JPH0416260A - Arc flame spraying apparatus - Google Patents

Abstract

PURPOSE:To simplify the step replacement at the time of the alteration of 8 wire material by supplying the wire material 968 by the first guide pipe deflecting, and by guiding the wire material to supply a current and the second guide pipe guiding the wire material to a molten droplet generating position and making the mounting Position of the first guide pipe alterable before and behind, CONSTITUTION:A wire material feed mechanism 2 is received in a case l to feed a pair of wire materials W, forwardly from the case, and the first guide pipe 32 deflects and guides the wire materials W fed out of the wire material feed mechanism 2 to supply an arc current to the wire materials W. Further, the second guide pipe 33 feeds and guides the wire materials W fed out of the first guide pipe 32 to the molten droplet generating position 0, provided to the front outer surface of the case l, and the first guide pipe 32 is mounted so as to be made alterable in its before and behind position along the center axis thereof with respect to an object 34 to be mounted. As a result, the common use of the current collecting guide pipe can be realized and the step replacement accompanied by the operation of an arc flame spraying aparatus, and the alteration of the wire materials to be used can be simplified and the productivity of flame spraying work can be enhanced.

Description

[Detailed description of the invention] (a) Industrial application field The present invention relates to an arc thermal spraying device that performs thermal spraying while forcibly feeding a pair of thermal spraying wires, and is an improved wire rod (hot material) feeding form. It is.

(B) Conventional technology The basic equipment configuration of this type of arc thermal spraying equipment is to forcibly feed a pair of wire rods with a feed roller, and to move the pair of wire rods sent out to a droplet generation position using a guide tube. It is widely used to guide the wire in a direction change direction, to bring the wire into contact with the inner surface of a guide tube during direction change, and to supply an arc current to the wire through the guide tube. For example, JP-A-6
The arc spraying apparatus disclosed in Japanese Patent No. 1-167472 is one of them.

(c) Problems to be Solved by the Invention In the conventional device as described above, for example, when the diameter of the wire used becomes smaller or the wire becomes softer, the arc becomes unstable. , problems such as thermal spraying being interrupted were likely to occur. The causes of arc instability are poor contact between the wire and the guide tube,
One example is the wobbling of the tip of the wire at the droplet generation position, and both can be explained by the "dancing phenomenon" caused by the guide hole diameter being larger than the wire diameter than necessary.

The "dancing phenomenon" occurs when the bent part of the wire moves in the wire feeding direction or to the side that intersects with the feeding direction due to unevenness in the feeding resistance acting on the wire or unevenness in the hardness or shape of the wire itself. This is noticeable when the diameter is large.

In order to avoid such a "dancing phenomenon", the guide hole diameter of the guide tube is set in accordance with the wire diameter. For this reason, with conventional equipment, it is necessary to prepare many types of guide tubes depending on the type of wire rod used, which makes management and operation complicated, and the thermal spraying equipment must be disassembled and guided for each different wire rod used. The pipes had to be replaced, and this setup was troublesome and time-consuming. Therefore, in order to avoid such setup changes, the actual situation was that a special machine had to be manufactured according to the thickness of the wire.

In addition, as a means to eliminate poor contact, the entire guide tube is formed into a gentle curve, but this increases the manufacturing cost of the guide tube and causes problems when the accuracy of the guide tube installation position is low. It was difficult to intersect the ends of the wire at one point, resulting in unstable arcing.

This invention solves the above problems, and by improving the guide tube, it realizes the common use of the guide tube for current collection, and simplifies the operation of the arc thermal spraying equipment and the change of setup due to changes in the wire used. The purpose is to improve the productivity of thermal spraying operations.

Another object of the present invention is to enable a linear guide tube to reliably supply power and guide the droplets to the position where the droplets are generated, and to reduce the manufacturing cost thereof.

(d) Means for Solving the Problems This invention includes a first guide tube 32 that guides the wire W in changing direction and supplies power, and a second guide tube 33 that guides the wire W toward the droplet generation position O. The wire rods are fed by changing the mounting position of the first guide tube 32 back and forth to accommodate differences in the wire rods used.

That is, in this invention, as shown in FIG. 1, a wire rod feeding mechanism 2 is provided, which is housed in a case 1 and feeds a pair of wire rods W toward the front of the case. guides the wire rod W sent out from
The wire rod W fed from the first guide tube 32 is provided with a first guide tube 32 that supplies an arc current to the wire rod W.
The first guide tube 32 is provided with a second guide tube 33 that feeds and guides the droplet to the droplet generation position O on the front outer surface of the tube, and the first guide tube 32 is configured to change its position forward and backward along the tube center axis G with respect to the object 34 to which the first guide tube 32 is attached. It is required that the device be installed so that it can be installed.

(e) Operation The first guide tube 32 is attached to the power supply terminal (attachment target) 34 via, for example, a screw 35, and the attachment position can be changed back and forth by changing the amount of screwing. At this time, the first
The position of the inlet 38 of the guide tube 32 also changes and moves up and down with respect to the central feeding axis F defined by the wire feeding mechanism 2. Normally, the guide tube is attached with the center of the inlet 38 aligned with the feed center axis F, but in the present invention, the position of the inlet 38 is changed depending on the wire diameter.

