JPS60129222A - Mold opening device in molding machine - Google Patents

Abstract

PURPOSE:To obtain a mold opening device that separates from the injection pot of the top force retaining plate without using a special hydraulic cylinder by providing a special engaging means to force the top force retaining plate to fall along with the fall of a movable die plate and a stopper to restrain the fall limit of the retaining plate. CONSTITUTION:When molds are opened, the top force retaining plate 10 is at the lowermost position regulated by the stopper and the engagement sections 9, 8 of the connecting rods 7 laid vertically on the movable die plate 4 are connected with the upper side of the connecting plate 15 and the upper side of the top force retaining plate 10. When the molds are closed, the connecting rods 7 rise through the perforations 11 of the top force retaining plate 10 and the perforations of the connecting plate 15. When the molds are opened after the completion of molding, if the movable die plate 4 falls the top force retaining plate 10 is dropped by energizing of the springs 29.

Description

DETAILED DESCRIPTION OF THE INVENTION TECHNICAL FIELD The present invention relates to a mold listener that can open a mold using only a mold clamping cylinder, for example, in a predetermined rubber compression injection molding process.

BACKGROUND ART Conventionally, as a molding machine of this type, there is one shown in FIGS. 1 and 2. This molding machine consists of a fixed die plate 1.1 and a movable die plate 4 to which a lower mold 5 is attached via a hot plate 6.
, a mold clamping cylinder 3 that operates the movable die plate 4; It is equipped with an injection pot 28 that is movable between the plate 10 and a plunger 24 that is attached to the fixed die plates 1 to 1 via a hot plate 25. When the mold is closed as shown in FIG. The rubber material on the upper mold holding plate 1O or the injection pot 28 is heated and simultaneously compressed, flows and flows into the cavity in the mold. After molding is completed, when the piston rod 3a of the mold clamping cylinder 3 descends, the mold is opened as shown in FIG. In order to release the mold, the -L-shaped retaining root 10 is forcibly lowered onto the fixed die plates 1 to 1 by a piston rod 30a of a hydraulic cylinder 30 dedicated to the die plate. However, if there is a hydraulic cylinder 30 exclusively used for molding, a hydraulic valve and an electric control circuit are required to operate this hydraulic cylinder 30.
This not only complicates the structure of the machine and the maintenance and inspection of the machine, but also increases the manufacturing cost.

Purpose The purpose of the present invention is to eliminate the use of the hydraulic cylinder dedicated to opening the mold, and instead utilize only a mold clamping cylinder for operating the movable die and Eve Sea 1 to separate the upper mold holding plate from the injection pot. It is an object of the present invention to provide a type listening device that can eliminate the above-mentioned drawbacks by performing the following steps.

Structure of the Invention The first invention has been made to achieve this object in a molding machine in which the mold is composed of both upper and lower molds. In addition to providing an engaging means for engaging the upper die holding plate so as to move the upper die holding plate, an upper die positioning stopper means for regulating the lowering limit of the upper die holding plate is also provided.

The second invention has been made to achieve this object in a molding machine in which the mold is composed of an upper mold, a middle mold, and a lower mold, and in addition to the configuration of the first invention, the lowering limit of the middle mold holding plate is regulated. A means for a medium-sized positioning stopper is provided.

Embodiment Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 3 to 12. Tie bars 18 are erected and fixed on the four corners of the lower fixed frame 2, and fixed to the upper ends of these tie bars 18. A die plate 1 is fixed, and a mold clamping cylinder 3 is installed on the lower surface of the frame 2. A movable die plate 4 is mounted on the piston rod 3a of the mold clamping cylinder 3, and a lower mold 5 is mounted on the movable die plate 4 via a hot plate 6. Connecting rods 7 are erected and fixed on the four corners of this movable die plate 4,
A pipe 7a is inserted into the upper half of the connecting rod 7, and retaining portions 8.9 are formed at both upper and lower ends of the pipe 7a. The connecting rod 7 is movably inserted into insertion holes 11 formed at the four corners of the upper mold holding plate 10.

The lowering limit of the upper die holding plate 10 is regulated by two upper die positioning stoppers 12 which are erected and fixed on the frame 2 through the insertion holes 4a of the movable die plate 1-4. An upper mold 13 is attached to this upper mold holding plate 10, and a rubber material 14 is attached to the center of the upper surface of this upper mold 13.
is placed.

