KR890003097B1 - Nozzle for gas shielded arc welding - Google Patents

Abstract

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Description

[Name of invention]

Nozzles for Gas Sealed Arc Welding

[Brief Description of Drawings]

1 is a longitudinal cross-sectional view of a first embodiment of the present invention, FIG. 2 is a partially broken side view of a support ring of a second embodiment of the present invention, and FIG. 3 is a partially broken side view of a fixing ring of a second embodiment of the present invention, and FIG. Partial longitudinal cross-sectional view of the third embodiment of the present invention, FIG. 5 is a longitudinal cross-sectional view of the fourth embodiment of the present invention, FIG. 6 is a partial longitudinal cross-sectional view of the fifth embodiment of the present invention, and FIG. 7 is a partial longitudinal cross-sectional view of the sixth embodiment of the present invention. 8 is a longitudinal sectional exploded view of the seventh embodiment of the present invention, FIG. 9 is a longitudinal sectional view of the embodiment shown in FIG. 8, FIG. 10 is a partial longitudinal sectional view of the eighth embodiment, and FIG. 11 is a sectional view of the ninth embodiment. Fig. 12 is a partial longitudinal cross-sectional view of the tenth embodiment, and Figs. 13 to 16 are partial longitudinal cross-sectional views of the first to fourth modified examples of the support ring of the embodiment shown in Fig. 11, and Figs. First to third modifications of the nozzle member of the embodiment shown in FIG. Partial longitudinal cross-sectional view of Figure 20 and is the first embodiment turns one embodiment of the fourth change of the nozzle member shown in claim 11 is also partially broken side view.

* Explanation of symbols for main parts of the drawings

2: welding torch 38: plane

4: support ring 40: annular protrusion

6: nozzle member 42: tapered surface

8: retaining ring 44: elastic body

10: female thread 46: annular groove

12: male portion 48: end portion

14: end 50: deformation part

16: annular groove 52: small diameter

18: annular groove 54: annular groove

20: ring spring 56: slope

22: female thread portion 58: tapered surface

24: engaging portion 60: annular projection

26: engaging surface 62: annular projection

28: projection 64: tapered surface

30: guide groove 66: tapered surface

32: guide groove 68: protrusion

34: outer ring 70: metal barrel

36: inner ring 72: ceramic layer

Detailed description of the invention

Best Mode for Carrying Out the Invention

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

In the first embodiment shown in FIG. 1, the gas seal arc welding nozzle has a cylindrical nozzle member 6 and a nozzle member which are mounted to the tip of the support ring 4 and the support ring 4 screwed to the tip of the welding torch 2. It has a fixing ring 8 for fixing 6 to the support ring 4. The support ring 4 has female threads 10 and male threads 12 provided on its inner and outer circumferences, respectively, and female threaded portions 10 of its inner circumference are screwed to the distal end of the welding torch 2. An end portion 14 is formed on the inner circumference of the distal end of the support ring 4, and one end of the nozzle member 6 is embedded in the distal end 14.

In addition, the end part 14 may be abbreviate | omitted and the one end surface of the nozzle member 6 may be abutted on the front end surface of the support ring 4 (refer FIG. 7 Example).

At the outer periphery near the both ends of the nozzle member 6, annular grooves 16 and 18 having arcuate cross sections are provided. In one of the annular grooves 16, a ring spring 20 is impregnated, a ring spring 20 is impregnated, and an outer circumference of the ring spring 20 protrudes from an outer circumferential surface of the nozzle member 6 to form an annular projection.

The nozzle member 6 is formed of silicon nitride (Si ₃ N ₄ ) or silicon nitride-based ceramics having the main component thereof.

Ceramics called Salon are also used in which black (Si) and nitrogen (N) are added to aluminum (Al) and oxygen (O) again.

In this specification, this sialon is also included in the silicon nitride ceramics.

Silicon nitride-based ceramics have been confirmed to be excellent materials for high temperature strength, abrasion resistance and thermal shock resistance, and are particularly preferable as the material of the nozzle member 6.

