JP7024416B2 - Gear processing equipment equipped with a gear processing tool polishing device, a gear processing tool polishing method, and a gear processing tool polishing device. - Google Patents

Description

The present invention relates to a gear processing device including a gear processing tool polishing device, a gear processing tool polishing method, and a gear processing tool polishing device.

In recent years, gear machining capable of high-speed cutting has been desired from the viewpoint of cost, and skiving machining as described in Patent Document 1 is known. The gear machining tool for skiving machining has a plurality of tool blades on the outer circumference. In skiving, the central axis of the gear material (rotating axis) and the central axis of the gear processing tool (rotating axis) are tilted (having an intersection angle in gear processing), and the gear material and gears are processed. This is a process in which a gear machining tool is relatively moved in the direction of the central axis of the gear material to create a gear in the gear material while the machining tool is rotated synchronously around each central axis.

The tooth surface on one side of the tooth of the gear created by the tool for gear machining by skiving is different from the case where it is machined with the same tool blade due to the ratio of the number of teeth of the tooth to the number of blades of the tool blade. May be processed with. That is, the tooth surface on one side of one tooth may be machined by a plurality of tool blades. This also applies to the tooth surface on the other side of the tooth. In some cases, the facing tooth side surfaces of two adjacent teeth (one tooth side surface of one tooth and the other tooth side surface of the other tooth) may be machined by a plurality of tool blades.

On the other hand, the gear processing tool is manufactured by polishing the tool material with a grindstone. During this polishing, the polishing accuracy of the plurality of tool blades may become non-uniform due to the wear of the grindstone. Therefore, undulations occur on one side of one tooth and the other side of the tooth, and the machining accuracy of the gear tends to decrease. Patent Document 2 describes a processing method for reducing waviness generated on the tooth surface of one tooth.

Japanese Patent No. 4763611 Japanese Unexamined Patent Publication No. 2013-22530

The processing method described in Patent Document 2 is difficult to apply to skiving processing. Therefore, in skiving, a gear machining tool polishing device capable of improving the uniformity of polishing accuracy of a plurality of tool blades in a gear machining tool is desired.

An object of the present invention is a gear processing device including a gear processing tool polishing device capable of improving the uniformity of polishing accuracy of a plurality of tool blades in a gear processing tool, a gear processing tool polishing method, and a gear processing tool polishing device. To provide.

(Tool polishing device for gear processing)
The tool polishing device for gear processing according to the present invention is for polishing the blade side surfaces of a plurality of tool blades formed on the outer periphery of a gear processing tool for cutting a gear with a grind wheel formed in a disk shape. It is a tool polishing device for gear machining provided with a control device for controlling, and the control device performs one said tooth based on the number of blades of the tool blade of the gear machining tool and the number of teeth of the gear. A group determining unit that determines a plurality of the tool blades to be cut as one group for all the teeth, and the group for each non-overlapping group among the determined groups. It is provided with a polishing portion for polishing the side surface of the tool blade belonging to the above with the grind wheel.

(Tool polishing method for gear processing)
The tool polishing method for gear processing according to the present invention is for gear processing in which the side surfaces of a plurality of tool blades formed on the outer periphery of a gear processing tool for cutting a gear are polished by a grindstone formed in a disk shape. In the tool polishing method, a plurality of the tool blades for cutting one tooth are determined as one group based on the number of tool blades of the gear processing tool and the number of teeth of the gear. The group determination step performed on all the teeth and the blade side surface of the tool blade belonging to the group for each non-overlapping group among the determined group are polished by the grindstone. It is equipped with a polishing process.

According to the tool polishing device for gear processing and the tool polishing method for gear processing according to the present invention, a plurality of tool blades involved in cutting one tooth are grouped, and therefore, a plurality of tool blades belonging to the group are grouped. If the tool blades are continuously polished, the uniformity of the polishing accuracy of the plurality of tool blades can be improved. Therefore, it is possible to suppress a decrease in cutting accuracy of the gear teeth.

(Gear processing equipment)
Since the gear processing device according to the present invention includes the above-mentioned gear processing tool polishing device, it is possible to control the polishing process of the gear processing tool on the machine of the gear processing device. Therefore, since the gear cutting process can be continued without removing the gear processing tool, the cutting efficiency can be improved.

