JP2002001771A - System for replacement of injection mold - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a system for replacement of an injection mold which is aimed to enhance the efficiency in an operation of replacing the mold in an injection molding machine. SOLUTION: The system comprises a process of inputting beforehand the conditions of production of a subsequent mold Dn to be used subsequently in the injection molding machine 10, before the end of production of a precedent mold Dp used at present, a process of setting the subsequent mold Dn on a mold replacing truck 20, a process of taking out the precedent mold Dp onto the mold replacing truck according to the end of production thereof and a process of carrying the subsequent mold Dn from the mold replacing truck 20 into the injection molding machine 10 and fitting it thereto. The conditions of production include the mold setting conditions such as the dimension of the thickness of the subsequent mold and the mold opening position of a parting line face.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mold exchanging system for injection molding, and more particularly, to the preparation for exchanging the next mold during injection molding, and immediately after the end of production, the operation of exchanging the mold. The present invention relates to an injection mold changing system suitable for performing the above.

[0002]

2. Description of the Related Art Conventionally, for example, in the injection molding of a synthetic resin, as a work for exchanging a mold, production is generally stopped,
Stopping and draining water, removing the mold, inputting the injection molding conditions for the next mold, setting the next mold installation conditions, positioning the mold exchange trolley, installing the mold, purging (removing remaining material), production Start, each step.

[0003]

In the conventional mold exchanging operation, such a large number of steps are required, so that the mold exchanging operation requires time and a large number of operations are required due to a wide variety of setups. Was involved in this mold change, which hindered labor saving. Furthermore, the setup work for mold replacement requires skill, and the work efficiency is reduced due to individual differences, and further, there is no problem in terms of safety in the mold replacement work.

[0004] The problem to be solved by the present invention is to input setting conditions for setting a next die to be used in the injection molding machine before the end of production by the currently used die in the injection molding machine. At the same time, the mold to be used is prepared on a mold exchanging trolley, and a mold exchanging system for injection molding is provided which can be set up at the end of production by the mold in use and work can be started with the next mold. To provide. As a result, it is intended to reduce the time required for exchanging the molds and thereby to improve the production efficiency.

[0005]

SUMMARY OF THE INVENTION In order to solve this problem, an injection mold changing system according to the present invention employs an injection molding machine in which a mold to be used next is scheduled to be used before the end of the production of a mold currently in use. A step of inputting the setting conditions of the mold, a step of setting the mold to be used in the mold exchanging car, and a step of taking out the mold to the mold exchanging car by the end of the production of the mold in use. And carrying the mold to be used into the injection molding machine from the mold exchanging cart and setting it.

[0006] According to the mold exchanging system having the above-described configuration, the conditions for setting the mold to be used next to the injection molding machine are input in advance before the end of the production of the currently used mold. The input operation of the setting condition of the next die after the end of the production by the die becomes unnecessary. In addition, due to the development and use of the mold exchange cart, the mold exchange work is carried out smoothly. If the former mold and the next mold are produced from the same resin material as the mold exchange time is shortened, purging work (removal of remaining material) Omission / reduction of) is also expected.

In this mold exchanging system, the next mold setting condition input in the input step includes at least one of a mold thickness dimension of the next mold and a mold opening position of a parting line surface. desirable. This improves the work efficiency when removing the finished mold from the injection molding machine and setting the next mold to be used in the molding machine, and smoothly transitions to the start of production with the set mold. You can do it.

In the mold exchanging cart, a receiving stand for a mold currently in use by an injection molding machine and a stand-by stand for a mold to be used next are arranged side by side on a horizontally movable table. It is preferable that each of the mold receiving table and the standby table is provided with a positioning mechanism for carrying the mold in and out of the injection molding machine, and a mechanism for carrying the mold in and out of the injection molding machine. As a result, the finished mold is carried out of the injection molding machine and the next used mold is carried into the molding machine quickly, and the effect of the present invention is enhanced.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a plan view schematically showing the overall configuration of an injection mold changing system according to one embodiment of the present invention, FIG. 2 is a front view of a mold changing truck in this system, and FIG. 3 is this system. 1 shows a schematic configuration of an injection molding machine and a mold exchanging cart in FIG. As shown in these figures, a mold exchanging trolley 20 used in this system is placed beside the injection molding machine 10 shown by a virtual line.

