JPH06224Y2 - Arc shield and arc shield device for arc stud welding - Google Patents

Description

[Detailed Description of the Invention] << Industrial field of application >> The present invention protects the arc from the atmosphere when welding one end of a stud dowel onto a welded metal body, and at the same time, raises the weld metal, that is, flashes. The present invention relates to an improvement relating to an annular arc shield that is used by being mounted on a weld metal in advance in a state of being fitted to the stud dowel to form (overfill), and an arc shield device using this arc shield.

<< Prior Art >> A conventional arc shield a is formed of ceramics as a non-combustible material in an annular shape with a considerable thickness as shown in FIG.
An opening d of a small-diameter ring portion c that is placed on the upper side of the ring
A stud dowel a is inserted into the above, and a cylindrical holding tool f is fitted into the small-diameter ring portion c to press the large-diameter ring portion b against the welded metal body A. The lower end portion of the stud dowel e is welded to the welded metal body A by means of, and g in the drawing indicates a gas vent port.

However, in the case of the above-mentioned conventional example, since ceramics is adopted as the material in consideration of withstanding the heating by the arc, it is possible to achieve the original purpose of shutting off the atmosphere and forming flash as described above. However, after welding is completed, this arc shield must be removed, and the arc shield in the adhered state must be broken, which causes ceramic fragments to scatter around and a great deal of labor and labor to clean it. Not only is it time and cost consuming, but the rather expensive arc shield made of ceramics is consumed each time.

Moreover, since it is made of ceramics, the arc shield tends to have moisture, and when an arc shield in such a moisture absorbing state is used, good welding cannot be performed, so that such trouble does not occur. In addition, sufficient equipment and caution will be required for its storage,
There are many problems.

<Problems to be Solved by the Invention> The present invention has been studied in view of the above-mentioned problems of the conventional example.
In the arc shield for arc stud welding according to claim (1), the existing idea of requiring strength and inviscosity to the arc shield as in the conventional example is abandoned, and the arc time during welding work is actually 1 Paying attention to the fact that it is about 2 seconds, if the idea can be changed and the effect as an arc shield can be achieved only for this time, it may be a combustible material such as paper instead of a non-combustible material. By doing so, after welding, if it is formed into an appropriate thin wall, it will burn out, or even if it does not burn out, the residue will not scatter, and therefore cleaning after work becomes unnecessary, at least It has been possible to pay attention to the fact that the labor can be greatly saved, and the purpose is to try to eliminate the above-mentioned conventional defects.

According to claim (2), in the arc shield according to claim (1), an ignition delay layer made of an appropriate inorganic substance is formed on the required inner surface of the arc shield. By controlling the time until the arc shield is ignited and the combustion time, it is possible to satisfy the original effect of the arc shield and to try to make the cleaning effect after welding more satisfactory. There is.

According to claim (3), not only the arc shield as claimed in the above claims (1) and (2) is used as it is, but also a receiving metal fitting such as a metal is frontally fitted to the outside thereof. By providing an arc shield device, it is possible to further prevent unintentional burning of the arc shield due to combustible materials, to prevent the arc shield from fluctuating due to internal pressure due to the arc, and to protect the bracket from the arc by the arc shield. By doing so, the purpose is to enable semi-permanent use of the receiving fitting.

<< Means for Solving the Problem >> In order to achieve the above-mentioned object, the present invention provides:
A peripheral strip-shaped sheet portion placed on the welded metal body, and
A rising seat portion that is erected upward from the inner peripheral edge of the outer peripheral strip-shaped sheet portion, and a lateral seat portion that is curved inward from the upper end edge and forms a through hole for a stud dowel with an inner peripheral circular edge. The swelling sheet portion consisting of and is intended to provide an arc shield for arc stud welding, which is integrally formed in a thin wall with a combustible material such as paper, non-woven fabric, or plastic, and in the claim (2), In addition to the arc shield of item (1), the content is that an ignition delay layer made of an inorganic substance such as silicon or fluororesin is formed on at least the inner surface of the raised sheet portion.

