JP2002103139A - Gear grinding method, turret head for gear grinding, and gear grinding tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a gear grinding machining method capable of reducing the manufacturing cost by adding a machining function by a worm grinding wheel to a function of a composite machine tool having the flexibility, to integrate the gear grinding machining and the other machining, to reduce the plant and equipment investment, and to reduce a machining time and a moving time between process steps. SOLUTION: In a composite machining NC lathe 1 having a main spindle 13, and a blade table 3 movable to the main spindle 13, a ground gear W on which the grinding machining is to be executed, is mounted on the main spindle 13, the worm grinding wheel 10 is mounted on a tool shaft 11 of a turret head T for gear grinding, the tool shaft 11 is placed with a crossed axes angle θto the main spindle 13 to engage the ground gear W with the worm grinding wheel 10, the ground gear W and the worm grinding wheel 10 are synchronously rotated, and the worm grinding wheel 10 is moved in the direction of the main spindle 13 to execute the grinding machining.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gear grinding method implemented on a general-purpose compound machine tool such as an NC lathe or a machining center, and a gear grinding method suitable for implementing the gear grinding method. Turret head and gear grinding tool.

[0002]

2. Description of the Related Art In order to complete a gear, machining steps such as turning, gear cutting, and gear finishing are required. Gear finishing is performed by shaving with a gear shaving machine or grinding with a gear grinder. I have.

FIG. 6 is a transparent perspective view showing a schematic configuration of a gear grinding machine 70. The gear grinding by the gear grinder 70 refers to mounting a worm-type grinding wheel 72 on a tool shaft 71 and mounting a work gear W on a revolving table 73 in a direction perpendicular to the rotation axis 71 of the worm-type grinding wheel 72. The tool shaft 71 is rotatably mounted on the shaft 74, and the tool shaft 71 is tilted and fixed so that the tooth trace direction of the worm-type grinding wheel 72 and the tooth trace direction of the work gear W are substantially parallel to each other. 72 and the gear W to be machined, and the worm-type grinding wheel 7
2 and the turning gear 7 while rotating the cutting gear W.
This is a machining method for performing gear finishing by moving the workpiece 3 in the direction of the mounting shaft 74 of the gear W to be machined.

[0004]

As described above, the grinding by the worm-type grinding wheel 72 is performed by using the dedicated gear grinding machine 70. Therefore, in order to perform other processes such as turning and gear cutting other than the grinding process, it is necessary to perform a processing device for that purpose and a work of transporting the gear to be processed between the processing devices. In this way, complex machining including gear finishing is
Significant costs are required for preparing a plurality of processing apparatuses, securing an installation space for the processing apparatuses, transporting a cutting gear between the processing apparatuses, and changing the setup of each processing apparatus. For this reason, complex machining including gear finishing has become a major bottleneck in high-mix low-volume production.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional drawbacks, and an object of the present invention is to add a machining function using a worm-type grinding wheel to the function of a versatile compound machine tool, and to perform gear grinding. Provided is a gear grinding method capable of reducing manufacturing costs by consolidating processing and other processing, suppressing capital investment, reducing processing time, and reducing time between processes. It is in. It is also an object of the present invention to provide a turret head for gear grinding and a gear grinding tool suitable for carrying out the above-mentioned gear grinding method.

[0006]

Means and Effects for Solving the Problems Claim 1
The gear grinding method of the first embodiment includes a first rotating shaft 13, 28 and a second rotating shaft 13, 28 which is relatively movable with respect to the first rotating shaft 13, 28.
In the compound machine tool 1, 20 having a rotating shaft 11, wherein the first rotating shafts 13, 28 and the second rotating shaft 11 can be arranged with an intersection angle therebetween, the first rotating shaft 1
Attach a grinding gear W to be subjected to grinding to 3, 28,
A worm-type grinding wheel 10 is attached to the second rotating shaft 11, and the first rotating shafts 13 and 28 and the second rotating shaft 11 are arranged at an intersection angle θ so that the cut gear W and the worm The grinding wheel W
And the worm-type grinding wheel 10 are synchronously rotated, and the worm-type grinding wheel 10 is
Grinding is performed by relatively moving in the 3 and 28 directions.

