CN103021573A

CN103021573A - Preparation method of compressed circular aluminum conductor with high outer layer compactness used for electric cable

Info

Publication number: CN103021573A
Application number: CN2012105518499A
Authority: CN
Inventors: 李新平; 汤浩; 赵振明; 星守疆; 徐文皓; 何佳迅; 吉振伟; 张亚; 周扬; 梁军令; 郭东山; 李元兴
Original assignee: Chongqing Taishan Cable Co Ltd
Current assignee: Chongqing Taishan Cable Co Ltd
Priority date: 2012-12-18
Filing date: 2012-12-18
Publication date: 2013-04-03
Anticipated expiration: 2032-12-18
Also published as: CN103021573B

Abstract

Provided is a preparation method of a compressed circular aluminum conductor with high outer layer compactness used for an electric cable. The aluminum conductor comprises a center layer and a peripheral layer, wherein the center layer is of a circular structure and formed by a plurality of aluminum single lines with one aluminum single line as a center, and the peripheral layer comprises at least two layers. The aluminum conductor is prepared by using a limit compressing method, wherein the aluminum single lines with elongation between 12%-15% are selected, a crystal combination mold or a diamond coating mold is used as a compressing mold, layered compressing is adopted, when a secondary outer layer and an outermost layer are compressed, the compressed volume of the secondary outer layer is decreased, compressed coefficient design value of the secondary outer layer is reduced to 0.86, the compressed volume of the outermost layer is increased to approach a limit compressed volume, accordingly compressed coefficient theoretical calculating value of the outermost layer reaches 0.94, grooves with the size similar to the diameter of the single line are formed on the surface of a shaped secondary outer layer, an outer layer single line is enabled to have a certain embedding volume, an overall compressed coefficient of an obtained aluminum conductor reaches 0.9, and the compressed coefficient of the outer layer single line reaches above 0.92. By using the preparation method, outer layer compactness of the aluminum conductor is improved, and a filling coefficient of the aluminum conductor is guaranteed to be high.

Description

Cable is with outer floor height tightness compressing circular aluminum conductor preparation method

Technical field

The present invention relates to cable, be specifically related to the circular aluminum conductor that cable is used.

Background technology

Press the aluminium core conductor and be widely used in power cable, skin easily to occur aborning not tight but press the aluminium core conductor, the problem of loose slot.Particularly surpass 240mm ²The heavy in section press the aluminium core conductor and the outer loose problem of conductor easily occurs.When designing, compact conductor mainly considered the coefficient that presses of each layer in the past, the general way that successively improves the amount of pressing that adopts on the structural design, and each layer presses coefficient 84%～90%, and generally from inside to outside successively raising is pressed coefficient and is reached approximately 90% when outermost layer.This design is only considered the deformable amount of the aluminium single line of every one deck, and significant limitation is arranged.General employing layering is pressed in the compressing circular aluminum conductor production process, and when producing, after last layer pressed moulding, lower one deck pressed the structural change that Shi Buhui causes last layer.

Summary of the invention

The object of the invention is to the deficiency that exists for prior art, propose a kind of cable with the preparation method of outer floor height tightness compressing circular aluminum conductor, the outer tightness of raising aluminium conductor guarantees that the aluminium conductor activity coefficient is high.

The applicant is by a large amount of practices, find: one deck aluminium single line is under the high amount of pressing, not only this layer single line can be out of shape, also can apply sizable power to the internal layer single line, cause the secondary deformation of internal layer single line, when improving the single line activity coefficient, ectonexine single line position is solidified relatively, the outer forming degree of conductor and tightness are all increased.The applicant has designed a kind of limit compaction thus, limit compaction is to combine from the mechanical property of aluminium own and conductor processing technology, reach at the aluminium single line under the condition of certain toughness, in the deformability scope, be subject to the size that maximum compaction forces is determined compressing mold according to outer aluminium single line, improve the closely outer of aluminium conductor, guarantee that the aluminium conductor activity coefficient is high, produce the circular aluminum conductor of outer floor height tightness.

Technical scheme of the present invention is as follows:

A kind of cable is with the preparation method of outer floor height tightness compressing circular aluminum conductor, and described aluminium conductor comprises central core and perisphere, and wherein central core is circular configuration, is that the center of circle consists of by many aluminium single lines and an aluminium single line, and perisphere has at least two-layer.It is characterized in that, described aluminium conductor prepares with limit compaction, select percentage elongation at 12%～15% aluminium single line, press mould and adopt glomerocryst mould or diamond coatings mould, the employing layering compresses, when compressing time skin and outermost layer, reduce time outer field amount of pressing, the general time skin amount of pressing experience selected value is about 0.88, in order to guarantee the skin amount of pressing, time outer field coefficient design load of pressing is reduced to 0.86, increase the outermost amount of pressing near the limit amount of pressing, namely press the coefficient calculated value and reach 0.94, form the groove of similar line diameter size at the inferior superficies of moulding, make outer single line that certain embedded quantity be arranged; The integral body of the aluminium conductor that makes is pressed coefficient and is reached 0.9, and outer single line presses coefficient and reaches more than 0.92.

