Novel FEP (fluorinated ethylene propylene) double-core co-extrusion die

Abstract

The utility model discloses a novel FEP (fluorinated ethylene propylene) double-core co-extrusion die. The mold comprises a mold core and a mold sleeve, a through mold sleeve inner cavity is formed in the mold sleeve and used for containing the mold core, the mold core comprises a rear inner mold with a first inner cavity, a front inner mold with a second inner cavity is coaxially embedded in the front end of the rear inner mold, and the first inner cavity and the second inner cavity are communicated and used for containing a core wire of a cable. According to the utility model, the extrusion mode of the FEP double-core co-extrusion cable is changed into a solid mode from an original falling mode, and the extruded FEP double-core co-extrusion cable is stable in related characteristics, thereby effectively reducing the damage and improving the benefit.

Description

Technical Field

[0001] The utility model relates to the technical field of cable extrusion dies, in particular to a novel FEP double-core co-extrusion die. Background Art

[0002] The existing FEP extrusion technology is of the lead-down type. The extrusion mold material is generally a nickel-chromium alloy, and the maximum precision of the double-core inner mold hole is only + / -0.005 mm, resulting in unstable related characteristics of the extruded FEP double-core co-extruded cable. Utility Model Content

[0003] The utility model provides a new type of FEP double-core co-extrusion die. The precision of the double-core inner die hole of the utility model is 0.002mm, and the extrusion method is changed from the original lead-down method to the solid method, which solves the problem of unstable characteristics of the current extruded FEP double-core co-extrusion cable.

[0004] The technical solution adopted by the utility model is:

[0005] It includes a mold core and a mold sleeve, wherein the mold sleeve has a through mold sleeve inner cavity for accommodating the mold core, the mold core includes a rear inner mold with a first inner cavity, and the front end of the rear inner mold is coaxially embedded with a front inner mold with a second inner cavity, the first inner cavity and the second inner cavity are connected to accommodate the core wire of the cable.

[0006] The front end of the front inner mold is provided with two inner mold holes connected with the second inner cavity, the front ends of the two inner mold holes are connected with the mold sleeve inner cavity of the mold sleeve, and the center distance between the two inner mold holes is 0.002mm.

[0007] The two inner mold holes are symmetrically arranged on both sides with the center of the front end surface of the front inner mold as the center.

[0008] The front end of the rear inner mold is provided with a central countersunk hole, and the front inner mold is embedded in the central countersunk hole so that the rear inner mold and the front inner mold are axially coaxially positioned and embedded.

[0009] The front and rear ends of the first inner cavity of the rear inner mold are both opened through in the axial direction, and the rear end of the second inner cavity of the front inner mold is opened through in the axial direction.

[0010] The material of the front inner mold is tungsten steel.

[0011] The material of the rear inner mold is nickel-chromium alloy.

[0012] There is a gap between the mold core and the mold sleeve, and the gap is a flow channel for feeding FEP material.

[0013] The beneficial effect of the utility model is that when using traditional extrusion equipment, the extrusion method is changed from the original lead-down method to a solid method, the relevant characteristics of the extruded FEP double-core co-extruded cable are stable, the production loss is effectively reduced, and the efficiency is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the overall extrusion structure of the utility model mold

[0015] Figure 2 It is a schematic diagram of the front inner mold structure of the mold of the utility model.

[0016] Figure 3 This is a schematic diagram of the mold structure of the utility model.

[0017] In the figure: front inner mold 1; rear inner mold 2; inner mold hole 3; mold core 4; mold sleeve 5; core wire 6; runner 7. DETAILED DESCRIPTION

[0018] The utility model is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0019] like Figure 1 and Figure 2 As shown, the dual-core co-extrusion mold includes a mold core 4 and a mold sleeve 5. The mold sleeve 5 has a through mold sleeve inner cavity for accommodating the mold core 4. The mold core 4 includes a rear inner mold 2 with a first inner cavity. The front end of the rear inner mold 2 is coaxially embedded with a front inner mold 1 with a second inner cavity. The first inner cavity and the second inner cavity are connected to each other, and are used to accommodate the core wire 6 of the cable, or to pass the extruded material.

[0020] Two inner mold holes 3 connected to the second inner cavity are opened at the front end of the front inner mold 1, the rear ends of the two inner mold holes 3 are connected to the second inner cavity, the front ends of the two inner mold holes 3 are connected to the mold sleeve inner cavity of the mold sleeve 5, the center distance between the two inner mold holes 3 is 0.002mm, and the two inner mold holes 3 are symmetrically arranged on both sides with the center of the front end face of the front inner mold 1 as the center.

