DE102009023617A1 - Device for thermal coating of an interior surface of a bore, comprises a rotatable burner, which is introduced in a first opening of the bore, and a suction device, which is arranged in the area of a second opening of the bore - Google Patents

Abstract

The device for thermal coating of an interior surface of a bore, comprises a rotatable burner (1), which is introduced in a first opening of the bore, and a suction device, which is arranged in the area of a second opening of the bore. A rotor (8) is arranged in the area of a suction flow between the burner and the suction device. The rotor is a repeller and is driven through the suction flow in electric, pneumatic, hydraulic and/or mechanic manner. The rotor is arranged on the burner or on the suction device and is coupled with the burner or with the suction device. The device for thermal coating of an interior surface of a bore, comprises a rotatable burner (1), which is introduced in a first opening of the bore, and a suction device, which is arranged in the area of a second opening of the bore. A rotor (8) is arranged in the area of a suction flow between the burner and the suction device. The rotor is a repeller and is driven through the suction flow in electric, pneumatic, hydraulic and/or mechanic manner. The rotor is arranged on the burner or on the suction device and is coupled with the burner or with the suction device in electric, pneumatic, hydraulic and/or mechanic manner. The rotor has a rotor blade (10). A tilt bias angle of the rotor blade is adjustable in rotating rotor. The active area of the rotor blade is formed in rectangular and/or plain manner. The rotor is braked in electric, pneumatic, hydraulic and/or mechanic manner. A number of revolutions the rotor is pretended. The rotor is made of heat-resistant plastic, metal or ceramics.

Description

The The invention relates to a device for thermal coating according to the features of the preamble of claim 1.

From the prior art, as in the US 5,439,714 described a method for thermal spraying an inner surface of a bore known. In this case, a deflection element for deflecting the spray material, which has an inclined deflection surface at an end facing the burner, introduced into the bore. The deflecting element and the burner are moved synchronously during the thermal spraying so that the distance between them remains constant. The deflection element deflects the particle beam onto the inner surface to be coated.

In the JP 2008240020 A For example, a thermal spraying apparatus and method will be described. The apparatus comprises a movement control means for moving and a rotation control means for rotating a burner. At the lower end of the burner, a nozzle is laterally arranged to spray thermal spray particles or air on an inner side of a cylinder bore. At the upper end of the burner above the nozzle, a Spritzpartikelabschirmelement is arranged to avoid overspray, ie impingement of thermal spray particles on uncoated upper areas of the cylinder bore during thermal spraying. Furthermore, the device comprises a suction tube at the lower end of the cylinder bore for sucking off not adhering to the surface to be coated spray particles during thermal spraying.

Of the Invention is based on the object, an improved device to specify for thermal coating.

The The object is achieved by a device for thermal coating solved with the features of claim 1.

preferred Embodiments and developments of the invention are in the dependent Claims specified.

A Device for thermally coating an inner surface a bore comprises a burner which opens into a first opening the bore is insertable, and a suction device, which arranged in the region of a second opening of the bore is.

According to the invention in the area of a suction flow between the burner and the suction device arranged at least one rotor.

through This rotor is a turbulence of the suction flow producible, so that a deposit of spray particles, which is not adhere to the inner surface of the bore to be coated remain preventable on surfaces not to be coated is. Such a deposit, also referred to as overspray, is To avoid according to the prior art only with great effort or remove. For example, dividers or masks used to protect areas not to be coated or it takes place an overspray removal by means of high pressure water jets. By the solution according to the invention are such Measures no longer necessary, since spray particles no longer deposit on non-coated areas, but can be sucked by means of the suction device. As a result, a manufacturing effort and manufacturing costs, since keeping, attaching, Removal, cleaning and preparation of dividers and masks and the overspray removal by means of high-pressure water jets is dispensed with, considerably simplifies the device for thermal coating is shortened, a process chain of thermal coating is and fewer employees are required.

