CN105499505A - Manufacturing method for precision casting mould - Google Patents
Manufacturing method for precision casting mould Download PDFInfo
- Publication number
- CN105499505A CN105499505A CN201610088591.1A CN201610088591A CN105499505A CN 105499505 A CN105499505 A CN 105499505A CN 201610088591 A CN201610088591 A CN 201610088591A CN 105499505 A CN105499505 A CN 105499505A
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- Prior art keywords
- wax
- pattern
- sand
- coating
- manufacture method
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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
- B22C9/04—Use of lost patterns
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/12—Treating moulds or cores, e.g. drying, hardening
Abstract
The invention discloses a manufacturing method for a precision casting mould. The manufacturing method sequentially comprises the following steps of wax mould pressing; shell making, wherein dip-coating, sanding, hardening and water washing are carried out on a wax mould; dewaxing and roasting; cast moulding. According to the manufacturing method for the precision casting mould, the yield of castings can be effectively increased, casting efficiency is improved in the production process, environment in a workshop can be improved by improving solidification liquid, and the manufacturing method is more environmentally friendly.
Description
Technical field
The present invention relates to a kind of manufacture method adopting lost-wax process to carry out precision casting mold, belong to technology of die manufacturing field.
Background technology
Lost-wax process casting is also known as precision-investment casting, a kind of few technique of cutting or getting final product hot investment casting without the need to cutting, it is applicable to the casting of all kinds, various alloy, and the casting dimension accuracy produced is high, surface smoothness is high, especially for the foundry goods that some are not easily processed, lost-wax process all can be adopted to carry out hot investment casting.
The technical process of lost-wax process hot investment casting is as follows:
First, fusible material is adopted to make meltability model: in lost wax process, mainly adopt wax material to make wax shell.
Then, wax shell applies some layers of refractory material, then spray thereon and fill dry sand, then casting mold is put into roaster through high-temperature roasting, until casting mold is after roasting, wherein casting molten metal, after finally being destroyed by casting mold, therefrom obtains foundry goods.
Adopt this lost-wax process to carry out hot investment casting and possess following advantage:
Because investment-casting has the requirement of high dimensional accuracy and surface smoothness, can reduce mechanical processing process by fusible pattern process, the burr that reduce engine processing produces, thorn limit etc. affect the problem of casting quality; Decrease the machine tool required for machined for this reason, cost-saving; In addition, foundry goods is undertaken shaping by the mode of pouring into a mould melting, and compare the raw material that machined can reduce metalwork, the degree wasted raw material reduces greatly.
At present, lost-wax process carries out the casting that precision casting is widely used in all kinds and various alloy, and occurs following some shortcomings in existing production process:
1. existing consolidation liquid adopts ammonium chloride, easily reacts in the curing process, and generate ammonia, the smell is awful for ammonia, for the healthy impact very large again of workman.In addition, existing coating adopts waterglass mostly, and in the curing process, can chemical reaction be there is in the sodium oxide molybdena in waterglass and ammonium chloride, the sodium chloride generated can be deposited in solidification pond, affect the dissolving of ammonium chloride, the concentration of ammonium chloride is reduced, directly has influence on firm time and the intensity of shell.To such an extent as to the percent defective produced in the shell of gained increases.
2. in order to improve this consolidation liquid, adopted aluminium chloride afterwards, although stopped the generation of ammonia, the cost of aluminium chloride is high, and firm time is longer, and this will cause the whole casting time to increase, and then add manufacturing cost.
3. existing wax processed and solidification process normally adopt compacting wax-pattern, then the wax-pattern suppressed is immersed in the slurries of waterglass, and then take out wax-pattern, wax-pattern sprinkles quartz sand, then the wax-pattern speckling with slurries and quartz sand is immersed in consolidation liquid, wax shell can be obtained.In existing technology, usually just employing waxdip and one-step solidification get product wax shell, and wax shell hardness obtained so not, and easily produces bubble, affects the moulding by casting of successive castings.
4. the yield rate of existing lost-wax process production gained foundry goods is not high, and be usually less than 75%, and can not carry out multiple foundry goods operation simultaneously, efficiency is low, is badly in need of improving.
Summary of the invention
The object of the invention is to: for above-mentioned Problems existing, a kind of manufacture method adopting lost-wax process to carry out precision casting mold is provided, effectively can solve the technical problem that existing lost-wax process casting mould exists, improve casting efficiency and yield rate.
