JPH0966333A - Finish form rolling device for hot rolled gear - Google Patents

Abstract

PROBLEM TO BE SOLVED: To finish-roll a gear with high precision in the finish form rolling of a hot rolled gear. SOLUTION: In finish rolling a rolled gear 7' by rotating synchronously with it and advancing simultaneously with it a pair of finish roller dies 33, 43, which is arranged so as to hold the hot rolled gear 7' in between, the phase of the rolled gear 7' is detected in a non-contact state in accordance with its appearance; and on the basis of this detected signal, the phase of the pair of finish roller dies 33, 43 is decided so as to meet the phase of the rolled gear 7'. In addition, the length in the radial direction of the rolled gear 7' is detected in a non-contact state in accordance with its appearance; and on the basis of this detected signal, the advance quantity is decided for the pair of finish roller dies 33, 43.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a finish rolling apparatus for hot rolling gears for finish rolling a hot rolled rolling gear. INDUSTRIAL APPLICABILITY The present invention can be applied to, for example, manufacture of a flywheel including a tooth portion of a vehicle and a gear of a drive system.

[0002]

2. Description of the Related Art Gears are generally manufactured by subjecting a disc-shaped material to hob cutting and shaving finishing. However, in this method, when the outer diameter and the tooth width of the gear are increased, the production efficiency is deteriorated and the cost is increased. Therefore, in the industry, a technique for creating the tooth portion of the gear by hot rolling has been developed. To manufacture gears by hot rolling, heat the rough material by high-frequency heating, etc., and rotate it while pressing the roller dies from both sides to the outer peripheral portion of the heated rough material, Create the teeth of. In order to improve the accuracy of the gear, the gear manufactured by hot rolling is generally finish-rolled warm or cold after hot rolling.

Finish rolling is usually performed using a pair of finish roller dies arranged so as to sandwich the rolled gear after hot rolling. In this case, one finishing roller die is rotated and brought into contact with the rolling gear, and the tooth groove of the finishing roller die and the tooth groove of the rolling gear are aligned with each other, and then the other finishing roller die is finished with the above one finishing roller die. Finish rolling is performed by pushing in the rolling gear while synchronously rotating in phase with the roller die.

[0004]

However, in the above-described conventional finish rolling method, one of the finish roller dies is first rolled when the tooth groove of the finishing roller die and the tooth groove of the rolling gear are in phase with each other. Since the gear is brought into contact with the other finishing roller die and then the other finishing roller die is brought into contact with the gear, there is a problem that in the case of warm rolling, the rolling gear has temperature unevenness, which causes deterioration in accuracy. In addition, one of the finishing roller dies that comes into contact with the rolling gear first comes into contact with the rolling gear in a state of not being in phase with the rolling gear, which causes a problem that a dent may be formed on the rolling gear. .

Further, in the conventional finish rolling method, the finish roller die is uniformly pushed by a predetermined pushing amount regardless of the diameter of the rolled gear after hot rolling, so There is a problem in that it is difficult to secure the accuracy of the gear because the dimensional error may cause an excess or deficiency in pushing the finishing roller die. The present invention has been made in view of the above circumstances, and in finish rolling of a hot-rolled gear, it is a technical problem to be solved to finish roll the rolled gear with higher accuracy.

[0006]

A finish rolling apparatus for a hot-rolled gear according to claim 1, which solves the above-mentioned problems, comprises a pair of hot-rolled gears arranged so as to sandwich the hot-rolled gear. Is a device for finish rolling the rolling gear by pushing the finishing roller die of the rolling gear synchronously with the rolling gear, the phase of the rolling gear depending on the external shape of the rolling gear. And a phase determination means for determining the phase of the pair of finishing roller dies so as to match the phase of the rolling gear according to a detection signal of the phase detection means. Characterize.

In the finish rolling device according to the first aspect, the phase of the rolling gear is detected by the phase detecting means in a non-contact manner, and the phase of the pair of finish roller dies is changed by the phase determining means in response to the detection signal. In order to match the phase of the forming gear, both finishing roller dies can be pushed into the rolling gear at the same time in a state of being in phase with each other. For this reason, it is possible to prevent the occurrence of temperature unevenness due to the finishing roller die coming back and forth and contacting the rolling gear, and the occurrence of dents due to the finishing roller die coming into contact with the rolling gear with a phase shift. Is possible.