It is a figure of the tool polishing apparatus for gear processing provided with a grindstone which targets the tool for gear processing for polishing. It is a figure seen from the IB direction of FIG. 1A. It is a gear processing tool for cutting a gear, and is the figure of the gear processing tool as a polishing target. It is a figure of a grindstone for polishing a tool for gear processing. It is a side view of a gear as a cutting object. It is a figure of the gear processing apparatus which targets a gear to cut and is equipped with a gear processing tool. It is a figure which shows the control device of the tool polishing apparatus for gear processing. It is a flowchart for demonstrating operation of the control apparatus of the tool polishing apparatus for gear processing. It is a figure for demonstrating the cutting order at the time of cutting a gear tooth with a tool blade of a gear processing tool. It is a figure for demonstrating the polishing order at the time of polishing a tool blade of a gear processing tool with a grindstone. It is a figure which shows the error of each tool blade of the gear processing tool at the time of polishing in the polishing order of FIG. It is a figure which shows the state of the tooth of a gear at the time of cutting with the tool blade of the gear processing tool of FIG. It is a table showing the relationship of cutting involvement of the tool blade of the gear processing tool at the position in the tooth streak direction of the gear tooth. It is a figure which shows the polishing state of the tool blade of the 1st group determined by the table of FIG. It is a figure which shows the polishing state of the tool blade of the 2nd group determined by the table of FIG.

(1. Tool polishing device for gear processing)
The gear processing tool polishing apparatus of this embodiment will be described with reference to FIGS. 1A and 1B. The gear processing tool polishing device 20 is provided with a control device 30 (see FIG. 6) described later, and a grindstone 3 is used to polish the blade side surface of the gear processing tool 2 for cutting the gear 1 (see FIG. 4). It is a device to perform. In this example, the gear processing tool polishing device 20 is arranged in the gear processing device 10 (see FIG. 5) described later, and polishes the gear processing tool 2 on the machine of the gear processing device 10. Therefore, the cutting process of the gear 1 can be continued without removing the gear processing tool 2, so that the cutting efficiency can be improved. However, it may be configured as a device different from the gear processing device 10.

The gear processing tool polishing device 20 includes a spindle unit 21 that rotatably supports the gear processing tool 2 to be polished on a bed (not shown) around the center axis X2 (θ22) of the gear processing tool 2. .. Further, the gear processing tool polishing device 20 includes a grindstone base 22 that rotatably supports the grindstone 3 around the central axis X3 (θ3) of the grindstone 3.

Here, the outline of the shapes of the gear processing tool 2, the grindstone 3, and the gear 1 will be described with reference to FIGS. 2 to 4. As shown in FIG. 2, the shape of the gear machining tool 2 includes a plurality of tool blades 2a on the outer periphery around the central axis X2. The gear machining tool 2 includes a rake face 2s on the end face in the axial direction. The rake face 2s may be formed in a tapered shape centered on the central axis X2 of the gear processing tool 2, or may be formed in a surface shape facing different directions for each tool blade 2a.

Further, the circumscribed circles of the plurality of tool blades 2a of the gear processing tool 2 are formed in a truncated cone shape. That is, the tip surfaces of the plurality of tool blades 2a are front clearance surfaces having a front clearance angle α with respect to the rake surface 2s. Therefore, the distance from the central axis X2 of the gear machining tool 2 on the cutting edge surface gradually decreases from one end surface of the tool blade 2a toward the blade line direction (equal to the blade groove direction).

Further, the blade side surfaces of the plurality of tool blades 2a are side clearance surfaces having a side clearance angle γ with respect to the rake surface 2s. Further, the plurality of tool blades 2a have a helix angle β with respect to the central axis X2. However, the helix angle β of the tool blade 2a is appropriately different depending on the helix angle of the tooth 1a of the gear 1 and the crossing angle η (see FIG. 1B) between the helix 1 and the gear machining tool 2 in the gear machining apparatus 10. .. Therefore, the tool blade 2a may not have the helix angle β. In this example, the helix angle β and the crossing angle η are the same.

