JP2718651B2 - Injection molding method having a plurality of molds - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an injection molding method having a plurality of dies, which are sequentially transferred to a heating step, an injection molding step, a cooling step, and a molded article removing step for molding.

[0002]

2. Description of the Related Art In injection molding of plastics and the like, cooling and solidification of a resin injection-molded by an injection molding machine are performed.
Performing at that place, taking out the solidified resin molded product from the mold, and adopting the method of injecting the next resin into the same mold, the injection molding machine will be ready for the next injection of resin until the resin is solidified Since it cannot be used, there is a problem in that the use efficiency is poor and the resin in the outlet passage of the injection molding machine is solidified during that time.

[0003] Therefore, a plurality of molds are prepared, and the mold in which the resin is injected by the injection molding machine is removed from the injection molding machine, moved to another place, and cooled and solidified there. A molding system has been proposed in which a resin is immediately injected into the next (different) mold (see, for example, JP-A-58-173635).

[0004] Among such molding systems, the applicant has provided an injection molding machine and a plurality of presses, and moved a mold in which resin was injected and filled by the injection molding machine to one of the plurality of presses. Therefore, there has been proposed a system in which pressure is applied and cooling is performed based on temperature control (Japanese Patent Application Laid-Open No. 61-1986).
No. 89019).

[0005] Further, the present applicant uses a guide and a traverser (hereinafter referred to as a traverse device) that moves on the guide to form a die using any one of a plurality of press machines arranged along the guide in an injection molding process. There has been proposed a molding system (see, for example, FIG. 6 of Japanese Patent Application Laid-Open No. 61-89019) configured to transfer to the next step from the press machine.

[0006]

As described above, in the case of the molding system configured to transfer the mold by using the traverse device, the mold moves along the guide of the traverse device from the injection molding process. A process of transferring to a fixed place (hereinafter, referred to as a base point) and transferring from the base point to any of the presses is performed. At this time, in order to smoothly operate the above-mentioned molding system without stopping the dies, it is necessary to regularly send each of the dies to the next step at a constant time (tact).

However, in the molding system configured as described above, if the temperature of the mold varies at the time of transfer to the temperature raising device due to the individual temperature characteristics of the mold, the time required for the temperature rise becomes longer. And the tact time in the molding system may be disturbed.In addition, since the distance from the base point to each press machine is different, the time required for the mold to be transferred from the base point to each press machine varies. Due to this, a temperature difference occurs in the dies at the time of being charged into each press machine, and the dies pressurized and cooled by each press machine again use the traverse device again at regular time intervals for the next time. In order to lower the temperature of the mold to a predetermined temperature, the time for pressurization and cooling in each press machine is long and short.

Further, even when the dies are transferred from the respective presses to the next molded article removing step, the time required for the dies to be transferred from the respective presses to the next step is different from the transfer distance. In this case, the time varies in each press machine, and the time required for the next process varies as described above.

To cope with this, if the pressurizing and cooling time in each press machine and the process time in the next step are made constant, the mold loaded late in the cooling device is transferred to the next step. In such a case, it is impossible to realize a desired plan of regularly sending the mold every predetermined time (tact), and the flow of the mold may be stagnated in any part of the molding system.

In addition, in the above-mentioned molding system, uniform heating and cooling cannot be performed, and the accuracy of molded products varies. Therefore, if temperature control is performed for each mold in order to cope with this and guarantee the accuracy of the molded product, the difference in temperature characteristics of each mold will cause a longer or shorter process time, and the system will be smoother. This impedes the flow and reduces productivity.

The present invention has been made in view of such circumstances, and when molding a molded article using a plurality of dies, the residence time of the dies in an injection machine or a press machine is different. Although the temperature is raised or cooled to a required temperature, as a whole, a molding method capable of achieving a smooth flow (constant task) of the molding system and obtaining a uniform and highly accurate molded product is provided. The purpose is to:

[0012]

Therefore, in the present invention,
In an injection molding method having a plurality of dies and sequentially transferring them to a temperature raising step, an injection molding step, a cooling step, and a molded article taking-out step, the molding is performed from the injection molding step to the cooling step. When transferring the mold, until the temperature rise of the mold due to heat transfer to the inside reaches the set temperature, measure the transfer time of the mold from the heating step to the injection molding step, and determine the transfer time Compared with a preset set transfer time, the temperature is held as time information of the heated mold, and the transfer speed in the subsequent transfer of the mold is controlled.

According to the present invention, there is provided an injection molding method in which a plurality of molds are sequentially transferred to a heating step, an injection molding step, a cooling step, and a molded article removing step to form a molding material. After transferring the injected mold to the cooling step, the time of the mold in the cooling step to a predetermined cooling temperature is measured, and the measured time is compared with a predetermined cooling time, It is characterized in that the temperature is held as time information of the heated mold, and the transfer speed in the subsequent transfer of the mold is controlled.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an overall configuration diagram of a molding system according to an embodiment of the present invention. Here, continuous and high productivity molding is achieved by repeating the steps described below.

