| Optical glass is mainly used for manufacturing mechanical equipment or opticalinstrument lenses, prisms, mirrors, windows and other glass materials. Modernphotoelectric products, civilian and military optical instruments need a large of numberof various types of optical glass. The optical glass is widely used in digital cameras,digital cameras, camera phones, CRT rear projection, LCD projectors, copiers,scanners and the read top.Optical lens is made of optical materials rough by the pressure processing. Opticalglass blank which with different length, width and thickness, the appearance ofirregular, uneven surface is the plate. In order to process optical pressure rough,manufacturers will be based on the specifications of the optical lens, cut as a weight ofabout0.5～30g of bulk glass.At present, the existing block of optical glass blank processing technology is toburst optical glass blank into strips by the resistance wire, and then cut them into bulkglass of required weight according to the experience by the cutting machine. Thisprocess depends on the experience of works. In the burst and cutting processes, evenhighly skilled works, material loss is also large. Processing out of the bar and glassblock is not regular, the weight dispersion of glass is large and lead to post-processingout of the rough pieces of scrap rate-pressure large. And it is labor-intensive processing,automated production is not high. As the optical glass brittleness, hardness, blank sheetof irregular, uneven, expensive, if using CNC multi-blade cutting equipment on theconventional processing conditions, the optical glass is easy to crack, poor surfacequality, tool wear serious, high processing costs and the material utilization also is low.This article is from this reality, intends to design a rolling mill with a continuoushot-rolling process of the optical glass blank plate. Make the machine to meet theoptical glass blank plate heated to softening point and extrude to form a certaindiameter bar by the roll, and then the bar is used for subsequent processing. Firstly, usethe traditional mechanical design method to calculate the size parameter of variousparts of the mill. Secondly, create three-dimensional modeling of the parts of the milland motion simulation with the PRO/E software. Thirdly, calculate the stress of thecore components with the finite element analysis, check the strength of parts, test thedesign meet the requirements. Finally, use the Optistruct software to optimize the core components, make the mill structure is simple, the weight is lighter and the cost islower.The results show that:①In the mill motion simulation analysis, the movement relationship between thevarious parts is properly, match the law of kinematics, no interference appear. All ofthis proves that the design is feasible.②Roll finite element analysis results show that the stress concentration appear onthe roll-shaped hole. This is because the rolling force affect at the hole. The size of thetransition area between roll neck and body are large different. Because of this, this areaappears stress concentration. In actual production, the roll breaking appears on thisarea. Frame finite element analysis results show that the maximum stress appears onthe bolt. In the actual production, the frame is easy to rollover and bolt makes theframe fix. Therefore, the stress of bolt is the maximum.③Optimization results show that, compare with the results before the optimization,the stress distribution of the frame is more uniform. The maximum stress from12.428Mpa increased to14.483Mpa, but it still less than the allowable stress[]4060Mpa. The quality from225.7kg reduced to179.4kg, the weight reducedby20.5%. Therefore, the optimized frame meets the design requirements. |
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