JPH0224601Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] This invention relates to a unit in which a cutting tool is mounted at an angle with respect to a spindle.

[Conventional technology and its problems]

This type of unit is, for example,
1, 2, and 5, a unit case 1 rotatably supports a shank 2 that passes through the case 1. A connecting portion 4 with the spindle 3 is formed at one protruding end of the
The other protruding end is formed with a chuck portion 6 to which the cutting tool 5 is attached at an angle to the shank 2, and a pin holding stand 7 is provided protruding from the unit case 1, and this pin holding stand 7 is provided with the following features: A unit case fixing pin 9 that can be locked to the end face of the frame 8 around the spindle 3 is inserted in a movable manner, and a stopper 11 for preventing shank rotation that can be locked to a locking part 10 that is integrated with the shank 2 is attached to the shank 2. Locking part 10
The structure is such that it can be moved forward and backward.

To attach this unit to the frame 8 and spindle 3, fit the connecting part 4 into the spindle 3, and lock the unit case fixing pin 9 to the end face of the frame 8 to fix the unit case 1 and lock the stopper 11. The unit case 1 is fixed to the frame 8 and the shank 2 is made rotatable relative to the unit case 1. When the spindle 3 is turned, the cutting tool 5 is rotated through the shank 2 etc. to perform cutting. It is done.

By the way, in recent years, the unit case 1 has been divided into a part on which the pin holding base 7 is protruded and a part on the side of the chuck part 6, and the former part is made rotatable and fixed at a desired position about the shank 2. A unit case has been devised in which the positional relationship of the cutting tool 5 with respect to the pin holding base 7 can be changed (see FIG. 2).
This has the advantage that the cutting angle of the cutting tool 5 with the shank 2 as the axis can be changed and the working range can be widened.

This rotatable/fixable conventional structure
As shown in the figure and FIG. 6, the pin holding stand side unit case part (hereinafter referred to as one part) 1a and the chuck part side unit case part (hereinafter referred to as the other part)
1b rotatably held by an annular contact surface, a cut groove 40 extending from the inner surface (contact surface) to the outer surface is formed in the holding annular portion, and a bolt 41 is inserted between the grooves 40.
By tightening the member 1b, the inner diameter is reduced to form the member 1b.
It is fixed by pressure contact.

In this way, when the diameter is reduced and the pressure welding is fixed, this pressure force is applied to the bearing 15 between the unit case 1 and the shank 2.
When the compressive force is repeated, a preliminary load is applied to the bearing 15, etc., and the bearing 15 etc. are likely to deteriorate and cause looseness, and the unit case is the same with respect to the rotation of the shank 2. A problem arises in which the core becomes loose (no longer fixed) and the cutting action is disturbed.

[Purpose of invention]

This invention takes the above points into consideration and aims to provide a rotating and fixing means that does not apply a preliminary load to the bearing.

[Means to achieve the purpose]

In order to achieve the above object, in this invention, in the above-mentioned cutting tool mounting unit, the unit case has a circular surface coaxial with the shank, and the portion where the pin holding base protrudes and the chuck portion are connected to each other. The chuck side unit case part can be rotated about the shank with respect to the pin holding stand side unit case part, and one of the both unit case parts on the dividing surface is attached to the side part. On the other hand, an inverted T-shaped annular groove is formed centering on the shank, a required number of nuts are inserted into the inner part of the annular groove, and each nut is inserted through the other side of the unit case portion, and the nut is inserted into the annular groove. The structure was such that the bolt was inserted into the groove and screwed into place.

[Effect]

To create a unit constructed in this way, first loosen the bolts and nuts, rotate the chuck-side unit case part to the required position relative to the pin holding stand side unit case part, set the cutting tool at the required cutting angle, and then set the cutting tool at the required cutting angle. Tighten the bolts and nuts to secure both parts.

After this, as in the conventional case, fit the connecting part into the spindle, lock the unit case fixing pin to the end face of the frame, release the collar from the locking part, fix the unit case to the frame, and attach it to the unit case. The shank is made rotatable and attached to a spindle and frame, and the spindle is rotated to perform cutting.

〔Example〕

Hereinafter, embodiments of this invention will be described based on the accompanying drawings.