According to another aspect of the present invention, there is provided a finish rolling device for a hot-rolled gear, comprising a pair of finish roller dies arranged so as to sandwich the hot-rolled rolled gear. By pushing the rolling gear while rotating it synchronously,
A device for finish rolling the rolled gear, comprising radius detecting means for non-contactly detecting the radial length of the rolling gear according to the outer shape of the rolling gear, and the radius detecting means And a pushing amount determining means for determining the pushing amount of the pair of finishing roller dies according to the detection signal.

In the finish rolling apparatus according to the second aspect, the radial length of the rolling gear is detected by the radius detecting means in a non-contact manner, and the pushing amount determining means determines the pair of finish rollers in response to the detection signal. In order to determine the pushing amount of the die, the pushing amount of the finishing roller die can be finely adjusted according to the outer diameter of each rolling gear to be finish-rolled. Therefore, there is no excess or deficiency in pushing the finishing roller die due to a dimensional error during hot rolling.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of a finish rolling apparatus for hot-rolled gears according to the present invention will be described below with reference to the drawings. The finish rolling apparatus is incorporated in a hot rolling gear manufacturing apparatus that manufactures a gear by hot rolling and finish rolling a blank (coarse material). 3 is an embodiment relating to both the finish rolling device and the finish rolling device according to claim 2.

First, the overall construction of the hot-rolled gear manufacturing apparatus will be described with reference to FIG. FIG. 1 is a plan view of the entire apparatus. FIG. 2 is a front view of the main part. In FIG. 1, the blank holding unit 1 includes a first blank holding unit 11 having a large diameter first holding shaft 11a facing each other, and a second blank holding unit 12 having a large diameter second holding shaft 12a. It is composed of.

When the first motor 21 functioning as a blank rotating means is driven, the first blank holding portion 11 is rotated in its circumferential direction (direction of arrow E1 in FIG. 2). Further, a second motor 22 for carrying a blank for moving the first blank holding unit 11 is provided. Second motor 2
When 2 rotates, the ball screw shaft 24 rotates in the circumferential direction, and the first blank holding portion 11 and thus the blank 7 are conveyed in the directions of the arrows Y1 and Y2.

Further, in FIG. 1, when the third motor 23 functioning as a blank rotating means is driven, the second transmission torque variable clutch 26 (eg, powder clutch) is used to drive the second motor.
The blank holder 12 is rotated in the circumferential direction thereof, that is, in the same direction as the rotation direction of the first blank holder 11. When the hydraulic cylinder 29 for transporting the second blank holding unit 12 is driven, the second blank holding unit 12 moves the ball spline 2
6f moves toward the first blank holding portion 11 in the direction of the arrow Y3, and the blank 7 can be sandwiched between the second blank holding portion 12 and the first blank 11 for pressure bonding.

A high frequency heating coil 28 functioning as a ring-shaped heating means for inductively heating the blank 7 is arranged in front of the first blank holding portion 11.
The heating condition of the blank by the high frequency heating coil 28 is detected by the temperature sensor 28c which is a radiation thermometer. The roller pushing device 3 is composed of a pair of first roller pushing device 31 and second roller pushing device 41 arranged so as to sandwich the blank 7 in the radial direction of the blank. The first roller pushing device 31 includes a first roller die 32 that functions as a rolling tool for hot working, a first finishing roller die 33 that functions as a finishing rolling tool for warm finishing, and a first roller. A first connecting shaft 34 that directly coaxially connects the die 32 and the first finishing roller die 33, and a first housing 36 that rotatably holds the first roller die 32 and the first finishing roller die 33 are provided. . Further, the first roller pushing device 31 is used for the first die pushing motor 2
4 and the first ball screw shaft 37.

In FIG. 1, similarly, the second roller pushing device 41 has a second roller die 42 which functions as a rolling tool for hot working and a second roller die 42 which functions as a finishing rolling tool for warm finishing. The finishing roller die 43, the second connecting shaft 44 that directly connects the second roller die 42 and the second finishing roller die 43 coaxially, and the rotatably holding the second roller die 42 and the second finishing roller die 43. And a second housing 46. Further, the second roller pushing device 41
Is the second die pushing motor 25, the second ball screw shaft 4
7 and 7.

