Hot runner system, hot nozzle assembly and nozzle core structure

Abstract

The utility model provides a hot runner system, a hot nozzle assembly and a nozzle core structure, the nozzle core structure comprises a nozzle tip body, a steel insert, a metal covering part and a nozzle tip pressing cap, a nozzle tip runner is arranged in the nozzle tip body, and the nozzle tip end part of the nozzle tip body is provided with a first assembly position and a nozzle tip via hole; the steel insert is embedded into the first assembly position in an interference assembly manner, and the steel insert is positioned around the nozzle tip via hole; the metal covering part covers the joint of the steel insert and the nozzle tip body; a second assembly position is arranged in the nozzle tip pressing cap, the nozzle tip body is inserted into the second assembly position in an interference assembly mode, and the nozzle tip body and the nozzle tip pressing cap are coaxially arranged. The nozzle core structure can solve the problem that a nozzle core structure in the prior art cannot give consideration to heat conductivity and wear resistance at the same time.

Description

TECHNICAL FIELD

[0001] The utility model relates to hot runner injection molding technical field especially relates to a hot runner system, hot nozzle assembly and nozzle core structure. BACKGROUND

[0002] Injection mold is a kind of tool for producing plastic product, and is the tool for giving plastic product complete structure and accurate size.Injection mold obtains product with certain shape after resin material is injected into metal model;The structure of mold can be varied although due to the different plastic varieties and properties, the shape and structure of plastic product and the type of injection machine etc., but the basic structure is consistent.In order to make the product size more accurate, precision injection mold is commonly used to produce products.

[0003] In the needle valve type hot runner system, the valve needle is driven to move by the valve needle driving system, the valve needle moves in the hot nozzle assembly, and the end of the valve needle cooperates with the gate, and then the opening and closing of the gate are realized.The main functions of the nozzle core structure are to control the heat of the gate and to help the valve needle to be aligned before the valve needle enters the gate.

[0004] In the prior art, the heat of the gate is generally controlled by changing the thermal conductivity of the material of the nozzle core structure to adapt to the characteristics of different injection molding materials, and the nozzle tip material is generally copper material or steel material, and the thermal conductivity of copper is better than that of steel.Usually, when the valve needle is opened, the valve needle and the gate are concentric, and when the valve needle is closed, the valve needle and the gate are concentric through the nozzle tip hole guide, so as to reduce the risk of collision between the valve needle and the gate.If there is no guide of the nozzle tip hole, the gate is easy to be worn by the valve needle.Therefore, it is urgent to develop a nozzle core structure that can ensure good thermal conductivity and good wear resistance. UTILITY MODEL CONTENTS

[0005] In view of the above technical problems, the utility model provides a hot runner system, a hot nozzle assembly and a nozzle core structure to solve the problem that the nozzle core structure in the prior art cannot simultaneously consider thermal conductivity and wear resistance.

[0006] To achieve the above purpose, the utility model provides a nozzle core structure, which comprises:

[0007] The nozzle tip body is provided with a nozzle tip runner, and the nozzle tip end of the nozzle tip body has a first assembly position and a nozzle tip hole;

[0008] The steel insert is embedded in the first assembly position by interference assembly, and the nozzle tip runner penetrates through the nozzle tip body and the steel insert, and the steel insert is located around the nozzle tip hole;

[0009] A metal covering part is arranged on the end surface of the tip end part, and covers the joint between the steel insert and the tip body.

[0010] A tip cap is provided with a second assembly position, and the tip body is inserted into the second assembly position by interference assembly, and the tip body and the tip cap are coaxially arranged.

[0011] As an optional technical solution, an outer side end portion of the tip cap adjacent to the tip via hole is formed with a cap sealant position, and the tip via hole and the cap sealant position are formed by the same process.

[0012] As an optional technical solution, the diameter of the tip via hole is 3.8mm, and the tolerance of the tip via hole is 0-0.01mm; the diameter of the cap sealant position is 14.99mm, and the tolerance of the cap sealant position is 0-0.005mm.

[0013] As an optional technical solution, the metal covering part is a three-dimensional printing layer.

[0014] The utility model also provides a hot nozzle assembly, the hot nozzle assembly includes:

[0015] A hot nozzle body is provided with a hot nozzle flow channel and a tip mounting groove, and the end of the hot nozzle body is provided with a gate.

[0016] The tip core structure is mounted in the tip mounting groove, the tip cap is arranged between the hot nozzle body and the tip body, the hot nozzle body, the tip body and the tip cap are coaxially arranged, and the hot nozzle flow channel and the tip flow channel are matched and communicated with each other and the gate.

