JP6810766B2 - Horizontal heat treatment equipment - Google Patents

Description

The present invention relates to a horizontal heat treatment apparatus configured to perform non-oxidation heat treatment on an elongated work arranged horizontally along the horizontal direction.

When it is necessary to increase the strength, toughness, etc. of metal workpieces that make up parts used in industrial products, the workpieces should be subjected to heat treatment such as quenching and tempering. There is. In particular, when the work is required to have high quality such as high shape accuracy and high dimensional accuracy, the work is subjected to non-oxidation heat treatment in order to prevent scale such as an oxide film from being generated on the work. In the non-oxidizing heat treatment, the work is heated by high-frequency induction heating or the like in a non-oxidizing atmosphere in which the oxygen concentration is extremely low by an inert gas such as nitrogen gas or argon gas, and then the work is cooled. It is cooled by the liquid.

Further, a work having an elongated shape such as a ball screw, that is, an elongated work may be subjected to non-oxidation heat treatment. Various heat treatment devices are used to perform non-oxidation heat treatment on such elongated workpieces. Such a heat treatment device typically heats the elongated work in a non-oxidizing atmosphere, transports the elongated work along its longitudinal direction, and then cools the high frequency induction heated portion of the elongated work with a coolant. It is configured to cool. A typical heat treatment device is a transport mechanism for transporting an elongated work, a heating mechanism for heating the elongated work, and a gas for supplying an inert gas so that the heating space for heating by the heating mechanism has an non-oxidizing atmosphere. It has a supply mechanism and a cooling mechanism that is located downstream of the heating mechanism in the transport direction of the elongated work and sprays a coolant onto the elongated work so as to cool the elongated work.

Further, such a heat treatment device includes a vertical heat treatment device configured to perform heat treatment on an elongated work arranged vertically along the vertical direction and horizontally placed along the horizontal direction. There is a horizontal heat treatment device configured to perform heat treatment on an elongated work arranged in. Of these, in the vertical heat treatment apparatus, since the cooling mechanism is arranged below the heating mechanism, the cooling liquid can be dropped by its own weight. Therefore, it is possible to prevent the cooling liquid sprayed by the cooling mechanism from heading to the heating space, and as a result, the problem that the cooling liquid invades the heating space is less likely to occur.

On the other hand, in the horizontal heat treatment device, the heating mechanism and the cooling mechanism are arranged in the horizontal direction. Therefore, the coolant sprayed by the cooling mechanism may move toward the heating space, and the cooling liquid may invade the heating space. This is a problem. Therefore, various horizontal heat treatment devices that can solve such a problem have been proposed. As an example of such a horizontal heat treatment device, a shield is arranged between a heating mechanism (coil) and a cooling mechanism (cooler), and the shield is compatible with the cross-sectional shape of an elongated work (hardened body). Examples thereof include induction hardening devices in which holes having complementary shapes are formed. (See, for example, Patent Document 1.)

Japanese Unexamined Patent Publication No. 4-289123

However, in the above example of the horizontal heat treatment device, it is necessary to provide a clearance between the peripheral edge of the hole of the shield and the elongated work in order to allow the elongated work to smoothly pass through the hole of the shield. Further, since it is difficult to completely seal the heating space, there may be a gap for communicating the space on the cooling mechanism side with the shield and the space on the heating mechanism side with the shield. Therefore, in the above-mentioned example of the horizontal heat treatment apparatus, there is a possibility that the cooling liquid sprayed by the cooling mechanism still invades the heating space due to such clearances, gaps, and the like.

Therefore, it is conceivable to provide an air blow mechanism that injects air so as to prevent the movement of the coolant between the heating mechanism and the cooling mechanism. However, when the air injected by the air blow hits the elongated work, there is an increased possibility that scale such as an oxide film is generated on the elongated work. That is, there is a possibility that the non-oxidizing heat treatment cannot be efficiently applied to the elongated work.