Technical scheme of the present invention is achieved in that a kind of manufacture method of precision casting mold, and it comprises following processing step successively:
The first step, compacting wax-pattern: the wax-pattern suppressed is put into water cooling, sizing, then carry out overlap, the repairing of burr and correction, the wax-pattern surface configuration after correction, physical dimension and prototype face are consistent;
Second step, shell processed: wax-pattern is carried out dip-coating material, stucco, sclerosis, washing process;
First, surface layer process: immersed by wax-pattern in coating, makes paint on wax-pattern, then on wax-pattern, spreads 50-40 object facing sand, and immersed in hardening bath by the wax-pattern sprinkled with facing sand, firm time is 1-5 minute, the wax-pattern washing after being hardened by surface layer;
Then, transition zone process: the wax-pattern through surface layer process is immersed in coating, makes paint on wax-pattern, then on wax-pattern, spread 40-20 object transition sand, immersed in hardening bath by wax-pattern sprinkled with transition sand, firm time is 10-20 minute, the wax-pattern washing after finally being hardened by transition zone;
Finally, back-up coat process: the wax-pattern through transition zone process is immersed in coating, makes paint on wax-pattern, then on wax-pattern, spread 10 objects reinforce sand, immerse sprinkled with the wax-pattern reinforcing sand in hardening bath, firm time is 30-40 minute, the wax-pattern washing after finally being hardened by back-up coat; Repeat 1-5 back-up coat process;
Wherein: hardening bath selects concentration to be greater than the calcium chloride of 25%; The price of calcium chloride is lower relative to aluminium chloride, and hardening time is shorter, and calcium chloride, relative to ammonium chloride environmental protection more, does not produce ammonia, free from extraneous odour.In addition, firm time not section lengthens, and to reach adequately hardened requirement, makes the hardness that shell can reach required.
3rd step, dewaxing, roasting: the formwork formed through the process of second step shell is put into dewaxing groove and carry out preliminary dewaxing treatment, and then wax-pattern is put into continuous tunnel furnace, dewax further, form die cavity;
4th step, cast molding: molten steel of casting in die cavity, after foundry goods is shaping, destroy the die cavity of casting exterior, takes off that foundry goods carries out polishing, ball blast, after heat treatment, obtains casting finished products.
As preferably, the manufacture method of precision casting mold of the present invention, in second step, the concentration of calcium chloride is 25%-50%.
As preferably, the manufacture method of precision casting mold of the present invention, in second step, the mixed liquor of coating selection waterglass coating, fecula and n-octyl alcohol.In coating, adding the effect that n-octyl alcohol can play froth breaking, reducing coating affects foundry goods surface smoothness because producing bubble.
As preferably, several wax-pattern interval is fixed on one and waters on rod, form one group of module, in units of module, carry out shell processed, dewaxing, roasting and cast molding.By the mode of combination, multiple wax-pattern can be processed simultaneously, improve working (machining) efficiency.
As preferably, the manufacture method of precision casting mold of the present invention, during dip-coating material, module rotates and moves up and down in paint can, then mentions module, left and right, rotates module up and down, and unnecessary coating is dripped, and the coating on module is even.Coating applies uniformly, and simultaneously unnecessary coating can also reclaim in time, plays the effect saved production cost.
As preferably, the manufacture method of precision casting mold of the present invention, in second step, facing sand material is quartz sand, and transition sand material is quartz sand or bastard coal sand, and the material of back-up coat is used recovery sand in bastard coal sand or sand process processed.Sand reclaims and uses, and can lower the cost of use, and the coating of multilayer sand can strengthen the intensity of whole shell.
As preferably, the manufacture method of precision casting mold of the present invention, suppresses the technological parameter of wax-pattern: pressure injection temperature: 55-65 degree described in it; Dwell time: 10-20 second; Pressure Casting: 0.2-0.5Mpa.
As preferably, the manufacture method of precision casting mold of the present invention, in roasting process described in it, formwork puts into continuous tunnel furnace, in continuous tunnel furnace, add natural gas, and through preheating, low-temperature bake, then high-temperature roasting is to 800-900 degree, comes out of the stove.
Compared with existing casting mould manufacture method, beneficial effect of the present invention: the manufacture method of precision casting mold of the present invention effectively can improve the yield rate of foundry goods, improve casting efficiency in process of production, the environmental problem of workshop can be improved by improving consolidation liquid, environmental protection more simultaneously.
Detailed description of the invention
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with embodiment, the technology of the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
Embodiment 1: for a kind of auto parts and components, for processing obtains these auto parts and components that dimensional accuracy is high, surface smoothness is high, adopts following processing method:
The first step, compacting wax-pattern.
