CN101746017A

CN101746017A - Injection forming machine

Info

Publication number: CN101746017A
Application number: CN200910260499A
Authority: CN
Inventors: J·吉绍夫; G·皮尔韦恩; M·卡赫韦奇
Original assignee: Engel Austria GmbH
Current assignee: Engel Austria GmbH
Priority date: 2008-12-16
Filing date: 2009-12-15
Publication date: 2010-06-23
Also published as: AT507718B1; DE102009053517A1; AT507718A1

Abstract

An injection forming machine comprises a cavity composed by at least two components of a mould; plastic fusant can be added into the cavity; wherein, at least one of the at least two mould components have a metal forming surface (1) and a insulation region (2) directly disposed on the back of the forming surface (1); the insulation region insulates heat between the forming surface (1) and other parts of the mould component in the operation of the injection forming machine; and the injection forming machine has a heating device (3) by which, the forming surface (1) can be heated preferably from the side far from the insulation region (2). The machine is characterized in that: the insulation region (2) is a insulation layer separated from the metal form the metal forming surface (1).

Description

Injection moulding machine

The present invention relates to a kind of injection moulding machine, it comprises the cavity that at least two parts by a mould constitute, in this cavity, can add plastic melt, wherein, in these at least two mold components at least one has the molded surface of a metal and is connected on the insulating regions that molded surface is provided with later always, and this insulating regions makes the remainder thermal insulation of molded surface and mold component in the operation of injection moulding machine.

In order to revise flow behavior in other words in order to improve the surface characteristic of injection molding member targetedly, and dynamically (thermal change ground) carries out temperature adjustment to injecting molding die.Wherein, in each working cycles, the surface temperature with cavity before injection places uniform temperature, preferably is higher than glass and changes or crystalline melt temperature, and cooled off again after injection.

Known have many kinds of heating means:

Mitsubishi HEAVY IND LTD has introduced to circulate by means of liquid in JP 2005-225042 and has regulated the temperature of mould.This system comprises a liquid memory and the memory with the hot liquid that is used for heating mould with the cold liquid that is used for cooling die.

ONO SANGYO KK has introduced a kind of similar method in JP 2005-297386, be included in cavity surface neighbouring heating and cooling duct.The medium that is used to cool off with lower temperature is crossed these heating and cooling passages with the MEDIA FLOW with higher temperature.

In WO 2006/136743, Roctool adopts inducing method to come the heating mould surface.By setting up near the inserts the magnetic field heating cavity, and improve surface temperature in the mould with this.

The shortcoming of most of known methods is, because of having prolonged net cycle time heat time heating time.The high energy consumption of heating and cooling of being used to circulate also is another shortcoming.In order to reduce these influences, there was the people once to propose addition thereto in the past.At this, the quality of dynamic temperature-regulating is reduced (for example application of ENGEL " Abhebender Einsatz (outstanding inserts) ").And in WO2007/034815, then be that a heat insulation layer is set in the back of heating/cooling duct, so that keep the surface of as far as possible little to be heated/cooling.

Disclosed a kind of method in DE 10 2,006 013 368 A1 (KI L ü denscheid), it does not have heating, and only can partly reach the effect of thermal change temperature adjustment by the heat of the plastic melt that adds.This point reaches by the application of ceramic die inserts or by the mould cavity that is coated with ceramic layer.Pottery constitutes an insulator here, borrow its in short time so degree ground improve the temperature that contacts between plastic melt and mold wall, the coating that makes the moulding on surface improve and realize joint close.

But the pottery on the die surface has such shortcoming, that is, it can not be with the such same degree polishing of metal.Can not improve the contact temperature arbitrarily in addition, this temperature is drawn by following formula:

T_{K} = \frac{T_{M} \times b_{M} + T_{W} \times b_{W}}{b_{M} + b_{W}}

T _K[℃] the contact temperature

T _M[℃] melt temperature

T _W[℃] contact mold wall temperature before

The diathermanous coefficient of melt

The diathermanous coefficient of mould

For the same high situation of the diathermanous coefficient of the diathermanous coefficient of pottery and melt, the contact temperature of harmonizing, this contact temperature is equivalent to the mean value of melt temperature and mold temperature.Example: melt temperature=250 ℃, 165 ℃ of mold temperature=80 ℃ → contact temperature.If definite, in order to reach desirable effect, this contact temperature is not enough, then must improve mold temperature.But therefore simultaneously also prolonged cool time, uneconomical thereby processing procedure becomes.Change a kind of expression way, the meaning is exactly: desired contact temperature is determined cool time by mold temperature.

By US 5,468,141 can learn the injection moulding machine of this type, and here just the heat of the melt by adding cavity is realized heating to shape layer.

The feature of claim 1 preamble is disclosed among the US 2004/0222566A1.

The objective of the invention is, improve the injection moulding machine of this type, make it in the variations in temperature of molded surface, reach bigger flexibility (flexibility).

Above-mentioned purpose is achieved by a kind of injection moulding machine with claim 1 feature.

Other advantageous forms of implementation of the present invention is illustrated in each dependent claims and can describes by accompanying drawing and its corresponding diagrammatic sketch and draw.

