Method for electropulse and power sphere dynamic plasticisation of pipeline billets metal

FIELD: technological processes.

SUBSTANCE: invention is related to the field of metal plastic working and may be used in manufacturing of multiplane pipelines for pneumatic hydraulic systems of aggregates and machines. Pipe billet is exposed to initial impact pulses of sphere dynamic action. Pulses are applied to diametrically installed sections of external surface of billet along curve having shape of logarithmic spiral of Ya.Bernoulli. Moreover, deformation extent is provided on every side of billet along its whole length, which is identified from the given expression. Then series of electric current pulses are applied to billet with current density in pulse Q=(1.2…2.0) 104. Duration of electric current pulses action τ=(0.3…0.4) T, where: T is duration of action at pipe billet with initial impact pulses. Then secondary impact pulses of sphere dynamic action are applied on external surface of pipe billet. Value of deformation extent from every side of pipe billet from secondary impact pulses is identified from given expression.

EFFECT: provision of generation of regulated field of compressive stresses in metal purified from dislocations, which guarantees preservation of geometry of pipelines made of billets.

2 dwg, 1 ex

 

The invention relates to the field of materials processing pressure, and in particular to methods and devices for cold plastic deformation and electropulse treatment of metallic workpieces before deformation, and can be used in the manufacture of Omni-directional piping for pneumatic-hydraulic systems of units and machines in the automotive industry, aircraft construction, fuel and energy, medicine, food industry, shipbuilding and rocket.

There is a method of electro-plasticization of the metal billet and its subsequent deformation [Magazine "die Forging production", 1985, No.1, p.29-31].

The disadvantages of this method are:

- significant energy consumption of the process of plasticization of the metal of the workpiece due to the need for guidance on her series of pulses of electric current of high current density in the stream (~108 a/m2);

- the inability in the process of deformation of the workpiece to implement the wave nature of plastic deformation in the form of plastic rotors (vortices), penetrating to nanorover (10-9m) of the metal workpiece and generates a regulated field compressive stresses forming in the metal pipe after the flexible pushing so-called "artificial intelligence".

The present invention I have is the development of the way, which allows early processing of the workpiece to clear the metal from the previously made dislocations, and then to ensure the penetration of plastic rotors (vortices) in nanorover

(10-9m) of the metal billet and the formation of arrays of metal fibrous structure of the spiral geometry with "artificial intelligence".

To solve the problem the way electro and power svetodinamichesky plasticization of metal billets pipelines includes the processing of steel billets overlaid initial shock pulses fertilityscore impact, which is applied to diametrically located parts of the outer surface of the billet along the curve having the shape of a logarithmic spiral Bernoulli to provide the degree of deformation on each side of the billet along its entire length, which is determined from the following equation:

εsfod=(0,4...0,5)σt,

where: εsfodthe degree of deformation of billets on each side, %;

σtthe yield strength of the material of the tubular workpiece, %,

then to pipe the workpiece apply the series of pulses of electric current with a current density in the momentum Q=(1,2...2,0)104(A/m2) when duration of exposure pulses of electric current, which is determined from abusage expression:

τ=(0,3...0,4)T,

where: τ is the exposure duration for tubular workpiece pulses of electric current;

T is the exposure duration for tubular workpiece initial shock pulses fertilityscore effects,,

then on the outer surface of the tubular workpiece impose secondary shock impulses fertilityscore effects that make the curve referred to the original fertilityscore impact, ensuring the degree of deformation on each side of the billet along its entire length, which is determined from the expression:

εsfod=(0,1...0,2)εsfod,

where: εsfodthe degree of deformation of billets on each side from the secondary shock pulses fertilityscore effects, %.

It was found that the overlay on the workpiece initial shock pulses fertilityscore impact, ensuring the degree of deformation on each side of the billet is less than 0.4, σtdoes not facilitate the creation of regulated morphology of the spiral arrangement of the structural hubs dislocations in the array structure of the metal of the workpiece, while the excess referred to the degree of deformation of the values 0,5σtdramatically increases the likelihood of uncontrolled formation of new dislocations.

The Annex to zagotovleniia pulses of electric current with a current density per pulse is less than 1.2·10 4A/m2does not provide the regulated movement of dislocations, and the current density of more than 2.0·104A/m2leads to uncontrolled heating of the metal and the destruction of established structural hubs dislocation.

