In some cases, the hand board is referred to as the first edition. As the name suggests, it is a functional template for checking the rationality of product appearance or structure by making a small number of samples according to product appearance drawings and structure drawings before mass production. So which industries are users of hand board factories or hand board companies? Using the big data tool of the webmaster's house, we searched the keyword "hand board" and found that the industries with strong demand are automobile, household appliances, electrical appliances, toys, technology and so on. The commonly used methods for making hand boards and rapid tooling for these industries in China are: CNC processing, SLA, SLS, SLM, FDM, vacuum re molding, low-pressure pouring and sheet metal manufacturing. We will compare these hand board processing methods in terms of definition, materials used, software use, Machinable parts, advantages and disadvantages.

1. CNC加工

1. CNC processing

CNC加工是電腦數控機床，按編程好的程序通過控制刀路把一整塊板材切削而成，是目前在國內應用為廣泛的手板制作方法，操作方法復雜，需要操作人有豐富的經驗。主要用于在塑膠與金屬板材的加工，可在市場上所有板材上進行切割，是一種減材技術，只能加工出有一定弧度的圓角，而無法直接加工出內直角，要通過線切割/打火花等工藝來實現。

CNC machining is a computer numerical control machine tool, which cuts a whole plate by controlling the knife path according to the programmed program. It is a widely used hand board manufacturing method in China. The operation method is complex and requires the operator to have rich experience. It is mainly used for processing plastic and metal plates. It can be cut on all plates in the market. It is a material reduction technology. It can only process rounded corners with a certain radian, but can not directly process inner right angles. It should be realized by wire cutting / spark and other processes.

2.SLA

2.SLA

SLA即立體光固化成型法，3D打印技術的一種，所用材料類多為樹脂，用特定波長與強度的紫外線激光聚焦到光樹脂表面，使之層層固化，終層層疊加構成一個三維實體。凡是3D打印均是一種增材技術，從0到1的過程。SLA是早出現的快速原型制造工藝，成熟度高，由CAD數字模型直接制成原型，加工速度快，產品生產周期短，無需切削工具與模具，可以加工結構外形復雜或使用傳統手段難于成型的原型和模具。SLA設備昂貴對工廠環境要求比較高，模具成型后強度，剛度，耐熱性有限，不利于長時間保存。

SLA is a three-dimensional light curing molding method, a kind of 3D printing technology. Most of the materials used are resin. Ultraviolet laser with specific wavelength and intensity is focused on the surface of the light resin to cure it layer by layer, and the final layer is superimposed to form a three-dimensional entity. All 3D printing is an additive technology, a process from 0 to 1. SLA is an early rapid prototyping manufacturing process with high maturity. It is directly made into prototype by CAD digital model, with fast processing speed and short product production cycle. It can process prototypes and molds with complex structure and shape or difficult to be formed by traditional means without cutting tools and molds. SLA equipment is expensive and has high requirements for the factory environment. The strength, stiffness and heat resistance after mold forming are limited, which is not conducive to long-term storage.

3.SLS

3.SLS

SLS即選擇性激光熔融，3D打印技術一種，目前成熟的工藝材料為蠟粉及塑料粉。打印時激光束對平鋪的粉末進行有選擇地燒結，一層完成粉盒下降，再平鋪一層粉末激光燒結，全部燒結拿出粉盒去掉多余的粉末，就可以得到一燒結好的零件。SLS制作的手板模具強度高，韌性好，可用來制作軸承、齒輪、部件、電子部件，因不需支撐，材料的利用率高；但它的在手板加工過程中有污染；速度相對較慢。

SLS is a kind of selective laser melting and 3D printing technology. At present, the mature process materials are wax powder and plastic powder. During printing, the laser beam selectively sinters the tiled powder, one layer of powder box is lowered, and then one layer of powder is tiled for laser sintering. All the powders are sintered. Take out the powder box to remove the excess powder, and a sintered part can be obtained. SLS handboard mold has high strength and good toughness, and can be used to make bearings, gears, components and electronic components. Because it does not need support, the utilization rate of materials is high; But its is polluted in the process of handboard processing; The speed is relatively slow.

