时间阅读：5分钟
So you’ve got a part to design, and the first step is to determine what material it should be made out of. You decide the part should be plastic, and it should beCNC加工, but does the selection stop there? Nope, there are a plethora of plastics to choose from, each with its own combination of properties.
在本指南中，我将帮助您将项目需求与右侧塑料材料保持一致。出于本文的目的，我将缩小到虚构平台提供的几种塑料材料的选择CNC加工. For more information on a broader selection of plastics for CNC machining, check out Fictiv’s full range of capabilities onfictiv.comunder “Materials” in the navigation.
I’ll provide a material properties overview + benefits, drawbacks, and common uses for:
P.S.如果您知道您的部件应该是塑料，但您不确定它是否应该是CNC加工或3D印刷，check out this article first.
ABS塑料
概述
ABS is a well rounded general use plastic. It offers high impact strength, toughness, and electrical resistance at a low price. It is also easy to finish, as it can be readily painted, glued, or welded together. If left as-machined, it will have a matte finish, although it can be somewhat shiny, depending on how it is machined.
Benefits
ABS是通用原型的绝佳选择，预成型原型，接受撞击的零件，需要韧性，或者需要低成本。
Drawbacks
ABS does not have good abrasion or chemical resistance and will melt in acetone. It is also not an exceptionally strong plastic. Additionally, due to stricter environmental regulations on the West Coast of the U.S., large pieces of ABS are only manufactured in the Midwest and on the East Coast. This means that stock over two inches thick often takes a week to ship, leading to long production time for large ABS parts.
常见应用
ABS最常见的应用是注塑成型, to make electronics enclosures, household appliances, and even the iconic Lego bricks.
尼龙
概述
尼龙6/6is a strong and durable plastic, applicable to a wide variety of purposes.
Benefits
尼龙具有高强度和刚性，可在宽温度范围内保持良好的温度和良好的电气绝缘和良好的化学和耐磨性。Nylon 6/6是一种适用于低成本所需的应用的应用的良好选择。
Drawbacks
尼龙6/6will absorb moisture, causing it to swell and lose some dimensional accuracy. It can also warp if there is a large amount of asymmetric material removal during machining, due to internal stresses inherent in the material.
常见应用
尼龙is most commonly found in medical devices, circuit board mounting hardware, automobile engine compartment components, and zip ties. In many of these applications it is used as an economical alternative to metals.
Acrylic
概述
丙烯酸,也称为Plexiglass or Luctie, is the trade name for PMMA plastic. It is tough, with decent impact strength and scratch resistance, and can be easily glued using acrylic cement.
Benefits
适用于需要光学透明度或半透明的任何应用，或者作为耐用但更便宜的聚碳酸酯的替代品。
Drawbacks
然而，丙烯酸是一种脆性塑料，并且通过破裂或破裂而不是通过拉伸来失效。任何丙烯酸碎片上的任何机加工表面都会失去透明度，并采取磨砂，半透明的外观。因此，如果丙烯酸部分应留在库存厚度以保持透明度，则通常是一个好主意。如果在机加工表面上需要透明度，则可以作为额外的后处理步骤抛光。
常见应用
苹果酱是透明的，最常用作轻质替代玻璃或用于玻璃的替代品light pipes.
Delrin
概述
Delrin is a particular brand of acetal homopolymer (aka POM). It has a slippery, low friction surface, excellent dimensional stability, and high stiffness.
Benefits
Delrin是一种良好的塑料，适用于这些或任何其他任何其他应用程序，这些应用程序将经历大量摩擦，需要紧密的公差，或者需要高刚度材料。
Drawbacks
Delrin滑溜的缺点，耐磨表面是胶水很难。该材料还具有内部应力，使其在薄或具有大量不对称材料去除的区域中易于翘曲。
常见应用
Delrin通常用于齿轮，轴承，衬套和紧固件，或制作装配夹具和夹具。
HDPE
概述
HDPE stands for high density polyethylene.
Benefits
Despite its name, HDPE is the least dense plastic we offer, and it also has excellent chemical resistance, electrical insulation, and a slippery surface. It is well suited for making plugs and seals, due to its chemical resistance and slipperiness, but is also a good choice for weight-sensitive or electrically sensitive applications.
Drawbacks
HDPE的主要缺点是它的强度差，特别是张力和弯曲。
常见应用
HDPE通常用于流体应用，例如燃料箱，塑料瓶和流体流动管道。
Polycarbonate
概述
聚碳酸酯是我们最耐用的塑料。
Benefits
It has a very high impact resistance and stiffness, and remains functional over a wide range of temperatures. It is also optically clear, although it can be dyed black if opaqueness is needed. Polycarbonate is best suited for applications in which a very tough or very strong plastic is needed, or where optical transparency is desired. Because of this, polycarbonate is one of the most used, and most recycled, plastics.
Drawbacks
Pure polycarbonate does not have good wear resistance and is prone to scratches. Anti-scratch coatings and vapor polishing can be added as a post processing step to improve wear resistance or optical clarity, if needed. It is also not readily available in pieces over two inches thick, which limits the size of parts that can be made of polycarbonate.
常见应用
Polycarbonate’s durability and transparency mean it is used to make optical disks, safety glasses, light pipes, and even bulletproof glass.
主要的外卖
Hopefully, this guide has provided insight into which plastic is best suited to your application. For more information on additional CNC materials andCNC加工servicesin general, visitf’s website.