The first housing 36 can be pushed into the blank 7 in the arrow X1 direction and can be separated from the blank 7 in the arrow X2 direction. The second housing 46 can be pushed into the blank 7 in the arrow X1 direction and can be separated from the blank 7 in the arrow X2 direction. As can be understood from FIG. 1, the first housing 36 has a planar “U” shape, and has two thick first facing wall portions 36 a and 36 b facing each other,
It is provided with a thick first continuous wall portion 36c that connects the first facing wall portions 36a and 36b to each other. Similarly, the second housing 46 is also in the shape of a U-shape in plan view, and has two thick opposing second opposing wall portions 46a and 46b and a thickness connecting the second opposing wall portions 46a and 46b to each other. Second meat wall 4
6c and.

As can be seen from FIG. 2, the first housing 3
6 and the second housing 46 are arranged so as to be movable in the directions of the arrows X1 and X2 along the guide portion 3b of the base 3a that supports them. Now, in FIG. 1, when the first die pressing motor 24 is driven, the driving force is decelerated by the first reduction gear 24i and transmitted to the first ball screw shaft 37, and the first ball screw shaft 37 moves in the circumferential direction thereof. The first housing 36 is rotated, whereby the first housing 36 is conveyed in the direction of the arrow X1 and, by extension, the first housing 36 is held by the first housing 36.
The roller die 32 and the first finishing roller die 33 are conveyed in the same direction and are pushed into the rolling gear 7 ′ obtained by hot rolling the blank 7.

When the first die pushing motor 24 moves in the reverse direction, the first ball screw shaft 37 rotates in the reverse direction in the circumferential direction thereof, whereby the first housing 36 is conveyed in the arrow X2 direction and the first roller is moved. The die 32 and the first finishing roller die 33 are conveyed in the same direction and separated from the rolling gear 7 ′. Therefore, the first die pushing motor 24 and the first ball screw shaft 37 function as pushing driving means for pushing the first roller die 32 and the first finishing roller die 33 into the blank 7 or the rolling gear 7 ′.

Similarly, in FIG. 1, when the second die pushing motor 25 is driven, the driving force is reduced by the second speed reducer 25i and transmitted to the second ball screw shaft 47, which in turn drives the second ball screw shaft 47. Rotation in the circumferential direction of the
The housing 46 is conveyed in the arrow X1 direction, the second roller die 42 and the second finishing roller die 43 are conveyed in the same direction, and are pushed into the rolling gear 7 '.

When the second die pushing motor 25 moves in the reverse direction, the second ball screw shaft 47 reversely rotates in the circumferential direction thereof, whereby the second housing 46 is conveyed in the direction of the arrow X2, and the second roller die. 42 and the second finishing roller die 43 are conveyed in the same direction and separated from the rolling gear 7 ′. Therefore, the second die pushing motor 25 and the second ball screw shaft 47 function as pushing driving means for pushing the second roller die 42 and the second finishing roller die 43 into the blank 7 or the rolling gear 7 '.

The load acting on the first housing 36 is detected by the first load cell 36r, and the first housing 36
The amount of movement of is detected by the first linear scale 36k. The load acting on the second housing 46 is detected by the second load cell 46r, and the movement amount of the second housing 46 is the second amount.
It is detected by the linear scale 46k. Each detection signal is input to the control system.

The first die pushing motor 24 and the second die pushing motor 25 described above are servo motors, respectively, and are controlled by a pushing synchronizing command signal, a separation synchronizing command signal, etc. from the control system, and the first ball screw shaft. 37 and the second ball screw shaft 47 are operated in synchronization. This makes the first
The roller die 32 and the second roller die 42 may be pushed in synchronously in the direction of arrow X1 or may be separated synchronously in the direction of arrow X2.

In FIG. 1, when the die rotation motor 5, which is a servo motor, is driven by a drive command signal from the control system, the first speed reducer 52 operates via the speed reducing gears 50 and 51, and further rotates. Through the shaft 52e and the first constant velocity universal joint 53, the first connecting shaft 34, the first finishing roller die 33, and the first roller die 32 rotate together to perform rolling.

Further, the driving force of the die rotating motor 5 is supplied to the second connecting shaft 44, the second finishing roller die through the phase adjusting mechanism 55x, the second speed reducer 55, the rotating shaft 55e and the second constant velocity universal joint 56. 43, second roller die 4
2 is transmitted to these, these are rotated, and rolling is performed. The phasing mechanism 55x corresponds the circumferential phase of the machining teeth of the first roller die 32 to the circumferential phase of the machining teeth of the second roller die 42.
And the second roller die 42 have a function of eliminating the phase difference between the dies. For example, the phasing mechanism 55x can be configured by a pair of board bodies 55y in which a large number of engaging teeth extending in the radial direction are arranged in a row in the circumferential direction, and a connecting means for connecting the pair of board bodies 55y. The die phase difference can be adjusted by adjusting the meshing position of the engaging teeth in the circumferential direction of the body 55y.

