JP3310181B2 - Extrusion control method and extrusion control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an extrusion control method and a control apparatus capable of pursuing a maximum extrusion speed without causing surface defects when extruding a metal.

[0002]

2. Description of the Related Art Generally, in a metal extrusion process, as shown in FIG.
And is extruded as a product 2 through a die 4.

In the production of this extruded product, it is desired to increase the extrusion speed in terms of production efficiency. However, on the other hand, cracking (tearing, crack),
There is a problem that surface defects such as pick-up are likely to occur. Therefore, to speed up extrusion,
Measures to prevent surface defects are indispensable.

[0004] It is known that the above-mentioned surface defects of an extruded product are remarkably generated when the temperature of the extruded product reaches a certain limit temperature (solidus temperature or the like). For this reason, one of the measures for preventing the occurrence of surface defects is to prevent the temperature of the extruded product from reaching the limit temperature.

[0005] From this viewpoint, in order to prevent the occurrence of surface defects in extruded products and to improve the extrusion speed, an extrusion control method as described in, for example, Japanese Patent Application Laid-Open No. 61-119324 has been conventionally used. Has been proposed. In this prior art, as shown in FIG. 8, the temperature of the product 2 at the exit side of the die 4 is continuously measured by an infrared thermometer (non-contact thermometer) 30 provided at the exit side of the platen 22. In this method, the extrusion speed is constantly controlled and the billet temperature at the next extrusion is controlled so that the measured product temperature is equal to or lower than the surface defect occurrence limit temperature set in advance.

[0006]

However, when the present inventors measured the temperature of the extruded product using the infrared thermometer shown in the above-mentioned prior art, errors or variations in the following measured values may occur. I found that there is. The emissivity of the product surface changes due to changes in the surface roughness, shape complexity, alloy type, etc. of the metal product, and the measurement accuracy of the infrared radiation thermometer fluctuates by about ± 20 ° C accordingly. . For example, when the surface roughness is large (for example, when a surface defect is generated), the product temperature tends to be higher by + 20 ° C. than when the surface roughness is small (for example, when the surface is good). It is susceptible to disturbances such as high-temperature objects such as graphite blocks provided at the exit of the platen of the extruder and lighting or sunlight.
° C). As shown in FIG. 9, a water cooling device (shower) 23 is provided on the exit side of the die 4, and when the extruded product 2 is directly water-cooled after extrusion (difference from FIG. It is difficult to measure the temperature of the extruded product due to the influence of water smoke or water vapor caused by the cooling water.

Therefore, when controlling the billet heating temperature and the extrusion speed using a conventional infrared thermometer,
If an error or variation occurs in the measured values, the following problems may occur. That is, if the temperature of the extruded product is set (measured) lower than the actual temperature, the extrusion speed is set to an optimum value or more, and there is a possibility that surface defects occur frequently. Also, if the extruded product temperature is set (measured) higher than the actual temperature,
Extrusion speed will be set below the optimal value, and extrusion productivity may be reduced.

[0008] For this reason, in order to pursue the maximum temperature without generating surface defects, it is necessary to measure the temperature of the extruded product with high accuracy. As one of means for measuring the temperature of the extruded product with high accuracy, there is a method using a contact thermometer such as a thermocouple. However, due to the structure of the extrusion press, it is difficult to secure a space for installing the contact thermometer on the die exit side. Even if space is secured, contact-type thermometers should be installed for products of various shapes extruded at high speed so that they can be used online without damaging the products and without damaging the thermometer itself. It is difficult.

Therefore, first, the first object of the present invention is to achieve high productivity (extrusion speed) for controlling the billet heating temperature and extrusion speed without generating surface defects with high precision. It is to provide a method for predicting the extruded product temperature.

[0010] In addition, the above-mentioned prior art has a problem in controlling an extrusion condition (a billet heating temperature and an extrusion speed) in addition to an error or variation in the measured value of the extruded product temperature in order to increase the extrusion speed. There is.

In order to produce a good product by extrusion, the extrusion conditions (billet temperature and extrusion speed) are limited by two types of limit curves, ie, a surface defect generation limit and a press capability limit, as shown in FIG. B should be determined. In other words, in the region A, the extrusion load is equal to or higher than the pressing capability limit, and extrusion cannot be performed. In the region C, the product temperature is equal to or higher than the surface defect occurrence limit temperature, and a good product cannot be obtained. . Therefore, in order to produce a good product at the highest extrusion speed, it is necessary to control both the extrusion speed and the billet heating temperature so as to be in the region of Z in FIG.

