JP2003033877A - Welding contact tip - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a welding contact tip which has excellent feedability of a welding wire, excellent power supply property, and high durability, and whose manufacturing cost can be reduced by manufacturing it in the small number of manufacturing processes. SOLUTION: The tip main body 11 has a wire passing through hole 14 of the main body, which penetrates in a longitudinal direction from a front end to a rear end. The wire passing through hole is larger in its diameter at its rear end side than at its front end side. A leaf spring 12 comprises a supporting part 16 and a spring part 16. The supporting part is fit along the inner periphery of the rear end side of the wire passing through hole of the main body. The spring part is formed integrally with the supporting part. The spring part is housed in the rear end side of the wire passing through hole so as to press a welding wire W, which is inserted through the hole, against the inner wall side of the hole. An attaching member 13 is mounted on the tip main body, covering the rear end of the tip main body. The attaching member has a wire passing through hole 19 of a rear part, which is smaller in its diameter than the hole in the rear end side of the wire passing through hole of the main body, on the center line of the wire passing through hole of the main body.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a welding contact tip arranged in a torch nozzle.

[0002]

2. Description of the Related Art As a conventional welding contact tip,
JP-A-9-295151 and JP-A-1-28957.
No. 7, JP-A-8-150479 and JP-A-7-15163. That is, the welding contact tip described in JP-A-9-295151 has a hole for a welding wire at a position eccentric from the center of the wire guide portion on the rear end side, and stabilizes the power feeding portion. . The one disclosed in Japanese Patent Application Laid-Open No. 1-289577 stabilizes the power feeding portion by using a contactor that comes into contact with the welding wire. The one described in Japanese Patent Application Laid-Open No. 8-150479 is designed to improve the power feeding effect by pressing a sleeve having a welding wire passed through a hole with an elastic body. The one disclosed in Japanese Utility Model Laid-Open No. 7-15163 is designed so that the welding wire is deflected by a push screw through an insertion tube to reliably feed power.

[0003]

SUMMARY OF THE INVENTION The present invention has a structure different from that of a conventional welding contact tip, and has a good welding wire feeding and feeding ability and high durability, and is manufactured by a small number of manufacturing steps. It is an object of the present invention to provide a contact tip for welding which can reduce the cost.

[0004]

In order to achieve the above object, a welding contact tip according to the present invention of claim 1 has a tip body, a leaf spring, and a member for attaching to a welding wire feeding portion. , The chip body has a body wire through-hole penetrating in the length direction from the front end to the rear end, the body wire through-hole is thicker on the rear end side than on the front end side,
The leaf spring includes a holding portion and a spring portion, the holding portion is attached along an inner circumference of the rear end side of the main body wire through hole, and the spring portion is integrally provided on the holding portion. The welding wire penetrating the body wire through hole is housed at the rear end side of the body wire through hole so as to press the inner wall side of the body wire through hole, and the mounting member covers the rear end of the chip body. It is characterized in that it is attached to a chip body and has a rear wire through hole thinner than a rear end side of the body wire through hole on a center line of the body wire through hole.

A welding contact tip according to the present invention of claim 1 is arranged inside a torch nozzle, an attaching member is attached to a welding wire power feeding portion, and a welding wire is inserted into a rear wire through hole and a body wire through hole. Used. The welding wire is pressed to the inner wall side by the leaf spring at the rear end side of the main body wire through hole and contacts the inner wall at the boundary with the thin front end side of the main body wire through hole. At this time, the welding wire is supplied with electric power and melted by the arc so that welding can be performed.

Even when wear of the inner wall in contact with the welding wire progresses, since the welding wire is pressed toward the inner wall by the leaf spring, the welding wire comes into contact with the inner wall at the boundary with the thin tip side of the body wire through hole, Stable power feeding is performed without being affected by the feeding ability. Therefore, the welding contact tip according to the present invention of claim 1 has good welding wire feeding and feeding characteristics and high durability, and the arc is stable, resulting in a good welding result. When the arc is stabilized, sputter particles are reduced in size, and the amount of generation is also reduced.

The welding contact tip according to the present invention of claim 1 can be manufactured by making the rear end side of the body wire through hole thicker than the front end side and accommodating the leaf spring at the rear end side. It is possible to reduce the manufacturing cost by manufacturing with a small number of manufacturing steps.

In the contact tip for welding according to the first aspect of the present invention, since the mounting member covers the rear end of the tip body, the leaf spring can be prevented from slipping out from the rear end of the tip body. Since the chip body accommodates the leaf spring, the rear end side of the body wire through hole is thicker than the front end side. Therefore, if the rear end of the tip body is to be attached to the welding wire power feeding portion, the thickness of the rear end of the tip body becomes thin and the strength becomes weak. However, in the welding contact tip according to the present invention of claim 1, since it is attached to the welding wire power feed portion by the attachment member, the strength of the attachment portion to the welding wire power feed portion can be increased.

In the welding contact tip according to the present invention of claim 1, the leaf spring may have a groove for guiding a welding wire penetrating the body wire through hole. In this case, since the welding wire is stably fed along the groove without being displaced inside the body wire through hole, the arc can be stabilized and the weldability can be improved.

