With the popularity of automobiles, more and more people are joining the auto repair industry, and it has a tendency to become a popular industry with potential. For those who want to enter the auto repair industry, learning leaf springs is a required course. So, today I will introduce to you the structure of leaf springs.
What is a spring leaf?
It is easy to bend in one direction, that is, the plane of minimum stiffness, but has greater tensile stiffness and bending stiffness in the other direction. Therefore, spring sheets are mainly used in sensitive components, elastic supports, positioning devices and other detailed locations in detection instruments or automatic devices. Generally, spring sheets are made of flat steel strips of phosphor bronze, tin bronze, 65mn, 55Si2Mn, 60Si2MnA, 55SiMnVB, 55SiMnMoV, 60CrMn, 60CrMnB, 302, 316 and other brands.
Technical requirements for spring blades
1. The radius of the bent part. When spring sheets are formed, most of them need to be bent. If the radius of curvature of the curved parts is relatively small, these parts will generate great stress. Therefore, if you want to avoid large stresses in the curved part, the bending radius should be designed so that it is at least five times the thickness of the plate.
2. Stress concentration at the notch or hole. Spring sheets often have stepped parts and openings. Stress concentration will occur at the steps where the size changes sharply. The smaller the diameter of the hole and the larger the plate width, the greater the stress concentration coefficient.
3. Spring leaf shape and size tolerance. Leaf springs are mostly processed by stamping. When designing, the shape and size suitable for stamping processing must be considered. At the same time, dimensional tolerances such as the spring rebound during bending and deformation during heat treatment must be fully considered.
Structural characteristics of spring blades
Since there are many types of spring blades, here I will only give examples of the most common and commonly used gas springs. The basic principle is to fill an oily mixture or inert gas with a certain pressure difference from the external atmospheric pressure, and then use the pressure difference on the cross section of the piston rod to complete the free movement of the gas spring.
The most important structure of the spring leaf, and also the most prone to problems during its production process, is the buzzer. The most critical thing about tin application on the chip is the tin application of the middle positive lead. Since it is coated with ceramic powder, a soldering iron with too much power will burn the ceramic powder when applying tin. Therefore, the tin application time must be long. Short, and at the same time, a better solder wire must be used, generally above 60°C. This kind of solder wire contains a large amount of tin and will have better fluidity during welding.
When it comes to spring blades, the editor has to mention springs that are closely related to spring blades. When installing this thing, you must pay attention to the balance between the left and right sides, otherwise it is easy for the left and right heights of the car to be unequal after installation.
How to make spring blades
1. Select materials. Material selection is an important step in making spring sheets. The materials used to make spring sheets are generally required to have high elastic limit, fatigue limit, impact toughness and good heat treatment properties. Therefore, the commonly used spring spring materials are carbon spring steel, alloy spring steel, stainless steel spring, copper alloy, etc.
2. Production. Spring sheets can be cold rolled and hot rolled. Generally, if the shrapnel diameter is less than 8mm, the cold rolling method is used, while if the diameter is larger than 8mm, the hot rolling method is used. According to the performance of the selected production materials and the production method, the spring sheets should be made into different types according to the application in different environments and functions.
3. Due to different materials, some spring sheets must be pressed or shot blasted after being made by cold rolling or hot rolling, so that the effect of the spring sheets can be maximized. of play.
Instructions for the application of spring blades
According to the characteristics of the material, it is used in actuating mechanisms in different environments. Spring blades are widely used in various contact devices, and the shape is most commonly used. The simplest straight cantilever leaf spring. The contact pads must have low resistance and are therefore made of bronze.
The function of the measuring leaf spring is to transform force or displacement. If the fixed structure and load-bearing method can ensure that the working length of the spring remains unchanged, the stiffness of the leaf spring is constant in the small deformation range. Nonlinear characteristics can also be obtained if necessary, such as pressing the spring on the limit plate or adjusting screw. , just change its working length.
Of course, there are now many private hand-made spring sheets, which are generally used to familiarize themselves with the structure, or used in gadgets for production purposes. If you are interested, you can also go to Baidu Tieba Look for relevant posts, maybe you will meet an expert. The above is the relevant information about the spring leaf structure summarized by the editor. I hope it can be helpful to you.