Of the Burner is suitably rotatable, so that on a fixed component with a hole, for example an internal combustion engine with a cylinder bore, the inner surface the bore is coatable all around. This is the burner in the Bore retractable, in this lowerable and retractable. By Rotation of the burner during which is the inner surface completely with thermally meltable spray particles coatable, wherein in the arc an arc for melting at least a consumable electrode is generated and the molten spray particles by means of a nebulizer gas on the inner surface to be coated are sprayable.

In In a preferred embodiment, the rotor is a repeller, d. H. it is rotatably mounted and, preferably exclusively, drivable by the suction flow. As a result, the device is very easy to set up, because no additional drive means are required for the rotor.

In In another embodiment, the rotor is electrical, pneumatically, hydraulically and / or mechanically drivable. To this Way, a rotational speed of the rotor is independent from a flow rate of the suction flow. By such a drive of the rotor is the suction flow no energy to deprive the rotor, so that a unrestricted strong suction flow remains.

In In an advantageous embodiment, the rotor is at the burner arranged so that a turbulence of the suction flow can be produced directly on the burner and non-adhering spray particles, So waste particles are immediately detectable by the turbulence. One direction of rotation of the rotor can be both a direction of rotation correspond to the burner as well as this be directed against.

He follows a drive of the rotor not via the suction flow, so the rotor is preferably pneumatic with the rotating burner, hydraulically and / or mechanically coupled. That way is the Rotor drivable by the rotation of the burner, for example via a gearbox.

In A further advantageous embodiment is the rotor arranged on the suction device, so that it in one embodiment as a repeller by the strong suction flow directly to the suction device is optimally driven and a turbulence generated, which in the area of the suction flow up extends into the bore. Furthermore, the rotor is also with the Suction device pneumatically, hydraulically and / or mechanically coupled and drivable in this way. Since the rotor on the suction device arranged, are easily and quickly different burners can be used, so that the device is flexible and quickly convertible is to inner surfaces of holes in different workpieces to coat. Also in this embodiment, the Direction of rotation of the rotor correspond to both the direction of rotation of the burner as opposed to this.

Of the Rotor expediently has at least one rotor blade Preferably, the rotor comprises a plurality of rotor blades, which preferably evenly distributed on the rotor are arranged to avoid an imbalance of the rotor.

The at least one rotor blade has an angle of attack between 1 ° and 89 °. Depending on the application and strength of the Suction flow rotors can be used with a corresponding angle of attack, to achieve optimal turbulence. An angle of attack is preferred the at least one rotor blade when stationary and / or by itself rotatable rotor adjustable, for example, before the start of the thermal Coating or more preferably during the thermal Coating, so that at any time optimal turbulence of the suction flow is achievable.

A Working surface of the at least one rotor blade, preferably the Plurality of rotor blades, is expediently essentially rectangular and / or flat. For optimal turbulence and the lowest possible To achieve energy expenditure for driving the rotor is the effective area the at least one rotor blade or the plurality of rotor blades preferably polished very smooth. This is especially true for one As a repeller operated rotor of great importance to the Suction flow to extract as little energy as possible, so that an optimal strong suction is ensured. A rotor with such a rotor blade or preferably with a plurality of such Rotor blades very efficiently creates a necessary turbulence the suction flow and is inexpensive and easy Can be produced because no complicated aerodynamic formations the rotor blades are to produce.

In According to an advantageous embodiment, the rotor is electric, pneumatically, hydraulically and / or mechanically brakable. To this Way is an optimal speed of the rotor adjustable, which preferably at least 50% of a speed of the burner amount should. This is an optimal turbulence of the suction flow ensured.

Conveniently, the speed of the rotor can be specified, for example by selection a suitable rotor, the rotor blades optimal Angle of attack for the respective suction flow by adjusting the angle of attack before or during the thermal spraying, by the drive of the rotor and / or by braking the rotor. This way is always one optimal turbulence of the suction flow generated. The Speed of the rotor can be throughout the thermal Coating to be constant. When coating a cylinder bore However, it increases advantageously with an internal combustion engine Increasing penetration depth of the burner in the hole, since the burner with increasing penetration of a crankcase the internal combustion engine approaches, which is larger is considered the bore, allowing to maintain the vortex a higher speed of the rotor is required. Furthermore is to ensure optimal turbulence in this area, Particle deposits are particularly important in the crankcase are avoided.

