LT5316B - Device for a mould body from synthetics made by injection method - Google Patents

Abstract

The invention relates to device for moulding body from synthetics by injection method comprises a device for moulding by injection method (1) and a suitable instrument (2), present instrument (2) comprises at least two cavities (11, 12), which correspond to dimensions of moulding products. An instrument (2) consists of three parts, which can be reversed in respect of each other (4, 5, 6), wherein at least one canal (13) is connected to a feed reservoir of molten plastic material. A locking mechanism is fixed to parts (4, 5, 6) of a instrument (2) and can be regulated between two positions. In a first position only a central part (5) and a front part (4) of a instrument (2) is locked with a inlet part (14) of a canal (13) and in a second position only a central part (3) and an end part (6) of an instrument (2) are locked between themselves. For this purpose at least an one gear (19) with at least one piston (18) is connected a central part (5), a piston (18) is shifted by a gear (19) in two one ano

Description

The invention relates to a device for injection molding of plastics molds, which comprises an injection molding mechanism and an associated device comprising at least two cavities corresponding to the dimensions of the molds to be manufactured, the device comprising at least three relatively movable parts extending in a working position the dividing planes perpendicular to the movement of the cavities perpendicular to each other and fixed parallel to each other while each dividing plane passes through at least one cavity and wherein the device is provided with at least one channel for supplying melted plastic on one side in the cavities and, on the other hand, at the entrance to the surface of the device which, in the working state, is attached to the injection molding mechanism (DE Journal of Synthetic Materials 84 (1994) 10, pages 1375 to 1382).

Injection molding machines are used in the production of almost all models. The proprietary device only needs to have cavities into which molten synthetic material could be injected. The separated parts of the device are hydraulically compressed in the working condition. After injection of the synthetic material into the cavities of the device, it remains closed in the conventional technique until the mold in the cavities has cooled sufficiently and is thus strong enough to be removed from the device. To do this, the device is opened at the dividing planes by pulling its parts apart. Meanwhile, when the synthetic molded material is cooled in the cavities, the injection molding mechanism is not used. This disadvantage is very serious when producing a relatively large form with a long cooling time.

The benefit of the injection molding mechanism increases with the installation of a tandem device according to DE DE Synthetic Materials 84 mentioned above. In an injection molding machine working with such a device, the parts alternate in two separate planes. During the cooling of one of the separable planes, the shapes may be formed from the second separable plane. This working method is useful form in which the cooling time is longer cavities ₂ EN 5316 B with necessary dosing interval. Injection molding mechanisms operating in tandem techniques are expensive. They need an internally mounted, internal movable plate with an injection molding device attached to the side. The dissolved synthetic material is injected through the passages in the inner plate into the corresponding cavities. This known tandem technique is either impossible to incorporate into conventional injection molding machines or requires a major overhaul.

It is an object of the present invention to form the device illustrated above in such a way that, by using a conventional injection molding mechanism, the displacement of the finished molds can be increased in a simple manner by locking the separating planes which open each time.

This object of the injection molding mechanism according to the invention is solved by

- that the device is provided with a channel extending from the entrance to the first separable plane and further to the second separable plane from which the partial passages extend to the cavities, and

- that parts of the appliance are fitted with a lock between two positions which locks only the middle part and the front part of the appliance having a channel inlet, and in the second position only the middle part and the rear part of the device.

This unit can be adapted to conventional, standard injection molding machines without special reconstruction and without additional measures. It is necessary to replace the previously used simple device with two separating planes by a new unit with three divisions with two separating planes. Similar to the tandem technique illustrated, this device increases the displacement of molds while the injection of synthetic material cools the cavities of one separating plane in the area of one separating plane. Of particular importance to this device is the lock used for the device parts during the specific cooling phase. It is easily adjustable between two positions. Whereas, when the lock locks the two parts of the device together during cooling to obtain the residual force holding them together, the separating plane may simultaneously be opened towards the third part for the forming of the finished shapes. After this the next _three LT 5316 B separation plane locking and synthetic materials injection into cavities, the shutter is closed, even the device is moved to the second position. Both parts of the device, with their newly filled cavities, remain close to one another, and the previously locked parting plane can be opened to form a cooled form as soon as the pressure applied to the device during the injection is eliminated.