[0017] A valve needle passes through the hot nozzle flow channel and the tip flow channel and is positioned through the tip via hole to control the opening and closing of the gate.

[0018] As an optional technical solution, a sealant sleeve is sleeved on the first end portion of the hot nozzle body adjacent to the tip via hole, and the gate is arranged on the sealant sleeve and communicated with the tip via hole.

[0019] As an optional technical solution, a heater is fixedly arranged on the periphery of the hot nozzle body.

[0020] The utility model also provides a hot runner system, and the hot runner system comprises the hot nozzle assembly.

[0021] As an optional technical solution, the sealing sleeve is sleeved on the first end of the hot nozzle body adjacent to the nozzle tip through hole, and the pouring gate is arranged on the sealing sleeve and communicates with the nozzle tip through hole.

[0022] Compared with the prior art, the utility model discloses through optimizing structure design, the nozzle core structure improves the strength of the nozzle tip through hole, improves the concentricity of the nozzle tip through hole, makes the nozzle core structure more wear -resistant, reduces the wear and tear of the valve needle to the pouring gate when guaranteeing the heat conduction performance. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the specific embodiment of the utility model or the technical scheme in the prior art, the drawings needed in the specific embodiment or the prior art description will be briefly introduced as follows, and obviously, the drawings in the following description are some embodiments of the utility model, and those skilled in the art can also obtain other drawings according to these drawings without creating creative labor.

[0024] Figure 1 It is the schematic diagram of the nozzle core structure of an embodiment of the utility model;

[0025] Figure 2 It is the schematic diagram of the first state of the hot nozzle assembly of an embodiment of the utility model;

[0026] Figure 3 It is the schematic diagram of the second state of the hot nozzle assembly of an embodiment of the utility model;

[0027] Figures 4-9 It is the flow schematic diagram of the processing method of the nozzle core structure of an embodiment of the utility model. DETAILED DESCRIPTION

[0028] In order to make the purpose, the structure, the features and the function of the utility model further understand, the detailed description of the embodiment is as follows.

[0029] In the description of the utility model, it is explained that the orientation or position relationship of the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like is based on the orientation or position relationship shown in the drawing, and is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, a particular orientation and operation, therefore, it can not be understood as the limitation of the utility model.

[0030] Please see Figure 1 , Figure 1The utility model provides a kind of core structure, the core structure 1 includes tip body 2, steel insert 3, metal covering part 4 and tip cap 5. Among them, tip channel 21 is provided in the tip body 2, and the tip end portion 22 of the tip body 2 has first assembly site 23 and tip via hole 24. The steel insert 3 is embedded in the first assembly site 23 by interference assembly mode, and the tip channel 21 penetrates the tip body 2 and the steel insert 3, and the steel insert 3 is located around the tip via hole 24, wherein the above-mentioned steel insert 3 has high hardness. Metal covering part 4 is set on the end face 221 of the tip end portion 22, and the metal covering part 4 covers the joint of the steel insert 3 and the tip body 2. The tip cap 5 has second assembly site 51 in it, and the tip body 2 is inserted into the second assembly site 51 by interference assembly mode, and the tip body 2 and the tip cap 5 are coaxially arranged, and the outer side end portion of the tip cap 5 adjacent to the tip via hole 24 is formed with cap sealant position 52. Moreover, cap sealant position 52 is formed directly on tip cap 5, so that less heat is transmitted, heat loss is avoided, and the heat of the end portion of the core structure is sufficient.

[0031] Preferably, the diameter D1 of the tip via hole 24 is 3.8mm, and the tolerance of the tip via hole 24 is 0-0.01mm; the diameter D2 of the cap sealant position 52 is 14.99mm, and the tolerance of the cap sealant position 52 is 0-0.005mm. Moreover, preferably, the tip via hole 24 and the cap sealant position 52 are processed by the same process, because the tip via hole 24 and the cap sealant position 52 are processed together, the tolerance of the two is closer, the size is more accurate, the concentricity can be better guaranteed, and the tip via hole 24 can be better guided to the valve needle.

[0032] In an embodiment, the metal covering part 4 is a three-dimensional printing layer, and the metal covering part 4 is set to prevent the steel insert 3 from falling off, so after the tip body 2 and the steel insert 3 are extruded and interference-fitted, a layer of metal material is printed on the end face 221 of the tip end portion 22 by 3D printing technology.

[0033] In an embodiment, the core structure is made of copper material, and the copper material has very good thermal conductivity.

