JPH10337763A - Temperature control method and temperature control device for injection molding machine - Google Patents

Abstract

(57) [Problem] To provide a temperature control method of an injection molding machine capable of obtaining a set axial temperature pattern without occurrence of a local overheating portion. SOLUTION: A heating cylinder (2) of an injection molding machine (1).
Is a plurality of temperature control zones (K1, K2, ...) in the axial direction.
And one of the divided temperature control zones (K1) is adjacent to the low-temperature section (7) and the other is adjacent to the high-temperature second temperature control zone (K2). K1), the first and second heaters (H1
-1 and H1-2), the first heater (H
1-1) is a main operation amount ｛u obtained by feedback control based on the detected temperature {y (k)} of the temperature sensor (S1) provided in the first temperature control zone (K1).
₁₁ (k) The second heater (H1-2) controlled by｝
Is a margin amount calculation value {U _max, which is a deviation between the main operation amount {u ₁₁ (k)} and the operation amount upper limit value or an arbitrary set value (U _max ).
−u ₁₁ (k)} is controlled by the compensation operation amount {u ₁₂ (k)} subtracted from the main operation amount {u ₁₁ (k)}.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heating means in which a heating cylinder of an injection molding machine is divided into a plurality of temperature control zones in an axial direction, and a plurality of heating means are provided corresponding to each of the divided temperature control zones. The present invention relates to a method for controlling the temperature of an injection molding machine and a temperature control device used for carrying out this method.

[0002]

2. Description of the Related Art As is well known, an injection molding machine includes a heating cylinder to which a resin material is supplied. Further, a screw for kneading and melting the supplied resin material is provided therein. Such a heating cylinder 30
Are divided into a plurality of first, second,... Temperature control zones k1, k2,... In the axial direction, as shown in FIG. A plurality of, for example, two first and second heaters h1-1 and h1-2 are provided on the outer peripheral portion of the heating cylinder 30 belonging to the first temperature control zone k1. Similarly, the second, third,... Temperature control zones k
The first and second heaters h2-1, h2-
2, h3-1, h3-2,... The first, second,... Thermocouples s1, s2,... Are provided at predetermined depth positions of the heating cylinder 30 in correspondence with the first, second,. Have been.

FIG. 4 shows an example in which only the first and second heaters h1-1 and h1-2 provided in the first temperature control zone k1 are controlled. The heaters h1-1, h1-2, h2-1, h2-2,... Are generally controlled by a control device by feedback control. This control device includes an addition point 40 and a PID control calculator 41, as is well known. Then, in addition to the summing point 40, and the set temperature r ₁₁ set by the setter, the first heating cylinder temperature control zone k1 detected by the thermocouple s1 for detecting the temperature of the first temperature control zones k1 is input and the temperature, ie the controlled variable y ₁₁ 30, the deviation e ₁₁ is manipulated variable u ₁₁ by proportional-integral-derivative (PID) operation in PID control calculation unit 41 is calculated, and the first and second heater h1- The same operation amount is output to 1, h1-2.

Therefore, each temperature control zone k1, k
.. Are set, and the proportional (P) constant, integral (I) constant, differential (D) constant and the like in each temperature control zone are adjusted, so that the first, second,. , K
2, first and second heaters h1-1, h1-2, h2-
Are heated and the heating cylinder 30 is heated.
When the resin material is supplied from the hopper 31 and the screw is driven to rotate, the first and second heaters h1-1, h1-2,
The resin material is plasticized by the heat applied from h2-1, h2-2,... and the heat generated by the shearing force and the frictional force due to the rotation of the screw.