The given task of performing a lock is solved in addition,

- that at least one motor with at least one damper towards the axis of the device is mounted near the center of the device, which can be moved by the motor to two opposite longitudinal directions between the two end positions,

- that the device is furthermore provided with at least one clamping mechanism in the area of each partitioning plane, with one part of the device respectively mounted to the middle part, while the second part interacting with the respective first part is mounted on the front part of the device at the back of it,

- that at least one bracket extending towards the axis of the device is attached to the front and the rear of the device as a second part of the clamping mechanism, which, when the device is closed, extends at least one clamping body to the respective first part of the clamping mechanism;

- that the latch performs, respectively, one of its end positions, a clamping body locking device with an appropriate clamping mechanism.

This locking is particularly simple to construct. It consists essentially of a latch and two clamping mechanisms which alternately engage the latch. In order to achieve effective locking between the two respective parts of the device, it is necessary to push the latch into its respective locking position into one of the clamping mechanisms so that the clamping body is moved to the locking position. In the corresponding locking position, the latch is pulled out of the clamping mechanism in the area of the other separating plane, respectively, whereby the device can be opened in this separating plane.

The engine can usefully be started automatically. This can be done with a pneumatic or electronic motor. However, the most commonly used is a hydraulic motor.

A lock consisting of a motor with a latch and a clamping mechanism can be usefully placed, saving space inside the device profile. The outside dimensions of the device do not increase due to the locking details. Depending on the size of the device, it is useful to have at least two locks on two opposite sides of the device.

Examples of the construction of the object of the invention are shown in the drawings.

They depict:

Fig. 1 is a schematic representation of a partial cut-away device of the invention at the closure.

Fig. 2 and 3 - device opened in two different positions according to fig. 1.

Fig. 4 - One of the locks built into the unit is shown essentially.

Fig. 5 compared to Fig. 4 Completed form design of the unit.

Fig. 6 and 7 according to Fig. 5. in open fig. 2 and 3 respectively.

Fig. The bracket used in device 8 is enlarged.

Fig. 9 cut through Fig. 8 along the lines ΙΧ-ΙΧ.

The drawings show only the details of an injection molding machine necessary to reveal the essence of the invention. These elements, such as opening and closing mechanisms and refrigeration ducts or heating devices, are generally known. Fig. 4 to 7 for clarity the cuts are dotted.

Injection molding device according to fig. 1 consists of injection molding mechanism 1 and attachment device 2. Injection molding mechanism 1 can be a conventional, standard machine without any special equipment. It is pushed in the direction of the double arrow 3.

The device 2 consists of 3 parts, one front 4, one middle 5 and one rear 6. In the rear area it is closed by a pressure plate 7 which is connected to a pressure generator 8. For example, a pneumatic or hydraulic press can be used as a pressure generator 8. The three parts of the device 2 are separated by two parallel interpreting planes 9 and 10. Each separating plane 9 and 10 may have at least one cavity 11 or 12 of the device 2 having intermediate dimensions corresponding to the geometric shape of the shapes being manufactured. In the illustrated embodiment, two cavities 11 or 12 are provided for each separating plane 9 or 10.

In the exemplary embodiment shown, a duct 13 is provided in the center of the device 2, which is used to feed the dissolved synthetic material / plastic toward the cavities 11 and 12. The channel 13 starts at an outwardly opening entry point 14 adjacent to one surface of the device 2. It extends first in the device 2 4 to the separating plane 9 and then further in the inner part 2 of the device 5 to the separating plane 10. the filler, after being cooled and molded, can be easily separated from the channel 13, it is itself formed on the basis of a drawing in both parts in the form of a cone. The channel 13 exits the partial channels 15 or 16, which lead to the cavities 11 and 12. The partial channels 15 and 16 are generally located in the interpreting planes 9 and 10.

The device of the invention fig. 1 is shown in the working position. He works, for example, as follows:

The three parts of the device 2 are firmly attached to each other in the working positions 4, 5 and 6. They are pressed together by a pressure generator, in particular into a holding plane 17, which acts as a rigid device to which the front part 2 of the device is attached 4. For the production of molds in cavities 11 and 12, device 1 is pushed to the device 2. The molten synthetic material contained in the injection molding device 1 can be extruded into a passage 13. It fills through passage 13 as well as partial passages 15 and 16 in cavities 11 and 12. When the cavities 11 and 12 are filled with sufficient pressure, the injection molding machine is closed. The synthetic material in the device 2 is then cooled.

After sufficient time for repulsion, the device 2 is opened, for example, in the separating plane 9. However, its parts 5 and 6 remain locked to one another by virtue of the lock shown below. They can, after switching off the compression force produced by the pressure generator, together with the movably supported pressure plate 7, be introduced into Fig. B of _e EN 5316. 2 visible position. The locking, meanwhile, is so advantageously completed that, after the compression force of the pressure generator 8 is interrupted, the remaining force 5 and 6 of the device 2 remain together. The molded bodies produced in the cavities 11 can now be removed from the device 2. The remaining plastic / plastic filler remaining in the duct 13 at the front of the device 2 is removed, for example by compressed air, so that this duct 13 remains free again.