Conveniently, the rotor is made of a heat-resistant material, in particular made of a heat-resistant plastic, for example polyetheretherketone (PEEK), of metal, for example steel or aluminum, or of Ceramics. As a result, wear of the rotor is low, so that it can be used for a long time and requires maintenance for replacement of the rotor is low. Such a rotor, in particular made of steel, Aluminum or polyetheretherketone (PEEK) is also simple and inexpensive to produce. The rotor is for example by means of a casting process or a machining process produced.

The device is preferably used for coating an inner surface of a cylinder bore of an internal combustion engine, so that combustion engines with thermally coated cylinder liners can be produced very efficiently, ie at low cost and in a short production time, which are optimized in terms of consumption due to a resulting friction reduction and a lower CO ₂ -Emission exhibit.

embodiments The invention will be explained in more detail with reference to drawings.

there demonstrate:

1 a perspective view of a burner with a rotor,

2 a burner with a rotor in an upper position in a bore,

3 a burner with a rotor in a lower position in a bore,

4 a rotor on a suction device and a burner in an upper position in a bore, and

5 a rotor on a suction device and a burner in a lower position in a bore.

each other corresponding parts are in all figures with the same reference numerals Mistake.

1 shows a perspective view of a burner 1 a device 2 for thermal coating of an inner surface 3 a hole 4 , The burner 1 is preferably rotatable and is in a first opening 5 the bore 4 insertable, lowerable and retractable. From a nozzle 6 of the burner 1 are spraying particles on the inner surface 3 the bore 4 aufspritzbar, whereby by these movements of the burner 1 the entire inner surface 3 the bore 4 coatable.

The spray particles are in the burner 1 for example, by melting at least one consumable electrode by means of an arc generated, wherein the consumable electrode is traceable as a wire. This process is called arc wire spraying. The melted spray particles are by means of a Zerstäubergases from the nozzle 6 of the burner 1 in a particle beam 7 on the inner surface 3 the bore 4 aufspritzbar.

In the embodiment shown here is at the lower end of the burner 1 a rotor 8th arranged and rotatably mounted. In another, in the 4 and 5 illustrated embodiment, the rotor 8th at a suction device 9 the device 2 arranged or integrated into this. The rotor 8th includes a plurality of rotor blades 10 , wherein an effective surface of the rotor blades 10 is substantially rectangular and flat. As no aerodynamically elaborate rotor blades 10 to produce is the rotor 8th easy and inexpensive to produce. The rotor blades 10 are arranged at an angle between 1 ° and 89 °.

The rotor 8th is made of a heat-resistant material, in particular of a heat-resistant plastic, for example polyetheretherketone (PEEK), of metal, for example steel or aluminum, or of ceramic. This is a wear of the rotor 8th low, so it can be used for a long time and a maintenance effort to replace the rotor 8th is low. Such a rotor 8th , In particular of steel, aluminum or polyetheretherketone (PEEK) is also easy and inexpensive to produce, for example by means of a casting process or a machining process. This rotor 8th is with a little effort, for example, to an existing burner 1 or at a suction device 9 with small modifications can be arranged, so that the device 2 can be produced with a low cost, manufacturing and time.

The 2 and 3 show an embodiment of the device 2 , with the suction device 9 at a second opening 11 the bore 4 and with the burner 1 with rotor 8th passing through the first opening 5 into the hole 4 is introduced and turned in 2 in an upper position and in 3 in a lower position in the hole 4 located.

The hole 4 In the example shown here is a cylinder bore of an internal combustion engine, which is to be coated to produce a thermally coated cylinder bore, whereby the internal combustion engine is optimized in terms of consumption due to a resulting friction reduction and has a lower CO ₂ emission.

