KR20120082137A - Apparatus for induction heat treatment - Google Patents

Abstract

PURPOSE: High-frequency heat treatment equipment is provided to obtain an uniform hardening depth by straightly transferring materials inside a cooling chamber. CONSTITUTION: High-frequency heat treatment equipment comprises a feeder(10), a transferring unit(20), a high-frequency heating unit(30), and a cooling unit(40). The feeder continuously feeds materials. The materials supplied from the feeder are settled on a conveyor of the transferring unit. The high-frequency heating unit heats the materials. The cooling unit comprises a cooling chamber, injection nozzles, transferring rolls, and a cooling unit conveyor. A plurality of the injection nozzles is installed in an upper part of the cooling chamber, and jets coolants to the heated materials. A pair of the transferring rolls is coupled to a driving unit, and rotates the heated materials in one direction.

Description

High Frequency Heat Treatment Equipment {APPARATUS FOR INDUCTION HEAT TREATMENT}

The present invention relates to a high frequency heat treatment apparatus, and more particularly, in the cooling chamber equipped with a spray nozzle, it is possible to rotate the material to be subjected to heat treatment and to move it straight so that a uniform hardening depth can be obtained and continuously. It relates to a high frequency heat treatment apparatus that can be heat treatment.

In general, a heat treatment method using high frequency induction heating is a process in which a high frequency current flows in a coil when a high frequency current flows in a primary circuit composed of a coil using various mechanical parts made of steel, which is a material to be heated, as a secondary circuit. Eddy current is induced on the surface layer of the heated object by the alternating magnetic flux generated at, and the surface layer of the heated object is heated above the A1 to A3 transformation point of the steel by using Joule heat generated at this time. By blocking the current flow of the coil and quenching the heated object by using a cooling medium such as a coolant, the internal structure of the object to be heated can be made of martensite with only the surface layer of the object being unchanged. Heat treatment method.

The surface heat treatment method using the high frequency induction heating method mainly improves mechanical properties such as fatigue strength, abrasion resistance and toughness of steel mechanical parts because of the advantages of rapid heating of the heated object and only locally heating the surface of the heated object. It is widely used, and contributes greatly to the weight reduction and durability of various machine parts.

The conventional surface heat treatment method using high frequency induction heating includes a vertical heat treatment method for immersing a heated mechanical part in a cooling medium after heating various mechanical parts that are to be heated by high frequency induction heating, and the material in a horizontal direction. It can be divided into a horizontal heat treatment method for cooling the water by spraying the cooling water from the upper portion while transferring to.

However, in the case of the vertical heat treatment method, a separate equipment such as a water tank is required, and the size of the device is large. In the case of mechanical parts that require high precision since the deformation of the overall shape of the mechanical parts is required, post-processing is required after heat treatment, resulting in an increase in the production cost of the product due to additional time, manpower, and facilities.

In order to solve this problem, the Republic of Korea Patent Publication No. 0963741, the supply part for supplying the material for the track pin in one direction, and the inlet and outlet are arranged on the supply path of the supply part and located on the same line, the material supplied to the electric An induction heating furnace for induction heating, a distribution unit disposed at an outlet side of the induction heating furnace and selectively supplying a material to a plurality of transfer chutes that are divided into pieces, and a plurality of rotating rollers and spray nozzles respectively connected to each of the transfer chutes The present invention discloses a "track pin manufacturing method and apparatus thereof" comprising a plurality of cooling sections for cooling while rotating a raw material.

This is not a conventional immersion type cooling method, as shown in Figure 1, evenly distributed over the entire area of the material as the water cooling is made by rotating the material by placing a rotary roller and injection nozzle on the outer periphery of the material It is possible to improve the quality of the product by preventing the deformation that can occur during cooling by eliminating the variation in the cooling rate of each part can be cooled.

However, the heat treatment apparatus described above has a problem in that the heat treatment process of the material in the cooling unit is not continuously performed, but is configured to discharge the material by the pushing cylinder after the one heat treatment, thereby lowering the work speed and lowering the productivity.

