JPH06306477A - High frequency moving quenching method for lengthy work - Google Patents

Abstract

PURPOSE:To save handling time for quenching, to shorten quenching time for all the works and to reduce fluctuation in the length of non-quenched parts of end parts of works short in a high frequency moving quenching method by which end parts of many lengthy works having a specific length such as pipes are left as non-quenched. CONSTITUTION:After a lengthy work 3 whose length is longer than L is heated by a heating coil 4 and continuously moving quenched with quenching liquid Q sprayed from a jacket 5, the work 3 is cut into plural lengthy works 100 whose length is L respectively. The cur work 100 are inserted between the screw threads 11 and 21 of square screws 10 and 20 and arranged in the orthogonal direction to the longitudinal direction of them so that whose one end parts 101 are on the same line and the end parts 101 are passed in a heating coil 50 to be tempered by moving heating. Then, another end parts 102 are passed in a heating coil 60 to be tempered by moving heating.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-frequency transfer quenching method in which end portions of a plurality of long workpieces having a predetermined length are not quenched.

[0002]

2. Description of the Related Art For the purpose of explaining the prior art, the peripheral surface of a pipe 100, which is cut into a length L whose longitudinal section is shown in FIG.
The case where the pipe 100 is quenched by leaving one end portion 101 having a length L1 from one end 101a and the other end portion 102 having a length L2 from the other end 102a will be described. In such a case, it is general practice to subject the portions of the pipe other than both end portions 101, 102 to moving quenching.

That is, the pipe 100 is an annular high-frequency heating coil (hereinafter, the high-frequency heating coil is also simply referred to as a heating coil).
After being inserted into the heating coil, a high-frequency current is passed through the heating coil, and the pipe 100 is longitudinally moved at an appropriate speed, for example
It is moved at 8 m / min, and the quenching liquid is jetted from the jackets juxtaposed to the heating coil onto the peripheral surface of the heated pipe 100 to cool it. At this time, one end 101 and the other end of the pipe 100
When the heating coil passes through 102, the power supply to the heating coil is stopped. Of course, instead of moving the pipe 100, the heating coil and jacket may be moved. An example of lengths L, L1 and L2 is 110 cm each.
, 12 cm, 11 cm.

[0004]

However, in the above moving quenching method, when quenching a large number of pipes 100 having a length L, each of the pipes 100 is quenched before quenching. Since it must be installed in the equipment and removed from the quenching equipment after quenching, it is extremely troublesome and the next pipe 100
In order to quench, it is necessary to return the supporting device (or heating coil) of the pipe 100 to the original quenching start position.
This is one of the causes of the long quenching time of 100. In addition, the pipe 100 that has been transfer-quenched in this way has
The lengths L1 and L2 of the unquenched portions 101 and 102 tend to vary.

The present invention was devised in view of the above circumstances, and a high-frequency moving quenching method in which the end portions of a large number of long workpieces such as pipes having a predetermined length are unquenched. In order to reduce the time required for quenching work and shorten the quenching work time for the entire workpiece, a high-frequency transfer quenching method with less variation in the length of the unquenched part at the end is provided. The purpose is to do.

[0006]

In order to solve the above-mentioned problems, the present invention provides a high-frequency moving quenching method in which the end portions of a plurality of long workpieces having a predetermined length are unquenched. After continuously moving and quenching a long work having a length equal to or longer than the length, the work is cut into a plurality of works having a predetermined length, and then the plurality of cut works are cut in a direction perpendicular to the longitudinal direction of the work. Moreover, the end portions are arranged side by side so that they are aligned, and then the end portions are annealed by moving and heating.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the method of the present invention will be described below with reference to the drawings. As the long work, the pipe 100 shown in FIG.
For each of 100, one end 101 of length L1
Further, an unquenched portion having a length L2 is left on the other end portion 102.

1 to 3 are drawings for explaining the present embodiment, FIG. 1 is a block diagram of an induction hardening apparatus capable of realizing the method of the present embodiment, and FIG. 2 is a schematic view of a heating coil. 1 is a perspective view, FIG. 3 is a cross-sectional view taken along the line XX of FIG. 1, FIG. 4 is a cross-sectional view taken along the line YY of FIG. 1, and FIG. 5 is a vertical cross-section of a pipe taken as a long work. It is a figure.

