JP2000271634A - Control method of product temperature in extrusion quenching - Google Patents

Abstract

PROBLEM TO BE SOLVED: To stably uniformly obtain mechanical characteristics such as strength and surface quality required for a product over the extruding direction by measuring the temperature of an aluminum extruded product just before quenching with a non-contact type thermometer via the temperature measuring hole of an extruding tool and further measuring the temperature of the extruded product after quenching with a contact type thermometer in the downstream side of an extruding press. SOLUTION: A billet 3 is pushed by an extruding press 1 from the back side and is extruded into a product 2 through a die 24. The temperature of the extruded product before quenching is measured with a non-contact type thermometer 4 on a bolster 25 via a measuring hole 6, the measured value is sent to an extrusion speed controller 30 and a billet heating temperature controller 31, and the temperature of the extruded product before quenching is kept constant over the extruding direction boy adjusting an extruding speed and a billet heating temperature. Also, the temperature of the extruded product after quenching is measured with a contact type thermometer 10 in the downstream side of the extruding press, the measured vague is sent to a cooling speed controller 32 together with the temperature of the extruded product before quenching, a cooling speed is controlled by adjusting the quantity of cooling water and pressure or the like of a water cooling device 9 and whereby the temperature of the extruded product after quenching is kept constant over the extruding direction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a method for quenching aluminum or aluminum alloy (hereinafter simply referred to as "aluminum") on-line immediately after extrusion, in which mechanical properties such as strength required for the product and surface quality are stable. The present invention relates to a method for controlling the product temperature at the time of extrusion quenching, which can be obtained uniformly in the extrusion direction of the extruded product.

[0002]

2. Description of the Related Art When manufacturing aluminum products by extrusion,
In order to enhance the mechanical properties such as the strength of the product, the extruded product immediately after extrusion is placed online, such as in a platen, and
Forcibly quenching is performed by a coolant such as water or a mixture of water and air (mist). When the extrusion quenching is performed, it is an important issue that mechanical properties such as strength of the extruded product and surface quality can be stably and uniformly obtained in the extrusion direction.

By the way, in order to secure the required quenching strength of the product by extrusion quenching and to obtain an aluminum extruded product having uniform mechanical properties such as strength in the extrusion direction, the following conditions must be satisfied. is there. Maintain the extruded product temperature before extrusion quenching (immediately after extrusion) to a temperature equal to or higher than the solutionizing temperature in order to secure the required quenching strength. Maintaining a constant overall temperature of the extruded product before the extrusion quenching (immediately after the extrusion) in order to obtain an extruded product having uniform mechanical properties such as strength in the extrusion direction. In order to secure the required quenching strength and to keep the product surface temperature constant, the cooling rate during rapid cooling should be above a certain value.
And to reduce fluctuations.

However, in actual extrusion, the temperature of the extruded product before the quenching of the extrusion varies depending on conditions such as the components and shape of the extruded material and the extrusion conditions. Even if the temperature of the extruded product before extrusion quenching is constant, the actual cooling conditions during quenching also have variations in the cooling rate, etc., which also affect the mechanical properties and surface quality of the extruded product in the extrusion direction. Come.

[0005] Therefore, in order to make the mechanical properties and surface quality of the extruded product after quenching uniform based on the variation of the extrusion conditions, when quenching the product online immediately after extrusion, first, before quenching, It is absolutely necessary to continuously and accurately measure the temperature of the extruded product after quenching. Then, based on the measurement results, the extrusion speed and / or the billet heating temperature are adjusted to maintain the extruded product temperature before quenching at or above the solution heat temperature, while adjusting the cooling rate and quenching. It is necessary to secure the strength and keep the temperature of the extruded product after quenching constant in the extrusion direction.

