For friends who have been in contact with the radiator component industry, they often see or hear "CNC machining", but too much exposure does not necessarily mean that many people understand. In fact, many questions are still about CNC machining. What are the advantages? Let's take a closer look. CNC machining is an index-controlled machine tool machining, which is a method of using digital information to control the machining process. Traditional mechanical processing is done manually by machine tools. During processing, the mechanical cutter is shaken to cut metal, and the accuracy is measured with calipers and other tools. However, traditional artificial intelligence processing is far from being able to meet the needs of production development. Therefore, the emergence of CNC machining provides the possibility for the standardization, precision and efficiency of mechanical product processing. The CNC machining process in the radiator component industry also shines. The
How Do Cnc Swiss Machines Work Save 0 What Is Swiss Machine –The full name of the walking CNC lathe, it can also be called the spindle box mobile CNC automatic lathe, the economical turning and milling compound machine tool or the slitting lathe. It belongs to precision machining equipment, which can complete compound machining such as turning, milling, drilling, boring, tapping, and engraving at one time. It is mainly used for batch machining of precision hardware and special-shaped shafts. This machine tool first originated in Germany and Switzerland. In the early stage, it was mainly used for precision machining of military equipment. With the continuous development and expansion of industrialization, due to the urgent needs of the market, it was gradually applied to the machining of civilian products; the development of similar machine tools in Japan and South Korea Earlier than China, it was mainly used in the military industry in the early days. After the war, it was gradually
Spring Design Attention And Roll Forming Method The coiling characteristics and methods of springs are divided into cold coiling method and hot coiling method. Cold winding method: When the diameter of the spring wire is less than 8mm, the cold winding method is adopted. High-quality carbon spring steel wire is usually first cold drawn and then heat treated. After winding, it is generally not quenched, but only tempered at low temperature to eliminate the internal stress during winding. Hot-rolling method: Springs with larger diameter (>8mm) spring wire should use hot-rolling method. Hot rolled springs must be quenched and tempered at medium temperature. The Design Process Of Various Springs · Installation space: When designing a compression spring , it is necessary to have a clear understanding of the space required for the installation of the spring, in order to effectively grasp the basic manufacturing conditions of the compression spring, including the outer diam
Common welding methods for titanium and titanium alloys are as follows: Argon arc welding, submerged arc welding, vacuum electron beam welding, etc.
Tungsten argon arc welding is used for thicknesses of 3 mm or less, and argon arc welding is done for 3 mm or more. The purity of argon is over 99.99%, and the content of air and water vapor in argon is strictly controlled.
Currently, for TC4 titanium alloys, argon arc welding, plasma arc welding are often used for welding, but both methods need to be filled with welding material.
Limitations on shield gas, purity and effectiveness increase the oxygen content of the joint, reduce its strength and increase its post-weld deformation.
Electron beam welding and laser beam welding are used. The following is a description of precision welding and precautions for TC4 titanium alloy.
1. Weld hole problem
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Weld pores are the most common defect in welded titanium alloys, and the main causes of pores are hydrogen and oxygen present in the arc region of the metal to be welded. In electron beam welding of TC4 titanium alloy, there are almost no vent defects in the weld. To this end, the study focuses on process factors for the formation of pores in laser welds. Test results show that weld pores are closely related to the energy of the weld line during laser welding. If the weld line has moderate energy, there are very few or even no pores in the weld. If the line energy is too high or too low, it will cause serious pore defects in the weld. In addition, the presence of poor porosity in the weld is also related to the wall thickness of the weld. Comparing the test results of the samples, we can see that as the wall thickness of the weld increases, the probability of pores in the weld increases.
2, internal quality of welded part
Sample of titanium plate butt welding by electron beam welding and laser welding. Examine the internal quality of the weld. After testing, the internal quality of the weld has X-ray defects up to GB3233-87 Level II requirements. There are no cracks on the surface and inside of the weld, the appearance of the weld is well formed and the color is normal.
3. Weld depth and its variation
Titanium alloys are used as engineering components with specific requirements for weld depth. Otherwise, the component strength requirements cannot be met.
In addition, in order to realize precision welding, it is necessary to control fluctuations in welding depth. For this reason, two sets of butt test rings were welded by electron beam welding and laser welding, respectively. After welding, the test ring was analyzed in the vertical and horizontal directions to examine the variation in weld depth and weld depth. The results show that the average welding depth of electron beam welding reaches 2.70 mm or more. The range of variation in welding depth is -5.2 to + 6.0% and does not exceed ± 10%. The average welding depth of laser welding is about 2.70mm, and the welding depth varies from -3.8 to + 5.9% and does not exceed ± 10%.
4, joint deformation analysis
Butt test rings are used to inspect weld deformations at joints and detect radial and axial deformations of the butch test rings. The results show that the deformation of electron beam welding and laser welding is very small. Radial shrinkage deformation of electron beam welding is f 0.05 to f 0.09 mm, and axial shrinkage is 0.06 to 0.14 mm. The radial shrinkage deformation of laser welding is f 0.03 to f 0.10 mm, and the axial shrinkage deformation is 0.02 to 0.03 mm.
5, Titanium welding seam analysis
After chemical detection, the weld structure is a + b and the fine structure is columnar crystal + equiaxed crystal. A small amount of rasmartensite appears, the particle size is close to the matrix, the heat-affected zone is narrow, and the morphology and properties are ideal. After investigation, we can conclude that: For TC4 titanium alloys, whether laser welding or electron beam welding, the internal quality of the weld is a national standard as long as the process parameters are properly matched. GB3233-87II Welding requirements can be met. Achieves precision welding of TC4 titanium alloy. The appearance of the weld is well-formed and the color is normal. The welding height is low, and defects such as undercuts, dents, and surface cracks do not occur.
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