CN105728651A - Preset inner core integral forming method for evanescent mold for complex workpiece - Google Patents
Preset inner core integral forming method for evanescent mold for complex workpiece Download PDFInfo
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- CN105728651A CN105728651A CN201610095492.6A CN201610095492A CN105728651A CN 105728651 A CN105728651 A CN 105728651A CN 201610095492 A CN201610095492 A CN 201610095492A CN 105728651 A CN105728651 A CN 105728651A
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- inner core
- preset
- mould
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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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/22—Moulds for peculiarly-shaped castings
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Abstract
The invention belongs to the technical field of processing models and relates to a preset inner core integral forming method for an evanescent mold for a complex workpiece. The preset inner core integral forming method for the evanescent mold for the complex workpiece is characterized in that a white mold of the evanescent mold adopts preset inner core integral forming without an adhesion step. The preset inner core integral forming method for the evanescent mold for the complex workpiece eliminates the tedious adhesion process, also improves the inner and outer apparent masses of production, weakens the labor intensity, is higher in requirements for smoothness and gas tightness when being used for multiple curved surfaces, thin walls and inner walls, very easy in casting production of the evanescent mold of a part such as an exhaust pipe, accurate in size of a processed part and smooth in inner and outer walls, also ensures the requirement for the gas tightness and the quality of a rough casting, increases the yield and thus reaching the purpose of producing a qualified casting under the condition of lowering the labor intensity, saving the energy and greatly lightening the environmental pollution.
Description
Technical field
The invention belongs to processing model technical field, be specifically related to a kind of complex part evaporative pattern preset inner core integral forming method of preset inner core integral forming method, particularly exhaustor evaporative pattern.
Background technology
Processing generally for some complex parts, the class parts such as such as engine cylinder-body, cylinder cap, exhaustor, many curved surfaces, there are air-tightness requirement, the ash of thin-walled (the usual 4-6mm of wall thickness), magnesium iron pipe fitting, but also there is the heat-resisting ductile iron part of some wall thickness 3mm, the final finished rate of this kind of pipe fitting ordinary sand casting method is only 30% so that production cost remains high.
Progress along with technology, employing lost foam casting process produces, yield rate is up to 85%, but in process of production, due to part thin-walled, curved surface typing, inwall require bright and clean and bonding time cervical region inner chamber do not observe, cause white mould mould assembly bonding very difficult, and cervical region gas leakage risk probability causes greatly and scraps, after blank after cast, road polishing workload is very big, and cost of labor accounts for whole cost of parts proportion higher (accounting for the 60% of part total production cost), and production capacity does not reach demand.
Summary of the invention
The one that the purpose of the present invention proposes to overcome above difficulty adopts the white mould integral forming method of the preset inner core of evaporative pattern.
The main technical schemes of the present invention: the preset inner core integral forming method of complex part evaporative pattern, is characterized in that the white mould of evaporative pattern adopts preset inner core global formation, and the white mould of evaporative pattern does not need bonding step.
Usually, the preset inner core global formation of the white mould of described evaporative pattern is to be placed in forming parts mold cavity by inner chamber core good for pretreatment, by air pressure, the molding beadlet after ripening is injected in mold cavity, mould heating makes molding beadlet expand further in mold cavity and extruding fusion obtains the preset inner core global formation bubbles model of part mutually.
Preferably, above-mentioned air pressure is 0.2 ~ 0.4MPa, mould heating-up temperature 115 ~ 120 DEG C.
The present invention is for exhaustor, and a kind of typical preparation method comprises the following steps:
1. part blank hollow or solid inner chamber core is made of usual resins sand；
2. the inner chamber core outer surface made is coated with one layer of water resistant coating, dry for standby；
3. send out expansion 30 ~ 40 times by pre-in sealing container for the mixed material of polymethyl methacrylate and polystyrene, obtain containing residual pentane beadlet, be placed in the container that stainless steel and iron silk screen is made by this molding beadlet ripening 5-8 hour；
4. the standby inner chamber core after drying is put in exhaustor shaping mould type intracavity, and with 0.2 ~ 0.4MPa air pressure, the molding beadlet after ripening is injected in mold cavity；
5. mould is heated to 115 ~ 120 DEG C after completing by above-mentioned work, makes molding beadlet expand further in mold cavity under the effect of residual pentane and extruding fusion obtains the preset inner core global formation bubbles model of exhaustor mutually；
6. the bubbles model made is removed from the molds, sends in drying unit and dry so that the preset inner core white mould of global formation bubbles model dries；
7. preset for the dried exhaustor inner core white mould of global formation bubbles model and running gate system being sticked with glue and connect group string, outside is coated with conventional coating after having gone here and there by group, and the white mould after being coated with is placed in continuous oven drying in the drying chamber of 45 ~ 55 DEG C；
8. each group of string and running gate system are sticked with glue and connect composition cluster and put into airtight sandbox gaza ram-jolt, and pour into a mould under-0.03 ~-0.02MPa negative pressure, make variety of moduli gasification molten iron fill type, required exhaust pipe casting blank after cooling, can be obtained.
