KR102499088B1 - Rotational spray nozzle apparatus for improving cooling rate during heat treatment - Google Patents

Abstract

), 분사 각도(β), 노즐 각도(γ), 자유공간의 높이(h) 및 폭(w), 노즐의 개수(n), 분무범위의 중첩 길이(d) 등을 최적화 하여 냉각성능을 향상시켜 나노석출물을 균일하게 분포시킴으로써 고전기전도 및 고강도를 동시에 충족하는 동합금을 용이하게 제조할 수 있는 냉각환경이 안정적으로 제공할 수 있는 장점이 있다.Since cooling is performed in a chamber of limited space (cylindrical, rectangular), the rotary spray nozzle according to the present invention can increase cooling efficiency compared to the case of cooling in an open space, and the inclination (δ) in the cooling chamber can be increased. After cooling, the cooling medium (water or gas) can be quickly discharged, and the cooling performance can be improved by quickly removing bubbles generated by using a rotating spray nozzle.
In the rotary spray nozzle, since the cooling medium overlaps (d) and collides with the surface of the object to be cooled from the spraying position of the cooling water, the spray pressure of the cooling water can be effectively transmitted, the spray angle can be easily adjusted, and a wide spray angle can be formed. advantageous to do
In addition, the diameter of the spray nozzle (

), spray angle (β), nozzle angle (γ), height (h) and width (w) of free space, number of nozzles (n), overlapping length of spray range (d), etc. are optimized to improve cooling performance. There is an advantage in stably providing a cooling environment capable of easily manufacturing a copper alloy that simultaneously satisfies high electrical conductivity and high strength by uniformly distributing the nano-precipitates.

Description

Rotational spray nozzle apparatus for improving cooling rate during heat treatment}

One aspect of the present invention is a rotating spray nozzle for spraying cooling water in a chamber of a limited space (cylindrical, rectangular) in order to effectively cool a heated material to be heat treated in an apparatus for improving properties through rapid cooling of a metal material to be heat treated, and cooling It's about the device.

Recently, in order to meet the high-density, high-functionality, and precision of high-density electronic circuit elements for high power, high voltage, and high efficiency in eco-friendly vehicles, electric vehicles, and electronics industries, the establishment of manufacturing technology for high-conductivity and high-strength copper alloy materials and parts is urgently required. there is.

As a manufacturing technology of a copper alloy material capable of satisfying such high conductivity and high strength at the same time, as a representative method, an alloy design and heat treatment process method using a precipitation strengthening mechanism are used. In other words, the precipitation strengthening method finely and uniformly precipitates and disperses precipitates such as intermetallic compounds, carbides, borides, and phosphides that are stronger than the base, maintaining high electrical conductivity and simultaneously satisfying high strength of 800 MPa or more. Copper alloys, aluminum alloys, It is a method for manufacturing special steel alloys, super heat-resistant alloys, etc.

In general, for precipitation strengthening, a solid solution treatment process is performed in which the material to be heat treated is heated to a certain temperature at which the alloy elements forming the precipitation phase can be sufficiently re-dissolved in the matrix, and then rapidly cooled. , the aging treatment process, which is maintained for a certain period of time at a temperature at which fine precipitated phases can be uniformly precipitated in the matrix, is necessarily applied.

In the case of the conventional cooling system for solution heat treatment, air bubbles are generated on the surface of the material to be heat treated because it is simply immersed in a container containing water or oil, or liquid nitrogen gas is sprayed. Since the cooling speed (≤3℃/sec) is limited due to the secondary cooling effect and the rapid cooling effect is insufficient, the cooling performance of the material to be heat treated is improved by the fluid forced agitation cooling method, which is a proposed method to obtain a high cooling speed. methods have been developed to improve

However, there is a limitation in realizing a cooling rate higher than a certain level (≤ 7° C./sec) because the vaporized cooling water on the surface of the copper alloy at a high temperature of 950° C. or higher generates bubbles or a vapor layer is formed.

In particular, in order to manufacture a high-performance copper alloy material that can simultaneously satisfy high electrical conductivity and tensile strength with nano-precipitates (≤350 nm) uniformly distributed, a cooling rate higher than that obtained in conventional cooling method devices is essential. .

Therefore, research on a device for manufacturing a copper alloy that simultaneously satisfies high electrical conductivity and high strength by suppressing the generation of air bubbles on the surface of a high-temperature copper alloy, removing them as quickly as possible, improving cooling performance, and uniformly distributing nano-precipitates has been conducted. It is being done.