In view of these circumstances, in the horizontal heat treatment device, the non-oxidizing heat treatment is efficiently applied to the elongated work, and the coolant is efficiently prevented from entering the heating space where the heating mechanism heats. It is desirable to do.

In order to solve the above problems, the horizontal heat treatment apparatus according to one aspect transports the elongated work along the longitudinal axis of the elongated work in a state where the elongated work is arranged horizontally along the horizontal direction, and transfers the elongated work to the elongated work. A horizontal heat treatment device configured to perform non-oxidation heat treatment, the heating mechanism arranged around the outer peripheral surface of the elongated work and capable of heating the elongated work, and the elongated work. A first unit having an injection port configured to inject a coolant, arranged around the outer peripheral surface of the elongated work, and separated from the heating mechanism on the downstream side in the transport direction of the elongated work. And a second cooling mechanism, the first cooling mechanism is located between the heating mechanism and the second cooling mechanism in the transport direction, and the coolant injected from the injection port of the first cooling mechanism. The injection direction is orthogonal to the longitudinal axis and is inclined toward the second cooling mechanism with reference to the first virtual plane passing through the injection port, and there is a gap between the heating mechanism and the first cooling mechanism. It is formed, and a gap is formed between the first and second cooling mechanisms, each of the first and second cooling mechanisms is arranged so as to face the outer peripheral surface of the elongated work, and the injection port is provided. An upstream opening and a downstream opening located at the upstream end and the downstream end of the inner peripheral portion provided in the transport direction, respectively, and opening so that the elongated work can pass along the transport direction. It has an opening, and the size of the downstream opening of the first cooling mechanism is larger than the size of the upstream opening of the first cooling mechanism, and the coolant injected from the injection port of the first cooling mechanism The injection axis extending along the injection direction and passing through the injection port is configured to intersect the outer peripheral surface of the elongated work on the downstream side in the transport direction from the downstream opening of the first cooling mechanism .

In the horizontal heat treatment apparatus according to one aspect, the non-oxidizing heat treatment can be efficiently applied to the elongated work, and the coolant is efficiently prevented from entering the heating space to be heated by the heating mechanism. be able to.

FIG. 1 is a vertical cross-sectional view schematically showing a state in which a horizontal heat treatment apparatus according to an embodiment is cut in the vertical direction along a longitudinal axis of an elongated work. FIG. 2 is a front view schematically showing a state in which the first cooling mechanism of the horizontal heat treatment apparatus according to the embodiment is viewed from the downstream side to the upstream side in the transport direction of the elongated work. FIG. 3 is a front view schematically showing a second cooling mechanism of the horizontal heat treatment apparatus according to the embodiment as viewed in a direction from the downstream side to the upstream side in the transport direction of the elongated work.

The horizontal heat treatment apparatus according to the embodiment will be described below. The horizontal heat treatment apparatus according to the present embodiment is configured to perform non-oxidation heat treatment on an elongated work. The non-oxidizing heat treatment includes a non-oxidizing heating step of heating the elongated work in a substantially oxygen-free atmosphere and a cooling step of cooling the elongated work thus heated. Further, in the present embodiment, the non-oxidizing heat treatment includes non-oxidizing quenching, non-oxidizing tempering and the like.

"Outline of horizontal heat treatment equipment"
The outline of the horizontal heat treatment apparatus according to this embodiment will be described. As shown in FIG. 1, the horizontal heat treatment device (hereinafter, simply referred to as “device” if necessary) heats the elongated work W (shown by virtual lines in FIGS. 1 to 3) without oxidation as described above. It is configured to perform processing. Then, the apparatus is configured to convey the elongated work W along the longitudinal axis w1 in a state where the elongated work W is arranged horizontally along the substantially horizontal direction.

In FIGS. 1 to 3, the upper side of the device is indicated by an arrow U, and the lower side of the device is indicated by an arrow D. Further, in FIG. 1, the upstream side in the transport direction for transporting the elongated work W is indicated by an arrow F1, and the downstream side in the transport direction is indicated by an arrow F2.

