Method for cross-taper rolling of article with elongated axis

FIELD: plastic working of metals, possibly manufacture of articles with elongated axis.

SUBSTANCE: method comprises steps of heating initial blank and feeding it to rolling stand; controlling temperature in position of starting deformation; shaping article in predetermined temperature range; then removing article from rolling stand and realizing additional temperature control of blank while deforming blank after removing it from rolling stand; measuring value real temperature range of rolling process; comparing said temperature range with predetermined value; then increasing and(or) decreasing heating temperature of initial blank in limit of predetermined temperature range depending upon change value of temperature range of rolling process. Deformation rate at cross-taper rolling is changed in range 28-150 m/min according to temperature change of rolled blank.

EFFECT: improved quality of rolled products, prevention of possibility of opening cavity in axial zone.

2 cl, 2 dwg

 

The invention relates to the processing of metals by pressure, in particular to the cross-wedge rolling, and can be used in the production of parts with a long axis, obtained by rolling, as well as for pre-profiling of workpieces for subsequent low-stamping.

There is a method of cross-wedge rolling, comprising preheating the original piece, the flow of the heated billet in a rolling mill and rolling, in which improving the accuracy of rolled products is achieved by maintaining a constant thermal regime in rolling stands [1].

The disadvantage of this method is that, stabilizing thermal condition of rolling stands, do not consider and does not compensate for loss of heat rolled blank in contact with tools rolling. The change in thermal state of the rolled blank during its deformation reduces the accuracy of rolling.

There is a method of rolling metal in which the changes of temperature of the heat source of the workpiece depending on the change of the output parameter is the distance between the instruments, measured in the rolling process [2].

A known method can improve the accuracy of rolling due to accounting errors rolling caused by the heating of the instrument and details of rolling stands.

The disadvantage of this method [2]as well as [1], is that in the rolling process does not take into account the change in thermal state of the rolled blank, which leads to lower accuracy due to the variation of the magnitude of thermal shrinkage and can cause the opening of the cavity, for example, while significantly lowering the temperature of a separate section of rolled blank.

The problem of increasing the accuracy of rolling solved in the way of cross-wedge rolling products with a long axis, comprising heating the original piece, the flow of the heated billet in a rolling mill to the position of the beginning of deformation, the input temperature control of the heating source of the workpiece at the starting position of the deformation, the profiling of the product within the specified temperature range and the destruction of laminated articles of rolling stands. This method of cross-wedge rolling products with a long axis, taken as a prototype, implemented on automatic lines hot cross-wedge rolling of the company "AMT engineering" [3].

The known method [3] to improve accuracy, rolling through the implementation of the input control the heating temperature of the original piece by a pyrometer adapted to the conditions of the procurement of scale, and reduction of the time thermodynamic stabilization is the process of rolling due to the intensive water cooling of all parts of the rolling mill, contact with hot material.

The disadvantage of the prototype is that the rolling is carried out in a predetermined controlled temperature hot or Polygonaceae deformation, but at the same time control the temperature interval of heating of the original piece and do not control the temperature of the rolled blank and laminated products. The lack of temperature control rolled blank during its deformation cannot guarantee high precision rolled products due to the possibility of a significant variation of the magnitude of thermal shrinkage (the temperature of the laminated product according to the design features of the instrument and technological modes of rolling, may differ significantly from the temperature of the initial billet up to 300°).

In addition, when rolling hard-deformable and less-plastical alloys rolling must be carried out in the optimum, the narrow interval of temperature of deformation. Lowering the temperature of rolled billets outside the optimum range of temperature of deformation leads to a decrease in ductility and increase the resistance to deformation of the metal of the workpiece, which, in turn, reduces the stock of plasticity remaining in the workpiece, to complete the formation process of the product. The process of cross-wedge p is akadi due to the accumulation of large deformations in the axial portion of the workpiece and reducing the ductility of the material due to the reduction of the temperature of the workpiece during rolling can lead to axial collapse of metal in the opening of the cavity in the axial zone of the workpiece, known as "the Mannesmann effect".

The basis of the invention is to improve the quality of rolled products with a long axis by increasing the dimensional accuracy and eliminate the possibility of the opening of the cavity in the axial zone.

This object is achieved in that in the method of cross-wedge rolling products with a long axis, comprising heating the original piece, the flow of the heated billet in a rolling mill to the position of the beginning of deformation, the input temperature control of the heating source of the workpiece at the starting position of the deformation, the profiling of the product within the specified temperature range and the destruction of laminated articles of rolling stands, according to the invention the profile of the product of cross-wedge rolling is carried out in isothermal mode with additional control of the temperature of the rolled blank during its deformation and laminated products after removing it from the rolling stands and measure the actual temperature interval of rolling, which is compared with the specified intervals, and depending on the magnitude of the temperature interval rolling increase or decrease, respectively, the rate of deformation and/or reduce the temperature of the heating source of the workpiece within a given te the temperature interval.

