JPH03164221A - Injection molding machine and method - Google Patents

Abstract

PURPOSE:To reduce complicated mold replacing work and to shorten a required time by arranging a mold opening and closing mechanism allowing a movable die plate to come close to or go away from a fixed die plate to a revolving table and arranging a revolving table lift apparatus under the revolving table. CONSTITUTION:When a moving mold 8' is closed to open a fixed mold 8 from a fixed die plate 1, the molds 8, 8' are held to a movable die plate 2. The movable die plate 2 is opened to be moved and a clamping mechanism B is driven to allow a tie bar 7 to escape by a retraction stroke L. When a revolving table 6 is revolved by 180 deg., the movable die plate 2 and the molds 8, 8' are opposed to a mold standby apparatus 15. A mold opening and closing mechanism A is driven to move the movable die plate 2 to the mold standby apparatus 15. When the revolving table 6 is properly raised by a revolving table lift apparatus E, the under surfaces of the molds 8, 8' inclined forwardly in a downward direction becomes higher than the receiving surface of the mold standby apparatus 15 and the giving and receiving of the molds 8, 8' can be smoothly performed between the movable die plate 2 and the mold standby apparatus 15.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to an injection molding machine (or die casting machine included; the same applies hereinafter) used for injection molding of synthetic resins and an injection molding method using this injection molding machine. More particularly, the present invention relates to an injection molding machine and an injection molding method that are suitable for easy mold replacement in the field of injection molding where frequent mold replacement is required. Conventional technologyIn the field of injection molding, there is an increasing demand for high-mix, low-volume production. For example, it is not uncommon for a single injection molding machine to be forced to change molds as often as five times a day. Therefore, regarding injection molding machines,
Facilitating mold replacement work, automating it, shortening the required time, and reducing costs are major development issues. ■ Is this the way it used to be? :To accomplish one problem,
For example, the injection molding machine described in Japanese Patent Application Laid-Open No. 60-82309 has a structure in which the movable die plate is completely detached from the tie bar that has been attached to the stationary die plate, and is unraveled to move the mold wide open. ing. Immediately before the movable die plate approaches the stationary die plate and the dual-force mold is closed, a locking means such as a half nut is provided to lock the movable die plate and the tie bar. The structure allows for strong mold clamping. Therefore, by moving the movable die plate, which has been completely released from the tie bars, to open the mold as much as necessary, it is possible to change the mold horizontally without being obstructed by the tie bars. The injection molding machine described in Japanese Patent Publication No. 41-6794 opens and closes the movable die plate using a high-speed extraction cylinder. The movable die plate can be freely connected to and detached from the tie bar using a half nut, and a clamping cylinder is constructed at the connection between the tie bar and the stationary die plate. 4. The injection molding machine described in Publication No. 50-28974 also opens and closes the movable die plate using a high-speed hydraulic cylinder. The movable die plate can be freely connected to and detached from the tie bar using a half nut, and the movable die plate has a clamping cylinder attached to it. All of the injection molding machines mentioned above are configured so that mold changes are performed only in the lateral force direction of the molding machine. ■ The mold changing device described in JP-A-50-117077 is provided with mold holding mechanisms in the form of C-shaped channel steel on the movable and stationary die plates so as to face each other in the horizontal and lateral directions; This mold holding mechanism is equipped with an extraction pressure-driven locking mechanism using a so-called wedge mechanism that fixes each mold in a predetermined position. A mold moving mechanism is installed to prepare the assembled mold or to carry away the removed previous mold, and the mold is moved horizontally between the molding machine and the mold moving mechanism. It is said to have a structure in which a mechanism for putting in and taking out gold coins is installed. Japanese Patent Application Publication No. 58-222827 and actual opening/closing No. 60-1375
The mold changing device described in Publication No. 16 is also configured to change the molds of an injection molding machine horizontally and horizontally. ■Next, the injection molding machine described in the specification and drawings of Japanese Patent Application No. A mold opening/closing mechanism that moves the plate toward or away from the stationary die plate, a mold clamping mechanism that clamps the closed mold with high thrust, and an injection device, with at least 90 The movable die plate is installed on a swivel table that is capable of rotating by 1° and is equipped with a guide for moving the movable die plate. A swivel drive mechanism is installed on the swivel base. The movable die plate is equipped with a removable locking device attached to the tie bar attached to the stationary die plate. A mold opening/closing mechanism for moving the movable die plate toward or away from the stationary die plate is installed on the swivel table, making it easy to replace the molds in the mold waiting machine. Five problems to be solved by the present invention I) The conventional injection molding machine and mold exchange device described in (1) and (2) above have problems when replacing the old mold attached to the die plate and the next one. It is essential that the new mold to be installed be moved in and out of the wood plate safely, accurately and reliably, using