DE102007050689B4 - Injection molding machine with a force-absorbing closed system and closing unit for an injection molding machine - Google Patents

Abstract

Injection molding machine (110) with a clamping unit (100) and an injection unit (101), in which a frame with side walls (1) and cross members (5, 14) connecting the side walls (1) to each other as a closed system are used by the clamping unit (100) applied forces, whereby the forces of the clamping unit (100) absorbed by the frame are not only the clamping forces, but at the same time the mass forces of some or all of the movable parts of the clamping unit (100), which mass forces through the side walls (1) and / or the traverses (5, 14) are carried, for which purpose guide rails (6) are provided in pairs above and below for these parts on the side walls (1), and in which a frame with side walls (1) and the side walls ( 1) connecting trusses (5, 14) as a closed system absorbs the forces applied by the injection unit (101), the forces being absorbed by the frame the injection unit (101) is not only about the injection forces, but at the same time about the inertial forces of some or all of the moving parts of the injection unit (101), which inertial forces are borne by the side walls (1) and / or the cross members (5, 14) what purpose on the side walls (1) and / or the cross members (5, 14) holding, guiding and / or fastening elements (15) are provided for these parts.

Description

The invention relates to an injection molding machine according to claim 1. In addition, the invention relates to a closing unit for an injection molding machine according to claim 14.

Injection molding machines are known in many embodiments from the prior art and usually have to transmit the force generated by a closing mechanism four cylindrical spars. The disadvantage here is that these spars are located within the space between the platens and therefore limit the size of the molds.

Also known are tie-bar less injection molding machines, in which the locking mechanism and the platens are arranged in a C-shaped machine frame. Such a tie-bar injection molding machine is for example in the AT 391 293 B described. The advantage of such a barless injection molding machine, namely the easier accessibility of the space between the tool platens, faces the disadvantage that the machine frame of such an injection molding machine must be executed in a costly solid construction in order to prevent bending of the legs of the machine frame under the action of the closing force , At the same time complex mechanisms are required to ensure the required parallelism between the platens.

Another injection molding machine is in document DE 202 13 992 U1 described. There is provided as part of a rectangular frame extending in the machine direction C-bracket, which is claimed by the closing force to train. The distance of the C-bracket from the periphery of the platens is large enough to provide a space for the introduction or arrangement of equipment. A disadvantage of the solution described therein is that a machine bed is needed to carry the inertial forces of the closing and injection unit and to ensure a parallelism of the mold platens during the injection process.

The following, already known solutions have the above-mentioned disadvantages.

In JP H08-215826 A a device for adapting a closing unit for an injection molding machine is described. The clamping unit is guided in a massive, one-piece frame construction.

In JP H07-60812 A It is described that a closing unit of an injection molding machine is arranged in a solid housing consisting of a single casting.

Out US 2005/0019443 A1 an injection molding apparatus is known, with an injection unit and a rotatable table, on which various molds are arranged with associated clamping units. The injection unit is arranged between two side walls, wherein the side walls are interconnected for additional stabilization via trusses.

An object of the present invention is to provide an injection molding machine which does not have the above-mentioned disadvantages.

This object is achieved by an injection molding machine according to claim 1. Thereafter, an injection molding machine is provided with a closing unit, with an injection unit and with a frame for the closing unit and / or with a frame for the injection unit, wherein the frame for the closing unit has at least two side walls and the side walls interconnecting trusses and forms a closed system such that it receives the forces applied by the closing unit and wherein the frame for the injection unit has at least two side walls and the side walls interconnecting trusses and a closed system forms such that it absorbs the forces applied by the injection unit. In the event that both the forces of the closing unit, and the forces of the injection unit to be recorded, both two separate racks, as well as a common frame for closing and injection unit can be used.

At the same time, the side walls and / or the trusses carry the mass forces of some or all moving parts of the clamping unit and / or the injection unit. For this purpose, holding, guiding and / or fastening elements for these parts are provided on the side walls and / or the trusses. In other words, the side walls and / or the trusses serve not only to absorb the forces of the injection and / or closing unit, but also as supporting elements for essential parts of the injection molding machine, in particular the movable and the stationary platen. This direct connection to the side walls or trusses eliminates the need for expensive and expensive additional mounting or mounting devices, which further reduces the overall cost of the machine. According to the invention, guide rails are provided in pairs at the top and bottom for receiving the forces of the closing unit on the side walls.

