CZ306861B6 - A casting mould with a damper device usable for the production of bimaterial plastic parts and with improved mobility - Google Patents

Abstract

The casting mould with the damper device with improved mobility usable for the production of bimaterial plastic parts where all the regulating elements (2) of the casting mould (1) are connected to the same drive mechanism, while the casting mould comprises the transversal holder (8) driven by the single hydraulic cylinder (12). The regulating elements (2) have a significantly small size compared to conventional regulating elements, and the ineffective space of the casting mould (1), which is occupied by the drive mechanism, is reduced. The transversal holder (8) is connected, on one of its sides, at a point of the rotating joint (11), to the casting mould (1) and, on the opposite side, to the hydraulic cylinder (12) which lifts it on this side. The regulating elements (2) with their base (9) are connected to the transversal holder (8), namely with the clamps (10), which are provided for this purpose in the holder (8).

Description

Casting mold with slide device usable for production of bimaterial plastic parts and with improved mobility

Technical field

The present invention relates to a casting mold with a slide device which can be used for the manufacture of bimaterial plastic parts and has improved mobility, as shown.

In particular, the object of the present invention is to provide a device of the type intended to produce bimaterial panels of plastic material, i.e. castings consisting of two parts of different colors and / or different types of material, which are obtained by injection molding, said apparatus it acts as a filter to limit the flow of the first injection material into a certain space of the casting mold and to move the second material into the rest of the space of said casting mold, and has the peculiarity of containing an innovative mechanism and innovation structure that in this way, it improves its ability to move within the casting mold in comparison with prior art slide systems.

The field of application of the present invention can be assigned to the technical sector of the industry which is engaged in the production of plastic bimaterial parts, in particular injection molded bimaterial plastic parts.

BACKGROUND OF THE INVENTION

As is known, multi-component injection technology encompasses a wide variety of fields and can be defined as injecting more than one material or more than one component into the same casting mold and in one process, without further steps outside the machine; currently and generally the most commonly used techniques are multicolored and multimaterial techniques with two or more thermoplastic materials.

Said technique, in particular applicable to obtaining bimaterial plastic parts, i.e. plastic parts composed of two parts of different color and / or different types of material, comprises the use of so-called slide devices which are connected to a casting mold and which comprise at least one hydraulic cylinder movable a member which allows the first plastic part to be injected, and by moving it to increase the dimensions of the casting mold so as to create a location for injection of a second material which forms a plastic part together with the first material.

However, this system has the disadvantage that traditional shutters require a lot of space in the casting mold, which strongly limits other possible slide movements. In addition, the mechanism of said slides is usually very complex and also requires complex and difficult processing.

It was therefore necessary to provide a shutter system which allows to reduce the space occupied in the casting mold and consequently to favor and improve its mobility, which is the main object of the present invention, in addition to knowing that no other applicant has similar technical properties, structure, or similar configuration.

SUMMARY OF THE INVENTION

Accordingly, the present invention provides a casting die with improved mobility that can be used to produce bimaterial plastic parts satisfactorily in advance of these predetermined tasks and represents a novelty in its field,

Wherein the characteristics which make this possible are suitably described in the claims appended to the description.

Specifically, while traditional slider systems involve the use of hydraulic piston driven actuators whose design and mode of operation is complex and requires a lot of space in the casting mold, resulting in too large dead space zones in the mold, the casting mold proposed here removes The disadvantage of connecting all the control members which interfere with the mechanism which moves them together in a manner in which there is only one center of rotation and one cylinder for its movement.

In this way, the control elements can be much smaller and lighter, thereby significantly reducing the dead space in the casting mold and subsequently leaving room for further possible movements of the control elements.

The new damper device with improved mobility, which can be used for the production of bimaterial plastic parts, is subsequently an innovative construction with structural and constitutional features which have not been known to date to achieve this objective, which - coupled with its practical utility - sufficiently justifies the required privilege of exclusivity.

Clarification of drawings

For a better interpretation of the invention, this description will be appended to some figures which, by way of non-limiting example, show preferred embodiments of the invention according to the principles of the claims.

The pictures show:

Figure 1 shows the state of the art in a schematic front view of an exemplary casting mold with a traditional slide device in which the large space occupied by the two control members is visible, as well as the hydraulic actuators of said control members.

