JP5180463B2 - Cylinder block quenching device and cylinder block manufacturing method - Google Patents

Description

  The present invention relates to a cylinder block quenching apparatus and a cylinder block manufacturing method in which an induction heating coil is inserted into an opening of a cylinder block, an induction current is generated and heated on an inner wall of the opening, and quenching is performed.

A cylinder block quenching apparatus using high-frequency induction quenching is known.
For example, Patent Document 1 discloses a quenching apparatus that performs high-frequency induction quenching on an inner wall (hereinafter simply referred to as a cylinder inner wall) of an opening of a cylinder block of an internal combustion engine.
The cylinder block quenching device disclosed in Patent Document 1 quenches the inner wall of the cylinder in the form of spots. The cylinder block quenching device disclosed in Patent Document 1 has a function of moving the induction heating coil in the vertical direction and the rotational direction.

Specifically, the cylinder block quenching device disclosed in Patent Document 1 includes a lifting platform, and a disk is rotatably attached to the lifting platform. A transformer is mounted on the disk.
An induction heating coil is suspended from the transformer. The induction heating coil heats a specific height portion of the cylinder inner wall in a broken line shape.

In the cylinder block quenching device disclosed in Patent Document 1, the elevator base is lowered, the induction heating coil is inserted into the opening of the cylinder, and a high frequency current is supplied to the induction heating coil to provide a specific height of the cylinder inner wall. Is heated in a broken line shape. Then, after the current supply to the induction heating coil is stopped, it is rapidly cooled, and the inner wall of the cylinder is quenched into spots. Then, the elevator platform is raised and lowered, and the disk on the elevator platform is rotated to slightly rotate the induction heating coil. Thereafter, a high frequency current is again supplied to the induction heating coil to heat a part of the inner wall of the cylinder and rapidly cool it. This operation is repeated to distribute the spot-like hardened portions on the inner wall of the cylinder in a plane and staggered manner.
Japanese Patent Laid-Open No. 9-3531

The conventional cylinder block quenching apparatus can raise and lower the induction heating coil and further rotate it, so that the quenching portions can be distributed in a staggered manner on the inner wall of the cylinder.
By the way, although the quenching pattern of the cylinder in the prior art was such that the spot-like quenching portion was distributed in a planar shape as described above, the present inventors have found that the quenching pattern when quenching the cylinder inner wall is as follows. Invented a spiral quenching pattern.
That is, in the prior art, the quenching pattern on the inner wall of the cylinder is such that the spot-like quenching portions are distributed side by side in the row direction and the column direction, or these are arranged in a staggered manner. It was. On the other hand, the present inventors invented a structure having a quenching pattern in which the quenching portions are spirally continued.
The cylinder having the quenching portion spirally formed has a small oil pool in the spiral portion, and can strengthen the oil film on the inner wall of the cylinder, and has an effect of preventing the cylinder from being worn and seized.

However, when trying to mass-produce quenching with the above-described quenching pattern, a new problem was encountered. Specifically, it has been difficult to realize the above-described quenching pattern using an existing cylinder block quenching apparatus.
The cylinder block hardening apparatus disclosed in Patent Document 1 mounts a transformer on a disk on a lifting platform, and rotates the disk to slightly rotate the induction heating coil. That is, the conventional cylinder block quenching apparatus rotates the induction heating coil together with the transformer. Therefore, the cylinder block quenching device of the prior art entangles the power supply line to the transformer during rotation.
Also, since the transformer has a considerable weight, it has been difficult to rotate it smoothly. That is, in order to form a quenching pattern with an accurate spiral trajectory, it is desirable to rotate the induction heating coil at a constant speed. In addition, vibration of the induction heating coil should be suppressed.

On the other hand, since the weight of the part to be rotated is large in the conventional cylinder block quenching apparatus, the rise of the angular velocity at the start of rotation is slow. Also, the rotation of the induction heating coil tends to lack smoothness, and the induction heating coil may vibrate.
In other words, when forming a spot-like quenching pattern as in the prior art, the induction heating coil may be moved in a state where energization to the induction heating coil is stopped, but when a continuous spiral pattern is drawn. The induction heating coil must be rotated while the induction heating coil is energized. Therefore, in order to draw a continuous spiral pattern, smoother rotation and vibration suppression are required than ever before.

  Accordingly, the present invention focuses on the above-described problems of the prior art, and an object of the present invention is to develop a cylinder block quenching apparatus that can smoothly move the induction heating coil in the rotation direction and the swinging direction.

