Method for manufacturing rollforming frame, and rollforming frame

A method for manufacturing a rollforming frame, comprising the following steps:

• step 1:
• separately rolling and bending a first end and a second end of a plate to separately form a first vertical wall and a first horizontal wall, at the first and the second end respectively, connected to the first vertical wall at each end of the plate, wherein a bottom plate is formed between the first vertical walls at the first end and the second end;
• step 2:
• at both ends of the plate, rolling and bending an end of the first horizontal wall adjacent to the first vertical wall to form a stepped bent structure;
• step 3:
• at both ends of the plate, rolling and bending the first horizontal wall to form a second vertical wall, a second horizontal wall, and a third horizontal wall, wherein the second vertical wall, the second horizontal wall, and the third horizontal wall are connected;
• step 4:
• at both ends of the plate, rolling and bending the second horizontal wall to form a third vertical wall and a fourth horizontal wall connected to each other;
• and rolling and bending the third horizontal wall to form a fourth vertical wall and a fifth horizontal wall connected to each other, wherein the fourth vertical wall abuts against the first vertical wall;
• step 5:
• at both ends of the plate, performing laser welding on a joint of the fourth vertical wall and the first vertical wall, wherein a first cavity is formed at the first end of the plate, and a second cavity is formed at the second end of the plate;
• step 6:
• at both ends of the plate, rolling and bending an end of the fifth horizontal wall away from the fourth vertical wall to form a connecting edge and a sixth horizontal wall connected to each other;
• step 7:
• at both ends of the plate, rolling and bending the sixth horizontal wall to form a fifth vertical wall and a seventh horizontal wall connected to each other, wherein the connecting edge abuts against the second vertical wall;
• and
• step 8:
• at both ends of the plate, performing the laser welding on a joint of the connecting edge and the second vertical wall, wherein a third cavity is formed at a first end of the plate, and a fourth cavity is formed at a second end of the plate,
• wherein in the step 1, a first bend structure is formed between the first vertical wall and the bottom plate, and a second bend structure is formed between the first horizontal wall and the first vertical wall;
• in the step 2, a third bend structure and a fourth bend structure are formed in the stepped bent structure at both ends;
• in the step 3, each of two ends of the second horizontal wall are connected to the stepped bent structure and the second vertical wall respectively, a fifth bend structure is formed between the second horizontal wall and the second vertical wall, and a sixth bend structure is formed between the second vertical wall and the third horizontal wall;
• in the step 4, a seventh bend structure is formed between the third vertical wall and the fourth horizontal wall, and each of two ends of the fourth horizontal wall are connected to the stepped bent structure and the third vertical wall respectively;
• at both ends of the plate, an eighth bend structure is formed between the fourth vertical wall and the fifth horizontal wall, and each of two ends of the fourth vertical wall are connected to the fifth horizontal wall and the second vertical wall respectively;
• in the step 6, a ninth bend structure is formed between the connecting edge and the sixth horizontal wall;
• and
• in the step 7, a tenth bend structure is formed between the fifth vertical wall and the seventh horizontal wall, and each of two ends of the fifth vertical wall are connected to the connecting edge and the seventh horizontal wall respectively, and wherein the step 1 comprises the following steps:
• step 1.1:
• separately rolling and bending both ends of the plate to form a first side edge structure and a second side edge structure at the two opposite ends of the plate respectively, wherein the bottom plate is formed between the first side edge structure and the second side edge structure, a first corner structure is formed between the first side edge structure and the bottom plate, and the second corner structure is formed between the second side edge structure and the bottom plate;
• step 1.2:
• at both ends of the plate, separately rolling and bending the first side edge structure and the second side edge structure to form the first vertical wall and the first horizontal wall;
• and
• step 1.3:
• at both ends of the plate, rolling and bending the first vertical wall and the first horizontal wall for multiple times, reducing an angle of the first corner structure to form the first bend structure, and reducing an angle of the second corner structure to form the second bend structure.