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Sep 06 2023
Crane Slew Rings: Essential Components for Crane Rotation Control
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Spikes usually occur on the surface of metal or non-metal parts during processing, and also on bushings. For example, during the production process of slewing bearing, some parts may have spikes, which are likely to affect the installation, inspection, performance indicators and service life of rolling bearings. Especially the spikes produced on hydraulic seals or bushings can cause poor operation of the sliding bearing, thermal blocking, oil leakage, etc. How to remove the spikes on slewing bearing?
Electrolysis is to use electromagnetic energy to chemically melt the anodic oxidation to remove the spikes. According to the rolling bearing, the anodizing is coupled with the positive and negative of the power supply, and a dedicated tool that is negatively coupled to the negative pole of the power supply is maintained between the two aspects to allow the electrolytic current to flow. When the anode and the immersing liquid are subjected to AC, electrochemical corrosion occurs, surface melting occurs, a viscous liquid is generated on the surface, and the plug of the power supply flows back and forth in the electrolyte to melt the spikes on the rolling bearing. Generally, a numerically controlled lathe for electrolytic spike removal is used, and suitable fixtures can be made according to the construction of the rolling needle bearing. Generally, materials with good conductivity such as copper or brass are selected, and epoxy resin glue is used for insulation and maintenance of the parts that do not need to be de-spiked. This method is suitable for colored metal plates, light metal parts, and especially for spikes in complex parts and transverse holes and internal surfaces of holes produced on slewing bearing. It can remove unique hard parts such as molybdenum, nickel, titanium and heat treatment.
High-temperature valves generally use a mixture of methyl substances to burst into heat at a moment of sustained high temperature to burn off the spikes of the parts, and other parts are not easy to deform. This method is suitable for all metal materials, plastic and rubber parts and various shapes of rolling bearing parts. In practical operation, the working pressure of the gas and the proportion of the mixed gas should be adjusted according to the characteristics of the raw materials of different parts. Generally speaking, the working pressure of the gas for steel and carbon steel is higher, and the working pressure of the gas for brass and aluminum alloy profiles is lower. Before applying the parts, clean and dry them, and induce irritation before placing them in a saturated solution of calcium phosphate to remove the air oxide film.
Put the slewing bearing bushing parts that must be de-spiked into a chemical solution, and the metal material on the surface of the parts will be converted into a saturated solution in the form of positive ions. These positive ions are concentrated on the surface of the product workpiece to produce a resistor layer, which produces a high resistor, low resistance viscous film. The spikes on the surface of the metal material parts will slowly melt and be removed. Different chemical solutions can be selected according to different metal materials to perform selective de-spiking using the principle of electrolytic chemical reaction. The key components of the saturated solution used are sulfuric acid, calcium phosphate, hydrochloric acid, potassium thiocyanate, and hydrochloric acid salt.
The flip grinding method stipulates placing slewing bearing parts and wear-resistant materials in a closed bath, and using the rotation of the bath to self-grinding the polishing material and rolling bearing. This type of machine equipment is also called a rolling mill, which is commonly used to remove spikes from metal materials. This method is usually suitable for small and medium-sized rolling bearing parts, and there are many types of wear-resistant materials. It can be used for spike grinding of materials such as quartz sand, sawdust, aluminum oxide, ceramics, limestone, carbon-carbon composite materials, metal rings, etc. This method has low cost, practical operation convenience, but is not suitable for removing large spikes.
