Abstract
The study carried out to research a manufacturing process of long products for mining industry by a method of cold knurling, in particular, on a stud of a self-drilling bolt used for strengthening of mountain rocks. The solution of the task was obtained by mathematical simulation of the knurling process in the FE software package that allows establishing stress-strain state parameters necessary to analyze forming and loading of the process. According to the R&D carried out on a basis of the two-rolled screw thread rolling machine was developed a technological process for which the knurling rollers were design and created. The manufactured pilot batch of items that’s meeting the requirements for such type of anchors speaks of capability to maintain low-series production of self-drilling fasteners based on the complex profile cold knurling method of a long billet.
Highlights
The modern mining factories faced up with the problem of mine workings fastening in а rather unstable rocks
The study carried out to research a manufacturing process of long products for mining industry by a method of cold knurling, in particular, on a stud of a self-drilling bolt used for strengthening of mountain rocks
The solution of the task was obtained by mathematical simulation of the knurling process in the FE software package that allows establishing stress-strain state parameters necessary to analyze forming and loading of the process
Summary
The modern mining factories faced up with the problem of mine workings fastening in а rather unstable rocks. The most useful manufacturing process from above-mentioned is cold knurling thread process by profiled tool on a two-rollers rolling machine. There is a problem of evaluation the possibility of manufacturing this kind of product in such way with calculation of stress-strain parameters of the process to choose equipment parameters and design technological tools of the cold knurling process of a hollow billet in the two-rolled screw thread rolling machine. For this purpose, a modeling of the process using 3D FE software was carried out. The stress-strain state data could be useful to evaluation of the tools and machinery loading in the knurling and of possibility to produce this type of profile by cold deformation
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