CN110181136B - Brazing method for butterfly piece type labyrinth valve cage installation structure - Google Patents
Brazing method for butterfly piece type labyrinth valve cage installation structure Download PDFInfo
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- CN110181136B CN110181136B CN201910571407.2A CN201910571407A CN110181136B CN 110181136 B CN110181136 B CN 110181136B CN 201910571407 A CN201910571407 A CN 201910571407A CN 110181136 B CN110181136 B CN 110181136B
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- butterfly
- temperature
- cage structure
- butterfly sheet
- brazing
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- 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
- B23K1/00—Soldering, e.g. brazing, or unsoldering
- B23K1/0008—Soldering, e.g. brazing, or unsoldering specially adapted for particular articles or work
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- 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
- B23K1/00—Soldering, e.g. brazing, or unsoldering
- B23K1/20—Preliminary treatment of work or areas to be soldered, e.g. in respect of a galvanic coating
Abstract
The invention discloses a brazing method for a butterfly sheet type labyrinth valve cage structure, which comprises the following steps: step 1: firstly, carrying out sand blasting treatment on a butterfly sheet matrix, then carrying out chemical nickel plating, then smearing nano inorganic high-temperature-resistant paint at a runner on the butterfly sheet, filling epoxy resin organic filler and/or paraffin filler into the runner after curing, and troweling the nano inorganic high-temperature-resistant paint to be aligned with the butterfly sheet matrix, smearing the nano inorganic high-temperature-resistant paint on the surface of the epoxy resin organic filler after curing, and finally smearing brazing material on a non-runner area of the butterfly sheet matrix to prepare a pre-sintered butterfly sheet matrix; step 2: and (3) aligning the pre-sintered butterfly substrate substrates prepared in the step (1) layer by layer, stacking the layers together to form a cage structure, fastening the cage structure by using a tool fixture, and sintering the cage structure. The invention reduces the sintering temperature, increases the bonding strength between welding parts and effectively prevents the flow passage opening from being blocked by improving the brazing process.
Description
Technical Field
The invention belongs to the technical field of valves, and particularly relates to a brazing method for a butterfly sheet type labyrinth valve cage structure.
Background
The multi-stage labyrinth pressure reducing valve adopts a labyrinth flow channel regulating valve consisting of a plurality of layers of butterfly sheets, the flow of media flowing through the valve is regulated through the positions of a valve core and a butterfly sheet assembly, the on-way resistance is increased through a small flow channel on the butterfly sheet and frequent bending of the flow channel, the pressure of high-pressure gas or steam is greatly reduced, liquid cannot generate cavitation due to effective multi-stage pressure reduction, and the noise in the pressure reducing process is reduced.
The labyrinth regulating valve is mainly composed of a plurality of butterfly sheets, a plurality of axisymmetrically arranged thin flow passages are arranged on the surface of each butterfly sheet, the flow passages are radially diverged by a central hole, and the surface arrangement of the integral butterfly sheets is very similar to a labyrinth, so the labyrinth regulating valve is called as a labyrinth butterfly valve (for example, shown in fig. 1 and 2). The design of the surface labyrinth of the butterfly sheet can be different according to different medium process parameters and different arrangement of flow channels.
The cage-shaped structure formed by the butterfly sheets can be molded in various manners at present, including the machining molding of a single common butterfly sheet, and then the butterfly sheets are welded together, and the butterfly sheets can be locked together through a guide post, even the cage-shaped structure of 3D printing exists; however, most cage-shaped structures are formed by welding butterfly pieces, the 3D printing cage-shaped structures are less adopted due to very high cost, and the 3D printing cage-shaped structures are believed to be further popularized with the further reduction of the cost of 3D printing equipment and raw materials thereof in the future.
Although the butterfly welding structure is low in cost and excellent enough in performance, the related forming process is not completely mature. Generally, a brazing process is adopted, brazing filler metal is coated on the butterfly pieces, only the brazing filler metal is coated on the upper surfaces of the butterfly pieces, the brazing filler metal is not arranged in a flow channel area, then the butterfly pieces are aligned and stacked together layer by layer to form a cage-shaped structure, the butterfly pieces are fixed through a tool, air-dried naturally, then sent into a vacuum furnace to be sintered, after a certain control temperature and time are reached, the cage-shaped structure and the tool are taken out, the tool is disassembled, and the cage-shaped structure and the tool are cleaned. And then sent for further processing.