And in the arc shield device of claim (3), not only the arc shield of claim (1) or claim (2), but also on the outer surface from the outer peripheral strip-shaped sheet portion of the arc shield to the raised sheet portion. It is configured such that a receiving metal fitting made of metal, ceramics, or the like, in which an insertion opening communicating with the opening of the arc shield is opened so as to come into contact with the fitting, is placed.

<Operation> When the arc shield according to claim (1) is used, the stud dowel is fitted into the arc shield through the opening, the lower end of the arc is mounted on the welded metal body, and welding is performed according to a conventional method.
The arc shield made of paper, non-woven fabric, plastic, etc. protects the arc from the atmosphere and can form a flash called a refill inside the arc. Such arc time is 1-2 seconds, so welding is completed. Until then, because the shape is maintained and the wall thickness is thick, the arc shield burns and disappears due to heating that is continued even after the arc time has elapsed, so excessive solidification formation occurs in the state where some unburned residue occurs. To be done.

When using the arc shield of claim (2), since the ignition delay layer by the inorganic substance applied to the inner surface controls the ignition time or the burning time of the arc shield based on the arc, these times Can be easily controlled with high accuracy.

In the arc shield device according to claim (3), the arc shield, even when the positional displacement occurs due to the internal pressure at the time of arc, the metal fitting fitted to the outside of the arc shield completely blocks this, Since there is no hindrance to the protection of the arc from the outside air, and no excessive uneven thickness is generated, and the receiving metal fitting is not directly subjected to the arc, there is no wear due to melting damage or the like, and it can be used for a long time.

<Example> The present invention will be described in detail with reference to the illustrated example.
Then, as shown in FIGS. 1 and 2, an outer peripheral strip-shaped sheet portion 1 to be placed on the weld metal body A,
It is composed of a swelling sheet portion 2 which is continuously provided to form a flash (extra heap), and the outer peripheral belt-like sheet portion 1 is continuously provided with corrugations 1a as shown in FIG. As shown in FIG.
Is opened.

Further, the rising seat portion 2 is a rising seat portion 2a which is erected upward from the inner peripheral edge 1c of the outer peripheral belt-like sheet portion 1.
And the lateral seat portion 2c bent inward from the upper end edge 2b thereof, and the inner circumferential circular edge 2d of the lateral seat portion 2c forms the through hole 3 for the stud dowel e. In the present invention, the outer peripheral strip-shaped sheet portion 1 and the raised sheet portion 2 are integrally formed of a combustible material such as paper, non-woven fabric or plastic to have a thin wall thickness of, for example, about 1 mm.

That is, the above thickness varies depending on what is selected for the material such as paper, non-woven fabric, plastic, etc., and even if it is the same paper, how the material is made, the point is that when welding as described above , The arc time of about 1 to 2 seconds does not burn or burn, and it burns out after this arc time, or at least part of it burns. Will be selected.

Next, in claim (2), as shown in FIG. 3, in addition to the arc shield of claim (1), at least the inner surface of the raised sheet portion 2 is covered with silicon, fluorine resin, or the like. The ignition delay layer 4 made of the inorganic substance is formed by means such as coating, and, of course, as in the illustrated example,
It is desirable that the ignition delay layer 4 is also formed on the lower surface of the outer peripheral band-shaped sheet portion 1, so that silicon or the like is applied to the entire inner surface.

Next, the arc shield device according to claim (3) will be described below with reference to FIGS. 4 to 10.

