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Plastic gear and manufacturing method thereof

A technology for plastic gears and manufacturing methods, applied in belts/chains/gears, components with teeth, portable lifting devices, etc., can solve the problems of low strength, poor toughness, and products are prone to whitening, and improve production efficiency. , The effect of reducing production cost and stable product quality

Active Publication Date: 2012-06-27
ANHUI APPROPRIATE WANFENG ELECTRIC APPLIANCE
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to alleviate the deficiencies and defects of the prior art, the object of the present invention is to provide a plastic gear and its manufacturing method. The present invention solves the problem that the injection-molded plastic gear is prone to whitening, fracture, poor toughness, and low strength during molding. And other physical performance defects, at the same time, the injection molding process is stable, the product quality is stable, the production efficiency is improved, and the production cost is reduced

Method used

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  • Plastic gear and manufacturing method thereof
  • Plastic gear and manufacturing method thereof

Examples

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Embodiment 1

[0027] Example 1: Plastic gears, whose raw materials include composition A and composition B, said composition A: 45 parts of nylon 66 and 45 parts of nylon 66+30% GF; composition B: 40 parts of glass fiber, phenolic 5 parts of resin, 5 parts of polymethyl methacrylate, 15 parts of nano calcium carbonate, 3 parts of organic silicon, 5 parts of polytetrafluoroethylene, 5 parts of paraffin, 3 parts of organic carbon, 5 parts of attapulgite and diatoms 2 parts of soil.

[0028] The manufacturing method of plastic gear, comprises the following steps:

[0029] (1) After mixing nylon 66 and nylon 66+30% GF raw materials, carry out drying treatment. The drying temperature is 100-120°C, and the drying time is 4-6 hours. Under drying for 24-28h;

[0030] (2) Weigh each raw material according to the weight part of composition B raw material, carry out drying treatment, the drying temperature is 120-150 ℃, the drying time is 3-5 hours, mix well, add into the dryer, at 140-160 ℃ Dry fo...

Embodiment 2

[0037] Embodiment 2: plastic gear, its constituent raw materials include composition A and composition B, described composition A: nylon 66 55 parts and nylon 66+30% GF 55 parts; Composition B: glass fiber 50 parts, phenolic 10 parts of resin, 10 parts of polymethyl methacrylate, 25 parts of nano calcium carbonate, 5 parts of silicone, 15 parts of polytetrafluoroethylene, 10 parts of paraffin, 5 parts of organic carbon, 10 parts of attapulgite and diatoms 3 parts of soil.

[0038] The manufacturing method of plastic gear, comprises the following steps:

[0039] (1) After mixing nylon 66 and nylon 66+30% GF raw materials, carry out drying treatment. The drying temperature is 100-120°C, and the drying time is 4-6 hours. Under drying for 24-28h;

[0040] (2) Weigh each raw material according to the weight part of composition B raw material, carry out drying treatment, the drying temperature is 120-150 ℃, the drying time is 3-5 hours, mix well, add into the dryer, at 140-160 ℃ ...

Embodiment 3

[0050] The plastic gear comprises the following parts by weight of raw materials: 45-55 parts of nylon 66 and 45-55 parts of nylon 66+30% GF.

[0051] A manufacturing method comprising the steps of:

[0052] (1) After mixing nylon 66 and nylon 66+30% GF raw materials, carry out drying treatment. The drying temperature is 100-120°C, and the drying time is 4-6 hours. Under drying for 24-28h;

[0053] (2) Mix the dried step (1) materials and send them into the injection molding machine;

[0054] (3) Set the temperature of the heating section of the injection molding machine: the first section is 290±5°C, the second section is 285±5°C, the third section is 280±5°C, the fourth section is 275±5°C, and the fifth section is 260±5°C ;

[0055] (4) Injection molding process parameters:

[0056] a. The first section adopts medium pressure of 65-70Mpa and low speed injection of 40-50m / s, the injection time is 1.0-1.5 seconds, and the amount of glue injected is 78-80% of the product; ...

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Abstract

The invention discloses a plastic gear and a manufacturing method thereof. The manufacturing method mainly comprises the steps of: adding dried and proportioned raw materials to a heated injection molding machine, and setting injection pressure, speed, injection time and injection amount of the injection molding machine at different stages as well as final pressure-maintaining pressure and speed to achieve an optimal injection molding process, so as to obtain a final qualified product. According to the invention, the defects of physical properties of easiness in whitening and breaking, poor toughness, low strength and the like of the injection-molded plastic gear during molding are overcome; and at the same time, the injection molding process is stable, the obtained product is stable in quality, the production efficiency is improved, and the production cost is lowered.

Description

Background technique [0001] The invention relates to a plastic gear and a manufacturing method thereof, belonging to the technical field of mechanical manufacturing. Background technique [0002] Plastic plastic gears are developing towards larger sizes, more complex geometries, and higher strength. At the same time, high-performance resins and long glass fiber-filled composite materials have played an important role in promoting plastic plastic gears in the past 50 years. Over the years, they have gone through a process of change from new materials to important industrial materials, and today they have penetrated into many different applications, such as automobiles, watches, sewing machines, structural control facilities and missiles, etc., to transmit torque and form of motion role. [0003] More advanced plastic plastic gear molding methods are being developed, such as two-injection molding, by designing an elastic body between the axle and the teeth, so that the plasti...

Claims

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Application Information

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IPC IPC(8): C08L77/06F16H55/06C08K7/14B29C45/00B29C45/76B29B13/06C08L27/18C08L61/06C08L33/12C08K13/04C08K3/26C08K3/34
Inventor 吴康希仇珍芳章云金川人邵登
Owner ANHUI APPROPRIATE WANFENG ELECTRIC APPLIANCE
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