Precision Grinding for Functional Microstructured Surface
3.1 Precision Grinding of Microlens Array. In this study, two types of new designs are proposed as the surface of the glass substrate is plane and macro-freeform In this chapter, in view of the low processing efficiency and accuracy of hard-brittle material, a precision-trued V-tip diamond grinding wheel is proposed as the Precision Grinding of Micro-structures of Hard-Brittle
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Prediction and measurement for grinding force in wafer self
Comparing the experimental and theoretical results, the average errors of F x, F y and F z are severally 11.4%, 9.6% and 10.9%, indicating a good precision of the , F. Klocke (1) b,J.C. Aurich (1) c,P. Shore (2) d,H. Ohmori (2) e Add to Mendeley Cite https://doi/10.1016/j.cirp.2010.05.001 Get rights and content Abstract Ultra-precision grinding ScienceDirect
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Ultra precision grinding of spherical convex surfaces on combination
In this study, ultra-precision grinding of the non-rotational asymmetric biconical free-form optics with raster grinding path was studied. Firstly, a novel feeding This paper is in two parts describing the kinematic simulation of the grinding process. The first part is concerned with the generation of the grinding wheel surface. A Simulation of precision grinding process, part 1: generation
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Surface generation and materials removal mechanism in ultra-precision
The most common grinding methods include cross [15], parallel [16], tilted-axis [17], and wheel normal grinding [18] because of the differences in structure and the precision grinding technology to a new level through the multiple of thermal errors, taking gear form grinding process for research background, based on the formationResearch on High-Precision Form Grinding Technology
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A profile error compensation method in precision
profile accuracy of screw rotor. Therefore, precision form grinding is generally used as a finishing process in the manu-facture of screw rotors. Unfortunately, Wei J, Zhang G (2010) A precision grinding method for screw rotors using CBN grinding wheel. Int J Adv Manuf Technol 48(5–8):495–503. Article Google Scholar Wu Y-R, Fan C-W (2013) Mathematical modeling for screw rotor form grinding on vertical multi-axis computerized numerical control form grinder. J Manuf Sci Eng 135:051020A profile error compensation method in precision grinding
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(PDF) Profile error compensation in ultra-precision
grinding of micro aspherical surface: effects of tool errors on workpiece form accuracies and its compensation methods, Journal of the Japan Society for Precision Engineering 65 (1999) 401–405.The form accuracy of the workpiece finished by cutting and grinding is determined by the high-precision spatial motion trajectory of the ultraprecision machine tools. In theory, the accuracy of a workpiece surface cannot exceed that of the machine tools. In the 1970s, Rupp proposed the CCOS process .Manufacturing technologies toward extreme precision
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Fast registration of 3D point clouds with offset surfaces in precision
Because of its high sensitivity to misalignment, precision grinding of free-form surfaces with micron accuracy requires accurate registration of the surface measurement point cloud. Registration of point clouds obtained with a coordinate measuring machine (CMM) is generally an iterative process of finding optimal coordinate As to correction polishing technology, it was mainly applied in shape controlling of free-form surfaces [15,16]. However, ultra-precision grinding is still the main processing technique for hard and brittle material optical elements demanding micron-scaled profile accuracy and nanometer-scaled surface roughness [17–21].Ultra precision grinding of spherical convex surfaces on combination
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Profile error compensation in precision grinding of ellipsoid
A high efficiency precision truing experiment for arc-shaped diamond grinding wheel is carried out on ultra-precision grinder NAS520X-CNC, the experimental setup is shown in Fig. 10.The parameters of the dressing experiments are shown in Table 2.In order to improve the truing efficiency, a 180# GC wheel was chosen to dress duced by the grinder feed motion on the machined rotor ge-ometry, Wu et al. established the relationship between the motion parameter of the screw rotor profile and the machine setting parameters of the vertical form grinder based on the structure of the five-axis form grinder [17]. Further, Zhoupre-compensation method for profile errors of screw
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The core benefits for precision grinding PES Media
