DE102004060203A1 - Manifold - Google Patents

Abstract

The invention relates to a hot runner manifold (1) for use in injection molds, comprising at least two or more moldings (2, 3) with flow channels for a melt, wherein the flow channels of at least two of the moldings (2, 3) are interconnected by tubular spacers , which are provided at their axial ends with flanges (7) which engage in recesses (8) of the moldings, wherein the recesses T-shaped grooves (9), in which the flanges are radially insertable, and in that the flanges Recesses are each secured by a closure part (12).

Description

The The invention relates to a hot runner manifold for use in injection molds containing at least two moldings in each case at least one flow channel for one Melt, wherein the flow channels of the at least two moldings by tubular spacers together are connected, which provide at their axial ends with flanges are, which engage in recesses of the moldings.

In an inlet opening a first shaped body ends in many cases a sprue bush and the outlet opening of the further molded body is in connection with a hot runner nozzle or a subsequent further Manifold.

In many cases pass the hot runner manifolds from solid moldings, in which the flow channels as well the inlet and outlet openings and heating elements are incorporated. They are also embodiments known in which the inlet and the outlet in shaped bodies are incorporated and the moldings with each other by correspondingly long trained pipe sections connected to each other. These pipe sections can also be heated.

For example, in the DE 3937936 A1 It has been proposed to use commercially available tubes and tube connectors, without it being stated in this prior art, how the tube connections can be made in order to meet the actual requirements in hot runner injection molding tools.

One generic hot runner distributor is known from JP 60-143922. This document proposes To provide the pipe ends with flanges, these axially in recesses in front of the estuaries the flow channels insert and the flanges with the moldings of the inlet and outlet openings to screw.

These solution has the disadvantage that it is difficult to manufacture and only limited by the the high injection pressures conditional strength and / or leakage requirements is sufficient.

These The invention has the object to overcome these disadvantages.

After that have the recesses T-shaped Grooves into which the flanges are radially inserted, and the Flanges are in the recesses each by means of a closure part secured.

On this way you can the necessary components assembled very simple modular because they are held in stock can. Strength and / or Leakage problems are caused by the engagement of the flanges of the spacers into the moldings prevented in a simple manner.

The Invention solves this object by the subject matter of claim 1.

advantageous Embodiments are the rest dependent claims refer to.

following The invention is based on embodiments with reference to the drawing using exemplary embodiments described in more detail.

It shows:

1 a schematic view of the installation situation;

2a an exploded view of an end portion of a tubular intermediate piece and the connecting means for connecting the intermediate piece with a molded body; and

2 B a sectional view of the molded body 2a with inserted flange.

1 shows a schematic representation of a hot runner manifold 1 , at least from a first molded body 2 and at least one further shaped body 3 consists. The molded body 2 is with a sprue bush 4 provided, is introduced into the melt. This melt is passed through a flow channel in the first molded body 2 and a tubular intermediate piece 5 in the further molded body 3 passed the melt through its flow channel 19 ( 2 ) in a nozzle 6 leads, which opens, for example, in a not shown cavity of an injection molding tool, not shown.

The intermediate pieces 5 each have middle pipe sections 18 and flanges 7 at their free axial ends ( 2 ).

The hot distribution system, in particular the shaped body 2 . 3 and the spacers 5 are preferably designed for the passage of a melt under high pressure up to 2000 bar at temperatures of more than 400 ° C.

The in 2 exemplified flange 7 is designed as an annular disc, which is integral with the pipe section 18 of the intermediate piece 5 connected is. The preferably metallic annular disk can be attached to the intermediate piece by welding or soldering, for example, or can be formed on it in a forming manner.

2 shows only the molding 3 , The attachment of the intermediate piece 5 at the other shaped body 2 takes place in an analogous way.

The moldings 2 . 3 have to attach the spacers 5 each corresponding to the flanges recesses 8th for inserting the flanges 7 and axially directly to the flanges 7 subsequent axial end portions 18a the pipe sections 18 on.

The recesses 8th are designed so that the annular discs 7 and the axial end portions 18a radial (relative to the flange 7 ) in the insertion direction X in the recesses 8th can be used.

The recesses 8th the molded body 2 have (in the insertion direction considered) in their end T-groove-shaped sections 9 with a transverse leg 10 and a longitudinal leg 11 on, with the T-groove-shaped sections 9 are preferably designed and dimensioned such that the annular discs 7 just straight radially in the transverse leg 10 the T-groove-shaped sections 9 are inserted and secured there against axial withdrawal form-fitting.

The washers 7 could be provided with a seal (eg in the peripheral edge region or axially to the pipe section 18 towards), which may also be designed in the manner of a circumferential sealing lip (not shown).

To 2 are the T-groove shaped sections 9 such that the transverse leg 10 in the insertion direction X is a greater extension or larger than the diameter of the flanges 7 so that these are completely in the transverse legs 10 are insertable.

