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Principle of honing machining

Principle of honing machining


Honing is to use one or more whetstones installed on the circumference of the honing head. By means of an inflating mechanism (there are two types of rotary and propelling), the whetstones can be expanded in the radial direction and pressed against the hole wall of the workpiece so as to produce a certain surface contact.At the same time, make the honing head rotate and reciprocate, and the parts do not move.Or the honing head only rotates and the workpiece reciprocates, so as to realize the honing.

In most cases, there is a float between the honing head and the spindle or between the honing head and the fixture.In this way, the honing head is guided by the hole wall of the workpiece.As a result, the machining precision is less affected by the precision of the machine tool itself, and the formation of the hole surface basically has the characteristics of the creation process.The so-called creation process is that the stone and the hole wall grind and trim each other to form the hole wall and the surface of the stone.The principle is similar to that of two moving flat planes grinding into each other to form a plane.

When the honing head rotation and reciprocating motion or honing honing head rotating workpiece reciprocating motion, make the machined surface formation of cross helical cutting trajectory, and within each reciprocating stroke time honing head of revolution is not the integer, and between the two trips, honing head relative to the workpiece in the weeks to stagger Angle, the movement of the honing head in a hole on the wall of each trajectory will not repeat it.In addition, with each turn of the honing head, the cutting paths of the honing stone and the previous one overlap along the axis, making the connection between the front and back grinding paths more smooth and even.In this way, the chance of interference between the hole wall and the oil stone surface is approximately equal throughout the honing process.As honing hole surface and, therefore, oil stone surface continuously produce interference point, to put these interference point grinding and generate new interference of more points, and continuous grinding, make the hole and sharpening stone surface contact area is increased, the degree of mutual interference and cutting effect weakening, holes and oil-stone roundness and cylindricity also constantly improve, finally complete the initiative process on the surface of the hole.To get a better cylindricity, honing often involves turning the part around or changing the axial position of the honing head to the workpiece when possible.  

One point to note: because the honing stone is made of abrasive materials such as diamond and cubic boron nitride, the honing stone has little wear in the processing, that is, the honing stone has little trimming from the workpiece.Therefore, the accuracy of the hole depends to some extent on the original accuracy of the honing stone.Therefore, when diamond and cubic boron nitride are used, the stone should be well trimmed before honing to ensure the accuracy of the hole.

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