JPH1068014A - Annealing furnace for metallic part and annealing method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an annealing furnace for metallic parts having good thermal efficiency, small size and good economical efficiency at low cost. SOLUTION: A conveying means 16 laying the metallic parts 14 is passed through a furnace body 12 of the annealing furnace 10. A shifting means for shifting in the furnace body 12 at the same speed as the conveying means 16 is installed, and electric heating means 20 for heating the metallic parts 14 while coming into contact with the metallic parts 14, are fitted to the shifting means with the fixed interval. The electric heating means 20 is composed of arms for an anode and a cathode and the metallic parts 14 shifted while laying the conveying means 16 is held with the arms and electrically heated. Further, the conveying means 16 laying the metallic parts 14 is passed through the inner part of the annealing furnace 10 and thereafter, passed through a cooling device 32 to cool the metallic parts 14. Thereafter, the conveying means 16 laying the metallic parts 14 is guided to a metal working machine 34 to execute plastic working of the metallic parts 14.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an annealing furnace for a metal product for producing a metal product of a predetermined shape by performing several-order plastic working from a metal component, and a method for annealing the same.

[0002]

2. Description of the Related Art In a golf putter, for example, in order to convert a metal part into a metal product having a final shape, the metal part is subjected to plastic working stepwise in several steps. When performing plastic working at each stage, annealing is generally performed before plastic working in order to prevent cracking and breakage of the product. Here, FIG. 6 shows a process of plastic working of a conventional general metal part. A metal part 52 formed in a predetermined shape and size from a metal material 50 by punching, cutting, or the like.
Is plastically processed by a metal working machine 54 such as a press machine.
The plastically processed metal part 56 is placed on a tray 58 or the like, placed in an annealing furnace 60 and annealed. After being cooled, the annealed metal part 56 is further cooled by a metal working machine 62.
Thereby, the metal part 64 is plastically worked. The processed metal part 64 is further annealed. As described above, the metal part 52 is completed into the final product 66 by repeating the plastic working and the annealing several times.

Conventional metal part annealing furnaces include a box type annealing furnace and a tunnel type annealing furnace. Here, FIG. 7 shows a box-shaped annealing furnace. The box-shaped annealing furnace 68 has a heating means 70 inside, and places a metal part 72 subjected to plastic working on a tray 74 and puts the tray 74 into the box-shaped annealing furnace 68 to anneal the metal part 72. . After the annealing, the tray 74 is moved to the cooling chamber and replaced with the next tray 74.
As described above, the annealing of the metal component 72 in the box-shaped annealing furnace 68 is performed by performing an annealing operation on the metal component 72 in tray units. Next, FIG. 8 shows a tunnel type annealing furnace. The inside of the tunnel type annealing furnace 76 has a conveying means 7 such as a belt conveyor.
8 penetrates and has a heating means 70 inside. In this tunnel type annealing furnace, the plastically worked metal parts 80 are collected and arranged by a parts feeder (not shown), and then sequentially sent to the annealing furnace 76 by the conveying means 78 to be annealed. The heating means 70 installed inside the annealing furnaces 68 and 76 shown in FIGS. 7 and 8 uses an electric heater, scum and petroleum as an energy source.

[0004]

SUMMARY OF THE INVENTION Conventional annealing furnaces 68, 7
The heating means 70 heats the metal component 72 indirectly by radiant heat to perform annealing, and the inside of the annealing furnaces 68 and 76 becomes high temperature. As a result, in the conventional annealing furnace and its annealing method, the metal part 72 is indirectly heated, so that the thermal efficiency is poor, and the entire furnace has to be made large, which is not economically efficient. Further, in order to raise the temperature of the entire interior of the annealing furnace, the furnace body of the annealing furnace must be made safe, and the furnace body of the annealing furnace is costly. Further, when the box-type annealing furnace shown in FIG. 7 is used, it is necessary to replace the trays placed in the furnace, so that there is a drawback that the flow operation cannot be performed and the working efficiency is poor.