The burner 1 is in the hole 4 movable up and down and rotatable so that the entire inner surface 3 the bore 4 coatable. Spray particles, which are not on the inner surface to be coated 3 stick, for example, bounce off this are waste particles 12 and by means of the suction device 9 out of the hole 4 otherwise they suck on surfaces that are not to be coated 13 attach and form on this only consuming to be removed so-called overspray.

To during the suction during a passage of the waste particles 12 through the hole 4 and in an internal combustion engine, in particular when passing through a crankcase, adhering to the surfaces not to be coated 13 To prevent is by means of the rotor 8th a vortex in one through the suction device 9 generated suction flow 14 producible so that these waste particles 12 with the suction flow 14 be swirled and thus preserved in this. This is an optimal extraction of this waste particles 12 ensured. One direction of rotation of the rotor 8th can be both a direction of rotation of the burner 1 correspond as well as be directed against this.

The rotor 8th is, both with an arrangement at the burner 1 as well as on the suction device 9 , preferably a repeller, ie it is exclusively by the suction flow 14 drivable. This is the device 2 very simple, because no additional drive means for the rotor 8th required are. For optimum turbulence and the lowest possible energy expenditure for driving the rotor 8th to reach, are the effective surfaces of the rotor blades 10 preferably polished very smooth. This is especially true for a rotor operated as a repeller 8th of great importance to the suction flow 14 to extract as little energy as possible, so that an optimally strong suction is ensured.

The angle of attack of the rotor blades 10 is, for example, to adapt to different levels of suction 14 , preferably with stationary and / or rotating rotor 8th adjustable, for example, before the start of the thermal coating or particularly preferably during the thermal coating, so that at any time an optimal turbulence of the suction flow 14 is achievable. Alternatively, for example, the rotor 8th replaceable, so that depending on the application, a rotor 8th with rotor blades 10 can be used, which each have an optimal angle of attack to produce a required turbulence.

Alternative to the repeller embodiment is the rotor 8th for example, also electrically, pneumatically, hydraulically and / or mechanically drivable. In this way, a rotational speed of the rotor 8th independent of a flow rate of the suction flow 14 , By such a drive of the rotor 8th is the suction flow 14 no energy to drive the rotor 8th to withdraw, leaving an unrestricted strong suction flow 14 preserved. For such a drive is the rotor 8th for example with the rotating burner 1 pneumatically, hydraulically and / or mechanically coupled. This is the rotor 8th by a rotation of the burner 1 drivable, for example via a transmission.

The 4 and 5 show a further embodiment of the device 2 in which the described rotor 8th not at the burner 1 but at the suction device 9 is arranged and is integrated in this, wherein the burner 1 in 4 in an upper position and in 5 in a lower position in the hole 4 located. Is the rotor 8th executed as a repeller, it is due to the strong suction flow 14 directly at the suction device 9 optimally driven and generates a turbulence, which in the area of the suction flow 14 from the suction device 9 into the hole 4 extends.

Furthermore, the rotor 8th also with the suction device 9 pneumatically, hydraulically and / or mechanically coupled and drivable in this way. Because the rotor 8th at the suction device 9 arranged, are easily and quickly different burners 1 can be used, so that the device 2 flexible and quickly convertible to inner surfaces 3 of holes 4 to coat in different workpieces. Also in this embodiment, the direction of rotation of the rotor 8th both the direction of rotation of the burner 1 correspond as well as be directed against this.

In an advantageous embodiment, the rotor 8th , which at the burner 1 or at the suction device 9 is arranged, electrically, pneumatically, hydraulically and / or mechanically braked. In this way is an optimal speed of the rotor 8th adjustable, which preferably at least 50% of a speed of the burner 1 should be. This is an optimal turbulence of the suction flow 14 ensured.

The speed of the rotor 8th is advantageously predetermined, for example by selecting a suitable rotor 8th , its rotor blades 10 an optimal angle of attack for the respective suction flow 14 have, by adjusting the angle of attack of the rotor blades 10 before or during the thermal spraying, by the drive of the rotor 8th and / or by braking the rotor 8th , In this way, at any time an optimal turbulence of the suction flow 14 produced.

