Grinding workpieces is a common machining operation, performed when very tight tolerances and surface finishes are required. Operators of vertical face grinders must be familiar with the machine tool itself, as well as how to select and use grinding wheels, workpiece fixtures, and coolant in order to successfully perform grinding operations. The article will mainly introduce how to calculate the grinding wheel speed of vertical end grinder.
Vertical face grinder machine tools are usually designed for grinding processes and require appropriately manufactured grinding wheels. On the other hand, when the lower grinding wheel is used for surface grinding of various types of high-alloy and high-strength workpieces, very low grinding wheel speeds, about 3,000 to 4,000 fpm, are required as a means to minimize heat generation. In addition, , There are certain types of materials and workpieces that are particularly sensitive to heat.
The speed of the grinding wheel depends on the type of grinding operation, such as external or internal grinding or cutting operations. The working speed depends on the type of work, the type of grinding and the desired finish. For higher working speeds, it is recommended to use harder grinding wheels and vice versa.
Calculate the speed of the grinding wheel of a vertical end grinder
To calculate the rotational speed of the grinding wheel of a vertical end face grinder, it is necessary to consider that the circumferential wheel traversed by the circumference of the wheel on the abrasive particles was once a wheel per revolution. So their speed is equal to the circumference (in feet) multiplied by the revolutions per minute (RPM).
In addition, do you know what RPM represents in the rotational speed of the grinding wheel of a vertical end face grinder? RPM = revolutions per minute; defined as the complete shaft speed per minute. SFPM = surface feet per minute; defined as the distance of any kind of abrasive particles moving on the cutting surface per minute. The wheel speed is usually given in SFPM, while the machine speed is usually expressed in RPM.
In addition, how fast does the grinding wheel spin? The speed of the grinding wheel should be maintained in the range of 5000 to 6500 feet per minute (1525 to 1980 meters per millimeter), unless there are special conditions or the use of equipment and grinding wheels designed to significantly increase the speed of the grinding wheel.
How to calculate surface velocity from RPM? Multiply the angle of the processed object by the peripheral speed to measure the rotational speed. For example, if it rotates at 400 rpm: 87.98×400=35,192. This is the surface speed of the object, measured in inches per minute. Divide this answer by 63,360, which is the number of inches in a mile: 35,192÷63,360=0.555.
What is the maximum speed of the grinding wheel of a vertical end grinder
One potential cause of serious injury in the grinding process of a vertical end grinder is an easy to cause negligence: operating the grinding wheel under overspeed conditions. Although a wheel that runs far enough beyond its rated maximum speed may break within a few minutes after operation, a wheel that runs only slightly faster than its rated speed may also cause danger. This less serious overspeed situation may cause damage to the wheels, which may cause damage after further use. For example, operating an enhanced 9-inch diameter 27-type grinding wheel with a maximum speed of 6,600 rpm on a 7-inch grinder with a speed of 7,700 rpm can cause the grinding wheel to break. This type of cracking may lead to rupture in the future.
The danger of running at overspeed comes from centrifugal force. As a result of the rotational movement, centrifugal force is what causes the weight at the end of the string to pull the taught string when the weight swings in a circle. When the grinding wheel rotates, the same force causes the mass of the grinding wheel to pull outward from the center of rotation.
In short, never overspeed the grinding wheel. It is necessary to compare the speed of the vertical end face grinder with the speed marked on the grinding wheel or packaging to ensure that the speed of the machine is equal to or lower than the maximum working speed of the grinding wheel. The risk of exceeding this level is not only wheel damage, but also the safety of workshop personnel.
How to calculate the speed of the grinding wheel of a vertical end face grinder? What is the maximum speed of the grinding wheel of a vertical end face grinder? Reading the article, we can clearly know the answer. To calculate the speed of the grinding wheel of a vertical end face grinder, it is necessary to consider that the circumferential wheel traversed by the wheel circumference on the abrasive particles used to be one wheel per revolution. So their speed is equal to the circumference (in feet) multiplied by the revolutions per minute (RPM).