As shown in FIG. 3, the grindstone 3 targets the gear processing tool 2 as a polishing target, and the blade side surfaces 2b and 2c (see FIG. 2) of the tool blade 2a of the gear processing tool 2 and the rake surface 2s as necessary. To polish. The grindstone 3 is formed in a disk shape around the central axis X3. However, the outer peripheral surface of the grindstone 3 is formed in a shape corresponding to the shape of the blade groove of the gear processing tool 2.

As shown in FIG. 4, the shape of the gear 1 to be cut includes a plurality of teeth 1a on the peripheral surface around the central axis X1. Then, the tooth side surfaces 1b and 1c of the tooth 1a of the gear 1 are cut by the tool blade 2a of the gear processing tool 2. In the present embodiment, the gear 1 is an external gear as an example, but an internal gear can also be applied. Further, in FIG. 4, although the spur gear is taken as an example of the gear 1, various gears such as a helical gear can be applied.

As shown in FIGS. 1A and 1B, the grindstone base 22 is tilted by the crossing angle η from the state where the central axis X2 of the gear processing tool 2 and the central axis X3 of the grindstone 3 are orthogonal to the spindle unit 21. It is possible to make adjustments, and it is possible to move relative to the spindle unit 21 in three orthogonal axes. The crossing angle η between the grindstone base 22 and the spindle unit 21 is adjusted according to the helix angle β of the gear machining tool 2.

The spindle unit 21 and the grindstone base 22 may be relatively movable, and the spindle unit 21 may be movable. Then, by positioning the spindle unit 21 and the grindstone base 22, the central axis X2 of the gear processing tool 2 and the central axis X3 of the grindstone 3 are positioned so as to have an intersection angle η. In this state, the gear processing tool 2 is rotated around the central axis X2 (θ22).

Further, the grindstone wheel 3 is rotated around the central axis X3 (θ3). Further, the grind wheel 3 synchronizes with the rotation of the gear processing tool 2 in the central axis X2 direction (M31) of the gear processing tool 2, the radial direction of the gear processing tool 2 (M32), and the gear processing. The tool 2 moves in the rotational tangential direction (translational direction) (M33). In this way, the blade side surfaces 2b and 2c of the tool blade 2a of the gear processing tool 2 are polished.

The grindstone 3 may reciprocate while rotating along the blade line of the tool blade 2a of the gear processing tool 2, or may move in only one direction. Further, in the present embodiment, the grindstone 3 grinds the blade side surface 2b or 2c on one side of the tool blade 2a of the gear processing tool 2, respectively, but simultaneously performs the opposite blade side surfaces 2b and 2c of the adjacent tool blades 2a. It may be polished, or even if the rotation direction of the gear processing tool 2 changes, it may follow so that the above polishing can be performed according to the rotation direction of the gear processing tool 2.

(2. Gear processing equipment)
Next, the gear processing device 10 that cuts the tooth side surfaces 1b and 1c of the gear 1 will be described with reference to FIG. In the present embodiment, the gear processing device 10 creates or recreates the tooth 1a of the gear 1 by skiving with the gear processing tool 2, and creates or recreates the tool blade 2a of the gear processing tool 2 with the grindstone 3. It is a device for polishing. As the gear processing device 10, for example, a machining center, particularly a 5-axis machining center having three orthogonal axes and two rotating axes is applied in addition to a spindle that supports a rotary tool.

The gear processing device 10 includes a spindle unit 11 that can move in three orthogonal axes on a bed (not shown), and a gear processing tool 2 attached to the tip of the spindle unit 11. Therefore, the gear processing tool 2 can rotate around the central axis X2 (θ21) of the gear processing tool 2 and can move in the direction orthogonal to the bed in three axes.

Further, the gear processing device 10 includes a rotary table 12 that supports the gear 1 as a cutting target. The rotary table 12 rotatably supports the gear 1 around the central axis X1 of the gear 1 (θ1). The rotary table 12 is provided so as to be swingable (tilt) with respect to the bed around one axis different from the rotary axis of the rotary table 12. That is, the rotary table 12 supports the gear 1 so that it can be tilted (tilted).

Then, by positioning the spindle unit 11 and the rotary table 12, the central axis X1 of the gear 1 and the central axis X2 of the gear processing tool 2 are positioned so as to have an intersection angle. In this state, the gear 1 is rotated around the central axis X1 (θ1). In synchronization with the rotation of the gear 1, the gear processing tool 2 is rotated around the central axis X2 (θ21) and relatively moved in the central axis X1 direction (M2) of the gear 1. In this way, the gear 1 is created.

