Category: Manufacturing Technology knowledge

The role of four types of stainless steel and alloy elements Stainless steels can be divided into four types: austenitic, martensitic, ferritic and duplex stainless steels (Table 1). This is based on the metallographic structure of stainless steel at room temperature. When low carbon steel is heated to 1550 ℉, its structure changes from ferrite phase at room temperature to austenite phase. When cooling, the microstructure of low carbon steel is transformed into ferrite again. The austenite structure at high temperature is nonmagnetic, and its strength is smaller and toughness is better than that of room temperature ferrite. When the…

1、 Broken wire 1. Poor discharge state - reduce the P value. If the P value decreases greatly and the wire is still broken, consider reducing the I value until the wire is continuous. This operation will reduce the processing efficiency. If the wire breaks frequently, please refer to the following contents to find out the root cause of the wire break. 2. The liquid flushing state is not good, and the upper and lower nozzles cannot be veneered, or the broken wire is usually located in the processing area during open machining—— Lower the P value and check whether…

1. Reasons for bolt breakage: 1. It is caused by the materials of bolts. If the materials we choose are better, then the quality of our bolts will be better. If the materials we choose are relatively poor, our bolts will break more to a certain extent. 2. The strength of the bolt is not high enough. If the pressure that the bolt is under is greater than the strength of the bolt, the bolt will easily break. Therefore, when using the bolt, we'd better understand the strength that the bolt can withstand, so that we can choose the bolt…

In today's manufacturing enterprises, many enterprises appear that BOM management lags behind the market requirements for enterprise production efficiency in production management, which makes it necessary to improve the scientific nature of enterprise production management by improving the management mode of BOM to meet the future needs. Through the investigation of manufacturing enterprises, this paper collects the difficulties encountered by BOM in enterprise management at present, puts forward the favorable factors brought to enterprises by using BOM modular management, gives the measures that enterprises need to take in the process of implementing BOM modularization, as well as the principles and…

1. A Simple Method to Check the Quality of Welding Rods (1) The inspection of actual welds is to inspect the quality of welding rods through the actual welding seams. For high-quality welding rods, the arc burning is extremely stable during welding, the welding core and coating are evenly melted, with little splash, the weld is well formed and easy to deslagging. (2) Strength inspection of coating: lift the welding rod one meter high and drop it freely on the smooth thick steel plate. If the coating does not fall off, it will prove that the coating strength meets the…

1. The highest stator voltage of the generator shall not be greater than (110%) of the rated voltage, and the lowest voltage shall generally not be lower than (90%) of the rated voltage, and shall meet the requirements of (plant) voltage. 2. The normal operating frequency of the generator shall be maintained at (50) Hz, and the allowable variation range is (± 0.2) Hz. The generator can operate continuously according to the rated capacity. When the frequency changes, the stator current, excitation current and temperature of each part shall not exceed (rated value). 3. The generator stator voltage is allowed…

Machining error refers to the degree of deviation between the actual geometric parameters (geometric size, geometric shape and mutual position) and the ideal geometric parameters of a part after processing. The degree of conformity between the actual geometric parameters and the ideal geometric parameters after part machining is the machining accuracy. The smaller the machining error and the higher the degree of conformity, the higher the machining accuracy. Machining accuracy and machining error are two ways to address the same problem. Therefore, the size of processing error reflects the level of processing accuracy. The main causes of machining errors are…

In the heat treatment process, the scrap rate caused by the quenching process is often high, which is mainly due to the large thermal stress and organizational stress formed at the same time during the quenching process. In addition, due to the inherent metallurgical defects of materials, improper material selection, wrong materials, poor structural and technological properties in design, defects formed during cold and hot processing, and other factors, they are easy to be exposed in the quenching and tempering process, so the quenching The defects after tempering must be systematically classified and inspected. Quenching defects and prevention The most…

The setting principles of safety protection devices are as follows: First, based on the plane on which the operator stands, all moving parts with a height of less than 2m shall be protected. Second, based on the plane on which the operator stands, if the height is more than 2m, there are material transmission devices, belt transmission devices and the lower part of the construction machinery, protection should be provided. Third, protection shall be provided at the operation position 2m above the falling height datum plane. Fourth, in order to avoid crushing injury, the distance between linear moving parts or…

1. What problems should be paid attention to when using new oil in the tank? Before pouring new oil, the quenching oil tank and cooling system must be carefully checked and cleaned. The remaining water, oil sludge and other dregs should be cleaned up. When adding new oil to the old oil tank system, the oil stain on the tank wall above the oil level in the quenching oil tank and on various frames should also be removed and cleaned. If the original oil residue and sludge are mixed with the new oil, the cooling characteristics of the oil may…