JPH11277321A - Cutter for machining crankshaft and finishing tooth tip - Google Patents

Abstract

PROBLEM TO BE SOLVED: To give the adjust function of a tip assembly accuracy, in a cutter for machining the pin journal of a crankshaft constituted by a rough tooth tip and finishing tooth tip. SOLUTION: The seat of a throwaway tip 2 is constituted by receive pieces 10 for supporting the throwaway tip 2 in the radius direction of a cutter main body 1 and a bottom plate 12 supported in the width direction of the cutter main body 1. A projection projected more outside than the seat surface is provided on the bottom plate 12 which is the seat of a finish edge tip 4 and this projection is fixed by the push-pressing of a keep piece 17. By changing the bottom plate 12 with a slightly different plate thickness prepared advancely, the edge position can be adjusted minutely and easily.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a throw-away tip seating portion and a finishing blade tip in a crankshaft processing cutter in which a cutting edge is formed by a rough blade tip and a finishing blade tip.

[0002]

2. Description of the Related Art One of the processes for manufacturing a crankshaft, which is a main component of an automobile engine or the like, is a process of forming side surfaces of both ends of a pin journal and a shallow groove process which is connected to the both ends and is generally called an undercut. There is. Conventionally, the machining of the portion has been divided into two processes, a process of milling the side surface of the pin journal using a crankshaft mirror, and a process of performing finishing and groove machining by turning. However, in the turning process, indexing of pin journals having different phases is troublesome, and since the process is divided into two processes, mechanical devices,
Additional locations, operators, etc. are required. Therefore,
A demand has arisen to combine these to increase processing efficiency.

[0003] As a relatively new technology that satisfies such demands, a technology has been developed in which the side surface processing and groove processing of both ends of a pin journal can be performed with a single cutter. For example, Japanese Utility Model Laid-Open No. 6-57513 discloses a cutter device for a crankshaft mirror. This cutter is composed of a rough blade tip for simultaneously performing rough processing on the side surfaces of both ends of the pin journal and a groove on the tip end, and a finishing blade chip having a part thereof replaced. A wiping blade is formed on the finishing blade chip as a cutting blade for side processing, and the wiping blade is used to finish the wiping.

[0004] This type of cutter usually has a structure in which a throw-away tip (hereinafter referred to as a tip) is mounted on the cutter body in an upright insert state, and is screwed and fixed using a countersink hole formed in the center of the tip. It has become. And
As exemplified in the above publication, many of the prior arts
The tip is directly assembled and fixed to the tip seating portion cut out in the cutter body.

Next, the positional relationship between the finishing blade tip and the coarse blade tip will be described with reference to FIG. 11 which is a prior art example. As shown in this drawing, the finishing blade tip 4 is placed with its tip retreated from the rough blade tip 3 in the radial direction of the cutter body 1, and in the width direction of the cutter body 1, the finishing blade tip 4 The blade 20 is mounted so as to project slightly outward from the rough blade tip 3. The rough blade tip 3 performs groove processing after processing the side surface of the pin journal. The wiping blade 20 provided on the finishing blade tip 4 polishes and finishes the side surface previously processed by the rough blade tip 3.

[0006] In order to obtain a good finished surface, the scouring blade 20 is usually laid flat against the side surface. At this time, if the blade length of the razor blade 20 is longer than necessary, the distance for rubbing against the processing surface becomes too long, which not only roughens the processing surface against the purpose, but also reduces the life of the chip and the occurrence of vibration. Will be invited. In order to prevent this, it is necessary to leave the predetermined blade length and remove the further cutting blades to make them non-contact. Conventionally, as shown in this figure, this is realized by forming a cutting edge portion to be brought into non-contact with a step surface having a uniformly low level.

[0007]

The finishing blade tip in the side surface finishing of the pin journal projects slightly from the rough blade tip in the width direction of the cutter body as described above, so that the set minute cutting amount is reduced. Must be secured. Furthermore, the width accuracy between the finishing blade tips arranged on both side surfaces of the cutter body requires exceptionally high accuracy. On the other hand, with regard to grooving, the cutting load of each cutting edge is made uniform by maintaining good runout accuracy in the radial direction of the tip of the coarse blade tip, chip loss, chip life reduction, generation of vibration, It is necessary to suppress deterioration and the like.

