JP2002317641A - Turbine housing inner wall spray method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a turbine housing inner wall spray method for spraying an abrasion resistant material on an inner wall of a turbine housing capable of producing the turbine housing having sufficient abrasion resistance. SOLUTION: An articulated robot grasping a spray device is prepared in stead of a conventional turbine housing inner wall spray method for spraying the abrasion resistant material on an inner wall of a scroll passage of the turbine housing. This method comprises a rotation process for rotating the turbine housing around an axis, and an injection process for injecting the abrasion resistant material while accommodating a tip of an injection cylinder of the spray device inside of the turbine housing and varying attitude of the injection cylinder in accordance with attitude data instructed to the articulated robot in advance so as to spray the abrasion resistant material onto the inner wall of the scroll passage. The spray process and the rotation process are interlocked.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a method for spraying the inner wall of a turbine housing. In particular, the present invention relates to a method for spraying the inner wall of a turbine housing which is characterized by a spraying procedure.

[0002]

2. Description of the Related Art A supercharger is used to increase the output and efficiency of an internal combustion engine. Especially the twin flow type turbocharger
Applied to multi-cylinder large-displacement engines such as for ships. The twin-flow type turbocharger has a turbine section that sucks high-pressure gas in the axial center direction from the outer peripheral tangent direction and blows out one side in the axial direction (hereinafter, referred to as a discharge side). A casing main body and a turbine rotor are provided.

As shown in FIGS. 5 and 6, a casing main body 2 is provided with a space (hereinafter, referred to as a turbine interior space) in which a turbine rotor 3 is rotatably mounted around an axis. This is a container having an inner wall that forms a plurality of scroll flow paths 1a and 1b that are provided in a spiral shape and that reach the turbine interior space, and constitute the appearance of the turbocharger turbine section. The plurality of scroll channels 1a and 1b
They are separated by a flow path wall 8 and overlap in the axial direction. The flow path wall 8 protrudes from the inner wall of the scroll flow path 1 in the radial direction of the turbine rotor 3, and cuts the minimum flow path of the scroll flow path 1 from the gas supply port 4 along the inner wall forming the scroll flow paths 1 a and 1 b. It extends to the area edge. For convenience of explanation, the scroll flow path on the gas discharge side is called a front scroll flow path 1a, and the scroll flow path on the opposite side is called a rear scroll flow path 1b. The cross-sectional area of each scroll flow path 1 decreases from the tangential direction of the outer periphery toward the center axis, and becomes minimum at a position reaching the turbine interior space. The turbine rotor 3 is a turbine that rotates around the central axis of the casing main body 2 and is arranged in a turbine interior space so as to be rotatable around the axis.

The casing body 2 has a gas supply port 4 and a gas discharge port 5. The gas supply port 4 is a flow path that extends in a direction tangent to the outer circumference of the casing body and communicates with the scroll flow path, and has a flange portion having a flange surface orthogonal to the outer circumference tangent. The gas discharge port 5 is a flow path extending in the axial direction from the discharge side and communicating with the turbine interior space of the casing main body 2 and has a flange portion having a flange surface orthogonal to the axis.

[0005] The turbine rotor 3 has a turbine impeller and a shaft 7. The shaft is the casing body 2
The shaft 7 is rotatably penetrated through a heat shield plate 6 fitted on the side opposite to the discharge side, and a turbine impeller (not shown) is attached to a tip portion of the shaft 7.

Next, the operation of the supercharger will be described. When a multi-cylinder engine (not shown) operates, a plurality of gases (exhausts) discharged from a plurality of cylinders of the multi-cylinder engine are collected into two groups, and one group of gases is divided by the flow path wall 8. The remaining one group of gases is introduced into the rear scroll passage 1b.

[0007] Undesired exhaust interference between the gases discharged from the two sets of cylinders separately introduced into the front scroll flow path 1a and the rear scroll flow path 1b is suppressed, and the discharge is performed from each individual cylinder. Since the pulsation of the gas introduced into one scroll channel is averaged,
The dynamic pressure of the gas discharged from each cylinder is effectively converted to the rotation of the compressor.

In the twin-flow supercharger, as the scroll flow path 1 approaches the central axis, the cross-sectional area of the flow path gradually decreases, and the gas flow velocity increases accordingly. Fine particles such as silicon dioxide and aluminum oxide are contained in the gas. These fine particles may collide with the inner wall of the scroll flow path 1 due to centrifugal force and scrape the inner wall to cause erosion. In particular, the tendency becomes stronger near the center axis of the scroll flow path.

