Hand plate in some cases called the first edition, as the name implies is before mass production, according to the product appearance drawings and structure
Drawings usually start with a small number of samples, so as to check the appearance of the product or the reasonable structure of the functional sample.
Common methods are: CNC machining, SLA, SLS, SLM, FDM, vacuum compound mold, low pressure perfusion, sheet metal production. We will compare this in terms of definition, materials used, software used, workable parts, advantages and disadvantages
Several kinds of hand plate processing.
CNC machining is a computer numerical control machine tool, according to the programmed program through the control of the knife path to cut a whole sheet, is currently the most used in China.
A wide range of hand plate production methods, the operation method is complex, the operator needs to have rich experience.Mainly used in plastic and metal plate processing, can be cut on all the plate in the market, is a material reduction technology, can only be processed.
A certain radian rounded corner, and can not be directly processed out of the inner right Angle, through wire cutting/sparking and other processes to achieve.
SLA refers to stereoscopic light curing forming method, a kind of 3D printing technology. The materials used are mostly resins, and ultraviolet rays of specific wavelength and intensity are used The laser is focused on the surface of the photosensitive resin, curing it in layers and finally adding layers to form a three-dimensional entity. 3D printing is an additive technology, going from zero to one. SLA is the earliest rapid prototyping manufacturing process with high maturity. It can be directly made into prototypes from CAD digital models with fast processing speed and short production cycle. Without cutting tools and molds, SLA can process prototypes and molds with complex structure and shape or difficult to be formed by traditional means.SLA equipment is expensive and has high requirements on the factory environment. The strength, stiffness and heat resistance of the mold after forming are limited, which is not conducive to long-term storage.
SLS is a kind of selective laser melting and 3D printing technology. At present, the mature process materials are wax powder and plastic powder. Laser beam pairs when printing
The tiled powder is selectively sintered, a layer of powder cartridge down, and then tiled a layer of powder laser sintering, all sintering out of the cartridgeRemove the excess powder and you get a sintered part.SLS handplate mold made of high strength, good toughness, can be used to make bearings, gears, precision parts, electronic parts, because it does not need support,High utilization rate of materials; But it has pollution in the process of hand plate processing; The speed is relatively slow.
SLM, or selective laser melting molding technology, is the most common technology in metal 3D printing molding at present. It uses fine focusing spot for rapid processing By melting the preset metal powder, the parts with arbitrary shape and complete metallurgical combination can be obtained directly, and the production density can be reached More than 99%.In the process of SLM making hand plate molds, support materials need to be printed due to the complexity of the parts, and the support needs to be removed after the completion of the parts.
And the surface of the workpiece is processed, so the production time will be relatively long, the cost is higher.
FDM is melting forming method, FDM materials are generally thermoplastic materials, such as wax, ABS, nylon, etc., to filamentous feeding. The material in The nozzle is heated inside to melt. The nozzle moves along the section contour of the part and the filling trajectory, and at the same time extrudes the melted material, and the material solidifies rapidly.And condenses with the surrounding material. FDM in the process of making hand mold, the price is relatively low, the material is safe and harmless, no mold fee, can make a variety of colors, but can not print hollow products.
FDM processing of the hand plate die has more obvious stripes, forming accuracy is relatively low, the need to design and make support structure, forming time is long.
Vacuum complex mode
Vacuum compound mold is the use of product prototype (such as SLA or hand plate processing) in the vacuum state to produce silicone mold, and in the vacuum state In the following, PU material is used for casting, so as to clone the same copy as the product prototype.Vacuum laminating is the most common technique used in the world at present. The technology can be applied to change the material of the product prototype and assemble the prototype Or small batch production of products to meet the needs of performance testing, market promotion, inspection and approval in the process of product development;Different PU materials can be used to replicate rubber parts, transparent parts, high temperature resistant parts, etc. Ordinary PU materials are brittle, ductile and resistant High temperatures are bad.
Low-pressure injection molding, also known as low-pressure reaction injection molding, is a new technology applied to the production of rapid mold products. It is a two-component polyurethane material mixed, injected into the rapid mold under normal temperature and low pressure environment, through polymerization, crosslinking, curing and other chemical and physical processes of the material to form products.
The low-pressure perfusion hand-plate mold has the advantages of high efficiency, short production cycle, simple process and low cost. It is suitable for small batch trial production in the process of product development, as well as the production of small batch production, simple structure covering parts and large thick wall and non-uniform wall thickness products.
Sheet metal production
Sheet metal production is the processing of steel plate, aluminum plate, copper plate and other metal plates, including laser cutting, stamping, bending, etc., sheet metal processing of raw materials is the same part thickness is consistent.