[0005]

As described above, since each of the conventional heaters is also controlled by feedback, plasticization can be performed temporarily, but the first temperature control zone adjacent to the cooling section 33 can be used. There is a problem with k1. That is, the resin material is supplied from the hopper 31 to the heating cylinder 30. However, if the resin material is softened near the resin material inlet at the lower part of the hopper 31, cross-linking occurs and smooth supply cannot be performed. Therefore, jackets 32, 32,... Are provided in the vicinity of the resin material inlet, and are cooled by, for example, water. These jackets 32, 32,... Become the cooling unit 33, and the first temperature control zone k1 adjacent to the cooling unit 33 is feedback-controlled so as to compensate for the amount of heat taken by the cooling unit 33, and is maintained at the set temperature. You. As a result, the amount of heat taken away on the cooling unit 33 side of the first temperature control zone k1 and the amount of heat generated by the first heater h1-1 are balanced.
However, on the side of the second temperature control zone k2, the second
Under the influence of the heat of the first heater h2-1 in the temperature control zone k2, the heat supplied by the second heater h1-2 in the first temperature control zone k1 becomes excessive.
As a result, a portion where the temperature is equal to or higher than the set temperature, that is, an excessively high temperature rising portion is generated between the first temperature control zone k1 and the second temperature control zone k2.

The overheated portion Oh generated by the experiment is shown in FIG. In the experiment, a test device having the same structure as the heating cylinder was used, and the set temperature was set to 120 ° C. in all of the first, second,... Temperature control zones k1, k2,. First temperature control zone k1
The temperature of this overheated portion Oh measured by a thermocouple s provided between the second temperature control zone k2 and the second temperature control zone k2 is about 128 ° C.
Met.

When the overheated portion Oh occurs, the resin material existing inside the heating cylinder 30 is burnt, or the burnt resin adheres to the screw surface, the inner peripheral surface of the heating cylinder 30 and the like. , Which may cause molding failure. When the overheated portion Oh is generated, the heat is transmitted to the adjacent second temperature control zone k2. However, the second temperature control zone k2 is also heated from the adjacent third temperature control zone k3. Therefore, the second temperature control zone k2 satisfies the set temperature by the heat, and depending on whether the set temperature is high or low, the first and second heaters h2-1 and h2-1 of the second temperature control zone k2 may be used. In the case of 2-2, there is also a problem that it is always off and is in an uncontrolled state.

Therefore, a method of controlling the temperature of the heating cylinder in which the occurrence of the overheated portion Oh is suppressed is disclosed in, for example, Japanese Patent Laid-Open No. 3-1.
No. 920. This temperature control method
When a gap occurs between the measured temperature and the set temperature of the temperature control zone adjacent to the cooling unit, the set temperature of the temperature control zone is reset to substantially match the measured value. Although the occurrence of the overheated portion Oh is suppressed by this temperature control method, the compensation operation of the adjacent temperature control zone is not taken into consideration, so that the entire temperature of the temperature control zone is lowered, and It is expected that the temperature pattern in the axial direction cannot be obtained.

[0009] The excessive temperature raising section Oh controls the operation amount of the second heater h1-2 in the first temperature control zone k1.
The problem can be solved by setting the operation amount of the first heater h1-1 on the cooling unit 33 side lower than the operation amount. However, during molding suspension and molding, the type of resin material used,
It is difficult to maintain optimal conditions with a unique operation amount for various conditions such as molding conditions. Moreover,
First heater h1-1 in first temperature control zone k1
When the second heater h1-2 and the second heater h1-2 are controlled as independent zones, it is possible to suppress the temperature rise of the overheating portion Oh to some extent. However, this control method also only subdivides the temperature control zone, and does not take into account the compensation operation of the adjacent temperature control zone. Such an excessively-heated portion also occurs in the temperature control zone at the tip of the nozzle, and has the same problem of poor molding. An object of the present invention is to provide a temperature control method and a temperature control device for an injection molding machine that have solved the conventional problems that have not yet been sufficiently solved, as described above. It is an object of the present invention to provide a temperature control method of an injection molding machine which does not generate a excessively high temperature rising portion and can obtain a temperature pattern in an axial direction as set, and a temperature control device used for implementing the method.