Further, in the present embodiment, the elongated work W is a ball screw. Although not clearly shown, a spiral thread groove is formed on the outer peripheral surface w2 of the elongated work W which is a ball screw. However, the elongated work is not limited to the ball screw. The elongated work may be an article formed in an elongated shape. For example, the elongated work may be a linear motion rail, a shaft, or the like.

As shown in FIG. 1, such an apparatus has a heating mechanism 1 configured to be able to heat an elongated work W. The heating mechanism 1 is arranged around the outer peripheral surface w2 of the elongated work W so as to partially or wholly surround the outer peripheral surface w2 of the elongated work W. The device also has a first cooling mechanism 2 and a second cooling mechanism 3 configured to be able to cool the elongated work W. Each of the first and second cooling mechanisms 2 and 3 has a plurality of injection ports 21 and 31 configured to inject the coolants C1 and C2 onto the elongated work W. However, at least one of the first and second cooling mechanisms can be configured to have one injection port.

Each of the first and second cooling mechanisms 2 and 3 is arranged around the outer peripheral surface w2 of the elongated work W so as to partially or wholly surround the outer peripheral surface w2 of the elongated work W. Each of the first and second cooling mechanisms 2 and 3 is also separated from the heating mechanism 1 on the downstream side in the transport direction of the elongated work W. Further, the first cooling mechanism 2 is located between the heating mechanism 1 and the second cooling mechanism 3 in the transport direction.

The first injection direction of the coolant C1 injected from each injection port 21 of the first cooling mechanism 2 is substantially orthogonal to the longitudinal axis w1 and the second cooling is based on the first virtual plane passing through the injection port 21. It is inclined toward the mechanism 3. The first injection direction is oriented along the first injection axis L1 that passes through each injection port 21 of the first cooling mechanism 2 and extends in the penetrating direction of the injection port 21. Further, a first gap P1 is formed between the heating mechanism 1 and the first cooling mechanism 2. A second gap P2 is also formed between the first and second cooling mechanisms 2 and 3.

Further, the outline of the horizontal heat treatment apparatus may be as follows. As shown in FIG. 1, the second injection direction of the coolant C2 injected from each injection port 31 of the second cooling mechanism 3 is substantially orthogonal to the longitudinal axis w1 and the second virtual passage through the injection port 31. Along the plane. The second injection direction is oriented along the second injection axis L2 that passes through each injection port 31 of the second cooling mechanism 3 and extends in the penetrating direction of the injection port 31.

Referring to FIGS. 1 to 3, each of the first and second cooling mechanisms 2 and 3 has an inner peripheral portion 22 and 32 arranged so as to face the outer peripheral surface w2 of the elongated work W, and the inner peripheral portion 22. , 32 have upstream openings 23, 33 and downstream openings 24, 34 located at the upstream end and the downstream end, respectively, in the transport direction. The inner peripheral portion 22 of the first cooling mechanism 2 is provided with the injection port 21 of the first cooling mechanism 2, and the inner peripheral portion 32 of the second cooling mechanism 3 is provided with the injection port 31 of the second cooling mechanism 3. ..

As shown in FIG. 1, the upstream and downstream openings 23 and 24 of the first cooling mechanism 2 and the upstream and downstream openings 33 and 34 of the second cooling mechanism 3 allow the elongated work W to pass along the transport direction. Open like this. The size of the downstream opening 24 of the first cooling mechanism 2 is larger than the size of the upstream opening 23 of the first cooling mechanism 2. The first injection axis L1 extending along the first injection direction of the coolant C1 injected from each injection port 21 of the first cooling mechanism 2 and passing through the injection port 21 is a downstream opening 24 of the first cooling mechanism 2. It intersects with the outer peripheral surface w2 of the elongated work W on the downstream side in the transport direction.