[0008] In order to obtain such a high precision of assembling the chip, in the above-described directly-fixed type crankshaft processing cutter, the accuracy of both the cutter body and the chip alone must be increased. In other words, there is no way to adjust the manufacturing accuracy as it is directly reflected on the chip assembly accuracy. In addition, there is also a problem that when a chip loss occurs, the cutter body is damaged.

In order to solve the above-mentioned problems, some techniques have been proposed in which a chip is mounted on a cartridge provided with a fine adjustment mechanism and this cartridge is incorporated into a cutter body. However, since the cartridge has a built-in fine adjustment screw and the like, the size of the cartridge body becomes large, and the storage space provided in the cutter body for storing the cartridge must be large, and the width of the cartridge is thin. The cutter has a problem that rigidity is reduced. In addition, the fine adjustment operation using the cartridge actually requires considerable skill and requires a lot of time and labor.

On the other hand, with regard to the shape of the finishing blade tip, the conventional finishing blade tip as described above has a rake face and a seating face which are fixed to one side, respectively. It was small and uneconomical.

[0011]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and a throw-away tip is mounted on both sides of a peripheral portion of a disk-shaped cutter body in an upright insert state. In the crankshaft processing cutter in which the throw away tip is formed by a combination of a rough blade tip and a finishing blade tip, a seating portion of the throw away tip includes the throw away tip in the cutter body. It is characterized by being formed with a receiving piece that supports in the radial direction and a floor board that supports in the width direction of the cutter body, and by removing the receiving piece and the floor board from the cutter body and modifying it, the chip The purpose is to easily assemble the precision. In addition, parts having slightly different dimensional accuracy are prepared in advance, and it is also possible to cope with them by replacing parts. At the same time, when a chip loss occurs, the damage around the chip is prevented from spreading to the outside of the receiving piece or the floor plate, so that the cutter body is prevented from being damaged.

According to a second aspect of the present invention, the bottom plate at the seating portion of the finishing blade tip is provided with a projection protruding outward from the seating surface, and the bottom plate is attached to the cutter body by pressing the projection with a pressing piece. It is characterized by being fixed, and provides a new fixing method for small parts that are difficult to fix.

According to a third aspect of the present invention, a holding piece tightening screw is inserted into the holding piece, and an O-ring is externally inserted into the holding piece tightening screw at a position between the holding piece and the cutter body. The purpose of the present invention is to prevent intrusion of chips, dust and the like into the screw portion of the holding piece tightening screw.

According to a fourth aspect of the present invention, there is provided a finishing blade having a rectangular flat plate shape, which is mounted on a crankshaft processing cutter in a vertical insert state together with a rough blade tip. The main ridge line is provided with a wiping blade having a desired cutting edge length from the tip corner, and the rear end is subjected to cutting edge removal along the main ridge line, and is formed on the finishing blade tip. The width of the cutting edge removal is formed so as to become wider as the distance from the front end corner side increases, and the finishing blade tip is provided with a small notch at the rear end of the wiping blade. The removal is characterized in that the starting point is inside the notch. Specifically, the cutting edge is removed by chamfering or stepping.

[0015] The finishing blade tip formed as described above, even if the flat blade is set flat with respect to the side surface machining surface by the axial rake angle and the radial rake angle set to the negative angle, , Escape occurs in the part except the razor blade, so that it does not come into contact with the machined surface. In addition, a wide flat surface is secured on the square flat plate surface of the finishing blade tip, and the shape is such that the seating stability is not impaired even when the surface is mounted upside down. The shape of the cutting blade is also a shape that can be used when the surface is turned upside down. In addition, the notch provided when setting the cutting edge length of the flat blade is designed to absorb the manufacturing variation at the starting point of the cutting edge removal that occurs when there is no notch in the notch, so that the cutting edge length is set. Is to be set without fail.

[0016]

Next, an embodiment of the present invention will be described with reference to the drawings.

