KR20020060576A - Grinding machine for welding electrodes - Google Patents

Abstract

With one polishing plate and one electrode polishing machine, the tip of the electrode can be shaped to the final shape with high efficiency and high precision, and the head of the electrode can be polished to the mirror surface.

For that purpose, the electrode grinder is equipped with a body 1, a polishing motor 2, a polishing plate 3, a swing plate 4, a holder guide 6, an electrode holder 7, an electrode rotation motor 8, and a swing plate movement. It is comprised by the apparatus 9, and arrange | positions the shaft center (phi) of the electrode rod A along the line perpendicular | vertical to the axis line (phi) of the motor drive shaft 2a, and also the grinding | polishing part 3a of the grinding | polishing plate 3 ) Is formed in a shape corresponding to the final shape of the electrode A, and further, the polishing plate 3 is rotated by the polishing motor 2 and the electrode A is rotated by the electrode rotation motor 8. do.

Description

Electrode Polisher for Welding {GRINDING MACHINE FOR WELDING ELECTRODES}

The shape of the tip of the electrode in TIG welding or the like is closely related to the current density, current distribution, cooling effect, and the like of the welded portion, and greatly affects the efficiency of welding work and the quality of the welded product. For this reason, the tip of the electrode may be shaped appropriately according to the material, plate thickness, welding conditions, etc. of the electrode to be welded, for example, the sharp end of the tip, or the two-stage cut type having the tip and the tapered and flat surfaces. So-called ash head). In addition, the outer surface of the tip of the electrode rod finished in a predetermined shape is polished to a high smooth surface. For example, in a TIG welding tungsten electrode rod A having a diameter D of about 0.5 to 2.0 mmφ having the tip A as a spherical head A ₀ having a radius of R = 0.08 to 0.1 mm, the spherical surface of FIG. It is preferable that the outer surface of the head A _{0 of the} phase is polished to a smoother surface than the outer surface of the tapered portion A ₁ , so as to be a so-called mirror surface outer surface. This is because, by making the outer surface of the spherical head portion A ₀ mirror, the generation of the arc becomes easier, and the directivity and stability of the arc are greatly improved.

By the way, the grinding | polishing process of the front-end | tip of the said electrode A is normally performed using the exclusive electrode rod polishing machine. Specifically, using an electrode polishing machine having a structure as shown in Fig. 13 disclosed in Japanese Utility Model Laid-Open No. Hei 4-60386, Japanese Patent Application Laid-Open No. Hei 7-276211, and the like, ( ₁ ) First, a polishing plate B ₁ having a relatively rough particle size (Example For example, after attaching the polishing plate of # 170 to the motor drive shaft M ₁ and shaping the tip of the electrode A into a predetermined shape, the polishing plate B ₁ is polished to a fine grain B ₂ (example: For example, replace with a # 500 grinding wheel) and regrind the tip of the electrode rod shaped by this grinding panel B ₂ (called the first method), or attach the abrasive disk B ₁ having a dry particle size. After preparing one electrode grinder and two electrode grinders having a fine grain B ( ₂ ), and forming the tip portion into a predetermined shape with the former electrode grinder, the electrode tip grinder is polished with the latter electrode grinder. (Called the second method) It is.

In Fig. 13, C is a case body, M is a grinding motor, D is a polishing plate fixing screw, E is a dust cover, and F is an electrode guide.

However, in the first method, there is a problem yeonmaban (B _1, B ₂₎ that the rapidly perform grinding efficiently because andoegi If no replacement of two or more.

In addition, in the second method, since two electrode polishing machines are required, economical efficiency is lowered, and labor such as maintenance is increased.

Further, when the switching to the polishing by yeonmaban (B ₂₎ of the fine grain size from the polishing by yeonmaban (B ₁₎ of the coarse particle size, it is much to the position of the central axis of the electrode (A) contrary, the so-called electrode (A It is difficult to maintain concentricity. As a result, not only it takes time to polish the tip end to mirror, but there is a problem that the shape of the tip end changes.

The present invention has a problem in the above-described problems in the polishing of the electrode tip for welding of this kind, i.e., in the case of replacing and replacing the abrasive grain having a rough grain size and the abrasive grain having a small particle size, it is difficult to replace the abrasive grain. Problems such as difficulty in maintaining the concentricity of the electrode rods before and after the replacement of the polishing plate, (2) the difficulty in maintaining the concentricity of the electrode rods when the two polishing machines are used, and the economical efficiency is low. In order to solve the problem, even with a single electrode polisher, even for a very short electrode, it is possible to form the tip of the electrode in a predetermined shape with high efficiency by simple operation, and for welding only the head of the electrode can be polished in mirror shape. It is to provide an electrode polishing machine.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a polishing machine for polishing a tip of a welding electrode rod such as tungsten, molybdenum, chromium copper, etc. used in TIG welding, plasma arc welding, or the like into a predetermined shape.