According to the gear grinding method of the first aspect, the meshed work gear W and the worm-type grinding wheel 10 are synchronously rotated, and the worm-type grinding wheel 10 is rotated.
Is relatively moved in the direction of the first rotating shafts 13 and 28, that is, in the axial direction of the gear W to be machined, so that the grinding of the gear W to be machined by the worm-type grinding wheel 10 can be performed. Thus, the versatile compound machine tool 1,
Also in 20, the grinding of the gear W to be machined can be performed.

Therefore, according to the gear grinding method of the first aspect, it is possible to consolidate the gear grinding step and other processing steps, thereby suppressing capital investment, reducing the processing time, and reducing the inter-step moving time. Due to the reduction or the like, the manufacturing cost can be reduced. This reduction in manufacturing cost is particularly effective in the case of high-mix low-volume production. In recent years,
With the improvement of cold forging technology, gear teeth forged and forged have been formed with high precision, and it has become possible to complete gears only by turning and gear grinding, With the above processing method, a greater cost reduction effect can be obtained.

A turret head for gear grinding according to a second aspect of the present invention is a multi-tasking machine tool 1 having a spindle 13 driven to rotate and a tool rest 3 movable relative to the spindle 13.
A turret head T for grinding a gear W to be used for grinding a gear W to be machined, comprising a main body 8 mounted on the tool rest 3 and a rotation axis L orthogonal to the main shaft 13.
A swinging unit 9 having a tool shaft 11 rotatably mounted around the rotation axis L2 orthogonal to the rotation axis L1 and being attached to the main body unit 8 so as to be rotatable around 1; And a worm-type grinding wheel 10 to be attached.

According to the turret head for gear grinding according to the second aspect of the present invention, the turret head can be mounted on the tool post 3 of the compound machine tool 1.
The worm-type grinding wheel 10 is engaged with the worm-type grinding wheel 10 by rotating the work gear W and the worm-type grinding wheel 10 synchronously and moving the worm-type grinding wheel 10 relatively in the direction of the main shaft 13. Grinding of the work gear W can be performed. Therefore, NC
The above-described grinding can be performed by using the combined machine tool 1 such as a lathe, and it is possible to consolidate with other processing steps, and it is possible to reduce the manufacturing cost. In addition, since the crossing angle θ can be adjusted, a single turret head can grind various types of gears having different torsion angles, thereby reducing manufacturing costs by reducing the number of tools.

A gear grinding tool according to a third aspect of the present invention is a compound machine tool having a main shaft that is driven to rotate and a rotary shaft that is relatively movable with respect to the main shaft and that is orthogonal to the main shaft. , A gear grinding tool A used for grinding a gear W to be machined, comprising a mounting portion 31 mounted on a main shaft 26, and a tool shaft 11 for mounting a worm-type grinding wheel 10, Tool axis 11
Are arranged so as to have an intersection angle θ with respect to the rotation shaft 28, and further include a transmission mechanism 37 for transmitting the rotation of the mounting portion 31 to the tool shaft 11.

According to the gear grinding tool of the third aspect, the worm-type grinding wheel 10 can be fitted to the main shaft 26 of the compound machine tool 20, so that the worm-type grinding wheel 10 is engaged with the gear W attached to the rotating shaft 28. By simultaneously rotating the work gear W and the worm-type grinding wheel 10 and relatively moving the worm-type grinding wheel 10 in the direction of the rotating shaft 28, the work gear W by the worm-type grinding wheel 10 is obtained.
Grinding can be performed. For this reason, the above-mentioned grinding can be performed by using the complex machine tool 20 such as a machining center, and it is possible to integrate with other processing steps, and it is possible to reduce the manufacturing cost.

According to a fourth aspect of the present invention, in the gear grinding tool, the mounting portion 31 is configured to be detachable from the main shaft 26, and the mounting portion 31 and the tool shaft 11 are removed when the mounting portion 31 is removed from the main shaft 26. And a rotation restricting means 34 for restricting the relative rotation with respect to.

According to the gear grinding tool of the fourth aspect, since the attachment portion 31 is detached from the main shaft 26, the rotation regulating means 34 for regulating the relative rotation between the attachment portion 31 and the tool shaft 11 is provided. At the end of the grinding process and at the start of the grinding process, the relative rotation position between the mounting portion 31 and the worm-type grinding wheel 10 in the gear grinding tool A is maintained in a constant relationship. Therefore, at the start of the grinding process, the positioning operation between the worm-type grinding wheel 10 and the work gear W can be easily and accurately performed, and the advantages of reducing the manufacturing cost and improving the processing accuracy are surely obtained. In addition, since it is detachable with respect to the main shaft 26, it can be removed when not needed, so that the mounted portion of the main shaft 26 can be used effectively and the gear grinding tool A can be easily repaired and inspected. Have.