The device 2 is then returned to its pattern. 1 in a visible closed or working position in which its parts 4, 5 and 6 are strongly compressed against one another by means of a pressure generator 8. The cavities 11 are again filled with synthetic material. Finally, the lock is operated such that parts 5 and 4 of the device 2, like parts 5 and 6 described above, are locked to each other. The device 2 is then opened into the separable plane 10 while the pressure plate 7 to FIG. Only the posterior portion of the foot 3 is moved in visible position 3. The prepared molds can be removed from the cavities 12. Meanwhile, the synthetic material is cooled in the cavities 11 of the separable plane 9. The filler in the inner part 5 of the channel 13 is again removed using compressed air.

The device 2 is again returned to its locked or working position according to Fig. 1. The cavities 12 are again filled with synthetic material and the parts 5 and 6 are locked together. Meanwhile, the cavities 11 are molded and the device 2 is opened as described above into the interpreting plane 9. In this way, the cavities 11 and 12 are supplemented with synthetic material and, after cooling, are formed.

For the cooling of the synthetic material in the cavities 11 and 12, as described above, it is necessary that the respective parts of the device 2 be locked each time after the compression force applied by the pressure generator 8 is interrupted. For this purpose, a locking device according to fig. 4 and 7 on at least one side of the device 2, most preferably on at least two different sides thereof. The structure and mode of operation are described below.

The lock consists of a schematic representation of Fig. 4, in which the device of the device 2 is depicted in two parts in a locked or working position, one motor 19 with a rod-shaped piston 18 and two two-piece bar-enclosed terminal devices K. The piston 18 extends towards the axis 2 of the device. In this position, it can be moved between two end positions. Each clamping mechanism K has a holder 20 or 21 extending first to the axis 2 of the device, with a holder 20 attached to one front portion 4 and a holder 21 to the rear portion 2 of the device. As second parts of the clamping mechanism K in the area of separable planes 9 and 10, supports 22 and 24 on the one hand and 24 and 25 on the other. There must be at least one support for each clamping mechanism K. The distance between the two supports corresponds to the width of the holder 20 and 21. the second part belonging to the locking position, thus being locked into the supports of the clamping mechanism K, while being slid between the two supports. The bracket 20 or 21 has two clamping bodies R at one of its free ends - there should be at least one clamping body - slidably mounted along, in or in the direction of the length of the bracket.

The clamping body R is generally in the form of a roll or shaft and is freely pivotable, displaceable along the axis 2 of the device, mounted on the respective holder 20 and

21. At rest, they come from the bracket profile as shown in fig. 4 on the right-hand side for the holder 20 and the piston 18 are moved outwards as shown in FIG. 4, left for bracket 21 and supports 24 and 25.

The piston 18 is pushed in the direction of the double arrow 26 between the two end positions, and thus in opposite directions. In one of them, fig. In the final position shown, the piston 18 engages the clamping mechanism K in the region of the separable plane 10 by locking the inner part 5 and the rear part 6 of the device 2. It also has, as mentioned above, rolls R extending from both sides of the holder 21, Since the rollers R stored in the holder 21 are freely rotated and moved sideways, without the piston 18 therebetween they are pulled out by the holder 21 from the supports 24 and 25 and then restored to it in the corresponding resting state. in the bracket as shown for bracket 20.

The interaction of the clamping mechanism K and the piston 18 is further explained by the examples in FIG. 8 and 9, in which the end of the holder 20 is enlarged.

The end bracket K of the clamping mechanism has an incision 27 extending somewhere in the middle thereof, which is inserted in the middle and into which the piston 18 engages in the locking position of the clamping mechanism K. . These locations have two roller-shaped clamping bodies R that can be rotated freely and can be slid freely along the holder 20. They may have, in their representative plane, rotating recesses engaging pins 28 which are attached to holder 2 0. In the drawing, profile so that it can be moved past the support 22. The lower roller is depressed by a striated line piston 18 from the holder 20 so that the locking position is behind the support 23.

Each bracket 20 and 21 requires essentially only one clamping mechanism

R. The device part 2 5 also requires only one support, respectively. However, the form of the structure described with symmetry bases, with two clamping mechanisms R and two corresponding supports, is nevertheless useful. The clamping bodies R may have other geometric shapes in addition to the aforementioned roll and shaft shapes.

