JP2018176210A - Device and method for estimating temperature distribution inside extrusion product during hot extrusion processing, device and method for controlling billet heating, and program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a device and a method for highly accurately estimating temperature distribution inside an extrusion product during hot extrusion processing.SOLUTION: Provided is a device 10 for estimating temperature distribution inside an extrusion product during hot extrusion, the device 10 applying hot extrusion processing to a billet under conditions of a predetermined extrusion speed and extrusion force, and estimating temperature distribution inside an extrusion product in its longitudinal direction when the extrusion product is manufactured. The device comprises: a setting section 1 for setting plural temperature distributions of the extrusion product in its longitudinal direction; a calculation section 2 for calculating time sequence data of plural extrusion speed estimation values and plural extrusion force estimation values, for each of the plural temperature distributions; an extraction section 3 for extracting one temperature distribution corresponding to optimal time sequence data, by comparing the time sequence data of the plural extrusion speed estimation values and the plural extrusion force estimation values with time sequence data of extrusion speed actual values and extrusion force actual values; and a determination section 4 for determining the one temperature distribution as a temperature distribution inside the extrusion product in its longitudinal direction.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an extruded product internal temperature distribution estimation device and a method for estimating the extruded product internal temperature distribution during hot extrusion processing, a billet heating control device, a billet heating control method, and a program.

  Hot extrusion is often used as one of the methods for producing metal workpieces such as carbon steel, stainless steel, aluminum alloy or copper alloy. In the hot extrusion process, after heating a billet as a material, the billet is inserted into a container, and the billet is extruded with a ram toward a die to obtain an extruded product having a desired shape.

  In hot extrusion processing, the generation of flaws on the outer and inner surfaces of the extruded product, called cross-cutting, caused by an excessive increase in temperature of the extruded product becomes a problem.

  For example, in Patent Document 1, the die setting temperature of the billet is controlled so that the extrusion load (ram load) applied from the ram to the billet is reduced at a constant rate as the extrusion proceeds. There is disclosed an extrusion method capable of maintaining the quality of the extruded material highly and stably while keeping the temperature of the extruded product extruded from a constant temperature.

JP, 2009-248188, A

  By the way, one of the operation problems in the hot extrusion processing includes an abrupt change in extrusion speed (overshoot) at the initial stage of extrusion and an increase in pressing power. When overshoot occurs at the initial stage of extrusion, the processing calorific value becomes excessive, which results in the occurrence of cross breakage on the outer inner surface of the extruded product. In addition, if the equipment constraint is exceeded due to an increase in pushing power, a major problem such as clogging during processing (half pressing) or destruction of the equipment in the worst case may occur.

  Lowering the heating temperature is effective in order to suppress the risk of occurrence of cross-cutting, while increasing the heating temperature is effective in reducing the maximum pressing power. That is, both are in a trade-off relationship, and trial and error are required to find the optimal operating conditions.

  Therefore, in order to find the optimum heating conditions efficiently, it is important to be able to accurately grasp the temperature of the extruded product after extrusion processing. However, it is difficult to accurately measure the internal temperature of the extruded product, and there are technical hurdles in estimating the internal temperature distribution from the measurement results of the surface temperature.

  Therefore, there is a need for a method of estimating the internal temperature distribution of the extruded product. Furthermore, by optimizing the billet heating conditions based on the estimation result, improvement effects on the quality side (outside internal flaw suppression) and the operation side (stable operation) can be expected.

  According to Patent Document 1, although it is supposed that the temperature of the product at the time of hot working can be kept constant, there is no disclosure at all about a method of estimating the internal temperature distribution.

  An object of the present invention is to solve the above-mentioned problems and to provide an apparatus and method for estimating the temperature distribution inside an extruded product with high accuracy during hot extrusion processing.

  The present invention has been made to solve the above problems, and an apparatus for estimating the internal temperature distribution of an extruded product during hot extrusion processing and a method for estimating the internal temperature distribution of an extruded product, a billet heating control apparatus, and a billet heating control Methods and programs are summarized.

