JP2000238055A - Automatic feeding method of main agent and/or additive and feeding device thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To manufacture a molding, the quality of which is stable, without lowering its productivity by a method wherein the supplying amounts of a main agent and/or an additive are automatically changed in response to the change of the measured temperature of the surface of a mold. SOLUTION: A surface temperature measured with a temperature sensor 2 is converted to an electric signal, which is received by a conversion unit 31 in a sequencer 3 connected with the sensor 2 by converting an AC to a DC, so as to issue a command in an electric signal by means of an output unit 33 on the basis of a built-in indicating program 32 in order to actuate a constant volume pump 4 with an inverter motor. Next, through an additive supplying hose 51 connected to the constant volume pump 4 with the inverter motor, the amount, which is determined on the basis of the indicating program 32 of an additive is fed to a spray gun 5 so as to blast the additive together with the main agent against a mold 1 through the air plenum 53 of the spray gun 5. Thus the supplying amount of the additive can be adjusted in response to the change of the surface temperature of the mold 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of spraying a base material and an additive onto a molding die, for example, an FRP such as a bathtub.
The present invention relates to a method and an apparatus for automatically supplying a main agent and / or an additive used for producing a molded article.

[0002]

2. Description of the Related Art Conventionally, as a method for supplying a main agent and / or an additive and an apparatus for supplying the same, an additive supply method and a supply used in a reinforcing fiber cutting apparatus described in Japanese Patent Application Laid-Open No. 2-190313 are disclosed. Devices are known. This automatic additive feeder is a chop (short fiber) obtained by cutting a reinforcing fiber short.
A molding resin (base resin) nozzle is provided immediately below the chute from which the resin falls, and a curing agent (additive) is provided immediately below the base resin nozzle.
A nozzle is provided.

[0003] A method of automatically supplying an additive using this supply device is such that a molding resin is sprayed from the tip of a main material nozzle, a chop is formed from above the molding resin, and an additive nozzle is formed below the resin. Further, the additive is jetted out, and the injected molding resin entrains the chop and the additive and is sprayed on the molding die. In this method, the above steps can be sequentially performed by automatic operation,
It is simple.

[0004]

However, in the additive supply method and the additive supply apparatus described above, the amount of the additive supplied is increased or decreased in response to a rapid change in the surface temperature of the molding die, thereby shortening the curing time. Since the adjustment is not performed, it is extremely difficult to stabilize the manufacturing conditions by adjusting the curing time, and there is a problem that poor curing occurs. Therefore, an object of the present invention is to adjust the supply amount of a main agent and / or an additive in response to a change in the surface temperature of a molding die, and to form a main agent capable of creating stable production conditions, and And / or a method for automatically supplying an additive and a device for supplying the same.

[0005]

SUMMARY OF THE INVENTION The present invention has been made to achieve the above object, and the invention according to claim 1 has the following features.
In the method of automatically supplying the main agent and / or additive when the main agent and the additive are sprayed on the molding die to produce a molded article, the surface temperature of the molding die is measured, and the temperature change of the surface temperature is measured. Correspondingly, the supply amount of the main agent and / or the additive can be automatically changed.

According to a second aspect of the present invention, a surface temperature of a molding die is provided on an upper portion of a molding die to which a main agent and an additive are sprayed, and the measured surface temperature is processed into an electric signal. A temperature sensor capable of receiving the electric signal from this temperature sensor, and a sequencer that can operate a metering pump with an inverter motor based on the program built in with this electric signal, and operate according to the instructions of the program in the sequencer. The valve is selected, opened and closed, the rotation speed of the inverter motor changes,
And / or a metering pump with an inverter motor capable of changing the supply amount of the additive, and a spray gun provided at the tip of the metering pump with the inverter motor.

The main agent in the present invention refers to a chop (short fiber) obtained by cutting a molding resin and a reinforcing fiber into short pieces. Examples of the molding resin include a thermosetting resin such as a polyester resin and a standard product. , A resin containing a retarder and a resin containing a promoter. The additive refers to a curing agent used to cure the molding resin.

