Honing process and its application in auto parts manufacturing (3)

1. The high precision machining in particular small and medium <br> <br> through hole, the degree of its cylindrical to within 0.001mm. Some parts with uneven wall thickness, such as connecting rods, have a roundness of 0.002 mm. For large holes (pore diameters above 200 mm), the roundness can also reach 0.005 mm. If there are no ring grooves or radial holes, it is also possible that the straightness is within 0.01 mm/1 m. Honing is more accurate than grinding because the bearing that supports the grinding wheel is located outside the bore when grinding, which causes deviations, especially for small hole machining, and the grinding accuracy is even worse. Honing generally only improves the shape accuracy of the workpiece, and it is necessary to take some necessary measures to improve the positional accuracy of the part. If the panel is used to improve the perpendicularity of the end face of the part and the axis (the panel is mounted on the stroke bracket, the adjustment is made perpendicular to the rotating spindle, and the part is machined on the panel).

2. The surface quality <br> <br> cross textured surface, it is conducive to maintaining the lubricating oil storage and oil film. It has a high surface support ratio (the actual contact area between the hole and the shaft and the ratio of the area of ​​the joint between the two), so that it can withstand large loads and wear resistance, thereby improving the service life of the product. The honing speed is low (one tenth of the grinding speed), and the oil stone is in surface contact with the hole, so the average grinding pressure of each abrasive grain is small, so that the heat generated by the workpiece is small when honing, and the surface of the workpiece is almost No thermal damage and metamorphic layer, small deformation. The honed surface has almost no sand and extruded hard layers.

3. The main processing a wide range of processing various <br> <br> cylindrical hole: through-hole, intermittent axial and radial holes, if the radial bore hole or slot, the key slot, a spline hole, the blind Holes, multi-step holes, etc. In addition, with a special honing head, it is also possible to machine tapered holes, elliptical holes, etc., but because the boring head has a complicated structure, it is generally not used. The cylindrical honing tool can be used to honing the cylinder, but the margin of removal is much less than the margin of the inner honing. Honing can be used to process almost any material, especially diamond and cubic boron nitride abrasives, further expanding the application of honing and greatly improving the efficiency of honing.

Figure 2 Several machining defects that occur during part machining

4. The cutting <br> <br> remaining amount to achieve the desired drawing accuracy, using the least margin honing a processing method for removing all processing methods. In the honing process, the honing tool uses the workpiece as a guide to cut off the excess allowance of the workpiece to achieve the required precision of the workpiece. When honing, the honing tool first picks up the place where the allowance is the largest, and then gradually picks up the place where the least amount of allowance is needed.

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Stainless Steel Welded Square Pipe

Stainless steel square tube is a hollow strip of steel, because the cross section is square so called square tube. A large number of used for conveying fluid pipelines, such as oil, natural gas, water, gas, steam, etc., in addition, in bending, torsion strength at the same time, lighter weight, so it is also widely used in manufacturing machinery parts and engineering structures.