In the welding contact tip according to the present invention of claim 1, in addition to chromium copper, the tip body is made of brass, pure copper, zirconium copper, brass, aluminum, phosphor bronze, conductive ceramic, beryllium copper or the like. Can be used for. The leaf spring may be detachably accommodated on the rear end side of the body wire through hole, and the attachment member may be detachably attached to the chip body. In this case, the wear degree of the chip body can be adjusted by replacing with a leaf spring having a different plate thickness, length, width, material, elasticity, etc. according to the application.

A welding contact tip according to a second aspect of the present invention is the welding contact tip according to the first aspect, which has a wear-resistant member, and the wear-resistant member has electrical conductivity and is more resistant than the tip body. It has a large degree of wear, is inserted into the tip side of the body wire through-hole, and has a front wire through-hole on the center line of the body wire through-hole.

In the welding contact tip according to the second aspect of the present invention, the welding wire is contacted with the wear resistant member having a higher wear resistance than the tip body to supply power. Therefore, the durability is high.

According to a third aspect of the present invention, there is provided a welding contact tip according to the second aspect, wherein the wear-resistant member has a concave portion on an outer periphery located inside the mounting member, Is fixed to the chip body by caulking, and the wear-resistant member is characterized in that the chip body deformed by caulking the mounting member is engaged with the concave portion to be prevented from coming off.

In the welding contact tip according to the present invention of claim 3, when fixing the mounting member to the tip body,
At the same time, the wear resistant member can be prevented from coming off from the chip body, so that the chip body can be manufactured by a small number of manufacturing steps.

A welding contact tip according to a fourth aspect of the present invention is the welding contact tip according to the first aspect, which has a tip end member and a wear-resistant member, wherein the tip end member is formed of the body wire through hole. A tip tip wire through hole is provided on the center line, the tip of the tip body is covered and attached to the tip body, and the abrasion resistant member has a greater degree of abrasion resistance than the tip body. It is characterized in that it is provided so as to be covered with a member and has a front wire through hole on the center line of the main body wire through hole.

In the welding contact tip according to the present invention of claim 4, since the wear resistant member having a greater wear resistance than the tip body is provided on the tip side of the tip body, the durability is high. Since the wear-resistant member is covered by the tip member, the tip member is made of a material that is more resistant to deterioration due to radiant heat and spatter than the wear-resistant member. It can protect from deterioration and improve durability.

A welding contact tip according to a fifth aspect of the present invention has a tip body, a wear resistant member, a mounting member for a welding wire power feeding portion, and a leaf spring, and the tip body extends from the front end to the rear end. Has a body wire through-hole penetrating in the length direction, the wear-resistant member has a greater degree of wear resistance than the chip body, is inserted into the tip side of the body wire-through hole, and is on the center line of the body wire-through hole. Has a front wire through hole, the mounting member is electrically conductive and has greater strength than the chip body, is inserted into the rear end side of the body wire through hole and protrudes from the rear end of the chip body, A rear wire through hole is provided on a center line of the main body wire through hole, the rear wire through hole has a rear end side thicker than a front end side, and the leaf spring includes a holding portion and a spring portion. After the above Attached along the inner circumference of the rear end side of the wire through hole, the spring part is integrally provided on the holding part, and a welding wire penetrating the rear wire through hole is attached to the inner wall side of the rear wire through hole. It is characterized in that it is accommodated on the rear end side of the rear wire through hole so as to be pressed.

A welding contact tip according to a fifth aspect of the present invention is arranged inside a torch nozzle, a mounting member is attached to a welding wire power feeding portion, and a welding wire is inserted into a front wire through hole and a rear wire through hole. To be used. The welding wire is pressed to the inner wall side by the leaf spring at the rear end side of the rear wire through hole, and contacts the inner wall at the boundary with the thin front end side of the rear wire through hole. At this time, the welding wire is supplied with electric power and melted by the arc so that welding can be performed.

Even when wear of the inner wall in contact with the welding wire progresses, since the welding wire is pressed toward the inner wall side by the leaf spring, the welding wire comes into contact with the inner wall at the boundary with the thin tip side of the rear wire through hole, Stable power feeding is performed without being affected by the feeding ability. Therefore, in the welding contact tip according to the present invention of claim 5, the welding wire feedability and power feeding ability are good, the durability is high, and the arc is stable, so that the welding result is good. When the arc is stabilized, sputter particles are reduced in size, and the amount of generation is also reduced.

The welding contact tip according to the present invention of claim 5 can be manufactured by making the rear end side of the rear wire through hole thicker than the front end side and accommodating the leaf spring at the rear end side. It is possible to reduce the manufacturing cost by manufacturing with a small number of manufacturing steps.

In the welding contact tip according to the present invention of claim 5, since it is attached to the welding wire feeding portion by a mounting member having a strength higher than that of the tip body, the strength of the attaching portion to the welding wire feeding portion is increased. You can Further, since the abrasion resistant member has a greater degree of abrasion resistance than the chip body, it has high durability.

In the welding contact tip according to the present invention of claim 5, the leaf spring may have a groove for guiding a welding wire penetrating the wire through hole. In this case, since the welding wire is stably fed along the groove without being displaced inside the rear wire through hole, the arc can be stabilized and the weldability can be improved.

