JP2007144662A - Manufacturing apparatus and manufacturing method for resin molded product - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a manufacturing apparatus for a resin molded product capable of suppressing the occurrence of defectiveness such as the shape irregularity of the molded product, the occurrence of non-filling, burr and air bubbles, etc., even when use is made of a resin material having a viscosity varying depending on its temperature, and the manufacturing method for the resin molded product. <P>SOLUTION: In the manufacturing apparatus of the resin molded product, a third temperature conditioning means (heater) for controlling the viscosity of a resin material by performing the regulation of the temperature of the resin material to the third temperature of the value between a first temperature (cavity heating temperature) and a second temperature (cooling part cooling temperature) is added the part on the side of the cavity from the part (cooling part where the second temperature) conditioning means in the sprue being the flow passage of the resin material. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a resin molded body manufacturing apparatus and manufacturing method, and particularly to a resin material temperature control technique in a cold runner system.

  Currently, resin molded bodies are used in various applications. An injection molding apparatus is used for manufacturing the resin molded body. The injection molding apparatus includes an injection unit that injects a resin material, a molding die that receives the injected resin material, and functional units that are attached thereto. In such an injection molding apparatus, when a two-component thermosetting resin is used as the material, the resin material in the resin material flow path (sprue) is cured by the heat supplied for the material curing. In order to prevent this, a so-called cold runner system to which a function of cooling the sprue is added is employed (for example, Patent Document 1).

The structure of the mold in the injection molding apparatus that employs the cold runner system will be described with reference to FIG.
As shown in FIG. 5, the mold in the injection molding apparatus is configured with a combination of a movable mold 510 and a fixed mold 520. The fixed die 520 is formed with a sprue 521 extending toward the joint portion with the movable die 510, and the nozzle of the injection portion is attached to the gate portion 521a of the sprue 521. A cooling fluid channel 522 for cooling the resin material in the sprue 521 is formed in the peripheral portion of the sprue 521. A coolant supply unit 560 is connected to the coolant flow path 522.

  A cavity 511 and a runner 512 are formed at the joint portion of the fixed mold 520 and the movable mold 510 in a state where the flow path is connected to the sprue 521 in the fixed mold 520. A sprue lock 513 is formed at a connection portion between the sprue 521 and the runner 512. A gate is formed at the boundary between the cavity 511 and the runner 512 (not shown in FIG. 5).

In each of the movable mold 510 and the fixed mold 520, heaters 514 and 524 are embedded in regions corresponding to the cavities 511, and heater power sources 540 and 545 are connected to the heaters 514 and 524, respectively.
A heat insulating part 523 is provided between the coolant supply flow path 522 and the heater 524 in the fixed mold 520, and the heat of the heaters 514 and 524 that heat the cavity 511 is used to cool the fixed mold 520. The cooling liquid flowing through the liquid supply path 522 is not taken away.

  In the conventional injection molding apparatus having the above-described structure, a thermosetting resin material is supplied from the gate portion 521a, and the supplied resin material is filled into the cavity 511 through the sprue 521 and the runner 512. The resin material filled in the cavity 511 is cured by receiving heat supply from the heaters 514 and 524. Here, the resin material in the cavity 511 is cured by being heated for a certain period of time, but if the cooling function is not added to the fixed mold 520 at this time, the resin from the heaters 514 and 524 The resin material in the sprue 521 also rises in temperature due to heat, and even the resin material to be used in the next shot is cured.

In the technique of Patent Document 1, in order to solve such a problem, a coolant flow path 522 is provided in a peripheral region of the sprue 521 so that the resin material in the sprue 521 is not cured.
Japanese Patent No. 2612795

  However, in the case where the two-component mixed thermosetting resin material cooled by the sprue 521 is filled into the cavity 511 heated by the heaters 514 and 524, the temperature of the resin material rises rapidly, and its viscosity also increases. It changes rapidly. For this reason, when molding is performed using a conventional injection molding apparatus as shown in FIG. 5, shape variations, burrs, bubbles, and the like occur in the molded product due to a rapid change in viscosity of the resin material during filling. Sometimes.

  Specifically, the thermosetting resin material mixed with two liquids has a region where the viscosity temporarily decreases to about 1/10 of around room temperature at 50 to 150 (° C.), and in a region higher than this, The viscosity rises rapidly with increasing temperature. Further, the two-component mixed thermosetting resin material starts to be cured even at around room temperature. From these matters, in the case of performing molding using the above resin material with a conventional injection molding apparatus, the resin material cooled to a temperature lower than normal temperature by the sprue 521 is filled in the cavity 511 of the movable mold 510. Or when passing through the runner 512, the viscosity becomes the lowest, and then the viscosity rises rapidly. Therefore, the conventional injection molding apparatus may cause the above-described problems.

