Tensile testing machine purchase method
Dongguan Hongjin Instruments has been specializing in the production of tensile testing machines for 15 years, and summed up several important aspects that need to be paid attention to when purchasing tensile testing machines.
First of all, the selection should be close to the test material itself, and determine the model (single-column or double-column, large or small) required for the material itself. Taking the flexible packaging industry and film industry as an example, the universal material tensile testing machine is an indispensable testing instrument. By using it to test materials such as tensile strength, peel strength, puncture strength, tear strength, and elongation, it can be avoided Quality problems in production provide a reliable basis for mass production of products.
1. Capacity, test stroke, configuration
Different tension ranges and different force sensors are configured, resulting in different structures, which will directly affect the cost of the instrument. For general flexible packaging manufacturers, the pulling force range of 300 Newtons is sufficient.
According to the performance and requirements of the flexible packaging film to be tested, the stroke can be 600-800mm;
There are three options of intelligent configuration: host, computer, and printer. The microcomputer function can also directly print electronic receipts. In addition, it can also be equipped with ordinary computers. If it is equipped with a computer, the manufacturer needs to configure the professional testing software. With a computer, it is possible to carry out complex data analysis, such as generating test reports, data editing, local amplification, adjustable report forms, and statistical analysis of group styles.
2. Test items
Flexible packaging requires a multi-purpose tensile machine, that is, on the basis of different fixtures, it can be used for stretching, compression, bending, tearing, shearing, 180-degree peeling, 90-degree peeling test, three-point bending resistance, four-point bending resistance Wait.
3. Test speed
Some of the commercially available tensile machines are in the range of 30~400 mm/min, and some are in the range of 0.01~500 mm/min. The former generally uses the ordinary speed control system, the cost is low, and the roughness affects the accuracy. The latter uses a servo system, which is expensive and has high precision. For flexible packaging companies, the servo system is selected, and the speed regulation range of 0.01~500mm/min is ideal, which not only meets the accuracy requirements, but also the price is within a reasonable range. Note: The basic speed control system with a price of about 10,000 yuan, because the market price of servo motors is about 1,000 yuan per unit.
4. Measurement accuracy
Accuracy issues, including force measurement accuracy, speed accuracy, deformation accuracy, and displacement accuracy. These accuracy values of the Kington tensile testing machine can reach a maximum of plus or minus 0.3%. But for general manufacturers, 1% accuracy is enough. In addition, the force value resolution of the Kington tensile testing machine can reach 1/200,000.
5. Transmission
There are screw drive and rack drive. The former is expensive, used for high precision and has high test repeatability; the latter is cheap, used for low precision and low test repeatability. The flexible packaging tension machine is used frequently and requires high precision, so the screw drive should be selected. The lead screw plays a decisive role in the measurement of the tensile force accuracy. Generally, there are ball screws, trapezoidal screws, and general screws. Among them, the ball screw has the highest accuracy, but its performance can only be exerted by the operation of the computer servo system, and the price of the whole set is relatively expensive. Moreover, the ball screw is divided into domestic and imported, both of which are different in price and quality. very big.
6. Sensors
The main cost lies in the service life. The technology of sensor induction can generally be used for more than 100,000 times, which can be achieved by imported and domestic joint venture manufacturers. In addition, the sensor is also an important component that affects the test results. Relatively speaking, the domestic sensor is not high in accuracy and the quality is not as good as the imported one. Therefore, the manufacturer should be asked about this issue when purchasing.
7. Machine quality
The machine of the tensile testing machine is like the body of a car. It must meet the relevant requirements of the above six points. Just like a car, a Ferrari engine with a Chery body cannot be used.
Post time: May-26-2022