JPS62136352A - Method of machining bearing guide surface - Google Patents

Abstract

PURPOSE:To improve grinding work efficiency by driving a table of a grinding machine by means of a linear motor, performing grinding work by making the table vibrated in perpendicular directions caused by the variation in the feeding speed of the table, and performing elastic fluid lubrication process on a rugged surface formed by the grinding. CONSTITUTION:When a table 5 of a surface grinder is driven with a linear motor 13 to perform grinding work with a grindstone on a workpiece W fixed with a magnetic chuck 7, the table 5 vibrates due to the variation in the feeding speed of the table in the directions perpendicular to the table feed to cause a phenomenon of forming a rugged surface on the ground surface. This ruggedness consists of a large ruggedness Wa and smaller ruggedness Wb. When the speed is small, a distance between the rugged surfaces Wa becomes narrower as Wd and when the speed is great, the distance becomes wider as Wc. On the other hand, ruggedness Wb is caused by the variation in the torque of the torque motor 13. An elastic fluid lubrication process is then applied on the rugged surface of the workpiece W. Thus, a bearing guide surface can be ground easily and accurately within a short period of work time without the need for scrapping work.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a method for machining a bearing guideway surface, and more specifically, the present invention relates to a method for machining a bearing guideway surface, and more specifically, a method for machining a machined surface of a workpiece by only grinding using speed fluctuations of a linear motor. The present invention relates to a bearing inner surface machining method in which unevenness is created and an elastohydrodynamic lubrication treatment is applied to the uneven surface.

[Prior art] Conventionally, the method of machining a bearing guideway is to perform a normal grinding process on the machined surface of the workpiece, and then apply a process called "scraping" to the machined surface of the workpiece. After creating an uneven surface, an elastohydrodynamic lubrication treatment was applied to the uneven surface.

[Problems to be Solved by the Invention] However, in the conventional bearing guideway machining method, the work is time consuming and requires a high level of skill. In addition, since the "scraping" process in particular is a manual process, the machined surface of the workpiece becomes an irregularly uneven surface, and the finishing accuracy due to elastohydrodynamic lubrication after the "scraping" process is also low.

The purpose of the present invention was proposed in order to solve the problem in view of the above circumstances, and the purpose of the present invention is to vibrate the table in a direction perpendicular to the feed direction by speed fluctuation of a linear motor, thereby performing only grinding processing. tt iJ A bearing guide surface machining method is provided in which unevenness is created on the machined surface of the Nichio product to achieve a high-precision finish.

[Means for Solving the Problem] In order to achieve the above object, the present invention drives a table in a grinding machine with a linear motor, and moves the table in an orthogonal direction perpendicular to the feed direction by speed fluctuations in the feed rate of the table. The grinding process is performed on a workpiece placed on a table by vibrating the workpiece, and then an elastohydrodynamic lubrication process is applied to the uneven surface formed on the machined surface of the workpiece.

[Operation] According to the present invention, the grinding machine (pulling table) is driven by a linear motor to perform grinding on the processing surface of the workpiece.
[In this case, the table moves in an orthogonal direction perpendicular to the table feeding direction due to fluctuations in the table feeding speed. If the table feed rate has a small variation, a narrow and shallow ground surface will result, and if the table feed rate has a large variation, a wide and deep ground surface will result. As a result, a larger uneven surface and a smaller uneven surface are generated on the machined surface of the workpiece, and then by not applying elastohydrodynamic lubrication treatment to the uneven surface, the smaller uneven surface is scraped off to create a bearing guide surface with high precision. can be finished.

[Example] Hereinafter, an example of the present invention will be described in detail based on the drawings.

FIG. 1 is a schematic front view of the surface grinder 1, and the base 3
A table 5 is placed on top, and the table 5 is moved in the left-right feeding direction as shown by the arrow in FIG. A magnetic chuck 7, which is a magnetic member for fixing the workpiece, is placed on the table 5, and the workpiece W is fixed on the magnetic chuck 7. A grindstone 11 attached to a grindstone head 9 facing downward is rotated by a drive device (not shown), and a predetermined grinding process is performed on a workpiece W fixed on a magnetic chirek 7. In addition, surface grinder 1
The grindstone 11 is not particularly unusual, and may be a conventionally used one.

