JP4129712B2 - Pin mirror cutter - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a pin mirror cutter that processes, for example, a crankshaft of a reciprocating internal combustion engine.
[0002]
[Prior art]
As a tool for processing a crankshaft of a reciprocating internal combustion engine, for example, a pin mirror cutter as shown in FIG. 8 is known.
The pin mirror cutter 1 has a plurality of throw-away tips (hereinafter abbreviated as “tips”) 4 having cutting edges 3 on the inner peripheral portion of an annular cutter body 2, and mounting bolts along the circumferential direction. 5 is detachably attached.
[0003]
The pin mirror cutter 1 is attached to the cutter attachment portion 7 of the processing machine 6 shown in FIG. 9 so that the axis line coincides with the main shaft (not shown), and the crankshaft spanned between the chucks 9 and 10 is an inner space portion. In this state, the crankshaft rotates around its own axis while moving in the axial direction of the crankshaft and revolves around the axis of the crankshaft, thereby processing the crankshaft into a predetermined shape.
[0004]
At this time, if the cutter body 2 is not coaxially attached to the cutter attachment portion 7, the pin and journal of the crankshaft cannot be processed into a perfect circle.
[0005]
Therefore, the cutter mounting portion is formed by fitting the key member 12 into the recessed fitting portion (not shown) formed in the inner peripheral portion of the cutter mounting portion 7 and the key groove 11 formed in the outer peripheral portion of the cutter body 2. The radial movement of the cutter body 1 with respect to 7 is restrained, and the coaxiality is increased.
Further, if the inner wall of the key groove 11 is worn due to long-term use, play (gap) is generated and the centering accuracy is deteriorated. To prevent this, the inner wall portion of the key groove 11 is made of cemented carbide. The cemented carbide member 13 was brazed.
[0006]
[Problems to be solved by the invention]
However, when the cemented carbide member 13 is brazed to the cutter body 2, there is a drawback in that the rigidity of the cutter body 2 is lowered in the vicinity of the brazed portion, resulting in a decrease in rigidity.
In addition, if the member to be brazed to the cutter body 2 is made of a cemented carbide, it has excellent wear resistance, but there is also a drawback that defects, cracks, etc. occur.
[0007]
The present invention has been made in view of the above circumstances, and an object thereof is to increase the coaxiality between the cutter body and the cutter mounting portion without causing a reduction in rigidity of the cutter body.
[0008]
[Means for Solving the Problems]
In order to solve the above problems, the present invention employs the following configuration. The invention of claim 1 is a pin mirror cutter that is coaxially mounted on a cutter mounting portion of a processing machine and performs processing with a cutting blade while rotating about the axis together with the cutter mounting portion. A cutting edge is arranged on one peripheral portion, and a concave groove is formed on the other peripheral portion to which a centering member that restrains radial movement with respect to the cutter mounting portion is fitted, and the inner wall of the concave groove parts, said than cutter body Ri reinforcing member of the high hardness name is detachably mounted by a clamp screw, the other on the peripheral portion notch formed by notching the cutter body in a radial direction is formed, The cutout portion penetrates the other peripheral portion in the thickness direction at the central portion along the circumferential direction of the cutter body, and the other peripheral portion at the thickness portion at both end portions along the circumferential direction. It is structured to cut almost half in the direction The reinforcing member is formed in an L shape in a side view that can be fitted along the wall surface of the stepped portion formed by cutting out the other peripheral portion substantially in the thickness direction, and is formed on the stepped portion. Is formed with a female screw portion for screwing the clamp screw, and a through hole through which the clamp screw passes is formed in one side portion constituting the L-shape of the reinforcing member. The other side part which comprises the character comprises the inner wall part of the said ditch | groove .
[0009]
In this configuration, since the reinforcing member is attached to the cutter main body using the fixing means, the rigidity of the cutter main body is not lowered due to the thermal effect as in the case of brazing attachment. The inner wall part of a ditch | groove can be comprised.
