JPH07233412A - Hardening and tempering apparatus - Google Patents

Abstract

PURPOSE:To improve the efficiency of heat treatment by arranging a high-frequency induction hardening zone of a work formed with sintering in a gear- shape, a tempering zone for executing a low-frequency induction tempering simultaneously to the integer multiple number of works for a cycle time multiple as long as that in the hardening zone and a means for carrying the work between these zones in a single apparatus. CONSTITUTION:The hardening zone Z1 and the tempering zone Z2 are arranged in the apparatus 14. Further, this apparatus is provided with a first carrying device 51 for putting the work W on it and carrying the work W, from a delivery position of the work to a receiving position of the work of a rotary table 23 in the hardening zone Z1, a second carrying device 52 for shifting the work W completed with the hardening from a delivery position of the work of the rotary table 23 to the tempering position Z2 and a carrying device 53 for delivering the work W completed with the tempering to the following process. Further, an elevating/lowering rotating device 40 for simultaneously elevating/ lowering and rotating plural works W is arranged at the lower part of a low-frequency induction tempering device 44 in the tempering zone Z2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a quenching and tempering device for imparting predetermined hardness and rigidity to a work such as a gear.

[0002]

2. Description of the Related Art Iron-based parts such as gears for vehicles are hardened and tempered before they become final products so as to obtain predetermined hardness and rigidity. In the case of continuously producing a large amount of such iron-based parts, quenching and tempering are performed in the middle of the production line, but the time required for tempering is approximately twice the time required for quenching. In the prior art, a quenching device and a tempering device are separately arranged, one quenching device is provided with two tempering devices, and a work after quenching is stocked.

[0003]

As described above, in the conventional case, the quenching device and the tempering device are separate,
There are problems that the number of devices itself increases and the processing efficiency of the work is inferior, and restrictions are imposed when assembling the manufacturing line.

[0004]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention provides a quenching zone for quenching one or a plurality of workpieces, and an integral multiple work with a tact time that is an integral multiple of the tact time in the quenching zone. The tempering zone for simultaneously tempering and the conveying device for conveying the work from the quenching zone to the tempering zone were arranged in a single device.

Here, the quenching zone is provided with a rotary table which rotates in sequence along a work receiving position, a quenching position and a paying-out position, and the tempering zone raises and lowers to rotate and rotate a plurality of works at the same time. A device can be provided.

[0006]

The work which has been quenched in the quenching zone is sent to the tempering zone by the transporting device, and when a predetermined number of workpieces are accumulated in the tempering zone, the predetermined number of workpieces are simultaneously tempered.

[0007]

Embodiments of the present invention will be described below with reference to the accompanying drawings. Here, FIG. 1 is an overall process diagram of a gear manufacturing apparatus in which a quenching and tempering apparatus according to the present invention is incorporated. The gear manufacturing apparatus uses a raw material powder obtained by mixing iron, which is the main component of the mixer 1, with several kinds of elements and the like. The raw material powder thus prepared is fed into the press molding apparatus 2 in a fixed amount, and is molded into a gear shape under high pressure.

Then, after removing the burrs on the surface of the molded body formed into a gear shape by the simple deburring device 3, the molded bodies are placed one by one on a ceramic tray and baked while being placed on the ceramic tray. After passing through the inside of the furnace 4, the sintering of the molded body is completed.

Then, the sintered body carried out from the sintering furnace 4 is transferred by the transfer device 5 to the transfer device 6 while changing its direction, and is transferred to the vicinity of the end of the transfer device 6 while being naturally air-cooled. After being separated from the ceramic tray by, the ceramic tray is inspected for cracks by the crack inspecting device 7, and then the normal ceramic tray is conveyed again to the vicinity of the inlet of the sintering furnace 4, and the sintered body is stored in the stock station. 8 through a deburring device 9 and a phase matching device 10 and a sizing device 11
Then, the sintered body is re-compressed in the sizing device 11 to remove the thermal strain and dimensioned.

After that, the tooth surface precision of the sintered body is obtained by the rolling device 12, and the payout device 13 is used to take into consideration the difference in quenching strain depending on the surface shape, and one of the front and back surfaces of the sintered body is taken into consideration. The upper surface is discharged to the quenching and tempering device 14 according to the present invention, and the quenching and tempering device 14 continuously quenches and tempers the sintered body, and then the cleaning device 15
And, it is taken out as a product through the magnetic flaw detection station 16.

