JP2553151Y2 - Turn brooch - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION This invention relates to a turn broach suitable for machining a journal of a crankshaft, etc.
It relates to improvement of a segment mounting structure.

[0002]

2. Description of the Related Art In recent years, as a method of cutting a crankshaft of a reciprocating internal combustion engine, for example, a method of continuously processing using a turn broach as shown in FIGS. 8 and 9 has been widely adopted. In the turn broach shown in these figures, a plurality of arc-shaped segments 4 are mounted on the outer peripheral portion of the rotating shaft S of the processing machine 2 along the circumferential direction of the rotating shaft S. A plurality of cutting blade tips 6 are fixedly seated. In the turn broach illustrated in FIG. 8, the cutting portions 8 including a plurality of segments 4 arranged in the circumferential direction are provided in five rows along the axial direction of the rotation shaft S. It is sufficient if there is at least one, and it is variously changed according to the workpiece.

The turn broach is provided in such a manner that the axis of the work W attached to the chuck 10 and the axis of the rotary shaft S are parallel to each other. 9 arrow A direction)
At a high speed, and rotating the rotation axis S at a very low speed in a specific direction (the direction of the arrow B in FIG. 9).
The side cutting of the counter weight C, the width cutting of the journal J, and the diameter machining of the journal J are continuously performed.

[0004] In the above-described turn broach, the mounting structure of each segment with respect to the rotation axis S is conventionally known as shown in FIG.
0 to 12 as shown in FIG. That is, each segment 4 having a substantially sector shape in a side view has an inner diameter portion 12.
Are formed in an arc shape, and are in contact with the outer peripheral portion of the rotating shaft S without any gap. The key groove 14 extending in an arc shape in a side view is formed on each of the inner diameter portion 12 and the outer peripheral portion of the rotating shaft S. 15 are formed, and key grooves 17, 18 extending linearly are formed.

A vertical key 16 extending in an arc shape in a side view mounted on the key groove 15 and a horizontal key 20 extending in a straight line mounted on the key groove 18 correspond to the key groove 14 and the key groove of the segment 4. 17, the segment 4 is positioned with respect to the rotation axis S. Thereafter, in this state, the positional relationship between the two is fixed by a plurality of (in this case, four) bolts 22.

[0006]

By the way, in the conventional turn broach as described above, the weight of each segment 4 is heavy, the attachment and detachment of the segment 4 is heavy, and the vertical key 18 is curved. However, there is a problem that the mounting of the segment 4 using the vertical key 18 is troublesome and time-consuming, and the working efficiency is poor. An object of the present invention is to solve the above problems.

[0007]

According to the present invention, a plurality of segments extending in an arc shape are mounted on an outer peripheral portion of a rotating shaft driven to rotate around an axis along a circumferential direction of the rotating shaft. In a turn broach in which a plurality of cutting blade tips are fixedly held along the circumferential direction of the segment on the outer peripheral portion of each segment, the respective inner segments are mounted on the outer peripheral portion of the rotary shaft, A linearly extending inner segment member, and an outer segment member having an inner peripheral portion extending linearly and a plurality of cutting blade tips fixedly held at an outer peripheral portion, and a straight line at the outer peripheral portion of the inner segment member. A key is formed in such a manner that a wide portion and a narrow portion are alternately formed along the longitudinal direction and the wide portion and the narrow portion are smoothly connected to each other so as to be mounted in the key groove. Provided,
On the inner peripheral portion of the outer segment member, extends linearly,
The wide portions and the narrow portions are alternately located along the longitudinal direction, and the wide portions and the narrow portions are smoothly connected to each other, and the narrow portions are the wide portions of the key at the fixing position of the outer segment member. And key grooves are formed to fit each other without any gap.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. The turn broach shown in this embodiment has a segment mounting structure (including a segment structure).
The other features are the same as those shown in FIGS. 8 and 9 described above.

In these figures, reference numeral 32 denotes an inner segment member, and reference numeral 34 denotes an outer segment member. These two members constitute a segment 30 (see FIG. 3). As a whole, the segment 4 shown in FIG. Both members are connected so as to form a fan shape similar to.

The inner segment member 32 includes an inner peripheral portion 36.
Are formed in an arc shape that is attached to the outer peripheral portion of the rotating shaft S without any gap, and extend along the circumferential direction of the rotating shaft S. The inner peripheral part 3
6, a key groove 38 is formed along the circumferential direction, and a key groove 40 is also formed along the circumferential direction at the outer peripheral portion of the rotating shaft S facing the key groove 38.
A vertical key 42 extending in an arc shape is fitted between the first and second keys (FIG. 3).

A key groove 44 extending linearly along the axial direction of the rotating shaft S is formed at the side center of the inner peripheral portion 36 of the inner segment member 32, and a rotating groove opposing the key groove 44 is formed. A key groove 46 is also formed on the outer peripheral portion of the shaft S, and between the key grooves 44 and 46, the horizontal key 4 extending linearly is formed.
8 is inserted.

