KR101628074B1

KR101628074B1 - cutting tool for caliper

Info

Publication number: KR101628074B1
Application number: KR1020150191371A
Authority: KR
Inventors: 정성호; 이원준
Original assignee: 에스앤티에이엠티(주)
Priority date: 2015-12-31
Filing date: 2015-12-31
Publication date: 2016-06-08

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cutting tool, and more particularly, to a cutting tool for machining a circular arc pattern having a predetermined gap on a finger surface of a caliper, And a cutting tool for calipers.

Description

Cutting tool for caliper {cutting tool for caliper}

Typical brakes used in vehicles are disc brakes and drum brakes depending on the braking method.

Among them, a disc brake is a brake which disc-shaped disc is attached to a wheel of a vehicle, and a brake pad is closely attached to the disc to slow down the rotation speed of the wheel. A brake pad as shown in FIG. 1 is held on one side of the disc And a brake pad installed on the caliper is moved toward the end surface of the disk by a piston fixed to the caliper.

In this case, the inner surface of the caliper for holding the brake pads is generally referred to as a finger surface, and the finger pad can be installed in a state in which the brake pad is parallel to the plane of the disk, If the machining of the finger surface is poor, the braking force is reduced or the squeal noise (braking noise) is generated during operation of the brake, thereby deteriorating the quality of the vehicle.

In other words, the caliper finger surface as shown in FIG. 2 has a shape in which the shapes of the A-plane and the B-plane are not uniform, that is, different tool marks are formed and it is difficult for the brake pads to be kept horizontal with the cross- There is a lot of noise during operation.

On the other hand, as a conventional cutting tool, there is a milling cutting tool disclosed in Korean Patent No. 10-0698383.

The present invention relates to a cutting tool comprising a cutting insert having a circular opening vertically penetrating through the center thereof, a cutter body to which the cutting insert is coupled, and a screw for fixing the cutting insert to the cutter body, the insert comprising: A lower surface having a shape symmetrical parallel to and parallel to the upper surface, a side connecting the upper surface and the lower surface, a corner side connecting the adjacent side surfaces, Wherein the upper surface and the lower surface corner are formed with cutouts, and the upper surface or the lower surface and the side surface meet to form a main surface, and the upper surface or the lower surface Wherein a corner cut is formed between the sub-cut and the sub-cut to connect the cut-in cut and the cut-in cut, Wherein the circular opening is provided and an inclined upper surface and an inclined lower surface are formed adjacent to the circular opening in the upper surface and the lower surface Wherein the upper surface and the lower surface are formed to be in contact with the secondary side surface and the lower surface and the lower surface are sequentially formed between the lower surface and the upper surface and the lower surface, Wherein the upper and lower surfaces are formed to meet the side surfaces and the upper and lower surfaces are formed to meet with the edge side surfaces, and the edge cut- The present invention relates to a milling cutting tool employing a double-sided cutting insert, which is formed to be higher than a lower surface and a flat lower surface of the cutter body, wherein a tool mark having a certain shape is formed on a corner of a workpiece having a radius larger than that of the cutter body, There is a problem that is difficult to leave.

In particular, in the case of a caliper finger surface, a tool mark having a circular arc shape close to a straight line must be formed. Therefore, a cutting tool having a relatively large radius is required, and such a large radius cutting tool can be used in a milling machine, , Machining centers, and the like, which makes the manufacturing process complicated, thereby increasing processing time and processing cost.

Accordingly, it is an object of the present invention to provide a cutting tool for caliper processing for machining a circular pattern having a predetermined interval on a finger surface of a caliper.

Another object of the present invention is to provide a cutting tool for caliper machining which can be used in a general purpose machine tool such as a machining center by forming the cutting tool in the shape of an arc divided by a predetermined angle in the shape of a circle.

Another object of the present invention is to provide a cutting tool for caliper machining in which a weight is attached to the opposite side of the outer circumferential surface in order to reduce the effect of eccentric force upon rotation since the shape of the cutting tool body is the shape of an arc.

A cutting tool for caliper processing according to the present invention is a cutting tool for machining a finger surface of a caliper, wherein the cutting tool comprises a shank mounted on a spindle of a machine tool, and a body coupled to the shank, , The body is characterized in that an outer circumferential surface is formed so as to have a constant radius and an arc shape divided by a certain angle in the shape of the circle.

The cutting tool for caliper machining according to the present invention can be machined so that a circular arc having a predetermined interval is displayed on the finger surface of the caliper. The cutting tool is formed into an arc shape divided by a certain angle in a circle shape, Since the shape of the cutting tool body is the shape of an arc, it is possible to reduce the eccentric force by combining the weight on the opposite side of the outer circumferential surface in order to reduce the effect of eccentricity during rotation, thereby preventing the spindle from shaking It is effective.

