JPH0360918A - Grinder for toothed wheel - Google Patents

Abstract

PURPOSE:To obviate the need for arranging a revolving mechanism on a grindstone head and to secure the space of the grindstone head side sufficiently by composing it so as to set the crossed axes angle of the supporting center shaft of the body to be cut and a grindstone with revolving a table around the vertical shaft. CONSTITUTION:In the case of setting a helix angle on a grindstone 37 for the body 29 to be cut, a table base 22 is revolved for a bed 21 and by revolving a table 23 the grindstone 37 is made in a relatively revolving state. The space of a grindstone head 33 is thus secured by revolving the table 22, the stiffness of the grindstone shaft is increased and the grinding can be made highly efficient and highly accurate.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a gear grinding machine, and is suitable for use in grinding gears having helical teeth.

<Prior art> In order to increase the durability and wear resistance of gears and make them suitable for high-speed rotation, the gears are hardened and then ground using a gear grinder.

The configuration of the gear grinding machine will be explained based on FIGS. 8 to 10. FIGS. 8, 9, and 10 show the front, side, and top views of the tM wheel grinder, respectively.

A table 2 is supported on a bed 1 installed on the floor so that it can slide back and forth in one horizontal direction (left and right).
is designed to be driven back and forth via a ball screw (not shown). The top surface of the table 2 is equipped with a main shaft that rotates and a two-head spindle 3 and a tail stock 4 are placed coaxially.
15 is supported.

The bed 1 on the back side of the table 2 has a column 6 extending 5 in the horizontal direction (back and forth direction) perpendicular to the moving direction of the table 2.
The column 6 is supported so as to be able to slide back and forth, and the column 6 is connected to the grinding wheel front and rear motor 7 (
9 and 10). A vertically extending sliding surface 8 is formed on the side surface of the column 6 on the table 2 side, and a slider 9 is slidably supported on the sliding surface 8, and the slider 9 is reciprocated by a grindstone vertical motor 10. . The slider 9 has a grinding wheel head 11 that can rotate around a vertical axis.
is supported, and a grindstone 12 that is driven and rotated around a horizontal axis is attached to the grindstone head 11. The grindstone 12 (grindstone shaft) is driven by a grindstone drive motor 13 (FIG. 9).

At the end of the table 2, a grindstone molding device 14 is provided so as to be rotatable around a vertical axis on the support center line of the gear 5 to be cut. A dresser 14 is provided for truing and dressing the grindstone 12.

The above-mentioned grindstone front and rear motor 7, grindstone up and down motor 10, grindstone drive motor 13, spindle WjA driving motor (not shown) and table drive motor (not shown) are separately provided.Niyotte 111'mflJt
IIJst'L75, k 5 Ni.

The grinding action of the gear grinder having the above configuration will be explained.

Work gear 5 between the centers of the headstock 3 and tailstock 4
By supporting the main shaft and driving the main shaft, the gear to be cut 5 is driven and rotated through burrs and the like. The grindstone [11] is turned in accordance with the helix angle of the gear 5 to be cut, and the grindstone 12 is driven and rotated by the drive of the grindstone drive motor 13. By the horizontal movement of the table 2, the longitudinal movement of the column 6, and the vertical movement of the slider 9, the gear to be cut 5 and the grindstone 12 are brought into contact in a predetermined state, and the gear to be cut 5 is ground. When truing and dressing the grindstone 12, the grindstone forming device 14 is rotated at the same angle as the rotation angle of the grindstone head 11, and the table 2 and the grindstone head 11 are moved in the same way as during grinding to bring the dresser into contact with the grindstone 12. let

<Problems to be Solved by the Invention> In the gear grinding machine described above, the helix angle of the grindstone 12 is set by rotating the grindstone head 11. Therefore, within the rotation range of the whetstone head 11, the column 6 and the whetstone head 1
1 must not interfere with each other, and the space for the grinding wheel head 11 is limited, so that only small grinding wheel shafts and grinding wheel drive motors 13 can be used. Therefore, since the rigidity of the grindstone shaft is low and the output of the grindstone drive motor 13 is also small, if the grinding conditions are kept low and the gear 5 to be cut becomes large, it is undeniable that machining accuracy and machining efficiency will decrease.

