KR100624744B1 - Insert tip for pin miller cutter - Google Patents

Abstract

The present invention relates to a pin miller cutter, and more particularly, to an insert tip for a pin miller cutter detachably mounted to a pin miller cutter body for machining a crankshaft of a reciprocating internal combustion engine.

The present invention is detachably fixed to the plurality of pockets formed along the inner circumferential front and both sides of the annular cutter body (2) protruding at a predetermined angle to the inner circumferential front and both sides by a bolt so as to be detachably fixed. And the cutter tip 2 comes into contact with the surface of the workpiece when the cutter body 2 enters the workpiece side, and the insert tip 100 for the pin miller cutter is cut. The insert tip 100 has a horizontal upper surface formed by acute edges. It has a trapezoidal shape consisting of 110 and the horizontal lower surface 120 formed by a pair of obtuse corners facing the horizontal upper surface 110, consisting of a long side and a corner portion (R2) of the horizontal upper surface It has a cheek cutting edge consisting of a pin cutting edge and the corner portion (R1) of the horizontal lower surface, the lower end of the insert tip 100 adjacent to both side edges of the insert tip (100) 100) A hemispherical chip breaker 130 is formed along a straight section from the front side to the rear side.

Insert Tip, Cutter, Pin Miller, Trapezoid, Chip Breaker

Description

Insert tip for pin miller cutter}

BRIEF DESCRIPTION OF THE DRAWINGS The figure which shows the machining state of the crankshaft using the insert tip for conventional pin miller cutters.

Figure 2 is a perspective view showing an insert tip for a conventional pin miller cutter.

3A and 3B are a side view and a front view of a cutter body showing a state where a conventional insert tip for a pin miller cutter is mounted on the cutter body, respectively.

4 is a perspective view showing the insert tip for a pin miller cutter of the present invention.

5A and 5B are a plan view and a bottom view, respectively, of an insert tip for a pin miller cutter of the present invention.

5A and 5B are a side view and a front view respectively showing a state in which the insert tip for the pin miller cutter of the present invention is mounted on the cutter body.

<Explanation of symbols for the main parts of the drawings>

1 ... crankshaft 2 ... cutter body

100.Inserted tip 110 ... Horizontal top

120 ... horizontal bottom 130 ... chip breaker

The present invention relates to a pin miller cutter, and more particularly, to an insert tip for a pin miller cutter detachably mounted to a main body for machining a crankshaft of a reciprocating internal combustion engine.

Generally, a pin miller cutter is used as a cutting tool for processing a crankshaft of a reciprocating internal combustion engine.

As shown in FIG. 1, the pin miller cutter is a device for properly entering the crankshaft 1 while rotating around the crankshaft 1 at a high speed to process the crankshaft into a predetermined shape. Cutter body (2) having an annular inner circumference installed to enter a predetermined distance toward the crankshaft (1) while rotating by rotational force, and the cutter body (2) is fixed to one side of the inner circumference of the cutter body (2) It is provided with an insert tip 3 which performs cutting while in contact with the crankshaft surface when entering the crankshaft 1.

The insert tip (3) is formed so that each cutting edge protrudes at a predetermined angle in the front and both sides of the inner circumference, a plurality of pockets (2a) formed along the front and both sides of the cutter body (2), It is coupled with the cutter body (2) through 2b). The pockets 2a and 2b have a predetermined shape so that the insert tip 3 can be seated at an angle at which the workpiece can be cut under optimum conditions of the workpiece along the front and both sides of the cutter body 2. It has a seating surface and the bolt coupling hole is fastened to the insert fixing bolt passed through the insert tip 3 in the state that the insert tip (3) is seated on the seating surface.

As described above, the cutter body 2 equipped with the insert tip 3 rotates and revolves around the crankshaft to process the crankshaft. The insert tip 3 protruding toward the front of the cutter is mounted on the crankshaft. The pin part P, which is the main shaft of (1), is machined, and the insert tips 3 mounted to protrude toward both sides of the cutter machine the cheek part C of the crankshaft 1. .

At this time, the insert tip (3) should be formed to use all eight corners for efficient use. In addition, when mounting to the pockets (2a, 2b) to be manufactured in a shape that can easily determine the mounting position should be made to prevent the machining of the workpiece.

As shown in FIG. 2, as the insert tip 10 developed to satisfy the above conditions, a "slowaway insert and a pin miller cutter using the same" disclosed in Korean Patent Application No. 2001-46703 are known.

