JP2504874Y2 - Forming tool holder for grindstone forming equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a grindstone forming device for a forming grinding machine, and in particular, a grindstone wheel is movable in a vertical direction (Z axis direction) and a rotation axis direction (Y axis direction). TECHNICAL FIELD The present invention relates to a forming tool holder attached to various forming grinders.

(Prior Art) For example, in a gear forming grinder, a grinding wheel to be used has a grindstone working surface shape that matches a tooth profile of a gear to be ground, and a tooth groove is formed while intermittently rotating the gear by a tooth pitch. Grind sequentially. As a grindstone forming device for shaping the shape of such a grinding wheel, without removing the grinding wheel from the grinder, only the workpiece is removed, and the grinding wheel forming device is attached at that position to form and correct the grinding wheel. What has been proposed is proposed. Explaining with reference to FIG. 3 and FIG.
Grinding wheel forming tool holder 2 attached to a supporting portion of a work (work) of a grinding machine having a grinding wheel 1 capable of biaxial control of an A-axis and a Y-axis, and a grinding wheel so as to come into contact with a molding surface 3 of the grinding wheel 1. A grinding stone forming tool (rotary dresser) 4 axially supported by the forming tool holder 2. In this molding apparatus, the rotary dresser 4 is so arranged that the rotary dresser 4 is always in contact with the molding surface 3 of the grinding wheel 1 in the direction normal to the molding surface.
The grindstone forming tool holder 2 can be turned by 180 ° around the rotation axis of the work supporting portion, that is, the A axis, in response to the movement in the Z and Y axis directions. In this case, the grinding tool holder 2 has a grinding wheel 1 whose upper part in the longitudinal center is mounted on the grinder.
The rotary dresser 4 is rotatably supported so as to come into contact with the grinding wheel 1 at the position of the recess and is rotated by a motor 8 provided in the holder 2 via a pulley and a belt. . Therefore, the rotary dresser 4
The rotation center of is offset from the axis of the A-axis by the radius r of the dresser.

(Problems to be Solved by the Invention) In the grindstone forming apparatus of the type described above, the center of rotation of the dresser 4 around the shaft center is held at least offset by the dresser radius from the swing center (A axis) of the dresser. Therefore, the dresser 4 is 180 ° around the A axis.
If the holder 2 is swung within the range, the whirling radius of the holder 2 increases. For this reason, the inertial force is large, the rigidity of the holder 2 itself is insufficient, and the holder supporting portion is applied with an excessive force. As a result, a molding error may occur, and an accurate and accurate profile may not be formed on the grinding wheel.

The present invention provides a forming tool holder for a grindstone forming device that has a small whirling radius, can perform a swivel motion without applying an excessive force to the holder supporting portion, and can improve the forming surface accuracy of the grinding wheel. Especially.

(Means for Solving the Problems) According to the present invention, the grindstone forming tool is attached to the workpiece support part of the grinder having a grindstone capable of biaxial control, and the grindstone forming tool is always attached to the forming surface of the grindstone. In a forming tool holder of a grindstone forming apparatus that is controlled so as to contact from a normal direction, the grindstone forming tool is pivotally attached to the workpiece support, and the center of rotation of the grindstone forming tool is the workpiece support. A forming tool holder is provided that is configured to hold in position on an axis of rotation.

(Example) Next, this invention is demonstrated about an Example with reference to FIG. 1 and FIG.

A headstock 5 and a tailstock 7 for supporting a work are placed with a predetermined center interval on a table that reciprocates in the work axis direction of the forming and grinding machine, and a forming tool holder 2 described later is pivotally supported between these centers. To be done. A grinding wheel 1 having a rotation axis (Y axis) that is perpendicular to the center axis of the headstock 5, that is, the A axis, is axially supported near the center of the molding tool holder 2 in the longitudinal direction. ing.

The grinding wheel 1 can move in and out in the Y-axis direction, and can also move up and down in the Z-direction perpendicular to the Y-axis.
When actually grinding the work, the forming tool holder 2 is removed and the work is attached at this position.

In this embodiment, the forming tool holder 2 is composed of a straight member as a whole, and its end portion is engaged with a guide 6 provided on the headstock 5 to rotate the headstock 5 to rotate around the A axis. It is designed to turn within a range of 180 °.

In the forming tool, the rotary dresser 4 constituted by a diamond wheel in this embodiment is pivotally supported on the forming tool holder 2 so that the rotary dresser 4 is located at a substantially central position and the rotation center axis is on the A axis. The rotary dresser 4
The central axis of is parallel to the Y-axis. Rotary dresser 4
Is rotated by a driving device 9 provided in the holder 2 via a pulley and a belt.

In the forming operation of the grinding wheel 1, the rotary dresser 4
Is controlled so that its outer peripheral edge is always in contact with the forming surface 3 of the grinding wheel 1 from the normal direction and turns around the A axis.
Moreover, the grinding wheel 1 is controlled to move in the Y-axis and Z-axis directions. FIG. 2 is a diagram showing the positional relationship between the rotary dresser 4 and the grinding wheel 1 at four stages during the grindstone forming operation.
While the grinding wheel 1 and the rotary dresser 4 rotate about their respective rotary shaft cores, desired grinding stones are formed by controlling the Y and Z axes of the grinding wheel 1 and turning the holder 2 around the A axis. As is clear from FIG. 2, the rotary shaft center of the rotary dresser 4 intersects the A axis, and the rotary dresser 4 by the forming tool holder 2 during swinging around the A axis.
The whirling around is extremely small, and a large inertial force does not occur even when operating at high speed, so that accurate grinding stone molding can be performed.
Since the forming tool holder 2 also has a simple shape, it is easy to manufacture, and the circumference of the dresser shaft support portion does not occupy a large space, and the structure is simple.

In the above embodiment, the forming tool holder has a structure of supporting both ends, but it is needless to say that it may be a cantilever support mounted only on the headstock side.

(Effect of the Invention) As described above, according to the present invention, the holder for holding the grindstone forming tool is attached to the grinding machine in a balanced state without whirling, so that the rigidity of the holder itself increases and the holder is prevented from swinging. Shake is reduced. Unnecessary force is also applied to the holder support, and the precision of the grinding stone surface is improved. Since the shape of the holder is simplified, it can be manufactured at low cost.

[Brief description of drawings]

FIG. 1 is a front view of a grindstone forming apparatus according to an embodiment of the present invention,
FIG. 2 is a diagram showing a positional relationship between a grinding wheel and a dresser during a grindstone forming operation in an embodiment of the present invention, FIG. 3 is a front view of a conventional grindstone forming apparatus, and FIG. 4 is shown in FIG. It is a figure showing the forming operation in the conventional example. 1 ... Grinding wheel, 2 ... Molding tool holder, 3 ... Molding surface,
4 ... Rotary dresser, (molding tool), 5 ... headstock, 6 ... turning.

Claims (1)

(57) [Scope of utility model registration request] 1. A grinder having a biaxially controllable grinding wheel, which is attached to a workpiece support portion of a grinding machine, and is controlled so that a grinding wheel forming tool always contacts a forming surface of the grinding wheel in a normal direction. In a forming tool holder of a grindstone forming apparatus, the grindstone forming tool is rotatably attached to the work piece supporting portion, and holds the grindstone forming tool so that its rotation center is located on the rotation axis of the work piece supporting portion. Molding tool holder characterized in that.