JP3499476B2 - Induction hardening equipment for shaft-shaped workpieces - Google Patents

Description

BACKGROUND OF THE INVENTION [0001] [Technical Field of the Invention The present invention relates <br/> the induction hardening NyuSo location of the shaft-like workpiece to be induction hardening the shaft-like workpiece. 2. Description of the Related Art This type of induction hardening apparatus for a shaft-shaped work is a work supporting mechanism for supporting the shaft-shaped work in a lateral direction and rotating the shaft-shaped work as a center, and a high-frequency heating apparatus for heating the shaft-shaped work. It has a heating coil, a cooling jacket for spraying a cooling liquid to a portion heated by the high-frequency heating coil, and a moving mechanism for moving the high-frequency heating coil along the axis of the shaft-shaped work. The high-frequency heating coil includes a pair of linear heating conductors opposed to each other with the shaft core interposed therebetween, one substantially semicircular arc-shaped conductor connecting the linear heating conductors, and a high-frequency heating coil. A pair of power supply conductors for connecting the heating coil to the high-frequency power source, and a pair of substantially quarter-arc-shaped quarter-arc conductors connecting the power supply conductor and the linear heating conductor are integrally formed. A so-called semi-open saddle coil is used. [0004] However, the above-mentioned conventional induction hardening apparatus for a shaft-shaped work has the following problems. That is, at the position where the heating is started and the position where the heating is ended, since the heating is mainly performed in the linear heating conductor portion, the hardened layer formed from other portions becomes shallower. This is because, at the position where heating is started, the linear heating conductor moves immediately due to the movement of the high-frequency heating coil, resulting in insufficient heating. In addition, even at the position where the heating is completed, the heating is similarly terminated when the linear heating conductor reaches the position. [0005] In order to solve such a problem, it is conceivable to extend the heating time between the position where heating is started and the position where heating is ended. However, such an extension of the heating time causes overheating of the position immediately before the position where the heating ends, and thus the hardened layer formed at the position where the heating is started and the position where the heating is ended has an appropriate depth. Even so, a new problem arises in that the hardened layer in other portions becomes too deep. The present invention has been made in view of the above circumstances, and it is possible to form a hardened layer having an appropriate depth at the position where the heating is started and the position where the heating is finished, similarly to other portions. It is an object of the present invention to provide an induction hardening device for a shaft-shaped workpiece that can be hardened. According to the present invention, there is provided an induction hardening device for a shaft-shaped work according to the present invention, wherein a high-frequency heating coil for heating the shaft-shaped work, and a coolant is supplied to a portion heated by the high-frequency heating coil. Cooling jacket to spray,
A moving mechanism for relatively moving the high-frequency heating coil and the shaft-shaped work along the axis of the shaft-shaped work, and a contact-separation moving mechanism for relatively moving the high-frequency heating coil and the shaft-shaped work toward and away from each other. Wherein the high-frequency heating coil has a linear heating conductor along the axis of the shaft-shaped work, and an arc-shaped heating conductor extending over the peripheral surface of the shaft-shaped work. At the start and end positions of the heating, the gap between the arc-shaped heating conductor portion and the peripheral surface of the shaft-shaped work is adjusted to an appropriate value by the contact / separation moving mechanism, and the linear heating conductor portion and the shaft-shaped The gap with the peripheral surface of the work is set to an appropriate value or more, and at positions other than the start and end positions of heating, the gap between the linear heating conductor and the peripheral surface of the shaft-shaped work is adjusted to an appropriate value by the contact / separation moving mechanism. Rutotomoni is to more than a proper value the gap between the arcuate heating conductor portion and the circumferential surface of the shaft-like workpiece. FIG. 1 is a schematic configuration diagram illustrating a schematic configuration of an induction hardening apparatus and an induction hardening method for a shaft-shaped work according to an embodiment of the present invention; FIG. 2 is a schematic configuration diagram illustrating a schematic configuration of an induction hardening apparatus and a method for induction hardening of a shaft-shaped workpiece according to an embodiment of the present invention, and FIG. 3 is a shaft configuration according to the embodiment of the present invention. FIG. 4 is a schematic configuration diagram illustrating a schematic configuration of an induction hardening device for a work and an induction hardening method. FIG. FIG. 5 is a schematic perspective view, and FIG. 5 is a schematic explanatory view showing a gap between a high-frequency heating coil and a shaft-like work of the high-frequency hardening device for a shaft-like work according to the embodiment of the present invention. An induction hardening device for a shaft-shaped work according to an embodiment of the present invention includes a high-frequency heating coil 100 for heating a shaft-shaped work W, and a high-frequency heating coil 10 for heating the shaft-shaped work W.