That is, the molding system 25 in the present embodiment.
Are: A: heating step, B: injection molding step, C:
Pressurized cooling process, D: Consists of 4 processes of molded product removal process,
The temperature raising step A and the injection molding step B are connected by a die transfer path 1 using rollers, and the injection molding step B and the pressurizing and cooling step C are connected by a die transfer path using rollers. 5 and the NC traverse device 2, and the pressurizing / cooling process C and the molded product removal process D are connected by the NC traverse device 2.

Further, a traverse device control unit 22 is connected to the NC traverse device 2, and the traverse device control unit 22 is connected to the central control panel 17. The central control panel 17 is also connected to other devices of the main molding system (the wiring is omitted).

Next, each device of the molding system 25 will be described. In the temperature raising step A, a longer time is required than in the injection molding step B. Therefore, two temperature raising devices 6 are provided, and while the temperature of the mold is raised in one device, the other is used. The apparatus described above is also configured so that the temperature of another mold can be raised in the same manner. A direction changer 23 using a roller is provided in front of each of the temperature raising devices 6. After the mold is carried into one of the temperature raising devices 6, the direction changer 23 is rotated by 90 degrees to increase the temperature of the other. By transporting the mold from the apparatus 6, the mold sent from the molded product removal apparatus 15 is sent into the temperature increasing device 6, and the mold in the temperature increasing device 6 is sent to the injection molding machine 7. Can be. The rollers of the direction changer 23 are driven to rotate by a built-in drive source (not shown). In addition, a transfer path 24 using rollers is connected between the molded product take-out device 15 and the direction changer 23, between the direction changer 23 and the temperature raising device 6, and between the direction changers 23. The rollers are also rotatably driven by a built-in drive source (not shown), as described above.

In such a temperature raising apparatus 6, after a mold is carried into the furnace of the apparatus, a temperature sensor (not shown) is connected to the mold, and the mold is heated by a heater plate (not shown). The mold is heated. After being heated to a predetermined temperature, the temperature sensor is separated from the mold, and the mold is carried out of the furnace.

In the present embodiment, in particular, the metal mold cooled to 80 ° C. in the previous pressurizing and cooling step C (described later) is heated to 100 ° C. in 60 seconds in the temperature increasing step A. The control system is set. The temperature raising step A and the injection molding step B are connected by a mold transfer path 1 and a 90-degree reversing device 3a, and the mold transfer path 1 is equipped with an elevator 26 at a portion bent at a right angle in the middle thereof. The rollers arranged in the mold transfer direction are rotationally driven by a drive source (not shown) incorporated therein to move the mold placed on the rollers in the transfer direction.

The mold transferred from the direction changer 23 to the elevator 26 via the mold transfer path 1 here changes its direction of movement by 90 degrees without changing its direction.
It is possible to proceed to the 90-degree reversing device 3a in that direction. The 90-degree reversing device 3a reverses the mold by 90 degrees in order to make the runner portion of the mold horizontal, against the injection molding machine 7 in which the injection section 7a is provided in the horizontal direction. After passing through the 90-degree reversing device 3a, the mold is transferred to the mold standby position 4 in front of the injection molding machine 7,
At the mold standby position 4, a temperature sensor (not shown)
, The mold temperature is measured.

The mold which has already been heated to 100 ° C. in the heating step A is further heated by heat conduction in the mold, and the mold temperature is raised to a predetermined molding temperature of 120 ° C. Is carried into the injection molding machine 7 to receive the resin injection molding. In the present embodiment, after the temperature raising step A is completed, the molding temperature 1 is set at the standby place 4 in front of the injection molding machine 7.
The set time until the temperature is raised to 20 ° C. is 120 seconds.

In the injection molding step B, when the mold is carried into the injection molding machine 7, the die set of the molding machine 7 is clamped, and after the resin at 220 ° C. is injected into the mold, it is kept for a predetermined time. After the die set is opened, the mold is carried out while being closed and sent to the 90 ° reversing device 3b. Note that the injection molding machine 7 is provided with a temperature controller 8 for adjusting the temperature to a temperature required for injection-filling the mold.

In this embodiment, after the mold is carried into the injection molding machine 7, it is carried out of the injection molding machine 7,
The time required to reach the NC traverse device 2 (the point of the base point 13 described later) is set to be 60 seconds. The 90-degree reversing device 3b is disposed behind the injection molding machine 7, and the runner portion of the mold after the injection is returned upward.

In the injection molding process B, the mold flows on the transfer path with the runner part lying down by the 90-degree reversing devices 3a and 3b, and the pressurizing and cooling process C, the unloading process D, and the temperature increasing process A In this case, the water flows on the transfer path with the runner part facing upward. In addition, when the injection of the injection molding machine is configured to be performed in a downward direction, or when the mold is in any of the pressurizing and cooling step C, the unloading step D, and the temperature increasing step A, the runner portion is horizontally moved. In the case where the processing is performed in the orientation, the 90 ° reversing devices 3a and 3b are unnecessary.

