Non alloy plastic mold steel:

由于碳素钢具有便宜、加工性能好，元料来源方便等优点，因此对于制造形状简单的小型塑料模具或精密度要求不高、使用寿命不需要很长的塑料模具,多采用这类钢制造。

Because carbon steel has the advantages of low price, good processing performance and convenient source of raw materials, it is often used to manufacture small plastic molds with simple shape or plastic molds with low precision and long service life.

对于形状较简单的、小型的热固性塑胶模具,由于要求较高的耐磨性一般用T7、T8、T9、T10、T11、T12等碳素工具钢制造。

For small thermosetting plastic molds with simple shape, they are generally made of carbon tool steels such as T7, T8, T9, T10, T11 and T12 due to their high wear resistance.

渗碳行塑胶模具钢：

Carburized plastic mold steel:

渗碳行塑胶模具钢的含碳量一般都在0.1%-0.25%范围内，退火后硬度较低，具有良好的切削加工性能,切削加工成型的模具渗碳后经淬火，低温回火后不仅具有较高的强度，而且心部具有较好的韧性，模具的表面高硬度、高耐磨性、亦可以保证良好的抛光性能。另一优点是塑性好，可以采用冷挤压成型法制造模具，无需进行切削加工，对于大批量生产同一性状的模具有利。缺点是模具热处理工艺较复杂、变形大。

The carbon content of carburized plastic mold steel is generally in the range of 0.1% - 0.25%. After annealing, the hardness is low and has good cutting performance. The machined mold after carburization, quenching and low-temperature tempering not only has high strength, but also has good toughness in the heart. The surface of the mold has high hardness, high wear resistance and good polishing performance. Another advantage is good plasticity. Cold extrusion molding can be used to manufacture molds without cutting, which is beneficial to mass production of molds with the same properties. The disadvantage is that the die heat treatment process is complex and has large deformation.

预硬型塑胶模具钢：

Pre hardened plastic mold steel:

预硬型塑胶模具钢是指将热加工的模块，预行调质处理，以获得所要求的使用性能，在进行刻模加工，待模具成型，不再进行终热处理就可以直接使用。从而避免由于热处理而引起的模具变形和裂纹问题。预硬化钢适宜制作形状复杂的大、中型精密塑料模具，预硬化钢的使用硬度一般在30-42HRC范围内，尤其是在高硬度区（36-42HRC），可切削性能较差。

Pre hardened plastic mold steel refers to the pre quenching and tempering treatment of the hot processed module to obtain the required service performance. It can be used directly after the mold is engraved and formed without final heat treatment. So as to avoid die deformation and crack caused by heat treatment. Pre hardening steel is most suitable for making large and medium-sized precision plastic molds with complex shapes. The service hardness of pre hardening steel is generally in the range of 30-42hrc, especially in the high hardness area (36-42hrc), and the machinability is poor.

耐腐蚀型塑胶模具钢：

Corrosion resistant plastic mold steel:

耐蚀钢主要用在生产以化学性腐蚀塑料（如聚氧乙烯或聚苯乙烯 添加抗燃剂等）为原料的塑胶制品的模具。

Corrosion resistant steel is mainly used in the production of plastic products with chemically corrosive plastics (such as polyoxyethylene or polystyrene with flame retardant, etc.) as raw materials.

整体淬硬型塑胶模具钢：

Integrally hardened plastic die steel:

用于压制热固性塑料、交合强化塑料（如尼龙型强化或玻璃纤维强化塑料）产品的模具，以及生产批量很大，要求模具使用寿命很长的塑胶模具，一般选用高淬透性的冷作模具钢和热作模具钢材料制造，这些材料通过终热处理，可保证使用状态具有高硬度、高耐磨性和长的使用寿命。

Molds for pressing thermosetting plastics and cross reinforced plastics (such as nylon reinforced plastics or glass fiber reinforced plastics) and plastic molds with large production batch and long service life of molds are generally made of high hardenability cold working die steel and hot working die steel materials. These materials can ensure high hardness in service state through final heat treatment High wear resistance and long service life.

影响塑胶模具钢镜面加工性能的因素：

Factors affecting the mirror processing performance of plastic mold steel:

生产透明塑胶制品，尤其是光学仪器（如透视镜等），对于成型模具的镜面加工性能要求很高。但严格的将，没有专用牌号的镜面加工用塑胶模具钢。

The production of transparent plastic products, especially optical instruments (such as perspective mirrors, etc.), requires high mirror processing performance of forming molds. But strictly, there is no special brand of plastic mold steel for mirror processing.