As shown in FIGS. 1 and 2, in this embodiment, as in the conventional case, a shank 2 penetrating through the unit case 1 is rotatably supported, and one protruding end of the shank 2 is supported in a unit case 1. A truncated conical connection part 4 with a spindle 3 of a machine tool is formed at one end, and a chuck part 6 is formed at the other protruding end. This chuck portion 6 is rotatably provided in the case 1 with the shank 13 of the chuck 12 positioned at right angles to the shank 2, and both shank 2 and 13 are connected via a bevel gear 14.
When the shank 2 rotates, the chuck 12 rotates via the bevel gear 14 and the shank 13, and the chuck 1
A cutting tool 5 attached to the shank 2 rotates while being inclined at right angles to the shank 2.

The unit case 1 is divided into two parts on a plane perpendicular to the shank 2 near the central connection part 4, and one part (on the connection part 4 side) is part 1a, while the other part (on the chuck part 6 side) is divided into two parts.
The portion 1b is rotatable about the shank 2 through a bearing 15. An annular groove 16 having an inverted T-shaped cross section is formed in the dividing surface of the other portion 1b, and a through hole 17' opening into the inner surface of the case is formed at one point around the groove 16. By inserting the nut 17 into the groove 16 through the through hole 17' and screwing the bolt 18 inserted into the groove 16 from one part 1a into the nut 17, both parts 1a and 1b are attracted to each other. Tighten and secure. A required number of bolts 18, for example four, are provided at equal intervals around the groove 16. Loosen the bolts and nuts 18, 17 and rotate one part 1a to the other part 1b to the desired position, and then tighten the bolts at that position. When tightened, both 1a and 1b are integrated. In addition, a scale is formed in the circumferential direction on the outer periphery of one of the unit case parts with the dividing surface as the boundary,
A reference line is formed on the other part, and the required number of times position, that is, the cutting angle of the cutting tool 5 is set by comparing the scale with the reference line.

A pin holder 7 is bolted to protrude from one of the unit case portions 1a, and a hollow pin 9 for fixing the unit case 1, which is movable toward the end surface around the spindle 3, is attached to the pin holder 7. The tip of the pin 9 that is inserted into the frame 8 is biased in the protruding direction by a spring 19. The tip of the pin 9 is formed into a tapered shape. , pin 9
The unit case 1 is fixed to the frame 8 via. A supply oil passage 21 in the frame 8 opens in the locking hole 20, and when the pin 9 is fitted into the locking hole 20 and cutting oil is sent into the oil passage 21 from a cutting oil supply source (not shown). , the cutting oil flows into the locking hole 20
It reaches inside pin 9 through.

A stopper 11 for preventing two rotations of the shank is slidably fitted into the unit case fixing pin 9, and the protruding piece 11a of the stopper 11 is fitted into a locking part 10 formed on the outer surface of the shank. The shank 2 is fixed to, for example,
To prevent undesired rotation of the shank 2 during automatic replacement of this unit in a machining center. A guide pin 22 protruding from the pin holding base 7 slidably passes through the protruding piece 11a and attaches to the stopper 11.
At the same time, the stopper 11 is constantly biased by the spring 24 via the pin 23 protruding from the pin holder 7 as shown by the chain line in FIG. The unit case fixing pin 9 is inserted into the locking hole 20.
When the stopper 11 is inserted into the frame 8, the stopper 11 comes into contact with the end surface of the frame 8 and is pushed as shown by the solid line in the figure, and the protruding piece 11a
is retreated and separated from the locking portion 10, and the shank 2 becomes rotatable with respect to the unit case 1.

An annular contact surface 26 is formed on the outer circumferential surface of the other unit case portion 1b, and the annular contact surface 26 is centered around the shank 2 into which the ring 25 fixed to the pin holding base 7 is slidably fitted. 26 is formed with an annular groove 27 coaxial with the surface thereof. As shown in FIGS. 1 and 4, the ring 25 has a recess 25a formed at one location around its periphery, and by fitting the protrusion of the pin holding base 7 into this recess 25a via an oil seal, the ring 25 is removed. is integrated with the pin holding base 7. An oil passage 28 leading to the hollow part of the pin 9 is guided to the protrusion of the pin holding base 7, and this oil passage 28 passes through the through hole 28a of the recess 25a to the groove 2.
Even if the unit case portion 1b rotates with respect to the ring 25, the cutting oil in the pin 9 will flow into the oil channel 2.
8 and is guided into the groove 27 via the through hole 28a.

