CN104493084A - Manufacturing method of stainless steel valve - Google Patents
Manufacturing method of stainless steel valve Download PDFInfo
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- CN104493084A CN104493084A CN201410665820.2A CN201410665820A CN104493084A CN 104493084 A CN104493084 A CN 104493084A CN 201410665820 A CN201410665820 A CN 201410665820A CN 104493084 A CN104493084 A CN 104493084A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/02—Sand moulds or like moulds for shaped castings
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C3/00—Selection of compositions for coating the surfaces of moulds, cores, or patterns
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/004—Heat treatment of ferrous alloys containing Cr and Ni
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/005—Heat treatment of ferrous alloys containing Mn
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/008—Heat treatment of ferrous alloys containing Si
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/58—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/60—Ferrous alloys, e.g. steel alloys containing lead, selenium, tellurium, or antimony, or more than 0.04% by weight of sulfur
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
- Valve Housings (AREA)
Abstract
The invention relates to a manufacturing method of a stainless steel valve. At least one of the valve seat, valve cover, valve core and valve cap is made of a stainless steel casting process. The process comprises the following steps: (1) preparing a resin sand mould: preparing an inner core and an outer mold from resin sand according to the shape and appearance of the inner hole of a product; (2) coating: coating a high temperature resistant paint on the outer surface of the inner core and the inner surface of the outer mold and drying; (3) pouring: molting steel, injecting the molten steel into a cavity formed by the space between the inner core and the outer mold; (4) opening the mold: cooling, opening the mold and taking out the stainless steel casting; and (5) cleaning the casting and machining to obtain the stainless steel product. By changing the preparation process, the stainless steel material can be used in the preparation of the valves, such as stainless steel stop valve and water valve; the process is simple and practical; and the obtained product has stable quality, does not have leakage due to stress cracks, and is environment-friendly and resistant to corrosion.
Description
Technical field
The present invention relates to valve field, particularly a kind of manufacture method of stainless steel valve.
Background technology
Existing valve, such as stop valve is made up of valve seat, valve gap, spool, valve cap etc.Because valve seat is usually complex-shaped, consider manufacturing cost, the material that general employing ductility is fabulous carries out forge hot, needs the rust-preventing characteristic (being such as applied in air-conditioner outdoor unit) considering stop valve, so existing stop valve generally adopts brass or stainless steel simultaneously.
Stainless Young's modulus is about 2 times of brass, and the power therefore during forging required for brass is much smaller than stainless steel.Contrast from ductility aspect, when about 600 DEG C, brass is much better than stainless steel more than four times.Find in research, greatly, be unfavorable for forging, even if temperature is more than 900 DEG C, ductility increases for stainless steel stress and tissue change, but still not as brass, difficulty of processing is very large.Therefore current most stop valve is still based on brass.
But brass material is generally leaded, do not meet more and more higher environmental requirement, and Forging Technology itself can make brass material harden, stress is concentrated, and tissue changes, and easily produce stress cracking thus cause revealing, and its corrosion resistance is lower than stainless steel.Therefore, how developing a kind of technique can make stainless steel be widely used in stop valve becoming the important directions studied in the industry.
Summary of the invention
For solving the problem, the object of this invention is to provide a kind of manufacture method of stainless steel valve, its technique is simple, handling ease, constant product quality.
The object of the present invention is achieved like this: a kind of manufacture method of stainless steel valve, at least one in its valve seat, valve gap, spool or valve cap adopts stainless steel casting technique to make, and step comprises: (1) resin sand mould processed: prepare inner core and external mold according to the internal via shape of product and face shaping employing resin sand; (2) coating: at interior core outer surface and external mold inner surface coating high-temperature resistant coating, dry; (3) pour into a mould: melting stainless steel, inject the die cavity that between inner core and external mold, space is formed; (4) die sinking: after cooling, stainless cast steel part is taken out in die sinking; (5) casting cleaning, machining, obtain stainless steel finished product.
In described step (1), resin sand is the mixture of high temperature resistant sand and adhesive, and the shape according to inner core and external mold makes mould; Injecting resin sand by penetrating sand technique to dies cavity, to mold heated 180 ~ 400 DEG C, within 3 ~ 60 seconds, making resin sand mould shaping, or, adopt the mode of natural air drying to make resin sand mould shaping; Die sinking, takes out inner core, external mold.
Inner core in described step (1) and external mold are integrated to be made, or, inner core and external mold are that split obtains, by bonding or clamp system, inner core and external mold are fixed into an entirety again, core surface is provided with can conflict for the projection of both relative positions fixing with external mold inner surface, or external mold inner surface is provided with and can conflicts for the projection of both relative positions fixing with core surface, this height of projection is >=0.05mm; At least be equipped with on one of inner core or external mold for the wide exhaust passage of 0.2 ~ 0.3mm of type intracavity gas of overflowing.
