JP3001310U - Arc welder with welding wire cleaner and lubricant feeder - Google Patents

Abstract

(57) [Abstract] [Purpose] Cleaning the welding wire of the arc welder to prevent impurities from entering the welding area, and by applying a lubricant to the surface of the wire, smooth the running of the wire, (EN) Provided is an automatic welding machine capable of reducing the cost for welding, improving production efficiency, and improving the quality of welded parts while creating more regular and stable welding conditions. [Structure] A jig is installed in front of the wire drum and pinch roller (3) of the arc welding machine, and the wire wiper (8) and the lubricant container (9) of the welding wire cleaner are attached. Arc welding machine consisting of.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an arc welder equipped with a lubricant feeder for cleaning a welding wire of an arc welder and applying a lubricant.

[0002]

[Prior art]

 Conventionally, especially in an automatic arc welding machine, when the welding machine is operated, the welding wire is sent out and the welding point is reached through the following processes. That is, the welding wire sent from the back-wound wire drum (1) travels inside the conduit tube (4) from the sending position of the drum from (2) via the pinch roller (3). The welding wire coming out of the conduit tube passes through the inside of the welding chip (5), is sent out from the tip of the tip, and contacts the welding location.

Throughout these processes, friction occurs with the welding wire which causes various malfunctions. In particular, the conduit tube that connects between the pinch roller and the welding tip has a spiral spindle structure in which metal wires such as stainless steel wires are spirally wound around it. Since it has a structure made of a relatively hard resin, when using a welding wire whose surface is covered with a coating of copper or the like, the conduit tube The violent movement caused friction of the wire inside the tube, and the coating of copper or the like was peeled off.

This peeled coating fragment sticks into the inner tube inside the conduit tube, and it stays at the joint between the tube and the welding tip due to impurities such as dust and dust, and it becomes even larger. It was a cause of friction. Also, in the case of stainless steel welding wire, friction sometimes occurred, and the traveling of the welding wire sometimes became irregular.

When the welding operation is repeated, a chemical agent called an anti-spatter agent is attached to the tip and the welding torch in order to prevent dirt from adhering to the portion where welding is not required and the side of the welding tip. In this, the welding robot automatically moved the arm (6) based on the program, and moved so as to immerse the tip portion of the arm in the container in which the drug was installed.

Immersion in this anti-spattering agent had to be done for every fixed work, though it was an unavoidable process. This improves the degree of welding and reduces fouling of the weld, but it still had to be done quite often. Although this chemical prevents spatter to some extent, it is not cheap at all, so it did not actively contribute to improving production efficiency and reducing production costs.

[0007]

[Problems to be solved by the device]

 This had the following drawbacks. Dust and dust are easily mixed in places where welding robots are installed, and fine metal powders tend to adhere to the welding wire. Such foreign matter was advanced by the wire, causing friction on the wire. Throughout the entire welding process, friction that causes various malfunctions with the welding wire occurs, but the conduit tube (5) that connects between the pinch roller and the welding tip has stainless steel spirally around it.・ The surface is coated with copper etc. because it has a spiral spindle structure in which metal wires such as wires are wound, or it is made of a relatively hard resin while having flexibility. When using the welded wire, the wire rubs inside the tube due to the violent movement of the conduit tube (4), which is located in front of the pinch roller (3), and the coating of copper or the like is generated. It was peeling off.

[0008] As a result of the peeled pieces of the coating being accumulated and clogged in the tip portion of the inner tube contained in the conduit tube (4), the welding wire was caused to run poorly. In the peeled coating part that passed through the conduit tube (4), it was accumulated inside the welding tip (5) or the inside of the welding tip was scraped off by friction. In particular, in addition to the friction with the welding wire, friction due to the accumulation of such dust and dirt is added to the welded portion of the conduit tube (4) that encloses the welding tip (5) and the inner tube. The speed and rhythm of the wire running was disturbed. Also, when passing through the inside of the tip (5), the wear of the tip (5) sometimes promotes the wear of the tip. Similarly, in the case of stainless steel welding wire, friction was similarly generated, and the traveling of the welding wire sometimes became irregular.

