HK1092109B - Injection molding nozzle - Google Patents

Description

Die casting nozzle

Technical Field

The invention relates to a die casting nozzle for use in a die casting mold according to the preamble of claim 1.

Background

For the purpose of supplying flowable materials, in particular melts, to a mold assembly (mold part), injection molding nozzles, in particular hot or cold channel nozzles, are generally used. These nozzles usually have a thermostatic nozzle body, in which a flow channel or melt channel is formed, which leads to the upper or inner side of the nozzle head and is in flow connection with a die cavity of a die casting die formed by a die part. In order to maintain the melt at a uniform temperature up to the vicinity of the die part, a nozzle head fixedly installed into the nozzle body from below is composed of a highly heat conductive material. An air gap is formed between the die casting nozzle and the die for thermal separation.

A disadvantage in this respect is that the wear of the spray head is relatively high, in particular in the case of processing of materials filled with abrasive grain components. The spray head must therefore be replaced regularly, which in the case of conventional spray nozzles is time-consuming.

The same problem exists with needle-like closed nozzles. These nozzles usually have pneumatically or hydraulically actuated closing needles which are periodically moved from an open position into a closed position. In order to avoid damage to the nozzle head and the mold in this case, as precise a needle guidance as possible is required.

For example, DE-C2-3245571 proposes that the closure needle be formed in multiple stages at the lower end, with a diametrically enlarged connecting edge in front of the actual closure of the needle. The nozzle forms a predetermined core with an insertion funnel which interacts with the connecting edge of the closure needle during the closing process in such a way that the front sealing edge of the preferably cylindrical closure is always inserted into the nozzle without contact.

In order to further reduce the wear of the pre-centering body fixedly installed in the nozzle body, the pre-centering body is made of a high-strength material. However, the spray head must also be replaced regularly, which entails corresponding costs. For this purpose, unfavorable heat distributions are formed in the region of the casting opening and the sealing seat. Both are furthermore located in the mould part. If they have to be replaced because of wear, only the cost expenditure is increased.

DE-a 1-3124958 (US-PS-4,286,941) avoids this by providing a nozzle seal with a conical end face between the die part and the nozzle body. The piece is distributed through an insulated air gap into a correspondingly shaped opening in the mould part. The inner bore of the nozzle seal is likewise conical. The bore receives the tapered end of the valve needle in its closed position when the pouring opening is formed. A nozzle seal member fixedly upstanding within the nozzle body is formed of a low thermal conductivity material and forms a portion of the wall of the mold cavity.

Thus, although a thermal separation between the externally heated nozzle body of the needle-like closed nozzle and the cold mold is achieved, the highly thermally conductive spray head cannot distribute the temperature evenly over the mold parts. The replacement of the nozzle seal can only be carried out at considerable expense and with a considerable investment in the mould. A further disadvantage is that the nozzle seal in the die part has no reusable support, so that deviations can occur due to different thermal expansions between the end face of the nozzle seal and the die cavity wall, which adversely affect the production result.

EP-a 1-0638407 discloses a die-cast nozzle with a nozzle body, in which a highly thermally conductive spray head is fixedly mounted on the inner end face of the nozzle body for improved heat distribution. The latter receives a centering sleeve of hardened steel on its end face, which engages with its free end into the shoulder of the die part. The centering sleeve serves for centering the closing needle, which closes a cylinder section, which is very short in the casting opening formed in the mold part, with a cylindrical closure part. The centering sleeve likewise contacts the die part only at a minimum depth in order to keep the heat transfer from the hot channel nozzle to the die part to a small extent.

A disadvantage in this respect is that both the spray head and the centering sleeve are fixedly mounted in the nozzle body, which prevents rapid replacement of the wear part. Furthermore, the extremely tight fit in the die parts causes a number of problems during assembly, in particular the expansion joints between the centering sleeve and the shoulder in the die cavity must be retained in order to compensate for the thermal expansion of the nozzle body. If the centering sleeve cannot be accurately controlled by its extremely tight fit in the die cavity, damage can occur during heating of the hot channel nozzle, particularly in the case of a warped centering sleeve. Another disadvantage is that the centering sleeve cannot be located all the way close to the mould cavity, i.e. the sealing seat is in the mould part. Since the closing pin can only close the very short cylindrical part of the casting bore, leaktightness can rapidly occur, in particular due to the thermal expansion which is difficult to control.

