CN103706736B - The roll forming of aluminium alloy straight-flanked ring base is the method for special-shaped thin wall ring - Google Patents

Abstract

The invention discloses the method that the roll forming of a kind of aluminium alloy straight-flanked ring base is special-shaped thin wall ring.Carry out continuously, stably for enabling the operation of rolling, the present invention proposes a kind of reasonable feeding mode of core roller, and according to the shape of aluminium alloy special-shaped thin wall ring and size is counter pushes away design aluminium alloy straight-flanked ring base, thus to realize the roll forming of aluminium alloy straight-flanked ring base be special-shaped thin wall ring.This milling method is mainly used in the shaping of the aluminium alloy special-shaped thin wall ring in the field such as Aeronautics and Astronautics, industrial machinery.

Description

The roll forming of aluminium alloy straight-flanked ring base is the method for special-shaped thin wall ring

Technical field

The present invention relates to a kind of roll-forming method of ring, particularly relate to the method that the roll forming of aluminium alloy straight-flanked ring base is special-shaped thin wall ring.

Background technology

Along with looping mill rolling technology is more and more ripe, the design of ring more and more becomes more meticulous, and special-shaped thin wall ring also produces thereupon.The shape of this special-shaped thin wall ring and size, closer to the shape of part and size, compared with the minimizing machine-finish allowance of limits, thus can reduce machining to the destruction of the forging flow lines of ring, save a large amount of precious metal material, improve stock utilization.

Chinese invention patent description CN101279344A disclosed in 8 days October in 2008 discloses the method for rolling and shaping of a kind of aluminium alloy abnormity ring, the method the aluminium alloy bar by specification blanking through jumping-up, punching, roll ring base for twice, again blank put into rolling and shaping in machine for rolling ring roll off mould, by at the double deflection rolling mode and the precise control in each processing step taking small deformation amount to be shaped in ring base process, roll out the special-shaped ring that structure and properties is good.When adopting said method to produce for the special-shaped ring that wall thickness is thinner, unreasonable or the rolling parameter (feed speed etc. as core roller) of design due to blank controls improperly all influence of rolled process can not to complete smoothly, there will be desultory rolling phenomenon, have a strong impact on the quality of ring.

Summary of the invention

The technical problem to be solved in the present invention is to provide a kind of reasonable feeding mode of core roller, and according to the shape of aluminium alloy special-shaped thin wall ring and size is counter pushes away design aluminium alloy straight-flanked ring base, thus to realize the roll forming of aluminium alloy straight-flanked ring base be special-shaped thin wall ring, the method enables the operation of rolling carry out continuously, stably.

For solving the problems of the technologies described above, aluminium alloy straight-flanked ring base of the present invention roll forming is the method for special-shaped thin wall ring, and its technical scheme comprises the following steps:

Rods and bars of aluminium alloy by specification blanking is heated to the forging temperature of 455 DEG C ~ 475 DEG C, after jumping-up, punching, rolls into straight-flanked ring base in advance;

The size of described straight-flanked ring base designs in such a way:

1. the height of straight-flanked ring base is:

H ₁＝H ₂

Wherein: H ₁for the height of straight-flanked ring base

H ₂for the height of special-shaped thin wall ring

2. the internal diameter of straight-flanked ring base is:

$d=\frac{d_{max}}{k}-\frac{(d_{max}-d_{\min })}{2}-\mathrm{\Δ}H$

Wherein: d is the internal diameter of straight-flanked ring base

K is rolling ratio, gets 1.2 ~ 2.0

D _maxfor the maximum inner diameter of special-shaped thin wall ring

D _minfor the minimum diameter of special-shaped thin wall ring

△ H is the total feed amount of core roller

3. the external diameter of straight-flanked ring base can be obtained according to volume equal principle;

