CN103350195A - Production method for long hole and narrow groove products by investment casting by utilizing poly carbon-type core materials - Google Patents
Production method for long hole and narrow groove products by investment casting by utilizing poly carbon-type core materials Download PDFInfo
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- CN103350195A CN103350195A CN 201310244199 CN201310244199A CN103350195A CN 103350195 A CN103350195 A CN 103350195A CN 201310244199 CN201310244199 CN 201310244199 CN 201310244199 A CN201310244199 A CN 201310244199A CN 103350195 A CN103350195 A CN 103350195A
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Abstract
The invention relates to a production method for long hole and narrow groove products by investment casting by utilizing poly carbon-type core materials. The technical scheme is that, first, poly carbon-type core dies are made, then curing is performed, the pressed poly carbon-type cores are subjected to surface finishing, removing of joint lines and filling ports, wax mould pressing, finishing and assembling, second, shell-making operations are performed, the poly carbon-type cores retain a plurality of air outlets, are coated, dewaxed, and baked, the poly carbon-type cores and the shells are baked fully, synchronous baking of the poly carbon-type cores and the shells can reduce the baking time and discharge the generated gas during baking, and after casting, the castings are cooled to below 300 DEG C and cleaned. The beneficial effects are that, above 90% of fireproof materials can be removed through simple mechanical oscillation, the cores fall off in form of powder, after abrasive blasting, the surfaces are clean and have no residual materials, the production cycle can be shortened greatly, alkali explosion and alkali cooking operations are removed, compared with the prior art, the production cycle is shortened greatly, the shell-making time is shortened by 50%, and the product quality is raised obviously.
Description
Technical field
The present invention relates to a kind of full form casting process, particularly a kind of poly-carbon core material is used for the production method of model casting slotted hole and narrow groove series products.
Background technology
Slotted hole, narrow groove class foundry goods are one of common structures during model casting is produced, and owing to being difficult for coating and stucco in slotted hole, the narrow groove, runout, shrinkage porosite class defective often occur in the hole slot.The present mode that adopts for this series products is cement-dipping method, slotted hole interpolation batten method, shell partial insulation method, ceramic core, air-set mold core method normally.Cement-dipping method can be used for little hole slot series products, uses the paste refractory powder to fill empty, groove behind two layers on shell processed, then is coated with lower one deck after dry a period of time again.Operating time is long, and the operative employee is had higher technical ability requirement, fills unreal meeting and causes the runout defective.Ceramic core method and air-set mold core method to a certain degree are being to have solved this problem.But air-set mold core method requires height to shell process operations worker's processed technical ability, and inconvenient operation, needs the strict drying time of controlling, and prevents the shell spalling that volumetric expansion causes in the air-set mold core material solidification process.The ceramic core method need to adopt the mode of the quick-fried or soda boiling of alkali when removing core, this mode is dangerous large, and efficient is low, and the product runout of making, shrinkage porosite problem still exist.Slotted hole interpolation batten method, shell partial insulation method can only surpass 8 in the aperture, and the groove width ratio is greater than using more than 1.2.
In sum, adopt present technique to make and have several point defects with slotted hole, narrow groove class foundry goods: the one, quality can't guarantee, operative employee's technical ability is had relatively high expectations, the 2nd, shell cycle processed is long, the 3rd, be difficult to clear up or cleaning efficiency low.
Summary of the invention
Purpose of the present invention is exactly in view of the foregoing defects the prior art has, provide a kind of poly-carbon core material to be used for the production method of model casting slotted hole and narrow groove series products, it is simple to operate, when the compacting wax-pattern, place poly-carbon core, rather than when shell processed, place, and the shell time processed significantly shortens, product cleaning after the cast is simple, quick, require low, clear shell convenient, fast to process of producing product, can effectively improve the quality of products, stronger to the product surface quality protection.
