JP5320951B2 - Thermal spray coating forming apparatus and thermal spray coating forming method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To evade the phenomenon that, when a block supporting stand rotates to either or the other edge part, the through-hole of the block supporting stand is located in the outside of the end part of the base stand and exposed to the outside, and to suppress the reduction of exhaust efficiency without using a large-sized exhausting device. <P>SOLUTION: When the cylinder bore 3a (3b) of the first (second) bank 7 (9) in a cylinder block 1 of a V type engine is thermally sprayed, the air in the cylinder bore 3a (3b) is exhausted to the outside by an exhausting device 37 through the block supporting stand communication hole 17c of a block supporting stand 17 rotatable together with the cylinder block 1 and the base stand communication hole 19b of the base stand 19. At this time, an open part 25 projecting from the base stand 19 of the block supporting stand communication hole 17c is shut by a slide shutter 27. The slide shutter 27 moves in accordance with the rotation of the block supporting stand 17. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a thermal spray coating forming apparatus and a thermal spray coating forming method for forming a thermal spray coating on an inner surface of a cylinder bore.

  For example, when a sprayed coating is formed on a cylinder bore of a cylinder block of a V-type engine having a plurality of cylinder rows in which cylinder bores are arranged in the axial direction of the crankshaft, for example, a method as described in Patent Document 1 below is used. It is taken.

In this thermal spraying method, a rotating part that serves as a block support for supporting a cylinder block is provided with a rotating support serving as a base so that the cylinder bore of one cylinder bore array that performs thermal spraying in a plurality of cylinder arrays has a central axis in the vertical direction. Spraying is performed by inserting a spray gun from above the cylinder bore in a state of being rotated and displaced with respect to the table. At this time, excess thermal spraying material is discharged to the outside by sucking and exhausting the air in the cylinder bore to be sprayed from the outside through the through holes formed in the rotating part and the rotating cradle.
JP 2007-182621 A

  By the way, in the conventional thermal spray coating forming apparatus described above, in order to increase the exhaust efficiency at the time of thermal spraying, if the through hole of the rotating part or the rotating cradle, especially the through hole of the rotating part is made larger, the rotating part is When rotating to the end on one side or the end on the other side, there is a concern that a part of the through hole of this rotating part is located outside the edge of the rotating cradle and opened to the outside and exposed. Is done.

  In such a case, the efficiency at the time of exhaust may not be as high as expected, and if it is attempted to increase the suction force at the time of exhaust to compensate for this, a large exhaust device is required and the cost increases. Will be invited.

  Therefore, the present invention avoids that the through hole of the block support base is located outside the edge of the base and is exposed to the outside when the block support base rotates to one or the other end. The purpose is to increase the efficiency without using a large exhaust system.

  The present invention provides a block support for supporting a cylinder block of an engine having at least two cylinder rows in which cylinder bores are arranged in the axial direction of the crankshaft, and a base for rotating and supporting the block support with the cylinder block around the crankshaft. Exhaust that sucks and exhausts the air in the cylinder bore that is sprayed by the spraying means through the base, the spraying means for supplying the spraying material to the cylinder bore, and the respective through holes formed in the base and the block support base And when the spray coating is formed on the inner surface of the cylinder bore in a state where the block support base is rotationally displaced to one side or the other side with respect to the base, The present invention is characterized in that a closing member is provided that closes an open portion that is located outside and opens.

  According to the present invention, in a state where the block support base is rotationally displaced to one side or the other side with respect to the base, the cylinder row on one end side or the other end side of the plurality of cylinder rows is arranged. When the spray coating is formed on the inner surface of the cylinder bore, the open portion where the through hole of the block support base is located outside the base is opened and closed by the closing member, so that the block support base for rotating and supporting the cylinder block Even if the through hole is made larger, it is possible to avoid the through hole of the block support base from being exposed to the outside when the block support base rotates to one or the other end, and to improve the exhaust efficiency.

