JPH04101773A - Forming device for grinding wheel of forming grinder - Google Patents

Abstract

PURPOSE:To form a grindstone in an optional shape, by making a grindstone forming tool holder revolvable around the axial line of a work support part corresponding to the movement in the biaxial direction of a grinding wheel so that a grindstone forming tool is brought into contact with a forming face from the slope line direction of the forming face of the grinding wheel and so as to contact with the forming face from the biaxial direction of the grindsting wheel. CONSTITUTION:A diamond wheel 8 is brought into contact with the lower end of a grinding wheel 6 on the vertical center line of the grinding wheel 6, i.e., on Z axis, and the outer peripheral tip of the grinding wheel 6 is formed by the rotations around each rotating axial line of the both 6, 8. The grinding wheel 6 is then moved simultaneously with in the Y and Z axial directions of this rotation center, and also the diamond wheel 8 is rotated around an A axis in the specified angle range. The grinding wheel 6 is thus formed in a desired outer peripheral shape. In this case, the diamond wheel 8 is controlled so as to contact from the slope line direction at all times with the forming face 11 of the grinding wheel 6, so, a correct tooth profile shape forming is executed without any relation to the error in the roundness shape of the outer diameter tip part of the diamond wheel 8.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a grinding wheel forming device for a forming grinder, and in particular, a grinding wheel that is movable in the vertical direction (Z-axis direction) and the rotational axis direction (Y-axis direction). The present invention relates to a grindstone forming device for forming and modifying the outer circumferential surface of a grindstone (grindstone working surface) in various forming grinders.

(Prior art) A grinding wheel such as a gear forming grinder has a grinding wheel working surface shape that matches the tooth groove shape of the gear to be ground, and grinds each tooth groove sequentially while rotating the gear intermittently at the pitch of the tooth groove. Conventionally, such shaping of the grinding wheel or correction of the grinding wheel is performed using a dedicated profile grinding wheel correction device installed separately from the grinding machine. FIG. 6 is a front view of a conventional profile grinding wheel correction device, in which a diamond tool 19 is attached to a pivot shaft 17 of a spindle device 16 installed on the main body bed 15 via a pivot arm 18, and a diamond tool 19 is attached to the pivot shaft 17 of a spindle device 16 installed on the main body bed 15. The motor 20 causes the swing arm 18 to swing around the axis of the swing shaft 17, that is, around the A-axis within a predetermined angle range. The grinding wheel 6 has an axis of rotation perpendicular to the direction of the A-axis and is mounted on the profile grinding wheel correction device so as to be in contact with the diamond tool 19. In this case, the grinding wheel 6 can be moved simultaneously in the direction of its rotational axis (Y-axis direction) and in the up-down direction (Z-axis direction), and by this simultaneous two-axis control and the swinging of the swing arm 18, it can be moved into a circular arc, an ellipse 9 Grinding wheel shaping such as involute tooth surface formation is performed, and after shaping, the grinding wheel 6 is removed from the profile grinding wheel correction device and mounted on a grinding machine to perform forming grinding of gears, etc.

(Problems to be Solved by the Invention) In the conventional grinding wheel forming described above, the grinding wheel must be attached to a profile grinding wheel correction device separate from the grinding machine to form the grinding wheel. When the grinding wheel is attached to and replaced with the grinding machine, the position of the forming surface of the grinding wheel may become misaligned, which poses a problem in that it takes time and effort to achieve accuracy. Even when the grinding wheel is corrected in the middle of the grinding process, the grinding wheel must be loaded into the profile grinding wheel correction device each time, which reduces processing efficiency. Since a dedicated grinding wheel correction device had to be installed separately from the grinding machine, there was also a problem in terms of space.

Therefore, the present invention has developed a grindstone forming device that does not require a separate type profile grinding wheel correction device, can perform accurate grindstone forming and correction by simply attaching a simple dedicated holder to a forming grinder, and can improve work efficiency. It is about providing.

(Means for Solving the Problems) According to the present invention, a grindstone forming tool holder attached to a work support part of a grinding machine having a two-axis controllable grinding wheel, and a grinding wheel forming tool holder attached to a work supporting part of a grinding machine having a two-axis controllable grinding wheel; a grindstone forming tool provided in the grindstone forming tool holder, and supports movement of the grindstone in two axial directions so that the grindstone forming tool contacts the grindstone forming surface from the normal direction of the grindstone forming surface. The grindstone forming tool holder is configured to rotate around the axis of the workpiece support.

