JPH0351062Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a burnishing device for heat-treated workpiece gears, and is particularly concerned with burnishing devices for burnishing heat-treated workpiece gears. The present invention relates to a gear burnishing device that can appropriately remove marks and the like and provide gears with excellent transmission efficiency.

[Prior Art] Gears used in power transmission devices are generally subjected to repeated dynamic loads, so wear resistance and toughness are required, and in order to satisfy both of these requirements, surface heat treatment is applied to gears. Ru. However, due to heat treatment, strain stress is generated inside the gear, resulting in strain deformation, and scratches such as dents occur during processing, making it impossible to obtain a smooth tooth surface.
In addition, before the above treatment, gears have burrs and burrs on each edge of the tooth surface that are generated during cutting, and scale remains after heat treatment, so there is a need for gears that can be removed and shaped to have excellent meshing efficiency. Ta.

In order to achieve this, in the past, manual modification, gear honing, and gear burnishing were performed, but manual modification was not suitable for mass production and had low reliability in terms of accuracy.

On the other hand, to explain correction by gear honing with reference to Figs. 12 to 14, as shown in Fig. 12, gear honing is performed for 30 seconds to remove the height of the dent 8 formed on the tooth surface 3, which is about 30μ. When measured, the height of the dents was reduced to 10μ as shown in Figure 13. Thereafter, in the state shown in FIG. 14, which shows the result of 60 seconds of honing, the height of the dent is 0μ, but undulations 14 are formed on the tooth surface 3 due to the honing. Therefore, gear honing has the disadvantage that not only the correction ability is low, but also surface waviness 14 may occur depending on the honing time.

On the other hand, in gear burnishing, the burnishing gear is pressurized against the workpiece gear so that it meshes with the workpiece gear to correct the problem, but since the gears contact each other unevenly, proper burnishing cannot be achieved. Therefore, manual correction was required, and none of the above methods were suitable for mass production.

In order to improve these shortcomings, the conventional method was to
Gear burnishing is introduced in Publication No. 57-21222. Specifically, as shown in FIG. 15, three gears 13a, 13b, 13 having tooth profiles and tooth intervals formed to mesh with the workpiece gear 1 are used.
c, and the three gears 13a, 13b, 13c
have substantially parallel axes, and further includes a device 11 for changing the relative rotational speed between at least two of the three gears, so that the burnished workpiece gear 1 is transferred to the three gears 13a, 13a, 1
3b, 13c, in which the three gears 13a, 1
3b, 13c each have a mere working pressure angle, the first working pressure angle is larger, the second is smaller, and the third The burnishing device is approximately equal to
The aim is to reshape the tooth surface.

[Problems to be solved by the invention] However, in the three burnishing gears 13a, 13b, and 13c, for example, a borazone electrodeposition layer is formed on the entire meshing surface of the gear 1, and each working pressure angle is Because of these differences, the three gear resistances for gear 1 to be burnished (work gear) do not change until the end of machining, and this not only increases the torque required for shaping, but also increases the reaction As a result, the electrodeposited borazone layer peeled off, resulting in a short service life. Further, it is expensive to form the borazone electrodeposition layer over the entire surface in this way, and when this is reflected on the workpiece gear 1, there is a secondary drawback that the workpiece gear 1 itself becomes expensive.

[Purpose of the invention] This invention was devised to solve the above-mentioned problems, and the purpose of the invention is to eliminate burrs, burrs, etc. remaining on each edge of the tooth surface of a workpiece gear, and dents on the tooth surface after heat treatment. The purpose of the present invention is to provide a gear burnishing device that removes and modifies the gears to form gears with excellent meshing efficiency.

[Summary of the invention] In order to achieve the above-mentioned object, the present invention provides a side shaping gear having borazone reinforcing layers along the tooth thickness direction on both sides of the tooth surface that meshes with the work gear.
A tooth tip forming gear having a working pressure angle larger than the generated pressure angle of the work gear and having a borazone reinforcing layer on the tooth surface, and variably driving it to any one of the above gears. The gear is driven by a drive device that causes the work gear to engage with the work gear, and a pressure device that engages one of the work gears with pressure, thereby making it possible to reliably shape the tooth surface of the gear in a short time.

[Embodiment] Hereinafter, a preferred embodiment of the present invention will be described based on the accompanying drawings.

As shown in Fig. 1, 1 is cut with a rack or hob and then heat treated to obtain a predetermined strength. This is a workpiece gear with marks left behind.

