JPS61131806A - Curved face cutting device - Google Patents

Abstract

PURPOSE:To shorten cutting time by so constituting the captioned device as to be able to accurately cut a curved face only by the axial directional travelling operation of a horizontal boring machine in cutting of the curved face with a large radius by the use of boring arbor of a general purpose horizontal boring machine. CONSTITUTION:A tool holder 25 is set in such a way that the distance from the rotary center of the tool holder to the end of a cutting tool 32 becomes equal to the radius R of the curved face to be cut. And when a boring arbor 1 is rotated with rotation of the hollow shaft 2 of a horizontal boring machine, tool rest bodies 14a and 14b, a tool rest support 15, a tool rest base and gear box 20, and the tool holder 25 are rotated to cut the internal periphery of a workpiece or casing 3. Along with this, the shaft 6 with rack directly coupled with a main spindle 5 is continuously moved to rotate the pinion shaft 10 meshed to the rack 7. Rotation of the shaft 10 rotates the tool holder 25 through a worm shaft and a worm wheel. Therefore, the cutting edge of the cutting tool 32 can cut the R section provided in a hole with a large diameter by means of being mechanically fed.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a curved surface cutting device, and in particular, the present invention relates to a curved surface cutting device that is capable of forming a large diameter hole by using a boring arbor directly connected to a hollow shaft of a general-purpose tank boring machine. The present invention relates to a curved surface cutting device suitable for cutting a curved surface portion (R portion) with a large radius.

[Background of the Invention] When cutting a curved surface using a boring arbor in a machine tool, especially a general-purpose tank boring machine, when cutting a curved surface with a small radius R, a cutting tool formed to the radius R specified in the drawing is used each time. However, when cutting a curved surface with a large radius, it is difficult to use a molded tool, so it is recommended to give the tool a small amount of axial feed and radial feed for cutting. The conventional method was to attach the tool bit by molding a part of the large radius and connect the tools little by little while changing the angle.

In both cases, cutting is done manually in small quantities, making it difficult to cut smooth curved surfaces and being inefficient.

In addition, related devices of this type include
Examples include those described in Publication No. 9-12956.

The invention described in the publication is a curved surface cutting device that cuts a curved surface portion (R portion) with a large radius at the back of a large diameter hole using a face plate attached to a milling shaft of a side boring machine.

That is, a mechanism that converts the movement of the boring spindle in and out into the turning movement of the tool holder, and a bracket that supports the tool holder so that it can turn are installed on the first plate.

The boring spindle moves in and out while rotating the face plate, giving a turning motion to the cutting tool to cut the R part.Uruchino performs continuous boring, R cutting, and facing. No consideration was given to the cutting process used.

[Purpose of the invention]

The present invention has been made in view of the actual state of the prior art described above, and when cutting a curved surface with a large radius using a boring arbor with a machine tool, especially a general-purpose boring machine, the main shaft of the horizontal boring machine is It is an object of the present invention to provide a curved surface cutting device that can accurately process a curved surface section only by directional movement operations and can significantly shorten the processing time.

[Summary of the invention]

The curved surface cutting device according to the present invention includes a hollow-shaft boring arbor directly connected to a hollow shaft around the main axis of a machine tool, and a hollow-shaft boring arbor that is detachably attached to the outside of the boring arbor and rotates with the rotation of the boring arbor. a tool post, an axial feed shaft of the main shaft that is directly connected to the main shaft of the machine tool and is slidably mounted inside the hollow boring arbor, and a linear movement of the axial feed shaft that is connected to the boring arbor. a first conversion mechanism that converts the rotational movement in the axial direction perpendicular to the axis of the turret within the tool rest; a second conversion mechanism for transmitting the transmission; an intermediate shaft connecting the first conversion mechanism and the second conversion mechanism;
It consists of a tool holder formed on the rotating shaft converted by the second conversion mechanism, and a tool attached to this tool holder, and by the axial movement of the main shaft of the working mechanism, The tool holder is configured to rotate the tool holder on the tool rest.