1 is a plan view of an electrode polishing machine for welding according to the present invention,

2 is a side view of an electrode polishing machine for welding;

3 is a front view of an electrode polishing machine for welding;

4 is a longitudinal side view showing the main portion of the electrode polishing machine for welding;

5 is a vertical front view showing the main part of an electrode polishing machine for welding;

6 is a cross-sectional view of the polishing plate,

7 is a cross-sectional view of the electrode holder,

8 is an explanatory diagram of an electrode polishing amount setting gauge;

9 is a sectional view of a polishing plate according to a second embodiment;

10 is a sectional view of the polishing plate according to the third embodiment,

11 is a sectional view of a polishing plate according to a fourth embodiment;

12 is a view showing an example of the shape of the tip portion of the tungsten electrode for TIG welding;

It is a figure which shows an example of the conventional electrode grinder.

<Description of Symbols for Major Parts of Drawings>

A: electrode φ: axis of motor drive shaft

φa: Axis A of electrode rod A ₁ : Taper portion of electrode rod

A ₀ : tip end of electrode 1a: case body

1b: Dust cover 1c: Fixture

1d: handle 1e: bushing

1f: border plate 1g: dust case

1h: support member 1i: long hole

1j: storage hole 2: polishing motor

2a: drive shaft 2b: polishing plate holder

3: grinding wheel 3A: grinding part

3a: 1st polishing part 3b: 2nd polishing part

3a ₁ · 3b _1: longitudinal slope 3a ₂ · 3b _2: horizontal slope

3b ': abrasive groove 3c: base material

4 swing plate 4a support shaft

4b: gauge stopper 4c: screw

4d: bushing mounting hole 5: cylindrical bushing

6: Holder Guide 6a: Flange

6b: pulley 7: electrode holder

7a: Chuck Guide 7b: Collet Chuck

7c: chuck screw 8: electrode rotating motor

8a: drive shaft 9: swing plate moving device

9a: Movement handle 9b: Worm gear

9c: Worm gearbox 10: Dial gauge

10a: driving body 11: electric control device

12: Polishing amount setting gauge 12a: Case body

12b: Nut 12c: Bolt for Set

13: Polishing plate fixing screw 14: Polishing motor switch

15: round rubber belt 16: spacer

17: drive pulley 18: switching limit switch

In order to solve the above problems, the welding electrode polishing machine of claim 1 is provided in a box-shaped main body 1, a polishing motor 2 fixed in the main body 1, and a motor drive shaft 2a of the polishing motor 2. A disk-shaped polishing plate 3 having an attached polishing portion 3A, which is located above the polishing plate 3, is installed on the main body 1, and moves in the direction of the axis φ of the motor drive shaft 2a. A cylindrical holder guide (6) rotatably supported on the swing plate (4) and the swing plate (4) supported by the support plate in a vertically-oriented position, and projecting the lower portion onto the polishing plate (3) in the main body (1). And an electrode holder (7) detachably inserted into and attached to the holder guide (6) to detachably fix the electrode rod (A) in a state in which its tip is in contact with the polishing portion (3A), and the main body (1). An electrode rotating motor 8 fixed inside the electrode holder for rotating the holder guide 6 inserted with the electrode holder 7 attached thereto, and the swing plate It provided that the agent (4) to swing the plate moving device 9 to move as the axis (φ) a distance (l) according to the motor drive shaft (2a) to the basic configuration of the invention.

In the invention of claim 2, in the invention of claim 1, the polishing portion 3A of the polishing plate 3 includes the first polishing portion 3a made of coarse abrasive grains, and the second polishing portion made of fine abrasive grains. It is set as the structure provided with 3b).

According to a third aspect of the present invention, in the invention of claim 1, the first polishing portion for shaping the polishing portion 3A of the polishing plate 3 into a conical shape at the front end of the electrode A is formed on the front surface of the disk and further conically shaped. a tip head portion (a ₀₎ of the electrode, a second polishing portion (3b) provided on the outer peripheral surface of the V-shaped grinding groove (3b ') for polishing the surface around the outer peripheral surface of the disc, to one with a configuration having respectively.

According to the invention of claim 1, in the invention of claim 1, the polishing part 3A of the polishing plate 3 is formed by the first polishing part 3a which forms the tip of the electrode A into a conical shape, and the electrode rod shaped into a conical shape. the front end is a head portion (a ₀₎ the second polishing section (3b) of the abrasive as a mirror with configurations each having a front surface side of the disc.

In the invention of claim 5, in the invention of claim 4, the first polishing portion 3a is provided at the radially inner side of the disk and at the outer side in the thickness direction, and the second polishing portion 3b is the disk. It is to be installed at the radially outer side of the inner side in the thickness direction.

According to the invention of claim 6, in the invention of claim 5, the angle α ₁ of the longitudinal inclined plane and the horizontal inclined plane that form the first polishing part 3a and the second polishing part 3b, respectively, are the angle α ₂ . And the radius R of the arc-shaped connection portions of both inclined surfaces are the same in the first polishing portion 3a and the second polishing portion 3b, respectively.

In the invention of claim 1, in the invention of claim 1, the polishing portion 3A of the polishing plate 3 is formed integrally with abrasive grains having a medium particle size.

According to the invention of claim 8, in the invention of claim 7, the longitudinally inclined surface 3a ₁ for forming the polishing portion 3A of the polishing plate 3 into a conical shape of the tip of the electrode rod A, and the transversely inclined surface for discharging abrasive powder. (3a ₂₎ and, to a front end of the head (a ₀₎ of the electrode (a) to be provided with a curved surface (3a ₃₎ for polishing the surface of the semi-spherical diameter.

