JPH054894B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a blow molding mold device for blow molding a hollow body having a rectangular parallelepiped shape, such as a battery case.

[Conventional technology]

The conventional blow molding mold device described above requires a mold device having a cavity of each size for each different size of the hollow body, and multiple sets of molds are required depending on the size of the hollow body. Equipment was available.

[Problem that the invention seeks to solve]

Since it is necessary to prepare a different mold device for each different size of the hollow body to be blow molded, the cost of the mold device is high, and
Since the entire mold apparatus must be replaced every time the size of the hollow body changes, a lot of setup time is required, resulting in poor productivity.

[Means and actions for solving problems]

The present invention has been made in consideration of the above-mentioned problems, and it is possible to improve the versatility of a mold device for molding a hollow body having a rectangular parallelepiped shape with different sizes in the mold clamping direction, and to reduce the cost thereof. In addition, the present invention aims to provide a blow molding mold device that can shorten the setup time when molding different products and improve productivity. In a blow molding mold device in which left and right molds each having a cavity formed by a member having a U-shaped cross section are opposed in the mold clamping direction, the above-mentioned member is connected to the cavity member on the mating surface side of the mold device and the intermediate cavity. The intermediate cavity member is removable and replaceable with one having a different width in the depth direction, and each cavity member is compressed in the mold clamping direction to close the cavity. By removing and replacing the intermediate cavity member, the depth of the cavity in the mold clamping direction can be changed.

〔Example〕

Embodiments of the present invention will be described based on the drawings.

In the figure, 1 and 2 are the left and right mold devices, and 3 and 4 are the respective cavities.
The shape is such that a hollow body 5 having a rectangular parallelepiped shape as shown in FIG. 6 is blow molded. Since the left and right mold devices 1 and 2 are symmetrical and have the same configuration, the right mold device 2 will be described below.

The cavity 4 of the mold device 2 has a front wall surface 4a, a rear wall surface 4b, a back wall surface 4c, and a lower wall surface 4, which are spaced apart from each other in the front-rear direction (perpendicular to the mold clamping direction).
d and the ceiling wall surface 4e have a U-shaped cross section, and the ends of the front and rear side wall surfaces 4a, 4b, the lower wall surface 4d, and the ceiling wall surface 4e form a mating surface 6 that is flush with each other. The depth D from the mating surface 6 of this cavity 4 to the back wall surface 4c is variable.

That is, the back wall member 7 forming the back wall surface 4c is movable in the mold clamping direction. Further, the front and rear side wall surfaces 4a, 4b are the front and rear side wall members 8, 9.
The main wall surface 10 provided on the mating surface side, the back wall surface 11 provided on the back wall member 7, and both wall surfaces 10, 1
1, and the width d of this auxiliary wall surface 13 is
By changing , the depth D in the mold clamping direction to the back wall surface 4c can be changed. The front and rear side wall members 8 and 9 are stepped from the main wall surface 10 thereof, and in this stepped portion, both ends of the back side wall member 7 and an auxiliary wall surface 13 are provided as an auxiliary member 12.
and are slidably abutted.

The auxiliary member 12 has a width d of its auxiliary wall surface 13.
A plurality of auxiliary members 12 having different depths are prepared, and a cavity with a predetermined depth D can be obtained by changing or removing the auxiliary member 12. The front and rear side wall members 8 and 9 and the ceiling wall member 14 are fixed to a back plate 15.

Reference numeral 16 denotes a pushing member that presses the back surface of the back side wall member 7, and both ends of this pushing member 16 are slidable into elongated holes 17 provided in the front and rear side wall members 8 and 9 to extend in the mold clamping direction. Jack bolts 1 are fitted and supported, and the ends thereof are in contact with the back plate 15.
8 are screwed together, and by rotating this jack bolt 18, the pushing member 16 aligns the inner side wall member 7 and presses it on both sides. This pushing member 16 is provided at two locations in the vertical direction.

The lower wall surface 4d has a shape that closes a space surrounded by the front and rear side wall surfaces 4a, 4b and the inner wall surface 4c, and its width can be changed in the mold clamping direction.

That is, the lower wall surface 19 on the mating surface side having the same width as the main wall surface 10 provided on the front and rear side wall members 8 and 9 of both side wall surfaces 4a and 4b, and the inner wall surface 19 on the mating surface side having the same width as the back side wall surface 11 provided on the back side wall member 7. It consists of a lower side wall surface 20 and an auxiliary lower wall surface 21 located between the lower wall surfaces 19 and 20, and the lower wall surface 19 on the mating surface side is formed on a fixed frame 23 fixed to a base 22. ing. Further, the back lower wall surface 20 is formed with a back lower frame 24 that is slidable in the mold clamping direction on the base 22, and the auxiliary lower wall surface 21 is formed with an auxiliary frame that is inserted between the frames 23 and 24. 25. A plurality of auxiliary frames 25 having the same width as the auxiliary member 12 are prepared.

The base 22 is fixed on a lifting table 26, and when the lifting table 26 is raised by a lifting cylinder device 27 or the like, it comes into contact with the lower ends of the front and rear side walls 8 and 9 in the mold clamping state, and the mold is clamped. It is becoming more and more common.

In this state, the back surface of the rear lower frame 24 is engaged with a stepped portion 7a provided at the lower end of the rear wall member 7.