In addition, 1 the present invention has a boring arbor attached to the hollow shaft of a side boring machine, and a pinion shaft built in a part of the boring arbor is attached to the boring arbor by moving the main shaft of the boring machine in the axial direction. A tool rest main body is mounted on the outside of the boring arbor, which houses the conversion mechanism of No. 1, and supports the tool holder so that it can rotate with the rotation of a hollow shaft. A tool holder that can be rotated is connected and attached to a gear device of a second conversion mechanism that converts and outputs input rotation in the right angle direction, and the pinion shaft and gear device built into the boring arbor are connected to the tool post body. Connected through the intermediate shaft.

The distance from the tip of the tool to the center of rotation of the tool holder,
Correctly set the cutting tool in the cutting tool holder so that it is equal to the radius R of the curved surface to be cut, and move the main shaft of the boring machine in and out while rotating the hollow shaft to give the cutting tool a turning motion to cut the curved surface. It is something.

[Embodiments of the invention]

Hereinafter, one embodiment of the present invention will be described with reference to FIGS. 1 to 4.

Here, FIG. 1 is a schematic configuration diagram of a curved surface cutting device according to an embodiment of the present invention, FIG. 2 is a partially sectional side view showing the main part of the device hole in FIG. 1, and FIG. , and FIG. 4 is a side sectional view thereof.

In the figure, 1 is a hollow shaft-shaped boring arbor, 2B is a hollow shaft around the main shaft of the cross boring machine, and the boring arbor 1 is directly connected to the hollow shaft 2, and the casing related to the workpiece shown by the dashed line. It is rotatably held by an arbor support metal 4 attached to the shaft penetrating portion of 3.

5 is the main shaft of the horizontal boring machine; 6 is a shaft with a rack that is directly connected to the main shaft 5 and is related to the axial feed axis of the main shaft, and is equipped with a rack 7; It is slidably attached to the inside via a cylindrical ring 8 provided on its inner peripheral surface.

As shown in FIG. 2, in the rack 7, a pinion portion of a pinion shaft 10 associated with a gear shaft is engaged in a shaft hole 9 provided in a direction perpendicular to the axis of the boring arbor 1.
It constitutes a first conversion mechanism that converts the linear motion of the racked shaft 6 into the rotational motion of a pinion 11110 in a direction perpendicular to the axis of the boring arbor 1. 11 is a ball bearing that rotatably supports the pinion shaft 10.

As shown in FIG. 2, on the outside of the boring arbor 1, tool rest bodies 14a and 14b are attached via a key 12 and a tool rest main body tightening bolt 13, which can be attached and detached by dividing into upper and lower parts.

A turret support 15 is attached to the turret main body 14a, and a turret base 17 is fixed to the upper part of the turret support 15 with a nut 18.
14b, the tool rest base 17°, and the tool rest support 15 constitute a tool rest that rotates with the rotation of the boring arbor 1.

The tool rest support 15 is configured such that the distance between the tool rest main body 14a and the tool rest base 17 is adjusted according to the size of the inner diameter of the casing 3, and the tool rest support 15 is fixed with a bolt 16.

A gear device related to a second conversion mechanism that transmits the axial rotation of the pinion shaft 10 in the right angle direction is installed on the tool post base 17.

Details of the second conversion mechanism are shown in Figure 3.4.6 In Figures 3 and 4, 19 is a worm shaft coaxial with the pinion shaft 10 in the first conversion mechanism, and 22 is This is a worm that is fitted onto the worm shaft 19 via a key 21. 23 is a worm wheel that meshes with the worm 22 and transmits the rotation of the worm shaft 19 in the right angle direction;
The worm wheel 23 is fitted onto a worm wheel shaft 25a via a key 24.

