JPH01216718A - Creating device for gear grinding machine - Google Patents

Abstract

PURPOSE:To simply cope with works having different data by synchronously controlling driving servo motors of a table and a main shaft with an NC control device to perform the gear creating motion and rotatively controlling the main shaft driving servo motor alone to perform notching and indexing. CONSTITUTION:To perform the creating motion of a ground gear W against a grinding wheel G, driving servo motors 22 and 23 of a table 12 and a main shaft 13 are synchronously controlled by an NC control device 24 so that the movement of the table 12 and the rotation of the main shaft 13 maintain the relationship determined by the data of the ground gear W. On the other hand, the notching action in the grinding process can be obtained by rotating the main shaft driving servo motor 23 alone by the notch equivalent so that the tooth face of the ground gear W and the grinding face of the wheel G are neared together. At the stoke end when the engaging contact between the ground gear W and the wheel G is released, the main shaft driving servo motor 23 is rotated alone by the indexing angle for one tooth to perform indexing, and the next creating motion is started.

Description

DETAILED DESCRIPTION OF THE INVENTION <Public funds for industrial use> The present invention relates to a generating device that causes a gear to be cut to be interlocked in generating in a gear grinding machine.

<Conventional technology> An example of a gear grinding machine using the conventional generation method is shown in Fig. 2.

As shown in Fig. 2, in this gear grinding machine, the bed 11
A table 12 is attached to the top so as to be able to slide back and forth, and a main shaft 13 is mounted on the bed 11. The table 12 is connected to a motor 15 via a crank mechanism 14, and is reciprocated over the bed 11 by the drive of the motor 15. The main shaft 13 is rotatably supported around an axis perpendicular to the moving direction of the table 12, and a semicircular pitch book 16 is fixed to one end of the main shaft 13, while a cut gear W is attached to the other end. It is now possible to The circumference of the pitch block 16 is formed to have a predetermined radius determined by the specifications of the gear W to be cut.

Further, a gate-shaped stand 17 is erected on the bed 11 so as to pass above the pitch block 16. This stand 17 has two steel belts 18 spaced apart.
One end of steel belts a and 18b is fixed, and these steel belts 18m and 13b are wound around the circumference of the pitch block 16, one clockwise and the other counterclockwise, so as to cross each other. At the same time, the other ends are fixed to both ends of the pitch block 16, respectively.

Furthermore, the main shaft 13 is provided with an indexing device N having an indexing plate on the same axis.
(not shown) is attached.

On the other hand, a grinding wheel G is disposed above the gear W to be cut, and is driven to rotate by a motor (not shown).

In such a conventional gear grinding machine, when the motor 15 is activated and the table 12 is reciprocated by the crank mechanism 14, the pitch block 16 is moved against the steel belt 1.
It rotates by being pulled by 8a and 18b. As a result, as shown in Fig. 3, the gear to be cut W undergoes a reciprocating motion and rotates in synchronization with this reciprocating motion. A generating movement (basically an impoline curve movement) along the tooth surface is performed, and the tooth surface is ground.

On the other hand, when the table 12 makes one reciprocation and finishes grinding the tooth surface of one tooth of the workpiece gear W, at the end of the stroke of the table 12 where the contact between the workpiece gear W and the grindstone G is released, the index plate is The indexing device used indexes and rotates the gear W to be cut by one tooth, and then the next tooth surface is ground in the same manner.

<Problems to be Solved by the Invention> However, the conventional gear grinding machine described above has the following problems.

(1) The radius of the pitch block 16 and the number of teeth on the index plate are uniquely determined by the specifications of the gear W to be cut (the gear W to be cut
pitch circle radius or base circle radius and number of teeth). Therefore,
It is necessary to manufacture an index plate for each dedicated pitch block 16 according to the specifications of the gear W to be cut, and to manage and store it.

(2) Every time the specifications of the gear W to be cut change, it is necessary to perform setup work to replace it with a dedicated pitch block 16.

(3) With the replacement of pitch block 16, pi.

Steel bell (length matching the radius of the block) 18a
, 18b must be prepared.

(4) Since the dimensions of the index plate are constant depending on the machine, there is a limit to the number of index teeth.

(5) When grinding a helical gear such as a shaving cutter into a bias tooth profile (a tooth profile in which the tooth surface pressure angle changes sequentially in the axial direction of the gear), the center of the outer circumferential arc of the pitch block 16 is the axis of the main shaft 13. It is necessary to sequentially change the radius of the pitch block 16 according to the rotation angle of the pitch block 16 by attaching it eccentrically to the pitch block 16 or by pasting a correction piece on the outer periphery of the pitch block 16.

(6) In the cutting operation in the gear grinding process, it is necessary to shift the relative contact position (center distance II) of the grinding wheel G and the gear W to be cut, and the grinding surface of the grinding wheel, such as a modified tooth profile, is formed along with the cutting operation. A position correction operation is required.

The present invention solves these problems in conventional gear grinding machines, and provides a generating device for gear grinding machines that can easily handle various workpieces with different specifications. It is an object.