  According to a first aspect of the present invention for solving the above-described problem, in the quenching apparatus for a cylinder block that quenches the inner wall of the cylinder block, a stationary coil to which an alternating current is supplied and the stationary coil A movable coil that is electromagnetically coupled to the stationary coil and generates an induction current, an induction heating coil that can be inserted into the opening of the cylinder block, and the induction heating coil relative to the cylinder block An axial movement means for moving the stationary coil in the axial direction integrally with the movable coil, and a coil operating means for rotating the induction heating coil within the opening of the cylinder block. The induction heating coil is connected to the movable coil, the movable coil is rotatable with respect to the fixed coil, and the coil operating means is connected to the induction heating coil. A quenching apparatus of the cylinder block, characterized in that the movable coil when rotating is possible follow.

Here, “the movable coil can follow when the coil operating means rotates the induction heating coil” means “the movable coil can move when the induction heating coil is rotated, and the movable coil is guided. It does not become an obstacle to operating the heating coil. Therefore, in addition to the case where the coil operating means rotates the induction heating coil and the movable side coil follows the movement of the induction heating coil, the induction heating coil rotates or postures indirectly by rotating the movable side coil. This includes cases where changes are made.
“Move the induction heating coil in the axial direction relative to the cylinder block” means that only the induction heating coil moves in the axial direction, only the cylinder block moves in the axial direction, and induction heating. This includes the case where both the coil and the cylinder block move in the axial direction.
In the cylinder block quenching apparatus of the present invention, the induction heating coil is inserted into the opening of the cylinder block to quench the inner wall.
The cylinder block quenching apparatus of the present invention has a fixed coil and a movable coil, and supplies an alternating current to the fixed coil to generate an induced current in the movable coil. This induced current is an alternating current as in the fixed coil. In the present invention, the induced current generated in the movable coil is passed through the induction heating coil to heat the inner wall of the cylinder block.
In the present invention, the movable coil is rotatable with respect to the fixed coil. Further, in the cylinder block quenching apparatus of the present invention, the fixed side coil and the movable side coil are merely electromagnetically coupled, and the feed line is not connected. Therefore, even if the movable coil is rotated, the power supply line is not twisted. Furthermore, in the cylinder block quenching apparatus of the present invention, it is the movable coil that rotates, and there is no need to rotate the transformer. Therefore, the weight of the rotating part is light and the operation is smooth.
The cylinder block quenching apparatus of the present invention can move the induction heating coil in the axial direction and the rotation direction, so that the heating portion of the induction heating coil can be moved along a spiral locus.

  The invention according to claim 2 is characterized in that the fixed side coil has an annular portion, and the movable side coil is disposed within the annular portion of the fixed side coil. Input device.

In the quenching apparatus for a cylinder block according to the present invention, the movable side coil is in the fixed side coil. Therefore, it is easy to rotate the movable coil. In addition, there is little leakage of magnetic flux and high efficiency.
The annular shape of the stationary coil is preferably an annular shape, but may be an ellipse or a polygon such as a quadrangle.

  According to a third aspect of the present invention, there is provided a cylinder block quenching apparatus for quenching an inner wall of an opening of a cylinder block, a stationary coil supplied with an alternating current, a stationary coil disposed in the vicinity of the stationary coil, A movable coil that is electromagnetically coupled to generate an induction current, an induction heating coil that can be inserted into the opening of the cylinder block, and an axial direction that moves the induction heating coil in the axial direction relative to the cylinder block Moving means and coil operating means for rotating the induction heating coil within the opening of the cylinder block, the induction heating coil is connected to the movable coil, and the movable coil is rotatable with respect to the fixed coil The movable coil can follow when the coil operating means rotates the induction heating coil, and both the fixed coil and the movable coil are annular, The fixed coil is arranged outside the movable coil, the fixed coil is longer in the axial direction than the movable coil, and the movable coil is movable in the axial direction within the space surrounded by the fixed coil. There is provided a quenching apparatus for a cylinder block.

  In the cylinder block quenching apparatus of the present invention, the movable side coil also has a degree of freedom in the axial direction. Since the fixed side coil employed in the present invention is longer in the axial direction than the movable side coil, the electromagnetic coupling with the fixed side coil is maintained even if the movable side coil is moved within the space surrounded by the fixed side coil. Is done.

  According to a fourth aspect of the present invention, the cylinder block according to any one of the first to third aspects has a cooling device, and the portions heated by the induction heating coil are sequentially cooled by the cooling device. It is a quenching device.

  According to the present invention, since the heated part can be cooled immediately after heating, quenching can be performed moderately.

  The cooling device includes an opening for injecting the coolant, and the opening moves in the axial direction together with the induction heating coil, and the above-described invention can be realized by enabling the heating part to be sequentially cooled (Claim 5).

