JPS59113992A - Grooving method of brake disc - Google Patents

Abstract

PURPOSE:To permit free selection of disc material and to improve working efficiency in grooving of a brake disc by scanning laterally vibrating laser disc in the radial direction of the disc and blowing a high pressure gas to the irradiated part. CONSTITUTION:Laser light 5 is reflected downward by a reflecting mirror 6 and irradiates the pad sliding surface 2 of a disc 1. The disc 1 is turned by a turntable 9 and a groove 3 is engraved. The mirror 6 is vibrated by a vibrator 7 to vibrate laterally the light 5 thereby providing a width to the groove 3. The outflow melt is removed by blowing a high-pressure gas from an injection nozzle 10 to the irradiated part. This method is not limited by the hardness, etc. of the disc material, uses no cutting tool or the like and performs grooving at a high speed and therefore the working efficiency is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention mainly relates to a method of forming radial grooves on a pad sliding surface for water drainage and other purposes when manufacturing a brake disc for a two-wheeled motor vehicle.

Conventionally, this groove has been generally formed by cutting or press processing, and in these methods, especially when the machined surface is made of stainless steel or other hard materials, workability is poor and productivity is reduced. Additionally, there are disadvantages such as short tool life.

The object of the present invention is to provide a method free from the inconveniences according to the present invention, in which a laser beam guided from a laser light source is irradiated on the pad sliding surface of the brake disc while vibrating in the lateral direction. is scanned in the radial direction of the disk, and high-pressure gas is applied from behind in conjunction with the scanning.

An example of implementing the present invention will be explained with reference to the attached drawings.

In the drawing, (1) shows the pad sliding surface formed on each side of the brake disc, and the sliding surface (2) has grooves (3) for draining and other purposes, for example, as shown in FIG. 1. In order to do this, for example, as shown in FIG. 1, a laser light source (4) consisting of a laser oscillator is prepared above the disk (1), and
The laser beam (5) guided by the laser beam (5) is reflected downward by the reflecting mirror (6) and is irradiated to the sliding surface (2) via the lens (6a), but in this case, the reflecting mirror (6) ) is vibrated by a vibrator (7) sitting in a vibrator amplifier (7a) on the back side of the laser beam (51Fi) so that it can be given lateral vibration, and this is further applied to the disk (1).
It was made to scan in the radial direction. For this scanning, it is sufficient to move at least one of the laser beam (5) and the disk (1) in the radial direction. In addition, at this time, the disc (1) is held on the outer periphery of a turntable (9) above it that is linked to a prime mover (not shown) in a lower machine base (8). This gives a slow rotation in the direction of the arrow in the drawing, so that the scanning is more or less inclined with respect to the radial direction. Further, during the scanning, high-pressure air or other high-pressure gas is introduced from behind through the injection nozzle 00) to follow the scanning, and the melted portion generated during the scanning is removed by the action of the gas. According to this, the above-mentioned groove (3) can be obtained in a predetermined cross-sectional shape on the scanning line.

The gas is, for example, 4Y! In this case, if air is used as the gas, a straight groove (3
) gives relatively sharp corners, but when oxygen is used as the gas, sharp oxidative combustion causes the corners to sag. In addition, the cross-sectional shape of the straight groove (3) is changed more or less depending on the amplitude of the vibration of the laser beam (5), etc., as shown in FIGS. 3 to 5, for example. Although the vibration waveform is shown, the cross-sectional shape shown in FIG. 3 is generally advantageous in terms of function and productivity.

The above-mentioned scanning is generally performed from the outer periphery to the inner periphery, and in order to avoid sag at the cut end of the groove (3) that occurs in this case, the end portion is provided with a seal as shown in FIG. 1, for example. It is preferable to include a shielding member αυ such as a copper plate.

In this way, according to the present invention, a laser beam is vibrated horizontally and scanned once, and then high-pressure gas is applied from behind, thereby easily and efficiently forming a groove with a predetermined cross-sectional shape. This method has the advantage of not having the above-mentioned disadvantages of conventional methods.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram of an example of the method of the present invention, Fig. 2 is a plan view of an example of a product obtained, and Figs. 3 to 6 are relationships between the vibration waveform of the laser beam and the cross-sectional shape of the groove. FIG. (11...Brake disc (2)...Pad sliding surface (3)...Groove (4)...Laser light source (5)... ... Laser light (7) ... Vibrator (101 ... 2 people outside the injection nozzle)

Claims (1)

[Claims] A laser beam guided from a laser light source is vibrated and irradiated on the brake disk band mrm to scan it in the radial direction of the disk, and along with the scanning, high pressure is applied from behind. A method for machining grooves on brake discs by applying gas.