KR910007020Y1 - Chip breaking device for annular cutters - Google Patents

Abstract

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Description

Chip Breaker Device for Circular Blade

1 is a side view of a perforator provided with a chip breaker device according to the present invention.

2 is a front view of an embodiment of a chip breaker device according to the present invention installed in a perforator.

3 is a plan view showing another embodiment of the chip breaker device of FIG. 2 together with an annular blade.

Figure 4 is a plan view showing another embodiment of the chip breaker device of the present invention with an annular blade.

5 is a perspective view of an adjustment wedge applied to the chip breaker device of FIG.

The present invention relates to a chip breaker device for an annular blade with improved chip ejection performance and cutting performance.

In the drilling operation, two twist drills having cutting blades can be used, but since a small electric motor can be installed and cutting time can be shortened, a circular blade is usually used.

This annular blade has a hollow cylindrical body which is rotationally driven by arranging a plurality of cutting blades in a ring at the lower edge thereof.

This annular blade is used to cut a narrow annular groove by a cutting blade, thereby efficiently forming a desired hole.

The chips cut by the cutting blades of the annular blade are discharged out of the chip discharge grooves through chip discharge grooves formed in the main body adjacent to these cutting blades in the annular grooves which are being formed in reality.

Since the discharged chips are pushed out continuously from the discharge groove, they are easily wound on the outer circumferential surface of the annular blade, and the deeper the cutting edge of the annular blade is, the greater the amount of chips are wound around the annular blade. It causes a decrease in capacity and an increase in cutting resistance.

So in the end, you have to stop drilling.

In this case, the stationary annular blade must be removed from the workpiece and the chip must be removed by hand.

This effort inevitably leads to a reduction in cutting capacity.

To overcome this time, a chip breaker device for an annular blade has been proposed, which has lugs extending parallel to the outer circumference of the annular blade, as described in US Pat. No. 4,514,120.

This lug is excreted near the outer edge of the annular blade and the chip coming out of the chip ejection groove

It hits the lower end of the lug and is bent forcibly and then scattered in the centrifugal direction.

However, chips cut into the annular grooves formed in the workpiece may be curled outside the chip outlet, or the thickness of the chips that are irregularly twisted or cut due to the change of cutting conditions may be slightly changed.

As a result, even if the chip hits the lug of the conventional chip breaker device, the chip is not cut, and is often wound up while being wound on the annular blade.

Once wound on the blade, the amount of chips around it is cumulatively significant, resulting in a significant reduction in chip evacuation efficiency.

If the chip is strongly wound on the annular blade, the drilling operation must be stopped or the chip must be removed before the next drilling operation.

These things are not only a waste of effort, but they also hurt the driver's fingers with sharp chips.

It is an object of the present invention to provide a chip breaking device for an annular blade that improves chip discharging efficiency while preventing the chip from being strongly wound on the annular blade.

In order to achieve this object, the chip breaker device for the annular blade of the present invention is a stem extending parallel to the outer circumference of the main body of the hollow cone cylinder of the annular blade and extends to the vicinity of the outer circumference of the main body at right angles to the stem and in the axial direction of the main body. It consists of at least three long and thin chip breaking elements spaced apart.

As the drilling operation progresses, the chips are spread by centrifugal force, and some of them are first wound around the chip breaking element.

Since the blade is rotating at high speed, the chip is thinly cut.

Therefore, there is no occurrence of continuous chips, which are strongly wound on the outer circumference of the annular blade or block the chip discharge groove.

In the following, the present invention is described according to an embodiment with reference to the drawings.

As shown in FIG. 1, the perforator has a frame 4, and an electromagnetic adsorption base 2 is provided at the bottom of the frame.

The base 2 is electronically fixed to a desired position on the electromagnetic workpiece 1st place.

The electric drill 3 is installed in the upper part of the front part of the frame 4 so that lifting is possible.

The cutter arbor 6 is supported on the same axis in the spindle 5 of the electric drill 3.

The center of the cutter arbor 6 is held by the holder 7 protruding from the front part of the base 2, and the annular blade 8 is held and fixed in the lower end of the cutter arbor 6.

