The current common processing methods of the hand model
The current common processing methods of the hand model
by：Vowin Rapid Prototyping2023-02-08
1. CNC processing, CNC processing is currently the most common processing method in the prototype industry. CNC is also called computer gong, CNCCH or CNC machine tool, which is actually a name in Hong Kong. Later, it was introduced to the Pearl River Delta of the mainland. The number of tooling, processing parts with complex shapes does not require complicated tooling. If you want to change the shape and size of the part, you only need to modify the part processing program, which is suitable for new product development and modification. Moreover, it has stable processing quality, high processing accuracy, and high repeatability; in the case of multi-variety and small-batch production, the production efficiency is high, which can reduce the time for production preparation, machine tool adjustment and process inspection, and reduce the time due to the use of the optimal cutting amount. cutting time. The material selection is also obviously superior to other processing methods, which can meet the needs of customers in terms of material strength. Basic materials can be processed. Commonly used materials are: ABS, PC, PMMA, POM, PA66, aluminum alloy, stainless steel, copper. , magnesium alloy, etc... His disadvantage is that the equipment is expensive and requires professional programming and CNC operators. Moreover, products that are not allowed to be bonded to a certain degree of replication cannot be processed. 2. Silica gel composite molds, silicone composite molds are generally used for small batch product processing, first use CNC or other processing methods to make one or several prototypes, and use silica gel to make mold filling Glue vacuum method to make products. The advantages of silicone compound mold are its fast speed, low cost, greatly reducing the cost of mold opening and cycle risk. A set of simple molds can generally produce about 20~35 products, because the material of simple molds is silica gel, which wears out quickly. If you want to do more, you can only make a new silicone mold, otherwise it will affect the accuracy of the product. 3. Rapid prototyping, RP technology, also known as SLA, SLS.. SLA is the earliest practical rapid prototyping technology, using liquid photosensitive resin raw materials, the process principle is shown in the figure. The process is to firstly design a three-dimensional solid model through CAD, use a discrete program to slice the model, and design the scanning path. The generated data will precisely control the movement of the laser scanner and the lifting table; the laser beam is scanned by the numerical control device. The device irradiates the surface of the liquid photosensitive resin according to the designed scanning path, and after a layer of resin in a specific area of the surface is cured, a section of the part is generated when one layer is processed; Cover another layer of liquid resin, and then scan the second layer. The second cured layer is firmly bonded to the previous cured layer, so that the three-dimensional workpiece prototype is formed layer by layer. After the prototype is taken out of the resin, it is finally cured, and then polished, electroplated, painted or colored to obtain the required product. The entire SLS process device is composed of a powder cylinder and a molding cylinder. When working, the powder cylinder piston (powder feeding piston) rises, and the powder spreading roller evenly spreads a layer of powder on the molding cylinder piston (working piston), and the computer slices according to the prototype. The model controls the two-dimensional scanning trajectory of the laser beam, selectively sintering the solid powder material to form a layer of the part. After one layer of powder is completed, the working piston descends by one layer thickness, and the powder spreading system spreads new powder. Control the laser beam to scan and sinter the new layer. This cycle goes on and on, layer by layer, until the three-dimensional parts are formed. Finally, the unsintered powder is recycled into the powder vat and the molded part is removed. For metal powder laser sintering, the entire workbench is heated to a certain temperature before sintering, which can reduce thermal deformation during molding and facilitate the bonding between layers. The willfulness and strength of SLS materials are higher than those of SLA. Of course, the high cost and insufficient precision are also the defects of SLS. Sheet metal processing, sheet metal processing is a key technology that sheet metal technicians need to master, and it is also an important process for forming sheet metal products. Sheet metal processing includes traditional cutting, punching, bending and forming methods and process parameters, as well as various cold stamping die structures and process parameters, various equipment working principles and operating methods, and new stamping technology. and new technology. Part metal sheet processing is called sheet metal processing. Due to the diversity of products in the prototype industry, many products require sheet metal processing. Sheet metal processing is generally subdivided into wire cutting, bending, stamping, etc.. Sheet metal processing materials are generally stainless steel, aluminum sheets, galvanized sheets and other metal materials , The general cost of sheet metal processing is relatively low. Of course, the processing methods required for the prototype model are far more than these. These are just commonly used processing methods. For example, hand-made clay prototypes are required for finalizing the shape of a car; many metal parts need to be processed by lathes; if your CNC cannot process them in place In some places, electric spark assisted machining and so on are needed... As an excellent prototype factory, it is necessary to help customers choose the most suitable processing method, and provide customers with products that not only save costs, but also meet or exceed customer needs. .