The pipe 7a of the connecting rod 7 is movably inserted into insertion holes 16 formed at the four corners of the connecting plate 15 above the fixed die plate 1. The lower limit of the connecting plate 15 is regulated by a medium-sized positioning stopper 17 that projects from the center of the upper surface of the fixed die plate 1. A connecting rod 18 is suspended and fixed on one side of the connecting plate 15 through the insertion holes 19 and 20 of the fixed die plates 1 and 1 and the upper die holding plate 10, and a medium holding plate 21 is attached to the lower end of the connecting rod 18. Fixed. 11 of this medium-sized holding plate 21
An insertion hole 22 is formed on the side, into which the collar 12 is movably inserted into the upper die positioning station 1. A middle die 23 is mounted on this middle die holding plate 21 so as to be positioned between the lower die 5 on the movable die plate 4 and the upper die 13 on the upper die holding plate 10.

A plunge p is provided at the center of the lower surface of the fixed die plates 1 to 1.
-24 is attached via the hot plate 25 (+').
A pair of guide bars 27 are movably inserted into the insertion holes 26 formed in the fixed die plate 1-1, and the lower end of the guide bars 27 is connected to the engaging portion 27a at the upper end of the guide bar 27 and the fixed die plate 1. It is regulated by engagement with the upper surface of. An injection bottle 28 is attached to the lower end of the guide bar 27 below the fixed die plate 1, and a spring 29 is interposed between the injection bottle 1 and the lower surface of the fixed die plate 1. The plunge V-24 and the injection pot 28 constitute a material supply device.

Next, the molding configured as follows (J5C)
Explain the forming action.

In the mold opening state shown in FIG. 3, the upper mold holding plate 10 is regulated by the upper mold positioning stopper 12 and is at the lowest position, and the connecting plate 15 connected to the middle mold holding plate 21 is at the middle mold positioning stopper 17. When the medium-sized holding plate 21 is at its lowest position, both upper and lower engaging portions 9 and 8 of the connecting rod 7 erected and fixed on the movable die plate 1 are connected to the upper surface of the connecting plate 15 and the upper die holding plate. The movable die plates 1 to 4 are respectively engaged with the upper surface of the die plate 10 and are in the lowest position.

Further, the injection bottles 1 to 28 are urged downward by the spring 9 and are at the lowest position.

From this mold listening state, the piston rod 3 of the mold clamping cylinder 3
When a rises, the movable die plates 1 to 4 rise and the lower mold 5 overlaps the middle mold 23, as shown in FIG.

At this time, the connecting rod 7 erected and fixed on the movable die plate 4 rises through the insertion hole 11 of the upper die holding plate 10 and the insertion hole 16 of the connecting plate 15.

When the piston rod 3a of the mold clamping cylinder 3 rises from the state shown in FIG. The middle mold 23 overlaps the upper mold 13. Is the medium-sized holding plate 21 up? In other words, the connecting plate 15 is connected to the connecting rod 18.
The upper Fi! with the connecting rod 7 on the movable tie plates 1 to 4 through the! -Jru.

From the state shown in Figure 5 to the roughly movable die play 1, is 4 up? Then, as shown in FIG. 6, the upper mold holding plate 1O is lifted up by the lower mold 5 via the middle mold holding plate 2'1, and the upper mold holding plate 10 simply fits into the injection pot 28, and
The rubber material 14 on the upper mold 13 is inserted into the injection pot 28. When the medium-sized die holding plate 21 is also moved up, the connecting plate 15 moves upward along with the connecting rod 7 on the movable die plate 4 via the connecting rod 18. In addition, as shown by the imaginary line in FIG. 3, the rubber material 14 may be placed in the injection bottles 1 to 28.

Roughly speaking, there are 14 movable die plays 1 to 4 from the state shown in FIG. Then, as shown in FIG. It overlaps with the jar 24. At this time, the medium-sized holding plate 21
As the movable die plate 4 rises, the connecting plate 15 rises together with the connecting rod 7 on the movable die plate 4 via the connecting rod 18. In this mold-closed state, the plunge V-24 enters the injection bottle 1-28, and the rubber material 14 is heated by the hot plates 6 and 25 and simultaneously compressed by the plunger 17-24, flowing and flowing into the chevlet. Inflow covers.

