JPS6096724A - Shaft hardening apparatus - Google Patents

Abstract

PURPOSE:To obtain a uniform hardened layer by preventing the bending of a shaft after hardening, by providing a fluidized layer heating furnace apparatus for heating the shaft by inserting the same into the fluidized layer to enable the uniform heating of the shaft. CONSTITUTION:A hardening apparatus of a shaft 3 is constituted of a fluidized layer heating furnace apparatus 1 having a plurality of heating furnaces 2 arranged thereto, a hardening machine 13 for hardening the shaft 3 subjected to heat treatment in said apparatus 1 and a conveyor apparatus 15. Each of the aforementioned heating furnace heats the shaft 3 in such a way that the shaft 3 is inserted into the fluidized layer comprising fluidized particles and combustible gas blown into the above-mentioned fluidized layer is burnt. In addition, the above-mentioned conveyor apparatus 15 conveys the shaft 3 into the furnace 2 from a stock position and conveys the heated shaft 3 to the hardening machine 13 from the furnace 2. By the above-mentioned apparatus, the bending of the shaft 3 after hardening is prevented and a uniform hardened layer is obtained.

Description

[Detailed description of the invention] The present invention relates to a shaft hardening device.

Conventionally, when hardening shafts having a length of 1 rIL or more, rolling press hardening is performed to reduce hardening distortion. In order to minimize quenching distortion, it is important to heat uniformly so that the temperature distribution of the shaft immediately before quenching is uniform, to cool uniformly, and to have good press accuracy. When the length of the shaft exceeds lyx, it becomes difficult to uniformly heat the shaft when heated by high frequency. Additionally, electric, gas, or gas furnaces require larger furnaces, increasing equipment costs and installation space.

The present invention has been made in view of the above circumstances, and its purpose is to not only uniformly heat the shaft, but also to heat the shaft faster than conventional devices, to prevent the shaft from bending after hardening, and to It is an object of the present invention to provide a shaft hardening device that not only can obtain a uniform hardened layer but also can reduce the furnace size.

Hereinafter, the present invention will be explained with reference to the drawings. In the drawing, 1 is a fluidized bed heating furnace device, and this fluidized bed heating furnace device 1 is equipped with a plurality of heating furnaces 2. The heating furnaces 2 consist of two large furnaces and eight small furnaces. The furnace can be selected depending on the length of the shaft 3 that is the material to be treated. Inside the heating furnace 2, there is a layer of fluidized particles on a dispersion plate, and the material to be treated is inserted into this fluidized bed, and combustible gas is blown into the fluidized bed, and air is sent from below through the dispersion plate to create a fluidized bed. The burner inside burns combustible gas and heats the material to be treated.

Therefore, the air pipe 4 for blowing air, the supply pipe 5 for supplying combustible gas, the exhaust pipe 6, and the surrounding air pipe 7 are connected to each heating furnace 2.

Each heating furnace 2 is provided with a lid 8. The lid body 8 is the furnace body 9
The lid body 8 is opened and closed by the operation of an operating cylinder 11 which is connected to the furnace body 9 and the parallel link 10 through a parallel link 10.

A stock conveyor 12 is installed on one side of the fluidized bed heating furnace device 1.
are arranged, and on the other side of the fluidized bed heating furnace device 1 there is a quenching machine I3 with a rolling spray set and a quenching machine conveying device 1.
4 is arranged.

A conveying device 15 is arranged above the fluidized bed heating furnace device 1 . The conveyance device 15 includes a rail 16 arranged from above the stock conveyor 12 to above the hardening machine 13, and a gripping device 17 is provided on this rail 16 so as to be able to move by itself.

The shaft 3, which is the material to be processed, on the stock conveyor 12 is then gripped by the gripping device 17 of the conveyance device 15 and sent to the heating furnace 2. In this case, the heating furnace 2 is selected depending on the length of the shaft 3 which is the material to be treated. In this respect, energy-saving operation is possible.

After the shaft 3 is heated to a predetermined temperature by bright or non-oxidizing heating, it is conveyed from the heating furnace 2 to the hardening machine 13 by the gripping device 17 of the conveying device 15 and hardened by rolling spray.

After quenching, the quenching machine is transported out of the machine by the quenching machine transport device 14.

After hardening, shaft 3 has a diameter of 90φ and a length of 1.5m.
After press quenching, a total bending ffi (TIR) of 0.1 to 0.2771 m can be obtained.

As described in detail above, the present invention includes a heating furnace 2 in which a shaft, which is a material to be treated, is inserted into a fluidized bed made of fluidized particles, and the combustible gas blown into the fluidized bed is burned to heat the shaft 3. A plurality of fluidized bed heating furnace devices 1 are installed, a hardening machine 13 hardens the shaft 3 that has been heat-treated in the fluidized bed heating furnace device 1, and a hardening machine 13 that hardens the shaft 3 in a stock position and carries it into the heating furnace 2 and heat-treated the shaft 3. A transport bag that transports the shaft 3 from the heating furnace 2 to the hardening machine 13! +5.

Therefore, in order to heat the shaft 3, which is the material to be treated, in the fluidized bed heating furnace device I, it is possible to uniformly heat the shaft 3, and the heating rate can be approximately twice that of a normal electric furnace or gas furnace. As a result, the furnace size becomes smaller and the shaft 3
It is possible to prevent bending after quenching and to obtain a uniform hardened layer.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of the configuration of an embodiment of the present invention, FIG. 2 is a plan view of a fluidized bed heating furnace apparatus, and FIG. 3 is a side view of the same. 1 is a fluidized bed heating furnace device, 13 is a hardening machine, and 15 is a conveying device. Applicant: Komatsu Ltd. Representative: Masaaki Yonehara, Patent Attorney Tadashi Hamamoto, Patent Attorney

Claims (1)

[Claims] A fluidized bed heating furnace device 1 includes a plurality of heating furnaces 2 for inserting a shaft, which is a material to be treated, into a fluidized bed made of fluidized particles and heating the shaft 3 by burning combustible gas blown into the fluidized bed. , quenching 1fA13 for quenching the shaft 3 that has been heat treated in the fluidized bed heating furnace device 1, and transporting the shaft 3 from the stock position to the heating furnace 2 and transferring the heat treated shaft 3 from the heating furnace 2 to the quenching machine. 13;