"Details of horizontal heat treatment equipment"
The horizontal heat treatment device may be configured as follows in detail. Although not specifically shown, the apparatus has a transport mechanism configured to rotate the elongated work W along its longitudinal axis w1 and transport it along its longitudinal axis w1. For example, the transfer mechanism can be configured to have a plurality of rollers for enabling the elongated work W to be conveyed in this way. However, the configuration of the transport mechanism is not limited to these.

As shown in FIG. 1, the apparatus has a gas supply mechanism 4 configured to be able to supply the inert gas G. The gas supply mechanism 4 is configured so that the heating mechanism 1 can supply the inert gas G to the heating space H for heating the elongated work W. The gas supply mechanism 4 includes a gas supply pipe 41 having a tip portion 41a for flowing out the inert gas G.

The gas supply mechanism 4 can fill the heating space H with an inert gas G so as to reduce the oxygen concentration in the heating space H in order to make the heating space H a substantially non-oxidizing atmosphere. ing. The inert gas G can be nitrogen gas, argon gas, helium gas or the like. However, the inert gas is not limited to this.

The lengths of the first and second gaps P1 and P2 in the transport direction are set so that the coolants C1 and C2 can smoothly pass through the first and second gaps P1 and P2, respectively. Further, in FIG. 1, the lengths of the first and second gaps P1 and P2 in the transport direction are substantially the same. However, the length of the first gap in the transport direction can be made larger or smaller than the length of the second gap in the transport direction.

"Details of heating mechanism"
With reference to FIG. 1, the heating mechanism 1 may be as follows in detail. The heating mechanism 1 has a heating coil 11 configured to enable induction heating of the elongated work W. Further, the heating coil 11 may be configured to enable high frequency induction heating of the elongated work W.

The heating coil 11 has a coil body 11a arranged around the outer peripheral surface w2 of the elongated work W. The heating mechanism 1, particularly the coil body 11a of the heating coil 11, is arranged so as to be spaced from the outer peripheral surface w2 of the elongated work W. A through hole 11b is formed in the coil body 11a so that the elongated work W can pass through. When an electric current is passed through the heating coil 11, the coil body 11a of the heating coil 11 induces and heats the elongated work W passing through the through hole 11b.

The heating mechanism 1 has a housing 12 configured to surround the heating coil 11. The internal space of the housing 12 is the heating space H described above. The housing 12 is configured so that the internal space of the housing 12 can be made a substantially closed space in order to make the internal space a substantially non-oxidizing atmosphere.

The housing 12 has an upstream passage port 12a and a downstream passage port 12b formed on the upstream side and the downstream side of the housing 12 in the transport direction, respectively, so that the elongated work W can pass along the transport direction. The upstream and downstream passage ports 12a and 12b of the housing 12 of the heating mechanism 1, the upstream and downstream openings 23 and 24 of the first cooling mechanism 2, and the upstream and downstream openings 33 and 34 of the second cooling mechanism 3 Are lined up along the longitudinal axis w1 of the elongated work W. The housing 12 also has a gas inflow port 12c formed so that the inert gas G supplied from the gas supply mechanism 4 can flow into the internal space of the housing 12.

The tip 41a of the gas supply pipe 41 is connected to the gas inflow port 12c. The inert gas G is supplied from the tip portion 41a to the internal space of the housing 12 through the gas inflow port 12c. The first gap P1 is formed between the housing 12 of the heating mechanism 1 and the first cooling mechanism 2.

"Details of the first and second cooling mechanisms"
The first and second cooling mechanisms 2 and 3 may be described in detail as follows. As for the details of the first cooling mechanism 2, as shown in FIGS. 1 and 2, the inner peripheral portion 22 of the first cooling mechanism 2 is arranged so as to be spaced from the outer peripheral surface w2 of the elongated work W. As described above, the first injection direction of the coolant C1 of the first cooling mechanism 2 is inclined toward the second cooling mechanism 3 with respect to the first virtual plane, and is further toward the longitudinal axis w1 of the elongated work W. .. The coolant C1 injected from each injection port 21 of the first cooling mechanism 2 is adapted to hit the outer peripheral surface w2 of the elongated work W on the downstream side in the transport direction from the downstream opening 24 of the first cooling mechanism 2.