  The present invention has been made to solve the above-described problems, and even when a resin material whose viscosity changes according to temperature is used, the shape of the molded body is not uniform, unfilled, burrs, and bubbles. It aims at providing the manufacturing apparatus and manufacturing method of a resin molding which can suppress generation | occurrence | production of defects, such as generation | occurrence | production.

In order to achieve the above object, the present invention adopts the following configuration.
The resin molded body manufacturing apparatus according to the present invention has a mold in which a cavity and a flow path of the resin material connected to the cavity are formed, and the temperature of the resin material inside the cavity is cured in a region near the cavity. First temperature adjusting means for adjusting the first temperature to be promoted is provided, and in the vicinity region on the upstream side of the resin flow in the flow path, the temperature of the resin material in the flow path in the portion is suppressed from being cured. The second temperature adjusting means for adjusting the temperature to two temperatures is provided, and the resin material in the distribution path in the part is located in a region near the downstream side of the resin distribution from the part where the second temperature adjustment means in the distribution path is provided. Third temperature adjusting means for adjusting the temperature to the third temperature is provided, and the third temperature is set to a value between the first temperature and the second temperature, based on the temperature-viscosity characteristics of the resin material. Have The features.

The method for producing a resin molded body according to the present invention includes the following steps (1) to (4).
(1) Filling step: A resin material is filled from the opening end of the flow path into the cavity in the mold in which the cavity and the flow path connected to the cavity are formed.
(2) First temperature adjustment step: While maintaining the state where the cavity is filled with the resin material, the temperature of the filled resin material is adjusted to the first temperature at which curing is promoted.
(3) Second temperature adjustment step: The temperature of the resin material inside a part of the flow path is adjusted to a second temperature at which curing is suppressed.
(4) Third temperature adjustment step: The second temperature adjustment step is performed when filling the resin material inside the portion adjusted to the second temperature in the second temperature adjustment step into the cavity adjusted to the first temperature. The temperature of the resin material inside the part of the flow path that is the target of the temperature adjustment and the cavity between the part and the cavity is set to a value between the first temperature and the second temperature. The temperature is adjusted to 3 at that temperature.

  In the resin molded body manufacturing apparatus according to the present invention, as described above, the downstream side of the resin flow, that is, the flow of the resin material with respect to the portion where the second temperature control means in the flow path of the resin material is provided in the vicinity region. A third temperature adjusting means for adjusting the temperature of the resin material in the resin path corresponding to the portion to the third temperature in the vicinity of the cavity side in the path, thereby adjusting the viscosity of the resin material in the portion. It has the structure provided. The third temperature described above is based on the temperature-viscosity characteristics of the resin material used for molding, as well as the first temperature (temperature at which curing of the resin material in the cavity is promoted) and the second temperature (upstream of the resin path). At a temperature at which curing of the resin material is suppressed). By having such a configuration, in the resin molded body manufacturing apparatus according to the present invention, it is possible to adjust the temperature of the resin material on the downstream side of the distribution path to the third temperature that takes the above value, and to the cavity The viscosity of the resin material during filling can be optimized.

  For example, in the conventional resin molded body manufacturing apparatus shown in FIG. 5, as described above, the resin material that has been cooled by the sprue 521 in order to suppress curing is directed toward the cavity 511 that is heated to accelerate curing. As it progresses, its temperature rises rapidly and its viscosity changes rapidly. For this reason, it is difficult to control the viscosity of the resin material when filling the cavity 511 in the manufacture of a resin molded body using the conventional resin molded body manufacturing apparatus. In particular, the viscosity of the resin material when the cavity 511 is filled is also greatly affected by, for example, lot-to-lot variations of the resin material, and the occurrence of variations in the shape of the molded body, unfilled, burrs, bubbles, etc. is effectively prevented. Could not be suppressed.

  In contrast, in the resin molded body manufacturing apparatus according to the present invention, the temperature-viscosity characteristics of the resin material to be used are not directly filled in the cavity with the resin material adjusted to the second temperature in order to suppress curing. In addition, the temperature of the resin material can be adjusted to a third temperature which is a value between the first temperature and the second temperature by using the third temperature adjusting means, so that the viscosity of the resin material is optimally set when filling the cavity. It is possible to set.