In addition, the object is achieved by a clamping unit according to claim 14.

In other words, one of the core ideas of the invention is not to divert the forces acting in the injection molding machine through bars, but rather through a closed system in the form of a frame. The term "closed system" in this context means on the one hand that the frame is not an open, for example C-shaped frame or the like, and on the other hand that during operation of the machine by the clamping unit and / or the injection unit introduced forces are substantially completely absorbed by the frame and therefore no or only a comparatively very low transmission of these forces in the machine bed or machine frame takes place. This thus serves only to support the closed system and therefore must be performed much less massive and torsionally rigid and less high quality work, which reduces the overall cost of the injection molding machine. The closing or injection unit can thus be used with almost any machine bed.

With the help of the invention, the advantages of holmloser injection molding machines, in particular the simple tool installation and removal, as well as the advantages of conventional injection molding machines with four bars, in particular the uniform force distribution unite.

With the invention, an injection molding machine is provided, in which the space between the platens is fully usable. Another advantage is that the forwarding of the closing or spraying force does not take place over the machine frame. The forces are kept in the closed system. A bending of the closed system, as was the case with a C-frame, is excluded. Compared to other solutions, the invention is also characterized by the fact that the parallelism of the tool platens is guaranteed without additional mechanisms.

Advantageous embodiments of the invention are specified in the subclaims.

The frame of the closing or the injection unit preferably consists of two side walls. Traverses are distributed in any number between the side walls so that there is a closed system for absorbing the forces of closing or injection unit. By a targeted, in any number of attaching traverses between the side walls a very flexible stabilization of the frame and an adaptation to different machine parameters is possible. The trusses can have different lengths, so that the frame width can be varied. The force is introduced into the side walls, for example via bolts or wedges, which serve to connect the trusses with the side wall. The force of the closing or injection unit is then taken up between the trusses and distributed in the closed system (sidewalls with trusses). For this purpose, the traverses are preferably arranged symmetrically. The entire system thus absorbs the forces of the closing or injection unit and, in the interaction of side walls and trusses, gives the system the requisite elasticity which is required for the buildup of force, as in the case of a toggle lever drive. Figuratively speaking, the entire system absorbs the elongation of the conventional spars with the help of its inherent elasticity.

The injection molding machine comprises a stationary platen and a movable platen for receiving the mold halves, wherein the movable platen is translationally driven by means of a drive. The drive may be the closing mechanism or a separate rapid traction drive. With regard to the forces applied by the closing unit, it has proven to be particularly advantageous if the stationary platen and the supporting element of the drive are firmly connected to the side walls of the frame such that the closing force of the closing unit on the fixed mold clamping plate on the closed system is directed.

For a particularly simple, safe and yet reliable attachment of machine parts to the frame guides are provided on the side walls. In particular, for receiving the movable platen mounted directly on the inner sides of the side walls of the frame for the clamping unit guides on the guide carriage, the movable platen is coupled. In other words, the side walls serve not only for transmitting the closing forces, but at the same time for guiding the movable platen. Preferably, therefore, form the side walls, the mold clamping plates and all drive components of the clamping unit is a self-contained system for receiving power. The drive of the closing mechanism of the closing unit can also be moved by means of such guides.

Is also a recording of forces of the injection unit provided by the frame, then the machine is preferably designed such that the mobile injection unit of the injection unit is received between the side walls.

In this case, the side walls are preferably attached directly to the fixed platen to initiate the nozzle contact force. This prevents the nozzle contact force from causing the fixed platen to tilt. At the same time, it has proven to be particularly useful to provide on the side facing the attachment of the fixed platen with the side walls, trusses between the side walls, which ensure a defined distance of the side walls to each other.

To accommodate the injection unit between the side walls guides are provided on the side walls of the frame for the injection unit, as described above in connection with the attachment of the movable platen on the frame for the clamping unit.

Regardless of whether the frame is designed solely for receiving the forces of the closing unit, solely for receiving the forces of the injection unit or for absorbing the forces of both units, the following embodiments have proven successful.

The side walls essentially determine the external appearance of the machine. They are preferably designed such that they form a protective lining for the closing and or the injection unit and replace the commonly used mudguards substantially completely. Thus, the use of additional cladding elements is almost or completely unnecessary. If, nevertheless, further cladding elements are needed, for example, smaller additional sheets, they can be mounted very easily and inexpensively. In other words, the protective lining of the closing or injection unit serves to absorb the forces and to form a closed system.

