JP2014072143A - Sleeve heating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sleeve heating device related to an iron sleeve molded integrally with an aluminum engine block, and that can uniformly heat the sleeve in a short time, and that can eliminate the need of a heating furnace.SOLUTION: A sleeve heating device 3 comprises a straight line-shaped conductor 4 supplied with a high-frequency current. By loosely inserting the conductor 4 into a metal sleeve 1, an induction current is generated to heat the sleeve 1.

Description

  The present invention relates to a sleeve heating apparatus for heating a metal sleeve.

  Conventionally, in order to take out an iron sleeve formed integrally with an aluminum engine block from the engine block, it is known that after preheating the engine block, induction heating by a spiral coil or heating by a heater is performed. (See Patent Document 1).

JP 2008-23567 A

  However, in the induction heating using the spiral coil as in Patent Document 1, there is a problem that the shape of the coil is greatly affected in order to uniformly heat the sleeve and the entire engine block. Further, the heating by the heater has problems that it takes time to heat the engine block to a predetermined temperature and a heating furnace is required.

  SUMMARY OF THE INVENTION Accordingly, the present invention provides a sleeve heating apparatus that eliminates the above-described conventional problems, can uniformly heat a sleeve in a short time, and does not require a heating furnace.

  In order to achieve the above object, the configuration of the invention described in claim 1 includes a linear conductor to which a high-frequency current is supplied, and generates an induced current by loosely inserting the conductor into a metal sleeve. And heating the sleeve.

  According to a second aspect of the present invention, in addition to the first aspect of the present invention, at least three conductors are divided into an upper electrode and a lower electrode, and any one of the upper electrode and the lower electrode is divided. One of them is provided so as to be able to contact and separate from the other through the sleeve, and the base ends of the adjacent upper electrodes and the base ends of the adjacent lower electrodes are alternately electrically connected, Each conductor is connected in series with the lower electrode in contact with the lower electrode.

  The invention described in claim 3 is characterized in that, in addition to the invention described in claim 1 or 2, the conductor is a pipe material.

  According to the present invention, the sleeve can be heated uniformly in a short time. In addition, since no heating furnace is required, the equipment can be downsized.

  According to the invention described in claim 2, in addition to the invention described in claim 1, in the engine block in which a plurality of sleeves are inserted, each sleeve can be heated evenly in a short time.

  According to the invention described in claim 3, in addition to the invention described in claim 1 or 2, it is possible to supply cooling water to the inside, and it is possible to heat at a high temperature by preventing dissolution of the conductor itself. It is. In addition, the conductor can be used for a long time or repeatedly.

It is a block diagram of a sleeve heating apparatus. It is explanatory drawing which shows the heating process by a sleeve heating apparatus.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

First, as shown in FIG. 1, the sleeve heating device 3 inserts a rod-shaped conductor 4 into the sleeve 1 with respect to the engine block 2 in which the sleeve 1 is inserted, and then causes a current to flow through the conductor 4. Then, an induction current is generated in the sleeve 1 to heat the sleeve 1.
The sleeve heating device 3 includes a vertical axis moving mechanism 10 that moves the lower electrode 12 that is one of the conductors 4 in the vertical direction indicated by the arrow, and a horizontal direction that is indicated by the arrow that is the upper electrode 25 that is the other of the conductors 4 The horizontal movement mechanism 20 that moves in the vertical direction, the door mechanism 30 that opens and closes the door 32 in the vertical direction, and the stage 11 on which the engine block 2 is placed and fixed.

Among them, the vertical axis moving mechanism 10 is provided with a vertically extendable cylinder 18, and a base 13 is attached to the tip of a shaft 17 of the cylinder 18 via an L-shaped angle 16. The base 13 moves up and down on the rail guide 15 by the expansion and contraction of the shaft 17.
On the base 13, one end of the lower electrode 12 is inserted, and a portion protruding downward from the base 13 is fixed by a current-carrying plate 14 so that the lower electrode 12 stands up. Further, as shown in FIG. 2 (a), holes 18a, 18b,... Through which the lower electrodes 12a, 12b,.

Next, a horizontally movable cylinder 21 is disposed in the horizontal movement mechanism 20, and a base 24 is attached to the tip of a shaft 22 of the cylinder 21 via an L-shaped angle 23. The base 24 moves to the left and right on the rail guide 26 by the expansion and contraction.
On the sleeve 1 side of the base 24, the upper electrode 25 (25a to 25d) ends are fixed by an energizing plate 28 in a protruding state. On the other hand, a power cable 27 that connects a power panel (not shown) is connected to the opposite end of the upper electrode 25.

In addition, the door mechanism 30 is provided with a cylinder 31 that can be expanded and contracted in the vertical direction indicated by an arrow, and a safety cover 34 is attached to the tip of the shaft 32 of the cylinder 31 via an L-shaped angle 33. Yes.
Next to the sleeve heating device 3, a robot arm mechanism 50 for moving the sleeve 1 is arranged in the sleeve heating device 3, and the robot arm mechanism 50 can hold the sleeve 1 at the tip. An arm 51 is provided.

