JPH0238909Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field This invention relates to a cooling jacket for high frequency heating (hereinafter referred to as a jacket).

BACKGROUND ART For example, parts of various shapes such as car bearings are hardened by high frequency heating.

By the way, when attempting to harden the inner surface of a cylindrical workpiece, it is generally necessary to cool the workpiece from the outer peripheral surface during heating in order to obtain a shallow and uniform hardening depth. For this cooling, cooling water is sprayed onto the outer surface of the workpiece by selecting and using a jacket that corresponds to the size, shape, wall thickness, etc. of the workpiece.

To explain in more detail, when attempting to induction harden a workpiece that has partially different wall thicknesses, such as the above-mentioned car bearing, the inner thickness is It is necessary to inject more cooling water towards the workpiece compared to the thicker part of the workpiece.

The reason for this is that if you ignore the difference in wall thickness and try to induction harden both the thicker and thinner parts at the same time, if the wall thickness is relatively thin compared to the desired surface hardening layer, the thinner parts will In this case, the depth of the hardened layer (deformation depth) produced by hardening is deep, sometimes resulting in deep hardening, and the hardening depth tends to be shallow in thick parts. This is because such non-uniform hardening depth may lead to a reduction in the service life of the workpiece or defects such as partial cracks.

FIG. 4 shows an example of high frequency heating using a conventional jacket.

A workpiece 5 is installed inside the jacket 31, which has a hollow cylindrical shape and has a small-diameter water injection hole 32A and a large-diameter water injection hole 32B formed on the inner side surface, and a current transformer is installed inside the workpiece 5. 6
High frequency coils 11 and 2 connected to the secondary side of
1 is inserted.

The high-frequency heating of the workpiece 5 is performed while passing a high-frequency current through the high-frequency coils 11 and 21 and at the same time injecting cooling water from each of the water injection holes.

Problems to be Solved by the Invention However, the shapes and dimensions of the above-mentioned workpieces vary widely, and in order to harden such workpieces by high-frequency heating, it is necessary to replace the jacket with the most suitable jacket for the workpiece each time for the reasons mentioned above. There is a need. There is a problem in that this replacement is time-consuming and reduces the productivity of induction hardening work. Furthermore, it is very complicated because it is necessary to prepare various jackets in advance.

This invention was devised in view of the above circumstances.
It is an object of the present invention to provide a jacket that can reduce the frequency of jacket replacement as much as possible even when workpieces have different dimensions, shapes, wall thicknesses, etc.

Means for Solving the Problem The jacket of the present invention includes a fixed jacket having a fixed jacket water injection hole and a movable jacket having a movable jacket water injection hole, and the movable jacket is arranged inside the fixed jacket. The movable jacket is installed in a watertight and rotatable manner, and after the movable jacket is fixed to the fixed jacket with the movable jacket water injection hole superimposed on the fixed jacket water injection hole, the movable jacket is fixed to the fixed jacket.
Cooling water is injected from the movable jacket water injection hole.

Function: By rotating the movable jacket relative to the fixed jacket in consideration of the shape of the workpiece to be induction hardened, a jetting pattern optimal for the workpiece is set and cooling water is jetted.

Example An embodiment of the present invention will be described below.

FIG. 1a is a perspective view of a jacket according to the present invention;
Fig. 1b is a sectional view taken along line A-A in Fig. 1, Fig. 2a is a layout diagram of the fixed jacket water injection holes provided in the inner peripheral part of the fixed jacket, and Fig. 2b is a diagram showing the arrangement of the fixed jacket water injection holes provided in the cylindrical part of the movable jacket. A layout diagram of the movable jacket water injection hole,
Figures 3a to 3c show the relationship between the fixed jacket water injection hole and the movable jacket water injection hole when the reference point of the movable jacket and the reference point of the fixed jacket are aligned, 15 degrees apart, and 30 degrees apart. The positions are shown for each case.

The fixed jacket 100 has a hollow cylindrical structure, and includes an inner peripheral part 103, an outer peripheral part 104, and an upper end part 10.
5. It has a jacket chamber 102 which is a space closed by a lower end portion 106.

Hose connection fitting 10 formed on the outer peripheral part 104
A hose 108 is connected to 7, and cooling water is sent to the jacket chamber 102 by this hose 108. A plurality of substantially oval fixed jacket water injection holes 109 are opened in the axial direction in the inner peripheral portion 103 .

Cylindrical portion 201 of cylindrical movable jacket 200
is rotatably and watertightly inserted and fitted into the inner surface of the inner circumference 103 of the fixed jacket 100, and the lower surface of the flange 205 formed at the upper end of the movable jacket 200 is connected to the upper end 105 of the fixed jacket 100. It is in slidable contact with the upper surface of.

The cylindrical portion 201 is provided with a plurality of substantially circular movable jacket water injection holes 209 . The flange portion 205 of the movable jacket 200 has three grooves 202 along the outer peripheral edge of the flange portion 205.
is formed.

The circumferential angle of each groove 202 is approximately 45 degrees. Each groove 20
An arc-shaped elongated hole 203 is formed at the bottom of 2. One screw hole 106 is formed on the upper surface of the upper end portion 105 at a position corresponding to each of the elongated holes 203 . The movable jacket 200 is fixed by the screw 204 inserted into the elongated hole 203 and the screw hole 106.
is fixed to the fixed jacket 100, and the screw 204
By slightly loosening the fixed jacket 100
The movable jacket 200 and the movable jacket 200 can be rotated relative to each other, and by tightening the screw 204, the movable jacket 200 can be fixed to the fixed jacket 100 again.