In the invention of claim 9, in the invention of claim 1, the polishing portions 3A of the polishing plate 3 are formed symmetrically on both sides of the substrate of the polishing plate 3.

In the invention of claim 10, in the invention of claim 1, the swing plate 4 is axially rotatably supported by the upper wall of the main body 1, and the other end is the axis φ of the motor drive shaft 2a. The configuration is movable in the direction.

The invention of claim 11 is, in the invention of claim 1, a collet chuck (7b) for inserting the electrode holder (7) into the cylindrical chuck guide (7a), the tip side of the chuck guide (7a), It is to be composed of a cylindrical chuck screw (7c) that is inserted from the proximal end of the chuck guide (7a) and the tip is screwed to the collet chuck (7b).

In the invention of claim 11, in the invention of claim 11, a spacer 16 having a predetermined thickness h is inserted into and attached to the chuck guide 7a of the electrode holder 7, and the tip of the electrode rod A is attached. The head A ₀ is positioned in the polishing groove 3b 'of the second polishing portion 3b.

According to the invention of claim 13, in the invention according to claim 1, the holder guide 6 into which the electrode holder 7 is inserted and attached is rotated by the electrode rotation motor 8 through the round rubber belt 15. will be.

According to the invention of claim 14, in the invention of claim 1, the swing plate moving device (9) is rotated by the moving handle (9a) and the handle (9a) and fits with a screw (4c) provided on the swing plate (4). Physics is to be composed of a worm gear (9b).

According to the invention of claim 14, in the invention of claim 14, the moving distance l of the electrode rod holder 7 by the swing plate moving device 9 is linked to the gauge stopper 4b provided on the swing plate 4. It is set as the structure shown by the dial gauge 10 provided with the drive body 10a.

EMBODIMENT OF THE INVENTION Hereinafter, embodiment of this invention is described based on drawing.

1 is a plan view of the electrode polishing machine for welding according to the present invention, FIG. 2 is a side view, FIG. 3 is a front view, FIG. 4 is a vertical side view, and FIG. 5 is a vertical front view.

The electrode polishing machine for welding of the present invention includes a box-shaped body 1, a polishing motor 2 housed inside the body 1, a polishing plate 3 rotated at high speed by the polishing motor 2, Swing plate 4 provided on the upper part of the front part of the main body 1, the cylindrical bushing 5 fixed to the center part of the swing plate 4 in the longitudinal direction, and the cylindrical shape rotatably inserted into the bushing 5 An electrode rod motor for rotating the electrode holder 7 through the holder guide 6, the electrode holder 7 detachably inserted into the holder guide 6 in a vertically facing position, and the holder guide 6. 8), the swing plate moving device 9 for moving one end side of the swing plate 4 supporting the electrode holder 7, and the electrode rod holder 7 inserted into and attached to the swing plate 4; Dial gauge 10 for displaying the electric control device 11 for controlling the driving of the polishing motor 2 and the electrode rotating motor 8 and the like. And a dresser (not shown) for cleaning the polishing surface of the polishing plate 3 for setting the polishing amount of the electrode rod, and the like, as the accessories.

The main body 1 is formed in a box shape, formed of a case body 1a made of steel or plastic with an open front face, and a dustproof cover 1b made of a transparent plastic covering the front opening. The fastener 1c, handle 1d, bushing 1e, etc. of (1b) are provided.

Moreover, the inside of the case main body 1a is partitioned off by the boundary plate 1f, and the dust case 1g is inserted in the lower part of the partition of the front part so that insertion and insertion are possible.

Moreover, in the compartment of the rear part of the case main body 1a, fixing support members 1h, such as each motor 2 and 8, are provided.

In the central portion of the upper wall of the front compartment of the case body 1a, a long hole 1i for inserting a tubular bushing 5, a holder guide 6, and the like described later is formed, and one side wall of the rear compartment is provided. The storage hole 1j of the polishing amount setting gauge 12 is provided.

The polishing motor 2 is attached to the support member 1h in a horizontal state, and the motor drive shaft 2a penetrates through the boundary plate 1f to the upper side of the front dust case 1g of the case body 1a. It protrudes.

Further, a polishing plate holder 2b is fixed to the motor drive shaft 2a, and the polishing plate 3 is detachably fixed to the motor drive shaft 2a by a fixing screw 13 with the lead polishing plate holder 2b.

In the present embodiment, a single-phase AC motor of 100 V, 50/60 kW, or 100 W is used as the polishing motor 2, and the predetermined predetermined time is set by the electric control device 11 by turning on the switch 14 for the polishing motor. Time runs, after which it is automatically stopped by a timer switch.

(First Embodiment of Polishing Board)

As shown in FIG. 6, the polishing plate 3 is formed into a disk shape having a diameter of about 60 mm phi and a thickness of about 8.2 mm, and is fitted into an end portion of the front end of the polishing plate holder 2b. It is matched and fixed by the grinding board fixing screw 13.

The polishing plate 3 is formed of a first polishing portion 3a made of relatively coarse diamond abrasive grains, and a second polishing portion 3b made of relatively fine diamond abrasive grains, and the first polishing portion 3a A longitudinal inclined surface 3a ₁ having an inclination of an angle α ₁ = about 10 ° with respect to a line perpendicular to the axis φ of the motor drive shaft 2a, and an angle of α ₂ = about 20 ° with respect to the axis φ. It is formed of the horizontal inclined surface 3a ₂ which has inclination, and the intersection P of both is formed in the curved surface of radius R = about 0.08 mm.