Left and right mold devices 1 and 2 configured as above
The respective back plates 15, 15 are fixed to a mold clamping device (not shown).

Next, the operation for molding the hollow body 5 by blow molding using the left and right mold devices 1 and 2 will be described.

A parison 28 with a closed tip is suspended between the left and right mold devices 1 and 2 in an open state. At this time, the left and right lower bases 22, 22 are moved down.

The tips of the parison 28 are located on the front and rear side wall surfaces 4a and 4b.
The left and right mold devices 1 and 2 are suspended further downward.
Close. In this state, the left and right lower wall surfaces 4d, 4d
The stepped portion 27 of the back side wall member 7 is engaged with the end surfaces of the back side lower frames 24, 24.

Next, raise the left and right bases 22 and push up the tip of the parison 28 with the left and right lower wall surfaces 4d, 4d.
These left and right lower wall surfaces 4d and 4d are connected to mold devices 1 and 2.
secure it in place on the underside of the

Parison 2 is formed by clamping the mold devices 1 and 2 above.
8 is trapped in the mold, then the parison 28
Blow molding is performed by blowing pressure fluid into the inside.

At this time, the tip of the parison 28 before blow molding is pushed up by the raised lower wall surfaces 4d, 4d, so that it is widely spread over the lower wall surfaces 4d, 4d. Therefore, during blow molding, the tip of the parison 28 is blow molded onto the lower side of the cavities 3, 4 without becoming thin.

During the above-mentioned blow molding, the size of the molded product in the mold clamping direction can be changed by replacing or removing the auxiliary member 12 and the auxiliary frame 25 and changing the width of the front and rear side wall surfaces 4a, 4b and lower side surface 4d in the mold clamping direction. be changed. To replace the auxiliary member 12, loosen the jack bolt 18 and push the push member 16 onto the back plate 1.
Move to the 5th side. After replacement, the jack bolt 18 is tightened and the push member 16 is pressed against the back surface of the inner side wall member 7 to be fixed. The auxiliary member 12 is replaced from below when the mold is opened.

In the above embodiment, the lower wall surfaces 4d, 4d are divided into left and right parts corresponding to the left and right mold devices 1, 2, but the lower wall surfaces 4d, 4d may be integrated into the left and right parts. good.

Further, in addition to the embodiments described above, the lower wall surfaces 4d, 4d may be simply flat like the ceiling wall 4c, and the lower side of the cavity may be simply closed by the upward movement of the base 22.

Furthermore, in the above action, the tip of the parison 28 is closed and hangs down on the lower wall surfaces 4d, 4d, but the left and right lower wall surfaces 4d, 4d are made movable in the mold clamping direction as well, so that the tip of the parison 28 is closed. The tips of the parisons 28 that are left hanging in an open state are attached to the left and right lower walls 4.
d and 4d to close this and then move it upward.

4 and 5 show other embodiments of the present invention, in which front and rear side walls 4a', 4b', a back wall surface 4c', and a lower wall surface 4d' in a direction perpendicular to the mold clamping direction are shown. ,
The cavity members constituting the cavity 4' having the ceiling wall surface 4e' are the cavity member 28 on the mating surface side of the mold device and the intermediate cavity member 29.
and a cavity member 30 for the back wall surface, and these are stacked on top of each other to attach the bolt 3.
1, it is assembled under pressure. Note that the cavity member 30 for the back wall surface is fixed to the back plate 15.

In addition, since a rib 32 is provided on the back wall surface 4c', in order to facilitate the machining of the cavity on this back wall surface 4c', the upper and lower corners 33 and 34 are made into separate members and connected with bolts. It's okay.

〔Effect of the invention〕

According to the present invention, a hollow body 5 such as a battery tank having a rectangular parallelepiped shape with different sizes in the mold clamping direction is removed by removing an intermediate cavity member constituting a part of the cavity in the depth direction. By replacing the mold with one with a different width, the same mold device can be used to form the mold, greatly improving the versatility of the mold device. The mold cost for forming the body 5 can be significantly reduced. Moreover, the setup time for changing the size of the molded body is significantly shortened compared to the case where the entire mold device is replaced, and productivity can be improved. Further, the cavity is constituted by a plurality of cavity members, and the space between the cavity members facilitates air release during blow molding.

[Brief explanation of the drawing]

1 to 3 show a first embodiment of the present invention, in which FIG. 1 is a partially cutaway perspective view showing the mold device on the right side, FIG. 2 is a partially cutaway front view, and FIG. The figure is a cross-sectional plan view, FIG. 4 is a perspective view showing the right mold device of the second embodiment, FIG. 5 is an exploded perspective view thereof, and FIG. 6 is a molding device according to the present invention. It is a perspective view showing a hollow body. 1 and 2 are left and right mold devices, and 3, 4, and 4' are cavities.

Claims (1)

[Claims] 1. In a blow molding mold device in which left and right mold devices each having a cavity formed by a member having a U-shaped cross section and facing each other in the mold clamping direction are used to mold a hollow body having a rectangular parallelepiped shape, the above-mentioned members are connected to the mold devices. It is composed of a cavity member on the surface side, an intermediate cavity member, and a cavity member for the back wall surface, and the intermediate cavity member is removable and replaceable with one having a different width in the depth direction. A blow molding mold device characterized in that a cavity is formed by compressing a member in a mold clamping direction.