And a moving mechanism 3 for moving the high-frequency heating coil 100 along the axis WL of the shaft-shaped work W.
00 and a moving mechanism 400 for moving the high-frequency heating coil 100 toward and away from the shaft-shaped workpiece W. In addition, the induction hardening device for this shaft-shaped work
A work support mechanism 500 that supports the shaft-shaped work W in a horizontal direction and drives the shaft-shaped work W to rotate about the axis WL of the shaft-shaped work W is provided. First, a shaft-shaped work W to be subjected to induction hardening by an induction hardening device for a shaft-shaped work according to an embodiment of the present invention is, for example, one used as a main shaft of a lathe. This shaft-shaped work W is
The appropriate value of the gap between the heating conductor portions 120, 140, and 140 of the high-frequency heating coil 100 is a rod shape having an outer diameter of R. As shown in FIG. 4, the high-frequency heating coil 100 includes a pair of linear heating conductors 110, 110 opposed to each other with the axis WL of the shaft-shaped work W interposed therebetween. One heating conductor 120 having a substantially semicircular arc shape and connecting the high-frequency heating coil 10
0 is connected to a high-frequency power source (not shown), and a pair of substantially 1/4 arc-shaped connecting the power supply conductors 130, 130 and the linear heating conductors 110, 110 is provided. 1/4 arc-shaped heating conductors 140, 14
0 is a so-called semi-open saddle coil integrally formed. That is, the high-frequency heating coil 100 has two types of arcs, that is, a substantially semicircular arc-shaped heating conductor portion 120 and a pair of approximately 1/4 arc-shaped heating arc portions 140, 140. There is a heating conductor. In addition, the pair of linear heating conductors 110 of the high-frequency heating coil 100 are opposed to each other with an interval of 2G + R as shown in FIG. That is, when the rod-shaped shaft-shaped workpiece W is set between the pair of linear heating conductors 110, 110, the gap between each linear heating conductor 110, 110 and the shaft-shaped workpiece W is set to an appropriate value G. You can do it. The arc-shaped heating conductor 120 of the high-frequency heating coil 100 is formed in a substantially U-shape.
The inner diameter of the curved portion 121 of the arcuate heating conductor 120 is set to 2G + R as shown in FIG. That is, the shaft-shaped work W
Is set so that the gap between the curved portion 121 and the shaft-shaped workpiece W can be set to an appropriate value G. On the other hand, the interval between the pair of linear portions 122, 122 extending downward from the curved portion 121 is equal to the interval 2G + R between the pair of linear heating conductor portions 110, 110. Further, the pair of substantially 1/4 arc-shaped 1/4 arc-shaped heating conductor portions 140, 140 are also formed by the arc-shaped heating conductor portions 1 and 2.
As in the case of 20, the quarter curved portion 141 having a substantially quarter arc shape
And a pair of straight portions 142 extending downward from the quarter curved portion 141. Therefore, in the high-frequency heating coil 100, the pair of 1/4 arc-shaped heating conductors 140, 140 face each other, so that the pair of 1/4 arc-shaped heating conductors 140, 1
40 is substantially the same as the arc-shaped heating conductor 120. Therefore, the pair of 1/4 arc-shaped heating conductor portions 140, 140 are connected to the pair of 1/4 curved portions 141, 14 respectively.