The inner peripheral portion 22 of the first cooling mechanism 2 is inclined so as to be separated from the longitudinal axis w1 from the upstream to the downstream in the transport direction. For example, the inner peripheral portion 22 can be formed so as to form a substantially truncated cone-shaped space on the inner peripheral side thereof.

As for the details of the second cooling mechanism 3, as shown in FIGS. 1 and 3, the inner peripheral portion 32 of the second cooling mechanism 3 is arranged so as to be spaced from the outer peripheral surface w2 of the elongated work W. The second injection direction of the coolant C2 of the second cooling mechanism 3 is along the second virtual plane as described above, and further toward the longitudinal axis w1 of the elongated work W. The inner peripheral portion 32 of the second cooling mechanism 3 extends substantially linearly from the upstream side to the downstream side in the transport direction. For example, the inner peripheral portion 32 can be formed so as to form a substantially cylindrical space on the inner peripheral side thereof.

The second cooling mechanism 3 has an outer peripheral portion 35 located so as to face the inner peripheral portion 32 thereof. The second cooling mechanism 3 has a lower penetrating portion 36 penetrating between the inner peripheral portion 32 and the outer peripheral portion 35 along the downward direction from the longitudinal axis w1 of the elongated work W. The lower penetrating portion 36 opens in the transport direction at the upstream end of the second cooling mechanism 3 in the transport direction. Further, the lower penetrating portion 36 may be opened in the transport direction at the downstream end of the second cooling mechanism 3 in the transport direction.

Regarding the relationship between the first and second cooling mechanisms 2 and 3, the size of the upstream opening 33 of the second cooling mechanism 3 is substantially equal to the size of the downstream opening 24 of the first cooling mechanism 2. The upstream opening 33 of the second cooling mechanism 3 may be formed so as to correspond to the downstream opening 24 of the first cooling mechanism 2. However, the upstream opening of the second cooling mechanism can be made larger or smaller than the downstream opening of the first cooling mechanism.

The coolants C1 and C2 of the first and second cooling mechanisms 2 and 3 are liquids capable of cooling the elongated work W. The coolants C1 and C2 of the first and second cooling mechanisms 2 and 3 may also be liquids that do not promote the oxidation of the elongated work W. The coolants C1 and C2 of the first and second cooling mechanisms 2 and 3 are of the same type. The coolants C1 and C2 of the first and second cooling mechanisms 2 and 3 can be assumed to have been supplied from the same source. The coolants C1 and C2 of the first and second cooling mechanisms 2 and 3 are preferably hardened liquids composed of water and an anti-quenching agent. For example, the concentration of the quench cracking inhibitor in the quenching liquid can be about 6%.

However, the coolants of the first and second cooling mechanisms are not limited thereto. The coolants of the first and second cooling mechanisms may be of different types. The coolants of the first and second cooling mechanisms may be supplied from different sources. At least one of the cooling liquids of the first and second cooling mechanisms may be other than the quenching liquid. Further, the concentration of the quench cracking inhibitor in the quenching liquid may be other than about 6%.

As shown in FIG. 1, the length of the second injection range in which the plurality of injection ports 31 are arranged by the second cooling mechanism 3 in the transport direction is such that the plurality of injection ports 21 are arranged by the first cooling mechanism 2. It is longer than the length of one injection range in the transport direction. The second flow rate of the coolant C2 injected by each injection port 31 of the second cooling mechanism 3 is larger than the first flow rate of the coolant C1 injected by each injection port 21 of the first cooling mechanism 2. .. The second total flow rate of the coolant C2 injected by the plurality of injection ports 31 of the second cooling mechanism 3 is larger than the first total flow rate of the coolant C1 injected by the plurality of injection ports 21 of the first cooling mechanism 2. It's getting bigger.

