CN104795184A - Cable production process - Google Patents

Abstract

The invention discloses a cable production process, which comprises the following steps: 1) the method has the advantages of reasonable and simple process, corrosion resistance, oxidation resistance, long service life, suitability for various severe environments, no electric leakage phenomenon and high safety performance.

Description

A kind of cable production process

technical field

The invention relates to the field of cable manufacturing, in particular to a cable production process.

Background technique

The conventional production process of the insulation layer and outer sheath of the cable adopts the insulation extrusion/wrapping and sheath extrusion process. The production process is relatively complicated, the production process is difficult to control, and there are defects such as material loss and equipment investment. The production process is more complicated and difficult to control. The reason is that the conventional process is insulation and sheath extrusion. High temperature resistant materials such as polytetrafluoroethylene require a high temperature extrusion production line. The production process is complicated and difficult to control, and for larger diameter wires Cable production is more difficult, and large-diameter cables produced by extrusion are less flexible.

In addition, the Chinese patent number is: 201010168058.9, which discloses a new type of radio frequency coaxial cable and its production method that can be used for video surveillance lines, broadcast signal control, public TV antennas, radio communications, transmission systems and one-way control wiring. , which includes a copper core conductor, the outer side of the copper core conductor is sequentially covered with a polyethylene insulating layer, an aluminum foil Mylar layer, a bare copper braid layer and a polyvinyl chloride coating layer. The beneficial effects of the present invention are: The formulation of the outer PVC sheath of the coaxial cable and its extrusion process are improved and optimized, which enhances the cable's wear-resistant and lubricating ability, thereby reducing the difficulty of wire insertion and pulling out during interspersed wiring and dense wiring, and the problem of cable sheath damage . But its production process is complex, the production process is difficult to control, and the product cost is too high.

Contents of the invention

The technical problem to be solved by the present invention is to provide a cable production process to solve the above-mentioned multiple defects caused by the prior art.

In order to achieve the above object, the present invention provides the following technical solutions: a cable production process, characterized in that: comprising the following steps:

1) Single wire drawing, under the condition of 40--55 ℃, use a wire drawing machine to pass through a drawing die to draw the copper rod, and the diameter of the drawing is 0.5-1mm;

2) Monofilament annealing, annealing by annealing furnace, annealing temperature 650-680°C, annealing time 40-60 minutes, to make monofilament;

3) Twisting system, use 5 monofilaments to carry out concentric multi-twisting to form a conductive wire core, and use a compactor to compact the wire;

4) Cabling, 4 conductive wire cores are twisted into cables without back twisting, and the cables after cabling are bound;

5) Coating, covering the outer side of the cable with an insulating layer, the thickness of the insulating layer is 1-2mm.

Preferably, in the step 1), the drawing temperature is 38°C.

Preferably, in the step 2), the annealing temperature is 635° C., and the annealing time is 52 minutes.

Preferably, in step 5), an inner sheath is provided on the inner side of the insulating layer, and the inner sheath includes an extruded inner sheath and a wrapped inner sheath.

Preferably, in step 5), an outer sheath is provided on the outer side of the insulating layer, and the outer sheath is directly extruded by an extruder.

Preferably, in the step 5), a material is filled between the wire and the insulating layer while coating, and the material is polypropylene tape or non-woven fabric.

The beneficial effect of adopting the above technical scheme is: at normal temperature, the copper rod is passed through one or several die holes of the drawing die by the wire drawing machine, so that the cross section is reduced, the length is increased, and the strength is improved. In the first process, the main process parameter of wire drawing is the mold matching technology; the key to the annealing process is to prevent the oxidation of the copper wire. When the copper monofilament is heated to a certain temperature, the toughness of the monofilament is improved and the monofilament is reduced by recrystallization. In order to meet the requirements of the wire and cable for the conductive core; in order to improve the softness of the wire and cable for laying and installation, the conductive core is twisted with multiple monofilaments to reduce the occupied area of the wire and reduce the geometry of the cable. Dimensions, while stranding the conductors, adopt a compact form, so that the ordinary circular shape is changed into a semicircle, a fan shape, a tile shape, and a tightly pressed circle; for multi-core cables, in order to ensure the formability and reduce the shape of the cable, generally It needs to be twisted into a circle. The mechanism of stranding is similar to that of conductor stranding. Due to the large diameter of the stranding system, most of them adopt the non-back twisting method. The technical requirements for cable formation: prevent the twisting of the cable caused by the overturning of special-shaped insulated cores; prevent the insulation layer from being scratched , most cables are completed with two other processes at the same time as cable formation: one is filling to ensure the roundness and stability of the cable after cable formation; the other is binding to ensure that the cable core is not loose; the inner sheath is to protect the insulated core In order not to be scratched, it is necessary to properly protect the insulating layer. The inner sheath is divided into: extruded inner sheath (isolation sleeve) and wrapped inner sheath (cushion), and wrapped cushion instead of binding tape and cable forming process Simultaneously; the outer sheath is a structural part that protects the insulating layer of the wire and cable from environmental factors. The main function of the outer sheath is to improve the mechanical strength of the wire and cable, resist chemical corrosion, moisture-proof, waterproof, prevent cable burning, etc. , according to the different requirements of the cable, use the extruder to directly extrude the plastic sheath.