FIGS. 1 to 10 show an embodiment of the present invention. FIG. 1 is a perspective view of a cutter body 1 with a substantially quarter circle taken out. The cutter body 1 is formed in a disk shape, but has a large hollow circle in the center, and thus has a ring shape in appearance. A plurality of indexable tips (hereinafter referred to as tips) 2 are arranged on both sides so as to sandwich the cutter body, and are detachably attached to the inner peripheral edge of the ring. The tip 2 is composed of a combination of the rough blade tip 3 and the finishing blade tip 4, and is entirely configured such that several finishing blade tips 4 are mixed in the majority of the rough blade tips 3. The tip 2 is mounted in an upright insert state from both sides of the cutter body 1. In this figure, the seating portion of the finishing blade tip 4 is drawn with some parts disassembled for understanding the configuration. .

FIGS. 2 and 3 show one mounting portion of the rough blade tip 3. FIG. The cutter body 1 is provided with a notch step portion 5 in which a chip mounting component is stored and a chip pocket 6 for promoting chip outflow.

The rough blade tip 3 has a substantially rectangular flat plate appearance, and a countersink hole 7 is formed at the center of the flat plate surface symmetrically from the front and back surfaces. By screwing the tip tightening screw 8 inserted in the countersunk hole 7 with the screw hole provided in the cutter body 1,
The rough blade tip 3 is tightened and fixed.

The two long sides of the rough blade tip 3 which is a substantially rectangular flat plate have a parallelogram shape, and an arcuate cutting edge is formed at the acute angle corner. In the vertical insert, the side surface becomes the rake surface 9 at the time of cutting. If this rough blade tip 3 is rotated by 180 ° on the same rake face, the other acute angle corner becomes the used cutting edge. In addition, if the front and back surfaces are inverted with respect to the flat surface, the rear surface of the rake surface 9 can be used as a rake surface by mounting the cutter body 1 on the other side surface.

A receiving piece 10 for supporting the rough blade tip 3 is provided in the radial direction of the cutter body 1, and is detachably fixed to the cutter body 1 by a receiving piece tightening bolt 11. Further, in the width direction of the cutter body 1, a floor plate 12 is sandwiched between the rough blade tip 3 and the cutter body 1, and the floor plate 12 is formed so as to be a seat portion of the rough blade chip 3. The base plate 12 is provided with a through hole 13 through which the chip tightening screw 8 can pass, and a stepped hole 14 separately from the through hole 13. A small screw 15 is inserted into the stepped hole 14 and screwed into the cutter body 1 so that the floor plate 12 is detachably fixed to the cutter body 1.

FIGS. 4 to 6 show one mounting portion of the finishing blade tip 4. FIG. The cutter body 1 is provided with a notch step portion 5 in which a chip mounting component is stored and a chip pocket 6 for promoting chip outflow.

The finishing blade tip 4 has a substantially rectangular flat shape in appearance, and a countersink hole 7 is formed at the center of the flat plate surface symmetrically from the front and back surfaces. By screwing the tip tightening screw 8 inserted in the countersunk hole 7 with the screw hole provided in the cutter body 1,
The finishing blade tip 4 is tightened and fixed. The two long sides of the finishing blade tip 4 forming a substantially rectangular flat plate have a rectangular shape, and arcuate corners are formed at the two corners at the opposite ends. In the vertical insert, the side face is the rake face 9 during cutting,
The circular corner side is the cutting edge used for cutting. The other two corners are formed in a chamfered shape.

A receiving piece 10 for supporting the finishing blade 4 is disposed in the radial direction of the cutter body 1, and is detachably fixed to the cutter body 1 by a receiving piece tightening bolt 11. In the width direction of the cutter body 1, the floor plate 12 is sandwiched between the finishing blade tip 4 and the cutter body 1 so that the finishing blade tip 4
It has a seating section. The base plate 12 is provided with a through hole 13 so that the chip fastening screw 8 can pass therethrough. The sole plate 12 is provided with a projection 16 projecting outward from the seating surface of the finishing blade tip 4.

