CN104668437A - Molding sand proportioning process used for producing large supercritical steel castings - Google Patents
Molding sand proportioning process used for producing large supercritical steel castings Download PDFInfo
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- CN104668437A CN104668437A CN201310624496.5A CN201310624496A CN104668437A CN 104668437 A CN104668437 A CN 104668437A CN 201310624496 A CN201310624496 A CN 201310624496A CN 104668437 A CN104668437 A CN 104668437A
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- sand
- weight ratio
- phenolic resin
- molding sand
- aldehyde
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C1/00—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds
Abstract
The invention relates to a molding sand proportioning process used for producing large supercritical steel castings. The molding sand proportioning process is characterized in that alkaline phenolic resin sand is adopted as back sand; the weight ratio of alkaline phenolic resin to quartz sand is (1.5-2) to 100; the weight ratio of alkaline phenolic resin to a curing agent is 100 to (20-30); alkaline phenolic resin chromium ore is adopted as facing sand; the weight ratio of alkaline phenolic resin to chromium ore is (1.5-2) to 100; the weight ratio of alkaline phenolic resin to the curing agent is 100 to (15-25). The molding sand process which is high in proportioned mold strength and good in high-temperature deformability and collapsibility and is used for producing large supercritical steel castings is provided by the invention.
Description
Technical field
The present invention relates to a kind of molding sand proportion technique of producing large and super-critical steel-casting, belong to Casting Technology field.
Background technology
At present, the producer of studies in China Development and Production super-critical steel-casting is little, and mainly based on water-glass sand and Furan Resin-Bonded Sand, these two kinds sand deformability is bad, thermal coefficient of expansion is large, cause percent defective high, and not recoverable, have peculiar smell, environmental pollution is large, also has great harm to the healthy of operative employee.Because domestic casting technique is relatively backward, the unstable product quality of production, causes production cost higher, long in time limit.
Summary of the invention
The object of the invention is the defect overcoming prior art existence, the technique of the molding sand of the production large and super-critical steel-casting that a kind of proportioning mould strength is high, hot deformability, collapsibility are good is provided.
The technical solution adopted for the present invention to solve the technical problems is: a kind of molding sand proportion technique of producing large and super-critical steel-casting, its floor sand adopts alkalescent phenol resin sand, be Jian Fen aldehyde Shu Zhi ︰ quartz sand=(1.5 ~ 2) ︰ 100, Jian Fen aldehyde Shu Zhi ︰ curing agent=100 ︰ (20 ~ 30) by weight ratio; Facing sand adopts alkalescent phenol resin chrome ore, is Jian Fen aldehyde Shu Zhi ︰ chrome ore=(1.5 ~ 2) ︰ 100, Jian Fen aldehyde Shu Zhi ︰ curing agent=100 ︰ (15 ~ 25) by weight ratio.
Beneficial effect of the present invention: (one) raw material: not containing N, P, S in alkalescent phenol resin sand technique binding agent, burn under resin high temperature, sand mold deformability is high, and foundry goods is not easy cracking, require low to roughing sand acid consumption figures, adaptability is good, substantially improves casting technique condition, (2) product quality: steel-casting dimensional accuracy is high, exterior contour is clear, cast(ing) surface is bright and clean, external mass is good, dense structure, foundry goods integrated quality is high, surface roughness can be made to improve 30 ~ 60um by alkalescent phenol resin sand technique, reduce the latent defect (pore of foundry goods, shrinkage porosite, shrinkage cavity) and face crack, Casting tolerance grade MT can be made to bring up to 12-14 level, greatly reduce the hot cracking tendency of foundry goods, this is mainly because resin sand has good mobility, suitable consolidation, demould time is adjustable, hardening strength is high, indeformable in carrying thereafter and mould assembling process, simultaneously because the rigidity of resin sand is high, essentially no type wall offset phenomena in cast and process of setting, so the dimensional accuracy of foundry goods is high, and yield rate is high, (3) working environment is improved: this kind of resin sand eliminates stoving process, the easy consolidation of molding sand, efficiency is high, and collapsibility is cleaning with great difficulty, free from extraneous odour, on environment and people without impact, considerably reducing the labour intensity of workman, improve operating environment, creating condition for enhancing productivity, and can regenerate, be conducive to environmental protection.
Detailed description of the invention
A kind of molding sand proportion technique of producing large and super-critical steel-casting:
1) its floor sand adopts alkalescent phenol resin sand, is that Jian Fen aldehyde Shu Zhi ︰ is than quartz sand=(1.5 ~ 2) ︰ 100, Jian Fen aldehyde Shu Zhi ︰ curing agent=100 ︰ (20 ~ 30), quartz sand is 30/50 order or 40/70 order natural siliceous sand, and it is containing SiO by weight ratio
2>=97%(weight).Alkalescent phenol resin sand preparation method: first put into quartz sand and curing agent in continuous resin puddle mixer, mixed grind added alkalescent phenol resin after 2 ~ 4 minutes, continued mixed grind and unloaded sand after 1 ~ 2 minute, moulding.