Further, the gear grinding tool according to claim 5 is characterized in that the mounting portion 31 is configured to be capable of automatically changing tools.

According to the gear grinding tool of the fifth aspect, the working efficiency can be further improved.

A gear grinding tool according to a sixth aspect of the present invention is characterized in that the mounting portion 31 is formed of a tapered shank fitted into a mounting hole 26a provided in the main shaft 26.

According to the gear grinding tool of the sixth aspect, the gear grinding tool is suitable for implementation.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, specific embodiments of a gear grinding method and a turret head for gear grinding according to the present invention will be described in detail with reference to the drawings. In the present embodiment, a compound machining NC lathe, which is a general-purpose compound machine tool, is used as a gear grinding device.

FIG. 1 is an explanatory view for explaining the configuration of the combined machining NC lathe 1, and FIG.
FIG. 1B is a perspective view showing the external appearance of FIG. 1B, and FIG. 1B is a front view showing a schematic configuration of the combined machining NC lathe 1. The combined machining NC lathe 1 includes a base 2 and a tool post 3 arranged on the top of the base 2.
And a work table 4 arranged on the side of the base 2.

The tool rest 3 includes a Z-axis stand 5, an X-axis stand 6, a Y-axis stand
The headstock 7 is provided. The Z-axis base 5 is the base 2
And is movably provided in a Z-axis direction set in parallel with the upper surface of the base 2. Also, X
The headstock 6 is disposed above the Z-headstock 5, and
Are provided so as to be movable in an X-axis direction which is parallel to the upper surface and orthogonal to the Z-axis. Further, the Y-axis table 7 is disposed on a side portion located on one side in the movement direction of the X-axis table 6, and is provided so as to be movable in a Y-axis direction orthogonal to both the X-axis and the Z-axis. As a result, the Y-axis table 7 can move in three orthogonal directions including the X-axis, the Y-axis, and the Z-axis. A gear grinding turret head T is mounted on the Y-axis stand 7.

The turret head T for gear grinding includes a holder machine frame 8, a swinging part 9, and a worm-type grinding wheel 10. The holder machine frame 8 is a substantially disk-shaped member, and is attached to a side portion of the Y-axis base 7 opposite to the X-axis base 6. In addition, the swing part 9
Is attached to the side of the holder machine frame 8 (the side opposite to the Y-axis stand 7) and is provided so as to be rotatable (in the direction of arrow B) about a rotation axis L1 parallel to the X-axis. And
The swing unit 9 has a tool shaft (second rotation shaft) 11 on one end side,
A worm-type grinding wheel 10 is detachably attached to the tool shaft 11. The tool shaft 11 is provided to be rotatable around a rotation axis L2 orthogonal to the X axis.

Therefore, in the combined machining NC lathe 1, the worm-type grinding wheel 10 can be angularly displaced in the direction of arrow B by angularly displacing the swinging portion 9. As shown in FIG. 2, the worm-type grinding wheel 10 is a grindstone in which a trapezoidal grinding protrusion 10a that forms a tooth profile curve of the gear W to be ground is formed in a screw shape. When the worm-type grinding wheel 10 is not used, for example, as shown in FIG.
The tool shaft 11 is accommodated in the tool accommodating portion 12 shown in (b), and the tool shaft 11 can be used by attaching another rotary blade (a drill or the like).

On the other hand, the work table 4 is disposed adjacent to a side portion of the base 2 which is located on one side in the X-axis direction. The work table 4 has a main shaft (first rotation shaft) 13 rotatable around a rotation axis parallel to the Z axis. Further, a chuck 14 for holding the gear W to be cut is attached to the main shaft 13.

The moving direction and the moving amount of the X-axis table 6, the Y-axis table 7, and the Z-axis table 5 are controlled by a controller (not shown).
As a result, the worm-type grinding wheel 1
0 can be moved in three orthogonal directions. The rotational speeds of the tool shaft 11 and the main shaft 13 are controlled by the control device, and thereby the rotational speeds of the worm-type grinding wheel 10 and the gear W to be machined are controlled.

