JPH05154876A - Metal mold for molding case - Google Patents

Abstract

PURPOSE:To improve release properties in the molding of a battery case in which the inside is partitioned into a plurality of cells. CONSTITUTION:The inner surfaces of six cells of a battery case 1 are respectively molded by six cores 46,..., 51. Each of these cores 46,..., 51 is tapered in the reverse direction to an open part 5 of the battery case 1. The second cores 47, 50 from the outermost ones among the six cores 46,..., 51 can be made movable orthogonally to the open part 5. The cores 47, 50 are driven by hydraulic cylinder devices 73. After the molding of the battery case 1, the cores 47, 50 are pulled to be released from the inner surfaces of the cells. In this manner, if a resin pressure causes the cores 46,..., 51 to be inclined, bite of the cores 46,..., 51 into partition walls 9,..., 13 is prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a case molding die device for molding a case such as a battery case.

[0002]

2. Description of the Related Art FIG. 6 shows an example of a battery case 1 for a general automobile battery. The battery case 1 is integrally molded of plastic, but has side walls 3 and 4 rising from four sides of a rectangular bottom wall 2, respectively, and has a substantially rectangular parallelepiped shape with an open top surface. It is part 5. The side walls 3 and 4 have recesses 6 and 7 that are recessed toward the inside of the case 1.
Are formed respectively. Further, a lid receiving flange 8 is formed on the uppermost outer surface of the side walls 3 and 4. further,
The inside of the battery case 1 is divided into six compartments 14, 15, 16, 17, which are arranged along the side wall 4 and the opening 5, by five partition walls 9, 10, 11, 12, 13 which are substantially parallel to the side wall 4. 18, 19
It is divided into Further, the side walls 3 and 4 are inclined toward the opening 5 in the direction of mutually opening. The partition walls 9, ..., 13 are gradually thinned toward the opening 5. Thereby, the partition walls 9, ...,
Both side surfaces of 13 and the inner surfaces of the side walls 3 and 4 have a draft angle that is inclined toward the opening 5. This draft is, for example, about 6/100.

Next, a conventional molding die device for the battery case 1 will be described with reference to FIG. In this mold device, the battery case 1 is molded with the opening 5 facing downward in the drawing. Reference numeral 21 is a fixed side mounting plate that is mounted on the fixed side platen of the injection molding machine, and the fixed side receiving plate is on the lower side of the fixed side mounting plate 21 in the figure.
22 is fixed. Further, the manifold mounting plate 23 fitted in the central portion of the fixed side mounting plate 21 is fixed to the fixed side receiving plate 22. Then, on the manifold mounting plate 23,
The locate ring 24 is fixed to the upper side in the figure, and the manifold 25 located in the fixed side receiving plate 22 is fixed to the lower side in the figure. Between the locate ring 24 and the manifold 25, the manifold mounting is performed. A sprue bush 26 that penetrates the plate 23 is fixed. The nozzle of the injection molding machine is connected to the sprue bush 26. A runner 28 communicating with the sprue 27 in the sprue bush 26 is formed in the manifold 25, and a heater 29 penetrating the fixed side receiving plate 22 is embedded in the manifold 25. Further, the battery case 1 is provided below the manifold 25 and the fixed side receiving plate 22 in the figure.
The cavity member 31 forming the outer surface of the bottom wall 2 is fixed. The cavity member 31 has a gate 32
Six gate bushes 33 respectively forming the above are arranged in a line and fixed by embedding. The gates 32 correspond to the compartments 14, ..., 19 of the battery case 1, respectively. In addition, each of the gate bush 33 and the runner
Each of the heaters 28 covered with the cover 34 is built in the 28. A slide core guide 36 is fixed to the lower four sides of the fixed side receiving plate 22 in the figure.
The inner surface of each slide core guide 36 is an inclined surface 37 that is inclined outward in the downward direction in the drawing. Located on the inner side of these slide core guides 36, below the fixed side receiving plate 22 in the figure, the side wall 3 of the battery case 1 is provided.
A slide core 38 that forms the outer surface of No. 4 is slidably incorporated. An angular pin 39 fixed to the fixed side receiving plate 22 is slidably inserted into the slide core 38. The angular pin 39 is positioned substantially parallel to the inclined surface 37 of the slide core guide 36, but is prevented from coming off from the slide core 38 by a stopper 40 fixed to the lower end of the angular pin 39 in the figure. ing. That is, the slide core 38 is movable with respect to the angular pin 39 only by a predetermined distance. Along with this, the slide core 38 is
The fixed side receiving plate 22 is urged downward in the drawing.

