KR100752224B1 - High frequency heat treatment apparatus for shaft - Google Patents

Abstract

An equipment for heat treatment of a shaft by a high frequency induction heating method is provided to simplify the process by making it possible to perform partial high frequency heat treatment of the shaft continuously, improve the production efficiency by increasing the working speed, and increase product accuracy by disposing the shaft horizontally, thereby reducing the deformation of the shaft in a length direction of the shaft. An equipment for heat treatment of a shaft by a high frequency induction heating method comprises: a main frame member(100); a product rotating member(10) which is installed on an upper part of the main frame member, and includes a pair of first roller parts(11) and a pair of second roller parts(13); a drive member installed on the main frame member to rotate the first and second roller parts in one direction; an automatic product feeding member(30) disposed at one side of the first roller parts to sequentially feed products to a space between the first roller parts; a product transfer member including a pair of pulley parts, a drive means, a chain par, and at least two transfer projections; a high frequency induction heating member(50) including a body part(51), a high frequency coil part(53), a coil cooling part, and a plurality of shaft cooling parts; first to third proximity switches(60,70,80) respectively installed at one side of the chain part to generate a high frequency current in the high frequency coil part, release the high frequency current generated in the high frequency coil part, and allow the automatic product feeding member to feed the products by sensing approach of the transfer projections; and a product collecting member(90) installed at one side of the second roller parts to collect high frequency heated products.

Description

High frequency heat treatment apparatus for shaft

1 is a front view showing a high frequency induction heating method of the shaft heat treatment apparatus according to an embodiment of the present invention.

2 is a plan view of FIG.

3 a and b are cross-sectional views schematically illustrating the operation of the automatic product supply member of FIG.

Figure 4 a, b, c, d is a front view showing for explaining the operation of the product conveying member of FIG.

5 is an enlarged perspective view of the high frequency induction heating member of FIG.

FIG. 6 is an enlarged perspective view of the high frequency coil unit of FIG. 5; FIG.

7 is a conceptual diagram showing a conventional high frequency heat treatment apparatus.

<Explanation of symbols for main parts of the drawings>

10: product rotating member 11: the first roller portion

13 second roller portion 20 drive member

21: motor 22: drive pulley

23: driven pulley 24: belt

25: rotating shaft 30: product automatic supply member

31: supply box 32: inclined portion

33,34: partition 35: hydraulic cylinder

40: product transfer member 41: pulley

45: chain portion 47: feed projection

50: high frequency induction heating member 51: main body

53: high frequency coil unit 55: coil cooling unit

57: shaft cooling unit 60: first proximity switch

70: second proximity switch 80: third proximity switch

90: product collecting member 91: drop chute

93: loading box 100: main frame member

110: moving wheel S: shaft

The present invention relates to a high frequency induction heating type heat treatment apparatus of a shaft.

In general, a vehicle includes a valve opening and closing mechanism for opening and closing a valve for an intake stroke and an exhaust stroke inside an engine, and in the case of an overhead valve mechanism, an upper end of a push rod which is normally moved up and down by a cam of a cam shaft and One side is in contact with the other end of the rocker arm formed to contact the top cap of the valve rotates around the rocker arm shaft fixed to the upper side of the cylinder block of the engine to form a structure in which the opening of the valve is made. The rocker arm shaft is partially heat treated using a high frequency heat treatment method to harden the surface of the rocker arm to which the rocker arm is coupled.

 High frequency and medium frequency heat treatment is a surface hardening heat treatment which selectively hardens a part of a part, and is a heat treatment method used to obtain heat treatment characteristics of a specific part or to be concerned about deformation. In other words, by heating the surface of the object to be heated to the hardening temperature according to the material properties by using a high frequency induction heating method and rapidly cooling with water or oil, the surface of the mechanical structural component is hardened to improve wear resistance and mechanical properties.

As a device for high-frequency heat treatment of various shafts, including the rocker arm as described above, it is presented in the conventional "Priority jig for high frequency heat treatment" of Korean Utility Model Publication No. 20-0403975. According to the above publication, the high-frequency heat treatment apparatus, as shown in Figure 7, the jig 110 provided in the frame 100 and the workpiece to simultaneously fix the frame 100, the workpiece (T) up and down at the same time, A heating coil 120 for heating (T) and a cooling device 130 for rapidly cooling the heated workpiece. Here, the heating coil 120 and the cooling device 130 are subjected to a high frequency heat treatment to the workpiece (T) while moving up and down by a transfer device provided in the frame or configured separately.