The insert (hereinafter referred to as 'insert tip 10') is manufactured in a parallelogram shape where the obtuse and acute edges face each other. Side portions of the insert tip 10 are formed by two flat surfaces 13a and 13b connected at different angles at one side S. In addition, the upper and lower surfaces 11 and 12 of the insert tip 10 are formed with independent arcuate surfaces 14a and 14b, respectively, to have different radii of curvature along the acute corners and the obtuse corners. These arcuate surfaces 14a and 14b are naturally small toward the side as they progress to the lower surface 12 and the upper surface 11, respectively, and are connected to the two flat surfaces 13a and 13b.

As shown in Figure 3a and 3b, the insert tip 10 having the configuration as described above is fixed along the inner circumference front and both sides of the cutter body 2, of which the front of the inner circumference of the cutter body (2) Insert tips 10 are installed along the alternately installed so that the upper surface 11 and the lower surface 12 respectively face forward, alternately installed alternately in front of both sides of the inner circumference.

In addition, the insert tip 10 installed along both sides of the cutter body 2 has the lower surface 12 and the upper surface 11 facing forward so that the obtuse corner portion cuts the cheek portion C. It is alternately mounted in a staggered manner one by one between the insert tips 10 installed along the inner circumferential front to be a line. In this case, the insert tip 10 provided along the front of the inner circumference of the cutter body 2 is the rake surface of the upper and lower surfaces, the insert tip 10 provided along both sides of the cutter body 2 is Both sides become the rake surface.

According to the conventional insert tip 10 having the above configuration, the insert tip 10 is made in a parallelogram shape, and the edge tip shape of the acute edge and the obtuse corner part is significantly different from the insert tip 100, even with the naked eye. In addition to being able to easily distinguish the mounting position, the pocket portion is formed in different shapes in consideration of the mounting state, thereby preventing confusion caused when the pocket portion is mounted.

In addition, since the pin portion and the cheek portion can be cut at different curvature radii by the acute corners and the obtuse corners formed with corners having different radii of curvature, all eight corner portions are used as necessary.

However, the conventional insert tip 10 having the above-described configuration has two flat surfaces 13a and 13b whose side portions are connected at different angles at one side point S, and along an acute edge and an obtuse corner. It is difficult to manufacture because it has a complicated shape having independent arcuate surfaces 14a and 14b to have different radii of curvature.

In addition, since the insert tips 10 installed on the side of the cutter body 2 have to be mounted to have a negative inclination angle with respect to the radial direction since the cutter body 2 is formed in a parallelogram shape, the cutting tip 10 has a high cutting speed. There is a problem that the precise machining of the workpiece is not made by the resistance.

If the cutting resistance is excessively generated, since the direction of the chip is discharged in the direction of the workpiece, an increase in the load of the cutter and vibration are generated, resulting in poor roughness of the workpiece. This not only causes a problem of poor quality due to poor roughness of the workpiece, but also generates abnormal flow and micro flow continuously to the insert tip 10, resulting in a crack in the insert tip 10, thereby shortening the life of the tool. Leads to problems.

Furthermore, since the crack of the insert tip 10 is minute and difficult to grasp with the naked eye, the management of the insert tip 10 is not only very difficult, but because of this, the insert tip 10 is broken and the operation is stopped by missing the proper tip replacement time. It can also cause serious problems.

The present invention has been made in consideration of the above-described conventional problems, there is no chaos when mounted on the cutter body, and all eight corners can be used, as well as a simple shape for easy manufacturing, and minimize the cutting load to precisely the workpiece. The object is to provide an insert tip for a pin miller cutter that can perform machining.

In order to achieve the above object, the present invention provides a plurality of pockets formed along the inner circumferential front and both sides of the annular cutter body with a bolt so that the cutting edge protrudes at a predetermined angle to the inner circumferential front and both sides. In the insert tip for a pin miller cutter, which is detachably fixed and is in contact with the surface of the workpiece when the cutter body enters the workpiece side, the insert tip is a horizontal upper surface formed by acute edges and the horizontal upper surface. It has a trapezoidal shape consisting of a horizontal lower surface formed by a pair of obtuse corners facing the surface, and has a pin portion cutting edge consisting of a long side and a corner portion of the horizontal upper surface and a cheek cutting edge composed of a corner portion of the horizontal lower surface. At the bottom of the insert tip, the front of the insert tip is adjacent to both edges of the insert tip. Along the straight line section of the stand to the back it characterized in that the chip breaker formed on the semi-spherical.

Further, each corner portion of the horizontal upper surface and the horizontal lower surface is rounded, and the round is formed with the same radius on the same horizontal plane, and is formed with a different radius on the other horizontal plane.

