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Nylon rods used in mechanical, chemical, shipbuilding, steel, automobile, valve, etc

by:MPS     2020-10-03

nylon rod is a major by extrusion molding plastic semi-finished products, because of its molding process is relatively simple, and continuity of production, excellent performance and is widely used in mechanical, chemical, shipbuilding, steel, automobile, valve, etc, used to make gear, turbine, shaft sleeve, such as wear-resistant parts gasket valve;

however, the existing nylon rod in the process of production, due to the viscosity of the materials, extrusion pressure, temperature control and speed control, easy to cause the bar inside to produce the problem such as porosity, white core, the nylon rods after finishing the product mechanical properties such as tensile, impact and flexural strength of the will have a significant impact, especially in making high density products for the materials such as: valve seat, valve stem, valve gaskets, etc. , and once made the products of the nylon rods have air hole, white core can cause the air leakage of product, causing serious safety accidents.

the technical implementation elements:

in view of the situation of the existing technology, the present invention is to solve the technical problem is to provide a production can eliminate blowhole, white the nylon core rod production technology and production control system.

the invention to solve the above technical scheme adopted by the technical problems as follows: a kind of nylon rod production process, including the following steps:

step 1: using viscosity is greater than or equal to 3. 0 nylon ( PA6) New material slices into the extruder in, after six stages of extruder temperature control zone after extrusion, the extruder extrusion pressure in 0. 5mpa- 2. 5 mpa, the bar out of roundness less than or equal to 0. 15mm;

step 2: rod cooling, from extruder extrusion nylon rod into the water for cooling, cooling to 80 - slowly 100 ℃, accelerates a rod internal curing, so that the rod core can get extrusion screw at the top of the continuous full fill material, can reduce the porosity and white core rod inside.

step 3; Traction, after the second step cooling of nylon rod through the tractor traction, the tractor traction speed is in line with steps one extruder extrusion speed and makes the uniform steady extrusion;

step four: cut, after the tractor traction, according to the bar cutting length;

step 5: annealing heat treatment, will get the step 4 nylon rod into the constant temperature electric heating water bath to eliminate internal stress, the processing of making nylon molecules arranged spherulite, structure is more stable, remove the bar in the extrusion process for internal and external cooling contraction inconsistent and the orientation of macromolecule chain factors and the internal stress.

nylon rods with good tensile strength, impact strength, rigidity, abrasion resistance, chemical resistance, surface hardness, such as performance, high light transmittance, similar to optical glass, processing temperature is 300 - - - - - - - 315 ℃, molding processing, the need to strictly control the barrel temperature, melt temperature is too high will be caused by the degradation products, the low temperature will be because of the transparency of adverse effects and plasticizing products. Mold temperature to get lower, high mold temperature will reduce the transparency of products by crystallization. Glass fiber reinforced, its thermal deformation temperature is above 250 ℃.

it is widely used in chemical machinery, anti-corrosion equipment gear making bad material and parts. Wear parts, transmission parts, home appliance parts, automotive parts, wire rod to prevent the machine parts, chemical machinery parts, chemical equipment, etc.

nylon rods use

nylon rods with good toughness, abrasion resistance, oil resistance, strong anti-seismic, good tensile, bending strength, and has the characteristics of small water absorption, good dimensional stability, and is used for processing various wear-resistant high strength parts. Products, widely used in plastic instead of steel, iron, copper and other metal material, is an important engineering plastics; Cast nylon instead of mechanical equipment wear parts, instead of the copper and alloys for equipment wear resistance. Is suitable for making wear parts, transmission parts, home appliance parts, automotive parts, wire rod to prevent the machine parts, chemical machinery parts, chemical equipment. Such as turbine, gear, bearing, impeller, shaft, dashboard, drive shaft, valve, blades, wire rod, high pressure washers, screws, nuts, seals, shuttle, set of Jane, axle housing connector, etc.

this website: https://www. 国会议员, insulationpins。 com/news/626。 HTML keywords: nylon rods
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