The high-rotation pin 9 is installed in the cutter arbor b in a high axis, and it is elastically pressed downward and can be mounted on the lower end of the annular blade 8.

The pilot pin 9 acts as a center for the annular blade 8 and the pin for slug removal.

The electric drill 3 is lifted manually by the handle 10 installed in the frame 4, or automatically lifted by an automatic dispensing unit serving as a deceleration mechanism such as, for example, an electric motor and a harmonic drive mechanism.

The upright stabilizer or stopper 12 is screwed to the rear of frame 4, and the front drill of base 2 is prevented from rising by the reaction force generated when the drill 3 descends and the circular blade 8 cuts the workpiece 1. Doing.

In addition, a so-called spike pin 13 may be provided in the vicinity of the stopper 12 to be embedded in the workpiece 1 so as to prevent the base 2 from sliding sideways.

As shown in FIG. 2 and FIG. 3, the annular blade 8 has the several cutting blade 15 in the lower edge 14a of the main body 14 of a hollow cone cylinder.

The main body 14 has a plurality of chip discharge grooves 16 on its outer circumference 14A which are in contact with the corresponding cutting blade 15 and extend from the lower edge 14a of the main body 14 to the upper edge thereof at a predetermined twist angle.

When chip 18 is cut out from the workpiece 1, each chip is pushed up along the upper chip discharge groove 16 immediately after cutting the cutting blade.

The cutting blade 15 is used as the outer blade and the inner blade alternately arranged in the circumferential direction of the lower edge 14a of the main body 14.

In other words, one inner blade and a pair of outer blades form a group, and a plurality of such groups are arranged at equal intervals along the lower edge 14a of the main body 14.

As the annular blade 8 rotates, the inner blade cuts the inside of the annular groove 17 in the workpiece 1, and the outer blade cuts the outer side of the annular groove 17, and as a result, the annular groove 17 is gradually deepened in the workpiece 1. .

The chip breaker device 20 according to the present invention is fixed to the front part of the punching machine so as to face the outer circumference 14A of the hollow cylindrical cylindrical body 14 of the annular blade 8, and has a comb-like member 21.

The comb-shaped member 21 is made up of a long thin vertical stem 21A extending in the axial direction of the main body 14 of the annular member 8 and at least three chip breaking elements 21B extending at right angles to the outer circumference 14A of the annular blade 8.

The tip 21C of the chip breaking element 21B is on the same vertical plane and is located near the outer circumference 14A of the main body 14.

There are five chip breaking elements 21B each, for example, 15 mm long and 3 mm thick. When the stem 21A is 55 mm high, the gap 23 of 5 mm is maintained between each other.

At this time, the distance between the tip 21C of the chip breaking element 21B and the outer circumference 14A of the main body 14 is, for example, 3 mm.

The chip breaking element 21B may be integrated with the stem 21A or fixed to it at the end opposite to the tip 21C.

Referring to FIG. 3, the stem 21A is substantially L-shaped in plan view, with the bent portion opposite the chip breaking element 21B being fixed to the front wall 2a of the base 2 by bolts 24, and the chip breaking element 21B is orientated in a substantially tangential direction to the front side of the rotation direction of the outer periphery 14A of the annular blade 8 of the main body 14 of the annular blade 8 of the annular blade 8.

Apart from this, the chip breaking element 21B may be directed to the axial center 14B of the main body 14 as shown in FIG.

Alternatively, the chip breaking element 21B may be directed between the shaft center 14B of the main body 14 and the contact point of the outer circumference 14A of the main body 14 as shown by the three-dot chain line in FIG.

In the embodiment of Fig. 4, the stem 21A is in line with the chip breaking element 21B and has a long hole 22 extending in the longitudinal direction of the chip breaking element 21B.

The right front corner of base 2 is obliquely cut to form inclined surface 2A, where stem 21A is fixed by bolt 22 through long hole 22.

Since the long holes 22 are provided, the distance between the tip 21C of the chip breaking element 21B and the outer circumference 14A of the main body 14 can be set appropriately.

In FIG. 5, the adjustment wedge 25 can be inserted between the inclined surface 2A and the stem 21A so that the chip breaking element 21B is directed between the shaft center 14B of the main body 14 and the contact of the outer peripheral 14A of the main body 14.

