CN103537630A - Baking process of profile and sand core, made from resin sand, of natural gas power cylinder body - Google Patents
Baking process of profile and sand core, made from resin sand, of natural gas power cylinder body Download PDFInfo
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- CN103537630A CN103537630A CN201310569874.4A CN201310569874A CN103537630A CN 103537630 A CN103537630 A CN 103537630A CN 201310569874 A CN201310569874 A CN 201310569874A CN 103537630 A CN103537630 A CN 103537630A
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Abstract
The invention discloses a baking process of a profile and a sand core, made from resin sand, of a natural gas power cylinder body, aiming at overcoming the casting defects of pores, pin holes and the like of existing baking processes of a profile and a sand core, made from resin sand, of a natural gas power cylinder body. The baking process comprises the steps of putting the profile and the sand core, made from the resin sand, of the natural gas power cylinder body into a drying oven; heating up to 210-230 DEG C, and carrying out heat preservation for 3.5h-4.5h; and adjusting the temperature to 95-105 DEG C, and carrying out heat preservation until mould assembling. The baking process can reduce the water content and the gas displacement of the profile and the sand core, overcomes the casting defects of pores, pin holes and the like of existing resin sand profiles, and improves the casting quality. The baking process not only is suitable for baking of the profile and the sand core, made from the resin sand, of the natural gas power cylinder body, but also is suitable for baking of profiles and sand cores made from other resin.
Description
Technical field
The invention belongs to natural gas power cylinder body technique field, be specifically related to a kind of external type of natural gas power cylinder of resin sand making, the baking process of core.
Background technology
In prior art, the compress mode of natural gas mainly adopts feel relieved steam turbine and centrifugal natural gas compressor of pipeline to compress.
The natural gas compressor of home and abroad is mainly divided into high-speed high-power reciprocating piston compressor and low speed reciprocating compressor at present.Wherein, high-speed high-power reciprocating piston compressor, rotation speed n reaches 1000r/min, power P reaches 6000kW, is mainly used in the defeated supercharging of collection, the gas storage gas injection of natural gas, is natural gas exploration and development, stores requisite equipment.Power cylinder is that natural gas compressor provides the critical piece of power in the process of compressed natural gas, and the quality of power cylinder is directly determining the work efficiency of natural gas compressor.
Current natural gas power cylinder body manufacturing process technology is all to adopt first to implement combined cylinder-block-crankcase unit cast, then carries out mach mode of later stage and produces.Concrete processing step is: first according to the requirement of design drawing, make casting molds; Then adopt the mode of cast iron to pour into a mould; After casting complete, power cylinder body is cleared up; Then carry out inside and outside processing; Effects on surface carries out the following process such as cure process to be processed.
In prior art, also have and adopt resin sand to carry out moulding, the patent of invention that for example application number is 200910116912.4 discloses a kind of casting technique with resin sand manufacturing mold core, carry out in the following order: 1) molten iron is melting, the raw material measuring is dropped in line frequency furnace, and heating makes it to be fused into molten iron; 2) molding sand is sent in drying oven and dried, after oven dry, put into puddle mixer, and phenol resin, curing agent are joined in mulling inorganic agent simultaneously and mixed, curing agent is comprised of phenolic group PIC and triethylamine, the weight of phenol resin is 10-20 times of triethylamine, mixed sand is put into casting pattern machine, carry out molding and core making operation; 3) core after molding and core making is carried out to spray treatment, coating is mainly water based paint, after in dryer, carry out drying and processing.
Application number is that 201010249487.9 patent of invention discloses a kind of new resin sand core-making technology, according to body, specification requirement is design feature, the material design of body is HT250, tensile strength is not less than 250MPa, hardness HB190-HB240, has not allowed pore, pin hole, defects i.e.cracks.After machining cylinder block, 100% carries out resistance to pressure experiment, ne-leakage.Secondly coremaking raw material are selected: natural siliceous sand, amine method resin, curing agent.Then formulating scientific and reasonable core manufacturing craft is: shooting pressure 0.5-0.7Mpa, shooting time 5 seconds, blowing amine pressure is 0.25-0.35MPa, blowing the amine time is 10-12 seconds, cleaning pressure 0.6-0.7MPa, scavenging period is 60-90 seconds, and coremaking flow process is: penetrate sand-blow amine---the core demoulding-coating is dried.
Yet the external type of natural gas power cylinder that existing resin sand is made, the baking process of core exist the casting flaws such as pore, pin hole are many, thereby affect casting quality.
Summary of the invention
The defect that the present invention exists for solving prior art, and a kind of external type of natural gas power cylinder of resin sand making, the baking process of core are provided, solved the external type of natural gas power cylinder, the air tube in core baking process, pin hole casting flaw how that existing resin sand is made.
