Automobile buckle insertion and extraction force and stress-strain test fixture

Abstract

The invention belongs to a positioning test fixture, and particularly relates to an automobile buckle insertion and extraction force and stress-strain test fixture. The test fixture comprises two parts including an insertion force fixture and an extraction force fixture corresponding to the insertion force fixture; the insertion force fixture comprises an insertion force fixture clamping block connected with a test machine, a first body, a second body, a third body, fixed sliding blocks and pressing circular plates; and the extraction force fixture comprises an extraction force fixture clamping block, an extraction force supporting assembly, a fixed baffle, a clamping device, a rotating knob and a clamping force adjusting round rod. The fixture is used during testing of stress-strain performance of an automobile buckle, and can clamp and position the buckle well during testing of the stress-strain of the automobile buckle, and slots in different models are formed in an H-shaped plate, so that buckles in various models can be tested. The test fixture is reasonable in structural design and convenient to operate; and the insertion and extraction force performance of plastic buckles can be tested accurately.

Description

technical field [0001] The invention belongs to a positioning test jig, in particular to a test jig for the insertion and withdrawal force and stress and strain of automobile buckles. Background technique [0002] At present, buckles are widely used in automobiles, such as door panel buckles, roof buckles, bumper buckles, floor buckles, weather strip buckles, seat buckles, etc. The buckle is not only convenient and fast to install, but also makes the car look more compact and lighter. Buckles play a very important role in fixing some positions and are easy to maintain, but car accidents often occur due to loose buckles, and brake failures often occur because the foot pads are not fixed properly. . When fixing the bumper of a car, it is often encountered that the number of buckles is insufficient, which leads to a decrease in the strength of the bumper, or the joint is cracked due to insufficient buckle strength. Many auto parts are connected by plastic buckles for installa...

AI Technical Summary

Problems solved by technology

[0005] Problems with this device: 1. The size of the opening of the U-shaped card slot is fixed, and it is impossible to test the insertion and withdrawal force of various specifications of the card, so the scope of use is limited.

2. The fixture is only connected to the dynamometer, and cannot record the stress-displacement curve during the test from time to time, and can only measure the maximum value

3. The U-shaped groove at the upper part of the fixture is free and unconstrained, and the rigidity is not enough. It is easy to deform during the test and affect the experimental results. 4. The device can only be used for the pull-out force test, and an additional test is required for the pull-out force test. device

[0007] The problem that this device exists: 1, there is only one direction to move on the guide rail, so just limited the size of the buckle test piece another direction, is unfavorable for the utilization of some irregular materials

2. There is no fixed device for the snap-on test piece on the slider, and it cannot be guaranteed that it will not slide and rotate in the laboratory, which will affect the experiment

3. In this experiment, the strength of some buckle test pieces is not strong enough, which increases the space on the test piece and causes the test piece to be pulled out, and the maximum tensile strength of the buckle cannot be truly measured.

[0008] Checking the relevant existing technical materials of snap-in fixtures, no related inventions have been found to test the snap-in and pull-out force of automobile snap-in insertion force fixtures. In the field of mechanical testing in my country, people pay little attention to fixtures, such as pulling Due to the lack of fixtures, the tensile testing machine cannot test the stress and strain of the buckle. This phenomenon is worthy of our attention.

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