The inventive method eliminates loaded down with trivial details technique for sticking, improves simultaneously and produces inside and outside apparent mass, reduces labor intensity.For many curved surfaces, thin-walled, inwall, this method requires that bright and clean, air-tightness requires higher, the lost foam casting of such as aerofluxus pipe part produces and very easily realizes.This method is also applied for the complex parts of engine cylinder-body cylinder cap, bonding process after the cancellation white mode division sheet molding of engine cylinder-body cylinder cap simultaneously.The accessory size of processing is accurate, and inside and outside wall is smooth, ensures airtight requirement simultaneously, it is ensured that the quality of spray, improves yield rate, and then realizes reducing labor intensity, saves the energy, greatly alleviate the purpose producing castings under environmental pollution states.
Accompanying drawing explanation
Fig. 1 is exhaustor mould die cavity schematic diagram in the embodiment of the present invention.
Fig. 2 is inner chamber core schematic diagram in embodiment.
Fig. 3 is that in embodiment, inner chamber core is placed in exhaustor mould die cavity schematic diagram.
Fig. 4 is the white mould schematic diagram of the exhaustor after embodiment molding.
Detailed description of the invention
Below in conjunction with embodiment and accompanying drawing, the inventive method is described in detail in.
Embodiment
Following example are processed as example with exhaust pipe casting blank.
With reference to accompanying drawing 1-4, the preset inner core integral forming method of the present embodiment exhaustor evaporative pattern, its main innovation is to eliminate in conventional processes the complicated and bonding step of the white mould of heavy evaporative pattern, and adopt the preset inner core integral forming method of the white mould of evaporative pattern, concrete technology method comprises the following steps:
1. part blank hollow or solid inner chamber core is made of usual resins；
2. the inner chamber core outer surface made is coated with one layer of water resistant coating, dry for standby；
3. send out expansion 30 ~ 40 times by pre-in sealing container with the mixed material STMMA (commercially available half copolymerization material) of polystyrene for polymethyl methacrylate, obtain containing residual pentane beadlet, be placed in the container that stainless steel and iron silk screen is made by this molding beadlet ripening 5-8 hour；
4. the standby inner chamber core after drying is put in exhaustor shaping mould type intracavity, and with 0.2 ~ 0.4MPa air pressure, the molding beadlet after ripening is injected in mold cavity；
5. mould is heated to 115 ~ 120 DEG C after completing by above-mentioned work, makes molding beadlet expand further in mold cavity under the effect of residual pentane and extruding fusion obtains the preset inner core global formation bubbles model of exhaustor mutually；
6. the bubbles model made is removed from the molds, sends in drying unit and dry so that the preset inner core white mould of global formation bubbles model dries；
7. preset for the dried exhaustor inner core white mould of global formation bubbles model and running gate system being sticked with glue and connect group string, outside is coated with conventional coating after having gone here and there by group, and the white mould after being coated with is placed in continuous oven drying in the drying chamber of 45 ~ 55 DEG C；
8. each group of string and running gate system are sticked with glue and connect composition cluster and put into airtight sandbox gaza ram-jolt, and pour into a mould under-0.03 ~-0.02MPa negative pressure, make variety of moduli gasification molten iron fill type, required exhaust pipe casting blank after cooling, can be obtained.
Embodiment method applies also for the part such as engine cylinder-body, cylinder cap.Can according to said method make complex part, it is to avoid bonding after sheet, formation of lots, reduce the workload of bonding process and reduce because of the bonding improper non-hermetic risk brought, the workload of polishing operation can be reduced simultaneously.
