Papers by Keyword: Profile Error

Abstract: The profile error of the gear surface of worm produces a great impact to gear characteristic. So, it is necessary to calculate the profile error of the gear surface. In order to develop the manufacturing accuracy of the complex tooth surface of the worm pair, a method to measure the error of the worm was designed in this paper. The profile error of the worm can be calculated based on geometrical operation. To meet the need of quality-controlling and the intelligent machining, the 3-D measuring technology method was adopted to measure the surface of the worm. And through the calculation, analysis and reconstruction, the real outline of the worm pair is redrew. A whole theoretical solid model of worm’s meshing surface with grid can be obtained based on the mathematical modeling. And it is possible to give the data of the recorrection and the feedback by analysing the profile error.

Abstract: This paper elaborates on all kinds of existing methods of computing profile error, on account of integrated comparison of all good and bad points, in the context of consistent benchmark for testing and processing, forming the definition of profile error, the article also analyses and proposes a new algorithm which is counting the minimum distance of two profile lines which are least containing the tested profile and paralleling to the academic profile as profile error, and that is the method of counting polar radius error. The experimental results indicate that this method has effectively improved the accuracy and efficiency of computing the profile error of scroll wrap, and it’s suitable to the High-Accuracy measurement and evaluation of scroll.

Abstract: The profile error of a globoidal cam, resulting from rotational deviation of the location of the part in machining on a NC machine tool which has two coordinated rotational axes, is studied. A novel method of solving profile error is presented. According to this method, the minimum distance from a point on the profile actually machined to the desired profile is referred to as the profile error. Then, the mathematic model of profile error resulting from the rotational deviation of the part to be machined is built. After that, the type TC40 globoidal cam is employed as an example to solve the machining error. And the experiment of machining a globoidal cam is done. The experimental result is compared with the computed result, and they are mostly identical.

Abstract: The profile error of a globoidal cam resulting from motion errors of two coordinated rotational axes of a machine tool in machining is studied. A novel method of solving profile error is presented. According to this method, the minimum distance from a point on the profile actually machined to the desired profile is referred to as the profile error. Then, the mathematic model of profile error resulting from the motion errors of the machine tool is built. After that, the type TC40 globoidal cam is employed as an example to analyze the machining error. The linear influence coefficients of the motion errors of the two coordinated rotational axes on the profile error are determined. The maximum value of the machining errors resulting from the motion errors of the two rotational axes of machine tool is yielded. A novel method of improving the velocity of solving the maximum value by using the linear influence coefficient is presented. At last, an isogram is introduced to analyze the influence of the motion errors of the two coordinated rotational axes of the machine tool on the globoidal cam profile error.

Abstract: This paper introduces a method for solving theoretical curve of rectangle spline hob by using the analytic method. The tooth profile and tooth profile envelope diagram have been simulated by using Matlab software, and the effects of numbers of hob cutting edges on the workpiece edges degrees errors has been analysed. Simulation results show that this method can select a reasonable number of groove according to the requirements of target accuracy, which can improve the design accuracy and design efficiency of the hob.

Abstract: As the consumer market in the optics, electronics and aerospace industries grows, the profile accuracy demand for ultra-precision flat, spherical and aspheric optical surface micro-lens increases. Previous studies have found that machine system accuracy, tool alignment error and tool radius measurement error impact greatly on the profile accuracy of the machined surface. In this paper, we developed a grinding system based on the ultra-precision diamond lathe, presented a unified mathematical model of effects of all the geometric errors to the shape error by using the multi-body system theory. Aiming at the main source of profile error, the practical mathematical model is derived, and their propagation coefficients to profile error are calculated. By means of simulation analysis and grinding experiments of spherical part of tugnsten carbide, we conclude that the radial tool alignment error is the main influencing factor for the profile error of spherical surface; while tool radius measurement error influence the radius of sphere only.

Abstract: The involute cam is used for generating tooth form of an involute gear in gear grinder with involute cam-link stopper, and its profile error is one of the factors which decide the tooth form precision of gear. The conventional processing means of involute cams can't achieve a sufficient accuracy. In this paper, a double-disc mode grinding device is introduced. Based on analysis of grinding principle, the device's structure and working process are described, and the main sources of grinding profile errors are analyzed. It is confirmed that the introduced device has the ability of accomplishing a highly precise grinding of involute cams.

Abstract: This study presents the development of an ultra-precision grinding system based on a new grinding technique called the “In-Process Grinding Method (IPGM)”. IPGM which is used for grinding aspheric lens increases both the production and grinding performance, and significantly decreases total production costs. To enhance the precision grinding productivity of ultra-precision aspheric lens, we present here an ultra-precision grinding system and process for the aspheric micro-lens. The tool path was calculated and CNC program generation and tool path compensation were performed for aspheric lens. Using this ultra-precision grinding system, aspheric lens, 4mm in diameter, were successfully performed. The profile error after the first grinding without any compensation was less than 0.6μm, and surface roughness Ra was 0.01μm. In-process grinding was performed with compensation. Results of the profile accuracy P-V 0.3μm and surface roughness Ra 0.006 μm were obtained.