Republic of Korea Patent Registration No. 10-0879210

An object of the present invention is to suppress the generation of air bubbles generated on the surface of a high-temperature copper alloy, remove them as quickly as possible, improve cooling performance, and uniformly distribute nano-precipitates to manufacture a copper alloy that simultaneously satisfies high electrical conductivity and high strength, In order to effectively cool the heated material to be heat treated in an apparatus for improving properties through rapid cooling of a metal material to be heat treated, a rotary spray nozzle and a cooling device for spraying cooling water in a chamber of a limited space (cylindrical, rectangular) are provided. .

On the other hand, the technical problems to be achieved in the present invention are not limited to the above-mentioned technical problems, and other technical problems that are not mentioned will become clear to those skilled in the art from the description below. You will be able to understand.

One aspect of the present invention is a rotating spray nozzle that is fixed by a fixing means inside a chamber for cooling the metal surface of a heated material to be heat treated and sprays cooling water, comprising: a cooling chamber part connected to the fixing means; a nozzle unit protruding inward to inject cooling water on a surface of a material to be heat treated in an inward direction, and a cooling medium supply pipe connected to the cooling chamber unit and the nozzle unit to supply cooling water; and a spray nozzle tip including a spray part having a nozzle hole for receiving the cooling water from the cooling medium supply pipe and spraying the cooling water into the chamber, wherein the spray nozzle tips are symmetrically installed in the upper and lower parts of the cooling chamber. , each of which is a spray nozzle for spraying the cooling water onto the surface of the heat-treated material, and the spray nozzle tip includes a guide member for guiding a spray coverage angle β, which is an angle at which the coolant stream sprayed from the nozzle hole spreads, within a predetermined range. It is good.

The spraying angle β is preferably 50 to 70°.

In addition, the injection nozzle tip can be rotated at the front end of the injection nozzle to adjust the injection direction,

The nozzle angle (γ) of the injection nozzle tip is preferably in the range of 35 to 50°.

At this time, it is preferable that the diameter of the cooling medium supply pipe is 10 to 50 times the diameter of the nozzle hole.

In another aspect of the present invention, the number of spray nozzles is preferably provided in the range of 16 to 32, the spray pressure of the cooling water is preferably 5 to 30 bar, and the flow rate of the cooling water is 20 to 100 l/min. desirable.

Since cooling is performed in a chamber of a limited space (cylindrical, rectangular) in the rotary spray nozzle according to one aspect of the present invention, the cooling efficiency can be increased compared to the case of cooling in an open space, and the cooling chamber has an inclination ( δ), the cooling medium (water or gas) can be quickly discharged after cooling, and the cooling performance can be improved by quickly removing bubbles generated by using a rotating injection nozzle.

In the rotary spray nozzle, since the cooling medium overlaps (d) and collides with the surface of the object to be cooled from the spraying position of the cooling water, the spray pressure of the cooling water can be effectively transmitted, the spray angle can be easily adjusted, and a wide spray angle can be formed. advantageous to do

), 분사 각도(β), 노즐 각도(γ), 자유공간의 높이(h) 및 폭(w), 노즐의 개수(n), 분무범위의 중첩 길이(d) 등을 최적화 하여 냉각성능을 향상시켜 나노석출물을 균일하게 분포시킴으로써 고전기전도 및 고강도를 동시에 충족하는 동합금을 용이하게 제조할 수 있는 냉각환경이 안정적으로 제공될 수 있다.In addition, the diameter of the spray nozzle (

), spray angle (β), nozzle angle (γ), height (h) and width (w) of free space, number of nozzles (n), overlapping length of spray range (d), etc. are optimized to improve cooling performance. By uniformly distributing the nano-precipitates, a cooling environment capable of easily manufacturing a copper alloy that simultaneously satisfies high electrical conductivity and high strength can be stably provided.

On the other hand, the effects obtainable in the present invention are not limited to the effects mentioned above, and other effects not mentioned will be clearly understood by those skilled in the art from the description below. You will be able to.

1A and 1B are cross-sectional views schematically showing a state in which a rotary spray nozzle is coupled to a cooling chamber according to an embodiment of the present invention;
2 is a view showing the results of scanning electron microscope (SEM) and image analysis of the fraction by size of the precipitate phase in the copper alloy according to the cooling conditions in Experimental Examples 1 to 4;

Prior to describing the present invention in detail below, it is understood that the terms used herein are intended to describe specific embodiments and are not intended to limit the scope of the present invention, which is limited only by the appended claims. shall. All technical and scientific terms used herein have the same meaning as commonly understood by a person of ordinary skill in the art unless otherwise specified.