This in 2 (in the insertion direction) lower end of the longitudinal leg 11 is in the direction of insertion to the outer contour of the pipe sections 18 adapted, ie it is preferably designed semicircular or semi-cylindrical in the ground, so that the end portion 18a of the intermediate piece 5 is handled accordingly in this area. The flow channel 19 for the melt is aligned with the hollow spacer 5 ,

After inserting the flange 7 in its mounting position in the T-groove-shaped section 9 the recess becomes with a closure part 12 locked.

The closure part 12 is in after the insertion of the spacer 5 remaining area of the recess 8th used and is shaped and arranged so that it is the intermediate piece 5 in operation respectively on the associated molded body 3 secures and holds.

For this purpose, it has a shape of the recess 8th corresponding shape and is in his (in the insertion direction x) lower or front area 13 T-shaped in such a way that it is in the T-groove-shaped sections 9 is insertable.

The pipe section 18 in the mounting position facing area 13 is semicircular (semi-cylindrical) designed so that the axial end portion 18a of the pipe section 18 in interaction with the reason of the recess 8th completely enclosed.

Preferably by means of screws 14 that the intermediate piece 5 again in the insertion direction of holes 16 prevail and in corresponding threaded holes 15 in the molding 2 . 3 be screwed, the closure part on the molding 2 . 3 held.

For this purpose, the closure part in its end portion facing away from the intermediate piece in the mounting position 20 be configured such that this end portion of the T-groove-shaped portion 9 completely covered at its free end. The recess 8th has a support collar 17 around the groove, on which the end section 20 the closure part rests.

The dimensions of the closure part 12 and the shaped body 2 . 3 do not have to correspond to the conditions shown, but are largely freely definable, as long as the groove geometry is maintained for insertion of the flange.

so is a modular-like, cost-effective hot runner manifold or a hot runner manifold system created, the easy and fast to a variety of installation conditions is customizable and yet still no leaks in operation occur.

1

Manifold

2, 3

moldings

4

sprue bushing

5

connecting piece

6

jet

7

flanges

8th

recesses

9

T-groove shaped sections

10

transverse leg

11

longitudinal leg

12

closing part

13

lower Area

14

screw

15

threaded hole

16

drilling

17

support collar

18

pipe sections

18a

axial end regions

19

flow channel

20

end

X

insertion direction

Claims (10)

Hot runner manifold for use in injection molds containing at least two or more moldings ( 2 . 3 ) with flow channels ( 19 ) for a melt, wherein the flow channels ( 19 ) of at least two of the shaped bodies ( 2 . 3 ) are interconnected by tubular intermediate pieces, which at their axial ends with flanges ( 7 ) provided in recesses ( 8th ) engage the molded body, characterized in that the recesses T-shaped grooves ( 9 ), in which the flanges are radially insertable, and that the flanges in the recesses in each case by means of a closure part ( 12 ) are secured. Hot runner distributor ( 1 ) according to claim 1, characterized in that the intermediate pieces ( 5 ) middle pipe sections ( 18 ) and that the flanges ( 7 ) are formed as annular discs, which are integral with the pipe section ( 18 ) of the intermediate piece ( 5 ) are connected. Hot runner distributor ( 1 ) according to one of the preceding claims, characterized in that the closure part in its front in the direction of insertion (x) area ( 13 ) is T-shaped in such a way that it is in the T-groove sections ( 9 ) can be inserted. Hot runner distributor ( 1 ) according to one of the preceding claims, characterized in that the lower end in the insertion direction of the T-groove-shaped portion ( 9 ) is semicircular or semi-cylindrical. Hot runner distributor ( 1 ) according to one of the preceding claims, characterized in that the pipe section ( 18 ) in the mounting position facing area ( 13 ) of the T-shaped region is semicircular or semi-cylindrical, so that it is the intermediate piece ( 5 ) together with in this area also semicircular recess ( 8th ) completely encompasses. Hot runner distributor ( 1 ) according to one of the preceding claims, characterized in that the closure part on the molding ( 2 . 3 ) by means of a fastening device, preferably by means of screws ( 14 ), is attached. Hot runner distributor ( 1 ) according to one of the preceding claims, characterized in that the screws ( 14 ) the intermediate piece in turn in the insertion direction of holes ( 16 ) and into corresponding threaded holes ( 15 ) in the molded body ( 2 . 3 ) are screwed. Hot runner distributor ( 1 ) according to one of the preceding claims, characterized in that the closure part ( 12 ) in its end portion facing away from the intermediate piece in the mounting position ( 20 ) on a support collar ( 17 ) rests in the recess around the groove. Hot runner distributor ( 1 ) according to any one of the preceding claims, characterized in that the annular discs each by welding or soldering to the pipe sections ( 18 ) are attached or formed reshaping on this. Hot runner distributor ( 1 ) according to one of the preceding claims, characterized in that the flanges ( 7 ) is assigned in each case a seal.