After the molding is completed, as the piston rod 3a of the mold clamping cylinder 3 descends, as shown in FIG. 21, the upper mold holding plate 10, and the injection bottle 1-28 descend following the lowering of the lower mold 5 due to the force of the spring 29 (q).At this time, as the middle mold holding plate 21 descends, the connecting plate 15 moves to the connecting rod. It descends together with the connecting rods 7 on the movable die plates 1 to 4 via 18.

When the piston rod 3a of the mold clamping cylinder 3 gradually descends from the state shown in FIG. 8, the lower mold 5 descends as the movable die plate 4 descends, as shown in FIG.
The middle mold holding plate 21 attaches to the lower mold 5 and descends.At this time, since the upper mold 13 usually does not have a cavity and only has sprues and runners, the middle mold 23 is attached to the upper mold 1.
However, the upper mold 13 remains attached to the injection pot 28 without separating from it. Therefore, the upper mold holding plate 10 is lowered together with the injection pot 28 by the urging force of the spring 29 until the engaging portion 27a of the guide bar 27 and the upper surface of the fixed die plates 1-1 are engaged. When the medium holding plate 21 is lowered, the connecting plate 15 is lowered together with the connecting rods 7 on the movable die plates 1 to 4 via the connecting rod 18.

When the movable die plate 4 further descends from the state shown in FIG. 9, as shown in FIG. 10, the lower mold 5 and the middle mold holding plate 21 descend J while remaining attached to each other.

At the same time, the connecting plate 15 descends together with the connecting rod 7 on the movable die plate 4 via the connecting rod 18, and the engaging portion 8 of the connecting rod 7 comes into contact with the upper surface of the upper die holding plate 10. after that,
As the movable die plate 4 descends, the upper mold holding plate 10 is pushed downward by the engaging portion 8, forcibly separated from the injection pot 28, and is lowered by its own vehicle and raised upward as shown in FIG. Lower 1tL until it comes into contact with the mold positioning stopper 12
I will.

When the middle mold holding plate 21 descends together with the lower mold 5, the connecting plate 1
5 is lowered together with the connecting rod 7 on the movable die plate 4 via the connecting rod 18, and the connecting plate 15 comes into contact with the medium positioning stopper 17 on the fixed die plate 1, as shown in FIG. With this contact, the lowering of the medium-sized holding plate 21 is stopped,
With the lowering of the movable die plate 4, the lower mold 5 is separated from the middle mold 23, resulting in the J-shaped state shown in FIG. Na J3
The molded product is held in a medium mold 23 and automatically taken out.

In this way, in this embodiment, when opening the mold, the mold clamping cylinder 3
When the movable die plate 4 descends as the rod 3a of the screw 1 descends, the engaging portion 8 of the connecting rod 7 engages with the upper die holding plate 10. In this case, the upper mold holding plate 1O is forcibly pulled away from the injection pot 28 and lowered, and the lowering limit of the upper mold holding plate 1O is regulated by the upper mold positioning stopper 12. Unlike the above, there is no need for a hydraulic cylinder dedicated to opening the mold, which is used to separate the upper mold holding plate from the injection pot, and the mold opening can be performed using only the mold clamping cylinder 3.

Note that the present invention is not limited to the above-mentioned embodiment, and the following J: uni configuration is also possible.

B) In the above-mentioned embodiment, a molding machine including an upper mold, a middle mold, and a lower mold was exemplified, but the present invention can also be applied to a molding machine having only upper and lower molds. In this case, the intermediate positioning stopper means 15°17.18 is not required.

(B) In the above-described embodiment, the connecting rod 7 erected and fixed on the movable die plate 4 is formed with the engaging portion 8 for forcibly lowering the upper die holding plate 1O.
If the upper mold holding plate 10 can be forcibly lowered in conjunction with the lowering of the upper die holder 4, the position of the engaging portion 8 and the structure 4r4 can be changed as desired.

(c) In the embodiment described above, the upper mold positioning stopper 12 that regulates the lowering limit of the upper mold holding plate 10 is erected and fixed on the frame 2.
2 can be suspended and supported on the fixed die plate 1.1, and its position and structure can be changed arbitrarily.

