JPH0581263U - Inner quenching device for cylindrical work with bottom - Google Patents

Abstract

(57) [Summary] [Purpose] The entire inner surface of the bottomed cylindrical work is uniformly and completely quenched. [Structure] A central axis of a high frequency induction heating coil 10 is made vertical, and a cooling jacket 20 which also serves as a high frequency induction heating coil is connected and held below the central axis. The high frequency induction heating coil 10 and the cooling jacket 20 are inserted from above into a bottomed cylindrical work set with the bottom facing down. While supplying a high-frequency current to the high-frequency induction heating coil 10 and supplying the quenching liquid into the cooling jacket 20, these are gradually moved upward. The inner surface of the bottomed cylindrical work is moved from bottom to top and heated, and the heating part thereof is quenched and quenched by the quenching liquid ejected from the cooling jacket 20. The quenching liquid accumulated in the bottomed cylindrical work is sequentially discharged through the quenching liquid discharge pipe 40 so that the quenching liquid does not come into contact with the heating part before the rapid cooling.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an inner surface quenching device for a cylindrical work piece with a bottom, which induction hardens the inner surface of a cylinder with a bottom.

[0002]

[Prior Art]

 The inner surface of a cylindrical work with a bottom such as a cylinder with a bottom is quenched by a quenching device in which, for example, a high-frequency induction heating coil is combined with a cooling jacket. FIG. 5 shows a conventional bottomed cylindrical workpiece inner surface quenching device in which a high frequency induction heating coil is combined with a cooling jacket.

The high-frequency induction heating coil 60 has its central axis 60a oriented in the vertical direction, and an annular cooling jacket 61 is concentrically connected and held on the lower surface side of the high-frequency induction heating coil 60. When quenching the inner surface 71 of the bottomed cylindrical work W, the bottomed cylindrical work W has its opening 72 downward, and the high-frequency induction heating coil 60 and the cooling jacket 61 are placed inside the bottomed cylindrical work W. To the opening 72. Then, while supplying a high-frequency current to the high-frequency induction heating coil 60, supplying a quenching liquid into the cooling jacket 61, and further rotating the bottomed cylindrical work W in the circumferential direction, the high-frequency induction heating coil 60 and cooling are performed. The jacket 61 is gradually inserted upward from the opening 72 of the bottomed cylindrical work W.

As a result, the inner surface 71 of the bottomed cylindrical work W is moved and heated in the axial direction, the quenching liquid is sprayed from the cooling jacket 61 to the inner surface 71, and the inner surface 71 is moved and quenched in the axial direction. .. The quenching liquid sprayed on the inner surface 71 of the bottomed cylindrical work W is discharged from the opening 72 of the bottomed cylindrical work W. Quenching is performed with the opening 72 of the bottomed cylindrical work W facing downward so that the quenching liquid in the bottomed cylindrical work W is smoothly discharged to the outside.

[0005]

[Problems to be solved by the device]

 In such a conventional inner surface quenching apparatus for a bottomed cylindrical work W, quenching is performed with the opening of the bottomed cylindrical work W facing downward. It doesn't collect. However, since the high frequency induction heating coil 60 and the cooling liquid jacket 61 are thick, it is impossible to quench the inner surface 71 of the bottomed cylindrical work W to the bottom portion 73. Further, it is not good in terms of workability to dispose the high frequency induction heating coil 60 from below and to perform quenching with the opening 72 of the bottomed cylindrical work W facing down.

The present invention was devised in view of such circumstances, and provides an inner surface quenching apparatus for a cylindrical work with a bottom capable of uniformly quenching the entire inner surface of the cylindrical work with a bottom with good workability. The purpose is to do.

