Simulation of Process Hole Forming Performance for U-Channel Part of Tailor Rolled Blank

doi:10.12068/j.issn.1005-3026.2024.08.003

Abstract

Abstract:

Finite element simulations were used to analyze the influences of the position， number， size， and shape of process holes on the forming performance of cold stamping tailor rolled blank U?channel parts. The results indicated that tailor rolled blanks are advantageous in reducing residual stresses in the sidewalls when holes are positioned in the thin zone of the sidewalls. The springback of the tailor rolled blank was found to be less dependent on the distribution of process holes but more influenced by their number， radius， and shape. From the standpoint of forming performance and springback impact， it is preferable to locate process holes in the thick zone and transition zone areas at the end of the U?channel part of the tailor rolled blank. If holes must be drilled in the sidewall， the thin zone area is the preferred location. In adjacent areas， the number of process holes should ideally not exceed two， with smaller sizes being more suitable. A shorter distance along the rolling direction is also preferred for the shape of the process hole.

Key words: tailor rolled blank（TRB）, process hole, U?channel part, cold stamping, forming performance, springback

CLC Number:

TG 156.2

Xian-lei HU, Yong-sheng ZHU, Ying ZHI. Simulation of Process Hole Forming Performance for U-Channel Part of Tailor Rolled Blank[J]. Journal of Northeastern University(Natural Science), 2024, 45(8): 1080-1087.

Figures/Tables 17

Fig. 1 TRB size (unit: mm)

Fig. 2 TRB mold

Fig. 3 Variation curves of mechanical properties of TRB with thickness

Fig. 4 Schematic diagram of process hole location distribution

Fig. 5 Measurement method of springback

Fig. 6 Comparison of experimental and simulation results

Table 1 Comparison of the simulated value and

差厚板区域	$Δ z ˉ / m m$			误差/%
差厚板区域	模拟值	实验值	差值	误差/%
薄区	8.22	8.71	0.49	5.96
厚区	9.43	9.62	0.19	2.01

Table 1 Comparison of the simulated value and

差厚板区域	$Δ z ˉ / m m$			误差/%
差厚板区域	模拟值	实验值	差值	误差/%
薄区	8.22	8.71	0.49	5.96
厚区	9.43	9.62	0.19	2.01

Fig. 7 Stress distribution in unopened and opened TRB

Fig. 8 The amount of springback and offset in the unopened and opened TRB

Fig. 9 Stress distribution of TRB sidewall opening holes

Fig. 10 Springback distribution corresponding to different hole positions in the TRB transition zone sidewalls

Fig. 11 Springback distribution corresponding to TRB end hole position

Fig. 12 The numbers of opening holes in the TRB transition zone sidewall center

Fig. 13 Springback distribution vs. process hole numbers in the TRB transition zone sidewall center

Fig. 14 Springback distribution vs. hole size in the TRB transition zone sidewall center

Fig. 15 Opening hole shape in the TRB transition zone sidewall center

Fig. 16 Springback distribution vs. opening hole shape in the TRB transition zone sidewall center

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