As shown in FIG.
It is guided by a guide surface 15 formed on the surface of the paper and is moved in the left-right feeding direction in FIG.

As is clear from FIGS. 1 and 2, the surface grinder 1
When the table 5 is driven by the linear motor 13 to perform grinding on the workpiece W, the table 5 vibrates in a direction perpendicular to the feed direction due to speed fluctuations in the feed rate of the table 5, causing the workpiece W to be machined. A phenomenon occurs in which the surface becomes uneven as shown in FIG.

As shown in FIG. 3, the uneven surface is composed of a larger uneven surface Wa and a smaller uneven surface Wb. The larger uneven surface Wa is caused by vibration in the orthogonal direction (Y direction) orthogonal to the feed direction, which is the left-right direction (Y direction) in FIG. 3, due to a 7 degree change in the feed speed of the table 5.

If the speed fluctuation of the feed rate of table 5 is small, the third
As shown in the figure, when the machined surface Wd of the workpiece W becomes narrow and shallow and the speed fluctuation is large, the machined surface Wd of the workpiece W becomes narrow and shallow.
C becomes wider and deeper. The machined surface Wc of such a workpiece W
, Wd, the relationship between the speed fluctuation and the uneven surface is as shown in FIG.

Therefore, as the speed fluctuation of the feed rate of the table 5 increases, the uneven surface becomes larger.

The smaller uneven surface Wb is caused by torque fluctuations of the linear motor 13.

Above) As a means to increase the speed fluctuations in the feeding speed of the double 5, in controlling the linear motor 13, etc., a small speed fluctuation Vd is caused at the maximum constant speed of the speed command diagram shown in FIG. This is done by stirring or applying a speed loop. In addition, as a mechanical means, for example, in the case of a linear pulse motor, this is accomplished by increasing the pitch and decreasing the girdle so as to greatly increase the torque fluctuation.

The above processing method results in a machined surface of the workpiece W as shown in Fig. 3, but since it cannot be used as a bearing guide surface in that state, normal elastohydrodynamic lubrication is further performed to create a smaller uneven surface Wb. By removing this, the bearing guideway can be finished with a high opening.

[Effects] As can be understood from the description of the above embodiments, according to the present invention, a table in a grinding machine is driven by a linear motor, and the table is moved in the feed direction by speed fluctuations in the feed rate of the table. The workpiece placed on the table is vibrated in orthogonal directions to perform grinding, and then elastohydrodynamic lubrication is applied to the uneven surface of the workpiece. The "sage" processing can be removed. Therefore, the machining method of the present invention can shorten the working time, and even an unskilled worker can accurately machine the bearing guide surface. Furthermore, the uneven surface formed after the grinding process becomes more precise and the effect of elastohydrodynamic lubrication can be enhanced, resulting in the effect that the bearing guide surface can be finished with high viscosity.

[Brief explanation of drawings]

FIG. 1 is a schematic front view of a surface grinder. FIG. 2 is a partially sectional perspective view illustrating table feeding. FIG. 3 is an enlarged plan view of a workpiece processed by the processing method of the present invention. Figure 4 shows the speed fluctuation of the table feed speed and the difference) 1111
2 is a diagram illustrating the relationship between the degree of unevenness on the processed surface of the object and the degree of unevenness. FIG. 5 is a speed command diagram of the beam near motor. 1...Surface grinder 5...Table 7...Magnetic chuck 11...Wheelstone 13...Linear motor representative Patent attorney Yasuo Miyoshi] Mi;1---1 in Figure 1 Figure 2 Figure 3 X W Sleeve 4 Figure 1 vvr Figure 5

Claims (1)

[Claims] A table in a grinding machine is driven by a linear motor, and the table is vibrated in a direction perpendicular to the feed direction by speed fluctuations in the feed rate of the table, and a workpiece placed on the table is ground. A bearing guide surface machining method characterized by applying elastohydrodynamic lubrication treatment to an uneven surface generated on a machined surface of a workpiece.