DE102008022814A1 - Injection molding device useful for the production of file and/or rasps for the tooth root treatment, comprises a replaceable head having a first locking means, and an injection molding block having a second locking means - Google Patents

Abstract

The injection molding device comprises a replaceable head (1) having a first locking means (8) and an injection molding block (2) having a second locking means (10). The locking means form a locking system for the replaceable head on the injection molding block. The replaceable head comprises an injection molding form with a cavity. The injection molding form is interchangeably arranged in the replaceable head. The first locking means on the replaceable head is a locking pin and the second locking means is a rotatable bolt, which has a locking groove for the locking pin. The injection molding device comprises a replaceable head (1) having a first locking means (8) and an injection molding block (2) having a second locking means (10). The locking means form a locking system for the replaceable head on the injection molding block. The replaceable head comprises an injection molding form with a cavity. The injection molding form is interchangeably arranged in the replaceable head. The first locking means on the replaceable head is a locking pin and the second locking means is a rotatable bolt, which has a locking groove for the locking pin. The device comprises an auxiliary locking means, which are formed on the replaceable head and on the injection molding block in the form of a bevel, and a drive (20), which is actuated by a lever to auxiliary locking mechanism. The drive is arranged on opposite side of the injection molding block as the replaceable head. A guiding groove for the first locking means is equipped at the injection molding block. A guiding pin is equipped on the injection molding block for inserting the replaceable head, which has an opening corresponding to the guiding pin. A connection is intended for the injection molding machine. A lever for the drive is arranged for actuating the locking system on the adjoining side of the injection molding block as the connection for the injection molding machine. The injection molding block comprises injection molding canals, which correspond to the cavity canals in the replaceable head. The replaceable head is aligned through the locking system on the correspondence of the injection molding canals with the cavity canals for injection molding block. A heating device is arranged for heating the injection molding block and/or the replaceable head. The injection molding block and/or the replaceable head is made of aluminum.

Description

object The present invention is an injection molding apparatus at least one removable insert and at least one injection molding block.

in the In the prior art, injection molding devices are known which or multi-part injection molds. The cavities for the too forming products are composed by all parts of the injection mold educated. To demould the finished sprayed product, the individual parts of the injection mold are opened. Such injection molds according to the state The technique is common at the end of an injection molding machine, in particular the extruder Machine arranged.

One Problem with the use of injection molding devices according to the state The technique is the very complex to perform mold change. Usually the shapes are due to the sometimes very high pressures Massive injection molding process and accordingly consuming on an injection molding or the Injection molding machine itself attached. In case of product change or wear of the injection mold This elaborate attachment must be solved and after attaching the new injection mold can be reinstalled. This way lasts the change is very long and represents an unproductive death time of the Machines

task The present invention is intended to solve the problems of the prior art Technology to solve. In particular, it is an object, an injection molding apparatus with a Interchangeable insert available to put, which quickly, easily, easily and safely changed can be.

Is solved this object by an injection molding device with the features of claim 1.

A Injection molding device according to the invention therefore has at least one interchangeable insert and at least one Injection molding block on. The replacement insert has at least a first Locking means and the injection molding block at least a second Locking means on. The two locking means form together a locking system which the interchangeable insert on the injection molding block attached. By the necessary correspondence of the first locking means with the second locking means can be ensured that only intended replacement inserts in the Injection molding device according to the invention can be used. change adapters from wrong material or, for example, wrong channel assignment, can by the design of the locking means of the use be excluded at the injection molding block.

By the division of the locking system on the two elements Interchangeable insert and injection molding block can also save material be achieved. Advantageously, the more expensive part of the Locking system once as a second locking means in Injection molded block executed. The simpler part of the locking system can be used as the first locking means with any number of exchangeable inserts to be appropriate.

The already existing on the two elements locking system provides besides that sure all Elements for the secure attachment of the interchangeable insert are necessary in the Attachment of the interchangeable insert are also present. A complicated to disposal provide additional Elements, such as screws, nuts or clamps can stay here.

