JP3104023U - Mold temperature control system - Google Patents

Abstract

An object of the present invention is to provide a mold temperature control system capable of obtaining a high-quality molded product having a simple configuration, a short cycle time, and no defects such as welds.
A mold temperature control system according to the present invention is a cooling water supply pipe for supplying cooling water to the mold in a mold temperature control device provided in a molding machine for controlling a temperature of a mold for performing resin molding. Automatic opening / closing valves 51 to 54 provided on the road and cooling water by delayed opening / closing control delayed for a predetermined time from the mold closing time for the automatic opening / closing valves 51 to 54 based on a mold closing signal generated at the time of closing the mold. And control means 60 for cooling the mold by supplying the liquid.
[Selection diagram] FIG.

Description

  The present invention relates to a mold temperature control system applied to a mold for performing resin molding.

Conventionally, temperature control of a mold for molding a desired molded product using, for example, a thermoplastic resin material is usually performed using a mold temperature control device so that the mold always keeps a constant temperature.
That is, since the surface temperature of the mold rises due to the heat of the resin when the high-temperature resin material flows into the mold, the mold temperature controller supplies cooling water to the mold so as to remove the heat of the resin, It is adjusted to keep a constant temperature.

  More specifically, in the past, when a molten resin is poured into a mold, a method in which the surface temperature of the mold cavity is set high and the temperature of the mold is lowered by supplying cooling water after the casting (heat cycle method) is often used. Have been.

  However, in the case of such a conventional method, there is a problem that the cycle time becomes long because the heating medium and the cooling medium need to be repeatedly flowed.

  Patent Literature 1 discloses a metal mold having a fixed mold, a movable mold, and complicated elements such as a plurality of spools, a plurality of cavities, a plurality of flow circuits, a temperature control circuit, and the like, which improve moldability. A thermosetting resin injection molding device provided with a mold has been proposed.

However, in the case of the injection molding apparatus disclosed in Patent Document 1, the configuration of the mold is considerably complicated, and accordingly, the supply control of a temperature control medium such as a heating medium and a cooling medium to the mold is also complicated. It encompasses the problem.
JP-A-11-207784

  The problem to be solved is that there is no mold temperature control system capable of obtaining a molded product having a simple structure, a short cycle time, no defects such as welds, and excellent moldability.

  The present invention provides an automatic opening / closing valve in a cooling medium supply pipe for supplying a cooling medium to a mold for performing resin molding, and the automatic closing valve is generated based on a mold closing signal generated at a time of closing the mold during resin molding. The most main feature is that the mold is cooled by supplying a cooling medium by delayed opening / closing control for a predetermined time from the time of closing the mold of the on-off valve.

According to the present invention, the following effects can be obtained.
That is, according to the invention of claim 1, an automatic opening / closing valve is provided in a cooling medium supply pipe for supplying a cooling medium to a mold for performing resin molding, and a mold generated when the mold for resin molding is closed. A mold temperature control mechanism comprising: means for supplying a cooling medium by delay opening / closing control for a predetermined time from the mold closing time of the automatic opening / closing valve based on a mold closing signal to cool the mold. Since it is provided, the appearance of the molded product can be made high quality by improving the transferability of the mold surface to the molded product and preventing the occurrence of weld lines, and the cooling of the molding process can be achieved by delayed cooling. A mold temperature control system that can be cycled up can be provided.

According to the present invention, there is provided an automatic opening / closing valve provided in a cooling medium supply pipe for supplying a cooling medium from the mold temperature adjusting device to the mold, comprising a molding machine and a mold temperature adjusting device, With the configuration provided with the control means for performing the control, it is possible to exhibit the same effect as the invention according to the first aspect.
According to the invention as set forth in claim 3, an automatic opening / closing valve and a control means for performing delayed opening / closing control on a cooling medium supply pipe for supplying a cooling medium in a manifold interposed between the mold temperature adjusting device and the mold. With the configuration provided with the above, the same effect as the invention of the first aspect can be exhibited.

  The purpose of the present invention is to obtain a high-quality molded product with a simple configuration, a short cycle time, and no defects such as welds. An automatic opening / closing valve provided in a cooling medium supply pipe for supplying a cooling medium to the mold in the apparatus, and a mold closing time for the automatic opening / closing valve based on a mold closing signal generated at the time of closing the mold. And control means for cooling the mold by supplying a cooling medium by delayed opening / closing control delayed for a predetermined time from the above.

Hereinafter, embodiments of the present invention will be described in detail.
(Example 1)
First Embodiment A mold temperature control system according to a first embodiment of the present invention will be described with reference to FIGS.