Reference numeral 44 denotes a movable side mounting plate which is mounted on a movable side platen of the injection molding machine, and a movable side receiving plate 45 is fixed to the upper side of the movable side mounting plate 44 in the figure. Further, in the upper central portion of the movable side receiving plate 45 in the figure, six cores 46, 47, 48 forming the inner surfaces of the compartments 9, ..., 13 of the battery case 1 (three of which are shown) No) is arranged in a row and fixed. Each of the cores 46, 47 and 48 has a shape that tapers in a direction opposite to the opening 5 of the battery case 1 (upward direction in the drawing), whereby a draft is provided. Also, cores 46, 47,
The lower portion of 48 is embedded in a recess 52 formed in the movable side receiving plate 45, and is fixed to the movable side receiving plate 45 by a bolt 53. A first wedge 54 and a second wedge 55 that sandwich the six cores 46, 47, 48 from the arrangement direction are also embedded in the recess 52. The second wedge 55 is fixed to the movable side receiving plate 45 with a bolt 56. Then, when the second wedge 55 is driven downward and pushed in, the six cores 46, 47, 48 are clamped to each other by the action of the inclined surface between the wedges 54, 55. This is the core 46,4
This is because the cores 46, 47, 48 are prevented from tilting due to the resin pressure during the injection process by firmly fixing the cores 7, 48. In addition, the cores 46, 47 and 48 are provided with pins 57 for positioning them relative to each other. Further, a pressing member 58 for fixing the second wedge 55 from above in the drawing is fixed to the movable side receiving plate 45 so as to surround the six cores 46, 47 and 48. A die member 59 that forms an end edge portion on the opening 5 side of the outer surface of the side walls 3 and 4 of the battery case 1 is embedded and fixed in the upper inner peripheral portion of the pressing member 58 in the figure.

Next, the operation of the above configuration will be described. When molding the battery case 1,
First, the mold is clamped. In this mold clamping state, between the cavity member 31, the slide core 38, the cores 46, 47, 48 and the mold member 59,
A cavity 61 having the shape of the battery case 1 is formed. The molten plastic injected from the nozzle of the injection molding machine is the sprue 27 and the runner of the manifold 25.
It flows through the gate 28 and the gate bush 33 into the cavity 61 from the gate 32. After the plastic filled in the cavity 61 is solidified, the mold is opened. With this mold opening, the cavity member 31 separates from the outer surface of the bottom wall 2 of the battery case 1 which is a molded product. At the same time, the bias of the spring 41 causes the slide core 38 to move slightly along the angular pin 39 downward in the drawing. As a result, the slide core 38 is separated from the outer surfaces of the side walls 3 and 4 of the battery case 1. Then, after the mold opening is completed, the battery case 1 is pulled out from the cores 46, 47, 48 and the battery case 1 is taken out.

[0006]

However, the conventional battery case molding die apparatus has the following problems. That is, although the six cores 46, 47, 48 are firmly fixed by using the wedges 54, 55, etc., these cores 46, 47, 48, etc., are the cavity 61 part which becomes the partition walls 9 ,. Since it is divided over a wide range, it is easy to tilt due to resin pressure. For example, the original thickness of the side walls 3 and 4 and the partition walls 9 ...
By tilting 46, 47, 48, the side walls 3, 4 and the partition wall 9,
The thickness of 13 may vary up to about 3 mm. When the cores 46, 47, 48 are greatly inclined, the cores 46, 47, 48 bite into the partition walls 9, ..., 13,
The cores 46, 47 and 48 cannot be removed from the molded battery case 1. When the cores 46, 47, 48 cannot be pulled out in this way, it becomes necessary to disassemble the cores 46, 47, 48.

The present invention is intended to solve the above-mentioned problems, and is for molding a case having an opening on one surface and partitioning the inside into a plurality of compartments arranged along the opening. An object of the mold apparatus is to ensure that a plurality of cores that respectively form the inner surfaces of the compartments come out of the case.

