JPS60220592A - Carbon electrode rod for gauging and plasting - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a carbon electrode rod for gouging and plasting, and in particular, the present invention relates to a carbon electrode rod for use in gouging and plasting. Connectable carbon electrode for gouging and plasting [! It is related to sticks.

The gouging and plasting work is carried out by electric discharge between the electric flier 3 held by the holder 2 having the compressed air injection hole 1 and the workpiece surface 4 of the metal workpiece, as shown in the first ffl. 4 is melted and the molten metal is blown off with compressed air injected from the injection hole 1. During this work, the electrode rod 3 is worn out due to discharge, but several connected electrode rods for gouging and plasting have been proposed that allow the shortened electrode rod to be used effectively to the end. There is.

Conventionally, threadless electrode rods are used because they can complete the bonding instantaneously, as mentioned above.
A large push-in force is required for such a joint, and if this force is too weak, an accident may occur when the joint is pulled out.
If too much force is applied, accidents may occur, such as damage to the joints, and the work of adding electrode rods under high heat requires a high level of skill and intuition. Even with conventional unthreaded electrode rods connected in this way, the fitting force is not constant.

In order to improve the drawbacks of the electrode rods that are joined by the above-mentioned fitting force, the present inventors disclosed [
It is a continuous type carbon electrode rod, and one end has a convex shape and the other end has a concave shape, and the concave portion of one carbon electrode rod has the convex portion of another carbon electrode rod of the same type.・ At least a part of the part where the convex part and the concave part of the electrode rod come into contact with each other when they are joined is coated with a metal plating film that is continuous with the outer peripheral surface of the electrode body. and a portion of each of the outer circumferential surface of the convex portion and the inner circumferential surface of the concave portion is provided with a cotton filament groove that can be freely screwed into each other when an electrode rod is connected to the convex portion. ``Carbon electrode rod for gouging and plasting'' is disclosed.

However, with the electrode rods of the above invention, in order to join the electrode rods together during gouging or plasting work, it is necessary to rotate the electrode rods at least once and screw them together. However, this kind of joining work involves supporting the weight holder with one hand under high heat while rotating the new electrode rod with the other hand, which tends to result in insufficient joining, which results in the conventional method not being possible. Although this method is slightly better than electrode rods that are joined by screwing, it has not yet been able to completely prevent detachment due to loosening of the screwed portion.

Therefore, the inventors conducted further experiments and
No. 52,680 discloses a connecting type carbon electrode rod, in which a multi-thread thread is formed in the convex part in order to threadably connect the convex part of one electrode to the concave part of another electrode, and An electrode rod is proposed in which a multi-thread screw is formed in the concave portion to be engaged with the multi-thread screw, and the length of the thread progressing in the axial direction when the screw rotates once is increased, that is, the lead is increased. did.

The above-mentioned invention is disclosed in Japanese Unexamined Patent Application Publication No. 1986-1, which was previously filed by the present inventors.
Unlike the electrode rod described in No. 45290, this invention relates to an electrode rod that has almost no chance of detachment due to loosening of the threaded part. However, since the electrode rod of the same invention requires threading on the entire surfaces of the convex and concave portions, it cannot avoid the drawback that threading defects in the concave portions often occur.

An object of the present invention is to provide a carbon electrode rod for gouging and plasting that eliminates and improves the drawbacks of the electrode rods of the inventions or inventions, and the object is to provide a carbon electrode rod for gouging and plasting. The above objective can be achieved by providing a pole rod.

Next, the present invention will be explained in detail.

Referring to the drawings of the electrode rod for gouging and plasting of the present invention, the electrode rod has aspects as shown, for example, in the vertical cross-sectional views of FIGS. 2 to 4, respectively.

In Fig. 2, the convex part 5 is a truncated cone, and the concave part 6 is a corresponding truncated conical cylinder, and only the root part 8 of the convex part 5 and the peripheral end part 9 of the concave part 6 are threaded with multiple threads. 7 are provided, and a metal plating film 10 is provided continuously with the outer peripheral surface of the electrode main body up to the multi-thread thread portion of each of the convex and concave portions.
is applied.

