JP3095103B2 - Induction hardening apparatus and method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a chlorash having a plurality of hardened portions having different shapes and hardening conditions.
TECHNICAL FIELD The present invention relates to an induction hardening apparatus and an induction hardening method suitable for quenching (hereinafter, referred to as a shoe).

[0002]

2. Description of the Related Art FIG.
5 (A) is a plan view showing a part of a crawler used for a lower traveling body such as a hydraulic excavator, and FIG. 5 (B) is a side view showing a plurality of cast iron-made shoes 50. It is connected by two connecting pins 60 each at the front and rear. The shoe
Reference numeral 50 denotes a claw portion 51 which meshes with a drive hole and a driven wheel of the crawler, and right and left tread surfaces 5 which are located on both sides of the claw portion 51 and on which a roller attached to the traveling frame rolls.
2, 52 and the connecting pin 60 are inserted, and the claw 5
Induction hardening is performed on the pin boss 54 provided in a direction perpendicular to the projecting direction of the pin 1 in order to improve wear resistance of these portions. The induction hardening is
This is performed by bringing the inductor of the quenching device close to the quenching portion, energizing the inductor to generate eddy current in the quenching portion to generate heat, thereby raising the temperature, and quenching the quenching water to quench.

Generally, the inductor is manufactured according to the shape of the part to be quenched, and the conditions for energizing the inductor are set according to the quenching conditions for the part to be quenched. In the case where quenching is performed on a plurality of portions having different shapes and quenching conditions as in -50, a dedicated induction hardening device including an inductor and an inductor power transformer adapted to the quenched portion is provided for each of the portions. Required, and a total of three induction hardening devices are required. In addition, a wide space is required for installing these hardening devices.
However, there is a problem in that the Also, for each quenching process of each part, a table for positioning the shoe 50 (this table is attached to each quenching device, and it is a dedicated table that can fix the shoe 50 so that the quenched portion faces the inductor. If it is necessary to assemble to the table or remove it from the table, and if each quenching device is installed in a remote place, There is a problem in that it takes time to set up the operation such as moving between them, and the work efficiency is poor. Further, in the conventional induction hardening apparatus, since the operating direction of the inductor only approaches the quenching part in the vertical direction or separates from the quenching part, an operator manually adjusts the gap between the inductor and the quenching part by manual operation. The child was moved and the cooling water was blown out by a worker using a hand-held hose, which also reduced the work efficiency.

SUMMARY OF THE INVENTION In view of the above-mentioned circumstances, an object of the present invention is to provide a compact induction hardening apparatus and a compact induction hardening apparatus which can shorten the setup time and improve the work efficiency and can be installed in a narrow space. And

[0005]

SUMMARY OF THE INVENTION Induction hardening equipment of the present invention
In order to achieve the above purpose, the crawler shoe should be on one side
And a tread surface formed on both sides of the claw portion
And provided in a direction perpendicular to the projecting direction of the claw portion.
Height of the pin boss for inserting the connecting pin between crawler shoes
An apparatus for performing frequency hardening , comprising: a claw inductor surrounding the claw; a claw inductor surrounding the claw, and a tread surface provided on a head of a final stage movable body of a three-dimensional positioning device including X, Y, and Z axis movable bodies. Meeting
And a pin to be inserted into the pin boss.
A table for mounting a crawler shoe in the vicinity of the three-dimensional positioning device ; Te - comprising a device for pivoting the table, the positioner comprising a device for raising and lowering, the tread surface and
The claw part is a table with the crawler shoe mounted thereon.
Harden in a flat posture, and the pin boss is
Quenching the table in a vertical position with the device upright
Characterized by having a configuration for performing In addition, the present invention
The induction hardening device is provided on the head of the final stage movable body.
A transformer box containing a transformer is provided.
On the front of the box, for the crawl claw, tread surface
And a structure to attach each inductor for the pin boss
Characterized in that was.

Further, an induction hardening method according to the present invention is a hardening method using the above-described induction hardening apparatus, wherein the shoe is fixed to a table of the positioner in a state where the shoe is mounted on a machining pallet. It is characterized by.

