冷铁
英文名称：chill
1、简介
隔离是什么
产品名称：冷铁
制造工艺：冲压，成形，锻造，车削，铸造或焊接
其它名称：内外冷铁，插片冷铁，冷却钉，螺旋状内冷铁，马蹄钉和铸造钉
冷铁由镀锡或涂敷防粘膜稀浆的低碳钢或线材加工而成，并且可以加 工成各式各样的形状和尺寸。无论是马蹄钉还是直杆钉都可以作为冷 铁使用。在铸造生产中，冷铁被用来控制收缩和获得定向凝固。外冷铁放在模子中顶着铸件壁。内冷铁被压进型芯，或模壁，这样它们的一大部分就可以伸进模穴，从而达到预期的效果。
1, Introduction
Product Name: cold iron
Manufacturing process: stamping, forming, forging, machining, casting or welding
Other names: internal and external iron chill, inrt the cold iron nail, cooling, helical internal chill casting, horshoe nails and nail
Cold iron tin or coated by anti mucosal slurry of low carbon steel or wire processing, and can be procesd into every kind of shape and size. Both nail or nail straight rod can be ud as cold iron. In foundry production, cold iron is ud to control the shrinkage and directional solidification. Cold iron on the top wall of mold casting. The cold iron is presd into the core, or die wall, so one of their most can into the mold cavity, so as to achieve the desired effect.
2分类
为增加铸件局部冷却速度，在型腔内部及工作表面安放的金属块称为冷铁。冷铁分为内冷铁和外冷铁两大类。放置在型腔内能与铸件熔合为一体的金属激冷块叫内冷铁。造型（芯）时放在模样（芯盒）表面上的金属块叫外冷铁。
2 Classification
In order to increa the cooling rate of castings in local, metal block cavity placed inside and the working surface is called cold iron. Cold iron is divided into internal
chill and cold iron two categories. Metal induced is placed in the cavity and casting fusion as one of the cold block called the cold iron. Other (core) on appearance (box) the piece of metal called cold iron on the surface.
作用：
石墨冷铁
铸造生产中，冷铁对提高冒口的作用和防止铸件产生缩孔、缩松，保证铸件质量起着较为重要的作用，在消失模铸造中完全可以和普通铸造法一样地使用冷铁。外冷铁可在舂砂时放入；内冷铁可在制模时嵌入或粘合在模型地内部，也可将外冷铁延伸到型外，固定在砂型中。内外冷铁安放原则与冷铁种类、规格与普通铸造相似。
Effect:
Graphite chills
Casting production, to improve the cold iron rir and prevent casting shrinkage h
ole, shrinkage porosity, ensure casting quality plays a more important role, in lost foam casting can be completely and common casting method using cold iron. External cooling in sand water could add; inner cooling could embedded or bonding within the model in modeling, can also be extended to the outside cold iron, fixed in the sand. Internal and external iron chill placed principle and cold iron species, specifications and common casting similar.
一 在冒口难于补缩的部位防止缩孔 缩松。
二 防止壁厚交叉部位及急剧变化部位产生裂纹。
三 与冒口配合使用，能加强铸件的顺序凝固条件，扩大冒口补缩距离或范围，减少冒口数目或体积。
四 用冷铁加速个别热节的冷却，使整个铸件接近于同时凝固，既可防止或减轻铸件变形，又可提高工艺出品率。
五 改善铸件局部的金相组织和力学性能。如细化基体组织，提高铸件表面硬度和耐磨性。简笔画>四时田园杂兴教案
六 减轻和防止厚壁铸件中的偏析。
冷铁的作用是加速铸铁件某部分在浇注过程中的冷却速度的。铸铁件因为其结构的需要造成各个部分壁厚不均，有的部位很厚，在冷却的过程中就冷却的慢，壁厚薄的部位就冷却的快，使得同一个铸件各个部位冷却速度不均。造成的结果有可能产生缩孔、或者把壁薄的部位拉裂。为了避免这种现象的产生，造型完成后，就在壁厚厚的部位加放冷铁，用它来吸收铁水的温度，加速这个部位的冷却速度，缩短和其他壁厚薄的部位冷却的时间差。
1. in the rir feeding position to prevent shrinkage.
2. prevention and rapid change cross site wall thickness parts crack.
3. 复核理由 and the rir with the u, can strengthen the solidification condition order, expand the feeding distance or range, reduce the number or size of rir.
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4. cold iron accelerated individual hot spot cooling, the casting near simultaneous solidification, which can prevent or reduce casting deformation, and can improve the process yield.
5. 良言如春作文The microstructure and mechanical properties of local area of the casting is improved. Such as refining matrix organization, improve casting surface hardness and wear resistance.
要求高的英语6. reduce and prevent the gregation of thick walled castings.
The chill effect is accelerated iron parts in the casting process of the cooling rate. Cast iron becau of the need of its structure caud by uneven wall thickness of each part, some area is very thick, then cooled in the cooling process of slow, wall thickness of the part cooling fast, makes the same casting parts of uneven cooling speed. The result is likely to produce the shrinkage, or thin wall parts crack. In order to avoid the emergence of this phenomenon, modeling is completed, the thick wall parts add the cold iron, u it to absorb the hot metal temperature, speed of cooling speed this site, shortening and other part of the cooling wall thickness of the time difference.
3、使用经验
善于利用冷铁，包括内冷铁与外冷铁，它既细化一次结晶，消除缩孔、缩松，又提高工艺出品率，当然，适宜的用量和规格是应该考虑的。内冷铁要干净、易熔，用量以少为宜。外冷铁的三维尺寸与冷却物的三维尺寸为0。6－0。7倍的函数关系。过小不起作用，过大造成铸件开裂。铸件在型内要长时间保温，直到低于200℃再开箱。
中小铸件的冷铁使用过程中：
1、中小铸件不便使用内冷铁
2、外冷铁使用在非加工面比较好，而且要刷醇基涂料、使用前抛丸除锈、除水和油
3、侧冷铁出现的问题比较少，效果比端冷铁好
4、端冷铁厚度为铸件厚度1/8~1/4时，激冷效果不好，而且冷铁边沿有缩陷，只能用于小缩孔和缩松
5、端冷铁厚度为铸件厚度1/4~1/2时，激冷效果一般，有时冷铁边沿有缩陷，冷铁面中间也可能有缩陷，并开始出现气孔
6、端冷铁厚度大于铸件厚度1/2时，激冷效果好，冷铁面中间有缩陷，铸件经常有气孔，厚冷铁不可用于高牌号铸铁件，因为易出现局部高硬度。
7、冷铁的非铁水接触面做成空的，有利于消除气孔。
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3, The u of experience
Good at using cold iron, including the cold iron and cold iron, it is refined a crystallization, eliminate the shrinkage hole, shrinkage porosity, and increa the process yield, of cour, the suitable dosage and specifications should be considered. The cold iron to clean, fusible, amount to little advisable. 6－0. Function 7 times. Don't work too small, too much cau casting crack. Don't work too small, too much cau casting crack. Casting in the mold to heat prervation for a long time, until less than 200 ℃ and then out of the box.