That is, when the diameter of the guide hole 37 matches the wire diameter, the center of the inlet 38 is made to approximately coincide with the feed center line F, and as the wire diameter becomes smaller, the center of the inlet 38 is adjusted upward and downward. It is positioned above or below the feed center line F. As the position of the inlet 38 deviates from the feed center line F, the degree of bending of the wire W increases, and the wire W is pressed more strongly against the guide hole 37. Therefore, if the diameter of the guide hole 37 is adapted to the maximum wire diameter, the first guide tube 3
By changing the front and rear positions of the wire 2, it is possible to guide the small diameter wire W in changing directions and reliably supply power without causing a "dancing phenomenon".

Note that the second guide tube 33 is replaced according to the wire diameter in order to avoid wobbling of the wire W, but since it is attached to the outer surface of the case, it can be easily replaced.

(v) As described in detail, in this invention, the wire W fed out from the wire feeding mechanism 2 is transferred to both the first and second guide tubes 32.
33, and by changing the attachment position of the first guide tube 32 to the attachment target 34 back and forth, the population 38
By changing the degree of bending of the wire rod W in the vicinity, even if the wire rod diameter is smaller than the diameter of the guide hole 37, the wire rod W can be bent into the guide hole 3.
Made sure to make contact with 7. In other words, the same guiding effect as that achieved by forming the guide hole 37 in a curved manner could be achieved with the straight first guide tube 32.

Therefore, according to the arc thermal spraying apparatus of the present invention, the first guide tube 32, which mainly collects current, can be used as is, and the second guide tube 33, which is easy to replace, can be used to change the wire diameter and hardness. It is now possible to spray a wide variety of wire rods W.
This simplifies the operation of arc spraying equipment and the setup changes associated with changing the wire rod used, and improves the productivity of thermal spraying work.

In addition, since the wire is supplied through both the first and second guide tubes 32 and 33, which are formed in a straight line, the manufacturing cost can be reduced compared to the case where curved guide tubes are used. , the wire rod W can also be fed reliably.

(G) Embodiment FIGS. 1 to 3 show an embodiment of an arc thermal spraying apparatus according to the present invention. In FIG. 1, the arc thermal spraying apparatus performs arc spraying using a wire rod W, and the wire path is set so that the wire rod W passes through a rectangular box-shaped case 1 in a vertically parallel position. A wire feeding mechanism 2 is provided at the center of the interior of the case 1, and a nozzle 3 for spouting compressed air for atomizing is arranged on the outer surface of the front end of the case 1.

In FIG. 2, the interior of the case 1 includes a metal case main body 4 with an opening on the side, an insulating block 5.6 fixed to the front and rear ends of the case main body 4, and an insulating block 5.6 that swings through the opening via a hinge 7. It consists of 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 a closed position by a latch 10, and can be easily opened by sliding the latch 10 against a spring. Furthermore, the bracket 9 can be removed from the insulating block 5 by loosening the screw 12.
This is convenient for replacing the second guide tube 33, which will be described later.

The wire feeding mechanism 2 is disposed between the insulating block 5 on the front side and the inlet guide tube 14 fixed to the insulating block 6 on the rear side, and simultaneously feeds the upper and lower wire rods W toward the front of the case. The wire feeder 11I2 includes a drive roller 18 rotatably supported by the upper and lower walls of the case body 4, a presser roller 19 that presses the wire W against the drive roller 18, a motor 21 that rotationally drives the drive roller 18, and the like. do.

The drive roller 18 is made of an insulator. A metal ring 24 having a V-shaped cross section is fixed to two positions above and below this roller 18, and the wire W is sandwiched between this ring 24 and the presser roller 19 and is forcibly driven to be fed.

To prevent slipping, the metal ring 24 is knurled around the periphery.

The presser roller 19 is also made of an insulator like the drive roller 18, and is arranged one above the other in correspondence with each metal ring 24.

The presser roller 19 is rotatably supported by one end of a spring arm 25, and the drive roller 18 is supported by the elastic force of the spring arm 25.
It is press-fitted and energized. The base end of the spring arm 25 is fixed to the inner surface of the lid 8.

As shown in FIG. 1, the motor 21 is housed in a grip 26 fixed to the bottom surface of the case 1, and is activated when a switch 27 (see FIG. 2) provided on the right outer surface of the case 1 is turned on. .

The nozzle 3 is formed in the shape of a vertically long hollow box, with an oblong guide port 28 provided at the left and right center of its upper half, and a nozzle port 2 on each of the left and right front end walls separated by the port 28.
9 is opened.

30 is a joint for connecting an air hose.

The nozzle ports 29 are formed as vertically long slits, and as shown in FIG. 2, the jet air ejected from each nozzle port 29 is directed so as to merge in front of the droplet generation position O of the wire W. ing.

In order to guide the wire rod W sent out from the wire rod feeding mechanism 2 toward the droplet generation position 0 and to supply an arc current at the time of direction change, a first
- Both second guide tubes 32 and 33 are installed. Both guide tubes 32 and 33 are provided corresponding to the upper and lower wire rods W, and are each fixed to a power supply terminal (attachment target) 34 via a screw 35. Arc current is supplied to the power supply terminal 34 via a cord 36.