First, the arc shield according to claim (1) or (2) above is used, but the arc shield contacts the entire outer surface of the arc shield from the outer peripheral belt-shaped sheet portion 1 to the raised sheet portion 2, and further, the passage of the arc shield. Insertion port 5a, which communicates with port 3 and is stacked
The metal fitting 5 having an opening is placed on the arc shield, and it is preferable to select steel, copper or ceramics as the material for this metal fitting 5. Of course, to use this, As shown in FIG. 5, the stud dowel e is fitted from the insertion opening 5a of the metal fitting 5 into the extra space 6 of the arc shield through the opening 3 of the arc shield.

Now, as the above-mentioned receiving fitting 5, it is simply formed in an annular shape,
This may be fitted from the lower end of the stud dowel e as shown in FIG. 5, or the head h of the stud dowel e may be connected to the stud welder holder body B shown in FIG.
On the other hand, an arc D is laid horizontally from the guide rod C hung vertically from the stud welder holder B toward the stud dowel e, and is formed in an arc shape via a hinge E ₁ provided at the tip end thereof. As shown in FIG. 7 (b), the half receiving brackets 5b, 5c are attached from the outer side of the arc shield previously attached to the lower end of the stud dowel e.
5c may be closed to fit the arc shield.

Here, in the embodiment shown in FIG. 8, a pair of arcs D ₁ and D ₂ are projected on the guide rod C via a hinge E ₂ , and the above-mentioned semi-circle is attached to the free ends of these arcs D ₁ and D _2. The metal fittings 5b and 5c are fixedly provided. In the embodiment shown in FIG. 9, the arc D projects from the guide rod C as in the case shown in FIG. the hinge E ₁ provided at the tip, pivotally mounted at one end of a pair of half receiving metal 5b, one end of the half receiving metal 5c and the other end to the other of the half-split receiving metal 5b is pivoted by a hinge E ₃ These are configured so that they can be closed and closed using hinges E ₁ , E ₂ and E ₃ so that the half-fitting brackets 5b and 5c are annular.

Further, in the embodiment shown in FIG. 10, in the case where the headless stud dowel e'is used, the above-mentioned annular receiving fitting 5 is fitted in advance to the upper part of the stud dowel e ', The state is held by a fastener F pivotally attached to a connecting portion B ₁ of the stud welder holder body B with a hinge E ₄ , and the fastener F is opened at appropriate times as shown in FIG. 10 (b), It is also possible to lower the receiving fitting 5 and fit it on the arc shield.

Actually, the dimensions of the arc shield are 1 mm in thickness, the height of the gas vent is also about 1 mm, the height of the rising sheet portion is 7 mm, and when the outer peripheral belt-like sheet portion 1 is circular, it is approximately 34 mm. Various sizes of products are used, such as a through hole 3 having a diameter of about 18 mm.

<Effect of device> Since the device of the present invention is configured as described above, claim (1)
When the arc shield is used, since it is made of flammable material such as thin paper, non-woven fabric, plastic, etc., it is not burned by the arc within the arc time that ends instantly, and the arc equivalent to that of conventional ceramics is used. In addition to being able to exert a shielding effect, it will eventually burn out all or part of it due to subsequent heating, so it is possible to eliminate cleaning after the completion of welding work, or even a very small amount of treatment. It is only necessary and because it is not like ceramics, cleaning can be performed easily.

In addition, paper, non-woven fabric, and plastic are cheaper than ceramics as materials, and because they are thin, they are quantitative and also have good productivity, so a large cost reduction can be expected. Since it has low hygroscopicity, special storage equipment and special care are unnecessary.

Further, when using the arc shield of claim (2), since the ignition delay layer is formed on the inner surface, it is possible to easily and accurately control the ignition time and burning time of combustible materials such as paper, nonwoven fabric, and plastic. Therefore, it is possible to provide a highly reliable arc shield.

Further, in the arc shield device of claim (3), not only the arc shield but also the metal fittings such as metal or ceramics is used for the fitting, so that the arc shield is unwilling due to the internal pressure generated by the arc. As a result, good welding is assured, and the metal fitting is not burnt, so that it can be used for a long period of time.

