How the hottest plastic manufacturers choose the t

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How do plastic manufacturers choose testing machines (II)

single pillar or double pillar

the maximum load you generally need depends on the type of material you are testing, and it is one of the important issues to consider when deciding whether to choose a single pillar machine or a double pillar machine. Also consider whether an environmental compartment is needed for testing at a controlled temperature. The double pillar device is relatively high, which allows a larger sample and a larger heating cabinet to be inserted between the pillars. If you will carry out any compression test on foam, because the sample is often large, it usually needs a double strut device

the two pillar machine is also hard and solid by nature. Therefore, there is less deflection during the test. The last is the difference in cost. The price of a single pillar general-purpose testing machine may be only $7000 to $10000, while the price of a double pillar model usually ranges from $13500 to $30000. These prices are only for machines. The price of the load unit may range from $1500 to $5000. Data acquisition and analysis software may be worth $2500, excluding computers. Fixture is another separate cost, so is installation and training. If you need a heating chamber, it usually costs between $8000 and $20000

progress in software

the design of general-purpose testing machines in electromechanical aspects is relatively mature. The new progress is in control software. Advanced computer software provides higher productivity and accuracy, and is easier to use. These software have increased a certain degree of repeatability, which has never existed before

instead of relying solely on readings at the breaking point, designers and quality management managers can now find out what happened through testing. Did the material stretch or deform before fracture? Is its deformation proportional to the stress? Answers can help them evaluate materials, determine safety margins, and better simulate terminal use

the tester, load unit and connected computer are installed in a box with a flat touch screen display

the new software enables automatic testing, data collection, analysis, report output, data storage and recovery. The user can make the machine run at a certain load rate, and the system will automatically adjust the speed of the beam. The new software also enables users to obtain the true value of tension during the test process through the position sensor, which accurately measures the distance the beam has moved. The automatic strain result is obtained by dividing the length change of the specimen by its original length

the new software can also realize the automatic verification and calibration of the load unit of the screen and flashlight pool when replacing the sensor. It "reads" the electronic parts on the load unit and establishes the parameters, which no longer requires the mechanical correction previously completed by the operator

newer software with faster data acquisition can obtain the peak load more accurately, and check the tension/strain curve in more detail at higher speeds or when the load fluctuates. The typical data acquisition speed is about 50Hz (50 readings per second), although the sampling speed can reach 5KHz

the latest computer-driven general-purpose testing machines are cheaper than those with digital control boards that have been used for more than 10 years. The new type of computer has relatively simple control, and the digital display with chart reading is often not used. The computer-based general-purpose testing machine now drives the whole operation, because it does not need digital displays and some electronic components, so it can get the cost down

affordable dynamic testing

different from the Electromechanical General testing machine for static testing, the servo oil pressure general testing machine performs dynamic or fatigue testing. These tests must require constant force application in a cyclic action of load and release. For example, in the fatigue fracture development test, the user expects to determine how many cycles it takes for the material to fracture. Dynamic testing on electromechanical machines requires less force than static testing

the load capacity of servo hydraulic machines ranges from 100 pounds to tons, and the general price is two to three times that of electromechanical general-purpose testing machines. They are mainly used for fatigue testing of metals, but they are also increasingly used to test plastics for automotive, aviation, biochemical and electronic industries. In these fields, plastics have replaced metals in structural components that bear fatigue

the computer-driven servo electric universal testing machine is said to have the unique ability to carry out a series of low stress dynamic and static tests on materials and small components. Although these devices are expensive, they are more affordable than in the past. Compared with servo oil pressure drive, servo electric drive has the advantage of avoiding the use of hydraulic oil, pump and water cooling

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