JPH08243812A - Back surface chamfering device for hole drilled from outside plane or quasi-plane to inside curved surface - Google Patents

Abstract

PURPOSE: To provide a device for carrying out back surface chamfering to a hole drilled in the inner peripheral curved surface of the internal space of a work from a flat or nearly flat surface. CONSTITUTION: A head 31 is provided upward from the slant center 32 of a tool holder 30 integrally with the slant center, an inclination regulation pin 15 which penetrates a main body 20 from a shank 10 so as to come in contact with the head 31 when the shark 10 rises relatively to the main body 20, a recess 26 having a slant surface below a position with which the inclination regulation pin 15 of the head 31 comes in contact is formed, and an inclining spring 36 for inclining the tool holder 30 is provided between the main body 20 and the tool holder 30. And when the inclination regulation pin 15 comes in contact with the upper part of the head 31, the tool holder 30 is erected upward and when the shank 10 is arranged coaxially with the hole 51 of a work 50, the cutter 41 of the tool holder erected upward coaxially with the shank 10 enters the hole 51 as it is, and then the shank 10 is lowered relatively to the main body 20 so as to make the inclination regulation pin 15 to engage with the recess 26 of the head 31, the inclining spring 36 inclines the tool holder 30 so as to make the cutter 41 engage with the back surface peripheral edge of the hole 51.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a back chamfering device for a hole formed in a curved inner surface of an internal space from a flat surface or a surface conforming to the flat surface.

[0002]

2. Description of the Related Art In a manifold or the like having a rectangular block provided with a cylindrical vent hole, it is necessary to make a hole in a cylindrical internal space from a flat outer surface, and then subject the hole to a back surface processing. Conventionally, such a back chamfering process has been performed manually, but since the periphery of the hole to be chamfered is a three-dimensional curve, the chamfering process is a troublesome work requiring much labor and time.

[0003]

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to remove a back surface of a hole formed in an inner peripheral curved surface from a substantially flat outer surface. To provide a device for doing so.

[0004]

In order to achieve the above-mentioned object, the means adopted by the present invention are a shank that is attached to a machine tool and is moved up and down in the axial direction and is rotated about the axis, and is integrally rotated with the shank. However, a cylindrical main body held slidably in the axial direction, a compression spring interposed between the shank and the main body to lower the main body, and a tool holder held inside the main body so as to be swingable. In the back chamfering device, the tilt regulating pin for contacting the head of the tool holder and holding the tool holder upright is provided when the shank rises with respect to the main body. And a tilting spring that tilts the tool holder in the direction in which the tool holder contacts the tilt restricting pin when the shank descends with respect to the main body and the tilt restricting pin reaches the recess of the head. Lies in the fact was.

[0005]

First, when the shank is raised with respect to the main body, the inclination regulating pin abuts on the head to erect the tool holder. In this state, insert the tip of the tool holder and the blade into the hole of the work. When the lower surface of the main body comes into contact with the work surface, the blade comes to a position where it can engage with the peripheral edge of the back surface of the hole. Next, when the shank is lowered with respect to the main body, the tilt regulating pin enters the concave portion of the head, and the tilting spring pushes the tool holder to tilt the head in a direction in which the head comes into contact with the tilt regulating pin.
As a result, the blade engages with the peripheral edge of the back surface of the hole, and the back surface of the hole can be ground. The inclination angle of the tool holder when the blade engages with the peripheral edge of the back surface of the hole is large when the engagement position is shallow from the surface and small when the engagement position is deep.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The apparatus of the present invention will be described based on the embodiments shown in the drawings. As shown in FIGS. 1 and 2, a main body 20 is coaxially and vertically slidably fitted into a cylindrical portion 12 of a shank 10 fixed to a mounting portion of a machine tool (not shown). Cylindrical body
A tool holder (30) is coaxially and swingably supported on (20), and a shaft (40) having a blade (41) is fixed to the lower end of the tool holder (30).

A compression spring 11 is provided between the lower surface of the shank cylindrical portion 12 and the upper surface of the flange portion of the main body 20 to press the main body 20 downward. A long hole 21 extending in the axial direction is formed on one side of the upper cylindrical portion 23 of the main body 20, a pin 14 is passed from the shank cylindrical portion 12 to the long hole 21, and the main body 20 is rotated integrally with the shank 10 by the pin 14. , The range of elevation of the shank 10 relative to the body 20 is defined. A long hole 22 for a pin extending in the axial direction is formed on the other side of the upper cylindrical portion 23, and the long hole 22 for a pin is formed from the shank cylindrical portion 12 to the pin.
Pass the tilt control pin 15 through. The tip of the tilt control pin 15 is the main body
It contacts the head 31 of the holder 30 located inside the 20. A recess 26 is formed below the portion of the head 31 where the tilt regulating pin 15 abuts.
To form.

