- Company : Qingdao Shengmei Machinery Co., Ltd.
- Region : Shandong , China
- Category : Manufacturing & Processing Machinery > Metal Processing Machinery
- Specification : 1. Q: Is your factory manufacturer or trade company? A: Our company is manufacture and we have our workshop. We welcome you-- our dearest friends to come to our company to see our producing line. 2. Q: What is your MOQ? A: one set. Qingdao Shengmei Machinery Co., Ltd Sandy Xue Any inquiry, pls feel free to contact us. Fax: 0532- 86158266 Mob: 86-15712768581 Whatsapp: 86-15712768581 Skype: xy928618
- Contact Person : Sandy Xue|||Regional sales manager
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- Website : http://www.sandry.cn
- Email : [email protected]
- Instant Messenger : Skype: xy928618 Whatsapp: +86-15712768581
- Update : Jul/17/2015
Product Details
Introduction The Lost Foam casting process originated in 1958 when H.F. Shroyer was granted a patent for a cavity-less casting method, using a polystyrene foam pattern embedded in traditional green sand. The polystyrene foam pattern left in the sand is decomposed by the poured molten metal. The metal replaces the foam pattern, exactly duplicating all of the features of the original pattern. Like other investment casting methods, this requires that a pattern be produced for every casting poured because it is evaporated (“lost”) in the process. Process Steps Mold foam pattern sections. Age pattern to allow dimensional shrinkage. Assemble pattern if it is a multiple piece pattern. Build cluster (multiple patterns per cluster). Coat cluster. Dry coating. Compact cluster in flask. Pour metal. Extract cluster from flask. Machines Black area------sand preparation and molding system 1. manipulator 2. winnowing Magnetic separators 3. sanded-up equipment 4. vibrating conveying screen classifier 5. chain elevator 6. water-cooled sand cooling equipment 7. tri-dimensional vibrating table 8. vacuum system 9. dust collector White area------make the foam mould 1. batch-type pre-foaming machine 2. vertical type mould forming machine 3. bonder machine 4. coating stirring mill 5. hot gas far infra red drying oven Advantage and disadvantage This casting process is advantageous for very complex castings that would regularly require cores. It is also dimensionally accurate, maintains an excellent surface finish, requires no draft, and has no parting lines so no flash is formed. The un-bonded sand of lost foam casting can be much simpler to maintain than green sand and resin bonded sand systems. Lost foam is generally more economical than investment casting because it involves fewer steps. Risers are not usually required due to the nature of the process; because the molten metal vaporiz
