JPH07197131A - Non-oxidation induction hardening method for worm and device therefor - Google Patents

Abstract

PURPOSE:To complete the hardening of a worm in a short time without forming scale on the surface of the worm, to form the hardened layer even on tooth edge and to more reduce strain. CONSTITUTION:This device is provided with a pre-atmospheric chamber 10 filled with non-oxidizing gas G a cooling liquid tank 100 into which the lower part of a non-oxidizing chamber 20 for executing the heating is dipped, walking beams 91, 92 for carrying the worm W from the atmosphere to the non-oxidizing chamber 20 through the pre-atmospheric chamber 10, a work supported rotating device for rotating the worm W while supporting both ends of the worm W placed on a straightening roller 40 in the non-oxidizing chamber 20, a lime coil 30 for heating the worm W, a work elevating device 50 for descending the work into cooling liquid L1 after heating, a jacket 101 provided in the cooling liquid L1 and injecting the cooling liquid L1 to the worm W, a work elevating drive 60 for carrying the cooled worm W to the outside of the cooling liquid tank 100, and the like.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for forming a hardened layer in an atmosphere gas of a worm by induction hardening, especially induction bright quenching, or non-oxidation induction hardening of a worm, and an apparatus for applying the method. Regarding the device.

[0002]

2. Description of the Related Art Conventionally, surface hardening of a worm by induction hardening will be described with reference to FIG. Induction hardening of the worm is a work rotation mechanism (not shown) that rotates the worm W around its longitudinal axis.
And an I-shaped root-rotating soaking high-frequency heating coil 800 inserted between the teeth of the worm W, and the I-shaped bottom-rotating soaking high-frequency heating coil 800 is moved in accordance with the rotation of the worm W and the inter-tooth space WB. Is performed by an induction hardening apparatus having a pair of guides 810 and a jacket (not shown) for injecting the cooling liquid into the worm W.

That is, in such an induction hardening apparatus, the I-shaped bottom rotating profile heating high-frequency heating coil 800 is inserted in the inter-tooth space WB of the worm W, and the I-type root rotating profile heating high-frequency heating coil 800 is inserted. The guide 810 is inserted into the interdental WB on both sides adjacent to the interdental WB. When the worm W is rotated, the I-shaped bottom-rotating soaking high-frequency heating coil 800 automatically moves between the teeth by the guide 810, and the peripheral surface of the worm W can be heated over the entire surface.

[0004]

However, the above-described conventional induction hardening of a worm has the following problems. That is, since a black scale is formed on the surface of the hardened layer of the worm after quenching, polishing work or the like on the surface for scale removal is required.

Further, since an I-shaped root rotating profile heating high frequency heating coil is inserted between the teeth of the worm and heated one by one while rotating the worm, the heating time tends to be long.

Further, the hardened layer WA (dotted in the drawing) obtained by such a method is formed only on the tooth bottom WC and the tooth face WF as shown in FIG. It is not formed in WT.

In addition, the worm causes strain when heated, but no consideration is given to the strain, and after the quenching is completed, it is corrected by an additional strain correcting device. It is a reality.

The present invention was devised in view of the above circumstances. When induction hardening is performed on a worm, no scale is formed on the surface of the worm, and the hardening of the worm is completed in a short time. Further, it is an object of the present invention to provide a worm non-oxidation induction hardening method and apparatus in which a hardened layer is formed and the strain can be further reduced.

[0009]

A non-oxidizing induction hardening method for a worm according to the present invention comprises a step of introducing a worm constituting a worm gear into a preliminary atmosphere chamber filled with a non-oxidizing or reducing gas, and the worm. After heating the worm into the non-oxidizing chamber filled with the gas, the worm is subjected to high-frequency heating, and the heated worm is immersed in a cooling liquid to be cooled, and then transferred to the outside of the cooling liquid. Further, the above-mentioned steps are continuously and automatically performed.