The occurrence of such erosion is a phenomenon that appears particularly remarkably in a twin-flow type turbocharger. In the single-flow supercharger, since the flow path wall 8 is not provided in the scroll flow path 1, erosion rarely occurs.

Conventionally, in order to cope with this erosion, cermet has been sprayed on the inner wall of the scroll flow path. Hereinafter, a conventional cermet spraying method will be described with reference to the drawings. FIG. 7 is a work procedure diagram of the cermet spraying operation. The emission port 39 of the emission cylinder nozzle 38 of the thermal spraying device 30 is brought close to the vicinity of the flange of the gas discharge port 5 of the casing main body 2, and the cermet is directed toward an inner wall (hereinafter, referred to as a scroll inner wall 9) forming the scroll flow paths 1 a and 1 b. Is sprayed, and the spraying position is moved from the outer peripheral tangent portion of the scroll flow path toward the center axis. The exit tube used at this time is a cermet that is jetted in the longitudinal direction and is called an outer diameter gun. The coating layer 10 of cermet is formed on the inner wall 9 of the scroll, so that the wear resistance of the casing body 2 can be improved.

[0011]

In the above-mentioned method of spraying a wear-resistant material on the inner wall of the turbine housing, it is difficult to see through the inner wall 9 of the scroll from the flange opening of the gas discharge port 5. Therefore, it has been difficult to sufficiently spray the cermet on all the regions of the scroll inner wall 9 where the wear resistance is to be improved.
Further, in the twin-flow type supercharger, the flow path wall 8 becomes a barrier when seeing the scroll inner wall 9 from the tip of the emission tube nozzle 38 of the thermal spraying device, and all the wear-resistant characteristics of the scroll inner wall 9 that are desired to be improved. The cermet could not be sprayed sufficiently to the area. Further, the emission port 39 of the emission cylinder nozzle 38 of the thermal spraying device 20 and the scroll inner wall 9 to be sprayed are provided.
Is not constant, and the movement of the injection cylinder nozzle 38 of the thermal spraying apparatus is hindered by the discharge port 5, so that it is difficult to make the thickness of the coating layer 10 a desired value. Therefore, there is a problem that it is difficult to produce a turbine housing having sufficient wear resistance.

The present invention has been devised in view of the above-described problems. Instead of the conventional method of spraying a wear-resistant material on the inner wall of a turbine housing, a sufficient method of spraying the inner wall of the turbine housing has been proposed. An object of the present invention is to provide a method for spraying the inner wall of a turbine housing, which can manufacture the secured turbine housing.

[0013]

In order to achieve the above object, a method of spraying a wear-resistant material on the inner wall of a scroll flow path of a turbine housing according to the present invention comprises a multi-joint holding a thermal spraying device. A robot is prepared, a rotation process of rotating the turbine housing around the axis, and a multi-joint robot in advance so that the tip of the emission tube of the spraying device is placed inside the turbine housing, and the wear-resistant material is sprayed on the inner wall of the scroll passage. And an injection step of injecting the wear-resistant material while changing the attitude of the injection cylinder in accordance with the attitude data taught in the above, and the injection step and the rotation step are linked.

According to the configuration of the present invention, the turbine housing is rotated about the axis in the rotation step, the tip of the emission tube of the thermal spraying device is inserted inside the turbine housing in the injection step, and a wear-resistant material is coated on the inner wall of the scroll flow path. The wear-resistant material is injected while changing the position of the injection cylinder in accordance with the position data taught to the articulated robot in advance so as to perform thermal spraying, and the injection process and the rotation process are linked, so that it is linked to the turbine housing that rotates about the axis. Then, the wear-resistant material is sprayed while changing the posture of the articulated robot holding the spraying device in accordance with the posture data taught in advance, and the wear-resistant material is sprayed on the inner wall of the scroll passage of the turbine housing, and the scroll flow is performed. The coating layer of the wear-resistant material can be securely adhered to the inner wall of the road.