The number of threads of the multi-thread screw is 2 to 4, and the shape of the convex portion may be a cylinder or a combination of a cylinder and a truncated cone. Therefore, the concave portion is different from each of the convex portions. The shape corresponds to the shape of .

Further, the metal plating film may not necessarily be applied to the threaded portion, but may be applied to the end face 11 of the housing.

The electrode rod of the present invention as described above and Japanese Patent Application Laid-Open No. 57-14529
When compared with the electrode rod described in No. 0 and Utility Model Application No. 57-52680, the present inventors have newly found that the following extremely excellent effects are obtained.

(a) The electrode rod of JP-A No. 57-145290, which has a single-thread screw with continuous threads, may become unusable if the thread is damaged in several places during handling, so the present invention provides a multi-thread screw. Even if the electrode rod is broken in one place, it will not become defective and can be used because there are continuous threads elsewhere.

(b) When the electrode frame of JP-A No. 57-145290 is used, the electrode rod can be added within three times and screwed together.
Even if the electrode rod No. 52680 is used, the screwing is completed by turning the electrode rod by four degrees. On the other hand, with the electrode rod of the present invention, the screwing can be completed completely by turning as little as 1/2, 1/3 or 1/4 of one revolution.

The reason for this is that when comparing a single thread thread with the same pitch as shown in Figure 5 (Al) and a double thread thread as shown in Figure 5 (t31), in the case of a single thread thread, it takes an electrode to reach the threading start point a from the threading end point bK. The rod must be rotated 360 degrees, but in the case of one thread of a double thread screw, it is only necessary to rotate it 180 degrees in order for the thread to advance from the threading start point c1 to the threading end point dl.
During this one rotation, the thread of another thread simultaneously advances from the threading start point c2 to the threading end point d2. Therefore, if a double thread screw is provided, the electrode rod can be completely screwed together by turning V2 times. For the same reason, if a triple thread screw is provided, V3
If a 3-turn four-thread screw is provided, it is possible to further reduce the turning of the electrode rod during screwing.

Therefore, when adding electrodes, even if the worker is holding a heavy holder, he or she can complete the addition of electrodes by slightly rotating the electrode with one hand. Ching work can proceed.

Next, as shown in FIG. This is an embodiment in which a multi-thread screw 7 is provided in a portion. In the electrode rod of the embodiment shown in the figure, the metal plating film 10 is shown up to the multi-thread screw 7, but the electrode rod of the embodiment does not have the metal plating film 10 applied to the screw 7. Even in these cases, the effects of the present invention can be fully achieved. Furthermore, the effects of the present invention can be similarly achieved even in the case of the 43 types of shapes of the convex portion and the gate-shaped portion to which the electrode rods are joined together, as described above.

The electric A14 rod shown in FIG. 4 has a multi-thread screw 7 provided at the tip end portion 12 of the convex portion 5 and the innermost end portion 13 of the concave portion 6, and the metal plating film lo is It is applied up to the root portion 8 of the convex portion 5 and up to the peripheral end portion 9 of the concave portion 6, respectively. In addition to the embodiment shown in the same figure, the object of the present invention can also be achieved with the embodiment shown in Fig. 3, which is similar to the above-mentioned embodiment in which the range of the metal plating film and the shapes of the convex and four parts are changed. I can do things.

In the electrode rod of the present invention, grooves may be provided in the convex portion g5 and/or the concave portion 6 in parallel to the axial direction of the first rod, thereby preventing screwing due to uneven thickness of the metal plating film. Incidence of defects 'ff: Can be reduced. Further, resin can be attached to the surfaces of the convex portion 5 and the concave portion 6, thereby preventing the resin from carbonizing during arc work and loosening of the screw.

Next, embodiments of the present invention will be explained in comparison with a conventional example.

Example 1 According to this embodiment, the thread is a multi-thread thread, that is, two threads.