Disclosure of Invention

The main object of the present invention is to overcome these and other drawbacks of the prior art and to provide a die casting nozzle for use in a die casting mold, which nozzle can be manufactured in a simple manner and at low cost and which is also simple and quick to replace the nozzle head and/or the components present therein. While at the same time the adverse effects of the temperature distribution and the effects of thermal expansion are eliminated as far as possible. In addition, in the case of a die-cast nozzle in the form of a needle-shaped closing nozzle, a continuously precise needle guidance and needle sealing is achieved, which ensures a consistently reliable operation even under high alternating loads.

The essential features of the invention are specified in claim 1. Various forms of subject matter of claims 2-27.

In a die-casting nozzle for use in a die-casting die, which has a nozzle body, in which at least one flow channel for a die-casting compound to be processed is formed, which channel leads to the upper or inner side of a nozzle head and is connected in a flow manner to a die cavity of the die-casting die, which die cavity is formed by at least one die part, by means of a part which is provided at the upper or inner end side of the nozzle head, it is proposed that the nozzle head arranged in the nozzle body and/or the part arranged in the nozzle head are formed so as to be displaceable in the longitudinal direction and are clamped between the nozzle body and the die part during operation of the die-.

The spray head and/or the components mounted therein can be readily and conveniently removed by longitudinal movement of the fitting. No tools or other aids are required. However, the nozzle head or the part is still reliably secured firmly, i.e. clamped between the nozzle and the mould part, during operation of the die-cast nozzle. No additional measures or aids for fixing the spray head or the component are required. The die casting nozzle can be used repeatedly.

Another major advantage is that the change-over time for changing the nozzle and/or the inner longitudinal movement of the guide element is minimized, which has a favorable effect on the mould costs. The same applies to maintenance.

Furthermore, it is advantageous that the components can be replaced quickly and easily at any time by other arrangements or embodiments, for example, instead of a hold-down nozzle with an open casting gate or nozzle tip, a needle-like closing nozzle or a change in the diameter of the casting point.

The die-casting nozzle according to the invention can be a hot channel nozzle or a cold channel nozzle.

The flange formed on the component forms a reliable contact surface for the component, both on the spray head and on the die component. A good thermal separation between the die-casting nozzle and the mould is thus achieved. But on the other hand the components are not completely cooled, thereby reducing the risk of cold blockages forming inside the flow channels. While a highly heat-conductive spray head facilitates an optimal temperature distribution up to the mould parts.

Furthermore, the flanges of the parts form a specific reference surface, so that the position of the parts and the distance between the nozzle head and the mould part can be adjusted very precisely. The component itself centers the nozzle body relative to the die component, wherein the casting nozzle is preferably formed in the component. The part also forms part of the mould cavity wall so that there are few visible casting points.

Drawings

Further features, details and advantages of the invention emerge from the content of the claims and the following description of an embodiment with the aid of the drawings. Wherein:

fig. 1 shows a side view in partial section of a die-cast nozzle in the form of a needle-like closed nozzle;

FIG. 2 shows an enlarged partial view of the needle-like closed nozzle of FIG. 1;

FIGS. 3a-3c show the needle of the needle-like closed nozzle of FIG. 1 in various positions;

FIG. 4 shows an enlarged view in partial cross-section of the bottom of another embodiment of a needle-like closed nozzle;

FIG. 5 shows a similar attempt to that of FIG. 4, but with a different structure;

FIG. 6 illustrates a die cast nozzle with an open casting gate;

FIG. 7 shows a different configuration of the die cast nozzle of FIG. 6;

FIG. 8 shows a die cast nozzle together with a nozzle front end; and

fig. 9 shows a different configuration of the nozzle of fig. 8.

Detailed Description

Fig. 1 is a die casting nozzle, designated as a whole by 10, which is embodied as a needle-like closed nozzle and is a component of a die casting mold (not shown). It has a preferably externally heated nozzle body 20 in the housing 11, which forms a flow channel 30 concentrically to the longitudinal axis L. A melt to be processed, for example a metal, silicon or plastic melt, is supplied from the material supply opening 17 via the flow channel 30 to the die cavity (not shown in detail). The latter is formed between mould parts 12, 13 fixed to a (not shown) mould plate.