Conventionally, it has been known that when extruding and quenching aluminum, the temperature of the extruded product before and after the quenching is continuously measured. For example, JP-A-6-2777
As disclosed in Japanese Patent No. 47, when the extrusion quenching is performed, thermometers for measuring the temperature of the extruded product are provided at the entrance of the quenching device at the exit of the extruder and at the exit of the quenching device, respectively. Accordingly, it has been proposed to adjust the injection amount and the injection timing of the refrigerant in each cooling zone of the quenching device in order to match a preset target cooling rate pattern.

However, when actually trying to measure the temperature of an aluminum product during quenching of extrusion, there are many problems to be considered (described later). In this publication, there is no specific method for measuring the temperature of the extruded product, nor any specific description of the type or structure of the thermometer.

On the other hand, various concrete means for measuring the product temperature during aluminum extrusion without quenching the aluminum extrusion have been proposed in the past. The product temperature during aluminum extrusion is measured because the mechanical properties and surface quality of the product at the time of aluminum extrusion are closely related to the temperature of the aluminum product. In order to prevent the occurrence of surface defects, the product temperature after extrusion is continuously measured with a non-contact type thermometer to keep the product temperature below the temperature at which no surface defects occur and to improve productivity. Various methods have been proposed.

[0009] Among them, a typical one is disclosed in JP-A-3-15.
1116, JP-A-3-128116, JP-A-61-1
No. 19324 or JP-A-4-89128, and FIG. 8 shows an outline of these techniques. As shown in FIG. 8, in the extrusion press 1, the billet 3 in the container 20 is pushed from behind by a stem 21 and is extruded into a product 2 through a die supported by a platen 22. , A non-contact thermometer 4 ′ is provided on the back or rear of the platen 22.

The extruded product 2 on the exit side of the die 24
Non-contact type thermometer such as infrared radiation thermometer 4 '
The extrusion speed of the extrusion press and the billet heating temperature are controlled so that the measured product temperature is, for example, equal to or lower than the surface defect limit temperature set in advance.

[0011]

However, first, all of these prior arts are directed to a normal extrusion process,
The present invention is not directed to an extrusion quenching technique for forcibly quenching an aluminum product immediately after extrusion with a refrigerant such as water online as in the present invention. Therefore, no consideration is given to a problem (described later) to be considered when controlling the temperature of the product during the rapid cooling of the extrusion, and the method cannot be applied to the rapid cooling of the extrusion.

For example, as shown in FIG. 8, when a water cooling device (shower) 23 is provided on the exit side of the die 4 and the extruded product 2 is water-cooled after extrusion, since water vapor enters the temperature measurement region of the product, the platen 22 It is virtually impossible to measure the temperature of the extruded product with a non-contact thermometer from the back to the back of the car. In addition, the extruded product after water cooling has a relatively low temperature, especially when measuring a low emissivity metal material such as aluminum, a radiation thermometer tends to cause an error in temperature measurement at this low temperature side. .

Furthermore, based on such inaccurate data,
If the billet heating temperature, extrusion rate, or cooling rate is controlled, none of the three necessary conditions of the extrusion quenching can be satisfied, the required quenching strength is secured, and mechanical properties such as strength are uniform throughout the extrusion direction. No extruded product can be obtained. In addition, there may occur a problem that the surface defects of the extruded product are frequently generated and the productivity of the press is extremely reduced.

Accordingly, the present invention overcomes these problems of the prior art, and when aluminum is rapidly quenched online immediately after extrusion, the mechanical properties such as the strength required for the product and the surface quality are stable and the extrusion is difficult. It is an object of the present invention to provide a method for controlling a product temperature at the time of extrusion quenching, which can be uniformly obtained in a product extrusion direction.

[0015]

Means of the present invention for this purpose are as follows. When quenching an aluminum or aluminum alloy product immediately after extrusion, the temperature of the extruded product before and after quenching is measured, and based on the measurement results. A method for controlling the temperature of the extruded product before quenching to be equal to or higher than the solution temperature and maintaining the temperature of the extruded product after quenching constant in the extrusion direction. The temperature of the extruded product after quenching is measured by a contact-type thermometer provided on the downstream side of the extrusion press through a non-contact thermometer through the provided temperature measurement hole.