In addition, when the inner wall portion of the groove is worn due to long-term use, it is only necessary to replace the reinforcing member constituting the inner wall portion, and the replacement work becomes extremely easy.
[0010]
Incidentally, the reinforcing member is equal made of steel, while reinforcing the inner wall of the groove in the reinforcing member, it can be effectively avoided the occurrence of defects or fractures of the reinforcing member itself.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of the present invention will be described with reference to FIGS.
In these drawings, reference numeral 21 denotes a pin mirror cutter, and reference numeral 22 denotes a cutter body. The same reference numerals are used for the same components as those in the above-described conventional technology, and the description thereof is omitted.
[0012]
The cutter body 22 has an annular shape, and the first chip mounting seat is arranged on the inner peripheral surface thereof at regular intervals along the circumferential direction and in a staggered arrangement on both end faces 22A and 22B. 23 is formed.
A chip pocket 24 is formed on the front side of each of the chip mounting seats 23 in the cutter rotation direction (the white arrow in FIG. 1), in which the inner peripheral surface of the cutter body 22 is removed in a concave shape.
[0013]
Second tip mounting seats 25 are formed in the inner peripheral portion of the end surface of the cutter body 22 so as to be arranged at regular intervals along the circumferential direction and in a staggered arrangement between the end surfaces 22A and 22B. A chip pocket 26 is also formed on the front side in the rotational direction of the chip mounting seat 25 as described above.
A tip 4 having a cutting edge 3 is detachably attached to each tip mounting seat 23, 25 by a mounting bolt 5.
[0014]
On the other hand, key grooves (concave grooves) 31 are formed in the outer peripheral portion 22a of the end surface of the cutter body 22 so as to be arranged at intervals of 90 ° along the circumferential direction.
The key groove 31 has a steel block (reinforcing member) 33 having a rigidity higher than that of the cutter body 22 in a notch 32 formed by cutting the outer peripheral surface 22C of the cutter body 22 radially inward to a predetermined depth. The fixing means 34 is detachably mounted.
That is, the inner wall portion of the key groove 31 facing forward and backward in the cutter rotating direction is constituted by the steel block 33.
[0015]
The notch 32 penetrates the end surface outer peripheral portion 22a in the thickness direction at the central portion along the circumferential direction of the cutter body 22, but the end surface outer peripheral portion 22a at both end portions along the circumferential direction of the cutter main body 22. In the thickness direction.
A female screw portion 36 to which the clamp screw 34 is screwed is formed in a step portion 35 formed by cutting out the outer peripheral portion 22a of the end surface substantially half in the thickness direction.
[0016]
As shown in FIGS. 4 to 6, the steel block 33 is formed in an L shape in side view that can be fitted along the wall surface of the step portion 35, and has one long side constituting the L shape. A through hole 37 through which the clamp screw 34 passes is formed in the portion 35a.
Then, when the steel block 33 is fitted into the notch 32, the clamp screw 34 is passed through the through hole 37 and screwed into the female screw portion 36, the other short part constituting the L-shape of the steel block 33 is obtained. An inner wall portion of the keyway 31 is configured by the side portion 35b.
[0017]
The inner peripheral portion of the cutter mounting portion (FIG. 9) provided on the processing machine (FIG. 9) side is also arranged at 90 ° intervals along the circumferential direction corresponding to the key groove 31 of the cutter body 22. In this way, a recessed fitting portion (not shown) is formed.
Accordingly, by fitting the rectangular plate-shaped key member (centering member) 12 into the key groove 31 formed on the outer peripheral portion of the cutter body 22 and the concave fitting portion formed on the inner peripheral portion of the cutter mounting portion. The radial movement of the cutter main body 22 with respect to the cutter mounting portion is restricted, and the coaxiality is increased.
[0018]
In the present embodiment, the steel block 31 is attached to the cutter main body 22 using the clamp screw 34, so that the rigidity of the cutter main body 22 is not lowered due to the thermal effect as in brazing attachment. The inner wall portion of the groove 31 can be constituted by the steel block 31 having a hardness higher than that of the cutter body 22.