The speed of the rotor 8th can be constant throughout the thermal coating. In particular, in the coating of a cylinder bore of an internal combustion engine and at the burner 1 arranged rotor 8th However, it is advantageous if the speed is specifiable such that they with increasing penetration depth of the burner 1 into the hole 4 rises, as the burner 1 with increasing penetration depth approaches the crankcase of the engine, which is larger than the bore 4 , so that to maintain the turbulence a higher speed of the rotor 8th is required. Furthermore, in this area to ensure optimum turbulence, as esp Especially in the crankcase particle deposits are to be avoided.

Through the device 2 are, for example, partitions or masks to protect surfaces not to be coated 13 and overspray removal by high-pressure water jets is no longer necessary because of waste particles 12 no longer on surfaces that are not to be coated 13 deposit, but by means of the suction device 9 are sucked. As a result, a production cost and manufacturing costs are reduced, as a holding, attaching, removing, cleaning and processing of dividers and masks and the overspray removal by means of high-pressure water jets omitted, the device 2 is significantly simplified for thermal coating, a process chain of thermal coating is shortened and fewer employees are required.

1

burner

2

contraption

3

palm

4

drilling

5

first opening

6

jet

7

particle beam

8th

rotor

9

suction

10

rotor blade

11

second opening

12

waste particles

13

Not to be coated surface

14

aspiration

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• US 5439714 [0002]
• - JP 2008240020 A [0003]

Claims (15)

Contraption ( 2 ) for thermally coating an inner surface ( 3 ) of a bore ( 4 ) comprising a burner ( 1 ), which in a first opening ( 5 ) of the bore ( 4 ) is insertable and a suction device ( 9 ), which in the region of a second opening ( 11 ) of the bore ( 4 ), characterized in that in the region of a suction flow ( 14 ) between the burner ( 1 ) and the suction device ( 9 ) at least one rotor ( 8th ) is arranged. Contraption ( 2 ) according to claim 1, characterized in that the burner ( 1 ) is rotatable. Contraption ( 2 ) according to claim 1 or 2, characterized in that the rotor ( 8th ) is a repeller and by the suction flow ( 14 ) is drivable. Contraption ( 2 ) according to claim 1 or 2, characterized in that the rotor ( 8th ) is electrically, pneumatically, hydraulically and / or mechanically driven. Contraption ( 2 ) according to one of claims 1 to 4, characterized in that the rotor ( 8th ) on the burner ( 1 ) is arranged. Contraption ( 2 ) according to claim 5, characterized in that the rotor ( 8th ) with the burner ( 1 ) is pneumatically, hydraulically and / or mechanically coupled. Contraption ( 2 ) according to one of claims 1 to 4, characterized in that the rotor ( 8th ) at the suction device ( 9 ) is arranged. Contraption ( 2 ) according to claim 7, characterized in that the rotor ( 8th ) with the suction device ( 9 ) is pneumatically, hydraulically and / or mechanically coupled. Contraption ( 2 ) according to one of the preceding claims, characterized in that the rotor ( 8th ) at least one rotor blade ( 10 ) having. Contraption ( 2 ) according to claim 9, characterized in that an angle of incidence of the at least one rotor blade ( 10 ) with the rotor standing and / or rotating ( 8th ) is adjustable. Contraption ( 2 ) according to claim 9 or 10, characterized in that an active surface of the at least one rotor blade ( 10 ) is substantially rectangular and / or flat. Contraption ( 2 ) according to one of the preceding claims, characterized in that the rotor ( 8th ) is electrically, pneumatically, hydraulically and / or mechanically braked. Contraption ( 2 ) according to one of the preceding claims, characterized in that a rotational speed of the rotor ( 8th ) can be specified. Contraption ( 2 ) according to one of the preceding claims, characterized in that the rotor ( 8th ) is made of a heat-resistant material, in particular of a heat-resistant plastic, metal or ceramic. Use of the device ( 2 ) according to one of claims 1 to 14 for coating an inner surface of a cylinder bore of an internal combustion engine.