However, the above-described high frequency heat treatment apparatus has the following problems.

As described above, the high frequency heat treatment apparatus for high frequency heat treatment of rocker arm shafts used in automobiles or rocker arm shafts applied to all transmissions such as motorcycles or farm equipment should be set once and then released after high frequency heat treatment, and then set again to perform high frequency heat treatment. That is, there is a disadvantage that the heat treatment process is not made continuously, work speed is low, production efficiency is lowered.

In addition, the shaft is disposed vertically during the high frequency heat treatment process, there is a disadvantage that the deformation can be made in the longitudinal direction of the shaft during the high frequency heat treatment.

The present invention has been made to solve the above-mentioned problems, the process is simplified because the partial high frequency heat treatment of the shaft can be continuously, the work speed can be improved and the production efficiency can be improved, the shaft is arranged horizontally the shaft It is an object of the present invention to provide a high frequency induction heating type heat treatment apparatus of a shaft which can reduce the deformation in the longitudinal direction by more than half, thereby increasing the precision of the product.

High frequency induction heating method of the shaft of the present invention for achieving the above object, the main frame member; A pair of first roller parts provided on an upper portion of the main frame member and arranged to be parallel to each other, and a pair of first roller parts disposed to face each other at a predetermined interval in a longitudinal direction of the first roller part; A product rotating member including two roller parts; A driving member provided on the main frame member to rotate the first and second roller parts in one direction; A product automatic supply member disposed on one side of the first roller part to supply products one by one so that the product is located between the pair of first roller parts; A pair of pulleys respectively disposed at predetermined intervals between the first roller portions, a driving means for rotating the pulley portion, a chain portion wound around the pulley portion, and fixed to an upper surface of the chain portion, Arranged so as to protrude between the first roller portion, composed of at least two or more spaced apart from each other, by pushing the one side of the product located between the first roller portion as the chain portion moves by the rotation of the pulley portion Product transfer member comprising a transfer projection for moving the; The main body is provided on one side of the product rotating member, and is installed on one side of the main body, disposed between the first roller and the second roller, the product penetrates into the interior, the electrical signal of the main body By a high frequency current generated by the high-frequency current through the product flows through the induction current to the high frequency coil portion, and a coil cooling unit provided inside the high frequency coil portion to cool the flow of coolant flows therein And a high frequency induction heating member including a shaft cooling unit provided in plural along the inner circumference of the high frequency coil unit and cooling water injected therethrough to cool the product penetrating into the high frequency coil unit. A first proximity switch provided at one side of the chain part and configured to detect when the transfer protrusion is close as the chain part moves to generate a high frequency current in the high frequency coil part; A second proximity switch provided at one side of the chain part and configured to detect when the transfer protrusion is close as the chain part moves to release a high frequency current generated in the high frequency coil part; A third proximity switch provided at one side of the chain part and configured to detect when the transfer protrusion is close as the chain part moves so that the product automatic supply member supplies the product; And a product collecting member provided at one side of the second roller part to collect the high frequency heated product.

Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 is a front view showing a high frequency induction heating type heat treatment apparatus of a shaft according to a preferred embodiment of the present invention, Figure 2 is a plan view of Figure 1, Figure 3 a, b is the operation of the automatic product supply member of Figure 1 4 is a front view illustrating the operation of the product transfer member of FIG. 1, and FIG. 5 illustrates the high frequency induction heating member of FIG. 1. 6 is an enlarged perspective view, and FIG. 6 is an enlarged perspective view of the high frequency coil unit of FIG. 5.

1 and 2, the high frequency induction heating type heat treatment apparatus of the shaft of the present embodiment is the main frame member 100, the product rotation member 10, the drive member 20 and the product automatic supply member 30 And a product transfer member 40, a high frequency induction heating member 50, a first proximity switch 60, a second proximity switch 70, a third proximity switch 80, and a product collection member 90.

The lower portion of the main frame member 100 is provided with a plurality of moving wheels 110 to facilitate movement.

