JP2984691B2 - Arc spraying equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an arc spraying apparatus for performing spraying while forcibly sending out a pair of sprayed wires, and relates to an improved form of feeding the sprayed material.

[0002]

2. Description of the Related Art As a basic apparatus form of this kind of arc spraying apparatus, a pair of wires are forcibly fed by a feed roller, and a pair of fed out molten materials are formed by a deflecting guide tube at a droplet generating position. It has been widely adopted to guide the deflection toward the inner surface, to bring the molten material into contact with the inner surface of the deflection guide tube at the time of the deflection, and to supply an arc current to the molten material via the guide tube. For example, an arc spraying apparatus disclosed in Japanese Patent Application Laid-Open No. 61-167472 is one of them.

[0003]

In the conventional apparatus as described above, for example, when the diameter of the used molten material becomes small or the softness of the molten material increases, the arc falls into an unstable state, It was easy to cause troubles such as thermal spray interruption. Causes of arc instability include poor contact between the molten material and the diverting guide tube and wobble at the tip of the molten material at the position where the droplets are generated.In both cases, the guide hole diameter is larger than necessary than the molten material diameter. This can be explained by the "dancing phenomenon".

[0004] The "dancing phenomenon" occurs when the bent portion of the molten material moves in the molten material feeding direction or in a direction intersecting the feeding direction due to unevenness of the feed resistance acting on the molten material or unevenness of the hardness or shape of the molten material itself. This is noticeable when the guide hole diameter is large. In order to avoid such a "dancing phenomenon", the diameter of the guide hole of the deflection guide tube is set in accordance with the diameter of the molten material. Therefore, in the conventional apparatus, it is necessary to prepare various types of guide tubes according to the type of the used melting material, and the management and operation thereof become complicated.
It is necessary to disassemble the thermal spraying device and replace the deflection guide tube every time the used welding material is different, and this changeover was troublesome and time-consuming, and the disadvantage was inevitable. Therefore, in order to avoid such a changeover, the actual situation is that a dedicated machine must be manufactured according to the thickness of the molten material.

As a means for eliminating poor contact, the entire deflection guide tube is gently curved, but this increases the manufacturing cost of the deflection guide tube, and the mounting of the guide tube. When the positional accuracy is low, it is difficult to make the tip of the molten material intersect at one point, and there has been a defect that the arc becomes unstable.

The present invention has been made to solve the above-mentioned problems, and realizes a common use of a current collecting guide tube by improving a diverting guide tube. The purpose is to simplify the accompanying changeover and improve the productivity of the thermal spraying operation. Another object of the present invention is to make it possible to reliably supply power and guide the droplet to the droplet generating position by using a straight deflection guide tube, and to reduce the manufacturing cost.

[0007]

According to the present invention, the diverting guide tube 15 for deflecting and guiding the molten material W to supply electric power and the guide member 17 for feeding and guiding the fusible material W toward the droplet generating position Q are used. Feeding is performed, and the mounting position of the deflection guide tube 15 is changed back and forth so as to be able to cope with the difference in the used melting material.

That is, according to the present invention, as shown in FIG. 1, there is provided a molten material feeding mechanism 2 housed in a case 1 for feeding a pair of molten materials W toward the front of the case. Deflection guide tube 1 for deflecting and guiding the melt W sent from the feed mechanism 2 and supplying an arc current to the melt W
5 and a guide member 17 for feeding and guiding the molten material W sent from the deflection guide tube 15 to a droplet generation position Q on the front outer surface of the case 1. Is connected to the tube center axis G
It is required to be screwed so that the front and rear position can be changed along. The deflection guide tube 15 and the guide member 17 are formed linearly.

[0009]

The turning guide tube 15 is connected to the power supply terminal 3 via a screw.
The mounting position can be changed back and forth by changing the screwing amount. At this time, the position of the entrance 35 of the deflection guide tube 15 also changes, and moves up and down with respect to the feed center axis F defined by the material feed mechanism 2. Normally, the guide tube is mounted in a state where the center of the inlet 35 coincides with the feed center axis F. In the present invention, the position of the inlet 35 is changed according to the wire diameter.