In order to efficiently and reliably remove the burrs, burrs, etc. on the workpiece gear 1, the first and second side shaping gears 2, 6 and the tooth surface shaping gear 7 are meshed with the rotatable workpiece gear 1. It is done by letting.

Specifically, as shown in FIG. 2, on the tooth surface 3a of the first side shaping gear 2, there are grooves arranged at predetermined intervals on both sides in the tooth width direction, and from the tooth bottom 4a toward the tooth tip 4b. A reinforcing layer 5a of borazone (cubic crystal boron) is formed along the tooth bamboo direction. Further, the tooth surface 3a of the first side shaping gear 2 is formed to have a predetermined twist angle θ ₁ with respect to its axial direction.

On the other hand, similarly to the first side shaping gear 2, the second side shaping gear 6 shown in FIG. A borazone reinforcing layer 5a is formed along the tooth thickness direction toward the tip 4b, and has a twist angle θ ₂ in the opposite direction to the thread angle θ 1 of the tooth surface 3b of the first side shaping gear _2. It is formed like this.

On the other hand, as shown in FIG. 4, the tooth surface shaping gear 7 is
The entire surface 7d of the tooth surface 3c that is formed to have a larger working pressure angle than the generated pressure angle of the work gear 1 and meshes with the work gear 1
Alternatively, the borazone reinforcing layer 5a is formed on the root portion 7a.

Therefore, by meshing the first and second side shaping gears 2 and 6 and the tooth surface shaping gear 7 as shown in FIG. 1 with the workpiece gear 1 shown in FIG. Surface 3 is to be shaped.

That is, both sides of the tooth surface 3 of the work gear 1 shown in FIG. 5 in the tooth width direction are the first and second side shaping gears 2,
6, and burrs, burrs, dents, etc. are removed. On the other hand, the tooth surface 3 of the workpiece gear 1 is meshed with the tooth surface shaping gear 7 to shape the root portion 8b, and any burrs, burrs, dents, etc. left therein are removed. Become. Also, since the working pressure angle of this gear 7 is larger than the generated pressure angle of the workpiece gear 1, the white bush shown in FIG. ) Only the tooth tip is work gear 1
It is formed so as to be in contact with the tooth surface 3 of.

As described above, in order to shape the workpiece gear 1, the workpiece gear 1 is rotatably and detachably installed on the workpiece gear shaft 10, as shown in FIG.
First and second side shaping gears 2 and 6 are provided at one end side of first and second side shaping gear shafts 11 and 12 that rotate integrally with the workpiece gear 1, respectively. , the side shaping gear shafts 11 and 12 are provided parallel to the work gear shaft 10. Further, on the other end side of either the first or second side shaping gears 2, 6, a variable speed/torque drive device such as a D or C motor (described later) is provided.
is provided, thereby transmitting the rotational driving force. Further, the work gear 1 is provided with a rotatable tooth flank shaping gear shaft 9 on the tip side of a cylinder rod of a moving means (described later) such as a telescopic fluid cylinder, and the tooth flank shaping gear 7 is mounted on the shaft 9. are integrally provided.

Further, the burnishing device of the present invention will be explained in detail with reference to FIG. The figure is a sectional view taken along the line - in FIG. 1.

As shown in the figure, a work gear shaft 16 on which the work gear 1 is rotatably and removably fitted is mounted on a support base body 15 which is constituted by a frame, and is mounted on a bearing 17.
It is accommodated in the first flanged sleeve 18 via the flange portion thereof, and its flange portion is attached to a movable table 19 movably provided on the support body 15 by, for example, bolts or the like. A sliding base 20 is provided at the lower part of the movable table 19, and this is connected to the support body 1.
It is made movable in the longitudinal direction along the guide groove part 21 provided in 5.