(1) A device for performing hot extrusion processing on a billet under conditions of a predetermined extrusion speed and pressing force to estimate an internal temperature distribution in a longitudinal direction of the extruded product when an extruded product is manufactured, ,
A setting unit configured to set a plurality of temperature distributions in the longitudinal direction of the extruded product;
For each of the plurality of temperature distributions set by the setting unit, the plurality of extrusion speed estimated values and the plurality of extrusion speed values are determined based on the information including the temperature distribution and the predetermined extrusion speed change target value and push output change target value. A calculation unit that calculates time series data of the push output estimated value;
The time series data of the plurality of extrusion speed estimated values and the plurality of push output estimated values obtained by the calculation unit are compared with the time series data of the extrusion speed actual value and the push output actual value, and the extrusion speed estimated value And an extraction unit for extracting one temperature distribution corresponding to optimal time-series data of push output estimation values,
Determining the one temperature distribution extracted by the extraction unit as an internal temperature distribution in the longitudinal direction of the extruded product;
Internal temperature distribution estimation device for extruded products during hot extrusion processing.

(2) The setting unit performs setting of the plurality of temperature distributions a plurality of times, and performs setting of the temperature distribution after the second time based on the one temperature distribution extracted by the extracting unit.
The extrusion product internal temperature distribution estimation apparatus at the time of the hot extrusion processing as described in said (1).

(3) The setting unit performs setting of the second and subsequent temperature distributions using a particle swarm optimization method.
The extrusion product internal temperature distribution estimation apparatus at the time of the hot extrusion processing as described in said (2).

(4) A method of performing hot extrusion processing on a billet under conditions of a predetermined extrusion speed and pressing force to estimate an internal temperature distribution in the longitudinal direction of the extruded product when an extruded product is manufactured, ,
(A) setting a plurality of temperature distributions in the longitudinal direction of the extruded product;
(B) For each of the plurality of temperature distributions set in the step (a), a plurality of extrusions based on information including the temperature distribution and predetermined extrusion speed change target values and push output change target values. Calculating time-series data of a velocity estimate and a plurality of push output estimates;
(C) comparing the time series data of the plurality of extrusion speed estimated values and the plurality of push output estimated values obtained in the step (b) with the time series data of the extrusion speed actual value and the push output actual value Extracting one temperature distribution corresponding to the optimal time-series data of the extrusion speed estimate and the push output estimate;
(D) determining the one temperature distribution extracted in the step (c) as an internal temperature distribution in the longitudinal direction of the extruded product;
Method of estimating the temperature distribution inside the extruded product during hot extrusion processing.

(5) In the step (a), the setting of the plurality of temperature distributions is performed a plurality of times, and the setting of the temperature distribution for the second and subsequent times is performed based on the one temperature distribution extracted by the extracting unit. ,
The extruded product internal temperature distribution estimation method at the time of the hot extrusion processing as described in said (4).

(6) In the step (a), setting of the second and subsequent temperature distributions is performed using a particle swarm optimization method.
The extruded product internal temperature distribution estimation method at the time of the hot extrusion processing as described in said (5).

(7) A device for controlling the billet heating temperature during hot extrusion processing,
The extruded product internal temperature distribution estimating device according to any one of (1) to (3) above,
And a temperature control unit,
The temperature control unit is an extrusion speed calculated using information including the temperature distribution of the extruded product estimated by the extruded product internal temperature distribution estimation device, the extrusion speed change target value, and the push output change target value. Based on time series data of estimated value and push output estimated value,
If the maximum value of the extrusion rate estimated value exceeds a preset value, the heating temperature of the billet is lowered,
If the maximum value of the estimated push output value exceeds the value set in advance, the heating temperature of the billet is raised.
Billet heating control device.

(8) A method of controlling the billet heating temperature during hot extrusion processing,
Steps (a) to (d) described in any of (4) to (6) above,
(E) changing the heating temperature of the billet,
In the step (e), the extrusion calculated using information including the temperature distribution of the extruded product determined in the step (d) and the extrusion speed change target value and the push output change target value Based on time series data of speed estimate and push output estimate
If the maximum value of the extrusion rate estimated value exceeds a preset value, the heating temperature of the billet is lowered,
If the maximum value of the estimated push output value exceeds the value set in advance, the heating temperature of the billet is raised.
Billet heating control method.