Further, the second polishing section (3b) of yeonmaban (3) is formed on the outer peripheral end of the first polishing section (3a), vertical continuous to the vertical inclined face (3a ₁₎ of the first polishing section (3a) The inclined surface 3b ₁ is provided. In addition, a V-shaped abrasive groove 3b 'having a depth of about 1.2 mm having an opening angle of inclination angle α ₃ = about 10 ° with respect to a line perpendicular to the axis φ is provided on the outer circumferential surface of the second polishing portion 3b. It is.

In the present embodiment, the first abrasive portion 3a is formed of relatively rough diamond abrasive grains of about # 170, and the second abrasive portion 3b is formed of relatively fine diamond abrasive grains of about # 500. have.

The distance l between the intersection point P and the center of the polishing groove 3b 'is about 2.5 mm, and the distance h between the intersection point P and the bottom surface of the polishing groove 3b' is It is set to about 3.8 mm, respectively (in the case of 2.0 mm diameter of outer diameter of electrode A).

1 to 5, the swing plate 4 is installed on the upper wall in front of the case body 1a, and one end side thereof is movable in the arrow direction of FIG. 1 by the support shaft 4a. It is axially supported.

On the other end side of the swing plate 4, a gauge stopper 4b is placed upright, and the tip end of the drive body 10a of the dial gauge 10 is in contact with this.

Further, a screw 4c is formed on the other end side of the swing plate 4, and the screw 4c is engaged with the worm gear 9b of the swing plate moving device 9 described later.

A bushing attachment hole 4d is drilled in the center of the swing plate 4, and a short cylindrical bushing 5 for rotatably supporting the electrode holder 7 is inserted into the hole 4d. Moreover, the upper end part of this cylindrical bushing 5 is being fixed to the swing plate 4.

Inside the short cylindrical bushing 5, a short cylindrical holder guide 6 is rotatably inserted from above. In other words, the holder guide 6 is rotatably supported in a vertically facing position with the flange portion 6a of its upper end coupled to the upper end surface of the bushing 5.

The holder guide 6 is for detachably fixing the electrode holder 7, and has a cylindrical shape as shown in FIG. 4. As described above, the holder guide 6 is rotatably supported by the swing plate 4 in a vertically facing position via the bushing 5, and the electrode holder 7 into the holder guide 6. Is detachably inserted and fixed.

In addition, a driven pulley 6b is formed below the holder guide 6, and between the driven pulley 6b and the drive pulley 17 attached to the drive shaft 8a of the electrode rotating motor 8. The rubber belt 15 is wound around.

The electrode holder 7 is for detachably holding and fixing the electrode A, and holds the electrode A in a state in which the tip side contacts the first polishing portion 3a of the polishing plate 3. .

As shown in Fig. 7, the electrode holder 7 has a cylindrical chuck guide 7a detachably inserted into the holder guide 6 and a collet chuck 7b inserted at the distal end of the chuck guide 7a. ) And a cylindrical chuck screw (7c) inserted into the proximal end of the chuck guide (7a) and screwed to the collet chuck (7b), the chuck screw (7) through the electrode bar (A) to the collet chuck (7b) When 7c) is fastened, the collet chuck 7b is reduced in diameter, and the electrode A is held and fixed to the collet chuck 7b.

In addition, the collet chuck 7b is prepared in a variety of different inner diameters of the electrode insertion hole, and in this embodiment, the collet chuck 7b corresponds to the electrode rod A having an outer diameter of 1.0 mm to 2.6 mm by replacing the collet chuck 7b. Is made possible.

In addition, as shown in FIG. 7, the spacer 16 is detachably inserted and attached to the chuck guide 7a. As described later, the tip head A is formed after the tip shaping of the electrode A. FIG. The spacer 16 is used in the case of polishing the mirror surface ₀ by the second polishing portion 3b.

The electrode rotating motor 8 is disposed in the rear portion of the main body case 1a and is fixed to the supporting member 1h.

In addition, a drive pulley 17 is fixed to the drive shaft 8a of the electrode rotating motor 8, and a round rubber belt is provided between the drive pulley 17 and the driven pulley 6b of the holder guide 6. (15) is wound.

That is, by rotating the motor 8, the holder guide 6 is rotationally driven through the round rubber belt 15, and as a result, the electrode holder 7 detachably fixed to the holder guide 6 and fixed thereto. The electrode rod A is rotated.

The swing plate moving device (9) includes a moving handle (9a), a worm gear (9b) rotated by the moving handle (9a), and a tip screw (4c) of the swing plate (4) engaged with the worm gear (9b). And the worm gear box 9c and the like, and the swing plate 4 is moved in the direction of the arrow with the support shaft 4a as the point through the worm gear 9b by rotating the moving handle 9a.

In addition, when the swing plate 4 moves in the direction of the arrow, the electrode holder 7 which is processed in the swing plate 4 is also integrally moved, and the tip position of the electrode A is moved along the axis line of the motor drive shaft 2a. φ) direction.

The movement amount of the swing plate 4 due to the rotation of the movement handle 9a is read by the dial gauge 10. That is, when the dial gauge drive body 10a in contact with the gauge stopper 4b on the swing plate 4 moves in the direction of the arrow, the movement amount of the swing plate 4 is displayed on the dial gauge 10.