[0010]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides feedback control to a heater closer to a low temperature part among heaters provided in a target temperature control zone. And the compensation operation amount obtained by subtracting the operation amount upper limit value or an arbitrary set value from the main operation amount is applied to the heater closer to the high-temperature portion. That is, according to the present invention, in order to achieve the above object, a heating cylinder of an injection molding machine is divided into a plurality of temperature control zones in an axial direction, and a plurality of heating cylinders are provided corresponding to each of the divided temperature control zones. Controlling the heating means, the temperature control method of the injection molding machine, one side is adjacent to a low temperature part such as a cooling flange, a mold,
When controlling the heating means provided in the temperature control zone adjacent to the high temperature part heated by the heating means or the like, the heating means adjacent to the low temperature part is provided in the temperature control zone. The heating means adjacent to the high-temperature section controls the main operation amount, the operation amount upper limit value, an arbitrary set value, and the like, by controlling the main operation amount obtained by feedback control based on the temperature detected by the temperature sensor. A margin calculation value, which is a deviation, is controlled by a compensation operation amount subtracted from the main operation amount. According to a second aspect of the present invention, the margin calculation value according to the first aspect includes a set temperature of an excessively high temperature rising portion between a target temperature control zone and a high temperature portion adjacent to the temperature control zone; The set temperature and the detected temperature of the overheated portion according to claim 2 are determined by calculation from the detected temperature of the overheated portion, and the invention according to claim 3 is configured such that the target temperature control zone From the respective set temperatures and the respective detected temperatures of the high temperature portion adjacent to the temperature control zone,
It is configured to be obtained by an interpolation operation. Claim 4
The heating cylinder of the injection molding machine is divided into a plurality of temperature control zones in the axial direction, one of the divided temperature control zones is adjacent to a cooling flange, a low-temperature portion such as a mold, and the other is A temperature control device for controlling a plurality of heating means provided in a temperature control zone adjacent to a high-temperature portion heated by a heating means or the like, wherein the temperature control device includes first, second, and third A set temperature and a detected temperature of a target temperature control zone are input to the first addition unit, and the adjustment operation unit is configured to control the first addition unit. The main operation amount of the first heating means closer to the low-temperature portion of the target temperature control zone is calculated based on the deviation obtained by the combining unit, and the second adding unit includes an operation amount upper limit value or Arbitrary setting values etc. and obtained with the adjustment operation unit The main operation amount is input to the third addition unit, and the margin calculation value, which is the deviation obtained by the second addition unit, and the main operation amount obtained by the adjustment operation unit are input to the third addition unit. It is configured to input and output a compensation operation amount of the second heating means closer to the high temperature portion of the target temperature control zone. According to a fifth aspect of the present invention, the one input terminal of the second adding unit according to the fourth aspect includes a target temperature control zone and a high-temperature portion adjacent to the temperature control zone. The calculated value calculated based on the deviation between the set temperature of the excessively-heated section and the detected temperature is input.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described with reference to FIG. Injection molding machine 1 according to the present embodiment
Is equipped with a heating cylinder 2 as is well known in the art.
The heating cylinder 2 is divided in the axial direction into a plurality of, for example, four first to fourth temperature control zones K1, K2, K3, and KN for convenience. First and second heaters H1-1 and H1-2 are provided on the outer peripheral portion of the heating cylinder 2 of the divided first temperature control zone K1, and the heating cylinder 2 of the second temperature control zone K2 is Similarly, first and second heaters H2-1 and H2-2 are also provided on the outer peripheral portion, and similarly, heaters are appropriately provided on the outer peripheral portion of the heating cylinder 2 in other zones. The temperature sensors S1, S2 are located at predetermined depth positions of the heating cylinder 2 in the temperature control zones K1, K2, K3, and KN.
2, S3 and SN are attached. The heaters H1-1, H2-1, H2-2,... Provided in each temperature control zone K1, K2, K3, KN are other than the second heater H1-2 in the first temperature control zone K1. Is controlled by, for example, feedback control so that the detected temperatures detected by these temperature sensors S1, S2, S3, and SN become the set temperatures. In FIG. 1, the target first temperature control zone is shown. Heater H1-
1, only an example of controlling H1-2 is shown.