The mold transfer path 5 is connected to the mold passing through the 90-degree reversing device 3b by the base point 13 of the NC traverse device 2.
(The point where the NC traverse device 2 receives the mold).
Rollers arranged in the transfer direction are rotated by a drive source (not shown) incorporated therein, and can move a mold placed on the rollers.

In the present embodiment, the NC traverse device 2 includes two guide rails 9 and a traverser 10 that moves on the guide rails 9. The traverser 10 includes a pair of left and right input conveyors 11 and an output conveyor 12. Have been. The charging conveyor 11 is operated by a driving source (not shown) incorporated therein, and can take in the dies from below in FIG. 1, place them on the conveyor, and send them upward. It can be used when transferring the mold from the base point 13 to each press machine 18. The take-out conveyor 12 is operated by a drive source (not shown) incorporated therein, and can take in the mold from above in FIG. 1, place the mold in the conveyor, and send the mold downward. This is used when the mold is transferred from each press machine 18 to the molded product removal device 15.

In this embodiment, the NC traverse device 2
Using this, the time required for the mold to reach from the base point 13 to each of the press units 18 is 30 seconds, and the time required for the mold to reach from each press unit 18 to the molded product removal device 15 is 30 seconds. Thus, the transfer speed is set.

The pressurizing and cooling step comprises eight press units 1
8 (No. I to No. VIII), and each press unit 18) is arranged in parallel with the rail 9 of the NC traverse device 2. Also, when each traverser 10 moves and comes before each press unit 18,
It is provided at a predetermined distance from the rail 9 so that the dies can be exchanged between the traverser 10 and the transfer path 14 of each press unit 18. In addition, the transfer path 14
It is operated by a drive source (not shown) incorporated therein, and can transfer a mold placed thereon.

The press unit 18 has a pair of upper and lower re-press cooling die sets. In each of the die sets, a pipe for flowing a refrigerant is provided with pipes 62a and 62b of cooling medium supply means. (Not shown). Then, the flow rate of the refrigerant flowing through the pipeline of each die set is controlled by the central control panel 17 and the traverse device control unit 22 under the control of the fixed side temperature controller 1
9 and the movable-side temperature controller 20.

When the mold is inserted into a pair of upper and lower repress cooling die sets, a temperature sensor is connected to the mold,
The upper and lower die sets move relatively to press and contact the mold, and the mold is cooled by the refrigerant flowing through the pipeline in the die set. The cooling of the mold is performed with control such as changing the flow rate or temperature of the refrigerant in the pipeline so as to obtain a predetermined temperature gradient. As a result, shrinkage strain and internal stress strain generated when the molded article is cooled can be minimized.

In the pressurized cooling step C, the mold is cooled from 120 ° C. to 80 ° C. while being measured by a temperature sensor. When the mold is cooled to a predetermined temperature, the temperature sensor is released from the mold, the die set is relatively opened, and the mold is transferred to the take-out conveyor 12 of the traverser 10 via the transfer path 14.

In the present embodiment, the time required for the pressurizing and cooling step C, that is, the mold
Is set so that the time required to complete the cooling and exit the transfer path 14 after that is 480 seconds. In the present embodiment, the molded product removal process D is installed at the lower right end of the NC traverse device 2 in FIG.
5, a stocker 21 is installed on the right side. When the traverser 10 moves and comes in front of the molded product take-out device 15, a take-out device is provided between the take-out conveyor 12 of the traverser 10 and the transfer path 16 of the molded product take-out device 15 so that a die can be transferred. Reference numeral 15 is provided at a predetermined distance from the rail 9.

When the mold is mounted on the molded product take-out device 15 via the transfer path 16 by the traverser 10, the opening prevention mechanism provided on the mold is released, and the mold is opened. The molded product is protruded from the mold by the molded product protruding rod and stored in the stocker 21. The mold from which the molded product has been removed is clamped, the stopper is locked, and transferred to the temperature raising step A (not shown).

In this embodiment, the time required for the unloading step D, that is, the mold is carried into the transfer path 16 of the unloading device 15, and thereafter, the mold from which the molded product has been removed moves to the temperature increasing step A. It is set so that the time required until the time is 60 seconds. Also, the removal of the molded product which has been pressurized and cooled by the press unit 18 and is completed is not performed on the press unit, but is performed intensively by the molded product removal device 15 provided at another position as described above. . This is because, when an unloading device is provided on the press unit 18, the structure of the press unit becomes complicated and large, and each press unit 1
No. 8 must be provided with an unloading device. I-No. Since the occupied area occupied by the VIII increases and the management of the unloading process becomes complicated, this embodiment solves the above problem by performing the unloading work at one place. .

The traversing device control section 22 instructs the operation of the NC traversing device 2 and the like in accordance with a predetermined program.
By controlling the NC traverse device 2, standby and speed adjustment of the traverser 10 can be performed. Also, the central control panel 1
Reference numeral 7 is connected to each device of the main molding system 25 via a control unit (not shown) of each device, and controls the main molding system 25 as a whole.

