JP6922875B2 - Electrode ring dresser and grinding method - Google Patents

Description

The present invention relates to a dresser and a grinding method for an electrode ring.

The surface shape of the electrode ring used for seam welding deteriorates due to heat and pressure each time welding is performed. Deterioration of the surface shape of the electrode ring causes a decrease in welding strength, so that grinding (dressing) at a specific cycle using a dresser is required. As a blade for such a dressing, a technique as described in Patent Document 1 has been proposed.

Japanese Unexamined Patent Publication No. 2015-150614

By the way, in general, grinding of a seam welder is performed for each welding, so improvement of the grinding capacity of the dresser greatly contributes to improvement of production capacity. Further, in some welding machines, grinding may be performed after welding a plurality of times instead of performing each welding. In this case, since the surface condition is deteriorating as compared with the method of grinding each time, the amount of grinding for keeping the surface condition sound increases and more grinding time is required.

Further, in the technique of Patent Document 1, since the cutting edge of the dresser used for grinding the electrode ring has a flat shape, the contact area between the electrode ring and the cutting edge of the dresser at the time of grinding becomes wide, and the dresser is pressed. The pressure drops. For this reason, there has been a problem that the amount of grinding per hour becomes low, it takes time to grind the surface of the electrode ring, and the production capacity decreases.

Therefore, the present invention has been made focusing on the above-mentioned problems, and an object of the present invention is to provide a dresser and a grinding method for an electrode ring, which can improve the grinding ability of the dresser.

According to one aspect of the present invention, it is a dresser of an electrode ring that grinds an outer peripheral surface of an electrode ring for seam welding, and has a plurality of chevron-shaped blades provided over a circular outer peripheral surface, and the plurality of blades. Provided is an electrode ring dresser having a cutting edge angle of 50 degrees or more and 70 degrees or less and a tip radius of 2 mm or less.
According to one aspect of the present invention, there is provided a method for grinding an electrode ring, which grinds the outer peripheral surface of the electrode ring for seam welding by using the above dresser.

According to one aspect of the present invention, there is provided a dresser and a grinding method for an electrode ring, which can improve the grinding ability of the dresser.

It is a figure which shows the dresser which concerns on one Embodiment of this invention, (A) shows the front view, (B) shows the side view. It is a partially enlarged view which shows a dresser. It is a schematic diagram which shows the grinding method of an electrode ring. It is a partially enlarged view which shows the conventional dresser. It is a graph which shows the measurement result of the grinding ability of a conventional dresser. It is a graph which shows the measurement result of the grinding ability of the dresser of an Example. It is a graph which shows the relationship between the use time of the dresser of an Example, and the grinding ability.

The following detailed description illustrates many specific details by exemplifying embodiments of the invention to provide a complete understanding of the invention. However, it is clear that one or more embodiments can be implemented without such particular detail description. Also, for the sake of brevity, the drawings are schematic representations of well-known structures and devices.
<Electrode ring dresser>
The dresser 1 of the electrode ring according to the embodiment of the present invention will be described with reference to FIGS. 1 and 2. The dresser 1 is equipment provided in a seam welder for seam welding, and is equipment for grinding (dressing) the outer peripheral surface of the electrode ring of the seam welder. The seam welder welds two overlapping materials to be welded by a pair of electrode rings arranged so as to face each other in the vertical direction. At this time, the materials to be welded are connected to each other by passing an electric current while pressing down the two steel plates to be welded with a pair of electrode rings.

As shown in FIG. 1, the dresser 1 has a disk-shaped shape, can cut an electrode ring made of copper or a copper alloy, and has excellent wear resistance and a high hardness metal (for example, for a cold mold). (Steel, etc.). Further, the dresser 1 is configured to be rotatable by receiving a rotational drive of the rotary drive device by connecting a circular central portion to a rotary drive device (not shown). Further, the dresser 1 has a plurality of blades 2 over a circular outer peripheral surface which is a disk-shaped side surface.

