Multi-cavity injection molding mold for PEEK (Polyether-Ether-Ketone) material

Abstract

The utility model discloses a multi-cavity injection molding mold for PEEK materials in the field of PEEK material injection molding, which comprises an upper mold and a lower mold, a mold core is arranged on the lower mold, an ejection mechanism is arranged in the lower mold, and an injection molding port is arranged on the upper mold; a hot oil runner located around the mold core is arranged in the lower mold, the hot oil runner is communicated with a leading-in pipe and a leading-out pipe, and a heat insulation layer is arranged outside the lower mold; and a heating rod is arranged in the lower mold and is positioned below the mold core. The hot runners are distributed at multiple points around the mold core, so that the mold is uniformly heated, the temperature is accurately controlled, and the mold is very suitable for injection molding production of PEEK materials with high molding temperature and narrow temperature interval. The mold is provided with a heat insulation layer, and mold locking force needs to be adjusted along with temperature rise of the mold. In order to reduce heat dissipation, heat preservation is conducted on the interior of the mold; meanwhile, the outside of the mold is prevented from being hot, and the safety protection effect is achieved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the field of PEEK material injection moulding, especially relates to a multi-cavity injection moulding mould of PEEK material. BACKGROUND

[0002] PEEK (polyether ether ketone) is a kind of semi-crystalline, thermoplastic aromatic polymer material, with flexibility and high hardness, high strength, high temperature resistance, small shrinkage, good stability and excellent processability. It is widely used in aerospace, automobile, electronics and electrical, medical and other industrial fields. Since the melting point of PEEK material is 343 DEG C, so its processing temperature needs to reach 350-390 DEG C, so the forming temperature is high and the temperature interval is narrow, and the mould temperature needs to be controlled accurately. The heat preservation performance of the current injection mould is generally low, and it is not suitable for the injection moulding of PEEK material. UTILITY MODEL CONTENTS

[0003] The utility model is intended to provide a multi-cavity injection moulding mould of PEEK material to solve the problem of low mould heat preservation performance in the prior art, which is not suitable for the injection moulding of PEEK material.

[0004] The multi-cavity injection moulding mould of PEEK material in the scheme comprises an upper mould and a lower mould, the lower mould is provided with a mould core, the lower mould is provided with an ejection mechanism, and the upper mould is provided with an injection port;The lower mould is provided with a hot oil runner around the mould core, the hot oil runner is communicated with a lead-in pipe and a lead-out pipe, and the lower mould is provided with a heat insulation layer outside;The lower mould is provided with a heating rod, and the heating rod is located below the mould core.

[0005] The utility model has the advantages that:

[0006] 1、The utility model arranges hot runner around the mould core in multiple points, so that the mould is evenly heated, the temperature is accurately controlled, and it is very suitable for the injection production of PEEK material with high forming temperature and narrow temperature interval.

[0007] 2、PEEK material is a kind of high-performance special engineering plastic product, when injection moulding, in order to improve crystallinity and surface finish, the scheme adopts heating rod to heat and warm the mould, especially the mould core, and the heating rod warming mode is the most economical.

[0008] 3、The mould is provided with a heat insulation layer, and the locking force needs to be adjusted as the temperature of the mould rises. In order to reduce heat dissipation, the inside of the mould is heat preserved;At the same time, it also prevents the outside of the mould from being hot, and plays a safety protection role.

[0009] 4、The position of the heating rod on the mould also ensures that each cavity of the mould core is heated evenly.

[0010] Further, the longitudinal section of the hot oil runner is circular or isosceles trapezoidal.

[0011] Furthermore, the surface finish of the mold core is less than or equal to Ra0.2. This high requirement for mold core surface finish is beneficial for extending the service life of the mold and also for improving the surface finish of the injection molded product.

[0012] Furthermore, the material of the mold core is selected from one of chromium steel, carbon tool steel, alloy mold steel, and high-speed tool steel.