The product rotating member 10 includes a pair of first roller parts 11 and a pair of second roller parts 13.

The pair of first roller parts 11 are provided on the main frame member 100 and are arranged in parallel with each other.

A pair of second roller portion 13 is provided on the upper portion of the main frame member 100, and arranged to face each other at a predetermined interval in the longitudinal direction of the first roller portion 11 at a predetermined interval. It is.

The driving member 20 is provided on one side of the main frame member 100 to rotate the first and second roller parts 11 and 13 in one direction.

In this embodiment, the drive member 20 is comprised by the motor 21, the drive pulley 22, the driven pulley 23, the belt 24, the rotating shaft 25, etc.

In detail, the motor 21 is provided on one side of the main frame member 100, and the rotating shaft 25 passes through the first roller portion 11 and the second roller portion 13, which are disposed to face each other. It is prepared.

In addition, a driving pulley 22 and a driven pulley 23 are connected to one end of the motor shaft and one end of the rotating shaft 25, respectively, and a belt 24 wound around each driving pulley 22 and the driven pulley 23 is provided. It is prepared.

As a result, the first roller part 11 and the second roller part 13 are rotated by the driving of the motor 21.

The product automatic supply member 30 is disposed on one side of the first roller portion 11, and supplies the products one by one so that a product such as a shaft is positioned between the pair of first roller portions 11.

In this embodiment, the automatic product supply member 30, as shown in Figure 3, is composed of a supply box 31, the partition 33, 34, the hydraulic cylinder 35 and the like.

In detail, the supply box 31 is disposed on one side of the first roller part 11, and a plurality of products S are stacked, and one side of the supply box 31 is inclined, and one end is formed. The inclination part 32 located in the upper part between 1 roller part 11 is provided. In addition, the bottom surface of the supply box 31 is preferably configured to be slightly inclined so that the product (S) can move to the inclined portion (32) for smooth product supply.

At least one partition 33 or 34 is provided and disposed across the supply box 31.

One end of the piston of the hydraulic cylinder 35 is connected to the partitions 33 and 34, and the partitions 33 and 34 are movable up and down the supply box 31 in accordance with the operation of the piston.

The automatic product supply member 30 configured as described above, when the piston of the hydraulic cylinder 35 moves downward, as shown in b of FIG. 3, the partitions 33 and 34 are also included in the supply box 31. At this time, one of the products (S) loaded in the supply box 31 is moved to the inclined portion (32). The product S moved to the inclined portion 32 is moved between the first roller portions 11 by the inclined surface of the inclined portion 32 so that the product S is supplied.

The product conveying member 40 includes a pair of pulleys 41, a driving means (not shown), a chain part 45, and a conveying protrusion 47.

The pair of pulleys 41 are disposed at predetermined intervals in the lower portion between the first roller portions 11.

The driving means (not shown) rotates the pair of pulleys 41 and may be a motor or the like although not shown in the drawings of the present specification. In addition, in this embodiment, since the product moves from the left side to the right side of the drawing, the driving means rotates the pulley part 41 clockwise.

The chain part 45 is wound around the pair of pulley parts 41.

The transfer protrusion 47 is fixed to the upper surface of the chain portion 45, and is arranged to protrude between the first roller portion (11).

In addition, the transfer protrusion 47 is preferably composed of at least two or more spaced apart from each other.

In this embodiment, the transfer protrusion 47 is composed of two, but this is only one embodiment, the number of the transfer protrusion 47 may vary depending on the length of the chain portion 45 and the time interval at which the product is supplied. Of course.

Looking at the operation of the product transport member 40 configured as described above, as shown in Figure 4a, when the product (S) is supplied between the first roller portion 11 from the automatic product supply member 30, the pulley The chain part 45 is moved in the clockwise direction on the drawing by the rotation of the part 41. At this time, the feed protrusion 47 is moved to the first roller part 11 while the feed protrusion 47 is moved clockwise together. The product S is moved from the left side to the right side by pushing the rear side of the product S located in between. In addition, the product S moving by the transfer protrusion 47 pushes the rear side of the product located in front of the product S, so that the product S moves from left to right.

As shown in FIG. 5, the high frequency induction heating member 50 includes a main body portion 51, a high frequency coil portion 53, a coil cooling portion 55, and a shaft cooling portion 57.

