JPS6257411B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an induction heating device that supplies lubricant to a metal to be heated by a heating coil.

[Prior art]

Generally, the metal to be heated (hereinafter referred to as the object to be heated) is
Warm forging involves heating to 300°C to 900°C.
Since this temperature region corresponds to the region where the frictional resistance is greatest, the product may elongate during forging, or
There is also the problem that precision forging is not possible due to poor fitting, etc. To solve this problem, it is common to apply a lubricant such as lubricant to the surface of the heated object before forging. is being carried out. In this case, if the above-mentioned lubricant is heated immediately after application, the vaporized components of the lubricant may adhere to the furnace wall of the heating coil that constitutes the induction heating device, damaging the coil. 100℃
It is normal to heat the product to ~300℃, apply a lubricant to the heated object, and after the vaporized components of the lubricant evaporate due to the heat of the heated object, warm forging is performed by heating with a heating coil. be.

An example of the layout of the above-described preheating, furnace, lubricant application means, heating coil, etc. in a conventional apparatus will be explained with reference to FIGS. 1 and 2. In the figure, 1 is the object to be heated, 2 is the first material supply device that continuously discharges the objects 1 to be heated one by one, and 3 is a straight line that carries the objects 1 to be heated discharged from the material supply device 2. A slat conveyor, 4 a pinch roller for feeding the heated object 1, 5 a heating coil, 6 a slat conveyor 3, a pinch roller 4, a heating coil 5,
It is a matching unit that arranges 7 is a forging press, 8 is a first conveyor, and as shown in FIG. 2, a complex structure having a descending section 81, a flat section 82, and an ascending section 83 is used. 9 is a lubricant made of lubricating oil, 10 is a bath filled with the lubricant 9, and 11 is a preheating furnace, which normally heats the object 1 using heavy oil. 12 is a linear second conveyor configured to pass through the preheating furnace 11, and 13 is a second material supply device.

In operation, the objects 1 to be heated are continuously supplied one by one from the second material supply device 13 and passed through the preheating furnace 11 by the linear second conveyor 12 to a temperature of 100° C.
Heated to 300℃. Thereafter, the object to be heated 1 is first conveyed into the bathtub 10 by the descending part 81 of the special first conveyor 8, which is different from other linear conveyors, and then is carried into the bathtub 10 by the flat part 82. The object to be heated 1 is passed through and coated with the lubricant 9, after which the object to be heated 1 is carried out of the bathtub 10 by the rising section 83 and then fed to the first material feeding device 2.

The first material supply device 2 is the second material supply device 1
As in 3, the objects to be heated 1 are successively conveyed one by one onto the linear slat conveyor 3 and are forced into the heating coil 5 by the pinch rollers 4, but in the process up to this point, the vaporized components of the lubricant 9 are The heating element 1 is dried by the heat it possesses, and the lubricating particles are attached to the heated element 1 at a predetermined temperature (300°C to 900°C).
After being heated, it is sent to a forging press 7, where the lubricating particles play the role of lubrication and precision forging is performed.

In the conventional induction heating device as described above, there is a step of preheating the heated object 1 and a process of applying a lubricant 9 to the heated object 1.
In the process of coating the object to be heated and the step of heating the object to be heated 1, the object to be heated 1 is connected to an independent slat conveyor 3, a first conveyor 8, a second conveyor 1
2 to be transported in different directions, the device has many components, the structure becomes complicated, and the line space becomes large. The first conveyor 8 for carrying out the heated object 1 from the bathtub 10 must have a complex structure including a descending section 81, a flat section 82, and an ascending section 83 so that the lubricant 9 can be applied. There were flaws.

[Summary of the invention]

In view of the above-mentioned conventional situation, it is an object of the present invention to provide an induction heating device equipped with a coating means that enables lubricating oil to be coated without using a conveyor with a complicated structure in the conventional device. It is equipped with a jetting nozzle that is located between the preheating coil and the heating coil and jets lubricant to the object to be heated to the side opposite to the preheating coil.

[Embodiment of the Invention] An embodiment of the invention will be described below with reference to FIGS.
FIG. 5 will be explained. 1 to 7, 9 in the figure
is the same as the conventional one, so the explanation will be omitted.

Reference numeral 14 is a preheating coil for inductively heating the surface of the heated object 1 to 100 DEG C. to 300 DEG C., and is made of a water-cooled copper tube wound spirally and coated with heat-resistant insulating paint over the entire surface. 15
is a hollow ring-shaped jet nozzle that surrounds the object to be heated 1, and has a plurality of jet ports 151 on the opposite side to the preheating coil 14 and inside. 16
In order to increase the efficiency of applying the lubricant 9, a tapered cylindrical lubricant reflector is attached to the jet nozzle 15. Reference numeral 17 denotes a recovery bath for recovering the lubricant 9 overflowing from the lubricant reflector 16, 18 a recovery pipe, and 19 a lubricant tank for storing the lubricant 9 flowing from the recovery bath 17 through the recovery pipe 18. It is. 20 is a stirring device that prevents lubricant particles from settling; 21 is a pump that pressurizes and delivers the lubricant 9 in the lubricant tank 19; and 22 is a jet nozzle 1.
This is a supply pipe that supplies lubricant 9 to 5.