In the mold exchanging cart 20, a pair of rails 24 are laid on a frame 22.
A table 26 on which dies are placed is provided on the plates 4 and 24 so as to be movable in the horizontal direction. The table 26 is moved by the operation of a handle 28 provided on one side of the bogie 20 as shown in FIG. 4, and the tip of the lever shaft is moved by the operation of the table movement lock clamp lever 30. Of the table 26
Movement is regulated.

The table 26 is provided with two sets of mold mounting spaces, one of which is a mold (front mold) Dp which is currently set in the injection molding machine 10 and is being used. Receiving table 3 when taken out of injection molding machine 10
The other is a stand 34 for a mold (next mold) Dn to be set and used in the injection molding machine 10 next. All dies are indicated by phantom lines. Note that the positions of the receiving table 32 and the standby table 34 may be reversed depending on the use situation.

The receiving table 32 of the former die carried out of the injection molding machine 10 and the standby table 34 of the next die to be next carried into the injection molding machine 10 have the same configuration. To explain, this reception table 3
In the rear half of the table 2 in the forward and backward directions, a pair of conveying rollers 38 for carrying in and out the mold toward the injection molding machine 10 are arranged in parallel between the pair of bearing plates 36.

At the front end of the table moving direction opposite to the conveying roller group 38, a metal mold for restricting the displacement of the mold mounted on the conveying roller group 38 in the table moving direction is provided. A mold stopper plate 48 is erected, and a front mold Dp or a next mold Dn is provided on the inner surface of the mold stopper plate 48.
Guide groove 50 in the flange portion formed on one end face of
Are provided integrally.

As shown in FIG. 5, a lock claw 52a which is moved up and down by operation of the mold stopper opening / closing lever 52 is provided in the gap between the roller groups 38, and when the lock claw 52a is raised. The lock on the mold is released, and the flange portion of the mold is slidably mounted in a slide guide groove 50 formed on the inner surface of the mold stopper plate 48.
The lifting / lowering movement of a is stopped.

The mold exchanging cart 20 is moved by a pair of urethane rubber front wheels 56 and rear wheels 58. A pedal lock 60 is connected to the rear wheels 58, and the pedal lock 60 is depressed with a foot. This restricts the rotation of the wheel. On one side surface of the frame base 22 of the carriage 20, a carriage stopper 62 for restricting the movement of the carriage is provided so as to be freely disengageable from an arm frame 64 extending in the horizontal direction. A carriage positioning lever 66 provided on the front side of the platform 22 is connected.

By operating the carriage positioning lever 66, the carriage stopper 62 is engaged with the arm frame 64 to be locked, or the lock is released. The movement of the bogie positioning lever 66 is regulated by the operation of the lock plunger 68.

The mold exchanging trolley 20 is a frame base 2
The mold pull-out rod 4 which is moved by hand with the handling handle 46 provided on the rear side of the mold 2 and used for carrying out the mold from the injection molding machine and carrying it into the injection molding machine.
4 is mounted on the frame base 22.

On the other hand, although not shown, by operating the operation panel (control panel) of the injection molding machine 10, the production conditions of the molded product currently being produced, for example, the resin weight of the molded product, the number of shots (the number of production), the injection number, In addition to the input of molding temperature, injection pressure, etc., the setting conditions for the mold (next mold) to be used for the next production to the injection molding machine, such as the mold thickness dimension of the next mold, the parting line surface ( The mold opening position of the (PL plane) can be set. Further, it is possible to input production conditions such as resin weight, shot number (production number), injection molding temperature, injection pressure, etc. of the molded product of the subsequent mold.
As will be described later, by setting the mold thickness dimension of the next mold and the mold opening position on the parting line surface, automation of the mold clamping work on the injection molding machine is achieved.