Therefore, the resin molded body manufacturing apparatus according to the present invention has a defective shape such as variation in the shape of the molded body, unfilled, burrs, and bubbles even when a resin material whose viscosity changes with temperature is used. Can be suppressed.
Moreover, in the manufacturing method of the resin molding which concerns on this invention, it has a 3rd temperature control step, the temperature of the resin material with which a cavity is filled is made into 1st temperature for hardening acceleration, and 2nd temperature for effect suppression Since the temperature can be set to the third temperature, the viscosity of the resin material when filling the cavity can be controlled to the optimum value as described in the resin molded body manufacturing apparatus according to the present invention. It is.

Therefore, in the method for producing a resin molded body according to the present invention, even when a resin material whose viscosity changes according to temperature is used, the shape of the molded body is not uniform, unfilled, burrs, and bubbles are generated. The occurrence of defects can be suppressed, and the yield and quality can be improved.
In the apparatus and method for producing a resin molded body according to the present invention, the following variations can be employed.

  In the apparatus and method for producing a resin molded body according to the present invention, the first temperature adjusting means (first temperature adjusting step in the manufacturing method) and the second temperature adjusting means (second in the manufacturing method) Therefore, it is possible to target a thermosetting resin material. That is, by providing both temperature control means (both temperature control steps), it is possible to suppress the curing of the resin material in the sprue while promoting the curing of the resin material in the cavity. It is superior from the viewpoint of quality.

  Moreover, in the manufacturing apparatus and manufacturing method of the resin molding which concerns on this invention, the resin material in which the 4th temperature from which the viscosity becomes the minimum exists between 1st temperature and 2nd temperature in a temperature-viscosity characteristic is used. This is particularly advantageous when targeted. That is, when such a resin material is molded using the above-described conventional manufacturing apparatus shown in FIG. 5, when the resin material cooled by the sprue is introduced into the cavity, the temperature rises. Once the viscosity decreases, defects such as variation in the shape of the molded article, unfilled, burrs and bubbles may occur.

  On the other hand, in the manufacturing apparatus and manufacturing method of the resin molded body according to the present invention, the viscosity of the resin material introduced into the cavity by the third temperature adjusting means (the third temperature adjusting step in the manufacturing method). Optimization can be performed. For this reason, when the manufacturing apparatus and manufacturing method of the resin molding which concern on this invention are used, 3rd temperature is made into 4th temperature and 1st temperature also with respect to the resin material which has the said temperature-viscosity characteristic. By setting in between, each defect as described above can be reduced. Among them, it is advantageous when using a resin material in which two liquids of a main agent and a curing agent are mixed.

  Moreover, in the manufacturing apparatus of the resin molding which concerns on this invention, in the shaping | molding die, between the execution part of the 1st temperature control means and the execution part of the 3rd temperature control means, and the execution part of the 3rd temperature control means If the structure which interposed the heat insulation part which suppresses the distribution | circulation of the heat | fever between each is employ | adopted between each with the execution part of a 2nd temperature control means, the temperature of a cavity will be 2nd temperature control means and 3rd temperature. It is less susceptible to thermal effects due to temperature control such as adjusting means, can stably maintain the temperature of the cavity for curing, and has an advantage from the viewpoint of product quality. In addition, by interposing the heat insulating portion in this way, heat applied to the apparatus is not wasted, which is advantageous from the viewpoint of energy efficiency.

In the above, “the execution section in each means” means, for example, a flow path of a thermal fluid such as a heater or steam in the case of heating, and a flow path of a coolant in the case of cooling. It means the endothermic part in.
Moreover, in the apparatus for producing a resin molded body according to the present invention, data relating to the temperature-viscosity characteristics corresponding to the resin material to be applied to the first temperature adjusting means, the second temperature adjusting means, and the third temperature adjusting means. If the thermal control unit provided in advance is connected, it is not necessary for the operator to reset the temperature setting of each part every time the resin material is changed, and superiority and unnecessary in terms of time efficiency during manufacturing It is advantageous in that it is possible to eliminate a temperature setting error.

The best mode for carrying out the present invention will be described below with reference to the drawings. In addition, about each embodiment used in the following description, it is assumed as an example for easy understanding of the configuration and operation of the manufacturing apparatus and manufacturing method of the resin molded body according to the present invention. You are not limited to these.
1. Apparatus Configuration The resin molded body manufacturing apparatus 1 according to the embodiment of the present invention uses a two-component mixed thermosetting resin material as its material. The main part of the configuration will be described with reference to FIG. FIG. 1 is a schematic cross-sectional view mainly illustrating portions related to the molds 10 and 20 in the configuration of the resin molded body manufacturing apparatus 1.