The cage-like structure that we now make using the above-mentioned conventional painting and brazing processes presents a number of problems, now described as follows: firstly, the coating smeared on the butterfly disc can easily flow into a flow channel due to the siphonage phenomenon in the high-temperature sintering process, and finally, part of flow channel openings are blocked, and if more than a certain number of flow channel openings are blocked or partially blocked, the product is scrapped. There is also a case where the brazing property of the brazing material and the tab substrate is poor, resulting in an insecure portion of the welded portion and even a detachment of the entire welded portion. The other condition is that in order to enhance the welding firmness, the sintering temperature is increased, and due to the fact that the process temperature is too high, in the vacuum sintering process, due to the fact that a plurality of flow channels are arranged in the middle of the butterfly piece and the butterfly piece is flaky, large thermal stress is generated under the influence of the temperature, and finally the surface of the butterfly piece is bent, so that the butterfly piece cannot be strictly sealed, and the product is unqualified.
Disclosure of Invention
The invention provides a brazing method for a butterfly sheet type labyrinth valve cage structure, which aims to overcome the defects in the prior art.
The technical scheme adopted by the invention is as follows: a brazing method for a butterfly sheet type labyrinth valve cage structure comprises the following steps:
step 1: firstly, carrying out sand blasting treatment on a butterfly sheet matrix, then carrying out chemical nickel plating, then coating a nano inorganic high-temperature-resistant coating on a flow channel on the butterfly sheet, filling an epoxy resin organic filler into the flow channel after curing, leveling the flow channel until the flow channel is aligned with the butterfly sheet matrix, coating the nano inorganic high-temperature-resistant coating on the surface of the epoxy resin organic filler after curing, and finally coating a brazing material on a non-flow channel area of the butterfly sheet matrix to prepare a pre-sintered butterfly sheet matrix;
step 2: aligning the pre-sintered butterfly substrate substrates prepared in the step 1 layer by layer, stacking the pre-sintered butterfly substrate substrates together to form a cage structure, fastening the cage structure by using a tool fixture, and sintering the cage structure; the sintering temperature is preferably 650 ℃ to 950 DEG C
Further, the chemical nickel plating is low-phosphorus chemical nickel plating (generally, the phosphorus content is less than 3.6 wt%); and/or the nano inorganic high-temperature resistant coating is an inorganic coating mainly comprising nano silicon dioxide. The chemical nickel plating mode with low phosphorus is selected as much as possible, so that the surface hardness is reduced, the purity of the nickel surface is high, and the infiltration performance of the brazing filler metal is facilitated. The nano inorganic high-temperature resistant coating is an inorganic coating mainly containing nano silicon dioxide (namely the content of the nano silicon dioxide in the nano inorganic high-temperature resistant coating is more than 85 wt%), can be cured at normal temperature, and can form a high-temperature resistant isolation film at high temperature to generate a strong isolation layer. Further, the film forming thickness of the nano inorganic high-temperature resistant coating is 10-20 microns; and/or the thickness of a coating film formed by the chemical nickel plating is 5-10 microns; and/or the coating thickness of the brazing material is 20-30 microns.
In the sintering process, the epoxy resin organic filler begins to volatilize at about 200 ℃, and is dispersed from the inner hole 3 of the butterfly sheet runner port and the excircle end face thereof. The resin filling material in the runner port is beneficial to generating a solid structure, so that the brazing filler metal is prevented from entering the runner, pressure is generated when the brazing filler metal is volatilized at about 200 ℃, the brazing filler metal is blocked, and the brazing filler metal is isolated outside the runner 2 on the butterfly sheet by a closing body formed by the nano inorganic high-temperature-resistant coating. At the moment, the sintering temperature is continuously increased to about 800 ℃, the brazing filler metal begins to melt, and at the moment, the nano inorganic high-temperature-resistant coating still exists all the time, so that the brazing filler metal cannot enter the runner opening all the time.
