CN112222208A

CN112222208A - Rolling forming method of complex high-rib sheet

Info

Publication number: CN112222208A
Application number: CN202011068367.9A
Authority: CN
Inventors: 黄志权; 来洪玉; 郭浩; 王军朋; 张涛; 赵之勤
Original assignee: Taiyuan University of Science and Technology
Current assignee: Taiyuan University of Science and Technology
Priority date: 2020-10-08
Filing date: 2020-10-08
Publication date: 2021-01-15
Anticipated expiration: 2040-10-08
Also published as: CN112222208B

Abstract

The invention belongs to the field of material forming, and particularly relates to a roll forming method of a complex high-rib sheet. Aiming at the lack of the production process of the high-rib whole plate required by the current engineering production, the method for rolling the plate with the reinforcing ribs of various types and shapes according to the actual requirement is realized, and the method can be used for producing special plates of different specifications and types according to different requirements only by replacing different hole-shaped dies, and specifically comprises a lower conveying roller, an upper positioning roller, a die and a rolling forming method; the invention is a safe and economic special plate production method, can improve the production efficiency, reduce the production cost, save the manpower input and has wide application prospect.

Description

Rolling forming method of complex high-rib sheet

Technical Field

The invention belongs to the field of metal plastic forming, and particularly relates to a roll forming method of a complex high-rib sheet.

Background

The high-performance alloy sheet has wider application in the fields of aerospace and national defense devices, and the device for some special purposes is required to be provided with reinforcing ribs to meet the performance requirement. Through search, in the current practical production, the high-rib plate is realized by directly casting or later welding reinforcing ribs, but the following problems exist:

the production efficiency is low and the cost is high;

the assembly line type production cannot be realized, and the resource waste is serious;

reinforcing ribs in different shapes and types need to be replaced by different production equipment, and have the defects of sand holes, poor precision and the like, and the yield is low;

rolling is the most economic and efficient forming means of high-performance plates at present, and the integral performance of the plates can be obviously improved as metal is subjected to plastic deformation through rolling;

however, in the aerospace field, the strength of the whole structure needs to be improved by forming the reinforcing ribs while the sheet is rolled and formed, wherein the production of the high-rib sheet is more difficult, the local thickening of the blank needs to reach the height required by the rib body while the blank is integrally thinned, and the production process is extremely difficult. If a part requires that the thickness of the wall plate is less than 4mm, and the height of the rib is required to reach 20mm;

aiming at the problems, the rolling forming method of the complex high-rib thin plate provides new technical support for producing the high-rib whole plate, reduces the production cost, realizes online production and improves the production efficiency, so the method has wide application prospect and great economic and social benefits;

disclosure of Invention

The invention aims to provide a safe, economic and efficient rolling forming method of a complex high-strength sheet, which can meet the technical requirements of multi-shape, multi-type, on-line production and the like;

in order to achieve the purpose, the specific invention process is as follows:

a roll forming method of a complex high-rib sheet comprises a lower conveying roller, an upper positioning roller, a die and a roll forming method, as shown in figure 1;

the lower conveying roller is characterized in that the whole body is a cylinder, two sides of the cylinder can be connected with a transmission device, and the whole position is fixed to play a role in conveying workpieces;

the upper positioning roller is characterized in that the whole body is a cylinder, two sides of the cylinder can be connected with a transmission device, and the whole body can move up and down to play a role in fixing a workpiece;

the roller is characterized in that the roller can rotate in two directions, and the upper roller can move up and down to roll for multiple passes and adjust the roll gap;

the die is characterized in that the corresponding position is provided with a groove in the shape of the required rib body, the deformation resistance and the deformation temperature of the die are far greater than those of a formed blank, the binding surface of the die and the blank is subjected to rough treatment to increase the friction force, the effect of preparing different types of reinforcing ribs is achieved, and the size meets the following conditions:

die length L =

Mold width B =1.2 × B

Wherein

The original length of the rolled piece is obtained; h is the original thickness of the rolled piece;

the required plate thickness; b is the original width of the rolled piece

Taking a reinforcing rib shaped like a Chinese character 'jing' as an example, as shown in FIG. 2;

the rolling forming method comprises the following steps: the method is characterized in that a blank and a die are matched as shown in figure 3, the blank and the die enter a roll gap simultaneously, the rolling reduction of each time of rolling is not more than 50% by adopting a low-speed multi-pass rolling mode, and the rolling speed meets the following conditions:

V=

wherein V is the rolling speed; r is the roll radius; h is the original thickness of the rolled piece;

the required thickness is obtained;

the required rib height is high;

for the strain rate, the values are as follows:

=

the invention has the following positive effects:

1. the invention realizes the preparation of special plate blanks on the basis of the existing equipment, and saves the cost of mass production and research and development;

2. different dies can be replaced according to the requirements of reinforcing ribs of different shapes and types so as to adapt to the one-step forming production of the reinforced plate blanks of different types;

3. compared with the existing production mode, the production process has the advantages of greenness, high efficiency, safety and the like;

4. the additional reinforced slab produced by the invention has higher performance and can meet the requirements of special engineering;

5. the invention is convenient to maintain, and the equipment maintenance can be completed only by grinding the corresponding die.

Drawings

FIG. 1 is a rolling forming method of a complex high-strength sheet; 1-lower conveying roller, 2-upper positioning roller, 3-mould, 4-plate blank and 5-roller;

FIG. 2 is a schematic view of a mold of the present invention; 1-contact surface, 2-well-shaped hole shape;

FIG. 3 is a schematic view of the blank and die assembly of the present invention; 1-blank, 2-die, 3-contact surface;

FIG. 4 is a schematic view of the production process of the present invention.

Detailed Description

To produce a sheet thickness h₁=5mm, rib height h₂Sheet material of =15mm as an example:

production parameters are as follows: blank thickness h =35 mm; required plate thickness h₁=5 mm; height of rib h₂=15 mm; thickness h of the mold₃=15 mm; a single stand rolling mill, wherein the radius r of a roller is =500 mm;

designing the production pass as 3 passes, rolling at a speed of 56mm/s, firstly processing the die into a required hole shape with the depth d =15mm, then closely attaching the die and the blank, conveying the die to the roll gap of the roll through a lower conveying roller, pressing down an upper positioning roller to fix the die and the blank, preventing the movement or separation of the rolling process, and adjusting the height h of the roll gap in the first pass₄=h₃+15mm =30mm, the roll corotation, the mould enters the roll with the blank, roll the course, because the mould rolls the deformation resistance and deformation temperature and is far higher than the blank, so in deforming, all deflection is finished by the blank, the mould warp is small and negligible, finish rolling with the first pass, adjust the upper positioning roll and make it fix the blank, adjust the height h of roll gap₄= h₃+10mm =25mm, the roller is reversed for the second pass of rolling, finally the upper positioning roller is adjusted to fix the blank, and the height h of the roller gap is adjusted₄= h₃And 5mm =20mm, the roller rotates forwards, the third rolling is carried out, after the large reduction amount is rolled for multiple times, the blank thickness is changed into the required plate thickness h =5mm, a reinforcing rib body with the height of L =15mm is generated under the action of a die, and the required plate can be obtained through the subsequent procedures of flattening, trimming and end cutting.

Claims

1. A roll forming method of a complex high-rib thin plate comprises the following steps: the die is characterized in that grooves in the shape of a required rib body are formed in corresponding positions, the deformation resistance and the deformation temperature of the die are far greater than those of a formed blank, the bonding surfaces of the die and the blank are subjected to rough treatment to increase friction force, the effect of preparing different types of reinforcing ribs is achieved, and the size meets the following conditions: mold length L = (L × h)/h₁The width of the die B =1.2 × B, wherein l is the original length of the rolled piece; h is the original thickness of the rolled piece; h is₁The required plate thickness; b is the original width of the rolled piece; the rolling forming method comprises the following steps: it is characterized by that the blank material and mould are matched, and simultaneously fed into roll gap, and low-speed multi-pass rolling process is adoptedThe rolling reduction of the rolling in the manufacturing mode should not exceed 50% every time, and the rolling speed should meet the following conditions:

V=

the required thickness is obtained;

the required rib height is high;

for the strain rate, the values are as follows:

=

and the rolling forming method can be used for producing the plates with different specifications by replacing various dies according to production requirements.

2. The upper positioning roller set forth in claim 1 wherein the location of the upper positioning roller is adjustable in real time to ensure close contact with the workpiece for positioning.