JPH0327013B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a molding machine, and particularly to a hollow mold assembly that continuously performs a series of mold fixing/releasing operations and mold opening/closing operations.

[Conventional technology]

A conventional blow molding die assembly includes a bottom plate 1, a plurality of upper plates 2, and fixed plates 3 and 4 on both sides, as shown in FIGS. 1 and 2, respectively, in a partially cutaway front view and a plan view. Fixed to each other, the fixed plate 3,
Tie bars 5, 5 are arranged between movable plates 6, 7.
is attached movably along the tie bars 5,5. Hydraulic cylinders 8, 8 are fixed to both ends of one movable plate 6, rods of hydraulic cylinders 8, 8 are fixed to the other movable plate 7, and molds are fixed to the movable plates 6 and 7. A pair of constituting cavity halves 9 and 10 are each fixed.
Further, a bottom cavity 11 is fixed to the bottom plate 1.

In the blow molding die assembly configured as described above, when the pair of cavity halves 9 and 10 are open (FIGS. 1 and 2 show the closed state), one of the hydraulic cylinders 8 and 8 is closed. When pressurized oil is sent to the oil chamber, each movable plate 6, 7 moves toward each other in the closing direction, and the pair of cavity halves 9, 10
comes into contact. In other words, mold closing is completed in this state. Simultaneously with the start of this mold closing operation, a parison (not shown) is supplied between the molds from between the plurality of upper plates 2. The clamping force is provided by generating a force in the hydraulic cylinders 8, 8 that is greater than the projected area of the product engraved shape of the mold cavity multiplied by the feeding pressure, which is generated in the mold during molding. This makes it ready for molding. When the molding process is completed, pressure oil is sent to the other oil chamber of each hydraulic cylinder 8, 8 to open the mold.

Generally, most of the products of such a blow molding die assembly are plural. In this case, if the conventional device has multiple mold cavities, for example, if the mold cavities of the mold are made in a single row, the reaction force of the feeding pressure will be applied to each mold cavity, as shown in Fig. 3. Since a deflection δ/2 (see Fig. 4) is likely to occur in the center of the cavity halves 13 and 14, it is necessary to make each cavity half 13 and 14 a rigid body with high rigidity. The half parts 13 and 14 are large and heavy, and the mold as a whole becomes large. code 15 here
indicates a hydraulically actuated device.

Furthermore, as shown in Fig. 5, even when the mold cavities are arranged in multiple rows, the same problems as in the case of multiple single rows may occur, and the distance between the mold rows is
becomes considerably large.

[Problem that the invention seeks to solve]

When a mold assembly with mold cavities in multiple single rows and multiple rows in this way is installed in a molding machine,
There is a problem that the entire molding machine becomes large. Furthermore, in molding systems, the alignment bit distance of the tempering section, molding section, and product ejection section associated with the enlarged mold assembly increases, which increases the travel time of each gripper device, which is disadvantageous in the efficiency of the molding operation. There is a problem.

The present invention has been made in view of the above-mentioned problems of the conventional technology, and by reducing the deflection of the cavity half during the molding process, the molds can be used even when the molds are arranged in multiple rows. An object of the present invention is to provide a hollow mold assembly that has a compact form that keeps the distance between rows small and improves the efficiency of molding work.

[Means for solving problems]

To achieve the above object, the present invention provides a mold comprising a pair of cavity halves in at least one row;
A blow molding die assembly including a bottom plate and a top plate disposed below and above the die, respectively, and a connecting member that integrally connects the bottom plate and the top plate, the gap between the bottom plate and the die and the gap between the bottom plate and the die. a lower fixing plate and an upper fixing plate each having an opening for supplying the parison, respectively arranged between the upper plate and the mold;
A guide means for vertically movably guiding the lower fixing plate and the upper fixing plate with respect to the bottom plate and the upper plate, respectively, and a length of the mold on the lower surface of the upper fixing plate and the upper surface of the lower fixing plate. Grooves are formed along the mold direction and can fit into the upper and lower outer circumferential surfaces of the mold when the mold is in the closed state, respectively, and the lower fixing plate and the upper fixing plate are connected to The grooves are moved in opposite directions relative to the mold to fit the upper and lower outer circumferential surfaces of the mold in the mold closed state into the grooves formed in the upper and lower fixing plates, respectively. a mold fixing/releasing device having a driving means; a supporting member for supporting the mold in an openable/closable manner; and a mold fixing/releasing device having a drive means; The present invention is characterized by comprising a mold opening/closing device having a second drive means for moving the molds in opposite directions to open the mold.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings.