On the other hand, in the above prior art, the billet heating temperature and the extrusion speed are controlled in consideration of only the fact that the actual extruded product temperature is equal to or lower than the set surface defect occurrence limit temperature, and the extrusion speed is increased. want to be. That is, the prior art does not consider the press capability limit of FIG.

For this reason, according to the above prior art, if the billet temperature is steadily lowered, it is possible to achieve the maximum extrusion speed without exceeding the surface defect generation limit temperature.
However, in reality, the lower the billet temperature, the larger the load required for extrusion, and if the extrusion load exceeds the capability of the press, clogging occurs and the extrusion itself becomes impossible. is there.

Accordingly, a second object of the present invention is to provide a method for accurately predicting the temperature of an extruded product by using a method for accurately predicting the temperature of an extruded product. It is an object of the present invention to provide an extrusion control method capable of obtaining the properties (extrusion speed).

[0015]

Means for Solving the Problems First, the present inventors have developed a method for accurately predicting the temperature of an extruded product, which can be accurately measured during normal extrusion production. It is better to predict the temperature of the extruded product than the infrared radiation thermometer
It was found that the dispersion was small and the accuracy was improved.

Further, the method for predicting the temperature of the extruded product by using the high-precision predicted value for a method of achieving the highest extrusion speed achievable with the press for any press can be used. Based on the values, in addition to the product temperature (surface defect occurrence limit temperature), it was found that it was necessary to control the extrusion conditions (billet heating temperature, extrusion speed) by considering the press capacity limit = extrusion load limit as a control index. .
In other words, it has been found that if the extrusion load limit is used as a control index in addition to the product temperature, the highest extrusion speed can be obtained in the extrudable region of the press.

The gist of the extrusion control method of the present invention based on such knowledge is as follows. First, among the extrusion conditions, at least the extruded product temperature is determined from the actual measured values of billet heating temperature, die heating temperature, extrusion speed, and extrusion load during extrusion. Heat generated by processing
Assumed to be affected only by heat transfer to die
Predict the product temperature immediately after extrusion from the balance formula of the amount of heat during extrusion, and then, based on this highly accurate predicted value, determine the extrusion speed so that extrusion production is possible (below the load limit) and the product surface The billet temperature is controlled so as to have the highest speed within a range in which no defect is generated (a range below the surface defect generation limit temperature of the product), that is, a range in which a good product can be produced.

In a preferred embodiment of the product temperature prediction, the product temperature immediately after extrusion is calculated by comparing the heat amount during extrusion described later.
That is to predict from the lance formula.

In a preferred embodiment of the control method, as shown in FIG. 4 (b) described later, the load limit of the extrusion press and the surface defect generation limit temperature for the extrusion speed and billet temperature are set in advance, The predicted temperature value and the measured extrusion load value are respectively within the limit of surface defect occurrence temperature and within the load limit of the extrusion press, that is, it is determined whether or not further extrusion speed improvement is possible. When it is determined that the extrusion speed can be improved, the extrusion speed is set to the highest speed within the load limit of the extrusion press and within the temperature range below the surface defect occurrence limit temperature of the product (see FIG. 4B). Controlling the billet temperature (to enter the region).

Further, for carrying out the method of the present invention,
The gist of the preferred extrusion control device is a device for measuring the temperature of a heated billet, a device for measuring the temperature of a heated die, a device for measuring an extrusion load, a device for measuring an extrusion speed, and these devices. Measured temperature, extrusion load,
A device that predicts the product temperature at the exit of the die from the extrusion speed information, based on the comparison result between the predicted product temperature value and the set surface defect occurrence limit temperature and the comparison result between the actual measured extrusion load value and the set load limit value An extrusion condition determining device for determining a billet temperature so that the extrusion speed is set to a maximum speed within a range of an extrusion load limit and a range in which a surface defect of the product does not occur (a range below a surface defect generation limit temperature of the product). And a controller for controlling the billet heating temperature and the extrusion speed based on the decision information.