[0007]

Since the induction hardening apparatus of the present invention has the above-described configuration, the position of the inductor attached to the transformer box or the like provided on the final stage movable body is set to an arbitrary position by the operation of the three-dimensional positioning apparatus. In addition, the table with the shoe fixed
When the bull is driven, the shoe rotates and undulates. Thereby, the relative position between the inductor and the shoe is arbitrarily set. Further, when a transformer box having a built-in transformer is provided in the final stage movable body and the inductor is provided in the transformer box, the distance between the transformer and the inductor becomes short.

Further, in the induction hardening method of the present invention, since the machining pallet having the shoe attached thereto is fixed to the table of the positioner, the position of the shoe is set by setting the position of the pallet. Is done.

[0009]

1 is a front view showing an embodiment of an induction hardening apparatus according to the present invention, FIG. 2 is a side view, and FIG. 3 is a plan view. As shown in FIGS. 1 to 3, the induction hardening apparatus of the present embodiment includes a main body 1 composed of a three-dimensional positioning device for setting the position of the inductor and a positioner 2 for setting the position of the shroud 50. First, the main body 1 will be described.

Reference numeral 3 denotes a base frame installed horizontally on the base surface. This base frame has a structure in which both ends of a pair of parallel frames 3a are integrally joined by an installation frame 3b. Rails 3d are provided on the upper surfaces of the pair of frames 3a, respectively.
A rack 3c is provided on the upper surface of one of the frames 3a along the longitudinal direction of the frame 3a.

Reference numeral 4 denotes an X-axis frame as an X-axis movable body which is moved along the frame 3a. The X-axis frame is formed by connecting both ends of a pair of parallel frames 4a together by an installation frame 4b. A known linear bearing 4d is attached to the lower surface of the frame 4a.
Is movably assembled to the rail 3d of the base frame 3. Further, an X-axis motor 12 and a worm speed reducer 13 are provided on the X-axis frame 4, and the worm speed reducer 13 is provided.
The output pinion 14 is connected to the rack 3 of the base frame 3.
c. Therefore, the X-axis motor 12 is operated based on a command value from a numerical controller (not shown) (not shown) to drive and control the pinion 14 so that the X-axis frame 4 can be moved. Base frame 3
And the position of the X-axis frame 4 can be set.

Reference numeral 5 denotes a Y-axis frame erected on the X-axis frame 4. The Y-axis frame 5 has a portal shape in which the upper ends of a pair of parallel vertical frames 5a are joined by an installation frame 5b. What to do. Reference numeral 6 denotes a Y-axis table as a Y-axis movable body which is mounted so as to be vertically movable along the Y-axis frame 5. The Y-axis table 6 is a Y-axis balance cylinder 18 which is pushed up at a constant pressure.
Linear bearing 6d provided on the side
6d is provided on the side of the frame 5a.
It is movably assembled to d. A Y-axis motor 15 and a worm reducer 16 are provided on one vertical frame 5a of the Y-axis frame 5, and an output pinion 17 of the worm reducer 16 is connected to a Y-axis frame. It engages with the rack 6c on the side of the bull 6. Therefore, similarly to the above, the Y-axis table 6 is moved to the rail 5 based on a command value from an NC device (not shown).
By moving up and down along d, the position of the Y-axis table 6 can be set.

Reference numeral 7 denotes a Z-axis movable body mounted on the Y-axis table 6 so as to be able to move forward and backward with respect to the positioner 2.
The Z-axis frame 7 has a rail 7d provided on the lower surface thereof movably assembled with a linear bearing 6e provided on the upper surface of the Y-axis table 6. A Z-axis motor 19 and a worm speed reducer 20 are provided on the upper surface of the Y-axis table 6, and an output pinion 21 of the worm speed reducer 20 is provided on a side surface of the Z-axis frame 7. Rack 7c provided
Is engaged. Accordingly, the Z-axis frame 7 can be set at an arbitrary position on the Y-axis table 6 in the same manner as described above based on a command value from an NC device (not shown).

The Z-axis frame 7 is provided with a water pipe for supplying quenching water, a water pipe 70 for cooling the apparatus, a power cable 71 for supplying power, and the like. The Z
A transformer box 8 is provided at the front end of the shaft frame 7, and a balance weight 22 for balancing the weight with the transformer box 8 is attached to the rear end. The transformer box 8 has a built-in transformer 23 capable of adjusting the power supply of an inductor by a control box (not shown) installed on the ground, and a claw cooler 57 having a large number of water injection holes on its lower surface. Is mounted on the transformer box 8, and the inductor 9 for the claw portion 51 and the tread surface 5 are mounted on the front mounting plate 8a.
A bracket 55 for assembling the inductor 11 for 2 (see FIGS. 7 and 8) and a bracket 56 for assembling the inductor 10 for the pin boss 54 are fixed.