In addition, the acute corner portion of the insert tip is preferably formed to satisfy the range of 65 ° to 85 °, the obtuse corner is preferably formed to satisfy the range of 95 ° to 115 °.

In addition, the insert tips installed along the inner circumferential front surface of the cutter body have a negative inclination angle in the radial direction of the cutter body and a positive inclination angle in the rotation axis direction of the cutter body, and alternately intersect the front left and right sides of the inner circumference alternately. Is installed. The insert tips installed along the inner circumferential sides of the cutter body are disposed to have a positive inclination angle in the radial direction of the cutter body and a negative inclination angle in the rotation axis direction of the cutter body. It is installed alternately between the left and right sides one by one between the inserted insert tips.

In this case, the insert tips installed along both inner circumferential surfaces of the cutter body have a positive inclination angle with respect to the radial direction of the cutter body by the chip breaker.

The features and advantages of the present invention will become more apparent from the following detailed description of preferred embodiments based on the accompanying drawings. Prior to this, the pin miller cutter to which the present invention is applied is the same as the pin miller cutter described in the prior art, so the detailed description thereof will be omitted.

As shown in Figure 4, the pin tip cutter cutter insert 100 of the present invention is a plate-like member, as long as it faces the horizontal upper surface 110 and the horizontal upper surface 110 formed by acute corner portions It has a trapezoidal shape consisting of a horizontal lower surface 120 formed by a pair of obtuse corners. The center of the insert tip 100 is formed with a coupling hole 101 through which the fastening bolt passes when mounted to the cutter body.

A pair of chip breakers 130 adjacent to both edges of the insert tip 100 are formed at the lower ends of the front and rear surfaces of the insert tip 100. The chip breaker 130 has an insert tip 100 having a hemispherical cross section in the thickness direction, and is formed along a straight section from the front surface of the insert tip 100 to the rear surface in the thickness direction of the insert tip 100.

The chip breaker 130 lowers the cutting resistance generated in the insert tip 100 by segmenting the cutting chip discharged from the cheek part during the cutting process. In addition, by the chip breaker 130, the insert tip 100 has a positive inclination angle with respect to the radial direction of the cutter body (2).

In addition, the acute corner portion is formed to satisfy the range of 65 ° to 85 °, the obtuse corner is preferably formed to satisfy the range of 95 ° to 115 °. Such values are optimized values to maximize cutting while minimizing cutting load as a result of various experiments.

5A and 5B, the corner portions R2 and R1 of the horizontal upper surface 110 and the horizontal lower surface 120 are all rounded, and the corner portions R2 and R1 are rounded. It is formed with the same radius on the same horizontal plane, and is formed with a different radius on the other horizontal plane. Accordingly, the long side and the corner portion R2 constituting the front and rear surfaces of the horizontal upper surface 110 form a pin cutting edge, and the corner portion R1 of the horizontal lower surface 120 forms the cheek cutting edge. When processing the corners of the pin portion and the cheek portion can be processed with a different radius, since the corners on the same horizontal plane are all made of the same radius, the shape of the insert tip 100 is simplified and the chip is also easily machined.

As described above, the insert tip 100 of the present invention forms a trapezoidal shape, and the angle difference between the acute corner portion and the obtuse corner portion can be easily visually determined by the horizontal upper surface 110 and the horizontal lower surface 120. The lock is large and, in particular, since the chip breaker 130 is formed on the horizontal upper surface 110, there is no fear of erroneous mounting by confusing the mounting position when mounted on the cutter body.

As shown in Figure 6a and 6b, the insert tip 100 of the present invention is installed on the inner peripheral front and both sides of the cutter body (2).

Insert tips 100 installed along the inner circumferential front surface of the cutter body 2 are arranged to have a negative inclination angle in the radial direction of the cutter body 2 and a positive inclination angle in the rotation axis direction of the cutter body 2. It is installed alternately by alternating the front left and right of the inner circumference.

The insert tips 100 installed along the inner circumferential sides of the cutter body 2 have a positive inclination angle in the radial direction of the cutter body 2 and a negative inclination angle in the rotation axis direction of the cutter body 2. It is disposed, and alternately installed between the left and right sides one by one between the insert tip 100 installed along the front surface of the inner peripheral surface of the cutter body (2).

In particular, the insert tips 100 installed along the inner circumferential sides of the cutter body 2 are fixed in a state where the horizontal lower surface 120 is inclined so as to have a negative inclination angle with respect to the radial direction of the cutter body 2, The chip breaker 130 formed at the corner portion of the horizontal upper surface 110 has an actual positive inclination angle.

