Selection of laser processing parameters for hot stamping tools based on mathematical planning of the experiment

Chichenev, N. A.; Chicheneva, O. N.; Karfidov, A. O.; Pashkov, A. N.

doi:10.17580/cisisr.2021.02.07

Cited by 16 publications

(4 citation statements)

References 8 publications

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“…It is shown in the works [20][21][22][23][24][25] that use of laser hardening of a roll barrel is rather efficient in manufacture of rolling rolls, because it leads to increase of service life of rolls and quality improvement of products. It is provided via creation of an active working layer with high physical and mechanical properties (such as hardness, heat resistance, contact fatigue resistance etc.…”

Section: Goal Settingmentioning

confidence: 99%

Device for two-way cooling of rolls of multi-roll mills during laser hardening

Chichenev¹,

Vasilyev²,

Karfidov³

et al. 2023

cisisr

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Development of the automotive industry, electronics, aviation and other modern branches of science and technology has led to the need to produce thin (up to 0.01 mm thick) and the thinnest (up to 0.001 mm) high-quality band from high-alloy steels, non-ferrous and noble metals, obtained on multi-roll cold rolling mills. One of the main requirements for work rolls is a high and uniform hardness of the surface of the barrel after hardening, which should increase the wear resistance of the working layer, reduce the degree of its damage and, thereby, ensure the high quality of the rolled strip. An effective way to improve the quality of rolls with a diameter of up to 20 mm is surface laser hardening. In laser hardening of rolling rolls, a technological scheme was used, according to which the roll made a screw movement at preset speed relative to a fixed laser beam, which led to formation of a continuous screw track (spiral) of the hardened material on the surface of the roll. The minimal rotational frequency, at which uniformity of the active layer is observed, has been experimentally established, while laser hardening of samples with doublesided water jet cooling turned out to be the most effective. The design of a sprayer device for cooling of rolls during laser processing is proposed, which provides a uniform active layer along the entire barrel length and significantly reduces buckling of rolls. The technology for the manufacture of rolls has been developed, which makes it possible to obtain work rolls for multi-roll mills with high operational resistance, and to improve the technical and economic indicators of production of precision band. Tests of the rolls made of Kh9VMFSh steel after laser hardening on the mill 300 showed reduction in wear by 1.5-2.0 times compared to the standard volume-hardened rolls and reduction in roll consumption from 0.22 to 0.11 kg / t.

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Section: Goal Settingmentioning

confidence: 99%

Device for two-way cooling of rolls of multi-roll mills during laser hardening

Chichenev¹,

Vasilyev²,

Karfidov³

et al. 2023

cisisr

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show abstract

“…This method is characterized by the following advantages [15][16][17][18][19]: provision of high hardness, wear resistance, heat resistance and fatigue strength; possibility of use as a final operation due to absence of buckling and variation of geometrical dimensions of rolls, what allows to reduce machining workability and to improve fabrication accuracy; slight tuning of processing procedures in order to achieve the required parameters of the quenched layer and local hardening of working surfaces; high productivity and possibility of process automation. It is shown in the works [20][21][22], that use of laser hardening of a roll barrel is efficient in the process of work rolls fabrication; it leads to increase of surface life of rolls and quality improvement of products. It is achieved via creation of the active layer with high physical and mechanical parameters (such as hardness, heat resistance, contact fatigue resistance etc.…”

Section: Goal Settingmentioning

confidence: 99%

The effect of laser hardening on the operation resistance of rolls of multi-roll mills and the quality of the rolling strip

