ويركزمعهد بحوثالعامة لليمينغ الصناعة الثقيلةفي مجال البحوث وتطوير التكنولوجيا المتقدمة والمنتجات الموجهة لصالح العملاء، فضلا عن بناءالقدرة التنافسية الجوهريةليجعل يمينغالصناعة الثقيلةرائدةفي هذه الصناعة.من خلال توفيرنتائج البحوثالأساسية، ويدعم المعهديمينغالصناعة الثقيلةالتكنولوجيا والمنتجات لتكون أعلىمنهافي العالمالقائمة.
معهد بحوثالعامة لليمينغ الصناعة الثقيلةهيقسم البحث والتطويرالأوليةللبحوثالتقنيةوالإدارة التقنية. وهي مسؤولة عنتطوير التكنولوجياالمطبقة علىيمينغجميع المنتجات، وإجراء البحوث الفنيةمقدمةعلى المنتجات الجديدةووضعالمعايير؛البحثالاهتزاز، والأثر، والضوضاء، والتكنولوجيا الهيدروليكية، والمطابقة الطاقةوتوفير الطاقة، والمواد الجديدة، وأنظمة التحكم، وخلق تكنولوجياتمبتكرة ومنتجاتحمليوبناءمنصة علىشبكة خاصةوعامةللتجاربوالاختباراتوذلك لتبادل التجربةالعامة ونتائج الاختبار.
Grinding is a key technology for difficulttomachine materials, eg, super alloys, ceramics, and composites The material removal behavior is dependent The motivation of this article is to present an effective online force control system for a large optical grinding machine A grinding force model was established Online force control of large optical grinding machine for brittle
Abstract Chatter that limits ground surface finish has been observed in the deterministic microgrinding of brittle optical materials In this article, the classical To reduce the work on the selection of grinding parameters and keep the grinding process stable, a new forcecontrolled grinding strategy for large optical Online force control of large optical grinding machine for brittle
1 Introduction Precision grinding of difficulttocut hard and brittle materials such as optical glasses, ceramics, cemented carbides, PVD hardcoatings or Ultraprecision grinding of optical glasses using monolayer nickel electroplated coarsegrained diamond wheels Part 1: ELID assisted precision Ultraprecision grinding of optical glasses using mono
The application of optical components fabricated by this method is limited to the infrared (IR) optics owing to the presence of highspatialfrequency surface grinding of hard and brittle materials After dressing, the application characteristics of coarsegrained diamond grinding wheels were examined by grinding optical glasses, Application potential of coarsegrained diamond grinding wheels
Smallscale aspheric optical elements have an urgent market demand and a wide range of applications With the development of science and technology and the increasing requirements on product quality, the polishing technology of small size aspheric optical elements is becoming much more important in the field of ultraprecision and cross grinding, on four different hardtomachine optical workpiece materials (Table 2) were used in the experiments The plungecut grinding experiments were replicated once The crossgrinding experiments were performed without a replication due to high setup times Fig 1 Engineered wheel with coarse grains to be flattened (a) andApplication potential of coarsegrained diamond grinding wheels
Ultraprecision grinding is primarily used to generate high quality and functional parts usually made from hard and difficult to machine materials The objective of ultraprecision grinding is to generate parts with high surface finish, high form accuracy and surface integrity for the electronic and optical industries as well as for astronomical As a flexible grinding method with high efficiency, abrasive belt grinding has been widely used in the machining of mechanical parts However, abrasive belt grinding has not been well applied in the field of ultraprecision optical processing, due to the lack of a stable and controllable removal function In this paper, based on the idea of Modeling and Experimental Verification of TimeControlled Grinding
Therefore, a Tongtai GT630 fiveaxis machine was used as the grinding machine in this study The frequency range, amplitude, and power of the builtin ultrasonic device in the tool spindle are 18–40 kHz, 02–2 μm, and 1000 W, respectively The ultrasonic technique is very useful for grinding brittle materialsSubstrate material of the samples was BK7 optical glass, and size of the samples was 100 mm diameter and 10 mm thickSome samples were ground by a crossgrinding machine using a 70 grit (250 μm) and a 120 grit (125 μm) diamond in bronze bonded wheel, respectivelyAnd some samples were ground by an MGK7120 × 6 parallel Relationship between subsurface damage and surface roughness of optical