Electrode rods with 3 threads and 4 threads, with a voltage of 1/2°V
Tests were conducted on electrode rods with threads that completed the V3 or V44 rotational screw engagement. On the other hand, in order to compare with the electrode rod of JP-A-57-145290 which had a single thread thread, the electrode rod was also V2. l/3 or v44
An electric one shear with a single thread that completes the rotational threading was also tested. In addition, each electrode rod has a metal plating film applied to the threaded part, and has a diameter of 15 m.
The length was 43011#l.

Table 1 shows that after the concave and convex parts of the two 'fd' and poles are completely screwed together, when tensile force is applied to both sides in the axial direction, the screws break and the screws come loose and come out. The tensile load at each time is shown in comparison to the number of rotations when screwed together.

In the experiments shown in the same table, the thread bit was 1.5 # in all cases.

As can be seen from the table, in the electrode rod of the comparative example, the fitting force decreases when the rotation required for screwing is reduced, but in the case of the electrode rod of the present invention, 'ft, ti! With the Ii rod, it is possible to reduce the rotation required for screwing while keeping the fitting force at a constant high value (approximately 50 to 9).

Example 2 A processing test was conducted on the electrode rod of the present invention and the electrode rod described in Japanese Utility Model Application No. 57-52680, and the comparison results are shown in Table 2. In addition, the number of processed electrodes was 20 each, and the electrode rod was 16 m in diameter and 430118 in length. The outer diameter of the convex part was 12 ssB, the length was 1611 m1, and the inner diameter of the concave part was 10.6.
8m1 (Female thread root diameter 12.6 m”), length 16
．． 51111 respectively.

Since the electrode rod of the comparative example has a large thread pitch, the machining time can be shortened. However, since threading is required on the entire surface, the percentage of the recessed portions being destroyed during threading is extremely high compared to the electrode rod of the present invention.

As can be seen from the above-described embodiments, the present invention allows a strong threaded connection to be obtained with a slight rotation, unlike conventional connection-type electrode rods, and the connecting portion of the electrode rod can be pulled out during push-in and gouging work. can provide a skip-free electrode rod.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of gouging and plasting work, FIGS. 2 to 4 are longitudinal cross-sectional views showing various embodiments of the pole rod of the present invention, and FIG. Same figure (
I3) is an explanatory diagram of the number of rotations when the double thread screws are respectively rotated and screwed together. 1... Compressed air injection hole, 2... Holder, 3...
Electrode rod, 4... surface to be processed, 5... convex portion, 6...
Portal portion, 7...Multi-thread screw, 8...Root portion, 9...
・Peripheral edge portion, 10... Metal plating film, 11... End surface, 12... Tip portion, 13... Innermost end portion, a...
・The starting point of a single thread screw, b...The ending point of a single thread screw, C1 and C2 are the starting points of a double thread screw, and dl and dl are the end points of a double thread thread. Patent Applicant IBIDEN Co., Ltd. Agent Patent Attorney Mura 1) Political Patent Attorney Takuya Hatano Figure 1

Claims (1)

[Claims] / A connected carbon electrode rod, one end of which is convex and the other end of which is concave.
A convex part of another carbon electrode rod of the same shape can be connected to the concave part of the in, and at least one of the parts that contact each other when the convex part and the concave part of the electrode rod are joined. There is an electric t in the department! ! A gold 1.1 plating film that is continuous with the outer peripheral surface of the iin main body is applied, and an electrode rod is connected to a portion of each of the outer peripheral surface of the convex part and the inner peripheral surface of the concave part. Carbon 11 (dli rod) for gouging and plasting is provided with multi-thread screws that can be screwed into each other. 3. An electric rod according to claim 7, comprising: a multi-thread screw provided at the tip end of the convex portion and the innermost end portion of the concave portion, respectively; No. 1! Pole bar. K. Intermediate area between the root part and tip of the convex part and intermediate area between the peripheral end part and the innermost end of the concave part,
Claim 1 comprising multi-thread screws, respectively.
Electrode rod described in section. Left: The electrode rod according to any one of claims 1 to j, wherein the number of threads of the multi-thread screw is 2 to 4, and the electrode rod can be threadedly connected by a slight rotation.