The present invention has been made in order to solve the problems described above, it is possible to move the material to be heat treated in the cooling chamber equipped with the injection nozzle and at the same time can be moved straight, as well as to obtain a uniform curing depth It is not an object of the present invention to provide a high frequency heat treatment apparatus capable of continuously performing heat treatment.

In addition, another object of the present invention is to provide a high frequency heat treatment apparatus capable of minimizing the contact area between the driving means and the material and at the same time enabling the smooth discharge of the cooling water to enable effective cooling treatment within a short time.

In addition, another object of the present invention is to provide a high-frequency heat treatment apparatus capable of automatically aligning a material to be subjected to heat treatment in a longitudinal direction to enable continuous transfer to reduce manufacturing costs.

In addition, another object of the present invention is to provide a high-frequency heat treatment apparatus capable of preventing a delay in productivity and a decrease in productivity by manual labor and automating the entire process of heat treatment.

In order to achieve the above object, the high frequency heat treatment apparatus according to the present invention includes: a feeder unit for continuously supplying a material to be heat treated; and a conveying unit having a conveyor on which the material supplied through the feeder unit is seated; A high frequency heating unit for applying heat to the material transferred through the transfer unit; And a cooling unit configured to cool the material heated by the high frequency heating unit, wherein the cooling unit includes a cooling chamber provided with an oil inlet / outlet of the heated material, and a plurality of upper portions in the cooling chamber. And a spray nozzle for ejecting cooling water to the heated material, a feed roll installed in a pair while facing the lower portion in the cooling chamber, and rotated in one direction, the heated material seated on the upper part, coupled to a driving means, and The cooling unit conveyor is installed on the lower portion of the conveying roll and fixed to the conveying bracket protruding upward in the spaced space between the pair of conveying rolls is provided.

At this time, the driving means, it is preferable that the coupling is formed with a pair of driving rolls respectively engaged with one end of the pair of feed rolls and engaged with an external driving source to impart rotational force to the feed rolls.

In addition, the outer periphery of the feed roll is preferably formed with an uneven portion in the longitudinal direction of the feed roll.

In addition, the feeder unit, a support frame fixed to the ground, a plurality of fixing stand is fixed to the support frame and spaced apart by varying the installation height of the upper end inclined in the direction of the material supply direction, and the space of each of the fixing stand It comprises a plurality of lifting platform which is raised and lowered in the inside, and the platform is disposed at the foremost end of the material supply direction, so that the material is continuously transferred in the material supply direction by the lifting movement of the platform It is preferable.

In addition, the upper portion of the conveyor provided in the conveying unit, a support fixed to the ground, the weight hinged and coupled with the support and the end of the material conveyed by the conveyor to swing the sensor to detect the movement of the weight And, it is preferable that the feeder unit control unit further comprises a controller for controlling the operation of the platform using the information of the sensor.

In addition, the front end of the cooling unit, the ejector unit conveyor for transporting the heated material, a drive cylinder fixed to the upper part of the ejector unit conveyor, and spaced apart from the ejector unit conveyor and communicated with the inlet of the cooling chamber Ejector portion made of a cradle; is further provided, at the distal end of the drive cylinder, between the pair of protruding end and the pair of protruding end protruding forward end of the end plate and the end plate and the upper end of the distal end is connected; Ejector head bundles including hinged swing blocks are provided, and the heated material conveyed by the ejector unit conveyor is temporarily suspended on the cradle by using the ejector head bundles, and then the cooling cylinder is moved to the cooling unit. It is desirable to transfer the heated material.

In this case, it is preferable that the cradle is provided with a cutout, and further includes a locking hole protruding upward while penetrating the cutout and hinged with the cradle.

According to one embodiment of the present invention as described above, first, in the cooling chamber equipped with a spray nozzle, it is possible to rotate the material to be processed at the same time and to move straight, thereby obtaining a uniform curing depth as well as continuous As a result of the heat treatment, there is an advantageous effect that the productivity is greatly improved.

Second, by forming the uneven portion in the longitudinal direction on the outer periphery of the feed roll, it is possible to minimize the contact area between the feed roll and the material and at the same time smooth discharge of the cooling water has the advantage that the effective cooling treatment in a short time.

