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The quilting pipe is processed by scraping and rolling. Since the surface layer has residual compressive stress on the surface, it is helpful to close the tiny cracks on the surface and hinder the expansion of erosion.Thereby improving the corrosion resistance of the surface, and delaying the occurrence or expansion of fatigue cracks, thus improving the fatigue strength of the quilted grinding tube.Through rolling forming, a layer of cold hardening layer is formed on the rolling surface, which reduces the elastic and plastic deformation of the contact surface of the grinding pair, thereby improving the wear resistance of the inner wall of the honing tube. After rolling, the surface roughness value Reduced to improve fit properties.
Hydraulic, pneumatic cylinder specification size, precision Hydraulic and pnoumate linear actuator sandars
Processing methods Working method | Inner diameter of cylinder mm Cylinder ID | length m Length | Straightness mm/m Straightness | Inner Diameter Accuracy ID Tolerance | Wall thickness difference WT Tolerance | Um Roughness |
cold drawn Cold Drawn | 40-320 | ≤12m | 0.2-0.5 | ±5% | 0.8-1.6 | |
cold rolling Cold Rolled | 30-100 | ≥12m | 0.2-0.5 | ±5% | 0.8-1.2 | |
Cold drawing - honing CD-Honed | 40-500 | 8m | 0.2-0.3 | H8-H9 | ±5% | 0.2-0.8 |
cold call-rolling CD-SBB | 40-400 | 7m | 0.2-0.3 | H8-H9 | ±5% | ≤0.4 |
Deep hole boring - honing Rolled-Honed | 320-400 | 8m | 0.2-0.3 | H8-H9 | ±8% | ≤0.8 |
Deep hole boring - rolling Rolled-SBB | 320-400 | 7m | 0.2-0.3 | H8-H9 | ±8% | ≤0.4 |
Mechanical能(néng)mechanical property
steel type Steel grade | cold-drawn (hard)(BK) | Cold drawing + stress relief annealing cold drawn and stress-relieved(BK+S) | hardness Hardness HB | |||
tensile strength TS g bN/mm² | Elongation elongation 35% | tensile strength TS bN/mm2 | Yield Strength YS g sN/mm2 | Elongation elongation 35% | ||
20# | ≥550 | ≥8 | ≥520 | ≥470 | ≥12 | |
45# | ≥650 | ≥5 | ≥600 | ≥520 | ≥12 | |
16Mn | ≥640 | ≥5 | ≥600 | ≥520 | ≥15 | |
25Mn | ≥640 | ≥5 | ≥600 | ≥510 | ≥15 | |
27SiMn | ≥840 | ≥5 | ≥800 | ≥720 | ≥10 | |
The quilting pipe is processed by scraping and rolling. Since the surface layer has residual compressive stress on the surface, it is helpful to close the tiny cracks on the surface and hinder the expansion of erosion.Thereby improving the corrosion resistance of the surface, and delaying the occurrence or expansion of fatigue cracks, thus improving the fatigue strength of the quilted grinding tube.Through rolling forming, a layer of cold hardening layer is formed on the rolling surface, which reduces the elastic and plastic deformation of the contact surface of the grinding pair, thereby improving the wear resistance of the inner wall of the honing tube. After rolling, the surface roughness value Reduced to improve fit properties.
Hydraulic, pneumatic cylinder specification size, precision Hydraulic and pnoumate linear actuator sandars
Processing methods Working method | Inner diameter of cylinder mm Cylinder ID | length m Length | Straightness mm/m Straightness | Inner Diameter Accuracy ID Tolerance | Wall thickness difference WT Tolerance | Um Roughness |
cold drawn Cold Drawn | 40-320 | ≤12m | 0.2-0.5 | ±5% | 0.8-1.6 | |
cold rolling Cold Rolled | 30-100 | ≥12m | 0.2-0.5 | ±5% | 0.8-1.2 | |
Cold drawing - honing CD-Honed | 40-500 | 8m | 0.2-0.3 | H8-H9 | ±5% | 0.2-0.8 |
cold call-rolling CD-SBB | 40-400 | 7m | 0.2-0.3 | H8-H9 | ±5% | ≤0.4 |
Deep hole boring - honing Rolled-Honed | 320-400 | 8m | 0.2-0.3 | H8-H9 | ±8% | ≤0.8 |
Deep hole boring - rolling Rolled-SBB | 320-400 | 7m | 0.2-0.3 | H8-H9 | ±8% | ≤0.4 |
Mechanical能(néng)mechanical property
steel type Steel grade | cold-drawn (hard)(BK) | Cold drawing + stress relief annealing cold drawn and stress-relieved(BK+S) | hardness Hardness HB | |||
tensile strength TS g bN/mm² | Elongation elongation 35% | tensile strength TS bN/mm2 | Yield Strength YS g sN/mm2 | Elongation elongation 35% | ||
20# | ≥550 | ≥8 | ≥520 | ≥470 | ≥12 | |
45# | ≥650 | ≥5 | ≥600 | ≥520 | ≥12 | |
16Mn | ≥640 | ≥5 | ≥600 | ≥520 | ≥15 | |
25Mn | ≥640 | ≥5 | ≥600 | ≥510 | ≥15 | |
27SiMn | ≥840 | ≥5 | ≥800 | ≥720 | ≥10 | |