The main body 51 is provided on one side of the product rotating member 10.

The high frequency coil part 53 is installed at one side of the main body part 51, and is disposed between the first roller part 11 and the second roller part 13.

The product S penetrates into the high frequency coil part 53, and a high frequency current is generated by the electrical signal of the main body part 51 so that an induced current flows into the product S penetrating therein so as to be heated at high frequency. do.

The coil cooling unit 55 is provided inside the high frequency coil unit 53, and both ends of the coil cooling unit 55 are each connected with a hose H, and the coolant is supplied to the coil cooling unit 55 through the hose H. ) Is supplied to the cooling water flows into the cooling water and the high frequency coil part 53 is cooled and then discharged through the opposite hose.

The shaft cooling unit 57 is provided in plural along the inner circumference of the high frequency coil unit 53, and the outermost both ends of the shaft cooling unit 57 are connected with hoses H ', respectively, and the hoses H'. Cooling water is sprayed through to cool the product S penetrating into the high frequency coil part 53.

In the present embodiment, since the product S is moved from the left to the right of the figure by the product transfer member 40, the shaft cooling unit 57 so that the product S heated by the high frequency coil unit 53 can be cooled. As shown in FIG. 6, the coolant is injected at about 45 ° toward the high frequency coil portion 53 in the right direction to the high frequency coil portion 53.

The first proximity switch 60 is provided on one side of the chain part 45, as shown in b of FIG. 4, and detects when the transfer protrusion 47 approaches as the chain part 45 moves, thereby detecting a high frequency. The high frequency current is generated in the coil portion 53.

The first proximity switch 60 is a switch that detects the presence or absence of a detection object by a non-contact type switch, which is typically a non-contact mechanical switch such as a micro switch or a limit switch. do. In general, when a metal body approaches or exists near the detection coil, the inductance of the detection coil changes as the induced current flows in the metal body due to the electromagnetic induction, and the oscillation amplitude and the oscillation frequency are detected to generate an output signal. .

The second proximity switch 70 is provided on one side of the chain portion 45, as shown in Figure 4c, as the chain portion 45 is moved as the transfer projection 47 is detected by detecting the high frequency The high frequency current generated in the coil unit 53 is released.

Third proximity switch 80 is provided on one side of the chain portion 45, as shown in Figure 4d, as the chain portion 45 is moved as the transfer projection 47 is detected by detecting the product Automatic supply member 30 to supply the product.

In the present embodiment, the first, second, and third proximity switches 60, 70, and 80 are sequentially positioned below the chain portion 45, and the transfer protrusion 47 sequentially rotates as the chain portion 45 moves. 2,3 close proximity to the switch (60, 70, 80) and a high frequency current is generated in the high frequency coil unit 53, the generated current is released, the product automatic supply member 30 supplies the product (S) Done. The arrangement of the first, second, and third proximity switches 60, 70, and 80 is just one embodiment, and may vary depending on the embodiment.

The product collecting member 90 is provided on one side of the second roller portion 13, and the high frequency heated product S is collected.

In this embodiment, the product collecting member 90 is composed of an inclined drop chute 91 and a stacking box 93 in which the product S is collected.

Hereinafter, the operation of the embodiment of the present invention having the above-described configuration will be described.

First, the product S is sequentially supplied by the product automatic supply member 30 so as to be positioned between the first roller parts 11.

Referring to the operation of the automatic product supply member 30, as shown in b of Figure 3, when the piston of the hydraulic cylinder 35 is moved to the bottom, the partitions 33, 34 together with the lower part of the supply box 31 At this time, one of the products (S) loaded in the supply box 31 is moved to the inclined portion (32). The product S moved to the inclined portion 32 is moved between the first roller portions 11 by the inclined surface of the inclined portion 32 so that the product S is supplied.

The product S supplied between the first roller parts 11 is moved from the left to the right on the drawing by the product transfer member 40.

In detail, as shown in FIG. 4A, the product S located between the first roller parts 11 has the chain part 45 rotated clockwise on the drawing by the rotation of the pulley part 41. In this case, while the feed projections 47 move together in a clockwise direction, the feed projections 47 push the rear side of the product S positioned between the first roller portions 11 so that the product S is from the left side. To the right. In addition, the product S moved by the transfer protrusion 47 pushes the rear side of the product S located in front of the product S, so that the product S continuously moves from left to right.