The technical effects obtained by the invention are as follows: (1) the nano inorganic high-temperature-resistant coating film has high-temperature-resistant property and film forming capability, plays a role in blocking after the brazing flux is melted, and prevents the brazing flux from flowing into a flow channel; (2) the epoxy resin filling material in the flow channel is beneficial to generating a solid structure and preventing brazing filler metal from entering the flow channel; (3) the nano inorganic high-temperature resistant coating is smeared on the epoxy resin organic filler, the nano inorganic high-temperature resistant coating and the previous nano inorganic high-temperature resistant coating form a glue coating, and the epoxy resin organic filler is completely sealed in a nano inorganic high-temperature resistant coating film; (4) the epoxy resin filling material in the flow channel generates pressure when volatilizing at about 200 ℃, so that the sealing of the brazing filler metal is enhanced; (5) the nickel plating film is plated on the surface of the butterfly sheet, so that the infiltration performance of the butterfly sheet and a brazing material is improved, the adhesion force of brazing is improved, selectable brazing types are increased, and the brazing temperature is reduced; (6) the nickel plating film on the surface of the butterfly sheet increases the selectable brazing types, reduces the brazing temperature, reduces the thermal stress and reduces the deformation. The invention reduces the sintering temperature, increases the bonding strength between welding parts and effectively prevents the flow passage opening from being blocked by improving the brazing process.
Drawings
The invention is further illustrated with reference to the following figures and examples.
Fig. 1 is a schematic diagram of a labyrinth valve cage structure composed of multiple layers of butterfly sheets in the background art.
Fig. 2 is a left side view of fig. 1.
In the figure: 1. the butterfly piece base body, 2, the runner on the butterfly piece, 3, the butterfly piece hole.
Detailed Description
The present invention will now be described in further detail with reference to the accompanying drawings.
The disc substrate 1 (the substrate material of the disc is generally 316 stainless steel or other alloy steel, 316 stainless steel is selected in this embodiment) is first subjected to sand blasting, which helps to increase the welding surface area. And secondly, carrying out chemical nickel plating treatment on the surface of the butterfly sheet matrix 1, wherein the thickness of a plated film is 10 microns. The chemical nickel plating mode with low phosphorus is selected as much as possible, so that the surface hardness is reduced, the purity of the nickel surface is high, and the infiltration performance of the brazing filler metal is facilitated. The wettability of the butterfly piece base body 1 and the brazing filler metal can be improved through chemical nickel plating, the brazing area can be completely infiltrated, the adhesive force is increased, various brazing filler metals mainly including silver and copper brazing filler metals have a better brazing effect with the nickel-plated modified surface, and meanwhile, when the brazing filler metals are selected, more selection spaces exist, low-temperature brazing filler metals can be selected, the brazing temperature is greatly reduced, and the butterfly piece is prevented from being deformed due to high temperature and large thermal stress, so that the butterfly piece base body 1 is prevented from being deformed. After chemical nickel plating, a nano inorganic high-temperature resistant coating is coated on the flow channel 2 on the butterfly sheet, the coating is an inorganic coating mainly based on nano silicon dioxide, the film forming thickness is about 10 micrometers, the coating can be cured at normal temperature, a high-temperature resistant isolation film is formed at high temperature, and a strong isolation layer is generated. As the coating film and the nano coating are both 10 microns, the flow characteristics of the flow channel 2 on the butterfly sheet are not affected. The nano inorganic high-temperature resistant coating can be cured within half an hour at normal temperature, and epoxy resin organic filler is filled into the flow channel 2 on the butterfly sheet after curing and is leveled to the upper surface, the lower surface, the inner side and the outer side of the butterfly sheet matrix 1). After curing, the nano inorganic high-temperature resistant coating is smeared on the epoxy resin organic filler, the coating and the previous coating form a glue coating, and the epoxy resin organic filler is completely sealed in the nano inorganic high-temperature resistant coating film. And finally, coating brazing materials on the non-flow channel area of the butterfly sheet base body 1, wherein the thickness of the brazing materials is about 20 micrometers, aligning the butterfly sheet base bodies 1 layer by layer, stacking the butterfly sheet base bodies together to form a cage-shaped structure, clamping the cage-shaped structure by using a fixture, and preparing for sintering.
