Deburring bits are the deburring tools that are used on the deburring machines, which is designed to process the deburring for the targeted objects. In the metal working process, metal burrs are raised edge or small pieces of materials that remains attached to a work piece after a modification process, which are not ideal to the performance of the work pieces so that the mechanism of removing those un-wanted edges by deburring tools is considered very important. It is usually an unwanted piece of materials and is removed with deburring tools or some other professional experts call them deburring bits at first, and later by the machine in a process called the deburring process.
Metal burrs are most commonly generated by machining operations, such as grinding, drilling, milling, engraving or turning. It may be presented in the shape of a fine wire on the edge of a freshly sharpened tool or as a raised portion of the surface of the work pieces.
This type of metal burrs is commonly formed when a hammer strikes a surface, and deburring conducted by deburring bits accounts for a significant portion of manufacturing costs. Therefore, the invention of deburring machines are meant to deal with those issues cause during metal working with advanced specifications that can cost down the manual operation of deburring to the maximum extend of working level.
During the metal working process, most deburring process is by the grinding mechanism rather than milling method. The essential definition of grinding is that this is one of the power tools or machine tools utilized for grinding process, which is a type of machining using an abrasive wheel as the cutting tool for processing.
Each grain of the abrasive on the wheel's surface cuts a small chip from the work piece through shear deformation. Deburring grinding is adopted to finish work pieces that must show high surface quality and high accuracy level of shape and dimensions. The accuracy in dimensions in grinding is generally of the order of 0.000025 mm standard. In most applications, it tends to be a finishing operation and removes comparatively little metal, about 0.25 to 0.50 mm depth. There are a few of grinding machine types, such as belt grinders, bench grinders, cylindrical grinders, surface grinders, tool grinders, jig grinders, gear grinders, center grinders, die grinders, and angle grinders.
With the professional deburring tools rather than using other conventional grinding wheels, the whole process of deburring would be much faster and the outcome would be smoother even though the process is conducted on grinders. The grinding machine is consisted of a bed with a fixture to guide and clamp the work piece, and a power-driven grinding wheel spinning at the specific speed, which is determined by the wheel’s diameter and manufacturer’s rating. The deburring tools, or grinding heads, can travel across a fixed work piece, or the work piece can be moved while the grind head stays in a fixed position for the process.
Today, due to the invention of multiple axes on the machine tools, such working mechanism is common and thus the movement is no longer a critical issues. Regarding the cylindrical grinding, the essential definition of cylindrical grinding is that the machine must have four critical actions: Firstly the work piece must be constantly rotating; secondly, the grinding wheel, i.e. cutter, must be rotating constantly; thirdly, the grinding wheel is fed forwards and backwards towards the work piece. Last, work pieces are traversed with respect to the grinding wheel.
The majority of cylindrical grinders nowadays utilize all the four movements, while there are still grinders that only utilize three of the four actions to process. To compare with other similar model, even though roll grinding is nearly the same as cylindrical grinding in most of the processing details, there are some critical differences between the two categories. In fact, roll grinding method is developed specifically for certain issues that usually require processing machines that are designed for such heavy duties, and the same requirements also apply to the deburring tools.
The whole process, as from grinding to deburring, are considered to be at the end of the entire metal working process, so how and what to remove the unwanted metal chips are the main concerns of the grinding machine users. It is expected that with a more comprehensive CNC control system together with a well trained operators, the whole deburring and polishing steps of the work pieces’ final outcome can be further perfect.
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