In this Article, We will briefly discuss Grinding Machine for which purpose Grinding Machine is used, parts and types of Grinding Machine and the Grinding Machine working principle.
In the machining of parts, there are two processes by which a piece is shaped by material removal. These processes are chip removal or abrasion.
In the abrasive machining process, the cutting edge that is used to remove material is not defined. One of the tools to perform machining by abrasion is the grinding machine.
What is a grinding machine
A grinding machine is a tool that performs the abrasive machining process. It has a robust abrasive wheel as a material starting tool, which means that it does not have a defined edge.
With this machine, you get a finish of the piece with more precise dimensions and lower roughness than a chip removal process.
Application f Grinding machine
The grinding is a process performed in certain parts having very small tolerances. These can be dimensional (such as diameter, length or angle) or surface finish (such as roughness, scratches, impurities).
The grinding is done many times after a process of chip removal. The chip removal is carried out to eliminate larger areas, and then a surplus is left which will be eliminated by abrasion (with the grinding machine). The result will be more precise and tedious.
Sometimes Grinder is used to increase the accuracy of job size i.e Grinder can grind up to 0.0001 mm. The enormous degree of precision of a CNC grinding machine is hardly measurable with Micrometer
Grinding Machine working principle
The grinding machine is a complex operation machine but easy to use. First of all, so that it receives energy, the electromagnet must be activated. The electromagnet will be in charge of holding the piece and will not move.
Once the piece is placed on the electromagnet, we turn on the machine and turn on the spring that begins to turn. Then we start to move the flywheels that make the electromagnet move in the x, y directions.
NOTE: In large grinding machines there is usually a hydraulic pump so that the movements are not heavy or hard.
We leave the piece under the spring and through the wheel that moves the spring in the z-direction, we go down until the spring comes into contact with the piece.
Then through automatic control, we let the electromagnet oscillate in such a way to achieve the desired dimensions and finish.
Types of grinding machines
There are several types of grinding machines that may depend on the objective (can be for surface finishes, dimensional accuracy), the part to be rectified, the technology used, its size or the need for repetitions, among others.
Flat or surface grinding machines
- Front Grinders: In front grinding machines the grinding wheel is located on a horizontal axis and moves rectilinearly on the piece (from right to left). It is used to remove material quickly, with less precision than other grinders.
- Tangential grinding machines: In this case, the grinding wheel rotates on a vertical axis with circular and pendular movement. In these cases, the work done is much more precise.
Cylindrical grinding machines
External cylindrical grinders: Grinding is done on the external one-piece cylinder. This allows the piece to rotate in the same direction as the wheel.
Internal cylindrical grinding machines: In this case grinding is carried out inside a hollow cylindrical part. The wheel must always be smaller in diameter than the inside of the piece
Cylindrical grinding machines without center: It is for the grinding of small cylindrical parts. In this case, the wheels are two that rotate in the same direction and the piece is placed between them.
Universal grinding machines
They are responsible for machining bodies of revolution which makes them larger and more robust machines than the others. These machines serve to produce among other things, cam trees, pistons, shirts, crankshafts, etc.
CNC grinding machine
These machines were the result of technological progress. The grinding CNC are machines that perform the same procedure, only so that control is computerized.
This has several or better said many advantages:
- The decrease in operator intervention to be automatic.
- Improvement in the operation times.
- Increased finishing accuracy.
- Possibility of programming and establishing a series of steps to follow.
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