A nozzle tip 40 made of a highly heat-conductive material, which continues the melt channel 30 downwards, is preferably screwed into the nozzle body 20. The nozzle head 40, the nozzle body 20, the housing 11 and the die member 12 delimit an air gap 15 which thermally separates the needle-like closed nozzle 10 and the die member 12 from each other. The housing 11 of the recessed needle-like closed nozzle 10 is received by the mould part 12 above the air gap 15, wherein the contact surface (not shown) may constitute a pre-centering means 19.

Axially displaceable between the nozzle head 40 and the die part 12, a part 50 made of a wear-resistant material is provided, which centers the needle-like closed nozzle 10 relative to the die part 12 and, like the air gap 15, effects a thermal separation between the nozzle head 40 and the die part 12, i.e. the flowable melt is kept at a constant high temperature by the highly thermally conductive nozzle head 40 in the immediate vicinity of the die cavity. The centering body 50 simultaneously protects the cooled die section 12 from heat.

Fig. 2 shows the portion I of fig. 1 enlarged. It can be seen that the centering body 50 is formed overall rotationally symmetrically to the longitudinal axis L. It has a flange 52 and a cylindrical narrow neck section 53. The centering body is inserted from below into the melt channel 30 or the nozzle 40 and guided therein in a longitudinally displaceable manner.

At its end adjacent to the die cavity, the centering body 50 has a likewise cylindrical end piece 56, which forms the pouring opening 18 coaxially with the longitudinal axis L and is likewise inserted longitudinally displaceably in a cylindrical seat 86. This centering seat 86 formed by the die part 12 is coaxial with the casting opening 18 and is stepped and/or tapered in the upper section, so that the centering body 50 is always accommodated without problems in the seat 86 during assembly by means of its end piece 56 and the needle-like closed nozzle 10 is also always centered reliably during assembly.

The outer diameter of the end piece 56 is a close form fit with the mould part 12 so that the melt does not enter the air gap 15. The centering body 50 can be moved longitudinally within the seat 86 so as to simultaneously compensate for thermally induced changes in the length of the needle-like closed nozzle 10, if desired. The same applies to the neck section 53. Its outer diameter is also closely form-fitted to the inner diameter of the spray head 40 in order to ensure longitudinal mobility on the one hand and to form a sealing connection on the other hand.

The end piece 56 delimits a part of the mould cavity by an end face 58, for example, embodied as a flat face, wherein the end face 58 and the (not shown) mould cavity wall are arranged essentially flush, so that the casting point is not visible above the product to be produced.

The flow channel 30 of the needle-like closed nozzle 10 continues through the centering body 50. The flow channel forms a channel 59 ending in the casting nozzle 18, so that the melt can always flow into the mold cavity without hindrance due to the concentric orientation of the hot channel nozzle 10.

For opening and closing the casting nozzle 18, an axially displaceable closing needle 60 is provided, which is longitudinally displaceable through the melt channel 30 and the nozzle head 40 and can be moved from an open position into a closed position by means of a pneumatic drive (not shown). At the end of the closing needle 60, which is formed at least in sections as a cylinder and is formed in multiple steps in diameter along the longitudinal axis L, a closing element 65 is provided, which in the closed position engages through the end piece 56 of the centering body 50 into the casting opening 18, which at the same time forms a cylinder seal D of the closing needle 60.

The transition from the diametrically larger needle portion to the diametrically smaller portion can be tapered or rounded, wherein a connecting edge 64 is formed between the needle portion 62 and the closure element 65 connected thereto, the diameter of which is greater than the diameter of the end-side sealing edge 66 of the closure element 65 of the closure needle 60.

The connecting edge 64 serves to center the closing needle 60, offset from its concentric position in the melt channel 30, with the centering body 50, so that the sensitive closing needle 65 is not damaged and the pouring opening 18 is always closed in a pressure-tight manner. For this purpose, a first entry cone 54 is provided in the neck section 53 of the centering body 50, which merges concentrically with the longitudinal axis L into a cylindrical guide section 55, the inner diameter of which is slightly larger than the outer diameter of the needle section 62 of the closure needle 60. A second cone 57 formed in the centering body 50 in front of the casting opening 18 reduces the inner diameter of the guide section 55 to the diameter of the closure pin 60 and the closure 65.