As shown in FIG. 5 (A), the inner diameter of the portion consisting of
G + R is set. That is, the 湾 曲 curved portion 14
When the shaft-shaped work W is set in the portion composed of the shafts 1 and 141, the gap between the quarter curved portions 141 and 141 and the shaft-shaped work W can be set to an appropriate value G. On the other hand, the interval between the pair of straight portions 142, 142 extending downward from the quarter curved portions 141, 141 is equal to the interval 2G + R between the pair of linear heating conductor portions 110, 110. The high-frequency heating coil 100 is formed of a conductive square pipe such as copper. Then, in order to prevent overheating of itself, the coolant circulates inside. The high-frequency heating coil 1 constructed as described above
00 is moved along the shaft-shaped work W by the moving mechanism 300. As the moving mechanism 300,
For example, the feed screw 310, the slider 320 slid by the feed screw 310, and the feed screw 3
And a motor 330 for rotating the motor 10. The high-frequency heating coil 100 is attached to the slider 320, and the high-frequency heating coil 100 moves along the axis WL of the shaft-shaped work W by rotating the feed screw 310. The work supporting mechanism 500 supports the shaft-shaped work W in a lateral direction and drives the shaft-shaped work W to rotate about the axis WL of the shaft-shaped work W.
The work supporting mechanism 500 includes a chuck 510 that holds one end of the shaft-shaped work W,
10, a rotation drive unit 520 that rotates the drive unit 10, a support center 530 that faces the chuck unit 510 to support the other end of the shaft-shaped work W, and a moving unit that moves the chuck unit 510 and the support center 530 toward and away from each other. (Not shown). The cooling jacket 200 is configured to move as the high-frequency heating coil 100 moves. Specifically, it is provided behind three heating conductor portions 110, 120, and 140 of the high-frequency heating coil 100. On the inner surface of this cooling jacket 200,
A plurality of rearwardly facing injection holes (not shown) are provided, and the coolant is injected from these injection holes. The contact and separation moving mechanism 400, which is the most important point in the induction hardening apparatus for a shaft-shaped work according to the embodiment of the present invention, moves the high-frequency heating coil 100 toward and away from the shaft-shaped work W. is there. Specifically, the base 41 to which the moving mechanism 300 is attached
0 and a cylinder 420 for vertically moving the base 410 together with the moving mechanism 300. When the base 410 is raised, the pair of linear heating conductors 110 of the high-frequency heating coil 100 oppose each other with the axis WL of the shaft-shaped work W interposed therebetween. Gap becomes an appropriate value G, and the base 410
Is lowered, the gap between the arc-shaped heating conductor portion 120, the pair of ４ arc-shaped heating conductor portions 140, 140 and the peripheral surface of the shaft-shaped work W is set to an appropriate value G. That is, the contact / separation moving mechanism 400 brings the linear heating conductors 110, 110 close to the peripheral surface of the shaft-shaped work W, and makes the two types of arc-shaped heating conductors 120,
140, 140 can be separated from the peripheral surface of the shaft-shaped workpiece W, and the two types of arc-shaped heating conductors 12 can be separated.
Thus, the linear heating conductors 110, 110 can be separated from the peripheral surface of the shaft-shaped work W by bringing the 0, 140, 140 closer to the peripheral surface of the shaft-shaped work W. A description will be given of induction hardening of the shaft-shaped work W by the induction hardening apparatus for a shaft-shaped work thus configured. First, the shaft-shaped work W is supported by the chuck portion 510 and the support center 530 of the work support mechanism 500. At this time, the high-frequency heating coil 100
Since it is lifted to the highest position by the contact / separation moving mechanism 400, it does not become an obstacle for supporting the shaft-shaped work W. The high-frequency heating coil 100 is lowered by the moving mechanism 400. At this time, as shown in FIG. 1, a portion for starting heating of the shaft-shaped work W and a pair of １ ／
Curved portions 141, 14 of arcuate heating conductor portions 140, 140
The gap between them is set to an appropriate value G. in this case,
The gap between the pair of linear heating conductors 110 and 110 and the shaft-shaped work W is equal to or more than the appropriate value G.
