Rolling is a small non-metal cutting one of the processing technology with high productivity, savings in raw materials and so on, and you can use the lathe, only supported by the necessary tools, suitable for small batch production. Roll forming machine
Rolling process is very simple processing mechanism. When using a high surface hardness, roughness smaller ball rolling surface of the workpiece to be machined, by the strength of its local compression. When the compressive stress is greater than the material fatigue limit, that the surface will produce plastic deformation of the workpiece surface so as to achieve the purpose of processing. When the rolling surface of the workpiece being squeezed, its metal surface is compacted, its molecules are more closely and orderly, and some minor defects such as pores, slag folder, uneven texture can be improved or eliminated, so that mechanical properties, such as fatigue strength, yield strength, surface hardness can be increased. Practice shows that after the material upon rolling, the surface hardness generally increases by about HV40, is rolling surface roughness The surface roughness by rolling and rolling with the rolling surface hardness and surface roughness, and when be processed surface hardness HRC30 lower than the ball around, the surface to be machined or even get the same with the rolling surface roughness, rolling process is not processing the shortcomings of high hardness material or brittle material.
Here we use three examples of Rolling.
A thermocouple pad processing
Thermocouple pad material for industrial copper, in the past with cylindrical bar turning process, single feed consumption 0.492kg, the best surface roughness can reach Ra1.6μm, processed by rolling method, single feed consumption is only 29g, the surface roughness degree up to 0.8μm. Greatly reduced cost and improved product quality. Figure 1 Schematic diagram of the workpiece Rolling, rolling tool Figure 2.

Figure 1 Schematic diagram of hot rolled dual pad

Figure 2 Rolling Tool
2 cover processing
Workpiece shown in Figure 3, the material is Q235-A, if the workpiece by turning not only material and labor costs, but also difficult to ensure quality; the use of a press law making, not only the poor die design and manufacturing, and because the small volume will lead to manufacturing costs, while the use of rolling, then much simpler.

Figure 3 cover
As the two parts was 90 ° of bending, so be subject to two-step process. The first step of the plate using 100 × δ1.5 blank shown in Figure 4, the blank mold and pressed through between the top cone, using the tool blank roll into 66 round-shaped cover of Straight Edge. Figure 5 shows the second step and then another short way to rolling straight edge, and then turning round to the size in the last milling four arc-shaped gap. As the thinner parts, and bending are at right angles to prevent rolling when the right angle bend in the complete rupture, should leave office by rounded rectangular mold.

Figure 4 cover processing diagram

Cover processing diagram of Figure 5
3 roller rotary joint in vivo processing
Inside and outside the joint in Figure 6, shown in Figure 7, made of 2Cr13, assembly, inside and outside the raceway joint with a number of 9.525 mm between the ball rolling grains. Work, by the rolling ball to achieve internal and external rotation between joints. In addition to required size Raceway process also requires an accurate external surface must be smooth, otherwise the movement will increase the resistance to internal and external joint rotation not working.

Figure 6 rotary joint body

Figure 7 rotary joints in vitro
The usual process is turning, roller blade with the ground into an arc-shaped model car out and stay out of mill volume, and then grinding machine with a special roller to the requirements. Generally not specific for roller grinder processing factory use of a rolling process, can also receive similar effect.
Processing method is first turned to the size of internal and external connectors, only the arc raceway model lathe tool with R4.9 processing and rolling left margin 0.01mm ~ 0.02mm, the surface roughness should reach Ra1.6. Then if You-Xin of Beijing Institute of Chemical Machine graduate, major in mechanical manufacturing and design work. Figure 8 shows the  Roll forming rolling tool installed in the turret on the gradual roll roller rolling part because finishing, processing and surface dimensions changed little, even after repeated rolling difficult than 0.05mm, and many times rolling, machining metal surface prone to fatigue, thus affecting the surface roughness, it was rolling before rolling the surface to be processed to Ra1.6 for good, rolling number, usually not more than four times as a rolling body rolling grains The relationship between surface roughness Rolling great time, some extra attention. Roll surface roughness of tablets best reach Ra0.2, in the rolling process, when found in grain surface, roll lose luster dimmed when the surface of hair Ukraine, should be replaced, particularly in the last rolling, the new roll grain processing to improve the quality Raceway great benefit.

Figure 8 roller rolling tool
As for rolling element bearings are mostly rolling grains, the surface hardness of HRC65 or more and more in, so generally speaking, material hardness less than HRC40 workpiece processing by rolling method to obtain better results.