(9) In order to estimate the internal temperature distribution in the longitudinal direction of the extruded product at the time of producing the extruded product by subjecting the billet to hot extrusion processing at a predetermined extrusion speed and pushing force condition by a computer The program of
On the computer
(A) setting a plurality of temperature distributions in the longitudinal direction of the extruded product;
(B) For each of the plurality of temperature distributions set in the step (a), a plurality of extrusions based on information including the temperature distribution and predetermined extrusion speed change target values and push output change target values. Calculating time-series data of a velocity estimate and a plurality of push output estimates;
(C) comparing the time series data of the plurality of extrusion speed estimated values and the plurality of push output estimated values obtained in the step (b) with the time series data of the extrusion speed actual value and the push output actual value Extracting one temperature distribution corresponding to the optimal time-series data of the extrusion speed estimate and the push output estimate;
(D) determining the one temperature distribution extracted in the step (c) as an internal temperature distribution in the longitudinal direction of the extruded product.
program.

(10) In the step (a), the setting of the plurality of temperature distributions is performed a plurality of times, and the setting of the temperature distribution for the second and subsequent times is performed based on the one temperature distribution extracted by the extracting unit. ,
The program as described in said (9).

(11) In the step (a), setting of the temperature distribution after the second time is performed using a particle swarm optimization method.
The program described in (10) above.

(12) A program for controlling the billet heating temperature during hot extrusion processing by a computer,
On the computer
Steps (a) to (d) described in any one of (9) to (11) above;
(E) changing the billet heating temperature;
In the step (e), the extrusion calculated using information including the temperature distribution of the extruded product determined in the step (d) and the extrusion speed change target value and the push output change target value Based on time series data of speed estimate and push output estimate
If the maximum value of the extrusion rate estimated value exceeds a preset value, the heating temperature of the billet is lowered,
If the maximum value of the estimated push output value exceeds the value set in advance, the heating temperature of the billet is raised.
program.

  According to the present invention, it is possible to estimate the temperature distribution inside the extruded product at the time of hot extrusion processing with high accuracy. Also, based on the estimated temperature distribution inside the extruded product, it becomes possible to appropriately control the heating temperature of the billet.

FIG. 1 is a view showing a schematic configuration of an extruded product internal temperature distribution estimation apparatus according to an embodiment of the present invention. FIG. 2 is a view showing a schematic configuration of an extruder provided with an extruded product internal temperature distribution estimation apparatus. FIG. 3 is a diagram for explaining an example of the configuration of a simulation model. FIG. 4 is a view showing a schematic configuration of a billet heating control device according to an embodiment of the present invention. FIG. 5 is a view showing a schematic configuration of an extruder provided with a billet heating control device. FIG. 6 is a flow chart showing a method of estimating the temperature distribution inside the extruded product according to an embodiment of the present invention. FIG. 7 is a flow chart showing a billet heating control method according to an embodiment of the present invention.

  1 to 7 for an extruded product internal temperature distribution estimating apparatus and an extruded product internal temperature distribution estimating method, a billet heating control apparatus, and a billet heating control method and program according to an embodiment of the present invention. While explaining.

  FIG. 1 is a view showing a schematic configuration of an extruded product internal temperature distribution estimation apparatus according to an embodiment of the present invention. The extruded product internal temperature distribution estimation apparatus performs hot extrusion processing on the billet at predetermined extrusion speed and pressing force conditions, and estimates the internal temperature distribution in the longitudinal direction of the extruded product when the extruded product is manufactured Device.

  Here, in the present invention, the temperature inside the extruded product means the average temperature in a cross section perpendicular to the longitudinal direction of the extruded product, and the temperature distribution is the distribution of the average temperature at different distances from the tip of the extruded product. Means

  Moreover, FIG. 2 is a figure which shows schematic structure of the extruder 200 provided with the extrusion product internal temperature distribution estimation apparatus 10. As shown in FIG. As shown in FIG. 2, in addition to the extruded product internal temperature distribution estimation device 10, the extruder 200 includes a main cylinder 210, a piercer cylinder 215, a main ram 220, a piercer ram 225, a mandrel 230, a container 240, a die 250, and a die. A holder 255, a main valve 260, a piercer valve 265, a main pressure detector 270, a piercer pressure detector 275, and a speed detector 280 are provided.