As shown in FIG. 1, the resin molded body manufacturing apparatus 1 according to the present embodiment mainly includes a movable mold 10, a fixed mold 20, an injection unit 30, and the like. Although not shown in FIG. 1, a control unit that is connected to each functional part and outputs a drive signal to each functional part is provided.
The injection unit 30 is a screw type extruder, and includes a cylinder 31 and a screw 32 inserted therein. Further, the injection unit 30 has a valve pin 33 near the connection portion with the fixed mold 20. The valve pin 33 is provided to execute quantitative control of filling of the resin material from the injection unit 30 to the molds 10 and 20. The injection unit 30 is provided with a backflow prevention valve in a part of the gap between the cylinder 31 and the screw 32, but the illustration thereof is omitted in FIG. Further, the other end of the screw 32 is provided with a motor as a rotational power source.

  The movable die 10 is provided with a plurality of cavities 101 (two locations in FIG. 1) having a molding shape or a shape similar to the molding shape at a boundary portion with the fixed die 20, and the heaters 111 corresponding to each. , 214 are embedded in each of the movable mold 10 and the fixed mold 20. Heater power supplies 40 and 45 are connected to the heaters 111 and 214, respectively. The two cavities 101 are connected by a runner 102, and a trapezoidal sprue lock 103 is formed at the center.

In the resin molded body manufacturing apparatus 1 according to the present embodiment, each combination of the heaters 111 and 214 and the heater power sources 40 and 45 serves as a heating unit for the resin material filled in the cavity 101. Among them, the heaters 111 and 214 are execution portions of the heating means for the cavity 101.
Further, a flange 10a is formed on the outer periphery of the movable mold 10, and a cylinder 50 arranged so as to be able to stroke in the X-axis direction in FIG. 1 is joined thereto. The cylinder 50 is an air cylinder, but a combination of a hydraulic cylinder, a motor, and a ball screw can also be applied. Further, a protrusion 10 b having a shape that fits with the protrusion 20 a of the fixed mold 20 is formed on the outer periphery of the movable mold 10.

A sprue 201 extending in the X-axis direction in FIG. 1 is formed on the inner side of the fixed die 20 so as to connect the resin injection port of the injection portion 30 to the central portion of the runner 101 at the boundary portion with the movable die 20. Yes. The sprue 201 serves as a flow path FLOW _R for the resin material injected from the injection unit 30. The fixed mold 20 is divided into three parts in the X-axis direction of FIG. In the portion located on the right side in the X-axis direction, a coolant flow path 202 that is a path of the coolant flow FLOW _C is formed close to the sprue 201. The coolant channel 202 is connected to the coolant supply unit 60. In the resin molded body manufacturing apparatus 1 according to the present embodiment, the combination of the coolant flow path 202 and the coolant supply unit 60 is used to perform cooling of the resin material in the part (cooling unit 201a). It has become. A portion corresponding to the cooling part 201a in the coolant flow path 202 is an execution part of the cooling means.

  Of the three portions of the fixed mold 20, a heater 211 is embedded at a position near the sprue 201 in the middle portion in the X-axis direction, and a heater power supply 70 is connected to each heater 211. . In the resin molded body manufacturing apparatus 1 according to the present embodiment, a combination of the heater 211 and the heater power supply 70 serves as means for adjusting the temperature of the resin material in the sprue 201 in the preheating unit 201b. And the heater 211 is an execution part of a temperature control means.

Of the three parts of the fixed mold 20, the left part in the X-axis direction, that is, the part in contact with the movable mold 10, has a heater 214 for heating the cavity 101 as described above. It is embedded corresponding to each cavity 101. A heater power source 45 is connected to each heater 214.
Further, as described above, a protrusion 20a for fitting with the movable mold 10 is formed on the outer periphery of the fixed mold 20, and when the resin material is filled, the movable mold 10 and the fixed mold 20 are separated from each other. In a state in which both the protrusions 10b and 20a are fitted, the lock block 80 having the corresponding recess 80a is fitted to the protrusions 10b and 20a having a trapezoidal shape. The lock block 80 can be moved up and down in the Y-axis direction of FIG. 1 by a stroke mechanism (not shown) such as an air cylinder.

2. Flow of Resin Material During Filling When a resin molded body is manufactured using the resin molded body manufacturing apparatus 1 having the above configuration, a two-component mixed thermosetting resin material is introduced from a hopper (not shown) of the injection unit 30. Then, it is injected into the sprue 201 of the fixed mold 20 by the rotation of the screw 31. At this time, the injection amount of the resin material is adjusted by sliding the valve pin 33 in the X-axis direction.

Resin material injected into the sprue 201 of the fixed mold 20 is in flow in the direction of flow FLOW _R, is cooled by the cooling liquid passage 202 is arranged close cooling unit 201a. The resin material in the sprue 201 flows to the left in the X-axis direction and passes through the preheating unit 201b. At this time, the resin material is heated by the heater 211.
The resin material that has passed through the sprue 201 receives the injection pressure from the injection unit 30, passes through the runner 102, and is filled into the cavity 101.