[0021]

DESCRIPTION OF THE PREFERRED EMBODIMENTS First, an example in which the extrusion control method of the present invention is applied to an extrusion press will be described with reference to FIG. FIG.
FIG. 2 is an explanatory diagram of an extrusion press and an apparatus used for a control method of the present invention. In the figure, the basic structure of the extrusion press 1 is the same as that of FIG. The control device of the present invention comprises a temperature measuring device 5 for measuring the temperature of the billet 3 carried out from the billet heating device 11 and the temperature of the die 4 carried out from the die heating device 12; It has detectors 6 and 7 for measuring the speed, and a product temperature estimating device 8a for estimating the product temperature at the die exit from the measured temperature, load and speed.

The predicted product temperature is compared with a set surface defect occurrence limit temperature (hereinafter, simply referred to as a limit temperature), and an extrusion load is compared with a set load limit of an extrusion press. An extruding condition determining device 8b is provided for determining the billet temperature to be the highest within the range of the extrusion load limit and not more than the surface defect generation limit temperature of the product. Further, a billet heating temperature controller 10 and an extrusion speed controller 9 for adjusting the billet heating temperature and the extrusion speed based on the determination information are provided. The product temperature prediction device 8a and the extrusion condition determination device 8b are each formed by a microcomputer.

In the product temperature prediction device 8a, the product temperature θs immediately after extrusion is predicted, and a method of this prediction will be described. The prediction of the product temperature θs is short in calculation time and excellent in practical use in actual production (of course, the prediction accuracy is also good)
Therefore, it is preferable to carry out the calculation according to a prediction formula obtained from a balance formula of the amount of heat during extrusion.

The inventors of the present invention have examined the heat balance equation. As a result, it is considered that the extruded product temperature is affected by only two items, namely, heat generated by processing and transfer of heat to the die. Can be formulated using actual measured values (billet heating temperature, die heating temperature, extrusion speed, extrusion load) and required extrusion conditions (extrusion ratio, billet cross-sectional area) generally measured during extrusion production. It was found that the temperature can be predicted easily, in a short time and with good accuracy. The specific extruded product temperature prediction is shown below.

Prediction formula: θs = θb + Δθ ₁ − [(H ·
R) / ( C.ρ.Sb.v )] × (θb + Δθ ₁ / 2-
θd), where θs: product temperature (° C.), θb: billet heating temperature (° C.), Δθ ₁ = (Fs · J ⁻¹ ) / (C · ρ ·
Sb), H: heat transfer rate from the extruded material to the tool [kca
1 / (min · ° C.)], R: extrusion ratio, C: specific heat of extruded product [kcal / (kg · ° C.)], ρ: density of extruded product [kg / (m ³ )], Sb: cross section of billet (M ² ),
v: extrusion speed (m / min), θd: die heating temperature (° C.), Fs: extrusion final load (kgf), J: work equivalent of heat [kgfm · k / kcal] The specific heat of the extruded product in the formula , Density and work equivalent of heat are material property values and physical constants, and can be treated as constants.

First, the results of confirming the accuracy of the extruded product temperature prediction formula for products of various shapes are shown in FIG.
FIG. 2 shows the product temperature rise (product temperature−
Billet temperature) (vertical axis) and contact type (thermocouple)
FIG. 5 is an explanatory diagram showing a relationship between a product temperature rise (product temperature-billet temperature) measured value (horizontal axis) using the thermometer of FIG.
The circles and black circles in the figure indicate hollow extrusion products (extrusion ratio:
20 to 75) and a solid extruded product (extrusion ratio: 20 to 40). As is clear from FIG. 3, the measured value of the product temperature and the predicted value of the product temperature by the prediction formula 4 are in good agreement within ± 10 ° C. for the hollow and solid extruded products.

Next, an example of the result of comparing the accuracy of the extruded product temperature prediction formula with the measured product temperature by a contact thermometer (thermocouple) when the extrusion conditions (extrusion temperature and billet temperature) are changed. Is shown in FIG. In FIG. 3, the horizontal axis is
The width of increase in speed from the reference extrusion speed is taken, and the vertical axis shows the temperature difference from the limit temperature θmax of the product temperature. In the case of product 1, the relationship between the rise in extrusion speed and the rise in product temperature determined by the prediction formula of the present invention (black circle in the figure)
Is the actual measured value of the product temperature using a contact-type thermometer
They match with accuracy within ± 10 ° C. Similarly, in the case of the product 2, the relationship between the increase in the extrusion speed and the increase in the product temperature obtained by the prediction formula of the present invention (△ in the figure) is the same as the measured value of the product temperature using the contact type thermometer of □, They match with accuracy within ± 10 ° C. The speed increase width of the horizontal axis is about 4.2 m / min. Since the billet temperature was lowered by about 20 ° C., the measured value of the contact thermometer indicated by □ was about 2.7 m / min. The product temperature prediction value according to the present invention indicated by △ also corresponds to the tendency of the product temperature to decrease.