In order to increase make efficiency, the mode of employing group mould is carried out, and several wax-pattern interval is fixed on one and waters on rod, become string-like, form one group of module, the shell processed of multiple wax-pattern, dewaxing, roasting and cast molding can be carried out simultaneously in units of module, improve working (machining) efficiency.
Adopt molding press to carry out compacting wax-pattern, its technological parameter is: pressure injection temperature: 55-65 degree; Dwell time: molten mould is shaping under stress and solidify a period of time under pressure, till this pressure effect is continued until that the dwell time terminates or casting mouth closes because mould material solidifies completely, the size according to wax-pattern is selected, and is generally 10-20 second; Pressure Casting: 0.2-0.5Mpa.
The wax-pattern suppressed is put into water cooling, sizing, then carry out overlap, the repairing of burr and correction, the wax-pattern surface configuration after correction, physical dimension and prototype face are consistent; To produced wax-pattern, 100% must to check, require indeformable, surface do not have bulging, contracting filling, misrun, hole, scuffing, rough surface, corner angle are unclear, the wax that do not have drips, wax bits or other booties are attached on wax-pattern.To defectiveness but can repair restore wax-pattern must repair qualified after, just can proceed to subsequent processing.
Second step, wax-pattern is carried out dip-coating material, stucco, sclerosis, washing process, carry out shell processed.
First, surface layer process: immersed by wax-pattern in coating, makes paint on wax-pattern, then on wax-pattern, spread 50-40 object facing sand, facing sand material is quartz sand, immerses in hardening bath by the wax-pattern sprinkled with facing sand, firm time is 1-5 minute, the wax-pattern washing after being hardened by surface layer.Then, transition zone process: the wax-pattern through surface layer process is immersed in coating, make paint on wax-pattern, then on wax-pattern, spread 40-20 object transition sand, transition sand material is quartz sand or bastard coal sand, immersed in hardening bath by wax-pattern sprinkled with transition sand, firm time is 10-20 minute, the wax-pattern washing after finally being hardened by transition zone.Finally, back-up coat process: immersed in coating by the wax-pattern through transition zone process, make paint on wax-pattern, then spreads 10 objects and reinforces sand on wax-pattern, and the material of back-up coat is used recovery sand in bastard coal sand or sand process processed.Immerse sprinkled with the wax-pattern reinforcing sand in hardening bath, firm time is 30-40 minute, the wax-pattern washing after finally being hardened by back-up coat; Repeat 1-5 back-up coat process.
Wherein: the mixed liquor of coating selection waterglass coating, fecula and n-octyl alcohol, mixed proportion is: waterglass coating: fecula: n-octyl alcohol=8:3:1.First should check before dip-coating material whether module dries, with or without rosin joint, crack, stick to module surface etc., if any doing over again without wax bits.Module immerses investment precoat bucket, until module filling is complete cross module surface after, mention to drip and remove coating, check there is bubble-free simultaneously, the situation that shows money or valuables one carries unintentionally exists, and as existed, must blow, be disposed and soak coating again with on writing brush type brush or with air gun.Module rotates and moves up and down in paint can, then mentions module, and left and right, up and down rotary motion module, make unnecessary coating drip, and coating is even everywhere, prevents local accumulation and blank without coating.As hole, wedge angle, groove etc. not easily immerse coating place, brush it with writing brush.Coating must not dip-coating to the upper surface of cup, when preventing stucco, sand is stained with, for subsequent handling brings difficulty in cup upper surface.
In addition, in rotation, module carries out stucco.Should grasp the stucco time after coating, stucco is too early, and coating is still in flowing, and easily produce accumulation, sand also not easily sprinkles even, spends evening and not easily sprinkles sand, sprinkle and also adhere to loosely, easily peel off and layering.Module should be made during stucco constantly to rotate, make stucco even, prevent floating sand wash and leak stucco.
After investment precoat stucco, module must immerse in hardening bath completely, and ensure that module is immersed in liquid level completely, the calcium chloride of concentration 28% selected by hardening bath; Hardening temperature is normal temperature.Because module comparatively gently often floats on the face of hardening bath when surface layer, transition zone, must stir module in good time, make it fully harden, module goes out pond and should prevent hardening bath from falling outside sclerosis pond.