In the welding contact tip according to the present invention of claim 5, the tip body is made of brass, pure copper, zirconium copper, brass, aluminum, phosphor bronze, conductive ceramics, beryllium copper, etc. in addition to chromium copper. Can be used for. The leaf spring may be detachably accommodated on the rear end side of the rear wire through hole. In this case, the wear degree of the mounting member can be adjusted by replacing with a leaf spring having a different plate thickness, length, width, material, elasticity, etc. according to the application.

According to a sixth aspect of the present invention, there is provided a welding contact tip according to the second, third or fifth aspect, wherein the tip body and the wear resistant member penetrate the front wire through hole. It is characterized by being composed of metals that are welded to each other by arc discharge with a welding wire.

In the welding contact tip according to the sixth aspect of the present invention, the tip body and the wear-resistant member can be welded to each other by arc discharge with the welding wire, and therefore can be manufactured with a small number of manufacturing steps.

A welding contact tip according to a seventh aspect of the present invention is the welding contact tip according to the second, third, fifth or sixth aspect, wherein the tip has a wear resistant member, and the tip wear resistant member has the wear resistant member. The wear resistance is higher than that of the member, the wear resistance wire through hole is inserted into the body wire through hole on the tip side of the wear resistance member, and the wear resistance wire through hole is provided on the center line of the body wire through hole. It is characterized in that the tip of the wear member is covered to have a tip wire through hole at the tip on the center line of the wear resistant wire through hole.

In the welding contact tip according to the present invention of claim 7, since the tip wear resistant member having a greater degree of wear resistance than the wear resistant member is provided on the tip side of the wear resistant member, the durability is high. The tip wear-resistant member has its tip covered with the tip body, so by using a material that is more resistant to radiation heat and deterioration due to spatter than the tip wear-resistant member to the tip body material, It is possible to protect from deterioration due to sputtering and improve durability.

A welding contact tip according to the present invention of claim 8 has a tip body, a leaf spring, a tip end member and an abrasion resistant member, and the tip body penetrates in the length direction from the front end to the rear end. A body wire through-hole, the body wire through-hole is thicker on the rear end side than on the front end side,
The leaf spring includes a holding portion and a spring portion, the holding portion is attached along an inner circumference of the rear end side of the main body wire through hole, and the spring portion is integrally provided on the holding portion. The tip of the tip member is housed on the rear end side of the body wire through hole so as to press the welding wire passing through the body wire through hole toward the inner wall side of the body wire through hole, and the tip tip member is located on the center line of the body wire through hole. It has a tip wire through hole and covers the tip of the chip body and is attached to the chip body. The abrasion resistant member has a greater degree of abrasion resistance than the chip body, and is between the chip body and the chip tip member. And has a front wire through hole on the center line of the main body wire through hole.

A welding contact tip according to the present invention of claim 8 is arranged inside a torch nozzle, a tip body is attached to a welding wire power feeding portion, and a welding wire is attached to a body wire through hole, a front wire through hole and a tip. It is used by inserting it into the tip wire through hole. The welding wire is pressed to the inner wall side by the leaf spring at the rear end side of the main body wire through hole and contacts the inner wall at the boundary with the thin front end side of the main body wire through hole. At this time, the welding wire is supplied with electric power and melted by the arc so that welding can be performed.

Even when wear of the inner wall in contact with the welding wire progresses, since the welding wire is pressed toward the inner wall by the leaf spring, the welding wire comes into contact with the inner wall at the boundary with the thin tip side of the body wire through hole, Stable power feeding is performed without being affected by the feeding ability. Therefore, the welding contact tip according to the present invention of claim 8 has good welding wire feeding and feeding characteristics and high durability, and the arc is stable, resulting in a good welding result. When the arc is stabilized, sputter particles are reduced in size, and the amount of generation is also reduced.

The welding contact tip according to the present invention of claim 8 can be manufactured by making the rear end side of the main body wire through hole thicker than the front end side and accommodating the leaf spring at the rear end side. It is possible to reduce the manufacturing cost by manufacturing with a small number of manufacturing steps.

In the welding contact tip according to the present invention of claim 8, since the wear resistant member having a greater wear resistance than the tip body is provided on the tip side of the tip body, the durability is high. Since the wear-resistant member is covered by the tip member, the tip member is made of a material that is more resistant to deterioration due to radiant heat and spatter than the wear-resistant member. It can protect from deterioration and improve durability.

In the welding tip according to the present invention of claim 8, the leaf spring may have a groove for guiding a welding wire penetrating the body wire through hole. In this case, since the welding wire is stably fed along the groove without being displaced inside the body wire through hole, the arc can be stabilized and the weldability can be improved.

In the welding contact tip according to the present invention of claim 8, the tip body is made of brass, pure copper, zirconium copper, brass, aluminum, phosphor bronze, conductive ceramics, beryllium copper, etc. in addition to chromium copper. Can be used for. The leaf spring may be detachably accommodated on the rear end side of the body wire through hole. In this case, the wear degree of the chip body can be adjusted by replacing with a leaf spring having a different plate thickness, length, width, material, elasticity, etc. according to the application.

[0035]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First to eighth embodiments of the present invention will be described below with reference to the drawings. 1 and 2 show a first embodiment of the present invention. Figure 1
As shown in FIG. 1, the welding contact tip 1 is composed of a tip body 11, a leaf spring 12, and a mounting member 13 for attaching to a welding wire power feeding portion (torch joint).