Needle-like closed nozzle 10 is operated to deliver flowable material through material delivery port 17. Material enters the mold cavity through the flow channel 30, the spray head 40, the channel 59, and the casting gate 18. For example, the displacement gap 88 between the nozzle body 40 and the component 50 is dimensioned such that the nozzle body 20 and the nozzle body 40 can expand unhindered until the operating temperature is reached. If the operating temperature is reached, the component 50 is clamped by means of the nozzle 40 between the nozzle body 20 and the mold part 12, wherein the bottom surface of the flange 52 formed by the visible widening of the component 50 forms the lower contact surface 51, which is in planar contact with the step 14 of the mold part. The height of the end piece 56 (not shown) of the component 50 is dimensioned such that the mold limit simultaneously formed by the end face 58 is always flush. The surface of the flange 52 limiting the gap 88 is shaped to bear reasonably against the lower end face of the nozzle 40, so that the flange 52 always remains in a secure position.

As fig. 3a to 3c show, if the closure needle 60 is moved from the open position into its closed position, it is automatically aligned concentrically to the longitudinal axis L by the connecting edge 64 and the first entry cone 54, the needle section 62 being guided in a positionally stable manner in the guide section 55 of the centering body 50 until the closing element 65 enters the sealing seat D (fig. 3 c.) the sensitive sealing edge 66 of the closure needle 60 is simultaneously in contact with both the nozzle head 40 and the centering body 50, since the length x + y from the connecting edge 64 to the sealing edge 66 is smaller than the length b + c of the guide section 55 and the second cone 57. The contact of the connecting edge 64 with the inlet cone 54 is without problems, since the preferably slightly rounded connecting edge 66 of the closing needle 60 has no sealing effect and the centering body 50 is preferably composed of a wear-resistant material.

In order not to generate undesirable back pressure inside the melt during the closing process of the closing needle 60, the inlet cone 54 in the centering body 50 can have ribs (not shown in detail), axial webs or the like, which concentrically and slidably surround the closing needle 60. Additionally or alternatively, as shown in fig. 2, the shut-off needle 60 can have a projection or depression 68 on the inside in the region of the needle section 62, so that the melt discharged from the shut-off needle 60 can flow back into the melt channel 30 without obstruction. The recess 68 is substantially V-shaped in the embodiment of fig. 2.

As shown in fig. 3c, the closing pin 60 can also be closed flush with the component 50 by means of its closing section 65 or its end face (not shown in detail), so that an almost invisible casting point is produced on the injection-molded part. The closure may also have embossments if desired.

If, for example, the component 50 has to be replaced for the reason of achieving maximum durability, the flow of liquid plastic through the material feed opening 17 is first interrupted. The needle-like closed nozzle 10 is then either removed from the mould or the mould parts 12, 13 are removed. As long as the component 50 is free of fluid flow, it need only be pulled from the spray head 40 and replaced with a new component 50. No tools are required for this. Rather, the component 50 can be quickly and easily removed and replaced as quickly and easily. The time and operation taken for replacement is greatly reduced.

The diameter of the sealing seat D can likewise be varied simply by means of the part 50, for example if other closure needles 60 or other casting openings 18 are used. Since the sealing seat D is formed in the component 50, the closing needle 60 can always reliably close the nozzle 10. The length change of the nozzle 10 due to heat has no effect on the sealing.

In the exemplary embodiment of fig. 4, the injection molding nozzle 10 is likewise embodied as a needle-like closed nozzle. It has an axially displaceable closure needle 60 with a larger diameter upper section 62 which tapers to a closure member 65 at a tapered or rounded transition 63.

The moving part 50, which constitutes both the closing needle 60 and the centring body of the nozzle 10, projects into the lower end of the spray head 40. For this purpose, the centering body 50 has an upper neck section 53 which can be moved axially into the spray head 40 and a first inlet cone 54 which interacts with a connecting edge 64 of the closure needle 60. The end piece 56 engages in a centering seat 86 of the mould part 12 and has a further taper 57 for closing the needle 60.

Between the neck section 53 and the end piece 56, the part 50 has a bearing flange 52, which bears with an axially formed annular circumferential rib 82 on the step 14 of the die part 12. While the upper surface of the movement limiting gap 88 is formed smoothly by the flange 52. This upper plane is in contact with the spray head 40 if the needle-like closed nozzle 10 has reached its operating temperature.