After the feed projection 47 is rotated to some extent, the product S is supplied between the first roller portions 11 by the product automatic supply member 30 again, and the product is moved by the movement of the other feed protrusion 47. S moves forward.

The product S moved to the front penetrates into the inside of the high frequency coil part 53, and a high frequency current is generated by the electrical signal of the main body part 51, and an induced current flows into the product S penetrating therein. Allow for high frequency heating.

In this case, since the first and second roller parts 11 and 13 are continuously rotated, the product positioned above the first and second roller parts 11 and 13 is continuously rotated and thus the product penetrates into the high frequency coil part 53. S) can be heat treated evenly.

The product S passing through the high frequency coil part 53 is collected by the product collecting member 90 via the second roller part 13.

In the above, the operation of the high-frequency induction heating member 50 and the automatic product supply member 30 is controlled by the first, second, third proximity switch (60, 70, 80).

That is, as shown in b, c, d of Figure 4, in accordance with the movement of the chain portion 45, the transfer projection 47 is in close proximity to the first, second, third proximity switch (60, 70, 80) A high frequency current is generated in the high frequency coil unit 53, the generated current is released, and the product automatic supply member 30 supplies the product S.

As described above, since the high frequency heat treatment of the product (S) is possible continuously, the process is simplified, and the working speed is increased, thereby improving production efficiency.

In addition, since the product (S) is arranged horizontally during the high-frequency heat treatment process, the deformation in the longitudinal direction of the shaft (S) is reduced by more than half can increase the accuracy of the product.

As described above, although described with reference to a preferred embodiment of the present invention, those skilled in the art various modifications of the present invention without departing from the spirit and scope of the invention described in the claims below. Or it may be modified.

According to the high frequency induction heating method heat treatment apparatus of the shaft of the present invention as described above has the following effects.

First, the partial high frequency heat treatment of the shaft is possible continuously, the process is simplified, the working speed is faster, the production efficiency can be improved.

Second, since the shaft is horizontally disposed during the high frequency heat treatment process, the deformation in the longitudinal direction of the shaft is reduced by more than half, thereby increasing the precision of the product.

Claims (1)

In the high frequency induction heating method of the shaft, Mainframe members; A pair of first roller parts provided on an upper portion of the main frame member and arranged to be parallel to each other, and a pair of first roller parts disposed to face each other at a predetermined interval in a longitudinal direction of the first roller part; A product rotating member including two roller parts; A driving member provided on the main frame member to rotate the first and second roller parts in one direction; A product automatic supply member disposed on one side of the first roller part to supply products one by one so that the product is located between the pair of first roller parts; A pair of pulleys respectively disposed at predetermined intervals between the first roller portions, a driving means for rotating the pulley portion, a chain portion wound around the pulley portion, and fixed to an upper surface of the chain portion, Arranged so as to protrude between the first roller portion, composed of at least two or more spaced apart from each other, by pushing the one side of the product located between the first roller portion as the chain portion moves by the rotation of the pulley portion Product transfer member comprising a transfer projection for moving the; The main body is provided on one side of the product rotating member, and is installed on one side of the main body, disposed between the first roller and the second roller, the product penetrates into the interior, the electrical signal of the main body By a high frequency current generated by the high-frequency current flows through the product flowing through the induction coil portion and the coil cooling unit for cooling the high-frequency coil portion is provided inside the high-frequency coil portion to coolant flows therein And a high frequency induction heating member including a shaft cooling unit provided in plural along the inner circumference of the high frequency coil unit and cooling water injected therethrough to cool the product penetrating into the high frequency coil unit. A first proximity switch provided at one side of the chain part and configured to detect when the transfer protrusion is close as the chain part moves to generate a high frequency current in the high frequency coil part; A second proximity switch provided at one side of the chain part and configured to detect when the transfer protrusion is close as the chain part moves to release a high frequency current generated in the high frequency coil part; A third proximity switch provided at one side of the chain part and configured to detect when the transfer protrusion is close as the chain part moves so that the product automatic supply member supplies the product; And Is provided on one side of the second roller portion, the product collection member for collecting the high-frequency heated products; high frequency induction heating method of the shaft comprising a.

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