JPH0554537U - Vacuum quenching device - Google Patents

Abstract

(57) [Summary] [Purpose] The heat-treated product is uniformly cooled in each part to prevent distortion. [Structure] In a closed furnace body 1, a heating / cooling processing chamber 6 having a large number of cooling gas outlets on its peripheral wall is arranged. A heating element 13 is provided inside the heating / cooling processing chamber 6. Heating / cooling processing room 6
A heat treatment product mounting table 19 is provided therein so as to be vertically movable.

Description

[Detailed description of the device]

[0001]

[Industrial application]

 The present invention relates to a vacuum quenching apparatus used for heating a heat-treated product in a vacuum atmosphere and cooling it with an inert gas for quenching.

[0002]

[Prior Art]

 As this kind of vacuum quenching device, a closed furnace body, a vacuuming device and an inert gas supply device connected to the furnace body, a cooling gas outlet with a movable door, which is arranged in the furnace body, are formed. It is known that the heating and cooling processing chamber has a heating element inside, and a cooling gas cooler and a cooling gas circulation fan arranged in the furnace body.

In this vacuum quenching apparatus, after a heat-treated product such as a steel product is placed in the processing chamber, the inside of the furnace body is put into a vacuum state, the heat-treated body heats the heat-treated product in the processing chamber to a predetermined temperature, and then the furnace body. Is filled with a cooling gas consisting of an inert gas such as nitrogen gas at atmospheric pressure or higher, and the cooling gas circulation fan circulates the cooling gas inside and outside the heating / cooling processing chamber, and at the same time, the heat treatment product is passed through the cooling gas cooler. It is designed to be rapidly cooled to below the specified temperature.

[0004]

[Problems to be solved by the device]

 However, in the case of the conventional vacuum quenching equipment, the cooling gas is blown onto the heat-treated product from a fixed direction, so there are places where the cooling gas is less likely to hit the heat-treated product, and the heat-treated product cannot be cooled uniformly. However, there is a problem that distortion occurs.

An object of the present invention is to provide a vacuum hardening apparatus that solves the above problems.

[0006]

[Means for Solving the Problems]

 The vacuum quenching apparatus according to the present invention includes a hermetically sealed furnace body, a vacuum evacuation device connected to the furnace body, a cooling inert gas supply device, and a heating element provided inside the furnace body. It is equipped with a heating / cooling processing chamber that has many cooling gas outlets on its peripheral wall, a cooling gas cooler and a cooling gas circulation fan that are placed inside the furnace, and the cooling gas circulation fan allows the cooling gas to flow inside and outside the heating / cooling processing chamber. It is a vacuum quenching device that is circulated and is passed through a cooling gas cooler. A heat treatment product mounting table is vertically movable in the heating and cooling treatment chamber.

[0007]

[Action]

 When the heat treatment product mounting table is moved up and down during cooling, the position where the cooling gas hits the heat treatment product changes, so that the heat treatment product is uniformly cooled in each part thereof.

[0008]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. In the following description, the right side of FIG. 1 is referred to as the front and the left side is referred to as the rear. In addition, the left and right in Fig. 2 are referred to as the left and right.

The vacuum quenching apparatus according to the present invention comprises a closed furnace body (1), a vacuuming device and an inert gas supply device (both not shown) connected to the furnace body (1). There is. The furnace body (1) has a cylindrical main body (1a), an openable door (1b) that closes the rear end opening of the main body (1a), and a closing wall (fixed at the front end of the main body (1a) that closes the front end opening ( It consists of 1c).

On the inner peripheral surface of the main body (1a) of the furnace body (1), the inside of the furnace body (1) is divided into two front and rear compartments (2) and (3), and a cooling gas outlet (4a ) Is formed, and a partition wall (4) around which a plurality of cooling gas inlets (4b) are formed at predetermined intervals in the circumferential direction is fixed. The partition wall (4) is fitted with a cooling gas cooler (5) for cooling the cooling gas that flows through the cooling gas outlet (4a) from the rear compartment (3) into the front compartment (2). ing. The heating and cooling treatment chamber (6) is located in the rear compartment (3) of the furnace body (1), and the motor fixed to the front end closing wall (1c) of the furnace body (1) is located in the front compartment (2). A cooling gas circulation fan (7) operated by (8) is arranged.

