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HONING is what ?

Honing is a special process for cutting, and it is also an efficient machining method in finishing. Honing can not only remove large machining allowances, but also is an effective machining method to improve dimensional accuracy, geometric accuracy and surface roughness, and is widely used in the manufacture of automotive parts.


Honing processing principle

Honing is used to install one or more whetstones on the circumference of the honing head. The open-up mechanism (rotary type and push type) expands the whetstone in a diameter direction so that it presses against the wall of the workpiece hole to produce a certain surface. Contact, while rotating and reciprocating the honing head, the parts are not moving, or the honing head is only optional, the workpiece reciprocates to realize the honing
In most cases, the boring head is floating between the machine spindle or between the boring head and the workpiece holder. In this way, the honing head is guided by the wall of the workpiece hole during machining. Therefore, the machining precision is less affected by the accuracy of the machine tool itself. The formation of the hole surface i basically has the characteristics of the creation process. The so-called creation process is the formation of the hole wall and the oil stone surface by the grinding stone and the hole wall facing each other.
The principle is similar to the principle that two planes of motion planes face each other to form a plane.

During honing, the honing head rotates and reciprocates, or the honing head rotates the workpiece to make a reciprocating motion, so that the processing surface forms a cross-helix cutting path, and the number of revolutions of the honing head is not an integer during each reciprocal stroke time, so that during two strokes, honing The head is offset from the workpiece by a certain angle in the circumferential direction. Such movement makes the trajectory of each particle on the honing head not repeat on the wall of the hole. In addition, for each revolution of the boring head, the cutting trajectory of the whetstone and the previous revolution overlaps in the axial direction, which makes the convergence of the front and rear grinding trajectories smoother and more uniform. In this way, during the whole honing process, the wall of the hole and the surface of the whetstone The interference points are continuously generated, and these interference points are constantly worn away to create new interference points, which are constantly worn away, so that the contact area between the holes and the oilstone surface is continuously increased, and the creation of the hole surface is finally completed. In order to obtain a better cylindricity, in the case of honing, the parts are often turned around, or the mutual position of the honing head and the workpiece axis is changed.
It should be noted that due to the use of abrasives such as diamond and cubic boron nitride in the honing stone, the wear of the stone during processing is very small, ie, the number of whetstones trimmed by the workpiece is very small. Therefore, the accuracy of the hole depends to some extent on the original accuracy of the whetstone on the honing head. Therefore, when using diamond and cubic boron nitride whetstone, the whetstone should be well-dressed before honing to ensure the accuracy of the hole.

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