Further, four bolt holes 50 are formed in the vicinity of the square of the inner segment member 32, and the distal end thread portions of the bolts (not shown) inserted into each of the bolt holes 50 are formed on the rotation shaft S. The inner segment member 32 and the rotation shaft S are fixed to each other by being screwed to the outer peripheral portion.

The outer peripheral portion 52 of the inner segment member 32 is formed in a flat surface extending linearly in a side view, and has a key groove extending linearly in the center in the width direction (axial direction of the rotation axis S). 54 are formed. At one end of the key groove 54, a key groove 56 extending linearly along the axial direction of the rotation axis S orthogonal to the key groove 54 is formed. In the key groove 56, a horizontal key extending linearly is formed. 58 is inserted and fixed to the inner segment member 32 by bolts 59.

A vertical key 60 is provided in the key groove 54.
Is inserted with one end thereof in contact with the side surface of the horizontal key 58. The horizontal key 58 is formed such that wide portions 60a and narrow portions 60b are alternately formed along the longitudinal direction, and the wide portions 60a and the narrow portions 60b are smoothly connected to each other. 60 a is fitted in the key groove 54 in a state of being fitted to the side wall of the key groove 54, and is fixed to the inner segment member 32 by a bolt 62. In addition, a screw hole 64 that opens outward is formed in the outer peripheral portion of the inner segment member 32.

The inner peripheral portion 66 of the outer segment member 34
Extend in a straight line in a side view, and
The key groove 68 is formed at a position opposed to the vertical key 60 when the vertical key 60 is mounted in a flat surface shape that abuts the outer peripheral portion 52 of the second key 52 without any gap. The key groove 68 has a wide portion 68a and a narrow portion 6a along its longitudinal direction.
8b are alternately located, and the wide portions 68a and the narrow portions 68b are smoothly connected (FIG. 5). The width h1 of each narrow portion 68b is determined by the wide portion 60a of the vertical key 60. Is formed substantially equal to the width h2 of

At one end of the inner peripheral portion 66, an engaging portion 70 having an L shape in a side view is formed linearly along a direction orthogonal to the key groove 68. Further, four daruma holes 72 are formed in the inner peripheral portion of the outer segment member 34 along a substantially radial direction of the outer segment member 34.

The outer peripheral portion of the outer segment member 34 is formed to have a width smaller than that of the inner peripheral portion, and a plurality of cutting tips 74 are fastened and fixed to both side surfaces by bolts 76. Each of these cutting blade tips 74 is formed by forming a hard material such as a cemented carbide into a substantially rectangular flat plate in appearance.

A plurality of (in this case, three) holes 78 extending in the width direction are formed on the side of the center of the outer segment member 34 along the circumferential direction.

In the turn broach according to the above configuration,
When the segment 30 is mounted on the outer periphery of the rotation shaft S, the inner segment member 32 is moved to the rotation shaft S using the vertical key 42 and the horizontal key 48 in the same manner as in a conventional turn broach.
The outer segment member 32 is fixed to the rotation shaft S by tightening a bolt (not shown) inserted into the bolt hole 50.

Next, as shown in FIGS. 1 to 3, a vertical key 60 and a horizontal key 5 are provided on the outer peripheral portion of the inner segment member 32.
8 is mounted and fixed, and a screw portion on the distal end side of the clamp bolt 78 (FIG. 3) is screwed into the screw hole 64 by a predetermined amount.
Thereafter, when the outer segment member 34 is attached to the outer peripheral portion of the inner segment member 32 such that the key groove 68 thereof is approximately aligned with the vertical key 60, each wide portion 60a of the vertical key 60 becomes a wide portion 68a of the key groove 68. The outer segment member 34 is easily inserted into the vertical key 60 (FIG. 6).
State).

In this state, the outer segment member 34
Is slid toward the horizontal key 58 along the longitudinal direction of the vertical key 60, the engaging portion 70 contacts the horizontal key 58, and the wide portion 60 a of the vertical key 60 And the outer segment member 34 is completely positioned with respect to the inner segment member 32 (the state of FIG. 7). As the outer segment member 34 slides, each clamp bolt 78 moves to the small hole 72b of the dharma 72,
In this state, the outer segment member 34 is completely fixed to the inner segment member 32 by tightening the clamp bolt 78.

According to the above-described turn broach, when changing or replacing the segment 30, the inner segment 32
Once installed on the rotating shaft S, there is no need to remove it,
Only the outer segment 34 can be replaced or changed. Since the outer segment 34 is smaller in size and smaller in weight than the inner segment 32, the working weight can be remarkably reduced as compared with the case where the conventional segment shown in FIGS. 10 to 12 is used.