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

  FIG. 1 is a cross-sectional view taken along line AA of FIG. 2, which is a front view of a thermal spray coating forming apparatus showing a first embodiment of the present invention. This thermal spray coating forming apparatus forms a thermal spray coating by discharging and supplying a thermal spray material from a thermal spray gun 5 as thermal spraying means to the cylinder bores 3a and 3b in the cylinder block 1 of the automotive V-type engine. In FIG. 2, the spray gun 5 and the members that support the spray gun 5 shown in FIG. 1 are omitted.

  As shown in FIG. 1, the cylinder block 1 of the V-type engine includes a first bank 7 and a second bank 9 that form a V-shape with each other. In the first bank 7, the cylinder bore 3a has one cylinder row in which a plurality of cylinder bores are arranged in a direction orthogonal to the paper surface in FIG. 1 (the axial direction of the crankshaft not shown), and in the second bank 9, the cylinder bore 3b has In FIG. 1, it has another cylinder row in which a plurality of cylinder bores are arranged in a direction orthogonal to the paper surface (axial direction of the crankshaft).

  That is, in the cylinder block 1, the axis lines SL and SR of the cylinder bores 3a and 3b intersect each other when viewed from the axial direction of the crankshaft.

  Here, the cylinder block 1 is integrated by attaching a crankcase 13 to a lower part of a skirt part 11 formed at the lower part, and a rotation support for rotating and supporting the crankshaft between the skirt part 11 and the crankcase 13. The bearing part 15 used as a part is provided. Note that the crankshaft described above is not assembled to the cylinder block 1 when the sprayed coating is formed.

  The cylinder block 1 described above is fixedly installed on a block support base 17 serving as a rotating portion via a fixture 18 with the crankcase 13 facing downward. The block support 17 has a flat upper surface portion 17a on which the crankcase 13 is fixed and a circular curved surface 17b that protrudes downward, and is disposed on a base 19 that serves as a rotation receiving base. The base 19 is provided with a concave circular curved surface 19 a corresponding to the convex circular curved surface 17 b of the block support base 17 in the upper part.

  The convex circular curved surface 17b and the concave circular curved surface 19a described above are formed in an arc shape centering on the rotation center axis X of the crankshaft at the bearing portion 15, and the block support base 17 is formed of the rotation center axis. 1, the cylinder block 1 on the block support 17 is also oscillated and rotated in the same manner as shown in FIG.

  As shown in FIG. 2, both left and right end portions of the block support base 17 protrude left and right with respect to the cylinder block 1, and a tilt shaft 21 is connected to the upper surface portion 17 a of the protruding portion. The tilt shaft 21 includes a vertical portion 21a extending upward from the upper surface portion 17a in FIG. 2 and a horizontal portion 21b extending in the horizontal direction so as to be separated from the cylinder block 1 from the upper end portion of the vertical portion 21a. . The central axis of the horizontal portion 21b coincides with the rotation center axis X described above.

  On the other hand, the base 19 is installed and fixed on the bottom surface portion 23a of the table 23, and the horizontal portion of the tilt shaft 21 is disposed on the upper portion of the side wall portion 23b extending upward from the left and right ends in FIG. The end part of 21b is connected so that rotation is possible.

  Then, one of the left and right tilt shafts 21 as described above is inserted into the rotation support hole 23c of the side wall portion 23b so as to be rotatable while the horizontal portion 21b of the left tilt shaft 21 in FIG. A motor M serving as a driving unit is connected to the protruding end. That is, by driving the motor M, the cylinder block 1 is swung and rotated together with the block support base 17 in the direction indicated by the arrow B in FIG.

  In addition, a control device C as a control means for driving and controlling the motor M is connected to the motor M.

  At this time, the cylinder block 1 is rotated clockwise in FIG. 1 by the control device C driving and controlling the motor M, so that the cylinder bore 3a of the first bank 7 moves upward in the vertical direction as shown in FIG. 1 and the cylinder bore 3b of the second bank 9 is displaced to the position opened upward in the vertical direction as shown in FIG. 4B.

