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手板在加工过程中颜色不正的原因！
来源：http://dcjzl.com作者：哈希28单双发布时间：2019-11-30
塑料手板在数控加工过程中，有时会出现各种各样的问题，如数控加工缺陷、色彩平衡、手板裂纹等小问题。今天，我想谈一谈在CNC的手板加工过程中产生颜色不规则的因素，以及其他的CNC手板的问题，这些问题将会在接下来的文章中提到。
In the process of NC machining, there are various problems, such as NC machining defects, color balance, cracks and so on. Today, I'd like to talk about the factors that cause color irregularity in the process of CNC hand board processing, as well as other problems of CNC hand board, which will be mentioned in the next article.
之前生产的手板很正常，但是突然出现手板的颜色，是不能接受的，所以造成CNC手板颜色的因素，可以从以下几个原因开始:
The handboards produced before are normal, but the color of the handboards suddenly appears, which is unacceptable. Therefore, the factors that cause the color of CNC handboards can start from the following reasons:
一、模具原因
I. die reason
1. 模具不干净，灰尘或其他灰尘沉积在材料上，导致材料被污染和变色。
1. The mold is not clean, and dust or other dust is deposited on the material, causing the material to be polluted and discolored.
2. 热电偶、温度控制器或加热系统不平衡导致温度控制失灵，温度过高导致塑料或颜料成分发生化学变化，分解变色，特别是PVC，对温度非常敏感。
2. Imbalance of thermocouple, temperature controller or heating system leads to temperature control failure, high temperature leads to chemical change of plastic or pigment composition, decomposition and discoloration, especially PVC, which is very sensitive to temperature.
3.气缸内有障碍物，容易促进塑料降解;气缸或螺旋槽内卡有金属异物，塑料变色是由于不断的磨削造成的。
3. There are obstacles in the cylinder, which is easy to promote plastic degradation; there are metal foreign matters stuck in the cylinder or spiral groove, and the plastic discoloration is caused by continuous grinding.
二世。流程的原因
II. Reasons for the process
1.数控车床螺杆转速过高，螺杆剪切力过大，预成型背压过大，塑料熔炼过程和筒体摩擦温度造成变色。
1. The screw speed of CNC lathe is too high, the screw shear force is too large, the back pressure of preform is too large, and the plastic melting process and the cylinder friction temperature cause discoloration.
2. 钢瓶和喷嘴的温度过高，特别是对温度敏感的物料。
2. The temperature of cylinder and nozzle is too high, especially for materials sensitive to temperature.
3.注射压力过高，储存时间过长，停机时间过长。塑料原料会分解变色。
3. The injection pressure is too high, the storage time is too long, and the shutdown time is too long. Plastic materials will decompose and change color.
三、原材料原因
III. reasons for raw materials
1. 材料被污染，与其他颜色混合或与混合材料混合。
1. The material is contaminated, mixed with other colors or mixed with mixed materials.
2. 原料水分和挥发性高，应按要求烘干。
2. Raw materials with high moisture and volatility shall be dried as required.
3.着色剂和添加剂选择不当，颜料耐高温分解导致变色，应选择合理的颜料配方进行调整。
3. If the colorant and additive are not properly selected, and the pigment is resistant to high temperature decomposition, resulting in discoloration, a reasonable pigment formula shall be selected for adjustment.
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