  In the hot extrusion process, first, a hollow billet (not shown) is heated and then inserted into the container 240, and the mandrel 230 is inserted into the hollow portion of the billet. Then, the extruded product is obtained by performing extrusion processing toward the die 250 with the main ram 220 from that state.

  The main cylinder 210 moves the main ram 220 to the left in the figure by supplying the high pressure fluid pressurized by an accumulator (not shown) through the main valve 260.

  Further, a main pressure detector 270 and a piercer pressure detector 275 are connected to the main cylinder 210 and the piercer cylinder 215, respectively. By detecting the pressure inside the main cylinder 210 and the piercer cylinder 215, the pushing power applied to the billet during hot extrusion processing is measured, and the value is input to the extruded product internal temperature distribution estimation device 10.

  Further, a speed detector 280 is connected to the main ram 220. By detecting the moving speed of the main ram 220, the extrusion speed of the billet at the time of hot extrusion processing is measured, and the value is input to the extruded product internal temperature distribution estimation apparatus 10.

  As shown in FIG. 1, the extruded product internal temperature distribution estimation apparatus 10 includes a setting unit 1, a calculation unit 2, an extraction unit 3, and a determination unit 4.

  The setting unit 1 sets a plurality (np pieces) of temperature distribution in the longitudinal direction of the extruded product. Then, the calculation unit 2 obtains time-series data of the billet extrusion speed estimated value and the push output estimated value based on the temperature distribution set by the setting unit 1 and information including the extrusion speed change target value and the push output change target value. Calculate

  The extrusion speed change target value and the push output change target value are target values of the extrusion speed change and push output change from the start of extrusion to the end of extrusion, which are predetermined, and are represented as time-series data. Further, time-series data means a series of data for each predetermined time from the start of extrusion to the end of extrusion.

  Time series data of the extrusion speed estimated value and the push output estimated value described above are calculated for each of np temperature distributions. That is, np calculations are performed, and np pieces of time series data of the extrusion speed estimated value and time series data of the pressing output estimated value are obtained.

  There is no restriction | limiting in particular about the calculation method of time series data of extrusion speed estimated value and pushing power output estimated value, For example, it can calculate with a simulation model which shows a structure in FIG. Also, for example, MATLAB / Simulink manufactured by MathWorks can be used for the simulation.

  The extraction unit 3 compares the time series data of the np extrusion speed estimated values and the np push output estimated values obtained by the calculation unit 2 with the time series data of the extrusion speed actual value and the push output actual value. . Then, optimal time-series data of the extrusion speed estimated value and the push output estimated value is selected, and one temperature distribution corresponding thereto is extracted.

  As the time series data of the extrusion speed actual value and the push output actual value, data inputted from the above-mentioned main pressure detector 270, piercer pressure detector 275 and speed detector 280 can be used.

  There is no particular limitation on the method of selecting the optimum time series data of the extrusion speed estimate and the push output estimate. For example, the actual value and the estimated value are compared with respect to one or more indexes selected from the maximum value of extrusion speed and the maximum value of push output, and the time corresponding to the maximum value, and the mean square error is Time series data of the extrusion speed estimated value and the push output estimated value which become minimum can be selected. In the case where a plurality of the above-mentioned indices are adopted, important indices may be appropriately weighted and compared.

  The determination unit 4 determines one temperature distribution extracted by the extraction unit 3 as an internal temperature distribution in the longitudinal direction of the extruded product.

The setting unit 1 preferably performs setting of the temperature distribution a plurality of times (k _max times). At this time, it is preferable to set the second and subsequent temperature distributions based on one temperature distribution extracted by the extraction unit 3. This improves the estimation accuracy and makes it possible to obtain an estimated value closer to the true value.

Moreover, when setting the temperature distribution k _max times, it is preferable to perform setting of the temperature distribution for the second and subsequent times using Particle Swarm Optimization (PSO). PSO is one of the multi-objective optimization methods.