[0013] Furthermore, the material of the heat insulation layer is ultra-heat resistant epoxy resin. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of a multi-cavity injection molding die for PEEK material according to this utility model;

[0015] Figure 2 for Figure 1 Cross-sectional view along the AA direction. Detailed Implementation

[0016] The following detailed description illustrates the specific implementation method:

[0017] The reference numerals in the accompanying drawings include: upper mold 1, injection port 101, PEEK plate 2, guide pillar 3, lower mold 4, ejection mechanism 5, inlet pipe 6, outlet pipe 7, heat insulation layer 8, hot oil channel 9, heating rod 10.

[0018] The basic implementation examples are as follows: Figure 1 As shown: A multi-cavity injection mold for PEEK material includes an upper mold 1 and a lower mold 4. Guide pillars 3 are provided at the four corners of the lower mold 4, and guide sleeves are correspondingly provided on the upper mold 1. A mold core is provided on the lower mold 4, and an ejection mechanism 5 is provided inside the lower mold 4 to assist in demolding the molded PEEK. An injection port 101 is provided on the upper mold. Figure 2 As shown, the lower mold 4 is provided with a hot oil channel 9 located around the mold core. The hot oil channel 9 is connected to an inlet pipe 6 and an outlet pipe 7. The lower mold 4 is provided with a heat insulation layer 8 made of ultra-heat resistant epoxy resin. The lower mold 4 is provided with a heating rod 10. The hot oil channel 9 and the heating rod 10 are both located below the mold core. The heating rod 10 is connected to an external power supply.

[0019] The longitudinal cross-section of the hot oil runner 9 is circular, but it can also be designed as an isosceles trapezoid. The mold core material is selected from chromium steel, and the surface finish of the mold core is less than or equal to Ra0.2. The high requirement for the surface finish of the mold core is beneficial to improving the service life of the mold and also to improving the surface finish of the injection molded product.

[0020] After the upper die 1 and the lower die 4 are closed, the PEEK material in a molten state is injected from the injection port 101, high-temperature hot oil is introduced from the introduction pipe 6 to heat and keep warm the inside of the mold and the mold core, so as to promote the plastic in the mold to keep temperature and facilitate molding. In the molding process, the heat insulation layer 8 hinders heat dissipation of the mold, and has the effects of internal heat preservation and external anti-scalding, and finally the PEEK plate 2 is obtained.

[0021] Overall, the utility model is arranged with hot runners at multiple points around the mold core, so that the mold is uniformly heated and the temperature is accurately controlled, and it is very suitable for injection molding production of PEEK materials with high molding temperature and narrow temperature range. As a kind of high-performance special engineering plastic product, the PEEK material is heated and warmed by the heating rod 10 during injection molding in order to improve the crystallinity and surface smoothness. The heating rod 10 is the most economical way to warm up. The mold is provided with the heat insulation layer 8, and the clamping force needs to be adjusted as the temperature of the mold rises. In order to reduce heat dissipation, the inside of the mold is kept warm, and at the same time, the outside of the mold is prevented from being scalded, which plays a safety protection role. The position of the heating rod 10 on the mold also ensures that each cavity of the mold core is uniformly heated.

[0022] The material of the mold core in the scheme can also be selected from one of carbon tool steel, alloy mold steel and high-speed tool steel, and the same effect can be achieved.

Claims

1. A multi-cavity injection molding mold of PEEK material, comprising an upper mold and a lower mold, a mold core is arranged on the lower mold, an ejection mechanism is arranged in the lower mold, and an injection port is arranged on the upper mold; characterized in that: The lower mold is internally provided with a hot oil flow channel located around the mold core, the hot oil flow channel is communicated with an import pipe and an export pipe, and the lower mold is externally provided with a heat insulation layer; the lower mold is internally provided with a heating rod located below the mold core.

2. A multi-cavity injection molding tool for PEEK material according to claim 1, characterized in that: The longitudinal section of the hot oil flow channel is circular or isosceles trapezoidal.

3. A multi-cavity injection mould for PEEK material according to claim 2, characterised in that: The surface smoothness of the mold core is less than or equal to Ra0.

2.

4. A multi-cavity injection mould for PEEK material according to claim 3, characterised in that: The material of the mold core is selected from one of chromium steel, carbon tool steel, alloy die steel and high-speed tool steel.

5. A multi-cavity injection mould for PEEK material according to claim 4, characterised in that: The material of the heat insulation layer is super heat-resistant epoxy resin.

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