Chichenev,

Vasilyev,

Karfidov

et al. 2023

cisisr

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The results of experimental studies of the process of laser hardening of rolls of multi-roll mills during linear and spiral hardening of samples from Kh9VMFSh steel are presented. It was found that during linear laser treatment, the depth of the hardened layer significantly depends on the power of laser radiation and the speed of translational motion of samples; at the same time, it weakly depends on the diameter of the laser beam. Corresponding graphs, which are more convenient for practical use for selection of technological modes of laser processing, have been built. With spiral laser hardening, the surface of axisymmetric parts is subjected to cyclic heating, the number of cycles of which depends on the speed of translational motion and rotation speed. It is established that decrease of the temperature of the surface layers of the part heated by laser radiation practically does not occur due to thermal conductivity at a sufficiently high value of the rotation speed. It is shown that increase of the rotation speed of samples from 1,000 to 10,000 min-1 leads to increase of the depth of the hardened layer from 0.72 to 1.60 mm with a slight enlargement of hardness of the surface layers, while the depth of the hardened layer significantly depends on the speed of translational motion of the samples and their diameter; it should be taken into account when developing technological modes of laser hardening. Pilot-industrial tests of working rolls during rolling of the strip with 0.012×200 mm cross-section, made from L63 brass, showed that the surface purity of the rolled strip increased from the 7 th to the 8 th class of roughness, and the number of breaks decreased by 1.5-1.8 times. When rolling a strip of nickel NP-2 at a 20-roll mill 300, it was found that consumption of rolls that have been subjected to laser processing is 2 times less than consumption of volume-hardened rolls, while transverse thickness has decreased to ± 3 % (compared with ± 5 % during rolling in volume-hardened rolls).

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“…По расчетному значению вынуждающей силы F вс = = 6,2 кН выбираем из каталога площадной вибратор об щего назначения высокого ресурса типа ИВ98Б442, имеющего следующие технические характеристики 5,6…”

Section: результаты исследования и их обсуждениеunclassified

“…Применение вибраторов. URL: https://promvibrator.ru/plo shadochny_vibrator.html (дата обращения 01.11.2022) 5. Вибратор ИВ98Б 42 В. URL: https://yarvibro.ru/catalog/item/iv 98b1185/ (дата обращения 01.11.2022) 6.…”

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Modernization of hopper car for transportation of agglomerate and other materials

Nefedov

Shkurko

Chichenev

et al. 2022

Izv. vysš. učebn. zaved., Čern. metall.

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The paper considers results of the analysis of operability of the transporting equipment at agglomeration shops of the Ural metallurgical enterprises. It was established that during long-term operation of the hopper car for transportation of hot agglomerate, dust settles on its walls, growths of accumulated dust are formed, and the effect of vaulting occurs. Due to compaction and increase in dust layer, useful volume of the hopper car decreases which in turn leads to the need to carry out dangerous work to clean the dust directly inside the hopper car. Manual labor is used for this purpose. Such works are very dangerous for human health due to high dust content and high injury risk. In order to eliminate the problem of vaulting and accumulation of dust on the car walls, it is proposed to use the installation of two vibrating devices of the “False wall” type together with a vibrating neck (vibrating beam). The vibrating element of the device is a plate that is mounted on the inner wall on flexible suspensions (round link chain). Rubber shock absorbers are installed between the plate and the hopper wall, which are used as rubber-fabric conveyor belt. A vibrator is mounted to the plate through the support post, and the transmission of vibrations to the agglomerate is carried out using a vibrating hump, which is welded to the plate (false wall). Introduction of the designed device ensures reduction of unplanned downtime of the hopper cars team and rejection of hazardous to human health work related to the bunkers cleaning. The economic calculation confirms feasibility of the ongoing measures for reengineering of hopper cars in the conditions of agglomerate production at metallurgical enterprises.

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Selection of laser processing parameters for hot stamping tools based on mathematical planning of the experiment

Cited by 16 publications

References 8 publications

Device for two-way cooling of rolls of multi-roll mills during laser hardening

Device for two-way cooling of rolls of multi-roll mills during laser hardening

The effect of laser hardening on the operation resistance of rolls of multi-roll mills and the quality of the rolling strip

Modernization of hopper car for transportation of agglomerate and other materials

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