[0008] The molding die in the present invention is a mold capable of spraying a main agent and an additive to cure the main agent to produce various products.
If the product can be easily removed from the molding die, any suitable material may be used, such as metal, synthetic resin, and wood.
Further, a release agent may be applied to the surface of the molding die so that the product is more easily peeled off than the molding die.

In the invention according to claim 2, the temperature sensor may be an appropriate one as long as it can measure the surface temperature of the molding die from a certain distance and can convert the measured surface temperature into an electric signal. For example, a radiation temperature type is good.

[0010] In the invention according to claim 2, the sequencer receives an electric signal from the temperature sensor, and if the sequencer can operate the metering pump with the inverter motor based on a program stored in the electric signal, the sequencer is appropriate. For example, an AC-DC conversion unit, an instruction program, and an output unit may be used.

In the second aspect of the present invention, the operating valve may be any suitable one as long as the operating valve can be selected and opened and closed by instructions of a program in the sequencer. Product, a resin containing a retarder, a resin containing a promoter), a normal operation valve that can select a valve, open and close, and supply a molding resin according to a program instruction in the sequencer.

In the invention according to the second aspect, the metering pump with an inverter motor can change the number of revolutions and change the supply amount of the main agent and / or the additive according to instructions of a program in the sequencer. Any suitable one may be used, for example, one composed of an inverter motor and a fixed-quantity diaphragm pump.

[0013] In the invention according to claim 2, the spray gun is connected to a metering pump with an inverter motor, and can be any suitable one as long as the additive can be sprayed together with the base material onto the molding die. The main supply hose and the additive supply hose from the metering pump may be connected to one end and an outlet may be provided at the other end.

According to the first aspect of the present invention, the surface temperature of the molding die is measured, and the supply amount of the main agent and / or the additive is automatically adjusted in accordance with the temperature change of the surface temperature. Since it can be changed, the supply amount of the base material and / or the additive can be adjusted according to the surface temperature change of the molding die, and the surface temperature of the molding die becomes low. When the surface temperature is high, when the surface temperature is high, the main agent,
And / or reducing the supply amount of the additive and minimizing the variation in the curing time, and thereby making stable production conditions.

According to the second aspect of the present invention, the temperature sensor is provided on the upper part of the molding die to which the main agent and the additive are sprayed, and the temperature sensor and the sequencer are connected.
The temperature sensor can measure the surface temperature of the molding die, process the measured surface temperature into an electric signal, and send the electric signal to a sequencer.

A sequencer is connected to the temperature sensor, a metering pump with an inverter motor is connected to the sequencer, and a spray gun is connected to the tip of the metering pump with the inverter motor. Is received by the sequencer's AC to DC conversion unit, and based on the instruction program built in the sequencer, an instruction is issued from the output unit with this electric signal, and the metering pump with an inverter motor connected to the output unit is operated. In accordance with the surface temperature change, three types of molding resins (standard product, resin containing a retarder, resin containing a promoter) can be selected and supplied, and an appropriate amount of a main agent and / or an additive can be added. It can supply and produce stable manufacturing conditions.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below in detail with reference to FIG. FIG. 1 is a schematic explanatory view of an automatic additive supply device.

In FIG. 1, A is an automatic additive supply device.
, A temperature sensor 2, a sequencer 3, a metering pump 4 with an inverter motor, a spray gun 5, and a storage tank (not shown). Mold 1
Has an oval cross section in the horizontal direction and a height of about 60 c.
It is placed on a support with a bathtub of m. The temperature sensor 2 is attached to a point approximately 1 m above the molding die 1 with a radiation thermometer (model IR-BT1, manufactured by Chino Corporation), and measures the surface temperature of the molding die 1. The surface temperature is converted into an electric signal and sent to the connected sequencer 3.

