JPH05308Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a dresser for an electrode tip of a resistance welding machine. The present invention relates to a dresser for an electrode tip of a resistance welding machine, which is configured to grind the tip of an electrode tip using a grinding section in which a cutting blade for grinding the side surface of the tip is attached to the holder.

[Background of the invention] For example, when welding the body of an automobile, a resistance welding machine is used. This resistance welding machine is the first
As shown in the figure, the welding point of the superimposed workpieces W ₁ and W ₂ is held between a pair of electrode tips 2a and 2b, and welding is performed by passing a large current between these electrode tips 2a and 2b. .

By the way, when the electrode tips 2a, 2b are repeatedly used for welding work, there arises a problem that the tip portions are deformed due to impact during welding or welding heat. In addition, some recent automobile bodies have surface treatments such as zinc plating to prevent rust, and when welding such works W ₁ and W ₂ ,
There is a possibility that a part of the processing material may be welded to the end surfaces 6a, 6b of the electrode chips 2a, 2b. In this case, the current density between the electrode tips 2a and 2b changes, causing the inconvenience that desired welding work cannot be performed.

Therefore, there is a chip dresser disclosed in Japanese Utility Model Publication No. 10789/1989 as a device for grinding the tips of the electrode tips 2a, 2b. This chip dresser has a grinding portion that grinds the tips of the electrode tips 2a, 2b which are clamped with the same pressure as during welding. In this case, the grinding section includes a first cutting edge section in which a cutting edge for grinding the end surface 6a and side surface 8a of the electrode chip 2a is integrated, and a cutting edge section for grinding the end surface 6b and side surface 8b of the electrode chip 2b is integrated. The electrode chip 2 is attached to the holder using the second cutting edge that has become
It is configured to simultaneously grind the ends of a and 2b.

However, the cutting blade part constituting the chip dresser has an extremely complicated structure because the cutting blade that grinds the end surfaces 6a, 6b of the electrode chips 2a, 2b and the cutting blade that grinds the side surfaces 8a, 8b are integrated. However, it has been pointed out that the cutting edge is extremely expensive. In addition, since cutting edges for grinding the end surfaces 6a and 6b are provided on each cutting edge portion, the clearance δ between the electrode tips 2a and 2b during grinding is reduced.
It is difficult to set it sufficiently small. That is, during welding, the electrode tips 2a and 2b are spaced apart by an interval corresponding to the thickness of the workpiece to be pressurized and clamped. Therefore, even during grinding, it is preferable to ensure an electrode spacing equal to the clearance corresponding to the thickness. However, with the above configuration, it is not possible to grind the electrode tips 2a, 2b in the same state as when welding, and it is not possible to grind the electrode tips 2a, 2b with high precision.
There is a possibility that it may become impossible to perform the shaping of 2b.

Further, the cutting edge portion for grinding the electrode tip 2a and the cutting edge portion for grinding the electrode tip 2b have symmetrical shapes because they simultaneously grind the ends of each electrode tip 2a, 2b. In this case, in the chip dresser, the cutting blade part for grinding the electrode tip 2a and the cutting blade part for grinding the electrode chip 2b are independent, so two types of cutting blade parts are always required, and therefore mass production is required. There is an inconvenience that this is inhibited.

[Purpose of the invention] The present invention has been made to overcome the above-mentioned disadvantages, and includes a cutting blade for grinding the end face of the electrode chip, which is integrally provided in the holder, and a cutting blade for grinding the side surface of the electrode chip. An object of the present invention is to provide a dresser for an electrode tip of a resistance welding machine that is inexpensive and capable of grinding the end of the electrode tip with high precision by attaching the electrode tip to the holder to simplify the structure of the grinding part. do.

[Means for Achieving the Object] In order to achieve the above object, the present invention provides an electrode for a resistance welding machine that uses a rotating grinding section to grind the tip and side surfaces of a pair of adjacent electrode tips in the state of the welding machine. In the chip dresser, a first cutting blade for grinding the tip end surfaces of a pair of electrode tips is integrally provided in the holder, and a second cutting blade for grinding the tapered side surface of the tip ends of the pair of electrode tips is provided integrally with the holder. A grinding section is configured by being detachably attached to the holder, and grinding is performed by rotating the grinding section with the tips of the electrode tips in contact with the first and second cutting edges. Features.