(3. Control device for tool polishing device for gear processing)
Next, the control device 30 of the gear processing tool polishing device 20 will be described. The control device 30 is a device that controls polishing by improving the uniformity of accuracy of a plurality of tool blades 2a of the gear machining tool 2 and suppressing a decrease in machining accuracy of the gear 1.

That is, as described in the background technology, the tooth side surface 1b on one side of the tooth 1a of the gear 1 created by the gear processing tool 2 by skiving is the number of teeth of the tooth 1a and the number of blades of the tool blade 2a. Depending on the ratio, it may be machined with the same tool blade 2a or with a different tool blade 2a. That is, the tooth side surface 1b on one side of one tooth 1a may be machined by a plurality of tool blades 2a. This also applies to the tooth side surface 1c on the other side of the tooth 1a.

Specifically, the description will be given focusing on the tooth side surface 1b on one side of the tooth 1a. For example, as shown in FIG. 8, the gear 1 having six teeth 1a (the reference numerals are clockwise 1a1,1a2,1a3,1a4,1a5,1a6) is rotated counterclockwise, and the four tool blades 2a It is assumed that the gear processing tool 2 having (the reference numerals are attached counterclockwise as 2a1,2a2, 2a3, 2a4) is rotated clockwise for cutting.

In this case, first, the tool blade 2a1 cuts the tooth side surface 1b1 of the tooth 1a1. Next, the tool blade 2a2 cuts the tooth side surface 1b2 of the tooth 1a2. Next, the tool blade 2a3 cuts the tooth side surface 1b3 of the tooth 1a3. Next, the tool blade 2a4 cuts the tooth side surface 1b4 of the tooth 1a4. Since the gear machining tool 2 goes around in the above cutting process, the tool blade 2a1 cuts the tooth side surface 1b5 of the tooth 1a5. Next, the tool blade 2a2 cuts the tooth side surface 1b6 of the tooth 1a6.

Since the gear 1 makes one round in the above cutting process, in the next round, the tooth side surface 1b1 of the tooth 1a1 is cut by the tool blade 2a3, and the tooth side surface 1b2 of the tooth 1a2 is cut by the tool blade 2a4. From the above, the tooth side surface 1b1 of the tooth 1a1, the tooth side surface 1b3 of the tooth 1a3, and the tooth side surface 1b5 of the tooth 1a5 are repeatedly cut by the tool blade 2a1 and the tool blade 2a3, and the tooth side surface 1b2 of the tooth 1a2 and the tooth 1a4 of the tooth 1a2. The tooth side surface 1b4 and the tooth side surface 1b6 of the tooth 1a6 are repeatedly cut by the tool blade 2a2 and the tool blade 2a4.

On the other hand, the gear processing tool 2 is manufactured by polishing the tool material with a grindstone 3. During this polishing process, the polishing accuracy of the plurality of tool blades 2a may become non-uniform due to the wear of the grindstone 3. Therefore, undulations occur on the tooth side surface 1b of one tooth 1a, and the machining accuracy of the gear 1 tends to decrease.

Specifically, as shown in FIG. 9, it is assumed that the gear processing tool 2 having four tool blades 2a1, 2a2, 2a3, 2a4 is rotated clockwise and polished by the grindstone 3. In this case, first, the grindstone 3 polishes the blade side surface 2b1 of the tool blade 2a1. Next, the grindstone 3 polishes the blade side surface 2b2 of the tool blade 2a2. Next, the grindstone 3 polishes the blade side surface 2b3 of the tool blade 2a3. Finally, the grindstone 3 polishes the blade side surface 2b4 of the tool blade 2a4.

As a result, as shown in FIG. 10, the blade side surface 2b1 of the tool blade 2a1 is polished to a shape close to the ideal shape, but the blade side surface 2b2 of the tool blade 2a2, the blade side surface 2b3 of the tool blade 2a3, and the tool blade 2a4. The blade side surface 2b4 is polished into a shape (shown by a solid line in the figure) in which the error e2, e3, and e4 from the ideal shape (shown by a single point chain line in the figure) increases as the polishing progresses.