The sequencer 3 is a sequencer (model A
68AD, manufactured by Mitsubishi Electric Corporation), which comprises an AC to DC conversion unit 31, an instruction program 32, and an output unit 33. The AC to DC conversion unit 31 receives an electric signal from the temperature sensor 2. Based on a built-in instruction program 32, an instruction is issued from the output unit 33 with this electric signal, and the metering pump 4 with an inverter motor connected to the output unit 33 is operated. The instruction program 32 is, as shown in Table 1, a relation among the surface temperature of the molding die 1, the electric signal, the rotation speed of the inverter motor, the discharge amount of the additive, and the curing time. It is shown.

[0020]

[Table 1]

Metering pump 4 with inverter motor
Is the inverter motor 41 (model J100-004)
LF, manufactured by Hitachi, Ltd.) and a fixed-quantity diaphragm pump 42 (model SYMW, manufactured by Takumina Co., Ltd.), and an inverter motor 41 is connected to the output unit 33.

The spray gun 5 is connected at one end to an additive supply hose 51, a molding resin supply hose 52, and a chop 54 obtained by cutting a reinforcing fiber into a short length.
Is provided, and the additive supply hose 51 is connected to the fixed-quantity diaphragm pump 42.

The operation will be described while explaining the method of using the automatic additive supply device A of the present invention. First, the support 11
The molding die 1 is placed thereon, and the surface temperature of the molding die 1 is measured by a temperature sensor 2 (radiation thermometer). Next, the surface temperature measured by the temperature sensor 2 is converted into an electric signal, which is received by an AC-to-DC conversion unit 31 of the connected sequencer 3, and is converted into an electric signal based on a built-in instruction program 32. An instruction is issued from the output unit 33 to operate the metering pump 4 with an inverter motor.

Next, an amount of additive determined based on the instruction program 32 shown in Table 1 is sent to the spray gun 5 through an additive supply hose 51 connected to the metering pump 4 with an inverter motor. (A chop obtained by cutting the molding resin and the reinforcing fiber into short pieces) and spraying the molding die 1 from the outlet 53 of the spray gun 5.

In this manner, the surface temperature of the molding die 1 is measured, and the supply amount of the additive can be automatically changed according to the temperature change of the surface temperature. The supply amount of the additive can be adjusted according to the surface temperature change of the mold 1. When the surface temperature of the molding die 1 is low, the additive amount is increased and the surface temperature becomes high. In this case, it is possible to reduce the amount of the additive and minimize the variation in the curing time, thereby making stable production conditions.

Next, experimental data are shown in Table 2 in order to explain the features of the present invention. That is, in Table 2, Example 1
And Comparative Example 1 are as follows. (Example 1) 500 automatic additive supply devices A of the present invention (corresponding to the temperature change of the surface temperature of the molding die 1,
After automatically passing through an oven set at 60 ° for 20 minutes, the degree of cure and poor cure were observed by finger touch. The degree of curing is obtained by dividing the number into three, namely, the number of insufficient curing, the dryness to the touch, and the over-curing, and the number is examined. It should be noted that touch dryness means that a fingerprint is left when touched.

(Comparative Example 1) 500 conventional automatic additive supply devices (conventional ones, which were operated without changing the supply amount of the additive in response to the change in the surface temperature of the molding die). And the furnace is set to 20 °
After passing through for a minute, the degree of curing and poor curing were observed by finger touch.
The degree of curing is obtained by dividing the number into three, namely, the number of insufficient curing, the dryness to the touch, and the over-curing, and the number is examined.

[0028]

[Table 2]

As shown in Table 2, in Example 1, the degree of cure was 94% for dry touch, the number of undercured and overcured was 6%, and the number of defective cured was 0. In Comparative Example 1, the degree of cure was 70% for dry to the touch, the number of undercured and slightly overcured was 30%, and the number of defective cured was 2.

Next, another embodiment of the present invention will be described in detail with reference to FIG. FIG. 2 is a schematic explanatory view of an automatic supply device of a main component and an additive.

When the structure of the other embodiment is compared with the structure of the embodiment of FIG. 1, as shown in FIG. 2, the difference is that the supply amount of the main agent can be changed. The point in which the supply amount is also changed is almost the same as in the embodiment of FIG.

