JPH0511959Y2 - - Google Patents

Description

[Detailed description of the invention] (Industrial application field) The present invention performs truing dressing by bringing the lower surface of a rotating grinding wheel for truing dressing into contact with the upper surface of a rotating grinding wheel whose upper surface is the polishing surface. This invention relates to a rotary truing dressing device.

(Prior art) As a truing dressing device for a grinding wheel, as seen in Japanese Patent Application Laid-Open No. 53-4283,
There are those in which the dresser uses a buffering means such as a spring or air, and as seen in Japanese Patent Application Laid-Open No. 54-61386.
There is a known one in which free abrasive grains are fed between a metal parallel disk and a grindstone.

(Problems to be Solved by the Invention) However, in the former method using a buffer means, the pressing force fluctuates during truing dressing, and it is particularly difficult to achieve truing accuracy. On the other hand, with the latter type, which uses free abrasive grains, it is difficult to pour the free abrasive grains evenly, making it difficult to achieve accurate flatness, and it is necessary to remove the grinder from the grinder each time when dressing.
There is also the problem that the work is time-consuming and dimensional errors occur each time the device is attached or detached. Therefore, a rotary grindstone for truing dressing is installed above one side of the rotary abrasive wheel of a surface grinding machine, and when necessary, the rotary whetstone can be lowered to polish the lower surface of the rotary abrasive wheel without removing the rotary abrasive wheel. It is possible to perform truing dressing by pressing it against the surface, but since rotary abrasive wheels often have the required slope on the polishing surface, the rotary whetstone must be able to adjust its levelness. However, since the mechanism is complicated, no practical device has been developed yet.

(Means for Solving the Problems) The present invention relates to a truing dressing device for a rotary abrasive wheel that solves the above-mentioned problems. A rotary truing dressing device that performs truing dressing by bringing the lower surface of a rotary grindstone for shinging into contact,
The rotating whetstone is supported by a whetstone holder that has an upper flange whose lower surface is a spherical seat and a lower flange with a plurality of adjustment bolts screwed upward into the lower end surface, and the whetstone holder is driven by a motor. It is loosely fitted into an elevating bracket that is moved up and down slightly by a driven feed screw type elevating device, and is supported by the spherical seat formed at the upper end of the elevating bracket, while supporting the lower end surface of the elevating bracket. The grindstone is characterized in that the horizontality of the rotary grindstone can be freely adjusted by bringing it into contact with the upper end surface of the adjustment bolt.

(Function) Such a truing dressing device for a rotary abrasive wheel is installed above the rotary abrasive wheel of a polishing device such as a surface grinder, and when the rotary abrasive wheel wears out, it is raised and lowered by a motor. When the elevating bracket is slightly lowered by operating the feed screw of the device, it is loosely fitted into the elevating bracket and the spherical seat of the upper flange is supported by the spherical seat of the elevating bracket, and the upper end of the adjustment bolt is moved under the elevating bracket. Since the rotating grindstone also descends via the grindstone holder that is in contact with the end face, the lower surface of the rotating grindstone comes into contact with the polished surface of the rotary abrasive wheel, and truing dressing is performed in a so-called forced cut method. and,
The levelness of the lower surface of the rotating whetstone can be adjusted by changing the amount of protrusion of the adjustment bolt.As mentioned above, the whetstone holder is loosely fitted into the lifting bracket and the upper end is supported by the spherical seat and the spherical catch. Not only when the polishing surface of the rotary polishing wheel of the apparatus is flat, but also when the polishing surface has a shallow mountain-shaped or valley-shaped cross section, the desired angle corresponding to the polishing surface of the rotary polishing wheel can be set accurately.

(Example) Next, the present invention will be described in detail using the illustrated polishing apparatus as an example.

Reference numeral 1 denotes a box-shaped machine base, and on its slanted upper plate 2, a rotary abrasive wheel 3 such as a metal bonded whetstone using super abrasive grains such as cubic boron nitride or diamond is installed, and its upper surface is polished. It is installed as. Reference numeral 4 denotes a workpiece loading/unloading device attached to the machine base 1 via a support 5, and a workpiece holding mechanism 7 that holds and rotates the workpiece is attached to its horizontally swingable swinging arm 6. The workpiece holding mechanism 7 can be moved intermittently by the workpiece loading/unloading device 4 from a workpiece supply position to a processing position above the rotary abrasive grindstone 3 and to a carryout position. Reference numeral 8 denotes a pressurizing force regulator attached to the workpiece holding mechanism 7, and the pressurizing force regulator 8 moves the workpiece holding mechanism 7 up and down so that the machining pressure of the workpiece changes between the initial stage of polishing and the final stage of polishing. A higher processing pressure is applied to the workpiece at the beginning of polishing than at the end of polishing, and the workpiece is rough-cut to near the specified dimensions in a short time.
At the end of the polishing process, the processing pressure is reduced to achieve precision finishing with high finishing and dimensional accuracy.