  The cooling device is a tank containing a cooling liquid, and the liquid level of the cooling liquid may be raised and lowered to sequentially cool the heated portion.

  The cooling device may be a tank containing a coolant, and may be configured such that either the tank or the cylinder block can be moved up and down to sequentially cool the heated portion.

  In the context of the present invention, the induction heating coil preferably moves axially while rotating.

  Further, the invention relating to the manufacturing method uses the cylinder block quenching apparatus according to any one of claims 1 to 7, and performs quenching by moving the induction heating coil in the axial direction while rotating the induction heating coil. A block manufacturing method (claim 8).

According to the manufacturing method of the eighth aspect , a helical quenching pattern can be realized as the quenching pattern when quenching the cylinder inner wall surface.
According to these inventions, the frequency of cooling the inner wall of the cylinder block opening and the frequency of starting up the induction heating coil are low, and the time required for the entire quenching operation is short.
That is, in the case of the prior art, as described above, a high-frequency current is supplied to the induction heating coil to heat the inner circumference of the cylinder inner wall at a specific height in a broken line shape, and once the current supply to the induction heating coil is stopped. Cool quickly. Then the elevator is moved up and down, the disk on the elevator is further rotated to slightly rotate the induction heating coil, and the high frequency current is supplied again to the induction heating coil in this posture to heat a part of the inner wall of the cylinder and rapidly cool it. To do.
According to the prior art method, heating and quenching must be repeated in this way. For this reason, the time required for the entire work becomes long.
On the other hand, in the invention of the present application, since the heated portion is cooled while drawing a spiral trajectory, the number of times of cooling is small compared to quenching the whole.
That is, according to the measures of the prior art, it is necessary to cool each time a row is heated, and the number of times of cooling is required by the number of rows.
In contrast, in the present invention, since there is no concept of a row, the cooling frequency is low.

In the cylinder block manufactured by the manufacturing method according to the eighth aspect , the quenching portion is continuous in a spiral shape. Therefore, a part with high hardness will continue spirally. Therefore, a small oil reservoir can be formed in the spiral portion, the oil film on the cylinder inner wall can be strengthened, and there is an effect of preventing wear and seizure of the cylinder inner wall.
That is, the hardened part has higher hardness than the unquenched part. For this reason, when the sliding of the piston in the cylinder is repeated due to the running-in of the engine or the like, the hardened part protrudes very slightly. Therefore, when the piston is operated, a slight amount of engine oil remains in the quenched portion. And according to this invention, since a quenching part will continue spirally, engine oil will continue over a wide range and will make a strong oil film on the inner wall of a cylinder.
Therefore, the durability of the engine is improved.

In the cylinder block quenching apparatus of the present invention, the feed line does not get in the way when the induction heating coil is rotated. Further, the cylinder block quenching apparatus according to the present invention has a smooth operation because the weight of the movable part is small.
According to the cylinder block manufacturing method of the present invention, an intermittent oil film (oil reservoir) is formed in the axial direction of the inner wall of the opening, and the cylinder is excellent in lubricity, seizure prevention due to piston sliding, and wear resistance. Blocks can be realized. In addition, according to the method for manufacturing a cylinder block of the present invention, the overall work time can be shortened.

Embodiments of the present invention will be further described below.
FIG. 1 is a schematic perspective view conceptually showing a cylinder block quenching apparatus according to an embodiment of the present invention. 2 is a front view of an induction heating coil employed in the cylinder block quenching apparatus of FIG. FIG. 3 is a front view of a modification of the induction heating coil.
A cylinder block quenching apparatus 1 according to an embodiment of the present invention includes an XY table 3 and a lifting table 5 in a base 2 as shown in FIG. 1, and the lifting table 5 has a transformer 6, a fixed coil 7, and a movable side. A coil 8 is attached, and an induction heating coil 10 is attached to the movable coil 8. Further, the lifting table 5 is provided with a motor (coil operating means) 11 for rotating the induction heating coil 8.
This will be sequentially described below.

  The base 2 is a surface plate and is the same as the base of a normal machine. The XY table 3 is the same as a known one, and has a ball screw and a motor (not shown), and can hold the cylinder block 20 and move it in a plane.

  The lifting table 5 moves up and down with respect to the base 2. That is, the lifting table 5 is lifted and lowered by the lifting device (axial movement means) 21. In the present embodiment, the lifting device 21 includes a ball screw 22 and a motor 23. The ball screw 22 is provided in a direction perpendicular to the base 2 and is rotatable with respect to the base 2. The motor 23 is a motor capable of low-speed rotation, such as a geared motor, and can rotate the ball screw 22.

