Category: Manufacturing Technology knowledge

EDM is an important process method of mold manufacturing, especially in plastic mold manufacturing. The cavity of plastic mold, many groove corners of sliding block, insert, inclined pin and other parts need EDM. Because EDM is a process method with slow processing speed, EDM needs to spend more man hours in mold manufacturing. How to improve the machining speed of EDM machine tools on the premise of ensuring the machining quality through effective and feasible process measures, and how to shorten the mold manufacturing cycle and reduce the mold manufacturing cost by relying on high-efficiency EDM production has always been…

Thermit welding: during welding, the ends of the two workpieces to be welded are fixed in the mold in advance, and then the mixture of aluminum powder and iron oxide powder (called thermite) is heated in the crucible to make it undergo reduction exothermic reaction to become liquid metal (iron) and slag (mainly Al2O3) and injected into the mold. The liquid metal flows into the gap of the joint to form the weld metal, and the slag floats on the surface. Sand mold casting: a casting method for generating castings in sand mold. Basic raw materials: casting sand and molding…

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,…