In this case, the gap between the peripheral surface of the shaft-shaped work W and the curved portion 121 of the arc-shaped heating conductor 120 also has the appropriate value G. In this state, a high-frequency current is supplied from the high-frequency power supply to the high-frequency heating coil 100. Then, the portion where the heating of the shaft-shaped work W is started is heated mainly by the induction current caused by the high-frequency current flowing through the curved portions 141 of the quarter-arc-shaped heating conductor portions 140. When a predetermined time has elapsed from the supply of the high-frequency current, the moving mechanism 300 and the contact / separation moving mechanism 400 operate. That is, the moving mechanism 300 starts moving the high-frequency heating coil 100 along the axis WL of the shaft-shaped work W by driving the motor 330,
0 means that the high-frequency heating coil 100 is raised together with the base 410 by the cylinder 420. As shown in FIG. 2, the rise of the high-frequency heating coil 100 is caused by the pair of linear heating conductors 110, 110 being connected to the axis WL of the shaft-shaped workpiece W.
Is performed until they face each other. Thus, the gap between the pair of linear heating conductor portions 110 and 110 and the peripheral surface of the shaft-shaped work W becomes the appropriate value G. In this case, the arc-shaped heating 120 and the 1/4 arc-shaped heating conductors 140, 140
Is more than the appropriate value G. The portions heated by the curved portions 141, 141 are subjected to induction hardening by spraying a cooling liquid from a cooling jacket 200. The high-frequency heating coil 100 includes a moving mechanism 30
While moving along the axis WL of the shaft-shaped work W by 0, the peripheral surface of the shaft-shaped work W is heated by an induced current caused by a high-frequency current flowing through the pair of linear heating conductors 110, 110. The heated portion is cooled by the cooling liquid from the cooling jacket 200 and subjected to induction hardening. When the arc-shaped heating conductor 120 of the high-frequency heating coil 100 reaches the position where the heating is completed, the movement of the high-frequency heating coil 100 by the moving mechanism 300 is stopped, and the high-frequency heating coil 100 is moved by the contact / separation moving mechanism 400.
Rises. That is, the gap between the arcuate heating conductor 120 and the position where the heating is completed is set to the appropriate value G. In this case, a pair of linear heating conductors 110, 11
The gap between 0 and the shaft-shaped workpiece W is equal to or more than the appropriate value G. Then, similarly to the case of the arc-shaped heating conductor 120, the portion where the heating is completed is heated by the induction current caused by the high-frequency current flowing through the curved portion 121 of the arc-shaped heating conductor 120. In this manner, the heating start position and the heating end position are different from each other by the 1/4 arc-shaped heating conductor portions 140, 1
The heating by the heating conductor 40 and the arc-shaped heating conductor 120 is performed at an appropriate value G of the gap.
Since the heating by 0 and 110 is performed at the appropriate value G of the gap, a hardened layer having an appropriate depth can be formed over the whole. Although the high-frequency heating coil 100 is moved by the moving mechanism 300 in the above-described embodiment, the high-frequency heating coil 100 is fixed, and the shaft-shaped work W is moved along the axis WL. May be moved. Further, the high-frequency heating coil 100 and the shaft-shaped work W may be moved simultaneously. In the above-described embodiment, the contact / separation moving mechanism 400 moves the high-frequency heating coil 100 toward and away from the shaft. The coil 100 may be moved toward and away from the coil 100. Alternatively, the high-frequency heating coil 100 and the shaft-shaped workpiece W may be moved at the same time by moving them simultaneously. Furthermore, the high-frequency heating coil 100 in the above-described embodiment uses a single heating conductor, but may use a so-called multi-turn heating coil having two or more heating conductors. The good thing is, of course. According to the present invention, a high-frequency hardening device for a shaft-shaped work according to the present invention includes a high-frequency heating coil for heating the shaft-shaped work, and a cooling jacket for injecting a coolant to a portion heated by the high-frequency heating coil. A moving mechanism for relatively moving the high-frequency heating coil and the shaft-shaped work along the axis of the shaft-shaped work; and a contact and separation movement for relatively moving the high-frequency heating coil and the