JPH0329095Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a dresser used for dressing a grinding wheel of a double-head surface grinder.

BACKGROUND TECHNOLOGY As shown in FIG. 2, for example, the above-mentioned double-head surface grinder has a main body frame 1 with a pair of sleeves 2 and 3 disposed coaxially and vertically facing each other, and an appropriate drive mechanism (not shown). ) is supported so as to be movable in the vertical direction via a worm or the like, and spindles 6 and 7 which are rotatably driven by grindstone drive motors 4 and 5 are rotatably supported in both sleeves 2 and 3. , 7, respectively, are attached with grinding wheels 8 and 9 with their grinding surfaces facing each other, and a carrier plate 10 is provided between the two grinding wheels 8 and 9 and is rotatably driven in a plane orthogonal to the grinding wheel axis. The outer circumferential part of the workpiece is inserted between the two grinding wheels 8 and 9, and a work piece is carried between the rotating grinding stones 8 and 9 by means of a carrier plate 10, and both sides of the work piece are inserted between the two grinding stones 8 and 9. It is configured so that the grinding process is carried out at the same time.

By the way, in the above-mentioned double-head surface grinder, if the grinding wheels 8 and 9 are used for a long period of time or the grinding conditions of the grinding wheels 8 and 9 are inappropriate, the grinding surfaces of the grinding wheels 8 and 9 may become clogged or clogged. This results in poor sharpness, increased heat generation, and grinding cracks and grinding burns on the finished surface.

Therefore, when the grinding surfaces of the grinding wheels 8 and 9 become crushed or clogged, the worn abrasive grains on the upper layer of the grinding surface and the chips clogged in the gaps or pores between the abrasive grains are removed and the grinding surfaces are cleaned. It is necessary to perform a dressing operation to expose the new abrasive grains.

Usually, the above-mentioned dressing work is performed, for example, in Figures 2 and 3.
This is carried out using a dresser 11 as shown in the figure. This dresser 11 has diamond tools 14 and 15 protruding from the top and bottom of the tip of a dressing arm 13 which is mounted on a main body frame 1 so as to be swing-driven in a plane perpendicular to the grinding wheel axis by a dressing arm drive motor 12. By swing-driving the dress arm 13 and inserting the diamond tools 14 and 15 between the rotating grinding wheels 8 and 9 and moving them in the radial direction of the grinding wheels 8 and 9, the upper layer of the grinding surfaces of the grinding wheels 8 and 9 is removed. Scrape off the worn out abrasive grains or clogged chips, and turn the grinding wheel 8.
New abrasive grains were exposed on the grinding surface of No. 9.

Problems to be Solved by the Invention By the way, in the dressing work using the dresser 11, since the rotational speed of the grinding wheels 8 and 9 is constant, there is a peripheral speed difference on the grinding surfaces of the grinding wheels 8 and 9. Therefore, the abrasive grains of the grinding wheels 8 and 9 and the diamond tools 14 and 15 of the dresser 11 collide at different speeds, making it impossible to uniformly dress the entire grinding surface of the grinding wheels 8 and 9. However, there were many cases where accuracy was not achieved. For example, the shape after dressing should be a plane perpendicular to the grinding wheel axis as shown in FIG. 4, but it becomes an inclined surface with respect to the plane perpendicular to the grinding wheel axis as shown in FIG. 5. This is because as the diamond mode tools 14 and 15 move toward the inner diameter side of the grinding surfaces of the grinding wheels 8 and 9, dressing resistance is applied to the abrasive grains of the grinding wheels 8 and 9 because the peripheral speed on the grinding surfaces of the grinding wheels 8 and 9 is slow. This is because more than necessary will be removed.

Means for Solving the Problems In view of the above-mentioned problems, this invention has a dressing arm that is inserted between the grinding wheels that rotate the diamond tool and moves it in the radial direction of the grinding wheels. A dresser for a double-head surface grinder that dresses a grinding wheel is equipped with a grindstone rotation speed detector that detects the rotation speed of the grindstone and a dress arm position (angle) detector that detects the position (angle) of the dressing arm. A rotation speed detector detects the rotation speed of the grinding wheel, a dressing arm position (angle) detector detects the position (angle) of the dressing arm, and a diamond tool detects the diameter of the grinding wheel being dressed. To provide a dresser for a double-head surface grinder, which calculates the circumferential speed of a grindstone based on a detected value and feeds back the circumferential speed to a grindstone drive motor so that the circumferential speed becomes constant.

