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耐磨钢板加工硬化提升的特性介绍

所属分类:公司动态 发布时间:2021-05-20 来源:https://www.lcnaimoban.com/ 浏览量:

(1)加工硬化 在塑性形变全过程中,伴随着金属材料內部机构的转变,金属材料的物理性能也将造成显著的转变,即伴随着形变量的提升,金属材料的抗压强度、强度扩大,而塑性变形、延展性降低,这种情况即是加工硬化或变形加强。
(1) In the whole process of plastic deformation, along with the transformation of the internal structure of metal materials, the physical properties of metal materials will also cause significant changes, that is, with the improvement of deformation, the compressive strength and strength of metal materials will expand, while the plastic deformation and ductility will decrease, which is the strengthening of work hardening or deformation.
加工硬化状况在金耐磨钢板原材料加工过程中具备关键的现实意义,现阶段已普遍用于提升金属复合材料的抗压强度。比如自行车链条的传动链条,原材料为Q345 (16Mn)高合金钢,原先的强度为150HBW,抗压强度Rm≥520MPa,历经五次冷轧,不锈钢厚度从3.5mm缩小到1.2mm(形变量为65.7%),这时候强度提升到275HBW,抗压强度提升到贴近1000MPa,这使传动链条的负载工作能力提升了一倍。
The work hardening condition has a key practical significance in the processing of raw materials of gold wear-resistant steel plate. At present, it has been widely used to improve the compressive strength of metal composites. For example, the driving chain of bicycle chain is made of Q345 (16Mn) high alloy steel. The original strength is 150hbw, and the compressive strength is RM ≥ 520mpa. After five times of cold rolling, the thickness of stainless steel is reduced from 3.5mm to 1.2mm (the deformation is 65.7%). At this time, the strength is increased to 275hbw, and the pressure resistance is increased to close to 1000MPa, which doubles the load working capacity of the driving chain.
针对用热处理工艺不可以加强的原材料而言,用加工硬化方式提升其抗压强度就看起来更为关键。如塑性变形非常好而抗压强度较低的铝、钢及一些不锈钢板等,在生产制造上通常做成冷拉棒料或冷轧钢板材供货客户。加工硬化都是一些钢件或半成品加工可以生产加工成型的关键要素。比如冷拔钢丝拉过模孔后,其横断面规格必定减少,而每企业总面积上受到地应力却会扩大,假如金属材料并不是造成了加工硬化而提升抗压强度,那麼不锈钢丝在出模孔后就将会被扯断。
Mn13耐磨板
For the raw materials that can not be strengthened by heat treatment process, it seems more critical to improve their compressive strength by work hardening. For example, aluminum, steel and some stainless steel plates with good plastic deformation and low compressive strength are usually made into cold drawn bars or cold rolled steel plates for customers. Work hardening is the key factor of some steel parts or semi-finished products processing. For example, after the cold drawn steel wire is drawn through the die hole, its cross-section specification must be reduced, but the ground stress on the total area of each enterprise will be expanded. If the metal material does not cause work hardening and improve the compressive strength, then the stainless steel wire will be torn off after the die hole.
因为不锈钢丝经塑性形变后造成了加工硬化,虽然不锈钢丝横断面减缩,但其抗压强度明显扩大,因而便已不再次形变,进而形变迁移到并未拉过模孔的一部分。那样,不锈钢丝能够不断地、匀称地根据模孔而成型。又如金属板材在拉深全过程中,弯角处形变比较严重,造成加工硬化,因而该点形变到一定水平后,接着的形变就迁移到别的一部分,那样便可获得薄厚匀称的五金冲压件。
Because the work hardening of stainless steel wire is caused by plastic deformation, although the cross section of stainless steel wire is reduced, its compressive strength is obviously increased, so it is no longer deformed, and then the deformation changes to a part that has not been pulled through the die hole. In this way, the stainless steel wire can be continuously and evenly shaped according to the die hole. Another example is that in the whole process of deep drawing, the deformation at the bending angle is more serious, resulting in work hardening. Therefore, when the deformation at this point reaches a certain level, the subsequent deformation moves to another part, so that the metal stamping parts with uniform thickness can be obtained.
加工硬化还可提升耐磨钢板铸铁件或预制构件在应用全过程中的安全系数。即便历经精准的设计方案而生产加工出去的零件,在应用全过程中每个位置的支承也不是匀称的,通常会在一些位置出現应力和负载状况,使该点造成塑性形变。假如金属复合材料沒有加工硬化,则该点的形变会愈来愈大,地应力也会愈来愈高,终造成零件的无效或破裂。但正由于金属复合材料具备加工硬化这一特性,故这类有时候负载位置的转变会自主终止,应力还可以自主变弱,进而提升了零件的安全系数。
Work hardening can also improve the safety factor of wear-resistant steel, iron castings or prefabricated components in the whole process of application. Even if the parts are produced and processed through precise design scheme, the support of each position is not symmetrical in the whole process of application, and stress and load conditions usually appear in some positions, causing plastic deformation at this point. If the metal composite material is not work hardened, the deformation at this point will be larger and larger, and the in-situ stress will be higher and higher, resulting in the invalidity or fracture of the parts. However, because of the work hardening characteristic of metal composite materials, sometimes the load position change will terminate automatically, and the stress can also weaken automatically, thus improving the safety factor of parts.
加工硬化状况也对耐磨钢板原材料的生产制造和应用造成一些不好危害。由于金属材料冷塑性变形生产加工到一定水平之后,形变抗力就会扩大,进一步的形变就务必增加机器设备输出功率,提升驱动力耗费。
The work hardening condition also causes some bad harm to the production and application of raw materials of wear-resistant steel plate. Because the metal material cold plastic deformation production processing to a certain level, the deformation resistance will expand, further deformation must increase the output power of machinery and equipment, improve the driving force consumption.
此外,经加工硬化后,金属材料的塑性变形大幅减少,再次形变就会造成裂开。以便清除这类硬底化状况便于再次开展冷形变生产加工,正中间必须开展加工硬化淬火解决。
In addition, after work hardening, the plastic deformation of metal material is greatly reduced, and the second deformation will cause cracking. In order to remove this kind of hard bottom condition, and to carry out cold deformation again, work hardening and quenching must be carried out in the middle.
(2)冷塑性变形生产加工对别的特性的危害经冷塑性变形生产加工后,耐磨钢板原材料的工艺性能和有机化学特性也将产生显著转变。以使金属材料及铝合金的比电阻器扩大,导电率能和电阻器溫度指数降低,导热系数也稍微降低。冷塑性变形生产加工还使导磁率、磁对比度降低,但涡流损耗和矫顽力扩大。冷塑性变形生产加工提升金属材料的机械能,使其有机化学特异性提升,浸蚀速率加速。冷塑性变形生产加工后因为金属材料中的晶体缺陷(位错及位置)提升,因此使其外扩散激活能减少,外扩散速率加速。
(2) The harm of cold plastic deformation processing to other properties after cold plastic deformation processing, the process properties and organic chemical properties of wear-resistant steel plate raw materials will also have a significant change. In order to enlarge the specific resistance of metal materials and aluminum alloy, the conductivity energy and temperature index of the resistor are reduced, and the thermal conductivity is also slightly reduced. However, the eddy current loss and coercivity increase. Cold plastic deformation can improve the mechanical energy of metal materials, enhance the organic chemical specificity and accelerate the etching rate. After cold plastic deformation, the activation energy of external diffusion is reduced and the external diffusion rate is accelerated because of the increase of crystal defects (dislocation and position) in metal materials.
 
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