A hopper 5 for supplying the resin material J to the heating cylinder 2 is provided on the right side of the heating cylinder 2 in FIG. The throttle portion of the hopper 5 communicates with the heating cylinder 2, but a water jacket 6 is attached so as to surround the vicinity thereof, and is maintained at a temperature lower than the softening point of the resin material J by a cooling fluid such as water. Thereby, the resin material J
Is smoothly supplied to the heating cylinder 2 without softening, and is bitten into the screw. This water jacket 6 is located adjacent to the first temperature control zone K1
It has become.

The temperature control device 10 according to the first embodiment shown in FIG. 1 includes a first addition point 11,
It comprises an adjustment operation unit, that is, a PID control calculator 12, second and third addition points 13, 14, and the like. One input terminal of the first addition point 11 is connected to the temperature setting device 16 and the signal line a, and the other input terminal is connected to the first input terminal.
The temperature sensor S1 is connected to the signal line b.
The output terminal of the first addition point 11 is connected to the PID control calculator 12 by a signal line c, and the output terminal of the PID control calculator 12 is connected to the first terminal of the first temperature control zone K1.
Is connected to the heater H1-1 by a signal line d,
The main operation amount obtained by the PID control calculator 12 is directly
Is applied to the heater H1-1.
From the signal line d, a signal line e branches, and the signal line e further branches to a second and third addition points 1.
3 and 14 are respectively connected to one input terminal.
Hardware upper limiter 17 and third addition point 1
Reference numeral 3 denotes a signal line which connects the output terminal of the second addition point 13 and the other input terminal of the third addition point 14 by a signal line g. The output terminal of the third addition point 14 is connected to the second heater H1-2 via the signal line h, so that the calculated compensation operation amount is applied.

Next, the operation of the above embodiment will be described. Since the heaters H2-1, H2-2,... Provided in the temperature control zones K2 to KN are controlled by the conventional feedback control as described above, the heaters H2-1, H2-2,. The control of the first and second heaters H1-1 and H1-2 will be described.
The proportional constant, integral constant, differential constant and the like of the PID control calculator 12 are adjusted. The heater H1-
1. The heating temperature r (k) of H1-2 is set. Also, 100% or an arbitrary constant is set as _Umax by the upper limit setting unit 17 of the hardware. When the resin material J is supplied from the hopper 5 to the heating cylinder 2 and the screw is rotationally driven, the heating heaters H1-1, H2-1, H2-1-
The resin material is plasticized by the heat applied from 2,... And the heat generated by the shearing force and the frictional force due to the rotation of the screw, as is well known in the art.

At this time, the temperature y (k) in the first temperature control zone K1 is detected by the temperature sensor S1,
Then, it is inputted to the first addition point 11. In this summing point 11, r (k) -y ( k) by the deviation e (k) is obtained, in well-known fashion in the PID control arithmetic unit 12, the main operation amount u ₁₁ (k) is calculated . This main operation amount u ₁₁ (k) is applied to the first heater H1-1, and the first heater H1-1 is set to the set temperature r (k).
Is controlled so that

Further, second and third addition points 13,
At 14, the second heater H1 is calculated as follows:
The compensation manipulated variable u ₁₂ (k) applied to −2 is calculated. u ₁₂ (k) = u ₁₁ (k) − {U _max −u ₁₁ (k)} (1) where u ₁₁ (k): the first heater H1 at the time point k
-1 main operation amount u ₁₂ (k): compensation operation amount of second heater H1-2 at time k U _max : upper limit of operation amount of first and second heaters H1-1 and H-1 values or any deviation of the constant (1) wherein {U _max over u ₁₁ (k)} is equivalent to the allowance of the heater at the time k. When the margin is large, a large value is subtracted from the main operation amount u ₁₁ (k) to obtain a compensation operation amount u ₁₂ (k). Conversely, as the margin amount decreases, the compensation operation amount decreases. The quantity u ₁₂ (k) approaches the main manipulated variable u ₁₁ (k). Therefore, when a large amount of operation is required to satisfy the set value, the first and second heaters H1-1 and H1-2 operate positively. When a small amount of operation is sufficient, the second heater H1 is used. The compensation operation amount u ₁₂ (k) of −2 is also automatically adjusted so as to be small. Thereby, the first and second temperature control zones K1, K2
The occurrence of an excessively high temperature portion occurring during the period is suppressed. Further, the temperature pattern in the axial direction of the heating cylinder 2 also becomes as set.