The elevating table 5 has a female screw member 25, and the female screw member 25 is screwed with the ball screw 22 described above. Further, the elevating table 5 is provided with a guide (not shown), and can be moved up and down while maintaining a horizontal posture by the guide.
Therefore, the elevating table 5 is moved up and down by rotating the motor 23 while maintaining the horizontal posture.

The lift table 5 is provided with an opening 27 as shown in FIG.
Further, a transformer 6 is placed on the lifting table 5. The transformer 6 supplies electric power required for quenching and generates high-frequency alternating current. That is, the transformer 6 has a primary coil and a secondary coil inside, inputs a high frequency current to the primary side coil, and generates a high frequency current on the secondary coil side.

The stationary coil 7 is a circular annular one-turn coil, and is fixed on the opening 27 of the elevating table 5 by a support member (not shown). The stationary coil 7 is fixed integrally with the lifting table 5 and does not move. The fixed side coil 7 is connected to the secondary side coil of the transformer 6 and is supplied with a high frequency current.
The fixed coil 7 and the movable coil 8 described later are both made by bending a tube made of a metal such as copper, and a conduction hole (not shown) is communicated with the center. Cooling water flows through the conduction hole.
In the present embodiment, the fixed side coil 7 is formed using a rectangular pipe having a rectangular cross section, but the cross sectional shape of the coil wire of the fixed side coil 7 may be a circle or an ellipse.
A motor (coil operating means) 11 is attached to the lower surface of the lifting table 5. Further, there is a small gear 36 that receives power transmission from the motor 11.

The movable coil 8 includes a coil main body 42, a conductive part 30, and a gear part 31.
The coil main body 42 of the movable coil 8 includes a circular annular one-turn coil portion 33 and a horizontal linear portion 35 from both ends of the one-turn coil portion 33 toward the center of the one-turn coil portion 33. In addition, although the horizontal direction linear part 35 is a thing in which two conductors are located in a line and go to a center direction, between both is insulated.
The outer diameter of the one-turn coil portion 33 is slightly smaller than the inner diameter of the fixed coil 7 described above.

The conductive portion 30 is a conductor that extends vertically downward from the end portion of the horizontal linear portion 35. The conductive portion 30 is linear and its position coincides with the central axis of the one-turn coil portion 33.
The coil body portion 42 and the conductive portion 30 of the movable coil 8 are made by bending a tube made of a metal such as copper, and a conduction hole (not shown) communicates with the central portion. Cooling water flows through the conduction hole.
The gear unit 31 is a gear unit that is attached to the periphery of the conductive unit 30 via an insulator (not shown). Further, a small gear 36 of a motor (coil operating means) 11 provided on the lower surface of the lifting table 5 is engaged with the gear portion 31.

As shown in FIG. 1, the movable side coil 8 has a coil main body 42 inside the fixed side coil 7. That is, the coil body 42 of the movable coil 8 is on the same plane as the fixed coil 7, and the center line of the coil body 42 of the movable coil 8 coincides with the center line of the fixed coil 7.
As described above, since the outer diameter of the one-turn coil portion 33 of the movable coil 8 is slightly smaller than the inner diameter of the fixed coil 7, the movable coil 8 is disposed in the vicinity of the fixed coil 7. Become. The position of the movable coil 8 and the fixed coil 7 is a distance that can be electromagnetically coupled between them.
The coil main body 42 of the movable coil 8 is rotatable with respect to the fixed coil 7. However, the coil main body 42 of the movable coil 8 is integrally fixed to the fixed coil 7 in the axial direction. Therefore, the coil main body 42 of the movable side coil is always on the same plane as the fixed side coil 7, and this positional relationship will not be lost. A method for supporting the movable coil 8 will be described later.

As shown in FIG. 2, the induction heating coil 10 includes a chrysanthemum-shaped annular one-turn coil portion 40 and a horizontal linear portion 41 that extends from both ends of the one-turn coil portion 40 toward the center of the one-turn coil portion 40.
The one-turn coil portion 40 is provided with convex portions 45 and concave portions 46 alternately, and the outer diameter of the convex portion 45 is slightly smaller than the inner diameter of the opening 70 of the cylinder block 20 (workpiece). The convex portions 45 of the one-turn coil portion 40 are provided at equal intervals.
The horizontal linear portion 41 is formed by two conductors arranged in a horizontal direction toward the center, but is insulated between the two. The terminal portion of the horizontal linear portion 41 is at the center of the one-turn coil portion 40.

