A method of making banded tool having the form of a body of rotation

 

(57) Abstract:

Use: for the manufacture of composite rollers used in machines continuous casting. The essence of the invention: manufacture axis, and a band consisting of several rings. Stick a bandage on the axis of the landing clearance. The gap between the roller axis and each ring in the middle part of the last constant and is equal to (0,1 ... 2,5) 10-2the thickness of the bandage. The length of the middle section is from 0.3 to 0.8 times the width of the ring. On end parts of the ring gap decreases along the roller axis as the distance from the middle of the plot. At the ends of the ring gap is (0,5 ... 9,5) 10-3the thickness of the bandage. Then produce surface hardening bandage with induction heating. The creation of the initial gap, varying along the axis of the roller, allows you to compensate for uneven shrinkage band on the subsequent surface hardening and to provide thereby improving the reliability of connection of the truss to the axle. table 2.

The invention relates to mechanical engineering and can be used in the manufacture of composite rollers used in machines continuous casting.

Isbusy joint hot deformation of the brace and the axis [1]

However, when joint plastic deformation cannot get connection details with considerable tension. During operation of the roller bandage in contact with the hot slab is heated, causing the slippage of the bandage about the axis. Another disadvantage of this method is significant complexity.

A known method of making banded tool having the form of a body of revolution, comprising manufacturing the axis of the instrument and band, head band to the axis of the landing clearance and subsequent surface hardening bandage with induction heating [2]

This method does not allow for the attachment of the truss on the axle with the optimum gap, so that the reliability of connection can not be provided.

The objective of the invention is to improve the reliability of connection of the brace with the axis.

For this purpose, in the known method of making banded tool having the form of a body of revolution, comprising manufacturing the axis of the instrument and band, head band to the axis of the landing clearance and subsequent surface hardening bandage with induction heating, in the manufacture of roller, mainly for the machine nepreryvnog is C, thus the value of the gap between the roller axis and each ring in the middle part of the last, having a length of from 0.3 to 0.8 of its width, constant along the axis of the roller and is (or 0.1.2,5)10-2the thickness of the bandage, and the end parts of the ring gap decreases along the roller axis as the distance from the middle section to the values at the ends of the ring part (of 0.5.9,5)10-3the thickness of the bandage.

The attachment of the brace to the axis in accordance with the method allows for surface hardening bandage to provide uniform tension, thereby increasing the reliability of connection of the brace with the axis.

The method is as follows.

Produce axle and the band, consisting of several rings. Skewer the band around the axle on a sliding fit, and each ring brace axle skewer with a gap, increasing along the roller axis as the distance from each end surface of the ring from the value equal to about 0.5.9,5)10-3the thickness of the bandage to a value equal to (0,1.2,5)10-2the thickness of the bandage, and the middle part of the ring on the site, 0,3.0,8 its width, is placed on the axis with a gap, not varying along the axis of the roller. Then produce surface hardening bandage rum, not changing along the axis of the roller, and the subsequent surface hardening of the band is ensured by the uneven tightness.

In the middle part of each of the retaining rings on the site, 0,3. 0.8 times the width, the tension is constant, and in areas adjacent to the end surfaces of the ring, the tension decreases as approaching to these surfaces. Given the uneven tightness is not ensured sufficiently reliable connection of the brace with the axis of the roller.

This method allows you to compensate for uneven shrinkage of the retaining ring by creating the initial gap, varying along the axis of the roller. Near the end surfaces of the ring gap should be minimal, and as the distance from these surfaces, the clearance should be increased to the maximum value. In the middle of the ring gap is kept maximum, not varying along the axis of the roller.

The length of the middle part of the ring on which the clearance should be maintained constant, determined on the basis of the analysis of experimental data, are given in table. 1.

The Biot number in this case is calculated by the formula

Bi= where Bi is the Biot number (dimensionless);

- the coefficient of heat transfer during spray cooling surface is in the body of the bandage during induction heating, m;

- coefficient of thermal conductivity of the material of the bandage, W/(MK).

The value N are the technological characteristics of the processing method and are assigned based on the material properties of the brace and the technical characteristics of the equipment used. In table. 1 covers the whole possible range of values of the Biot number.

As follows from the data table. 1, the length of the middle section, within which the shrinkage of the ring constant is 0.3.0.8 times the width of the ring. Thus, within this area of the initial gap should be retained, not changing along the axis of the roller, otherwise the fit between the axle and tyre after processing will not be permanent.

The proposed range of values for the minimum and maximum clearances are selected on the basis of the analysis of the results of the mechanical tests banded rollers that are listed in the table. 2.

The appearance of cracks on the surface of the brace due to the fact that the internal stresses in the surface layer exceeds the tensile strength of the material of the bandage, while stresses in the zone of contact of the tyre with the axis and is not large.

Shear stresses in the contact zone is calculated by the formula

where is shear stress, PA;

BR>
F contact area, m2.