  A base communication hole 19b as a through-hole penetrating in the vertical direction is formed at the center in the left-right direction in FIG. 1 of the base 19, and an upper opening 19c on the circular curved surface 19a side of the base communication hole 19b is The block support base 17 communicates with a block support base communication hole 17c as a through hole. Even if the cylinder block 1 is oscillated and displaced at the positions shown in FIGS. 4A and 4B, the block support base communication hole 17c has a part of the lower opening 17d of the base communication hole 19b. The lower side in FIG. 1 is greatly expanded so as to always communicate with the entire upper opening 19c.

  The horizontal width of the block support base communication hole 17c and the base communication hole 19b in FIG. 2 is formed to be shorter than the length of the cylinder block 1 in the same direction, and the left and right inner ends are both outer ends of the cylinder block 1. It is located inside the part.

  Here, in the present embodiment, as shown in FIG. 4A, the block support 17 is rotated and displaced to one end, or as shown in FIG. In a state in which it is rotationally displaced to the other end, an opening 25 is generated in which a part of the block support base communication hole 17 c is located outside the edge of the base 19 and is opened. A slide shutter 27 is provided as a closing member that closes the opening 25.

  The slide shutter 27 is movably disposed in a gap 29 between the circular curved surface 17b of the block support base 17 and the circular curved surface 19a of the base 19, and therefore has a circular curved surface similar to the circular curved surfaces 17b and 19a. I have. 3A is a cross-sectional view taken along the line DD of FIG. 1, and guide protrusions 19d are formed on the circular curved surface 19a on the circular curved surface 19a of the base 19 on both sides of the slide shutter 27 in the width direction (left and right direction in FIG. 2). The guide shutter 19d is guided and moved with the slide shutter 27 disposed between the pair of guide projections 19d.

  As shown in the enlarged view of FIG. 3B, the slide shutter 27 described above is provided with an inner protrusion as an engaging portion at an end protruding outside from a gap 29 between the block support base 17 and the base 19. 27a, and this inner protrusion 27a is locked on a notch 17e formed on the edge of the block support base 17.

  The slide shutter 27 has an outer protrusion 27 b that protrudes on the opposite side to the inner protrusion 27 a described above, and a tension coil spring 31 as an elastic member is interposed between the outer protrusion 27 b and the upper surface of the base 19. doing. That is, the tension coil spring 31 presses the inner protrusion 27a onto the notch 17e. In place of this tension coil spring 31, rubber may be used.

  Therefore, for example, as shown in FIG. 4A, when the block support base 17 is rotationally displaced to one end side and the other end side enters the base 19, the slide shutter on the other end side is provided. The locked state of the inner projection 27a of the 27 with respect to the notch 17e is released. At this time, the slide shutter 27 on the other end side is pulled by the tension coil spring 31 so that one side opposite to the side on which the inner projection 27a is provided enters the base 19, and the outer projection 27b is the base. It will be located near the upper surface of the table 19.

  Further, the end 27c on the side inserted into the gap 29 of the slide shutter 27 is in a state where the block support 17 shown in FIG. 4A is rotationally displaced to one end, or in FIG. 4B. In a state where the block support 17 shown in FIG. 4 is rotationally displaced to the other end, as shown by the left slide shutter 27 in FIG. 4A and the right slide shutter 27 in FIG. The slide shutter 27 is positioned and closes the opening 25.

  At this time, the slide shutter 27 on the right side in FIG. 4A and the slide shutter 27 on the left side in FIG. 4B are connected to the base 19 of the base 19 at the end 27 c on the side inserted into the gap 29. The slide shutter 27 does not block the base communication hole 19b because the position is away from the hole 19b.

  The lower opening 19e of the base communication hole 19b described above communicates with an exhaust passage 33 formed in the table 23. The exhaust passage 33 includes a communication portion 33a that directly communicates with the lower opening 19e of the base communication hole 19b, and an exhaust passage portion 33b that communicates with the lower end of the communication portion 33a and extends in the left-right direction in FIG. .

  The right end of the exhaust passage portion 33b in FIG. 1 opens to the outside, and the exhaust pipe 35 is connected to the external opening. The exhaust pipe 35 is connected with an exhaust device 37 as an exhaust means having a fan or the like, and when the sprayed coating is formed, the air in the cylinder bores 3a and 3b is sucked and exhausted (ventilated). The left end of the exhaust passage 33b in FIG. 1 is closed by a lid 39 that can be opened and closed.