In addition, on the surface of the other unit case portion 1b facing the chuck 12, as shown in FIGS. 1 and 3, there are three spout ports 29 facing the cutting tool 5 at equal intervals around the cutting tool 5. Each spout 29 is connected to the groove 27 through an oil pipe 30, and the cutting oil in the groove 27 is jetted from the spout 29 to the cutting tool 5 through the oil pipe 30.

The embodiment is configured as described above, and its operation will be explained next.

To carry out the cutting action with this embodiment, first loosen the bolts 18 and nuts 17, rotate the chuck side unit case part 1b to the required position with respect to the pin holding stand side unit case part 1a, and then move the cutting tool 5. is the required cutting angle, and at that position bolt 1 is
8. Tighten the nut 17 to fix both parts 1a and 1b. This tightening is due to mutual attraction, so
No force is applied to the bearing 15, and it can be firmly fixed.

After that, as in the conventional case, the connecting part 4 is fitted into the spindle 3, the unit case fixing pin 9 is fitted and locked into the locking hole 20 on the end face of the frame 8, and the stopper 11 is released from the locking part 10. The unit is mounted on the spindle 3 and frame 8 by fixing the frame 8 to the unit case 1 and making the shank 2 rotatable relative to the unit case 1. When the spindle 3 is rotated in this state, the cutting tool 5 rotates via the shank 2, bevel gear 14, shank 13, and chuck 12 to perform cutting. During this cutting, cutting oil is ejected from the supply oil passage 21 of the frame 8, through the hollow portion of the pin 9, the annular groove 27, etc., and from the spout 29 to the cutting tool 5, thereby achieving a smooth cutting action.

In the above embodiment, the dividing surface of the unit case 1 is a vertical surface of the shank 2, but the dividing surface is a cylindrical surface with the same axis as the shank, and it is possible to rotate and fix on this surface with the same structure as described above. Good too. In this case, the tightening force is in the pressing direction of the bearing 15 (radial direction of the shank 2), but both parts 1a,
Since the tightening is performed by mutual attraction of the bearings 1b, there is no problem with the bearing 15.

Alternatively, the T-shaped groove 16 may be formed on one side of the unit case portion 1a, and the bolt 18 may be screwed in from the side of the other unit case portion 1b.

[Effect of idea]

This invention is constructed as described above, and the two divided unit case parts are tightened and fixed by mutual attraction, so that there is no problem with the bearings, etc. between the unit case and the shank. There is no. Therefore, even if the cutting angle is changed frequently, a smooth cutting action can be achieved at that angle.

[Brief explanation of drawings]

FIG. 1 is a cutaway front view of essential parts of an embodiment of the cutting tool mounting unit according to this invention, FIG. 2 is a right side view of FIG. 1, FIG. 3 is a bottom view of essential parts of FIG. 1, and FIG. The drawings are a perspective view of the main part of FIG. 1, FIG. 5 is a cutaway front view of the conventional example, and FIG. 6 is a perspective view of the main part of FIG. DESCRIPTION OF SYMBOLS 1...Unit case, 1a, 1b...Divided portion of unit case, 2...Shank, 3...Spindle, 4...Connection part, 5...Cutting tool, 6...
Chuck part, 7...Pin holding base, 8...Frame, 9...Unit case fixing pin, 10...
Shank side locking portion, 11...Stopper for preventing shank rotation, 16...T-shaped groove, 17...Nut, 18...Bolt, 20...Frame side locking hole.

Claims (1)

[Scope of utility model registration request] A shank passing through the case is rotatably supported in the unit case, and one protruding end of the shank forms a connection part with the spindle, and the other protruding end has a cutting tool tilted with respect to the shank. A chuck portion is formed to which the unit case is attached, and a pin holder is provided protruding from the unit case, and a unit case fixing pin capable of being latched to the end face of the frame around the spindle can be moved forward and backward into the pin holder. In the cutting tool mounting unit, in which a stopper for preventing rotation of the shank, which is fitted into the shank and can be engaged with the shank and is integral with the shank, is attached so as to be movable forward and backward relative to the shank, the unit case is placed on the same axis as the shank. The pin holder is divided into a projecting portion and a chuck side portion by a circular surface, and the chuck side unit case portion is rotated about the shank with respect to the pin holder side unit case portion. An inverted T-shaped annular groove is formed in one of both unit case portions on the dividing surface, with the shank as the center, and a required number of nuts are mounted in the deep part of this annular groove. A cutting tool mounting unit characterized in that a bolt is inserted into each nut and is inserted into the annular groove through the other part of the unit case part.