Next, the holding mechanism of the blank holding portion 1 will be described with reference to FIG. That is, as shown in FIG. 3, the first blank holding portion 11 has a highly rigid first holding shaft 11a having a first conical surface 11c having an outer diameter that decreases toward the tip, and the insertion of the first holding shaft 11a. An actuating shaft 14 slidably inserted into the hole 11d, a sleeve-like tightening body 15 engaged with a collar portion 14c at the tip of the actuating shaft 14 and arranged at the tip of the first holding shaft 11a, and a radial direction. Collet 1 that functions as an engaging claw that can be displaced outward, that is, in the direction of arrow C1.
6 and a ring-shaped pressing body 17 held by a bolt (not shown) on the tip surface of the first holding shaft 11a.

In FIG. 3, when the operating shaft 14 is actuated in the direction of arrow D1, the tightening body 15 is displaced in the same direction, whereby the conical surface 15h of the tightening body 15 becomes the conical surface 16 of the collet 16.
When t is strongly pressed, the collet 16 is displaced in the direction of the arrow C1, whereby the collet 16 moves toward the inner wall surface 7 of the central hole of the blank 7.
1 is urged in the direction of the arrow C1 so that the first blank holder 1
The blank is held at 1.

The second blank holding portion 12 is provided with a press-fitting hole 18 formed at the tip of the shaft and a ring-shaped pressing body 19 held at the tip of the shaft by a bolt (not shown). A guide wall surface 18k having a slight taper is formed in the press-fitting hole 18. Then, in order to hold the blank 7, when the first blank holding portion 11 and the second blank holding portion 12 relatively come close to each other in the axial direction, as shown in FIG. The press-fitting hole 18 of the holding shaft 12a is press-fitted into the tightening body 15. Then, the displacement of the tightening body 15 in the radial direction is restricted. Therefore, the force by which the collet 16 restrains the blank 7 becomes highly rigid, and the first blank holding portion 11
The blank 7 is firmly held by the second blank holding portion 12. Therefore, the blank 7 held by the first blank holding portion 11 and the second blank holding portion 12 cannot substantially float in the pushing direction, that is, the directions of the arrows X1 and X2, and is a non-floating type which is also called a fixed type.

Next, the finish rolling apparatus of this embodiment will be further described. As described above, the pair of finishing roller dies 33 and 43 are arranged so as to sandwich the rolling gear 7 ′, and the pair of finishing roller dies 33 and 43 are
The rolling gear 7 ′ can be finish-rolled by being pushed while being synchronously rotated into the rolling gear 7 ′. As shown in FIG. 4, the rolling gear 7 ′ located at the finish rolling position R2
A light projecting portion 61 and a light receiving portion 62 are provided on both sides of the end surface near the outer peripheral edge of the device at positions separated from the end surface by a predetermined distance. The light projecting unit 61 may be any one that can emit parallel light such as laser light, and a laser irradiation device is used in this embodiment. The light projecting portion 61 is arranged so that the parallel light emitted from the light projecting portion 61 is applied to the teeth formed on the outer peripheral edge of the rolling gear 7 ′, and the light projecting portion 61 is provided at a position facing the light projecting portion 61. A light receiving unit 62 is provided. The light receiving section 62 may be any one as long as the tooth profile of the rolling gear 7 ′ is irradiated with parallel light from the light projecting section 61 so that the tooth profile is projected and the brightness of the tooth profile can be detected.
An image sensor is adopted in this embodiment. According to such a light projecting unit 61 and the light receiving unit 62, by emitting parallel light from the light projecting unit 61, as shown in FIG. It is projected, and the tooth-shaped dark portion 7a is formed. The light projecting portion 61 and the light receiving portion 62 are provided with a light projecting angle adjusting mechanism 63,
When the rolling gear 7'has a helical tooth shape, the projection angle can be made parallel to the tooth trace angle.