[0034] In an embodiment, the inside of the tip body 2 is provided with a guide surface 25 at least adjacent to the tip via hole 24, and the guide surface 25 is an arc surface or an inclined surface.

[0035] In addition, please refer to Figure 2 And Figure 3 , Figure 2It is a schematic view of the first state of the hot nozzle assembly of an embodiment of the utility model; Figure 3 The utility model also provides a hot nozzle assembly 6, the hot nozzle assembly 6 includes hot nozzle body 7, the nozzle core structure 1 as described above and valve needle 8. Hot nozzle flow channel 71 and tip mounting groove 72 are arranged in the hot nozzle body 7, and the end of the hot nozzle body 7 is provided with a gate 73. The nozzle core structure 1 is installed in the tip mounting groove 72, the tip pressing cap 5 is arranged between the hot nozzle body 7 and the tip body 2, the hot nozzle body 7, the tip body 2 and the tip pressing cap 5 are coaxially arranged, and the hot nozzle flow channel 71 and the tip flow channel 21 are matched with each other and communicate with the gate 73. The valve needle 8 passes through the hot nozzle flow channel 71 and the tip flow channel 21 and is positioned through the tip via hole 24 to control the opening and closing of the gate 73.

[0036] In an embodiment, the hot nozzle assembly 6 further comprises a sealing sleeve 9, which is sleeved on the first end of the hot nozzle body 7 adjacent to the tip via hole 24, and the gate 73 is arranged on the sealing sleeve 9 and communicates with the tip via hole 24.

[0037] In addition, in an embodiment, the hot nozzle assembly 6 further comprises a heater 10, which is fixedly arranged on the periphery of the hot nozzle body 7, for example, fixed on the hot nozzle body 7 by a fixing member. After the molten glue enters the hot nozzle flow channel 71, the heater 10 generates heat to keep the glue in the hot nozzle flow channel 71 and the tip flow channel 21 in a molten state, and then the molten glue flows out from the gate 73 after passing through the tip via hole 24.

[0038] Please continue to see Figure 2 and Figure 3 , when the hot nozzle assembly is in the first state (as shown in Figure 2 ), that is, when the valve needle 8 is open, the valve needle 8 and the gate 73 are concentric, and when the valve needle 8 is closed, the valve needle 8 needs to be guided through the tip via hole 24 to make the valve needle 8 and the gate 73 concentric, thereby reducing the risk of collision between the valve needle 8 and the gate 73. As shown in Figure 3 , the hot nozzle assembly is in the second state, at this time, after the valve needle 8 is guided through the tip via hole 24, the gate 73 is blocked, and the gate 73 is closed.

[0039] That is, in actual operation, the valve needle 8 occupies part of the tip via hole 24 and is separated from the gate 73, and the gate 73 is open; and the valve needle 8 penetrates the tip via hole 24 and blocks the gate 73, and the gate 73 is closed.

[0040] In addition, the utility model also provides a hot runner system, the hot runner system includes the hot nozzle subassembly 6 as described above. The hot runner system mainly lies in the structure design cooperation of nozzle core structure 1 and hot nozzle body 6, and the injection molding process belongs to the conventional flow. The glue material passes through injection nozzle, shunt plate, hot nozzle body 7, nozzle tip body 2 in turn, and the glue is sealed by the action of valve needle 8 and goes up to complete the whole injection molding process.

[0041] In addition, as Figures 4-9 indicated, Figures 4-9 the processing method of the nozzle core structure of the utility model embodiment, the processing method of the nozzle core structure includes the following steps:

[0042] S1, form nozzle tip body blank 211, the nozzle tip end of nozzle tip body blank 211 has first assembly position 212, and form steel insert 31 matched with first assembly position 212, as Figure 4 indicated;

[0043] S2, the steel insert 31 is embedded in the first assembly position 212 by interference assembly, as Figure 5 indicated;

[0044] S3, form metal cover part 41 on the end face 213 of the nozzle tip end, obtain nozzle tip body semi-finished product, the metal cover part 41 covers the junction of the steel insert 31 and the first assembly position 212, as Figure 4 and Figure 5 indicated;

[0045] S4, rough machining nozzle tip body semi-finished product and rough machining to form nozzle tip pressure cap semi-finished product, the nozzle tip pressure cap semi-finished product 511 has second assembly position 512, as Figure 6 and Figure 7 indicated;

[0046] S5, the nozzle tip body semi-finished product obtained by rough machining is inserted into the second assembly position 512 by interference assembly, to form nozzle core structure semi-finished product, as Figure 8 indicated;

