Knurling is a mechanical process used to roll patterns on the handles of metal products or other work surfaces, mainly for anti-slip purposes.
The method of using a knurling knife to roll the surface of the workpiece into a straight or net-like pattern is called knurling. After knurling the workpiece, it can increase the aesthetics and is easy to hold. It is usually used for the outer surface treatment of microtubes, winch wrenches and other parts.
The knurling knife is composed of a roller and a knife body. According to the pattern, it is divided into straight grain and net grain
Then divide the pattern into thickness, and the modulus m is used to indicate the designated mark example for knurling:
Modulus m = 0.2, straight-grain knurling, its stipulation mark is:
Straight grain m0.2 GB 6403.3-1986
Modulus m = 0.3, net knurling, its regulations are marked as:
Mesh m0.3 GB 6403.3-1986
Classified by the number of knurls
Knurling cutters can be divided into three types: single-wheel, double-wheel and six-wheel.
The single-wheel knurling cutter consists of a straight-grained roller and a knife handle, and is usually used for straight-graining.
The double-wheel knurling cutter consists of two rollers with different rotation directions, a floating coupling head and a tool holder. Usually used for rolling nets.
The six-wheel knurling cutter is composed of three pairs of rollers, and the three pairs of rollers are supported by floating connectors, which can respectively roll out three kinds of mesh patterns with different thicknesses.
Knurling method
In the embossing process, the roller rolls the metal layer on the processed surface to produce a certain plastic deformation to form a pattern, so the radial pressure generated during the embossing process is very large.
Before embossing, the embossing surface of the workpiece should be reduced (0.8~1.6) m (modulus) according to the nature of the workpiece material and the size of the embossing pitch P.
Install the knurling knife
The knurling tool is clamped on the tool holder of the lathe, and the center of the knurling tool is equal to the rotation center of the workpiece.
When rolling non-ferrous metals or demanding workpieces on the knurled surface, the roller surface of the knurling cutter is inclined 3°~5° to the left relative to the surface of the workpiece, cutting and not easy to produce chaotic lines.
Scrolling considerations
(1) At the beginning of rolling, a higher pressure feed tool must be used to make the carved workpiece have a deeper pattern, otherwise it is easy to produce chaotic lines.
Figure 7 The horizontal feed position of the knurling cutter
(2) In order to reduce the radial pressure at the beginning of rolling, 1/2 to 1/3 of the roll surface width can be in contact with the workpiece, as shown in Figure 7. The tool can be easily pressed into the surface of the workpiece. After the knurling of the parking inspection vehicle meets the requirements of the workpiece, it can be driven longitudinally. After scrolling in this way 1 to 3 times, until the pattern stands out.
(3) When knurling, the cutting speed should be reduced, generally 5~10m/min. Choose a larger longitudinal feed, usually 0.3~0.6mm/r.
(4) When knurling, cutting oil must be poured in to lubricate the rollers, and often cut off the cutting chips produced by the rollers.