In the sintering process, the temperature is firstly preheated to the sintering temperature, the preheating mode is that the temperature is linearly increased from 200 ℃ to 500 ℃, then the sintering temperature is controlled to be 500-950 ℃, and the sintering time is 30-120 minutes. The sintering temperature and the sintering time can be determined according to different sizes of parts, products with the size of less than DN50 being below 650 ℃, products with the size of more than DN50 being about 700 ℃ and the thickness being less than 4mm can be adopted, the time is less than 50 minutes and more than 4mm, and the time is increased. And after sintering, naturally cooling along with the furnace.
The epoxy resin organic filler begins to volatilize at about 200 ℃, and is diffused out of the inner hole 3 of the butterfly sheet runner port and the excircle end surface thereof, as shown by a small window shown in a cage-shaped structure of figure 1. The resin filling material in the flow channel is helpful for generating a solid structure, so that the brazing filler metal is prevented from entering the flow channel, pressure is generated when the brazing filler metal is volatilized at about 200 ℃, the brazing filler metal is blocked, and the brazing filler metal is isolated outside the flow channel 2 on the butterfly sheet by the closing body formed by the nano inorganic high-temperature-resistant coating. At the moment, the sintering temperature is continuously increased to about 800 ℃, the brazing filler metal begins to melt, and at the moment, the nano inorganic high-temperature-resistant coating still exists all the time, so that the brazing filler metal cannot enter a runner opening all the time.
The chemical nickel plating technology in this embodiment is a common technology in the market, that is, a chemical plating solution mainly containing nickel sulfate, sodium citrate, sodium hypophosphite, sodium acetate, etc. is used for chemical plating at an operating temperature of 80 to 90 ℃, and the reaction time is based on the thickness of the plating layer. The nano inorganic high temperature resistant coating adopts GN-205A-A nano coating produced by Guangzhou Yinan New materials science and technology limited, and the welding flux adopts HJAg-X high-quality silver-containing soldering paste produced by Hunan New optical ring science and technology development limited. The filler can also adopt the common melting wax on the market.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and their concepts should be equivalent or changed within the technical scope of the present invention.
Claims (4)
1. A brazing method for a butterfly sheet type labyrinth valve cage structure is characterized by comprising the following steps: the method comprises the following steps:
step 1: firstly, carrying out sand blasting treatment on a butterfly sheet matrix (1), then carrying out chemical nickel plating, then smearing nano inorganic high-temperature-resistant paint on a flow channel (2) on the butterfly sheet, filling epoxy resin organic filler and/or paraffin filler into the flow channel (2) after curing, and leveling to align with the butterfly sheet matrix (1), smearing the nano inorganic high-temperature-resistant paint on the surface of the epoxy resin organic filler and/or paraffin filler after curing, and finally smearing brazing material on a non-flow channel area of the butterfly sheet matrix (1) to prepare a pre-sintered butterfly sheet matrix;
step 2: aligning the pre-sintered butterfly substrate substrates prepared in the step 1 layer by layer, stacking the pre-sintered butterfly substrate substrates together to form a cage structure, clamping the cage structure by using a tool fixture, and sintering the cage structure;
in the sintering process, the epoxy resin organic filler and/or the paraffin filler are heated and volatilized, and the nano inorganic high-temperature-resistant coating forms a high-temperature-resistant isolation film.
2. The brazing method for the butterfly labyrinth valve cage structure according to claim 1, characterized in that: the chemical nickel plating is low-phosphorus chemical nickel plating; and/or the content of the nano silicon dioxide in the nano inorganic high-temperature resistant coating is more than 85 wt%.
3. The brazing method for the butterfly labyrinth valve cage structure according to claim 1, characterized in that: the film forming thickness of the nano inorganic high-temperature resistant coating is 10-20 microns; and/or the thickness of a coating film formed by the chemical nickel plating is 5-10 microns; and/or the coating thickness of the brazing material is 20-30 microns.