However, the length of the second injection range in the second cooling mechanism in the transport direction may be equal to or less than the length of the first injection range in the first cooling mechanism in the transport direction. The second flow rate of the coolant of the second cooling mechanism may be equal to or less than the first flow rate of the coolant of the first cooling mechanism. The second total flow rate of the coolant of the second cooling mechanism may be equal to or less than the first total flow rate of the coolant of the first cooling mechanism.

"Oxidation-free heat treatment method"
An example of the non-oxidation heat treatment method in the horizontal heat treatment apparatus according to the present embodiment will be described with reference to FIG. In the non-oxidizing heat treatment method, the slender work W arranged horizontally along the horizontal direction is subjected to the non-oxidizing heat treatment. In such a non-oxidizing heat treatment method, the elongated work W is heated by the heating mechanism 1 (heating step). In this heating step, the heating space H for heating the elongated work W by the heating mechanism 1 is made into a substantially non-oxidizing atmosphere by the inert gas G supplied from the gas supply mechanism 4.

Next, the elongated work W heated in the heating step is conveyed from the upstream side to the downstream side in the conveying direction by a conveying mechanism (not shown), and the conveyed elongated work W is the first and first. 2 It is cooled by the coolants C1 and C2 sprayed from the injection ports 21 and 31 of the cooling mechanisms 2 and 3 (cooling step). In this cooling step, the first injection direction of the coolant C1 of the first cooling mechanism 2 is inclined toward the second cooling mechanism 3 in the transport direction with reference to the vertical axis intersecting the longitudinal axis w1 substantially perpendicularly. Further, in the cooling step, the coolants C1 and C2 ejected from the injection ports 21 and 31 of the first or second cooling mechanisms 2 and 3 form the first gap P1 between the heating mechanism 1 and the first cooling mechanism 2. It passes through at least one of the second gaps P2 between the first and second cooling mechanisms 2 and 3. Through such a heating step and a cooling step, the elongated work W is heat-treated without oxidation.

As described above, in the horizontal heat treatment apparatus according to the present embodiment, the first cooling mechanism 2 is located between the heating mechanism 1 and the second cooling mechanism 3 in the transport direction, and is injected from the injection port 21 of the first cooling mechanism 2. The first injection direction of the coolant C1 is substantially orthogonal to the longitudinal axis w1 of the elongated work W, and is inclined toward the second cooling mechanism 3 with reference to the first virtual plane passing through the injection port 21. A first gap P1 is formed between the heating mechanism 1 and the first cooling mechanism 2, and a second gap P2 is formed between the first and second cooling mechanisms 2 and 3.

Therefore, the coolant C1 of the first cooling mechanism 2 is injected along the first injection direction inclined toward the second cooling mechanism 3, whereby the coolant C2 of the second cooling mechanism 3 is subjected to such first. Together with the coolant C1 of the cooling mechanism 2, it is urged to move away from the heating space H. Further, the first gap P1 can separate the heating space H from the region where the coolants C1 and C2 are sprayed, and can efficiently prevent the coolants C1 and C2 from entering the heating space H. The first and second gaps P1 and P2 can efficiently discharge the coolants C1 and C2 after being sprayed from the first and second cooling mechanisms 2 and 3. Therefore, it is possible to efficiently prevent the coolants C1 and C2 from entering the heating space H. Such a configuration in which the cooling liquids C1 and C2 of the first and second cooling mechanisms 2 and 3 prevent the cooling liquids C1 and C2 from entering the heating space H is, for example, a configuration in which the cooling liquids enter the heating space by air blowing or the like. Compared with the configuration for preventing intrusion, it is possible to efficiently prevent the formation of scale such as an oxide film on the elongated work W. In addition, the elongated work W can be efficiently cooled by the two cooling mechanisms 2 and 3, that is, the coolants C1 and C2 of the first and second cooling mechanisms 2 and 3. Therefore, the non-oxidizing heat treatment can be efficiently applied to the elongated work W.