The upper limit, or any set value U _{ma x} operation amount of the heater in the first embodiment has been set by the upper limit setting device 17 of the hardware, it can also be obtained by calculation. FIG. 2 shows a second embodiment obtained by calculation. The same elements as those of the first embodiment shown in FIG. 1 are denoted by the same reference numerals and will not be described repeatedly. According to the second embodiment, the control device 10 'further includes a fourth addition point 1
1 'and a second PID control calculator 12'. Further, the temperature setting device 16 also serves as a setting device 17 'for setting the temperature of the excessively high temperature portion. Fourth addition point 1
One input terminal 1 ′ is connected to the temperature setting device 17 ′ via a signal line a ′. First temperature control zone K
1 and a second temperature control zone K2, there is provided a temperature sensor S1 'for detecting the temperature of the overheated portion, and this temperature sensor S1' and the other input of the fourth addition point 11 '. The terminals are connected by a signal line b '. The output terminal of the fourth addition point 11 'is connected to the second PID control calculator 12' by a signal line c '.

Next, the operation of the second embodiment will be described. Also the second embodiment, the main operation amount u ₁₁ of the first heater H1-1 (k) is, corresponding to the main operation amount obtained by the first embodiment u ₁₁ (k) It is clear that you are doing. The temperature r (k) 'of the overheating portion is set by the temperature setting device 17'. Temperature y (k) 'of overheating section
Is detected by the temperature sensor S1 ′ and input to the fourth addition point 11 ′. This addition point 1
At 1 ′, deviation e by r (k) ′ − y (k) ′
(K) ′ is obtained, and the upper limit value of the operation amount of the heater, that is, the surplus amount calculation value U _max (k) is calculated in the second PID control calculator 12 ′ in a known manner.

At the second and third addition points 13 and 14, the compensation operation amount u ₁₂ (k) ′ applied to the second heater H1-2 is calculated as follows. u ₁₂ (k) ′ = u ₁₁ (k) − {U _max (k) −u ₁₁ (k)} (1 ′) where u ₁₁ (k): the first heater H1 at the time point k
The main operation amount u ₁₂ of -1 (k): compensation operation amount of the second heater H1-2 at time k U _max (k): first and second heater at time k H1-
1,1-2 operation amount of the upper limit value (1 ') wherein the {U _max (k) over u11 (k)}
It is clear that this corresponds to the margin of the heater of the first embodiment at the time point k. It is also clear that the occurrence of an excessively high temperature portion between the first and second temperature control zones K1 and K2 is suppressed.

The present invention can be implemented in various forms without being limited to the above embodiments. For example, injection molding machine 1
One of the temperature control zones KN including the nozzles is in contact with a mold that is being cooled, or is in contact with a low-temperature portion because heat is radiated to the atmosphere, and the other is connected to another temperature control zone K3 of the heating cylinder 2. Therefore, this temperature control zone K
The same applies to N. In addition, since the portion where the heater is not provided is a low temperature portion, it is apparent that the present invention can be similarly applied to a temperature control zone provided with a heater adjacent to the low temperature portion.

