JPS5940995Y2 - Dresser in grinding machine - Google Patents

Description

[Detailed description of the invention] This invention relates to a dresser that is attached to a grinder.

First, we will introduce an example of the conventional grinding machine that this invention targets.
The explanation will be given from the drawings to Fig. 3.

A swing table 3 is pivotally supported on a swing shaft 2 horizontally suspended on a base board 1 so as to be able to swing in a see-saw manner.

This rocking table 3 is always energized in the counterclockwise direction in FIG. 1 by a hanging bell 5 connected to the rotation 3 via a chain 4.

The chain 4 is hung on a splot 6 mounted on a movable shaft on the base board 1 via a bracket (not shown).

Before operation, the rocking table 3 is stationary with the front lower surface of the rocking table 3 in contact with a stopper pin I installed on the base board 1.

A grindstone head 8 is mounted on the top surface of the rocking table 3 in the front and back direction (left and right direction in the figure).
It is placed so that it can be moved to.

This grindstone head 8 is moved forward via a screw rod 11 by the operation of a cylinder 10 of a cutting device 9.

A whetstone 13 is provided at the front end of the whetstone head 8 and is actively rotated by a motor 12 on the whetstone head 8 .

The axial center C2 of the button and grindstone 13 is located on a straight line L2 passing through the axial center C1 of the swing shaft 2 and parallel to the upper surface of the swing table 3, as shown in FIG.

A headstock 15 is placed on the front end of the base board 1 on the front end 14.
A tailstock 16 is installed.

A dresser 17 is installed between the circular tables 15 and 16 so as to be movable in the front and rear directions via a dresser table 18.

This dresser 17 is actively rotated by a motor 19 attached to the tailstock 16 via a rotating shaft 40 that is not supported on the dresser stand 18 .

The axial center C3 of the dresser 17 is located on a horizontal straight line Ll passing through the axial center C1 of the swing shaft 2, as shown in FIG.

A workpiece 22 is held and touched above the dresser 17 between the centers 20 and 21 of the headstock 15 and tailstock 16, and the workpiece 22 is actively rotated by a motor 23 attached to the headstock 15.

As shown in FIG. 3, the axial center C4 of the workpiece 22 extends from the axial center C1 of the swing shaft 2 to the dresser 17 closest to the swing shaft 2.
and the distance from the axis C1 of the swing shaft 2 to the outer circumference end P of the workpiece 22 closest to the swing shaft 2 after grinding.
It is provided at a position where the distance at 24 is approximately equal.

In FIG. 3, reference numeral 24 indicates the outer periphery of the workpiece 22 before grinding.

A cam follower 25 rotatably provided at the rear of the rocking table 3 is guided by abutting against a cam surface 28 of a plate-shaped cam 21 rotatably supported by a shaft 26 on the base plate 1 below. It is now possible to do so.

This cam 27 is actively rotated for 3 hours by a motor 29 on the base board 1.

A tension cylinder 30 is installed between the lower part of the base board 1 and the rear part of the rocking table 3.The tension cylinder 30 is turned on at the start of the operation to apply a predetermined tensile load to the rocking table 3. is applied to the cam follower 25 on the cam surface 28 of the cam 27.
and the cam follower 25 is brought into contact with the rotation of the cam 27.
It rolls and expands and contracts in a stinging manner.

Therefore, due to the rotation of the cam 2γ, the cam follower 25
By being guided, the rocking table 3 is rocked about the rocking shaft 2.

When the above-mentioned grinding machine is started, the tension cylinder 30 is shortened, the rocking table 3 is rotated (normally rotated) in the clockwise direction in FIG. cam follower 2 due to the rotation of cam follower 25.
5 is guided, the rocking table 3 rotates normally around the rocking shaft 2, and the grindstone 13 is dressed by the dresser 17 and then grinds the workpiece 22.

Thereafter, the rocking table 3 rotates (reverses) in the counterclockwise direction in FIG. 1 about the rocking shaft 2 and returns to its original state.

In the above-mentioned grinding machine, the dresser 17 has conventionally been constructed by attaching a base material with a dresser material on the outer periphery to a rotating shaft. On the other hand, as shown in FIG. 5, the temperature of the dresser 11 increases considerably due to the dressing of the grindstone 13 compared to before the dressing starts, so that the base material button and the rotating shaft expand accordingly. As a result, the outer diameter of the dresser 11 gradually increases as shown by the imaginary line in FIG. 6, resulting in a decrease in the machining accuracy of the grinder.

That is, when the outer diameter of the dresser 17 increases, the grinding wheel 1
3 is dressed more than a predetermined amount, the grinding amount of the grindstone 13 to the work 22 is insufficient, the work 22 is not ground to the predetermined outer diameter, and the dresser 1
When the temperature of the dresser 11 gradually rose and the outer diameter of the dresser 11 differed each time the workpiece 220 was processed, variations occurred in the products.

Therefore, the purpose of this invention is to prevent changes in the outer diameter of the dresser heated by dressing the grindstone.
It is an object of the present invention to provide a dresser that can improve the machining accuracy of a grinder.

In order to achieve the above object, this invention uses a rotating shaft and a base material made of a material with a small coefficient of linear expansion, such as invar (also called invar or unchangeable steel).

) or Super Invar.

An embodiment of this invention will be described below with reference to FIG.

In the dresser 17, a cylindrical base material 42 with a dresser material 41 provided on the outer periphery via a set shoe 43 is attached to a rotating shaft 40 rotatably supported by a dresser table 18 via a mounting plate 44 and bolts 45. It is worn and polished.

However. The rotating shaft 40 and the base material 42 are made of invar, which is a material with a small coefficient of linear expansion.

According to the above-described dresser 17, since the rotating shaft 40 and the base material 42 are difficult to thermally expand, the outer diameter of the dressing 17 hardly changes due to the heating caused by dressing the grindstone (see the solid line in FIG. 6).

In other words, since this device is a dresser in which the rotating shaft and the base material are made of a material with a small linear expansion coefficient, it is possible to prevent changes in the outer diameter of the dresser that are heated by dressing the grindstone, and the The machining accuracy of the board is improved.

[Brief explanation of drawings]

Figure 1 is a right side view showing an example of a grinding machine targeted by this invention, Figure 2 is a plan view of the same grinder, and Figure 3 is a diagram showing the arrangement of the grinding wheel, dresser, and workpiece of the same grinder. 4 is a cross-sectional view of a dresser showing an embodiment of this invention, FIG. 5 is a diagram showing the relationship between the number of workpieces processed and the surface temperature of the dresser, and FIG. 6 is a diagram showing the relationship between the number of workpieces processed and the surface temperature of the dresser. FIG. 3 is a diagram showing the relationship with the diameter of the dresser. 1... Base board, 2... Swing axis, 3.
...Rocking table, 8... Grinding wheel stand, 13...
...Whetstone, 17...Dresser, 22...
...Workpiece, 40... Rotating axis, 41...
・Dressa material, 42...Base material.

Claims (1)

[Scope of utility model registration request] A rocking table is added to the base board via a rocking shaft so that it can swing.
A grinding wheel head is installed on a rocking table so as to be movable in the front and back direction of the rocking table, a grinding wheel is attached to the front part of the grinding wheel head so as to be able to actively rotate, and a dresser and a workpiece are installed in the front part of the base plate. In the grinding machine, the dresser is rotatably disposed on the support plate, and the dresser is rotatably disposed on the support plate. 1. A dresser comprising a base material provided with a dresser material on the outer periphery of a twisted rotating shaft, and the rotating shaft and the base material are made of a material with a small coefficient of linear expansion.