The worm shaft 19 and the worm wheel shaft 25a are provided with worm bearings 26 and 27 and a worm wheel bearing 28.2, respectively.
A gear device related to the second conversion mechanism is configured to be rotatably built into the gear box 20 via the gearbox 9 .

25 is a cutting tool holder formed on the same axis as the worm wheel shaft 25a, and the cutting tool holder 25 has a square hole 30.
is provided, and the cutting tool 32 is attached by the tool mounting bolt 31.
is now installed.

Next, an intermediate shaft connecting the pinion shaft 10 in the first conversion mechanism and the worm shaft 19 of the gear device related to the second conversion mechanism will be explained with reference to FIG.

33 is a rotating shaft directly connected to the pinion shaft 11, 34 is a universal joint related to the shaft coupling, 35 is a spline shaft, 36 is a spline bearing, and 37 is a spline nut tube, and the spline shaft 35 and the spline nut tube 37 are connected to each other. A desired shaft length can be adjusted via a spline bearing 36. In this way, the rotating shaft 33. The spline shaft 35 and the spline nut cylinder 37 constitute an intermediate shaft whose shaft length can be adjusted.
, the spline shaft 35 and the worm shaft 19 are connected by a universal joint 34, respectively.

Next, the operation of the curved surface cutting device configured as described above will be explained.

After setting the distance from the center of rotation of the cutting tool holder 25 to the tip of the cutting tool 32 to be equal to the radius R of the curved surface to be cut, rotate the hollow shaft 2 of the side boring machine. By rotating the boring arbor 1 directly connected to the turret main bodies 14a, 14b and the turret support 15. mounted on the outside of the boring arbor 1.
Turret base and gearbox 20. Bit holder 2
5 to cut the inner diameter of the casing 3, which is the workpiece.

At the same time, the shaft 6 with a rack directly connected to the main shaft 5 is moved in the axial direction of the main shaft 5 of the side boring machine, so that the shaft 6 with a rack that is directly connected to the main shaft 5 is continuously moved in a direction perpendicular to the fineness of the boring arbor 1 meshed with the rack 7. A pinion shaft 10 having an axial center is rotated.

The rotation of the pinion shaft 10 is performed by a rotating shaft 33, a universal joint 34, a spline nut cylinder 37°, a spline bearing 36, a spline shaft 35. universal joint 3
4 in conjunction with each other to transmit rotation, further impart rotation to the worm 22 via the worm shaft 19, and impart rotation to the worm foil 23 that meshes with the worm 22 at right angles, and this worm foil 23 is fitted. As the tool holder 25 formed on the shaft rotates, the cutting edge of the tool 32 rotates around the axis of the tool holder 25, and the cutting edge of the tool 32 rotates around the axis of the tool holder 25. ) can be processed using mechanical feed.

In addition, the length of the turret support 15 and the spline shaft 3
5 and the length of the hollow part of the spline nut cylinder 37, the tool post support can be tightened by operating the bolt 16 to adjust the position of the tool holder 25 according to the inner diameter of the casing 3. can do.

Conventionally, in general-purpose tank boring machines, boring arbor 1
Machining of large curved surfaces using a cutting tool is mostly done manually, using a cutting tool that is shaped each time, or by applying small amounts of axial and radial feed to the cutting tool. Processing was difficult and time-consuming work.

However, according to the curved surface cutting device of the present embodiment, a curved surface can be cut by simply moving the main shaft 5 of the horizontal boring machine in the axial direction, so that it is not only easy to operate and obtain an accurate machined surface. This has the effect of significantly shortening processing time.

Although the above embodiments have been described with reference to a general-purpose tank boring machine, the present invention can also be applied to other machine tools, such as universal machine tools with equivalent functions, to the extent that similar effects can be expected. It is applicable.

Furthermore, the shapes and mechanisms of each part explained in the above embodiments are not limited to those shown in FIGS. 1 to 4. For example, the first conversion mechanism is.

Although we have explained the meshing between the rack and pinion of the shaft with a rack, the linear movement of the main shaft in the axial direction is
Other means may be used as long as they can be converted into rotational motion perpendicular to the axis.