In the second embodiment, the upper limit value of the operation amount of the heater or the calculated value U _max (k) of the margin is PID
Although it is obtained by the control calculator 12 ', it can also be obtained by PI operation, fuzzy operation or the like instead of PID operation. Further, in the second embodiment, the temperature sensor S1 'for detecting the temperature of the excessively-heated portion is provided between the first temperature control zone K1 and the second temperature control zone K2. , The temperature of the overheating portion is determined by a temperature sensor S
The temperature obtained by linearly interpolating the temperatures measured by the first and second temperature sensors S1 and S2 can be used as the detected temperature without being directly measured by 1 ′, or can be derived by steady-state heat transfer calculation. The temperature obtained from the temperature distribution equation in the axial direction can be used as the detected temperature. Similarly, the set temperature of the overheating section is the set temperature of the first temperature control zone K1 and the set temperature of the second temperature control zone K1.
From the set temperature of the temperature control zone K2 by linear interpolation.

Example 1 A control method corresponding to the first embodiment was tested in which the operation amount upper limit value of the operation amount of the heater or an arbitrary set value _Umax was fixed. In this test, a test device similar to the heating cylinder 2 was used, and a temperature sensor S was specially attached between the first temperature control zone K1 and the second temperature control zone K2, and each temperature was measured. The temperatures of the control zones K1, K2,... Were measured. Also,
For the sake of simplicity, the set temperature of all the temperature control zones K1, K2,. The result is shown in FIG. In FIG. 3, the distance from the nozzle tip is the heating cylinder 2
Corresponds to the length in the axial direction. As shown in FIG. 3, it can be seen that the conventional overheated portion Oh shown in FIG. 5 has been substantially eliminated. It can also be seen that the temperature distribution in the axial direction of the heating cylinder 2 is also substantially as set.

Embodiment 2: The upper limit value of the operation amount of the heater, that is, the allowance amount calculation value U _max (k) is determined by the PID control arithmetic unit 1
A control method corresponding to the second embodiment, which was obtained by 2 ', was tested. The other conditions were the same as in Example 1. Although not shown in the figure, substantially the same temperature distribution as in Example 1 was obtained, the overheated portion Oh was eliminated, and no substantial difference from Example 1 was recognized.

[0024]

As described above, according to the present invention, the heating cylinder of the injection molding machine is divided into a plurality of temperature control zones in the axial direction, and a plurality of heating cylinders are provided corresponding to each of the divided temperature control zones. In the temperature control method for an injection molding machine, which controls a heating means, one of which is adjacent to a low temperature part such as a cooling flange or a mold, and the other is a temperature which is adjacent to a high temperature part heated by the heating means or the like. When controlling the heating means provided in the control zone, the heating means adjacent to the low-temperature section is controlled by the main operation amount obtained by feedback control based on the detected temperature of the temperature sensor provided in the temperature control zone. The heating means adjacent to the high-temperature portion controls a margin operation value, which is a deviation between the main operation amount and the operation amount upper limit value, an arbitrary set value, or the like, with a compensation operation amount subtracted from the main operation amount. Is configured as Because there, it is possible to suppress the occurrence of localized excessive temperature rise portion, and the temperature pattern in the axial direction of the setting as is obtained. Therefore, according to the present invention, it is possible to obtain a high-precision molded product such as an optical component that causes a subtle discoloration or a molding failure without causing burns or thermal decomposition even from a resin material sensitive to a temperature change. it can. Also,
Injection molding machines generally include a control device, but there is also an advantage that the present invention can be implemented simply by providing an arithmetic unit in the provided control device.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing an injection machine and a control device according to a first embodiment of the present invention, and a control device portion is shown in a block diagram.

FIG. 2 shows an injection machine according to a second embodiment of the present invention;
FIG. 2 is a schematic diagram showing a control device, and the control device portion is shown in a block diagram.

FIG. 3 is a graph showing experimental results of a control method corresponding to the first embodiment.

FIG. 4 is a schematic diagram showing a conventional injection machine and a control device.

FIG. 5 is a graph showing experimental results of a conventional control method.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 injection machine 2 heating cylinder 7 low-temperature section 10, 10 ′ control device 11, 13, 14 first to third adding section 11 ′ fourth adding point 12 PID control calculator 12 ′ second PID control calculator K1, K2,... First, second,... Temperature control zones H1-1, H1-2, first and second heaters S1, S2,.

