Honing process and its application in auto parts manufacturing

The Honing Process is a special form of grinding and an efficient method of machining in finishing. This process not only removes large machining allowances, but also is an effective machining method for improving the dimensional accuracy, geometric accuracy and surface roughness of parts, and is widely used in the manufacture of automotive parts.

Honing honing using <br> <br> principle attached to one or more of honing stone on the circumference of the head by the opening up mechanism (with rotary and push both) of the stone up to open radially, so that pressure To the wall of the workpiece hole to create a certain surface contact. At the same time, the honing head is rotated and reciprocated, and the parts are not moved; or the honing head is only rotated, and the workpiece reciprocates to achieve honing.

In most cases, the honing head is floating between the honing head and the machine tool spindle or between the honing head and the workpiece holder. Thus, the honing head is guided by the wall of the workpiece hole during processing. Therefore, the machining accuracy is less affected by the accuracy 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 oil stone and the hole wall are mutually researched and mutually trimmed to form the hole wall and the oil stone surface. The principle is similar to the principle that two planes of flat motion are mutually studied to form a plane.

During the honing, the honing head rotates and reciprocates or the honing head rotates the workpiece to reciprocate, so that the machined surface forms a cross spiral cutting path, and the number of revolutions of the honing head is not an integer during each reciprocating stroke, so the honing between the two strokes The head is offset from the workpiece by a certain angle in the circumferential direction. Such movement causes the trajectory of each of the abrasive grains on the boring head to not be repeated. In addition, each time the honing head rotates, the cutting trajectory of the whetstone and the previous one has an overlap in the axial direction, which makes the connection of the front and rear grinding trajectories smoother and more uniform. Thus, during the entire honing process, the chances of each point of the hole wall and the oil stone face interfering with each other are about equal. Therefore, as the honing progresses the surface of the hole and the surface of the oil stone to continuously generate interference points, these interference points are continuously removed and new more interference points are generated, and the grinding points are continuously removed, so that the contact area between the holes and the oil stone surface is continuously increased. The degree of interference and the cutting effect are continuously weakened, and the roundness and cylindricity of the hole and the oil stone are also continuously improved, and finally the creation process of the hole surface is 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 axial direction of the workpiece is changed.

It should be noted that since the honing stone is made of abrasive such as diamond and cubic boron nitride, the wear of the whetstone in the processing is small, that is, the amount of whetstone is small by the workpiece. Therefore, the accuracy of the hole depends to some extent on the original precision of the whetstone on the honing head. Therefore, when using diamond and cubic boron nitride whetstone, the whetstone should be well trimmed before honing to ensure the accuracy of the hole.

1. The honing of the cutting process at constant pressure feed honing <br> <br> constant pressure in the feed mechanism to feed at a constant pressure against the hole wall, is divided into three stages.

The first stage is the shedding cutting stage. This constant pressure honing starts at the beginning due to the rough wall of the hole, the contact area between the oil stone and the hole wall is small, the contact pressure is large, and the convex portion of the hole wall is quickly worn away. However, due to the high contact pressure on the surface of the oil stone and the wear of the oil-and-binder binder by the chips, the bonding strength between the abrasive particles and the binder is reduced. Therefore, some of the abrasive grains fall off under the action of the cutting pressure, and the oil stone surface is exposed. Abrasive grain, this is the oil stone self-sharp.

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