JPH01164515A - Gear grinding machine - Google Patents

Abstract

PURPOSE:To form a gear by grinding without turning a grinding wheel head by fixing a pencil-shaped grinding wheel having a grinding face formed to come into linear contact with the tooth face of a gear to be ground on its tip to the grinding wheel head with its axial center line perpendicularly intersecting the axial center line of a gear material. CONSTITUTION:A peripheral surface of the tip of a pencil-shaped grinding wheel 10 is formed with a grinding face 11 having an involute shape coming into linear contact with the opposite tooth faces of adjacent teeth of a gear to be ground. The pencil-shaped grinding wheel 10 is fixed to a grinding wheel head 4, and a column 3 is slided back and forth to position the axial center line of the grinding wheel to to perpendicularly intersect the axial center line of a gear material 8. The grinding wheel head 4 is lowered with the grinding wheel 10 rotated at high speed round its axial center, and the grinding face 11 of the grinding wheel is therefore bought into contact with the peripheral surface of the gear material 8 to being a gear grinding work. On the other hand, a table 2 is slided with the gear material rotated round its axial center. Thus the opposite tooth faces of adjacent teeth of a helical gear having a helical tooth trace are ground.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a gear grinding machine for grinding gears.

BACKGROUND OF THE INVENTION Conventional gear grinding machines generally employ a method in which the grinding surface of the outer periphery of the grindstone is formed into an involute shape according to the specifications of the gear to be ground. Therefore, when grinding a helical gear, the grindstone head that holds the grindstone is turned in accordance with the helix angle of the helical gear to be ground.

Next, if the grinding performance of the whetstone deteriorates due to chips adhering to the grinding surface of the whetstone during the grinding operation, it is necessary to perform a forming operation to sharpen the whetstone using a whetstone forming device. Regarding the grindstone forming work during the grinding work of helical gears, the grindstone forming device installed on the table of the gear grinder is rotated by the helix angle of the helical gear being ground to perform the forming work. ,or,
If it is not possible to rotate the grindstone forming device, the grindstone head is returned to a state without a helical angle to perform the forming operation, and after forming, the grindstone head is again turned in accordance with the helical gear's helical angle.

Furthermore, each time the grindstone is shaped, the diameter of the grindstone decreases. In grinding helical gears, it is necessary to change the involute shape on the grinding surface of the outer periphery of the grindstone in accordance with the change in the diameter of the grindstone. but.

Changing the involute shape of the grinding surface is a very time-consuming task, and when the error between the specifications of the helical gear being ground and the involute shape of the grinding surface exceeds the limit, the operation of the grinding wheel head or The shape of the gear being ground is controlled by changing the program that controls table feed, etc.

Problems to be Solved by the Invention First, when grinding a helical gear, the grinding wheel head must be rotated according to the helix angle of the helical gear to be ground. The forming device and grindstone head must be rotated according to the helix angle of the helical gear being ground, which is time-consuming.

In addition, the smaller the grindstone, the more frequently it is necessary to shape the grindstone, making it virtually impossible to grind stepped helical gears using a small grindstone.6 Therefore, CBN A non-formed gear grinding wheel with electrodeposited abrasive grains has been developed, but it is difficult to obtain precise tooth profile accuracy because the grindstone cannot be formed using a diamond dresser.

Means for Solving the Problem A table having a holding part for holding gear material rotatably around its axis is provided on the main body frame so as to be slidable in the horizontal direction, and furthermore, a table having a holding part that holds the gear material rotatably around the axis is provided on the main body frame so as to be slidable in the vertical direction. A freely movable grinding wheel head is provided. A pencil-shaped grindstone, which has a grinding surface shaped to make line contact with the tooth surface of the gear to be ground, is attached to the grindstone head so as to be rotatable about an axis perpendicular to the axis of the gear material.

The axis of the working gear material and the axis of the pencil-shaped grindstone are arranged perpendicularly, and the pencil-shaped grindstone is rotated around the axis to cause the grinding surface to interfere with the gear material, and the table is slid. Grinds gears. Furthermore, by sliding the table and rotating the gear material around its axis, a helical gear with an arbitrary helix angle can be ground.

Example An embodiment of the present invention will be described based on the drawings.

First, a table 2 is mounted on the main body frame 1 so as to be slidable in the left-right direction, and a column 3 is mounted so as to be slidable in the front-back direction. Further, a grindstone head 4 is attached to the column 3 so as to be slidable in the vertical direction. On the table 2, there is an NC indexing table 5 which is a holding part and this NC.
A tailstock 6, which is a holding part facing the indexing base 5, is installed, and between the NC indexing base 5 and the tailstock 6, a gear material 8 attached to a holding rod 7 is rotated around the axis. It is held rotatably. Furthermore, a cup-shaped diamond rotary dresser 9 is mounted on the table 2 so as to be rotatable about an axis in the vertical direction.