[0047] S6, the nozzle core structure semi-finished product is finished, to form nozzle tip body 217, nozzle tip pressure cap 513, nozzle tip runner 214, nozzle tip via hole 215 and pressure cap glue sealing position 216, obtain the nozzle core structure, the nozzle tip runner 214 penetrates the nozzle tip body 217 and the steel insert 31, the steel insert 31 is located around the nozzle tip via hole 215, the nozzle tip body 217 and the nozzle tip pressure cap 513 are coaxially arranged, the pressure cap glue sealing position 216 is formed on the outer side end of the nozzle tip pressure cap 513 adjacent to the nozzle tip via hole 215, asFigure 9 as shown.

[0048] In summary, the utility model discloses through optimizing structure design, the strength of the tip via is improved when the core structure guarantees the heat conduction performance, the concentricity of the tip via is improved, the core structure is more wear -resistant, and the wear of the valve needle to the gate is reduced.

[0049] The utility model has been described by the above related embodiment, however the above embodiment is only the example of implementation the utility model. In addition, the technical features involved in the different implementation manners of the utility model described above can be combined as long as they do not constitute conflict. It must be pointed out that the disclosed embodiment does not limit the scope of the utility model. On the contrary, the change and the decoration made without departing from the spirit and the scope of the utility model all belong to the patent protection scope of the utility model.

Claims

1. A nozzle core structure, characterized in that: The nozzle core structure includes: A nozzle tip body, wherein a nozzle tip flow channel is provided in the nozzle tip body, and a nozzle tip portion of the nozzle tip body has a first assembly position and a nozzle tip through hole; a steel insert, the steel insert being embedded in the first assembly position by interference fitting, the nozzle tip flow channel penetrating the nozzle tip body and the steel insert, and the steel insert being located around the nozzle tip through hole; a metal covering portion, disposed on the end surface of the nozzle tip, and covering the junction between the steel insert and the nozzle tip body; and The nozzle tip pressure cap has a second assembly position, the nozzle tip body is inserted into the second assembly position by interference fitting, and the nozzle tip body and the nozzle tip pressure cap are coaxially arranged.

2. The tip structure according to claim 1, wherein: A pressure cap sealing position is formed at the outer end of the nozzle tip pressure cap adjacent to the nozzle tip through hole, and the nozzle tip through hole and the pressure cap sealing position are formed in the same process.

3. The tip structure according to claim 2, wherein: The diameter of the nozzle tip through hole is 3.8 mm, and the tolerance of the nozzle tip through hole is 0-0.01 mm; the diameter of the pressure cap sealing position is 14.99 mm, and the tolerance of the pressure cap sealing position is 0-0.005 mm.

4. The tip structure according to claim 1, wherein: The metal covering portion is a three-dimensional printing layer.

5. The tip structure according to claim 1, wherein: A guide surface is provided inside the nozzle tip body at least adjacent to the nozzle tip through hole, and the guide surface is a curved surface or an inclined surface.

6. A hot nozzle assembly, characterized in that: The hot nozzle assembly includes: A nozzle body, wherein a nozzle flow channel and a nozzle tip mounting groove are provided in the nozzle body, and a gate is provided at the end of the nozzle body; The nozzle core structure according to any one of claims 1 to 5, wherein the nozzle core structure is installed in the nozzle tip installation groove, the nozzle tip pressure cap is arranged between the hot nozzle body and the nozzle tip body, the hot nozzle body, the nozzle tip body and the nozzle tip pressure cap are coaxially arranged, and the hot nozzle runner and the nozzle tip runner match each other and flow and connect the gate; and A valve needle passes through the hot nozzle flow channel and the nozzle tip flow channel and is positioned through the nozzle tip through hole to control the opening and closing of the gate.

7. The hot nozzle assembly according to claim 6, wherein: It also includes a sealing sleeve, which is sleeved on the first end of the hot nozzle body adjacent to the nozzle tip through hole, and the sealing sleeve is provided with the gate, which is connected to the nozzle tip through hole.

8. The hot nozzle assembly according to claim 6, wherein: It also includes a heater, which is fixedly arranged on the periphery of the hot nozzle body.

9. A hot runner system, characterized in that: The hot runner system includes the hot nozzle assembly as claimed in claim 6.

10. The hot runner system according to claim 9, wherein: It also includes a sealing sleeve, which is sleeved on the first end of the hot nozzle body adjacent to the nozzle tip through hole, and the sealing sleeve is provided with the gate, which is connected to the nozzle tip through hole.

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