Third, the feeder unit is provided with a lifting table that is raised and lowered between the plurality of fixing rods, it is possible to automatically align the material to be subjected to the heat treatment in the longitudinal direction to enable continuous transfer to reduce the manufacturing cost.

Fourth, by further comprising a feeder control unit and an ejector, there is an advantage that can prevent the delay of work speed and productivity decrease by manual operation and can automate the entire process of heat treatment.

1 is an operating state of the cooling unit of the conventional heat treatment apparatus,
2 is a block diagram of a high frequency heat treatment apparatus according to an embodiment of the present invention,
3 is a front view of a cooling unit according to an embodiment of the present invention;
4 is a plan view of a cooling unit according to an embodiment of the present invention;
5 is a side view of a cooling unit according to an embodiment of the present invention;
6 is an operating state diagram of the cooling unit according to an embodiment of the present invention,
7 is an operating state diagram of the feeder unit according to an embodiment of the present invention,
8 is an operating state of the feeder unit control unit according to an embodiment of the present invention,
9 is a perspective view of an ejector unit according to an embodiment of the present invention;
10 is an operation state diagram of the ejector unit according to an embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings, which are intended to describe in detail enough to be able to easily carry out the invention by those skilled in the art to which the present invention belongs, This does not mean that the technical spirit and scope of the present invention is limited.

2 is a configuration diagram of a high frequency heat treatment apparatus 100 according to an embodiment of the present invention, and FIGS. 3 to 5 are front views, top views, and side views of the cooling unit 40 according to an embodiment of the present invention. 6 is an operating state diagram of the cooling unit 40 according to an embodiment of the present invention.

The high frequency heat treatment apparatus 100 according to the embodiment of the present invention includes a feeder unit 10, a transfer unit 20, a high frequency heating unit 30, and a cooling unit 40.

The feeder unit 10 serves to continuously supply the material to be heat treated to the transfer unit 20 to be described later.

The transfer unit 20 serves to transfer the material supplied from the feeder unit 10 to the high frequency heating unit 30 to be described later, the conveyor 21 is provided. The conveyor 21 may be adopted a variety of driving means such as belt or chain.

The high frequency heating unit 30 heats the material conveyed through the transfer unit 20 described above, which is turned on / off by switching the commercial power applied to the induction coil of the closed shape. / OFF), and a strong magnetic field is generated by the counter electromotive force generated by this switching to generate an eddy current (EDDY CURRENT) in the material placed in the closed space. Joule heat (JOULE'S HEAT) is generated by this eddy current to cause self-heating. The high frequency heating unit 30 of the present invention may be composed of a variety of high frequency heating device, including the Republic of Korea Patent No. 0961790.

The cooling unit 40 serves to cure the surface of the material by water-cooling the material heated through the high frequency heating unit 30 described above.

The cooling unit 40 according to an embodiment of the present invention includes a cooling chamber 41, an injection nozzle 42, a transfer roll 43, and a cooling unit conveyor 44.

The cooling chamber 41 is a space for surface hardening the material 1 heated through the high frequency heating unit 30 using the cooling water, and the material quenched with the inlet and the cooling water into which the heated material 1 is introduced ( The outlet 1) is provided. In addition, a coolant inlet port for supplying coolant to the injection nozzle 42 and a coolant outlet port through which the coolant jetted to the raw material 1 are further provided.

The injection nozzle 42 is installed in the plurality in the upper portion in the cooling chamber 41 serves to eject the coolant to the heated material (1). In addition, in order to increase the spraying area of the coolant as shown in FIG. 3, it is preferable to make the coolant be ejected in an inclined direction toward the outlet through which the material is discharged, not in the vertical direction, and as shown in FIG. 5. It is preferable to install the end inclined so as to face the center of the material 1 so that it can be concentrated on the material 1.