For solving the problems of the technologies described above, the technical solution adopted in the present invention is:
The external type of natural gas power cylinder that resin sand is made, the baking process of core, is characterized in that, comprises the following steps:
(1) pack the external type of natural gas power cylinder, the core of resin sand, made into drying oven;
(2) temperature is heated to 210 ℃-230 ℃, and is incubated 3.5-4.5 hours;
(3) temperature is adjusted to 95 ℃-105 ℃ and is incubated processing, until mould assembling.
Further, described heating-up temperature is 220 ℃.
Further, described temperature is heated to 210 ℃-230 ℃, and temperature retention time is 4 hours.
Further, described resin sand comprises roughing sand, resin and curing agent.
Further, the weight of described resin is 1.2%-1.5% of roughing sand weight, and the weight of described curing agent is 0.36%-1.05% of roughing sand weight.
Further, the weight of described resin is 1.4% of roughing sand weight, and the weight of described curing agent is 0.5% or 0.7% of roughing sand weight.
Further, described resin is furane resins, and described curing agent is p-methyl benzenesulfonic acid.
Compared with prior art, the present invention has following beneficial effect:
The baking process that the present invention adopts can make the external type of natural gas power cylinder that resin sand makes and core moisture and capacity reduce, and has solved the casting flaw problems such as existing phenolic sand molding pore, pin hole are many, has improved the quality of foundry goods.
Owing to containing moisture, free formaldehyde, furfuryl alcohol etc. in roughing sand, resin and p-methyl benzenesulfonic acid, and use wax wire to carry out exhaust to core when making core.Temperature is made as 210-230 ℃, be incubated 3.5-4.5 hours, be conducive to the volatilization of moisture, free formaldehyde, furfuryl alcohol etc., reduced free formaldehyde and the furfuryl alcohol gas that burning produces under cast high temperature, and the wax wire having added while having guaranteed to beat resin sand core at this temperature fusing, form emptying aperture, play scavenging action.Be adjusted to 95 ℃-105 ℃, while guaranteeing mould assembling, mending swabbing can bone dry, moisture-free again.
Heating-up temperature of the present invention is 220 ℃, can improve further the quality of foundry goods.
Resin sand of the present invention comprises external form and the core of the resin sand making natural gas power cylinder body that roughing sand, resin and curing agent mix, can improve foundry goods appearance and size precision, surface smoothness, and reduced the generation of the casting flaws such as burning into sand, buckle, improve the quality of foundry goods, met the requirement of natural gas power cylinder casting.
The present invention selects p-methyl benzenesulfonic acid as curing agent, after sulfuration, can obtain the xylene monosulfonic acid that acidity is higher, because natural gas power cylinder shape is complicated, wall is thinner, needs stronger ability hardness to guarantee dimensional accuracy.Therefore the resin sand that resin sand of the present invention is mixed by roughing sand, resin and p-methyl benzenesulfonic acid is made external form and core.
The weight of resin of the present invention is 1.4% of roughing sand weight, and the weight of curing agent is 0.5%-0.7% of roughing sand weight.Can further improve the quality of casting.
The specific embodiment
Below in conjunction with embodiment, the invention will be further described, and described embodiment is only the present invention's part embodiment, is not whole embodiment.Embodiment based in the present invention, those of ordinary skill in the art, not making other embodiment used that obtain under creative work prerequisite, belongs to protection scope of the present invention.
The external type of natural gas power cylinder that resin sand of the present invention is made, the baking process of core, comprise the following steps:
(1) pack the external type of natural gas power cylinder, the core of resin sand, made into drying oven;
(2) temperature is heated to 210 ℃-230 ℃, and is incubated 3.5-4.5 hours.
(3) temperature is adjusted to 95 ℃-105 ℃ and is incubated processing, until mould assembling.
Further, heating-up temperature is 220 ℃.
Further, temperature is heated to 210 ℃-230 ℃, and temperature retention time is 4 hours.
The baking process that the present invention adopts can make the external type of natural gas power cylinder that resin sand makes and core moisture and capacity reduce, thereby has solved the casting flaw problems such as existing phenolic sand molding pore, pin hole are many, has improved the quality of foundry goods.
Owing to containing moisture, free formaldehyde, furfuryl alcohol etc. in roughing sand, resin and p-methyl benzenesulfonic acid, and use wax wire to carry out exhaust to core when making core.Temperature is made as 210-230 ℃, is incubated 3.5-4.5 hours, is conducive to the volatilization of moisture, free formaldehyde, furfuryl alcohol etc., has reduced free formaldehyde and the furfuryl alcohol gas that burning produces under cast high temperature, thereby has solved the casting flaw problems such as pore, pin hole are many.And the wax wire having added while having guaranteed to beat resin sand core at this temperature fusing, forms emptying aperture, plays scavenging action.Be adjusted to 95 ℃-105 ℃, while guaranteeing mould assembling, mending swabbing can bone dry, moisture-free again.