The flange 52 is connected coaxially to the longitudinal axis L to a cylindrical end piece 56, which forms the pouring opening 18 and a sealing seat D therein for closing the needle 60. The end piece 56 also has a guide section 55 and a second cone 57 formed therein. Fig. 4 shows that the closure needle 60 is moved from the open position into its closed position, wherein the closure element 65 is positively inserted into the sealing seat D and thus closes the pouring opening 18. The closure part 65 projects with its sealing edge 66 partly into the mould cavity.

In the embodiment of fig. 4, the spray head 40 and the member 50 are separately formed, wherein the spray head 40 fixedly mounted in the nozzle body 20 is composed of a highly heat conductive material, and the longitudinally moving member 50 is composed of a high strength material.

Whereas according to the construction of the die-cast nozzle 10 shown in fig. 5, the head 40 and the part 50 are integrally and both made of a highly heat conductive material. The nozzle pieces 40, 50 are inserted into the nozzle body 20 from below in a longitudinally displaceable manner, wherein the piece 50 rests with its circumferential rib 82 formed on the collar 52 on the step 14 of the die part 12. The nozzle head 40 has a stopper 22 inside the nozzle body 20, for example, in a conical convex manner.

As can be seen in fig. 5, the circumferential rib 82 formed on the flange forms a relatively small contact surface and the wall thickness of the end piece 56 longitudinally displaceably embedded in the seat 86 is reduced. By these measures the heat transfer from the well heat conducting nozzle piece 40, 50 to the mould part 12 is kept to a minimum. Since the end piece 56 of the part 50 is in direct contact with the die part 12, although the temperature of this end piece is almost absorbed, the heat losses are kept relatively small by the small wall thickness in the end piece 56 and by the air gap 87 additionally formed between the end piece 56 and the die part 12. The smaller wall thickness in the end piece 56 is achieved for this purpose by a step 81 formed on the outer circumference, i.e. by a reduction in the outer diameter. However, the inner bore 59 can also be designed in a stepped or tapered manner. Advantageously, the step 81 is located within the preferably annular air gap 87, so that a relatively steep temperature gradient can be formed there.

Another important advantage of this embodiment is that the flow channel 30 is kept at an optimum temperature through the nozzle pieces 40, 50 almost up to the casting opening 18. As a result, no so-called cold blockages are formed in front of the casting nozzle 18, which has a favorable effect on the production result. At the same time, the nozzle pieces 40, 50 can be replaced quickly and easily at any time, either when they are closed or when their geometry changes, by simply pulling them out of the nozzle body 20 and inserting a new part.

As further shown in fig. 5, the nozzle members 40, 50 may also be inlet cones 54 enclosing the needles 60. It transitions in the region of the end piece 56 of the component 50 into a guide section 55 which ends on a second cone 57. The cone opens directly into the casting opening 18.

Fig. 6 shows a die-cast nozzle 10 without a closing pin 60 with an open casting gate 90, which gate end side is formed by the end piece 56 of the component 50. This part is also formed integrally with the nozzle head 40 and is inserted into the nozzle body 20 from below by means of its longitudinal displacement. The flange 52 of the component 50 is in this case in contact with its planar contact surface 51 on a cylindrical support sleeve 70 made of a low-thermal-conductivity material. Which is formed concentrically with the longitudinal axis L and is longitudinally movably inserted into a seat 86 of the die section 12.

The end piece 56 of the part 50 tapers on its outer circumference in order to be able to seal against the casting opening 18, which is likewise conically formed. In this way, direct contact between the melt to be processed and the die part 12 is reduced. An air gap 92 is formed between the nozzle piece 40, 50 and the bearing sleeve 70 of the die part 12 for thermal separation between the die-casting nozzle 10 and the dies 12, 13.

Fig. 7 shows a modified structure. The support sleeve 70, which is arranged in the base 86 so as to be longitudinally displaceable, forms the casting opening 18 and also a part of the wall of the mold cavity. Coaxially to the longitudinal axis L, it has a flange 72, which is supported on the step 14 of the die part 12 by an axially formed circumferential rib 73. Furthermore, a further support ring 74 is provided between the nozzle body 20 and the support sleeve 70, which ring rib 75 opens radially into the die part 72 and, when the operating temperature is reached, bears on the support sleeve 70 with an axial rib 76.