According to choosing and the adjustment of crush of above control to the single line percentage elongation, mould, the compressing circular aluminum conductor integral body of producing is pressed coefficient can reach 0.9, and outer single line presses coefficient and can reach more than 0.92, and outer closely high, without loose phenomenon.

Description of drawings

Fig. 1 compressing circular aluminum conductor schematic cross-section;

Stress deformation schematic diagram when Fig. 2 A compressing circular aluminum conductor presses;

Fig. 2 B is the A section enlarged drawing of Fig. 2 A.

Embodiment

Further specify the present invention below in conjunction with accompanying drawing:

Referring to Fig. 1, conductor press coefficient (also being activity coefficient)=every single line sectional area sum/stranded core circumscribed circle area, expand and come the annulus area that presses coefficient=every single line sectional area of this layer sum/this layer of conductor one deck.

k 1 = \frac{π}{4} \times \frac{n 1 \times d^{2}}{D^{2} - D 1^{2}}

K1: the conductor outermost layer presses coefficient;

N1: the outermost single line radical of conductor;

D: line diameter;

D ²: conductor diameter;

D1: conductor time outer external diameter.

Present compressing circular aluminum conductor press coefficient generally 0.88, the outer field coefficient that presses of compressing circular aluminum conductor is generally 0.90.And choose the experience that test draws according to our parameter, and the conductor of production, skin press the coefficient design load will reach 0.94, and namely k1 is not less than 0.94.

The present invention reduces time outer field amount of pressing by the adjustment amount of pressing, and improves the outermost amount of pressing, and makes the outermost coefficient calculated value that presses reach 0.94.And in the actual production, see Fig. 2 A and Fig. 2 B, conductor is by central core 1, inferior outer 2 and outermost layer 3 consist of, outermost layer is owing to the amount of pressing near the limit, filling and tightness are all very high, under the so large amount of pressing, produced simultaneously inwardly very large pressure, shown in Fig. 2 B, the inferior skin of already moulding is out of shape again, inferior superficies after the distortion have formed the groove of similar line diameter size, namely the stress deformation point B among the figure makes outer single line that certain embedded quantity be arranged, and has solidified the relative position of outer single line, combination interface between the ectonexine is increased, outer single line is difficult for producing slip, dislocation is conducive to prevent that conductor is loose, and a nearly step is improved the outer tightness of compressing circular aluminum conductor.

Therefore, in order to realize outer floor height tightness compressing circular aluminum conductor, two conditions need to be arranged: the one, can reach the calculated deformation amount in order to guarantee the aluminium single line, the toughness of single line must meet certain requirements, data rule of thumb, aluminium single line percentage elongation will reach more than 12%; The 2nd, do not break under the limit amount of pressing in order to guarantee wire external layer, should adopt surface smoothness high press mould, such as glomerocryst mould or diamond coatings mould.

Take 240 press aluminium conductor as example: commonly press the aluminium conductor structural parameters and each layer compressing mold external diameter set point sees Table 1:

Table 1

And adopt limit compaction of the present invention, and aluminium single line percentage elongation is controlled at 12%～15%, press mould and adopt the glomerocryst mould.Outer floor height tightness compressing circular aluminum conductor structural parameters and each layer compressing mold external diameter set point see Table 2:

Table 2

The compressing circular aluminum conductor integral body that this method is produced is pressed coefficient can reach 0.9, and outer single line presses coefficient and reaches 0.93, and outer closely high, without loose phenomenon.

Claims

1. a cable is with the preparation method of outer floor height tightness compressing circular aluminum conductor, and described aluminium conductor comprises central core and perisphere, and central core is circular configuration, is made of as the center of circle take an aluminium single line many aluminium single lines, and perisphere has at least two-layer; It is characterized in that, described aluminium conductor prepares with limit compaction, select percentage elongation at 12%～15% aluminium single line, press mould and adopt glomerocryst mould or diamond coatings mould, the employing layering compresses, when compressing time skin and outermost layer, reduce time outer field amount of pressing, time outer field coefficient design load of pressing is reduced to 0.86, increase the outermost amount of pressing near the limit amount of pressing, namely press the coefficient calculated value and reach 0.94, form the groove of similar line diameter size at the inferior superficies of moulding, make outer single line that certain embedded quantity be arranged; The integral body of the aluminium conductor that makes is pressed coefficient and is reached 0.9, and outer single line presses coefficient and reaches more than 0.92.

2. the preparation method of outer floor height tightness compressing circular aluminum conductor according to claim 1 is characterized in that, the perisphere of described aluminium conductor is two-layer, is respectively the second layer and the 3rd layer, each layer compressing mold external diameter set point such as following table:

。