Here 1) The shape, size, ratio, angle, number, etc. shown in the accompanying drawings are schematic and may be slightly changed. 2) Since the drawings are drawn from the observer's point of view, the direction or position of the drawings may be variously changed according to the observer's position. 3) Even if the drawing numbers are different, the same reference numerals may be used for the same parts.

4) When 'comprises (comprises, comprises, comprising), has, consists of' is used, other parts may be added unless '~only' is used. 5) When described in the singular, it can be interpreted in the plural as well. 6) Even if the shape, size comparison, positional relationship, etc. are not described as 'weakly or substantially', they are interpreted so as to include a normal error range.

7) Even if terms such as 'after ~, before ~, then, subsequently, at this time' are used, they are not used in the meaning of limiting the temporal location. 8) Terms such as 'first, second, third' are simply used selectively, interchangeably or repeatedly for convenience of classification and are not interpreted in a limited sense.

9) If the positional relationship of two parts is explained by 'on ~, on ~, on ~ below, next to, on the side of, between, etc., between the two parts unless 'right' is used. One or more other parts may be located. 10) When the parts are electrically connected with '~ or', it is interpreted to include not only the parts alone but also the combination, but when they are electrically connected with 'either ~ or,', only the parts are interpreted.

Hereinafter, the components of the present invention will be described in detail based on the drawings.

1A and 1B are views schematically illustrating a state in which a rotary spray nozzle is coupled to a cooling chamber for heat treatment of a high-conductivity and high-strength copper alloy, which is an aspect of the present invention.

Referring to FIGS. 1A and 1B , a cooling chamber unit 5 connected to the fixing means, a nozzle unit 4 protruding toward the inside of the chamber and injecting cooling water on the surface of the material to be heat treated in an inward direction, and a cooling medium supply pipe 3 connected to the cooling chamber unit and the nozzle unit to supply cooling water; and a spray nozzle tip 7 including a spraying part having a nozzle hole for receiving the cooling water from the cooling medium supply pipe and spraying the cooling water into the chamber, wherein the spray nozzle tip is symmetrical to the upper and lower parts of the cooling chamber. are installed as spray nozzles for spraying the cooling water on the surface of the material to be heat treated, and the spray nozzle tip is a guide member for inducing the spray coverage angle β, which is an angle at which the coolant stream sprayed from the nozzle hole spreads, within a certain range. It is good to include

The spraying angle β is preferably 50 to 70°.

In addition, the injection nozzle tip may be rotated at the tip of the injection nozzle to adjust the injection direction, and the nozzle angle (γ) of the injection nozzle tip is preferably in the range of 35 to 50 °.

At this time, it is preferable that the diameter of the cooling medium supply pipe is 10 to 50 times the diameter of the nozzle hole.

In another aspect of the present invention, the number (n) of the spray nozzles is preferably provided in the range of 16 to 32, the spray pressure of the cooling water is preferably 5 to 30 bar, and the flow rate of the cooling water is 20 to 100 l /min is preferred.

The spray direction of the spray nozzle can be expressed by dividing it into a nozzle angle (γ) in the vertical direction and a spray angle (β) in the circumferential direction. The vertical nozzle angle γ means a smaller angle among the angles formed by the spraying direction with respect to the vertical axis of the cooling chamber 16 . The vertical nozzle angle may be formed in the range of 10 to 70 degrees, preferably 30 to 60 degrees, and more preferably 35 to 45 degrees.

The circumferential spray angle (γ) means the angle at which the spray direction deviates from the direction toward the central axis when the spray direction is observed along the central axis. It can be expressed as an angle formed with an imaginary plane passing through the nozzle of the nozzle. The spray angle in the circumferential direction may be formed in the range of 0 to 90 degrees, preferably in the range of 50 to 70 degrees.

The injection nozzle tip 7 may be a nozzle tip having a structure in which the injection part and the fastening part can rotate independently of each other. The fastening part coupled to the front end of the spray nozzle holder is fixed to the cooling medium supply pipe 4 by a screw thread, and the spray part of the spray nozzle tip 7 is rotatable and is adjusted to the desired spray direction by the spray angle controller to spray the coolant. can control.