A non-oxidizing induction hardening apparatus for a worm according to the present invention is connected to a preliminary atmosphere chamber filled with a non-oxidizing or reducing gas, and is connected to the preliminary atmosphere chamber, and is filled with the gas to warm the worm. A non-oxidizing chamber in which high frequency heating is performed, a cooling liquid tank in which a cooling liquid in which the lower parts of both chambers are immersed are stored, a means for carrying the worm from the atmosphere into the non-oxidizing chamber through a preliminary atmosphere chamber, A straightening roller for mounting the worm carried into the oxidation chamber, a work supporting and rotating device for rotating the worm while supporting both ends of the worm mounted on the straightening roller, and a worm supported by the work supporting and rotating device. And a line coil for heating the worm, which is placed on the straightening roller and whose both ends are supported by the work supporting and rotating device, is raised to the heating position together with the straightening roller and the work supporting and rotating device. Work elevating device that descends into the cooling liquid after heating, a jacket that is provided in the cooling liquid and that sprays the cooling liquid to the worm to cool the worm, and a means that transfers the cooled worm to the outside of the cooling liquid tank. And have.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a schematic configuration diagram of an embodiment of an apparatus capable of realizing a non-oxidation induction hardening method for worms according to the present invention,
2 is a side view of the straightening roller, FIG. 3 is a front view of the work supporting / rotating device and the straightening roller, FIG. 4 is a side view of the straightening roller and the work pushing device, FIG. 5 is an operation explanatory view of the walking beam, and FIG. FIG. 7 is a perspective view of a line coil used in this non-oxidation induction hardening apparatus for worms, and FIG. 7 is a sectional view of the worm showing a hardened layer obtained by this non-oxidation induction hardening apparatus for worms.

The non-oxidizing induction hardening apparatus for a worm according to the present embodiment has a lower open preliminary atmosphere chamber 10 having a shutter S _{1 at} one end and a shutter S _{2 at} the other end, and a shutter S _2. A non-oxidizing chamber 20 that is also open to the bottom and is connected to the preliminary atmosphere chamber 10 and these preliminary atmosphere chambers 10
And a cooling liquid tank 10 provided below the non-oxidizing chamber 20.
It has 0 and.

In the cooling liquid tank 100, the cooling liquid L
₁ is stored, and the lower portions of the preliminary atmosphere chamber 10 and the non-oxidizing chamber 20 are immersed in the cooling liquid L ₁ .

Further, as a means for carrying in the worm W, which is a work, the worm W is placed and placed in the atmosphere and the preliminary atmosphere chamber 1.
A walking beam 91 that moves between 0 and 0, and a worm W are also placed on the preliminary atmosphere chamber 10 and the non-oxidizing chamber 20.
And a walking beam 92 that moves between and.

Furthermore, the non-oxidation induction hardening apparatus for a worm of the present embodiment is the worm W carried into the non-oxidation chamber 20.
The correction roller 40 as a means for rotatably holding the worm W while correcting the distortion of the worm W, the work supporting and rotating device 32 for rotating while supporting both end surfaces of the worm W, and the correction roller 40 mounted on the correction roller 40. A line coil 30 for heating the worm W and a work elevating device for raising the worm W mounted on the straightening roller 40 and supported by the work supporting and rotating device 32 to a heating position and lowering it into the cooling liquid L ₁ after heating. 50, a work extruding device 56 that extrudes the worm W, which has been cooled in the cooling liquid L ₁ , from the straightening rollers 41 and 44 onto the guide plate 58 to move the worm W to the work lifting device 60, and the worm W as the cooling liquid. the workpiece increases device 60 for pushing up into the atmosphere from L within _1, a work unloading device 70 for unloading the worm W going out into the atmosphere and into the quenching apparatus outside the preliminary And 囲気 chamber 10 and a gas supply means 80 for supplying an atmospheric gas G to the non-oxidizing chamber 20.

The gas supply means 80 supplies a non-oxidizing atmosphere gas G such as nitrogen or argon or a non-oxidizing atmosphere such as hydrogen. In the preliminary atmosphere chamber 10, a gas supply hole 83 for receiving the atmosphere gas G from the gas supply means 80 is provided in the lower portion, and a gas discharge hole 84 for discharging the atmosphere gas G is provided in the ceiling portion. Further, the non-oxidizing chamber 20 is also provided with a gas supply hole 81 in the lower part and a gas discharge hole 82 in the top part.