Then, the light receiving portion 6 including the image sensor
The detection signal detected in 2 is input to the computer 65 via the sensor controller 64. Computer 65
Then, the deviation (Δθ) between the phase of the rolling gear 7 ′ and the phase of the reference gear from the bright and dark part edges x ₁ and x ₂ and the rolling gear 7 ′.
The difference (Δr) between the radius of the circle and the radius of the reference gear is calculated.
An output signal corresponding to the phase shift (Δθ) is sent from the computer 65 to the die rotation motor (servo motor) 5 via the first servo amplifier 66, and the first finishing die roller 33 and the second finishing die roller The phase of 43 is matched with the phase of the rolling gear 7 '. Also, the rolling gear 7 '
The output signal corresponding to the radius difference (Δr) of the computer 6
5 is sent to the first die pressing motor 24 and the second die pressing motor 25 via the second servo amplifier 67,
The first roller pushing device 31 and the second low pushing device 41 are operated with a predetermined pushing amount according to the radius of the rolling gear 7 ′.

Therefore, in the finish rolling apparatus according to this embodiment, the light projecting portion 61 and the light receiving portion 62 function as the phase detecting means according to claim 1 and the radius detecting means according to claim 2, and the computer 65 It functions as the phase determining means according to claim 1 and the pushing amount determining means according to claim 2. Further, as can be understood from FIG. 2, a first injection device 76 for injecting a liquid lubricant is provided so as to face the first roller die 32 that has finished the rolling process, and the second rolling device that has finished the rolling process is installed. A second injection device 77 for injecting a liquid lubricant containing graphite powder is provided so as to face the roller die 42. That is, the first injection device 76 and the second injection device 77 are provided at positions 90 ° apart from the rolling position, respectively, to make the application timing of the lubricant uniform and the application time uniform. The amount of lubricant applied to the roller die 32 and the amount of lubricant applied to the second roller die 42 are made uniform.

(Rolling method according to the embodiment) First, the blank 7 is held in the first blank holding portion 11 in FIG.
Next, the second motor 22 is driven to move the blank 7 to the arrow Y1.
In the same manner, the first motor 21 is driven to rotate the blank 7 in its circumferential direction (arrow E1 direction in FIG. 2) while being conveyed in the direction and placed in the high-frequency heating coil 28. Then, while rotating the blank 7, the outer peripheral portion of the blank 7 is induction-heated by the high-frequency heating coil 28. The region of induction heating to a temperature of 900 ° C. or higher is about 1.3 times the tooth height from the outer peripheral surface of the blank 7. The heating time is about several seconds to 30 seconds.

The blank 7 is in a predetermined temperature range (900 ° or more)
Once heated, the time from the end of heating to the start of rolling is 5
Within seconds This is because the heat transfer to the inside of the blank 7 is suppressed, the temperature rise in the central region of the blank is reduced, and the temperature distribution in the blank 7 is improved. After the heating is completed, the ball screw shaft 24 is operated by the second motor 22 to further convey the blank 7 in the arrow Y1 direction, and the blank 7 is arranged at the processing position R1. At this time, the second blank holding part 12 is moved in the direction of the arrow Y3 to move the second blank holding part 1
The blank 7 is sandwiched and pressure-bonded in the form shown in FIG. 3 by both 2 and the first blank holder 11. The crimping force is secured to one to several tonf by the hydraulic cylinder 29 that presses the second blank holding portion 12.

In this state, the blank 7 is rotated in the circumferential direction by the driving force of the third motor 23. At this time, the drive of the first motor 21 is turned off. Therefore, the blank 7 is the third
It is rotated only by the motor 23. The target rotation speed N _B of the blank 7 is set as follows. That is, the roller die 3
The rotational speed as the N _R of 2,42, roller die 32 and 42
_Is Z _RH, and the number of teeth of the rolling gear formed by the blank 7 is Z _B , N _B = N _R × [Z _B / (Z _B + Z
_RH )].

By the operation of the die rotating motor 5,
The first roller die 32 and the second roller die 42 are synchronously rotated at a constant speed. Then, in response to the push-in synchronization command signal from the control system, the first die pushing motor 24 is operated to move the first roller die 32 in the direction of arrow X1 to push it into the outer peripheral portion of the blank 7, and the second die pushing motor. 25 to operate the second roller die 42 with the arrow X.
The blank 7 is moved in one direction and pushed in synchronously with the outer peripheral portion of the blank 7 (the amount of processing per half rotation of the blank is 0.2 times the module), and the blank is held at the pushing forward end. As a result, swelling and sizing of the teeth occur on the outer peripheral portion of the blank 7, and an appropriate number of teeth are created by hot rolling to form the rolled gear 7 '. After that, the first roller die 32 and the second roller die 42 are moved in synchronization with each other in the direction of the arrow X2 by the separation synchronization command signal from the control system to be separated from the rolling gear 7 '.