As shown in FIGS. 1A and 2, the plurality of blades 2 are in the thickness direction of the disk shape of the dresser 1 (the direction indicated by the arrow in FIG. 1B, and are also simply referred to as “thickness directions” below. When viewed from.), It has a chevron shape with a sharp tip. Further, the plurality of blades 2 have an angle θ of the cutting edge of 50 degrees or more and 70 degrees or less and a tip radius of 2 mm or less when viewed from the thickness direction. When the angle θ of the cutting edge is less than 50 degrees, the strength of the plurality of blades 2 is lowered, so that the cutting edge is likely to be chipped. On the other hand, when the angle θ of the cutting edge exceeds 70 degrees, the cutting edge wears with use, so that the pressing pressure tends to decrease, and the effect of improving the grinding ability cannot be sufficiently obtained. Further, when the tip radius exceeds 2 mm, the cutting edge becomes almost flat and the pressing pressure decreases, so that the effect of improving the grinding ability cannot be sufficiently obtained. Further, it is preferable that the height H of the plurality of blades 2 in the diameter direction of the dresser 1 is 2.0 mm or more and 2.5 mm or less. As shown in FIG. 2, the height H is the distance in the diameter direction of the dresser 1 from the tip of the blade 2 to the valley where the blades 2 are connected to each other. By setting the height H in the above range, the strength of the cutting edge can be maintained while the polishing ability is improved by sharpening the angle. The plurality of 2s have the same shape in the thickness direction.

(Grinding method of electrode ring)
Next, a method of grinding the electrode ring 3 according to the present embodiment will be described with reference to FIG. In the present embodiment, as shown in FIG. 3, the outer peripheral surface of the dresser 1 is brought into contact with the outer peripheral surface of the electrode ring 3 of the seam welder. Then, by rotating the electrode ring 3 and the dresser 1, the outer peripheral surface of the electrode ring 3 is ground. Grinding of the electrode ring 3 is performed every time welding is performed once or a plurality of times by a seam welder. Further, the seam welder is provided with a pair of electrode rings 3 facing each other in the vertical direction, and each electrode ring 3 is provided with a dresser 1 for grinding. Grinding by the dresser 1 is performed until the grinding amount of the electrode ring 3 becomes a predetermined amount (for example, 2 mm) or more.

_{Further, in the present embodiment, the grinding capacity dave} (mm / hr) represented by the equation (1) is 2.0 mm / hr or more with respect to the usage time (time used for grinding) of the dresser 1. It is preferable to use the dresser 1. Grinding capacity _dave is the amount of grinding per hour. That is, as shown in the equation (2), the grinding time T (hr) is calculated from the relationship between _{the grinding capacity dave and the target grinding amount D (mm).} The grinding time T is the time required for grinding to be the grinding amount D.
d _ave = −0.15 × t + 4 ・ ・ ・ (1)
T = D / _dave ... (2)

Since the tip of the dresser 1 is worn by grinding, the grinding capacity _dave decreases according to the usage time, and the grinding time T becomes long. Therefore, high grinding ability is maintained by adjusting the timing of replacing the dresser 1 so _{that the allowable grinding ability dave} and the grinding time T are obtained by using the equations (1) and (2). be able to.

<Modification example>
Although the present invention has been described above with reference to specific embodiments, it is not intended to limit the invention by these descriptions. By reference to the description of the invention, one of ordinary skill in the art will appreciate the disclosed embodiments as well as other embodiments of the invention that include various modifications. Therefore, it should be understood that the embodiments of the invention described in the claims also include embodiments including these modifications described in the present specification alone or in combination.

For example, in the above embodiment _{, the dresser 1 is used under the condition that the grinding ability ave} calculated by the equation (1) is 2.0 mm / hr or more, but the present invention is not limited to such an example. _{The grinding ability dave} calculated by the equation (1) is the most suitable relational expression under the initial condition that the angle θ of the cutting edge of the blade 2 is 60 degrees and the tip radius is 1.0 mm. A relational expression other than the equation (1) may be used due to the difference in radius. Further, the tip radius of the blade 2 of the dresser 1 in the initial unused state may be set to less than 2 mm, and the dresser 1 may be replaced at the timing when the tip radius exceeds 2 mm.
Further, R-shapes may be provided on both ends of the dresser 1 in the thickness direction so that the diameters of both ends of the disc-shaped dresser 1 in the thickness direction become large. By doing so, it is possible to adjust the width of the electrode ring 3 and the like at the time of grinding.

