Technical requirements for mirror rolling technology for workpieces before rolling


We say that the mirror rolling technology is applied in the processing industry of mechanical parts, that is, when all the metal parts are processed into the parts we need, they can be applied because the defects or ability of technical processing cannot meet the design requirements. The rolling knife rolling head is only a specific expression of the method implemented by the mirror rolling technology. Rolling head, polished rod rolling machine, CNC tempering machine, rolling knives, hobbing head, scraping and rolling knives - industry standard setting unit Ningbo Gaoxin District Mirror Ph.D. technology is a kind of chipless (non-removed material) Machining, no iron filings are produced throughout the machining process. The machining applies pressure to the surface of the workpiece by rolling the tool. The plastic deformation of the metal is used at normal temperature to flatten the microscopic unevenness of the surface of the workpiece to achieve the purpose of changing the surface structure, mechanical properties, shape and size.

In the machining of mechanical parts, turning, milling, drilling, etc. are the basic means of machining, generally only reach the roughness of Ra1.6-3.2, to reach 1.0 or more, only grinding (honing, squeezing Grinding is also a kind of grinding), electric corrosion processing can also be done, but the equipment investment is large, and the technical requirements of personnel are high!

Rolling has low technical requirements for the technical implementer, as long as the ordinary bench drill can be operated, the precision of the roughness Ra0.2-0.8 can be processed. After rolling, the hardness of the workpiece can be increased by 15% to 30%, and the wear resistance can be increased by 15%.

The dimensional accuracy of the parts processed by rolling is high and can be accurate to 0.003MM. It can be realized without CNC machine tools, and is completely guaranteed by the rolling knife rolling head! And the size can be adjusted! Mirror rolling is the best investment for small mechanical processing companies, and the best way to improve technical competitiveness! The rolling process is easy to master, and can be processed by ordinary drilling machines. Ordinary operators can machine mirror precision and micron precision workpieces! The overall cost of tool use is low, which is 10-100 times lower than the cost of grinding machine, honing machine and ultrasonic rolling.

Rolling processing, due to the surface residual compressive stress on the surface layer, contributes to the closure of the surface micro cracks and hinders the expansion of the erosion effect. Thereby, the surface corrosion resistance is improved, and the generation or expansion of the fatigue crack can be delayed, thereby improving the fatigue strength of the cylinder rod.

The hardness of the blank before the workpiece is rolled has a great relationship with the rolling process. The hardness of the rolling tool is rapidly reduced. From an economic point of view. The hardness of the material must be less than the Rockwell hardness HRC37-40. If the hardness of the workpiece material is higher than 40°, the rolling radial force will increase. For example, when the 45th steel increases the hardness HRC5, the rolling radial force will increase by 10%-20%, causing the tool to be pressed out. . Increase the tolerance of the diameter of the workpiece being rolled. Accelerated rolling tool wear and life is drastically reduced. Rolling will produce a hardened layer on the surface of the workpiece. This layer has obvious delamination with the internal material, which easily causes the surface layer to fall off.

The hardness uniformity of the blank material and the uniformity of the graded structure before the workpiece is rolled have a great influence on the rolling performance. The material with uneven hardness will cause accidental errors in the rolling parameters, and increase the size of the dispersion belt. Width, resulting in unevenness of the tooth profile.

Whether the surface of the blank before the workpiece is rolled has a obvious effect on the rolling effect. If there are bubbles, non-metallic impurities or different material properties and impurities. Then the workpiece rolled out will cause cracks, delamination and the like. For example, cast iron materials are prone to generate pores, pits, uneven materials, etc., and the processing is prone to dust, which will have a greater impact on the life of rolling tools.

The residual diameter of the blank before the workpiece is rolled and its tolerance also have a great influence on the quality of the workpiece. If the diameter allowance is too large, the rolling knives will contain excess metal and the workpiece will be distorted. For example, if the workpiece has a wall thickness of less than 5 mm, the outer circumference of the workpiece will be deformed during rolling, and the hobbing head may be damaged. .

The diameter of the blank before the workpiece is rolled is too small. However, because there is not enough metal deformation, the processed workpiece can not reach the design size and be scrapped. The diameter of the blank. Not only depends on the accuracy of the specification of the workpiece itself. And it is also directly related to the selection of the rolling knife and the processing parameters.