FIG. 4 is a side view showing a state where the claw portion inductor 9 is mounted on the bracket 55. As shown in FIG. 5A is a front view of the claw inductor 9, FIG. 5B is a side view, and FIG. 5C is a plan view. FIG. 6 shows a portion X (bracket 5) in FIG.
5 is a partially cutaway plan view showing, in an enlarged scale, a front end portion of the transformer box 5. The bracket 55 has a pair of arms 55a serving also as conductors for coils of an inductor mounted on a mounting plate 8a provided on the transformer box 8. A plate 55b is welded to the tip of the arm 55a, and an insulating material 55f is interposed between the left and right arms 55a, 55a and between the plates 55b, 55b to be integrated. The plate 55c is assembled to the plate 55b by the bolt 40 and the nut 41 to form the groove 55e. Then, with the bolt 40 in a loosened state, the insertion plates 9b, 9b of the inductor 9 for the claw portion 51 or the insertion plates 11b, 11b of the inductor 11 for the tread surface 52 are inserted into the groove portions 55e. It is placed on a stopper (not shown) provided at the lower portion of the plate 55b, and the bolt 40 is tightened.
1 can be detachably attached to the bracket 55. The distal end of the bracket 56 (see FIGS. 2 and 3) also has a structure similar to that of the bracket 55, and the pin boss inductor 10 can be detachably mounted.

As shown in FIG. 5, a claw portion inductor 9 has a copper hollow coil 9a spirally formed so as to surround the claw portion 51 of the shoe 50, and two ends of the hollow coil 9a. A conductor portion is formed by the left and right copper vertical cylinders 9c, 9c, which are welded by communicating the empty portions and overlapped via the insulating material 9d. The coil 9a has a structure in which only the start end and the end are welded to the vertical cylinder 9c, and there is a possibility that a portion between the ends may hang down by its own weight. To prevent this, a coil support frame 9g and a support rod 9f are provided. ing. The coil supporting frame 9g is formed by connecting side plates 9e, 9e made of an insulating plate to both sides of a bottom plate 9k made of an insulating plate by bolting using an L-shaped member 9p, and a round bar 9m between the side plates 9e, 9e. And a bolt 73 is inserted into the side plate 9 and screwed into a screw hole of the round bar 9m to be integrated. Spacers 9j, 9j are provided on the side surfaces of the vertical cylinders 9c, 9c, respectively.
And the bolt 75 is inserted through the side plate 9e so that the spacer 9
By screwing into the screw hole at the end of j and tightening,
Attach the coil support frame 9g to the vertical cylinders 9c.
The upper end of the support rod 9f that penetrates the upper portion of the coil 9a and is connected by a nut penetrates the bottom plate 9k and is fixed with the nut, thereby supporting the coil 9a.

A copper insertion plate 9b for attachment to the bracket 55 is welded to the upper ends of the vertical cylinders 9c, 9c. In addition, an inlet joint 9h and an outlet joint 9i for cooling water are welded to these vertical cylinders 9c, 9c, respectively, and a cooling water pipe is connected to the inlet joint 9h and the outlet joint 9i to connect the vertical cylinder 9c. By circulating the cooling water inside the coil 9a through the coil 9a, the temperature rise of the coil 9a due to the heat generated in the quenched portion is prevented.

FIG. 7 is a front view of the tread inductor 11 and FIG.
(A) is a side view thereof, and (B) is a bottom view of a coil portion. As shown in FIGS. 7 and 8, the tread inductor 11 is
A pair of left and right U-shaped copper hollow coils 11v, 11w for the left and right tread surfaces 52, 52 of the shoe 50 are provided, and the starting end of one coil 11v is connected to one vertical cylinder 11c by copper L.
Inverted U-shaped copper pipe 1 in which the pipe 11n is connected by welding and the end of the coil 11v is connected to the beginning of the other coil 11w by welding.
The ends of the coils 11w are connected by welding a copper L-shaped pipe 11q to the other vertical cylinder 11d by welding. An insulating plate 11m is interposed between the left and right vertical cylinders 11c and 11d, and an insulating plate is interposed between the pipe 11n or 11q and the pipe 11t. 11h and 11i are inlet joints and outlet joints for cooling water welded to the upper ends of the vertical tubes 11c and 11d. These inlet joints 11h, the vertical tube 11c, the pipe 11n, the coil 11v, the pipe 11t, the coil 11w, Pipe 11
q, cooling water is circulated through the path of the vertical cylinder 11d and the outlet joint 11i in the same manner as described above to prevent the temperature of the coil 11a from rising.
At the upper end of each of the vertical cylinders 11c and 11d, an insertion plate 11 for attachment is provided.
b and 11b are respectively welded.