Detailed ways

Preferred embodiments of the present invention will be described in detail below.

Embodiment 1: a kind of cable production process is characterized in that: comprise the following steps:

1) Monofilament drawing, under the condition of 38°C, use a wire drawing machine to pass through a drawing die to draw the copper rod, and the diameter of the drawn wire is 0.5mm;

2) Monofilament annealing, annealing by annealing furnace, annealing temperature 675°C, annealing time 52 minutes, to make monofilament;

3) Twisting system, use 5 monofilaments to carry out concentric multi-twisting to form a conductive wire core, and use a compactor to compact the wire;

4) Cabling, 4 conductive wire cores are twisted into cables without back twisting, and the cables after cabling are bound;

5) Covering, covering the outer side of the cable with an insulating layer. The thickness of the insulating layer is 1mm. The inner side of the insulating layer is provided with an inner sheath. The inner sheath includes an extruded inner sheath and a wrapped inner sheath. The outer side of the insulating layer is provided There is an outer sheath, and the outer sheath is directly extruded by an extruder, and the material is filled between the wire and the insulating layer while covering, and the material is polypropylene tape or non-woven fabric.

Example 2: The rest is the same as Example 1, the difference is that in step 1), the temperature of monofilament drawing is 40 degrees Celsius, and the diameter of the drawn wire is 0.7 mm; in step 2), the annealing temperature is 650 °C, and the annealing The time is 40 minutes, and in step 5), the thickness of the insulating layer is 1.5mm.

Example 3: The rest is the same as Example 1, the difference is that in step 1), the temperature of monofilament drawing is 55 degrees Celsius, and the diameter of the drawn wire is 1 mm; in step 2), the annealing temperature is 680 °C, and the annealing time is For 60 minutes, step 5), the thickness of the insulating layer is 2mm.

After the above process steps, the cable samples are taken out, and the tested performance is as follows:

In the above three embodiments, under room temperature conditions, the cable works for 1 hour, the temperature of the wire body is 20°C, and the temperature of the wire body is 25°C after 10 hours. The temperature is 55°C, the heat dissipation effect of this coaxial cable is better; the coaxial cable is subjected to crimping experiments, and the bending angles of this coaxial cable are 15°, 40°, and 20°, while the bending angle of ordinary coaxial cables is >55°, The outer sheath is damaged after crimping 20 times; use a lighter to burn the coaxial cable, the coaxial cable burns after 3 minutes, and the ordinary coaxial cable catches fire after 1 minute.

The above is only the preferred embodiment of the present invention, it should be pointed out that for those skilled in the art, without departing from the inventive concept of the present invention, some modifications and improvements can also be made, and these all belong to the present invention. protection scope of the invention.

Claims (6)

1. a cable manufacturing process, is characterized in that: comprise the following steps:

Monofilament draws, and under the condition of 40--55 DEG C, utilizes wire drawing machine, stretched mould, and stretched by copper pole stock, the diameter of wire drawing is 0.5-1mm;

Monofilament is annealed, and is annealed by annealing furnace, annealing temperature 650-680 DEG C, and annealing time 40-60 minute, makes monofilament;

Strand system, uses 5 monofilament to carry out multiple strand with one heart and forms conductor wire core, adopt compacting machine to press wire;

4 conductor wire cores employings are carried out strand system without back twist mode and are made cable, carry out colligation to the cable after stranding by stranding;

Coated, coated insulation layer outside cable, thickness of insulating layer is 1-2mm.

2. cable manufacturing process according to claim 1, is characterized in that: in described step 1), and draw temperature is 38 DEG C.

3. cable manufacturing process according to claim 1, is characterized in that: described step 2) in, annealing temperature is 535 DEG C, and annealing time is 52 minutes.

4. cable manufacturing process according to claim 1, is characterized in that: in described step 5), and the inner side of insulating barrier is provided with sheath, and sheath comprises and extrudes sheath and wrapped sheath.

5. cable manufacturing process according to claim 1, is characterized in that: in described step 5), and the outside of insulating barrier is provided with oversheath, and oversheath is directly extruded by plastic extruding machine and forms.

6. cable manufacturing process according to claim 1, is characterized in that: in described step 5), while coated between wire and insulating barrier fill material, this material is polypropylene tape or nonwoven fabrics.