In the present invention, based on this temperature measurement result,
In order to maintain the extruded product temperature before quenching at or above the solution temperature, it is preferable to adjust the extrusion speed and / or the billet heating temperature.

Further, in order to keep the temperature of the extruded product after quenching constant in the extrusion direction, it is preferable to adjust the cooling rate during quenching.

Further, in order to improve the temperature measurement accuracy, in the present invention, the extruded product temperature before quenching is predicted from at least measured values of billet heating temperature, die heating temperature, extrusion speed, and extrusion load at the time of extrusion. It is preferable that the value measured by the non-contact type thermometer is corrected by the temperature.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First, an example in which the method for controlling the product temperature during quenching of extrusion according to the present invention is applied to an extrusion press will be described with reference to FIG. FIG. 1 shows an extrusion press and the temperature control method of the present invention,
FIG. 3 is an explanatory diagram showing a relationship with a method of measuring a product temperature.
In the extrusion press 1 of the figure, the billet 3 in the container 20 is pushed from behind by the stem 21 and the platen 2
It is extruded into the product 2 through a die 24 supported by a bolster 2 or a bolster 25 or the like.

In this embodiment, the temperature of the extruded product before quenching is
The temperature of the extruded product after quenching is measured by a contact-type thermometer 10 provided on the downstream side of the extrusion press, and is measured by a non-contact type thermometer 4 provided on a bolster 25 of the extrusion tool.

The temperature of the extruded product before quenching measured by the non-contact type thermometer 4 is sent as information to the extrusion speed control device 30 and the billet heating temperature control device 31. Adjust the temperature to keep the extruded product temperature before quenching above the solution heat-up temperature.

The extruded product temperature after quenching measured by the contact thermometer 10 is sent to the cooling speed control device 32 together with the extruded product temperature before quenching as information. The cooling rate is controlled by adjusting the cooling water amount, pressure, and the like of the apparatus 9, and the temperature of the extruded product after quenching is kept constant in the extrusion direction.

Next, the measurement of the temperature of the extruded product before quenching will be described in detail. As shown in FIG. 1, before the quenching, the measurement area of the extruded product temperature is surrounded by an extrusion tool such as a die 24, a bolster 25, a platen 22, and a water cooling device 30 and cannot be directly viewed from the outside. It is. For this reason, when trying to provide a non-contact type thermometer, it is inevitable to provide a hole for temperature measurement in the tools and measure the product temperature from this temperature measurement hole. The following issues arise.

The temperature of the thermometer exceeds the service limit due to the effect of a hot tool such as a bolster. Specifically, when extruding an aluminum alloy, the temperature of the tool is 300 ° C.
On the other hand, the usable temperature range of the thermometer is usually 150 ° C. or less. Water vapor generated during water cooling enters the temperature measuring hole, changes the apparent emissivity of the product, and adversely affects measurement accuracy. Since tools such as bolsters are frequently changed, it is necessary to devise ways to attach and detach the thermometer.

To solve these problems, an embodiment of the present invention for measuring the temperature of the extruded product before quenching is as follows. As shown in FIGS. 1 and 2, the non-contact thermometer 4 is provided by a holder 5 at an upper end of a temperature measurement hole 6 provided in an extrusion tool such as a bolster 25. In order to solve the above problems, the holder 5 is connected to the bolster 25 via the heat insulating material 8b.
In addition, the thermometer 4 is also detachably fitted.
Through a, it is detachably fitted into the holder 5, so as not to be affected by the heat of a hot tool such as a bolster. The place where the non-contact thermometer is installed is
Not only the inside of the bolster of this example but also an appropriate place in the extrusion tool can be selected according to the tool structure.

