JPH0714354Y2 - High frequency heating coil - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a saddle-shaped semi-open type high frequency heating coil used for surface quenching a cylindrical or cylindrical work.

<Prior art> Conventionally, a high frequency heating coil is often used as a surface heating device for the surface hardening of a cylindrical work such as a ball screw and the surface of a cylindrical work. There is a type high frequency heating coil. FIG. 5 shows a conventional saddle type half open type high frequency heating coil.

A conventional saddle-shaped semi-open type high-frequency heating coil includes a pair of semi-annular portions 92 and 93 that surrounds both ends of a work 91 to be subjected to high-frequency heating over a substantially half circumference, and corresponding ends of the pair of semi-annular portions. And a pair of linear portions 94 and 95 connecting the portions to each other. Each part is integrally configured by a rectangular tube-shaped conductor having a cooling water channel inside. In order to pass a high frequency current through the coil, for example, one semi-annular portion 92 is divided into two and connected to a high frequency power source. When processing the work 91, a high-frequency current is passed through the coil while rotating the work 91 about its axis.

<Problems to be solved by the invention> A work 91 to be surface-heated by such a high-frequency heating coil.
Usually range from many varieties. However, in the conventional high-frequency heating coil, since the semi-annular portions 92 and 93 and the straight portions 94 and 95 are integrally configured, there is a restriction that only the work 91 having the same outer diameter and the same length can be processed. . Therefore, when trying to process a work piece 91 having different dimensions, it is necessary to prepare a number of coils corresponding to the dimensions, resulting in an increase in the cost of the coil and a decrease in productivity due to the coil replacement. Therefore, the processing cost such as quenching was affected not a little.

Even if the length of the work is changed, the same high-frequency heating coil can be used by dividing the straight part at the middle part in the longitudinal direction and adjusting the length of the straight part according to the length of the work. However, such a solution has a problem that the linear portion cannot be fixed to the support such as the case because the linear portion is expanded and contracted, and it is difficult to change the dimensions.

The present invention was created in view of such circumstances, and an object thereof is to provide a high-frequency heating coil capable of processing workpieces having different lengths without changing the length of the straight portion.

<Means for Solving the Problems> The high frequency heating coil according to the present invention is a cylindrical work or a cylindrical work to be subjected to high frequency heating, and the axial direction 2 thereof.
In a saddle-shaped semi-open type high frequency heating coil having a pair of semi-circular portions surrounding substantially half circumference at a position, and a pair of linear portions interconnecting corresponding end portions of the pair of semi-circular portions. , One of the pair of semi-annular portions is integrally connected to one end of the pair of linear portions, the other end of the pair of linear portions is a linear open end, and the other semi-annular portion Is separated from the pair of linear portions and is connected to an arbitrary position in the longitudinal direction of the linear portions.

The semi-annular portion separated from the linear portion is, for example, a pair of extended portions extending along the linear portion from both ends thereof and a pair of linear portions, respectively. Connected.

<Operation> By changing the connecting position of the semi-annular portion separated from the pair of linear portions to the linear portion, according to the length of the work,
Workpieces with different lengths are processed with the straight part fixed.

<Embodiment> An embodiment of the present invention will be described below with reference to the drawings. First
FIG. 1 is a perspective view showing an example of a high-frequency heating coil according to the present invention, FIG. 2 is a semi-annular portion on the side opposite to a high-frequency power source, and FIGS. 2 (a), (b) and (c) are respectively Perspective view,
Fig. 2 (a) is a sectional view taken along the line AA, and Fig. 2 (b) is B.
FIG. 3 is a perspective view of a clamp used for joining the semi-annular portions, and FIG. 4 is a vertical sectional front view showing the joined state.

The high-frequency heating coil shown here includes a pair of linear portions 10 and 20 supported in parallel in a horizontal state, and a pair of semi-annular portions 30 and 40 arranged at intervals in the longitudinal direction. It has. Each of the parts is made of a rectangular tube-shaped copper tube or the like having a cooling water channel inside.