In addition, as a result of the comparative test between the silicon nitride nozzle member and the alumina (Al ₂ O ₃ ) nozzle member, the non-adhesiveness of the spatter, the peelability of the spatter, and the nozzle member of the silicon nitride system are much better. It confirmed that it is excellent.

The retaining ring 8 is provided with a female threaded portion 22 that can engage the male threaded portion 12 of the support ring 4 on its inner circumference. In addition, an annular engagement portion 24 that is radially inwardly formed is formed at the distal end of the fixing ring 8 so that a plane perpendicular to the axis of the nozzle inside the engagement portion 24 is an engagement surface 26 that engages the ring spring 20.

Various materials can be used for forming the support ring 4 and the retaining ring 8, but since the workability is good and the thermal conductivity is good enough to effectively cool the nozzle member 6 from the welding torch body side, such as copper brass. Copper or aluminum alloys are suitable. The gas seal arc welding nozzle constructed as mentioned above is assembled in the following procedure. First, the female threaded portion 10 of the support ring 4 is screwed into the distal end of the welding torch 2 and inserted into one end of the nozzle member 6 within the end 14 of the simultaneous support ring 4.

In this state, the female threaded portion 22 of the retaining ring 8 is engaged with the male threaded portion 12 of the support ring 4. In this case, when the fixing ring 8 is rotated, the fixing ring 8 moves toward the torch 2 as indicated by the arrow, and with this, the engaging ring 26 moves toward the torch 2 side. The engagement surface 26 is in contact with the ring spring 20 on the nozzle member 6.

When the fixing ring 8 is rotated again from this state, the nozzle member 6 is pushed to the support ring 4 through the ring spring 20 so that one end of the nozzle member 6 is pushed to the support ring 4 in the end 14 of the support ring 4. It is fixed.

Because of the structure as described above, high dimensional accuracy is not required for the nozzle member 6. In other words, the distance between the annular groove 16 and one end surface of the nozzle member need not be determined with high accuracy. In addition, the depth of the annular groove 16 need not be determined with high precision. Therefore, the manufacturing of the nozzle member 6 becomes easy.

In addition, the annular groove 18 at the other end of the nozzle member 6 is to reverse the nozzle member 6 when the end close to the arc of the nozzle member 6 to use the nozzle member again.

Of course, the annular groove 18 can be omitted. 2 and 3 show a second embodiment in which the supporting ring 4 and the fixing ring 8 of FIG. 1 are changed. In this example, the circumferential projection 28 is provided on the outer circumference of the support ring 4, while the guide ring 30 in which the projection 28 is recessed is provided in the fixing ring 8. By engaging the guide groove 30 with the projection 28, the nozzle member 6 can be fixed to the support ring 4 as in the embodiment shown in FIG. The guide groove 30 is inclined with respect to the nozzle axis.

자형으로 구성할 수도 있다. 또 도시 하지 않하였지만 돌기 28에 스프링을 부착하여 스프링의 탄성을 이용하여 노즐부재 6을 고정할수도 있다.However, as indicated by the broken line in Fig. 3,

It can also be configured in the shape of a child. Although not shown, a spring may be attached to the protrusion 28 to fix the nozzle member 6 using the elasticity of the spring.

4 shows a third embodiment in which the support ring 4 and the fixing ring 8 of FIG. 1 are changed. In this example, the retaining ring 8 consists of an outer ring 34 supported by a rotational material on the outer circumferential surface of the support ring 4 and an inner ring 36 screwed to the inner peripheral end of the outer ring 34. The outer ring 34 or the inner ring 36 moves in the direction of the arrow and the engagement surface 26 of the inner ring 36 pushes the ring spring 20.