Further, the sliding base 20 is provided with a frame 22, and at an appropriate position on the frame 22 is a rod tip of a first fluid means 23, such as a fluid cylinder, for moving the frame in the operating direction. One end is fixed, and the other end is provided on the support body 15. Further, the frame body 22 includes an arm 22
A is provided integrally with one end of a rotary shaft 24 rotatably provided in the sliding base 20 via a bearing 17, so that the flanged sleeve 18 rotates together with the shaft 24. configured.
On the other hand, first and second side shaping gear shafts 11 are integrally provided on one end side with first and second side shaping gears 2 and 6 that mesh with the work gear 1 so as to surround it. 12 is a second rotatable via bearing 7;
It is accommodated in the third flanged sleeves 25 and 26, and its flange portion is attached to the support body 15.
is integrally attached to. Further, in the embodiment, for example, a transmission gear 27 or the like is provided on the other end side of the first side shaping gear shaft 11, and the drive device is meshed with this. Further, the support body 15 includes a sleeve 28 that pivotally supports the tooth flank shaping gear shaft 9, on which the tooth flank shaping gear 7 is rotatably fitted, for example.
A second fluid means 30 is provided which has a cylinder rod 29 provided thereon in a telescopic manner, and this second fluid means 30 is integrally provided on the support body 15 via a mounting base 31.

Hereinafter, the operation of the embodiment of the present invention will be explained.

As shown in FIG. 7, when the movable table 19 is moved in the meshing direction by the first fluid means 23 in order to mesh with the first and second side shaping gears 2 and 6, this When the rotatable work gear 1 is engaged with, for example, the first side shaping gear 2 as shown in FIG. 8 via the arm 22a, the work gear is rotated together with the arm 22a in the direction of engagement. . Thereafter, the workpiece gear 1 is meshed with the second side shaping gear 6 provided in the rotation direction thereof, and the workpiece gear 1 is meshed with the first and second side shaping gears 2 and 6 as shown in FIG. become. Furthermore, as shown in FIG. 10, the tooth flank shaping gear 7 is meshed with the workpiece gear 1 with a predetermined pressing force by the second fluid means 30 shown in FIG. 6.

Therefore, the workpiece gear 1 receives pressurizing force from three directions, and the workpiece gear 1 (shown in FIG. 5), which has been meshed and shaped by the shaping gears and has reliably smooth tooth surfaces 3, is You will get it.
Note that 31 is a return spring for the arm 22a.

The result of the workpiece gear 1 formed in this way is shown in FIG. 11. The figure is a comparison between a gear burnishing device having the above-mentioned borazone reinforcing layer and a gear burnishing device having no borazone reinforcing layer, and shows the degree of shaping of the dent height with respect to the number of works. The dent height is 30μ, and above the border line is judged as fail, and below the border line is judged as pass.As shown in the figure, the dent height can be set to around 15μ, which is better than the conventional one. It is clear that there has been an improvement.

[Effects of the Invention] As detailed above, the present invention provides the following excellent effects.

(1) The workpiece gear is shaped by being meshed from three directions with no play between the side shaping gear with a borazone reinforcement layer and the tooth flank shaping gear, so the torque required for meshing shaping is reduced and the burr is reliably formed. , burrs, dents, and scales can be removed and shaped.

(2) Since the working pressure angle of the tooth flank shaping gear is made larger than the generated pressure angle of the workpiece gear, the tip of the tooth flank shaping gear does not contact the center of the tooth flank with respect to the tooth flank of the workpiece gear, and this surface It can be shaped without forming surface waviness while ensuring accuracy.

(3) Since workpiece gears can be shaped quickly and reliably, gears can be provided at reduced costs.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram showing a preferred embodiment of the present invention;
2 and 3 are schematic perspective views showing side shaping gears, FIG. 4 is a schematic perspective view showing tooth surface shaping gears,
FIG. 5 is a schematic perspective view showing the work gear of the present invention;
FIG. 6 is a cross-sectional view taken along the - line in FIG. 1, and is a schematic sectional view showing the gear burnishing device of the present invention. FIGS. 7 to 10 are schematic views showing the procedure for shaping a work gear. FIG. A diagram showing a comparison between a gear burnishing device having a borazone reinforcement layer on the side and tooth surface shaping gear and a gear burnishing device without such a layer, FIG. 12 is a diagram showing dents on the tooth surface of a workpiece gear, FIGS. 13 and 14 are views showing the tooth surface of a workpiece gear after burnishing with a conventional burnishing device, and FIG. 15 is a schematic perspective view showing the conventional gear burnishing device. In the figure, 1 is a work gear, 2 and 6 are side shaping gears, and 7 is a tooth surface shaping gear.

Claims (1)

[Scope of utility model registration request] side shaping gears each having a borazone reinforcing layer along the tooth thickness direction on both sides of the tooth surface meshing with the work gear; A gear burnishing device comprising: a tooth surface shaping gear having a borazone reinforcing layer on its surface.