CN113634953A - Preheating and heat preservation method for valve seat - Google Patents
Preheating and heat preservation method for valve seat Download PDFInfo
- Publication number
- CN113634953A CN113634953A CN202110980134.4A CN202110980134A CN113634953A CN 113634953 A CN113634953 A CN 113634953A CN 202110980134 A CN202110980134 A CN 202110980134A CN 113634953 A CN113634953 A CN 113634953A
- Authority
- CN
- China
- Prior art keywords
- valve seat
- induction heating
- surfacing
- preheating
- heating device
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000000034 method Methods 0.000 title claims abstract description 30
- 238000004321 preservation Methods 0.000 title claims abstract description 10
- 238000010438 heat treatment Methods 0.000 claims abstract description 77
- 230000006698 induction Effects 0.000 claims abstract description 53
- 239000011248 coating agent Substances 0.000 claims abstract description 16
- 238000000576 coating method Methods 0.000 claims abstract description 16
- 239000002184 metal Substances 0.000 claims abstract description 12
- 238000001816 cooling Methods 0.000 claims abstract description 5
- 238000003466 welding Methods 0.000 claims description 11
- 239000000843 powder Substances 0.000 claims description 8
- 239000007921 spray Substances 0.000 claims description 8
- 238000010792 warming Methods 0.000 claims description 7
- 238000005238 degreasing Methods 0.000 claims 1
- 238000007788 roughening Methods 0.000 claims 1
- 238000010301 surface-oxidation reaction Methods 0.000 abstract 1
- 230000001360 synchronised effect Effects 0.000 description 3
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 239000010963 304 stainless steel Substances 0.000 description 1
- 229910000619 316 stainless steel Inorganic materials 0.000 description 1
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- 229910000589 SAE 304 stainless steel Inorganic materials 0.000 description 1
- 229910001347 Stellite Inorganic materials 0.000 description 1
- 238000005422 blasting Methods 0.000 description 1
- AHICWQREWHDHHF-UHFFFAOYSA-N chromium;cobalt;iron;manganese;methane;molybdenum;nickel;silicon;tungsten Chemical compound C.[Si].[Cr].[Mn].[Fe].[Co].[Ni].[Mo].[W] AHICWQREWHDHHF-UHFFFAOYSA-N 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K37/00—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K10/00—Welding or cutting by means of a plasma
- B23K10/02—Plasma welding
- B23K10/027—Welding for purposes other than joining, e.g. build-up welding
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Plasma & Fusion (AREA)
- Optics & Photonics (AREA)
- General Induction Heating (AREA)
Abstract
The invention provides a preheating and heat-preserving method for a valve seat, which comprises the following steps: 1) fixing a valve seat on a rotary worktable provided with an induction heating device, wherein the induction heating device comprises an induction heating ring, and the valve seat is fixed in the induction heating ring; 2) opening the rotary worktable to enable the valve seat to perform circular motion; 3) starting the induction heating device, and preheating the valve seat in the induction heating ring; 4) after the temperature of the valve seat rises to the preheating temperature, starting plasma surfacing equipment to carry out plasma surfacing, so that a layer of high-hardness metal or metal carbide coating is surfaced on the surface of the valve seat; 5) and after surfacing of the surface coating of the valve seat is finished, closing the plasma surfacing equipment and the induction heating device, putting the valve seat subjected to plasma surfacing into a heating furnace, preserving the heat for a period of time, and slowly cooling to room temperature. The preheating and heat preservation method for the valve seat can quickly heat the valve seat to the preset temperature and keep the preset temperature, and the surface oxidation degree of the valve seat is slight.
Description
Technical Field
The invention relates to the technical field of petrochemical industry, in particular to a preheating and heat-preserving method for a valve seat.