FIG. 5 shows a fourth embodiment in which the engagement surface 26 of the fixing ring 8 of FIG. In this example, the engagement surface 38 of the retaining ring 8 is tapered. In this manner, by tapering the engagement surface 38, the ring spring 20 and the nozzle member 6 are pushed not only in the axial direction but also radially inward, so that the nozzle member 6 can be more securely fixed. In addition, it is possible to always set the axial center position of the nozzle member 6 in the correct position. FIG. 6 shows a fifth embodiment in which the engagement surface 26 of the inner ring 36 of FIG. In this example, the nozzle member 6 is fixed by forming a tapered engagement surface 38 at the inner circumference of the inner end of the inner ring 36 and bringing the tapered engagement surface 38 into contact with the ring spring 20.

7 shows a sixth embodiment of the present invention. A tapered annular projection 40 is integrally formed on the nozzle member 6, and a tapered engagement surface 38 is formed on the inner circumference of the tip of the fixing ring 8. By rotating the retaining ring 8, the engagement surface 38 pushes the tapered surface 42 of the annular projection 40 in the axial direction and the radially inward direction.

8 and 9 show a seventh embodiment of the present invention. The difference with the embodiment shown in FIG. 1 lies in the shape of the engagement surface of the stationary ring 8 and the coupling means of the stationary ring 8 and the support ring 4. The engagement surface 38 of the fixing ring 8 is tapered and acts to push the ring member 6 in the axial direction and the radially inward direction as in the embodiments shown in FIGS. 5, 6 and 7. In order to fix the nozzle member 6 by moving the fixing ring 8 in the right direction of FIG. 9 while pushing the nozzle member 6 to the support ring 4, spot fixing is performed between the fixing ring 8 and the support ring 4. Seal welding or soldering may be used instead of spot welding.

In this embodiment, the support ring 4, the nozzle member 6 and the retaining ring 8 are integrally fixed so that the whole can be treated as one part, which is convenient for operation.

FIG. 10 shows an embodiment of FIG. 8 in which an elastic body is sandwiched between the nozzle member 6 and the support ring 4 of FIG.

In this example, an elastic body 44 is provided between one end of the nozzle member 6 and the end 14 of the support ring 4. This elastomer 44 is a leaf spring but may be made of silicone rubber.

By the help of the elastic force of the elastic body 44, the nozzle member 6 is securely fixed to the support ring 4. In addition, the axial dimension errors of the nozzle member 6 and the support ring 4 are also absorbed by the elastic member 44. 11 shows a ninth embodiment in which the fixing ring 8 and the supporting ring 4 of FIG. 9 are changed. In this example, the end 48 on the left side of the annular groove having a spherical cross-section on the outer periphery of the welding torch 2 of the support ring 4, that is, the end 48 toward the welding torch 2, helps to secure the retaining ring 8 and the support ring 4. Will be. In order to fix the nozzle member 6 to the support ring 4, the fixing ring 8 is first moved in the direction of the welding torch 2.

Next, the first end of the nozzle member 6 is pushed to the end 14 of the support ring 4, and the fixing ring 8 is pushed inward in the radial direction at a position corresponding to the annular groove 46 of the support ring 4 to deform to form the deformation part 50. .

This deformation work is carried out by spot welding. That is, the electrode of spot welding is pushed from the outer periphery of the fixing ring 8, and the deformation | transformation part 50 is formed simultaneously with spot welding. The fixing of the retaining ring 8 and the support ring 4 is secured both by spot welding between the deformable portion 50 and the annular groove 46 and by joining the deformed portion 50 and the end 48. The deformation part 50 can be formed by a method other than the spot welding method. In other words, it is possible to combine the retaining ring 8 and the support ring 4 simply by mechanical deformation. In addition, the number of deformation parts 50 can also be selected suitably.

FIG. 12 shows a tenth embodiment in which an elastic body is sandwiched between the nozzle member 6 of FIG. 11 and the support ring 4. This embodiment corresponds to the embodiment shown in FIG. 10 and is the same as the embodiment shown in FIG. 10 except for combining the deformable portion 50 and the annular groove 46 shown in FIG. FIG. 13 shows a first modification of the support ring 4 shown in FIG. The small diameter part 52 is formed in the edge part of the welding torch 2 side of the support ring 4. As shown in FIG. The end 48 of the small diameter portion 52 prevents the fixing ring 8 from escaping the deformation portion 50.

