SKF bearing design measure and bearing hole of the size of the standard

The product manufacturing process of the contents and requirements according to certain procedures, fixed in the form of documents and standards, the process file was created. Process can be divided into two kinds: one is the integrated process files, to all the requirements for a product prepared uniformly in a file, simple and clear, easy to query, applicable to the product of simple structure, small batch production. Second, file type process, i. e. the professional characteristics of classification according to the product manufacturing technology, outstanding professional characteristics, applicable to all kinds of products. Rolling bearing as a standardized components, mechanical parts in addition to the individual variety, most varieties of the similar production process. Therefore, SKF bearing parts manufacturing process documents of easy to realize the standardization, seriation. 1. Process file types of bearing parts manufacturing process generally can be divided into three categories: dominant process documents, administrative process files and productive technology. Leading technology is the foundation of administrative process file is used to supply parts needed materials in the process of manufacturing and management, productive process document used to guide production. 2. Process document compilation basis mainly includes: the design of the product pattern, and product related national standards and enterprise standards, internal standards and regulations and the special requirements of customers, the enterprise has the technology and equipment, technology and management level, production scale and production layout, etc. 3. The characteristics of the process documents ( 1) Command files is to ensure that the quality of the product, to ensure orderly and carry out enterprise management the important laws and regulations, once issued, must stick to it. ( 2) Basic process documentation is an enterprise's production organization, material supply, quality management and economic accounting basis, is a basic document in various business units of enterprises to carry out the work. ( 3) Operational process documentation not only requires accurate and complete, unified and standard, also requires a simple, straightforward, suitable for normal operation with use. In the practical work, therefore, must have strong operability. ( 4) Enterprise vivid process documentation is formulated according to the actual status of the enterprise, its content is focused in technology, management and the advantage of process equipment, etc, from the aspects of a embodies the strength and image of the enterprise. ( 1) Bearing hole of the bearing hole of the measurement can be used inside diameter scale after checking the basic dimension measurement on the outside micrometer, at the same time also need to bearing hole of the roundness and cylindricity measurement. Burn SKF bearing often makes the bearing hole in the narrow opening diameter and roundness error, the bearing to the detriment of the normal work of the. If on the surface of the connecting rod bolt positioning with kuang, connecting rod bearing cap will shift to make bearing hole of the roundness error. Bearing hole of the roundness error should be controlled within the dimensional tolerance, and cylindricity should be strictly controlled. ( 2) Bearing the main size measurement (1) the thickness of the bearing: will change by the plane fixed outside micrometer probe into sphere, can be used to measure the thickness of the bearing. The thickness of the bearing generally should be controlled in 0. 005-0. 010 mm range, otherwise it will make the SKF bearing inside diameter super bad. Bearing in recent if there are traces of thinning, should be careful when measuring. (2) with the bearing and the bearing hole tightness: cooperate with tightness is bearing more than the amount of free bounce off and surface height to ensure. Measurement under lap height: fit up bearing by the regulation, pay the bearing cap bolts to loosen one after the torque bolt, measured with a feeler clearance of the bearing cover outlet, its value should be zero. 05 ~ 0. 15 mm range. (3) bearing inside diameter: before measuring the SKF bearing must be installed by the regulation combined torque tighten bearing cap bolts by the regulation, with inner scale, colonel in outside micrometer to measure after the benchmark size, measurement to avoid thinned area. Bearing inside diameter and the corresponding value is the difference between the axis neck diameter size fit clearance. (4) main bearing inner hole alignment: main bearing hole of the alignment error is mainly the bearing hole of the alignment error, and the causes of bearing hole alignment error is the deformation of the cylinder block. When the main journal radial circular runout tolerance, check the main journal and bearing the mark, if eat each main bearing the mark position is obviously not consistent, that alignment error difference is big, can be used for skiving, boring bearing or changing the solution to such as cylinder block, otherwise difficult to guarantee the normal work of the engine.