The present invention has been made in view of the above circumstances, and provides a gear grinding machine in which the helix angle of the grinding wheel is set by rotating a table on which a workpiece is held, thereby saving space for the grinding wheel head. The purpose is to increase the rigidity of the grinding process and improve the efficiency and precision of the grinding process.

<Means for Solving the Problems> In order to achieve the above object, the present invention has a structure in which a table base that can freely rotate around a vertical axis is supported on a bed, and the support center line of the separated object is aligned with the rotation center of the table base. The present invention is characterized in that an axial table is supported on the table base so as to be able to freely slide back and forth along the support center line of the workpiece.

Action> When setting a helix angle on the grindstone with respect to the workpiece, the table base is rotated with respect to the bed, and the table is rotated to put the whetstone in a relatively rotated state.

Embodiment> FIGS. 1, 2, and 3 respectively show the front, side, and plane of a gear grinding machine according to an embodiment of the present invention, and FIG. 4 shows its table rotation mechanism. be.

A ped 21 placed on the floor supports a saddle 22 as a table base that is rotatable around a vertical axis, and the saddle 22 is provided with a table 23 that is slidable in one horizontal direction.

As shown in FIG. 4, a worm wheel 24 that is concentric with the center of rotation of a saddle 22 is fixed to the bed 21, and a worm wheel 24 that engages with the worm wheel 24 is fixed to the saddle 22.
5 is provided, and the worm 25 is connected to a table rotation motor 26.
driven by. That is, since the worm wheel 24 is fixed to the ped 21, the worm 25 is moved by the drive of the table rotation motor 26, and the saddle 22 is rotated.

On the top surface of the table 23, a headstock 27 and a tailstock 28 are coaxially provided with a main shaft for driving and rotating.
f, and a gear to be cut 29 as an object to be separated is supported by the headstock 27 and the tailstock 28. The center line of the headstock 27 and the tailstock 28, that is, the support center line of the gear to be cut 29 coincides with the rotation center line of the saddle 22, and the table 23 moves on the saddle 22 along the center line of support of the gear to be cut 29. It is slidable. The table 23 is driven back and forth by a table drive motor 30.

A column 3 is supported on the bed 21 on the rear side of the table 23 so as to be slidable in the horizontal direction (back and forth direction) intersecting the direction of movement of the table 23, and the column 31 is reciprocated by a grindstone front and rear motor 32. Ru. The shape of the column 31 is such that it does not interfere with the table 23 even if the table 23 turns when the column 31 approaches the table 23 most (see FIG. 3).

Column 31 has table 2361! A grindstone head 33 protruding in the direction I is provided so as to be movable in the vertical direction, and the grindstone head 33 is reciprocated by a grindstone vertical motor 34. A grindstone shaft 35 is provided on the grindstone head 33 and is horizontal along the moving direction of the column 31, and the grindstone shaft 35 is driven and rotated by a grindstone drive motor 36. A whetstone 37 is attached to the tip of the whetstone shaft 35, and the whetstone 37 is attached to the whetstone cover 3 fixed to the whetstone head 33.
covered by 8.

A W139 manufactured by Grindstone Forming is provided on the headstock 27 so as to be able to rotate around a vertical axis, and the center of rotation of the grindstone forming device 39 coincides with the support center line of the gear to be cut 29 .

The structure of the fi 39 made by grindstone molding will be explained based on FIGS. 5 and 6. FIG. 5 shows a cross-sectional side view of the grindstone forming device 39, and FIG. 6 shows a plane view thereof.

