JP3984403B2 - Nozzle temperature control method for injection molding machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a temperature control method of a nozzle for an injection molding machine.
[0002]
[Prior art]
Conventionally, as a temperature control device for this type of injection molding machine nozzle, for example, the configuration shown in FIG. 3 has been adopted. In the figure, reference numeral 1 denotes a nozzle. A tip zone (hereinafter referred to as an LNH zone) is provided at the tip side of the nozzle 1, and a root zone (hereinafter referred to as an NH zone) is provided at the root side. There are two temperature adjustment zones.
[0003]
The LNH zone includes a heater 4 attached to the tip side of the nozzle 1, a thermocouple 2 that measures the temperature on the tip side of the nozzle 1, a setting device 8 that sets the temperature of the heater 4, and a measurement temperature and a set temperature. And a regulator 3 for controlling the temperature of the heater 4 based on the difference signal. The NH zone includes a heater 7 attached to the base side of the nozzle 1, a thermocouple 5 for measuring the temperature of the base side of the nozzle 1, a setting device 9 for setting the temperature of the heater 7, and a measurement temperature. It is comprised from the regulator 6 which controls the temperature of the heater 7 based on the difference signal of preset temperature.
[0004]
FIG. 4 is a temperature distribution diagram in the axial direction of the nozzle. The operation of the temperature control device will be described with reference to FIG.
[0005]
Before the molding disclosure, as indicated by solid lines, the setting devices 8 and 9 are supplied with SV _LNH-p and SV _NH-p, which are the LNH zone and NH zone preparation temperature set values 10 and 12, respectively, and the nozzle 1 Is sufficiently raised to prevent the resin at the nozzle tip from solidifying, and after the resin is purged, molding is started.
[0006]
When the yarn drawing phenomenon occurs after the start of molding, as shown by the broken lines, the setting devices 8 and 9 are set with the molding temperature set values 11 and 13 of the LNH zone and NH zone, respectively, SV _LNH-m and SV _NH-m . In general, the temperature of the nozzle 1 is lowered to prevent stringing.
[0007]
In addition, when molding is temporarily interrupted, the molding temperature setting values 11 and 13, SV _LNH-m and SV _NH-m are lower than the resin melting temperature, so that the molten resin is solidified at the tip of the nozzle 1 and cannot be purged. Therefore, SV _LNH-p and SV _NH-p which are the preparation temperature set values 10 and 12 are re-input.
[0008]
[Problems to be solved by the invention]
In the conventional temperature control method and apparatus for an injection molding machine nozzle, since only one value can be set and held in the setter, the operator needs to change the setting of the preparation temperature and the molding temperature each time. There is a problem that the molding quality is not good, such as stringing due to operation leakage.
[0009]
The present invention has been made in order to solve such problems of the prior art, and is an injection molding that can automatically switch a set value to be input to a setter according to a molding operation situation. An object of the present invention is to provide a temperature control method for a machine nozzle.
[0010]
[Means for Solving the Problems]
The temperature control method for an injection molding machine nozzle according to the present invention is capable of setting two kinds of set values in a temperature control setting device for an injection molding nozzle, and a full / semi-automatic cycle as a process for determining the molding operation status. And a step of determining whether or not a cycle time counter value is shorter than an upper limit value of the cycle time when the full / semi-automatic cycle is being continued. And a step of automatically switching the set value according to the situation .
Moreover, the nozzle for injection molding may be provided with two temperature adjustment zones, and a setter may be provided in each zone. Further, the two types of set values may be a preparation temperature set value and a molding temperature set value.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described based on examples with reference to the drawings.
[0013]
FIG. 1 is a configuration diagram of a temperature control device for an injection molding machine nozzle according to the present invention. Note that portions that are the same as or equivalent to those of the conventional example will be described using the same reference numerals. In the figure, reference numeral 1 denotes a nozzle, and two temperature adjustment zones, an LNH zone and a NH zone on the root side, are provided on the tip side of the nozzle 1.
The LNH zone includes a heater 4 attached to the tip side of the nozzle 1, a thermocouple 2 that measures the temperature on the tip side of the nozzle 1, a setting device 8 that sets the temperature of the heater 4, and a measurement temperature and a set temperature. And a regulator 3 for controlling the temperature of the heater 4 based on the difference signal. The NH zone includes a heater 7 attached to the base side of the nozzle 1, a thermocouple 5 that measures the temperature on the tip side of the nozzle 1, a setting device 9 that sets the temperature of the heater 7, and a measurement The controller 6 is configured to control the temperature of the heater 7 based on a difference signal between the temperature and the set temperature.