As a result, welding defects often occur at the welding location, the welding wire is not cut at the welding location and seizes, and the welding operation often stops. Even without seizure, the inner diameter of the tip (5), which causes wear, was increased due to wear, resulting in a large inner diameter, which significantly deteriorated the welding accuracy and could adversely affect the quality. Even when the welding wire is not a steel wire coated with copper or the like but a stainless wire, the friction generated when the conduit tube (4) moves at high speed adversely affects the running of the welding wire. Was affecting. A stainless steel wire is generally harder than a welding wire coated with copper or the like and a welding tip. However, wear caused further wear of robot parts.

As a result, the consumable parts have to be replaced frequently, and the profit is reduced due to the loss of time corresponding to the replacement maintenance of the parts. In other words, it costs extra. Replacing consumable parts is not only an issue that is always associated with factory management, such as cost reduction, but it is also necessary to reduce the production efficiency of a factory where robots are installed due to time loss and other factors. It also became.

By the way, when the welding wire is seized due to the reason that the welding wire did not travel at a constant speed during operation of the welding robot, the welding operation is temporarily stopped. Generally, in a factory or work place where a welding robot is installed, when the robot suddenly stops temporarily, the worker in charge of the welding robot process cuts off the burned part of the welding wire. And then had to restart the process from the middle of welding. For workers, restarting the robot from the middle of the robot operation program is a task that requires even more attention, and if the number of installed robots is large, the burden on the worker such as labor and cost is extremely high. It was big.

[0012] The tip of the wire is seized and welded at the welding point, which causes a sudden stop of the automatic welding work or causes the turbulence of droplets or molten pool, which makes the arc length change irregular and unstable. There was an occasion. As a result, the weld bead stretched poorly, undercutting occurred, welding efficiency deteriorated, and the quality of the welded part deteriorated.

Dust and dust mixed in due to peeled coating fragments and work environment not only affect smooth running of wires and affect operating conditions, but also when one process of welding work is completed. In some cases, a sphere of molten wire was left on the tip of the wire. If the tip of the welding wire was like this during restarting, the arc length of the welding robot current was irregular and unstable, and restarting could not be performed smoothly. Therefore, temporary work on the work line is likely to be stopped or interrupted, which makes working conditions difficult when performing multiple welding operations at the same time.

Further, a large amount of spatter is apt to occur because the arc length of the electric current becomes irregular and unstable, and peeling coating, mixing of dust, dust and the like and friction cause. The spatter that is generated scatters, and not only the tip (10) and torch (6), but when it reaches the welded part, the appearance of the part is damaged and the quality deteriorates. It had to be devoted to cleaning and maintenance, which reduced production efficiency and increased production costs.

Since the generation of spatter is not preferable in terms of work and quality, in order to suppress the generation of spatter, a high-priced chemical for spatter prevention is applied to the torch and the tip in a certain welding cycle. I wore it. For this reason, this process, together with the cost of the anti-spatter agent, has been one of the negative factors that suppress the improvement in production efficiency.

Since the welding conditions are not constant as described above, it is difficult to increase the welding speed. Since the work speed is slow, the welding points are affected by irregular and unstable heat, and the welding wire and the parts to be welded are composed of materials such as stainless steel that are easily affected by thermal changes. In this case, it had quality and technical problems such as difficulty in making the metal structure uniform. Also, because of the slow work speed, the gas and electricity consumption required for welding is high, and this is not a good thing for manufacturers who thoroughly pursue cost reduction and profitability. The present invention has been devised to solve these drawbacks and problems.

[0017]

[Means for Solving the Problems]

 In front of the pinch roller (3) located on the running line of the welding wire, attach the wire wiper (8) and the lubricant container (9) that clean the wire with the jig (7), and gradually add the lubricant. Secure so that it is applied to the wire. For the same purpose, the position where the lubricant container is attached may be at the mouth of the drum (2) from which the wire of the back-wound wire drum is fed, as long as it is before the pinch roller. The present invention is an arc welder with a welding wire cleaner and a lubricant feeder for cleaning the welding wire of the automatic arc welder having the above-described configuration.

[0018]

[Operation] When the cleaning tool for the welding wire and the lubricant feeder configured as described above are attached and the automatic arc welding machine is operated, dust and dirt attached to the wire sent from the back-wound wire drum are removed. The dust is removed by the wire wiper of the cleaning tool, and then the lubricant is supplied from the lubricant container, and the felt portion touches the traveling welding wire. When the lubricant is supplied from the container containing the lubricant, the dust and dust removed wire lubricant is applied to the cleaned wire, and the running of the wire causes the conduit tube and inner tube to move. The lubricant is evenly distributed and carried to the inside of the weld, the torch, and the inside of the weld tip, and functions to make the wire run more smoothly.