Next, details of the quenching and tempering device 14 are shown in FIG.
It will be described with reference to FIG. Here, FIG. 2 is a front view of the quenching and tempering device, FIG. 3 is a plan view of the quenching and tempering device, FIG. 4 is a side view seen from the direction A in FIG. 2, and FIG. 5 is a view seen from the direction B in FIG. A side view, FIG. 6 is a plan view of the induction hardening apparatus, FIG. 7 is a cross-sectional view taken along the line CC of FIG. 6, FIG. 8 is a plan view of the low frequency tempering apparatus, and FIG. 9 is a view in the direction D of FIG. is there.

The quenching and tempering device 14 defines a quenching zone Z1 and a tempering zone Z2 in the box-shaped case 20 by a partition wall 21, and an opening 22 in which the quenching zone Z1 and the tempering zone Z2 are formed in the partition wall 21. Are in communication with each other.

A rotary table 23 is arranged in the quenching zone Z1. Work receiving portions 24 are formed on the rotary table 23 at equal intervals in the circumferential direction, and the work receiving portions 24 are structured to support the outer circumference of the work around the through holes. Then, the rotary table 23 is intermittently rotated by the motor 25 so that the respective work receiving portions 24 are stopped for a predetermined time at the work receiving position, the quenching position and the payout position.

Below the quenching position, an elevating and rotating mechanism 2 is provided.
6 is provided. The elevating and rotating mechanism 26 includes a motor 27 for rotating the work W and a cylinder unit 28 for elevating and lowering the motor 27. The work W held in the work receiving portion 24 of the rotary table 23 is moved to the motor 27 by the cylinder unit 28. The work W is lifted up to the position of the induction hardening device 30 and rotated by the holding part attached to the rotary shaft of the motor 27 by raising the temperature.

The induction hardening apparatus 30 comprises a base plate 3
The ring-shaped member 32 is arranged on the upper part 1. This annular member 32
Form a cooling water passage 32a therein and a hole 32b for ejecting the cooling water toward the outer peripheral surface of the work W on the inner peripheral surface.
Is formed. In addition, along with the annular member 32, the transformer 33
The coil 34 for high frequency induction heating connected to is arranged.

On the other hand, an elevating and rotating mechanism 40 is provided below the tempering zone Z2. This lifting rotation mechanism 40 has 2
A pair of motors 41 for simultaneously rotating one work W,
41 and a cylinder unit 42 for raising and lowering these motors 41, 41, and sensors 43, 43 for detecting the work W are arranged above the respective motors 41, 41.

By raising the motors 41, 41 by the cylinder unit 42, the motors 41, 41 are
The two work pieces W are lifted up to the positions of the low frequency tempering devices 44, 44 and rotated by a holding part attached to the rotating shaft of the above.

As shown in FIGS. 8 and 9, the low-frequency tempering device 44 has an annular low-frequency induction heating coil 46 connected to a transformer 49 mounted on a base plate 45 via a coil retainer 47. There is. The low-frequency induction heating coil 46 has a concave portion 48 facing the work W inside. The low-frequency tempering device 44 includes a pair of low-frequency induction heating coils 46, and these low-frequency induction heating coils 46 move forward and backward by the operation of the cylinder unit 50.

On the other hand, the quenching and tempering device 14 includes a first carrying device 51, a second carrying device 52 and a third carrying device 5.
Equipped with 3.

The first transfer device 51 is the payout device 1
3 is a device that conveys the work W from No. 3 to the work receiving position of the rotary table 23 in the quenching zone Z1 of the quenching and tempering device 14. And a chuck 57 for holding the work W from above is provided at the tip of the arm 56.
It has a structure with attached.

The second transfer device 52 is a device for transferring the work W, which has been hardened, from the work payout position of the rotary table 23 to the tempering zone Z2. The second transfer device 52 is the rotary table 23. Between the workpiece payout position and the tempering zone Z2, two transport plates 59 that are reciprocally moved by the cylinder unit 58 are arranged left and right apart from each other. Then, each of the transport plates 59 is provided with two work receiving portions 60, 60 having a structure for supporting the outer circumference of the work around the hole, and two work W are provided.
I try to temper it at the same time.

Further, the third transfer device 53 is a device for transferring the work W, which has been tempered, to the cleaning device 15 which is the next step, and this third transfer device 53 is the same as the first transfer device 51. A traveling member 62 is engaged with a rail member 61 that is horizontally installed on the arm 6, and the traveling arm 62 is capable of moving up and down.
3 is provided, and chucks 64, 64 for holding the work W from above are attached to both ends of the arm 63.

In the above, the work W is set on the work receiving part 24 at the work receiving position of the rotary table 23 in the quenching zone Z1 by the first transfer device 51. Then, the rotary table 23 is rotated by 120 ° and the work W set on the work receiving portion 24 is brought to the quenching position.