If the diameter of the cooling medium supply pipe (4) is smaller than the corresponding range, the flow rate increases, making it difficult to further split the molten metal or form spherical powder, and if the diameter of the nozzle hole (7) is large, the flow rate decreases and the cooling effect There is a problem that the ratio of the amorphous phase of the metal powder produced is low.

The diameter of the hollow of the spray nozzle tip 7 may be the same as that of the nozzle hole, and smaller than the diameter of the passage of the cooling medium supply pipe 4, and the ratio may be 10 to 50 times, preferably. may be 15 to 30 times. If the diameter ratio is out of the range, the ratio between the flow rate of the injected coolant and the supplied coolant decreases, so the spray speed of the coolant decreases or it is difficult to pressurize the coolant supplied to a high pressure. There is a problem of inefficiency due to the increase in resistance due to the difference.

The spray coverage angle β means the angle at which the sprayed coolant spreads with respect to the spray direction, and is shown in FIGS. 1A and 1B. The spray coverage angle means the central angle of a conical or fan-shaped spray.

The spray coverage angle may be formed in the range of 10 to 70 degrees, preferably 50 to 70 degrees. The overlapping length (d) of the spray range is determined by the spray angle (β) and the nozzle angle (γ).

One embodiment of the present invention includes a structure protruding from both sides of the discharge port of the spray nozzle tip 7 and having a slit shape. The injection nozzle tip 7 includes slits protruding from both sides of the discharge port to adjust the spray shape and coverage angle of the sprayed coolant. The cooling water sprayed from the discharge port of the spray nozzle tip 74 may be sprayed in a symmetrical cone shape with respect to the circular nozzle hole, and the angle of the sprayed shape, that is, the size of the coverage angle, is different depending on the pressure and flow rate conditions of the cooling water. can be obtained

In order to set and maintain the size of the spray coverage angle at a desired angle, a protruding slit structure of the spray nozzle tip 7 included in one embodiment of the present invention may be used. Since the slip of the spray nozzle tip 7 protrudes from both sides of the nozzle hole, the spray shape of the coolant that is spread and sprayed is determined by the slit interval.

In addition, due to the presence of the slit, the coolant can be sprayed in a conical spray shape and a flat fan shape, so there is an advantage that an appropriate spray shape can be used according to the cooling area and the requirements for intensive cooling.

The slit interval of the injection nozzle tip 7 may be in the range of 0.3 to 5.0 mm, preferably in the range of 0.8 to 4.5 mm, more preferably in the range of 1 to 2.5 mm, and 2 to 6 times the diameter of the nozzle hole. , preferably three to four times.

When used in an apparatus for manufacturing high-conductivity and high-strength copper alloy through improved heat treatment and cooling performance, the number and arrangement of nozzles vary depending on the shape and size of the material to be heat-treated, and it is preferable that the number of nozzles is provided in the range of 16 to 32. Preferably, the distance between each nozzle is in the range of 10 to 100 mm.

If the number of nozzles is less than 8, since the cooling water is sprayed only on one side of the material to be heat treated, it is difficult to uniformly cool the overall molten metal droplets. In order to prevent water splashing irregularly, it is necessary to vary the spray angle of each sprayed nozzle, and the flow rate of the sprayed coolant increases, which increases production cost.

If the distance between the nozzles is out of the range, the desired cooling rate cannot be controlled because the control range of the overlapping length (d) of the spraying range is exceeded, resulting in a copper alloy having an unsound size and fraction of nano-precipitated phases. there is

When 16 or more injection nozzles for manufacturing metal powder are provided, the injection nozzles may be arranged symmetrically with respect to the central axis of the cooling chamber. It is good to be provided.

The supplied cooling water is supplied by a pressurizing device and supplied to a plurality of cooling water spray nozzles along the flow path of the cooling medium supply pipe 3, the flow rate of the supplied cooling water is in the range of 20 to 100 l/min, and the water pressure of the pressurized cooling water is It is preferably 5 to 30 bar.

Another embodiment of the present invention is a high-conductivity and high-strength copper alloy manufacturing apparatus including the above-described rotary spray nozzle for improving heat treatment and cooling performance.