  FIG. 1 is a schematic front view of the mold temperature control system of the first embodiment, FIG. 2 is a side view of the mold temperature control device of the first embodiment, and FIG. 3 is a rear view of the mold temperature control device of the first embodiment. FIG. 4 is a schematic piping system diagram of the mold temperature control device of the first embodiment. FIG. 5 is a specific piping system diagram of the mold temperature control device of the first embodiment. FIG. 2 is a block diagram showing a main control system of the mold temperature control system.

  The mold temperature control system according to the first embodiment includes a molding machine 30 equipped with a molding die (hereinafter, referred to as a “mold”) for molding a molded product such as a thermoplastic resin product, and a mold temperature control device. 1 is connected and combined by a piping system 48 and an electric system 49.

  The mold mounted on the molding machine main body 30A of the molding machine 30 includes a movable mold, a fixed mold, a sprue, and a punch for molding a thermoplastic resin material. Further, the molding machine main body 30A includes an operation panel 18 for performing various setting operations such as temperature setting, and a hopper 19 for charging a thermoplastic resin material.

  The mold temperature control device 1 includes a box-shaped device main body 2, and the device main body 2 includes a caster 3 for traveling on a floor surface and a fixture 4 for fixing the floor surface at the bottom. On the front surface of the apparatus main body 2, temperature control means 5A to 5C for a cooling water system, which is a cooling medium system for supplying and discharging cooling water to and from a fixed type, a movable type, a sprue, and a punch, which are elements to be cooled in a mold. For example, a group of four controllers constituting the 5D (see FIG. 4) is arranged.

  As shown in FIG. 4, the four controller groups include a fixed-side temperature controller 6a, a movable-side temperature controller 6b, a sprue temperature controller 6c, and a punch temperature controller 6d. In addition, four pressure gauges 7a to 7d are arranged on the front of the apparatus main body 2 in correspondence with the four controller groups, for example. Further, a supply water pressure gauge 7f is arranged next to the four controller groups.

Next, the configuration of the rear wall of the apparatus main body 2 will be described with reference to FIG.
At a substantially central portion of a rear wall portion of the apparatus main body 2, a single cooling water supply port 11 and a single cooling water discharge port 12 in each of a plurality of cooling water systems are provided so as to be adjacent to each other. In addition, a purge air connection port 13 is provided below the cooling water supply port 11 on the rear wall of the apparatus main body 2.

  Further, a cooling water supply port (with a stop valve) 14a to a fixed mold (not shown) in the mold and a cooling water return port (with a stop valve) from the fixed mold are provided at a lower side of the rear wall portion of the apparatus main body 2. 14b, a cooling water supply port (with a stop valve) 15a to a movable mold (not shown), and a cooling water return port (with a stop valve) 15b from the movable mold are provided.

On the upper side of the rear wall portion of the apparatus main body 2, a supply port (with a stop valve) 16a for cooling water to a sprue (not shown) in the mold and a return port (with a stop valve) 16b for cooling water from the sprue are shown in the drawing. A cooling water supply port (with a stop valve) 17a to the punch not to be provided and a cooling water return port (with a stop valve) 17b from the punch are provided.
FIG. 2 shows a state where the single cooling water supply port 11, the supply port 14a, the return port 14b, and the like described above are viewed from the side of the apparatus main body 2.

Next, the entire piping system of the mold temperature control device of the first embodiment will be described with reference to FIGS.
In the apparatus main body 2, cooling water supplied from a single cooling water supply port 11 is sent to a distribution pipe 31 via a filter 21, a pressure reducing valve 22, and a stop valve 23, and the cooling water is supplied to the four systems by the distribution pipe 31. And supplied to the temperature control means 5A to 5D in the cooling water system. Further, on the inlet side of the distribution pipe line 31, purge air is supplied from the purge air connection port 13 through the stop valves 25 and 26. The distribution pipe 31 is connected to a pressure switch 27 and the supply water pressure gauge 7f. On the other hand, cooling water (cooling drainage) of the four systems and the like discharged from the temperature control means 5A to 5D is collected by the water collecting pipe 32 and sent to the single cooling water discharge port 12. It has become.

  As shown in FIG. 5, the temperature adjusting means 5A includes a pump 41 for sucking and pumping the cooling water from the distribution pipe line 31 and a heater section 42 for heating and adjusting the cooling water from the pump 41 to a predetermined temperature. The cooling water whose temperature has been adjusted by the heater section 42 is sent to the fixed mold via the supply port 14a. A relief valve 43 is connected to the heater section 42, and the pressure gauge 7a is connected to an outlet side of the heater section 42.