From the results of FIGS. 2 and 3, the predicted product temperature by the prediction formula of the present invention is accurate even when the product shape and the extrusion conditions (extrusion temperature and billet temperature) are changed, and the maximum extrusion speed is obtained. It can be seen that it can be used as a control index for conversion.

Next, as a control factor of the present invention, a method of controlling the billet heating temperature and the extrusion speed in consideration of the pressing capacity limit = the extrusion load limit in addition to the limit temperature, and the method of controlling the billet heating temperature and the extrusion speed. The function of the extrusion condition determining device 8b for determining the optimum conditions will be described with reference to FIG. 4B and the flowcharts of FIGS. 5 and 6 (FIG. 6 is a flowchart following the mark * in FIG. 5).

FIG. 4 (b) is an explanatory diagram showing the relationship between the extrusion speed and the billet temperature similarly to FIG. 4 (a) and showing the concept of considering the limit temperature and the extrusion load limit of the present invention. is there. In the present invention, in FIG. 4B, the purpose is to extrude the product in a region where the extrusion speed can be maximized.

First, in step A of FIG. 5, based on required extrusion information (alloy type, extrusion ratio, billet size), restriction information (extrusion product limit temperature, press limit load, billet heating allowable range) and past actual data, The first extrusion condition (billet heating temperature and extrusion speed) is determined. In step B, extrusion is actually performed under the above conditions. At this time, billet heating temperature, die heating temperature, extrusion load,
A measurement of the extrusion speed is performed. In step C, the average value θs of the product temperature is predicted using the prediction formula 3 based on the measurement result.

In step D of FIGS. 5 and 6, the average value θs of the product temperature predicted by the above-mentioned prediction formula 3, the limit temperature θmax at which no surface defects occur, the extrusion load Fs during extrusion and the load of the extrusion press Each of the limits is compared with the limit Fmax, and it is determined to which of the areas in FIG. 4B the extrusion conditions currently belong. Next, based on this determination, in steps E and F, from the current area,
The billet heating temperature θb and the extrusion speed V are adjusted so as to enter the optimum region (corresponding to Z in FIG. 4A). In addition,
This adjustment operation is reflected on the billet heating temperature θb and the extrusion speed V set at the next extrusion.

If the current state belongs to the area shown in FIG. 4B, the current state or the next extrusion operation is performed under the same conditions because the area is within the optimum area. On the other hand, FIG.
It can be seen from the drawing that the product temperature has a margin, but the extrusion load has a limit when the temperature falls within the range of FIG. Therefore, if the billet heating temperature can be increased, the heating temperature is increased and the extrusion speed is set to be faster than the current state. However, depending on the relationship between the type of metal material and the temperature, another problem may occur, such as a burning defect on the surface during billet heating. If the billet heating temperature cannot be increased, the same setting is used. And

When the current state belongs to the region shown in FIG. 4B, the limit of the pushing load has a margin from the figure, but the product temperature is the limit. Therefore, if the billet heating temperature can be lowered, the heating temperature is lowered and the extrusion speed is set to be faster than the current state.

When the current state belongs to the region shown in FIG. 4B, the limit of the extrusion load and the limit of the product temperature are sufficient as shown in FIG. Therefore, since it is an area where it cannot be determined whether to increase or decrease the billet heating temperature, first, the extrusion speed is increased, and the billet heating temperature is adjusted after entering the or area shown in FIG. 4B.

When the current state belongs to the area shown in FIG. 4B, the extrusion load limit or the product temperature limit is exceeded, and extrusion cannot be performed. Aim to be within the extrudable area.

The adjustment of the extrusion conditions in each region is as described above, but the form of the adjustment formula and its coefficients are determined according to the situation.

