Experimental validation of a reconfigurable guillotine shear and bending press machine

Figures & data

Figure 1. Flow chart for the evaluation of the RGS&BPM.

Figure 2. The reconfigurable guillotine shear and bending press machine for cutting and bending operations.

Figure 3. Cutting operation of aluminium sheet fig. 3b: Bending operation of the aluminium sheet.

Figure 4. The bent aluminium sheet at different angles (30–90°) (a): 30° (b): 45° (c): 60° (d): 90°.

Table 1. Properties of the aluminium 7075 T7 (Surya, 2023)

Mechanical Properties	Value
Young’s Modulus (GPa)	70
Tensile strength (MPa)	410
Ultimate tensile strength (MPa)	500
Shear strength (MPa)	320
Elongation at break (%)	9.3
Brinell’s hardness (BHV)	140
Fatigue strength (MPa)	160
Poisson’s ratio	0.32
Thermal Properties
Thermal conductivity (W/m-K)	130
Specific heat capacity (J/kg-K)	870
Thermal expansion coefficient ($\mathit{\mu m}/\mathit{m}-\mathit{K}$)	23

Table 2. Bending and cutting angles with the corresponding time taken for the operations

S/N	Bending and cut angles (degrees)	Average bending time (sec)	Average cutting time at 25 mm back gauge (sec)	Total bending and cutting time for the RGS&BPM (sec)
1.	90	32.49	105	137.49
2.	60	24.74	105.5	130.24
3.	45	19.57	106	125.57
4.	30	16.39	115	131.39

Table 3. The springback factor for bending operations

S/N	Bending angles (degrees)	Bending forces (kN)	Final bent angle (degrees)	Bending radius (mm)	Final bent radius (mm)	Springback factor
1.	90	5	78	2	1.70	1.15
2.	90	10	81	2	1.77	1.11
3.	90	15	80	2	1.75	1.13
4.	60	5	49	2	1.64	1.22
5.	60	10	52	2	1.70	1.15
6.	60	15	51	2	1.69	1.18
7.	45	5	33	2	1.60	1.36
8.	45	10	38	2	1.65	1.18
9.	45	15	36	2	1.63	1.25
10.	30	5	21	2	1.51	1.43
11.	30	10	24	2	1.55	1.25
12.	30	15	23	2	1.54	1.30

Figure 5. Average time taken for the bending and cutting operations.

Figure 6. The effect of the variation in the bending angles on the final bent angles and the springback.

Figure 7. The effect of the variation in the bending forces on the final bent angles and the springback.

Table 4. Comparative analysis of the total time taken for the cutting and bending operations of the RGS&BPM and the traditional machines

S/N	Bending angles (degrees)	Total bending and cutting time for the RGS&BPM (sec)	Total bending and cutting time for the traditional machines (sec)	% difference
1.	90	137.49	335.67	59.04
2.	60	130.24	324.56	59.87
3.	45	125.57	315.71	60.22
4.	30	131.39	317.89	58.66

Table 5. Effect of the backgauges on the time for the cutting operation for the RGS&BPM

S/N	Backgauges (mm)	Cutting time (sec)
1.	15	116
2.	20	110
3.	25	96
4.	30	97
5.	35	103
6.	40	104

Surya, M. S. (2023). Fabrication, interlayer bonding and mechanical characterization of four layered AA7075/SiC functionally graded material. Silicon, 15(10), 1–8. https://doi.org/10.1007/s12633-023-02379-6

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