Reference numeral 59 denotes a cooler for blowing water for quenching, 1
Reference numeral 1e denotes a support plate made of an insulating material for supporting the coils 11v and 11w. The mounting plate 11k of the cooler 59 is made of an insulating material. The mounting plate 11k is provided with a screw hole on the mounting arm 11j welded to both sides of the vertical cylinders 11c and 11d, and the mounting plate 11k is inserted into the screw hole. The bolts 75 are attached by screwing. The support plate 11e is
The L-shaped member 11r welded to the vertical cylinders 11c and 11d is bolted, and the L-shaped member 11p is supported on the mounting plate 11k by bolting. The support plate 1
The upper end of the suspension rod 11f, which is inserted into the upper part of the coil 11a and connected by a nut to 1e, is connected by a nut to prevent the coils 11v and 11w from hanging down.

The cooler 59 has a rectangular parallelepiped shape, a quench water supply joint 59a is provided on the upper surface, and a number of quench water injection holes 59c are formed on the lower surface. A quench water pipe is connected to the joint 59a. Thus, quenching water is injected from the injection holes 59c.

FIG. 9A is a front view of the pin boss inductor 10, FIG. 9B is a side view, and FIG. 9C is a plan view. FIG.
As shown in FIG.
Spiral copper hollow coil 10a formed in accordance with the inner diameter of the 0 pin hole A, and right and left inverted copper L-shaped copper coils which are welded to both ends of the coil 10a and overlapped with an insulating material 10d to be integrated. A conductor is formed by the tubes 10c and 10c. A copper insertion plate 10b for attachment to the bracket 56 is welded to the ends of the upper horizontal portions of the cylinders 10c and 10c, and an inlet joint 10h and an outlet joint 10i for cooling water are welded respectively. The mounting structure and the coil cooling water supply structure are the same as those of the claw inductor 9.

The pin boss inductor 10 is provided with a pin boss cooler 58. The cooler 58 is a vertical cylinder 5
8a, a quenching water supply joint 58b welded to the upper end of the vertical cylinder 58a, and a cylindrical portion 58c provided at the lower end of the vertical cylinder 58a and having a large number of injection holes for quenching water.
The cooler 58 is mounted by welding a mounting member 10g having a screw hole to the cylinder 10c, mounting a mounting plate 10k made of an insulating material to a screw hole of the mounting metal member 10g by a bolt 77, and using an insulating material. Bracket 10f
Is attached to the mounting plate 10k with bolts 77, and the vertical cylinder 58a is tightened with the bracket 10f, whereby the cooler 58 is attached to the conductor. A quenching water pipe (not shown) is connected to the joint 58b of the cooler 58, and quenching water is injected from an injection hole of the cylindrical portion 58c to perform quenching.

Next, the positioner 2 will be described. As shown in FIG. 1 to FIG. 3, the positioner 2 has vertical frames 31, 31 erected on a base 30 installed horizontally on a base surface, and a horizontal shaft 32 is provided between the vertical frames 31, 31. The bed 33 is provided so as to be rotatable about the horizontal shaft 32, that is, to be able to take a horizontal or vertical posture by expansion and contraction of the fluid pressure cylinder 35. The bed 33 is provided with a shaft 39 perpendicular to the horizontal shaft 32, and the disc-shaped shoe mounting table 34 is rotated about the shaft 39 via a motor 36 and a power transmission gear mechanism 37. It is provided as follows. Accordingly, the fluid pressure cylinder 35 and the motor 36 are driven and controlled based on a command value of an NC device (not shown), so that the table 34 is raised and lowered and rotated, so that the table 34 is mounted on the table 34. The horizontal rotation position of the shoe 50 can be set, and the shoe 50 can be raised and lowered so as to take a horizontal and vertical posture.