One embodiment of the present invention includes a structure protruding from both sides of the discharge port of the spray nozzle tip 7 and having a slit shape. The injection nozzle tip 7 includes slits protruding from both sides of the discharge port to adjust the spray shape and coverage angle of the sprayed coolant. The cooling water sprayed from the discharge port of the spray nozzle tip 7 can be sprayed in a symmetrical cone shape with respect to the circular nozzle hole, and the angle of the sprayed form, that is, the size of the coverage angle, is different depending on the pressure and flow rate conditions of the cooling water. can be obtained

In order to set and maintain the size of the spray coverage angle at a desired angle, a protruding slit structure of the spray nozzle tip 7 included in one embodiment of the present invention may be used. Since the slip of the spray nozzle tip 7 protrudes from both sides of the nozzle hole, the spray shape of the coolant that is spread and sprayed is determined by the slit interval.

In addition, due to the presence of the slit, the coolant can be sprayed in a conical spray shape and a flat fan shape, so there is an advantage that an appropriate spray shape can be used according to the cooling area and the requirements for intensive cooling.

The slit interval of the injection nozzle tip 7 may be in the range of 0.3 to 5.0 mm, preferably in the range of 0.8 to 4.5 mm, more preferably in the range of 1 to 2.5 mm, and 2 to 6 times the diameter of the nozzle hole. , preferably three to four times.

When used in an apparatus for manufacturing high-conductivity and high-strength copper alloy through improved heat treatment and cooling performance, the number and arrangement of nozzles vary depending on the shape and size of the material to be heat-treated, and the number of nozzles is provided in the range of 16 to 32. Preferably, the distance between each nozzle is in the range of 10 to 100 mm.

If the number of nozzles is less than 8, since the cooling water is sprayed only on one side of the material to be heat treated, it is difficult to uniformly cool the overall molten metal droplets. In order to prevent water splashing irregularly, it is necessary to vary the spray angle of each sprayed nozzle, and the flow rate of the sprayed coolant increases, which increases production cost.

If the distance between the nozzles is out of the range, the desired cooling rate cannot be controlled because the control range of the overlapping length (d) of the spraying range is exceeded, resulting in a copper alloy having an unsound size and fraction of the nano-precipitated phase. there is

When 16 or more injection nozzles for manufacturing metal powder are provided, the injection nozzles may be arranged symmetrically with respect to the central axis of the cooling chamber. It is good to be provided.

The supplied cooling water is supplied by a pressurizing device and supplied to a plurality of cooling water spray nozzles along the flow path of the cooling medium supply pipe 3, the flow rate of the supplied cooling water is in the range of 20 to 100 l/min, and the water pressure of the pressurized cooling water is It is preferably 5 to 30 bar.

The temperature of the material to be heat treated is limited to 950 to 1,020° C. for solution heat treatment of the copper alloy, and can be controlled to obtain a desired cooling rate and to manufacture a high-conductivity and high-strength copper alloy with a high ratio of nano-precipitated phase.

The heating of the material to be heat treated is performed in an induction heater, which is an electric induction heating method, in order to efficiently perform continuous processes of plates, wire rods, and rods.

Another embodiment of the present invention includes a structure protruding from both sides of the discharge port of the injection nozzle tip 7 and having a slit shape. The injection nozzle tip 7 includes slits protruding from both sides of the discharge port to adjust the spray shape and coverage angle of the sprayed coolant. The cooling water sprayed from the discharge port of the spray nozzle tip 7 can be sprayed in a symmetrical cone shape with respect to the circular nozzle hole, and the angle of the sprayed form, that is, the size of the coverage angle, is different depending on the pressure and flow rate conditions of the cooling water. can be obtained

In order to set and maintain the size of the spray coverage angle at a desired angle, a protruding slit structure of the spray nozzle tip 7 included in one embodiment of the present invention may be used. Since the slip of the spray nozzle tip 7 protrudes from both sides of the nozzle hole, the spray shape of the coolant that is spread and sprayed is determined by the slit interval.

Example

Example 1

) 등을 변화시켜 냉각을 수행하였다.Fe _{bal prepared by vacuum centrifugal casting.} Ni _1.25 Si ₁ Mn _0.75 B _0.13 Zr _0.3 [wt.%] The copper alloy sheet is heated up to 1,000 ℃ through flow heating, and then the spray nozzle angle (γ) and spray Coverage angle (β), number of nozzle tips (n), nozzle tip hole diameter (

) and the like were changed to perform cooling.

Comparative Example 1

Fe _{bal produced by vacuum centrifugal casting without injection nozzle.} Ni _1.25 Si ₁ Mn _0.75 B _0.13 Zr _0.3 [wt.%] The copper alloy sheet was heated up to 1,000 °C through flow heating, and then cooled by immersing it in a cooling medium of ice water.