As shown in FIG. 1, when a wound sheet-shaped metal plate 1 (for example, a steel plate) of an appropriate length is unwound and fed into the pipe-making machine 2, the pipe-making machine 2 receives the sheet-like metal. Board 1
After bending so that both ends of the pipe contact each other, both ends are connected by welding to form a pipe 3, and the pipe 3 is continuously fed at a speed of, for example, 80 m 2 / min. While the pipe 3 is continuously moved in the direction of arrow A, it is heated by the annular heating coil 4, and then the quenching liquid Q is injected from the annular jacket 5 so that the entire circumferential surface of the pipe 3 is A hardened layer is continuously formed.

After this, the cutter 6 rotated by the motor 7 starts to move forward by the cutter forward / backward movement device 8 to start cutting the pipe 3, and at the same speed as the movement speed of the pipe 3 by the horizontal cutter movement device 9. It is moved in the direction of arrow A. Then, when the tip portion of the pipe 3 reaches the position shown by the dotted line, the cutting of the pipe 3 is completed, and one pipe 100 having a length L is completed. At the same time when the cutting of the pipe 3 is completed, the cutter 6 is rapidly returned to its original position by the cutter lateral moving device 9 and the cutter forward / backward moving device 8, and then the next cutting is started. Of course, the cutter lateral movement device 9 is controlled so that the cutting length of the pipe 3 by the cutter 6 becomes L.

A pipe 100 having a length L that has been cut and completed
Starts to fall from the end of cutting and then falls onto the inclined chute 71, and enters the first work annealing mechanism 110 which anneals one end portion 101 of the pipe 100. The first baking work annealing mechanism 110 includes a pair of square screws of the same shape in which the threads 11 and 21 of the same shape are respectively formed and arranged in parallel and horizontally.
Bearings that support 10 and 20 and one ends of square screws 10 and 20, respectively.
12, 22, and bearings 13, 23 that respectively support the vicinity of the other end,
Gears 14, 24 respectively attached to the other end, and gears 14,
The gear 15 meshing with the 24 and a motor for rotating the gear 15
16 and a workpiece contact member arranged in parallel with the square screws 10 and 20.
72 and a heating coil 50 supported by a supporting device (not shown).

A specific point on the surface of the square screw 10 (for example, the highest point of the screw thread 11 of a certain portion) and a specific point of the square screw 20 corresponding to this specific point are Square screws 10, 20 are attached to the gears 14, 24, respectively, so that they are on one plane orthogonal to the longitudinal direction.

As shown in FIGS. 2 and 3, a heating coil 50
Is one end 10 of the pipe 100 that advances over the square screws 10, 20.
Above 1 and in the direction of arrow D (square screw 10,
Parallel heating conductors 51-53 arranged in the longitudinal direction of 20),
Below the one end portion 101, the heating conductors 54 to 56 are arranged so as to be parallel and opposed to the heating conductors 51 to 53, respectively.
And the heating conductors 51, 54 at one end, the heating conductors 52, 55 at one end, and the heating conductors 53, 56 at one end, respectively, and the U-shaped heating conductors 51a to 53a, and the other heating conductors 52, 54. It is provided with U-shaped heating conductors 52b and 53b for connecting the ends and the heating conductors 53 and 55 to each other. The other end of the heating conductor 51 and the other end of the heating conductor 56 are connected to the input terminals 50a and 50b of the heating coil 50, respectively.

As shown in FIG. 1, the pipe 100 rolls down on the slanted chute 71 in the direction of arrow C, and the thread of the square screw 10 is threaded.
Insert between 11 and 11 and between the threads 21 and 21 of the square screw 20. As shown in FIG. 4, since the square screws 10 and 20 are rotated in the direction of the arrow M by the motor 16, the screw threads 11 and 21 advance in the direction of the arrow D. Therefore, the pipe 100 sandwiched between the threads 11, 11 and the threads 21, 21 is also indicated by the arrow D.
Proceed in the direction of.

On the other hand, the other end 102a of the pipe 100 is always in contact with the work contact member 72 erected at the end of the base 70 by the rotation of the square screws 10, 20 in the direction of the arrow M. Due to such a force, the pipe 100 does not move in the longitudinal direction of the pipe 100 while moving in the direction of the arrow D.

When the one end portion 101 of the pipe 100 passes through the heating coil 50, the one end portion 101 is heated and annealed. While the pipe 100 is moving in the direction of the arrow D, the rotating threads 11 and 21 come into contact with the outer peripheral surface of the pipe 100, so that the pipe 100 receives a rotational force about its longitudinal direction. Since it is rotating gently,
When annealed by the heating coil 50 as described above, it is annealed uniformly.