In the horizontal heat treatment apparatus according to the present embodiment, the second injection direction of the coolant C2 injected from the injection port 31 of the second cooling mechanism 3 is substantially orthogonal to the longitudinal axis w1 of the elongated work W, and this It is along a second virtual plane passing through the injection port 31. Therefore, the coolant C2 of the second cooling mechanism 3 can be efficiently applied to the elongated work W. In particular, when the elongated work W is a ball screw, the coolant C2 of the second cooling mechanism 3 can be efficiently applied to the screw groove of the ball screw.

In the horizontal heat treatment apparatus according to the present embodiment, the size of the downstream opening 24 of the first cooling mechanism 2 is larger than the size of the upstream opening 23. Therefore, it is possible to efficiently prevent the coolant C1 of the first cooling mechanism 2 from moving toward the heating space H.

In the horizontal heat treatment apparatus according to the present embodiment, the first injection axis L1 extending along the injection direction of the coolant C1 injected from the injection port 21 of the first cooling mechanism 2 and passing through the injection port 21 It intersects with the outer peripheral surface w2 of the elongated work W on the downstream side in the transport direction from the downstream opening 24 of the first cooling mechanism 2. Therefore, the coolant C1 after being sprayed from the first cooling mechanism 2 can be efficiently guided to the second gap P2 between the first and second cooling mechanisms 2 and 3.

Although the embodiments of the present invention have been described so far, the present invention is not limited to the above-described embodiments, and the present invention can be modified and modified based on the technical idea thereof.

1 ... Heating mechanism 2 ... First cooling mechanism, 21 ... Injection port, 22 ... Inner circumference, 23 ... Upstream opening, 24 ... Downstream opening 3 ... Second cooling mechanism, 31 ... Injection port, 32 ... Inner circumference, 33 ... upstream opening C1, C2 ... coolant, P1 ... first gap, P2 ... second gap, L1 ... first injection axis W ... elongated work, w1 ... longitudinal axis, w2 ... outer peripheral surface

Claims (2)

A horizontal heat treatment apparatus configured to transport an elongated work along the longitudinal axis of the elongated work in a state of being arranged horizontally along the horizontal direction, and to perform an oxidation-free heat treatment on the elongated work. ,
A heating mechanism arranged around the outer peripheral surface of the elongated work and capable of heating the elongated work,
It has an injection port configured to inject coolant onto the elongated work, is arranged around the outer peripheral surface of the elongated work, and is separated from the heating mechanism on the downstream side in the transport direction of the elongated work. Equipped with the first and second cooling mechanisms
The first cooling mechanism is located between the heating mechanism and the second cooling mechanism in the transport direction.
The injection direction of the coolant injected from the injection port of the first cooling mechanism is orthogonal to the longitudinal axis and is inclined toward the second cooling mechanism with reference to the first virtual plane passing through the injection port. Orthogonal
A gap is formed between the heating mechanism and the first cooling mechanism.
A gap is formed between the first and second cooling mechanisms .
Each of the first and second cooling mechanisms is arranged so as to face the outer peripheral surface of the elongated work, and the inner peripheral portion provided with the injection port, and the upstream end and downstream of the inner peripheral portion in the transport direction. It has an upstream opening and a downstream opening that are located at the side ends and that allow the elongated work to pass along the transport direction.
The size of the downstream opening of the first cooling mechanism is larger than the size of the upstream opening of the first cooling mechanism.
The injection axis extending along the injection direction of the coolant injected from the injection port of the first cooling mechanism and passing through the injection port is said to be downstream of the downstream opening of the first cooling mechanism in the transport direction. A horizontal heat treatment device that is configured to intersect the outer peripheral surface of an elongated work. The horizontal heating according to claim 1, wherein the injection direction of the coolant injected from the injection port of the second cooling mechanism is orthogonal to the longitudinal axis and is along the second virtual plane passing through the injection port. Processing equipment.