After straight-flanked ring base is reheated forging temperature, load machine for rolling ring; Start machine for rolling ring, the home roll rotating speed of machine for rolling ring is adjusted to 1.5rad/s, cone roller rotating speed is adjusted to 1.0rad/s; Cone roller mainly plays restriction ring soaring and flat end face vertically; With the roll-force of 120KN ~ 2000KN, the feed speed of core roller is increased to 2.8mm/s gradually from 1.6mm/s, straight-flanked ring base and core roller are rotated continuously, and straight-flanked ring base is constantly nipped in rolling die cavity, thus ensure that the follow-up operation of rolling can be carried out continuously, reposefully; When the operation of rolling tends towards stability time, the feed speed of core roller is controlled at 2.8mm/s constant, metal material is main vertically, Radial Flow, irregular cavity is constantly filled, straight-flanked ring base is configured as special-shaped intermediate blank gradually, and the external diameter of special-shaped intermediate blank has almost no change in this process; When irregular cavity is filled to a certain degree, the feed speed of core roller is decreased to 0.4mm/s gradually from 2.8mm/s; Metal material mainly flows along the tangential direction of special-shaped intermediate blank, and special-shaped intermediate blank is grown up rapidly, and the inside and outside footpath being mainly manifested in special-shaped intermediate blank increases, wall thickness reduces; When the external diameter of special-shaped intermediate blank reach require size time, continue the feed speed reducing core roller; Eliminate special-shaped thin wall ring ovality, complete the school circle of special-shaped thin wall ring, and the sharp corner that die cavity is not filled is filled in continuation, thus obtain the special-shaped thin wall ring of shape, size qualification.

Compared with prior art, beneficial effect of the present invention is as follows:

Aluminium alloy straight-flanked ring base of the present invention roll forming is the method for special-shaped thin wall ring, by the conservative control to feed rate of idle roll in rolling each stage, makes the operation of rolling can continue, stably carry out.First the feed speed of core roller is increased to 2.8mm/s gradually from 1.6mm/s, and keep feed speed to be that 2.8mm/s is constant, after being decreased to 0.4mm/s gradually from 2.8mm/s again, and continue the feed speed reducing core roller, until aluminium alloy special-shaped thin wall ring stops operating.The major advantage of the feeding mode of this core roller is, when the feed speed of core roller is between 1.6mm/s ~ 2.8mm/s, can ensure that aluminium alloy straight-flanked ring base is constantly nipped in rolling groove; When the feed speed of core roller reaches maximum 2.8mm/s, start to fill rolling groove; When rolling groove is filled into a certain degree, aluminium alloy special-shaped thin wall ring starts to grow up, and at this moment needs the feed speed reducing core roller to ensure the final size of aluminium alloy special-shaped thin wall ring; When the feed speed of core roller is less than 0.4mm/s, aluminium alloy special-shaped thin wall ring no longer increases, this process mainly eliminates special-shaped thin wall ring ovality, complete the school circle of special-shaped thin wall ring, and continue to fill the sharp corner be not filled in rolling groove, thus obtain the special-shaped thin wall ring of shape, size qualification.The feeding summation that the total feed amount (△ H) of core roller is above each rolling sequence SMIS roller.

The internal diameter (d) of described aluminium alloy straight-flanked ring base is the maximum inner diameter (d of the aluminium alloy special-shaped thin wall ring according to required roll forming _max), minimum diameter (d _min) and the total feed amount (△ H) of rolling ratio (k) and core roller calculate and determine; The height of aluminium alloy straight-flanked ring base is identical with aluminium alloy special-shaped thin wall ring; The external diameter of aluminium alloy straight-flanked ring base can be calculated by the principle that volume before and after rolling is identical to be determined.This blank design method can make aluminium alloy straight-flanked ring base when roll forming, aluminum alloy materials can flow to axial, radial and along ring the tangential direction of ring, thus obtain the excellent aluminium alloy special-shaped thin wall ring of structure property, the volume compensation of special-shaped ring axial flow can be met simultaneously, when ensureing special-shaped ring rolling, do not occur that rolling groove is filled discontented or fills out and to be filled with but outside dimension does not reach the mobile defects such as requirement or process defect.

Take the trade mark as the aluminium alloy of 2A70 be example:

The dimensional accuracy of this alloy special-shaped thin wall ring after testing, reaches 3 ‰ (3/1000ths) of external diameter.