As shown in FIG. 1, the non-oxidizing chamber 20 is formed in a substantially cylindrical shape. A line coil 30 is installed near the top of the non-oxidizing chamber 20 via a skirt 31 attached to the side wall 21.

As shown in FIG. 6, the line coil 30 includes a first arc conductor 30A having a substantially 1/4 arc shape and a first straight line connected to the end of the first arc conductor 30A so as to be orthogonal thereto. -Shaped conductor 30B, and a semi-circular arc-shaped conductor 30C having a substantially semi-circular arc connected to an end of the first linear conductor 30B,
A second straight conductor 30D connected to the end of the semi-circular conductor 30C and a second arc-shaped conductor 30E having a substantially quarter arc shape connected to the end of the second straight conductor 30D. Have

The first arc-shaped conductor 30A and the second arc-shaped conductor 3
0E is provided so as to face the semi-circular conductor 30C. On the other hand, the first linear conductor 30B and the second linear conductor 30D are installed so as to be parallel to the longitudinal axis of the worm W.

As shown in FIG. 2, the straightening roller 40 includes a pair of rollers 41 and 41 mounted on a shaft 42 supported by a bearing 43, and a roller 44 mounted on a shaft 45 supported by a bearing 46. A roller mount 47 to which the bearings 43 and 46 are fixed, and a roller rotation motor 48 (see FIG. 3) provided on the roller mount 47 are provided. In addition,
Although the pair of straightening rollers 40 is provided in this embodiment, it is possible to provide more straightening rollers according to the length dimension of the worm W and the like.

As shown in FIG. 3, the work supporting / rotating device 32 is provided with a worm end supporting device 33 for supporting one end of the worm W and a chuck 35 for gripping the other end so as to face each other. There is. The worm end support device 33 and the chuck 35 have a worm end support device moving cylinder 34 for moving the worm end support 33 and the chuck 35 in the longitudinal direction of the worm W, respectively.
Also, a chuck moving cylinder 36 is provided. FIG. 37 shows a chuck rotating motor.

The worm end support device moving cylinder 34 and the chuck moving cylinder 36 are mounted on the roller mounting base 47 of the straightening roller 40. The chuck rotating motor 37 and the roller rotating motor 48 are both waterproof, and are supplied with power from a power box (not shown) provided in the non-oxidizing chamber 20 by a cabtire cord (not shown). Motor 37 and roller rotation motor 48 are used for cooling liquid L.
_It can operate normally even if it is immersed in ₁ .

The work elevating device 50 includes a cooling liquid tank 10.
A cylinder 52 attached to the bottom portion 102 of 0 and a rod 51 that advances and retracts by the cylinder 52 are provided, and the roller attachment base 47 of the correction roller 40 is fixed to the tip of the rod 51.

The work extruding device 56 as a means for extruding the worm W from above the straightening roller 40 is mounted on the support column 53 standing on the bottom 102 of the cooling liquid tank 100 and on the top of the support column 53 substantially horizontally. Cylinder 54
The cylinder 54 moves forward and backward, and when it advances, the worm W placed on the straightening rollers 41 and 44
And a rod 55 that pushes the worm W out of the straightening roller 40 and onto the guide plate 58.

The work lifting device 60 supports the work supporting member 6 for supporting the worm W, which has fallen from the straightening roller 40 via the guide plate 58, with the wall of the cooling liquid tank 100.
3, a rod 61 attached to the lower portion of the work supporting member 63, and a cylinder 62 for advancing and retracting the rod 61.

The work unloading device 70 is an inclined plate member arranged in the vicinity of the cooling liquid tank 100 so that the worm W placed on the work unloading device 70 can be rolled and carried out.

The cooling liquid L ₁ stored in the cooling liquid tank 100 is high speed quench oil or bright oil, and in this cooling liquid L ₁ , the worm immersed in the cooling liquid L ₁ is used. A pair of jackets 101, 101 for injecting the cooling liquid L ₁ to W to rapidly cool it is provided.