External diameter 0.3 ~ the 1.2mm less of the internal diameter of stainless steel finished product of inner core obtained in described step (1), the internal diameter of stainless steel finished product is not less than 3mm; The size of the position that obtained outer mold cavity needs subsequent mechanical to process than stainless steel finished product to should the large 0.3 ~ 1.2mm of the outline at position.
High-temperature resistant coating in described step (2) adopts the water base or alcohol-base paint of resistance to more than 1560 DEG C high temperature; Use baking temperature during water base high-temperature resistant coating to be 200 ~ 400 DEG C, drying time is 20 ~ 60 minutes, or under room temperature air-dry more than 24 hours, uses and can to light during alcohol radical high-temperature resistant coating under the dry or room temperature of sintering air-dry more than 4 hours.
In described step (3), stainless steel is melt into 1560 ~ 1620 DEG C of liquid, and pouring temperature remains on more than 1540 DEG C; In described step (4), die sinking after temperature is down to less than 820 DEG C.
Described stainless composition counts by weight percentage as C < 0.18, Si < 1.5, Mn < 2.0, S < 0.06, P < 0.06, Ni 3.0 ~ 22.0, Cr 16.0 ~ 28.0, Mo 0 ~ 6.0, Ti < 0.8, Cu 3.0 ~ 5.0, and all the other are Fe and inevitable impurity.
Described stainless steel adopts austenite stainless steel or martensitic stainless steel.
The stainless steel body of casting that described stainless steel adopts austenite stainless steel obtained, follow-uply can carry out or not heat-treat; The stainless steel body of casting that described stainless steel adopts martensitic stainless steel obtained, follow-uply should to heat-treat: 1. quench: 950 ~ 1100 DEG C of oil coolings, 2. lonneals: 180 ~ 300 DEG C of oil coolings or air cooling, or, high tempering: 600 ~ 750 air coolings, 3. anneals: 800 ~ 920 slow cooling.
Described stainless steel valve is stainless steel stop valve, water valve.
The present invention is by changing preparation technology, and make stainless steel be able to for the preparation of valve, simple for process, products obtained therefrom steady quality, there will not be the leakage that stress cracking causes, environmental protection and more corrosion-resistant.
Accompanying drawing explanation
Fig. 1 is the flow sheet of valve seat of the present invention;
Fig. 2 is the flow sheet of valve gap of the present invention;
Fig. 3 is the flow sheet of spool of the present invention.
Detailed description of the invention
The present invention is a kind of manufacture method of stainless steel valve, and at least one in its valve seat 1, valve gap 2, spool 3 or valve cap adopts stainless steel casting technique to make.Adopt resin sand to prepare inner core and external mold according to the internal via shape of product and face shaping, inner core and external mold are integrated to be made, or inner core and external mold be that split obtains, then by bond or inner core and external mold are fixed into an entirety by clamp system.The stainless steel valve that preparation method obtains can be stainless steel stop valve, water valve etc.Embodiment 1: the preparation of valve seat 1, as shown in Figure 1.
(1) resin sand mould processed: adopt resin sand to prepare inner core 11 and external mold 12 respectively according to the internal via shape of product and face shaping, wherein external mold 12 is made up of two halves.External mold 14 is arranged to two rows and is often arranged four in the present embodiment, is connected, thus increases work efficiency by running channel 19 and sprue gate are through.Preferably, the external diameter 0.3 ~ 1.2mm less of the internal diameter of stainless steel finished product of obtained inner core 11, the internal diameter of stainless steel valve seat finished product is generally not less than 3mm, therefore all can adopt the mode of inner core.The size of obtained external mold 12 inner chamber in the position needing subsequent mechanical process is than stainless steel finished product to should the large 0.6 ~ 1.2mm of the outline at position, and reserved machining position, does not need the position of following process without the need to reserving.
Resin sand used in the present invention is precoated sand again, is the mixture of high temperature resistant sand and adhesive.During resin sand mould processed, first make mould according to the shape of inner core 11 and external mold 12; Then injecting resin sand by penetrating sand technique to dies cavity, to mold heated 180 ~ 400 DEG C, within 3 ~ 60 seconds, making resin sand mould shaping (hot sand technique), or, adopt the mode of natural drying to make resin sand mould shaping (cold sand technique); Last die sinking, takes out inner core 11 or external mold 12.
