The purpose of electroplating is to plate a metal coating on the substrate to change the surface properties or size of the substrate. Electroplating can enhance the corrosion resistance of metals, increase hardness, prevent abrasion, improve conductivity, smoothness, heat resistance and beautiful surface. Depending on the purpose of the coating and the electrochemical reaction between the coating and the substrate, the coating can be divided into many types. Coating material   ① Classification according to the purpose of the coating The coating usually has two uses, namely: to give or improve the surface condition of the material, or to make the surface structure of the material have a certain function. Therefore, it can be generally divided into decorative, protective coating or functional coating. 1. Protective decorative coating Corrosion, rust, etc. are the greatest threats to product life, which will not only damage the appearance, but also affect the function of the product. In addition to improving the appearance of the product, the general decorative coating can also play a protective role, such as chemical anti-corrosion and anti-rust, or mechanical anti-wear to reduce friction. 2. Functional coating Functional coating mainly refers to those coatings that can make the surface of the material have a special function. Various new functional coatings can increase the surface hardness of the material, improve friction, reduce wear, improve electrical conductivity, reduce contact resistance, enhance magnetism, prevent diffusion and penetration, or repair worn parts. ②. Classification according to the electrochemical relationship between the coating and the substrate According to the electrochemical relationship between the coating and the substrate, the coating can be divided into cathodic coating and anodic coating. The liveliness of the metal is different, which is also an important way to judge the type of coating. 1. Cathodic coating The metal substrate of the cathodic coating is more active than the coating. Such a coating usually covers the substrate completely to protect the substrate. The typical ones are copper plating and nickel plating on steel. Since the cathodic coating only has a certain thickness, it has a protective effect on the substrate. Therefore, the coating thickness and porosity are required. Usually, a coating thickness gauge is used to control the thickness of the coating. 2. Anode coating The plating metal of the anodic coating is more active than the substrate. When the coating encounters corrosive substances, the coating will corrode first, thereby protecting the substrate from corrosion. Typically, there is zinc plating on steel. The above is the plating classification knowledge organized by the editor. If you want to know the coating thickness measurement method and the coating thickness gauge product, please click "How to use the coating thickness gauge to measure the coating thickness" for details.

Low speed wire cut, also known as low-speed walking, uses continuous moving thin metal wires (called electrode wires, generally copper wires) as electrodes to perform pulsed spark discharge on the work piece, which generates high temperatures above 6000 degrees, etc. A CNC machining machine that becomes a work piece. The principle of slow wire processing is the phenomenon that there is a gap between the wire electrode and the work piece, and the electrical discharge is continuously removed. Walk slowly. Unlike CNC turning, which is suitable for processing Dowel Pins, Low speed wire cut is more suitable for irregular workpieces that require right-angle cutting. Since the Low speed wire cut machine adopts the method of continuous wire feeding of the wire electrode, that is, the wire electrode completes the processing during the movement, so even if the wire electrode is worn, it can be continuously supplemented, which can improve the processing accuracy of the part. The surface roughness of the work piece processed by the slow-feed wire cutting machine can usually reach Ra = 0.8 μm and above, and the roundness error, straight line error and dimensional error of the slow-feed wire cutting machine are much better than those of the fast-feed wire cutting machine. For high-precision parts, Low speed wire cut machines are widely used. In addition to early small and medium-sized enterprises, it is also very common in processing plants of large enterprises such as aviation, automotive, and medical. WORKING PRINCIPLE Jog wire is a machining machine that uses continuous moving thin metal wires (called electrode wires) as electrodes to perform pulse spark discharge on the work piece to remove metal and cut and form. Loose contact light pressure discharge between the wire electrode and the work piece during slow wire processing. When the flexible electrode wire and the work piece are close to the commonly considered discharge gap (for example, 8 to 10 μm), spark discharge does not occur. Even when the electrode wire has contacted the work piece and the gap is no longer visible from the microscope, it is often not visible. To the spark, a normal spark discharge occurs only when the work piece bends the electrode wire and deviates a certain distance (a few microns to several tens of microns). At this time, for each 1 μm of wire electrode feed, the discharge gap does not decrease by 1 μm, but the electrode wire increases a little tension between the wires, and the work piece increases a little lateral pressure. Obviously, only after maintaining a slight contact pressure between the electrode wire and the work piece In order to form a spark discharge. Based on this, it is believed that there is some kind of electrochemically generated insulating film medium between the electrode wire and the work piece Processing characteristics Surface Quality (1) Nanosecond high peak current pulse power technology In the EDM process, there are two types of metal erosion: meltin...

