1. Steps where the shaft diameter changes greatly; poor round corners, fading grooves, etc. at the transition. In addition, if the surface is damaged, it is probably because the thread of the chrome-plated rod is not careful to damage the surface of the optical axis. It is probably because the surface roughness of the thread is too large, and the thread may be damaged if it is pressed for a long time.
2. Pull-off caused by overload. Because the toggle lever type depends on the deformation of the four tie rods to obtain the clamping force, if the length of the four tie rods is different, the deformation will be different. If one of the four tie rods is shorter, the shorter tie rod may greatly exceed its own capacity 1/4 clamping force, resulting in breakage.
3. During the application of the chrome-plated rod, due to the obvious temperature change, it will break. In fact, when the lengths of the four tie rods are different, the thermal stress caused by the sharp temperature rise or sag of the longer tie rod is constrained by the other three rods and is in an uncertain state, which will also cause the tie rod to break. .
Fourth, the chrome-plated rod may be deformed or broken due to compound strain. If the mold is not flat, the overall deviation of the parts such as the length of the connecting rod, the height of the circumference and the length of the tie rod is too large. When the connecting rod is straightened, the forces on both sides will be uneven. This will cause the rear template to swing and the tie rod to bend, and under the action of the bending stress and the tensile stress, the tie rod is easily broken.
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