Next, a pencil-shaped grindstone 10 is provided which is detachably attached to the grindstone head 4 and rotatable around an axis in the vertical direction. An involute-shaped grinding surface 11 is formed in line contact with the opposing tooth surfaces of the matching teeth.

In such a configuration, first, the holding rod 7 with the gear material 8 attached thereto is held between the NC indexing table 5 and the tailstock 6, the pencil-shaped grindstone 10 is attached to the grindstone head 4, and the column 3 is rotated in the front-rear direction. By sliding the gear member 8, the axial center of the gear material 8 and the axial center of the pencil-shaped grindstone 10 are positioned to be perpendicular to each other.

Next, the pencil-shaped grindstone 10 is rotated around the axis at high speed, and the grindstone head 4 is lowered to cause the grinding surface 11 of the pencil-shaped grindstone 10 to interfere with the outer peripheral surface of the gear material 8, thereby starting the gear grinding operation. . - On the other hand, the gear member 9 is rotated around the axis and the table 2 is slid. As a result, opposing tooth surfaces of adjacent teeth in the helical helical gear having a helical tooth trace are ground. By repeating the above operations, the grinding operation of the helical gear is completed. Here, when the helical gears have different helix angles, it is only necessary to adjust the rotation speed of the gear material 9, and there is no need to rotate the grinding wheel head 4 according to the helix angle, and the gear material 8
It is only necessary to keep the axis of the pencil-shaped grindstone 1o perpendicular to the axis of the pencil-shaped grindstone 1o. Therefore, it is easy to grind stepped helical gears with little clearance.

Next, if the grinding performance is degraded due to welding of chips to the grinding surface 11 of the pencil-shaped grindstone 10, the pencil-shaped grindstone 10 is molded to restore the grinding performance.

The forming operation of this pencil-shaped grindstone 10 is carried out by sliding the table 2 to bring the cup-shaped diamond rotary dresser 9 close to the pencil-shaped grindstone 10, and then grinding the outer peripheral surface of the cup-shaped diamond rotary dresser 9 and the grinding surface of the pencil-shaped grindstone 1o. 11 while rotating at high speed. As a result, the surface portion of the grinding surface 11 where the grinding performance has deteriorated breaks and falls off, and a new grinding surface 11 appears. Here, when the pencil-shaped whetstone 10 is formed, the pencil-shaped whetstone 10
Its length gradually decreases, but its diameter remains constant. Therefore, when restarting the grinding operation after forming, it is only necessary to adjust the downward movement amount of the grindstone head 4, and the adjustment operation becomes extremely simple. Also.

In the forming work of the pencil-shaped grindstone 10, the table 2
It is only necessary to slide the grindstone head 4 and the grindstone head 4, and the molding work can be easily performed.

In addition, in this embodiment, the case where a helical gear was ground was explained, but the pencil-shaped grindstone 1 was used during grinding.
The spur gear can be ground by rotating the gear 8 around its axis and sliding the table 2 without rotating the gear material 8.

Effects of the Invention As described above, the present invention provides a pencil-shaped grindstone having a grinding surface shaped to make line contact with the tooth surface of the gear to be ground at its tip, and the pencil-shaped grindstone is rotatable around an axis and attached to the gear. By attaching the grindstone to the grindstone head with the axis perpendicular to the axis of the material, the pencil-shaped grindstone can be rotated around the axis and interfere with the outer peripheral surface of the gear material, and the table has a holding part that holds the gear material. Spur gears can be ground by sliding the table, and helical gears can be ground by rotating the gear material around the axis at the same time as the table slides. Gears and helical gears can be easily formed without rotating the grinding wheel head, and the gear can be ground while maintaining the axis of the pencil-shaped grinding wheel and the axis of the gear material perpendicular to each other. This makes it easy to grind stepped gears with little clearance.Furthermore, the diameter of the pencil-shaped grinding wheel remains constant even after it is formed, so no special adjustments are required. It is possible to continue grinding the gear without having to perform the grinding process, and it is possible to obtain high-precision gears by eliminating the errors caused by the forming of the pencil-shaped grindstone, as well as to improve work efficiency by reducing the time required for adjustment. It has the effect of being able to.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; FIG. 1 is a front view showing the entire gear grinding machine, FIG. 2 is a side view showing the grinding state, and FIG. 3 is a plan view showing the grinding state. It is. DESCRIPTION OF SYMBOLS 1... Main body frame, 2... Table, 4... Grindstone head, 5, 6... Holding part, 8... Gear material, 10
... Pencil-shaped grindstone, 1] - ... Grinding surface

Claims (1)

[Claims] A table having a holding portion for rotatably holding a gear material around its axis is provided on the main body frame so as to be slidable in the horizontal direction, and a grinding wheel head is provided on the main body frame so as to be slidable in the vertical direction. A pencil-shaped grindstone having a grinding surface shaped to make line contact with the tooth surface of the gear to be ground is attached to the grindstone head so as to be rotatable about an axis perpendicular to the axis of the gear material. Gear grinding machine.