JPH0661699B2 - Grinding tool holder - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a tool holder for a grinding tool mainly used for grinding a spherical surface or a flat surface of a work.

[Conventional technology]

Conventionally, when a work is ground with a grinding tool, a work which has been previously machined into a required shape by a lathe or the like is attached to the grinding machine and ground.

[Problems to be solved by the invention]

Conventionally, a turning machine and a grinder were required to grind a workpiece. For this reason, there is a problem that grinding cannot be performed in a factory without a grinder.

Therefore, it is an object of the present invention to provide a grinding tool holder capable of grinding only by a turning machine, for example, a lathe.

[Means for solving problems]

The configuration of the present invention for achieving this object will be described with reference to FIG. 1 corresponding to the embodiment. In the cylindrical portions 3 and 4 projecting from the handle portion 2 attached to the tool base 12 of the turning machine, A tool mounting shaft 9 is provided rotatably parallel to the work drive axis 17 of the turning machine in the surface grinding and at a predetermined crossing angle in the spherical grinding, and a self-aligning bearing 10 is provided on the tool mounting shaft 9. The grinding tool 13 is mounted through the tool mounting shaft 9. The tool mounting shaft 9 is driven to rotate by the difference in the peripheral speed of the work 14 when the work 14 and the grinding tool 13 are in contact with each other.

[Work]

In order to grind the work 14 by the turning machine, first, the work 14 attached to the spindle of the turning machine is driven, and the end surface 15 of the work is turned by the cutting tool attached to the tool base 12. Next, the grinding tool holder 1 is attached to the tool base 12 in place of the cutting tool, the work 14 is driven, and the grinding tool 13 is pressed against the end surface 15, and the grinding tool 13 moves around the circumference of the work 14 as shown in FIG. Workpiece 14 rotates due to the difference in speed.
The end surface 15 of is ground. That is, it is possible to grind a workpiece with a grinding tool by a turning machine without a grinding tool driving device.

Since the grinding tool 13 can be slightly swung with respect to the tool mounting shaft 9 by the self-aligning bearing 10, even if the grinding tool 13 initially contacts the machining end surface of the work piece 14, it does not contact the machining end surface. For example, in the case of spherical grinding, even if the grinding tool holder 1 is set on the tool base 12 with the intersection of the axis 21 of the tool mounting shaft 9 and the workpiece drive axis 17 slightly displaced from the spherical center of the machining spherical surface 15, the machining spherical surface 15 When the grinding tool 13 is pressed against, the grinding tool axis 16 automatically passes through the spherical center of the machining spherical surface 15, and the grinding tool 13 does not hit the machining spherical surface 15. For the same reason, the spherical surfaces of a plurality of workpieces having slightly different spherical diameters can be ground without changing the intersection angle between the workpiece drive axis 17 and the axis 21 of the tool mounting shaft 9.

〔Example〕

An embodiment of the present invention will be described with reference to the drawings. In FIG. 1, reference numeral 1 is a grinding tool holder, and a stepped cylindrical body portion 3 projecting from one end of the handle portion 2 and inclined at a predetermined angle with respect to the handle portion 2 has a large-diameter cylinder on the tip side thereof. The intermediate shaft 4 is inserted into the shaft portion so as to be movable back and forth, and a spring 5 provided in the small diameter cylindrical portion of the stepped cylindrical body portion 3 embedded in the handle portion 2 causes the front end surface of the intermediate shaft 4 to engage with the tip of the large diameter cylindrical portion. A tool mounting shaft 9 that abuts against the stopper 6 and is rotatably mounted by a needle bearing 7 in the hole of the intermediate shaft 4, and thrust bearings 8, 8 arranged at both ends of the needle bearing 7.
Are attached to both ends of the hole of the intermediate shaft 4, and the tool mounting portion 11 having the cup grindstone 13 mounted thereto is mounted to the tip of the tool mounting shaft 9 via the self-aligning bearing 10.

