Method for making sheets of magnesium-base alloy for electrochemical electric current sources

FIELD: plastic working of special magnesium base alloys alloyed with elements capable to easy evaporation or to generation at deformation oxides hazard for environment, possibly manufacture of rolled sheets used for making anodes of electrochemical current sources.

SUBSTANCE: method comprises steps of preliminarily deforming heated blank of magnesium base alloy and warm rolling of preliminarily deformed blank for producing sheet; before preliminary deformation placing magnesium alloy blank into envelope of aluminum (Al-Mg-Si system) alloy without sealing. Length of envelope exceeds length of blank at least by 10%. Preliminary deformation is realized by hot rolling or upsetting in die set according to configuration of blank.

EFFECT: production of sheets with electrochemical properties uniform along the whole cross section and with enhanced surface quality, safety labor condition due to preventing evaporation of mercury, toxic oxides and other compounds containing mercury, thallium, gallium, cadmium.

12 cl, 4 tbl, 4 ex

 

The invention relates to the field of processing by pressure special magnesium alloys, doped legisprudence or formed strain dangerous for the environment oxides, and can be used in rolling sheets for anodes of electrochemical power sources.

A method of producing sheets of alloys based on magnesium, including the preparation of ingots, pre-deformation of the heated billet from magnesium alloy and its warm rolling to obtain a sheet (see Magnesium alloys. Handbook edited Mbeltran and other Vol.2. Production technology and properties of castings and deformed semi-finished products. M.: metallurgy, 1978, p.150).

Sheets of magnesium alloys, doped, for example, mercury (easily evaporated item) or gallium and other elements, are used as anode and provide a high potential difference with the cathode, for example, made of silver, Nickel, copper and a number of oxides, are a powerful source of current in an aqueous electrolyte with a weak acidity.

Magnesium alloys in the cold maloplastichnyj, due to the hexagonal crystal lattice and only one plane slip in it.

Therefore, to enhance the plasticity necessary to heat the workpiece to a temperature in the range of 360-420°C.

Rolling of magnesium alloys at lower temperatures when all degrees of deformation inevitably leads to cracks not only on the edge, but on the whole surface, and in some degrees of deformation, for example, more than 30%already in the first passages to the complete destruction.

In addition, experimentally it was found that during hot rolling of ingots and warm rolling of strips required heating rolls to temperatures in the range 100-200°depending on the alloy.

These temperature parameters rolled magnesium alloys in the case of doping their mercury, thallium, gallium and other elements lead to unacceptable phenomena from the point of view of ecology and protection of life and health of the person.

When the doping mercury is an intensive evaporation of mercury from the surface of the sheet as at heating and rolling, and when doped with thallium, gallium, cadmium due to abrasion of the sheet during rolling is the amount of atmospheric dust toxic oxides of thallium, gallium, cadmium, and of course mercury in the form of an aerosol mixture.

These mercury vapors and oxides of thallium, gallium, cadmium and their compounds quickly accumulate on equipment, walls and ceilings of the premises and, most importantly, in the body, that person ends or disability, or flew the major outcome.

In addition, due to evaporation, for example mercury, the surface of sheets is depleted in this element, and electrochemical performance deteriorate abruptly.

Upon receipt of the leaves of these magnesium alloys in a known manner will be observed all of the above disadvantages.

The task of the invention to provide a sheet with high, uniform over the whole cross section of the electrochemical properties of high quality rolling vicodi (no sunsets, captured on the surface, buckling and other defects) and ensuring safe working conditions and environmental standards with a complete solution to the problems of preventing the evaporation of mercury and the formation of toxic oxides and other compounds containing mercury, thallium, gallium, cadmium and other elements.

The problem is solved by a method for manufacturing sheets of magnesium alloy, comprising the preliminary deformation of the heated billet from magnesium alloy and warm rolling pre-deformed preform to obtain a sheet, which for the production of sheets of magnesium alloys, doped legisprudence elements or formed strain dangerous for the environment oxides of these elements, for electrochemical power sources, pre-strain of magnesium alloys are placed in blockwise aluminum alloy system Al-Mg-Si.

Mainly use aluminum alloy shell brand AD31, 6063 or ABB.