The present invention has been made in view of the above points, and has as its object to provide a small-sized, low-cost, and economically efficient annealing furnace for metal parts with good thermal efficiency. A further object of the present invention is to provide a method for annealing metal parts, which makes it possible to shorten the production time and reduce the production cost by making most of the entire process unmanned.

[0006]

Means for Solving the Problems To achieve the above object, an annealing furnace according to the present invention is a metal part annealing furnace for annealing plastically processed metal parts, comprising: a furnace main body and an inside of the furnace main body. Conveying means for mounting and passing the metal component,
An electric heating means provided in the furnace main body and having an anode and a cathode, and having an electric heating means for applying electric heating to an object in contact with the anode and the cathode; , And the metal part is electrically heated.

According to the annealing method of the present invention, an anode and a cathode of energizing heating means for energizing and heating a metal part placed on a conveying means and passing through the inside of the annealing furnace and contacting the anode and the cathode inside the annealing furnace are provided. The metal part is heated by contacting the metal part with the metal part, and then the metal part placed on the transporting means is cooled by passing through a cooling device. The plastic working is performed.

[0008]

Next, the present invention will be described with reference to the drawings. FIG. 1 is a view showing one embodiment of an annealing furnace for metal parts according to the present invention. Annealing furnace 1 for metal parts according to the present invention
Reference numeral 0 denotes a furnace main body 12, a conveying means 16 such as a belt conveyor for sequentially passing the plastically processed metal parts 14 into the furnace main body 12, and an annular moving means 18 for moving inside the furnace main body 12. A heating means 20 for heating the metal component 14 which is attached to the moving means 18 at a constant interval. As shown in FIG. 2, the electric heating means 20 is composed of a pair of arms 22a and 22b which are divided into two as an anode electrode and a cathode electrode. The energization heating means 20 functions to hold the plastically processed metal part 14 by the pair of arms 22a and 22b, and to heat the metal part 14 held by the pair of arms 22a and 22b. Work. The energization heating means 20 includes a pair of arms 22a,
22b, but is not limited to two arms in order to hold the metal component 14.

A metal part 14 is provided inside the furnace body 12.
An infrared temperature sensor 24 for measuring the annealing temperature of the substrate is attached. Outside the furnace body 12, the metal parts 1
A control circuit 26 is provided for controlling the annealing temperature of the metal component 14 by adjusting the voltage, the current, and the conduction time of the conduction heating means 20 according to the annealing state of No. 4. The control circuit 26 further controls the moving speed of the conveying means 16 and the moving speed of the moving means 18 to be the same.

As shown in FIG. 1, the plastically worked metal part 14 is first aligned by a parts feeder 28, and then placed on the conveying means 16 from the parts feeder 28 and sent to the annealing furnace 10. Annealing furnace 1
An air curtain is provided at the entrance of 0 to remove metal powder and the like adhering to the plastically processed metal part 14 before annealing. Each metal part 14 carried inside the annealing furnace 10
Is held by a pair of arms 22a and 22b which are moved by the moving means 18 at the same speed as the transport means 16. At the same time, the pair of arms 22a, 22
b, the metal part 14 is heated to a temperature required for annealing (for example, 1150 ° C. if the metal part 14 is stainless steel). The interior of the annealing furnace 10 is preferably filled with an inert gas or evacuated so that the metal parts 14 do not oxidize. The tips of the pair of arms 22a and 22b are desirably in the form of sharp nails 30a and 30b as shown in FIG. By making the tips of the pair of arms 22a and 22b sharp nail portions 30a and 30b,
By reducing the contact area, it is possible to prevent the occurrence of sparks generated when the metal component 14 comes into contact with the metal component 14 and to prevent the surface of the metal component 14 from being damaged.