The chip body 11 has a cylindrical shape, and a body wire through hole 14 penetrating in the length direction from the front end to the rear end.
Have. The body wire through hole 14 has the same center line as the center line of the chip body 11. The front end side 14a of the main body wire through hole 14 is cylindrical and has a diameter adapted to the thickness of the welding wire W. Body wire through hole 1
The rear end side 14b of No. 4 is cylindrical and thicker than the front end side 14a. Rear end side 14b of the body wire through hole 14
Is inclined so that the inner wall 14c near the tip side 14a gradually becomes thinner toward the tip side. The tip body 11 is inclined in a conical shape so that the tip-side outer circumference 11a becomes narrower toward the tip, and the rear-end-side outer circumference 11b forms a step with respect to the tip-side outer circumference 11a to form a cylindrical shape. A male screw portion 11c is formed on the outer periphery 11b on the rear end side.

As shown in FIG. 2, the leaf spring 12 comprises a holding portion 15 and a spring portion 16. The holding portion 15 has a shape in which a part of the ring is cut out in a zigzag shape, and has a diameter slightly larger than the inner diameter of the rear end side 14 b of the body wire through hole 14. The holding portion 15 has elasticity, spreads along the inner periphery of the rear end side 14 b of the body wire through hole 14, and is elastically attached. The spring portion 16 is the holding portion 15
It is provided integrally with. The spring portion 16 has an elongated plate shape, bends from the vicinity of the holding portion 15, and has a tip end at the holding portion 15.
Extends to a position beyond the center line of.

The tip of the spring portion 16 is curved so that both sides 16a of the tip protrude, and has a U-shaped cross section. As a result, the spring portion 16 has a groove 16b inside along the length direction. In the leaf spring 12, the spring portion 16 is inserted from the rear end 11d of the chip body 11 into the rear end side 14b of the main body wire through hole 14, and the holding portion 15 is inserted into the rear end side 1 of the main body wire through hole 14.
By being attached to the inner periphery of 4b, it is housed in the rear end side 14b of the body wire through hole 14. At this time, the leaf spring 1
2 is disposed across the extension of the main body wire through hole 14 so that the spring portion 16 presses the welding wire W penetrating the main body wire through hole 14 toward the inner wall side of the main body wire through hole 14.

The mounting member 13 is tubular and integrally has a thick cylindrical portion 17 on the front end side and a thin cylindrical portion 18 on the rear end side. Thick cylindrical portion 17 and thin cylindrical portion 18
Have the same centerline. The thick cylindrical portion 17 has a female screw portion 17a formed therein which is screwed into the male screw portion 11c of the chip body 11. The thick cylindrical portion 17 covers the rear end side outer periphery 11b of the chip body 11, and the male screw portion 11c.
Is attached to the chip body 11 by being screwed onto the female screw portion 17a. On the outer periphery of the thin cylindrical portion 18, a male thread portion for attachment that can be screwed with a female thread portion (not shown) of the welding wire power feeding portion is formed. The attachment member 13 has a rear wire through hole 19 which is thinner than the rear end side 14 b of the main body wire through hole 14 on the center line of the main body wire through hole 14. The rear wire through hole 19 is cylindrical and has the same center line as the center line of the chip body 11.

Next, the operation will be described. The welding contact tip 1 is disposed inside the torch nozzle, and is used by attaching the attachment member 13 to the welding wire power feeding portion and inserting the welding wire W into the rear wire through hole 19 and the main body wire through hole 14. The welding wire W is pressed to the inner wall side by the leaf spring 12 at the rear end side 14b of the main body wire through hole 14, and the thin tip side 1 of the main body wire through hole 14 is pressed.
It contacts the inner wall at the boundary 14d with 4a. At this time, the welding wire W is supplied with electric power and melted by the arc so that welding can be performed.

Even when wear of the inner wall in contact with the welding wire W progresses, the welding wire W is pressed toward the inner wall by the leaf spring 12, so that the thin tip side 1 of the main body wire through hole 14
It contacts the inner wall at the boundary 14d with 4a, and stable power feeding is performed without being affected by the feeding ability. For this reason, the welding contact tip 1 has good welding wire W feeding and feeding characteristics and high durability, and the arc is stable, so that the welding result is good. The arc is stable even if the tip of the body wire through hole 14 is enlarged. When the arc is stabilized, sputter particles are reduced in size, and the amount of generation is also reduced. The contact tip 1 for welding has a body wire through hole 1
Since it can be manufactured by making the rear end side 14b of No. 4 thicker than the front end side 14a and housing the leaf spring 12 in the rear end side 14b, the manufacturing cost can be reduced by manufacturing with a small number of manufacturing steps.

In the welding contact tip 1, since the mounting member 13 covers the rear end of the tip body 11, the leaf spring 12 can be prevented from slipping out from the rear end of the tip body 11. By the way, the chip body 11 has a leaf spring 12
Rear end side 14b for accommodating
Is thicker than the tip side 14a. Therefore, if the rear end of the tip body 11 is to be attached to the welding wire power feeding portion, the thickness of the rear end of the tip body 11 will be thin and the strength will be weakened. However, since the welding contact tip 1 is attached to the welding wire power feed portion by the attachment member 13, the strength of the attachment portion to the welding wire power feed portion can be increased by forming the cylindrical portion 18 to be thick.