A lower cylindrical portion 24 is coaxially fitted and connected to the lower side of the upper cylindrical portion 23 of the main body 20. Bush 27 at the bottom of the lower cylindrical portion 24
Is mounted coaxially and rotatably via a thrust bearing 28. The bush 27 is supported by a snap ring 42, and the lower surface of the bush 27 projects from the bottom of the lower cylindrical portion 24. The tool holder 30 has a tilt center 32 having a slightly larger diameter below the head 31, and a socket 33 having a larger diameter below the tilt center 32.
The spherical ring 16 is externally fitted to the tilt center 32, and the nut 17 is fitted over the spherical ring 16 to fix the spherical ring 16 to the tilt center 32. The spherical ring 16 is swingably supported by a ring-shaped spherical seat 18 held between an upper cylindrical portion 23 of the main body 20 and a sleeve 25. The sleeve 25 is fixed to the upper cylindrical portion 23 with a bolt 29. The socket 33 of the tool holder 30 is provided with a shaft hole 38 into which the shaft 40 is inserted, and the shaft 40 inserted into the shaft hole is fixed with a set screw.

As shown in FIGS. 1 and 3, the tool holder 30
A flat surface 34 parallel to the axis of the tilt regulating pin 15 is formed on both sides of the socket 33 of the socket 33, and the flat surface 34 is slid on two parallel flat inner surfaces 44 formed in the hollow portion of the sleeve 25 of the main body 20. Insert freely. Flat inner surface 44 of sleeve 25 of body 20 and socket
The tool holder 30 rotates integrally with the main body 20 via the flat surface 34 of 33. The tool holder 30 can be swung or tilted about a spherical ring 16 in a plane parallel to the flat inner surface 44. A radial spring hole 35 whose axial center is parallel to the inclination regulating pin 15 is formed in the lower portion of the upper cylindrical portion 23, and a coiled inclination spring 36 is inserted into the spring hole 35. Snap ring 37 to spring hole 35
Spring seat for mounting the tilting spring 36 in the socket 33.
Abut on 19.

Next, the operation of the apparatus of the present invention will be described. As shown in FIG. 1, first, the holder 30 is coaxially held on the main body 20, and the axis of the main body 20 is aligned with the center of the hole 51 of the workpiece 50 to be machined. At this time, the compression spring 11 pushes down the main body 20 from the shank 10, the tilt regulating pin 15 abuts on the upper part of the head 31, and the tool holder 30 stands upright coaxially with the main body 20. In this state, the shaft 40 and the blade fixed to its tip
41 can be directly inserted vertically into the hole 51 of the work 50. Therefore, lower the shank 10 and the main body 20 together,
The shaft 40 and the cutting tool are inserted into the holes 51 of the work 50, and the lower surface of the bush 27 of the main body 20 is brought into contact with the surface of the work 50. At this time, the blade 41 comes to a position where it can be engaged with the peripheral edge of the back surface of the hole 51.

After the lower surface of the bush 27 comes into contact with the surface of the work 50, the shank 10 is lowered against the compression spring 11 with respect to the main body 20. As shown in FIG. The holder 30 is lowered to a position facing the recess 26 of the head 31. As a result, the tool holder 30 can be tilted, the tool holder 30 in which the spring seat 19 is pressed by the tilting spring 36 tilts around the spherical ring 16, and the blade 41 of the shaft 40 is located at the peripheral edge of the back surface of the machining hole 51. Engage.

The rotation of the shank 10 driven by the machine tool is transmitted to the main body 20 via the pin 14, and the rotation of the main body 20 is transmitted through the flat inner surface of the sleeve 25 of the upper cylindrical portion 23 and the flat surface 34 of the socket 33. Is transmitted to the tool holder 30 and the blade 41
Rotates integrally with the shank 10, and its blade 41 cuts the back surface peripheral edge of the hole 51. Since the bearing 28 is interposed between the bush 27 and the main body 20, the main body 20 rotates, but the bush 27 stands still together with the abutting workpiece 50. During cutting, the inclination angle of the tool holder 30 changes depending on the position of the peripheral edge of the hole back surface with which the blade 41 engages. The inclination angle is small when the engagement position of the blade is deep, and is large when the engagement position is shallow. As a result, the peripheral edge of the back surface of the three-dimensional curve is uniformly chamfered and cut.

When the shank 10 is lifted after finishing the machining, the tilt regulating pin 15 integral with the shank 10 moves up along the slope of the recess 26, and restores the tool holder 30 against the tilt spring 36. When the shank 10 returns to the original upper limit position, the tilt regulating pin 15 contacts the upper part of the head 31, and the tool holder 30 again stands upright coaxially with the main body 20 and escapes from the hole 51, as shown in FIG.