It should be noted that the system 25 has a function of detecting whether a mold flowing through the system is at a predetermined position.
A sensor is provided at the predetermined position. That is, the base point point of the transfer path 5, the inside of the input conveyor 11 and the take-out conveyor 12 of the traverser 10, the portion where the die in each press unit 18 (No. I to No. VIII) is mounted, or the removal of the molded product A microswitch or the like is provided in a portion of the device 15 where the mold is mounted, and is configured to detect whether the mold is at a predetermined position.

Next, the arrangement and flow of the dies in the molding system according to the present embodiment will be described with reference to FIG. However, this is a case in which the mold is controlled so as to be transferred at a set time in each step. FIG. 2 is a time chart of the dies. The horizontal axis indicates the time as 1 minute = 1 time, and indicates the position of each die in the molding system as the time progresses.

Here, one minute, which is the time required for the injection molding step and the transfer of the mold to the base point, is set as the basic time, and each resin is injected into the mold every minute in the injection molding step. The mold is designed to flow into the system with a one minute delay. Further, in the present embodiment, a total of three minutes is used for the temperature raising step and the transfer of the mold to the injection molding machine, and one minute is used for the injection molding step and the transfer of the mold to the base point.
0.5 minute for transferring the mold to the target press unit in the NC traverse device 2, 8 minutes for the pressurizing and cooling step, 0.5 minute for transferring the mold to the unloading device 15 in the NC traverse device 2,
Because it is set to give 1 minute to the extraction process,
The total of 14 minutes is the time required for the mold to go through a molding cycle, and therefore 14 ÷ 1 = 14 molds:
Must be located in the system.

FIG. 1 shows the positions of the fourteen dies a to n at the time 14. As shown in FIG. 2, when the time advances from this state to the time 15, the dies a to n advance respectively. For example, the die a is located at the position of the die n, and the die n is the die f. At the position of the mold f
Returns to the position of the mold e. Further, when the time reaches time point 16, for example, the mold a moves from the position of the mold n to the position of the press unit VII.

In the actual molding system, if the transfer of the dies is performed according to the above-mentioned time chart, the temperature of the dies varies due to the difference in the temperature characteristics of each of the dies, and the dies are out of the range of the molding conditions. As a result, high-precision molding cannot be expected. In addition, if a method of cooling and raising the mold temperature to the target value is adopted, high-precision molding is possible, but excess or deficiency occurs in each process time, which hinders the smooth flow of the system and reduces mass productivity. It will be significantly worse.

Therefore, in the present embodiment, the cooling and temperature raising in the process are not terminated until the mold temperature reaches the target value in each process. The error of the time caused by the shortage or shortage is controlled by the NC traverse device 2 by adjusting the waiting time at the time of transferring the mold, or by controlling the transfer speed, so that the mold in the entire system is controlled. No stagnation occurs during transfer.

As described above, the condition determination as to whether or not the transfer of the mold is controlled by adjusting the waiting time or the transfer speed can be determined in the following three cases. That is, first, in the temperature raising step A, the temperature raising time for raising the temperature of the mold from the initial 80 ° C. to the target value of 100 ° C. is longer or shorter than the set time of 60 seconds. Is. If from setting time becomes longer heated time adjustment by accelerating the (indicating the delay time that occurs when at T _h), from the base point 13 of the mold to each press unit 18 transport speed (indicated by V _BP) I do. Also, when the shorter raised time than setting time is adjusted by adding NC mold temperature which is transferred by the traverse device 2, (shown by T ₁₎ latency at each press unit 18 before.

Second, the mold is transferred from the heating step A to the injection molding step, that is, the mold is unloaded from the heating step A and reaches the standby place 4 in front of the injection molding machine 7. At the time when the mold temperature rises to the target value of 120 ° C.,
Whether the excess or deficiency occurs for the set time of 120 seconds. Also in this case, similarly to the above, it is possible to adjust the excess or deficiency of the set time by controlling the transfer waiting time of the mold from the base point 13 to each press unit 18 and controlling the transfer speed (the delay generated in this case). time is indicated by T _n, showing the transfer waiting time at T _1).

Thirdly, in the pressurizing and cooling step C, it is determined whether the set time required for the mold temperature to reach the target value of 80 ° C. from 120 ° C. exceeds 480 seconds or not. When the set time is exceeded (the delay time generated at this time is indicated by T _p ), the transfer speed of the mold (indicated by V _PT ) from each press unit 18 to the molded product removal device 15 is adjusted, and the set time is set. If a is missing at the control unit 22 of the traverse device, the temperature of the transported die is adjusted by adding a product removal device 15 waiting in front (shown by T _2).

