CN110038931B

CN110038931B - Rolling forming method for U-shaped section type part of automobile high-strength plate

Info

Publication number: CN110038931B
Application number: CN201910327656.7A
Authority: CN
Inventors: 唐子卫; 肖峰
Original assignee: Hubei Tuao Mould Technology Co ltd
Current assignee: Hubei Tuao Mould Technology Co ltd
Priority date: 2019-04-23
Filing date: 2019-04-23
Publication date: 2021-02-05
Anticipated expiration: 2039-04-23
Also published as: CN110038931A

Abstract

The invention provides a roll forming method of a U-shaped section part of an automobile high-strength plate, which adopts a dual-phase steel high-strength plate as a material, prepares a flat plate blank according to the size of the U-shaped section part, adopts roll forming equipment to carry out roll forming, and sequentially forms the steps on the roll forming equipment as follows: (1) forming a flat plate blank in a reverse negative angle; (2) forming 90-degree flanging negative angles on two sides; (4) the bottom is formed to ensure the flatness; (5) two sides of the flange are turned over for 90 degrees and then are formed in the forward direction; (6) and (5) final shaping: and ensuring that the U-shaped section type parts meet the design shape and size requirements. The method changes the thought, reasonably sets the deformation angle through the combination of positive and negative excessive deformation, and finally shapes to meet the design requirements of shape and size, thereby realizing the rolling forming of the U-shaped section parts of the high-strength plate of the automobile, and obtaining the product without springback; moreover, the production efficiency is high, and the labor is saved.

Description

Rolling forming method for U-shaped section type part of automobile high-strength plate

Technical Field

The invention belongs to the field of automobile parts, and particularly relates to a rolling forming method of an automobile U-shaped section part.

Background

The high-strength plate is applied to the automobile body structure, so that the weight of the automobile body can be reduced, fuel oil is saved, and the high-strength plate has important significance for realizing the light weight of the automobile.

However, in the manufacture of automobile parts, many stamping process parts belong to the U-shaped cross section type parts; in order to realize the application of the high-strength plate, a part of U-shaped cross section parts adopt a dual-phase steel high-strength plate with the yield strength of 800MPa-980MPa, but the dual-phase steel high-strength plate has high strength and is easy to rebound and deform by adopting roll forming, so that the prior art generally adopts a separately formed stamping process, namely flanging on two sides, standing for more than 4 hours to eliminate internal stress and shaping, and the process has the characteristics of long process, high production cost and lower production efficiency.

Disclosure of Invention

The invention provides a roll forming method of a U-shaped cross section type part of an automobile high-strength plate, which aims to realize that a dual-phase steel high-strength plate with the yield strength of 800MPa-980MPa is roll-formed into the U-shaped cross section type part by adopting a roll forming device.

In order to achieve the purpose, the invention adopts the following technical scheme: a rolling forming method for a U-shaped section type part of an automobile high-strength plate adopts a dual-phase steel high-strength plate with the yield strength of 800MPa-980MPa as a material, prepares a flat plate blank according to the size of the U-shaped section type part, and performs rolling forming by adopting rolling equipment, and is characterized in that: the sequential forming steps on the rolling device are:

(1) reverse negative angle forming of the flat plate blank: firstly, forming a flat plate blank by a first roller set along the middle position in a left-right symmetrical downward reverse negative angle mode, wherein the negative angle is 3-6 degrees;

(2) forming 90-degree flanging negative angles on two sides: rolling and forming two side flanges by using a second roller set, and ensuring that the angle between the two side flanges and the bottom is 84-87 degrees, namely, the two side flanges are turned inwards for 3-6 degrees in multiple directions;

(4) bottom forming: rolling and forming the bottom by using a third roller set to ensure flatness;

(5) and (3) forward forming of 90-degree turned edges on two sides: rolling and forming two side flanges by using a fourth roller set, and ensuring that the angle between the two side flanges and the bottom is 92-93 degrees;

(6) and (5) final shaping: and rolling and shaping by using a fifth roller set to ensure that the U-shaped section type part meets the design shape and size requirements.