3rd step, dewaxing, roasting: the formwork formed through the process of second step shell is put into dewaxing groove and carry out preliminary dewaxing treatment, and then wax-pattern is put into continuous tunnel furnace, carry out further roasting dewaxing, formwork puts into continuous tunnel furnace, natural gas is added in continuous tunnel furnace, through preheating, low-temperature bake, then high-temperature roasting is to 800-900 degree, comes out of the stove.Roasting qualified shell should be white translucent shape, not over-emitting black exhaust when coming out of the stove.The shell of each roasting answers bakes to burn the article good, and once-cast is complete, ensure shell come out of the stove come out of the stove with molten steel synchronous.
4th step, cast molding: after foundry goods is shaping, when molten steel temperature, composition reach requirement all, and deoxidation completes, with the careful slag hitting of slagging agent, cast in die cavity molten steel, poring rate is fast, and molten metal can be made to be full of casting mold very soon, to the foundry goods requiring to cool simultaneously, poring rate is favourable soon, because of having a narrow range of temperature of casting mold each several part: during castings desire consecutive solidification, and poring rate should be lower, because the temperature difference of foundry goods each several part is large, be convenient to feeding with regard to making the shrinkage cavity of foundry goods concentrate.Tapping temperature is generally high 80 ~ 120 degree than molten steel liquidus temperature (temperature when just all having melted).Sample analysis after stove is got in casting, will check blowing-ouf of lines situation after tapping in time, when determining no problem, can continue to use, if seriously corroded, could use after should repairing.
Destroy the die cavity of casting exterior, take off that foundry goods carries out polishing, ball blast, after heat treatment, obtain casting finished products.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (8)
1. a manufacture method for precision casting mold, is characterized in that: comprise following processing step successively:
The first step, compacting wax-pattern: the wax-pattern suppressed is put into water cooling, sizing, then carry out overlap, the repairing of burr and correction, the wax-pattern surface configuration after correction, physical dimension and prototype face are consistent;
Second step, shell processed: wax-pattern is carried out dip-coating material, stucco, sclerosis, washing process;
First, surface layer process: immersed by wax-pattern in coating, makes paint on wax-pattern, then on wax-pattern, spreads 50-40 object facing sand, and immersed in hardening bath by the wax-pattern sprinkled with facing sand, firm time is 1-5 minute, the wax-pattern washing after being hardened by surface layer;
Then, transition zone process: the wax-pattern through surface layer process is immersed in coating, makes paint on wax-pattern, then on wax-pattern, spread 40-20 object transition sand, immersed in hardening bath by wax-pattern sprinkled with transition sand, firm time is 10-20 minute, the wax-pattern washing after finally being hardened by transition zone;
Finally, back-up coat process: the wax-pattern through transition zone process is immersed in coating, makes paint on wax-pattern, then on wax-pattern, spread 10 objects reinforce sand, immerse sprinkled with the wax-pattern reinforcing sand in hardening bath, firm time is 30-40 minute, the wax-pattern washing after finally being hardened by back-up coat; Repeat 1-5 back-up coat process;
Wherein: hardening bath selects concentration to be greater than the calcium chloride of 25%;
3rd step, dewaxing, roasting: the formwork formed through the process of second step shell is put into dewaxing groove and carry out preliminary dewaxing treatment, and then wax-pattern is put into continuous tunnel furnace, dewax further, form die cavity;
4th step, cast molding: molten steel of casting in die cavity, after foundry goods is shaping, destroy the die cavity of casting exterior, takes off that foundry goods carries out polishing, ball blast, after heat treatment, obtains casting finished products.
2. the manufacture method of precision casting mold according to claim 1, is characterized in that: in second step, and the concentration of calcium chloride is 25%-50%.
3. the manufacture method of precision casting mold according to claim 1, is characterized in that: in second step, the mixed liquor of coating selection waterglass coating, fecula and n-octyl alcohol.
4. the manufacture method of precision casting mold according to claim 1, is characterized in that: several wax-pattern interval is fixed on one and waters on rod, forms one group of module, in units of module, carries out shell processed, dewaxing, roasting and cast molding.
5. the manufacture method of precision casting mold according to claim 4, is characterized in that: during dip-coating material, and module rotates and moves up and down in paint can, then mentions module, left and right, rotates module up and down, and unnecessary coating is dripped, and the coating on module is even.
6. the manufacture method of precision casting mold according to claim 1, it is characterized in that: in second step, facing sand material is quartz sand, and transition sand material is quartz sand or bastard coal sand, and the material of back-up coat is used recovery sand in bastard coal sand or sand process processed.
7. the manufacture method of precision casting mold according to claim 1, is characterized in that: the technological parameter of compacting wax-pattern: pressure injection temperature: 55-65 degree; Dwell time: 10-20 second; Pressure Casting: 0.2-0.5Mpa.