The sleeve 1 is heated by the sleeve heating device 3 configured as described above as follows.
First, in order to place the engine block 2 in which the sleeve 1 is inserted into the sleeve heating device 3, the safety cover 34 is lowered from the state shown in FIG. In this case, when the shaft 32 of the cylinder 31 is housed in the cylinder 31, the safety cover 34 is lowered via the angle 33 attached to the tip of the shaft 32.
Thereafter, after the engine block 2 is placed on the stage 11 by the arm 51 of the robot arm mechanism 50, the safety cover 34 is raised by the shaft 32 extending upward, and the arm 51 is heated while the sleeve 1 is heated. Prevent entry into the device 3.

  Next, when the shaft 22 extends toward the right direction indicated by the horizontal arrow in FIG. 1 by the cylinder 21, the energization plate 24 moves on the rail guide 26. In this case, the upper electrode 25 moves to the center of the axis of the lower electrode 12 (position just above the opening of the sleeve 1) and stops.

Thereafter, when the shaft 17 is housed in the upward direction indicated by the vertical arrow in FIG. 1 by the cylinder 18, the base 13 rises on the rail guide 15 via the angle 16 attached to the tip of the shaft 17.
At this time, since the lower electrode 12 (12a to 12d) whose end is fixed on the base 13 also rises from the position shown in FIG. 2 (a), it is inserted into the sleeve 1 (1a to 1d). Become. When the base 13 further rises, as shown in FIG. 2B, the tip of the lower electrode 12 rises to a position where it comes into contact with the upper electrode 25 (25a to 25d) and stops.

At this time, since the lower electrode 12a contacts the upper electrode 25a, it is possible to energize the upper electrode 25a to the lower electrode 12a. Similarly, it is possible to energize the lower electrode 12b to the upper electrode 25b, the upper electrode 25c to the lower electrode 12c, and the lower electrode 12d to the upper electrode 25d.
Further, since the lower electrode 12a and the lower electrode 12b are fixed to each other through the current-carrying plate 14a, the lower electrode 12a and the lower electrode 12b can be energized between the lower electrodes 12a and 12b. Also in 25b and the upper electrode 25c, since each edge part is being fixed together via the electricity supply plate 28b, electricity supply between the upper electrodes 25b and 25c is also possible.
In this way, the conductors from the upper electrode 25a to the upper electrode 25b and the conductors from the lower electrode 12b to the lower electrode 12c are electrically connected to each other. Similarly, electrical connection is made between conductors from the upper electrode 25c to the upper electrode 25d.

In this way, as shown in FIG. 2B, when the conductors are electrically connected in series and then a high frequency current is supplied from the power supply panel (not shown) to the power cable 27a, the high frequency current is converted into the power cable. After flowing from the upper electrode 25a to the lower electrode 12a through 27a, it flows from the lower electrode 12a to the lower electrode 12b via the energizing plate 14a.
Thereafter, the high-frequency current flows from the lower electrode 12b to the upper electrode 25b, and then flows from the upper electrode 25b to the upper electrode 25c via the energization plate 28b. Similarly, after the upper electrode 25c, the high-frequency current flows between the upper electrode 25 and the lower electrode 12 and flows from the power cable 27b to the power panel side.

As a result, when a high-frequency current flows between the upper electrode 25 and the lower electrode 12, a magnetic flux is generated in the conductor 4 (4a to 4d).
Here, the iron sleeve 1 has a relative permeability: μs of 100 to 1000, whereas the aluminum engine block 2 has a relative permeability of 1, so that the difference in relative permeability is about 100. Since it is more than twice, most of the magnetism is interrupted by the sleeve 1 and flows through the sleeve 1. Since the high-frequency current flows in the axial direction of the electrode, the magnetic flux is uniformly generated in the circumferential direction of the electrode, and an induction current is generated in the axial direction of the sleeve 1 to perform heating. On the other hand, the heating of the sleeve 1 in the circumferential direction is performed uniformly since the supply of the high-frequency current is stable.

When a high frequency current is supplied to the conductor 4 in this way, an induction current is generated in the sleeve 1, whereby the sleeve 1 is heated and the temperature of the sleeve 1 rises. Since the sleeve 1 is inserted into the engine block 2, heat (Joule heat) generated in the sleeve 1 is transferred to the engine block 2 and the engine block 2 is also heated.
Thereafter, when the temperature of the sleeve 1 and the engine block 2 rises, the melting temperature of iron is 1500 ° C. or higher, whereas the melting temperature of aluminum is about 650 ° C. Therefore, the iron sleeve 1 is made of aluminum. The engine block 2 is not melted before the engine block 2, and the engine block 2 is melted earlier, so that the melting starts from the vicinity of the sleeve 1 of the engine block 2. In this way, when it is measured by a temperature sensor (not shown) that the heating of the sleeve 1 has reached a preset temperature, the supply of the high-frequency current is stopped and the heating ends.
Moreover, since the upper electrode 25 and the lower electrode 12 are copper pipe materials with high heat conductivity, they are structures which prevent melt | dissolution of the conductor 4 itself by supplying cooling water inside (not shown). ).

