Category: Manufacturing Technology knowledge

Performance of tool breakage 1) Slight chipping of cutting edge When the structure, hardness and allowance of the workpiece material are uneven, and the front angle is too large, which leads to the low strength of the cutting edge, the insufficient rigidity of the process system generates vibration, or intermittent cutting, and the grinding quality is poor, the cutting edge is prone to micro collapse, that is, there is a small collapse, notch or peeling in the edge area. In this case, the tool will lose some of its cutting ability, but it can continue to work. During continuous cutting,…

A new process of induction heat treatment for crankshaft is introduced, which is different from the conventional process and does not rotate the crankshaft. Compared with the operation of traditional induction hardening equipment, this paper summarizes the technical advantages of this new static method, namely, saving cost and space. Crankshafts are widely used in internal combustion engines, pumps, compressors, etc., and belong to the most critical type of components, especially for engines with a mass between 15 and 40 kg. At the same time, the same is true for some crankshafts with a mass of more than 700kg (crankshafts for…

NC machining is the most widely used machining method at present, and it is also the basic skill that every machining worker must master. After starting up, workpiece clamping, workpiece touch count, tool preparation and processing parameter setting, the start up processing link is entered. What problems should operators pay attention to in this link? 1. Tool and feed speed Before executing each program, all tools must be carefully checked to ensure that they are consistent with the tools specified in the programming instructions. At the beginning of processing, the feed speed shall be adjusted to the minimum, and the…

Turbocharger is one of the important components of turbocharged diesel engine. It pressurizes the air from the air filter and increases the charge volume to improve the power of diesel. Due to the poor working environment of the supercharger, the supercharger is often replaced frequently due to ring damage and oil leakage. For example, the diesel engine on one T200 bulldozer of our company has replaced five turbochargers within one year, which makes the spare parts cost of the turbocharger alone for the bulldozer throughout the year reach 15,000 yuan. Because the cumulative downtime for replacing the turbocharger is 10…

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…