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2022

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12

Application of rolling parts technology


  Application of rolled parts in roll production

  The rolling characteristics of martensitic ultra-high-strength steel were studied, and theoretical research and product development were carried out in combination with actual automobile door sill parts. The material thickness was reduced from 2.0mm to 1.4mm without reducing the performance of the part, and the weight was reduced by 35%. Successfully realized the rolling parts manufacturing of door sill parts.

 

Rolled parts

  Rolled parts Compared with other processes such as stamping, the rolling process can achieve smaller bending radii without cracking the material. The roll shape of threshold reinforced roll forming is designed, the finite element analysis model of martensitic ultra-high strength steel roll forming is established, the mechanism of edge wave generation is analyzed, and the edge wave defects are optimized and solved by combining finite element analysis.

 

  Calculation and control of pressure rebound of rolled parts is the key technology of advanced high strength steel. The initial springback compensation value was obtained by using the empirical formula, which was corrected in combination with the actual test, and a better springback compensation was obtained. Solutions are given for bending, twisting, notch deformation and pre-punching deformation. In order to meet the requirements of dimensional accuracy, the roll forming process test of ultra-high strength steel was carried out, and typical parts meeting the requirements of dimensional accuracy were prepared.

 

  Rolling parts introduce advanced roll technology at home and abroad

 

  The cold chain industry is faced with the common requirements of enterprise technology upgrading and product transformation. To adapt to this situation, BRFM has cooperated with domestic and foreign companies to develop the following new technologies and apply them to actual products.

 

  Key technology of flexible roll system design for rolled parts

 

  The shape of many cold formed products is based on a U shape. This category includes square and rectangular tubes of various sizes. Similar products have various specifications and account for a large proportion. In addition to using different material strengths, it can also meet different plate thickness requirements, different side leg heights, and different web widths. If you follow the conventional roller mold design method, you need to replace a set of molds of the corresponding size. This not only results in a large investment in mold costs, but also requires replacement of molds every time product specifications are changed. For the roller device designed by the traditional method, the investment in the mold is several times that of the equipment. The more specifications, the higher the cost of the mold.

 

  Overcoming the limitations of traditional rolling parts design and seeking a flexible roll system that can use a set of rolls to realize the production of long beam products with different thicknesses and specifications has become a key technology that the industry needs to break through. BRFM has mastered the key design technology of the flexible roll forming line system through the research on the rolling forming process of automobile rails, carried out process research and data analysis, and provided technical support for the construction of the flexible roll forming line database and control parameters of the servo control system.

 

  A design method of a flexible roll system with intersecting and fixed outer straight lines is proposed, which can meet the requirements of complete sharing of roll lines, high precision, and easy servo adjustment. The main technical features of the method are as follows:

 

  The forming method of "the straight lines on both sides of the angle converge to the fixed point" has solved the problem of precise forming of products directly formed by a set of roller molds with various longitudinal beams and square rectangular tubes, greatly reducing the cost of molds and future production. The time and cost of changing molds and adjusting molds when products are changed.

 

  The law of the flexible rolling system when the plate thickness changes is summarized, and the geometric relationship is obtained, which lays the foundation for the realization of the servo precision adjustment database in the future.