The feed roll 43 rotates the heated material 1 in one direction to allow uniform heat treatment over the entire outer circumference of the material 1. To this end, the feed rolls 43 are spaced apart from each other in pairs while facing each other in the lower portion of the cooling chamber 41, and each feed roll 43 is engaged with the driving means to rotate in the same direction.

At this time, the feed roll 43 of the high-frequency heat treatment apparatus 100 according to an embodiment of the present invention, it is preferable that the uneven portion is provided in the longitudinal direction of the feed roll 43 on the outer circumference. As a result, the contact area between the transfer roll 43 and the material 1 is minimized, and at the same time, the cooling water can be smoothly discharged, and thus an effective cooling treatment can be performed within a short time.

In addition, the driving means according to an embodiment of the present invention preferably comprises a pair of drive rolls 46 engaged with one end of each of the pair of feed rolls 43 described above and fastened with an external drive source. . Referring to FIG. 6, the drive roll 46 is engaged with the feed roll 43 and disposed outside the feed roll 43, and one end of the drive roll 46 is provided outside the cooling chamber 41. Connected to the rotating shaft of the driven motor. In this case, in order to avoid interference between the chain and the outlet of the cooling chamber 41, it is preferable to add a support roll 47 to the upper portion of the outlet to connect the chain.

The cooling unit conveyor 44 is installed in the lower portion of the transfer roll 43 described above to transfer the heated material (1) straight to enable continuous heat treatment. To this end, the conveying bracket 45 is fixedly installed by fixing the conveying bracket 45 protruding upward between the spaces between the pair of conveying rolls 43 to the cooling part conveyor 44 composed of a chain or a belt. To be in contact with the end of the Therefore, as the cooling unit conveyor 44 is driven by a motor or the like, the transfer bracket 45 moves, and at this time, the material 1 in contact with the end of the transfer bracket 45 also moves in the direction of movement of the transfer bracket 45. Are conveyed together. As a result, the raw material 1 is rotated by the feed roll 43, so that the straight transfer is possible by the feed bracket 45. As shown in FIG. 3, the distance and the number between the transfer brackets 45 may be adjusted in consideration of the length of the material.

As described above, in the cooling chamber 41 equipped with the injection nozzle 42, the raw material 1 to be heat treated can be rotated and moved straight, so that not only a uniform curing depth can be obtained but also continuous As a result of the heat treatment, there is an advantageous effect that the productivity is greatly improved.

7 is an operating state diagram of the feeder unit 10 according to an embodiment of the present invention.

The feeder unit 10 of the high frequency heat treatment apparatus 100 according to the exemplary embodiment of the present invention includes a support frame 11, a fixing table 12, and a lifting table 13.

The support frame 11 is fixedly installed in the vertical direction with respect to the ground serves to support the holder 12 to be described later.

The holder 12 is fixed to the support frame 11 in a flat plate shape, a plurality of them are spaced apart in an inclined direction in the material supply direction. At this time, the upper end of the fixing stand 12 is installed with a different height, it is preferable to form a staircase with a constant height in the material supply direction.

The lifting platform 13 is raised and lowered in the separate space of the fixing table 12, and is lifted between the fixing table 12 by the driving of the hydraulic cylinder (14). At this time, the stroke length of the hydraulic cylinder 14 is determined by the height of the staircase of the fixing rod 12, so that the material 1 seated on the lifting platform 13 in one stroke of the hydraulic cylinder 14 is positioned one step higher. To be transported. As a result, the raw material 1 aligned in the longitudinal direction can be continuously supplied to the transfer part 20. To this end, the lifting platform 13 rather than the fixing table 12 is disposed at the foremost end of the material supply direction.

Therefore, by using the fixing table 12 and the lifting table 13 to automatically align the material to be subjected to the heat treatment in the longitudinal direction to enable continuous transfer, it is possible to reduce the manufacturing cost because no separate equipment or manpower for alignment is required. There is an advantage.

8 is an operational state diagram of the feeder unit control unit 22 according to an embodiment of the present invention.

The high frequency heat treatment apparatus 100 according to an embodiment of the present invention may further include a feeder control unit 22 including a support 221, a weight 222, a sensor 223, and a controller. .