If window-like openings are arranged in the side walls in the area of the tool space of the closing unit and / or in the area of the nozzle space of the injection unit, easy access into the tool space or nozzle space is made possible without thereby impairing the functionality of the frame, in particular its force absorption and mass force carrying function is impaired. The height of the window openings preferably corresponds to the height of the clamping plates, so that the access thereto is greatly simplified. The elimination of the spars also a very simple installation and removal of injection molds between the side walls up and down and to the side is possible.

If the thus provided openings provided with protective doors, high security requirements can be met. The doors are therefore directly connected to the side walls and it requires no additional holding or mounting frame. If the protective doors are movably fastened to a side wall, preferably using a guide arranged on the side walls, then the opening or closing of the window-like openings can not only be particularly simple, but at the same time also very safe and reliable. Instead of openings provided with doors and viewing window can be provided. Doors and viewing windows can also be fastened to the trusses, so that a machine unit that is almost completely closed off the side walls can be created.

If the side walls are identical or mirror-like, the result is a frame of particularly simple construction and therefore inexpensive to produce. At the same time in such a structure, both the inclusion of the injection and / or closing forces, as well as the assembly of the machine parts are particularly easy to implement.

Embodiments of the invention are explained below with reference to the drawings. Hereby show:

1 a first embodiment of the invention with a closing unit,

2 the closing unit off 1 in a cross section in front of the drive for the locking mechanism,

3 a further embodiment of the invention with a closing unit,

4 a mounting unit of side walls and consoles, as shown in the in 3 embodiment shown is used,

5 a closing unit according to a further embodiment of the invention with internal sliding doors,

6 the closing unit off 5 in a cross section between the platens,

7 a further embodiment of the invention with an injection unit, and

8th an injection molding machine with a closing unit according to the invention and an injection unit according to the invention.

All figures show the invention only schematically and with its essential components. The same reference numerals correspond to elements of the same or comparable function.

In the 1 illustrated clamping unit 100 an injection molding machine shows a front and a rear side wall 1 , The side walls 1 have the shape of upstanding plates and extend substantially the entire length of the clamping unit 100 , The side walls 1 are directly with a fixed tool clamping plate 2 and a recording console 3 for the locking mechanism 4 by means of bolts 15 and further stiffening brackets 5 connected. In the locking mechanism 4 it is a toggle locking mechanism with a drive 12 , The stiffening brackets 5 serve as trusses (struts) and form with the sidewalls 1 the frame according to the invention for the closing unit, which receives or transmits the entire power flow in the closing force structure. The frame lies with the side walls 1 on the machine bed 11 the closing unit 100 on. The side walls 1 at the same time serve as a protective covering.

On the insides of the side walls 1 are in the machine longitudinal direction guide rails 6 fixed on which are carriages 7 move. The carriages 7 take a moving platen 8th , a tool height adjustment 9 and a counter bearing 10 for the locking mechanism 4 on. On every sidewall 1 is at least one guide rail 6 intended. For a particularly secure guidance, the guide rails but also on each side wall 1 be arranged in pairs (top and bottom).

How out 2 is apparent, is also the drive 12 for the locking mechanism 4 over carriages 7 on guide rails 6 slidably mounted. Here too, pairs of guide rails (top and bottom) may be provided.

In the 3 illustrated closing unit, here alternatively with a hydraulic locking system 13 shows an embodiment in which the two side walls 1 with the recording console 3 , the stiffening brackets 5 and the force introduction consoles 14 and bolts 15 form a mounting unit. The fixed tool clamping plate 2 is fixed with the force introduction consoles 14 connected. This arrangement has the advantage that sidewalls 1 and consoles 5 and force introduction consoles 14 form a preassemblable unit and the fixed platen 2 adjustable for plate parallelism at the force introduction consoles 14 is attached. In the 4 shown assembly unit consists of the side walls 1 with the by bolt 15 firmly connected recording console 3 , the stiffening brackets 5 and the force introduction consoles 14 ,

The two embodiments described above are thus characterized on the one hand by the fact that the side walls 1 over bolts 15 or wedges with trusses or consoles 3 . 5 . 14 and / or the fixed platen 2 and with the supporting element of the locking mechanism 4 . 13 together give a closed system in which the closing forces are absorbed. On the other hand, the side walls also carry the inertial forces of the moving parts of the clamping unit 100 , For mounting the consoles 3 . 5 and bolts 15 or wedges, etc. are on the insides of the sidewalls 1 machined surfaces and holes provided.