Next, a second embodiment of the present invention will be described. FIG. 3 shows a second embodiment of the present invention. As shown in FIG. 3, the contact tip 2 for welding
Has an abrasion resistant member 21. The wear resistant member 21 has electrical conductivity and has a higher wear resistance than the chip body 11. The wear resistant member 21 is inserted into the tip end side 14 a of the body wire through hole 14. The wear-resistant member 21 has a body wire through hole 14
Has a front wire through hole 22 penetrating on the center line of the.
The front wire through-hole 22 has a cylindrical shape and has a chip body 1
It has the same center line as that of 1. The other structure of the contact tip 2 for welding is the same as that of the contact tip 1 for welding of 1st Embodiment mentioned above, The same code | symbol is attached | subjected to the same member and the overlapping description is abbreviate | omitted. .

Next, the operation will be described. In the welding contact tip 2, the welding wire W is connected to the tip body 11
Power is supplied by contacting the wear resistant member 21 having a higher wear resistance. Therefore, the durability is high. The other actions and effects of the welding contact tip 2 are the same as the actions and effects of the welding contact tip 1 of the first embodiment described above, and a duplicate description will be omitted.

Next, a third embodiment of the present invention will be described. FIG. 4 shows a third embodiment of the present invention. As shown in FIG. 4, in the welding contact tip 3, the wear resistant member 21 has a recess 31 on the outer periphery located inside the mounting member 13. The mounting member 13 is fixed to the chip body 11 by caulking. The wear resistant member 21 is
Chip body 11 deformed by caulking mounting member 13
Engages with the recess 31 and is prevented from coming off. The other configuration of the welding contact tip 3 is the same as the configuration of the welding contact tip 2 of the above-described second embodiment, the same members are denoted by the same reference numerals, and redundant description will be omitted. .

Next, the operation will be described. In the welding contact tip 3, the attachment member 13 is attached to the tip body 11
Since the wear resistant member 21 can be prevented from coming off from the chip body 11 at the same time when it is fixed to the chip body 11, the manufacturing can be performed with a small number of manufacturing steps. The other actions and effects of the welding contact tip 3 are the same as the actions and effects of the welding contact tip 2 of the second embodiment described above, and a duplicate description will be omitted.

Next, a fourth embodiment of the present invention will be described. FIG. 5 shows a fourth embodiment of the present invention. As shown in FIG. 5, the contact tip 4 for welding
Has a tip end member 41 and a wear resistant member 42.
The tip tip member 41 has a tip tip wire through hole 43 on the center line of the body wire through hole 14, and
1 is covered and attached to the chip body 11.
The abrasion resistant member 42 has a greater degree of abrasion resistance than the tip body 11, and is provided so as to be covered between the tip body 11 and the tip end member 41. The wear resistant member 42 has a front wire through hole 44 on the center line of the main body wire through hole 14. Chip tip wire through hole 43 and front wire through hole 44
Is cylindrical and has the same center line as the center line of the chip body 11. The other configuration of the welding contact tip 4 is the same as the configuration of the welding contact tip 1 of the above-described first embodiment, the same members are denoted by the same reference numerals, and overlapping description will be omitted. .

Next, the operation will be described. Since the welding contact tip 4 has the wear resistant member 42 having a higher wear resistance than the tip body 11 on the tip side of the tip body 11, the welding contact tip 4 has high durability. Since the wear-resistant member 42 is covered with the tip end member 41, the wear-resistant member 42 is removed from the welded portion by using a material that is more resistant to deterioration due to radiant heat and spatter than the wear-resistant member 42 for the tip end member 41. It is possible to protect from deterioration due to radiant heat and spatter and improve durability. The other actions and effects of the welding contact tip 4 are the same as the actions and effects of the welding contact tip 1 of the first embodiment described above, and a duplicate description will be omitted.

Next explained is the fifth embodiment of the invention. FIG. 6 shows a fifth embodiment of the present invention. As shown in FIG. 6, the contact tip 5 for welding
Has a tip body 51, a wear resistant member 52, a mounting member 53 for attaching to a welding wire power feeding portion, and a leaf spring 54.

The chip body 51 has a body wire through hole 55 penetrating in the length direction from the front end to the rear end. The body wire through hole 55 has a cylindrical shape and is formed in the chip body 51.
It has the same centerline as the centerline of. Wear resistant member 52
Has a higher degree of wear resistance than the chip body 51 and is inserted into the tip side 55a of the body wire through hole 55. The wear resistant member 52 has a front wire through hole 56 on the center line of the main body wire through hole 55. The front wire through hole 56 is cylindrical and has the same center line as the center line of the chip body 11. The attachment member 53 has electrical conductivity and is stronger than the chip body 51.