In the way of change of speed of deformation when ploskonosova scheme rolling carry out within 28-150 m/min corresponding to the temperature change of rolled blank.

Distinctive features and the technical result are interconnected in a causal relation, i.e. a set of new signs with no clearly improves the quality of the product by improving the dimensional accuracy and eliminate the possibility of the opening of the cavity in the axial zone, which indicates the method according to the criterion of "inventive step".

For a better understanding of the invention this may be explained by the drawings, where

figure 1 - scheme of the technological line of hot cross-wedge rolling,

figure 2 - graph of the dynamics of temperature changes rolled blank during its deformation at different speeds rolling.

The method is carried out on the example of the production line of hot cross-wedge rolling of figure 1, which contains a device 1 for accumulation and delivery of blanks, mechanism 2 transmission of material in the inductor, the induction heater 3, the feed mechanism 4 is heated billet in a rolling mill the rolling mill on the position of the beginning of deformation, the mill 5 cross-wedge rolling mechanism 6 remove the laminated articles of rolling stands and system 7 automatic control of the line.

The sensors 9, 12 and 13 of the heating temperature of the workpiece (the original and laminate) and articles connected together with the knob 17 temperature interval rolling on the input device 18 of the comparison, and outputs associated with the actuating elements of the mill 5 cross-wedge rolling, changing the rolling speed, and an induction heater 3, which changes the temperature of the original piece.

The change of speed of deformation is carried out, for example, proportional directional flow of the fluid supplied to the power cylinder mill 5 cross-wedge rolling.

The temperature change of the heat source procurement is carried out by adjusting the heating mode, for example, by changing the voltage of the inductor induction naked is avatele 3, in which the heated billet.

Production line of hot cross-wedge rolling of figure 1 operates as follows.

The original piece from the device 1 for storing and issuing of parts in the automatic mode, the engine 2 piece serving in the inductor induction heater 3. By passing through the coil of the workpiece is heated to a temperature of maximum values of the specified temperature range of the heat source procurement and mechanism 4 submit heated workpiece 10 in the rolling mill 16 mill 5 at position 11 of the beginning of deformation, where they perform input control heating temperature of the original piece by the temperature sensor 9.

Then the original billet rolled in isothermal mode, maintaining the specified temperature range, by additional control of the temperature of the rolled workpiece 14 during its deformation by the temperature sensor 12 and laminated products 15 after removing it from the rolling stands 16 sensor 13 temperature. Electrical signals from the sensors 9, 12 and 13 temperature enter the device 18 comparison (control change) temperature interval rolled blanks with the given temperature interval. The difference of the respective signals, determining the change in temperature interval, enters the system which it controls a proportional valve of the fluid flow, supplied to the power cylinder mill 5 cross-wedge rolling, which leads to an increase or decrease, respectively, the speed of deformation.

Cross-wedge rolling parts with a long axis of the piece billet mills with a flat tool and the rate of deformation 28-40 m/min, usually accompanied by a decrease in heating temperature of the billet mainly due to heat transfer to the tool and the environment. In this case, the difference of the electrical signals, determining the change in temperature interval, will form a management team to increase the rolling speed, which in turn will reduce the heat loss of the workpiece by reducing the time of deformation and increase the temperature of the rolled blank due to thermal effect of plastic deformation.

The change of speed of deformation when ploskonosova scheme rolling in accordance with the proposed method is carried out within 28-150 m/min corresponding to the temperature change of rolled blank.

Thus, the input temperature control of the heating source of the workpiece at the starting position of the deformation and additional temperature control rolled blank during its deformation and laminated products after removing it from the rolling stands allow osushestvlyaetsya value of the given temperature interval rolling.

Depending on the magnitude of the temperature interval change - increase or decrease, respectively, the speed of deformation of the rolled blank for the implementation of the isothermal mode of rolling the workpiece in a predetermined temperature range.

The change of speed of deformation is possible not only to achieve a significant reduction in the temperature interval of heating the rolled blank, but, ideally, save the original value of the heating temperature of the workpiece during its deformation.

The decrease in the temperature interval of heating the rolled blank, in turn, lowers the temperature of the heat source of the workpiece within a given temperature interval proportionate reduction (to reduce the maximum value of the heating temperature of the original piece within a given temperature interval).