Next, the procedure of the gear grinding method will be described. First, the X-axis table 6, the Y-axis table 7, and the Z-axis table 5 are moved, and the swing unit 9 is displaced by a predetermined angle to position the worm-type grinding wheel 10 at a processing start position for the gear W to be machined. . The processing start position is defined as the worm-type grinding wheel 10
Is located at one end side of the gear W to be machined, and the tool shaft 11 has a predetermined intersection angle θ with respect to the main shaft 13 such that the tooth trace direction of the gear W to be machined matches the lead angle of the worm-type grinding wheel 10. , And the teeth of the gear W to be machined and the grinding wheel 1
This is a position where the 0 grinding protrusion 10a meshes with an ideal state. The ideal state described here refers to a grinding state in which the tooth surface created on the work gear W coincides with the finished tooth surface, and further, the work gear W whose predetermined allowance is ground by the grinding protrusion 10a. And the finished tooth surface of the gear W to be machined.

FIG. 2 is a front view showing the positional relationship between the gear W to be machined and the worm-type grinding wheel 10. FIG. 2 (a)
The positional relationship when the gear W to be machined is a spur gear is shown. In the spur gear, the tooth trace direction is parallel to the rotation axis, and the torsion angle β is 0, so that the tooth trace direction is parallel to the main shaft 13. On the other hand, in the worm-type grinding wheel 10, the grinding protrusion 10a
Are formed in a right-handed screw shape, and are inclined at a lead angle α. Therefore, in order to make this lead angle coincide with the tooth trace direction of the gear W to be machined, it is necessary to incline the tool axis 11 clockwise with respect to the vertical direction when viewed from the front by the lead angle α. In this case, the intersection angle θ is 90 ° + α. still,
The lead angle α is a helical angle with respect to the rotation axis of the worm-type grinding wheel 10, and the torsion angle β is an angle formed between the rotation axis of the gear W to be machined and the tooth trace direction.

FIG. 2B shows the positional relationship when the gear W to be cut is a right-hand helical gear. A right-handed helical gear is a helical gear whose other end is twisted clockwise when viewed from one end. In the right-hand helical gear, the tooth trace direction is inclined by a twist angle β with respect to the rotation axis, and the inclination direction is the direction in which the other end of the tooth faces downward when viewed from the worm-type grinding wheel 10 side. Therefore, in order to make the lead angle coincide with the tooth trace direction of the gear W to be machined, it is necessary to incline the tool shaft 11 counterclockwise by a twist angle β-lead angle α when viewed from the front with respect to the vertical direction. . In this case, the intersection angle θ is 90 ° + α−β.

FIG. 2C shows the positional relationship when the gear W to be machined is a left-handed helical gear. A left-handed helical gear is a helical gear whose other end is twisted leftward when the teeth are viewed from one end. In the left-handed helical gear, the tooth trace direction is inclined by a twist angle β with respect to the rotation axis, and the inclination direction is the direction in which the other end of the tooth faces upward when viewed from the worm-type grinding wheel 10 side. Therefore, in order to make the lead angle coincide with the tooth trace direction of the gear W to be machined, it is necessary to incline the tool shaft 11 clockwise with respect to the vertical direction by a twist angle β + lead angle α when viewed from the front. The intersection angle in this case is 90 ° + α + β.

After the above-described positioning of the gear W and the worm-type grinding wheel 10 is completed, the gear W and the worm-type grinding wheel 10 are synchronously rotated at a certain common ratio, and the worm-type grinding wheel 10 is rotated. Is moved in the direction of the main shaft 13 (Z-axis direction) to grind the gear W to be cut. Synchronous rotation at a constant common ratio means rotating the gear W by one pitch for one rotation of the worm-type grinding wheel 10.

As described above, according to the present embodiment, gear grinding can be performed using the versatile combined machining NC lathe 1. Therefore, it is possible to consolidate the gear grinding process and other processing steps (for example, turning and gear cutting), and to reduce the capital investment, reduce the processing time, reduce the moving time between processes, etc., and thereby reduce the manufacturing cost. Can be reduced. This reduction in manufacturing cost is particularly effective in the case of high-mix low-volume production. In recent years, with the improvement of cold forging technology, gear materials that have been toothed and forged have been formed with high precision, making it possible to complete gears only by turning and gear grinding. Therefore, the above-described processing method can provide an even greater cost reduction effect.