  Further, a foreign object dropping plate 41 is installed in an inclined state on the right side in FIG. 1 in the communication portion 33a of the exhaust passage 33, and a foreign object receiving plate 43 is provided on the bottom surface in the exhaust passage portion 33b below the foreign material dropping plate 41. Place. The foreign material tray 43 can be taken out by opening the lid 39.

  Note that the table 23 described above is movable in the left-right direction in FIG. 2 along the guide rail 45.

  The spray gun 5 shown in FIG. 1 is rotatably supported with respect to a gun support 47 connected to the upper portion thereof, and the spray gun 5 is rotated by a rotation drive motor 49.

  At this time, a driven pulley 51 is provided on the outer periphery of the spray gun 5 in the vicinity of the gun support 47, while a drive pulley 53 is connected to the rotary drive motor 49, and these pulleys 51, 53 are connected to each other by a connecting belt 55. . That is, the spray gun 5 is rotated with respect to the gun support 47 by the rotation drive motor 49.

  The gun support 47 is provided with a lifting device 57 that moves the gun support 47 in the vertical direction in FIG. 1 together with the spray gun 5 and the rotation drive motor 49. The lifting device 57 can be constituted by, for example, a pinion and a rack. Further, the tip of a connecting arm 59 extending in the horizontal direction is connected to the elevating device 57, and the base end of the connecting arm 59 is on the upper side of the support post 61 extending in the vertical direction on the side of the table 23 in FIG. It is attached.

  The rotary drive motor 49 that rotates the thermal spray gun 5 and the gun support 47 are connected and fixed by a fixture (not shown), and these move together in the vertical direction in FIG. In addition, the control device C shown in FIG. 1 operates and controls the rotational drive motor 49 and the lifting device 57 as well.

  Next, the operation will be described. As shown in FIGS. 1 and 2, the cylinder block 1 is installed on the upper surface portion 17 a in a state where the upper surface portion 17 a of the block support base 17 is horizontal, and is fixed by a fixture 18. From this state, the control device C drives and controls the motor M to rotate the tilt shaft 21 clockwise around the horizontal portion 21b in FIG. As a result, the block support base 17 is a cylinder whose convex circular curved surface 17b rotates along the concave circular curved surface 19a of the base 19 and rotates together with the block support base 17 as shown in FIG. The block 1 is in a state where the cylinder bore 3a of the first bank 7 is opened upward in the vertical direction.

  At this time, the slide shutter 27 on the right side in FIG. 4A enters the inside of the base 19 while being pulled by the tension coil spring 31 as the block support 17 rotates, and the outer protrusion 27b is shown in FIG. As shown in a), when it is positioned in the vicinity of the upper surface of the base 19, the locked state of the inner protrusion 27a with respect to the notch 17e is released.

  On the other hand, in FIG. 4A, the left slide shutter 27 moves integrally with the block support 17 while extending the tension coil spring 31 because the inner protrusion 27a is locked to the notch 17e. . At this time, a part of the block support base communication hole 17c is formed with an opening 25 that is located outside the base 19 away from the circular curved surface 19a of the base 19, and the opening 25 is formed by the slide shutter 27. It becomes the state obstructed by.

  Further, the entire base communication hole 19b of the base communicates with a part of the lower opening 17d of the block support base communication hole 17c.

  In the state shown in FIG. 4 (a), the spray gun 5 is located at the upper position in the vertical direction of the cylinder bore 3a. At this time, the rotation center of the spray gun 5 and the axis SL of the cylinder bore 3a coincide with each other. From the state shown in FIG. 4A, the spray gun 5 is lowered by driving the lifting device 57 while being rotated by driving the rotation drive motor 49, and enters the cylinder bore 3a of the first bank 7, and its nozzle portion. By spraying the spraying material from 5a, a sprayed coating is formed on the inner surface of the cylinder bore 3a.