A cooling gas discharge port (9) is formed in the front wall (6a) of the heating / cooling processing chamber (6) and is opened / closed by a movable door (10). On the other hand, a heat treatment product inlet / outlet port (11) is formed on the rear wall (6b) of the heating / cooling treatment chamber (6) and is opened / closed by a movable door (12). A plurality of heating elements (13) are arranged in the heating / cooling processing chamber (6).

A cooling gas inlet (4b) extending in the front-rear direction and having a front end opened and a rear end closed in a portion around the processing chamber (6) in the rear section (3) in the furnace body (1) The same number of tubular cooling gas ducts (14) are arranged at predetermined intervals in the circumferential direction. The front end of each cooling gas duct (14) is connected to the cooling gas inlet (4b) of the partition wall (4). On the peripheral wall of the cooling gas duct (14), a plurality of cooling gas blow-out pipes (15) whose tips are connected to the peripheral wall (6c) of the processing chamber (6) in a penetrating manner are provided at predetermined intervals in the front-rear direction. There is. The tip end opening of the cooling gas outlet pipe (15) serves as the cooling gas outlet.

A lower bulge (1d) is formed in the lower portion of the cylindrical body (1a) of the furnace body (1), and a vertical rod (16) is formed on the bottom wall of the lower bulge (1d). ) Is vertically movable and is hermetically penetrated. The rod (16) can be moved up and down by a known lifting drive device (not shown) provided outside the furnace body (1). A lifting platform (17) is attached to the upper end of the rod (16), and a plurality of columns (18) are erected on the upper end side by side in the front-rear and left-right directions. The column (18) penetrates the bottom wall of the processing chamber (6) so as to be vertically movable. The heat treatment product mounting table (19) is attached to the upper ends of the columns (18).

In such a configuration, after the heat treatment product (W) is placed in the heating / cooling treatment chamber (6) and placed on the heat treatment product placement table (19), the furnace body (1) is evacuated by a vacuuming device. The inside is brought into a vacuum state, and the heat-treated article (W) is heated to a predetermined temperature or higher by the heating element (13). At this time, the heat-treated product mounting table (19) is moved up and down via the rod (16), the lift (17) and the column (18) by the lifting drive device, so that the heat-treated product (W) is uniformly heated. It

Then, the heating by the heating element (13) is stopped, the movable door (10) is moved to open the cooling gas discharge port (9), and the inert gas supply device is used to inactivate nitrogen gas or the like. Cooling gas consisting of gas is supplied so that the pressure in the furnace body (1) becomes atmospheric pressure or higher. Then, the cooling gas circulation fan (7) sends the cooling gas into the cooling gas duct (14) through any one of the communication holes (19), (21) and (22) and the cooling gas inlet (4b) to cool the cooling gas. Blow into the heating and cooling treatment chamber (6) through the blow-out pipe (15). On the other hand, the cooling gas in the heating / cooling treatment chamber (6) is sucked through the cooling gas discharge port (9) and passed through the cooler (5) for cooling. By thus circulating the cooling gas in the furnace body (1), the heat-treated product (W) is cooled. At this time, if the heat-treating product placing table (19) is moved up and down via the rod (16), the elevating table (17) and the column (18) by the elevating and lowering device, the cooling gas of the heat-treating product (W) is Since the contact position changes, the heat-treated product (W) is uniformly cooled in each part. Therefore, it is possible to prevent distortion in the heat-treated product (W).

[0016]

[Effect of the device]

 According to the vacuum quenching apparatus of the present invention, the heat-treated product can be uniformly cooled in each part as described above, so that the heat-treated product can be prevented from being distorted.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a vacuum hardening apparatus according to the present invention.

FIG. 2 is a cross-sectional view of the same.

[Explanation of symbols]

 1 Closed furnace body 5 Cooling gas cooler 6 Heating / cooling processing chamber 7 Cooling gas circulation fan 15 Cooling gas blow-out pipe 19 Heat treatment product mounting table

Claims (1)

[Scope of utility model registration request] 1. A hermetically sealed furnace body, an evacuation device and a cooling inert gas supply device connected to the furnace body, a heating body disposed inside the furnace body, and a plurality of cooling members on a peripheral wall. A heating / cooling processing chamber having a gas outlet, a cooling gas cooler and a cooling gas circulation fan arranged in the furnace body are provided, and the cooling gas circulation fan circulates the cooling gas inside and outside the heating / cooling processing chamber. A vacuum quenching device that is adapted to be passed through a cooling gas cooler, in which a heat treatment product mounting table is vertically movable in a heating and cooling treatment chamber.