Further, an automatic opening / closing valve (sequential valve) 51 is connected between the heater section 42 and the supply port 14a.
On the other hand, the cooling water (cooling drainage) circulating through the fixed type and returning to the temperature control means 5A from the return port 14b is sent to the water collecting pipe 32 via the solenoid valve 44.

  In the first embodiment, a stop valve 45 and a thermocouple 46 are provided in a pipe connecting the return pipe of cooling water (cooling drainage) and the suction side of the pump 41. Further, a stop valve 47 is provided in a pipe connecting the supply port 14a and the return port 14b.

Each of the temperature adjusting means 5B, 5C, and 5D has the same configuration as that of the temperature adjusting means 5A.
Then, an automatic opening / closing valve (sequential valve) 52 is connected between the heater section 42 of the temperature adjusting means 5B and the supply port 15a. An automatic on-off valve (sequential valve) 53 is connected between the heater section 42 of the temperature control means 5C and the supply port 16a. An automatic opening / closing valve (sequential valve) 54 is connected between the heater section 42 of the temperature control means 5D and the supply port 17a.

  The control system shown in FIG. 6 controls the automatic opening / closing valves 51 to 54 by the control means 60 based on a mold closing signal issued when molding is performed by the mold in the molding machine 30 for a predetermined time T1 shown in FIG. The opening / closing control is performed with a delay (about several seconds). The delay operation of the predetermined time T1 is executed by, for example, a timer operation of the timer unit 55 or program control based on a program stored in the control unit 60 in advance.

Next, the operation of the mold temperature control system according to the first embodiment will be described mainly with reference to FIGS. 7 and 8 mainly by means of the mold temperature control using the automatic opening / closing valves 51 to 54. .
In the mold temperature control system of the first embodiment, when the molding machine 30 performs the molding process using the thermoplastic resin material, as shown in FIG. The molding machine 30 outputs a mold closing signal (step S1). The control means 60 having received the mold closing signal generates a valve opening drive signal delayed by a certain time T1 (several seconds) from the time when the mold is closed by a timer operation or program control (step S2). A valve opening drive signal is transmitted to the automatic open / close valves 51 to 54 to open the automatic open / close valves 51 to 54 (step S3).

  Thereby, the cooling water is sent from the temperature adjusting means 5A to 5D to the fixed mold, the movable mold, the sprue, and the punch, respectively, and the cooling operation of the mold is started (Step S4). Then, after a lapse of a predetermined time (T2 time shown in FIG. 8), the control means 60 sends a valve closing drive signal to the automatic opening / closing valves 51 to 54 to close the automatic opening / closing valves 51 to 54 (step S5).

  By such a series of operations, as shown in FIG. 8, the surface temperature of the mold, which rises from the time when the mold is closed, is reduced by, for example, 70 degrees Celsius in the cooling operation for a predetermined time T2 from the time when the predetermined time T1 is delayed. Temperature (set temperature), during which time the transfer of the mold surface to the molded product can be improved, and the appearance of the molded product can be improved by avoiding the occurrence of weld lines and improving the quality. It is possible to increase.

  In the case of the constant temperature control as in the conventional example, the temperature of the mold is reduced to, for example, 90 degrees Celsius (set temperature) as shown in the upper section of FIG. For example, by the delayed opening / closing control of the automatic opening / closing valves 51 to 54, the temperature control for the mold becomes a mode of emphasizing the cooling, and the set temperature of the mold temperature control device 1 can be set lower by about 20 degrees. As a result, there is an advantage that it is possible to reduce the power consumption when executing the means for controlling the mold temperature by the mold temperature control system according to the first embodiment and to reduce the electricity bill.

  In addition, comparing the first embodiment with the case of constant temperature control of the conventional example, as shown in FIG. 8, the cooling operation is performed from the time of closing the mold until the mold temperature is lowered to the set temperature as shown in FIG. In the first embodiment, the time is shorter by the time difference T3, and according to the first embodiment, the cycle can be increased by the time difference T3.

(Example 2)
Next, a second embodiment of the present invention will be described with reference to FIG.
The mold temperature control system according to the second embodiment includes a manifold unit 90 having a supply-side manifold 91 and a return-side manifold 93 between the mold temperature control device 1 and the mold 100. A control box 92 having the function of the control means 60 is arranged in the unit 90.

Among the outlets 91a to 91f to the cooling water supply pipes of the system 8 and the like connected to the mold 100 in the supply side manifold 91, for example, the outlets 91a, 91b, 91c and 91d of the system 4 and the like are the same as those in the first embodiment. The same automatic opening / closing valves 51, 52, 53 and 54 are arranged, and the control system similar to the control system shown in FIG. 6 utilizes the mold closing signal from the molding machine 30 in the process shown in FIG. The automatic on-off valves 51, 52, 53, and 54 perform delayed opening and closing control to adjust the temperature of the mold 100.
The number of the automatic opening / closing valves is not limited to four, but can be arbitrarily selected, such as eight, five, six, or the like.