[0008]

In order to achieve the above-mentioned object, a case molding die device of the present invention has a plurality of compartments each having an opening on one surface and having a partition wall arranged inside along the opening. In a molding die device for a case divided into, a plurality of cores each having an inner surface of each of the compartments and having a shape that tapers in a direction opposite to the opening is provided. Some of the cores are movable relative to other cores in a direction substantially orthogonal to the opening, and a drive mechanism for driving the movable cores is provided.

[0009]

In the case-molding die device of the present invention, when a case is formed in which one surface is an opening and the inside is partitioned by partition walls into a plurality of compartments lined up along the opening,
When the mold is opened after the case is molded, the drive mechanism relatively moves some of the cores forming the inner surface of each compartment relative to the other cores in a direction substantially orthogonal to the opening. Move to. Along with this, the core has a shape that tapers in the direction opposite to the opening, so that the part of the core or the other core is separated from the inner surface of the compartment. As a result, even if the core is tilted due to the resin pressure applied during the injection process, the core is prevented from biting into the partition wall, and the core falls out of the case when the case is taken out.

[0010]

The first embodiment of the case molding die apparatus of the present invention will be described below.
Examples will be described with reference to FIGS. 1 to 3. Since the molded case is the same as the battery case 1 shown in FIG. 6 described above, the corresponding parts are designated by the same reference numerals and the description thereof will be omitted. Also,
Since the case molding die device also has basically the same structure as that shown in FIG. 7 described above, the corresponding parts are designated by the same reference numerals, and the description thereof will be omitted. The points will be mainly explained. In the first embodiment, of the six cores 46, 47, 48, 49, 50, 51 forming the inner surfaces of the compartments 14, ..., 19 of the battery case 1, the second two cores 47 from the outer side are included. , 50 are movable relative to the other cores 46, 48, 49, 51 and the movable side receiving plate in the vertical direction in the figure, that is, in the direction orthogonal to the opening 5 of the battery case 1. The cores 46, ..., 51 are tightly fastened by the wedges 54, 55, but the two cores 47 ,.
In order to allow the movement of 50, the structure as shown in FIG. 3 is adopted. That is, the lower parts of the other cores 46, 48, 49, 51 are longer than the movable cores 47, 50, and the tightening force transmitting parts are extended from the lower parts of the other cores 46, 48, 49, 51 to both sides. 66 is protruding. Spacers 67 are provided on both sides of the lower part of the cores 46, ..., 51 along the arrangement direction of the cores 46 ,. Each of the spacer members 67 has a space holding portion 68 having a width substantially the same as that of the cores 47 and 50 and fitted between the tightening force transmission portions 66.
With this configuration, the wedges 54 and 55 allow the outermost core
The tightening force applied to the 46, 51 in the direction indicated by the arrow is passed through the tightening force transmitting section 66 of the cores 46, 48, 49, 51 and the spacing holding section 68 of the spacer member 67 to the two cores 4 in the center.
It is transmitted to 8 and 49. On the other hand, the spacing member 68 of the spacer member 67 causes the spacing between the cores 46 and 48 and the core 49,
Since the space between 51 is maintained, the tightening force by the wedges 54 and 55 is not transmitted to the core 47 located between the cores 46 and 48 and the core 50 located between the cores 49 and 51. As a result, the two cores 47, 50 are allowed to move while the cores 46, ..., 51 are firmly tightened by the wedges 54, 55.

As shown in FIG. 1, these two cores 47,
The reference numeral 50 has a collar portion 71 at the lower end portion in the drawing.
Are located in the space 72 formed in the movable side receiving plate 45. The two cores 47 and 50 have a space and a position where the flange portion 71 abuts the lower end surface of the other cores 46, 48, 49 and 51 in the figure.
It is possible to move, for example, about 20 mm between it and the position of the bottom surface of 72. Further, the movable side receiving plate 45 has the above-mentioned 2
A hydraulic cylinder device 73 that constitutes a drive mechanism that drives the two cores 47, 50 in the vertical direction in the drawing is assembled, and a piston rod 74 of the hydraulic cylinder device 73 that moves up and down in the drawing is fixed to the lower ends of the cores 47, 50. Has been done. further,
Within the space 72 of the movable-side receiving plate 45, a pair of stoppers 75 are provided for the cores 47 and 50 so as to be movable in the horizontal direction in the drawing. The stoppers 75 hold the cores 47, 50 in the raised position by contacting the inclined surfaces 76 formed on the upper surfaces thereof with the inclined surfaces 77 formed on both sides of the lower surfaces of the cores 47, 50 in the figure. However, it is movable to a position where it deviates laterally from the cores 47 and 50. And the stopper
To drive 75, the piston rod 79 of the hydraulic cylinder device 78 assembled to the movable support plate 45 is stopped by the stopper 75.
It is fixed to.

