fe and form precipitation.
Referring again to Fig. 2, the method for the internal diameter of the steel pipe 3 processing specifically includes following steps：
(1) turnery processing is carried out to the inwall at the top of the steel pipe 3, the length to oneself processing part is 100mm, internal diameter ratio
The big 0.2mm of the external diameter of insulation tray 13 of graphite electrode 1, and the endoporus of oneself processing part can not wall partially because it is described oneself process
Part is used to calibrate the direction that the corrosion of stainless-steel pipe 3 is carried out.
(2) steel pipe 3 is arranged on the groove 21 of the fulcrum bearing 2, and with the bottom of sealing ring sealed steel pipe 3, is incited somebody to action
Steel pipe 3 is used as anode；Then electrolyte is passed through into steel pipe 3 and the electrolyte tank 4, and by graphite electrode 1 be placed in steel pipe 3 with
Electrolyte contacts.
(3) electrolysis unit 100 connects unidirectional current (380V), and to the inwall of steel pipe 3 electrolytic etching is carried out；When in steel pipe 3
Wall erosion to internal diameter more than it is described insulation 13 external diameter of tray when, graphite electrode 1 can falling head, continue corrode near graphite electricity
The inwall of steel pipe 3 of pole 1, the above section of insulation tray 13 will not be corroded again.
Because Anode-cathode Distance is nearer, the electric current density between two-stage is bigger, and corrosion rate is also bigger, if the inwall of steel pipe 3
There is inclined wall or have projection, then because bossing or inclined wall part are relatively near apart from the graphite electrode head 14, thus corrosion
It is relatively fast, so ensure that the homogeneity of the inner wall size of steel pipe 3 after corrosion.
(4) in electrolytic process, electrolyte, the then electrolysis in electrolyte tank 4 are constantly led to toward in the electrolyte tank 4
Liquid is arrived in steel pipe 3 by the stream of the inlet opening 22, while the electrolyte in steel pipe 3 can carry the precipitation logistics produced by electrolysis
Osculum 23 described in Jing, finally flow into and carry out in the settling tank 5 standing separation；Settling tank and electrolyte tank are connected by pipeline
Connect, in electrolytic process, electrolyte constantly carries out above-mentioned circulation.
Precipitate produced by electrolysis can flow into settling tank 5 due to action of gravity with electrolyte, and electrolyte is in settling tank 5
Can use a pipeline to be passed through in electrolyte tank 4 Jing after staticly settling to be circulated.Electrolyte circulation can not only ensure conversion zone
Ion concentration stablize, and taken away the discharged heat of electrolysis, be conducive to quickly carrying out for cell reaction.
The present invention has advantages below：
1st, can accurately correct the internal diameter of stainless steel tube 3, it is to avoid the defect such as inclined wall, projection that extrusion molding is caused, can expire
Foot requires that higher industry is used to the internal diameter of steel pipe 3.
2nd, traditional turnery processing can only processing length be 0.5 meter or so of steel pipe 3, the processing method of the present invention can add
The long stainless tube that more than 3 meters of work, compensate for the defect of traditional mechanical processing.
3rd, using the electrolysis unit 100 and processing method high working efficiency of the present invention, processing per meter of the internal diameter of steel pipe 3 only needs consumption
When about 1h.
4th, using the processing method environmental protection of the present invention, because electrolysate only has ferric hydroxide precipitate and other elemental impurities
Precipitation and free of contamination hydrogen.
5th, for sodium chloride solution, electrolysis finishes the repeatable utilization of Jing precipitations, great economy to the electrolyte that the present invention is adopted.
Claims (7)
1. a kind of graphite electrode, it is characterised in that：Including an insulation crust, connection cable, an insulation tray, a graphite electrode
Head and an at least exhaust unit；The insulation crust is fixedly connected on the top of insulation tray；One end of the connection cable
Through insulation crust, and electrically connect with graphite electrode head；The graphite electrode head includes a connecting portion and is integrally linked to the company
One work department of socket part bottom, the connecting portion is fixed on insulation tray, and the external diameter of the work department is accepted less than insulation
The external diameter of disk；The internal diameter of one steel pipe top 0.2mm bigger than the external diameter of the insulation tray, it is described when in running order
Insulation tray is placed in steel pipe；
The exhaust unit includes a return port and the steam vent for communicating with each other, and the return port, should on insulation tray
Steam vent is in the work department.
2. a kind of graphite electrode as claimed in claim 1, it is characterised in that：Set once at the longitudinal axis of the insulation tray
Turn hole, the bottom of the rotary hole inwall is equipped with a plurality of first screw threads；The outer wall of the connecting portion is equipped with a plurality of and institute
The second screw thread that the first screw thread is meshed is stated, and the connecting portion is connected to absolutely by first screw thread and the second screw thread rotation
On the rotary hole of edge tray.