The pair of linear portions 10 and 20 are fixed to a support such as a case (not shown) by a plurality of bolts 11 and 21 protruding from the side surfaces thereof. The lengths of the straight portions 10 and 20 are the semi-annular portions 30 and 40.
It has been determined that the longest workpiece with an outer diameter corresponding to can be processed.

One end of the semi-annular portion 30 is joined to the upper surfaces of the end portions of the linear portions 10 and 20 so as to communicate with each other, and is integrated with the linear portions 10 and 20. The semi-annular part 30 is divided into two parts at the central part, and lead parts 50 and 60 used for connection with a high frequency power source are respectively extended from the respective upper surfaces of opposite ends thereof.

The lead parts 50 and 60 are also made of a rectangular tube-shaped copper tube or the like having a cooling water channel inside, and a lead plate made of Teflon or the like.
Insulated by 51 and 61. Water supply pipes 52 and 62 for introducing cooling water are connected to the respective tip portions of the lead portions 50 and 60, respectively. Drain pipes 12, 22 corresponding to water supply pipes 52, 62
Are connected to the upper surfaces of the other ends of the linear portions 10 and 20, respectively.

As shown in FIG. 2, the other semi-annular portion 40 has a linear portion 10,
It is separate from 20. The semi-annular portion 40 has a horseshoe shape having the same arc as the one semi-annular portion 30, and has a main body 41 and a main body 41.
It has extension portions 42 and 43 extending from both end portions of 41 toward the other end sides of the linear portions 10 and 20.

The main body 41 is a member 41 having a horseshoe shape and a U-shaped cross section.
In b, a horseshoe-shaped plate material 41a is also brazed, and a cooling water channel 41c is formed inside.
In order to circulate the cooling water in the semi-annular portion 40, a water supply pipe 44,
Drain pipes 45 are connected to each. 41d are these water supply pipes 44
It is an opening to which the drain pipe 45 is connected.

The extending portions 42 and 43 are block-shaped with no hollow portion inside, and are fixed to the lower ends of the semi-annular portion 40 by brazing. Then, the extending portions 42 and 43 are adapted to overlap the linear portions 10 and 20, and the extending portions 42 and 43 to the linear portions 10 and 20,
By sandwiching both by clamps 70 and 80 in a state where 43 is overlapped, the semi-annular portion 40 is connected to the linear portions 10 and 20 at arbitrary positions in the longitudinal direction.

The clamps 70 and 80 used for connecting the semi-annular portion 40 have the same structure. Explaining the clamp 70, a screw hole 72 is formed in the upper side of the main body 71 formed of a hard insulating material such as laminate in a U shape, and by screwing a bolt 73 into the screw hole 72, the upper side and the lower side The straight portion 10 and the extending portion 42 are sandwiched and fixed between and.

According to the high-frequency heating coil having such a configuration, the semi-annular portion
If the workpiece has an outer diameter corresponding to 30, 40, it can be subjected to high frequency heating regardless of its length. The heating procedure will be described below.

Loosen the clamps 70, 80 so that the distance between the semi-annular parts 30, 40 is the length corresponding to the length of the hardened part of the workpiece.
The semi-annular portion 40 is moved along the linear portions 10 and 20. When the semi-annular portion 40 is moved, the clamps 70, 80 are tightened so as to fix the semi-annular portion 40 to the linear portions 10, 20. By tightening the clamps 70, 80, the extension parts 42, 43 of the semi-annular part 40 are straight parts.
It is crimped to 10 and 20 to secure sufficient contact area and contact pressure.

