JPH0222168Y2 - - Google Patents

Description

[Detailed Description of the Invention] Technical Field The present invention relates to a cutting device for cutting holes with irregular cross-sections.

Prior Art When forming irregular cross-sectional holes whose diameter changes in the depth direction, such as tapered holes, various holes whose inner wall surface is not cylindrical, etc., the workpiece is drilled using a drilling machine or the like. After forming a straight pilot hole in the hole, use a boring quill or recessing tool large enough to be inserted into the opening of the hole, and use a device such as copy boring to expand the inner wall surface of the pilot hole into the desired shape. It was open.

Problems to be Solved by the Invention However, according to such conventional devices, holes must be machined in multiple steps using multiple tools and their drive devices, making it troublesome to form holes with irregular cross-sections. Ta.

Means to Solve the Problems The present invention was made against the background of the above circumstances, and its gist is (1) a first shaft that is rotated by a drive shaft and sent in the axial direction;
(2) an eccentric hole that opens at the distal end of the first shaft and is formed eccentrically with respect to the axis of the first shaft; and (3) a cutting blade is provided at the distal end, while a longitudinal a second shaft having an elongated hole penetrating in a direction perpendicular to the direction and extending in the longitudinal direction of the second shaft, the base end of which is fitted into the eccentric hole so as to be immovable in the axial direction and relatively rotatable about the axis; , (4) formed on the first axis;
(5) a guide groove that passes through the first shaft in a direction perpendicular to the longitudinal direction of the first shaft and extends in the longitudinal direction of the first shaft; (6) a pin that is provided to prevent relative rotation between the first shaft and the second shaft; a pin supporting device that inaccessibly supports both ends of the pin, and at least one of the elongated hole formed in the second shaft and the guide groove formed in the first shaft extends in the penetrating direction. The reason is that the rotational phase is changed in the longitudinal direction.

Function and Effect of the Invention By doing this, when the first shaft is sent in the axial direction by the drive shaft, the second shaft is fitted with the first shaft so as not to be movable in the axial direction and relative rotation is prevented by the pin. The cutting blade of the shaft begins cutting the workpiece. When the first and second axes advance in the axial direction as the workpiece is being cut, the pins, which are supported inaccessibly to the workpiece by the pin support device, move along the first and second axes. relative movement in the axial direction. an elongated hole formed in the second shaft and the first
At least one of the guide grooves formed on the shaft is formed such that the rotational phase in its penetrating direction changes as the pin moves in the axial direction of the first shaft. rotates relative to the first axis. Since the second axis is eccentric with respect to the first axis, the cutting blade rotation locus of the cutting blade with respect to the first axis is changed in the rotational radial direction as the first axis moves forward. Therefore, in one process of rotating the first shaft using the drive shaft and feeding it in the axial direction, holes with irregular cross sections are formed all at once.

Embodiment Hereinafter, an embodiment of the present invention will be described in detail based on the drawings.

In FIG. 1, reference numeral 10 denotes a first shaft having a tapered connecting portion 12 that is connected to the rotating main shaft of the machine tool, and an eccentric hole 14 that opens in the end surface is provided at the end opposite to the connecting portion 12. The formed cylindrical part 16
is provided. The axis of the eccentric hole 14 is the first axis 1
It is parallel to the rotation axis of 0, and is offset by a small distance δ with respect to it. Said cylindrical part 1
6 includes a pair of guide grooves 1 that penetrate in a direction perpendicular to the rotational axis and whose relative phase with respect to the first shaft 10 in the penetrating direction changes as it goes toward the uniaxial center.
8 and 19 are formed. That is, as shown in FIG. 2, the guide grooves 18 and 19 are formed in a spiral shape with a constant lead angle on the outer circumferential surface of the first shaft 10, and are each provided over half the circumference of the outer circumferential surface. .