According to the present invention, the cutting resistance acting on the insert tip 100 during cutting can be minimized.

That is, the insert tips 100 installed along the inner circumferential front surface of the cutter body 2 for processing the pin portion of the crankshaft and the inner circumferential sides of the cutter main body 2 for processing the cheek part of the crankshaft are installed. In the insert tips 100, a high cutting force is applied to the insert tips 100 during machining, and inserts installed along the inner circumferential front surface of the cutter body 2 may have a positive inclination angle in the rotation axis direction of the cutter body 2. At the same time, since the insert tips 100 installed along the inner circumferential sides of the cutter body 2 have a positive inclination angle with respect to the radial direction of the cutter body 2, chips generated during cutting are discharged in a direction away from the workpiece. Compared with the negative inclination angle, the cutting force is greatly reduced. Reducing the cutting force reduces cutting vibrations, which in turn improves machinability.

In addition, the cutting resistance is further reduced because the chip breaker 130 formed on the side edge of the horizontal lower surface 120 segments the cutting chips generated in the cheek portion during cutting.

According to the present invention, since the left and right are symmetrical and the upper and lower surfaces are formed in a vertical state with respect to the front surface, all eight corner portions can be used in the state arranged in the cutter body 2 as described above. That is, the insert tips 100 installed along the inner circumferential front surface of the cutter body 2 are replaced or flipped to use four corners of the upper part of the insert tip 100, and both sides of the inner circumference of the cutter body 2 are replaced. If you use four corners at the bottom by changing or reversing the positions of the insert tips 100 installed along, it is possible to use all eight corners.

According to the insert tip for a pin miller cutter according to the present invention configured as described above,

First, since the insert tip is mounted to the cutter body to have a positive inclination angle, the cutting load is minimized to reduce cutting vibration, thereby improving cutting property, thereby enabling accurate machining of the workpiece.

Second, the insert tip has a trapezoidal shape, which prevents incorrect mounting due to chaos when mounted on the cutter body, and is easy to process due to its simple shape.

Third, since the left and right sides are symmetrical and the upper and lower surfaces are formed perpendicular to the front surface, it is economical to use all eight corners by changing or reversing the insert tips.

While the invention has been shown and described with respect to specific embodiments thereof, it will be understood that the invention can be variously modified and varied without departing from the spirit or scope of the invention as set forth in the claims below. It should be included in the scope of the invention.

Claims (5)

A plurality of pockets formed along the inner circumferential front and both sides of the annular cutter body are detachably fixed by bolts so that the cutting edge protrudes at a predetermined angle to the inner circumferential front and both sides, and the cutter body is fixed to the workpiece side. In the insert tip for a pin miller cutter, the cutting is made in contact with the surface of the workpiece when entering, The insert tip has a trapezoidal shape consisting of a horizontal upper surface formed by an acute corner portion and a horizontal lower surface formed by a pair of obtuse corner portions facing the horizontal upper surface, and includes a long side and a corner portion of the horizontal upper surface. It has a cheek cutting edge consisting of a pin cutting edge and the corner of the horizontal lower surface, the lower end of the insert tip is formed in a hemispherical chip breaker along a straight section from the front of the insert tip to the rear adjacent to both edges of the insert tip Insert tip for a pin miller cutter, characterized in that. The method of claim 1, Each corner portion of the horizontal upper surface and the horizontal lower surface is rounded, and the round tip is formed with the same radius on the same horizontal plane, the insert tip for the pin miller cutter, characterized in that the different radius on the other horizontal plane . The method of claim 1, An acute corner portion is formed to satisfy the range of 65 ° to 85 °, the insert tip for a pin miller cutter, characterized in that formed obtuse edge portion to satisfy the range of 95 ° to 115 °. The method of claim 1, Insert tips installed along the inner circumferential surface of the cutter body have a negative inclination angle in the radial direction of the cutter body and a positive inclination angle in the rotational axis direction of the cutter body, and are alternately installed alternately between the front left and right sides of the inner circumference. , Insert tips installed along the inner circumferential sides of the cutter body are arranged to have a positive inclination angle in the radial direction of the cutter body and a negative inclination angle in the direction of the axis of rotation of the cutter body, and insert tips installed along the front surface of the inner circumference of the cutter body Insert tip for a pin miller cutter, characterized in that alternately installed left and right sides alternately between. The method according to claim 1 or 4, The insert tips installed along the inner circumferential sides of the cutter body have a positive inclination angle with respect to the radial direction of the cutter body by the chip breaker.

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