Heating-up temperature of the present invention is 220 ℃, can improve further the quality of foundry goods.
Further, resin sand comprises roughing sand, resin and curing agent.
Further, the weight of resin is 1.2%-1.5% of roughing sand weight, and the weight of described curing agent is 0.36%-1.05% of roughing sand weight.
Further, the weight of resin is 1.4% of roughing sand weight, and the weight of described curing agent is 0.5% or 0.7% of roughing sand weight.
Further, described resin is furane resins, and described curing agent is p-methyl benzenesulfonic acid.
The selected resin of the present invention also can adopt the resin of other kinds, and those skilled in the art can understand and understand, and does not repeat them here.
The granularity of roughing sand can be selected by concrete condition reference standard, middle-size and small-size foundry goods for example, and selecting granularity is 40-70 object roughing sand, those skilled in the art can understand and understand, and does not repeat them here.
As the consumption of the p-methyl benzenesulfonic acid of curing agent, can adjust according to weather simultaneously, for example spring, summer, autumn the amount of selecting be 0.5% of roughing sand weight, winter, the amount of selecting was 0.7% of roughing sand weight.
As a kind of preferred mode of the present invention, the weight of resin of the present invention is 1.4% of roughing sand weight, and the weight of curing agent is 0.5% of roughing sand weight, and the weight of curing agent is 0.5% of roughing sand weight.Can further improve the quality of casting.
External form, core that the present invention adopts resin sand to make natural gas power cylinder body specifically comprise the following steps;
(1) according to the roughing sand of aforementioned proportion, resin and curing agent, mix;
(2) Chong sand;
(3) repair type;
(4) swabbing;
Further, the swabbing of making external form described in is twice zirconium English powder of brush.
Further, described in, make the swabbing of core for first brushing one times again tellurium powder after a zirconium English powder.These steps those skilled in the art can understand and understand, and do not repeat them here.
Embodiment mono-
The external type of natural gas power cylinder that the present embodiment resin sand is made, the baking process of core, comprise the following steps, and (1) packs the external type of natural gas power cylinder, the core of resin sand, made into drying oven;
(2) temperature is heated to 210 ℃, and is incubated 4.5 hours;
(3) temperature is adjusted to 95 ℃ and is incubated processing, until mould assembling.
Embodiment bis-
The external type of natural gas power cylinder that the present embodiment resin sand is made, the baking process of core, comprise the following steps, and (1) packs the external type of natural gas power cylinder, the core of resin sand, made into drying oven;
(2) temperature is heated to 230 ℃, and is incubated 3.5 hours;
(3) temperature is adjusted to 105 ℃ and is incubated processing, until mould assembling.
Embodiment tri-
The external type of natural gas power cylinder that the present embodiment resin sand is made, the baking process of core, comprise the following steps, and (1) packs the external type of natural gas power cylinder, the core of resin sand, made into drying oven;
(2) temperature is heated to 220 ℃, and is incubated 4 hours;
(3) temperature is adjusted to 100 ℃ and is incubated processing, until mould assembling.
Embodiment tetra-
The external type of natural gas power cylinder that the present embodiment resin sand is made, the baking process of core, comprise the following steps, and (1) packs the external type of natural gas power cylinder, the core of resin sand, made into drying oven;
(2) temperature is heated to 215 ℃, and is incubated 4.2 hours;
(3) temperature is adjusted to 105 ℃ and is incubated processing, until mould assembling.
Embodiment five
The external type of natural gas power cylinder that the present embodiment resin sand is made, the baking process of core, comprise the following steps, and (1) packs the external type of natural gas power cylinder, the core of resin sand, made into drying oven;
(2) temperature is heated to 219 ℃, and is incubated 4.1 hours;
(3) temperature is adjusted to 97 ℃ and is incubated processing, until mould assembling.
The resin sand of the present embodiment is mixed by roughing sand, resin and curing agent, and the weight of resin is 1.2% of roughing sand weight, and the weight of curing agent is 0.36% of roughing sand weight.
Embodiment six
The external type of natural gas power cylinder that the present embodiment resin sand is made, the baking process of core, comprise the following steps, and (1) packs the external type of natural gas power cylinder, the core of resin sand, made into drying oven;
(2) temperature is heated to 210 ℃, and is incubated 4.5 hours;
(3) temperature is adjusted to 102 ℃ and is incubated processing, until mould assembling.
The resin sand of the present embodiment is mixed by roughing sand, resin and curing agent, and the weight of resin is 1.5% of roughing sand weight, and the weight of curing agent is 1.05% of roughing sand weight.