The first guide tube 32 consists of a threaded shaft through which a guide hole 37 is passed vertically, and an operating head 3 with a hexagonal cross section is provided on the side of the guide hole 38.
It has 9. 40 is a lock nut, and 41 is a tightening seat. The second guide tube 33 crosses the inside of the guide port 28 of the nozzle 3 back and forth, and is screwed into the power supply terminal 34 with its tip protruding forward of the nozzle 3 . The diameter of the guide hole 37 of the first guide tube 32 is 2 to 2.5 mm.
Further, the guide hole diameter of the second guide tube 33 was set to be 0.1 to 0.2 mm larger than the corresponding wire diameter.

In FIGS. 1 and 2, reference numeral 42 is a Teflon tube, and 43 is a guard frame that blocks arc light.

Next, the necessary procedures for changeover when the wire diameter of the wire rod W becomes smaller will be explained.

First, loosen the screws 12 to separate the bracket 9 from the case body 4 and open the front of the case. In this state, the previously used second guide tube 33 is removed, and a new second guide tube 33 that matches the wire diameter to be used is attached.

Next, open the lid 8 to open the case side, and loosen the upper and lower lock nuts 40. Then, the first guide tube 32 is loosened in accordance with the new wire diameter, and the position of the guide tube 38 is moved along the tube central axis G as indicated by the symbol e, as shown in FIG. The amount of movement at this time can be confirmed with a gauge provided as an accessory or with markings formed on the circumferential surface of the screw shaft. After that, retighten the lock nut 40 and insert a new wire W into both guide tubes 32.
33 and return the N8 and bracket 9 to their original mounting states to complete the replacement work.

As shown in FIG. 3, when the first guide tube 32 is moved to the rear of the case, the center of the population 38 or the drive roller 18
deviates vertically from the feed center line F defined by . An upward shift occurs in the upper first guide tube 32, and a downward shift occurs in the lower first guide tube 32. Therefore, the wire W is bent near the entrance 38 and then guided into the guide 637, and the bent portion contacts the guide hole 37 to collect current.

At this time, the degree of bending is determined by the feed reaction force that the wire W receives from the guide hole 37 and the deformation stress when the wire W receives the feed reaction force and bends, and the wire W is such that these two acting forces are balanced. bend up to. As a tendency, the smaller the wire diameter and the softer the wire, the greater the degree of bending. By bending the wire W, the wire W is more strongly pressed against the kite hole 37. Therefore, even if the diameter of the guide hole 37 is larger than the diameter of the wire, arc current can be reliably supplied and arc spraying can be performed stably.

The present invention provides a first guide pipe 32 having two guide holes 37.
Using this method, we tested various wire rods W with different wire diameters, and arc thermal spraying could be performed stably with all of them. The diameter of the wire W used at this time was 0.9 nin, 1
．． They were 1mm, 1.3mm, and 16mm.

In addition, tests were conducted on wires W made of stainless steel, copper, and zinc of the same diameter (1.1 mm), and the arc did not become unstable.

(H) Another embodiment The first guide tube 32 may be attached to the insulating block 5. In this case, the first guide tube 32 and the power supply terminal 34
Connect them electrically using lead wires, lead plates, etc.

The wire rod feeding mechanism 2 may be configured to feed the upper and lower wire rods W individually.

For attaching the first guide tube 32 to the attachment target, please refer to the fourth guide tube 32.
As shown in the figure, fixing can also be achieved by separately providing a set screw 44, screwing this into the insulating block 5 or the power supply terminal 34, and pressing the peripheral surface of the first guide tube 32 with its tip.

This invention can be applied regardless of the form of jet air supplied by the nozzle 3, so the form of the nozzle 3 is not limited.

[Brief explanation of the drawing]

Figures 1 to 3 show an embodiment of the arc thermal spraying apparatus according to the present invention, Figure 1 is a vertical cross-sectional side view, Figure 2 is a cross-sectional plan view, and Figure 3 is an enlarged view of the main part of Figure 1. It is. FIG. 4 is a longitudinal sectional side view of the main parts of another embodiment. 1... Case, 2... Wire feeding mechanism, 32... First guide tube, 3
3... Second guide tube, 34...
...Installation target, G...Pipe center axis, W.
········wire. Figure 4

Claims (2)

[Claims] (1) A wire rod feed mechanism 2 housed in the case 1 and configured to feed a pair of wire rods W toward the front of the case; and a wire rod feed mechanism 2 that guides the wire rods W sent out from the wire rod feed mechanism 2 to change direction;
The first guide tube 32 supplies arc current to the wire W, and the wire W sent out from the first guide tube 32 is
The first guide tube 32 is provided with a second guide tube 33 that feeds and guides the droplet to the droplet generation position O on the front outer surface of the tube. An arc thermal spraying device characterized in that it can be installed. (2) The arc thermal spraying apparatus according to claim 1, wherein the first guide tube 32 and the second guide tube 33 are formed in a straight line.