Further, in the method for spraying the inner wall of the turbine housing according to the present invention, the injection step and the rotation step are linked so that the injection direction of the wear-resistant material as viewed from the axial direction becomes substantially constant. With the configuration of the present invention, the injection step and the rotation step are linked, and the direction of injection of the wear-resistant material as viewed from the axial direction becomes substantially constant, so that the injection pattern of the wear-resistant material can be easily managed, and the turbine can be easily controlled. A coating layer of a dimensionally stable wear-resistant material can be reliably adhered to the inner wall of the scroll passage of the housing.

Further, in the method for spraying the inner wall of the turbine housing according to the present invention, the rotating step changes the rotation speed at which the turbine housing is rotated according to the rotation position. According to the configuration of the present invention, in the rotation step,
Since the rotation speed for rotating the turbine housing is changed according to the rotation position, the thickness of the coating layer of the wear-resistant material on the inner wall of the scroll passage of the turbine housing can be easily controlled.

Further, in the method for spraying the inner wall of the turbine housing according to the present invention, the turbine housing has a plurality of scroll flow paths, and the injection step and the rotation step are performed for each scroll flow path. With the configuration of the present invention,
Since the injection step and the rotation step are performed on the plurality of scroll passages of the turbine housing for each scroll, the coating layer of the wear-resistant material can be securely adhered to the inner walls of the plurality of scroll passages of the turbine housing.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings. In each of the drawings, common portions are denoted by the same reference numerals, and redundant description will be omitted.

A method for spraying a wear-resistant material on an inner wall of a turbine housing according to an embodiment of the present invention will be described. FIG. 1 is a work procedure diagram viewed from the side of an embodiment of the present invention. FIG. 2 is a work procedure diagram viewed from the front of the embodiment of the present invention. FIG. 3 is an overall view of the embodiment of the present invention. The work procedure is divided into a teaching procedure and a production procedure. The teaching procedure is a procedure for teaching the attitude and position of the end effector to the articulated robot, and the production procedure is a procedure for actually spraying the casing.

First, the teaching procedure will be described. First, in FIG. 3, the thermal spraying apparatus 20, the articulated robot 40, and the turntable 50 are used.
And prepare. In FIG. 1 and FIG. 2, the exit cylinder nozzle 28 of the thermal spraying apparatus 20 has an exit port 29 so that the cermet exits at right angles from the axis of the exit cylinder nozzle. Such an emission cylinder nozzle 28 is called an inner diameter gun. (1) The end effector 41 of the articulated robot 40 grips the thermal spraying device 20. (2) The turntable 5 is rotatable about the casing body 2 as an axis.
Fix to 0. The scroll channel 1
The start of a and 1b is 0 degree, and the scroll flow paths 1a and 1b
The number of angles is set along the gas inflow direction (hereinafter referred to as the gas inflow direction) so that the end of b becomes 360 degrees. (Hereinafter, this angle is referred to as a casing angle.) (3) The attitude of the emission port 29 of the emission cylinder nozzle 28 of the thermal spraying device 20 is controlled so as to be substantially at the center of the turbine interior space of the casing body 2. (4) The output port 29 is directed to a position corresponding to the casing angle of 0 degree on the scroll inner wall 9 forming the front scroll flow path 1a, and the posture and position are taught. At this time, since the inner diameter gun is used, the thermal spraying device 20 does not interfere with the casing main body 2, and it is possible to select and teach an optimal posture and position. (5) Next, the casing body 2 is rotated in the anti-gas inflow direction by N degrees (for example, 45 degrees). The output port 29 is directed to a position corresponding to a casing angle of 45 degrees of the scroll inner wall 9 forming the front scroll flow path 1a, and the posture and position are taught. At this time, since the casing body is rotated in advance, it is not necessary to rotate the spraying port around the axis, and the amount of change in the posture is small, so that the optimum posture and position can be easily selected. (6) Hereinafter, the casing main body 2 is rotated by N degrees, and each time, the output port 29 is directed to the scroll inner wall 9 forming the front scroll flow path 1a, and the posture and position are taught. (7) The casing body is rotated 360 degrees to end the teaching. (8) The teaching steps from (3) to (7) are also performed for the rear scroll flow path. By performing this operation, data necessary for operating the articulated robot can be taught.