Similarly, the second conversion mechanism has been described as an example of a gear device using meshing of a worm and a worm wheel, but other means may be used as long as the input rotation can be converted and output in the right angle direction. .

Further, the adjustment of the distance between the boring arbor axis and the tool holder is not limited to the means shown in 2'g1.

〔Effect of the invention〕

As described above, according to the present invention, when cutting a curved surface with a large radius using a boring arbor with a machine tool, especially a general-purpose boring machine, it is possible to cut a curved surface with a large radius by simply moving the main shaft of the horizontal boring machine in the axial direction. It is possible to provide a curved surface cutting device that can accurately process a curved surface portion and significantly shorten the processing time.

[Brief explanation of drawings]

1 is a schematic configuration diagram of a curved surface cutting device according to an embodiment of the present invention, FIG. 2 is a partially sectional side view showing the main parts of the device in FIG. 1, and FIG. 3 is a gear wheel thereof. Plane sectional view of the device section, 4th
The figure is a side sectional view thereof. 1... Boring arbor, 2... Hollow shaft, 5...
・Main shaft. 6... Shaft with rack, 7... Rack, 10.
...Pinion shaft, 14A, 14B...Turret main body, 1
5...Turret support, 17...Turret base, 1
9... Worm shaft, 20... Gear box, 22...
...Warm. 23... Worm foil, 25a... Worm foil shaft, 25... Bit holder, 32... Bit, 3
3... Rotating shaft, 34... Universal joint,
35...Spline shaft, 36...Spline bearing,
37...Spline nut tube. fJ+ Figure ¥r, z Figure

Claims (1)

[Scope of Claims] 1. A hollow shaft-shaped boring arbor directly connected to a hollow shaft around the main axis of a machine tool, and a tool rest that is removably attached to the outside of the boring arbor and rotates with the rotation of the boring arbor. , an axial feed shaft of the main spindle that is directly connected to the main spindle of the machine tool and is slidably mounted inside the hollow shaft-shaped boring arbor; a first conversion mechanism for converting the rotational movement in the turret into an axial rotation perpendicular to the rotational movement within the tool rest;
a second conversion mechanism that transmits the rotation converted by the conversion mechanism in the right angle direction; an intermediate shaft that connects the first conversion mechanism and the second conversion mechanism; and a rotation that is converted by the second conversion mechanism. It consists of a tool holder formed on a rotating shaft and a tool attached to the tool holder, and by axial movement of the main shaft of the machine tool, the tool holder on the tool rest installed via the boring arbor is moved. A curved surface cutting device characterized in that it is configured to rotate. 2. In the device described in claim 1, the first converting mechanism includes a shaft with a rack related to an axial feed shaft directly connected to the main axis of the machine tool, and a shaft that engages with the rack to convert linear movement of the rack into rotational movement. A curved surface cutting device that consists of a gear shaft that converts into 3. In the device described in claim 1, the second conversion mechanism includes a worm shaft and a worm wheel shaft connected to the intermediate shaft, and the rotation of the worm shaft is controlled by the meshing of the worm and the worm wheel. A curved surface cutting device, wherein the gear device transmits data orthogonally to the worm wheel shaft, and a cutting tool holder is formed on the worm wheel shaft. 4. In any of claims 1 to 3, the tool rest includes a tool rest main body attached to the outer periphery of the boring arbor and housing the first conversion mechanism, and a second conversion mechanism. A curved surface cutting device comprising a turret base on which the gearbox is placed and fixed, and a turret support capable of adjusting the distance between the turret main body and the turret base. 5. In any one of claims 1 to 4, the intermediate shaft connects the sprite shaft portion and the spline nut cylindrical portion so that the shaft length can be adjusted. A curved surface cutting device configured to be connected to a gear shaft of a first conversion mechanism and a worm shaft of a second conversion mechanism.