Note that in FIG. 2 and FIG.
4 is a water receiving frame 34 having a concave section in order to receive quenching water on the outer periphery.
a, the used quenching water accumulated in the water receiving frame 34a is caused to flow down to the positioner water tank 64 through the gutter 63, and the casting sand, scale and the like in the quenching water are purified by a purifying device 6 such as a filter.
The quenching water system is configured to be circulated through 5 and reused.

Next, the mounting of the pallet 38 to the table 34 and the mounting structure of the shoe 50 to the pallet 38 will be described with reference to FIGS. FIG.
FIG. 11 is a plan view showing a state in which 0 is assembled to the table 34 of the positioner 2 via a pallet 38, and FIGS. 11 and 12 are views taken along arrows A and B in FIG. 10, respectively. In this case, instead of directly attaching the shoe 50 to the table 34, the shoe 50 is attached to the nail pallet 38 or the machining pallet 61 (see FIG. 13). The quenching is performed in a state of being assembled to the table 34.

In FIGS. 10 to 12, reference numeral 80 denotes a horizontal adjustment bolt of the shoe 50 for mounting the shoe 50 horizontally and at a predetermined height. At least three adjustment bolts 80 are required (five in this example) and are screwed into the pallet 38 so that the height of the protrusion from the upper surface can be adjusted.

Numeral 81 designates convex portions 81a, 8
A bracket 82 abuts against the bracket 1 b to perform horizontal positioning, and a bolt 82 presses the side surface of the shoe 50 against the bracket 81 to fix the horizontal position.

Reference numeral 83 denotes a clamp for fixing the shoe 50 so that the shoe 50 does not rise from the pallet 38. The clamp 83 includes a main body 83a bolted to the pallet 38.
The nail 83b is pivotally attached to the main body 8 by a pin 89, and the body 8
When the pin 88 is inserted and the holes 3b and 3a are aligned with each other, the claw 83b is fixed to the main body 83a.
8 is pulled out from the hole of the claw 83b, so that the lower pin 89
The claw 83b is rotatable about. Further, a shroud-50 fastening bolt 83c is provided at the tip of a part of the claws 83b.

The assembling of the shoe 50 to the pawl pallet 38 is carried out by first using a pin 88 from each of the clamps 83 at a total of five places.
, And the pawl 83b is rotated to the state shown by the two-dot chain line in FIG. 11, and the tightening bolts 82 at a total of three places are
Move to the position shown by the chain line. Pallet 3 in this state
8, the shoe 50 is placed on the mounting bolt 80 from above, and at the same time, the side surfaces of the shoe 50 are brought into contact with the projections 81 a and 81 b of the bracket 81 to set the positions in the X and Y directions.
Thereafter, the bolt 82 is tightened, the tip of the bolt 82 is pressed against the side surface of the shoe 50, and each claw 83b of the clamp 83 is rotated to contact the upper surface of the shoe 50, and a pin 88 is assembled. Further, the bolt 83c of the claw 83b is tightened. As a result, the shoe 50 can be assembled at a preset position on the pallet 38. In a state where the shoe 50 is fixed to the pallet 38 in this manner, the hook can be lifted and moved by hooking a crane (not shown) on a suspension ring 85 provided at a corner of the pallet 38.

In FIG. 10 to FIG.
Is a block for positioning the pallet 38 on the table 34, and the block 90 is a block for forming the rectangular pallet 38.
Is provided at a position where the two sides abut. 91a is a block welded on the table 34 at a position facing the other two sides of the pallet 38, 91 is the block 91a
The screw 91 is screwed into the screw hole, and when the screw 91 is screwed in, the plate 91
b is pushed out and pressed against the side surface of the pallet 38, whereby the pallet 38 is prevented from moving back and forth and right and left with respect to the table 34 and positioned. Reference numeral 92 denotes a fixing plate for preventing the pallet 38 from floating. The plate 92 is mounted on a pin 97 having its rear end fixed to the table 34,
An elongated hole 92a formed in the front portion is movably fitted to a bolt 95 screwed into the table 34.

