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1、 Cause Analysis and Countermeasures of Rough and Medium Rolling Area Accidents 1. Steel stacking between racks after the rolled piece is bitten Failure cause: (1) The rolling speed and roll diameter are set incorrectly; (2) The tension setting after roll (groove) change is too small; (3) The steel temperature fluctuates too much; (4) The roll breaks suddenly; (5) The motor of a rolling mill suddenly speeds up or slows down due to the electric control system. Treatment measures: (1) Accurately set the rolling speed, roll diameter and tension; (2) Hold the temperature and wait for rolling, and notify the…

The manufacturing cell of a machine is a part, which is connected to form a machine through a certain form. And one of the connection forms between parts is screw connection, therefore, screw is often one of the most common structures on parts. The common methods for machining thread include turning, tapping and rolling, and tapping is the most widely used internal thread processing method. Especially for small size internal threads, tapping is almost the only processing method. There are generally two methods of tapping threads, namely, hand tapping and machine tapping. In order to facilitate thread processing, the following…

In recent ten years, the process operation of the blast furnace has changed greatly, especially the promotion of the coal injection process, but there is almost no change in the charge. Although there are some new methods to control the burden distribution, the actual burden is still composed of lump ore, sinter, pellets, coke and a small amount of flux. This article will explore the idea of using scrap steel cut into pieces as furnace charge. There are many possible advantages of adding scrap blocks to blast furnace burden. As the scrap is a fully reduced metal, it only needs…

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…