JP3568113B2 - Standby support device for thermal spray head - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a high thermal spraying process for forming a thermal spray coating by applying a thermal spray material in a molten or semi-molten state to a material to be processed (thermally sprayed substrate) together with a high hot air flow, and particularly to a support device for a thermal spray head. Specifically, the present invention relates to, but not limited to, supporting a thermal spraying head in a case where the thermal spraying head is temporarily put in a high-temperature airflow jetting state for replacing a workpiece or observing a film.
[0002]
[Prior art]
Examples of the thermal spraying method for forming various functional films on the object surface by high thermal spraying include gas spraying, arc spraying, plasma spraying, and high-speed frame spraying. In any of the thermal spraying methods, a high-temperature air stream is blown out from a thermal spraying head and applied to a thermal spray base material together with a thermal spray material in a molten or semi-molten state to form a thermal spray coating.
[0003]
The thermal spray head generates a large amount of noise due to the blowing of a high-temperature air flow, for example, 120 dB for plasma spraying and 130 dB for high-speed frame spraying, and soundproofing is indispensable. Therefore, thermal spraying is performed in the soundproof room.
[0004]
In the thermal spraying of mass products, the thermal spray base material (raw material) is carried into the soundproof room, and when the thermal spraying is completed, the thermal spray substrate is carried out of the soundproof room and the next thermal spray substrate is carried into the soundproof room. In order to prevent noise from leaking outside when the thermal spray base material is taken in and out, a soundproof room having a double door structure is employed as shown in FIG. The base material that has been sprayed at the spray position D is moved to the E position in the soundproof room, the unsprayed base material at the C position is placed at the spray position D, spraying is started, the inner door is opened, and the spray at the E position is completed. The base material is moved to the F position, the unsprayed base material at the B position is moved to the C position, the inner door is closed, and the outer door is opened to move the sprayed base material at the F position to the G position of the carry-out path, and The unsprayed substrate at the position A is moved to the position B and the outer door is closed. The above is executed every time one thermal spraying is completed. Thus, the inner door and the outer door are not opened at the same time, and the noise of the thermal spraying construction is prevented from leaking to the outside through the entrance opening.
[0005]
[Problems to be solved by the invention]
However, two entrance / door structures having high soundproofing effect are required, and the structure of the soundproof room is complicated and expensive equipment. It is conceivable to stop the operation of the thermal spray head (high hot air flow injection) every time the thermal spray base material is replaced. However, it is necessary to allow the thermal spray head operation (high hot air flow) to stabilize at the time of restarting. In the case of plasma spraying, frequent starting and stopping tend to shorten the life of mechanical elements of the spraying head, for example, repetition of starting and stopping shortens the life of the electrode.
[0006]
An object of the present invention is to reduce noise leaking from a thermal spraying construction space to the outside.
[0007]
[Means for Solving the Problems]
(1) receiving a front end face (1t) of a thermal spray head (1) for blowing out a high-temperature air flow to form a thermal spray coating on a thermal spray base material; the front end face being larger than the high-temperature air flow injection port and smaller than the front end face; A heat-resistant member (52) having an opening (51);
An elastic seal member (53) having an inner space larger in diameter than the opening (51) and supporting the heat-resistant member (52);
A tubular member (55) having an open end (54) for supporting the heat-resistant member (52) through the seal member (53);
A standby support device for a thermal spray head, comprising:
[0008]
In addition, in order to facilitate understanding, the reference numerals of the corresponding elements in the embodiments shown in the drawings and described later are added in the parentheses for reference. The same applies to the following.
[0009]
According to this, for standby, the thermal spray head (1) with the hot air flow blown out is passed through the opening (51) of the heat resistant member (52) and the inner space of the seal member (53). When the front end face (1t) of the thermal spray head (1) is pressed against the outer surface of the heat-resistant member (52) so as to pass through the inner space of the tubular member (55), the thermal spray head (1) is turned on. Supported by a member. In this state, the high-temperature air flow is cut off from the thermal spraying space by the cylindrical member (55), and the sound wave of the thermal spray head (1) is absorbed by the seal member (53) via the heat-resistant member (52). The noise generated by the head (1) and the high hot air flow is absorbed and cut off by the standby support device, and the noise radiation to the thermal spraying space is reduced. That is, noise leaking from the thermal spraying space to the outside when the thermal spraying head (1) is in the standby state is reduced.
[0010]
BEST MODE FOR CARRYING OUT THE INVENTION
(2) The standby support device for a thermal spray head according to (1), wherein the other open end of the cylindrical member (55) is connected to a dust collection duct. The gas in the dust collection duct is sucked into the dust collector. The dust collector first collects the dust of the suction gas with a filter, captures the fine dust passing through the filter with an electric dust collector, and detoxifies the harmful gas with a catalyst. The filter absorbs noise.