When the metal part 14 reaches the vicinity of the outlet of the furnace body 12 by the transfer means 16, a pair of arms 22a, 22a
b moves away from the metal part 14. The transporting means 16 on which the metal parts 14 are placed then exits the annealing furnace 10 and exits the cooling device 32.
And the metal part 14 is cooled in the cooling device 32. The conveying means 16 that has exited the cooling device 32 is
Thereafter, the metal part 14 is moved to the metal working machine 34, and the next plastic working is performed on the metal component 14 by the metal working machine 34. The metal part plastically processed by the metal processing machine 34 is sent to the parts feeder 28. Alternatively, the metal part subjected to the plastic working by the metal working machine 34 may be sent to the annealing furnace 10 again without being sent to the parts feeder 28 while being placed on the transfer means 16. Here, if the mold of the metal working machine 34 is changed every time the plastic working is performed, the final product can be manufactured by performing the continuous working. As described above, according to the present invention, most of the entire process is unmanned, the production time can be reduced, and the production cost can be reduced. The annealing according to the present invention can be applied to any metal parts including bolts, nuts, pipe joints, nozzles, die-cast products, etc., and the size does not matter.

Next, another embodiment of the electric heating means used in the present invention is shown in FIG. In the embodiment shown in FIG. 1, the energization heating means 20 including the anode and the cathode is moved by one moving means 18, but in FIG. 3, the anode and the cathode are moved by separate moving means. . A pair of moving means 36a,
36b is arranged. The pair of moving means 36a, 36
b moves at the same speed as the transfer means 16. A cylinder 40a whose tip 38a is displaceable is attached to the one moving means 36a at fixed intervals, and a cylinder 4 whose tip 38b is displaceable is attached to the other moving means 36b.
0b are attached at regular intervals. This cylinder 4
0a is used as the anode of the electric heating means, and the cylinder 40b is used as the cathode of the electric heating means. Since the moving means 36a, 36b and the transporting means 16 move at the same speed, the tip portions 38a, 38b of the cylinders 40a, 40b are kept in contact with the metal component 14 which is mounted on the transporting means 16 and moves. Moving. That is, the metal component 14 comes into contact with the anode and the cathode of the electric heating means and is heated.

The electric heating means shown in FIG.
0, two parallel rails 42 installed at a fixed interval above the transport means 16.
a, 42b. One rail 42a is used as an anode and the other rail 42b is used as a cathode. In addition, the rail 4 is moved so that the metal part 14 contacts both the rails 42a and 42b.
The distance between 2a and 42b is set. The conveying means 16
The metal part 14 fed into the annealing furnace 10 by
Passes through the annealing furnace 10 while simultaneously contacting the rails 42a and 42b, and is energized during the passage. The shapes of the rails 42a and 42b in the entrance direction of the annealing furnace 10 are curved outward in a C shape. Thereby, the opening for taking in the metal component 14 fed by the transporting means 16 is widened, and the metal component 14 is connected to the rails 42a,
It can be reliably fed during 42b.

The energizing and heating means shown in FIG. 5 comprises two rows of ball bearings 44a and 44b which are installed above the transporting means 16 at regular intervals. Each ball bearing 44a, 44b includes a number of metal balls 46a, 46b, for example, the metal ball 44a serves as an anode and the metal ball 44b serves as a cathode. The metal parts 14 sent into the furnace by the transfer means 16 are the ball bearings 44a, 44
b while passing through the metal balls 46a and 46b while simultaneously contacting the metal balls 46a and 46b. Note that the ball bearings 44a and 44b themselves may be moved at the same speed as the transfer means 16.