That is, when the diameter of the guide hole 34 matches the diameter of the molten material, the center of the inlet 35 is made substantially coincident with the feed center line F, and as the diameter of the molten material becomes smaller, the diameter of the inlet 3 becomes smaller.
The center of 5 is positioned above or below the upper and lower feed center lines F. As the position of the inlet 35 shifts from the feed center line F, the degree of bending of the molten material W increases, and the guide hole 3
4 is pressed more strongly. Therefore, if the diameter of the guide hole 34 is adapted to the maximum diameter of the molten material, the front and rear positions of the deflection guide tube 15 are changed so that the small-diameter molten material W can be deflected without causing a “dancing phenomenon”. Power can be reliably supplied. The guide member 17 needs to be replaced in accordance with the diameter of the molten material in order to avoid the fluctuation of the molten material W. However, since the guide member 17 is mounted on the outer surface of the case, it can be easily replaced.

[0011]

As described above, according to the present invention, the molten material W sent from the molten material feeding mechanism 2 is deflected and guided by the diverting guide tube 15 and the guide member 17, and the diverted guide tube 15 is moved.
By changing the mounting position of the power supply terminal 16 to the front and rear, the degree of bending of the molten material W in the vicinity of the inlet 35 is changed. To ensure reliable contact. That is, the same guiding effect as the curved formation of the guide hole 34 could be achieved by the linear deflection guide tube 15. Therefore, according to the arc spraying apparatus of the present invention, the deflection guide tube 15 that mainly performs current collection is shared as it is, and only the guide member 17 that can be easily replaced is replaced. This makes it possible to perform thermal spraying of various types of the thermal spraying material W, thereby simplifying the operation of the arc thermal spraying apparatus and the change of the setup due to the change of the thermal spraying material used, and improving the productivity of the thermal spraying operation. In addition, since the molten material is supplied by the deflecting guide tube 15 and the guide member 17 which are formed linearly, the manufacturing cost can be reduced as compared with the case where a curved guide tube is used, and the molten material W can be reduced. Can be reliably sent.

[0012]

1 to 4 show an embodiment of an arc spraying apparatus according to the present invention. 2 and 3, the arc spraying apparatus performs arc spraying using a round wire-shaped material W, and passes through the material path so that the material W passes through the rectangular box-shaped case 1 in a vertically parallel posture. The case 1 is provided with a melt feeding mechanism 2 in the center of the inside of the case 1, and a nozzle 3 for blowing out compressed air for atomizing is arranged on the outer surface of the front end of the case 1.

In FIG. 3, the case 1 has a metal case body 4 having one side opening, insulating blocks 5 and 6 fixed to the front and rear ends of the case body 4, and the opening swings through a hinge 7. It includes a lid 8 that opens and closes, a bracket 9 for the nozzle 3 that covers the front surface of the front insulating block 5, and the like. The lid 8 is maintained in the closed position by the latch 10, and can be easily opened by pulling the latch 10 against the spring. The bracket 9 can be removed from the insulating block 5 by loosening the screw 11, which is convenient for exchanging the nozzle 3 and the guide member 17.

In order to feed and guide the molten material W, a pair of upper and lower guide tubes 14 are fixed to the rear insulating block 6, and a deflection guide tube 15 is mounted on the front insulating block 5 corresponding to the guide tubes 14. I am wearing it. The deflection guide tube 15 is screwed into a screw hole 16a penetrating the power supply terminal 16 back and forth,
The mounting position in the front-back direction can be adjusted.
The molten material W is supplied with an arc current through the guide tube 15.

A guide member 17 is screwed and fixed to the front side of the upper and lower power supply terminals 16 in order to feed and guide the molten material W toward the droplet generating position Q on the spraying central axis P. The two guide members 17 are arranged in an inclined posture in which respective protruding ends approach vertically.

