The method to solve the rust problem of the Phillips screw is difficult to remove the phillips screw rust, the following are some solutions:
1. Wetting: Use rust remover or kerosene-soaked nut and unscrew after soaking.
2. Vibration: For rusty phillips screws, do not use a wrench to forcibly twist, so as not to damage the screw head or wrench. The handle of the wrench can be gently vibrated, usually to loosen rusty Phillips screws.
3. Knock: Use the edge of a square-topped hammer to knock the rusted nut to loosen it. For the bolts and nuts at both ends of the bicycle pedal, the cast iron can be knocked with greater force, and the plastic should be lightly knocked. If the knock still does not work, you can turn in the direction of the nut knock, often can easily remove the nut.
4. Barbecue + dripping oil: For seriously rusty phillips screws, the above method is still ineffective, you can use the "fire attack" method. Grill the screws and nuts thoroughly using a gas welding oxide flame, then drizzle with a little oil. The purpose of heating the phillips screw is to thermally expand it so that it is easier to remove. With the development of the industry, the demand for high-strength screws is increasing. However, in China, there are still some common problems with high-strength screws.
1. The load and contour load do not meet the requirements: The load and contour load are important indicators to evaluate the mechanical properties of the product under tensile load. It is especially important for high strength screws. If the index value is not in accordance with the specification, plastic deformation may occur, resulting in reduced preload and loosening of the connection. The shear load test is used to evaluate the compressive strength of bolt products and the joint strength of head rod. If the index does not meet the requirements, it may break or loosen when bearing a large load, especially when the impact load or the support point bears part of the load, resulting in connection failure or even safety accidents.
2. Insufficient strength: Strength is the main index to evaluate the mechanical properties of high-strength screws. dissimilarity