Further, the present invention is characterized in that the first cutting edge has a burnishing surface.

[Embodiments] Next, preferred embodiments of the electrode tip dresser for a resistance welding machine according to the present invention will be described in detail with reference to the accompanying drawings.

In FIGS. 2a and 2b, reference numeral 10 indicates the main body of the tip dresser according to this embodiment,
This main body portion 10 is installed within the operating range of a resistance welding machine (not shown) via a connecting member 12.

The main body 10 has a cylinder 14 attached to the connecting member 12, and the cylinder 14 has a mounting plate 16.
The casing 18 is attached via. A rack 22 is formed along the length of the cylinder rod 20 of the cylinder 14 at a portion where it enters the casing 18. On the other hand, a driven member 26 is rotatably supported on the casing 18 via bearings 24a and 24b, and a gear 30 is connected to the outer periphery of the lower part of the driven member 26 via a one-way clutch 28. The formed active member 32 is engaged. In this case, the gear 30 is connected to the cylinder rod 20.
It engages with the rack 22 formed in the. Further, a gear 34 is formed on the upper outer periphery of the driven member 26, and a gear 40 of a driven member 38 that is pivotally supported by the casing 18 via bearings 36a and 36b meshes with this gear 34. A grinding section 42 for grinding the tips of the electrode tips 2a and 2b is engaged with the gear 40. Note that the grinding section 42
Openings 44a and 44b for guiding the tips of the electrode chips 2a and 2b to the grinding section 42 are defined on both upper and lower surfaces of the casing 18 surrounding the casing 18.

Next, the configuration of the grinding section 42 will be explained based on FIGS. 3 and 4. The grinding part 42 is the holder 4
6, and side cutting blade members 50a to 50c attached to the holder 46 via fixing screws 48. The holder 46 has a gear 52 on its outer periphery that meshes with the gear 40 of the driven member 38 . Holder 4
The center portions of both sides of 6 become concave portions 54a and 54b,
Each concave portion 54a, 54b has electrode chips 2a, 2.
guide portions 56a, 56b that are inclined corresponding to the side surfaces 8a, 8b of the electrode tips 2a, 2b;
b is provided. Note that inside the bottom surface of the holder 46,
A circumferential groove 60 is defined between the concave portion 54b and the gear 52, and this circumferential groove 60 is formed in the casing 1.
The grinding portion 42 is supported by engaging with the circumferential protrusion 62 formed in the groove 8 .

The holder 46 further includes concave portions 54a, 54.
The center of the guide portions 56a and 56b of b is set,
Three circular through holes 64a to 64c penetrating from one surface to the other surface are defined, and side cutting blade members 50a to 50c are inserted in parallel to these through holes 64a to 64c. Cutting blade insertion holes 66a to 66c are defined. Note that each of the cutting blade insertion holes 66a to 66c has a screw hole 67a into which a fixing screw 48 is screwed from the outer periphery of the holder 46.
67c to 67c communicate with each other.

End face cutting edges 58a, 58b formed in the center of the concave portions 54a, 54b are used for cutting the electrode chips 2a, 2.
Cutting blades 68a, 68 for grinding the end surfaces 6a, 6b of b
b, and burnishing surfaces 70a, 70b for burnishing the end surfaces 6a, 6b are provided on both sides of each cutting edge 68a, 68b, and end surfaces 6a, 6
Relief grooves 72, 7 for discharging cutting chips from b
2b is formed.

On the other hand, the side cutting blade members 50a to 50c have a substantially triangular shape as shown in FIG. have electrode chips 2a, 2b
Cutting blades 76a, 76 for grinding side surfaces 8a, 8b of
b are formed respectively. In this case, these cutting edges 7
The inclination angles of 6a and 76b are set equal to the inclination angles of side surfaces 8a and 8b.

The electrode tip dresser for a resistance welding machine according to this embodiment is basically constructed as described above, and its operation and effects will be explained next.