Its technical scheme is may further comprise the steps:
At first, make poly-carbon core mold according to shape of product, poly-carbon core material be 80% land plaster+10% cotton fibriia ,+10% Corvic consists of, scaling loss when cotton fibriia, Corvic high-temperature roasting, can improve the gas permeability of poly-carbon core, mold materials generally selects 40Cr steel or T10 steel to do, and can use W360T series material when required precision is high, use injection machine that the poly-carbon core material of liquid state is injected poly-carbon core mold, form poly-carbon core;
Then use plasticiser to be cured, be 2-3H general hardening time, and the poly-carbon core that will suppress after the curing carries out surfacing, removes spue line, sprue, and wax-pattern is organized tree after suppressing and repairing;
Shell operation processed again, poly-carbon core keeps a plurality of exhaust outlets during shell operation processed, the part of poly-carbon core as product is coated with, carry out roasting after the dewaxing, poly-carbon core and shell thorough roasting, sintering temperature 〉=900 ℃, the residual wax of poly-carbon core is burnt, roasting time needs 30-90 minute, the gas that produces when shortening roasting time and fully discharging roasting with one-step baking with shell, cleaning below the air cooling to 300 ℃ after the casting.
In the above-mentioned last step, as not clearing up for a long time after the fruit product casting, generate stronger material because gathering carbon core and air effect, this moment is easy-clear not; Or the product after the casting gets wet and carried out acid corrosion, and the calcified material that poly-carbon core is hard with meeting formation after water and acid contacts is difficult to removing; Should carry out aftertreatment technology in order to remove poly-carbon core: foundry goods is reheated to 900 ℃, be incubated 30-60 minute, get final product by cleaning technology after the casting again.
Above-mentioned plasticiser adopts Corvic.
The invention has the beneficial effects as follows: compare with the air-set mold core with using ceramic core, poly-carbon core can be made the core of complicated shape, slotted hole, deep trouth series products, and cost of manufacture is low, and surface quality is high, can reach Ra1.6, in when cleaning, can remove refractory material more than 90% by mechanical oscillation simply, and core is Powdered and comes off, the sandblast rear surface is clean, the material of noresidue has been saved the production cycle greatly, the quick-fried or soda boiling operation of the alkali of removal.Compare with original technology, the production cycle significantly shortens, shell time shorten processed one times, the quality of product also has obvious lifting, the present invention is compared with the prior art, and significant progress is arranged.
The specific embodiment
At first make poly-carbon core mold according to shape of product, because being generally the plasticizer of 80% land plaster+10% cotton fibriia+10% Corvic, poly-carbon core material consists of, scaling loss when cotton fibriia, Corvic high-temperature roasting can improve the gas permeability of gathering the carbon core.But the fusing point of gypsum is low, and poor fluidity needs to use powerful injection machine, so mold materials generally selects 40Cr steel or T10 steel to do, can use W360T series material when required precision is high.Use injection machine that the poly-carbon core material of liquid state is injected poly-carbon core mold, form poly-carbon core.Then use plasticiser, be cured such as Corvic or other chemical reagent well-known to those skilled in the art, be 2-3H general hardening time.The poly-carbon core that will suppress after the curing carries out surfacing, removes spue line, sprue.Look in use product structure and determine when place, the product structure complexity, need to when pressing wax, put into core, simple products can be placed behind the compacting wax-pattern.The wax-pattern compacting is also repaired (the defectives such as the spue line of removal wax-pattern, oil stripping, flow liner, core and wax spare intersection do not need extra process) after organize tree, group tree will take into full account molten metal to the impact of fuse during with the cast gate design, to reduce the impulsive force of fuse and buoyancy as principle as far as possible.Then be shell operation processed, fuse stays exhaust outlet as much as possible during shell operation processed, the part that poly-carbon core is considered as product normally is coated with, carry out roasting after the dewaxing, fuse and shell must thorough roastings, sintering temperature 〉=900 ℃ could be burnt the residual wax of fuse, and roasting time needs 30-90 minute (quantity and size according to the size of fuse, actual sintering temperature, exhaust outlet decide), with shell with the gas of one-step baking to shorten roasting time and fully to produce during the discharge roasting.Could clear up below the air cooling to 300 ℃ after the casting, fuse is difficult for shaking also having certain plasticity more than 300 ℃.If at room temperature shake, it is very crisp that fuse has become, easily cleaning.
Do not clear up for a long time (more than 5 days) as after the fruit product casting, because fuse and air effect generate stronger material, easy-clear not at this moment.Also having a kind of situation is that product after the casting gets wet and carried out acid corrosion, and the calcified material that fuse is hard with meeting formation after water and acid contacts is difficult to removing.Should carry out aftertreatment technology in order to remove fuse: foundry goods is reheated to 900 ℃, be incubated 30-60 minute (deciding on the foundry goods size), get final product by cleaning technology after the casting again.
