Category: Manufacturing Technology knowledge

Welding: also known as fusion, fusion is a manufacturing process and technology that joins metals or other thermoplastic materials such as plastics by heating, high temperature or high pressure. Welding classification: a. Fusion welding: Using a certain heat source, the connected part of the component is locally melted into liquid, and then cooled and crystallized into one, which is called fusion welding. b. Pressure welding: Using physical effects such as friction, diffusion and pressurization to overcome the unevenness of the two connecting surfaces and remove oxide film and other pollutants is a method that the atoms on the two connecting…

3、 Machining Machining: it refers to the machining process in which the thickness of excess metal layer is directly cut off on the blank with a tool in the production process of parts, so as to meet the technical requirements of dimensional accuracy, mutual accuracy of shape and position, surface quality and so on. Common machining methods: Turning, milling, planing, drilling, boring, grinding, gear machining, NC machining.

2、 Plastic forming Plastic forming: it is a process method of less cutting or no cutting by using the plasticity of materials and under the action of external forces of tools and molds. It has many kinds, mainly including forging, rolling, extrusion, drawing, stamping and so on.  (1) Forging Forging: it is a processing method that uses forging machinery to exert pressure on metal blank to produce plastic deformation, so as to obtain forgings with certain mechanical properties, certain shape and size. According to the forming mechanism, forging can be divided into free forging, die forging, ring grinding and special…

Material forming method is not only an important content of part design, but also an issue of great concern to manufacturers, but also a key factor in the process of material processing. Today, Xiaobian will take you to see various forming processes of metal materials. 1、 Casting The production method of pouring liquid metal into the mold cavity corresponding to the shape and size of the part and waiting for it to cool and solidify to obtain the blank or part is usually called metal liquid forming or casting. Process flow: liquid metal → mold filling → solidification shrinkage →…

1、 Problem summary: With the progress of manufacturing industry, NC machining has gradually dominated the traditional machining, and the demand for employees' understanding and understanding of special machining is also increasing. For NC technology, we can easily understand it as computer control principle, but we have less understanding of EDM technology. It is necessary to discuss NC machining equipment with you and understand the pillar of future industrial achievements. Traditional machining has a long history. It has played a great role in human production technology and material civilization. However, with the progress of human science and technology, complex process production…

CNC machining, also known as NC machining, refers to the machining with NC machining tools. Because NC machining is controlled by computer after programming, CNC machining has the advantages of stable machining quality, high machining precision, high repetition precision, complex surface machining and high machining efficiency. In the actual processing process, human factors and operation experience will affect the final processing quality to a great extent. Next, let's take a look at the twelve valuable experiences summarized by an old driver with ten years of CNC processing experience 1、 How to divide processing operations? The division of NC machining processes…

Introduction: The traditional thread processing methods are: the external thread is turned with thread turning tool, and the thread contour can be cut out only after multiple tool walks, which leads to low production efficiency; The internal thread is tapped with a tap. When working, the bottom hole of the thread must be processed first, and then the tool shall be changed for processing. The auxiliary time is long. With the development of NC technology, the machining method of NC milling thread has gradually replaced the traditional thread machining method. Compared with traditional thread milling methods, the efficiency and accuracy…

1. Density and relative density Density refers to the mass contained in the unit volume of a substance. The unit is milligram / m3 (mg / m3) or kilogram / m3 (kg / m3) or gram / cm3 (g / cm3). Relative density refers to the ratio of the density of a substance to the density of a reference substance under their respective specified conditions. The symbol is D, dimensionless. The general reference material is air or water: when air is used as the reference material, the density of dry air under the standard state (0 ℃ and 101.325kpa) is…

1、 Concept of surface roughness Surface roughness refers to the roughness of the machined surface with small spacing and small peaks and valleys. The distance (wave distance) between two wave peaks or two wave valleys is very small (below 1mm), which belongs to micro geometric error. Specifically, it refers to the height and spacing (s) of micro peak and valley (z). Generally, it is divided according to s: s ＜ 1mm is the surface roughness; 1 ≤ s ≤ 10mm refers to waviness; S > 10mm is F shape. 2、 Comparison table of vdi3400, RA and Rmax The national standard…

The geometric characteristics of machined surface include surface roughness, surface waviness and surface processing texture. Surface roughness is the basic unit of geometric features of machined surface. When machining the workpiece surface with metal cutting tools, the surface roughness is mainly affected by geometric factors, physical factors and machining process factors. 1. Geometric factors: From the perspective of geometry, the shape and geometric angle of the tool, especially the arc radius of the tool tip, the main deflection angle, the auxiliary deflection angle and the feed rate in the cutting parameters, have a great influence on the surface roughness. 2.…