Therefore, the tooth side surface 1b of the tooth 1a has a swell in the tooth streak direction. Therefore, the machining accuracy of the gear 1 is lowered.
Specifically, as shown in FIG. 11, for example, it is assumed that the tooth side surface 1b1 of the tooth 1a1 is cut in the order of the tool blade 2a1, the tool blade 2a3, and the tool blade 2a1. Then, a region A cut by the tool blade 2a1, a region B cut by the tool blade 2a3, and a region C cut by the tool blade 2a1 are formed on the tooth side surface 1b1 of the tooth 1a1 in the tooth streak direction. Since the blade side surface 2b3 of the tool blade 2a3 has an error e3 with respect to the blade side surface 2b1 of the tool blade 2a1, undulation occurs on the tooth side surface 1b1 of the tooth 1a1. Waviness also occurs in the tooth side surface 1b2-1b6 of the other teeth 1a2-1a6.

In order to reduce the above-mentioned waviness, a plurality of tool blades 2a involved in cutting the tooth side surface 1b of one tooth 1a are classified into one group. Similarly, a plurality of tool blades 2a involved in cutting the tooth side surface 1b of another tooth 1a are also classified into a group. Then, an arbitrary one group is selected from the plurality of classified groups, and the plurality of tool blades 2a belonging to the selected group are sequentially polished. After that, this polishing process is also performed on the remaining groups. As a result, the plurality of tool blades 2a belonging to one group have a small error with respect to the ideal shape, so that the waviness generated on the tooth side surface 1b of one tooth 1a can be suppressed.

Specifically, the tool blades 2a1-2a4 involved in cutting the tooth side surface 1b1-1b6 of each tooth 1a1-1a6 can be represented by the table shown in FIG. When a non-overlapping group is selected from this table, the tool blades 2a1 and the tool blades 2a3 can be classified into the first group, and the tool blades 2a2 and the tool blades 2a4 can be classified into the second group. Then, first, as shown in FIG. 13A, the blade side surface 2b1 of the tool blade 2a1 belonging to the first group is polished by the grindstone 3, and then the blade side surface 2b3 of the tool blade 2a3 is polished by the grindstone 3. Next, as shown in FIG. 13B, the blade side surface 2b2 of the tool blade 2a2 belonging to the second group is polished by the grindstone 3, and then the blade side surface 2b4 of the tool blade 2a4 is polished by the grindstone 3.

As a result, the tool blades 2a1 and the tool blades 2a3 belonging to the first group have a small error with respect to the ideal shape, so that the waviness generated on the tooth side surfaces 1b1, 1b3, 1b5 of each tooth 1a1, 1a3, 1a5 can be suppressed, respectively. .. Further, since the tool blades 2a2 and the tool blades 2a4 belonging to the second group have a small error with respect to the ideal shape, the waviness generated on the tooth side surfaces 1b2, 1b4, 1b6 of each tooth 1a2, 1a4, 1a6 can be suppressed, respectively.

As shown in FIG. 6, the control device 30 of the gear processing tool polishing device 20 includes a group determination unit 31, a processing state analysis unit 32, and a polishing processing unit 33. The control device 30 controls the polishing process for forming the tool blade 2a with respect to the tool material of the gear processing tool 2. Further, the control device 30 controls the polishing process on the tool blade 2a of the gear processing tool 2 that is worn by the cutting process and needs to be re-polished.

The group determination unit 31 determines a plurality of tool blades 2a for cutting one tooth 1a as one group based on the number of blades of the tool blade 2a of the gear processing tool 2 and the number of teeth of the tooth 1a of the gear 1. This process is performed on all teeth 1a. Specifically, a table as shown in FIG. 12 is created from the number of blades 4 of the tool blades 2a1-2a4 and the number of teeth 6 of the teeth 1a1-1a6 of the gear machining tool 2 shown in FIG. Then, with reference to the created table, a group consisting of a plurality of tool blades 2a involved in cutting the tooth side surface 1b1-1b6 of each tooth 1a1-1a6, that is, a first group consisting of the tool blades 2a1 and the tool blades 2a3. A second group consisting of the tool blades 2a2 and the tool blades 2a4 is determined.