By the arrangement of the side walls 1 left and right next to the stationary platen 2 is achieved that the space up to the moving platen 8th fully usable for the mold. For accessibility to the tool room have the side walls 1 corresponding openings 20 on. In addition, there are more openings for mounting the locking mechanism 4 . 13 intended. The side walls 1 Thus, for their use as part of the closed system, they need not be continuous plate-shaped, but may also have openings. In the embodiments of the invention described herein, the sidewalls are 1 provided with openings such that they each adjacent to a front and a rear vertical strut 21 an upper and a lower horizontal strut 22 include. As long as the side walls 1 form with the trusses a frame that realizes the principle of the closed system, the side walls 1 but also have a different shape. The side walls 1 need not be limited to the shape of a frame. For example, T-shaped side walls are possible, which are composed of a vertical and a horizontal strut.

On the outsides of the side walls 1 are frames 16 for safety doors 17 attached to the tool room. Instead of the frame 16 but also on the outside of the side walls 1 fixed linear guides 18 be used. Alternatively, the protective doors can also be used in linear guides 18 run, which are attached directly to the insides of the side walls. Such an embodiment is in the 5 and 6 displayed. At the upper edges of the side walls 1 are also more linear guides 18 provided in which sliding doors 19 be kept movable. In the area of the locking mechanism 4 are openings in the side walls 20 provided in the form of viewing windows, which are covered by removable lenses or sheets or provided with sliding protective doors. The protective doors 17 can be with each other or with the sliding doors 19 be coupled, so that a joint operation is possible.

The following is an injection unit according to the invention 101 described. The previously valid with respect to the closing unit 100 taken statements analogously. Likewise, the information described above with regard to the guides, the protective panels, the doors, etc. are valid accordingly. These points will therefore not be discussed separately below.

The injection unit 101 working directly with the fixed platen 2 is connected, has a mobile injection unit 23 on, which opens through the fixed 2 platen in the mold.

In the 7 illustrated injection unit 101 shows a front and rear side wall 1 directly with the fixed platen 2 and traverses 5 are connected. For receiving the injection unit 23 between the side walls 1 are on the sidewalls 1 Guided tours provided, as mentioned above in connection with the attachment of the movable platen 8th on the frame for the closing unit 100 have been described. In particular, on the insides of the side walls 1 guide rails 6 fastened, whose carriage 7 the injection unit 23 with the plasticizing unit 24 take up. The side walls 1 lie on the machine bed 11 the injection unit 101 on and are symmetrical by connecting bolts 15 with the fixed tool clamping plate 2 coupled. The connecting bolts 15 are arranged so that the via a pull or push rod 25 applied nozzle contact force tipping the fixed platen 2 does not allow. On the outsides of the side walls 1 are frames 16 for nozzle chamber protection doors 17 arranged.

As it has proven particularly useful on the side 26 of the frame, the attachment of the fixed platen 2 with the side walls 1 opposite, traverses 5 between the side walls 1 provide a defined distance of the side walls 1 ensure each other.

LIST OF REFERENCE NUMBERS

1

Side wall

2

fixed tool clamping plate

3

recording console

4

mechanical locking mechanism

5

stiffening bracket

6

guide rail

7

carriages

8th

movable platen

9

Tool height adjustment

10

thrust bearing

11

machine bed

12

Drive for locking mechanism

13

hydraulic locking system

14

Force application console

15

bolt

16

frame

17

proof doors

18

linear guide

19

sliding door

20

opening

21

vertical strut

22

Horizontal strut

23

An injection unit

24

plasticizing

25

Pull / push rod

26

opposite side

100

closing unit

101

injection unit

110

injection molding machine

Claims (15)