[0007]

[Means for Solving the Problems]

 An inner surface quenching device for a cylindrical work with a bottom according to the present invention is an annular high frequency induction heating coil which is inserted from above into a cylindrical work with a bottom supported downward to heat the inner surface of the work by high frequency induction. And is held below the high-frequency induction heating coil and inserted into the bottomed cylindrical work together with the high-frequency induction heating coil to induction-heat the inner surface of the work while ejecting the quenching liquid introduced inside. The annular cooling jacket that also serves as a high-frequency induction heating coil and has the ejection holes formed on the outer surface, and the high-frequency induction heating coil and the cooling jacket are inserted into the bottomed cylindrical work from above and the bottomed cylindrical work is inserted. Drive mechanism for moving the high-frequency induction heating coil and the cooling jacket in the axial direction relative to the bottomed cylindrical work in order to extract the high-frequency induction heating coil and the high-frequency induction heating coil and A quenching liquid discharge pipe that is inserted into the bottomed cylindrical work through each inside of the cooling jacket and sucks and discharges the quenching liquid accumulated below the cooling jacket in the bottomed cylindrical work. It has a feature.

[0008]

【Example】

 Embodiments of the present invention will be described below with reference to the drawings. 1 is a perspective view showing an example of an inner surface quenching apparatus for a cylindrical work with a bottom according to the present invention, FIG. 2 is a sectional view taken along the line AA of FIG. 1, and FIG. 3 is a sectional view taken along the line BB of FIG. FIG. 4 is a schematic view for explaining the quenching operation, as viewed from the arrow.

The inner surface quenching apparatus shown here has an annular high-frequency induction heating coil 10 with its central axis oriented in the vertical direction, and an annular cooling device concentrically held below the annular high-frequency induction heating coil 10. The jacket 20 is provided with a power supply body 30 for supplying power to the jacket 20 and a quenching solution discharge pipe 40 for discharging the quenching solution from the bottomed tubular work W. The power supply body 30 also serves as a holder for the high frequency induction heating coil 10 and the cooling jacket 20.

The high frequency induction heating coil 10 is configured by bending a copper rectangular tube whose both ends are closed into an annular shape, and its outer diameter is slightly smaller than the inner diameter of the bottomed cylindrical work W. On the upper surface of the high frequency induction heating coil 10, three guides 11 made of ceramic chips are attached at equal intervals in the circumferential direction. The three guides 11 contact the inner surface of the bottomed cylindrical work W to hold the high-frequency induction heating coil 10 in the bottomed cylindrical work W concentrically.

The cooling jacket 20 is formed of a copper rectangular tube similarly to the high frequency induction heating coil 10, and its outer diameter is the same as the outer diameter of the high frequency induction heating coil 10. As shown in FIG. 2, the outer surface of the lower end portion of the cooling jacket 20 is slightly inclined downward, and a large number of quenching liquid ejection holes 21 are formed on the entire circumference thereof.

The power supply body 30 has a copper water supply pipe 31 which also serves as a lead. As shown in FIG. 3, the water supply pipe 31 is inserted through a vertical water supply pipe 32. The water supply pipe 32 is also made of a copper pipe and doubles as a lead. A space between the water supply pipe 31 and the water supply pipe 32 is closed by a pair of upper and lower plugs 33, 33. Each plug 33 is made of an insulating material such as a laminated resin.

The upper end of the water supply pipe 31 is electrically connected to one of a pair of lead plates 34, 34 joined with an insulating plate sandwiched therebetween, and also connected to a water supply nozzle 35 attached to the lead plate 34. ing. The upper end of the water supply pipe 32 is electrically connected to the other lead plate 34 by a connection pipe 32a made of a copper pipe, and is also connected to a water supply nozzle 35 attached to the lead plate 34.

As shown in FIG. 2, the lower end of the water supply pipe 31 is connected to a water supply hole 12 formed on the inner surface of one end of the high frequency induction heating coil 10. The other end of the high frequency induction heating coil 10 and one end of the cooling jacket 20 are connected by a conductor 50. The electric conductor 50 has a water passage 51 inside, the upper end of which is formed in the drain hole 13 formed on the inner surface of the other end of the high-frequency induction heating coil 10, and the lower end of which is formed on the inner surface of one end of the cooling jacket 20. The water supply holes 22 are connected to each other. A water supply hole 23 is also formed on the inner surface of the other end of the cooling jacket 20, and the lower end of the water supply pipe 32 is connected to this through a connecting pipe 32b made of a copper pipe.

The lead plates 34, 34 are connected to a high frequency transformer (not shown), and reciprocate in the vertical direction by raising and lowering the high frequency transformer, thereby raising and lowering the high frequency induction heating coil 10 and the cooling jacket 20 in the axial direction.