Claims (5)

[Claims] 1. A heating cylinder (2) of an injection molding machine (1).
Is a plurality of temperature control zones (K1, K2, ...) in the axial direction.
In a temperature control method for an injection molding machine, a plurality of heating means (H1-1, H1-2) provided corresponding to each of the divided temperature control zones are controlled. The heating means (H1-1, H1-2) provided in the temperature control zone (K1) adjacent to the low-temperature part (7) and the other is adjacent to the high-temperature part (K2) heated by the heating means or the like. When controlling (1), the heating means (H1-1) adjacent to the low temperature section (7)
Is controlled by a main operation amount {u ₁₁ (k)} obtained by feedback control by a detected temperature {y (k)} of a temperature sensor (S1) provided in the temperature control zone (K1). Heating means (H1-
2), and the main operation amount {u ₁₁ (k)}, the operation amount upper limit value, any setting values (U _max) deviation a is allowance calculated value of {U _max over u ₁₁ (k)} With the main operation amount ｛u
A temperature control method for an injection molding machine, characterized in that control is performed using a compensation operation amount {u ₁₂ (k)} reduced from ₁₁ (k)}. 2. The temperature control zone (K) in which the manipulated variable upper limit value, an arbitrary set value, and the like (U _max ) according to claim 1 are set as a target.
1) and a high temperature portion (K) adjacent to the temperature control zone (K1).
2) The temperature control method of the injection molding machine obtained by calculation from the set temperature {r (k) ′} of the overheated portion and the detected temperature {y (k) ′} of the overheated portion . 3. The set temperature {r (k) ′} and the detected temperature {y (k) ′} of the overheating portion according to claim 2 are the target temperature control zone (K1) and the temperature control. Zone (K1)
Set temperature Δr of the high temperature part (K2) adjacent to
(K)} and the detected temperature {y (k)}, the temperature control method of the injection molding machine obtained by interpolation calculation. 4. A heating cylinder (2) of an injection molding machine (1) is axially divided into a plurality of temperature control zones (K1, K2,...), And one of the divided temperature control zones (K1) is provided. A plurality of heating means (H1-) provided in a temperature control zone (K1) adjacent to a low temperature section (7) of the cooling flange and the other adjacent to a high temperature section (K2) heated by heating means or the like. Temperature control device (10) for controlling 1, H1-2)
The temperature control device (10) includes first, second, and third adding sections (11, 13, 14) and an adjusting operation section (12), and the first adding section ( 11), the set temperature {r (k)} and the detected temperature {y (k)} of the target temperature control zone (11) are inputted, and the adjustment operation unit (1) is inputted.
2) The first heating which is closer to the low temperature part (7) of the target temperature control zone (K1) based on the deviation {e (k)} obtained by the first adding part (11). The main operation amount {u ₁₁ (k)} of the means (H1-1) is calculated, and the second addition unit (13) stores the operation amount upper limit value, an arbitrary set value, etc. (U _max ) The main operation amount {u ₁₁ (k)} obtained by the adjustment operation unit (12) is input, and the third addition unit (14) is obtained by the second addition unit (13). Margin calculated value ｛U
_max -u ₁₁ (k)} and the main operation amount {u ₁₁ (k)} obtained by the adjusting operation section (12) are input, and the high-temperature section (K2) of the target temperature control zone (K1) is input. ) Of the second heating means (H1-2) closer to (), (u ₁₂ (k))
And a temperature controller for the injection molding machine. 5. The temperature control zone (K1) to be connected to one input terminal of the second adding unit (13) according to claim 4, and the input terminal adjacent to the temperature control zone (K1). Set temperature of the overheated portion between the high temperature portion (K2)
(K) ′} and the deviation Δe between the detected temperature {y (k) ′}
(K) An operation value {U calculated based on '}
_max (k) A temperature control device of an injection molding machine to which｝ is input.