In a preferred embodiment, two clamping devices K are provided on each side of the device 2 as shown in FIG. 5 one side of the device 2. Unwanted opening of the device 2 into the separating planes during the locking phase is avoided due to the special security. The engine 19 is provided in this embodiment with two pistons 18 which are mounted on a common beam 29 and are respectively synchronously switched to generator 19.

The lock shown above is working - when leaving the working position according to fig. for example:

before switching off the pressure generator 8, both parts 2 and 5 of the device 2 according to fig. 5 are interlocked with each other. Here, both pistons 18 are pushed while the generator 19 is actuated between both rollers of the holder 21. Parts 2 and 5 of the device 2 are thus held together by the pressure generator 8 so that there is sufficient residual force. For removal from the molded bodies in the cavities 11, the device 2 can now be opened at the separating plane 9 as shown in FIG. 2 and 6.

After the cavities 11 have been disassembled, the device 2 is closed again and synthetic material is again injected into the cavity thanks to the active pressure generator 8. The locking of the front part 4 and the middle part 5 of the device is activated until the cavities of the separable plane 10 are formed. The motor 19 also displaces the piston 18 to its other end position, in which it pushes the rollers R of the holder 20 outwardly away from the supports 22 and 23. This locked position of the device 2 is shown in the case of a simultaneously opened detachable plane. 7 for the analogous Fig. 3

Claims (6)

1. A device for injection molding of synthetic material, comprising an injection molding mechanism and an associated device having at least two cavities corresponding to the dimensions of the molds to be produced, the device comprising at least three relatively movable parts extending in the working position along the cavities. the dividing planes perpendicular to the direction of movement of the parts and parallel to each other being fixed to each other while each dividing plane passes through at least one cavity and wherein the device is provided with at least one channel for supplying melted plastic which terminates on one side and, on the other side, at the entrance to the surface of the device, which, when in working condition, is attached to an injection molding mechanism, wherein: - a channel (13) provided in the device (2) which extends from the entrance (14) to the first separable plane (9) and further to the second separable plane (10) from which the partial channels (15) extend to the cavities (11,12). , 16), and - the device (2) has a lock (2, 5, 6) between the two positions, locking only the middle part (5) and the front part (4) of the channel (13) with the inlet (14) in one position; ), and in the second position only the middle (5) and rear (6) parts of the device (2) are interlocked. 2. Device for injection molding of synthetic material, comprising an injection molding mechanism and an associated device having at least two cavities corresponding to the dimensions of the molds to be produced, the device comprising at least three front, middle and positively movable parts which, in their working position, are fixedly pressed against one another by a pressure generator acting along parallel dividing planes, and having at least one channel for supplying the dissolved synthetic material, which terminates on the one hand and on the other , which, when in working condition, is attached to an injection molding mechanism with a locking device, which is locked in the first position by switching off _n EN 5316 B pressure generators for the central part of the device and the duct entrance for the front part of the device, and for the second position only the middle and rear part of the device for: - that at least one motor (19) is provided at the center (5) of the device (2) with at least one damper (18) extending towards the axis of the device (2), which can be displaced by two motors (19) two end positions, - that the device (2) is further provided with at least one clamping mechanism (K) in the area of each partitioning plane (9, 10), respectively, with one part of the device (2) mounted on the middle part (5), the second part interacting with the first part is fixed on one side to the front part (4) of the device (4) and on the other part to the rear part (6) thereof, - that at least one support (20, 21) extending axially to the device (2) is attached to the front (4) and rear (6) of the device (2) as a second part of the clamping mechanism; ) extending at one end to the respective first part of the clamping mechanism / device (K) and having at least one clamping body (R) at this end, and - that the damper (18) performs locking function of the clamping body (R) with its corresponding clamping mechanism (K) in one of its end positions, respectively. 3. Device according to claim 2, characterized in that in the area of each divisible plane (9, 10) there are two spaced apart clamping mechanisms (K) and two pistons attached to the device (2). Device according to Claim 2 or 3, characterized in that at the ends of the brackets (20, 21) which engage in the locked position of the device (2) on respective parts of the clamping mechanism (K), there is at least one slidable axis along the axis of the device (2). a clamp body (R) which engages in a locking position behind a rigid support (22, 23, 24, 25) forming the first part of the respective clamping mechanism (K) and attached to the middle part (5) of the device (2). 5. A device according to claim 4, characterized in that the clamping body (R) is generally in the form of a roll or shaft and rotates freely about its axis. 6. Device according to claim 4 or 5, characterized in that two opposing brackets (20, 21) are provided with clamping bodies (R) and that two corresponding supports are attached to the inner part (5) of the device (2). (22, 23 or 24, 25).