After the hot rolling is completed in this manner, the second
The rolling gear 7'is further conveyed in the direction of the arrow Y1 by the motor 22, and the rolling gear 7'is arranged at the finishing position R2.
Then, the light projecting portion 61 is operated to irradiate the tooth portion of the rolling gear 7 ′ with parallel light from the light projecting portion 61, and the tooth profile thereof is received by the light receiving portion 62.
To project. Then, the detection signal detected by the light receiving unit 62 including the image sensor is input to the computer 65 via the sensor controller 64. When the detection signal detected by the light receiving section 62 including an image sensor is input to the computer 65 via the sensor controller 64, the following processing is performed as shown in the flowchart of FIG.

That is, when the detection signal of the light / dark portion edge x _{1 and} the detection signal of the light / dark portion edge x ₂ are sent from the light receiving portion 62 as an image sensor through the sensor controller 64 to the computer 65, the computer 65 The tooth groove center position x _m is calculated by the following equation (1). x _m = (x ₁ + x ₂ ) / 2 (1) Then, from the value of the tooth groove center position x _{m and} the value of the radius r of the reference gear, the following formula (2) The phase shift Δθ is calculated.

Δθ = (x _m / r) × 360 / 2π [deg] (2) Then, it is confirmed that the tooth groove center position x _m is in the bright portion. When the tooth groove center position x _m is in the dark portion, the blank rotation motor 23 is rotated by CW (clockwise approximately) by one pitch of the tooth profile so that the tooth groove center position x _m is located in the light portion. To do. Then, in order to match the phase of the rolling gear 7 ′ with the phases of the first finishing roller die 33 and the second finishing roller die 43, the die rotation motor 5 is moved from the reference position by Δθ × (gear tooth number / die tooth number). ) The output signal for rotating is supplied to the die rotating motor 5 via the first servo amplifier 66.
Send to

The first finishing roller die 33 and the second finishing roller die 33
The reference position of the finishing roller die 43 is stored in advance as a die tooth position encoder 430 that meshes with the center of the tooth groove of the reference gear at the center of the light receiving portion.
In addition, from the detection signal of the bright / dark portion edge x _{1 and} the detection signal of the bright / dark portion edge x ₂ , x ₁ and x
The distance L between the _two is calculated.

[0039] _{L = | x 1 -x 2 |} ... (3) Then, the value of the distance L between x ₁ and x _2, x ₁ and x ₂
From the value of the distance L ₀ in the reference gear between and the value of the pressure angle α of the reference gear, the difference Δr between the radius of the rolling gear 7 ′ and the radius of the reference gear is calculated by the following (4). Δr = {(L ₀ −L) / 2} / tan α (4) Then, the pressing amount of the first finishing roller 33 and the second finishing roller 43 into the rolling gear 7 ′ is set to the radius of the rolling gear 7 ′. In order to obtain a predetermined pushing amount according to the output signal, an output signal corresponding to the difference Δr between the radius of the rolling gear 7 ′ and the radius of the reference gear is output via the second servo amplifier 67 to the first die pushing motor 24 and the first die pushing motor 24. It is sent to the motor 25 for pushing in two dies.

In this state, in response to the push-in synchronization command signal from the control system, the first finishing roller die 33, which rotates in a predetermined phase according to the output signal from the computer 65, is moved in the direction of arrow X1 to form the blank 7. Along with pushing, the second finishing roller die 43, which also rotates in a prescribed phase, is moved in the direction of arrow X1 and synchronized with the blank 7, and is pushed in with a prescribed amount of depression according to the output signal from the computer 65. As a result, the tooth portion of the blank 7 is in a warm region (starting rolling temperature 700 to finishing temperature 400 °).
Finished and rolled in C). After that, the first finishing roller die 33 and the second finishing roller die 43 are moved in the direction of the arrow X2 to be separated from the blank 7.