(Example) Next, embodiments of the present invention will be described with reference to the drawings.

Prior to explaining the present invention, a gear forming grinder and its grinding operation will be briefly explained with reference to FIGS. 4 and 5.

A headstock 2 and a spindle 3 are placed at a predetermined center 2a on a table 1 that reciprocates in the left-right direction of the grinding machine, that is, in the
, 3a apart, and their centers 2a, 3a are spaced apart from each other.
A mandrel 4 serving as a processing jig is supported between a.

A gear 5, which is a workpiece, is fitted onto a mandrel 4, and a tooth groove 5 is driven by a drive motor (not shown) provided on the headstock 2 side.
Around its axis with the mandrel 4 at a pitch of a,
That is, it is intermittently rotated around the A axis. Above the gear 5 is a rotation center axis (7) perpendicular to and horizontal to the X-axis direction.
A grinding wheel 6 having a wheel) is arranged. The grinding wheel 6 is Y
It is movable in the axial direction and also vertically movable in the vertical center line (Z-axis) direction of the grinding wheel 6. As shown in FIGS. 2 and 5, the outer periphery of the grinding wheel 6 is pre-shaped to match the tooth groove 5a of the gear 5, and when the grinding wheel 6 is inserted into the tooth groove 5a, One tooth groove 5a is ground by the rotation of the grinding wheel 6 around the Y axis and the movement in the OX axis direction of the table holding the gear 5 via the headstock 2 and the center head 3, and the grinding wheel 6 is rotated around the tooth groove 5a. After the gear 5 is removed, the gear 5 is indexed and rotated by one pitch, and the next tooth space is ground.

FIG. 1 is a front view of the above-mentioned gear forming grinder in which a grindstone forming device according to the present invention is attached.

This embodiment is an example of a rotary dresser using a diamond wheel 8 as a forming tool for the grinding wheel. Like the mandrel 4 described above, the grindstone forming tool holder 7 is supported between the centers 2a and 3a of the headstock 2 and the center stand 3 of the gear grinding machine by means of center holes at both ends. The upper part of the center in the longitudinal direction of the holder 7 is recessed so as not to interfere with the grinding wheel 6 loaded in the grinding machine, and the diamond wheel 8 is placed in contact with the grinding wheel 6 below the grinding wheel 6. It is pivotally supported by the holder 7. The diamond wheel 8 is rotationally driven by a rotary motor 9 provided on the holder 7 via a pulley and a belt. The holder 7 is continuously rotated reciprocally around the A-axis within a predetermined angular range by a drive motor (not shown) mounted on the headstock 2 by a pivoting protrusion 10 on the headstock 2 . In this embodiment, the outer periphery of the diamond wheel 8 is in contact with the A-axis of the headstock 2 for ease of control and explanation of the operation, but of course the outer periphery of the diamond wheel 8 is in contact with the axis of the A-axis. does not have to match.

2A to 2C are side views showing the relationship between the diamond wheel 8 and the grinding wheel 6 during grinding wheel forming in the embodiment shown in FIG. 1. FIG. 2(a) shows a case where the diamond wheel 8 is in a vertical plane that includes the A axis, and in this state, the diamond wheel 8 is located at the lower end of the grinding wheel 6 on the vertical center line of the grinding wheel 6, that is, on the Z axis. The outer circumferential tip of the grinding wheel 6 is shaped by the rotation of the grinding wheel 6 and the diamond wheel 8 about their respective rotation axes.

While the diamond wheel 8 and the grinding wheel 6 are in contact with each other, the grinding wheel 6 simultaneously moves in the Y-axis and Z-axis directions of its rotation center, and at the same time, the diamond wheel 8 rotates around the A-axis within a predetermined angular range. (Figure 2 [present])
, see (C)). The two axes (Y axis,
By controlling the Z-axis) and controlling the rotation angle of the diamond wheel 8 about the A-axis, the grinding wheel 6 is formed into a desired outer peripheral shape. In this case, the diamond wheel 8 is the grinding wheel 6
The diamond wheel 8 is controlled so that it is always in contact with the forming surface 11 from the normal direction, and thereby an accurate tooth profile can be formed regardless of the error in the roundness of the outer diameter tip of the diamond wheel 8.

