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Working principle of slow wire processing

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 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...
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What are the rules for metal stamping die scrap tube?

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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...
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Introduction of KOVAR parts

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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...
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What are the requirements for the runners of die-casting molds?

cncmachining June 07, 2021

The runners of die-casting molds have corresponding requirements, so we need to understand these requirements as much as possible, which is of great help for us to use die-casting molds.

1. All molds should shorten the runner stroke as much as possible and reduce the cross-sectional area as much as possible on the premise of ensuring the forming quality. The cold slug hole is 1.5 times the diameter of the runner. All runners require cold slug holes, such as: below the mouth, The end of the runner, below the glue inlet of the fine nozzle, etc.

2. All fine nozzle molds, mold runners and nozzle hooks must be polished. It is necessary to ensure that the glue inlet is smooth, reduce the injection pressure and no residues are left on the product.https://ptjcnc.com

3. The flow channel section of the large nozzle mold should be round or up and down ellipse, that is, the height dimension is 0.5-1.0 larger than the width dimension and must be aligned before and after, and there should be no misalignment in polishing. In special circumstances, the unilateral flow path is required to be trapezoidal.

4. The inlet and nozzle positions should not be in the obvious appearance. The glue inlet point of the electroplating product should ensure the strength. The glue inlet point of the large nozzle and the product contact should be the knife edge surface with the smallest cross-sectional area to ensure that no residue remains after removal. Product.https://numerical-control.com/

5. The position of the thimble or hook pin for diving into the glue must be at a certain distance from the glue inlet of the parting surface, which is about 1.5 times the diameter of the runner, in order to ensure the toughness of the dive inlet. The diving gate must be polished.

6. The injection point of the large nozzle of the gear die is at the bottom of the tooth surface. Use a Φ1.0 milling cutter to align the tip of one of the teeth with a depth of 0.5-0.6, a width of 1.2, and a depth of 1.5, AB plate inserts. When inlaid through-holes are to be proceassed together, if through-holes are not inlaid, it is necessary to use the centering rod to center repeatedly to ensure concentric accuracy. The barrel needle of the rear mold is inserted into the front mold, and a drill bit smaller than the processing hole diameter must be used to make it thicker to facilitate the copper electric discharge machining.

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