[0019]

First Embodiment An embodiment of the present invention will be described below. (A) The pinch of the welding robot body so that the wire wiper (8) and the lubricant container (9) can be installed in front of the pinch roller (3) that sends out the wire on the running line of the welding wire.・ Attach the jig (7) to the mount (10) where the roller is attached.

(B) Attach the wire wiper (8) for cleaning the wire to the part extended from a part of the jig (7). For the wire wiper, attach the felt to the tip of the jig, make a notch in the tip of the felt, run the wiper in the valley, touch the wire lightly so as not to burden the running, and slightly wipe the lubricant. Secure as applied to the wire on.

(C) Similarly, the container (9) of the lubricant is attached to the jig (7). The felt is inserted into the tip of the container containing the liquid lubricant, and the liquid lubricant seeps out due to the capillary phenomenon of the felt.

As a result, a lubricant is applied to the wire from which dust and dust have been removed, and the wire slightly moistened with the lubricant is used for the pinch roller (3), conduit tube (4), inner tube, and welding. By passing through the inside of the tip (5), the lubricant diffuses throughout and becomes more widely spread. The present invention is an arc welding machine having a welding wire cleaner and a lubricant feeder having the above-mentioned configuration.

[0023]

[Second Embodiment] Explaining the felt of the wire wiper for cleaning and the position where the lubricant is supplied, the position where the wire wiper and the lubricant are installed is on the running line of the welding wire. Not limited. It can also be installed between the back-wound wire drum (1) and the pinch roller (3).

For example, as shown in FIG. 4, the jig (11) is attached to the wire wiper (12) on the part (2) of the back winding wire drum (1) where the wire comes out, Alternatively, the lubricant (13) may be attached to the jig (11) so that when the wire is sent out from the drum (1), the wire is cleaned and the lubricant is applied.

Further, if the wire wiper and the jig for the lubricant are on the running line of the wire, the wire wiper is located at the mouth portion (2) of the drum, and the position where the lubricant is supplied is set at the pinch roller. They may be separated from each other independently, such as before (3). These methods can be applied not only to automatic arc welding robots but also to various types of welding machines such as semi-automatic welding machines, manual welding machines, brazing welding machines, etc., if wires are used for welding. it can.

[0026]

[Application example]

 By the way, the wire wipers (8) and (12) are not limited to felt, and may be brushes, cloths, strings or papers. Further, the lubricant is not limited to a liquid, and may have a gel-like property or a solid. For example, oil, oil additive, liquid soap, liquid wax, liquid chemical, grease, wax, bar soap, solid wax, etc. can be used for any type of lubricant, but in the case of gel or solid lubricant, wire such as felt can be used. -Instead of the wiper, the lubricant may be fixed so that it is directly applied.

With the above-described structure, when the welding machine operates, the traveling wire touches the felt like licking the felt, so that dust and dirt are removed and the felt seeps out the lubricant due to the capillary phenomenon. The wire starts to run smoothly. The present invention is an automatic arc welder having a lubricant supply device for cleaning the welding wire of the automatic arc welder having the above-described structure and applying the lubricant.

[0028]

[Effect of device]

 The action of the wire wiper that cleans foreign matter such as dust and dirt attached to the welding wire cleans the wire and prevents foreign matter from being sent to the front, reducing friction. Further, although these foreign matters are one of the causes of the generation of spatter, since the contamination of the foreign matter itself is reduced, the spatter can be reduced.

As the lubricant is diffused by the wire, the friction that occurs in the conduit tube and inner tube is reduced and the wire travels more smoothly. This reduces wear on the conduit tube and inner tube. Also, the friction generated on the pinch roller is reduced, so that the life of the pinch roller itself is extended.

The flexible conduit tube that connects between the pinch roller and the welding tip and the inner tube inside it are linked to the arm of the robot that moves at high speed, so that large friction is reduced and these The life of parts is extended. Not only that, but also because the welding wire can travel more smoothly, even if a wire with a copper surface coating is used, the surface will peel off and become flaky, or tube It will drastically reduce the friction of the wire running rhythm due to the high friction caused by sticking to the.