In the production of a resin molded body using the resin molded body manufacturing apparatus 1, the flow of the resin material is repeated a predetermined number of shots.
3. Temperature Control in Molds 10 and 20 Next, a control mechanism relating to temperature adjustment of the resin molded body manufacturing apparatus 1 having the above configuration will be described with reference to FIG. FIG. 2 is a block configuration diagram schematically illustrating a control mechanism related to temperature adjustment of a resin material or the like in the resin molded body manufacturing apparatus 1 according to the present embodiment.

  As shown in FIG. 2, the resin molded body manufacturing apparatus 1 is provided with a temperature control unit 90 and a main control unit 100 that are not shown in FIG. 1. Further, each of the movable mold 10 and the fixed mold 20 is provided with temperature measuring sections 112, 212, 213, and 215 that measure the temperature of each section corresponding to the cavity 101, the cooling section 201a, and the preheating section 201b. . These temperature measuring units 112, 212, 213, and 215 are connected by signal lines so that temperature information can be fed back to the temperature control unit 90. In addition, the temperature control unit 90 includes a heater power source 40 connected to the heater 111, a heater power source 70 connected to the heater 211, a coolant supply unit 60 that supplies coolant to the coolant channel 202, and a heater power source 45 connected to the heater 214. These are also connected by signal lines.

The temperature control in the resin molded body manufacturing apparatus 1 having the control mechanism as described above will be described with reference to FIG. 3 as an example of a case where a two-component mixed thermosetting resin material is targeted. FIG. 3 is a diagram showing temperature-viscosity characteristics of a two-component mixed thermosetting resin material.
As shown in FIG. 3, the viscosity V of the resin material is once lowered (viscosity V ₁ ) as it is increased from room temperature (25 ° C.) or a temperature T ₂ lower than that (temperature T ₂ → temperature T ₃ ). → Viscosity V ₂ ). The viscosity V of the resin material becomes minimum at the temperature T ₃ (point P _LOW ), and when the temperature is further increased (temperature T ₃ → temperature T ₁ ), the resin material starts to increase rapidly. The viscosity V _{2 at} the point P _LOW is about 1/10 of the viscosity at room temperature (25 ° C.), for example.

In the temperature control unit 90 in the resin molded body manufacturing apparatus 1 according to the present embodiment, the temperature-viscosity characteristics as shown in FIG. 3 are preliminarily tabulated and stored for each resin material. A temperature control pattern is set based on the selection instruction signal.
For example, when the resin material having the characteristics shown in FIG. 3 is selected, the temperature controller 90 cures the resin material in the cavity 101 with respect to the movable cavity heater power supply 40 and the fixed cavity heater power supply 45. The temperature is set to a temperature region B that is equal to or higher than the temperature T ₁ sufficient for promotion, and temperature adjustment is performed while monitoring the temperature of the cavity 101 by the movable side and movable side cavity temperature measuring units 112 and 215. In the temperature control executed by the temperature control unit 90 in the present embodiment, an ON / OFF control method or an inverter control method may be used.

In addition, the temperature control unit 90 controls the amount of the coolant supplied from the coolant supply unit 60 in the fixed mold 20 or the temperature of the coolant, thereby setting the temperature of the resin material in the cooling unit 201a in the sprue 201 to room temperature (25 ° C) or lower temperature T ₂ or less. Also in this control, the temperature control unit 90 performs temperature control based on monitoring information regarding the resin material temperature from the cooling point temperature measurement unit 212.

Next, in the resin molded body manufacturing apparatus 1 according to the present embodiment, the resin material in the sprue 201 is preheated between the cooling unit 201a in the sprue 201 and the heaters 111 and 214 for heating the cavity 101. However, the temperature control unit 90 sets the temperature of the resin material in the preheating unit 201b within the range of the region C or the region D in FIG. That is, the temperature control unit 90, the temperature of the heater 211 is controlled to a temperature higher than the temperature T ₃ of lowest viscosity is low in the resin material of interest. In particular, when the temperature is controlled within the temperature range D in FIG. 3, the viscosity of the resin material when filling the cavity 101 is not too low, so the joint between the movable mold 10 and the fixed mold 20, etc. Therefore, the resin material does not leak from the resin, which is advantageous in reducing defects such as burrs.