a mold loading/unloading mechanism or a transfer device, for example. Therefore, the structure of the mold changing device and drying process become complicated, and automation is difficult. Since the mold is temporarily replaced in the horizontal direction of the injection molding machine, depending on the arrangement of the injection molding machines in the injection molding factory, the distance between adjacent molding machines may be narrow. There were drawbacks and problems, such as in some cases it was impossible to implement because it was not possible to insert trolleys, etc. (2) The injection molding machine described in the prior application iAH mentioned in (2) above has the advantage that the mold can be transferred directly to and from the mold standby device by using a swivel table. However, when a pair of movable molds and fixed molds are combined into one set and supported cantilevered on the movable die plate for mold replacement, the mold guide bin 22 and the bin into which it fits, as shown in Figs. Due to the gap between the hole 23 and the fixed mold 8, there is a tendency for the fixed mold 8 to be slightly lower than the movable mold 8'. In particular, there are cities where the stationary mold 8 gets stuck (contacts) with the mold standby device 315 or the mold storage area and cannot be transferred or received properly. Furthermore, in order to reduce the overall length of the injection molding machine according to the prior invention, a configuration is adopted in which the stationary die plate and tie bars are moved back to a position where they do not interfere with the rotation of the movable die plate. but. Not only is the mechanism too large and the structure 81 complicated, but it also requires complicated means for positioning and fixing the stationary die plate. In addition, it is often not possible to install a movable mold standby device in production factories due to cost and factory operating methods, so these points should be resolved a! It has become a problem. Means for Solving the Problems (First and Second Issues IJI) As a means for solving the problems of the above-mentioned prior art, the injection molding machine according to the present invention has a fixed metal y as shown in the embodiment in the drawings. ! A fixed die plate l that holds J18,
A movable die plate 2 that holds the movable die 8', a mold opening/closing mechanism A that moves the movable die plate 2 toward or away from the stationary die plate t, and a mold opening/closing mechanism A that raises the closed die. Mold clamping mechanism B that clamps the mold by thrust and injection device 5!14
In the injection molding machine which is very popular, a) It is possible to turn at least 90'
A guide l8 for moving the movable die plate 2 was provided on the swivel base 6 on which the mechanism C was installed, and a movable die plate z was installed. ) The moving die plate 2 has a fixed die plate l.
A removable locking device D was installed on the typer 7 attached to the holder. c) A mold opening/closing mechanism A was installed on the swivel table 6 to move the movable die plate 2 closer to or away from the stationary die plate 1. 2) A swivel platform elevating device 21E is installed below the swivel platform 6. The injection molding machine of the present invention is also provided with a mold clamping piston 17 at the base end of the typer 7 attached to the stationary die plate l, and the mold clamping piston l7 is installed in the mold clamping cylinder l6 to clamp the mold. Mechanism B was configured. And mold clamping cylinder l6
Another feature is that the mold clamping piston l7 is formed to a size (length) that allows the backward stroke L required for the typer 7. The operating IL device 210 is released from the typer 7, and the movable die plate 2 is moved backward by a predetermined stroke by the opening/closing mechanism A to perform the mold opening process. When the movable die plate 2 is moved forward by the mold opening/closing mechanism A, the tieper 7 is passed through the through hole 2a of the movable die plate 2. If the typer 7 is locked using the locking device ID just before the mold is closed, the reaction force of mold clamping can be removed. Therefore, after the mold is closed, the mold is clamped by the mold clamping mechanism B, and the injection molding process can proceed. To replace the molds 8 and 8', first close the movable mold 8 and release the fixed mold 8 from the fixed die plate 1, then the pair of molds 8 and 8' are replaced with the movable die plate 2. is maintained. Therefore, the movable die plate 2 is moved to open the mold, and the movable die plate 2 is released from the tieper 7 and opens the mold to a predetermined stroke. Simultaneously or in parallel, the mold clamping mechanism B is driven to close the tieper 7. Only the backward stroke L is released. After that, when the swivel table 6 is rotated, for example, by 180', the movable die plate 2 and the molds 8, 8' take an outward posture so as to face the mold standby device 2t (or mold exchange table) 15. ．． Therefore, if necessary, the movable die plate 2 is moved closer to the mold standby device i15 by driving the mold opening/closing mechanism A. In addition, the swivel platform elevating equipment f
When the swivel table 6 is moved appropriately 4;}1 using iE, the lower surfaces of the molds 8 and 8', which are tilted forward and downward as shown in Fig. 2.3, will be higher than the receiving surface of the mold standby device 15. The molds 8, 8' can be smoothly exchanged between the movable die plate 2 and the mold standby device 15. By selectively controlling the turning angle of the turning table 6 in accordance with the position of the mold standby device 15, the molds 8, 8' can be exchanged in a wide range of directions not only horizontally and laterally of the injection molding machine but also backwardly. (Third Invention) The injection molding method using the injection molding machine described above includes a plurality of preset molds 91 to 94 around the swivel table 6, as shown in an embodiment in FIG.