In FIGS. 7, 8, and 9 showing a partially cutaway side view, a cross-sectional view, and a partially cutaway front view, respectively, of an embodiment of a blow molding die assembly according to the present invention, this embodiment has two rows. x4 8-cavity hollow mold assembly 20. Its main framework is that a pair of pillar members 22 corresponding to the number of rows are fixed to both ends of a bottom plate 21, and a guide rod 23 is fixed to the pillar members 22 by penetrating the pillar members 22 between each row. There is. A pair of cavity halves 24 and 25 forming a mold are attached to the guide rod 23 so as to be movable in the horizontal direction so as to sandwich the column member 22 therebetween. Each guide rod 23 is a support member for supporting the mold so that it can be opened and closed. Upper plates 26 and 27 are respectively fixed to the upper part of each pair of pillar members 22 and 22, and one of the upper plates 27 is connected to the bottom plate 21 by a mounting plate 28 of a hydraulic cylinder 36 as a second driving means. This further strengthens the framework of the blow mold assembly. Each upper fixing plate 30 has guide pins 29, 29 protruding upward, and the lower fixing plate 31 has guide pins 29, 29 protruding downward, respectively. The guide pins 29 protruding from the upper and lower fixing plates 30 and 31 respectively are connected to the upper plates 26 and 2.
7 and the bottom plate 21 in the vertical direction. With these configurations, the two upper fixing plates 30, 30 are arranged between the mold and the upper plates 26, 27, each consisting of a pair of cavity halves 24, 25, and between the mold and the bottom plate 21, respectively.
And the two lower fixing plates 31, 31 are the guide pins 29, 2 of the two upper plates 26, 27, respectively.
9 and the guide pins 29 of the bottom plate 21, it is movable in the vertical direction. Each guide pin 2
Reference numeral 9 denotes guide means for guiding each lower fixing plate 31 and upper fixing plate 30 to the bottom plate 21 and upper plates 26, 27, respectively, so as to be movable in the vertical direction. The lower surface of each upper fixing plate 30, 30 facing the upper end of each mold consisting of a pair of cavity halves 24, 25 in the illustrated mold closed state, and the cavity half 2
10a and 10b, a groove 32 and a groove 33 are formed on the upper surface of each lower fixing plate 31 facing the lower end surface of each cavity half portion 24, 25, respectively. Both side surfaces of the grooves 32 and 33 are inclined at an inclination angle θ so as to be able to fit with the upper and lower outer circumferential surfaces of the cavity halves 24 and 25, respectively.

As shown in FIG. 9, hydraulic cylinders 34, which are first driving means, are attached to both ends of each lower fixing plate 31, and a connecting rod 35 is fixed to the operating rod, and a bolt or the like is attached to the upper end of the connecting rod 35. It is fixed to the upper fixing plate 30 by using the upper fixing plate 30. Furthermore, the hydraulic cylinder 34 is movable in the vertical direction with respect to the bottom plate 21. Each upper fixed plate 30 and its groove 32, the upper and lower outer peripheral surfaces of the cavity halves 24 and 25, each lower fixed plate 31 and its groove 33, the hydraulic cylinder 34 as the first driving means, the connecting rod 35, and the guide pin 29 The mold fixing/releasing device which is one of the features of the present invention is constituted by the above.

Next, the mold opening/closing device, which is another feature of the present invention, has two mounting plates 28, which are connecting members, with one end fixed to each of the upper plates 26 and 27 and the other end fixed to the bottom plate 21. Two hydraulic cylinders 36, which are second driving means, are respectively attached. This hydraulic cylinder 36 is constructed by integrating two hydraulic cylinders, and the two rods of each cylinder are configured to operate in opposite directions. Connecting members 37, 38 are connected to these rods, respectively, connecting member 37 is connected to one cavity half 24, 24 of each mold, and connecting member 38 is connected to the other cavity half 25, 24 of each mold. 25. Therefore, when the two hydraulic cylinders 36 are actuated, one cavity half 24, 24 group connected to the connecting member 37 is moved in one direction and the connecting member 3
The other cavity half 25, 25 connected to 8
The group is moved in the opposite direction to the one direction, and the pair of cavity halves 24 and 25 of each mold, which are disposed facing each other, are moved toward and away from each other, thereby performing an opening/closing operation of the mold. is configured to carry out.

