KR20100111181A - Apparatus for quenching - Google Patents

Abstract

A heat treatment apparatus using high frequency, medium frequency, or low frequency is disclosed. Such a heat treatment apparatus includes a transfer unit for transferring a material to a rotating state; A heating unit for heating the material conveyed by the conveying unit by frequency; A non-heating portion is formed between the exit of the heating unit and a heating section spaced apart from the exit by a predetermined distance from the exit, and spraying coolant to the outside of the material being transferred in a rotating state by the transfer unit; Heat preventing means for preventing the non-heating unit from generating heat in the heating section; And a heat treatment part disposed at an adjacent position of the heat preventing means to spray cooling water to the outside of the material passing through the heat generating section so as to cool the heat generating part except the non-heating part.

Description

Heat Treatment Equipment {APPARATUS FOR QUENCHING}

The present invention relates to a heat treatment apparatus, and more particularly, a heat treatment apparatus capable of weakening brittleness that may occur in a material when quenching and heating the heated material by improving the heat treatment method using frequency, medium frequency, or low frequency. It is about.

In general, a heat treatment device using a frequency, a medium frequency, or a low frequency (hereinafter referred to as a heat treatment device) flows a high-frequency, medium-frequency, or low-frequency (hereinafter referred to as a frequency) current through a metal material, and a eddy current in the metal flows. It is a device that uses the principle of generating high temperature heat.

In the heat treatment apparatus, after the material is heated by the coil, the material is rapidly cooled by the cooling water to form a hardened hardened layer on the surface of the material.

The heat treatment apparatus includes a transfer unit for transferring a material, a heating unit for heating the material transferred by the transfer unit, and a cooling unit for heat treatment by rapidly cooling the heated material.

Therefore, the material is conveyed by the conveying part and passed through the heating part, whereby the material is heated, and the material can be heat-treated by rapid cooling by the injected cooling water while passing through the cooling unit.

Furthermore, when the material is in the form of a hollow pipe, both the inner circumferential surface and the outer circumferential surface of the material may be heat-treated by providing an inner cooling part for cooling the inner circumferential surface of the material and an outer cooling part for cooling the outer circumferential surface of the material.

However, in such a heat treatment apparatus, the material is first heated by the heating unit, and then the cooling water is sprayed on the surface of the material while passing through the cooling unit to rapidly cool the bar. Since there is a problem that the surface crack may occur.

In particular, in the case of a hollow pipe applied to a pump car, concrete containing liquid sand, gravel and cement is pumped at high pressure at high speed, so that the concrete pumped through the inside of the pipe impacts the inner circumferential surface of the pipe. There is a problem that the crack may be generated on the inner peripheral surface of the pipe may be broken.

Accordingly, the present invention has been made to solve this problem, the object of the present invention is to improve the heat treatment method for the material, to prevent the occurrence of cracks in the material by weakening the brittleness that may occur during the heat treatment of the material It is to provide a heat treatment apparatus that can be.

In order to achieve the object of the present invention as described above, the present invention transfer unit for transferring the material in a rotating state; A heating unit for heating the material conveyed by the conveying unit by frequency; A non-heating portion is formed between the exit of the heating unit and a heating section spaced apart from the exit by a predetermined distance from the exit, and spraying coolant to the outside of the material being transferred in a rotating state by the transfer unit; Heat preventing means for preventing the non-heating unit from generating heat in the heating section; And a heat treatment part disposed at an adjacent position of the heat preventing means and spraying cooling water to the outside of the material passing through the heat generating section so as to cool the heat generating part except the non-heating part.

As described above, the heat treatment apparatus according to the embodiment of the present invention forms a non-heating part by spraying the coolant to the outer surface of the material by the heat preventing means before the material to which the frequency is applied while passing through the heating part is generated. After heating only the heating portion except for the non-heating portion is heated, the heating portion is cured by cooling the material, the non-heating portion is not cured, there is an advantage that the brittleness can be weakened.

Hereinafter, a heat treatment apparatus according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

As shown in Figures 1 to 3, the heat treatment apparatus proposed by the present invention and the transfer unit (1,3) for transferring the material (P); A heating part 5 for applying a predetermined frequency to the material P conveyed by the conveying parts 1 and 3; Before the material passing through the heating part 5 generates heat, the non-heating part 33 is formed along the spiral shape on the outer surface of the material P by spraying coolant along the spiral shape on the outer surface of the material P. Heat prevention means (7) to be; It includes a cooling unit (8) for cooling by spraying the cooling water to the outer surface of the material passing through the heat protection means (7).