Background
The method for preparing the anti-corrosion wear-resistant metal or metal carbide coating on the surface of the valve seat by adopting a plasma surfacing process is a common surface engineering technology, but when surfacing a high-hardness metal or metal carbide coating, because the expansion coefficients of the coating and a matrix are different, the coating with lower toughness is easy to crack, and therefore, the valve seat is often required to be preheated and insulated during surfacing. The traditional preheating and heat preservation method adopts flame heating or the valve seat is placed on a heating plate for heating. Both heating methods have major drawbacks: (1) the flame heating speed is slow, the temperature of the workpiece is not easy to control, and the working environment is poor; (2) the heating plate is preheated by contact conduction between the valve seat and the heating plate, and because a gap is inevitably formed between the valve seat and the heating plate, the heating efficiency is low, and the heating speed is slow. Therefore, a rapid, efficient and economical heating method is urgently needed.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a preheating and heat-insulating method for a valve seat, which can realize quick heating and accurate heat insulation of the valve seat. The technical scheme adopted by the invention is as follows:
a method for preheating and maintaining a valve seat, comprising the steps of:
1) fixing a valve seat on a rotary worktable provided with an induction heating device, wherein the induction heating device comprises an induction heating ring, and the valve seat is fixed in the induction heating ring;
2) opening the rotary worktable to enable the valve seat to perform circular motion;
3) starting the induction heating device to preheat the valve seat in the induction heating ring;
4) after the temperature of the valve seat rises to the preheating temperature, starting plasma surfacing equipment to carry out plasma surfacing, so that a layer of high-hardness metal or metal carbide coating is surfaced on the surface of the valve seat;
5) and after surfacing of the surface coating of the valve seat is finished, closing the plasma surfacing equipment and the induction heating device, putting the valve seat subjected to plasma surfacing into a heating furnace, preserving the heat for a period of time, and slowly cooling to room temperature.
Preferably, the preheating and maintaining method for a valve seat, wherein: and in the step 2), the rotating speed of the rotary worktable is 0.02-0.5 r/min.
Preferably, the preheating and maintaining method for a valve seat, wherein: and 2) fixing two ends of the induction heating ring on the electrode plate, and not rotating along with the rotary worktable, wherein the distance between the induction heating ring and the valve seat is 2-3 mm.
Preferably, the preheating and maintaining method for a valve seat, wherein: the preheating temperature in the step 3) is 200-400 ℃.
Preferably, the preheating and maintaining method for a valve seat, wherein: and 4) surfacing voltage of the plasma surfacing equipment in the step 4) is 10-60V, surfacing current is 100-400A, swing amplitude of a spray welding torch is 5-50 mmm, and powder feeding rate is 10-60 g/min.
Preferably, the preheating and maintaining method for a valve seat, wherein: and 4) before plasma surfacing in the step 4), removing oil and coarsening the surfacing, cleaning the surface of the surfacing by using a solvent of alcohol and acetone for removing the oil, and blasting away oxide skin on the surface of the workpiece by coarsening to roughen the surface.
Preferably, the preheating and maintaining method for a valve seat, wherein: and in the step 5), the heat preservation temperature is 400-700 ℃, and the heat preservation time is 4-24 h.
The invention has the advantages that:
(1) the preheating and heat preservation method for the valve seat can overcome the defects that the traditional flame and resistance plate are low in heating speed, inaccurate in temperature control, easy to oxidize the surface of the valve seat and the like, can quickly heat the valve seat to a preset temperature and keep the preset temperature, and the oxidation degree of the surface of the valve seat is slight.
Drawings
Fig. 1 shows a plasma overlay welding turning device with induction heating function.
Description of the drawings: 1. the plasma surfacing welding method comprises the following steps of (1) a rotary table, (2) a valve seat, (3) an induction coil, (4) a chuck, and (5) a plasma surfacing welding gun.
Detailed Description
The present invention will be further described with reference to the following specific examples.
Examples
As shown in fig. 1, a preheating and warming method for a valve seat, comprising the steps of:
1) fixing a valve seat 2 on a rotary table 1 provided with an induction heating device, wherein the induction heating device comprises an induction heating ring 3, and the valve seat 2 is fixed in the induction heating ring 3; 3 chucks 4 are arranged on the rotary worktable 1 and can synchronously move towards the center or the outer edge of the rotary worktable 1 along the rotary worktable 1 so as to be convenient for being supported from inside to outside to fix the valve seat 2;
2) opening the rotary table 1 to enable the valve seat 2 to perform circular motion;
3) starting the induction heating device to preheat the valve seat 2 in the induction heating ring 3;
4) after the temperature of the valve seat 2 is raised to the preheating temperature, starting the plasma surfacing equipment 5 to carry out plasma surfacing, so as to build up a layer of high-hardness metal or metal carbide coating on the surface of the valve seat 2;
5) after surfacing of the surface coating of the valve seat 2 is finished, the plasma surfacing equipment 5 and the induction heating device are closed, the valve seat 2 subjected to plasma surfacing is placed in a heating furnace for heat preservation for a period of time, and then the valve seat is slowly cooled to room temperature.
The utility model provides a take plasma surfacing slewer of induction heating's function, including rotary table 1, rotary table 1 is last to set up induction heating device, induction heating device includes induction heating circle 3, set up disk seat 2 in induction heating circle 3, install 3 chuck 4 on rotary table 1, can move to rotary table 1 center or outer fringe along rotary table 1 in step, so that from inside to outside propping, with fixed disk seat 2, 2 tops of disk seat set up spray welding gun 5, spray welding gun 5 is a part on the plasma spray welding equipment, spray welding gun 5's nozzle is located the top of disk seat surface, the during operation blowout plasma torch, and synchronous blowout powder, the powder melts in the plasma torch, deposit 2 surfaces on the disk seat.