FIG. 14 shows a second modification of the support ring 4 shown in FIG. An annular groove 54 of an arcuate cross section is formed on the outer circumference of the support ring 4 instead of the annular groove 46 of the spherical cross section of FIG.

The inclined surface 56 on the left side of the annular groove 54 prevents the deformation portion 50 of the fixing ring 8 from escaping. FIG. 15 shows a third modification of the support ring 4 shown in FIG.

A tapered surface 58 is formed near the end portion of the support ring 4 on the welding torch side. The tapered surface 58 prevents the deformed portion 50 of the fixing ring 8 from escaping.

FIG. 16 shows a fourth modified example of the support ring 4 shown in FIG. In place of the annular groove 46 of FIG. 11, an annular projection 60 having a spherical cross section is formed on the outer circumference of the support ring 4. The right side of the annular projection 60 prevents the end portion 48 from escaping the deformable portion 50 of the fixing ring 8.

In addition, the end part 48 etc. which are formed in the outer periphery of the support ring 4 are not limited to the change shown in FIGS. 13-16, and a yaw may just be able to prevent the deformation | transformation part 50 of the fixing ring 8 to come out. In addition, the end portion 48 and the like are formed on the outer circumference of the support ring 4 in the same manner as in the modification described above to facilitate the manufacture of the support ring 4.

Therefore, you may provide the edge part 48 etc. only in the position which forms the deformation | transformation part 50. 17 to 19 show examples of the first to third modifications of the nozzle member 6 shown in FIG. In FIG. 11, the ring spring 20 is joined to the annular groove 16 of the nozzle member 6 to form an annular projection. Such a configuration facilitates the manufacture of the nozzle member 6. The annular projection may be formed integrally with the multi-faceted nozzle member 6.

In Fig. 17, the annular projection 62 having a semicircular cross section is formed integrally with the nozzle member 6. In Fig. 18, the entire nozzle member 6 is formed in a tapered shape, and the tapered surface 64 on the two sides of the welding torch of the nozzle member 6 is used as the annular projection. In FIG. 19, the projection 68 which has a tapered surface 66 is formed in one end of the nozzle member 6. In FIG. 20 shows a fourth modification of the nozzle member 6 shown in FIG. The nozzle member 6 forms ceramics 72 by thermal spraying on the inner and outer surfaces of the metal barrel 70.

The above-described first to tenth embodiments and various modifications can be implemented in various combinations. For example, the nozzle member 6 shown in Figs. 17 to 19 can be used in the embodiments shown in Figs. 6, 7, 9, 10 and 12, and the nozzle member 6 shown in Fig. 20 is used in all the embodiments described above. Can be used for

[Industry availability]

The nozzle for gas seal arc welding of this invention is useful when it mounts to the torch for carbonic acid gas arc welding in which a spatter generate | occur | produces especially.

Detailed description of the invention

[Specification]

[Technical Field]

TECHNICAL FIELD The present invention relates to a nozzle for gas seal arc welding which reduces the damage caused by a welding spatter by using a heat-resistant non-conductive material in the nozzle.

Background Technology

Conventionally used gas seal arc welding nozzles are formed integrally with metal, mainly copper, and are used in conjunction with the tip of the welding torch. When weld spatter occurs, it becomes easy to attach a spatter to a metal nozzle. If a hot spatter adheres to the metal nozzle, the nozzle may partially melt and become tattered.

In this way, a spatter becomes easy to adhere to the damaged nozzle. If the spatter is attached to the inner surface of the nozzle, the passage of the shield gas is narrowed, and it is easy to bridge with the contact chip and the spatter attached to the nozzle inner surface. When the contact chip and the nozzle inner surface are bridged, the contact treatment and the welded object are shorted through the nozzle when the nozzle contacts the welded object.

As a result, it caused irrationality that damaged not only the nozzle but also the torch body. This brings about the drawback of economic loss due to the damage of the equipment, and at the same time, it causes the psychological pressure that the operator must work in consideration of the above short circuit during the welding work.