A fixed base 40 is attached to the headstock 27, and a swing base 41 that is rotatable around a vertical axis is supported on the fixed base 40. A pair of holders 42 are fixed to the upper surface of the rotating base 41, and the holders 42 have a diamond dresser (for truing and dressing the grindstone 37).
dresser) 43 is attached. A cylinder chamber 44 is formed between the fixed base 40 and the rotating base 41,
A piston 45 is provided in the cylinder chamber 441ζ.

A clamp 46 is attached to the piston 45, and the disc spring 4
7 urges the piston 4s downward, the clamp 46 engages with the swing base 41, and the swing base 41 becomes unable to swing.

When fluid pressure is supplied to the cylinder chamber 44, the piston 45 moves upward against the spring force of the disc spring 47, and the clamp 4
6 is released from the rotation base 41, and the rotation base 4
1 can turn.

As shown in FIGS. 1 and 2, the grindstone cover 38 is provided with a fixed arm 48 as a coupling device that is rotatable around a horizontal axis, and the fixed arm 48 is made of a molded grindstone! It can be fixed to the holder 42 of 1!39.

The gear grinding machine described above includes a main shaft drive motor (not shown), a table rotation motor 26, and a table drive motor 3.
The drive of the 01 grindstone front and back motor 32 and the grindstone up and down motor 34 is controlled by a separately provided numerical control device (not shown).

The operation of the gear grinder having the above configuration will be explained based on FIG. 7. FIG. 7 shows the turning situation of the table 23.

In order to mesh the grindstone 37 along the helical tooth groove of the to-be-cut gear 29, the support center line P of the to-be-cut gear 29 and the grindstone center line Q need to be rotated by the helix angle β of the to-be-cut gear 29. In order to set the grindstone 37 to the helix angle β, the table rotation motor 26 is driven to move the worm 25 around the worm wheel 24, and the table 23 is rotated.

Prior to grinding, the grinding wheel 37 is trued and dressed. Move the table 23 and move the table 23
The center of rotation of the grindstone forming device 39 is made to coincide with the center of rotation of the grindstone forming device 39. The fixed arm 48 is rotated downward and fixed to the holder 42, and in this state, the table 23 is fixed to the helix angle βt of the gear to be cut 29! and rotate it.

The piston 45 of the grindstone forming device 39 is actuated to release the engagement of the clamp 46 with the swing base 41, thereby allowing the swing base 41 to swing relative to the fixed base 40. The worm 25 is rotated by the drive of the table rotation motor 26, and the saddle 22 is rotated by a predetermined angle (β) with respect to the bed 21. The rotation of the saddle 22 causes the table 23 to rotate by the same angle as the helix angle, and at the same time, the rotating base 41 of the grindstone forming device 39 also rotates with respect to the fixed base 40 by the same angle as the helix angle β. As a result, the dresser 43 and the grindstone 37
Holder 42 can be attached to table 2 without changing its relative relationship with table 2.
This means that it turned at the same angle as No. 3. After rotating the swing base 41, the piston 45 is moved by the spring force of the disc spring 47, the swing base 41 is fixed to the fixed base 40 side by the clamp 46, and the boulder 42 and the fixed arm 48 are released and fixed. Rotate arm 48 upwards. In this state, the grindstone up and down motor 34 is synchronously controlled to move the grindstone 37 along a required forming trajectory, and the dresser 43 performs truing and dressing of the grindstone 37.

By fixing the fixed arm 48 to the holder 42 and rotating the table 23, the dresser 43 can be rotated at a predetermined torsion angle with respect to the table 23 together with the grindstone 37.

After truing and dressing of the grindstone 37 is completed, the table 23 is moved and the gear 29 to be cut is ground. Grinding of the gear to be cut 29 in the face width direction is performed by controlling the rotation of the main shaft of the headstock 27 synchronously with the movement of the table 23 (movement of the gear to be cut 29 in the support center line direction) using the following equation (1). .