Compare with the air-set mold core with using ceramic core, poly-carbon core can be made the core of complicated shape, slotted hole, deep trouth series products, and cost of manufacture is low, surface quality is high, can reach Ra1.6, when cleaning, only need simple shake shell core material can be deviate from fully, do not need other operation.
The present invention is described further below in conjunction with example:
The lockset that uses on a kind of steamer, the dark groove of 12x12x75 is arranged on the product, before not using poly-carbon core, during shell operation processed, need to two layers use afterwards 80% zirconium powder+20% Ludox and zirconium mud block the hole of a side, then in groove, fill zircon sand, tamp and with zirconium mud the opposite side opening is blocked afterwards, be coated with again lower one deck after dry 24 hours.Because zircon sand has been filled in inside, when roasting, sintering temperature need to be increased to 1200 ℃, roasting 90 minutes.By mechanical oscillation and sandblast operation, the refractory material on surface can not be fully clear, need to carry out the quick-fried or soda boiling operation of alkali again, and then sandblast time could be removed residual refractory material.Owing to repeatedly clear up refractory material, cause casting deformation, need to carry out shaping and correct.After using poly-carbon core, when wax-pattern suppress, will gather the carbon core and be placed in the mould, and then suppress wax-pattern, core is combined seamless with wax material, and when shell processed operated, got final product 12 hours every layer of drying times.The product of casting complete can be removed refractory material more than 90% by mechanical oscillation simply, and core is Powdered and comes off, and the sandblast rear surface is clean, and the material of noresidue has been saved the production cycle greatly, the quick-fried or soda boiling operation of the alkali of removal.
The flow process that it is concrete and technological parameter contrast are as shown in the table:
1. do not use flow process and the technological parameter of poly-carbon core material
(1) shell parameter processed
| The number of plies | Slurry viscosity (detection of Zhan Shi 4# cup) | Sand material order number | Drying time (hour) | Humidity (RH) | Temperature (℃) | Wind speed (level) |
| Surface layer | 45±2S | 100-120(zircon sand) | 8 | 65-75 | 25±2 | Calm |
| Two layers | 34±3S | 30-60(does not come sand) | 10 | 55-35 | 25±2 | Gentle breeze |
| Three layers | 34±3S | 30-60(does not come sand) | 18 | 55-35 | 25±2 | Gentle breeze |
| Four layers | 34±3S | 16-30(does not come sand) | 18 | 55-35 | 25±2 | Gentle breeze |
| Five layers | 12±1S | 16-30(does not come sand) | 24 | 55-35 | 25±2 | 7-9m/s |
| Slurry seal | ? | ? | 16 | 55-35 | 25±2 | 7-9m/s |
| Back-up sand | ? | 80-120(zircon sand) | 6 | 55-35 | 25±2 | 7-9m/s |
| Six layers | 12±1S | 16-30(does not come sand) | 12 | 55-35 | 25±2 | 7-9m/s |
| Half storey (slurry seal layer) | 12±1S | ? | 12 | 55-35 | 25±2 | 7-9m/s |
6 days shell time processed, product percent of pass 90%.
(2) roasting and cleaning
Sintering temperature is increased to 1200 ℃, roasting 90 minutes.Then mechanical oscillation and sandblast operation carry out the quick-fried or soda boiling cleaning refractory material of alkali.
2. use the flow process behind the poly-carbon core
(1) shell parameter processed
| The number of plies | Slurry viscosity (detection of Zhan Shi 4# cup) | Sand material order number | Drying time (hour) | Humidity (RH) | Temperature (℃) | Wind speed (level) |
| Surface layer | 45±2S | 100-120(zircon sand) | 6 | 65-75 | 25±2 | Calm |
| Two layers | 34±3S | 30-60(does not come sand) | 8 | 55-35 | 25±2 | Gentle breeze |
| Three layers | 12±1S | 16-30(does not come sand) | 14 | 55-35 | 25±2 | 7-9m/s |
| Four layers | 12±1S | 16-30(does not come sand) | 14 | 55-35 | 25±2 | 7-9m/s |
| Five layers | 12±1S | 16-30(does not come sand) | 12 | 55-35 | 25±2 | 7-9m/s |
| Half storey (slurry seal layer) | 12±1S | ? | 12 | 55-35 | 25±2 | 7-9m/s |
3 days shell time processed, product percent of pass 95%.
