Injection nozzle system for an injection molding machine
View Patent ↗A nozzle system is provided for an injection molding machine. The nozzle system includes a nozzle tip that is removably connected to a nozzle body with a sealing and mounting sleeve element. The nozzle body includes a first connector for releasably connecting with a second connector defined on the sleeve. The sleeve element further includes an alignment bearing for engaging a bearing surface defined on the nozzle body for precisely locating the nozzle tip within the nozzle body along on a predetermined axis. Further embodiments of the invention provide a valve pin disposed in the nozzle body and nozzle tip. The valve pin includes a bearing surface for engaging a guiding surface defined on the second melt channel for aligning the end of the valve pin with a mold gate. Further embodiments also provide an integrally connected nozzle tip and sleeve element.
1. A hot-runner nozzle comprising:
a nozzle body having a central melt bore;
a tip having a tip melt duct in communication with the central melt bore for delivering melt to a mold gate;
a seal member circumferentially surrounding at least a portion of the tip, the seal member having a seal portion for sealing against a cavity part; and
a connector member having a portion that circumferentially surrounds at least a portion of the tip and contacts the tip, the connector member having a thread mated to a thread of the nozzle body;
wherein the seal member is bonded to the connector member and the seal member is a metal material that is less thermally conductive than a material of the connector member.
2. The hot-runner nozzle of claim 1 , wherein the seal member and the connector member are bonded to each other at a planar interface.
3. The hot-runner nozzle of claim 1 , wherein the seal member is brazed to the connector member.
4. The hot-runner nozzle of claim 1 , wherein the tip is of a material that is more thermally conductive than the material of the seal member.
5. The hot-runner nozzle of claim 1 , wherein the material of the tip comprises tungsten carbide, beryllium copper, or copper alloy.
6. The hot-runner nozzle of claim 1 , wherein the material of the seal member comprises high speed steel, H13 stainless steel, or titanium.
7. The hot-runner nozzle of claim 1 , wherein the material of connector member comprises beryllium copper or copper alloy.
8. An injection molding apparatus, comprising:
a melt distribution manifold having a melt passage;
a heated nozzle having a central bore, the melt passage to convey heated melt to the central bore;
a tip having a tip melt duct;
a seal member; and
a connector member engaged to the nozzle and having a connector melt duct, the tip melt duct and the connector melt duct forming a melt duct through which heated melt from the central bore of the nozzle flows;
wherein the tip, the seal member, and the connector member are integrally joined.
9. The injection molding apparatus of claim 8 , wherein the tip, the seal member, and the connector member are integrally joined by brazing.
10. The injection molding apparatus of claim 8 , wherein the tip, the seal member, and the connector member are integrally joined by welding.
11. The injection molding apparatus of claim 8 , wherein the tip, the seal member, and the connector member are integrally joined by thermally bonding.
12. The injection molding apparatus of claim 8 , wherein the tip, the seal member, and the connector member are integrally joined by thermally expanding.
13. The injection molding apparatus of claim 8 , wherein the tip, the seal member, and the connector member are integrally joined by interference fitting.
14. The injection molding apparatus of claim 8 , wherein the connector member is threaded and adapted to engage a mating thread in the nozzle.
15. The injection molding apparatus of claim 8 , wherein the connector member is more thermally conductive than the seal member.
16. The injection molding apparatus of claim 8 , wherein seal member is made of H13 stainless steel, high speed steel, or titanium.
17. The injection molding apparatus of claim 8 , wherein connector member is made of beryllium copper or other alloys of copper.
18. The injection molding apparatus of claim 8 , wherein the tip is made of tungsten carbide, beryllium copper, or other copper alloys.
19. A hot-runner nozzle comprising:
a nozzle body having a melt bore;
a tip having a tip melt duct in communication with the melt bore for delivering melt to a mold gate; and
a sleeve assembly surrounding and contacting the tip, the sleeve assembly comprising a seal member and a connector member that are integrally joined;
wherein the seal member is a metal piece less thermally conductive than the connector member.
20. The hot-runner nozzle of claim 19 , wherein the seal member is a separate piece from the connector member.
21. The hot-runner nozzle of claim 19 , wherein the seal member is a bonded to the connector member.
22. The hot-runner nozzle of claim 19 , wherein the seal member is brazed to the connector member.
23. The hot-runner nozzle of claim 19 , wherein the seal member is made of H13 steel, stainless steel, or high speed steel.
24. The hot-runner nozzle of claim 19 , wherein the tip is wear resistant.
25. The hot-runner nozzle of claim 19 , wherein the tip is corrosion resistant.
26. The hot-runner nozzle of claim 19 , wherein the tip is made of tungsten carbide.
27. The hot-runner nozzle of claim 19 , wherein the tip is made of copper.
28. The hot-runner nozzle of claim 19 , wherein the tip is made of copper alloy.
29. The hot-runner nozzle of claim 19 , wherein the connector member is more thermally conductive than the tip.
30. The hot-runner nozzle of claim 19 , wherein the connector member is made of copper or copper alloy.
31. The hot-runner nozzle of claim 19 , wherein the tip and the connector member are made of copper.
32. The hot-runner nozzle of claim 19 , wherein the tip and the connector member are made of the same material.
33. A hot-runner nozzle, comprising:
a nozzle body having a melt bore;
a tip member having a tip melt duct; and
an assembly connecting the tip member to the nozzle body, the assembly comprising:
a first member contacting an end of the tip member, the first member having a first melt duct connecting the tip melt duct to the melt bore of the nozzle, the first member made of metal; and
a second member surrounding at least a portion of a cylindrical outer surface of the tip member, the second member made of metal;
wherein the first and second members are thermally bonded together.
34. The hot-runner nozzle of claim 33 , wherein the first and second members are brazed together.
35. The hot-runner nozzle of claim 33 , wherein the first and second members are welded together.
36. The hot-runner nozzle of claim 33 , wherein the assembly comprises a thread mated to a thread of the nozzle body.
37. The hot-runner nozzle of claim 33 , wherein the tip member is thermally bonded to the assembly.
38. The hot-runner nozzle of claim 33 , wherein the tip member comprises copper.
39. The hot-runner nozzle of claim 38 , wherein the assembly comprises a thread mated to a thread of the nozzle body.
40. The hot-runner nozzle of claim 33 , wherein the second member comprises a front seal portion.