Since the traveling speed and the rhythm of the welding wire are constantly stabilized, the arc length of the current required by the robot for welding is stable, and the welding quality accuracy is improved. In addition, the more stable arc length reduces the sticking of the tip of the welding wire to the welded part. As a result, workers are freed from the difficulty of separating the burned-in part and restarting it.

The weld tip also has a reduced wear on the inside due to the lubricant, and the size of the inside diameter does not change so much. Therefore, since welding can be performed appropriately at an appropriate place, the welding accuracy does not suddenly deteriorate with time. Of course, the wear on the inside of the chip is reduced, which greatly contributes to the reduction of the cost and time loss of consumables resulting from chip replacement.

Since the friction is reduced and the welding wire travels smoothly, the tip of the wire is less likely to seize at the welding point. It also helps to stabilize and regularize changes in arc length, so the weld bead elongation is also desirable and undercutting does not occur. Therefore, the welding efficiency is improved and the quality of the welded portion is improved.

As described above, foreign matter such as dust, dust, and fine metal powder is not mixed in during welding, the arc length is stabilized, and the welding conditions of the automatic welding machine are improved. In some cases, no spherical molten pool is formed at the tip of the wire. As a result, the arc length of the electric current is further stabilized even when restarted, and the time and effort to enter the work are eliminated.

By the action of the wire wiper, which is a cleaning tool for the wire, it is possible to suppress the mixing of foreign matter, the wire traveling speed and rhythm are constantly stabilized, and the arc length of the current is regularly stabilized. Due to the synergistic effects such as the above, the occurrence of spatter can be significantly suppressed.

Even if spatter is generated, the amount of spatter is significantly reduced, and the size of the sputter particles is relatively small. In addition, even if scattered spatter adheres, foreign matter can be removed more easily because the amount of foreign matter is extremely small. Therefore, the number of times and time spent for cleaning and maintenance can be reduced, and the production cost can be reduced and at the same time the production efficiency can be improved.

Since the welding condition becomes more preferable in each part of the entire process, the work speed of welding can be increased more than before. Since the welding conditions can be stabilized and the work can be performed while increasing the wire delivery speed, the portion of the workpiece to be contacted with the wire is affected by less heat. Therefore, since the welding is performed quickly with a small amount of heat, the influence of heat change at the welded portion is small. In other words, even if the parts to be welded are made of metal such as stainless steel, which is easily affected by thermal changes, the metal structure of the welded part is likely to be uniform, and quality such as appearance and strength can be improved. You can do it.

Since the welding work can be performed faster with the same energy consumption, the consumption of carbon dioxide, argon gas, carbon dioxide-argon mixed gas, etc. necessary to bring about a reduction operation during welding is small. It's done.

From the viewpoint of reducing the consumption, the consumption cost of electric energy, the consumption of welding wire, the consumption of welding tip, the consumption of flexible conduit tube and inner tube, the prevention of spatter It is recognized that the amount of drug consumption, etc. decreases.

From the viewpoint of cost reduction in a wider range, the following merits are also recognized. That is, rather than directly reducing the cost by simply reducing the amount of consumables used, the time required to replace consumable parts frequently, the welding of wires, the molten pool at the tip of the wire, or the scattering of spatter When the time required to solve the problem of polishing adhered spatters and removing them is converted into a cost, the cost that can be saved is greater than the cost that can be calculated directly for consumables.

The effects described above act synergistically to reduce the cost and improve the production efficiency, and at the same time, improve the quality of the parts to be welded by the automatic arc welding. .

[Brief description of drawings]

1 is a panoramic side view of an automatic arc welding robot equipped with the present invention.

FIG. 2 is an enlarged side view of the most fundamentally important part of the present invention.

FIG. 3 is an enlarged top view of the most fundamentally important part of the present invention.

FIG. 4 is a perspective view showing another embodiment of the present invention.

[Explanation of symbols] 1 Back winding wire drum 2 Welding wire feeding port 3 Pinch roller 4 Flexible conduit tube 5 Welding tip 6 Welding torch 7 Jig 8 Wire cleaner (wire wiper) 9 Lubricant (container) 10 mount 11 jig 12 wire wiper 13 lubricant (container)

Claims (2)

[Scope of utility model registration request] 1. An arc welding machine equipped with a cleaning tool for cleaning traveling welding wire with a jig. 2. An arc welder equipped with a lubricant feeder for applying a lubricant to a welding wire.