The induction heating coil 10 is made by bending a square tube having a cross-sectional shape made of a metal such as copper, and a conduction hole (not shown) communicates with a central portion. Cooling water flows through the conduction hole.
The induction heating coil 10 employed in the present embodiment quenches the inner wall 71 of the opening 70 of the cylinder block 20, and the induction heating coil 10 is inserted into the opening 70 of the cylinder block 20 as will be described later.
In the present embodiment, since the induction heating coil 10 is provided with the convex portions 45 and the concave portions 46 alternately, the tip of the convex portion 45 is close to the inner wall 71 in the opening 70 of the cylinder block 20, and the inner wall 71 is heated.
The induction heating coil 10 may have a magnetic body attached to the recess 46 as shown in FIG. The same effect can be expected even if the magnetic body is attached at regular intervals without providing the recess.

  The induction heating coil 10 is connected to the conductive portion 30 of the movable coil 8 described above. That is, the horizontal linear portion 41 of the induction heating coil 10 is connected to the end of the conductive portion 30 of the movable coil 8. More specifically, the horizontal linear portion 41 of the induction heating coil 10 and the conductive portion 30 of the movable side coil 8 are both two tubular conductors, which are joined together mechanically and electrically. Has been. Further, the conduction hole of the induction heating coil 10 and the movable coil 8 communicates.

When using the quenching apparatus 1 of the cylinder block 20 of the present embodiment, power is supplied to the transformer 6 and a high-frequency current is generated on the secondary side of the transformer 6. This high frequency current is conducted to the fixed coil 7. As a result, the fixed coil 7 generates a magnetic field, and the magnetic flux passes through the coil body 42 of the movable coil 8. Therefore, an induced current is generated in the coil main body 42 of the movable coil 8. This induced current is a high-frequency alternating current.
Moreover, since the movable side coil 8 is connected to the induction heating coil 10, a high frequency current flows through the induction heating coil 10, and an induction current is generated in the cylinder block 20 in the close position to generate heat.
At this time, cooling water flows through each coil, and heat generation of the coil is suppressed.

In the quenching apparatus 1 of the cylinder block 20 of the present embodiment, not only can the induction heating coil 10 be moved up and down, but the induction heating coil 10 can also be rotated.
That is, when the induction heating coil 10 is moved up and down, the ball screw 22 of the lifting table 5 is rotated by the motor 23 and the lifting table 5 engaged with the ball screw 22 is moved up and down.
As a result, the fixed side coil 7 moves up and down. As described above, the coil main body 42 of the movable side coil 8 is integrally fixed to the fixed side coil 7 in the axial direction. As the coil 7 moves up and down, the movable coil 7 also moves up and down, and the induction heating coil 10 suspended from the movable coil 7 also moves up and down.

  Further, when the induction heating coil 10 is rotated, a motor (coil operating means) 11 provided on the lower surface of the lifting table 5 is rotated. As a result, the small gear 36 rotates. Here, although the movable side coil 8 is integrally fixed to the fixed side coil 7 in the axial direction, it has a degree of freedom in the rotational direction with respect to the fixed side coil 7. Therefore, when the motor (coil operating means) 11 is rotated, the small gear 36 is rotated, the gear portion 31 engaged with the small gear 36 is rotated, the movable coil 8 is rotated as a whole, and the induction heating coil 10 is rotated. To do. That is, in the present embodiment, when the coil operating means 11 rotates the induction heating coil 10, the movable coil 8 smoothly follows and no twisting or the like occurs.

The conceptual configuration of the quenching device 1 for the cylinder block 20 according to the present embodiment has been conceptually described above. However, when the quenching device 1 for the cylinder block 20 is actually designed, the insulation of each part is ensured and the support method is used. Ingenuity is necessary. FIG. 4 is a cross-sectional perspective view illustrating an example of a combination portion of the fixed side coil 7 and the movable side coil 8 of the quenching apparatus 1 of the cylinder block 20 according to the embodiment of the present invention.
4 that are the same as those shown in FIG. 1 are given the same reference numerals.

In the embodiment shown in FIG. 4, the stationary coil 7 is sandwiched and held between the holder member pieces 50 and 51. Between the holder member pieces 50 and 51 and the stationary coil 7, a member having insulating properties and heat insulating properties is interposed (not shown).
The inner wall side of the stationary coil 7 is exposed inside the holder member pieces 50 and 51.
The holder member pieces 50 and 51 have a flange portion 53, and the flange portion 53 is screwed to the edge portion of the opening 27 of the lifting table 5.
Therefore, the stationary coil 7 is fixed to the lifting table 5 via the holder member pieces 50 and 51. The stationary coil 7 moves integrally with the lifting table 5.