In private embodiments of the invention the problem is solved in that the workpiece is placed in the aluminum alloy shell, the length of which exceeds the length of the workpiece, at least 10%.

In the most attractive incarnations of the workpiece is placed in the shell, the length of which exceeds the length of the workpiece by 20-40%.

In addition, the workpiece is placed in the casing with a clearance of 0.5 to 2 mm.

If the workpiece in cross section has a round shape, such that the workpiece is placed in the aluminum alloy shell, made in the form of an extruded tube, the length of which exceeds the length of the workpiece by 10-30%, saccomanni on both sides, and advanced hot deformation is carried out by heating the workpiece to 380-420°by rolling at a temperature of the heating rolls 140-160°With several passes to a thickness that allows you to continue to produce warm rolling. When the length of the extruded pipe is larger than the length of the workpiece by 10-30% on each side.

If the workpiece has a flat shape, the pre-strain in the shell are in stamps.

While the workpiece in the shell is placed in the bottom of the stamp, made in the form of a trough, the amount of which is calculated on the basis of ensuring the free flow of magnesium alloy and is specified in the final thickness of the workpiece, when the dies are heated to 120-150°s and stocking - up to 380±25°C.

You can also pre-deformation of the flat blanks to be implemented through precipitation in the flat dies with the heating of the workpiece to 420±25°and stamp - not less than 150°C.

Heating of the workpiece before the warm rolling is carried out before 360-390°aged in an oven for 30 to 60 minutes, and the warm rolling of billets in the shell are heated to 120-140°rolls with deformation of 10-30% per pass.

After preliminary deformation spend the cooling of the workpiece in the air, while its cooling during warm rolling provide below 320°C.

During warm rolling carry out intermediate heating of the workpiece.

The essence of the proposed method consists in the following.

The workpiece is wrapped from specially selected aluminum alloy. Further round the workpiece or the flat blank is placed in an aluminum shell, can be subjected to two operations:

- the heating and upsetting in a special hot stamp to obtain a flat workpiece thickness of about 10-40 mm to further warm-rolled to a sheet;

- heat in the aluminum alloy shell and hot rolling in the rolling mill heated to 160±10°With rollers regardless of the form of the workpiece is flat or round, then, as in the first case the e, warm rolling of the blanks on the worksheet.

Usually rolling into sheets of different thicknesses are multiple heatings.

Most often, the rolling is carried out to a thickness of 0.3-0.6 mm for primary magnesium alloy.

Example 1.

Table 1 shows the main modes of production workpiece by the method of precipitation.

Table 1
The operation nameTemperature, °Time, minutes
The location of the workpiece in the shell201
Heating of the workpiece in the shell420-1090
Heat a flat stamp for precipitation150+1030
Heat stamp with the deepening (“trough”)15020

When hot draft on flat or special stamps, the bottom of which has a trough-shaped recess, in length equal to the length of the workpiece in the shell, and width, providing a free flow of metal and the design of a flat rectangular blanks.

Sludge is heated blank (see table 1) heated to 150°With stamps. Cooling of the workpiece is in the air.

Example 2.

Heating and hot rolling of billets in the shell.

Table 2
The operation nameTemperature, °Time, minutes
Heating of the workpiece in the shell380-400120
Rolling  
start400±153
end360-
Heating rolls160±5During rolling

Example 3. Warm rolling of billets.

Table 3
The operation nameTemperature, °Time, minutesThe number of passes
1st heat before warm rolling360-42040-6010-12
Intermediate heat36015-2018-22
Rolls100-120During rolling-

As already mentioned, for the shell is chosen special aluminum alloy system Al-Mg-Si. The choice of aluminum alloy due to the need to select parameters for deformation resistance equal to or close to the resistance to deformation of the OS is ESD magnesium alloy.

As alloys, the most similar properties to the magnesium alloys at temperatures of hot and warm rolling, fit

- alloy AD31 GOST 4784-97, similar 6063 ASTM ANSI N,

- alloy ABB GOST 4784-97.

Aluminum cast alloys according to GOST 1583-93 unsuitable, so as to form an open porosity: 12 then ⊘ 0.3 mm to 1 cm2surface, and do not prevent the evaporation of alloying elements.