8. the manufacture method of precision casting mold according to claim 1, it is characterized in that: in roasting process, formwork puts into continuous tunnel furnace, in continuous tunnel furnace, add natural gas, and through preheating, low-temperature bake, then high-temperature roasting is to 800-900 degree, comes out of the stove.
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| CN201610088591.1A CN105499505A (en) | 2016-02-17 | 2016-02-17 | Manufacturing method for precision casting mould |
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Cited By (11)
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|---|---|---|---|---|
| CN106077561A (en) * | 2016-08-22 | 2016-11-09 | 浙江遂金特种铸造有限公司 | Low speed synchronous belt pulley casting technique |
| CN106513575A (en) * | 2016-09-29 | 2017-03-22 | 广西大学 | Manufacturing method of precise casting mold |
| CN107414027A (en) * | 2017-06-28 | 2017-12-01 | 宁波乾豪金属制品有限公司 | Luggage carrier after a kind of |
| CN108356224A (en) * | 2018-02-28 | 2018-08-03 | 浙江立大阀门有限公司 | A kind of valve essence casting environment-protective process flow |
| CN110976768A (en) * | 2019-12-24 | 2020-04-10 | 浙江瑞朗特种合金材料有限公司 | Shell manufacturing process of alloy casting |
| CN111264982A (en) * | 2020-01-20 | 2020-06-12 | 上海晓泉珠宝有限公司 | Method for manufacturing cross coin |
| CN111633189A (en) * | 2020-06-13 | 2020-09-08 | 陈秀兰 | High-precision casting process |
| CN111774531A (en) * | 2020-06-16 | 2020-10-16 | 北京百慕航材高科技有限公司 | Shell preparation method |
| CN112338143A (en) * | 2020-10-27 | 2021-02-09 | 无锡阿尔法精密机械制造有限公司 | Investment casting process of shaft blank |
| CN112387930A (en) * | 2019-08-19 | 2021-02-23 | 张文利 | Water glass investment casting shell making process |
| CN112642991A (en) * | 2020-12-10 | 2021-04-13 | 镇江同舟螺旋桨有限公司 | Propeller blade production process based on precision casting |
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Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106077561A (en) * | 2016-08-22 | 2016-11-09 | 浙江遂金特种铸造有限公司 | Low speed synchronous belt pulley casting technique |
| CN106513575A (en) * | 2016-09-29 | 2017-03-22 | 广西大学 | Manufacturing method of precise casting mold |
| CN107414027A (en) * | 2017-06-28 | 2017-12-01 | 宁波乾豪金属制品有限公司 | Luggage carrier after a kind of |
| CN107414027B (en) * | 2017-06-28 | 2020-04-21 | 宁波乾豪金属制品有限公司 | Preparation method of rear luggage rack |
| CN108356224A (en) * | 2018-02-28 | 2018-08-03 | 浙江立大阀门有限公司 | A kind of valve essence casting environment-protective process flow |
| CN112387930A (en) * | 2019-08-19 | 2021-02-23 | 张文利 | Water glass investment casting shell making process |
| CN110976768A (en) * | 2019-12-24 | 2020-04-10 | 浙江瑞朗特种合金材料有限公司 | Shell manufacturing process of alloy casting |
| CN111264982A (en) * | 2020-01-20 | 2020-06-12 | 上海晓泉珠宝有限公司 | Method for manufacturing cross coin |
| CN111633189A (en) * | 2020-06-13 | 2020-09-08 | 陈秀兰 | High-precision casting process |
| CN111633189B (en) * | 2020-06-13 | 2021-06-04 | 常熟市耀华机械有限公司 | Hanging coating machine for casting high-precision casting and casting process of casting |
| CN111774531A (en) * | 2020-06-16 | 2020-10-16 | 北京百慕航材高科技有限公司 | Shell preparation method |
| CN111774531B (en) * | 2020-06-16 | 2021-12-10 | 北京航空材料研究院有限公司 | Shell preparation method |
| CN112338143A (en) * | 2020-10-27 | 2021-02-09 | 无锡阿尔法精密机械制造有限公司 | Investment casting process of shaft blank |
| CN112338143B (en) * | 2020-10-27 | 2022-06-24 | 无锡阿尔法精密机械制造有限公司 | Investment casting process of shaft blank |
| CN112642991A (en) * | 2020-12-10 | 2021-04-13 | 镇江同舟螺旋桨有限公司 | Propeller blade production process based on precision casting |
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Application publication date: 20160420 |