JPH09141452A - Welded chip dresser - Google Patents

Abstract

PROBLEM TO BE SOLVED: To smoothly extrude chip powder at the central part and improve discharging performance by forming a chip powder discharge groove in the axial direction of a cutter holder along a cutting blade and also forming an auxiliary discharge groove in the axial direction of the cutter holder almost at right angles to the cut powder discharge groove. SOLUTION: Welding electrodes are inserted into tapered holes 21 and 21 of the rotating cutter holder and their flanks and tips are cut with the side cutting blade part 31 and tip cutting blade part 32 of the cutting blade 30. Then chip powder is discharged from the cutter holder through the chip powder discharge groove 33 formed opposite the cutting blade 30. At this time, chip powder which is cut by the tip cutting blade part 32 and enters the center part in the chip powder discharge groove 33 receives the pressure of chip powder moving axially in the chip powder discharge groove 33. The chip powder having entered the center part is thus pressed and sent in the auxiliary discharge groove 34 in order, and then discharged to outside the cutter holder through the groove.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dresser for shaping a welding tip, and more particularly to a cutter holder for the dresser.

[0002]

2. Description of the Related Art A welding tip used in a welding robot or the like is deformed or worn due to its use, the surface attachment state with a work is deteriorated, and the welding efficiency is lowered.

In the tip dresser used for this shaping,
Generally, as shown in FIGS. 5 and 6, the cutter holder a
A chip discharge hole c penetrating in the axial direction is provided in the upper and lower taper holes b along the cutting blade d, and chips generated by cutting are discharged to the outside from the chip discharge hole c. ing.

However, in such a tip dresser, chips are clogged in a narrow central part by repeated use, and this clogged part serves as a stopper to prevent the cutting blade d from biting into the welding electrode. This causes inconveniences such as reduced efficiency and deterioration of the cutting edge due to frictional heat.

In order to eliminate such an inconvenience, it is possible to make the chip discharge hole c as large as possible. However, if the chip discharge hole c is made larger, the tip side surface and the tip part of the welding electrode will become the chip discharge hole c. It engenders another problem that leads to overload.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of such a problem.
It is to provide a new welding tip dresser capable of removing the clogging of chips as much as possible.

[0007]

That is, according to the present invention, as a welding tip dresser for achieving such a problem, a chip discharge groove is provided along a cutting blade provided on a cutter holder. In addition to being provided in the axial direction of the cutter holder, an auxiliary discharge groove in a direction substantially orthogonal to the chip discharge groove is provided in the axial direction of the cutter holder in the vicinity of the axial center of the cutter holder.

[0008]

Embodiments of the present invention will be described below. 1 to 4 show a welding tip dresser according to an embodiment of the present invention. First, the welding tip dresser will be described with reference to FIG.
The welding tip dresser indicated by is rotated by engaging the drive gear 12 disposed in the housing 11 with the tooth portion 25 provided on the outer periphery of the cutter holder 20, and the welding tip dresser is opened.
It is configured such that the tip of the welding electrode 40 inserted into is cut and shaped.

Next, the cutter holder will be described with reference to FIGS. 1 to 3. In the cutter holder 20, tapered holes 21 and 21 for inserting the welding electrodes 40 and 40 are connected to the upper and lower surfaces of the cutter holder 20 at the central portion. Further, as shown in FIG. 3, a cutting blade 30 having a substantially triangular shape corresponding to the cross-sectional shape of the cutter holder 20 is formed in the tapered holes 21 and 21 on the side facing the rotation direction. And is installed in a direction parallel to the axis, and is fixed by a bolt 23 screwed into a screw hole 22 of the cutter holder 20.

As shown in FIG. 3, the cutting blade 30 has a side surface cutting edge portion 3 for cutting the tip side surface of the welding electrode 40.
1, 31 and tip cutting edge portions 32, 32 for cutting the tip portion are formed, and the tip of the tip cutting edge portion 32 is configured to reach a position slightly beyond the axial center of the cutter holder 20. There is.

On the other hand, reference numeral 33 in the drawing denotes a chip discharge groove for discharging chips generated during cutting. The chip discharge groove 33 is formed on the side surface cutting edge portion 31 and the tip cutting edge portion 32 of the cutting blade 30. The inclined surfaces 35 are provided so as to face each other and extend outward at a slight angle θ from the upper surface to the axial direction of the cutter holder 20, preferably at an angle of 3 ° to 7 °. The inward direction is extended to a position where the end face of the tip cutting edge portion 32 of the cutting blade 30 is exposed, and in the vicinity thereof, an auxiliary carry-out groove 34 extending in a direction orthogonal to the chip discharge groove 33 is also formed. The cutter holder 20 is bored in the axial direction.

In the embodiment thus constructed, the welding electrodes 40 and 40 are inserted into the tapered holes 21 and 21 of the rotating cutter holder 20, and the side surfaces and the tips thereof are the side surface cutting edge portions 31 of the cutting blade 30. When the cutting is performed by the tip cutting edge portion 32, the scraped off chips are discharged to the outside of the cutter holder 20 through a chip discharging groove 33 provided facing the cutting blade 30.

At this time, the cutting chips cut by the tip cutting edge portion 32 and entering the central portion of the chip discharging groove 33 move in the chip discharging groove 33 in the axial direction. Although it receives the pressure of the powder, as described above, since the auxiliary discharge groove 34 is recessed in a direction substantially orthogonal to the chip discharge groove 33, the chips that have entered the central portion have this pressing action. Upon receipt, it is sequentially sent to the auxiliary discharge groove 34 and discharged from there to the outside of the cutter holder 20.

[0014]

As described above, according to the present invention, a chip discharge groove is formed in the cutter holder provided in the cutter holder along the cutting blade in the axial direction of the cutter holder, and the cutter holder is provided. Auxiliary discharge groove is formed in the axial direction of the cutter holder in the axial direction of the cutter holder in the vicinity of the center of the chip, so that chips generated during cutting are discharged from the chip discharge groove to the outside. , The pressure of the chips collected in the central part along the tapered hole pushes the chips in the central part into the auxiliary discharge groove, and it is possible to reliably discharge the chips to the outside without causing the clogging of the chips in this part. it can.

Moreover, since the chip discharge groove has an inclined surface that expands downward from above with respect to the axis of the cutter holder, the chips in the central portion can be extruded smoothly,
The discharge performance can be improved.

[Brief description of the drawings]

FIG. 1 is a plan view of an apparatus showing an embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA of the same apparatus.

FIG. 3 is a sectional view taken along line BB of the above apparatus.

FIG. 4 is an overall sectional view of the same device.

FIG. 5 is a plan view of a conventional welding tip dresser.

FIG. 6 is a sectional view taken along line CC of the above apparatus.

[Explanation of symbols]

 20 Cutter Holder 30 Cutting Blade 33 Chip Discharge Groove 34 Auxiliary Discharge Groove 35 Inclined Surface 40 Welding Electrode

Claims (2)

[Claims] 1. A cutting blade provided on a cutter holder,
A chip discharge groove is provided along the cutting blade in the axial direction of the cutter holder, and an auxiliary discharge groove in a direction substantially orthogonal to the chip discharge groove is provided near the axial center of the cutter holder. Welding tip dresser characterized by being recessed in the axial direction. 2. The welding tip dresser according to claim 1, wherein the chip discharge groove is widened downward from above with respect to the axis of the cutter holder.