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

Abstract

The invention 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 invention belongs to the field of PEEK material injection molding, and particularly relates to a multi-cavity injection molding mold for PEEK material. Background Art

[0002] PEEK (polyetheretherketone) is a semi-crystalline, thermoplastic aromatic polymer material with flexibility, high hardness, high strength, high temperature resistance, small shrinkage, good stability and excellent processability. It is widely used in aerospace, automotive, electrical and electronic, medical and other industrial fields. Since the melting point of PEEK material is 343℃, its processing temperature needs to reach 350~390℃, so the molding temperature is high and the temperature range is narrow, and the mold temperature needs to be precisely controlled. However, the thermal insulation performance of current injection molds is generally low, which is not suitable for the injection molding of PEEK materials. Summary of the invention

[0003] The present invention aims to provide a multi-cavity injection molding mold of PEEK material to solve the problem that the mold in the prior art has low thermal insulation performance and is not suitable for injection molding of PEEK material.

[0004] A multi-cavity injection molding mold of PEEK material in this scheme includes an upper mold and a lower mold, wherein the lower mold is provided with a mold core, an ejection mechanism is provided in the lower mold, and an injection port is provided on the upper mold; a hot oil flow channel is provided in the lower mold around the mold core, the hot oil flow channel is connected with an inlet pipe and an outlet pipe, and an insulation layer is provided on the outside of the lower mold; a heating rod is provided in the lower mold, and the heating rod is located below the mold core.

[0005] The beneficial effects of the present invention are:

[0006] 1. The present invention arranges hot runners at multiple points around the mold core, so that the mold is heated evenly and the temperature is precisely controlled, which is very suitable for the injection molding production of PEEK materials with high molding temperature and narrow temperature range.

[0007] 2. PEEK material is a high-performance special engineering plastic product. In order to improve the crystallinity and surface finish during injection molding, this solution uses a heating rod to heat the mold, especially the mold core. The heating rod heating method is the most economical.

[0008] 3. The mold is equipped with a heat insulation layer. As the mold temperature rises, the clamping force needs to be adjusted. In order to reduce heat dissipation, the inside of the mold is insulated; at the same time, it also prevents the outside of the mold from getting hot, which plays a safety protection role.

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

[0010] Furthermore, the longitudinal cross-section of the hot oil flow channel is circular or isosceles trapezoidal.

[0011] Furthermore, 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 the surface finish of the injection molded product.

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

[0013] Furthermore, the material of the thermal insulation layer is super heat-resistant epoxy resin. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic structural diagram of a multi-cavity injection molding mold for PEEK material of the present invention;

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

[0016] The following is further described in detail through specific implementation methods:

[0017] The reference numerals in the drawings of the specification 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, thermal insulation layer 8, hot oil flow channel 9, heating rod 10.

[0018] The embodiment is basically as shown in the attached Figure 1 As shown: a multi-cavity injection molding mold for PEEK material, including an upper mold 1 and a lower mold 4, the four corners of the lower mold 4 are provided with guide pillars 3, and the upper mold 1 is provided with a guide sleeve. The lower mold 4 is provided with a mold core, and the lower mold 4 is provided with an ejection mechanism 5 to assist in demolding the molded PEEK, and the upper mold is provided with an injection port 101; Figure 2 As shown, the lower mold 4 is provided with a hot oil flow channel 9 located around the mold core, the hot oil flow channel 9 is connected with an inlet pipe 6 and an outlet pipe 7, and the outside of the lower mold 4 is provided with a heat insulation layer 8 made of super heat-resistant epoxy resin; the lower mold 4 is provided with a heating rod 10, the hot oil flow channel 9 and the heating rod 10 are both located below the mold core, and the heating rod 10 is connected to an external power supply.

[0019] The longitudinal section of the hot oil flow channel 9 is circular, and can also be designed as an isosceles trapezoid. The material of the mold core is selected from chrome 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 conducive to improving the service life of the mold and the surface finish of the injection molded product.

[0020] After the upper mold 1 and the lower mold 4 are closed, the molten PEEK material is injected from the injection port 101, and the high-temperature hot oil is introduced from the introduction pipe 6 to heat and insulate the inside of the mold and the mold core, thereby promoting the plastic in the mold to maintain temperature and facilitate molding. During the molding process, the heat insulation layer 8 hinders the heat dissipation of the mold, plays the role of internal heat preservation and external scalding protection, and finally obtains the PEEK plate 2.

[0021] In general, the present invention arranges hot runners at multiple points around the mold core, so that the mold is heated evenly and the temperature is precisely controlled, which is very suitable for the injection molding production of PEEK materials with high molding temperatures and narrow temperature ranges. As a high-performance special engineering plastic product, PEEK material uses a heating rod 10 to heat the mold, especially the mold core, during injection molding in order to improve the crystallinity and surface finish. The heating method of heating with the heating rod 10 is the most economical. The mold is provided with a heat insulation layer 8, and the clamping force needs to be adjusted as the temperature of the mold increases. In order to reduce heat dissipation, the inside of the mold is insulated; at the same time, it also prevents the outside of the mold from getting hot, which plays a safety protection role. The position design of the heating rod 10 on the mold also ensures that each cavity on the core is heated evenly.

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

Claims

1. A multi-cavity injection molding mold for PEEK material, comprising an upper mold and a lower mold, wherein the lower mold is provided with a mold core, an ejection mechanism is provided in the lower mold, and an injection port is provided on the upper mold; characterized in that: The lower mold is provided with a hot oil flow channel around the mold core, the hot oil flow channel is connected with an inlet pipe and an outlet pipe, and a heat insulation layer is provided outside the lower mold; the lower mold is provided with a heating rod, and the heating rod is located below the mold core.

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

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

2.

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

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

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