When assembling the pallet 38 to the table 34, first, the two tightening bolts 91 are moved to the positions shown by the two-dot chain lines, and a total of four bolts 9 are mounted.
5 is loosened and the plate 92 is moved to the position shown by the two-dot chain line. The pallet 38 on which the shoe 50 is mounted is placed from above on the table 34 in this state, and at the same time, the pallet 3
The right side surfaces 38a and 38b of 8 are respectively brought into contact with the block 90. Thereafter, the pallet 38 is assembled at a preset position on the table 34 by tightening the tightening bolts 91 and moving the plate 92 to the illustrated position and tightening the bolts 95. it can.

As described above, the shoe 50 is mounted on the table 34, the motor 36 is driven and controlled to rotate about the shaft 39, and the claw 51 is set in a predetermined direction.
Next, a claw 5 of the shoe 50 is detected by a sensor (not shown).
1 is sensed, the position information is stored in a storage device attached to the controller, and the X-axis motor 13, Y-axis motor 15, and Z-axis motor of the main body 1 are stored based on the position information.
Drive and control the Z-axis frame 7 to X, Y,
The coil 9 of the claw inductor 9 attached to the transformer box 8 is moved as shown in the enlarged view of FIG.
a covers the nail portion 51 while maintaining a predetermined clearance. Next, the power supply output of the inductor of the transformer is set to the condition of hardening the claw portion, and the coil 9a is energized to generate heat in the claw portion 51 to increase the temperature. Next, by driving and controlling the motors in the same manner as described above, the Z is positioned at the position indicated by the two-dot chain line in FIG.
The shaft frame 7 is moved so that the claw cooler 57 is positioned above the heated claw 51, and quenching water is injected from the cooler 57 to rapidly cool the claw 51 to perform quenching. Next, the claw pallet 38 is removed from the table 34, and the shoe 50 is removed from the claw pallet 38, and the shoe 50 is put into a furnace for tempering (tempering). Eliminate internal residual stress.

After the tempering process, the shoe 50 is removed from the pallet 61 for machining by machining the pin hole of the shoe 50.
Attach to The machining pallet 61 has the same outer shape and structure as the claw pallet 38, and is manufactured so that it can be firmly and accurately mounted on the pallet so that the shoe 50 does not deviate from the pallet during machining. The shroud 50 can be assembled in the same manner as described above. Shoe
After machining the 50 pin holes, the pallet 61 with the shoe 50 attached is attached to the table 34 in the same manner as described above. The reason why the pin hole processing is performed after the quenching of the claw portion 51 is to prevent a dimensional change of the pin hole due to the heat generated by the quenching of the claw portion 51 due to a large heat generation amount.

FIG. 13 is a side view showing the table 34 in a vertical state, and FIG. 14 is a view taken in the direction of the arrow Z in FIG. As shown in FIGS. 13 and 14, the quenching of the pin boss portion 54 contracts the undulating hydraulic cylinder 35 of the positioner 2 to move the table 34 from the horizontal state to the vertical state. Next, after the sensing operation, the Z-axis frame 7 is moved in the same manner as described above, the coil 10a of the pin boss inductor 10 is positioned directly above the opening of the pin hole A, and the inductor power output of the transformer is reduced. The condition of the pin boss is hardened, the coil 10a is energized, and the Y-axis table 6 is lowered to remove the coil 10a.
a is inserted into the pin hole A, and the inner wall surface of the pin hole A is heated to a high temperature. Next, quenching water is injected from the cylindrical portion 58c of the pin boss cooler 58 to rapidly cool and quench the high temperature portion. Subsequently, the Y-axis table 6 is further lowered to insert the coil 10a into the pin hole B, and the inner wall surface of the pin hole B is similarly hardened. Next, the inductor 10 is pulled up once to move the Z-axis frame 7, and the other side of the pin hole D is hardened by the same lowering operation as described above. Next, by pulling up the inductor 10 and driving and controlling the motor 36, the table 34 in the vertical state is rotated by 180 degrees about the axis 39, so that the pin holes C and F
, The pin holes C, F and E are quenched as described above. As described above, the reason for performing the quenching from both directions by rotating the shoe 50 is that the small-diameter holes G and H for fitting and positioning the small-diameter portions at the tip ends of the pins due to the structure of connecting the shoe 50 with the pins 60 are used. This is because the coil 10a cannot be penetrated from one direction on one side.