In order to solve the above-mentioned problem, an air pipe 7 is provided in the middle of the holder 5 toward the temperature measurement hole 6, and air is supplied from the air pipe 7 to the temperature measurement hole 6. Is supplied, and steam generated by water cooling of the product is supplied to the temperature measurement hole 6.
Is not allowed to enter from below. This air is
The inside of the temperature measurement hole 6 is cooled to ensure the temperature measurement of the extruded product 2 by the thermometer 4. Note that a gas such as an inert gas may be used instead of air. With this configuration, the temperature of the extruded product is measured by a non-contact type thermometer from the back to the back of the platen 22. As in the above-described conventional technology, steam enters the product temperature measurement area, and the extruded product temperature is reduced. The situation in which measurement of the data becomes impossible is prevented. In addition, in the case of quenching with a refrigerant other than water, such as an inert gas, for cooling the extruded product, since there is no problem of the water vapor in the case of water, the purpose is to cool the temperature measurement holes and jigs. Other than
This piping becomes unnecessary.

Any kind of non-contact type thermometer can be used as long as it is a so-called non-contact type thermometer such as an infrared radiation thermometer. In the case of general extrusion, the emissivity of the surface of the extruded product changes depending on the type and shape of the extruded material, and it is difficult to change the emissivity of the non-contact type thermometer one by one according to these conditions. Therefore, with a non-contact thermometer,
It is difficult to accurately measure the temperature of each rod of the extruded material. But,
In the case of extrusion quenching as in the present invention, the range of the type and shape of the target extruded alloy, the extrusion speed and the temperature are within a certain range, so that the emissivity does not change significantly, and the emissivity does not change. Accurate temperature measurement is possible even with a contact-type thermometer.

The present inventors have found that even with a non-contact type thermometer, there is little variation in the relative change amount of the extruded product temperature. Further, the non-contact type thermometer has an advantage that it is possible to continuously measure the temperature in the extrusion direction (product longitudinal direction) of the extruded product, which is important for the present invention.

FIG. 7 shows an example of measurement of the extruded product temperature before quenching by a non-contact type thermometer. FIG. 7 shows aluminum A6061
When the alloy was extruded under normal extrusion conditions, the product temperature immediately after extrusion was measured with a non-contact thermometer (infrared radiation thermometer) shown in FIGS. It is the chart figure which verified. The extrusion conditions were as follows: a 150 mmφ billet was melted by a DC casting method, and then subjected to a homogenizing heat treatment at 470 ° C. × 8 hours.
At 2 m / min, a flat plate having a thickness of 2 mm and a width of 100 mm was extruded.
From the figure, the measurement result A of the non-contact type thermometer according to the present invention is shown.
Can be measured with a precision of ± 10 ° C., which is almost the same as the measurement result B of the contact-type thermometer, with respect to the target solution temperature C.

Next, measurement of the temperature of the extruded product after quenching will be described in detail. As described in the section of the prior art, it is difficult to accurately measure the temperature of an extruded product after quenching with a non-contact thermometer. In addition, the prediction of the extruded product temperature from other extrusion conditions also shows that the product after quenching contains factors for the cooling process,
In addition, it is difficult because of a rapid temperature change during the cooling process.
Therefore, inevitably, the measurement must be performed by a contact-type thermometer. In this case, it is essential that the product is not damaged, and for this purpose, it is necessary to follow the extrusion speed of the product. It is necessary for the thermometer itself to move.

An embodiment of measurement of the temperature of the extruded product after quenching for these problems will be described. As shown in FIGS. 1 and 3, the contact thermometer 10 is located downstream of the extrusion press, that is,
It is placed on a moving rail 15 provided on the back of the platen 22 via a vertical moving device 13 and a horizontal (extrusion) moving device 14. Contact type thermometer 10
Product protective material (soft material) 12 to prevent scratches on the product
And a thermocouple 16 for measuring the temperature of the extruded product 2 cooled (quenched) by the water cooling device (shower) 30 (the temperature immediately after rapid cooling). As the product protection material 12, a soft material such as rubber, plastic, cloth, non-woven fabric or the like, which is lower than the hardness of the extruded product, is appropriately selected and used.