The amount of movement of the table 23 is L (wIm), the rotation angle of the main shaft is θ (deg), and the torsion angle on the pitch circle of the gear to be cut 29 is β. (deg), the pitch circle diameter of the gear to be cut 29 is do(d
In the case of eg), when the grinding of one tooth of the gear to be cut 29 is completed by synchronized control of the movement of the table 23 and the rotation of the main shaft, the grinding wheel 37 and the tooth groove are disengaged by driving the grinding wheel vertical motor 34. Next, the (1/number of teeth) rotating main shaft of the gear to be cut 29 is indexed and rotated to engage the grindstone 37 and the tooth groove, and the tooth groove of the gear to be cut 29 is similarly ground by synchronous control. By repeating the above operation a number of times corresponding to the number of teeth of the gear to be cut 29, the grinding of the gold teeth is completed.

When grinding workpiece gears 29 with different helix angles,
The saddle 22 is rotated relative to the bed 21, the table 23 is rotated at a predetermined angle, and the cut tooth of the grindstone 37 @29 is rotated.
Change the inclination angle. At this time, by connecting the grindstone head 33 side and the grindstone forming device 39 side with the fixed arm 48, the dresser 43 can be moved relative to the table 23 (workpiece gear 29) while maintaining a constant positional relationship with the grindstone 37. Turn it around.

In the gear grinding machine described above, the intersection angle between the gear to be cut 29 and the grinding wheel 37 is set by rotating the table 23 that supports the gear to be cut 29, so the turning 81wI on the grinding wheel head 33 is not required. space limitations are removed. In addition, the fixed arm 48 connects the grinding wheel @ 33 side to the grinding wheel forming bag [
By connecting the 39 side and rotating the table 23, the dresser 43 can be rotated at a predetermined angle with the grindstone 37 with respect to the table 23.
Not only does a synchronous turning mechanism become unnecessary, but also the positional relationship with respect to the grindstone 37 can be maintained accurately.

In addition, a W139 manufactured by Grindstone Molding is installed on the headstock 27, so that the movement stroke of the table 23 from the grinding position of the gear to be cut 29 to the truing and dressing positions is shortened, and the forming time of the grindstone 37 is shortened. You can improve your sexual performance.

<Effects of the Invention> By rotating the table around the vertical axis of the gear grinding machine of the present invention, the intersection angle between the support center axis of the workpiece and the grinding wheel is set. There is no need for a turning mechanism, and you can secure enough space on the grinding wheel head side.

As a result, the rigidity of the grindstone shaft can be increased, the size of the grindstone drive motor can be increased, and grinding can be performed with high efficiency and high precision.

[Brief explanation of drawings]

FIG. 1 is a front view of a gear grinding machine according to an embodiment of the present invention;
Fig. 2 is a side view thereof, Fig. 3 is a plan view thereof, Fig. 4 is a sectional view showing the table rotation mechanism, Fig. 5 is a sectional view of the grindstone forming device, and Fig. 6 is a plan view of Fig. 5. 7 is an explanatory diagram of the table rotation, FIG. 8 is a front view of a conventional mIx grinding machine, FIG. 9 is a side view thereof, and FIG. 10 is a plan view thereof. In the drawing, 21 is a verad, 22 is a saddle, 23 is a table, 27 is a headstock, 28 is a tail stock, 29 is a gear to be cut, 31 is a column, 33 is a grinding wheel head, 37 is a grinding wheel, 39 is a grinding wheel forming The device, 48, is a fixed arm. Patent applicant Mitsubishi Heavy Industries Co., Ltd. Cho'M Iron Works Agent

Claims (1)

[Claims] A table base that can freely rotate around a vertical axis is supported on a bed, and the table whose support center line of the workpiece is on the rotation center axis of the table base can be freely slid back and forth along the support center line of the workpiece. A gear grinding machine characterized in that the gear grinding machine is supported on the table base.