Category: Manufacturing Technology knowledge

Casting is a kind of metal hot working technology that has been mastered by human beings for about 6000 years. China has entered the heyday of bronze castings between 1700 and 1000 BC, and the technology has reached a fairly high level. What are the common casting methods? What are their advantages and disadvantages? 1. Ordinary sand casting The basic raw materials for making sand mold are casting sand and molding sand binder. The most commonly used casting sand is siliceous sand. When the high temperature performance of silica sand cannot meet the requirements for use, zircon sand, chromite ore…

1、 General rules of knife path 1. Rough cutting Under the maximum load of the machine tool, in most cases, the largest knife, the largest feed amount and the fastest feed should be selected. In the case of the same knife, the feed is inversely proportional to the feed. In general, the load of the machine tool is not a problem. The principle of tool selection mainly depends on whether the two-dimensional angle and three-dimensional arc of the product are too small. After the tool is selected, the tool length is determined. The principle is that the tool length is…

At present, the most widely used welding equipment includes: welding rod arc welding, submerged arc welding, gas tungsten arc welding, plasma arc welding, gas metal arc welding, spot welding, seam welding, projection welding and butt welding. After a period of use, welding equipment will always fail for various reasons. At this time, the user must refer to the instruction manual of the welding equipment for comparative inspection and maintenance, that is, find and judge the cause according to the fault phenomenon. When the fault location is determined, it shall be repaired and replaced to solve the fault, so that the…

Cold, crack, shrinkage, gas and desquamation are the five major defects of aluminum alloy die casting 1、 Cold: rough roughness, cold lines, insufficient water, etc. on the casting surface. 2、 Cracks: refers to the tension cracks, top cracks, cold cracks due to too low mold temperature, and shrinkage cracks. 3、 Shrinkage: It refers to the casting surface is uneven and concave. 4、 Air: refers to air holes at the feed inlet of the casting, at the overflow slag ladle, on the surface of the casting, and inside the casting. 5、 Stripping: It means that there is a thin layer of…

Due to the complexity of NC processing (such as different machine tools, different materials, different tools, different cutting methods, different parameter settings, etc.), it must take a long time from engaging in NC processing (whether processing or programming) to reaching a certain level. This manual is summarized by engineers in the long-term actual production process A summary of experience in the selection of commonly used tool parameters and monitoring in the process of machining is available for your reference. 1、 Q: How to divide processing operations? Answer: NC processing procedures can be divided according to the following methods: (1) The…

The service life of NC punch die depends on reasonable die structure, high manufacturing accuracy, good heat treatment effect and correct selection of punch and installation accuracy of the punch. Besides, the correct use, maintenance and repair of the die can not be ignored. The following points should be noted: (1) Before the installation and use of the mold, it should be strictly checked to remove the dirt, and check whether the guide sleeve and mold of the mold are well lubricated. (2) Regularly check the rotary table of the press and the mold mounting base to ensure the coaxial…

Vibration analysis is a very important aspect of testing the performance of machining centers, but it is also a missing aspect at present. If this analysis has not been carried out on high-speed machine tools, the machine tool manufacturers may not know what the machine tools can do. In the process of milling, experienced machinists and NC programmers will react to the harsh and unpleasant sound caused by poor cutting conditions. This is due to the fact that the selected cutting parameters are not ideal enough. Facing this situation, they will reduce some parameters. In other words, they will lower…

Functions of hand model grinding: (1) Remove burrs, oil and dust on the surface of the substrate (2) Reduce the roughness of the workpiece surface: (3) Enhance the adhesion of the coating. 1. Manual grinding and polishing The efficiency is low, the labor intensity of workers is high, and the quality is unstable, but the use is most common. 2. Digital polishing machine Digital control, semi-automatic polishing, small size, easy to use, stable quality, good repeatability. 3. Ultrasonic polishing machine The edges and corners will not collapse after polishing, and the accuracy of the hand model will not be affected.…

Stainless Steel is the abbreviation of stainless steel and acid resistant steel. The steel that is resistant to weak corrosion media such as air, steam and water or has stainless property is called stainless steel; The steel resistant to chemical medium corrosion (acid, alkali, salt and other chemical etching) is called acid resistant steel. Due to the difference in chemical composition, their corrosion resistance is different. Ordinary stainless steel is generally not resistant to chemical medium corrosion, while acid resistant steel is generally stainless. Historical origin The invention and use of stainless steel can be traced back to the First…

1、 Indexable tool blade model compilation standard 1. Model representation rules of indexable turning tool GB ／ T5343.1, which is equivalent to ISO5680-1989. It is applicable to the model establishment of modular cutter heads for indexable cylindrical turning tools, end turning tools, anti profile turning tools and assembled composite tools. The model is also composed of a group of letters and numerical codes arranged in the specified order. 2. Model representation rules of indexable tools with holes It is based on ISO7406-1986. It is applicable to the compilation of models of indexable surface tools, three side edge (groove) tools, sleeve…