In the heat treatment apparatus having such a structure, the conveying portions (1,3) are arranged along the longitudinal direction on a horizontal table and connected to a driving portion (not shown) and connected to the drive shaft (9); A plurality of drive gears 13 provided on each of the drive shafts 9 and rotating together; A transfer gear 16 engaged with each of the drive gears 13 and arranged to have an axis inclined with respect to the axis of rotation of the drive gear 13; It is coupled to the transfer gear 16 coaxially and rotates together to include a conveying roller 17 for conveying the material (P).

At this time, the outer circumferential surfaces of the feed rollers 17 facing each other are parallel to each other, and the outer circumferential surfaces are also parallel to the feed direction of the raw material P and the rotation axis of the drive gear 13.

Therefore, when the feed roller 17 is rotated, the material P seated on the upper portion of the feed roller 17 is transferred to the heating unit 5 in a rotating state.

The heating section 5 includes an electrode section 20 connected to two terminals of the frequency oscillator, respectively; The material P may pass therethrough and is connected to the electrode unit 20 and includes a heating coil 23 for heating the material P by receiving a frequency from the frequency oscillator. It may also include mid frequencies, or low frequencies.

In the heating unit having such a structure, the electrode unit 20 includes a first electrode 20a through which the current supplied from the frequency oscillator flows and a current introduced through the first electrode 20a to the frequency oscillator. And a second electrode 20b flowing out, and an insulating material 20c inserted between the first and second electrodes 20a and 20b.

The heating coil 23 preferably has a circular shape to surround the outer circumference of the raw material (P). Therefore, when a frequency is applied to the material P from the heating coil 23, the material P may be heated to a predetermined temperature.

At this time, the material (P) is a frequency is applied while passing through the inner section of the heating coil 23, it may be heat generated in the exit section of the heating coil (23). That is, since the frequency of the material P is applied and it takes a certain time until it is heated by the applied frequency, the position where the material P is actually heated is a heating section H away from the heating coil 23 by a predetermined distance. From when you pass.

Accordingly, the heat preventing means 7 is disposed between the exit side O of the heating part 5 and the heating section H, so that the material to which the frequency is applied while passing through the heating section 5 is the heating section ( Before reaching H), the coolant is sprayed on the outer surface of the work piece P to prevent the work piece H from being heated.

The heat preventing means 7 is a cooling nozzle 30 connected to the cooling water supply unit (not shown), and the injection nozzle connected to the cooling water pipe 30 to spray the cooling water to the outer surface (S1) of the material (P) (31).

Therefore, when the tip P1 of the raw material P passing through the heating part 22 reaches the heat prevention means 7 as shown in FIG. 4, the coolant injected from the injection nozzle 31 is discharged. It is injected to the tip P1 of the raw material P.

At this time, the raw material (P) is a state in which it is transferred while rotating by the transfer unit (1, 3), the injection nozzle 31 is in a fixed state.

Therefore, the cooling water sprayed by the injection nozzle 31 is sprayed along the spiral shape on the outer surface S1 of the raw material P, so that when the raw material reaches the heating section H and generates heat, the spiral part is As heat is not generated, only the other part is generated, so that the band mark B is formed on the outer surface S1 of the raw material P, as shown in FIG. 5.

That is, the outer surface S1 of the material P is formed adjacent to the non-heating unit 33 and the non-heating unit 33 that do not generate heat by spraying the cooling water, and the heat generating unit 35 that generates heat by not cooling the sprayed water. ) Are alternately formed to form a band mark (B).

In addition, the axial length ratio L: L1 between the non-heating portion 33 and the heat generating portion 35 formed in the material P is preferably maintained at 15: 100. Moreover, it is preferable to maintain the thickness ratio D1: D of 1: 3 in the radial direction of the raw material P. FIG.

At this time, the distance L1 between the non-heating unit 33 and the heat generating unit 35 has a correlation with the feed rate of the raw material P, the hydraulic pressure and the flow rate of the cooling water.

That is, according to the feed rate of the raw material P, the gap between the non-heating portion 33 and the heat generating portion 35 is formed to be wide or narrow, and also by increasing or decreasing the hydraulic pressure of the cooling water to control the flow rate of the band mark B ) Can be adjusted.

As described above, the non-heat generating portion 33 is formed along the spiral shape on the outer surface S1 of the raw material P, so that the raw material P is quenched by the cooling unit 8 in a later step to perform the heat treatment process. Even after this, the non-heating part 33 does not change a tissue.