The mounting member 53 has a body wire through hole 55.
It is inserted in the rear end side 55b and protrudes from the rear end of the chip body 51. On the outer periphery of the protruding portion of the mounting member 53, a mounting male screw portion that can be screwed with a female screw portion (not shown) of the welding wire power feeding portion is formed. Mounting member 53
Has a rear wire through hole 57 on the center line of the main body wire through hole 55, and the rear wire through hole 57 has a rear end side 57b thicker than a front end side 57a. Rear wire through hole 5
Reference numeral 7 is cylindrical and has the same center line as the center line of the chip body 11. The leaf spring 54 includes a holding portion 58 and a spring portion 59. The holding portion 58 has the rear wire through hole 5
7 is elastically attached along the inner circumference of the rear end side 57b. The spring portion 59 is provided integrally with the holding portion 58. The spring portion 59 is housed on the rear end side 57b of the rear wire through hole 57 so as to press the welding wire W passing through the rear wire through hole 57 toward the inner wall side of the rear wire through hole 57.

Next, the operation will be described. The welding contact tip 5 is arranged inside the torch nozzle, and is used by attaching the attachment member 53 to the welding wire power feeding portion and inserting the welding wire W into the front wire through hole 56 and the rear wire through hole 57. The welding wire W is pressed to the inner wall side by the leaf spring 54 at the rear end side 57b of the rear wire through hole 57, and the thin tip side 5 of the rear wire through hole 57 is pressed.
The boundary 57c with 7a contacts the inner wall. At this time, the welding wire W is supplied with electric power and melted by the arc so that welding can be performed.

Even when wear of the inner wall in contact with the welding wire W progresses, since the welding wire W is pressed toward the inner wall by the leaf spring 54, the thin tip side 5 of the rear wire through hole 57 is formed.
It contacts the inner wall at the boundary 57c with the 7a, and stable power feeding is performed without being affected by the feedability. For this reason, the welding contact tip 5 has good feedability and power feeding property of the welding wire W and high durability, and the arc is stable, resulting in a good welding result. When the arc is stabilized, sputter particles are reduced in size, and the amount of generation is also reduced. In the welding contact tip 5, the rear end side 57b of the rear wire through hole 57 is made thicker than the front end side 57a, and the rear end side 57
Since it can be manufactured by accommodating the leaf spring 54 in b, the manufacturing cost can be reduced by manufacturing with a small number of manufacturing steps.

Since the welding contact tip 5 is attached to the welding wire power feed portion by the attachment member 53 having a higher strength than the tip body 51, the strength of the attachment portion to the welding wire power feed portion can be increased. Further, since the abrasion resistant member 52 has a greater abrasion resistance than the chip body 51, it has high durability.

In the welding contact tip 5, the tip body 51 and the wear resistant member 52 may be made of a metal which is welded to each other by arc discharge with the welding wire W penetrating the front wire through hole 56. In this case, since the tip body 51 and the wear resistant member 52 can be welded to each other by arc discharge with the welding wire W, the manufacturing can be performed with a small number of manufacturing steps.

Next explained is the sixth embodiment of the invention. FIG. 7 shows a sixth embodiment of the present invention. As shown in FIG. 7, the contact tip 6 for welding
Has a tip wear resistant member 61. Tip wear resistant member 61
Has a greater degree of wear resistance than the wear resistant member 52. The tip wear resistant member 61 is inserted into the body wire through hole 55 on the tip side of the wear resistant member 52. The tip wear-resistant member 61 has the wear-resistant wire through hole 6 on the center line of the body wire through hole 55.
Have two. The wear-resistant wire through hole 62 has a cylindrical shape and has the same center line as the center line of the chip body 51. The tip body 51 covers the tip of the tip wear-resistant member 61. The chip body 51 has a wear resistant wire through hole 6
2 has a tip wire through hole 63 at the tip on the center line.
The tip wire through hole 63 has a cylindrical shape, and
It has the same center line as that of 1. The other configuration of the welding contact tip 6 is the same as the configuration of the welding contact tip of the fifth embodiment described above, the same members are designated by the same reference numerals, and duplicate description will be omitted.

Next, the operation will be described. In the welding contact tip 6, the tip wear resistant member 61, which has a greater wear resistance than the wear resistant member 52, is located on the tip side of the wear resistant member 52.
It has high durability. The tip wear-resistant member 61 is
Since the tip is covered with the tip body 51, the tip body 51 is made of a material that is more resistant to deterioration due to radiant heat and spatter than the tip wear resistant member 61.
It is possible to protect the wear resistant member 52 from deterioration due to radiant heat from the welded portion and spatter and improve durability.
The other actions and effects of the welding contact tip are the same as the actions and effects of the welding contact tip of the fifth embodiment described above, and a duplicate description will be omitted.

As an example of the material of each member of the welding contact tip, the tip body 51 is an alloy of chromium and copper, the mounting member is brass, and the wear resistant member 52 is an alloy of chromium, zinc and copper, and the tip end resistance is The wear member 61 is ceramic or tungsten.

Next explained is the seventh embodiment of the invention. FIG. 8 shows a seventh embodiment of the present invention. As shown in FIG. 8, the contact tip for welding 7
Is a tip body 71, a leaf spring 72, and a tip end member 73.
And an abrasion resistant member 74. The chip body 71 has a body wire through hole 75 penetrating in the length direction from the front end to the rear end. The body wire through hole 75 is formed in the chip body 7.
It has the same center line as that of 1. The rear end side 75b of the main body wire through hole 75 is thicker than the front end side 75a. The rear end side 75b and the front end side 75a each have a cylindrical shape. On the outer periphery of the rear end of the chip body 71,
An attachment male screw portion that can be screwed into a female screw portion (not shown) of the welding wire power feeding portion is formed.