[Brief description of drawings]

1 is a perspective view of an arc shield according to claim (1) of the present application, FIG. 2 is a vertical sectional front view of the same as above, FIG. 3 is a vertical sectional front view showing the arc shield of claim (2), and FIG. Fig. 5 is a vertical sectional front view of the arc shield device according to item (3), Fig. 5 is a vertical sectional front view of the same in use, and Fig. 6 is a side view in which a part of an arc stud welding machine using another embodiment of the same device is cut away. FIGS. 7 (a) and 7 (b) are plan views showing the receiving brackets of the same apparatus in the open and closed states, respectively, and FIGS. 8 and 9 show the different types of receiving brackets in the open state. Plan view, FIG. 10 (a)
(b) is a partial front schematic view showing the above-mentioned holding state and detached state of the arc stud welding machine which holds the annular arc stud detachably, and FIG. 11 shows a conventional arc shield. It is a vertical cross-sectional front view of the used state. 1 …… Outer band-shaped sheet part 1c …… Inner peripheral edge 2 …… Rising seat part 2b …… Upper end part 2c …… Horizontal sheet part 2d …… Inner circular edge 3 …… Vortex opening 4 …… Ignition delay Layer 5 …… Receiving metal fitting 5a …… Insertion port A …… Welded metal body e, e '…… Stud dowel

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Fumio Isogawa 7-22-17 Nishigotanda, Shinagawa-ku, Tokyo Otani Industry Co., Ltd. (72) Inventor Eiji Suzuki 129-9 Komagaki, Nagareyama City, Chiba Prefecture 72) Creator Ogata Motoomi 5-1-1 Homigaoka, Toyota City, Aichi Prefecture 138-101 (72) Creator Hiroshi Ochiai 1-2-1-3 Yachiyo Tainan, Yachiyo City, Chiba Prefecture

Claims (3)

[Scope of utility model registration request] 1. An outer peripheral strip-shaped sheet portion placed on a welded metal body, a rising sheet portion standing upward from an inner peripheral end edge of the outer peripheral strip-shaped sheet portion, and a curved inner portion from an upper end edge thereof. Then, the raised sheet portion including the laterally oriented sheet portion having the inner peripheral circular edge formed with the passage for the stud dowel is integrally formed in a thin wall with a combustible material such as paper, nonwoven fabric, or plastic. Arc shield for arc stud welding. 2. An outer peripheral strip-shaped sheet portion placed on a welded metal body, a rising sheet portion standing upward from an inner peripheral end edge of the outer peripheral strip-shaped sheet portion, and a curved inner portion from the upper end edge thereof. Then, the rising sheet portion composed of the laterally oriented sheet portion in which the opening for the stud dowel is formed by the inner peripheral circular edge is integrally formed in a thin wall with a combustible material such as paper, nonwoven fabric, and plastic, and An arc shield for arc stud welding, wherein an ignition delay layer made of an inorganic substance such as silicon or fluororesin is formed on at least the inner surface of the raised sheet portion. 3. An outer peripheral belt-shaped sheet portion placed on a welded metal body, a rising sheet portion standing upward from an inner peripheral end edge of the outer peripheral belt-shaped sheet portion, and a curved inner portion from the upper end edge thereof. Then, the raised sheet portion including the laterally oriented sheet portion having the inner peripheral circular edge formed with the passage for the stud dowel is integrally formed in a thin wall with a combustible material such as paper, nonwoven fabric, or plastic. Arc shield or, at least on the inner surface of the rising sheet portion of the arc shield, the arc shield formed by a layer for ignition delay by an inorganic substance such as silicon or fluororesin, the rising sheet from the outer peripheral belt sheet portion. Arc stud melted by abutting on the outer surface up to the part of the arc shield and having a receiving metal fitting made of metal, ceramics, etc., in which an insertion opening communicating with the opening of the arc shield is opened. Use arc shield apparatus.