<Effect of embodiment>
(1) The dresser 1 of the electrode ring 3 according to one aspect of the present invention is a dresser 1 of the electrode ring 3 that grinds the outer peripheral surface of the electrode ring 3 for seam welding, and has a chevron shape provided over a circular outer peripheral surface. The plurality of blades 2 have a cutting edge angle of 50 degrees or more and 70 degrees or less, and a tip radius of 2 mm or less.

(2) In the method for grinding the electrode ring 3 according to one aspect of the present invention, the outer peripheral surface of the electrode ring 3 for seam welding is ground by using the dresser 1 described in (1) above.

According to the configurations (1) and (2) above, by sharpening the plurality of blades 2 of the dresser 1, it is possible to reduce the contact area of the dresser 1 with the electrode ring 3 in the circumferential direction during grinding. , The pressing pressure can be increased. As a result, the grinding ability can be significantly improved and the grinding time can be significantly shortened as compared with the conventional dresser 1a having a flat tip of the blade 2a as shown in FIG. Further, by setting the angle of the cutting edge within the above range, it is possible to prevent the cutting edge from being chipped during grinding.

(3) In the configuration of (2) above, the dresser 1 is used under the condition that the _{grinding ability ave calculated by the equation (1) is 2.0 mm / hr or more with respect to the usage time of the dresser 1.}
According to the configuration of (3) above, the grinding ability can be maintained by a simple method using the usage time.

Next, the examples carried out by the present inventors will be described. In the embodiment, the grinding ability of the dresser 1 according to the above embodiment shown in FIGS. 1 and 2 and the grinding ability of the conventional dresser 1a having a flat cutting edge shown in FIG. 4 were measured, respectively. The angle of the cutting edge of the dresser 1 was 60 degrees, and the tip radius was 1.0 mm. FIG. 5 shows the measurement result of the grinding ability of the conventional dresser 1a, and FIG. 6 shows the measurement result of the grinding ability of the dresser 1 according to the above embodiment. As can be seen from FIGS. 5 and 6, it was confirmed that the grinding ability was significantly improved by sharpening the cutting edge of the dresser.

In addition, in the examples, the decrease in grinding ability due to the increase in the cumulative usage time of the dresser 1 was also investigated. FIG. 7 shows the relationship between the cumulative usage time of the dresser 1 and the grinding ability according to the above embodiment. As shown in FIG. 7, the cumulative usage time and the grinding ability have a relationship satisfying the equation (1), and by using the equation (1), the grinding ability according to the usage time can be estimated accurately. It could be confirmed. Further, in the case of the conventional dresser 1a, the grinding capacity was about 0.5 mm / hr, although the grinding capacity did not change significantly with respect to the cumulative grinding time. Therefore, it was confirmed that the dresser 1 according to the above embodiment has a high grinding ability at a usage time of about 20 hr.

1,1a dresser 2,2a blade 3 electrode ring

Claims (3)

A dresser for electrode rings that grinds the outer peripheral surface of electrode rings for seam welding.
It has a plurality of chevron-shaped blades provided over a circular outer peripheral surface, and has a plurality of chevron-shaped blades.
Wherein the plurality of blades is the angle of the cutting edge is 70 degrees or less than 50 degrees, the tip radius Ri der less 2 mm, height Ru der than 2.5mm or less 2.0 mm, the electrode wheels of the dresser. A method for grinding an electrode ring, which grinds the outer peripheral surface of the electrode ring for seam welding using the dresser according to claim 1. The method for grinding an electrode ring according to claim 2, wherein the dresser is used under the condition that the _{grinding capacity ave} calculated by the equation (1) is 2.0 mm / hr or more with respect to the usage time of the dresser.
d _ave = −0.15 × t + 4 ・ ・ ・ (1)

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