Experimental example

Experimental Examples 1 to 4: Fe _bal. Ni _1.25 Si ₁ Mn _0.75 B _0.13 Zr _0.3 [wt.%] Manufacture of copper alloy sheet

Examples 1 to 3 and Comparative Example 1 were heated up to 1,000 ° C through fluidized heating.

)을 고정하여 냉각을 수행하였다.For Examples 1 to 3, the injection nozzle angles (γ) were set to 35 ° and 40 ° 40 °, and the injection coverage angles (β) were set to 50 ° 55 ° 60 ° using the cooling performance device for heat treatment by rotary injection nozzles ( n) was changed to 16, 16, and 32, the quantity was changed to 20 ℓ / min, 30 ℓ / min, and 40 ℓ / min, and the pressure was changed to 5 bar, 6 bar, and 5 bar, respectively, and the nozzle tip hole diameter (

) was fixed to perform cooling.

For Comparative Example 1, cooling was performed by immersing in a cooling medium of ice water (4° C.).

The results of Experimental Examples 1 to 3 and Comparative Example 1 are summarized in Table 1 below.

Experimental Example 5

In Experimental Examples 1 to 3 and Comparative Example 1, the size of the high-conductivity and high-strength copper alloy precipitated phases according to the cooling conditions was measured using a scanning electron microscope (SEM) and an image analyzer. The results are summarized in Table 2 below, and the measurement graph is shown in FIG. 2 .

The features, structures, effects, etc. illustrated in each of the above-described embodiments can be combined or modified with respect to other embodiments by those skilled in the art in the field to which the embodiments belong. Therefore, contents related to these combinations and variations should be construed as being included in the scope of the present invention.

1: guide roller, 2: heater, 3: cooling medium supply pipe, 4: cooling nozzle, 5: cooling chamber, 6: heat treatment target material, 7: spray nozzle tip diameter (φ), 8: nozzle angle (γ), 9: spray angle (β), 10: overlap length of spray range (d), 11: cooling chamber inclination angle (δ)

Claims (8)

In the rotary spray nozzle that is fixed by a fixing means to the inside of a chamber for cooling the heated metal surface of the heat-treated material and sprays cooling water,
A cooling chamber part connected to the fixing means, a nozzle part protruding toward the inside of the chamber and injecting cooling water to the surface of the heat-treated material in an inward direction, and a nozzle part connected to the cooling chamber part and the nozzle part to supply cooling water cooling medium supply pipe; and
A spray nozzle tip including a spraying part having a nozzle hole for receiving the cooling water from the cooling medium supply pipe and spraying the cooling water into the chamber;
The spray nozzle tips are symmetrically installed in the upper and lower parts of the cooling chamber to spray the cooling water to the surface of the heat-treated material, respectively.

The injection nozzle tip is rotated at the front end of the injection nozzle holder to adjust the injection direction,
The injection nozzle angle of the injection nozzle tip is in the range of 35 to 50 °,

The diameter of the cooling medium supply pipe is 10 to 50 times the diameter of the nozzle hole,

The injection nozzles are provided in the range of 16 to 32,
The spray direction of the spray nozzle is divided into a nozzle angle (γ) in the vertical direction and a spray angle (β) in the circumferential direction,
The vertical nozzle angle (γ) is formed from 10 to 70 degrees,
The circumferential spray angle β is formed from 0 to 90 degrees,

The spray nozzle tip includes a guide member for guiding a spray coverage angle, which is an angle at which the coolant stream sprayed from the nozzle hole spreads, within a predetermined range;
The spray coverage angle is 50 to 70 °,
The overlapping length (d) of the injection range is determined by the injection angle (β) and the nozzle angle (γ),

The guide member is a protruding slit structure of the injection nozzle tip,
The spray form of the cooling water is determined by the slit interval of the slit structure,
Based on the slit structure, the cooling water is sprayed in a conical spray shape and a flat fan shape, so that the spray shape can be selectively used according to the cooling area and intensive cooling requirements,
The slit spacing is in the range of 0.3 to 5.0 mm heat treatment cooling performance improving rotary spray nozzle.
delete delete delete delete delete According to claim 1,
The spray pressure of the cooling water is a heat treatment cooling performance improving rotary spray nozzle of 5 to 30 bar. According to claim 1,
The flow rate of the cooling water is 20 to 100 l / min heat treatment cooling performance improving rotary spray nozzle.

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