Note that the temperature-viscosity characteristics in the resin material as shown in FIG. 3 are obtained for each type of resin material, and the simulation is performed in consideration of the shape of the runners 102 and the cavities 101 in the molds 10 and 20. Based on the analysis result, the optimum viscosity of the resin material when filling the cavity 101 may be examined. Accordingly, for example, if the optimum viscosity of the resin material when filling the cavity 101 is between the viscosity V ₃ and the viscosity V ₄ , the temperature setting of the preheating unit 201b is set to the temperature region D (temperature T ₄ to temperature T ₅ ).

However, the temperature as shown in FIG. 3 - In the case of interest the resin material having viscosity characteristics, it is preferable to set the temperature range higher than at least the point P _LOW temperature setting of preheat portion 201b. This is because the viscosity of the resin material is only increased from the viscosity V ₂ when filling the cavity 101 by setting the temperature range higher than the point P _LOW , and it is easy to control the viscosity of the resin material. It is for having.

In the case of a silicone resin which is an example of a two-component mixed thermosetting resin, each value in FIG. 3 is as follows.
Temperature _T 3: _70~80 (℃)
Viscosity _{V 2: 8~8.5 (Pa · s} )
Temperature _T 4: _90~110 (℃)
Temperature _T 5: _110~130 (℃)
Viscosity _{V 4: 30~35 (Pa · s} )
4). Injection Molding Method Next, an injection molding method using the resin molded body manufacturing apparatus 1 according to the present embodiment will be described with reference to FIG. Note that the flowchart shown in FIG. 4 is executed in cooperation by the temperature control unit 90 and the control unit 100 shown in FIG.

  As shown in FIG. 4, when the operator gives an instruction to start molding to the main control unit 100 of the present apparatus 1, the main control unit 100 that receives this resets the built-in counter (step S1). . Next, the main control unit 100 sends a signal to the temperature control unit 90 to start driving related to temperature adjustment, and the temperature control unit 90 that has received this signal turns on the heater power supplies 40 and 45 corresponding to the cavity 101. The heater power supply 70 corresponding to the preheating unit 201b of the sprue 201 is turned on (step S3), and the driving of the coolant supply unit 60 for cooling the cooling unit 201a is started (step S4). .

  Next, the main control unit 100 sends a drive signal to the cylinder 50 so that the movable mold 10 is closed, and after confirming that the movable mold 50 and the fixed mold 20 are fitted, the lock block The molds 10 and 20 are locked by 80 (step S5). In the locked state of the movable mold 10 and the fixed mold 20, the temperature control unit 90 monitors the monitoring information regarding the temperature from each of the temperature measuring units 112, 212, and 213, and the temperature in each of the units 101, 201a, and 201b is set. It is checked whether or not the temperature is reached (step S6). Specifically, the temperature of the cavity 101 is the temperature region B in FIG. 3, the temperature of the cooling unit 201 a of the sprue 201 is the temperature region A, or the temperature of the preheating unit 201 b of the sprue 201 is the temperature region. It is checked from each monitoring information whether it is C or temperature region D.

  When the temperature control unit 90 confirms that the temperatures of the respective units 101, 201a, and 201b are within the set ranges in step S6 (step S6: YES), the temperature control unit 90 notifies the main control unit 100 of that fact. Send a signal. Receiving this, the main control unit 100 drives a drive motor (not shown) in the injection unit 30 and controls the valve pin 33 to inject the resin material into the sprue 201. The resin material injected into the sprue 201 is filled into the cavity 101 through the runner 102 (step S7).

  The main control unit 100 injects a resin material having a capacity satisfying the cavity 101 and the like, and then slides the valve pin 33 to the left in the X-axis direction in FIG. 1 and stops the rotation of the drive motor of the injection unit 30. In this state, the state is maintained for a sufficient time required for the resin material filled in the cavity 101 to be cured (step S8). Then, after the resin material in the cavity 101 is cured, the main control unit 100 sends an instruction signal for releasing the lock to the lock block 80 and instructs the cylinder 50 to open the movable mold 10. Send a signal. As a result, the movable mold 10 is opened, and the product in the cavity 101 is discharged by the action of a product discharge pin (not shown in FIG. 1 and the like) (step S10).

The main control unit 100 counts up the counter value k by discharging the product (step S11), and the steps from step S5 to step S11 are repeated until the counter value reaches the number of times indicated by the operator (n). Repeatedly.
When the counter value k reaches the number of times (n) (step S12: YES), the main control unit 100 sends a signal to the temperature control unit 90 to stop driving related to temperature adjustment. Upon receiving this signal, the temperature control unit 90 turns off the heater power sources 40 and 45 corresponding to the cavity 101 (step S13), turns off the heater power source 70 corresponding to the preheating unit 201b of the sprue 201 (step S14), and The driving of the coolant supply unit 60 for cooling the cooling unit 201a is stopped (step S15).