One Another advantage is when in an injection molding apparatus according to the invention the replacement insert at least one injection mold with at least a cavity having. Injection mold in the context of the present invention the part of the interchangeable insert in which there is at least one cavity, So the part, which for the injection molding process and the product is relevant. Cavity in the frame of the present invention means that in the injection mold a cavity exists with the negative mold of the product to be sprayed. Preferably, the injection mold is designed in two parts, wherein As known from the prior art, the cavity for the product of both parts the injection mold is composed. In the big advantage over injection molds However, the prior art does not require the product directly in the Connection to be removed from the injection molding process, since the entire Removable insert removed from the injection molding device and through a fresh, viz with empty cavities can be replaced. Thus, a system is provided in which on the one hand the possibility In the case of difficult injection molding processes, the sprayed products exist not to have to demould right after, but on the other hand, a fast change and associated low death times of the Injection molding machine possible are. Removing the replacement insert with ready-sprayed Products without opening The injection mold can be useful if, for example, sensitive Materials for were used in the injection molding process, which has a special over the Time required temperature course for the cooling phase need.

It is also advantageous if the injection mold is interchangeable in the replacement insert is done. In this way, for example, in a replacement insert different injection molds for different products can be used. In addition, this embodiment has the advantage that worn injection molds can be replaced in a simple manner, without replacement of the expensive and large replacement insert is necessary. The injection molds are fixed for example by means of a clamping or screw in the removable insert.

at an injection molding device according to the invention For example, the first locking means may be used on the interchangeable insert be designed as a locking bolt. Such a locking bolt is available one side of the interchangeable insert and can with a second Locking means correspond. The locking bolt can do this have a substantially cylindrical outer contour. However, they are also conical outer contours or outer contours from composite geometries or elaborate profile structures within the scope of the invention conceivable.

In Communication with the first locking means is advantageously the second locking means designed as a rotary latch. One Such rotary latch advantageously has a locking groove for a Latch bolt or a similar designed first locking means. When using a Turning bolt for the second locking means may be the operation of the locking system take place by a rotational movement. This has the advantage that rotational movements in a much simpler way over stretching or transmitted through the injection molding block, for example can be as is the case with translation movements. The usage a rotary bolt therefore allows a simpler and cheaper Design of an injection mold according to the invention. In one embodiment are latch groove, rotary latch and locking bolt designed such that when actuated Locking system of the insert in all directions firmly on Injection molded block is fixed.

Around an injection molding device according to the invention To further improve, it may be useful to change the use and / or on the injection molding block in addition Locking aids are provided. These locking tools serve the security of the locking system even further to increase. One embodiment of such locking aids is the provision in a slope on the replacement insert and on the injection molding block. This incline is for Injection molded block inclined and, for example, as a wedge-shaped depression executed in this. If the replacement insert is inserted into this wedge-shaped bevel, it slips automatically along the slope in the for the locking system right position. In the locking position serves the slope additionally to keep the changeover there and the great forces, which during the injection molding process, over the big surface of the slope dissipate. By providing such locking aids, in particular of corresponding large-scale slopes can the power flow during the injection molding process intercepted over these surfaces and the locking system can be spared in this way. The locking aids therefore form an abutment for the replacement insert.

Advantageous it may be when in an injection molding apparatus according to the invention a Gear is provided, which can actuate the locking mechanism. In particular, it is advantageous to provide a lever which over the Transmission actuates the locking mechanism. Such a transmission can be configured in any way and is in particular adapted to the configuration of the locking system. A possibility is the configuration of the transmission as a mechanical deflection. In This case is about lever systems a movement from a single hand-operated Lever is running, transferred to the locking system. In the context of the present invention, however, other types of transmission are such as gear transmission or when necessary large power transmission Planetary gear conceivable.

The Transmission is advantageously mounted on another side, as the exchange insert. In particular, the gearbox is on the opposite side Side attached. The local Separation of the gearbox from the interchangeable insert allows a free Workspace to create around the change use. Disturbing elements of the gear are out of, for Removing the replacement insert necessary work area removed.

Around a fast and safe insertion the interchangeable insert in the injection molding block can ensure it may be advantageous that at least one guide groove on the injection molding block for the first locking means is provided. This guide groove can be designed with parallel or tapered walls. It serves that The interchangeable insert can be used quickly and still through this leadership in the for the locking system necessary exact position is performed.

It is also advantageous if at least one guide pin is provided on the injection molding block, which further facilitates the insertion of the interchangeable insert and which corresponds to an opening in the interchangeable insert. Such a guide pin can before the changeover center, while the final exact positioning is also realized either by the guide pin or, for example, a guide groove for the first locking means.