A second shaft 20 serving as a cutting tool is fitted into the eccentric hole 14 formed in the first shaft 10. As shown in FIG. 3, the second shaft 20 includes a base 22 that is fitted into the eccentric hole 14 so as to be relatively rotatable, and a throwaway serving as a cutting blade that protrudes from the eccentric hole 14 and is fixed by a clamp fitting 24. A cutting portion 28 having a tip 26 is provided. The base 22 has an elongated hole 30 that passes through the base 22 in a direction perpendicular to its axial direction and extends in its longitudinal direction.
is formed. In addition, the base 22 of the second shaft 20
An annular groove 32 is formed between the inner peripheral surface of the eccentric hole 14 and the annular groove 32, and a ball 36 is inserted into the space between the annular groove 34 formed on the inner peripheral surface of the eccentric hole 14 and the annular groove 32. Two shafts 20 are attached to the first shaft 10 so as to be rotatable relative to the first shaft 10 but not movable in the axial direction.

Returning to FIG. 1, the pin 38 is passed through the elongated hole 30 and the guide grooves 18, 19, thereby preventing the second shaft 20 from rotating relative to the first shaft 10. During cutting, both ends of the shaft 38 are supported by a pin support device so as to be rotatable around the first shaft 10 and inaccessible to the workpiece 40. That is, the cylindrical fixing member 42 is fixed by coming into contact with the workpiece 40.
The fixed member 4 is sandwiched between the thrust bearing 44.
An outer case 46 having a larger diameter than 2 is attached so as to be relatively rotatable. Note that a retaining ring 47 is fitted onto the inner peripheral surface of the outer case 46 to prevent the fixing member 42 from falling off from the outer case 46.
An inner case 48 having a smaller diameter than the outer case 46
The inner case 48 is disposed within the outer case 46 by screwing together a male thread formed on the outer circumferential surface of the outer case 46 and a female thread formed on the inner circumferential surface of the outer case 46 . A through hole 50 is formed in the inner case 48 in a direction perpendicular to its axis, and both ends of the pin 38 are fitted into the through hole 50.

Therefore, when the connecting portion 12 of the first shaft 10 is attached to the rotating main shaft of the machine tool and the fixed portion 42 does not contact the final workpiece 40, the inner case 48, the outer case 46, and the fixed member 42 is suspended by the first shaft 10 via the pin 38. When the workpiece 40 contacts the fixing part 42, the pin 38 is suspended by the inner case 48, the outer case 46, and the fixing member 42. is the first axis 1
0 and is supported inaccessible to the workpiece 40 in a rotatable state.

The operation of this embodiment will be explained below.

As the first shaft 10 is rotationally driven by a rotating main shaft (not shown) and sent toward the workpiece 40, the lower end surface of the fixed member 42 is rotated toward the workpiece 40.
0 and are brought into a non-rotating state, and further movement of the outer case 46, inner case 48, and pin 38 is prevented. FIG. 1 shows this state.

Therefore, from now on, the first shaft 10 and the second shaft 20
The throw-away tip 26 attached to the cutting part 28 of the second shaft 20
starts cutting the workpiece 40. In this state, the pin 38 whose both ends are supported by the inner case 48 is moved relative to the first shaft 10 and the second shaft 20 in the axial direction (upward in FIG. 1), so that the guide grooves 18, 19 You will be guided along the As mentioned above, since the guide grooves 18 and 19 are formed in a spiral shape, the pin 38 and the second pin 38 penetrated by the guide grooves 18 and 19 are spirally formed.
As the cutting depth of the throw-away tip 26 increases, the shaft 20 is gradually rotated relative to the first shaft. As a result, the rotation locus diameter of the cutting edge of the throw-away tip 26 increases as the feed amount of the second shaft 20 increases, and the workpiece 4
0 is formed with an irregularly shaped hole 52 shown in FIG.

As described above, according to the irregular-shaped hole cutting device of this embodiment, the irregular-shaped hole 52 can be easily cut by a single process of rotating and feeding the workpiece 40 in the axial direction while being rotationally driven by the rotating main shaft. It is formed. Therefore, after forming a straight pilot hole in the workpiece using a drill using a drilling machine or the like,
Using a boring quill or recessing tool that is large enough to be inserted into the opening of this hole, a device such as copy boring is used to widen the inner wall surface of the prepared hole into the desired shape, thereby forming an irregularly shaped hole. Compared to the conventional method, the process is simpler and the efficiency of hole drilling work is higher, and only one type of machine, such as a drill press, that has a rotary spindle capable of feeding is required.