The walking beams 91 and 92 are repeatedly moved in four steps in the directions of arrows A, B, C and D as shown in FIG. Then, after completing the four-step movement, the worm W moves toward the walking beams 91 and 92.
Move forward one groove in a fixed beam (not shown) located on the side of the. In the following, the movement of the worm W to the next groove is referred to as "the worm W has advanced one step".

The first worm W is first placed in a groove corresponding to the groove 93 at the right end (right end in the drawing) of the walking beam 91 in the first groove of the fixed beam (not shown). The worm W advances by one step by the walking beams 91 and 92 repeating the four-step movements.

[0030] When the worm W is advanced first one step, in the second warm-W _{2 (2} second warm-W ₂
Is attached. Hereinafter, the third, fourth, ... Worms are similarly labeled with W ₃ , W ₄ ,. ) Is placed in the groove in which the worm W is placed at the beginning of the fixed beam. Hereinafter, the worms W ₃ , W ₄ , ... Are sequentially placed.

By the operation of the walking beams 91 and 92, the worm W is carried into the non-oxidizing chamber 20 through the preliminary atmosphere chamber 10. However, walking beam 91 and the 92, while with the movement of the process of the arrows B, C and D are open the shutter S ₁ and the shutter S _2, are closed at other times.

Non-oxidizing chamber 20 with walking beam 92
At this time, the worm W carried in is placed on the straightening roller 40 raised by the work elevating device 50, and at the same time, the worm end supporting device moving cylinder 34 of the work supporting and rotating device 32 and Both ends of the worm W are supported between the worm end supporting device 33 and the chuck 35 by the operation of the chuck moving cylinder 36.

Next, the cylinder 5 of the work lifting device 50.
2 is operated to raise the roller mount 47 and position the worm W between the line coils 30, which are high-frequency heating coils, and then the chuck rotation motor 37 and the roller rotation motor 48 are started to operate. Rotate the worm W. Then, the high-frequency current from the high-frequency power source 200 is passed through the line coil 30 to heat the worm W for a predetermined time. The heating of the worm W by the line coil 30 is
Since it is performed over the entire peripheral surface of the worm W, the heating can be completed in an extremely short time as compared with the conventional I-shaped root rotating profile grilling high frequency heating coil.

When this heating is completed, the cylinder 52 is operated to retract the rod 51, and the rotating worm W, together with the straightening roller 40 and the work supporting / rotating device 32, is cooled by the cooling liquid L _{1 in the} cooling liquid tank 100. While being submerged in the inside, the worm W is rapidly cooled by injecting the coolant L ₁ from the pair of jackets 101, 101 provided in the coolant tank 100 to the worm W while continuously rotating the worm W.

When the cooling of the worm W is completed, the chuck rotating motor 37 and the roller rotating motor 48 are stopped, and the cylinder 54 of the work extruding device 56 is operated to move the rod 55 forward.
1, 44 are pushed out, transferred on the guide plate 58, and reach the work supporting member 63.
It hits the side wall of 0 and stops.

Then, when the cylinder 62 is operated to raise the rod 61, the worm W is cooled by the worm W.
As soon as it rises along the side wall of the cooling liquid L ₁ and exits the liquid surface of the cooling liquid L ₁ and exceeds the side wall of the cooling liquid tank 100, the work unloading device 7
It rolls over 0 and is conveyed to a predetermined place by the work unloading device 70.

As described above, according to this embodiment, the worm W is extremely effectively non-oxidized and induction-fired. The worms W ₂ , W ₃ , ... Following the worm W are similarly quenched.

When the worm W is hardened by the above-described non-oxidation induction hardening device for worms, as shown in FIG. 7, not only the interdental WC and the face WF of the tooth, but also the tip W of the tooth.
The hardened layer WA is also formed on T.