The longitudinally displaceable nozzle part 40, 50 inserted into the nozzle body 20 and the longitudinally displaceable support sleeve 70 introduced into the die part 12 also form a plug-in system which always ensures optimum length compensation and can be replaced or exchanged at any time without the use of tools by simply pulling the part 40, 50, 70 out of its holder and inserting a new part. The nozzle members 40, 50, the support sleeve 70 and the support ring 74 are clamped between the nozzle body 20 and the die block 12 during operation, so that all components are securely fixed. No special or additional fixing elements are required.

In the exemplary embodiment of fig. 8, the component 50 or the integral nozzle piece 40, 50 has on its end side an integrally conical nozzle nose 94 with, for example, three circumferentially distributed outlet openings 95. Which connects the melt channel 30 to the casting opening 18 formed by the die section 12. The part 50, which is inserted into the nozzle body 20 and is moved longitudinally together with the nozzle head 40, is also supported by its flange 52 on a low-thermal-conductivity support sleeve 70, which limits the air gap 92 against the nozzle front 94 and the die part. This air gap is advantageous to improve the thermal separation between the nozzle 10 and the dies 12, 13.

The structure of fig. 9 is generally similar to that of fig. 7, except that the member 50 or nozzle members 40, 50 have a geometry corresponding to that of fig. 8. The cone nose 94 passes through the casting opening 18, which is likewise conical, and thus through the interface 16. The casting nozzle 18 is formed by a support sleeve 70.

The invention is not limited to the embodiments described above but may be varied in many ways. For example, a torsion-proof connection is provided between the nozzle head 40 and the nozzle body 20, between the part 50 and the nozzle head 40 and/or between the part 50 and the die part 12 in order to orient the parts in a preferred direction. The part 50 formed by the nozzle tip 94 can also be formed by side (multiple) injection molding.

The sealing seat D of the closing needle 60 in the part 50 need not necessarily be of cylindrical configuration. It may also be conical, for example, in order to be able to receive a similarly conical closure needle 60 in the end region 65. The cylindrical guide section 55 can be omitted in this case, since the channel 59 is formed in its entirety conically. However, it is important that the sealing seat D and also the casting opening 18 are also arranged in the component 50 or its end piece 56 in order to make it sensitive to the material to be processed, but the mold region, which is important for the product quality, can be replaced quickly and easily at any time.

In order to increase the durability of the injection-molded nozzle 10, the nozzle head 40, which is formed integrally with the part 50, can if desired also be made of a highly thermally conductive, but at the same time wear-resistant material.

It can be seen that the invention has a nozzle 10, which is usually used in injection molding technology, and which has at least one flow channel 30 for the injection molding compound to be processed in the nozzle body 20. The passage 30 is connected at the lower end via the nozzle 40 and the part 50 in a flow connection with a die cavity of a die casting die formed by at least one die part 12, 13. Member 50 is constrained within spray head 40 against longitudinal movement within the lower end of flow passage 30. This part also constitutes the casting gate 18. In a needle-like closing nozzle 10, a closing needle 60, which is movable between an open position and a closed position, passes through the melt channel 30 and the component 50, which overall forms a centering body, wherein, for example, the inlet cone 54 centers the inherent closing element 65 of the needle 60. The nozzle 40, which is made of a highly heat-conductive material and surrounds the upper part 53 of the part 50, can be screwed or longitudinally moved from below into the nozzle body 20. Alternatively, the nozzle tip 40 and the member 50 may be integrally formed and longitudinally movable together to be received in the nozzle body 20. In order to find a fixed support for the spray head 40 and/or the component 50, the component or the centering body 50 has a support flange 52.

All features and advantages, including structural details and spatial arrangements, which are described in the claims, the description and the drawings, are essential to the invention both by themselves and in various combinations.

Reference numerals

D sealing seat

L longitudinal axis

10 die casting nozzle

11 outer cover

12 mould/pattern part

13 mould/die assembly

14 steps

15 air gap

16 interface

17 material delivery port

18 pouring gate

19 predetermined heart device

20 nozzle body

22 stop dog

30 flow channel/melt channel

40 spray head

50 parts/centring body

51 contact surface

52 Flange

53 neck segment

54 first entry cone

55 guide section

56 end piece

57 second cone

58 end face

59 channel

60 closed needle

62 needle section

63 transition region

64 connecting edge

65 closure

66 sealing edge

68 recess/depression

70 support sleeve

72 flanged edge

73 circumferential rib

74 supporting ring

75 annular Rib

76 axial rib

82 circumferential rib

86 seats

87 air gap

88 moving gap

90 open casting gate

92 air gap

94 nozzle front end

95 outlet hole

Claims (19)