The quenching liquid discharge pipe 40 is a hard pipe made of synthetic resin, and its lower portion is held vertically along the water supply pipe 32. The lower end portion of the quenching liquid discharge pipe 40 passes through the insides of the high-frequency induction heating coil 10 and the cooling jacket 20 and slightly projects below the cooling jacket 20. The upper end of the quenching liquid discharge pipe 40 is connected to a vacuum suction pump via a flexible pipe (not shown). The lower portion of the quenching liquid discharge pipe 40 is moved up and down in the axial direction, but the up and down movement is performed separately from the up and down movement of the high frequency induction heating coil 10 and the cooling jacket 20.

In order to quench the inner surface of the bottomed cylindrical work W, first, as shown in FIG. 4A, the high frequency induction heating coil 10, the cooling jacket 20 and the quenching liquid discharge pipe 40 are raised. Then, the cylindrical work W with a bottom is set under the cooling jacket 20 with the bottom thereof facing down. Next, as shown in FIG. 4B, the high frequency induction heating coil 10, the cooling jacket 20, and the quenching liquid discharge pipe 40 are lowered, and the lower surface of the cooling jacket 20 and the lower end of the quenching liquid discharge pipe 40 are bottomed. Stop these at a position that is almost in contact with the bottom of the cylindrical work W. Then, as shown in FIG. 4 (C), while operating the high frequency transformer and the vacuum suction pump, water is supplied to the water supply nozzles 35, 35, and further while the bottomed cylindrical work W is rotated in the circumferential direction, The high frequency induction heating coil 10 and the cooling jacket 20 are gradually raised.

By the operation of the high frequency transformer, a high frequency current flows through a system path including the lead plate 34, the water supply pipe 31, the high frequency induction heating coil 10, the conductor 50, the cooling jacket 20, the water supply pipe 32 and the lead plate 34. Due to the high-frequency current flowing through the high-frequency induction heating coil 10 and the cooling jacket 20, a part of the bottomed cylindrical work W in the axial direction is high-frequency heated over the entire circumference. Then, as the high-frequency induction heating coil 10 and the cooling jacket 20 rise, the inner surface of the bottomed cylindrical work W is sequentially moved and heated from bottom to top.

The water supplied from one of the water supply nozzles 35 into the water supply pipe 31 passes through the inside of the high frequency induction heating coil 10 to cool it, and then passes through the inside of the conductor 50 into the cooling jacket 20. It enters, is cooled, and is ejected from the quenching liquid ejection hole 21 to the outside of the cooling jacket 20. The water supplied from the other water supply nozzle 35 into the water supply pipe 32 directly enters the cooling jacket 20, cools it, and is ejected from the quenching liquid ejection hole 21 to the outside of the cooling jacket 20. As a result, the inner surface heating portion of the bottomed tubular work W is rapidly cooled to become a quenched structure.

At this time, the cooling jacket 20 also serves as a high-frequency induction heating coil and can be quenched to the bottom of the bottomed cylindrical work W. The water jetted into the bottomed cylindrical work W from the quenching liquid ejection hole 21 of the cooling jacket 20 rapidly cools the inner surface heating part of the bottomed cylindrical work W, and then the water inside the bottomed cylindrical work W is cooled. Accumulate in. However, the water in the bottomed cylindrical work W is sequentially discharged to the outside of the bottomed cylindrical work W by the quenching liquid discharge pipe 40. Therefore, the water surface in the bottomed cylindrical work W does not rise. Therefore, the situation in which the heating portion of the bottomed cylindrical work W before quenching is obstructed is avoided, and the inner surface of the bottomed cylindrical work W is uniformly and sufficiently quenched over the entire length and circumference.

In the above embodiment, when the high-frequency induction heating coil 10 and the cooling jacket 20 rise inside the bottomed cylindrical work W, the lower part of the quenching liquid discharge pipe 40 is placed inside the bottomed cylindrical work W. However, the quenching liquid discharge pipe 40 may be raised together with the high frequency induction heating coil 10 and the cooling jacket 20. In that case, the quenching liquid in the bottomed cylindrical work W increases with the rise of the quenching liquid discharge pipe 40, but since the liquid level is maintained below the quenching liquid discharge pipe 40, The quenching liquid in the bottomed cylindrical work W does not come into contact with the heating part.