Around an injection molding device according to the invention for one To be able to use injection molding process it is advantageous directly in the device a connection for an injection molding machine provided. This connection communicates advantageously with the nozzle an extruder of the injection molding machine. To the exact position of Injection molding machine and its nozzle To set the injection molding device, can also fixation elements such as For example, fittings may be provided which the injection molding device and firmly connect the injection molding machine.

Of the Lever for a gear for the operation of the Locking system is advantageously on another side the injection molding block, in particular the adjacent side, as the connection for arranged an injection molding machine. Usually the connection is for the Injection molding machine through the direct contact to the nozzle of the extruder hottest Place during the injection molding process. Also before and after the injection molding process the working temperature in this area is in an injection molding device according to the invention the highest be. To avoid burns of the operator is the Lever advantageously wise spaced from this area on the Spritgussvorrichtung appropriate. about The transmission is thus a safe operation of the locking system possible.

advantageously, injection molding channels are provided in the injection molding block. In exchange are Advantageously provided Kavitätskanäle. The injection channels in the injection molding block serve to forward the liquid injection molding material in the injection molding block, while the cavity channels in the exchange insert to forward the injection molding material into the cavities. When inserted replacement insert corresponding injection molding channels and Kavitätskanäle in one Form that the exit of the injection molding channels on the injection molding block itself essentially coincides with the entrance of the Kavitätskanäle at the exchange insert. Advantageously, the cross sections of all injection channel and Cavity channel inputs identical and the centerlines of the entrances and entrances coincide. These Design has the advantage that, despite the two-part Arrangement an undisturbed Stream of liquid injection molding material to the place of destination, namely the cavities guaranteed is. The distinction between injection molding channels in the injection molding block and cavity channels in the interchangeable insert has another advantage. In this way, cavity channels in the exchange can be so short as possible being held. The cavity channels are also filled with injection molding material after injection molding. The Material in these Kavitätskanälen is However, no part of the finished product and thus represents waste and thus material loss. Unlike injection molding devices From the prior art, by separating injection molding channels and the Cavity channels the length of Cavity channels and thus Material loss is reduced to a minimum.

Around ensure that the injection molding process without pressure loss or other flow problems expires It may be advantageous if the locking system on the first and second locking means in addition to locking the removable insert Aligns to the injection block. This alignment is advantageously done in the way that they have the necessary correspondence between the entrance the cavity channels and the outlet the Spritzgusska channels will be produced. This alignment can be supported, for example by the arrangement and configuration of the guide grooves and / or the guide pins.

at Injection molding devices according to the invention becomes fluid Injection molding material, especially thermoplastics used at temperatures above 150 ° C. To ensure that after the leakage of liquid injection molding compound from the nozzle of the extruder, on the way through the injection molding channels of the injection molding block to the cavities the injection mold of the thermoplastic does not harden and clog the injection channels, it makes sense at least one heater for injection molding and / or for the To provide a replacement insert. Such a heater has the further advantage that during the set-up times, namely when replacing the replacement insert the material in the injection channels itself not solidified, but the injection molding process for the next production batch immediately after inserting the next Changeover can begin. Also a cleaning of the injection molding block is facilitated by the provision of the heater. So can after Removing the injection molding machine, for example, with compressed air or incompressible cleaning agents from the liquid injection molding compound injection channels depressed become. The provision of heating elements on the exchange insert can be advantageous be accurate to exact cooling temperature to adjust the injection molding process.

Around Ensure that the heat sensitive System of the injection molding device, the heat, in particular the heater also the injection molding channels achieved, it may be useful both the injection molding block, as also the changeover for the most part Made of a material to finished, which has good or very good thermal conductivity having. An advantageous choice of material is, for example, aluminum.

For example, injection molding devices according to the invention can be used used to make files and / or rasps for tooth root treatment.

The injection molding apparatus according to the invention will be explained in more detail with reference to FIG 1 to 5 :

1 shows an embodiment of an injection molding device according to the invention in the oblique view

2 shows the embodiment 1 from the top view diagonally above

3 shows the section of a removable insert with four injection molds in plan view

4 shows an embodiment of a second locking means

5 shows a side view of the embodiment 1 with a partial section through replacement insert and injection molding block.