  When sequentially forming a spray coating on a plurality (three in this case) of the cylinder bores 3a in the first bank 7, the spray gun 5 is pulled out from the cylinder bore 3a after the spray coating is formed, and the position shown in FIG. In this state, the table 23 is moved together with the cylinder block 1 in a direction perpendicular to the paper surface in FIG. 4A, and the spray gun 5 is set to a position above the cylinder bore 3a for the unsprayed portion. .

  When the thermal spraying operation for a plurality of (three in this case) cylinder bores 3a in the first bank 7 is completed, the motor is controlled by the control device C shown in FIG. 1 while the thermal spray gun 5 is raised to the position shown in FIG. M is driven to rotate the tilt shaft 21 counterclockwise in FIG. 4A around the horizontal portion 21b. The rotation angle at this time corresponds to the intersection angle α between the axis lines SL and SR of the cylinder bores 3a and 3b shown in FIG.

  As a result, the block support base 17 is rotated by the convex circular curved surface 17b along the concave circular curved surface 19a of the base 19, and rotates with the block support base 17 as shown in FIG. The block 1 is in a state where the cylinder bore 3b of the second bank 9 is opened upward in the vertical direction.

  In the state shown in FIG. 4B, the spray gun 5 is at a position vertically above the cylinder bore 3b. At this time, the rotational center of the spray gun 5 and the axis SR of the cylinder bore 3b coincide with each other.

  From the state shown in FIG. 4B, the spray gun 5 is lowered while rotating in the same manner as described above to enter the cylinder bore 3b of the second bank 9, and the spray material is discharged from the nozzle portion 5a. Thus, a sprayed coating is formed on the inner surface of the cylinder bore 3b.

  As described above, the cylinder block 1 is rotated by the crossing angle α between the axes SL and SR of the cylinder bores 3a and 3b around the bearing portion 15 which is the rotation center portion of the crankshaft. The cylinder bores 3a and 3b of both banks 7 and 9 of the cylinder block 1 can be moved in the vertical direction (vertical direction) in FIG. 2 corresponding to a certain direction without changing the mounting position, that is, without changing the setup. With the same spray gun 5, it is possible to discharge the spray material and form a spray coating.

  In this way, when the sprayed coating is formed on the cylinder bores 3a and 3b, the exhaust device 37 is operated, and air in the cylinder bores 3a and 3b is sucked from the exhaust pipe 35 for ventilation. Ventilation air enters the cylinder bores 3a and 3b from the upper outside and passes through the exhaust passage 33 in the table 23 to the exhaust pipe 35 through the block support base communication hole 17c and the base communication hole 19b.

  At this time, a part of the spraying material discharged from the nozzle portion 5a is scattered without adhering to the cylinder bores 3a and 3b, but the scattered spraying material is moved downward by the above-described ventilation air and drops foreign matter. It falls on the foreign material receiving tray 43 by contacting the plate 41 or the like. The foreign matter such as the thermal spray material dropped on the foreign material receiving tray 43 opens the lid 39, takes out the foreign material tray 43, and appropriately disposes it as waste.

  In this embodiment, as shown in FIG. 4, the block support base communication hole 17c is formed large so that the entire base communication hole 33a is communicated with the block support base communication hole 17c to increase the exhaust efficiency. ing. At this time, an open portion 25 is generated in which the left portion of the block support base communication hole 17c in FIG. 4A opens to the outside. Since the open portion 25 is covered by the slide shutter 27, the exhaust portion 25 is exhausted. Exhaust (suction) efficiency can be increased without increasing the size of the apparatus.

  Further, in the present embodiment, the slide shutter 27 moves so as to block the opening 25 where the block support base communication hole 17 c is located outside the base 19 and is opened with the rotational displacement of the block support base 17. It is supposed to be. For this reason, a dedicated drive device for moving the slide shutter 27 is unnecessary, and it is possible to achieve a reduction in equipment cost and simplification of maintenance and management.

  At this time, in this embodiment, the slide shutter 27 is provided on the slide shutter 27 with a simple structure in which an inner protrusion 27 a that is engaged with the notch 17 e that is an edge of the block support base 17 is provided. Along with the rotational displacement, the opening 25 can be rotated to a position where it is closed.