On the other hand, the cooling unit 8 is disposed in the adjacent position of the heat prevention means 7 to secondaryly spray the coolant to the outer surface of the material (P) passing through the heating section (H) to quench the material entirely And an inner side cooling part 28 inserted into the inside of the raw material P to quench the inner surface S of the raw material P.

In the cooling unit having such a structure, the outer cooling unit 26 has one or more cooling water inlets 30 to which cooling water is supplied, and cooling water jets 32 arranged in an annular shape to inject the introduced cooling water.

Accordingly, the outer cooling unit 26 may rapidly cool the entire area of the raw material P by spraying cooling water on the surface of the raw material P heated to a predetermined temperature while passing through the heating section H.

At this time, the material is a state in which the remaining portion other than the non-heating portion 33, that is, the heat generating portion 35 is heated while passing through the heating section (H).

As a result, when coolant is sprayed on the outer surface of the raw material P, only this heat generating portion is quenched to harden the structure, and the non-heating portion is not hardened, so that the heat treated portion and the non-heat treated portion are alternated in the raw material. The brittleness can be weakened by being formed into.

On the other hand, the inner cooling unit 28 is inserted into the inside of the material (P), when the material (P) is a hollow pipe to cool the inner surface (S) of the material (P) by spraying the cooling water. .

The inner cooling unit 28 includes a coolant inlet pipe 34 through which coolant is supplied, and a coolant injection hole 36 arranged in an annular shape to inject the introduced coolant.

Therefore, the coolant injected through the coolant injection hole 36 may be cooled on the entire surface by spraying the inner (S) surface of the raw material (P).

At this time, the material (P) is a linear movement in the rotating state by the transfer unit (1, 3), the cooling water injection port 36 is in a fixed state.

Therefore, the cooling water injected from the cooling water injection port 36 may uniformly cool the entire inner surface S of the material P.

As a result, the inner surface S of the raw material P is hardened to a predetermined strength or more, so that cracks may be prevented from occurring on the inner surface S even when the concrete is transported at a high speed / high pressure state.

In this case, when the inner cooling unit 28 is inserted into the material P by being connected to a support (not shown), deflection may be prevented.

Therefore, when such a hollow material P is applied to a pump car, the outer surface S1 of the material P is heat-treated in a state in which brittleness is alleviated, thereby preventing the occurrence of cracks, and Since the inner surface S may be maintained in strength, wear or cracks may be prevented even when high speed / high pressure concrete is transferred.

1 is a plan view showing a heat treatment apparatus according to an embodiment of the present invention.

FIG. 2 is an enlarged perspective view illustrating an enlarged view of the heating unit, the heat preventing unit, and the cooling unit illustrated in FIG. 1.

3 is a view schematically showing the structure of the heating unit, the heat preventing means, and the cooling unit shown in FIG. 2.

4 is a view schematically showing a state in which the heat generating portion and the non-heating portion are formed along the spiral shape on the outer surface of the material by the heat preventing means shown in FIG. 2.

FIG. 5 is a cross-sectional view schematically illustrating a heating part and a non-heating part formed on an outer surface of the material shown in FIG. 4.

Claims (4)

Transfer unit for transferring the material to the rotating state; A heating unit for heating the material conveyed by the conveying unit by frequency; A non-heating portion is formed between the exit of the heating unit and a heating section spaced apart from the exit by a predetermined distance from the exit, and spraying coolant to the outside of the material being transferred in a rotating state by the transfer unit; Heat preventing means for preventing the non-heating unit from generating heat in the heating section; And And a heat treatment part disposed at an adjacent position of the heat preventing means to spray cooling water to the outside of the material passing through the heat generating section so as to cool the heat generating parts other than the non-heating part. The method of claim 1, The heat preventing means includes a cooling water pipe connected to a cooling water supply unit, and a spray nozzle connected to the cooling water pipe to spray cooling water to an outer surface of the material. The method of claim 1, And the non-heating part and the heat generating part maintain a length ratio of 15: 100 in the axial direction, and maintain a thickness ratio of 1: 3 in the radial direction. The method of claim 1, The heat treatment apparatus further includes an inner cooling unit for heat treatment by spraying the cooling water on the inner peripheral surface of the material, The inner cooling unit includes a cooling water inlet tube to which the cooling water is supplied, and a cooling water injection hole arranged in an annular shape to spray the introduced cooling water onto the inner circumferential surface of the material.

Images