The hardening of the tread surface 52 is performed by
5 is replaced with the step surface inductor 11, and the undulating hydraulic cylinder 35 of the positioner 2 is extended to return the table 34 to the horizontal state, After the sensing at 52, the motor 36 is driven and controlled to rotate the table 34 about the shaft 39, so that the tread surfaces 52, 52 are set in a predetermined direction. Next, the inductor power supply output of the transformer is adjusted to the tread hardening condition, the Z-axis frame 7 is moved to set the tread inductor 11 at a predetermined position, and the inductor 11 is depressed. surface
Then, quenching is performed by facing 52 . Thereafter, the machining pallet 61 is removed from the table 34, and
Is removed from the machining pallet 61 and the shoe 50 is tempered to remove internal residual stress caused by quenching.

As described above, the Z-axis frame 7 provided with the respective inductors of the main body 1 is moved in the X, Y, and Z directions, and the table 34 to which the shoe 50 is fixed is rotated and undulated. By doing so, the relative positions of the respective inductors 9 to 11 attached to the Z-axis frame 7 and the respective hardened portions of the shroud 50 can be sequentially set in accordance with the respective hardening steps.
Further, the output of the inductor power supply of the transformer 23 can be adjusted in accordance with the conditions of each hardening unit. Therefore, the quenching operation of the shroud 50, which was conventionally performed by three induction hardening apparatuses, can be performed by one induction hardening apparatus according to the present invention. As a result, the installation space of the quenching device can be reduced to about 1/3, and the table replacement work of the shoe 50 in each pin boss quenching step and tread quenching step after the pin hole machining is performed. It can be eliminated and setup time can be reduced. In addition, the gap between the inductor and the quenched part is adjusted by N
Since the operation can be automatically performed by the NC program command of the C device, the setup time can be further reduced. In addition, inductors 9 to
11 may be directly attached to the head of the Z-axis frame 7,
If the inductor is provided in the transformer box 8 as in this embodiment, the distance between the transformer 23 and each inductor can be shortened, and the power loss between them can be reduced. Further, since the inductor is configured to be detachable, it is not necessary to always attach three types of inductors, and the strength and size of the inductor mounting portion can be reduced to make the quenching apparatus compact, Workpieces other than -50 can be handled by exchanging inductors.

Further, since the shoe 50 is assembled to the pallet 61 and the pallet 61 is assembled to the table 34, the shoe 50 after the pin holes are machined is used for the machining pallet 61. Table 3 with assembled
4 can be easily assembled at the predetermined position, and the setup time can be further reduced.

In the above embodiment, each inductor is configured to be attachable to and detachable from the bracket, but each inductor may be fixed at a position where they do not interfere with each other. Various changes and additions are possible.

[0039]

According to the first aspect, the final stage movable body provided with the respective inductors for claw hardening, tread hardening, and pin boss hardening is moved in the X, Y, and Z directions. By rotating and raising and lowering the table on which the shoe is assembled, the relative position between each inductor and the quenched portion of the shoe can be sequentially set in accordance with each quenching step.
Since the power supply output of the inductor of the transformer can be adjusted according to the quenching conditions of each quenching part, the quenching operation of the shoe can be performed by one induction hardening device. Therefore, the installation space of the quenching device can be reduced to about 1/3, and accordingly, the moving distance of the shoe and the work can be reduced, the setup time can be shortened, and the work efficiency can be improved. be able to. Also, since the transformer is shared for each inductor, the power supply wiring to the inductor on the final stage movable body is only on the primary side of the transformer, which is simplified.

According to the second aspect, each inductor is mounted on the transformer box, and a common transformer is accommodated in each transformer in the transformer box. Therefore, the distance between the transformer and the inductor can be shortened. Power loss during the period can be reduced.

According to the third aspect of the present invention, the pallet for machining with the shoe attached thereto is assembled on the table to perform the quenching operation. Therefore, the work of removing the shoe from the pallet for machining and replacing it is eliminated. As a result, the setup time can be shortened, and the working efficiency can be further improved.

[Brief description of the drawings]

FIG. 1 is a front view showing an embodiment of an induction hardening apparatus according to the present invention.

FIG. 2 is a side view of the embodiment.

FIG. 3 is a plan view of the embodiment.

FIG. 4 is an enlarged side view showing the inductor portion of FIG. 1;

5A is a front view showing a claw portion inductor of the present embodiment, FIG. 5B is a side view thereof, and FIG. 5C is a plan view thereof.