The invention has the beneficial effects that: in order to realize the roll forming of the U-shaped section type part of the high-strength plate, the thought is changed, the deformation angle is reasonably set through the combination of positive and negative excessive deformation, and the part is finally shaped to meet the design requirements of shape and size, so that the roll forming of the U-shaped section type part of the high-strength plate of the automobile is realized, the obtained product does not rebound, and the aim is fulfilled; and moreover, the final product is obtained by one-time sequential forming on one rolling device, the production efficiency is high, and the labor is saved.

Drawings

FIG. 1 is a schematic process flow diagram of the present invention.

Fig. 2 is a front view of a U-section part from fig. 1.

Fig. 3 is a side view of a U-section part from fig. 1.

Fig. 4 is a schematic view of a U-shaped cross-section part with a circular arc reinforcing rib at the bottom.

Detailed Description

The invention is further described below with reference to fig. 1: a rolling forming method for a U-shaped section type part of an automobile high-strength plate adopts a dual-phase steel high-strength plate with the yield strength of 800MPa-980MPa as a material, prepares a flat plate blank according to the size of the U-shaped section type part, and carries out rolling forming by adopting rolling equipment, wherein the sequential forming steps on the rolling equipment are as follows:

(1) reverse negative angle forming of the flat plate blank: firstly, forming a flat plate blank by a first roller set along the middle position in a left-right symmetrical downward reverse negative angle mode, wherein the negative angle A is 3-6 degrees, and the negative angle A is shown in a figure 1 (a);

(2) forming 90-degree flanging negative angles on two sides: rolling and forming two side turnups by using a second roller set, and ensuring that an angle B with the bottom is 84-87 degrees, namely turning 3-6 degrees inwards in multiple directions, as shown in a figure 1 (B);

(4) bottom forming: rolling and forming the bottom by using a third roller set to ensure that the bottom 1 is flat, as shown in a figure 1 (c);

(5) and (3) forward forming of 90-degree turned edges on two sides: rolling and forming two side flanges by using a fourth roller set, and ensuring that an angle C between the two side flanges and the bottom is 92-93 degrees, as shown in a figure 1 (d);

(6) and (5) final shaping: and (4) rolling and shaping by using a fifth roller set to ensure that the U-shaped section part meets the design shape and size requirements, the angles of the flanges at two sides and the bottom are 90 degrees, and the angle is shown in figure 1 (e).

As shown in fig. 2 and 3, which are schematic representations of a U-section part obtained in fig. 1 (e), it can be seen that such a part is U-shaped in cross-section and extends in the longitudinal direction for a certain length L.

As shown in fig. 4, the part is a U-shaped section part with reinforcing ribs at the bottom, and the reinforcing ribs 2 are firstly formed by rolling with a roller set on a rolling device, and are performed before the step shown in fig. 1 (a), and then the process shown in fig. 1 is connected.

The core thought of the invention is as follows: the reversible deformation overcomes the internal stress and the rebound.

In the present invention, the meaning of the U-shaped section type part is: the expression is for such a part that is U-shaped in cross-section.

Claims

1. A rolling forming method for a U-shaped section type part of an automobile high-strength plate adopts a dual-phase steel high-strength plate with the yield strength of 800MPa-980MPa as a material, prepares a flat plate blank according to the size of the U-shaped section type part, and performs rolling forming by adopting rolling equipment, and is characterized in that: the sequential forming steps on the rolling device are:

2. The roll forming method of the U-shaped section part of the automobile high-strength plate as claimed in claim 1, wherein: for the parts with the reinforced ribs on the bottom, firstly, rolling the reinforced ribs by using a roller set, and then, connecting the step (1) to the step (5) in the claim 1.