[0011]
(3) The standby support device for a thermal spray head according to the above (1) or (2), wherein the cylindrical member (55) has a flow path (56) for passing a cooling medium. By flowing the cooling medium through the flow path (56), the life of the tubular member (55) is long even if the spraying head is kept on standby for a long time, and it is possible to avoid overheating of the dust collection duct or the dust collector.
[0012]
Other objects and features of the present invention will become apparent from the following description of embodiments with reference to the drawings.
[0013]
【Example】
FIG. 1 shows the appearance of a standby support device 5 for a thermal spray head according to one embodiment of the present invention. The substrate supporting device 10 for supporting the substrate to be sprayed can travel along the rail 6 and is carried by a carrier vehicle (not shown) to the spraying position shown in the drawing, and is unloaded from the spraying position after the spraying is completed. .
[0014]
Above the spraying position, there are two horizontal y-beams 4a and 4b, to which a horizontal x-beam 3x is connected so as to be movable in the y-direction. The beam 3z is connected, and the carriage 2 is connected to the vertical z-beam 3z so as to be movable in the z direction. The carriage 2 supports the spray head 1 of the plasma spray torch. The carriage 2 and the vertical z-beam 3z are equipped with an electric z-drive for driving the carriage 2 in the z-direction, but are not shown. The vertical z-beam 3z and the horizontal x-beam 3x are equipped with an electric x-drive device for driving the vertical z-beam 3z in the x direction, but their illustration is omitted. The horizontal x-beam 3x and the horizontal y-beams 4a and 4b are provided with an electric y-drive device for driving the horizontal x-beam 3x in the y-direction, but their illustration is also omitted. The plasma spray head 1 (downward plasma spray nozzle) is moved to any point (x, y) of the standby support device 5 of the spray head and the horizontal projection area of the base material support device 10 by these z, x, y driving devices. Can also be positioned at the required height (z).
[0015]
The stand-by support device 5 receives the plasma flame 1f ejected downward from the head 1 and supports the head 1 below. The dust collection duct 7 is continuous with the head, and the dust collection duct 7 passes below the floor wall. And it is connected to the dust collector of the purification exhaust room. The central axis of the stand-by support device 5 is a stand-by position (home position) of the head 1 (the plasma injection nozzle thereof), and the head 1 is placed there and is supported below by the device 5 to ignite plasma and spray flame ( Adjustment of a high-temperature or high-temperature molten or semi-melted thermal plasma containing a sprayed material, standby on a low heat, and the like are performed.
[0016]
When the substrate support device 10 on which the thermal spray substrates Wa to Wl are mounted is positioned at the illustrated thermal spray position, the thermal spray flame of the thermal spray head 1 which is supported by the device 5 (waiting at the home position), that is, After adjusting the plasma flame to the one required for spraying, the head 1 is moved by a z, x, y driving device to a schedule (spraying trajectory) registered in advance in a computer (not shown) by teaching work. ), Is sequentially driven above the sprayed substrates Wa to Wl, and moves along the x, y scanning locus set by teaching with respect to each sprayed substrate. Is completed, the spraying flame is lowered to the low heat at the stand-by time, returned to the home position and supported by the apparatus 5 to stand by.
[0017]
FIG. 2 shows an enlarged vertical section (section parallel to the x, z plane) of the standby support device 5. The lower end of a copper double cylinder 55 forming a cooling water flow space 56 is fixed to the dust collection duct 7 penetrating the floor, and the inner space of the double cylinder 55 communicates with the inner space of the dust collection duct 7. ing. A cooling water inlet 57 is provided at a lower portion of the outer cylinder of the double cylinder 55, and a cooling water outlet 58 is provided at an upper portion. The cooling water press-fitted into the inlet 57 passes through a cooling water flow space 56 and is discharged. It reaches 58 and goes out of the cylinder from there. The upper end of the double cylinder 55 has a slightly smaller diameter and penetrates a silicone rubber elastic seal ring 53. A ceramic disk 52 having high heat resistance and high insulation is placed on the seal ring 53. The ceramic disk 52 is for supporting the end plate 1t (anode: copper thick plate) of the plasma spraying head 1 where the plasma injection nozzle is open, and has a plasma flame (high hot air flow) at the center thereof. There is an opening 51 for receiving 1f, which is larger in diameter than the plasma spray nozzle of the plasma spraying head 1 but smaller in diameter than the outer diameter of the end plate 1t.