The mold, which has undergone the injection process using the molding machine, is lowered to a predetermined position using the swivel table 6 for the cooling process. Then, the mold is replaced by attaching the mold of the next rank to the molding machine, and the process of taking out the molded product by opening the mold and performing the injection process is performed on this mold of the next rank. Function: For example, in the case of molded products that require a long cooling time, such as foam molded products, the necessary and sufficient cooling time can be achieved by placing the molding mold on the mold standby equipment fil5 after the injection process. Cooling can be done in between. During this time, the molded product can be taken out and the injection process can be performed using a different mold for molding, and the actual molding cycle can be shortened using the rotary method, which improves the operating efficiency and productivity of the molding machine. It is possible to improve the Embodiment Next, an illustrated embodiment of the present invention will be explained. Figure 1 shows
The injection molding machine according to the present invention is shown with the movable die plate 2 opened. This injection machine is fixed metal y
f! The stationary die plate 1 holding the (female mold) 8 with the mold clamping device 3 and the movable die plate 2 holding the movable mold (male 5) 8' with the mold clamping side 3 are given A penalty. An injection device 224 facing the fixed mold 8 is attached to the stationary side die plate 1 (although most of it is not shown). The fixed die plate 1 and the movable die plate 2 are constructed by passing the tieper 7 attached to the fixed die plate 1 into the through hole 2a of the movable die plate 2, and attaching it to the back of the movable die plate 2. For example, the locking device D using the extracting pressure drive nut 5 placed at the l'j
By engaging the tip (threaded portion) of the tieper 7 inserted into the through hole 2a, a reaction force sufficient to withstand the mold clamping pressure during the molding process is obtained. The stationary die plate 1 is equipped with a hydraulic mold clamping mechanism B using a mold clamping cylinder 16 which is provided at the right end (base end) of the tieper 7 and contains a large diameter mold clamping piston l7. Therefore, the staff 21
0 locks the typer 7 to close the mold, and during the mold clamping process, by sending hydraulic pressure to the mold clamping cylinder l6, a strong mold clamping pressure sufficient to withstand the injection molding positive force is applied to the pair of molds yl28,a'
can be added to. The mold clamping cylinder 16 has a size (length) that allows for a trailing stroke L to allow the tie bar 7 to escape to a position where the tie bar 7 does not interfere with the rotation of the moving die plate 2 and the molds 8, 8'. It is formed. The fixed die plate l is attached to the molding machine base l9-1:
It is fixed at the left end in the figure. The swivel table 6 is installed on the swivel table lifting device E.
Swivel platform lift i! The tE is a 4I configuration with a base 20 and a hydraulic jack 2L oriented in 12 vertical directions. The non-rotating large south wheel 13 is supported by the output shaft of the extraction jack 2l,
A swivel base 6 is installed inside the large south car 13 via a pole bearing 25 so that it can rotate 360 degrees. A movable die plate 2 is installed on the rotating table 6. On the two sides of the swivel table 6, there is a layered motion guide (bed) 18 for movement.
18 (Fig. 4), and the movable die plate 2 is installed so as to slide on it along the Fti line. At the bottom of the turning joint 6 is a binion 12 that meshes with the large gear l3.
A turning motor l2 that rotationally drives the rotor a is fixed, thereby forming a turning drive mechanism C that turns the turning table 6 to an arbitrary angle. -1 of turning f76:. In the section, a pole screw shaft l1 for opening and closing the mold is installed parallel to the movable river sliding guide l8 so that it can only rotate.