  In addition, when the block support base 17 rotates in the opposite direction from the state where the slide shutter 27 closes the opening portion 25, the tension coil spring 31 can enter the gap 29 so as to pull the slide shutter 27. Therefore, also in this case, the slide shutter 27 can enter the gap 29 with a simple structure in which the tension coil spring 31 is simply provided.

  FIG. 5 is a cross-sectional view corresponding to FIG. 1 of the thermal spray coating forming apparatus according to the second embodiment of the present invention, and FIG. 6 is an operation explanatory view corresponding to FIG. In the second embodiment, a bellows 63 is used instead of the slide shutter 27 used in the first embodiment shown in FIG.

  Further, the base 19 in this embodiment has a lower vertical height than the base 19 in the first embodiment shown in FIG. 1, and the block support 17 is horizontal as shown in FIG. In the state, the left and right ends 17 c 1 of the block support base communication hole 17 c are not closed by the base 19. The left and right end portions 17c1 of the block support base communication hole 17c are closed by the bellows 63 described above.

  The bellows 63 has an upper end 63 a attached to the upper bellows attachment protrusion 65 at the upper edge of the block support base 17 and a lower end 63 b attached to the base 19 near the block support base 17. That is, the bellows 63 is arranged along the convex circular curved surface 17b of the block support base 17 so as to cover the block support base communication hole 17c.

  Also in this embodiment, when the sprayed coating is formed on the cylinder bore 3a of the first bank 7 or the cylinder bore 3b of the second bank 9 from the state of FIG. It rotates about the part 21b, and it will be in the state of Fig.6 (a) or FIG.6 (b).

  6 (a) or 6 (b), one end portion 17c1 of the block support base communication hole 17c of the block support base 17 enters the base 19 and is closed by the circular curved surface 19a. However, the end 17c1 on the other side protrudes (exposes) more greatly from the base 19 to form the open portion 25.

At this time, in this embodiment, the bellows 63 on the side forming the opening 25 extends as shown on the left side of FIG. 6A and the right side of FIG. The open portion 25 of the communication hole 17c is covered and closed. The bellows 63 corresponding to the side closed by the base 19 of the block support base communication hole 17c is in a contracted state as shown on the right side in FIG. 6 (a) and on the left side in FIG. 6 (b).
Here, also in the present embodiment, as in the first embodiment, when the sprayed coating is formed as shown in FIG. 6, the exhaust device 37 is operated, and at this time, the block support base communication hole 17c is formed large. Exhaust efficiency is enhanced by connecting the entire base communication hole 19b to the block support base communication hole 17c. At this time, the left part of the block support base communication hole 17c in FIG. 6A or the right part in FIG. Since the open portion 25 is covered with the bellows 63, the exhaust (suction) efficiency can be increased without increasing the size of the exhaust device.

  Further, in the second embodiment, the bellows 63 connects the edge of the block support base 17 and the base 19 to each other so that they can be expanded and contracted, and follows the rotational displacement of the block support base 17. . As a result, the bellows 63, which is a closing member, has a simple structure in which the bellows 63 is simply provided. As the block support base 17 rotates, the block support base communication hole 17c is positioned outside the base 19 and is opened. It moves by expansion and contraction so as to block the opening portion 25 to be closed.

  In place of the bellows 63 in the second embodiment described above, rubber may be used, a telescopic cover for protecting the sliding surface and the movable part in the machine tool from chips and cutting agents, and a roll curtain. A roll-up type cover such as (roll screen) may be used. In short, when the thermal spray coating is formed, a closing member that closes the opening portion 25 of the block support base communication hole 17c that is located outside the base 19 and is exposed to the outside from the base 19 may be used.