9 is a rotary grindstone 9 at the lower end on one side of the rotary polishing whetstone 3.
The truing dressing device of the present invention is mounted on the side wall of a machine base 1 so as to be movable up and down via an elevating device 10 so as to face the truing dressing device 9. The polishing surface on the upper surface of the rotary abrasive grindstone 3 can be dressed horizontally with high precision, or if the polishing surface has a conical recess or conical convexity, it can be dressed in a shape having an inclination thereto. That is, the rotary grindstone 9a of this truing dressing device 9 is a grindstone equipped with an upper flange 18 whose lower surface is a spherical seat 19, and a lower flange 20 with three adjustment bolts 21 screwed upward into the lower end surface. The grindstone holder 17 is supported by a lifting bracket 15 which is slightly raised and lowered by a feed screw 10a of the lifting device 10.
The spherical seat 16 formed at the upper end of the elevating bracket 15 is loosely fitted with a fine gap 22 left between the elevating bracket 15 and the spherical seat 19 to be tiltably supported by the adjusting bolt. It is brought into contact with the upper end surface of 21. Note that 11 is a motor that drives the rotary abrasive grindstone 3, 12 is a motor that drives the rotating work holding mechanism 7, and 13 and 14 are motors that move the rotary truing dressing device 9 up and down and rotate it.

With this configuration, the workpiece holding mechanism 7 of the workpiece loading/unloading device 4 attached to the machine base 1 is stopped at the workpiece supply position to hold the workpiece, and the workpiece holding mechanism 7 is The workpiece is moved to above the rotary polishing wheel 3, which is the processing position, and stopped, and the pressing force regulator 8 of the workpiece holding mechanism 7 is operated to press the rotating workpiece against the rotary polishing wheel 3 at a predetermined pressure to perform polishing. .

As the polishing process continues in this way, if the polishing surface of the rotary polishing wheel 3 is worn out in accordance with the number of times the workpiece is polished, the polishing surface of the rotary polishing wheel 3, which is separately installed above the machine stand 1, is worn while the polishing process described above continues. When the feed screw 10a of the rotary truing dressing device 9 is rotated by the drive of the motor 13 and the lifting bracket 15 is slightly lowered, the spherical seat 19 of the upper flange 18 is loosely fitted into the lifting bracket 15. is supported by the spherical catch 16 of the lifting bracket 15, and the upper end of the adjustment bolt 21 is attached to the lifting bracket 1.
Since the rotary whetstone 9a also descends via the whetstone holder 17 which is in contact with the lower end surface of the rotary abrasive wheel 5, the lower surface of the rotary whetstone 9a comes into contact with the polishing surface of the rotary abrasive wheel 3, resulting in a truing in the so-called forced cut method. Ressing is performed. The levelness of the lower surface of the rotary grindstone 9a can be adjusted to correspond to the shape of the polishing surface of the rotary abrasive wheel 3 by changing the amount of protrusion of the adjustment bolt 21, so that the grindstone holder 17 is loosely fitted into the lifting bracket 15 as described above. Since the upper end is supported by the spherical seat 16 and the spherical seat 19, it can be held horizontally or at a desired angle with a simple operation.

(Effects of the invention) As is clear from the above description, the present invention allows the leveling of the rotating grindstone for truing dressing to be adjusted to an angle that corresponds to the shape of the polishing surface of the rotating grinding wheel with a simple operation. In addition to being able to cancel out dimensional errors when installing the rotary abrasive wheel,
Dressing the polishing surface of a rotary polishing wheel not only horizontally but also in a slightly inclined chevron cross section to eliminate insufficient polishing that occurs on the polished surface of a workpiece whose central part is concave, or conversely, It is also possible to make the central part of the polished surface of the workpiece into a conical convex shape by dressing it in a slightly slanted cross-sectional valley shape.If it is incorporated into a polishing device, the truing dressing of the rotary grindstone can be performed while polishing the workpiece. In addition to being able to maximize the operating rate of the polishing equipment, it also has the advantage of eliminating the labor and time associated with attaching and detaching the rotary abrasive wheel, as well as dimensional errors during installation, which eliminates the problems of conventional methods. This is of great practical value as a truing dressing device for rotary abrasive wheels that eliminates the problem of scratches.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway side view showing an embodiment of the present invention, Fig. 2 is a partially cutaway plan view, Fig. 3 is a front view of a polishing device using the present invention, and Fig. 4 is a partially cutaway side view of the embodiment of the present invention. The cutaway side view, FIG. 5, is also a partially cutaway plane. 3... Rotating grinding wheel, 9a... Rotating grinding stone, 10
... Lifting device, 13... Motor, 15... Lifting bracket, 16... Spherical catch, 17... Grindstone holder,
18... Upper flange, 19... Spherical seat, 20
...Lower flange, 21...adjustment bolt.

Claims (1)

[Scope of utility model registration request] A rotary truing dressing device that performs truing dressing by bringing the lower surface of a rotary grindstone 9a for truing dressing into contact with a rotary abrasive wheel 3 whose upper surface is a polishing surface,
The rotating grindstone 9a has an upper flange 18 whose lower surface is a spherical seat 19, and a plurality of adjustment bolts 21 on the lower end surface.
is pivotally supported by a grinding wheel holder 17 having a lower flange 20 screwed upward, and the grinding wheel holder 17 is an elevating bracket that is slightly raised and lowered by a feed screw type elevating device 10 driven by a motor 13. 15
The spherical seat 16 formed at the upper end of the lifting bracket 15 is loosely fitted into the lifting bracket 15 to support it with the spherical seat part 19, and the lower end surface of the lifting bracket 15 is brought into contact with the upper end surface of the adjusting bolt 21 to rotate. A truing dressing device for a rotary abrasive grindstone, characterized in that a grindstone 9a is adjustable in levelness.