Function: This invention uses the above-mentioned means to perform dressing work at a constant circumferential speed regardless of the difference in circumferential speed between the inner and outer diameters of the grindstone.

Embodiments Hereinafter, embodiments of this invention shown in the drawings will be described.

FIG. 1 is a longitudinal cross-sectional view of a double-head surface grinder equipped with a dresser according to this invention, and the same reference numerals as in FIG. 2 indicate the same or similar contents as in FIG. 3, and the explanation thereof will be omitted.

In FIG. 1, reference numerals 16 and 17 are grindstone rotation speed detectors such as rotary concorders for detecting the rotation speed of the grindstones 8 and 9 during dressing. 19 is attached to the main body frame 1. A dress arm position (angle) detector 20, such as a resolver, detects the position (angle) of the dress arm 13 of the dresser 11 during dressing, and is attached to the lower end of the drive shaft 21 of the dress arm 13, for example.

Next, the dressing operation in the above configuration will be explained. The grindstones 8 and 9 are rotationally driven by the grindstone drive motors 4 and 5, and the dress arm 13 is swing-driven by the dress arm drive motor 12, and the diamond tools 14 and 15 are rotated by the grindstones 8 and 9.
Dressing of the grinding surfaces of the grindstones 8 and 9 is started by inserting the grindstones between them. At this time, as the dressing arm 13 swings, the dressing arm position (angle) detector 20 detects the position (angle) of the dressing arm 13, and the diamond tools 14, 15 detect the diameter of the grinding wheels 8, 9 being dressed. Calculate D. In synchronization with this, the diameter D of the grinding wheels 8, 9 and the rotation speed N of the grinding wheels 8, 9 are detected by the grinding wheel rotation speed detectors 16, 17. Find the peripheral speed v. That is, the following equation holds true for the circumferential speed v of the grindstones 8 and 9.

v=πDN By the way, in the above dressing work, the grindstones 8 and 9
To achieve uniform dressing over the entire grinding surface of
It is desirable that the circumferential velocity v be constant. Therefore, in order to keep the circumferential speed v constant, it is necessary to keep DN constant, and the diamond mode tools 14 and 15 advance on the grinding surfaces of the grinding wheels 8 and 9 toward the inner diameter side so that the circumferential speed v becomes constant. Accordingly, the number of rotations N of the grinding wheels 8, 9 is calculated from the diameter D of the grinding wheels 8, 9 during dressing, and the calculation result is immediately fed back to the grinding wheel drive motors 4, 5 in order to keep DN constant. be.

Effects of the invention According to this invention, dressing work can always be performed at a constant circumferential speed regardless of the circumferential speed difference between the inner and outer diameters of the grindstone, so the grinding surface of the grindstone can be dressed accurately on a plane perpendicular to the grinding axis. It is possible to improve the machining accuracy of the workpiece.

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram showing the dresser of a double-disc surface grinder according to this invention, Fig. 2 is a schematic diagram showing the dresser of a conventional double-disc surface grinder, and Fig. 3 is taken along line A-A in Fig. 2. Drawings in Figures 4 and 5
The figure is an enlarged sectional view of a grindstone that has been dressed by a dresser. 16, 17... Grinding wheel rotation speed detector, 20... Dress arm position (angle) detector.

Claims (1)

[Scope of utility model registration request] In the dresser of a double-head surface grinder that dresses the grinding surface of a grinding wheel, the number of rotations of the grinding wheel can be increased by inserting the diamond tool between the rotating grinding wheels using the dressing arm and moving it in the radial direction of the grinding wheels. It is equipped with a grindstone rotation speed detector to detect the rotation speed of the grindstone and a dress arm position (angle) detector to detect the position (angle) of the dressing arm. The position (angle) of the dressing arm is detected by the angle) detector, the diameter of the grinding wheel being dressed is detected by the diamond tool, and the circumferential speed of the grinding wheel is calculated from these detected values, and the circumferential speed is kept constant. A dresser for a double-headed surface grinder characterized by feedback to the grinding wheel drive motor.