[0015]

As described above, according to the annealing furnace for metal parts according to the present invention, unlike the conventional indirect annealing using a heater or the like, the metal parts are directly contacted and energized. It will be good. In addition, in the case of the present invention, the annealing time can be shortened because electric current is directly supplied to the metal component, and a conventional furnace body that is strong and withstands high temperatures is not required, and the furnace body can be downsized. Therefore, the area required for the equipment is small, and the product production line can be small. According to the method for annealing metal parts according to the present invention, annealing in an annealing furnace, cooling in a cooling device, and plastic working in a metal working machine can be performed on a continuous production line by one transport means. As a result, work efficiency is improved, and production time and production cost can be reduced. In addition, by circulating the conveying means between the annealing furnace, the cooling device and the metal working machine, it is possible to make a nearly continuous production line until the final product is completed by simply changing the metal working machine die, and further improve productivity. Can be improved.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing one embodiment of an annealing furnace for metal parts according to the present invention.

FIG. 2 is a perspective view of an electric heating unit of the metal component annealing furnace shown in FIG.

FIG. 3 is a configuration diagram showing another embodiment of the method for energizing a metal component according to the present invention.

FIG. 4 is a configuration diagram showing another embodiment of the metal component energizing method according to the present invention.

FIG. 5 is a configuration diagram showing another embodiment of the method for energizing a metal component according to the present invention.

FIG. 6 is a process chart showing a process of plastic working of a metal part.

FIG. 7 is a configuration diagram showing an example of a conventional method for annealing metal parts.

FIG. 8 is a configuration diagram showing an example of a conventional method for annealing metal parts.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Annealing furnace 12 Furnace main body 14 Metal part 16 Transport means 18 Moving means 20 Electric heating means 22a, 22b Arm 28 Parts feeder 30a, 30b Claw part 32 Cooling device 34 Metal working machine 36a, 36b Moving means 38a, 38b Tip part 40a, 40b cylinder 42a, 42b rail 44a, 44b ball bearing 46a, 46b metal ball

Claims (9)

[Claims] 1. An annealing furnace for metal parts for annealing plastically processed metal parts, comprising: a furnace main body; conveying means for placing and passing the metal parts through the inside of the furnace main body; and being provided in the furnace main body. Having an anode and a cathode, and having an electric heating means for energizing and heating an object which comes into contact with the anode and the cathode. An annealing furnace for metal parts, characterized in that a current is heated by heating. 2. A moving means for moving in the furnace main body, wherein the energizing and heating means is attached to the moving means at regular intervals, and the moving means is moved at the same speed as the conveying means, so that the metal parts and 2. An annealing furnace for metal parts according to claim 1, wherein the contact with the electric heating means is maintained. 3. The method according to claim 1, wherein the moving means is sandwiched between the transfer means.
Attaching the anode of the displaceable energizing heating means to one of the moving means, and attaching the displaceable cathode of the energizing heating means to the other moving means, and moving the two moving means and the transport means at the same speed. 2. An annealing furnace according to claim 1, wherein the contact between the anode and the cathode and the metal part is maintained. 4. An annealing furnace for metal parts according to claim 2, wherein a contact area between the anode and the cathode, which is in contact with said metal parts, has a small area. 5. The electric heating means comprises a parallel anode and a cathode disposed at a predetermined interval above the transfer means, and a metal part placed on the transfer means contacts the anode and the cathode. The annealing furnace for metal parts according to claim 1, wherein the furnace moves while moving. 6. An annealing furnace according to claim 5, wherein said anode and said cathode are rails. 7. An annealing furnace for metal parts according to claim 5, wherein said anode and said cathode are two rows of ball bearings provided with a large number of metal balls. 8. A metal part is placed on a conveying means and passed through the inside of an annealing furnace, and the metal part is brought into contact with an electric heating means for energizing and heating an object in contact with an anode and a cathode inside the annealing furnace. The metal part is heated, and thereafter, the conveying means on which the metal part is placed is passed through a cooling device to cool the metal part, and thereafter, the conveying means on which the metal part is placed is passed through a metal working machine, and the metal part is cooled. A method for annealing metal parts, wherein plastic working is performed. 9. The method of annealing a metal part according to claim 8, wherein the conveying means passes through the inside of the annealing furnace again after passing through the metal working machine.