In addition, since the structure of the dial gauge 10 is well-known, the description is abbreviate | omitted here.

The electric control device 11 is for controlling the starting and stopping of the polishing motor 2 and the electrode rotating motor 8, and by turning on the polishing motor switch 14, the predetermined time and predetermined speed are predetermined. Rotate both motors (2, 8).

In the case where the tip of the electrode A is mirror polished using the second polishing portion 3b of the polishing plate 3, the two limiting switches 18 The rotation speed is switched to the high speed side, and both motors 2 and 8 are rotated at a predetermined speed for a predetermined time.

The electrode polishing amount setting gauge 12 sets the polishing amount of the electrode rod A by adjusting the protrusion amount of the electrode rod A held by the electrode holder 7, and is detachable from the side wall of the case body 1a. Is housed.

As shown in Fig. 8, the polishing amount setting gauge 12 is a cylindrical gauge body 12a, a nut 12b fixed to the distal end of the gauge body 12a, and a set screwed into the nut 12b. The electrode rod A from the electrode holder 7 by inserting the electrode holder 7 into the gauge body 12a and bringing the tip of the electrode A into contact with the bolt 12c. Adjust the amount of protrusion.

When the polishing amount is set by the polishing amount setting gauge 12, first, the electrode A is held and fixed in the state where the tip portion is protruded by the electrode holder 7 by a predetermined length. Next, the electrode holder 7 is inserted into the holder guide 6 and subjected to test polishing by the first polishing portion 3a of the polishing plate 3 to determine whether the tip of the electrode A is polished in a perfect cone shape. Check. If the electrode rod A is completely polished, the electrode holder 7 holding the electrode rod A is inserted into the gauge body 12a, and the gap between the tip of the electrode rod A and the tip of the set bolt 12c. The set bolt 12c is moved and adjusted to be a predetermined value (for example, 0.5 mm). The polishing amount of the electrode A from the next time is regulated by the gap length.

Next, the case where the electrode A is polished using the electrode polishing machine of the present invention will be described.

First, the polishing plate 3 adapted to the diameter of the electrode A and the tip shape to be polished is selected, and this is fixed to the motor drive shaft 2a.

Next, the electrode rod A is inserted into the collet chuck 7b of the electrode holder 7 and the electrode rod A is protruded by a predetermined length (45 mm to 50 mm) from the tip of the collet chuck 7b. Lightly tighten the chuck screw 7c to keep the electrode A in a slidable state.

Then, the electrode holder 7 holding the electrode A is inserted into the case body 12a of the polishing amount setting gauge 12, and the tip of the electrode A is brought into contact with the set bolt 12c to collet the chuck. When the electrode rod holder 7 is fully inserted into the case body 12a by inserting it into the 7b, the chuck screw 7c is completely tightened to fix the electrode rod A. As a result, the amount of protrusion and polishing of the electrode rod A is set. In addition, of course, the position of the set bolt 12c of the grinding | polishing amount setting gauge 12 is adjusted to a predetermined position by performing the test polishing of the electrode rod A as mentioned above.

Subsequently, the electrode holder 7 is inserted into the holder guide 6, the tip of the electrode A is brought into contact with the first polishing portion 3a of the polishing plate 3, and the switch 14 is turned on.

Thereby, while the electrode A rotates, the tip part contacts the 1st grinding part 3a of the grinding | polishing plate 3, and it grind | polishes in order. At this time, when polishing of the electrode A proceeds, the electrode holder 7 descends by the weight of the electrode holder 7 according to its own weight. As a result, the tip of the electrode A is automatically polished in a conical shape. Going. In addition, when the electrode holder 7 is lowered by a certain amount, the handle portion of the chuck guide 7a contacts the upper surface of the holder guide 6 so that the lowering is restricted.

When fixed polishing is performed for a predetermined time, the motors 2 and 8 are automatically stopped by a timer to complete the fixed polishing. In addition, when orthopedic polishing is completed, the electrode holder 7 is removed from the holder guide 6 and the spacer 16 is inserted into the electrode holder 7 and attached thereto.

Next, while rotating the movement handle 9a of the swing plate moving device 9 to make the dial gauge 10, the position of the center axis of the holder guide 6 is moved to the inside of the main body 1 by a predetermined distance l. Move to. As a result, in the case where the electrode holder 7 is inserted into the holder guide 6 and attached thereto, the tip of the electrode rod A held thereon is positioned just above the second polishing portion 3b of the polishing plate 3. do.

After the movement of the swing plate 4 is completed, the spacer 16 is inserted into and attached to the chuck guide 7a of the electrode holder 7, and the electrode holder 7 to which the spacer 16 is inserted and attached is attached to the holder. Insert into the guide (6) and attach.

The thickness of the spacer 16 is set to the dimension h as described above. As a result, the tip of the shaped electrode A held by the electrode holder 7 is placed on the V-shaped abrasive groove 3b 'of the second polishing portion 3b.

Under this condition, when the motor switch 14 is turned on again, the polishing plate 3 and the holder guide 6 are rotated at a high speed at a predetermined speed for a predetermined time, and the electrode holder 7 is about 1.2 by its own weight. Mm down. As a result, the vicinity of the spherical portion at the tip of the electrode rod A is polished to the mirror surface by the second abrasive portion 3b of fine grain size.

