In view of the above reasons for slippage caused by human factors and device factors, Shanghai and Sheng Instrument Technology Co.,Ltd. have formulated the following countermeasures, through the implementation of the countermeasures, the slipping phenomenon of the tenter can be reduced or eliminated.
1. Standardize the operating procedures of the testing machine /p
According to the short span length of the pattern and the selection of the clamping jaws of the clamping device Inappropriate, the following must be specified in the operating procedure of the electronic tensile testing machine: The clamping length of the tensile specimen must not be less than the length of the tooth surface of the clamping deviceand It is not permitted to use the jaws used for large sections to clamp small section specimens. Use specimens or flat collets to hold large specimens. Operators must perform tests according to operating procedures.
2. Fix the wedge-shaped tilt
Plastic deformation and valgus of the wedge-shaped block what leads to the slope of the wedge-shaped block collapsing or wear should be repaired. In general, the following two methods can be used to repair:
2.1,Repair WeldRepair the weld on the collapsed or worn part of the wedge shaped block slope and restore it then restore with a slotting machine (if the machining cannot meet the roughness requirements, you should also scrape and grind).The hardness and strength of repaired welded parts will generally increase, and it is enough to pay attention to the correct use of jigs in the future .
Using a slotting machine, remove 10mm of the wedge block's inclined plane according to the original design angle, and then place a polished, quenched steel plate on this Thurry This method somewhat weakens the structural strength of the lamp body, but has long-term effects. Better.
2.3 Add a defense layer over the wedge device
To prevent the metal sample from expanding When the oxide skin into the slope of the wedge falls, two rubber blocks can be installed on the top of the wedge, which can effectively reduce the fall of the oxide layer on the slope. In addition, butter or grease can be applied to the slope of the wedge, and the fixture should be regularly scrubbed and the oil
Summary of Electronic Tensile Tester Slippage
The electronic tensile testing machine slipped during the tensile test. The probability is still relatively high, mainly due to factors such as a Slippage of the specimen clamping part or a large gap between certain force value transmission links of the testing machine. The stretch value of the previous test using the testing machine was normal, but the stretch value of the current test will be obviously low, and the phenomenon is particularly obvious when some harder or brittle materials are tested .In general, the slip of the testing machine should be considered first.At this time, it is necessary to timely analyze the cause of the slip and take appropriate measures to ensure the accuracy of our test data.