The rubber tensile testing machine can do many different types of tests on rubber and other materials, such as tensile, peeling, shearing, and tearing tests, as well as cycle tests and control tests. It can automatically figure out the test load, test elongation, tensile strength, different constant tensile forces and stresses, elastic modulus, and other parameters based on GB, ASTM, ISO, and other standards. It is also used to test the strength of metal wire, metal sheets, plastic, composite materials, waterproof materials, paper, springs, fabric, yarn, wire, cable, and other things.
Rubber tensile testing machine’s price
There are different prices for single-living rubber tensile machines and double-column rubber tensile machines that are used to test the tensile strength of rubber. Depending on how the rubber tensile testing machine is set up, it may also have a digital display control, a computer control, or a microcomputer control.
Rubber tensile testing machines can be changed and made to fit the needs of their users by the company that makes them. The equipment can be used to test tensile strength, compression, bending, shearing, peeling, tearing, and other things. A rubber tension machine will usually cost between 350 and 5000 US dollars.
Things that affect how well rubber tensile machines test materials
The first thing to look at is the machine’s force sensor, which has a big effect on how well the machine works and how well it works.
The second part is the ball screw, which moves the sensor. If there is a gap, the test data made in the future will directly reflect the test’s maximum deformation and lengthening after breaking.
The third part of the rubber tension machine is the way it moves. Some rubber tension machines on the market use reducers for transmission, while others use regular belts. The main problems with these two transmission modes are that the first one needs to be oiled regularly and the second one can’t make sure the transmission is in sync, which affects the test results.
Then, the rubber tension machine’s power source, which is also called a motor. Some rubber tension machines on the market right now use regular three-phase motors or motors with a variable frequency. Analog signals are used to control this type of motor, which makes it hard to control and hard to place.
The last part is the machine’s measuring and controlling system (that is, software and hardware). Most measurement and control systems for tension machines on the market today are run by 8-bit single-chip microcomputers, which have a slow sampling rate and can’t block out noise very well.
How to choose a rubber tensile testing machine
Measurement factors
Can we purchase a rubber tensile testing machine to measure the following?
- The force value (breaking strength) when the sample breaks.
- The value of the force (tensile strength) that occurs during the tension on the specimen;
- Elongation at the break of the specimen (elongation at break).
- The force value when the sample is stretched to the specified elongation (constant tensile stress);
- Elongation when the specimen is stretched to the specified stress (constant stress elongation);
- Elongation relative to yield point (elongation at yield point);
- The stress value at the yield point (tensile stress at the yield point);
Use factors
In a rubber tensile test, there are two kinds of data that need to be kept track of: the tensile force value and the gauge change. The rubber tensile testing machine that is used to check how well rubber can be stretched must meet the following four conditions.
- Large stroke
When rubber is stretched, it changes shape a lot. This means that, especially in latex products, the elongation can reach more than 1,000%. Before the rubber sample breaks, the gripper must be able to move far enough.
- Data collection with a high level of accuracy and frequency
Rubber doesn’t need a lot of force to be stretched, and the measuring range of that force doesn’t need to be too large, so the force value is very accurate. In general, the testing machine needs a value for force that is accurate to within 2 digits of the decimal point. When testing the tensile properties of rubber, several tensile force values are needed, and the tensile test cannot be done more than once. So, how well and when the tensile force of each test section is written down is a very important part of whether or not the test is successful.
- The right tool for measuring and keeping track of gauges
The target distance of the sample is an important piece of information for figuring out how much the rubber will stretch. So, the tensile testing machine used in the rubber tensile test must measure the sample’s strain correctly and write it down right away.
- Tips on how to buy a tensile testing machine for rubber
First, you should think about the tensile strength range of the material to be tested. The different tension ranges determine the sensors that are used, which in turn determine the structure of the tension machine. However, this factor doesn’t have much of an effect on the price (except for the gantry type). The 100-Newton range is enough for most companies that make flexible packaging. Because of this, the single-arm type has also been chosen.
The structure that goes with the single arm type is called a “portal structure.” It can handle tensions of one ton or more, so flexible packaging manufacturers don’t really need it.
Test stroke’s problem
Type selection will be done based on the properties of the items that our company will test. For example, when testing items with a lot of stretch and a long length, the technical department of the manufacturer needs to be contacted before the tensile testing machine is ordered. Using flexible packaging film as an example, the performance and requirements to be tested can be measured between 600 and 1500 mm. If the material is stretched more than 100%, the stroke can be either 1000 or 1200 mm.
- Standard configuration problem
There are three basic ways that intelligence can be set up: the host, the microcomputer, and the printer. If the microcomputer has good features, it will be able to print right away.