A parent nut that engages with the moving die plate 2 is provided on the moving side die plate 2. The pole screw ill is rotated by a mold opening/closing motor 10 fixed to the swivel base 6, and a mold opening/closing mechanism A is constructed which causes the movable die plate 2 to approach or move away from the fixed die plate l. Molded product 1 after the injection molding and cooling process [g] To open the mold for ejecting, first loosen the mold clamping mechanism B and release the locking device D from the tieper 7. Next, when the mold opening/closing motor 10 is started to rotate normally, the movable die plate 2 separates from the tie plate 7 and moves backward to the left in the figure, where it is inserted into the thick mold IJH and reaches the mold open state in Figure 1. Then, the hollow part is taken out. When the mold opening/closing motor 10 is started in reverse after taking out the molded product, the movable die plate 2 moves forward to the right in the figure to face the mold closing, and the typer 7 moves to the page through hole 2a.
1. Become divinely enlightened. Therefore, just before the mold is closed, the typer 7 is locked again by the locking device D, and the mold clamping process by the mold clamping mechanism B is started. Gold, fi8. 8', a mold standby device (stand) 15 for transferring molds is installed at the rear (or side) of the swivel table 6 of the injection molding machine (4th. (See Figure 5). The mold standby device 15 is a stand that is at the same height as the lower surface of the pair of molds 8 and 8' held on the moving die plate 2, and is used to hold the next ship's standby mold (preset die) set in advance. 9 and wait for the model to be changed.
For the 1,000 sets of mold replacement, first close the pair of molds 8 and 8'. Then, the guide bin 22, which has been projected in advance from the movable die plate 8' in parallel with the tieper 7, fits into the guide hole 23 of the stationary die. Therefore, when the mold clamping device 3 is released and the fixed mold 8 is separated from the fixed die plate 1, the pair of molds 8 and 8' are clamped into one piece via the guide bin 22. The assembled state is held on the movable die plate 2 (Second.
Figure 3). In order to actively separate the fixed mold 8 from the fixed die plate 1, a plurality of mold release springs 24 are installed on the fixed mold mounting surface of the fixed die plate 1. The movable die plate 2 holding a pair of molds 8, 8' is opened by a mold opening/closing mechanism A to a position approximately above the center of rotation. At the same time as this movement, or before and after this movement, the mold clamping piston 17 of the mold clamping mechanism B is moved to the rightward limit as shown in FIG. Therefore, the moving die plate 2 and the pair of molds 8, 8' held therein are
By the amount of the stroke L that the typer 7 escapes by retreating to the right in the figure, it can turn on the swivel table 6 at a position on the right side in Figure 2, and the mold opening stroke of the moving die plate 2 can be reduced. ．． Moreover, after turning 1800 degrees, the movable die plate 2 and the molds 8, 8' are located closer to the mold standby device l5, which is convenient (Fig. 3). Start the motor 12 of the swing drive mechanism C and set the swing angle 6 to t.
When turning ao', the moving side die plate 2 and the mold 8
, 8' are in a posture and direction facing the mold standby device l5 as shown in FIG. At this point, the mold opening/closing motor 10 of the mold opening/closing mechanism A is started again, and the movable die plate 2 is moved in the direction approaching the mold converting device 15. Simultaneously with this movement, or in succession, drive the swivel platform lifting device E,
After adjusting the lower surfaces of the pair of molds 8 and 8' held by the moving die plate 2 to be slightly higher than the receiving surface of the mold standby device fil5, the pair of molds 8 and 8' are Type standby equipment ii! Bring it to the position directly above Il5. After that, the mold clamp device t3 is released and the movable die plate 2 is moved.
When the moving mold 8' is separated from the old pair of molds 8.8
' is passed to the mold standby equipment fil5. This pair of molds 8 and 8' are moved away from each other as indicated by arrows A and B in Fig. 4. In order to actively separate the movable mold 8' from the movable die plate 2, a plurality of gI type springs 24 are provided at the mold attachment point of the movable die plate 2.
is installed. On the other hand, the preset standby gold plate 9 of the next rank, prepared in advance on the die standby device i15, is advanced one position as shown by the arrow/X (Fig. Type clamp equipment i! It is held by I3.
