NSK: Patent Issued for Grinding Machine and Grinding Method
Resource from: 4 Traders Likes:236
Jun 23,2015
By a News Reporter-Staff News Editor at Journal of Engineering -- NSK LTD. (Tokyo, JP) has been issued patent number 9050703, according to news reporting originating out of Alexandria, Virginia, by VerticalNews editors.
The patent's inventor is Nishide, Takashi (Kanagawa, JP).
This patent was filed on June 22, 2012 and was published online on June 9, 2015.
From the background information supplied by the inventors, news correspondents obtained the following quote: "Conventionally, in a process of manufacturing various kinds of workpiece, such as a bearing ring (inner ring, outer ring), grinding on an inner diameter portion of a workpiece (e.g., inner ring) or grinding on a raceway groove of another workpiece (e.g., outer ring) is performed. Various proposals have been made in connection with such a grinding technique (see, e.g., Patent Document 1).
"According to a conventional grinding technique, when setting a positional relationship between a grinding wheel and a workpiece at the time of, for example, switching workpiece settings, the workpiece is set on a spindle, and then a teaching operation is performed in which an infeed shaft is manually operated to bring the grinding wheel provided on the infeed shaft into contact with the workpiece. For example, the teaching operation with respect to the inner ring includes a manual operation of the infeed shaft to a position where the grinding wheel abuts (contacts) an inner diameter surface of the inner ring. Further, the teaching operation with respect to the outer ring includes a manual operation of the infeed shaft to a position where the grinding wheel abuts (contacts) the raceway groove of the outer ring."
Supplementing the background information on this patent, VerticalNews reporters also obtained the inventor's summary information for this patent: "Problem to be Solved by Invention
"However, the teaching operation (contacting operation) described above requires an experience, and workers engaging in the teaching operation are required to have high skill. Depending on an experience level of the worker, the teaching operation may take time, and the time required to switch the workpiece settings may be prolonged. As a result, it may hamper an improvement in efficiency of grinding of the workpiece.
"In addition, in the teaching operation, difference in grinding skill among respective workers may cause an error in the position at which the grinding wheel is brought into contact with the workpiece. Depending on the amount of error, the workpiece may not be ground accurately, which may result in a production of a defective product and a significant deterioration of a yield.
"The present invention has been made to solve the problems described above, and it is an object thereof to provide a grinding technique capable of shortening the time required to switch workpiece settings and capable of grinding a workpiece with high precision by bringing a grinding wheel into contact with the workpiece accurately.
"Means for Solving the Problem
"In order to achieve the above object, according to the present invention, a grinding machine includes a grinding wheel configured to grind a workpiece, and a grinding wheel control system configured to move the grinding wheel relative to the workpiece. The grinding machine includes a first control section configured to calculate and set a provisional grinding start position S0' of the grinding wheel relative to a first workpiece, with a center position of a support shaft supporting the grinding wheel being a reference, and based on a diameter ID of the first workpiece before grinding, a diameter WD of the grinding wheel, a grinding completion position S4 on the first workpiece after the grinding, and an actual grinding start position S0 of the grinding wheel relative to each of second and subsequent workpieces before grinding, a second control section configured to position the grinding wheel at the provisional grinding start position S0' that has been set by the first control section, a third control section configured move the grinding wheel relative to the first workpiece from the provisional grinding start position S0' to grind the first workpiece, and a fourth control section configured to fix the actual grinding start position S0 by moving the grinding wheel away from the first workpiece by a distance corresponding to S4, based on a gauge signal from an in-process gauge near the grinding completion position S4. The first control section is configured to set the provisional grinding start position S0' by a calculation, S0'=ID-WD-S4-S.alpha., in view of a predetermined allowance S.alpha. between the actual grinding start position S0 and the provisional grinding start position S0'.
"According to an aspect of the present invention, the in-process gauge is configured to measure the diameter of the first workpiece to detect a grinding condition of the first workpiece. The fourth control section is configured to fix the actual grinding start position S0 by moving the grinding wheel away from the first workpiece by the distance corresponding to S4, based on the gauge signal from the in-process gauge near the grinding completion position S4.
"According to as aspect of the present invention, the allowance S.alpha. is set in view of an error generated when arranging the grinding wheel to face the first workpiece to at the time of starting the grinding.
"According to as aspect of the present invention, when switching between a setting for a grinding of a certain workpiece and a setting for a grinding of a different workpiece, the fourth control section is configured to, in the grinding of the first workpiece at a beginning of the setting, moves the grinding wheel relative to the first workpiece from the provisional grinding start position S0' to grind the first workpiece, and moves the grinding wheel away from the first workpiece by the distance corresponding to S4, based on the gauge signal from the in-process gauge near the grinding completion position S4, to fix the actual grinding start position S0, and in the grinding of each of the second and subsequent workpieces after the switching of the settings, repeat a process of moving the grinding wheel relative to the workpiece from the actual grinding start position S0 to grind the workpiece, and moving the grinding wheel to actual grinding start position S0 based on the gauge signal from the in-process gauge near the grinding completion position S4.
"Advantages of Invention
"According to the present invention, a teaching operation of bringing the grinding wheel into contact with the workpiece becomes unnecessary, and the workpiece settings can be performed automatically. Therefore, it is possible to reduce the time required to switch the workpiece settings, and to grind the workpiece with high precision by accurately bringing the grinding wheel into contact with the workpiece. Consequently, according to the present invention, the grinding technique capable of reducing a production a defective product and having superior grinding efficiency can be achieved."
(4 Traders)
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1.The news above mentioned with detailed source are from internet.We are trying our best to assure they are accurate ,timely and safe so as to let bearing users and sellers read more related info.However, it doesn't mean we agree with any point of view referred in above contents and we are not responsible for the authenticity. If you want to publish the news,please note the source and you will be legally responsible for the news published.
2.All news edited and translated by us are specially noted the source"CBCC".
3.For investors,please be cautious for all news.We don't bear any damage brought by late and inaccurate news.
4.If the news we published involves copyright of yours,just let us know.
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