  The first setting of the temperature distribution may be performed by any method. For example, a random number may be adopted.

  FIG. 4 is a view showing a schematic configuration of a billet heating control device according to an embodiment of the present invention. As shown in FIG. 4, the billet heating control device 100 includes an extruded product internal temperature distribution estimation device 10 and a temperature control unit 20.

  Moreover, FIG. 5 is a figure which shows schematic structure of the extruder 300 provided with the billet heating control apparatus 100. As shown in FIG. The configuration of the extruder 300 is the same as the configuration of the extruder 200 shown in FIG. 2, but further includes a billet heater 245. The billet heater 245 adjusts the heating temperature of the billet in accordance with an instruction from the temperature control unit 20. The billet heater 245 preferably has a function capable of so-called "tilted heating" to adjust the heating temperature in the billet longitudinal direction.

  The temperature control unit 20 estimates the extrusion speed calculated using information including the temperature distribution of the extruded product estimated by the extruded product internal temperature distribution estimation device 10 and the extrusion speed change target value and the push output change target value described above. Control of the heating temperature of the billet is performed based on time-series data of the value and the push output estimated value.

  Specifically, when the maximum value of the extrusion speed estimated value exceeds the value set in advance, the heating temperature of the billet is lowered, and the maximum value of the pressure output estimation value exceeds the value set in advance. Performs control to raise the heating temperature of the billet.

  Next, a method of estimating the temperature distribution inside the extruded product according to an embodiment of the present invention will be described with reference to FIG. FIG. 6 is a flow chart showing a method of estimating the temperature distribution inside the extruded product according to an embodiment of the present invention. In the following description, although the case of adopting PSO is taken as an example, the present invention is not limited to this.

As shown in FIG. 6, the setting unit 1 sets np temperature distributions x _i (i = 1 to np) by using random numbers (step A1). In setting the temperature distribution x _i is defined as the temperature coordinate with one particle in accordance with the distance from the tip of the extruded product.

Next, the calculation unit 2 calculates np times by np simulations based on information including the ^kth temperature distribution x _i ^k set by the setting unit 1 and the extrusion speed change target value and the push output change target value. The time-series data of the billet extrusion speed estimation value and the push output estimation value are calculated (step A2).

Next, the extraction unit 3 evaluates the evaluation function f (x (x) with the time series data of the np extrusion speed estimated values and the np push output estimated values, and the extrusion speed actual value and the pressure output actual value. _i ^k) compared with (step A3). The evaluation function f (x i ^_k), between the actual measurement value and the estimated value, the maximum value of the maximum value and the extrusion force of the extrusion rate, and the average of one or more selected from the time corresponding to the maximum value thereof 2 Multiplication error can be used.

Next, the extraction unit 3 determines, from among the np-time simulation results, the coordinates of the particle at which the evaluation function f (x _i ^k ) is minimized, the optimum points x _i ^{best, k of the} individual and the optimum points x _{swarm of the} group ^{The best, k} are extracted (step A4).

When the setting of the temperature distribution is equal to or less than the k _max (in the case of No at step A5), the setting unit approaches the extracted optimum points x _i ^{best, k} and the optimum points x _swarm ^{best, k} of the group The np temperature distributions are updated (step A6), and time-series data of the extrusion speed estimated value and the push output estimated value of the np billets are calculated again (step A2).

If the setting of the temperature distribution exceeds the k _max (Yes in step A5), the determination unit 4 determines the temperature distribution (step A7). At this time, the optimum point of the k _max -th group is adopted as the temperature distribution.

  Next, a billet heating control method according to an embodiment of the present invention will be described with reference to FIG. FIG. 7 is a flow chart showing a billet heating control method according to an embodiment of the present invention.

  As shown in FIG. 7, the extruded product internal temperature distribution estimation apparatus 10 uses the information including the estimated temperature distribution of the extruded product and the extrusion speed change target value and the push output change target value to estimate the extrusion speed and push output. Time series data of the estimated value is calculated (step B1).

Next, the temperature control unit 20 obtains the maximum value OS _sim of the extrusion speed estimated value and the maximum value P _t p _sim of the pressing output estimated value (step B2).