[0038]

EXAMPLE A more specific example of the extrusion control method of the present invention will be described below. For the extrusion, an extrusion press shown in FIG. 1 was used, and the aluminum alloy used was 7N01 and the billet size was 160.
mmφ × 200 mml, extrusion ratio 48.4. In the extrusion of the first billet, based on past experience, the extrusion conditions were set as follows: billet heating temperature θb = θb0, extrusion speed V = V
Set to 0. The actual extrusion load value under this condition was the maximum extrusion load F = 0.8 × Fmax. However, Fmax
Is the critical load of the extrusion press. In addition, α, β,
gamma, for [delta] ₁ is, α = 10 ℃, β = 0.9, γ =
0.1, δ ₁ = about 5 ° C.

With the prediction formula of the present invention, the average value θs of the product temperature was predicted, and it was possible to predict that θs = θmax-8 ° C. Here, θmax is the limit temperature. From this result, it can be determined that the product temperature is in the region shown in FIG. 4B and that the extrusion speed should be further increased.

Based on the determination result, in the second extrusion, the extrusion speed V was changed so that the product temperature average value θs was within the range of or in FIG. 4B. The extrusion conditions were as follows: the billet heating temperature θb was the same θb0 as the first billet, and the extrusion speed V was increased to 1.1 V0. The actual measured value of the maximum extrusion load was F = 0.81 × Fmax, and the average value θs of the product temperature was predicted by the prediction formula. As a result, θs = θmax−6 ° C., and it was determined that it was still in the region of FIG. 4B.

From this result, in the third extrusion, the extrusion speed V was further increased, and the average product temperature value θs was calculated as shown in FIG.
Or in the area of Extrusion conditions are:
The billet heating temperature .theta.b was set to .theta.b0, the same as the first and second billets, and the extrusion speed V was further increased to 1.21V0. The actual measurement value of the maximum extrusion load was F = 0.81 × Fmax, and the average value θs of the product temperature was predicted by the prediction formula 1. As a result, θs = θmax−4 ° C., and FIG.
It was determined that the area of (b) was entered.

From the results, in the fourth extrusion, FIG.
The heating temperature of the billet was lowered and the extrusion speed V was further raised so as to be in the target optimum region of (b). The extrusion conditions were as follows: billet heating temperature θb was θb0-10 ° C., and extrusion speed V was further increased to 1.33 V0. The actual measured value of the maximum extrusion load was F = 0.87 × Fmax, and the prediction value 1 predicted the average value θs of the product temperature. As a result, θs = θmax−4 ° C., and it was determined that it was still in the region of FIG. 4B.

In the fifth extrusion, FIG.
, The billet heating temperature was further reduced, and the extrusion speed V was further increased. Extrusion conditions were as follows: billet heating temperature θb was θb0 −20 ° C., and extrusion speed V was further increased to 1.46 × V0. The actual measurement value of the maximum extrusion load is F = 0.93 × Fmax.
, The average value θs of the product temperature was predicted. as a result,
θs = θmax−3 ° C., and it was determined that the target area of FIG. 4B was entered. Therefore, in the subsequent extrusion, the extrusion is continued under the fifth optimum extrusion condition.

FIG. 7 shows the transition of the extrusion conditions (the billet heating temperature and the extrusion speed) up to the first to fifth extrusions. As is clear from FIG. 7, by using the extrusion control method of the present invention, the extrusion speed is improved for each extrusion number, and the extrusion speed is set to 1.46 in the fifth extrusion compared to the past actual value.
Could be doubled.

[0045]

As described above, by controlling the billet temperature and the extrusion speed by the extrusion control method of the present invention, the extrusion speed can be maximized without causing surface defects of the extruded product. Become. According to the present invention, regardless of the ability of the extrusion press, even if there is no device for measuring the temperature of the product, and even if it is difficult to measure the temperature of the product, the extrusion can be performed with each press. Extrusion conditions can be controlled to the maximum speed. It also has the advantage that the range of application can be expanded not only to the normal extrusion method but also to the direct water cooling method in which the extruded product is water-cooled immediately after extrusion. It is of great industrial value in that it can be achieved without significant changes or increase in manufacturing costs.

[Brief description of the drawings]

FIG. 1 shows an example in which an extrusion control method of the present invention is applied to an extrusion press, and is an explanatory diagram of an extruder and an extrusion control device of the present invention.

FIG. 2 is an explanatory diagram in which a predicted product temperature value and an actual measured product temperature value according to the present invention are compared while changing the product shape.