Inner core, external mold can design the wide exhaust passage of the 0.2 ~ 0.3mm that has an appointment, overflow for type cavity gas.Core surface is provided with can conflict for the projection of both relative positions fixing with external mold inner surface; Or external mold inner surface is provided with can conflict for the projection of both relative positions fixing with core surface.Preferably, height of projection is >=0.05mm, is at least symmetrical arranged two.
(2) coating: at inner core 11 surface and external mold 12 inner surface coating (leaching, spray or brush) high-temperature resistant coating, dry, obtain coating inner core 11 and external mold 12.The high-temperature resistant coating of the resin sand mould of casting technique adopts the water base or alcohol-base paint of resistance to more than 1560 DEG C high temperature, object improves the refractoriness of resin sand further, can also improve the outward appearance of stainless cast steel part simultaneously, make its any surface finish, improve roughness, reduce pore.Preferably, use baking temperature during water base high-temperature resistant coating to be 200 ~ 400 DEG C, drying time is 20 ~ 60 minutes, or under room temperature air-dry more than 24 hours, uses and can to light during alcohol radical high-temperature resistant coating under the dry or room temperature of sintering air-dry more than 4 hours.
(3) mould is organized: be placed therein by inner core 11 in the external mold 12 of half, second half external mold 12 in recombinant, by bonding or clamp system, inner core 11 and external mold 12 are fixed into an entirety 15, between inner core 11 and external mold 12, space forms die cavity 17, such as, by the die slot of viscose (Instant cement) sealing to half-open two external molds 12, air-dry; Or, adopt the clamp system 16 be made up of bolting element and clamping plate to clamp to half-open two external molds 12, thus form an entirety 15, and prevent the displacement of model in casting process.In the entirety 15 of the present embodiment, eight die cavities 17 are connected with sprue gate 14 is through respectively by running channel 19.
(4) pour into a mould: melting stainless steel, in the entirety 15 that implantation step (3) is assembled into, namely inject the die cavity 17 that between inner core 11 and external mold 12, space is formed.Stainless steel is melt into 1560 ~ 1620 DEG C of liquid, and pouring temperature remains on more than 1540 DEG C, selects thicker at product, large position to inject, namely selects to be communicated with running channel 19 in thicker at product, large position.
(5) die sinking: after cooling, stainless cast steel part 18 is taken out in die sinking.Being down to after below 820 DEG C in temperature can die sinking, is preferably lower than 300 DEG C, prevents the deformation of products caused because die sinking temperature is too high.
(6) casting cleaning.Such as: the foreign matter (as sand, oxide skin etc.) of shot-peening removing remained on surface, cut rising head, polishing makes rising head regular shape, polishing etc.
(7) machining, removes material unnecessary for internal-and external diameter to product required size, tapping, flash removed, cleaning, finally obtains stainless steel finished product valve seat 1.
Above-mentioned stainless composition counts by weight percentage as C < 0.18, Si < 1.5, Mn < 2.0, S < 0.06, P < 0.06, Ni 3.0 ~ 22.0, Cr 16.0 ~ 28.0, Mo 0 ~ 6.0, Ti < 0.8, Cu 3.0 ~ 5.0, and all the other are Fe and inevitable impurity.Stainless steel adopts austenite stainless steel or martensitic stainless steel, is preferably austenite stainless steel, such as SUS304, SUS316, SUS304L or SUS316L etc., considers cost and performance, most preferably SUS304, SUS304L.The present embodiment adopts SUS304.
When the stainless steel body of casting that stainless steel adopts austenite stainless steel obtained, subsequent step can carry out or not heat-treat, and as heat-treated, technique is: 920 ~ 1150 DEG C, rapid cooling (more than 3 times for air natural cooling velocity).Owing to being made by high temperature the carbide in material fully dissolve, form homogeneous austenite one phase structure, then cool rapidly, just can obtain oversaturated homogeneous structure structure, the decay resistance of material is strengthened.After casting complete, cast product can form the stainless steel that austenite structure is main matrix substantially.When the corrosion resistance that product needed is high requires, can heat-treat as required and carry out tissue adjustment, be organized the overwhelming majority to be adjusted to the stainless steel (substantially close is all austenite structure) of the matrix based on austenite structure.
When the stainless steel body of casting that stainless steel adopts martensitic stainless steel obtained, follow-uply should to heat-treat: 1. quench: 950 ~ 1100 DEG C of oil coolings, 2. lonneal: 180 ~ 300 DEG C of oil coolings or air cooling, or, high tempering: 600 ~ 750 air coolings, 3. anneals: 800 ~ 920 slow cooling (for less than 1/2 of air natural cooling velocity).Pouring that rear product organizes due to martensitic stainless steel is not stainless steel tissue, corrosion resistance extreme difference, therefore need consider structural transformation, allows it be formed with martensite to be the stainless steel tissue of matrix.Determine with component mechanical property requirements, high strength then uses lonneal, and low-intensity high tenacity then uses high tempering.Generate martensitic structure by quenching, use different temperatures to obtain the matrix material of varying strength, make it the structure appliance being applicable to varying strength requirement, lonneal product corrosion resistance is more excellent.