Means for Solving the Problems> A generating device according to the present invention that achieves the above-mentioned object is a gear grinding machine that performs grinding by interlocking generation of a gear to be cut with a grinding wheel. a table supported on the table; a main shaft rotatably supported on the table about an axis perpendicular to the direction of movement of the table; and a main shaft to which a gear to be cut is attached; and a servo motor for driving the table. A special feature characterized by comprising: a main shaft driving servo motor for driving the main shaft; and an NC@ control device capable of synchronously controlling both the servo motors.
For use> By synchronously controlling the table drive servo motor and the spindle drive servo motor using the NC control device, the cut gear attached to the spindle performs tooth surface generation interlock. Furthermore, cutting and indexing are performed by independently controlling the rotation of the main shaft drive servo motor. .

Example of implementation An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram of an embodiment of the present invention.

In this device, as shown in FIG. 1, a table 12 is mounted on a ped 11 so as to be able to slide back and forth, as in the conventional case, and the table 12 is also rotatable around an axis that is perpendicular to the direction of movement of the table 12. A main shaft 13 is supported on the main shaft 13.
A gear W to be cut is attached to one end of the machine.

The table 12 is connected to a table driving servo motor 22 via a ball screw 21, and the table 12 is reciprocated over the bed 11 by the drive of this servo motor 22.

Further, a direct drive servo motor 23 for driving the main shaft is directly connected to the end of the main shaft 13.
The main shaft 13 is rotationally driven.

Both the table drive servo motor 22 and the spindle drive servo motor 23 are N C! It is connected to II Goso@24 and can control two axes at the same time.

In such a configuration, in order to cause the gear W to be cut relative to the grinding wheel G, it is necessary to move the table 12 and to move the main shaft 1.
The table driving servo motor 22 and the main shaft driving servo motor 23 are synchronously controlled by the NCl 11 control @ 24 so that the rotation of the table 3 maintains the following relationship determined by the specifications of the gear W to be cut.

If the radius of the generating pitch circle of the gear to be cut is R (m+a), the feed distance of the table 12, LCIII11] the rotation angle of the main shaft 13, θ (deg), then a proportional relationship of −L to θ= can be obtained.

If this relationship is expressed in a graph, it will be a straight line graph as shown in FIG. Therefore, it is sufficient to control both servo motors 22 and 23 simultaneously on two axes for linear interpolation.

Furthermore, when grinding a tooth surface with a bias, it is possible to do so by gradually changing the constant K proportional to the feed distance 11g1L of the table 12.

If this example is expressed in a graph, it will be a circular arc graph as shown in FIG. Therefore, in this case both servo motors 22.2
3 should be controlled by simultaneous two-axis circular interpolation with radius A. still,
In this biased tooth surface grinding, in the conventional device, the radius of the pitch block 16 must be gradually changed with respect to the rotation angle of the main shaft 13.

On the other hand, the cutting operation in the gear grinding process is performed by rotating the spindle drive servo motor 23 independently by an amount equivalent to the cutting depth (this shifts the phase of the synchronous interlock described above), and cuts into the gear W to be cut. By applying rotation, the tooth surface of the gear W to be cut and the grinding surface of the grindstone G are brought closer together. On this occasion,
There is no need to change the relative positional relationship (center distance 111) between the gear W to be cut and the grindstone G.

Furthermore, after the table 12 makes one reciprocation through the above-mentioned operation and generates the tooth surface of one tooth of the workpiece gear W, at the end of the stroke of the table 12 where the workpiece gear W and the grinding wheel G are no longer in meshing contact. Then, the main shaft driving servo motor 23 is rotated by the indexing angle corresponding to one tooth of the gear W to be cut to perform indexing, and then the next tooth surface generation movement is started.

<Effects of the Invention> In addition, according to the present invention, as described in detail with reference to one embodiment, the generation device in the gear grinding machine is controlled by NC, and therefore the following effects are achieved.

(1) Since the dedicated pitch blocks and index plates that were conventionally required depending on the type of gear to be cut are no longer required, setup work is simplified, and a large number of pitch blocks and index plates can be manufactured. There is no need to manage it.

(2) Tooth 1 to be treated like a shaving cutter
Even when applying a bias to the tooth surface of m, the work can be easily carried out since it does not take time to eccentricize the pitch block or attach adjustment pieces.

(3) It becomes possible to perform cutting without changing the relative position between the gear to be cut and the grindstone.

[Brief explanation of the drawing]

Fig. 1 is a block diagram of a gear grinder according to an embodiment of the present invention, Fig. 2 is a block diagram of a gear grinder according to a conventional example, and Fig. 3 is a diagram of the relationship between a grinding wheel and a gear to be cut by generation interlocking. FIGS. 4 and 5 are graphs showing the relationship between the feed distance of the table and the rotation angle of the main shaft. In the drawing, 12 is a table, 13 is a main shaft, 22 is a servo motor for driving the table, 23 is a servo motor for driving the main shaft, and 24 is an NG control device.

Claims (1)

[Claims] In a gear grinding machine that performs grinding by generating a gear to be cut relative to a grinding wheel, a table is supported on a bed so as to be able to reciprocate, and the table rotates around an axis perpendicular to the direction of movement of the table. A main shaft that is movably supported and to which a cut gear is attached, a table driving servo motor that drives the table, a main shaft driving servo motor that drives the main shaft, and an NC capable of synchronously controlling both of the servo motors. A creation device characterized by comprising a control device.