Next, the operation of the NC traverse device of the molding system according to the present embodiment will be described with reference to the system diagram of FIG.
6 to 12 showing flowcharts for each management flow will be described with reference to the block diagrams of FIGS. In operating this system, the central control panel 17
The various initial setting values are stored in the memory. In FIG. 3, the transfer time T _BP between each press unit 18 (No. I to No. VIII) and the base point 13 is set (B1), the transfer speed V of the traverser 10 is set (B2), and each press unit 1 is set.
8 to set the transfer time T _PT between the unloading device 15 (B3),
Setting the distance L _x between each press unit and the base point 13 (B4), the distance L between each press unit and the lead unit
_y is set (B5), and the set values B1 to B5 are recorded in the memory M of the central control panel 17. Further, the memory M, the time set in the later-described heating step (t _1), setting the time between the injection molding process from Atsushi Nobori (t _2), the time set in the pressurized cooling step (t ₃₎ is stored .

First, the mold from which the molded product has been removed and emptied in the molded product removal process D is loaded into the heating device 6 (Sal) in the mold transfer management flow chart of the heating process A shown in FIG. After that, connect the temperature sensor to the mold (Sa
2) Then, the heating is started while measuring the mold temperature, and at the same time, the measurement of the heating time is started (Sa3, 4, 5). The mold temperature is obtained by a signal from the temperature sensor by the temperature measuring means 40.
It can be captured by reading with. Measurement of heating time is the first
Performed by the time measuring means T ₁ of the. The temperature is raised until the mold reaches the target value of 100 ° C. (Sa6), and ends when the mold reaches the target value. Then, the timer for measuring the heating time is turned off (Sa7), and the time signal is sent to the time measuring means T ₁
And the temperature sensor is released from the mold (S
a8).

At this time, the central control panel 17 compares the measured heating time (hereinafter referred to as a measured heating time, the same applies hereinafter) with a set heating time (set heating time t ₁ , the same applies hereinafter). Is performed by the first comparing means 42 (Sa
9) When the measurement time T ₁ is shorter than the set time t ₁ , FIG.
In the process shown in (1), the waiting time of the traverser 10 is controlled (to be described later).

[0048] Also, when the measured Atsushi Nobori time is equal to or longer than the set heating time, calculation of the delay time by subtracting the set heating time from the measurement Atsushi Nobori time T _h is performed by the first calculation means 43 ( Sa10), the delay time T _h is the central control panel 1
7 (Sa11), and thereafter, the speed of the traverser 10 is controlled from the base point 13 to the press unit 18 in the step shown in FIG.

Next, in the mold transfer management flow chart between the temperature raising step A and the injection molding step shown in FIG. 7, after the die temperature raising in the temperature raising step A is completed (Sb1), the injection is performed from the temperature raising step A. The measurement of the mold transfer process time until the molding process is started by the _second time measuring means T2 (Sb
2) The mold is transferred to the standby place 4 in front of the injection molding machine 7 (Sb3). Thereafter, at the standby location 4, a temperature sensor is connected to the mold (Sb4), and the temperature of the mold is measured by the second temperature measuring means 44.

The mold that has gone out of the temperature raising step A is further heated by the heat conduction in the mold before reaching the standby place 4 in front of the injection molding machine 7. Therefore, at the time when the mold temperature reaches between the lower molding temperature limit and the upper molding temperature limit (Sb5) by the temperature measurement of the mold, the molding preparation is performed based on the measurement signal of the second temperature measuring means 44. and completion signal is issued from the central control panel 17 (Sb6), the second time measuring means T ₂ is O
FF is performed (Sb7). Thereafter, the mold temperature sensor is separated from the mold (Sb8). At this time, in the central control panel 17, the measurement time (T ₂ ) of the second time measurement means T ₂ is compared with the set time (t ₂ ) by the second comparison means 46 (Sb9). When the measurement time (T ₂ ) is shorter than the set time (t ₂ ), the waiting time control of the traverser 10 is performed in the process shown in FIG. 9 (to be described later). If the measured time is longer than or equal to the set time, the second calculating means 48 calculates the delay time T _i obtained by subtracting the set time from the measured time (Sb10). And this delay time T _i
Is recorded on the central control panel 17 (Sb11), and thereafter, the speed of the traverser 10 is controlled from the base point 13 to the press unit 18 in the process shown in FIG.

Further, in the control flowchart in the pressurizing and cooling step shown in FIG. 8, after the temperature sensor is connected to the mold carried into the press unit 18 (Sc1) (Sc2), the third temperature measuring means 50 is operated. The operation is started, and the pressurized cooling step is started (Sc3). Then, at the same time, the measurement of the time required for the cooling process is started by the third time measuring means 52 (Sc4). Cooling is performed while controlling with a predetermined temperature gradient (Sc5), and when the mold temperature reaches a temperature lower than the target temperature of 80 ° C. (Sc6).
Then, the processing is terminated by the measurement signal of the third temperature measuring means 50. Then, the third time measuring means 52 is turned off (S
c7), the temperature sensor is released from the mold (Sc)
8). At this time, in the central control panel 17, a comparison between the measurement time of the third time measuring means 52 and the set time (t ₃ ) stored in the central control panel 17 is made by the third comparing means 54 (Sc9). If the measurement time is shorter than the set time, the waiting time control of the traverser 10 is performed in the process shown in FIG. 11 (hereinafter, described later). If the measurement time is longer than or equal to the set time, the calculation of the delay time T _P in the cooling step, which is obtained by subtracting the set time from the measurement time, is performed in the third step.
The speed of the calculating means 56 is performed (Sc10), the delay time T _P is recorded in the central control panel 17 (Sc11), thereafter, the traverser 10 in step shown in FIG. 12 to take-out device 15 from the press unit 18 Control is performed (to be described later).