[0014]
The setting devices 8 and 9 are each connected to a selector 14, and a cycle time counter 15 is connected to the selector 14.
[0015]
By installing the selector 14 in the molding machine controller, as will be described later, in the setting unit 8, the SV _LNH-p which is the LNH zone preparation temperature setting value 10 and the SV _LNH-m which is the molding temperature setting value 11 are set. The setting device 9 can set two types of setting values, SV _NH-p , which is the NH zone preparation temperature setting value 12, and SV _NH-m , which is the molding temperature setting value 13, and further, the setting values can be set. It is possible to automatically switch according to the molding operation status of the molding machine.
[0016]
As shown in FIG. 4, SV _LNH-p and SV _{NH-p that} are the preparation temperature set values 10 and 12 are temperatures that are increased until the injection purge operation can be performed smoothly, and the molding temperature set values 11 and 13 are set. SV _LNH-m and SV _NH-m are temperatures lowered to a level that can prevent stringing during full-automatic molding or semi-automatic molding.
[0017]
FIG. 2 is a flowchart showing the operation of the selector.
[0018]
When the program starts, it is first determined whether or not the full / semi-automatic cycle is continuing (step S1). When the full / semi-automatic cycle is continuing, it is further determined whether or not the cycle time counter value is shorter than the upper limit value of the cycle time (step S2). If it is shorter than the upper limit, SV _LNH-m and SV _NH-m that are molding temperature set values 11 and 13 are set in the setting devices 8 and 9 to prevent stringing (steps S3 and S4). ).
[0019]
In step S1, when the full / semi-automatic cycle is not continuing, the injection purge operation can be performed smoothly. In step S2, if the cycle time counter value is longer than the upper limit value of the cycle time, there is an abnormality during molding. In the setting devices 8 and 9, SV _LNH-p and SV _NH-p which are molding temperature set values 10 and 12 are set (steps S5 and S6), respectively.
[0020]
As described above, since the setting values during molding and preparation are automatically switched by the selector 14 in a series of molding operations, it is not necessary to change the setting values by the operator.
[0021]
In the embodiment described above, there are two nozzle temperature adjustment zones, but the present invention is not limited to this.
[0022]
【The invention's effect】
The temperature control method for the nozzle for an injection molding machine according to the present invention is configured such that an operator's setting value change operation is not required, so that the operation is complicated, and stringing occurs due to a setting omission or the like. It is possible to prevent the molded product quality from being impaired.
[Brief description of the drawings]
FIG. 1 is a block diagram of a temperature control device for an injection molding machine nozzle according to the present invention.
FIG. 2 is a flowchart showing the operation of the selector.
FIG. 3 is a configuration diagram of a conventional temperature control device for a nozzle for an injection molding machine.
FIG. 4 is a temperature distribution diagram in the axial direction of the nozzle.
[Explanation of symbols]
1 Nozzle 2 Thermocouple (LNH zone)
3 Controller (LNH zone)
4 Heater (LNH zone)
5 Thermocouple (NH zone)
6 Controller (NH zone)
7 Heater (NH zone)
8 Setting device (LNH zone)
9 Setting device (NH zone)
10 Preparation temperature set value (LNH zone)
11 Molding temperature setting value (LNH zone)
12 Preparation temperature set value (NH zone)
13 Molding temperature setting value (NH zone)
14 Selector 15 Cycle time counter

Claims (3)

Two setting values can be set in the temperature control setting device (8, 9) of the injection molding nozzle (1).
Whether the full / semi-automatic cycle is continuing as the process of determining the molding operation status, and if the full / semi-automatic cycle is continuing, is the cycle time counter value shorter than the upper limit of the cycle time? Determining whether or not,
And a step of automatically switching the set value in accordance with the molding operation status . A temperature control method for an injection molding machine nozzle. 2. The injection molding machine according to claim 1, wherein the injection molding nozzle is provided with two temperature adjustment zones, each of which is provided with a setting device. Nozzle temperature control method.   The temperature control method for a nozzle for an injection molding machine according to claim 1 or 2, wherein the two kinds of set values are a preparation temperature set value (10, 12) and a molding temperature set value (11, 13). .

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