The molten material feeding mechanism 2 is disposed between the deflecting guide tube 15 and the guide tube 14, and simultaneously feeds the upper and lower molten materials W toward the front of the case. In FIGS. 2 and 3, the molten material feeder tank 2 includes a drive roller 18 made of an insulator rotatably supported by upper and lower walls of the case body 4, and a molten material W.
And a motor 21 for rotating the drive roller 18 via a joint 20. The holding roller 19 is rotatably supported by one end of the spring arm 22 and is arranged vertically above and below the driving roller 18. The spring arm 22 is used to urge the pressing roller 19 against the pressure and to open and urge the lid 8. The motor 21 is housed in a grip 23. It can be started by turning on the switch 24 shown in FIG.

The nozzle 3 is formed in a vertically long rectangular shape. A groove 25 is provided in the center of the nozzle 3 to avoid the guide member 17, and a pair of nozzle openings for jetting jet air 26 along the left and right front edges of the groove 25. 27 is opened in a slit shape. 28 is an air hose, and 29 is a hose joint.

As shown in FIG. 4, the nozzle port 27 is disposed at a symmetrical position with respect to the spraying center axis P, and the jet center axis R of the jet air 26 is set at the spraying center axis P ahead of the droplet generation position Q. It is directed so as to converge toward the upper converging section S. Further, the vertical position of the nozzle port 27 is defined so that the vertical center of the jet air 26 coincides with the spraying central axis P. In the drawing, reference numeral 30 denotes a collective airflow formed ahead of the converging portion, and 31 denotes a shield frame for blocking arc light.

In FIG. 1, the deflecting guide tube 15 comprises a screw shaft having a hexagonal cross section at one end, and a guide hole 34 extending vertically along the axis of the screw shaft. An outwardly expanding tapered entrance 35 is provided at the end on the head 35 side. Reference numeral 36 denotes a lock nut 3
7 is a fastening seat.

The deflection guide tube 15 configured as described above.
In the case where the diameter of the guide hole 34 matches the wire diameter of the molten material W, the center of the entrance 35 is substantially coincident with the feed center line F of the drive roller 18, but as the wire diameter of the molten material W becomes smaller, Then, the center of the entrance 35 is shifted vertically from the feed center line F. More specifically, in the upper deflection guide tube 15, the amount of screwing into the power supply terminal 16 is reduced, and the center of the inlet 35 is positioned above the feed center line F. On the other hand, the center of the inlet 35 is positioned below the feed center line F in the lower deflection guide tube 15.

As described above, when the center of the inlet 35 is shifted up and down from the feed center line F of the drive roller 18, the molten material W is gradually bent near the inlet 35 and then guided into the guide hole 34, and the bent portion is formed. Makes contact with the guide hole 34 and performs a certain electricity. The degree of bending of the molten material W at this time is determined by the feed reaction force received by the molten material W from the guide hole 34 and the deformation stress of the bent molten material W, and the molten material W bends until these two acting forces are balanced. The tendency is that as the wire diameter of the molten material W becomes smaller and softer, the degree of bending becomes larger. Also,
The bent material W is strongly pressed against the guide hole 34 to increase the degree of contact with the power supply terminal 16. Therefore, the molten material W
Even when the wire diameter is small, the arc current can be reliably supplied by sharing the deflection guide tube 15 and the arc spraying can be performed in a stable state.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a detailed structure of a deflection guide tube.

FIG. 2 is a vertical sectional side view of a main part of the arc spraying device.

FIG. 3 is a cross-sectional plan view of a main part of the arc spraying device.

FIG. 4 is a cross-sectional plan view of a nozzle.

[Explanation of symbols]

2 ... Material feed mechanism, 15 ... Diversion guide tube, 16 ...
Power supply terminal 17 Guide member

Claims (2)

(57) [Claims] 1. A pair of molten materials W accommodated in a case 1
Feed mechanism 2 that feeds the material toward the front of the case, and guides the deflection of the melt W sent out from the melt feed mechanism 2,
A deflection guide tube 15 for supplying an arc current to the molten material W, and the molten material W sent from the deflection guide tube 15 are transferred to a case 1.
And a guide member 17 for feeding and guiding the droplet to a droplet generating position Q on the front outer surface of the diverting guide tube 15. An arc spraying device which is screwed and mounted. 2. The arc spraying apparatus according to claim 1, wherein the deflection guide tube and the guide member are formed in a straight line.