The production of the resin molded body using the resin molded body manufacturing apparatus 1 is thus completed.
5. Advantages of the resin molded body manufacturing apparatus 1 and the manufacturing method using the same The resin molded body manufacturing apparatus 1 and the manufacturing method using the same according to the present embodiment having the above-described configuration have the following advantages. .
In the resin molded body manufacturing apparatus 1 according to the present embodiment, the heating temperature of the cavity 101 (with respect to the resin material inside the preheating unit 201b closer to the cavity 101 than the cooling unit 201a in the sprue 201 of the fixed mold 20) Heater 211 for heating to a temperature (temperature region C or temperature region D in FIG. 3) between the temperature region B) in FIG. 3 and the cooling temperature of the cooling unit 201a (temperature region A in FIG. 3). The structure with embedded is adopted.

By adopting such a configuration, the resin molded body manufacturing apparatus 1 optimizes the viscosity of the resin material when filling the cavity 101 by preheating the resin material in the preheating unit 201b of the sprue 201. be able to.
Therefore, in the resin molded body manufacturing apparatus 1, even when a resin material whose viscosity changes according to temperature is used, occurrence of defects such as shape variation of the molded body, generation of unfilled, burrs, and bubbles is generated. Can be suppressed. Moreover, also with respect to the manufacturing method using the resin molded body manufacturing apparatus 1 having the superiority, the occurrence of the above-described defects can be reduced.

  On the other hand, in the conventional resin molded body manufacturing apparatus shown in FIG. 5, as described above, the resin material that has been cooled by the sprue 521 in order to suppress curing is directed toward the cavity 511 that is heated to accelerate curing. As it progresses, its temperature rises rapidly and its viscosity changes rapidly. For this reason, it is difficult to control the viscosity of the resin material when filling the cavity 511 in the manufacture of a resin molded body using the conventional resin molded body manufacturing apparatus. In particular, the viscosity of the resin material when the cavity 511 is filled is also greatly affected by, for example, lot-to-lot variations of the resin material, and the occurrence of variations in the shape of the molded body, unfilled, burrs, bubbles, etc. is effectively prevented. Could not be suppressed.

6). Other Matters The embodiment described above is an example adopted for easy understanding of the structural features of the present invention and the action / curing effected therefrom, and there are various features other than the essential features. Variations can be taken. For example, the main configuration of the resin molded body manufacturing apparatus 1 according to the embodiment shown in FIG. 1 is illustrated by simplifying the shapes of the sprue 201 and the cavity 101 and the like, and a product is manufactured for these shapes. It is designed along the required shape. Further, depending on the complexity of the cavity 101 and the runner 102, the mold configuration can be divided into three or more parts.

Also, as shown in FIG. 1, in the above embodiment, for convenience, the sprue 201 has a simple cylindrical shape, but it is also practical to take a conical shape in consideration of die cutting or the like. Furthermore, a gate can be provided at the boundary between the runner 102 and the cavity 101.
Moreover, in the said embodiment, although the heater which uses electricity as an energy was employ | adopted as a heating means, if it can heat a shaping | molding die locally to the setting temperature besides this, it can employ | adopt. For example, it is possible to adopt a system in which a distribution path is provided so as to be close to the sprue 201 and steam or the like can circulate through the distribution path. Similarly, various variations can be adopted for the cooling system.

Further, in the above embodiment, one preheating unit 201b is provided between the cooling unit 201a and the cavity 101, and the set temperature in the preheating unit 201b is set to one value. It is also possible to perform setting such that the temperature continuously changes in the flow path direction, or a plurality of temperature control units having different set temperatures may be provided.
Moreover, in the said embodiment, although the two-component mixing thermosetting resin material was applied as a resin material used as a shaping | molding object, it is possible to apply also to resin materials other than this. For example, when a thermoplastic resin material is used, the temperature of the resin material near the entrance of the sprue 201 is set high and the temperature of the cavity 101 is set low. What is necessary is just to comprise the part which can be temperature-controlled by the value between the acceleration | stimulation acceleration | stimulation temperature and hardening suppression temperature to the temperature which becomes the optimal value for filling the cavity 101 with the viscosity.

  Further, in the above embodiment, the temperature of the resin material in the sprue 201 in the fixed mold 20 is controlled, but the resin material in the runner 102 in the movable mold 10 may be controlled.

  INDUSTRIAL APPLICABILITY The present invention is a technique effective in realizing a resin molded body manufacturing apparatus and manufacturing method capable of manufacturing a high quality resin molded body while maintaining a high yield.

