JP2019214768A - Vacuum carburization apparatus - Google Patents

Abstract

To provide a quenching device and a quenching method, capable of operating a proper cooling condition by grasping accurately a flow velocity of a quenching oil regardless of the state of the quenching oil during a quenching treatment.SOLUTION: A vacuum carburization apparatus 1 includes a carburization chamber 2 for performing a carburization treatment to a carburization object W under a reduced-pressure atmosphere, a quenching tank 3 for performing a quenching treatment by using an oil 9 after performing the carburization treatment to the carburization object W, and an intermediate chamber 4 adjacent to the carburization chamber 2 and the quenching tank 3. In the vacuum carburization apparatus 1, a heat shielding material 10 for shielding heat generated from the carburization object W is installed in the intermediate chamber 4.SELECTED DRAWING: Figure 1

Description

The present invention relates to a vacuum carburizing apparatus for carburizing an object to be treated in a reduced-pressure atmosphere and thereafter performing a quenching treatment.

In order to increase the strength of a mechanical component represented by an automobile component, the so-called oil quenching, in which the mechanical component is carburized and then immersed in a quenching tank filled with a coolant such as quenching oil, is performed.

In a cooling step after a mechanical part is subjected to a high temperature treatment such as a carburizing treatment, there is a problem that a large distortion such as a bending is generated in the mechanical part due to rapid cooling of the mechanical part. In order to solve such a problem, for example, in Patent Document 1, a steel radiating radiator plate is installed on the heating zone side of a cooling chamber of a roller hearth furnace, so that bending generated when cooling a long material such as a bar material is provided. Is disclosed.

Further, in the heat treatment apparatus disclosed in Patent Document 2, after the material to be carburized is carried out, a heating heater is provided in a holding chamber in the middle of being conveyed to a cooling chamber such as an oil tank or a water tank. It is described that since the processing material can be kept heated, the temperature of the processing material can be prevented from lowering.

Japanese Utility Model Laid-Open No. 4-100243 JP-A-6-174377

However, since the steel radiation radiator installed in the apparatus disclosed in Patent Document 1 is heavy, in order to apply it to a vacuum carburizing apparatus having a quenching tank filled with oil, it must be placed horizontally. There is a restriction on the installation form, such as doing. Further, when the heater is installed in the vacuum carburizing apparatus as in the heat treatment apparatus of Patent Document 2, there is a problem that the amount of electricity required becomes excessively large in combination with the use of the heater in the carburizing chamber.

In view of the above, an object of the present invention is to provide a vacuum carburizing apparatus capable of easily and easily lowering the temperature of an object to be treated which has been subjected to high temperature treatment (carburizing treatment).

In order to solve the above-mentioned problems, the present invention provides a carburizing chamber for performing carburizing treatment on a workpiece under reduced pressure atmosphere, and a quenching tank for performing quenching using oil after carburizing the workpiece. And an intermediate chamber adjacent to the carburizing chamber and the quenching tank, wherein the intermediate chamber is a vacuum carburizing apparatus in which a heat shielding material for shielding heat generated from the object is installed.

This heat shielding material is composed of at least three or more layers of heat shielding material. Further, the heat shielding material has a structure for sealing at least the heat shielding materials on one end side.

The vacuum carburizing apparatus according to the present invention includes a heat shield that shields heat generated from the workpiece in an intermediate chamber between a carburizing chamber for carburizing the workpiece and a quenching tank for quenching the workpiece. Since the material is installed, an effect is obtained that oil quenching can be performed easily and easily without excessively lowering the temperature of the workpiece after the carburizing process as compared with the case where a heat radiation plate or a heater is provided.

It is a schematic cross section of the vacuum carburizing apparatus 1 of this invention. It is XX sectional drawing of the vacuum carburizing apparatus 1 shown in FIG. FIG. 3 is a sectional view taken along line AA of the vacuum carburizing apparatus 1 shown in FIG. 2.

