CN113118275A

CN113118275A - Cylindrical ultra-deep aluminum alloy fender superplastic forming process method

Info

Publication number: CN113118275A
Application number: CN201911407531.1A
Authority: CN
Inventors: 张晓胜; 闫彦; 刘鑫; 李航; 李莹娜; 李军; 董向坤; 陈雪元; 刘健; 贾晓峰
Original assignee: FAW Group Corp
Current assignee: FAW Group Corp
Priority date: 2019-12-31
Filing date: 2019-12-31
Publication date: 2021-07-16

Abstract

The invention discloses a process method for superplastic forming of a cylindrical ultra-deep aluminum alloy fender, belongs to the technical field of metal material processing and forming, and aims to solve the problem that the conventional processing process method cannot use a metal material to process and form an ultra-deep part with the part depth of more than 350 mm.

Description

Cylindrical ultra-deep aluminum alloy fender superplastic forming process method

Technical Field

The invention belongs to the technical field of metal material processing and forming.

Background

The fender part structure of traditional red flag motorcycle type is drum ship formula spatial structure, there is the negative angle all in three directions, the part degree of depth is more than 350mm, it can't use metal material machine-shaping to have led to the fact this part always, but the glass steel material of having adopted easy processing relatively, and all be not as good as metal material in all aspects between the automobile body of fender of glass steel material and metal material, consequently, how to use this kind of drum formula ultra-deep aluminum alloy fender of metal material processing is the technical problem that needs to solve at present.

Disclosure of Invention

In order to solve the problem, the invention provides a cylindrical ultra-deep aluminum alloy fender superplastic forming process method which comprises the following specific steps:

1) preparing a press machine, an inflatable device and a temperature control system; the press machine is a common hydraulic press 1000T; the gas expansion device is a device capable of adjusting the gas outlet pressure of the liquid nitrogen gas bottle; the temperature control system has heating, heat preservation and cooling function systems.

2) Spraying a layer of graphite on the surface of a preformed mold, and heating the preformed mold to 450 ℃;

3) spraying graphite on the front and back surfaces of an aluminum alloy plate, and putting the plate into a pre-forming die when the temperature of the pre-forming die reaches 450 ℃;

4) heating the pre-forming die and the plate material together to 475 ℃, and carrying out hot forming to produce a hot forming process piece;

5) and continuously controlling the temperature at 475 ℃, enabling the press machine to downwards punch at the downward pressing speed of 10mm/S, simultaneously opening an air expansion device to fill nitrogen into the preformed die, enabling the hot forming process piece to be pasted on the upper die of the preformed die when the air pressure is 0.6Mpa and the forming time is 30 +/-10 minutes, completing the reverse expansion forming to generate a pre-superplastic process piece, and enabling the central forming depth of the plate to reach 250 mm.

6) And (3) spraying graphite on the surfaces of the final superplastic die and the pre-superplastic process piece, integrally heating to 475 ℃, and enabling the pre-superplastic process piece to be filmed to the lower die of the final superplastic die within 50 +/-10 minutes under the condition that the air pressure is 0.4-0.6Mpa, so as to finish the final superplastic forming process piece, wherein the forming depth reaches 110mm, and the integral forming depth of the piece reaches 360 mm.

7) And laser cutting, namely performing laser cutting on the final superplastic forming process part to obtain the shape of a product, and performing alkali washing and acid washing on the surface of the product to obtain the cylindrical ultra-deep aluminum alloy fender.

The invention has the beneficial effects that:

according to the invention, through a two-step superplastic forming mode, the forming depth of the center of the plate reaches 250mm in the first step, and the forming depth of the plate reaches 360mm in the second step, so that the problem of ultrahigh deep drawing of metal products is solved, the problem that the cylindrical ultra-deep aluminum alloy fender cannot adopt a product made of a metal material due to the structure of the cylindrical ultra-deep aluminum alloy fender is solved, and metal forming can be realized through the process.

Drawings

FIG. 1 is a schematic structural view of a cylindrical ultra-deep aluminum alloy fender;

FIG. 2 is a view showing a structure of a hot-formed work piece;

FIG. 3 is a view showing a structure of a pre-superplastic forming process part;

FIG. 4 is a drawing of a sheet resulting from final superplastic forming;

fig. 5 is a cylindrical ultra-deep aluminum alloy fender product.

Detailed Description

The technical solution of the invention is further explained and illustrated in the form of specific embodiments.

A cylindrical ultra-deep aluminum alloy fender superplastic forming process method comprises the following specific steps:

Claims

1. A cylindrical ultra-deep aluminum alloy fender superplastic forming process method comprises the following specific steps:

1) preparing a press machine, an inflatable device and a temperature control system; the press machine is a common hydraulic press 1000T; the gas expansion device is a device capable of adjusting the gas outlet pressure of the liquid nitrogen gas bottle; the temperature control system has a heating, heat preservation and cooling function system;

5) continuously controlling the temperature at 475 ℃, enabling the press machine to downwards punch at the downward pressing speed of 10mm/S, simultaneously opening an air expansion device to fill nitrogen into the preformed die, enabling the hot forming process piece to be pasted on an upper die of the preformed die when the air pressure is 0.6Mpa and the forming time is 30 +/-10 minutes, completing the reverse expansion forming to generate a pre-superplastic process piece, and enabling the central forming depth of the plate to reach 250 mm;

6) spraying graphite on the surfaces of a final superplastic die and a pre-superplastic process piece, integrally heating to 475 ℃, and enabling the pre-superplastic process piece to be filmed to a lower die of the final superplastic die for 50 +/-10 minutes under the condition that the air pressure is 0.4-0.6MPa, so as to complete the final superplastic forming process piece, wherein the forming depth reaches 110mm, and the integral forming depth of the piece reaches 360 mm;