The leaf spring 72 comprises a holding portion 76 and a spring portion 77. The holding portion 76 is elastically attached along the inner circumference of the rear end side 75b of the body wire through hole 75.
The spring portion 77 is provided integrally with the holding portion 76.
The spring portion 77 is housed on the rear end side 75b of the body wire through hole 75 so as to press the welding wire W penetrating the body wire through hole 75 toward the inner wall side of the body wire through hole 75. The tip end member 73 has a tip end wire through hole 78 on the center line of the main body wire through hole 75. The tip tip member 73 covers the tip of the tip body 71 and is attached to the tip body 71. The wear resistant member 74 is
The wear resistance is higher than that of the tip body 71. Abrasion resistant member 74
Are provided between the tip body 71 and the tip member 73. The wear resistant member 74 has a body wire through hole 75.
Has a front wire through hole 79 on its center line.

Next, the operation will be described. The welding contact tip 7 is arranged inside the torch nozzle, the tip body 71 is attached to the welding wire power feeding portion, the welding wire W is attached to the body wire through hole 75, and the front wire through hole 79.
It is also used by inserting it into the tip tip wire through hole 78. The welding wire W is pressed to the inner wall side by the leaf spring 72 at the rear end side 75b of the main body wire through hole 75 and contacts the inner wall at the boundary 75c with the thin front end side 75a of the main body wire through hole 75. At this time, the welding wire W is supplied with electric power and melted by the arc so that welding can be performed.

Even when wear of the inner wall in contact with the welding wire W progresses, since the welding wire W is pressed toward the inner wall side by the leaf spring 72, the thin tip side 7 of the body wire through hole 75 is formed.
It contacts the inner wall at the boundary 75c with the 5a, and stable power feeding is performed without being affected by the feedability. For this reason, the welding contact tip 7 has good feeding and feeding properties of the welding wire W and high durability, and the arc is stable, so that the welding result is good. When the arc is stabilized, sputter particles are reduced in size, and the amount of generation is also reduced. In the welding contact tip 7, the rear end side 75b of the body wire through hole 75 is made thicker than the front end side 75a, and the rear end side 75
Since it can be manufactured by accommodating the leaf spring 72 in b, it can be manufactured by a small number of manufacturing steps and the manufacturing cost can be reduced.

Since the welding contact tip 7 has the abrasion resistant member 74 having a greater degree of abrasion resistance than the tip body 71 on the tip side of the tip body 71, the durability is high. Since the wear-resistant member 74 is covered with the tip end member 73, the wear-resistant member 74 can be removed from the welding location by using a material that is more resistant to deterioration due to radiant heat and spatter than the wear-resistant member 74 as the material of the tip end member 73. It is possible to protect from deterioration due to radiant heat and spatter and improve durability.

Next, an eighth embodiment of the present invention will be described. FIG. 9 shows an eighth embodiment of the present invention. As shown in FIG. 9, contact tip 8 for welding
Has a tip wear resistant member 81. Tip wear resistant member 81
Has a greater degree of wear resistance than the wear resistant member 21. The chip body 82 has a body wire through hole 14 penetrating in the length direction from the front end to the rear end. The tip wear resistant member 81 is inserted into the body wire through hole 14 on the tip side of the wear resistant member 21. The tip wear resistant member 81 has a wear resistant wire through hole 82 on the center line of the main body wire through hole 14. The wear resistant wire through hole 82 has a cylindrical shape and
It has the same center line as that of 1.

The body wire through hole 14 is cylindrical and has the same center line as the center line of the chip body 11.
The tip body 11 covers the tip of the tip wear-resistant member 81. The tip body 11 has a tip wire through hole 83 at the tip on the center line of the wear resistant wire through hole 82. The tip wire through-hole 83 is cylindrical and has the same center line as the center line of the chip body 11. The other structure of the contact tip 8 for welding is the same as that of the contact tip 2 for welding of the above-mentioned 2nd Embodiment, the same code | symbol is attached | subjected to the same member and the overlapping description is abbreviate | omitted. .

Next, the operation will be described. In the welding contact tip 8, a tip wear resistant member 81 having a wear resistance greater than that of the wear resistant member 21 is provided on the tip side of the wear resistant member 21.
It has high durability. The tip wear-resistant member 81 is
Since the tip is covered with the tip body 11, the tip body 11 is made of a material that is more resistant to deterioration due to radiant heat and spatter than the tip wear resistant member 81.
It is possible to protect the wear resistant member 21 from deterioration due to radiant heat from the welded portion and spatter and improve durability.
Other actions and effects of the welding contact tip 8 are the actions and effects of the welding contact tip 2 of the second embodiment described above.
This is the same as the effect, and duplicate explanations are omitted.

[0067]

According to the welding contact tip of the present invention, it is possible to reduce the manufacturing cost by manufacturing the welding wire W with good feeding and power feeding properties and high durability, and with a small number of manufacturing steps. .

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a welding contact tip according to a first embodiment of the present invention.

2 (a) is a front view, FIG. 2 (b) is a side view, and FIG. 2 is a plan view of a leaf spring used in the welding contact tip of FIG.