The support 221 is fixed to the ground at the top of the conveyor 21 provided in the conveying unit 20, the weight 222 is hinged to the support 221 is a material (1) conveyed on the conveyor 21 (1) When it comes in contact with the end of the swing, it swings upward. The sensor 223 detects the movement of the weight 222 to check whether the material 1 has passed. For example, as the weight 222 is swung upward by the material 1, the change of the magnetic field generated in the magnetic sensor may be detected to determine whether the material 1 passes. The controller operates the platform 13 of the feeder unit 10 when it is confirmed that the material 1 on the conveyor 21 is not detected for a predetermined time or a certain number of materials 1 have been passed using the sensor information. By controlling the raw material 1 to be supplied to the conveyor 21.

9 and 10 are a perspective view and an operating state diagram of the ejector unit 50 according to an embodiment of the present invention.

In the high frequency heat treatment apparatus 100 according to the exemplary embodiment of the present invention, the ejector unit 50 including the ejector unit conveyor 51, the cradle 53, and the driving cylinder 52 is further disposed at the front end of the cooling unit 40. It may be provided.

The ejector unit conveyor 51 is fastened by a belt or a chain to transfer the material 1 heated in the high frequency heating unit 30.

The holder 53 is spaced apart from the ejector unit conveyor 51 at a predetermined interval, the cooling chamber 41 by the drive cylinder 52 to be described later the material (1) transferred by the ejector unit conveyor (51) Make sure to maintain a temporary stop before being transported. The distal end is provided to be adjacent to the inlet of the cooling chamber 41.

The driving cylinder 52 is fixed to the upper part of the ejector part conveyor 51 and serves to transfer the heated material 1 temporarily suspended on the holder 53 to the cooling part 40.

Meanwhile, at the distal end of the driving cylinder 52, the material 1 transferred through the ejector part conveyor 51 is temporarily suspended on the holder 53, and the stopped material 1 is stopped at the driving cylinder 52. An ejector head bundle 54 is provided, which serves to transfer to the cooling chamber 41 in operation.

To this end, the ejector head bundle 54 has a pair of end plates 541 fixed to the distal end of the drive cylinder 52 and a pair of protrusions protruded forward of the end plate 541 and the upper end of the distal end is connected. And a swing block 543 hinged between the projecting end 542 and the pair of projecting end 542.

In addition, the high frequency heat treatment apparatus 100 according to the embodiment of the present invention forms a cutout 531 in the cradle 53, protrudes upward while penetrating the cutout 531, and supports cradle 53. And may be further provided with a latch 532 is hinged and swinging.

Hereinafter, the step-by-step operating state of the ejector unit 50 will be described with reference to FIG. 10.

(a) First, the material 1 heated in the high frequency heating unit 30 is transferred to one side by using the ejector unit conveyor 51.

(b) When the conveyed material 1 is in contact with one side of the rocking block 543 of the ejector head bundle 54, the rocking block 543 hinged between the protruding ends 542 is the conveying direction of the material 1. Is rocking. This reduces the speed of the material 1 in the advancing direction.

(c) The material 1 decelerated while passing through the ejector head bundle 54 is seated on the upper portion of the holder 53, and is not provided with a separate conveyor on the holder 53, thereby maintaining a pause state.

(d) Preferably, the locking portion 532 is further provided to form a cutout 531 on the cradle 53 and protrude upward through the cutout 531 to be hinged with the cradle 53 to swing. By doing so, it is preferable to allow the material 1 to be positioned at a certain point on the holder 53.

(e) The paused material 1 is transferred into the cooling chamber 41 by the swing block 543 of the ejector head bundle 54 by the operation of the drive cylinder 52. This is possible because the upper end portions of the pair of protruding ends 542 are connected to each other, so that the swinging block 543 swings only in the conveying direction of the material.

Therefore, the high frequency heat treatment apparatus 100 according to the present invention further includes a feeder unit control unit 22 and an ejector unit 50, thereby preventing a delay in work speed and a decrease in productivity due to the alignment and transfer of materials by hand. And it has the advantage of automating the whole process of heat treatment.