When the grinding tool holder 1 is set on the tool base 12 of the lathe, the axis 21 of the tool mounting shaft 9 and the work drive axis 1 of the lathe 1
Even if the intersection point with 7 is set slightly off the center of the turning spherical surface 15 of the workpiece end surface, the spherical surface can be appropriately ground.

In this case, when the cup grindstone 13 comes into contact with the cut spherical surface 15 of the work 14, it comes into partial contact, but when it is further pressed, the spring 5 is compressed and the self-aligning bearing 10 rotates and no partial contact occurs. This is because the cup grindstone axis 16 passes through the spherical center of the processed spherical surface 15. Further, when the grindstone 13 that is one-sided against the processed spherical surface 15 is pressed against the processed spherical surface 15, the self-aligning bearing 10 rotates and the cup grindstone axis 1
6 and the work drive axis 17 change the crossing angle, the cup grindstone 13 having the crossing angle of θ _{2 in} FIG.
After grinding the machined spherical surface 15 by, the cup grindstone 13 is pressed against the machined spherical surface 15 'having a slightly different spherical diameter to grind the machined spherical surface 15' at the crossing angle θ ₁ .

The cup grindstone 13 is a turning spherical surface 1 of the rotating work 14.
As shown in FIG. 2, the work 1 is pressed against the work 1.
It rotates with a difference in peripheral speed of 4 and the machining accuracy of the turning spherical surface 15 is improved by the creation processing by the rotation of the cup grindstone 13. Further, after grinding, a buff having a similar shape may be attached to the tool mounting portion 11 instead of the cup grindstone, and buffing after grinding may be performed.

Although the above description was mainly concerned with the spherical grinding of the work, in the grinding of the flat end surface of the work that has been turned, the axis 21 of the tool mounting shaft 9 is rotated in parallel or substantially parallel to the work drive axis 17. When the cup grindstone is pressed against the flat end surface of the work, the cup grindstone rotates due to the difference in the peripheral speed of the work 14 to grind the flat end surface of the work.

〔The invention's effect〕

As is clear from the above description, the grinding tool holder according to the present invention is attached to a turning machine, for example, a tool stand of a lathe to grind a turned end face of a work, so that grinding of a work can be performed only by a lathe. Therefore, it is a good news for a factory that does not have a grinding machine, and the lathes you have can greatly improve the machining accuracy of workpieces.
Further, the deviation of the grinding tool axis with respect to the work drive axis is automatically corrected by pressing the grinding tool against the machining end surface, so that the grinding tool holder can be easily set on the tool table of the turning machine. Further, there is an advantage that it is possible to spherically grind a plurality of workpieces in which the spherical diameter of the workpiece end surface is slightly different under the condition that the tool mounting shaft of the grinding tool holder is set on the tool stand at a predetermined angle. Further, since the grinding tool rotates due to the difference in the peripheral speed of the work, a driving device for the grinding tool holder is unnecessary, and a compact and inexpensive grinding tool holder can be provided.

[Brief description of drawings]

FIG. 1 is a partially sectional side view of an embodiment of the present invention, FIG. 2 is a front view showing an example of workpiece grinding with a cup grindstone, and FIG. 3 is an explanatory view of grinding a spherical surface having a slightly different spherical diameter. . 2 ... Handle part, 3 ... Cylindrical part, 9 ... Tool mounting shaft, 10 ...
… Self-aligning bearing, 11 …… Tool mounting part, 12 …… Tool stand, 13 …… Grinding tool (cup grindstone).

Claims (1)

[Claims] 1. A cylindrical portion mounted on a tool base of a turning machine via a handle, and rotatable about the cylindrical body part in parallel or at a predetermined crossing angle with respect to a work drive axis of the turning machine. It is equipped with a tool mounting shaft that is provided and a grinding tool that is mounted on this tool mounting shaft via a self-aligning bearing.This grinding tool can be driven to rotate by the difference in peripheral speed between the work and the work when the grinding tool is in contact. Characteristic grinding tool holder.