4a to 4e show the operation of measuring the temperature of the contact thermometer 10 (the temperature immediately after rapid cooling). 4A shows a standby state of the contact thermometer 10, and FIG. 4B shows a start state of the temperature measurement. The temperature sensor 10 (thermocouple 1) is detected while the pressure sensor 11 detects the contact state and the contact pressure with the product.
6) is brought into contact with the product. FIG. 4C shows a state in which the thermometer 10 is moving in the extrusion direction according to the extrusion speed while being in contact with the product. This moving time is about 5 seconds, depending on the extrusion conditions. FIG. 4D shows a state where the temperature measurement has been completed and the thermometer 10 (thermocouple 16) has been separated from the product.
FIG. 4e shows a state where the thermometer 10 (thermocouple 16) is returned to the standby state position of FIG. 4a. During the temperature measurement, the operations in FIGS. 4A to 4E are repeated to measure the temperature distribution in the extrusion direction (longitudinal direction) of the extruded product. Note that, although this embodiment is not a complete continuous measurement of temperature, the product temperature during extrusion does not change so drastically,
Even if there is a temperature measurement interval of about 10 seconds, there is no problem assuming that the measurement is almost continuous.

Further, with respect to the measurement of the temperature of the extruded product before the quenching, a method of measuring the temperature of the extruded product before the quenching will be described. As described above, in the case of extrusion quenching as in the present invention,
Compared to general extrusion, the type and shape of the target extruded alloy, extrusion speed and temperature range fall within a relatively narrow range, so the emissivity does not greatly change, and is represented by the radiation type Even non-contact type thermometers can accurately measure temperature. On the contrary, when the extrusion conditions are greatly changed, the measurement accuracy is affected as in the case of general extrusion, and the measurement accuracy needs to be further increased depending on the extruded product. Therefore, it is desirable to combine the temperature measurement of a non-contact thermometer with the prediction of the temperature of the extruded product before quenching in order to address these issues.

The temperature of the extruded product before quenching is estimated from the values of other extrusion conditions which cannot be measured continuously as in a non-contact type thermometer, although the temperature of the extruded product cannot be measured continuously. As with a non-contact type thermometer, the product temperature can be accurately predicted. Extrusion conditions that can be measured accurately include at least billet heating temperature, die heating temperature during extrusion,
The actual values of the extrusion speed and the extrusion load are selected.

The method of estimating the temperature of the extruded product before quenching will be described in detail with reference to FIG. In FIG. 5, the means for predicting the product temperature includes a temperature measuring device 35 for measuring the temperature of the billet 3 unloaded from the billet heating device 41 and the temperature of the dice 24 unloaded from the die heating device 42. Detectors 36 and 37 for measuring the extrusion load and extrusion speed during extrusion and a product temperature estimating device 38a for estimating the product temperature at the die outlet from the measured temperature, load and speed. The apparatus further includes an extrusion condition determining device 38b that compares the predicted product temperature with the set product temperature and determines optimum conditions of the billet heating temperature and the extrusion speed. Further, a billet heating temperature controller 40 for adjusting the billet heating temperature and the extrusion speed based on this determination information.
And an extrusion speed controller 39. The product temperature prediction device 38a and the extrusion condition determination device 38b are each formed by a microcomputer.