[0022]

[Effect of the device]

 As explained above, the inner surface quenching apparatus for a bottomed cylindrical work according to the present invention supports the bottomed cylindrical work with the bottom facing down, and a high-frequency induction heating coil and a cooling jacket are installed inside from above. After insertion, the inner surface of the bottomed cylindrical work piece is axially moved and quenched by moving the high-frequency induction heating coil and the cooling jacket relative to the bottomed cylindrical work piece in the axial direction. At this time, the cooling jacket also serves as a high-frequency induction heating coil, and even though the high-frequency induction heating coil and the cooling jacket have thickness, the bottom of the bottomed cylindrical work can be quenched. Further, the quenching liquid ejected from the cooling jacket into the bottomed cylindrical work is retained in the bottomed cylindrical work, but the quenching liquid is successively discharged from the bottomed cylindrical work by the quenching liquid discharge pipe. Since it is discharged to the inside, there is no risk of the quenching liquid coming into contact with the inner heating part of the cylindrical work with bottom before quenching. Therefore, the entire inner surface of the bottomed cylindrical work is uniformly and completely quenched. Further, since the high frequency induction heating coil and the cooling jacket are inserted from above into the bottomed cylindrical work, the workability when quenching the inner surface of the bottomed cylindrical work using this inner surface quenching device. Is good.

[Brief description of drawings]

FIG. 1 is a perspective view showing an example of an inner surface quenching apparatus for a cylindrical work with a bottom according to the present invention.

FIG. 2 is a sectional view taken along the line AA of FIG.

3 is a sectional view taken along the line BB of FIG.

FIG. 4 is a schematic diagram for explaining a quenching operation.

FIG. 5 is a sectional view showing a schematic structure of a conventional inner surface quenching apparatus for a cylindrical work with a bottom.

[Explanation of symbols]

 10 High Frequency Induction Heating Coil 20 Cooling Jacket 21 Jet Hole 30 Power Supply Water Supply Body 31, 32 Water Supply Pipe 34 Lead Plate 35 Water Supply Nozzle 40 Quenching Liquid Discharge Pipe 50 Conductor

Claims (3)

[Scope of utility model registration request] 1. An annular high-frequency induction heating coil which is inserted from above into a bottomed cylindrical work supported by a bottom to heat the inner surface of the work by high-frequency induction, and is connected and held below the high-frequency induction heating coil. And a high-frequency induction heating coil which is inserted into the cylindrical work with a bottom together with the high-frequency induction heating coil to heat the inner surface of the work by high-frequency induction, and on the outer surface of which ejection holes for ejecting the quenching liquid introduced therein are provided. The annular cooling jacket that also serves as the above, the high-frequency induction heating coil and the cooling jacket are inserted into the bottomed cylindrical work from above and the high-frequency induction heating coil and the cooling jacket are bottomed so as to be pulled out upward from the bottomed cylindrical work. A drive mechanism for moving the axially relative to the attached cylindrical work,
A quenching liquid discharge pipe that is inserted into the bottomed cylindrical work through the inside of the high-frequency induction heating coil and the cooling jacket and sucks and discharges the quenching liquid that remains below the cooling jacket in the bottomed cylindrical work. An inner surface quenching device for a cylindrical work with a bottom, comprising: 2. The high frequency induction heating coil is electrically connected to the cooling jacket, a cooling liquid is introduced into the high frequency induction heating coil, and the cooling liquid is transferred as a quenching liquid to the inside of the cooling jacket. The inner surface quenching device for a cylindrical workpiece according to claim 1, wherein 3. A water supply pipe that also functions as a lead is connected to one end of the high-frequency induction heating coil, and the other end of the high-frequency induction heating coil is connected to one end of a cooling jacket by a conductor that also functions as a water flow pipe. An inner surface quenching device for a cylindrical work according to claim 2, wherein a water supply pipe also serving as a lead is connected to the other end of the cylindrical work.