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How to choose a tensile testing machine

Nov 20, 2018

1.  consider the range of tensile force required to test the material.

The difference in the range of the tension determines the difference between the sensors used and the structure of the tension machine. For general flexible packaging manufacturers, a pull range of 100 Newtons is sufficient. Therefore, it is also decided to use a single arm type. Corresponding to the single-arm type is a gantry structure, which is adapted to a relatively large pulling force, such as one ton or more.

2.  the test strokeļ¼š

According to the performance and requirements of the flexible packaging film, the stroke can be 600-1500mm. For materials with an elongation of more than 1000%, a stroke of 1000 or 1200 mm can be used.

3. Standard configuration issues.

The three basic configurations of intelligent: host, microcomputer, and printer, if the microcomputer is powerful, you can print directly. It can also be equipped with a regular computer. With a computer, you can perform complex data analysis, such as data editing, partial magnification, adjustable report formats, and statistical analysis of groups. If equipped with a computer, the manufacturer should give the corresponding control system.

4. Output results.

The test result output can be arbitrarily set: maximum force value, elongation, tensile strength, constant strength elongation, constant elongation force value, yield strength, elastic modulus, and maximum test force. This can be said to be the most comprehensive result of the output when the microcomputer is operated.

5. Experimental project

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, and 90 degree peeling test. There are some high-end tensile machines on the market. In addition to the above items, the friction coefficient can also be tested because of the high precision of the sensors (some of which reach 350,000).

6.the main configuration of the product machinery:

Transmission, screw drive and rack drive, the former is expensive, high precision, high test repeatability; the latter is cheap, low precision, low test repeatability. The lead screw has a decisive effect on the measurement of the pull force accuracy. Generally there are ball screws, trapezoidal screws, and general screw. Among them, the ball screw has the highest accuracy, but its performance depends on the operation of the computer servo system, and the whole set price is relatively expensive. The precision required for flexible packaging, that is, 0.1-1% accuracy, can be achieved with a general lead screw and a lead screw. Transmission, geared and chain drive, the former is expensive for high precision; the latter is cheap for low precision. The main cost of the sensor lies in the life. Photoelectric induction is one of the more advanced technologies. Generally, it can be used more than 100,000 times. Imported and domestic joint ventures can achieve better technology. Jiangdu Tianyuan Testing Machinery Co., Ltd.

7.test speed.

Some of the market equipments are in the range of 10~500 mm/min, and some are in the range of 0.001~500 mm/min. The former generally uses the ordinary speed control system, the cost is lower, the roughness affects the accuracy; the latter uses the servo system, which is expensive and has high precision. For flexible packaging enterprises, the servo system is selected, and the speed range of 1~500mm/min is sufficient, so that the accuracy is not affected and the price is within a reasonable range.

8.measurement accuracy.

Accuracy issues, including force measurement accuracy, speed accuracy, deformation accuracy, and displacement accuracy. These precision values can be up to plus or minus 0.5. But for the average manufacturer, achieving 1% accuracy is sufficient. In addition, the force value resolution can almost reach a 400,000-point pull machine.