In addition, since the crossing angle θ can be adjusted, a single turret head T can grind various kinds of gears W having different torsion angles, thereby reducing manufacturing costs by reducing the number of tools. Can be planned.

Although the specific embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, and can be implemented with various modifications within the scope of the present invention. For example, in the above-described embodiment, the gear grinding method is performed in the combined machining NC lathe 1, but it can be performed in another combined machine tool.

FIG. 3 is a perspective view showing the external appearance of a machining center 20 for performing the gear grinding method. The machining center 20 includes a base 21, a Z-axis column 22 and an X-axis table 23 arranged on the base 21. The Z-axis column 22 is provided movably in the Z-axis direction set parallel to the upper surface of the base 21. On the other hand, the X-axis table 23 is provided movably in the X-axis direction parallel to the upper surface of the base 21 and orthogonal to the Z-axis.

A Y-axis slider 24 is mounted on the Z-axis column 22. The Y-axis slider 24 is disposed on the side of the Z-axis column 22 on the side of the X-axis table 23, and is provided so as to be movable in the Y-axis direction orthogonal to both the X-axis and the Z-axis. Further, a spindle head 25 is attached to a side portion of the Y-axis slider 24 on the X-axis table side. The spindle head 25 supports the spindle 26 so as to be rotatable around a rotation axis parallel to the Z axis. Then, the gear grinding tool A is mounted on the main shaft 26.

On the other hand, above the X-axis table 23, a work table 27 is mounted. The work table 27 is provided with a rotation shaft (first rotation shaft) 28 that can rotate around a rotation axis parallel to the Y axis. The gear W to be cut is attached to the rotating shaft 28. The work gear W is mounted so that its axis is parallel to the Y axis.

X-axis table 23, Y-axis slider 24, Z
An X-axis motor M1, a Y-axis motor M2, a Z-axis motor M3, a main shaft motor M4, and a rotation shaft motor M5 are connected to the shaft column 22, the main shaft 26, and the rotation shaft 28, respectively. Further, each of the motors M1 to M5 has an encoder E1 to E5.
Is connected. Each of the encoders E1 to E5 detects a rotation angle of each of the motors M1 to M5, and outputs a detected value to a control device (not shown). This control device includes encoders E1 to E1.
The rotation of the motors M1 to M5 is controlled based on the detection value from E5. That is, the moving direction and the moving amount of the X-axis table 23, the Y-axis slider 24, and the Z-axis column 22 are controlled, and the rotation speeds of the main shaft 26 and the rotating shaft 28 are controlled. Thereby, the gear grinding tool A and the work gear W can be relatively moved in the three orthogonal directions, and the number of rotations of the worm-type grinding wheel 10 and the work gear W of the gear grinding tool A can be controlled. it can.

The main shaft 26 has a portion where a tool is attached,
A mounting hole 26a is formed as a mounting portion into which the taper shank of the tool is fitted, and the holder main body 30 of the gear grinding tool A detachably mounted on the main shaft 26.
As shown in FIG. 4, a tapered shank 3
1 and is attached to the main shaft 26 by a pull bolt (not shown) of the main shaft 26.

The holder body 30 is rotatably held by a holder casing 33 via a bearing 32.
The holder casing 33 includes a holder body 3 at the time of detachment.
A rotation restricting means 34 for restricting the rotation of zero is provided. The rotation restricting means 34 is composed of a detent member slidably provided on the holder casing 33, and is provided with a key groove (not shown) provided on the holder main body 30 when it is moved to one side (the left side in FIG. 4). To prevent the rotation of the holder main body 30 with respect to the holder casing 33. The detent member 34 is normally urged leftward (in the direction of rotation regulation) by a spring 35, and the holder main body 30 is attached to the main shaft 26.
The rotation preventing member 34 comes into contact with the end surface (side surface) of the spindle head 25 and is pushed rightward (in the direction of releasing the rotation restriction), thereby separating from the key groove and releasing the rotation restriction. Have been.

The rotation restricting means 34 for restricting the relative rotation between the taper shank 31 and the tool shaft (second rotary shaft) 11 when the taper shank 31 is detached from the main shaft 26 as described above is provided. This is because the relative rotation position between the taper shank 31 and the worm-type grinding wheel 10 in the gear grinding tool A is maintained in a constant relationship at the end of the grinding process and at the start of the grinding process. That is, at the start of the grinding process, the positioning operation between the worm-type grinding wheel 10 and the work gear W is performed easily and accurately.
When the holder main body 30 is attached to the main shaft 26, the holder main body 30 is held so as not to rotate relative to the mounting hole 26 a of the main shaft 26, and is provided so as to be rotated by the rotational force of the rotation motor M <b> 4 of the main shaft 26.