In the product temperature prediction device 8a, the product temperature θs immediately after extrusion is predicted. The formula used for the prediction of the product temperature θs is based on the prediction formula obtained from the balance formula of the amount of heat during extrusion, since the calculation time is short and the practicality in actual production is excellent (of course, the prediction accuracy is also good). Is preferred. At this time, among the various extrusion conditions, the actual measured values of the billet heating temperature θb, the die heating temperature θd, the extrusion speed V, and the extrusion load F during the extrusion are the minimum measured values necessary for prediction. For other extrusion conditions such as the extrusion ratio and the billet cross-sectional area used for predicting the product temperature, preset values can be used. If the measured values alone do not provide sufficient accuracy in predicting the product temperature, it is necessary to consider the billet temperature change during extrusion, and it is necessary to incorporate the effect of the container temperature into the equation. Become.

Based on the balance formula of the amount of heat during the extrusion,
Among the extrusion conditions, billet heating temperature θb during extrusion,
A prediction formula using values that can be accurately measured, such as the die heating temperature θd, the extrusion speed V, and the extrusion load F, is shown below. Prediction formula 1: θs = １ ／ (θb + θd) + (Fs · St
· J ^-1 ) / [C · ρ · V + (hdb · Sb · Δt) / 2] where θs: product temperature (° C), θb: billet heating temperature (° C), θd: die heating temperature (° C), Fs: End load of extrusion (kgf), St: Extrusion stroke (m), J: Work equivalent of heat [kgfm / kcal], C: Specific heat of extruded product [kcal / (kg · ° C)], ρ: Extrusion Product density [kg / (m ³ )], V: volume of extruded product (m ³ ), h
db: heat transfer rate from billet to tool [kcal / (m
² · min · ° C.)], Sb: billet cross-sectional area (m ² ),
Δt: extrusion time (s),

Here, V and Δt in the prediction equation 1 are expressed as follows:
St · Sb, Δt = (R · St) / v, where v: extrusion speed (m / s), R: extrusion ratio,
The above equation can be expressed as prediction equation 2 as follows. Prediction formula 2: θs = １ ／ (θb + θd) + (Fs ·
J ^-1 ) / [C · ρ · Sb + (hdb · Sb · R) / 2v]

FIG. 6 shows the result of confirming the accuracy of the product temperature by the prediction formula 2. FIG. 6 is an explanatory diagram comparing a product temperature predicted value based on Prediction Equation 2 with an actual measured product temperature using a contact-type or non-contact-type thermometer. In FIG. 6, the horizontal axis represents the speed increase width from the reference extrusion speed, and the vertical axis represents the temperature difference from the limit product temperature (limit setting temperature at which no extrusion defects occur) θmax. As is clear from FIG. 6, in the case of the product 1, the actual measured value of the product temperature using the contact thermometer of the white circle and the predicted product temperature by the prediction formula 1 of the present invention of the black circle are within ± 10 ° C. Match with precision. On the other hand, when using a non-contact type thermometer, the vibration width of the measured value is large, probably due to the influence of the metal surface gloss,
Since the measured value could not be specified, it is not plotted in FIG.

Further, in the case of the product 2, the billet temperature is lowered by about 20 ° C. when the increase in the speed on the horizontal axis is about 4.2, and the product temperature predicted value by the prediction formula 1 of the present invention of the black circle is ,
This corresponds to this temperature drop, and is in agreement with the actual measured value of the product temperature using a white circle contact-type thermometer with an accuracy within ± 10 ° C. On the other hand, when a non-contact thermometer with a black square is used, it cannot cope with the temperature drop, and a higher temperature is shown as a measurement result. From these results, it can be seen that the product temperature predicted value according to the prediction formula 1 of the present invention is in good agreement with the actual measured product temperature using a contact-type thermometer, and the prediction accuracy is high.

The measurement of the product temperature during extrusion by a non-contact type thermometer shows that although the relative change in the temperature of the extruded product has little variation, the absolute value of the actual product temperature may vary. When the measurement accuracy of the absolute value of the product temperature is to be improved, the continuous temperature measurement value of the extruded product by the non-contact type thermometer is corrected using the predicted product temperature value.