A holding piece 17 is provided adjacent to the floor plate 12. One end of the holding piece 17 is brought into contact with the projection 16, and the projection 16 is pressed by the fastening force of the holding piece tightening screw 18 inserted into the holding piece 17 and screwed to the cutter body 1. The floor plate 12 is detachably fixed to the cutter body 1. Base plate 12 for finishing blade tip 4 and rough blade tip 3
The reason why a different fixing method was adopted for the floor plate 12 for
Due to the difference in the position of the cutting edge between the rough blade tip 3 and the finishing blade tip 4, which will be described later, the two chip lengths are different, and the bottom plate 12 serving as the seating surface of the finishing blade tip 4 having a short tip length has a screw. This is because a space for stopping cannot be secured.

An O-ring 19 is externally inserted into the holding member tightening screw 18 at a position between the holding member 17 and the cutter body 1 so that the O-ring 19 comes into close contact with the holding member 17 and the cutter body 1.
Prevent cutting chips and dust from entering the screw holes of the holding piece tightening screw 18.

7 to 9 show the finishing blade tip 4. FIG. A razor blade 20 for finishing the side surface during the processing of the crankshaft is provided at two opposite corners on the rake face 9. A notch 21 substantially perpendicular to the cutting blade is provided at the rear end of the wiping blade 20 so that the wiping blade 20 is set to a desired cutting blade length by the notch 21. At this time, the appropriate length of the wiping blade is determined by the relationship between the feed per rotation and the number of blades. If the cutting blade length is too long, the distance of the rubbing without any cutting action will be too large, and the effect as a razor blade will be weakened, rather deteriorating the machined surface, shortening the life of the insert, generating vibration, etc. Will be invited.

A cutting edge removal 22 is provided on the extension ridge of the wiping blade 20 along this ridge line, and the cutting edge is deleted. The shape of the cutting edge removal 22 is a stepped shape as shown in this figure in addition to the chamfering. The cutting edge removal 22 is formed so that its width gradually becomes wider as the width thereof becomes more distant from the tip corner side. By setting the starting point in the space of the notch 21, the manufacturing variation of the starting point is reduced by the notch 2.
1 and the cutting edge length of the wiping blade 20 is kept constant.

Since the finishing blade tip 4 is basically a negative tip, both the axial rake angle and the radial rake angle are attached to the cutter body 1 at negative angles. Therefore, even if the scouring blade 20 is installed so as to be flat with respect to the processing surface, all the portions of the finishing blade tip 4 other than the cutting blade portion, including the cutting blade removal 22, escape, and the clearance between the cutting surface and the processing surface is reduced. Contact is avoided. In addition, the shape of the cutting edge removal 22 that becomes gradually wider as the distance from the leading edge corner side increases, so that the area of the cutting edge removal 22 is minimized, but the escape is reliably achieved. .

The finishing blade tip 4 has a point-symmetrical shape on the rake face 9 and a left-right symmetrical shape when viewed from the flat surface, and the flat shape on the flat surface by forming the cutting edge removal 22 as described above. Is secured widely, so that the seat can be mounted upside down without impairing the stability of seating. The shape of the cutting blade is also a shape that can be turned upside down. That is, when the finishing blade tip 4 is rotated by 180 ° with respect to the same rake face 9, the other corner becomes the used cutting blade. At the same time as turning the front and back of the flat plate surface, by mounting it on the other side surface of the cutter body 1, the back surface of the rake surface 9 can be used as a rake surface. The use of four cutting blades becomes possible.

FIG. 10 is a simplified sectional view for explaining the positional relationship between the rough blade tip 3 and the finishing blade tip 4. As shown in FIG. The rough blade tip 3 drawn by an imaginary line is mounted with a slight inclination from the tip end to the rear end with respect to the side surface of the cutter body 1 to set a relief. On the other hand, the finishing blade tip 4 is set such that the wiping blade 20 is flat with respect to the side surface of the cutter body 1, but as described above, relief is provided on other ridge lines and surfaces. In the radial direction of the cutter body 1, a rough blade tip 3 is provided so as to protrude from the finishing blade tip 4, and performs side processing and shallow groove processing of the pin journal. In the width direction of the cutter body 1, the finishing blade tip 4 is set to protrude laterally from the rough blade tip 3 by an amount of the finishing allowance. Since the cutting feed is sent toward the center of the cutter body 1, the finishing blade tip 4 follows the surface of the rough blade tip 3 formed by the arcuate cutting blade, and the scouring blade 20 finishes the cutting.