After this, the mold opening/closing motor lO is started and the movable die plate 2 is moved backward to approximately the center of rotation (Fig. 3). Then, the swivel table lift IE lowers the swivel table 6 to its original level (f).Next, the swivel motor 12 is started, and the swivel table 6 is rotated tao' to move the movable die plate 2 to the stationary die plate. (Fig. 2).The motor 10 of the mold opening/closing mechanism A is started again to move the movable die plate 2 to close the mold, and the fixed mold 8 is moved to the captive die plate. 1 and held by the mold clamping device 3 to the fixed side die plate l, the mold replacement work If;B is completed.The second embodiment, FIG. As a preferred method of using the injection molding machine, there are four mold storage areas (or a mold waiting device 15 is installed in each position) at positions roughly dividing the periphery of the swivel table 6 into four.The same applies hereinafter. ), and a maximum of four preset molds 9l to 94 are placed there so that the molds can be replaced.In Fig. 5, the molds are 9!→
It shall be used in a rotary manner in order of n of 94. The mold 91 has just finished its injection process and started its cooling process on the mold standby device, and the next mold 92 is received by the moving die plate 2 as having completed its cooling process.
Then, the fixed mold 8 is held in the fixed die plate 1 in the manner described above, and the molded product is taken out by the mold opening process and the injection process follows. During this time, the other molds 9394 and 9+ are given a necessary and sufficient cooling period, which is convenient for high-quality molding of molded products that require a long time between moldings, such as foamed molded products, and allows the molding machine to effectively operate. Efficiency can be increased. In addition, this working force method is convenient for efficient and rational mold replacement in molding plants where frequent mold changes are required. The effects of the present invention II are as described in detail in conjunction with a practical example. The function of the opening/closing mechanism A is effectively used to transfer money between the mold standby device 15 and the mold standby device 15! l! ! 8. 8
' can be exchanged directly, and molds can be exchanged easily, quickly, and safely as an almost automated process, reducing the burden of frequent mold replacement work and shortening the required time. The productivity ratio will reach 12. Moreover, by utilizing the swivel table 6, the molds 8 and 8' can be easily replaced not only horizontally and laterally of the injection molding machine, but also backwards, etc., by selecting the force direction of the machine itself. Even in a factory, regardless of the arrangement of the injection molding machines, by finding an empty space and installing the mold standby device 15 in that location, molds can be replaced flexibly, making it highly adaptable. ．． In addition, by placing multiple molds around a swivel table that can be changed, a movable mold standby device can be omitted, making it possible to automatically exchange multiple molds at low cost. On top of that,
In the case of molds for molded products that require a long cooling time, such as foam molded products, molding can be performed using a separate mold during the cooling process after injection, which is very economical and allows for faster operation. This allows for the use of highly efficient machinery.

[Brief explanation of the drawing]

Figures 1 to 3 show the ejection rig 2 of the ejection command aircraft related to this departure I.
Fig. 4 is a plan view showing the mold opening state with one part omitted, and Fig. 5 is a plan view showing the mold opening state in another example. FIG. 8...Fixed mold 8'...Movable mold A...Mold opening/closing mechanism 4...Injection device 6...Swivel attachment 7...Tie/heel...Fixed side die Plate 2...Moving side die plate B...Mold clamping mechanism l8...Moving sliding guide C...Swivel drive mechanism D...Locking device E...Swivel platform lowering device l7 ... Mold clamping piston 1 6 ... Mold clamping cylinder 9 to 94 ... Extraction cylinder

Claims (1)

[Scope of Claims] [1] A fixed die plate that holds a fixed mold, a movable die plate that holds a movable mold, and a movable die plate that is moved closer to or further away from the fixed die plate. In an injection molding machine consisting of a mold opening/closing mechanism for closing the mold, a mold clamping mechanism for clamping the closed mold with high thrust, and an injection device, a) the rotation drive mechanism is capable of rotating at least 90 degrees; A guide for moving the movable die plate is installed on the installed swivel base, and the movable die plate is installed, and (b) the movable die plate has a removable engagement with the tie bar attached to the fixed die plate. c) The swivel table is equipped with a mold opening/closing mechanism that moves the moving die plate closer to or away from the stationary die plate, and d) The swivel table has a mechanism for lifting and lowering the swivel table. Injection molding machines each characterized by having a device installed therein. [2] A mold clamping piston is provided at the base end of the tie bar attached to the stationary die plate, and the mold clamping piston is installed in a mold clamping cylinder to constitute a mold clamping mechanism. 2. The injection molding machine according to claim 1, wherein the cylinder is formed in a size that allows the mold clamping piston to make a backward stroke required for the tie bar. [3] A plurality of preset molds are arranged around the swivel table, and after the injection process by the molding machine, the molds are lowered to a predetermined position using the swivel table for the cooling process. Then, replace the mold by attaching the next mold to the molding machine,
An injection molding method using an injection molding machine as set forth in claim 1 or 2, characterized in that the step of taking out the molded product by opening the mold and injecting the next mold is performed.