In the mold changing system for injection molding according to the present invention, as shown in FIG. 6, the flow of the mold changing operation is shown in FIG.
During the production, the conditions of the next mold are inputted by the control panel panel, and the setup of the next mold is advanced simultaneously.

The "next die condition" input to the control panel panel includes a resin weight of a molded product produced by the next die,
In addition to the injection molding temperature, injection pressure, number of shots (production number), as a condition for changing the mold, the thickness of the next mold required for setting in the injection molding machine, the mold opening position on the parting line surface, etc. Is included. In the “setup of the next mold”, the mold exchange trolley 20 is mounted on the injection molding machine 10 while the next mold Dn is placed on the standby table 34 of the mold exchange trolley 20.
It is done by laying next to

At this time, when the mold receiving table 32 of the mold exchanging carriage 20 is used to unload the front mold Dp currently used by the injection molding machine 10 from the molding machine, a flange portion provided on one side of the front mold Dp. At a position corresponding to a slide guide groove 50 formed along a metal stopper plate 48 provided near one side edge of the receiving table 32 by operating the handle 28 and the movement locking clamp lever 30. The position of the table 26 is fixed. The operation of the carriage positioning lever 66 causes the carriage stopper 62 to operate the carriage 2.
The position 0 is locked, and the lock plunger 68 is positioned and fixed so that the carriage 20 itself cannot be moved.

Next, when the production of the front mold Dp is completed by the injection molding machine 10, the mold is replaced. At this time, the injection is performed by pressing a step button provided on the control panel of the injection molding machine 10. The injection unit of the molding machine 10 is retracted, and the unloading operation of the mold clamping unit is automatically performed.

Then, the operator (operator) is instructed to attach the purge cover to the control panel, so that the purge cover is attached to the fixed platen and then the step button is pressed to perform the purge operation (removal of the remaining material). Be started.

During the purging operation, the operator pulls out the front die Dp in the injection molding machine 10 by using the die pulling bar 44 by the transport roller group 38 on the receiving table 32 of the table 26 on the carriage 20. At this time, the flange portion of the front mold Dp is drawn out along the metal stopper plate 48 and the slide guide groove 50 provided on the receiving table 32. FIG. 2 shows a state in which the front mold Dp is pulled out onto the metal receiving table 32 by a virtual line.

When the front mold Dp is carried out onto the receiving table 32 of the cart 20, the operator next operates the handle 28 to move the table 26 on the cart 20 along the rails 24, 24, and the next mold Dn. Is fixed by the movement locking clamp lever 30 at the position where the standby table 34 on which is mounted is just at the position where the next mold Dn is carried into the injection molding machine 10. As a result, the next mold Dn placed on the mold standby table 34 moves to the position of the front mold Dp indicated by a virtual line in FIG.
The front mold Dp on the mold receiving table 32 is moved to the position of the mold Dp ′ indicated by a virtual line in FIG.

Next, when the operator presses the step button, the mold clamping unit of the injection molding machine 10 starts preparing for carrying in the next mold. By pushing the mold Dn into the injection molding machine 10, the next mold Dn is carried into the injection molding machine 10 by the conveying rollers 38 on the mold stand 34.

When the preparation for carrying in the mold clamping unit is completed, the operator presses the step button to automatically perform the operation of the mold clamp in the mold clamping unit. Since the purge (removal of residual material) is completed in the injection unit during the mold clamping operation, the operator next presses the step button to move the injection unit to the next mold Dn carried into the injection molding machine 10. Then, the resin injection nozzle is stopped when the resin injection nozzle touches the purge cover, and then the resin injection amount for one shot is measured by using the back pressure. When the weighing is completed, the injection unit is retracted, and the purge cover is removed there. The operation of the step button in this work is enabled after the end of the mold clamp is confirmed,
This ensures system stability.

When the mold exchanging operation is completed in this way, the worker starts production by switching from the mold exchanging mode to the normal mode. Since the resin weight and the like of the injection-molded product by the newly set mold have already been input to the injection molding machine, the non-defective product is produced from the first shot of the production start.