The alloys of the system Al-Mg-Si chosen because they are uniformly deformed together with magnesium alloy, not sliding surface, as, for example, pure aluminum, and no cracking.

In addition, when the heating and hot deformation there is an interaction between magnesium alloy and aluminum shell with the formation of the intermetallic layer. The formation of this layer significantly influences the results of the warm rolling (changing the number of passes and affecting crack growth).

Shell thickness (plating) is calculated based on the schema and the degree of deformation. For workpiece diameter 100 mm shell thickness should be 5 mm Billet fits into the shell. The gap is 1 mm shell Length greater than the length of the workpiece 30% (15% from each end) and saccarides without sealing it completely, which allows free escape of gases during hot deformation after precipitation and hot rolling. If the procurement tiermedizin the VAT, when deformation is rupture of the cladding from the end and release of gases, including mercury vapor, with a strong “cotton”. For example, in table 4 the results of measurements on mercury in the environment during hot deformation of blanks and sheets without protective plating.

Example 4.

Heating and rolling is not protected by a shell blanks of alloy doped mercury, thallium and other elements.

The data in this table clearly show that to produce the usual rolling without shell impossible. Moreover, in the case of the alloy with mercury depletion of the surface layer of the leaves, starting with the hot rolling, is up to 40% at a depth of 0.1 mm

1. Method for the production of sheets of magnesium alloys, including pre-deformation of the heated billet from magnesium alloy and warm rolling pre-deformed preform to obtain a sheet, characterized in that for the production of sheets of magnesium alloys, doped legisprudence elements or formed strain dangerous for the environment oxides of these elements, for electrochemical power sources prior to deformation of the workpiece from magnesium alloys are placed in a shell made of aluminum alloy system Al-Mg-Si without sealing.

2. The method according to claim 1, distinguishing the I, what use aluminum alloy shell brand AD31, 6063 or ABB.

3. The method according to claim 1, characterized in that the workpiece is placed in the aluminum alloy shell, the length of which exceeds the length of the workpiece by at least 10%.

4. The method according to claim 1, characterized in that the workpiece is placed in the casing with a clearance of 0.5 to 2 mm.

5. The method according to claim 1, characterized in that the magnesium billet with a round cross-section, is placed in the aluminum alloy shell, made in the form of an extruded tube, saccomanni on both sides, and pre-deformation is performed by rolling the billet magnesium alloy casing aluminum alloy heated to a temperature of 380-420°and when heated to 140-160°With the rolls for several passes until the thickness, allowing the warm rolling.

6. The method according to claim 5, characterized in that the workpiece is placed in the extruded tube of aluminum alloy, the length of which exceeds the length of the workpiece by 10-30% on each side.

7. The method according to claim 1, characterized in that the preliminary deformation of the flat blanks from magnesium alloy casing aluminum alloy is carried out in the stamps.

8. The method according to claim 7, characterized in that the workpiece in the shell is placed in the bottom of the stamp, made in the form of a trough, the amount of which is calculated on the basis of ensuring the free flow MAGN is avago alloy and a predetermined final thickness of the workpiece, when the dies are heated to 120-150°s and stocking up (380±25)°C.

9. The method according to claim 7, characterized in that the preliminary deformation is carried out by precipitation in a flat dies with the heating of the workpiece to (420±25)°and stamp of not less than 150°C.

10. The method according to claim 1, characterized in that before the warm rolling produce heating of the pre-deformed preform to 360-390°aged in an oven for 30 to 60 min, and warm rolling are heated to 120-140°rolls with deformation of 10-30% per pass.

11. The method according to claim 10, characterized in that after preliminary deformation conduct pre-cooling of the deformed billet air, cooling during warm rolling provide below 320°C.

12. The method according to claim 10, characterized in that during warm rolling carry out intermediate heating of the workpiece.



 

Same patents:

FIELD: chemical current supplies; stand-by water activated cells.

SUBSTANCE: novelty is that proposed anode of water-activated current supply is, essentially, magnesium, gallium, and thallium base alloy with gallium content of 0.5 to 2.0% and ratio of total gallium and thallium content to magnesium content is 0.08 to 0.10.