In a production line of hot cross-wedge rolling of figure 1 reduction of temperature of the heat source procurement is carried out by adjusting the heating mode due to a change in voltage of the inductor induction heater 3, in which the heated billet, the command generated by the device 18 comparison (control change) temperature interval rolled blanks with the given temperature interval. The temperature of the load, the VA of the original piece adequately reduce the actual decrease in the temperature interval of heat rolled blank.

Pilot testing of the claimed method was carried out by rolling products made of brass drugs 59-1 optimum temperature deformation 690-750°C.

Rolled products "Stem valve, brass billets ⊘12×65 mm on known and applied technologies.

By known techniques rolling was carried out on the mill cross-wedge rolling flat tool with a constant rate of deformation within 28-40 m/min

The original billet was heated to a temperature of 750°and rolled in automatic mode. Rolling was accompanied by lowering the temperature of the rolled blank beyond the optimal range of temperature (figure 2, curve 1), which led to the marriage by reason of the opening of the cavity in the axial zone of the laminated product. The opening of the cavity was observed in every second laminated product.

Rolling limit for this equipment the speed of deformation of 40 m/min reduced the number of defective items, but did not exclude the possibility of opening cavity, as heat loss in the rolled stocking remained significant. When rolling, it was possible to visually observe how the transition to a subsequent rolling step products with a greater degree of compression rolled billet was getting dark, decreased its heating temperature. Maximally reduce the marriage was only after changing the tool geometry rolling.

On the claimed technology source procurement was also heated to a temperature of 750°and rolled in automatic mode with the possibility to change the speed of deformation within 28-150 m/min and a heating temperature of the original piece.

In the rolling process in accordance with the claimed method was carried out by the input temperature control of the heating source of the workpiece at the starting position of the deformation and additional temperature control rolled blank during its deformation and laminated products after removing it from the rolling stands. Depending on the magnitude of the temperature interval rolled blanks cheated on strain rate and temperature of the original piece.

Stabilization of the temperature regime rolling was achieved when the rolling speed of 80 m/min (figure 2, curve 2) and the heating temperature of the original piece, 750°With the interval of heating the workpiece in the process of deformation decreased to (750-720)°at a given temperature interval rolling - (750-690)°C.

In accordance with the claimed method reduced the temperature of the original piece within a given temperature interval adequate to reduce the interval of heating the rolled blank to 720°C, while the temperature of the rolled blank in the process e is the strain was maintained within (720-700)° (Figure 2, curve 3).

The party rolled products (500 pieces) all products are in full compliance with the drawing. Profiling was carried out in the isothermal mode of cross-wedge rolling of the workpiece in the temperature range 720-700°C.

As follows from the comparative analysis of known and stated ways profiling products in the isothermal mode of cross-wedge rolling improves quality products with a long axis by increasing the dimensional accuracy due to the lower temperature interval rolling and, therefore, the values of thermal shrinkage and prevent opening of the cavity in the axial zone.

The inventive method of cross-wedge rolling products with a long axis can also reduce heating costs of the original piece, so as to reduce the interval of heating temperature of rolled blank allows to decrease the value of the upper interval of the heating temperature of the original piece.

Industrial use of the method suggested in the Republic of Belarus and the CIS.

The sources of information.

1. A.S. 617140 of the USSR, M. CL.2VN 1/18, WV 37/10. Mill for cross-wedge rolling.

2. A.S. 747548 of the USSR, M. CL.2WV 37/08, VN 1/18. Method of rolling metal.

3. Rudovich S.A., closin VA Technology and equipment cross-Klinova the rolling // Technical almanac "NM-equipment", No. 1, 2005, M.: OOO "Print center "national metallurgy, p.45-48.

1. The method of cross-wedge rolling products with a long axis, comprising heating the original piece, the flow of the heated billet in a rolling mill to the position of the beginning of deformation, the input temperature control of the heating source of the workpiece at the starting position of the deformation, the profiling of the product within the specified temperature range and the destruction of laminated articles of rolling stands, characterized in that the profiling of the product of cross-wedge rolling is carried out in isothermal mode with additional control of the temperature of the rolled blank during its deformation and laminated products after removing it from the rolling stands and measure the actual temperature interval of rolling, which is compared with a preset interval, and according to the magnitude of the temperature interval rolling increase or decrease the rate of deformation and/or reduce the temperature of the heating source of the workpiece within a given temperature interval.

2. The method according to claim 1, characterized in that the change of speed of deformation when ploskonosova scheme of cross-wedge rolling is carried out within 28-150 m/min in accordance with the temperature change of rolled blank.



 

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