(2) roasting and cleaning
Sintering temperature is increased to 1100 ℃, roasting 90 minutes.Mechanical oscillation and sandblast operation can be removed refractory material.
By above-mentioned data as can be known, technique of the present invention is compared with original technology, and the production cycle significantly shortens, shell time shorten processed one times, the quality of product also has obvious lifting, the present invention is compared with the prior art, and significant progress is arranged.
Claims (3)
1. a poly-carbon core material is used for the production method of model casting slotted hole and narrow groove series products, it is characterized in that may further comprise the steps:
At first, make poly-carbon core mold according to shape of product, poly-carbon core material be 80% land plaster+10% cotton fibriia ,+10% Corvic consists of, scaling loss when cotton fibriia, Corvic high-temperature roasting, can improve the gas permeability of poly-carbon core, mold materials generally selects 40Cr steel or T10 steel to do, and can use W360T series material when required precision is high, use injection machine that the poly-carbon core material of liquid state is injected poly-carbon core mold, form poly-carbon core;
Then, use plasticiser to be cured, be 2-3H general hardening time, and the poly-carbon core that will suppress after the curing carries out surfacing, removes spue line, sprue, and wax-pattern is organized tree after suppressing and repairing;
Again, shell operation processed, poly-carbon core keeps a plurality of exhaust outlets during shell operation processed, and the part of poly-carbon core as product is coated with, and carries out roasting after the dewaxing, poly-carbon core and shell thorough roasting, sintering temperature 〉=900 ℃ will be gathered the residual wax of carbon core and be burnt roasting time 30-90 minute, the gas that produces when shortening roasting time and discharging roasting with one-step baking with shell, cleaning below the air cooling to 300 ℃ after the casting.
2. poly-carbon core material according to claim 1 is used for the production method of model casting slotted hole and narrow groove series products, it is characterized in that: in the last step, as not clearing up for a long time after the fruit product casting, generate stronger material because gathering carbon core and air effect, this moment is easy-clear not; Or the product after the casting gets wet and carried out acid corrosion, and the calcified material that poly-carbon core is hard with meeting formation after water and acid contacts is difficult to removing; Should carry out aftertreatment technology in order to remove poly-carbon core: foundry goods is reheated to 900 ℃, be incubated 30-60 minute, get final product by cleaning technology after the casting again.
3. poly-carbon core material according to claim 1 is used for the production method of model casting slotted hole and narrow groove series products, it is characterized in that: described plasticiser adopts Corvic.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201310244199 CN103350195A (en) | 2013-06-20 | 2013-06-20 | Production method for long hole and narrow groove products by investment casting by utilizing poly carbon-type core materials |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201310244199 CN103350195A (en) | 2013-06-20 | 2013-06-20 | Production method for long hole and narrow groove products by investment casting by utilizing poly carbon-type core materials |
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| CN103350195A true CN103350195A (en) | 2013-10-16 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 201310244199 Withdrawn CN103350195A (en) | 2013-06-20 | 2013-06-20 | Production method for long hole and narrow groove products by investment casting by utilizing poly carbon-type core materials |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108145095A (en) * | 2017-12-27 | 2018-06-12 | 安徽应流航源动力科技有限公司 | A kind of process for making shell of complexity deep groove structure precision castings |
| CN111001759A (en) * | 2019-11-11 | 2020-04-14 | 湖州南丰机械制造有限公司 | Shell making method for improving sand removing efficiency of casting |
| CN111299510A (en) * | 2020-03-31 | 2020-06-19 | 中国航发动力股份有限公司 | Preparation method of aluminum alloy casting shell |
-
2013
- 2013-06-20 CN CN 201310244199 patent/CN103350195A/en not_active Withdrawn
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108145095A (en) * | 2017-12-27 | 2018-06-12 | 安徽应流航源动力科技有限公司 | A kind of process for making shell of complexity deep groove structure precision castings |
| CN111001759A (en) * | 2019-11-11 | 2020-04-14 | 湖州南丰机械制造有限公司 | Shell making method for improving sand removing efficiency of casting |
| CN111299510A (en) * | 2020-03-31 | 2020-06-19 | 中国航发动力股份有限公司 | Preparation method of aluminum alloy casting shell |
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Application publication date: 20131016 |