4. The brazing method for the butterfly labyrinth valve cage structure according to claim 1, characterized in that: the sintering temperature in step 2 is 650 ℃ to 950 ℃.
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| CN201910571407.2A CN110181136B (en) | 2019-06-28 | 2019-06-28 | Brazing method for butterfly piece type labyrinth valve cage installation structure |
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| CN201910571407.2A CN110181136B (en) | 2019-06-28 | 2019-06-28 | Brazing method for butterfly piece type labyrinth valve cage installation structure |
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| CN110181136A CN110181136A (en) | 2019-08-30 |
| CN110181136B true CN110181136B (en) | 2021-08-10 |
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| JPS60121063A (en) * | 1983-12-02 | 1985-06-28 | Tanaka Kikinzoku Kogyo Kk | Production of lead pin with spherical brazing filler metal |
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| CN201779349U (en) * | 2010-08-10 | 2011-03-30 | 上海阀特流体控制阀门有限公司 | Valve cage structure of pneumatic labyrinth adjusting valve |
| CN201779351U (en) * | 2010-08-10 | 2011-03-30 | 上海阀特流体控制阀门有限公司 | Valve cage structure of pneumatic labyrinth type regulating valve |
| CN102728918A (en) * | 2012-06-13 | 2012-10-17 | 陕西渭河煤化工集团有限责任公司 | Method for connecting WC (Wolfram Carbide) valve core with stainless steel valve rod through thermal bonding |
| CN103111701A (en) * | 2013-03-19 | 2013-05-22 | 上海华尔德电站阀门有限公司 | Making method of labyrinth core bag in labyrinth regulating valve |
| CN103817390A (en) * | 2014-02-24 | 2014-05-28 | 贵州天义电器有限责任公司 | Brazing connection technology for contactor assembly |
| CN103831592A (en) * | 2014-03-13 | 2014-06-04 | 沈阳和世泰通用钛业有限公司 | Manufacturing method of full-enclosed sandwich foamed aluminum structure |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20130153064A1 (en) * | 2011-12-15 | 2013-06-20 | Caterpillar Inc. | Brazed assembly and method of forming |
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2019
- 2019-06-28 CN CN201910571407.2A patent/CN110181136B/en active Active
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60121063A (en) * | 1983-12-02 | 1985-06-28 | Tanaka Kikinzoku Kogyo Kk | Production of lead pin with spherical brazing filler metal |
| US6918530B2 (en) * | 2002-01-25 | 2005-07-19 | Ngk Insulators, Ltd. | Bonded member comprising different materials, and production method thereof |
| CN1736653A (en) * | 2004-08-16 | 2006-02-22 | 播磨化成株式会社 | Welding agent for braze, braze method and printing substrate |
| CN101504079A (en) * | 2009-03-07 | 2009-08-12 | 无锡智能自控工程有限公司 | Screw-in forged high pressure air defense small-flow corner valve |
| CN201779349U (en) * | 2010-08-10 | 2011-03-30 | 上海阀特流体控制阀门有限公司 | Valve cage structure of pneumatic labyrinth adjusting valve |
| CN201779351U (en) * | 2010-08-10 | 2011-03-30 | 上海阀特流体控制阀门有限公司 | Valve cage structure of pneumatic labyrinth type regulating valve |
| CN102728918A (en) * | 2012-06-13 | 2012-10-17 | 陕西渭河煤化工集团有限责任公司 | Method for connecting WC (Wolfram Carbide) valve core with stainless steel valve rod through thermal bonding |
| CN103111701A (en) * | 2013-03-19 | 2013-05-22 | 上海华尔德电站阀门有限公司 | Making method of labyrinth core bag in labyrinth regulating valve |
| CN103817390A (en) * | 2014-02-24 | 2014-05-28 | 贵州天义电器有限责任公司 | Brazing connection technology for contactor assembly |
| CN103831592A (en) * | 2014-03-13 | 2014-06-04 | 沈阳和世泰通用钛业有限公司 | Manufacturing method of full-enclosed sandwich foamed aluminum structure |
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