Further, rail members 55 and 56 are laid in an annular shape in the vicinity of the inner peripheral ends of the holder member pieces 50 and 51 and on the inner side thereof. The rail members 55 and 56 are made of an insulator.
The coil body 42 of the movable coil 8 is disposed between the rail members 55 and 56.
Therefore, the coil main body 42 of the movable side coil 8 moves integrally in the axial direction with respect to the fixed side coil 7 and has a degree of freedom in the rotation direction.

Next, the operation of the quenching apparatus 1 for the cylinder block 20 according to the above-described embodiment will be described with respect to typical usage examples.
The above-described quenching apparatus 1 for the cylinder block 20 uses the cylinder block 20 of the internal combustion engine as a workpiece, and quenches the inner wall 71 of the cylinder bore (inside the opening 70).
FIG. 5 is a cutaway perspective view of the inner wall 71 of the cylinder bore (inside the opening 70) quenched by the quenching device 1 of the cylinder block 20 of FIG. FIG. 6 is a development view of the cylinder bore.

If the quenching apparatus 1 of the cylinder block 20 of this embodiment is used, the quenching pattern of the inner wall 71 of the cylinder bore 70 can be made spiral.
That is, when quenching the inner wall 71 of the cylinder bore 70 using the quenching device 1 of the cylinder block 20 of the present embodiment, the cylinder block 20 as a workpiece is fixed to the XY table 3 and the XY table 3 is fixed. The cylinder bore (opening 70) is moved directly below the induction heating coil 10 by operating.

Subsequently, the lifting table 5 is lowered, and the induction heating coil 10 is inserted to the innermost part (lower end) in the opening 70 of the cylinder block 20.
The transformer 6 is energized. As a result, a magnetic field is generated in the stationary coil 7, an induction current is generated in the coil body 42 of the movable coil 8, and a high-frequency current flows through the induction heating coil 10. Here, since the convex portion 45 is provided in the induction heating coil 10, a portion adjacent to the convex portion 45 is red hot.
In this state, the lifting table 5 is raised, and at the same time, a motor (coil operating means) 11 provided on the lower surface of the lifting table 5 is rotated to rotate the induction heating coil 10.
As a result, the convex portion 46 of the induction heating coil 10 moves along a spiral locus. Therefore, a reddish portion having a spiral locus is formed on the inner wall 71 of the cylinder bore (in the opening 70). And the said red discoloration part is cooled by water discharge etc. and quenching is performed. As a result, a helical quenching locus 72 as shown in FIGS.

It is desirable to provide a control device that can automatically perform the series of steps described above. FIG. 7 is a flowchart showing the operation of the quenching apparatus 1 of the cylinder block 20 of FIG.
Based on the signal from the control device, the following process is automatically performed.
(1) Lowering of induction heating coil 10 (2) Energization to fixed side coil 7 (3) Ascending while rotating induction heating coil 10 (4) Stopping energization to fixed side coil 7 (5) Opening of cylinder block 20 Cooling of the inner wall 71 in 70, that is, as in the flowchart of FIG. 7, the induction heating coil 10 is lowered into the opening 70 of the cylinder block 20 in step 1. In subsequent step 2, the stationary coil 7 is energized. As a result, a high frequency current flows through the induction heating coil 10 to heat the inner wall 71 of the cylinder bore (in the opening 70).
In a subsequent step, the induction heating coil 10 is raised while rotating. When the induction heating coil 10 reaches the vicinity of the end of the opening 70 of the cylinder block 20, the energization to the stationary coil 7 is automatically stopped (step 4), and the reddish part is cooled by water discharge or the like (step 5). ).

  The energization stop of the stationary coil 7 and the cooling of the inner wall may be performed after heating over the entire length of the cylinder bore in the axial direction. However, when the total length of the cylinder block 20 is long, for example, one third of the total length. It may be heated one by one, the energization to the stationary coil 7 may be stopped, and cooled by water discharge or the like.

In the above-described embodiment, the heating portion is cooled after the energization to the fixed coil 7 is stopped. However, when the cylinder block 20 is large, it is desirable to follow induction heating and cool the heating portion.
8 to 10 show the operation of the quenching apparatus 1 for the cylinder block 20 according to the embodiment of the present invention. FIG. 8A is a sectional view of the cylinder block 20 at the start of quenching, and FIG. It is sectional drawing of the cylinder block 20 in.

In the quenching device 78 of the cylinder block 20 shown in FIG. 8, a cooling water pipe 80 is provided below the induction heating coil 10. The cooling water pipe 80 is attached to a support member (not shown) of the induction heating coil 10 and moves up and down integrally with the induction heating coil 10.
A number of nozzles (openings) 81 are provided in the cooling water pipe 80. Further, the coolant is supplied to the coolant pipe 80 from a coolant tank (not shown), and the coolant is sprayed from the nozzle 81 toward the inner wall 71 of the cylinder block 20.