[0018]
When the plasma spraying head 1 (end plate 1t) is placed on the ceramic disk 52 and pressed down slightly, the pressure is applied by the ceramic disk 52 to compress the seal ring 53, and the ceramic disk 52 / seale ring 53/2 is pressed. The space between the upper ends of the heavy cylinders 55 forms an airtight seal. The slightly smaller diameter cylinder at the upper end of the double cylinder 55 prevents the high thermal radiation of the plasma flame 1f from directly hitting the inner surface of the seal ring 53. Immediately before the head 1 that is spraying the plasma flame 1f is arranged at the position shown by the two-dot chain line in FIG. 2 and when the head 1 is moved from the arrangement position to the thermal spraying position, the high thermal radiation of the plasma flame 1f is generated. In order to prevent the outer surface of the seal ring 53 from directly hitting, an inverted cup-shaped ceramic cap 59 having an opening with a larger diameter than the end plate 1t is provided on the upper bottom, and the ceramic disk 52, the seal ring It is mounted on the upper end of double cylinder 55 so as to cover the outer surfaces of 53 and the upper end of double cylinder 55.
[0019]
The soundproof room has an ordinary simple single-door structure, and during the time for changing the object to be sprayed, that is, during the standby time, as shown by a two-dot chain line in FIG. 5, the noise of the plasma flame 1f is blocked by the double cylinder 55, and a part of the noise of the thermal spray head 1 is absorbed by the seal ring 53 via the ceramic disk 52. Even if the object to be sprayed is opened by opening the door, noise leakage is small and the surrounding environment can be protected.
[0020]
For example, thermal spraying is sequentially performed on the substrates Wa to Wl of the substrate supporting device 10 at a current value of 1150 A, and when the thermal spraying of the last substrate Wh is completed, the current value is reduced to 150 A and the thermal spray head 1 is moved to 2 in FIG. It is moved to the position shown by the dashed line and is supported below by the standby support device 5, the substrate support device 10 is unloaded from the thermal spraying position, and another substrate support device equipped with an unsprayed substrate is loaded. The spraying position was determined, and the current value of the spraying head 1 was increased to 1150 A. After the current was stabilized, the spraying head was pulled up from the standby support device 5 and moved to the spraying position, and spraying was performed. The noise in the soundproof room when applying a current value of 1150 A to the thermal spraying head 1 and performing spraying was approximately 114 dB. When the current value was reduced to 150 A after the spraying, the noise in the soundproof room was reduced to approximately 100 dB. . Next, when the thermal spray head 1 was mounted on the standby support device 5 as shown by a two-dot chain line in FIG. 2, that is, when the thermal spray head 1 was placed at the standby position, the noise in the soundproof room was reduced to approximately 87 dB.
[0021]
Thermal spraying is a method in which the raw material powder of the thermal spray coating is sprayed onto the substrate to be sprayed in a molten or semi-sprayed state together with the plasma flame, so that the powder that has not contributed to the film formation is scattered, so that it is collected by a dust collector. Then, a double cylinder 55 is connected to the dust collection duct 7. When the thermal spray head 1 is mounted on the standby support device 5 and is on standby, the heat, gas and powder of the plasma flame injected by the head 1 are discarded in the dust collecting duct 7, and a dust collector (not shown) connected to the dust collecting duct 7. Filters collect powder and absorb noise. The fine dust that has passed through the filter is captured by an electrostatic precipitator, and the harmful gas is detoxified by a catalyst.
[0022]
In order to reduce wasteful consumption of raw materials and the burden on the dust collector, the supply of the raw material powder to the thermal spray head 1 can be cut off during the standby mode. Since it takes time for the amount of the semi-molten powder to stabilize, it is preferable to continue the powder supply during standby as an operation with a short standby time.
[Brief description of the drawings]
FIG. 1 is a perspective view showing an appearance of a standby support device 5 according to an embodiment of the present invention.
FIG. 2 is an enlarged vertical sectional view of the standby support device 5 shown in FIG.
FIG. 3 is a plan view showing an inner space of a soundproof room having a double door structure.
[Explanation of symbols]
1: Spray head 1t: End plate 1f: Plasma flame 2: Carriage 3x: X beam 3z: Z beam 4a, 4b: Y beam 5: Stand-by support device 51 of spray head 51: Opening 52: Ceramic disk 53: Seal ring 54: Open end 55: Double cylinder 56: Cooling water flow space 57: Cooling water inlet 58: Cooling water outlet 59: Ceramic cap 6: Rail 7: Dust collection duct 10: Sprayed substrate support device 15a , 15b: Pin 20: Mask plate Wa to Wl: Thermal spray substrate

Claims (3)

A heat-resistant member that receives a front end face of a thermal spray head for blowing a high-temperature air stream to form a thermal spray coating by applying the high-temperature air stream to the thermal spray substrate, the heat-resistant member having an opening larger than the high-temperature air flow injection port of the front end face and smaller than the front end face;
A resilient seal member having an inner space larger in diameter than the opening and supporting the heat-resistant member;
A tubular member having an open end for supporting the heat-resistant member via the seal member;
A standby support device for a thermal spray head, comprising: The standby support device for a thermal spray head according to claim 1, wherein the other open end of the cylindrical member is connected to a dust collection duct. The standby support device for the thermal spray head according to claim 1 or 2, wherein the cylindrical member has a flow path for passing a cooling medium.

Images