Slow wire walking, also called low-speed wire walking, is a kind of CNC machining machine tool that uses continuously moving fine metal wire as an electrode to pulse spark discharge on the workpiece to generate a high temperature of over 6000 degrees, ablate metal and cut into a workpiece. The principle of wire processing is the phenomenon that there is a gap between the wire electrode and the workpiece, and the metal is removed by continuous discharge. Since the slow-moving wire cutting machine adopts the method of wire electrode continuous feeding, that is, the wire electrode is processed during the movement, so even if the wire electrode is worn out, it can be continuously supplemented, so it can improve the machining accuracy of the parts and slow the wire. The surface roughness of the workpiece processed by the cutting machine can usually reach Ra=0.8μm and above, and the roundness error, linear error and dimensional error of the slow-moving wire cutting machine are much bett...
The Purpose Standardize the management of the scrapping of the company's metal stamping dies, prevent the loss of company assets, and formulate this system specially. Scope of application It is suitable for the management of the company's scrap molds. Definition If the molds listed in the assets of the company fall under one of the following circumstances, the use management department may apply for scrapping. 1. Molds that exceed the specified service life. 2. The mold is severely damaged by accidents or accidents, and molds that cannot be repaired or have no repair value. 3. Metal stamping dies that have not reached the service life, but due to safety, quality, efficiency and other issues, the repair still fails to meet the minimum requirements of the customer's product process or affects the production safety and efficiency. 4. Product customers have stopped placing orders or have not placed orders for molds in several years. 4. Responsibilities 1. Responsibilities of th...
KOVAR parts are commonly used as metal casing materials in the electronic packaging industry. Because they have a linear expansion coefficient close to that of molybdenum group glass, and can produce less sealing stress during the sealing (melting) process with molybdenum group glass, so To obtain good air-tightness, in order to make the metal tube and shell to achieve air-tight sealing, in the entire sealing process, the annealing process undoubtedly plays an important role as a link between the previous and the next. The internal stress generated during KOVAR machining also prepares the material structure for the implementation of the subsequent process-the sealing process of the metal parts. The main purpose of annealing Kovar shell before sealing is to: (1) Eliminate machining stress. When Kovar undergoes plastic machining deformation during cold working, about 10% to 15% of the applied energy is converted into internal energy, which is commonly referred to as internal stre...
The effect of coating thickness on surface and internal quality is the result of different coating thicknesses treated with different powers. Under the condition of constant coating thickness, the change of power has little effect on the quality of the cladding layer. When the power is the same, the surface quality and internal quality of the cladding layer will change greatly when the thickness of the coating is changed. When the power is in the range of 1.8kW～2.0kW and the coating thickness is 1mm～2mm, a good cladding layer can be obtained.
When the coating thickness is 3mm, continue to increase the laser power to change the quality of the cladding layer. However, in actual work, the power of the equipment cannot be increased indefinitely, and the thickness of the coating is not as thick as possible according to the working characteristics of the valve. In actual production, it should also be considered that after laser cladding, post-grinding should be carried out. Therefore, the appropriate thickness of the exhaust valve laser cladding coating is 2mm, which can not only meet the working conditions of the valve, but also ensure the stability of the process.
The influence of adhesive on the quality of the cladding layer During the pre-coating process of the valve, the adhesive has a significant influence on the quality of the cladding layer. The adhesive should firstly ensure good bonding performance and certain high temperature resistance, and there should be no splashing and peeling during the heating process. The adhesive must also be easy to volatilize, does not damage the performance of the cladding layer, is conducive to the formation of the cladding layer, and does not contain moisture.
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