Good aqulity & after-sale service lost foam casting equipment
Product Description
Foamcast process – White Side
Polystyrene pattern moulding: Unlike other thermoplastic processes, the production of Polystyrene Foam (Thermocole) Patterns requires that the raw materials be pre-conditioned prior to their final 'tooled' moulding process. The raw material (also known as 'expandable polystyrene' or 'bead') has a spherical shape and is similar to sugar in appearance.
The conversion process is carried out in following stages:
Pre-expansion: The tiny spherical polystyrene beads are expanded to about 40 times their original size using a small quantity of pentane (typically 5 per cent by weight) as a blowing agent. This process involves the heating of beads, using a flow of steam, which causes the blowing agent to boil and thus a honeycomb of closed cells is formed.
Maturing: As the material cools the pentane liquefies and a partial vacuum is formed inside the bead. The beads are returned to a holding tank for approximately 12 hours to allow the pressure differential to equalise, giving a stabilised granule.
Final Moulding: In this final stage the pre-expanded stabilised beads are reheated with steam in a mould that moulds a pattern that essentially is identical to the casting. The final expansion takes place and the beads fuse to give a shaped pattern. In this final form the Polystyrene Foam (Thermocole) Pattern is made up of 98 per cent air.
The patterns are formed in aluminium mould tools. These are generally of male and female form, with the shape between the two halves of the mould being the shape, of the casting.
The mould tool is fitted into a moulding machine, which has the facility to introduce steam from behind each half of the tool. The steam is introduced through small slotted vents, which have been machined into the mould tool when it was manufactured.
Polystyrene pattern assembly: After the patterns are dried they are ready for assembly. In this process the pattern is assembled by gluing Polystyrene foam runners and risers in case of a single large pattern. In case of smaller patterns, multiple patterns are a assembled by gluing Polystyrene foam runners and risers in a 'tree' or a 'cluster' connecting to the patterns to the main polystyrene foam 'sprue' which is the central column.
Polystyrene pattern coating: Ceramic shell moulds are made from a mixture of graded refractory fillers that are blended to a slurry consistency. A ceramic shell builds around the polystyrene foam pattern assembly as it is repeatedly dipped in the slurry.
Ceramic shell: This mould is heated to a high temperature in a heat treatment furnace until the polystyrene foam evaporates. Simultaneously during this process the ceramic shell is sintered and becomes rigid.
Foamcast process - Black Side
One of the important tricks in making consistently reliable 'lost foam', or Lost Foam castings, is engineering the filling of the flask with sand. The foam cluster must be totally surrounded and structurally supported by sand without being distorted or causing dimensional changes. Sand fill around the foam can be accomplished in several ways, two of which, fill tubes and rain fill.
Proper compaction of the dry sand is an essential element of a successful lost foam system. The sand must be totally compacted in all areas of the flask to correctly position and support the foam cluster for dimensionally stable castings to be produced consistently. Vibration is now utilized to compact the sand. Compaction tables for foam pattern castings having horizontal or vertical-axis movement.
Sand fill and compaction are important keys to success of the process and must not be taken lightly.
Once the compaction of the sand is complete the flask is ready for pouring. The pouring can be done either manually or by automatic pouring using a bottom pouring ladle.
Packaging & Shipping
Packing: Nude packing and bulk packing
Shipping: If our clients do not have a certain port, we recommend Qingdao.
Our Services
1. Reply your inquiry in 24 working hours.
2. Experienced staffs answer all your questions in fluent English.
3. Customized design is available.
4. Exclusive and unique solution can be provided to our customer by our well-trained and professional engineers and staff.
5. Professional factory : We are manufacturer, specializing in producing all kinds of machinery for many years, competitive with good quantity.
6. As an honest seller, we always use superior raw material, advanced machines, skilled technicians to ensure our products to be finished in high quality and stable feature. Welcome to contact us or visit our company.
Company Information
Qingdao Shengmei Machinery Co., Ltd, which has a dozen years of history, is specialized in vacuum process casting machines, lost foam molding machines and resin sand reclamation equipments. Having more than ten employees who is specialized in mechanical design, electrical design and foundry technology, our company has wide experience in research and development, production, installation, debugging and service. Based on good business reputation, scientific internal management, excellent product quality and service and a range of social acceptance, our company has established the dominant position in the field of vacuum process casting, lost foam molding and resin sand reclamation.
Qingdao Shengmei Machinery Co., Ltd, which has strong power of making and processing, covers an area of 5000 square meters, with 6000*2500 Planer type milling machine, 4000*1250 Planer type milling machine, 1800*1500 boring mill,4000*1500 Single column boring and milling machine and 2610 vertical machine center. Our company integrate research and development, production, installation, debugging and after-sale service to ensure our machines' normal and reliable operation.
So far, we have about 100 clients who are from fields of car, mining machinery, concrete machinery, hoisting machinery, reducer, engineering machinery, valve, mold and machine tool, which has dozens of varieties, for example, axle, wear parts for mine, wear parts for cement, counterweight iron, reducer enclosure, engineering machinery segments, valve seat, aluminium alloy mold and machine tool body. Our clients spread all over China and some of them are doing export business. By now, all the users has been checked and accepted.