As a result, it is possible to effectively avoid the play due to the inner wall wear of the key groove 31 while maintaining the cutter body 22 with high rigidity, and to process the pin and journal of the crankshaft into a highly accurate circle. Is possible.
[0019]
Further, when the inner wall portion of the groove 31 is worn due to long-term use, only the steel block 33 constituting the inner wall portion needs to be replaced. It can be performed very easily only by attaching and detaching.
Furthermore, since the inner wall portion of the groove 31 is made of steel, it is possible to effectively avoid the occurrence of defects, cracks and the like while reinforcing the inner wall portion of the groove 31.
[0020]
In the present embodiment, the so-called internal type pin mirror cutter 21 in which the cutting blades 3 are arranged on the inner peripheral surface of the cutter main body 22 has been described. However, the cutting blades 3 are arranged on the outer peripheral surface of the cutter main body 22. It goes without saying that the present invention can also be applied to the so-called external type pin mirror cutter.
[0021]
【The invention's effect】
As is clear from the above description, according to the present invention, the following effects can be obtained.
(1) By attaching the reinforcing member to the cutter main body using the fixing means, the inner wall portion of the concave groove is reinforced without causing a reduction in rigidity of the cutter main body due to a thermal effect as in brazing attachment. Therefore, it is possible to effectively avoid rattling due to wear of the inner wall of the concave groove while maintaining the cutter body with high rigidity, and to process the workpiece into a highly accurate circle.
[0022]
(2) When the inner wall portion of the groove is worn due to long-term use, only the reinforcing member constituting the inner wall portion needs to be replaced, and the replacement work is extremely easy.
(3) With the configuration in which the reinforcing member is made of steel, it is possible to effectively avoid the occurrence of defects, cracks, and the like of the reinforcing member while reinforcing the inner wall portion of the concave groove with the reinforcing member.
[Brief description of the drawings]
FIG. 1 is a plan view showing a main part of a pin mirror cutter according to an embodiment of the present invention.
FIG. 2 is an enlarged plan view of a part of FIG.
FIG. 3 is a view taken in the direction of arrow A in FIG. 2;
FIG. 4 is a rear view of the steel block.
FIG. 5 is a side view in which a part of a steel block is broken.
FIG. 6 is a plan view of a steel block.
FIG. 7 is a plan view showing the main part of the cutter body.
FIG. 8 is a plan view showing a main part of a conventional example of a pin mirror cutter.
FIG. 9 is a schematic configuration diagram of a processing machine to which a pin mirror cutter is attached.
[Explanation of symbols]
3 Cutting blade 6 Processing machine 7 Cutter mounting part 12 Key member (centering member)
21 Pin mirror cutter 22 Cutter body 31 Key groove (concave groove)
33 Steel block (reinforcing member)

Claims (1)

A pin mirror cutter that is coaxially mounted on a cutter mounting portion of a processing machine and performs processing with a cutting blade while rotating around the axis together with the cutter mounting portion,
Cutting blades are arranged on one peripheral part of the annular cutter body, and a concave groove is formed on the other peripheral part for fitting a centering member that restrains radial movement relative to the cutter mounting part. Become
Inner wall of the groove is Ri Na reinforcing member having a high hardness is detachably mounted by a clamp screw than the cutter body,
The other peripheral portion is formed with a cutout portion formed by cutting out the cutter body in the radial direction, and this cutout portion has a thickness at the center portion along the circumferential direction of the cutter body. In the both ends along the circumferential direction, the other circumferential portion is cut substantially half in the thickness direction.
The reinforcing member is formed in an L shape in a side view that can be fitted along the wall surface of the stepped portion formed by cutting out the other peripheral portion substantially in the thickness direction, and is formed on the stepped portion. Is formed with a female screw portion for screwing the clamp screw, and a through hole through which the clamp screw passes is formed in one side portion constituting the L-shape of the reinforcing member. A pin mirror cutter, characterized in that an inner wall portion of the groove is formed by the other side portion constituting the character.

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