The area calculated by the formula

F dl, where l is the width of the retaining ring, m

As follows from the data table. 2, a good connection of the brace with the axis takes place in the case when the brace axle mounted with a clearance, the minimum value near the end faces of which is about 0.5.9,5)10-3the thickness of the brace, and a maximum of 0.1.2,5)10-2the thickness of the brace away from the end surfaces.

When reducing the minimum and maximum gaps respectively to 0,410-3and 0,0810-2the thickness of the bandage after quenching the surface of the bandage was struck by the cracks, what was the reason for the decrease in reliability of connection of the truss to the axle. When the initial minimum and maximum clearances respectively 0,110-3and 0,0610-2the bandage was already destroyed during the quenching process.

Increase the minimum and maximum gaps respectively to 9,610-3and 2,610-2and above leads to a sharp drop in the efforts of the resistance to turning of the brace relative to the axis. When the initial minimum and maximum clearances respectively 1110-3and 3,410-2the band has not joined the axis, i.e., after quenching the tightness between b owano on the need for exceptions local stress concentrators.

P R I m e R 1. The axis of the roller continuous casting machine billet made of steel 45. The diameter of the axis 230 h7. Steel HIP made of the retaining ring with a width of 200 mm, diameter of hole 230 mm, an Outer diameter of the rings 270 h9. Thus, the thickness of the retaining ring is 20 mm, the Retaining ring is placed on the axis, while the gap between the axle and the band near the face surface is 0.1 mm, which is 510-3the thickness of the bandage (DC 20510-30,1). As the distance from the end surfaces of the gap increases monotonically to a maximum value, equal to 0.3 mm, which is 1,510-3the thickness of the bandage (201,510-30,3). In the middle of the ring with a length of 120 mm, the gap between the tire and the axis is constant and equal to 0.3 mm, Thus, the length of the average parcel width is 0.6 rings. Described the nature of changes in the initial clearance is provided by the corresponding design of the Seating surface of the ring.

The collected set design center installation for surface hardening by high frequency currents. Power inductor 250 kW, current frequency 2500 Hz, the rotational speed of the spindle with roller 20 rpm In the lower part of the loop inductor has sprayer is 1.2 mm/s

After quenching banded roller removed from the installation and subjected to a stabilizing vacation at a temperature 650.680aboutWith bogie hearth furnaces.

P R I m m e R 2. Composite roller for continuous casting machine billet made in the sequence described in example 1. The retaining ring axle skewer with a gap varying along the axis of the roller in accordance with a ratio of

m1+msinK K - K +1

(1) where is the magnitude of the gap between tyre and axle;

h the thickness of the bandage;

l the width of the ring;

Z value is the distance from the end surface of the ring;

m1, m2K constant values;

-K is the Heaviside function, when-K 0-K 1 when K < 0-K 0

Ratio (1) meets the following conditions.

1. Near the ends of the Z 0, m1(the minimum value). When m14,510-3, = 4,510-3h.

2. Away from the end surfaces of the gap reaches a maximum value of

m1+m2< / BR>
When m21,510-2, = h(m1+ m2)(4,510-3+ 1,510-2) h 1,95 h.

3. In the middle of the ring gap is constant, equal

h(m1+ m2).

4. The length of the middle section with a constant gap is equal to S. If is 2">

5. Function (1) is monotonically increasing.

6. The transition from the plot with increasing gap to the site with a constant gap occurs smoothly, as derived from function (1) when K is equal to zero.

7. Plot with a constant gap corresponds to value

K and the value Z can be measured from either end surface of the ring.

The only disadvantage of this method, including the implementation of the gap in accordance with relation (1) is the technological complexity of design seat rings sinusoidal.

A METHOD of MAKING BANDED TOOL HAVING the FORM of a body of revolution, comprising manufacturing the axis of the instrument and band, head band to the axis of the landing clearance and subsequent surface hardening bandage with induction heating, characterized in that in the manufacture of roller, mainly for continuous casting machine billet, the band perform a composite of several successively arranged along the axis of the roller rings, and the gap between the roller axis and each ring in the middle part of the last, having a length of 0.3 to 0.8 of its width, constant along the axis of the roller and is (0,1 - 2,5 IR as the distance from the middle section to the values at the ends of the ring, component (0,5 - 9,5)10-3the thickness of the bandage.

 

Same patents:

The invention relates to mechanical engineering and can be applied in an automated Assembly-line production
The invention relates to thermo-mechanical processing of metals and can be used in metallurgy and mechanical engineering

The invention relates to the connection of hull structures (parts) of the composites butt in shipbuilding and can be used in various industries

The invention relates to a mechanical Assembly production and can be used in the Assembly of high-precision joints with small tightness and transition fit

The invention relates to mechanical work, namely the pair of coaxial parts tightness

The invention relates to foundry and metallurgical industries, in particular to continuous receive the strip from the melt

The invention relates to continuous casting of metals, in particular, to obtain a thin steel products, between two rollers with parallel axes, driven in rotation in the opposite direction

The invention relates to metallurgy, and more particularly to a continuous casting slab with compression of solid-state

The invention relates to metallurgy

The invention relates to metallurgy, and more particularly to continuous casting of ingots with compression of solid-state

The invention relates to metallurgy, and more particularly to a continuous casting slab with compression of solid-state

The invention relates to metallurgy, and more particularly to a continuous casting slab with compression of solid-state

The invention relates to metallurgy, and more particularly to a continuous casting slab with compression of solid-state

The invention relates to metallurgy, and more particularly to a continuous casting slab with compression of solid-state

FIELD: metallurgy, namely manufacture of metallic fibers with amorphous and(or) microcrystalline structure.