An example of an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a schematic sectional view of a vacuum carburizing apparatus 1 as an example of an embodiment of the present invention (a sectional view taken along line YY of the vacuum carburizing apparatus 1 shown in FIG. 2), and FIG. FIG. 2 is a sectional view taken along the line, and FIG. 3 is a sectional view taken along the line AA of the vacuum carburizing apparatus 1 shown in FIG.

As shown in FIGS. 1 to 3, a vacuum carburizing apparatus 1 of the present invention includes a carburizing chamber 2 for performing carburizing treatment on a workpiece W under a reduced-pressure atmosphere, similarly to an existing vacuum carburizing apparatus, A quenching tank 3 in which quenching treatment is performed using oil 9 after carburizing treatment, and an intermediate chamber 4 adjacent to the carburizing chamber 2 and the quenching tank 3 are provided.

The carburizing chamber 2 and the intermediate chamber 4 are spaces for processing an object to be processed in a state where the inside is depressurized using a vacuum pump or the like (not shown). A partition door 5 is provided between the carburizing chamber 2 and the intermediate chamber 4, as shown in FIGS. The partition door 5 has a role of completely shutting off the carburizing gas used in the carburizing process and the high-temperature atmosphere when the plurality of heating parts 6 and 6 are heated between the carburizing chamber 2 and the intermediate chamber 4.

The quenching tank 3 is installed below the intermediate chamber 4 and is always filled with oil 9. The quenching tank 3 moves the workpiece W, which has been carburized in the carburizing chamber 2, from the carburizing chamber 2 to the intermediate chamber 4, and then immerses the workpiece W in the quenching tank 3, thereby obtaining oil. Has the role of performing quenching. The movement of the workpiece W between the intermediate chamber 4 and the carburizing chamber 2 and the movement of the workpiece W between the intermediate chamber 4 and the quenching tank 3 are performed by moving the elevator 7 installed in the intermediate chamber 4 in the vertical direction. By moving the workpiece W in the depth direction, the workpiece W can be transported freely.

As shown in FIGS. 2 and 3, by opening and closing the front door 8 provided on the front side of the vacuum carburizing apparatus 1, the workpiece W can be carried in and out of the vacuum carburizing apparatus 1 (the inside of the intermediate chamber 4). . Also, in the intermediate chamber 4, as shown in FIGS. 1 and 3, heat shielding members 10 for shielding heat generated from the processing object W are installed on both left and right sides (as viewed from the front as shown in FIG. 1). .

When the workpiece W after the carburizing process in the carburizing chamber 2 is moved to the intermediate chamber 4, a large amount of heat is released from the workpiece W. The heat shielding material 10 keeps the heat released from the processing object W in the intermediate chamber 4 as much as possible, and reflects the heat released from the processing object W (heat reflection) to thereby form the heat shielding material 10 in the quenching tank 3. Until the quenching process is performed, there is a function of suppressing a decrease in the temperature of the workpiece W.

The heat shielding material 10 is composed of at least three or more layers of shielding material, and at least one end (lower end) of the shielding material is sealed (sealed). As the heat shielding material, for example, a material such as quartz or ceramic fiber can be appropriately selected.

DESCRIPTION OF SYMBOLS 1 Vacuum carburizing apparatus 2 Carburizing chamber 3 Quenching tank 4 Intermediate chamber 5 Partition door 6 Heating parts 7 Elevator 8 Front door 9 Quenching oil 10 Heat shielding material W Workpiece (work)

Claims (3)

Carburizing chamber for performing carburizing treatment on the workpiece under reduced pressure atmosphere, quenching tank for performing quenching treatment using oil after carburizing the workpiece, and the carburizing chamber and the quenching tank A vacuum carburizing apparatus comprising:
A vacuum carburizing apparatus, wherein a heat shielding material for shielding heat generated from the processing object is installed in the intermediate chamber. The vacuum carburizing apparatus according to claim 1, wherein the heat shielding material is made of at least three layers of heat shielding material. 3. The vacuum carburizing apparatus according to claim 2, wherein at least one of the heat shielding materials of the heat shielding material is sealed.

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