As described above, the high frequency heat treatment apparatus 100 according to the present invention enables uniform movement while simultaneously rotating the material 1 to be heat treated in the cooling chamber 41 provided with the injection nozzle 42. In addition to obtaining a depth of hardening, there is an advantageous effect that productivity is greatly improved due to continuous heat treatment. Further, the feeder control unit 22 and the ejector unit 50 are further provided to delay the work speed and productivity by manual operation. There is an advantage that can prevent the degradation of and to automate the entire process of heat treatment.

100: high frequency heat treatment apparatus 1: material
10: feeder portion 11: support frame
12: fixed base 13: platform
14: hydraulic cylinder 20: transfer unit
21: conveyor 22: feeder unit control unit
221: support 222: weight
223 sensor 30 high frequency heating unit
40: cooling unit 41: cooling chamber
42: injection nozzle 43: feed roll
44: cooling unit conveyor 45: transfer bracket
46: drive roll 47: support roll
50: ejector unit 51: ejector unit conveyor
52: driving cylinder 53: holder
531: incision 532: hook
54: ejector head bundle 541: end plate
542: protrusion 543: rocking block

Claims (7)

Feeder unit for continuously supplying the material to be heat treated; And
A transfer unit having a conveyor on which material supplied through the feeder unit is seated;
A high frequency heating unit for applying heat to the material transferred through the transfer unit; And
It comprises a; cooling unit for cooling the material heated by the high frequency heating unit;
In the cooling unit,
A cooling chamber provided with an oil inlet / outlet of the heated material, a plurality of spray nozzles installed in an upper portion of the cooling chamber, and spraying cooling water to the heated material, and installed in pairs facing each other from a lower portion of the cooling chamber; A transfer roll which is engaged with the driving means and rotates the heated material seated on the upper portion in one direction, and a transfer bracket installed at a lower portion of the transfer roll and protruding upward in a space between the pair of transfer rolls; High frequency heat treatment apparatus, characterized in that the fixed cooling unit conveyor is provided.
The method of claim 1,
The driving means includes:
And a pair of drive rolls engaged with one end of each of the pair of feed rolls and fastened with an external driving source to impart rotational force to the feed rolls.
The method according to claim 1 or 2,
High frequency heat treatment apparatus characterized in that the irregularities in the longitudinal direction of the feed roll is formed on the outer periphery of the feed roll.
The method of claim 1,
The feeder
A support frame fixed to the ground, a plurality of fixtures fixedly installed on the support frame and spaced apart by varying the installation height of the upper end inclined in the material supply direction, and ascending and descending in respective spaces of the fixture; It consists of a plurality of platform,
The lifting device is disposed at the foremost end of the material supply direction, so that the material is continuously transferred in the material supply direction by the lifting motion of the platform.
The method of claim 4, wherein
In the upper portion of the conveyor provided in the transfer unit,
A support fixed to the ground, a weight hinged with the support and being in contact with an end of the material conveyed by the conveyor, a sensor for detecting the movement of the weight, and the lifting platform using information of the sensor High frequency heat treatment apparatus, characterized in that the feeder unit control unit further comprises a controller for controlling the operation.
The method of claim 1,
In front of the cooling unit,
An ejector part conveyor configured to transfer the heated material, a drive cylinder fixed to the upper part of the ejector part conveyor, and an ejector part disposed to be spaced apart from the ejector part conveyor and communicating with an inlet of the cooling chamber; Equipped,
At the distal end of the drive cylinder,
The ejector head bundle includes a pair of protrusions protruding forward of the end plate and the upper end of the end plate, and a rocking block hinged between the pair of protrusions and the pair of protrusions. High-temperature heat treatment apparatus characterized in that the heated material conveyed by the conveyor is temporarily suspended in the upper portion of the cradle using the ejector head bundle, and then the heated material is transferred to the cooling unit by the driving cylinder.
The method of claim 6,
The cradle is provided with a cutout, high frequency heat treatment apparatus characterized in that it is further provided with a hook that protrudes upwards while penetrating the cutout is hinged to the cradle and swing.

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