Next, the actual procedure will be described. (1) The moving speed of the point-to-point control of the articulated robot 40 is set. (2) Set the rotation speed of the turntable 50. The time required for the turntable 50 to rotate 360 degrees is equal to the time required for the articulated robot 40 to trace all the taught postures and positions. The value of the rotation speed is a constant value. (3) Set the attitude and position of the articulated robot 40 to the initial values taught. Therefore, the output cylinder nozzle 28 of the thermal spraying device 20
Exit 29 is located substantially in the center of the turbine interior space of the casing body 2, and the exit 29 is located in the front scroll passage 1.
The scroll inner wall 9 forming a is directed to a position corresponding to a casing angle of 0 degrees. (4) The rotation of the turntable 50 and the trajectory tracing work of the articulated robot 40 are started simultaneously. The casing body 2 on the turntable 50 rotates, and in conjunction therewith, the outlet 29 faces the scroll inner wall 9 to be sprayed, and the cermet is sprayed from the outlet 29, so that a cermet coating layer is formed on the scroll inner wall 9. You. (5) The teaching steps from (3) to (4) are also performed for the rear scroll flow path 1b. With this operation, a film of a wear-resistant material can be automatically formed on the scroll inner wall 9 that forms the front scroll passage 1a and the rear scroll passage 1b of the casing body.

The thickness of the coating layer 10 of the abrasion-resistant material adhered to the scroll flow path 9 is determined by the moving speed, the rotation speed, and the injection speed of the thermal spraying device. Therefore, it is preferable to perform a preliminary operation in which the moving speed, the rotation speed, and the injection speed of the thermal spraying device are changed before the actual operation, and obtain an appropriate moving speed, the rotational speed, and the injection speed of the thermal spraying device.

Hereinafter, an example of the thermal spraying apparatus 20 used in this operation will be described. FIG. 4 is a side view of the thermal spraying apparatus. The thermal spraying apparatus has an apparatus main body 21 having a combustion chamber provided therein at the lower part, and an emission tube 22.

The fuel (hydrogen, hydrocarbon) supplied from the fuel supply port 23 is supplied to the combustion chamber in a high pressure state together with the oxygen supplied from the oxygen supply port 24 and completely combusted, and the combustion gas generated by the complete combustion is produced. Is emitted as a hypersonic jet stream through the emission tube 22 from the emission port 29 of the emission nozzle 28.

On the other hand, the thermal spray material in the powder state is
1 is introduced into the center of the combustion gas by an inert gas from a powder supply port 25 provided at a rear portion of the combustion gas, and is injected as particles that are heated to a high temperature and move at high speed and follow the flow of the combustion gas. By welding to the target portion, a coating layer 10 as shown in FIGS. 1 and 2 is formed. 26
Denotes a cooling water inlet, and 27 denotes a cooling water outlet.

By using the method of spraying the wear-resistant material on the inner wall of the turbine housing of the above-described embodiment, the operation of spraying the wear-resistant material on the inner wall of the turbine housing using the articulated robot can be performed. Can be done automatically. That is, when the spraying operation of the wear-resistant material is automated by a robot, all functions required for a so-called painting operation robot are required to make the thickness of the coating film uniform.
However, if the spraying method according to the present invention is used, a combination of a simple and inexpensive articulated robot operated by point-to-point control and a simple turntable has a coating film equivalent to a coating film performed by an expensive painting robot. A turbine housing can be manufactured. Also,
Since the direction (upward in the figure) of the flow of the cermet discharged from the output port 29 as viewed from the axial direction is constant, the thickness and width of the sprayed coating layer can be made uniform. In addition, the thickness of the coating layer can be easily selected by selecting the moving speed, the rotating speed, and the injection speed of the thermal spraying device. Further, since cermet can be used as a wear-resistant material, a coating layer having high wear resistance can be applied to the casing body.

The present invention is not limited to the embodiments described above, and various changes can be made without departing from the gist of the invention. Although an example in which the turntable is rotated at a constant rotation speed has been described, the invention is not limited to this. For example, the rotation speed may be changed as needed for each rotation angle. Further, the amount of change in the casing angle of the turntable during teaching is set to a constant N.
The degree is not limited to this, but is not limited thereto. For example, the degree may be changed for each rotation angle. The inner wall portion where the coating thickness is desired to be thicker than the other inner walls is set to a smaller N degree, and even fine teaching may be performed. Although the articulated robot is illustrated as having six degrees of freedom in the space, it is not limited to this.
For example, three degrees of freedom is sufficient.