First, the assembly work of the grinding section 42 will be explained. Therefore, the side cutting blade member 50a is inserted into the cutting blade insertion holes 66a to 66c defined in the holder 46.
Insert 50c to 50c. In this case, the cutting blades 76a and 76b of the side cutting blade members 50a to 50c are set to project slightly inward from the guide portions 56a and 56b formed in the concave portions 54a and 54b of the holder 46. Ru. In this state, screw hole 67
Fixing screws 48 are screwed into holes a to 67b to fix the side surface cutting blades 50a to 50c to the holder 46. Next, the grinding part 42 is attached to the main body part 10 of the chip dresser by engaging the circumferential groove 60 of the holder 46 with the circumferential protrusion 62 of the casing 18.

Next, the operation of grinding the tips of the electrode tips 2a and 2b will be explained. Therefore, after moving a resistance welding machine (not shown) to the main body 10 of the chip dresser, the electrode chips 2a and 2b are put into a clamped state, so that their tips enter the grinding part 42.
In this case, the tips of the electrode tips 2a, 2b enter the grinding section 42 through the openings 44a, 44b defined in the casing 18, and the end surfaces 6a, 6b abut against the end cutting edges 58a, 58b, Side 8
a, 8b are guided by guide portions 56a, 56b, and are accurately positioned with respect to the side cutting blade members 50a to 50c.

Next, the cylinder 14 is driven to move the cylinder rod 20 forward and backward in the direction of the arrow (second
(see figure b). At this time, the rack 22 formed on the cylinder rod 20 is connected to the main drive member 3 through the gear 30.
Rotate 2 in the direction of the arrow. In this case, the driven member 26 is connected to the one-way clutch 28 in the main driving member 32.
The driven member 26 rotates only in one direction as shown by the arrow as the main driving member 32 rotates. Then, the gears 34 and 4 are attached to the driven member 26.
The driven member 38 that meshes with the driven member 38 through the gears 40 and 52 rotates, and the grinding portion 42 that meshes with the driven member 38 through the gears 40 and 52 rotates. As a result, the end surfaces 6a, 6b and the side surfaces 8a,
Grinding 8b is performed.

That is, the end face cutting blades 58a, 58b grind the end faces 6a, 6b of the electrode chips 2a, 2b by the cutting blades 68a, 68b. In this case, the cutting edge 6
8a and 68b have burnishing surfaces 70a and 70b, and the end surfaces 6a and 6b are rubbed and ground. Therefore, the treated material such as galvanizing attached to the end surfaces 6a and 6b is removed by the cutting edges 68a and 68b.
The escape grooves 72a, 72b are preferably removed by
and is discharged to the outside through the through holes 64a to 64c.

Here, the applicant of the present invention found in Japanese Patent Publication No. 60-50554 that the end faces 6a, 6b of the electrode chips 2a, 2b do not usually require grinding.
The cutting blades 68a, 68b having burnishing surfaces 70a, 70b with no cutting action, the main purpose of which is to remove treatment materials such as zinc plating, are provided integrally with the holder 46. Therefore, the rigidity of the end face cutting blades 58a, 58b is improved, which makes it possible to set the distance between the two faces even smaller.

As a result, the electrode tips 2a, 2 during welding
The present invention can be sufficiently applied to resistance welding machines with a small clearance δ (see Fig. 1) between the electrode tips 2a and 2b, and the tips of the electrode tips 2a and 2b can be ground with high precision in the same condition as when welding. becomes possible. Furthermore, since the side surface cutting blade members 50a to 50c are separate from the end surface cutting blade parts 58a and 58b, the configuration is simple, and the electrode chips can be cut by one type of side surface cutting blade members 50a to 50c. 2a, 2
Since both sides 8a and 8b of b can be ground, mass production is extremely easy and inexpensive side cutting blade members 50a to 50c can be provided. Furthermore, a large number of side cutting blade members 50a to 5
0c (in this case, 3 pieces) using electrode chips 2a,
The side surfaces 8a, 8b of 2b can be ground, and the time required for the grinding process can be shortened.