Although not shown, the tool holder may be pivotally attached to the main body by inserting a pin from the main body into the tilt center of the tool holder. In this case, the pin determines the swinging direction of the tool holder and the rotation is transmitted from the main body to the tool holder.Therefore, it is necessary to provide a flat surface parallel to the socket, and a flat inner surface along the hollow part of the tool holder. There is no need to provide it.

[0015]

As described above, the apparatus of the present invention for use in the back chamfering of the hole formed in the inner peripheral curved surface of the internal space from the flat or nearly flat surface is such that the main body is coaxially rotated with the shank and It is installed so that it can be moved up and down, and the tool holder is internally fitted to the body so that it can be tilted.First, the tool holder is coaxially held upright in the body, the tool is passed through the hole drilled in the work, and then the tool holder is tilted. Since it is a method that engages the back edge of the hole with a hole, unlike the conventional method in which the back surface of the hole is chamfered manually, it is easy to form a three-dimensional curve by operating the machine tool. The chamfering can be performed, and the back chamfering work can be performed efficiently and accurately even by an unskilled person, and if necessary, automation can be easily performed.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of an apparatus according to an embodiment of the present invention, showing a state in which a blade is inserted into a machined hole.

2 is an enlarged sectional view taken along line II-II of FIG.

FIG. 3 is an enlarged sectional view taken along line III-III in FIG.

FIG. 4 is a view corresponding to FIG. 1 and shows a state in which a blade is engaged with the peripheral edge of the back surface of the processed hole.

[Explanation of symbols]

10: Shank, 11: Compression spring, 12: Cylindrical part, 14: Pin,
15: Inclined pin, 16: Spherical ring, 17: Lock nut, 1
8: spherical seat, 19: spring seat, 20: body, 21: long hole, 22: long hole for pin, 23: upper cylindrical portion, 24: lower cylindrical portion, 25: sleeve, 26: concave portion, 27: bush, 28: Bearing, 29: Bolt, 30: Tool holder, 31: Head, 32: Tilt center, 33: Socket, 34: Flat surface, 35: Spring hole, 36: Tilt spring, 37: Snap ring, 38: Shaft Hole, 40: shaft, 41: cutlery, 42: snap ring, 43: hollow part,
44: Flat inner surface, 50: Work piece, 51: Hole

Claims (4)

[Claims] 1. A shank (1 which can be attached to a machine tool)
0), a main body (20) that rotates integrally with the shank but is internally fitted from below so as to be slidable in the axial direction, and a compression spring (11) interposed between the shank and the main body to push the main body downward.
A tool holder (30) coaxially arranged in the hollow part (43) of the main body and rotating integrally with the main body, and a shaft (4) with a blade (41) fixed to the lower part of the tool holder (30).
0) and the tilt center (32) of the middle part of the tool holder (30) is tiltably supported by the main body, and when the shank rises with respect to the main body,
The shank is provided with an inclination regulating pin (15) which penetrates the elongated hole (22) for a pin provided in the main body and comes into contact with the head (31) located above the inclination center of the tool holder. A recess 26 is formed below the position where the tilt regulating pin abuts, the tool holder stands upright when the tilt regulating pin abuts the upper part of the head, and the shank descends with respect to the main body. A back chamfering device for a hole formed in an internal curved surface from an outer flat surface or a quasi-flat surface, characterized in that a tilt spring (36) for tilting the tool holder in a direction of contacting the tilt regulating pin is provided in the main body. 2. The tilt center (32) of the tool holder (30)
A spherical ring (16) is externally fitted and fixed to the main body (20), and a spherical seat (18) is provided on the main body (20) to swingably support the spherical ring, and the tool holder is placed at a position below the spherical ring. A socket (33) for fixing the shaft (40) is provided, a flat surface (34) parallel to the tilt regulating pin (15) is formed on both sides of the socket, and the flat surface (34) is formed on both sides of the hollow portion (43) of the main body. The back chamfering device for a hole formed in an inner curved surface from an outer flat surface or a quasi flat surface according to claim 1, characterized in that a flat inner surface (44) extending along the surface is provided. 3. The tilt center (32) of the tool holder (30)
The tool holder is axially attached to the main body by passing a pin from the main body (20) in a diametrical direction.
A back chamfering device for a hole made in the inner curved surface from the described outer plane or quasi-plane. 4. A bush (27) through which a shaft (40) passes is attached to a main body (20) via a bearing (28) so as to be rotatable and project from a lower surface of the main body, and the bush is attached to a work (50). 3. The back chamfering device for a hole formed in an internal curved surface from an external flat surface or a quasi-flat surface according to claim 1, wherein the shank (10) is raised by moving the shank (10) against the outer peripheral surface of the internal surface. .