Note that the bottom plate 21 has a bottom cavity 39, as shown in FIG. 9, depending on the number of rows and cavities of the mold.
is fixed.

The operation of the blow molding die assembly having the above configuration will be described.

As shown in Figures 7, 8 and 9,
When pressure oil is supplied to one oil chamber of each hydraulic cylinder 34 and the rod is made to protrude, the upper fixing plate 30
does not move due to its own weight, but each lower fixed plate 31 moves downward together with the hydraulic cylinder 34 until its bottom surface contacts the bottom plate 21. At this time, each groove 33 and the pair of cavity halves of each mold are formed on the upper surface of each lower fixing plate 31, facing the pair of cavity halves 24 and 25 of each mold, and corresponding to each mold row. The portions 24 and 25 are separated from each other as shown in FIG. 10b. Hydraulic cylinder 34
As the operation continues and the protruding length of the rod becomes longer, each upper fixing plate 30 is moved upward until it contacts the upper plates 26 and 27, and a pair of molds is attached to the lower surface of each upper fixing plate 30. The grooves 32 formed in correspondence with the respective mold rows facing the cavity halves 24 and 25 of the molds and the pair of cavity halves 24 and 25 of each mold are separated from each other as shown in FIG. 10a. , that is, each upper fixing plate 30 and lower fixing plate 3
1, the mechanical fixation of the pair of cavity halves 24, 25, that is, the mold, is released.

Next, with particular reference to FIG. 7, when pressure oil is supplied to one oil chamber of the hydraulic cylinder 36, which is the second driving means, the connecting member 37 moves forward, that is, moves to the left in the figure, At the same time, the connecting member 38 is retracted, ie, moved to the right in the figure. By this operation, the pair of cavity halves 24 and 25 of each mold, which are connected to the respective connecting members 37 and 38, move away from each other and open the molds. The opening operation of the mold ends when the mold is opened by a distance that allows the hollow molded product to be taken out from above.

The mold closing operation is performed in the reverse order of the mold opening operation described above. That is, when pressure oil is supplied to the oil chamber on the opposite side of the hydraulic cylinder 36 from when the mold is opened,
The connecting member 37 is retracted and the connecting member 38 is advanced. This operation causes the pair of cavity halves 24 and 25 of each mold to move toward each other until they come into contact with the bottom cavity 39, and then stop. In this state, the mold closing operation ends. At the same time as the mold closing operation starts, each upper fixing plate 3
Needless to say, parisons (not shown) are supplied between the molds through the openings 30a formed at 0.0.

Next, when pressure oil is supplied to the oil chamber on the opposite side of the hydraulic cylinder 34 shown in FIG. Move in the direction that approaches you. That is, first, each upper fixing plate 30 moves downward, and the groove 32 is connected to the upper end of the pair of cavity halves 24, 25 of each mold in the mold closed state, as shown by imaginary lines in FIG. 10a. Fits into the outer peripheral surface. Then, as shown by the phantom line in FIG. 10b,
Each lower fixing plate 31 moves upward, and the groove 33 formed on the upper surface of each lower fixing plate 31 fits into the outer peripheral surface of the lower end of the pair of cavity halves 24, 25 of each mold in the mold-closed state. . At this point, the movement of the hydraulic cylinder 34 stops. If pressure is continued to be applied to the hydraulic cylinder 34 in this state, the pair of cavity halves 24 and 25 of each mold will be mechanically fixed, and preparations for the subsequent blow molding operation will be completed.

Grooves 32 in each upper and lower fixing plate 30, 31,
By forming the inclination angle θ of both side surfaces of each upper fixing plate 30, each cavity half 24,
25 and each lower fixing plate 31 can be prevented from coming off from each other due to the reaction force of the molding pressure. That is,
By forming the contact slopes of the above-mentioned fitting parts within the friction angle, the upper and lower fixing plates 3
0, 31 and the cavity halves 24, 25 can be prevented from separating from each other due to the reaction force of the molding pressure. Can provide sufficient holding force for the mold. Furthermore, the sixth
As shown in the figure, the distance A' between the mold rows can be minimized.

According to an experiment conducted on an injection stretch blow blow molding apparatus equipped with the blow mold assembly of this embodiment, the size of the four hydraulic cylinders 34 was 20φ and the output was 1760 kg (hydraulic pressure 14 kg/cm ^{2 )} . 140
Kg/cm ² ), satisfactory molding results were obtained. On the other hand, in the case of the conventional method, at a blowing pressure of 14 kg/cm ² , the size of the four hydraulic cylinders is 55φ,
An output of 13,300 kg (hydraulic pressure of 140 kg/cm ² ) was required for the molding operation. Therefore, in this example, an output ratio of 13300/1760≈7.5 times as compared to the conventional example was obtained.

