Method for preparing bicycle frame from long-fiber reinforced thermoplastic composite material through on-line direct molding

A technology of composite materials and bicycle racks, which is applied to household components, household appliances, and other household appliances. It can solve the problems of low elastic rate and rigidity, large quality differences, and insufficient strength of aluminum, and achieve low cost, light weight, and Good impact resistance

Active Publication Date: 2011-05-25
HEFEI GENIUS NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Disadvantages of aluminum alloy frame: Since aluminum is a material with low elasticity and rigidity, thick pipes are used, or the shape is changed such as cross-over pipe, padded pipe, etc. In addition, aluminum alloy frame must be heat treated, otherwise the strength is not enough , while generally small-scale factories cannot afford to purchase heat treatment equipment
However, the quality of each manufacturer varies greatly, and some are very hard, so this kind of frame can only be known whether it is good or not after riding.
The disadvantage is: expensive, compared with titanium alloy, the price of carbon fiber frame is even worse, the price of the top carbon fiber frame is tens of thousands

Method used

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  • Method for preparing bicycle frame from long-fiber reinforced thermoplastic composite material through on-line direct molding
  • Method for preparing bicycle frame from long-fiber reinforced thermoplastic composite material through on-line direct molding

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] A kind of long fiber reinforced thermoplastic composite material online direct forming (LFT-D forming) manufactures the method for bicycle frame, manufacturing device such asfigure 1 As shown, the method includes the following steps:

[0036] (1) The processing temperature is controlled to be 230-250°C, and nylon 6 resin and additives are plasticized in the barrel of twin-screw extruder 3 at a weight ratio of 1:0.35, wherein the additives are antioxidants 1098 and 168, and The mixture of maleic anhydride grafted polypropylene and polyethylene wax as lubricant, the weight ratio is 1:1:5:1;

[0037] (2) The continuous glass fiber 1 is drawn out from the creel 2, and after being adjusted and dispersed by the tension roller, it is introduced into the barrel of the twin-screw extruder 3 from the middle section of the twin-screw extruder 3, and cut by the screw, the continuous glass fiber is uniform Mixed into the melt of nylon 6 resin, the weight ratio of continuous glass fi...

Embodiment 2

[0040] A kind of long fiber reinforced thermoplastic composite material on-line direct forming (LFT-D molding) manufactures the method for bicycle frame, and this method comprises the following steps:

[0041] (1) Control the processing temperature to 180-200°C, plasticize homopolypropylene resin and additives in the barrel of a twin-screw extruder at a weight ratio of 1:0.17, wherein the additives are antioxidants 1010 and 168, A mixture of compatibilizer glycidyl methacrylate and polypropylene copolymer, the weight ratio of which is 0.4:0.1:12;

[0042] (2) The continuous polyethylene terephthalate fiber is drawn out from the creel, and after the tension is adjusted and dispersed by the tension roller, it is introduced into the barrel of the twin-screw extruder from the middle section of the twin-screw extruder, cut by the screw, and continuously The polyethylene terephthalate fiber is evenly mixed into the homopolypropylene resin melt, and the weight ratio of the continuous...

Embodiment 3

[0045] A kind of long fiber reinforced thermoplastic composite material on-line direct forming (LFT-D molding) manufactures the method for bicycle frame, and this method comprises the following steps:

[0046] (1) The processing temperature is controlled to be 300-320°C, and the polycarbonate resin and additives are plasticized in the barrel of a twin-screw extruder at a weight ratio of 1:0.5, wherein the additives are antioxidants 1076 and 168, horse A mixture of toric anhydride grafted polyethylene and PE color masterbatch, the weight ratio of which is 0.1:0.3:10:20;

[0047] (2) The continuous stainless steel fiber is drawn from the creel, and after the tension is adjusted by the tension roller, it is introduced into the barrel of the twin-screw extruder from the middle section of the twin-screw extruder, and the continuous stainless steel fiber is evenly mixed into the polycarbonate by cutting the screw. In the resin melt, the weight ratio of the continuous stainless steel...

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Abstract

The invention relates to a method for preparing a bicycle frame from a long-fiber reinforced thermoplastic composite material through on-line direct molding. The method comprises the following steps of: plasticizing thermoplastic resin and an additive in a cylinder of a double-screw extruder by controlling processing temperature, drawing continuous fiber out from a creel, adjusting tension and leading into the cylinder of the double-screw extruder, uniformly mixing fiber into thermoplastic resin melt through cutting of a screw, and directly feeding thermoplastic resin melt mixed with the continuous fiber into a bicycle frame compacting tool set or pushing into a bicycle frame injection model and molding. Compared with the prior art, the method has the advantages that: mould pressing or injection molding can be directly performed, welding is not required, products prepared from the long-fiber reinforced thermoplastic composite material through on-line direct molding have the characteristics of high intensity, light weight, high impact resistance, low cost and the like.

Description

technical field [0001] The invention relates to a method for manufacturing a bicycle frame by molding composite materials, in particular to a method for manufacturing a bicycle frame by direct molding of long fiber reinforced thermoplastic composite materials on-line. Background technique [0002] Bicycle is a kind of commonly used means of transportation, how to produce safe, light, environment-friendly, cheap bicycle frame is an important issue that determines the development of this industry all the time. The materials used to make bicycle frames mainly include the following: [0003] Aluminum alloy (Al-Mg-Si, Al-Zn-Mg-(Cu)) [0004] Frames made of aluminum alloy have been around for a long time. Its lightness and low price are its advantages, but the reaction of old riders to it is that it is light but bendable. Although it has been improved many times, it still cannot overcome the shortcoming of Young's low modulus of elasticity. The latest aluminum alloy frame, in ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C43/02B29C43/34B29C45/00B29C45/18B29K105/08B29K105/06B29L31/30
Inventor 杨桂生
Owner HEFEI GENIUS NEW MATERIALS
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