5 and 6 show other embodiments of the grinding section 42. FIG. In this case, the grinding portion 80 is connected to a gear member 82 that meshes with the gear 40 of the driven member 38.
A holder 86 is fixed to the gear member 82 using fixing screws 84, and fixing screws 90 are inserted into cutting blade insertion holes 88a to 88d defined in the holder 86.
Side cutting blade members 92a to 9 attached by
2d (see Figure 6). in this case,
The holder 86 has four through holes 94a to 94d arranged in parallel to the cutting blade insertion holes 88a to 88d, and an electrode chip 2 between each through hole 94a to 94d.
It has inclined guide portions 96a to 96h that guide the side surfaces 8a and 8b of a and 2b. Further, on both sides of the central portion of the holder 86, an end face cutting edge portion 98a having the same configuration as that of the holder 46 shown in FIG.
98b is integrally provided.

Here, four side cutting blade members 92a to 92d having cutting edges 99a and 99b are attached to the grinding section 80 configured in this way. 92d allows the grinding work of the side surfaces 8a, 8b of the electrode chips 2a, 2b to be performed more efficiently. In addition, since the gear member 82 is constructed separately from the holder 86, the manufacture of the holder 86 becomes easier and cheaper.

[Effects of the invention] As described above, according to the invention, the cutting blade for grinding the end face of the tip of the electrode chip is integrally provided with the holder, and the cutting blade for grinding the side surface of the tip is detachable from the holder. It is configured to be installed on.
In this case, since the cutting blade for grinding the end face of the electrode chip is integrated with the holder, the rigidity of the cutting blade is improved. Therefore, it is possible to perform the grinding operation of an electrode chip with a small clearance between end faces with high precision. Further, since the cutting blade for grinding the tip end surface of the electrode tip is provided separately, only the cutting blade can be replaced, which has the advantage of extending the life of the holder itself. Further, since the cutting blade for grinding the tapered side surface is separate from the cutting blade for grinding the tip end surface, the structure is simple and mass production thereof is extremely easy. Furthermore, since the cutting edge formed integrally with the holder is a grinding blade with a burnishing surface, the tip surface of the electrode chip is not cut unnecessarily, and the tip surface can be smoothed appropriately. On the other hand, the cutting edge itself can maintain high rigidity due to the burnishing surface, thereby further extending the life of the holder itself.

Although the present invention has been described above with reference to preferred embodiments, the present invention is not limited to these embodiments, and various improvements and design changes can be made without departing from the gist of the present invention. Of course.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram of the state of welding a workpiece with an electrode tip of a resistance welding machine, and Figs. 2 a and b are a side partial sectional view and a plan view showing the main body of a dresser for an electrode tip of a resistance welding machine according to the present invention. Partial cross section,
Figures 3a and b are a plan view and a cross-sectional view of the main parts of the grinding section shown in Figure 2, Figure 4 is a perspective view of the cutting blade shown in Figure 3, and Figures 5a and b are the present invention. FIG. 6 is a plan view of a grinding portion and a cross-sectional view taken along the line 1-2 of the essential parts applied to another embodiment of the dresser for electrode tips of a resistance welding machine, and FIG. 6 is a perspective view of the cutting blade shown in FIG. 5. 10... Main body, 14... Cylinder, 18...
Casing, 20... Cylinder rod, 26...
Driven member, 32... Main drive member, 38... Driven member, 42... Grinding part, 46... Holder, 50a~
50c... Side cutting blade member, 58a to 58c...
Cutting edge for end face.

Claims (1)

[Claims for Utility Model Registration] (1) In a dresser for electrode tips of a resistance welding machine that uses a rotating grinder to grind the tip and side surfaces of a pair of electrode tips that are close to each other during welding, The first step is to grind the tip surface.
A cutting blade is integrally provided in the holder, and a second cutting blade for grinding the tapered side surfaces of the tips of the pair of electrode chips is removably attached to the holder to constitute a grinding part, 1. A dresser for an electrode tip of a resistance welding machine, characterized in that grinding is performed by rotating the grinding section with the tip of the electrode tip in contact with the first and second cutting blades. (2) A dresser for an electrode tip for a resistance welding machine according to claim 1, wherein the first cutting edge has a burnishing surface.