It is also necessary to stop the welding operation in order to remove the spatter attached to the nozzle. It takes a great deal of effort to get rid of the spatter firmly attached to the nozzles. The problem as described above is particularly remarkable in carbon dioxide arc welding where spatter is likely to occur.

And when carbonic acid arc welding is used for automatic welding by robots etc. which are rapidly expanding its application in recent years, from a viewpoint of carrying out continuous operation in a long time, the request | assignment of a spatter to a nozzle as mentioned above, or with this, Preventing device damage is one of the major technical challenges.

Japanese Patent Application Laid-Open No. 57-111473 proposes a means for preventing the spatter from adhering to the nozzle inner surface. That is, the heat resistant non-conductive material is coated on the inner circumferential surface of the metal nozzle. According to this technique, it becomes difficult for a spatter to adhere to the inner peripheral surface of a nozzle. However, since the thermal expansion coefficient is significantly different from that of the heat-resistant non-conductive material and the metal, the nozzles are subjected to repeated thermal shock, and thus the life of the nozzle is limited, such as the heat-resistant non-conductive material is easily broken or peeled off.

On the other hand, it is also conceivable that the entire nozzle is formed of a heat-resistant nonconductive material such as ceramics.

However, as is well known, ceramics are prone to breakage in the presence of brass and the like, and even if a nozzle having the same shape as the conventional shape is formed using this ceramic, it is considered that the nozzle life is limited if it is practically used.

홈을 설치하고

홈 내에 계합돌부를 함입시키는 것에 의하여 노즐부재를 용접 토오치에 고정하고 있다.Therefore, the present applicant has limited the nozzle using the nozzle member made of ceramics in Japanese Patent Application No. 58-200573 filed on October 26, 2012. In other words, the nozzle is formed as a support ring and a nozzle member made of ceramics, while screwing the support ring at the tip of the welding torch and forming a handle rib having an engaging protrusion at the tip of the support ring. On one outer periphery

Install the groove

The nozzle member is fixed to the welding torch by engaging the engagement protrusion in the groove.

강합을 이용하기 위하여 노즐부재에 높은 치수정밀도가 요구된다. 따라서 노즐부재의 제작에 다대한 시간이 요하며 노즐부재가 고가의 것으로 되는 결점이 생긴다.This nozzle can eliminate the above drawbacks.

High dimensional accuracy is required of the nozzle member to utilize the steel. Therefore, a large amount of time is required for the fabrication of the nozzle member, and the disadvantage is that the nozzle member is expensive.

[Initiation of invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a nozzle for welding gas seal arc, which is difficult to attach to the spatter and, when the spatter is attached, its peelability is good and the short-circuit phenomenon as described above can be prevented and can be manufactured at low cost. have.

The nozzle of the present invention has a support ring mounted on the tip of the welding torch, a cylindrical nozzle member mounted on the tip side of the support ring, and a fixing means for fixing the nozzle member to the support ring. The nozzle member is formed of a heat resistant non-conductive material.

The electric fixing means pushes the nozzle member to the support ring to fix the nozzle member to the support ring. Since the nozzle member is formed of a heat-resistant non-conductive material as described above, the spatter becomes difficult to attach to the nozzle member, and the peeling property of the attached spatter is also improved. As a result, the short circuit between the contact chip and the object to be welded is prevented and the nozzle is prevented. It can improve the durability. The average useful life of this nozzle is ten times that of a conventional nozzle.

In addition, it is possible to weld the nozzle member in contact with the to-be-welded material, thereby preventing the failure of the shield due to the influence of wind and also maintaining the arc length at all times, thereby improving work efficiency.

In addition, since the structure described above is adopted, the nozzle member can be provided at low cost without requiring high dimensional accuracy of the nozzle member.

