Scope of application:

Actively test the wear resistance of smooth and corrugated plastic trim parts in interior and exterior trim parts

The scratch-resistant tester is suitable for various automotive interior materials, such as plastics, rubber, leather, fabrics, coated materials, non-coated materials and other composite materials. The wear resistance instrument that actively tests the smooth and corrugated plastic trim parts in the interior and exterior trim parts of the automobile is composed of two scraping devices. The left half can be used for five-finger/plastic finger scraping test, and the right half can be used for bagel scraping test. They share a reciprocating moving platform. This instrument can meet various test standards, and can customize the motion travel, speed and reciprocating period of the test platform according to customer requirements.

Principle of scraping:

The multi-functional scratch resistance tester for automobile interior decoration is applicable to various kinds of automobile interior material scratch performance test instrument, instrument integration of three domestic test standards (five finger scratch method, 100 grid method, plastic scratch finger scratch method). This test method is used to test the ability of surface material to resist damage caused by scratch. According to the nails or other hard objects that may be contacted in the use of materials, the scraping fingers of different materials shall be applied to the surface of samples under certain pressure in accordance with the specified direction, stroke and speed. The scraping head and samples shall move relatively, generating one-way and non-reciprocating linear scraping track, and the scratches shall be parallel to each other. Zui finally evaluates the material's scratch sensory grade, the color difference between the scraped and unscraped areas, or the zui minor scratch force when the sample surface is damaged. The instrument consists of a motor drive mechanism, a scraping component, and a sample clamping fixture. The scraping assembly includes scraping bracket, scraping finger, scraping designated position sleeve, pressurizing device (weight and weight support bar), etc. The instrument can be freely installed, replaced and disassembled with different sizes of scraping fingers, and can carry out uniform unidirectional linear scraping movement under different loads. The instrument adopts embedded system and man-machine interface operation to automate the test process, and adopts precise servo motor and ball screw drive, which plays a decisive role in the accuracy of scraping speed control under relevant standards. Tungsten carbide material is used as scratching finger to increase the applicable life of the instrument. The instrument is made of aluminum alloy and stainless steel with simple and light appearance and corrosion resistance.

Applicable standards:

GB/T 2918 standard environment for state control and testing of plastic specimens

GB/T 6151 color fastness test general rules

Calculation of color difference of GB/T 8424.3 color fastness test

PV3952 Volkswagen scratch resistance test method

GS97034 automotive interior material surface test, etc

Technical parameters:

1. Travel range: 10-200mm

2. Speed range: 10-200mm/s

3. Speed buffer: 10±1mm

4. Diameter of metal scraping head: 0.5mm, 0.75mm, 1mm (Erichsen318), 3mm, 5mm, 7mm

5. Metal scratch head material: tungsten carbide USES tungsten carbide as the scratch finger to accurately detect the surface wear that is damaged by unconventional defined physical forms (such as scraping, scratching, gouging, etc.).

6. Total weight of pressurized weight and scraping component: 2N, 3N, 5N, 7N, 8N, 10N, 12N, 15N, 20N (optional) the mass error is no more than 1%

7. Plastic finger scraping: polymethyl methacrylate (PMMA) diameter 16mm thickness 1mm finger scraping edge radius 0.5mm hardness shore D852

8. External dimension: 770×550×500mm

Weight: 50Kg

10. AC220V±10% 50Hz

Based on automotive industry standards and technical requirements

The test sample is fixed on a test platform driven by compressed air. The fingers of five independent shaft rods, which can be changed with different weights and optional fingers, act vertically on the surface of the test sample. The scraping finger is mounted on a hard bench, and the operator can fix the designated scraping finger in the balance position through the bracket, thus making the sample with irregular width can be tested.

In addition to material and product development, it also applies to quality control

Design of five-finger scratch/scratch tester

It's for plastic material evaluation. Hard materials wear-resistant, paint, ink, soft metal, linoleum and other materials testing.

Five finger test principle

5 fingers/plastic fingers scraping test: the sample on the test platform contacts five fingers or one plastic finger and the weight applied above it. During the test, the test platform moves and scratches are left on the surface of the sample. According to the depth of scratch to judge the scratch resistance of the sample. The samples may be plastic plates, test plates coated with paint and varnish, etc.

Bagel scraping test: the purpose of the test is to test the resistance of paint to mark shedding. The common bagel method is manual test, which takes time and effort to operate. The instrument is driven by two motors to control the length of scratches and the distance between scratches. Reciprocating motion process is: the first stage test, mobile platform movement (half a circle) at a time, cylinder scraping refers to lift, motor drive the scraping refers to the longitudinal mobile distance, cylinder scraping refers to put down, and then moving platform movement (half a circle) at a time, cylinder scraping refers to lift, motor drive the scraping refers to the longitudinal mobile distance again, and again. After marking the specified number of bars, manually rotate the test board 90 degrees to complete the second phase of the test. This instrument can realize the delimited interval 2.0 MMM, meeting the requirements of the standard

FIG. 1. Detail diagram of the layout when the scratch spacing is 2mm

Test standard

This multi-functional wear tester meets the following standards:

GS 97034-2

FORD FLTM BN 108-13

GMW 14698 (B)

GM 14688 (A)

GM 14688 (B)

PV 3952

FORD FLTM BN 108-13

GMW 14698 (B)

Mr BO - 162-01

GMN 3943

Nissan NES M0159

An instrument