In the process shown in FIG. 9, first, the traverser 1
After the mold is carried out to the unloading device 15, the process returns to the base point 13, and the charging conveyor 11 stops in a state in which it matches the transfer path 5. Then, according to a command from the traverse device control unit 22, a sensor S provided in the take-out conveyor 12 is provided.
₁ detects the output, thereby, whether the mold is present to verify the removal conveyor 12 (S01), and outputs a confirmation signal S _1. Then, the output of the sensor -S ₂ provided in the charging conveyor 11, whether the mold is present to verify in charging conveyor 11 (S02), and outputs a confirmation signal S _2, further sensor S ₃ Of the mold is checked on the mold transfer path 5 before the feeding conveyor (S0).
3), and outputs the confirmation signal S _3.

When it is confirmed that the mold is present on the transfer path 5, the signals of the sensors S ₁ , S ₂ and S ₃ shown in FIG. The conveyor operating means 60 is output according to the signal, whereby the charging conveyor 11 is operated (S04), and the mold is placed in the charging conveyor 11.

[0054] Further, that the mold is within charging conveyor confirmed by the sensor S ₂ (S05), then press unit No. traverser 10 should reach Is selected by the press unit selecting means 58 (S06). The presses (I to VIII) in the pressurizing and cooling step C are provided with pipes 62a and 62b through which the cooling medium flows, and the cooling medium is supplied from the cooling medium supply means 62 through the passages 62a and 62b. Supplied. In addition, the central control panel 17
In the memory M, setting (curve) information indicating a cooling temperature corresponding to the resin material, the shape, and the finishing accuracy of the molded product is input to the memory M.

Each press machine has sensors D _{1 to} D ₈ for measuring the cooling temperature of the mold, and measures the cooling time after each mold is inserted into each press machine and starts pressurized cooling. means P ₁ to P ₈ are provided. The sensors D _{1 to} D ₈
And the signals of the measuring means P _{1 to} P ₈ are input to each memory by the central control panel 17. In the central control panel 17, the comparing means 64 provided therein compares the information of the temperature and the cooling time from each mold with the setting information inputted in advance, and outputs a comparison signal of the comparing means 64. The cooling medium is sent to temperature adjusting means 66 for adjusting the temperature of the cooling medium. Then, in the temperature adjusting means 66, based on the signal of the comparing means 64,
The temperature of the medium supplied to each press is adjusted.

The central control panel 17 is provided with a discriminating means 68 for inputting information on the cooling time and the cooling temperature of each mold from each press machine and discriminating the mold where the pressurized cooling is completed. As shown in FIG. 5, the discriminating means 68 compares the information (CP ₁ , CP ₂ ... CP ₈ ) from each press with the reference information CP ₀ inputted to the memory, by comparing means (n ₁ to
n ₈ ), and when the information from the press reaches a value indicating the end of cooling, comparison signals n _{1 to} n ₈ are output, and the detection means 70 detects the presence or absence of this comparison signal. Then, it is determined which mold has finished the pressurizing and cooling operation.

The central control panel 17 inputs the detection signal 70a of the detection means 70 to the traverse device control section 22.
The traverse device controller 22 receives the detection signal 70a, drives the driving means 72 of the traverser 10 at the base point 13, and operates the traverser 10.

In a press machine containing a mold that has completed the pressurizing and cooling action, according to the outputs of the comparison signals n _{1 to} n ₈ ,
The end signal generating means 74 outputs end signals m _{1 to} m ₈ . The traverser 10 is driven by the driving means 72 and stopped to accommodate the die, which has been output by the end signal generating means. At this stop position, the traverser 10 stands by (S07 / S08). This waiting time T
_1, in the first waiting time calculating means B9 of the central control panel _{17, T 1 = T BP -L} x / V ( FIG. 3, B9) is calculated from the formula (S09), the traverse device controller 2
2 is input. The traverse device control unit 2
In response to a command 2, it is cause to wait traverser 10 only waiting time T ₁ (S10).

After the traverser 10 is kept on standby for a predetermined time, the take-out conveyor 12 is operated, and the mold is transferred from the press unit 18 to the take-out conveyor 12 (S12). Then, it is confirmed that the mold is present in the take-out conveyor 12 (S13).
Is the transfer path 1 of the press unit 18 from which the mold is taken out.
The traverser 10 is slightly moved so as to coincide with the number 4 (S14, S15).