The room temperature tensile properties of this alloy special-shaped thin wall ring after testing: longitudinal tensile strength is 420MPa ~ 435MPa (being greater than the 382MPa of design instructions for use), elongation after fracture was 13% ~ 17% (being greater than 5% of design instructions for use), and Brinell hardness is 125HB ~ 128HB (being greater than the 110HB of design instructions for use).

Accompanying drawing explanation

Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.

Fig. 1 is straight-flanked ring base schematic diagram;

Fig. 2 is as-rolled condition schematic diagram when nipping;

Fig. 3 is the material flowing view of rolling groove when being filled;

Fig. 4 is the as-rolled condition schematic diagram of rolling groove when being filled;

Material flowing view when Fig. 5 is ring increase;

As-rolled condition schematic diagram when Fig. 6 is ring increase;

Fig. 7 is special-shaped thin wall ring schematic diagram.

Detailed description of the invention

Implement the method that aluminium alloy straight-flanked ring base of the present invention roll forming is special-shaped thin wall ring to need to provide the equipment such as forge furnace, forcing press, machine for rolling ring, manipulator.With the trade mark be below the aluminium alloy of 2A70 for example is to describe the detailed description of the invention of the method in detail:

The main chemical elements content (percentage by weight) of this alloy is: containing Cu amount 1.9% ~ 2.5%, containing Mg amount 1.4% ~ 1.8%, containing Fe amount 0.9% ~ 1.5%, ni content 0.9% ~ 1.5%, containing Ti amount 0.02% ~ 0.10%, containing Mn amount 0.20%, containing Zn amount 0.30%, si content 0.35%, other elements single≤0.05% and summation≤0.10%, surplus are Al.

The step of this method is as follows:

1, straight-flanked ring base 1 is designed

Calculate rectangular billet size in such a way:

(1) height of straight-flanked ring base 1 is:

H ₁＝H ₂；

Wherein: H ₁for the height of straight-flanked ring base 1;

H ₂for the height of special-shaped thin wall ring 3.

(2) internal diameter of straight-flanked ring base 1 is:

$d=\frac{d_{max}}{k}-\frac{(d_{max}-d_{\min })}{2}-\mathrm{\Δ}H$

Wherein: d is the internal diameter of straight-flanked ring base 1;

K is rolling ratio, gets 1.2 ~ 2.0;

D _maxfor the maximum inner diameter of special-shaped thin wall ring 3;

D _minfor the minimum diameter of special-shaped thin wall ring 3;

△ H is the total feed amount of core roller 5.

(3) according to volume equal principle, namely aluminium alloy straight-flanked ring base 1 is equal with the volume of aluminium alloy special-shaped thin wall ring 3, can obtain the outer diameter D of straight-flanked ring base 1.

2, base

2A70 bar by specification blanking is heated to the forging temperature of 455 DEG C ~ 475 DEG C, after jumping-up, punching, then according to above-mentioned calculating gained size, rolls into straight-flanked ring base 1 in advance.

3, rolling

After straight-flanked ring base 1 is reheated forging temperature, load machine for rolling ring.Start machine for rolling ring, the rotating speed of the home roll 4 of machine for rolling ring is adjusted to 1.5rad/s, cone roller rotating speed is adjusted to 1.0rad/s.Cone roller mainly plays restriction ring and up rises vertically and flat end face.

(1) rolling bite stage.With the roll-force of 120KN ~ 2000KN, the feed speed of core roller 5 is increased to 2.8mm/s gradually from 1.6mm/s, as shown in Figure 2, due to rotation and the motion of core roller 5 radial feed of home roll 4, straight-flanked ring base 1 and core roller 5 is driven to rotate continuously, and straight-flanked ring base 1 is constantly nipped in rolling groove, thus ensure that the follow-up operation of rolling can be carried out continuously, stably.