[0021] A central countersunk hole is provided at the front end of the rear inner mold 2, and the front inner mold 1 is embedded in the central countersunk hole so that the rear inner mold 2 and the front inner mold 1 are axially coaxially positioned and embedded; the front and rear ends of the first inner cavity of the rear inner mold 2 are axially through-opened, and the rear end of the second inner cavity of the front inner mold 1 is axially through-opened. The precision requirement of the front inner mold is + / -0.002 mm. The material of the front inner mold 1 is tungsten steel, and the material of the rear inner mold 2 is nickel-chromium alloy.

[0022] There is a gap between the mold core 4 and the mold sleeve 5. The gap is a flow channel 7 for feeding FEP material. The FEP material directly contacts the core wire 6.

[0023] Specifically, the first inner cavity of the rear inner mold 2 includes a first cylindrical cavity in the rear section and a first truncated cone shaped cavity in the front section, and the first cylindrical cavity and the first truncated cone shaped cavity are connected; the second inner cavity of the front inner mold 1 includes a second cylindrical cavity in the rear section and a second truncated cone shaped cavity in the front section, and the second cylindrical cavity and the second truncated cone shaped cavity are connected, and the second cylindrical cavity and the first truncated cone shaped cavity are connected, and two inner mold holes 3 are arranged at the ends of the second truncated cone shaped cavity.

[0024] The mold sleeve inner cavity of the mold sleeve 5 includes a conical cavity at the rear section and a third cylindrical cavity at the front section. The rear end opening of the conical cavity is larger than the front end opening, and the front side of the front end opening is connected to the third cylindrical cavity.

[0025] The working process of the utility model is as follows:

[0026] After the two core wires 6 pass through the inner cavity of the inner mold 2 and the inner cavity of the front inner mold 1 respectively, they pass through the two inner mold holes 3 at the end of the front inner mold 1. At this time, FEP material is fed into the flow channel 7 between the mold core 4 and the mold sleeve 5. Since there is no lead-down device, the FEP material directly contacts the two core wires 6 to achieve a solid molding method, and is extruded through the inner cavity of the mold sleeve 5 together. Through the precise control of 0.002mm of the inner mold hole 3, the parallel distance between the two conductors of the double-core co-extruded cable is stable, ensuring the characteristics of the finished double-core co-extruded cable.

Claims

1. A new type of FEP double-core co-extrusion die, characterized by: The mold core (4) comprises a mold sleeve (5), wherein the mold sleeve (5) has a through mold sleeve inner cavity for accommodating the mold core (4), and the mold core (4) comprises a rear inner mold (2) having a first inner cavity, and a front inner mold (1) having a second inner cavity is coaxially embedded in the front end of the rear inner mold (2), and the first inner cavity and the second inner cavity are connected to each other and are used to accommodate the core wire (6) of the cable.

2. The novel FEP double-core co-extrusion die according to claim 1 is characterized in that: The front end of the front inner mold (1) is provided with two inner mold holes (3) connected to the second inner cavity. The front ends of the two inner mold holes (3) are connected to the mold sleeve inner cavity of the mold sleeve (5). The center distance between the two inner mold holes (3) is 0.002 mm.

3. The novel FEP dual-core co-extrusion die according to claim 2 is characterized in that: The two inner mold holes (3) are symmetrically arranged on both sides with the center of the front end surface of the front inner mold (1) as the center.

4. The novel FEP dual-core co-extrusion die according to claim 1 is characterized in that: The front end of the rear inner mold (2) is provided with a central countersunk hole, and the front inner mold (1) is embedded in the central countersunk hole so that the rear inner mold (2) and the front inner mold (1) are axially coaxially positioned and embedded.

5. The novel FEP dual-core co-extrusion die according to claim 1 is characterized in that: The front and rear ends of the first inner cavity of the rear inner mold (2) are both axially through-opened, and the rear end of the second inner cavity of the front inner mold (1) is axially through-opened.

6. The novel FEP dual-core co-extrusion die according to claim 1 is characterized in that: The material of the front inner mold (1) is tungsten steel.

7. The novel FEP dual-core co-extrusion die according to claim 1 is characterized in that: The material of the rear inner mold (2) is nickel-chromium alloy.

8. The novel FEP dual-core co-extrusion die according to claim 1 is characterized in that: There is a gap between the mold core (4) and the mold sleeve (5), and the gap is a flow channel (7) for feeding FEP material.

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