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高强钢板冷弯工艺技术分解特点

来源:http://www.jnxxjm.com

【 发布于:2019-05-13 15:27:46 】


(1)由于高强钢板所构成的高刚性型钢具有很大的惯性矩和抗弯模量,特别是由于应用上的请求需求预冲孔后停止冷弯加工消费,会构成资料外表平整度和资料边缘尺寸上的差别,因而请求对该类高强度构造钢板的冷弯孔型的设计中需求多加侧向定位安装,合理设计孔型,合理布置轧辊间隙等,确保进入每道孔型的资料不跑偏并尽可能地消弭资料外表平整度和资料边缘尺寸上的差别对后续冷弯成型外形的影响;另一个突出的特性为:高强度构造钢板的成型回弹现象较严重,回弹会招致呈现弧边,必需依托过弯来修正,且过弯角比拟难控制,需求在消费调试过程中停止调整修正。

(1) Because the high rigid section steel made of high strength steel sheet has great inertia moment and bending modulus, especially because of the requirement of application that the consumption of cold bending process should be stopped after pre-punching, it will make the difference between the data surface smoothness and the data edge size. Therefore, it is requested that more lateral positioning and installation be needed in the design of cold bending pass of this kind of high strength structural steel sheet, so as to design reasonably. Pass, reasonable arrangement of roll clearance, etc., to ensure that the data entering each pass do not deviate and eliminate as much as possible the influence of the difference of data surface smoothness and data edge size on the shape of subsequent cold bending forming; Another prominent feature is that the springback phenomenon of high strength structural steel sheet is serious, and springback will cause arc edge, which must be corrected by over bending and over bending angle. It is difficult to control, and the adjustment and revision of demand are stopped in the process of consumption debugging.

(2)需求较多的成型道次。在辊式冷弯成型过程中主要加工过程为弯曲变形,除产品弯曲角部分有细微减薄外,变形资料的厚度在成型过程中假定坚持不变;在孔型设计时,要留意合理分配变形量,特别是在道,后面几道,变形量不易过大。另外能够运用侧辊和过弯辊,对型材停止预弯,且使型材断面的中性线与废品型材的中性线重合,使型材上下所受的力均衡,从而防止纵向弯曲。假如在加工过程中发现纵向弯曲,可依据实践状况增加局部轧辊,特别留意后面几道。

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(2) More moulding passes are needed. In roll cold bending process, the main processing process is bending deformation. In addition to the slight thinning of the bending angle, the thickness of deformation data is assumed to remain unchanged during the forming process. In pass design, attention should be paid to the rational distribution of deformation, especially in the first and the latter routes, the deformation is not too large. In addition, the side roll and over-bending roll can be used to stop the pre-bending of profiles, and make the neutral line of profiles section coincide with the neutral line of waste profiles, so as to balance the upper and lower forces of profiles, thus preventing the longitudinal bending. If longitudinal bending is found in the process of processing, local rolls can be added according to the actual situation, paying special attention to the following several routes.

其它如运用矫直机停止矫直,变卦机架间距,采用托辊,调整各架次的轧辊间隙等措施均可减小或消弭纵向弯曲。需求留意的是,经过调整各架次的轧辊间隙来减轻纵向弯曲需求有纯熟的技术才行。

Other measures, such as using straightener to stop straightening, changing the distance between racks, using idlers and adjusting the clearance of rolls in various sorties, can reduce or eliminate the longitudinal bending. It should be noted that skilled technology is needed to reduce the need for longitudinal bending by adjusting the roll clearance of each sortie.

(3)辊式冷弯速度的控制,成型辊压力的调整要适宜,尽量减少重复冷弯弯曲疲倦裂纹,并恰当停止光滑和冷却,进一步减少热应力裂纹的产生等,控制弯曲半径,即弯曲半径不能太小,否则产品外表易产生裂纹,针对高强板在冷成形冷弯工艺中呈现的后延性断裂现象,为了满足构造设计请求,倡议在满足资料的力学设计请求的前提下优化截面外形,如增加弯角半径,减小冷弯角或加大截面外形等方式处置也是一种卓有成效的办法。

(3) Controlling the speed of roll cold bending and adjusting the pressure of forming roll should be appropriate, minimizing fatigue cracks in repeated cold bending, stopping smoothing and cooling properly, further reducing the generation of thermal stress cracks, etc. Controlling the bending radius, i.e. the bending radius should not be too small, otherwise the appearance of products is prone to cracks. Aiming at the delayed fracture of high strength sheet in cold bending process. For example, in order to satisfy the requirement of structural design, it is proposed to optimize the section shape on the premise of satisfying the requirement of mechanical design of data, such as increasing the radius of bending angle, reducing the cold bending angle or increasing the section shape.

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