Sales Hotline: 15206508233 cylinder tube rolling processing, because the surface layer retained residual surface compressive stress, helps to crack the surface of small cracks, hinder the expansion of erosion. In order to improve the corrosion resistance of the surface, and can delay fatigue cracks or expand, thus improving the fatigue strength of grinding tube. Through rolling, rolling surface to form a layer of cold hardening layer, reduces the grinding contact surface of the elastic and plastic deformation, thus improving the grinding abrasion resistance of inner tube, while avoiding grinding burns caused by. After rolling, the decrease of surface roughness can improve the matching property. Large diameter grinding tube rolling is a chipless machining, the plastic deformation of metal at room temperature, the micro roughness of rolling flat workpiece surface can change the surface structure, mechanical properties, shape and size of the. Therefore, this method can achieve two purposes of finishing and strengthening at the same time, which can not be achieved by grinding.
Large diameter grinding tube in whatever machining method, leaving marks uneven fine in parts of the surface will appear, the phenomenon of peak valley interleaves, grinding tube rolling processing principle: it is a kind of pressure finishing, is characterized by the use of cold plastic metal at room temperature, using the rolling tool applied a certain pressure on the surface of the workpiece, the workpiece surface of metal plastic deformation, fill in the original residual indentation trough, and reach the surface roughness value reduction. Because of the plastic deformation of the rolled surface metal, the cold hardening and grain refinement of the surface layer, the formation of dense fiber, and the formation of residual stress layer, the hardness and strength increased, thus improving the wear resistance, corrosion resistance and compatibility of the workpiece surface. Rolling is a non cutting plastic processing method.
Large diameter pipe is grinding (honing tube, grinding tube, air pipe, grinding honing tube, pipe, tube, cylinder grinding cylinder pipe) in various areas called different names
Large diameter grinding tube by honing machine, machine tool spindle and the honing head is floating connection; but in order to improve the ability to correct the geometry of a workpiece, but also can be used in rigid connection. The model tube is mainly used to process various cylindrical holes with a diameter of 5~500 millimeters or more, such as cylinder, valve hole, connecting rod hole and box hole, etc. the ratio of hole depth to aperture is up to 10. The cylinder tube is made by rolling process, because the surface layer has residual compressive stress on the surface, which helps to seal the small surface cracks and hinder the expansion of the erosion action. In order to improve the corrosion resistance of the surface, and can delay fatigue cracks or expand, thus improving the grinding method for repairing surface defects of steel pipe fatigue strength of honing
In the processing of steel pipe honing surface before there will be a lot of pitting, which is an important factor affecting grinding tube quality, after grinding to obtain good quality hydraulic cylinder tube, you need to repair these pits. So, hydraulic cylinder tube surface defect repair methods what?
1. increase the amount of cold drawing deformation
The increase of cold drawing deformation times, increase the total deformation, can decrease the pitting depth, reducing grinding allowance to honing.
2. optimization of hot rolled tube blank
The pock flaws are caused by cold drawn pipe hot rolling tube, therefore, by choosing the corrosion degree of small, uniform wall thickness of hot-rolled tube, can reduce pitting defects, improve the yield of the cylinder.
Cleaning of inner hole defect of 3. hot rolling pipeQuality is the premise of the product, only the quality is good, is the fundamental customer service, therefore, the hydraulic cylinder tube surface defects for the perfect repair, is our biggest commitment to customers
Advantages of honing pipe
1, improve the surface roughness, roughness can reach Ra less than about 0.08 M.
The 2 amendment, roundness, ovality can be less than 0.01mm.
3, improve the surface hardness, the deformation is eliminated, the hardness increased more than 4 DEG HV
4, residual stress layer after processing, improve fatigue strength increased by 30%.