Claims (19)

Fixing the support ring 4 mounted on the tip of the welding torch 2 and the cylindrical nozzle member 6 and the nozzle member 6 mounted on the tip side of the support ring 4 to the support ring 4. And the electric nozzle member 6 is formed of a heat-resistant non-conductive material, and the electric fixing means 8 is pushed onto the support ring of the nozzle member to support the nozzle member 6 with the support ring 4. A nozzle for welding gas seal arc, characterized in that fixed to the. In the nozzle according to claim 1, the projection 28 on the outer circumferential surface of the electric nozzle member 6 is provided, and the electric fixing means 8 engages with the projection 28 on the electric nozzle member 6. Nozzle comprising a retaining ring (8) having a face (26, 38) and an engaging portion (22, 50) for engaging the electrical support ring (4). In the nozzle according to claim 2, an annular groove 16 is formed on the outer periphery of one end surface of the electric nozzle member 6, and the ring spring 20 is inserted into the annular groove 16 to form the nozzle member. A nozzle, characterized in that to form an annular projection projecting from the outer peripheral surface of (6). The nozzle described in the claim 2, wherein the annular projection 62 having a semicircular cross section is formed integrally with the nozzle member 6 in the outer circumference of one end of the electric nozzle member 6. Nozzle, characterized in that. The nozzle according to claim 2, wherein the outer circumferential surface of the electric nozzle member 6 has the same tapered surface 64, and the large diameter portion of the tapered surface fulfills the role of the electric projection. Nozzle made. The nozzle according to claim 2, wherein the tapered surface is formed on the outer circumference of one end surface of the electric nozzle member (6). Nozzle according to claim 2, characterized in that the engagement surface (26) of the electric retaining ring (8) is made from a plane perpendicular to the axis of the nozzle. The nozzle according to claim 2, wherein the engagement surface (38) of the electric retaining ring (8) comprises a tapered surface concentric with the axis of the nozzle. In the nozzle according to claim 2, the engaging portion of the electric retaining ring (8) is a female threaded portion (22) provided on the inner circumferential surface of the retaining ring (8) and the retaining ring (8) on the outer circumferential surface of the electric support ring (4). And a male screw portion (12) engaged with the female screw portion (22) of the nozzle. In the nozzle according to claim 2, the electric retaining ring (8) has an outer ring (34) and an inner ring (36), and the inner circumferential surface of one end of the outer ring (34) has an electric support ring ( 4) The engagement screw is installed on the inner circumferential surface of the other end of the electric outer ring 34 in engagement with the outer circumferential surface of the outer ring 34, and the electric inner ring is a male engagement portion and an electric engagement surface (26, 38) engaged with the female thread of the electric outer ring. A nozzle having a). In the nozzle according to claim 2, the guide ring (30, 32) which is opened on one end surface of the fixed ring (8) is provided in the electric holding ring (8), and the outer circumference of the electric holding ring (4) A nozzle, characterized in that the cylindrical projections 28 are inserted into the electric guide groove (30, 32). The nozzle according to claim 11, wherein the electric guide groove is inclined with respect to the axis of the nozzle. In the nozzle according to claim 11, the electric guide groove 32

Nozzle, characterized in that formed in the shape of. The nozzle according to claim 2, wherein the engaging portion of the electric retaining ring (8) is formed by spot welding the retaining ring (8) and the electric support ring (4). In the nozzle according to claim 2, an end portion 48 facing the electric welding torch 2 side is formed on the outer circumferential surface of the electric support ring 4 to deform the electric retaining ring 8 And a deformable portion (50) engaging the end portion (48). The nozzle according to claim 14, characterized in that an elastic body (44) is arranged between the electric nozzle member (6) and the electric support ring (4). The nozzle according to claim 15, wherein an elastic body (44) is arranged between the electric nozzle member (6) and the electric support ring (4). The nozzle according to claim 1, wherein the electric nozzle member (67) is made of silicon nitride ceramics. The nozzle according to claim 1, wherein the electric nozzle member 6 is formed by spraying a layer 72 of a heat-resistant nonconductive material on the inner surface and the outer surface of the metal barrel 70. Nozzle made.

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