When the outer segment member 34 is mounted on the inner segment 32, the key groove 68 of the outer segment member 34 can be easily inserted into the vertical key 60,
In addition, by simply sliding along the longitudinal direction, positioning can be performed easily and quickly, and the labor and labor required for straight-off work of the segment can be greatly reduced as compared with the case where a conventional segment is used, and work can be performed. The time can be significantly reduced, and the working efficiency can be improved.

Further, by utilizing the holes 78 of the outer segment member 34, the operator can easily carry the outer segment member 34.

The above effect becomes more remarkable as the number of segments mounted on the rotating shaft S increases.

[0026]

As described above, in the turn broach according to the present invention, each segment has an inner segment mounted on the outer periphery of the rotating shaft and an outer segment extending linearly. Since the inner peripheral portion extends linearly and the outer peripheral portion has an outer segment member in which a plurality of cutting tips are fixedly held, the outer segment member is replaced when the segment is changed or exchanged. And the working weight can be reduced as compared with the conventional case.

Moreover, a linearly extending key groove is formed in the outer peripheral portion of the inner segment member, and the key groove can be mounted in this key groove.
A wide portion and a narrow portion are alternately formed along the longitudinal direction, and a key is provided in which the wide portion and the narrow portion are smoothly connected to each other. The wide portions and the narrow portions are alternately positioned along the direction, and the wide portions and the narrow portions are smoothly connected to each other, and the narrow portions have no gap with the wide portion of the key at the fixing position of the outer segment member. Since the key groove to be fitted is formed, when the outer segment member is mounted on the inner segment member, in a state where the key is mounted on the inner segment member, the key groove of the outer segment member is formed on the inner segment member. By roughly matching the key exposed from the key groove, the wide portion of the key loosely fits into the wide portion of the key groove of the outer segment member, and the outer segment member is easily inserted into the key.

Then, if the outer segment member is slid along the longitudinal direction of the key in this state, the wide portion of the key and the reduced width portion of the key groove are fitted, and the outer segment member is engaged with the inner segment member. Are easily positioned. Therefore,
The labor and labor required for mounting the segments can be greatly reduced, and the working time can be significantly reduced.
Work efficiency can be improved.

[Brief description of the drawings]

FIG. 1 is an arrow view from the direction of arrow I in FIG. 2;

FIG. 2 is a side view of the turn broach according to the embodiment of the present invention, showing a state where the outer segment member is not mounted.

FIG. 3 is a view as seen from the direction of arrow III in FIG. 2;

FIG. 4 is a side view showing the outer segment member of the turn broach according to the embodiment of the present invention.

FIG. 5 is a view as seen from the direction of arrow V in FIG. 4;

FIG. 6 is a view showing the mounting operation of the key and the key groove of the outer segment member.

FIG. 7 is a view showing the mounting operation of the key and the key groove of the outer segment member.

FIG. 8 is a perspective view showing a general processing method using a turn broach.

FIG. 9 is a schematic side view of the turn broach of FIG. 8;

FIG. 10 is a side view of a conventional turn broach.

FIG. 11 is a view as seen from the direction of arrows VII in FIG. 10;

FIG. 12 is a view as seen from the direction of arrows VIII in FIG. 10;

[Explanation of symbols]

 S Rotating axis 30 segment 32 Inner segment member 34 Outer segment member 54 Key groove (Inner segment member) 60 Key 60a Wide portion 60b Reduced width portion 68 Key groove (Outer segment member) 68a Wide portion 68b Reduced width portion 74 Cutting edge tip

Continuing on the front page (72) Inventor Yoichi Akashi 1511 Furamagi, Ishishita-cho, Yuki-gun, Ibaraki Pref. Tsukuba Works, Mitsubishi Materials Corporation (56) References JP-A-2-145207 (JP, A)

Claims (1)

(57) [Scope of request for utility model registration] 1. A plurality of segments extending in an arc shape are mounted on an outer peripheral portion of a rotating shaft driven to rotate around an axis along a circumferential direction of the rotating shaft. In the turn broach in which the cutting edge tip is fixedly held along the circumferential direction of the segment, the inner segment member is attached to the outer peripheral portion of the rotating shaft, and the outer peripheral portion extends linearly. And an outer segment member having an inner peripheral portion extending linearly and a plurality of cutting edge tips fixedly held on the outer peripheral portion, and a key groove extending linearly is formed on the outer peripheral portion of the inner segment member. A wide portion and a narrow portion are alternately formed along the longitudinal direction so as to be mountable in the key groove, and a key is provided in which the wide portion and the narrow portion are smoothly connected to each other. Straight on the inner circumference The wide portions and the narrow portions are alternately located along the longitudinal direction, and the wide portions and the narrow portions are smoothly connected to each other, and the narrow portions are fixed to the outer segment member. A turn broach characterized by forming a key groove that fits into a wide portion without any gap.