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The disassembly of rolling bearing is one of the important disassembly contents in mechanical maintenance. Disassembly must follow the basic rules of bearing disassembly and assembly, and different disassembly tools and methods should be adopted for different bearings. When the bearing fits tightly with the shaft and loosely with the seat hole, the bearing and the shaft can be removed from the housing together, and then the bearing can be removed from the shaft with a press or other removal tools. Here are some common bearing disassembly methods: 1. Removal of inner / outer ring. Remove the outer ring of…

Shot blasting is to use the high-speed rotating impeller to throw out small steel shot or small iron shot and hit the surface of the part at high speed, so the oxide layer on the surface of the part can be removed. At the same time, steel shot or iron shot impacts the part surface at high speed, resulting in lattice distortion and deformation of the part surface and increasing the surface hardness. It is a method to clean the part surface. Shot blasting is often used to clean the casting surface or strengthen the part surface. Generally, shot blasting…

High speed machining (HSC), which emerged in the late 1980s, greatly shortens the machining time and improves the surface quality and machining accuracy of the workpiece because it significantly improves the cutting speed and feed speed. Therefore, it can reduce processing procedures and simplify production process, and promote the transformation of production mode in some industries, which effectively promotes the development of the whole production technology. High speed machining integrates the two contradictory characteristic parameters of "productivity" and "flexibility", so that the flexible production system composed of high-speed machining center can replace the traditional rigid automatic line, and promote the…

1. Basic requirements 1.1 the assembly must be carried out in accordance with the design, process requirements, this regulation and relevant standards. 1.2 the assembly environment must be clean. The assembly environment temperature, humidity, dust prevention, lighting and shockproof of high-precision products must comply with relevant regulations. 1.3 all parts (including purchased and outsourced parts) must have inspection certificates before assembly. 1.4 parts must be cleaned and cleaned before assembly, without burr, flash, scale, rust, chips, sand, dust and oil, and shall meet the corresponding cleanliness requirements. 1.5 parts shall not be bumped, scratched or rusted during assembly. 1.6 parts…

Based on the cold machining technology of material removal, since the United States used a single point diamond tool to process electrolytic copper in the early 1960s and successfully cut the mirror, qualitative changes have taken place in the machining accuracy, which promoted the emergence and development of ultra precision machining technology. It is generally believed that the machining technology with the size and shape position error of the machined parts less than a few tenths of a micron and the surface roughness between a few nanometers and a dozen nanometers is an ultra precision machining technology. At present, ultra…

The basic requirement for the cutting tool to be able to cut metal is that the cutting tool must be harder than the material to be cut, and the material to be cut must have enough force to be fixed, so that the tool can cut into the workpiece when applying force. After these requirements are met, the second is to have enough power to overcome the resistance of workpiece materials. In addition, the geometry of the tool will also affect the actual cutting effect and even the result. Choosing proper tool geometry can increase tool life, maintain machining accuracy,…

With the wide application of NC machine tools in production practice, NC programming has become one of the key problems in NC machining. In the process of NC programming, tools should be selected immediately in the state of human-computer interaction. Therefore, programmers must fully understand and master the cutting tools, so as to ensure the processing quality and efficiency of parts, give full play to the advantages of NC machine tools, and improve the economic benefits and production level of enterprises. Now let's talk about the tools commonly used in CNC. 1. Application of milling cutter Milling is the most…

The accuracy of the milling cutter can be compared with the accuracy of the measuring tool, so we should pay attention to and understand its correct use, in order to accurately install the milling cutter on the machine for milling. The clamping methods of milling cutter can be roughly divided into the following types: side fixed type, collet type, hydraulic type, tooth fixed type and heat shrinkable type. Side fixed Weldon It has extremely high holding force, so it is often used in heavy cutting occasions. It is suitable for heavy cutting of traditional machining methods or traditional machines. However,…

Many 3D printed metal parts need to be machined to produce precise surfaces, but 3D printed parts are often lightweight parts with complex geometry, which brings challenges to subsequent machining. When machining 3D printing parts, we need to consider a series of problems, such as whether the stiffness of 3D printing meets the requirements of machining, and how to clamp these complex 3D printing parts with fixtures. Through a 3D printing metal parts machining case shared by additive manufacturing experts, we jointly discuss the challenges and solutions in 3D printing parts machining. 3D printing is a flexible technology with less…

Due to the large thermal expansion coefficient of aluminum alloy parts, it is easy to deform in the process of thin-wall machining. Especially when using free forging blank, the machining allowance is large, and the deformation problem is more prominent. 1. Causes of machining deformation There are many reasons for the machining deformation of aluminum alloy parts, which are related to the material, part shape, production conditions and the performance of cutting fluid. It mainly includes the following aspects: deformation caused by internal stress of blank, deformation caused by cutting force and cutting heat, and deformation caused by clamping force.…