JPH0354134Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial application field This invention relates to an induction hardened coil for recessed grooves.

2. Prior Art FIGS. 2a and 2b show conventional induction hardened coils for recessed grooves, and 70 shows the top 7.
1, a recessed groove in the workpiece having a bottom 72 and a side 73 between the top 71 and the bottom 72;

FIG. 2a shows an induction hardened coil 80 formed in a substantially S-shape. Connecting portions 85 and 8 are hollow conductors (not shown) that supply high-frequency current to the induction hardened coil 80 and supply or discharge cooling fluid.
6, the high frequency current flows through the connection 85, heats the sides 73 and bottom 72 of the recess groove 70 while flowing through each part of the induction hardening coil 80, and returns to the high frequency power source through the connection 86.

FIG. 2b shows an induction hardened coil 90 formed into a substantially rectangular shape. Hollow conductors (not shown) for supplying high-frequency current to the induction hardening coil 90 and for supplying or discharging coolant are connected to the connecting parts 95 and 96, and the high-frequency current flows from the connecting part 95 to the induction hardening coil 90. As it flows through each part, it heats the side part 73 and bottom part 72 of the recess groove 70, and returns to the high frequency power source through the connection part 96.

Problems to be solved by the invention By the induction hardening coil 80 shown in Fig. 2a,
When the recessed groove 70 is heated, the bottom 72 of the recessed groove 70 is heated only by the high frequency current flowing through the portions 81, 82 and 83 of the induction hardening coil 80 that are close to the bottom 72.
2 cannot be heated sufficiently, and even if the bottom part 72 is heated considerably, the heat loss from the bottom part 72 to the vicinity thereof is large, so the heating temperature of the bottom part 72 does not rise sufficiently, resulting in good quenching. The problem is that it cannot be done.

Also in FIG.
1 and 92, the heating of the bottom 72 has the same problems as above.

This idea was made in view of the above,
It is an object of the present invention to provide an induction hardening coil for a recessed groove that can sufficiently heat the bottom of the recessed groove and perform good hardening.

Means for Solving the Problems In order to solve the above problems, the present invention provides a high-frequency wave that moves in the longitudinal direction of the recess groove and connects the bottom and the side between the top and bottom of the recess groove. In the induction hardening coil for surface hardening of concave grooves, the coil includes a left coil connected in series,
The left coil is composed of a connecting coil and a right coil, and the left coil is located near the bottom of the recess groove and is parallel to the longitudinal direction of the recess groove, and the left coil has one end located at the left bottom coil. an upper left coil connected to the bottom left coil and protruding from the top of the recess groove in a direction perpendicular to the left bottom coil and corresponding to the shape of the side of the recess groove;
a left power supply coil having one end connected to the other end of the left upper coil and protruding in a direction perpendicular to the longitudinal direction of the recess groove; and one end connected to the other end of the left bottom coil to the left upper coil. a left lower coil formed to face each other, and a left side coil having one end connected to the other end of the left lower coil and protruding toward the left upper coil in the longitudinal direction of the recess groove. And the right coil is
a right bottom coil disposed close to and facing the left bottom coil; and a right top coil having one end connected to one end of the right bottom coil and facing the left top coil. a coil, a lower right coil having one end connected to the other end of the right bottom coil and facing the left lower coil; and a left side coil having one end connected to the other end of the right bottom coil. a right side coil formed to face each other, and a right power supply coil formed at the other end of the right side coil to protrude in a direction perpendicular to the longitudinal direction of the recessed groove, and the other end of the left side coil. The gist of the configuration is that the other end of the upper right coil is connected by the connecting coil.

Function The coolant supplied to the connections provided for the left and right power supply coils passes through the left and right coils, cools these coils, and reaches the connection coil. It is discharged from the provided connection.

Further, the high frequency current supplied to the connection portion provided on the left power feeding section coil flows through the left coil, the connection coil, and the right coil, thereby heating the bottom and side portions of the recessed groove. The high frequency current returns to the high frequency power source via a connection provided in the right feed section coil.

Example FIG. 1 shows a perspective view of an embodiment of the present invention.

The workpiece 50 has a concave groove 5 to be induction hardened.
5 is formed, 51, 52 and 53 are
These are the top, bottom and sides of the recessed groove 55, respectively.

The induction hardened coil 100 for recessed grooves shown in this embodiment is made of a hollow, highly conductive metal, and is composed of a left coil 10, a connecting coil 30, and a right coil 20 connected in series.

The left coil 10 has a left bottom coil 11 located near the bottom 52 of the recess groove 55 and parallel to the longitudinal direction of the recess groove 55, and one end of which is connected to one end of the left bottom coil 11 so that the left coil 10 is arranged in a direction perpendicular to the left bottom coil 11. In addition, an upper left coil 12 is formed to protrude toward the top 51 of the recess groove 55 in accordance with the shape of the side portion 53 of the recess groove 55, and one end is connected to the other end of the upper left coil 12 and the coil 12 is connected to the other end of the upper left coil 12. a left power supply coil 15 formed to protrude in a direction perpendicular to the longitudinal direction; a lower left coil 13 having one end connected to the other end of the left bottom coil 11 and facing the upper left coil 12; One end is connected to the other end of the lower left coil 13, and the upper left coil 1 extends in the longitudinal direction of the recessed groove 55.
The left side coil is formed to protrude toward the left side.