Then, the charging conveyor 11 is operated (S16), the die is fed into the press unit 18, and the presence of the die in the press unit 18 is confirmed by a sensor (S17). Next, in the cooling process, the central control panel 17 instructs whether to reach the process shown in FIG. 11 or the process shown in FIG. 12 depending on whether or not the measured time is equal to the set time (S18). That is, when the delay time T _p by the operation did not occur in the cooling step, leading to stroke shown in FIG. 11, when the delay time T _p occurs, leading to stroke shown in FIG. 12.

In the process shown in FIG. 10, when the traverser 10 returns to the base point, there is a mold in the take-out conveyor 12 (S41), a mold in the input conveyor 11 (S42), and the input conveyor 11 Is there a mold before (S4
3), the process proceeds to S44, the charging conveyor 11 is operated, and the mold is placed in the charging conveyor (S44).
45).

Then, as in the case of the waiting time control, the traverser 10 sets the press unit No. to be reached next. Is selected (S46). Press unit No. And at the same time, the speed of the traverser 10 is set and the traverser 1 is set.
0 (S47). The transfer speed V _BP of the traverser 10 is determined by the first speed calculating means B11 of the central control panel 17.
In, is calculated by the equation _{V BP = L x / (T} BP -T h -T i) ( FIG. 3, B11), the moving speed V _BP is input to the traverse device controller 22. Then, the traverser 10 is transferred according to a command from the traverse device controller 22.

According to the commanded speed, the traverser 10
Is moved to the selected press unit (S48), and the take-out conveyor 12 stops in a state where it coincides with the transfer path 14 of the press unit 18 (S49). Press unit 18
Then, the traverser 10 is slightly moved to make the input conveyor 11 coincide with the transfer path 14 (S52, S53), and the mold in the input conveyor 11 is transferred to the press unit. (S54, S5
5). Next, in the pressurizing and cooling process, the central control panel 17 instructs whether to reach the process shown in FIG. 11 or the process shown in FIG. 12 depending on whether or not the measurement time is equal to the set time (S56). That is, when the delay time T _P by the operation did not occur in the cooling step, leading to stroke shown in FIG. 11, when the delay time T _P is generated, leading to stroke shown in FIG. 12.

In the process shown in FIG. 11, when it is confirmed that the die is present in the press unit 18, the traverser 10 is moved to the molded product take-out device 15, and the take-out conveyor 1 is moved.
2 is stopped in a state where it coincides with the transfer path 16 of the molded product removal device 15 (S19, 20). Then, at that position, the traverser 10 is made to wait for a predetermined time according to a command from the traverse device controller 22 (S22). The waiting time T ₂ are, in the second waiting time computation unit B10 of the central control panel _{17, T 2 = T PT -L} y / V is calculated from the equation (FIG. 3, B10) (S21), the waiting time T ₂ is input to the traverse device controller 22, by a command from the traverse device control unit 22, by product removal device 15 before the traverser 10, and waits waiting time T ₂ (S2
3).

After waiting for a predetermined time, the unloading conveyor 12
Is operated to take out the mold from the take-out conveyor 12 to the molded product take-out device 15 (S24). Then, the molded product removal device 15
After confirming that there is a mold inside (S25), the traverser 10 is sent to the base point 13, and the traverser 10 is stopped in a state where the input conveyor 11 matches the transfer path 5 (S26, S27). Next, when the measured heating time is equal to the set heating time in the heating step and the measuring time is equal to the set time in the mold transfer process from the heating process to the injection molding process, the process shown in FIG. 9 is reached. Otherwise, a command is issued from the central control panel 17 to reach the stroke shown in FIG. 10 (S28).

In the process shown in FIG. 12, the setting of the transfer speed V _PT from the press unit 18 of the traverser 10 to the molded product removal device 15 is performed by the second speed calculation means B12 of the central control panel 17 where V _PT = _{L y / (T PT -T P} ) is performed by the calculation (FIG. 3, B12) (S57), the transport speed V _PT is input to the traverse device controller 22, the traverser by a command of the traverse device controller 22 10 is transferred from the press unit 18 to the molded product removal device 15 at a transfer speed _VPT .

Then, at the commanded speed, the traverser 10 moves to the unloading device 15 (S58), and the unloading conveyor 12 stops in a state where it coincides with the transfer path 16 of the unloading device 15 (S59). It is confirmed that the work is not being performed, and at the same time as the operation is stopped, the take-out conveyor 12 is operated and the mold is transferred from the take-out conveyor 12 to the take-out device 15 (S60, 61).

The traverser 10 in which the input conveyor 11 and the take-out conveyor 12 are both empty returns to the base point 13 (S62), and the input conveyor 11 returns to the base point 1.
Then, the operation is stopped in a state where the number matches 3 (S63). Next, in the heating step, when the measured heating time is equal to the set heating time, and when the measuring time is equal to the set time in the mold transfer step from the heating step to the injection molding step, FIG. If not, the central control panel 17 instructs whether to reach the stroke shown in FIG. 10 (S6).
4).