EFFECT: enhanced discharge characteristics.

1 cl, 2 ex

The invention relates to the electrical device to the power source, to methods of manufacturing parts, such as the anode, and the materials for the manufacture of the anode, and more particularly to electrochemical metallovozdushnyj current source with an aluminum anode

The invention relates to chemical current sources, namely salt chemical current sources with aluminum anode

FIELD: metallurgy, processes for making hot rolled band of magnesium alloy.

SUBSTANCE: method comprises steps of producing strip blank by continuous casting of melt of magnesium alloy; hot rolling of strip blank directly after casting at several passes for producing hot rolled band with thickness no more than 50 mm. Hot rolling is performed at initial temperature values 250°C - 500°C for providing final thickness of band no more than 4 mm. At first pass of hot rolling reduction degree is equal at least to 15%.

EFFECT: possibility for making magnesium sheets with improved deformation capability at less costs of manufacturing process.

11 cl, 1 dwg, 2 tbl, 1 ex

The invention relates to the field of mechanical engineering and aircraft and can be used in the manufacture of the deformed semi-finished products of magnesium alloys
The invention relates to the chemistry of organosilicon compounds, in particular to methods for organoselenium silanes, and can be used to obtain silicone fluids and resins of various types

The invention relates to the field of engineering including aerospace engineering, there can be used a deformable alloys
The invention relates to a method of heat treatment of products made of magnesium alloys, in particular, to a heat treatment arms onion sports

FIELD: rolled stock production.

SUBSTANCE: method of rolling metallic strip with use of skin pass stand comprises steps of reducing strip by thickness; adjusting speed Vi of strip at inlet of stand and speed Vo of strip at outlet of stand regardless of strip tension; setting relation of Vi/Vo equal to (1 - E*) being relation of desired strip thickness at outlet of stand to strip thickness at inlet of stand, E* - preset value of strip elongation. Apparatus for rolling metallic strip includes skin pass rolling stand for reducing thickness of strip and setters for setting inlet and outlet speed values of strip for adjustment of speeds Vi and Vo regardless of strip tension.

EFFECT: enhanced quality of rolled strip.

8 cl, 3 dwg

FIELD: metallurgy, processes for making hot rolled band of magnesium alloy.

SUBSTANCE: method comprises steps of producing strip blank by continuous casting of melt of magnesium alloy; hot rolling of strip blank directly after casting at several passes for producing hot rolled band with thickness no more than 50 mm. Hot rolling is performed at initial temperature values 250°C - 500°C for providing final thickness of band no more than 4 mm. At first pass of hot rolling reduction degree is equal at least to 15%.

EFFECT: possibility for making magnesium sheets with improved deformation capability at less costs of manufacturing process.

11 cl, 1 dwg, 2 tbl, 1 ex

FIELD: rolled stock production, namely apparatuses for mounting -dismounting bearing unit of backup roll of rolling stand.

SUBSTANCE: apparatus includes chock in which bearing assembly for roll journal is arranged. Apparatus that may be temporarily joined with bearing unit and may be axially moved in direction of backup roll and from it includes lever type inner and outer cams. Inner cams are introduced to end part of backup roll journal; outer cams are introduced to bearing unit. Inner and outer cams are mounted with possibility of rotation and locking by means of bayonet type lock in end part of journal and in bearing unit. End part of journal and intermediate ring screwed-on to bearing unit at its outer side are in the form of clover leaf having through grooves for inner and outer cams. Said cams after their rotation to clamp position may engage with respective locking protrusions of journal end part and of intermediate ring. In front of outer cams, pressure ring arranged before bearing assembly of journal is mounted.

EFFECT: lowered costs of changing bearing assemblies, increased useful life period and enlarged using range of apparatus.

5 cl, 3 dwg

FIELD: making of embossing on the commercial packing materials.

SUBSTANCE: the offered technology is dealt with making embossment on the flat materials and is used for packing of tobacco products. Rollers of the devices for making embossment, which are used for machining of the flat materials, including the firs driven roller and the conjugate roller are located in parallel to each other in a holder and may be placed so, that to enter into a definite mutual contact. At least one of the rollers for making embossment is located in a replaceable unit. At that the replaceable unit is supplied with retention tools. The holder contains pockets, the form of which is in essence complimentary for the retention tools so, that the replaceable unit may be entered in a predominantly defined position into the holder by insertion of the retention tools into corresponding pockets. The given technology provides more mild replacement of the rollers.