SUBSTANCE: apparatus includes housing, feeder for supplying melt metal; inner and outer disc crystallizers mounted in the same axis with possibility of separate rotation of their working surfaces one relative to other; rotation drives of outer and inner disc crystallizers. Novelty is at least two calibrating devices in the form of metallic plates mounted on working surface of outer disc crystallizer. There is coaxial cone recess in working surface of inner disc crystallizer.

EFFECT: enlarged assortment of metallic fibers.

10 cl, 5 dwg, 3 ex

FIELD: metallurgy.

SUBSTANCE: method comprises steps of holding pair of cooled casting rolls in parallel one relative to other; creating between rolls zone of their approaching; providing possibility of cross motion of one roll relative to other; continuously applying effort to one casting roll for shifting it crosswise towards other roll; setting between rolls initial gap being less than thickness of cast strip in zone of roll approaching; providing rotation of rolls in opposite directions in such a way that their peripheral surfaces move downwards in zone of roll approaching; casting melt metal to zone of approaching rotating rolls and creating bath of melt metal hold on rolls over zone of roll approaching; controlling revolution number of rolls in such a way that to set mode of casting strip whose thickness in front portion exceeds initial gap between rolls; as formed strip pushes one roll from other roll, overcoming applied shifting effort and increasing gap between rolls for adapting it with thickness of initially cast strip; then increasing gap between rolls in comparison with initial gap.

EFFECT: flexible control of casting speed providing optimal condition of metal solidification and bath filling rate due to possibility of using rolls having profiles of different thickness values.

7 cl, 12 dwg, 1 ex

FIELD: metallurgy, namely methods for making metallic fibers that may be used for manufacturing composite materials.

SUBSTANCE: method comprises steps of feeding in vertical plane stream of melt metal from nozzle of feeder onto rotating cooled surface; forming on said surface from layer of melt metal discrete liquid structures of metallic fibers; cooling fibers until their crystallization; before feeding stream of melt metal, setting its temperature in range (1.04 x t - 1.18 x t), where t - crystallization temperature of melt metal. Metallic fibers are formed by two stages. At first stage liquid structures of metallic fibers are moved at rate 0.5 - 148 m/s on cooled surface. At second stage metallic fibers are subjected to percussion cooling on ribbed surface of outer disc-type cooled crystallizer at cooling rate in range 3/3 - 25.7.

EFFECT: production of metallic fibers with possibility of increasing range of their fineness at different phase content.

7 cl, 3 dwg, 3 ex

FIELD: processes for continuous casting of metallic band, for example of aluminum and its alloy.

SUBSTANCE: invention includes group of inventions such as housing of roll of manufacturing plant, roll cooling method, roll of manufacturing plant and plant for continuous casting. Housing of roll includes cylindrical yoke and cooling contour. The last includes at least one main duct for supplying cooling agent, at least one main duct for discharging cooling agent, at least one distributing manifold, at least one discharge manifold. At least one distributing tube for communication of each manifold with respective main duct and large number of annular passages connecting supply and discharge manifolds. Said manifolds and annular passages are designed for providing contact of cooling agent circulating in cooling contour with inner surface of yoke for cooling it. Distributing and discharging manifolds are arranged alternatively in peripheral and lengthwise directions and they form geometrically ordered circuit under yoke surface. Manifolds of one row are mutually shifted by distance equal to 5 - 25 % of their length. Method comprises steps of cyclically changing direction of circulation of cooling agent in cooling contour at least of one roll.

EFFECT: enhanced uniformity, improved quality of cast metallic band due to minimized temperature difference in roll and lowered degree of thermal ovalization occurred in rolls at operation.

14 cl, 6 dwg

FIELD: metallurgy, namely apparatuses for producing thin strips at continuous casting of metals and alloys.

SUBSTANCE: aggregate includes two pairs of water cooled rolls-crystallizers arranged in pairs without gap in the form of blocks mounted for forming inter-roll vessel having limiter of melt metal draining at one end of block in the form of stationary end plate; metal duct for supplying melt metal into inter-roll vessel; timing rotation drive unit; drawing rolls and unit for discharging strips for their further working. Aggregate also includes mechanism for regulating gap between blocks of rolls-crystallizers according to thickness of strip; intermediate vessel and unit for applying onto surface of rolls-crystallizers material non-wetted by melt metal. Block of rolls-crystallizers is arranged on panel formed by means of upper and lower plates rigidly joined one to other.

EFFECT: stable process of making thin strips with uniform macrostructure, enlarged manufacturing possibilities of aggregate, less loss of yield.

3 cl, 4 dwg

Up!