The duration of the electric pulse for tubular workpiece less than 0.3 T does not ensure the required degree of purification of its metal against dislocation, and the duration of more than 0.4 T increases the likelihood of uncontrolled heating of metal billets. Overlay for pipe billet secondary shock pulses fertilityscore impact with the degree of deformation with each side less than 0.1 εsfoddoes not ensure the formation of a given regulated field siaosi stresses in the metal tube stock, and the excess of the stated degree of strain value of 0.2 εsfodincreases the probability of discontinuity of the metal billet in the subsequent bending of the pipeline.

Method and electro power svetodinamichesky plasticization metal blanks pipelines is illustrated by drawings, where:

figure 1 - schematic diagram of the processing of steel billets overlaid shock pulses fertilityscore effects;

figure 2 shows a schematic diagram of electro-plasticization met is the lia blanks pipelines.

The method is as follows.

The workpiece 11 is placed between the strikers 9 and 10 fertilityscore shock-pulse device (reverser, figure 1) in the form of platters 3 and 4, connected by struts 5 hosting platforms 6, 7 and springs 8 on racks 5 between them. Produce initial shock-pulse processing of the workpiece 11 along its entire length with drive 1 and Cam 2. In the structure of the metal tube workpiece 11 are formed structural spiral concentrators previously made dislocations based on the principles of rotary symmetry of the Weyl. Then, the workpiece 11 is placed in between the current collectors 13 and 14 (figure 2), the United tokovodov 12 and 15 with a generator of electric pulses 22 and produce electro-processing of the workpiece 11 by a series of electric pulses of low current density in the stream, thereby reglamentirovannyj moving previously concentrated dislocation structure of the metal billet in a specific area, which is then removed.

After this, the workpiece 11 is again placed between the strikers 9 and 10 fertilityscore shock-pulse device and produce secondary processing of the shock pulses along the entire length, forming a metal workpiece 11 is regulated field of compressive stresses with the help of plastic rotors (vortices), penetrating to nanorover handling aemula metal and giving it the properties of the so-called "artificial intelligence", which manifests itself in the form of properties of metal products alone (synergistic) to make decisions in conditions close to critical.

An example of the method.

Produced plasticization of metal samples billets using blocks and electro svetodinamichesky processing when rotating and reciprocating movement of the workpiece in the press mod. DB 2432 (P=160 kN) with the following parameters:

- material billet items 121810;

- the diameter of the round billet 10 mm;

the wall thickness of tubular workpieces 2.0 mm;

the degree of deformation on each side of the tubular workpiece during processing of the initial shock pulses fertilityscore effects;

the density of the electric current pulse in the electric impulse treatment 1.7 a/m2;

- duration of exposure pulses of electric current 25 C;

- processing the initial shock pulses fertilityscore impact 80;

the degree of deformation on each side of the tubular workpiece during processing of the secondary shock pulses fertilityscore impact 19.

Conducted plasticization of metal samples billets allowed:

- to increase the degree of grinding of the grain of the workpiece material at 35 - 40%;

- to improve the article the stump coagulation (rounding hardening nitride phases) by 40-50%;

- to increase the volume fraction vibration crystallographic texture components at 55-60%;

- reduce waste by bumps in the subsequent bending of the samples on the machine TGPS-3 level 27-30%.

Method and electro power svetodinamichesky plasticization of metal billets pipelines, including the processing of steel billets overlaid initial shock pulses fertilityscore impact, which is applied to diametrically located parts of the outer surface of the billet along the curve having the shape of a logarithmic spiral Bernoulli to provide the degree of deformation on each side of the billet along its entire length, which is determined from the following equation
εsfod=(0,4...0,5)σt,
where εsfodthe degree of deformation of billets on each side, %;
σtthe yield strength of the material of the tubular workpiece, %,
then to pipe the workpiece apply the series of pulses of electric current with a current density in the momentum Q=(1,2...2,0)104(A/m2) when duration of exposure pulses of electric current, which is determined from the following expression
τ=(0,3...0,4)T,
where τ is the exposure duration for tubular workpiece pulses of electric current with;
T is the exposure duration for pipe procurement is the original shock pulse fertilityscore impact, with,
then on the outer surface of the tubular workpiece impose secondary shock impulses fertilityscore effects that make the curve referred to the original fertilityscore impact, ensuring the degree of deformation on each side of the billet along its entire length, which is determined from the expression
εsfod=(0,1...0,2)εsfod,
where εsfodthe degree of deformation of billets on each side from the secondary shock pulses fertilityscore effects, %.



 

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