Then, when the maximum value OS _sim of the extrusion speed estimated value exceeds the value OS _max set in advance (in the case of No in step B3), the temperature control unit 20 performs control to lower the heating temperature of the billet ( Step B4). If the maximum value Ptp _{sim of the} estimated push output value exceeds the value Ptp _max set in advance (in the case of No at step B5), control is performed to raise the heating temperature of the billet (step B6).

The maximum value OS _sim of the extrusion speed estimated value is less than or equal to a preset value OS _max (in the case of Yes in step B3), and the maximum value Ptp _sim of the push output estimated value is less than or equal to a preset value Ptp _max If there is (Yes in step B5), the temperature control unit 20 maintains the heating temperature (step B7).

  A program according to an embodiment of the present invention may be a program that causes a computer to execute steps A1 to A7 shown in FIG. By installing this program in a computer and executing it, the extruded product internal temperature distribution estimation device 10 according to the present embodiment can be realized. In this case, a central processing unit (CPU) of the computer functions as the setting unit 1, the calculation unit 2, the extraction unit 3, and the determination unit 4 to perform processing.

  Moreover, the program which concerns on other embodiment of this invention should just be a program which makes a computer perform step B1-B7 shown in FIG. By installing this program in a computer and executing it, the billet heating control device 100 in the present embodiment can be realized. In this case, a central processing unit (CPU) of the computer functions as the extruded product internal temperature distribution estimation device 10 and the temperature control unit 20 to perform processing.

  According to the present invention, it is possible to estimate the temperature distribution inside the extruded product at the time of hot extrusion processing with high accuracy. Also, based on the estimated temperature distribution inside the extruded product, it becomes possible to appropriately control the heating temperature of the billet.

Reference Signs List 1 setting unit 2 calculation unit 3 extraction unit 4 determination unit 10 extruded product internal temperature distribution estimation device 20 temperature control unit 100 billet heating control device 200 extruder 210 main cylinder 215 piercer cylinder 220 main ram 225 piercer ram 230 mandrel 240 container 245 billet Heater 250 dice 255 dice holder 260 main valve 265 piercer valve 270 main pressure detector 275 piercer pressure detector 280 speed detector 300 extruder

Claims (12)