Next, the operation of the above configuration will be described. When molding the battery case 1,
First, the mold is clamped. At the same time, as shown by the solid line in FIGS. 1 and 2, the core 4 is driven by the hydraulic cylinder device 73.
The hydraulic cylinder device 7
The stopper 75 is moved forward by the drive of 8 and its inclined surface 7
Press 6 against the inclined surface 77 of the core 47, 50. In this state, the cores 47, 50 are aligned with the other cores 46, 48, 49, 51, and the cavity member 31, the slide core 38, and the cores 46, 47, 48, 4
Battery case 1 between 9, 50, 51 and mold member 59
A cavity 61 having the shape of is formed. Then, the cavity 61 is filled with molten plastic. At this time, the flange portions 71 of the movable cores 47 and 50 are the other fixed cores.
While hitting the lower end surface of 46, 48, 49, 51, the core
Since 47, 50 are supported and fixed from below in the figure by the stopper 75, the cores 47, 50 do not inadvertently move even if they receive resin pressure during the injection process. Further, after the plastic filled in the cavity 61 is solidified, the mold is opened. After this mold opening, the battery case 1 remains on the cores 46, ..., 51 side. After the battery case 1 is molded, when the mold is opened, the stopper 75 is first driven by driving the hydraulic cylinder device 78 as shown by a chain line in FIGS.
Retreat to remove from core 47, 50. Next, by driving the hydraulic cylinder device 73, the cores 47 and 50 are lowered in the drawing. Along with this, the cores 46, ..., 51 have the battery case 1
The two cores have a shape that tapers in the direction opposite to the opening 5 of FIG.
47 and 50 are separated from the inner surfaces of the compartments 15 and 18 of the battery case 1. As a result, even if the cores 46, ..., 51 are inclined from their proper positions due to the resin pressure applied during the injection process, when the battery case 1 is taken out, the partition walls 9 ,. , 13 are released, and the cores 46, ..., 51 are reliably removed from the battery case 1.

Next, a second embodiment of the present invention will be described with reference to FIGS. 4 and 5. In the first embodiment, the driven cores 47 and 50 are pulled from the battery case 1, whereas in the second embodiment, the driven core 47 is pushed out to the battery case 1. As shown in FIG. 4, the driven core 47 has a flange 81 at the lower end in the figure. On the other hand, a stepped portion 82 facing downward is formed at the lower end portion of the fixed cores 46, 48 in the figure.
The driven core 47 has a lower end surface that abuts on the movable side receiving plate 45 from above and the core portion 47 fixed to the collar portion 81.
It is movable between a position where it hits the stepped portion 82 and a position where it hits from below. Further, a hydraulic cylinder device 83 that constitutes a drive mechanism that drives the core 47 in the vertical direction in the drawing is assembled to the movable side receiving plate 45, and a piston rod 84 of the hydraulic cylinder device 83 that moves up and down in the drawing is attached. It is fixed to the lower end of the core 47. Further, notches 85 are formed on both sides of the lower portion of the core 47, and the notches 85
The lower surface in the figure is an inclined surface 86. On the other hand, in the movable side receiving plate 45, a pair of stoppers 87 is provided so as to be movable in the horizontal direction in the drawing with respect to the core 47, and an inclined surface 88 is formed below the stoppers 87. The stopper 87 has its upper surface shown in the figure against the upper surface of the cutout portion 85 of the core 47 and its inclined surface 86 against the inclined surface 88 of the cutout portion 85. The piston rod 90 of the hydraulic cylinder device 89 assembled to the movable side receiving plate 45 is fixed to the stopper 87 for driving the stopper 87.