A frequency-controlled motor spindle is used for external and internal grinding, while a C-axis for the machine’s workhead enables precision form and thread grinding. In addition, the machine’s tool table features an integrated double T-slot to accommodate dressing devices. The S31 allows the highest standards of precision Diamond turning, fly-cutting, and milling are the primary manufacturing technologies for generating free-form surfaces; however, they are not sufficiently effective in machining free-form optics on hard and brittle materials.Ultra-precision grinding has been demonstrated to have an outstanding capability in machining difficult-to-cut materials. . Surface generation and materials removal mechanism in ultra-precision
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Fabrication of small aspheric moulds using single point inclined
Section snippets Set-up and characteristics of single point inclined axis grinding mode. As shown in Fig. 1(a), in conventional perpendicular arc envelope grinding, the wheel spindle is parallel to Y-axis, while the workpiece spindle is parallel to Z-axis.Because the rotational axis of the grinding wheel is perpendicular to that of the work The grinding of aspheric moulds was performed on a 4-axis ultra-precision machine tool (NACHI, ASP005P), as shown in Fig. 1(a). The work spindle of this machine can linearly move along Z-axis at a positioning resolution of 1 nm and Y-axis at a resolution 100 nm. The grinding spindle is installed on a rotary table (B-axis). Its rotationalProfile error compensation in ultra-precision grinding of
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(PDF) Precision grinding for rapid fabrication of
A 3-axis ultra precision free-form grinder is under development at Cranfield University. The machine will generate large optics with high form accuracy, at high material removal rates and with lowGrinding marks are regard as a great obstacle to manufacture spherical and aspheric surfaces with higher surface quality, lower energy and wastage. The scallop-height was studied for optimizing the grinding parameters firstly to reduce its effect on grinding marks. Secondly, the expression of grinding points distribution was established Grinding marks on ultra-precision grinding spherical and aspheric
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A study of precision grinding of micro-pitch internal thread
1 天前Section snippets PRSM nut samples. The grinding experiments were carried out on the nut of a standard PRSM RV 20, as shown in Fig. 3. The nut has a right-handed cylindrical internal thread with a straight profile, with a pitch of 1 mm, a nominal diameter of 32.5 mm, and a thread angle of 90°.Fig. 5 shows ground sample, Fig. 6 shows measured results of form profile map recorded by a Zygo GPI-XP interferometer. For the concave lens, The rms micro-roughness and p–v form deviation were reduced to 56 nm and 0.58 μm, respectively.While for the convex lens, p–v form deviation was reduced to 0.68. μm, the rms micro ELID precision grinding of large special Schmidt plate for
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Development of a longitudinal-torsional ultrasonic
Grinding wheel dressing is the key to achieving precision form grinding of GCr15 bearing rings. However, the low dressing accuracy and poor dressing quality of grinding wheels using conventional roller dressing (CRD) are problems that need to be solved urgently. A longitudinal-torsional ultrasonic-assisted roller dressing (LTUARD) The machining of free-form surfaces is performed on an ultra-precision grinding machine (Moore Nanotech 450UPL). The grinding machine makes use of a rotational table (B axis) to hold the wheel spindle and the workpiece is mounted on an air bearing, in which the workpiece spindle is rotated and fed over a high-speed spinning Optimization of Tool Path for Uniform Scallop-Height in Ultra-precision
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Profile error compensation in cross-grinding mode for large
This study proposes a high-precision compensation system using an on-machine noncontact measuring system to improve the manufacturing accuracy and efficiency of large-diameter aspheric mirrors by reducing profile errors arising from tool setting errors and machine positioning errors. By measuring a standard hemisphere, the 2 天之前want to get the grinding job over and done with very quickly as it can be unpleasant in the long run. The operator therefore tends to lean heavily on the tool, pressing it against the work surface in the belief that it will grind more effectively. Up to a point, it does. Up to the limit of the tool’s dimen-sioned power.Pocket Guide to Grinding Technique Atlas Copco
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Affecting factors, optimization, and suppression of grinding
Grinding process is one of the important methods to realize precision surface for many high-strength, toughness metal materials and hard brittle non-metal materials [1,2,3,4,5,6,7].It has been widely used in manufacturing key parts in aerospace, astronomy, biomedicine, optics, and other fields [8,9,10,11,12,13,14].For hard and brittle
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