(d) In the embodiment described above, one means of the medium-sized positioning stopper that regulates and covers the lowering limit of the medium-sized holding plate 21 is composed of the connecting plate 15, the medium-sized positioning stopper 17, and the connecting rod 18. Stopper 1
7 is eliminated and an engaging portion is provided at the upper end of the connecting rod 18.
Moreover, instead of the connecting plate 15, the medium-sized positioning stopper 17, and the connecting rod 18, a medium-sized positioning stopper 17 may be fixed upright on the frame 2 as shown by the imaginary lines in FIGS. 11 and 12.

Effects According to the present invention described in detail above, unlike the conventional example, the upper mold holding plate 1 can be moved without using a hydraulic cylinder exclusively for mold listening.
O can be separated using only the mold clamping device 3 for actuating the movable die plate 4, eliminating the need for hydraulic valves and electric control circuits associated with a hydraulic cylinder exclusively for mold release.
Therefore, the effect of the 4M construction of the machine and the ease of maintenance and inspection of the machine is achieved.

[Brief explanation of drawings]

Fig. 1 and Fig. 2 show a conventional example, Fig. 1 is a front view showing the molding machine in a closed state, Fig. 2 is a front view showing the mold opening state, and Figs. 3 to 12. 3 shows an embodiment of the present invention, FIG. 3 is a front view showing the mold in an open state, FIG. Figure 5 is a front view showing the lower mold, middle mold, and upper mold stacked on top of each other as the movable die plate rises, and Figure 6 shows the lower mold, middle mold, upper mold, and injection pot stacked on top of each other as the movable die plate rises. FIG. 7 is a front view showing the molds in a closed state, and FIG. 8 is a front view showing the molds in a closed state. -1st view, No. 9
The figure is a front view showing the state in which the upper die and the middle die are separated as the movable tie brake i~ is lowered, and Figure 10 shows the engagement part of the connecting rod on the movable die plate engaging with the upper die holding plate. Figure 11 is a front view showing the state in which the upper mold is forcibly separated from the injection bottle 1 and lowered due to this engagement, and then the rain falls on the upper mold positioning stopper. FIG. 12 is a front view showing a state where the lower mold is pulled away from the middle mold, and FIG. Fixed tie plate 1, mold clamping cylinder 3, screw 1, connecting rod 3a, movable die plate 1 to 4, lower mold 5, connecting rod 7, engaging part 8, upper mold holding plate 10, mold positioning stopper 12, upper Mold 13, connecting plate 15, medium size positioning stopper 17, connecting rod 18, medium size II; holding plate 21, medium size 23, plunger 2/11 recess [-28° Fig. 1 Fig. 2 Fig. 3 Fig. 5 ↓ Chest 9 diagram ↓

Claims (1)

[Claims] 1. Fixed die plate (1) and lower mold (5) are attached ()
The movable die plate (4) and the movable die plate
4), an upper mold holding plate (10) movable between the fixed die plate (1) and the movable die plate (4), and both upper and lower molds (j3.5). In a molding machine equipped with a material supply device (24°28) that fills the cavity in the mold with a material such as rubber when the mold is closed, when the movable die plate (4) is lowered, the upper mold is Engagement means (7, 8,) are provided to engage with the upper die holding plate (10) so as to forcibly lower the holding plate (10), and the lowering limit of the upper die holding plate (10) is set to 11. I
J. A mold opening device to be attached to a molding machine, characterized in that an upper mold positioning stopper means (12) is provided. 2. A fixed die plate (1), a movable die plate (4) to which the lower mold (5) is attached, and a movable die plate 1-(
4), an upper die holding plate (10) and a middle die holding plate (21) that are movable between the fixed die plate (1) and the movable die plate (4), and In a molding machine equipped with a material supply device (24, 28) that prevents the cavity, etc. in the mold from being filled with material when the molds (13, 5) are closed, the movable die plate (4) is lowered when the mold is opened. Engagement means (7, 8) that engage with the upper mold holding plate (10) are provided so that the upper mold holding plate (10) is forcibly lowered. ) and the holding plate (21
) is an upper mold positioning stopper means (1
2) and medium-sized positioning stopper means (15, 17, 1
8) A mold listening device installed in a molding machine, characterized in that it is provided with (). .