In the processing of parts, those small parts such as bars need to be processed at one time, and those parts need to be processed in batches. In most cases, it will be used. Pogo Pin, Brass Threaded Inserts for Plastic, 316 stainless steel dowel pins, small appliances shafts, brass cable connectors and other round symmetrical products fall into this range, as long as it involves the processing of rod-like parts, as long as the diameter of the processed part is not When the diameter is too large (the diameter cannot be greater than 52mm), the CNC lathe has great advantages in all aspects. If coupled with the matching equipment-feeder (CNC CNC PRECISION AUTOMATIC LATHE), it will generally be used for distribution. Can have a greater advantage), so in terms of this set of equipment, it is a relatively typical small automated production line, whether it is in the speed of processing parts, the molding rate of the product or the cost of the entire production, It has advantages unmatched by other machine tools. The biggest and most important difference between CNC PRECISION AUTOMATIC LATHE and the walking machine is that during the work of the walking machine, the knife moves while the workpiece does not move. CNC PRECISION AUTOMATIC LATHE has long been called a slitting machine in China. It is mainly used for batch processing of small rod-shaped parts. Most feeders pass the bar through the through hole of the spindle, and the collet is automatically clamped. If the parts that need to be processed in the processing process are protruding outward for a certain distance, then the parts need to be equipped with a tip. If the tail needs to be processed, a second spindle is required. If the machined parts need to be machined with four or six drill holes, then a power tool holder and spindle indexing are needed. For CNC PRECISION AUTOMATIC LATHE, the biggest limitation is the limitation of the rod material diameter. At present, the largest type of center lathe can only process parts with a diameter of 50 mm. As long as it is a part that can be machined by CNC PRECISION AUTOMATIC LATHE, its machining accuracy, machining speed, and cutting machine can't match it. There are a lot of CNC PRECISION AUTOMATIC LATHE, but its main advantage is that one time clamping of the part can cut the part up to 200mm in length without stopping the spindle. If you need to process a relatively small part (10mm), both CNC PRECISION AUTOMATIC LATHE and the cutter can be used, but CNC PRECISION AUTOMATIC LATHE can do a lot of this small part without stopping the spindle, but the cutter cannot . The cutting position of CNC PRECISION AUTOMATIC LATHE in the cutting process is always the nearest position where the part is fixed, so the rigidity is very good. The cutter can process more complex and irregular parts. For some flat plate seats that require grooves, the irregular and asymmetric CNC machining part cutter is more suitable than the CNC PRECISION AUTOMATIC LATHE. Zhonglida mach...

In the moving parts, the parts are worn due to long-term friction. When the clearance between the shaft and the hole wears to a certain extent, the parts must be replaced. Therefore, the designer chooses a lower hardness and better wear resistance when designing. The material is a shaft sleeve or a bushing, which can reduce the wear of the shaft and the seat. When the shaft sleeve or the bushing is worn to a certain extent, it can be replaced. This can save the cost of replacing the shaft or the seat. Generally, the bushing and the seat are used. Interference fit, and clearance fit with the shaft, because wear is unavoidable in any case, can only extend the life, and shaft parts are relatively easy to process; some new designers do not like this design, think that It is an increase in cost during manufacture, but after a period of use, it is still necessary to modify it in accordance with this method. However, the modification is likely to reduce the accuracy of the equipment. The reason is simple. Secondary processing cannot guarantee the position of the center of the seat hole. In addition, the bushing is used to replace rolling bearings (such as camshafts) in places with low speed, high radial load and high clearance requirements (actually, the bushing is also considered as a plain bearing). The material requires low hardness and resistance Grinding, the inner hole of the shaft sleeve can be ground and scraped to achieve high matching accuracy. There must be an oil groove on the inner wall. Lubrication of the shaft sleeve is very important. If dry grinding, the shaft and shaft sleeve will be scrapped quickly. Recommended here Scrap the inner hole wall of the sleeve during installation, which can leave many small pits and enhance lubrication 1. Plain bearing bushing generally function as sliding bearings. In order to save material, the wall thickness of the sleeve is designed according to the axial load required by the bearing. Generally, cast copper and bearing alloy materials are used. The shaft sleeve is divided into open and non-open, which depends on the needs of the structure. Generally, the sleeve cannot bear axial load, or can only bear small axial load. Or add thrust bearings. The shaft is generally round. 2.Bushings generally function as linings. The shaft can be of various shapes, as is the bushing. Bushings can be used to prevent corrosion, eliminate assembly gaps, etc. The shaft sleeve generally plays the role of axial positioning, and the end is in contact with the gear bearing and other parts under compressive stress. Sometimes the shaft must be matched with seals and other standard parts, and it is necessary to ensure that the middle part can pass through the shaft end. The shaft sleeve and seal ring can be made thin to ensure that the parts pass through. Plain bearing bushing have different uses in different occasions, can be axially positioned, can reduce friction and vibration, and can also be used to isolate the shaft from h...