In addition, when the swing plate 4 moves, the switching limit switch 18 is operated, and the rotation speeds of the two motors 2 and 8 are automatically switched to high speed operation, whereby the front spherical surface of the electrode A is rotated. The shape is finished to mirror surface with higher efficiency.

(2nd Example of Polishing Board)

9 shows a second embodiment of the polishing plate 3. The polishing plate 3 according to the second embodiment is formed in a disk shape having a diameter of about 60 mm φ and a thickness of about 8.2 mm, similarly to the polishing plate 3 of the first embodiment shown in FIG. It is fitted to the end of the front end portion and fastened to the polishing plate holder 2b by a fixing screw 13.

As is apparent from Fig. 9, the abrasive disc 3 is composed of a first abrasive disc 3a made of relatively coarse diamond abrasive grains of about # 170 and a second abrasive disc 3b made of relatively fine diamond abrasive particles of about # 500. Both of the first polishing board 3a and the second polishing board 3b are formed in different shapes on the front side of the disk, respectively.

That is, the first polishing plate 3a is disposed radially inward of the front side of the disc and located outward in the thickness direction, and has an angle α ₁ with respect to a line perpendicular to the axis φ of the motor drive shaft 2a. = A longitudinal inclined surface 3a ₁ having an inclination of about 10 degrees, and an angle α ₂ with respect to the axis φ, and a transverse inclined surface 3a ₂ having an inclination of about 20 degrees, and forming a circle on both inclined surfaces. The arc-shaped connection part P is formed in the curved surface of radius R = about 0.08 mm.

The second polishing portion 3b is disposed radially outward from the first polishing portion 3a and inward in the thickness direction, and has a longitudinal inclined surface 3b ₁ having an angle α ₁ = about 10 °. And the lateral inclined surface 3b ₂ having an angle α _{2 of} about 20 °, and both arc-shaped connecting portions Q are formed in a curved surface having a radius R of about 0.08 mm.

Further, the distance l in the disk thickness direction (the driving shaft direction of the polishing motor) between the arc-shaped connecting portion P of the first polishing portion 3a and the arc-shaped connecting portion Q of the second polishing portion 3b is about 2.5. In addition, the distance h of the radial direction is set to about 3.8 mm, respectively (when the outer diameter of the electrode A is 2.0 mmphi).

In the second embodiment, the angles α ₁ and α ₂ and the radius R of the first polishing portion 3a and the second polishing portion 3b are the same. It goes without saying that the angles α ₁ , α ₂ and the radius R of (3a, 3b) may be set to different values, respectively.

In the second embodiment, the distance l and the distance h are the same as in the first embodiment, but the distances l and h of the second embodiment may be changed as appropriate. Of course.

The polishing method of the electrode rod A using the polishing plate 3 of the second embodiment is the same as the case of using the polishing plate 3 of the first embodiment. Therefore, detailed description thereof will be omitted here.

In addition, in the case of the polishing plate 3 of the second embodiment, the second polishing portion 3b is not a V-shaped groove as in the case of the first embodiment, and the front surface is opened wide, so that the second polishing plate 3b Blockage rarely occurs. As a result, the labor required for the maintenance management of the polishing plate 3 can be greatly reduced.

(Third Embodiment of Polishing Board)

FIG. 10 shows a third embodiment of the polishing plate 3, and as shown in FIG. 10, the polishing plate 3 is formed into a disk shape having a diameter of about 60 mm phi and a thickness of about 8.2 mm and rough. It is integrally formed by diamond abrasive grains (abrasives) of medium particle size (eg # 350) which are approximately intermediate between the particle size (eg # 170) and the fine particle size (eg # 500). It fits in the edge part of the front side of the holder 2b, and is fixed by the grinding-panel fixing screw 13.

The polishing plate 3 has a polishing portion 3A for polishing the tip end portion of the electrode bar A. The polishing portion 3A is formed in a polishing shape corresponding to the final shape of the tip end portion of the electrode bar A shown in FIG. It is.

As a result, the grinding portion 3A has an inclination of an angle α ₁ = about 10 ° with respect to the line perpendicular to the axis φ of the motor drive shaft 2a, and has a longitudinal inclined surface conical to shape the tip of the electrode A in a conical shape ( 3a ₁ ), the intersection between the inclined surface 3a ₂ for discharging abrasive powder and the like having an angle α ₂ = about 20 ° with respect to the axis φ of the motor drive shaft 2a and the radius R of It is formed into a curved surface 3a ₃ which becomes a circular arc shape of about 0.08 mm and polishes the tip head A ₀ of the electrode A to a mirror surface (when the outer diameter D of the electrode A is 2.0 mmφ). ).

On the occasion of polishing, as in the case of the first embodiment, the electrode holder 7 is inserted into the holder guide 6 and the tip of the electrode A is brought into contact with the polishing portion 3A of the polishing plate 3. The motor switch 14 is turned on.

Then, the polishing plate 3 is rotated around the axis φ by the polishing motor 2, and the electrode A is rotated around the axis φa by the electrode rotation motor 8.