After that, the cylinder unit 28 of the elevating and rotating mechanism 26 expands, and the work W is held inside the annular member 32 of the induction hardening apparatus 30 while the work W is held by the holding portion attached to the rotating shaft of the motor 27. And apply a high frequency to the coil 34 to heat the outer peripheral surface of the work W,
Quenching is performed by ejecting cooling water from the hole 32b to the outer peripheral surface of the work W. The tact time for this quenching is 8.5 seconds.

After the above quenching is completed, the rotary table 23 is rotated again by 120 ° so that the quenched work W set on the work receiving portion 24 is brought to the payout position. At this time, the work W to be quenched next faces the quenching position.

The work W which has been rotated to the payout position of the rotary table 23 is set on one of the two work receiving portions 60 formed on the carrying plate 59 by the second carrying device 52. In the same manner, the work W for which one quench has been completed is set in the remaining work receiving portion 60.

Two workpieces W on one carrier plate 59
Is set, the transport plate 59 is sent to the tempering zone Z2 by the operation of the cylinder unit 58. Then, when the transport plate 59 on which the two workpieces W are set is sent to the tempering zone Z2, the cylinder unit 42 of the lifting / lowering rotation mechanism 40 expands, and the workpieces are respectively held by the holding portions attached to the rotation shafts of the motors 41 and 41. While holding W, the work W is lifted to a position detected by the sensor 43.

After that, the cylinder unit 50 is operated by the signal from the sensor 43, the pair of low frequency induction heating coils 46 of the low frequency tempering device 44 are moved forward, and the recess 48 of the low frequency induction heating coil 46 is moved. The workpiece W is positioned so as to wrap inside, and in this state, the workpiece 41 is rotated by the motor 41, and a low frequency is applied to the coil 46 to perform tempering. The tempering tact time is set to 17 seconds, which is double the quenching tact time.

Although the tempering tact time is twice as long as the quenching tact time in the embodiment, it may be an integral multiple such as 3 times or 4 times. In this case, quenching and tempering can be efficiently performed by simultaneously tempering the work W of an integral multiple.

[0030]

As described above, according to the present invention,
A quenching zone for quenching one or a plurality of workpieces and a tempering zone for simultaneously tempering an integral multiple work with an integral multiple takt time of the quench zone are arranged in a single apparatus, Since the work is conveyed from the quenching zone to the tempering zone, it is possible to quench and temper the work continuously while keeping the takt time in the quenching zone and the tempering zone, and to build a production line. The degree of freedom in starting is greatly improved.

In particular, a rotary table is provided in the quenching zone to move the workpieces in order along the receiving position, quenching position, and payout position of the workpieces, and a raising / lowering rotation device is provided in the tempering zone to simultaneously raise and lower a plurality of workpieces. Also, if it is rotated, the structure of the quenching and tempering device itself can be simplified.

[Brief description of drawings]

FIG. 1 is an overall process diagram of a gear manufacturing apparatus incorporating a quenching and tempering apparatus according to the present invention.

FIG. 2 is a front view of the quenching and tempering device.

FIG. 3 is a plan view of the quenching and tempering device.

FIG. 4 is a side view seen from the direction A in FIG.

FIG. 5 is a side view seen from the direction B in FIG.

FIG. 6 is a plan view of an induction hardening device.

7 is a sectional view taken along line CC of FIG.

FIG. 8 is a plan view of a low frequency tempering device.

9 is a view in the direction of arrow D in FIG.

[Explanation of symbols]

14 ... Quenching and tempering device, 20 ... Case, 23 ... Rotary table, 24 ... Work receiving part, 25 ... Motor, 26,
40 ... Lifting / rotating mechanism, 30 ... Induction hardening device, 32 ...
Annular member, 34, 46 ... coil, 44 ... low frequency tempering device, Z1 ... quenching zone, Z2 ... tempering zone, W
…work.

Claims (2)

[Claims] 1. A quenching zone for quenching one or a plurality of workpieces, a tempering zone for simultaneously tempering an integral number of workpieces at a tact time that is an integral multiple of the takt time in the quenching zone, and the quenching zone. A quenching and tempering device, wherein a transporting device for transporting a work to a tempering zone is arranged in a single device. 2. The quenching and tempering apparatus according to claim 1, wherein the quenching zone is provided with a rotary table which sequentially rotates along a work receiving position, a quenching position and a payout position, and the tempering zone is provided in the tempering zone. Is a quenching and tempering device, which is provided with an elevating and rotating device for simultaneously elevating and rotating a plurality of works.