The holder casing 33 rotatably holds the tool shaft 11 via a bearing 36 at the other end of the holder body 30. The worm-type grinding wheel 10 is fixed to the tool shaft 11. Also, the tool shaft 11
Are arranged at an inclination angle with respect to the rotation axis of the holder body 30 as shown in FIG. Become. The rotational force of the holder main body 30 is transmitted to the tool shaft 11 via the transmission mechanism 37.

The transmission mechanism 37 includes a first gear 38 fixed to the other end of the taper shank 31 in the holder body 30 and a worm-type grinding wheel 1 in the tool shaft 11.
The second gear 39 is fixed to the other end of the first gear 0 and a third gear 40 meshed with the first and second gears 38 and 39. The rotation shaft 40A of the third gear 40
Is rotatably held by the holder casing 33 via a bearing 41. The first to third gears 3
8, 39 and 40 are all formed of bevel gears.

Next, the procedure of the gear grinding method will be described. First, the X-axis table 23, the Y-axis slider 24, and the Z-axis column 22 are moved to position the worm-type grinding wheel 10 at the processing start position for the gear W to be machined. Then, after the positioning is completed, the grinding gear W and the worm-type grinding wheel 10 are rotated synchronously, and the worm-type grinding wheel 10 is moved in the direction of the rotation shaft 28 (Y-axis direction). Perform processing.

Using an NC lathe (model MT-250) manufactured by Mori Seiki, machining is performed based on the specifications of the gear W to be cut, the specifications of the present gear grinding tool A, and the grinding conditions of the NC lathe shown in Table 1 below. did.

[0045]

[Table 1]

As a result of the grinding, a tooth profile shown in FIG. 5 was obtained. When the number of teeth of the work gear W is 36 in the clockwise direction, No. 1 in order from No. 1 and tooth No. Tables 2 and 3 show the measurement results of the tooth profile of the left tooth surface and the right tooth surface of Nos. 1, No10, No19, and No28.

[0047]

[Table 2]

[0048]

[Table 3]

According to the measurement results of the tooth profile described above, the tooth profile error is 13.1 μm at the maximum, and the JIS class 3 standard (13
μm or less), and the tooth trace error is a maximum of 16 μm, which falls within the JIS Class 3 standard (17 μm or less). Therefore, it can be seen that the JIS Class 3 standard can be obtained even with the present gear grinding tool A, which is comparable to the conventional machining method.

In this embodiment, the same effects as in the above-described embodiment can be obtained. In the gear grinding tool A according to the present embodiment, the inclination angle of the tool shaft 11 is fixed,
Therefore, when the gear grinding tool A is mounted, the rotating shaft 2
Cannot be adjusted, but since the gear grinding tool A is detachably attached to the main shaft 26, a plurality of gear grinding tools A having different inclination angles are prepared, and the gear is changed by the automatic tool changing function. If the grinding tool A is replaced, the intersection angle θ can be adjusted. by this,
It is possible to perform grinding of various types of machined gears W having different torsion angles.

Further, when the taper shank 31 is detached from the main shaft 26, the rotation regulating means 34 for regulating the relative rotation between the taper shank 31 and the tool shaft 11 is provided. In the above, the relative rotational position between the taper shank 31 and the worm-type grinding wheel 10 in the gear grinding tool A is maintained in a constant relationship. Therefore, at the start of the grinding process,
The work of aligning the worm-type grinding wheel 10 and the gear W to be machined can be performed easily and accurately, and the advantages of reducing the manufacturing cost and improving the processing accuracy can be surely obtained.

Further, the gear grinding tool A can be attached only when the grinding is performed, and the gear grinding tool A can be detached when performing another machining, and another machining tool can be attached using the attached portion. Moreover, when the gear grinding tool A is repaired and inspected, it can be easily repaired by removing it.