Thereby, while the electrode A rotates, the tip part contacts the grinding | polishing part 3A of the grinding | polishing plate 3, and is polished one by one. At this time, when the polishing of the electrode rod A proceeds, the electrode holder 7 descends by itself according to the weight of the electrode holder 7. As a result, the tip portion of the electrode rod A is removed from the polishing plate 3. The tip head of the electrode A is polished to a hemispherical mirror surface by the curved surface 3a ₃ of the polishing plate 3 while being automatically conical shaped by the longitudinally inclined surface 3a ₁ .

This arrange | positions the shaft core (phi) of the electrode rod A along the line perpendicular | vertical to the axis line (phi) of the motor drive shaft 2a, and arrange | positions the grinding | polishing part 3A of the grinding | polishing plate 3 of the electrode rod A. This is because the polishing bar 3 is rotated by the polishing motor 2 and the electrode A is rotated by the electrode rotating motor 8 while the polishing plate 3 is formed in a polishing shape corresponding to the final finish shape.

When the electrode holder 7 is lowered by a certain amount, the handle portion of the chuck guide 7a contacts the upper surface of the holder guide 6 to regulate the lowering.

When polishing is performed for a predetermined time, the motors 2 and 8 are automatically stopped by the timer switch and polishing is completed. Therefore, the electrode holder 7 is removed from the holder guide 6 and the electrode rod from the electrode holder 7 at the same time. Remove (A). As a result, as shown in Fig. 12, the tip portion becomes a conical tapered portion A ₁ , the head A ₀ becomes hemispherical, and the outer surface A mirror electrode rod A can be obtained.

In the case of polishing the electrode rods A of different outer diameters or adjusting the polishing amount of the electrode rods A, a predetermined distance is observed while rotating the moving handle 9a of the swing plate moving device 9 while looking at the dial gauge 10. By this, the position of the center axis line of the holder guide 6 is moved in the direction of the axis line φ of the motor drive shaft 2a, and the degree of contact between the electrode rod A and the polishing plate 3 is adjusted.

In addition, although the grinding | polishing part 3A of the grinding | polishing plate ₃ was equipped with the longitudinally inclined surface 3a ₁ and the curved surface 3a ₃ in response to the electrode rod A of FIG. 12 in the previous example, it is not limited to this. For example, when the tip end of the electrode A is a so-called two-stage conical shape composed of two tapered surfaces having different angles, the two ends may be provided with two longitudinal inclined surfaces.

(Fourth Embodiment of Grinding Board)

FIG. 11 shows a fourth embodiment of the polishing plate 3, and the polishing portions 3A on both sides of the polishing portion 3A according to the third embodiment shown in FIG. 10 are symmetrically combined on both sides of the substrate 3c. It is to be used interchangeably.

In addition, since the grinding | polishing by the said grinding | polishing plate 3 is the same as that of the grinding | polishing plate 3 of 3rd Example, the description is abbreviate | omitted.

(Effects of the Invention)

a. In the present invention, the axis of the electrode rod is arranged along a line perpendicular to the axis of the motor drive shaft, the polishing portion of the polishing plate is formed into a polishing shape corresponding to the final shape of the electrode rod, and the polishing plate is rotated by the polishing motor. At the same time, the polishing rod is rotated by the electrode rotating motor. Therefore, the tip of the electrode can be shaped into a final shape with high efficiency and high precision with one polishing plate and one electrode polishing machine, and the head of the electrode can be polished to the mirror surface.

b. In the present invention, the polishing plate (3) is a composite polishing plate (3) having a first abrasive portion (3a) having a fine particle size and a second abrasive portion (3b) having a fine particle size, and a swing plate moving device. (9) moves the swing plate (4) rotatably supporting the electrode holder (7), and the front end of the electrode (A) to both the first polishing portion (3a) and the second polishing portion (3b) It is set as the structure to grind by.

As a result, the tip of the electrode rod is shaped by the first abrasive portion 3a of the relatively coarse abrasive grain, and only the tip head A ₀ is mirror-polished by the second abrasive portion 3b of the relatively fine abrasive grain. In this way, the tip of the electrode can be polished with high efficiency.

In addition, while the electrode A is held by the same electrode holder 7, the same electrode polishing machine is used to perform the normal polishing of the tip of the electrode and the mirror polishing of the tip head A ₀ . Even when switching to the suspension, no disruption is generated at the axial position of the electrode A, and accurate mirror polishing of the leading head A ₀ can be performed with high efficiency.

c. In the present invention, the electrode holder (7) can be moved exactly by a predetermined distance (l) while looking at the dial gauge (10) by the swing plate moving device (9), and the rubber rounded to transmit the rotational driving force of the electrode (A). Since the belt 15 is used, the variation of the distance l is absorbed well by the expansion and contraction. As a result, the electrode holder 7 is smoothly rotated and driven.

d. Only by inserting and attaching the spacer 6 to the electrode holder 7, the height position of the tip head A ₀ of the electrode A when performing mirror polishing can be adjusted to a predetermined position. Only (A ₀ ) can be accurately polished to mirror surface.

e. In the present invention, the polishing plate is made of an abrasive of the same particle size (medium particle size), and the polishing portion is formed in a shape conforming to the final shape of the electrode. As a result, manufacturing becomes easy and the cost can be reduced.

f. In the present invention, since the shaft center of the electrode is arranged along a line perpendicular to the axis of the motor drive shaft, the structure is greatly simplified and the cost can be reduced, compared to the inclination of the polishing plate or the inclination angle of the electrode. We can plan.

g. In the present invention, since the electrode holder is moved by the swing plate moving device while watching the dial gauge, the position of the electrode with respect to the polishing plate can be adjusted very accurately.