  In the case of the first embodiment, the configuration of the second embodiment employing the manifold unit 90 having the automatic opening / closing valves 51, 52, 53, 54 between the mold temperature controller 1 and the mold 100 having the above-described configuration is adopted. By cooling the mold 100 in the same manner as described above, it is possible to improve the transferability of the surface of the mold 100 to the molded product 101, avoid the occurrence of weld lines, improve the appearance of the molded product 101, and improve its quality. Can be increased. Further, similarly to the case of the first embodiment, it is also possible to reduce the power consumption and the electricity bill. In FIG. 9, reference numeral 103 denotes a weld.

  The present invention can be applied not only to the above-described embodiment but also to a mold configuration in which the number of elements to be cooled is six or more than six, and even in this case, transferability to a molded product can be improved and weldability can be improved. The appearance can be improved and the quality can be improved by avoiding the lines.

1 is a schematic front view of a mold temperature control system according to a first embodiment of the present invention. FIG. 2 is a side view of the mold temperature control device according to the first embodiment of the present invention. FIG. 2 is a rear view of the mold temperature control device according to the first embodiment of the present invention. 1 is a schematic piping system diagram of a mold temperature control device according to a first embodiment of the present invention. FIG. 2 is a specific piping system diagram of the mold temperature control device according to the first embodiment of the present invention. FIG. 2 is a block diagram illustrating a main control system of the mold temperature control system according to the first embodiment of the present invention. 4 is a flowchart illustrating a temperature control process performed by the mold temperature control system according to the first embodiment of the present invention. FIG. 4 is an explanatory diagram showing the relationship between the operation of the automatic on-off valve according to the first embodiment of the present invention and the temperatures of the mold and the molded product. FIG. 4 is a schematic piping diagram of a mold temperature control system according to a second embodiment of the present invention.

Explanation of reference numerals

REFERENCE SIGNS LIST 1 mold temperature control device 2 device main body 3 caster 4 fixture 5A to 5D temperature control means 6a fixed side temperature controller 6b movable side temperature controller 6c sprue temperature controller 6d punch temperature controller 7a to 7d pressure gauge 7f supply water pressure gauge DESCRIPTION OF SYMBOLS 11 Cooling water supply port part 12 Cooling water discharge port part 13 Purge air connection port 14a Supply port 14b Return port 15a Supply port 16a Supply port 17a Supply port 18 Operation panel 19 Hopper 21 Filter 22 Pressure reducing valve 23 Stop valve 25 Stop valve 25, 26 Stop Valve 27 Pressure switch 30 Molding machine 30A Molding machine main body 31 minute piping 32 Water collecting pipeline 41 Pump 42 Heater 43 Relief valve 44 Solenoid valve 45 Stop valve 46 Thermocouple 47 Stop valve 48 Piping system 49 Electrical system 51 to 54 Automatic opening and closing Valve 55 timing Stage 60 the control unit 90 manifold unit 91 supply side manifold 91a~91f outlet 92 control box 93 back side manifold 100 die 101 moldings 103 Weld

Claims (3)

  An automatic opening / closing valve is provided in a cooling medium supply pipe for supplying a cooling medium to a mold for performing resin molding, and a metal for the automatic opening / closing valve is generated based on a mold closing signal generated at the time of closing the mold during resin molding. A mold temperature control system comprising a mold temperature control mechanism, comprising: means for cooling a mold by supplying a cooling medium by delayed opening / closing control for a predetermined time from a mold closing time. An automatic on-off valve provided on a cooling medium supply pipe for supplying a cooling medium to the mold in a mold temperature control device for controlling the temperature of a mold for performing resin molding provided in a molding machine,
Control means for cooling the mold by supplying a cooling medium by a delayed opening / closing control delayed by a predetermined time from the mold closing time to the automatic opening / closing valve based on a mold closing signal generated at the time of closing the mold;
A mold temperature control system including a mold temperature control mechanism. A mold temperature control device for controlling the temperature of a mold for performing resin molding provided in the molding machine;
A manifold interposed between the mold temperature controller and the mold,
An automatic opening / closing valve provided in a cooling medium supply pipe for supplying a cooling medium from the manifold to the mold;
Control means for cooling the mold by supplying a cooling medium by a delayed opening / closing control delayed by a predetermined time from the mold closing time to the automatic opening / closing valve based on a mold closing signal generated at the time of closing the mold;
A mold temperature control system including a mold temperature control mechanism.

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