1 shows an embodiment of an injection molding device according to the invention 3 , The injection molding device 3 has an injection molding block 2 and a changeover insert 1 on. The replacement insert 1 is shown floating above the injection molding block. This position contains the replacement insert 1 , just before he manually by the operator in the injection molding block 2 is used. At the side of the interchangeable insert 1 are two locking devices 8th in the form of locking bolts 8th educated. These locking bolts 8th fit in the guide grooves 5 which in the plan view in 2 can be seen. 2 shows the injection molding device 3 with inserted replacement insert 1 ,

For the additional and improved pre-centering of the interchangeable insert 1 includes an injection molding apparatus according to the embodiment in 1 spigot 4 on, which with openings at the bottom of the interchangeable insert 1 interact. The replacement insert 1 When inserting, first with the openings on the bottom of the guide pin 2 put on and thus pre-centered. Next slide the locking bolts 8th almost automatically into the guide grooves 5 and the exchange insert 1 is guided to its exact locking position.

On the changeover insert 1 opposite side of the injection molding block 2 is a transmission 20 arranged. This gear 20 is, as well as off 2 apparent, a simple mechanical lever mechanism. The lever mechanism 20 is about a lever 22 on the side of the injection molding block 2 served. It can be the translational movement of the lever 22 over the transmission 20 and transmit two small levers as rotary motion to two locking systems. The locking system in the embodiment according to the enclosed 1 to 5 consists of the two locking bolts 8th and two corresponding rotary bolts 10 , what a 1 visible and in 4 are shown in more detail. The rotary latch 10 has a central axis, around which at least partially a locking groove 11 extends. The locking groove 11 works with the locking bolts 8th together. 5 shows in cross section the locking system in the locked position. The rotary latch 8th communicates with the transmission 20 on the back of the injection molding block 2 , As in 5 shown, the rotary latch is in the locked position in the rotated position. The locking bolt 8th is in the latch groove 11 guided and part of the rotary latch 10 locks the locking bolt 8th the way to leadership 5 , The replacement insert 1 can not be lifted in this position of the locking system. To the exchange use 1 The operating personnel can change over the lever 22 and the gearbox 20 the rotary latch 8th rotate and pave the way for the latch bolt 8th about the leadership 5 release upwards.

In the execution according to the 1 to 5 the locking system is only used to lock against lifting the removable insert 1 , To pull out the exchange insert 1 In addition, slopes are to be avoided 12 provided, which the exchange use 1 in the inserted state against the injection molding block 2 to press. In combination with the locking aids, namely the bevels 12 , is the interchangeable insert 1 in a precisely defined position when the locking system is closed.

In exchange 1 are four injection molds 14 arranged. These are designed as small units, in exchange 1 inserted and fixed over small screws. Every injection mold 14 again has cavities 16 for the products. Per cavity 16 is a cavity channel 28 , like out 3 seen, provided. Each cavity channel 28 communicates with its input with the output of a corresponding injection channel 26 in the injection molding block 2 , A total of sixteen cavity channels and thus also sixteen corresponding injection-molding channel openings are present.

On the back of the injection molding block 2 is a connection 24 intended for an injection molding machine. When using the injection molding device 1 is at this connection 24 the nozzle of an extruder connected to an injection molding machine. From this nozzle, the liquid injection molding material is conveyed. For the production is a change use 1 over the guide pins 4 pre-centered and by means of the locking bolts 8th and the guide grooves 5 introduced into the locking system. With insert inserted 1 gets over the lever 22 and the gearbox 20 the locking system is actuated and the interchangeable insert 1 locked in its exact position. In this exact position, the inputs of the cavity channels correspond 28 with the outputs of the injection channels 26 , In the next step is over the nozzle of the extruder of the injection molding machine and the connection 24 on the injection molding block 2 liquid injection molding material through the injection molding channels 26 and the cavity channels 28 into the cavities 16 the injection molds 14 injected. After complete filling of the cavities 16 , which represents the completion of the injection molding process, no additional material from the extruder is replenished, the entire injection molding block 2 however, is maintained at a temperature by a heater at which the injection molding material is substantially liquid. About the lever 22 the locking system is released and the interchangeable insert 1 can along the guide pins 4 and the guide grooves 5 from the injection molding block 2 be lifted off. The replacement insert 1 with the filled cavities 16 can now be prepared for cooling the sprayed products. Subsequently, a new replacement insert 1 with injection molds 14 with empty cavities 16 in an identical way in the injection molding block 2 inserted and locked. The next injection molding process can take place after a replacement of about 5 minutes.