Figures 2, 3, 4 and 5 show the same example of a casting mold as in Figure 1 with an improved mobility gate device represented by the subject of the invention in its various phases of operation in which the parts and elements of said gate device are as well as their configurations; the arrangement in the casting mold is clearly visible.

DETAILED DESCRIPTION OF THE INVENTION

With reference to the figures described and in accordance with the numbering chosen, an example of an embodiment of the invention is shown in the figures, which comprises parts and elements which will be shown and described in detail below.

As can be seen from the figures, in the casting mold 1 with the slide device by the regulating members 2, by their movement, the passage to the space 3 in the interior of said casting mold is first restricted for the first material M1 and subsequently opened and then for the second material M2, which together form the bimaterial plastic part to be formed, these materials being injected by respective injection points 4 and 5, respectively, which are located in one part 1a of the casting mold 1 for this purpose.

In traditional systems, as can be seen in the example shown in Figure 1, the regulating members 2 are formed by voluminous elements which, independently of the drive mechanisms 6, such as a hydraulic piston, are mounted on voluminous supports 7 which

In addition to occupying an important space within the casting mold 1, they significantly constrain other possible movements of said control members 2.

It can be seen from Figures 2 to 5 that the slide device proposed according to the invention envisages the use of control elements 2 of significantly smaller size, having the particularity that they are all connected to the base with the same single drive mechanism 6 consisting of a transversal holder 8. the base 9 of which are clamps 10 for this purpose.

Said support 8 is connected on one side to a pivot point 11 and on the opposite side to a hydraulic cylinder 12 which lifts it on said side.

In this way, all the regulating members 2 that form the slider system are moved by means of a single cylinder 12 and therefore a single drive mechanism. Thus, it is achieved that said regulating members may consist of smaller parts which, in a preferred manner, may perform other movements within the casting mold.

According to the method of operation of the proposed slide gate device described above, in the initial phase, as shown in Figure 2, the transversal holder 8 is lifted by the operation of the hydraulic cylinder 12 so that the control members 2 are held up, thereby restricting leakage into space 3 By means of the respective injection point 4, it has achieved that this material only occupies the space to be occupied, as shown in Figure 3.

Subsequently, as shown in Figure 4, the hydraulic cylinder 12 drops, thereby lowering the transverse holder 8, which on its side lowers the control members 2, thus leaving the filter open so that when the second material M2 is introduced through the respective injection point 5 this material enters the remaining space 3. of the casting mold, as shown in Figure 5, thereby forming the bimaterial plastic panel.

In summary, the invention proposes a slide gate device in which all the control members 2 of the casting mold 1 are connected to the same and a single drive mechanism 6 consisting of a transversal holder 8 and driven by a single hydraulic cylinder 12, thereby ensuring that said control members 2 have a reduced size compared to conventional control members and that the inefficient casting mold spaces 1 that are occupied by the drive mechanism 6 are significantly reduced compared to the ineffective casting mold spaces that are used with conventional propulsion mechanisms, thereby giving room for other possible movements Regulators 2.

Once the nature of the present invention, as well as the practice of practicing it, has been sufficiently described, it is not considered necessary to broaden the scope of the disclosure, as one skilled in the art will understand its scope and advantages.

It is also noted that the damper device described herein, which can be used to produce bimaterial plastic parts and exhibits improved mobility, can also be put into practice in other embodiments that differ in detail from the example shown and thus obtain the required protection unless the underlying principle is changed, replaced or modified.

Claims (2)

1. A casting mold with a slide device with improved mobility for use in the manufacture of bimaterial plastic parts and adapted for use in casting molds (1) comprising control members (2) which are driven by hydraulic systems to control the flow into the interior ( 3) casting molds (1) for a casting made of materials which are injected for this purpose by injection points (4, 5) provided with a casting mold, characterized in that each regulating member (2) of the casting mold (1) is coupled to a single drive mechanism (6); wherein the drive mechanism (6) is formed by one transversal holder (8), which in turn is driven by a single hydraulic cylinder (12); wherein the transversal holder (8) controlling each control member (2) is attached to the casting mold (1) on one side at the pivot point (11) and on the opposite side is connected to the hydraulic cylinder (12) to lift the casting mold (1) ). A casting mold with an improved mobility device according to claim 1, for use in the manufacture of bimaterial plastic parts, characterized in that the regulating members (2) are connected to the transversal holder (8) via the base (9) of the regulating members (2) by clamps (10) provided on the holder (8).