Fig. 1 is a perspective view of a general caliper.
Figure 2 is a side view of a caliper finger face image
Figs. 3 and 4 are views showing a configuration of a cutting tool for caliper machining according to the present invention
Figs. 5 and 6 show an example of a cutting tool for caliper machining according to the present invention
Fig. 7 is a side view of the caliper finger face image processed using the cutting tool according to the present invention

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIGS. 3 and 4 are views showing the construction of a cutting tool for caliper processing according to the present invention, FIGS. 5 and 6 are views for explaining a cutting tool for caliper processing according to the present invention, A cutting tool for machining a finger surface (2) of a cutting tool (1), the cutting tool comprising: a shank (10) mounted on a spindle of a machine tool; And the body 11 is formed with an outer circumferential surface 13 having a predetermined radius and is shaped like an arc divided by a predetermined angle in the shape of a circle.

First, the shank 10 refers to a bag mounted on a tool holder of a machine tool, and the tool holder is mounted on a tool base of a machine tool, which is a spindle (main shaft) through which rotational power of the machine tool is transmitted.

That is, the body 11 is formed with the outer circumferential surface 13 so as to have a certain radius as shown in the figure, and if the entire outer circumferential surface 13, If the angle between the cutting tips 14 is 10, the number of the cutting tips 14 that can be fastened to the body 11, which is entirely circular, is 36 However, since the present invention is in the form of a divided arc, far fewer than 36 cutting tips can be fastened.

Since the shape of the body 11 is an arc shape, when the body 11 is rotated at a relatively high speed, an eccentric force is applied to the spindle, There is a fear of trembling. To solve this, the weight 12 is coupled to the opposite side of the body outer circumferential surface 13.

That is, the weight (12) is weighted to one side due to the cantilever-shaped body (11), so that the bearing supporting the spindle or the spindle is prevented from being unreasonable, thereby preventing the spindle from shaking, So that it can be processed smoothly.

The weight of the weight 12 may vary depending on the hardness of the material to be processed and the rotation speed of the spindle.

That is, when the spindle is rotated at a higher speed due to the high hardness of the material, relatively high eccentricity may be exerted by the arc-shaped body. In this case, the relatively heavy weight 12 is used, A weight 12 having a small weight can be used.

In other words, as the length of the outer circumferential surface 13 is longer at the rotation center axis of the shank 10, it is natural that the moment of inertia becomes larger at the same rotation speed, and the higher the speed, the larger the moment of inertia. The weight of the weight must be determined.

The number of the cutting tips 14 to be fastened to the body 11 is most preferably between 2 and 8. In the cutting tools shown in FIGS. 3 and 4, three cutting tips 14 are fastened, In the cutting tool shown in Figs. 5 and 6, five cutting tips 14 are fastened.

When the number of the cutting tips 14 is less than two, that is, when only one of the cutting tips 14 is fastened, the cutting amount is small and the surface roughness of the processed workpiece is lowered and the machining speed is slow. It is necessary to rotate the cutting tool at a relatively high speed so that the spindle can be overloaded and tool marks on the fingertip surface 2 may be formed.

It is preferable that a hypothetical line toward the center axis of the cutting tip 14 is directed in a tangential direction in contact with the body outer circumferential surface 13. This means that the cutting tip for performing the preceding machining and the cutting tip for performing the following machining So that it is possible to generate a pattern of arcs having a certain interval on the finger surface.

In addition, in the illustrated embodiment, the cutting tip is a cutting tip having a circular circumferential surface, and after a predetermined amount is machined, the cutting tip can be used repeatedly by rotating at a predetermined angle. In some cases, a triangular cutting tip or a square cutting tip have.

FIG. 7 is a photograph of a caliper finger surface processed using a cutting tool according to the present invention, in which a pattern of a circular arc near a straight line appears on the finger surface of the caliper, and the pattern of such circular arc is formed by suitably adjusting the rotation speed and the transfer speed of the main shaft You can.

As a result, the cutting tool for caliper machining according to the present invention can be machined such that a circular arc pattern having a predetermined gap is displayed on the finger surface of the caliper, Since the shape of the cutting tool body is the shape of the arc, it is possible to reduce the eccentric force by combining the weight on the opposite side of the outer circumferential surface in order to reduce the eccentric force during rotation. There is an effect to prevent.

1. Caliper 2. Finger Face
10. Shank 11. Body
12. Weight 13. External circumference
14. Cutting tip

Claims

A cutting tool for machining a finger surface (2) of a caliper (1)
The cutting tool comprises a shank 10 mounted on a spindle of a machine tool and a body 11 coupled to the shank 10 and fastened with a cutting tip 14. The body 11 has a constant radius The outer circumferential surface 13 is formed so as to have a shape of an arc divided by a predetermined angle in the shape of a circle,
Wherein the number of cutting tips (14) fastened to the body (11) is between two and eight.

The method according to claim 1,
The body 11 is rotated with respect to the rotation center axis of the shank 10 and a weight 12 is provided on the opposite side of the outer circumferential surface 13 having a constant radius in order to reduce the effect of eccentric force due to the shape of the arc Wherein the spindle is combined to prevent the spindle from shaking.

delete

The method according to claim 1,
Wherein a virtual line of the cutting tip (14) facing the central axis is directed in a tangential direction in contact with the body outer circumferential surface (13).

3. The method of claim 2,
Characterized in that the weight of the weight (12) varies depending on the hardness of the material to be machined and the rotational speed of the spindle.