Both the interchangeable insert 1 as well as the injection molding block 2 are at the injection molding device 3 the embodiment of the 1 to 5 made of aluminum.

1

change insert

2

injection block

3

injection molding machine

4

spigot

5

guide

6

locking system

8th

locking bolt

10

Spagnolet

11

locking notch

12

slope

14

injection mold

16

cavity

20

transmission

22

lever

24

connection for injection molding machine

26

injection channels

28

Kavitätskanäle

Claims (18)

Injection molding device ( 3 ) comprising at least one interchangeable insert ( 1 ) and at least one injection molding block ( 2 ), whereby the interchangeable insert ( 1 ) at least a first locking means ( 8th ) and the injection molding block ( 2 ) at least one second locking means ( 10 ) and wherein the locking means ( 8th . 10 ) together a locking system for the interchangeable insert ( 1 ) on the injection molding block ( 2 ) form. Injection molding device ( 3 ) according to claim 1, characterized in that the interchangeable insert ( 1 ) at least one injection mold ( 14 ) with at least one cavity ( 16 ) having. Injection molding device ( 3 ) according to claim 2, characterized in that the injection mold ( 14 ) in the exchange insert ( 1 ) is mounted replaceable. Injection molding device ( 3 ) according to one of the preceding claims, characterized in that the first locking means ( 8th ) at the exchange insert ( 1 ) a locking bolt ( 8th ). Injection molding device ( 3 ) according to one of the preceding claims, characterized in that the second locking means ( 10 ) a rotary latch ( 10 ). Injection molding device ( 3 ) according to claim 5, characterized in that the rotary bolt ( 10 ) a locking groove ( 11 ) for the locking bolt ( 8th ) having. Injection molding device ( 3 ) according to one of the preceding claims, characterized in that additional locking aids are provided, which in particular at the exchange insert ( 1 ) and on the injection molding block ( 2 ) in the form of a slope ( 12 ) are formed. Injection molding device ( 3 ) according to one of the preceding claims, characterized in that a transmission ( 20 ) is provided, which in particular by means of a lever ( 22 ) can operate the locking mechanism. Injection molding device ( 3 ) according to claim 8, characterized in that transmission ( 20 ) on another side, in particular on the opposite side of the injection molding block ( 2 ) is arranged as the exchange insert ( 1 ). Injection molding device ( 3 ) according to one of the preceding claims, characterized in that the injection molding block ( 2 ) at least one guide groove ( 5 ) for the first locking means ( 8th ) is provided. Injection molding device ( 3 ) according to one of the preceding claims, characterized in that the injection molding block ( 2 ) at least one guide pin ( 4 ) for inserting the interchangeable insert ( 1 ) is provided, wherein the Wechselein sentence ( 1 ) has at least one, with the at least one guide pin corresponding opening. Injection molding device ( 3 ) according to one of the preceding claims, characterized in that a connection ( 24 ) is provided for an injection molding machine. Injection molding apparatus according to claim 12, characterized in that a lever ( 22 ) for a transmission ( 20 ) for the operation of the locking system ( 6 ) on another side of the injection molding block ( 2 ), in particular the adjacent side as the connection ( 24 ) is arranged for an injection molding machine. Injection molding device ( 3 ) according to one of the preceding claims, characterized in that the injection molding block ( 2 ) Injection molding channels ( 26 ), which when inserting ( 1 ) with in this change use ( 1 ) existing cavity channels ( 28 ) correspond. Injection molding device ( 3 ) according to claim 12, characterized in that the interchangeable insert ( 1 ) by the locking system on the correspondence of the injection molding channels ( 26 ) with the Kavitätskanälen ( 28 ) to the injection molding block ( 2 ) can be aligned. Injection molding device ( 3 ) according to one of the preceding claims, characterized in that at least one heating device for heating the injection molding block ( 2 ) and / or the replacement insert ( 1 ) is provided. Injection molding device ( 3 ) according to one of the preceding claims, characterized in that the injection molding block ( 2 ) and / or the replacement insert ( 1 ) is made largely of material with good or very good thermal conductivity, in particular aluminum. Use of an injection molding device ( 3 ) with the features of one of claims 1 to 15 for the production of files and / or rasps for tooth root treatment.