In FIG. 2, B is an automatic supply device for the main agent and the additive.
A molding die 1, a temperature sensor 2, a sequencer 3,
It comprises a metering pump 4 with an inverter motor for the main agent and additives, a spray gun 5, an operating valve 6, and a storage tank 7.

The molding die 1, the temperature sensor 2, and the sequencer 3 are the same as those of the embodiment shown in FIG. The instruction program 32 of the sequencer 3 includes, as shown in Table 3, the surface temperature of the molding die 1, the electric signal, the rotation speed of the inverter motor, the discharge amount of the additive, and the curing time. It shows the relationship with.

[0034]

[Table 3]

Metering pump 4 with inverter motor
Is a metering pump 4a with an inverter motor for the base agent,
4b and 4c and a metering pump 4d with an inverter motor for additives. The metering pump 4a with the inverter motor for the base agent is an inverter motor 41
a, 41b, 41c (all models J100-004L
F, manufactured by Hitachi, Ltd.) and fixed-quantity diaphragm pumps 42a, 42b, 42c (all are model SYMW, manufactured by Takumina Corporation).

The operating valve 6 includes an operating valve 6a for a standard resin for molding resin, an operating valve 6b for a resin containing a retarder of the molding resin, and an operating valve for a resin containing an accelerator of the molding resin. 6c.

The storage tank 7 includes a storage tank 7a for a standard resin of the molding resin, a storage tank 7b for a resin containing a retarder of the molding resin, and a storage tank for a resin containing a promoter of the molding resin. 7c.

Inverter motors 41a, 41b, 4
1c is connected to the output unit 33 of the sequencer 3,
Based on the instruction program 32, the fixed-quantity diaphragm pumps 42a, 42b, 42c are operated.

One end of the metering diaphragm pump 42a is connected to a storage tank 7a for a standard product of molding resin, and the other end is connected to an operating valve 6a. One end of the fixed-diameter diaphragm pump 42b is connected to a storage tank 7b for a resin containing a retarder containing a molding resin, and the other end is connected to an operating valve 6b.
Is connected to One end of the fixed-quantity diaphragm pump 42c is connected to a storage tank 7 for resin containing a molding resin accelerator.
c, and the other end is connected to an operating valve 6c.

The metering pump 4d with an inverter motor for additives is equipped with an inverter motor 41d (model J10).
0-004LF, manufactured by Hitachi, Ltd.) and a fixed-quantity diaphragm pump 42d (model SYMW, manufactured by Takumina Corporation). This inverter motor 41
“d” is connected to the output unit 33 of the sequencer 3. The metering diaphragm pump 42d is connected to the additive storage tank 7d.

The spray gun 5 is connected at one end to an additive supply hose 51, a molding resin supply hose 52, and a chop 54 obtained by cutting a reinforcing fiber into a short length.
Is provided. The additive supply hose 51 is connected to the constant-quantity diaphragm pump 42d, and the molding resin supply hose 5
2 is an operation valve 6a for a standard resin of molding resin, an operation valve 6b for a resin containing a retarder of the molding resin,
It is connected to an operation valve 6c for a resin in which an accelerator for a molding resin is mixed.

The operation will be described while explaining the method of using the automatic supply apparatus B for the main agent and the additive of the present invention. First, the mold 1 is placed on the support 11 and the surface temperature of the mold 1 is measured by the temperature sensor 2 (radiation thermometer). Next, the surface temperature measured by the temperature sensor 2 is converted into an electric signal, which is received by an AC-to-DC conversion unit 31 of the connected sequencer 3 and has a built-in instruction program 32.
Is output from the output unit 33 in the form of an electric signal.

At this time, if the surface temperature of the molding die 1 is 40 ° C. or higher, the operator selects the operating valve 6b, activates the inverter motor 41b and the fixed-quantity diaphragm pump 42b, and removes the resin containing the retarder containing the molding agent. Supply hose 52
To the spray gun 5 and the additive supply hose 5 connected to the metering pump 4d with an inverter motor.
1 to the spray gun 5, the amount of the additive determined based on the instruction program 32 shown in Table 3 is sent to the spray gun 5, and combined with the main agent (a chop obtained by cutting the molding resin and the reinforcing fiber into short pieces). It is sprayed onto the molding die 1 from the outlet 53.