Next, the shaft 17 extends downward by the cylinder 18, the base 13 moves down on the rail guide 15, and the upper electrode 25 moves to the position shown in FIG.
Thereafter, when the shaft 22 is housed in the left direction by the cylinder 21, the energizing plate 24 moves on the rail guide 26, and the lower electrode 12 moves to the position shown in FIG.

Next, when the shaft 32 of the cylinder 31 is stored downward to the position shown in FIG. 1, the safety cover 34 is lowered via the angle 33 attached to the tip of the shaft 32. Thereafter, the heating of the sleeve 1 by the sleeve heating device 3 is completed by removing the engine block 2 from the stage 11 by the robot arm mechanism 50.
At this time, since the engine block 2 starts to melt from the vicinity of the sleeve 1 due to heating of the induction current, only the sleeve 1 inserted into the engine block 2 is extracted, and the sleeve 1 and the engine block 2 are separated. Is called.

  As described above, the sleeve heating device 3 includes the linear conductor 4 to which a high-frequency current is supplied. The sleeve 4 is heated by inserting the conductor 4 into the metal sleeve 1 to generate an induced current. Thus, the sleeve 1 can be heated evenly in a short time. In addition, since no heating furnace is required, the equipment can be downsized.

  Further, at least three conductors 4, 4... Are divided into an upper electrode 25 and a lower electrode 12, and one of the upper electrode 25 and the lower electrode 12 is connected to the other through the sleeve 1. The base electrodes of the adjacent upper electrodes 25 and the base ends of the adjacent lower electrodes 12 are alternately connected to each other in a state where the upper electrode 25 and the lower electrode 12 are in contact with each other. Since the conductors 4 are connected in series, in the engine block 2 in which the plurality of sleeves 1, 1... Are inserted, the sleeves 1 can be evenly heated in a short time.

  In addition, since the conductor 4 is a pipe material, cooling water can be supplied to the inside, and the conductor 4 itself can be prevented from being melted and heated at a high temperature. Further, the conductor 4 can be used for a long time or repeatedly.

  The configuration of the sleeve heating device 3 of the present invention is not limited to the aspect of the above-described embodiment, and the configuration such as the shape and arrangement of the electrodes and the current-carrying plate is necessary without departing from the spirit of the present invention. It can be changed as appropriate according to the situation.

  For example, the upper electrode 25 and the lower electrode 12 do not necessarily need to be made of copper, and may be changed to other materials as long as they generate an induced current by flowing a high-frequency current and heat the sleeve 1, It can be changed as appropriate. In addition, the current-carrying plate 14 and the current-carrying plate 28 may be made of copper or other materials, and the cooling water may be supplied to the inside.

  In addition, the heating of the sleeve 1 by the sleeve heating device 3 is not only finished in a state where the vicinity of the sleeve 1 of the engine block 2 is melted, but is also finished in a state where the entire engine block 2 is melted and only the sleeve 1 remains. They may be changed as appropriate.

  Furthermore, when the heating temperature reaches a predetermined temperature, not only the supply of the high-frequency current is stopped and the heating is terminated, but the supply of the high-frequency current may be stopped when a certain heating time has elapsed.

  1 .. Sleeve 2 .. Engine block 3.. Sleeve heating device 4.. Conductor 10.. Vertical axis moving mechanism 11.. Stage 12 .. Lower electrode 13. · Current-carrying plate, 15 ·· Rail guide, 16 ·· Angle, 17 ·· Shaft, 18 ·· Cylinder, 20 ·· Horizontal movement mechanism, 21 ·· Cylinder, 22 ·· Shaft, 23 ·· Angle, 24 · -Base, 25-Upper electrode, 26-Rail guide, 27-Power cable, 28-Current-carrying plate, 30-Door mechanism, 31-Cylinder, 32-Shaft, 33-Angle, 34- -Safety cover, 50 ... Robot arm mechanism, 51 ... Arm.

Claims (3)

  A sleeve heating apparatus comprising a linear conductor to which a high-frequency current is supplied, and heating the sleeve by generating an induced current by loosely inserting the conductor into a metal sleeve.   The at least three conductors are divided into an upper electrode and a lower electrode, and one of the upper electrode and the lower electrode is provided so as to be able to contact and separate from the other through the sleeve, and adjacent to each other. The base ends of the upper electrodes and the base ends of the lower electrodes adjacent to each other are alternately electrically connected so that the conductors are connected in series with the upper electrode and the lower electrode in contact with each other. The sleeve heating apparatus according to claim 1, wherein   The sleeve heating device according to claim 1, wherein the conductor is a pipe material.

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