FIG. 3 is a vertical sectional view of a welding contact tip according to a second embodiment of the present invention.

FIG. 4 is a vertical sectional view of a welding contact tip according to a third embodiment of the present invention.

FIG. 5 is a longitudinal sectional view of a welding contact tip according to a fourth embodiment of the present invention.

FIG. 6 is a vertical cross-sectional view of a welding contact tip according to a fifth embodiment of the present invention.

FIG. 7 is a vertical cross-sectional view of a welding contact tip according to a sixth embodiment of the present invention.

FIG. 8 is a vertical sectional view of a welding contact tip according to a seventh embodiment of the present invention.

FIG. 9 is a vertical sectional view of a welding contact tip according to an eighth embodiment of the present invention.

[Explanation of symbols]

1,2,3,4,5,6,7,8 Welding contact tip 11 Tip body 12 Leaf spring 13 Attachment member for welding wire power feeding portion (torch joint) 14 Body wire through hole 15 Holding portion 16 Spring portion

Claims (8)

[Claims] 1. A tip body, a leaf spring, and a mounting member for attaching to a welding wire power feeding portion, wherein the tip body has a body wire through hole penetrating in a length direction from a front end to a rear end. The wire through hole has a rear end side thicker than the front end side, the leaf spring is composed of a holding portion and a spring portion, and the holding portion is attached along the inner periphery of the rear end side of the main body wire through hole, The spring portion is provided integrally with the holding portion and is accommodated on the rear end side of the main body wire through hole so as to press the welding wire penetrating the main body wire through hole toward the inner wall side of the main body wire through hole, The mounting member covers the rear end of the chip body and is mounted on the chip body, and has a rear wire through hole thinner than the rear end side of the body wire through hole on the center line of the body wire through hole, Features Contact tip for welding. 2. A wear-resistant member, wherein the wear-resistant member is electrically conductive and has a greater wear resistance than the chip body, and is inserted into the tip end side of the body wire through-hole. The contact tip for welding according to claim 1, further comprising a front wire through hole penetrating on a center line of the hole. 3. The wear resistant member has a recess on the outer periphery located inside the mounting member, the mounting member is fixed to the chip body by caulking, and the wear resistant member is deformed by caulking the mounting member. The contact tip for welding according to claim 2, wherein the tip body is engaged with the recess to prevent the tip from coming off. 4. A tip tip member and a wear resistant member, wherein the tip tip member has a tip tip wire through hole on a center line of the body wire through hole, and covers the tip of the chip body. Attached to a chip body, the wear resistant member has a greater degree of wear resistance than the chip body, is provided between the chip body and the tip end member, and has a front wire through hole on the center line of the body wire through hole. The contact tip for welding according to claim 1, further comprising: 5. A tip body, a wear resistant member, a mounting member for attaching to a welding wire power feeding portion, and a leaf spring, wherein the tip body has a body wire through hole penetrating in a length direction from a front end to a rear end. The wear resistant member has a greater wear resistance than the chip body, is inserted into the tip side of the body wire through hole, and has a front wire through hole on the center line of the body wire through hole, The member has electrical conductivity and is stronger than the chip body, is inserted into the rear end side of the body wire through hole and projects from the rear end of the chip body, and the rear wire penetrates on the center line of the body wire through hole. The rear wire through-hole has a rear end side thicker than the front end side, the leaf spring includes a holding portion and a spring portion, and the holding portion is inside the rear end of the rear wire through-hole. Mounted along the circumference The spring portion is integrally provided in the holding portion and is housed at the rear end side of the rear wire through hole so as to press the welding wire penetrating the rear wire through hole toward the inner wall side of the rear wire through hole. The contact tip for welding, which is characterized by 6. The chip body and the wear resistant member are
The welding contact tip according to claim 2, 3 or 5, wherein the welding tip is made of metal that is welded to each other by arc discharge with a welding wire penetrating the front wire through hole. 7. A tip wear-resistant member, wherein the tip wear-resistant member has a greater degree of wear resistance than the wear-resistant member, and is inserted into the body wire through hole on the tip side of the wear-resistant member. A wear resistant wire through hole is provided on the center line of the through hole, the tip body covers the tip of the tip wear resistant member, and has a tip wire through hole at the tip on the center line of the wear resistant wire through hole. The contact tip for welding according to claim 2, 3, 4, 5, or 6. 8. A tip body, a leaf spring, a tip end member, and a wear-resistant member, wherein the tip body has a body wire through-hole penetrating in a length direction from a front end to a rear end. The hole is thicker on the rear end side than on the front end side, the leaf spring is composed of a holding portion and a spring portion, and the holding portion is attached along the inner circumference of the rear end side of the main body wire through hole, A part is integrally provided on the holding part and is accommodated at the rear end side of the main body wire through hole so as to press the welding wire penetrating the main body wire through hole toward the inner wall side of the main body wire through hole; The tip member has a tip tip wire through hole on the center line of the body wire through hole, is attached to the tip body by covering the tip of the tip body, and the abrasion resistant member has a degree of abrasion resistance higher than that of the tip body. big Further, the welding contact tip is provided between the tip body and the tip end member and has a front wire through hole on a center line of the body wire through hole.