Next, the operation of the above configuration will be described. When molding the battery case 1,
First, the mold is clamped. At the same time, as shown by the solid line in FIGS. 4 and 5, the core 47 is driven by driving the hydraulic cylinder device 83.
Is lowered in the figure, and the stopper 87 is moved forward by driving the hydraulic cylinder device 89, and the upper surface in the figure is brought into contact with the upper surface of the cutout portion 85 of the core 47. In this state,
The core 47 is aligned with the other cores 46 and 48, and a cavity 61 having the shape of the battery case 1 is formed between the cavity member 31, the slide core 38, the cores 46, 47 and 48, and the mold member 59. .. Then, the cavity 61 is filled with molten plastic. At this time, the lower end surface of the core 47 contacts the movable side receiving plate 45 from above, the upper surface of the stopper 87 contacts the upper surface of the cutout portion 85 of the core 47, and
The slanted surface 88 of 87 hits the slanted surface 86 of the notch 85 from above, so that the core 47 is securely fixed, and even if the core 47 receives the resin pressure during the injection process, the core 47 unintentionally floats. I do not. Further, after the plastic filled in the cavity 61 is solidified, the mold is opened. After opening this mold, the core
Battery case 1 remains on the 46, 47, 48 side. Then, with the mold opening, or after the mold opening, as shown by the chain line in FIGS. 4 and 5, by driving the hydraulic cylinder device 89,
After retracting the stopper 87, the core 47 is raised by driving the hydraulic cylinder device 83. At least finally, the inclined surface 88 of the stopper 87 comes into contact with the inclined surface 86 of the cutout portion 85. As described above, when the core 47 rises in the figure, the other cores 46 and 48 descend relative to the rising core 47. As a result, the cores 46, 47, 48 are tapered in the direction opposite to the opening 5 of the battery case 1, that is, in the upward direction in the drawing,
The other cores 46, 48 are compartments 14, 16 of the battery case 1.
Away from the inside. As a result, even if the cores 46, 47, 48 are tilted from their proper positions due to the resin pressure applied during the injection process, when the battery case 1 is taken out, the partition walls 9, 47 of the cores 46, 47, 48 ,. , 13 bite is released, battery case 1 to core 46, 4
7 and 48 can be removed surely.

The present invention is not limited to the above-described embodiments, but various modifications can be made. For example, in the above embodiment, the number of partition walls 9, ...
The battery case 1 having six, four, ..., 19 has been described as an example, but the numbers of partition walls and compartments are not limited to those in the above-described embodiment. Further, for example, in the first embodiment, 6
Two cores 47, 50 from the outside of the one core 46, ..., 51
However, the position and the number of cores to be driven are not limited thereto. Further, the drive mechanism of the core is not limited to the hydraulic cylinder devices 73 and 83.

[0016]

According to the present invention, in a molding die device for a case, which has one surface as an opening and the inside of which is partitioned by a partition wall into a plurality of compartments arranged along the opening, in the direction opposite to the opening. A part of a plurality of cores each having a tapered shape and forming an inner surface of each compartment is relatively movable with respect to another core in a direction substantially orthogonal to the opening. At the same time, since a drive mechanism for driving the movable core is provided, when taking out the molded case, some of the cores are moved with respect to the other cores to separate these cores or the other cores from each other. By separating from the inner surface of the chamber, even if the core is tilted due to the resin pressure applied during the injection process, when the case is taken out, the bite of the core into the partition wall can be released and the core can be reliably removed from this case. ..

[Brief description of drawings]

FIG. 1 is a partial cross-sectional view showing a first embodiment of a case molding die device of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a plan view of the vicinity of the core.

FIG. 4 is a partial cross-sectional view showing a second embodiment of the case molding die device of the present invention.

5 is a sectional view taken along line BB of FIG. 4 above.

FIG. 6 is a perspective view of a battery case.

FIG. 7 is an overall cross-sectional view showing an example of a conventional case molding die device.

[Explanation of symbols]

 1 Battery case (case) 5 Opening 9, 10, 11, 12, 13 Partition 14, 15, 16, 17, 18, 19 Compartment 46, 47, 48, 49, 50, 51 Core 73 Hydraulic cylinder device (drive) Mechanism) 83 Hydraulic cylinder device (drive mechanism)

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁵ Identification code Office reference number FI technical display area // B29L 31:34 4F

Claims (1)

[Claims] 1. A molding die device for a case, wherein one surface is an opening and the inside is partitioned by a partition into a plurality of compartments arranged along the opening, the taper tapering in a direction opposite to the opening. A plurality of cores each having a shape that forms an inner surface of each of the compartments, and a part of the plurality of cores is relative to another core in a direction substantially orthogonal to the opening. A case molding die apparatus, which is movable and has a drive mechanism for driving a movable core.