  In the quenching device 78 of the cylinder block 20 shown in FIG. 8, the induction heating coil 10 is lowered into the opening 70 of the cylinder block 20, the fixed coil 7 is energized, and a high frequency current flows through the induction heating coil 10, so that the inner wall of the cylinder bore While 71 is heated, the coolant is supplied to the cooling water pipe 80.

  Then, the induction heating coil 10 is raised while rotating. As a result, the convex portion 46 of the induction heating coil 10 moves along a spiral trajectory. In this embodiment, the cooling water pipe 80 moves up and down integrally with the induction heating coil 10, and the coolant is injected from the nozzle 81 (opening) of the cooling water pipe 80 toward the inner wall 71 of the cylinder block 20. The heated part is cooled sequentially.

In the cylinder block quenching device 78 shown in FIG. 8, the cooling water pipe 80 is used as a cooling device. However, the cooling device is not limited to this configuration, and a tank containing a cooling liquid may be used. Conceivable.
9 and 10 show a configuration using a cooling liquid tank as a cooling device.
The cylinder block quenching device 83 shown in FIG. 9 includes a coolant tank 85 as a cooling device. A pump 86 is connected to the coolant tank 85, and the coolant is taken in and out by the pump 86. That is, in the present embodiment, the liquid level of the coolant in the coolant tank 85 can be raised and lowered by driving the pump 86.

Also in the quenching device 83 of the cylinder block 20 shown in FIG. 9, the induction heating coil 10 is lowered into the opening 70 of the cylinder block 20, the fixed coil 7 is energized, and a high-frequency current flows through the induction heating coil 10 to cause the inner wall 71. Is heated. And the induction heating coil 10 is raised while rotating. As a result, the convex portion 46 of the induction heating coil 10 moves along a spiral trajectory.
In the present embodiment, in parallel with the series of operations, the coolant is supplied to the coolant tank 85 by the pump 86, and the liquid level of the coolant gradually rises. It is preferable that the rising speed of the liquid level is substantially the same as the rising speed of the stationary coil 7.
Therefore, the liquid level of the coolant reaches the part heated by the induction heating coil 10, and the heated part is sequentially cooled.

  In the embodiment shown in FIG. 9, the configuration is such that induction heating is followed by raising the liquid level of the cooling liquid tank 85, but the cooling liquid tank 85 itself is raised or lowered, or the cylinder block 20 is raised and lowered to lower the cooling liquid. You may employ | adopt the structure immersed in the tank 85. FIG. FIG. 10 shows an example in which the cylinder block 20 is lowered and immersed in the coolant tank 85.

In the embodiment described above, the movable coil 8 has a degree of freedom only in the rotational direction, but may further have a degree of freedom in the ascending / descending direction (axial direction).
FIG. 11 is a conceptual diagram of a quenching device 60 of the cylinder block 20 according to another embodiment of the present invention. FIG. 12 is an explanatory view showing the operation of the quenching device 60 of the cylinder block 20 shown in FIG. 11, wherein (a) shows the case where the movable coil 8 is in the vicinity of the upper end, and (b) shows the movable A state where the side coil 8 is lowered is shown.

In FIG. 11, the same members as those in the previous embodiment are denoted by the same reference numerals.
In the hardening apparatus 60 shown in FIG. 11, the movable coil 8 has a degree of freedom in both the rotational direction and the axial direction.
In the quenching apparatus 60 shown in FIG. 11, the fixed side coil 61 has an annular shape, but its axial length is longer than that of the previous embodiment. It can also be raised and lowered in the axial direction.
In the present embodiment, since the fixed side coil 61 is long in the axial direction, even if the movable side coil 8 descends as shown in FIG. 12B, the movable side coil 8 comes out of the space surrounded by the fixed side coil 61. Absent.

  In the above-described embodiments, the fixed coil 7 and the moving coil 8 are not provided with a core, but may be provided with a core like a known transformer.

  In the embodiment described above, the coils are all one-turn coils, but coils having a plurality of turns may be used instead.

  In each of the above-described embodiments, the stationary coil is on the outside and the movable coil is provided on the inner side. On the contrary, the stationary coil is provided on the inner side, and the outer periphery is surrounded by the movable coil. May be. If the electromagnetic coupling is maintained, the fixed coil and the movable coil may be arranged in parallel.