(2) rolling groove fills the stage.When the operation of rolling tends towards stability, by constant for the feed speed control 2.8mm/s of core roller 5.Metal material is main vertically, Radial Flow, as shown in Figure 3.Rolling groove is constantly filled, straight-flanked ring base 1 be configured as special-shaped intermediate blank 2 gradually, and the external diameter of special-shaped intermediate blank 2 has almost no change compared with straight-flanked ring base 1, as shown in Figure 4.

(3) the increase stage of ring.When rolling groove is filled to a certain degree, the feed speed of core roller 5 is decreased to 0.4mm/s gradually from 2.8mm/s.Metal material mainly flows along the tangential direction of special-shaped intermediate blank 2, as shown in Figure 5.Now, special-shaped intermediate blank 2 is grown up rapidly, is mainly manifested in the increase of inside and outside footpath, wall thickness reduction, as shown in Figure 6.

(4) school circle, truing phase.When the external diameter of special-shaped intermediate blank 2 reach require size time, continue the feed speed reducing core roller.Eliminate the ovality of special-shaped thin wall ring 3, complete the school circle of special-shaped thin wall ring 3, and continue to fill the sharp corner be not filled in rolling groove.Thus obtain the 2A70 special-shaped thin wall ring 3 of shape, size qualification, as shown in Figure 7.

Adopt the 2A70 special-shaped thin wall ring that said method is produced, its maximum high-depth ratio can reach 20:1.

Claims (1)

1. the roll forming of aluminium alloy straight-flanked ring base is a method for special-shaped thin wall ring, it is characterized in that, comprises the following steps:

Rods and bars of aluminium alloy by specification blanking is heated to the forging temperature of 455 DEG C ~ 475 DEG C, after jumping-up, punching, rolls into straight-flanked ring base in advance;

The size of described straight-flanked ring base designs in such a way:

1. the height of straight-flanked ring base is:

H ₁＝H ₂

Wherein: H ₁for the height of straight-flanked ring base

H ₂for the height of special-shaped thin wall ring

2. the internal diameter of straight-flanked ring base is:

$d=\frac{d_{max}}{k}-\frac{(d_{max}-d_{\min })}{2}-\mathrm{\Δ}H$

Wherein: d is the internal diameter of straight-flanked ring base

K is rolling ratio, gets 1.2 ~ 2.0

D _maxfor the maximum inner diameter of special-shaped thin wall ring

D _minfor the minimum diameter of special-shaped thin wall ring

△ H is the total feed amount of core roller

3. the external diameter of straight-flanked ring base can be obtained according to volume equal principle;

After straight-flanked ring base is reheated forging temperature, load machine for rolling ring; Start machine for rolling ring, the home roll rotating speed of machine for rolling ring is adjusted to 1.5rad/s, cone roller rotating speed is adjusted to 1.0rad/s; Cone roller mainly plays restriction ring soaring and flat end face vertically; With the roll-force of 120KN ~ 2000KN, the feed speed of core roller is increased to 2.8mm/s gradually from 1.6mm/s, straight-flanked ring base and core roller are rotated continuously, and straight-flanked ring base is constantly nipped in rolling die cavity, thus ensure that the follow-up operation of rolling can be carried out continuously, reposefully; When the operation of rolling tends towards stability time, the feed speed of core roller is controlled at 2.8mm/s constant, metal material is main vertically, Radial Flow, irregular cavity is constantly filled, straight-flanked ring base is configured as special-shaped intermediate blank gradually, and the external diameter of special-shaped intermediate blank has almost no change in this process; When irregular cavity is filled to a certain degree, the feed speed of core roller is decreased to 0.4mm/s gradually from 2.8mm/s; Metal material mainly flows along the tangential direction of special-shaped intermediate blank, and special-shaped intermediate blank is grown up rapidly, and the inside and outside footpath being mainly manifested in special-shaped intermediate blank increases, wall thickness reduces; When the external diameter of special-shaped intermediate blank reach require size time, continue the feed speed reducing core roller; Eliminate special-shaped thin wall ring ovality, complete the school circle of special-shaped thin wall ring, and the sharp corner that die cavity is not filled is filled in continuation, thus obtain the special-shaped thin wall ring of shape, size qualification.