It is AA sectional drawing of FIG. 1 is a front view of a thermal spray coating forming apparatus showing a first embodiment of the present invention. (A) is DD sectional drawing of FIG. 1, (b) is the expanded sectional view of the principal part of FIG. (A) is operation | movement explanatory drawing which shows the state which forms a sprayed coating with respect to the cylinder bore of a 1st bank, (b) is operation | movement explanatory drawing which shows the state which forms a sprayed coating with respect to the cylinder bore of a 2nd bank. is there. It is sectional drawing equivalent to FIG. 1 of the thermal spray coating formation apparatus concerning the 2nd Embodiment of this invention. It is operation | movement explanatory drawing corresponding to FIG. 4 of 2nd Embodiment.

Explanation of symbols

1 Cylinder block 3a, 3b Cylinder bore 5 Spray gun (spraying means)
17 Block support base 17c Block support base communication hole (through hole)
17b Convex circular curved surface of block support base 17e Notch (edge) of block support base
19 base 19a concave circular curved surface of base 19b base communication hole (through hole)
25 Opening portion 27 Slide shutter (closing member)
27a Inner protrusion (locking part)
29 Clearance 31 Tension coil spring (elastic member)
37 Exhaust device (exhaust means)
63 Bellows (occlusion member)

Claims (6)

  In the spray coating apparatus for supplying a thermal spray material to an engine cylinder block having at least two cylinder rows in which cylinder bores are arranged in the axial direction of the crankshaft to form a spray coating on the inner surface of the cylinder bore, the cylinder block A block support for supporting the block, a base for rotating the block support together with the cylinder block about the crankshaft, and the thermal spray material positioned on the opposite side of the block to the cylinder bore. Spraying means to be supplied, located on the side opposite to the block support base with respect to the base, through the respective through holes formed in the base and the block support base, and in the cylinder bore for performing thermal spraying by the spraying means An exhaust means for sucking and exhausting air, A thermal spray coating is formed on the cylinder bore inner surface of the cylinder row on one end side or the other end side in the arrangement direction of the plurality of cylinder rows in a state of being rotationally displaced to one side or the other side with respect to the base. In this case, the thermal spray coating forming apparatus is provided with a closing member that closes an open portion where the through hole of the block support base is located outside the base and opens.   The said closing member moves so as to block the open part where the through hole of the block support base is located outside the base and opens with the rotational displacement of the block support base. 2. The thermal spray coating apparatus according to 1.   The block support base has a convex circular curved surface facing the base, and the base includes a concave circular curved surface corresponding to the convex circular curved surface of the block support base, and each circular curved surface Is a curved shape centering on the rotation center of the block support base, and the closing member is movably inserted on one side into a gap formed between the circular curved surfaces, and on the other side the block An engaging portion that can be engaged and disengaged with respect to the edge of the support base is provided, and the engaging portion is configured such that the block support base is opened with its through hole positioned outside the base. The thermal spray coating apparatus according to claim 2, wherein when rotating, the edge of the block support base is locked and moved together with the block support base.   When the block support base rotates between the vicinity of the locking portion of the closing member and the base and rotates in the opposite direction from a state in which the through hole is located outside the base and is open, The thermal spray coating forming apparatus according to claim 3, further comprising an elastic member that moves the member so as to enter the gap.   The said blocking member connects the edge part of the said block support stand, and the said base, mutually enables it to expand-contract between these, The said block support stand follows the rotational displacement of the said block support stand. Thermal spray coating device.   In the thermal spray coating forming method, the thermal spray coating is formed on the inner surface of the cylinder bore by supplying a thermal spray material to an engine cylinder block having at least two cylinder rows in which cylinder bores are arranged in the axial direction of the crankshaft. In the state where the block support for supporting the base is rotated and displaced to one side or the other side around the crankshaft together with the cylinder block with respect to the base, one end side or the other side in the arrangement direction of the plurality of cylinder rows When the thermal spray material is sprayed from the opposite side of the block support to the cylinder bore on the inner surface of the cylinder bore of the cylinder row on the end side of the base, from the opposite side of the block support to the base The thermal spraying is performed through the through holes formed in the base and the block support base. When the air in the cylinder bore is sucked and spraying is performed while sucking the air, the opening portion where the through hole of the block support base is located outside the base is opened and closed by a closing member. Thermal spray coating forming method.

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