The wedge angle α is selected to be a size suitable for the direction of the chip breaking element 21B.

The operation will be described below.

The punching machine is driven to start punching on the workpiece 1 as the annular blade 8.

As the annular blade 8 penetrates deeply into the workpiece 1, the chip 18 cut out from the workpiece 1 is pushed out of the chip discharge groove 16 and wound around the outer periphery 14A of the main body 14 of the annular blade 8.

However, the chip 18 spreads under centrifugal force and impinges on the front face in the direction of the annular blade 8 of the chip breaking element 21B.

Chips 18 that have hit the chip breaking element 21B by the rotation of the annular blade 8 pass through the gap 23 between the adjacent chip breaking elements 21B with their intermediate portions, while their leading edges remain in front of the chip breaking element 21B.

Subsequently, the chip 18 is pulled into small pieces so that most of them exit the back side of the chip breaking element 21B of the work piece 1.

These segmented chips are gathered in this area and are captured at some of the tips of the chip 18 which are not yet separated from the main body 14, rotated around the main body 14 and hit the front surface of the chip breaking element 21B again to escape the cutting area of the annular blade 8 Is moved toward the right side of base 2.

As described above, in the chip breaker device according to the present invention, the chips 18 are cut before winding with a large number of worms on their annular blade 8 or strongly entangled, so that the chip 18 does not close the chip discharge groove 16, and the workpiece 1 It is possible to smoothly discharge them out of the annular groove 17 formed in the through the chip discharge groove 16.

As long as the chip breaker device of the present invention is located in the area where the chip 18 spreads by the centrifugal force, collides with the chip breaking element 21B, and is captured by them, the circular blade 8 used in reality may be replaced with another circular blade having a different diameter. It is not necessary to readjust the distance between the tip 21C of the chip breaking element 21B and the outer circumference 14A of the main body 14 of the annular blade 8.

Therefore, this chip breaker device can be used for cutting the chip 18 by a plurality of annular blades 8 having different diameters without changing the position with respect to the annular blade 8.

However, in this case, in order not to contact or collide with the tip 21C of the chip breaking element 21B and the outer circumference 14A of the main body 14 of the annular blade 8, the proper distance between the outer circumference 14A of the annular blade having the largest diameter and the tip 21C of the chip breaking element 21B. You need to install

The comb-like member 21 is usually a hard metal material such as steel or cast iron, but any hard material can be selected without being limited thereto.

The number, thickness and spacing 23 of the chip breaking element 21B is selected according to the cutting conditions such as the cutting efficiency of the annular blade 8, the thickness of the chip 18 and the width and cutting speed.

This cutting condition, especially the spacing 23, does not need to be so precise, and may be selected so that the chip 18 does not collect very much on the chip breaking element 21 ^B and the combing and chip cutting are performed smoothly. .

Claims (8)

A stem extending parallel to the hollow cone-shaped body of the annular blade and at least three long and thin chip breaking elements extending from this stem to the vicinity of the outer periphery of the body at right angles to the stem and spaced apart in the axial direction of the body. Chip breaker device for an annular blade, characterized in that. The apparatus according to claim 1, wherein the stem and the chip breaking element are integrally formed. The device according to claim 1 or 2, wherein the chip breaking element is installed so as to be directed toward the axis of the main body of the annular blade. The device according to claim 1 or 2, wherein the chip breaking element is installed so as to be oriented in the tangential direction of the outer circumference of the main body of the annular blade. Claim 1 or 2 of the utility model registration claim characterized in that the chip breaking element is arranged so as to direct a region between the direction of the main shaft axis of the annular blade and the tangential direction of the outer periphery of the main body of the annular blade. Device described in. The utility model registration claim of claim 1, wherein an adjustment wedge is provided between the place where the stem of the annular blade is mounted to fix the stem and the direction of directing the chip breaking element. The apparatus according to any one of claims 1 to 5. The apparatus according to claim 1, wherein the tip of the breaking element is formed on a plane parallel to the outer circumference of the annular blade. The apparatus according to any one of claims 1 to 7, wherein the utility model registration claim is adjustable according to the chip breaking element.