When the surface temperature of the molding die 1 is 10 ° to 40 °, the operating valve 6a is selected, and the inverter motor 41a and the fixed-quantity diaphragm pump 42a are operated to supply the resin containing the molding compound with a retarder. Through the additive supply hose 51 connected to the metering pump 4d with an inverter motor, and the additive amount determined based on the instruction program 32 shown in Table 3 to the spray gun 5. Then, it is sprayed on the molding die 1 from the outlet 53 of the spray gun 5 together with the main agent (a chop obtained by cutting the molding resin and the reinforcing fiber into short lengths).

When the surface temperature of the molding die 1 is 10 ° C. or less, the operating valve 6c is selected, and the inverter motor 41c and the fixed-quantity diaphragm pump 42c are operated to supply the resin containing the molding material with a retarder. Through the additive supply hose 51 connected to the metering pump 4d with an inverter motor, and the amount of additive determined based on the instruction program 32 shown in Table 3 to the spray gun 5. Then, it is sprayed on the molding die 1 from the outlet 53 of the spray gun 5 together with the main agent (a chop obtained by cutting the molding resin and the reinforcing fiber into short lengths).

In this manner, the surface temperature of the molding die 1 is measured, and the supply amount of the base material and / or the additive can be automatically changed in accordance with the change in the surface temperature. Therefore, the supply amount of the main agent and / or the additive can be adjusted in accordance with the surface temperature change of the molding die 1, and when the surface temperature of the molding die 1 is low, When the surface temperature is high, increase the amount of the main agent and / or additive, and reduce the amount of the main agent and / or additive to minimize the variation in the curing time to achieve stable production conditions. Can be made.

Next, experimental data are shown in Table 4 in order to explain the features of the present invention. That is, in Table 4, Example 1
And Comparative Examples 1 and 2 are as follows. (Example 1) 500 automatic supply devices B of the main agent and the additive of the product of the present invention (the supply amounts of the main agent and the additive were automatically changed according to the temperature change of the surface temperature of the molding die 1). After passing through the furnace set at 60 ° for 20 minutes,
The degree of cure and poor cure were observed by finger touch. The degree of curing is obtained by dividing the number into three, namely, the number of insufficient curing, the dryness to the touch, and the over-curing, and the number is examined. It should be noted that touch dryness means that a fingerprint is left when touched.

(Comparative Example 1) 500 prior art additive automatic supply devices (conventional ones, which were carried out without changing the supply amount of the additive in accordance with the temperature change of the surface temperature of the molding die. And after passing through a 60 ° setting furnace for 20 minutes, the degree of cure and poor cure were observed by finger touch. The degree of curing is obtained by dividing the number into three, namely, the number of insufficient curing, the dryness to the touch, and the over-curing, and the number is examined.

(Comparative Example 2) Example 1 at the time of one example, in which 500 automatic additive supply devices A of the present invention (corresponding to the temperature change of the surface temperature of the molding die 1, (With the additive supply automatically changed) and run at 60 °
After passing through the setting furnace for 20 minutes, the curing degree and the curing failure were observed by finger touch. The degree of curing is obtained by dividing the number into three, namely, the number of insufficient curing, the dryness to the touch, and the over-curing, and the number is examined.

[0050]

[Table 4]

As shown in Table 4, in Example 1, the degree of cure was 98% for dry to the touch, the number of undercured and slightly overcured was 2%, and the number of poorly cured was 0. In Comparative Example 1, the degree of cure was 70% for dry to the touch, the number of undercured and slightly overcured was 30%, and the degree of poor curing was 2. In Comparative Example 2, the degree of cure was 94% dry to the touch,
The number of undercuring and the overcuring tendency were 6%, and the number of poor curing was 0.

Although the embodiment of the present invention has been described in detail with reference to the drawings, the specific configuration is not limited to this embodiment, and even if there is a design change or the like without departing from the gist of the present invention. Included in the present invention.