FIG. 3 is a front view showing another embodiment of the present invention. In this embodiment, a weighted diamond tool 12 is attached to the center of the forming tool holder 7 instead of the diamond wheel 8 described above as the grindstone forming tool. The tip of the weighted diamond tool 12 is in contact with the outer periphery of the grinding wheel, and the rotation angle of the holder 7 around the A axis is controlled and the Z of the grinding wheel is controlled.
Similar to the embodiment shown in FIG. 1, profile forming of the grinding wheel is performed by two-axis control in the axial and Y-axis directions.

In both the embodiments shown in the drawings and FIG. 3, the forming tool holder 7 may be supported on a cantilever instead of being supported on both centers, and in this case, it can be applied to a grinding machine without a tailstock.

After forming the grinding wheel 6, the forming tool holder 7 is removed from the grinding machine, a workpiece such as a gear is mounted between the headstock 2 and the tailstock 3, and the grinding wheel is used to form and grind the workpiece. Perform processing. As an application example of the present invention, a CBN grindstone or an ordinary grindstone is attached to the holder 7 instead of the diamond wheel 8 or the heavy diamond tool 12 described above, and a workpiece is attached to the grindstone shaft of the grinding machine, and the holder is rotated. If the workpiece is machined by controlling the angle and controlling the Y and Z two axes of the grindstone axis, it becomes possible to machine circular parts with complex cross-sectional shapes. An example of this is the grinding of the body of an electrocoated grindstone.

(Effects of the Invention) As explained above, according to the present invention, the grinding wheel axis can be controlled along the A-axis by using the main axis of the workpiece of a grinding machine, that is, the A-axis, which can be controlled in two axes, Y-axis and Z-axis. Since the grindstone is formed by holding the grindstone forming tool, it is possible to form the grindstone into any shape such as a circular arc or an elliptical 5-involute curved surface.Moreover, the structure is extremely simple as it is only necessary to attach the forming tool holder to the grinding machine. It is also inexpensive and can be easily applied to existing grinding machines. The forming tool holder can be supported at both the centers of the headstock and tailstock, allowing for greater rigidity. Furthermore, since the grindstone forming tool contacts the grindstone forming surface from the normal direction, highly accurate grindstone forming is possible. Furthermore, compared to conventional methods where the grinding wheel is formed on a dedicated profile grinding wheel correction device and then replaced with a grinding machine, there is no need to remove and install the grinding wheel after forming, which greatly reduces production. Improves sex.

Since there is no need to change the attachment of the grinding wheel, there are many advantages such as no accuracy errors.

[Brief explanation of the drawing]

FIG. 1 is a front view of a grindstone forming apparatus according to one embodiment of the present invention, and FIGS. 2(a) to (C) are relationships between the grindstone and the diamond wheel during the grindstone forming operation in the embodiment shown in FIG. FIG. 3 is a front view of another embodiment of the present invention, FIG. 4 is a front view of the gear forming grinder during grinding operation, and FIG. 5 is a partial side view of FIG. 6 is a schematic front view of a conventional profile grindstone correction device. 2... Headstock, 3... Tailstock, 2a, 3a... Center, 4-way mandrel, 5... Gear, 6... Grinding wheel, 7... Grinding wheel forming tool holder, 8 ...Diamond wheel, 9...Rotating motor,
11... Forming surface (of the grinding wheel), 12... Weighted diamond tool. Sub-Agent Patent Attorney Toshi Somekawa Book Box 1 Figure 3 Figure 4 1 Chi7'Jshi

Claims (1)

[Claims] A grindstone forming tool holder attached to a work support part of a grinding machine having a two-axis controllable grinding wheel, and a grindstone forming tool provided on the grindstone forming tool holder so as to be in contact with a forming surface of the grinding wheel. The grindstone forming tool holder is moved along the axis of the work support in response to the movement of the grinding wheel in two axes so that the grindstone forming tool contacts the forming surface from the normal direction of the forming surface of the grinding wheel. A grinding wheel forming device for a forming grinder characterized by being able to rotate around.