[0039]

The non-oxidizing induction hardening method for a worm according to the present invention comprises a step of bringing the worm forming the worm gear into a preliminary atmosphere chamber filled with a non-oxidizing or reducing gas, and The method has a step of heating the worm by high-frequency heating after being carried into a filled non-oxidizing chamber, a step of immersing the heated worm in a cooling liquid to cool it, and then transferring it to the outside of the cooling liquid, and The process is designed to be continuous and automatic. Therefore, when the worm is induction hardened, it can be hardened without forming a scale on the surface of the worm.

The non-oxidizing induction hardening apparatus for a worm is connected to a preliminary atmosphere chamber filled with a non-oxidizing or reducing gas, and is connected to the preliminary atmosphere chamber, and is filled with the gas to perform high-frequency heating of the worm. A non-oxidizing chamber in which the above-mentioned two chambers are immersed, a cooling liquid tank in which the cooling liquid in which the lower parts of both chambers are immersed is stored, a means for carrying the worm from the atmosphere into the non-oxidizing chamber through the preliminary atmosphere chamber, and the non-oxidizing chamber A straightening roller for mounting the worm loaded onto the straightening roller, a work supporting and rotating device for rotating the worm while supporting both ends of the worm mounted on the straightening roller, and heating the worm supported by the work supporting and rotating device. The line coil and the worm placed on the straightening roller and supported at both ends by the work supporting and rotating device are raised to the heating position together with the straightening roller and the work supporting and rotating device, and are applied. After that, a work elevating device that descends into the cooling liquid, a jacket that is provided in the cooling liquid and that sprays the cooling liquid to the worm to cool the worm, and a means that transfers the cooled worm to the outside of the cooling liquid tank are provided. Have Therefore, quenching can be performed without forming a scale on the surface of the worm, quenching of the worm is completed in a short time, a hardened layer is formed on the tooth tips, and distortion can be further reduced. it can.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of an embodiment of an apparatus capable of realizing a non-oxidation induction hardening method for a worm according to the present invention.

FIG. 2 is a side view of a straightening roller.

FIG. 3 is a front view of a work supporting and rotating device and a straightening roller.

FIG. 4 is a side view of a straightening roller and a work extruding device.

FIG. 5 is an operation explanatory diagram of a walking beam.

FIG. 6 is a perspective view of a line coil used in this worm non-oxidation induction hardening apparatus.

FIG. 7 is a cross-sectional view of a worm showing a hardened layer obtained by the non-oxidation induction hardening apparatus for the worm.

FIG. 8 is a sectional view of a worm showing a conventional induction hardening method for a worm and its problems.

[Explanation of symbols]

 10 preliminary atmosphere chamber 20 non-oxidizing chamber 30 line coil 40 straightening roller 50 work lifting device 60 work lifting device 70 work unloading device W worm

Claims (2)

[Claims] 1. A step of loading a worm forming a worm gear into a preliminary atmosphere chamber filled with a non-oxidizing or reducing gas, and a high-frequency heating of the worm after loading the worm into a non-oxidizing chamber filled with the gas. And a step of immersing the heated worm in a cooling liquid to cool it, and then transferring it to the outside of the cooling liquid, and each of the steps is continuously and automatically performed. Non-oxidation induction hardening method. 2. A preliminary atmosphere chamber filled with a non-oxidizing or reducing gas, a non-oxidizing chamber connected to the preliminary atmosphere chamber and filled with the gas for high-frequency heating of a worm, and Cooling liquid tank in which the lower part of the chamber is immersed, a means for bringing the worm from the atmosphere into the non-oxidizing chamber through the preliminary atmosphere chamber, and a correction for mounting the worm carried in the non-oxidizing chamber A roller, a work supporting / rotating device that rotates the worm while supporting both ends of the worm mounted on the correction roller, a line coil that heats the worm supported by the work supporting / rotating device, and a line coil mounted on the correction roller. A work elevating device that raises the worm, which is placed on the work supporting and rotating device at both ends, up to the heating position together with the straightening roller and the work supporting and rotating device, and drops into the cooling liquid after heating. , A non-oxidizing high frequency of a worm, characterized by comprising: a jacket provided in the cooling liquid for cooling the worm by injecting the cooling liquid into the worm; and a means for transferring the cooled worm to the outside of the cooling liquid tank. Quenching equipment.