〔Effect of the invention〕

As described above, the blow molding mold assembly according to the present invention reduces the molding pressure that acts on the mold during the molding process over the entire length of the mold between the upper fixing plate and the mold, and between the mold and the lower fixing plate. Due to the interlocking movement,
Strong support reduces deflection that occurs in the center of the mold due to the reaction force of molding pressure, improving product quality.

Furthermore, in the case of a plurality of rows of molds, the distance between the rows of molds can be shortened, the entire assembly can be made compact and well-organized, and the efficiency of molding work can be significantly improved.

[Brief explanation of the drawing]

FIG. 1 and FIG. 2 are a schematic partially cutaway front view and a plan view, respectively, of a conventional blow molding die assembly;
Figures 3 and 5 are schematic diagrams of conventional single-row and multiple-row mold arrangement rows, respectively, and Figure 4 shows the state of deflection in the center of the cavity half due to the reaction force of molding pressure in the conventional technology. 6 is a schematic diagram of a plurality of rows and a plurality of molds arranged according to the present invention, FIG. 7 is a partially cutaway side view of an embodiment of a blow molding die assembly according to the present invention, and FIG. 8 is a diagram for explaining the present invention. 7 is a cross-sectional view taken along the line A-A, FIG. 9 is a partially cutaway front view of the hollow mold assembly shown in FIG. 7, and FIG. b is a cross-sectional view for explaining the respective fitted and released states between the pair of cavity halves and the lower fixing plate; 20...Blow molding mold assembly, 21...Bottom plate, 22
...Column member, 23...Guide rod, 24, 25...Cavity half, 26, 27...Top plate, 28...Mounting plate, 29
...Guide pin, 30...Upper fixing plate, 30a...Opening, 31...Lower fixing plate, 32...Groove, 33...Groove, 3
4...Hydraulic cylinder, 35...Connection rod, 36...Hydraulic cylinder, 37, 38...Connection member, 39...Bottom cavity, θ...Inclination angle.

Claims (1)

[Claims] 1. A pair of cavity halves in at least one row 2
A mold consisting of 4 and 25, and a bottom plate 21 and a top plate 2 arranged below and above the mold, respectively.
6, 27, the bottom plate 21 and the top plate 26, 27
A hollow mold assembly including connecting members 22 and 28 that integrally connect the bottom plate 21 and the mold, and the top plate 2.
6, 27 and the lower fixing plate 31 and parison supply opening 30a arranged between the molds, respectively.
an upper fixing plate 30 formed with a guide means 29 for guiding the lower fixing plate 31 and the upper fixing plate 30 movably in the vertical direction with respect to the bottom plate 21 and the upper plates 26 and 27, respectively; These are formed along the length direction of the mold on the lower surface of the fixing plate 30 and the upper surface of the lower fixing plate 31, respectively, and can be fitted to the upper and lower outer circumferential surfaces of the mold when the mold is in the closed state. grooves 32 and 33, and grooves formed in the upper fixing plate 30 and the lower fixing plate 31, respectively, by moving the lower fixing plate 31 and the upper fixing plate 30 in opposite directions with respect to the mold in the closed state. a mold fixing/releasing device having a first driving means 34 for respectively fitting the upper end outer circumferential surface and the lower end outer circumferential surface of the mold in the mold closed state to 32 and 33; and a mold fixing/releasing device capable of opening and closing the mold. Following the unfitting operation by the supporting member 23 for supporting and the mold fixing/releasing device, the pair of cavity halves 24 and 25 are moved in mutually opposite directions;
A blow molding mold assembly characterized by comprising a mold opening/closing device having a second driving means 36 for opening the mold. 2 Both sides of the grooves 32 and 33 formed in the upper fixing plate 30 and the lower fixing plate 31, respectively, extending in the length direction of the mold are inclined, and correspondingly, the outer circumferential surface of the upper end and the lower end of the mold are inclined. Claim 1, characterized in that the outer circumferential surfaces of the grooves 32 and 33 are each formed into a slope shape so as to be able to fit into both side surfaces, and the inclination angle θ of the both side surfaces is set to 45 degrees or less. Hollow mold assembly.