The rotational force of the holder body 30 is applied to the tool shaft 1
1, the gear (first gear 38) of the holder main body 30 and the gear (second gear 3) fixed to the tool shaft 11 are transmitted.
9) can be directly meshed with each other without passing through the third gear 40. However, the rotation of the first gear 38 of the holder main body 30 is controlled by the second gear 3 of the tool shaft 11 as in the above embodiment.
Preferably, the third gear 40 for transmitting the rotation to the tool shaft 9 is provided, so that it is possible to accurately cope with a slight angle of the tool shaft 11 with respect to the rotation axis of the holder body 30 of 25 ° or less. Advantages arise.

[Brief description of the drawings]

FIG. 1 is an explanatory view for explaining a configuration of a compound machining NC lathe used in a gear grinding method according to an embodiment of the present invention, wherein (a) is a perspective view and (b) is a front view. It is.

FIG. 2 is a front view showing a positional relationship between a work gear and a worm-type grinding wheel.

FIG. 3 is a perspective view showing an appearance of a machining center used in another embodiment.

4A and 4B show a configuration of a gear grinding tool mounted on the machining center, wherein FIG. 4A is a horizontal sectional view and FIG. 4B is a vertical sectional view.

FIG. 5 is a graph showing a tooth profile of a work gear ground by the gear grinding tool.

FIG. 6 is a perspective view for explaining a conventional technique.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 combined machining NC lathe 3 turret 4 work table 8 holder machine frame 9 oscillating unit 10 worm-type grinding wheel 11 tool axis (second rotation axis) 13 main axis (first rotation axis) 20 machining center 26 main axis 26a mounting hole 27 Work table 28 Rotary shaft (first rotary shaft) 31 Taper shank 34 Rotation restricting means 37 Transmission mechanism A Gear grinding tool T Turret head W Work gear θ Crossing angle

Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (reference) // B23B 3/16 B23B 3/16 A 11/00 11/00

Claims (6)

[Claims] A first rotating shaft (13), (28) and a second rotating shaft (11) movable relative to the first rotating shaft (13) (28); 1st rotation axis (13)
In the compound machine tool (1) (20) configured so that the (28) and the second rotating shaft (11) can be arranged with a crossing angle, the first rotating shafts (13) and (28) are ground. The work gear (W) on which the second rotation shaft (1) is attached is attached.
1) A worm-type grinding wheel (10) is attached to the first rotating shaft (13) (28) and the second rotating shaft (11) are arranged so as to have an intersection angle (θ) and the workpiece is cut. Gear (W)
And the worm-type grinding wheel (10) are engaged with each other, and the work gear (W) and the worm-type grinding wheel (10) are synchronously rotated, and the worm-type grinding wheel (1) is rotated.
0) is relatively moved in the direction of the first rotation shafts (13) and (28) to perform grinding. 2. A multi-purpose machine tool (1) having a rotating spindle (13) and a tool rest (3) movable relative to the spindle (13). )
A turret head (T) for grinding a gear used for grinding a main body (8) mounted on the tool rest (3) and a rotation axis (L) orthogonal to the main shaft (13).
1) A swinging part (9) that is attached to the main body part (8) so as to be rotatable around and has a tool shaft (11) that is driven to rotate about a rotation axis (L2) orthogonal to the rotation axis (L1). ), And a worm-type grinding wheel (10) detachably attached to the tool shaft (11). 3. A main shaft (26) that is driven to rotate and is relatively movable with respect to the main shaft (26).
6) A gear grinding tool (A) used for grinding a gear (W) in a compound machine tool (20) having a rotation axis (28) orthogonal to the axis (2),
6) has a mounting part (31) to be mounted on, and a tool axis (11) for mounting a worm-type grinding wheel (10), and the tool axis (11) intersects the rotation axis (28). A gear grinding tool characterized by being provided with an angle (θ) and further having a transmission mechanism (37) for transmitting rotation of the mounting portion (31) to the tool shaft (11). 4. The mounting part (31) includes the main shaft (26).
When the attachment portion (31) is detached from the main shaft (26), the attachment portion (3) is detachable.
The gear grinding tool according to claim 3, further comprising a rotation restricting means (34) for restricting a relative rotation between the tool shaft (1) and the tool shaft (11). 5. The gear grinding tool according to claim 3, wherein the attachment portion (31) is configured to be capable of automatically changing a tool. 6. The mounting part (31) is provided with the main shaft (2).
The gear grinding tool according to any one of claims 3 to 5, comprising a tapered shank fitted into the mounting hole (26a) provided in (6).