100 is a lubricant supply device that includes a jet nozzle 15, a jet port 151, a lubricant reflector 16, a recovery bath 17,
Recovery pipe 18, lubricant tank 19, stirring device 2
0, a pump 21, and a supply pipe 22. Reference numeral 23 denotes a support device for transporting the object to be heated 1, which is composed of two parallel rails arranged substantially linearly between the preheating coil 14 and the heating coil 5. It's bent. The centers of the preheating coil 14, the heating coil 5, and the hollow ring-shaped jet nozzle 15 are located substantially in a straight line, and the jet nozzle 15 and the preheating coil 14 are attached to the recovery bath 17. (Not shown) In operation, the objects to be heated 1 are continuously supplied one by one from the first material supply device 2, are carried on a linear slat conveyor 3, and are forced into a preheating coil 14 by a pinch roller 4. be done. 100 with preheating coil 14
The object to be heated 1 whose temperature has been raised to .degree. C. to 300.degree. C. is discharged from the preheating coil 14 and carried into the lubricant reflector 16 through the hollow ring-shaped jet nozzle 15 by the support device 23. The lubricant 9 is ejected from the ejection port 151 in the opposite direction to the preheating coil 14 and inwardly, but since it is pressurized, the lubricant 9 is not only applied to the heated object 1 but also hits the heated object 1. Since the lubricant 9 that bounces off hits the lubricant reflector 16 and bounces back again to coat the heated object 1, the process is repeated, resulting in good coating efficiency. Furthermore, since the objects to be heated 1 are carried in continuously, the supporting device 23 is bent into a mountain shape inside the lubricant reflector 16 so that the end surfaces of the objects to be heated can be coated. The end face of 1 is exposed, and a lubricant 9 is applied to this part. The lubricant 9 is applied and the heated body 1 is transferred towards the heating coil 5, but during this time the vaporized components in the lubricant 9 are heated to 100°C.
Since it is heated to ~300°C, it evaporates and by the time it reaches the heating coil 5, only lubricating particles are attached to the surface of the heated body 1. The object to be heated 1 is heated to 300° C. to 900° C. by a heating coil 5 and then warm-forged by a forging press 7.

In this case, precision forging becomes possible because the lubricating particles act as a lubricant.

On the other hand, the lubricating oil supply device 100 has a lubricating oil reflector 16
The lubricant 9 overflowing from the tank is collected in a collection bath 17 and enters a lubricant tank 19 through a collection pipe 18. In the lubricant tank 19, a stirring device 20 continues to stir the lubricant particles so that they do not settle, so that a uniform lubricant 9 can be stored therein.

The lubricant 9 sent out under pressure by the pump 21 is passed through the supply pipe 22 to the hollow ring-shaped jet nozzle 15.
The cycle of being supplied to and being ejected from the ejection port 151 is repeated.

In this invention, as described above, a lubricant applicator 100 that continuously supplies lubricant 9 to the object to be heated 1 moving on the support device 23 and applies the lubricant 9 to the preheating coil 14
Since the preheating coil 14 and the heating coil 5 are arranged between the preheating coil 14 and the heating coil 5, the number of components of the device is reduced, and the distance between the preheating coil 14 and the heating coil 5 is shortened.
This results in less temperature drop, resulting in an energy-saving device. Furthermore, since the preheating coil and the heating coil are located on the same coil center, there is an advantage that by inserting a dummy bar, the heated bodies of both coils can be heated while the entire body is discharged to the forging press.

In the above embodiment, the support device 23 is bent into a chevron shape, but the same effect can be achieved even if the support device 23 is bent downward.

〔Effect of the invention〕

As described above, according to the present invention, the preheating coil is brought close to the injection nozzle by providing the injection nozzle that is located between the preheating coil and the heating coil and injects the lubricant to the object to be heated to the side opposite to the preheating coil. This has the effect of reducing the line space.

[Brief explanation of the drawing]

Figures 1 and 2 are diagrams showing a conventional induction heating device, where Figure 1 is a plan view and Figure 2 is a -
3 to 5 are cross-sectional views taken along the line in the direction of the arrows, and are views showing one embodiment of the present invention.
The figure is a side view, Figure 4 is a partially enlarged side view of Figure 3,
FIG. 5 is an enlarged sectional view of the injection nozzle in FIGS. 3 and 4. FIG. In the figure, 1 is the metal to be heated, 5 is the heating coil,
9 is a lubricant, 14 is a preheating coil, 15 is a jet nozzle, 16 is a lubricant reflector, 23 is a support device, 10
0 is a lubricant supply device, and 151 is an injection port. Note that the same reference numerals in the figures indicate the same or equivalent parts.

Claims (1)

[Claims] 1. A heating coil, a preheating coil provided before the heating coil, a support device that supports a plurality of metals to be heated that are transferred from the preheating coil to the heating coil, and the heating coil. and the preheating coil, the induction heating device comprising: a lubricant supply device having a spouting nozzle for spouting lubricant to the metal to be heated to a side opposite to the preheating coil. 2. The lubricant supply device is characterized by having a lubricant reflector in the vicinity of the ejection nozzle that reflects the lubricant that has been ejected from the ejection nozzle onto the heated metal and then scattered from the heated metal back to the heated metal. An induction heating device according to claim 1. 3. The induction heating device according to claim 1 or 2, wherein the jet nozzle has a plurality of jet ports provided inside a hollow ring.