It is a schematic cross section which shows the main structures of the resin molding manufacturing apparatus 1 which concerns on embodiment of this invention. It is a block block diagram which shows the structure which concerns on each part temperature control in the resin molded object manufacturing apparatus. It is a characteristic view which shows the relationship between the temperature and viscosity in a two-component mixed thermosetting resin. It is a flowchart which shows the drive method in the resin molding manufacturing apparatus 1. It is a schematic cross section which shows the part which concerns on a shaping | molding die among the structures of the conventional resin molding manufacturing apparatus.

Explanation of symbols

1. Resin molded body manufacturing apparatus 10. Movable type 20. Fixed mold 30. Injection unit 31. Cylinder 32. Screw 33. Valve pin 40, 45, 70. Heater power supply 50. Cylinder 60. Coolant supply unit 80. Lock block 90. Temperature control unit 100. Main control unit 101. Cavity 102. Runner 103. Sprue lock 111, 211, 214. Heaters 112, 212, 213, 215. Temperature measurement unit 201. Sprue 202. Coolant flow path 221. Heat insulation

Claims (10)

A mold having a cavity and a flow path of a resin material connected to the cavity;
First temperature adjusting means for adjusting the temperature of the resin material inside the cavity to a first temperature at which curing is promoted is provided in a region near the cavity,
In the vicinity region on the upstream side of the resin flow in the flow path, a second temperature adjusting means for adjusting the temperature of the resin material in the flow path in the portion to a second temperature at which curing thereof is suppressed is provided,
A third temperature controller that adjusts the temperature of the resin material in the flow path in the portion to the third temperature in a region near the downstream side of the resin flow with respect to the portion where the second temperature control means is provided in the flow channel. Means are provided,
The third temperature is based on a temperature-viscosity characteristic of the resin material, and is set to a value between the first temperature and the second temperature. The resin material is a thermosetting material,
The said 2nd temperature is set to the value lower than the said 1st temperature. The resin molded object manufacturing apparatus of Claim 1 characterized by the above-mentioned. The resin material is a material in which, in a temperature-viscosity characteristic, a fourth temperature at which the viscosity is minimum exists between the first temperature and the second temperature,
The said 3rd temperature is set between the said 4th temperature and 1st temperature. The resin molded object manufacturing apparatus of Claim 1 or 2 characterized by the above-mentioned. The said resin material is a material formed by mixing two liquids of a main ingredient and a hardening | curing agent. The resin molded object manufacturing apparatus in any one of Claim 1 to 3 characterized by the above-mentioned. The first temperature adjusting means, the second temperature adjusting means, and the third temperature adjusting means have an execution part related to heat generation or heat absorption in the mold,
In the mold, between the execution part of the first temperature control means and the execution part of the third temperature control means, and between the execution part of the third temperature control means and the execution part of the second temperature control means. The resin molded body manufacturing apparatus according to any one of claims 1 to 4, wherein a heat insulating portion that suppresses or blocks heat flow between each other is interposed in each of the spaces. The first temperature control unit, the second temperature control unit, and the third temperature control unit are connected to a heat control unit that includes data relating to temperature-viscosity characteristics corresponding to the resin material to be filled. The resin molded body manufacturing apparatus according to any one of claims 1 to 5. Filling step of filling a resin material from the opening end of the flow path to the cavity with respect to the mold in which the cavity and the flow path connected to the cavity are formed;
A first temperature adjustment step of adjusting the temperature of the filled resin material to a first temperature at which curing is promoted while maintaining the state where the resin material is filled in the cavity;
A second temperature adjusting step of adjusting the temperature of a part of the inner resin material of the distribution path to a second temperature at which curing thereof is suppressed;
When the resin material inside the part whose temperature has been adjusted to the second temperature in the second temperature adjusting step is filled in the cavity whose temperature has been adjusted to the first temperature, the part in the flow path and the cavity And a third temperature adjusting step for adjusting the viscosity of the resin material inside the portion to a third temperature having a value between the first temperature and the second temperature. A method for producing a resin molded product. The resin material is a thermosetting material,
The method for producing a resin molded body according to claim 7, wherein, in the second temperature adjustment step, the second temperature is set to a value lower than the first temperature. The resin material is a material in which a fourth temperature at which the viscosity is minimum exists between the first temperature and the second temperature in the temperature-viscosity characteristics,
The method for producing a resin molded body according to claim 7 or 8, wherein, in the third temperature adjustment step, the third temperature is set to a value between the fourth temperature and the first temperature. The method for producing a resin molded body according to any one of claims 7 to 9, wherein the resin material is a material obtained by mixing two liquids of a main agent and a curing agent.

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