[0028]

As described above, the method for spraying the inner wall of the turbine housing of the present invention, which sprays the wear-resistant material on the inner wall of the turbine housing, has the following effects depending on the configuration. In conjunction with the turbine housing rotating around the axis, the wear-resistant material is sprayed while changing the posture of the articulated robot holding the spraying device in accordance with the posture data taught in advance, and is sprayed on the inner wall of the scroll passage of the turbine housing. By spraying the wear-resistant material, the coating layer of the wear-resistant material can be securely adhered to the inner wall of the scroll flow path. In addition, since the injection process and the rotation process are linked, the injection direction of the wear-resistant material as viewed from the axial direction can be substantially constant, so that the injection pattern of the wear-resistant material can be easily managed, and the turbine housing can be easily controlled. A coating layer of a wear-resistant material having stable dimensions can be reliably adhered to the inner wall of the scroll flow path. In addition, in the rotation step, the rotation speed at which the turbine housing is rotated is changed according to the rotation position, so that the thickness of the coating layer of the wear-resistant material on the inner wall of the scroll passage of the turbine housing can be easily controlled. Further, since the injection step and the rotation step are performed for each of the plurality of scroll passages of the turbine housing for each scroll, it is possible to reliably adhere the coating layer of the wear-resistant material to the inner walls of the plurality of scroll passages of the turbine housing. it can. Therefore, it is possible to provide a spraying method of the inner wall of the turbine housing for spraying the wear-resistant material on the inner wall of the turbine housing, which can manufacture a turbine housing having sufficient wear resistance.

[0029]

[Brief description of the drawings]

FIG. 1 is a work procedure diagram viewed from the side of an embodiment of the present invention.

FIG. 2 is a work procedure diagram viewed from the front of the embodiment of the present invention.

FIG. 3 is an overall view of an embodiment of the present invention.

FIG. 4 is an overall view of a thermal spraying apparatus.

FIG. 5 is a side sectional view of a turbine section of the supercharger.

FIG. 6 is a front sectional view of a turbine section of the supercharger.

FIG. 7 is a work procedure diagram viewed from the side of a conventional method.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 scroll flow path 1a front scroll flow path 1b rear scroll flow path 2 casing body 3 turbine rotor 4 gas supply port 5 gas discharge port 6 heat shield plate 7 shaft 8 flow path wall 9 scroll inner wall 10 coating layer 20 thermal spray device 21 Apparatus body 22 Outgoing cylinder 23 Fuel supply port 24 Oxygen supply port 25 Powder supply port 26 Cooling water inlet 27 Cooling water outlet 28 Outgoing cylinder nozzle (inner gun) 29 Outgoing port 30 Thermal spray device 38 Outgoing cylinder nozzle (outer gun) 39 Outgoing Mouth 40 Articulated robot 41 End effector 50 Turntable

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) B05D 7/22 B05D 7/22 Z C23C 4/12 C23C 4/12 F01D 25/24 F01D 25/24 Q F Terms (reference) 3G005 EA04 EA16 FA14 GB86 KA00 KA07 4D075 AA01 AA37 AA43 CA02 CA47 DA23 DB01 DC08 DC11 DC15 EA02 EB01 EB05 4K031 AA02 AA08 AB02 AB08 CB14 CB21 CB41 DA01 EA01 EA02

Claims (4)

[Claims] 1. A method for spraying a wear-resistant material on an inner wall of a scroll flow path of a turbine housing, the method comprising spraying a wear-resistant material onto an inner wall of a turbine housing. Rotating step and putting the tip of the emission cylinder of the spraying device inside the turbine housing, and changing the attitude of the injection cylinder according to the attitude data previously taught to the articulated robot so as to spray the wear-resistant material on the inner wall of the scroll flow path. A spraying step of spraying a wear-resistant material, wherein the spraying step and the rotating step are linked to each other, wherein the spraying method for the inner wall of the turbine housing is performed. 2. The method of spraying the inner wall of a turbine housing according to claim 1, wherein the injection step and the rotation step are linked so that the injection direction of the wear-resistant material as viewed from the axial direction is substantially constant. 3. The method of spraying an inner wall of a turbine housing according to claim 1, wherein in the rotating step, a rotation speed of rotating the turbine housing is changed according to a rotation position. 4. The turbine housing inner wall according to claim 1, wherein the turbine housing has a plurality of scroll passages, and performs an injection step and a rotation step for each scroll passage. Spraying method