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Honing process principle

I. Honing Technology Principle
Honing is a special form of grinding and an efficient method of finishing. This process not only removes the large machining allowance (honing or polishing in the 1950s), but also is an effective processing method for high precision Parts'size, geometric shape accuracy and surface roughness.

(1) The characteristics of honing: (1) High accuracy of honing: (1)
Especially for some small and medium-sized optical through holes, the cylindricity can be less than 0.001 mm. Some parts with uneven wall thickness, such as connecting rods, have roundness up to 0.002 mm. For large holes (with aperture less than 200 mm), the roundness can also reach 0.005 mm. If there is no ring groove or radial hole, the straightness is also possible within 0.01 mm. Honing is more precise than grinding. Bearings supporting grinding wheels are located outside the honed holes during grinding, which will cause deviation, especially for small holes, and the grinding accuracy is worse than honing. Honing generally can only change the shape accuracy of the processed parts. In order to change the position accuracy of the parts, some necessary measures need to be taken. For example, the perpendicularity between the end face and the axis of the part can be improved by using the panel (the panel is installed on the stroke arm and adjusted to be perpendicular to the rotating spindle, and the part can be processed on the panel).

2. Good surface quality:
The surface is cross mesh, which is conducive to the storage of lubricating oil and the maintenance of oil film. It has a higher surface support ratio (the ratio of the actual contact area between the hole and the shaft to the matching area between them), so it can bear a larger load and wear resistance, thus improving the service life of the product. Honing speed is low (a tenth of the grinding speed), and the asphalt is in contact with the hole, so the uniform grinding pressure of each abrasive particle is small, so the heat of the workpiece is very small, there is almost no thermal damage and metamorphic layer on the workpiece surface, and the deformation is small. There is almost no sanding and extrusion hard layer on the honing surface. Grinding has higher cutting pressure than honing. The grinding tool and workpiece are in line contact and have higher relative speed. As a result, high temperature will occur in the local area, which will lead to permanent damage to the surface structure of parts.

3. Wide range of processing:
It mainly processes various cylindrical holes: light through holes. Axial and radial holes with interruptions, such as radial holes or slots, keyway holes, spline holes. Blind hole. Multi step holes. In addition, the special honing head can also process conical holes, elliptical holes, etc., but because of the complex structure of the honing head, it is generally not used. Cylinders can be honed with cylindrical honing tools, but the remaining amount in the past is far less than that in the inner cylindrical honing. Almost any material can be processed, especially diamond and cubic boron nitride abrasives. It also improves the efficiency of honing.

2) Honing principle:.
1. Honing is the use of one or more oil stones installed on the circumference of the honing head. The oil stones are expanded along the radial direction by the expanding mechanism (there are two kinds of rotating and pushing) to press the oil stones to the workpiece hole wall in order to produce a certain surface contact. At the same time, the honing head rotates and reciprocates, the parts do not move; or the honing head only rotates, and the workpiece moves to and fro, so as to realize honing.

2. In most cases, the honing head is floating between the machine tool spindle or between the honing head and the workpiece fixture. In this way, the honing head is guided by the hole wall of the workpiece. 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 stones and the pore walls are studied and trimmed to form the pore walls and the surface of the oil stones. Its principle is similar to that of two planar moving plates grinding each other to form a plane.
During honing, because the honing head rotates and moves to and fro or the honing head rotates to and fro the workpiece, the machining surface forms a cross helix cutting track, and the number of turns of the honing head is not an integer in each reciprocating travel time. Therefore, during the two travel times, the honing head staggers a certain angle relative to the workpiece in the circumferential direction. This movement causes the honing head to stagger a certain angle relative to the workpiece in the circumferential direction. The trajectory of each abrasive particle on the hole wall will not repeat.

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