3. a kind of graphite electrode as claimed in claim 2, it is characterised in that：The rotary hole is two grades of shoulder holes, described the
One screw thread is located at the macropore inwall of two grades of shoulder holes, and the top of the connecting portion can be connected to the aperture of two grades of shoulder holes
Bottom.
4. a kind of graphite electrode as claimed in claim 1, it is characterised in that：The exhaust unit also includes a breach, and this lacks
Mouth is located at the lower surface of insulation tray, the insertion successively of the return port, breach and steam vent.
5. a kind of graphite electrode as claimed in claim 4, it is characterised in that：The radial section of the breach is trapezoidal.
6. a kind of graphite electrode as claimed in claim 1, it is characterised in that：The lower surface of the work department corresponds to the row
Cave inward at pore, form depressed part.
7. the method that the graphite electrode described in a kind of utilization claim 1 carries out pipe diameter processing, it is characterised in that：First configure
One electrolysis unit, the electrolysis unit includes graphite electrode, a fulcrum bearing, a steel pipe, an electrolyte tank and a settling tank；It is described
Fulcrum bearing is provided with a groove, an inlet opening and an at least osculum；The groove is located at the upper surface of fulcrum bearing, the steel pipe
It is inserted in the groove, and a sealing ring is provided between the upper surface and steel pipe of groove；The steel pipe, inlet opening and electrolyte tank
It is sequentially communicated；The osculum is connected respectively with steel pipe, settling tank；One power supply is electrically connected respectively with the graphite electrode and steel pipe
Connect；
The method of the pipe diameter processing specifically includes following steps：
(1) turnery processing is carried out to the inwall of the steel pipe top, is 100mm to oneself length of processing part, internal diameter compares graphite
The big 0.2mm of dish external diameter is accepted in the insulation of electrode, and the endoporus of oneself processing part can not wall partially；
(2) by penstock installation on the groove of the fulcrum bearing, and with the sealing ring sealed steel pipe bottom, using steel pipe as sun
Pole；Then electrolyte is passed through into steel pipe and the electrolyte tank, and graphite electrode is placed in steel pipe and electrolyte contacts；
(3) electrolysis unit connects unidirectional current, and to steel pipe inner wall electrolytic etching is carried out；It is more than when steel pipe inner wall erodes to internal diameter
During the insulation undertaking dish external diameter, graphite electrode meeting falling head continues to corrode the steel pipe inner wall near graphite electrode, described exhausted
Edge tray above section will not be corroded again；
(4) in electrolytic process, electrolyte is constantly led to toward in the electrolyte tank, then the electrolyte in electrolyte tank passes through
The inlet opening is flowed in steel pipe, while the electrolyte in steel pipe can carry the precipitate produced by electrolysis flows through the draining
Hole, finally flows into and carry out in the settling tank standing separation；Settling tank and electrolyte tank are connected by pipeline, in electrolytic process
In, electrolyte constantly carries out above-mentioned circulation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410101643.5A CN103878457B (en) | 2014-03-19 | 2014-03-19 | Graphite electrode and method for steel pipe inner diameter machining with graphite electrode |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410101643.5A CN103878457B (en) | 2014-03-19 | 2014-03-19 | Graphite electrode and method for steel pipe inner diameter machining with graphite electrode |
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| CN103878457A CN103878457A (en) | 2014-06-25 |
| CN103878457B true CN103878457B (en) | 2017-05-17 |
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| CN111037013A (en) * | 2019-12-06 | 2020-04-21 | 西安铂力特增材技术股份有限公司 | Electrolytic machining device for internal hole structure part |
| CN114473378B (en) * | 2022-01-07 | 2023-03-14 | 西安泰金新能科技股份有限公司 | Cathode roller machining device with high conductivity and machining process thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| DE3528056C1 (en) * | 1985-08-05 | 1986-10-16 | Daimler-Benz Ag, 7000 Stuttgart | Electrode arrangement for the electrochemical metal removal process (ECM process) for producing a toothing |
| CN87210609U (en) * | 1987-09-30 | 1988-10-05 | 大连油泵油嘴厂 | Electrolytic machine for removing burr of long fuel spray nozzle |
| JP2003260618A (en) * | 2002-03-06 | 2003-09-16 | Sankyo Seiki Mfg Co Ltd | Electro-chemical machining method, and electro-chemical machine |
| CN101870018B (en) * | 2010-05-31 | 2013-01-16 | 重庆红江机械有限责任公司 | Electrochemical machining method of fuel nozzle spray orifice inner orifice and adopted electrochemical fixture |
| CN202317332U (en) * | 2011-08-08 | 2012-07-11 | 河南理工大学 | Special tool negative pole for electrochemically machining micro pits on inner hole wall surface of part |
| CN102896383B (en) * | 2012-10-10 | 2015-03-25 | 南京航空航天大学 | Electrolytic machining method of difficult-to-cut material, fine-module internal gear and device |
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