As shown in FIG. 2a, the fixed jacket water injection holes 109 are provided at a pitch of 45 degrees in the circumferential angle at the upper, middle, and lower portions of the inner circumferential portion 103, respectively. upper and middle parts,
The lower and upper fixed jacket water injection holes 109 in the center and lower portions are provided at intervals of 15 degrees in circumferential angle. The triangular mark 110 is a reference point for the assumed circumferential angle on the inner circumferential portion 103, and
The center point of a certain fixed jacket water injection hole 109 at the upper part of the figure is defined as the 0 degree point, and this 0 degree point is shown.

As shown in FIG. 2b, the movable jacket water injection holes 209 correspond to the fixed jacket water injection holes 109 in the upper, middle, and lower portions, respectively.
The movable jacket water injection holes 20 are provided at the upper, middle, and lower parts of the cylindrical part 201, and are adjacent to each other.
9 are provided at intervals of 15 degrees on the circumference.

The triangular mark 210 is a reference point of the assumed circumferential angle on the cylindrical part 201, and the center point of a certain movable jacket water injection hole 209 in the upper part of the cylindrical part 201 is the 0 degree point. It shows.

The upper movable jacket water injection hole 209 is provided at a pitch of 45 degrees from the triangular mark 210.
The movable jacket water injection hole 209 in the center is located at a point 15 degrees from each of the triangular marks 210, 90 degrees, 180 degrees, and -135 degrees, and 45 degrees sequentially from this 15 degree point.
The movable jacket water injection hole 209 at the bottom is located at the triangular mark 210, 90.
They are provided at points 30 degrees from each point of 180 degrees, 180 degrees, and -135 degrees, and at points 15 degrees, 15 degrees, and 15 degrees sequentially from these 30 degrees.

If cooling water is now sent from the hose 108, if the movable jacket water injection hole 209 overlaps the fixed jacket water injection hole 109 and is in a co-hole state, the cooling water will be sent from the movable jacket water injection hole 209. is injected.

Figure 3a shows the triangular mark 110 and the triangular mark 21.
0, cooling water is injected only from the movable jacket water injection hole 209A that overlaps the fixed jacket water injection hole 109.

That is, in the case shown in the figure, the same effect is achieved as when a dedicated jacket is used for a workpiece whose upper part is thinner and whose center and lower parts are thick.

Fig. 3b shows the case where the screw 204 is loosened and the movable jacket 200 is rotated 15 degrees in the direction of arrow B, and Fig. 3c shows the case when it is also rotated 30 degrees, and as in Fig. 3a, In either case, cooling water is injected only from the movable jacket water injection hole 209A.

That is, the case shown in FIG. 3b is applied to a short workpiece whose center portion is thinner than its lower portion. FIG. 3c is applied to a thin ring-shaped workpiece.

Note that when the movable jacket 200 is rotated 15 degrees and 30 degrees in the direction opposite to arrow B, the spray patterns are similar to those shown in FIGS. 3c and 3b, respectively.

Therefore, since the jacket of the present invention can provide three types of spray patterns, the same effect as using three different jackets can be obtained with one jacket.

The arrangement of the fixed jacket water injection holes 109 and the movable jacket water injection holes 209 described above is an example, and various other arrangements are possible. In other words, the water to be injected may be in any number of stages without being restricted to the three stages of the upper, middle, and lower parts, and the pitch of the circumferential angle is not limited to 15 degrees.
Many spray patterns can be obtained.

Effects of the Invention As described above, according to the present invention, the movable jacket is made rotatable, and the movable jacket is fixed to the fixed jacket with the movable jacket water injection holes superimposed on the fixed jacket water injection holes in a co-hole state. As a result, various patterns of water jet can be obtained from the movable jacket water jet depending on the arrangement of the fixed jacket water jet hole and the movable jacket water jet hole. There is no need to replace it, and therefore the efficiency of cooling work can be improved. Furthermore, since the number of jackets is reduced, it is possible to reduce the overall cost.

[Brief explanation of the drawing]

FIG. 1a is a perspective view of a jacket according to the present invention;
Fig. 1b is a sectional view taken along line A-A in Fig. 1, Fig. 2a is a layout diagram of the fixed jacket water injection holes provided in the inner peripheral part of the fixed jacket, and Fig. 2b is a diagram showing the arrangement of the fixed jacket water injection holes provided in the cylindrical part of the movable jacket. A layout diagram of the movable jacket water injection hole,
Figures 3a to 3c show the relationship between the fixed jacket water injection hole and the movable jacket water injection hole when the reference point of the movable jacket and the reference point of the fixed jacket are aligned, 15 degrees apart, and 30 degrees apart. position, 4th
The figures each show an example of high frequency heating using a conventional jacket. 100... fixed jacket, 102... jacket chamber, 103... inner peripheral part, 104... outer peripheral part,
105...Top end, 106...Screw hole, 109...
...Fixed jacket water injection hole, 110, 210...
Triangular mark, 200...Movable jacket, 201
... Cylindrical part, 202 ... Groove, 203 ... Long hole, 2
04...Screw, 205...Flange part, 209...
...Movable jacket water injection hole, 209A...Movable jacket water injection hole.

Claims (1)

[Scope of utility model registration request] The movable jacket is equipped with a fixed jacket having a fixed jacket water injection hole and a movable jacket having a movable jacket water injection hole, and the movable jacket is installed watertightly and rotatably inside the fixed jacket, and the movable jacket has a water injection hole. By fixing the movable jacket to the fixed jacket with the injection holes superimposed on the fixed jacket water injection holes, the injection pattern of the cooling water injected from the movable jacket water injection holes is made variable. Cooling jacket for high frequency heating.