[0053]

As described above, in the present invention, according to the first aspect of the present invention, the surface temperature of the molding die is measured, and the main agent and / or Alternatively, since the supply amount of the additive can be automatically changed, it is possible to adjust the supply amount of the main agent and / or the additive in response to a change in the surface temperature of the molding die. When the surface temperature of the molding die is low, the supply amount of the main agent and / or additive is increased, and when the surface temperature is high, the supply of the main agent and / or additive is The amount can be reduced and the variation in the curing time can be minimized, and stable manufacturing conditions can be created. As a result, a molded product having stable quality can be manufactured without lowering the productivity.

According to the second aspect of the present invention, the temperature sensor is provided on the upper part of the molding die to which the main agent and the additive are sprayed, and the temperature sensor and the sequencer are connected.
The temperature sensor can measure the surface temperature of the molding die, process the measured surface temperature into an electric signal, and send the electric signal to a sequencer.

A sequencer is connected to the temperature sensor, a metering pump with an inverter motor is connected to the sequencer, and a spray gun is connected to the tip of the metering pump with the inverter motor. Is received by the sequencer's AC to DC conversion unit, and based on the instruction program built in the sequencer, an instruction is issued from the output unit with this electric signal, and the metering pump with an inverter motor connected to the output unit is operated. In accordance with the surface temperature change, three types of molding resins (standard product, resin containing a retarder, resin containing a promoter) can be selected and supplied, and an appropriate amount of a main agent and / or an additive can be added. It can supply and produce stable manufacturing conditions.
As a result, a molded product having stable quality can be manufactured without lowering the productivity.

[Brief description of the drawings]

FIG. 1 shows an embodiment of the present invention, and is a schematic explanatory view of an automatic additive supply apparatus.

FIG. 2 shows another embodiment of the present invention, and is a schematic explanatory view of an automatic supply device for a main agent and an additive.

[Explanation of symbols]

A automatic supply device for additive B automatic supply device for main agent and additive 1 molding die 11 support base 2 temperature sensor 3 sequencer 31 conversion unit 32 instruction program 33 output unit 4, 4a, 4b, 4c, 4d Fixed quantity with inverter motor Pumps 41a, 41b, 41c, 41d Inverter motors 42a, 42b, 42c, 42d Diaphragm pump 5 Spray gun 51 Additive supply hose 52 Molding resin supply hose 53 Blow-out port 54 Chop (reinforcing short fiber) supply hose 6a, 6b, 6c Operate valve 7a, 7b, 7c, 7d Storage tank

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 4F205 AA36 AA41 AB03 AB25 AH49 AL16 AP05 AQ03 AR06 AR09 AR14 GA05 GB01 GC04 GF01 GF02 GF23 GF25 GF48 GN25 GN28 HA04 HA24 HA33 HA36 HA47 HB01 HC04 HF01 HF02 HF05 HK02 HF05 HK02 HF05 HK05 HM05

Claims (2)

[Claims] In a method of automatically supplying a main agent and / or an additive when manufacturing a molded product by spraying a main agent and an additive on a molding die, a surface temperature of the molding die is measured. A main agent characterized in that the supply amount of the main agent and / or the additive can be automatically changed in accordance with the temperature change of the surface temperature;
And / or a method for automatically supplying additives. 2. A method for measuring the surface temperature of a molding die, which is provided on an upper portion of a molding die to which a main agent and an additive are sprayed,
A temperature sensor that can process the measured surface temperature into an electric signal, and receives an electric signal from this temperature sensor, and operates an operating valve and a metering pump with an inverter motor based on a program embedded with the electric signal. A sequencer that can be operated, and an operation valve that selects and opens and closes, an inverter motor that changes the number of revolutions of the inverter motor, and can change the supply amount of the main agent and / or additive by the instructions of the program in the sequencer An automatic supply device for a main agent and / or an additive, comprising: a metering pump with an inverter; and a spray gun provided at the tip of the metering pump with an inverter.