For example, the average value of the result of continuously measuring the temperature of the extruded product by the first non-contact type thermometer of the extruded billet is 560 ° C., and the temperature of the extruded product is estimated using the product temperature estimation formula. When the value is 520 ° C., from the second extruded billet, the temperature obtained by subtracting 40 ° C. from the continuous temperature measured by a non-contact type thermometer is treated as the product temperature.

[0043]

As described above, according to the temperature control method of the present invention, when quenching a metal online immediately after extrusion, the productivity and the mechanical properties such as the strength required for the product and the surface are not reduced. The quality is obtained stably and uniformly over the extrusion direction of the extruded product. In addition, this effect can be used to significantly change the manufacturing process of conventional aluminum extruded products,
The industrial value is great in that it can be achieved without increasing the manufacturing cost.

[Brief description of the drawings]

FIG. 1 shows an embodiment of the present invention and is an explanatory diagram of a relationship between an extrusion press and a thermometer.

FIG. 2 shows an embodiment of the present invention and is an explanatory diagram of a non-contact type thermometer.

FIG. 3 shows an embodiment of the present invention and is an explanatory view of a contact thermometer.

4 (a) to 4 (e) show an embodiment of the present invention and are explanatory diagrams of the operation of a contact thermometer.

FIG. 5 shows an embodiment of the present invention, and is an explanatory diagram of a relationship between an extrusion press and a product temperature predicting device.

FIG. 6 is an explanatory diagram showing an embodiment of the present invention and showing a comparison between a predicted temperature value and an actually measured value.

FIG. 7 is an explanatory view showing an embodiment of the present invention and showing the measurement accuracy of the product temperature of the non-contact type thermometer.

FIG. 8 is an explanatory view showing a conventional technique and showing a relationship between an extrusion press and a non-contact type thermometer.

[Explanation of symbols]

1; extrusion press; 2; extruded product; 3; billet; 4; non-contact thermometer; 5; thermometer holder, 6; measuring hole, 7; air supply piping, 8a, 8b; Device, 1
0; contact thermometer, 11; pressure sensor, 12; product protection material, 13; vertical movement device, 14; extrusion (horizontal) movement device, 15; contact thermometer movement rail, 16;
Thermocouple, 20; container, 21; stem, 22; platen, 24; die, 25; bolster, 36; extrusion load detector, 37; extrusion speed detector, 38a; product temperature prediction device, 38b; 39, extrusion speed controller, 40; billet heating temperature controller, 41; billet heating device, 42; die heating device,

Claims (5)

[Claims] When an aluminum or aluminum alloy product is quenched immediately after extrusion, the temperature of the extruded product before and after quenching is measured, and the temperature of the extruded product before quenching is set to a temperature equal to or higher than the solution temperature based on the measurement results. A product temperature control method for keeping the temperature of the extruded product after quenching constant in the extrusion direction while maintaining the temperature of the extruded product before quenching through a temperature measurement hole provided in the extrusion tool. A method for controlling a product temperature during rapid cooling of an extrusion, wherein the temperature of the extruded product after quenching is measured by a thermometer, and the temperature of the extruded product after quenching is further measured by a contact-type thermometer provided downstream of the extrusion press. 2. The method according to claim 1, wherein the temperature of the extruded product before quenching is maintained at a temperature equal to or higher than the solution temperature by adjusting the extrusion speed and / or the heating temperature of the billet. 3. By adjusting the quenching cooling rate,
3. The method for controlling a product temperature during extrusion quenching according to claim 1 or 2, wherein the temperature of the extruded product after quenching is kept constant in the extrusion direction. 4. The method according to claim 1, wherein a gas is passed through the temperature measuring hole. 5. The extruded product temperature before the quenching is at least the billet heating temperature, the die heating temperature, the extrusion speed,
5. The method according to claim 1, wherein the temperature is predicted from an actually measured value of the extrusion load, and the value measured by the non-contact type thermometer is corrected based on the predicted temperature.
The method for controlling a product temperature during extrusion quenching according to any one of the above items.