Embodiment 2: the preparation of valve gap 2, as shown in Figure 2.
(1) resin sand mould processed: adopt resin sand to prepare inner core 21 and external mold 22 respectively according to the internal via shape of product and face shaping.External diameter 0.3 ~ the 1.2mm less of the internal diameter of stainless steel finished product of obtained inner core 21.The size of obtained external mold 22 inner chamber in the position needing subsequent mechanical process is than stainless steel finished product to should the large 0.6 ~ 1.2mm of the outline at position, and reserved machining position, does not need the position of following process without the need to reserving.Inner core 21, external mold 22 are all arranged to three rows and are often arranged four in the present embodiment, and external mold 22 is connected with sprue gate 27 is through by running channel 25, thus increase work efficiency.
(2) coating step is with embodiment 1.After coating, be positioned in the external mold 22 of correspondence position by each inner core 21, by bonding or clamp system, inner core 21 and external mold 22 be fixed into an entirety 23, between inner core 21 and external mold 22, space forms die cavity 24.In the entirety 23 of the present embodiment, 12 die cavities 24 are connected with sprue gate 27 is through respectively by running channel 25.
(3) pour into a mould: with embodiment 1, melting stainless steel, inject the die cavity 24 that between inner core 21 and external mold 22, space is formed.
(4) die sinking: with embodiment 1, after cooling, stainless cast steel part 26 is taken out in die sinking;
(5) casting cleaning, machining, obtain stainless steel finished product valve gap 2.
Embodiment 3: the preparation of spool 3, as shown in Figure 3.
(1) resin sand mould processed: adopt resin sand to prepare integrated multiple inner core 31 and external mold 32 according to the internal via shape of product and face shaping.External diameter 0.3 ~ the 1.2mm less of the internal diameter of stainless steel finished product of obtained inner core 31.The size of obtained external mold 32 inner chamber in the position needing subsequent mechanical process is than stainless steel finished product to should the large 0.6 ~ 1.2mm of the outline at position, and reserved machining position, does not need the position of following process without the need to reserving.In the present embodiment, inner core 31 is arranged in external mold 32, between inner core 31 and external mold 32, space forms die cavity 33, multiple inner core 31 and external mold 32 form an entirety 39, each overall 39 comprise eight circumferentially equally distributed die cavities 33, each die cavity 33 is connected with sprue 35 is through by cross gate 34, thus increases work efficiency.
(2) coating step is with embodiment 1.After coating, by multiple overall 39 (the present embodiment is four) mounted on top, each sprue 35 is aimed at, be positioned in the sand mold clamping housing 36 of cartridge type, top cover upper cover plate 37 is fixed, and cover plate 37 is provided with cup 38, and sprue 35 is in communication with the outside by cup 38.The bottom surface being positioned at the entirety 39 of top forms the upper capping of the entirety 39 being positioned at below.
(3) pour into a mould: with embodiment 1, melting stainless steel, inject the die cavity 33 that between inner core 31 and external mold 32, space is formed.
(4) die sinking: with embodiment 1, after cooling, stainless cast steel part 3 ' is taken out in die sinking;
(5) casting cleaning, machining, obtain stainless steel finished product spool 3.
Claims (10)
1. a manufacture method for stainless steel valve, at least one in its valve seat, valve gap, spool or valve cap adopts stainless steel casting technique to make, and step comprises:
(1) resin sand mould processed: adopt resin sand to prepare inner core and external mold according to the internal via shape of product and face shaping;
(2) coating: at interior core outer surface and external mold inner surface coating high-temperature resistant coating, dry;
(3) pour into a mould: melting stainless steel, inject the die cavity that between inner core and external mold, space is formed;
(4) die sinking: after cooling, stainless cast steel part is taken out in die sinking;
(5) casting cleaning, machining, obtain stainless steel finished product.
2. the manufacture method of a kind of stainless steel valve according to claim 1, is characterized in that: in described step (1), and resin sand is the mixture of high temperature resistant sand and adhesive, and the shape according to inner core and external mold makes mould; Injecting resin sand by penetrating sand technique to dies cavity, to mold heated 180 ~ 400 DEG C, within 3 ~ 60 seconds, making resin sand mould shaping, or, adopt the mode of natural air drying to make resin sand mould shaping; Die sinking, takes out inner core, external mold.