As described above, in this embodiment, the phases of the first finishing roller die 33 and the second finishing roller die 43 are aligned with the phases of the rolling gear 7 ′ arranged at the finishing rolling position 2. Since the first finishing roller die 33 and the second finishing roller die can be pushed into the rolling gear 7'at the same time, the first finishing roller die 33 and the second finishing roller die 43 move back and forth to contact the rolling gear 7 '. It is possible to prevent the occurrence of temperature unevenness due to this, and the occurrence of dents due to the first finishing roller die 33 and the second finishing roller die 43 coming into contact with the rolling gear 7 ′ in a phase-shifted state. .

Further, since the pushing amounts of the first finishing roller die 33 and the second finishing roller die 43 are determined according to the radius of the rolling gear 7'to be finished rolling, each rolling to be finished rolling is performed. The pushing amount of the first finishing roller die 33 and the second finishing roller die 43 can be finely adjusted according to the radius of the gear 7 '. Therefore, there is no excess or deficiency in pushing the first finishing roller die 33 and the second finishing roller die 43 due to a dimensional error during hot rolling.

Further, as shown in FIG. 1, a ball screw system using precision ball screw shafts 37 and 47 is adopted, and the ball screw shafts are driven by the first and second die pressing motors 24 and 25 which are servomotors. Since a servo control system for synchronously controlling 37 and 47 is adopted, the accuracy of feeding the first finishing roller die 33 and the second finishing roller die 43 in the pushing direction can be increased, and the pushing amount can be adjusted with high accuracy. It is possible.

Therefore, according to this embodiment, the rolling gear 7'can be finish-rolled with high accuracy, and the hot-rolled gear with high accuracy can be manufactured. The present invention has been made on the assumption that the rolling gear 7'after hot rolling is finish rolled in a warm state, and therefore means for detecting the phase and radius of the rolling gear 7 '. However, it is of course possible to employ contact-type detection means such as a positioning pin in the case of cold finish rolling. When finishing rolling in a warm state after hot rolling, if contact type detecting means such as a positioning pin is used,
This is because there is a problem that temperature unevenness or the like occurs due to the contact of the positioning pin or the like with the rolling gear 7 ', but such a problem does not occur when finish rolling is performed in the cold.

[0045]

Example 1 A blank 7 made of S58C material was hot-rolled and warm-finished in accordance with the method described in the above embodiment, and the outer diameter was 190 mm, the inner diameter was 108 mm, and the module was 2. Four gears were manufactured. The hot rolling conditions are: die rotation 300 rpm, die roller pushing speed 6 mm / s.
ec, sizing time 4 sec, processing start temperature 900
C. and the processing end temperature was 620.degree. The warm finishing conditions were the same: die rotation 300 rpm, tooth surface reduction 30 μm, processing start temperature 600 ° C., processing end temperature 500 ° C., rolling time 5 sec.

With respect to the obtained gear, the runout of the tooth space and the pressure angle error were examined. The runout of the tooth groove means the displacement in the radial direction when a contact piece such as a bearing ball is brought into contact with the tooth surface forming the tooth groove in the vicinity of the pitch circle based on the JIS standard. The pressure angle error is 171.
The amount of displacement from an involute curve having a basic circle diameter of 173 mm was interpolated by a regression line, and the amount of separation from the involute curve of the tooth tip portion and the tooth root portion was defined to define the displacement.

FIG. 7 shows the relationship between the gear machining allowance (the amount of OBD change) and the tooth groove runout, and FIG. 8 shows the relationship between the gear machining allowance and the pressure angle error. For comparison, except that during finishing rolling, the phase of the finishing die roller was not adjusted to the phase of the rolling gear, and the pushing amount of the finishing die roller was not finely adjusted according to the radius of the rolling gear. In the same manner, the gear of the comparative example manufactured in the same manner as the above example was evaluated.

As is clear from FIGS. 7 and 8, the gear according to the present embodiment has remarkably improved accuracy in both the runout of the tooth space and the pressure angle as compared with the gear of the comparative example. (Embodiment 2) A gear having the same specifications as in Embodiment 1 is hot-rolled, taken out, cooled, and then attached to the first blank holding portion 11 again, and the high-frequency heating coil 28 is used.
After heating the tooth portion to 0 ° C. for 10 seconds, the tooth portion was moved to the finish rolling position R2. Then, according to the method described in the above embodiment, the warm finish rolling was performed by adjusting the phase and the pushing amount of the finishing die roller.

When the obtained gear was examined for tooth groove runout and pressure angle error in the same manner as in Example 1, the same results as in FIGS. 7 and 8 were obtained. (Example 3) A gear having the same specifications as in Example 1 was manufactured by bob cutting, and then finish rolling was carried out in the same manner as in Example 2.

