Manufacturing and technical requirements of spring leaf materials

As we all know, spring leaf is used in many different industries, and the technology of spring leaf is also improving. Now it is very popular in the market. The spring leaf can be used at high temperature and low temperature, but the spring leaf at high temperature is made of some high temperature resistant materials. Similarly, the spring leaf material used at low temperature should also have good low temperature toughness. So, do you know what materials are used in the spring leaf? Next, I'll talk about the material of spring leaf in detail. Now, let's learn some basic information about spring leaves first.

What are the leaves in spring?

It is easy to bend in one direction, that is, the plane with the least stiffness, but it has greater tensile stiffness and bending stiffness in the other direction. Therefore, the spring leaf is mainly used to test sensitive elements, elastic supports, positioning devices and other detailed positions in instruments or automation equipment. Generally, flat steel bars of brands such as phosphor bronze, tin bronze, 65mn, 55Si2Mn, 60Si2MnA, 55SiMnVB, 55SiMnMoV, 60CrMn, 302, 3 16 are selected for the spring pieces.

Spring leaf material

Flat steel strips such as phosphor bronze, tin bronze, 65mn, 55Si2Mn, 60Si2MnA, 55SiMnVB, 55SiMnMoV, 60CrMn, 302, 3 16. Optional for spring plate.

The spring leaf material working at high temperature requires good thermal stability, anti-relaxation or creep ability, anti-oxidation ability and resistance to certain medium corrosion. With the increase of working temperature of spring leaf, the elastic modulus of spring leaf material decreases, which leads to the decrease of stiffness and bearing capacity. Therefore, the spring working at high temperature must know the change rate (value) of elastic modulus. According to GB 1239, when the working temperature of ordinary spiral spring exceeds 60℃, the shear modulus should be corrected. The formula is: gt = elastic modulus at room temperature in KTG formula; The shear modulus t: Kt temperature correction coefficient at Gt working temperature is selected according to Table 2-98.

Spring leaf structure

Because there are many kinds of leaf springs, here Bian Xiao only takes the most common gas spring as an example. Its 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.

Buzzer is the most important structure of spring leaf, and it is also the most prone to problems in its production process. The key of chip tin plating is the tin plating of the middle positive lead. Because it is coated with ceramic powder, the electric soldering iron with too high power will burn ceramic powder when tinning, so the tinning time must be short, and at the same time, it must use a better solder wire, generally above 60℃. This kind of welding wire contains a lot of tin, so it will weld better.

Spring leaf model

GB/T 1239.2- 1989 cold-rolled cylindrical helical compression spring

GB/T 1239.3- 1989 cold-rolled cylindrical helical torsion spring

GB/T 1239.4- 1989 hot rolled cylindrical helical spring

Spring leaf action

1. The spring leaf is a magical part, which can store energy and has the functions of shock absorption, clamping and measurement. Its function of storing energy is to use the energy transformed by its deformation. In the car, its role is relatively large, the seat in the car has the participation of spring pieces, and the more important clutch, throttle and brake in the car all have the participation of spring pieces.

2. It also has the functions of compression, stretching and torsion. Therefore, in life, spring leaves can be divided into compression springs, tension springs, torsion springs and so on.

Technical requirements of spring leaf

1. After the spring leaf is formed, most of it should be bent. However, if the radius of curvature of the bending parts is relatively small, then these parts will produce great stress.

2. Spring leaves often have stepped parts and openings, and stress concentration will occur in the stepped parts with drastic size changes. The smaller the diameter of the hole, the larger the width of the plate and the greater the stress concentration coefficient.

3. The requirements of heat treatment of spring leaf should be put forward according to the performance requirements, and the hardness after heat treatment can generally be determined between 36-52 HRC.

Spring leaf making

1. Material selection. Material selection is an important link in making spring pieces. Generally speaking, it is required that the materials used to make spring plates have high elastic limit, fatigue limit, impact toughness and good heat treatment performance. Therefore, the commonly used spring leaf materials are carbon spring leaf, alloy spring leaf, stainless steel spring leaf, copper alloy and so on.

2. production. There are two kinds of spring pieces: cold-rolled and hot-rolled. Generally, the diameter of cold-rolled shrapnel wire is less than 8mm, and the diameter of hot-rolled shrapnel wire is greater than 8 mm. According to the properties of the selected materials, after selecting the manufacturing method, the spring leaf should be made into different types according to its application in different environments and functions.

3. Because of the different materials, some spring pieces should be pressed or shot blasted after cold rolling or hot rolling, so as to give full play to the role of spring pieces.