As described above, according to this mold exchanging system, during the production by the injection molding machine, the setting conditions of the mold to be used next are input in advance, and the mold to be used is inputted. By setting it on the mold changing carriage and laying it sideways on the injection molding machine, the time can be saved as the mold changing time.

The mold exchange is automatically performed by the button operation of the control panel panel from the unloading of the die after the production, the loading of the next die to be used, and the clamping operation of the die to the die clamping unit. Since it is performed, it is sufficient for the worker to take out (carry out) the used mold from the injection molding machine and carry in the mold to be used next as work. Therefore, the labor burden of the worker is considerably reduced.

By the way, the setup time of the mold exchanging work was reduced from 60 minutes (1 minute) to 60 seconds (1 minute) by using this system. In addition, although two people were required for the mold exchanging work in the past, one man's work was sufficient, which led to a reduction in the number of personnel.

Further, in the setup work, individual differences are eliminated by eliminating the steps requiring special skills, and furthermore, the safety in the mold changing work is improved by systematization and automation.

The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the gist of the present invention. For example, in the above embodiment, the mold receiving stand and the mold standby stand on the mold exchanging cart are provided on one table, but they may be separately provided. In addition, although the transfer of the mold into and out of the injection molding machine is performed by the transport roller, it may be performed by a cylinder mechanism (using a pusher or the like).

[0034]

According to the mold exchanging system for injection molding of the present invention, as described in claim 1, during the production by the injection molding machine, the condition for setting the mold to be produced next to the molding machine is set. Since the mold is input in advance and the mold is set on the exchange cart, the carry-out to the mold exchange cart and the carry-in of the next mold are performed promptly at the end of the production of the previous mold. It is possible to shorten the setup work of the replacement work, reduce the number of workers and eliminate individual differences in the setup work, and have the real benefits of improving the safety by systematizing and automating the mold replacement work. Things.

By adopting the mold thickness dimension of the next mold or the mold opening position of the parting line surface as the input parameter of the mold setting condition to the injection molding machine, the mold is formed. The automation of the mold changing operation can be effectively advanced. Further, as described in claim 3, the effectiveness of this system is further achieved by the development and use of the mold exchanging cart used.

[Brief description of the drawings]

FIG. 1 is a plan view showing an overall schematic configuration of an injection mold changing system according to an embodiment of the present invention.

FIG. 2 is a front view of a mold changing cart in the system.

FIG. 3 is a schematic configuration diagram of an injection molding machine and a mold exchange cart in this system as viewed from the side.

FIG. 4 is a sectional view taken along line AA in FIG. 2;

FIG. 5 is a sectional view taken along a line BB in FIG. 2;

FIG. 6 is a diagram showing a flow of a mold exchanging operation in this system.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Injection molding machine 20 Die change trolley 32 Receiving stand 34 Standing stand 38 Conveying roller group 48 Die stopper plate Dp Front die (die being used) Dn Next die (die to be used next)

Claims (3)

[Claims] 1. A step of inputting setting conditions of a mold to be used next before the end of production by a mold currently in use by an injection molding machine, and transferring the planned mold to a mold changing carriage. A setting step, a step of taking out the mold to the mold exchanging truck when the production of the mold in use is completed, and carrying the mold to be used from the mold exchanging cart into the injection molding machine and setting it. A mold exchanging system for injection molding, comprising: 2. The next die setting condition input in the input step includes at least one of a die thickness dimension of the next die and a die opening position of a parting line surface. 2. The mold changing system for injection molding according to 1. 3. The mold exchanging trolley has a receiving stand for a currently used mold and a stand-by stand for a mold to be next used on a horizontally movable table. 2. The mold receiving stand and the stand-by stand each include a positioning mechanism for loading / unloading the mold to / from the injection molding machine and a mechanism for loading / unloading the mold to / from the injection molding machine. Or the mold changing system for injection molding according to 2.