1. A die-casting nozzle (10) for use in a die-casting die, having a nozzle body (20) in which at least one flow channel (30) for a die-casting compound to be processed is formed, which channel opens onto or into a die head (40) and is in flow connection with a die cavity of the die-casting die, which is formed by at least one die part (12, 13), via a part (50) which is provided on the upper or inner end side of the die head (40), wherein the die head (40) which is arranged in the nozzle body (20) is displaced in the longitudinal direction and is clamped between the nozzle body (20) and the die part (12, 13) during operation of the die-casting nozzle, wherein the die head (40) and the part (50) are produced in one piece, and wherein a bearing sleeve (70) is arranged between the part (50) and the die part (12, 13),

the method is characterized in that:

the support sleeve (70) forms and limits a part of the casting opening (18) and the cavity of the mould respectively,

the support ring (74) is arranged between the nozzle body (20) and the support sleeve (70), and

the support ring (74) is inserted radially into the mould parts (12, 13) via an annular rib (75).

2. Die-cast nozzle (10) as claimed in claim 1, wherein the bearing sleeve (70) is arranged in a longitudinally displaceable manner in a base (86) of the mould parts (12, 13).

3. Die-cast nozzle (10) according to claim 1 or 2, wherein the component (50) has a flange (52) which is axially supported on the bearing bush (70), wherein a planar contact surface (51) is formed between the flange (52) and the bearing bush (70).

4. Die-cast nozzle (10) according to claim 1 or 2, wherein the bearing sleeve (70) comprises a flange (72) which is supported with an axial circumferential rib (73) on the step (14) of the mould parts (12, 13).

5. Die-cast nozzle (10) as claimed in claim 1 or 2, wherein the support sleeve (70) is longitudinally displaceable and clamped between said part (50) and the mould parts (12, 13) during operation of the nozzle (10).

6. Die-cast nozzle (10) as claimed in claim 1 or 2, wherein the bearing ring (74) is supported on the bearing sleeve (70) with axial ribs (76) when the operating temperature is reached.

7. Die cast nozzle (10) as claimed in claim 1 or 2, wherein the spray head (40) has a stop (22) in the nozzle body (20).

8. Die-cast nozzle (10) as claimed in claim 1 or 2, wherein the spray head (40) and the part (50) form a longitudinally displaceable nozzle part (40, 50).

9. The die-cast nozzle (10) as claimed in claim 8, wherein the longitudinally displaceable nozzle part (40, 50) and the bearing sleeve (70) form a plug-in system, the nozzle part (40, 50) being inserted into the nozzle body (20), and the bearing sleeve (70) being introduced into the die part (12) so as to be longitudinally displaceable.

10. Die-cast nozzle (10) as claimed in claim 1 or 2, wherein the end piece (56) of the component (50) has or forms the casting opening (18).

11. Die-cast nozzle (10) according to claim 1 or 2, wherein the component (50) forms a centering body of the die-cast nozzle (10).

12. A die cast nozzle (10) as claimed in claim 1 or 2, wherein the spray head (40) is made of a highly thermally conductive material.

13. A die-cast nozzle (10) as claimed in claim 1 or 2, wherein the part (50) is made of a highly heat-conductive material.

14. Die-cast nozzle (10) as claimed in claim 1 or 2, wherein the spray head (40) and the component (50) are made of the same material.

15. A die-cast nozzle (10) as claimed in claim 1 or 2, wherein the part (50) is made of a wear-resistant material.

16. The die cast nozzle (10) as claimed in claim 1 or 2, wherein the nozzle head (40) and the component (50) form an open casting gate (90).

17. Die cast nozzle (10) as claimed in claim 1 or 2, wherein the spray head (40) and the component (50) form or have a conical nozzle nose (94), the conical nozzle nose (94) being adjacent to the interface surface (16) or protruding from the interface surface (16).

18. Die-cast nozzle (10) as claimed in claim 1 or 2, wherein the bearing sleeve (70) delimits the air gap (92).

19. Die-cast nozzle (10) according to claim 1 or 2, wherein the die-cast nozzle (10) is a hot channel nozzle or a cold channel nozzle.