The machining state analysis unit 32 analyzes the machining state of the gear machining tool 2. Specifically, the machining state analysis unit 32 analyzes the machining state of the gear machining tool 2 using the number of gears 1 cut by the gear machining tool 2 or the total cutting time as an index. That is, the tool blade 2a of the gear machining tool 2 wears out depending on the number of gears 1 cut or the total cutting time, and the machining accuracy of the cut gear 1 decreases. Therefore, the number of gears 1 cut or the total cutting By using the machining time as an index, it can be determined whether or not the gear machining tool 2 needs to be reground. Further, in the tool blade 2a of the gear machining tool 2, the machining accuracy of the cut gear 1 is lowered because the tool blade 2a is worn out, and therefore the machining accuracy of the gear 1 is used as an index. By doing so, it can be determined whether or not the gear machining tool 2 needs to be reground.

The polishing unit 33 grinds the blade side surface 2b of the tool blade 2a belonging to the non-overlapping group among the plurality of determined groups based on the machining state of the gear machining tool 2 with the grindstone wheel 3. do. Specifically, for example, if the first group is determined to be the first order and the second group is determined to be the second order, for example, the tool blade 2a1 belonging to the first group is polished, and then the tool blade 2a3 is polished. Next, for example, the tool blade 2a2 belonging to the second group is polished, and then the tool blade 2a4 is polished. The order of the groups is arbitrary, and the order of polishing within the group is also arbitrary.

The polishing unit 33 rotates the gear processing tool 2 provided in the spindle unit 21 around the central axis X2 (θ22) when the blade side surface 2b of the tool blade 2a is ground by the grindstone 3. A rotary drive motor (not shown) for rotating the grindstone 3 provided on the drive motor and the grindstone base 22 around the central axis X3 (θ3) is driven and controlled. Further, the grindstone base 22 is used in the central axis X2 direction (M31) of the gear processing tool 2, the radial direction (M32) of the gear processing tool 2, and the rotational tangential direction (translation direction) of the gear processing tool 2. The ball screw mechanism and the drive motor shown in the figure are driven and controlled. Further, the drive motor (not shown) that swings the rotary table 12 is driven and controlled.

(4. Operation of the control device of the tool polishing device for gear processing)
Next, the operation of the control device 30 of the gear processing tool polishing device 20 (the gear processing tool polishing method) will be described with reference to the drawings. In this example, a case where the polishing process is controlled for the tool blade 2a of the gear processing tool 2 that is worn by the cutting process and requires re-polishing will be described. Since the tool blade 2a of the gear processing tool 2 is coated to increase the hardness, it is necessary to remove the film by another device before re-polishing and to coat it by another device after re-polishing.

The control device 30 has one tooth based on the number of blades of the tool blade 2a of the gear processing tool 2 supported by the spindle unit 21 and the number of teeth 1a of the gear 1 to be cut by the gear processing tool 2. A plurality of tool blades 2a for cutting 1a are determined as one group (step S1 in FIG. 7, group determination step). Then, the control device 30 determines whether or not the group determination process has been performed on all the teeth 1a (step S2 in FIG. 7), and if the group determination process has not been performed on all the teeth 1a, the step. The process returns to S1 and the above process is repeated.

On the other hand, when the group determination process is performed on all the teeth 1a, the control device 30 sets the blade side surface 2b of the tool blade 2a belonging to the group for each non-overlapping group among the determined groups. Polish with a grindstone 3. That is, the control device 30 moves and controls the grindstone base 22 to move the grindstone 3 to the rake face 2s side of the gear machining tool 2, and the central axis X2 of the gear machining tool 2 and the central axis X3 of the grindstone 3. Positioning is performed so that the wheel and the wheel have an intersection angle (step S3 in FIG. 7, polishing process). In this state, the gear machining tool 2 is rotated around the central axis X2 (θ22), and the grindstone 3 is rotated around the central axis X3 (θ3), and the blade side surface 2b of the tool blade 2a belonging to the above group is used as a grindstone. Polish with a wheel 3 (step S4 in FIG. 7, polishing process).