FIG. 3 is an explanatory diagram in which a predicted product temperature value and an actually measured product temperature value according to the present invention are compared under different extrusion conditions.

FIGS. 4 (a) and 4 (b) are illustrations showing the relationship between the extrusion limit speed and the billet temperature and showing the concept of the present invention.

FIG. 5 is a flowchart showing a control method according to the present invention.

FIG. 6 is a flowchart following the mark * in FIG. 5;

FIG. 7 is an explanatory diagram showing an example of application of the control method of the present invention, showing transition of the extrusion speed depending on the number of extrusions.

FIG. 8 is an explanatory view schematically showing a conventional extruder and an infrared radiation thermometer.

FIG. 9 is an explanatory view schematically showing a conventional extruder (direct water cooling) and an infrared radiation thermometer.

[Explanation of symbols]

 1: Extrusion press, 2: Extruded product, 3: Billet, 4: Die, 5: Temperature measurement device, 6: Extrusion load detector, 7: Extrusion speed detector, 8a: Product temperature prediction device, 8b: Determination of extrusion conditions 9; Extrusion speed controller, 10; Billet heating temperature controller, 11; Billet heating device, 12; Die heating device, 20; Container, 21; Stem, 22; Platen, 23; Shower, 30; Infrared thermometer

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-3-151116 (JP, A) JP-A-60-196220 (JP, A) JP-A-6-277750 (JP, A) Japan Plastic Working Co., Ltd. Academic Society, Extrusion -From Basic to Advanced Technology-, Japan, Corona Co., Ltd., July 20, 1992, 34-35, 79-80 (58) Fields investigated (Int. Cl. ⁷ , DB name) B21C 31/00

Claims (4)

(57) [Claims] 1. Among the extrusion conditions, at least from the actual measured values of the billet temperature, the die temperature, the extrusion speed, and the extrusion load during extrusion, the temperature of the extruded product is determined by the heat generated by processing and the heat generated by the die.
Heat during extrusion assumed to be affected only by heat transfer
From the balance equation of the quantity, the product temperature immediately after extrusion is predicted, and based on the predicted value, the billet temperature is set so that the extrusion speed is the highest possible in the range where extrusion production is possible and product surface defects do not occur. An extrusion control method characterized by controlling. 2. A load limit of an extrusion press and a surface defect occurrence limit temperature of an extruded product are set in advance, and these set values are compared with the predicted product temperature value under actual extrusion conditions and an actually measured extrusion load value. Then, determine the possibility of further extrusion speed improvement, if determined possible, the extrusion speed within the extrusion load limit, and the highest speed within the range of the product surface defect occurrence limit temperature or less. 2. The extrusion control method according to claim 1, wherein the billet temperature is controlled. 3. The product temperature (θs) immediately after extrusion is calculated as follows:
The extrusion control method according to claim 3, wherein the method is performed by a prediction formula. Prediction _{equation: θs = θb + Δθ 1 -} [(H · R) / (C · ρ
Sb · v)] × (θb + Δθ ₁ / 2−θd), where
θs: product temperature (° C), θb: billet heating temperature
(° C.), Δθ ₁ = (Fs · J ⁻¹ ) / (C · ρ · Sb),
H: heat transfer rate from the extruded material to the tool [kcal / (m
in. ° C.)], R: extrusion ratio, C: specific heat of extruded product [kc
al / (kg · ° C)], ρ: Density of extruded product [kg /
(M ³ )], Sb: billet cross-sectional area (m ² ), v: extrusion
Speed (m / min), θd: Die heating temperature (° C), F
s: End load of extrusion (kgf), J: work equivalent of heat [kgf
・ M / kcal] 4. The extrusion according to claim 1, wherein
A control device used for a control method, wherein a heated village
Device for measuring the temperature of the die and the temperature of the heated die
Device to measure, device to measure extrusion load, extrusion speed
And the temperature measured by these devices
Predict product temperature at die exit based on weight and extrusion speed information
Equipment, this product temperature predicted value and the set surface defect occurrence limit
Results of comparison with ambient temperature, actual measured values of extrusion load and set load limit
Based on the result of comparison with the boundary value, set the extrusion speed to the extrusion load limit.
Best in the industry and within the range where product surface defects do not occur
Extrusion condition deciding equipment to decide billet temperature to make speed
And the billet heating temperature and extrusion
An extrusion control device comprising a regulator for adjusting each of the speeds.