Example 1
A method for preheating and maintaining a valve seat, comprising the steps of:
1) fixing a 316 stainless steel valve seat with the diameter of 300mm on a rotary worktable provided with an induction heating device, wherein the induction heating device comprises an induction heating ring, and the valve seat is fixed in the induction heating ring;
2) starting the rotary worktable to enable the valve seat to perform circular motion, wherein the rotating speed of the rotary worktable is 0.15 r/min;
3) starting an induction heating device to preheat a valve seat in an induction heating ring, wherein the preheating temperature is 300 ℃;
4) when the temperature of the valve seat rises to the preheating temperature, starting plasma surfacing equipment to carry out plasma surfacing, wherein the surfacing voltage is 20V, the surfacing current is 225A, the swing amplitude of a spray welding torch is 28mmm, the powder feeding rate is 30g/min, and a Stellite No. 12 alloy coating is surfaced on the surface of the valve seat in a synchronous powder feeding mode;
5) after surfacing of the surface coating of the valve seat is finished, closing the plasma surfacing equipment and the induction heating device, putting the valve seat subjected to plasma surfacing into a 600 ℃ heating furnace, preserving the heat for 4 hours, and slowly cooling to room temperature.
Example 2
A method for preheating and maintaining a valve seat, comprising the steps of:
1) fixing a 304 stainless steel valve seat with the diameter of 400mm on a rotary worktable provided with an induction heating device, wherein the induction heating device comprises an induction heating ring, and the valve seat is fixed in the induction heating ring;
2) starting the rotary worktable to enable the valve seat to perform circular motion, wherein the rotating speed of the rotary worktable is 0.12 r/min;
3) starting an induction heating device to preheat a valve seat in an induction heating ring, wherein the preheating temperature is 320 ℃;
4) when the temperature of the valve seat rises to the preheating temperature, starting plasma surfacing equipment to carry out plasma surfacing, wherein the surfacing voltage is 19V, the surfacing current is 230A, the swing amplitude of a spray welding torch is 30mmm, the powder feeding rate is 28g/min, and a NiCrBSi + 35% WC alloy coating is surfaced on the surface of the valve seat in a synchronous powder feeding mode;
5) after surfacing of the surface coating of the valve seat is finished, closing the plasma surfacing equipment and the induction heating device, putting the valve seat subjected to plasma surfacing into a 600 ℃ heating furnace, preserving the heat for 4 hours, and slowly cooling to room temperature.
Finally, it should be noted that the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to examples, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, which should be covered by the claims of the present invention.
Claims (7)
1. A method for preheating and maintaining a valve seat, comprising the steps of:
1) fixing a valve seat on a rotary worktable provided with an induction heating device, wherein the induction heating device comprises an induction heating ring, and the valve seat is fixed in the induction heating ring;
2) opening the rotary worktable to enable the valve seat to perform circular motion;
3) starting the induction heating device to preheat the valve seat in the induction heating ring;
4) after the temperature of the valve seat rises to the preheating temperature, starting plasma surfacing equipment to carry out plasma surfacing, so that a layer of high-hardness metal or metal carbide coating is surfaced on the surface of the valve seat;
5) and after surfacing of the surface coating of the valve seat is finished, closing the plasma surfacing equipment and the induction heating device, putting the valve seat subjected to plasma surfacing into a heating furnace, preserving the heat for a period of time, and slowly cooling to room temperature.
2. The pre-heating and warming method for a valve seat according to claim 1, wherein: and in the step 2), the rotating speed of the rotary worktable is 0.02-0.5 r/min.
3. The pre-heating and warming method for a valve seat according to claim 1, wherein: and 2) fixing two ends of the induction heating ring on the electrode plate, and not rotating along with the rotary worktable, wherein the distance between the induction heating ring and the valve seat is 2-3 mm.
4. The pre-heating and warming method for a valve seat according to claim 1, wherein: the preheating temperature in the step 3) is 200-400 ℃.
5. The pre-heating and warming method for a valve seat according to claim 1, wherein: and 4) surfacing voltage of the plasma surfacing equipment in the step 4) is 10-60V, surfacing current is 100-400A, swing amplitude of a spray welding torch is 5-50 mmm, and powder feeding rate is 10-60 g/min.