EFFECT: the invention ensures more mild replacement of the rollers.

20 cl, 16 dwg

FIELD: automation of rolled stock production.

SUBSTANCE: at controlling thickness of tube wall in multi-stand continuous stretch-reducing mill, thickness of tube wall is measured behind mill by means of wall thickness measuring devices. Measured values are processed in computing unit. Revolution numbers of drive engines of rolls are controlled by means of units for controlling revolution number. In order to minimize formation of inner multi-arc profile at passing tube, total elongation value is kept constant due to changing revolution number of drive engines of rolls under control of computing unit.

EFFECT: enhanced quality of products.

5 cl, 4 dwg

FIELD: rolling equipment, namely transporting apparatuses, particularly roller table of rolling mill.

SUBSTANCE: roller table includes driven transporting rollers and lifting mechanism; lifting framework jointly mounted on struts and supporting transporting rollers; additional mechanism for lifting framework. Each mechanism for lifting framework is arranged in strut and it is in the form of sleeve, nut mounted inside said sleeve with possibility of motion and jointly connected through lug with framework; worm reduction gear joined with sleeve. In reduction gear and in sleeve there is opening in which screw is arranged. Said screw has cut splines in one end and in other end it has thread engaged with nut of sleeve. At least in one strut rotary crosspiece is jointly mounted. Lifting mechanism is mounted on said crosspiece.

EFFECT: enhanced operational efficiency of mill due to elimination of jamming movable links.

2 dwg

FIELD: continuous rolling of strip, namely rolling strip having different thickness portions joined through transition wedge-shaped portion.

SUBSTANCE: method is used for rolling metallic strip 1 in rolling mill having at least two rolling stands. Metallic strip 1 has at least two zones 3,4 of different thickness mutually joined through wedge-shaped or approximately wedge-shaped transition portion 2. Rolling rate in rolling stand at rolling wedge-shaped portion 2 is tuned depending upon forward slip of rolling stand and also depending upon temperature of metallic strip 1. Apparatus for rolling includes rolling mill having at least two rolling stands providing tuning of rolling rate at rolling wedge -like or approximately wedge-like transition portion 2 of strip depending upon forward slip of rolling stand and upon temperature of metallic strip 1.

EFFECT: enhanced quality of rolled products.

2 cl, 5 dwg

FIELD: automation of rolling processes.

SUBSTANCE: method comprises steps of measuring disturbance-stimulated strip thickness in front of rolling stand; controlling measurement result until inlet of stand; compensating it in stand by moving screws of screw-down mechanism at predetermined rate for preset time interval; measuring fluctuation of strip thickness relative to predetermined value when strip leaves stand; acting upon movement rate of screws according to disturbance and to fluctuation of strip thickness after multiplying said values and differentiating received product.

EFFECT: enhanced accuracy and reliability of controlling strip thickness.

2 dwg

FIELD: rolled stock production, namely equipment of shape bending mills, mainly for making tinned corrugated sheets.

SUBSTANCE: drive unit of shape bending mill with first guiding stand and pulling roller devices includes motor, reduction gear, sprockets, forcing and tensioning gear wheels, roller chain embracing sprockets along S-shaped curve and sine curve. Torque of motor is transmitted only to lower shaping rolls of even stands and of last stand of mill and also to both rolls of guiding stand and to horizontal rollers of pulling devices through sprockets mounted on their axles. Chain embraces sprockets of rolls of guiding stand and of rollers of pulling devices along S-shaped curve and it embraces sprockets of drive rolls and sprockets that are not joined with shaping rolls along sine curve. Axles of sprockets that are not joined with shaping rolls may be arranged higher than axles of lower drive rolls by value determined according to relation given in claims of invention.

EFFECT: lowered cost of shape bending mill, reduced power consumption for profiling, enhanced quality of ready shapes.

2 cl, 1 dwg, 1 ex

Up!