Embodiment seven
The external type of natural gas power cylinder that the present embodiment resin sand is made, the baking process of core, comprise the following steps, and (1) packs the external type of natural gas power cylinder, the core of resin sand, made into drying oven;
(2) temperature is heated to 220 ℃, and is incubated 4 hours;
(3) temperature is adjusted to 104 ℃ and is incubated processing, until mould assembling.
The resin sand of the present embodiment is mixed by roughing sand, resin and curing agent, and the weight of resin is 1.4% of roughing sand weight, and the weight of curing agent is 0.5% of roughing sand weight.
Embodiment eight
The external type of natural gas power cylinder that the present embodiment resin sand is made, the baking process of core, comprise the following steps, and (1) packs the external type of natural gas power cylinder, the core of resin sand, made into drying oven;
(2) temperature is heated to 230 ℃, and is incubated 3.5 hours;
(3) temperature is adjusted to 101 ℃ and is incubated processing, until mould assembling.
The resin sand of the present embodiment is that 40 object roughing sand, furane resins and p-methyl benzenesulfonic acid mix by granularity, and the weight of furane resins is 1.5% of roughing sand weight, and the weight of p-methyl benzenesulfonic acid is 1.0% of roughing sand weight.
Embodiment nine
The external type of natural gas power cylinder that the present embodiment resin sand is made, the baking process of core, comprise the following steps, and (1) packs the external type of natural gas power cylinder, the core of resin sand, made into drying oven;
(2) temperature is heated to 228 ℃, and is incubated 3.7 hours;
(3) temperature is adjusted to 99 ℃ and is incubated processing, until mould assembling.
The resin sand of the present embodiment is that 70 object roughing sand, furane resins and p-methyl benzenesulfonic acid mix by granularity, and the weight of furane resins is 1.35% of roughing sand weight, and the weight of p-methyl benzenesulfonic acid is 0.8% of roughing sand weight.
Embodiment ten
The external type of natural gas power cylinder that the present embodiment resin sand is made, the baking process of core, comprise the following steps, and (1) packs the external type of natural gas power cylinder, the core of resin sand, made into drying oven;
(2) temperature is heated to 215 ℃, and is incubated 4.4 hours;
(3) temperature is adjusted to 95 ℃ and is incubated processing, until mould assembling.
The resin sand of the present embodiment is that 60 object roughing sand, furane resins and p-methyl benzenesulfonic acid mix by granularity, and the weight of furane resins is 1.42% of roughing sand weight, and the weight of p-methyl benzenesulfonic acid is 0.4% of roughing sand weight.
Baking process of the present invention not only can be applicable to the external type of natural gas power cylinder of resin sand making, the baking process of core, can also be applicable to other external forms of making of resin, the baking of core.Baking process of the present invention can reduce moisture and the capacity of external form, core, has solved the casting flaw problems such as existing phenolic sand molding pore, pin hole are many, has improved the quality of foundry goods.
Claims (7)
1. the external type of natural gas power cylinder that resin sand is made, the baking process of core, is characterized in that, comprises the following steps:
(1) pack the external type of natural gas power cylinder, the core of resin sand, made into drying oven;
(2) temperature is heated to 210 ℃-230 ℃, and is incubated 3.5-4.5 hours;
(3) temperature is adjusted to 95 ℃-105 ℃ and is incubated processing, until mould assembling.
2. the natural gas cylinder body external form that resin sand according to claim 1 is made, the baking process of core, is characterized in that, described heating-up temperature is 220 ℃.
3. the natural gas cylinder body external form that resin sand according to claim 1 is made, the baking process of core, described temperature is heated to 210 ℃-230 ℃, and temperature retention time is 4 hours.
4. the natural gas cylinder body external form of making according to the arbitrary described resin sand of claim 1-3, the baking process of core, described resin sand comprises roughing sand, resin and curing agent.
5. the natural gas cylinder body external form that resin sand according to claim 4 is made, the baking process of core, the weight of described resin is 1.2%-1.5% of roughing sand weight, the weight of described curing agent is 0.36%-1.05% of roughing sand weight.
6. the natural gas cylinder body external form that resin sand according to claim 4 is made, the baking process of core, the weight of described resin is 1.4% of roughing sand weight, the weight of described curing agent is 0.5% or 0.7% of roughing sand weight.
7. the natural gas cylinder body external form that resin sand according to claim 4 is made, the baking process of core, described resin is furane resins, described curing agent is p-methyl benzenesulfonic acid.
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| CN201310569874.4A CN103537630A (en) | 2013-11-13 | 2013-11-13 | Baking process of profile and sand core, made from resin sand, of natural gas power cylinder body |
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| CN201310569874.4A CN103537630A (en) | 2013-11-13 | 2013-11-13 | Baking process of profile and sand core, made from resin sand, of natural gas power cylinder body |
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Application publication date: 20140129 |