A device for performing hot extrusion processing on a billet under conditions of predetermined extrusion speed and pressing force to estimate the temperature distribution inside the extruded product in the longitudinal direction when the extruded product is manufactured,
A setting unit configured to set a plurality of temperature distributions in the longitudinal direction of the extruded product;
For each of the plurality of temperature distributions set by the setting unit, the plurality of extrusion speed estimated values and the plurality of extrusion speed values are determined based on the information including the temperature distribution and the predetermined extrusion speed change target value and push output change target value. A calculation unit that calculates time series data of the push output estimated value;
The time series data of the plurality of extrusion speed estimated values and the plurality of push output estimated values obtained by the calculation unit are compared with the time series data of the extrusion speed actual value and the push output actual value, and the extrusion speed estimated value And an extraction unit for extracting one temperature distribution corresponding to optimal time-series data of push output estimation values,
Determining the one temperature distribution extracted by the extraction unit as an internal temperature distribution in the longitudinal direction of the extruded product;
Internal temperature distribution estimation device for extruded products during hot extrusion processing. The setting unit sets the plurality of temperature distributions a plurality of times, and performs setting of the second and subsequent temperature distributions based on the one temperature distribution extracted by the extraction unit.
The extruded product internal temperature distribution estimation device during hot extrusion processing according to claim 1. The setting unit performs setting of the temperature distribution after the second time using a particle swarm optimization method.
The extruded product internal temperature distribution estimation device during hot extrusion processing according to claim 2. A method of performing hot extrusion processing on a billet under conditions of a predetermined extrusion speed and pressing force, and estimating an internal temperature distribution in a longitudinal direction of the extruded product when an extruded product is manufactured,
(A) setting a plurality of temperature distributions in the longitudinal direction of the extruded product;
(B) For each of the plurality of temperature distributions set in the step (a), a plurality of extrusions based on information including the temperature distribution and predetermined extrusion speed change target values and push output change target values. Calculating time-series data of a velocity estimate and a plurality of push output estimates;
(C) comparing the time series data of the plurality of extrusion speed estimated values and the plurality of push output estimated values obtained in the step (b) with the time series data of the extrusion speed actual value and the push output actual value Extracting one temperature distribution corresponding to the optimal time-series data of the extrusion speed estimate and the push output estimate;
(D) determining the one temperature distribution extracted in the step (c) as an internal temperature distribution in the longitudinal direction of the extruded product;
Method of estimating the temperature distribution inside the extruded product during hot extrusion processing. In the step (a), the setting of the plurality of temperature distributions is performed a plurality of times, and the setting of the temperature distribution after the second time is performed based on the one temperature distribution extracted by the extracting unit.
The method for estimating the internal temperature distribution of an extruded product during hot extrusion processing according to claim 4. In the step (a), setting of the temperature distribution after the second time is performed using a particle swarm optimization method.
The method for estimating the internal temperature distribution of an extruded product during hot extrusion processing according to claim 5. An apparatus for controlling the heating temperature of a billet during hot extrusion processing, comprising:
An extruded product internal temperature distribution estimation device according to any one of claims 1 to 3;
And a temperature control unit,
The temperature control unit is an extrusion speed calculated using information including the temperature distribution of the extruded product estimated by the extruded product internal temperature distribution estimation device, the extrusion speed change target value, and the push output change target value. Based on time series data of estimated value and push output estimated value,
If the maximum value of the extrusion rate estimated value exceeds a preset value, the heating temperature of the billet is lowered,
If the maximum value of the estimated push output value exceeds the value set in advance, the heating temperature of the billet is raised.
Billet heating control device. A method of controlling the billet heating temperature during hot extrusion processing, comprising:
Steps (a) to (d) described in any one of claims 4 to 6;
(E) changing the heating temperature of the billet,
In the step (e), the extrusion calculated using information including the temperature distribution of the extruded product determined in the step (d) and the extrusion speed change target value and the push output change target value Based on time series data of speed estimate and push output estimate
If the maximum value of the extrusion rate estimated value exceeds a preset value, the heating temperature of the billet is lowered,
If the maximum value of the estimated push output value exceeds the value set in advance, the heating temperature of the billet is raised.
Billet heating control method. A program for performing hot extrusion processing on a billet at a predetermined extrusion speed and pushing force condition by a computer to estimate the internal temperature distribution in the longitudinal direction of the extruded product when producing an extruded product There,
On the computer
(A) setting a plurality of temperature distributions in the longitudinal direction of the extruded product;
(B) For each of the plurality of temperature distributions set in the step (a), a plurality of extrusions based on information including the temperature distribution and predetermined extrusion speed change target values and push output change target values. Calculating time-series data of a velocity estimate and a plurality of push output estimates;
(C) comparing the time series data of the plurality of extrusion speed estimated values and the plurality of push output estimated values obtained in the step (b) with the time series data of the extrusion speed actual value and the push output actual value Extracting one temperature distribution corresponding to the optimal time-series data of the extrusion speed estimate and the push output estimate;
(D) determining the one temperature distribution extracted in the step (c) as an internal temperature distribution in the longitudinal direction of the extruded product.
program. In the step (a), the setting of the plurality of temperature distributions is performed a plurality of times, and the setting of the temperature distribution after the second time is performed based on the one temperature distribution extracted by the extracting unit.
The program according to claim 9. In the step (a), setting of the temperature distribution after the second time is performed using a particle swarm optimization method.
The program according to claim 10. A program for controlling the billet heating temperature during hot extrusion processing by a computer,
On the computer
Steps (a) to (d) described in any of claims 9 to 11;
(E) changing the billet heating temperature;
In the step (e), the extrusion calculated using information including the temperature distribution of the extruded product determined in the step (d) and the extrusion speed change target value and the push output change target value Based on time series data of speed estimate and push output estimate
If the maximum value of the extrusion rate estimated value exceeds a preset value, the heating temperature of the billet is lowered,
If the maximum value of the estimated push output value exceeds the value set in advance, the heating temperature of the billet is raised.
program.

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