Fig. 1 to 3 illustrates one embodiment of the present of invention separately.Fig. 4 illustrates the total figure according to injection moulding machine of the present invention.

Embodiment 1(Fig. 1 a, 1b):

Surface common formation one cavity that 1 and one on the metal forming surface that is provided with in the mold component of being studied is provided with in another (unshowned) mold component, this metal forming surface is provided with an insulating barrier as insulating regions 2: the zone that has a metal in the back again, known cooling hole 6 itself is set in this zone, and their available a kind of media dash and drench.The thickness of insulating barrier typically is in the scope of a few tenths of millimeter, preferably in the scope of 0.1-0.5mm.

The metal level on surface 1 is thin more, and then the maximum of surface temperature is high more.The thickness of insulating barrier determines finally how temperature descends soon again.Can satisfy known requirement (but but for example polishability structure voltinism, wearability etc.) by metallic surface 1 to cavity surface.Surface 1 heating of being undertaken by heater 3 is shown among Fig. 1 b.

Advantage with respect to prior art is:

-by the heating of metal surface, can improve the temperature of control contact pointedly in other words,

-metal level here can have and reaches several millimeters thickness.By the increase of thickness, can consider to use different manufacture methods,

-quality to be heated is very little, so heat time heating time is short, and the energy requirement of heating and cooling is also less,

-because quality to be heated is very little and because insulating regions 2 is arranged, thus the thermal source of gross area effect needn't be set, also can be with heater 3 with the thermal source of wire or point-like mobile (for example utilizing manipulator) from the teeth outwards.

Embodiment 2(Fig. 2):

In embodiment, adopted the inserts of sintering metal by Fig. 2.This porous materials is in the back of metal surface 1.

Perhaps, also can utilize regenerative preparation to make complete inserts (Laser for example

), wherein set near the cavity of above-mentioned profile as insulating regions 2.

Lasercusing can realize hierarchically constructing member by resembling well whole welding materials (for example high-quality steel, Thermal-resistance tool steel and quenched and tempered steel).This point melts by the dusty material that makes one pack system by means of laser and realizes.At this, powder is melted layer by layer fully.The typical thickness of powder bed is between the 20 and 50 μ m.

Another possibility is a foaming aluminium, and it has skin (molded surface 1) and an internal layer that works as insulating regions 2 of a densification.

Embodiment 3(Fig. 3):

In pressing the embodiment of Fig. 3, apply an additional insulating barrier 7 in the back in temperature adjustment hole 5, it makes quality to be heated keep as far as possible little.Insulating regions 2 here constitutes jointly by each temperature adjustment hole 5 and insulating barrier 7.

Fig. 4 illustrate a mould not shown further according to the setting in the closed cell of injection moulding machine of the present invention.Closed cell has a fixing mold cramping plate 8 and a movable mold cramping plate 9 in known manner.By unshowned injection device, in the cavity that plastics are expelled in mould to be constituted.

Be suitable for as follows in the embodiments of figure 3:

Can fill with cavity with (for example air) or liquid (for example water) dielectric of gaseous state.In this case, cavity advantageously is connected with outlet with the inlet port that is used for dielectric.Perhaps also cavity can be evacuated.

As heater 3, can consider whole known devices for example IR (infrared ray) radiator, Halogen lamp LED, induction heating apparatus etc.When using the IR heater, can additionally on molded surface 1, adopt the coating of an absorbing IR.

Heater 3 definitely is provided with position and not really important on injection moulding machine.For example, heater 3 (being different from diagram) can be the part of mould.It also can for example be arranged on (unshowned equally) manipulator.Heater 3 for example also can be integrated in the metal level, and the molded surface 1 of metal is made of this metal level.

Claims

1. injection moulding machine, it comprises the cavity that at least two parts by a mould constitute, in this cavity, can add plastic melt, wherein, in these at least two mold components at least one has the molded surface (1) of a metal and is connected on the insulating regions (2) that described molded surface (1) is provided with later always, this insulating regions makes the remainder thermal insulation of molded surface (1) and mold component in the operation of injection moulding machine, and, described injection moulding machine has a heater (3), by it, preferably can heat described molded surface (1) from a side away from insulating regions (2); It is characterized in that described insulating regions (2) is designed to an insulating barrier with molded surface (1) separate construction of metal.

2. according to the described injection moulding machine of claim 1, it is characterized in that described heater (3) can be inserted in the mould of opening, to heat described molded surface (1).

3. according to claim 1 or 2 described injection moulding machines, it is characterized in that the surface of the heating of described heater (3) is less than described molded surface (1).

4. according to one of claim 1 to 3 described injection moulding machine, it is characterized in that, be provided with one and be used to device that heater (3) is moved back and forth.

5. according to one of claim 1 to 4 described injection moulding machine, it is characterized in that described insulating barrier has the thickness of a few tenths of millimeter, is preferably 0.1 to 0.5mm.

6. according to one of claim 1 to 5 described injection moulding machine, it is characterized in that described insulating barrier is made of agglomerated material or foaming aluminium.

7. according to one of claim 1 to 6 described injection moulding machine, it is characterized in that the molded surface of metal (1) is coated on the insulating regions (2) as coating.