When the pipe 100 passes through the heating coil 50 and reaches the position where the work contact member 72 is not present, the square screws 10 and 20 are still rotating in the direction of arrow M, and therefore in the direction of arrow E. It moves and advances on a number of rotating rollers 74. Since a pair of fences 73 are provided on both sides of the roller 74,
The pipe 100 will not jump out of the roller 74. The pipe 100 advanced by the rollers 74 rolls down in the direction of arrow G on the chute 75 after the other end 102a collides with the work contact member 76 of the chute 75 that is inclined downward in the direction of arrow G. Enters the workpiece annealing mechanism 120.

The second workpiece annealing mechanism 120 includes square screws 10, 20, bearings 12, 13, 22, 23, and gears 14, 1 on which the threads 11, 21 of the first workpiece annealing mechanism 110 are formed, respectively.
5, 24, the motor 16, the heating coil 50, and the workpiece contact member 72, square screws 30, 40, bearings 32, 33, 42, 43, gears 34, in which the corresponding threads 31, 41 are formed, respectively. 3
5, 44, the motor 36, the heating coil 60, and the workpiece contact member 77 are provided.

In the second workpiece annealing mechanism 120, the direction in which the pipe 100 is advanced is the direction of arrow H, which is the opposite direction to the direction in the first workpiece annealing mechanism 110, so the rotation directions of the square screws 30, 40 are The direction of rotation of the square screws 10 and 20 is reversed. The pipe 100 is annealed by the heating coil 60 while advancing in the direction of arrow G while the one end 101a is in contact with the workpiece contact member 77. Then, when the work contact member 77 disappears, the pipe 10
0 descends on a chute 78 having a downward slope in the direction of arrow K and is conveyed to the next step.

In the above embodiment, the one end portion 10 of the pipe 100 is
Although the case where both 1 and the other end portion 102 are unquenched has been described, the present invention is not limited to this, and only one of the one end portion 101 and the other end portion 102 may be unquenched. That is, according to the moving quenching method of the present embodiment, like the conventional method, each long workpiece can be installed in the quenching apparatus before quenching and removed from the quenching apparatus after quenching. Since it does not take time and effort, the quenching work time for quenching the end portions of many long workpieces can be shortened, and there is little variation in the unquenched length of the end portions.

[0021]

As described above, according to the present invention, in the high-frequency moving quenching method in which the end portions of a plurality of long-length workpieces having a predetermined length are unquenched, the length of the work is not less than the predetermined length. After continuously moving and quenching a long work, it is cut into a plurality of works of the above-mentioned predetermined length, and then, the plurality of cut works are aligned in a direction perpendicular to the longitudinal direction of the work and the end portions are on a straight line. After arranging them side by side as shown in, the end parts are annealed by moving and heating.

Therefore, according to the method of the present invention, since the quenching and annealing operations are continuously performed during the moving quenching in which the end portions of a plurality of long workpieces having a predetermined length are not quenched, Therefore, the entire quenching time can be shortened and the variation in the unquenched length of the end portion can be reduced.

[Brief description of drawings]

FIG. 1 is a configuration diagram of an induction hardening apparatus that can realize a method according to an embodiment of the present invention.

FIG. 2 is a schematic perspective view of a heating coil of the induction hardening apparatus shown in FIG.

3 is a cross-sectional view taken along the line XX of FIG.

FIG. 4 is a cross sectional view taken along the line YY of FIG.

FIG. 5 is a vertical sectional view of a pipe taken as a long work.

[Explanation of symbols]

 4 Heating coil 5 Jacket 6 High speed cutter 8 Cutter forward / backward movement device 9 Cutter lateral movement device 10, 20, 30, 40 Square screw 11, 21, 31, 41 Screw thread 16, 36 Motor 72, 77 Work contact member 100 Long Work 101 One end part 101a One end 102 Other end part 102a Other end

Claims (1)

[Claims] 1. A high-frequency moving quenching method in which end portions of a plurality of long workpieces having a predetermined length are unquenched, and long workpieces having a length not less than the predetermined length are continuously moved and quenched. After entering, it is cut into a plurality of workpieces of the predetermined length, then, the plurality of cut workpieces are arranged in parallel with each other in the direction perpendicular to the longitudinal direction of the workpieces and the end portions are on a straight line, A high-frequency moving quenching method for long workpieces, characterized in that the edges are annealed by moving heating.