Then, the control device 30 determines whether or not the polishing of the tool blades 2a belonging to all the groups is completed (step S5 in FIG. 7), and when the polishing of the tool blades 2a belonging to all the groups is not completed. Returns to step S3 and repeats the above process. On the other hand, in step S5, when the polishing of the tool blades 2a belonging to all the groups is completed, the grindstone 3 is moved to the retracted position and stopped (step S6 in FIG. 7), and the grindstone 3 and the gear machining tool are stopped. The rotation of No. 2 is stopped (step S7 in FIG. 7), and all the processes are completed.

(5. Others)
In the above-described embodiment, the tool blade 2a of the grouped gear machining tool 2 is designed so that there is no tool blade 2a that straddles two or more groups. However, if the tool blade 2a straddles two or more groups, the tool blade Make 2a belong to any one group and perform polishing.

Further, in particular, the rotation axis of the gear processing tool 2 and the rotation axis of the gear 1 (workpiece) are not vertical, and the rotation of the gear processing tool 2 and the gear 1 (workpiece) is synchronized at high speed. The method of rotating and machining (gear skiving) enables highly efficient machining, but as the cutting amount and feed amount of machining increase, the cutting load increases and the amount of wear of the gear machining tool 2 increases. Will increase.

Then, a plurality of tool blades 2a of the gear processing tool 2 are machined in the tooth trace direction of the gear 1 (workpiece), and the tooth trace accuracy (tooth profile accuracy) of the gear 1 (workpiece) is highly accurate. In the above gear processing tool polishing device 20 (gear processing tool polishing method, gear processing device), a plurality of tool blades for processing the tooth trace direction of one tooth of the gear 1 (workpiece) are to be maintained. It is possible to adjust the blade shape (blade side surface, blade edge surface, etc.) of 2a (polish to a similar shape, etc.), and keep the tooth trace accuracy (tooth profile accuracy) of the gear 1 (workpiece) ideally. The blade shape can be similar (gear processing tool 2).

1: Gear, 1a: Tooth, 2: Gear processing tool, 2a: Tool blade, 3: Grindstone, 20: Gear processing tool polishing device, 21: Spindle unit, 22: Grindstone stand, 30: Control device, 31 : Group determination unit, 32: Machining state analysis unit, 33: Polishing processing unit

Claims (8)

Gear machining tool polishing equipped with a control device that controls the polishing process by grinding the blade sides of multiple tool blades formed on the outer circumference of the gear machining tool that cuts the gear with a grindstone formed in a disk shape. It ’s a device,
The control device is
All the teeth are subjected to a process of determining a plurality of the tool blades for cutting one tooth as one group based on the number of blades of the tool blade of the gear processing tool and the number of teeth of the gear. Group decision department and
Of the plurality of determined groups, a polishing unit that grinds the blade side surface of the tool blade belonging to the group for each non-overlapping group with the grindstone, and a polishing unit.
A tool polishing device for gear machining. The gear processing tool polishing device according to claim 1, wherein the control device controls the polishing process with respect to the tool material of the gear processing tool. The gear processing tool polishing device according to claim 1, wherein the control device controls the polishing process for the gear processing tool that requires re-polishing. The control device includes a machining state analysis unit that analyzes the machining state of the gear machining tool.
The gear processing tool polishing apparatus according to claim 3, wherein the polishing unit polishes the blade side surface of the tool blade with the grindstone based on the processing state of the gear processing tool. The gear polishing tool according to claim 4, wherein the machining state analysis unit analyzes the machining state of the gear machining tool using the number of the gears cut by the gear machining tool or the total cutting time as an index. Device. The gear processing tool polishing apparatus according to claim 4, wherein the processing state analysis unit analyzes the processing state of the gear processing tool using the processing accuracy of the gear cut by the gear processing tool as an index. A gear processing tool polishing method in which the side surfaces of a plurality of tool blades formed on the outer periphery of a gear processing tool for cutting a gear are polished by a grindstone formed in a disk shape.
All the teeth are subjected to a process of determining a plurality of the tool blades for cutting one tooth as one group based on the number of blades of the tool blade of the gear processing tool and the number of teeth of the gear. Group determination process for
Of the plurality of determined groups, the polishing process of polishing the blade side surface of the tool blade belonging to the group for each non-overlapping group with the grindstone, and the polishing process.
A tool polishing method for gear machining. A gear processing device that cuts the gear with the gear processing tool.
A gear processing device comprising the tool polishing device for gear processing according to any one of claims 1-6.

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