Claims (4)
1. the preset inner core integral forming method of complex part evaporative pattern, is characterized in that the white mould of evaporative pattern adopts preset inner core global formation, and the white mould of evaporative pattern does not need bonding step.
2. the method for claim 1, it is characterized in that the preset inner core global formation of the white mould of evaporative pattern is to be placed in forming parts mold cavity by inner chamber core good for pretreatment, by air pressure, the molding beadlet after ripening is injected in mold cavity, mould heating makes molding beadlet expand further in mold cavity and extruding fusion obtains the preset inner core global formation bubbles model of part mutually.
3. method as claimed in claim 2, it is characterised in that described air pressure is 0.2 ~ 0.4MPa, described mould heating-up temperature 115 ~ 120 DEG C.
4. the method as described in one of claim 1-3, is characterized in that comprising the following steps: 1) part blank hollow or solid inner chamber core is made of usual resins sand；2) the inner chamber core outer surface made is coated with one layer of water resistant coating, dry for standby；3) send out expansion 30 ~ 40 times by pre-in sealing container for the mixed material of polymethyl methacrylate and polystyrene, obtain containing residual pentane beadlet, be placed in the container that stainless steel and iron silk screen is made by this molding beadlet ripening 5-8 hour；4) the standby inner chamber core after drying is put in forming parts mold cavity, and with 0.2 ~ 0.4MPa air pressure, the molding beadlet after ripening is injected in mold cavity；5) mould is heated to 115 ~ 120 DEG C after completing by above-mentioned work, makes molding beadlet expand further in mold cavity under the effect of residual pentane and extruding fusion obtains the preset inner core global formation bubbles model of part mutually；6) bubbles model made is removed from the molds, sends in drying unit and dry so that the preset inner core white mould of global formation bubbles model dries；7) preset for the dried part inner core white mould of global formation bubbles model and running gate system being sticked with glue and connect group string, outside is coated with conventional coating after go here and there by group, and the white mould after being coated with is placed in continuous oven drying in the drying chamber of 45 ~ 55 DEG C；8) each group of string and running gate system are sticked with glue connect composition cluster and put into airtight sandbox gaza ram-jolt, and pour into a mould under-0.03 ~-0.02MPa negative pressure, make variety of moduli gasification molten iron fill type, required part spray after cooling, can be obtained.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201610095492.6A CN105728651A (en) | 2016-02-22 | 2016-02-22 | Preset inner core integral forming method for evanescent mold for complex workpiece |
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| CN201610095492.6A CN105728651A (en) | 2016-02-22 | 2016-02-22 | Preset inner core integral forming method for evanescent mold for complex workpiece |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107520406A (en) * | 2017-09-12 | 2017-12-29 | 东方电气集团东方汽轮机有限公司 | A kind of long tube shape component casting method |
| CN108907098A (en) * | 2018-08-17 | 2018-11-30 | 兴化市兴东铸钢有限公司 | A kind of method of the evaporative pattern combination ceramic core production with hole casting parts |
| CN111390111A (en) * | 2020-04-02 | 2020-07-10 | 邯郸慧桥复合材料科技有限公司 | Lost foam casting method for narrow-groove long hole |
| CN113426953A (en) * | 2021-07-02 | 2021-09-24 | 洛阳刘氏模具有限公司 | Lost foam inner cavity water channel and air flue composite molding casting process |
| CN114346181A (en) * | 2022-01-10 | 2022-04-15 | 重庆市精利模具制作有限责任公司 | Thin aluminum exhaust pipe processing die for engine |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107520406A (en) * | 2017-09-12 | 2017-12-29 | 东方电气集团东方汽轮机有限公司 | A kind of long tube shape component casting method |
| CN108907098A (en) * | 2018-08-17 | 2018-11-30 | 兴化市兴东铸钢有限公司 | A kind of method of the evaporative pattern combination ceramic core production with hole casting parts |
| CN111390111A (en) * | 2020-04-02 | 2020-07-10 | 邯郸慧桥复合材料科技有限公司 | Lost foam casting method for narrow-groove long hole |
| CN113426953A (en) * | 2021-07-02 | 2021-09-24 | 洛阳刘氏模具有限公司 | Lost foam inner cavity water channel and air flue composite molding casting process |
| CN114346181A (en) * | 2022-01-10 | 2022-04-15 | 重庆市精利模具制作有限责任公司 | Thin aluminum exhaust pipe processing die for engine |
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