Next, another embodiment of the present invention will be described. In addition,
In the following description, parts that are common to the above-mentioned embodiments are designated by the same reference numerals, and the description thereof will be omitted.

The aforementioned fixed member 42 is made non-rotatable and immovable in the axial direction by being brought into contact with the workpiece 40, but as in the irregular hole cutting device shown in FIG. It may be supported non-rotatably and immovably in the axial direction by a fixedly provided bushing plate 60. That is, in the circular hole 62 formed in the bushing plate 60, there is a bushing 64 which is tightly fitted to the lower part of the fixing member 42.
is fitted, and the fixing member 42 is supported by the bush plate 60 via the bush 64. According to this embodiment, in addition to obtaining the same effects as in the above-described embodiments, the contact between the fixing member 42 and the workpiece 40 is eliminated, so that the workpiece 40 is not damaged. This has the advantage that the fixing member 42 is prevented from being worn out.

One embodiment of the present invention has been described above, but
The present invention can also be applied in other aspects.

For example, the guide groove 18 formed on the first shaft 10 can be changed not only into a spiral shape but also into an arc shape depending on the intended shape of the irregular cross-sectional hole. guide groove 18,
If the hole 19 is made into an arc shape, a hole with an irregular cross section of a drum shape or a drum shape can be obtained.

Further, the guide grooves 18 and 19 are formed in a straight line parallel to the axis of the first shaft 10, while the elongated hole 3
Even if the hole is formed so that the rotational phase with respect to the second shaft 20 changes as the direction of penetration of the zero points toward the uniaxial center, a hole having the same shape as the hole 52 having the irregular cross section described above can be formed.

Further, in the above-described embodiments, the shape of the cutting edge provided on the cutting portion 28 of the second shaft 20 may be variously changed as necessary.

Further, the first shaft 10 can be used by being attached not only to the main shaft of a machine tool but also to the rotating shaft of a handball (portable electric ball). In this way, not only metal processing but also concrete filling holes and the like can be efficiently formed in residential wall materials.

Further, although the connecting portion 12 of the first shaft 10 is formed in a tapered shape, it may be formed in a straight shape or a flange shape depending on the connecting device of the rotating main shaft to which it is attached.

The above-mentioned embodiment is merely an embodiment of the present invention, and various modifications may be made to the present invention without departing from the spirit thereof.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway front view illustrating an embodiment of the present invention. 2 is a front view showing the first axis in FIG. 1. FIG. FIG. 3 is a front view showing the second axis in FIG. 1. FIG. 4 is a sectional view showing an example of a hole having an irregular cross section formed in accordance with the example of FIG. 1. FIG. 5 is a diagram corresponding to FIG. 1 showing another embodiment of the present invention. 10: 1st shaft, 14: Eccentric hole, 18, 19: Guide groove, 20: 2nd shaft, 26: Throwaway tip (cutting blade), 30: Long hole, 38: Pin, 4
2: Fixed member, 46: Outer case, 48: Inner case 48 (pin support device).

Claims (1)

[Scope of Claim for Utility Model Registration] An irregular cross-section hole cutting device that cuts a hole with an irregular cross section in a workpiece by being rotated and fed in the axial direction, the device being rotated by a drive shaft and fed in the axial direction. a first shaft that is opened at the distal end surface of the first shaft and formed eccentrically with respect to the axis of the first shaft; a second shaft having an elongated hole penetrating in a direction perpendicular to the direction and extending in the longitudinal direction, the base end being fitted into the eccentric hole so as to be immovable in the axial direction and relatively rotatable about the axis; , a guide groove formed on the first shaft, penetrating in a direction orthogonal to the longitudinal direction of the first shaft, and extending in the longitudinal direction of the first shaft; a pin that is provided through the elongated hole and prevents relative rotation between the first axis and the second axis; and a pin that is rotatable about the axis of the first axis of the pin and that is connected to the workpiece during cutting. a pin support device that supports both ends of the pin inaccessible to the member, and rotation in the penetrating direction of at least one of the elongated hole formed in the second shaft and the guide groove formed in the first shaft; 1. A cutting device for cutting a hole with an irregular cross section, characterized in that the phase is formed so as to change in the direction of one axis.