When the resulting gear was examined for tooth groove runout and pressure angle error as in Example 1, the same results as in FIGS. 7 and 8 were obtained.

[0051]

As described in detail above, in the finish rolling device according to the first aspect, both finish roller dies are simultaneously rolled in a state in which the phase of the pair of finish roller dies is matched with the phase of the rolling gear. Since it can be pushed into the forming gear, both roller dies move back and forth to contact the rolling gear, resulting in temperature unevenness and dents caused by contacting the rolling gear with both roller dies out of phase. It is possible to prevent the occurrence. Therefore, the rolling gear can be finish-rolled with high accuracy.

In the finish rolling apparatus according to the second aspect,
Since the pushing amount of the pair of finishing roller dies can be finely adjusted according to the radial length of each rolling gear to be finished rolling, it is possible to press the finishing roller die due to dimensional error during hot rolling. There is no excess or deficiency. Therefore, the rolling gear can be finish-rolled with high accuracy. Furthermore, since the finish rolling apparatus according to claim 1 and claim 2 uses the non-contact type detecting means, it is also good when the finish rolling of the rolling gear after hot rolling is warm. Can be applied to.

[Brief description of drawings]

FIG. 1 is a plan view schematically showing the entire apparatus.

FIG. 2 is a front view of a main part of the device.

FIG. 3 is a cross-sectional view showing an internal structure of a blank holder.

FIG. 4 is a block diagram illustrating a means for determining a phase and a pushing amount of a finishing roller die.

FIG. 5 is an explanatory diagram showing a projected state of a tooth profile on a light receiving unit.

FIG. 6 is a flowchart illustrating a method of determining a phase and a pushing amount of a finishing roller die.

FIG. 7 is a diagram showing a relationship between a gear machining allowance and a runout of a tooth groove.

FIG. 8 is a diagram showing a relationship between a gear machining allowance and a pressure angle error.

[Explanation of symbols]

In the figure, 1 is a blank holding part, 11 is a first blank holding part, 11a is a first holding shaft, 12 is a first blank holding part,
12a is a first holding shaft, 3 is a roller pushing device, 31 is a first
Roller pushing device, 33 is a first finishing roller die, 36 is a first housing, 41 is a second roller pushing device, 43 is a second finishing roller die, 46 is a second housing, 7 is a blank, and 7'is a rolling gear. 5 is a motor for rotating the die, 24
Is a first die pushing motor, 25 is a second die pushing motor, 61 is a light emitting section, 62 is a light receiving section, 64 is a sensor controller, 65 is a computer, 66 is a first servo amplifier, and 67 is a second servo amplifier. Is.

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor, Junji Funatsu, Toyota City, Toyota City, Aichi Prefecture, 1st Toyota Motor Co., Ltd. (72) Inventor, Noritaka Miyamoto, Toyota City, Aichi Prefecture, Toyota City, Ltd. 72) Inventor Toshiaki Tanaka 1 of 41, Nagachote, Nagakute-cho, Aichi-gun, Aichi Prefecture Toyota Central Research Institute Co., Ltd. Toyota Central Research Institute, Inc. (72) Inventor Yoshihiro Kitamura 1-1-1 Fujikoshi Honcho, Toyama City, Toyama Prefecture Fujikoshinai Co., Ltd.

Claims (2)

[Claims] Claim: What is claimed is: 1. A pair of finishing roller dies, which are arranged so as to sandwich a hot-rolled rolling gear, sandwich the rolling gear by rotating the rolling gear synchronously with the pair of finishing roller dies. A device for finish rolling, comprising a phase detection means for detecting the phase of the rolling gear in a non-contact manner according to the outer shape of the rolling gear, and the pair of finishes according to a detection signal of the phase detection means. A finish rolling device for a hot rolling gear, comprising: phase determining means for determining the phase of the roller die so as to match the phase of the rolling gear. 2. A rolling gear is formed by pressing a pair of finishing roller dies, which are arranged so as to sandwich a hot-rolled rolling gear, while rotating the rolling gear synchronously. A device for finish rolling, which is a non-contact radius detection means for detecting the radial length of the rolling gear according to the outer shape of the rolling gear, and a detection signal of the radius detection means. A finishing rolling device for a hot-rolled gear, comprising: a pushing amount determining means for determining a pushing amount of the pair of finishing roller dies.