1 is a schematic perspective view conceptually showing a cylinder block quenching apparatus according to an embodiment of the present invention. It is a front view of the induction heating coil employ | adopted with the hardening apparatus of the cylinder block of FIG. It is a front view of the modification of an induction heating coil. It is a cross-sectional perspective view which shows an example of the combination part of the stationary side coil and movable side coil of the hardening apparatus of the cylinder block of embodiment of this invention. FIG. 2 is a cutaway perspective view of an inner wall of an opening of a cylinder block quenched by the cylinder block quenching apparatus of FIG. 1. It is an expanded view of the inner wall of a cylinder block. It is a flowchart which shows operation | movement of the quenching apparatus of the cylinder block of FIG. The operation | movement of the quenching apparatus of the cylinder block of other embodiment of this invention is shown, (a) is sectional drawing of the cylinder block at the time of a quenching start, (b) is sectional drawing of the cylinder block in the middle of operation | movement. . The operation | movement of the quenching apparatus of the cylinder block of further another embodiment of this invention is shown, (a) is sectional drawing of the cylinder block at the time of a quenching start, (b) is sectional drawing of the cylinder block in the middle of operation | movement. is there. The operation | movement of the quenching apparatus of the cylinder block of further another embodiment of this invention is shown, (a) is sectional drawing of the cylinder block at the time of a quenching start, (b) is sectional drawing of the cylinder block in the middle of operation | movement. is there. It is a conceptual diagram of the quenching apparatus of the cylinder block of further another embodiment of this invention. It is explanatory drawing which shows operation | movement of the quenching apparatus of the cylinder block shown in FIG. 11, (a) shows the case where a movable side coil exists in the upper end vicinity, (b) shows the state which the movable side coil fell. Show.

DESCRIPTION OF SYMBOLS 1 Cylinder block hardening apparatus 2 Base 3 XY table 5 Lifting table 6 Transformer 7 Fixed side coil 8 Movable side coil 10 Induction heating coil 11 Motor (coil operation means)
21 Lifting device (Axial moving means)
60 Cylinder block hardening device 81 Nozzle (opening)

Claims (8)

  In a quenching device for a cylinder block that quenches the inner wall of the opening of the cylinder block, a stationary coil to which an alternating current is supplied and an induction current that is disposed in the vicinity of the stationary coil and is electromagnetically coupled to the stationary coil A movable side coil that generates an electromagnetic wave, an induction heating coil that can be inserted into the opening of the cylinder block, an induction heating coil that is moved in the axial direction relative to the cylinder block, and a fixed side coil that is a movable side coil An axial direction moving means for integrally moving in the axial direction; and a coil operating means for rotating the induction heating coil within the opening of the cylinder block. The induction heating coil is connected to the movable side coil. It is rotatable with respect to the stationary coil, and the movable coil can follow when the coil operating means rotates the induction heating coil. Quenching apparatus of that cylinder block.   The cylinder block hardening apparatus according to claim 1, wherein the fixed side coil has an annular portion, and the movable side coil is disposed in the annular portion of the fixed side coil.   In a quenching device for a cylinder block that quenches the inner wall of the opening of the cylinder block, a stationary coil to which an alternating current is supplied and an induction current that is disposed in the vicinity of the stationary coil and is electromagnetically coupled to the stationary coil Movable induction coil, induction heating coil that can be inserted into the opening of the cylinder block, axial movement means for moving the induction heating coil in the axial direction relative to the cylinder block, and the induction heating coil to the cylinder Coil operating means for rotating within the opening of the block, the induction heating coil is connected to the movable side coil, the movable side coil is rotatable with respect to the fixed side coil, and the coil operating means is connected to the induction heating coil. When rotating, the movable coil can follow, the fixed coil and the movable coil are both annular, and the fixed coil is movable coil. The fixed side coil is longer in the axial direction than the movable side coil, and the movable side coil is movable in the axial direction within the space surrounded by the fixed side coil. Block quenching equipment.   The cylinder block quenching apparatus according to any one of claims 1 to 3, further comprising a cooling device, wherein the portion heated by the induction heating coil is sequentially cooled by the cooling device.   5. The quenching apparatus for a cylinder block according to claim 4, wherein the cooling device includes an opening for injecting a coolant, and the opening moves in the axial direction together with the induction heating coil, and the heating portion can be sequentially cooled. .   The cylinder block quenching apparatus according to claim 4, wherein the cooling device is a tank containing a cooling liquid, and the liquid level of the cooling liquid is raised and lowered to sequentially cool the heated portion.   5. The quenching apparatus for a cylinder block according to claim 4, wherein the cooling device is a tank containing a coolant, and either the tank or the cylinder block can be moved up and down to sequentially cool the heated portion.   A cylinder block manufacturing method using the cylinder block quenching apparatus according to any one of claims 1 to 7, wherein the induction heating coil is rotated and moved in the axial direction.

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