Injection molding machine ( 110 ) with a closing unit ( 100 ) and an injection unit ( 101 ), in which a frame with side walls ( 1 ) and the side walls ( 1 ) interconnecting trusses ( 5 . 14 ) as a closed system that of the closing unit ( 100 ) receives applied forces, wherein it is at the forces absorbed by the frame of the clamping unit ( 100 ) not only about the closing forces, but also about the mass forces of some or all moving parts of the clamping unit ( 100 ), which mass forces through the side walls ( 1 ) and / or the traverses ( 5 . 14 ), for what purpose on the side walls ( 1 ) Guide rails ( 6 ) are provided in pairs above and below for these parts, and in which a frame with side walls ( 1 ) and the side walls ( 1 ) interconnecting trusses ( 5 . 14 ) as a closed system that the injection unit ( 101 ) receives applied forces, wherein it is in the recorded from the frame forces of the injection unit ( 101 ) not only about the injection forces, but also about the mass forces of some or all moving parts of the injection unit ( 101 ), which mass forces through the side walls ( 1 ) and / or the traverses ( 5 . 14 ), for what purpose on the side walls ( 1 ) and / or the traverses ( 5 . 14 ) Holding, guiding and / or fastening elements ( 15 ) are provided for these parts. Injection molding machine ( 110 ) according to claim 1, wherein for absorbing the forces on the trusses ( 5 . 14 ) Holding, guiding and / or fastening elements ( 15 ) are provided. Injection molding machine ( 110 ) according to claim 1 or 2, with a stationary platen ( 2 ) and a movable platen ( 8th ) for receiving the mold halves, wherein the movable platen ( 8th ) by means of a drive ( 4 . 13 ) is translationally driven, and wherein the fixed platen ( 2 ) and the supporting element ( 3 ) of the drive ( 4 . 13 ) fixed to the side walls ( 1 ) are connected. Injection molding machine ( 110 ) according to claim 3, with on the side walls ( 1 ) arranged guides ( 16 ) for receiving the movable platen ( 8th ) and / or for receiving the drive ( 12 ) of the locking mechanism ( 4 . 13 ). Injection molding machine ( 110 ) according to one of claims 1 to 4, wherein the injection unit ( 101 ) a mobile injection unit ( 23 ), which between the side walls ( 1 ) is recorded. Injection molding machine ( 110 ) according to claim 5, wherein the side walls ( 1 ) on the stationary platen ( 2 ) are attached to initiate the nozzle contact force. Injection molding machine ( 110 ) according to claim 6, wherein on the side ( 26 ), the attachment of the fixed platen ( 2 ) with the side walls ( 1 ), trusses ( 5 ) between the side walls ( 1 ) are provided which a defined distance of the side walls ( 1 ) guarantee each other. Injection molding machine ( 110 ) according to one of claims 5 to 7, with on the side walls ( 1 ) arranged guides ( 16 ) for receiving the injection unit ( 23 ). Injection molding machine ( 110 ) according to one of claims 1 to 8, in which the side walls ( 1 ) the essentially complete protective lining for the closing unit ( 100 ) and / or the injection unit ( 101 ) form. Injection molding machine ( 110 ) according to one of claims 1 to 9, with in the side walls ( 1 ) in the region of the tool space of the closing unit ( 100 ) and / or in the region of the nozzle chamber of the injection unit ( 101 ) arranged window-like openings. Injection molding machine ( 110 ) according to claim 10, having at least one protective door provided for opening or closing such a window-like opening ( 17 ) for the tool room or the nozzle chamber. Injection molding machine ( 110 ) according to claim 11, wherein the protective door ( 17 ) movable on a side wall ( 1 ), preferably using a guide arranged on the side wall ( 16 . 18 ). Injection molding machine ( 110 ) according to one of claims 1 to 12, wherein the side walls ( 1 ) are equal or mirror-like. Closing unit ( 100 ) for an injection molding machine ( 110 ), characterized in that a frame with side walls ( 1 ) and the side walls ( 1 ) interconnecting trusses ( 5 . 14 ) as a closed system that of the closing unit ( 100 ) receives applied forces, wherein it is at the forces absorbed by the frame of the clamping unit ( 100 ) not only about the closing forces, but also about the mass forces of some or all moving parts of the clamping unit ( 100 ), which mass forces through the side walls ( 1 ) and / or the traverses ( 5 . 14 ), for what purpose on the side walls ( 1 ) Guide rails ( 6 ) are provided in pairs above and below for these parts. Closing unit ( 100 ) according to claim 14, wherein for absorbing the forces on the trusses ( 5 . 14 ) Holding, guiding and / or fastening elements ( 15 ) are provided.

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