According to the present invention, since the rough blade tip 3 and the finishing blade tip 4 are supported by the detachable receiving piece 10 and the floor plate 12, these parts are replaced with other parts having different dimensions. By performing or additional correction, it is possible to adjust the runout accuracy between the cutting blades, the amount of protrusion of the finishing blade tip 4 with respect to the rough blade tip 3, the width between the left and right of the finishing blade tip 4, and the like.

[0033]

According to the cutter for machining a crankshaft according to the present invention, a compact-sized chip seating part is detachably interposed between the throw-away tip and the cutter body, so that the cutter body can be removed. The rigidity is not impaired, and the function of adjusting the insertion accuracy of the throw-away tip can be provided by replacing the tip seating part. Because the structure of the tip seating part is simple,
A desired installation accuracy can be obtained in a relatively short time, and an adjustment operation can be performed while the cutter is attached to the machine.

According to the finishing blade tip according to the present invention incorporated in a cutter for machining a crankshaft, since it has a shape capable of reversing the front and back, the cutting edge is twice as large as the conventional finishing blade tip. The number of blades can be obtained and it is economical.

[Brief description of the drawings]

FIG. 1 is a partial perspective view showing an embodiment of a crankshaft processing cutter of the present invention.

FIG. 2 is a side view of a rough blade tip portion mounted in FIG. 1;

FIG. 3 is a sectional view taken along line AA of FIG. 2;

FIG. 4 is a side view of the finishing blade tip attached to FIG. 1;

FIG. 5 is a sectional view taken along the line BB in FIG. 4;

FIG. 6 is a sectional view taken along the line CC of FIG. 4;

FIG. 7 is a side view showing one embodiment of a finishing blade tip for processing a crankshaft of the present invention.

FIG. 8 is a front view of FIG. 7;

FIG. 9 is a perspective view of the finishing blade tip shown in FIG. 7;

10 is a simplified cross-sectional view for explaining the relationship between the rough blade tip and the finishing blade tip shown in FIG.

FIG. 11 is a simplified cross-sectional view for explaining the relationship between a conventional rough blade tip and a finishing blade tip.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cutter main body 3 Coarse blade tip 4 Finishing blade tip 9 Rake surface 10 Receiving piece 12 Floor plate 16 Projection 17 Pressing piece 19 O-ring 20 Bleed blade 21 Notch 22 Cutting edge removal

Claims (6)

[Claims] 1. A throw-away tip is placed and fixed in an insert state on both sides of a peripheral edge portion of a disk-shaped cutter body, and the throw-away tip comprises a rough blade tip and a finishing blade tip. In the cutter for machining a crankshaft constituted by a combination of the above, the seating portion of the throw-away tip includes a receiving piece that supports the throw-away tip in the radial direction of the cutter body and a bottom plate that supports the throw-away tip in the width direction of the cutter body. A crankshaft processing cutter characterized by being formed in advance. 2. A mounting plate provided at a seating portion of the finishing blade tip is provided with a protrusion protruding outward from a seating surface, and the mounting plate is fixed to the cutter body by pressing the protrusion with a pressing piece. The cutter for machining a crankshaft according to claim 1, wherein: 3. A holding piece tightening screw is inserted into the holding piece, and an O-ring is externally inserted into the holding piece tightening screw at a position between the holding piece and the cutter body. The crankshaft machining cutter according to claim 1 or 2, wherein: 4. A finishing blade tip, which is formed in a rectangular flat plate shape and is mounted on a crankshaft cutter together with a rough blade tip in an upright insert state, a main ridge line serving as a side cutting edge of the finishing blade tip has a tip. A finishing blade tip, characterized in that a cutting blade is provided at a desired cutting edge length from a corner and a cutting edge is removed at a rear end thereof along a main ridgeline. 5. The finishing blade according to claim 4, wherein the width of the cutting edge removal formed on the finishing blade tip increases as the distance from the tip corner side increases. Chips. 6. The finishing blade tip according to claim 4, wherein a small notch is provided at a rear end of the wiping blade, and the cutting edge is removed starting from inside the notch. Finishing blade tip according to 1.