If the car has a computer, the manufacturer must also include the right control system.
- Output results
The output of test results can be set to any of eight things: maximum force value; elongation; tensile strength; constant force elongation; constant elongation force value; yield strength; elastic modulus; and maximum test force.
How do I decide between a single-column and a double-column rubber-pulling machine?
Users need to decide if they want a single-column tensile machine or a double-column tensile machine based on their own needs. The test tensile force will be different for each type of material. Since the tensile testing machine can test many different kinds of materials, the fixtures that are needed will also be different. This is another important factor that affects the accuracy. Also, the force value of a rubber company’s tensile machine is usually around 5000 N.
You don’t need more than a single-column tensile machine. For some metal businesses, the value of the force they need will be quite high. At the moment, the only machine that can meet customer needs is the double column tensile machine. When the force value being tested is not very big, the user will still choose the cheaper single-column tension machine. In a word, they choose between a single column tension machine and a double column tension machine based on what they need.
Difference between a rubber tensile testing machine’s servo system and its frequency conversion system
Different things can be done with a frequency converter and a servo system because of how they work and what they do.
When it comes to controlling speed and torque, the requirements are not very high. Most of the time, a frequency converter is used, and the upper position plus the position feedback signal makes a closed loop. The frequency converter is used to control the position, but it is not very accurate and has a slow response time. At the moment, some frequency converters also accept the pulse sequence signal to control the speed, but it seems that they can’t directly control the position.
A servo system is the only way to control a position when it needs to be very precise. A servo system also has a much faster response time than a frequency conversion system. Servo control is also used when speed, accuracy, and response time are very important.
Almost any motion that can be controlled by changing the frequency can be done with a servo instead. Two things are important: first, the price of a servo system is much higher than that of a frequency conversion; and second, the reason for power: the maximum size of a frequency conversion can reach hundreds of kW or even more, while the maximum size of a servo system is only a few kW.
How to fix the rubber tensile testing machine’s force value and test speed?
What should we do if the rubber tension machine’s force value and speed are not correct during the test? After a while of using it, this will happen to a lot of people. They don’t know how to calibrate and aren’t sure if the test results are accurate. Here’s a simple way to check if something is true:
Open the correction interface after getting into the computer program. Take the standard fixture and hang it on the fixture connecting seat, starting from the test. Take note of the computer’s maximum force reading, and then let’s look at the weight of the weight. The difference between the force value shown on the computer and the weight can’t be more than 5 percent.
To check the speed of the rubber tension machine, you must record the initial stop position of the cross arm moving beam, stay at the integer position of the steel ruler, choose the speed value on the computer control panel, and set the rubber tension machine’s electronic stopwatch to count for one minute.
When the stopwatch’s time is up, press the stop button right away and use the recorded time to figure out the speed in minutes. Look at the difference between the cross-arm moving beam and the straight steel ruler in terms of how far they can move. The cross arm’s travel error value shouldn’t be more than 1%. If there is a problem with the tension machine’s speed or force value, the problem must be fixed by software.
How does the speed of the rubber tensile machine’s tensile force affect the test results?
A rubber tensile testing machine is a precise testing tool used to measure the mechanical properties, process properties, internal defects, tensile tests, compression, bending, and other tests of non-metallic materials like rubber, plastic, textile, and waterproof materials in different conditions and environments.
How does the speed at which the rubber tensile machine pulls on the rubber affect the test results?
Rubber is a viscoelastic material, and the speed of deformation has a lot to do with how the stress relaxes. When the speed of tensile deformation goes down, tensile strength goes down and elongation at break goes up. When the speed of tensile deformation goes up, the plastic gets more brittle, the tensile strength goes up, and the length at break goes down.
So, the tensile test must be done at the rate given in the standard test method. The main thing that the tensile speed, elongation after fracture, and yield strength of a rubber tensile machine depend on is the tensile speed. Different materials have different effects on the tensile speed testing machine. If not, the test results won’t be as accurate as they could be.
Tensile strength: As the test speed goes up, so does the tensile strength. But after a certain point, it tends to stay the same.
Yield Strength: When the test speed is slow, the difference between yield strength and tensile strength gradually decreases, and the elongation after breaking tends to decrease slowly after a certain point. Also, the tensile strength and elongation after a break in a material with high plasticity depend on how fast it is stretched.
Elongation after a break: As tensile speed goes up, the amount of elongation after a break goes down. At a certain point, the lengthening after a break tends to slow down. For example, you can see how quickly it bends if it has high plasticity. On the other hand, if you have low plasticity, you can see how quickly it bends less, which means it isn’t as sensitive to how fast you bend.