FIG. 6 is an enlarged plan view showing a tip of the bracket of FIG. 4;

FIG. 7 is a front view showing the tread inductor of the present embodiment.

FIG. 8A is a side view showing a tread surface inductor according to the present embodiment, and FIG. 8B is a bottom view of a coil portion thereof.

9A is a front view showing a pin boss inductor of the present embodiment, FIG. 9B is a side view thereof, and FIG. 9C is a plan view thereof.

FIG. 10 is a plan view showing a state in which a shoe is assembled to a table of a positioner via a pallet in the present embodiment.

11 is a view as viewed in the direction of the arrow A in FIG. 10;

FIG. 12 is a view as viewed in the direction of arrow B in FIG. 10;

FIG. 13 is a view corresponding to FIG. 2, showing the table in a vertical state in the embodiment.

14 is a view as viewed in the direction of the arrow Z in FIG. 13;

FIG. 15A is a plan view showing a crawler, and FIG. 15B is a side view.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Main body part 2 Positioner 3 Base frame 4 X-axis frame 5 Y-axis frame 6 Y-axis table 7 Z-axis frame 8 Transformer box 9 Inductor for claw 10 Inductor for pin boss 11 Inductor for tread 12, 15, 19, 36 Motor 13, 16, 20 Worm reducer 14, 17, 21 Pinion 18 Balance cylinder 23 Transformer 30 Base 32 Horizontal axis 33 Bed 34 Table 35 Fluid pressure cylinder 38 Claw pallet 50 Shoe 51 Claw 52 Tread surface 54 Pin boss 55, 56 Bracket 57 Claw cooler 58 Pin boss cooler 59 Tread cooler 60 Connection pin 61 Processing pallet 80 Mounting Bolt 81 Positioning bracket 82 Tightening bolt 83 Fixing clamp 90 Positioning block 91 Tightening bolt 92 Solid Use pre - door

──────────────────────────────────────────────────の Continuing on the front page (72) Inventor, Misao Saito 650, Kandamachi, Tsuchiura-shi, Ibaraki Hitachi Construction Machinery Co., Ltd. (72) Inventor Itsuo Kondo 650, Kandamachi, Tsuchiura-shi, Ibaraki Hitachi, Ltd. Inside the Tsuchiura Plant (72) Inventor Hiroyuki Aoki 650, Kunitachi-cho, Tsuchiura-shi, Ibaraki Prefecture Inside Hitachi Construction Machinery Engineering Co., Ltd. (56) References JP-U 4-99219 (JP, U) JP-U 4-48251 (JP, U) JP-B-56-21047 (JP, B2) JP-B-4-1444 (JP, Y2) (58) Fields investigated (Int. Cl. ⁷ , DB name) C21D 9/00-9/44 C21D 9 / 50 C21D 1/10 C21D 1/42

Claims (3)

(57) [Claims] (1)A claw protruding from one side of the crawler shoe;
Tread surfaces formed on both sides of the claw portion, and how the claw portion projects
Crawler shoe provided in a direction perpendicular to the direction
Induction hardening of pin boss for connecting pin insertion
And  X-, Y- and Z-axis three-dimensional positioning device
For the final stage headA claw inductor surrounding the claw
A tread inductor facing the tread surface; and
Structure to attach to the pin boss inductor to be inserted into the embossed part
age,  A transformer common to each inductor on the head of the final stage movable body
A crawler shoe near the three-dimensional positioning device.
And a table with,Swivel the tableDevice
WhenAnd a positioner consisting of a device for raising and lowering, The tread surface and the claw portion are equipped with the crawler shoe.
Place the table in a horizontal position and quench it.
The part is in a vertical position in which the table is erected by the undulating device.
Has a configuration to perform quenching Characterized by high laps
Wave hardening equipment. 2. The transformer according to claim 1, wherein a transformer box containing the transformer is provided on the head of the final stage movable body, and a front surface of the transformer box is for a claw portion of a lash, a tread surface, and a pin boss portion. An induction hardening device characterized in that it has a structure in which each inductor is mounted. 3. An induction hardening method using the induction hardening apparatus according to claim 1 or 2, wherein the crawler shoe is fixed to a table of the positioner in a state where the crawler shoe is mounted on a machining pallet. Induction hardening method characterized by the above-mentioned.