Claims (15)

Disc shaped polishing plate 3 having a box-shaped body 1, a polishing motor 2 fixed in the body 1, and a polishing portion 3A attached to the motor drive shaft 2a of the polishing motor 2; ), A swing plate 4 positioned above the polishing plate 3 and mounted on the main body 1 and supported to be movable in the direction of the axis φ of the motor drive shaft 2a, and a swing plate 4. ) Is rotatably supported in a vertically facing posture, and is detachably inserted into the holder guide 6 and a cylindrical holder guide 6 which protrudes the lower portion onto the polishing plate 3 in the main body 1. And an electrode rod holder 7 for detachably fixing the electrode rod A in a state in which the tip thereof contacts the polishing portion 3A, and fixed in the main body 1 to insert and attach the electrode rod holder 7. Electrode rod motor 8 for rotating holder guide 6 and the swing plate 4 are moved by a predetermined distance l along the axis φ of the motor drive shaft 2a. Electrode polishing machine for welding, characterized in that consisting of a swing plate moving device (9). 3. The polishing portion 3A of the polishing plate 3 is configured to include a first polishing portion 3a made of coarse abrasive grains and a second polishing portion 3b made of fine abrasive grains. Electrode polishing machine for welding, characterized in that. The tip head of the electrode rod according to claim 1, wherein the first polishing portion for forming the polishing portion 3A of the polishing plate 3 into a conical shape at the tip end of the electrode A is formed on the front side of the disk and in a conical shape. A electrode polishing machine for welding, characterized in that a second polishing portion (3b) having a V-shaped polishing groove (3b ') for mirror polishing A ₀ ) is provided on the outer peripheral portion of the disk, respectively. According to claim 1, wherein yeonmaban (3) polishing section (3A) of the first polishing section (3a) and the front end of the electrode shaped as a conical head for shaping the distal end of the electrode (A) in a cone of the (A ₀₎ The electrode polishing machine for welding characterized by including the 2nd grinding part (3b) which grind | polishs in the mirror surface on the front surface side of a disk, respectively. 5. The method according to claim 4, wherein the first polishing portion 3a is provided at a radially inner side of the disk and at an outer side in the thickness direction, and the second polishing portion 3b is radially outer of the disk and in the thickness direction. Electrode polishing machine for welding, characterized in that to be installed in the inner position of the. The angle α ₁ of the longitudinal inclined plane, α ₂ of the transverse inclined plane, and the arc-shaped connecting portions of both inclined planes according to claim 5, wherein the first inclined surface 3a and the second inclined surface 3b respectively form an angle α ₁ . The electrode polishing machine for welding, characterized in that the radius R is the same in the first polishing portion 3a and the second polishing portion 3b, respectively. An electrode polishing machine for welding according to claim 1, wherein the polishing portion (3A) of the polishing plate (3) is formed integrally with abrasive grains of medium particle size. The method of claim 7, yeonmaban (3) polishing section (3A) for, vertical inclined surface (3a _1), and transverse slope for discharging the grinding dust (3a ₂₎ and for shaping the distal end of the electrode (A) in a cone of, An electrode polishing machine for welding, comprising: a curved surface (3a ₃ ) for polishing the tip head (A ₀ ) of the electrode (A) into a hemispherical mirror surface. The electrode polishing machine for welding according to claim 1, wherein the polishing portion (3A) of the polishing plate (3) is formed symmetrically on both sides of the substrate of the polishing plate (3). 2. The swing plate (4) according to claim 1, wherein the swing plate (4) is axially rotatably supported at an upper wall of the main body (1), and the other end is movable in an axis (φ) direction of the motor drive shaft 2a. Electrode polishing machine for welding. 2. A cylindrical chuck guide (7a), a collet chuck (7b) for inserting the electrode holder (7) at the distal end side of the chuck guide (7a), and a proximal end of the chuck guide (7a). An electrode polishing machine for welding, comprising: a cylindrical chuck screw (7c) inserted and screwed to a collet chuck (7b). The method of claim 11, wherein the chuck guide (7a), the tip head portion (A ₀₎ of the attachment by inserting a spacer 16 for holding a given thickness (h), the electrode (A) on the electrode holder (7) Electrode polishing machine for welding, characterized in that located in the polishing groove (3b ') of the second polishing portion (3b). The electrode electrode for welding according to claim 1, wherein the holder guide (6) inserted with the electrode holder (7) attached thereto is rotated by the electrode rotating motor (8) through a round rubber belt (15). Grinding machine. The swing plate moving device (9) according to claim 1, wherein the swing plate moving device (9) is rotated by the moving handle (9a) and the handle (9a) to the worm gear (9b) engaged with the screw (4c) installed on the swing plate (4). Electrode polishing machine for welding, which is configured. The driving body 10a according to claim 14, wherein the moving distance l of the electrode rod holder 7 by the swing plate moving device 9 is interlocked with the gauge stopper 4b provided on the swing plate 4. Electrode polishing machine for welding, characterized in that the configuration shown by the provided dial gauge (10).