影响模具镜面加工性能一般有如下几方面的因素：

The following factors generally affect the mirror processing performance of the die:

（1）钢材的冶金质量钢中的非金属夹杂物、气泡、氧化物、硫化物等是影响模具钢镜面抛光和研磨时形成针眼和孔洞的主要原因： 因此，凡是表面粗糙度要求很高的塑胶模具，一般不得采用加硫的易切削钢：即是不是易切削钢，若钢中氧化物，硫化物夹杂含量较高，在研磨过程中也容易脱落形成针孔。所有，采用针孔冶炼或电渣重熔等工艺，将有效地提高钢的纯净度，从而提高钢材的抛光性能。

(1) The metallurgical quality of steel, non-metallic inclusions, bubbles, oxides and sulfides in steel are the main reasons affecting the formation of pinholes and holes during mirror polishing and grinding of die steel: therefore, for plastic molds with high surface roughness requirements, sulfur free cutting steel shall not be used: that is, whether it is free cutting steel, if there are oxides in the steel, The content of sulfide inclusions is high, and it is easy to fall off and form pinholes during grinding. All, the use of pinhole smelting or electroslag remelting will effectively improve the purity of steel and improve the polishing performance of steel.

（2）钢中的组织不均度也是影响抛光性能的另一个原因。 显微区域组织的不均匀，加带状偏析等可能使得钢材在镜面加工时出现很细的发纹和研磨斑、坑等缺陷，萎了防止偏析，必须掌握好出钢后的浇注技术和钢锭的结晶质量，另外要进行充分锻造，以保证钢材的致密度，如果能进行均匀化热处理或电渣重熔冶炼，也可以有效地减少这种偏析，从而提高钢的抛光性能。

(2) The non-uniformity of microstructure in steel is another reason affecting the polishing performance. Uneven microstructure and banded segregation may cause fine hair lines, grinding spots, pits and other defects of steel during mirror processing, so as to prevent segregation. It is necessary to master the pouring technology and ingot crystallization quality after tapping, and fully forge to ensure the density of steel. If homogenization heat treatment or electroslag remelting smelting can be carried out, It can also effectively reduce this segregation and improve the polishing performance of steel.

（3）钢的硬度高，对镜面抛光性能有好的影响。

(3) The high hardness of steel has a good effect on mirror polishing performance.

（4）抛光技术为了得到比较低的表面粗糙度，抛光技术也起着很大的作用。列如，在预研磨时应避免表面受到可能引起的组织变化的温度的影响。因此，除了足够的冷却意以外，选择正确的砂轮是非常重要的。研磨压力在此起到很大作用，而且当砂轮涂脏时压力会意外地升高，从而引起温度升高。较好的办法是研磨表面时经常改变研磨的方向。抛光用金刚石泥膏进行，这样能得到的抛光结果。抛光时要避免表面接角压力过高，否则较软的基体会被冲蚀，结果是碳化物游离出来，随后开裂，并留下缺陷。在换成叫细粒度时就必须将手和工件弄干净。当然对每种粒度都应采用一种专门的抛光工具。抛光面大多用肉眼判断。但是。含镍的材料由于相应的色调，表面往往显示比较实际情况更好，容易导致判断错误。

(4) Polishing technology in order to obtain relatively low surface roughness, polishing technology also plays a great role. For example, during pre grinding, the surface shall be protected from the temperature that may cause tissue changes. Therefore, in addition to sufficient cooling, it is very important to select the correct grinding wheel. Grinding pressure plays an important role here, and when the grinding wheel is dirty, the pressure will rise unexpectedly, resulting in an increase in temperature. It is better to change the grinding direction often when grinding the surface. It is best to polish with diamond paste, so that the best polishing results can be obtained. When polishing, avoid too high surface corner pressure, otherwise the softer matrix will be eroded, resulting in free carbide, subsequent cracking and defects. When changing to fine grain, hands and workpieces must be cleaned. Of course, a special polishing tool should be used for each particle size. The polished surface is mostly judged by the naked eye. But. Due to the corresponding hue, the surface of nickel containing materials often shows better than the actual situation, which is easy to lead to wrong judgment.

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