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Plastic part quality monitoring method

A technology for quality monitoring and plastic parts, applied in related fields of plastic parts, can solve the problem of high cost

Inactive Publication Date: 2017-07-04
SAIC GENERAL MOTORS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Based on this, it is necessary to provide a quality monitoring method for plastic parts in view of the technical problem that the cost of the method for detecting chemical substances in plastics in the prior art is too high

Method used

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  • Plastic part quality monitoring method
  • Plastic part quality monitoring method
  • Plastic part quality monitoring method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0085] To check whether the grade of the fog lamp cover material (PP) of a certain vehicle model is consistent with the requirements in the drawing: (1) From documents such as the engineering drawings of the fog lamp cover, it is known that the PP material used for this part is Supplier A and the product grade is X's PP raw material. Take 0.5g of the material of this brand, and at the same time use a utility knife to cut 0.5g of the material of the automobile fog lamp cover plate to be tested, chop the two samples into plastic particles less than 0.005g, put them into sample bottles respectively, add methanol / 2.0 mL of the extract with a volume ratio of tetrahydrofuran of 1:1 was left to stand for 96 hours, and then mechanically shaken for 1.5 hours to obtain the extract of the material additive. (2) Pass the obtained two extracts through a 0.45 μm filter head, filter out the small particle impurities in the extract, and then dry them at 80°C for 20 minutes respectively, and ...

Embodiment 2

[0086] Best Embodiment 2: The steps of the quality monitoring method for plastic parts are as follows.

[0087] To check whether the grade of the material (ASA) of the exterior rearview mirror housing of a certain vehicle model is consistent with the requirements in the drawings: (1) According to documents such as the engineering drawings of the exterior rearview mirror, the ASA material used for this part is a product of supplier B ASA material whose brand is Y. Take 1.0g of the material of this grade, and at the same time use a utility knife to cut 1.0g of the material of the car exterior rearview mirror housing parts to be tested, chop the two samples into plastic particles less than 0.005g, put them into sample bottles, add 10mL of tetrahydrofuran was used as a solvent, and stood for 20 minutes to dissolve the materials and additives in the materials in the dissolving agent to form a polymer solution; then add 10mL of methanol as a precipitating agent to precipitate the po...

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Abstract

The invention discloses a plastic part quality monitoring method. The plastic part quality monitoring method comprises the following steps: obtaining an organic extract of a to-be-detected part as a to-be-detected extract, taking the obtained organic extract of the raw materials of a to-be-detected part nominal band as a nominal extract; performing Fourier transform infrared spectroscopy tests on the to-be-detected extract, taking the measured infrared spectrogram as the to-be-detected infrared spectrogram, performing the Fourier transform infrared spectroscopy test on the nominal extract, taking the measured infrared spectrogram as the nominal infrared spectrogram; if the to-be-detected infrared spectrogram and nominal infrared spectrogram are matched, the to-be-detected part and the raw materials of the nominal band are consistent, otherwise, the to-be-detected part and the raw materials of the nominal band are inconsistent. The plastic part quality monitoring method uses different characteristics of a product band formula of raw material suppliers for identifying the band of the materials of the part, can effectively monitor the problem of raw material replacing for the suppliers, and can realize the monitoring of the product quality.

Description

technical field [0001] The invention relates to the related technical field of plastic parts, in particular to a method for monitoring the quality of plastic parts. Background technique [0002] With the requirements of energy saving, emission reduction and light weight of automobiles, plastic products are more and more widely used in automobiles. In order to control the quality of injection molded parts, OEMs usually use the method of setting up a material approval list and approving the product grades of different raw material suppliers one by one according to the type of material to control the raw materials of injection molded parts. However, with the fierce competition in the automobile market, plastic parts suppliers are under increasing pressure on injection molding processing costs. Some plastic parts suppliers often deviate from the requirements of engineering drawings and reduce costs by replacing low-priced raw materials that are not approved by OEMs. Thereby inc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/3577
CPCG01N21/3577G01N2021/3595
Inventor 张晓晖王彩梅
Owner SAIC GENERAL MOTORS
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