shaft-shaped work toward and away from the shaft-shaped work. The high-frequency heating coil has a linear heating conductor portion along the axis of the shaft-shaped work, and an arc-shaped heating conductor portion straddling the peripheral surface of the shaft-shaped work. At the position where the heating of the workpiece is started and the position where it is finished, the gap between the arc-shaped heating conductor and the peripheral surface of the shaft-shaped workpiece is adjusted to an appropriate value by the contact / separation moving mechanism. In addition, the gap between the linear heating conductor portion and the peripheral surface of the shaft-shaped work is set to an appropriate value or more. Except for the start and end positions of heating, the linear heating conductor portion and the shaft-shaped work are separated by the moving mechanism. The gap between the peripheral surface of the arc-shaped heating conductor and the peripheral surface of the shaft-shaped work is set to be equal to or more than an appropriate value while the gap with the peripheral surface is set to an appropriate value. Therefore, the gap between the heating conductor of the high-frequency heating coil and the shaft-shaped work is reliably maintained at an appropriate value at the position where heating is started, the position where heating is ended, and other positions. Start heating like
The hardened layer formed at the end position does not become shallower than an appropriate value. [0036]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic configuration diagram illustrating a schematic configuration of an induction hardening device and an induction hardening method for a shaft-shaped work according to an embodiment of the present invention. FIG. 2 is a schematic configuration diagram illustrating a schematic configuration of an induction hardening device and an induction hardening method of a shaft-shaped work according to an embodiment of the present invention. FIG. 3 is a schematic configuration diagram illustrating a schematic configuration of an induction hardening apparatus and a method of induction hardening of a shaft-shaped workpiece according to an embodiment of the present invention. FIG. 4 is a schematic perspective view of a high-frequency heating coil used in the high-frequency hardening device for a shaft-shaped work according to the embodiment of the present invention. FIG. 5 is a schematic explanatory view showing a gap between a high-frequency heating coil and a shaft-shaped work of the high-frequency hardening device for a shaft-shaped work according to the embodiment of the present invention. [Description of Signs] 100 High-frequency heating coil 110 Linear heating conductor 120 Arc heating conductor 140 1/4 arc heating conductor 200 Cooling jacket 300 Moving mechanism 400 Contact / separation moving mechanism W Shaft-like work WL Shaft core

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Hideki Hashiguchi 4-16 Ohara, Yao-shi, Osaka Prefecture Inside Fuji Electronics Co., Ltd. (72) Inventor Yasufumi Nakai 4-16 Ohara, Yao-shi, Osaka Fuji Electronics Industry Co., Ltd. (72) Inventor Eiji Kojima 4-16 Ohara, Yao City, Osaka Prefecture Fuji Electronics Co., Ltd. (72) Yoshiyuki Uenishi 4-16 Ohara, Yao City, Osaka Prefecture Fuji Electronics Co., Ltd. (56 References JP-A-59-64716 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) C21D 9/00-9/44, 9/50 C21D 1/02-1/84

Claims (1)

(1) A high-frequency heating coil for heating a shaft-shaped work, a cooling jacket for spraying a cooling liquid to a portion heated by the high-frequency heating coil, the high-frequency heating coil and a shaft. A moving mechanism for relatively moving the workpiece along the axis of the shaft-shaped work, and a contact-separation moving mechanism for relatively moving the high-frequency heating coil and the shaft-shaped workpiece relative to each other, The high-frequency heating coil has a linear heating conductor along the axis of the shaft-shaped work, and an arc-shaped heating conductor extending across the peripheral surface of the shaft-shaped work, and starts heating the shaft-shaped work. At the position and the end position, the gap between the arc-shaped heating conductor portion and the peripheral surface of the shaft-shaped work is adjusted to an appropriate value by the contact / separation moving mechanism, and the linear heating conductor portion and the shaft are separated. The gap between the straight work conductor and the peripheral surface of the shaft-like work is adjusted to an appropriate value by the contact / separation moving mechanism except for the start and end positions of heating. An induction hardening device for a shaft-shaped work, wherein a gap between the arc-shaped heating conductor portion and a peripheral surface of the shaft-shaped work is set to an appropriate value or more.