In the above embodiment, the traverse device is composed of a rail and a traverser. However, this traverse device is provided on a flat road surface using a guide device or the like without providing a rail. Various other forms are conceivable, such as moving the traverser.
In addition, the traverser device can be used not only for linearly moving the mold, but also for arranging the press units in various other forms such as arcs and moving the mold along the form. Further, in the above embodiment, the heating device is a heating system using a heater plate. However, as the heating device of the R, various other types using a constant temperature bath or the like can be considered.

[0070]

As described in detail above, the present invention has a plurality of dies, which are sequentially transferred to a heating step, an injection molding step, a cooling step, and a molded article removing step to be molded. In the injection molding method, when the mold is transferred from the injection molding step to the cooling step, the temperature is raised from the temperature rising step to the injection molding step until the temperature rise of the mold due to heat transfer to the inside reaches a set temperature. Measuring the transfer time of the mold until
Comparing the transfer time with a preset set transfer time,
It is characterized in that the temperature is held as time information of the heated mold, and the transfer speed in the subsequent transfer of the mold is controlled.

Therefore, conventionally, there is a variation in the temperature of the mold at the time of the injection step, but in this molding method, the temperature at that time is constant, the molding conditions of the injection molding are stabilized, and Even if the tact of the molding die is disturbed to adjust the temperature condition, the time difference of the mold transfer is eliminated during the transfer of the mold after the injection process, and the flow of the mold in the molding system is kept constant as a whole. It can be implemented in tact.

Further, according to the present invention, there is provided an injection molding method in which a plurality of molds are sequentially transferred to a heating step, an injection molding step, a cooling step, and a molded article removing step and molded. After transferring the mold that has been injected to the cooling step, the time of the mold in the cooling step is measured to a predetermined cooling temperature, and the measured time is compared with a predetermined cooling time. It is characterized in that the temperature is held as time information of the heated mold, and the transfer speed in the subsequent transfer of the mold is controlled.

Accordingly, by lowering the mold to the required temperature in the cooling step, a high homogeneity of the molded article is ensured, and the time difference generated at that time is used to transfer the mold during the subsequent transfer of the mold. Eliminate the time difference, as a whole,
The flow of the mold in the molding system can be performed with a constant tact.

As described above, according to the present invention, the mold temperature can be reliably controlled in each step, and the molding system can be smoothly operated without causing stagnation in a plurality of molds flowing through the molding system. As a result, high accuracy of the molded product is ensured by the stable molding conditions, and the productivity can be secured.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram of a molding system according to the present invention.

FIG. 2 is a time chart of a mold in the molding system of FIG. 1;

FIG. 3 is a block diagram relating to control of a central control panel and a traverse device of FIG. 1;

FIG. 4 is a block diagram relating to a conveyor operating means of FIG. 1;

FIG. 5 is a block diagram relating to traverser driving means.

FIG. 6 is a flowchart showing a mold transfer operation of the molding system of FIG. 1;

FIG. 7 is a flowchart showing a mold transfer operation of the molding system of FIG. 1;

FIG. 8 is a flowchart showing a mold transfer operation of the molding system of FIG. 1;

FIG. 9 is a flowchart showing a mold transfer operation of the molding system of FIG. 1;

FIG. 10 is a flowchart showing a mold transfer operation of the molding system of FIG. 1;

FIG. 11 is a flowchart showing a mold transfer operation of the molding system of FIG. 1;

FIG. 12 is a flowchart showing a mold transfer operation of the molding system of FIG. 1;

[Explanation of symbols]

 Reference Signs List A Temperature raising process B Injection molding process C Cooling process D Molded product removal process 2 NC traverse device 4 Stand-by place before die injection molding machine 6 Temperature raising device 7 Injection molding machine 9 Guide rail 10 Traverser 11 Input conveyor 12 Extraction conveyor 13 Base point 15 Molded product take-out device 17 Central control panel 18 Press unit 22 Traverse device control part an mold

Claims (2)

(57) [Claims] 1. An injection molding method comprising a plurality of dies, which are sequentially transferred to a temperature raising step, an injection molding step, a cooling step, and a molded article removing step to form a molded article. When transferring the mold to the process, until the temperature rise of the mold due to heat transfer to the inside reaches the set temperature,
Measure the transfer time of the mold from the temperature raising step to the injection molding step, compare the transfer time with a preset transfer time set in advance, and hold it as time information of the heated mold. An injection molding method, wherein the transfer speed in the subsequent transfer of the mold is controlled. 2. An injection molding method in which a molding material is injected by a plurality of dies, which are sequentially transferred to a temperature raising step, an injection molding step, a cooling step, and a molded article taking-out step to perform molding. After the transfer to the cooling step, the time of the mold in the cooling step, until a predetermined cooling temperature is measured, comparing the measured time with a predetermined cooling time, the temperature is increased. An injection molding method characterized by holding as time information of a mold, and controlling a transfer speed in the subsequent transfer of the mold.