When the distance between the semi-annular parts 30 and 40 is adjusted according to the length of the work, straight lines are placed so that both ends of the hardened part of the work are located below each of the semi-annular parts 30 and 40. The work is supported between the parts 10 and 20. Then, with the cooling water being supplied to the water supply pipes 44, 56, 62, a high frequency voltage is applied between the lead parts 50, 60 while rotating the workpiece about the axis. As a result, the part sandwiched between the semi-annular parts 30, 40 of the work surface layer part is subjected to high frequency heating over the entire surface.

At this time, the cooling water supplied to the water supply pipe 52 is
After passing through each of the insides of the straight portion 10 and one of the semicircular portions 30 that are divided into two parts, they are cooled and discharged from the drain pipe 12. The cooling water supplied to the water supply pipe 62 passes through the inside of the straight portion 20 on the other side of the lead portion 60 and the divided semicircular portion 30 and is discharged from the drain pipe 22. The cooling water supplied to the water supply pipe 44 cools the semi-annular portion 40 from the inside and is discharged from the drain pipe 45.

When heating works of different lengths with high frequency, ensure that a distance according to the length is secured between the semi-annular parts 30, 40.
Change the fixed position of the semi-annular portion 40. At this time, the straight part 10,
Since the length of 20 is not changed, the distance between the semi-annular portions 30, 40 is adjusted with the straight portions 10, 20 fixed to a support such as a case. As a result, the work is extremely simple, together with the use of the clamps 70 and 80.

It goes without saying that the semi-annular portion 40 can be connected to the linear portions 10 and 20 by means other than the clamps 70 and 80.

<Effects of the Invention> As described above, in the case of the high-frequency heating coil according to the present invention, one of the semi-annular portions is connected to an arbitrary position in the longitudinal direction of the straight portion, so that workpieces having different lengths are subjected to high-frequency heating with the same coil. To be done. Therefore, a large number of types of high frequency heating can be performed with a small number of coils, and the cost required for the coils can be significantly reduced. Further, since the dimension change of the work can be dealt with without changing the length of the linear portion and the straight portion is fixed, the work at the time of dimension change becomes easy.

In the semi-annular portion separated from the linear portion, a pair of extending portions extending from both ends thereof along the linear portion is provided, and when sandwiching each extending portion and the pair of linear portions, respectively, The semi-annular portion can be easily connected to the straight portion, and a sufficient contact area and contact pressure can be secured between them.

[Brief description of drawings]

FIG. 1 is a perspective view showing an example of a high-frequency heating coil according to the present invention, FIG. 2 is a semi-annular portion on the side opposite to a high-frequency power source, and FIGS. 2 (a), (b) and (c) are ,Each,
A perspective view, a sectional view taken along the line AA of FIG. 2 (a), a sectional view taken along the line BB of FIG. 2 (a), and FIG. 3 are used for joining the semi-annular portions. FIG. 4 is a perspective view of the clamp, FIG. 4 is a vertical sectional front view showing the joined state, and FIG. 5 is a perspective view schematically showing a conventional high-frequency heating coil. 10, 20 …… Straight section 30, 40 …… Semi-annular section 42,43 …… Extended section 50,60 …… Lead section 70,80 …… Clamp

Claims (2)

[Scope of utility model registration request] 1. A pair of semi-circular portions surrounding a substantially cylindrical or cylindrical work to be subjected to high-frequency heating at two positions in the axial direction over substantially semi-circle, and the pair of semi-circular portions correspond to each other. In a saddle-shaped semi-open type high-frequency heating coil having a pair of straight parts connecting the ends to each other, one of the pair of semi-annular parts is integrally connected to one end of the pair of straight parts,
The other end of the pair of straight portions is formed into a linear open end, and the other semi-annular portion is separated from the pair of straight portions and is connected to an arbitrary position in the longitudinal direction of the straight portions. A high-frequency heating coil characterized in that 2. A semi-annular portion separated from the pair of straight portions has a pair of extending portions extending from both ends thereof along the straight portions, and the pair of extending portions and the pair of extending portions. The high frequency heating coil according to claim 1, wherein the linear portion and the linear portion are held by each other.