Various molding process GIF picture

Die casting

(Note that die casting is not an abbreviation for pressure casting) is a metal casting process characterized by the use of a mold cavity to apply high pressure to the molten metal. Molds are usually machined from higher strength alloys, some of which are similar to injection molding.

Sand casting


 It is to use sand to make a mold. Sand casting requires placing a finished part model or a wooden model (pattern) in the sand, then filling the sand in the pattern weekend, and unpacking the pattern to form the mold.

In order to remove the mold before casting the metal, the mold should be made into two or more sections; during the mold making process, holes and vent holes for casting metal into the mold must be left to synthesize the casting system. The casting mold is poured with the metal liquid for a suitable period of time until the metal solidifies. After the parts are removed, the mold is destroyed, so a new mold must be made for each casting.

Investment casting




Also known as lost wax casting, including waxing, waxing, grouping, dipping, melting wax, casting molten metal and post-treatment. Lost wax casting is a wax mold in which a part is to be cast with wax, and then the wax mold is coated with mud, which is a mud mold. After the mud mold is dried, it is baked into a ceramic mold. Once calcined, the wax mold is completely melted and lost, leaving only the ceramic mold. In the general clay mold, the pouring port is left, and the molten metal is poured from the pouring port. After cooling, the required parts are prepared.

Die forging
 It is a forging method for forming a forging by molding a blank by using a mold on a special die forging equipment. According to different equipment, die forging is divided into hammer forging, crank press forging, flat forging die forging, friction press forging and so on. Roll forging is a plastic forming process in which a material is plastically deformed by a pair of counter-rotating dies to obtain a desired forging or forging blank. It is a special form of forming rolling (longitudinal rolling).

Forging
It is one of the two major components of forging (forging and stamping) by using a forging machine to apply pressure to a metal blank to plastically deform it to obtain a forging having a certain mechanical property, a certain shape and size. Through forging can eliminate defects such as as-cast looseness caused by metal in the smelting process, optimize the microstructure, and at the same time, the mechanical properties of the forgings are generally better than those of the same materials due to the preservation of the complete metal flow lines. For important parts of the relevant machinery with high load and severe working conditions, forgings are often used except for the available rolled sheets, profiles or welded parts.

Rolling

Also known as calendering, it refers to the process of shaping a metal ingot through a pair of rollers. If the temperature is delayed and the temperature of the metal exceeds its recrystallization temperature, then this process is called "hot rolling", otherwise it is called "cold rolling". Calendering is the most common means of metal processing.

Pressure casting
 The essence is a method of filling a die-cast type (die-casting mold) cavity with a high speed under a high pressure, and molding and solidifying under pressure to obtain a casting.

Low pressure casting
 A casting method in which a liquid metal is filled with a mold under a low pressure gas and solidified into a casting. Low-pressure casting was originally used mainly for the production of aluminum alloy castings, and further expanded its use in the future to produce copper castings, iron castings and steel castings with high melting points.

Centrifugal casting

 It is a technique and method for injecting liquid metal into a mold that rotates at a high speed to fill the mold and form a casting under the action of centrifugal force. For castings used in centrifugal casting, depending on the shape, size and production volume of the casting, non-metallic (such as sand, shell or investment shell), metal or metal coatings or resin sands may be applied. Casting.

Lost foam casting

 The paraffin or foam model similar in shape and shape of the casting is bonded into a model cluster, brushed with refractory paint and dried, embedded in dry quartz sand for vibration modeling, and poured under negative pressure to vaporize the model, liquid metal A new casting method that takes up the position of the model and forms a casting after solidification and cooling. Lost foam casting is a new process with no margin and precise molding. The process does not require mold taking, no parting surface, no sand core, so the casting has no flash, burr and draft angle, and the core is reduced. Size error caused by combination.

Squeeze casting
 Also known as liquid die forging, the molten metal or semi-solid alloy is directly injected into the open mold, and then the mold is closed to generate a filling flow, reaching the outer shape of the workpiece, and then applying a high pressure to the solidified metal (the outer shell) ) plastic deformation occurs, the unsolidified metal is subjected to isostatic pressing, and at the same time high pressure solidification occurs, and finally the method of obtaining the part or the blank is obtained by direct extrusion casting; and the indirect extrusion casting means passing the molten metal or semi-solid alloy The punch is injected into the closed mold cavity, and a high pressure is applied to crystallize and solidify under pressure, and finally a method of obtaining a part or a blank is obtained.

Continuous casting
 It is a casting method in which a liquid metal is continuously poured at one end by a through crystallizer, and a molding material is continuously pulled out from the other end.


Pull
 It is a plastic working method in which an external force is applied to the front end of the drawn metal to pull the metal blank from the die hole smaller than the cross section of the blank to obtain a product of a corresponding shape and size. Since drawing is carried out in a cold state, it is also called cold drawing or cold drawing.

stamping
 It is a method of forming a workpiece (stamping part) of a desired shape and size by applying an external force to a plate, a strip, a pipe, a profile, and the like by a press and a mold to cause plastic deformation or separation.

Metal injection molding
 (Metal Injection Molding, MIM for short) is a new type of powder metallurgy near net shape forming technology. It is well known that plastic injection molding technology produces various complex shapes at low prices, but the strength of plastic products is not High, in order to improve its performance, metal or ceramic powder can be added to the plastic to obtain a product with high strength and good wear resistance. In recent years, this idea has evolved to maximize the content of solid particles and completely remove the binder and densify the preform during subsequent sintering. This new powder metallurgy forming process is called metal injection molding.

Turning

 It refers to lathe processing as part of machining. The turning machine mainly uses a turning tool to turn the rotating workpiece. Lathes are mainly used for machining shafts, discs, sleeves and other workpieces with a rotating surface. They are the most widely used type of machine tool in machinery manufacturing and repairing plants. Turning is a method of cutting a workpiece on a lathe using a workpiece relative to the tool rotation. The cutting energy for turning machining is mainly provided by the workpiece rather than the tool.

Turning is the most basic and common cutting method, and it plays an important role in production. Turning is suitable for machining rotary surfaces. Most workpieces with rotary surfaces can be machined by turning, such as inner and outer cylindrical surfaces, inner and outer conical surfaces, end faces, grooves, threads and rotary forming surfaces. The tools used are mainly turning tools.

Milling

Milling is to fix the blank and use a high-speed rotating cutter to cut the blank and cut out the desired shape and features. Conventional milling is used more for simple shapes/features such as milling contours and grooves. CNC milling machines allow for the machining of complex shapes and features. The milling and boring machining center can perform three-axis or multi-axis milling and machining for machining, molds, inspection tools, tire tools, thin-walled complex curved surfaces, artificial prostheses, and blades. When selecting the content of CNC milling, the advantages and key functions of CNC milling machine should be fully utilized.

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