At the tip of the left power supply section coil 15, there is a connection section for connecting a hollow power supply conductor (not shown) for supplying high frequency current from a cooling liquid and a high frequency power source (not shown) to the induction hardening coil 100 for recessed grooves. 16 are provided.

The right coil 20 includes a right bottom coil 21 disposed close to and facing the left bottom coil 11 , and a right bottom coil 21 having one end connected to one end of the right bottom coil 21 and facing the left top coil 12 . The upper right coil 22 and the lower right coil 2 formed in
a lower right coil 23 having one end connected to the other end of the lower right coil 23 and facing the lower left coil 13;
A right side coil 24 is formed such that one end thereof is connected to the other end of the right lower coil 23 and faces the left side coil 14, and a concave groove 55 is formed at the other end of the right side coil 24 to protrude in a direction perpendicular to the longitudinal direction. The right power feeding unit coil 25 is provided with a right feeding unit coil 25.

At the tip of the right power supply section coil 25, there is a connection part for connecting a hollow power supply conductor (not shown) for supplying high frequency current from a cooling liquid and a high frequency power source (not shown) to the induction hardening coil 100 for recessed grooves. 26 are provided.

The other end of the left side coil 14 and the other end of the upper right coil 22 are connected by a stepped connecting coil 30. Further, a connecting portion 36 is provided approximately at the center of the connecting coil 30 to connect a coolant discharge pipe (not shown) for discharging the coolant of the induction hardened coil 100 for recessed grooves.

An insulator 40 is installed between the left bottom coil 11 and the right bottom coil 21.

Next, the operation of this embodiment will be explained.

The cooling liquid supplied to the connection part 16 and the connection part 26 by the power supply conductor passes through the left coil 10 and the right coil 20, respectively, and reaches the connection coil 30 while cooling these coils.
The coolant is discharged to the coolant discharge pipe connected to the coolant discharge pipe.

Furthermore, the high frequency current supplied to the connection portion 16 by the power supply conductor flows through the left coil 10, the connection coil 30, and the right coil 20 as indicated by the arrows in FIG. The bottom 52 and sides 53 of 55 are heated. The high frequency current returns to the high frequency power source via the power supply conductor connected to the connection portion 26.

A cooling liquid jacket (not shown) for quenching cooling liquid is provided, and the bottom part 52 and side part 53 of the recess groove 55 are heated by the induction hardening coil 10 for the recess groove, and then cooled by the cooling liquid. The quenching process is completed by being cooled by the cooling liquid ejected from the liquid jacket.

In this embodiment, since the currents flowing in the left bottom coil 11 and the right bottom coil 21 both flow in the same direction, the bottom portion 52 of the recessed groove 55 is sufficiently heated and good hardening is performed.

Effects of the invention As explained above, according to the invention, the high-frequency currents flowing through the left bottom coil and the right bottom coil, which constitute a part of the induction hardening coil for the recess groove, flow in the same direction. As a result of sufficient heating, the heating temperature at the bottom of the recessed groove can be sufficiently increased without being affected by heat loss transmitted from the bottom to the vicinity thereof, and there is an advantage that good hardening can be performed.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of an embodiment of the present invention, and FIGS. 2A and 2B are perspective views of a conventional induction hardening coil for recessed grooves. 10...Left coil, 11...Left bottom coil, 1
2... Upper left coil, 13... Lower left coil, 1
4... Left side coil, 15... Left power feeding section coil,
16...Connection part, 20...Right coil, 21...Right bottom coil, 22...Right upper coil, 23...Right lower coil, 24...Right side coil, 25...Right power supply section coil, 26... ... Connection part, 30 ... Connection part, 36 ... Connection part, 40 ... Insulator, 50 ...
Workpiece, 51...Top, 52...Bottom, 53...
Side part, 55...Recess groove, 100...Induction hardening coil for recess groove.

Claims (1)

[Scope of utility model registration request] An induction hardening coil for a recess groove that moves in the longitudinal direction of the recess groove to induction surface harden the side portion between the top and bottom of the recess groove and the bottom, the coil being a left coil connected in series. , a connecting coil, and a right coil, and the left coil includes a left bottom coil located near the bottom of the recess groove and parallel to the longitudinal direction of the recess groove, and one end of which is connected to one end of the left bottom coil. an upper left coil connected to the bottom left coil and protruding from the top of the recess groove in a direction perpendicular to the left bottom coil and corresponding to the shape of the side of the recess groove;
a left power feeding portion coil having one end connected to the other end of the left upper coil and protruding in a direction perpendicular to the longitudinal direction of the recess groove; and one end connected to the other end of the left bottom coil and being connected to the left upper coil. The left side coil includes a left lower coil formed to face each other, and a left side coil having one end connected to the other end of the left lower coil and protruding toward the left upper coil in the longitudinal direction of the recess groove. Also, the right coil is
a right bottom coil disposed close to and facing the left bottom coil; and a right top coil having one end connected to one end of the right bottom coil and facing the left top coil. a lower right coil having one end connected to the other end of the right bottom coil and facing the left lower coil; and a left side coil having one end connected to the other end of the right bottom coil. a right side coil formed to face each other, and a right power supply coil formed at the other end of the right side coil to protrude in a direction perpendicular to the longitudinal direction of the recessed groove, and the other end of the left side coil. and the other end of the upper right coil are connected by the connection coil, an induction hardening coil for a recessed groove.