4.SLM

4.SLM

SLM即選區激光熔化成型技術，是目前金屬3D打印成型中普遍的技術，采用精細聚焦光斑快速熔化預置金屬粉末，直接獲得任意形狀以及具有完全冶金結合的零件，得到的制作致密度可達99以上。SLM制作手板模具的過程中，由于制件通常較復雜，需要打印支撐材料，制件完成后需要去除支撐，并對制件的表面進行處理，所以制作時間會比較長，成本較高。

SLM, namely selective laser melting forming technology, is a common technology in Metal 3D printing and forming. It uses fine focusing spot to quickly melt preset metal powder, directly obtain parts with arbitrary shape and complete metallurgical combination, and the manufacturing density can reach more than 99. In the process of SLM making hand mold, because the parts are usually complex and need to print support materials, the support needs to be removed and the surface of the parts needs to be treated after the parts are completed, so the manufacturing time will be long and the cost will be high.

5.FDM

5.FDM

FDM即熔積成型法，FDM的材料一般是熱塑性材料，如蠟、ABS、尼龍等，以絲狀供料。材料在噴頭內被加熱熔化。噴頭沿零件截面輪廓和填充軌跡運動，同時將熔化的材料擠出，材料迅速凝固。并與周圍的材料凝結。FDM制作手板模具的過程中， 相對較低，材料無害，無模具費，可以制作多種顏色，但是不能打印鏤空產品。

FDM is melt deposition molding method. The materials of FDM are generally thermoplastic materials, such as wax, ABS, nylon, etc., which are fed in filaments. The material is heated and melted in the nozzle. The nozzle moves along the part profile and filling track, extrudes the molten material at the same time, and the material solidifies rapidly. And condense with the surrounding materials. In the process of making hand mold, FDM has relatively low price, harmless materials and no mold cost. It can make a variety of colors, but it can not print hollow products.

FDM加工完的手板模具有較明顯條紋，成型精度相對較低，需要設計和制作支撐結構，成型時間較長。

The handboard die processed by FDM has obvious stripes, the forming accuracy is relatively low, the supporting structure needs to be designed and manufactured, and the forming time is long.

6.真空復模

6. Vacuum compound mold

真空復模是利用產品原型（如：SLA或手板加工）在真空狀態下制作出硅膠模具，并在真空狀態下采用PU 材料進行澆注，從而克隆出與產品原型相同的復制件。

Vacuum replica is to make silica gel mold under vacuum by using product prototype (such as SLA or hand plate processing), and pour it with PU material under vacuum, so as to clone the same replica as the product prototype.

真空覆膜是目前全世界使用普遍的手板復制技術；技術可應用于改變產品原型的材質、組裝樣機或進行產品小批量生產等方面，以滿足產品開發過程中的性能測試、市場推廣以及送檢、審批等需求；選用不同的PU材料，可以復制橡膠零件、透明零件、耐高溫零件等，普通PU 材料較脆、韌性及耐高溫都比較差。

Vacuum coating is a common hand board replication technology all over the world; The technology can be applied to change the material of product prototype, assemble prototype or carry out small batch production, so as to meet the needs of performance test, market promotion, inspection and approval in the process of product development; Different PU materials can be used to copy rubber parts, transparent parts, high temperature resistant parts, etc. ordinary PU materials are brittle, poor toughness and high temperature resistance.

7.低壓灌注

7. Low pressure perfusion

低壓灌注又名低壓反應注射成型，是應用于快速模制品生產的一項新工藝，它將雙組份聚氨酯材料經混合后，在常溫、低壓環境下注入快速模具內，通過材料的聚合、交聯、固化等化學和物理過程形成制品。低壓灌注生成手板模具具備效率高、生產周期短、過程簡單、成本低的優點，適用于產品開發過程中的小批量試制，以及小批量生產的、結構較簡單的覆蓋件和大型厚壁及不均勻壁厚制品的生產。

Low pressure injection, also known as low pressure reaction injection molding, is a new process applied to the production of rapid molding products. After mixing the two-component polyurethane materials, it is injected into the rapid mold at room temperature and low pressure, and the products are formed through chemical and physical processes such as material polymerization, cross-linking and curing. The low-pressure pouring 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 panels and large thick wall and uneven wall thickness products.

8.鈑金制作

8. Sheet metal fabrication

鈑金制作即對鋼板、鋁板、銅板等金屬板材進行加工，包含激光切割、沖壓、折彎等，鈑金加工的原材料的顯著特性就是同一零件厚度一致。

Sheet metal manufacturing refers to the processing of metal plates such as steel plate, aluminum plate and copper plate, including laser cutting, stamping and bending. The remarkable characteristic of raw materials for sheet metal processing is that the thickness of the same part is the same.

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