Ductile regime grinding of glass and other brittle materials by the use of ultrastiff machine tools William J WillsMoren, Keith Carlisle, Patrick A McKeown, Paul Shore [1990] Center for Optics Manufacturing deterministic microgrinding Donald Golini, Walter C Czajkowski [1992] Computer simulation of loose abrasive grinding aspherical opticalDevelopments in precision optical grinding technology E Fess, M Bechtold, +1 author R Bechtold Published in Other Conferences 6 September 2013 Materials Science Optical systems that utilize complex optical geometries such as aspheres and freeform optics require precise control through the manufacturing processDevelopments in precision optical grinding technology
Energy and time savings are highly important aspects of green manufacturing Ultrasonic vibrationassisted grinding (UVAG) is a highefficiency, lowenergyconsumption processing method for optical components made from hard and brittle materials This work presents an experimental investigation of the specific grinding Ultraprecision grinding is primarily used to generate highquality, functional surfaces made of difficulttomachine materials, such as hard and brittle materials Through the multipoint cutting actions of ultrafine abrasive grains, ultraprecision grinding can generate parts with high surface finish, high form accuracy, and high Manufacturing technologies toward extreme precision
In modern manufacturing, precision machining has always been a crucial field As a representative of highprecision machine tools, optical projection grinding machines hold a unique position among numerous precision machining devices This article provides a detailed introduction to the machining precision, basic principles, applicable Highprecision rotary surface grinding machine A vertical rotary surface grinding machine for ultraprecision grinding of fragile materials such as optical glass, ceramics and ferrite, as well as the parts of various materials, using the unique mechanism of the table fixed typeVertical Spindle Rotary Surface Grinding Machine(Table Fixed)
As a conclusion, optical flow field measurements of the metalworking fluid flow in a running grinding machine are shown to be feasible For industrial grinding processes, the workpiece cooling by The experiments to evaluate the effects of the microstructured coarsegrained diamond wheels on the precision grinding of optical glass were conducted on a precision plane grinder from Hangzhou Machine Tool Group Co, Ltd, model “MUGK7120X5” The workpiece material was optical glass BK7Precision grinding of optical glass with laser microstructured
YIN S, OHMORI H, DAI Y, et al ELID grinding characteristics of glassceramic materials[J] Machine Tools & Manufacture, 2009, 49(3–4): 333–338 Article Google Scholar ZHAO Qingliang, CHEN Junyun, YAO Jun, et al ELID assisted grinding of optical glass with fine and coarse grained copperresin bonded diamond wheels[J]If a grinding process is used to machine the mold of hard and brittle materials, the ductile deformation would invariably leave characteristic grinding marks (Yang et al, 2009) If the critical depth of cut is exceeded in the machining process of the optical mold, subsurface cracks may be produced, caused by crack initiation and Advances in polishing of optical freeform surfaces: A review
Li SY, Wang Z, YL W (2008) Relationship between subsurface damage and surface roughness of optical materials in grinding and lapping processes J Mater model of the critical undeformed chip thickness for ductile–brittle transition in nanomachining of brittle materials International Journal of Machine Tools & Manufacture 64In this paper, focus is placed on ultraprecision grinding since for optical applications high accuracy and low surface roughness are required An extensive review of ultraprecision grinding has been provided by Brinksmeier In The possibility to machine even hardened materials is a main advantage of the technologyReview on Fabrication Technologies for Optical Mold Inserts
221 Research on Microscopic Material Removal Mechanism Song et al studied the effect of different polishing parameters on the material removal rate of spherical optical glass under the different radii of curvature through experimentsThe results show that when the spherical workpieces are polished with a smaller curvature radius, it After finishing the precision conditioning of monolayer nickel electroplated coarsegrained diamond wheels with 151 μm (D151), 91 μm (D91) and 46 μm (D46) grain size, resp, profile and surface grinding experiments were carried out on a fiveaxis ultraprecision grinding machine with BK7, SF6 optical glasses and Zerodur glass ceramicUltraprecision grinding of optical glasses using monolayer