6. The pre-heating and warming method for a valve seat according to claim 1, wherein: and 4) before plasma surfacing, degreasing and roughening the surfacing surface.
7. The pre-heating and warming method for a valve seat according to claim 1, wherein: and in the step 5), the heat preservation temperature is 400-700 ℃, and the heat preservation time is 4-24 h.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110980134.4A CN113634953A (en) | 2021-08-25 | 2021-08-25 | Preheating and heat preservation method for valve seat |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110980134.4A CN113634953A (en) | 2021-08-25 | 2021-08-25 | Preheating and heat preservation method for valve seat |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113634953A true CN113634953A (en) | 2021-11-12 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110980134.4A Pending CN113634953A (en) | 2021-08-25 | 2021-08-25 | Preheating and heat preservation method for valve seat |
Country Status (1)
| Country | Link |
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| CN (1) | CN113634953A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114932300A (en) * | 2022-06-21 | 2022-08-23 | 石河子大学 | Plasma surfacing equipment for preventing inner hole cracks from being generated |
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|---|---|---|---|---|
| CN101433990A (en) * | 2008-11-19 | 2009-05-20 | 南京宝色股份公司 | Overlaying welding method of large area carbide alloy of workpiece wear layer |
| CN102560476A (en) * | 2011-12-31 | 2012-07-11 | 席生岐 | Induction heating sintering method of metal pipe inner wall coating |
| CN105290564A (en) * | 2015-11-10 | 2016-02-03 | 中广核工程有限公司 | Sealing face surfacing method of nuclear power station pressure releasing valve |
| CN107030446A (en) * | 2017-04-27 | 2017-08-11 | 上海电力股份有限公司吴泾热电厂 | The online repair system of high temperature and high pressure steam valve sealing face |
| CN107598351A (en) * | 2017-09-13 | 2018-01-19 | 浙江富春江水电设备有限公司 | The cylindrical large area plasma overlaying method of Stellite cobalt-base alloys |
| CN109262129A (en) * | 2018-11-21 | 2019-01-25 | 青岛科技大学 | A kind of electromagnetic induction heater of closed-smelting machine rotor surface overlaying preheating |
| CN111112812A (en) * | 2019-12-30 | 2020-05-08 | 南通市电站阀门有限公司 | Rapid welding method for sealing surface of plasma spray welding valve |
| CN113046744A (en) * | 2021-03-15 | 2021-06-29 | 上海大学 | Method for plasma cladding of WC (wolfram carbide) reinforced nickel-based alloy on surface of copper tube |
| CN113231788A (en) * | 2021-06-03 | 2021-08-10 | 上海电力股份有限公司吴泾热电厂 | On-site repairing method for sealing surface of valve seat of in-service safety valve |
-
2021
- 2021-08-25 CN CN202110980134.4A patent/CN113634953A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101433990A (en) * | 2008-11-19 | 2009-05-20 | 南京宝色股份公司 | Overlaying welding method of large area carbide alloy of workpiece wear layer |
| CN102560476A (en) * | 2011-12-31 | 2012-07-11 | 席生岐 | Induction heating sintering method of metal pipe inner wall coating |
| CN105290564A (en) * | 2015-11-10 | 2016-02-03 | 中广核工程有限公司 | Sealing face surfacing method of nuclear power station pressure releasing valve |
| CN107030446A (en) * | 2017-04-27 | 2017-08-11 | 上海电力股份有限公司吴泾热电厂 | The online repair system of high temperature and high pressure steam valve sealing face |
| CN107598351A (en) * | 2017-09-13 | 2018-01-19 | 浙江富春江水电设备有限公司 | The cylindrical large area plasma overlaying method of Stellite cobalt-base alloys |
| CN109262129A (en) * | 2018-11-21 | 2019-01-25 | 青岛科技大学 | A kind of electromagnetic induction heater of closed-smelting machine rotor surface overlaying preheating |
| CN111112812A (en) * | 2019-12-30 | 2020-05-08 | 南通市电站阀门有限公司 | Rapid welding method for sealing surface of plasma spray welding valve |
| CN113046744A (en) * | 2021-03-15 | 2021-06-29 | 上海大学 | Method for plasma cladding of WC (wolfram carbide) reinforced nickel-based alloy on surface of copper tube |
| CN113231788A (en) * | 2021-06-03 | 2021-08-10 | 上海电力股份有限公司吴泾热电厂 | On-site repairing method for sealing surface of valve seat of in-service safety valve |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114932300A (en) * | 2022-06-21 | 2022-08-23 | 石河子大学 | Plasma surfacing equipment for preventing inner hole cracks from being generated |
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Application publication date: 20211112 |