3. the manufacture method of a kind of stainless steel valve according to claim 1, it is characterized in that: the inner core in described step (1) and external mold are integrated to be made, or, inner core and external mold are that split obtains, by bonding or clamp system, inner core and external mold are fixed into an entirety again, core surface is provided with can conflict for the projection of both relative positions fixing with external mold inner surface, or external mold inner surface is provided with and can conflicts for the projection of both relative positions fixing with core surface, this height of projection is >=0.05mm; At least be equipped with on one of inner core or external mold for the wide exhaust passage of 0.2 ~ 0.3mm of type intracavity gas of overflowing.
4. the manufacture method of a kind of stainless steel valve according to claim 1, is characterized in that: the external diameter 0.3 ~ 1.2mm less of the internal diameter of stainless steel finished product of inner core obtained in described step (1), and the internal diameter of stainless steel finished product is not less than 3mm; The size of the position that obtained outer mold cavity needs subsequent mechanical to process than stainless steel finished product to should the large 0.3 ~ 1.2mm of the outline at position.
5. the manufacture method of a kind of stainless steel valve according to claim 1, is characterized in that: the high-temperature resistant coating in described step (2) adopts the water base or alcohol-base paint of resistance to more than 1560 DEG C high temperature; Use baking temperature during water base high-temperature resistant coating to be 200 ~ 400 DEG C, drying time is 20 ~ 60 minutes, or under room temperature air-dry more than 24 hours, uses and can to light during alcohol radical high-temperature resistant coating under the dry or room temperature of sintering air-dry more than 4 hours.
6. the manufacture method of a kind of stainless steel valve according to claim 1, is characterized in that: in described step (3), and stainless steel is melt into 1560 ~ 1620 DEG C of liquid, and pouring temperature remains on more than 1540 DEG C; In described step (4), die sinking after temperature is down to less than 820 DEG C.
7. the manufacture method of a kind of stainless steel valve according to claim 1, it is characterized in that: described stainless composition counts by weight percentage as C < 0.18, Si < 1.5, Mn < 2.0, S < 0.06, P < 0.06, Ni 3.0 ~ 22.0, Cr 16.0 ~ 28.0, Mo 0 ~ 6.0, Ti < 0.8, Cu 3.0 ~ 5.0, all the other are Fe and inevitable impurity.
8. the manufacture method of a kind of stainless steel valve according to claim 1, is characterized in that: described stainless steel adopts austenite stainless steel or martensitic stainless steel.
9. the manufacture method of a kind of stainless steel valve according to claim 8, is characterized in that: the stainless steel body of casting that described stainless steel adopts austenite stainless steel obtained, follow-uply can carry out or not heat-treat; The stainless steel body of casting that described stainless steel adopts martensitic stainless steel obtained, follow-uply should to heat-treat: 1. quench: 950 ~ 1100 DEG C of oil coolings, 2. lonneals: 180 ~ 300 DEG C of oil coolings or air cooling, or, high tempering: 600 ~ 750 air coolings, 3. anneals: 800 ~ 920 slow cooling.
10. the stainless steel valve that the manufacture method described in claim 1-9 is obtained is stainless steel stop valve, water valve.
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| CN201410665820.2A CN104493084B (en) | 2014-11-20 | 2014-11-20 | A kind of manufacturing method of stainless steel valve and stainless steel valve obtained |
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| CN201410665820.2A CN104493084B (en) | 2014-11-20 | 2014-11-20 | A kind of manufacturing method of stainless steel valve and stainless steel valve obtained |
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| CN104493084A true CN104493084A (en) | 2015-04-08 |
| CN104493084B CN104493084B (en) | 2018-07-27 |
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| CN105821345A (en) * | 2016-05-07 | 2016-08-03 | 惠安县泰达商贸有限责任公司 | Alloy material for valve of airplane washroom |
| CN105886992A (en) * | 2016-04-27 | 2016-08-24 | 广东中烟工业有限责任公司 | Repairing method for worn cut tobacco impregnator |
| CN107043885A (en) * | 2017-04-28 | 2017-08-15 | 张家港振江粉末冶金制品有限公司 | A kind of manufacture method of immediate action valve valve element |
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| CN110918884A (en) * | 2019-12-24 | 2020-03-27 | 安徽应流集团霍山铸造有限公司 | Preparation method of stainless steel material for improving super austenite |
| CN113426957A (en) * | 2021-07-12 | 2021-09-24 | 安徽海立精密铸造有限公司 | Low-gas-evolution water jacket core structure and core assembling method thereof |
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