2) its facing sand adopts alkalescent phenol resin chrome ore, is that Jian Fen aldehyde Shu Zhi ︰ chrome ore=(1.5 ~ 2) ︰ 100, Jian Fen aldehyde Shu Zhi ︰ curing agent=100 ︰ (15 ~ 25), chrome ore is 40/70 order, and it is containing Cr by weight ratio
2o
3> 44%(weight), refractoriness > 1700 DEG C.Alkalescent phenol resin chrome ore preparation method: first put into chrome ore and curing agent in two stirring batch-type muller, mixed grind added alkalescent phenol resin after 2 ~ 4 minutes, continues mixed grind and unloads sand after 1 ~ 2 minute, moulding.
Described curing agent is viscosity≤150 centipoise 25 DEG C time, preferably: curing agent is viscosity≤100 centipoise 25 DEG C time.
When moulding, at wooden model surface uniform smearing release agent, thickness between 1 ~ 2mm, then according to process stipulation by facing sand and floor sand type.After mould assembling, adopt air-heater to lead to hot blast from cast pipeline, the air outlet temperature of air-heater is between 150 DEG C ~ 200 DEG C, and preferably 180 DEG C, hot blow 4 ~ 8 hours, blowing-out before cast, for dry molding sand.
Our company is by practice, the sand molding adopting above-mentioned formula to prepare produces 34 large-scale stop valve steel-castings of ZG1Cr10MoVWNbN, dimensional accuracy is high, exterior contour is clear, cast(ing) surface is bright and clean, external mass is good, dense structure, foundry goods integrated quality are high, detected by UT, MT nondestructive inspection, qualification rate reaches 100%, produce 22 large-scale stop valve steel-castings of ZG1Cr10MoVWNbN than existing sodium silicate molding, crack 8, yield rate improves 36%.
Large and super-critical steel-casting generally refers to the steel grade used under high temperature, low temperature, high pressure conditions for a long time, and the requirement of its chemical composition is:
ZG1Cr10MoVWNbN belongs to overcritical steel grade, and ZG1Cr10MoVWNbN stop valve is mainly used in thermal power generation unit, 600 DEG C, can reach the normal technical indicator performance used, as following table under the environment such as 20Mpa:
The application of overcritical steel grade on thermal power generation unit can improve coal utilizaton rate greatly, reduces environmental pollution.Current developed country strengthens the research of supercritical unit material, and its manufacture process is very complicated, and quality requirement is quite harsh, and the internal soundness of steel-casting and presentation quality all will be detected by RT, UT, MT nondestructive inspection, and flaw detection rank reaches Machinery Ministry primary standard.
Should be appreciated that specific embodiment described above only for explaining the present invention, being not intended to limit the present invention.Still be among protection scope of the present invention by spirit institute's apparent change of extending out of the present invention or change.
Claims (1)
1. produce the molding sand proportion technique of large and super-critical steel-casting for one kind, it is characterized in that: its floor sand adopts alkalescent phenol resin sand, be Jian Fen aldehyde Shu Zhi ︰ quartz sand=(1.5 ~ 2) ︰ 100, Jian Fen aldehyde Shu Zhi ︰ curing agent=100 ︰ (20 ~ 30) by weight ratio; Facing sand adopts alkalescent phenol resin chrome ore, is Jian Fen aldehyde Shu Zhi ︰ chrome ore=(1.5 ~ 2) ︰ 100, Jian Fen aldehyde Shu Zhi ︰ curing agent=100 ︰ (15 ~ 25) by weight ratio.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310624496.5A CN104668437A (en) | 2013-11-28 | 2013-11-28 | Molding sand proportioning process used for producing large supercritical steel castings |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310624496.5A CN104668437A (en) | 2013-11-28 | 2013-11-28 | Molding sand proportioning process used for producing large supercritical steel castings |
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| CN104668437A true CN104668437A (en) | 2015-06-03 |
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| CN201310624496.5A Pending CN104668437A (en) | 2013-11-28 | 2013-11-28 | Molding sand proportioning process used for producing large supercritical steel castings |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107891125A (en) * | 2017-11-07 | 2018-04-10 | 江苏久祥汽车电器集团有限公司 | Automotive regulator mold cores manufacture method |
-
2013
- 2013-11-28 CN CN201310624496.5A patent/CN104668437A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107891125A (en) * | 2017-11-07 | 2018-04-10 | 江苏久祥汽车电器集团有限公司 | Automotive regulator mold cores manufacture method |
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| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20150603 |